#include "llvm/IR/UseListOrder.h"
-#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DenseSet.h"
-#include "llvm/AsmParser/Parser.h"
-#include "llvm/Bitcode/ReaderWriter.h"
-#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
-#include "llvm/Support/FileSystem.h"
-#include "llvm/Support/FileUtilities.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/SourceMgr.h"
#include <random>
#include <vector>
cl::desc("Experimental support to preserve bitcode use-list order."),
cl::init(false), cl::Hidden);
+static cl::opt<bool> PreserveAssemblyUseListOrder(
+ "preserve-ll-use-list-order",
+ cl::desc("Experimental support to preserve assembly use-list order."),
+ cl::init(false), cl::Hidden);
+
bool llvm::shouldPreserveBitcodeUseListOrder() {
return PreserveBitcodeUseListOrder;
}
+bool llvm::shouldPreserveAssemblyUseListOrder() {
+ return PreserveAssemblyUseListOrder;
+}
+
static void shuffleValueUseLists(Value *V, std::minstd_rand0 &Gen,
DenseSet<Value *> &Seen) {
if (!Seen.insert(V).second)
DEBUG(dbgs() << "\n");
}
-
-namespace {
-
-struct TempFile {
- std::string Filename;
- FileRemover Remover;
- bool init(const std::string &Ext);
- bool writeBitcode(const Module &M) const;
- bool writeAssembly(const Module &M) const;
- std::unique_ptr<Module> readBitcode(LLVMContext &Context) const;
- std::unique_ptr<Module> readAssembly(LLVMContext &Context) const;
-};
-
-struct ValueMapping {
- DenseMap<const Value *, unsigned> IDs;
- std::vector<const Value *> Values;
-
- /// \brief Construct a value mapping for module.
- ///
- /// Creates mapping from every value in \c M to an ID. This mapping includes
- /// un-referencable values.
- ///
- /// Every \a Value that gets serialized in some way should be represented
- /// here. The order needs to be deterministic, but it's unnecessary to match
- /// the value-ids in the bitcode writer.
- ///
- /// All constants that are referenced by other values are included in the
- /// mapping, but others -- which wouldn't be serialized -- are not.
- ValueMapping(const Module &M);
-
- /// \brief Map a value.
- ///
- /// Maps a value. If it's a constant, maps all of its operands first.
- void map(const Value *V);
- unsigned lookup(const Value *V) const { return IDs.lookup(V); }
-};
-
-} // end namespace
-
-bool TempFile::init(const std::string &Ext) {
- SmallVector<char, 64> Vector;
- DEBUG(dbgs() << " - create-temp-file\n");
- if (auto EC = sys::fs::createTemporaryFile("use-list-order", Ext, Vector)) {
- (void)EC;
- DEBUG(dbgs() << "error: " << EC.message() << "\n");
- return true;
- }
- assert(!Vector.empty());
-
- Filename.assign(Vector.data(), Vector.data() + Vector.size());
- Remover.setFile(Filename);
- DEBUG(dbgs() << " - filename = " << Filename << "\n");
- return false;
-}
-
-bool TempFile::writeBitcode(const Module &M) const {
- DEBUG(dbgs() << " - write bitcode\n");
- std::string ErrorInfo;
- raw_fd_ostream OS(Filename.c_str(), ErrorInfo, sys::fs::F_None);
- if (!ErrorInfo.empty()) {
- DEBUG(dbgs() << "error: " << ErrorInfo << "\n");
- return true;
- }
-
- WriteBitcodeToFile(&M, OS);
- return false;
-}
-
-bool TempFile::writeAssembly(const Module &M) const {
- DEBUG(dbgs() << " - write assembly\n");
- std::string ErrorInfo;
- raw_fd_ostream OS(Filename.c_str(), ErrorInfo, sys::fs::F_Text);
- if (!ErrorInfo.empty()) {
- DEBUG(dbgs() << "error: " << ErrorInfo << "\n");
- return true;
- }
-
- OS << M;
- return false;
-}
-
-std::unique_ptr<Module> TempFile::readBitcode(LLVMContext &Context) const {
- DEBUG(dbgs() << " - read bitcode\n");
- ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOr =
- MemoryBuffer::getFile(Filename);
- if (!BufferOr) {
- DEBUG(dbgs() << "error: " << BufferOr.getError().message() << "\n");
- return nullptr;
- }
-
- std::unique_ptr<MemoryBuffer> Buffer = std::move(BufferOr.get());
- ErrorOr<Module *> ModuleOr = parseBitcodeFile(Buffer.release(), Context);
- if (!ModuleOr) {
- DEBUG(dbgs() << "error: " << ModuleOr.getError().message() << "\n");
- return nullptr;
- }
- return std::unique_ptr<Module>(ModuleOr.get());
-}
-
-std::unique_ptr<Module> TempFile::readAssembly(LLVMContext &Context) const {
- DEBUG(dbgs() << " - read assembly\n");
- SMDiagnostic Err;
- std::unique_ptr<Module> M(ParseAssemblyFile(Filename, Err, Context));
- if (!M.get())
- DEBUG(dbgs() << "error: "; Err.print("verify-use-list-order", dbgs()));
- return M;
-}
-
-ValueMapping::ValueMapping(const Module &M) {
- // Every value should be mapped, including things like void instructions and
- // basic blocks that are kept out of the ValueEnumerator.
- //
- // The current mapping order makes it easier to debug the tables. It happens
- // to be similar to the ID mapping when writing ValueEnumerator, but they
- // aren't (and needn't be) in sync.
-
- // Globals.
- for (const GlobalVariable &G : M.globals())
- map(&G);
- for (const GlobalAlias &A : M.aliases())
- map(&A);
- for (const Function &F : M)
- map(&F);
-
- // Constants used by globals.
- for (const GlobalVariable &G : M.globals())
- if (G.hasInitializer())
- map(G.getInitializer());
- for (const GlobalAlias &A : M.aliases())
- map(A.getAliasee());
- for (const Function &F : M)
- if (F.hasPrefixData())
- map(F.getPrefixData());
-
- // Function bodies.
- for (const Function &F : M) {
- for (const Argument &A : F.args())
- map(&A);
- for (const BasicBlock &BB : F)
- map(&BB);
- for (const BasicBlock &BB : F)
- for (const Instruction &I : BB)
- map(&I);
-
- // Constants used by instructions.
- for (const BasicBlock &BB : F)
- for (const Instruction &I : BB)
- for (const Value *Op : I.operands())
- if ((isa<Constant>(Op) && !isa<GlobalValue>(*Op)) ||
- isa<InlineAsm>(Op))
- map(Op);
- }
-}
-
-void ValueMapping::map(const Value *V) {
- if (IDs.lookup(V))
- return;
-
- if (auto *C = dyn_cast<Constant>(V))
- if (!isa<GlobalValue>(C))
- for (const Value *Op : C->operands())
- map(Op);
-
- Values.push_back(V);
- IDs[V] = Values.size();
-}
-
-#ifndef NDEBUG
-static void dumpMapping(const ValueMapping &VM) {
- dbgs() << "value-mapping (size = " << VM.Values.size() << "):\n";
- for (unsigned I = 0, E = VM.Values.size(); I != E; ++I) {
- dbgs() << " - id = " << I << ", value = ";
- VM.Values[I]->dump();
- }
-}
-
-static void debugValue(const ValueMapping &M, unsigned I, StringRef Desc) {
- const Value *V = M.Values[I];
- dbgs() << " - " << Desc << " value = ";
- V->dump();
- for (const Use &U : V->uses()) {
- dbgs() << " => use: op = " << U.getOperandNo()
- << ", user-id = " << M.IDs.lookup(U.getUser()) << ", user = ";
- U.getUser()->dump();
- }
-}
-
-static void debugUserMismatch(const ValueMapping &L, const ValueMapping &R,
- unsigned I) {
- dbgs() << " - fail: user mismatch: ID = " << I << "\n";
- debugValue(L, I, "LHS");
- debugValue(R, I, "RHS");
-
- dbgs() << "\nlhs-";
- dumpMapping(L);
- dbgs() << "\nrhs-";
- dumpMapping(R);
-}
-
-static void debugSizeMismatch(const ValueMapping &L, const ValueMapping &R) {
- dbgs() << " - fail: map size: " << L.Values.size()
- << " != " << R.Values.size() << "\n";
- dbgs() << "\nlhs-";
- dumpMapping(L);
- dbgs() << "\nrhs-";
- dumpMapping(R);
-}
-#endif
-
-static bool matches(const ValueMapping &LM, const ValueMapping &RM) {
- DEBUG(dbgs() << "compare value maps\n");
- if (LM.Values.size() != RM.Values.size()) {
- DEBUG(debugSizeMismatch(LM, RM));
- return false;
- }
-
- // This mapping doesn't include dangling constant users, since those don't
- // get serialized. However, checking if users are constant and calling
- // isConstantUsed() on every one is very expensive. Instead, just check if
- // the user is mapped.
- auto skipUnmappedUsers =
- [&](Value::const_use_iterator &U, Value::const_use_iterator E,
- const ValueMapping &M) {
- while (U != E && !M.lookup(U->getUser()))
- ++U;
- };
-
- // Iterate through all values, and check that both mappings have the same
- // users.
- for (unsigned I = 0, E = LM.Values.size(); I != E; ++I) {
- const Value *L = LM.Values[I];
- const Value *R = RM.Values[I];
- auto LU = L->use_begin(), LE = L->use_end();
- auto RU = R->use_begin(), RE = R->use_end();
- skipUnmappedUsers(LU, LE, LM);
- skipUnmappedUsers(RU, RE, RM);
-
- while (LU != LE) {
- if (RU == RE) {
- DEBUG(debugUserMismatch(LM, RM, I));
- return false;
- }
- if (LM.lookup(LU->getUser()) != RM.lookup(RU->getUser())) {
- DEBUG(debugUserMismatch(LM, RM, I));
- return false;
- }
- if (LU->getOperandNo() != RU->getOperandNo()) {
- DEBUG(debugUserMismatch(LM, RM, I));
- return false;
- }
- skipUnmappedUsers(++LU, LE, LM);
- skipUnmappedUsers(++RU, RE, RM);
- }
- if (RU != RE) {
- DEBUG(debugUserMismatch(LM, RM, I));
- return false;
- }
- }
-
- return true;
-}
-
-bool llvm::verifyBitcodeUseListOrder(const Module &M) {
- DEBUG(dbgs() << "*** verify-use-list-order: bitcode ***\n");
- TempFile F;
- if (F.init("bc"))
- return false;
-
- if (F.writeBitcode(M))
- return false;
-
- LLVMContext Context;
- std::unique_ptr<Module> OtherM = F.readBitcode(Context);
- if (!OtherM)
- return false;
-
- return matches(ValueMapping(M), ValueMapping(*OtherM));
-}
-
-bool llvm::verifyAssemblyUseListOrder(const Module &M) {
- DEBUG(dbgs() << "*** verify-use-list-order: assembly ***\n");
- TempFile F;
- if (F.init("ll"))
- return false;
-
- if (F.writeAssembly(M))
- return false;
-
- LLVMContext Context;
- std::unique_ptr<Module> OtherM = F.readAssembly(Context);
- if (!OtherM)
- return false;
-
- return matches(ValueMapping(M), ValueMapping(*OtherM));
-}
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