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#ifndef ANDROID_PDX_TRACE_H_
#define ANDROID_PDX_TRACE_H_
#include <array>
#include <utils/Trace.h>
// Enables internal tracing in libpdx. This is disabled by default to avoid
// spamming the trace buffers during normal trace activities. libpdx must be
// built with this set to true to enable internal tracing.
#ifndef PDX_LIB_TRACE_ENABLED
#define PDX_LIB_TRACE_ENABLED false
#endif
namespace android {
namespace pdx {
// Utility to generate scoped tracers with arguments.
class ScopedTraceArgs {
public:
template <typename... Args>
ScopedTraceArgs(uint64_t tag, const char* format, Args&&... args)
: tag_{tag} {
if (atrace_is_tag_enabled(tag_)) {
std::array<char, 1024> buffer;
snprintf(buffer.data(), buffer.size(), format,
std::forward<Args>(args)...);
atrace_begin(tag_, buffer.data());
}
}
~ScopedTraceArgs() { atrace_end(tag_); }
private:
uint64_t tag_;
ScopedTraceArgs(const ScopedTraceArgs&) = delete;
void operator=(const ScopedTraceArgs&) = delete;
};
// Utility to generate scoped tracers.
class ScopedTrace {
public:
template <typename... Args>
ScopedTrace(uint64_t tag, bool enabled, const char* name)
: tag_{tag}, enabled_{enabled} {
if (enabled_)
atrace_begin(tag_, name);
}
~ScopedTrace() {
if (enabled_)
atrace_end(tag_);
}
private:
uint64_t tag_;
bool enabled_;
ScopedTrace(const ScopedTrace&) = delete;
void operator=(const ScopedTrace&) = delete;
};
} // namespace pdx
} // namespace android
// Macro to define a scoped tracer with arguments. Uses PASTE(x, y) macro
// defined in utils/Trace.h.
#define PDX_TRACE_FORMAT(format, ...) \
::android::pdx::ScopedTraceArgs PASTE(__tracer, __LINE__) { \
ATRACE_TAG, format, ##__VA_ARGS__ \
}
// TODO(eieio): Rename this to PDX_LIB_TRACE_NAME() for internal use by libpdx
// and rename internal uses inside the library. This version is only enabled
// when PDX_LIB_TRACE_ENABLED is true.
#define PDX_TRACE_NAME(name) \
::android::pdx::ScopedTrace PASTE(__tracer, __LINE__) { \
ATRACE_TAG, PDX_LIB_TRACE_ENABLED, name \
}
#endif // ANDROID_PDX_TRACE_H_
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