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// 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
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