johnmccutchan@google.com
20efd2f0c4
BUG= R=srdjan@google.com Review URL: https://codereview.chromium.org//913603002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@43624 260f80e4-7a28-3924-810f-c04153c831b5
104 lines
2.2 KiB
C++
104 lines
2.2 KiB
C++
// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef VM_LOG_H_
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#define VM_LOG_H_
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#include "vm/allocation.h"
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#include "vm/growable_array.h"
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#include "vm/os.h"
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namespace dart {
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class Isolate;
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class LogBlock;
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class Thread;
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#if defined(_MSC_VER)
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#define ISL_Print(format, ...) \
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Isolate::Current()->Log()->Print(format, __VA_ARGS__)
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#else
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#define ISL_Print(format, ...) \
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Isolate::Current()->Log()->Print(format, ##__VA_ARGS__)
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#endif
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#define ISL_VPrint(format, args) \
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Isolate::Current()->Log()->VPrint(format, args)
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typedef void (*LogPrinter)(const char* str, ...);
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class Log {
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public:
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explicit Log(LogPrinter printer = OS::Print);
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// Append a formatted string to the log.
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void Print(const char* format, ...) PRINTF_ATTRIBUTE(2, 3);
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void VPrint(const char* format, va_list args);
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// Flush and truncate the log. The log is flushed starting at cursor
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// and truncated to cursor afterwards.
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void Flush(const intptr_t cursor = 0);
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// Clears the log.
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void Clear();
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// Current cursor.
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intptr_t cursor() const;
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// A logger that does nothing.
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static Log* NoOpLog();
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private:
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void TerminateString();
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void EnableManualFlush();
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void DisableManualFlush();
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static Log noop_log_;
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LogPrinter printer_;
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intptr_t manual_flush_;
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MallocGrowableArray<char> buffer_;
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friend class LogBlock;
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friend class LogTestHelper;
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DISALLOW_COPY_AND_ASSIGN(Log);
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};
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// Causes all log messages to be buffered until destructor is called.
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// Can be nested.
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class LogBlock : public StackResource {
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public:
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LogBlock(Isolate* isolate, Log* log)
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: StackResource(isolate),
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log_(log), cursor_(log->cursor()) {
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CommonConstructor();
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}
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explicit LogBlock(Isolate* isolate);
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explicit LogBlock(Thread* thread);
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LogBlock(Thread* thread, Log* log);
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~LogBlock() {
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CommonDestructor();
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}
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private:
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void CommonConstructor() {
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log_->EnableManualFlush();
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}
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void CommonDestructor() {
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log_->Flush(cursor_);
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log_->DisableManualFlush();
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}
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Log* log_;
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const intptr_t cursor_;
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};
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} // namespace dart
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#endif // VM_LOG_H_
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