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[msan] Initialize callbacks in runOnFunction as opposed to doInitialization.
This mirrors the change in ASan & TSan done in r168864. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169378 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -129,13 +129,15 @@ namespace {
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/// uninitialized reads.
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class MemorySanitizer : public FunctionPass {
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public:
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MemorySanitizer() : FunctionPass(ID), TD(0) { }
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MemorySanitizer() : FunctionPass(ID), TD(0), WarningFn(0) { }
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const char *getPassName() const { return "MemorySanitizer"; }
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bool runOnFunction(Function &F);
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bool doInitialization(Module &M);
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static char ID; // Pass identification, replacement for typeid.
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private:
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void initializeCallbacks(Module &M);
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DataLayout *TD;
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LLVMContext *C;
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Type *IntptrTy;
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@ -209,44 +211,14 @@ static GlobalVariable *createPrivateNonConstGlobalForString(Module &M,
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GlobalValue::PrivateLinkage, StrConst, "");
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}
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/// \brief Module-level initialization.
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///
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/// Obtains pointers to the required runtime library functions, and
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/// inserts a call to __msan_init to the module's constructor list.
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bool MemorySanitizer::doInitialization(Module &M) {
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TD = getAnalysisIfAvailable<DataLayout>();
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if (!TD)
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return false;
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BL.reset(new BlackList(ClBlackListFile));
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C = &(M.getContext());
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unsigned PtrSize = TD->getPointerSizeInBits(/* AddressSpace */0);
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switch (PtrSize) {
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case 64:
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ShadowMask = kShadowMask64;
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OriginOffset = kOriginOffset64;
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break;
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case 32:
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ShadowMask = kShadowMask32;
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OriginOffset = kOriginOffset32;
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break;
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default:
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report_fatal_error("unsupported pointer size");
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break;
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}
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/// \brief Insert extern declaration of runtime-provided functions and globals.
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void MemorySanitizer::initializeCallbacks(Module &M) {
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// Only do this once.
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if (WarningFn)
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return;
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IRBuilder<> IRB(*C);
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IntptrTy = IRB.getIntPtrTy(TD);
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OriginTy = IRB.getInt32Ty();
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ColdCallWeights = MDBuilder(*C).createBranchWeights(1, 1000);
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// Insert a call to __msan_init/__msan_track_origins into the module's CTORs.
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appendToGlobalCtors(M, cast<Function>(M.getOrInsertFunction(
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"__msan_init", IRB.getVoidTy(), NULL)), 0);
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new GlobalVariable(M, IRB.getInt32Ty(), true, GlobalValue::WeakODRLinkage,
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IRB.getInt32(ClTrackOrigins), "__msan_track_origins");
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// Create the callback.
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// FIXME: this function should have "Cold" calling conv,
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// which is not yet implemented.
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@ -305,6 +277,45 @@ bool MemorySanitizer::doInitialization(Module &M) {
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EmptyAsm = InlineAsm::get(FunctionType::get(IRB.getVoidTy(), false),
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StringRef(""), StringRef(""),
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/*hasSideEffects=*/true);
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}
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/// \brief Module-level initialization.
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///
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/// inserts a call to __msan_init to the module's constructor list.
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bool MemorySanitizer::doInitialization(Module &M) {
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TD = getAnalysisIfAvailable<DataLayout>();
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if (!TD)
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return false;
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BL.reset(new BlackList(ClBlackListFile));
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C = &(M.getContext());
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unsigned PtrSize = TD->getPointerSizeInBits(/* AddressSpace */0);
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switch (PtrSize) {
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case 64:
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ShadowMask = kShadowMask64;
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OriginOffset = kOriginOffset64;
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break;
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case 32:
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ShadowMask = kShadowMask32;
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OriginOffset = kOriginOffset32;
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break;
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default:
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report_fatal_error("unsupported pointer size");
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break;
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}
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IRBuilder<> IRB(*C);
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IntptrTy = IRB.getIntPtrTy(TD);
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OriginTy = IRB.getInt32Ty();
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ColdCallWeights = MDBuilder(*C).createBranchWeights(1, 1000);
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// Insert a call to __msan_init/__msan_track_origins into the module's CTORs.
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appendToGlobalCtors(M, cast<Function>(M.getOrInsertFunction(
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"__msan_init", IRB.getVoidTy(), NULL)), 0);
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new GlobalVariable(M, IRB.getInt32Ty(), true, GlobalValue::WeakODRLinkage,
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IRB.getInt32(ClTrackOrigins), "__msan_track_origins");
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return true;
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}
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@ -411,6 +422,7 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
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/// \brief Add MemorySanitizer instrumentation to a function.
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bool runOnFunction() {
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MS.initializeCallbacks(*F.getParent());
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if (!MS.TD) return false;
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// Iterate all BBs in depth-first order and create shadow instructions
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// for all instructions (where applicable).
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