| 1 | //===- TestPrintDefUse.cpp - Passes to illustrate the IR def-use chains ---===// |
|---|---|
| 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/IR/BuiltinOps.h" |
| 10 | #include "mlir/Pass/Pass.h" |
| 11 | |
| 12 | using namespace mlir; |
| 13 | |
| 14 | namespace { |
| 15 | /// This pass illustrates the IR def-use chains through printing. |
| 16 | struct TestPrintDefUsePass |
| 17 | : public PassWrapper<TestPrintDefUsePass, OperationPass<>> { |
| 18 | MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(TestPrintDefUsePass) |
| 19 | |
| 20 | StringRef getArgument() const final { return "test-print-defuse"; } |
| 21 | StringRef getDescription() const final { return "Test various printing."; } |
| 22 | void runOnOperation() override { |
| 23 | // Recursively traverse the IR nested under the current operation and print |
| 24 | // every single operation and their operands and users. |
| 25 | getOperation()->walk(callback: [](Operation *op) { |
| 26 | llvm::outs() << "Visiting op '"<< op->getName() << "' with " |
| 27 | << op->getNumOperands() << " operands:\n"; |
| 28 | |
| 29 | // Print information about the producer of each of the operands. |
| 30 | for (Value operand : op->getOperands()) { |
| 31 | if (Operation *producer = operand.getDefiningOp()) { |
| 32 | llvm::outs() << " - Operand produced by operation '" |
| 33 | << producer->getName() << "'\n"; |
| 34 | } else { |
| 35 | // If there is no defining op, the Value is necessarily a Block |
| 36 | // argument. |
| 37 | auto blockArg = cast<BlockArgument>(Val&: operand); |
| 38 | llvm::outs() << " - Operand produced by Block argument, number " |
| 39 | << blockArg.getArgNumber() << "\n"; |
| 40 | } |
| 41 | } |
| 42 | |
| 43 | // Print information about the user of each of the result. |
| 44 | llvm::outs() << "Has "<< op->getNumResults() << " results:\n"; |
| 45 | for (const auto &indexedResult : llvm::enumerate(First: op->getResults())) { |
| 46 | Value result = indexedResult.value(); |
| 47 | llvm::outs() << " - Result "<< indexedResult.index(); |
| 48 | if (result.use_empty()) { |
| 49 | llvm::outs() << " has no uses\n"; |
| 50 | continue; |
| 51 | } |
| 52 | if (result.hasOneUse()) { |
| 53 | llvm::outs() << " has a single use: "; |
| 54 | } else { |
| 55 | llvm::outs() << " has " |
| 56 | << std::distance(first: result.getUses().begin(), |
| 57 | last: result.getUses().end()) |
| 58 | << " uses:\n"; |
| 59 | } |
| 60 | for (Operation *userOp : result.getUsers()) { |
| 61 | llvm::outs() << " - "<< userOp->getName() << "\n"; |
| 62 | } |
| 63 | } |
| 64 | }); |
| 65 | } |
| 66 | }; |
| 67 | } // namespace |
| 68 | |
| 69 | namespace mlir { |
| 70 | void registerTestPrintDefUsePass() { PassRegistration<TestPrintDefUsePass>(); } |
| 71 | } // namespace mlir |
| 72 |