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CodeGen: minor style tweaks to SSP

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Clean up some style related things in the StackProtector CodeGen.  NFC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224693 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Saleem Abdulrasool 2014-12-21 21:52:38 +00:00
parent b10afb51d6
commit 11dd9c3d55
1 changed files with 15 additions and 13 deletions
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28
lib/CodeGen/StackProtector.cpp
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@ -333,7 +333,7 @@ static CallInst *FindPotentialTailCall(BasicBlock *BB, ReturnInst *RI,
/// Returns true if the platform/triple supports the stackprotectorcreate pseudo
/// node.
static bool CreatePrologue(Function *F, Module *M, ReturnInst *RI,
const TargetLoweringBase *TLI, const Triple &Trip,
const TargetLoweringBase *TLI, const Triple &TT,
AllocaInst *&AI, Value *&StackGuardVar) {
bool SupportsSelectionDAGSP = false;
PointerType *PtrTy = Type::getInt8PtrTy(RI->getContext());
@ -342,9 +342,10 @@ static bool CreatePrologue(Function *F, Module *M, ReturnInst *RI,
Constant *OffsetVal =
ConstantInt::get(Type::getInt32Ty(RI->getContext()), Offset);
StackGuardVar = ConstantExpr::getIntToPtr(
OffsetVal, PointerType::get(PtrTy, AddressSpace));
} else if (Trip.isOSOpenBSD()) {
StackGuardVar =
ConstantExpr::getIntToPtr(OffsetVal, PointerType::get(PtrTy,
AddressSpace));
} else if (TT.isOSOpenBSD()) {
StackGuardVar = M->getOrInsertGlobal("__guard_local", PtrTy);
cast<GlobalValue>(StackGuardVar)
->setVisibility(GlobalValue::HiddenVisibility);
@ -397,14 +398,13 @@ bool StackProtector::InsertStackProtectors() {
InsertionPt = RI;
// At this point we know that BB has a return statement so it *DOES*
// have a terminator.
assert(InsertionPt != nullptr && "BB must have a terminator instruction at "
"this point.");
assert(InsertionPt != nullptr &&
"BB must have a terminator instruction at this point.");
}
Function *Intrinsic =
Intrinsic::getDeclaration(M, Intrinsic::stackprotectorcheck);
CallInst::Create(Intrinsic, StackGuardVar, "", InsertionPt);
} else {
// If we do not support SelectionDAG based tail calls, generate IR level
// tail calls.
@ -467,7 +467,7 @@ bool StackProtector::InsertStackProtectors() {
}
}
// Return if we didn't modify any basic blocks. I.e., there are no return
// Return if we didn't modify any basic blocks. i.e., there are no return
// statements in the function.
if (!HasPrologue)
return false;
@ -482,14 +482,16 @@ BasicBlock *StackProtector::CreateFailBB() {
BasicBlock *FailBB = BasicBlock::Create(Context, "CallStackCheckFailBlk", F);
IRBuilder<> B(FailBB);
if (Trip.isOSOpenBSD()) {
Constant *StackChkFail = M->getOrInsertFunction(
"__stack_smash_handler", Type::getVoidTy(Context),
Type::getInt8PtrTy(Context), nullptr);
Constant *StackChkFail =
M->getOrInsertFunction("__stack_smash_handler",
Type::getVoidTy(Context),
Type::getInt8PtrTy(Context), nullptr);
B.CreateCall(StackChkFail, B.CreateGlobalStringPtr(F->getName(), "SSH"));
} else {
Constant *StackChkFail = M->getOrInsertFunction(
"__stack_chk_fail", Type::getVoidTy(Context), nullptr);
Constant *StackChkFail =
M->getOrInsertFunction("__stack_chk_fail", Type::getVoidTy(Context),
nullptr);
B.CreateCall(StackChkFail);
}
B.CreateUnreachable();