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//===- FuncToEmitC.cpp - Func to EmitC Patterns -----------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file implements patterns to convert the Func dialect to the EmitC
// dialect.
//
//===----------------------------------------------------------------------===//
#include "mlir/Conversion/FuncToEmitC/FuncToEmitC.h"
#include "mlir/Conversion/ConvertToEmitC/ToEmitCInterface.h"
#include "mlir/Dialect/EmitC/IR/EmitC.h"
#include "mlir/Dialect/Func/IR/FuncOps.h"
#include "mlir/Transforms/DialectConversion.h"
using namespace mlir;
namespace {
/// Implement the interface to convert Func to EmitC.
struct FuncToEmitCDialectInterface : public ConvertToEmitCPatternInterface {
using ConvertToEmitCPatternInterface::ConvertToEmitCPatternInterface;
/// Hook for derived dialect interface to provide conversion patterns
/// and mark dialect legal for the conversion target.
void populateConvertToEmitCConversionPatterns(
ConversionTarget &target, TypeConverter &typeConverter,
RewritePatternSet &patterns) const final {
populateFuncToEmitCPatterns(typeConverter, patterns);
}
};
} // namespace
void mlir::registerConvertFuncToEmitCInterface(DialectRegistry ®istry) {
registry.addExtension(+[](MLIRContext *ctx, func::FuncDialect *dialect) {
dialect->addInterfaces<FuncToEmitCDialectInterface>();
});
}
//===----------------------------------------------------------------------===//
// Conversion Patterns
//===----------------------------------------------------------------------===//
namespace {
class CallOpConversion final : public OpConversionPattern<func::CallOp> {
public:
using OpConversionPattern<func::CallOp>::OpConversionPattern;
LogicalResult
matchAndRewrite(func::CallOp callOp, OpAdaptor adaptor,
ConversionPatternRewriter &rewriter) const override {
// Multiple results func cannot be converted to `emitc.func`.
if (callOp.getNumResults() > 1)
return rewriter.notifyMatchFailure(
callOp, "only functions with zero or one result can be converted");
rewriter.replaceOpWithNewOp<emitc::CallOp>(callOp, callOp.getResultTypes(),
adaptor.getOperands(),
callOp->getAttrs());
return success();
}
};
class FuncOpConversion final : public OpConversionPattern<func::FuncOp> {
public:
using OpConversionPattern<func::FuncOp>::OpConversionPattern;
LogicalResult
matchAndRewrite(func::FuncOp funcOp, OpAdaptor adaptor,
ConversionPatternRewriter &rewriter) const override {
FunctionType fnType = funcOp.getFunctionType();
if (fnType.getNumResults() > 1)
return rewriter.notifyMatchFailure(
funcOp, "only functions with zero or one result can be converted");
TypeConverter::SignatureConversion signatureConverter(
fnType.getNumInputs());
for (const auto &argType : enumerate(fnType.getInputs())) {
auto convertedType = getTypeConverter()->convertType(argType.value());
if (!convertedType)
return rewriter.notifyMatchFailure(funcOp,
"argument type conversion failed");
signatureConverter.addInputs(argType.index(), convertedType);
}
Type resultType;
if (fnType.getNumResults() == 1) {
resultType = getTypeConverter()->convertType(fnType.getResult(0));
if (!resultType)
return rewriter.notifyMatchFailure(funcOp,
"result type conversion failed");
}
// Create the converted `emitc.func` op.
emitc::FuncOp newFuncOp = emitc::FuncOp::create(
rewriter, funcOp.getLoc(), funcOp.getName(),
FunctionType::get(rewriter.getContext(),
signatureConverter.getConvertedTypes(),
resultType ? TypeRange(resultType) : TypeRange()));
// Copy over all attributes other than the function name and type.
for (const auto &namedAttr : funcOp->getAttrs()) {
if (namedAttr.getName() != funcOp.getFunctionTypeAttrName() &&
namedAttr.getName() != SymbolTable::getSymbolAttrName())
newFuncOp->setAttr(namedAttr.getName(), namedAttr.getValue());
}
// Add `extern` to specifiers if `func.func` is declaration only.
if (funcOp.isDeclaration()) {
ArrayAttr specifiers = rewriter.getStrArrayAttr({"extern"});
newFuncOp.setSpecifiersAttr(specifiers);
}
// Add `static` to specifiers if `func.func` is private but not a
// declaration.
if (funcOp.isPrivate() && !funcOp.isDeclaration()) {
ArrayAttr specifiers = rewriter.getStrArrayAttr({"static"});
newFuncOp.setSpecifiersAttr(specifiers);
}
if (!funcOp.isDeclaration()) {
rewriter.inlineRegionBefore(funcOp.getBody(), newFuncOp.getBody(),
newFuncOp.end());
if (failed(rewriter.convertRegionTypes(
&newFuncOp.getBody(), *getTypeConverter(), &signatureConverter)))
return failure();
}
rewriter.eraseOp(funcOp);
return success();
}
};
class ReturnOpConversion final : public OpConversionPattern<func::ReturnOp> {
public:
using OpConversionPattern<func::ReturnOp>::OpConversionPattern;
LogicalResult
matchAndRewrite(func::ReturnOp returnOp, OpAdaptor adaptor,
ConversionPatternRewriter &rewriter) const override {
if (returnOp.getNumOperands() > 1)
return rewriter.notifyMatchFailure(
returnOp, "only zero or one operand is supported");
rewriter.replaceOpWithNewOp<emitc::ReturnOp>(
returnOp,
returnOp.getNumOperands() ? adaptor.getOperands()[0] : nullptr);
return success();
}
};
} // namespace
//===----------------------------------------------------------------------===//
// Pattern population
//===----------------------------------------------------------------------===//
void mlir::populateFuncToEmitCPatterns(const TypeConverter &typeConverter,
RewritePatternSet &patterns) {
MLIRContext *ctx = patterns.getContext();
patterns.add<CallOpConversion, FuncOpConversion, ReturnOpConversion>(
typeConverter, ctx);
}
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