WebKit/Source/JavaScriptCore/jit/JITDisassembler.cpp at main · WebKit/WebKit · GitHub

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* Redistribution and use in source and binary forms, with or without

* modification, are permitted provided that the following conditions

* are met:

* 1. Redistributions of source code must retain the above copyright

* notice, this list of conditions and the following disclaimer.

* 2. Redistributions in binary form must reproduce the above copyright

* notice, this list of conditions and the following disclaimer in the

* documentation and/or other materials provided with the distribution.

* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY

* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR

* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include "config.h"

#include "JITDisassembler.h"

#if ENABLE(JIT)

#include "CodeBlock.h"

#include "CodeBlockWithJITType.h"

#include "Disassembler.h"

#include "JSCellInlines.h"

#include "LinkBuffer.h"

#include "ProfilerCompilation.h"

#include <wtf/StringPrintStream.h>

#include <wtf/TZoneMallocInlines.h>

WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN

namespace JSC {

WTF_MAKE_TZONE_ALLOCATED_IMPL(JITDisassembler);

JITDisassembler::JITDisassembler(CodeBlock *codeBlock)

: m_codeBlock(codeBlock)

, m_labelForBytecodeIndexInMainPath(codeBlock->instructions().size())

, m_labelForBytecodeIndexInSlowPath(codeBlock->instructions().size())

{

}

JITDisassembler::~JITDisassembler() = default;

void JITDisassembler::setLinkedStartAndEnd(const LinkBuffer& linkBuffer)

{

m_codeStart = linkBuffer.entrypoint<DisassemblyPtrTag>().untaggedPtr();

m_codeEnd = std::bit_cast<uint8_t*>(m_codeStart) + linkBuffer.size();

}

void JITDisassembler::dump(PrintStream& out, LinkBuffer& linkBuffer)

{

setLinkedStartAndEnd(linkBuffer);

dumpHeader(out, linkBuffer);

dumpDisassembly(out, linkBuffer, m_startOfCode, m_labelForBytecodeIndexInMainPath[0].first);

dumpForInstructions(out, linkBuffer, " ", m_labelForBytecodeIndexInMainPath, firstSlowLabel());

out.print(" (End Of Main Path)\n");

dumpForInstructions(out, linkBuffer, " (S) ", m_labelForBytecodeIndexInSlowPath, m_endOfSlowPath);

out.print(" (End Of Slow Path)\n");

dumpDisassembly(out, linkBuffer, m_endOfSlowPath, m_endOfCode);

}

void JITDisassembler::dump(LinkBuffer& linkBuffer)

{

dump(WTF::dataFile(), linkBuffer);

}

void JITDisassembler::reportToProfiler(Profiler::Compilation* compilation, LinkBuffer& linkBuffer)

{

setLinkedStartAndEnd(linkBuffer);

StringPrintStream out;

dumpHeader(out, linkBuffer);

compilation->addDescription(Profiler::CompiledBytecode(Profiler::OriginStack(), out.toCString()));

out.reset();

dumpDisassembly(out, linkBuffer, m_startOfCode, m_labelForBytecodeIndexInMainPath[0].first);

compilation->addDescription(Profiler::CompiledBytecode(Profiler::OriginStack(), out.toCString()));

reportInstructions(compilation, linkBuffer, " ", m_labelForBytecodeIndexInMainPath, firstSlowLabel());

compilation->addDescription(Profiler::CompiledBytecode(Profiler::OriginStack(), " (End Of Main Path)\n"_s));

reportInstructions(compilation, linkBuffer, " (S) ", m_labelForBytecodeIndexInSlowPath, m_endOfSlowPath);

compilation->addDescription(Profiler::CompiledBytecode(Profiler::OriginStack(), " (End Of Slow Path)\n"_s));

out.reset();

dumpDisassembly(out, linkBuffer, m_endOfSlowPath, m_endOfCode);

compilation->addDescription(Profiler::CompiledBytecode(Profiler::OriginStack(), out.toCString()));

}

void JITDisassembler::dumpHeader(PrintStream& out, LinkBuffer& linkBuffer)

{

out.print("Generated Baseline JIT code for ", CodeBlockWithJITType(m_codeBlock, JITType::BaselineJIT), ", instructions size = ", m_codeBlock->instructionsSize(), "\n");

out.print(" Source: ", m_codeBlock->sourceCodeOnOneLine(), "\n");

out.print(" Code at [", RawPointer(linkBuffer.debugAddress()), ", ", RawPointer(static_cast<char*>(linkBuffer.debugAddress()) + linkBuffer.size()), "):\n");

}

MacroAssembler::Label JITDisassembler::firstSlowLabel()

{

MacroAssembler::Label firstSlowLabel;

for (unsigned i = 0; i < m_labelForBytecodeIndexInSlowPath.size(); ++i) {

if (m_labelForBytecodeIndexInSlowPath[i].first.isSet()) {

firstSlowLabel = m_labelForBytecodeIndexInSlowPath[i].first;

break;

}

return firstSlowLabel.isSet() ? firstSlowLabel : m_endOfSlowPath;

}

Vector<JITDisassembler::DumpedOp> JITDisassembler::dumpVectorForInstructions(LinkBuffer& linkBuffer, const char* prefix, Vector<std::pair<MacroAssembler::Label, CString>>& labels, MacroAssembler::Label endLabel)

{

StringPrintStream out;

Vector<DumpedOp> result;

for (unsigned i = 0; i < labels.size();) {

if (!labels[i].first.isSet()) {

i++;

continue;

}

out.reset();

result.append(DumpedOp());

result.last().bytecodeIndex = BytecodeIndex(i);

out.print(prefix);

m_codeBlock->dumpBytecode(out, i);

if (!labels[i].second.isNull())

out.println(" ", labels[i].second);

for (unsigned nextIndex = i + 1; ; nextIndex++) {

if (nextIndex >= labels.size()) {

dumpDisassembly(out, linkBuffer, labels[i].first, endLabel);

result.last().disassembly = out.toCString();

return result;

}

if (labels[nextIndex].first.isSet()) {

dumpDisassembly(out, linkBuffer, labels[i].first, labels[nextIndex].first);

result.last().disassembly = out.toCString();

i = nextIndex;

break;

}

return result;

}

void JITDisassembler::dumpForInstructions(PrintStream& out, LinkBuffer& linkBuffer, const char* prefix, Vector<std::pair<MacroAssembler::Label, CString>>& labels, MacroAssembler::Label endLabel)

{

Vector<DumpedOp> dumpedOps = dumpVectorForInstructions(linkBuffer, prefix, labels, endLabel);

for (unsigned i = 0; i < dumpedOps.size(); ++i)

out.print(dumpedOps[i].disassembly);

}

void JITDisassembler::reportInstructions(Profiler::Compilation* compilation, LinkBuffer& linkBuffer, const char* prefix, Vector<std::pair<MacroAssembler::Label, CString>>& labels, MacroAssembler::Label endLabel)

{

Vector<DumpedOp> dumpedOps = dumpVectorForInstructions(linkBuffer, prefix, labels, endLabel);

for (unsigned i = 0; i < dumpedOps.size(); ++i) {

compilation->addDescription(

Profiler::CompiledBytecode(

Profiler::OriginStack(Profiler::Origin(compilation->bytecodes(), dumpedOps[i].bytecodeIndex)),

dumpedOps[i].disassembly));

}

void JITDisassembler::dumpDisassembly(PrintStream& out, LinkBuffer& linkBuffer, MacroAssembler::Label from, MacroAssembler::Label to)

{

CodeLocationLabel<DisassemblyPtrTag> fromLocation = linkBuffer.locationOf<DisassemblyPtrTag>(from);

CodeLocationLabel<DisassemblyPtrTag> toLocation = linkBuffer.locationOf<DisassemblyPtrTag>(to);

disassemble(fromLocation, toLocation.dataLocation<uintptr_t>() - fromLocation.dataLocation<uintptr_t>(), m_codeStart, m_codeEnd, " ", out);

}

} // namespace JSC

WTF_ALLOW_UNSAFE_BUFFER_USAGE_END

#endif // ENABLE(JIT)

WebKit/Source/JavaScriptCore/jit/JITDisassembler.cpp at main · WebKit/WebKit · GitHub

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