chromium/v8/src/builtins/builtins-trace.cc

// Copyright 2018 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/api/api-inl.h"
#include "src/builtins/builtins-utils-inl.h"
#include "src/builtins/builtins.h"
#include "src/heap/heap-inl.h"  // For ToBoolean. TODO(jkummerow): Drop.
#include "src/json/json-stringifier.h"
#include "src/logging/counters.h"
#include "src/objects/objects-inl.h"
#include "src/tracing/traced-value.h"

#if defined(V8_USE_PERFETTO)
#include "protos/perfetto/trace/track_event/debug_annotation.pbzero.h"
#endif

namespace v8 {
namespace internal {

namespace {

#define MAX_STACK_LENGTH …

class MaybeUtf8 { … };

#if !defined(V8_USE_PERFETTO)
class JsonTraceValue : public ConvertableToTraceFormat {
 public:
  explicit JsonTraceValue(Isolate* isolate, Handle<String> object) {
    // object is a JSON string serialized using JSON.stringify() from within
    // the BUILTIN(Trace) method. This may (likely) contain UTF8 values so
    // to grab the appropriate buffer data we have to serialize it out. We
    // hold on to the bits until the AppendAsTraceFormat method is called.
    MaybeUtf8 data(isolate, object);
    data_ = *data;
  }

  void AppendAsTraceFormat(std::string* out) const override { *out += data_; }

 private:
  std::string data_;
};

const uint8_t* GetCategoryGroupEnabled(Isolate* isolate,
                                       Handle<String> string) {
  MaybeUtf8 category(isolate, string);
  return TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(*category);
}
#endif  // !defined(V8_USE_PERFETTO)

#undef MAX_STACK_LENGTH

}  // namespace

// Builins::kIsTraceCategoryEnabled(category) : bool
BUILTIN(IsTraceCategoryEnabled) { … }

// Builtin::kTrace(phase, category, name, id, data) : bool
BUILTIN(Trace) { … }

}  // namespace internal
}  // namespace v8