mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 12:12:47 +01:00
a12b4db565
This generalizes the logic introduced in https://reviews.llvm.org/D80916 to other passes. It's needed by https://reviews.llvm.org/D86442 to assert passes correctly report their status. Differential Revision: https://reviews.llvm.org/D86589
85 lines
2.0 KiB
C++
85 lines
2.0 KiB
C++
//===-- StructuralHash.cpp - IR Hash for expensive checks -------*- C++ -*-===//
|
|
//
|
|
// 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
|
|
#ifdef EXPENSIVE_CHECKS
|
|
|
|
#include "llvm/IR/StructuralHash.h"
|
|
#include "llvm/IR/Function.h"
|
|
#include "llvm/IR/Module.h"
|
|
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
namespace details {
|
|
|
|
// Basic hashing mechanism to detect structural change to the IR, used to verify
|
|
// pass return status consistency with actual change. Loosely copied from
|
|
// llvm/lib/Transforms/Utils/FunctionComparator.cpp
|
|
|
|
class StructuralHash {
|
|
uint64_t Hash = 0x6acaa36bef8325c5ULL;
|
|
|
|
void update(uint64_t V) { Hash = hashing::detail::hash_16_bytes(Hash, V); }
|
|
|
|
public:
|
|
StructuralHash() = default;
|
|
|
|
void update(const Function &F) {
|
|
if (F.empty())
|
|
return;
|
|
|
|
update(F.isVarArg());
|
|
update(F.arg_size());
|
|
|
|
SmallVector<const BasicBlock *, 8> BBs;
|
|
SmallPtrSet<const BasicBlock *, 16> VisitedBBs;
|
|
|
|
BBs.push_back(&F.getEntryBlock());
|
|
VisitedBBs.insert(BBs[0]);
|
|
while (!BBs.empty()) {
|
|
const BasicBlock *BB = BBs.pop_back_val();
|
|
update(45798); // Block header
|
|
for (auto &Inst : *BB)
|
|
update(Inst.getOpcode());
|
|
|
|
const Instruction *Term = BB->getTerminator();
|
|
for (unsigned i = 0, e = Term->getNumSuccessors(); i != e; ++i) {
|
|
if (!VisitedBBs.insert(Term->getSuccessor(i)).second)
|
|
continue;
|
|
BBs.push_back(Term->getSuccessor(i));
|
|
}
|
|
}
|
|
}
|
|
|
|
void update(const Module &M) {
|
|
for (const Function &F : M)
|
|
update(F);
|
|
}
|
|
|
|
uint64_t getHash() const { return Hash; }
|
|
};
|
|
|
|
} // namespace details
|
|
|
|
} // namespace
|
|
|
|
uint64_t llvm::StructuralHash(const Function &F) {
|
|
details::StructuralHash H;
|
|
H.update(F);
|
|
return H.getHash();
|
|
}
|
|
|
|
uint64_t llvm::StructuralHash(const Module &M) {
|
|
details::StructuralHash H;
|
|
H.update(M);
|
|
return H.getHash();
|
|
}
|
|
|
|
#endif
|