BuildLibCalls.cpp revision 208954
1//===- BuildLibCalls.cpp - Utility builder for libcalls -------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements some functions that will create standard C libcalls. 11// 12//===----------------------------------------------------------------------===// 13 14#include "llvm/Transforms/Utils/BuildLibCalls.h" 15#include "llvm/Type.h" 16#include "llvm/Constants.h" 17#include "llvm/Function.h" 18#include "llvm/Module.h" 19#include "llvm/Support/IRBuilder.h" 20#include "llvm/Target/TargetData.h" 21#include "llvm/LLVMContext.h" 22#include "llvm/Intrinsics.h" 23 24using namespace llvm; 25 26/// CastToCStr - Return V if it is an i8*, otherwise cast it to i8*. 27Value *llvm::CastToCStr(Value *V, IRBuilder<> &B) { 28 return B.CreateBitCast(V, B.getInt8PtrTy(), "cstr"); 29} 30 31/// EmitStrLen - Emit a call to the strlen function to the builder, for the 32/// specified pointer. This always returns an integer value of size intptr_t. 33Value *llvm::EmitStrLen(Value *Ptr, IRBuilder<> &B, const TargetData *TD) { 34 Module *M = B.GetInsertBlock()->getParent()->getParent(); 35 AttributeWithIndex AWI[2]; 36 AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture); 37 AWI[1] = AttributeWithIndex::get(~0u, Attribute::ReadOnly | 38 Attribute::NoUnwind); 39 40 LLVMContext &Context = B.GetInsertBlock()->getContext(); 41 Constant *StrLen = M->getOrInsertFunction("strlen", AttrListPtr::get(AWI, 2), 42 TD->getIntPtrType(Context), 43 B.getInt8PtrTy(), 44 NULL); 45 CallInst *CI = B.CreateCall(StrLen, CastToCStr(Ptr, B), "strlen"); 46 if (const Function *F = dyn_cast<Function>(StrLen->stripPointerCasts())) 47 CI->setCallingConv(F->getCallingConv()); 48 49 return CI; 50} 51 52/// EmitStrChr - Emit a call to the strchr function to the builder, for the 53/// specified pointer and character. Ptr is required to be some pointer type, 54/// and the return value has 'i8*' type. 55Value *llvm::EmitStrChr(Value *Ptr, char C, IRBuilder<> &B, 56 const TargetData *TD) { 57 Module *M = B.GetInsertBlock()->getParent()->getParent(); 58 AttributeWithIndex AWI = 59 AttributeWithIndex::get(~0u, Attribute::ReadOnly | Attribute::NoUnwind); 60 61 const Type *I8Ptr = B.getInt8PtrTy(); 62 const Type *I32Ty = B.getInt32Ty(); 63 Constant *StrChr = M->getOrInsertFunction("strchr", AttrListPtr::get(&AWI, 1), 64 I8Ptr, I8Ptr, I32Ty, NULL); 65 CallInst *CI = B.CreateCall2(StrChr, CastToCStr(Ptr, B), 66 ConstantInt::get(I32Ty, C), "strchr"); 67 if (const Function *F = dyn_cast<Function>(StrChr->stripPointerCasts())) 68 CI->setCallingConv(F->getCallingConv()); 69 return CI; 70} 71 72/// EmitStrCpy - Emit a call to the strcpy function to the builder, for the 73/// specified pointer arguments. 74Value *llvm::EmitStrCpy(Value *Dst, Value *Src, IRBuilder<> &B, 75 const TargetData *TD, StringRef Name) { 76 Module *M = B.GetInsertBlock()->getParent()->getParent(); 77 AttributeWithIndex AWI[2]; 78 AWI[0] = AttributeWithIndex::get(2, Attribute::NoCapture); 79 AWI[1] = AttributeWithIndex::get(~0u, Attribute::NoUnwind); 80 const Type *I8Ptr = B.getInt8PtrTy(); 81 Value *StrCpy = M->getOrInsertFunction(Name, AttrListPtr::get(AWI, 2), 82 I8Ptr, I8Ptr, I8Ptr, NULL); 83 CallInst *CI = B.CreateCall2(StrCpy, CastToCStr(Dst, B), CastToCStr(Src, B), 84 Name); 85 if (const Function *F = dyn_cast<Function>(StrCpy->stripPointerCasts())) 86 CI->setCallingConv(F->getCallingConv()); 87 return CI; 88} 89 90/// EmitStrNCpy - Emit a call to the strncpy function to the builder, for the 91/// specified pointer arguments. 92Value *llvm::EmitStrNCpy(Value *Dst, Value *Src, Value *Len, 93 IRBuilder<> &B, const TargetData *TD, StringRef Name) { 94 Module *M = B.GetInsertBlock()->getParent()->getParent(); 95 AttributeWithIndex AWI[2]; 96 AWI[0] = AttributeWithIndex::get(2, Attribute::NoCapture); 97 AWI[1] = AttributeWithIndex::get(~0u, Attribute::NoUnwind); 98 const Type *I8Ptr = B.getInt8PtrTy(); 99 Value *StrNCpy = M->getOrInsertFunction(Name, AttrListPtr::get(AWI, 2), 100 I8Ptr, I8Ptr, I8Ptr, 101 Len->getType(), NULL); 102 CallInst *CI = B.CreateCall3(StrNCpy, CastToCStr(Dst, B), CastToCStr(Src, B), 103 Len, "strncpy"); 104 if (const Function *F = dyn_cast<Function>(StrNCpy->stripPointerCasts())) 105 CI->setCallingConv(F->getCallingConv()); 106 return CI; 107} 108 109 110/// EmitMemCpy - Emit a call to the memcpy function to the builder. This always 111/// expects that Len has type 'intptr_t' and Dst/Src are pointers. 112Value *llvm::EmitMemCpy(Value *Dst, Value *Src, Value *Len, unsigned Align, 113 bool isVolatile, IRBuilder<> &B, const TargetData *TD) { 114 Module *M = B.GetInsertBlock()->getParent()->getParent(); 115 const Type *ArgTys[3] = { Dst->getType(), Src->getType(), Len->getType() }; 116 Value *MemCpy = Intrinsic::getDeclaration(M, Intrinsic::memcpy, ArgTys, 3); 117 Dst = CastToCStr(Dst, B); 118 Src = CastToCStr(Src, B); 119 return B.CreateCall5(MemCpy, Dst, Src, Len, 120 ConstantInt::get(B.getInt32Ty(), Align), 121 ConstantInt::get(B.getInt1Ty(), isVolatile)); 122} 123 124/// EmitMemCpyChk - Emit a call to the __memcpy_chk function to the builder. 125/// This expects that the Len and ObjSize have type 'intptr_t' and Dst/Src 126/// are pointers. 127Value *llvm::EmitMemCpyChk(Value *Dst, Value *Src, Value *Len, Value *ObjSize, 128 IRBuilder<> &B, const TargetData *TD) { 129 Module *M = B.GetInsertBlock()->getParent()->getParent(); 130 AttributeWithIndex AWI; 131 AWI = AttributeWithIndex::get(~0u, Attribute::NoUnwind); 132 LLVMContext &Context = B.GetInsertBlock()->getContext(); 133 Value *MemCpy = M->getOrInsertFunction("__memcpy_chk", 134 AttrListPtr::get(&AWI, 1), 135 B.getInt8PtrTy(), 136 B.getInt8PtrTy(), 137 B.getInt8PtrTy(), 138 TD->getIntPtrType(Context), 139 TD->getIntPtrType(Context), NULL); 140 Dst = CastToCStr(Dst, B); 141 Src = CastToCStr(Src, B); 142 CallInst *CI = B.CreateCall4(MemCpy, Dst, Src, Len, ObjSize); 143 if (const Function *F = dyn_cast<Function>(MemCpy->stripPointerCasts())) 144 CI->setCallingConv(F->getCallingConv()); 145 return CI; 146} 147 148/// EmitMemMove - Emit a call to the memmove function to the builder. This 149/// always expects that the size has type 'intptr_t' and Dst/Src are pointers. 150Value *llvm::EmitMemMove(Value *Dst, Value *Src, Value *Len, unsigned Align, 151 bool isVolatile, IRBuilder<> &B, const TargetData *TD) { 152 Module *M = B.GetInsertBlock()->getParent()->getParent(); 153 LLVMContext &Context = B.GetInsertBlock()->getContext(); 154 const Type *ArgTys[3] = { Dst->getType(), Src->getType(), 155 TD->getIntPtrType(Context) }; 156 Value *MemMove = Intrinsic::getDeclaration(M, Intrinsic::memmove, ArgTys, 3); 157 Dst = CastToCStr(Dst, B); 158 Src = CastToCStr(Src, B); 159 Value *A = ConstantInt::get(B.getInt32Ty(), Align); 160 Value *Vol = ConstantInt::get(B.getInt1Ty(), isVolatile); 161 return B.CreateCall5(MemMove, Dst, Src, Len, A, Vol); 162} 163 164/// EmitMemChr - Emit a call to the memchr function. This assumes that Ptr is 165/// a pointer, Val is an i32 value, and Len is an 'intptr_t' value. 166Value *llvm::EmitMemChr(Value *Ptr, Value *Val, 167 Value *Len, IRBuilder<> &B, const TargetData *TD) { 168 Module *M = B.GetInsertBlock()->getParent()->getParent(); 169 AttributeWithIndex AWI; 170 AWI = AttributeWithIndex::get(~0u, Attribute::ReadOnly | Attribute::NoUnwind); 171 LLVMContext &Context = B.GetInsertBlock()->getContext(); 172 Value *MemChr = M->getOrInsertFunction("memchr", AttrListPtr::get(&AWI, 1), 173 B.getInt8PtrTy(), 174 B.getInt8PtrTy(), 175 B.getInt32Ty(), 176 TD->getIntPtrType(Context), 177 NULL); 178 CallInst *CI = B.CreateCall3(MemChr, CastToCStr(Ptr, B), Val, Len, "memchr"); 179 180 if (const Function *F = dyn_cast<Function>(MemChr->stripPointerCasts())) 181 CI->setCallingConv(F->getCallingConv()); 182 183 return CI; 184} 185 186/// EmitMemCmp - Emit a call to the memcmp function. 187Value *llvm::EmitMemCmp(Value *Ptr1, Value *Ptr2, 188 Value *Len, IRBuilder<> &B, const TargetData *TD) { 189 Module *M = B.GetInsertBlock()->getParent()->getParent(); 190 AttributeWithIndex AWI[3]; 191 AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture); 192 AWI[1] = AttributeWithIndex::get(2, Attribute::NoCapture); 193 AWI[2] = AttributeWithIndex::get(~0u, Attribute::ReadOnly | 194 Attribute::NoUnwind); 195 196 LLVMContext &Context = B.GetInsertBlock()->getContext(); 197 Value *MemCmp = M->getOrInsertFunction("memcmp", AttrListPtr::get(AWI, 3), 198 B.getInt32Ty(), 199 B.getInt8PtrTy(), 200 B.getInt8PtrTy(), 201 TD->getIntPtrType(Context), NULL); 202 CallInst *CI = B.CreateCall3(MemCmp, CastToCStr(Ptr1, B), CastToCStr(Ptr2, B), 203 Len, "memcmp"); 204 205 if (const Function *F = dyn_cast<Function>(MemCmp->stripPointerCasts())) 206 CI->setCallingConv(F->getCallingConv()); 207 208 return CI; 209} 210 211/// EmitMemSet - Emit a call to the memset function 212Value *llvm::EmitMemSet(Value *Dst, Value *Val, Value *Len, bool isVolatile, 213 IRBuilder<> &B, const TargetData *TD) { 214 Module *M = B.GetInsertBlock()->getParent()->getParent(); 215 Intrinsic::ID IID = Intrinsic::memset; 216 const Type *Tys[2] = { Dst->getType(), Len->getType() }; 217 Value *MemSet = Intrinsic::getDeclaration(M, IID, Tys, 2); 218 Value *Align = ConstantInt::get(B.getInt32Ty(), 1); 219 Value *Vol = ConstantInt::get(B.getInt1Ty(), isVolatile); 220 return B.CreateCall5(MemSet, CastToCStr(Dst, B), Val, Len, Align, Vol); 221} 222 223/// EmitUnaryFloatFnCall - Emit a call to the unary function named 'Name' (e.g. 224/// 'floor'). This function is known to take a single of type matching 'Op' and 225/// returns one value with the same type. If 'Op' is a long double, 'l' is 226/// added as the suffix of name, if 'Op' is a float, we add a 'f' suffix. 227Value *llvm::EmitUnaryFloatFnCall(Value *Op, const char *Name, 228 IRBuilder<> &B, const AttrListPtr &Attrs) { 229 char NameBuffer[20]; 230 if (!Op->getType()->isDoubleTy()) { 231 // If we need to add a suffix, copy into NameBuffer. 232 unsigned NameLen = strlen(Name); 233 assert(NameLen < sizeof(NameBuffer)-2); 234 memcpy(NameBuffer, Name, NameLen); 235 if (Op->getType()->isFloatTy()) 236 NameBuffer[NameLen] = 'f'; // floorf 237 else 238 NameBuffer[NameLen] = 'l'; // floorl 239 NameBuffer[NameLen+1] = 0; 240 Name = NameBuffer; 241 } 242 243 Module *M = B.GetInsertBlock()->getParent()->getParent(); 244 Value *Callee = M->getOrInsertFunction(Name, Op->getType(), 245 Op->getType(), NULL); 246 CallInst *CI = B.CreateCall(Callee, Op, Name); 247 CI->setAttributes(Attrs); 248 if (const Function *F = dyn_cast<Function>(Callee->stripPointerCasts())) 249 CI->setCallingConv(F->getCallingConv()); 250 251 return CI; 252} 253 254/// EmitPutChar - Emit a call to the putchar function. This assumes that Char 255/// is an integer. 256Value *llvm::EmitPutChar(Value *Char, IRBuilder<> &B, const TargetData *TD) { 257 Module *M = B.GetInsertBlock()->getParent()->getParent(); 258 Value *PutChar = M->getOrInsertFunction("putchar", B.getInt32Ty(), 259 B.getInt32Ty(), NULL); 260 CallInst *CI = B.CreateCall(PutChar, 261 B.CreateIntCast(Char, 262 B.getInt32Ty(), 263 /*isSigned*/true, 264 "chari"), 265 "putchar"); 266 267 if (const Function *F = dyn_cast<Function>(PutChar->stripPointerCasts())) 268 CI->setCallingConv(F->getCallingConv()); 269 return CI; 270} 271 272/// EmitPutS - Emit a call to the puts function. This assumes that Str is 273/// some pointer. 274void llvm::EmitPutS(Value *Str, IRBuilder<> &B, const TargetData *TD) { 275 Module *M = B.GetInsertBlock()->getParent()->getParent(); 276 AttributeWithIndex AWI[2]; 277 AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture); 278 AWI[1] = AttributeWithIndex::get(~0u, Attribute::NoUnwind); 279 280 Value *PutS = M->getOrInsertFunction("puts", AttrListPtr::get(AWI, 2), 281 B.getInt32Ty(), 282 B.getInt8PtrTy(), 283 NULL); 284 CallInst *CI = B.CreateCall(PutS, CastToCStr(Str, B), "puts"); 285 if (const Function *F = dyn_cast<Function>(PutS->stripPointerCasts())) 286 CI->setCallingConv(F->getCallingConv()); 287 288} 289 290/// EmitFPutC - Emit a call to the fputc function. This assumes that Char is 291/// an integer and File is a pointer to FILE. 292void llvm::EmitFPutC(Value *Char, Value *File, IRBuilder<> &B, 293 const TargetData *TD) { 294 Module *M = B.GetInsertBlock()->getParent()->getParent(); 295 AttributeWithIndex AWI[2]; 296 AWI[0] = AttributeWithIndex::get(2, Attribute::NoCapture); 297 AWI[1] = AttributeWithIndex::get(~0u, Attribute::NoUnwind); 298 Constant *F; 299 if (File->getType()->isPointerTy()) 300 F = M->getOrInsertFunction("fputc", AttrListPtr::get(AWI, 2), 301 B.getInt32Ty(), 302 B.getInt32Ty(), File->getType(), 303 NULL); 304 else 305 F = M->getOrInsertFunction("fputc", 306 B.getInt32Ty(), 307 B.getInt32Ty(), 308 File->getType(), NULL); 309 Char = B.CreateIntCast(Char, B.getInt32Ty(), /*isSigned*/true, 310 "chari"); 311 CallInst *CI = B.CreateCall2(F, Char, File, "fputc"); 312 313 if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts())) 314 CI->setCallingConv(Fn->getCallingConv()); 315} 316 317/// EmitFPutS - Emit a call to the puts function. Str is required to be a 318/// pointer and File is a pointer to FILE. 319void llvm::EmitFPutS(Value *Str, Value *File, IRBuilder<> &B, 320 const TargetData *TD) { 321 Module *M = B.GetInsertBlock()->getParent()->getParent(); 322 AttributeWithIndex AWI[3]; 323 AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture); 324 AWI[1] = AttributeWithIndex::get(2, Attribute::NoCapture); 325 AWI[2] = AttributeWithIndex::get(~0u, Attribute::NoUnwind); 326 Constant *F; 327 if (File->getType()->isPointerTy()) 328 F = M->getOrInsertFunction("fputs", AttrListPtr::get(AWI, 3), 329 B.getInt32Ty(), 330 B.getInt8PtrTy(), 331 File->getType(), NULL); 332 else 333 F = M->getOrInsertFunction("fputs", B.getInt32Ty(), 334 B.getInt8PtrTy(), 335 File->getType(), NULL); 336 CallInst *CI = B.CreateCall2(F, CastToCStr(Str, B), File, "fputs"); 337 338 if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts())) 339 CI->setCallingConv(Fn->getCallingConv()); 340} 341 342/// EmitFWrite - Emit a call to the fwrite function. This assumes that Ptr is 343/// a pointer, Size is an 'intptr_t', and File is a pointer to FILE. 344void llvm::EmitFWrite(Value *Ptr, Value *Size, Value *File, 345 IRBuilder<> &B, const TargetData *TD) { 346 Module *M = B.GetInsertBlock()->getParent()->getParent(); 347 AttributeWithIndex AWI[3]; 348 AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture); 349 AWI[1] = AttributeWithIndex::get(4, Attribute::NoCapture); 350 AWI[2] = AttributeWithIndex::get(~0u, Attribute::NoUnwind); 351 LLVMContext &Context = B.GetInsertBlock()->getContext(); 352 Constant *F; 353 if (File->getType()->isPointerTy()) 354 F = M->getOrInsertFunction("fwrite", AttrListPtr::get(AWI, 3), 355 TD->getIntPtrType(Context), 356 B.getInt8PtrTy(), 357 TD->getIntPtrType(Context), 358 TD->getIntPtrType(Context), 359 File->getType(), NULL); 360 else 361 F = M->getOrInsertFunction("fwrite", TD->getIntPtrType(Context), 362 B.getInt8PtrTy(), 363 TD->getIntPtrType(Context), 364 TD->getIntPtrType(Context), 365 File->getType(), NULL); 366 CallInst *CI = B.CreateCall4(F, CastToCStr(Ptr, B), Size, 367 ConstantInt::get(TD->getIntPtrType(Context), 1), File); 368 369 if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts())) 370 CI->setCallingConv(Fn->getCallingConv()); 371} 372 373SimplifyFortifiedLibCalls::~SimplifyFortifiedLibCalls() { } 374 375bool SimplifyFortifiedLibCalls::fold(CallInst *CI, const TargetData *TD) { 376 // We really need TargetData for later. 377 if (!TD) return false; 378 379 this->CI = CI; 380 Function *Callee = CI->getCalledFunction(); 381 StringRef Name = Callee->getName(); 382 const FunctionType *FT = Callee->getFunctionType(); 383 BasicBlock *BB = CI->getParent(); 384 LLVMContext &Context = CI->getParent()->getContext(); 385 IRBuilder<> B(Context); 386 387 // Set the builder to the instruction after the call. 388 B.SetInsertPoint(BB, CI); 389 390 if (Name == "__memcpy_chk") { 391 // Check if this has the right signature. 392 if (FT->getNumParams() != 4 || FT->getReturnType() != FT->getParamType(0) || 393 !FT->getParamType(0)->isPointerTy() || 394 !FT->getParamType(1)->isPointerTy() || 395 FT->getParamType(2) != TD->getIntPtrType(Context) || 396 FT->getParamType(3) != TD->getIntPtrType(Context)) 397 return false; 398 399 if (isFoldable(4, 3, false)) { 400 EmitMemCpy(CI->getOperand(1), CI->getOperand(2), CI->getOperand(3), 401 1, false, B, TD); 402 replaceCall(CI->getOperand(1)); 403 return true; 404 } 405 return false; 406 } 407 408 // Should be similar to memcpy. 409 if (Name == "__mempcpy_chk") { 410 return false; 411 } 412 413 if (Name == "__memmove_chk") { 414 // Check if this has the right signature. 415 if (FT->getNumParams() != 4 || FT->getReturnType() != FT->getParamType(0) || 416 !FT->getParamType(0)->isPointerTy() || 417 !FT->getParamType(1)->isPointerTy() || 418 FT->getParamType(2) != TD->getIntPtrType(Context) || 419 FT->getParamType(3) != TD->getIntPtrType(Context)) 420 return false; 421 422 if (isFoldable(4, 3, false)) { 423 EmitMemMove(CI->getOperand(1), CI->getOperand(2), CI->getOperand(3), 424 1, false, B, TD); 425 replaceCall(CI->getOperand(1)); 426 return true; 427 } 428 return false; 429 } 430 431 if (Name == "__memset_chk") { 432 // Check if this has the right signature. 433 if (FT->getNumParams() != 4 || FT->getReturnType() != FT->getParamType(0) || 434 !FT->getParamType(0)->isPointerTy() || 435 !FT->getParamType(1)->isIntegerTy() || 436 FT->getParamType(2) != TD->getIntPtrType(Context) || 437 FT->getParamType(3) != TD->getIntPtrType(Context)) 438 return false; 439 440 if (isFoldable(4, 3, false)) { 441 Value *Val = B.CreateIntCast(CI->getOperand(2), B.getInt8Ty(), 442 false); 443 EmitMemSet(CI->getOperand(1), Val, CI->getOperand(3), false, B, TD); 444 replaceCall(CI->getOperand(1)); 445 return true; 446 } 447 return false; 448 } 449 450 if (Name == "__strcpy_chk" || Name == "__stpcpy_chk") { 451 // Check if this has the right signature. 452 if (FT->getNumParams() != 3 || 453 FT->getReturnType() != FT->getParamType(0) || 454 FT->getParamType(0) != FT->getParamType(1) || 455 FT->getParamType(0) != Type::getInt8PtrTy(Context) || 456 FT->getParamType(2) != TD->getIntPtrType(Context)) 457 return 0; 458 459 460 // If a) we don't have any length information, or b) we know this will 461 // fit then just lower to a plain st[rp]cpy. Otherwise we'll keep our 462 // st[rp]cpy_chk call which may fail at runtime if the size is too long. 463 // TODO: It might be nice to get a maximum length out of the possible 464 // string lengths for varying. 465 if (isFoldable(3, 2, true)) { 466 Value *Ret = EmitStrCpy(CI->getOperand(1), CI->getOperand(2), B, TD, 467 Name.substr(2, 6)); 468 replaceCall(Ret); 469 return true; 470 } 471 return false; 472 } 473 474 if (Name == "__strncpy_chk" || Name == "__stpncpy_chk") { 475 // Check if this has the right signature. 476 if (FT->getNumParams() != 4 || FT->getReturnType() != FT->getParamType(0) || 477 FT->getParamType(0) != FT->getParamType(1) || 478 FT->getParamType(0) != Type::getInt8PtrTy(Context) || 479 !FT->getParamType(2)->isIntegerTy() || 480 FT->getParamType(3) != TD->getIntPtrType(Context)) 481 return false; 482 483 if (isFoldable(4, 3, false)) { 484 Value *Ret = EmitStrNCpy(CI->getOperand(1), CI->getOperand(2), 485 CI->getOperand(3), B, TD, Name.substr(2, 7)); 486 replaceCall(Ret); 487 return true; 488 } 489 return false; 490 } 491 492 if (Name == "__strcat_chk") { 493 return false; 494 } 495 496 if (Name == "__strncat_chk") { 497 return false; 498 } 499 500 return false; 501} 502