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Add strncpy libcall creator. Use it when it should be used.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98219 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher 2010-03-11 01:25:07 +00:00
parent 52a50e5d0e
commit bd97376200
3 changed files with 27 additions and 1 deletions
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5
include/llvm/Transforms/Utils/BuildLibCalls.h
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@ -39,6 +39,11 @@ namespace llvm {
Value *EmitStrCpy(Value *Dst, Value *Src, IRBuilder<> &B, Value *EmitStrCpy(Value *Dst, Value *Src, IRBuilder<> &B,
const TargetData *TD); const TargetData *TD);
/// EmitStrNCpy - Emit a call to the strncpy function to the builder, for the
/// specified pointer arguments and length.
Value *EmitStrNCpy(Value *Dst, Value *Src, Value *Len, IRBuilder<> &B,
const TargetData *TD);
/// EmitMemCpy - Emit a call to the memcpy function to the builder. This /// EmitMemCpy - Emit a call to the memcpy function to the builder. This
/// always expects that the size has type 'intptr_t' and Dst/Src are pointers. /// always expects that the size has type 'intptr_t' and Dst/Src are pointers.
Value *EmitMemCpy(Value *Dst, Value *Src, Value *Len, Value *EmitMemCpy(Value *Dst, Value *Src, Value *Len,

3
lib/Transforms/InstCombine/InstCombineCalls.cpp
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@ -850,7 +850,8 @@ Instruction *InstCombiner::tryOptimizeCall(CallInst *CI, const TargetData *TD) {
return 0; return 0;
if (SizeCI->isAllOnesValue() || if (SizeCI->isAllOnesValue() ||
SizeCI->getZExtValue() <= SizeArg->getZExtValue()) { SizeCI->getZExtValue() <= SizeArg->getZExtValue()) {
Value *Ret = EmitStrCpy(CI->getOperand(1), CI->getOperand(2), B, TD); Value *Ret = EmitStrNCpy(CI->getOperand(1), CI->getOperand(2),
CI->getOperand(3), B, TD);
return ReplaceInstUsesWith(*CI, Ret); return ReplaceInstUsesWith(*CI, Ret);
} }
return 0; return 0;

20
lib/Transforms/Utils/BuildLibCalls.cpp
View File

@ -87,6 +87,26 @@ Value *llvm::EmitStrCpy(Value *Dst, Value *Src, IRBuilder<> &B,
return CI; return CI;
} }
/// EmitStrNCpy - Emit a call to the strcpy function to the builder, for the
/// specified pointer arguments.
Value *llvm::EmitStrNCpy(Value *Dst, Value *Src, Value *Len,
IRBuilder<> &B, const TargetData *TD) {
Module *M = B.GetInsertBlock()->getParent()->getParent();
AttributeWithIndex AWI[2];
AWI[0] = AttributeWithIndex::get(2, Attribute::NoCapture);
AWI[1] = AttributeWithIndex::get(~0u, Attribute::NoUnwind);
const Type *I8Ptr = B.getInt8PtrTy();
Value *StrNCpy = M->getOrInsertFunction("strncpy", AttrListPtr::get(AWI, 2),
I8Ptr, I8Ptr, I8Ptr,
Len->getType(), NULL);
CallInst *CI = B.CreateCall3(StrNCpy, CastToCStr(Dst, B), CastToCStr(Src, B),
Len, "strncpy");
if (const Function *F = dyn_cast<Function>(StrNCpy->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
/// EmitMemCpy - Emit a call to the memcpy function to the builder. This always /// EmitMemCpy - Emit a call to the memcpy function to the builder. This always
/// expects that the size has type 'intptr_t' and Dst/Src are pointers. /// expects that the size has type 'intptr_t' and Dst/Src are pointers.
Value *llvm::EmitMemCpy(Value *Dst, Value *Src, Value *Len, Value *llvm::EmitMemCpy(Value *Dst, Value *Src, Value *Len,