1 /* This is the Assembler Pre-Processor
2 Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
4 Free Software Foundation, Inc.
6 This file is part of GAS, the GNU Assembler.
8 GAS 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)
13 GAS 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 GAS; see the file COPYING. If not, write to the Free
20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
23 /* Modified by Allen Wirfs-Brock, Instantiations Inc 2/90. */
24 /* App, the assembler pre-processor. This pre-processor strips out excess
25 spaces, turns single-quoted characters into a decimal constant, and turns
26 # <number> <filename> <garbage> into a .line <number>\n.file <filename>
27 pair. This needs better error-handling. */
30 #include "as.h" /* For BAD_CASE() only. */
34 #define const /* empty */
39 /* Whether we are scrubbing in m68k MRI mode. This is different from
40 flag_m68k_mri, because the two flags will be affected by the .mri
41 pseudo-op at different times. */
42 static int scrub_m68k_mri;
44 /* The pseudo-op which switches in and out of MRI mode. See the
45 comment in do_scrub_chars. */
46 static const char mri_pseudo[] = ".mri 0";
48 #define scrub_m68k_mri 0
51 #if defined TC_ARM && defined OBJ_ELF
52 /* The pseudo-op for which we need to special-case `@' characters.
53 See the comment in do_scrub_chars. */
54 static const char symver_pseudo[] = ".symver";
55 static const char * symver_state;
59 static const char symbol_chars[] =
60 "$._ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
62 #define LEX_IS_SYMBOL_COMPONENT 1
63 #define LEX_IS_WHITESPACE 2
64 #define LEX_IS_LINE_SEPARATOR 3
65 #define LEX_IS_COMMENT_START 4
66 #define LEX_IS_LINE_COMMENT_START 5
67 #define LEX_IS_TWOCHAR_COMMENT_1ST 6
68 #define LEX_IS_STRINGQUOTE 8
69 #define LEX_IS_COLON 9
70 #define LEX_IS_NEWLINE 10
71 #define LEX_IS_ONECHAR_QUOTE 11
73 #define LEX_IS_DOUBLEDASH_1ST 12
76 #define DOUBLEBAR_PARALLEL
78 #ifdef DOUBLEBAR_PARALLEL
79 #define LEX_IS_DOUBLEBAR_1ST 13
81 #define LEX_IS_PARALLEL_SEPARATOR 14
82 #define IS_SYMBOL_COMPONENT(c) (lex[c] == LEX_IS_SYMBOL_COMPONENT)
83 #define IS_WHITESPACE(c) (lex[c] == LEX_IS_WHITESPACE)
84 #define IS_LINE_SEPARATOR(c) (lex[c] == LEX_IS_LINE_SEPARATOR)
85 #define IS_PARALLEL_SEPARATOR(c) (lex[c] == LEX_IS_PARALLEL_SEPARATOR)
86 #define IS_COMMENT(c) (lex[c] == LEX_IS_COMMENT_START)
87 #define IS_LINE_COMMENT(c) (lex[c] == LEX_IS_LINE_COMMENT_START)
88 #define IS_NEWLINE(c) (lex[c] == LEX_IS_NEWLINE)
90 static int process_escape (int);
92 /* FIXME-soon: The entire lexer/parser thingy should be
93 built statically at compile time rather than dynamically
94 each and every time the assembler is run. xoxorich. */
97 do_scrub_begin (int m68k_mri ATTRIBUTE_UNUSED)
102 lex[' '] = LEX_IS_WHITESPACE;
103 lex['\t'] = LEX_IS_WHITESPACE;
104 lex['\r'] = LEX_IS_WHITESPACE;
105 lex['\n'] = LEX_IS_NEWLINE;
106 lex[':'] = LEX_IS_COLON;
109 scrub_m68k_mri = m68k_mri;
114 lex['"'] = LEX_IS_STRINGQUOTE;
116 #if ! defined (TC_HPPA) && ! defined (TC_I370)
117 /* I370 uses single-quotes to delimit integer, float constants. */
118 lex['\''] = LEX_IS_ONECHAR_QUOTE;
121 #ifdef SINGLE_QUOTE_STRINGS
122 lex['\''] = LEX_IS_STRINGQUOTE;
126 /* Note: if any other character can be LEX_IS_STRINGQUOTE, the loop
127 in state 5 of do_scrub_chars must be changed. */
129 /* Note that these override the previous defaults, e.g. if ';' is a
130 comment char, then it isn't a line separator. */
131 for (p = symbol_chars; *p; ++p)
132 lex[(unsigned char) *p] = LEX_IS_SYMBOL_COMPONENT;
134 for (c = 128; c < 256; ++c)
135 lex[c] = LEX_IS_SYMBOL_COMPONENT;
137 #ifdef tc_symbol_chars
138 /* This macro permits the processor to specify all characters which
139 may appears in an operand. This will prevent the scrubber from
140 discarding meaningful whitespace in certain cases. The i386
141 backend uses this to support prefixes, which can confuse the
142 scrubber as to whether it is parsing operands or opcodes. */
143 for (p = tc_symbol_chars; *p; ++p)
144 lex[(unsigned char) *p] = LEX_IS_SYMBOL_COMPONENT;
147 /* The m68k backend wants to be able to change comment_chars. */
148 #ifndef tc_comment_chars
149 #define tc_comment_chars comment_chars
151 for (p = tc_comment_chars; *p; p++)
152 lex[(unsigned char) *p] = LEX_IS_COMMENT_START;
154 for (p = line_comment_chars; *p; p++)
155 lex[(unsigned char) *p] = LEX_IS_LINE_COMMENT_START;
157 for (p = line_separator_chars; *p; p++)
158 lex[(unsigned char) *p] = LEX_IS_LINE_SEPARATOR;
160 #ifdef tc_parallel_separator_chars
161 /* This macro permits the processor to specify all characters which
162 separate parallel insns on the same line. */
163 for (p = tc_parallel_separator_chars; *p; p++)
164 lex[(unsigned char) *p] = LEX_IS_PARALLEL_SEPARATOR;
167 /* Only allow slash-star comments if slash is not in use.
168 FIXME: This isn't right. We should always permit them. */
170 lex['/'] = LEX_IS_TWOCHAR_COMMENT_1ST;
175 lex['\''] = LEX_IS_STRINGQUOTE;
176 lex[';'] = LEX_IS_COMMENT_START;
177 lex['*'] = LEX_IS_LINE_COMMENT_START;
178 /* The MRI documentation says '!' is LEX_IS_COMMENT_START, but
179 then it can't be used in an expression. */
180 lex['!'] = LEX_IS_LINE_COMMENT_START;
185 lex['-'] = LEX_IS_DOUBLEDASH_1ST;
187 #ifdef DOUBLEBAR_PARALLEL
188 lex['|'] = LEX_IS_DOUBLEBAR_1ST;
191 /* Must do this is we want VLIW instruction with "->" or "<-". */
192 lex['-'] = LEX_IS_SYMBOL_COMPONENT;
196 /* Saved state of the scrubber. */
198 static int old_state;
199 static char *out_string;
200 static char out_buf[20];
201 static int add_newlines;
202 static char *saved_input;
203 static int saved_input_len;
204 static char input_buffer[32 * 1024];
205 static const char *mri_state;
206 static char mri_last_ch;
208 /* Data structure for saving the state of app across #include's. Note that
209 app is called asynchronously to the parsing of the .include's, so our
210 state at the time .include is interpreted is completely unrelated.
211 That's why we have to save it all. */
218 char out_buf[sizeof (out_buf)];
225 const char * mri_state;
227 #if defined TC_ARM && defined OBJ_ELF
228 const char * symver_state;
235 register struct app_save *saved;
237 saved = (struct app_save *) xmalloc (sizeof (*saved));
238 saved->state = state;
239 saved->old_state = old_state;
240 saved->out_string = out_string;
241 memcpy (saved->out_buf, out_buf, sizeof (out_buf));
242 saved->add_newlines = add_newlines;
243 if (saved_input == NULL)
244 saved->saved_input = NULL;
247 saved->saved_input = xmalloc (saved_input_len);
248 memcpy (saved->saved_input, saved_input, saved_input_len);
249 saved->saved_input_len = saved_input_len;
252 saved->scrub_m68k_mri = scrub_m68k_mri;
254 saved->mri_state = mri_state;
255 saved->mri_last_ch = mri_last_ch;
256 #if defined TC_ARM && defined OBJ_ELF
257 saved->symver_state = symver_state;
260 /* do_scrub_begin() is not useful, just wastes time. */
265 return (char *) saved;
271 register struct app_save *saved = (struct app_save *) arg;
273 /* There is no do_scrub_end (). */
274 state = saved->state;
275 old_state = saved->old_state;
276 out_string = saved->out_string;
277 memcpy (out_buf, saved->out_buf, sizeof (out_buf));
278 add_newlines = saved->add_newlines;
279 if (saved->saved_input == NULL)
283 assert (saved->saved_input_len <= (int) (sizeof input_buffer));
284 memcpy (input_buffer, saved->saved_input, saved->saved_input_len);
285 saved_input = input_buffer;
286 saved_input_len = saved->saved_input_len;
287 free (saved->saved_input);
290 scrub_m68k_mri = saved->scrub_m68k_mri;
292 mri_state = saved->mri_state;
293 mri_last_ch = saved->mri_last_ch;
294 #if defined TC_ARM && defined OBJ_ELF
295 symver_state = saved->symver_state;
301 /* @@ This assumes that \n &c are the same on host and target. This is not
305 process_escape (int ch)
328 /* This function is called to process input characters. The GET
329 parameter is used to retrieve more input characters. GET should
330 set its parameter to point to a buffer, and return the length of
331 the buffer; it should return 0 at end of file. The scrubbed output
332 characters are put into the buffer starting at TOSTART; the TOSTART
333 buffer is TOLEN bytes in length. The function returns the number
334 of scrubbed characters put into TOSTART. This will be TOLEN unless
335 end of file was seen. This function is arranged as a state
336 machine, and saves its state so that it may return at any point.
337 This is the way the old code used to work. */
340 do_scrub_chars (int (*get) (char *, int), char *tostart, int tolen)
343 char *toend = tostart + tolen;
347 register int ch, ch2 = 0;
349 /*State 0: beginning of normal line
350 1: After first whitespace on line (flush more white)
351 2: After first non-white (opcode) on line (keep 1white)
352 3: after second white on line (into operands) (flush white)
353 4: after putting out a .line, put out digits
354 5: parsing a string, then go to old-state
355 6: putting out \ escape in a "d string.
356 7: After putting out a .appfile, put out string.
357 8: After putting out a .appfile string, flush until newline.
358 9: After seeing symbol char in state 3 (keep 1white after symchar)
359 10: After seeing whitespace in state 9 (keep white before symchar)
360 11: After seeing a symbol character in state 0 (eg a label definition)
361 -1: output string in out_string and go to the state in old_state
362 -2: flush text until a '*' '/' is seen, then go to state old_state
364 12: After seeing a dash, looking for a second dash as a start
367 #ifdef DOUBLEBAR_PARALLEL
368 13: After seeing a vertical bar, looking for a second
369 vertical bar as a parallel expression separator.
372 14: After seeing a `(' at state 0, looking for a `)' as
374 15: After seeing a `(' at state 1, looking for a `)' as
379 /* I added states 9 and 10 because the MIPS ECOFF assembler uses
380 constructs like ``.loc 1 20''. This was turning into ``.loc
381 120''. States 9 and 10 ensure that a space is never dropped in
382 between characters which could appear in an identifier. Ian
383 Taylor, ian@cygnus.com.
385 I added state 11 so that something like "Lfoo add %r25,%r26,%r27" works
386 correctly on the PA (and any other target where colons are optional).
387 Jeff Law, law@cs.utah.edu.
389 I added state 13 so that something like "cmp r1, r2 || trap #1" does not
390 get squashed into "cmp r1,r2||trap#1", with the all important space
391 between the 'trap' and the '#1' being eliminated. nickc@cygnus.com */
393 /* This macro gets the next input character. */
397 ? * (unsigned char *) (from++) \
398 : (saved_input = NULL, \
399 fromlen = (*get) (input_buffer, sizeof input_buffer), \
400 from = input_buffer, \
401 fromend = from + fromlen, \
404 : * (unsigned char *) (from++))))
406 /* This macro pushes a character back on the input stream. */
408 #define UNGET(uch) (*--from = (uch))
410 /* This macro puts a character into the output buffer. If this
411 character fills the output buffer, this macro jumps to the label
412 TOFULL. We use this rather ugly approach because we need to
413 handle two different termination conditions: EOF on the input
414 stream, and a full output buffer. It would be simpler if we
415 always read in the entire input stream before processing it, but
416 I don't want to make such a significant change to the assembler's
428 if (saved_input != NULL)
431 fromend = from + saved_input_len;
435 fromlen = (*get) (input_buffer, sizeof input_buffer);
439 fromend = from + fromlen;
444 /* The cases in this switch end with continue, in order to
445 branch back to the top of this while loop and generate the
446 next output character in the appropriate state. */
451 if (*out_string == '\0')
468 as_warn (_("end of file in comment"));
477 while ((ch = GET ()) == '*')
482 as_warn (_("end of file in comment"));
500 else if (ch >= '0' && ch <= '9')
504 while (ch != EOF && IS_WHITESPACE (ch))
510 out_string = "\n\tappfile ";
512 out_string = "\n\t.appfile ";
519 while (ch != EOF && ch != '\n')
528 /* We are going to copy everything up to a quote character,
529 with special handling for a backslash. We try to
530 optimize the copying in the simple case without using the
531 GET and PUT macros. */
536 for (s = from; s < fromend; s++)
539 /* This condition must be changed if the type of any
540 other character can be LEX_IS_STRINGQUOTE. */
548 if (len > toend - to)
552 memcpy (to, from, len);
561 as_warn (_("end of file in string; inserted '\"'"));
566 else if (lex[ch] == LEX_IS_STRINGQUOTE)
571 #ifndef NO_STRING_ESCAPES
578 else if (scrub_m68k_mri && ch == '\n')
580 /* Just quietly terminate the string. This permits lines like
581 bne label loop if we haven't reach end yet. */
597 /* Handle strings broken across lines, by turning '\n' into
606 as_warn (_("end of file in string; '\"' inserted"));
631 #ifdef ONLY_STANDARD_ESCAPES
632 as_warn (_("unknown escape '\\%c' in string; ignored"), ch);
651 while (ch != '\n' && ch != EOF);
658 #ifdef DOUBLEBAR_PARALLEL
664 /* Reset back to state 1 and pretend that we are parsing a
665 line from just after the first white space. */
672 /* OK, we are somewhere in states 0 through 4 or 9 through 11. */
678 if (ch == '(' && (state == 0 || state == 1))
684 else if (state == 14 || state == 15)
698 #if defined TC_ARM && defined OBJ_ELF
699 /* We need to watch out for .symver directives. See the comment later
701 if (symver_state == NULL)
703 if ((state == 0 || state == 1) && ch == symver_pseudo[0])
704 symver_state = symver_pseudo + 1;
708 /* We advance to the next state if we find the right
710 if (ch != '\0' && (*symver_state == ch))
712 else if (*symver_state != '\0')
713 /* We did not get the expected character, or we didn't
714 get a valid terminating character after seeing the
715 entire pseudo-op, so we must go back to the beginning. */
719 /* We've read the entire pseudo-op. If this is the end
720 of the line, go back to the beginning. */
725 #endif /* TC_ARM && OBJ_ELF */
728 /* We want to have pseudo-ops which control whether we are in
729 MRI mode or not. Unfortunately, since m68k MRI mode affects
730 the scrubber, that means that we need a special purpose
732 if (mri_state == NULL)
734 if ((state == 0 || state == 1)
735 && ch == mri_pseudo[0])
736 mri_state = mri_pseudo + 1;
740 /* We advance to the next state if we find the right
741 character, or if we need a space character and we get any
742 whitespace character, or if we need a '0' and we get a
743 '1' (this is so that we only need one state to handle
744 ``.mri 0'' and ``.mri 1''). */
747 || (*mri_state == ' '
748 && lex[ch] == LEX_IS_WHITESPACE)
749 || (*mri_state == '0'
755 else if (*mri_state != '\0'
756 || (lex[ch] != LEX_IS_WHITESPACE
757 && lex[ch] != LEX_IS_NEWLINE))
759 /* We did not get the expected character, or we didn't
760 get a valid terminating character after seeing the
761 entire pseudo-op, so we must go back to the
767 /* We've read the entire pseudo-op. mips_last_ch is
768 either '0' or '1' indicating whether to enter or
770 do_scrub_begin (mri_last_ch == '1');
773 /* We continue handling the character as usual. The
774 main gas reader must also handle the .mri pseudo-op
775 to control expression parsing and the like. */
784 as_warn (_("end of file not at end of a line; newline inserted"));
793 case LEX_IS_WHITESPACE:
798 while (ch != EOF && IS_WHITESPACE (ch));
804 /* Preserve a single whitespace character at the
805 beginning of a line. */
812 #ifdef KEEP_WHITE_AROUND_COLON
813 if (lex[ch] == LEX_IS_COLON)
815 /* Only keep this white if there's no white *after* the
819 if (!IS_WHITESPACE (ch2))
830 || IS_LINE_SEPARATOR (ch)
831 || IS_PARALLEL_SEPARATOR (ch))
835 /* In MRI mode, we keep these spaces. */
843 /* If we're in state 2 or 11, we've seen a non-white
844 character followed by whitespace. If the next character
845 is ':', this is whitespace after a label name which we
846 normally must ignore. In MRI mode, though, spaces are
847 not permitted between the label and the colon. */
848 if ((state == 2 || state == 11)
849 && lex[ch] == LEX_IS_COLON
861 goto recycle; /* Punted leading sp */
863 /* We can arrive here if we leave a leading whitespace
864 character at the beginning of a line. */
870 /* Optimize common case by skipping UNGET/GET. */
871 PUT (' '); /* Sp after opco */
880 /* In MRI mode, we keep these spaces. */
885 goto recycle; /* Sp in operands */
890 /* In MRI mode, we keep these spaces. */
896 state = 10; /* Sp after symbol char */
899 if (LABELS_WITHOUT_COLONS || flag_m68k_mri)
903 /* We know that ch is not ':', since we tested that
904 case above. Therefore this is not a label, so it
905 must be the opcode, and we've just seen the
906 whitespace after it. */
910 PUT (' '); /* Sp after label definition. */
917 case LEX_IS_TWOCHAR_COMMENT_1ST:
926 if (ch2 != EOF && IS_NEWLINE (ch2))
929 while (ch2 != EOF && ch2 != '*');
934 if (ch2 == EOF || ch2 == '/')
937 /* This UNGET will ensure that we count newlines
943 as_warn (_("end of file in multiline comment"));
948 #ifdef DOUBLESLASH_LINE_COMMENTS
955 while (ch != EOF && !IS_NEWLINE (ch));
957 as_warn ("end of file in comment; newline inserted");
967 if (state == 9 || state == 10)
973 case LEX_IS_STRINGQUOTE:
976 /* Preserve the whitespace in foo "bar". */
981 /* PUT didn't jump out. We could just break, but we
982 know what will happen, so optimize a bit. */
995 case LEX_IS_ONECHAR_QUOTE:
998 /* Preserve the whitespace in foo 'b'. */
1007 as_warn (_("end of file after a one-character quote; \\0 inserted"));
1015 as_warn (_("end of file in escape character"));
1019 ch = process_escape (ch);
1021 sprintf (out_buf, "%d", (int) (unsigned char) ch);
1023 /* None of these 'x constants for us. We want 'x'. */
1024 if ((ch = GET ()) != '\'')
1026 #ifdef REQUIRE_CHAR_CLOSE_QUOTE
1027 as_warn (_("missing close quote; (assumed)"));
1033 if (strlen (out_buf) == 1)
1043 out_string = out_buf;
1044 PUT (*out_string++);
1049 #ifdef KEEP_WHITE_AROUND_COLON
1052 if (state == 9 || state == 10)
1054 else if (state != 3)
1060 case LEX_IS_NEWLINE:
1061 /* Roll out a bunch of newlines from inside comments, etc. */
1069 case LEX_IS_LINE_SEPARATOR:
1074 case LEX_IS_PARALLEL_SEPARATOR:
1080 case LEX_IS_DOUBLEDASH_1ST:
1087 /* Read and skip to end of line. */
1092 while (ch != EOF && ch != '\n');
1095 as_warn (_("end of file in comment; newline inserted"));
1101 #ifdef DOUBLEBAR_PARALLEL
1102 case LEX_IS_DOUBLEBAR_1ST:
1108 /* Handle '||' in two states as invoking PUT twice might
1109 result in the first one jumping out of this loop. We'd
1110 then lose track of the state and one '|' char. */
1115 case LEX_IS_LINE_COMMENT_START:
1116 /* FIXME-someday: The two character comment stuff was badly
1117 thought out. On i386, we want '/' as line comment start
1118 AND we want C style comments. hence this hack. The
1119 whole lexical process should be reworked. xoxorich. */
1135 if (state == 0 || state == 1) /* Only comment at start of line. */
1145 while (ch != EOF && IS_WHITESPACE (ch));
1149 as_warn (_("end of file in comment; newline inserted"));
1154 if (ch < '0' || ch > '9' || state != 0 || startch != '#')
1156 /* Not a cpp line. */
1157 while (ch != EOF && !IS_NEWLINE (ch))
1160 as_warn (_("end of file in comment; newline inserted"));
1165 /* Looks like `# 123 "filename"' from cpp. */
1170 out_string = "\tappline ";
1172 out_string = "\t.appline ";
1173 PUT (*out_string++);
1178 /* All insns end in a char for which LEX_IS_SYMBOL_COMPONENT is true.
1179 Trap is the only short insn that has a first operand that is
1180 neither register nor label.
1181 We must prevent exef0f ||trap #1 to degenerate to exef0f ||trap#1 .
1182 We can't make '#' LEX_IS_SYMBOL_COMPONENT because it is
1183 already LEX_IS_LINE_COMMENT_START. However, it is the
1184 only character in line_comment_chars for d10v, hence we
1185 can recognize it as such. */
1186 /* An alternative approach would be to reset the state to 1 when
1187 we see '||', '<'- or '->', but that seems to be overkill. */
1191 /* We have a line comment character which is not at the
1192 start of a line. If this is also a normal comment
1193 character, fall through. Otherwise treat it as a default
1195 if (strchr (tc_comment_chars, ch) == NULL
1196 && (! scrub_m68k_mri
1197 || (ch != '!' && ch != '*')))
1200 && (ch == '!' || ch == '*' || ch == '#')
1205 case LEX_IS_COMMENT_START:
1206 #if defined TC_ARM && defined OBJ_ELF
1207 /* On the ARM, `@' is the comment character.
1208 Unfortunately this is also a special character in ELF .symver
1209 directives (and .type, though we deal with those another way).
1210 So we check if this line is such a directive, and treat
1211 the character as default if so. This is a hack. */
1212 if ((symver_state != NULL) && (*symver_state == 0))
1215 #ifdef WARN_COMMENTS
1217 as_where (&found_comment_file, &found_comment);
1223 while (ch != EOF && !IS_NEWLINE (ch));
1225 as_warn (_("end of file in comment; newline inserted"));
1230 case LEX_IS_SYMBOL_COMPONENT:
1233 /* This is a symbol character following another symbol
1234 character, with whitespace in between. We skipped
1235 the whitespace earlier, so output it now. */
1245 /* This is a common case. Quickly copy CH and all the
1246 following symbol component or normal characters. */
1248 && mri_state == NULL
1249 #if defined TC_ARM && defined OBJ_ELF
1250 && symver_state == NULL
1257 for (s = from; s < fromend; s++)
1261 ch2 = *(unsigned char *) s;
1264 && type != LEX_IS_SYMBOL_COMPONENT)
1269 /* Handle the last character normally, for
1275 if (len > (toend - to) - 1)
1276 len = (toend - to) - 1;
1283 memcpy (to, from, len);
1291 case 8: *to++ = *from++;
1292 case 7: *to++ = *from++;
1293 case 6: *to++ = *from++;
1294 case 5: *to++ = *from++;
1295 case 4: *to++ = *from++;
1296 case 3: *to++ = *from++;
1297 case 2: *to++ = *from++;
1298 case 1: *to++ = *from++;
1308 /* Some relatively `normal' character. */
1311 state = 11; /* Now seeing label definition. */
1313 else if (state == 1)
1315 state = 2; /* Ditto. */
1317 else if (state == 9)
1319 if (!IS_SYMBOL_COMPONENT (ch))
1322 else if (state == 10)
1326 /* Special handling for backslash: a backslash may
1327 be the beginning of a formal parameter (of a
1328 macro) following another symbol character, with
1329 whitespace in between. If that is the case, we
1330 output a space before the parameter. Strictly
1331 speaking, correct handling depends upon what the
1332 macro parameter expands into; if the parameter
1333 expands into something which does not start with
1334 an operand character, then we don't want to keep
1335 the space. We don't have enough information to
1336 make the right choice, so here we are making the
1337 choice which is more likely to be correct. */
1351 /* We have reached the end of the input. */
1352 return to - tostart;
1355 /* The output buffer is full. Save any input we have not yet
1360 saved_input_len = fromend - from;
1365 return to - tostart;