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