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+// 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-inl.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 {
+ fprintf(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 = Isolate::Current()->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, char* buff) {
+ if (f == NULL) {
+ PrintF("%s", buff);
+ } else {
+ fprintf(f, "%s", buff);
+ }
+}
+
+static const int kOutBufferSize = 2048 + String::kMaxShortPrintLength;
+static const int kRelocInfoPosition = 57;
+
+static int DecodeIt(FILE* f,
+ const V8NameConverter& converter,
+ byte* begin,
+ byte* end) {
+ NoHandleAllocation ha;
+ AssertNoAllocation no_alloc;
+ ExternalReferenceEncoder ref_encoder;
+ Heap* heap = HEAP;
+
+ v8::internal::EmbeddedVector<char, 128> decode_buffer;
+ v8::internal::EmbeddedVector<char, kOutBufferSize> out_buffer;
+ 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();
+ }
+ }
+
+ StringBuilder out(out_buffer.start(), out_buffer.length());
+
+ // Comments.
+ for (int i = 0; i < comments.length(); i++) {
+ out.AddFormatted(" %s\n", comments[i]);
+ }
+
+ // Write out comments, resets outp so that we can format the next line.
+ DumpBuffer(f, out.Finalize());
+ out.Reset();
+
+ // 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]);
+
+ // 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.
+ out.AddFormatted("\n");
+ 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);
+ SmartPointer<const char> obj_name = accumulator.ToCString();
+ out.AddFormatted(" ;; object: %s", *obj_name);
+ } else if (rmode == RelocInfo::EXTERNAL_REFERENCE) {
+ const char* reference_name =
+ ref_encoder.NameOfAddress(*relocinfo.target_reference_address());
+ 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 (rmode == RelocInfo::CODE_TARGET_CONTEXT) {
+ out.AddFormatted(" contextual,");
+ }
+ InlineCacheState ic_state = code->ic_state();
+ out.AddFormatted(" %s, %s", Code::Kind2String(kind),
+ Code::ICState2String(ic_state));
+ if (ic_state == MONOMORPHIC) {
+ PropertyType type = code->type();
+ out.AddFormatted(", %s", Code::PropertyType2String(type));
+ }
+ if (code->ic_in_loop() == IN_LOOP) {
+ out.AddFormatted(", in_loop");
+ }
+ if (kind == Code::CALL_IC || kind == Code::KEYED_CALL_IC) {
+ out.AddFormatted(", argc = %d", code->arguments_count());
+ }
+ } else if (kind == Code::STUB) {
+ // 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));
+ }
+ } else if (rmode == RelocInfo::RUNTIME_ENTRY) {
+ // A runtime entry reloinfo might be a deoptimization bailout.
+ Address addr = relocinfo.target_address();
+ int id = Deoptimizer::GetDeoptimizationId(addr, Deoptimizer::EAGER);
+ if (id == Deoptimizer::kNotDeoptimizationEntry) {
+ out.AddFormatted(" ;; %s", RelocInfo::RelocModeName(rmode));
+ } else {
+ out.AddFormatted(" ;; deoptimization bailout %d", id);
+ }
+ } else {
+ out.AddFormatted(" ;; %s", RelocInfo::RelocModeName(rmode));
+ }
+ }
+ out.AddString("\n");
+ DumpBuffer(f, out.Finalize());
+ out.Reset();
+ }
+
+ delete it;
+ return static_cast<int>(pc - begin);
+}
+
+
+int Disassembler::Decode(FILE* f, byte* begin, byte* end) {
+ V8NameConverter defaultConverter(NULL);
+ return DecodeIt(f, defaultConverter, begin, end);
+}
+
+
+// Called by Code::CodePrint.
+void Disassembler::Decode(FILE* f, Code* code) {
+ int decode_size = (code->kind() == Code::OPTIMIZED_FUNCTION)
+ ? static_cast<int>(code->safepoint_table_offset())
+ : code->instruction_size();
+ // If there might be a stack check table, stop before reaching it.
+ if (code->kind() == Code::FUNCTION) {
+ decode_size =
+ Min(decode_size, static_cast<int>(code->stack_check_table_offset()));
+ }
+
+ byte* begin = code->instruction_start();
+ byte* end = begin + decode_size;
+ V8NameConverter v8NameConverter(code);
+ DecodeIt(f, v8NameConverter, begin, end);
+}
+
+#else // ENABLE_DISASSEMBLER
+
+void Disassembler::Dump(FILE* f, byte* begin, byte* end) {}
+int Disassembler::Decode(FILE* f, byte* begin, byte* end) { return 0; }
+void Disassembler::Decode(FILE* f, Code* code) {}
+
+#endif // ENABLE_DISASSEMBLER
+
+} } // namespace v8::internal
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