Bug Summary

File:build/libiberty/cplus-dem.c
Warning:line 196, column 3
Undefined or garbage value returned to caller

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-unknown-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name cplus-dem.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model static -mframe-pointer=none -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -fno-split-dwarf-inlining -debugger-tuning=gdb -resource-dir /usr/lib64/clang/11.0.0 -D HAVE_CONFIG_H -I . -I /home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-clang-static-analyzer/build/libiberty/../include -D _GNU_SOURCE -internal-isystem /usr/local/include -internal-isystem /usr/lib64/clang/11.0.0/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wwrite-strings -fconst-strings -fdebug-compilation-dir /home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-clang-static-analyzer/objdir/build-x86_64-pc-linux-gnu/libiberty -ferror-limit 19 -fcf-protection=full -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-output=plist-html -analyzer-config silence-checkers=core.NullDereference -faddrsig -o /home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-clang-static-analyzer/objdir/clang-static-analyzer/2021-01-16-135054-17580-1/report-EilGCj.plist -x c /home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-clang-static-analyzer/build/libiberty/cplus-dem.c
1/* Demangler for GNU C++
2 Copyright (C) 1989-2021 Free Software Foundation, Inc.
3 Written by James Clark (jjc@jclark.uucp)
4 Rewritten by Fred Fish (fnf@cygnus.com) for ARM and Lucid demangling
5 Modified by Satish Pai (pai@apollo.hp.com) for HP demangling
6
7This file is part of the libiberty library.
8Libiberty is free software; you can redistribute it and/or
9modify it under the terms of the GNU Library General Public
10License as published by the Free Software Foundation; either
11version 2 of the License, or (at your option) any later version.
12
13In addition to the permissions in the GNU Library General Public
14License, the Free Software Foundation gives you unlimited permission
15to link the compiled version of this file into combinations with other
16programs, and to distribute those combinations without any restriction
17coming from the use of this file. (The Library Public License
18restrictions do apply in other respects; for example, they cover
19modification of the file, and distribution when not linked into a
20combined executable.)
21
22Libiberty is distributed in the hope that it will be useful,
23but WITHOUT ANY WARRANTY; without even the implied warranty of
24MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25Library General Public License for more details.
26
27You should have received a copy of the GNU Library General Public
28License along with libiberty; see the file COPYING.LIB. If
29not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
30Boston, MA 02110-1301, USA. */
31
32/* This file lives in both GCC and libiberty. When making changes, please
33 try not to break either. */
34
35#ifdef HAVE_CONFIG_H1
36#include "config.h"
37#endif
38
39#include "safe-ctype.h"
40
41#include <string.h>
42
43#ifdef HAVE_STDLIB_H1
44#include <stdlib.h>
45#else
46void * malloc ();
47void * realloc ();
48#endif
49
50#include <demangle.h>
51#undef CURRENT_DEMANGLING_STYLEoptions
52#define CURRENT_DEMANGLING_STYLEoptions options
53
54#include "libiberty.h"
55
56enum demangling_styles current_demangling_style = auto_demangling;
57
58const struct demangler_engine libiberty_demanglers[] =
59{
60 {
61 NO_DEMANGLING_STYLE_STRING"none",
62 no_demangling,
63 "Demangling disabled"
64 }
65 ,
66 {
67 AUTO_DEMANGLING_STYLE_STRING"auto",
68 auto_demangling,
69 "Automatic selection based on executable"
70 }
71 ,
72 {
73 GNU_V3_DEMANGLING_STYLE_STRING"gnu-v3",
74 gnu_v3_demangling,
75 "GNU (g++) V3 (Itanium C++ ABI) style demangling"
76 }
77 ,
78 {
79 JAVA_DEMANGLING_STYLE_STRING"java",
80 java_demangling,
81 "Java style demangling"
82 }
83 ,
84 {
85 GNAT_DEMANGLING_STYLE_STRING"gnat",
86 gnat_demangling,
87 "GNAT style demangling"
88 }
89 ,
90 {
91 DLANG_DEMANGLING_STYLE_STRING"dlang",
92 dlang_demangling,
93 "DLANG style demangling"
94 }
95 ,
96 {
97 RUST_DEMANGLING_STYLE_STRING"rust",
98 rust_demangling,
99 "Rust style demangling"
100 }
101 ,
102 {
103 NULL((void*)0), unknown_demangling, NULL((void*)0)
104 }
105};
106
107/* Add a routine to set the demangling style to be sure it is valid and
108 allow for any demangler initialization that maybe necessary. */
109
110enum demangling_styles
111cplus_demangle_set_style (enum demangling_styles style)
112{
113 const struct demangler_engine *demangler = libiberty_demanglers;
114
115 for (; demangler->demangling_style != unknown_demangling; ++demangler)
116 if (style == demangler->demangling_style)
117 {
118 current_demangling_style = style;
119 return current_demangling_style;
120 }
121
122 return unknown_demangling;
123}
124
125/* Do string name to style translation */
126
127enum demangling_styles
128cplus_demangle_name_to_style (const char *name)
129{
130 const struct demangler_engine *demangler = libiberty_demanglers;
131
132 for (; demangler->demangling_style != unknown_demangling; ++demangler)
133 if (strcmp (name, demangler->demangling_style_name) == 0)
134 return demangler->demangling_style;
135
136 return unknown_demangling;
137}
138
139/* char *cplus_demangle (const char *mangled, int options)
140
141 If MANGLED is a mangled function name produced by GNU C++, then
142 a pointer to a @code{malloc}ed string giving a C++ representation
143 of the name will be returned; otherwise NULL will be returned.
144 It is the caller's responsibility to free the string which
145 is returned.
146
147 Note that any leading underscores, or other such characters prepended by
148 the compilation system, are presumed to have already been stripped from
149 MANGLED. */
150
151char *
152cplus_demangle (const char *mangled, int options)
153{
154 char *ret;
1
'ret' declared without an initial value
155
156 if (current_demangling_style == no_demangling)
2
Assuming 'current_demangling_style' is not equal to no_demangling
3
Taking false branch
157 return xstrdup (mangled);
158
159 if ((options & DMGL_STYLE_MASK((1 << 8)|(1 << 14)|(1 << 2)|(1 << 15
)|(1 << 16)|(1 << 17))
) == 0
)
4
Assuming the condition is false
5
Taking false branch
160 options |= (int) current_demangling_style & DMGL_STYLE_MASK((1 << 8)|(1 << 14)|(1 << 2)|(1 << 15
)|(1 << 16)|(1 << 17))
;
161
162 /* The Rust demangling is implemented elsewhere.
163 Legacy Rust symbols overlap with GNU_V3, so try Rust first. */
164 if (RUST_DEMANGLING(((int) options) & (1 << 17)) || AUTO_DEMANGLING(((int) options) & (1 << 8)))
6
Assuming the condition is false
7
Assuming the condition is false
8
Taking false branch
165 {
166 ret = rust_demangle (mangled, options);
167 if (ret || RUST_DEMANGLING(((int) options) & (1 << 17)))
168 return ret;
169 }
170
171 /* The V3 ABI demangling is implemented elsewhere. */
172 if (GNU_V3_DEMANGLING(((int) options) & (1 << 14)) || AUTO_DEMANGLING(((int) options) & (1 << 8)))
9
Assuming the condition is false
10
Taking false branch
173 {
174 ret = cplus_demangle_v3 (mangled, options);
175 if (ret || GNU_V3_DEMANGLING(((int) options) & (1 << 14)))
176 return ret;
177 }
178
179 if (JAVA_DEMANGLING(((int) options) & (1 << 2)))
11
Assuming the condition is false
12
Taking false branch
180 {
181 ret = java_demangle_v3 (mangled);
182 if (ret)
183 return ret;
184 }
185
186 if (GNAT_DEMANGLING(((int) options) & (1 << 15)))
13
Assuming the condition is false
14
Taking false branch
187 return ada_demangle (mangled, options);
188
189 if (DLANG_DEMANGLING(((int) options) & (1 << 16)))
15
Assuming the condition is false
16
Taking false branch
190 {
191 ret = dlang_demangle (mangled, options);
192 if (ret)
193 return ret;
194 }
195
196 return (ret);
17
Undefined or garbage value returned to caller
197}
198
199/* Demangle ada names. The encoding is documented in gcc/ada/exp_dbug.ads. */
200
201char *
202ada_demangle (const char *mangled, int option ATTRIBUTE_UNUSED__attribute__ ((__unused__)))
203{
204 int len0;
205 const char* p;
206 char *d;
207 char *demangled = NULL((void*)0);
208
209 /* Discard leading _ada_, which is used for library level subprograms. */
210 if (strncmp (mangled, "_ada_", 5) == 0)
211 mangled += 5;
212
213 /* All ada unit names are lower-case. */
214 if (!ISLOWER (mangled[0])(_sch_istable[(mangled[0]) & 0xff] & (unsigned short)
(_sch_islower))
)
215 goto unknown;
216
217 /* Most of the demangling will trivially remove chars. Operator names
218 may add one char but because they are always preceeded by '__' which is
219 replaced by '.', they eventually never expand the size.
220 A few special names such as '___elabs' add a few chars (at most 7), but
221 they occur only once. */
222 len0 = strlen (mangled) + 7 + 1;
223 demangled = XNEWVEC (char, len0)((char *) xmalloc (sizeof (char) * (len0)));
224
225 d = demangled;
226 p = mangled;
227 while (1)
228 {
229 /* An entity names is expected. */
230 if (ISLOWER (*p)(_sch_istable[(*p) & 0xff] & (unsigned short)(_sch_islower
))
)
231 {
232 /* An identifier, which is always lower case. */
233 do
234 *d++ = *p++;
235 while (ISLOWER(*p)(_sch_istable[(*p) & 0xff] & (unsigned short)(_sch_islower
))
|| ISDIGIT (*p)(_sch_istable[(*p) & 0xff] & (unsigned short)(_sch_isdigit
))
236 || (p[0] == '_' && (ISLOWER (p[1])(_sch_istable[(p[1]) & 0xff] & (unsigned short)(_sch_islower
))
|| ISDIGIT (p[1])(_sch_istable[(p[1]) & 0xff] & (unsigned short)(_sch_isdigit
))
)));
237 }
238 else if (p[0] == 'O')
239 {
240 /* An operator name. */
241 static const char * const operators[][2] =
242 {{"Oabs", "abs"}, {"Oand", "and"}, {"Omod", "mod"},
243 {"Onot", "not"}, {"Oor", "or"}, {"Orem", "rem"},
244 {"Oxor", "xor"}, {"Oeq", "="}, {"One", "/="},
245 {"Olt", "<"}, {"Ole", "<="}, {"Ogt", ">"},
246 {"Oge", ">="}, {"Oadd", "+"}, {"Osubtract", "-"},
247 {"Oconcat", "&"}, {"Omultiply", "*"}, {"Odivide", "/"},
248 {"Oexpon", "**"}, {NULL((void*)0), NULL((void*)0)}};
249 int k;
250
251 for (k = 0; operators[k][0] != NULL((void*)0); k++)
252 {
253 size_t slen = strlen (operators[k][0]);
254 if (strncmp (p, operators[k][0], slen) == 0)
255 {
256 p += slen;
257 slen = strlen (operators[k][1]);
258 *d++ = '"';
259 memcpy (d, operators[k][1], slen);
260 d += slen;
261 *d++ = '"';
262 break;
263 }
264 }
265 /* Operator not found. */
266 if (operators[k][0] == NULL((void*)0))
267 goto unknown;
268 }
269 else
270 {
271 /* Not a GNAT encoding. */
272 goto unknown;
273 }
274
275 /* The name can be directly followed by some uppercase letters. */
276 if (p[0] == 'T' && p[1] == 'K')
277 {
278 /* Task stuff. */
279 if (p[2] == 'B' && p[3] == 0)
280 {
281 /* Subprogram for task body. */
282 break;
283 }
284 else if (p[2] == '_' && p[3] == '_')
285 {
286 /* Inner declarations in a task. */
287 p += 4;
288 *d++ = '.';
289 continue;
290 }
291 else
292 goto unknown;
293 }
294 if (p[0] == 'E' && p[1] == 0)
295 {
296 /* Exception name. */
297 goto unknown;
298 }
299 if ((p[0] == 'P' || p[0] == 'N') && p[1] == 0)
300 {
301 /* Protected type subprogram. */
302 break;
303 }
304 if ((*p == 'N' || *p == 'S') && p[1] == 0)
305 {
306 /* Enumerated type name table. */
307 goto unknown;
308 }
309 if (p[0] == 'X')
310 {
311 /* Body nested. */
312 p++;
313 while (p[0] == 'n' || p[0] == 'b')
314 p++;
315 }
316 if (p[0] == 'S' && p[1] != 0 && (p[2] == '_' || p[2] == 0))
317 {
318 /* Stream operations. */
319 const char *name;
320 switch (p[1])
321 {
322 case 'R':
323 name = "'Read";
324 break;
325 case 'W':
326 name = "'Write";
327 break;
328 case 'I':
329 name = "'Input";
330 break;
331 case 'O':
332 name = "'Output";
333 break;
334 default:
335 goto unknown;
336 }
337 p += 2;
338 strcpy (d, name);
339 d += strlen (name);
340 }
341 else if (p[0] == 'D')
342 {
343 /* Controlled type operation. */
344 const char *name;
345 switch (p[1])
346 {
347 case 'F':
348 name = ".Finalize";
349 break;
350 case 'A':
351 name = ".Adjust";
352 break;
353 default:
354 goto unknown;
355 }
356 strcpy (d, name);
357 d += strlen (name);
358 break;
359 }
360
361 if (p[0] == '_')
362 {
363 /* Separator. */
364 if (p[1] == '_')
365 {
366 /* Standard separator. Handled first. */
367 p += 2;
368
369 if (ISDIGIT (*p)(_sch_istable[(*p) & 0xff] & (unsigned short)(_sch_isdigit
))
)
370 {
371 /* Overloading number. */
372 do
373 p++;
374 while (ISDIGIT (*p)(_sch_istable[(*p) & 0xff] & (unsigned short)(_sch_isdigit
))
|| (p[0] == '_' && ISDIGIT (p[1])(_sch_istable[(p[1]) & 0xff] & (unsigned short)(_sch_isdigit
))
));
375 if (*p == 'X')
376 {
377 p++;
378 while (p[0] == 'n' || p[0] == 'b')
379 p++;
380 }
381 }
382 else if (p[0] == '_' && p[1] != '_')
383 {
384 /* Special names. */
385 static const char * const special[][2] = {
386 { "_elabb", "'Elab_Body" },
387 { "_elabs", "'Elab_Spec" },
388 { "_size", "'Size" },
389 { "_alignment", "'Alignment" },
390 { "_assign", ".\":=\"" },
391 { NULL((void*)0), NULL((void*)0) }
392 };
393 int k;
394
395 for (k = 0; special[k][0] != NULL((void*)0); k++)
396 {
397 size_t slen = strlen (special[k][0]);
398 if (strncmp (p, special[k][0], slen) == 0)
399 {
400 p += slen;
401 slen = strlen (special[k][1]);
402 memcpy (d, special[k][1], slen);
403 d += slen;
404 break;
405 }
406 }
407 if (special[k][0] != NULL((void*)0))
408 break;
409 else
410 goto unknown;
411 }
412 else
413 {
414 *d++ = '.';
415 continue;
416 }
417 }
418 else if (p[1] == 'B' || p[1] == 'E')
419 {
420 /* Entry Body or barrier Evaluation. */
421 p += 2;
422 while (ISDIGIT (*p)(_sch_istable[(*p) & 0xff] & (unsigned short)(_sch_isdigit
))
)
423 p++;
424 if (p[0] == 's' && p[1] == 0)
425 break;
426 else
427 goto unknown;
428 }
429 else
430 goto unknown;
431 }
432
433 if (p[0] == '.' && ISDIGIT (p[1])(_sch_istable[(p[1]) & 0xff] & (unsigned short)(_sch_isdigit
))
)
434 {
435 /* Nested subprogram. */
436 p += 2;
437 while (ISDIGIT (*p)(_sch_istable[(*p) & 0xff] & (unsigned short)(_sch_isdigit
))
)
438 p++;
439 }
440 if (*p == 0)
441 {
442 /* End of mangled name. */
443 break;
444 }
445 else
446 goto unknown;
447 }
448 *d = 0;
449 return demangled;
450
451 unknown:
452 XDELETEVEC (demangled)free ((void*) (demangled));
453 len0 = strlen (mangled);
454 demangled = XNEWVEC (char, len0 + 3)((char *) xmalloc (sizeof (char) * (len0 + 3)));
455
456 if (mangled[0] == '<')
457 strcpy (demangled, mangled);
458 else
459 sprintf (demangled, "<%s>", mangled);
460
461 return demangled;
462}