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| |
| #include "qv4functiontable_p.h" |
| #include "qv4function_p.h" |
| |
| #include <assembler/MacroAssemblerCodeRef.h> |
| |
| #include <QtCore/qfile.h> |
| #include <QtCore/qcoreapplication.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| namespace QV4 { |
| |
| void generateFunctionTable(Function *function, JSC::MacroAssemblerCodeRef *codeRef) |
| { |
| // This implements writing of JIT'd addresses so that perf can find the |
| // symbol names. |
| // |
| // Perf expects the mapping to be in a certain place and have certain |
| // content, for more information, see: |
| // https://github.com/torvalds/linux/blob/master/tools/perf/Documentation/jit-interface.txt |
| static bool doProfile = !qEnvironmentVariableIsEmpty("QV4_PROFILE_WRITE_PERF_MAP"); |
| if (Q_UNLIKELY(doProfile)) { |
| static QFile perfMapFile(QString::fromLatin1("/tmp/perf-%1.map") |
| .arg(QCoreApplication::applicationPid())); |
| static const bool isOpen = perfMapFile.open(QIODevice::WriteOnly); |
| if (!isOpen) { |
| qWarning("QV4::JIT::Assembler: Cannot write perf map file."); |
| doProfile = false; |
| } else { |
| const void *address = codeRef->code().executableAddress(); |
| perfMapFile.write(QByteArray::number(reinterpret_cast<quintptr>(address), 16)); |
| perfMapFile.putChar(' '); |
| perfMapFile.write(QByteArray::number(static_cast<qsizetype>(codeRef->size()), 16)); |
| perfMapFile.putChar(' '); |
| perfMapFile.write(Function::prettyName(function, address).toUtf8()); |
| perfMapFile.putChar('\n'); |
| perfMapFile.flush(); |
| } |
| } |
| } |
| |
| void destroyFunctionTable(Function *function, JSC::MacroAssemblerCodeRef *codeRef) |
| { |
| Q_UNUSED(function); |
| Q_UNUSED(codeRef); |
| |
| // It's not advisable to remove things from the perf map file, as it's primarily used to analyze |
| // a trace after the application has terminated. We want to know about all functions that were |
| // ever jitted then. If the memory ranges overlap, we will have a problem when analyzing the |
| // trace. The JIT should try to avoid this. |
| } |
| |
| size_t exceptionHandlerSize() |
| { |
| return 0; |
| } |
| |
| } // QV4 |
| |
| QT_END_NAMESPACE |