121 lines
4.4 KiB
C++
121 lines
4.4 KiB
C++
/*
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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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#include "runtime_support_builder_arm.h"
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#include "ir_builder.h"
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#include "thread.h"
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#include "utils_llvm.h"
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#include <llvm/IR/DerivedTypes.h>
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#include <llvm/IR/Function.h>
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#include <llvm/IR/InlineAsm.h>
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#include <llvm/IR/Module.h>
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#include <llvm/IR/Type.h>
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#include <vector>
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using ::llvm::CallInst;
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using ::llvm::Function;
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using ::llvm::FunctionType;
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using ::llvm::InlineAsm;
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using ::llvm::IntegerType;
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using ::llvm::Type;
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using ::llvm::Value;
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namespace {
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char LDRSTRSuffixByType(art::llvm::IRBuilder& irb, Type* type) {
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int width = type->isPointerTy() ?
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irb.getSizeOfPtrEquivInt()*8 :
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::llvm::cast<IntegerType>(type)->getBitWidth();
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switch (width) {
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case 8: return 'b';
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case 16: return 'h';
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case 32: return ' ';
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default:
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LOG(FATAL) << "Unsupported width: " << width;
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return ' ';
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}
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}
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} // namespace
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namespace art {
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namespace llvm {
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/* Thread */
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Value* RuntimeSupportBuilderARM::EmitGetCurrentThread() {
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Function* ori_func = GetRuntimeSupportFunction(runtime_support::GetCurrentThread);
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InlineAsm* func = InlineAsm::get(ori_func->getFunctionType(), "mov $0, r9", "=r", false);
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CallInst* thread = irb_.CreateCall(func);
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thread->setDoesNotAccessMemory();
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irb_.SetTBAA(thread, kTBAAConstJObject);
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return thread;
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}
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Value* RuntimeSupportBuilderARM::EmitLoadFromThreadOffset(int64_t offset, ::llvm::Type* type,
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TBAASpecialType s_ty) {
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FunctionType* func_ty = FunctionType::get(/*Result=*/type,
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/*isVarArg=*/false);
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std::string inline_asm(StringPrintf("ldr%c $0, [r9, #%d]",
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LDRSTRSuffixByType(irb_, type),
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static_cast<int>(offset)));
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InlineAsm* func = InlineAsm::get(func_ty, inline_asm, "=r", true);
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CallInst* result = irb_.CreateCall(func);
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result->setOnlyReadsMemory();
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irb_.SetTBAA(result, s_ty);
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return result;
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}
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void RuntimeSupportBuilderARM::EmitStoreToThreadOffset(int64_t offset, Value* value,
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TBAASpecialType s_ty) {
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FunctionType* func_ty = FunctionType::get(/*Result=*/Type::getVoidTy(context_),
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/*Params=*/value->getType(),
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/*isVarArg=*/false);
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std::string inline_asm(StringPrintf("str%c $0, [r9, #%d]",
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LDRSTRSuffixByType(irb_, value->getType()),
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static_cast<int>(offset)));
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InlineAsm* func = InlineAsm::get(func_ty, inline_asm, "r", true);
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CallInst* call_inst = irb_.CreateCall(func, value);
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irb_.SetTBAA(call_inst, s_ty);
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}
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Value* RuntimeSupportBuilderARM::EmitSetCurrentThread(Value* thread) {
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// Separate to two InlineAsm: The first one produces the return value, while the second,
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// sets the current thread.
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// LLVM can delete the first one if the caller in LLVM IR doesn't use the return value.
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//
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// Here we don't call EmitGetCurrentThread, because we mark it as DoesNotAccessMemory and
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// ConstJObject. We denote side effect to "true" below instead, so LLVM won't
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// reorder these instructions incorrectly.
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Function* ori_func = GetRuntimeSupportFunction(runtime_support::GetCurrentThread);
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InlineAsm* func = InlineAsm::get(ori_func->getFunctionType(), "mov $0, r9", "=r", true);
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CallInst* old_thread_register = irb_.CreateCall(func);
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old_thread_register->setOnlyReadsMemory();
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FunctionType* func_ty = FunctionType::get(/*Result=*/Type::getVoidTy(context_),
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/*Params=*/irb_.getJObjectTy(),
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/*isVarArg=*/false);
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func = InlineAsm::get(func_ty, "mov r9, $0", "r", true);
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irb_.CreateCall(func, thread);
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return old_thread_register;
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}
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} // namespace llvm
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} // namespace art
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