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 |= setDoesNotCapture(F, 0);
1023     Changed |= setDoesNotCapture(F, 1);
1024     Changed |= setOnlyReadsMemory(F, 1);
1025     LLVM_FALLTHROUGH;
1026   case LibFunc_memset:
1027     Changed |= setWillReturn(F);
1028     LLVM_FALLTHROUGH;
1029   case LibFunc_memset_chk:
1030     Changed |= setOnlyAccessesArgMemory(F);
1031     Changed |= setOnlyWritesMemory(F, 0);
1032     Changed |= setDoesNotThrow(F);
1033     return Changed;
1034   // int __nvvm_reflect(const char *)
1035   case LibFunc_nvvm_reflect:
1036     Changed |= setRetAndArgsNoUndef(F);
1037     Changed |= setDoesNotAccessMemory(F);
1038     Changed |= setDoesNotThrow(F);
1039     return Changed;
1040   case LibFunc_ldexp:
1041   case LibFunc_ldexpf:
1042   case LibFunc_ldexpl:
1043     Changed |= setSignExtendedArg(F, 1);
1044     Changed |= setWillReturn(F);
1045     return Changed;
1046   case LibFunc_abs:
1047   case LibFunc_acos:
1048   case LibFunc_acosf:
1049   case LibFunc_acosh:
1050   case LibFunc_acoshf:
1051   case LibFunc_acoshl:
1052   case LibFunc_acosl:
1053   case LibFunc_asin:
1054   case LibFunc_asinf:
1055   case LibFunc_asinh:
1056   case LibFunc_asinhf:
1057   case LibFunc_asinhl:
1058   case LibFunc_asinl:
1059   case LibFunc_atan:
1060   case LibFunc_atan2:
1061   case LibFunc_atan2f:
1062   case LibFunc_atan2l:
1063   case LibFunc_atanf:
1064   case LibFunc_atanh:
1065   case LibFunc_atanhf:
1066   case LibFunc_atanhl:
1067   case LibFunc_atanl:
1068   case LibFunc_cbrt:
1069   case LibFunc_cbrtf:
1070   case LibFunc_cbrtl:
1071   case LibFunc_ceil:
1072   case LibFunc_ceilf:
1073   case LibFunc_ceill:
1074   case LibFunc_copysign:
1075   case LibFunc_copysignf:
1076   case LibFunc_copysignl:
1077   case LibFunc_cos:
1078   case LibFunc_cosh:
1079   case LibFunc_coshf:
1080   case LibFunc_coshl:
1081   case LibFunc_cosf:
1082   case LibFunc_cosl:
1083   case LibFunc_cospi:
1084   case LibFunc_cospif:
1085   case LibFunc_exp:
1086   case LibFunc_expf:
1087   case LibFunc_expl:
1088   case LibFunc_exp2:
1089   case LibFunc_exp2f:
1090   case LibFunc_exp2l:
1091   case LibFunc_expm1:
1092   case LibFunc_expm1f:
1093   case LibFunc_expm1l:
1094   case LibFunc_fabs:
1095   case LibFunc_fabsf:
1096   case LibFunc_fabsl:
1097   case LibFunc_ffs:
1098   case LibFunc_ffsl:
1099   case LibFunc_ffsll:
1100   case LibFunc_floor:
1101   case LibFunc_floorf:
1102   case LibFunc_floorl:
1103   case LibFunc_fls:
1104   case LibFunc_flsl:
1105   case LibFunc_flsll:
1106   case LibFunc_fmax:
1107   case LibFunc_fmaxf:
1108   case LibFunc_fmaxl:
1109   case LibFunc_fmin:
1110   case LibFunc_fminf:
1111   case LibFunc_fminl:
1112   case LibFunc_fmod:
1113   case LibFunc_fmodf:
1114   case LibFunc_fmodl:
1115   case LibFunc_isascii:
1116   case LibFunc_isdigit:
1117   case LibFunc_labs:
1118   case LibFunc_llabs:
1119   case LibFunc_log:
1120   case LibFunc_log10:
1121   case LibFunc_log10f:
1122   case LibFunc_log10l:
1123   case LibFunc_log1p:
1124   case LibFunc_log1pf:
1125   case LibFunc_log1pl:
1126   case LibFunc_log2:
1127   case LibFunc_log2f:
1128   case LibFunc_log2l:
1129   case LibFunc_logb:
1130   case LibFunc_logbf:
1131   case LibFunc_logbl:
1132   case LibFunc_logf:
1133   case LibFunc_logl:
1134   case LibFunc_nearbyint:
1135   case LibFunc_nearbyintf:
1136   case LibFunc_nearbyintl:
1137   case LibFunc_pow:
1138   case LibFunc_powf:
1139   case LibFunc_powl:
1140   case LibFunc_rint:
1141   case LibFunc_rintf:
1142   case LibFunc_rintl:
1143   case LibFunc_round:
1144   case LibFunc_roundf:
1145   case LibFunc_roundl:
1146   case LibFunc_sin:
1147   case LibFunc_sincospif_stret:
1148   case LibFunc_sinf:
1149   case LibFunc_sinh:
1150   case LibFunc_sinhf:
1151   case LibFunc_sinhl:
1152   case LibFunc_sinl:
1153   case LibFunc_sinpi:
1154   case LibFunc_sinpif:
1155   case LibFunc_sqrt:
1156   case LibFunc_sqrtf:
1157   case LibFunc_sqrtl:
1158   case LibFunc_tan:
1159   case LibFunc_tanf:
1160   case LibFunc_tanh:
1161   case LibFunc_tanhf:
1162   case LibFunc_tanhl:
1163   case LibFunc_tanl:
1164   case LibFunc_toascii:
1165   case LibFunc_trunc:
1166   case LibFunc_truncf:
1167   case LibFunc_truncl:
1168     Changed |= setDoesNotThrow(F);
1169     Changed |= setDoesNotFreeMemory(F);
1170     Changed |= setOnlyWritesMemory(F);
1171     Changed |= setWillReturn(F);
1172     return Changed;
1173   default:
1174     // FIXME: It'd be really nice to cover all the library functions we're
1175     // aware of here.
1176     return false;
1177   }
1178 }
1179 
1180 bool llvm::hasFloatFn(const TargetLibraryInfo *TLI, Type *Ty,
1181                       LibFunc DoubleFn, LibFunc FloatFn, LibFunc LongDoubleFn) {
1182   switch (Ty->getTypeID()) {
1183   case Type::HalfTyID:
1184     return false;
1185   case Type::FloatTyID:
1186     return TLI->has(FloatFn);
1187   case Type::DoubleTyID:
1188     return TLI->has(DoubleFn);
1189   default:
1190     return TLI->has(LongDoubleFn);
1191   }
1192 }
1193 
1194 StringRef llvm::getFloatFnName(const TargetLibraryInfo *TLI, Type *Ty,
1195                                LibFunc DoubleFn, LibFunc FloatFn,
1196                                LibFunc LongDoubleFn) {
1197   assert(hasFloatFn(TLI, Ty, DoubleFn, FloatFn, LongDoubleFn) &&
1198          "Cannot get name for unavailable function!");
1199 
1200   switch (Ty->getTypeID()) {
1201   case Type::HalfTyID:
1202     llvm_unreachable("No name for HalfTy!");
1203   case Type::FloatTyID:
1204     return TLI->getName(FloatFn);
1205   case Type::DoubleTyID:
1206     return TLI->getName(DoubleFn);
1207   default:
1208     return TLI->getName(LongDoubleFn);
1209   }
1210 }
1211 
1212 //- Emit LibCalls ------------------------------------------------------------//
1213 
1214 Value *llvm::castToCStr(Value *V, IRBuilderBase &B) {
1215   unsigned AS = V->getType()->getPointerAddressSpace();
1216   return B.CreateBitCast(V, B.getInt8PtrTy(AS), "cstr");
1217 }
1218 
1219 static Value *emitLibCall(LibFunc TheLibFunc, Type *ReturnType,
1220                           ArrayRef<Type *> ParamTypes,
1221                           ArrayRef<Value *> Operands, IRBuilderBase &B,
1222                           const TargetLibraryInfo *TLI,
1223                           bool IsVaArgs = false) {
1224   if (!TLI->has(TheLibFunc))
1225     return nullptr;
1226 
1227   Module *M = B.GetInsertBlock()->getModule();
1228   StringRef FuncName = TLI->getName(TheLibFunc);
1229   FunctionType *FuncType = FunctionType::get(ReturnType, ParamTypes, IsVaArgs);
1230   FunctionCallee Callee = M->getOrInsertFunction(FuncName, FuncType);
1231   inferLibFuncAttributes(M, FuncName, *TLI);
1232   CallInst *CI = B.CreateCall(Callee, Operands, FuncName);
1233   if (const Function *F =
1234           dyn_cast<Function>(Callee.getCallee()->stripPointerCasts()))
1235     CI->setCallingConv(F->getCallingConv());
1236   return CI;
1237 }
1238 
1239 Value *llvm::emitStrLen(Value *Ptr, IRBuilderBase &B, const DataLayout &DL,
1240                         const TargetLibraryInfo *TLI) {
1241   LLVMContext &Context = B.GetInsertBlock()->getContext();
1242   return emitLibCall(LibFunc_strlen, DL.getIntPtrType(Context),
1243                      B.getInt8PtrTy(), castToCStr(Ptr, B), B, TLI);
1244 }
1245 
1246 Value *llvm::emitStrDup(Value *Ptr, IRBuilderBase &B,
1247                         const TargetLibraryInfo *TLI) {
1248   return emitLibCall(LibFunc_strdup, B.getInt8PtrTy(), B.getInt8PtrTy(),
1249                      castToCStr(Ptr, B), B, TLI);
1250 }
1251 
1252 Value *llvm::emitStrChr(Value *Ptr, char C, IRBuilderBase &B,
1253                         const TargetLibraryInfo *TLI) {
1254   Type *I8Ptr = B.getInt8PtrTy();
1255   Type *I32Ty = B.getInt32Ty();
1256   return emitLibCall(LibFunc_strchr, I8Ptr, {I8Ptr, I32Ty},
1257                      {castToCStr(Ptr, B), ConstantInt::get(I32Ty, C)}, B, TLI);
1258 }
1259 
1260 Value *llvm::emitStrNCmp(Value *Ptr1, Value *Ptr2, Value *Len, IRBuilderBase &B,
1261                          const DataLayout &DL, const TargetLibraryInfo *TLI) {
1262   LLVMContext &Context = B.GetInsertBlock()->getContext();
1263   return emitLibCall(
1264       LibFunc_strncmp, B.getInt32Ty(),
1265       {B.getInt8PtrTy(), B.getInt8PtrTy(), DL.getIntPtrType(Context)},
1266       {castToCStr(Ptr1, B), castToCStr(Ptr2, B), Len}, B, TLI);
1267 }
1268 
1269 Value *llvm::emitStrCpy(Value *Dst, Value *Src, IRBuilderBase &B,
1270                         const TargetLibraryInfo *TLI) {
1271   Type *I8Ptr = Dst->getType();
1272   return emitLibCall(LibFunc_strcpy, I8Ptr, {I8Ptr, I8Ptr},
1273                      {castToCStr(Dst, B), castToCStr(Src, B)}, B, TLI);
1274 }
1275 
1276 Value *llvm::emitStpCpy(Value *Dst, Value *Src, IRBuilderBase &B,
1277                         const TargetLibraryInfo *TLI) {
1278   Type *I8Ptr = B.getInt8PtrTy();
1279   return emitLibCall(LibFunc_stpcpy, I8Ptr, {I8Ptr, I8Ptr},
1280                      {castToCStr(Dst, B), castToCStr(Src, B)}, B, TLI);
1281 }
1282 
1283 Value *llvm::emitStrNCpy(Value *Dst, Value *Src, Value *Len, IRBuilderBase &B,
1284                          const TargetLibraryInfo *TLI) {
1285   Type *I8Ptr = B.getInt8PtrTy();
1286   return emitLibCall(LibFunc_strncpy, I8Ptr, {I8Ptr, I8Ptr, Len->getType()},
1287                      {castToCStr(Dst, B), castToCStr(Src, B), Len}, B, TLI);
1288 }
1289 
1290 Value *llvm::emitStpNCpy(Value *Dst, Value *Src, Value *Len, IRBuilderBase &B,
1291                          const TargetLibraryInfo *TLI) {
1292   Type *I8Ptr = B.getInt8PtrTy();
1293   return emitLibCall(LibFunc_stpncpy, I8Ptr, {I8Ptr, I8Ptr, Len->getType()},
1294                      {castToCStr(Dst, B), castToCStr(Src, B), Len}, B, TLI);
1295 }
1296 
1297 Value *llvm::emitMemCpyChk(Value *Dst, Value *Src, Value *Len, Value *ObjSize,
1298                            IRBuilderBase &B, const DataLayout &DL,
1299                            const TargetLibraryInfo *TLI) {
1300   if (!TLI->has(LibFunc_memcpy_chk))
1301     return nullptr;
1302 
1303   Module *M = B.GetInsertBlock()->getModule();
1304   AttributeList AS;
1305   AS = AttributeList::get(M->getContext(), AttributeList::FunctionIndex,
1306                           Attribute::NoUnwind);
1307   LLVMContext &Context = B.GetInsertBlock()->getContext();
1308   FunctionCallee MemCpy = M->getOrInsertFunction(
1309       "__memcpy_chk", AttributeList::get(M->getContext(), AS), B.getInt8PtrTy(),
1310       B.getInt8PtrTy(), B.getInt8PtrTy(), DL.getIntPtrType(Context),
1311       DL.getIntPtrType(Context));
1312   Dst = castToCStr(Dst, B);
1313   Src = castToCStr(Src, B);
1314   CallInst *CI = B.CreateCall(MemCpy, {Dst, Src, Len, ObjSize});
1315   if (const Function *F =
1316           dyn_cast<Function>(MemCpy.getCallee()->stripPointerCasts()))
1317     CI->setCallingConv(F->getCallingConv());
1318   return CI;
1319 }
1320 
1321 Value *llvm::emitMemPCpy(Value *Dst, Value *Src, Value *Len, IRBuilderBase &B,
1322                          const DataLayout &DL, const TargetLibraryInfo *TLI) {
1323   LLVMContext &Context = B.GetInsertBlock()->getContext();
1324   return emitLibCall(
1325       LibFunc_mempcpy, B.getInt8PtrTy(),
1326       {B.getInt8PtrTy(), B.getInt8PtrTy(), DL.getIntPtrType(Context)},
1327       {Dst, Src, Len}, B, TLI);
1328 }
1329 
1330 Value *llvm::emitMemChr(Value *Ptr, Value *Val, Value *Len, IRBuilderBase &B,
1331                         const DataLayout &DL, const TargetLibraryInfo *TLI) {
1332   LLVMContext &Context = B.GetInsertBlock()->getContext();
1333   return emitLibCall(
1334       LibFunc_memchr, B.getInt8PtrTy(),
1335       {B.getInt8PtrTy(), B.getInt32Ty(), DL.getIntPtrType(Context)},
1336       {castToCStr(Ptr, B), Val, Len}, B, TLI);
1337 }
1338 
1339 Value *llvm::emitMemCmp(Value *Ptr1, Value *Ptr2, Value *Len, IRBuilderBase &B,
1340                         const DataLayout &DL, const TargetLibraryInfo *TLI) {
1341   LLVMContext &Context = B.GetInsertBlock()->getContext();
1342   return emitLibCall(
1343       LibFunc_memcmp, B.getInt32Ty(),
1344       {B.getInt8PtrTy(), B.getInt8PtrTy(), DL.getIntPtrType(Context)},
1345       {castToCStr(Ptr1, B), castToCStr(Ptr2, B), Len}, B, TLI);
1346 }
1347 
1348 Value *llvm::emitBCmp(Value *Ptr1, Value *Ptr2, Value *Len, IRBuilderBase &B,
1349                       const DataLayout &DL, const TargetLibraryInfo *TLI) {
1350   LLVMContext &Context = B.GetInsertBlock()->getContext();
1351   return emitLibCall(
1352       LibFunc_bcmp, B.getInt32Ty(),
1353       {B.getInt8PtrTy(), B.getInt8PtrTy(), DL.getIntPtrType(Context)},
1354       {castToCStr(Ptr1, B), castToCStr(Ptr2, B), Len}, B, TLI);
1355 }
1356 
1357 Value *llvm::emitMemCCpy(Value *Ptr1, Value *Ptr2, Value *Val, Value *Len,
1358                          IRBuilderBase &B, const TargetLibraryInfo *TLI) {
1359   return emitLibCall(
1360       LibFunc_memccpy, B.getInt8PtrTy(),
1361       {B.getInt8PtrTy(), B.getInt8PtrTy(), B.getInt32Ty(), Len->getType()},
1362       {Ptr1, Ptr2, Val, Len}, B, TLI);
1363 }
1364 
1365 Value *llvm::emitSNPrintf(Value *Dest, Value *Size, Value *Fmt,
1366                           ArrayRef<Value *> VariadicArgs, IRBuilderBase &B,
1367                           const TargetLibraryInfo *TLI) {
1368   SmallVector<Value *, 8> Args{castToCStr(Dest, B), Size, castToCStr(Fmt, B)};
1369   llvm::append_range(Args, VariadicArgs);
1370   return emitLibCall(LibFunc_snprintf, B.getInt32Ty(),
1371                      {B.getInt8PtrTy(), Size->getType(), B.getInt8PtrTy()},
1372                      Args, B, TLI, /*IsVaArgs=*/true);
1373 }
1374 
1375 Value *llvm::emitSPrintf(Value *Dest, Value *Fmt,
1376                          ArrayRef<Value *> VariadicArgs, IRBuilderBase &B,
1377                          const TargetLibraryInfo *TLI) {
1378   SmallVector<Value *, 8> Args{castToCStr(Dest, B), castToCStr(Fmt, B)};
1379   llvm::append_range(Args, VariadicArgs);
1380   return emitLibCall(LibFunc_sprintf, B.getInt32Ty(),
1381                      {B.getInt8PtrTy(), B.getInt8PtrTy()}, Args, B, TLI,
1382                      /*IsVaArgs=*/true);
1383 }
1384 
1385 Value *llvm::emitStrCat(Value *Dest, Value *Src, IRBuilderBase &B,
1386                         const TargetLibraryInfo *TLI) {
1387   return emitLibCall(LibFunc_strcat, B.getInt8PtrTy(),
1388                      {B.getInt8PtrTy(), B.getInt8PtrTy()},
1389                      {castToCStr(Dest, B), castToCStr(Src, B)}, B, TLI);
1390 }
1391 
1392 Value *llvm::emitStrLCpy(Value *Dest, Value *Src, Value *Size, IRBuilderBase &B,
1393                          const TargetLibraryInfo *TLI) {
1394   return emitLibCall(LibFunc_strlcpy, Size->getType(),
1395                      {B.getInt8PtrTy(), B.getInt8PtrTy(), Size->getType()},
1396                      {castToCStr(Dest, B), castToCStr(Src, B), Size}, B, TLI);
1397 }
1398 
1399 Value *llvm::emitStrLCat(Value *Dest, Value *Src, Value *Size, IRBuilderBase &B,
1400                          const TargetLibraryInfo *TLI) {
1401   return emitLibCall(LibFunc_strlcat, Size->getType(),
1402                      {B.getInt8PtrTy(), B.getInt8PtrTy(), Size->getType()},
1403                      {castToCStr(Dest, B), castToCStr(Src, B), Size}, B, TLI);
1404 }
1405 
1406 Value *llvm::emitStrNCat(Value *Dest, Value *Src, Value *Size, IRBuilderBase &B,
1407                          const TargetLibraryInfo *TLI) {
1408   return emitLibCall(LibFunc_strncat, B.getInt8PtrTy(),
1409                      {B.getInt8PtrTy(), B.getInt8PtrTy(), Size->getType()},
1410                      {castToCStr(Dest, B), castToCStr(Src, B), Size}, B, TLI);
1411 }
1412 
1413 Value *llvm::emitVSNPrintf(Value *Dest, Value *Size, Value *Fmt, Value *VAList,
1414                            IRBuilderBase &B, const TargetLibraryInfo *TLI) {
1415   return emitLibCall(
1416       LibFunc_vsnprintf, B.getInt32Ty(),
1417       {B.getInt8PtrTy(), Size->getType(), B.getInt8PtrTy(), VAList->getType()},
1418       {castToCStr(Dest, B), Size, castToCStr(Fmt, B), VAList}, B, TLI);
1419 }
1420 
1421 Value *llvm::emitVSPrintf(Value *Dest, Value *Fmt, Value *VAList,
1422                           IRBuilderBase &B, const TargetLibraryInfo *TLI) {
1423   return emitLibCall(LibFunc_vsprintf, B.getInt32Ty(),
1424                      {B.getInt8PtrTy(), B.getInt8PtrTy(), VAList->getType()},
1425                      {castToCStr(Dest, B), castToCStr(Fmt, B), VAList}, B, TLI);
1426 }
1427 
1428 /// Append a suffix to the function name according to the type of 'Op'.
1429 static void appendTypeSuffix(Value *Op, StringRef &Name,
1430                              SmallString<20> &NameBuffer) {
1431   if (!Op->getType()->isDoubleTy()) {
1432       NameBuffer += Name;
1433 
1434     if (Op->getType()->isFloatTy())
1435       NameBuffer += 'f';
1436     else
1437       NameBuffer += 'l';
1438 
1439     Name = NameBuffer;
1440   }
1441 }
1442 
1443 static Value *emitUnaryFloatFnCallHelper(Value *Op, StringRef Name,
1444                                          IRBuilderBase &B,
1445                                          const AttributeList &Attrs) {
1446   assert((Name != "") && "Must specify Name to emitUnaryFloatFnCall");
1447 
1448   Module *M = B.GetInsertBlock()->getModule();
1449   FunctionCallee Callee =
1450       M->getOrInsertFunction(Name, Op->getType(), Op->getType());
1451   CallInst *CI = B.CreateCall(Callee, Op, Name);
1452 
1453   // The incoming attribute set may have come from a speculatable intrinsic, but
1454   // is being replaced with a library call which is not allowed to be
1455   // speculatable.
1456   CI->setAttributes(
1457       Attrs.removeFnAttribute(B.getContext(), Attribute::Speculatable));
1458   if (const Function *F =
1459           dyn_cast<Function>(Callee.getCallee()->stripPointerCasts()))
1460     CI->setCallingConv(F->getCallingConv());
1461 
1462   return CI;
1463 }
1464 
1465 Value *llvm::emitUnaryFloatFnCall(Value *Op, StringRef Name, IRBuilderBase &B,
1466                                   const AttributeList &Attrs) {
1467   SmallString<20> NameBuffer;
1468   appendTypeSuffix(Op, Name, NameBuffer);
1469 
1470   return emitUnaryFloatFnCallHelper(Op, Name, B, Attrs);
1471 }
1472 
1473 Value *llvm::emitUnaryFloatFnCall(Value *Op, const TargetLibraryInfo *TLI,
1474                                   LibFunc DoubleFn, LibFunc FloatFn,
1475                                   LibFunc LongDoubleFn, IRBuilderBase &B,
1476                                   const AttributeList &Attrs) {
1477   // Get the name of the function according to TLI.
1478   StringRef Name = getFloatFnName(TLI, Op->getType(),
1479                                   DoubleFn, FloatFn, LongDoubleFn);
1480 
1481   return emitUnaryFloatFnCallHelper(Op, Name, B, Attrs);
1482 }
1483 
1484 static Value *emitBinaryFloatFnCallHelper(Value *Op1, Value *Op2,
1485                                           StringRef Name, IRBuilderBase &B,
1486                                           const AttributeList &Attrs,
1487                                           const TargetLibraryInfo *TLI = nullptr) {
1488   assert((Name != "") && "Must specify Name to emitBinaryFloatFnCall");
1489 
1490   Module *M = B.GetInsertBlock()->getModule();
1491   FunctionCallee Callee = M->getOrInsertFunction(Name, Op1->getType(),
1492                                                  Op1->getType(), Op2->getType());
1493   if (TLI != nullptr)
1494     inferLibFuncAttributes(M, Name, *TLI);
1495   CallInst *CI = B.CreateCall(Callee, { Op1, Op2 }, Name);
1496 
1497   // The incoming attribute set may have come from a speculatable intrinsic, but
1498   // is being replaced with a library call which is not allowed to be
1499   // speculatable.
1500   CI->setAttributes(
1501       Attrs.removeFnAttribute(B.getContext(), Attribute::Speculatable));
1502   if (const Function *F =
1503           dyn_cast<Function>(Callee.getCallee()->stripPointerCasts()))
1504     CI->setCallingConv(F->getCallingConv());
1505 
1506   return CI;
1507 }
1508 
1509 Value *llvm::emitBinaryFloatFnCall(Value *Op1, Value *Op2, StringRef Name,
1510                                    IRBuilderBase &B,
1511                                    const AttributeList &Attrs) {
1512   assert((Name != "") && "Must specify Name to emitBinaryFloatFnCall");
1513 
1514   SmallString<20> NameBuffer;
1515   appendTypeSuffix(Op1, Name, NameBuffer);
1516 
1517   return emitBinaryFloatFnCallHelper(Op1, Op2, Name, B, Attrs);
1518 }
1519 
1520 Value *llvm::emitBinaryFloatFnCall(Value *Op1, Value *Op2,
1521                                    const TargetLibraryInfo *TLI,
1522                                    LibFunc DoubleFn, LibFunc FloatFn,
1523                                    LibFunc LongDoubleFn, IRBuilderBase &B,
1524                                    const AttributeList &Attrs) {
1525   // Get the name of the function according to TLI.
1526   StringRef Name = getFloatFnName(TLI, Op1->getType(),
1527                                   DoubleFn, FloatFn, LongDoubleFn);
1528 
1529   return emitBinaryFloatFnCallHelper(Op1, Op2, Name, B, Attrs, TLI);
1530 }
1531 
1532 Value *llvm::emitPutChar(Value *Char, IRBuilderBase &B,
1533                          const TargetLibraryInfo *TLI) {
1534   if (!TLI->has(LibFunc_putchar))
1535     return nullptr;
1536 
1537   Module *M = B.GetInsertBlock()->getModule();
1538   StringRef PutCharName = TLI->getName(LibFunc_putchar);
1539   FunctionCallee PutChar =
1540       M->getOrInsertFunction(PutCharName, B.getInt32Ty(), B.getInt32Ty());
1541   inferLibFuncAttributes(M, PutCharName, *TLI);
1542   CallInst *CI = B.CreateCall(PutChar,
1543                               B.CreateIntCast(Char,
1544                               B.getInt32Ty(),
1545                               /*isSigned*/true,
1546                               "chari"),
1547                               PutCharName);
1548 
1549   if (const Function *F =
1550           dyn_cast<Function>(PutChar.getCallee()->stripPointerCasts()))
1551     CI->setCallingConv(F->getCallingConv());
1552   return CI;
1553 }
1554 
1555 Value *llvm::emitPutS(Value *Str, IRBuilderBase &B,
1556                       const TargetLibraryInfo *TLI) {
1557   if (!TLI->has(LibFunc_puts))
1558     return nullptr;
1559 
1560   Module *M = B.GetInsertBlock()->getModule();
1561   StringRef PutsName = TLI->getName(LibFunc_puts);
1562   FunctionCallee PutS =
1563       M->getOrInsertFunction(PutsName, B.getInt32Ty(), B.getInt8PtrTy());
1564   inferLibFuncAttributes(M, PutsName, *TLI);
1565   CallInst *CI = B.CreateCall(PutS, castToCStr(Str, B), PutsName);
1566   if (const Function *F =
1567           dyn_cast<Function>(PutS.getCallee()->stripPointerCasts()))
1568     CI->setCallingConv(F->getCallingConv());
1569   return CI;
1570 }
1571 
1572 Value *llvm::emitFPutC(Value *Char, Value *File, IRBuilderBase &B,
1573                        const TargetLibraryInfo *TLI) {
1574   if (!TLI->has(LibFunc_fputc))
1575     return nullptr;
1576 
1577   Module *M = B.GetInsertBlock()->getModule();
1578   StringRef FPutcName = TLI->getName(LibFunc_fputc);
1579   FunctionCallee F = M->getOrInsertFunction(FPutcName, B.getInt32Ty(),
1580                                             B.getInt32Ty(), File->getType());
1581   if (File->getType()->isPointerTy())
1582     inferLibFuncAttributes(M, FPutcName, *TLI);
1583   Char = B.CreateIntCast(Char, B.getInt32Ty(), /*isSigned*/true,
1584                          "chari");
1585   CallInst *CI = B.CreateCall(F, {Char, File}, FPutcName);
1586 
1587   if (const Function *Fn =
1588           dyn_cast<Function>(F.getCallee()->stripPointerCasts()))
1589     CI->setCallingConv(Fn->getCallingConv());
1590   return CI;
1591 }
1592 
1593 Value *llvm::emitFPutS(Value *Str, Value *File, IRBuilderBase &B,
1594                        const TargetLibraryInfo *TLI) {
1595   if (!TLI->has(LibFunc_fputs))
1596     return nullptr;
1597 
1598   Module *M = B.GetInsertBlock()->getModule();
1599   StringRef FPutsName = TLI->getName(LibFunc_fputs);
1600   FunctionCallee F = M->getOrInsertFunction(FPutsName, B.getInt32Ty(),
1601                                             B.getInt8PtrTy(), File->getType());
1602   if (File->getType()->isPointerTy())
1603     inferLibFuncAttributes(M, FPutsName, *TLI);
1604   CallInst *CI = B.CreateCall(F, {castToCStr(Str, B), File}, FPutsName);
1605 
1606   if (const Function *Fn =
1607           dyn_cast<Function>(F.getCallee()->stripPointerCasts()))
1608     CI->setCallingConv(Fn->getCallingConv());
1609   return CI;
1610 }
1611 
1612 Value *llvm::emitFWrite(Value *Ptr, Value *Size, Value *File, IRBuilderBase &B,
1613                         const DataLayout &DL, const TargetLibraryInfo *TLI) {
1614   if (!TLI->has(LibFunc_fwrite))
1615     return nullptr;
1616 
1617   Module *M = B.GetInsertBlock()->getModule();
1618   LLVMContext &Context = B.GetInsertBlock()->getContext();
1619   StringRef FWriteName = TLI->getName(LibFunc_fwrite);
1620   FunctionCallee F = M->getOrInsertFunction(
1621       FWriteName, DL.getIntPtrType(Context), B.getInt8PtrTy(),
1622       DL.getIntPtrType(Context), DL.getIntPtrType(Context), File->getType());
1623 
1624   if (File->getType()->isPointerTy())
1625     inferLibFuncAttributes(M, FWriteName, *TLI);
1626   CallInst *CI =
1627       B.CreateCall(F, {castToCStr(Ptr, B), Size,
1628                        ConstantInt::get(DL.getIntPtrType(Context), 1), File});
1629 
1630   if (const Function *Fn =
1631           dyn_cast<Function>(F.getCallee()->stripPointerCasts()))
1632     CI->setCallingConv(Fn->getCallingConv());
1633   return CI;
1634 }
1635 
1636 Value *llvm::emitMalloc(Value *Num, IRBuilderBase &B, const DataLayout &DL,
1637                         const TargetLibraryInfo *TLI) {
1638   if (!TLI->has(LibFunc_malloc))
1639     return nullptr;
1640 
1641   Module *M = B.GetInsertBlock()->getModule();
1642   StringRef MallocName = TLI->getName(LibFunc_malloc);
1643   LLVMContext &Context = B.GetInsertBlock()->getContext();
1644   FunctionCallee Malloc = M->getOrInsertFunction(MallocName, B.getInt8PtrTy(),
1645                                                  DL.getIntPtrType(Context));
1646   inferLibFuncAttributes(M, MallocName, *TLI);
1647   CallInst *CI = B.CreateCall(Malloc, Num, MallocName);
1648 
1649   if (const Function *F =
1650           dyn_cast<Function>(Malloc.getCallee()->stripPointerCasts()))
1651     CI->setCallingConv(F->getCallingConv());
1652 
1653   return CI;
1654 }
1655 
1656 Value *llvm::emitCalloc(Value *Num, Value *Size, IRBuilderBase &B,
1657                         const TargetLibraryInfo &TLI) {
1658   if (!TLI.has(LibFunc_calloc))
1659     return nullptr;
1660 
1661   Module *M = B.GetInsertBlock()->getModule();
1662   StringRef CallocName = TLI.getName(LibFunc_calloc);
1663   const DataLayout &DL = M->getDataLayout();
1664   IntegerType *PtrType = DL.getIntPtrType((B.GetInsertBlock()->getContext()));
1665   FunctionCallee Calloc =
1666       M->getOrInsertFunction(CallocName, B.getInt8PtrTy(), PtrType, PtrType);
1667   inferLibFuncAttributes(M, CallocName, TLI);
1668   CallInst *CI = B.CreateCall(Calloc, {Num, Size}, CallocName);
1669 
1670   if (const auto *F =
1671           dyn_cast<Function>(Calloc.getCallee()->stripPointerCasts()))
1672     CI->setCallingConv(F->getCallingConv());
1673 
1674   return CI;
1675 }
1676