//===- BuildLibCalls.cpp - Utility builder for libcalls -------------------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file implements some functions that will create standard C libcalls. // //===----------------------------------------------------------------------===// #include "llvm/Transforms/Utils/BuildLibCalls.h" #include "llvm/ADT/SmallString.h" #include "llvm/IR/Constants.h" #include "llvm/IR/DataLayout.h" #include "llvm/IR/Function.h" #include "llvm/IR/IRBuilder.h" #include "llvm/IR/Intrinsics.h" #include "llvm/IR/LLVMContext.h" #include "llvm/IR/Module.h" #include "llvm/IR/Type.h" #include "llvm/Target/TargetLibraryInfo.h" using namespace llvm; /// CastToCStr - Return V if it is an i8*, otherwise cast it to i8*. Value *llvm::CastToCStr(Value *V, IRBuilder<> &B) { unsigned AS = V->getType()->getPointerAddressSpace(); return B.CreateBitCast(V, B.getInt8PtrTy(AS), "cstr"); } /// EmitStrLen - Emit a call to the strlen function to the builder, for the /// specified pointer. This always returns an integer value of size intptr_t. Value *llvm::EmitStrLen(Value *Ptr, IRBuilder<> &B, const DataLayout *TD, const TargetLibraryInfo *TLI) { if (!TLI->has(LibFunc::strlen)) return nullptr; Module *M = B.GetInsertBlock()->getParent()->getParent(); AttributeSet AS[2]; AS[0] = AttributeSet::get(M->getContext(), 1, Attribute::NoCapture); Attribute::AttrKind AVs[2] = { Attribute::ReadOnly, Attribute::NoUnwind }; AS[1] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, AVs); LLVMContext &Context = B.GetInsertBlock()->getContext(); Constant *StrLen = M->getOrInsertFunction("strlen", AttributeSet::get(M->getContext(), AS), TD->getIntPtrType(Context), B.getInt8PtrTy(), NULL); CallInst *CI = B.CreateCall(StrLen, CastToCStr(Ptr, B), "strlen"); if (const Function *F = dyn_cast(StrLen->stripPointerCasts())) CI->setCallingConv(F->getCallingConv()); 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 DataLayout *TD, const TargetLibraryInfo *TLI) { if (!TLI->has(LibFunc::strnlen)) return nullptr; Module *M = B.GetInsertBlock()->getParent()->getParent(); AttributeSet AS[2]; AS[0] = AttributeSet::get(M->getContext(), 1, Attribute::NoCapture); Attribute::AttrKind AVs[2] = { Attribute::ReadOnly, Attribute::NoUnwind }; AS[1] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, AVs); LLVMContext &Context = B.GetInsertBlock()->getContext(); Constant *StrNLen = M->getOrInsertFunction("strnlen", AttributeSet::get(M->getContext(), AS), 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(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. Value *llvm::EmitStrChr(Value *Ptr, char C, IRBuilder<> &B, const DataLayout *TD, const TargetLibraryInfo *TLI) { if (!TLI->has(LibFunc::strchr)) return nullptr; Module *M = B.GetInsertBlock()->getParent()->getParent(); Attribute::AttrKind AVs[2] = { Attribute::ReadOnly, Attribute::NoUnwind }; AttributeSet AS = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, AVs); Type *I8Ptr = B.getInt8PtrTy(); Type *I32Ty = B.getInt32Ty(); Constant *StrChr = M->getOrInsertFunction("strchr", AttributeSet::get(M->getContext(), AS), I8Ptr, I8Ptr, I32Ty, NULL); CallInst *CI = B.CreateCall2(StrChr, CastToCStr(Ptr, B), ConstantInt::get(I32Ty, C), "strchr"); if (const Function *F = dyn_cast(StrChr->stripPointerCasts())) CI->setCallingConv(F->getCallingConv()); return CI; } /// EmitStrNCmp - Emit a call to the strncmp function to the builder. Value *llvm::EmitStrNCmp(Value *Ptr1, Value *Ptr2, Value *Len, IRBuilder<> &B, const DataLayout *TD, const TargetLibraryInfo *TLI) { if (!TLI->has(LibFunc::strncmp)) return nullptr; Module *M = B.GetInsertBlock()->getParent()->getParent(); AttributeSet AS[3]; AS[0] = AttributeSet::get(M->getContext(), 1, Attribute::NoCapture); AS[1] = AttributeSet::get(M->getContext(), 2, Attribute::NoCapture); Attribute::AttrKind AVs[2] = { Attribute::ReadOnly, Attribute::NoUnwind }; AS[2] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, AVs); LLVMContext &Context = B.GetInsertBlock()->getContext(); Value *StrNCmp = M->getOrInsertFunction("strncmp", AttributeSet::get(M->getContext(), AS), B.getInt32Ty(), B.getInt8PtrTy(), B.getInt8PtrTy(), TD->getIntPtrType(Context), NULL); CallInst *CI = B.CreateCall3(StrNCmp, CastToCStr(Ptr1, B), CastToCStr(Ptr2, B), Len, "strncmp"); if (const Function *F = dyn_cast(StrNCmp->stripPointerCasts())) CI->setCallingConv(F->getCallingConv()); return CI; } /// EmitStrCpy - Emit a call to the strcpy function to the builder, for the /// specified pointer arguments. Value *llvm::EmitStrCpy(Value *Dst, Value *Src, IRBuilder<> &B, const DataLayout *TD, const TargetLibraryInfo *TLI, StringRef Name) { if (!TLI->has(LibFunc::strcpy)) return nullptr; Module *M = B.GetInsertBlock()->getParent()->getParent(); AttributeSet AS[2]; AS[0] = AttributeSet::get(M->getContext(), 2, Attribute::NoCapture); AS[1] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, Attribute::NoUnwind); Type *I8Ptr = B.getInt8PtrTy(); Value *StrCpy = M->getOrInsertFunction(Name, AttributeSet::get(M->getContext(), AS), I8Ptr, I8Ptr, I8Ptr, NULL); CallInst *CI = B.CreateCall2(StrCpy, CastToCStr(Dst, B), CastToCStr(Src, B), Name); if (const Function *F = dyn_cast(StrCpy->stripPointerCasts())) CI->setCallingConv(F->getCallingConv()); return CI; } /// EmitStrNCpy - Emit a call to the strncpy function to the builder, for the /// specified pointer arguments. Value *llvm::EmitStrNCpy(Value *Dst, Value *Src, Value *Len, IRBuilder<> &B, const DataLayout *TD, const TargetLibraryInfo *TLI, StringRef Name) { if (!TLI->has(LibFunc::strncpy)) return nullptr; Module *M = B.GetInsertBlock()->getParent()->getParent(); AttributeSet AS[2]; AS[0] = AttributeSet::get(M->getContext(), 2, Attribute::NoCapture); AS[1] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, Attribute::NoUnwind); Type *I8Ptr = B.getInt8PtrTy(); Value *StrNCpy = M->getOrInsertFunction(Name, AttributeSet::get(M->getContext(), AS), 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(StrNCpy->stripPointerCasts())) CI->setCallingConv(F->getCallingConv()); return CI; } /// EmitMemCpyChk - Emit a call to the __memcpy_chk function to the builder. /// This expects that the Len and ObjSize have type 'intptr_t' and Dst/Src /// are pointers. Value *llvm::EmitMemCpyChk(Value *Dst, Value *Src, Value *Len, Value *ObjSize, IRBuilder<> &B, const DataLayout *TD, const TargetLibraryInfo *TLI) { if (!TLI->has(LibFunc::memcpy_chk)) return nullptr; Module *M = B.GetInsertBlock()->getParent()->getParent(); AttributeSet AS; AS = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, Attribute::NoUnwind); LLVMContext &Context = B.GetInsertBlock()->getContext(); Value *MemCpy = M->getOrInsertFunction("__memcpy_chk", AttributeSet::get(M->getContext(), AS), B.getInt8PtrTy(), B.getInt8PtrTy(), B.getInt8PtrTy(), TD->getIntPtrType(Context), TD->getIntPtrType(Context), NULL); Dst = CastToCStr(Dst, B); Src = CastToCStr(Src, B); CallInst *CI = B.CreateCall4(MemCpy, Dst, Src, Len, ObjSize); if (const Function *F = dyn_cast(MemCpy->stripPointerCasts())) CI->setCallingConv(F->getCallingConv()); return CI; } /// EmitMemChr - Emit a call to the memchr function. This assumes that Ptr is /// a pointer, Val is an i32 value, and Len is an 'intptr_t' value. Value *llvm::EmitMemChr(Value *Ptr, Value *Val, Value *Len, IRBuilder<> &B, const DataLayout *TD, const TargetLibraryInfo *TLI) { if (!TLI->has(LibFunc::memchr)) return nullptr; Module *M = B.GetInsertBlock()->getParent()->getParent(); AttributeSet AS; Attribute::AttrKind AVs[2] = { Attribute::ReadOnly, Attribute::NoUnwind }; AS = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, AVs); LLVMContext &Context = B.GetInsertBlock()->getContext(); Value *MemChr = M->getOrInsertFunction("memchr", AttributeSet::get(M->getContext(), AS), B.getInt8PtrTy(), B.getInt8PtrTy(), B.getInt32Ty(), TD->getIntPtrType(Context), NULL); CallInst *CI = B.CreateCall3(MemChr, CastToCStr(Ptr, B), Val, Len, "memchr"); if (const Function *F = dyn_cast(MemChr->stripPointerCasts())) CI->setCallingConv(F->getCallingConv()); return CI; } /// EmitMemCmp - Emit a call to the memcmp function. Value *llvm::EmitMemCmp(Value *Ptr1, Value *Ptr2, Value *Len, IRBuilder<> &B, const DataLayout *TD, const TargetLibraryInfo *TLI) { if (!TLI->has(LibFunc::memcmp)) return nullptr; Module *M = B.GetInsertBlock()->getParent()->getParent(); AttributeSet AS[3]; AS[0] = AttributeSet::get(M->getContext(), 1, Attribute::NoCapture); AS[1] = AttributeSet::get(M->getContext(), 2, Attribute::NoCapture); Attribute::AttrKind AVs[2] = { Attribute::ReadOnly, Attribute::NoUnwind }; AS[2] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, AVs); LLVMContext &Context = B.GetInsertBlock()->getContext(); Value *MemCmp = M->getOrInsertFunction("memcmp", AttributeSet::get(M->getContext(), AS), B.getInt32Ty(), B.getInt8PtrTy(), B.getInt8PtrTy(), TD->getIntPtrType(Context), NULL); CallInst *CI = B.CreateCall3(MemCmp, CastToCStr(Ptr1, B), CastToCStr(Ptr2, B), Len, "memcmp"); if (const Function *F = dyn_cast(MemCmp->stripPointerCasts())) CI->setCallingConv(F->getCallingConv()); return CI; } /// Append a suffix to the function name according to the type of 'Op'. static void AppendTypeSuffix(Value *Op, StringRef &Name, SmallString<20> &NameBuffer) { if (!Op->getType()->isDoubleTy()) { NameBuffer += Name; if (Op->getType()->isFloatTy()) NameBuffer += 'f'; else NameBuffer += 'l'; Name = NameBuffer; } return; } /// EmitUnaryFloatFnCall - Emit a call to the unary function named 'Name' (e.g. /// 'floor'). This function is known to take a single of type matching 'Op' and /// returns one value with the same type. If 'Op' is a long double, 'l' is /// added as the suffix of name, if 'Op' is a float, we add a 'f' suffix. Value *llvm::EmitUnaryFloatFnCall(Value *Op, StringRef Name, IRBuilder<> &B, const AttributeSet &Attrs) { SmallString<20> NameBuffer; AppendTypeSuffix(Op, Name, NameBuffer); Module *M = B.GetInsertBlock()->getParent()->getParent(); Value *Callee = M->getOrInsertFunction(Name, Op->getType(), Op->getType(), NULL); CallInst *CI = B.CreateCall(Callee, Op, Name); CI->setAttributes(Attrs); if (const Function *F = dyn_cast(Callee->stripPointerCasts())) CI->setCallingConv(F->getCallingConv()); return CI; } /// EmitBinaryFloatFnCall - Emit a call to the binary function named 'Name' /// (e.g. 'fmin'). This function is known to take type matching 'Op1' and 'Op2' /// and return one value with the same type. If 'Op1/Op2' are long double, 'l' /// is added as the suffix of name, if 'Op1/Op2' is a float, we add a 'f' /// suffix. Value *llvm::EmitBinaryFloatFnCall(Value *Op1, Value *Op2, StringRef Name, IRBuilder<> &B, const AttributeSet &Attrs) { SmallString<20> NameBuffer; AppendTypeSuffix(Op1, Name, NameBuffer); Module *M = B.GetInsertBlock()->getParent()->getParent(); Value *Callee = M->getOrInsertFunction(Name, Op1->getType(), Op1->getType(), Op2->getType(), NULL); CallInst *CI = B.CreateCall2(Callee, Op1, Op2, Name); CI->setAttributes(Attrs); if (const Function *F = dyn_cast(Callee->stripPointerCasts())) CI->setCallingConv(F->getCallingConv()); return CI; } /// EmitPutChar - Emit a call to the putchar function. This assumes that Char /// is an integer. Value *llvm::EmitPutChar(Value *Char, IRBuilder<> &B, const DataLayout *TD, const TargetLibraryInfo *TLI) { if (!TLI->has(LibFunc::putchar)) return nullptr; Module *M = B.GetInsertBlock()->getParent()->getParent(); Value *PutChar = M->getOrInsertFunction("putchar", B.getInt32Ty(), B.getInt32Ty(), NULL); CallInst *CI = B.CreateCall(PutChar, B.CreateIntCast(Char, B.getInt32Ty(), /*isSigned*/true, "chari"), "putchar"); if (const Function *F = dyn_cast(PutChar->stripPointerCasts())) CI->setCallingConv(F->getCallingConv()); return CI; } /// EmitPutS - Emit a call to the puts function. This assumes that Str is /// some pointer. Value *llvm::EmitPutS(Value *Str, IRBuilder<> &B, const DataLayout *TD, const TargetLibraryInfo *TLI) { if (!TLI->has(LibFunc::puts)) return nullptr; Module *M = B.GetInsertBlock()->getParent()->getParent(); AttributeSet AS[2]; AS[0] = AttributeSet::get(M->getContext(), 1, Attribute::NoCapture); AS[1] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, Attribute::NoUnwind); Value *PutS = M->getOrInsertFunction("puts", AttributeSet::get(M->getContext(), AS), B.getInt32Ty(), B.getInt8PtrTy(), NULL); CallInst *CI = B.CreateCall(PutS, CastToCStr(Str, B), "puts"); if (const Function *F = dyn_cast(PutS->stripPointerCasts())) CI->setCallingConv(F->getCallingConv()); return CI; } /// EmitFPutC - Emit a call to the fputc function. This assumes that Char is /// an integer and File is a pointer to FILE. Value *llvm::EmitFPutC(Value *Char, Value *File, IRBuilder<> &B, const DataLayout *TD, const TargetLibraryInfo *TLI) { if (!TLI->has(LibFunc::fputc)) return nullptr; Module *M = B.GetInsertBlock()->getParent()->getParent(); AttributeSet AS[2]; AS[0] = AttributeSet::get(M->getContext(), 2, Attribute::NoCapture); AS[1] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, Attribute::NoUnwind); Constant *F; if (File->getType()->isPointerTy()) F = M->getOrInsertFunction("fputc", AttributeSet::get(M->getContext(), AS), B.getInt32Ty(), B.getInt32Ty(), File->getType(), NULL); else F = M->getOrInsertFunction("fputc", B.getInt32Ty(), B.getInt32Ty(), File->getType(), NULL); Char = B.CreateIntCast(Char, B.getInt32Ty(), /*isSigned*/true, "chari"); CallInst *CI = B.CreateCall2(F, Char, File, "fputc"); if (const Function *Fn = dyn_cast(F->stripPointerCasts())) CI->setCallingConv(Fn->getCallingConv()); return CI; } /// EmitFPutS - Emit a call to the puts function. Str is required to be a /// pointer and File is a pointer to FILE. Value *llvm::EmitFPutS(Value *Str, Value *File, IRBuilder<> &B, const DataLayout *TD, const TargetLibraryInfo *TLI) { if (!TLI->has(LibFunc::fputs)) return nullptr; Module *M = B.GetInsertBlock()->getParent()->getParent(); AttributeSet AS[3]; AS[0] = AttributeSet::get(M->getContext(), 1, Attribute::NoCapture); AS[1] = AttributeSet::get(M->getContext(), 2, Attribute::NoCapture); AS[2] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, Attribute::NoUnwind); StringRef FPutsName = TLI->getName(LibFunc::fputs); Constant *F; if (File->getType()->isPointerTy()) F = M->getOrInsertFunction(FPutsName, AttributeSet::get(M->getContext(), AS), B.getInt32Ty(), B.getInt8PtrTy(), File->getType(), NULL); else F = M->getOrInsertFunction(FPutsName, B.getInt32Ty(), B.getInt8PtrTy(), File->getType(), NULL); CallInst *CI = B.CreateCall2(F, CastToCStr(Str, B), File, "fputs"); if (const Function *Fn = dyn_cast(F->stripPointerCasts())) CI->setCallingConv(Fn->getCallingConv()); return CI; } /// EmitFWrite - Emit a call to the fwrite function. This assumes that Ptr is /// a pointer, Size is an 'intptr_t', and File is a pointer to FILE. Value *llvm::EmitFWrite(Value *Ptr, Value *Size, Value *File, IRBuilder<> &B, const DataLayout *TD, const TargetLibraryInfo *TLI) { if (!TLI->has(LibFunc::fwrite)) return nullptr; Module *M = B.GetInsertBlock()->getParent()->getParent(); AttributeSet AS[3]; AS[0] = AttributeSet::get(M->getContext(), 1, Attribute::NoCapture); AS[1] = AttributeSet::get(M->getContext(), 4, Attribute::NoCapture); AS[2] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, Attribute::NoUnwind); LLVMContext &Context = B.GetInsertBlock()->getContext(); StringRef FWriteName = TLI->getName(LibFunc::fwrite); Constant *F; if (File->getType()->isPointerTy()) F = M->getOrInsertFunction(FWriteName, AttributeSet::get(M->getContext(), AS), TD->getIntPtrType(Context), B.getInt8PtrTy(), TD->getIntPtrType(Context), TD->getIntPtrType(Context), File->getType(), NULL); else F = M->getOrInsertFunction(FWriteName, TD->getIntPtrType(Context), B.getInt8PtrTy(), TD->getIntPtrType(Context), TD->getIntPtrType(Context), File->getType(), NULL); CallInst *CI = B.CreateCall4(F, CastToCStr(Ptr, B), Size, ConstantInt::get(TD->getIntPtrType(Context), 1), File); if (const Function *Fn = dyn_cast(F->stripPointerCasts())) CI->setCallingConv(Fn->getCallingConv()); return CI; } SimplifyFortifiedLibCalls::~SimplifyFortifiedLibCalls() { } bool SimplifyFortifiedLibCalls::fold(CallInst *CI, const DataLayout *TD, const TargetLibraryInfo *TLI) { // We really need DataLayout for later. if (!TD) return false; this->CI = CI; Function *Callee = CI->getCalledFunction(); StringRef Name = Callee->getName(); FunctionType *FT = Callee->getFunctionType(); LLVMContext &Context = CI->getParent()->getContext(); IRBuilder<> B(CI); if (Name == "__memcpy_chk") { // Check if this has the right signature. if (FT->getNumParams() != 4 || FT->getReturnType() != FT->getParamType(0) || !FT->getParamType(0)->isPointerTy() || !FT->getParamType(1)->isPointerTy() || FT->getParamType(2) != TD->getIntPtrType(Context) || FT->getParamType(3) != TD->getIntPtrType(Context)) return false; if (isFoldable(3, 2, false)) { B.CreateMemCpy(CI->getArgOperand(0), CI->getArgOperand(1), CI->getArgOperand(2), 1); replaceCall(CI->getArgOperand(0)); return true; } return false; } // Should be similar to memcpy. if (Name == "__mempcpy_chk") { return false; } if (Name == "__memmove_chk") { // Check if this has the right signature. if (FT->getNumParams() != 4 || FT->getReturnType() != FT->getParamType(0) || !FT->getParamType(0)->isPointerTy() || !FT->getParamType(1)->isPointerTy() || FT->getParamType(2) != TD->getIntPtrType(Context) || FT->getParamType(3) != TD->getIntPtrType(Context)) return false; if (isFoldable(3, 2, false)) { B.CreateMemMove(CI->getArgOperand(0), CI->getArgOperand(1), CI->getArgOperand(2), 1); replaceCall(CI->getArgOperand(0)); return true; } return false; } if (Name == "__memset_chk") { // Check if this has the right signature. if (FT->getNumParams() != 4 || FT->getReturnType() != FT->getParamType(0) || !FT->getParamType(0)->isPointerTy() || !FT->getParamType(1)->isIntegerTy() || FT->getParamType(2) != TD->getIntPtrType(Context) || FT->getParamType(3) != TD->getIntPtrType(Context)) return false; if (isFoldable(3, 2, false)) { Value *Val = B.CreateIntCast(CI->getArgOperand(1), B.getInt8Ty(), false); B.CreateMemSet(CI->getArgOperand(0), Val, CI->getArgOperand(2), 1); replaceCall(CI->getArgOperand(0)); return true; } return false; } if (Name == "__strcpy_chk" || Name == "__stpcpy_chk") { // Check if this has the right signature. if (FT->getNumParams() != 3 || FT->getReturnType() != FT->getParamType(0) || FT->getParamType(0) != FT->getParamType(1) || FT->getParamType(0) != Type::getInt8PtrTy(Context) || FT->getParamType(2) != TD->getIntPtrType(Context)) return 0; // If a) we don't have any length information, or b) we know this will // fit then just lower to a plain st[rp]cpy. Otherwise we'll keep our // st[rp]cpy_chk call which may fail at runtime if the size is too long. // TODO: It might be nice to get a maximum length out of the possible // string lengths for varying. if (isFoldable(2, 1, true)) { Value *Ret = EmitStrCpy(CI->getArgOperand(0), CI->getArgOperand(1), B, TD, TLI, Name.substr(2, 6)); if (!Ret) return false; replaceCall(Ret); return true; } return false; } if (Name == "__strncpy_chk" || Name == "__stpncpy_chk") { // Check if this has the right signature. if (FT->getNumParams() != 4 || FT->getReturnType() != FT->getParamType(0) || FT->getParamType(0) != FT->getParamType(1) || FT->getParamType(0) != Type::getInt8PtrTy(Context) || !FT->getParamType(2)->isIntegerTy() || FT->getParamType(3) != TD->getIntPtrType(Context)) return false; if (isFoldable(3, 2, false)) { Value *Ret = EmitStrNCpy(CI->getArgOperand(0), CI->getArgOperand(1), CI->getArgOperand(2), B, TD, TLI, Name.substr(2, 7)); if (!Ret) return false; replaceCall(Ret); return true; } return false; } if (Name == "__strcat_chk") { return false; } if (Name == "__strncat_chk") { return false; } return false; }