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1 // Copyright 2013 the V8 project authors. All rights reserved. | 1 // Copyright 2013 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "src/sampler.h" | 5 #include "src/sampler.h" |
6 | 6 |
7 #if V8_OS_POSIX && !V8_OS_CYGWIN | 7 #if V8_OS_POSIX && !V8_OS_CYGWIN |
8 | 8 |
9 #define USE_SIGNALS | 9 #define USE_SIGNALS |
10 | 10 |
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166 PlatformDataCommon() : profiled_thread_id_(ThreadId::Current()) {} | 166 PlatformDataCommon() : profiled_thread_id_(ThreadId::Current()) {} |
167 ThreadId profiled_thread_id() { return profiled_thread_id_; } | 167 ThreadId profiled_thread_id() { return profiled_thread_id_; } |
168 | 168 |
169 protected: | 169 protected: |
170 ~PlatformDataCommon() {} | 170 ~PlatformDataCommon() {} |
171 | 171 |
172 private: | 172 private: |
173 ThreadId profiled_thread_id_; | 173 ThreadId profiled_thread_id_; |
174 }; | 174 }; |
175 | 175 |
176 | |
177 // Check if the code at specified address could potentially be a | |
178 // frame setup code. | |
179 bool IsNoFrameRegion(Address address) { | |
180 struct Pattern { | |
181 int bytes_count; | |
182 byte bytes[8]; | |
183 int offsets[4]; | |
184 }; | |
185 byte* pc = reinterpret_cast<byte*>(address); | |
186 static Pattern patterns[] = { | |
187 #if V8_HOST_ARCH_IA32 | |
188 // push %ebp | |
189 // mov %esp,%ebp | |
190 {3, {0x55, 0x89, 0xe5}, {0, 1, -1}}, | |
191 // pop %ebp | |
192 // ret N | |
193 {2, {0x5d, 0xc2}, {0, 1, -1}}, | |
194 // pop %ebp | |
195 // ret | |
196 {2, {0x5d, 0xc3}, {0, 1, -1}}, | |
197 #elif V8_HOST_ARCH_X64 | |
198 // pushq %rbp | |
199 // movq %rsp,%rbp | |
200 {4, {0x55, 0x48, 0x89, 0xe5}, {0, 1, -1}}, | |
201 // popq %rbp | |
202 // ret N | |
203 {2, {0x5d, 0xc2}, {0, 1, -1}}, | |
204 // popq %rbp | |
205 // ret | |
206 {2, {0x5d, 0xc3}, {0, 1, -1}}, | |
207 #endif | |
208 {0, {}, {}} | |
209 }; | |
210 for (Pattern* pattern = patterns; pattern->bytes_count; ++pattern) { | |
211 for (int* offset = pattern->offsets; *offset != -1; ++offset) { | |
212 if (!memcmp(pc - *offset, pattern->bytes, pattern->bytes_count)) | |
yurys
2015/09/16 14:42:01
what about the potential case that we discussed of
alph
2015/09/16 17:28:50
It should never happen for JS code, because of Cod
| |
213 return true; | |
214 } | |
215 } | |
216 return false; | |
217 } | |
218 | |
176 } // namespace | 219 } // namespace |
177 | 220 |
178 #if defined(USE_SIGNALS) | 221 #if defined(USE_SIGNALS) |
179 | 222 |
180 class Sampler::PlatformData : public PlatformDataCommon { | 223 class Sampler::PlatformData : public PlatformDataCommon { |
181 public: | 224 public: |
182 PlatformData() : vm_tid_(pthread_self()) {} | 225 PlatformData() : vm_tid_(pthread_self()) {} |
183 pthread_t vm_tid() const { return vm_tid_; } | 226 pthread_t vm_tid() const { return vm_tid_; } |
184 | 227 |
185 private: | 228 private: |
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585 timestamp = base::TimeTicks::HighResolutionNow(); | 628 timestamp = base::TimeTicks::HighResolutionNow(); |
586 pc = reinterpret_cast<Address>(regs.pc); | 629 pc = reinterpret_cast<Address>(regs.pc); |
587 state = isolate->current_vm_state(); | 630 state = isolate->current_vm_state(); |
588 | 631 |
589 // Avoid collecting traces while doing GC. | 632 // Avoid collecting traces while doing GC. |
590 if (state == GC) return; | 633 if (state == GC) return; |
591 | 634 |
592 Address js_entry_sp = isolate->js_entry_sp(); | 635 Address js_entry_sp = isolate->js_entry_sp(); |
593 if (js_entry_sp == 0) return; // Not executing JS now. | 636 if (js_entry_sp == 0) return; // Not executing JS now. |
594 | 637 |
638 if (pc && IsNoFrameRegion(pc)) { | |
639 pc = 0; | |
640 return; | |
641 } | |
642 | |
595 ExternalCallbackScope* scope = isolate->external_callback_scope(); | 643 ExternalCallbackScope* scope = isolate->external_callback_scope(); |
596 Address handler = Isolate::handler(isolate->thread_local_top()); | 644 Address handler = Isolate::handler(isolate->thread_local_top()); |
597 // If there is a handler on top of the external callback scope then | 645 // If there is a handler on top of the external callback scope then |
598 // we have already entrered JavaScript again and the external callback | 646 // we have already entrered JavaScript again and the external callback |
599 // is not the top function. | 647 // is not the top function. |
600 if (scope && scope->scope_address() < handler) { | 648 if (scope && scope->scope_address() < handler) { |
601 external_callback = scope->callback(); | 649 external_callback = scope->callback(); |
602 has_external_callback = true; | 650 has_external_callback = true; |
603 } else { | 651 } else { |
604 // Sample potential return address value for frameless invocation of | 652 // Sample potential return address value for frameless invocation of |
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768 SampleStack(state); | 816 SampleStack(state); |
769 } | 817 } |
770 ResumeThread(profiled_thread); | 818 ResumeThread(profiled_thread); |
771 } | 819 } |
772 | 820 |
773 #endif // USE_SIGNALS | 821 #endif // USE_SIGNALS |
774 | 822 |
775 | 823 |
776 } // namespace internal | 824 } // namespace internal |
777 } // namespace v8 | 825 } // namespace v8 |
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