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//===- InferEffects.cpp - Infer memory effects for named symbols ----------===//
//
// 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/Transform/IR/TransformDialect.h"
#include "mlir/Dialect/Transform/Transforms/Passes.h"
#include "mlir/Dialect/Transform/IR/TransformInterfaces.h"
#include "mlir/IR/FunctionInterfaces.h"
#include "mlir/IR/Visitors.h"
#include "mlir/Interfaces/SideEffectInterfaces.h"
#include "llvm/ADT/DenseSet.h"
using namespace mlir;
namespace mlir {
namespace transform {
#define GEN_PASS_DEF_INFEREFFECTSPASS
#include "mlir/Dialect/Transform/Transforms/Passes.h.inc"
} // namespace transform
} // namespace mlir
static LogicalResult inferSideEffectAnnotations(Operation *op) {
if (!isa<transform::TransformOpInterface>(op))
return success();
auto func = dyn_cast<FunctionOpInterface>(op);
if (!func || func.isExternal())
return success();
if (!func.getFunctionBody().hasOneBlock()) {
return op->emitError()
<< "only single-block operations are currently supported";
}
// Note that there can't be an inclusion of an unannotated symbol because it
// wouldn't have passed the verifier, so recursion isn't necessary here.
llvm::SmallDenseSet<unsigned> consumedArguments;
transform::getConsumedBlockArguments(func.getFunctionBody().front(),
consumedArguments);
for (unsigned i = 0, e = func.getNumArguments(); i < e; ++i) {
func.setArgAttr(i,
consumedArguments.contains(i)
? transform::TransformDialect::kArgConsumedAttrName
: transform::TransformDialect::kArgReadOnlyAttrName,
UnitAttr::get(op->getContext()));
}
return success();
}
namespace {
class InferEffectsPass
: public transform::impl::InferEffectsPassBase<InferEffectsPass> {
public:
void runOnOperation() override {
WalkResult result = getOperation()->walk([](Operation *op) {
return failed(inferSideEffectAnnotations(op)) ? WalkResult::interrupt()
: WalkResult::advance();
});
if (result.wasInterrupted())
return signalPassFailure();
}
};
} // namespace
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