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[asan] call __asan_init from .preinit_array. This simplifies __asan_init vs malloc chicken-and-egg situation on Android and probably on other flavours of Linux. Patch by eugenis@google.com.

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llvm-svn: 146284
This commit is contained in:
Kostya Serebryany 2011-12-09 22:09:32 +00:00
parent 356ad6d232
commit e3281eff91
1 changed files with 15 additions and 0 deletions
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15
lib/Transforms/Instrumentation/AddressSanitizer.cpp
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@ -163,6 +163,8 @@ struct AddressSanitizer : public ModulePass {
private:
void appendToPreinitArray(Module &M, Function *F);
uint64_t getAllocaSizeInBytes(AllocaInst *AI) {
Type *Ty = AI->getAllocatedType();
uint64_t SizeInBytes = TD->getTypeStoreSizeInBits(Ty) / 8;
@ -563,6 +565,18 @@ bool AddressSanitizer::insertGlobalRedzones(Module &M) {
return true;
}
// .preinit_array is something that hapens before all other inits.
// On systems where .preinit_array is honored, we will call __asan_init early.
// On other systems this will make no effect.
void AddressSanitizer::appendToPreinitArray(Module &M, Function *F) {
IRBuilder<> IRB(M.getContext());
GlobalVariable *Var =
new GlobalVariable(M, PointerType::getUnqual(F->getFunctionType()),
false, GlobalValue::PrivateLinkage,
F, "__asan_preinit_private");
Var->setSection(".preinit_array");
}
// virtual
bool AddressSanitizer::runOnModule(Module &M) {
// Initialize the private fields. No one has accessed them before.
@ -633,6 +647,7 @@ bool AddressSanitizer::runOnModule(Module &M) {
}
appendToGlobalCtors(M, AsanCtorFunction, 1 /*high priority*/);
appendToPreinitArray(M, AsanInitFunction);
return Res;
}