701148f05a
The ClangIR CFG has to be flat before it can be lowered to LLVM IR. That is, there can be no nested regions and all blocks in a region must belong to the parent region. Currently only cir.scope operations violate these rules, so the initial implementation of the cir-flatten-cfg pass only has to transform scope operations.
69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements lowering of CIR attributes and operations directly to
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// LLVMIR.
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//
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//===----------------------------------------------------------------------===//
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#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
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#include "mlir/IR/DialectRegistry.h"
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#include "mlir/Target/LLVMIR/LLVMTranslationInterface.h"
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#include "mlir/Target/LLVMIR/ModuleTranslation.h"
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#include "clang/CIR/Dialect/IR/CIRAttrs.h"
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#include "clang/CIR/Dialect/IR/CIRDialect.h"
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#include "clang/CIR/MissingFeatures.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/IR/Constant.h"
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#include "llvm/IR/GlobalVariable.h"
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using namespace llvm;
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namespace cir {
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namespace direct {
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/// Implementation of the dialect interface that converts CIR attributes to LLVM
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/// IR metadata.
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class CIRDialectLLVMIRTranslationInterface
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: public mlir::LLVMTranslationDialectInterface {
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public:
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using LLVMTranslationDialectInterface::LLVMTranslationDialectInterface;
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/// Translates the given operation to LLVM IR using the provided IR builder
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/// and saving the state in `moduleTranslation`.
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mlir::LogicalResult convertOperation(
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mlir::Operation *op, llvm::IRBuilderBase &builder,
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mlir::LLVM::ModuleTranslation &moduleTranslation) const final {
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if (auto cirOp = llvm::dyn_cast<mlir::LLVM::ZeroOp>(op))
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moduleTranslation.mapValue(cirOp.getResult()) =
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llvm::Constant::getNullValue(
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moduleTranslation.convertType(cirOp.getType()));
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return mlir::success();
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}
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};
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void registerCIRDialectTranslation(mlir::DialectRegistry ®istry) {
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registry.insert<cir::CIRDialect>();
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registry.addExtension(+[](mlir::MLIRContext *ctx, cir::CIRDialect *dialect) {
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dialect->addInterfaces<CIRDialectLLVMIRTranslationInterface>();
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});
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}
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} // namespace direct
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} // namespace cir
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namespace mlir {
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void registerCIRDialectTranslation(mlir::MLIRContext &context) {
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mlir::DialectRegistry registry;
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cir::direct::registerCIRDialectTranslation(registry);
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context.appendDialectRegistry(registry);
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}
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} // namespace mlir
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