| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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 IMPALA_CODEGEN_CODEGEN_UTIL_H |
| #define IMPALA_CODEGEN_CODEGEN_UTIL_H |
| |
| #include <vector> |
| #include <llvm/IR/IRBuilder.h> |
| |
| #include "codegen/llvm-codegen.h" |
| |
| namespace impala { |
| |
| /// Miscellaneous codegen utility functions that don't depend on the rest of the Impala |
| /// codegen infrastructure. |
| class CodeGenUtil { |
| public: |
| /// Wrapper around IRBuilder::CreateCall() that automatically bitcasts arguments |
| /// using CheckedBitCast(). This should be used instead of IRBuilder::CreateCall() |
| /// when calling functions from a linked module because the LLVM linker may merge |
| /// different struct types with the same memory layout during linking. E.g. if the |
| /// IR UDF module has type TinyIntVal that has the same memory layout as BooleanVal: |
| /// {i8, i8}, then the linker may substitute references to TinyIntVal with BooleanVal |
| /// in the IR UDF. Calling a function which has a BooleanVal* argument with a TinyInt* |
| /// argument without bitcasting then would result in hitting an internal LLVM assertion. |
| static llvm::CallInst* CreateCallWithBitCasts(LlvmBuilder* builder, |
| llvm::Function* callee, llvm::ArrayRef<llvm::Value*> args, |
| const llvm::Twine& name=""); |
| |
| /// Same as IRBuilder::CreateBitCast() except that it checks that the types are either |
| /// exactly the same, or, if they are both struct types (or pointers to struct types), |
| /// that they are structurally identical. Either returns 'value' if no conversion is |
| /// necessary, or returns a bitcast instruction converting 'value' to 'dst_type'. |
| static llvm::Value* CheckedBitCast(LlvmBuilder* builder, |
| llvm::Value* value, llvm::Type* dst_type, const llvm::Twine& name); |
| |
| /// Return true if the two types are structurally identical. |
| static bool TypesAreStructurallyIdentical(llvm::Type *t1, llvm::Type *t2); |
| |
| /// Returns the string representation of a llvm::Value* or llvm::Type* |
| template <typename T> static std::string Print(T* value_or_type) { |
| std::string str; |
| llvm::raw_string_ostream stream(str); |
| value_or_type->print(stream); |
| return str; |
| } |
| |
| }; |
| } |
| |
| #endif |