| 1 | //===- InferEffects.cpp - Infer memory effects for named symbols ----------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #include "mlir/Dialect/Transform/IR/TransformDialect.h" |
| 10 | #include "mlir/Dialect/Transform/Transforms/Passes.h" |
| 11 | |
| 12 | #include "mlir/Dialect/Transform/Interfaces/TransformInterfaces.h" |
| 13 | #include "mlir/IR/Visitors.h" |
| 14 | #include "mlir/Interfaces/FunctionInterfaces.h" |
| 15 | #include "mlir/Interfaces/SideEffectInterfaces.h" |
| 16 | #include "llvm/ADT/DenseSet.h" |
| 17 | |
| 18 | using namespace mlir; |
| 19 | |
| 20 | namespace mlir { |
| 21 | namespace transform { |
| 22 | #define GEN_PASS_DEF_INFEREFFECTSPASS |
| 23 | #include "mlir/Dialect/Transform/Transforms/Passes.h.inc" |
| 24 | } // namespace transform |
| 25 | } // namespace mlir |
| 26 | |
| 27 | static LogicalResult inferSideEffectAnnotations(Operation *op) { |
| 28 | if (!isa<transform::TransformOpInterface>(op)) |
| 29 | return success(); |
| 30 | |
| 31 | auto func = dyn_cast<FunctionOpInterface>(op); |
| 32 | if (!func || func.isExternal()) |
| 33 | return success(); |
| 34 | |
| 35 | if (!func.getFunctionBody().hasOneBlock()) { |
| 36 | return op->emitError() |
| 37 | << "only single-block operations are currently supported"; |
| 38 | } |
| 39 | |
| 40 | // Note that there can't be an inclusion of an unannotated symbol because it |
| 41 | // wouldn't have passed the verifier, so recursion isn't necessary here. |
| 42 | llvm::SmallDenseSet<unsigned> consumedArguments; |
| 43 | transform::getConsumedBlockArguments(block&: func.getFunctionBody().front(), |
| 44 | consumedArguments&: consumedArguments); |
| 45 | |
| 46 | for (unsigned i = 0, e = func.getNumArguments(); i < e; ++i) { |
| 47 | func.setArgAttr(i, |
| 48 | consumedArguments.contains(i) |
| 49 | ? transform::TransformDialect::kArgConsumedAttrName |
| 50 | : transform::TransformDialect::kArgReadOnlyAttrName, |
| 51 | UnitAttr::get(op->getContext())); |
| 52 | } |
| 53 | return success(); |
| 54 | } |
| 55 | |
| 56 | namespace { |
| 57 | class InferEffectsPass |
| 58 | : public transform::impl::InferEffectsPassBase<InferEffectsPass> { |
| 59 | public: |
| 60 | void runOnOperation() override { |
| 61 | WalkResult result = getOperation()->walk([](Operation *op) { |
| 62 | return failed(result: inferSideEffectAnnotations(op)) ? WalkResult::interrupt() |
| 63 | : WalkResult::advance(); |
| 64 | }); |
| 65 | if (result.wasInterrupted()) |
| 66 | return signalPassFailure(); |
| 67 | } |
| 68 | }; |
| 69 | } // namespace |
| 70 |