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.hasRetAttribute(Attribute::NoAlias))
100     return false;
101   F.addRetAttr(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.hasRetAttribute(Attribute::NoUndef)) {
149     F.addRetAttr(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   bool UndefAdded = false;
178   UndefAdded |= setRetNoUndef(F);
179   UndefAdded |= setArgsNoUndef(F);
180   return UndefAdded;
181 }
182 
183 static bool setReturnedArg(Function &F, unsigned ArgNo) {
184   if (F.hasParamAttribute(ArgNo, Attribute::Returned))
185     return false;
186   F.addParamAttr(ArgNo, Attribute::Returned);
187   ++NumReturnedArg;
188   return true;
189 }
190 
191 static bool setNonLazyBind(Function &F) {
192   if (F.hasFnAttribute(Attribute::NonLazyBind))
193     return false;
194   F.addFnAttr(Attribute::NonLazyBind);
195   return true;
196 }
197 
198 static bool setDoesNotFreeMemory(Function &F) {
199   if (F.hasFnAttribute(Attribute::NoFree))
200     return false;
201   F.addFnAttr(Attribute::NoFree);
202   return true;
203 }
204 
205 static bool setWillReturn(Function &F) {
206   if (F.hasFnAttribute(Attribute::WillReturn))
207     return false;
208   F.addFnAttr(Attribute::WillReturn);
209   ++NumWillReturn;
210   return true;
211 }
212 
213 bool llvm::inferLibFuncAttributes(Module *M, StringRef Name,
214                                   const TargetLibraryInfo &TLI) {
215   Function *F = M->getFunction(Name);
216   if (!F)
217     return false;
218   return inferLibFuncAttributes(*F, TLI);
219 }
220 
221 bool llvm::inferLibFuncAttributes(Function &F, const TargetLibraryInfo &TLI) {
222   LibFunc TheLibFunc;
223   if (!(TLI.getLibFunc(F, TheLibFunc) && TLI.has(TheLibFunc)))
224     return false;
225 
226   bool Changed = false;
227 
228   if(!isLibFreeFunction(&F, TheLibFunc) && !isReallocLikeFn(&F,  &TLI))
229     Changed |= setDoesNotFreeMemory(F);
230 
231   if (F.getParent() != nullptr && F.getParent()->getRtLibUseGOT())
232     Changed |= setNonLazyBind(F);
233 
234   switch (TheLibFunc) {
235   case LibFunc_strlen:
236   case LibFunc_wcslen:
237     Changed |= setOnlyReadsMemory(F);
238     Changed |= setDoesNotThrow(F);
239     Changed |= setOnlyAccessesArgMemory(F);
240     Changed |= setWillReturn(F);
241     Changed |= setDoesNotCapture(F, 0);
242     return Changed;
243   case LibFunc_strchr:
244   case LibFunc_strrchr:
245     Changed |= setOnlyAccessesArgMemory(F);
246     Changed |= setOnlyReadsMemory(F);
247     Changed |= setDoesNotThrow(F);
248     Changed |= setWillReturn(F);
249     return Changed;
250   case LibFunc_strtol:
251   case LibFunc_strtod:
252   case LibFunc_strtof:
253   case LibFunc_strtoul:
254   case LibFunc_strtoll:
255   case LibFunc_strtold:
256   case LibFunc_strtoull:
257     Changed |= setDoesNotThrow(F);
258     Changed |= setWillReturn(F);
259     Changed |= setDoesNotCapture(F, 1);
260     Changed |= setOnlyReadsMemory(F, 0);
261     return Changed;
262   case LibFunc_strcat:
263   case LibFunc_strncat:
264     Changed |= setOnlyAccessesArgMemory(F);
265     Changed |= setDoesNotThrow(F);
266     Changed |= setWillReturn(F);
267     Changed |= setReturnedArg(F, 0);
268     Changed |= setDoesNotCapture(F, 1);
269     Changed |= setOnlyReadsMemory(F, 1);
270     Changed |= setDoesNotAlias(F, 0);
271     Changed |= setDoesNotAlias(F, 1);
272     return Changed;
273   case LibFunc_strcpy:
274   case LibFunc_strncpy:
275     Changed |= setReturnedArg(F, 0);
276     LLVM_FALLTHROUGH;
277   case LibFunc_stpcpy:
278   case LibFunc_stpncpy:
279     Changed |= setOnlyAccessesArgMemory(F);
280     Changed |= setDoesNotThrow(F);
281     Changed |= setWillReturn(F);
282     Changed |= setDoesNotCapture(F, 1);
283     Changed |= setOnlyWritesMemory(F, 0);
284     Changed |= setOnlyReadsMemory(F, 1);
285     Changed |= setDoesNotAlias(F, 0);
286     Changed |= setDoesNotAlias(F, 1);
287     return Changed;
288   case LibFunc_strxfrm:
289     Changed |= setDoesNotThrow(F);
290     Changed |= setWillReturn(F);
291     Changed |= setDoesNotCapture(F, 0);
292     Changed |= setDoesNotCapture(F, 1);
293     Changed |= setOnlyReadsMemory(F, 1);
294     return Changed;
295   case LibFunc_strcmp:      // 0,1
296   case LibFunc_strspn:      // 0,1
297   case LibFunc_strncmp:     // 0,1
298   case LibFunc_strcspn:     // 0,1
299     Changed |= setDoesNotThrow(F);
300     Changed |= setOnlyAccessesArgMemory(F);
301     Changed |= setWillReturn(F);
302     Changed |= setOnlyReadsMemory(F);
303     Changed |= setDoesNotCapture(F, 0);
304     Changed |= setDoesNotCapture(F, 1);
305     return Changed;
306   case LibFunc_strcoll:
307   case LibFunc_strcasecmp:  // 0,1
308   case LibFunc_strncasecmp: //
309     // Those functions may depend on the locale, which may be accessed through
310     // global memory.
311     Changed |= setOnlyReadsMemory(F);
312     Changed |= setDoesNotThrow(F);
313     Changed |= setWillReturn(F);
314     Changed |= setDoesNotCapture(F, 0);
315     Changed |= setDoesNotCapture(F, 1);
316     return Changed;
317   case LibFunc_strstr:
318   case LibFunc_strpbrk:
319     Changed |= setOnlyAccessesArgMemory(F);
320     Changed |= setOnlyReadsMemory(F);
321     Changed |= setDoesNotThrow(F);
322     Changed |= setWillReturn(F);
323     Changed |= setDoesNotCapture(F, 1);
324     return Changed;
325   case LibFunc_strtok:
326   case LibFunc_strtok_r:
327     Changed |= setDoesNotThrow(F);
328     Changed |= setWillReturn(F);
329     Changed |= setDoesNotCapture(F, 1);
330     Changed |= setOnlyReadsMemory(F, 1);
331     return Changed;
332   case LibFunc_scanf:
333     Changed |= setRetAndArgsNoUndef(F);
334     Changed |= setDoesNotThrow(F);
335     Changed |= setDoesNotCapture(F, 0);
336     Changed |= setOnlyReadsMemory(F, 0);
337     return Changed;
338   case LibFunc_setbuf:
339   case LibFunc_setvbuf:
340     Changed |= setRetAndArgsNoUndef(F);
341     Changed |= setDoesNotThrow(F);
342     Changed |= setDoesNotCapture(F, 0);
343     return Changed;
344   case LibFunc_strndup:
345     Changed |= setArgNoUndef(F, 1);
346     LLVM_FALLTHROUGH;
347   case LibFunc_strdup:
348     Changed |= setOnlyAccessesInaccessibleMemOrArgMem(F);
349     Changed |= setDoesNotThrow(F);
350     Changed |= setRetDoesNotAlias(F);
351     Changed |= setWillReturn(F);
352     Changed |= setDoesNotCapture(F, 0);
353     Changed |= setOnlyReadsMemory(F, 0);
354     return Changed;
355   case LibFunc_stat:
356   case LibFunc_statvfs:
357     Changed |= setRetAndArgsNoUndef(F);
358     Changed |= setDoesNotThrow(F);
359     Changed |= setDoesNotCapture(F, 0);
360     Changed |= setDoesNotCapture(F, 1);
361     Changed |= setOnlyReadsMemory(F, 0);
362     return Changed;
363   case LibFunc_sscanf:
364     Changed |= setRetAndArgsNoUndef(F);
365     Changed |= setDoesNotThrow(F);
366     Changed |= setDoesNotCapture(F, 0);
367     Changed |= setDoesNotCapture(F, 1);
368     Changed |= setOnlyReadsMemory(F, 0);
369     Changed |= setOnlyReadsMemory(F, 1);
370     return Changed;
371   case LibFunc_sprintf:
372     Changed |= setRetAndArgsNoUndef(F);
373     Changed |= setDoesNotThrow(F);
374     Changed |= setDoesNotCapture(F, 0);
375     Changed |= setDoesNotAlias(F, 0);
376     Changed |= setOnlyWritesMemory(F, 0);
377     Changed |= setDoesNotCapture(F, 1);
378     Changed |= setOnlyReadsMemory(F, 1);
379     return Changed;
380   case LibFunc_snprintf:
381     Changed |= setRetAndArgsNoUndef(F);
382     Changed |= setDoesNotThrow(F);
383     Changed |= setDoesNotCapture(F, 0);
384     Changed |= setDoesNotAlias(F, 0);
385     Changed |= setOnlyWritesMemory(F, 0);
386     Changed |= setDoesNotCapture(F, 2);
387     Changed |= setOnlyReadsMemory(F, 2);
388     return Changed;
389   case LibFunc_setitimer:
390     Changed |= setRetAndArgsNoUndef(F);
391     Changed |= setDoesNotThrow(F);
392     Changed |= setWillReturn(F);
393     Changed |= setDoesNotCapture(F, 1);
394     Changed |= setDoesNotCapture(F, 2);
395     Changed |= setOnlyReadsMemory(F, 1);
396     return Changed;
397   case LibFunc_system:
398     // May throw; "system" is a valid pthread cancellation point.
399     Changed |= setRetAndArgsNoUndef(F);
400     Changed |= setDoesNotCapture(F, 0);
401     Changed |= setOnlyReadsMemory(F, 0);
402     return Changed;
403   case LibFunc_malloc:
404   case LibFunc_vec_malloc:
405     Changed |= setOnlyAccessesInaccessibleMemory(F);
406     Changed |= setRetAndArgsNoUndef(F);
407     Changed |= setDoesNotThrow(F);
408     Changed |= setRetDoesNotAlias(F);
409     Changed |= setWillReturn(F);
410     return Changed;
411   case LibFunc_memcmp:
412     Changed |= setOnlyAccessesArgMemory(F);
413     Changed |= setOnlyReadsMemory(F);
414     Changed |= setDoesNotThrow(F);
415     Changed |= setWillReturn(F);
416     Changed |= setDoesNotCapture(F, 0);
417     Changed |= setDoesNotCapture(F, 1);
418     return Changed;
419   case LibFunc_memchr:
420   case LibFunc_memrchr:
421     Changed |= setDoesNotThrow(F);
422     Changed |= setOnlyAccessesArgMemory(F);
423     Changed |= setOnlyReadsMemory(F);
424     Changed |= setWillReturn(F);
425     return Changed;
426   case LibFunc_modf:
427   case LibFunc_modff:
428   case LibFunc_modfl:
429     Changed |= setDoesNotThrow(F);
430     Changed |= setWillReturn(F);
431     Changed |= setDoesNotCapture(F, 1);
432     return Changed;
433   case LibFunc_memcpy:
434     Changed |= setDoesNotThrow(F);
435     Changed |= setOnlyAccessesArgMemory(F);
436     Changed |= setWillReturn(F);
437     Changed |= setDoesNotAlias(F, 0);
438     Changed |= setReturnedArg(F, 0);
439     Changed |= setOnlyWritesMemory(F, 0);
440     Changed |= setDoesNotAlias(F, 1);
441     Changed |= setDoesNotCapture(F, 1);
442     Changed |= setOnlyReadsMemory(F, 1);
443     return Changed;
444   case LibFunc_memmove:
445     Changed |= setDoesNotThrow(F);
446     Changed |= setOnlyAccessesArgMemory(F);
447     Changed |= setWillReturn(F);
448     Changed |= setReturnedArg(F, 0);
449     Changed |= setOnlyWritesMemory(F, 0);
450     Changed |= setDoesNotCapture(F, 1);
451     Changed |= setOnlyReadsMemory(F, 1);
452     return Changed;
453   case LibFunc_mempcpy:
454   case LibFunc_memccpy:
455     Changed |= setWillReturn(F);
456     LLVM_FALLTHROUGH;
457   case LibFunc_memcpy_chk:
458     Changed |= setDoesNotThrow(F);
459     Changed |= setOnlyAccessesArgMemory(F);
460     Changed |= setDoesNotAlias(F, 0);
461     Changed |= setOnlyWritesMemory(F, 0);
462     Changed |= setDoesNotAlias(F, 1);
463     Changed |= setDoesNotCapture(F, 1);
464     Changed |= setOnlyReadsMemory(F, 1);
465     return Changed;
466   case LibFunc_memalign:
467     Changed |= setOnlyAccessesInaccessibleMemory(F);
468     Changed |= setRetNoUndef(F);
469     Changed |= setDoesNotThrow(F);
470     Changed |= setRetDoesNotAlias(F);
471     Changed |= setWillReturn(F);
472     return Changed;
473   case LibFunc_mkdir:
474     Changed |= setRetAndArgsNoUndef(F);
475     Changed |= setDoesNotThrow(F);
476     Changed |= setDoesNotCapture(F, 0);
477     Changed |= setOnlyReadsMemory(F, 0);
478     return Changed;
479   case LibFunc_mktime:
480     Changed |= setRetAndArgsNoUndef(F);
481     Changed |= setDoesNotThrow(F);
482     Changed |= setWillReturn(F);
483     Changed |= setDoesNotCapture(F, 0);
484     return Changed;
485   case LibFunc_realloc:
486   case LibFunc_vec_realloc:
487     Changed |= setOnlyAccessesInaccessibleMemOrArgMem(F);
488     Changed |= setRetNoUndef(F);
489     Changed |= setDoesNotThrow(F);
490     Changed |= setRetDoesNotAlias(F);
491     Changed |= setWillReturn(F);
492     Changed |= setDoesNotCapture(F, 0);
493     Changed |= setArgNoUndef(F, 1);
494     return Changed;
495   case LibFunc_reallocf:
496     Changed |= setRetNoUndef(F);
497     Changed |= setWillReturn(F);
498     Changed |= setArgNoUndef(F, 1);
499     return Changed;
500   case LibFunc_read:
501     // May throw; "read" is a valid pthread cancellation point.
502     Changed |= setRetAndArgsNoUndef(F);
503     Changed |= setDoesNotCapture(F, 1);
504     return Changed;
505   case LibFunc_rewind:
506     Changed |= setRetAndArgsNoUndef(F);
507     Changed |= setDoesNotThrow(F);
508     Changed |= setDoesNotCapture(F, 0);
509     return Changed;
510   case LibFunc_rmdir:
511   case LibFunc_remove:
512   case LibFunc_realpath:
513     Changed |= setRetAndArgsNoUndef(F);
514     Changed |= setDoesNotThrow(F);
515     Changed |= setDoesNotCapture(F, 0);
516     Changed |= setOnlyReadsMemory(F, 0);
517     return Changed;
518   case LibFunc_rename:
519     Changed |= setRetAndArgsNoUndef(F);
520     Changed |= setDoesNotThrow(F);
521     Changed |= setDoesNotCapture(F, 0);
522     Changed |= setDoesNotCapture(F, 1);
523     Changed |= setOnlyReadsMemory(F, 0);
524     Changed |= setOnlyReadsMemory(F, 1);
525     return Changed;
526   case LibFunc_readlink:
527     Changed |= setRetAndArgsNoUndef(F);
528     Changed |= setDoesNotThrow(F);
529     Changed |= setDoesNotCapture(F, 0);
530     Changed |= setDoesNotCapture(F, 1);
531     Changed |= setOnlyReadsMemory(F, 0);
532     return Changed;
533   case LibFunc_write:
534     // May throw; "write" is a valid pthread cancellation point.
535     Changed |= setRetAndArgsNoUndef(F);
536     Changed |= setDoesNotCapture(F, 1);
537     Changed |= setOnlyReadsMemory(F, 1);
538     return Changed;
539   case LibFunc_aligned_alloc:
540     Changed |= setOnlyAccessesInaccessibleMemory(F);
541     Changed |= setRetAndArgsNoUndef(F);
542     Changed |= setDoesNotThrow(F);
543     Changed |= setRetDoesNotAlias(F);
544     Changed |= setWillReturn(F);
545     return Changed;
546   case LibFunc_bcopy:
547     Changed |= setDoesNotThrow(F);
548     Changed |= setOnlyAccessesArgMemory(F);
549     Changed |= setWillReturn(F);
550     Changed |= setDoesNotCapture(F, 0);
551     Changed |= setOnlyReadsMemory(F, 0);
552     Changed |= setOnlyWritesMemory(F, 1);
553     Changed |= setDoesNotCapture(F, 1);
554     return Changed;
555   case LibFunc_bcmp:
556     Changed |= setDoesNotThrow(F);
557     Changed |= setOnlyAccessesArgMemory(F);
558     Changed |= setOnlyReadsMemory(F);
559     Changed |= setWillReturn(F);
560     Changed |= setDoesNotCapture(F, 0);
561     Changed |= setDoesNotCapture(F, 1);
562     return Changed;
563   case LibFunc_bzero:
564     Changed |= setDoesNotThrow(F);
565     Changed |= setOnlyAccessesArgMemory(F);
566     Changed |= setWillReturn(F);
567     Changed |= setDoesNotCapture(F, 0);
568     Changed |= setOnlyWritesMemory(F, 0);
569     return Changed;
570   case LibFunc_calloc:
571   case LibFunc_vec_calloc:
572     Changed |= setRetAndArgsNoUndef(F);
573     Changed |= setDoesNotThrow(F);
574     Changed |= setRetDoesNotAlias(F);
575     Changed |= setWillReturn(F);
576     return Changed;
577   case LibFunc_chmod:
578   case LibFunc_chown:
579     Changed |= setRetAndArgsNoUndef(F);
580     Changed |= setDoesNotThrow(F);
581     Changed |= setDoesNotCapture(F, 0);
582     Changed |= setOnlyReadsMemory(F, 0);
583     return Changed;
584   case LibFunc_ctermid:
585   case LibFunc_clearerr:
586   case LibFunc_closedir:
587     Changed |= setRetAndArgsNoUndef(F);
588     Changed |= setDoesNotThrow(F);
589     Changed |= setDoesNotCapture(F, 0);
590     return Changed;
591   case LibFunc_atoi:
592   case LibFunc_atol:
593   case LibFunc_atof:
594   case LibFunc_atoll:
595     Changed |= setDoesNotThrow(F);
596     Changed |= setOnlyReadsMemory(F);
597     Changed |= setWillReturn(F);
598     Changed |= setDoesNotCapture(F, 0);
599     return Changed;
600   case LibFunc_access:
601     Changed |= setRetAndArgsNoUndef(F);
602     Changed |= setDoesNotThrow(F);
603     Changed |= setDoesNotCapture(F, 0);
604     Changed |= setOnlyReadsMemory(F, 0);
605     return Changed;
606   case LibFunc_fopen:
607     Changed |= setRetAndArgsNoUndef(F);
608     Changed |= setDoesNotThrow(F);
609     Changed |= setRetDoesNotAlias(F);
610     Changed |= setDoesNotCapture(F, 0);
611     Changed |= setDoesNotCapture(F, 1);
612     Changed |= setOnlyReadsMemory(F, 0);
613     Changed |= setOnlyReadsMemory(F, 1);
614     return Changed;
615   case LibFunc_fdopen:
616     Changed |= setRetAndArgsNoUndef(F);
617     Changed |= setDoesNotThrow(F);
618     Changed |= setRetDoesNotAlias(F);
619     Changed |= setDoesNotCapture(F, 1);
620     Changed |= setOnlyReadsMemory(F, 1);
621     return Changed;
622   case LibFunc_feof:
623     Changed |= setRetAndArgsNoUndef(F);
624     Changed |= setDoesNotThrow(F);
625     Changed |= setDoesNotCapture(F, 0);
626     return Changed;
627   case LibFunc_free:
628   case LibFunc_vec_free:
629     Changed |= setOnlyAccessesInaccessibleMemOrArgMem(F);
630     Changed |= setArgsNoUndef(F);
631     Changed |= setDoesNotThrow(F);
632     Changed |= setWillReturn(F);
633     Changed |= setDoesNotCapture(F, 0);
634     return Changed;
635   case LibFunc_fseek:
636   case LibFunc_ftell:
637   case LibFunc_fgetc:
638   case LibFunc_fgetc_unlocked:
639   case LibFunc_fseeko:
640   case LibFunc_ftello:
641   case LibFunc_fileno:
642   case LibFunc_fflush:
643   case LibFunc_fclose:
644   case LibFunc_fsetpos:
645   case LibFunc_flockfile:
646   case LibFunc_funlockfile:
647   case LibFunc_ftrylockfile:
648     Changed |= setRetAndArgsNoUndef(F);
649     Changed |= setDoesNotThrow(F);
650     Changed |= setDoesNotCapture(F, 0);
651     return Changed;
652   case LibFunc_ferror:
653     Changed |= setRetAndArgsNoUndef(F);
654     Changed |= setDoesNotThrow(F);
655     Changed |= setDoesNotCapture(F, 0);
656     Changed |= setOnlyReadsMemory(F);
657     return Changed;
658   case LibFunc_fputc:
659   case LibFunc_fputc_unlocked:
660   case LibFunc_fstat:
661     Changed |= setRetAndArgsNoUndef(F);
662     Changed |= setDoesNotThrow(F);
663     Changed |= setDoesNotCapture(F, 1);
664     return Changed;
665   case LibFunc_frexp:
666   case LibFunc_frexpf:
667   case LibFunc_frexpl:
668     Changed |= setDoesNotThrow(F);
669     Changed |= setWillReturn(F);
670     Changed |= setDoesNotCapture(F, 1);
671     return Changed;
672   case LibFunc_fstatvfs:
673     Changed |= setRetAndArgsNoUndef(F);
674     Changed |= setDoesNotThrow(F);
675     Changed |= setDoesNotCapture(F, 1);
676     return Changed;
677   case LibFunc_fgets:
678   case LibFunc_fgets_unlocked:
679     Changed |= setRetAndArgsNoUndef(F);
680     Changed |= setDoesNotThrow(F);
681     Changed |= setDoesNotCapture(F, 2);
682     return Changed;
683   case LibFunc_fread:
684   case LibFunc_fread_unlocked:
685     Changed |= setRetAndArgsNoUndef(F);
686     Changed |= setDoesNotThrow(F);
687     Changed |= setDoesNotCapture(F, 0);
688     Changed |= setDoesNotCapture(F, 3);
689     return Changed;
690   case LibFunc_fwrite:
691   case LibFunc_fwrite_unlocked:
692     Changed |= setRetAndArgsNoUndef(F);
693     Changed |= setDoesNotThrow(F);
694     Changed |= setDoesNotCapture(F, 0);
695     Changed |= setDoesNotCapture(F, 3);
696     // FIXME: readonly #1?
697     return Changed;
698   case LibFunc_fputs:
699   case LibFunc_fputs_unlocked:
700     Changed |= setRetAndArgsNoUndef(F);
701     Changed |= setDoesNotThrow(F);
702     Changed |= setDoesNotCapture(F, 0);
703     Changed |= setDoesNotCapture(F, 1);
704     Changed |= setOnlyReadsMemory(F, 0);
705     return Changed;
706   case LibFunc_fscanf:
707   case LibFunc_fprintf:
708     Changed |= setRetAndArgsNoUndef(F);
709     Changed |= setDoesNotThrow(F);
710     Changed |= setDoesNotCapture(F, 0);
711     Changed |= setDoesNotCapture(F, 1);
712     Changed |= setOnlyReadsMemory(F, 1);
713     return Changed;
714   case LibFunc_fgetpos:
715     Changed |= setRetAndArgsNoUndef(F);
716     Changed |= setDoesNotThrow(F);
717     Changed |= setDoesNotCapture(F, 0);
718     Changed |= setDoesNotCapture(F, 1);
719     return Changed;
720   case LibFunc_getc:
721     Changed |= setRetAndArgsNoUndef(F);
722     Changed |= setDoesNotThrow(F);
723     Changed |= setDoesNotCapture(F, 0);
724     return Changed;
725   case LibFunc_getlogin_r:
726     Changed |= setRetAndArgsNoUndef(F);
727     Changed |= setDoesNotThrow(F);
728     Changed |= setDoesNotCapture(F, 0);
729     return Changed;
730   case LibFunc_getc_unlocked:
731     Changed |= setRetAndArgsNoUndef(F);
732     Changed |= setDoesNotThrow(F);
733     Changed |= setDoesNotCapture(F, 0);
734     return Changed;
735   case LibFunc_getenv:
736     Changed |= setRetAndArgsNoUndef(F);
737     Changed |= setDoesNotThrow(F);
738     Changed |= setOnlyReadsMemory(F);
739     Changed |= setDoesNotCapture(F, 0);
740     return Changed;
741   case LibFunc_gets:
742   case LibFunc_getchar:
743   case LibFunc_getchar_unlocked:
744     Changed |= setRetAndArgsNoUndef(F);
745     Changed |= setDoesNotThrow(F);
746     return Changed;
747   case LibFunc_getitimer:
748     Changed |= setRetAndArgsNoUndef(F);
749     Changed |= setDoesNotThrow(F);
750     Changed |= setDoesNotCapture(F, 1);
751     return Changed;
752   case LibFunc_getpwnam:
753     Changed |= setRetAndArgsNoUndef(F);
754     Changed |= setDoesNotThrow(F);
755     Changed |= setDoesNotCapture(F, 0);
756     Changed |= setOnlyReadsMemory(F, 0);
757     return Changed;
758   case LibFunc_ungetc:
759     Changed |= setRetAndArgsNoUndef(F);
760     Changed |= setDoesNotThrow(F);
761     Changed |= setDoesNotCapture(F, 1);
762     return Changed;
763   case LibFunc_uname:
764     Changed |= setRetAndArgsNoUndef(F);
765     Changed |= setDoesNotThrow(F);
766     Changed |= setDoesNotCapture(F, 0);
767     return Changed;
768   case LibFunc_unlink:
769     Changed |= setRetAndArgsNoUndef(F);
770     Changed |= setDoesNotThrow(F);
771     Changed |= setDoesNotCapture(F, 0);
772     Changed |= setOnlyReadsMemory(F, 0);
773     return Changed;
774   case LibFunc_unsetenv:
775     Changed |= setRetAndArgsNoUndef(F);
776     Changed |= setDoesNotThrow(F);
777     Changed |= setDoesNotCapture(F, 0);
778     Changed |= setOnlyReadsMemory(F, 0);
779     return Changed;
780   case LibFunc_utime:
781   case LibFunc_utimes:
782     Changed |= setRetAndArgsNoUndef(F);
783     Changed |= setDoesNotThrow(F);
784     Changed |= setDoesNotCapture(F, 0);
785     Changed |= setDoesNotCapture(F, 1);
786     Changed |= setOnlyReadsMemory(F, 0);
787     Changed |= setOnlyReadsMemory(F, 1);
788     return Changed;
789   case LibFunc_putc:
790   case LibFunc_putc_unlocked:
791     Changed |= setRetAndArgsNoUndef(F);
792     Changed |= setDoesNotThrow(F);
793     Changed |= setDoesNotCapture(F, 1);
794     return Changed;
795   case LibFunc_puts:
796   case LibFunc_printf:
797   case LibFunc_perror:
798     Changed |= setRetAndArgsNoUndef(F);
799     Changed |= setDoesNotThrow(F);
800     Changed |= setDoesNotCapture(F, 0);
801     Changed |= setOnlyReadsMemory(F, 0);
802     return Changed;
803   case LibFunc_pread:
804     // May throw; "pread" is a valid pthread cancellation point.
805     Changed |= setRetAndArgsNoUndef(F);
806     Changed |= setDoesNotCapture(F, 1);
807     return Changed;
808   case LibFunc_pwrite:
809     // May throw; "pwrite" is a valid pthread cancellation point.
810     Changed |= setRetAndArgsNoUndef(F);
811     Changed |= setDoesNotCapture(F, 1);
812     Changed |= setOnlyReadsMemory(F, 1);
813     return Changed;
814   case LibFunc_putchar:
815   case LibFunc_putchar_unlocked:
816     Changed |= setRetAndArgsNoUndef(F);
817     Changed |= setDoesNotThrow(F);
818     return Changed;
819   case LibFunc_popen:
820     Changed |= setRetAndArgsNoUndef(F);
821     Changed |= setDoesNotThrow(F);
822     Changed |= setRetDoesNotAlias(F);
823     Changed |= setDoesNotCapture(F, 0);
824     Changed |= setDoesNotCapture(F, 1);
825     Changed |= setOnlyReadsMemory(F, 0);
826     Changed |= setOnlyReadsMemory(F, 1);
827     return Changed;
828   case LibFunc_pclose:
829     Changed |= setRetAndArgsNoUndef(F);
830     Changed |= setDoesNotThrow(F);
831     Changed |= setDoesNotCapture(F, 0);
832     return Changed;
833   case LibFunc_vscanf:
834     Changed |= setRetAndArgsNoUndef(F);
835     Changed |= setDoesNotThrow(F);
836     Changed |= setDoesNotCapture(F, 0);
837     Changed |= setOnlyReadsMemory(F, 0);
838     return Changed;
839   case LibFunc_vsscanf:
840     Changed |= setRetAndArgsNoUndef(F);
841     Changed |= setDoesNotThrow(F);
842     Changed |= setDoesNotCapture(F, 0);
843     Changed |= setDoesNotCapture(F, 1);
844     Changed |= setOnlyReadsMemory(F, 0);
845     Changed |= setOnlyReadsMemory(F, 1);
846     return Changed;
847   case LibFunc_vfscanf:
848     Changed |= setRetAndArgsNoUndef(F);
849     Changed |= setDoesNotThrow(F);
850     Changed |= setDoesNotCapture(F, 0);
851     Changed |= setDoesNotCapture(F, 1);
852     Changed |= setOnlyReadsMemory(F, 1);
853     return Changed;
854   case LibFunc_valloc:
855     Changed |= setOnlyAccessesInaccessibleMemory(F);
856     Changed |= setRetAndArgsNoUndef(F);
857     Changed |= setDoesNotThrow(F);
858     Changed |= setRetDoesNotAlias(F);
859     Changed |= setWillReturn(F);
860     return Changed;
861   case LibFunc_vprintf:
862     Changed |= setRetAndArgsNoUndef(F);
863     Changed |= setDoesNotThrow(F);
864     Changed |= setDoesNotCapture(F, 0);
865     Changed |= setOnlyReadsMemory(F, 0);
866     return Changed;
867   case LibFunc_vfprintf:
868   case LibFunc_vsprintf:
869     Changed |= setRetAndArgsNoUndef(F);
870     Changed |= setDoesNotThrow(F);
871     Changed |= setDoesNotCapture(F, 0);
872     Changed |= setDoesNotCapture(F, 1);
873     Changed |= setOnlyReadsMemory(F, 1);
874     return Changed;
875   case LibFunc_vsnprintf:
876     Changed |= setRetAndArgsNoUndef(F);
877     Changed |= setDoesNotThrow(F);
878     Changed |= setDoesNotCapture(F, 0);
879     Changed |= setDoesNotCapture(F, 2);
880     Changed |= setOnlyReadsMemory(F, 2);
881     return Changed;
882   case LibFunc_open:
883     // May throw; "open" is a valid pthread cancellation point.
884     Changed |= setRetAndArgsNoUndef(F);
885     Changed |= setDoesNotCapture(F, 0);
886     Changed |= setOnlyReadsMemory(F, 0);
887     return Changed;
888   case LibFunc_opendir:
889     Changed |= setRetAndArgsNoUndef(F);
890     Changed |= setDoesNotThrow(F);
891     Changed |= setRetDoesNotAlias(F);
892     Changed |= setDoesNotCapture(F, 0);
893     Changed |= setOnlyReadsMemory(F, 0);
894     return Changed;
895   case LibFunc_tmpfile:
896     Changed |= setRetAndArgsNoUndef(F);
897     Changed |= setDoesNotThrow(F);
898     Changed |= setRetDoesNotAlias(F);
899     return Changed;
900   case LibFunc_times:
901     Changed |= setRetAndArgsNoUndef(F);
902     Changed |= setDoesNotThrow(F);
903     Changed |= setDoesNotCapture(F, 0);
904     return Changed;
905   case LibFunc_htonl:
906   case LibFunc_htons:
907   case LibFunc_ntohl:
908   case LibFunc_ntohs:
909     Changed |= setDoesNotThrow(F);
910     Changed |= setDoesNotAccessMemory(F);
911     return Changed;
912   case LibFunc_lstat:
913     Changed |= setRetAndArgsNoUndef(F);
914     Changed |= setDoesNotThrow(F);
915     Changed |= setDoesNotCapture(F, 0);
916     Changed |= setDoesNotCapture(F, 1);
917     Changed |= setOnlyReadsMemory(F, 0);
918     return Changed;
919   case LibFunc_lchown:
920     Changed |= setRetAndArgsNoUndef(F);
921     Changed |= setDoesNotThrow(F);
922     Changed |= setDoesNotCapture(F, 0);
923     Changed |= setOnlyReadsMemory(F, 0);
924     return Changed;
925   case LibFunc_qsort:
926     // May throw; places call through function pointer.
927     // Cannot give undef pointer/size
928     Changed |= setRetAndArgsNoUndef(F);
929     Changed |= setDoesNotCapture(F, 3);
930     return Changed;
931   case LibFunc_dunder_strndup:
932     Changed |= setArgNoUndef(F, 1);
933     LLVM_FALLTHROUGH;
934   case LibFunc_dunder_strdup:
935     Changed |= setDoesNotThrow(F);
936     Changed |= setRetDoesNotAlias(F);
937     Changed |= setWillReturn(F);
938     Changed |= setDoesNotCapture(F, 0);
939     Changed |= setOnlyReadsMemory(F, 0);
940     return Changed;
941   case LibFunc_dunder_strtok_r:
942     Changed |= setDoesNotThrow(F);
943     Changed |= setDoesNotCapture(F, 1);
944     Changed |= setOnlyReadsMemory(F, 1);
945     return Changed;
946   case LibFunc_under_IO_getc:
947     Changed |= setRetAndArgsNoUndef(F);
948     Changed |= setDoesNotThrow(F);
949     Changed |= setDoesNotCapture(F, 0);
950     return Changed;
951   case LibFunc_under_IO_putc:
952     Changed |= setRetAndArgsNoUndef(F);
953     Changed |= setDoesNotThrow(F);
954     Changed |= setDoesNotCapture(F, 1);
955     return Changed;
956   case LibFunc_dunder_isoc99_scanf:
957     Changed |= setRetAndArgsNoUndef(F);
958     Changed |= setDoesNotThrow(F);
959     Changed |= setDoesNotCapture(F, 0);
960     Changed |= setOnlyReadsMemory(F, 0);
961     return Changed;
962   case LibFunc_stat64:
963   case LibFunc_lstat64:
964   case LibFunc_statvfs64:
965     Changed |= setRetAndArgsNoUndef(F);
966     Changed |= setDoesNotThrow(F);
967     Changed |= setDoesNotCapture(F, 0);
968     Changed |= setDoesNotCapture(F, 1);
969     Changed |= setOnlyReadsMemory(F, 0);
970     return Changed;
971   case LibFunc_dunder_isoc99_sscanf:
972     Changed |= setRetAndArgsNoUndef(F);
973     Changed |= setDoesNotThrow(F);
974     Changed |= setDoesNotCapture(F, 0);
975     Changed |= setDoesNotCapture(F, 1);
976     Changed |= setOnlyReadsMemory(F, 0);
977     Changed |= setOnlyReadsMemory(F, 1);
978     return Changed;
979   case LibFunc_fopen64:
980     Changed |= setRetAndArgsNoUndef(F);
981     Changed |= setDoesNotThrow(F);
982     Changed |= setRetDoesNotAlias(F);
983     Changed |= setDoesNotCapture(F, 0);
984     Changed |= setDoesNotCapture(F, 1);
985     Changed |= setOnlyReadsMemory(F, 0);
986     Changed |= setOnlyReadsMemory(F, 1);
987     return Changed;
988   case LibFunc_fseeko64:
989   case LibFunc_ftello64:
990     Changed |= setRetAndArgsNoUndef(F);
991     Changed |= setDoesNotThrow(F);
992     Changed |= setDoesNotCapture(F, 0);
993     return Changed;
994   case LibFunc_tmpfile64:
995     Changed |= setRetAndArgsNoUndef(F);
996     Changed |= setDoesNotThrow(F);
997     Changed |= setRetDoesNotAlias(F);
998     return Changed;
999   case LibFunc_fstat64:
1000   case LibFunc_fstatvfs64:
1001     Changed |= setRetAndArgsNoUndef(F);
1002     Changed |= setDoesNotThrow(F);
1003     Changed |= setDoesNotCapture(F, 1);
1004     return Changed;
1005   case LibFunc_open64:
1006     // May throw; "open" is a valid pthread cancellation point.
1007     Changed |= setRetAndArgsNoUndef(F);
1008     Changed |= setDoesNotCapture(F, 0);
1009     Changed |= setOnlyReadsMemory(F, 0);
1010     return Changed;
1011   case LibFunc_gettimeofday:
1012     // Currently some platforms have the restrict keyword on the arguments to
1013     // gettimeofday. To be conservative, do not add noalias to gettimeofday's
1014     // arguments.
1015     Changed |= setRetAndArgsNoUndef(F);
1016     Changed |= setDoesNotThrow(F);
1017     Changed |= setDoesNotCapture(F, 0);
1018     Changed |= setDoesNotCapture(F, 1);
1019     return Changed;
1020   // TODO: add LibFunc entries for:
1021   // case LibFunc_memset_pattern4:
1022   // case LibFunc_memset_pattern8:
1023   case LibFunc_memset_pattern16:
1024     Changed |= setOnlyAccessesArgMemory(F);
1025     Changed |= setDoesNotCapture(F, 0);
1026     Changed |= setOnlyWritesMemory(F, 0);
1027     Changed |= setDoesNotCapture(F, 1);
1028     Changed |= setOnlyReadsMemory(F, 1);
1029     return Changed;
1030   case LibFunc_memset:
1031     Changed |= setWillReturn(F);
1032     LLVM_FALLTHROUGH;
1033   case LibFunc_memset_chk:
1034     Changed |= setOnlyAccessesArgMemory(F);
1035     Changed |= setOnlyWritesMemory(F, 0);
1036     Changed |= setDoesNotThrow(F);
1037     return Changed;
1038   // int __nvvm_reflect(const char *)
1039   case LibFunc_nvvm_reflect:
1040     Changed |= setRetAndArgsNoUndef(F);
1041     Changed |= setDoesNotAccessMemory(F);
1042     Changed |= setDoesNotThrow(F);
1043     return Changed;
1044   case LibFunc_ldexp:
1045   case LibFunc_ldexpf:
1046   case LibFunc_ldexpl:
1047     Changed |= setSignExtendedArg(F, 1);
1048     Changed |= setWillReturn(F);
1049     return Changed;
1050   case LibFunc_abs:
1051   case LibFunc_acos:
1052   case LibFunc_acosf:
1053   case LibFunc_acosh:
1054   case LibFunc_acoshf:
1055   case LibFunc_acoshl:
1056   case LibFunc_acosl:
1057   case LibFunc_asin:
1058   case LibFunc_asinf:
1059   case LibFunc_asinh:
1060   case LibFunc_asinhf:
1061   case LibFunc_asinhl:
1062   case LibFunc_asinl:
1063   case LibFunc_atan:
1064   case LibFunc_atan2:
1065   case LibFunc_atan2f:
1066   case LibFunc_atan2l:
1067   case LibFunc_atanf:
1068   case LibFunc_atanh:
1069   case LibFunc_atanhf:
1070   case LibFunc_atanhl:
1071   case LibFunc_atanl:
1072   case LibFunc_cbrt:
1073   case LibFunc_cbrtf:
1074   case LibFunc_cbrtl:
1075   case LibFunc_ceil:
1076   case LibFunc_ceilf:
1077   case LibFunc_ceill:
1078   case LibFunc_copysign:
1079   case LibFunc_copysignf:
1080   case LibFunc_copysignl:
1081   case LibFunc_cos:
1082   case LibFunc_cosh:
1083   case LibFunc_coshf:
1084   case LibFunc_coshl:
1085   case LibFunc_cosf:
1086   case LibFunc_cosl:
1087   case LibFunc_cospi:
1088   case LibFunc_cospif:
1089   case LibFunc_exp:
1090   case LibFunc_expf:
1091   case LibFunc_expl:
1092   case LibFunc_exp2:
1093   case LibFunc_exp2f:
1094   case LibFunc_exp2l:
1095   case LibFunc_expm1:
1096   case LibFunc_expm1f:
1097   case LibFunc_expm1l:
1098   case LibFunc_fabs:
1099   case LibFunc_fabsf:
1100   case LibFunc_fabsl:
1101   case LibFunc_ffs:
1102   case LibFunc_ffsl:
1103   case LibFunc_ffsll:
1104   case LibFunc_floor:
1105   case LibFunc_floorf:
1106   case LibFunc_floorl:
1107   case LibFunc_fls:
1108   case LibFunc_flsl:
1109   case LibFunc_flsll:
1110   case LibFunc_fmax:
1111   case LibFunc_fmaxf:
1112   case LibFunc_fmaxl:
1113   case LibFunc_fmin:
1114   case LibFunc_fminf:
1115   case LibFunc_fminl:
1116   case LibFunc_fmod:
1117   case LibFunc_fmodf:
1118   case LibFunc_fmodl:
1119   case LibFunc_isascii:
1120   case LibFunc_isdigit:
1121   case LibFunc_labs:
1122   case LibFunc_llabs:
1123   case LibFunc_log:
1124   case LibFunc_log10:
1125   case LibFunc_log10f:
1126   case LibFunc_log10l:
1127   case LibFunc_log1p:
1128   case LibFunc_log1pf:
1129   case LibFunc_log1pl:
1130   case LibFunc_log2:
1131   case LibFunc_log2f:
1132   case LibFunc_log2l:
1133   case LibFunc_logb:
1134   case LibFunc_logbf:
1135   case LibFunc_logbl:
1136   case LibFunc_logf:
1137   case LibFunc_logl:
1138   case LibFunc_nearbyint:
1139   case LibFunc_nearbyintf:
1140   case LibFunc_nearbyintl:
1141   case LibFunc_pow:
1142   case LibFunc_powf:
1143   case LibFunc_powl:
1144   case LibFunc_rint:
1145   case LibFunc_rintf:
1146   case LibFunc_rintl:
1147   case LibFunc_round:
1148   case LibFunc_roundf:
1149   case LibFunc_roundl:
1150   case LibFunc_sin:
1151   case LibFunc_sincospif_stret:
1152   case LibFunc_sinf:
1153   case LibFunc_sinh:
1154   case LibFunc_sinhf:
1155   case LibFunc_sinhl:
1156   case LibFunc_sinl:
1157   case LibFunc_sinpi:
1158   case LibFunc_sinpif:
1159   case LibFunc_sqrt:
1160   case LibFunc_sqrtf:
1161   case LibFunc_sqrtl:
1162   case LibFunc_strnlen:
1163   case LibFunc_tan:
1164   case LibFunc_tanf:
1165   case LibFunc_tanh:
1166   case LibFunc_tanhf:
1167   case LibFunc_tanhl:
1168   case LibFunc_tanl:
1169   case LibFunc_toascii:
1170   case LibFunc_trunc:
1171   case LibFunc_truncf:
1172   case LibFunc_truncl:
1173     Changed |= setDoesNotThrow(F);
1174     Changed |= setDoesNotFreeMemory(F);
1175     Changed |= setWillReturn(F);
1176     return Changed;
1177   default:
1178     // FIXME: It'd be really nice to cover all the library functions we're
1179     // aware of here.
1180     return false;
1181   }
1182 }
1183 
1184 bool llvm::hasFloatFn(const TargetLibraryInfo *TLI, Type *Ty,
1185                       LibFunc DoubleFn, LibFunc FloatFn, LibFunc LongDoubleFn) {
1186   switch (Ty->getTypeID()) {
1187   case Type::HalfTyID:
1188     return false;
1189   case Type::FloatTyID:
1190     return TLI->has(FloatFn);
1191   case Type::DoubleTyID:
1192     return TLI->has(DoubleFn);
1193   default:
1194     return TLI->has(LongDoubleFn);
1195   }
1196 }
1197 
1198 StringRef llvm::getFloatFnName(const TargetLibraryInfo *TLI, Type *Ty,
1199                                LibFunc DoubleFn, LibFunc FloatFn,
1200                                LibFunc LongDoubleFn) {
1201   assert(hasFloatFn(TLI, Ty, DoubleFn, FloatFn, LongDoubleFn) &&
1202          "Cannot get name for unavailable function!");
1203 
1204   switch (Ty->getTypeID()) {
1205   case Type::HalfTyID:
1206     llvm_unreachable("No name for HalfTy!");
1207   case Type::FloatTyID:
1208     return TLI->getName(FloatFn);
1209   case Type::DoubleTyID:
1210     return TLI->getName(DoubleFn);
1211   default:
1212     return TLI->getName(LongDoubleFn);
1213   }
1214 }
1215 
1216 //- Emit LibCalls ------------------------------------------------------------//
1217 
1218 Value *llvm::castToCStr(Value *V, IRBuilderBase &B) {
1219   unsigned AS = V->getType()->getPointerAddressSpace();
1220   return B.CreateBitCast(V, B.getInt8PtrTy(AS), "cstr");
1221 }
1222 
1223 static Value *emitLibCall(LibFunc TheLibFunc, Type *ReturnType,
1224                           ArrayRef<Type *> ParamTypes,
1225                           ArrayRef<Value *> Operands, IRBuilderBase &B,
1226                           const TargetLibraryInfo *TLI,
1227                           bool IsVaArgs = false) {
1228   if (!TLI->has(TheLibFunc))
1229     return nullptr;
1230 
1231   Module *M = B.GetInsertBlock()->getModule();
1232   StringRef FuncName = TLI->getName(TheLibFunc);
1233   FunctionType *FuncType = FunctionType::get(ReturnType, ParamTypes, IsVaArgs);
1234   FunctionCallee Callee = M->getOrInsertFunction(FuncName, FuncType);
1235   inferLibFuncAttributes(M, FuncName, *TLI);
1236   CallInst *CI = B.CreateCall(Callee, Operands, FuncName);
1237   if (const Function *F =
1238           dyn_cast<Function>(Callee.getCallee()->stripPointerCasts()))
1239     CI->setCallingConv(F->getCallingConv());
1240   return CI;
1241 }
1242 
1243 Value *llvm::emitStrLen(Value *Ptr, IRBuilderBase &B, const DataLayout &DL,
1244                         const TargetLibraryInfo *TLI) {
1245   LLVMContext &Context = B.GetInsertBlock()->getContext();
1246   return emitLibCall(LibFunc_strlen, DL.getIntPtrType(Context),
1247                      B.getInt8PtrTy(), castToCStr(Ptr, B), B, TLI);
1248 }
1249 
1250 Value *llvm::emitStrDup(Value *Ptr, IRBuilderBase &B,
1251                         const TargetLibraryInfo *TLI) {
1252   return emitLibCall(LibFunc_strdup, B.getInt8PtrTy(), B.getInt8PtrTy(),
1253                      castToCStr(Ptr, B), B, TLI);
1254 }
1255 
1256 Value *llvm::emitStrChr(Value *Ptr, char C, IRBuilderBase &B,
1257                         const TargetLibraryInfo *TLI) {
1258   Type *I8Ptr = B.getInt8PtrTy();
1259   Type *I32Ty = B.getInt32Ty();
1260   return emitLibCall(LibFunc_strchr, I8Ptr, {I8Ptr, I32Ty},
1261                      {castToCStr(Ptr, B), ConstantInt::get(I32Ty, C)}, B, TLI);
1262 }
1263 
1264 Value *llvm::emitStrNCmp(Value *Ptr1, Value *Ptr2, Value *Len, IRBuilderBase &B,
1265                          const DataLayout &DL, const TargetLibraryInfo *TLI) {
1266   LLVMContext &Context = B.GetInsertBlock()->getContext();
1267   return emitLibCall(
1268       LibFunc_strncmp, B.getInt32Ty(),
1269       {B.getInt8PtrTy(), B.getInt8PtrTy(), DL.getIntPtrType(Context)},
1270       {castToCStr(Ptr1, B), castToCStr(Ptr2, B), Len}, B, TLI);
1271 }
1272 
1273 Value *llvm::emitStrCpy(Value *Dst, Value *Src, IRBuilderBase &B,
1274                         const TargetLibraryInfo *TLI) {
1275   Type *I8Ptr = Dst->getType();
1276   return emitLibCall(LibFunc_strcpy, I8Ptr, {I8Ptr, I8Ptr},
1277                      {castToCStr(Dst, B), castToCStr(Src, B)}, B, TLI);
1278 }
1279 
1280 Value *llvm::emitStpCpy(Value *Dst, Value *Src, IRBuilderBase &B,
1281                         const TargetLibraryInfo *TLI) {
1282   Type *I8Ptr = B.getInt8PtrTy();
1283   return emitLibCall(LibFunc_stpcpy, I8Ptr, {I8Ptr, I8Ptr},
1284                      {castToCStr(Dst, B), castToCStr(Src, B)}, B, TLI);
1285 }
1286 
1287 Value *llvm::emitStrNCpy(Value *Dst, Value *Src, Value *Len, IRBuilderBase &B,
1288                          const TargetLibraryInfo *TLI) {
1289   Type *I8Ptr = B.getInt8PtrTy();
1290   return emitLibCall(LibFunc_strncpy, I8Ptr, {I8Ptr, I8Ptr, Len->getType()},
1291                      {castToCStr(Dst, B), castToCStr(Src, B), Len}, B, TLI);
1292 }
1293 
1294 Value *llvm::emitStpNCpy(Value *Dst, Value *Src, Value *Len, IRBuilderBase &B,
1295                          const TargetLibraryInfo *TLI) {
1296   Type *I8Ptr = B.getInt8PtrTy();
1297   return emitLibCall(LibFunc_stpncpy, I8Ptr, {I8Ptr, I8Ptr, Len->getType()},
1298                      {castToCStr(Dst, B), castToCStr(Src, B), Len}, B, TLI);
1299 }
1300 
1301 Value *llvm::emitMemCpyChk(Value *Dst, Value *Src, Value *Len, Value *ObjSize,
1302                            IRBuilderBase &B, const DataLayout &DL,
1303                            const TargetLibraryInfo *TLI) {
1304   if (!TLI->has(LibFunc_memcpy_chk))
1305     return nullptr;
1306 
1307   Module *M = B.GetInsertBlock()->getModule();
1308   AttributeList AS;
1309   AS = AttributeList::get(M->getContext(), AttributeList::FunctionIndex,
1310                           Attribute::NoUnwind);
1311   LLVMContext &Context = B.GetInsertBlock()->getContext();
1312   FunctionCallee MemCpy = M->getOrInsertFunction(
1313       "__memcpy_chk", AttributeList::get(M->getContext(), AS), B.getInt8PtrTy(),
1314       B.getInt8PtrTy(), B.getInt8PtrTy(), DL.getIntPtrType(Context),
1315       DL.getIntPtrType(Context));
1316   Dst = castToCStr(Dst, B);
1317   Src = castToCStr(Src, B);
1318   CallInst *CI = B.CreateCall(MemCpy, {Dst, Src, Len, ObjSize});
1319   if (const Function *F =
1320           dyn_cast<Function>(MemCpy.getCallee()->stripPointerCasts()))
1321     CI->setCallingConv(F->getCallingConv());
1322   return CI;
1323 }
1324 
1325 Value *llvm::emitMemPCpy(Value *Dst, Value *Src, Value *Len, IRBuilderBase &B,
1326                          const DataLayout &DL, const TargetLibraryInfo *TLI) {
1327   LLVMContext &Context = B.GetInsertBlock()->getContext();
1328   return emitLibCall(
1329       LibFunc_mempcpy, B.getInt8PtrTy(),
1330       {B.getInt8PtrTy(), B.getInt8PtrTy(), DL.getIntPtrType(Context)},
1331       {Dst, Src, Len}, B, TLI);
1332 }
1333 
1334 Value *llvm::emitMemChr(Value *Ptr, Value *Val, Value *Len, IRBuilderBase &B,
1335                         const DataLayout &DL, const TargetLibraryInfo *TLI) {
1336   LLVMContext &Context = B.GetInsertBlock()->getContext();
1337   return emitLibCall(
1338       LibFunc_memchr, B.getInt8PtrTy(),
1339       {B.getInt8PtrTy(), B.getInt32Ty(), DL.getIntPtrType(Context)},
1340       {castToCStr(Ptr, B), Val, Len}, B, TLI);
1341 }
1342 
1343 Value *llvm::emitMemCmp(Value *Ptr1, Value *Ptr2, Value *Len, IRBuilderBase &B,
1344                         const DataLayout &DL, const TargetLibraryInfo *TLI) {
1345   LLVMContext &Context = B.GetInsertBlock()->getContext();
1346   return emitLibCall(
1347       LibFunc_memcmp, B.getInt32Ty(),
1348       {B.getInt8PtrTy(), B.getInt8PtrTy(), DL.getIntPtrType(Context)},
1349       {castToCStr(Ptr1, B), castToCStr(Ptr2, B), Len}, B, TLI);
1350 }
1351 
1352 Value *llvm::emitBCmp(Value *Ptr1, Value *Ptr2, Value *Len, IRBuilderBase &B,
1353                       const DataLayout &DL, const TargetLibraryInfo *TLI) {
1354   LLVMContext &Context = B.GetInsertBlock()->getContext();
1355   return emitLibCall(
1356       LibFunc_bcmp, B.getInt32Ty(),
1357       {B.getInt8PtrTy(), B.getInt8PtrTy(), DL.getIntPtrType(Context)},
1358       {castToCStr(Ptr1, B), castToCStr(Ptr2, B), Len}, B, TLI);
1359 }
1360 
1361 Value *llvm::emitMemCCpy(Value *Ptr1, Value *Ptr2, Value *Val, Value *Len,
1362                          IRBuilderBase &B, const TargetLibraryInfo *TLI) {
1363   return emitLibCall(
1364       LibFunc_memccpy, B.getInt8PtrTy(),
1365       {B.getInt8PtrTy(), B.getInt8PtrTy(), B.getInt32Ty(), Len->getType()},
1366       {Ptr1, Ptr2, Val, Len}, B, TLI);
1367 }
1368 
1369 Value *llvm::emitSNPrintf(Value *Dest, Value *Size, Value *Fmt,
1370                           ArrayRef<Value *> VariadicArgs, IRBuilderBase &B,
1371                           const TargetLibraryInfo *TLI) {
1372   SmallVector<Value *, 8> Args{castToCStr(Dest, B), Size, castToCStr(Fmt, B)};
1373   llvm::append_range(Args, VariadicArgs);
1374   return emitLibCall(LibFunc_snprintf, B.getInt32Ty(),
1375                      {B.getInt8PtrTy(), Size->getType(), B.getInt8PtrTy()},
1376                      Args, B, TLI, /*IsVaArgs=*/true);
1377 }
1378 
1379 Value *llvm::emitSPrintf(Value *Dest, Value *Fmt,
1380                          ArrayRef<Value *> VariadicArgs, IRBuilderBase &B,
1381                          const TargetLibraryInfo *TLI) {
1382   SmallVector<Value *, 8> Args{castToCStr(Dest, B), castToCStr(Fmt, B)};
1383   llvm::append_range(Args, VariadicArgs);
1384   return emitLibCall(LibFunc_sprintf, B.getInt32Ty(),
1385                      {B.getInt8PtrTy(), B.getInt8PtrTy()}, Args, B, TLI,
1386                      /*IsVaArgs=*/true);
1387 }
1388 
1389 Value *llvm::emitStrCat(Value *Dest, Value *Src, IRBuilderBase &B,
1390                         const TargetLibraryInfo *TLI) {
1391   return emitLibCall(LibFunc_strcat, B.getInt8PtrTy(),
1392                      {B.getInt8PtrTy(), B.getInt8PtrTy()},
1393                      {castToCStr(Dest, B), castToCStr(Src, B)}, B, TLI);
1394 }
1395 
1396 Value *llvm::emitStrLCpy(Value *Dest, Value *Src, Value *Size, IRBuilderBase &B,
1397                          const TargetLibraryInfo *TLI) {
1398   return emitLibCall(LibFunc_strlcpy, Size->getType(),
1399                      {B.getInt8PtrTy(), B.getInt8PtrTy(), Size->getType()},
1400                      {castToCStr(Dest, B), castToCStr(Src, B), Size}, B, TLI);
1401 }
1402 
1403 Value *llvm::emitStrLCat(Value *Dest, Value *Src, Value *Size, IRBuilderBase &B,
1404                          const TargetLibraryInfo *TLI) {
1405   return emitLibCall(LibFunc_strlcat, Size->getType(),
1406                      {B.getInt8PtrTy(), B.getInt8PtrTy(), Size->getType()},
1407                      {castToCStr(Dest, B), castToCStr(Src, B), Size}, B, TLI);
1408 }
1409 
1410 Value *llvm::emitStrNCat(Value *Dest, Value *Src, Value *Size, IRBuilderBase &B,
1411                          const TargetLibraryInfo *TLI) {
1412   return emitLibCall(LibFunc_strncat, B.getInt8PtrTy(),
1413                      {B.getInt8PtrTy(), B.getInt8PtrTy(), Size->getType()},
1414                      {castToCStr(Dest, B), castToCStr(Src, B), Size}, B, TLI);
1415 }
1416 
1417 Value *llvm::emitVSNPrintf(Value *Dest, Value *Size, Value *Fmt, Value *VAList,
1418                            IRBuilderBase &B, const TargetLibraryInfo *TLI) {
1419   return emitLibCall(
1420       LibFunc_vsnprintf, B.getInt32Ty(),
1421       {B.getInt8PtrTy(), Size->getType(), B.getInt8PtrTy(), VAList->getType()},
1422       {castToCStr(Dest, B), Size, castToCStr(Fmt, B), VAList}, B, TLI);
1423 }
1424 
1425 Value *llvm::emitVSPrintf(Value *Dest, Value *Fmt, Value *VAList,
1426                           IRBuilderBase &B, const TargetLibraryInfo *TLI) {
1427   return emitLibCall(LibFunc_vsprintf, B.getInt32Ty(),
1428                      {B.getInt8PtrTy(), B.getInt8PtrTy(), VAList->getType()},
1429                      {castToCStr(Dest, B), castToCStr(Fmt, B), VAList}, B, TLI);
1430 }
1431 
1432 /// Append a suffix to the function name according to the type of 'Op'.
1433 static void appendTypeSuffix(Value *Op, StringRef &Name,
1434                              SmallString<20> &NameBuffer) {
1435   if (!Op->getType()->isDoubleTy()) {
1436       NameBuffer += Name;
1437 
1438     if (Op->getType()->isFloatTy())
1439       NameBuffer += 'f';
1440     else
1441       NameBuffer += 'l';
1442 
1443     Name = NameBuffer;
1444   }
1445 }
1446 
1447 static Value *emitUnaryFloatFnCallHelper(Value *Op, StringRef Name,
1448                                          IRBuilderBase &B,
1449                                          const AttributeList &Attrs) {
1450   assert((Name != "") && "Must specify Name to emitUnaryFloatFnCall");
1451 
1452   Module *M = B.GetInsertBlock()->getModule();
1453   FunctionCallee Callee =
1454       M->getOrInsertFunction(Name, Op->getType(), Op->getType());
1455   CallInst *CI = B.CreateCall(Callee, Op, Name);
1456 
1457   // The incoming attribute set may have come from a speculatable intrinsic, but
1458   // is being replaced with a library call which is not allowed to be
1459   // speculatable.
1460   CI->setAttributes(
1461       Attrs.removeFnAttribute(B.getContext(), Attribute::Speculatable));
1462   if (const Function *F =
1463           dyn_cast<Function>(Callee.getCallee()->stripPointerCasts()))
1464     CI->setCallingConv(F->getCallingConv());
1465 
1466   return CI;
1467 }
1468 
1469 Value *llvm::emitUnaryFloatFnCall(Value *Op, StringRef Name, IRBuilderBase &B,
1470                                   const AttributeList &Attrs) {
1471   SmallString<20> NameBuffer;
1472   appendTypeSuffix(Op, Name, NameBuffer);
1473 
1474   return emitUnaryFloatFnCallHelper(Op, Name, B, Attrs);
1475 }
1476 
1477 Value *llvm::emitUnaryFloatFnCall(Value *Op, const TargetLibraryInfo *TLI,
1478                                   LibFunc DoubleFn, LibFunc FloatFn,
1479                                   LibFunc LongDoubleFn, IRBuilderBase &B,
1480                                   const AttributeList &Attrs) {
1481   // Get the name of the function according to TLI.
1482   StringRef Name = getFloatFnName(TLI, Op->getType(),
1483                                   DoubleFn, FloatFn, LongDoubleFn);
1484 
1485   return emitUnaryFloatFnCallHelper(Op, Name, B, Attrs);
1486 }
1487 
1488 static Value *emitBinaryFloatFnCallHelper(Value *Op1, Value *Op2,
1489                                           StringRef Name, IRBuilderBase &B,
1490                                           const AttributeList &Attrs,
1491                                           const TargetLibraryInfo *TLI = nullptr) {
1492   assert((Name != "") && "Must specify Name to emitBinaryFloatFnCall");
1493 
1494   Module *M = B.GetInsertBlock()->getModule();
1495   FunctionCallee Callee = M->getOrInsertFunction(Name, Op1->getType(),
1496                                                  Op1->getType(), Op2->getType());
1497   if (TLI != nullptr)
1498     inferLibFuncAttributes(M, Name, *TLI);
1499   CallInst *CI = B.CreateCall(Callee, { Op1, Op2 }, Name);
1500 
1501   // The incoming attribute set may have come from a speculatable intrinsic, but
1502   // is being replaced with a library call which is not allowed to be
1503   // speculatable.
1504   CI->setAttributes(
1505       Attrs.removeFnAttribute(B.getContext(), Attribute::Speculatable));
1506   if (const Function *F =
1507           dyn_cast<Function>(Callee.getCallee()->stripPointerCasts()))
1508     CI->setCallingConv(F->getCallingConv());
1509 
1510   return CI;
1511 }
1512 
1513 Value *llvm::emitBinaryFloatFnCall(Value *Op1, Value *Op2, StringRef Name,
1514                                    IRBuilderBase &B,
1515                                    const AttributeList &Attrs) {
1516   assert((Name != "") && "Must specify Name to emitBinaryFloatFnCall");
1517 
1518   SmallString<20> NameBuffer;
1519   appendTypeSuffix(Op1, Name, NameBuffer);
1520 
1521   return emitBinaryFloatFnCallHelper(Op1, Op2, Name, B, Attrs);
1522 }
1523 
1524 Value *llvm::emitBinaryFloatFnCall(Value *Op1, Value *Op2,
1525                                    const TargetLibraryInfo *TLI,
1526                                    LibFunc DoubleFn, LibFunc FloatFn,
1527                                    LibFunc LongDoubleFn, IRBuilderBase &B,
1528                                    const AttributeList &Attrs) {
1529   // Get the name of the function according to TLI.
1530   StringRef Name = getFloatFnName(TLI, Op1->getType(),
1531                                   DoubleFn, FloatFn, LongDoubleFn);
1532 
1533   return emitBinaryFloatFnCallHelper(Op1, Op2, Name, B, Attrs, TLI);
1534 }
1535 
1536 Value *llvm::emitPutChar(Value *Char, IRBuilderBase &B,
1537                          const TargetLibraryInfo *TLI) {
1538   if (!TLI->has(LibFunc_putchar))
1539     return nullptr;
1540 
1541   Module *M = B.GetInsertBlock()->getModule();
1542   StringRef PutCharName = TLI->getName(LibFunc_putchar);
1543   FunctionCallee PutChar =
1544       M->getOrInsertFunction(PutCharName, B.getInt32Ty(), B.getInt32Ty());
1545   inferLibFuncAttributes(M, PutCharName, *TLI);
1546   CallInst *CI = B.CreateCall(PutChar,
1547                               B.CreateIntCast(Char,
1548                               B.getInt32Ty(),
1549                               /*isSigned*/true,
1550                               "chari"),
1551                               PutCharName);
1552 
1553   if (const Function *F =
1554           dyn_cast<Function>(PutChar.getCallee()->stripPointerCasts()))
1555     CI->setCallingConv(F->getCallingConv());
1556   return CI;
1557 }
1558 
1559 Value *llvm::emitPutS(Value *Str, IRBuilderBase &B,
1560                       const TargetLibraryInfo *TLI) {
1561   if (!TLI->has(LibFunc_puts))
1562     return nullptr;
1563 
1564   Module *M = B.GetInsertBlock()->getModule();
1565   StringRef PutsName = TLI->getName(LibFunc_puts);
1566   FunctionCallee PutS =
1567       M->getOrInsertFunction(PutsName, B.getInt32Ty(), B.getInt8PtrTy());
1568   inferLibFuncAttributes(M, PutsName, *TLI);
1569   CallInst *CI = B.CreateCall(PutS, castToCStr(Str, B), PutsName);
1570   if (const Function *F =
1571           dyn_cast<Function>(PutS.getCallee()->stripPointerCasts()))
1572     CI->setCallingConv(F->getCallingConv());
1573   return CI;
1574 }
1575 
1576 Value *llvm::emitFPutC(Value *Char, Value *File, IRBuilderBase &B,
1577                        const TargetLibraryInfo *TLI) {
1578   if (!TLI->has(LibFunc_fputc))
1579     return nullptr;
1580 
1581   Module *M = B.GetInsertBlock()->getModule();
1582   StringRef FPutcName = TLI->getName(LibFunc_fputc);
1583   FunctionCallee F = M->getOrInsertFunction(FPutcName, B.getInt32Ty(),
1584                                             B.getInt32Ty(), File->getType());
1585   if (File->getType()->isPointerTy())
1586     inferLibFuncAttributes(M, FPutcName, *TLI);
1587   Char = B.CreateIntCast(Char, B.getInt32Ty(), /*isSigned*/true,
1588                          "chari");
1589   CallInst *CI = B.CreateCall(F, {Char, File}, FPutcName);
1590 
1591   if (const Function *Fn =
1592           dyn_cast<Function>(F.getCallee()->stripPointerCasts()))
1593     CI->setCallingConv(Fn->getCallingConv());
1594   return CI;
1595 }
1596 
1597 Value *llvm::emitFPutS(Value *Str, Value *File, IRBuilderBase &B,
1598                        const TargetLibraryInfo *TLI) {
1599   if (!TLI->has(LibFunc_fputs))
1600     return nullptr;
1601 
1602   Module *M = B.GetInsertBlock()->getModule();
1603   StringRef FPutsName = TLI->getName(LibFunc_fputs);
1604   FunctionCallee F = M->getOrInsertFunction(FPutsName, B.getInt32Ty(),
1605                                             B.getInt8PtrTy(), File->getType());
1606   if (File->getType()->isPointerTy())
1607     inferLibFuncAttributes(M, FPutsName, *TLI);
1608   CallInst *CI = B.CreateCall(F, {castToCStr(Str, B), File}, FPutsName);
1609 
1610   if (const Function *Fn =
1611           dyn_cast<Function>(F.getCallee()->stripPointerCasts()))
1612     CI->setCallingConv(Fn->getCallingConv());
1613   return CI;
1614 }
1615 
1616 Value *llvm::emitFWrite(Value *Ptr, Value *Size, Value *File, IRBuilderBase &B,
1617                         const DataLayout &DL, const TargetLibraryInfo *TLI) {
1618   if (!TLI->has(LibFunc_fwrite))
1619     return nullptr;
1620 
1621   Module *M = B.GetInsertBlock()->getModule();
1622   LLVMContext &Context = B.GetInsertBlock()->getContext();
1623   StringRef FWriteName = TLI->getName(LibFunc_fwrite);
1624   FunctionCallee F = M->getOrInsertFunction(
1625       FWriteName, DL.getIntPtrType(Context), B.getInt8PtrTy(),
1626       DL.getIntPtrType(Context), DL.getIntPtrType(Context), File->getType());
1627 
1628   if (File->getType()->isPointerTy())
1629     inferLibFuncAttributes(M, FWriteName, *TLI);
1630   CallInst *CI =
1631       B.CreateCall(F, {castToCStr(Ptr, B), Size,
1632                        ConstantInt::get(DL.getIntPtrType(Context), 1), File});
1633 
1634   if (const Function *Fn =
1635           dyn_cast<Function>(F.getCallee()->stripPointerCasts()))
1636     CI->setCallingConv(Fn->getCallingConv());
1637   return CI;
1638 }
1639 
1640 Value *llvm::emitMalloc(Value *Num, IRBuilderBase &B, const DataLayout &DL,
1641                         const TargetLibraryInfo *TLI) {
1642   if (!TLI->has(LibFunc_malloc))
1643     return nullptr;
1644 
1645   Module *M = B.GetInsertBlock()->getModule();
1646   StringRef MallocName = TLI->getName(LibFunc_malloc);
1647   LLVMContext &Context = B.GetInsertBlock()->getContext();
1648   FunctionCallee Malloc = M->getOrInsertFunction(MallocName, B.getInt8PtrTy(),
1649                                                  DL.getIntPtrType(Context));
1650   inferLibFuncAttributes(M, MallocName, *TLI);
1651   CallInst *CI = B.CreateCall(Malloc, Num, MallocName);
1652 
1653   if (const Function *F =
1654           dyn_cast<Function>(Malloc.getCallee()->stripPointerCasts()))
1655     CI->setCallingConv(F->getCallingConv());
1656 
1657   return CI;
1658 }
1659 
1660 Value *llvm::emitCalloc(Value *Num, Value *Size, IRBuilderBase &B,
1661                         const TargetLibraryInfo &TLI) {
1662   if (!TLI.has(LibFunc_calloc))
1663     return nullptr;
1664 
1665   Module *M = B.GetInsertBlock()->getModule();
1666   StringRef CallocName = TLI.getName(LibFunc_calloc);
1667   const DataLayout &DL = M->getDataLayout();
1668   IntegerType *PtrType = DL.getIntPtrType((B.GetInsertBlock()->getContext()));
1669   FunctionCallee Calloc =
1670       M->getOrInsertFunction(CallocName, B.getInt8PtrTy(), PtrType, PtrType);
1671   inferLibFuncAttributes(M, CallocName, TLI);
1672   CallInst *CI = B.CreateCall(Calloc, {Num, Size}, CallocName);
1673 
1674   if (const auto *F =
1675           dyn_cast<Function>(Calloc.getCallee()->stripPointerCasts()))
1676     CI->setCallingConv(F->getCallingConv());
1677 
1678   return CI;
1679 }
1680