From John Reiser <jreiser@BitWagon.com>
[external/binutils.git] / ld / ldlex.l
1 %{
2
3 /* Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
4    Free Software Foundation, Inc.
5
6 This file is part of GLD, the Gnu Linker.
7
8 GLD 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, or (at your option)
11 any later version.
12
13 GLD 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.
17
18 You should have received a copy of the GNU General Public License
19 along with GLD; see the file COPYING.  If not, write to the Free
20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
21 02111-1307, USA.  */
22
23 /*
24 This was written by steve chamberlain
25                     sac@cygnus.com
26 */
27
28
29 #include <ansidecl.h>
30 #include <stdio.h>
31
32 #ifdef MPW
33 /* Prevent enum redefinition problems. */
34 #define TRUE_FALSE_ALREADY_DEFINED
35 #endif /* MPW */
36
37 #include "bfd.h"
38 #include "sysdep.h"
39 #include "safe-ctype.h"
40 #include "ld.h"
41 #include "ldgram.h"
42 #include "ldmisc.h"
43 #include "ldexp.h"
44 #include "ldlang.h"
45 #include "ldfile.h"
46 #include "ldlex.h"
47 #include "ldmain.h"
48 #include "libiberty.h"
49
50 /* The type of top-level parser input.
51    yylex and yyparse (indirectly) both check this.  */
52 input_type parser_input;
53
54 /* Line number in the current input file.
55    (FIXME Actually, it doesn't appear to get reset for each file?)  */
56 unsigned int lineno = 1;
57
58 /* The string we are currently lexing, or NULL if we are reading a
59    file.  */
60 const char *lex_string = NULL;
61
62 /* Support for flex reading from more than one input file (stream).
63    `include_stack' is flex's input state for each open file;
64    `file_name_stack' is the file names.  `lineno_stack' is the current
65    line numbers.
66
67    If `include_stack_ptr' is 0, we haven't started reading anything yet.
68    Otherwise, stack elements 0 through `include_stack_ptr - 1' are valid.  */
69
70 #undef YY_INPUT
71 #define YY_INPUT(buf,result,max_size) yy_input(buf, &result, max_size)
72
73 #define MAX_INCLUDE_DEPTH 10
74 static YY_BUFFER_STATE include_stack[MAX_INCLUDE_DEPTH];
75 static const char *file_name_stack[MAX_INCLUDE_DEPTH];
76 static unsigned int lineno_stack[MAX_INCLUDE_DEPTH];
77 static unsigned int include_stack_ptr = 0;
78 static int vers_node_nesting = 0;
79
80 static YY_BUFFER_STATE yy_create_string_buffer PARAMS ((const char *string,
81                                                         size_t size));
82 static void yy_input PARAMS ((char *, int *result, int max_size));
83
84 static void comment PARAMS ((void));
85 static void lex_warn_invalid PARAMS ((char *where, char *what));
86
87 /* STATES 
88         EXPRESSION      definitely in an expression
89         SCRIPT          definitely in a script
90         BOTH            either EXPRESSION or SCRIPT
91         DEFSYMEXP       in an argument to -defsym
92         MRI             in an MRI script
93         VERS_START      starting a Sun style mapfile
94         VERS_SCRIPT     a Sun style mapfile
95         VERS_NODE       a node within a Sun style mapfile
96 */
97 #define RTOKEN(x)  {  yylval.token = x; return x; }
98
99 /* Some versions of flex want this.  */
100 #ifndef yywrap
101 int yywrap () { return 1; }
102 #endif
103 %}
104
105 %a 4000
106 %o 5000
107
108 CMDFILENAMECHAR   [_a-zA-Z0-9\/\.\\_\+\$\:\[\]\\\,\=\&\!\<\>\-\~]
109 CMDFILENAMECHAR1  [_a-zA-Z0-9\/\.\\_\+\$\:\[\]\\\,\=\&\!\<\>\~]
110 FILENAMECHAR1   [_a-zA-Z\/\.\\\$\_\~]
111 SYMBOLCHARN     [_a-zA-Z\/\.\\\$\_\~0-9]
112 FILENAMECHAR    [_a-zA-Z0-9\/\.\-\_\+\=\$\:\[\]\\\,\~]
113 WILDCHAR        [_a-zA-Z0-9\/\.\-\_\+\=\$\:\[\]\\\,\~\?\*]
114 WHITE           [ \t\n\r]+ 
115
116 NOCFILENAMECHAR [_a-zA-Z0-9\/\.\-\_\+\$\:\[\]\\\~]
117
118 V_TAG [.$_a-zA-Z][._a-zA-Z0-9]*
119 V_IDENTIFIER [*?.$_a-zA-Z]([*?.$_a-zA-Z0-9]|::)*
120
121 %s SCRIPT
122 %s EXPRESSION
123 %s BOTH
124 %s DEFSYMEXP
125 %s MRI
126 %s VERS_START
127 %s VERS_SCRIPT
128 %s VERS_NODE
129 %%
130
131   if (parser_input != input_selected)
132     {
133       /* The first token of the input determines the initial parser state.  */
134       input_type t = parser_input;
135       parser_input = input_selected;
136       switch (t)
137         {
138         case input_script: return INPUT_SCRIPT; break;
139         case input_mri_script: return INPUT_MRI_SCRIPT; break;
140         case input_version_script: return INPUT_VERSION_SCRIPT; break;
141         case input_defsym: return INPUT_DEFSYM; break;
142         default: abort ();
143         }
144     }
145
146 <BOTH,SCRIPT,EXPRESSION>"/*"    { comment(); }
147
148
149 <DEFSYMEXP>"-"                  { RTOKEN('-');}
150 <DEFSYMEXP>"+"                  { RTOKEN('+');}
151 <DEFSYMEXP>{FILENAMECHAR1}{SYMBOLCHARN}*   { yylval.name = xstrdup(yytext); return NAME; }
152 <DEFSYMEXP>"="                  { RTOKEN('='); }
153
154 <MRI,EXPRESSION>"$"([0-9A-Fa-f])+ {
155                                 yylval.integer = bfd_scan_vma (yytext+1, 0,16);
156                                 return INT;
157                         }
158
159 <MRI,EXPRESSION>([0-9A-Fa-f])+(H|h|X|x|B|b|O|o|D|d) {
160                                    int ibase ;
161                                    switch (yytext[yyleng-1]) {
162                                     case 'X': 
163                                     case 'x':
164                                     case 'H':
165                                     case 'h':
166                                      ibase = 16;
167                                      break;
168                                     case 'O':
169                                     case 'o':
170                                      ibase = 8;
171                                      break;
172                                     case 'B':
173                                     case 'b':
174                                      ibase = 2;
175                                      break;
176                                     default:
177                                      ibase = 10;
178                                    }
179                                    yylval.integer = bfd_scan_vma (yytext, 0,
180                                                                   ibase);
181                                    return INT;
182                                  }
183 <SCRIPT,DEFSYMEXP,MRI,BOTH,EXPRESSION>((("$"|"0x")([0-9A-Fa-f])+)|(([0-9])+))(M|K|m|k)? {
184                                   char *s = yytext;
185
186                                   if (*s == '$')
187                                     ++s;
188                                   yylval.integer = bfd_scan_vma (s, 0, 0);
189                                   if (yytext[yyleng-1] == 'M'
190                                       || yytext[yyleng-1] == 'm')
191                                     yylval.integer *= 1024 * 1024;
192                                   if (yytext[yyleng-1] == 'K' 
193                                       || yytext[yyleng-1]=='k')
194                                     yylval.integer *= 1024;
195                                   return INT;
196                                 }
197 <BOTH,SCRIPT,EXPRESSION,MRI>"]"         { RTOKEN(']');}
198 <BOTH,SCRIPT,EXPRESSION,MRI>"["         { RTOKEN('[');}
199 <BOTH,SCRIPT,EXPRESSION,MRI>"<<="       { RTOKEN(LSHIFTEQ);}
200 <BOTH,SCRIPT,EXPRESSION,MRI>">>="       { RTOKEN(RSHIFTEQ);}
201 <BOTH,SCRIPT,EXPRESSION,MRI>"||"        { RTOKEN(OROR);}
202 <BOTH,SCRIPT,EXPRESSION,MRI>"=="        { RTOKEN(EQ);}
203 <BOTH,SCRIPT,EXPRESSION,MRI>"!="        { RTOKEN(NE);}
204 <BOTH,SCRIPT,EXPRESSION,MRI>">="        { RTOKEN(GE);}
205 <BOTH,SCRIPT,EXPRESSION,MRI>"<="        { RTOKEN(LE);}
206 <BOTH,SCRIPT,EXPRESSION,MRI>"<<"        { RTOKEN(LSHIFT);}
207 <BOTH,SCRIPT,EXPRESSION,MRI>">>"        { RTOKEN(RSHIFT);}
208 <BOTH,SCRIPT,EXPRESSION,MRI>"+="        { RTOKEN(PLUSEQ);}
209 <BOTH,SCRIPT,EXPRESSION,MRI>"-="        { RTOKEN(MINUSEQ);}
210 <BOTH,SCRIPT,EXPRESSION,MRI>"*="        { RTOKEN(MULTEQ);}
211 <BOTH,SCRIPT,EXPRESSION,MRI>"/="        { RTOKEN(DIVEQ);}
212 <BOTH,SCRIPT,EXPRESSION,MRI>"&="        { RTOKEN(ANDEQ);}
213 <BOTH,SCRIPT,EXPRESSION,MRI>"|="        { RTOKEN(OREQ);}
214 <BOTH,SCRIPT,EXPRESSION,MRI>"&&"        { RTOKEN(ANDAND);}
215 <BOTH,SCRIPT,EXPRESSION,MRI>">"         { RTOKEN('>');}
216 <BOTH,SCRIPT,EXPRESSION,MRI>","         { RTOKEN(',');}
217 <BOTH,SCRIPT,EXPRESSION,MRI>"&"         { RTOKEN('&');}
218 <BOTH,SCRIPT,EXPRESSION,MRI>"|"         { RTOKEN('|');}
219 <BOTH,SCRIPT,EXPRESSION,MRI>"~"         { RTOKEN('~');}
220 <BOTH,SCRIPT,EXPRESSION,MRI>"!"         { RTOKEN('!');}
221 <BOTH,SCRIPT,EXPRESSION,MRI>"?"         { RTOKEN('?');}
222 <BOTH,SCRIPT,EXPRESSION,MRI>"*"         { RTOKEN('*');}
223 <BOTH,SCRIPT,EXPRESSION,MRI>"+"         { RTOKEN('+');}
224 <BOTH,SCRIPT,EXPRESSION,MRI>"-"         { RTOKEN('-');}
225 <BOTH,SCRIPT,EXPRESSION,MRI>"/"         { RTOKEN('/');}
226 <BOTH,SCRIPT,EXPRESSION,MRI>"%"         { RTOKEN('%');}
227 <BOTH,SCRIPT,EXPRESSION,MRI>"<"         { RTOKEN('<');}
228 <BOTH,SCRIPT,EXPRESSION,MRI>"="          { RTOKEN('=');}
229 <BOTH,SCRIPT,EXPRESSION,MRI>"}"                 { RTOKEN('}') ; }
230 <BOTH,SCRIPT,EXPRESSION,MRI>"{"                 { RTOKEN('{'); }
231 <BOTH,SCRIPT,EXPRESSION,MRI>")"                 { RTOKEN(')');}
232 <BOTH,SCRIPT,EXPRESSION,MRI>"("                 { RTOKEN('(');}
233 <BOTH,SCRIPT,EXPRESSION,MRI>":"         { RTOKEN(':'); }
234 <BOTH,SCRIPT,EXPRESSION,MRI>";"         { RTOKEN(';');}
235 <BOTH,SCRIPT>"MEMORY"           { RTOKEN(MEMORY);}
236 <BOTH,SCRIPT>"ORIGIN"           { RTOKEN(ORIGIN);}
237 <BOTH,SCRIPT>"VERSION"          { RTOKEN(VERSIONK);}
238 <EXPRESSION,BOTH,SCRIPT>"BLOCK"         { RTOKEN(BLOCK);}
239 <EXPRESSION,BOTH,SCRIPT>"BIND"          { RTOKEN(BIND);}
240 <BOTH,SCRIPT>"LENGTH"           { RTOKEN(LENGTH);}
241 <EXPRESSION,BOTH,SCRIPT>"ALIGN"                 { RTOKEN(ALIGN_K);}
242 <EXPRESSION,BOTH,SCRIPT>"ADDR"                  { RTOKEN(ADDR);}
243 <EXPRESSION,BOTH,SCRIPT>"LOADADDR"              { RTOKEN(LOADADDR);}
244 <EXPRESSION,BOTH>"MAX"                  { RTOKEN(MAX_K); }
245 <EXPRESSION,BOTH>"MIN"                  { RTOKEN(MIN_K); }
246 <EXPRESSION,BOTH>"ASSERT"               { RTOKEN(ASSERT_K); }
247 <BOTH,SCRIPT>"ENTRY"                    { RTOKEN(ENTRY);}
248 <BOTH,SCRIPT,MRI>"EXTERN"               { RTOKEN(EXTERN);}
249 <EXPRESSION,BOTH,SCRIPT>"NEXT"                  { RTOKEN(NEXT);}
250 <EXPRESSION,BOTH,SCRIPT>"sizeof_headers"        { RTOKEN(SIZEOF_HEADERS);}
251 <EXPRESSION,BOTH,SCRIPT>"SIZEOF_HEADERS"        { RTOKEN(SIZEOF_HEADERS);}
252 <BOTH,SCRIPT>"MAP"                      { RTOKEN(MAP);}
253 <EXPRESSION,BOTH,SCRIPT>"SIZEOF"                { RTOKEN(SIZEOF);}
254 <BOTH,SCRIPT>"TARGET"           { RTOKEN(TARGET_K);}
255 <BOTH,SCRIPT>"SEARCH_DIR"               { RTOKEN(SEARCH_DIR);}
256 <BOTH,SCRIPT>"OUTPUT"           { RTOKEN(OUTPUT);}
257 <BOTH,SCRIPT>"INPUT"                    { RTOKEN(INPUT);}
258 <EXPRESSION,BOTH,SCRIPT>"GROUP"         { RTOKEN(GROUP);}
259 <EXPRESSION,BOTH,SCRIPT>"DEFINED"               { RTOKEN(DEFINED);}
260 <BOTH,SCRIPT>"CREATE_OBJECT_SYMBOLS"    { RTOKEN(CREATE_OBJECT_SYMBOLS);}
261 <BOTH,SCRIPT>"CONSTRUCTORS"             { RTOKEN( CONSTRUCTORS);}
262 <BOTH,SCRIPT>"FORCE_COMMON_ALLOCATION" { RTOKEN(FORCE_COMMON_ALLOCATION);}
263 <BOTH,SCRIPT>"INHIBIT_COMMON_ALLOCATION" { RTOKEN(INHIBIT_COMMON_ALLOCATION);}
264 <BOTH,SCRIPT>"SECTIONS"         { RTOKEN(SECTIONS);}
265 <BOTH,SCRIPT>"FILL"                     { RTOKEN(FILL);}
266 <BOTH,SCRIPT>"STARTUP"          { RTOKEN(STARTUP);}
267 <BOTH,SCRIPT>"OUTPUT_FORMAT"            { RTOKEN(OUTPUT_FORMAT);}
268 <BOTH,SCRIPT>"OUTPUT_ARCH"              { RTOKEN( OUTPUT_ARCH);}
269 <BOTH,SCRIPT>"HLL"                      { RTOKEN(HLL);}
270 <BOTH,SCRIPT>"SYSLIB"           { RTOKEN(SYSLIB);}
271 <BOTH,SCRIPT>"FLOAT"                    { RTOKEN(FLOAT);}
272 <BOTH,SCRIPT>"QUAD"                     { RTOKEN( QUAD);}
273 <BOTH,SCRIPT>"SQUAD"                    { RTOKEN( SQUAD);}
274 <BOTH,SCRIPT>"LONG"                     { RTOKEN( LONG);}
275 <BOTH,SCRIPT>"SHORT"                    { RTOKEN( SHORT);}
276 <BOTH,SCRIPT>"BYTE"                     { RTOKEN( BYTE);}
277 <BOTH,SCRIPT>"NOFLOAT"          { RTOKEN(NOFLOAT);}
278 <EXPRESSION,BOTH,SCRIPT>"NOCROSSREFS"   { RTOKEN(NOCROSSREFS);}
279 <BOTH,SCRIPT>"OVERLAY"                  { RTOKEN(OVERLAY); }
280 <BOTH,SCRIPT>"SORT"                     { RTOKEN(SORT); }
281 <EXPRESSION,BOTH,SCRIPT>"NOLOAD"        { RTOKEN(NOLOAD);}
282 <EXPRESSION,BOTH,SCRIPT>"DSECT"         { RTOKEN(DSECT);}
283 <EXPRESSION,BOTH,SCRIPT>"COPY"          { RTOKEN(COPY);}
284 <EXPRESSION,BOTH,SCRIPT>"INFO"          { RTOKEN(INFO);}
285 <EXPRESSION,BOTH,SCRIPT>"OVERLAY"       { RTOKEN(OVERLAY);}
286 <BOTH,SCRIPT>"o"                        { RTOKEN(ORIGIN);}
287 <BOTH,SCRIPT>"org"                      { RTOKEN(ORIGIN);}
288 <BOTH,SCRIPT>"l"                        { RTOKEN( LENGTH);}
289 <BOTH,SCRIPT>"len"                      { RTOKEN( LENGTH);}
290 <BOTH,SCRIPT>"INCLUDE"                  { RTOKEN(INCLUDE);}
291 <BOTH,SCRIPT>"PHDRS"                    { RTOKEN (PHDRS); }
292 <EXPRESSION,BOTH,SCRIPT>"AT"                    { RTOKEN(AT);}
293 <EXPRESSION,BOTH,SCRIPT>"PROVIDE"               { RTOKEN(PROVIDE); }
294 <EXPRESSION,BOTH,SCRIPT>"KEEP"          { RTOKEN(KEEP); }
295 <EXPRESSION,BOTH,SCRIPT>"EXCLUDE_FILE"        { RTOKEN(EXCLUDE_FILE); }
296 <MRI>"#".*\n?                   { ++ lineno; }
297 <MRI>"\n"                       { ++ lineno;  RTOKEN(NEWLINE); }
298 <MRI>"*".*                      { /* Mri comment line */ }
299 <MRI>";".*                      { /* Mri comment line */ }
300 <MRI>"END"                      { RTOKEN(ENDWORD); }
301 <MRI>"ALIGNMOD"         { RTOKEN(ALIGNMOD);}
302 <MRI>"ALIGN"            { RTOKEN(ALIGN_K);}
303 <MRI>"CHIP"                     { RTOKEN(CHIP); }
304 <MRI>"BASE"                     { RTOKEN(BASE); }
305 <MRI>"ALIAS"                     { RTOKEN(ALIAS); }
306 <MRI>"TRUNCATE"                     { RTOKEN(TRUNCATE); }
307 <MRI>"LOAD"                     { RTOKEN(LOAD); }
308 <MRI>"PUBLIC"                   { RTOKEN(PUBLIC); }
309 <MRI>"ORDER"                    { RTOKEN(ORDER); }
310 <MRI>"NAME"                     { RTOKEN(NAMEWORD); }
311 <MRI>"FORMAT"                   { RTOKEN(FORMAT); }
312 <MRI>"CASE"                     { RTOKEN(CASE); }
313 <MRI>"START"                    { RTOKEN(START); }
314 <MRI>"LIST".*                   { RTOKEN(LIST); /* LIST and ignore to end of line */ }
315 <MRI>"SECT"                     { RTOKEN(SECT); }
316 <EXPRESSION,BOTH,SCRIPT,MRI>"ABSOLUTE"                  { RTOKEN(ABSOLUTE); }
317 <MRI>"end"                      { RTOKEN(ENDWORD); }
318 <MRI>"alignmod"         { RTOKEN(ALIGNMOD);}
319 <MRI>"align"            { RTOKEN(ALIGN_K);}
320 <MRI>"chip"                     { RTOKEN(CHIP); }
321 <MRI>"base"                     { RTOKEN(BASE); }
322 <MRI>"alias"                     { RTOKEN(ALIAS); }
323 <MRI>"truncate"                     { RTOKEN(TRUNCATE); }
324 <MRI>"load"                     { RTOKEN(LOAD); }
325 <MRI>"public"                   { RTOKEN(PUBLIC); }
326 <MRI>"order"                    { RTOKEN(ORDER); }
327 <MRI>"name"                     { RTOKEN(NAMEWORD); }
328 <MRI>"format"                   { RTOKEN(FORMAT); }
329 <MRI>"case"                     { RTOKEN(CASE); }
330 <MRI>"extern"                   { RTOKEN(EXTERN); }
331 <MRI>"start"                    { RTOKEN(START); }
332 <MRI>"list".*                   { RTOKEN(LIST); /* LIST and ignore to end of line */ }
333 <MRI>"sect"                     { RTOKEN(SECT); }
334 <EXPRESSION,BOTH,SCRIPT,MRI>"absolute"                  { RTOKEN(ABSOLUTE); }
335
336 <MRI>{FILENAMECHAR1}{NOCFILENAMECHAR}*  {
337 /* Filename without commas, needed to parse mri stuff */
338                                  yylval.name = xstrdup(yytext); 
339                                   return NAME;
340                                 }
341
342
343 <BOTH,EXPRESSION>{FILENAMECHAR1}{FILENAMECHAR}* {
344                                  yylval.name = xstrdup(yytext); 
345                                   return NAME;
346                                 }
347 <BOTH,EXPRESSION>"-l"{FILENAMECHAR}+ {
348                                   yylval.name = xstrdup (yytext + 2);
349                                   return LNAME;
350                                 }
351 <SCRIPT>{WILDCHAR}* {
352                 /* Annoyingly, this pattern can match comments, and we have
353                    longest match issues to consider.  So if the first two
354                    characters are a comment opening, put the input back and
355                    try again.  */
356                 if (yytext[0] == '/' && yytext[1] == '*')
357                   {
358                     yyless(2);
359                     comment ();
360                   }
361                 else
362                   {
363                     yylval.name = xstrdup(yytext);
364                     return NAME;
365                   }
366         }
367
368 <EXPRESSION,BOTH,SCRIPT,VERS_NODE>"\""[^\"]*"\"" {
369                                         /* No matter the state, quotes
370                                            give what's inside */
371                                         yylval.name = xstrdup(yytext+1);
372                                         yylval.name[yyleng-2] = 0;
373                                         return NAME;
374                                 }
375 <BOTH,SCRIPT,EXPRESSION>"\n"            { lineno++;}
376 <MRI,BOTH,SCRIPT,EXPRESSION>[ \t\r]+    { }
377
378 <VERS_NODE,VERS_SCRIPT>[:,;]    { return *yytext; }
379
380 <VERS_NODE>global               { RTOKEN(GLOBAL); }
381
382 <VERS_NODE>local                { RTOKEN(LOCAL); }
383
384 <VERS_NODE>extern               { RTOKEN(EXTERN); }
385
386 <VERS_NODE>{V_IDENTIFIER}       { yylval.name = xstrdup (yytext);
387                                   return VERS_IDENTIFIER; }
388
389 <VERS_SCRIPT>{V_TAG}            { yylval.name = xstrdup (yytext);
390                                   return VERS_TAG; }
391
392 <VERS_START>"{"                 { BEGIN(VERS_SCRIPT); return *yytext; }
393
394 <VERS_SCRIPT>"{"                { BEGIN(VERS_NODE); 
395                                   vers_node_nesting = 0;
396                                   return *yytext;
397                                 }
398 <VERS_SCRIPT>"}"                { return *yytext; }
399 <VERS_NODE>"{"                  { vers_node_nesting++; return *yytext; }
400 <VERS_NODE>"}"                  { if (--vers_node_nesting < 0)
401                                     BEGIN(VERS_SCRIPT);
402                                   return *yytext;
403                                 }
404
405 <VERS_START,VERS_NODE,VERS_SCRIPT>[\n]          { lineno++; }
406
407 <VERS_START,VERS_NODE,VERS_SCRIPT>#.*           { /* Eat up comments */ }
408
409 <VERS_START,VERS_NODE,VERS_SCRIPT>[ \t\r]+      { /* Eat up whitespace */ }
410
411 <<EOF>> {
412   include_stack_ptr--;
413     
414   if (include_stack_ptr == 0) 
415   {
416     yyterminate();
417   }
418   else 
419   {
420     yy_switch_to_buffer(include_stack[include_stack_ptr]);
421
422   }
423   BEGIN(SCRIPT);
424   ldfile_input_filename = file_name_stack[include_stack_ptr - 1];
425   lineno = lineno_stack[include_stack_ptr - 1];
426
427   return END;
428 }
429
430 <SCRIPT,MRI,VERS_START,VERS_SCRIPT,VERS_NODE>.  lex_warn_invalid(" in script", yytext);
431 <EXPRESSION,DEFSYMEXP,BOTH>.    lex_warn_invalid(" in expression", yytext);
432     
433 %%
434 \f
435
436 /* Switch flex to reading script file NAME, open on FILE,
437    saving the current input info on the include stack.  */
438
439 void
440 lex_push_file (file, name)
441      FILE *file;
442      const char *name;
443 {
444   if (include_stack_ptr >= MAX_INCLUDE_DEPTH) 
445     {
446       einfo("%F:includes nested too deeply\n");
447     }
448   file_name_stack[include_stack_ptr] = name;
449   lineno_stack[include_stack_ptr] = 1;
450   include_stack[include_stack_ptr] = YY_CURRENT_BUFFER;
451
452   include_stack_ptr++;
453   yyin = file;
454   yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
455   BEGIN (SCRIPT);
456 }
457
458 /* Return a newly created flex input buffer containing STRING,
459    which is SIZE bytes long.  */
460
461 static YY_BUFFER_STATE 
462 yy_create_string_buffer (string, size)
463      CONST char *string;
464      size_t size;
465 {
466   YY_BUFFER_STATE b;
467
468   /* Calls to m-alloc get turned by sed into xm-alloc.  */
469   b = (YY_BUFFER_STATE) malloc (sizeof (struct yy_buffer_state));
470   b->yy_input_file = 0;
471   b->yy_buf_size = size;
472
473   /* yy_ch_buf has to be 2 characters longer than the size given because
474      we need to put in 2 end-of-buffer characters.  */
475   b->yy_ch_buf = (char *) malloc ((unsigned) (b->yy_buf_size + 3));
476
477   b->yy_ch_buf[0] = '\n';
478   strcpy (b->yy_ch_buf+1, string);
479   b->yy_ch_buf[size+1] = YY_END_OF_BUFFER_CHAR;
480   b->yy_ch_buf[size+2] = YY_END_OF_BUFFER_CHAR;
481   b->yy_n_chars = size+1;
482   b->yy_buf_pos = &b->yy_ch_buf[1];
483
484   b->yy_is_our_buffer = 1;
485   b->yy_is_interactive = 0;
486   b->yy_at_bol = 1;
487   b->yy_fill_buffer = 0;
488
489   /* flex 2.4.7 changed the interface.  FIXME: We should not be using
490      a flex internal interface in the first place!  */
491 #ifdef YY_BUFFER_NEW
492   b->yy_buffer_status = YY_BUFFER_NEW;
493 #else
494   b->yy_eof_status = EOF_NOT_SEEN;
495 #endif
496
497   return b;
498 }
499
500 /* Switch flex to reading from STRING, saving the current input info
501    on the include stack.  */
502
503 void
504 lex_redirect (string)
505      CONST char *string;
506 {
507   YY_BUFFER_STATE tmp;
508
509   yy_init = 0;
510   if (include_stack_ptr >= MAX_INCLUDE_DEPTH) 
511     {
512       einfo("%F: macros nested too deeply\n");
513     }
514   file_name_stack[include_stack_ptr] = "redirect";
515   lineno_stack[include_stack_ptr] = 0;
516   include_stack[include_stack_ptr] = YY_CURRENT_BUFFER;
517   include_stack_ptr++;
518   tmp = yy_create_string_buffer (string, strlen (string));
519   yy_switch_to_buffer (tmp);
520   BEGIN (SCRIPT);
521 }
522 \f
523 /* Functions to switch to a different flex start condition,
524    saving the current start condition on `state_stack'.  */
525
526 static int state_stack[MAX_INCLUDE_DEPTH * 2];
527 static int *state_stack_p = state_stack;
528
529 void
530 ldlex_script ()
531 {
532   *(state_stack_p)++ = yy_start;
533   BEGIN (SCRIPT);
534 }
535
536 void
537 ldlex_mri_script ()
538 {
539   *(state_stack_p)++ = yy_start;
540   BEGIN (MRI);
541 }
542
543 void
544 ldlex_version_script ()
545 {
546   *(state_stack_p)++ = yy_start;
547   BEGIN (VERS_START);
548 }
549
550 void
551 ldlex_version_file ()
552 {
553   *(state_stack_p)++ = yy_start;
554   BEGIN (VERS_SCRIPT);
555 }
556
557 void
558 ldlex_defsym ()
559 {
560   *(state_stack_p)++ = yy_start;
561   BEGIN (DEFSYMEXP);
562 }
563            
564 void
565 ldlex_expression ()
566 {
567   *(state_stack_p)++ = yy_start;
568   BEGIN (EXPRESSION);
569 }
570
571 void
572 ldlex_both ()
573 {
574   *(state_stack_p)++ = yy_start;
575   BEGIN (BOTH);
576 }
577
578 void
579 ldlex_popstate ()
580 {
581   yy_start = *(--state_stack_p);
582 }
583 \f
584
585 /* Place up to MAX_SIZE characters in BUF and return in *RESULT
586    either the number of characters read, or 0 to indicate EOF.  */
587
588 static void
589 yy_input (buf, result, max_size)
590      char *buf;
591      int *result;
592      int max_size;
593 {
594   *result = 0; 
595   if (yy_current_buffer->yy_input_file)
596     {
597       if (yyin)
598         {
599           *result = read (fileno (yyin), (char *) buf, max_size);
600           if (*result < 0) 
601             einfo ("%F%P: read in flex scanner failed\n");
602         }
603     }
604 }
605
606 /* Eat the rest of a C-style comment.  */
607
608 static void
609 comment ()
610 {
611   int c;
612
613   while (1)
614   {
615     c = input();
616     while (c != '*' && c != EOF) 
617     {
618       if (c == '\n')
619         lineno++;
620       c = input();
621     }
622
623     if (c == '*')
624     {
625       c = input();
626       while (c == '*')
627        c = input();
628       if (c == '/')
629        break;                   /* found the end */
630     }
631
632     if (c == '\n')
633       lineno++;
634
635     if (c == EOF)
636     {
637       einfo( "%F%P: EOF in comment\n");
638       break;
639     }
640   }
641 }
642
643 /* Warn the user about a garbage character WHAT in the input
644    in context WHERE.  */
645
646 static void
647 lex_warn_invalid (where, what)
648      char *where, *what;
649 {
650   char buf[5];
651
652   /* If we have found an input file whose format we do not recognize,
653      and we are therefore treating it as a linker script, and we find
654      an invalid character, then most likely this is a real object file
655      of some different format.  Treat it as such.  */
656   if (ldfile_assumed_script)
657     {
658       bfd_set_error (bfd_error_file_not_recognized);
659       einfo ("%F%s: file not recognized: %E\n", ldfile_input_filename);
660     }
661
662   if (! ISPRINT (*what))
663     {
664       sprintf (buf, "\\%03o", (unsigned int) *what);
665       what = buf;
666     }
667
668   einfo ("%P:%S: ignoring invalid character `%s'%s\n", what, where);
669 }