C++ DumpContext::dump方法代码示例

void link(State& state)
{
    Graph& graph = state.graph;
    CodeBlock* codeBlock = graph.m_codeBlock;
    VM& vm = graph.m_vm;

    // LLVM will create its own jump tables as needed.
    codeBlock->clearSwitchJumpTables();

#if !FTL_USES_B3
    // What LLVM's stackmaps call stackSizeForLocals and what we call frameRegisterCount have a simple
    // relationship, though it's not obvious from reading the code. The easiest way to understand them
    // is to look at stackOffset, i.e. what you have to add to FP to get SP. For LLVM that is just:
    //
    //     stackOffset == -state.jitCode->stackmaps.stackSizeForLocals()
    //
    // The way we define frameRegisterCount is that it satisfies this equality:
    //
    //     stackOffset == virtualRegisterForLocal(frameRegisterCount - 1).offset() * sizeof(Register)
    //
    // We can simplify this when we apply virtualRegisterForLocal():
    //
    //     stackOffset == (-1 - (frameRegisterCount - 1)) * sizeof(Register)
    //     stackOffset == (-1 - frameRegisterCount + 1) * sizeof(Register)
    //     stackOffset == -frameRegisterCount * sizeof(Register)
    //
    // Therefore we just have:
    //
    //     frameRegisterCount == -stackOffset / sizeof(Register)
    //
    // If we substitute what we have above, we get:
    //
    //     frameRegisterCount == -(-state.jitCode->stackmaps.stackSizeForLocals()) / sizeof(Register)
    //     frameRegisterCount == state.jitCode->stackmaps.stackSizeForLocals() / sizeof(Register)
    state.jitCode->common.frameRegisterCount = state.jitCode->stackmaps.stackSizeForLocals() / sizeof(void*);
#endif

    state.jitCode->common.requiredRegisterCountForExit = graph.requiredRegisterCountForExit();

    if (!graph.m_plan.inlineCallFrames->isEmpty())
        state.jitCode->common.inlineCallFrames = graph.m_plan.inlineCallFrames;

    graph.registerFrozenValues();

    // Create the entrypoint. Note that we use this entrypoint totally differently
    // depending on whether we're doing OSR entry or not.
    CCallHelpers jit(&vm, codeBlock);

    std::unique_ptr<LinkBuffer> linkBuffer;

    CCallHelpers::Address frame = CCallHelpers::Address(
                                      CCallHelpers::stackPointerRegister, -static_cast<int32_t>(AssemblyHelpers::prologueStackPointerDelta()));

    if (Profiler::Compilation* compilation = graph.compilation()) {
        compilation->addDescription(
            Profiler::OriginStack(),
            toCString("Generated FTL JIT code for ", CodeBlockWithJITType(codeBlock, JITCode::FTLJIT), ", instruction count = ", graph.m_codeBlock->instructionCount(), ":\n"));

        graph.ensureDominators();
        graph.ensureNaturalLoops();

        const char* prefix = "    ";

        DumpContext dumpContext;
        StringPrintStream out;
        Node* lastNode = 0;
        for (size_t blockIndex = 0; blockIndex < graph.numBlocks(); ++blockIndex) {
            BasicBlock* block = graph.block(blockIndex);
            if (!block)
                continue;

            graph.dumpBlockHeader(out, prefix, block, Graph::DumpLivePhisOnly, &dumpContext);
            compilation->addDescription(Profiler::OriginStack(), out.toCString());
            out.reset();

            for (size_t nodeIndex = 0; nodeIndex < block->size(); ++nodeIndex) {
                Node* node = block->at(nodeIndex);

                Profiler::OriginStack stack;

                if (node->origin.semantic.isSet()) {
                    stack = Profiler::OriginStack(
                                *vm.m_perBytecodeProfiler, codeBlock, node->origin.semantic);
                }

                if (graph.dumpCodeOrigin(out, prefix, lastNode, node, &dumpContext)) {
                    compilation->addDescription(stack, out.toCString());
                    out.reset();
                }

                graph.dump(out, prefix, node, &dumpContext);
                compilation->addDescription(stack, out.toCString());
                out.reset();

                if (node->origin.semantic.isSet())
                    lastNode = node;
            }
        }

        dumpContext.dump(out, prefix);
//.........这里部分代码省略.........

void link(State& state)
{
    Graph& graph = state.graph;
    CodeBlock* codeBlock = graph.m_codeBlock;
    VM& vm = graph.m_vm;
    
    // LLVM will create its own jump tables as needed.
    codeBlock->clearSwitchJumpTables();
    
    // FIXME: Need to know the real frame register count.
    // https://bugs.webkit.org/show_bug.cgi?id=125727
    state.jitCode->common.frameRegisterCount = 1000;
    
    state.jitCode->common.requiredRegisterCountForExit = graph.requiredRegisterCountForExit();
    
    if (!graph.m_plan.inlineCallFrames->isEmpty())
        state.jitCode->common.inlineCallFrames = graph.m_plan.inlineCallFrames;
    
    graph.registerFrozenValues();

    // Create the entrypoint. Note that we use this entrypoint totally differently
    // depending on whether we're doing OSR entry or not.
    CCallHelpers jit(&vm, codeBlock);
    
    std::unique_ptr<LinkBuffer> linkBuffer;

    CCallHelpers::Address frame = CCallHelpers::Address(
        CCallHelpers::stackPointerRegister, -static_cast<int32_t>(AssemblyHelpers::prologueStackPointerDelta()));
    
    if (Profiler::Compilation* compilation = graph.compilation()) {
        compilation->addDescription(
            Profiler::OriginStack(),
            toCString("Generated FTL JIT code for ", CodeBlockWithJITType(codeBlock, JITCode::FTLJIT), ", instruction count = ", graph.m_codeBlock->instructionCount(), ":\n"));
        
        graph.m_dominators.computeIfNecessary(graph);
        graph.m_naturalLoops.computeIfNecessary(graph);
        
        const char* prefix = "    ";
        
        DumpContext dumpContext;
        StringPrintStream out;
        Node* lastNode = 0;
        for (size_t blockIndex = 0; blockIndex < graph.numBlocks(); ++blockIndex) {
            BasicBlock* block = graph.block(blockIndex);
            if (!block)
                continue;
            
            graph.dumpBlockHeader(out, prefix, block, Graph::DumpLivePhisOnly, &dumpContext);
            compilation->addDescription(Profiler::OriginStack(), out.toCString());
            out.reset();
            
            for (size_t nodeIndex = 0; nodeIndex < block->size(); ++nodeIndex) {
                Node* node = block->at(nodeIndex);
                if (!node->willHaveCodeGenOrOSR() && !Options::showAllDFGNodes())
                    continue;
                
                Profiler::OriginStack stack;
                
                if (node->origin.semantic.isSet()) {
                    stack = Profiler::OriginStack(
                        *vm.m_perBytecodeProfiler, codeBlock, node->origin.semantic);
                }
                
                if (graph.dumpCodeOrigin(out, prefix, lastNode, node, &dumpContext)) {
                    compilation->addDescription(stack, out.toCString());
                    out.reset();
                }
                
                graph.dump(out, prefix, node, &dumpContext);
                compilation->addDescription(stack, out.toCString());
                out.reset();
                
                if (node->origin.semantic.isSet())
                    lastNode = node;
            }
        }
        
        dumpContext.dump(out, prefix);
        compilation->addDescription(Profiler::OriginStack(), out.toCString());
        out.reset();
        
        out.print("    Disassembly:\n");
        for (unsigned i = 0; i < state.jitCode->handles().size(); ++i) {
            if (state.codeSectionNames[i] != SECTION_NAME("text"))
                continue;
            
                ExecutableMemoryHandle* handle = state.jitCode->handles()[i].get();
                disassemble(
                    MacroAssemblerCodePtr(handle->start()), handle->sizeInBytes(),
                    "      ", out, LLVMSubset);
        }
        compilation->addDescription(Profiler::OriginStack(), out.toCString());
        out.reset();
        
        state.jitCode->common.compilation = compilation;
    }
    
    switch (graph.m_plan.mode) {
    case FTLMode: {
        CCallHelpers::JumpList mainPathJumps;
//.........这里部分代码省略.........