/*
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* Copyright (C) 2019 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 "palette/palette.h"
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#include <dlfcn.h>
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#include <stdlib.h>
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#include <android/log.h>
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#include <android-base/macros.h>
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namespace {
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// Logging tag.
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static constexpr const char* kLogTag = "libartpalette";
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// Name of the palette library present in the /system partition.
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static constexpr const char* kPaletteSystemLibrary = "libartpalette-system.so";
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// Generic method used when a dynamically loaded palette instance does not
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// support a method.
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enum PaletteStatus PaletteMethodNotSupported() {
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return PaletteStatus::kNotSupported;
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}
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// Declare type aliases for pointers to each function in the interface.
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#define PALETTE_METHOD_TYPE_ALIAS(Name, ...) \
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using Name ## Method = PaletteStatus(*)(__VA_ARGS__);
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PALETTE_METHOD_LIST(PALETTE_METHOD_TYPE_ALIAS)
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#undef PALETTE_METHOD_TYPE_ALIAS
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// Singleton class responsible for dynamically loading the palette library and
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// binding functions there to method pointers.
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class PaletteLoader {
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public:
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static PaletteLoader& Instance() {
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static PaletteLoader instance;
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return instance;
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}
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// Accessor methods to get instances of palette methods.
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#define PALETTE_LOADER_METHOD_ACCESSOR(Name, ...) \
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Name ## Method Get ## Name ## Method() const { return Name ## Method ## _; }
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PALETTE_METHOD_LIST(PALETTE_LOADER_METHOD_ACCESSOR)
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#undef PALETTE_LOADER_METHOD_ACCESSOR
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private:
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PaletteLoader();
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static void* OpenLibrary();
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static void* GetMethod(void* palette_lib, const char* name);
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// Handle to the palette library from dlopen().
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void* palette_lib_;
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// Fields to store pointers to palette methods.
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#define PALETTE_LOADER_METHOD_FIELD(Name, ...) \
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const Name ## Method Name ## Method ## _;
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PALETTE_METHOD_LIST(PALETTE_LOADER_METHOD_FIELD)
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#undef PALETTE_LOADER_METHOD_FIELD
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DISALLOW_COPY_AND_ASSIGN(PaletteLoader);
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};
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void* PaletteLoader::OpenLibrary() {
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void* handle = dlopen(kPaletteSystemLibrary, RTLD_NOW | RTLD_GLOBAL | RTLD_NODELETE);
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if (handle == nullptr) {
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// dlerror message includes details of error and file being opened.
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__android_log_assert(nullptr, kLogTag, "%s", dlerror());
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}
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return handle;
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}
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void* PaletteLoader::GetMethod(void* palette_lib, const char* name) {
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void* method = nullptr;
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if (palette_lib != nullptr) {
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method = dlsym(palette_lib, name);
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}
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if (method == nullptr) {
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return reinterpret_cast<void*>(PaletteMethodNotSupported);
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}
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// TODO(oth): consider new GetMethodSignature() in the Palette API which
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// would allow sanity checking the type signatures.
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return method;
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}
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PaletteLoader::PaletteLoader() :
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palette_lib_(OpenLibrary())
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#define PALETTE_LOADER_BIND_METHOD(Name, ...) \
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, Name ## Method ## _(reinterpret_cast<Name ## Method>(GetMethod(palette_lib_, #Name)))
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PALETTE_METHOD_LIST(PALETTE_LOADER_BIND_METHOD)
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#undef PALETTE_LOADER_BIND_METHOD
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{
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}
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} // namespace
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extern "C" {
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enum PaletteStatus PaletteGetVersion(/*out*/int32_t* version) {
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PaletteGetVersionMethod m = PaletteLoader::Instance().GetPaletteGetVersionMethod();
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return m(version);
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}
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enum PaletteStatus PaletteSchedSetPriority(int32_t tid, int32_t java_priority) {
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PaletteSchedSetPriorityMethod m = PaletteLoader::Instance().GetPaletteSchedSetPriorityMethod();
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return m(tid, java_priority);
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}
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enum PaletteStatus PaletteSchedGetPriority(int32_t tid, /*out*/int32_t* java_priority) {
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PaletteSchedGetPriorityMethod m = PaletteLoader::Instance().GetPaletteSchedGetPriorityMethod();
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return m(tid, java_priority);
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}
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enum PaletteStatus PaletteWriteCrashThreadStacks(/*in*/const char* stack, size_t stack_len) {
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PaletteWriteCrashThreadStacksMethod m =
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PaletteLoader::Instance().GetPaletteWriteCrashThreadStacksMethod();
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return m(stack, stack_len);
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}
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enum PaletteStatus PaletteTraceEnabled(/*out*/int32_t* enabled) {
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PaletteTraceEnabledMethod m = PaletteLoader::Instance().GetPaletteTraceEnabledMethod();
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return m(enabled);
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}
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enum PaletteStatus PaletteTraceBegin(/*in*/const char* name) {
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PaletteTraceBeginMethod m = PaletteLoader::Instance().GetPaletteTraceBeginMethod();
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return m(name);
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}
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enum PaletteStatus PaletteTraceEnd() {
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PaletteTraceEndMethod m = PaletteLoader::Instance().GetPaletteTraceEndMethod();
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return m();
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}
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enum PaletteStatus PaletteTraceIntegerValue(/*in*/const char* name, int32_t value) {
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PaletteTraceIntegerValueMethod m = PaletteLoader::Instance().GetPaletteTraceIntegerValueMethod();
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return m(name, value);
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}
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} // extern "C"
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