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//===- DIExpressionLegalization.cpp - DIExpression Legalization Patterns --===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "mlir/Dialect/LLVMIR/Transforms/DIExpressionLegalization.h"
#include "llvm/BinaryFormat/Dwarf.h"
using namespace mlir;
using namespace LLVM;
//===----------------------------------------------------------------------===//
// MergeFragments
//===----------------------------------------------------------------------===//
MergeFragments::OpIterT MergeFragments::match(OpIterRange operators) const {
OpIterT it = operators.begin();
if (it == operators.end() ||
it->getOpcode() != llvm::dwarf::DW_OP_LLVM_fragment)
return operators.begin();
++it;
if (it == operators.end() ||
it->getOpcode() != llvm::dwarf::DW_OP_LLVM_fragment)
return operators.begin();
return ++it;
}
SmallVector<MergeFragments::OperatorT>
MergeFragments::replace(OpIterRange operators) const {
OpIterT it = operators.begin();
OperatorT first = *(it++);
OperatorT second = *it;
// Add offsets & select the size of the earlier operator (the one closer to
// the IR value).
uint64_t offset = first.getArguments()[0] + second.getArguments()[0];
uint64_t size = first.getArguments()[1];
OperatorT newOp = OperatorT::get(
first.getContext(), llvm::dwarf::DW_OP_LLVM_fragment, {offset, size});
return SmallVector<OperatorT>{newOp};
}
//===----------------------------------------------------------------------===//
// Runner
//===----------------------------------------------------------------------===//
void mlir::LLVM::legalizeDIExpressionsRecursively(Operation *op) {
LLVM::DIExpressionRewriter rewriter;
rewriter.addPattern(std::make_unique<MergeFragments>());
AttrTypeReplacer replacer;
replacer.addReplacement([&rewriter](LLVM::DIExpressionAttr expr) {
return rewriter.simplify(expr);
});
replacer.recursivelyReplaceElementsIn(op);
}
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