61 lines
2.1 KiB
C++
61 lines
2.1 KiB
C++
//===- DIExpressionLegalization.cpp - DIExpression Legalization Patterns --===//
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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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#include "mlir/Dialect/LLVMIR/Transforms/DIExpressionLegalization.h"
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#include "llvm/BinaryFormat/Dwarf.h"
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using namespace mlir;
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using namespace LLVM;
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//===----------------------------------------------------------------------===//
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// MergeFragments
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//===----------------------------------------------------------------------===//
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MergeFragments::OpIterT MergeFragments::match(OpIterRange operators) const {
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OpIterT it = operators.begin();
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if (it == operators.end() ||
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it->getOpcode() != llvm::dwarf::DW_OP_LLVM_fragment)
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return operators.begin();
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++it;
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if (it == operators.end() ||
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it->getOpcode() != llvm::dwarf::DW_OP_LLVM_fragment)
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return operators.begin();
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return ++it;
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}
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SmallVector<MergeFragments::OperatorT>
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MergeFragments::replace(OpIterRange operators) const {
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OpIterT it = operators.begin();
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OperatorT first = *(it++);
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OperatorT second = *it;
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// Add offsets & select the size of the earlier operator (the one closer to
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// the IR value).
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uint64_t offset = first.getArguments()[0] + second.getArguments()[0];
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uint64_t size = first.getArguments()[1];
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OperatorT newOp = OperatorT::get(
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first.getContext(), llvm::dwarf::DW_OP_LLVM_fragment, {offset, size});
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return SmallVector<OperatorT>{newOp};
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}
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//===----------------------------------------------------------------------===//
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// Runner
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//===----------------------------------------------------------------------===//
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void mlir::LLVM::legalizeDIExpressionsRecursively(Operation *op) {
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LLVM::DIExpressionRewriter rewriter;
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rewriter.addPattern(std::make_unique<MergeFragments>());
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AttrTypeReplacer replacer;
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replacer.addReplacement([&rewriter](LLVM::DIExpressionAttr expr) {
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return rewriter.simplify(expr);
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});
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replacer.recursivelyReplaceElementsIn(op);
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}
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