]>
git.ipfire.org Git - thirdparty/gcc.git/blob - gcc/cppexp.c
1 /* Parse C expressions for CCCP.
2 Copyright (C) 1987, 1992, 1994, 1995, 1997, 1998 Free Software Foundation.
4 This program is free software; you can redistribute it and/or modify it
5 under the terms of the GNU General Public License as published by the
6 Free Software Foundation; either version 2, or (at your option) any
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA.
19 In other words, you are welcome to use, share and improve this program.
20 You are forbidden to forbid anyone else to use, share and improve
21 what you give them. Help stamp out software-hoarding!
23 Written by Per Bothner 1994. */
25 /* Parse a C expression from text in a string */
29 #include "gansidecl.h"
32 extern char *xmalloc
PARAMS ((unsigned));
33 extern char *xrealloc
PARAMS ((void *, unsigned));
35 #ifdef MULTIBYTE_CHARS
39 /* This is used for communicating lists of keywords with cccp.c. */
47 #ifndef CHAR_TYPE_SIZE
48 #define CHAR_TYPE_SIZE BITS_PER_UNIT
52 #define INT_TYPE_SIZE BITS_PER_WORD
55 #ifndef LONG_TYPE_SIZE
56 #define LONG_TYPE_SIZE BITS_PER_WORD
59 #ifndef WCHAR_TYPE_SIZE
60 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
63 #ifndef MAX_CHAR_TYPE_SIZE
64 #define MAX_CHAR_TYPE_SIZE CHAR_TYPE_SIZE
67 #ifndef MAX_INT_TYPE_SIZE
68 #define MAX_INT_TYPE_SIZE INT_TYPE_SIZE
71 #ifndef MAX_LONG_TYPE_SIZE
72 #define MAX_LONG_TYPE_SIZE LONG_TYPE_SIZE
75 #ifndef MAX_WCHAR_TYPE_SIZE
76 #define MAX_WCHAR_TYPE_SIZE WCHAR_TYPE_SIZE
79 /* Yield nonzero if adding two numbers with A's and B's signs can yield a
80 number with SUM's sign, where A, B, and SUM are all C integers. */
81 #define possible_sum_sign(a, b, sum) ((((a) ^ (b)) | ~ ((a) ^ (sum))) < 0)
83 static void integer_overflow
PARAMS ((cpp_reader
*));
84 static long left_shift
PARAMS ((cpp_reader
*, long, int, unsigned long));
85 static long right_shift
PARAMS ((cpp_reader
*, long, int, unsigned long));
100 #define LEFT_OPERAND_REQUIRED 1
101 #define RIGHT_OPERAND_REQUIRED 2
103 /* SKIP_OPERAND is set for '&&' '||' '?' and ':' when the
104 following operand should be short-circuited instead of evaluated. */
105 #define SKIP_OPERAND 8
106 /*#define UNSIGNEDP 16*/
108 /* Find the largest host integer type and set its size and type.
109 Watch out: on some crazy hosts `long' is shorter than `int'. */
111 #ifndef HOST_WIDE_INT
113 # include <inttypes.h>
114 # define HOST_WIDE_INT intmax_t
116 # if (HOST_BITS_PER_LONG <= HOST_BITS_PER_INT \
117 && HOST_BITS_PER_LONGLONG <= HOST_BITS_PER_INT)
118 # define HOST_WIDE_INT int
120 # if (HOST_BITS_PER_LONGLONG <= HOST_BITS_PER_LONG \
121 || ! (defined LONG_LONG_MAX || defined LLONG_MAX))
122 # define HOST_WIDE_INT long
124 # define HOST_WIDE_INT long long
134 #ifndef HOST_BITS_PER_WIDE_INT
135 #define HOST_BITS_PER_WIDE_INT (CHAR_BIT * sizeof (HOST_WIDE_INT))
140 char rprio
; /* Priority of op (relative to it right operand). */
142 char unsignedp
; /* true if value should be treated as unsigned */
143 HOST_WIDE_INT value
; /* The value logically "right" of op. */
146 /* Take care of parsing a number (anything that starts with a digit).
147 LEN is the number of characters in it. */
149 /* maybe needs to actually deal with floating point numbers */
152 parse_number (pfile
, start
, olen
)
158 register char *p
= start
;
160 register unsigned long n
= 0, nd
, ULONG_MAX_over_base
;
161 register int base
= 10;
162 register int len
= olen
;
163 register int overflow
= 0;
164 register int digit
, largest_digit
= 0;
169 for (c
= 0; c
< len
; c
++)
171 /* It's a float since it contains a point. */
173 "floating point numbers not allowed in #if expressions");
178 if (len
>= 3 && (!strncmp (p
, "0x", 2) || !strncmp (p
, "0X", 2))) {
186 /* Some buggy compilers (e.g. MPW C) seem to need both casts. */
187 ULONG_MAX_over_base
= ((unsigned long) -1) / ((unsigned long) base
);
189 for (; len
> 0; len
--) {
192 if (c
>= '0' && c
<= '9')
194 else if (base
== 16 && c
>= 'a' && c
<= 'f')
195 digit
= c
- 'a' + 10;
196 else if (base
== 16 && c
>= 'A' && c
<= 'F')
197 digit
= c
- 'A' + 10;
199 /* `l' means long, and `u' means unsigned. */
201 if (c
== 'l' || c
== 'L')
204 cpp_error (pfile
, "two `l's in integer constant");
207 else if (c
== 'u' || c
== 'U')
210 cpp_error (pfile
, "two `u's in integer constant");
220 /* Don't look for any more digits after the suffixes. */
223 if (largest_digit
< digit
)
224 largest_digit
= digit
;
225 nd
= n
* base
+ digit
;
226 overflow
|= ULONG_MAX_over_base
< n
|| nd
< n
;
232 cpp_error (pfile
, "Invalid number in #if expression");
237 if (base
<= largest_digit
)
238 cpp_pedwarn (pfile
, "integer constant contains digits beyond the radix");
241 cpp_pedwarn (pfile
, "integer constant out of range");
243 /* If too big to be signed, consider it unsigned. */
244 if ((long) n
< 0 && ! op
.unsignedp
)
247 cpp_warning (pfile
, "integer constant is so large that it is unsigned");
261 static struct token tokentab2
[] = {
275 /* Read one token. */
278 cpp_lex (pfile
, skip_evaluation
)
283 register struct token
*toktab
;
284 enum cpp_token token
;
286 U_CHAR
*tok_start
, *tok_end
;
291 old_written
= CPP_WRITTEN (pfile
);
292 cpp_skip_hspace (pfile
);
293 c
= CPP_BUF_PEEK (CPP_BUFFER (pfile
));
295 return parse_number (pfile
,
296 cpp_read_check_assertion (pfile
) ? "1" : "0", 1);
304 token
= cpp_get_token (pfile
);
305 tok_start
= pfile
->token_buffer
+ old_written
;
306 tok_end
= CPP_PWRITTEN (pfile
);
307 pfile
->limit
= tok_start
;
310 case CPP_EOF
: /* Should not happen ... */
315 if (CPP_BUFFER (pfile
)->fname
!= NULL
)
320 cpp_pop_buffer (pfile
);
322 case CPP_HSPACE
: case CPP_COMMENT
:
325 return parse_number (pfile
, tok_start
, tok_end
- tok_start
);
327 cpp_error (pfile
, "string constants not allowed in #if expressions");
331 /* This code for reading a character constant
332 handles multicharacter constants and wide characters.
333 It is mostly copied from c-lex.c. */
335 register int result
= 0;
336 register int num_chars
= 0;
337 unsigned width
= MAX_CHAR_TYPE_SIZE
;
340 U_CHAR
*ptr
= tok_start
;
341 #ifdef MULTIBYTE_CHARS
342 char token_buffer
[MAX_LONG_TYPE_SIZE
/MAX_CHAR_TYPE_SIZE
+ MB_CUR_MAX
];
344 char token_buffer
[MAX_LONG_TYPE_SIZE
/MAX_CHAR_TYPE_SIZE
+ 1];
351 width
= MAX_WCHAR_TYPE_SIZE
;
352 #ifdef MULTIBYTE_CHARS
353 max_chars
= MB_CUR_MAX
;
359 max_chars
= MAX_LONG_TYPE_SIZE
/ width
;
362 while (ptr
< tok_end
&& ((c
= *ptr
++) != '\''))
366 c
= cpp_parse_escape (pfile
, (char **) &ptr
);
367 if (width
< HOST_BITS_PER_INT
368 && (unsigned) c
>= (1 << width
))
370 "escape sequence out of range for character");
375 /* Merge character into result; ignore excess chars. */
376 if (num_chars
< max_chars
+ 1)
378 if (width
< HOST_BITS_PER_INT
)
379 result
= (result
<< width
) | (c
& ((1 << width
) - 1));
382 token_buffer
[num_chars
- 1] = c
;
386 token_buffer
[num_chars
] = 0;
389 cpp_error (pfile
, "malformatted character constant");
390 else if (num_chars
== 0)
391 cpp_error (pfile
, "empty character constant");
392 else if (num_chars
> max_chars
)
394 num_chars
= max_chars
;
395 cpp_error (pfile
, "character constant too long");
397 else if (num_chars
!= 1 && ! CPP_TRADITIONAL (pfile
))
398 cpp_warning (pfile
, "multi-character character constant");
400 /* If char type is signed, sign-extend the constant. */
403 int num_bits
= num_chars
* width
;
405 if (cpp_lookup (pfile
, (U_CHAR
*)"__CHAR_UNSIGNED__",
406 sizeof ("__CHAR_UNSIGNED__")-1, -1)
407 || ((result
>> (num_bits
- 1)) & 1) == 0)
409 = result
& ((unsigned long) ~0 >> (HOST_BITS_PER_LONG
- num_bits
));
412 = result
| ~((unsigned long) ~0 >> (HOST_BITS_PER_LONG
- num_bits
));
416 #ifdef MULTIBYTE_CHARS
417 /* Set the initial shift state and convert the next sequence. */
419 /* In all locales L'\0' is zero and mbtowc will return zero,
422 || (num_chars
== 1 && token_buffer
[0] != '\0'))
425 (void) mbtowc (NULL_PTR
, NULL_PTR
, 0);
426 if (mbtowc (& wc
, token_buffer
, num_chars
) == num_chars
)
429 cpp_pedwarn (pfile
,"Ignoring invalid multibyte character");
436 /* This is always a signed type. */
443 if (CPP_WARN_UNDEF (pfile
) && !skip_evaluation
)
444 cpp_warning (pfile
, "`%.*s' is not defined",
445 (int) (tok_end
- tok_start
), tok_start
);
446 return parse_number (pfile
, "0", 0);
449 /* See if it is a special token of length 2. */
450 if (tok_start
+ 2 == tok_end
)
452 for (toktab
= tokentab2
; toktab
->operator != NULL
; toktab
++)
453 if (tok_start
[0] == toktab
->operator[0]
454 && tok_start
[1] == toktab
->operator[1])
456 if (toktab
->token
== ERROR
)
458 char *buf
= (char *) alloca (40);
459 sprintf (buf
, "`%s' not allowed in operand of `#if'", tok_start
);
460 cpp_error (pfile
, buf
);
462 op
.op
= toktab
->token
;
473 /* Parse a C escape sequence. STRING_PTR points to a variable
474 containing a pointer to the string to parse. That pointer
475 is updated past the characters we use. The value of the
476 escape sequence is returned.
478 A negative value means the sequence \ newline was seen,
479 which is supposed to be equivalent to nothing at all.
481 If \ is followed by a null character, we return a negative
482 value and leave the string pointer pointing at the null character.
484 If \ is followed by 000, we return 0 and leave the string pointer
485 after the zeros. A value of 0 does not mean end of string. */
488 cpp_parse_escape (pfile
, string_ptr
)
492 register int c
= *(*string_ptr
)++;
501 if (CPP_PEDANTIC (pfile
))
502 cpp_pedwarn (pfile
, "non-ANSI-standard escape sequence, `\\%c'", c
);
507 return TARGET_NEWLINE
;
529 register int i
= c
- '0';
530 register int count
= 0;
533 c
= *(*string_ptr
)++;
534 if (c
>= '0' && c
<= '7')
535 i
= (i
<< 3) + c
- '0';
542 if ((i
& ~((1 << MAX_CHAR_TYPE_SIZE
) - 1)) != 0)
544 i
&= (1 << MAX_CHAR_TYPE_SIZE
) - 1;
546 "octal character constant does not fit in a byte");
552 register unsigned i
= 0, overflow
= 0, digits_found
= 0, digit
;
555 c
= *(*string_ptr
)++;
556 if (c
>= '0' && c
<= '9')
558 else if (c
>= 'a' && c
<= 'f')
559 digit
= c
- 'a' + 10;
560 else if (c
>= 'A' && c
<= 'F')
561 digit
= c
- 'A' + 10;
567 overflow
|= i
^ (i
<< 4 >> 4);
568 i
= (i
<< 4) + digit
;
572 cpp_error (pfile
, "\\x used with no following hex digits");
573 if (overflow
| (i
& ~((1 << BITS_PER_UNIT
) - 1)))
575 i
&= (1 << BITS_PER_UNIT
) - 1;
577 "hex character constant does not fit in a byte");
587 integer_overflow (pfile
)
590 if (CPP_PEDANTIC (pfile
))
591 cpp_pedwarn (pfile
, "integer overflow in preprocessor expression");
595 left_shift (pfile
, a
, unsignedp
, b
)
601 if (b
>= HOST_BITS_PER_LONG
)
603 if (! unsignedp
&& a
!= 0)
604 integer_overflow (pfile
);
608 return (unsigned long) a
<< b
;
613 integer_overflow (pfile
);
619 right_shift (pfile
, a
, unsignedp
, b
)
620 cpp_reader
*pfile ATTRIBUTE_UNUSED
;
625 if (b
>= HOST_BITS_PER_LONG
)
626 return unsignedp
? 0 : a
>> (HOST_BITS_PER_LONG
- 1);
628 return (unsigned long) a
>> b
;
633 /* These priorities are all even, so we can handle associatively. */
634 #define PAREN_INNER_PRIO 0
636 #define COND_PRIO (COMMA_PRIO+2)
637 #define OROR_PRIO (COND_PRIO+2)
638 #define ANDAND_PRIO (OROR_PRIO+2)
639 #define OR_PRIO (ANDAND_PRIO+2)
640 #define XOR_PRIO (OR_PRIO+2)
641 #define AND_PRIO (XOR_PRIO+2)
642 #define EQUAL_PRIO (AND_PRIO+2)
643 #define LESS_PRIO (EQUAL_PRIO+2)
644 #define SHIFT_PRIO (LESS_PRIO+2)
645 #define PLUS_PRIO (SHIFT_PRIO+2)
646 #define MUL_PRIO (PLUS_PRIO+2)
647 #define UNARY_PRIO (MUL_PRIO+2)
648 #define PAREN_OUTER_PRIO (UNARY_PRIO+2)
650 #define COMPARE(OP) \
652 top->value = (unsigned1 || unsigned2) ? (unsigned long) v1 OP v2 : (v1 OP v2)
654 /* Parse and evaluate a C expression, reading from PFILE.
655 Returns the value of the expression. */
658 cpp_parse_expr (pfile
)
661 /* The implementation is an operator precedence parser,
662 i.e. a bottom-up parser, using a stack for not-yet-reduced tokens.
664 The stack base is 'stack', and the current stack pointer is 'top'.
665 There is a stack element for each operator (only),
666 and the most recently pushed operator is 'top->op'.
667 An operand (value) is stored in the 'value' field of the stack
668 element of the operator that precedes it.
669 In that case the 'flags' field has the HAVE_VALUE flag set. */
671 #define INIT_STACK_SIZE 20
672 struct operation init_stack
[INIT_STACK_SIZE
];
673 struct operation
*stack
= init_stack
;
674 struct operation
*limit
= stack
+ INIT_STACK_SIZE
;
675 register struct operation
*top
= stack
;
677 int skip_evaluation
= 0;
687 op
= cpp_lex (pfile
, skip_evaluation
);
689 /* See if the token is an operand, in which case go to set_value.
690 If the token is an operator, figure out its left and right
691 priorities, and then goto maybe_reduce. */
698 top
->value
= op
.value
;
699 top
->unsignedp
= op
.unsignedp
;
702 lprio
= 0; goto maybe_reduce
;
704 /* Is this correct if unary ? FIXME */
705 flags
= RIGHT_OPERAND_REQUIRED
;
706 lprio
= PLUS_PRIO
; rprio
= lprio
+ 1; goto maybe_reduce
;
708 flags
= RIGHT_OPERAND_REQUIRED
;
709 rprio
= UNARY_PRIO
; lprio
= rprio
+ 1; goto maybe_reduce
;
710 case '*': case '/': case '%':
711 lprio
= MUL_PRIO
; goto binop
;
712 case '<': case '>': case LEQ
: case GEQ
:
713 lprio
= LESS_PRIO
; goto binop
;
714 case EQUAL
: case NOTEQUAL
:
715 lprio
= EQUAL_PRIO
; goto binop
;
717 lprio
= SHIFT_PRIO
; goto binop
;
718 case '&': lprio
= AND_PRIO
; goto binop
;
719 case '^': lprio
= XOR_PRIO
; goto binop
;
720 case '|': lprio
= OR_PRIO
; goto binop
;
721 case ANDAND
: lprio
= ANDAND_PRIO
; goto binop
;
722 case OROR
: lprio
= OROR_PRIO
; goto binop
;
724 lprio
= COMMA_PRIO
; goto binop
;
726 lprio
= PAREN_OUTER_PRIO
; rprio
= PAREN_INNER_PRIO
;
729 lprio
= PAREN_INNER_PRIO
; rprio
= PAREN_OUTER_PRIO
;
732 lprio
= COND_PRIO
; rprio
= COND_PRIO
;
735 lprio
= COND_PRIO
+ 1; rprio
= COND_PRIO
;
738 flags
= LEFT_OPERAND_REQUIRED
|RIGHT_OPERAND_REQUIRED
;
742 cpp_error (pfile
, "invalid character in #if");
747 /* Push a value onto the stack. */
748 if (top
->flags
& HAVE_VALUE
)
750 cpp_error (pfile
, "syntax error in #if");
753 top
->flags
|= HAVE_VALUE
;
757 /* Push an operator, and check if we can reduce now. */
758 while (top
->rprio
> lprio
)
760 long v1
= top
[-1].value
, v2
= top
[0].value
;
761 int unsigned1
= top
[-1].unsignedp
, unsigned2
= top
[0].unsignedp
;
763 if ((top
[1].flags
& LEFT_OPERAND_REQUIRED
)
764 && ! (top
[0].flags
& HAVE_VALUE
))
766 cpp_error (pfile
, "syntax error - missing left operand");
769 if ((top
[1].flags
& RIGHT_OPERAND_REQUIRED
)
770 && ! (top
[1].flags
& HAVE_VALUE
))
772 cpp_error (pfile
, "syntax error - missing right operand");
775 /* top[0].value = (top[1].op)(v1, v2);*/
779 if (!(top
->flags
& HAVE_VALUE
))
782 top
->unsignedp
= unsigned2
;
783 top
->flags
|= HAVE_VALUE
;
787 top
->value
= v1
+ v2
;
788 top
->unsignedp
= unsigned1
|| unsigned2
;
789 if (! top
->unsignedp
&& ! skip_evaluation
790 && ! possible_sum_sign (v1
, v2
, top
->value
))
791 integer_overflow (pfile
);
795 if (!(top
->flags
& HAVE_VALUE
))
798 if (!skip_evaluation
&& (top
->value
& v2
) < 0 && !unsigned2
)
799 integer_overflow (pfile
);
800 top
->unsignedp
= unsigned2
;
801 top
->flags
|= HAVE_VALUE
;
805 top
->value
= v1
- v2
;
806 top
->unsignedp
= unsigned1
|| unsigned2
;
807 if (! top
->unsignedp
&& ! skip_evaluation
808 && ! possible_sum_sign (top
->value
, v2
, v1
))
809 integer_overflow (pfile
);
813 top
->unsignedp
= unsigned1
|| unsigned2
;
815 top
->value
= (unsigned long) v1
* v2
;
816 else if (!skip_evaluation
)
818 top
->value
= v1
* v2
;
820 && (top
->value
/ v1
!= v2
821 || (top
->value
& v1
& v2
) < 0))
822 integer_overflow (pfile
);
830 cpp_error (pfile
, "division by zero in #if");
833 top
->unsignedp
= unsigned1
|| unsigned2
;
835 top
->value
= (unsigned long) v1
/ v2
;
838 top
->value
= v1
/ v2
;
839 if ((top
->value
& v1
& v2
) < 0)
840 integer_overflow (pfile
);
848 cpp_error (pfile
, "division by zero in #if");
851 top
->unsignedp
= unsigned1
|| unsigned2
;
853 top
->value
= (unsigned long) v1
% v2
;
855 top
->value
= v1
% v2
;
858 if (top
->flags
& HAVE_VALUE
)
860 cpp_error (pfile
, "syntax error");
865 top
->flags
|= HAVE_VALUE
;
868 if (top
->flags
& HAVE_VALUE
)
870 cpp_error (pfile
, "syntax error");
874 top
->unsignedp
= unsigned2
;
875 top
->flags
|= HAVE_VALUE
;
877 case '<': COMPARE(<); break;
878 case '>': COMPARE(>); break;
879 case LEQ
: COMPARE(<=); break;
880 case GEQ
: COMPARE(>=); break;
882 top
->value
= (v1
== v2
);
886 top
->value
= (v1
!= v2
);
892 top
->unsignedp
= unsigned1
;
893 if (v2
< 0 && ! unsigned2
)
894 top
->value
= right_shift (pfile
, v1
, unsigned1
, -v2
);
896 top
->value
= left_shift (pfile
, v1
, unsigned1
, v2
);
901 top
->unsignedp
= unsigned1
;
902 if (v2
< 0 && ! unsigned2
)
903 top
->value
= left_shift (pfile
, v1
, unsigned1
, -v2
);
905 top
->value
= right_shift (pfile
, v1
, unsigned1
, v2
);
907 #define LOGICAL(OP) \
908 top->value = v1 OP v2;\
909 top->unsignedp = unsigned1 || unsigned2;
910 case '&': LOGICAL(&); break;
911 case '^': LOGICAL(^); break;
912 case '|': LOGICAL(|); break;
914 top
->value
= v1
&& v2
; top
->unsignedp
= 0;
915 if (!v1
) skip_evaluation
--;
918 top
->value
= v1
|| v2
; top
->unsignedp
= 0;
919 if (v1
) skip_evaluation
--;
922 if (CPP_PEDANTIC (pfile
))
923 cpp_pedwarn (pfile
, "comma operator in operand of `#if'");
925 top
->unsignedp
= unsigned2
;
928 cpp_error (pfile
, "syntax error in #if");
931 if (top
[0].op
!= '?')
934 "syntax error ':' without preceding '?'");
937 else if (! (top
[1].flags
& HAVE_VALUE
)
938 || !(top
[-1].flags
& HAVE_VALUE
)
939 || !(top
[0].flags
& HAVE_VALUE
))
941 cpp_error (pfile
, "bad syntax for ?: operator");
947 if (top
->value
) skip_evaluation
--;
948 top
->value
= top
->value
? v1
: v2
;
949 top
->unsignedp
= unsigned1
|| unsigned2
;
953 if ((top
[1].flags
& HAVE_VALUE
)
954 || ! (top
[0].flags
& HAVE_VALUE
)
956 || (top
[-1].flags
& HAVE_VALUE
))
958 cpp_error (pfile
, "mismatched parentheses in #if");
965 top
->unsignedp
= unsigned1
;
966 top
->flags
|= HAVE_VALUE
;
971 top
[1].op
>= ' ' && top
[1].op
<= '~'
972 ? "unimplemented operator '%c'\n"
973 : "unimplemented operator '\\%03o'\n",
980 cpp_error (pfile
, "internal error in #if expression");
981 if (stack
!= init_stack
)
987 /* Check for and handle stack overflow. */
990 struct operation
*new_stack
;
991 int old_size
= (char *) limit
- (char *) stack
;
992 int new_size
= 2 * old_size
;
993 if (stack
!= init_stack
)
994 new_stack
= (struct operation
*) xrealloc (stack
, new_size
);
997 new_stack
= (struct operation
*) xmalloc (new_size
);
998 bcopy ((char *) stack
, (char *) new_stack
, old_size
);
1001 top
= (struct operation
*) ((char *) new_stack
+ old_size
);
1002 limit
= (struct operation
*) ((char *) new_stack
+ new_size
);
1008 if ((op
.op
== OROR
&& top
[-1].value
)
1009 || (op
.op
== ANDAND
&& !top
[-1].value
)
1010 || (op
.op
== '?' && !top
[-1].value
))
1014 else if (op
.op
== ':')
1016 if (top
[-2].value
) /* Was condition true? */
1023 if (stack
!= init_stack
)
1025 skip_rest_of_line (pfile
);