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/*
* Copyright 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <dlfcn.h>
#include "logging_macros.h"
#include <cstdio>
#include "trace.h"
static const int TRACE_MAX_SECTION_NAME_LENGTH = 100;
// Tracing functions
static void *(*ATrace_beginSection)(const char *sectionName);
static void *(*ATrace_endSection)(void);
static bool *(*ATrace_isEnabled)(void);
typedef void *(*fp_ATrace_beginSection)(const char *sectionName);
typedef void *(*fp_ATrace_endSection)(void);
typedef bool *(*fp_ATrace_isEnabled)(void);
bool Trace::is_enabled_ = false;
bool Trace::has_error_been_shown_ = false;
void Trace::beginSection(const char *fmt, ...) {
if (is_enabled_) {
static char buff[TRACE_MAX_SECTION_NAME_LENGTH];
va_list args;
va_start(args, fmt);
vsprintf(buff, fmt, args);
va_end(args);
ATrace_beginSection(buff);
} else if (!has_error_been_shown_) {
LOGE("Tracing is either not initialized (call Trace::initialize()) "
"or not supported on this device");
has_error_been_shown_ = true;
}
}
void Trace::endSection() {
if (is_enabled_) {
ATrace_endSection();
}
}
void Trace::initialize() {
// Using dlsym allows us to use tracing on API 21+ without needing android/trace.h which wasn't
// published until API 23
void *lib = dlopen("libandroid.so", RTLD_NOW | RTLD_LOCAL);
if (lib == nullptr) {
LOGE("Could not open libandroid.so to dynamically load tracing symbols");
} else {
ATrace_beginSection =
reinterpret_cast<fp_ATrace_beginSection >(
dlsym(lib, "ATrace_beginSection"));
ATrace_endSection =
reinterpret_cast<fp_ATrace_endSection >(
dlsym(lib, "ATrace_endSection"));
ATrace_isEnabled =
reinterpret_cast<fp_ATrace_isEnabled >(
dlsym(lib, "ATrace_isEnabled"));
if (ATrace_isEnabled != nullptr && ATrace_isEnabled()) {
is_enabled_ = true;
}
}
}
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