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)
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++)
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")))
286 /* Some buggy compilers (e.g. MPW C) seem to need both casts. */
287 ULONG_MAX_over_base = ((unsigned long) -1) / ((unsigned long) base);
289 for (; len > 0; len--) {
292 if (c >= '0' && c <= '9')
294 digit = (int) (c - '0');
296 else if (base == 16 && c >= 'a' && c <= 'f')
298 digit = (int) (c - 'a') + 10;
300 else if (base == 16 && c >= 'A' && c <= 'F')
302 digit = (int) (c - 'A') + 10;
306 /* `l' means long, and `u' means unsigned. */
309 if (c == 'l' || c == 'L')
312 cppReader_errorLit (pfile,
313 cstring_makeLiteralTemp ("two `l's in integer constant"));
316 else if (c == 'u' || c == 'U')
319 cppReader_errorLit (pfile,
320 cstring_makeLiteralTemp ("two `u's in integer constant"));
325 /*@innerbreak@*/ break;
330 /*@innerbreak@*/ break;
335 /* Don't look for any more digits after the suffixes. */
339 if (largest_digit < digit)
341 largest_digit = digit;
344 nd = (long unsigned) (n * base + digit);
345 overflow |= (ULONG_MAX_over_base < (unsigned long) n)
346 | (nd < (unsigned long) n);
354 cstring_makeLiteralTemp ("Invalid number in #if expression"));
355 op.op = CPPREADER_ERRORTOK;
359 if (base <= largest_digit)
363 cstring_makeLiteralTemp
364 ("Integer constant contains digits beyond the radix"));
369 /*@i23 add flags for all these...*/
372 cstring_makeLiteralTemp ("Integer constant out of range"));
375 /* If too big to be signed, consider it unsigned. */
376 if ((long) n < 0 && ! op.unsignedp)
382 cstring_makeLiteralTemp ("Integer constant is so large that it is unsigned"));
390 DPRINTF (("Parse number: %d", op.value));
395 /*@null@*/ /*@observer@*/ char *operator;
399 static struct token tokentab2[] = {
404 { "==", CPP_EQUALTOK },
408 { "++", CPPREADER_ERRORTOK },
409 { "--", CPPREADER_ERRORTOK },
410 { NULL, CPPREADER_ERRORTOK }
413 /* Read one token. */
415 struct operation cppexp_lex (cppReader *pfile)
419 register struct token *toktab;
420 enum cpp_token token;
422 char *tok_start, *tok_end;
427 old_written = size_toInt (cpplib_getWritten (pfile));
428 cppSkipHspace (pfile);
429 ic = cpplib_bufPeek (cppReader_getBufferSafe (pfile));
433 DPRINTF (("Read: %c", c));
441 token = cpplib_getTokenForceExpand (pfile);
443 tok_start = pfile->token_buffer + old_written;
444 tok_end = cpplib_getPWritten (pfile);
446 DPRINTF (("Token: %s < %s", tok_start, tok_end));
448 pfile->limit = tok_start;
452 case CPP_EOF: /* Should not happen ... */
457 if (cstring_isDefined (cppReader_getBufferSafe (pfile)->fname))
462 (void) cppReader_popBuffer (pfile);
464 case CPP_HSPACE: case CPP_COMMENT:
467 return cppReader_parseNumber (pfile, tok_start, tok_end - tok_start);
469 cppReader_errorLit (pfile,
470 cstring_makeLiteralTemp ("string constants not allowed in #if expressions"));
471 op.op = CPPREADER_ERRORTOK;
474 /* This code for reading a character constant
475 handles multicharacter constants and wide characters.
476 It is mostly copied from c-lex.c. */
480 size_t width = MAX_CHAR_TYPE_SIZE;
483 char *ptr = tok_start;
484 #ifdef MULTIBYTE_CHARS
485 char token_buffer[MAX_LONG_TYPE_SIZE/MAX_CHAR_TYPE_SIZE + MB_CUR_MAX];
487 char token_buffer[MAX_LONG_TYPE_SIZE/MAX_CHAR_TYPE_SIZE + 1];
494 width = MAX_WCHAR_TYPE_SIZE;
495 #ifdef MULTIBYTE_CHARS
496 max_chars = MB_CUR_MAX;
503 max_chars = size_toInt (MAX_LONG_TYPE_SIZE / width);
507 while (ptr < tok_end && ((c = *ptr++) != '\''))
511 c = cppReader_parseEscape (pfile, &ptr);
512 if (width < HOST_BITS_PER_INT && c >= (1 << width))
516 cstring_makeLiteralTemp ("Escape sequence out of range for character"));
522 /* Merge character into result; ignore excess chars. */
523 if (num_chars < max_chars + 1)
525 if (width < HOST_BITS_PER_INT)
527 result = (int) ((unsigned) result << width) | (c & ((1 << width) - 1));
534 token_buffer[num_chars - 1] = c;
538 token_buffer[num_chars] = 0;
541 cppReader_errorLit (pfile,
542 cstring_makeLiteralTemp ("malformatted character constant"));
543 else if (num_chars == 0)
544 cppReader_errorLit (pfile,
545 cstring_makeLiteralTemp ("empty character constant"));
546 else if (num_chars > max_chars)
548 num_chars = max_chars;
549 cppReader_errorLit (pfile,
550 cstring_makeLiteralTemp ("character constant too long"));
552 else if (num_chars != 1 && ! cppReader_isTraditional (pfile))
554 cppReader_warningLit (pfile,
555 cstring_makeLiteralTemp ("multi-character character constant"));
562 /* If char type is signed, sign-extend the constant. */
565 int num_bits = num_chars * width;
567 if ((cpphash_lookup ("__CHAR_UNSIGNED__",
568 sizeof ("__CHAR_UNSIGNED__") - 1, -1) != NULL)
569 || (((unsigned) result >> (int_toNonNegative (num_bits - 1))) & 1) == 0)
572 = result & ((unsigned long) ~0
573 >> int_toNonNegative ((HOST_BITS_PER_LONG - num_bits)));
578 = result | ~((unsigned long) ~0
579 >> int_toNonNegative ((HOST_BITS_PER_LONG - num_bits)));
584 #ifdef MULTIBYTE_CHARS
585 /* Set the initial shift state and convert the next sequence. */
587 /* In all locales L'\0' is zero and mbtowc will return zero,
590 || (num_chars == 1 && token_buffer[0] != '\0'))
593 (void) mbtowc (NULL, NULL, 0);
594 if (mbtowc (& wc, token_buffer, num_chars) == num_chars)
597 cppReader_pedwarn (pfile,"Ignoring invalid multibyte character");
604 /* This is always a signed type. */
605 op.unsignedp = FALSE;
612 return cppReader_parseNumber (pfile, "0", 0);
615 /* See if it is a special token of length 2. */
616 if (tok_start + 2 == tok_end)
618 for (toktab = tokentab2; toktab->operator != NULL; toktab++)
620 if (tok_start[0] == toktab->operator[0]
621 && tok_start[1] == toktab->operator[1])
623 /*@loopbreak@*/ break;
627 if (toktab->token == CPPREADER_ERRORTOK)
629 cppReader_error (pfile, message ("`%s' not allowed in operand of `#if'", cstring_fromChars (tok_start)));
632 op.op = toktab->token;
646 /* Parse a C escape sequence. STRING_PTR points to a variable
647 containing a pointer to the string to parse. That pointer
648 is updated past the characters we use. The value of the
649 escape sequence is returned.
651 A negative value means the sequence \ newline was seen,
652 which is supposed to be equivalent to nothing at all.
654 If \ is followed by a null character, we return a negative
655 value and leave the string pointer pointing at the null character.
657 If \ is followed by 000, we return 0 and leave the string pointer
658 after the zeros. A value of 0 does not mean end of string. */
661 cppReader_parseEscape (cppReader *pfile, char **string_ptr)
663 char c = *(*string_ptr)++;
673 if (cppReader_isPedantic (pfile))
675 cppReader_pedwarn (pfile,
676 message ("non-ANSI-standard escape sequence, `\\%c'", c));
682 return TARGET_NEWLINE;
704 int i = (int) c - '0';
709 c = *(*string_ptr)++;
710 if (c >= '0' && c <= '7')
712 i = ((unsigned) i << 3) + c - '0';
718 /*@loopbreak@*/ break;
721 if ((i & ~((1 << MAX_CHAR_TYPE_SIZE) - 1)) != 0)
723 i &= (1 << MAX_CHAR_TYPE_SIZE) - 1;
724 cppReader_pedwarnLit (pfile,
725 cstring_makeLiteralTemp ("octal character constant does not fit in a byte"));
731 register unsigned i = 0, overflow = 0, digits_found = 0, digit;
734 c = *(*string_ptr)++;
736 if (c >= '0' && c <= '9')
738 digit = (unsigned int) (c - '0');
740 else if (c >= 'a' && c <= 'f')
742 digit = (unsigned int) (c - 'a') + 10;
744 else if (c >= 'A' && c <= 'F')
746 digit = (unsigned int) (c - 'A') + 10;
751 /*@loopbreak@*/ break;
753 overflow |= i ^ (i << 4 >> 4);
754 i = (i << 4) + digit;
758 if (digits_found == 0)
760 cppReader_errorLit (pfile,
761 cstring_makeLiteralTemp ("\\x used with no following hex digits"));
764 if ((overflow | (i & ~((1 << int_toNonNegative (BITS_PER_UNIT)) - 1))) != 0)
766 i &= (1 << BITS_PER_UNIT) - 1;
767 cppReader_pedwarnLit (pfile,
768 cstring_makeLiteralTemp ("hex character constant does not fit in a byte"));
779 integer_overflow (cppReader *pfile)
781 if (cppReader_isPedantic (pfile))
782 cppReader_pedwarnLit (pfile,
783 cstring_makeLiteralTemp ("integer overflow in preprocessor expression"));
787 left_shift (cppReader *pfile, long a, bool unsignedp, size_t b)
789 if (b >= HOST_BITS_PER_LONG)
791 if (!unsignedp && a != 0)
793 integer_overflow (pfile);
800 return (unsigned long) a << b;
804 long l = int_toNonNegative (a) << b;
806 if (int_toNonNegative (l) >> b != a)
808 integer_overflow (pfile);
816 right_shift (long a, bool unsignedp, unsigned long b)
818 if (b >= HOST_BITS_PER_LONG)
819 return (unsignedp ? 0 : int_toNonNegative (a) >> (HOST_BITS_PER_LONG - 1));
821 return (unsigned long) a >> b;
823 return int_toNonNegative (a) >> b;
826 /* These priorities are all even, so we can handle associatively. */
828 /*@constant int PAREN_INNER_PRIO@*/
829 #define PAREN_INNER_PRIO 0
831 /*@constant int COMMA_PRIO@*/
834 /*@constant int COND_PRIO@*/
835 #define COND_PRIO (COMMA_PRIO+2)
837 /*@constant int OROR_PRIO@*/
838 #define OROR_PRIO (COND_PRIO+2)
840 /*@constant int ANDAND_PRIO@*/
841 #define ANDAND_PRIO (OROR_PRIO+2)
843 /*@constant int OR_PRIO@*/
844 #define OR_PRIO (ANDAND_PRIO+2)
846 /*@constant int XOR_PRIO@*/
847 #define XOR_PRIO (OR_PRIO+2)
849 /*@constant int AND_PRIO@*/
850 #define AND_PRIO (XOR_PRIO+2)
852 /*@constant int CPP_EQUAL_PRIO@*/
853 #define CPP_EQUAL_PRIO (AND_PRIO+2)
855 /*@constant int LESS_PRIO@*/
856 #define LESS_PRIO (CPP_EQUAL_PRIO+2)
858 /*@constant int SHIFT_PRIO@*/
859 #define SHIFT_PRIO (LESS_PRIO+2)
861 /*@constant int PLUS_PRIO@*/
862 #define PLUS_PRIO (SHIFT_PRIO+2)
864 /*@constant int MUL_PRIO@*/
865 #define MUL_PRIO (PLUS_PRIO+2)
867 /*@constant int UNARY_PRIO@*/
868 #define UNARY_PRIO (MUL_PRIO+2)
870 /*@constant int PAREN_OUTER_PRIO@*/
871 #define PAREN_OUTER_PRIO (UNARY_PRIO+2)
874 #define COMPARE(OP) \
875 top->unsignedp = FALSE;\
876 top->value = ((unsigned1 || unsigned2) \
877 ? (unsigned long) v1 OP (unsigned long) v2 \
878 : ((long) v1 OP (long) v2)) ? 1 : 0
880 /* Parse and evaluate a C expression, reading from PFILE.
881 Returns the value of the expression. */
883 /*@constant int INIT_STACK_SIZE@*/
884 # define INIT_STACK_SIZE 20
887 cppReader_parseExpression (cppReader *pfile)
889 /* The implementation is an operator precedence parser,
890 i.e. a bottom-up parser, using a stack for not-yet-reduced tokens.
892 The stack base is 'stack', and the current stack pointer is 'top'.
893 There is a stack element for each operator (only),
894 and the most recently pushed operator is 'top->op'.
895 An operand (value) is stored in the 'value' field of the stack
896 element of the operator that precedes it.
897 In that case the 'flags' field has the HAVE_VALUE flag set. */
899 struct operation init_stack[INIT_STACK_SIZE];
900 struct operation *stack = init_stack;
901 struct operation *limit = stack + INIT_STACK_SIZE;
902 register struct operation *top = stack;
903 int lprio, rprio = 0;
904 int skip_evaluation = 0;
915 op = cppexp_lex (pfile);
917 /* See if the token is an operand, in which case go to set_value.
918 If the token is an operator, figure out its left and right
919 priorities, and then goto maybe_reduce. */
924 top->value = 0, top->unsignedp = FALSE;
928 top->value = op.value;
929 top->unsignedp = op.unsignedp;
932 lprio = 0; goto maybe_reduce;
934 /* Is this correct if unary ? FIXME */
935 flags = RIGHT_OPERAND_REQUIRED;
936 lprio = PLUS_PRIO; rprio = lprio + 1; goto maybe_reduce;
938 flags = RIGHT_OPERAND_REQUIRED;
939 rprio = UNARY_PRIO; lprio = rprio + 1; goto maybe_reduce;
940 case '*': case '/': case '%':
941 lprio = MUL_PRIO; goto binop;
942 case '<': case '>': case LEQ: case GEQ:
943 lprio = LESS_PRIO; goto binop;
944 case CPP_EQUALTOK: case NOTEQUAL:
945 lprio = CPP_EQUAL_PRIO; goto binop;
947 lprio = SHIFT_PRIO; goto binop;
948 case '&': lprio = AND_PRIO; goto binop;
949 case '^': lprio = XOR_PRIO; goto binop;
950 case '|': lprio = OR_PRIO; goto binop;
951 case ANDAND: lprio = ANDAND_PRIO; goto binop;
952 case OROR: lprio = OROR_PRIO; goto binop;
954 lprio = COMMA_PRIO; goto binop;
956 lprio = PAREN_OUTER_PRIO; rprio = PAREN_INNER_PRIO;
959 lprio = PAREN_INNER_PRIO; rprio = PAREN_OUTER_PRIO;
962 lprio = COND_PRIO; rprio = COND_PRIO;
965 lprio = COND_PRIO + 1; rprio = COND_PRIO;
968 flags = LEFT_OPERAND_REQUIRED | RIGHT_OPERAND_REQUIRED;
974 message ("Invalid character in #if: %c",
980 /* Push a value onto the stack. */
981 if ((top->flags & HAVE_VALUE) != 0)
983 cppReader_errorLit (pfile,
984 cstring_makeLiteralTemp ("syntax error in #if"));
987 top->flags |= HAVE_VALUE;
991 /* Push an operator, and check if we can reduce now. */
992 while (top->rprio > lprio)
995 long v1 = top[-1].value, v2 = top[0].value;
996 bool unsigned1 = top[-1].unsignedp;
997 bool unsigned2 = top[0].unsignedp;
1001 if (((top[1].flags & LEFT_OPERAND_REQUIRED) != 0)
1002 && ((top[0].flags & HAVE_VALUE) == 0))
1004 cppReader_errorLit (pfile,
1005 cstring_makeLiteralTemp ("syntax error - missing left operand"));
1008 if (((top[1].flags & RIGHT_OPERAND_REQUIRED) != 0)
1009 && ((top[1].flags & HAVE_VALUE) == 0))
1011 cppReader_errorLit (pfile,
1012 cstring_makeLiteralTemp ("syntax error - missing right operand"));
1015 /* top[0].value = (top[1].op)(v1, v2);*/
1019 if ((top->flags & HAVE_VALUE) == 0)
1022 top->unsignedp = unsigned2;
1023 top->flags |= HAVE_VALUE;
1027 top->value = v1 + v2;
1028 top->unsignedp = unsigned1 || unsigned2;
1029 if (!top->unsignedp && (skip_evaluation == 0)
1030 && ! possibleSumSign (v1, v2, top->value))
1031 integer_overflow (pfile);
1033 /*@switchbreak@*/ break;
1035 if ((top->flags & HAVE_VALUE) == 0)
1038 if ((skip_evaluation == 0)
1039 && (top->value & v2) < 0 && !unsigned2)
1040 integer_overflow (pfile);
1041 top->unsignedp = unsigned2;
1042 top->flags |= HAVE_VALUE;
1046 top->value = v1 - v2;
1047 top->unsignedp = unsigned1 || unsigned2;
1048 if (!top->unsignedp && (skip_evaluation == 0)
1049 && !possibleSumSign (top->value, v2, v1))
1051 integer_overflow (pfile);
1054 /*@switchbreak@*/ break;
1056 top->unsignedp = unsigned1 || unsigned2;
1060 top->value = (unsigned long) v1 * v2;
1062 else if (skip_evaluation == 0)
1064 top->value = v1 * v2;
1066 && (top->value / v1 != v2
1067 || (top->value & v1 & v2) < 0))
1069 integer_overflow (pfile);
1077 /*@switchbreak@*/ break;
1079 if (skip_evaluation != 0)
1080 /*@switchbreak@*/ break;
1083 cppReader_errorLit (pfile,
1084 cstring_makeLiteralTemp ("Division by zero in #if"));
1087 top->unsignedp = unsigned1 || unsigned2;
1089 top->value = (unsigned long) v1 / v2;
1092 top->value = v1 / v2;
1093 if ((top->value & v1 & v2) < 0)
1094 integer_overflow (pfile);
1096 /*@switchbreak@*/ break;
1098 if (skip_evaluation != 0)
1099 /*@switchbreak@*/ break;
1102 cppReader_errorLit (pfile,
1103 cstring_makeLiteralTemp ("Division by zero in #if"));
1106 top->unsignedp = unsigned1 || unsigned2;
1108 top->value = (unsigned long) v1 % v2;
1110 top->value = v1 % v2;
1111 /*@switchbreak@*/ break;
1113 if ((top->flags & HAVE_VALUE) != 0)
1115 cppReader_errorLit (pfile,
1116 cstring_makeLiteralTemp ("Syntax error"));
1120 top->value = (v2 == 0) ? 1 : 0;
1121 top->unsignedp = FALSE;
1122 top->flags |= HAVE_VALUE;
1123 /*@switchbreak@*/ break;
1125 if ((top->flags & HAVE_VALUE) != 0)
1127 cppReader_errorLit (pfile,
1128 cstring_makeLiteralTemp ("syntax error"));
1132 top->unsignedp = unsigned2;
1133 top->flags |= HAVE_VALUE;
1134 /*@switchbreak@*/ break;
1135 case '<': COMPARE(<); /*@switchbreak@*/ break;
1136 case '>': COMPARE(>); /*@switchbreak@*/ break;
1137 case LEQ: COMPARE(<=); /*@switchbreak@*/ break;
1138 case GEQ: COMPARE(>=); /*@switchbreak@*/ break;
1140 top->value = (v1 == v2) ? 1 : 0;
1141 top->unsignedp = FALSE;
1142 /*@switchbreak@*/ break;
1144 top->value = (v1 != v2) ? 1 : 0;
1145 top->unsignedp = FALSE;
1146 /*@switchbreak@*/ break;
1148 if (skip_evaluation != 0)
1150 /*@switchbreak@*/ break;
1153 top->unsignedp = unsigned1;
1154 if (v2 < 0 && ! unsigned2)
1155 top->value = right_shift (v1, unsigned1, -v2);
1157 top->value = left_shift (pfile, v1, unsigned1, v2);
1158 /*@switchbreak@*/ break;
1160 if (skip_evaluation != 0)
1162 /*@switchbreak@*/ break;
1164 top->unsignedp = unsigned1;
1165 if (v2 < 0 && ! unsigned2)
1166 top->value = left_shift (pfile, v1, unsigned1, -v2);
1168 top->value = right_shift (v1, unsigned1, v2);
1169 /*@switchbreak@*/ break;
1172 #define LOGICAL(OP) \
1173 top->value = v1 OP v2;\
1174 top->unsignedp = unsigned1 || unsigned2;
1176 case '&': LOGICAL(&); /*@switchbreak@*/ break;
1177 case '^': LOGICAL(^); /*@switchbreak@*/ break;
1178 case '|': LOGICAL(|); /*@switchbreak@*/ break;
1180 top->value = ((v1 != 0) && (v2 != 0)) ? 1 : 0;
1181 top->unsignedp = FALSE;
1187 /*@switchbreak@*/ break;
1189 top->value = ((v1 != 0) || (v2 != 0)) ? 1 : 0;
1190 top->unsignedp = FALSE;
1195 /*@switchbreak@*/ break;
1197 if (cppReader_isPedantic (pfile))
1198 cppReader_pedwarnLit (pfile,
1199 cstring_makeLiteralTemp ("comma operator in operand of `#if'"));
1201 top->unsignedp = unsigned2;
1202 /*@switchbreak@*/ break;
1204 cppReader_errorLit (pfile,
1205 cstring_makeLiteralTemp ("syntax error in #if"));
1208 if (top[0].op != '?')
1210 cppReader_errorLit (pfile,
1211 cstring_makeLiteralTemp ("syntax error ':' without preceding '?'"));
1214 else if (((top[1].flags & HAVE_VALUE) == 0)
1215 || ((top[-1].flags & HAVE_VALUE) == 0)
1216 || ((top[0].flags & HAVE_VALUE) == 0))
1218 cppReader_errorLit (pfile,
1219 cstring_makeLiteralTemp ("bad syntax for ?: operator"));
1225 if (top->value != 0)
1230 top->value = (top->value != 0) ? v1 : v2;
1231 top->unsignedp = unsigned1 || unsigned2;
1233 /*@switchbreak@*/ break;
1235 if (((top[1].flags & HAVE_VALUE) != 0)
1236 || ((top[0].flags & HAVE_VALUE) == 0)
1238 || ((top[-1].flags & HAVE_VALUE) != 0))
1240 cppReader_errorLit (pfile,
1241 cstring_makeLiteralTemp ("mismatched parentheses in #if"));
1248 top->unsignedp = unsigned1;
1249 top->flags |= HAVE_VALUE;
1251 /*@switchbreak@*/ break;
1255 top[1].op >= ' ' && top[1].op <= '~'
1256 ? "unimplemented operator '%c'\n"
1257 : "unimplemented operator '\\%03o'\n",
1268 cppReader_errorLit (pfile,
1269 cstring_makeLiteralTemp ("internal error in #if expression"));
1274 if (stack != init_stack)
1278 } /*@=branchstate@*/
1284 /* Check for and handle stack overflow. */
1287 struct operation *new_stack;
1288 int old_size = (char *) limit - (char *) stack;
1289 size_t new_size = size_fromInt (2 * old_size);
1291 if (stack != init_stack)
1293 new_stack = (struct operation *) drealloc ((char *) stack,
1298 new_stack = (struct operation *) dmalloc (new_size);
1300 /* Bug: the parameters were in the wrong order! */
1301 memcpy ((char *) new_stack, (char *) stack, old_size);
1303 } /*@=branchstate@*/
1306 top = (struct operation *) ((char *) new_stack + old_size);
1307 limit = (struct operation *) ((char *) new_stack + new_size);
1309 } /*@=branchstate@*/
1314 if ((op.op == OROR && (top[-1].value != 0))
1315 || (op.op == ANDAND && (top[-1].value == 0))
1316 || (op.op == '?' && (top[-1].value == 0)))
1320 else if (op.op == ':')
1322 if (top[-2].value != 0) /* Was condition true? */
1338 if (stack != init_stack)
1342 } /*@=branchstate@*/
1345 cppReader_skipRestOfLine (pfile);