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[tsan] Add support for C++ exceptions into TSan (call __tsan_func_exit during unwinding), LLVM part

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This adds support for TSan C++ exception handling, where we need to add extra calls to __tsan_func_exit when a function is exitted via exception mechanisms. Otherwise the shadow stack gets corrupted (leaked). This patch moves and enhances the existing implementation of EscapeEnumerator that finds all possible function exit points, and adds extra EH cleanup blocks where needed.

Differential Revision: https://reviews.llvm.org/D26177

llvm-svn: 286893
This commit is contained in:
Kuba Brecka
2016-11-14 21:41:13 +00:00
parent 5375fe820c
commit ddfdba3b01
14 changed files with 322 additions and 187 deletions
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23
llvm/lib/Analysis/EHPersonalities.cpp
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@@ -40,6 +40,29 @@ EHPersonality llvm::classifyEHPersonality(const Value *Pers) {
.Default(EHPersonality::Unknown);
}
StringRef llvm::getEHPersonalityName(EHPersonality Pers) {
switch (Pers) {
case EHPersonality::GNU_Ada: return "__gnat_eh_personality";
case EHPersonality::GNU_CXX: return "__gxx_personality_v0";
case EHPersonality::GNU_CXX_SjLj: return "__gxx_personality_sj0";
case EHPersonality::GNU_C: return "__gcc_personality_v0";
case EHPersonality::GNU_C_SjLj: return "__gcc_personality_sj0";
case EHPersonality::GNU_ObjC: return "__objc_personality_v0";
case EHPersonality::MSVC_X86SEH: return "_except_handler3";
case EHPersonality::MSVC_Win64SEH: return "__C_specific_handler";
case EHPersonality::MSVC_CXX: return "__CxxFrameHandler3";
case EHPersonality::CoreCLR: return "ProcessCLRException";
case EHPersonality::Rust: return "rust_eh_personality";
case EHPersonality::Unknown: llvm_unreachable("Unknown EHPersonality!");
}
llvm_unreachable("Invalid EHPersonality!");
}
EHPersonality llvm::getDefaultEHPersonality(const Triple &T) {
return EHPersonality::GNU_C;
}
bool llvm::canSimplifyInvokeNoUnwind(const Function *F) {
EHPersonality Personality = classifyEHPersonality(F->getPersonalityFn());
// We can't simplify any invokes to nounwind functions if the personality