jit/JITDisassembler.cpp

   1 /*
   2  * Copyright (C) 2012 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "JITDisassembler.h"
  28
  29 #if ENABLE(JIT)
  30
  31 #include "CodeBlock.h"
  32 #include "CodeBlockWithJITType.h"
  33 #include "JIT.h"
  34 #include <wtf/StringPrintStream.h>
  35
  36 namespace JSC {
  37
  38 JITDisassembler::JITDisassembler(CodeBlock *codeBlock)
  39     : m_codeBlock(codeBlock)
  40     , m_labelForBytecodeIndexInMainPath(codeBlock->instructionCount())
  41     , m_labelForBytecodeIndexInSlowPath(codeBlock->instructionCount())
  42 {
  43 }
  44
  45 JITDisassembler::~JITDisassembler()
  46 {
  47 }
  48
  49 void JITDisassembler::dump(PrintStream& out, LinkBuffer& linkBuffer)
  50 {
  51     dumpHeader(out, linkBuffer);
  52     dumpDisassembly(out, linkBuffer, m_startOfCode, m_labelForBytecodeIndexInMainPath[0]);
  53
  54     dumpForInstructions(out, linkBuffer, "    ", m_labelForBytecodeIndexInMainPath, firstSlowLabel());
  55     out.print("    (End Of Main Path)\n");
  56     dumpForInstructions(out, linkBuffer, "    (S) ", m_labelForBytecodeIndexInSlowPath, m_endOfSlowPath);
  57     out.print("    (End Of Slow Path)\n");
  58
  59     dumpDisassembly(out, linkBuffer, m_endOfSlowPath, m_endOfCode);
  60 }
  61
  62 void JITDisassembler::dump(LinkBuffer& linkBuffer)
  63 {
  64     dump(WTF::dataFile(), linkBuffer);
  65 }
  66
  67 void JITDisassembler::reportToProfiler(Profiler::Compilation* compilation, LinkBuffer& linkBuffer)
  68 {
  69     StringPrintStream out;
  70
  71     dumpHeader(out, linkBuffer);
  72     compilation->addDescription(Profiler::CompiledBytecode(Profiler::OriginStack(), out.toCString()));
  73     out.reset();
  74     dumpDisassembly(out, linkBuffer, m_startOfCode, m_labelForBytecodeIndexInMainPath[0]);
  75     compilation->addDescription(Profiler::CompiledBytecode(Profiler::OriginStack(), out.toCString()));
  76
  77     reportInstructions(compilation, linkBuffer, "    ", m_labelForBytecodeIndexInMainPath, firstSlowLabel());
  78     compilation->addDescription(Profiler::CompiledBytecode(Profiler::OriginStack(), "    (End Of Main Path)\n"));
  79     reportInstructions(compilation, linkBuffer, "    (S) ", m_labelForBytecodeIndexInSlowPath, m_endOfSlowPath);
  80     compilation->addDescription(Profiler::CompiledBytecode(Profiler::OriginStack(), "    (End Of Slow Path)\n"));
  81     out.reset();
  82     dumpDisassembly(out, linkBuffer, m_endOfSlowPath, m_endOfCode);
  83     compilation->addDescription(Profiler::CompiledBytecode(Profiler::OriginStack(), out.toCString()));
  84 }
  85
  86 void JITDisassembler::dumpHeader(PrintStream& out, LinkBuffer& linkBuffer)
  87 {
  88     out.print("Generated Baseline JIT code for ", CodeBlockWithJITType(m_codeBlock, JITCode::BaselineJIT), ", instruction count = ", m_codeBlock->instructionCount(), "\n");
  89     out.print("   Source: ", m_codeBlock->sourceCodeOnOneLine(), "\n");
  90     out.print("   Code at [", RawPointer(linkBuffer.debugAddress()), ", ", RawPointer(static_cast<char*>(linkBuffer.debugAddress()) + linkBuffer.debugSize()), "):\n");
  91 }
  92
  93 MacroAssembler::Label JITDisassembler::firstSlowLabel()
  94 {
  95     MacroAssembler::Label firstSlowLabel;
  96     for (unsigned i = 0; i < m_labelForBytecodeIndexInSlowPath.size(); ++i) {
  97         if (m_labelForBytecodeIndexInSlowPath[i].isSet()) {
  98             firstSlowLabel = m_labelForBytecodeIndexInSlowPath[i];
  99             break;
 100         }
 101     }
 102     return firstSlowLabel.isSet() ? firstSlowLabel : m_endOfSlowPath;
 103 }
 104
 105 Vector<JITDisassembler::DumpedOp> JITDisassembler::dumpVectorForInstructions(LinkBuffer& linkBuffer, const char* prefix, Vector<MacroAssembler::Label>& labels, MacroAssembler::Label endLabel)
 106 {
 107     StringPrintStream out;
 108     Vector<DumpedOp> result;
 109
 110     for (unsigned i = 0; i < labels.size();) {
 111         if (!labels[i].isSet()) {
 112             i++;
 113             continue;
 114         }
 115         out.reset();
 116         result.append(DumpedOp());
 117         result.last().index = i;
 118         out.print(prefix);
 119         m_codeBlock->dumpBytecode(out, i);
 120         for (unsigned nextIndex = i + 1; ; nextIndex++) {
 121             if (nextIndex >= labels.size()) {
 122                 dumpDisassembly(out, linkBuffer, labels[i], endLabel);
 123                 result.last().disassembly = out.toCString();
 124                 return result;
 125             }
 126             if (labels[nextIndex].isSet()) {
 127                 dumpDisassembly(out, linkBuffer, labels[i], labels[nextIndex]);
 128                 result.last().disassembly = out.toCString();
 129                 i = nextIndex;
 130                 break;
 131             }
 132         }
 133     }
 134
 135     return result;
 136 }
 137
 138 void JITDisassembler::dumpForInstructions(PrintStream& out, LinkBuffer& linkBuffer, const char* prefix, Vector<MacroAssembler::Label>& labels, MacroAssembler::Label endLabel)
 139 {
 140     Vector<DumpedOp> dumpedOps = dumpVectorForInstructions(linkBuffer, prefix, labels, endLabel);
 141
 142     for (unsigned i = 0; i < dumpedOps.size(); ++i)
 143         out.print(dumpedOps[i].disassembly);
 144 }
 145
 146 void JITDisassembler::reportInstructions(Profiler::Compilation* compilation, LinkBuffer& linkBuffer, const char* prefix, Vector<MacroAssembler::Label>& labels, MacroAssembler::Label endLabel)
 147 {
 148     Vector<DumpedOp> dumpedOps = dumpVectorForInstructions(linkBuffer, prefix, labels, endLabel);
 149
 150     for (unsigned i = 0; i < dumpedOps.size(); ++i) {
 151         compilation->addDescription(
 152             Profiler::CompiledBytecode(
 153                 Profiler::OriginStack(Profiler::Origin(compilation->bytecodes(), dumpedOps[i].index)),
 154                 dumpedOps[i].disassembly));
 155     }
 156 }
 157
 158 void JITDisassembler::dumpDisassembly(PrintStream& out, LinkBuffer& linkBuffer, MacroAssembler::Label from, MacroAssembler::Label to)
 159 {
 160     CodeLocationLabel fromLocation = linkBuffer.locationOf(from);
 161     CodeLocationLabel toLocation = linkBuffer.locationOf(to);
 162     disassemble(fromLocation, bitwise_cast<uintptr_t>(toLocation.executableAddress()) - bitwise_cast<uintptr_t>(fromLocation.executableAddress()), "        ", out);
 163 }
 164
 165 } // namespace JSC
 166
 167 #endif // ENABLE(JIT)
 168