llvm.org GIT mirror llvm / release_33 lib / Transforms / Utils / BuildLibCalls.cpp
release_33

Tree @release_33 (Download .tar.gz)

BuildLibCalls.cpp @release_33raw · history · blame

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
//===- 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) {
  return B.CreateBitCast(V, B.getInt8PtrTy(), "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 0;

  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,
                            ArrayRef<Attribute::AttrKind>(AVs, 2));

  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<Function>(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 0;

  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,
                            ArrayRef<Attribute::AttrKind>(AVs, 2));

  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<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.
Value *llvm::EmitStrChr(Value *Ptr, char C, IRBuilder<> &B,
                        const DataLayout *TD, const TargetLibraryInfo *TLI) {
  if (!TLI->has(LibFunc::strchr))
    return 0;

  Module *M = B.GetInsertBlock()->getParent()->getParent();
  Attribute::AttrKind AVs[2] = { Attribute::ReadOnly, Attribute::NoUnwind };
  AttributeSet AS =
    AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex,
                      ArrayRef<Attribute::AttrKind>(AVs, 2));

  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<Function>(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 0;

  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,
                            ArrayRef<Attribute::AttrKind>(AVs, 2));

  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<Function>(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 0;

  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<Function>(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 0;

  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<Function>(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 0;

  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<Function>(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 0;

  Module *M = B.GetInsertBlock()->getParent()->getParent();
  AttributeSet AS;
  Attribute::AttrKind AVs[2] = { Attribute::ReadOnly, Attribute::NoUnwind };
  AS = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex,
                         ArrayRef<Attribute::AttrKind>(AVs, 2));
  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<Function>(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 0;

  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,
                            ArrayRef<Attribute::AttrKind>(AVs, 2));

  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<Function>(MemCmp->stripPointerCasts()))
    CI->setCallingConv(F->getCallingConv());

  return CI;
}

/// 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;
  if (!Op->getType()->isDoubleTy()) {
    // If we need to add a suffix, copy into NameBuffer.
    NameBuffer += Name;
    if (Op->getType()->isFloatTy())
      NameBuffer += 'f'; // floorf
    else
      NameBuffer += 'l'; // floorl
    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<Function>(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 0;

  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<Function>(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 0;

  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<Function>(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 0;

  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<Function>(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 0;

  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<Function>(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 0;

  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<Function>(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;
}