1 //===- BuildLibCalls.cpp - Utility builder for libcalls -------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements some functions that will create standard C libcalls.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "llvm/Transforms/Utils/BuildLibCalls.h"
14 #include "llvm/ADT/SmallString.h"
15 #include "llvm/ADT/Statistic.h"
16 #include "llvm/Analysis/MemoryBuiltins.h"
17 #include "llvm/Analysis/TargetLibraryInfo.h"
18 #include "llvm/IR/Argument.h"
19 #include "llvm/IR/CallingConv.h"
20 #include "llvm/IR/Constants.h"
21 #include "llvm/IR/DataLayout.h"
22 #include "llvm/IR/Function.h"
23 #include "llvm/IR/IRBuilder.h"
24 #include "llvm/IR/Module.h"
25 #include "llvm/IR/Type.h"
26 #include "llvm/Support/TypeSize.h"
27 
28 using namespace llvm;
29 
30 #define DEBUG_TYPE "build-libcalls"
31 
32 //- Infer Attributes ---------------------------------------------------------//
33 
34 STATISTIC(NumReadNone, "Number of functions inferred as readnone");
35 STATISTIC(NumInaccessibleMemOnly,
36           "Number of functions inferred as inaccessiblememonly");
37 STATISTIC(NumReadOnly, "Number of functions inferred as readonly");
38 STATISTIC(NumWriteOnly, "Number of functions inferred as writeonly");
39 STATISTIC(NumArgMemOnly, "Number of functions inferred as argmemonly");
40 STATISTIC(NumInaccessibleMemOrArgMemOnly,
41           "Number of functions inferred as inaccessiblemem_or_argmemonly");
42 STATISTIC(NumNoUnwind, "Number of functions inferred as nounwind");
43 STATISTIC(NumNoCapture, "Number of arguments inferred as nocapture");
44 STATISTIC(NumWriteOnlyArg, "Number of arguments inferred as writeonly");
45 STATISTIC(NumReadOnlyArg, "Number of arguments inferred as readonly");
46 STATISTIC(NumNoAlias, "Number of function returns inferred as noalias");
47 STATISTIC(NumNoUndef, "Number of function returns inferred as noundef returns");
48 STATISTIC(NumReturnedArg, "Number of arguments inferred as returned");
49 STATISTIC(NumWillReturn, "Number of functions inferred as willreturn");
50 
51 static bool setDoesNotAccessMemory(Function &F) {
52   if (F.doesNotAccessMemory())
53     return false;
54   F.setDoesNotAccessMemory();
55   ++NumReadNone;
56   return true;
57 }
58 
59 static bool setOnlyAccessesInaccessibleMemory(Function &F) {
60   if (F.onlyAccessesInaccessibleMemory())
61     return false;
62   F.setOnlyAccessesInaccessibleMemory();
63   ++NumInaccessibleMemOnly;
64   return true;
65 }
66 
67 static bool setOnlyReadsMemory(Function &F) {
68   if (F.onlyReadsMemory())
69     return false;
70   F.setOnlyReadsMemory();
71   ++NumReadOnly;
72   return true;
73 }
74 
75 static bool setOnlyWritesMemory(Function &F) {
76   if (F.onlyWritesMemory()) // writeonly or readnone
77     return false;
78   // Turn readonly and writeonly into readnone.
79   if (F.hasFnAttribute(Attribute::ReadOnly)) {
80     F.removeFnAttr(Attribute::ReadOnly);
81     return setDoesNotAccessMemory(F);
82   }
83   ++NumWriteOnly;
84   F.setOnlyWritesMemory();
85   return true;
86 }
87 
88 static bool setOnlyAccessesArgMemory(Function &F) {
89   if (F.onlyAccessesArgMemory())
90     return false;
91   F.setOnlyAccessesArgMemory();
92   ++NumArgMemOnly;
93   return true;
94 }
95 
96 static bool setOnlyAccessesInaccessibleMemOrArgMem(Function &F) {
97   if (F.onlyAccessesInaccessibleMemOrArgMem())
98     return false;
99   F.setOnlyAccessesInaccessibleMemOrArgMem();
100   ++NumInaccessibleMemOrArgMemOnly;
101   return true;
102 }
103 
104 static bool setDoesNotThrow(Function &F) {
105   if (F.doesNotThrow())
106     return false;
107   F.setDoesNotThrow();
108   ++NumNoUnwind;
109   return true;
110 }
111 
112 static bool setRetDoesNotAlias(Function &F) {
113   if (F.hasRetAttribute(Attribute::NoAlias))
114     return false;
115   F.addRetAttr(Attribute::NoAlias);
116   ++NumNoAlias;
117   return true;
118 }
119 
120 static bool setDoesNotCapture(Function &F, unsigned ArgNo) {
121   if (F.hasParamAttribute(ArgNo, Attribute::NoCapture))
122     return false;
123   F.addParamAttr(ArgNo, Attribute::NoCapture);
124   ++NumNoCapture;
125   return true;
126 }
127 
128 static bool setDoesNotAlias(Function &F, unsigned ArgNo) {
129   if (F.hasParamAttribute(ArgNo, Attribute::NoAlias))
130     return false;
131   F.addParamAttr(ArgNo, Attribute::NoAlias);
132   ++NumNoAlias;
133   return true;
134 }
135 
136 static bool setOnlyReadsMemory(Function &F, unsigned ArgNo) {
137   if (F.hasParamAttribute(ArgNo, Attribute::ReadOnly))
138     return false;
139   F.addParamAttr(ArgNo, Attribute::ReadOnly);
140   ++NumReadOnlyArg;
141   return true;
142 }
143 
144 static bool setOnlyWritesMemory(Function &F, unsigned ArgNo) {
145   if (F.hasParamAttribute(ArgNo, Attribute::WriteOnly))
146     return false;
147   F.addParamAttr(ArgNo, Attribute::WriteOnly);
148   ++NumWriteOnlyArg;
149   return true;
150 }
151 
152 static bool setRetNoUndef(Function &F) {
153   if (!F.getReturnType()->isVoidTy() &&
154       !F.hasRetAttribute(Attribute::NoUndef)) {
155     F.addRetAttr(Attribute::NoUndef);
156     ++NumNoUndef;
157     return true;
158   }
159   return false;
160 }
161 
162 static bool setArgsNoUndef(Function &F) {
163   bool Changed = false;
164   for (unsigned ArgNo = 0; ArgNo < F.arg_size(); ++ArgNo) {
165     if (!F.hasParamAttribute(ArgNo, Attribute::NoUndef)) {
166       F.addParamAttr(ArgNo, Attribute::NoUndef);
167       ++NumNoUndef;
168       Changed = true;
169     }
170   }
171   return Changed;
172 }
173 
174 static bool setArgNoUndef(Function &F, unsigned ArgNo) {
175   if (F.hasParamAttribute(ArgNo, Attribute::NoUndef))
176     return false;
177   F.addParamAttr(ArgNo, Attribute::NoUndef);
178   ++NumNoUndef;
179   return true;
180 }
181 
182 static bool setRetAndArgsNoUndef(Function &F) {
183   bool UndefAdded = false;
184   UndefAdded |= setRetNoUndef(F);
185   UndefAdded |= setArgsNoUndef(F);
186   return UndefAdded;
187 }
188 
189 static bool setReturnedArg(Function &F, unsigned ArgNo) {
190   if (F.hasParamAttribute(ArgNo, Attribute::Returned))
191     return false;
192   F.addParamAttr(ArgNo, Attribute::Returned);
193   ++NumReturnedArg;
194   return true;
195 }
196 
197 static bool setNonLazyBind(Function &F) {
198   if (F.hasFnAttribute(Attribute::NonLazyBind))
199     return false;
200   F.addFnAttr(Attribute::NonLazyBind);
201   return true;
202 }
203 
204 static bool setDoesNotFreeMemory(Function &F) {
205   if (F.hasFnAttribute(Attribute::NoFree))
206     return false;
207   F.addFnAttr(Attribute::NoFree);
208   return true;
209 }
210 
211 static bool setWillReturn(Function &F) {
212   if (F.hasFnAttribute(Attribute::WillReturn))
213     return false;
214   F.addFnAttr(Attribute::WillReturn);
215   ++NumWillReturn;
216   return true;
217 }
218 
219 static bool setAlignedAllocParam(Function &F, unsigned ArgNo) {
220   if (F.hasParamAttribute(ArgNo, Attribute::AllocAlign))
221     return false;
222   F.addParamAttr(ArgNo, Attribute::AllocAlign);
223   return true;
224 }
225 
226 static bool setAllocatedPointerParam(Function &F, unsigned ArgNo) {
227   if (F.hasParamAttribute(ArgNo, Attribute::AllocatedPointer))
228     return false;
229   F.addParamAttr(ArgNo, Attribute::AllocatedPointer);
230   return true;
231 }
232 
233 static bool setAllocSize(Function &F, unsigned ElemSizeArg,
234                          Optional<unsigned> NumElemsArg) {
235   if (F.hasFnAttribute(Attribute::AllocSize))
236     return false;
237   F.addFnAttr(Attribute::getWithAllocSizeArgs(F.getContext(), ElemSizeArg,
238                                               NumElemsArg));
239   return true;
240 }
241 
242 static bool setAllocFamily(Function &F, StringRef Family) {
243   if (F.hasFnAttribute("alloc-family"))
244     return false;
245   F.addFnAttr("alloc-family", Family);
246   return true;
247 }
248 
249 static bool setAllocKind(Function &F, AllocFnKind K) {
250   if (F.hasFnAttribute(Attribute::AllocKind))
251     return false;
252   F.addFnAttr(
253       Attribute::get(F.getContext(), Attribute::AllocKind, uint64_t(K)));
254   return true;
255 }
256 
257 bool llvm::inferNonMandatoryLibFuncAttrs(Module *M, StringRef Name,
258                                          const TargetLibraryInfo &TLI) {
259   Function *F = M->getFunction(Name);
260   if (!F)
261     return false;
262   return inferNonMandatoryLibFuncAttrs(*F, TLI);
263 }
264 
265 bool llvm::inferNonMandatoryLibFuncAttrs(Function &F,
266                                          const TargetLibraryInfo &TLI) {
267   LibFunc TheLibFunc;
268   if (!(TLI.getLibFunc(F, TheLibFunc) && TLI.has(TheLibFunc)))
269     return false;
270 
271   bool Changed = false;
272 
273   if (F.getParent() != nullptr && F.getParent()->getRtLibUseGOT())
274     Changed |= setNonLazyBind(F);
275 
276   switch (TheLibFunc) {
277   case LibFunc_strlen:
278   case LibFunc_strnlen:
279   case LibFunc_wcslen:
280     Changed |= setOnlyReadsMemory(F);
281     Changed |= setDoesNotThrow(F);
282     Changed |= setOnlyAccessesArgMemory(F);
283     Changed |= setWillReturn(F);
284     Changed |= setDoesNotCapture(F, 0);
285     break;
286   case LibFunc_strchr:
287   case LibFunc_strrchr:
288     Changed |= setOnlyAccessesArgMemory(F);
289     Changed |= setOnlyReadsMemory(F);
290     Changed |= setDoesNotThrow(F);
291     Changed |= setWillReturn(F);
292     break;
293   case LibFunc_strtol:
294   case LibFunc_strtod:
295   case LibFunc_strtof:
296   case LibFunc_strtoul:
297   case LibFunc_strtoll:
298   case LibFunc_strtold:
299   case LibFunc_strtoull:
300     Changed |= setDoesNotThrow(F);
301     Changed |= setWillReturn(F);
302     Changed |= setDoesNotCapture(F, 1);
303     Changed |= setOnlyReadsMemory(F, 0);
304     break;
305   case LibFunc_strcat:
306   case LibFunc_strncat:
307     Changed |= setOnlyAccessesArgMemory(F);
308     Changed |= setDoesNotThrow(F);
309     Changed |= setWillReturn(F);
310     Changed |= setReturnedArg(F, 0);
311     Changed |= setDoesNotCapture(F, 1);
312     Changed |= setOnlyReadsMemory(F, 1);
313     Changed |= setDoesNotAlias(F, 0);
314     Changed |= setDoesNotAlias(F, 1);
315     break;
316   case LibFunc_strcpy:
317   case LibFunc_strncpy:
318     Changed |= setReturnedArg(F, 0);
319     LLVM_FALLTHROUGH;
320   case LibFunc_stpcpy:
321   case LibFunc_stpncpy:
322     Changed |= setOnlyAccessesArgMemory(F);
323     Changed |= setDoesNotThrow(F);
324     Changed |= setWillReturn(F);
325     Changed |= setDoesNotCapture(F, 1);
326     Changed |= setOnlyWritesMemory(F, 0);
327     Changed |= setOnlyReadsMemory(F, 1);
328     Changed |= setDoesNotAlias(F, 0);
329     Changed |= setDoesNotAlias(F, 1);
330     break;
331   case LibFunc_strxfrm:
332     Changed |= setDoesNotThrow(F);
333     Changed |= setWillReturn(F);
334     Changed |= setDoesNotCapture(F, 0);
335     Changed |= setDoesNotCapture(F, 1);
336     Changed |= setOnlyReadsMemory(F, 1);
337     break;
338   case LibFunc_strcmp:      // 0,1
339   case LibFunc_strspn:      // 0,1
340   case LibFunc_strncmp:     // 0,1
341   case LibFunc_strcspn:     // 0,1
342     Changed |= setDoesNotThrow(F);
343     Changed |= setOnlyAccessesArgMemory(F);
344     Changed |= setWillReturn(F);
345     Changed |= setOnlyReadsMemory(F);
346     Changed |= setDoesNotCapture(F, 0);
347     Changed |= setDoesNotCapture(F, 1);
348     break;
349   case LibFunc_strcoll:
350   case LibFunc_strcasecmp:  // 0,1
351   case LibFunc_strncasecmp: //
352     // Those functions may depend on the locale, which may be accessed through
353     // global memory.
354     Changed |= setOnlyReadsMemory(F);
355     Changed |= setDoesNotThrow(F);
356     Changed |= setWillReturn(F);
357     Changed |= setDoesNotCapture(F, 0);
358     Changed |= setDoesNotCapture(F, 1);
359     break;
360   case LibFunc_strstr:
361   case LibFunc_strpbrk:
362     Changed |= setOnlyAccessesArgMemory(F);
363     Changed |= setOnlyReadsMemory(F);
364     Changed |= setDoesNotThrow(F);
365     Changed |= setWillReturn(F);
366     Changed |= setDoesNotCapture(F, 1);
367     break;
368   case LibFunc_strtok:
369   case LibFunc_strtok_r:
370     Changed |= setDoesNotThrow(F);
371     Changed |= setWillReturn(F);
372     Changed |= setDoesNotCapture(F, 1);
373     Changed |= setOnlyReadsMemory(F, 1);
374     break;
375   case LibFunc_scanf:
376     Changed |= setRetAndArgsNoUndef(F);
377     Changed |= setDoesNotThrow(F);
378     Changed |= setDoesNotCapture(F, 0);
379     Changed |= setOnlyReadsMemory(F, 0);
380     break;
381   case LibFunc_setbuf:
382   case LibFunc_setvbuf:
383     Changed |= setRetAndArgsNoUndef(F);
384     Changed |= setDoesNotThrow(F);
385     Changed |= setDoesNotCapture(F, 0);
386     break;
387   case LibFunc_strndup:
388     Changed |= setArgNoUndef(F, 1);
389     LLVM_FALLTHROUGH;
390   case LibFunc_strdup:
391     Changed |= setAllocFamily(F, "malloc");
392     Changed |= setOnlyAccessesInaccessibleMemOrArgMem(F);
393     Changed |= setDoesNotThrow(F);
394     Changed |= setRetDoesNotAlias(F);
395     Changed |= setWillReturn(F);
396     Changed |= setDoesNotCapture(F, 0);
397     Changed |= setOnlyReadsMemory(F, 0);
398     break;
399   case LibFunc_stat:
400   case LibFunc_statvfs:
401     Changed |= setRetAndArgsNoUndef(F);
402     Changed |= setDoesNotThrow(F);
403     Changed |= setDoesNotCapture(F, 0);
404     Changed |= setDoesNotCapture(F, 1);
405     Changed |= setOnlyReadsMemory(F, 0);
406     break;
407   case LibFunc_sscanf:
408     Changed |= setRetAndArgsNoUndef(F);
409     Changed |= setDoesNotThrow(F);
410     Changed |= setDoesNotCapture(F, 0);
411     Changed |= setDoesNotCapture(F, 1);
412     Changed |= setOnlyReadsMemory(F, 0);
413     Changed |= setOnlyReadsMemory(F, 1);
414     break;
415   case LibFunc_sprintf:
416     Changed |= setRetAndArgsNoUndef(F);
417     Changed |= setDoesNotThrow(F);
418     Changed |= setDoesNotCapture(F, 0);
419     Changed |= setDoesNotAlias(F, 0);
420     Changed |= setOnlyWritesMemory(F, 0);
421     Changed |= setDoesNotCapture(F, 1);
422     Changed |= setOnlyReadsMemory(F, 1);
423     break;
424   case LibFunc_snprintf:
425     Changed |= setRetAndArgsNoUndef(F);
426     Changed |= setDoesNotThrow(F);
427     Changed |= setDoesNotCapture(F, 0);
428     Changed |= setDoesNotAlias(F, 0);
429     Changed |= setOnlyWritesMemory(F, 0);
430     Changed |= setDoesNotCapture(F, 2);
431     Changed |= setOnlyReadsMemory(F, 2);
432     break;
433   case LibFunc_setitimer:
434     Changed |= setRetAndArgsNoUndef(F);
435     Changed |= setDoesNotThrow(F);
436     Changed |= setWillReturn(F);
437     Changed |= setDoesNotCapture(F, 1);
438     Changed |= setDoesNotCapture(F, 2);
439     Changed |= setOnlyReadsMemory(F, 1);
440     break;
441   case LibFunc_system:
442     // May throw; "system" is a valid pthread cancellation point.
443     Changed |= setRetAndArgsNoUndef(F);
444     Changed |= setDoesNotCapture(F, 0);
445     Changed |= setOnlyReadsMemory(F, 0);
446     break;
447   case LibFunc_aligned_alloc:
448     Changed |= setAlignedAllocParam(F, 0);
449     Changed |= setAllocSize(F, 1, None);
450     Changed |= setAllocKind(F, AllocFnKind::Alloc | AllocFnKind::Uninitialized | AllocFnKind::Aligned);
451     LLVM_FALLTHROUGH;
452   case LibFunc_valloc:
453   case LibFunc_malloc:
454   case LibFunc_vec_malloc:
455     Changed |= setAllocFamily(F, TheLibFunc == LibFunc_vec_malloc ? "vec_malloc"
456                                                                   : "malloc");
457     Changed |= setAllocKind(F, AllocFnKind::Alloc | AllocFnKind::Uninitialized);
458     Changed |= setAllocSize(F, 0, None);
459     Changed |= setOnlyAccessesInaccessibleMemory(F);
460     Changed |= setRetAndArgsNoUndef(F);
461     Changed |= setDoesNotThrow(F);
462     Changed |= setRetDoesNotAlias(F);
463     Changed |= setWillReturn(F);
464     break;
465   case LibFunc_memcmp:
466     Changed |= setOnlyAccessesArgMemory(F);
467     Changed |= setOnlyReadsMemory(F);
468     Changed |= setDoesNotThrow(F);
469     Changed |= setWillReturn(F);
470     Changed |= setDoesNotCapture(F, 0);
471     Changed |= setDoesNotCapture(F, 1);
472     break;
473   case LibFunc_memchr:
474   case LibFunc_memrchr:
475     Changed |= setDoesNotThrow(F);
476     Changed |= setOnlyAccessesArgMemory(F);
477     Changed |= setOnlyReadsMemory(F);
478     Changed |= setWillReturn(F);
479     break;
480   case LibFunc_modf:
481   case LibFunc_modff:
482   case LibFunc_modfl:
483     Changed |= setDoesNotThrow(F);
484     Changed |= setWillReturn(F);
485     Changed |= setDoesNotCapture(F, 1);
486     break;
487   case LibFunc_memcpy:
488     Changed |= setDoesNotThrow(F);
489     Changed |= setOnlyAccessesArgMemory(F);
490     Changed |= setWillReturn(F);
491     Changed |= setDoesNotAlias(F, 0);
492     Changed |= setReturnedArg(F, 0);
493     Changed |= setOnlyWritesMemory(F, 0);
494     Changed |= setDoesNotAlias(F, 1);
495     Changed |= setDoesNotCapture(F, 1);
496     Changed |= setOnlyReadsMemory(F, 1);
497     break;
498   case LibFunc_memmove:
499     Changed |= setDoesNotThrow(F);
500     Changed |= setOnlyAccessesArgMemory(F);
501     Changed |= setWillReturn(F);
502     Changed |= setReturnedArg(F, 0);
503     Changed |= setOnlyWritesMemory(F, 0);
504     Changed |= setDoesNotCapture(F, 1);
505     Changed |= setOnlyReadsMemory(F, 1);
506     break;
507   case LibFunc_mempcpy:
508   case LibFunc_memccpy:
509     Changed |= setWillReturn(F);
510     LLVM_FALLTHROUGH;
511   case LibFunc_memcpy_chk:
512     Changed |= setDoesNotThrow(F);
513     Changed |= setOnlyAccessesArgMemory(F);
514     Changed |= setDoesNotAlias(F, 0);
515     Changed |= setOnlyWritesMemory(F, 0);
516     Changed |= setDoesNotAlias(F, 1);
517     Changed |= setDoesNotCapture(F, 1);
518     Changed |= setOnlyReadsMemory(F, 1);
519     break;
520   case LibFunc_memalign:
521     Changed |= setAllocFamily(F, "malloc");
522     Changed |= setAllocKind(F, AllocFnKind::Alloc | AllocFnKind::Aligned |
523                                    AllocFnKind::Uninitialized);
524     Changed |= setAllocSize(F, 1, None);
525     Changed |= setAlignedAllocParam(F, 0);
526     Changed |= setOnlyAccessesInaccessibleMemory(F);
527     Changed |= setRetNoUndef(F);
528     Changed |= setDoesNotThrow(F);
529     Changed |= setRetDoesNotAlias(F);
530     Changed |= setWillReturn(F);
531     break;
532   case LibFunc_mkdir:
533     Changed |= setRetAndArgsNoUndef(F);
534     Changed |= setDoesNotThrow(F);
535     Changed |= setDoesNotCapture(F, 0);
536     Changed |= setOnlyReadsMemory(F, 0);
537     break;
538   case LibFunc_mktime:
539     Changed |= setRetAndArgsNoUndef(F);
540     Changed |= setDoesNotThrow(F);
541     Changed |= setWillReturn(F);
542     Changed |= setDoesNotCapture(F, 0);
543     break;
544   case LibFunc_realloc:
545   case LibFunc_reallocf:
546   case LibFunc_vec_realloc:
547     Changed |= setAllocFamily(
548         F, TheLibFunc == LibFunc_vec_realloc ? "vec_malloc" : "malloc");
549     Changed |= setAllocKind(F, AllocFnKind::Realloc);
550     Changed |= setAllocatedPointerParam(F, 0);
551     Changed |= setAllocSize(F, 1, None);
552     Changed |= setOnlyAccessesInaccessibleMemOrArgMem(F);
553     Changed |= setRetNoUndef(F);
554     Changed |= setDoesNotThrow(F);
555     Changed |= setRetDoesNotAlias(F);
556     Changed |= setWillReturn(F);
557     Changed |= setDoesNotCapture(F, 0);
558     Changed |= setArgNoUndef(F, 1);
559     break;
560   case LibFunc_read:
561     // May throw; "read" is a valid pthread cancellation point.
562     Changed |= setRetAndArgsNoUndef(F);
563     Changed |= setDoesNotCapture(F, 1);
564     break;
565   case LibFunc_rewind:
566     Changed |= setRetAndArgsNoUndef(F);
567     Changed |= setDoesNotThrow(F);
568     Changed |= setDoesNotCapture(F, 0);
569     break;
570   case LibFunc_rmdir:
571   case LibFunc_remove:
572   case LibFunc_realpath:
573     Changed |= setRetAndArgsNoUndef(F);
574     Changed |= setDoesNotThrow(F);
575     Changed |= setDoesNotCapture(F, 0);
576     Changed |= setOnlyReadsMemory(F, 0);
577     break;
578   case LibFunc_rename:
579     Changed |= setRetAndArgsNoUndef(F);
580     Changed |= setDoesNotThrow(F);
581     Changed |= setDoesNotCapture(F, 0);
582     Changed |= setDoesNotCapture(F, 1);
583     Changed |= setOnlyReadsMemory(F, 0);
584     Changed |= setOnlyReadsMemory(F, 1);
585     break;
586   case LibFunc_readlink:
587     Changed |= setRetAndArgsNoUndef(F);
588     Changed |= setDoesNotThrow(F);
589     Changed |= setDoesNotCapture(F, 0);
590     Changed |= setDoesNotCapture(F, 1);
591     Changed |= setOnlyReadsMemory(F, 0);
592     break;
593   case LibFunc_write:
594     // May throw; "write" is a valid pthread cancellation point.
595     Changed |= setRetAndArgsNoUndef(F);
596     Changed |= setDoesNotCapture(F, 1);
597     Changed |= setOnlyReadsMemory(F, 1);
598     break;
599   case LibFunc_bcopy:
600     Changed |= setDoesNotThrow(F);
601     Changed |= setOnlyAccessesArgMemory(F);
602     Changed |= setWillReturn(F);
603     Changed |= setDoesNotCapture(F, 0);
604     Changed |= setOnlyReadsMemory(F, 0);
605     Changed |= setOnlyWritesMemory(F, 1);
606     Changed |= setDoesNotCapture(F, 1);
607     break;
608   case LibFunc_bcmp:
609     Changed |= setDoesNotThrow(F);
610     Changed |= setOnlyAccessesArgMemory(F);
611     Changed |= setOnlyReadsMemory(F);
612     Changed |= setWillReturn(F);
613     Changed |= setDoesNotCapture(F, 0);
614     Changed |= setDoesNotCapture(F, 1);
615     break;
616   case LibFunc_bzero:
617     Changed |= setDoesNotThrow(F);
618     Changed |= setOnlyAccessesArgMemory(F);
619     Changed |= setWillReturn(F);
620     Changed |= setDoesNotCapture(F, 0);
621     Changed |= setOnlyWritesMemory(F, 0);
622     break;
623   case LibFunc_calloc:
624   case LibFunc_vec_calloc:
625     Changed |= setAllocFamily(F, TheLibFunc == LibFunc_vec_calloc ? "vec_malloc"
626                                                                   : "malloc");
627     Changed |= setAllocKind(F, AllocFnKind::Alloc | AllocFnKind::Zeroed);
628     Changed |= setAllocSize(F, 0, 1);
629     Changed |= setOnlyAccessesInaccessibleMemory(F);
630     Changed |= setRetAndArgsNoUndef(F);
631     Changed |= setDoesNotThrow(F);
632     Changed |= setRetDoesNotAlias(F);
633     Changed |= setWillReturn(F);
634     break;
635   case LibFunc_chmod:
636   case LibFunc_chown:
637     Changed |= setRetAndArgsNoUndef(F);
638     Changed |= setDoesNotThrow(F);
639     Changed |= setDoesNotCapture(F, 0);
640     Changed |= setOnlyReadsMemory(F, 0);
641     break;
642   case LibFunc_ctermid:
643   case LibFunc_clearerr:
644   case LibFunc_closedir:
645     Changed |= setRetAndArgsNoUndef(F);
646     Changed |= setDoesNotThrow(F);
647     Changed |= setDoesNotCapture(F, 0);
648     break;
649   case LibFunc_atoi:
650   case LibFunc_atol:
651   case LibFunc_atof:
652   case LibFunc_atoll:
653     Changed |= setDoesNotThrow(F);
654     Changed |= setOnlyReadsMemory(F);
655     Changed |= setWillReturn(F);
656     Changed |= setDoesNotCapture(F, 0);
657     break;
658   case LibFunc_access:
659     Changed |= setRetAndArgsNoUndef(F);
660     Changed |= setDoesNotThrow(F);
661     Changed |= setDoesNotCapture(F, 0);
662     Changed |= setOnlyReadsMemory(F, 0);
663     break;
664   case LibFunc_fopen:
665     Changed |= setRetAndArgsNoUndef(F);
666     Changed |= setDoesNotThrow(F);
667     Changed |= setRetDoesNotAlias(F);
668     Changed |= setDoesNotCapture(F, 0);
669     Changed |= setDoesNotCapture(F, 1);
670     Changed |= setOnlyReadsMemory(F, 0);
671     Changed |= setOnlyReadsMemory(F, 1);
672     break;
673   case LibFunc_fdopen:
674     Changed |= setRetAndArgsNoUndef(F);
675     Changed |= setDoesNotThrow(F);
676     Changed |= setRetDoesNotAlias(F);
677     Changed |= setDoesNotCapture(F, 1);
678     Changed |= setOnlyReadsMemory(F, 1);
679     break;
680   case LibFunc_feof:
681     Changed |= setRetAndArgsNoUndef(F);
682     Changed |= setDoesNotThrow(F);
683     Changed |= setDoesNotCapture(F, 0);
684     break;
685   case LibFunc_free:
686   case LibFunc_vec_free:
687     Changed |= setAllocFamily(F, TheLibFunc == LibFunc_vec_free ? "vec_malloc"
688                                                                 : "malloc");
689     Changed |= setAllocKind(F, AllocFnKind::Free);
690     Changed |= setAllocatedPointerParam(F, 0);
691     Changed |= setOnlyAccessesInaccessibleMemOrArgMem(F);
692     Changed |= setArgsNoUndef(F);
693     Changed |= setDoesNotThrow(F);
694     Changed |= setWillReturn(F);
695     Changed |= setDoesNotCapture(F, 0);
696     break;
697   case LibFunc_fseek:
698   case LibFunc_ftell:
699   case LibFunc_fgetc:
700   case LibFunc_fgetc_unlocked:
701   case LibFunc_fseeko:
702   case LibFunc_ftello:
703   case LibFunc_fileno:
704   case LibFunc_fflush:
705   case LibFunc_fclose:
706   case LibFunc_fsetpos:
707   case LibFunc_flockfile:
708   case LibFunc_funlockfile:
709   case LibFunc_ftrylockfile:
710     Changed |= setRetAndArgsNoUndef(F);
711     Changed |= setDoesNotThrow(F);
712     Changed |= setDoesNotCapture(F, 0);
713     break;
714   case LibFunc_ferror:
715     Changed |= setRetAndArgsNoUndef(F);
716     Changed |= setDoesNotThrow(F);
717     Changed |= setDoesNotCapture(F, 0);
718     Changed |= setOnlyReadsMemory(F);
719     break;
720   case LibFunc_fputc:
721   case LibFunc_fputc_unlocked:
722   case LibFunc_fstat:
723     Changed |= setRetAndArgsNoUndef(F);
724     Changed |= setDoesNotThrow(F);
725     Changed |= setDoesNotCapture(F, 1);
726     break;
727   case LibFunc_frexp:
728   case LibFunc_frexpf:
729   case LibFunc_frexpl:
730     Changed |= setDoesNotThrow(F);
731     Changed |= setWillReturn(F);
732     Changed |= setDoesNotCapture(F, 1);
733     break;
734   case LibFunc_fstatvfs:
735     Changed |= setRetAndArgsNoUndef(F);
736     Changed |= setDoesNotThrow(F);
737     Changed |= setDoesNotCapture(F, 1);
738     break;
739   case LibFunc_fgets:
740   case LibFunc_fgets_unlocked:
741     Changed |= setRetAndArgsNoUndef(F);
742     Changed |= setDoesNotThrow(F);
743     Changed |= setDoesNotCapture(F, 2);
744     break;
745   case LibFunc_fread:
746   case LibFunc_fread_unlocked:
747     Changed |= setRetAndArgsNoUndef(F);
748     Changed |= setDoesNotThrow(F);
749     Changed |= setDoesNotCapture(F, 0);
750     Changed |= setDoesNotCapture(F, 3);
751     break;
752   case LibFunc_fwrite:
753   case LibFunc_fwrite_unlocked:
754     Changed |= setRetAndArgsNoUndef(F);
755     Changed |= setDoesNotThrow(F);
756     Changed |= setDoesNotCapture(F, 0);
757     Changed |= setDoesNotCapture(F, 3);
758     // FIXME: readonly #1?
759     break;
760   case LibFunc_fputs:
761   case LibFunc_fputs_unlocked:
762     Changed |= setRetAndArgsNoUndef(F);
763     Changed |= setDoesNotThrow(F);
764     Changed |= setDoesNotCapture(F, 0);
765     Changed |= setDoesNotCapture(F, 1);
766     Changed |= setOnlyReadsMemory(F, 0);
767     break;
768   case LibFunc_fscanf:
769   case LibFunc_fprintf:
770     Changed |= setRetAndArgsNoUndef(F);
771     Changed |= setDoesNotThrow(F);
772     Changed |= setDoesNotCapture(F, 0);
773     Changed |= setDoesNotCapture(F, 1);
774     Changed |= setOnlyReadsMemory(F, 1);
775     break;
776   case LibFunc_fgetpos:
777     Changed |= setRetAndArgsNoUndef(F);
778     Changed |= setDoesNotThrow(F);
779     Changed |= setDoesNotCapture(F, 0);
780     Changed |= setDoesNotCapture(F, 1);
781     break;
782   case LibFunc_getc:
783     Changed |= setRetAndArgsNoUndef(F);
784     Changed |= setDoesNotThrow(F);
785     Changed |= setDoesNotCapture(F, 0);
786     break;
787   case LibFunc_getlogin_r:
788     Changed |= setRetAndArgsNoUndef(F);
789     Changed |= setDoesNotThrow(F);
790     Changed |= setDoesNotCapture(F, 0);
791     break;
792   case LibFunc_getc_unlocked:
793     Changed |= setRetAndArgsNoUndef(F);
794     Changed |= setDoesNotThrow(F);
795     Changed |= setDoesNotCapture(F, 0);
796     break;
797   case LibFunc_getenv:
798     Changed |= setRetAndArgsNoUndef(F);
799     Changed |= setDoesNotThrow(F);
800     Changed |= setOnlyReadsMemory(F);
801     Changed |= setDoesNotCapture(F, 0);
802     break;
803   case LibFunc_gets:
804   case LibFunc_getchar:
805   case LibFunc_getchar_unlocked:
806     Changed |= setRetAndArgsNoUndef(F);
807     Changed |= setDoesNotThrow(F);
808     break;
809   case LibFunc_getitimer:
810     Changed |= setRetAndArgsNoUndef(F);
811     Changed |= setDoesNotThrow(F);
812     Changed |= setDoesNotCapture(F, 1);
813     break;
814   case LibFunc_getpwnam:
815     Changed |= setRetAndArgsNoUndef(F);
816     Changed |= setDoesNotThrow(F);
817     Changed |= setDoesNotCapture(F, 0);
818     Changed |= setOnlyReadsMemory(F, 0);
819     break;
820   case LibFunc_ungetc:
821     Changed |= setRetAndArgsNoUndef(F);
822     Changed |= setDoesNotThrow(F);
823     Changed |= setDoesNotCapture(F, 1);
824     break;
825   case LibFunc_uname:
826     Changed |= setRetAndArgsNoUndef(F);
827     Changed |= setDoesNotThrow(F);
828     Changed |= setDoesNotCapture(F, 0);
829     break;
830   case LibFunc_unlink:
831     Changed |= setRetAndArgsNoUndef(F);
832     Changed |= setDoesNotThrow(F);
833     Changed |= setDoesNotCapture(F, 0);
834     Changed |= setOnlyReadsMemory(F, 0);
835     break;
836   case LibFunc_unsetenv:
837     Changed |= setRetAndArgsNoUndef(F);
838     Changed |= setDoesNotThrow(F);
839     Changed |= setDoesNotCapture(F, 0);
840     Changed |= setOnlyReadsMemory(F, 0);
841     break;
842   case LibFunc_utime:
843   case LibFunc_utimes:
844     Changed |= setRetAndArgsNoUndef(F);
845     Changed |= setDoesNotThrow(F);
846     Changed |= setDoesNotCapture(F, 0);
847     Changed |= setDoesNotCapture(F, 1);
848     Changed |= setOnlyReadsMemory(F, 0);
849     Changed |= setOnlyReadsMemory(F, 1);
850     break;
851   case LibFunc_putc:
852   case LibFunc_putc_unlocked:
853     Changed |= setRetAndArgsNoUndef(F);
854     Changed |= setDoesNotThrow(F);
855     Changed |= setDoesNotCapture(F, 1);
856     break;
857   case LibFunc_puts:
858   case LibFunc_printf:
859   case LibFunc_perror:
860     Changed |= setRetAndArgsNoUndef(F);
861     Changed |= setDoesNotThrow(F);
862     Changed |= setDoesNotCapture(F, 0);
863     Changed |= setOnlyReadsMemory(F, 0);
864     break;
865   case LibFunc_pread:
866     // May throw; "pread" is a valid pthread cancellation point.
867     Changed |= setRetAndArgsNoUndef(F);
868     Changed |= setDoesNotCapture(F, 1);
869     break;
870   case LibFunc_pwrite:
871     // May throw; "pwrite" is a valid pthread cancellation point.
872     Changed |= setRetAndArgsNoUndef(F);
873     Changed |= setDoesNotCapture(F, 1);
874     Changed |= setOnlyReadsMemory(F, 1);
875     break;
876   case LibFunc_putchar:
877   case LibFunc_putchar_unlocked:
878     Changed |= setRetAndArgsNoUndef(F);
879     Changed |= setDoesNotThrow(F);
880     break;
881   case LibFunc_popen:
882     Changed |= setRetAndArgsNoUndef(F);
883     Changed |= setDoesNotThrow(F);
884     Changed |= setRetDoesNotAlias(F);
885     Changed |= setDoesNotCapture(F, 0);
886     Changed |= setDoesNotCapture(F, 1);
887     Changed |= setOnlyReadsMemory(F, 0);
888     Changed |= setOnlyReadsMemory(F, 1);
889     break;
890   case LibFunc_pclose:
891     Changed |= setRetAndArgsNoUndef(F);
892     Changed |= setDoesNotThrow(F);
893     Changed |= setDoesNotCapture(F, 0);
894     break;
895   case LibFunc_vscanf:
896     Changed |= setRetAndArgsNoUndef(F);
897     Changed |= setDoesNotThrow(F);
898     Changed |= setDoesNotCapture(F, 0);
899     Changed |= setOnlyReadsMemory(F, 0);
900     break;
901   case LibFunc_vsscanf:
902     Changed |= setRetAndArgsNoUndef(F);
903     Changed |= setDoesNotThrow(F);
904     Changed |= setDoesNotCapture(F, 0);
905     Changed |= setDoesNotCapture(F, 1);
906     Changed |= setOnlyReadsMemory(F, 0);
907     Changed |= setOnlyReadsMemory(F, 1);
908     break;
909   case LibFunc_vfscanf:
910     Changed |= setRetAndArgsNoUndef(F);
911     Changed |= setDoesNotThrow(F);
912     Changed |= setDoesNotCapture(F, 0);
913     Changed |= setDoesNotCapture(F, 1);
914     Changed |= setOnlyReadsMemory(F, 1);
915     break;
916   case LibFunc_vprintf:
917     Changed |= setRetAndArgsNoUndef(F);
918     Changed |= setDoesNotThrow(F);
919     Changed |= setDoesNotCapture(F, 0);
920     Changed |= setOnlyReadsMemory(F, 0);
921     break;
922   case LibFunc_vfprintf:
923   case LibFunc_vsprintf:
924     Changed |= setRetAndArgsNoUndef(F);
925     Changed |= setDoesNotThrow(F);
926     Changed |= setDoesNotCapture(F, 0);
927     Changed |= setDoesNotCapture(F, 1);
928     Changed |= setOnlyReadsMemory(F, 1);
929     break;
930   case LibFunc_vsnprintf:
931     Changed |= setRetAndArgsNoUndef(F);
932     Changed |= setDoesNotThrow(F);
933     Changed |= setDoesNotCapture(F, 0);
934     Changed |= setDoesNotCapture(F, 2);
935     Changed |= setOnlyReadsMemory(F, 2);
936     break;
937   case LibFunc_open:
938     // May throw; "open" is a valid pthread cancellation point.
939     Changed |= setRetAndArgsNoUndef(F);
940     Changed |= setDoesNotCapture(F, 0);
941     Changed |= setOnlyReadsMemory(F, 0);
942     break;
943   case LibFunc_opendir:
944     Changed |= setRetAndArgsNoUndef(F);
945     Changed |= setDoesNotThrow(F);
946     Changed |= setRetDoesNotAlias(F);
947     Changed |= setDoesNotCapture(F, 0);
948     Changed |= setOnlyReadsMemory(F, 0);
949     break;
950   case LibFunc_tmpfile:
951     Changed |= setRetAndArgsNoUndef(F);
952     Changed |= setDoesNotThrow(F);
953     Changed |= setRetDoesNotAlias(F);
954     break;
955   case LibFunc_times:
956     Changed |= setRetAndArgsNoUndef(F);
957     Changed |= setDoesNotThrow(F);
958     Changed |= setDoesNotCapture(F, 0);
959     break;
960   case LibFunc_htonl:
961   case LibFunc_htons:
962   case LibFunc_ntohl:
963   case LibFunc_ntohs:
964     Changed |= setDoesNotThrow(F);
965     Changed |= setDoesNotAccessMemory(F);
966     break;
967   case LibFunc_lstat:
968     Changed |= setRetAndArgsNoUndef(F);
969     Changed |= setDoesNotThrow(F);
970     Changed |= setDoesNotCapture(F, 0);
971     Changed |= setDoesNotCapture(F, 1);
972     Changed |= setOnlyReadsMemory(F, 0);
973     break;
974   case LibFunc_lchown:
975     Changed |= setRetAndArgsNoUndef(F);
976     Changed |= setDoesNotThrow(F);
977     Changed |= setDoesNotCapture(F, 0);
978     Changed |= setOnlyReadsMemory(F, 0);
979     break;
980   case LibFunc_qsort:
981     // May throw; places call through function pointer.
982     // Cannot give undef pointer/size
983     Changed |= setRetAndArgsNoUndef(F);
984     Changed |= setDoesNotCapture(F, 3);
985     break;
986   case LibFunc_dunder_strndup:
987     Changed |= setArgNoUndef(F, 1);
988     LLVM_FALLTHROUGH;
989   case LibFunc_dunder_strdup:
990     Changed |= setDoesNotThrow(F);
991     Changed |= setRetDoesNotAlias(F);
992     Changed |= setWillReturn(F);
993     Changed |= setDoesNotCapture(F, 0);
994     Changed |= setOnlyReadsMemory(F, 0);
995     break;
996   case LibFunc_dunder_strtok_r:
997     Changed |= setDoesNotThrow(F);
998     Changed |= setDoesNotCapture(F, 1);
999     Changed |= setOnlyReadsMemory(F, 1);
1000     break;
1001   case LibFunc_under_IO_getc:
1002     Changed |= setRetAndArgsNoUndef(F);
1003     Changed |= setDoesNotThrow(F);
1004     Changed |= setDoesNotCapture(F, 0);
1005     break;
1006   case LibFunc_under_IO_putc:
1007     Changed |= setRetAndArgsNoUndef(F);
1008     Changed |= setDoesNotThrow(F);
1009     Changed |= setDoesNotCapture(F, 1);
1010     break;
1011   case LibFunc_dunder_isoc99_scanf:
1012     Changed |= setRetAndArgsNoUndef(F);
1013     Changed |= setDoesNotThrow(F);
1014     Changed |= setDoesNotCapture(F, 0);
1015     Changed |= setOnlyReadsMemory(F, 0);
1016     break;
1017   case LibFunc_stat64:
1018   case LibFunc_lstat64:
1019   case LibFunc_statvfs64:
1020     Changed |= setRetAndArgsNoUndef(F);
1021     Changed |= setDoesNotThrow(F);
1022     Changed |= setDoesNotCapture(F, 0);
1023     Changed |= setDoesNotCapture(F, 1);
1024     Changed |= setOnlyReadsMemory(F, 0);
1025     break;
1026   case LibFunc_dunder_isoc99_sscanf:
1027     Changed |= setRetAndArgsNoUndef(F);
1028     Changed |= setDoesNotThrow(F);
1029     Changed |= setDoesNotCapture(F, 0);
1030     Changed |= setDoesNotCapture(F, 1);
1031     Changed |= setOnlyReadsMemory(F, 0);
1032     Changed |= setOnlyReadsMemory(F, 1);
1033     break;
1034   case LibFunc_fopen64:
1035     Changed |= setRetAndArgsNoUndef(F);
1036     Changed |= setDoesNotThrow(F);
1037     Changed |= setRetDoesNotAlias(F);
1038     Changed |= setDoesNotCapture(F, 0);
1039     Changed |= setDoesNotCapture(F, 1);
1040     Changed |= setOnlyReadsMemory(F, 0);
1041     Changed |= setOnlyReadsMemory(F, 1);
1042     break;
1043   case LibFunc_fseeko64:
1044   case LibFunc_ftello64:
1045     Changed |= setRetAndArgsNoUndef(F);
1046     Changed |= setDoesNotThrow(F);
1047     Changed |= setDoesNotCapture(F, 0);
1048     break;
1049   case LibFunc_tmpfile64:
1050     Changed |= setRetAndArgsNoUndef(F);
1051     Changed |= setDoesNotThrow(F);
1052     Changed |= setRetDoesNotAlias(F);
1053     break;
1054   case LibFunc_fstat64:
1055   case LibFunc_fstatvfs64:
1056     Changed |= setRetAndArgsNoUndef(F);
1057     Changed |= setDoesNotThrow(F);
1058     Changed |= setDoesNotCapture(F, 1);
1059     break;
1060   case LibFunc_open64:
1061     // May throw; "open" is a valid pthread cancellation point.
1062     Changed |= setRetAndArgsNoUndef(F);
1063     Changed |= setDoesNotCapture(F, 0);
1064     Changed |= setOnlyReadsMemory(F, 0);
1065     break;
1066   case LibFunc_gettimeofday:
1067     // Currently some platforms have the restrict keyword on the arguments to
1068     // gettimeofday. To be conservative, do not add noalias to gettimeofday's
1069     // arguments.
1070     Changed |= setRetAndArgsNoUndef(F);
1071     Changed |= setDoesNotThrow(F);
1072     Changed |= setDoesNotCapture(F, 0);
1073     Changed |= setDoesNotCapture(F, 1);
1074     break;
1075   case LibFunc_memset_pattern4:
1076   case LibFunc_memset_pattern8:
1077   case LibFunc_memset_pattern16:
1078     Changed |= setDoesNotCapture(F, 0);
1079     Changed |= setDoesNotCapture(F, 1);
1080     Changed |= setOnlyReadsMemory(F, 1);
1081     LLVM_FALLTHROUGH;
1082   case LibFunc_memset:
1083     Changed |= setWillReturn(F);
1084     LLVM_FALLTHROUGH;
1085   case LibFunc_memset_chk:
1086     Changed |= setOnlyAccessesArgMemory(F);
1087     Changed |= setOnlyWritesMemory(F, 0);
1088     Changed |= setDoesNotThrow(F);
1089     break;
1090   // int __nvvm_reflect(const char *)
1091   case LibFunc_nvvm_reflect:
1092     Changed |= setRetAndArgsNoUndef(F);
1093     Changed |= setDoesNotAccessMemory(F);
1094     Changed |= setDoesNotThrow(F);
1095     break;
1096   case LibFunc_ldexp:
1097   case LibFunc_ldexpf:
1098   case LibFunc_ldexpl:
1099     Changed |= setWillReturn(F);
1100     break;
1101   case LibFunc_abs:
1102   case LibFunc_acos:
1103   case LibFunc_acosf:
1104   case LibFunc_acosh:
1105   case LibFunc_acoshf:
1106   case LibFunc_acoshl:
1107   case LibFunc_acosl:
1108   case LibFunc_asin:
1109   case LibFunc_asinf:
1110   case LibFunc_asinh:
1111   case LibFunc_asinhf:
1112   case LibFunc_asinhl:
1113   case LibFunc_asinl:
1114   case LibFunc_atan:
1115   case LibFunc_atan2:
1116   case LibFunc_atan2f:
1117   case LibFunc_atan2l:
1118   case LibFunc_atanf:
1119   case LibFunc_atanh:
1120   case LibFunc_atanhf:
1121   case LibFunc_atanhl:
1122   case LibFunc_atanl:
1123   case LibFunc_cbrt:
1124   case LibFunc_cbrtf:
1125   case LibFunc_cbrtl:
1126   case LibFunc_ceil:
1127   case LibFunc_ceilf:
1128   case LibFunc_ceill:
1129   case LibFunc_copysign:
1130   case LibFunc_copysignf:
1131   case LibFunc_copysignl:
1132   case LibFunc_cos:
1133   case LibFunc_cosh:
1134   case LibFunc_coshf:
1135   case LibFunc_coshl:
1136   case LibFunc_cosf:
1137   case LibFunc_cosl:
1138   case LibFunc_cospi:
1139   case LibFunc_cospif:
1140   case LibFunc_exp:
1141   case LibFunc_expf:
1142   case LibFunc_expl:
1143   case LibFunc_exp2:
1144   case LibFunc_exp2f:
1145   case LibFunc_exp2l:
1146   case LibFunc_expm1:
1147   case LibFunc_expm1f:
1148   case LibFunc_expm1l:
1149   case LibFunc_fabs:
1150   case LibFunc_fabsf:
1151   case LibFunc_fabsl:
1152   case LibFunc_ffs:
1153   case LibFunc_ffsl:
1154   case LibFunc_ffsll:
1155   case LibFunc_floor:
1156   case LibFunc_floorf:
1157   case LibFunc_floorl:
1158   case LibFunc_fls:
1159   case LibFunc_flsl:
1160   case LibFunc_flsll:
1161   case LibFunc_fmax:
1162   case LibFunc_fmaxf:
1163   case LibFunc_fmaxl:
1164   case LibFunc_fmin:
1165   case LibFunc_fminf:
1166   case LibFunc_fminl:
1167   case LibFunc_fmod:
1168   case LibFunc_fmodf:
1169   case LibFunc_fmodl:
1170   case LibFunc_isascii:
1171   case LibFunc_isdigit:
1172   case LibFunc_labs:
1173   case LibFunc_llabs:
1174   case LibFunc_log:
1175   case LibFunc_log10:
1176   case LibFunc_log10f:
1177   case LibFunc_log10l:
1178   case LibFunc_log1p:
1179   case LibFunc_log1pf:
1180   case LibFunc_log1pl:
1181   case LibFunc_log2:
1182   case LibFunc_log2f:
1183   case LibFunc_log2l:
1184   case LibFunc_logb:
1185   case LibFunc_logbf:
1186   case LibFunc_logbl:
1187   case LibFunc_logf:
1188   case LibFunc_logl:
1189   case LibFunc_nearbyint:
1190   case LibFunc_nearbyintf:
1191   case LibFunc_nearbyintl:
1192   case LibFunc_pow:
1193   case LibFunc_powf:
1194   case LibFunc_powl:
1195   case LibFunc_rint:
1196   case LibFunc_rintf:
1197   case LibFunc_rintl:
1198   case LibFunc_round:
1199   case LibFunc_roundf:
1200   case LibFunc_roundl:
1201   case LibFunc_sin:
1202   case LibFunc_sincospif_stret:
1203   case LibFunc_sinf:
1204   case LibFunc_sinh:
1205   case LibFunc_sinhf:
1206   case LibFunc_sinhl:
1207   case LibFunc_sinl:
1208   case LibFunc_sinpi:
1209   case LibFunc_sinpif:
1210   case LibFunc_sqrt:
1211   case LibFunc_sqrtf:
1212   case LibFunc_sqrtl:
1213   case LibFunc_tan:
1214   case LibFunc_tanf:
1215   case LibFunc_tanh:
1216   case LibFunc_tanhf:
1217   case LibFunc_tanhl:
1218   case LibFunc_tanl:
1219   case LibFunc_toascii:
1220   case LibFunc_trunc:
1221   case LibFunc_truncf:
1222   case LibFunc_truncl:
1223     Changed |= setDoesNotThrow(F);
1224     Changed |= setDoesNotFreeMemory(F);
1225     Changed |= setOnlyWritesMemory(F);
1226     Changed |= setWillReturn(F);
1227     break;
1228   default:
1229     // FIXME: It'd be really nice to cover all the library functions we're
1230     // aware of here.
1231     break;
1232   }
1233   // We have to do this step after AllocKind has been inferred on functions so
1234   // we can reliably identify free-like and realloc-like functions.
1235   if (!isLibFreeFunction(&F, TheLibFunc) && !isReallocLikeFn(&F, &TLI))
1236     Changed |= setDoesNotFreeMemory(F);
1237   return Changed;
1238 }
1239 
1240 static void setArgExtAttr(Function &F, unsigned ArgNo,
1241                           const TargetLibraryInfo &TLI, bool Signed = true) {
1242   Attribute::AttrKind ExtAttr = TLI.getExtAttrForI32Param(Signed);
1243   if (ExtAttr != Attribute::None && !F.hasParamAttribute(ArgNo, ExtAttr))
1244     F.addParamAttr(ArgNo, ExtAttr);
1245 }
1246 
1247 // Modeled after X86TargetLowering::markLibCallAttributes.
1248 static void markRegisterParameterAttributes(Function *F) {
1249   if (!F->arg_size() || F->isVarArg())
1250     return;
1251 
1252   const CallingConv::ID CC = F->getCallingConv();
1253   if (CC != CallingConv::C && CC != CallingConv::X86_StdCall)
1254     return;
1255 
1256   const Module *M = F->getParent();
1257   unsigned N = M->getNumberRegisterParameters();
1258   if (!N)
1259     return;
1260 
1261   const DataLayout &DL = M->getDataLayout();
1262 
1263   for (Argument &A : F->args()) {
1264     Type *T = A.getType();
1265     if (!T->isIntOrPtrTy())
1266       continue;
1267 
1268     const TypeSize &TS = DL.getTypeAllocSize(T);
1269     if (TS > 8)
1270       continue;
1271 
1272     assert(TS <= 4 && "Need to account for parameters larger than word size");
1273     const unsigned NumRegs = TS > 4 ? 2 : 1;
1274     if (N < NumRegs)
1275       return;
1276 
1277     N -= NumRegs;
1278     F->addParamAttr(A.getArgNo(), Attribute::InReg);
1279   }
1280 }
1281 
1282 FunctionCallee llvm::getOrInsertLibFunc(Module *M, const TargetLibraryInfo &TLI,
1283                                         LibFunc TheLibFunc, FunctionType *T,
1284                                         AttributeList AttributeList) {
1285   assert(TLI.has(TheLibFunc) &&
1286          "Creating call to non-existing library function.");
1287   StringRef Name = TLI.getName(TheLibFunc);
1288   FunctionCallee C = M->getOrInsertFunction(Name, T, AttributeList);
1289 
1290   // Make sure any mandatory argument attributes are added.
1291 
1292   // Any outgoing i32 argument should be handled with setArgExtAttr() which
1293   // will add an extension attribute if the target ABI requires it. Adding
1294   // argument extensions is typically done by the front end but when an
1295   // optimizer is building a library call on its own it has to take care of
1296   // this. Each such generated function must be handled here with sign or
1297   // zero extensions as needed.  F is retreived with cast<> because we demand
1298   // of the caller to have called isLibFuncEmittable() first.
1299   Function *F = cast<Function>(C.getCallee());
1300   assert(F->getFunctionType() == T && "Function type does not match.");
1301   switch (TheLibFunc) {
1302   case LibFunc_fputc:
1303   case LibFunc_putchar:
1304     setArgExtAttr(*F, 0, TLI);
1305     break;
1306   case LibFunc_ldexp:
1307   case LibFunc_ldexpf:
1308   case LibFunc_ldexpl:
1309   case LibFunc_memchr:
1310   case LibFunc_memrchr:
1311   case LibFunc_strchr:
1312     setArgExtAttr(*F, 1, TLI);
1313     break;
1314   case LibFunc_memccpy:
1315     setArgExtAttr(*F, 2, TLI);
1316     break;
1317 
1318     // These are functions that are known to not need any argument extension
1319     // on any target: A size_t argument (which may be an i32 on some targets)
1320     // should not trigger the assert below.
1321   case LibFunc_bcmp:
1322   case LibFunc_calloc:
1323   case LibFunc_fwrite:
1324   case LibFunc_malloc:
1325   case LibFunc_memcmp:
1326   case LibFunc_memcpy_chk:
1327   case LibFunc_mempcpy:
1328   case LibFunc_memset_pattern16:
1329   case LibFunc_snprintf:
1330   case LibFunc_stpncpy:
1331   case LibFunc_strlcat:
1332   case LibFunc_strlcpy:
1333   case LibFunc_strncat:
1334   case LibFunc_strncmp:
1335   case LibFunc_strncpy:
1336   case LibFunc_vsnprintf:
1337     break;
1338 
1339   default:
1340 #ifndef NDEBUG
1341     for (unsigned i = 0; i < T->getNumParams(); i++)
1342       assert(!isa<IntegerType>(T->getParamType(i)) &&
1343              "Unhandled integer argument.");
1344 #endif
1345     break;
1346   }
1347 
1348   markRegisterParameterAttributes(F);
1349 
1350   return C;
1351 }
1352 
1353 FunctionCallee llvm::getOrInsertLibFunc(Module *M, const TargetLibraryInfo &TLI,
1354                                         LibFunc TheLibFunc, FunctionType *T) {
1355   return getOrInsertLibFunc(M, TLI, TheLibFunc, T, AttributeList());
1356 }
1357 
1358 bool llvm::isLibFuncEmittable(const Module *M, const TargetLibraryInfo *TLI,
1359                               LibFunc TheLibFunc) {
1360   StringRef FuncName = TLI->getName(TheLibFunc);
1361   if (!TLI->has(TheLibFunc))
1362     return false;
1363 
1364   // Check if the Module already has a GlobalValue with the same name, in
1365   // which case it must be a Function with the expected type.
1366   if (GlobalValue *GV = M->getNamedValue(FuncName)) {
1367     if (auto *F = dyn_cast<Function>(GV))
1368       return TLI->isValidProtoForLibFunc(*F->getFunctionType(), TheLibFunc, *M);
1369     return false;
1370   }
1371 
1372   return true;
1373 }
1374 
1375 bool llvm::isLibFuncEmittable(const Module *M, const TargetLibraryInfo *TLI,
1376                               StringRef Name) {
1377   LibFunc TheLibFunc;
1378   return TLI->getLibFunc(Name, TheLibFunc) &&
1379          isLibFuncEmittable(M, TLI, TheLibFunc);
1380 }
1381 
1382 bool llvm::hasFloatFn(const Module *M, const TargetLibraryInfo *TLI, Type *Ty,
1383                       LibFunc DoubleFn, LibFunc FloatFn, LibFunc LongDoubleFn) {
1384   switch (Ty->getTypeID()) {
1385   case Type::HalfTyID:
1386     return false;
1387   case Type::FloatTyID:
1388     return isLibFuncEmittable(M, TLI, FloatFn);
1389   case Type::DoubleTyID:
1390     return isLibFuncEmittable(M, TLI, DoubleFn);
1391   default:
1392     return isLibFuncEmittable(M, TLI, LongDoubleFn);
1393   }
1394 }
1395 
1396 StringRef llvm::getFloatFn(const Module *M, const TargetLibraryInfo *TLI,
1397                            Type *Ty, LibFunc DoubleFn, LibFunc FloatFn,
1398                            LibFunc LongDoubleFn, LibFunc &TheLibFunc) {
1399   assert(hasFloatFn(M, TLI, Ty, DoubleFn, FloatFn, LongDoubleFn) &&
1400          "Cannot get name for unavailable function!");
1401 
1402   switch (Ty->getTypeID()) {
1403   case Type::HalfTyID:
1404     llvm_unreachable("No name for HalfTy!");
1405   case Type::FloatTyID:
1406     TheLibFunc = FloatFn;
1407     return TLI->getName(FloatFn);
1408   case Type::DoubleTyID:
1409     TheLibFunc = DoubleFn;
1410     return TLI->getName(DoubleFn);
1411   default:
1412     TheLibFunc = LongDoubleFn;
1413     return TLI->getName(LongDoubleFn);
1414   }
1415 }
1416 
1417 //- Emit LibCalls ------------------------------------------------------------//
1418 
1419 Value *llvm::castToCStr(Value *V, IRBuilderBase &B) {
1420   unsigned AS = V->getType()->getPointerAddressSpace();
1421   return B.CreateBitCast(V, B.getInt8PtrTy(AS), "cstr");
1422 }
1423 
1424 static Value *emitLibCall(LibFunc TheLibFunc, Type *ReturnType,
1425                           ArrayRef<Type *> ParamTypes,
1426                           ArrayRef<Value *> Operands, IRBuilderBase &B,
1427                           const TargetLibraryInfo *TLI,
1428                           bool IsVaArgs = false) {
1429   Module *M = B.GetInsertBlock()->getModule();
1430   if (!isLibFuncEmittable(M, TLI, TheLibFunc))
1431     return nullptr;
1432 
1433   StringRef FuncName = TLI->getName(TheLibFunc);
1434   FunctionType *FuncType = FunctionType::get(ReturnType, ParamTypes, IsVaArgs);
1435   FunctionCallee Callee = getOrInsertLibFunc(M, *TLI, TheLibFunc, FuncType);
1436   inferNonMandatoryLibFuncAttrs(M, FuncName, *TLI);
1437   CallInst *CI = B.CreateCall(Callee, Operands, FuncName);
1438   if (const Function *F =
1439           dyn_cast<Function>(Callee.getCallee()->stripPointerCasts()))
1440     CI->setCallingConv(F->getCallingConv());
1441   return CI;
1442 }
1443 
1444 Value *llvm::emitStrLen(Value *Ptr, IRBuilderBase &B, const DataLayout &DL,
1445                         const TargetLibraryInfo *TLI) {
1446   LLVMContext &Context = B.GetInsertBlock()->getContext();
1447   return emitLibCall(LibFunc_strlen, DL.getIntPtrType(Context),
1448                      B.getInt8PtrTy(), castToCStr(Ptr, B), B, TLI);
1449 }
1450 
1451 Value *llvm::emitStrDup(Value *Ptr, IRBuilderBase &B,
1452                         const TargetLibraryInfo *TLI) {
1453   return emitLibCall(LibFunc_strdup, B.getInt8PtrTy(), B.getInt8PtrTy(),
1454                      castToCStr(Ptr, B), B, TLI);
1455 }
1456 
1457 Value *llvm::emitStrChr(Value *Ptr, char C, IRBuilderBase &B,
1458                         const TargetLibraryInfo *TLI) {
1459   Type *I8Ptr = B.getInt8PtrTy();
1460   Type *I32Ty = B.getInt32Ty();
1461   return emitLibCall(LibFunc_strchr, I8Ptr, {I8Ptr, I32Ty},
1462                      {castToCStr(Ptr, B), ConstantInt::get(I32Ty, C)}, B, TLI);
1463 }
1464 
1465 Value *llvm::emitStrNCmp(Value *Ptr1, Value *Ptr2, Value *Len, IRBuilderBase &B,
1466                          const DataLayout &DL, const TargetLibraryInfo *TLI) {
1467   LLVMContext &Context = B.GetInsertBlock()->getContext();
1468   return emitLibCall(
1469       LibFunc_strncmp, B.getInt32Ty(),
1470       {B.getInt8PtrTy(), B.getInt8PtrTy(), DL.getIntPtrType(Context)},
1471       {castToCStr(Ptr1, B), castToCStr(Ptr2, B), Len}, B, TLI);
1472 }
1473 
1474 Value *llvm::emitStrCpy(Value *Dst, Value *Src, IRBuilderBase &B,
1475                         const TargetLibraryInfo *TLI) {
1476   Type *I8Ptr = Dst->getType();
1477   return emitLibCall(LibFunc_strcpy, I8Ptr, {I8Ptr, I8Ptr},
1478                      {castToCStr(Dst, B), castToCStr(Src, B)}, B, TLI);
1479 }
1480 
1481 Value *llvm::emitStpCpy(Value *Dst, Value *Src, IRBuilderBase &B,
1482                         const TargetLibraryInfo *TLI) {
1483   Type *I8Ptr = B.getInt8PtrTy();
1484   return emitLibCall(LibFunc_stpcpy, I8Ptr, {I8Ptr, I8Ptr},
1485                      {castToCStr(Dst, B), castToCStr(Src, B)}, B, TLI);
1486 }
1487 
1488 Value *llvm::emitStrNCpy(Value *Dst, Value *Src, Value *Len, IRBuilderBase &B,
1489                          const TargetLibraryInfo *TLI) {
1490   Type *I8Ptr = B.getInt8PtrTy();
1491   return emitLibCall(LibFunc_strncpy, I8Ptr, {I8Ptr, I8Ptr, Len->getType()},
1492                      {castToCStr(Dst, B), castToCStr(Src, B), Len}, B, TLI);
1493 }
1494 
1495 Value *llvm::emitStpNCpy(Value *Dst, Value *Src, Value *Len, IRBuilderBase &B,
1496                          const TargetLibraryInfo *TLI) {
1497   Type *I8Ptr = B.getInt8PtrTy();
1498   return emitLibCall(LibFunc_stpncpy, I8Ptr, {I8Ptr, I8Ptr, Len->getType()},
1499                      {castToCStr(Dst, B), castToCStr(Src, B), Len}, B, TLI);
1500 }
1501 
1502 Value *llvm::emitMemCpyChk(Value *Dst, Value *Src, Value *Len, Value *ObjSize,
1503                            IRBuilderBase &B, const DataLayout &DL,
1504                            const TargetLibraryInfo *TLI) {
1505   Module *M = B.GetInsertBlock()->getModule();
1506   if (!isLibFuncEmittable(M, TLI, LibFunc_memcpy_chk))
1507     return nullptr;
1508 
1509   AttributeList AS;
1510   AS = AttributeList::get(M->getContext(), AttributeList::FunctionIndex,
1511                           Attribute::NoUnwind);
1512   LLVMContext &Context = B.GetInsertBlock()->getContext();
1513   FunctionCallee MemCpy = getOrInsertLibFunc(M, *TLI, LibFunc_memcpy_chk,
1514       AttributeList::get(M->getContext(), AS), B.getInt8PtrTy(),
1515       B.getInt8PtrTy(), B.getInt8PtrTy(), DL.getIntPtrType(Context),
1516       DL.getIntPtrType(Context));
1517   Dst = castToCStr(Dst, B);
1518   Src = castToCStr(Src, B);
1519   CallInst *CI = B.CreateCall(MemCpy, {Dst, Src, Len, ObjSize});
1520   if (const Function *F =
1521           dyn_cast<Function>(MemCpy.getCallee()->stripPointerCasts()))
1522     CI->setCallingConv(F->getCallingConv());
1523   return CI;
1524 }
1525 
1526 Value *llvm::emitMemPCpy(Value *Dst, Value *Src, Value *Len, IRBuilderBase &B,
1527                          const DataLayout &DL, const TargetLibraryInfo *TLI) {
1528   LLVMContext &Context = B.GetInsertBlock()->getContext();
1529   return emitLibCall(
1530       LibFunc_mempcpy, B.getInt8PtrTy(),
1531       {B.getInt8PtrTy(), B.getInt8PtrTy(), DL.getIntPtrType(Context)},
1532       {Dst, Src, Len}, B, TLI);
1533 }
1534 
1535 Value *llvm::emitMemChr(Value *Ptr, Value *Val, Value *Len, IRBuilderBase &B,
1536                         const DataLayout &DL, const TargetLibraryInfo *TLI) {
1537   LLVMContext &Context = B.GetInsertBlock()->getContext();
1538   return emitLibCall(
1539       LibFunc_memchr, B.getInt8PtrTy(),
1540       {B.getInt8PtrTy(), B.getInt32Ty(), DL.getIntPtrType(Context)},
1541       {castToCStr(Ptr, B), Val, Len}, B, TLI);
1542 }
1543 
1544 Value *llvm::emitMemRChr(Value *Ptr, Value *Val, Value *Len, IRBuilderBase &B,
1545                         const DataLayout &DL, const TargetLibraryInfo *TLI) {
1546   LLVMContext &Context = B.GetInsertBlock()->getContext();
1547   return emitLibCall(
1548       LibFunc_memrchr, B.getInt8PtrTy(),
1549       {B.getInt8PtrTy(), B.getInt32Ty(), DL.getIntPtrType(Context)},
1550       {castToCStr(Ptr, B), Val, Len}, B, TLI);
1551 }
1552 
1553 Value *llvm::emitMemCmp(Value *Ptr1, Value *Ptr2, Value *Len, IRBuilderBase &B,
1554                         const DataLayout &DL, const TargetLibraryInfo *TLI) {
1555   LLVMContext &Context = B.GetInsertBlock()->getContext();
1556   return emitLibCall(
1557       LibFunc_memcmp, B.getInt32Ty(),
1558       {B.getInt8PtrTy(), B.getInt8PtrTy(), DL.getIntPtrType(Context)},
1559       {castToCStr(Ptr1, B), castToCStr(Ptr2, B), Len}, B, TLI);
1560 }
1561 
1562 Value *llvm::emitBCmp(Value *Ptr1, Value *Ptr2, Value *Len, IRBuilderBase &B,
1563                       const DataLayout &DL, const TargetLibraryInfo *TLI) {
1564   LLVMContext &Context = B.GetInsertBlock()->getContext();
1565   return emitLibCall(
1566       LibFunc_bcmp, B.getInt32Ty(),
1567       {B.getInt8PtrTy(), B.getInt8PtrTy(), DL.getIntPtrType(Context)},
1568       {castToCStr(Ptr1, B), castToCStr(Ptr2, B), Len}, B, TLI);
1569 }
1570 
1571 Value *llvm::emitMemCCpy(Value *Ptr1, Value *Ptr2, Value *Val, Value *Len,
1572                          IRBuilderBase &B, const TargetLibraryInfo *TLI) {
1573   return emitLibCall(
1574       LibFunc_memccpy, B.getInt8PtrTy(),
1575       {B.getInt8PtrTy(), B.getInt8PtrTy(), B.getInt32Ty(), Len->getType()},
1576       {Ptr1, Ptr2, Val, Len}, B, TLI);
1577 }
1578 
1579 Value *llvm::emitSNPrintf(Value *Dest, Value *Size, Value *Fmt,
1580                           ArrayRef<Value *> VariadicArgs, IRBuilderBase &B,
1581                           const TargetLibraryInfo *TLI) {
1582   SmallVector<Value *, 8> Args{castToCStr(Dest, B), Size, castToCStr(Fmt, B)};
1583   llvm::append_range(Args, VariadicArgs);
1584   return emitLibCall(LibFunc_snprintf, B.getInt32Ty(),
1585                      {B.getInt8PtrTy(), Size->getType(), B.getInt8PtrTy()},
1586                      Args, B, TLI, /*IsVaArgs=*/true);
1587 }
1588 
1589 Value *llvm::emitSPrintf(Value *Dest, Value *Fmt,
1590                          ArrayRef<Value *> VariadicArgs, IRBuilderBase &B,
1591                          const TargetLibraryInfo *TLI) {
1592   SmallVector<Value *, 8> Args{castToCStr(Dest, B), castToCStr(Fmt, B)};
1593   llvm::append_range(Args, VariadicArgs);
1594   return emitLibCall(LibFunc_sprintf, B.getInt32Ty(),
1595                      {B.getInt8PtrTy(), B.getInt8PtrTy()}, Args, B, TLI,
1596                      /*IsVaArgs=*/true);
1597 }
1598 
1599 Value *llvm::emitStrCat(Value *Dest, Value *Src, IRBuilderBase &B,
1600                         const TargetLibraryInfo *TLI) {
1601   return emitLibCall(LibFunc_strcat, B.getInt8PtrTy(),
1602                      {B.getInt8PtrTy(), B.getInt8PtrTy()},
1603                      {castToCStr(Dest, B), castToCStr(Src, B)}, B, TLI);
1604 }
1605 
1606 Value *llvm::emitStrLCpy(Value *Dest, Value *Src, Value *Size, IRBuilderBase &B,
1607                          const TargetLibraryInfo *TLI) {
1608   return emitLibCall(LibFunc_strlcpy, Size->getType(),
1609                      {B.getInt8PtrTy(), B.getInt8PtrTy(), Size->getType()},
1610                      {castToCStr(Dest, B), castToCStr(Src, B), Size}, B, TLI);
1611 }
1612 
1613 Value *llvm::emitStrLCat(Value *Dest, Value *Src, Value *Size, IRBuilderBase &B,
1614                          const TargetLibraryInfo *TLI) {
1615   return emitLibCall(LibFunc_strlcat, Size->getType(),
1616                      {B.getInt8PtrTy(), B.getInt8PtrTy(), Size->getType()},
1617                      {castToCStr(Dest, B), castToCStr(Src, B), Size}, B, TLI);
1618 }
1619 
1620 Value *llvm::emitStrNCat(Value *Dest, Value *Src, Value *Size, IRBuilderBase &B,
1621                          const TargetLibraryInfo *TLI) {
1622   return emitLibCall(LibFunc_strncat, B.getInt8PtrTy(),
1623                      {B.getInt8PtrTy(), B.getInt8PtrTy(), Size->getType()},
1624                      {castToCStr(Dest, B), castToCStr(Src, B), Size}, B, TLI);
1625 }
1626 
1627 Value *llvm::emitVSNPrintf(Value *Dest, Value *Size, Value *Fmt, Value *VAList,
1628                            IRBuilderBase &B, const TargetLibraryInfo *TLI) {
1629   return emitLibCall(
1630       LibFunc_vsnprintf, B.getInt32Ty(),
1631       {B.getInt8PtrTy(), Size->getType(), B.getInt8PtrTy(), VAList->getType()},
1632       {castToCStr(Dest, B), Size, castToCStr(Fmt, B), VAList}, B, TLI);
1633 }
1634 
1635 Value *llvm::emitVSPrintf(Value *Dest, Value *Fmt, Value *VAList,
1636                           IRBuilderBase &B, const TargetLibraryInfo *TLI) {
1637   return emitLibCall(LibFunc_vsprintf, B.getInt32Ty(),
1638                      {B.getInt8PtrTy(), B.getInt8PtrTy(), VAList->getType()},
1639                      {castToCStr(Dest, B), castToCStr(Fmt, B), VAList}, B, TLI);
1640 }
1641 
1642 /// Append a suffix to the function name according to the type of 'Op'.
1643 static void appendTypeSuffix(Value *Op, StringRef &Name,
1644                              SmallString<20> &NameBuffer) {
1645   if (!Op->getType()->isDoubleTy()) {
1646       NameBuffer += Name;
1647 
1648     if (Op->getType()->isFloatTy())
1649       NameBuffer += 'f';
1650     else
1651       NameBuffer += 'l';
1652 
1653     Name = NameBuffer;
1654   }
1655 }
1656 
1657 static Value *emitUnaryFloatFnCallHelper(Value *Op, LibFunc TheLibFunc,
1658                                          StringRef Name, IRBuilderBase &B,
1659                                          const AttributeList &Attrs,
1660                                          const TargetLibraryInfo *TLI) {
1661   assert((Name != "") && "Must specify Name to emitUnaryFloatFnCall");
1662 
1663   Module *M = B.GetInsertBlock()->getModule();
1664   FunctionCallee Callee = getOrInsertLibFunc(M, *TLI, TheLibFunc, Op->getType(),
1665                                              Op->getType());
1666   CallInst *CI = B.CreateCall(Callee, Op, Name);
1667 
1668   // The incoming attribute set may have come from a speculatable intrinsic, but
1669   // is being replaced with a library call which is not allowed to be
1670   // speculatable.
1671   CI->setAttributes(
1672       Attrs.removeFnAttribute(B.getContext(), Attribute::Speculatable));
1673   if (const Function *F =
1674           dyn_cast<Function>(Callee.getCallee()->stripPointerCasts()))
1675     CI->setCallingConv(F->getCallingConv());
1676 
1677   return CI;
1678 }
1679 
1680 Value *llvm::emitUnaryFloatFnCall(Value *Op, const TargetLibraryInfo *TLI,
1681                                   StringRef Name, IRBuilderBase &B,
1682                                   const AttributeList &Attrs) {
1683   SmallString<20> NameBuffer;
1684   appendTypeSuffix(Op, Name, NameBuffer);
1685 
1686   LibFunc TheLibFunc;
1687   TLI->getLibFunc(Name, TheLibFunc);
1688 
1689   return emitUnaryFloatFnCallHelper(Op, TheLibFunc, Name, B, Attrs, TLI);
1690 }
1691 
1692 Value *llvm::emitUnaryFloatFnCall(Value *Op, const TargetLibraryInfo *TLI,
1693                                   LibFunc DoubleFn, LibFunc FloatFn,
1694                                   LibFunc LongDoubleFn, IRBuilderBase &B,
1695                                   const AttributeList &Attrs) {
1696   // Get the name of the function according to TLI.
1697   Module *M = B.GetInsertBlock()->getModule();
1698   LibFunc TheLibFunc;
1699   StringRef Name = getFloatFn(M, TLI, Op->getType(), DoubleFn, FloatFn,
1700                               LongDoubleFn, TheLibFunc);
1701 
1702   return emitUnaryFloatFnCallHelper(Op, TheLibFunc, Name, B, Attrs, TLI);
1703 }
1704 
1705 static Value *emitBinaryFloatFnCallHelper(Value *Op1, Value *Op2,
1706                                           LibFunc TheLibFunc,
1707                                           StringRef Name, IRBuilderBase &B,
1708                                           const AttributeList &Attrs,
1709                                           const TargetLibraryInfo *TLI) {
1710   assert((Name != "") && "Must specify Name to emitBinaryFloatFnCall");
1711 
1712   Module *M = B.GetInsertBlock()->getModule();
1713   FunctionCallee Callee = getOrInsertLibFunc(M, *TLI, TheLibFunc, Op1->getType(),
1714                                              Op1->getType(), Op2->getType());
1715   inferNonMandatoryLibFuncAttrs(M, Name, *TLI);
1716   CallInst *CI = B.CreateCall(Callee, { Op1, Op2 }, Name);
1717 
1718   // The incoming attribute set may have come from a speculatable intrinsic, but
1719   // is being replaced with a library call which is not allowed to be
1720   // speculatable.
1721   CI->setAttributes(
1722       Attrs.removeFnAttribute(B.getContext(), Attribute::Speculatable));
1723   if (const Function *F =
1724           dyn_cast<Function>(Callee.getCallee()->stripPointerCasts()))
1725     CI->setCallingConv(F->getCallingConv());
1726 
1727   return CI;
1728 }
1729 
1730 Value *llvm::emitBinaryFloatFnCall(Value *Op1, Value *Op2,
1731                                    const TargetLibraryInfo *TLI,
1732                                    StringRef Name, IRBuilderBase &B,
1733                                    const AttributeList &Attrs) {
1734   assert((Name != "") && "Must specify Name to emitBinaryFloatFnCall");
1735 
1736   SmallString<20> NameBuffer;
1737   appendTypeSuffix(Op1, Name, NameBuffer);
1738 
1739   LibFunc TheLibFunc;
1740   TLI->getLibFunc(Name, TheLibFunc);
1741 
1742   return emitBinaryFloatFnCallHelper(Op1, Op2, TheLibFunc, Name, B, Attrs, TLI);
1743 }
1744 
1745 Value *llvm::emitBinaryFloatFnCall(Value *Op1, Value *Op2,
1746                                    const TargetLibraryInfo *TLI,
1747                                    LibFunc DoubleFn, LibFunc FloatFn,
1748                                    LibFunc LongDoubleFn, IRBuilderBase &B,
1749                                    const AttributeList &Attrs) {
1750   // Get the name of the function according to TLI.
1751   Module *M = B.GetInsertBlock()->getModule();
1752   LibFunc TheLibFunc;
1753   StringRef Name = getFloatFn(M, TLI, Op1->getType(), DoubleFn, FloatFn,
1754                               LongDoubleFn, TheLibFunc);
1755 
1756   return emitBinaryFloatFnCallHelper(Op1, Op2, TheLibFunc, Name, B, Attrs, TLI);
1757 }
1758 
1759 Value *llvm::emitPutChar(Value *Char, IRBuilderBase &B,
1760                          const TargetLibraryInfo *TLI) {
1761   Module *M = B.GetInsertBlock()->getModule();
1762   if (!isLibFuncEmittable(M, TLI, LibFunc_putchar))
1763     return nullptr;
1764 
1765   StringRef PutCharName = TLI->getName(LibFunc_putchar);
1766   FunctionCallee PutChar = getOrInsertLibFunc(M, *TLI, LibFunc_putchar,
1767                                               B.getInt32Ty(), B.getInt32Ty());
1768   inferNonMandatoryLibFuncAttrs(M, PutCharName, *TLI);
1769   CallInst *CI = B.CreateCall(PutChar,
1770                               B.CreateIntCast(Char,
1771                               B.getInt32Ty(),
1772                               /*isSigned*/true,
1773                               "chari"),
1774                               PutCharName);
1775 
1776   if (const Function *F =
1777           dyn_cast<Function>(PutChar.getCallee()->stripPointerCasts()))
1778     CI->setCallingConv(F->getCallingConv());
1779   return CI;
1780 }
1781 
1782 Value *llvm::emitPutS(Value *Str, IRBuilderBase &B,
1783                       const TargetLibraryInfo *TLI) {
1784   Module *M = B.GetInsertBlock()->getModule();
1785   if (!isLibFuncEmittable(M, TLI, LibFunc_puts))
1786     return nullptr;
1787 
1788   StringRef PutsName = TLI->getName(LibFunc_puts);
1789   FunctionCallee PutS = getOrInsertLibFunc(M, *TLI, LibFunc_puts, B.getInt32Ty(),
1790                                            B.getInt8PtrTy());
1791   inferNonMandatoryLibFuncAttrs(M, PutsName, *TLI);
1792   CallInst *CI = B.CreateCall(PutS, castToCStr(Str, B), PutsName);
1793   if (const Function *F =
1794           dyn_cast<Function>(PutS.getCallee()->stripPointerCasts()))
1795     CI->setCallingConv(F->getCallingConv());
1796   return CI;
1797 }
1798 
1799 Value *llvm::emitFPutC(Value *Char, Value *File, IRBuilderBase &B,
1800                        const TargetLibraryInfo *TLI) {
1801   Module *M = B.GetInsertBlock()->getModule();
1802   if (!isLibFuncEmittable(M, TLI, LibFunc_fputc))
1803     return nullptr;
1804 
1805   StringRef FPutcName = TLI->getName(LibFunc_fputc);
1806   FunctionCallee F = getOrInsertLibFunc(M, *TLI, LibFunc_fputc, B.getInt32Ty(),
1807                                         B.getInt32Ty(), File->getType());
1808   if (File->getType()->isPointerTy())
1809     inferNonMandatoryLibFuncAttrs(M, FPutcName, *TLI);
1810   Char = B.CreateIntCast(Char, B.getInt32Ty(), /*isSigned*/true,
1811                          "chari");
1812   CallInst *CI = B.CreateCall(F, {Char, File}, FPutcName);
1813 
1814   if (const Function *Fn =
1815           dyn_cast<Function>(F.getCallee()->stripPointerCasts()))
1816     CI->setCallingConv(Fn->getCallingConv());
1817   return CI;
1818 }
1819 
1820 Value *llvm::emitFPutS(Value *Str, Value *File, IRBuilderBase &B,
1821                        const TargetLibraryInfo *TLI) {
1822   Module *M = B.GetInsertBlock()->getModule();
1823   if (!isLibFuncEmittable(M, TLI, LibFunc_fputs))
1824     return nullptr;
1825 
1826   StringRef FPutsName = TLI->getName(LibFunc_fputs);
1827   FunctionCallee F = getOrInsertLibFunc(M, *TLI, LibFunc_fputs, B.getInt32Ty(),
1828                                         B.getInt8PtrTy(), File->getType());
1829   if (File->getType()->isPointerTy())
1830     inferNonMandatoryLibFuncAttrs(M, FPutsName, *TLI);
1831   CallInst *CI = B.CreateCall(F, {castToCStr(Str, B), File}, FPutsName);
1832 
1833   if (const Function *Fn =
1834           dyn_cast<Function>(F.getCallee()->stripPointerCasts()))
1835     CI->setCallingConv(Fn->getCallingConv());
1836   return CI;
1837 }
1838 
1839 Value *llvm::emitFWrite(Value *Ptr, Value *Size, Value *File, IRBuilderBase &B,
1840                         const DataLayout &DL, const TargetLibraryInfo *TLI) {
1841   Module *M = B.GetInsertBlock()->getModule();
1842   if (!isLibFuncEmittable(M, TLI, LibFunc_fwrite))
1843     return nullptr;
1844 
1845   LLVMContext &Context = B.GetInsertBlock()->getContext();
1846   StringRef FWriteName = TLI->getName(LibFunc_fwrite);
1847   FunctionCallee F = getOrInsertLibFunc(M, *TLI, LibFunc_fwrite,
1848        DL.getIntPtrType(Context), B.getInt8PtrTy(), DL.getIntPtrType(Context),
1849        DL.getIntPtrType(Context), File->getType());
1850 
1851   if (File->getType()->isPointerTy())
1852     inferNonMandatoryLibFuncAttrs(M, FWriteName, *TLI);
1853   CallInst *CI =
1854       B.CreateCall(F, {castToCStr(Ptr, B), Size,
1855                        ConstantInt::get(DL.getIntPtrType(Context), 1), File});
1856 
1857   if (const Function *Fn =
1858           dyn_cast<Function>(F.getCallee()->stripPointerCasts()))
1859     CI->setCallingConv(Fn->getCallingConv());
1860   return CI;
1861 }
1862 
1863 Value *llvm::emitMalloc(Value *Num, IRBuilderBase &B, const DataLayout &DL,
1864                         const TargetLibraryInfo *TLI) {
1865   Module *M = B.GetInsertBlock()->getModule();
1866   if (!isLibFuncEmittable(M, TLI, LibFunc_malloc))
1867     return nullptr;
1868 
1869   StringRef MallocName = TLI->getName(LibFunc_malloc);
1870   LLVMContext &Context = B.GetInsertBlock()->getContext();
1871   FunctionCallee Malloc = getOrInsertLibFunc(M, *TLI, LibFunc_malloc,
1872                                  B.getInt8PtrTy(), DL.getIntPtrType(Context));
1873   inferNonMandatoryLibFuncAttrs(M, MallocName, *TLI);
1874   CallInst *CI = B.CreateCall(Malloc, Num, MallocName);
1875 
1876   if (const Function *F =
1877           dyn_cast<Function>(Malloc.getCallee()->stripPointerCasts()))
1878     CI->setCallingConv(F->getCallingConv());
1879 
1880   return CI;
1881 }
1882 
1883 Value *llvm::emitCalloc(Value *Num, Value *Size, IRBuilderBase &B,
1884                         const TargetLibraryInfo &TLI) {
1885   Module *M = B.GetInsertBlock()->getModule();
1886   if (!isLibFuncEmittable(M, &TLI, LibFunc_calloc))
1887     return nullptr;
1888 
1889   StringRef CallocName = TLI.getName(LibFunc_calloc);
1890   const DataLayout &DL = M->getDataLayout();
1891   IntegerType *PtrType = DL.getIntPtrType((B.GetInsertBlock()->getContext()));
1892   FunctionCallee Calloc = getOrInsertLibFunc(M, TLI, LibFunc_calloc,
1893                                              B.getInt8PtrTy(), PtrType, PtrType);
1894   inferNonMandatoryLibFuncAttrs(M, CallocName, TLI);
1895   CallInst *CI = B.CreateCall(Calloc, {Num, Size}, CallocName);
1896 
1897   if (const auto *F =
1898           dyn_cast<Function>(Calloc.getCallee()->stripPointerCasts()))
1899     CI->setCallingConv(F->getCallingConv());
1900 
1901   return CI;
1902 }
1903