BuildLibCalls.cpp revision bd973762003329c217eec2439071e9f93af3eea5
1fadc83c699d16e07747b1ceca7fbb01390fdcb74Chris Lattner//===- BuildLibCalls.cpp - Utility builder for libcalls -------------------===// 2fadc83c699d16e07747b1ceca7fbb01390fdcb74Chris Lattner// 3fadc83c699d16e07747b1ceca7fbb01390fdcb74Chris Lattner// The LLVM Compiler Infrastructure 4fadc83c699d16e07747b1ceca7fbb01390fdcb74Chris Lattner// 5fadc83c699d16e07747b1ceca7fbb01390fdcb74Chris Lattner// This file is distributed under the University of Illinois Open Source 6fadc83c699d16e07747b1ceca7fbb01390fdcb74Chris Lattner// License. See LICENSE.TXT for details. 7fadc83c699d16e07747b1ceca7fbb01390fdcb74Chris Lattner// 8fadc83c699d16e07747b1ceca7fbb01390fdcb74Chris Lattner//===----------------------------------------------------------------------===// 9fadc83c699d16e07747b1ceca7fbb01390fdcb74Chris Lattner// 10fadc83c699d16e07747b1ceca7fbb01390fdcb74Chris Lattner// This file implements some functions that will create standard C libcalls. 11fadc83c699d16e07747b1ceca7fbb01390fdcb74Chris Lattner// 12fadc83c699d16e07747b1ceca7fbb01390fdcb74Chris Lattner//===----------------------------------------------------------------------===// 13fadc83c699d16e07747b1ceca7fbb01390fdcb74Chris Lattner 14fadc83c699d16e07747b1ceca7fbb01390fdcb74Chris Lattner#include "llvm/Transforms/Utils/BuildLibCalls.h" 15fadc83c699d16e07747b1ceca7fbb01390fdcb74Chris Lattner#include "llvm/Type.h" 16fadc83c699d16e07747b1ceca7fbb01390fdcb74Chris Lattner#include "llvm/Constants.h" 17fadc83c699d16e07747b1ceca7fbb01390fdcb74Chris Lattner#include "llvm/Function.h" 18d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner#include "llvm/Module.h" 19fadc83c699d16e07747b1ceca7fbb01390fdcb74Chris Lattner#include "llvm/Support/IRBuilder.h" 20fadc83c699d16e07747b1ceca7fbb01390fdcb74Chris Lattner#include "llvm/Target/TargetData.h" 21d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner#include "llvm/LLVMContext.h" 22d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner#include "llvm/Intrinsics.h" 23d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner 24d5fb7906130989a579d1bfe4490b414331e94feeChris Lattnerusing namespace llvm; 25d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner 26d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner/// CastToCStr - Return V if it is an i8*, otherwise cast it to i8*. 27d5fb7906130989a579d1bfe4490b414331e94feeChris LattnerValue *llvm::CastToCStr(Value *V, IRBuilder<> &B) { 28d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner return B.CreateBitCast(V, B.getInt8PtrTy(), "cstr"); 29d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner} 30d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner 31d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner/// EmitStrLen - Emit a call to the strlen function to the builder, for the 32d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner/// specified pointer. This always returns an integer value of size intptr_t. 33d5fb7906130989a579d1bfe4490b414331e94feeChris LattnerValue *llvm::EmitStrLen(Value *Ptr, IRBuilder<> &B, const TargetData *TD) { 34d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner Module *M = B.GetInsertBlock()->getParent()->getParent(); 35d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner AttributeWithIndex AWI[2]; 36d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture); 37d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner AWI[1] = AttributeWithIndex::get(~0u, Attribute::ReadOnly | 38d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner Attribute::NoUnwind); 39d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner 40d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner LLVMContext &Context = B.GetInsertBlock()->getContext(); 41d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner Constant *StrLen = M->getOrInsertFunction("strlen", AttrListPtr::get(AWI, 2), 42d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner TD->getIntPtrType(Context), 43d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner B.getInt8PtrTy(), 44d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner NULL); 45d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner CallInst *CI = B.CreateCall(StrLen, CastToCStr(Ptr, B), "strlen"); 46d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner if (const Function *F = dyn_cast<Function>(StrLen->stripPointerCasts())) 47d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner CI->setCallingConv(F->getCallingConv()); 48d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner 49d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner return CI; 50d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner} 51d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner 52d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner/// EmitStrChr - Emit a call to the strchr function to the builder, for the 53d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner/// specified pointer and character. Ptr is required to be some pointer type, 54d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner/// and the return value has 'i8*' type. 55d5fb7906130989a579d1bfe4490b414331e94feeChris LattnerValue *llvm::EmitStrChr(Value *Ptr, char C, IRBuilder<> &B, 56d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner const TargetData *TD) { 57d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner Module *M = B.GetInsertBlock()->getParent()->getParent(); 58d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner AttributeWithIndex AWI = 59d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner AttributeWithIndex::get(~0u, Attribute::ReadOnly | Attribute::NoUnwind); 60d5fb7906130989a579d1bfe4490b414331e94feeChris Lattner 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) { 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("strcpy", AttrListPtr::get(AWI, 2), 82 I8Ptr, I8Ptr, I8Ptr, NULL); 83 CallInst *CI = B.CreateCall2(StrCpy, CastToCStr(Dst, B), CastToCStr(Src, B), 84 "strcpy"); 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 strcpy 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) { 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("strncpy", 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 the size has type 'intptr_t' and Dst/Src are pointers. 112Value *llvm::EmitMemCpy(Value *Dst, Value *Src, Value *Len, 113 unsigned Align, IRBuilder<> &B, const TargetData *TD) { 114 Module *M = B.GetInsertBlock()->getParent()->getParent(); 115 const Type *Ty = Len->getType(); 116 Value *MemCpy = Intrinsic::getDeclaration(M, Intrinsic::memcpy, &Ty, 1); 117 Dst = CastToCStr(Dst, B); 118 Src = CastToCStr(Src, B); 119 return B.CreateCall4(MemCpy, Dst, Src, Len, 120 ConstantInt::get(B.getInt32Ty(), Align)); 121} 122 123/// EmitMemMove - Emit a call to the memmove function to the builder. This 124/// always expects that the size has type 'intptr_t' and Dst/Src are pointers. 125Value *llvm::EmitMemMove(Value *Dst, Value *Src, Value *Len, 126 unsigned Align, IRBuilder<> &B, const TargetData *TD) { 127 Module *M = B.GetInsertBlock()->getParent()->getParent(); 128 LLVMContext &Context = B.GetInsertBlock()->getContext(); 129 const Type *Ty = TD->getIntPtrType(Context); 130 Value *MemMove = Intrinsic::getDeclaration(M, Intrinsic::memmove, &Ty, 1); 131 Dst = CastToCStr(Dst, B); 132 Src = CastToCStr(Src, B); 133 Value *A = ConstantInt::get(B.getInt32Ty(), Align); 134 return B.CreateCall4(MemMove, Dst, Src, Len, A); 135} 136 137/// EmitMemChr - Emit a call to the memchr function. This assumes that Ptr is 138/// a pointer, Val is an i32 value, and Len is an 'intptr_t' value. 139Value *llvm::EmitMemChr(Value *Ptr, Value *Val, 140 Value *Len, IRBuilder<> &B, const TargetData *TD) { 141 Module *M = B.GetInsertBlock()->getParent()->getParent(); 142 AttributeWithIndex AWI; 143 AWI = AttributeWithIndex::get(~0u, Attribute::ReadOnly | Attribute::NoUnwind); 144 LLVMContext &Context = B.GetInsertBlock()->getContext(); 145 Value *MemChr = M->getOrInsertFunction("memchr", AttrListPtr::get(&AWI, 1), 146 B.getInt8PtrTy(), 147 B.getInt8PtrTy(), 148 B.getInt32Ty(), 149 TD->getIntPtrType(Context), 150 NULL); 151 CallInst *CI = B.CreateCall3(MemChr, CastToCStr(Ptr, B), Val, Len, "memchr"); 152 153 if (const Function *F = dyn_cast<Function>(MemChr->stripPointerCasts())) 154 CI->setCallingConv(F->getCallingConv()); 155 156 return CI; 157} 158 159/// EmitMemCmp - Emit a call to the memcmp function. 160Value *llvm::EmitMemCmp(Value *Ptr1, Value *Ptr2, 161 Value *Len, IRBuilder<> &B, const TargetData *TD) { 162 Module *M = B.GetInsertBlock()->getParent()->getParent(); 163 AttributeWithIndex AWI[3]; 164 AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture); 165 AWI[1] = AttributeWithIndex::get(2, Attribute::NoCapture); 166 AWI[2] = AttributeWithIndex::get(~0u, Attribute::ReadOnly | 167 Attribute::NoUnwind); 168 169 LLVMContext &Context = B.GetInsertBlock()->getContext(); 170 Value *MemCmp = M->getOrInsertFunction("memcmp", AttrListPtr::get(AWI, 3), 171 B.getInt32Ty(), 172 B.getInt8PtrTy(), 173 B.getInt8PtrTy(), 174 TD->getIntPtrType(Context), NULL); 175 CallInst *CI = B.CreateCall3(MemCmp, CastToCStr(Ptr1, B), CastToCStr(Ptr2, B), 176 Len, "memcmp"); 177 178 if (const Function *F = dyn_cast<Function>(MemCmp->stripPointerCasts())) 179 CI->setCallingConv(F->getCallingConv()); 180 181 return CI; 182} 183 184/// EmitMemSet - Emit a call to the memset function 185Value *llvm::EmitMemSet(Value *Dst, Value *Val, 186 Value *Len, IRBuilder<> &B, const TargetData *TD) { 187 Module *M = B.GetInsertBlock()->getParent()->getParent(); 188 Intrinsic::ID IID = Intrinsic::memset; 189 const Type *Tys[1]; 190 Tys[0] = Len->getType(); 191 Value *MemSet = Intrinsic::getDeclaration(M, IID, Tys, 1); 192 Value *Align = ConstantInt::get(B.getInt32Ty(), 1); 193 return B.CreateCall4(MemSet, CastToCStr(Dst, B), Val, Len, Align); 194} 195 196/// EmitUnaryFloatFnCall - Emit a call to the unary function named 'Name' (e.g. 197/// 'floor'). This function is known to take a single of type matching 'Op' and 198/// returns one value with the same type. If 'Op' is a long double, 'l' is 199/// added as the suffix of name, if 'Op' is a float, we add a 'f' suffix. 200Value *llvm::EmitUnaryFloatFnCall(Value *Op, const char *Name, 201 IRBuilder<> &B, const AttrListPtr &Attrs) { 202 char NameBuffer[20]; 203 if (!Op->getType()->isDoubleTy()) { 204 // If we need to add a suffix, copy into NameBuffer. 205 unsigned NameLen = strlen(Name); 206 assert(NameLen < sizeof(NameBuffer)-2); 207 memcpy(NameBuffer, Name, NameLen); 208 if (Op->getType()->isFloatTy()) 209 NameBuffer[NameLen] = 'f'; // floorf 210 else 211 NameBuffer[NameLen] = 'l'; // floorl 212 NameBuffer[NameLen+1] = 0; 213 Name = NameBuffer; 214 } 215 216 Module *M = B.GetInsertBlock()->getParent()->getParent(); 217 Value *Callee = M->getOrInsertFunction(Name, Op->getType(), 218 Op->getType(), NULL); 219 CallInst *CI = B.CreateCall(Callee, Op, Name); 220 CI->setAttributes(Attrs); 221 if (const Function *F = dyn_cast<Function>(Callee->stripPointerCasts())) 222 CI->setCallingConv(F->getCallingConv()); 223 224 return CI; 225} 226 227/// EmitPutChar - Emit a call to the putchar function. This assumes that Char 228/// is an integer. 229Value *llvm::EmitPutChar(Value *Char, IRBuilder<> &B, const TargetData *TD) { 230 Module *M = B.GetInsertBlock()->getParent()->getParent(); 231 Value *PutChar = M->getOrInsertFunction("putchar", B.getInt32Ty(), 232 B.getInt32Ty(), NULL); 233 CallInst *CI = B.CreateCall(PutChar, 234 B.CreateIntCast(Char, 235 B.getInt32Ty(), 236 /*isSigned*/true, 237 "chari"), 238 "putchar"); 239 240 if (const Function *F = dyn_cast<Function>(PutChar->stripPointerCasts())) 241 CI->setCallingConv(F->getCallingConv()); 242 return CI; 243} 244 245/// EmitPutS - Emit a call to the puts function. This assumes that Str is 246/// some pointer. 247void llvm::EmitPutS(Value *Str, IRBuilder<> &B, const TargetData *TD) { 248 Module *M = B.GetInsertBlock()->getParent()->getParent(); 249 AttributeWithIndex AWI[2]; 250 AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture); 251 AWI[1] = AttributeWithIndex::get(~0u, Attribute::NoUnwind); 252 253 Value *PutS = M->getOrInsertFunction("puts", AttrListPtr::get(AWI, 2), 254 B.getInt32Ty(), 255 B.getInt8PtrTy(), 256 NULL); 257 CallInst *CI = B.CreateCall(PutS, CastToCStr(Str, B), "puts"); 258 if (const Function *F = dyn_cast<Function>(PutS->stripPointerCasts())) 259 CI->setCallingConv(F->getCallingConv()); 260 261} 262 263/// EmitFPutC - Emit a call to the fputc function. This assumes that Char is 264/// an integer and File is a pointer to FILE. 265void llvm::EmitFPutC(Value *Char, Value *File, IRBuilder<> &B, 266 const TargetData *TD) { 267 Module *M = B.GetInsertBlock()->getParent()->getParent(); 268 AttributeWithIndex AWI[2]; 269 AWI[0] = AttributeWithIndex::get(2, Attribute::NoCapture); 270 AWI[1] = AttributeWithIndex::get(~0u, Attribute::NoUnwind); 271 Constant *F; 272 if (File->getType()->isPointerTy()) 273 F = M->getOrInsertFunction("fputc", AttrListPtr::get(AWI, 2), 274 B.getInt32Ty(), 275 B.getInt32Ty(), File->getType(), 276 NULL); 277 else 278 F = M->getOrInsertFunction("fputc", 279 B.getInt32Ty(), 280 B.getInt32Ty(), 281 File->getType(), NULL); 282 Char = B.CreateIntCast(Char, B.getInt32Ty(), /*isSigned*/true, 283 "chari"); 284 CallInst *CI = B.CreateCall2(F, Char, File, "fputc"); 285 286 if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts())) 287 CI->setCallingConv(Fn->getCallingConv()); 288} 289 290/// EmitFPutS - Emit a call to the puts function. Str is required to be a 291/// pointer and File is a pointer to FILE. 292void llvm::EmitFPutS(Value *Str, Value *File, IRBuilder<> &B, 293 const TargetData *TD) { 294 Module *M = B.GetInsertBlock()->getParent()->getParent(); 295 AttributeWithIndex AWI[3]; 296 AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture); 297 AWI[1] = AttributeWithIndex::get(2, Attribute::NoCapture); 298 AWI[2] = AttributeWithIndex::get(~0u, Attribute::NoUnwind); 299 Constant *F; 300 if (File->getType()->isPointerTy()) 301 F = M->getOrInsertFunction("fputs", AttrListPtr::get(AWI, 3), 302 B.getInt32Ty(), 303 B.getInt8PtrTy(), 304 File->getType(), NULL); 305 else 306 F = M->getOrInsertFunction("fputs", B.getInt32Ty(), 307 B.getInt8PtrTy(), 308 File->getType(), NULL); 309 CallInst *CI = B.CreateCall2(F, CastToCStr(Str, B), File, "fputs"); 310 311 if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts())) 312 CI->setCallingConv(Fn->getCallingConv()); 313} 314 315/// EmitFWrite - Emit a call to the fwrite function. This assumes that Ptr is 316/// a pointer, Size is an 'intptr_t', and File is a pointer to FILE. 317void llvm::EmitFWrite(Value *Ptr, Value *Size, Value *File, 318 IRBuilder<> &B, const TargetData *TD) { 319 Module *M = B.GetInsertBlock()->getParent()->getParent(); 320 AttributeWithIndex AWI[3]; 321 AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture); 322 AWI[1] = AttributeWithIndex::get(4, Attribute::NoCapture); 323 AWI[2] = AttributeWithIndex::get(~0u, Attribute::NoUnwind); 324 LLVMContext &Context = B.GetInsertBlock()->getContext(); 325 Constant *F; 326 if (File->getType()->isPointerTy()) 327 F = M->getOrInsertFunction("fwrite", AttrListPtr::get(AWI, 3), 328 TD->getIntPtrType(Context), 329 B.getInt8PtrTy(), 330 TD->getIntPtrType(Context), 331 TD->getIntPtrType(Context), 332 File->getType(), NULL); 333 else 334 F = M->getOrInsertFunction("fwrite", TD->getIntPtrType(Context), 335 B.getInt8PtrTy(), 336 TD->getIntPtrType(Context), 337 TD->getIntPtrType(Context), 338 File->getType(), NULL); 339 CallInst *CI = B.CreateCall4(F, CastToCStr(Ptr, B), Size, 340 ConstantInt::get(TD->getIntPtrType(Context), 1), File); 341 342 if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts())) 343 CI->setCallingConv(Fn->getCallingConv()); 344} 345