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//===- FuncConversions.cpp - Function conversions -------------------------===//
//
// 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/Func/Transforms/FuncConversions.h"
#include "mlir/Dialect/Func/IR/FuncOps.h"
#include "mlir/Transforms/DialectConversion.h"
using namespace mlir;
using namespace mlir::func;
namespace {
/// Converts the operand and result types of the CallOp, used together with the
/// FuncOpSignatureConversion.
struct CallOpSignatureConversion : public OpConversionPattern<CallOp> {
using OpConversionPattern<CallOp>::OpConversionPattern;
/// Hook for derived classes to implement combined matching and rewriting.
LogicalResult
matchAndRewrite(CallOp callOp, OpAdaptor adaptor,
ConversionPatternRewriter &rewriter) const override {
// Convert the original function results.
SmallVector<Type, 1> convertedResults;
if (failed(typeConverter->convertTypes(callOp.getResultTypes(),
convertedResults)))
return failure();
// If this isn't a one-to-one type mapping, we don't know how to aggregate
// the results.
if (callOp->getNumResults() != convertedResults.size())
return failure();
// Substitute with the new result types from the corresponding FuncType
// conversion.
rewriter.replaceOpWithNewOp<CallOp>(
callOp, callOp.getCallee(), convertedResults, adaptor.getOperands());
return success();
}
};
} // namespace
void mlir::populateCallOpTypeConversionPattern(RewritePatternSet &patterns,
TypeConverter &converter) {
patterns.add<CallOpSignatureConversion>(converter, patterns.getContext());
}
namespace {
/// Only needed to support partial conversion of functions where this pattern
/// ensures that the branch operation arguments matches up with the succesor
/// block arguments.
class BranchOpInterfaceTypeConversion
: public OpInterfaceConversionPattern<BranchOpInterface> {
public:
using OpInterfaceConversionPattern<
BranchOpInterface>::OpInterfaceConversionPattern;
BranchOpInterfaceTypeConversion(
TypeConverter &typeConverter, MLIRContext *ctx,
function_ref<bool(BranchOpInterface, int)> shouldConvertBranchOperand)
: OpInterfaceConversionPattern(typeConverter, ctx, /*benefit=*/1),
shouldConvertBranchOperand(shouldConvertBranchOperand) {}
LogicalResult
matchAndRewrite(BranchOpInterface op, ArrayRef<Value> operands,
ConversionPatternRewriter &rewriter) const final {
// For a branch operation, only some operands go to the target blocks, so
// only rewrite those.
SmallVector<Value, 4> newOperands(op->operand_begin(), op->operand_end());
for (int succIdx = 0, succEnd = op->getBlock()->getNumSuccessors();
succIdx < succEnd; ++succIdx) {
OperandRange forwardedOperands =
op.getSuccessorOperands(succIdx).getForwardedOperands();
if (forwardedOperands.empty())
continue;
for (int idx = forwardedOperands.getBeginOperandIndex(),
eidx = idx + forwardedOperands.size();
idx < eidx; ++idx) {
if (!shouldConvertBranchOperand || shouldConvertBranchOperand(op, idx))
newOperands[idx] = operands[idx];
}
}
rewriter.updateRootInPlace(
op, [newOperands, op]() { op->setOperands(newOperands); });
return success();
}
private:
function_ref<bool(BranchOpInterface, int)> shouldConvertBranchOperand;
};
} // namespace
namespace {
/// Only needed to support partial conversion of functions where this pattern
/// ensures that the branch operation arguments matches up with the succesor
/// block arguments.
class ReturnOpTypeConversion : public OpConversionPattern<ReturnOp> {
public:
using OpConversionPattern<ReturnOp>::OpConversionPattern;
LogicalResult
matchAndRewrite(ReturnOp op, OpAdaptor adaptor,
ConversionPatternRewriter &rewriter) const final {
// For a return, all operands go to the results of the parent, so
// rewrite them all.
rewriter.updateRootInPlace(op,
[&] { op->setOperands(adaptor.getOperands()); });
return success();
}
};
} // namespace
void mlir::populateBranchOpInterfaceTypeConversionPattern(
RewritePatternSet &patterns, TypeConverter &typeConverter,
function_ref<bool(BranchOpInterface, int)> shouldConvertBranchOperand) {
patterns.add<BranchOpInterfaceTypeConversion>(
typeConverter, patterns.getContext(), shouldConvertBranchOperand);
}
bool mlir::isLegalForBranchOpInterfaceTypeConversionPattern(
Operation *op, TypeConverter &converter) {
// All successor operands of branch like operations must be rewritten.
if (auto branchOp = dyn_cast<BranchOpInterface>(op)) {
for (int p = 0, e = op->getBlock()->getNumSuccessors(); p < e; ++p) {
auto successorOperands = branchOp.getSuccessorOperands(p);
if (!converter.isLegal(
successorOperands.getForwardedOperands().getTypes()))
return false;
}
return true;
}
return false;
}
void mlir::populateReturnOpTypeConversionPattern(RewritePatternSet &patterns,
TypeConverter &typeConverter) {
patterns.add<ReturnOpTypeConversion>(typeConverter, patterns.getContext());
}
bool mlir::isLegalForReturnOpTypeConversionPattern(Operation *op,
TypeConverter &converter,
bool returnOpAlwaysLegal) {
// If this is a `return` and the user pass wants to convert/transform across
// function boundaries, then `converter` is invoked to check whether the the
// `return` op is legal.
if (isa<ReturnOp>(op) && !returnOpAlwaysLegal)
return converter.isLegal(op);
// ReturnLike operations have to be legalized with their parent. For
// return this is handled, for other ops they remain as is.
return op->hasTrait<OpTrait::ReturnLike>();
}
bool mlir::isNotBranchOpInterfaceOrReturnLikeOp(Operation *op) {
// If it is not a terminator, ignore it.
if (!op->mightHaveTrait<OpTrait::IsTerminator>())
return true;
// If it is not the last operation in the block, also ignore it. We do
// this to handle unknown operations, as well.
Block *block = op->getBlock();
if (!block || &block->back() != op)
return true;
// We don't want to handle terminators in nested regions, assume they are
// always legal.
if (!isa_and_nonnull<FuncOp>(op->getParentOp()))
return true;
return false;
}
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