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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "net/disk_cache/trace.h"
#if defined(OS_WIN)
#include <windows.h>
#endif
#include "base/logging.h"
#include "base/notimplemented.h"
// Change this value to 1 to enable tracing on a release build. By default,
// tracing is enabled only on debug builds.
#define ENABLE_TRACING 0
#ifndef NDEBUG
#undef ENABLE_TRACING
#define ENABLE_TRACING 1
#endif
namespace {
const int kEntrySize = 48;
const int kNumberOfEntries = 5000; // 240 KB.
struct TraceBuffer {
int num_traces;
int current;
char buffer[kNumberOfEntries][kEntrySize];
};
TraceBuffer* s_trace_buffer = NULL;
void DebugOutput(const char* msg) {
#if defined(OS_WIN)
OutputDebugStringA(msg);
#else
NOTIMPLEMENTED();
#endif
}
} // namespace
namespace disk_cache {
#if ENABLE_TRACING
bool InitTrace(void) {
DCHECK(!s_trace_buffer);
if (s_trace_buffer)
return false;
s_trace_buffer = new TraceBuffer;
memset(s_trace_buffer, 0, sizeof(*s_trace_buffer));
return true;
}
void DestroyTrace(void) {
DCHECK(s_trace_buffer);
delete s_trace_buffer;
s_trace_buffer = NULL;
}
void Trace(const char* format, ...) {
DCHECK(s_trace_buffer);
va_list ap;
va_start(ap, format);
#if defined(OS_WIN)
vsprintf_s(s_trace_buffer->buffer[s_trace_buffer->current], format, ap);
#else
NOTIMPLEMENTED();
#endif
s_trace_buffer->num_traces++;
s_trace_buffer->current++;
if (s_trace_buffer->current == kNumberOfEntries)
s_trace_buffer->current = 0;
va_end(ap);
}
// Writes the last num_traces to the debugger output.
void DumpTrace(int num_traces) {
DCHECK(s_trace_buffer);
DebugOutput("Last traces:\n");
if (num_traces > kNumberOfEntries || num_traces < 0)
num_traces = kNumberOfEntries;
if (s_trace_buffer->num_traces) {
char line[kEntrySize + 2];
int current = s_trace_buffer->current - num_traces;
if (current < 0)
current += kNumberOfEntries;
for (int i = 0; i < num_traces; i++) {
memcpy(line, s_trace_buffer->buffer[current], kEntrySize);
line[kEntrySize] = '\0';
size_t length = strlen(line);
if (length) {
line[length] = '\n';
line[length + 1] = '\0';
DebugOutput(line);
}
current++;
if (current == kNumberOfEntries)
current = 0;
}
}
DebugOutput("End of Traces\n");
}
#else // ENABLE_TRACING
bool InitTrace(void) {
return true;
}
void DestroyTrace(void) {
}
void Trace(const char* format, ...) {
}
#endif // ENABLE_TRACING
} // namespace disk_cache
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