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//===- TestDominance.cpp - Test dominance construction and information
//-------===//
//
// 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 contains test passes for constructing and resolving dominance
// information.
//
//===----------------------------------------------------------------------===//
#include "mlir/IR/Builders.h"
#include "mlir/IR/Dominance.h"
#include "mlir/IR/SymbolTable.h"
#include "mlir/Pass/Pass.h"
using namespace mlir;
/// Overloaded helper to call the right function based on whether we are testing
/// dominance or post-dominance.
static bool dominatesOrPostDominates(DominanceInfo &dominanceInfo, Block *a,
Block *b) {
return dominanceInfo.dominates(a, b);
}
static bool dominatesOrPostDominates(PostDominanceInfo &dominanceInfo, Block *a,
Block *b) {
return dominanceInfo.postDominates(a, b);
}
static bool properlyDominatesOrPostDominates(DominanceInfo &dominanceInfo,
Block *a, Block *b) {
return dominanceInfo.properlyDominates(a, b);
}
static bool properlyDominatesOrPostDominates(PostDominanceInfo &dominanceInfo,
Block *a, Block *b) {
return dominanceInfo.properlyPostDominates(a, b);
}
namespace {
/// Helper class to print dominance information.
class DominanceTest {
public:
static constexpr StringRef kBlockIdsAttrName = "test.block_ids";
/// Constructs a new test instance using the given operation.
DominanceTest(Operation *operation) : operation(operation) {
Builder b(operation->getContext());
// Helper function that annotates the IR with block IDs.
auto annotateBlockId = [&](Operation *op, int64_t blockId) {
auto idAttr = op->getAttrOfType<DenseI64ArrayAttr>(kBlockIdsAttrName);
SmallVector<int64_t> ids;
if (idAttr)
ids = llvm::to_vector(idAttr.asArrayRef());
ids.push_back(blockId);
op->setAttr(kBlockIdsAttrName, b.getDenseI64ArrayAttr(ids));
};
// Create unique IDs for each block.
operation->walk([&](Operation *nested) {
if (blockIds.count(nested->getBlock()) > 0)
return;
blockIds.insert({nested->getBlock(), blockIds.size()});
annotateBlockId(nested->getBlock()->getParentOp(), blockIds.size() - 1);
});
}
/// Prints dominance information of all blocks.
template <typename DominanceT>
void printDominance(DominanceT &dominanceInfo,
bool printCommonDominatorInfo) {
DenseSet<Block *> parentVisited;
operation->walk([&](Operation *op) {
Block *block = op->getBlock();
if (!parentVisited.insert(block).second)
return;
DenseSet<Block *> visited;
operation->walk([&](Operation *nested) {
Block *nestedBlock = nested->getBlock();
if (!visited.insert(nestedBlock).second)
return;
if (printCommonDominatorInfo) {
llvm::outs() << "Nearest(" << blockIds[block] << ", "
<< blockIds[nestedBlock] << ") = ";
Block *dom =
dominanceInfo.findNearestCommonDominator(block, nestedBlock);
if (dom)
llvm::outs() << blockIds[dom];
else
llvm::outs() << "<no dom>";
llvm::outs() << "\n";
} else {
if (std::is_same<DominanceInfo, DominanceT>::value)
llvm::outs() << "dominates(";
else
llvm::outs() << "postdominates(";
llvm::outs() << blockIds[block] << ", " << blockIds[nestedBlock]
<< ") = "
<< std::to_string(dominatesOrPostDominates(
dominanceInfo, block, nestedBlock))
<< " (properly = "
<< std::to_string(properlyDominatesOrPostDominates(
dominanceInfo, block, nestedBlock))
<< ")\n";
}
});
});
}
private:
Operation *operation;
DenseMap<Block *, size_t> blockIds;
};
struct TestDominancePass
: public PassWrapper<TestDominancePass, InterfacePass<SymbolOpInterface>> {
MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(TestDominancePass)
StringRef getArgument() const final { return "test-print-dominance"; }
StringRef getDescription() const final {
return "Print the dominance information for multiple regions.";
}
void runOnOperation() override {
llvm::outs() << "Testing : " << getOperation().getName() << "\n";
DominanceTest dominanceTest(getOperation());
// Print dominance information.
llvm::outs() << "--- DominanceInfo ---\n";
dominanceTest.printDominance(getAnalysis<DominanceInfo>(),
/*printCommonDominatorInfo=*/true);
llvm::outs() << "--- PostDominanceInfo ---\n";
dominanceTest.printDominance(getAnalysis<PostDominanceInfo>(),
/*printCommonDominatorInfo=*/true);
// Print dominance relationship between blocks.
llvm::outs() << "--- Block Dominance relationship ---\n";
dominanceTest.printDominance(getAnalysis<DominanceInfo>(),
/*printCommonDominatorInfo=*/false);
llvm::outs() << "--- Block PostDominance relationship ---\n";
dominanceTest.printDominance(getAnalysis<PostDominanceInfo>(),
/*printCommonDominatorInfo=*/false);
}
};
} // namespace
namespace mlir {
namespace test {
void registerTestDominancePass() { PassRegistration<TestDominancePass>(); }
} // namespace test
} // namespace mlir
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