// Copyright 2017 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include "src/debug/debug-type-profile.h" #include "src/execution/isolate.h" #include "src/objects/feedback-vector.h" #include "src/objects/objects-inl.h" #include "src/objects/objects.h" namespace v8 { namespace internal { std::unique_ptr<TypeProfile> TypeProfile::Collect(Isolate* isolate) { std::unique_ptr<TypeProfile> result(new TypeProfile()); // Feedback vectors are already listed to prevent losing them to GC. DCHECK(isolate->factory() ->feedback_vectors_for_profiling_tools() ->IsArrayList()); Handle<ArrayList> list = Handle<ArrayList>::cast( isolate->factory()->feedback_vectors_for_profiling_tools()); Script::Iterator scripts(isolate); for (Script script = scripts.Next(); !script.is_null(); script = scripts.Next()) { if (!script.IsUserJavaScript()) { continue; } Handle<Script> script_handle(script, isolate); TypeProfileScript type_profile_script(script_handle); std::vector<TypeProfileEntry>* entries = &type_profile_script.entries; // TODO(franzih): Sort the vectors by script first instead of iterating // the list multiple times. for (int i = 0; i < list->Length(); i++) { FeedbackVector vector = FeedbackVector::cast(list->Get(i)); SharedFunctionInfo info = vector.shared_function_info(); DCHECK(info.IsSubjectToDebugging()); // Match vectors with script. if (script != info.script()) { continue; } if (!info.HasFeedbackMetadata() || info.feedback_metadata().is_empty() || !info.feedback_metadata().HasTypeProfileSlot()) { continue; } FeedbackSlot slot = vector.GetTypeProfileSlot(); FeedbackNexus nexus(vector, slot); Handle<String> name(info.DebugName(), isolate); std::vector<int> source_positions = nexus.GetSourcePositions(); for (int position : source_positions) { DCHECK_GE(position, 0); entries->emplace_back(position, nexus.GetTypesForSourcePositions( static_cast<uint32_t>(position))); } // Releases type profile data collected so far. nexus.ResetTypeProfile(); } if (!entries->empty()) { result->emplace_back(type_profile_script); } } return result; } void TypeProfile::SelectMode(Isolate* isolate, debug::TypeProfileMode mode) { if (mode != isolate->type_profile_mode()) { // Changing the type profile mode can change the bytecode that would be // generated for a function, which can interfere with lazy source positions, // so just force source position collection whenever there's such a change. isolate->CollectSourcePositionsForAllBytecodeArrays(); } HandleScope handle_scope(isolate); if (mode == debug::TypeProfileMode::kNone) { if (!isolate->factory() ->feedback_vectors_for_profiling_tools() ->IsUndefined(isolate)) { // Release type profile data collected so far. // Feedback vectors are already listed to prevent losing them to GC. DCHECK(isolate->factory() ->feedback_vectors_for_profiling_tools() ->IsArrayList()); Handle<ArrayList> list = Handle<ArrayList>::cast( isolate->factory()->feedback_vectors_for_profiling_tools()); for (int i = 0; i < list->Length(); i++) { FeedbackVector vector = FeedbackVector::cast(list->Get(i)); SharedFunctionInfo info = vector.shared_function_info(); DCHECK(info.IsSubjectToDebugging()); if (info.feedback_metadata().HasTypeProfileSlot()) { FeedbackSlot slot = vector.GetTypeProfileSlot(); FeedbackNexus nexus(vector, slot); nexus.ResetTypeProfile(); } } // Delete the feedback vectors from the list if they're not used by code // coverage. if (isolate->is_best_effort_code_coverage()) { isolate->SetFeedbackVectorsForProfilingTools( ReadOnlyRoots(isolate).undefined_value()); } } } else { DCHECK_EQ(debug::TypeProfileMode::kCollect, mode); isolate->MaybeInitializeVectorListFromHeap(); } isolate->set_type_profile_mode(mode); } } // namespace internal } // namespace v8