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

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
llvm/include/llvm/Analysis/EHPersonalities.h
View File

@ -12,6 +12,7 @@
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/TinyPtrVector.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Support/ErrorHandling.h"
namespace llvm {
@ -39,6 +40,10 @@ enum class EHPersonality {
/// Unknown.
EHPersonality classifyEHPersonality(const Value *Pers);
StringRef getEHPersonalityName(EHPersonality Pers);
EHPersonality getDefaultEHPersonality(const Triple &T);
/// \brief Returns true if this personality function catches asynchronous
/// exceptions.
inline bool isAsynchronousEHPersonality(EHPersonality Pers) {

49
llvm/include/llvm/Transforms/Utils/EscapeEnumerator.h Normal file
View File

@ -0,0 +1,49 @@
//===-- EscapeEnumerator.h --------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Defines a helper class that enumerates all possible exits from a function,
// including exception handling.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TRANSFORMS_UTILS_ESCAPEENUMERATOR_H
#define LLVM_TRANSFORMS_UTILS_ESCAPEENUMERATOR_H
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Function.h"
namespace llvm {
/// EscapeEnumerator - This is a little algorithm to find all escape points
/// from a function so that "finally"-style code can be inserted. In addition
/// to finding the existing return and unwind instructions, it also (if
/// necessary) transforms any call instructions into invokes and sends them to
/// a landing pad.
class EscapeEnumerator {
Function &F;
const char *CleanupBBName;
Function::iterator StateBB, StateE;
IRBuilder<> Builder;
bool Done;
bool HandleExceptions;
public:
EscapeEnumerator(Function &F, const char *N = "cleanup",
bool HandleExceptions = true)
: F(F), CleanupBBName(N), StateBB(F.begin()), StateE(F.end()),
Builder(F.getContext()), Done(false),
HandleExceptions(HandleExceptions) {}
IRBuilder<> *Next();
};
}
#endif // LLVM_TRANSFORMS_UTILS_ESCAPEENUMERATOR_H

7
llvm/include/llvm/Transforms/Utils/Local.h
View File

@ -314,6 +314,13 @@ unsigned removeAllNonTerminatorAndEHPadInstructions(BasicBlock *BB);
/// instruction, making it and the rest of the code in the block dead.
unsigned changeToUnreachable(Instruction *I, bool UseLLVMTrap);
/// Convert the CallInst to InvokeInst with the specified unwind edge basic
/// block. This also splits the basic block where CI is located, because
/// InvokeInst is a terminator instruction. Returns the newly split basic
/// block.
BasicBlock *changeToInvokeAndSplitBasicBlock(CallInst *CI,
BasicBlock *UnwindEdge);
/// Replace 'BB's terminator with one that does not have an unwind successor
/// block. Rewrites `invoke` to `call`, etc. Updates any PHIs in unwind
/// successor.

23
llvm/lib/Analysis/EHPersonalities.cpp
View File

@ -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

116
llvm/lib/CodeGen/ShadowStackGCLowering.cpp
View File

@ -23,6 +23,7 @@
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Module.h"
#include "llvm/Transforms/Utils/EscapeEnumerator.h"
using namespace llvm;
@ -81,121 +82,6 @@ ShadowStackGCLowering::ShadowStackGCLowering()
initializeShadowStackGCLoweringPass(*PassRegistry::getPassRegistry());
}
namespace {
/// EscapeEnumerator - This is a little algorithm to find all escape points
/// from a function so that "finally"-style code can be inserted. In addition
/// to finding the existing return and unwind instructions, it also (if
/// necessary) transforms any call instructions into invokes and sends them to
/// a landing pad.
///
/// It's wrapped up in a state machine using the same transform C# uses for
/// 'yield return' enumerators, This transform allows it to be non-allocating.
class EscapeEnumerator {
Function &F;
const char *CleanupBBName;
// State.
int State;
Function::iterator StateBB, StateE;
IRBuilder<> Builder;
public:
EscapeEnumerator(Function &F, const char *N = "cleanup")
: F(F), CleanupBBName(N), State(0), Builder(F.getContext()) {}
IRBuilder<> *Next() {
switch (State) {
default:
return nullptr;
case 0:
StateBB = F.begin();
StateE = F.end();
State = 1;
case 1:
// Find all 'return', 'resume', and 'unwind' instructions.
while (StateBB != StateE) {
BasicBlock *CurBB = &*StateBB++;
// Branches and invokes do not escape, only unwind, resume, and return
// do.
TerminatorInst *TI = CurBB->getTerminator();
if (!isa<ReturnInst>(TI) && !isa<ResumeInst>(TI))
continue;
Builder.SetInsertPoint(TI);
return &Builder;
}
State = 2;
// Find all 'call' instructions.
SmallVector<Instruction *, 16> Calls;
for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
for (BasicBlock::iterator II = BB->begin(), EE = BB->end(); II != EE;
++II)
if (CallInst *CI = dyn_cast<CallInst>(II))
if (!CI->getCalledFunction() ||
!CI->getCalledFunction()->getIntrinsicID())
Calls.push_back(CI);
if (Calls.empty())
return nullptr;
// Create a cleanup block.
LLVMContext &C = F.getContext();
BasicBlock *CleanupBB = BasicBlock::Create(C, CleanupBBName, &F);
Type *ExnTy =
StructType::get(Type::getInt8PtrTy(C), Type::getInt32Ty(C), nullptr);
if (!F.hasPersonalityFn()) {
Constant *PersFn = F.getParent()->getOrInsertFunction(
"__gcc_personality_v0",
FunctionType::get(Type::getInt32Ty(C), true));
F.setPersonalityFn(PersFn);
}
LandingPadInst *LPad =
LandingPadInst::Create(ExnTy, 1, "cleanup.lpad", CleanupBB);
LPad->setCleanup(true);
ResumeInst *RI = ResumeInst::Create(LPad, CleanupBB);
// Transform the 'call' instructions into 'invoke's branching to the
// cleanup block. Go in reverse order to make prettier BB names.
SmallVector<Value *, 16> Args;
for (unsigned I = Calls.size(); I != 0;) {
CallInst *CI = cast<CallInst>(Calls[--I]);
// Split the basic block containing the function call.
BasicBlock *CallBB = CI->getParent();
BasicBlock *NewBB = CallBB->splitBasicBlock(
CI->getIterator(), CallBB->getName() + ".cont");
// Remove the unconditional branch inserted at the end of CallBB.
CallBB->getInstList().pop_back();
NewBB->getInstList().remove(CI);
// Create a new invoke instruction.
Args.clear();
CallSite CS(CI);
Args.append(CS.arg_begin(), CS.arg_end());
InvokeInst *II =
InvokeInst::Create(CI->getCalledValue(), NewBB, CleanupBB, Args,
CI->getName(), CallBB);
II->setCallingConv(CI->getCallingConv());
II->setAttributes(CI->getAttributes());
CI->replaceAllUsesWith(II);
delete CI;
}
Builder.SetInsertPoint(RI);
return &Builder;
}
}
};
}
Constant *ShadowStackGCLowering::GetFrameMap(Function &F) {
// doInitialization creates the abstract type of this value.
Type *VoidPtr = Type::getInt8PtrTy(F.getContext());

68
llvm/lib/Transforms/Instrumentation/ThreadSanitizer.cpp
View File

@ -43,6 +43,7 @@
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/Transforms/Utils/EscapeEnumerator.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Transforms/Utils/ModuleUtils.h"
@ -56,6 +57,10 @@ static cl::opt<bool> ClInstrumentMemoryAccesses(
static cl::opt<bool> ClInstrumentFuncEntryExit(
"tsan-instrument-func-entry-exit", cl::init(true),
cl::desc("Instrument function entry and exit"), cl::Hidden);
static cl::opt<bool> ClHandleCxxExceptions(
"tsan-handle-cxx-exceptions", cl::init(true),
cl::desc("Handle C++ exceptions (insert cleanup blocks for unwinding)"),
cl::Hidden);
static cl::opt<bool> ClInstrumentAtomics(
"tsan-instrument-atomics", cl::init(true),
cl::desc("Instrument atomics"), cl::Hidden);
@ -99,7 +104,7 @@ struct ThreadSanitizer : public FunctionPass {
const DataLayout &DL);
bool addrPointsToConstantData(Value *Addr);
int getMemoryAccessFuncIndex(Value *Addr, const DataLayout &DL);
void InsertRuntimeIgnores(Function &F, SmallVector<Instruction*, 8> &RetVec);
void InsertRuntimeIgnores(Function &F);
Type *IntptrTy;
IntegerType *OrdTy;
@ -150,15 +155,17 @@ FunctionPass *llvm::createThreadSanitizerPass() {
void ThreadSanitizer::initializeCallbacks(Module &M) {
IRBuilder<> IRB(M.getContext());
AttributeSet Attr;
Attr = Attr.addAttribute(M.getContext(), AttributeSet::FunctionIndex, Attribute::NoUnwind);
// Initialize the callbacks.
TsanFuncEntry = checkSanitizerInterfaceFunction(M.getOrInsertFunction(
"__tsan_func_entry", IRB.getVoidTy(), IRB.getInt8PtrTy(), nullptr));
"__tsan_func_entry", Attr, IRB.getVoidTy(), IRB.getInt8PtrTy(), nullptr));
TsanFuncExit = checkSanitizerInterfaceFunction(
M.getOrInsertFunction("__tsan_func_exit", IRB.getVoidTy(), nullptr));
M.getOrInsertFunction("__tsan_func_exit", Attr, IRB.getVoidTy(), nullptr));
TsanIgnoreBegin = checkSanitizerInterfaceFunction(M.getOrInsertFunction(
"__tsan_ignore_thread_begin", IRB.getVoidTy(), nullptr));
"__tsan_ignore_thread_begin", Attr, IRB.getVoidTy(), nullptr));
TsanIgnoreEnd = checkSanitizerInterfaceFunction(M.getOrInsertFunction(
"__tsan_ignore_thread_end", IRB.getVoidTy(), nullptr));
"__tsan_ignore_thread_end", Attr, IRB.getVoidTy(), nullptr));
OrdTy = IRB.getInt32Ty();
for (size_t i = 0; i < kNumberOfAccessSizes; ++i) {
const unsigned ByteSize = 1U << i;
@ -167,31 +174,31 @@ void ThreadSanitizer::initializeCallbacks(Module &M) {
std::string BitSizeStr = utostr(BitSize);
SmallString<32> ReadName("__tsan_read" + ByteSizeStr);
TsanRead[i] = checkSanitizerInterfaceFunction(M.getOrInsertFunction(
ReadName, IRB.getVoidTy(), IRB.getInt8PtrTy(), nullptr));
ReadName, Attr, IRB.getVoidTy(), IRB.getInt8PtrTy(), nullptr));
SmallString<32> WriteName("__tsan_write" + ByteSizeStr);
TsanWrite[i] = checkSanitizerInterfaceFunction(M.getOrInsertFunction(
WriteName, IRB.getVoidTy(), IRB.getInt8PtrTy(), nullptr));
WriteName, Attr, IRB.getVoidTy(), IRB.getInt8PtrTy(), nullptr));
SmallString<64> UnalignedReadName("__tsan_unaligned_read" + ByteSizeStr);
TsanUnalignedRead[i] =
checkSanitizerInterfaceFunction(M.getOrInsertFunction(
UnalignedReadName, IRB.getVoidTy(), IRB.getInt8PtrTy(), nullptr));
UnalignedReadName, Attr, IRB.getVoidTy(), IRB.getInt8PtrTy(), nullptr));
SmallString<64> UnalignedWriteName("__tsan_unaligned_write" + ByteSizeStr);
TsanUnalignedWrite[i] =
checkSanitizerInterfaceFunction(M.getOrInsertFunction(
UnalignedWriteName, IRB.getVoidTy(), IRB.getInt8PtrTy(), nullptr));
UnalignedWriteName, Attr, IRB.getVoidTy(), IRB.getInt8PtrTy(), nullptr));
Type *Ty = Type::getIntNTy(M.getContext(), BitSize);
Type *PtrTy = Ty->getPointerTo();
SmallString<32> AtomicLoadName("__tsan_atomic" + BitSizeStr + "_load");
TsanAtomicLoad[i] = checkSanitizerInterfaceFunction(
M.getOrInsertFunction(AtomicLoadName, Ty, PtrTy, OrdTy, nullptr));
M.getOrInsertFunction(AtomicLoadName, Attr, Ty, PtrTy, OrdTy, nullptr));
SmallString<32> AtomicStoreName("__tsan_atomic" + BitSizeStr + "_store");
TsanAtomicStore[i] = checkSanitizerInterfaceFunction(M.getOrInsertFunction(
AtomicStoreName, IRB.getVoidTy(), PtrTy, Ty, OrdTy, nullptr));
AtomicStoreName, Attr, IRB.getVoidTy(), PtrTy, Ty, OrdTy, nullptr));
for (int op = AtomicRMWInst::FIRST_BINOP;
op <= AtomicRMWInst::LAST_BINOP; ++op) {
@ -215,32 +222,32 @@ void ThreadSanitizer::initializeCallbacks(Module &M) {
continue;
SmallString<32> RMWName("__tsan_atomic" + itostr(BitSize) + NamePart);
TsanAtomicRMW[op][i] = checkSanitizerInterfaceFunction(
M.getOrInsertFunction(RMWName, Ty, PtrTy, Ty, OrdTy, nullptr));
M.getOrInsertFunction(RMWName, Attr, Ty, PtrTy, Ty, OrdTy, nullptr));
}
SmallString<32> AtomicCASName("__tsan_atomic" + BitSizeStr +
"_compare_exchange_val");
TsanAtomicCAS[i] = checkSanitizerInterfaceFunction(M.getOrInsertFunction(
AtomicCASName, Ty, PtrTy, Ty, Ty, OrdTy, OrdTy, nullptr));
AtomicCASName, Attr, Ty, PtrTy, Ty, Ty, OrdTy, OrdTy, nullptr));
}
TsanVptrUpdate = checkSanitizerInterfaceFunction(
M.getOrInsertFunction("__tsan_vptr_update", IRB.getVoidTy(),
M.getOrInsertFunction("__tsan_vptr_update", Attr, IRB.getVoidTy(),
IRB.getInt8PtrTy(), IRB.getInt8PtrTy(), nullptr));
TsanVptrLoad = checkSanitizerInterfaceFunction(M.getOrInsertFunction(
"__tsan_vptr_read", IRB.getVoidTy(), IRB.getInt8PtrTy(), nullptr));
"__tsan_vptr_read", Attr, IRB.getVoidTy(), IRB.getInt8PtrTy(), nullptr));
TsanAtomicThreadFence = checkSanitizerInterfaceFunction(M.getOrInsertFunction(
"__tsan_atomic_thread_fence", IRB.getVoidTy(), OrdTy, nullptr));
"__tsan_atomic_thread_fence", Attr, IRB.getVoidTy(), OrdTy, nullptr));
TsanAtomicSignalFence = checkSanitizerInterfaceFunction(M.getOrInsertFunction(
"__tsan_atomic_signal_fence", IRB.getVoidTy(), OrdTy, nullptr));
"__tsan_atomic_signal_fence", Attr, IRB.getVoidTy(), OrdTy, nullptr));
MemmoveFn = checkSanitizerInterfaceFunction(
M.getOrInsertFunction("memmove", IRB.getInt8PtrTy(), IRB.getInt8PtrTy(),
M.getOrInsertFunction("memmove", Attr, IRB.getInt8PtrTy(), IRB.getInt8PtrTy(),
IRB.getInt8PtrTy(), IntptrTy, nullptr));
MemcpyFn = checkSanitizerInterfaceFunction(
M.getOrInsertFunction("memcpy", IRB.getInt8PtrTy(), IRB.getInt8PtrTy(),
M.getOrInsertFunction("memcpy", Attr, IRB.getInt8PtrTy(), IRB.getInt8PtrTy(),
IRB.getInt8PtrTy(), IntptrTy, nullptr));
MemsetFn = checkSanitizerInterfaceFunction(
M.getOrInsertFunction("memset", IRB.getInt8PtrTy(), IRB.getInt8PtrTy(),
M.getOrInsertFunction("memset", Attr, IRB.getInt8PtrTy(), IRB.getInt8PtrTy(),
IRB.getInt32Ty(), IntptrTy, nullptr));
}
@ -383,13 +390,12 @@ static bool isAtomic(Instruction *I) {
return false;
}
void ThreadSanitizer::InsertRuntimeIgnores(Function &F,
SmallVector<Instruction*, 8> &RetVec) {
void ThreadSanitizer::InsertRuntimeIgnores(Function &F) {
IRBuilder<> IRB(F.getEntryBlock().getFirstNonPHI());
IRB.CreateCall(TsanIgnoreBegin);
for (auto RetInst : RetVec) {
IRBuilder<> IRB(RetInst);
IRB.CreateCall(TsanIgnoreEnd);
EscapeEnumerator EE(F, "tsan_ignore_cleanup", ClHandleCxxExceptions);
while (IRBuilder<> *AtExit = EE.Next()) {
AtExit->CreateCall(TsanIgnoreEnd);
}
}
@ -399,7 +405,6 @@ bool ThreadSanitizer::runOnFunction(Function &F) {
if (&F == TsanCtorFunction)
return false;
initializeCallbacks(*F.getParent());
SmallVector<Instruction*, 8> RetVec;
SmallVector<Instruction*, 8> AllLoadsAndStores;
SmallVector<Instruction*, 8> LocalLoadsAndStores;
SmallVector<Instruction*, 8> AtomicAccesses;
@ -418,8 +423,6 @@ bool ThreadSanitizer::runOnFunction(Function &F) {
AtomicAccesses.push_back(&Inst);
else if (isa<LoadInst>(Inst) || isa<StoreInst>(Inst))
LocalLoadsAndStores.push_back(&Inst);
else if (isa<ReturnInst>(Inst))
RetVec.push_back(&Inst);
else if (isa<CallInst>(Inst) || isa<InvokeInst>(Inst)) {
if (CallInst *CI = dyn_cast<CallInst>(&Inst))
maybeMarkSanitizerLibraryCallNoBuiltin(CI, TLI);
@ -458,7 +461,7 @@ bool ThreadSanitizer::runOnFunction(Function &F) {
if (F.hasFnAttribute("sanitize_thread_no_checking_at_run_time")) {
assert(!F.hasFnAttribute(Attribute::SanitizeThread));
if (HasCalls)
InsertRuntimeIgnores(F, RetVec);
InsertRuntimeIgnores(F);
}
// Instrument function entry/exit points if there were instrumented accesses.
@ -468,9 +471,10 @@ bool ThreadSanitizer::runOnFunction(Function &F) {
Intrinsic::getDeclaration(F.getParent(), Intrinsic::returnaddress),
IRB.getInt32(0));
IRB.CreateCall(TsanFuncEntry, ReturnAddress);
for (auto RetInst : RetVec) {
IRBuilder<> IRBRet(RetInst);
IRBRet.CreateCall(TsanFuncExit, {});
EscapeEnumerator EE(F, "tsan_cleanup", ClHandleCxxExceptions);
while (IRBuilder<> *AtExit = EE.Next()) {
AtExit->CreateCall(TsanFuncExit, {});
}
Res = true;
}

1
llvm/lib/Transforms/Utils/CMakeLists.txt
View File

@ -11,6 +11,7 @@ add_llvm_library(LLVMTransformUtils
CodeExtractor.cpp
CtorUtils.cpp
DemoteRegToStack.cpp
EscapeEnumerator.cpp
Evaluator.cpp
FlattenCFG.cpp
FunctionComparator.cpp

96
llvm/lib/Transforms/Utils/EscapeEnumerator.cpp Normal file
View File

@ -0,0 +1,96 @@
//===- EscapeEnumerator.cpp -----------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Defines a helper class that enumerates all possible exits from a function,
// including exception handling.
//
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/Utils/EscapeEnumerator.h"
#include "llvm/Analysis/EHPersonalities.h"
#include "llvm/IR/CallSite.h"
#include "llvm/IR/Module.h"
#include "llvm/Transforms/Utils/Local.h"
using namespace llvm;
static Constant *getDefaultPersonalityFn(Module *M) {
LLVMContext &C = M->getContext();
Triple T(M->getTargetTriple());
EHPersonality Pers = getDefaultEHPersonality(T);
return M->getOrInsertFunction(getEHPersonalityName(Pers),
FunctionType::get(Type::getInt32Ty(C), true));
}
IRBuilder<> *EscapeEnumerator::Next() {
if (Done)
return nullptr;
// Find all 'return', 'resume', and 'unwind' instructions.
while (StateBB != StateE) {
BasicBlock *CurBB = &*StateBB++;
// Branches and invokes do not escape, only unwind, resume, and return
// do.
TerminatorInst *TI = CurBB->getTerminator();
if (!isa<ReturnInst>(TI) && !isa<ResumeInst>(TI))
continue;
Builder.SetInsertPoint(TI);
return &Builder;
}
Done = true;
if (!HandleExceptions)
return nullptr;
if (F.doesNotThrow())
return nullptr;
// Find all 'call' instructions that may throw.
SmallVector<Instruction *, 16> Calls;
for (BasicBlock &BB : F)
for (Instruction &II : BB)
if (CallInst *CI = dyn_cast<CallInst>(&II))
if (!CI->doesNotThrow())
Calls.push_back(CI);
if (Calls.empty())
return nullptr;
// Create a cleanup block.
LLVMContext &C = F.getContext();
BasicBlock *CleanupBB = BasicBlock::Create(C, CleanupBBName, &F);
Type *ExnTy =
StructType::get(Type::getInt8PtrTy(C), Type::getInt32Ty(C), nullptr);
if (!F.hasPersonalityFn()) {
Constant *PersFn = getDefaultPersonalityFn(F.getParent());
F.setPersonalityFn(PersFn);
}
if (isFuncletEHPersonality(classifyEHPersonality(F.getPersonalityFn()))) {
report_fatal_error("Funclet EH not supported");
}
LandingPadInst *LPad =
LandingPadInst::Create(ExnTy, 1, "cleanup.lpad", CleanupBB);
LPad->setCleanup(true);
ResumeInst *RI = ResumeInst::Create(LPad, CleanupBB);
// Transform the 'call' instructions into 'invoke's branching to the
// cleanup block. Go in reverse order to make prettier BB names.
SmallVector<Value *, 16> Args;
for (unsigned I = Calls.size(); I != 0;) {
CallInst *CI = cast<CallInst>(Calls[--I]);
changeToInvokeAndSplitBasicBlock(CI, CleanupBB);
}
Builder.SetInsertPoint(RI);
return &Builder;
}

32
llvm/lib/Transforms/Utils/InlineFunction.cpp
View File

@ -535,37 +535,7 @@ static BasicBlock *HandleCallsInBlockInlinedThroughInvoke(
#endif // NDEBUG
}
// Convert this function call into an invoke instruction. First, split the
// basic block.
BasicBlock *Split =
BB->splitBasicBlock(CI->getIterator(), CI->getName() + ".noexc");
// Delete the unconditional branch inserted by splitBasicBlock
BB->getInstList().pop_back();
// Create the new invoke instruction.
SmallVector<Value*, 8> InvokeArgs(CI->arg_begin(), CI->arg_end());
SmallVector<OperandBundleDef, 1> OpBundles;
CI->getOperandBundlesAsDefs(OpBundles);
// Note: we're round tripping operand bundles through memory here, and that
// can potentially be avoided with a cleverer API design that we do not have
// as of this time.
InvokeInst *II =
InvokeInst::Create(CI->getCalledValue(), Split, UnwindEdge, InvokeArgs,
OpBundles, CI->getName(), BB);
II->setDebugLoc(CI->getDebugLoc());
II->setCallingConv(CI->getCallingConv());
II->setAttributes(CI->getAttributes());
// Make sure that anything using the call now uses the invoke! This also
// updates the CallGraph if present, because it uses a WeakVH.
CI->replaceAllUsesWith(II);
// Delete the original call
Split->getInstList().pop_front();
changeToInvokeAndSplitBasicBlock(CI, UnwindEdge);
return BB;
}
return nullptr;

37
llvm/lib/Transforms/Utils/Local.cpp
View File

@ -1408,6 +1408,43 @@ static void changeToCall(InvokeInst *II) {
II->eraseFromParent();
}
BasicBlock *llvm::changeToInvokeAndSplitBasicBlock(CallInst *CI,
BasicBlock *UnwindEdge) {
BasicBlock *BB = CI->getParent();
// Convert this function call into an invoke instruction. First, split the
// basic block.
BasicBlock *Split =
BB->splitBasicBlock(CI->getIterator(), CI->getName() + ".noexc");
// Delete the unconditional branch inserted by splitBasicBlock
BB->getInstList().pop_back();
// Create the new invoke instruction.
SmallVector<Value *, 8> InvokeArgs(CI->arg_begin(), CI->arg_end());
SmallVector<OperandBundleDef, 1> OpBundles;
CI->getOperandBundlesAsDefs(OpBundles);
// Note: we're round tripping operand bundles through memory here, and that
// can potentially be avoided with a cleverer API design that we do not have
// as of this time.
InvokeInst *II = InvokeInst::Create(CI->getCalledValue(), Split, UnwindEdge,
InvokeArgs, OpBundles, CI->getName(), BB);
II->setDebugLoc(CI->getDebugLoc());
II->setCallingConv(CI->getCallingConv());
II->setAttributes(CI->getAttributes());
// Make sure that anything using the call now uses the invoke! This also
// updates the CallGraph if present, because it uses a WeakVH.
CI->replaceAllUsesWith(II);
// Delete the original call
Split->getInstList().pop_front();
return Split;
}
static bool markAliveBlocks(Function &F,
SmallPtrSetImpl<BasicBlock*> &Reachable) {

57
llvm/test/Instrumentation/ThreadSanitizer/eh.ll Normal file
View File

@ -0,0 +1,57 @@
; RUN: opt < %s -tsan -S | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-EXC
; RUN: opt < %s -tsan -S -tsan-handle-cxx-exceptions=0 | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-NOEXC
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
declare void @can_throw()
declare void @cannot_throw() nounwind
define i32 @func1() sanitize_thread {
call void @can_throw()
ret i32 0
; CHECK-EXC: define i32 @func1()
; CHECK-EXC: call void @__tsan_func_entry
; CHECK-EXC: invoke void @can_throw()
; CHECK-EXC: .noexc:
; CHECK-EXC: call void @__tsan_func_exit()
; CHECK-EXC: ret i32 0
; CHECK-EXC: tsan_cleanup:
; CHECK-EXC: call void @__tsan_func_exit()
; CHECK-EXC: resume
; CHECK-NOEXC: define i32 @func1()
; CHECK-NOEXC: call void @__tsan_func_entry
; CHECK-NOEXC: call void @can_throw()
; CHECK-NOEXC: call void @__tsan_func_exit()
; CHECK-NOEXC: ret i32 0
}
define i32 @func2() sanitize_thread {
call void @cannot_throw()
ret i32 0
; CHECK: define i32 @func2()
; CHECK: call void @__tsan_func_entry
; CHECK: call void @cannot_throw()
; CHECK: call void @__tsan_func_exit()
; CHECK: ret i32 0
}
define i32 @func3(i32* %p) sanitize_thread {
%a = load i32, i32* %p
ret i32 %a
; CHECK: define i32 @func3(i32* %p)
; CHECK: call void @__tsan_func_entry
; CHECK: call void @__tsan_read4
; CHECK: %a = load i32, i32* %p
; CHECK: call void @__tsan_func_exit()
; CHECK: ret i32 %a
}
define i32 @func4() sanitize_thread nounwind {
call void @can_throw()
ret i32 0
; CHECK: define i32 @func4()
; CHECK: call void @__tsan_func_entry
; CHECK: call void @can_throw()
; CHECK: call void @__tsan_func_exit()
; CHECK: ret i32 0
}

2
llvm/test/Instrumentation/ThreadSanitizer/no_sanitize_thread.ll
View File

@ -32,5 +32,5 @@ entry:
; CHECK-NEXT: call void @__tsan_func_exit()
; CHECK-NEXT: ret i32 %tmp1
declare void @foo()
declare void @foo() nounwind

2
llvm/test/Instrumentation/ThreadSanitizer/sanitize-thread-no-checking.ll
View File

@ -14,7 +14,7 @@ entry:
; CHECK-NEXT: %tmp1 = load i32, i32* %a, align 4
; CHECK-NEXT: ret i32 %tmp1
declare void @"foo"()
declare void @"foo"() nounwind
define i32 @"\01-[WithCalls dealloc]"(i32* %a) "sanitize_thread_no_checking_at_run_time" {
entry:

14
llvm/test/Instrumentation/ThreadSanitizer/str-nobuiltin.ll
View File

@ -4,13 +4,13 @@
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-unknown-linux-gnu"
declare i8* @memchr(i8* %a, i32 %b, i64 %c)
declare i32 @memcmp(i8* %a, i8* %b, i64 %c)
declare i32 @strcmp(i8* %a, i8* %b)
declare i8* @strcpy(i8* %a, i8* %b)
declare i8* @stpcpy(i8* %a, i8* %b)
declare i64 @strlen(i8* %a)
declare i64 @strnlen(i8* %a, i64 %b)
declare i8* @memchr(i8* %a, i32 %b, i64 %c) nounwind
declare i32 @memcmp(i8* %a, i8* %b, i64 %c) nounwind
declare i32 @strcmp(i8* %a, i8* %b) nounwind
declare i8* @strcpy(i8* %a, i8* %b) nounwind
declare i8* @stpcpy(i8* %a, i8* %b) nounwind
declare i64 @strlen(i8* %a) nounwind
declare i64 @strnlen(i8* %a, i64 %b) nounwind
; CHECK: call{{.*}}@memchr{{.*}} #[[ATTR:[0-9]+]]
; CHECK: call{{.*}}@memcmp{{.*}} #[[ATTR]]