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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_RUNTIME_INTERPRETER_INTERPRETER_SWITCH_IMPL_H_
#define ART_RUNTIME_INTERPRETER_INTERPRETER_SWITCH_IMPL_H_
#include "base/locks.h"
#include "base/macros.h"
#include "dex/dex_file.h"
#include "dex/code_item_accessors.h"
#include "jvalue.h"
#include "obj_ptr.h"
namespace art {
class ShadowFrame;
class Thread;
namespace interpreter {
// Group all the data that is needed in the switch interpreter.
// We need to pass it to the hand-written assembly and back,
// so it is easier to pass it through a single pointer.
// Similarly, returning the JValue type would be non-trivial.
struct SwitchImplContext {
Thread* self;
const CodeItemDataAccessor& accessor;
ShadowFrame& shadow_frame;
JValue& result_register;
bool interpret_one_instruction;
JValue result;
};
// The actual internal implementation of the switch interpreter.
template<bool do_access_check, bool transaction_active>
void ExecuteSwitchImplCpp(SwitchImplContext* ctx)
REQUIRES_SHARED(Locks::mutator_lock_);
// Hand-written assembly method which wraps the C++ implementation,
// while defining the DEX PC in the CFI so that libunwind can resolve it.
extern "C" void ExecuteSwitchImplAsm(SwitchImplContext* ctx, void* impl, const uint16_t* dexpc)
REQUIRES_SHARED(Locks::mutator_lock_);
// Wrapper around the switch interpreter which ensures we can unwind through it.
template<bool do_access_check, bool transaction_active>
ALWAYS_INLINE JValue ExecuteSwitchImpl(Thread* self, const CodeItemDataAccessor& accessor,
ShadowFrame& shadow_frame, JValue result_register,
bool interpret_one_instruction)
REQUIRES_SHARED(Locks::mutator_lock_) {
SwitchImplContext ctx {
.self = self,
.accessor = accessor,
.shadow_frame = shadow_frame,
.result_register = result_register,
.interpret_one_instruction = interpret_one_instruction,
.result = JValue(),
};
void* impl = reinterpret_cast<void*>(&ExecuteSwitchImplCpp<do_access_check, transaction_active>);
const uint16_t* dex_pc = ctx.accessor.Insns();
ExecuteSwitchImplAsm(&ctx, impl, dex_pc);
return ctx.result;
}
} // namespace interpreter
} // namespace art
#endif // ART_RUNTIME_INTERPRETER_INTERPRETER_SWITCH_IMPL_H_
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