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// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#ifndef VM_TRACE_BUFFER_H_
#define VM_TRACE_BUFFER_H_
#include "platform/assert.h"
#include "platform/globals.h"
#include "vm/json_stream.h"
namespace dart {
class JSONStream;
class Script;
struct TraceBufferEntry {
int64_t micros;
char* message;
bool message_is_escaped;
bool empty() const {
return message == NULL;
}
};
class TraceBuffer {
public:
static const intptr_t kDefaultCapacity = 1024;
static void Init(Isolate* isolate, intptr_t capacity = kDefaultCapacity);
~TraceBuffer();
void Clear();
// Internally message is copied.
void Trace(int64_t micros, const char* msg, bool msg_is_escaped = false);
// Internally message is copied.
void Trace(const char* msg, bool msg_is_escaped = false);
void TraceF(const char* format, ...) PRINTF_ATTRIBUTE(2, 3);
void PrintToJSONStream(JSONStream* stream) const;
// Accessors for testing.
TraceBufferEntry* At(intptr_t i) const { return &ring_[RingIndex(i)]; }
intptr_t Length() const { return ring_cursor_; }
private:
TraceBuffer(Isolate* isolate, intptr_t capacity);
void Cleanup();
void Fill(TraceBufferEntry* entry, int64_t micros,
char* msg, bool msg_is_escaped = false);
void AppendTrace(int64_t micros, char* msg, bool msg_is_escaped = false);
Isolate* isolate_;
TraceBufferEntry* ring_;
const intptr_t ring_capacity_;
intptr_t ring_cursor_;
intptr_t RingIndex(intptr_t i) const {
return i % ring_capacity_;
}
DISALLOW_COPY_AND_ASSIGN(TraceBuffer);
};
} // namespace dart
#endif // VM_TRACE_BUFFER_H_