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third-party-mirror/openjdk/jdk25u/HEAD/./src/hotspot/share/classfile/classFileParser.cpp
blob: 5e28f3ec641abc5f7711268563fa80ce4e8905e6 [file]
/*
* Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "cds/cdsConfig.hpp"
#include "classfile/classFileParser.hpp"
#include "classfile/classFileStream.hpp"
#include "classfile/classLoader.hpp"
#include "classfile/classLoaderData.inline.hpp"
#include "classfile/classLoadInfo.hpp"
#include "classfile/defaultMethods.hpp"
#include "classfile/fieldLayoutBuilder.hpp"
#include "classfile/javaClasses.inline.hpp"
#include "classfile/moduleEntry.hpp"
#include "classfile/packageEntry.hpp"
#include "classfile/symbolTable.hpp"
#include "classfile/systemDictionary.hpp"
#include "classfile/verificationType.hpp"
#include "classfile/verifier.hpp"
#include "classfile/vmClasses.hpp"
#include "classfile/vmSymbols.hpp"
#include "jvm.h"
#include "logging/log.hpp"
#include "logging/logStream.hpp"
#include "memory/allocation.hpp"
#include "memory/metadataFactory.hpp"
#include "memory/oopFactory.hpp"
#include "memory/resourceArea.hpp"
#include "memory/universe.hpp"
#include "oops/annotations.hpp"
#include "oops/constantPool.inline.hpp"
#include "oops/fieldInfo.hpp"
#include "oops/fieldStreams.inline.hpp"
#include "oops/instanceKlass.inline.hpp"
#include "oops/instanceMirrorKlass.hpp"
#include "oops/klass.inline.hpp"
#include "oops/klassVtable.hpp"
#include "oops/metadata.hpp"
#include "oops/method.inline.hpp"
#include "oops/oop.inline.hpp"
#include "oops/recordComponent.hpp"
#include "oops/symbol.hpp"
#include "prims/jvmtiExport.hpp"
#include "prims/jvmtiThreadState.hpp"
#include "runtime/arguments.hpp"
#include "runtime/fieldDescriptor.inline.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/javaCalls.hpp"
#include "runtime/os.hpp"
#include "runtime/perfData.hpp"
#include "runtime/reflection.hpp"
#include "runtime/safepointVerifiers.hpp"
#include "runtime/signature.hpp"
#include "runtime/timer.hpp"
#include "services/classLoadingService.hpp"
#include "services/threadService.hpp"
#include "utilities/align.hpp"
#include "utilities/bitMap.inline.hpp"
#include "utilities/checkedCast.hpp"
#include "utilities/copy.hpp"
#include "utilities/formatBuffer.hpp"
#include "utilities/exceptions.hpp"
#include "utilities/globalDefinitions.hpp"
#include "utilities/growableArray.hpp"
#include "utilities/macros.hpp"
#include "utilities/ostream.hpp"
#include "utilities/resourceHash.hpp"
#include "utilities/utf8.hpp"
#if INCLUDE_CDS
#include "classfile/systemDictionaryShared.hpp"
#endif
#if INCLUDE_JFR
#include "jfr/support/jfrTraceIdExtension.hpp"
#endif
// We generally try to create the oops directly when parsing, rather than
// allocating temporary data structures and copying the bytes twice. A
// temporary area is only needed when parsing utf8 entries in the constant
// pool and when parsing line number tables.
// We add assert in debug mode when class format is not checked.
#define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
#define JAVA_MIN_SUPPORTED_VERSION 45
#define JAVA_PREVIEW_MINOR_VERSION 65535
// Used for two backward compatibility reasons:
// - to check for new additions to the class file format in JDK1.5
// - to check for bug fixes in the format checker in JDK1.5
#define JAVA_1_5_VERSION 49
// Used for backward compatibility reasons:
// - to check for javac bug fixes that happened after 1.5
// - also used as the max version when running in jdk6
#define JAVA_6_VERSION 50
// Used for backward compatibility reasons:
// - to disallow argument and require ACC_STATIC for <clinit> methods
#define JAVA_7_VERSION 51
// Extension method support.
#define JAVA_8_VERSION 52
#define JAVA_9_VERSION 53
#define JAVA_10_VERSION 54
#define JAVA_11_VERSION 55
#define JAVA_12_VERSION 56
#define JAVA_13_VERSION 57
#define JAVA_14_VERSION 58
#define JAVA_15_VERSION 59
#define JAVA_16_VERSION 60
#define JAVA_17_VERSION 61
#define JAVA_18_VERSION 62
#define JAVA_19_VERSION 63
#define JAVA_20_VERSION 64
#define JAVA_21_VERSION 65
#define JAVA_22_VERSION 66
#define JAVA_23_VERSION 67
#define JAVA_24_VERSION 68
#define JAVA_25_VERSION 69
void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
assert((bad_constant == JVM_CONSTANT_Module ||
bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
"Unexpected bad constant pool entry");
if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
}
void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
ConstantPool* cp,
const int length,
TRAPS) {
assert(stream != nullptr, "invariant");
assert(cp != nullptr, "invariant");
// Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
// this function (_current can be allocated in a register, with scalar
// replacement of aggregates). The _current pointer is copied back to
// stream() when this function returns. DON'T call another method within
// this method that uses stream().
const ClassFileStream cfs1 = *stream;
const ClassFileStream* const cfs = &cfs1;
DEBUG_ONLY(const u1* const old_current = stream->current();)
// Used for batching symbol allocations.
const char* names[SymbolTable::symbol_alloc_batch_size];
int lengths[SymbolTable::symbol_alloc_batch_size];
int indices[SymbolTable::symbol_alloc_batch_size];
unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
int names_count = 0;
// parsing Index 0 is unused
for (int index = 1; index < length; index++) {
// Each of the following case guarantees one more byte in the stream
// for the following tag or the access_flags following constant pool,
// so we don't need bounds-check for reading tag.
const u1 tag = cfs->get_u1_fast();
switch (tag) {
case JVM_CONSTANT_Class : {
cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
const u2 name_index = cfs->get_u2_fast();
cp->klass_index_at_put(index, name_index);
break;
}
case JVM_CONSTANT_Fieldref: {
cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
const u2 class_index = cfs->get_u2_fast();
const u2 name_and_type_index = cfs->get_u2_fast();
cp->field_at_put(index, class_index, name_and_type_index);
break;
}
case JVM_CONSTANT_Methodref: {
cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
const u2 class_index = cfs->get_u2_fast();
const u2 name_and_type_index = cfs->get_u2_fast();
cp->method_at_put(index, class_index, name_and_type_index);
break;
}
case JVM_CONSTANT_InterfaceMethodref: {
cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
const u2 class_index = cfs->get_u2_fast();
const u2 name_and_type_index = cfs->get_u2_fast();
cp->interface_method_at_put(index, class_index, name_and_type_index);
break;
}
case JVM_CONSTANT_String : {
cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
const u2 string_index = cfs->get_u2_fast();
cp->string_index_at_put(index, string_index);
break;
}
case JVM_CONSTANT_MethodHandle :
case JVM_CONSTANT_MethodType: {
if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
classfile_parse_error(
"Class file version does not support constant tag %u in class file %s",
tag, THREAD);
return;
}
if (tag == JVM_CONSTANT_MethodHandle) {
cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
const u1 ref_kind = cfs->get_u1_fast();
const u2 method_index = cfs->get_u2_fast();
cp->method_handle_index_at_put(index, ref_kind, method_index);
}
else if (tag == JVM_CONSTANT_MethodType) {
cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
const u2 signature_index = cfs->get_u2_fast();
cp->method_type_index_at_put(index, signature_index);
}
else {
ShouldNotReachHere();
}
break;
}
case JVM_CONSTANT_Dynamic : {
if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
classfile_parse_error(
"Class file version does not support constant tag %u in class file %s",
tag, THREAD);
return;
}
cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
const u2 bootstrap_specifier_index = cfs->get_u2_fast();
const u2 name_and_type_index = cfs->get_u2_fast();
if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
_max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
}
cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
break;
}
case JVM_CONSTANT_InvokeDynamic : {
if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
classfile_parse_error(
"Class file version does not support constant tag %u in class file %s",
tag, THREAD);
return;
}
cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
const u2 bootstrap_specifier_index = cfs->get_u2_fast();
const u2 name_and_type_index = cfs->get_u2_fast();
if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
_max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
}
cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
break;
}
case JVM_CONSTANT_Integer: {
cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
const u4 bytes = cfs->get_u4_fast();
cp->int_at_put(index, (jint)bytes);
break;
}
case JVM_CONSTANT_Float: {
cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
const u4 bytes = cfs->get_u4_fast();
cp->float_at_put(index, *(jfloat*)&bytes);
break;
}
case JVM_CONSTANT_Long: {
// A mangled type might cause you to overrun allocated memory
guarantee_property(index + 1 < length,
"Invalid constant pool entry %u in class file %s",
index,
CHECK);
cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
const u8 bytes = cfs->get_u8_fast();
cp->long_at_put(index, bytes);
index++; // Skip entry following eigth-byte constant, see JVM book p. 98
break;
}
case JVM_CONSTANT_Double: {
// A mangled type might cause you to overrun allocated memory
guarantee_property(index+1 < length,
"Invalid constant pool entry %u in class file %s",
index,
CHECK);
cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
const u8 bytes = cfs->get_u8_fast();
cp->double_at_put(index, *(jdouble*)&bytes);
index++; // Skip entry following eigth-byte constant, see JVM book p. 98
break;
}
case JVM_CONSTANT_NameAndType: {
cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
const u2 name_index = cfs->get_u2_fast();
const u2 signature_index = cfs->get_u2_fast();
cp->name_and_type_at_put(index, name_index, signature_index);
break;
}
case JVM_CONSTANT_Utf8 : {
cfs->guarantee_more(2, CHECK); // utf8_length
u2 utf8_length = cfs->get_u2_fast();
const u1* utf8_buffer = cfs->current();
assert(utf8_buffer != nullptr, "null utf8 buffer");
// Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
cfs->skip_u1_fast(utf8_length);
// Before storing the symbol, make sure it's legal
if (_need_verify) {
verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
}
unsigned int hash;
Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
utf8_length,
hash);
if (result == nullptr) {
names[names_count] = (const char*)utf8_buffer;
lengths[names_count] = utf8_length;
indices[names_count] = index;
hashValues[names_count++] = hash;
if (names_count == SymbolTable::symbol_alloc_batch_size) {
SymbolTable::new_symbols(_loader_data,
constantPoolHandle(THREAD, cp),
names_count,
names,
lengths,
indices,
hashValues);
names_count = 0;
}
} else {
cp->symbol_at_put(index, result);
}
break;
}
case JVM_CONSTANT_Module:
case JVM_CONSTANT_Package: {
// Record that an error occurred in these two cases but keep parsing so
// that ACC_Module can be checked for in the access_flags. Need to
// throw NoClassDefFoundError in that case.
if (_major_version >= JAVA_9_VERSION) {
cfs->guarantee_more(3, CHECK);
cfs->get_u2_fast();
set_class_bad_constant_seen(tag);
break;
}
}
default: {
classfile_parse_error("Unknown constant tag %u in class file %s",
tag,
THREAD);
return;
}
} // end of switch(tag)
} // end of for
// Allocate the remaining symbols
if (names_count > 0) {
SymbolTable::new_symbols(_loader_data,
constantPoolHandle(THREAD, cp),
names_count,
names,
lengths,
indices,
hashValues);
}
// Copy _current pointer of local copy back to stream.
assert(stream->current() == old_current, "non-exclusive use of stream");
stream->set_current(cfs1.current());
}
static inline bool valid_cp_range(int index, int length) {
return (index > 0 && index < length);
}
static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
assert(cp != nullptr, "invariant");
if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
return cp->symbol_at(index);
}
return nullptr;
}
void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
ConstantPool* const cp,
const int length,
TRAPS) {
assert(cp != nullptr, "invariant");
assert(stream != nullptr, "invariant");
// parsing constant pool entries
parse_constant_pool_entries(stream, cp, length, CHECK);
if (class_bad_constant_seen() != 0) {
// a bad CP entry has been detected previously so stop parsing and just return.
return;
}
int index = 1; // declared outside of loops for portability
int num_klasses = 0;
// first verification pass - validate cross references
// and fixup class and string constants
for (index = 1; index < length; index++) { // Index 0 is unused
const jbyte tag = cp->tag_at(index).value();
switch (tag) {
case JVM_CONSTANT_Class: {
ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
break;
}
case JVM_CONSTANT_Fieldref:
// fall through
case JVM_CONSTANT_Methodref:
// fall through
case JVM_CONSTANT_InterfaceMethodref: {
if (!_need_verify) break;
const int klass_ref_index = cp->uncached_klass_ref_index_at(index);
const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(index);
guarantee_property(valid_klass_reference_at(klass_ref_index),
"Invalid constant pool index %u in class file %s",
klass_ref_index, CHECK);
guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
cp->tag_at(name_and_type_ref_index).is_name_and_type(),
"Invalid constant pool index %u in class file %s",
name_and_type_ref_index, CHECK);
break;
}
case JVM_CONSTANT_String: {
ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
break;
}
case JVM_CONSTANT_Integer:
break;
case JVM_CONSTANT_Float:
break;
case JVM_CONSTANT_Long:
case JVM_CONSTANT_Double: {
index++;
guarantee_property(
(index < length && cp->tag_at(index).is_invalid()),
"Improper constant pool long/double index %u in class file %s",
index, CHECK);
break;
}
case JVM_CONSTANT_NameAndType: {
if (!_need_verify) break;
const int name_ref_index = cp->name_ref_index_at(index);
const int signature_ref_index = cp->signature_ref_index_at(index);
guarantee_property(valid_symbol_at(name_ref_index),
"Invalid constant pool index %u in class file %s",
name_ref_index, CHECK);
guarantee_property(valid_symbol_at(signature_ref_index),
"Invalid constant pool index %u in class file %s",
signature_ref_index, CHECK);
break;
}
case JVM_CONSTANT_Utf8:
break;
case JVM_CONSTANT_UnresolvedClass: // fall-through
case JVM_CONSTANT_UnresolvedClassInError: {
ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
break;
}
case JVM_CONSTANT_ClassIndex: {
const int class_index = cp->klass_index_at(index);
guarantee_property(valid_symbol_at(class_index),
"Invalid constant pool index %u in class file %s",
class_index, CHECK);
cp->unresolved_klass_at_put(index, class_index, num_klasses++);
break;
}
case JVM_CONSTANT_StringIndex: {
const int string_index = cp->string_index_at(index);
guarantee_property(valid_symbol_at(string_index),
"Invalid constant pool index %u in class file %s",
string_index, CHECK);
Symbol* const sym = cp->symbol_at(string_index);
cp->unresolved_string_at_put(index, sym);
break;
}
case JVM_CONSTANT_MethodHandle: {
const int ref_index = cp->method_handle_index_at(index);
guarantee_property(valid_cp_range(ref_index, length),
"Invalid constant pool index %u in class file %s",
ref_index, CHECK);
const constantTag tag = cp->tag_at(ref_index);
const int ref_kind = cp->method_handle_ref_kind_at(index);
switch (ref_kind) {
case JVM_REF_getField:
case JVM_REF_getStatic:
case JVM_REF_putField:
case JVM_REF_putStatic: {
guarantee_property(
tag.is_field(),
"Invalid constant pool index %u in class file %s (not a field)",
ref_index, CHECK);
break;
}
case JVM_REF_invokeVirtual:
case JVM_REF_newInvokeSpecial: {
guarantee_property(
tag.is_method(),
"Invalid constant pool index %u in class file %s (not a method)",
ref_index, CHECK);
break;
}
case JVM_REF_invokeStatic:
case JVM_REF_invokeSpecial: {
guarantee_property(
tag.is_method() ||
((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
"Invalid constant pool index %u in class file %s (not a method)",
ref_index, CHECK);
break;
}
case JVM_REF_invokeInterface: {
guarantee_property(
tag.is_interface_method(),
"Invalid constant pool index %u in class file %s (not an interface method)",
ref_index, CHECK);
break;
}
default: {
classfile_parse_error(
"Bad method handle kind at constant pool index %u in class file %s",
index, THREAD);
return;
}
} // switch(refkind)
// Keep the ref_index unchanged. It will be indirected at link-time.
break;
} // case MethodHandle
case JVM_CONSTANT_MethodType: {
const int ref_index = cp->method_type_index_at(index);
guarantee_property(valid_symbol_at(ref_index),
"Invalid constant pool index %u in class file %s",
ref_index, CHECK);
break;
}
case JVM_CONSTANT_Dynamic: {
const int name_and_type_ref_index =
cp->bootstrap_name_and_type_ref_index_at(index);
guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
cp->tag_at(name_and_type_ref_index).is_name_and_type(),
"Invalid constant pool index %u in class file %s",
name_and_type_ref_index, CHECK);
// bootstrap specifier index must be checked later,
// when BootstrapMethods attr is available
// Mark the constant pool as having a CONSTANT_Dynamic_info structure
cp->set_has_dynamic_constant();
break;
}
case JVM_CONSTANT_InvokeDynamic: {
const int name_and_type_ref_index =
cp->bootstrap_name_and_type_ref_index_at(index);
guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
cp->tag_at(name_and_type_ref_index).is_name_and_type(),
"Invalid constant pool index %u in class file %s",
name_and_type_ref_index, CHECK);
// bootstrap specifier index must be checked later,
// when BootstrapMethods attr is available
break;
}
default: {
fatal("bad constant pool tag value %u", cp->tag_at(index).value());
ShouldNotReachHere();
break;
}
} // switch(tag)
} // end of for
cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK);
if (!_need_verify) {
return;
}
// second verification pass - checks the strings are of the right format.
// but not yet to the other entries
for (index = 1; index < length; index++) {
const jbyte tag = cp->tag_at(index).value();
switch (tag) {
case JVM_CONSTANT_UnresolvedClass: {
const Symbol* const class_name = cp->klass_name_at(index);
// check the name
verify_legal_class_name(class_name, CHECK);
break;
}
case JVM_CONSTANT_NameAndType: {
if (_need_verify) {
const int sig_index = cp->signature_ref_index_at(index);
const int name_index = cp->name_ref_index_at(index);
const Symbol* const name = cp->symbol_at(name_index);
const Symbol* const sig = cp->symbol_at(sig_index);
guarantee_property(sig->utf8_length() != 0,
"Illegal zero length constant pool entry at %d in class %s",
sig_index, CHECK);
guarantee_property(name->utf8_length() != 0,
"Illegal zero length constant pool entry at %d in class %s",
name_index, CHECK);
if (Signature::is_method(sig)) {
// Format check method name and signature
verify_legal_method_name(name, CHECK);
verify_legal_method_signature(name, sig, CHECK);
} else {
// Format check field name and signature
verify_legal_field_name(name, CHECK);
verify_legal_field_signature(name, sig, CHECK);
}
}
break;
}
case JVM_CONSTANT_Dynamic: {
const int name_and_type_ref_index =
cp->uncached_name_and_type_ref_index_at(index);
// already verified to be utf8
const int name_ref_index =
cp->name_ref_index_at(name_and_type_ref_index);
// already verified to be utf8
const int signature_ref_index =
cp->signature_ref_index_at(name_and_type_ref_index);
const Symbol* const name = cp->symbol_at(name_ref_index);
const Symbol* const signature = cp->symbol_at(signature_ref_index);
if (_need_verify) {
// CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
// Need only to be sure signature is the right type.
if (Signature::is_method(signature)) {
throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
}
}
break;
}
case JVM_CONSTANT_InvokeDynamic:
case JVM_CONSTANT_Fieldref:
case JVM_CONSTANT_Methodref:
case JVM_CONSTANT_InterfaceMethodref: {
const int name_and_type_ref_index =
cp->uncached_name_and_type_ref_index_at(index);
// already verified to be utf8
const int name_ref_index =
cp->name_ref_index_at(name_and_type_ref_index);
// already verified to be utf8
const int signature_ref_index =
cp->signature_ref_index_at(name_and_type_ref_index);
const Symbol* const name = cp->symbol_at(name_ref_index);
const Symbol* const signature = cp->symbol_at(signature_ref_index);
if (tag == JVM_CONSTANT_Fieldref) {
if (_need_verify) {
// Field name and signature are verified above, when iterating NameAndType_info.
// Need only to be sure signature is non-zero length and the right type.
if (Signature::is_method(signature)) {
throwIllegalSignature("Field", name, signature, CHECK);
}
}
} else {
if (_need_verify) {
// Method name and signature are individually verified above, when iterating
// NameAndType_info. Need to check here that signature is non-zero length and
// the right type.
if (!Signature::is_method(signature)) {
throwIllegalSignature("Method", name, signature, CHECK);
}
}
// If a class method name begins with '<', it must be "<init>" and have void signature.
const unsigned int name_len = name->utf8_length();
if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
if (name != vmSymbols::object_initializer_name()) {
classfile_parse_error(
"Bad method name at constant pool index %u in class file %s",
name_ref_index, THREAD);
return;
} else if (!Signature::is_void_method(signature)) { // must have void signature.
throwIllegalSignature("Method", name, signature, CHECK);
}
}
}
break;
}
case JVM_CONSTANT_MethodHandle: {
const int ref_index = cp->method_handle_index_at(index);
const int ref_kind = cp->method_handle_ref_kind_at(index);
switch (ref_kind) {
case JVM_REF_invokeVirtual:
case JVM_REF_invokeStatic:
case JVM_REF_invokeSpecial:
case JVM_REF_newInvokeSpecial: {
const int name_and_type_ref_index =
cp->uncached_name_and_type_ref_index_at(ref_index);
const int name_ref_index =
cp->name_ref_index_at(name_and_type_ref_index);
const Symbol* const name = cp->symbol_at(name_ref_index);
if (ref_kind == JVM_REF_newInvokeSpecial) {
if (name != vmSymbols::object_initializer_name()) {
classfile_parse_error(
"Bad constructor name at constant pool index %u in class file %s",
name_ref_index, THREAD);
return;
}
} else {
if (name == vmSymbols::object_initializer_name()) {
classfile_parse_error(
"Bad method name at constant pool index %u in class file %s",
name_ref_index, THREAD);
return;
}
}
break;
}
// Other ref_kinds are already fully checked in previous pass.
} // switch(ref_kind)
break;
}
case JVM_CONSTANT_MethodType: {
const Symbol* const no_name = vmSymbols::type_name(); // place holder
const Symbol* const signature = cp->method_type_signature_at(index);
verify_legal_method_signature(no_name, signature, CHECK);
break;
}
case JVM_CONSTANT_Utf8: {
assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
}
} // switch(tag)
} // end of for
}
class NameSigHash: public ResourceObj {
public:
const Symbol* _name; // name
const Symbol* _sig; // signature
static const int HASH_ROW_SIZE = 256;
NameSigHash(Symbol* name, Symbol* sig) :
_name(name),
_sig(sig) {}
static unsigned int hash(NameSigHash const& namesig) {
return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
}
static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
return (e0._name == e1._name) &&
(e0._sig == e1._sig);
}
};
using NameSigHashtable = ResourceHashtable<NameSigHash, int,
NameSigHash::HASH_ROW_SIZE,
AnyObj::RESOURCE_AREA, mtInternal,
&NameSigHash::hash, &NameSigHash::equals>;
// Side-effects: populates the _local_interfaces field
void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
const int itfs_len,
ConstantPool* const cp,
bool* const has_nonstatic_concrete_methods,
TRAPS) {
assert(stream != nullptr, "invariant");
assert(cp != nullptr, "invariant");
assert(has_nonstatic_concrete_methods != nullptr, "invariant");
if (itfs_len == 0) {
_local_interfaces = Universe::the_empty_instance_klass_array();
} else {
assert(itfs_len > 0, "only called for len>0");
_local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
int index;
for (index = 0; index < itfs_len; index++) {
const u2 interface_index = stream->get_u2(CHECK);
Klass* interf;
guarantee_property(
valid_klass_reference_at(interface_index),
"Interface name has bad constant pool index %u in class file %s",
interface_index, CHECK);
if (cp->tag_at(interface_index).is_klass()) {
interf = cp->resolved_klass_at(interface_index);
} else {
Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
// Don't need to check legal name because it's checked when parsing constant pool.
// But need to make sure it's not an array type.
guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
"Bad interface name in class file %s", CHECK);
// Call resolve on the interface class name with class circularity checking
interf = SystemDictionary::resolve_super_or_fail(_class_name,
unresolved_klass,
Handle(THREAD, _loader_data->class_loader()),
false, CHECK);
}
if (!interf->is_interface()) {
THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
err_msg("class %s can not implement %s, because it is not an interface (%s)",
_class_name->as_klass_external_name(),
interf->external_name(),
interf->class_in_module_of_loader()));
}
if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
*has_nonstatic_concrete_methods = true;
}
_local_interfaces->at_put(index, InstanceKlass::cast(interf));
}
if (!_need_verify || itfs_len <= 1) {
return;
}
// Check if there's any duplicates in interfaces
ResourceMark rm(THREAD);
// Set containing interface names
ResourceHashtable<Symbol*, int>* interface_names = new ResourceHashtable<Symbol*, int>();
for (index = 0; index < itfs_len; index++) {
const InstanceKlass* const k = _local_interfaces->at(index);
Symbol* interface_name = k->name();
// If no duplicates, add (name, nullptr) in hashtable interface_names.
if (!interface_names->put(interface_name, 0)) {
classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
interface_name->as_C_string(), THREAD);
return;
}
}
}
}
void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
int constantvalue_index,
int signature_index,
TRAPS) const {
// Make sure the constant pool entry is of a type appropriate to this field
guarantee_property(
(constantvalue_index > 0 &&
constantvalue_index < cp->length()),
"Bad initial value index %u in ConstantValue attribute in class file %s",
constantvalue_index, CHECK);
const constantTag value_type = cp->tag_at(constantvalue_index);
switch(cp->basic_type_for_signature_at(signature_index)) {
case T_LONG: {
guarantee_property(value_type.is_long(),
"Inconsistent constant value type in class file %s",
CHECK);
break;
}
case T_FLOAT: {
guarantee_property(value_type.is_float(),
"Inconsistent constant value type in class file %s",
CHECK);
break;
}
case T_DOUBLE: {
guarantee_property(value_type.is_double(),
"Inconsistent constant value type in class file %s",
CHECK);
break;
}
case T_BYTE:
case T_CHAR:
case T_SHORT:
case T_BOOLEAN:
case T_INT: {
guarantee_property(value_type.is_int(),
"Inconsistent constant value type in class file %s",
CHECK);
break;
}
case T_OBJECT: {
guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
&& value_type.is_string()),
"Bad string initial value in class file %s",
CHECK);
break;
}
default: {
classfile_parse_error("Unable to set initial value %u in class file %s",
constantvalue_index,
THREAD);
}
}
}
class AnnotationCollector : public ResourceObj{
public:
enum Location { _in_field, _in_method, _in_class };
enum ID {
_unknown = 0,
_method_CallerSensitive,
_method_ForceInline,
_method_DontInline,
_method_ChangesCurrentThread,
_method_JvmtiHideEvents,
_method_JvmtiMountTransition,
_method_InjectedProfile,
_method_LambdaForm_Compiled,
_method_Hidden,
_method_Scoped,
_method_IntrinsicCandidate,
_jdk_internal_vm_annotation_Contended,
_field_Stable,
_jdk_internal_vm_annotation_ReservedStackAccess,
_jdk_internal_ValueBased,
_java_lang_Deprecated,
_java_lang_Deprecated_for_removal,
_annotation_LIMIT
};
const Location _location;
int _annotations_present;
u2 _contended_group;
AnnotationCollector(Location location)
: _location(location), _annotations_present(0), _contended_group(0)
{
assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
}
// If this annotation name has an ID, report it (or _none).
ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
// Set the annotation name:
void set_annotation(ID id) {
assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
_annotations_present |= (int)nth_bit((int)id);
}
void remove_annotation(ID id) {
assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
_annotations_present &= (int)~nth_bit((int)id);
}
// Report if the annotation is present.
bool has_any_annotations() const { return _annotations_present != 0; }
bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
void set_contended_group(u2 group) { _contended_group = group; }
u2 contended_group() const { return _contended_group; }
bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
void set_stable(bool stable) { set_annotation(_field_Stable); }
bool is_stable() const { return has_annotation(_field_Stable); }
};
// This class also doubles as a holder for metadata cleanup.
class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
private:
ClassLoaderData* _loader_data;
AnnotationArray* _field_annotations;
AnnotationArray* _field_type_annotations;
public:
FieldAnnotationCollector(ClassLoaderData* loader_data) :
AnnotationCollector(_in_field),
_loader_data(loader_data),
_field_annotations(nullptr),
_field_type_annotations(nullptr) {}
~FieldAnnotationCollector();
void apply_to(FieldInfo* f);
AnnotationArray* field_annotations() { return _field_annotations; }
AnnotationArray* field_type_annotations() { return _field_type_annotations; }
void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
};
class MethodAnnotationCollector : public AnnotationCollector{
public:
MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
void apply_to(const methodHandle& m);
};
class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
public:
ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
void apply_to(InstanceKlass* ik);
};
static int skip_annotation_value(const u1*, int, int); // fwd decl
// Safely increment index by val if does not pass limit
#define SAFE_ADD(index, limit, val) \
if (index >= limit - val) return limit; \
index += val;
// Skip an annotation. Return >=limit if there is any problem.
static int skip_annotation(const u1* buffer, int limit, int index) {
assert(buffer != nullptr, "invariant");
// annotation := atype:u2 do(nmem:u2) {member:u2 value}
// value := switch (tag:u1) { ... }
SAFE_ADD(index, limit, 4); // skip atype and read nmem
int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
while (--nmem >= 0 && index < limit) {
SAFE_ADD(index, limit, 2); // skip member
index = skip_annotation_value(buffer, limit, index);
}
return index;
}
// Skip an annotation value. Return >=limit if there is any problem.
static int skip_annotation_value(const u1* buffer, int limit, int index) {
assert(buffer != nullptr, "invariant");
// value := switch (tag:u1) {
// case B, C, I, S, Z, D, F, J, c: con:u2;
// case e: e_class:u2 e_name:u2;
// case s: s_con:u2;
// case [: do(nval:u2) {value};
// case @: annotation;
// case s: s_con:u2;
// }
SAFE_ADD(index, limit, 1); // read tag
const u1 tag = buffer[index - 1];
switch (tag) {
case 'B':
case 'C':
case 'I':
case 'S':
case 'Z':
case 'D':
case 'F':
case 'J':
case 'c':
case 's':
SAFE_ADD(index, limit, 2); // skip con or s_con
break;
case 'e':
SAFE_ADD(index, limit, 4); // skip e_class, e_name
break;
case '[':
{
SAFE_ADD(index, limit, 2); // read nval
int nval = Bytes::get_Java_u2((address)buffer + index - 2);
while (--nval >= 0 && index < limit) {
index = skip_annotation_value(buffer, limit, index);
}
}
break;
case '@':
index = skip_annotation(buffer, limit, index);
break;
default:
return limit; // bad tag byte
}
return index;
}
// Sift through annotations, looking for those significant to the VM:
static void parse_annotations(const ConstantPool* const cp,
const u1* buffer, int limit,
AnnotationCollector* coll,
ClassLoaderData* loader_data,
const bool can_access_vm_annotations) {
assert(cp != nullptr, "invariant");
assert(buffer != nullptr, "invariant");
assert(coll != nullptr, "invariant");
assert(loader_data != nullptr, "invariant");
// annotations := do(nann:u2) {annotation}
int index = 2; // read nann
if (index >= limit) return;
int nann = Bytes::get_Java_u2((address)buffer + index - 2);
enum { // initial annotation layout
atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
count_off = 2, // u2 such as 1 (one value)
member_off = 4, // utf8 such as 'value'
tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
e_tag_val = 'e',
e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
e_size = 11, // end of 'e' annotation
c_tag_val = 'c', // payload is type
c_con_off = 7, // utf8 payload, such as 'I'
c_size = 9, // end of 'c' annotation
s_tag_val = 's', // payload is String
s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
s_size = 9,
b_tag_val = 'Z', // payload is boolean
min_size = 6 // smallest possible size (zero members)
};
// Cannot add min_size to index in case of overflow MAX_INT
while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
int index0 = index;
index = skip_annotation(buffer, limit, index);
const u1* const abase = buffer + index0;
const int atype = Bytes::get_Java_u2((address)abase + atype_off);
const int count = Bytes::get_Java_u2((address)abase + count_off);
const Symbol* const aname = check_symbol_at(cp, atype);
if (aname == nullptr) break; // invalid annotation name
const Symbol* member = nullptr;
if (count >= 1) {
const int member_index = Bytes::get_Java_u2((address)abase + member_off);
member = check_symbol_at(cp, member_index);
if (member == nullptr) break; // invalid member name
}
// Here is where parsing particular annotations will take place.
AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations);
if (AnnotationCollector::_unknown == id) continue;
coll->set_annotation(id);
if (AnnotationCollector::_java_lang_Deprecated == id) {
// @Deprecated can specify forRemoval=true, which we need
// to record for JFR to use. If the annotation is not well-formed
// then we may not be able to determine that.
const u1* offset = abase + member_off;
// There are only 2 members in @Deprecated.
int n_members = MIN2(count, 2);
for (int i = 0; i < n_members; ++i) {
int member_index = Bytes::get_Java_u2((address)offset);
offset += 2;
member = check_symbol_at(cp, member_index);
if (member == vmSymbols::since() &&
(*((address)offset) == s_tag_val)) {
// Found `since` first so skip over it
offset += 3;
}
else if (member == vmSymbols::for_removal() &&
(*((address)offset) == b_tag_val)) {
const u2 boolean_value_index = Bytes::get_Java_u2((address)offset + 1);
// No guarantee the entry is valid so check it refers to an int in the CP.
if (cp->is_within_bounds(boolean_value_index) &&
cp->tag_at(boolean_value_index).is_int() &&
cp->int_at(boolean_value_index) == 1) {
// forRemoval == true
coll->set_annotation(AnnotationCollector::_java_lang_Deprecated_for_removal);
}
break; // no need to check further
}
else {
// This @Deprecated annotation is malformed so we don't try to
// determine whether forRemoval is set.
break;
}
}
continue; // proceed to next annotation
}
if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
// @Contended can optionally specify the contention group.
//
// Contended group defines the equivalence class over the fields:
// the fields within the same contended group are not treated distinct.
// The only exception is default group, which does not incur the
// equivalence. Naturally, contention group for classes is meaningless.
//
// While the contention group is specified as String, annotation
// values are already interned, and we might as well use the constant
// pool index as the group tag.
//
u2 group_index = 0; // default contended group
if (count == 1
&& s_size == (index - index0) // match size
&& s_tag_val == *(abase + tag_off)
&& member == vmSymbols::value_name()) {
group_index = Bytes::get_Java_u2((address)abase + s_con_off);
// No guarantee the group_index is valid so check it refers to a
// symbol in the CP.
if (cp->is_within_bounds(group_index) &&
cp->tag_at(group_index).is_utf8()) {
// Seems valid, so check for empty string and reset
if (cp->symbol_at(group_index)->utf8_length() == 0) {
group_index = 0; // default contended group
}
} else {
// Not valid so use the default
group_index = 0;
}
}
coll->set_contended_group(group_index);
continue; // proceed to next annotation
}
}
}
// Parse attributes for a field.
void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
u2 attributes_count,
bool is_static, u2 signature_index,
u2* const constantvalue_index_addr,
bool* const is_synthetic_addr,
u2* const generic_signature_index_addr,
ClassFileParser::FieldAnnotationCollector* parsed_annotations,
TRAPS) {
assert(cfs != nullptr, "invariant");
assert(constantvalue_index_addr != nullptr, "invariant");
assert(is_synthetic_addr != nullptr, "invariant");
assert(generic_signature_index_addr != nullptr, "invariant");
assert(parsed_annotations != nullptr, "invariant");
assert(attributes_count > 0, "attributes_count should be greater than 0");
u2 constantvalue_index = 0;
u2 generic_signature_index = 0;
bool is_synthetic = false;
const u1* runtime_visible_annotations = nullptr;
int runtime_visible_annotations_length = 0;
const u1* runtime_visible_type_annotations = nullptr;
int runtime_visible_type_annotations_length = 0;
bool runtime_invisible_annotations_exists = false;
bool runtime_invisible_type_annotations_exists = false;
const ConstantPool* const cp = _cp;
while (attributes_count--) {
cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
const u2 attribute_name_index = cfs->get_u2_fast();
const u4 attribute_length = cfs->get_u4_fast();
guarantee_property(valid_symbol_at(attribute_name_index),
"Invalid field attribute index %u in class file %s",
attribute_name_index,
CHECK);
const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
// ignore if non-static
if (constantvalue_index != 0) {
classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD);
return;
}
guarantee_property(
attribute_length == 2,
"Invalid ConstantValue field attribute length %u in class file %s",
attribute_length, CHECK);
constantvalue_index = cfs->get_u2(CHECK);
if (_need_verify) {
verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
}
} else if (attribute_name == vmSymbols::tag_synthetic()) {
if (attribute_length != 0) {
classfile_parse_error(
"Invalid Synthetic field attribute length %u in class file %s",
attribute_length, THREAD);
return;
}
is_synthetic = true;
} else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
if (attribute_length != 0) {
classfile_parse_error(
"Invalid Deprecated field attribute length %u in class file %s",
attribute_length, THREAD);
return;
}
} else if (_major_version >= JAVA_1_5_VERSION) {
if (attribute_name == vmSymbols::tag_signature()) {
if (generic_signature_index != 0) {
classfile_parse_error(
"Multiple Signature attributes for field in class file %s", THREAD);
return;
}
if (attribute_length != 2) {
classfile_parse_error(
"Wrong size %u for field's Signature attribute in class file %s",
attribute_length, THREAD);
return;
}
generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
} else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
if (runtime_visible_annotations != nullptr) {
classfile_parse_error(
"Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD);
return;
}
runtime_visible_annotations_length = attribute_length;
runtime_visible_annotations = cfs->current();
assert(runtime_visible_annotations != nullptr, "null visible annotations");
cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
parse_annotations(cp,
runtime_visible_annotations,
runtime_visible_annotations_length,
parsed_annotations,
_loader_data,
_can_access_vm_annotations);
cfs->skip_u1_fast(runtime_visible_annotations_length);
} else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
if (runtime_invisible_annotations_exists) {
classfile_parse_error(
"Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD);
return;
}
runtime_invisible_annotations_exists = true;
cfs->skip_u1(attribute_length, CHECK);
} else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
if (runtime_visible_type_annotations != nullptr) {
classfile_parse_error(
"Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD);
return;
}
runtime_visible_type_annotations_length = attribute_length;
runtime_visible_type_annotations = cfs->current();
assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
} else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
if (runtime_invisible_type_annotations_exists) {
classfile_parse_error(
"Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD);
return;
} else {
runtime_invisible_type_annotations_exists = true;
}
cfs->skip_u1(attribute_length, CHECK);
} else {
cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
}
} else {
cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
}
}
*constantvalue_index_addr = constantvalue_index;
*is_synthetic_addr = is_synthetic;
*generic_signature_index_addr = generic_signature_index;
AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
runtime_visible_annotations_length,
CHECK);
parsed_annotations->set_field_annotations(a);
a = allocate_annotations(runtime_visible_type_annotations,
runtime_visible_type_annotations_length,
CHECK);
parsed_annotations->set_field_type_annotations(a);
return;
}
// Side-effects: populates the _fields, _fields_annotations,
// _fields_type_annotations fields
void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
bool is_interface,
ConstantPool* cp,
const int cp_size,
u2* const java_fields_count_ptr,
TRAPS) {
assert(cfs != nullptr, "invariant");
assert(cp != nullptr, "invariant");
assert(java_fields_count_ptr != nullptr, "invariant");
assert(nullptr == _fields_annotations, "invariant");
assert(nullptr == _fields_type_annotations, "invariant");
cfs->guarantee_more(2, CHECK); // length
const u2 length = cfs->get_u2_fast();
*java_fields_count_ptr = length;
int num_injected = 0;
const InjectedField* const injected = JavaClasses::get_injected(_class_name,
&num_injected);
const int total_fields = length + num_injected;
// Allocate a temporary resource array to collect field data.
// After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
_temp_field_info = new GrowableArray<FieldInfo>(total_fields);
ResourceMark rm(THREAD);
for (int n = 0; n < length; n++) {
// access_flags, name_index, descriptor_index, attributes_count
cfs->guarantee_more(8, CHECK);
AccessFlags access_flags;
const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
verify_legal_field_modifiers(flags, is_interface, CHECK);
access_flags.set_flags(flags);
FieldInfo::FieldFlags fieldFlags(0);
const u2 name_index = cfs->get_u2_fast();
guarantee_property(valid_symbol_at(name_index),
"Invalid constant pool index %u for field name in class file %s",
name_index, CHECK);
const Symbol* const name = cp->symbol_at(name_index);
verify_legal_field_name(name, CHECK);
const u2 signature_index = cfs->get_u2_fast();
guarantee_property(valid_symbol_at(signature_index),
"Invalid constant pool index %u for field signature in class file %s",
signature_index, CHECK);
const Symbol* const sig = cp->symbol_at(signature_index);
verify_legal_field_signature(name, sig, CHECK);
u2 constantvalue_index = 0;
bool is_synthetic = false;
u2 generic_signature_index = 0;
const bool is_static = access_flags.is_static();
FieldAnnotationCollector parsed_annotations(_loader_data);
const u2 attributes_count = cfs->get_u2_fast();
if (attributes_count > 0) {
parse_field_attributes(cfs,
attributes_count,
is_static,
signature_index,
&constantvalue_index,
&is_synthetic,
&generic_signature_index,
&parsed_annotations,
CHECK);
if (parsed_annotations.field_annotations() != nullptr) {
if (_fields_annotations == nullptr) {
_fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
_loader_data, length, nullptr,
CHECK);
}
_fields_annotations->at_put(n, parsed_annotations.field_annotations());
parsed_annotations.set_field_annotations(nullptr);
}
if (parsed_annotations.field_type_annotations() != nullptr) {
if (_fields_type_annotations == nullptr) {
_fields_type_annotations =
MetadataFactory::new_array<AnnotationArray*>(_loader_data,
length,
nullptr,
CHECK);
}
_fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
parsed_annotations.set_field_type_annotations(nullptr);
}
if (is_synthetic) {
access_flags.set_is_synthetic();
}
if (generic_signature_index != 0) {
fieldFlags.update_generic(true);
}
}
const BasicType type = cp->basic_type_for_signature_at(signature_index);
// Update number of static oop fields.
if (is_static && is_reference_type(type)) {
_static_oop_count++;
}
FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
fi.set_index(n);
if (fieldFlags.is_generic()) {
fi.set_generic_signature_index(generic_signature_index);
}
parsed_annotations.apply_to(&fi);
if (fi.field_flags().is_contended()) {
_has_contended_fields = true;
}
_temp_field_info->append(fi);
}
assert(_temp_field_info->length() == length, "Must be");
int index = length;
if (num_injected != 0) {
for (int n = 0; n < num_injected; n++) {
// Check for duplicates
if (injected[n].may_be_java) {
const Symbol* const name = injected[n].name();
const Symbol* const signature = injected[n].signature();
bool duplicate = false;
for (int i = 0; i < length; i++) {
const FieldInfo* const f = _temp_field_info->adr_at(i);
if (name == cp->symbol_at(f->name_index()) &&
signature == cp->symbol_at(f->signature_index())) {
// Symbol is desclared in Java so skip this one
duplicate = true;
break;
}
}
if (duplicate) {
// These will be removed from the field array at the end
continue;
}
}
// Injected field
FieldInfo::FieldFlags fflags(0);
fflags.update_injected(true);
AccessFlags aflags;
FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
fi.set_index(index);
_temp_field_info->append(fi);
index++;
}
}
assert(_temp_field_info->length() == index, "Must be");
if (_need_verify && length > 1) {
// Check duplicated fields
ResourceMark rm(THREAD);
// Set containing name-signature pairs
NameSigHashtable* names_and_sigs = new NameSigHashtable();
for (int i = 0; i < _temp_field_info->length(); i++) {
NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
_temp_field_info->adr_at(i)->signature(_cp));
// If no duplicates, add name/signature in hashtable names_and_sigs.
if(!names_and_sigs->put(name_and_sig, 0)) {
classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
return;
}
}
}
}
const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
u4 code_length,
u4 exception_table_length,
TRAPS) {
assert(cfs != nullptr, "invariant");
const unsafe_u2* const exception_table_start = cfs->current();
assert(exception_table_start != nullptr, "null exception table");
cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
// end_pc,
// handler_pc,
// catch_type_index
// Will check legal target after parsing code array in verifier.
if (_need_verify) {
for (unsigned int i = 0; i < exception_table_length; i++) {
const u2 start_pc = cfs->get_u2_fast();
const u2 end_pc = cfs->get_u2_fast();
const u2 handler_pc = cfs->get_u2_fast();
const u2 catch_type_index = cfs->get_u2_fast();
guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
"Illegal exception table range in class file %s",
CHECK_NULL);
guarantee_property(handler_pc < code_length,
"Illegal exception table handler in class file %s",
CHECK_NULL);
if (catch_type_index != 0) {
guarantee_property(valid_klass_reference_at(catch_type_index),
"Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
}
}
} else {
cfs->skip_u2_fast(exception_table_length * 4);
}
return exception_table_start;
}
void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
u4 code_length,
CompressedLineNumberWriteStream**const write_stream,
TRAPS) {
const ClassFileStream* const cfs = _stream;
unsigned int num_entries = cfs->get_u2(CHECK);
// Each entry is a u2 start_pc, and a u2 line_number
const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
// Verify line number attribute and table length
guarantee_property(
code_attribute_length == sizeof(u2) + length_in_bytes,
"LineNumberTable attribute has wrong length in class file %s", CHECK);
cfs->guarantee_more(length_in_bytes, CHECK);
if ((*write_stream) == nullptr) {
if (length_in_bytes > fixed_buffer_size) {
(*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
} else {
(*write_stream) = new CompressedLineNumberWriteStream(
_linenumbertable_buffer, fixed_buffer_size);
}
}
while (num_entries-- > 0) {
const u2 bci = cfs->get_u2_fast(); // start_pc
const u2 line = cfs->get_u2_fast(); // line_number
guarantee_property(bci < code_length,
"Invalid pc in LineNumberTable in class file %s", CHECK);
(*write_stream)->write_pair(bci, line);
}
}
class LVT_Hash : public AllStatic {
public:
static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
/*
* 3-tuple start_bci/length/slot has to be unique key,
* so the following comparison seems to be redundant:
* && elem->name_cp_index == entry->_elem->name_cp_index
*/
return (e0.start_bci == e1.start_bci &&
e0.length == e1.length &&
e0.name_cp_index == e1.name_cp_index &&
e0.slot == e1.slot);
}
static unsigned int hash(LocalVariableTableElement const& e0) {
unsigned int raw_hash = e0.start_bci;
raw_hash = e0.length + raw_hash * 37;
raw_hash = e0.name_cp_index + raw_hash * 37;
raw_hash = e0.slot + raw_hash * 37;
return raw_hash;
}
};
// Class file LocalVariableTable elements.
class Classfile_LVT_Element {
public:
u2 start_bci;
u2 length;
u2 name_cp_index;
u2 descriptor_cp_index;
u2 slot;
};
static void copy_lvt_element(const Classfile_LVT_Element* const src,
LocalVariableTableElement* const lvt) {
lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
lvt->length = Bytes::get_Java_u2((u1*) &src->length);
lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
lvt->signature_cp_index = 0;
lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
}
// Function is used to parse both attributes:
// LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
u4 code_length,
u2 max_locals,
u4 code_attribute_length,
u2* const localvariable_table_length,
bool isLVTT,
TRAPS) {
const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
*localvariable_table_length = cfs->get_u2(CHECK_NULL);
const unsigned int size = checked_cast<unsigned>(
(*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2));
const ConstantPool* const cp = _cp;
// Verify local variable table attribute has right length
if (_need_verify) {
guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
"%s has wrong length in class file %s", tbl_name, CHECK_NULL);
}
const unsafe_u2* const localvariable_table_start = cfs->current();
assert(localvariable_table_start != nullptr, "null local variable table");
if (!_need_verify) {
cfs->skip_u2_fast(size);
} else {
cfs->guarantee_more(size * 2, CHECK_NULL);
for(int i = 0; i < (*localvariable_table_length); i++) {
const u2 start_pc = cfs->get_u2_fast();
const u2 length = cfs->get_u2_fast();
const u2 name_index = cfs->get_u2_fast();
const u2 descriptor_index = cfs->get_u2_fast();
const u2 index = cfs->get_u2_fast();
// Assign to a u4 to avoid overflow
const u4 end_pc = (u4)start_pc + (u4)length;
if (start_pc >= code_length) {
classfile_parse_error(
"Invalid start_pc %u in %s in class file %s",
start_pc, tbl_name, THREAD);
return nullptr;
}
if (end_pc > code_length) {
classfile_parse_error(
"Invalid length %u in %s in class file %s",
length, tbl_name, THREAD);
return nullptr;
}
const int cp_size = cp->length();
guarantee_property(valid_symbol_at(name_index),
"Name index %u in %s has bad constant type in class file %s",
name_index, tbl_name, CHECK_NULL);
guarantee_property(valid_symbol_at(descriptor_index),
"Signature index %u in %s has bad constant type in class file %s",
descriptor_index, tbl_name, CHECK_NULL);
const Symbol* const name = cp->symbol_at(name_index);
const Symbol* const sig = cp->symbol_at(descriptor_index);
verify_legal_field_name(name, CHECK_NULL);
u2 extra_slot = 0;
if (!isLVTT) {
verify_legal_field_signature(name, sig, CHECK_NULL);
// 4894874: check special cases for double and long local variables
if (sig == vmSymbols::type_signature(T_DOUBLE) ||
sig == vmSymbols::type_signature(T_LONG)) {
extra_slot = 1;
}
}
guarantee_property((index + extra_slot) < max_locals,
"Invalid index %u in %s in class file %s",
index, tbl_name, CHECK_NULL);
}
}
return localvariable_table_start;
}
static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
u4 code_attribute_length,
TRAPS) {
assert(cfs != nullptr, "invariant");
if (0 == code_attribute_length) {
return nullptr;
}
const u1* const stackmap_table_start = cfs->current();
assert(stackmap_table_start != nullptr, "null stackmap table");
// check code_attribute_length
cfs->skip_u1(code_attribute_length, CHECK_NULL);
return stackmap_table_start;
}
const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
u2* const checked_exceptions_length,
u4 method_attribute_length,
TRAPS) {
assert(cfs != nullptr, "invariant");
assert(checked_exceptions_length != nullptr, "invariant");
cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
*checked_exceptions_length = cfs->get_u2_fast();
const unsigned int size =
(*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
const unsafe_u2* const checked_exceptions_start = cfs->current();
assert(checked_exceptions_start != nullptr, "null checked exceptions");
if (!_need_verify) {
cfs->skip_u2_fast(size);
} else {
// Verify each value in the checked exception table
u2 checked_exception;
const u2 len = *checked_exceptions_length;
cfs->guarantee_more(2 * len, CHECK_NULL);
for (int i = 0; i < len; i++) {
checked_exception = cfs->get_u2_fast();
guarantee_property(
valid_klass_reference_at(checked_exception),
"Exception name has bad type at constant pool %u in class file %s",
checked_exception, CHECK_NULL);
}
}
// check exceptions attribute length
if (_need_verify) {
guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
sizeof(u2) * size),
"Exceptions attribute has wrong length in class file %s", CHECK_NULL);
}
return checked_exceptions_start;
}
void ClassFileParser::throwIllegalSignature(const char* type,
const Symbol* name,
const Symbol* sig,
TRAPS) const {
assert(name != nullptr, "invariant");
assert(sig != nullptr, "invariant");
ResourceMark rm(THREAD);
// Names are all known to be < 64k so we know this formatted message is not excessively large.
Exceptions::fthrow(THREAD_AND_LOCATION,
vmSymbols::java_lang_ClassFormatError(),
"%s \"%s\" in class %s has illegal signature \"%s\"", type,
name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
}
AnnotationCollector::ID
AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
const Symbol* name,
const bool can_access_vm_annotations) {
const vmSymbolID sid = vmSymbols::find_sid(name);
// Privileged code can use all annotations. Other code silently drops some.
const bool privileged = loader_data->is_boot_class_loader_data() ||
loader_data->is_platform_class_loader_data() ||
can_access_vm_annotations;
switch (sid) {
case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_CallerSensitive;
}
case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_ForceInline;
}
case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_DontInline;
}
case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): {
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_ChangesCurrentThread;
}
case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiHideEvents_signature): {
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_JvmtiHideEvents;
}
case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): {
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_JvmtiMountTransition;
}
case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_InjectedProfile;
}
case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_LambdaForm_Compiled;
}
case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_Hidden;
}
case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): {
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_Scoped;
}
case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): {
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_IntrinsicCandidate;
}
case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
if (_location != _in_field) break; // only allow for fields
if (!privileged) break; // only allow in privileged code
return _field_Stable;
}
case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
if (_location != _in_field && _location != _in_class) {
break; // only allow for fields and classes
}
if (!EnableContended || (RestrictContended && !privileged)) {
break; // honor privileges
}
return _jdk_internal_vm_annotation_Contended;
}
case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
if (_location != _in_method) break; // only allow for methods
if (RestrictReservedStack && !privileged) break; // honor privileges
return _jdk_internal_vm_annotation_ReservedStackAccess;
}
case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
if (_location != _in_class) break; // only allow for classes
if (!privileged) break; // only allow in privileged code
return _jdk_internal_ValueBased;
}
case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
return _java_lang_Deprecated;
}
default: {
break;
}
}
return AnnotationCollector::_unknown;
}
void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
if (is_contended())
// Setting the contended group also sets the contended bit in field flags
f->set_contended_group(contended_group());
if (is_stable())
(f->field_flags_addr())->update_stable(true);
}
ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
// If there's an error deallocate metadata for field annotations
MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
}
void MethodAnnotationCollector::apply_to(const methodHandle& m) {
if (has_annotation(_method_CallerSensitive))
m->set_caller_sensitive();
if (has_annotation(_method_ForceInline))
m->set_force_inline();
if (has_annotation(_method_DontInline))
m->set_dont_inline();
if (has_annotation(_method_ChangesCurrentThread))
m->set_changes_current_thread();
if (has_annotation(_method_JvmtiHideEvents))
m->set_jvmti_hide_events();
if (has_annotation(_method_JvmtiMountTransition))
m->set_jvmti_mount_transition();
if (has_annotation(_method_InjectedProfile))
m->set_has_injected_profile();
if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
if (has_annotation(_method_Hidden))
m->set_is_hidden();
if (has_annotation(_method_Scoped))
m->set_scoped();
if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic())
m->set_intrinsic_candidate();
if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
m->set_has_reserved_stack_access();
if (has_annotation(_java_lang_Deprecated))
m->set_deprecated();
if (has_annotation(_java_lang_Deprecated_for_removal))
m->set_deprecated_for_removal();
}
void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
assert(ik != nullptr, "invariant");
if (has_annotation(_jdk_internal_vm_annotation_Contended)) {
ik->set_is_contended(is_contended());
}
if (has_annotation(_jdk_internal_ValueBased)) {
ik->set_has_value_based_class_annotation();
if (DiagnoseSyncOnValueBasedClasses) {
ik->set_is_value_based();
}
}
if (has_annotation(_java_lang_Deprecated)) {
Array<Method*>* methods = ik->methods();
int length = ik->methods()->length();
for (int i = 0; i < length; i++) {
Method* m = methods->at(i);
m->set_deprecated();
}
}
if (has_annotation(_java_lang_Deprecated_for_removal)) {
Array<Method*>* methods = ik->methods();
int length = ik->methods()->length();
for (int i = 0; i < length; i++) {
Method* m = methods->at(i);
m->set_deprecated_for_removal();
}
}
}
#define MAX_ARGS_SIZE 255
#define MAX_CODE_SIZE 65535
#define INITIAL_MAX_LVT_NUMBER 256
/* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
*
* Rules for LVT's and LVTT's are:
* - There can be any number of LVT's and LVTT's.
* - If there are n LVT's, it is the same as if there was just
* one LVT containing all the entries from the n LVT's.
* - There may be no more than one LVT entry per local variable.
* Two LVT entries are 'equal' if these fields are the same:
* start_pc, length, name, slot
* - There may be no more than one LVTT entry per each LVT entry.
* Each LVTT entry has to match some LVT entry.
* - HotSpot internal LVT keeps natural ordering of class file LVT entries.
*/
void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
int lvt_cnt,
u2* const localvariable_table_length,
const unsafe_u2** const localvariable_table_start,
int lvtt_cnt,
u2* const localvariable_type_table_length,
const unsafe_u2** const localvariable_type_table_start,
TRAPS) {
ResourceMark rm(THREAD);
typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
256, AnyObj::RESOURCE_AREA, mtInternal,
&LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
LVT_HashTable* const table = new LVT_HashTable();
// To fill LocalVariableTable in
const Classfile_LVT_Element* cf_lvt;
LocalVariableTableElement* lvt = cm->localvariable_table_start();
for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
copy_lvt_element(&cf_lvt[idx], lvt);
// If no duplicates, add LVT elem in hashtable.
if (table->put(*lvt, lvt) == false
&& _need_verify
&& _major_version >= JAVA_1_5_VERSION) {
classfile_parse_error("Duplicated LocalVariableTable attribute "
"entry for '%s' in class file %s",
_cp->symbol_at(lvt->name_cp_index)->as_utf8(),
THREAD);
return;
}
}
}
// To merge LocalVariableTable and LocalVariableTypeTable
const Classfile_LVT_Element* cf_lvtt;
LocalVariableTableElement lvtt_elem;
for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
LocalVariableTableElement** entry = table->get(lvtt_elem);
if (entry == nullptr) {
if (_need_verify) {
classfile_parse_error("LVTT entry for '%s' in class file %s "
"does not match any LVT entry",
_cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
THREAD);
return;
}
} else if ((*entry)->signature_cp_index != 0 && _need_verify) {
classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
"entry for '%s' in class file %s",
_cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
THREAD);
return;
} else {
// to add generic signatures into LocalVariableTable
(*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
}
}
}
}
void ClassFileParser::copy_method_annotations(ConstMethod* cm,
const u1* runtime_visible_annotations,
int runtime_visible_annotations_length,
const u1* runtime_visible_parameter_annotations,
int runtime_visible_parameter_annotations_length,
const u1* runtime_visible_type_annotations,
int runtime_visible_type_annotations_length,
const u1* annotation_default,
int annotation_default_length,
TRAPS) {
AnnotationArray* a;
if (runtime_visible_annotations_length > 0) {
a = allocate_annotations(runtime_visible_annotations,
runtime_visible_annotations_length,
CHECK);
cm->set_method_annotations(a);
}
if (runtime_visible_parameter_annotations_length > 0) {
a = allocate_annotations(runtime_visible_parameter_annotations,
runtime_visible_parameter_annotations_length,
CHECK);
cm->set_parameter_annotations(a);
}
if (annotation_default_length > 0) {
a = allocate_annotations(annotation_default,
annotation_default_length,
CHECK);
cm->set_default_annotations(a);
}
if (runtime_visible_type_annotations_length > 0) {
a = allocate_annotations(runtime_visible_type_annotations,
runtime_visible_type_annotations_length,
CHECK);
cm->set_type_annotations(a);
}
}
// Note: the parse_method below is big and clunky because all parsing of the code and exceptions
// attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
// Method* to save footprint, so we only know the size of the resulting Method* when the
// entire method attribute is parsed.
//
// The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
bool is_interface,
const ConstantPool* cp,
bool* const has_localvariable_table,
TRAPS) {
assert(cfs != nullptr, "invariant");
assert(cp != nullptr, "invariant");
assert(has_localvariable_table != nullptr, "invariant");
ResourceMark rm(THREAD);
// Parse fixed parts:
// access_flags, name_index, descriptor_index, attributes_count
cfs->guarantee_more(8, CHECK_NULL);
u2 flags = cfs->get_u2_fast();
const u2 name_index = cfs->get_u2_fast();
const int cp_size = cp->length();
guarantee_property(
valid_symbol_at(name_index),
"Illegal constant pool index %u for method name in class file %s",
name_index, CHECK_NULL);
const Symbol* const name = cp->symbol_at(name_index);
verify_legal_method_name(name, CHECK_NULL);
const u2 signature_index = cfs->get_u2_fast();
guarantee_property(
valid_symbol_at(signature_index),
"Illegal constant pool index %u for method signature in class file %s",
signature_index, CHECK_NULL);
const Symbol* const signature = cp->symbol_at(signature_index);
if (name == vmSymbols::class_initializer_name()) {
// We ignore the other access flags for a valid class initializer.
// (JVM Spec 2nd ed., chapter 4.6)
if (_major_version < 51) { // backward compatibility
flags = JVM_ACC_STATIC;
} else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
} else {
classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
return nullptr;
}
} else {
verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
}
if (name == vmSymbols::object_initializer_name() && is_interface) {
classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
return nullptr;
}
int args_size = -1; // only used when _need_verify is true
if (_need_verify) {
verify_legal_name_with_signature(name, signature, CHECK_NULL);
args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
verify_legal_method_signature(name, signature, CHECK_NULL);
if (args_size > MAX_ARGS_SIZE) {
classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
return nullptr;
}
}
AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
// Default values for code and exceptions attribute elements
u2 max_stack = 0;
u2 max_locals = 0;
u4 code_length = 0;
const u1* code_start = nullptr;
u2 exception_table_length = 0;
const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
Array<int>* exception_handlers = Universe::the_empty_int_array();
u2 checked_exceptions_length = 0;
const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
CompressedLineNumberWriteStream* linenumber_table = nullptr;
int linenumber_table_length = 0;
int total_lvt_length = 0;
u2 lvt_cnt = 0;
u2 lvtt_cnt = 0;
bool lvt_allocated = false;
u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
u2* localvariable_table_length = nullptr;
const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes
u2* localvariable_type_table_length = nullptr;
const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes
int method_parameters_length = -1;
const u1* method_parameters_data = nullptr;
bool method_parameters_seen = false;
bool parsed_code_attribute = false;
bool parsed_checked_exceptions_attribute = false;
bool parsed_stackmap_attribute = false;
// stackmap attribute - JDK1.5
const u1* stackmap_data = nullptr;
int stackmap_data_length = 0;
u2 generic_signature_index = 0;
MethodAnnotationCollector parsed_annotations;
const u1* runtime_visible_annotations = nullptr;
int runtime_visible_annotations_length = 0;
const u1* runtime_visible_parameter_annotations = nullptr;
int runtime_visible_parameter_annotations_length = 0;
const u1* runtime_visible_type_annotations = nullptr;
int runtime_visible_type_annotations_length = 0;
bool runtime_invisible_annotations_exists = false;
bool runtime_invisible_type_annotations_exists = false;
bool runtime_invisible_parameter_annotations_exists = false;
const u1* annotation_default = nullptr;
int annotation_default_length = 0;
// Parse code and exceptions attribute
u2 method_attributes_count = cfs->get_u2_fast();
while (method_attributes_count--) {
cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
const u2 method_attribute_name_index = cfs->get_u2_fast();
const u4 method_attribute_length = cfs->get_u4_fast();
guarantee_property(
valid_symbol_at(method_attribute_name_index),
"Invalid method attribute name index %u in class file %s",
method_attribute_name_index, CHECK_NULL);
const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
if (method_attribute_name == vmSymbols::tag_code()) {
// Parse Code attribute
if (_need_verify) {
guarantee_property(
!access_flags.is_native() && !access_flags.is_abstract(),
"Code attribute in native or abstract methods in class file %s",
CHECK_NULL);
}
if (parsed_code_attribute) {
classfile_parse_error("Multiple Code attributes in class file %s",
THREAD);
return nullptr;
}
parsed_code_attribute = true;
// Stack size, locals size, and code size
cfs->guarantee_more(8, CHECK_NULL);
max_stack = cfs->get_u2_fast();
max_locals = cfs->get_u2_fast();
code_length = cfs->get_u4_fast();
if (_need_verify) {
guarantee_property(args_size <= max_locals,
"Arguments can't fit into locals in class file %s",
CHECK_NULL);
guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
"Invalid method Code length %u in class file %s",
code_length, CHECK_NULL);
}
// Code pointer
code_start = cfs->current();
assert(code_start != nullptr, "null code start");
cfs->guarantee_more(code_length, CHECK_NULL);
cfs->skip_u1_fast(code_length);
// Exception handler table
cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
exception_table_length = cfs->get_u2_fast();
if (exception_table_length > 0) {
exception_table_start = parse_exception_table(cfs,
code_length,
exception_table_length,
CHECK_NULL);
}
// Parse additional attributes in code attribute
cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
u2 code_attributes_count = cfs->get_u2_fast();
unsigned int calculated_attribute_length = 0;
calculated_attribute_length =
sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
calculated_attribute_length += checked_cast<unsigned int>(
code_length +
sizeof(exception_table_length) +
sizeof(code_attributes_count) +
exception_table_length *
( sizeof(u2) + // start_pc
sizeof(u2) + // end_pc
sizeof(u2) + // handler_pc
sizeof(u2) )); // catch_type_index
while (code_attributes_count--) {
cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
const u2 code_attribute_name_index = cfs->get_u2_fast();
const u4 code_attribute_length = cfs->get_u4_fast();
calculated_attribute_length += code_attribute_length +
(unsigned)sizeof(code_attribute_name_index) +
(unsigned)sizeof(code_attribute_length);
guarantee_property(valid_symbol_at(code_attribute_name_index),
"Invalid code attribute name index %u in class file %s",
code_attribute_name_index,
CHECK_NULL);
if (LoadLineNumberTables &&
cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
// Parse and compress line number table
parse_linenumber_table(code_attribute_length,
code_length,
&linenumber_table,
CHECK_NULL);
} else if (LoadLocalVariableTables &&
cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
// Parse local variable table
if (!lvt_allocated) {
localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, u2, INITIAL_MAX_LVT_NUMBER);
localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, u2, INITIAL_MAX_LVT_NUMBER);
localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
lvt_allocated = true;
}
if (lvt_cnt == max_lvt_cnt) {
max_lvt_cnt <<= 1;
localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
}
localvariable_table_start[lvt_cnt] =
parse_localvariable_table(cfs,
code_length,
max_locals,
code_attribute_length,
&localvariable_table_length[lvt_cnt],
false, // is not LVTT
CHECK_NULL);
total_lvt_length += localvariable_table_length[lvt_cnt];
lvt_cnt++;
} else if (LoadLocalVariableTypeTables &&
_major_version >= JAVA_1_5_VERSION &&
cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
if (!lvt_allocated) {
localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, u2, INITIAL_MAX_LVT_NUMBER);
localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, u2, INITIAL_MAX_LVT_NUMBER);
localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
lvt_allocated = true;
}
// Parse local variable type table
if (lvtt_cnt == max_lvtt_cnt) {
max_lvtt_cnt <<= 1;
localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
}
localvariable_type_table_start[lvtt_cnt] =
parse_localvariable_table(cfs,
code_length,
max_locals,
code_attribute_length,
&localvariable_type_table_length[lvtt_cnt],
true, // is LVTT
CHECK_NULL);
lvtt_cnt++;
} else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
// Stack map is only needed by the new verifier in JDK1.5.
if (parsed_stackmap_attribute) {
classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD);
return nullptr;
}
stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL);
stackmap_data_length = code_attribute_length;
parsed_stackmap_attribute = true;
} else {
// Skip unknown attributes
cfs->skip_u1(code_attribute_length, CHECK_NULL);
}
}
// check method attribute length
if (_need_verify) {
guarantee_property(method_attribute_length == calculated_attribute_length,
"Code segment has wrong length in class file %s",
CHECK_NULL);
}
} else if (method_attribute_name == vmSymbols::tag_exceptions()) {
// Parse Exceptions attribute
if (parsed_checked_exceptions_attribute) {
classfile_parse_error("Multiple Exceptions attributes in class file %s",
THREAD);
return nullptr;
}
parsed_checked_exceptions_attribute = true;
checked_exceptions_start =
parse_checked_exceptions(cfs,
&checked_exceptions_length,
method_attribute_length,
CHECK_NULL);
} else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
// reject multiple method parameters
if (method_parameters_seen) {
classfile_parse_error("Multiple MethodParameters attributes in class file %s",
THREAD);
return nullptr;
}
method_parameters_seen = true;
method_parameters_length = cfs->get_u1_fast();
const u4 real_length = (method_parameters_length * 4u) + 1u;
if (method_attribute_length != real_length) {
classfile_parse_error(
"Invalid MethodParameters method attribute length %u in class file",
method_attribute_length, THREAD);
return nullptr;
}
method_parameters_data = cfs->current();
cfs->skip_u2_fast(method_parameters_length);
cfs->skip_u2_fast(method_parameters_length);
// ignore this attribute if it cannot be reflected
if (!vmClasses::Parameter_klass_loaded())
method_parameters_length = -1;
} else if (method_attribute_name == vmSymbols::tag_synthetic()) {
if (method_attribute_length != 0) {
classfile_parse_error(
"Invalid Synthetic method attribute length %u in class file %s",
method_attribute_length, THREAD);
return nullptr;
}
// Should we check that there hasn't already been a synthetic attribute?
access_flags.set_is_synthetic();
} else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
if (method_attribute_length != 0) {
classfile_parse_error(
"Invalid Deprecated method attribute length %u in class file %s",
method_attribute_length, THREAD);
return nullptr;
}
} else if (_major_version >= JAVA_1_5_VERSION) {
if (method_attribute_name == vmSymbols::tag_signature()) {
if (generic_signature_index != 0) {
classfile_parse_error(
"Multiple Signature attributes for method in class file %s",
THREAD);
return nullptr;
}
if (method_attribute_length != 2) {
classfile_parse_error(
"Invalid Signature attribute length %u in class file %s",
method_attribute_length, THREAD);
return nullptr;
}
generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
} else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
if (runtime_visible_annotations != nullptr) {
classfile_parse_error(
"Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
THREAD);
return nullptr;
}
runtime_visible_annotations_length = method_attribute_length;
runtime_visible_annotations = cfs->current();
assert(runtime_visible_annotations != nullptr, "null visible annotations");
cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
parse_annotations(cp,
runtime_visible_annotations,
runtime_visible_annotations_length,
&parsed_annotations,
_loader_data,
_can_access_vm_annotations);
cfs->skip_u1_fast(runtime_visible_annotations_length);
} else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
if (runtime_invisible_annotations_exists) {
classfile_parse_error(
"Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
THREAD);
return nullptr;
}
runtime_invisible_annotations_exists = true;
cfs->skip_u1(method_attribute_length, CHECK_NULL);
} else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
if (runtime_visible_parameter_annotations != nullptr) {
classfile_parse_error(
"Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
THREAD);
return nullptr;
}
runtime_visible_parameter_annotations_length = method_attribute_length;
runtime_visible_parameter_annotations = cfs->current();
assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations");
cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
} else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
if (runtime_invisible_parameter_annotations_exists) {
classfile_parse_error(
"Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
THREAD);
return nullptr;
}
runtime_invisible_parameter_annotations_exists = true;
cfs->skip_u1(method_attribute_length, CHECK_NULL);
} else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
if (annotation_default != nullptr) {
classfile_parse_error(
"Multiple AnnotationDefault attributes for method in class file %s",
THREAD);
return nullptr;
}
annotation_default_length = method_attribute_length;
annotation_default = cfs->current();
assert(annotation_default != nullptr, "null annotation default");
cfs->skip_u1(annotation_default_length, CHECK_NULL);
} else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
if (runtime_visible_type_annotations != nullptr) {
classfile_parse_error(
"Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
THREAD);
return nullptr;
}
runtime_visible_type_annotations_length = method_attribute_length;
runtime_visible_type_annotations = cfs->current();
assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
// No need for the VM to parse Type annotations
cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
} else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
if (runtime_invisible_type_annotations_exists) {
classfile_parse_error(
"Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
THREAD);
return nullptr;
}
runtime_invisible_type_annotations_exists = true;
cfs->skip_u1(method_attribute_length, CHECK_NULL);
} else {
// Skip unknown attributes
cfs->skip_u1(method_attribute_length, CHECK_NULL);
}
} else {
// Skip unknown attributes
cfs->skip_u1(method_attribute_length, CHECK_NULL);
}
}
if (linenumber_table != nullptr) {
linenumber_table->write_terminator();
linenumber_table_length = linenumber_table->position();
}
// Make sure there's at least one Code attribute in non-native/non-abstract method
if (_need_verify) {
guarantee_property(access_flags.is_native() ||
access_flags.is_abstract() ||
parsed_code_attribute,
"Absent Code attribute in method that is not native or abstract in class file %s",
CHECK_NULL);
}
// All sizing information for a Method* is finally available, now create it
InlineTableSizes sizes(
total_lvt_length,
linenumber_table_length,
exception_table_length,
checked_exceptions_length,
method_parameters_length,
generic_signature_index,
runtime_visible_annotations_length,
runtime_visible_parameter_annotations_length,
runtime_visible_type_annotations_length,
annotation_default_length,
0);
Method* const m = Method::allocate(_loader_data,
code_length,
access_flags,
&sizes,
ConstMethod::NORMAL,
_cp->symbol_at(name_index),
CHECK_NULL);
ClassLoadingService::add_class_method_size(m->size()*wordSize);
// Fill in information from fixed part (access_flags already set)
m->set_constants(_cp);
m->set_name_index(name_index);
m->set_signature_index(signature_index);
m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static());
assert(args_size < 0 || args_size == m->size_of_parameters(), "");
// Fill in code attribute information
m->set_max_stack(max_stack);
m->set_max_locals(max_locals);
if (stackmap_data != nullptr) {
m->constMethod()->copy_stackmap_data(_loader_data,
(u1*)stackmap_data,
stackmap_data_length,
CHECK_NULL);
}
// Copy byte codes
m->set_code((u1*)code_start);
// Copy line number table
if (linenumber_table != nullptr) {
memcpy(m->compressed_linenumber_table(),
linenumber_table->buffer(),
linenumber_table_length);
}
// Copy exception table
if (exception_table_length > 0) {
Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
m->exception_table_start(),
exception_table_length * sizeof(ExceptionTableElement),
sizeof(u2));
}
// Copy method parameters
if (method_parameters_length > 0) {
MethodParametersElement* elem = m->constMethod()->method_parameters_start();
for (int i = 0; i < method_parameters_length; i++) {
elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
method_parameters_data += 2;
elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
method_parameters_data += 2;
}
}
// Copy checked exceptions
if (checked_exceptions_length > 0) {
Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
m->checked_exceptions_start(),
checked_exceptions_length * sizeof(CheckedExceptionElement),
sizeof(u2));
}
// Copy class file LVT's/LVTT's into the HotSpot internal LVT.
if (total_lvt_length > 0) {
*has_localvariable_table = true;
copy_localvariable_table(m->constMethod(),
lvt_cnt,
localvariable_table_length,
localvariable_table_start,
lvtt_cnt,
localvariable_type_table_length,
localvariable_type_table_start,
CHECK_NULL);
}
if (parsed_annotations.has_any_annotations())
parsed_annotations.apply_to(methodHandle(THREAD, m));
if (is_hidden()) { // Mark methods in hidden classes as 'hidden'.
m->set_is_hidden();
}
// Copy annotations
copy_method_annotations(m->constMethod(),
runtime_visible_annotations,
runtime_visible_annotations_length,
runtime_visible_parameter_annotations,
runtime_visible_parameter_annotations_length,
runtime_visible_type_annotations,
runtime_visible_type_annotations_length,
annotation_default,
annotation_default_length,
CHECK_NULL);
if (InstanceKlass::is_finalization_enabled() &&
name == vmSymbols::finalize_method_name() &&
signature == vmSymbols::void_method_signature()) {
if (m->is_empty_method()) {
_has_empty_finalizer = true;
} else {
_has_finalizer = true;
}
}
NOT_PRODUCT(m->verify());
return m;
}
// Side-effects: populates the _methods field in the parser
void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
bool is_interface,
bool* const has_localvariable_table,
bool* has_final_method,
bool* declares_nonstatic_concrete_methods,
TRAPS) {
assert(cfs != nullptr, "invariant");
assert(has_localvariable_table != nullptr, "invariant");
assert(has_final_method != nullptr, "invariant");
assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
assert(nullptr == _methods, "invariant");
cfs->guarantee_more(2, CHECK); // length
const u2 length = cfs->get_u2_fast();
if (length == 0) {
_methods = Universe::the_empty_method_array();
} else {
_methods = MetadataFactory::new_array<Method*>(_loader_data,
length,
nullptr,
CHECK);
for (int index = 0; index < length; index++) {
Method* method = parse_method(cfs,
is_interface,
_cp,
has_localvariable_table,
CHECK);
if (method->is_final()) {
*has_final_method = true;
}
// declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
// used for interface initialization, and default method inheritance analysis
if (is_interface && !(*declares_nonstatic_concrete_methods)
&& !method->is_abstract() && !method->is_static()) {
*declares_nonstatic_concrete_methods = true;
}
_methods->at_put(index, method);
}
if (_need_verify && length > 1) {
// Check duplicated methods
ResourceMark rm(THREAD);
// Set containing name-signature pairs
NameSigHashtable* names_and_sigs = new NameSigHashtable();
for (int i = 0; i < length; i++) {
const Method* const m = _methods->at(i);
NameSigHash name_and_sig(m->name(), m->signature());
// If no duplicates, add name/signature in hashtable names_and_sigs.
if(!names_and_sigs->put(name_and_sig, 0)) {
classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
return;
}
}
}
}
}
static const intArray* sort_methods(Array<Method*>* methods) {
const int length = methods->length();
// If JVMTI original method ordering or sharing is enabled we have to
// remember the original class file ordering.
// We temporarily use the vtable_index field in the Method* to store the
// class file index, so we can read in after calling qsort.
// Put the method ordering in the shared archive.
if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
for (int index = 0; index < length; index++) {
Method* const m = methods->at(index);
assert(!m->valid_vtable_index(), "vtable index should not be set");
m->set_vtable_index(index);
}
}
// Sort method array by ascending method name (for faster lookups & vtable construction)
// Note that the ordering is not alphabetical, see Symbol::fast_compare
Method::sort_methods(methods);
intArray* method_ordering = nullptr;
// If JVMTI original method ordering or sharing is enabled construct int
// array remembering the original ordering
if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
method_ordering = new intArray(length, length, -1);
for (int index = 0; index < length; index++) {
Method* const m = methods->at(index);
const int old_index = m->vtable_index();
assert(old_index >= 0 && old_index < length, "invalid method index");
method_ordering->at_put(index, old_index);
m->set_vtable_index(Method::invalid_vtable_index);
}
}
return method_ordering;
}
// Parse generic_signature attribute for methods and fields
u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
TRAPS) {
assert(cfs != nullptr, "invariant");
cfs->guarantee_more(2, CHECK_0); // generic_signature_index
const u2 generic_signature_index = cfs->get_u2_fast();
guarantee_property(
valid_symbol_at(generic_signature_index),
"Invalid Signature attribute at constant pool index %u in class file %s",
generic_signature_index, CHECK_0);
return generic_signature_index;
}
void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
TRAPS) {
assert(cfs != nullptr, "invariant");
cfs->guarantee_more(2, CHECK); // sourcefile_index
const u2 sourcefile_index = cfs->get_u2_fast();
guarantee_property(
valid_symbol_at(sourcefile_index),
"Invalid SourceFile attribute at constant pool index %u in class file %s",
sourcefile_index, CHECK);
set_class_sourcefile_index(sourcefile_index);
}
void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
int length,
TRAPS) {
assert(cfs != nullptr, "invariant");
const u1* const sde_buffer = cfs->current();
assert(sde_buffer != nullptr, "null sde buffer");
// Don't bother storing it if there is no way to retrieve it
if (JvmtiExport::can_get_source_debug_extension()) {
assert((length+1) > length, "Overflow checking");
u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
for (int i = 0; i < length; i++) {
sde[i] = sde_buffer[i];
}
sde[length] = '\0';
set_class_sde_buffer((const char*)sde, length);
}
// Got utf8 string, set stream position forward
cfs->skip_u1(length, CHECK);
}
// Inner classes can be static, private or protected (classic VM does this)
#define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
JVM_ACC_PRIVATE | \
JVM_ACC_PROTECTED | \
JVM_ACC_STATIC \
)
// Find index of the InnerClasses entry for the specified inner_class_info_index.
// Return -1 if none is found.
static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
Symbol* cp_klass_name = cp->klass_name_at(inner);
for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
if (cp->klass_name_at(idx_inner) == cp_klass_name) {
return idx;
}
}
return -1;
}
// Return the outer_class_info_index for the InnerClasses entry containing the
// specified inner_class_info_index. Return -1 if no InnerClasses entry is found.
static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
if (inner == 0) return -1;
int idx = inner_classes_find_index(inner_classes, inner, cp, length);
if (idx == -1) return -1;
int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
return result;
}
// Return true if circularity is found, false if no circularity is found.
// Use Floyd's cycle finding algorithm.
static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) {
int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
while (fast != -1 && fast != 0) {
if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) {
return true; // found a circularity
}
fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
if (fast == -1) return false;
fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
if (fast == -1) return false;
slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length);
assert(slow != -1, "sanity check");
}
return false;
}
// Loop through each InnerClasses entry checking for circularities and duplications
// with other entries. If duplicate entries are found then throw CFE. Otherwise,
// return true if a circularity or entries with duplicate inner_class_info_indexes
// are found.
bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) {
// Loop through each InnerClasses entry.
for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
// Return true if there are circular entries.
if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) {
return true;
}
// Check if there are duplicate entries or entries with the same inner_class_info_index.
for (int y = idx + InstanceKlass::inner_class_next_offset; y < length;
y += InstanceKlass::inner_class_next_offset) {
// 4347400: make sure there's no duplicate entry in the classes array
if (_major_version >= JAVA_1_5_VERSION) {
guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) ||
_inner_classes->at(idx+1) != _inner_classes->at(y+1) ||
_inner_classes->at(idx+2) != _inner_classes->at(y+2) ||
_inner_classes->at(idx+3) != _inner_classes->at(y+3)),
"Duplicate entry in InnerClasses attribute in class file %s",
CHECK_(true));
}
// Return true if there are two entries with the same inner_class_info_index.
if (_inner_classes->at(y) == _inner_classes->at(idx)) {
return true;
}
}
}
return false;
}
// Return number of classes in the inner classes attribute table
u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
const ConstantPool* cp,
const u1* const inner_classes_attribute_start,
bool parsed_enclosingmethod_attribute,
u2 enclosing_method_class_index,
u2 enclosing_method_method_index,
TRAPS) {
const u1* const current_mark = cfs->current();
u2 length = 0;
if (inner_classes_attribute_start != nullptr) {
cfs->set_current(inner_classes_attribute_start);
cfs->guarantee_more(2, CHECK_0); // length
length = cfs->get_u2_fast();
}
// 4-tuples of shorts of inner classes data and 2 shorts of enclosing
// method data:
// [inner_class_info_index,
// outer_class_info_index,
// inner_name_index,
// inner_class_access_flags,
// ...
// enclosing_method_class_index,
// enclosing_method_method_index]
const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
_inner_classes = inner_classes;
int index = 0;
cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
for (int n = 0; n < length; n++) {
// Inner class index
const u2 inner_class_info_index = cfs->get_u2_fast();
guarantee_property(
valid_klass_reference_at(inner_class_info_index),
"inner_class_info_index %u has bad constant type in class file %s",
inner_class_info_index, CHECK_0);
// Outer class index
const u2 outer_class_info_index = cfs->get_u2_fast();
guarantee_property(
outer_class_info_index == 0 ||
valid_klass_reference_at(outer_class_info_index),
"outer_class_info_index %u has bad constant type in class file %s",
outer_class_info_index, CHECK_0);
if (outer_class_info_index != 0) {
const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
char* bytes = (char*)outer_class_name->bytes();
guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
"Outer class is an array class in class file %s", CHECK_0);
}
// Inner class name
const u2 inner_name_index = cfs->get_u2_fast();
guarantee_property(
inner_name_index == 0 || valid_symbol_at(inner_name_index),
"inner_name_index %u has bad constant type in class file %s",
inner_name_index, CHECK_0);
if (_need_verify) {
guarantee_property(inner_class_info_index != outer_class_info_index,
"Class is both outer and inner class in class file %s", CHECK_0);
}
// Access flags
u2 flags;
// JVM_ACC_MODULE is defined in JDK-9 and later.
if (_major_version >= JAVA_9_VERSION) {
flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
} else {
flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
}
if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
// Set abstract bit for old class files for backward compatibility
flags |= JVM_ACC_ABSTRACT;
}
verify_legal_class_modifiers(flags, CHECK_0);
AccessFlags inner_access_flags(flags);
inner_classes->at_put(index++, inner_class_info_index);
inner_classes->at_put(index++, outer_class_info_index);
inner_classes->at_put(index++, inner_name_index);
inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
}
// Check for circular and duplicate entries.
bool has_circularity = false;
if (_need_verify) {
has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
if (has_circularity) {
// If circularity check failed then ignore InnerClasses attribute.
MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
index = 0;
if (parsed_enclosingmethod_attribute) {
inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
_inner_classes = inner_classes;
} else {
_inner_classes = Universe::the_empty_short_array();
}
}
}
// Set EnclosingMethod class and method indexes.
if (parsed_enclosingmethod_attribute) {
inner_classes->at_put(index++, enclosing_method_class_index);
inner_classes->at_put(index++, enclosing_method_method_index);
}
assert(index == size || has_circularity, "wrong size");
// Restore buffer's current position.
cfs->set_current(current_mark);
return length;
}
u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
const u1* const nest_members_attribute_start,
TRAPS) {
const u1* const current_mark = cfs->current();
u2 length = 0;
if (nest_members_attribute_start != nullptr) {
cfs->set_current(nest_members_attribute_start);
cfs->guarantee_more(2, CHECK_0); // length
length = cfs->get_u2_fast();
}
const int size = length;
Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
_nest_members = nest_members;
int index = 0;
cfs->guarantee_more(2 * length, CHECK_0);
for (int n = 0; n < length; n++) {
const u2 class_info_index = cfs->get_u2_fast();
guarantee_property(
valid_klass_reference_at(class_info_index),
"Nest member class_info_index %u has bad constant type in class file %s",
class_info_index, CHECK_0);
nest_members->at_put(index++, class_info_index);
}
assert(index == size, "wrong size");
// Restore buffer's current position.
cfs->set_current(current_mark);
return length;
}
u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
const u1* const permitted_subclasses_attribute_start,
TRAPS) {
const u1* const current_mark = cfs->current();
u2 length = 0;
if (permitted_subclasses_attribute_start != nullptr) {
cfs->set_current(permitted_subclasses_attribute_start);
cfs->guarantee_more(2, CHECK_0); // length
length = cfs->get_u2_fast();
}
const int size = length;
Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
_permitted_subclasses = permitted_subclasses;
if (length > 0) {
int index = 0;
cfs->guarantee_more(2 * length, CHECK_0);
for (int n = 0; n < length; n++) {
const u2 class_info_index = cfs->get_u2_fast();
guarantee_property(
valid_klass_reference_at(class_info_index),
"Permitted subclass class_info_index %u has bad constant type in class file %s",
class_info_index, CHECK_0);
permitted_subclasses->at_put(index++, class_info_index);
}
assert(index == size, "wrong size");
}
// Restore buffer's current position.
cfs->set_current(current_mark);
return length;
}
// Record {
// u2 attribute_name_index;
// u4 attribute_length;
// u2 components_count;
// component_info components[components_count];
// }
// component_info {
// u2 name_index;
// u2 descriptor_index
// u2 attributes_count;
// attribute_info_attributes[attributes_count];
// }
u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
const ConstantPool* cp,
const u1* const record_attribute_start,
TRAPS) {
const u1* const current_mark = cfs->current();
int components_count = 0;
unsigned int calculate_attr_size = 0;
if (record_attribute_start != nullptr) {
cfs->set_current(record_attribute_start);
cfs->guarantee_more(2, CHECK_0); // num of components
components_count = (int)cfs->get_u2_fast();
calculate_attr_size = 2;
}
Array<RecordComponent*>* const record_components =
MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, nullptr, CHECK_0);
_record_components = record_components;
for (int x = 0; x < components_count; x++) {
cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
const u2 name_index = cfs->get_u2_fast();
guarantee_property(valid_symbol_at(name_index),
"Invalid constant pool index %u for name in Record attribute in class file %s",
name_index, CHECK_0);
const Symbol* const name = cp->symbol_at(name_index);
verify_legal_field_name(name, CHECK_0);
const u2 descriptor_index = cfs->get_u2_fast();
guarantee_property(valid_symbol_at(descriptor_index),
"Invalid constant pool index %u for descriptor in Record attribute in class file %s",
descriptor_index, CHECK_0);
const Symbol* const descr = cp->symbol_at(descriptor_index);
verify_legal_field_signature(name, descr, CHECK_0);
const u2 attributes_count = cfs->get_u2_fast();
calculate_attr_size += 6;
u2 generic_sig_index = 0;
const u1* runtime_visible_annotations = nullptr;
int runtime_visible_annotations_length = 0;
bool runtime_invisible_annotations_exists = false;
const u1* runtime_visible_type_annotations = nullptr;
int runtime_visible_type_annotations_length = 0;
bool runtime_invisible_type_annotations_exists = false;
// Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
// and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored.
for (int y = 0; y < attributes_count; y++) {
cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length
const u2 attribute_name_index = cfs->get_u2_fast();
const u4 attribute_length = cfs->get_u4_fast();
calculate_attr_size += 6;
guarantee_property(
valid_symbol_at(attribute_name_index),
"Invalid Record attribute name index %u in class file %s",
attribute_name_index, CHECK_0);
const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
if (attribute_name == vmSymbols::tag_signature()) {
if (generic_sig_index != 0) {
classfile_parse_error(
"Multiple Signature attributes for Record component in class file %s",
THREAD);
return 0;
}
if (attribute_length != 2) {
classfile_parse_error(
"Invalid Signature attribute length %u in Record component in class file %s",
attribute_length, THREAD);
return 0;
}
generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
} else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
if (runtime_visible_annotations != nullptr) {
classfile_parse_error(
"Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD);
return 0;
}
runtime_visible_annotations_length = attribute_length;
runtime_visible_annotations = cfs->current();
assert(runtime_visible_annotations != nullptr, "null record component visible annotation");
cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
cfs->skip_u1_fast(runtime_visible_annotations_length);
} else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
if (runtime_invisible_annotations_exists) {
classfile_parse_error(
"Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD);
return 0;
}
runtime_invisible_annotations_exists = true;
cfs->skip_u1(attribute_length, CHECK_0);
} else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
if (runtime_visible_type_annotations != nullptr) {
classfile_parse_error(
"Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
return 0;
}
runtime_visible_type_annotations_length = attribute_length;
runtime_visible_type_annotations = cfs->current();
assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation");
cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
cfs->skip_u1_fast(runtime_visible_type_annotations_length);
} else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
if (runtime_invisible_type_annotations_exists) {
classfile_parse_error(
"Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
return 0;
}
runtime_invisible_type_annotations_exists = true;
cfs->skip_u1(attribute_length, CHECK_0);
} else {
// Skip unknown attributes
cfs->skip_u1(attribute_length, CHECK_0);
}
calculate_attr_size += attribute_length;
} // End of attributes For loop
AnnotationArray* annotations = allocate_annotations(runtime_visible_annotations,
runtime_visible_annotations_length,
CHECK_0);
AnnotationArray* type_annotations = allocate_annotations(runtime_visible_type_annotations,
runtime_visible_type_annotations_length,
CHECK_0);
RecordComponent* record_component =
RecordComponent::allocate(_loader_data, name_index, descriptor_index, generic_sig_index,
annotations, type_annotations, CHECK_0);
record_components->at_put(x, record_component);
} // End of component processing loop
// Restore buffer's current position.
cfs->set_current(current_mark);
return calculate_attr_size;
}
void ClassFileParser::parse_classfile_synthetic_attribute() {
set_class_synthetic_flag(true);
}
void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
assert(cfs != nullptr, "invariant");
const u2 signature_index = cfs->get_u2(CHECK);
guarantee_property(
valid_symbol_at(signature_index),
"Invalid constant pool index %u in Signature attribute in class file %s",
signature_index, CHECK);
set_class_generic_signature_index(signature_index);
}
void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
ConstantPool* cp,
u4 attribute_byte_length,
TRAPS) {
assert(cfs != nullptr, "invariant");
assert(cp != nullptr, "invariant");
const u1* const current_start = cfs->current();
guarantee_property(attribute_byte_length >= sizeof(u2),
"Invalid BootstrapMethods attribute length %u in class file %s",
attribute_byte_length,
CHECK);
cfs->guarantee_more(attribute_byte_length, CHECK);
const int attribute_array_length = cfs->get_u2_fast();
guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
"Short length on BootstrapMethods in class file %s",
CHECK);
// The attribute contains a counted array of counted tuples of shorts,
// represending bootstrap specifiers:
// length*{bootstrap_method_index, argument_count*{argument_index}}
const unsigned int operand_count = (attribute_byte_length - (unsigned)sizeof(u2)) / (unsigned)sizeof(u2);
// operand_count = number of shorts in attr, except for leading length
// The attribute is copied into a short[] array.
// The array begins with a series of short[2] pairs, one for each tuple.
const int index_size = (attribute_array_length * 2);
Array<u2>* const operands =
MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
// Eagerly assign operands so they will be deallocated with the constant
// pool if there is an error.
cp->set_operands(operands);
int operand_fill_index = index_size;
const int cp_size = cp->length();
for (int n = 0; n < attribute_array_length; n++) {
// Store a 32-bit offset into the header of the operand array.
ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
// Read a bootstrap specifier.
cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
const u2 bootstrap_method_index = cfs->get_u2_fast();
const u2 argument_count = cfs->get_u2_fast();
guarantee_property(
valid_cp_range(bootstrap_method_index, cp_size) &&
cp->tag_at(bootstrap_method_index).is_method_handle(),
"bootstrap_method_index %u has bad constant type in class file %s",
bootstrap_method_index,
CHECK);
guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
"Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
CHECK);
operands->at_put(operand_fill_index++, bootstrap_method_index);
operands->at_put(operand_fill_index++, argument_count);
cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
for (int j = 0; j < argument_count; j++) {
const u2 argument_index = cfs->get_u2_fast();
guarantee_property(
valid_cp_range(argument_index, cp_size) &&
cp->tag_at(argument_index).is_loadable_constant(),
"argument_index %u has bad constant type in class file %s",
argument_index,
CHECK);
operands->at_put(operand_fill_index++, argument_index);
}
}
guarantee_property(current_start + attribute_byte_length == cfs->current(),
"Bad length on BootstrapMethods in class file %s",
CHECK);
}
void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
ConstantPool* cp,
ClassFileParser::ClassAnnotationCollector* parsed_annotations,
TRAPS) {
assert(cfs != nullptr, "invariant");
assert(cp != nullptr, "invariant");
assert(parsed_annotations != nullptr, "invariant");
// Set inner classes attribute to default sentinel
_inner_classes = Universe::the_empty_short_array();
// Set nest members attribute to default sentinel
_nest_members = Universe::the_empty_short_array();
// Set _permitted_subclasses attribute to default sentinel
_permitted_subclasses = Universe::the_empty_short_array();
cfs->guarantee_more(2, CHECK); // attributes_count
u2 attributes_count = cfs->get_u2_fast();
bool parsed_sourcefile_attribute = false;
bool parsed_innerclasses_attribute = false;
bool parsed_nest_members_attribute = false;
bool parsed_permitted_subclasses_attribute = false;
bool parsed_nest_host_attribute = false;
bool parsed_record_attribute = false;
bool parsed_enclosingmethod_attribute = false;
bool parsed_bootstrap_methods_attribute = false;
const u1* runtime_visible_annotations = nullptr;
int runtime_visible_annotations_length = 0;
const u1* runtime_visible_type_annotations = nullptr;
int runtime_visible_type_annotations_length = 0;
bool runtime_invisible_type_annotations_exists = false;
bool runtime_invisible_annotations_exists = false;
bool parsed_source_debug_ext_annotations_exist = false;
const u1* inner_classes_attribute_start = nullptr;
u4 inner_classes_attribute_length = 0;
u2 enclosing_method_class_index = 0;
u2 enclosing_method_method_index = 0;
const u1* nest_members_attribute_start = nullptr;
u4 nest_members_attribute_length = 0;
const u1* record_attribute_start = nullptr;
u4 record_attribute_length = 0;
const u1* permitted_subclasses_attribute_start = nullptr;
u4 permitted_subclasses_attribute_length = 0;
// Iterate over attributes
while (attributes_count--) {
cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
const u2 attribute_name_index = cfs->get_u2_fast();
const u4 attribute_length = cfs->get_u4_fast();
guarantee_property(
valid_symbol_at(attribute_name_index),
"Attribute name has bad constant pool index %u in class file %s",
attribute_name_index, CHECK);
const Symbol* const tag = cp->symbol_at(attribute_name_index);
if (tag == vmSymbols::tag_source_file()) {
// Check for SourceFile tag
if (_need_verify) {
guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
}
if (parsed_sourcefile_attribute) {
classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
return;
} else {
parsed_sourcefile_attribute = true;
}
parse_classfile_sourcefile_attribute(cfs, CHECK);
} else if (tag == vmSymbols::tag_source_debug_extension()) {
// Check for SourceDebugExtension tag
if (parsed_source_debug_ext_annotations_exist) {
classfile_parse_error(
"Multiple SourceDebugExtension attributes in class file %s", THREAD);
return;
}
parsed_source_debug_ext_annotations_exist = true;
parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
} else if (tag == vmSymbols::tag_inner_classes()) {
// Check for InnerClasses tag
if (parsed_innerclasses_attribute) {
classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD);
return;
} else {
parsed_innerclasses_attribute = true;
}
inner_classes_attribute_start = cfs->current();
inner_classes_attribute_length = attribute_length;
cfs->skip_u1(inner_classes_attribute_length, CHECK);
} else if (tag == vmSymbols::tag_synthetic()) {
// Check for Synthetic tag
// Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
if (attribute_length != 0) {
classfile_parse_error(
"Invalid Synthetic classfile attribute length %u in class file %s",
attribute_length, THREAD);
return;
}
parse_classfile_synthetic_attribute();
} else if (tag == vmSymbols::tag_deprecated()) {
// Check for Deprecated tag - 4276120
if (attribute_length != 0) {
classfile_parse_error(
"Invalid Deprecated classfile attribute length %u in class file %s",
attribute_length, THREAD);
return;
}
} else if (_major_version >= JAVA_1_5_VERSION) {
if (tag == vmSymbols::tag_signature()) {
if (_generic_signature_index != 0) {
classfile_parse_error(
"Multiple Signature attributes in class file %s", THREAD);
return;
}
if (attribute_length != 2) {
classfile_parse_error(
"Wrong Signature attribute length %u in class file %s",
attribute_length, THREAD);
return;
}
parse_classfile_signature_attribute(cfs, CHECK);
} else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
if (runtime_visible_annotations != nullptr) {
classfile_parse_error(
"Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD);
return;
}
runtime_visible_annotations_length = attribute_length;
runtime_visible_annotations = cfs->current();
assert(runtime_visible_annotations != nullptr, "null visible annotations");
cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
parse_annotations(cp,
runtime_visible_annotations,
runtime_visible_annotations_length,
parsed_annotations,
_loader_data,
_can_access_vm_annotations);
cfs->skip_u1_fast(runtime_visible_annotations_length);
} else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
if (runtime_invisible_annotations_exists) {
classfile_parse_error(
"Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD);
return;
}
runtime_invisible_annotations_exists = true;
cfs->skip_u1(attribute_length, CHECK);
} else if (tag == vmSymbols::tag_enclosing_method()) {
if (parsed_enclosingmethod_attribute) {
classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD);
return;
} else {
parsed_enclosingmethod_attribute = true;
}
guarantee_property(attribute_length == 4,
"Wrong EnclosingMethod attribute length %u in class file %s",
attribute_length, CHECK);
cfs->guarantee_more(4, CHECK); // class_index, method_index
enclosing_method_class_index = cfs->get_u2_fast();
enclosing_method_method_index = cfs->get_u2_fast();
if (enclosing_method_class_index == 0) {
classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD);
return;
}
// Validate the constant pool indices and types
guarantee_property(valid_klass_reference_at(enclosing_method_class_index),
"Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
if (enclosing_method_method_index != 0 &&
(!cp->is_within_bounds(enclosing_method_method_index) ||
!cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD);
return;
}
} else if (tag == vmSymbols::tag_bootstrap_methods() &&
_major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
if (parsed_bootstrap_methods_attribute) {
classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD);
return;
}
parsed_bootstrap_methods_attribute = true;
parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
} else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
if (runtime_visible_type_annotations != nullptr) {
classfile_parse_error(
"Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD);
return;
}
runtime_visible_type_annotations_length = attribute_length;
runtime_visible_type_annotations = cfs->current();
assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
// No need for the VM to parse Type annotations
cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
} else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
if (runtime_invisible_type_annotations_exists) {
classfile_parse_error(
"Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD);
return;
}
runtime_invisible_type_annotations_exists = true;
cfs->skip_u1(attribute_length, CHECK);
} else if (_major_version >= JAVA_11_VERSION) {
if (tag == vmSymbols::tag_nest_members()) {
// Check for NestMembers tag
if (parsed_nest_members_attribute) {
classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD);
return;
} else {
parsed_nest_members_attribute = true;
}
if (parsed_nest_host_attribute) {
classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD);
return;
}
nest_members_attribute_start = cfs->current();
nest_members_attribute_length = attribute_length;
cfs->skip_u1(nest_members_attribute_length, CHECK);
} else if (tag == vmSymbols::tag_nest_host()) {
if (parsed_nest_host_attribute) {
classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD);
return;
} else {
parsed_nest_host_attribute = true;
}
if (parsed_nest_members_attribute) {
classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD);
return;
}
if (_need_verify) {
guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
}
cfs->guarantee_more(2, CHECK);
u2 class_info_index = cfs->get_u2_fast();
guarantee_property(
valid_klass_reference_at(class_info_index),
"Nest-host class_info_index %u has bad constant type in class file %s",
class_info_index, CHECK);
_nest_host = class_info_index;
} else if (_major_version >= JAVA_16_VERSION) {
if (tag == vmSymbols::tag_record()) {
if (parsed_record_attribute) {
classfile_parse_error("Multiple Record attributes in class file %s", THREAD);
return;
}
parsed_record_attribute = true;
record_attribute_start = cfs->current();
record_attribute_length = attribute_length;
} else if (_major_version >= JAVA_17_VERSION) {
if (tag == vmSymbols::tag_permitted_subclasses()) {
if (parsed_permitted_subclasses_attribute) {
classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
return;
}
// Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
if (_access_flags.is_final()) {
classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
return;
}
parsed_permitted_subclasses_attribute = true;
permitted_subclasses_attribute_start = cfs->current();
permitted_subclasses_attribute_length = attribute_length;
}
}
// Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
cfs->skip_u1(attribute_length, CHECK);
} else {
// Unknown attribute
cfs->skip_u1(attribute_length, CHECK);
}
} else {
// Unknown attribute
cfs->skip_u1(attribute_length, CHECK);
}
} else {
// Unknown attribute
cfs->skip_u1(attribute_length, CHECK);
}
}
_class_annotations = allocate_annotations(runtime_visible_annotations,
runtime_visible_annotations_length,
CHECK);
_class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
runtime_visible_type_annotations_length,
CHECK);
if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
const u2 num_of_classes = parse_classfile_inner_classes_attribute(
cfs,
cp,
inner_classes_attribute_start,
parsed_innerclasses_attribute,
enclosing_method_class_index,
enclosing_method_method_index,
CHECK);
if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
guarantee_property(
inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
"Wrong InnerClasses attribute length in class file %s", CHECK);
}
}
if (parsed_nest_members_attribute) {
const u2 num_of_classes = parse_classfile_nest_members_attribute(
cfs,
nest_members_attribute_start,
CHECK);
if (_need_verify) {
guarantee_property(
nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
"Wrong NestMembers attribute length in class file %s", CHECK);
}
}
if (parsed_record_attribute) {
const unsigned int calculated_attr_length = parse_classfile_record_attribute(
cfs,
cp,
record_attribute_start,
CHECK);
if (_need_verify) {
guarantee_property(record_attribute_length == calculated_attr_length,
"Record attribute has wrong length in class file %s",
CHECK);
}
}
if (parsed_permitted_subclasses_attribute) {
const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
cfs,
permitted_subclasses_attribute_start,
CHECK);
if (_need_verify) {
guarantee_property(
permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
"Wrong PermittedSubclasses attribute length in class file %s", CHECK);
}
}
if (_max_bootstrap_specifier_index >= 0) {
guarantee_property(parsed_bootstrap_methods_attribute,
"Missing BootstrapMethods attribute in class file %s", CHECK);
}
}
void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
assert(k != nullptr, "invariant");
if (_synthetic_flag)
k->set_is_synthetic();
if (_sourcefile_index != 0) {
k->set_source_file_name_index(_sourcefile_index);
}
if (_generic_signature_index != 0) {
k->set_generic_signature_index(_generic_signature_index);
}
if (_sde_buffer != nullptr) {
k->set_source_debug_extension(_sde_buffer, _sde_length);
}
}
// Create the Annotations object that will
// hold the annotations array for the Klass.
void ClassFileParser::create_combined_annotations(TRAPS) {
if (_class_annotations == nullptr &&
_class_type_annotations == nullptr &&
_fields_annotations == nullptr &&
_fields_type_annotations == nullptr) {
// Don't create the Annotations object unnecessarily.
return;
}
Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
annotations->set_class_annotations(_class_annotations);
annotations->set_class_type_annotations(_class_type_annotations);
annotations->set_fields_annotations(_fields_annotations);
annotations->set_fields_type_annotations(_fields_type_annotations);
// This is the Annotations object that will be
// assigned to InstanceKlass being constructed.
_combined_annotations = annotations;
// The annotations arrays below has been transferred the
// _combined_annotations so these fields can now be cleared.
_class_annotations = nullptr;
_class_type_annotations = nullptr;
_fields_annotations = nullptr;
_fields_type_annotations = nullptr;
}
// Transfer ownership of metadata allocated to the InstanceKlass.
void ClassFileParser::apply_parsed_class_metadata(
InstanceKlass* this_klass,
int java_fields_count) {
assert(this_klass != nullptr, "invariant");
_cp->set_pool_holder(this_klass);
this_klass->set_constants(_cp);
this_klass->set_fieldinfo_stream(_fieldinfo_stream);
this_klass->set_fieldinfo_search_table(_fieldinfo_search_table);
this_klass->set_fields_status(_fields_status);
this_klass->set_methods(_methods);
this_klass->set_inner_classes(_inner_classes);
this_klass->set_nest_members(_nest_members);
this_klass->set_nest_host_index(_nest_host);
this_klass->set_annotations(_combined_annotations);
this_klass->set_permitted_subclasses(_permitted_subclasses);
this_klass->set_record_components(_record_components);
DEBUG_ONLY(FieldInfoStream::validate_search_table(_cp, _fieldinfo_stream, _fieldinfo_search_table));
// Delay the setting of _local_interfaces and _transitive_interfaces until after
// initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
// be shared with _transitive_interfaces and _transitive_interfaces may be shared with
// its _super. If an OOM occurs while loading the current klass, its _super field
// may not have been set. When GC tries to free the klass, the _transitive_interfaces
// may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
// dereferences to the deallocated _transitive_interfaces will result in a crash.
// Clear out these fields so they don't get deallocated by the destructor
clear_class_metadata();
}
AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
int anno_length,
TRAPS) {
AnnotationArray* annotations = nullptr;
if (anno != nullptr) {
annotations = MetadataFactory::new_array<u1>(_loader_data,
anno_length,
CHECK_(annotations));
for (int i = 0; i < anno_length; i++) {
annotations->at_put(i, anno[i]);
}
}
return annotations;
}
const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
const int super_class_index,
const bool need_verify,
TRAPS) {
assert(cp != nullptr, "invariant");
const InstanceKlass* super_klass = nullptr;
if (super_class_index == 0) {
guarantee_property(_class_name == vmSymbols::java_lang_Object(),
"Invalid superclass index %u in class file %s",
super_class_index,
CHECK_NULL);
} else {
guarantee_property(valid_klass_reference_at(super_class_index),
"Invalid superclass index %u in class file %s",
super_class_index,
CHECK_NULL);
// The class name should be legal because it is checked when parsing constant pool.
// However, make sure it is not an array type.
bool is_array = false;
if (cp->tag_at(super_class_index).is_klass()) {
super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
if (need_verify)
is_array = super_klass->is_array_klass();
} else if (need_verify) {
is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
}
if (need_verify) {
guarantee_property(!is_array,
"Bad superclass name in class file %s", CHECK_NULL);
}
}
return super_klass;
}
OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
_max_nonstatic_oop_maps = max_blocks;
_nonstatic_oop_map_count = 0;
if (max_blocks == 0) {
_nonstatic_oop_maps = nullptr;
} else {
_nonstatic_oop_maps =
NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
}
}
OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
}
// addition of super oop maps
void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
nof_blocks <= _max_nonstatic_oop_maps, "invariant");
memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
_nonstatic_oop_map_count += nof_blocks;
}
// collection of oops
void OopMapBlocksBuilder::add(int offset, int count) {
if (_nonstatic_oop_map_count == 0) {
_nonstatic_oop_map_count++;
}
OopMapBlock* nonstatic_oop_map = last_oop_map();
if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
nonstatic_oop_map->set_offset(offset);
nonstatic_oop_map->set_count(count);
} else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
nonstatic_oop_map->increment_count(count);
} else { // Need a new one...
_nonstatic_oop_map_count++;
assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
nonstatic_oop_map = last_oop_map();
nonstatic_oop_map->set_offset(offset);
nonstatic_oop_map->set_count(count);
}
}
// general purpose copy, e.g. into allocated instanceKlass
void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
if (_nonstatic_oop_map_count != 0) {
memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
}
}
// Sort and compact adjacent blocks
void OopMapBlocksBuilder::compact() {
if (_nonstatic_oop_map_count <= 1) {
return;
}
/*
* Since field layout sneaks in oops before values, we will be able to condense
* blocks. There is potential to compact between super, own refs and values
* containing refs.
*
* Currently compaction is slightly limited due to values being 8 byte aligned.
* This may well change: FixMe if it doesn't, the code below is fairly general purpose
* and maybe it doesn't need to be.
*/
qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
(_sort_Fn)OopMapBlock::compare_offset);
if (_nonstatic_oop_map_count < 2) {
return;
}
// Make a temp copy, and iterate through and copy back into the original
ResourceMark rm;
OopMapBlock* oop_maps_copy =
NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
copy(oop_maps_copy);
OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
unsigned int new_count = 1;
oop_maps_copy++;
while(oop_maps_copy < oop_maps_copy_end) {
assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
nonstatic_oop_map->increment_count(oop_maps_copy->count());
} else {
nonstatic_oop_map++;
new_count++;
nonstatic_oop_map->set_offset(oop_maps_copy->offset());
nonstatic_oop_map->set_count(oop_maps_copy->count());
}
oop_maps_copy++;
}
assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
_nonstatic_oop_map_count = new_count;
}
void OopMapBlocksBuilder::print_on(outputStream* st) const {
st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
if (_nonstatic_oop_map_count > 0) {
OopMapBlock* map = _nonstatic_oop_maps;
OopMapBlock* last_map = last_oop_map();
assert(map <= last_map, "Last less than first");
while (map <= last_map) {
st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
map->offset() + map->offset_span() - heapOopSize, map->count());
map++;
}
}
}
void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
print_on(st);
}
void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
assert(ik != nullptr, "invariant");
const InstanceKlass* const super = ik->java_super();
// Check if this klass has an empty finalize method (i.e. one with return bytecode only),
// in which case we don't have to register objects as finalizable
if (!_has_empty_finalizer) {
if (_has_finalizer ||
(super != nullptr && super->has_finalizer())) {
ik->set_has_finalizer();
}
}
#ifdef ASSERT
bool f = false;
const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
vmSymbols::void_method_signature());
if (InstanceKlass::is_finalization_enabled() &&
(m != nullptr) && !m->is_empty_method()) {
f = true;
}
// Spec doesn't prevent agent from redefinition of empty finalizer.
// Despite the fact that it's generally bad idea and redefined finalizer
// will not work as expected we shouldn't abort vm in this case
if (!ik->has_redefined_this_or_super()) {
assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
}
#endif
// Check if this klass supports the java.lang.Cloneable interface
if (vmClasses::Cloneable_klass_loaded()) {
if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
ik->set_is_cloneable();
}
}
// If it cannot be fast-path allocated, set a bit in the layout helper.
// See documentation of InstanceKlass::can_be_fastpath_allocated().
assert(ik->size_helper() > 0, "layout_helper is initialized");
if (ik->is_abstract() || ik->is_interface()
|| (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
|| ik->size_helper() >= FastAllocateSizeLimit) {
// Forbid fast-path allocation.
const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
ik->set_layout_helper(lh);
}
}
// utility methods for appending an array with check for duplicates
static void append_interfaces(GrowableArray<InstanceKlass*>* result,
const Array<InstanceKlass*>* const ifs) {
// iterate over new interfaces
for (int i = 0; i < ifs->length(); i++) {
InstanceKlass* const e = ifs->at(i);
assert(e->is_klass() && e->is_interface(), "just checking");
// add new interface
result->append_if_missing(e);
}
}
static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
Array<InstanceKlass*>* local_ifs,
ClassLoaderData* loader_data,
TRAPS) {
assert(local_ifs != nullptr, "invariant");
assert(loader_data != nullptr, "invariant");
// Compute maximum size for transitive interfaces
int max_transitive_size = 0;
int super_size = 0;
// Add superclass transitive interfaces size
if (super != nullptr) {
super_size = super->transitive_interfaces()->length();
max_transitive_size += super_size;
}
// Add local interfaces' super interfaces
const int local_size = local_ifs->length();
for (int i = 0; i < local_size; i++) {
InstanceKlass* const l = local_ifs->at(i);
max_transitive_size += l->transitive_interfaces()->length();
}
// Finally add local interfaces
max_transitive_size += local_size;
// Construct array
if (max_transitive_size == 0) {
// no interfaces, use canonicalized array
return Universe::the_empty_instance_klass_array();
} else if (max_transitive_size == super_size) {
// no new local interfaces added, share superklass' transitive interface array
return super->transitive_interfaces();
} else if (max_transitive_size == local_size) {
// only local interfaces added, share local interface array
return local_ifs;
} else {
ResourceMark rm;
GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
// Copy down from superclass
if (super != nullptr) {
append_interfaces(result, super->transitive_interfaces());
}
// Copy down from local interfaces' superinterfaces
for (int i = 0; i < local_size; i++) {
InstanceKlass* const l = local_ifs->at(i);
append_interfaces(result, l->transitive_interfaces());
}
// Finally add local interfaces
append_interfaces(result, local_ifs);
// length will be less than the max_transitive_size if duplicates were removed
const int length = result->length();
assert(length <= max_transitive_size, "just checking");
Array<InstanceKlass*>* const new_result =
MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
for (int i = 0; i < length; i++) {
InstanceKlass* const e = result->at(i);
assert(e != nullptr, "just checking");
new_result->at_put(i, e);
}
return new_result;
}
}
void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
assert(this_klass != nullptr, "invariant");
const Klass* const super = this_klass->super();
if (super != nullptr) {
const InstanceKlass* super_ik = InstanceKlass::cast(super);
if (super->is_final()) {
classfile_icce_error("class %s cannot inherit from final class %s", super_ik, THREAD);
return;
}
if (super_ik->is_sealed()) {
stringStream ss;
ResourceMark rm(THREAD);
if (!super_ik->has_as_permitted_subclass(this_klass, ss)) {
classfile_icce_error(ss.as_string(), THREAD);
return;
}
}
Reflection::VerifyClassAccessResults vca_result =
Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
if (vca_result != Reflection::ACCESS_OK) {
ResourceMark rm(THREAD);
char* msg = Reflection::verify_class_access_msg(this_klass,
InstanceKlass::cast(super),
vca_result);
// Names are all known to be < 64k so we know this formatted message is not excessively large.
if (msg == nullptr) {
bool same_module = (this_klass->module() == super->module());
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_IllegalAccessError(),
"class %s cannot access its %ssuperclass %s (%s%s%s)",
this_klass->external_name(),
super->is_abstract() ? "abstract " : "",
super->external_name(),
(same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
(same_module) ? "" : "; ",
(same_module) ? "" : super->class_in_module_of_loader());
} else {
// Add additional message content.
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_IllegalAccessError(),
"superclass access check failed: %s",
msg);
}
}
}
}
void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
assert(this_klass != nullptr, "invariant");
const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
const int lng = local_interfaces->length();
for (int i = lng - 1; i >= 0; i--) {
InstanceKlass* const k = local_interfaces->at(i);
assert (k != nullptr && k->is_interface(), "invalid interface");
if (k->is_sealed()) {
stringStream ss;
ResourceMark rm(THREAD);
if (!k->has_as_permitted_subclass(this_klass, ss)) {
classfile_icce_error(ss.as_string(), THREAD);
return;
}
}
Reflection::VerifyClassAccessResults vca_result =
Reflection::verify_class_access(this_klass, k, false);
if (vca_result != Reflection::ACCESS_OK) {
ResourceMark rm(THREAD);
char* msg = Reflection::verify_class_access_msg(this_klass,
k,
vca_result);
// Names are all known to be < 64k so we know this formatted message is not excessively large.
if (msg == nullptr) {
bool same_module = (this_klass->module() == k->module());
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_IllegalAccessError(),
"class %s cannot access its superinterface %s (%s%s%s)",
this_klass->external_name(),
k->external_name(),
(same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
(same_module) ? "" : "; ",
(same_module) ? "" : k->class_in_module_of_loader());
return;
} else {
// Add additional message content.
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_IllegalAccessError(),
"superinterface check failed: %s",
msg);
return;
}
}
}
}
static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
assert(this_klass != nullptr, "invariant");
const Array<Method*>* const methods = this_klass->methods();
const int num_methods = methods->length();
// go thru each method and check if it overrides a final method
for (int index = 0; index < num_methods; index++) {
const Method* const m = methods->at(index);
// skip private, static, and <init> methods
if ((!m->is_private() && !m->is_static()) &&
(m->name() != vmSymbols::object_initializer_name())) {
const Symbol* const name = m->name();
const Symbol* const signature = m->signature();
const InstanceKlass* k = this_klass->java_super();
const Method* super_m = nullptr;
while (k != nullptr) {
// skip supers that don't have final methods.
if (k->has_final_method()) {
// lookup a matching method in the super class hierarchy
super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
if (super_m == nullptr) {
break; // didn't find any match; get out
}
if (super_m->is_final() && !super_m->is_static() &&
!super_m->access_flags().is_private()) {
// matching method in super is final, and not static or private
bool can_access = Reflection::verify_member_access(this_klass,
super_m->method_holder(),
super_m->method_holder(),
super_m->access_flags(),
false, false, CHECK);
if (can_access) {
// this class can access super final method and therefore override
ResourceMark rm(THREAD);
THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
err_msg("class %s overrides final method %s.%s%s",
this_klass->external_name(),
super_m->method_holder()->external_name(),
name->as_C_string(),
signature->as_C_string()));
}
}
// continue to look from super_m's holder's super.
k = super_m->method_holder()->java_super();
continue;
}
k = k->java_super();
}
}
}
}
// assumes that this_klass is an interface
static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
assert(this_klass != nullptr, "invariant");
assert(this_klass->is_interface(), "not an interface");
const Array<Method*>* methods = this_klass->methods();
const int num_methods = methods->length();
for (int index = 0; index < num_methods; index++) {
const Method* const m = methods->at(index);
// if m is static and not the init method, throw a verify error
if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
ResourceMark rm(THREAD);
// Names are all known to be < 64k so we know this formatted message is not excessively large.
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_VerifyError(),
"Illegal static method %s in interface %s",
m->name()->as_C_string(),
this_klass->external_name()
);
return;
}
}
}
// utility methods for format checking
void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
const bool is_module = (flags & JVM_ACC_MODULE) != 0;
assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
if (is_module) {
ResourceMark rm(THREAD);
// Names are all known to be < 64k so we know this formatted message is not excessively large.
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_NoClassDefFoundError(),
"%s is not a class because access_flag ACC_MODULE is set",
_class_name->as_C_string());
return;
}
if (!_need_verify) { return; }
const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
const bool is_final = (flags & JVM_ACC_FINAL) != 0;
const bool is_super = (flags & JVM_ACC_SUPER) != 0;
const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
if ((is_abstract && is_final) ||
(is_interface && !is_abstract) ||
(is_interface && major_gte_1_5 && (is_super || is_enum)) ||
(!is_interface && major_gte_1_5 && is_annotation)) {
ResourceMark rm(THREAD);
// Names are all known to be < 64k so we know this formatted message is not excessively large.
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_ClassFormatError(),
"Illegal class modifiers in class %s: 0x%X",
_class_name->as_C_string(), flags
);
return;
}
}
static bool has_illegal_visibility(jint flags) {
const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
return ((is_public && is_protected) ||
(is_public && is_private) ||
(is_protected && is_private));
}
// A legal major_version.minor_version must be one of the following:
//
// Major_version >= 45 and major_version < 56, any minor_version.
// Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
// Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
//
void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
ResourceMark rm(THREAD);
const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
if (major < JAVA_MIN_SUPPORTED_VERSION) {
classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version",
class_name, major, minor, THREAD);
return;
}
if (major > max_version) {
// Names are all known to be < 64k so we know this formatted message is not excessively large.
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_UnsupportedClassVersionError(),
"%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
"this version of the Java Runtime only recognizes class file versions up to %u.0",
class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
return;
}
if (major < JAVA_12_VERSION || minor == 0) {
return;
}
if (minor == JAVA_PREVIEW_MINOR_VERSION) {
if (major != max_version) {
// Names are all known to be < 64k so we know this formatted message is not excessively large.
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_UnsupportedClassVersionError(),
"%s (class file version %u.%u) was compiled with preview features that are unsupported. "
"This version of the Java Runtime only recognizes preview features for class file version %u.%u",
class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
return;
}
if (!Arguments::enable_preview()) {
classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
class_name, major, minor, THREAD);
return;
}
} else { // minor != JAVA_PREVIEW_MINOR_VERSION
classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
class_name, major, minor, THREAD);
}
}
void ClassFileParser::verify_legal_field_modifiers(jint flags,
bool is_interface,
TRAPS) const {
if (!_need_verify) { return; }
const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
const bool is_static = (flags & JVM_ACC_STATIC) != 0;
const bool is_final = (flags & JVM_ACC_FINAL) != 0;
const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
bool is_illegal = false;
if (is_interface) {
if (!is_public || !is_static || !is_final || is_private ||
is_protected || is_volatile || is_transient ||
(major_gte_1_5 && is_enum)) {
is_illegal = true;
}
} else { // not interface
if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
is_illegal = true;
}
}
if (is_illegal) {
ResourceMark rm(THREAD);
// Names are all known to be < 64k so we know this formatted message is not excessively large.
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_ClassFormatError(),
"Illegal field modifiers in class %s: 0x%X",
_class_name->as_C_string(), flags);
return;
}
}
void ClassFileParser::verify_legal_method_modifiers(jint flags,
bool is_interface,
const Symbol* name,
TRAPS) const {
if (!_need_verify) { return; }
const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
const bool is_static = (flags & JVM_ACC_STATIC) != 0;
const bool is_final = (flags & JVM_ACC_FINAL) != 0;
const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
const bool is_initializer = (name == vmSymbols::object_initializer_name());
bool is_illegal = false;
if (is_interface) {
if (major_gte_8) {
// Class file version is JAVA_8_VERSION or later Methods of
// interfaces may set any of the flags except ACC_PROTECTED,
// ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
// have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
(is_native || is_protected || is_final || is_synchronized) ||
// If a specific method of a class or interface has its
// ACC_ABSTRACT flag set, it must not have any of its
// ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
// ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
// check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
// those flags are illegal irrespective of ACC_ABSTRACT being set or not.
(is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
is_illegal = true;
}
} else if (major_gte_1_5) {
// Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
if (!is_public || is_private || is_protected || is_static || is_final ||
is_synchronized || is_native || !is_abstract || is_strict) {
is_illegal = true;
}
} else {
// Class file version is pre-JAVA_1_5_VERSION
if (!is_public || is_static || is_final || is_native || !is_abstract) {
is_illegal = true;
}
}
} else { // not interface
if (has_illegal_visibility(flags)) {
is_illegal = true;
} else {
if (is_initializer) {
if (is_static || is_final || is_synchronized || is_native ||
is_abstract || (major_gte_1_5 && is_bridge)) {
is_illegal = true;
}
} else { // not initializer
if (is_abstract) {
if ((is_final || is_native || is_private || is_static ||
(major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
is_illegal = true;
}
}
}
}
}
if (is_illegal) {
ResourceMark rm(THREAD);
// Names are all known to be < 64k so we know this formatted message is not excessively large.
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_ClassFormatError(),
"Method %s in class %s has illegal modifiers: 0x%X",
name->as_C_string(), _class_name->as_C_string(), flags);
return;
}
}
void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
int length,
TRAPS) const {
assert(_need_verify, "only called when _need_verify is true");
// Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
}
}
// Unqualified names may not contain the characters '.', ';', '[', or '/'.
// In class names, '/' separates unqualified names. This is verified in this function also.
// Method names also may not contain the characters '<' or '>', unless <init>
// or <clinit>. Note that method names may not be <init> or <clinit> in this
// method. Because these names have been checked as special cases before
// calling this method in verify_legal_method_name.
//
// This method is also called from the modular system APIs in modules.cpp
// to verify the validity of module and package names.
bool ClassFileParser::verify_unqualified_name(const char* name,
unsigned int length,
int type) {
if (length == 0) return false; // Must have at least one char.
for (const char* p = name; p != name + length; p++) {
switch(*p) {
case JVM_SIGNATURE_DOT:
case JVM_SIGNATURE_ENDCLASS:
case JVM_SIGNATURE_ARRAY:
// do not permit '.', ';', or '['
return false;
case JVM_SIGNATURE_SLASH:
// check for '//' or leading or trailing '/' which are not legal
// unqualified name must not be empty
if (type == ClassFileParser::LegalClass) {
if (p == name || p+1 >= name+length ||
*(p+1) == JVM_SIGNATURE_SLASH) {
return false;
}
} else {
return false; // do not permit '/' unless it's class name
}
break;
case JVM_SIGNATURE_SPECIAL:
case JVM_SIGNATURE_ENDSPECIAL:
// do not permit '<' or '>' in method names
if (type == ClassFileParser::LegalMethod) {
return false;
}
}
}
return true;
}
// Take pointer to a UTF8 byte string (not NUL-terminated).
// Skip over the longest part of the string that could
// be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
// Return a pointer to just past the fieldname.
// Return null if no fieldname at all was found, or in the case of slash_ok
// being true, we saw consecutive slashes (meaning we were looking for a
// qualified path but found something that was badly-formed).
static const char* skip_over_field_name(const char* const name,
bool slash_ok,
unsigned int length) {
const char* p;
jboolean last_is_slash = false;
jboolean not_first_ch = false;
for (p = name; p != name + length; not_first_ch = true) {
const char* old_p = p;
jchar ch = *p;
if (ch < 128) {
p++;
// quick check for ascii
if ((ch >= 'a' && ch <= 'z') ||
(ch >= 'A' && ch <= 'Z') ||
(ch == '_' || ch == '$') ||
(not_first_ch && ch >= '0' && ch <= '9')) {
last_is_slash = false;
continue;
}
if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
if (last_is_slash) {
return nullptr; // Don't permit consecutive slashes
}
last_is_slash = true;
continue;
}
}
else {
jint unicode_ch;
char* tmp_p = UTF8::next_character(p, &unicode_ch);
p = tmp_p;
last_is_slash = false;
// Check if ch is Java identifier start or is Java identifier part
// 4672820: call java.lang.Character methods directly without generating separate tables.
EXCEPTION_MARK;
// return value
JavaValue result(T_BOOLEAN);
// Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
JavaCallArguments args;
args.push_int(unicode_ch);
if (not_first_ch) {
// public static boolean isJavaIdentifierPart(char ch);
JavaCalls::call_static(&result,
vmClasses::Character_klass(),
vmSymbols::isJavaIdentifierPart_name(),
vmSymbols::int_bool_signature(),
&args,
THREAD);
} else {
// public static boolean isJavaIdentifierStart(char ch);
JavaCalls::call_static(&result,
vmClasses::Character_klass(),
vmSymbols::isJavaIdentifierStart_name(),
vmSymbols::int_bool_signature(),
&args,
THREAD);
}
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION;
return nullptr;
}
if(result.get_jboolean()) {
continue;
}
}
return (not_first_ch) ? old_p : nullptr;
}
return (not_first_ch && !last_is_slash) ? p : nullptr;
}
// Take pointer to a UTF8 byte string (not NUL-terminated).
// Skip over the longest part of the string that could
// be taken as a field signature. Allow "void" if void_ok.
// Return a pointer to just past the signature.
// Return null if no legal signature is found.
const char* ClassFileParser::skip_over_field_signature(const char* signature,
bool void_ok,
unsigned int length,
TRAPS) const {
unsigned int array_dim = 0;
while (length > 0) {
switch (signature[0]) {
case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
case JVM_SIGNATURE_BOOLEAN:
case JVM_SIGNATURE_BYTE:
case JVM_SIGNATURE_CHAR:
case JVM_SIGNATURE_SHORT:
case JVM_SIGNATURE_INT:
case JVM_SIGNATURE_FLOAT:
case JVM_SIGNATURE_LONG:
case JVM_SIGNATURE_DOUBLE:
return signature + 1;
case JVM_SIGNATURE_CLASS: {
if (_major_version < JAVA_1_5_VERSION) {
// Skip over the class name if one is there
const char* const p = skip_over_field_name(signature + 1, true, --length);
// The next character better be a semicolon
if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
return p + 1;
}
}
else {
// Skip leading 'L' and ignore first appearance of ';'
signature++;
const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
// Format check signature
if (c != nullptr) {
int newlen = pointer_delta_as_int(c, (char*) signature);
bool legal = verify_unqualified_name(signature, newlen, LegalClass);
if (!legal) {
classfile_parse_error("Class name is empty or contains illegal character "
"in descriptor in class file %s",
THREAD);
return nullptr;
}
return signature + newlen + 1;
}
}
return nullptr;
}
case JVM_SIGNATURE_ARRAY:
array_dim++;
if (array_dim > 255) {
// 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD);
return nullptr;
}
// The rest of what's there better be a legal signature
signature++;
length--;
void_ok = false;
break;
default:
return nullptr;
}
}
return nullptr;
}
// Checks if name is a legal class name.
void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
if (!_need_verify) { return; }
assert(name->refcount() > 0, "symbol must be kept alive");
char* bytes = (char*)name->bytes();
unsigned int length = name->utf8_length();
bool legal = false;
if (length > 0) {
const char* p;
if (bytes[0] == JVM_SIGNATURE_ARRAY) {
p = skip_over_field_signature(bytes, false, length, CHECK);
legal = (p != nullptr) && ((p - bytes) == (int)length);
} else if (_major_version < JAVA_1_5_VERSION) {
if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
p = skip_over_field_name(bytes, true, length);
legal = (p != nullptr) && ((p - bytes) == (int)length);
}
} else {
// 4900761: relax the constraints based on JSR202 spec
// Class names may be drawn from the entire Unicode character set.
// Identifiers between '/' must be unqualified names.
// The utf8 string has been verified when parsing cpool entries.
legal = verify_unqualified_name(bytes, length, LegalClass);
}
}
if (!legal) {
ResourceMark rm(THREAD);
assert(_class_name != nullptr, "invariant");
// Names are all known to be < 64k so we know this formatted message is not excessively large.
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_ClassFormatError(),
"Illegal class name \"%.*s\" in class file %s", length, bytes,
_class_name->as_C_string()
);
return;
}
}
// Checks if name is a legal field name.
void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
if (!_need_verify) { return; }
char* bytes = (char*)name->bytes();
unsigned int length = name->utf8_length();
bool legal = false;
if (length > 0) {
if (_major_version < JAVA_1_5_VERSION) {
if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
const char* p = skip_over_field_name(bytes, false, length);
legal = (p != nullptr) && ((p - bytes) == (int)length);
}
} else {
// 4881221: relax the constraints based on JSR202 spec
legal = verify_unqualified_name(bytes, length, LegalField);
}
}
if (!legal) {
ResourceMark rm(THREAD);
assert(_class_name != nullptr, "invariant");
// Names are all known to be < 64k so we know this formatted message is not excessively large.
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_ClassFormatError(),
"Illegal field name \"%.*s\" in class %s", length, bytes,
_class_name->as_C_string()
);
return;
}
}
// Checks if name is a legal method name.
void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
if (!_need_verify) { return; }
assert(name != nullptr, "method name is null");
char* bytes = (char*)name->bytes();
unsigned int length = name->utf8_length();
bool legal = false;
if (length > 0) {
if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
legal = true;
}
} else if (_major_version < JAVA_1_5_VERSION) {
const char* p;
p = skip_over_field_name(bytes, false, length);
legal = (p != nullptr) && ((p - bytes) == (int)length);
} else {
// 4881221: relax the constraints based on JSR202 spec
legal = verify_unqualified_name(bytes, length, LegalMethod);
}
}
if (!legal) {
ResourceMark rm(THREAD);
assert(_class_name != nullptr, "invariant");
// Names are all known to be < 64k so we know this formatted message is not excessively large.
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_ClassFormatError(),
"Illegal method name \"%.*s\" in class %s", length, bytes,
_class_name->as_C_string()
);
return;
}
}
// Checks if signature is a legal field signature.
void ClassFileParser::verify_legal_field_signature(const Symbol* name,
const Symbol* signature,
TRAPS) const {
if (!_need_verify) { return; }
const char* const bytes = (const char*)signature->bytes();
const unsigned int length = signature->utf8_length();
const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
if (p == nullptr || (p - bytes) != (int)length) {
throwIllegalSignature("Field", name, signature, CHECK);
}
}
// Check that the signature is compatible with the method name. For example,
// check that <init> has a void signature.
void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
const Symbol* signature,
TRAPS) const {
if (!_need_verify) {
return;
}
// Class initializers cannot have args for class format version >= 51.
if (name == vmSymbols::class_initializer_name() &&
signature != vmSymbols::void_method_signature() &&
_major_version >= JAVA_7_VERSION) {
throwIllegalSignature("Method", name, signature, THREAD);
return;
}
int sig_length = signature->utf8_length();
if (name->utf8_length() > 0 &&
name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
sig_length > 0 &&
signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
throwIllegalSignature("Method", name, signature, THREAD);
}
}
// Checks if signature is a legal method signature.
// Returns number of parameters
int ClassFileParser::verify_legal_method_signature(const Symbol* name,
const Symbol* signature,
TRAPS) const {
if (!_need_verify) {
// make sure caller's args_size will be less than 0 even for non-static
// method so it will be recomputed in compute_size_of_parameters().
return -2;
}
unsigned int args_size = 0;
const char* p = (const char*)signature->bytes();
unsigned int length = signature->utf8_length();
const char* nextp;
// The first character must be a '('
if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
length--;
// Skip over legal field signatures
nextp = skip_over_field_signature(p, false, length, CHECK_0);
while ((length > 0) && (nextp != nullptr)) {
args_size++;
if (p[0] == 'J' || p[0] == 'D') {
args_size++;
}
length -= pointer_delta_as_int(nextp, p);
p = nextp;
nextp = skip_over_field_signature(p, false, length, CHECK_0);
}
// The first non-signature thing better be a ')'
if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
length--;
// Now we better just have a return value
nextp = skip_over_field_signature(p, true, length, CHECK_0);
if (nextp && ((int)length == (nextp - p))) {
return args_size;
}
}
}
// Report error
throwIllegalSignature("Method", name, signature, THREAD);
return 0;
}
int ClassFileParser::static_field_size() const {
assert(_field_info != nullptr, "invariant");
return _field_info->_static_field_size;
}
int ClassFileParser::total_oop_map_count() const {
assert(_field_info != nullptr, "invariant");
return _field_info->oop_map_blocks->_nonstatic_oop_map_count;
}
jint ClassFileParser::layout_size() const {
assert(_field_info != nullptr, "invariant");
return _field_info->_instance_size;
}
static void check_methods_for_intrinsics(const InstanceKlass* ik,
const Array<Method*>* methods) {
assert(ik != nullptr, "invariant");
assert(methods != nullptr, "invariant");
// Set up Method*::intrinsic_id as soon as we know the names of methods.
// (We used to do this lazily, but now we query it in Rewriter,
// which is eagerly done for every method, so we might as well do it now,
// when everything is fresh in memory.)
const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
if (klass_id != vmSymbolID::NO_SID) {
for (int j = 0; j < methods->length(); ++j) {
Method* method = methods->at(j);
method->init_intrinsic_id(klass_id);
if (CheckIntrinsics) {
// Check if an intrinsic is defined for method 'method',
// but the method is not annotated with @IntrinsicCandidate.
if (method->intrinsic_id() != vmIntrinsics::_none &&
!method->intrinsic_candidate()) {
tty->print("Compiler intrinsic is defined for method [%s], "
"but the method is not annotated with @IntrinsicCandidate.%s",
method->name_and_sig_as_C_string(),
NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
);
tty->cr();
DEBUG_ONLY(vm_exit(1));
}
// Check is the method 'method' is annotated with @IntrinsicCandidate,
// but there is no intrinsic available for it.
if (method->intrinsic_candidate() &&
method->intrinsic_id() == vmIntrinsics::_none) {
tty->print("Method [%s] is annotated with @IntrinsicCandidate, "
"but no compiler intrinsic is defined for the method.%s",
method->name_and_sig_as_C_string(),
NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
);
tty->cr();
DEBUG_ONLY(vm_exit(1));
}
}
} // end for
#ifdef ASSERT
if (CheckIntrinsics) {
// Check for orphan methods in the current class. A method m
// of a class C is orphan if an intrinsic is defined for method m,
// but class C does not declare m.
// The check is potentially expensive, therefore it is available
// only in debug builds.
for (auto id : EnumRange<vmIntrinsicID>{}) {
if (vmIntrinsics::_compiledLambdaForm == id) {
// The _compiledLamdbdaForm intrinsic is a special marker for bytecode
// generated for the JVM from a LambdaForm and therefore no method
// is defined for it.
continue;
}
if (vmIntrinsics::_blackhole == id) {
// The _blackhole intrinsic is a special marker. No explicit method
// is defined for it.
continue;
}
if (vmIntrinsics::class_for(id) == klass_id) {
// Check if the current class contains a method with the same
// name, flags, signature.
bool match = false;
for (int j = 0; j < methods->length(); ++j) {
const Method* method = methods->at(j);
if (method->intrinsic_id() == id) {
match = true;
break;
}
}
if (!match) {
char buf[1000];
tty->print("Compiler intrinsic is defined for method [%s], "
"but the method is not available in class [%s].%s",
vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)),
ik->name()->as_C_string(),
NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
);
tty->cr();
DEBUG_ONLY(vm_exit(1));
}
}
} // end for
} // CheckIntrinsics
#endif // ASSERT
}
}
InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
const ClassInstanceInfo& cl_inst_info,
TRAPS) {
if (_klass != nullptr) {
return _klass;
}
InstanceKlass* const ik =
InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
if (is_hidden()) {
mangle_hidden_class_name(ik);
}
fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
assert(_klass == ik, "invariant");
return ik;
}
void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
bool changed_by_loadhook,
const ClassInstanceInfo& cl_inst_info,
TRAPS) {
assert(ik != nullptr, "invariant");
// Set name and CLD before adding to CLD
ik->set_class_loader_data(_loader_data);
ik->set_class_loader_type();
ik->set_name(_class_name);
// Add all classes to our internal class loader list here,
// including classes in the bootstrap (null) class loader.
const bool publicize = !is_internal();
_loader_data->add_class(ik, publicize);
set_klass_to_deallocate(ik);
assert(_field_info != nullptr, "invariant");
assert(ik->static_field_size() == _field_info->_static_field_size, "sanity");
assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count,
"sanity");
assert(ik->is_instance_klass(), "sanity");
assert(ik->size_helper() == _field_info->_instance_size, "sanity");
// Fill in information already parsed
ik->set_should_verify_class(_need_verify);
// Not yet: supers are done below to support the new subtype-checking fields
ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size);
ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields);
ik->set_static_oop_field_count(_static_oop_count);
// this transfers ownership of a lot of arrays from
// the parser onto the InstanceKlass*
apply_parsed_class_metadata(ik, _java_fields_count);
// can only set dynamic nest-host after static nest information is set
if (cl_inst_info.dynamic_nest_host() != nullptr) {
ik->set_nest_host(cl_inst_info.dynamic_nest_host());
}
// note that is not safe to use the fields in the parser from this point on
assert(nullptr == _cp, "invariant");
assert(nullptr == _fieldinfo_stream, "invariant");
assert(nullptr == _fieldinfo_search_table, "invariant");
assert(nullptr == _fields_status, "invariant");
assert(nullptr == _methods, "invariant");
assert(nullptr == _inner_classes, "invariant");
assert(nullptr == _nest_members, "invariant");
assert(nullptr == _combined_annotations, "invariant");
assert(nullptr == _record_components, "invariant");
assert(nullptr == _permitted_subclasses, "invariant");
if (_has_localvariable_table) {
ik->set_has_localvariable_table(true);
}
if (_has_final_method) {
ik->set_has_final_method();
}
ik->copy_method_ordering(_method_ordering, CHECK);
// The InstanceKlass::_methods_jmethod_ids cache
// is managed on the assumption that the initial cache
// size is equal to the number of methods in the class. If
// that changes, then InstanceKlass::idnum_can_increment()
// has to be changed accordingly.
ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
ik->set_this_class_index(_this_class_index);
if (_is_hidden) {
// _this_class_index is a CONSTANT_Class entry that refers to this
// hidden class itself. If this class needs to refer to its own methods
// or fields, it would use a CONSTANT_MethodRef, etc, which would reference
// _this_class_index. However, because this class is hidden (it's
// not stored in SystemDictionary), _this_class_index cannot be resolved
// with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
// Therefore, we must eagerly resolve _this_class_index now.
ik->constants()->klass_at_put(_this_class_index, ik);
}
ik->set_minor_version(_minor_version);
ik->set_major_version(_major_version);
ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
assert(!_is_hidden || ik->is_hidden(), "must be set already");
// Set PackageEntry for this_klass
oop cl = ik->class_loader();
Handle clh = Handle(THREAD, cl);
ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
ik->set_package(cld, nullptr, CHECK);
const Array<Method*>* const methods = ik->methods();
assert(methods != nullptr, "invariant");
const int methods_len = methods->length();
check_methods_for_intrinsics(ik, methods);
// Fill in field values obtained by parse_classfile_attributes
if (_parsed_annotations->has_any_annotations()) {
_parsed_annotations->apply_to(ik);
}
apply_parsed_class_attributes(ik);
// Miranda methods
if ((_num_miranda_methods > 0) ||
// if this class introduced new miranda methods or
(_super_klass != nullptr && _super_klass->has_miranda_methods())
// super class exists and this class inherited miranda methods
) {
ik->set_has_miranda_methods(); // then set a flag
}
// Fill in information needed to compute superclasses.
ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
ik->set_transitive_interfaces(_transitive_interfaces);
ik->set_local_interfaces(_local_interfaces);
_transitive_interfaces = nullptr;
_local_interfaces = nullptr;
// Initialize itable offset tables
klassItable::setup_itable_offset_table(ik);
// Compute transitive closure of interfaces this class implements
// Do final class setup
OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
}
if (_has_contended_fields || _parsed_annotations->is_contended() ||
( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
ik->set_has_contended_annotations(true);
}
// Fill in has_finalizer and layout_helper
set_precomputed_flags(ik);
// check if this class can access its super class
check_super_class_access(ik, CHECK);
// check if this class can access its superinterfaces
check_super_interface_access(ik, CHECK);
// check if this class overrides any final method
check_final_method_override(ik, CHECK);
// reject static interface methods prior to Java 8
if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
check_illegal_static_method(ik, CHECK);
}
// Obtain this_klass' module entry
ModuleEntry* module_entry = ik->module();
assert(module_entry != nullptr, "module_entry should always be set");
// Obtain java.lang.Module
Handle module_handle(THREAD, module_entry->module());
// Allocate mirror and initialize static fields
java_lang_Class::create_mirror(ik,
Handle(THREAD, _loader_data->class_loader()),
module_handle,
_protection_domain,
cl_inst_info.class_data(),
CHECK);
assert(_all_mirandas != nullptr, "invariant");
// Generate any default methods - default methods are public interface methods
// that have a default implementation. This is new with Java 8.
if (_has_nonstatic_concrete_methods) {
DefaultMethods::generate_default_methods(ik,
_all_mirandas,
CHECK);
}
// Add read edges to the unnamed modules of the bootstrap and app class loaders.
if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
!module_entry->has_default_read_edges()) {
if (!module_entry->set_has_default_read_edges()) {
// We won a potential race
JvmtiExport::add_default_read_edges(module_handle, THREAD);
}
}
ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
if (!is_internal()) {
ik->print_class_load_logging(_loader_data, module_entry, _stream);
if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
log_is_enabled(Info, class, preview)) {
ResourceMark rm;
log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
}
if (log_is_enabled(Debug, class, resolve)) {
ResourceMark rm;
// print out the superclass.
const char * from = ik->external_name();
if (ik->java_super() != nullptr) {
log_debug(class, resolve)("%s %s (super)",
from,
ik->java_super()->external_name());
}
// print out each of the interface classes referred to by this class.
const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
if (local_interfaces != nullptr) {
const int length = local_interfaces->length();
for (int i = 0; i < length; i++) {
const InstanceKlass* const k = local_interfaces->at(i);
const char * to = k->external_name();
log_debug(class, resolve)("%s %s (interface)", from, to);
}
}
}
}
JFR_ONLY(INIT_ID(ik);)
// If we reach here, all is well.
// Now remove the InstanceKlass* from the _klass_to_deallocate field
// in order for it to not be destroyed in the ClassFileParser destructor.
set_klass_to_deallocate(nullptr);
// it's official
set_klass(ik);
DEBUG_ONLY(ik->verify();)
}
void ClassFileParser::update_class_name(Symbol* new_class_name) {
// Decrement the refcount in the old name, since we're clobbering it.
_class_name->decrement_refcount();
_class_name = new_class_name;
// Increment the refcount of the new name.
// Now the ClassFileParser owns this name and will decrement in
// the destructor.
_class_name->increment_refcount();
}
ClassFileParser::ClassFileParser(ClassFileStream* stream,
Symbol* name,
ClassLoaderData* loader_data,
const ClassLoadInfo* cl_info,
Publicity pub_level,
TRAPS) :
_stream(stream),
_class_name(nullptr),
_loader_data(loader_data),
_is_hidden(cl_info->is_hidden()),
_can_access_vm_annotations(cl_info->can_access_vm_annotations()),
_orig_cp_size(0),
_static_oop_count(0),
_super_klass(),
_cp(nullptr),
_fieldinfo_stream(nullptr),
_fieldinfo_search_table(nullptr),
_fields_status(nullptr),
_methods(nullptr),
_inner_classes(nullptr),
_nest_members(nullptr),
_nest_host(0),
_permitted_subclasses(nullptr),
_record_components(nullptr),
_local_interfaces(nullptr),
_transitive_interfaces(nullptr),
_combined_annotations(nullptr),
_class_annotations(nullptr),
_class_type_annotations(nullptr),
_fields_annotations(nullptr),
_fields_type_annotations(nullptr),
_klass(nullptr),
_klass_to_deallocate(nullptr),
_parsed_annotations(nullptr),
_field_info(nullptr),
_temp_field_info(nullptr),
_method_ordering(nullptr),
_all_mirandas(nullptr),
_vtable_size(0),
_itable_size(0),
_num_miranda_methods(0),
_protection_domain(cl_info->protection_domain()),
_access_flags(),
_pub_level(pub_level),
_bad_constant_seen(0),
_synthetic_flag(false),
_sde_length(false),
_sde_buffer(nullptr),
_sourcefile_index(0),
_generic_signature_index(0),
_major_version(0),
_minor_version(0),
_this_class_index(0),
_super_class_index(0),
_itfs_len(0),
_java_fields_count(0),
_need_verify(false),
_has_nonstatic_concrete_methods(false),
_declares_nonstatic_concrete_methods(false),
_has_localvariable_table(false),
_has_final_method(false),
_has_contended_fields(false),
_has_finalizer(false),
_has_empty_finalizer(false),
_max_bootstrap_specifier_index(-1) {
_class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
_class_name->increment_refcount();
assert(_loader_data != nullptr, "invariant");
assert(stream != nullptr, "invariant");
assert(_stream != nullptr, "invariant");
assert(_stream->buffer() == _stream->current(), "invariant");
assert(_class_name != nullptr, "invariant");
assert(0 == _access_flags.as_unsigned_short(), "invariant");
// Figure out whether we can skip format checking (matching classic VM behavior)
// Always verify CFLH bytes from the user agents.
_need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader());
// synch back verification state to stream to check for truncation.
stream->set_need_verify(_need_verify);
parse_stream(stream, CHECK);
post_process_parsed_stream(stream, _cp, CHECK);
}
void ClassFileParser::clear_class_metadata() {
// metadata created before the instance klass is created. Must be
// deallocated if classfile parsing returns an error.
_cp = nullptr;
_fieldinfo_stream = nullptr;
_fieldinfo_search_table = nullptr;
_fields_status = nullptr;
_methods = nullptr;
_inner_classes = nullptr;
_nest_members = nullptr;
_permitted_subclasses = nullptr;
_combined_annotations = nullptr;
_class_annotations = _class_type_annotations = nullptr;
_fields_annotations = _fields_type_annotations = nullptr;
_record_components = nullptr;
}
// Destructor to clean up
ClassFileParser::~ClassFileParser() {
_class_name->decrement_refcount();
if (_cp != nullptr) {
MetadataFactory::free_metadata(_loader_data, _cp);
}
if (_fieldinfo_stream != nullptr) {
MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
}
MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_search_table);
if (_fields_status != nullptr) {
MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
}
if (_methods != nullptr) {
// Free methods
InstanceKlass::deallocate_methods(_loader_data, _methods);
}
// beware of the Universe::empty_blah_array!!
if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
}
if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
MetadataFactory::free_array<u2>(_loader_data, _nest_members);
}
if (_record_components != nullptr) {
InstanceKlass::deallocate_record_components(_loader_data, _record_components);
}
if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
}
// Free interfaces
InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
_local_interfaces, _transitive_interfaces);
if (_combined_annotations != nullptr) {
// After all annotations arrays have been created, they are installed into the
// Annotations object that will be assigned to the InstanceKlass being created.
// Deallocate the Annotations object and the installed annotations arrays.
_combined_annotations->deallocate_contents(_loader_data);
// If the _combined_annotations pointer is non-null,
// then the other annotations fields should have been cleared.
assert(_class_annotations == nullptr, "Should have been cleared");
assert(_class_type_annotations == nullptr, "Should have been cleared");
assert(_fields_annotations == nullptr, "Should have been cleared");
assert(_fields_type_annotations == nullptr, "Should have been cleared");
} else {
// If the annotations arrays were not installed into the Annotations object,
// then they have to be deallocated explicitly.
MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
Annotations::free_contents(_loader_data, _fields_annotations);
Annotations::free_contents(_loader_data, _fields_type_annotations);
}
clear_class_metadata();
_transitive_interfaces = nullptr;
_local_interfaces = nullptr;
// deallocate the klass if already created. Don't directly deallocate, but add
// to the deallocate list so that the klass is removed from the CLD::_klasses list
// at a safepoint.
if (_klass_to_deallocate != nullptr) {
_loader_data->add_to_deallocate_list(_klass_to_deallocate);
}
}
void ClassFileParser::parse_stream(const ClassFileStream* const stream,
TRAPS) {
assert(stream != nullptr, "invariant");
assert(_class_name != nullptr, "invariant");
// BEGIN STREAM PARSING
stream->guarantee_more(8, CHECK); // magic, major, minor
// Magic value
const u4 magic = stream->get_u4_fast();
guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
"Incompatible magic value %u in class file %s",
magic, CHECK);
// Version numbers
_minor_version = stream->get_u2_fast();
_major_version = stream->get_u2_fast();
// Check version numbers - we check this even with verifier off
verify_class_version(_major_version, _minor_version, _class_name, CHECK);
stream->guarantee_more(3, CHECK); // length, first cp tag
u2 cp_size = stream->get_u2_fast();
guarantee_property(
cp_size >= 1, "Illegal constant pool size %u in class file %s",
cp_size, CHECK);
_orig_cp_size = cp_size;
if (is_hidden()) { // Add a slot for hidden class name.
cp_size++;
}
_cp = ConstantPool::allocate(_loader_data,
cp_size,
CHECK);
ConstantPool* const cp = _cp;
parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
assert(cp_size == (u2)cp->length(), "invariant");
// ACCESS FLAGS
stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
// Access flags
u2 flags;
// JVM_ACC_MODULE is defined in JDK-9 and later.
if (_major_version >= JAVA_9_VERSION) {
flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
} else {
flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
}
if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
// Set abstract bit for old class files for backward compatibility
flags |= JVM_ACC_ABSTRACT;
}
verify_legal_class_modifiers(flags, CHECK);
short bad_constant = class_bad_constant_seen();
if (bad_constant != 0) {
// Do not throw CFE until after the access_flags are checked because if
// ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
return;
}
_access_flags.set_flags(flags);
// This class and superclass
_this_class_index = stream->get_u2_fast();
guarantee_property(
valid_cp_range(_this_class_index, cp_size) &&
cp->tag_at(_this_class_index).is_unresolved_klass(),
"Invalid this class index %u in constant pool in class file %s",
_this_class_index, CHECK);
Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
assert(class_name_in_cp != nullptr, "class_name can't be null");
// Don't need to check whether this class name is legal or not.
// It has been checked when constant pool is parsed.
// However, make sure it is not an array type.
if (_need_verify) {
guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
"Bad class name in class file %s",
CHECK);
}
#ifdef ASSERT
// Basic sanity checks
if (_is_hidden) {
assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
}
#endif
// Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
if (_is_hidden) {
assert(_class_name != nullptr, "Unexpected null _class_name");
#ifdef ASSERT
if (_need_verify) {
verify_legal_class_name(_class_name, CHECK);
}
#endif
} else {
// Check if name in class file matches given name
if (_class_name != class_name_in_cp) {
if (_class_name != vmSymbols::unknown_class_name()) {
ResourceMark rm(THREAD);
// Names are all known to be < 64k so we know this formatted message is not excessively large.
Exceptions::fthrow(THREAD_AND_LOCATION,
vmSymbols::java_lang_NoClassDefFoundError(),
"%s (wrong name: %s)",
_class_name->as_C_string(),
class_name_in_cp->as_C_string()
);
return;
} else {
// The class name was not known by the caller so we set it from
// the value in the CP.
update_class_name(class_name_in_cp);
}
// else nothing to do: the expected class name matches what is in the CP
}
}
// Verification prevents us from creating names with dots in them, this
// asserts that that's the case.
assert(is_internal_format(_class_name), "external class name format used internally");
if (!is_internal()) {
LogTarget(Debug, class, preorder) lt;
if (lt.is_enabled()){
ResourceMark rm(THREAD);
LogStream ls(lt);
ls.print("%s", _class_name->as_klass_external_name());
if (stream->source() != nullptr) {
ls.print(" source: %s", stream->source());
}
ls.cr();
}
}
// SUPERKLASS
_super_class_index = stream->get_u2_fast();
_super_klass = parse_super_class(cp,
_super_class_index,
_need_verify,
CHECK);
// Interfaces
_itfs_len = stream->get_u2_fast();
parse_interfaces(stream,
_itfs_len,
cp,
&_has_nonstatic_concrete_methods,
CHECK);
assert(_local_interfaces != nullptr, "invariant");
// Fields (offsets are filled in later)
parse_fields(stream,
_access_flags.is_interface(),
cp,
cp_size,
&_java_fields_count,
CHECK);
assert(_temp_field_info != nullptr, "invariant");
// Methods
parse_methods(stream,
_access_flags.is_interface(),
&_has_localvariable_table,
&_has_final_method,
&_declares_nonstatic_concrete_methods,
CHECK);
assert(_methods != nullptr, "invariant");
if (_declares_nonstatic_concrete_methods) {
_has_nonstatic_concrete_methods = true;
}
// Additional attributes/annotations
_parsed_annotations = new ClassAnnotationCollector();
parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
assert(_inner_classes != nullptr, "invariant");
// Finalize the Annotations metadata object,
// now that all annotation arrays have been created.
create_combined_annotations(CHECK);
// Make sure this is the end of class file stream
guarantee_property(stream->at_eos(),
"Extra bytes at the end of class file %s",
CHECK);
// all bytes in stream read and parsed
}
void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) {
ResourceMark rm;
// Construct hidden name from _class_name, "+", and &ik. Note that we can't
// use a '/' because that confuses finding the class's package. Also, can't
// use an illegal char such as ';' because that causes serialization issues
// and issues with hidden classes that create their own hidden classes.
char addr_buf[20];
if (CDSConfig::is_dumping_static_archive()) {
// We want stable names for the archived hidden classes (only for static
// archive for now). Spaces under default_SharedBaseAddress() will be
// occupied by the archive at run time, so we know that no dynamically
// loaded InstanceKlass will be placed under there.
static volatile size_t counter = 0;
Atomic::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it
size_t new_id = Atomic::add(&counter, (size_t)1);
jio_snprintf(addr_buf, 20, "0x%zx", new_id);
} else {
jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik));
}
size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf);
char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len);
jio_snprintf(new_name, new_name_len, "%s+%s",
_class_name->as_C_string(), addr_buf);
update_class_name(SymbolTable::new_symbol(new_name));
// Add a Utf8 entry containing the hidden name.
assert(_class_name != nullptr, "Unexpected null _class_name");
int hidden_index = _orig_cp_size; // this is an extra slot we added
_cp->symbol_at_put(hidden_index, _class_name);
// Update this_class_index's slot in the constant pool with the new Utf8 entry.
// We have to update the resolved_klass_index and the name_index together
// so extract the existing resolved_klass_index first.
CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
int resolved_klass_index = cp_klass_slot.resolved_klass_index();
_cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
"Bad name_index");
}
void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
ConstantPool* cp,
TRAPS) {
assert(stream != nullptr, "invariant");
assert(stream->at_eos(), "invariant");
assert(cp != nullptr, "invariant");
assert(_loader_data != nullptr, "invariant");
if (_class_name == vmSymbols::java_lang_Object()) {
guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
"java.lang.Object cannot implement an interface in class file %s",
CHECK);
}
// We check super class after class file is parsed and format is checked
if (_super_class_index > 0 && nullptr == _super_klass) {
Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
if (_access_flags.is_interface()) {
// Before attempting to resolve the superclass, check for class format
// errors not checked yet.
guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
"Interfaces must have java.lang.Object as superclass in class file %s",
CHECK);
}
Handle loader(THREAD, _loader_data->class_loader());
if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
_super_klass = vmClasses::Object_klass();
} else {
_super_klass = (const InstanceKlass*)
SystemDictionary::resolve_super_or_fail(_class_name,
super_class_name,
loader,
true,
CHECK);
}
}
if (_super_klass != nullptr) {
if (_super_klass->has_nonstatic_concrete_methods()) {
_has_nonstatic_concrete_methods = true;
}
if (_super_klass->is_interface()) {
classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
return;
}
}
// Compute the transitive list of all unique interfaces implemented by this class
_transitive_interfaces =
compute_transitive_interfaces(_super_klass,
_local_interfaces,
_loader_data,
CHECK);
assert(_transitive_interfaces != nullptr, "invariant");
// sort methods
_method_ordering = sort_methods(_methods);
_all_mirandas = new GrowableArray<Method*>(20);
Handle loader(THREAD, _loader_data->class_loader());
klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
&_num_miranda_methods,
_all_mirandas,
_super_klass,
_methods,
_access_flags,
_major_version,
loader,
_class_name,
_local_interfaces);
// Size of Java itable (in words)
_itable_size = _access_flags.is_interface() ? 0 :
klassItable::compute_itable_size(_transitive_interfaces);
assert(_parsed_annotations != nullptr, "invariant");
_field_info = new FieldLayoutInfo();
FieldLayoutBuilder lb(class_name(), super_klass(), _cp, /*_fields*/ _temp_field_info,
_parsed_annotations->is_contended(), _field_info);
lb.build_layout();
int injected_fields_count = _temp_field_info->length() - _java_fields_count;
_fieldinfo_stream =
FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
injected_fields_count, loader_data(), CHECK);
_fieldinfo_search_table = FieldInfoStream::create_search_table(_cp, _fieldinfo_stream, _loader_data, CHECK);
_fields_status =
MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
FieldStatus(0), CHECK);
}
void ClassFileParser::set_klass(InstanceKlass* klass) {
#ifdef ASSERT
if (klass != nullptr) {
assert(nullptr == _klass, "leaking?");
}
#endif
_klass = klass;
}
void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
#ifdef ASSERT
if (klass != nullptr) {
assert(nullptr == _klass_to_deallocate, "leaking?");
}
#endif
_klass_to_deallocate = klass;
}
// Caller responsible for ResourceMark
// clone stream with rewound position
const ClassFileStream* ClassFileParser::clone_stream() const {
assert(_stream != nullptr, "invariant");
return _stream->clone();
}
ReferenceType ClassFileParser::super_reference_type() const {
return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type();
}
bool ClassFileParser::is_instance_ref_klass() const {
// Only the subclasses of j.l.r.Reference are InstanceRefKlass.
// j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a
// klass requiring special treatment in ref-processing. The abstract
// j.l.r.Reference cannot be instantiated so doesn't partake in
// ref-processing.
return is_java_lang_ref_Reference_subclass();
}
bool ClassFileParser::is_java_lang_ref_Reference_subclass() const {
if (_super_klass == nullptr) {
return false;
}
if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) {
// Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom
return true;
}
return _super_klass->reference_type() != REF_NONE;
}
// ----------------------------------------------------------------------------
// debugging
#ifdef ASSERT
// return true if class_name contains no '.' (internal format is '/')
bool ClassFileParser::is_internal_format(Symbol* class_name) {
if (class_name != nullptr) {
ResourceMark rm;
char* name = class_name->as_C_string();
return strchr(name, JVM_SIGNATURE_DOT) == nullptr;
} else {
return true;
}
}
#endif