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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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146284 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -163,6 +163,8 @@ struct AddressSanitizer : public ModulePass {
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private:
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void appendToPreinitArray(Module &M, Function *F);
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uint64_t getAllocaSizeInBytes(AllocaInst *AI) {
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Type *Ty = AI->getAllocatedType();
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uint64_t SizeInBytes = TD->getTypeStoreSizeInBits(Ty) / 8;
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@ -563,6 +565,18 @@ bool AddressSanitizer::insertGlobalRedzones(Module &M) {
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return true;
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}
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// .preinit_array is something that hapens before all other inits.
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// On systems where .preinit_array is honored, we will call __asan_init early.
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// On other systems this will make no effect.
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void AddressSanitizer::appendToPreinitArray(Module &M, Function *F) {
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IRBuilder<> IRB(M.getContext());
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GlobalVariable *Var =
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new GlobalVariable(M, PointerType::getUnqual(F->getFunctionType()),
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false, GlobalValue::PrivateLinkage,
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F, "__asan_preinit_private");
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Var->setSection(".preinit_array");
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}
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// virtual
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bool AddressSanitizer::runOnModule(Module &M) {
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// Initialize the private fields. No one has accessed them before.
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@ -633,6 +647,7 @@ bool AddressSanitizer::runOnModule(Module &M) {
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}
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appendToGlobalCtors(M, AsanCtorFunction, 1 /*high priority*/);
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appendToPreinitArray(M, AsanInitFunction);
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return Res;
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}
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