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add EmitStrNLen()

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160741 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nuno Lopes 2012-07-25 17:18:59 +00:00
parent 84315f03cb
commit a536835230
2 changed files with 33 additions and 0 deletions
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6
include/llvm/Transforms/Utils/BuildLibCalls.h
View File

@ -31,6 +31,12 @@ namespace llvm {
Value *EmitStrLen(Value *Ptr, IRBuilder<> &B, const TargetData *TD,
const TargetLibraryInfo *TLI);
/// EmitStrNLen - Emit a call to the strnlen function to the builder, for the
/// specified pointer. Ptr is required to be some pointer type, MaxLen must
/// be of size_t type, and the return value has 'intptr_t' type.
Value *EmitStrNLen(Value *Ptr, Value *MaxLen, IRBuilder<> &B,
const TargetData *TD, const TargetLibraryInfo *TLI);
/// EmitStrChr - Emit a call to the strchr function to the builder, for the
/// specified pointer and character. Ptr is required to be some pointer type,
/// and the return value has 'i8*' type.

27
lib/Transforms/Utils/BuildLibCalls.cpp
View File

@ -57,6 +57,33 @@ Value *llvm::EmitStrLen(Value *Ptr, IRBuilder<> &B, const TargetData *TD,
return CI;
}
/// EmitStrNLen - Emit a call to the strnlen function to the builder, for the
/// specified pointer. Ptr is required to be some pointer type, MaxLen must
/// be of size_t type, and the return value has 'intptr_t' type.
Value *llvm::EmitStrNLen(Value *Ptr, Value *MaxLen, IRBuilder<> &B,
const TargetData *TD, const TargetLibraryInfo *TLI) {
if (!TLI->has(LibFunc::strnlen))
return 0;
Module *M = B.GetInsertBlock()->getParent()->getParent();
AttributeWithIndex AWI[2];
AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture);
AWI[1] = AttributeWithIndex::get(~0u, Attribute::ReadOnly |
Attribute::NoUnwind);
LLVMContext &Context = B.GetInsertBlock()->getContext();
Constant *StrNLen = M->getOrInsertFunction("strnlen", AttrListPtr::get(AWI),
TD->getIntPtrType(Context),
B.getInt8PtrTy(),
TD->getIntPtrType(Context),
NULL);
CallInst *CI = B.CreateCall2(StrNLen, CastToCStr(Ptr, B), MaxLen, "strnlen");
if (const Function *F = dyn_cast<Function>(StrNLen->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
/// EmitStrChr - Emit a call to the strchr function to the builder, for the
/// specified pointer and character. Ptr is required to be some pointer type,
/// and the return value has 'i8*' type.