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TSan: Use createSanitizerCtor
to create ctor, and call __tsan_init
Reviewers: kcc, dvyukov Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D8779 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236778 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -72,6 +72,9 @@ STATISTIC(NumOmittedReadsFromConstantGlobals,
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STATISTIC(NumOmittedReadsFromVtable, "Number of vtable reads");
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STATISTIC(NumOmittedNonCaptured, "Number of accesses ignored due to capturing");
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static const char *const kTsanModuleCtorName = "tsan.module_ctor";
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static const char *const kTsanInitName = "__tsan_init";
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namespace {
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/// ThreadSanitizer: instrument the code in module to find races.
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@ -113,6 +116,7 @@ struct ThreadSanitizer : public FunctionPass {
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Function *TsanVptrUpdate;
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Function *TsanVptrLoad;
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Function *MemmoveFn, *MemcpyFn, *MemsetFn;
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Function *TsanCtorFunction;
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};
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} // namespace
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@ -225,13 +229,12 @@ void ThreadSanitizer::initializeCallbacks(Module &M) {
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bool ThreadSanitizer::doInitialization(Module &M) {
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const DataLayout &DL = M.getDataLayout();
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IntptrTy = DL.getIntPtrType(M.getContext());
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std::tie(TsanCtorFunction, std::ignore) = createSanitizerCtorAndInitFunctions(
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M, kTsanModuleCtorName, kTsanInitName, /*InitArgTypes=*/{},
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/*InitArgs=*/{});
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// Always insert a call to __tsan_init into the module's CTORs.
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IRBuilder<> IRB(M.getContext());
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IntptrTy = IRB.getIntPtrTy(DL);
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Value *TsanInit = M.getOrInsertFunction("__tsan_init",
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IRB.getVoidTy(), nullptr);
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appendToGlobalCtors(M, cast<Function>(TsanInit), 0);
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appendToGlobalCtors(M, TsanCtorFunction, 0);
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return true;
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}
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@ -329,6 +332,10 @@ static bool isAtomic(Instruction *I) {
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}
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bool ThreadSanitizer::runOnFunction(Function &F) {
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// This is required to prevent instrumenting call to __tsan_init from within
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// the module constructor.
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if (&F == TsanCtorFunction)
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return false;
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initializeCallbacks(*F.getParent());
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SmallVector<Instruction*, 8> RetVec;
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SmallVector<Instruction*, 8> AllLoadsAndStores;
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@ -9,7 +9,7 @@ entry:
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ret i32 %tmp1
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}
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; CHECK: @llvm.global_ctors = {{.*}}@__tsan_init
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; CHECK: @llvm.global_ctors = {{.*}}@tsan.module_ctor
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; CHECK: define i32 @read_4_bytes(i32* %a)
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; CHECK: call void @__tsan_func_entry(i8* %0)
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@ -53,3 +53,6 @@ entry:
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; CHECK: call i8* @memset
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; CHECK: ret void
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}
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; CHECK: define internal void @tsan.module_ctor()
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; CHECK: call void @__tsan_init()
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