2 ** Splint - annotation-assisted static program checker
3 ** Copyright (C) 1994-2002 University of Virginia,
4 ** Massachusetts Institute of Technology
6 ** This program is free software; you can redistribute it and/or modify it
7 ** under the terms of the GNU General Public License as published by the
8 ** Free Software Foundation; either version 2 of the License, or (at your
9 ** option) any later version.
11 ** This program is distributed in the hope that it will be useful, but
12 ** WITHOUT ANY WARRANTY; without even the implied warranty of
13 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 ** General Public License for more details.
16 ** The GNU General Public License is available from http://www.gnu.org/ or
17 ** the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
18 ** MA 02111-1307, USA.
20 ** For information on splint: splint@cs.virginia.edu
21 ** To report a bug: splint-bug@cs.virginia.edu
22 ** For more information: http://www.splint.org
27 /* Parse C expressions for CCCP.
28 Copyright (C) 1987, 1992, 1994, 1995, 1997 Free Software Foundation.
30 This program is free software; you can redistribute it and/or modify it
31 under the terms of the GNU General Public License as published by the
32 Free Software Foundation; either version 2, or (at your option) any
35 This program is distributed in the hope that it will be useful,
36 but WITHOUT ANY WARRANTY; without even the implied warranty of
37 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
38 GNU General Public License for more details.
40 You should have received a copy of the GNU General Public License
41 along with this program; if not, write to the Free Software
42 Foundation, 59 Temple Place - Suite 330,
43 Boston, MA 02111-1307, USA.
45 In other words, you are welcome to use, share and improve this program.
46 You are forbidden to forbid anyone else to use, share and improve
47 what you give them. Help stamp out software-hoarding!
49 Written by Per Bothner 1994. */
51 /* Parse a C expression from text in a string */
56 /*@+matchanyintegral@*/
59 # include "splintMacros.nf"
64 # include "cpperror.h"
66 /* Yield nonzero if adding two numbers with A's and B's signs can yield a
67 number with SUM's sign, where A, B, and SUM are all C integers. */
69 /*@function static bool possibleSumSign (sef int, int, int)
70 modifies nothing ; @*/
72 #define possibleSumSign(a, b, sum) ((((a) ^ (b)) | ~ ((a) ^ (sum))) < 0)
74 /* these are guesses! */
76 /*@constant int BITS_PER_UNIT = 8@*/
77 # define BITS_PER_UNIT 8
79 /*@constant size_t BITS_PER_CHAR@*/
80 # define BITS_PER_CHAR 8
82 /*@constant size_t BITS_PER_WORD@*/
83 # define BITS_PER_WORD 32
85 /*@constant size_t HOST_BITS_PER_INT@*/
86 # define HOST_BITS_PER_INT 32
88 /*@constant size_t HOST_BITS_PER_LONG = 32@*/
89 # define HOST_BITS_PER_LONG 32
91 /*@constant char TARGET_BELL@*/
92 # define TARGET_BELL (char) 6
94 /*@constant char TARGET_BS@*/
95 # define TARGET_BS (char) 7
97 /*@constant char TARGET_FF@*/
98 # define TARGET_FF (char) 8
100 /*@constant char TARGET_NEWLINE@*/
101 # define TARGET_NEWLINE '\n'
103 /*@constant char TARGET_CR@*/
104 # define TARGET_CR '\n'
106 /*@constant char TARGET_TAB@*/
107 # define TARGET_TAB '\t'
109 /*@constant char TARGET_VT@*/
110 # define TARGET_VT '\v'
112 #ifdef MULTIBYTE_CHARS
119 #ifndef INT_TYPE_SIZE
120 /*@constant size_t INT_TYPE_SIZE@*/
121 #define INT_TYPE_SIZE BITS_PER_WORD
124 #ifndef LONG_TYPE_SIZE
125 /*@constant size_t LONG_TYPE_SIZE@*/
126 #define LONG_TYPE_SIZE BITS_PER_WORD
129 #ifndef WCHAR_TYPE_SIZE
130 /*@constant size_t WCHAR_TYPE_SIZE@*/
131 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
134 # ifndef CHAR_TYPE_SIZE
135 /*@constant size_t CHAR_TYPE_SIZE@*/
136 # define CHAR_TYPE_SIZE BITS_PER_CHAR
139 #ifndef MAX_CHAR_TYPE_SIZE
140 /*@constant size_t MAX_CHAR_TYPE_SIZE@*/
141 #define MAX_CHAR_TYPE_SIZE CHAR_TYPE_SIZE
144 #ifndef MAX_LONG_TYPE_SIZE
145 /*@constant size_t MAX_LONG_TYPE_SIZE@*/
146 #define MAX_LONG_TYPE_SIZE LONG_TYPE_SIZE
149 #ifndef MAX_WCHAR_TYPE_SIZE
150 /*@constant size_t MAX_WCHAR_TYPE_SIZE@*/
151 #define MAX_WCHAR_TYPE_SIZE WCHAR_TYPE_SIZE
154 static struct operation cppexp_lex (cppReader *);
155 static void integer_overflow (cppReader *);
156 static long left_shift (cppReader *, long, bool p_unsignedp, size_t);
157 static long right_shift (long, bool p_unsignedp, unsigned long);
159 /*@constant short CPPREADER_ERRORTOK@*/
160 #define CPPREADER_ERRORTOK 299
162 /*@constant int OROR@*/
165 /*@constant int ANDAND@*/
168 /*@constant int CPP_EQUALTOK@*/
169 #define CPP_EQUALTOK 302
171 /*@constant int NOTEQUAL@*/
174 /*@constant int LEQ@*/
177 /*@constant int GEQ@*/
180 /*@constant int LSH@*/
183 /*@constant int RSH@*/
186 /*@constant int NAME@*/
189 /*@constant short CPPEXP_INT@*/
190 #define CPPEXP_INT 309
192 /*@constant short CPPEXP_CHAR@*/
193 #define CPPEXP_CHAR 310
195 /*@constant int LEFT_OPERAND_REQUIRED@*/
196 #define LEFT_OPERAND_REQUIRED 1
198 /*@constant int RIGHT_OPERAND_REQUIRED@*/
199 #define RIGHT_OPERAND_REQUIRED 2
201 /*@constant int HAVE_VALUE@*/
204 #ifndef HOST_BITS_PER_WIDE_INT
206 #if HOST_BITS_PER_LONG > HOST_BITS_PER_INT
207 /*@constant int HOST_BITS_PER_WIDE_INT@*/
208 #define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_LONG
210 #define HOST_WIDE_INT long
212 /*@constant int HOST_BITS_PER_WIDE_INT@*/
213 #define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_INT
215 #define HOST_WIDE_INT long
223 /* Priority of op (relative to it right operand). */
224 /*@reldef@*/ char rprio;
226 /*@reldef@*/ char flags;
228 /* true if value should be treated as unsigned */
229 /*@reldef@*/ bool unsignedp;
231 /* The value logically "right" of op. */
232 /*@reldef@*/ HOST_WIDE_INT value;
235 /* Take care of parsing a number (anything that starts with a digit).
236 LEN is the number of characters in it. */
238 /* maybe needs to actually deal with floating point numbers */
241 cppReader_parseNumber (cppReader *pfile, char *start, int olen) /*@requires maxRead(start) >= (olen - 1) @*/
248 unsigned long nd, ULONG_MAX_over_base;
251 bool overflow = FALSE;
252 int digit, largest_digit = 0;
253 bool spec_long = FALSE;
255 op.unsignedp = FALSE;
257 for (i = 0; i < len; i++)
259 /*drl bee: is*/ if (p[i] == '.') {
260 /* It's a float since it contains a point. */
263 cstring_makeLiteralTemp
264 ("Floating point numbers not allowed in #if expressions"));
265 op.op = CPPREADER_ERRORTOK;
270 if (len >= 3 && (mstring_equalPrefix (p, "0x")
271 || mstring_equalPrefix (p, "0X")))
280 /* drl: see if there is a reason that we shouldn't do
291 /* Some buggy compilers (e.g. MPW C) seem to need both casts. */
292 ULONG_MAX_over_base = ((unsigned long) -1) / ((unsigned long) base);
294 for (; len > 0; len--) {
297 if (c >= '0' && c <= '9')
299 digit = (int) (c - '0');
301 else if (base == 16 && c >= 'a' && c <= 'f')
303 digit = (int) (c - 'a') + 10;
305 else if (base == 16 && c >= 'A' && c <= 'F')
307 digit = (int) (c - 'A') + 10;
311 /* `l' means long, and `u' means unsigned. */
314 if (c == 'l' || c == 'L')
317 cppReader_errorLit (pfile,
318 cstring_makeLiteralTemp ("two `l's in integer constant"));
321 else if (c == 'u' || c == 'U')
324 cppReader_errorLit (pfile,
325 cstring_makeLiteralTemp ("two `u's in integer constant"));
330 /*@innerbreak@*/ break;
335 /*@innerbreak@*/ break;
338 /*drl bee: ltc*/ c = *p++;
340 /* Don't look for any more digits after the suffixes. */
344 if (largest_digit < digit)
346 largest_digit = digit;
349 nd = (long unsigned) (n * base + digit);
350 overflow |= (ULONG_MAX_over_base < (unsigned long) n)
351 | (nd < (unsigned long) n);
359 cstring_makeLiteralTemp ("Invalid number in #if expression"));
360 op.op = CPPREADER_ERRORTOK;
364 if (base <= largest_digit)
368 cstring_makeLiteralTemp
369 ("Integer constant contains digits beyond the radix"));
374 /*@i23 add flags for all these...*/
377 cstring_makeLiteralTemp ("Integer constant out of range"));
380 /* If too big to be signed, consider it unsigned. */
381 if ((long) n < 0 && ! op.unsignedp)
387 cstring_makeLiteralTemp ("Integer constant is so large that it is unsigned"));
395 DPRINTF (("Parse number: %d", op.value));
400 /*@null@*/ /*@observer@*/ char *operator;
404 static struct token tokentab2[] = {
409 { "==", CPP_EQUALTOK },
413 { "++", CPPREADER_ERRORTOK },
414 { "--", CPPREADER_ERRORTOK },
415 { NULL, CPPREADER_ERRORTOK }
418 /* Read one token. */
420 struct operation cppexp_lex (cppReader *pfile)
424 register struct token *toktab;
425 enum cpp_token token;
427 char *tok_start, *tok_end;
432 old_written = size_toInt (cpplib_getWritten (pfile));
433 cppSkipHspace (pfile);
434 ic = cpplib_bufPeek (cppReader_getBufferSafe (pfile));
438 DPRINTF (("Read: %c", c));
446 token = cpplib_getTokenForceExpand (pfile);
448 tok_start = pfile->token_buffer + old_written;
449 tok_end = cpplib_getPWritten (pfile);
451 DPRINTF (("Token: %s < %s", tok_start, tok_end));
453 pfile->limit = tok_start;
457 case CPP_EOF: /* Should not happen ... */
462 if (cstring_isDefined (cppReader_getBufferSafe (pfile)->fname))
467 (void) cppReader_popBuffer (pfile);
469 case CPP_HSPACE: case CPP_COMMENT:
472 return cppReader_parseNumber (pfile, tok_start, tok_end - tok_start);
474 cppReader_errorLit (pfile,
475 cstring_makeLiteralTemp ("string constants not allowed in #if expressions"));
476 op.op = CPPREADER_ERRORTOK;
479 /* This code for reading a character constant
480 handles multicharacter constants and wide characters.
481 It is mostly copied from c-lex.c. */
485 size_t width = MAX_CHAR_TYPE_SIZE;
488 char *ptr = tok_start;
489 #ifdef MULTIBYTE_CHARS
490 char token_buffer[MAX_LONG_TYPE_SIZE/MAX_CHAR_TYPE_SIZE + MB_CUR_MAX];
492 char token_buffer[MAX_LONG_TYPE_SIZE/MAX_CHAR_TYPE_SIZE + 1];
499 width = MAX_WCHAR_TYPE_SIZE;
500 #ifdef MULTIBYTE_CHARS
501 max_chars = MB_CUR_MAX;
508 max_chars = size_toInt (MAX_LONG_TYPE_SIZE / width);
512 /*drl bee: hda*/ while (ptr < tok_end && ((c = *ptr++) != '\''))
516 c = cppReader_parseEscape (pfile, &ptr);
517 if (width < HOST_BITS_PER_INT && c >= (1 << width))
521 cstring_makeLiteralTemp ("Escape sequence out of range for character"));
527 /* Merge character into result; ignore excess chars. */
528 if (num_chars < max_chars + 1)
530 if (width < HOST_BITS_PER_INT)
532 result = (int) ((unsigned) result << width) | (c & ((1 << width) - 1));
539 token_buffer[num_chars - 1] = c;
543 /*drl bee: dad*/ token_buffer[num_chars] = 0;
546 cppReader_errorLit (pfile,
547 cstring_makeLiteralTemp ("malformatted character constant"));
548 else if (num_chars == 0)
549 cppReader_errorLit (pfile,
550 cstring_makeLiteralTemp ("empty character constant"));
551 else if (num_chars > max_chars)
553 num_chars = max_chars;
554 cppReader_errorLit (pfile,
555 cstring_makeLiteralTemp ("character constant too long"));
557 else if (num_chars != 1 && ! cppReader_isTraditional (pfile))
559 cppReader_warningLit (pfile,
560 cstring_makeLiteralTemp ("multi-character character constant"));
567 /* If char type is signed, sign-extend the constant. */
570 int num_bits = num_chars * width;
572 if ((cpphash_lookup ("__CHAR_UNSIGNED__",
573 sizeof ("__CHAR_UNSIGNED__") - 1, -1) != NULL)
574 || (((unsigned) result >> (int_toNonNegative (num_bits - 1))) & 1) == 0)
577 = result & ((unsigned long) ~0
578 >> int_toNonNegative ((HOST_BITS_PER_LONG - num_bits)));
583 = result | ~((unsigned long) ~0
584 >> int_toNonNegative ((HOST_BITS_PER_LONG - num_bits)));
589 #ifdef MULTIBYTE_CHARS
590 /* Set the initial shift state and convert the next sequence. */
592 /* In all locales L'\0' is zero and mbtowc will return zero,
595 || (num_chars == 1 && token_buffer[0] != '\0'))
598 (void) mbtowc (NULL, NULL, 0);
599 if (mbtowc (& wc, token_buffer, num_chars) == num_chars)
602 cppReader_pedwarn (pfile,"Ignoring invalid multibyte character");
609 /* This is always a signed type. */
610 op.unsignedp = FALSE;
617 return cppReader_parseNumber (pfile, "0", 0);
620 /* See if it is a special token of length 2. */
621 if (tok_start + 2 == tok_end)
623 for (toktab = tokentab2; toktab->operator != NULL; toktab++)
625 /*drl bee: hda*/ if (tok_start[0] == /*drl bee: hda*/ toktab->operator[0]
626 && /*drl bee: hda*/ tok_start[1] == /*drl bee: hda*/ toktab->operator[1])
628 /*@loopbreak@*/ break;
632 if (toktab->token == CPPREADER_ERRORTOK)
634 cppReader_error (pfile, message ("`%s' not allowed in operand of `#if'", cstring_fromChars (tok_start)));
637 op.op = toktab->token;
651 /* Parse a C escape sequence. STRING_PTR points to a variable
652 containing a pointer to the string to parse. That pointer
653 is updated past the characters we use. The value of the
654 escape sequence is returned.
656 A negative value means the sequence \ newline was seen,
657 which is supposed to be equivalent to nothing at all.
659 If \ is followed by a null character, we return a negative
660 value and leave the string pointer pointing at the null character.
662 If \ is followed by 000, we return 0 and leave the string pointer
663 after the zeros. A value of 0 does not mean end of string. */
666 cppReader_parseEscape (cppReader *pfile, char **string_ptr)
668 /*drl bee: pbr*/ char c = *(*string_ptr)++;
678 if (cppReader_isPedantic (pfile))
680 cppReader_pedwarn (pfile,
681 message ("non-ANSI-standard escape sequence, `\\%c'", c));
687 return TARGET_NEWLINE;
709 int i = (int) c - '0';
714 c = *(*string_ptr)++;
715 if (c >= '0' && c <= '7')
717 i = ((unsigned) i << 3) + c - '0';
722 /*drl bee: pbr*/ (*string_ptr)--;
723 /*@loopbreak@*/ break;
726 if ((i & ~((1 << MAX_CHAR_TYPE_SIZE) - 1)) != 0)
728 i &= (1 << MAX_CHAR_TYPE_SIZE) - 1;
729 cppReader_pedwarnLit (pfile,
730 cstring_makeLiteralTemp ("octal character constant does not fit in a byte"));
736 register unsigned i = 0, overflow = 0, digits_found = 0, digit;
739 c = *(*string_ptr)++;
741 if (c >= '0' && c <= '9')
743 digit = (unsigned int) (c - '0');
745 else if (c >= 'a' && c <= 'f')
747 digit = (unsigned int) (c - 'a') + 10;
749 else if (c >= 'A' && c <= 'F')
751 digit = (unsigned int) (c - 'A') + 10;
756 /*@loopbreak@*/ break;
758 overflow |= i ^ (i << 4 >> 4);
759 i = (i << 4) + digit;
763 if (digits_found == 0)
765 cppReader_errorLit (pfile,
766 cstring_makeLiteralTemp ("\\x used with no following hex digits"));
769 if ((overflow | (i & ~((1 << int_toNonNegative (BITS_PER_UNIT)) - 1))) != 0)
771 i &= (1 << BITS_PER_UNIT) - 1;
772 cppReader_pedwarnLit (pfile,
773 cstring_makeLiteralTemp ("hex character constant does not fit in a byte"));
784 integer_overflow (cppReader *pfile)
786 if (cppReader_isPedantic (pfile))
787 cppReader_pedwarnLit (pfile,
788 cstring_makeLiteralTemp ("integer overflow in preprocessor expression"));
792 left_shift (cppReader *pfile, long a, bool unsignedp, size_t b)
794 if (b >= HOST_BITS_PER_LONG)
796 if (!unsignedp && a != 0)
798 integer_overflow (pfile);
805 return (unsigned long) a << b;
809 long l = int_toNonNegative (a) << b;
811 if (int_toNonNegative (l) >> b != a)
813 integer_overflow (pfile);
821 right_shift (long a, bool unsignedp, unsigned long b)
823 if (b >= HOST_BITS_PER_LONG)
824 return (unsignedp ? 0 : int_toNonNegative (a) >> (HOST_BITS_PER_LONG - 1));
826 return (unsigned long) a >> b;
828 return int_toNonNegative (a) >> b;
831 /* These priorities are all even, so we can handle associatively. */
833 /*@constant int PAREN_INNER_PRIO@*/
834 #define PAREN_INNER_PRIO 0
836 /*@constant int COMMA_PRIO@*/
839 /*@constant int COND_PRIO@*/
840 #define COND_PRIO (COMMA_PRIO+2)
842 /*@constant int OROR_PRIO@*/
843 #define OROR_PRIO (COND_PRIO+2)
845 /*@constant int ANDAND_PRIO@*/
846 #define ANDAND_PRIO (OROR_PRIO+2)
848 /*@constant int OR_PRIO@*/
849 #define OR_PRIO (ANDAND_PRIO+2)
851 /*@constant int XOR_PRIO@*/
852 #define XOR_PRIO (OR_PRIO+2)
854 /*@constant int AND_PRIO@*/
855 #define AND_PRIO (XOR_PRIO+2)
857 /*@constant int CPP_EQUAL_PRIO@*/
858 #define CPP_EQUAL_PRIO (AND_PRIO+2)
860 /*@constant int LESS_PRIO@*/
861 #define LESS_PRIO (CPP_EQUAL_PRIO+2)
863 /*@constant int SHIFT_PRIO@*/
864 #define SHIFT_PRIO (LESS_PRIO+2)
866 /*@constant int PLUS_PRIO@*/
867 #define PLUS_PRIO (SHIFT_PRIO+2)
869 /*@constant int MUL_PRIO@*/
870 #define MUL_PRIO (PLUS_PRIO+2)
872 /*@constant int UNARY_PRIO@*/
873 #define UNARY_PRIO (MUL_PRIO+2)
875 /*@constant int PAREN_OUTER_PRIO@*/
876 #define PAREN_OUTER_PRIO (UNARY_PRIO+2)
879 #define COMPARE(OP) \
880 top->unsignedp = FALSE;\
881 top->value = ((unsigned1 || unsigned2) \
882 ? (unsigned long) v1 OP (unsigned long) v2 \
883 : ((long) v1 OP (long) v2)) ? 1 : 0
885 /* Parse and evaluate a C expression, reading from PFILE.
886 Returns the value of the expression. */
888 /*@constant int INIT_STACK_SIZE@*/
889 # define INIT_STACK_SIZE 20
892 cppReader_parseExpression (cppReader *pfile)
894 /* The implementation is an operator precedence parser,
895 i.e. a bottom-up parser, using a stack for not-yet-reduced tokens.
897 The stack base is 'stack', and the current stack pointer is 'top'.
898 There is a stack element for each operator (only),
899 and the most recently pushed operator is 'top->op'.
900 An operand (value) is stored in the 'value' field of the stack
901 element of the operator that precedes it.
902 In that case the 'flags' field has the HAVE_VALUE flag set. */
904 struct operation init_stack[INIT_STACK_SIZE];
905 struct operation *stack = init_stack;
906 struct operation *limit = stack + INIT_STACK_SIZE;
907 register struct operation *top = stack;
908 int lprio, rprio = 0;
909 int skip_evaluation = 0;
920 op = cppexp_lex (pfile);
922 /* See if the token is an operand, in which case go to set_value.
923 If the token is an operator, figure out its left and right
924 priorities, and then goto maybe_reduce. */
929 top->value = 0, top->unsignedp = FALSE;
933 top->value = op.value;
934 top->unsignedp = op.unsignedp;
937 lprio = 0; goto maybe_reduce;
939 /* Is this correct if unary ? FIXME */
940 flags = RIGHT_OPERAND_REQUIRED;
941 lprio = PLUS_PRIO; rprio = lprio + 1; goto maybe_reduce;
943 flags = RIGHT_OPERAND_REQUIRED;
944 rprio = UNARY_PRIO; lprio = rprio + 1; goto maybe_reduce;
945 case '*': case '/': case '%':
946 lprio = MUL_PRIO; goto binop;
947 case '<': case '>': case LEQ: case GEQ:
948 lprio = LESS_PRIO; goto binop;
949 case CPP_EQUALTOK: case NOTEQUAL:
950 lprio = CPP_EQUAL_PRIO; goto binop;
952 lprio = SHIFT_PRIO; goto binop;
953 case '&': lprio = AND_PRIO; goto binop;
954 case '^': lprio = XOR_PRIO; goto binop;
955 case '|': lprio = OR_PRIO; goto binop;
956 case ANDAND: lprio = ANDAND_PRIO; goto binop;
957 case OROR: lprio = OROR_PRIO; goto binop;
959 lprio = COMMA_PRIO; goto binop;
961 lprio = PAREN_OUTER_PRIO; rprio = PAREN_INNER_PRIO;
964 lprio = PAREN_INNER_PRIO; rprio = PAREN_OUTER_PRIO;
967 lprio = COND_PRIO; rprio = COND_PRIO;
970 lprio = COND_PRIO + 1; rprio = COND_PRIO;
973 flags = LEFT_OPERAND_REQUIRED | RIGHT_OPERAND_REQUIRED;
979 message ("Invalid character in #if: %c",
985 /* Push a value onto the stack. */
986 if ((top->flags & HAVE_VALUE) != 0)
988 cppReader_errorLit (pfile,
989 cstring_makeLiteralTemp ("syntax error in #if"));
992 top->flags |= HAVE_VALUE;
996 /* Push an operator, and check if we can reduce now. */
997 while (top->rprio > lprio)
1000 long v1 = top[-1].value, v2 = top[0].value;
1001 bool unsigned1 = top[-1].unsignedp;
1002 bool unsigned2 = top[0].unsignedp;
1006 if (((top[1].flags & LEFT_OPERAND_REQUIRED) != 0)
1007 && ((top[0].flags & HAVE_VALUE) == 0))
1009 cppReader_errorLit (pfile,
1010 cstring_makeLiteralTemp ("syntax error - missing left operand"));
1013 if (((top[1].flags & RIGHT_OPERAND_REQUIRED) != 0)
1014 && ((top[1].flags & HAVE_VALUE) == 0))
1016 cppReader_errorLit (pfile,
1017 cstring_makeLiteralTemp ("syntax error - missing right operand"));
1020 /* top[0].value = (top[1].op)(v1, v2);*/
1024 if ((top->flags & HAVE_VALUE) == 0)
1027 top->unsignedp = unsigned2;
1028 top->flags |= HAVE_VALUE;
1032 top->value = v1 + v2;
1033 top->unsignedp = unsigned1 || unsigned2;
1034 if (!top->unsignedp && (skip_evaluation == 0)
1035 && ! possibleSumSign (v1, v2, top->value))
1036 integer_overflow (pfile);
1038 /*@switchbreak@*/ break;
1040 if ((top->flags & HAVE_VALUE) == 0)
1043 if ((skip_evaluation == 0)
1044 && (top->value & v2) < 0 && !unsigned2)
1045 integer_overflow (pfile);
1046 top->unsignedp = unsigned2;
1047 top->flags |= HAVE_VALUE;
1051 top->value = v1 - v2;
1052 top->unsignedp = unsigned1 || unsigned2;
1053 if (!top->unsignedp && (skip_evaluation == 0)
1054 && !possibleSumSign (top->value, v2, v1))
1056 integer_overflow (pfile);
1059 /*@switchbreak@*/ break;
1061 top->unsignedp = unsigned1 || unsigned2;
1065 top->value = (unsigned long) v1 * v2;
1067 else if (skip_evaluation == 0)
1069 top->value = v1 * v2;
1071 && (top->value / v1 != v2
1072 || (top->value & v1 & v2) < 0))
1074 integer_overflow (pfile);
1082 /*@switchbreak@*/ break;
1084 if (skip_evaluation != 0)
1085 /*@switchbreak@*/ break;
1088 cppReader_errorLit (pfile,
1089 cstring_makeLiteralTemp ("Division by zero in #if"));
1092 top->unsignedp = unsigned1 || unsigned2;
1094 top->value = (unsigned long) v1 / v2;
1097 top->value = v1 / v2;
1098 if ((top->value & v1 & v2) < 0)
1099 integer_overflow (pfile);
1101 /*@switchbreak@*/ break;
1103 if (skip_evaluation != 0)
1104 /*@switchbreak@*/ break;
1107 cppReader_errorLit (pfile,
1108 cstring_makeLiteralTemp ("Division by zero in #if"));
1111 top->unsignedp = unsigned1 || unsigned2;
1113 top->value = (unsigned long) v1 % v2;
1115 top->value = v1 % v2;
1116 /*@switchbreak@*/ break;
1118 if ((top->flags & HAVE_VALUE) != 0)
1120 cppReader_errorLit (pfile,
1121 cstring_makeLiteralTemp ("Syntax error"));
1125 top->value = (v2 == 0) ? 1 : 0;
1126 top->unsignedp = FALSE;
1127 top->flags |= HAVE_VALUE;
1128 /*@switchbreak@*/ break;
1130 if ((top->flags & HAVE_VALUE) != 0)
1132 cppReader_errorLit (pfile,
1133 cstring_makeLiteralTemp ("syntax error"));
1137 top->unsignedp = unsigned2;
1138 top->flags |= HAVE_VALUE;
1139 /*@switchbreak@*/ break;
1140 case '<': COMPARE(<); /*@switchbreak@*/ break;
1141 case '>': COMPARE(>); /*@switchbreak@*/ break;
1142 case LEQ: COMPARE(<=); /*@switchbreak@*/ break;
1143 case GEQ: COMPARE(>=); /*@switchbreak@*/ break;
1145 top->value = (v1 == v2) ? 1 : 0;
1146 top->unsignedp = FALSE;
1147 /*@switchbreak@*/ break;
1149 top->value = (v1 != v2) ? 1 : 0;
1150 top->unsignedp = FALSE;
1151 /*@switchbreak@*/ break;
1153 if (skip_evaluation != 0)
1155 /*@switchbreak@*/ break;
1158 top->unsignedp = unsigned1;
1159 if (v2 < 0 && ! unsigned2)
1160 top->value = right_shift (v1, unsigned1, -v2);
1162 top->value = left_shift (pfile, v1, unsigned1, v2);
1163 /*@switchbreak@*/ break;
1165 if (skip_evaluation != 0)
1167 /*@switchbreak@*/ break;
1169 top->unsignedp = unsigned1;
1170 if (v2 < 0 && ! unsigned2)
1171 top->value = left_shift (pfile, v1, unsigned1, -v2);
1173 top->value = right_shift (v1, unsigned1, v2);
1174 /*@switchbreak@*/ break;
1177 #define LOGICAL(OP) \
1178 top->value = v1 OP v2;\
1179 top->unsignedp = unsigned1 || unsigned2;
1181 case '&': LOGICAL(&); /*@switchbreak@*/ break;
1182 case '^': LOGICAL(^); /*@switchbreak@*/ break;
1183 case '|': LOGICAL(|); /*@switchbreak@*/ break;
1185 top->value = ((v1 != 0) && (v2 != 0)) ? 1 : 0;
1186 top->unsignedp = FALSE;
1192 /*@switchbreak@*/ break;
1194 top->value = ((v1 != 0) || (v2 != 0)) ? 1 : 0;
1195 top->unsignedp = FALSE;
1200 /*@switchbreak@*/ break;
1202 if (cppReader_isPedantic (pfile))
1203 cppReader_pedwarnLit (pfile,
1204 cstring_makeLiteralTemp ("comma operator in operand of `#if'"));
1206 top->unsignedp = unsigned2;
1207 /*@switchbreak@*/ break;
1209 cppReader_errorLit (pfile,
1210 cstring_makeLiteralTemp ("syntax error in #if"));
1213 if (top[0].op != '?')
1215 cppReader_errorLit (pfile,
1216 cstring_makeLiteralTemp ("syntax error ':' without preceding '?'"));
1219 else if (((top[1].flags & HAVE_VALUE) == 0)
1220 || ((top[-1].flags & HAVE_VALUE) == 0)
1221 || ((top[0].flags & HAVE_VALUE) == 0))
1223 cppReader_errorLit (pfile,
1224 cstring_makeLiteralTemp ("bad syntax for ?: operator"));
1230 if (top->value != 0)
1235 top->value = (top->value != 0) ? v1 : v2;
1236 top->unsignedp = unsigned1 || unsigned2;
1238 /*@switchbreak@*/ break;
1240 if (((top[1].flags & HAVE_VALUE) != 0)
1241 || ((top[0].flags & HAVE_VALUE) == 0)
1243 || ((top[-1].flags & HAVE_VALUE) != 0))
1245 cppReader_errorLit (pfile,
1246 cstring_makeLiteralTemp ("mismatched parentheses in #if"));
1253 top->unsignedp = unsigned1;
1254 top->flags |= HAVE_VALUE;
1256 /*@switchbreak@*/ break;
1260 top[1].op >= ' ' && top[1].op <= '~'
1261 ? "unimplemented operator '%c'\n"
1262 : "unimplemented operator '\\%03o'\n",
1273 cppReader_errorLit (pfile,
1274 cstring_makeLiteralTemp ("internal error in #if expression"));
1279 if (stack != init_stack)
1283 } /*@=branchstate@*/
1289 /* Check for and handle stack overflow. */
1292 struct operation *new_stack;
1293 int old_size = (char *) limit - (char *) stack;
1294 size_t new_size = size_fromInt (2 * old_size);
1296 if (stack != init_stack)
1298 new_stack = (struct operation *) drealloc ((char *) stack,
1303 new_stack = (struct operation *) dmalloc (new_size);
1305 /* Bug: the parameters were in the wrong order! */
1306 memcpy ((char *) new_stack, (char *) stack, old_size);
1308 } /*@=branchstate@*/
1311 top = (struct operation *) ((char *) new_stack + old_size);
1312 limit = (struct operation *) ((char *) new_stack + new_size);
1314 } /*@=branchstate@*/
1319 if ((op.op == OROR && (top[-1].value != 0))
1320 || (op.op == ANDAND && (top[-1].value == 0))
1321 || (op.op == '?' && (top[-1].value == 0)))
1325 else if (op.op == ':')
1327 if (top[-2].value != 0) /* Was condition true? */
1343 if (stack != init_stack)
1347 } /*@=branchstate@*/
1350 cppReader_skipRestOfLine (pfile);