| // Copyright 2012 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 "profile-generator-inl.h" |
| |
| #include "compiler.h" |
| #include "debug.h" |
| #include "sampler.h" |
| #include "global-handles.h" |
| #include "scopeinfo.h" |
| #include "unicode.h" |
| #include "zone-inl.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| StringsStorage::StringsStorage(Heap* heap) |
| : hash_seed_(heap->HashSeed()), names_(StringsMatch) { |
| } |
| |
| |
| StringsStorage::~StringsStorage() { |
| for (HashMap::Entry* p = names_.Start(); |
| p != NULL; |
| p = names_.Next(p)) { |
| DeleteArray(reinterpret_cast<const char*>(p->value)); |
| } |
| } |
| |
| |
| const char* StringsStorage::GetCopy(const char* src) { |
| int len = static_cast<int>(strlen(src)); |
| Vector<char> dst = Vector<char>::New(len + 1); |
| OS::StrNCpy(dst, src, len); |
| dst[len] = '\0'; |
| uint32_t hash = |
| StringHasher::HashSequentialString(dst.start(), len, hash_seed_); |
| return AddOrDisposeString(dst.start(), hash); |
| } |
| |
| |
| const char* StringsStorage::GetFormatted(const char* format, ...) { |
| va_list args; |
| va_start(args, format); |
| const char* result = GetVFormatted(format, args); |
| va_end(args); |
| return result; |
| } |
| |
| |
| const char* StringsStorage::AddOrDisposeString(char* str, uint32_t hash) { |
| HashMap::Entry* cache_entry = names_.Lookup(str, hash, true); |
| if (cache_entry->value == NULL) { |
| // New entry added. |
| cache_entry->value = str; |
| } else { |
| DeleteArray(str); |
| } |
| return reinterpret_cast<const char*>(cache_entry->value); |
| } |
| |
| |
| const char* StringsStorage::GetVFormatted(const char* format, va_list args) { |
| Vector<char> str = Vector<char>::New(1024); |
| int len = OS::VSNPrintF(str, format, args); |
| if (len == -1) { |
| DeleteArray(str.start()); |
| return format; |
| } |
| uint32_t hash = StringHasher::HashSequentialString( |
| str.start(), len, hash_seed_); |
| return AddOrDisposeString(str.start(), hash); |
| } |
| |
| |
| const char* StringsStorage::GetName(Name* name) { |
| if (name->IsString()) { |
| String* str = String::cast(name); |
| int length = Min(kMaxNameSize, str->length()); |
| SmartArrayPointer<char> data = |
| str->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL, 0, length); |
| uint32_t hash = StringHasher::HashSequentialString( |
| *data, length, name->GetHeap()->HashSeed()); |
| return AddOrDisposeString(data.Detach(), hash); |
| } else if (name->IsSymbol()) { |
| return "<symbol>"; |
| } |
| return ""; |
| } |
| |
| |
| const char* StringsStorage::GetName(int index) { |
| return GetFormatted("%d", index); |
| } |
| |
| |
| size_t StringsStorage::GetUsedMemorySize() const { |
| size_t size = sizeof(*this); |
| size += sizeof(HashMap::Entry) * names_.capacity(); |
| for (HashMap::Entry* p = names_.Start(); p != NULL; p = names_.Next(p)) { |
| size += strlen(reinterpret_cast<const char*>(p->value)) + 1; |
| } |
| return size; |
| } |
| |
| |
| const char* const CodeEntry::kEmptyNamePrefix = ""; |
| const char* const CodeEntry::kEmptyResourceName = ""; |
| const char* const CodeEntry::kEmptyBailoutReason = ""; |
| |
| |
| CodeEntry::~CodeEntry() { |
| delete no_frame_ranges_; |
| } |
| |
| |
| void CodeEntry::CopyData(const CodeEntry& source) { |
| tag_ = source.tag_; |
| name_prefix_ = source.name_prefix_; |
| name_ = source.name_; |
| resource_name_ = source.resource_name_; |
| line_number_ = source.line_number_; |
| } |
| |
| |
| uint32_t CodeEntry::GetCallUid() const { |
| uint32_t hash = ComputeIntegerHash(tag_, v8::internal::kZeroHashSeed); |
| if (shared_id_ != 0) { |
| hash ^= ComputeIntegerHash(static_cast<uint32_t>(shared_id_), |
| v8::internal::kZeroHashSeed); |
| } else { |
| hash ^= ComputeIntegerHash( |
| static_cast<uint32_t>(reinterpret_cast<uintptr_t>(name_prefix_)), |
| v8::internal::kZeroHashSeed); |
| hash ^= ComputeIntegerHash( |
| static_cast<uint32_t>(reinterpret_cast<uintptr_t>(name_)), |
| v8::internal::kZeroHashSeed); |
| hash ^= ComputeIntegerHash( |
| static_cast<uint32_t>(reinterpret_cast<uintptr_t>(resource_name_)), |
| v8::internal::kZeroHashSeed); |
| hash ^= ComputeIntegerHash(line_number_, v8::internal::kZeroHashSeed); |
| } |
| return hash; |
| } |
| |
| |
| bool CodeEntry::IsSameAs(CodeEntry* entry) const { |
| return this == entry |
| || (tag_ == entry->tag_ |
| && shared_id_ == entry->shared_id_ |
| && (shared_id_ != 0 |
| || (name_prefix_ == entry->name_prefix_ |
| && name_ == entry->name_ |
| && resource_name_ == entry->resource_name_ |
| && line_number_ == entry->line_number_))); |
| } |
| |
| |
| void CodeEntry::SetBuiltinId(Builtins::Name id) { |
| tag_ = Logger::BUILTIN_TAG; |
| builtin_id_ = id; |
| } |
| |
| |
| ProfileNode* ProfileNode::FindChild(CodeEntry* entry) { |
| HashMap::Entry* map_entry = |
| children_.Lookup(entry, CodeEntryHash(entry), false); |
| return map_entry != NULL ? |
| reinterpret_cast<ProfileNode*>(map_entry->value) : NULL; |
| } |
| |
| |
| ProfileNode* ProfileNode::FindOrAddChild(CodeEntry* entry) { |
| HashMap::Entry* map_entry = |
| children_.Lookup(entry, CodeEntryHash(entry), true); |
| if (map_entry->value == NULL) { |
| // New node added. |
| ProfileNode* new_node = new ProfileNode(tree_, entry); |
| map_entry->value = new_node; |
| children_list_.Add(new_node); |
| } |
| return reinterpret_cast<ProfileNode*>(map_entry->value); |
| } |
| |
| |
| void ProfileNode::Print(int indent) { |
| OS::Print("%5u %*c %s%s %d #%d %s", |
| self_ticks_, |
| indent, ' ', |
| entry_->name_prefix(), |
| entry_->name(), |
| entry_->script_id(), |
| id(), |
| entry_->bailout_reason()); |
| if (entry_->resource_name()[0] != '\0') |
| OS::Print(" %s:%d", entry_->resource_name(), entry_->line_number()); |
| OS::Print("\n"); |
| for (HashMap::Entry* p = children_.Start(); |
| p != NULL; |
| p = children_.Next(p)) { |
| reinterpret_cast<ProfileNode*>(p->value)->Print(indent + 2); |
| } |
| } |
| |
| |
| class DeleteNodesCallback { |
| public: |
| void BeforeTraversingChild(ProfileNode*, ProfileNode*) { } |
| |
| void AfterAllChildrenTraversed(ProfileNode* node) { |
| delete node; |
| } |
| |
| void AfterChildTraversed(ProfileNode*, ProfileNode*) { } |
| }; |
| |
| |
| ProfileTree::ProfileTree() |
| : root_entry_(Logger::FUNCTION_TAG, "(root)"), |
| next_node_id_(1), |
| root_(new ProfileNode(this, &root_entry_)) { |
| } |
| |
| |
| ProfileTree::~ProfileTree() { |
| DeleteNodesCallback cb; |
| TraverseDepthFirst(&cb); |
| } |
| |
| |
| ProfileNode* ProfileTree::AddPathFromEnd(const Vector<CodeEntry*>& path) { |
| ProfileNode* node = root_; |
| for (CodeEntry** entry = path.start() + path.length() - 1; |
| entry != path.start() - 1; |
| --entry) { |
| if (*entry != NULL) { |
| node = node->FindOrAddChild(*entry); |
| } |
| } |
| node->IncrementSelfTicks(); |
| return node; |
| } |
| |
| |
| void ProfileTree::AddPathFromStart(const Vector<CodeEntry*>& path) { |
| ProfileNode* node = root_; |
| for (CodeEntry** entry = path.start(); |
| entry != path.start() + path.length(); |
| ++entry) { |
| if (*entry != NULL) { |
| node = node->FindOrAddChild(*entry); |
| } |
| } |
| node->IncrementSelfTicks(); |
| } |
| |
| |
| struct NodesPair { |
| NodesPair(ProfileNode* src, ProfileNode* dst) |
| : src(src), dst(dst) { } |
| ProfileNode* src; |
| ProfileNode* dst; |
| }; |
| |
| |
| class Position { |
| public: |
| explicit Position(ProfileNode* node) |
| : node(node), child_idx_(0) { } |
| INLINE(ProfileNode* current_child()) { |
| return node->children()->at(child_idx_); |
| } |
| INLINE(bool has_current_child()) { |
| return child_idx_ < node->children()->length(); |
| } |
| INLINE(void next_child()) { ++child_idx_; } |
| |
| ProfileNode* node; |
| private: |
| int child_idx_; |
| }; |
| |
| |
| // Non-recursive implementation of a depth-first post-order tree traversal. |
| template <typename Callback> |
| void ProfileTree::TraverseDepthFirst(Callback* callback) { |
| List<Position> stack(10); |
| stack.Add(Position(root_)); |
| while (stack.length() > 0) { |
| Position& current = stack.last(); |
| if (current.has_current_child()) { |
| callback->BeforeTraversingChild(current.node, current.current_child()); |
| stack.Add(Position(current.current_child())); |
| } else { |
| callback->AfterAllChildrenTraversed(current.node); |
| if (stack.length() > 1) { |
| Position& parent = stack[stack.length() - 2]; |
| callback->AfterChildTraversed(parent.node, current.node); |
| parent.next_child(); |
| } |
| // Remove child from the stack. |
| stack.RemoveLast(); |
| } |
| } |
| } |
| |
| |
| CpuProfile::CpuProfile(const char* title, unsigned uid, bool record_samples) |
| : title_(title), |
| uid_(uid), |
| record_samples_(record_samples), |
| start_time_(Time::NowFromSystemTime()) { |
| timer_.Start(); |
| } |
| |
| |
| void CpuProfile::AddPath(const Vector<CodeEntry*>& path) { |
| ProfileNode* top_frame_node = top_down_.AddPathFromEnd(path); |
| if (record_samples_) samples_.Add(top_frame_node); |
| } |
| |
| |
| void CpuProfile::CalculateTotalTicksAndSamplingRate() { |
| end_time_ = start_time_ + timer_.Elapsed(); |
| } |
| |
| |
| void CpuProfile::Print() { |
| OS::Print("[Top down]:\n"); |
| top_down_.Print(); |
| } |
| |
| |
| CodeEntry* const CodeMap::kSharedFunctionCodeEntry = NULL; |
| const CodeMap::CodeTreeConfig::Key CodeMap::CodeTreeConfig::kNoKey = NULL; |
| |
| |
| void CodeMap::AddCode(Address addr, CodeEntry* entry, unsigned size) { |
| DeleteAllCoveredCode(addr, addr + size); |
| CodeTree::Locator locator; |
| tree_.Insert(addr, &locator); |
| locator.set_value(CodeEntryInfo(entry, size)); |
| } |
| |
| |
| void CodeMap::DeleteAllCoveredCode(Address start, Address end) { |
| List<Address> to_delete; |
| Address addr = end - 1; |
| while (addr >= start) { |
| CodeTree::Locator locator; |
| if (!tree_.FindGreatestLessThan(addr, &locator)) break; |
| Address start2 = locator.key(), end2 = start2 + locator.value().size; |
| if (start2 < end && start < end2) to_delete.Add(start2); |
| addr = start2 - 1; |
| } |
| for (int i = 0; i < to_delete.length(); ++i) tree_.Remove(to_delete[i]); |
| } |
| |
| |
| CodeEntry* CodeMap::FindEntry(Address addr, Address* start) { |
| CodeTree::Locator locator; |
| if (tree_.FindGreatestLessThan(addr, &locator)) { |
| // locator.key() <= addr. Need to check that addr is within entry. |
| const CodeEntryInfo& entry = locator.value(); |
| if (addr < (locator.key() + entry.size)) { |
| if (start) { |
| *start = locator.key(); |
| } |
| return entry.entry; |
| } |
| } |
| return NULL; |
| } |
| |
| |
| int CodeMap::GetSharedId(Address addr) { |
| CodeTree::Locator locator; |
| // For shared function entries, 'size' field is used to store their IDs. |
| if (tree_.Find(addr, &locator)) { |
| const CodeEntryInfo& entry = locator.value(); |
| ASSERT(entry.entry == kSharedFunctionCodeEntry); |
| return entry.size; |
| } else { |
| tree_.Insert(addr, &locator); |
| int id = next_shared_id_++; |
| locator.set_value(CodeEntryInfo(kSharedFunctionCodeEntry, id)); |
| return id; |
| } |
| } |
| |
| |
| void CodeMap::MoveCode(Address from, Address to) { |
| if (from == to) return; |
| CodeTree::Locator locator; |
| if (!tree_.Find(from, &locator)) return; |
| CodeEntryInfo entry = locator.value(); |
| tree_.Remove(from); |
| AddCode(to, entry.entry, entry.size); |
| } |
| |
| |
| void CodeMap::CodeTreePrinter::Call( |
| const Address& key, const CodeMap::CodeEntryInfo& value) { |
| // For shared function entries, 'size' field is used to store their IDs. |
| if (value.entry == kSharedFunctionCodeEntry) { |
| OS::Print("%p SharedFunctionInfo %d\n", key, value.size); |
| } else { |
| OS::Print("%p %5d %s\n", key, value.size, value.entry->name()); |
| } |
| } |
| |
| |
| void CodeMap::Print() { |
| CodeTreePrinter printer; |
| tree_.ForEach(&printer); |
| } |
| |
| |
| CpuProfilesCollection::CpuProfilesCollection(Heap* heap) |
| : function_and_resource_names_(heap), |
| current_profiles_semaphore_(1) { |
| } |
| |
| |
| static void DeleteCodeEntry(CodeEntry** entry_ptr) { |
| delete *entry_ptr; |
| } |
| |
| |
| static void DeleteCpuProfile(CpuProfile** profile_ptr) { |
| delete *profile_ptr; |
| } |
| |
| |
| CpuProfilesCollection::~CpuProfilesCollection() { |
| finished_profiles_.Iterate(DeleteCpuProfile); |
| current_profiles_.Iterate(DeleteCpuProfile); |
| code_entries_.Iterate(DeleteCodeEntry); |
| } |
| |
| |
| bool CpuProfilesCollection::StartProfiling(const char* title, unsigned uid, |
| bool record_samples) { |
| ASSERT(uid > 0); |
| current_profiles_semaphore_.Wait(); |
| if (current_profiles_.length() >= kMaxSimultaneousProfiles) { |
| current_profiles_semaphore_.Signal(); |
| return false; |
| } |
| for (int i = 0; i < current_profiles_.length(); ++i) { |
| if (strcmp(current_profiles_[i]->title(), title) == 0) { |
| // Ignore attempts to start profile with the same title. |
| current_profiles_semaphore_.Signal(); |
| return false; |
| } |
| } |
| current_profiles_.Add(new CpuProfile(title, uid, record_samples)); |
| current_profiles_semaphore_.Signal(); |
| return true; |
| } |
| |
| |
| CpuProfile* CpuProfilesCollection::StopProfiling(const char* title) { |
| const int title_len = StrLength(title); |
| CpuProfile* profile = NULL; |
| current_profiles_semaphore_.Wait(); |
| for (int i = current_profiles_.length() - 1; i >= 0; --i) { |
| if (title_len == 0 || strcmp(current_profiles_[i]->title(), title) == 0) { |
| profile = current_profiles_.Remove(i); |
| break; |
| } |
| } |
| current_profiles_semaphore_.Signal(); |
| |
| if (profile == NULL) return NULL; |
| profile->CalculateTotalTicksAndSamplingRate(); |
| finished_profiles_.Add(profile); |
| return profile; |
| } |
| |
| |
| bool CpuProfilesCollection::IsLastProfile(const char* title) { |
| // Called from VM thread, and only it can mutate the list, |
| // so no locking is needed here. |
| if (current_profiles_.length() != 1) return false; |
| return StrLength(title) == 0 |
| || strcmp(current_profiles_[0]->title(), title) == 0; |
| } |
| |
| |
| void CpuProfilesCollection::RemoveProfile(CpuProfile* profile) { |
| // Called from VM thread for a completed profile. |
| unsigned uid = profile->uid(); |
| for (int i = 0; i < finished_profiles_.length(); i++) { |
| if (uid == finished_profiles_[i]->uid()) { |
| finished_profiles_.Remove(i); |
| return; |
| } |
| } |
| UNREACHABLE(); |
| } |
| |
| |
| void CpuProfilesCollection::AddPathToCurrentProfiles( |
| const Vector<CodeEntry*>& path) { |
| // As starting / stopping profiles is rare relatively to this |
| // method, we don't bother minimizing the duration of lock holding, |
| // e.g. copying contents of the list to a local vector. |
| current_profiles_semaphore_.Wait(); |
| for (int i = 0; i < current_profiles_.length(); ++i) { |
| current_profiles_[i]->AddPath(path); |
| } |
| current_profiles_semaphore_.Signal(); |
| } |
| |
| |
| CodeEntry* CpuProfilesCollection::NewCodeEntry( |
| Logger::LogEventsAndTags tag, |
| const char* name, |
| const char* name_prefix, |
| const char* resource_name, |
| int line_number) { |
| CodeEntry* code_entry = new CodeEntry(tag, |
| name, |
| name_prefix, |
| resource_name, |
| line_number); |
| code_entries_.Add(code_entry); |
| return code_entry; |
| } |
| |
| |
| const char* const ProfileGenerator::kAnonymousFunctionName = |
| "(anonymous function)"; |
| const char* const ProfileGenerator::kProgramEntryName = |
| "(program)"; |
| const char* const ProfileGenerator::kIdleEntryName = |
| "(idle)"; |
| const char* const ProfileGenerator::kGarbageCollectorEntryName = |
| "(garbage collector)"; |
| const char* const ProfileGenerator::kUnresolvedFunctionName = |
| "(unresolved function)"; |
| |
| |
| ProfileGenerator::ProfileGenerator(CpuProfilesCollection* profiles) |
| : profiles_(profiles), |
| program_entry_( |
| profiles->NewCodeEntry(Logger::FUNCTION_TAG, kProgramEntryName)), |
| idle_entry_( |
| profiles->NewCodeEntry(Logger::FUNCTION_TAG, kIdleEntryName)), |
| gc_entry_( |
| profiles->NewCodeEntry(Logger::BUILTIN_TAG, |
| kGarbageCollectorEntryName)), |
| unresolved_entry_( |
| profiles->NewCodeEntry(Logger::FUNCTION_TAG, |
| kUnresolvedFunctionName)) { |
| } |
| |
| |
| void ProfileGenerator::RecordTickSample(const TickSample& sample) { |
| // Allocate space for stack frames + pc + function + vm-state. |
| ScopedVector<CodeEntry*> entries(sample.frames_count + 3); |
| // As actual number of decoded code entries may vary, initialize |
| // entries vector with NULL values. |
| CodeEntry** entry = entries.start(); |
| memset(entry, 0, entries.length() * sizeof(*entry)); |
| if (sample.pc != NULL) { |
| if (sample.has_external_callback && sample.state == EXTERNAL && |
| sample.top_frame_type == StackFrame::EXIT) { |
| // Don't use PC when in external callback code, as it can point |
| // inside callback's code, and we will erroneously report |
| // that a callback calls itself. |
| *entry++ = code_map_.FindEntry(sample.external_callback); |
| } else { |
| Address start; |
| CodeEntry* pc_entry = code_map_.FindEntry(sample.pc, &start); |
| // If pc is in the function code before it set up stack frame or after the |
| // frame was destroyed SafeStackFrameIterator incorrectly thinks that |
| // ebp contains return address of the current function and skips caller's |
| // frame. Check for this case and just skip such samples. |
| if (pc_entry) { |
| List<OffsetRange>* ranges = pc_entry->no_frame_ranges(); |
| if (ranges) { |
| Code* code = Code::cast(HeapObject::FromAddress(start)); |
| int pc_offset = static_cast<int>( |
| sample.pc - code->instruction_start()); |
| for (int i = 0; i < ranges->length(); i++) { |
| OffsetRange& range = ranges->at(i); |
| if (range.from <= pc_offset && pc_offset < range.to) { |
| return; |
| } |
| } |
| } |
| *entry++ = pc_entry; |
| |
| if (pc_entry->builtin_id() == Builtins::kFunctionCall || |
| pc_entry->builtin_id() == Builtins::kFunctionApply) { |
| // When current function is FunctionCall or FunctionApply builtin the |
| // top frame is either frame of the calling JS function or internal |
| // frame. In the latter case we know the caller for sure but in the |
| // former case we don't so we simply replace the frame with |
| // 'unresolved' entry. |
| if (sample.top_frame_type == StackFrame::JAVA_SCRIPT) { |
| *entry++ = unresolved_entry_; |
| } |
| } |
| } |
| } |
| |
| for (const Address* stack_pos = sample.stack, |
| *stack_end = stack_pos + sample.frames_count; |
| stack_pos != stack_end; |
| ++stack_pos) { |
| *entry++ = code_map_.FindEntry(*stack_pos); |
| } |
| } |
| |
| if (FLAG_prof_browser_mode) { |
| bool no_symbolized_entries = true; |
| for (CodeEntry** e = entries.start(); e != entry; ++e) { |
| if (*e != NULL) { |
| no_symbolized_entries = false; |
| break; |
| } |
| } |
| // If no frames were symbolized, put the VM state entry in. |
| if (no_symbolized_entries) { |
| *entry++ = EntryForVMState(sample.state); |
| } |
| } |
| |
| profiles_->AddPathToCurrentProfiles(entries); |
| } |
| |
| |
| } } // namespace v8::internal |