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