1 // Copyright 2011 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are
6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided
11 // with the distribution.
12 // * Neither the name of Google Inc. nor the names of its
13 // contributors may be used to endorse or promote products derived
14 // from this software without specific prior written permission.
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 #include "code-stubs.h"
33 #include "deoptimizer.h"
35 #include "disassembler.h"
36 #include "macro-assembler.h"
37 #include "serialize.h"
38 #include "string-stream.h"
43 #ifdef ENABLE_DISASSEMBLER
45 void Disassembler::Dump(FILE* f, byte* begin, byte* end) {
46 for (byte* pc = begin; pc < end; pc++) {
48 PrintF("%" V8PRIxPTR " %4" V8PRIdPTR " %02x\n",
49 reinterpret_cast<intptr_t>(pc),
53 fprintf(f, "%" V8PRIxPTR " %4" V8PRIdPTR " %02x\n",
54 reinterpret_cast<uintptr_t>(pc), pc - begin, *pc);
60 class V8NameConverter: public disasm::NameConverter {
62 explicit V8NameConverter(Code* code) : code_(code) {}
63 virtual const char* NameOfAddress(byte* pc) const;
64 virtual const char* NameInCode(byte* addr) const;
65 Code* code() const { return code_; }
69 EmbeddedVector<char, 128> v8_buffer_;
73 const char* V8NameConverter::NameOfAddress(byte* pc) const {
74 const char* name = Isolate::Current()->builtins()->Lookup(pc);
76 OS::SNPrintF(v8_buffer_, "%s (%p)", name, pc);
77 return v8_buffer_.start();
81 int offs = static_cast<int>(pc - code_->instruction_start());
82 // print as code offset, if it seems reasonable
83 if (0 <= offs && offs < code_->instruction_size()) {
84 OS::SNPrintF(v8_buffer_, "%d (%p)", offs, pc);
85 return v8_buffer_.start();
89 return disasm::NameConverter::NameOfAddress(pc);
93 const char* V8NameConverter::NameInCode(byte* addr) const {
94 // The V8NameConverter is used for well known code, so we can "safely"
95 // dereference pointers in generated code.
96 return (code_ != NULL) ? reinterpret_cast<const char*>(addr) : "";
100 static void DumpBuffer(FILE* f, StringBuilder* out) {
102 PrintF("%s\n", out->Finalize());
104 fprintf(f, "%s\n", out->Finalize());
111 static const int kOutBufferSize = 2048 + String::kMaxShortPrintLength;
112 static const int kRelocInfoPosition = 57;
114 static int DecodeIt(FILE* f,
115 const V8NameConverter& converter,
118 NoHandleAllocation ha;
119 AssertNoAllocation no_alloc;
120 ExternalReferenceEncoder ref_encoder;
123 v8::internal::EmbeddedVector<char, 128> decode_buffer;
124 v8::internal::EmbeddedVector<char, kOutBufferSize> out_buffer;
125 StringBuilder out(out_buffer.start(), out_buffer.length());
127 disasm::Disassembler d(converter);
128 RelocIterator* it = NULL;
129 if (converter.code() != NULL) {
130 it = new RelocIterator(converter.code());
132 // No relocation information when printing code stubs.
134 int constants = -1; // no constants being decoded at the start
137 // First decode instruction so that we know its length.
140 OS::SNPrintF(decode_buffer,
142 *reinterpret_cast<int32_t*>(pc));
146 int num_const = d.ConstantPoolSizeAt(pc);
147 if (num_const >= 0) {
148 OS::SNPrintF(decode_buffer,
149 "%08x constant pool begin",
150 *reinterpret_cast<int32_t*>(pc));
151 constants = num_const;
153 } else if (it != NULL && !it->done() && it->rinfo()->pc() == pc &&
154 it->rinfo()->rmode() == RelocInfo::INTERNAL_REFERENCE) {
155 // raw pointer embedded in code stream, e.g., jump table
156 byte* ptr = *reinterpret_cast<byte**>(pc);
157 OS::SNPrintF(decode_buffer,
158 "%08" V8PRIxPTR " jump table entry %4" V8PRIdPTR,
163 decode_buffer[0] = '\0';
164 pc += d.InstructionDecode(decode_buffer, pc);
168 // Collect RelocInfo for this instruction (prev_pc .. pc-1)
169 List<const char*> comments(4);
171 List<RelocInfo::Mode> rmodes(1);
172 List<intptr_t> datas(1);
174 while (!it->done() && it->rinfo()->pc() < pc) {
175 if (RelocInfo::IsComment(it->rinfo()->rmode())) {
176 // For comments just collect the text.
177 comments.Add(reinterpret_cast<const char*>(it->rinfo()->data()));
179 // For other reloc info collect all data.
180 pcs.Add(it->rinfo()->pc());
181 rmodes.Add(it->rinfo()->rmode());
182 datas.Add(it->rinfo()->data());
189 for (int i = 0; i < comments.length(); i++) {
190 out.AddFormatted(" %s", comments[i]);
194 // Instruction address and instruction offset.
195 out.AddFormatted("%p %4d ", prev_pc, prev_pc - begin);
198 out.AddFormatted("%s", decode_buffer.start());
200 // Print all the reloc info for this instruction which are not comments.
201 for (int i = 0; i < pcs.length(); i++) {
202 // Put together the reloc info
203 RelocInfo relocinfo(pcs[i], rmodes[i], datas[i], NULL);
205 // Indent the printing of the reloc info.
207 // The first reloc info is printed after the disassembled instruction.
208 out.AddPadding(' ', kRelocInfoPosition - out.position());
210 // Additional reloc infos are printed on separate lines.
212 out.AddPadding(' ', kRelocInfoPosition);
215 RelocInfo::Mode rmode = relocinfo.rmode();
216 if (RelocInfo::IsPosition(rmode)) {
217 if (RelocInfo::IsStatementPosition(rmode)) {
218 out.AddFormatted(" ;; debug: statement %d", relocinfo.data());
220 out.AddFormatted(" ;; debug: position %d", relocinfo.data());
222 } else if (rmode == RelocInfo::EMBEDDED_OBJECT) {
223 HeapStringAllocator allocator;
224 StringStream accumulator(&allocator);
225 relocinfo.target_object()->ShortPrint(&accumulator);
226 SmartArrayPointer<const char> obj_name = accumulator.ToCString();
227 out.AddFormatted(" ;; object: %s", *obj_name);
228 } else if (rmode == RelocInfo::EXTERNAL_REFERENCE) {
229 const char* reference_name =
230 ref_encoder.NameOfAddress(*relocinfo.target_reference_address());
231 out.AddFormatted(" ;; external reference (%s)", reference_name);
232 } else if (RelocInfo::IsCodeTarget(rmode)) {
233 out.AddFormatted(" ;; code:");
234 if (rmode == RelocInfo::CONSTRUCT_CALL) {
235 out.AddFormatted(" constructor,");
237 Code* code = Code::GetCodeFromTargetAddress(relocinfo.target_address());
238 Code::Kind kind = code->kind();
239 if (code->is_inline_cache_stub()) {
240 if (rmode == RelocInfo::CODE_TARGET_CONTEXT) {
241 out.AddFormatted(" contextual,");
243 InlineCacheState ic_state = code->ic_state();
244 out.AddFormatted(" %s, %s", Code::Kind2String(kind),
245 Code::ICState2String(ic_state));
246 if (ic_state == MONOMORPHIC) {
247 PropertyType type = code->type();
248 out.AddFormatted(", %s", Code::PropertyType2String(type));
250 if (kind == Code::CALL_IC || kind == Code::KEYED_CALL_IC) {
251 out.AddFormatted(", argc = %d", code->arguments_count());
253 } else if (kind == Code::STUB) {
254 // Reverse lookup required as the minor key cannot be retrieved
255 // from the code object.
256 Object* obj = heap->code_stubs()->SlowReverseLookup(code);
257 if (obj != heap->undefined_value()) {
258 ASSERT(obj->IsSmi());
259 // Get the STUB key and extract major and minor key.
260 uint32_t key = Smi::cast(obj)->value();
261 uint32_t minor_key = CodeStub::MinorKeyFromKey(key);
262 CodeStub::Major major_key = CodeStub::GetMajorKey(code);
263 ASSERT(major_key == CodeStub::MajorKeyFromKey(key));
264 out.AddFormatted(" %s, %s, ",
265 Code::Kind2String(kind),
266 CodeStub::MajorName(major_key, false));
268 case CodeStub::CallFunction: {
270 CallFunctionStub::ExtractArgcFromMinorKey(minor_key);
271 out.AddFormatted("argc = %d", argc);
275 out.AddFormatted("minor: %d", minor_key);
279 out.AddFormatted(" %s", Code::Kind2String(kind));
281 if (rmode == RelocInfo::CODE_TARGET_WITH_ID) {
282 out.AddFormatted(" (id = %d)", static_cast<int>(relocinfo.data()));
284 } else if (rmode == RelocInfo::RUNTIME_ENTRY &&
285 Isolate::Current()->deoptimizer_data() != NULL) {
286 // A runtime entry reloinfo might be a deoptimization bailout.
287 Address addr = relocinfo.target_address();
288 int id = Deoptimizer::GetDeoptimizationId(addr, Deoptimizer::EAGER);
289 if (id == Deoptimizer::kNotDeoptimizationEntry) {
290 out.AddFormatted(" ;; %s", RelocInfo::RelocModeName(rmode));
292 out.AddFormatted(" ;; deoptimization bailout %d", id);
295 out.AddFormatted(" ;; %s", RelocInfo::RelocModeName(rmode));
301 // Emit comments following the last instruction (if any).
303 for ( ; !it->done(); it->next()) {
304 if (RelocInfo::IsComment(it->rinfo()->rmode())) {
305 out.AddFormatted(" %s",
306 reinterpret_cast<const char*>(it->rinfo()->data()));
313 return static_cast<int>(pc - begin);
317 int Disassembler::Decode(FILE* f, byte* begin, byte* end) {
318 V8NameConverter defaultConverter(NULL);
319 return DecodeIt(f, defaultConverter, begin, end);
323 // Called by Code::CodePrint.
324 void Disassembler::Decode(FILE* f, Code* code) {
325 int decode_size = (code->kind() == Code::OPTIMIZED_FUNCTION)
326 ? static_cast<int>(code->safepoint_table_offset())
327 : code->instruction_size();
328 // If there might be a stack check table, stop before reaching it.
329 if (code->kind() == Code::FUNCTION) {
331 Min(decode_size, static_cast<int>(code->stack_check_table_offset()));
334 byte* begin = code->instruction_start();
335 byte* end = begin + decode_size;
336 V8NameConverter v8NameConverter(code);
337 DecodeIt(f, v8NameConverter, begin, end);
340 #else // ENABLE_DISASSEMBLER
342 void Disassembler::Dump(FILE* f, byte* begin, byte* end) {}
343 int Disassembler::Decode(FILE* f, byte* begin, byte* end) { return 0; }
344 void Disassembler::Decode(FILE* f, Code* code) {}
346 #endif // ENABLE_DISASSEMBLER
348 } } // namespace v8::internal