037742cdf2
This is done by providing a walk callback that returns a WalkResult. This result is either `advance` or `interrupt`. `advance` means that the walk should continue, whereas `interrupt` signals that the walk should stop immediately. An example is shown below:
auto result = op->walk([](Operation *op) {
if (some_invariant)
return WalkResult::interrupt();
return WalkResult::advance();
});
if (result.wasInterrupted())
...;
PiperOrigin-RevId: 266436700
52 lines
2.0 KiB
C++
52 lines
2.0 KiB
C++
//===- Visitors.cpp - MLIR Visitor Utilties -------------------------------===//
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//
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// Copyright 2019 The MLIR Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// =============================================================================
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#include "mlir/IR/Visitors.h"
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#include "mlir/IR/Operation.h"
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using namespace mlir;
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/// Walk all of the operations nested under and including the given operations.
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void detail::walkOperations(Operation *op,
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function_ref<void(Operation *op)> callback) {
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// TODO(b/140235992) This walk should be iterative over the operations.
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for (auto ®ion : op->getRegions())
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for (auto &block : region)
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// Early increment here in the case where the operation is erased.
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for (auto &nestedOp : llvm::make_early_inc_range(block))
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walkOperations(&nestedOp, callback);
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callback(op);
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}
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/// Walk all of the operations nested under and including the given operations.
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/// This methods walks operations until an interrupt signal is received.
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WalkResult
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detail::walkOperations(Operation *op,
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function_ref<WalkResult(Operation *op)> callback) {
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// TODO(b/140235992) This walk should be iterative over the operations.
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for (auto ®ion : op->getRegions()) {
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for (auto &block : region) {
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// Early increment here in the case where the operation is erased.
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for (auto &nestedOp : llvm::make_early_inc_range(block))
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if (walkOperations(&nestedOp, callback).wasInterrupted())
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return WalkResult::interrupt();
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}
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}
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return callback(op);
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}
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