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