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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 "intrinsic_helper.h"
#include "ir_builder.h"
#include <llvm/IR/Attributes.h>
#include <llvm/IR/DerivedTypes.h>
#include <llvm/IR/Function.h>
#include <llvm/IR/IRBuilder.h>
#include <llvm/IR/Intrinsics.h>
namespace art {
namespace llvm {
const IntrinsicHelper::IntrinsicInfo IntrinsicHelper::Info[] = {
#define DEF_INTRINSICS_FUNC(_, NAME, ATTR, RET_TYPE, ARG1_TYPE, ARG2_TYPE, \
ARG3_TYPE, ARG4_TYPE, \
ARG5_TYPE) \
{ #NAME, ATTR, RET_TYPE, { ARG1_TYPE, ARG2_TYPE, \
ARG3_TYPE, ARG4_TYPE, \
ARG5_TYPE} },
#include "intrinsic_func_list.def"
};
static ::llvm::Type* GetLLVMTypeOfIntrinsicValType(IRBuilder& irb,
IntrinsicHelper::IntrinsicValType type) {
switch (type) {
case IntrinsicHelper::kVoidTy: {
return irb.getVoidTy();
}
case IntrinsicHelper::kJavaObjectTy: {
return irb.getJObjectTy();
}
case IntrinsicHelper::kJavaMethodTy: {
return irb.getJMethodTy();
}
case IntrinsicHelper::kJavaThreadTy: {
return irb.getJThreadTy();
}
case IntrinsicHelper::kInt1Ty:
case IntrinsicHelper::kInt1ConstantTy: {
return irb.getInt1Ty();
}
case IntrinsicHelper::kInt8Ty:
case IntrinsicHelper::kInt8ConstantTy: {
return irb.getInt8Ty();
}
case IntrinsicHelper::kInt16Ty:
case IntrinsicHelper::kInt16ConstantTy: {
return irb.getInt16Ty();
}
case IntrinsicHelper::kInt32Ty:
case IntrinsicHelper::kInt32ConstantTy: {
return irb.getInt32Ty();
}
case IntrinsicHelper::kInt64Ty:
case IntrinsicHelper::kInt64ConstantTy: {
return irb.getInt64Ty();
}
case IntrinsicHelper::kFloatTy:
case IntrinsicHelper::kFloatConstantTy: {
return irb.getFloatTy();
}
case IntrinsicHelper::kDoubleTy:
case IntrinsicHelper::kDoubleConstantTy: {
return irb.getDoubleTy();
}
case IntrinsicHelper::kNone:
case IntrinsicHelper::kVarArgTy:
default: {
LOG(FATAL) << "Invalid intrinsic type " << type << "to get LLVM type!";
return NULL;
}
}
// unreachable
}
IntrinsicHelper::IntrinsicHelper(::llvm::LLVMContext& context,
::llvm::Module& module) {
IRBuilder irb(context, module, *this);
::memset(intrinsic_funcs_, 0, sizeof(intrinsic_funcs_));
// This loop does the following things:
// 1. Introduce the intrinsic function into the module
// 2. Add "nocapture" and "noalias" attribute to the arguments in all
// intrinsics functions.
// 3. Initialize intrinsic_funcs_map_.
for (unsigned i = 0; i < MaxIntrinsicId; i++) {
IntrinsicId id = static_cast<IntrinsicId>(i);
const IntrinsicInfo& info = Info[i];
// Parse and construct the argument type from IntrinsicInfo
::llvm::Type* arg_type[kIntrinsicMaxArgc];
unsigned num_args = 0;
bool is_var_arg = false;
for (unsigned arg_iter = 0; arg_iter < kIntrinsicMaxArgc; arg_iter++) {
IntrinsicValType type = info.arg_type_[arg_iter];
if (type == kNone) {
break;
} else if (type == kVarArgTy) {
// Variable argument type must be the last argument
is_var_arg = true;
break;
}
arg_type[num_args++] = GetLLVMTypeOfIntrinsicValType(irb, type);
}
// Construct the function type
::llvm::Type* ret_type =
GetLLVMTypeOfIntrinsicValType(irb, info.ret_val_type_);
::llvm::FunctionType* type =
::llvm::FunctionType::get(ret_type,
::llvm::ArrayRef< ::llvm::Type*>(arg_type, num_args),
is_var_arg);
// Declare the function
::llvm::Function *fn = ::llvm::Function::Create(type,
::llvm::Function::ExternalLinkage,
info.name_, &module);
if (info.attr_ & kAttrReadOnly) {
fn->setOnlyReadsMemory();
}
if (info.attr_ & kAttrReadNone) {
fn->setDoesNotAccessMemory();
}
// None of the intrinsics throws exception
fn->setDoesNotThrow();
intrinsic_funcs_[id] = fn;
DCHECK_NE(fn, static_cast< ::llvm::Function*>(NULL)) << "Intrinsic `"
<< GetName(id) << "' was not defined!";
// Add "noalias" and "nocapture" attribute to all arguments of pointer type
for (::llvm::Function::arg_iterator arg_iter = fn->arg_begin(),
arg_end = fn->arg_end(); arg_iter != arg_end; arg_iter++) {
if (arg_iter->getType()->isPointerTy()) {
std::vector< ::llvm::Attribute::AttrKind> attributes;
attributes.push_back(::llvm::Attribute::NoCapture);
attributes.push_back(::llvm::Attribute::NoAlias);
::llvm::AttributeSet attribute_set = ::llvm::AttributeSet::get(fn->getContext(),
arg_iter->getArgNo(),
attributes);
arg_iter->addAttr(attribute_set);
}
}
// Insert the newly created intrinsic to intrinsic_funcs_map_
if (!intrinsic_funcs_map_.insert(std::make_pair(fn, id)).second) {
LOG(FATAL) << "Duplicate entry in intrinsic functions map?";
}
}
return;
}
} // namespace llvm
} // namespace art
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