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