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[asan] fix a bug (issue 19) where dlclose and the following mmap caused a false positive. compiler part.

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llvm-svn: 146688
This commit is contained in:
Kostya Serebryany
2011-12-15 21:59:03 +00:00
parent 9366d42e91
commit cd1aba8b4d
3 changed files with 35 additions and 5 deletions
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16
llvm/lib/Transforms/Utils/ModuleUtils.cpp
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@@ -19,7 +19,8 @@
using namespace llvm;
void llvm::appendToGlobalCtors(Module &M, Function *F, int Priority) {
static void appendToGlobalArray(const char *Array,
Module &M, Function *F, int Priority) {
IRBuilder<> IRB(M.getContext());
FunctionType *FnTy = FunctionType::get(IRB.getVoidTy(), false);
StructType *Ty = StructType::get(
@@ -31,7 +32,7 @@ void llvm::appendToGlobalCtors(Module &M, Function *F, int Priority) {
// Get the current set of static global constructors and add the new ctor
// to the list.
SmallVector<Constant *, 16> CurrentCtors;
if (GlobalVariable * GVCtor = M.getNamedGlobal("llvm.global_ctors")) {
if (GlobalVariable * GVCtor = M.getNamedGlobal(Array)) {
if (Constant *Init = GVCtor->getInitializer()) {
unsigned n = Init->getNumOperands();
CurrentCtors.reserve(n + 1);
@@ -51,6 +52,13 @@ void llvm::appendToGlobalCtors(Module &M, Function *F, int Priority) {
// Create the new global variable and replace all uses of
// the old global variable with the new one.
(void)new GlobalVariable(M, NewInit->getType(), false,
GlobalValue::AppendingLinkage, NewInit,
"llvm.global_ctors");
GlobalValue::AppendingLinkage, NewInit, Array);
}
void llvm::appendToGlobalCtors(Module &M, Function *F, int Priority) {
appendToGlobalArray("llvm.global_ctors", M, F, Priority);
}
void llvm::appendToGlobalDtors(Module &M, Function *F, int Priority) {
appendToGlobalArray("llvm.global_dtors", M, F, Priority);
}