Use MDBuilder to build metadata.
Change-Id: I7e6872bf46c5e064a8cc936edfd18566610d80d5
diff --git a/src/compiler_llvm/md_builder.h b/src/compiler_llvm/md_builder.h
new file mode 100644
index 0000000..5b02500
--- /dev/null
+++ b/src/compiler_llvm/md_builder.h
@@ -0,0 +1,71 @@
+/*
+ * 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/Support/MDBuilder.h"
+
+#include <cstring>
+
+namespace llvm {
+ class LLVMContext;
+ class MDNode;
+}
+
+namespace art {
+namespace compiler_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* 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 compiler_llvm
+} // namespace art
+
+#endif // ART_SRC_COMPILER_LLVM_MD_BUILDER_H_