| // Copyright 2011 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * 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. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "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 THE COPYRIGHT |
| // OWNER 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 "v8.h" |
| |
| #include "code-stubs.h" |
| #include "codegen.h" |
| #include "debug.h" |
| #include "deoptimizer.h" |
| #include "disasm.h" |
| #include "disassembler.h" |
| #include "macro-assembler.h" |
| #include "serialize.h" |
| #include "string-stream.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| #ifdef ENABLE_DISASSEMBLER |
| |
| void Disassembler::Dump(FILE* f, byte* begin, byte* end) { |
| for (byte* pc = begin; pc < end; pc++) { |
| if (f == NULL) { |
| PrintF("%" V8PRIxPTR " %4" V8PRIdPTR " %02x\n", |
| reinterpret_cast<intptr_t>(pc), |
| pc - begin, |
| *pc); |
| } else { |
| PrintF(f, "%" V8PRIxPTR " %4" V8PRIdPTR " %02x\n", |
| reinterpret_cast<uintptr_t>(pc), pc - begin, *pc); |
| } |
| } |
| } |
| |
| |
| class V8NameConverter: public disasm::NameConverter { |
| public: |
| explicit V8NameConverter(Code* code) : code_(code) {} |
| virtual const char* NameOfAddress(byte* pc) const; |
| virtual const char* NameInCode(byte* addr) const; |
| Code* code() const { return code_; } |
| private: |
| Code* code_; |
| |
| EmbeddedVector<char, 128> v8_buffer_; |
| }; |
| |
| |
| const char* V8NameConverter::NameOfAddress(byte* pc) const { |
| const char* name = code_->GetIsolate()->builtins()->Lookup(pc); |
| if (name != NULL) { |
| OS::SNPrintF(v8_buffer_, "%s (%p)", name, pc); |
| return v8_buffer_.start(); |
| } |
| |
| if (code_ != NULL) { |
| int offs = static_cast<int>(pc - code_->instruction_start()); |
| // print as code offset, if it seems reasonable |
| if (0 <= offs && offs < code_->instruction_size()) { |
| OS::SNPrintF(v8_buffer_, "%d (%p)", offs, pc); |
| return v8_buffer_.start(); |
| } |
| } |
| |
| return disasm::NameConverter::NameOfAddress(pc); |
| } |
| |
| |
| const char* V8NameConverter::NameInCode(byte* addr) const { |
| // The V8NameConverter is used for well known code, so we can "safely" |
| // dereference pointers in generated code. |
| return (code_ != NULL) ? reinterpret_cast<const char*>(addr) : ""; |
| } |
| |
| |
| static void DumpBuffer(FILE* f, StringBuilder* out) { |
| if (f == NULL) { |
| PrintF("%s\n", out->Finalize()); |
| } else { |
| PrintF(f, "%s\n", out->Finalize()); |
| } |
| out->Reset(); |
| } |
| |
| |
| static const int kOutBufferSize = 2048 + String::kMaxShortPrintLength; |
| static const int kRelocInfoPosition = 57; |
| |
| static int DecodeIt(Isolate* isolate, |
| FILE* f, |
| const V8NameConverter& converter, |
| byte* begin, |
| byte* end) { |
| SealHandleScope shs(isolate); |
| DisallowHeapAllocation no_alloc; |
| ExternalReferenceEncoder ref_encoder(isolate); |
| Heap* heap = isolate->heap(); |
| |
| v8::internal::EmbeddedVector<char, 128> decode_buffer; |
| v8::internal::EmbeddedVector<char, kOutBufferSize> out_buffer; |
| StringBuilder out(out_buffer.start(), out_buffer.length()); |
| byte* pc = begin; |
| disasm::Disassembler d(converter); |
| RelocIterator* it = NULL; |
| if (converter.code() != NULL) { |
| it = new RelocIterator(converter.code()); |
| } else { |
| // No relocation information when printing code stubs. |
| } |
| int constants = -1; // no constants being decoded at the start |
| |
| while (pc < end) { |
| // First decode instruction so that we know its length. |
| byte* prev_pc = pc; |
| if (constants > 0) { |
| OS::SNPrintF(decode_buffer, |
| "%08x constant", |
| *reinterpret_cast<int32_t*>(pc)); |
| constants--; |
| pc += 4; |
| } else { |
| int num_const = d.ConstantPoolSizeAt(pc); |
| if (num_const >= 0) { |
| OS::SNPrintF(decode_buffer, |
| "%08x constant pool begin", |
| *reinterpret_cast<int32_t*>(pc)); |
| constants = num_const; |
| pc += 4; |
| } else if (it != NULL && !it->done() && it->rinfo()->pc() == pc && |
| it->rinfo()->rmode() == RelocInfo::INTERNAL_REFERENCE) { |
| // raw pointer embedded in code stream, e.g., jump table |
| byte* ptr = *reinterpret_cast<byte**>(pc); |
| OS::SNPrintF(decode_buffer, |
| "%08" V8PRIxPTR " jump table entry %4" V8PRIdPTR, |
| ptr, |
| ptr - begin); |
| pc += 4; |
| } else { |
| decode_buffer[0] = '\0'; |
| pc += d.InstructionDecode(decode_buffer, pc); |
| } |
| } |
| |
| // Collect RelocInfo for this instruction (prev_pc .. pc-1) |
| List<const char*> comments(4); |
| List<byte*> pcs(1); |
| List<RelocInfo::Mode> rmodes(1); |
| List<intptr_t> datas(1); |
| if (it != NULL) { |
| while (!it->done() && it->rinfo()->pc() < pc) { |
| if (RelocInfo::IsComment(it->rinfo()->rmode())) { |
| // For comments just collect the text. |
| comments.Add(reinterpret_cast<const char*>(it->rinfo()->data())); |
| } else { |
| // For other reloc info collect all data. |
| pcs.Add(it->rinfo()->pc()); |
| rmodes.Add(it->rinfo()->rmode()); |
| datas.Add(it->rinfo()->data()); |
| } |
| it->next(); |
| } |
| } |
| |
| // Comments. |
| for (int i = 0; i < comments.length(); i++) { |
| out.AddFormatted(" %s", comments[i]); |
| DumpBuffer(f, &out); |
| } |
| |
| // Instruction address and instruction offset. |
| out.AddFormatted("%p %4d ", prev_pc, prev_pc - begin); |
| |
| // Instruction. |
| out.AddFormatted("%s", decode_buffer.start()); |
| |
| // Print all the reloc info for this instruction which are not comments. |
| for (int i = 0; i < pcs.length(); i++) { |
| // Put together the reloc info |
| RelocInfo relocinfo(pcs[i], rmodes[i], datas[i], converter.code()); |
| |
| // Indent the printing of the reloc info. |
| if (i == 0) { |
| // The first reloc info is printed after the disassembled instruction. |
| out.AddPadding(' ', kRelocInfoPosition - out.position()); |
| } else { |
| // Additional reloc infos are printed on separate lines. |
| DumpBuffer(f, &out); |
| out.AddPadding(' ', kRelocInfoPosition); |
| } |
| |
| RelocInfo::Mode rmode = relocinfo.rmode(); |
| if (RelocInfo::IsPosition(rmode)) { |
| if (RelocInfo::IsStatementPosition(rmode)) { |
| out.AddFormatted(" ;; debug: statement %d", relocinfo.data()); |
| } else { |
| out.AddFormatted(" ;; debug: position %d", relocinfo.data()); |
| } |
| } else if (rmode == RelocInfo::EMBEDDED_OBJECT) { |
| HeapStringAllocator allocator; |
| StringStream accumulator(&allocator); |
| relocinfo.target_object()->ShortPrint(&accumulator); |
| SmartArrayPointer<const char> obj_name = accumulator.ToCString(); |
| out.AddFormatted(" ;; object: %s", obj_name.get()); |
| } else if (rmode == RelocInfo::EXTERNAL_REFERENCE) { |
| const char* reference_name = |
| ref_encoder.NameOfAddress(relocinfo.target_reference()); |
| out.AddFormatted(" ;; external reference (%s)", reference_name); |
| } else if (RelocInfo::IsCodeTarget(rmode)) { |
| out.AddFormatted(" ;; code:"); |
| if (rmode == RelocInfo::CONSTRUCT_CALL) { |
| out.AddFormatted(" constructor,"); |
| } |
| Code* code = Code::GetCodeFromTargetAddress(relocinfo.target_address()); |
| Code::Kind kind = code->kind(); |
| if (code->is_inline_cache_stub()) { |
| if (kind == Code::LOAD_IC && |
| LoadIC::GetContextualMode(code->extra_ic_state()) == CONTEXTUAL) { |
| out.AddFormatted(" contextual,"); |
| } |
| InlineCacheState ic_state = code->ic_state(); |
| out.AddFormatted(" %s, %s", Code::Kind2String(kind), |
| Code::ICState2String(ic_state)); |
| if (ic_state == MONOMORPHIC) { |
| Code::StubType type = code->type(); |
| out.AddFormatted(", %s", Code::StubType2String(type)); |
| } |
| } else if (kind == Code::STUB || kind == Code::HANDLER) { |
| // Reverse lookup required as the minor key cannot be retrieved |
| // from the code object. |
| Object* obj = heap->code_stubs()->SlowReverseLookup(code); |
| if (obj != heap->undefined_value()) { |
| ASSERT(obj->IsSmi()); |
| // Get the STUB key and extract major and minor key. |
| uint32_t key = Smi::cast(obj)->value(); |
| uint32_t minor_key = CodeStub::MinorKeyFromKey(key); |
| CodeStub::Major major_key = CodeStub::GetMajorKey(code); |
| ASSERT(major_key == CodeStub::MajorKeyFromKey(key)); |
| out.AddFormatted(" %s, %s, ", |
| Code::Kind2String(kind), |
| CodeStub::MajorName(major_key, false)); |
| switch (major_key) { |
| case CodeStub::CallFunction: { |
| int argc = |
| CallFunctionStub::ExtractArgcFromMinorKey(minor_key); |
| out.AddFormatted("argc = %d", argc); |
| break; |
| } |
| default: |
| out.AddFormatted("minor: %d", minor_key); |
| } |
| } |
| } else { |
| out.AddFormatted(" %s", Code::Kind2String(kind)); |
| } |
| if (rmode == RelocInfo::CODE_TARGET_WITH_ID) { |
| out.AddFormatted(" (id = %d)", static_cast<int>(relocinfo.data())); |
| } |
| } else if (RelocInfo::IsRuntimeEntry(rmode) && |
| isolate->deoptimizer_data() != NULL) { |
| // A runtime entry reloinfo might be a deoptimization bailout. |
| Address addr = relocinfo.target_address(); |
| int id = Deoptimizer::GetDeoptimizationId(isolate, |
| addr, |
| Deoptimizer::EAGER); |
| if (id == Deoptimizer::kNotDeoptimizationEntry) { |
| id = Deoptimizer::GetDeoptimizationId(isolate, |
| addr, |
| Deoptimizer::LAZY); |
| if (id == Deoptimizer::kNotDeoptimizationEntry) { |
| id = Deoptimizer::GetDeoptimizationId(isolate, |
| addr, |
| Deoptimizer::SOFT); |
| if (id == Deoptimizer::kNotDeoptimizationEntry) { |
| out.AddFormatted(" ;; %s", RelocInfo::RelocModeName(rmode)); |
| } else { |
| out.AddFormatted(" ;; soft deoptimization bailout %d", id); |
| } |
| } else { |
| out.AddFormatted(" ;; lazy deoptimization bailout %d", id); |
| } |
| } else { |
| out.AddFormatted(" ;; deoptimization bailout %d", id); |
| } |
| } else { |
| out.AddFormatted(" ;; %s", RelocInfo::RelocModeName(rmode)); |
| } |
| } |
| DumpBuffer(f, &out); |
| } |
| |
| // Emit comments following the last instruction (if any). |
| if (it != NULL) { |
| for ( ; !it->done(); it->next()) { |
| if (RelocInfo::IsComment(it->rinfo()->rmode())) { |
| out.AddFormatted(" %s", |
| reinterpret_cast<const char*>(it->rinfo()->data())); |
| DumpBuffer(f, &out); |
| } |
| } |
| } |
| |
| delete it; |
| return static_cast<int>(pc - begin); |
| } |
| |
| |
| int Disassembler::Decode(Isolate* isolate, FILE* f, byte* begin, byte* end) { |
| V8NameConverter defaultConverter(NULL); |
| return DecodeIt(isolate, f, defaultConverter, begin, end); |
| } |
| |
| |
| // Called by Code::CodePrint. |
| void Disassembler::Decode(FILE* f, Code* code) { |
| Isolate* isolate = code->GetIsolate(); |
| int decode_size = code->is_crankshafted() |
| ? static_cast<int>(code->safepoint_table_offset()) |
| : code->instruction_size(); |
| // If there might be a back edge table, stop before reaching it. |
| if (code->kind() == Code::FUNCTION) { |
| decode_size = |
| Min(decode_size, static_cast<int>(code->back_edge_table_offset())); |
| } |
| |
| byte* begin = code->instruction_start(); |
| byte* end = begin + decode_size; |
| V8NameConverter v8NameConverter(code); |
| DecodeIt(isolate, f, v8NameConverter, begin, end); |
| } |
| |
| #else // ENABLE_DISASSEMBLER |
| |
| void Disassembler::Dump(FILE* f, byte* begin, byte* end) {} |
| int Disassembler::Decode(Isolate* isolate, FILE* f, byte* begin, byte* end) { |
| return 0; |
| } |
| |
| |
| void Disassembler::Decode(FILE* f, Code* code) {} |
| |
| #endif // ENABLE_DISASSEMBLER |
| |
| } } // namespace v8::internal |
