619570b3dd
LOG=N R=bmeurer@chromium.org BUG=chromium:506443 Review URL: https://codereview.chromium.org/1217673003 Cr-Commit-Position: refs/heads/master@{#29463}
300 lines
11 KiB
C++
300 lines
11 KiB
C++
// Copyright 2011 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "src/v8.h"
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#include "src/code-stubs.h"
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#include "src/codegen.h"
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#include "src/debug.h"
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#include "src/deoptimizer.h"
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#include "src/disasm.h"
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#include "src/disassembler.h"
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#include "src/macro-assembler.h"
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#include "src/snapshot/serialize.h"
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#include "src/string-stream.h"
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namespace v8 {
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namespace internal {
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#ifdef ENABLE_DISASSEMBLER
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class V8NameConverter: public disasm::NameConverter {
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public:
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explicit V8NameConverter(Code* code) : code_(code) {}
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virtual const char* NameOfAddress(byte* pc) const;
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virtual const char* NameInCode(byte* addr) const;
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Code* code() const { return code_; }
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private:
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Code* code_;
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EmbeddedVector<char, 128> v8_buffer_;
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};
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const char* V8NameConverter::NameOfAddress(byte* pc) const {
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const char* name = code_->GetIsolate()->builtins()->Lookup(pc);
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if (name != NULL) {
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SNPrintF(v8_buffer_, "%s (%p)", name, pc);
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return v8_buffer_.start();
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}
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if (code_ != NULL) {
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int offs = static_cast<int>(pc - code_->instruction_start());
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// print as code offset, if it seems reasonable
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if (0 <= offs && offs < code_->instruction_size()) {
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SNPrintF(v8_buffer_, "%d (%p)", offs, pc);
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return v8_buffer_.start();
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}
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}
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return disasm::NameConverter::NameOfAddress(pc);
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}
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const char* V8NameConverter::NameInCode(byte* addr) const {
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// The V8NameConverter is used for well known code, so we can "safely"
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// dereference pointers in generated code.
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return (code_ != NULL) ? reinterpret_cast<const char*>(addr) : "";
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}
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static void DumpBuffer(std::ostream* os, StringBuilder* out) {
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(*os) << out->Finalize() << std::endl;
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out->Reset();
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}
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static const int kOutBufferSize = 2048 + String::kMaxShortPrintLength;
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static const int kRelocInfoPosition = 57;
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static int DecodeIt(Isolate* isolate, std::ostream* os,
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const V8NameConverter& converter, byte* begin, byte* end) {
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SealHandleScope shs(isolate);
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DisallowHeapAllocation no_alloc;
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ExternalReferenceEncoder ref_encoder(isolate);
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v8::internal::EmbeddedVector<char, 128> decode_buffer;
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v8::internal::EmbeddedVector<char, kOutBufferSize> out_buffer;
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StringBuilder out(out_buffer.start(), out_buffer.length());
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byte* pc = begin;
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disasm::Disassembler d(converter);
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RelocIterator* it = NULL;
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if (converter.code() != NULL) {
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it = new RelocIterator(converter.code());
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} else {
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// No relocation information when printing code stubs.
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}
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int constants = -1; // no constants being decoded at the start
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while (pc < end) {
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// First decode instruction so that we know its length.
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byte* prev_pc = pc;
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if (constants > 0) {
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SNPrintF(decode_buffer,
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"%08x constant",
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*reinterpret_cast<int32_t*>(pc));
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constants--;
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pc += 4;
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} else {
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int num_const = d.ConstantPoolSizeAt(pc);
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if (num_const >= 0) {
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SNPrintF(decode_buffer,
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"%08x constant pool begin (num_const = %d)",
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*reinterpret_cast<int32_t*>(pc), num_const);
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constants = num_const;
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pc += 4;
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} else if (it != NULL && !it->done() && it->rinfo()->pc() == pc &&
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it->rinfo()->rmode() == RelocInfo::INTERNAL_REFERENCE) {
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// raw pointer embedded in code stream, e.g., jump table
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byte* ptr = *reinterpret_cast<byte**>(pc);
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SNPrintF(decode_buffer,
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"%08" V8PRIxPTR " jump table entry %4" V8PRIdPTR,
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reinterpret_cast<intptr_t>(ptr),
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ptr - begin);
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pc += sizeof(ptr);
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} else {
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decode_buffer[0] = '\0';
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pc += d.InstructionDecode(decode_buffer, pc);
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}
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}
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// Collect RelocInfo for this instruction (prev_pc .. pc-1)
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List<const char*> comments(4);
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List<byte*> pcs(1);
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List<RelocInfo::Mode> rmodes(1);
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List<intptr_t> datas(1);
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if (it != NULL) {
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while (!it->done() && it->rinfo()->pc() < pc) {
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if (RelocInfo::IsComment(it->rinfo()->rmode())) {
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// For comments just collect the text.
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comments.Add(reinterpret_cast<const char*>(it->rinfo()->data()));
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} else {
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// For other reloc info collect all data.
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pcs.Add(it->rinfo()->pc());
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rmodes.Add(it->rinfo()->rmode());
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datas.Add(it->rinfo()->data());
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}
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it->next();
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}
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}
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// Comments.
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for (int i = 0; i < comments.length(); i++) {
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out.AddFormatted(" %s", comments[i]);
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DumpBuffer(os, &out);
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}
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// Instruction address and instruction offset.
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out.AddFormatted("%p %4d ", prev_pc, prev_pc - begin);
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// Instruction.
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out.AddFormatted("%s", decode_buffer.start());
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// Print all the reloc info for this instruction which are not comments.
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for (int i = 0; i < pcs.length(); i++) {
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// Put together the reloc info
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RelocInfo relocinfo(pcs[i], rmodes[i], datas[i], converter.code());
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// Indent the printing of the reloc info.
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if (i == 0) {
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// The first reloc info is printed after the disassembled instruction.
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out.AddPadding(' ', kRelocInfoPosition - out.position());
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} else {
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// Additional reloc infos are printed on separate lines.
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DumpBuffer(os, &out);
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out.AddPadding(' ', kRelocInfoPosition);
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}
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RelocInfo::Mode rmode = relocinfo.rmode();
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if (RelocInfo::IsPosition(rmode)) {
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if (RelocInfo::IsStatementPosition(rmode)) {
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out.AddFormatted(" ;; debug: statement %d", relocinfo.data());
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} else {
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out.AddFormatted(" ;; debug: position %d", relocinfo.data());
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}
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} else if (rmode == RelocInfo::DEOPT_REASON) {
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Deoptimizer::DeoptReason reason =
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static_cast<Deoptimizer::DeoptReason>(relocinfo.data());
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out.AddFormatted(" ;; debug: deopt reason '%s'",
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Deoptimizer::GetDeoptReason(reason));
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} else if (rmode == RelocInfo::EMBEDDED_OBJECT) {
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HeapStringAllocator allocator;
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StringStream accumulator(&allocator);
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relocinfo.target_object()->ShortPrint(&accumulator);
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SmartArrayPointer<const char> obj_name = accumulator.ToCString();
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out.AddFormatted(" ;; object: %s", obj_name.get());
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} else if (rmode == RelocInfo::EXTERNAL_REFERENCE) {
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const char* reference_name = ref_encoder.NameOfAddress(
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isolate, relocinfo.target_external_reference());
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out.AddFormatted(" ;; external reference (%s)", reference_name);
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} else if (RelocInfo::IsCodeTarget(rmode)) {
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out.AddFormatted(" ;; code:");
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if (rmode == RelocInfo::CONSTRUCT_CALL) {
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out.AddFormatted(" constructor,");
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}
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Code* code = Code::GetCodeFromTargetAddress(relocinfo.target_address());
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Code::Kind kind = code->kind();
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if (code->is_inline_cache_stub()) {
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if (kind == Code::LOAD_IC &&
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LoadICState::GetContextualMode(code->extra_ic_state()) ==
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CONTEXTUAL) {
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out.AddFormatted(" contextual,");
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}
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InlineCacheState ic_state = code->ic_state();
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out.AddFormatted(" %s, %s", Code::Kind2String(kind),
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Code::ICState2String(ic_state));
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if (ic_state == MONOMORPHIC) {
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Code::StubType type = code->type();
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out.AddFormatted(", %s", Code::StubType2String(type));
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}
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} else if (kind == Code::STUB || kind == Code::HANDLER) {
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// Get the STUB key and extract major and minor key.
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uint32_t key = code->stub_key();
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uint32_t minor_key = CodeStub::MinorKeyFromKey(key);
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CodeStub::Major major_key = CodeStub::GetMajorKey(code);
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DCHECK(major_key == CodeStub::MajorKeyFromKey(key));
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out.AddFormatted(" %s, %s, ", Code::Kind2String(kind),
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CodeStub::MajorName(major_key, false));
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switch (major_key) {
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case CodeStub::CallFunction: {
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int argc = CallFunctionStub::ExtractArgcFromMinorKey(minor_key);
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out.AddFormatted("argc = %d", argc);
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break;
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}
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default:
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out.AddFormatted("minor: %d", minor_key);
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}
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} else {
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out.AddFormatted(" %s", Code::Kind2String(kind));
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}
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if (rmode == RelocInfo::CODE_TARGET_WITH_ID) {
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out.AddFormatted(" (id = %d)", static_cast<int>(relocinfo.data()));
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}
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} else if (RelocInfo::IsRuntimeEntry(rmode) &&
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isolate->deoptimizer_data() != NULL) {
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// A runtime entry reloinfo might be a deoptimization bailout.
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Address addr = relocinfo.target_address();
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int id = Deoptimizer::GetDeoptimizationId(isolate,
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addr,
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Deoptimizer::EAGER);
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if (id == Deoptimizer::kNotDeoptimizationEntry) {
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id = Deoptimizer::GetDeoptimizationId(isolate,
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addr,
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Deoptimizer::LAZY);
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if (id == Deoptimizer::kNotDeoptimizationEntry) {
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id = Deoptimizer::GetDeoptimizationId(isolate,
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addr,
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Deoptimizer::SOFT);
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if (id == Deoptimizer::kNotDeoptimizationEntry) {
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out.AddFormatted(" ;; %s", RelocInfo::RelocModeName(rmode));
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} else {
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out.AddFormatted(" ;; soft deoptimization bailout %d", id);
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}
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} else {
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out.AddFormatted(" ;; lazy deoptimization bailout %d", id);
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}
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} else {
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out.AddFormatted(" ;; deoptimization bailout %d", id);
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}
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} else {
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out.AddFormatted(" ;; %s", RelocInfo::RelocModeName(rmode));
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}
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}
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DumpBuffer(os, &out);
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}
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// Emit comments following the last instruction (if any).
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if (it != NULL) {
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for ( ; !it->done(); it->next()) {
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if (RelocInfo::IsComment(it->rinfo()->rmode())) {
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out.AddFormatted(" %s",
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reinterpret_cast<const char*>(it->rinfo()->data()));
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DumpBuffer(os, &out);
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}
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}
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}
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delete it;
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return static_cast<int>(pc - begin);
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}
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int Disassembler::Decode(Isolate* isolate, std::ostream* os, byte* begin,
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byte* end, Code* code) {
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V8NameConverter v8NameConverter(code);
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return DecodeIt(isolate, os, v8NameConverter, begin, end);
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}
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#else // ENABLE_DISASSEMBLER
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int Disassembler::Decode(Isolate* isolate, std::ostream* os, byte* begin,
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byte* end, Code* code) {
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return 0;
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}
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#endif // ENABLE_DISASSEMBLER
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} // namespace internal
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} // namespace v8
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