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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UTIL_TRACE_LOGGING_MACRO_SUPPORT_H_
#define UTIL_TRACE_LOGGING_MACRO_SUPPORT_H_
#ifndef INCLUDING_FROM_UTIL_TRACE_LOGGING_H_
#error "Do not include this header directly. Use util/trace_logging.h."
#endif
#ifndef ENABLE_TRACE_LOGGING
#error "BUG: This file should not have been reached."
#endif
#include "build/config/features.h"
#include "platform/api/trace_logging_platform.h"
#include "platform/base/trace_logging_activation.h"
#include "platform/base/trace_logging_types.h"
#include "util/trace_logging/scoped_trace_operations.h"
// Helper macros. These are used to simplify the macros below.
// NOTE: These cannot be #undef'd or they will stop working outside this file.
// NOTE: Two of these below macros are intentionally the same. This is to work
// around optimizations in the C++ Precompiler.
#define TRACE_INTERNAL_CONCAT(a, b) a##b
#define TRACE_INTERNAL_CONCAT_CONST(a, b) TRACE_INTERNAL_CONCAT(a, b)
#define TRACE_INTERNAL_UNIQUE_VAR_NAME(a) \
TRACE_INTERNAL_CONCAT_CONST(a, __LINE__)
// Because we need to suppress unused variables, and this code is used
// repeatedly in below macros, define helper macros to do this on a per-compiler
// basis until we begin using C++ 17 which supports [[maybe_unused]] officially.
#if defined(__clang__)
#define TRACE_INTERNAL_IGNORE_UNUSED_VAR [[maybe_unused]]
#elif defined(__GNUC__)
#define TRACE_INTERNAL_IGNORE_UNUSED_VAR __attribute__((unused))
#else
#define TRACE_INTERNAL_IGNORE_UNUSED_VAR [[maybe_unused]]
#endif // defined(__clang__)
namespace openscreen {
namespace internal {
inline bool IsTraceLoggingEnabled(TraceCategory::Value category) {
auto* const destination = GetTracingDestination();
return destination && destination->IsTraceLoggingEnabled(category);
}
} // namespace internal
} // namespace openscreen
#define TRACE_IS_ENABLED(category) \
openscreen::internal::IsTraceLoggingEnabled(category)
// Internal logging macros.
#define TRACE_SET_HIERARCHY_INTERNAL(line, ids) \
alignas(32) uint8_t TRACE_INTERNAL_CONCAT_CONST( \
tracing_storage, line)[sizeof(openscreen::internal::TraceIdSetter)]; \
TRACE_INTERNAL_IGNORE_UNUSED_VAR \
const auto TRACE_INTERNAL_UNIQUE_VAR_NAME(trace_ref_) = \
TRACE_IS_ENABLED(openscreen::TraceCategory::Value::Any) \
? openscreen::internal::TraceInstanceHelper< \
openscreen::internal::TraceIdSetter>:: \
Create(TRACE_INTERNAL_CONCAT_CONST(tracing_storage, line), \
ids) \
: openscreen::internal::TraceInstanceHelper< \
openscreen::internal::TraceIdSetter>::Empty()
#define TRACE_SCOPED_INTERNAL(line, category, name, ...) \
alignas(32) uint8_t TRACE_INTERNAL_CONCAT_CONST( \
tracing_storage, \
line)[sizeof(openscreen::internal::SynchronousTraceLogger)]; \
TRACE_INTERNAL_IGNORE_UNUSED_VAR \
const auto TRACE_INTERNAL_UNIQUE_VAR_NAME(trace_ref_) = \
TRACE_IS_ENABLED(category) \
? openscreen::internal::TraceInstanceHelper< \
openscreen::internal::SynchronousTraceLogger>:: \
Create(TRACE_INTERNAL_CONCAT_CONST(tracing_storage, line), \
category, name, __FILE__, __LINE__, ##__VA_ARGS__) \
: openscreen::internal::TraceInstanceHelper< \
openscreen::internal::SynchronousTraceLogger>::Empty()
#define TRACE_ASYNC_START_INTERNAL(line, category, name, ...) \
alignas(32) uint8_t TRACE_INTERNAL_CONCAT_CONST( \
temp_storage, \
line)[sizeof(openscreen::internal::AsynchronousTraceLogger)]; \
TRACE_INTERNAL_IGNORE_UNUSED_VAR \
const auto TRACE_INTERNAL_UNIQUE_VAR_NAME(trace_ref_) = \
TRACE_IS_ENABLED(category) \
? openscreen::internal::TraceInstanceHelper< \
openscreen::internal::AsynchronousTraceLogger>:: \
Create(TRACE_INTERNAL_CONCAT_CONST(temp_storage, line), \
category, name, __FILE__, __LINE__, ##__VA_ARGS__) \
: openscreen::internal::TraceInstanceHelper< \
openscreen::internal::AsynchronousTraceLogger>::Empty()
#endif // UTIL_TRACE_LOGGING_MACRO_SUPPORT_H_
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