src/hotspot/cpu/ppc/interp_masm_ppc.hpp

/*
 * Copyright (c) 2002, 2025, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2012, 2025 SAP SE. 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.
 *
 */

#ifndef CPU_PPC_INTERP_MASM_PPC_HPP
#define CPU_PPC_INTERP_MASM_PPC_HPP

#include "asm/macroAssembler.hpp"
#include "interpreter/invocationCounter.hpp"

// This file specializes the assembler with interpreter-specific macros.


class InterpreterMacroAssembler: public MacroAssembler {

 public:
  InterpreterMacroAssembler(CodeBuffer* code) : MacroAssembler(code) {}

  void null_check_throw(Register a, int offset, Register temp_reg);
  void load_klass_check_null_throw(Register dst, Register src, Register temp_reg);

  void jump_to_entry(address entry, Register Rscratch);

  // Handy address generation macros.
#define thread_(field_name) in_bytes(JavaThread::field_name ## _offset()), R16_thread
#define method_(field_name) in_bytes(Method::field_name ## _offset()), R19_method

  virtual void check_and_handle_popframe(Register scratch_reg);
  virtual void check_and_handle_earlyret(Register scratch_reg);

  void call_VM_preemptable(Register oop_result, address entry_point, Register arg_1, bool check_exceptions = true);
  void restore_after_resume(Register fp);
  // R22 and R31 are preserved when a vthread gets preempted in the interpreter.
  // The interpreter already assumes that these registers are nonvolatile across native calls.
  bool nonvolatile_accross_vthread_preemtion(Register r) const {
    return r->is_nonvolatile() && ((r == R22) || (r == R31));
  }

  // Base routine for all dispatches.
  void dispatch_base(TosState state, address* table);

  void load_earlyret_value(TosState state, Register Rscratch1);

  static const Address l_tmp;
  static const Address d_tmp;

  // dispatch routines
  void dispatch_next(TosState state, int step = 0, bool generate_poll = false);
  void dispatch_via (TosState state, address* table);
  void load_dispatch_table(Register dst, address* table);
  void dispatch_Lbyte_code(TosState state, Register bytecode, address* table, bool generate_poll = false);

  // Called by shared interpreter generator.
  void dispatch_prolog(TosState state, int step = 0);
  void dispatch_epilog(TosState state, int step = 0);

  // Super call_VM calls - correspond to MacroAssembler::call_VM(_leaf) calls.
  void super_call_VM_leaf(Register thread_cache, address entry_point, Register arg_1);
  void super_call_VM(Register thread_cache, Register oop_result, Register last_java_sp,
                     address entry_point, Register arg_1, Register arg_2, bool check_exception = true);

  // Generate a subtype check: branch to ok_is_subtype if sub_klass is
  // a subtype of super_klass.  Blows registers tmp1, tmp2 and tmp3.
  void gen_subtype_check(Register sub_klass, Register super_klass,
                         Register tmp1, Register tmp2, Register tmp3, Label &ok_is_subtype);

  // Load object from cpool->resolved_references(index).
  void load_resolved_reference_at_index(Register result, Register index, Register tmp1, Register tmp2,
                                        Label *L_handle_null = nullptr);

  // load cpool->resolved_klass_at(index)
  void load_resolved_klass_at_offset(Register Rcpool, Register Roffset, Register Rklass);

  void load_receiver(Register Rparam_count, Register Rrecv_dst);

  // helpers for expression stack
  void pop_i(     Register r = R17_tos);
  void pop_ptr(   Register r = R17_tos);
  void pop_l(     Register r = R17_tos);
  void pop_f(FloatRegister f = F15_ftos);
  void pop_d(FloatRegister f = F15_ftos );

  void push_i(     Register r = R17_tos);
  void push_ptr(   Register r = R17_tos);
  void push_l(     Register r = R17_tos);
  void push_f(FloatRegister f = F15_ftos );
  void push_d(FloatRegister f = F15_ftos);

  void push_2ptrs(Register first, Register second);

  void move_l_to_d(Register l = R17_tos, FloatRegister d = F15_ftos);
  void move_d_to_l(FloatRegister d = F15_ftos, Register l = R17_tos);

  void pop (TosState state);           // transition vtos -> state
  void push(TosState state);           // transition state -> vtos
  void empty_expression_stack();       // Resets both Lesp and SP.

 public:
  // Load values from bytecode stream:

  enum signedOrNot { Signed, Unsigned };
  enum setCCOrNot  { set_CC, dont_set_CC };

  void get_2_byte_integer_at_bcp(int         bcp_offset,
                                 Register    Rdst,
                                 signedOrNot is_signed);

  void get_4_byte_integer_at_bcp(int         bcp_offset,
                                 Register    Rdst,
                                 signedOrNot is_signed = Unsigned);

  void get_cache_index_at_bcp(Register Rdst, int bcp_offset, size_t index_size);

  void load_resolved_indy_entry(Register cache, Register index);
  void load_field_or_method_entry(bool is_method, Register cache, Register index, int bcp_offset, bool for_fast_bytecode);
  void load_field_entry(Register cache, Register index, int bcp_offset = 1, bool for_fast_bytecode = false) {
    load_field_or_method_entry(false, cache, index, bcp_offset, for_fast_bytecode);
  }
  void load_method_entry(Register cache, Register index, int bcp_offset = 1, bool for_fast_bytecode = false) {
    load_field_or_method_entry(true, cache, index, bcp_offset, for_fast_bytecode);
  }

  void get_u4(Register Rdst, Register Rsrc, int offset, signedOrNot is_signed);

  // common code

  void field_offset_at(int n, Register tmp, Register dest, Register base);
  int  field_offset_at(Register object, address bcp, int offset);
  void fast_iaaccess(int n, address bcp);
  void fast_iaputfield(address bcp, bool do_store_check);

  void index_check(Register array, Register index, int index_shift, Register tmp, Register res);
  void index_check_without_pop(Register array, Register index, int index_shift, Register tmp, Register res);

  void get_const(Register Rdst);
  void get_constant_pool(Register Rdst);
  void get_constant_pool_cache(Register Rdst);
  void get_cpool_and_tags(Register Rcpool, Register Rtags);
  void is_a(Label& L);

  void narrow(Register result);

  // Java Call Helpers
  void call_from_interpreter(Register Rtarget_method, Register Rret_addr, Register Rscratch1, Register Rscratch2);

  // --------------------------------------------------

  void unlock_if_synchronized_method(TosState state, bool throw_monitor_exception = true,
                                     bool install_monitor_exception = true);

  // Removes the current activation (incl. unlocking of monitors).
  // Additionally this code is used for earlyReturn in which case we
  // want to skip throwing an exception and installing an exception.
  void remove_activation(TosState state,
                         bool throw_monitor_exception = true,
                         bool install_monitor_exception = true);
  JFR_ONLY(void enter_jfr_critical_section();)
  JFR_ONLY(void leave_jfr_critical_section();)
  void load_fp(Register fp);
  void remove_top_frame_given_fp(Register fp, Register sender_sp, Register sender_fp, Register return_pc, Register temp);
  void merge_frames(Register sender_sp, Register return_pc, Register temp1, Register temp2); // merge top frames

  void add_monitor_to_stack(bool stack_is_empty, Register Rtemp1, Register Rtemp2);

  // Local variable access helpers
  void load_local_int(Register Rdst_value, Register Rdst_address, Register Rindex);
  void load_local_long(Register Rdst_value, Register Rdst_address, Register Rindex);
  void load_local_ptr(Register Rdst_value, Register Rdst_address, Register Rindex);
  void load_local_float(FloatRegister Rdst_value, Register Rdst_address, Register Rindex);
  void load_local_double(FloatRegister Rdst_value, Register Rdst_address, Register Rindex);
  void store_local_int(Register Rvalue, Register Rindex);
  void store_local_long(Register Rvalue, Register Rindex);
  void store_local_ptr(Register Rvalue, Register Rindex);
  void store_local_float(FloatRegister Rvalue, Register Rindex);
  void store_local_double(FloatRegister Rvalue, Register Rindex);

  // Call VM for std frames
  // Special call VM versions that check for exceptions and forward exception
  // via short cut (not via expensive forward exception stub).
  void check_and_forward_exception(Register Rscratch1, Register Rscratch2);
  void call_VM(Register oop_result, address entry_point, bool check_exceptions = true, Label* last_java_pc = nullptr);
  void call_VM(Register oop_result, address entry_point, Register arg_1, bool check_exceptions = true);
  void call_VM(Register oop_result, address entry_point, Register arg_1, Register arg_2, bool check_exceptions = true);
  void call_VM(Register oop_result, address entry_point, Register arg_1, Register arg_2, Register arg_3, bool check_exceptions = true);
  // Should not be used:
  void call_VM(Register oop_result, Register last_java_sp, address entry_point, bool check_exceptions = true) {ShouldNotReachHere();}
  void call_VM(Register oop_result, Register last_java_sp, address entry_point, Register arg_1, bool check_exceptions = true) {ShouldNotReachHere();}
  void call_VM(Register oop_result, Register last_java_sp, address entry_point, Register arg_1, Register arg_2, bool check_exceptions = true) {ShouldNotReachHere();}
  void call_VM(Register oop_result, Register last_java_sp, address entry_point, Register arg_1, Register arg_2, Register arg_3, bool check_exceptions = true) {ShouldNotReachHere();}

  Address first_local_in_stack();

  enum LoadOrStore { load, store };
  void static_iload_or_store(int which_local, LoadOrStore direction, Register Rtmp);
  void static_aload_or_store(int which_local, LoadOrStore direction, Register Rtmp);
  void static_dload_or_store(int which_local, LoadOrStore direction);

  void save_interpreter_state(Register scratch);
  void restore_interpreter_state(Register scratch, bool bcp_and_mdx_only = false, bool restore_top_frame_sp = false);

  void increment_backedge_counter(const Register Rcounters, Register Rtmp, Register Rtmp2, Register Rscratch);

  void record_static_call_in_profile(Register Rentry, Register Rtmp);
  void record_receiver_call_in_profile(Register Rklass, Register Rentry, Register Rtmp);

  void get_method_counters(Register method, Register Rcounters, Label& skip);
  void increment_invocation_counter(Register iv_be_count, Register Rtmp1, Register Rtmp2_r0);

  // Object locking
  void lock_object  (Register lock_reg, Register obj_reg);
  void unlock_object(Register lock_reg);

  // Interpreter profiling operations
  void set_method_data_pointer_for_bcp();
  void test_method_data_pointer(Label& zero_continue);
  void verify_method_data_pointer();

  void set_mdp_data_at(int constant, Register value);

  void increment_mdp_data_at(int constant, Register counter_addr, Register Rbumped_count, bool decrement = false);

  void increment_mdp_data_at(Register counter_addr, Register Rbumped_count, bool decrement = false);
  void increment_mdp_data_at(Register reg, int constant, Register scratch, Register Rbumped_count, bool decrement = false);

  void set_mdp_flag_at(int flag_constant, Register scratch);
  void test_mdp_data_at(int offset, Register value, Label& not_equal_continue, Register test_out);

  void update_mdp_by_offset(int offset_of_disp, Register scratch);
  void update_mdp_by_offset(Register reg, int offset_of_disp,
                            Register scratch);
  void update_mdp_by_constant(int constant);
  void update_mdp_for_ret(TosState state, Register return_bci);

  void profile_taken_branch(Register scratch, Register bumped_count);
  void profile_not_taken_branch(Register scratch1, Register scratch2);
  void profile_call(Register scratch1, Register scratch2);
  void profile_final_call(Register scratch1, Register scratch2);
  void profile_virtual_call(Register Rreceiver, Register Rscratch1, Register Rscratch2,  bool receiver_can_be_null);
  void profile_typecheck(Register Rklass, Register Rscratch1, Register Rscratch2);
  void profile_ret(TosState state, Register return_bci, Register scratch1, Register scratch2);
  void profile_switch_default(Register scratch1, Register scratch2);
  void profile_switch_case(Register index, Register scratch1,Register scratch2, Register scratch3);
  void profile_null_seen(Register Rscratch1, Register Rscratch2);
  void record_klass_in_profile(Register receiver, Register scratch1, Register scratch2);
  void record_klass_in_profile_helper(Register receiver, Register scratch1, Register scratch2, int start_row, Label& done);

  // Argument and return type profiling.
  void profile_obj_type(Register obj, Register mdo_addr_base, RegisterOrConstant mdo_addr_offs, Register tmp, Register tmp2);
  void profile_arguments_type(Register callee, Register tmp1, Register tmp2, bool is_virtual);
  void profile_return_type(Register ret, Register tmp1, Register tmp2);
  void profile_parameters_type(Register tmp1, Register tmp2, Register tmp3, Register tmp4);

  // Debugging
  void verify_oop(Register reg, TosState state = atos);    // only if +VerifyOops && state == atos
  void verify_oop_or_return_address(Register reg, Register rtmp); // for astore

  typedef enum { NotifyJVMTI, SkipNotifyJVMTI } NotifyMethodExitMode;

  // Support for jvmdi/jvmpi.
  void notify_method_entry();
  void notify_method_exit(bool is_native_method, TosState state,
                          NotifyMethodExitMode mode, bool check_exceptions);
};

#endif // CPU_PPC_INTERP_MASM_PPC_HPP