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/ADT/SmallString.h" 16 #include "llvm/Analysis/TargetLibraryInfo.h" 17 #include "llvm/IR/Constants.h" 18 #include "llvm/IR/DataLayout.h" 19 #include "llvm/IR/Function.h" 20 #include "llvm/IR/IRBuilder.h" 21 #include "llvm/IR/Intrinsics.h" 22 #include "llvm/IR/LLVMContext.h" 23 #include "llvm/IR/Module.h" 24 #include "llvm/IR/Type.h" 25 26 using namespace llvm; 27 28 /// CastToCStr - Return V if it is an i8*, otherwise cast it to i8*. 29 Value *llvm::CastToCStr(Value *V, IRBuilder<> &B) { 30 unsigned AS = V->getType()->getPointerAddressSpace(); 31 return B.CreateBitCast(V, B.getInt8PtrTy(AS), "cstr"); 32 } 33 34 /// EmitStrLen - Emit a call to the strlen function to the builder, for the 35 /// specified pointer. This always returns an integer value of size intptr_t. 36 Value *llvm::EmitStrLen(Value *Ptr, IRBuilder<> &B, const DataLayout &DL, 37 const TargetLibraryInfo *TLI) { 38 if (!TLI->has(LibFunc::strlen)) 39 return nullptr; 40 41 Module *M = B.GetInsertBlock()->getParent()->getParent(); 42 AttributeSet AS[2]; 43 AS[0] = AttributeSet::get(M->getContext(), 1, Attribute::NoCapture); 44 Attribute::AttrKind AVs[2] = { Attribute::ReadOnly, Attribute::NoUnwind }; 45 AS[1] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, AVs); 46 47 LLVMContext &Context = B.GetInsertBlock()->getContext(); 48 Constant *StrLen = M->getOrInsertFunction( 49 "strlen", AttributeSet::get(M->getContext(), AS), 50 DL.getIntPtrType(Context), B.getInt8PtrTy(), nullptr); 51 CallInst *CI = B.CreateCall(StrLen, CastToCStr(Ptr, B), "strlen"); 52 if (const Function *F = dyn_cast<Function>(StrLen->stripPointerCasts())) 53 CI->setCallingConv(F->getCallingConv()); 54 55 return CI; 56 } 57 58 /// EmitStrChr - Emit a call to the strchr function to the builder, for the 59 /// specified pointer and character. Ptr is required to be some pointer type, 60 /// and the return value has 'i8*' type. 61 Value *llvm::EmitStrChr(Value *Ptr, char C, IRBuilder<> &B, 62 const TargetLibraryInfo *TLI) { 63 if (!TLI->has(LibFunc::strchr)) 64 return nullptr; 65 66 Module *M = B.GetInsertBlock()->getParent()->getParent(); 67 Attribute::AttrKind AVs[2] = { Attribute::ReadOnly, Attribute::NoUnwind }; 68 AttributeSet AS = 69 AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, AVs); 70 71 Type *I8Ptr = B.getInt8PtrTy(); 72 Type *I32Ty = B.getInt32Ty(); 73 Constant *StrChr = M->getOrInsertFunction("strchr", 74 AttributeSet::get(M->getContext(), 75 AS), 76 I8Ptr, I8Ptr, I32Ty, nullptr); 77 CallInst *CI = B.CreateCall( 78 StrChr, {CastToCStr(Ptr, B), ConstantInt::get(I32Ty, C)}, "strchr"); 79 if (const Function *F = dyn_cast<Function>(StrChr->stripPointerCasts())) 80 CI->setCallingConv(F->getCallingConv()); 81 return CI; 82 } 83 84 /// EmitStrNCmp - Emit a call to the strncmp function to the builder. 85 Value *llvm::EmitStrNCmp(Value *Ptr1, Value *Ptr2, Value *Len, IRBuilder<> &B, 86 const DataLayout &DL, const TargetLibraryInfo *TLI) { 87 if (!TLI->has(LibFunc::strncmp)) 88 return nullptr; 89 90 Module *M = B.GetInsertBlock()->getParent()->getParent(); 91 AttributeSet AS[3]; 92 AS[0] = AttributeSet::get(M->getContext(), 1, Attribute::NoCapture); 93 AS[1] = AttributeSet::get(M->getContext(), 2, Attribute::NoCapture); 94 Attribute::AttrKind AVs[2] = { Attribute::ReadOnly, Attribute::NoUnwind }; 95 AS[2] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, AVs); 96 97 LLVMContext &Context = B.GetInsertBlock()->getContext(); 98 Value *StrNCmp = M->getOrInsertFunction( 99 "strncmp", AttributeSet::get(M->getContext(), AS), B.getInt32Ty(), 100 B.getInt8PtrTy(), B.getInt8PtrTy(), DL.getIntPtrType(Context), nullptr); 101 CallInst *CI = B.CreateCall( 102 StrNCmp, {CastToCStr(Ptr1, B), CastToCStr(Ptr2, B), Len}, "strncmp"); 103 104 if (const Function *F = dyn_cast<Function>(StrNCmp->stripPointerCasts())) 105 CI->setCallingConv(F->getCallingConv()); 106 107 return CI; 108 } 109 110 /// EmitStrCpy - Emit a call to the strcpy function to the builder, for the 111 /// specified pointer arguments. 112 Value *llvm::EmitStrCpy(Value *Dst, Value *Src, IRBuilder<> &B, 113 const TargetLibraryInfo *TLI, StringRef Name) { 114 if (!TLI->has(LibFunc::strcpy)) 115 return nullptr; 116 117 Module *M = B.GetInsertBlock()->getParent()->getParent(); 118 AttributeSet AS[2]; 119 AS[0] = AttributeSet::get(M->getContext(), 2, Attribute::NoCapture); 120 AS[1] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, 121 Attribute::NoUnwind); 122 Type *I8Ptr = B.getInt8PtrTy(); 123 Value *StrCpy = M->getOrInsertFunction(Name, 124 AttributeSet::get(M->getContext(), AS), 125 I8Ptr, I8Ptr, I8Ptr, nullptr); 126 CallInst *CI = 127 B.CreateCall(StrCpy, {CastToCStr(Dst, B), CastToCStr(Src, B)}, Name); 128 if (const Function *F = dyn_cast<Function>(StrCpy->stripPointerCasts())) 129 CI->setCallingConv(F->getCallingConv()); 130 return CI; 131 } 132 133 /// EmitStrNCpy - Emit a call to the strncpy function to the builder, for the 134 /// specified pointer arguments. 135 Value *llvm::EmitStrNCpy(Value *Dst, Value *Src, Value *Len, IRBuilder<> &B, 136 const TargetLibraryInfo *TLI, StringRef Name) { 137 if (!TLI->has(LibFunc::strncpy)) 138 return nullptr; 139 140 Module *M = B.GetInsertBlock()->getParent()->getParent(); 141 AttributeSet AS[2]; 142 AS[0] = AttributeSet::get(M->getContext(), 2, Attribute::NoCapture); 143 AS[1] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, 144 Attribute::NoUnwind); 145 Type *I8Ptr = B.getInt8PtrTy(); 146 Value *StrNCpy = M->getOrInsertFunction(Name, 147 AttributeSet::get(M->getContext(), 148 AS), 149 I8Ptr, I8Ptr, I8Ptr, 150 Len->getType(), nullptr); 151 CallInst *CI = B.CreateCall( 152 StrNCpy, {CastToCStr(Dst, B), CastToCStr(Src, B), Len}, "strncpy"); 153 if (const Function *F = dyn_cast<Function>(StrNCpy->stripPointerCasts())) 154 CI->setCallingConv(F->getCallingConv()); 155 return CI; 156 } 157 158 /// EmitMemCpyChk - Emit a call to the __memcpy_chk function to the builder. 159 /// This expects that the Len and ObjSize have type 'intptr_t' and Dst/Src 160 /// are pointers. 161 Value *llvm::EmitMemCpyChk(Value *Dst, Value *Src, Value *Len, Value *ObjSize, 162 IRBuilder<> &B, const DataLayout &DL, 163 const TargetLibraryInfo *TLI) { 164 if (!TLI->has(LibFunc::memcpy_chk)) 165 return nullptr; 166 167 Module *M = B.GetInsertBlock()->getParent()->getParent(); 168 AttributeSet AS; 169 AS = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, 170 Attribute::NoUnwind); 171 LLVMContext &Context = B.GetInsertBlock()->getContext(); 172 Value *MemCpy = M->getOrInsertFunction( 173 "__memcpy_chk", AttributeSet::get(M->getContext(), AS), B.getInt8PtrTy(), 174 B.getInt8PtrTy(), B.getInt8PtrTy(), DL.getIntPtrType(Context), 175 DL.getIntPtrType(Context), nullptr); 176 Dst = CastToCStr(Dst, B); 177 Src = CastToCStr(Src, B); 178 CallInst *CI = B.CreateCall(MemCpy, {Dst, Src, Len, ObjSize}); 179 if (const Function *F = dyn_cast<Function>(MemCpy->stripPointerCasts())) 180 CI->setCallingConv(F->getCallingConv()); 181 return CI; 182 } 183 184 /// EmitMemChr - Emit a call to the memchr function. This assumes that Ptr is 185 /// a pointer, Val is an i32 value, and Len is an 'intptr_t' value. 186 Value *llvm::EmitMemChr(Value *Ptr, Value *Val, Value *Len, IRBuilder<> &B, 187 const DataLayout &DL, const TargetLibraryInfo *TLI) { 188 if (!TLI->has(LibFunc::memchr)) 189 return nullptr; 190 191 Module *M = B.GetInsertBlock()->getParent()->getParent(); 192 AttributeSet AS; 193 Attribute::AttrKind AVs[2] = { Attribute::ReadOnly, Attribute::NoUnwind }; 194 AS = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, AVs); 195 LLVMContext &Context = B.GetInsertBlock()->getContext(); 196 Value *MemChr = M->getOrInsertFunction( 197 "memchr", AttributeSet::get(M->getContext(), AS), B.getInt8PtrTy(), 198 B.getInt8PtrTy(), B.getInt32Ty(), DL.getIntPtrType(Context), nullptr); 199 CallInst *CI = B.CreateCall(MemChr, {CastToCStr(Ptr, B), Val, Len}, "memchr"); 200 201 if (const Function *F = dyn_cast<Function>(MemChr->stripPointerCasts())) 202 CI->setCallingConv(F->getCallingConv()); 203 204 return CI; 205 } 206 207 /// EmitMemCmp - Emit a call to the memcmp function. 208 Value *llvm::EmitMemCmp(Value *Ptr1, Value *Ptr2, Value *Len, IRBuilder<> &B, 209 const DataLayout &DL, const TargetLibraryInfo *TLI) { 210 if (!TLI->has(LibFunc::memcmp)) 211 return nullptr; 212 213 Module *M = B.GetInsertBlock()->getParent()->getParent(); 214 AttributeSet AS[3]; 215 AS[0] = AttributeSet::get(M->getContext(), 1, Attribute::NoCapture); 216 AS[1] = AttributeSet::get(M->getContext(), 2, Attribute::NoCapture); 217 Attribute::AttrKind AVs[2] = { Attribute::ReadOnly, Attribute::NoUnwind }; 218 AS[2] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, AVs); 219 220 LLVMContext &Context = B.GetInsertBlock()->getContext(); 221 Value *MemCmp = M->getOrInsertFunction( 222 "memcmp", AttributeSet::get(M->getContext(), AS), B.getInt32Ty(), 223 B.getInt8PtrTy(), B.getInt8PtrTy(), DL.getIntPtrType(Context), nullptr); 224 CallInst *CI = B.CreateCall( 225 MemCmp, {CastToCStr(Ptr1, B), CastToCStr(Ptr2, B), Len}, "memcmp"); 226 227 if (const Function *F = dyn_cast<Function>(MemCmp->stripPointerCasts())) 228 CI->setCallingConv(F->getCallingConv()); 229 230 return CI; 231 } 232 233 /// Append a suffix to the function name according to the type of 'Op'. 234 static void AppendTypeSuffix(Value *Op, StringRef &Name, SmallString<20> &NameBuffer) { 235 if (!Op->getType()->isDoubleTy()) { 236 NameBuffer += Name; 237 238 if (Op->getType()->isFloatTy()) 239 NameBuffer += 'f'; 240 else 241 NameBuffer += 'l'; 242 243 Name = NameBuffer; 244 } 245 return; 246 } 247 248 /// EmitUnaryFloatFnCall - Emit a call to the unary function named 'Name' (e.g. 249 /// 'floor'). This function is known to take a single of type matching 'Op' and 250 /// returns one value with the same type. If 'Op' is a long double, 'l' is 251 /// added as the suffix of name, if 'Op' is a float, we add a 'f' suffix. 252 Value *llvm::EmitUnaryFloatFnCall(Value *Op, StringRef Name, IRBuilder<> &B, 253 const AttributeSet &Attrs) { 254 SmallString<20> NameBuffer; 255 AppendTypeSuffix(Op, Name, NameBuffer); 256 257 Module *M = B.GetInsertBlock()->getParent()->getParent(); 258 Value *Callee = M->getOrInsertFunction(Name, Op->getType(), 259 Op->getType(), nullptr); 260 CallInst *CI = B.CreateCall(Callee, Op, Name); 261 CI->setAttributes(Attrs); 262 if (const Function *F = dyn_cast<Function>(Callee->stripPointerCasts())) 263 CI->setCallingConv(F->getCallingConv()); 264 265 return CI; 266 } 267 268 /// EmitBinaryFloatFnCall - Emit a call to the binary function named 'Name' 269 /// (e.g. 'fmin'). This function is known to take type matching 'Op1' and 'Op2' 270 /// and return one value with the same type. If 'Op1/Op2' are long double, 'l' 271 /// is added as the suffix of name, if 'Op1/Op2' is a float, we add a 'f' 272 /// suffix. 273 Value *llvm::EmitBinaryFloatFnCall(Value *Op1, Value *Op2, StringRef Name, 274 IRBuilder<> &B, const AttributeSet &Attrs) { 275 SmallString<20> NameBuffer; 276 AppendTypeSuffix(Op1, Name, NameBuffer); 277 278 Module *M = B.GetInsertBlock()->getParent()->getParent(); 279 Value *Callee = M->getOrInsertFunction(Name, Op1->getType(), 280 Op1->getType(), Op2->getType(), nullptr); 281 CallInst *CI = B.CreateCall(Callee, {Op1, Op2}, Name); 282 CI->setAttributes(Attrs); 283 if (const Function *F = dyn_cast<Function>(Callee->stripPointerCasts())) 284 CI->setCallingConv(F->getCallingConv()); 285 286 return CI; 287 } 288 289 /// EmitPutChar - Emit a call to the putchar function. This assumes that Char 290 /// is an integer. 291 Value *llvm::EmitPutChar(Value *Char, IRBuilder<> &B, 292 const TargetLibraryInfo *TLI) { 293 if (!TLI->has(LibFunc::putchar)) 294 return nullptr; 295 296 Module *M = B.GetInsertBlock()->getParent()->getParent(); 297 Value *PutChar = M->getOrInsertFunction("putchar", B.getInt32Ty(), 298 B.getInt32Ty(), nullptr); 299 CallInst *CI = B.CreateCall(PutChar, 300 B.CreateIntCast(Char, 301 B.getInt32Ty(), 302 /*isSigned*/true, 303 "chari"), 304 "putchar"); 305 306 if (const Function *F = dyn_cast<Function>(PutChar->stripPointerCasts())) 307 CI->setCallingConv(F->getCallingConv()); 308 return CI; 309 } 310 311 /// EmitPutS - Emit a call to the puts function. This assumes that Str is 312 /// some pointer. 313 Value *llvm::EmitPutS(Value *Str, IRBuilder<> &B, 314 const TargetLibraryInfo *TLI) { 315 if (!TLI->has(LibFunc::puts)) 316 return nullptr; 317 318 Module *M = B.GetInsertBlock()->getParent()->getParent(); 319 AttributeSet AS[2]; 320 AS[0] = AttributeSet::get(M->getContext(), 1, Attribute::NoCapture); 321 AS[1] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, 322 Attribute::NoUnwind); 323 324 Value *PutS = M->getOrInsertFunction("puts", 325 AttributeSet::get(M->getContext(), AS), 326 B.getInt32Ty(), 327 B.getInt8PtrTy(), 328 nullptr); 329 CallInst *CI = B.CreateCall(PutS, CastToCStr(Str, B), "puts"); 330 if (const Function *F = dyn_cast<Function>(PutS->stripPointerCasts())) 331 CI->setCallingConv(F->getCallingConv()); 332 return CI; 333 } 334 335 /// EmitFPutC - Emit a call to the fputc function. This assumes that Char is 336 /// an integer and File is a pointer to FILE. 337 Value *llvm::EmitFPutC(Value *Char, Value *File, IRBuilder<> &B, 338 const TargetLibraryInfo *TLI) { 339 if (!TLI->has(LibFunc::fputc)) 340 return nullptr; 341 342 Module *M = B.GetInsertBlock()->getParent()->getParent(); 343 AttributeSet AS[2]; 344 AS[0] = AttributeSet::get(M->getContext(), 2, Attribute::NoCapture); 345 AS[1] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, 346 Attribute::NoUnwind); 347 Constant *F; 348 if (File->getType()->isPointerTy()) 349 F = M->getOrInsertFunction("fputc", 350 AttributeSet::get(M->getContext(), AS), 351 B.getInt32Ty(), 352 B.getInt32Ty(), File->getType(), 353 nullptr); 354 else 355 F = M->getOrInsertFunction("fputc", 356 B.getInt32Ty(), 357 B.getInt32Ty(), 358 File->getType(), nullptr); 359 Char = B.CreateIntCast(Char, B.getInt32Ty(), /*isSigned*/true, 360 "chari"); 361 CallInst *CI = B.CreateCall(F, {Char, File}, "fputc"); 362 363 if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts())) 364 CI->setCallingConv(Fn->getCallingConv()); 365 return CI; 366 } 367 368 /// EmitFPutS - Emit a call to the puts function. Str is required to be a 369 /// pointer and File is a pointer to FILE. 370 Value *llvm::EmitFPutS(Value *Str, Value *File, IRBuilder<> &B, 371 const TargetLibraryInfo *TLI) { 372 if (!TLI->has(LibFunc::fputs)) 373 return nullptr; 374 375 Module *M = B.GetInsertBlock()->getParent()->getParent(); 376 AttributeSet AS[3]; 377 AS[0] = AttributeSet::get(M->getContext(), 1, Attribute::NoCapture); 378 AS[1] = AttributeSet::get(M->getContext(), 2, Attribute::NoCapture); 379 AS[2] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, 380 Attribute::NoUnwind); 381 StringRef FPutsName = TLI->getName(LibFunc::fputs); 382 Constant *F; 383 if (File->getType()->isPointerTy()) 384 F = M->getOrInsertFunction(FPutsName, 385 AttributeSet::get(M->getContext(), AS), 386 B.getInt32Ty(), 387 B.getInt8PtrTy(), 388 File->getType(), nullptr); 389 else 390 F = M->getOrInsertFunction(FPutsName, B.getInt32Ty(), 391 B.getInt8PtrTy(), 392 File->getType(), nullptr); 393 CallInst *CI = B.CreateCall(F, {CastToCStr(Str, B), File}, "fputs"); 394 395 if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts())) 396 CI->setCallingConv(Fn->getCallingConv()); 397 return CI; 398 } 399 400 /// EmitFWrite - Emit a call to the fwrite function. This assumes that Ptr is 401 /// a pointer, Size is an 'intptr_t', and File is a pointer to FILE. 402 Value *llvm::EmitFWrite(Value *Ptr, Value *Size, Value *File, IRBuilder<> &B, 403 const DataLayout &DL, const TargetLibraryInfo *TLI) { 404 if (!TLI->has(LibFunc::fwrite)) 405 return nullptr; 406 407 Module *M = B.GetInsertBlock()->getParent()->getParent(); 408 AttributeSet AS[3]; 409 AS[0] = AttributeSet::get(M->getContext(), 1, Attribute::NoCapture); 410 AS[1] = AttributeSet::get(M->getContext(), 4, Attribute::NoCapture); 411 AS[2] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, 412 Attribute::NoUnwind); 413 LLVMContext &Context = B.GetInsertBlock()->getContext(); 414 StringRef FWriteName = TLI->getName(LibFunc::fwrite); 415 Constant *F; 416 if (File->getType()->isPointerTy()) 417 F = M->getOrInsertFunction( 418 FWriteName, AttributeSet::get(M->getContext(), AS), 419 DL.getIntPtrType(Context), B.getInt8PtrTy(), DL.getIntPtrType(Context), 420 DL.getIntPtrType(Context), File->getType(), nullptr); 421 else 422 F = M->getOrInsertFunction(FWriteName, DL.getIntPtrType(Context), 423 B.getInt8PtrTy(), DL.getIntPtrType(Context), 424 DL.getIntPtrType(Context), File->getType(), 425 nullptr); 426 CallInst *CI = 427 B.CreateCall(F, {CastToCStr(Ptr, B), Size, 428 ConstantInt::get(DL.getIntPtrType(Context), 1), File}); 429 430 if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts())) 431 CI->setCallingConv(Fn->getCallingConv()); 432 return CI; 433 } 434
