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/* Scheme/Guile language support routines for GDB, the GNU debugger.
   Copyright 1995 Free Software Foundation, Inc.
 
   This file is part of GDB.
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
 
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
 
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */
 
#include "defs.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "expression.h"
#include "parser-defs.h"
#include "language.h"
#include "value.h"
#include "c-lang.h"
#include "scm-lang.h"
#include "scm-tags.h"
 
#define USE_EXPRSTRING 0
 
static void scm_lreadparen PARAMS ((int));
static int scm_skip_ws PARAMS ((void));
static void scm_read_token PARAMS ((int, int));
static LONGEST scm_istring2number PARAMS ((char *, int, int));
static LONGEST scm_istr2int PARAMS ((char *, int, int));
static void scm_lreadr PARAMS ((int));
 
static LONGEST
scm_istr2int (str, len, radix)
     char *str;
     int len;
     int radix;
{
  int i = 0;
  LONGEST inum = 0;
  int c;
  int sign = 0;
 
  if (0 >= len)
    return SCM_BOOL_F;          /* zero scm_length */
  switch (str[0])
    {                           /* leading sign */
    case '-':
    case '+':
      sign = str[0];
      if (++i == len)
        return SCM_BOOL_F;      /* bad if lone `+' or `-' */
    }
  do
    {
      switch (c = str[i++])
        {
        case '0':
        case '1':
        case '2':
        case '3':
        case '4':
        case '5':
        case '6':
        case '7':
        case '8':
        case '9':
          c = c - '0';
          goto accumulate;
        case 'A':
        case 'B':
        case 'C':
        case 'D':
        case 'E':
        case 'F':
          c = c - 'A' + 10;
          goto accumulate;
        case 'a':
        case 'b':
        case 'c':
        case 'd':
        case 'e':
        case 'f':
          c = c - 'a' + 10;
        accumulate:
          if (c >= radix)
            return SCM_BOOL_F;  /* bad digit for radix */
          inum *= radix;
          inum += c;
          break;
        default:
          return SCM_BOOL_F;    /* not a digit */
        }
    }
  while (i < len);
  if (sign == '-')
    inum = -inum;
  return SCM_MAKINUM (inum);
}
 
static LONGEST
scm_istring2number (str, len, radix)
     char *str;
     int len;
     int radix;
{
  int i = 0;
  char ex = 0;
  char ex_p = 0, rx_p = 0;        /* Only allow 1 exactness and 1 radix prefix */
#if 0
  SCM res;
#endif
  if (len == 1)
    if (*str == '+' || *str == '-')     /* Catches lone `+' and `-' for speed */
      return SCM_BOOL_F;
 
  while ((len - i) >= 2 && str[i] == '#' && ++i)
    switch (str[i++])
      {
      case 'b':
      case 'B':
        if (rx_p++)
          return SCM_BOOL_F;
        radix = 2;
        break;
      case 'o':
      case 'O':
        if (rx_p++)
          return SCM_BOOL_F;
        radix = 8;
        break;
      case 'd':
      case 'D':
        if (rx_p++)
          return SCM_BOOL_F;
        radix = 10;
        break;
      case 'x':
      case 'X':
        if (rx_p++)
          return SCM_BOOL_F;
        radix = 16;
        break;
      case 'i':
      case 'I':
        if (ex_p++)
          return SCM_BOOL_F;
        ex = 2;
        break;
      case 'e':
      case 'E':
        if (ex_p++)
          return SCM_BOOL_F;
        ex = 1;
        break;
      default:
        return SCM_BOOL_F;
      }
 
  switch (ex)
    {
    case 1:
      return scm_istr2int (&str[i], len - i, radix);
    case 0:
      return scm_istr2int (&str[i], len - i, radix);
#if 0
      if NFALSEP
        (res) return res;
#ifdef FLOATS
    case 2:
      return scm_istr2flo (&str[i], len - i, radix);
#endif
#endif
    }
  return SCM_BOOL_F;
}
 
static void
scm_read_token (c, weird)
     int c;
     int weird;
{
  while (1)
    {
      c = *lexptr++;
      switch (c)
        {
        case '[':
        case ']':
        case '(':
        case ')':
        case '\"':
        case ';':
        case ' ':
        case '\t':
        case '\r':
        case '\f':
        case '\n':
          if (weird)
            goto default_case;
        case '\0':              /* End of line */
        eof_case:
          --lexptr;
          return;
        case '\\':
          if (!weird)
            goto default_case;
          else
            {
              c = *lexptr++;
              if (c == '\0')
                goto eof_case;
              else
                goto default_case;
            }
        case '}':
          if (!weird)
            goto default_case;
 
          c = *lexptr++;
          if (c == '#')
            return;
          else
            {
              --lexptr;
              c = '}';
              goto default_case;
            }
 
        default:
        default_case:
          ;
        }
    }
}
 
static int
scm_skip_ws ()
{
  register int c;
  while (1)
    switch ((c = *lexptr++))
      {
      case '\0':
      goteof:
        return c;
      case ';':
      lp:
        switch ((c = *lexptr++))
          {
          case '\0':
            goto goteof;
          default:
            goto lp;
          case '\n':
            break;
          }
      case ' ':
      case '\t':
      case '\r':
      case '\f':
      case '\n':
        break;
      default:
        return c;
      }
}
 
static void
scm_lreadparen (skipping)
     int skipping;
{
  for (;;)
    {
      int c = scm_skip_ws ();
      if (')' == c || ']' == c)
        return;
      --lexptr;
      if (c == '\0')
        error ("missing close paren");
      scm_lreadr (skipping);
    }
}
 
static void
scm_lreadr (skipping)
     int skipping;
{
  int c, j;
  struct stoken str;
  LONGEST svalue = 0;
tryagain:
  c = *lexptr++;
  switch (c)
    {
    case '\0':
      lexptr--;
      return;
    case '[':
    case '(':
      scm_lreadparen (skipping);
      return;
    case ']':
    case ')':
      error ("unexpected #\\%c", c);
      goto tryagain;
    case '\'':
    case '`':
      str.ptr = lexptr - 1;
      scm_lreadr (skipping);
      if (!skipping)
        {
          value_ptr val = scm_evaluate_string (str.ptr, lexptr - str.ptr);
          if (!is_scmvalue_type (VALUE_TYPE (val)))
            error ("quoted scm form yields non-SCM value");
          svalue = extract_signed_integer (VALUE_CONTENTS (val),
                                           TYPE_LENGTH (VALUE_TYPE (val)));
          goto handle_immediate;
        }
      return;
    case ',':
      c = *lexptr++;
      if ('@' != c)
        lexptr--;
      scm_lreadr (skipping);
      return;
    case '#':
      c = *lexptr++;
      switch (c)
        {
        case '[':
        case '(':
          scm_lreadparen (skipping);
          return;
        case 't':
        case 'T':
          svalue = SCM_BOOL_T;
          goto handle_immediate;
        case 'f':
        case 'F':
          svalue = SCM_BOOL_F;
          goto handle_immediate;
        case 'b':
        case 'B':
        case 'o':
        case 'O':
        case 'd':
        case 'D':
        case 'x':
        case 'X':
        case 'i':
        case 'I':
        case 'e':
        case 'E':
          lexptr--;
          c = '#';
          goto num;
        case '*':               /* bitvector */
          scm_read_token (c, 0);
          return;
        case '{':
          scm_read_token (c, 1);
          return;
        case '\\':              /* character */
          c = *lexptr++;
          scm_read_token (c, 0);
          return;
        case '|':
          j = 1;                /* here j is the comment nesting depth */
        lp:
          c = *lexptr++;
        lpc:
          switch (c)
            {
            case '\0':
              error ("unbalanced comment");
            default:
              goto lp;
            case '|':
              if ('#' != (c = *lexptr++))
                goto lpc;
              if (--j)
                goto lp;
              break;
            case '#':
              if ('|' != (c = *lexptr++))
                goto lpc;
              ++j;
              goto lp;
            }
          goto tryagain;
        case '.':
        default:
#if 0
        callshrp:
#endif
          scm_lreadr (skipping);
          return;
        }
    case '\"':
      while ('\"' != (c = *lexptr++))
        {
          if (c == '\\')
            switch (c = *lexptr++)
              {
              case '\0':
                error ("non-terminated string literal");
              case '\n':
                continue;
              case '0':
              case 'f':
              case 'n':
              case 'r':
              case 't':
              case 'a':
              case 'v':
                break;
              }
        }
      return;
    case '0':
    case '1':
    case '2':
    case '3':
    case '4':
    case '5':
    case '6':
    case '7':
    case '8':
    case '9':
    case '.':
    case '-':
    case '+':
    num:
      {
        str.ptr = lexptr - 1;
        scm_read_token (c, 0);
        if (!skipping)
          {
            svalue = scm_istring2number (str.ptr, lexptr - str.ptr, 10);
            if (svalue != SCM_BOOL_F)
              goto handle_immediate;
            goto tok;
          }
      }
      return;
    case ':':
      scm_read_token ('-', 0);
      return;
#if 0
    do_symbol:
#endif
    default:
      str.ptr = lexptr - 1;
      scm_read_token (c, 0);
    tok:
      if (!skipping)
        {
          str.length = lexptr - str.ptr;
          if (str.ptr[0] == '$')
            {
              write_dollar_variable (str);
              return;
            }
          write_exp_elt_opcode (OP_NAME);
          write_exp_string (str);
          write_exp_elt_opcode (OP_NAME);
        }
      return;
    }
handle_immediate:
  if (!skipping)
    {
      write_exp_elt_opcode (OP_LONG);
      write_exp_elt_type (builtin_type_scm);
      write_exp_elt_longcst (svalue);
      write_exp_elt_opcode (OP_LONG);
    }
}
 
int
scm_parse ()
{
  char *start;
  while (*lexptr == ' ')
    lexptr++;
  start = lexptr;
  scm_lreadr (USE_EXPRSTRING);
#if USE_EXPRSTRING
  str.length = lexptr - start;
  str.ptr = start;
  write_exp_elt_opcode (OP_EXPRSTRING);
  write_exp_string (str);
  write_exp_elt_opcode (OP_EXPRSTRING);
#endif
  return 0;
}

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[/] [or1k/] [trunk/] [gdb-5.0/] [gdb/] [scm-exp.c] - Blame information for rev 1774

Line No.	Rev	Author	Line
1	104	markom	`/* Scheme/Guile language support routines for GDB, the GNU debugger.`
2			`Copyright 1995 Free Software Foundation, Inc.`
3
4			`This file is part of GDB.`
5
6			`This program is free software; you can redistribute it and/or modify`
7			`it under the terms of the GNU General Public License as published by`
8			`the Free Software Foundation; either version 2 of the License, or`
9			`(at your option) any later version.`
10
11			`This program is distributed in the hope that it will be useful,`
12			`but WITHOUT ANY WARRANTY; without even the implied warranty of`
13			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
14			`GNU General Public License for more details.`
15
16			`You should have received a copy of the GNU General Public License`
17			`along with this program; if not, write to the Free Software`
18			`Foundation, Inc., 59 Temple Place - Suite 330,`
19			`Boston, MA 02111-1307, USA. */`
20
21			`#include "defs.h"`
22			`#include "symtab.h"`
23			`#include "gdbtypes.h"`
24			`#include "expression.h"`
25			`#include "parser-defs.h"`
26			`#include "language.h"`
27			`#include "value.h"`
28			`#include "c-lang.h"`
29			`#include "scm-lang.h"`
30			`#include "scm-tags.h"`
31
32			`#define USE_EXPRSTRING 0`
33
34			`static void scm_lreadparen PARAMS ((int));`
35			`static int scm_skip_ws PARAMS ((void));`
36			`static void scm_read_token PARAMS ((int, int));`
37			`static LONGEST scm_istring2number PARAMS ((char *, int, int));`
38			`static LONGEST scm_istr2int PARAMS ((char *, int, int));`
39			`static void scm_lreadr PARAMS ((int));`
40
41			`static LONGEST`
42			`scm_istr2int (str, len, radix)`
43			`char *str;`
44			`int len;`
45			`int radix;`
46			`{`
47			`int i = 0;`
48			`LONGEST inum = 0;`
49			`int c;`
50			`int sign = 0;`
51
52			`if (0 >= len)`
53			`return SCM_BOOL_F; /* zero scm_length */`
54			`switch (str[0])`
55			`{ /* leading sign */`
56			`case '-':`
57			`case '+':`
58			`sign = str[0];`
59			`if (++i == len)`
60			return SCM_BOOL_F; /* bad if lone `+' or `-' */
61			`}`
62			`do`
63			`{`
64			`switch (c = str[i++])`
65			`{`
66			`case '0':`
67			`case '1':`
68			`case '2':`
69			`case '3':`
70			`case '4':`
71			`case '5':`
72			`case '6':`
73			`case '7':`
74			`case '8':`
75			`case '9':`
76			`c = c - '0';`
77			`goto accumulate;`
78			`case 'A':`
79			`case 'B':`
80			`case 'C':`
81			`case 'D':`
82			`case 'E':`
83			`case 'F':`
84			`c = c - 'A' + 10;`
85			`goto accumulate;`
86			`case 'a':`
87			`case 'b':`
88			`case 'c':`
89			`case 'd':`
90			`case 'e':`
91			`case 'f':`
92			`c = c - 'a' + 10;`
93			`accumulate:`
94			`if (c >= radix)`
95			`return SCM_BOOL_F; /* bad digit for radix */`
96			`inum *= radix;`
97			`inum += c;`
98			`break;`
99			`default:`
100			`return SCM_BOOL_F; /* not a digit */`
101			`}`
102			`}`
103			`while (i < len);`
104			`if (sign == '-')`
105			`inum = -inum;`
106			`return SCM_MAKINUM (inum);`
107			`}`
108
109			`static LONGEST`
110			`scm_istring2number (str, len, radix)`
111			`char *str;`
112			`int len;`
113			`int radix;`
114			`{`
115			`int i = 0;`
116			`char ex = 0;`
117			`char ex_p = 0, rx_p = 0; /* Only allow 1 exactness and 1 radix prefix */`
118			`#if 0`
119			`SCM res;`
120			`#endif`
121			`if (len == 1)`
122			if (str == '+' \|\| str == '-') /* Catches lone `+' and `-' for speed */
123			`return SCM_BOOL_F;`
124
125			`while ((len - i) >= 2 && str[i] == '#' && ++i)`
126			`switch (str[i++])`
127			`{`
128			`case 'b':`
129			`case 'B':`
130			`if (rx_p++)`
131			`return SCM_BOOL_F;`
132			`radix = 2;`
133			`break;`
134			`case 'o':`
135			`case 'O':`
136			`if (rx_p++)`
137			`return SCM_BOOL_F;`
138			`radix = 8;`
139			`break;`
140			`case 'd':`
141			`case 'D':`
142			`if (rx_p++)`
143			`return SCM_BOOL_F;`
144			`radix = 10;`
145			`break;`
146			`case 'x':`
147			`case 'X':`
148			`if (rx_p++)`
149			`return SCM_BOOL_F;`
150			`radix = 16;`
151			`break;`
152			`case 'i':`
153			`case 'I':`
154			`if (ex_p++)`
155			`return SCM_BOOL_F;`
156			`ex = 2;`
157			`break;`
158			`case 'e':`
159			`case 'E':`
160			`if (ex_p++)`
161			`return SCM_BOOL_F;`
162			`ex = 1;`
163			`break;`
164			`default:`
165			`return SCM_BOOL_F;`
166			`}`
167
168			`switch (ex)`
169			`{`
170			`case 1:`
171			`return scm_istr2int (&str[i], len - i, radix);`
172			`case 0:`
173			`return scm_istr2int (&str[i], len - i, radix);`
174			`#if 0`
175			`if NFALSEP`
176			`(res) return res;`
177			`#ifdef FLOATS`
178			`case 2:`
179			`return scm_istr2flo (&str[i], len - i, radix);`
180			`#endif`
181			`#endif`
182			`}`
183			`return SCM_BOOL_F;`
184			`}`
185
186			`static void`
187			`scm_read_token (c, weird)`
188			`int c;`
189			`int weird;`
190			`{`
191			`while (1)`
192			`{`
193			`c = *lexptr++;`
194			`switch (c)`
195			`{`
196			`case '[':`
197			`case ']':`
198			`case '(':`
199			`case ')':`
200			`case '\"':`
201			`case ';':`
202			`case ' ':`
203			`case '\t':`
204			`case '\r':`
205			`case '\f':`
206			`case '\n':`
207			`if (weird)`
208			`goto default_case;`
209			`case '\0': /* End of line */`
210			`eof_case:`
211			`--lexptr;`
212			`return;`
213			`case '\\':`
214			`if (!weird)`
215			`goto default_case;`
216			`else`
217			`{`
218			`c = *lexptr++;`
219			`if (c == '\0')`
220			`goto eof_case;`
221			`else`
222			`goto default_case;`
223			`}`
224			`case '}':`
225			`if (!weird)`
226			`goto default_case;`
227
228			`c = *lexptr++;`
229			`if (c == '#')`
230			`return;`
231			`else`
232			`{`
233			`--lexptr;`
234			`c = '}';`
235			`goto default_case;`
236			`}`
237
238			`default:`
239			`default_case:`
240			`;`
241			`}`
242			`}`
243			`}`
244
245			`static int`
246			`scm_skip_ws ()`
247			`{`
248			`register int c;`
249			`while (1)`
250			`switch ((c = *lexptr++))`
251			`{`
252			`case '\0':`
253			`goteof:`
254			`return c;`
255			`case ';':`
256			`lp:`
257			`switch ((c = *lexptr++))`
258			`{`
259			`case '\0':`
260			`goto goteof;`
261			`default:`
262			`goto lp;`
263			`case '\n':`
264			`break;`
265			`}`
266			`case ' ':`
267			`case '\t':`
268			`case '\r':`
269			`case '\f':`
270			`case '\n':`
271			`break;`
272			`default:`
273			`return c;`
274			`}`
275			`}`
276
277			`static void`
278			`scm_lreadparen (skipping)`
279			`int skipping;`
280			`{`
281			`for (;;)`
282			`{`
283			`int c = scm_skip_ws ();`
284			`if (')' == c \|\| ']' == c)`
285			`return;`
286			`--lexptr;`
287			`if (c == '\0')`
288			`error ("missing close paren");`
289			`scm_lreadr (skipping);`
290			`}`
291			`}`
292
293			`static void`
294			`scm_lreadr (skipping)`
295			`int skipping;`
296			`{`
297			`int c, j;`
298			`struct stoken str;`
299			`LONGEST svalue = 0;`
300			`tryagain:`
301			`c = *lexptr++;`
302			`switch (c)`
303			`{`
304			`case '\0':`
305			`lexptr--;`
306			`return;`
307			`case '[':`
308			`case '(':`
309			`scm_lreadparen (skipping);`
310			`return;`
311			`case ']':`
312			`case ')':`
313			`error ("unexpected #\\%c", c);`
314			`goto tryagain;`
315			`case '\'':`
316			case '`':
317			`str.ptr = lexptr - 1;`
318			`scm_lreadr (skipping);`
319			`if (!skipping)`
320			`{`
321			`value_ptr val = scm_evaluate_string (str.ptr, lexptr - str.ptr);`
322			`if (!is_scmvalue_type (VALUE_TYPE (val)))`
323			`error ("quoted scm form yields non-SCM value");`
324			`svalue = extract_signed_integer (VALUE_CONTENTS (val),`
325			`TYPE_LENGTH (VALUE_TYPE (val)));`
326			`goto handle_immediate;`
327			`}`
328			`return;`
329			`case ',':`
330			`c = *lexptr++;`
331			`if ('@' != c)`
332			`lexptr--;`
333			`scm_lreadr (skipping);`
334			`return;`
335			`case '#':`
336			`c = *lexptr++;`
337			`switch (c)`
338			`{`
339			`case '[':`
340			`case '(':`
341			`scm_lreadparen (skipping);`
342			`return;`
343			`case 't':`
344			`case 'T':`
345			`svalue = SCM_BOOL_T;`
346			`goto handle_immediate;`
347			`case 'f':`
348			`case 'F':`
349			`svalue = SCM_BOOL_F;`
350			`goto handle_immediate;`
351			`case 'b':`
352			`case 'B':`
353			`case 'o':`
354			`case 'O':`
355			`case 'd':`
356			`case 'D':`
357			`case 'x':`
358			`case 'X':`
359			`case 'i':`
360			`case 'I':`
361			`case 'e':`
362			`case 'E':`
363			`lexptr--;`
364			`c = '#';`
365			`goto num;`
366			`case '': / bitvector */`
367			`scm_read_token (c, 0);`
368			`return;`
369			`case '{':`
370			`scm_read_token (c, 1);`
371			`return;`
372			`case '\\': /* character */`
373			`c = *lexptr++;`
374			`scm_read_token (c, 0);`
375			`return;`
376			`case '\|':`
377			`j = 1; /* here j is the comment nesting depth */`
378			`lp:`
379			`c = *lexptr++;`
380			`lpc:`
381			`switch (c)`
382			`{`
383			`case '\0':`
384			`error ("unbalanced comment");`
385			`default:`
386			`goto lp;`
387			`case '\|':`
388			`if ('#' != (c = *lexptr++))`
389			`goto lpc;`
390			`if (--j)`
391			`goto lp;`
392			`break;`
393			`case '#':`
394			`if ('\|' != (c = *lexptr++))`
395			`goto lpc;`
396			`++j;`
397			`goto lp;`
398			`}`
399			`goto tryagain;`
400			`case '.':`
401			`default:`
402			`#if 0`
403			`callshrp:`
404			`#endif`
405			`scm_lreadr (skipping);`
406			`return;`
407			`}`
408			`case '\"':`
409			`while ('\"' != (c = *lexptr++))`
410			`{`
411			`if (c == '\\')`
412			`switch (c = *lexptr++)`
413			`{`
414			`case '\0':`
415			`error ("non-terminated string literal");`
416			`case '\n':`
417			`continue;`
418			`case '0':`
419			`case 'f':`
420			`case 'n':`
421			`case 'r':`
422			`case 't':`
423			`case 'a':`
424			`case 'v':`
425			`break;`
426			`}`
427			`}`
428			`return;`
429			`case '0':`
430			`case '1':`
431			`case '2':`
432			`case '3':`
433			`case '4':`
434			`case '5':`
435			`case '6':`
436			`case '7':`
437			`case '8':`
438			`case '9':`
439			`case '.':`
440			`case '-':`
441			`case '+':`
442			`num:`
443			`{`
444			`str.ptr = lexptr - 1;`
445			`scm_read_token (c, 0);`
446			`if (!skipping)`
447			`{`
448			`svalue = scm_istring2number (str.ptr, lexptr - str.ptr, 10);`
449			`if (svalue != SCM_BOOL_F)`
450			`goto handle_immediate;`
451			`goto tok;`
452			`}`
453			`}`
454			`return;`
455			`case ':':`
456			`scm_read_token ('-', 0);`
457			`return;`
458			`#if 0`
459			`do_symbol:`
460			`#endif`
461			`default:`
462			`str.ptr = lexptr - 1;`
463			`scm_read_token (c, 0);`
464			`tok:`
465			`if (!skipping)`
466			`{`
467			`str.length = lexptr - str.ptr;`
468			`if (str.ptr[0] == '$')`
469			`{`
470			`write_dollar_variable (str);`
471			`return;`
472			`}`
473			`write_exp_elt_opcode (OP_NAME);`
474			`write_exp_string (str);`
475			`write_exp_elt_opcode (OP_NAME);`
476			`}`
477			`return;`
478			`}`
479			`handle_immediate:`
480			`if (!skipping)`
481			`{`
482			`write_exp_elt_opcode (OP_LONG);`
483			`write_exp_elt_type (builtin_type_scm);`
484			`write_exp_elt_longcst (svalue);`
485			`write_exp_elt_opcode (OP_LONG);`
486			`}`
487			`}`
488
489			`int`
490			`scm_parse ()`
491			`{`
492			`char *start;`
493			`while (*lexptr == ' ')`
494			`lexptr++;`
495			`start = lexptr;`
496			`scm_lreadr (USE_EXPRSTRING);`
497			`#if USE_EXPRSTRING`
498			`str.length = lexptr - start;`
499			`str.ptr = start;`
500			`write_exp_elt_opcode (OP_EXPRSTRING);`
501			`write_exp_string (str);`
502			`write_exp_elt_opcode (OP_EXPRSTRING);`
503			`#endif`
504			`return 0;`
505			`}`