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.
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.