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81 lines
2.8 KiB
81 lines
2.8 KiB
4 months ago
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/*
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* Copyright (C) 2012 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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#ifndef ART_RUNTIME_INTERPRETER_INTERPRETER_SWITCH_IMPL_H_
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#define ART_RUNTIME_INTERPRETER_INTERPRETER_SWITCH_IMPL_H_
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#include "base/locks.h"
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#include "base/macros.h"
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#include "dex/dex_file.h"
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#include "dex/code_item_accessors.h"
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#include "jvalue.h"
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#include "obj_ptr.h"
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namespace art {
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class ShadowFrame;
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class Thread;
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namespace interpreter {
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// Group all the data that is needed in the switch interpreter.
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// We need to pass it to the hand-written assembly and back,
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// so it is easier to pass it through a single pointer.
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// Similarly, returning the JValue type would be non-trivial.
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struct SwitchImplContext {
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Thread* self;
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const CodeItemDataAccessor& accessor;
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ShadowFrame& shadow_frame;
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JValue& result_register;
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bool interpret_one_instruction;
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JValue result;
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};
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// The actual internal implementation of the switch interpreter.
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template<bool do_access_check, bool transaction_active>
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void ExecuteSwitchImplCpp(SwitchImplContext* ctx)
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REQUIRES_SHARED(Locks::mutator_lock_);
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// Hand-written assembly method which wraps the C++ implementation,
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// while defining the DEX PC in the CFI so that libunwind can resolve it.
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extern "C" void ExecuteSwitchImplAsm(SwitchImplContext* ctx, void* impl, const uint16_t* dexpc)
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REQUIRES_SHARED(Locks::mutator_lock_);
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// Wrapper around the switch interpreter which ensures we can unwind through it.
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template<bool do_access_check, bool transaction_active>
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ALWAYS_INLINE JValue ExecuteSwitchImpl(Thread* self, const CodeItemDataAccessor& accessor,
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ShadowFrame& shadow_frame, JValue result_register,
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bool interpret_one_instruction)
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REQUIRES_SHARED(Locks::mutator_lock_) {
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SwitchImplContext ctx {
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.self = self,
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.accessor = accessor,
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.shadow_frame = shadow_frame,
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.result_register = result_register,
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.interpret_one_instruction = interpret_one_instruction,
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.result = JValue(),
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};
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void* impl = reinterpret_cast<void*>(&ExecuteSwitchImplCpp<do_access_check, transaction_active>);
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const uint16_t* dex_pc = ctx.accessor.Insns();
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ExecuteSwitchImplAsm(&ctx, impl, dex_pc);
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return ctx.result;
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}
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} // namespace interpreter
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} // namespace art
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#endif // ART_RUNTIME_INTERPRETER_INTERPRETER_SWITCH_IMPL_H_
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