blob: a2f18fad5b73ae9c5ad740cf1358f91a006bbd9a [file] [log] [blame]
// Copyright (c) 2015, 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_LOG_H_
#define VM_LOG_H_
#include "vm/allocation.h"
#include "vm/growable_array.h"
#include "vm/os.h"
namespace dart {
class LogBlock;
class Thread;
#if defined(_MSC_VER)
#define THR_Print(format, ...) \
Log::Current()->Print(format, __VA_ARGS__)
#else
#define THR_Print(format, ...) \
Log::Current()->Print(format, ##__VA_ARGS__)
#endif
#define THR_VPrint(format, args) \
Log::Current()->VPrint(format, args)
typedef void (*LogPrinter)(const char* str, ...);
class Log {
public:
explicit Log(LogPrinter printer = OS::Print);
~Log();
static Log* Current();
// Append a formatted string to the log.
void Print(const char* format, ...) PRINTF_ATTRIBUTE(2, 3);
void VPrint(const char* format, va_list args);
// Flush and truncate the log. The log is flushed starting at cursor
// and truncated to cursor afterwards.
void Flush(const intptr_t cursor = 0);
// Clears the log.
void Clear();
// Current cursor.
intptr_t cursor() const;
// A logger that does nothing.
static Log* NoOpLog();
private:
void TerminateString();
void EnableManualFlush();
void DisableManualFlush();
// Returns false if we should drop log messages related to 'isolate'.
static bool ShouldLogForIsolate(const Isolate* isolate);
static Log noop_log_;
LogPrinter printer_;
intptr_t manual_flush_;
MallocGrowableArray<char> buffer_;
friend class LogBlock;
friend class LogTestHelper;
DISALLOW_COPY_AND_ASSIGN(Log);
};
// Causes all log messages to be buffered until destructor is called.
// Can be nested.
class LogBlock : public StackResource {
public:
LogBlock(Thread* thread, Log* log)
: StackResource(thread), log_(log), cursor_(log->cursor()) {
Initialize();
}
LogBlock()
: StackResource(Thread::Current()),
log_(Log::Current()),
cursor_(Log::Current()->cursor()) {
Initialize();
}
~LogBlock();
private:
void Initialize();
Log* const log_;
const intptr_t cursor_;
};
} // namespace dart
#endif // VM_LOG_H_