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/*
* Copyright (C) 2012 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.
*/
#ifndef ART_COMPILER_DRIVER_DEX_COMPILATION_UNIT_H_
#define ART_COMPILER_DRIVER_DEX_COMPILATION_UNIT_H_
#include <stdint.h>
#include "base/arena_object.h"
#include "base/macros.h"
#include "dex/code_item_accessors.h"
#include "dex/dex_file.h"
#include "handle.h"
namespace art HIDDEN {
namespace mirror {
class Class;
class ClassLoader;
class DexCache;
} // namespace mirror
class ClassLinker;
class VerifiedMethod;
class DexCompilationUnit : public DeletableArenaObject<kArenaAllocMisc> {
public:
DexCompilationUnit(Handle<mirror::ClassLoader> class_loader,
ClassLinker* class_linker,
const DexFile& dex_file,
const dex::CodeItem* code_item,
uint16_t class_def_idx,
uint32_t method_idx,
uint32_t access_flags,
const VerifiedMethod* verified_method,
Handle<mirror::DexCache> dex_cache,
Handle<mirror::Class> compiling_class = Handle<mirror::Class>());
Handle<mirror::ClassLoader> GetClassLoader() const {
return class_loader_;
}
ClassLinker* GetClassLinker() const {
return class_linker_;
}
const DexFile* GetDexFile() const {
return dex_file_;
}
uint16_t GetClassDefIndex() const {
return class_def_idx_;
}
uint32_t GetDexMethodIndex() const {
return dex_method_idx_;
}
const dex::CodeItem* GetCodeItem() const {
return code_item_;
}
const char* GetShorty() const {
const dex::MethodId& method_id = dex_file_->GetMethodId(dex_method_idx_);
return dex_file_->GetMethodShorty(method_id);
}
const char* GetShorty(uint32_t* shorty_len) const {
const dex::MethodId& method_id = dex_file_->GetMethodId(dex_method_idx_);
return dex_file_->GetMethodShorty(method_id, shorty_len);
}
uint32_t GetAccessFlags() const {
return access_flags_;
}
bool IsConstructor() const {
return ((access_flags_ & kAccConstructor) != 0);
}
bool IsNative() const {
return ((access_flags_ & kAccNative) != 0);
}
bool IsStatic() const {
return ((access_flags_ & kAccStatic) != 0);
}
bool IsSynchronized() const {
return ((access_flags_ & kAccSynchronized) != 0);
}
const VerifiedMethod* GetVerifiedMethod() const {
return verified_method_;
}
void ClearVerifiedMethod() {
verified_method_ = nullptr;
}
const std::string& GetSymbol();
Handle<mirror::DexCache> GetDexCache() const {
return dex_cache_;
}
const CodeItemDataAccessor& GetCodeItemAccessor() const {
return code_item_accessor_;
}
Handle<mirror::Class> GetCompilingClass() const {
return compiling_class_;
}
// Does this <init> method require a constructor barrier (prior to the return)?
// The answer is "yes", if and only if the class has any instance final fields.
// (This must not be called for any non-<init> methods; the answer would be "no").
//
// ---
//
// JLS 17.5.1 "Semantics of final fields" mandates that all final fields are frozen at the end
// of the invoked constructor. The constructor barrier is a conservative implementation means of
// enforcing the freezes happen-before the object being constructed is observable by another
// thread.
//
// Note: This question only makes sense for instance constructors;
// static constructors (despite possibly having finals) never need
// a barrier.
//
// JLS 12.4.2 "Detailed Initialization Procedure" approximately describes
// class initialization as:
//
// lock(class.lock)
// class.state = initializing
// unlock(class.lock)
//
// invoke <clinit>
//
// lock(class.lock)
// class.state = initialized
// unlock(class.lock) <-- acts as a release
//
// The last operation in the above example acts as an atomic release
// for any stores in <clinit>, which ends up being stricter
// than what a constructor barrier needs.
//
// See also QuasiAtomic::ThreadFenceForConstructor().
bool RequiresConstructorBarrier() const;
private:
const Handle<mirror::ClassLoader> class_loader_;
ClassLinker* const class_linker_;
const DexFile* const dex_file_;
const dex::CodeItem* const code_item_;
const uint16_t class_def_idx_;
const uint32_t dex_method_idx_;
const uint32_t access_flags_;
const VerifiedMethod* verified_method_;
const Handle<mirror::DexCache> dex_cache_;
const CodeItemDataAccessor code_item_accessor_;
Handle<mirror::Class> compiling_class_;
std::string symbol_;
};
} // namespace art
#endif // ART_COMPILER_DRIVER_DEX_COMPILATION_UNIT_H_
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