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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_SRC_COMPILER_LLVM_MD_BUILDER_H_
#define ART_SRC_COMPILER_LLVM_MD_BUILDER_H_
#include "backend_types.h"
#include "llvm/IR/MDBuilder.h"
#include <cstring>
namespace llvm {
class LLVMContext;
class MDNode;
}
namespace art {
namespace llvm {
typedef ::llvm::MDBuilder LLVMMDBuilder;
class MDBuilder : public LLVMMDBuilder {
public:
MDBuilder(::llvm::LLVMContext& context)
: LLVMMDBuilder(context), tbaa_root_(createTBAARoot("Art TBAA Root")) {
std::memset(tbaa_special_type_, 0, sizeof(tbaa_special_type_));
std::memset(tbaa_memory_jtype_, 0, sizeof(tbaa_memory_jtype_));
// Pre-generate the MDNode for static branch prediction
// 64 and 4 are the llvm.expect's default values
expect_cond_[kLikely] = createBranchWeights(64, 4);
expect_cond_[kUnlikely] = createBranchWeights(4, 64);
}
::llvm::MDNode* GetTBAASpecialType(TBAASpecialType special_ty);
::llvm::MDNode* GetTBAAMemoryJType(TBAASpecialType special_ty, JType j_ty);
::llvm::MDNode* GetBranchWeights(ExpectCond expect) {
DCHECK_LT(expect, MAX_EXPECT) << "MAX_EXPECT is not for branch weight";
return expect_cond_[expect];
}
private:
::llvm::MDNode* const tbaa_root_;
::llvm::MDNode* tbaa_special_type_[MAX_TBAA_SPECIAL_TYPE];
// There are 3 categories of memory types will not alias: array element, instance field, and
// static field.
::llvm::MDNode* tbaa_memory_jtype_[3][MAX_JTYPE];
::llvm::MDNode* expect_cond_[MAX_EXPECT];
};
} // namespace llvm
} // namespace art
#endif // ART_SRC_COMPILER_LLVM_MD_BUILDER_H_
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