2 ** Splint - annotation-assisted static program checker
3 ** Copyright (C) 1994-2003 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: info@splint.org
21 ** To report a bug: splint-bug@splint.org
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, unsigned long);
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++)
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));
435 /* was: llassert (c != '#'); - Solaris uses this, attempt to continue anyway... */
436 cppReader_pedwarn (pfile,
437 message ("non-standard pre-processor directive: %c", c));
440 DPRINTF (("Read: %c", c));
448 token = cpplib_getTokenForceExpand (pfile);
450 tok_start = pfile->token_buffer + old_written;
451 tok_end = cpplib_getPWritten (pfile);
453 DPRINTF (("Token: %s < %s", tok_start, tok_end));
455 pfile->limit = tok_start;
459 case CPP_EOF: /* Should not happen ... */
464 if (cstring_isDefined (cppReader_getBufferSafe (pfile)->fname))
469 (void) cppReader_popBuffer (pfile);
471 case CPP_HSPACE: case CPP_COMMENT:
474 return cppReader_parseNumber (pfile, tok_start, tok_end - tok_start);
476 cppReader_errorLit (pfile,
477 cstring_makeLiteralTemp ("string constants not allowed in #if expressions"));
478 op.op = CPPREADER_ERRORTOK;
481 /* This code for reading a character constant
482 handles multicharacter constants and wide characters.
483 It is mostly copied from c-lex.c. */
487 size_t width = MAX_CHAR_TYPE_SIZE;
490 char *ptr = tok_start;
491 #ifdef MULTIBYTE_CHARS
492 char token_buffer[MAX_LONG_TYPE_SIZE/MAX_CHAR_TYPE_SIZE + MB_CUR_MAX];
494 char token_buffer[MAX_LONG_TYPE_SIZE/MAX_CHAR_TYPE_SIZE + 1];
501 width = MAX_WCHAR_TYPE_SIZE;
502 #ifdef MULTIBYTE_CHARS
503 max_chars = MB_CUR_MAX;
510 max_chars = size_toInt (MAX_LONG_TYPE_SIZE / width);
514 while (ptr < tok_end && ((c = *ptr++) != '\''))
518 c = cppReader_parseEscape (pfile, &ptr);
519 if (width < HOST_BITS_PER_INT && c >= (1 << width))
523 cstring_makeLiteralTemp ("Escape sequence out of range for character"));
529 /* Merge character into result; ignore excess chars. */
530 if (num_chars < max_chars + 1)
532 if (width < HOST_BITS_PER_INT)
534 result = (int) ((unsigned) result << width) | (c & ((1 << width) - 1));
541 token_buffer[num_chars - 1] = c;
545 token_buffer[num_chars] = 0;
548 cppReader_errorLit (pfile,
549 cstring_makeLiteralTemp ("malformatted character constant"));
550 else if (num_chars == 0)
551 cppReader_errorLit (pfile,
552 cstring_makeLiteralTemp ("empty character constant"));
553 else if (num_chars > max_chars)
555 num_chars = max_chars;
556 cppReader_errorLit (pfile,
557 cstring_makeLiteralTemp ("character constant too long"));
559 else if (num_chars != 1 && ! cppReader_isTraditional (pfile))
561 cppReader_warningLit (pfile,
562 cstring_makeLiteralTemp ("multi-character character constant"));
569 /* If char type is signed, sign-extend the constant. */
572 int num_bits = num_chars * width;
574 if ((cpphash_lookup ("__CHAR_UNSIGNED__",
575 sizeof ("__CHAR_UNSIGNED__") - 1, -1) != NULL)
576 || (((unsigned) result >> (int_toNonNegative (num_bits - 1))) & 1) == 0)
579 = result & ((unsigned long) ~0
580 >> int_toNonNegative ((HOST_BITS_PER_LONG - num_bits)));
585 = result | ~((unsigned long) ~0
586 >> int_toNonNegative ((HOST_BITS_PER_LONG - num_bits)));
591 #ifdef MULTIBYTE_CHARS
592 /* Set the initial shift state and convert the next sequence. */
594 /* In all locales L'\0' is zero and mbtowc will return zero,
597 || (num_chars == 1 && token_buffer[0] != '\0'))
600 (void) mbtowc (NULL, NULL, 0);
601 if (mbtowc (& wc, token_buffer, num_chars) == num_chars)
604 cppReader_pedwarn (pfile,"Ignoring invalid multibyte character");
611 /* This is always a signed type. */
612 op.unsignedp = FALSE;
619 return cppReader_parseNumber (pfile, "0", 0);
622 /* See if it is a special token of length 2. */
623 if (tok_start + 2 == tok_end)
625 for (toktab = tokentab2; toktab->operator != NULL; toktab++)
627 if (tok_start[0] == toktab->operator[0] &&
628 tok_start[1] == toktab->operator[1])
630 /*@loopbreak@*/ break;
634 if (toktab->token == CPPREADER_ERRORTOK)
636 cppReader_error (pfile,
637 message ("`%s' not allowed in operand of `#if'",
638 cstring_fromChars (tok_start)));
641 op.op = toktab->token;
655 /* Parse a C escape sequence. STRING_PTR points to a variable
656 containing a pointer to the string to parse. That pointer
657 is updated past the characters we use. The value of the
658 escape sequence is returned.
660 A negative value means the sequence \ newline was seen,
661 which is supposed to be equivalent to nothing at all.
663 If \ is followed by a null character, we return a negative
664 value and leave the string pointer pointing at the null character.
666 If \ is followed by 000, we return 0 and leave the string pointer
667 after the zeros. A value of 0 does not mean end of string. */
670 cppReader_parseEscape (cppReader *pfile, char **string_ptr)
672 char c = *(*string_ptr)++;
682 if (cppReader_isPedantic (pfile))
684 cppReader_pedwarn (pfile,
685 message ("non-standard escape sequence, `\\%c'", c));
691 return TARGET_NEWLINE;
713 int i = (int) c - '0';
718 c = *(*string_ptr)++;
719 if (c >= '0' && c <= '7')
721 i = ((unsigned) i << 3) + c - '0';
727 /*@loopbreak@*/ break;
730 if ((i & ~((1 << MAX_CHAR_TYPE_SIZE) - 1)) != 0)
732 i &= (1 << MAX_CHAR_TYPE_SIZE) - 1;
733 cppReader_pedwarnLit (pfile,
734 cstring_makeLiteralTemp ("octal character constant does not fit in a byte"));
740 register unsigned i = 0, overflow = 0, digits_found = 0, digit;
743 c = *(*string_ptr)++;
745 if (c >= '0' && c <= '9')
747 digit = (unsigned int) (c - '0');
749 else if (c >= 'a' && c <= 'f')
751 digit = (unsigned int) (c - 'a') + 10;
753 else if (c >= 'A' && c <= 'F')
755 digit = (unsigned int) (c - 'A') + 10;
760 /*@loopbreak@*/ break;
762 overflow |= i ^ (i << 4 >> 4);
763 i = (i << 4) + digit;
767 if (digits_found == 0)
769 cppReader_errorLit (pfile,
770 cstring_makeLiteralTemp ("\\x used with no following hex digits"));
773 if ((overflow | (i & ~((1 << int_toNonNegative (BITS_PER_UNIT)) - 1))) != 0)
775 i &= (1 << BITS_PER_UNIT) - 1;
776 cppReader_pedwarnLit (pfile,
777 cstring_makeLiteralTemp ("hex character constant does not fit in a byte"));
788 integer_overflow (cppReader *pfile)
790 if (cppReader_isPedantic (pfile))
791 cppReader_pedwarnLit (pfile,
792 cstring_makeLiteralTemp ("integer overflow in preprocessor expression"));
796 left_shift (cppReader *pfile, long a, bool unsignedp, unsigned long b)
798 if (b >= HOST_BITS_PER_LONG)
800 if (!unsignedp && a != 0)
802 integer_overflow (pfile);
809 return (unsigned long) a << b;
813 long l = int_toNonNegative (a) << b;
816 # pragma warning( disable : 4018 )
819 if (int_toNonNegative (l) >> b != a)
821 integer_overflow (pfile);
829 right_shift (long a, bool unsignedp, unsigned long b)
831 if (b >= HOST_BITS_PER_LONG)
832 return (unsignedp ? 0 : int_toNonNegative (a) >> (HOST_BITS_PER_LONG - 1));
834 return (unsigned long) a >> b;
836 return int_toNonNegative (a) >> b;
839 /* These priorities are all even, so we can handle associatively. */
841 /*@constant int PAREN_INNER_PRIO@*/
842 #define PAREN_INNER_PRIO 0
844 /*@constant int COMMA_PRIO@*/
847 /*@constant int COND_PRIO@*/
848 #define COND_PRIO (COMMA_PRIO+2)
850 /*@constant int OROR_PRIO@*/
851 #define OROR_PRIO (COND_PRIO+2)
853 /*@constant int ANDAND_PRIO@*/
854 #define ANDAND_PRIO (OROR_PRIO+2)
856 /*@constant int OR_PRIO@*/
857 #define OR_PRIO (ANDAND_PRIO+2)
859 /*@constant int XOR_PRIO@*/
860 #define XOR_PRIO (OR_PRIO+2)
862 /*@constant int AND_PRIO@*/
863 #define AND_PRIO (XOR_PRIO+2)
865 /*@constant int CPP_EQUAL_PRIO@*/
866 #define CPP_EQUAL_PRIO (AND_PRIO+2)
868 /*@constant int LESS_PRIO@*/
869 #define LESS_PRIO (CPP_EQUAL_PRIO+2)
871 /*@constant int SHIFT_PRIO@*/
872 #define SHIFT_PRIO (LESS_PRIO+2)
874 /*@constant int PLUS_PRIO@*/
875 #define PLUS_PRIO (SHIFT_PRIO+2)
877 /*@constant int MUL_PRIO@*/
878 #define MUL_PRIO (PLUS_PRIO+2)
880 /*@constant int UNARY_PRIO@*/
881 #define UNARY_PRIO (MUL_PRIO+2)
883 /*@constant int PAREN_OUTER_PRIO@*/
884 #define PAREN_OUTER_PRIO (UNARY_PRIO+2)
887 #define COMPARE(OP) \
888 top->unsignedp = FALSE;\
889 top->value = ((unsigned1 || unsigned2) \
890 ? (unsigned long) v1 OP (unsigned long) v2 \
891 : ((long) v1 OP (long) v2)) ? 1 : 0
893 /* Parse and evaluate a C expression, reading from PFILE.
894 Returns the value of the expression. */
896 /*@constant int INIT_STACK_SIZE@*/
897 # define INIT_STACK_SIZE 20
900 cppReader_parseExpression (cppReader *pfile)
902 /* The implementation is an operator precedence parser,
903 i.e. a bottom-up parser, using a stack for not-yet-reduced tokens.
905 The stack base is 'stack', and the current stack pointer is 'top'.
906 There is a stack element for each operator (only),
907 and the most recently pushed operator is 'top->op'.
908 An operand (value) is stored in the 'value' field of the stack
909 element of the operator that precedes it.
910 In that case the 'flags' field has the HAVE_VALUE flag set. */
912 struct operation init_stack[INIT_STACK_SIZE];
913 struct operation *stack = init_stack;
914 struct operation *limit = stack + INIT_STACK_SIZE;
915 register struct operation *top = stack;
916 int lprio, rprio = 0;
917 int skip_evaluation = 0;
928 op = cppexp_lex (pfile);
930 /* See if the token is an operand, in which case go to set_value.
931 If the token is an operator, figure out its left and right
932 priorities, and then goto maybe_reduce. */
937 top->value = 0, top->unsignedp = FALSE;
941 top->value = op.value;
942 top->unsignedp = op.unsignedp;
945 lprio = 0; goto maybe_reduce;
947 /* Is this correct if unary ? FIXME */
948 flags = RIGHT_OPERAND_REQUIRED;
949 lprio = PLUS_PRIO; rprio = lprio + 1; goto maybe_reduce;
951 flags = RIGHT_OPERAND_REQUIRED;
952 rprio = UNARY_PRIO; lprio = rprio + 1; goto maybe_reduce;
953 case '*': case '/': case '%':
954 lprio = MUL_PRIO; goto binop;
955 case '<': case '>': case LEQ: case GEQ:
956 lprio = LESS_PRIO; goto binop;
957 case CPP_EQUALTOK: case NOTEQUAL:
958 lprio = CPP_EQUAL_PRIO; goto binop;
960 lprio = SHIFT_PRIO; goto binop;
961 case '&': lprio = AND_PRIO; goto binop;
962 case '^': lprio = XOR_PRIO; goto binop;
963 case '|': lprio = OR_PRIO; goto binop;
964 case ANDAND: lprio = ANDAND_PRIO; goto binop;
965 case OROR: lprio = OROR_PRIO; goto binop;
967 lprio = COMMA_PRIO; goto binop;
969 lprio = PAREN_OUTER_PRIO; rprio = PAREN_INNER_PRIO;
972 lprio = PAREN_INNER_PRIO; rprio = PAREN_OUTER_PRIO;
975 lprio = COND_PRIO; rprio = COND_PRIO;
978 lprio = COND_PRIO + 1; rprio = COND_PRIO;
981 flags = LEFT_OPERAND_REQUIRED | RIGHT_OPERAND_REQUIRED;
987 message ("Invalid character in #if: %c",
993 /* Push a value onto the stack. */
994 if ((top->flags & HAVE_VALUE) != 0)
996 cppReader_errorLit (pfile,
997 cstring_makeLiteralTemp ("syntax error in #if"));
1000 top->flags |= HAVE_VALUE;
1004 /* Push an operator, and check if we can reduce now. */
1005 while (top->rprio > lprio)
1008 HOST_WIDE_INT v1 = top[-1].value;
1009 HOST_WIDE_INT v2 = top[0].value;
1010 bool unsigned1 = top[-1].unsignedp;
1011 bool unsigned2 = top[0].unsignedp;
1015 if (((top[1].flags & LEFT_OPERAND_REQUIRED) != 0)
1016 && ((top[0].flags & HAVE_VALUE) == 0))
1018 cppReader_errorLit (pfile,
1019 cstring_makeLiteralTemp ("syntax error - missing left operand"));
1022 if (((top[1].flags & RIGHT_OPERAND_REQUIRED) != 0)
1023 && ((top[1].flags & HAVE_VALUE) == 0))
1025 cppReader_errorLit (pfile,
1026 cstring_makeLiteralTemp ("syntax error - missing right operand"));
1029 /* top[0].value = (top[1].op)(v1, v2);*/
1033 if ((top->flags & HAVE_VALUE) == 0)
1036 top->unsignedp = unsigned2;
1037 top->flags |= HAVE_VALUE;
1041 top->value = v1 + v2;
1042 top->unsignedp = unsigned1 || unsigned2;
1043 if (!top->unsignedp && (skip_evaluation == 0)
1044 && ! possibleSumSign (v1, v2, top->value))
1045 integer_overflow (pfile);
1047 /*@switchbreak@*/ break;
1049 if ((top->flags & HAVE_VALUE) == 0)
1052 if ((skip_evaluation == 0)
1053 && (top->value & v2) < 0 && !unsigned2)
1054 integer_overflow (pfile);
1055 top->unsignedp = unsigned2;
1056 top->flags |= HAVE_VALUE;
1060 top->value = v1 - v2;
1061 top->unsignedp = unsigned1 || unsigned2;
1062 if (!top->unsignedp && (skip_evaluation == 0)
1063 && !possibleSumSign (top->value, v2, v1))
1065 integer_overflow (pfile);
1068 /*@switchbreak@*/ break;
1070 top->unsignedp = unsigned1 || unsigned2;
1074 top->value = (unsigned long) v1 * v2;
1076 else if (skip_evaluation == 0)
1078 top->value = v1 * v2;
1080 && (top->value / v1 != v2
1081 || (top->value & v1 & v2) < 0))
1083 integer_overflow (pfile);
1091 /*@switchbreak@*/ break;
1093 if (skip_evaluation != 0)
1094 /*@switchbreak@*/ break;
1097 cppReader_errorLit (pfile,
1098 cstring_makeLiteralTemp ("Division by zero in #if"));
1101 top->unsignedp = unsigned1 || unsigned2;
1103 top->value = (unsigned long) v1 / v2;
1106 top->value = v1 / v2;
1107 if ((top->value & v1 & v2) < 0)
1108 integer_overflow (pfile);
1110 /*@switchbreak@*/ break;
1112 if (skip_evaluation != 0)
1113 /*@switchbreak@*/ break;
1116 cppReader_errorLit (pfile,
1117 cstring_makeLiteralTemp ("Division by zero in #if"));
1120 top->unsignedp = unsigned1 || unsigned2;
1122 top->value = (unsigned long) v1 % v2;
1124 top->value = v1 % v2;
1125 /*@switchbreak@*/ break;
1127 if ((top->flags & HAVE_VALUE) != 0)
1129 cppReader_errorLit (pfile,
1130 cstring_makeLiteralTemp ("Syntax error"));
1134 top->value = (v2 == 0) ? 1 : 0;
1135 top->unsignedp = FALSE;
1136 top->flags |= HAVE_VALUE;
1137 /*@switchbreak@*/ break;
1139 if ((top->flags & HAVE_VALUE) != 0)
1141 cppReader_errorLit (pfile,
1142 cstring_makeLiteralTemp ("syntax error"));
1146 top->unsignedp = unsigned2;
1147 top->flags |= HAVE_VALUE;
1148 /*@switchbreak@*/ break;
1149 case '<': COMPARE(<); /*@switchbreak@*/ break;
1150 case '>': COMPARE(>); /*@switchbreak@*/ break;
1151 case LEQ: COMPARE(<=); /*@switchbreak@*/ break;
1152 case GEQ: COMPARE(>=); /*@switchbreak@*/ break;
1154 top->value = (v1 == v2) ? 1 : 0;
1155 top->unsignedp = FALSE;
1156 /*@switchbreak@*/ break;
1158 top->value = (v1 != v2) ? 1 : 0;
1159 top->unsignedp = FALSE;
1160 /*@switchbreak@*/ break;
1162 if (skip_evaluation != 0)
1164 /*@switchbreak@*/ break;
1167 top->unsignedp = unsigned1;
1168 if (v2 < 0 && ! unsigned2)
1169 top->value = right_shift (v1, unsigned1, -v2);
1171 top->value = left_shift (pfile, v1, unsigned1, v2);
1172 /*@switchbreak@*/ break;
1174 if (skip_evaluation != 0)
1176 /*@switchbreak@*/ break;
1178 top->unsignedp = unsigned1;
1179 if (v2 < 0 && ! unsigned2)
1180 top->value = left_shift (pfile, v1, unsigned1, -v2);
1182 top->value = right_shift (v1, unsigned1, v2);
1183 /*@switchbreak@*/ break;
1186 #define LOGICAL(OP) \
1187 top->value = v1 OP v2;\
1188 top->unsignedp = unsigned1 || unsigned2;
1190 case '&': LOGICAL(&); /*@switchbreak@*/ break;
1191 case '^': LOGICAL(^); /*@switchbreak@*/ break;
1192 case '|': LOGICAL(|); /*@switchbreak@*/ break;
1194 top->value = ((v1 != 0) && (v2 != 0)) ? 1 : 0;
1195 top->unsignedp = FALSE;
1201 /*@switchbreak@*/ break;
1203 top->value = ((v1 != 0) || (v2 != 0)) ? 1 : 0;
1204 top->unsignedp = FALSE;
1209 /*@switchbreak@*/ break;
1211 if (cppReader_isPedantic (pfile))
1212 cppReader_pedwarnLit (pfile,
1213 cstring_makeLiteralTemp ("comma operator in operand of `#if'"));
1215 top->unsignedp = unsigned2;
1216 /*@switchbreak@*/ break;
1218 cppReader_errorLit (pfile,
1219 cstring_makeLiteralTemp ("syntax error in #if"));
1222 if (top[0].op != '?')
1224 cppReader_errorLit (pfile,
1225 cstring_makeLiteralTemp ("syntax error ':' without preceding '?'"));
1228 else if (((top[1].flags & HAVE_VALUE) == 0)
1229 || ((top[-1].flags & HAVE_VALUE) == 0)
1230 || ((top[0].flags & HAVE_VALUE) == 0))
1232 cppReader_errorLit (pfile,
1233 cstring_makeLiteralTemp ("bad syntax for ?: operator"));
1239 if (top->value != 0)
1244 top->value = (top->value != 0) ? v1 : v2;
1245 top->unsignedp = unsigned1 || unsigned2;
1247 /*@switchbreak@*/ break;
1249 if (((top[1].flags & HAVE_VALUE) != 0)
1250 || ((top[0].flags & HAVE_VALUE) == 0)
1252 || ((top[-1].flags & HAVE_VALUE) != 0))
1254 cppReader_errorLit (pfile,
1255 cstring_makeLiteralTemp ("mismatched parentheses in #if"));
1262 top->unsignedp = unsigned1;
1263 top->flags |= HAVE_VALUE;
1265 /*@switchbreak@*/ break;
1269 top[1].op >= ' ' && top[1].op <= '~'
1270 ? "unimplemented operator '%c'\n"
1271 : "unimplemented operator '\\%03o'\n",
1282 cppReader_errorLit (pfile,
1283 cstring_makeLiteralTemp ("internal error in #if expression"));
1288 if (stack != init_stack)
1292 } /*@=branchstate@*/
1298 /* Check for and handle stack overflow. */
1301 struct operation *new_stack;
1302 size_t old_size = size_fromInt ((char *) limit - (char *) stack);
1303 size_t new_size = (size_t) (2 * old_size);
1305 if (stack != init_stack)
1307 new_stack = (struct operation *) drealloc ((char *) stack,
1312 new_stack = (struct operation *) dmalloc (new_size);
1314 /* Bug: the parameters were in the wrong order! */
1315 memcpy ((char *) new_stack, (char *) stack, old_size);
1317 } /*@=branchstate@*/
1320 top = (struct operation *) ((char *) new_stack + old_size);
1321 limit = (struct operation *) ((char *) new_stack + new_size);
1323 } /*@=branchstate@*/
1328 if ((op.op == OROR && (top[-1].value != 0))
1329 || (op.op == ANDAND && (top[-1].value == 0))
1330 || (op.op == '?' && (top[-1].value == 0)))
1334 else if (op.op == ':')
1336 if (top[-2].value != 0) /* Was condition true? */
1352 if (stack != init_stack)
1356 } /*@=branchstate@*/
1359 cppReader_skipRestOfLine (pfile);