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