| blob | d3efdf1fde8332a30c70e009145c1860ace80d9d |
1 /* stabs.c -- Parse stabs debugging information
2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
3 Free Software Foundation, Inc.
4 Written by Ian Lance Taylor <ian@cygnus.com>.
6 This file is part of GNU Binutils.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
21 02111-1307, USA. */
23 /* This file contains code which parses stabs debugging information.
24 The organization of this code is based on the gdb stabs reading
25 code. The job it does is somewhat different, because it is not
26 trying to identify the correct address for anything. */
28 #include <stdio.h>
39 /* Meaningless definition needs by aout64.h. FIXME. */
40 #define BYTES_IN_WORD 4
45 /* The number of predefined XCOFF types. */
47 #define XCOFF_TYPE_COUNT 34
49 /* This structure is used as a handle so that the stab parsing doesn't
50 need to use any static variables. */
52 struct stab_handle
53 {
54 /* The BFD. */
56 /* True if this is stabs in sections. */
57 boolean sections;
58 /* The symbol table. */
60 /* The number of symbols. */
62 /* The accumulated file name string. */
64 /* The value of the last N_SO symbol. */
65 bfd_vma so_value;
66 /* The value of the start of the file, so that we can handle file
67 relative N_LBRAC and N_RBRAC symbols. */
68 bfd_vma file_start_offset;
69 /* The offset of the start of the function, so that we can handle
70 function relative N_LBRAC and N_RBRAC symbols. */
71 bfd_vma function_start_offset;
72 /* The version number of gcc which compiled the current compilation
73 unit, 0 if not compiled by gcc. */
75 /* Whether an N_OPT symbol was seen that was not generated by gcc,
76 so that we can detect the SunPRO compiler. */
77 boolean n_opt_found;
78 /* The main file name. */
80 /* A stack of unfinished N_BINCL files. */
82 /* A list of finished N_BINCL files. */
84 /* Whether we are inside a function or not. */
85 boolean within_function;
86 /* The address of the end of the function, used if we have seen an
87 N_FUN symbol while in a function. This is -1 if we have not seen
88 an N_FUN (the normal case). */
89 bfd_vma function_end;
90 /* The depth of block nesting. */
92 /* List of pending variable definitions. */
94 /* Number of files for which we have types. */
96 /* Lists of types per file. */
98 /* Predefined XCOFF types. */
100 /* Undefined tags. */
102 /* Set by parse_stab_type if it sees a structure defined as a cross
103 reference to itself. Reset by parse_stab_type otherwise. */
104 boolean self_crossref;
105 };
107 /* A list of these structures is used to hold pending variable
108 definitions seen before the N_LBRAC of a block. */
110 struct stab_pending_var
111 {
112 /* Next pending variable definition. */
114 /* Name. */
116 /* Type. */
117 debug_type type;
118 /* Kind. */
120 /* Value. */
121 bfd_vma val;
122 };
124 /* A list of these structures is used to hold the types for a single
125 file. */
127 struct stab_types
128 {
129 /* Next set of slots for this file. */
131 /* Types indexed by type number. */
132 #define STAB_TYPES_SLOTS (16)
134 };
136 /* We keep a list of undefined tags that we encounter, so that we can
137 fill them in if the tag is later defined. */
139 struct stab_tag
140 {
141 /* Next undefined tag. */
143 /* Tag name. */
145 /* Type kind. */
147 /* Slot to hold real type when we discover it. If we don't, we fill
148 in an undefined tag type. */
149 debug_type slot;
150 /* Indirect type we have created to point at slot. */
151 debug_type type;
152 };
158 static boolean parse_stab_string
160 static debug_type parse_stab_type
162 debug_type **));
163 static boolean parse_stab_type_number
165 static debug_type parse_stab_range_type
169 static debug_type parse_stab_sun_floating_type
172 static debug_type parse_stab_struct_type
175 static boolean parse_stab_baseclasses
177 static boolean parse_stab_struct_fields
179 boolean *));
180 static boolean parse_stab_cpp_abbrev
182 static boolean parse_stab_one_struct_field
185 static boolean parse_stab_members
188 static debug_type parse_stab_argtypes
191 static boolean parse_stab_tilde_field
194 static debug_type parse_stab_array_type
198 static boolean find_excl
200 static boolean stab_record_variable
206 static debug_type stab_find_type
208 static boolean stab_record_type
210 static debug_type stab_xcoff_builtin_type
212 static debug_type stab_find_tagged_type
218 /* Save a string in memory. */
224 {
231 }
233 /* Read a number from a string. */
235 static bfd_vma
239 {
251 {
252 /* If bfd_vma is larger than unsigned long, and the number is
253 meant to be negative, we have to make sure that we sign
254 extend properly. */
258 }
260 /* Note that even though strtoul overflowed, it should have set *pp
261 to the end of the number, which is where we want it. */
264 {
266 boolean neg;
269 boolean overflow;
270 bfd_vma v;
272 /* Our own version of strtoul, for a bfd_vma. */
280 {
283 }
287 {
289 {
292 }
293 else
294 {
297 }
298 }
306 {
316 else
323 {
326 }
327 }
330 {
334 }
335 }
337 /* If we get here, the number is too large to represent in a
338 bfd_vma. */
342 else
346 }
348 /* Give an error for a bad stab string. */
350 static void
353 {
355 }
357 /* Warn about something in a stab string. */
359 static void
363 {
365 }
367 /* Create a handle to parse stabs symbols with. */
369 PTR
371 PTR dhandle ATTRIBUTE_UNUSED;
373 boolean sections;
376 {
390 }
392 /* When we have processed all the stabs information, we need to go
393 through and fill in all the undefined tags. */
395 boolean
397 PTR dhandle;
398 PTR handle;
399 {
404 {
410 }
413 {
422 }
425 }
427 /* Handle a single stabs symbol. */
429 boolean
431 PTR dhandle;
432 PTR handle;
435 bfd_vma value;
437 {
440 /* gcc will emit two N_SO strings per compilation unit, one for the
441 directory name and one for the file name. We just collect N_SO
442 strings as we see them, and start the new compilation unit when
443 we see a non N_SO symbol. */
446 {
454 /* Generally, for stabs in the symbol table, the N_LBRAC and
455 N_RBRAC symbols are relative to the N_SO symbol value. */
459 /* We need to reset the mapping from type numbers to types. We
460 can't free the old mapping, because of the use of
461 debug_make_indirect_type. */
469 /* Now process whatever type we just got. */
470 }
473 {
479 /* Ignore extra outermost context from SunPRO cc and acc. */
484 {
487 }
489 /* Start an inner lexical block. */
491 (value
496 /* Emit any pending variable definitions. */
504 /* Ignore extra outermost context from SunPRO cc and acc. */
508 /* We shouldn't have any pending variable definitions here, but,
509 if we do, we probably need to emit them before closing the
510 block. */
514 /* End an inner lexical block. */
516 (value
523 {
526 }
530 /* This always ends a function. */
532 {
533 bfd_vma endval;
545 }
547 /* An empty string is emitted by gcc at the end of a compilation
548 unit. */
552 /* Just accumulate strings until we see a non N_SO symbol. If
553 the string starts with a directory separator or some other
554 form of absolute path specification, we discard the previously
555 accumulated strings. */
558 else
559 {
566 else
570 }
577 /* Start an include file. */
583 /* Start an include file which may be replaced. */
590 /* End an N_BINCL include. */
596 /* This is a duplicate of a header file named by N_BINCL which
597 was eliminated by the linker. */
620 {
622 {
623 /* This always marks the end of a function; we don't
624 need to worry about info->function_end. */
632 }
634 }
636 /* A const static symbol in the .text section will have an N_FUN
637 entry. We need to use these to mark the end of the function,
638 in case we are looking at gcc output before it was changed to
639 always emit an empty N_FUN. We can't call debug_end_function
640 here, because it might be a local static symbol. */
646 /* Fall through. */
647 /* FIXME: gdb checks the string for N_STSYM, N_LCSYM or N_ROSYM
648 symbols, and if it does not start with :S, gdb relocates the
649 value to the start of the section. gcc always seems to use
650 :S, so we don't worry about this. */
651 /* Fall through. */
653 {
659 {
661 {
662 bfd_vma endval;
672 }
673 /* For stabs in sections, line numbers and block addresses
674 are offsets from the start of the function. */
678 }
682 }
690 else
699 }
702 }
704 /* Parse the stabs string. */
706 static boolean
708 PTR dhandle;
712 bfd_vma value;
714 {
718 debug_type dtype;
719 boolean synonym;
720 boolean self_crossref;
729 {
733 {
736 }
737 }
739 /* GCC 2.x puts the line number in desc. SunOS apparently puts in
740 the number of bytes occupied by a type or object, which we
741 ignore. */
744 else
747 /* FIXME: Sometimes the special C++ names start with '.'. */
750 {
752 {
757 /* Was: name = "vptr"; */
763 /* This was an anonymous type that was never fixed up. */
766 /* SunPRO (3.0 at least) static variable encoding. */
771 }
772 }
775 {
778 else
780 }
785 else
789 {
791 /* c is a special case, not followed by a type-number.
792 SYMBOL:c=iVALUE for an integer constant symbol.
793 SYMBOL:c=rVALUE for a floating constant symbol.
794 SYMBOL:c=eTYPE,INTVALUE for an enum constant symbol.
795 e.g. "b:c=e6,0" for "const b = blob1"
796 (where type 6 is defined by "blobs:t6=eblob1:0,blob2:1,;"). */
798 {
801 }
804 {
806 /* Floating point constant. */
811 /* Integer constant. */
812 /* Defining integer constants this way is kind of silly,
813 since 'e' constants allows the compiler to give not only
814 the value, but the type as well. C has at least int,
815 long, unsigned int, and long long as constant types;
816 other languages probably should have at least unsigned as
817 well as signed constants. */
822 /* SYMBOL:c=eTYPE,INTVALUE for a constant symbol whose value
823 can be represented as integral.
824 e.g. "b:c=e6,0" for "const b = blob1"
825 (where type 6 is defined by "blobs:t6=eblob1:0,blob2:1,;"). */
831 {
834 }
841 }
846 /* The name of a caught exception. */
857 /* A function definition. */
865 /* Sun acc puts declared types of arguments here. We don't care
866 about their actual types (FIXME -- we should remember the whole
867 function prototype), but the list may define some new types
868 that we have to remember, so we must scan it now. */
870 {
876 }
881 {
886 /* A global symbol. The value must be extracted from the
887 symbol table. */
894 {
902 }
906 value))
908 }
911 /* This case is faked by a conditional above, when there is no
912 code letter in the dbx data. Dbx data never actually
913 contains 'l'. */
921 value))
926 /* A function parameter. */
930 else
931 {
932 /* pF is a two-letter code that means a function parameter in
933 Fortran. The type-number specifies the type of the return
934 value. Translate it into a pointer-to-function type. */
939 {
940 debug_type ftype;
945 }
946 }
950 value))
953 /* FIXME: At this point gdb considers rearranging the parameter
954 address on a big endian machine if it is smaller than an int.
955 We have no way to do that, since we don't really know much
956 about the target. */
962 {
963 /* Prototype of a function referenced by this file. */
965 {
971 }
973 }
974 /* Fall through. */
976 /* Parameter which is in a register. */
982 value))
987 /* Register variable (either global or local). */
993 value))
996 /* FIXME: At this point gdb checks to combine pairs of 'p' and
997 'r' stabs into a single 'P' stab. */
1002 /* Static symbol at top level of file */
1008 value))
1013 /* A typedef. */
1018 {
1019 /* A nameless type. Nothing to do. */
1021 }
1033 /* Struct, union, or enum tag. For GNU C++, this can be be followed
1034 by 't' which means we are typedef'ing it as well. */
1036 {
1038 /* FIXME: gdb sets synonym to true if the current language
1039 is C++. */
1040 }
1041 else
1042 {
1045 }
1053 /* INFO->SELF_CROSSREF is set by parse_stab_type if this type is
1054 a cross reference to itself. These are generated by some
1055 versions of g++. */
1064 /* See if we have a cross reference to this tag which we can now
1065 fill in. Avoid filling in a cross reference to ourselves,
1066 because that would lead to circular debugging information. */
1068 {
1072 {
1075 {
1079 }
1080 }
1081 }
1084 {
1091 }
1096 /* Static symbol of local scope */
1101 /* FIXME: gdb checks os9k_stabs here. */
1108 /* Reference parameter. */
1114 value))
1119 /* Reference parameter which is in a register. */
1125 value))
1130 /* This is used by Sun FORTRAN for "function result value".
1131 Sun claims ("dbx and dbxtool interfaces", 2nd ed)
1132 that Pascal uses it too, but when I tried it Pascal used
1133 "x:3" (local symbol) instead. */
1139 value))
1146 }
1148 /* FIXME: gdb converts structure values to structure pointers in a
1149 couple of cases, depending upon the target. */
1152 }
1154 /* Parse a stabs type. The typename argument is non-NULL if this is a
1155 typedef or a tag definition. The pp argument points to the stab
1156 string, and is updated. The slotp argument points to a place to
1157 store the slot used if the type is being defined. */
1159 static debug_type
1161 PTR dhandle;
1166 {
1170 boolean stringp;
1172 debug_type dtype;
1184 /* Read type number if present. The type number may be omitted.
1185 for instance in a two-dimensional array declared with type
1186 "ar1;1;10;ar1;1;10;4". */
1188 {
1189 /* 'typenums=' not present, type is anonymous. Read and return
1190 the definition, but don't put it in the type vector. */
1192 }
1193 else
1194 {
1199 {
1200 /* Type is not being defined here. Either it already
1201 exists, or this is a forward reference to it. */
1203 }
1205 /* Only set the slot if the type is being defined. This means
1206 that the mapping from type numbers to types will only record
1207 the name of the typedef which defines a type. If we don't do
1208 this, then something like
1209 typedef int foo;
1210 int i;
1211 will record that i is of type foo. Unfortunately, stabs
1212 information is ambiguous about variable types. For this code,
1213 typedef int foo;
1214 int i;
1215 foo j;
1216 the stabs information records both i and j as having the same
1217 type. This could be fixed by patching the compiler. */
1221 /* Type is being defined here. */
1222 /* Skip the '='. */
1226 {
1231 {
1232 /* Member type. */
1234 }
1236 /* Type attributes. */
1240 {
1242 {
1245 }
1246 }
1250 {
1263 /* Ignore unrecognized type attributes, so future
1264 compilers can invent new ones. */
1266 }
1267 }
1268 }
1274 {
1276 {
1280 /* A cross reference to another type. */
1283 {
1294 /* Complain and keep going, so compilers can invent new
1295 cross-reference types. */
1299 }
1305 {
1308 }
1310 {
1314 {
1321 }
1324 {
1327 }
1328 }
1330 /* Some versions of g++ can emit stabs like
1331 fleep:T20=xsfleep:
1332 which define structures in terms of themselves. We need to
1333 tell the caller to avoid building a circular structure. */
1342 }
1357 {
1361 /* This type is defined as another type. */
1366 /* Peek ahead at the number to detect void. */
1371 {
1372 /* This type is being defined as itself, which means that
1373 it is void. */
1375 }
1376 else
1377 {
1380 /* Go back to the number and have parse_stab_type get it.
1381 This means that we can deal with something like
1382 t(1,2)=(3,4)=... which the Lucid compiler uses. */
1387 }
1390 {
1393 }
1396 }
1402 pp,
1407 /* Reference to another type. */
1408 dtype = (debug_make_reference_type
1415 /* Function returning another type. */
1416 /* FIXME: gdb checks os9k_stabs here. */
1417 dtype = (debug_make_function_type
1425 /* Const qualifier on some type (Sun). */
1426 /* FIXME: gdb accepts 'c' here if os9k_stabs. */
1430 pp,
1435 /* Volatile qual on some type (Sun). */
1436 /* FIXME: gdb accepts 'i' here if os9k_stabs. */
1437 dtype = (debug_make_volatile_type
1444 /* Offset (class & variable) type. This is used for a pointer
1445 relative to an object. */
1446 {
1447 debug_type domain;
1448 debug_type memtype;
1450 /* Member type. */
1458 {
1461 }
1470 }
1474 /* Method (class & fn) type. */
1476 {
1477 debug_type return_type;
1485 {
1488 }
1491 DEBUG_TYPE_NULL,
1493 }
1494 else
1495 {
1496 debug_type domain;
1497 debug_type return_type;
1501 boolean varargs;
1509 {
1512 }
1524 {
1526 {
1529 }
1533 {
1537 }
1544 }
1547 /* If the last type is not void, then this function takes a
1548 variable number of arguments. Otherwise, we must strip
1549 the void type. */
1553 else
1554 {
1557 }
1562 varargs);
1563 }
1567 /* Range type. */
1572 /* FIXME: gdb checks os9k_stabs here. */
1573 /* Sun ACC builtin int type. */
1578 /* Sun ACC builtin float type. */
1583 /* Enumeration type. */
1589 /* Struct or union type. */
1595 /* Array type. */
1597 {
1600 }
1610 pp,
1612 stringp);
1618 }
1624 {
1627 }
1630 {
1633 }
1636 }
1638 /* Read a number by which a type is referred to in dbx data, or
1639 perhaps read a pair (FILENUM, TYPENUM) in parentheses. Just a
1640 single number N is equivalent to (0,N). Return the two numbers by
1641 storing them in the vector TYPENUMS. */
1643 static boolean
1647 {
1653 {
1656 }
1657 else
1658 {
1662 {
1665 }
1669 {
1672 }
1674 }
1677 }
1679 /* Parse a range type. */
1681 static debug_type
1683 PTR dhandle;
1688 {
1691 boolean self_subrange;
1692 debug_type index_type;
1701 /* First comes a type we are a subrange of.
1702 In C it is usually 0, 1 or the type being defined. */
1710 {
1716 }
1721 /* The remaining two operands are usually lower and upper bounds of
1722 the range. But in some special cases they mean something else. */
1726 {
1729 }
1735 {
1738 }
1742 {
1743 /* gcc will emit range stabs for long long types. Handle this
1744 as a special case. FIXME: This needs to be more general. */
1749 {
1757 }
1760 }
1763 {
1764 /* A type defined as a subrange of itself, with both bounds 0,
1765 is void. */
1769 /* A type defined as a subrange of itself, with n2 positive and
1770 n3 zero, is a complex type, and n2 is the number of bytes. */
1774 /* If n3 is zero and n2 is positive, this is a floating point
1775 type, and n2 is the number of bytes. */
1779 /* If the upper bound is -1, this is an unsigned int. */
1781 {
1782 /* When gcc is used with -gstabs, but not -gstabs+, it will emit
1783 long long int:t6=r1;0;-1;
1784 long long unsigned int:t7=r1;0;-1;
1785 We hack here to handle this reasonably. */
1787 {
1792 }
1793 /* FIXME: The size here really depends upon the target. */
1795 }
1797 /* A range of 0 to 127 is char. */
1801 /* FIXME: gdb checks for the language CHILL here. */
1804 {
1813 #ifdef BFD64
1816 #endif
1817 }
1823 {
1830 #ifdef BFD64
1833 #endif
1834 }
1835 }
1837 /* At this point I don't have the faintest idea how to deal with a
1838 self_subrange type; I'm going to assume that this is used as an
1839 idiom, and that all of them are special cases. So . . . */
1841 {
1844 }
1848 {
1849 /* Does this actually ever happen? Is that why we are worrying
1850 about dealing with it rather than just calling error_type? */
1853 }
1856 }
1858 /* Sun's ACC uses a somewhat saner method for specifying the builtin
1859 typedefs in every file (for int, long, etc):
1861 type = b <signed> <width>; <offset>; <nbits>
1862 signed = u or s. Possible c in addition to u or s (for char?).
1863 offset = offset from high order bit to start bit of type.
1864 width is # bytes in object of this type, nbits is # bits in type.
1866 The width/offset stuff appears to be for small objects stored in
1867 larger ones (e.g. `shorts' in `int' registers). We ignore it for now,
1868 FIXME. */
1870 static debug_type
1872 PTR dhandle;
1874 {
1876 boolean unsignedp;
1877 bfd_vma bits;
1882 {
1892 }
1895 /* For some odd reason, all forms of char put a c here. This is strange
1896 because no other type has this honor. We can safely ignore this because
1897 we actually determine 'char'acterness by the number of bits specified in
1898 the descriptor. */
1902 /* The first number appears to be the number of bytes occupied
1903 by this type, except that unsigned short is 4 instead of 2.
1904 Since this information is redundant with the third number,
1905 we will ignore it. */
1908 {
1911 }
1914 /* The second number is always 0, so ignore it too. */
1917 {
1920 }
1923 /* The third number is the number of bits for this type. */
1926 /* The type *should* end with a semicolon. If it are embedded
1927 in a larger type the semicolon may be the only way to know where
1928 the type ends. If this type is at the end of the stabstring we
1929 can deal with the omitted semicolon (but we don't have to like
1930 it). Don't bother to complain(), Sun's compiler omits the semicolon
1931 for "void". */
1939 }
1941 /* Parse a builtin floating type generated by the Sun compiler. */
1943 static debug_type
1945 PTR dhandle;
1947 {
1949 bfd_vma details;
1950 bfd_vma bytes;
1954 /* The first number has more details about the type, for example
1955 FN_COMPLEX. */
1958 {
1961 }
1963 /* The second number is the number of bytes occupied by this type */
1966 {
1969 }
1977 }
1979 /* Handle an enum type. */
1981 static debug_type
1983 PTR dhandle;
1985 {
1994 /* FIXME: gdb checks os9k_stabs here. */
1996 /* The aix4 compiler emits an extra field before the enum members;
1997 my guess is it's a type of some sort. Just ignore it. */
1999 {
2003 }
2005 /* Read the value-names and their values.
2006 The input syntax is NAME:VALUE,NAME:VALUE, and so on.
2007 A semicolon or comma instead of a NAME means the end. */
2013 {
2016 bfd_signed_vma val;
2027 {
2030 }
2034 {
2040 }
2045 }
2054 }
2056 /* Read the description of a structure (or union type) and return an object
2057 describing the type.
2059 PP points to a character pointer that points to the next unconsumed token
2060 in the the stabs string. For example, given stabs "A:T4=s4a:1,0,32;;",
2061 *PP will point to "4a:1,0,32;;". */
2063 static debug_type
2065 PTR dhandle;
2069 boolean structp;
2071 {
2073 bfd_vma size;
2076 boolean statics;
2078 debug_type vptrbase;
2079 boolean ownvptr;
2083 /* Get the size. */
2086 /* Get the other information. */
2103 }
2105 /* The stabs for C++ derived classes contain baseclass information which
2106 is marked by a '!' character after the total size. This function is
2107 called when we encounter the baseclass marker, and slurps up all the
2108 baseclass information.
2110 Immediately following the '!' marker is the number of base classes that
2111 the class is derived from, followed by information for each base class.
2112 For each base class, there are two visibility specifiers, a bit offset
2113 to the base class information within the derived class, a reference to
2114 the type for the base class, and a terminating semicolon.
2116 A typical example, with two base classes, would be "!2,020,19;0264,21;".
2117 ^^ ^ ^ ^ ^ ^ ^
2118 Baseclass information marker __________________|| | | | | | |
2119 Number of baseclasses __________________________| | | | | | |
2120 Visibility specifiers (2) ________________________| | | | | |
2121 Offset in bits from start of class _________________| | | | |
2122 Type number for base class ___________________________| | | |
2123 Visibility specifiers (2) _______________________________| | |
2124 Offset in bits from start of class ________________________| |
2125 Type number of base class ____________________________________|
2127 Return true for success, false for failure. */
2129 static boolean
2131 PTR dhandle;
2135 {
2145 {
2146 /* No base classes. */
2148 }
2154 {
2157 }
2163 {
2166 bfd_vma bitpos;
2167 debug_type type;
2170 {
2181 }
2185 {
2199 }
2202 /* The remaining value is the bit offset of the portion of the
2203 object corresponding to this baseclass. Always zero in the
2204 absence of multiple inheritance. */
2207 {
2210 }
2219 visibility);
2226 }
2233 }
2235 /* Read struct or class data fields. They have the form:
2237 NAME : [VISIBILITY] TYPENUM , BITPOS , BITSIZE ;
2239 At the end, we see a semicolon instead of a field.
2241 In C++, this may wind up being NAME:?TYPENUM:PHYSNAME; for
2242 a static field.
2244 The optional VISIBILITY is one of:
2246 '/0' (VISIBILITY_PRIVATE)
2247 '/1' (VISIBILITY_PROTECTED)
2248 '/2' (VISIBILITY_PUBLIC)
2249 '/9' (VISIBILITY_IGNORE)
2251 or nothing, for C style fields with public visibility.
2253 Returns 1 for success, 0 for failure. */
2255 static boolean
2257 PTR dhandle;
2262 {
2278 {
2279 /* FIXME: gdb checks os9k_stabs here. */
2283 /* Add 1 to c to leave room for NULL pointer at end. */
2285 {
2289 }
2291 /* If it starts with CPLUS_MARKER it is a special abbreviation,
2292 unless the CPLUS_MARKER is followed by an underscore, in
2293 which case it is just the name of an anonymous type, which we
2294 should handle like any other type name. We accept either '$'
2295 or '.', because a field name can never contain one of these
2296 characters except as a CPLUS_MARKER. */
2299 {
2305 }
2307 /* Look for the ':' that separates the field name from the field
2308 values. Data members are delimited by a single ':', while member
2309 functions are delimited by a pair of ':'s. When we hit the member
2310 functions (if any), terminate scan loop and return. */
2314 {
2317 }
2323 staticsp))
2327 }
2334 }
2336 /* Special GNU C++ name. */
2338 static boolean
2340 PTR dhandle;
2344 {
2347 debug_type context;
2350 debug_type type;
2351 bfd_vma bitpos;
2358 {
2361 }
2367 /* At this point, *pp points to something like "22:23=*22...", where
2368 the type number before the ':' is the "context" and everything
2369 after is a regular type definition. Lookup the type, find it's
2370 name, and construct the field name. */
2378 {
2380 /* $vf -- a virtual function table pointer. */
2384 /* $vb -- a virtual bsomethingorother */
2387 {
2390 }
2397 }
2400 {
2403 }
2409 {
2412 }
2417 {
2420 }
2424 DEBUG_VISIBILITY_PRIVATE);
2429 }
2431 /* Parse a single field in a struct or union. */
2433 static boolean
2435 PTR dhandle;
2441 {
2445 debug_type type;
2446 bfd_vma bitpos;
2447 bfd_vma bitsize;
2451 /* FIXME: gdb checks ARM_DEMANGLING here. */
2459 else
2460 {
2463 {
2477 }
2479 }
2487 {
2490 /* This is a static class member. */
2494 {
2497 }
2504 visibility);
2508 }
2511 {
2514 }
2519 {
2522 }
2527 {
2530 }
2534 {
2535 /* This can happen in two cases: (1) at least for gcc 2.4.5 or
2536 so, it is a field which has been optimized out. The correct
2537 stab for this case is to use VISIBILITY_IGNORE, but that is a
2538 recent invention. (2) It is a 0-size array. For example
2539 union { int num; char str[0]; } foo. Printing "<no value>"
2540 for str in "p foo" is OK, since foo.str (and thus foo.str[3])
2541 will continue to work, and a 0-size array as a whole doesn't
2542 have any contents to print.
2544 I suspect this probably could also happen with gcc -gstabs
2545 (not -gstabs+) for static fields, and perhaps other C++
2546 extensions. Hopefully few people use -gstabs with gdb, since
2547 it is intended for dbx compatibility. */
2549 }
2551 /* FIXME: gdb does some stuff here to mark fields as unpacked. */
2556 }
2558 /* Read member function stabs info for C++ classes. The form of each member
2559 function data is:
2561 NAME :: TYPENUM[=type definition] ARGS : PHYSNAME ;
2563 An example with two member functions is:
2565 afunc1::20=##15;:i;2A.;afunc2::20:i;2A.;
2567 For the case of overloaded operators, the format is op$::*.funcs, where
2568 $ is the CPLUS_MARKER (usually '$'), `*' holds the place for an operator
2569 name (such as `+=') and `.' marks the end of the operator name. */
2571 static boolean
2573 PTR dhandle;
2579 {
2594 {
2600 debug_type look_ahead_type;
2606 /* FIXME: Some systems use something other than '$' here. */
2608 {
2611 }
2612 else
2613 {
2614 /* This is a completely wierd case. In order to stuff in the
2615 names that might contain colons (the usual name delimiter),
2616 Mike Tiemann defined a different name format which is
2617 signalled if the identifier is "op$". In that case, the
2618 format is "op$::XXXX." where XXXX is the name. This is
2619 used for names like "+" or "=". YUUUUUUUK! FIXME! */
2622 ;
2624 {
2627 }
2630 }
2639 do
2640 {
2641 debug_type type;
2642 boolean stub;
2646 bfd_vma voffset;
2647 debug_type context;
2649 boolean varargs;
2652 {
2653 /* g++ version 1 kludge */
2656 }
2657 else
2658 {
2664 {
2667 }
2668 }
2673 {
2676 }
2687 {
2697 }
2703 {
2705 /* Normal function. */
2709 /* const member function. */
2714 /* volatile member function. */
2719 /* const volatile member function. */
2727 /* File compiled with g++ version 1; no information. */
2732 }
2736 {
2738 /* virtual member function, followed by index. The sign
2739 bit is supposedly set to distinguish
2740 pointers-to-methods from virtual function indicies. */
2744 {
2747 }
2752 {
2753 /* Must be g++ version 1. */
2755 }
2756 else
2757 {
2758 /* Figure out from whence this virtual function
2759 came. It may belong to virtual function table of
2760 one of its baseclasses. */
2763 pp,
2766 {
2767 /* g++ version 1 overloaded methods. */
2769 }
2770 else
2771 {
2775 {
2778 }
2780 }
2781 }
2785 /* static member function. */
2805 }
2807 /* If the type is not a stub, then the argtypes string is
2808 the physical name of the function. Otherwise the
2809 argtypes string is the mangled form of the argument
2810 types, and the full type and the physical name must be
2811 extracted from them. */
2814 else
2815 {
2823 {
2826 }
2832 }
2835 {
2840 }
2847 else
2849 physname,
2850 type,
2851 visibility,
2852 constp,
2853 volatilep);
2858 }
2867 {
2871 }
2876 }
2884 }
2886 /* Parse a string representing argument types for a method. Stabs
2887 tries to save space by packing argument types into a mangled
2888 string. This string should give us enough information to extract
2889 both argument types and the physical name of the function, given
2890 the tag name. */
2892 static debug_type
2895 PTR dhandle;
2897 debug_type class_type;
2900 debug_type return_type;
2902 boolean constp;
2903 boolean volatilep;
2905 {
2906 boolean is_full_physname_constructor;
2907 boolean is_constructor;
2908 boolean is_destructor;
2910 boolean varargs;
2913 /* Constructors are sometimes handled specially. */
2921 is_constructor = (is_full_physname_constructor
2931 else
2932 {
2947 {
2948 /* Template methods are fully mangled. */
2952 }
2953 else
2958 + len
2965 {
2970 {
2973 }
2978 }
2979 else
2980 {
2984 else
2986 }
2995 }
2998 {
3003 }
3010 varargs);
3011 }
3013 /* The tail end of stabs for C++ classes that contain a virtual function
3014 pointer contains a tilde, a %, and a type number.
3015 The type number refers to the base class (possibly this class itself) which
3016 contains the vtable pointer for the current class.
3018 This function is called when we have parsed all the method declarations,
3019 so we can look for the vptr base class info. */
3021 static boolean
3023 PTR dhandle;
3029 {
3039 /* If we are positioned at a ';', then skip it. */
3049 {
3050 /* Obsolete flags that used to indicate the presence of
3051 constructors and/or destructors. */
3053 }
3062 /* The next number is the type number of the base class (possibly
3063 our own class) which supplies the vtable for this class. */
3070 else
3071 {
3072 debug_type vtype;
3080 ;
3082 {
3085 }
3090 }
3093 }
3095 /* Read a definition of an array type. */
3097 static debug_type
3099 PTR dhandle;
3102 boolean stringp;
3103 {
3107 debug_type index_type;
3108 boolean adjustable;
3110 debug_type element_type;
3112 /* Format of an array type:
3113 "ar<index type>;lower;upper;<array_contents_type>".
3114 OS9000: "arlower,upper;<array_contents_type>".
3116 Fortran adjustable arrays use Adigits or Tdigits for lower or upper;
3117 for these, produce a type like float[][]. */
3121 /* FIXME: gdb checks os9k_stabs here. */
3123 /* If the index type is type 0, we take it as int. */
3128 {
3131 {
3135 }
3137 }
3138 else
3139 {
3142 }
3145 {
3148 }
3154 {
3157 }
3161 {
3164 }
3168 {
3171 }
3175 {
3178 }
3187 {
3190 }
3194 }
3196 /* This struct holds information about files we have seen using
3197 N_BINCL. */
3199 struct bincl_file
3200 {
3201 /* The next N_BINCL file. */
3203 /* The next N_BINCL on the stack. */
3205 /* The file name. */
3207 /* The hash value. */
3208 bfd_vma hash;
3209 /* The file index. */
3211 /* The list of types defined in this file. */
3213 };
3215 /* Start a new N_BINCL file, pushing it onto the stack. */
3217 static void
3221 bfd_vma hash;
3222 {
3241 }
3243 /* Finish an N_BINCL file, at an N_EINCL, popping the name off the
3244 stack. */
3249 {
3262 }
3264 /* Handle an N_EXCL: get the types from the corresponding N_BINCL. */
3266 static boolean
3270 bfd_vma hash;
3271 {
3284 {
3288 }
3293 }
3295 /* Handle a variable definition. gcc emits variable definitions for a
3296 block before the N_LBRAC, so we must hold onto them until we see
3297 it. The SunPRO compiler emits variable definitions after the
3298 N_LBRAC, so we can call debug_record_variable immediately. */
3300 static boolean
3302 PTR dhandle;
3305 debug_type type;
3307 bfd_vma val;
3308 {
3327 }
3329 /* Emit pending variable definitions. This is called after we see the
3330 N_LBRAC that starts the block. */
3332 static boolean
3334 PTR dhandle;
3336 {
3341 {
3350 }
3355 }
3357 /* Find the slot for a type in the database. */
3363 {
3372 {
3375 }
3377 {
3380 }
3385 {
3387 {
3390 }
3393 }
3395 {
3398 }
3401 }
3403 /* Find a type given a type number. If the type has not been
3404 allocated yet, create an indirect type. */
3406 static debug_type
3408 PTR dhandle;
3411 {
3415 {
3416 /* A negative type number indicates an XCOFF builtin type. */
3418 }
3428 }
3430 /* Record that a given type number refers to a given type. */
3432 static boolean
3434 PTR dhandle ATTRIBUTE_UNUSED;
3437 debug_type type;
3438 {
3445 /* gdb appears to ignore type redefinitions, so we do as well. */
3450 }
3452 /* Return an XCOFF builtin type. */
3454 static debug_type
3456 PTR dhandle;
3459 {
3460 debug_type rettype;
3464 {
3467 }
3472 {
3474 /* The size of this and all the other types are fixed, defined
3475 by the debugging format. */
3519 /* IEEE single precision (32 bit). */
3524 /* IEEE double precision (64 bit). */
3529 /* This is an IEEE double on the RS/6000, and different machines
3530 with different sizes for "long double" should use different
3531 negative type numbers. See stabs.texinfo. */
3552 /* FIXME */
3557 /* FIXME */
3578 /* Complex type consisting of two IEEE single precision values. */
3583 /* Complex type consisting of two IEEE double precision values. */
3600 /* FIXME */
3622 }
3629 }
3631 /* Find or create a tagged type. */
3633 static debug_type
3635 PTR dhandle;
3640 {
3642 debug_type dtype;
3647 /* We pass DEBUG_KIND_ILLEGAL because we want all tags in the same
3648 namespace. This is right for C, and I don't know how to handle
3649 other languages. FIXME. */
3652 {
3655 }
3657 /* We need to allocate an entry on the undefined tag list. */
3659 {
3662 {
3667 }
3668 }
3670 {
3680 }
3683 }
3684 \f
3685 /* In order to get the correct argument types for a stubbed method, we
3686 need to extract the argument types from a C++ mangled string.
3687 Since the argument types can refer back to the return type, this
3688 means that we must demangle the entire physical name. In gdb this
3689 is done by calling cplus_demangle and running the results back
3690 through the C++ expression parser. Since we have no expression
3691 parser, we must duplicate much of the work of cplus_demangle here.
3693 We assume that GNU style demangling is used, since this is only
3694 done for method stubs, and only g++ should output that form of
3695 debugging information. */
3697 /* This structure is used to hold a pointer to type information which
3698 demangling a string. */
3700 struct stab_demangle_typestring
3701 {
3702 /* The start of the type. This is not null terminated. */
3704 /* The length of the type. */
3706 };
3708 /* This structure is used to hold information while demangling a
3709 string. */
3711 struct stab_demangle_info
3712 {
3713 /* The debugging information handle. */
3714 PTR dhandle;
3715 /* The stab information handle. */
3717 /* The array of arguments we are building. */
3719 /* Whether the method takes a variable number of arguments. */
3720 boolean varargs;
3721 /* The array of types we have remembered. */
3723 /* The number of typestrings. */
3725 /* The number of typestring slots we have allocated. */
3727 };
3731 static boolean stab_demangle_get_count
3733 static boolean stab_demangle_prefix
3735 static boolean stab_demangle_function_name
3737 static boolean stab_demangle_signature
3739 static boolean stab_demangle_qualified
3741 static boolean stab_demangle_template
3743 static boolean stab_demangle_class
3745 static boolean stab_demangle_args
3747 boolean *));
3748 static boolean stab_demangle_arg
3751 static boolean stab_demangle_type
3753 static boolean stab_demangle_fund_type
3755 static boolean stab_demangle_remember_type
3758 /* Warn about a bad demangling. */
3760 static void
3763 {
3765 }
3767 /* Get a count from a stab string. */
3769 static unsigned int
3772 {
3777 {
3781 }
3783 }
3785 /* Require a count in a string. The count may be multiple digits, in
3786 which case it must end in an underscore. */
3788 static boolean
3792 {
3799 {
3805 do
3806 {
3810 }
3813 {
3816 }
3817 }
3820 }
3822 /* This function demangles a physical name, returning a NULL
3823 terminated array of argument types. */
3827 PTR dhandle;
3832 {
3845 /* cplus_demangle checks for special GNU mangled forms, but we can't
3846 see any of them in mangled method argument types. */
3852 {
3855 }
3866 error_return:
3870 }
3872 /* Demangle the prefix of the mangled name. */
3874 static boolean
3879 {
3883 /* cplus_demangle checks for global constructors and destructors,
3884 but we can't see them in mangled argument types. */
3888 else
3889 {
3890 /* Look for `__'. */
3892 do
3897 {
3900 }
3904 /* We found `__'; move ahead to the last contiguous `__' pair. */
3908 }
3914 {
3915 /* This is a GNU style constructor name. */
3918 }
3922 {
3923 /* Look for the `__' that separates the prefix from the
3924 signature. */
3929 {
3932 }
3935 }
3937 {
3938 /* The name doesn't start with `__', but it does contain `__'. */
3940 }
3941 else
3942 {
3945 }
3946 /*NOTREACHED*/
3947 }
3949 /* Demangle a function name prefix. The scan argument points to the
3950 double underscore which separates the function name from the
3951 signature. */
3953 static boolean
3958 {
3961 /* The string from *pp to scan is the name of the function. We
3962 don't care about the name, since we just looking for argument
3963 types. However, for conversion operators, the name may include a
3964 type which we must remember in order to handle backreferences. */
3972 {
3975 /* This is a type conversion operator. */
3979 }
3984 {
3987 /* This is a type conversion operator. */
3991 }
3994 }
3996 /* Demangle the signature. This is where the argument types are
3997 found. */
3999 static boolean
4003 {
4015 {
4017 {
4028 /* Static member function. FIXME: Can this happen? */
4035 /* Const member function. */
4053 /* Function. I don't know if this actually happens with g++
4054 output. */
4063 /* Template. */
4074 /* At the outermost level, we cannot have a return type
4075 specified, so if we run into another '_' at this point we
4076 are dealing with a mangled name that is either bogus, or
4077 has been mangled by some algorithm we don't know how to
4078 deal with. So just reject the entire demangling. */
4083 /* Assume we have stumbled onto the first outermost function
4084 argument token, and start processing args. */
4089 }
4092 {
4096 }
4097 }
4100 {
4101 /* With GNU style demangling, bar__3foo is 'foo::bar(void)', and
4102 bar__3fooi is 'foo::bar(int)'. We get here when we find the
4103 first case, and need to ensure that the '(void)' gets added
4104 to the current declp. */
4107 }
4110 }
4112 /* Demangle a qualified name, such as "Q25Outer5Inner" which is the
4113 mangled form of "Outer::Inner". */
4115 static boolean
4120 {
4124 debug_type context;
4129 {
4131 /* GNU mangled name with more than 9 classes. The count is
4132 preceded by an underscore (to distinguish it from the <= 9
4133 case) and followed by an underscore. */
4136 {
4139 }
4144 {
4147 }
4154 /* Skip an optional underscore after the count. */
4164 }
4168 /* Pick off the names. */
4170 {
4174 {
4182 {
4185 DEBUG_KIND_CLASS);
4189 }
4190 }
4191 else
4192 {
4197 {
4200 }
4203 {
4213 {
4216 /* Try to find the type by looking through the
4217 fields of context until we find a field with the
4218 same type. This ought to work for a class
4219 defined within a class, but it won't work for,
4220 e.g., an enum defined within a class. stabs does
4221 not give us enough information to figure out the
4222 latter case. */
4227 {
4228 debug_type ft;
4236 {
4239 }
4240 }
4243 }
4246 {
4247 /* We have to fall back on finding the type by name.
4248 If there are more types to come, then this must
4249 be a class. Otherwise, it could be anything. */
4252 {
4257 name);
4259 }
4262 {
4267 ? DEBUG_KIND_ILLEGAL
4271 }
4272 }
4273 }
4276 }
4277 }
4283 }
4285 /* Demangle a template. If PNAME is not NULL, this sets *PNAME to a
4286 string representation of the template. */
4288 static boolean
4293 {
4301 /* Skip the template name. */
4304 {
4307 }
4310 /* Get the size of the parameter list. */
4312 {
4315 }
4318 {
4320 {
4321 /* This is a type parameter. */
4325 }
4326 else
4327 {
4330 boolean done;
4340 /* This is a value parameter. */
4346 {
4348 {
4395 /* Assume it's a user defined integral type. */
4399 }
4400 }
4403 {
4408 }
4410 {
4417 {
4420 }
4421 }
4423 {
4428 {
4431 }
4432 }
4434 {
4440 {
4444 }
4446 {
4450 }
4451 }
4453 {
4457 {
4460 }
4462 }
4463 }
4464 }
4466 /* We can translate this to a string fairly easily by invoking the
4467 regular demangling routine. */
4469 {
4486 {
4491 }
4493 /* Eliminating all spaces, except those between > characters,
4494 makes it more likely that the demangled name will match the
4495 name which g++ used as the structure name. */
4504 }
4507 }
4509 /* Demangle a class name. */
4511 static boolean
4516 {
4524 {
4527 }
4535 }
4537 /* Demangle function arguments. If the pargs argument is not NULL, it
4538 is set to a NULL terminated array holding the arguments. */
4540 static boolean
4546 {
4554 {
4557 }
4561 {
4563 {
4572 else
4573 {
4575 {
4578 }
4579 }
4582 {
4585 }
4588 {
4591 }
4593 {
4599 }
4600 }
4601 else
4602 {
4605 }
4606 }
4612 {
4616 }
4619 }
4621 /* Demangle a single argument. */
4623 static boolean
4630 {
4632 debug_type type;
4641 {
4646 {
4650 }
4653 }
4656 }
4658 /* Demangle a type. If the ptype argument is not NULL, *ptype is set
4659 to the newly allocated type. */
4661 static boolean
4666 {
4672 {
4675 /* A pointer type. */
4684 /* A reference type. */
4693 /* An array. */
4694 {
4700 {
4702 {
4705 }
4709 }
4711 {
4714 }
4720 {
4721 debug_type int_type;
4728 }
4729 }
4733 /* A back reference to a remembered type. */
4734 {
4740 {
4743 }
4745 {
4748 }
4752 }
4756 /* A function. */
4757 {
4759 boolean varargs;
4771 {
4772 /* cplus_demangle will accept a function without a return
4773 type, but I don't know when that will happen, or what
4774 to do if it does. */
4777 }
4783 varargs);
4785 }
4790 {
4794 boolean varargs;
4806 {
4809 {
4812 }
4817 {
4821 DEBUG_KIND_CLASS);
4824 }
4825 }
4827 {
4833 }
4834 else
4835 {
4838 }
4841 {
4843 {
4846 }
4848 {
4851 }
4853 {
4856 }
4866 }
4869 {
4872 }
4879 {
4883 else
4884 {
4885 /* FIXME: We have no way to record constp or
4886 volatilep. */
4889 }
4890 }
4891 }
4909 {
4915 }
4922 }
4925 }
4927 /* Demangle a fundamental type. If the ptype argument is not NULL,
4928 *ptype is set to the newly allocated type. */
4930 static boolean
4935 {
4938 boolean done;
4949 {
4951 {
4975 }
4976 }
4979 {
4982 /* cplus_demangle permits this, but I don't know what it means. */
4988 {
4992 }
4998 {
5000 (unsignedp
5005 }
5011 {
5013 (unsignedp
5018 }
5024 {
5026 (unsignedp
5031 }
5037 {
5039 (unsignedp
5044 }
5050 {
5054 }
5060 {
5062 (unsignedp
5064 : (signedp
5069 }
5075 {
5079 }
5085 {
5089 }
5095 {
5099 }
5105 {
5109 }
5116 {
5119 }
5120 /* Fall through. */
5123 {
5129 {
5136 {
5137 /* FIXME: It is probably incorrect to assume that
5138 undefined types are tagged types. */
5141 DEBUG_KIND_ILLEGAL);
5144 }
5145 }
5146 }
5150 {
5157 {
5160 DEBUG_KIND_CLASS);
5164 }
5165 }
5171 }
5174 {
5179 }
5182 }
5184 /* Remember a type string in a demangled string. */
5186 static boolean
5191 {
5193 {
5199 }
5206 }