85 lines
2.0 KiB
C++
85 lines
2.0 KiB
C++
//===-- StructuralHash.cpp - IR Hash for expensive checks -------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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#ifdef EXPENSIVE_CHECKS
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#include "llvm/IR/StructuralHash.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/Module.h"
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using namespace llvm;
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namespace {
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namespace details {
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// Basic hashing mechanism to detect structural change to the IR, used to verify
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// pass return status consistency with actual change. Loosely copied from
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// llvm/lib/Transforms/Utils/FunctionComparator.cpp
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class StructuralHash {
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uint64_t Hash = 0x6acaa36bef8325c5ULL;
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void update(uint64_t V) { Hash = hashing::detail::hash_16_bytes(Hash, V); }
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public:
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StructuralHash() = default;
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void update(const Function &F) {
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if (F.empty())
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return;
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update(F.isVarArg());
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update(F.arg_size());
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SmallVector<const BasicBlock *, 8> BBs;
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SmallPtrSet<const BasicBlock *, 16> VisitedBBs;
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BBs.push_back(&F.getEntryBlock());
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VisitedBBs.insert(BBs[0]);
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while (!BBs.empty()) {
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const BasicBlock *BB = BBs.pop_back_val();
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update(45798); // Block header
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for (auto &Inst : *BB)
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update(Inst.getOpcode());
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const Instruction *Term = BB->getTerminator();
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for (unsigned i = 0, e = Term->getNumSuccessors(); i != e; ++i) {
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if (!VisitedBBs.insert(Term->getSuccessor(i)).second)
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continue;
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BBs.push_back(Term->getSuccessor(i));
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}
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}
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}
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void update(const Module &M) {
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for (const Function &F : M)
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update(F);
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}
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uint64_t getHash() const { return Hash; }
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};
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} // namespace details
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} // namespace
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uint64_t llvm::StructuralHash(const Function &F) {
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details::StructuralHash H;
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H.update(F);
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return H.getHash();
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}
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uint64_t llvm::StructuralHash(const Module &M) {
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details::StructuralHash H;
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H.update(M);
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return H.getHash();
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}
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#endif
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