-/* Parse C expressions for CCCP.
- Copyright (C) 1987, 92, 94, 95, 97, 98, 1999 Free Software Foundation.
+/* Parse C expressions for cpplib.
+ Copyright (C) 1987, 1992, 1994, 1995, 1997, 1998, 1999, 2000, 2001,
+ 2002 Free Software Foundation.
+ Contributed by Per Bothner, 1994.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA.
+Boston, MA 02111-1307, USA. */
- In other words, you are welcome to use, share and improve this program.
- You are forbidden to forbid anyone else to use, share and improve
- what you give them. Help stamp out software-hoarding!
-
-Written by Per Bothner 1994. */
-
-/* Parse a C expression from text in a string */
-
#include "config.h"
#include "system.h"
#include "cpplib.h"
+#include "cpphash.h"
-#ifdef MULTIBYTE_CHARS
-#include <locale.h>
-#endif
-
-#ifndef CHAR_TYPE_SIZE
-#define CHAR_TYPE_SIZE BITS_PER_UNIT
-#endif
-
-#ifndef INT_TYPE_SIZE
-#define INT_TYPE_SIZE BITS_PER_WORD
-#endif
-
-#ifndef LONG_TYPE_SIZE
-#define LONG_TYPE_SIZE BITS_PER_WORD
-#endif
-
-#ifndef WCHAR_TYPE_SIZE
-#define WCHAR_TYPE_SIZE INT_TYPE_SIZE
-#endif
-
-#ifndef MAX_CHAR_TYPE_SIZE
-#define MAX_CHAR_TYPE_SIZE CHAR_TYPE_SIZE
-#endif
-
-#ifndef MAX_INT_TYPE_SIZE
-#define MAX_INT_TYPE_SIZE INT_TYPE_SIZE
-#endif
-
-#ifndef MAX_LONG_TYPE_SIZE
-#define MAX_LONG_TYPE_SIZE LONG_TYPE_SIZE
-#endif
-
-#ifndef MAX_WCHAR_TYPE_SIZE
-#define MAX_WCHAR_TYPE_SIZE WCHAR_TYPE_SIZE
-#endif
-
-#define MAX_CHAR_TYPE_MASK (MAX_CHAR_TYPE_SIZE < HOST_BITS_PER_WIDEST_INT \
- ? (~ (~ (HOST_WIDEST_INT) 0 << MAX_CHAR_TYPE_SIZE)) \
- : ~ (HOST_WIDEST_INT) 0)
-
-#define MAX_WCHAR_TYPE_MASK (MAX_WCHAR_TYPE_SIZE < HOST_BITS_PER_WIDEST_INT \
- ? ~ (~ (HOST_WIDEST_INT) 0 << MAX_WCHAR_TYPE_SIZE) \
- : ~ (HOST_WIDEST_INT) 0)
-
-/* Yield nonzero if adding two numbers with A's and B's signs can yield a
- number with SUM's sign, where A, B, and SUM are all C integers. */
-#define possible_sum_sign(a, b, sum) ((((a) ^ (b)) | ~ ((a) ^ (sum))) < 0)
-
-static void integer_overflow PARAMS ((cpp_reader *));
-static HOST_WIDEST_INT left_shift PARAMS ((cpp_reader *, HOST_WIDEST_INT, int, unsigned HOST_WIDEST_INT));
-static HOST_WIDEST_INT right_shift PARAMS ((cpp_reader *, HOST_WIDEST_INT, int, unsigned HOST_WIDEST_INT));
-
-#define ERROR 299
-#define OROR 300
-#define ANDAND 301
-#define EQUAL 302
-#define NOTEQUAL 303
-#define LEQ 304
-#define GEQ 305
-#define LSH 306
-#define RSH 307
-#define NAME 308
-#define INT 309
-#define CHAR 310
-
-#define LEFT_OPERAND_REQUIRED 1
-#define RIGHT_OPERAND_REQUIRED 2
-#define HAVE_VALUE 4
-/* SKIP_OPERAND is set for '&&' '||' '?' and ':' when the
- following operand should be short-circuited instead of evaluated. */
-#define SKIP_OPERAND 8
-/*#define UNSIGNEDP 16*/
-
-struct operation {
- short op;
- char rprio; /* Priority of op (relative to it right operand). */
- char flags;
- char unsignedp; /* true if value should be treated as unsigned */
- HOST_WIDEST_INT value; /* The value logically "right" of op. */
+#define PART_PRECISION (sizeof (cpp_num_part) * CHAR_BIT)
+#define HALF_MASK (~(cpp_num_part) 0 >> (PART_PRECISION / 2))
+#define LOW_PART(num_part) (num_part & HALF_MASK)
+#define HIGH_PART(num_part) (num_part >> (PART_PRECISION / 2))
+
+struct op
+{
+ const cpp_token *token; /* The token forming op (for diagnostics). */
+ cpp_num value; /* The value logically "right" of op. */
+ enum cpp_ttype op;
};
-/* Parse and convert an integer for #if. Accepts decimal, hex, or octal
- with or without size suffixes. */
+/* Some simple utility routines on double integers. */
+#define num_zerop(num) ((num.low | num.high) == 0)
+#define num_eq(num1, num2) (num1.low == num2.low && num1.high == num2.high)
+static bool num_positive (cpp_num, size_t);
+static bool num_greater_eq (cpp_num, cpp_num, size_t);
+static cpp_num num_trim (cpp_num, size_t);
+static cpp_num num_part_mul (cpp_num_part, cpp_num_part);
+
+static cpp_num num_unary_op (cpp_reader *, cpp_num, enum cpp_ttype);
+static cpp_num num_binary_op (cpp_reader *, cpp_num, cpp_num, enum cpp_ttype);
+static cpp_num num_negate (cpp_num, size_t);
+static cpp_num num_bitwise_op (cpp_reader *, cpp_num, cpp_num, enum cpp_ttype);
+static cpp_num num_inequality_op (cpp_reader *, cpp_num, cpp_num,
+ enum cpp_ttype);
+static cpp_num num_equality_op (cpp_reader *, cpp_num, cpp_num,
+ enum cpp_ttype);
+static cpp_num num_mul (cpp_reader *, cpp_num, cpp_num);
+static cpp_num num_div_op (cpp_reader *, cpp_num, cpp_num, enum cpp_ttype);
+static cpp_num num_lshift (cpp_num, size_t, size_t);
+static cpp_num num_rshift (cpp_num, size_t, size_t);
+
+static cpp_num append_digit (cpp_num, int, int, size_t);
+static cpp_num parse_defined (cpp_reader *);
+static cpp_num eval_token (cpp_reader *, const cpp_token *);
+static struct op *reduce (cpp_reader *, struct op *, enum cpp_ttype);
+static unsigned int interpret_float_suffix (const uchar *, size_t);
+static unsigned int interpret_int_suffix (const uchar *, size_t);
+static void check_promotion (cpp_reader *, const struct op *);
+
+/* Token type abuse to create unary plus and minus operators. */
+#define CPP_UPLUS (CPP_LAST_CPP_OP + 1)
+#define CPP_UMINUS (CPP_LAST_CPP_OP + 2)
+
+/* With -O2, gcc appears to produce nice code, moving the error
+ message load and subsequent jump completely out of the main path. */
+#define SYNTAX_ERROR(msgid) \
+ do { cpp_error (pfile, DL_ERROR, msgid); goto syntax_error; } while(0)
+#define SYNTAX_ERROR2(msgid, arg) \
+ do { cpp_error (pfile, DL_ERROR, msgid, arg); goto syntax_error; } while(0)
+
+/* Subroutine of cpp_classify_number. S points to a float suffix of
+ length LEN, possibly zero. Returns 0 for an invalid suffix, or a
+ flag vector describing the suffix. */
+static unsigned int
+interpret_float_suffix (const uchar *s, size_t len)
+{
+ size_t f = 0, l = 0, i = 0;
-static struct operation
-parse_number (pfile, start, end)
- cpp_reader *pfile;
- U_CHAR *start;
- U_CHAR *end;
+ while (len--)
+ switch (s[len])
+ {
+ case 'f': case 'F': f++; break;
+ case 'l': case 'L': l++; break;
+ case 'i': case 'I':
+ case 'j': case 'J': i++; break;
+ default:
+ return 0;
+ }
+
+ if (f + l > 1 || i > 1)
+ return 0;
+
+ return ((i ? CPP_N_IMAGINARY : 0)
+ | (f ? CPP_N_SMALL :
+ l ? CPP_N_LARGE : CPP_N_MEDIUM));
+}
+
+/* Subroutine of cpp_classify_number. S points to an integer suffix
+ of length LEN, possibly zero. Returns 0 for an invalid suffix, or a
+ flag vector describing the suffix. */
+static unsigned int
+interpret_int_suffix (const uchar *s, size_t len)
{
- struct operation op;
- U_CHAR *p = start;
- int c;
- unsigned HOST_WIDEST_INT n = 0, nd, MAX_over_base;
- int base = 10;
- int overflow = 0;
- int digit, largest_digit = 0;
- int spec_long = 0;
-
- op.unsignedp = 0;
-
- if (p[0] == '0')
+ size_t u, l, i;
+
+ u = l = i = 0;
+
+ while (len--)
+ switch (s[len])
+ {
+ case 'u': case 'U': u++; break;
+ case 'i': case 'I':
+ case 'j': case 'J': i++; break;
+ case 'l': case 'L': l++;
+ /* If there are two Ls, they must be adjacent and the same case. */
+ if (l == 2 && s[len] != s[len + 1])
+ return 0;
+ break;
+ default:
+ return 0;
+ }
+
+ if (l > 2 || u > 1 || i > 1)
+ return 0;
+
+ return ((i ? CPP_N_IMAGINARY : 0)
+ | (u ? CPP_N_UNSIGNED : 0)
+ | ((l == 0) ? CPP_N_SMALL
+ : (l == 1) ? CPP_N_MEDIUM : CPP_N_LARGE));
+}
+
+/* Categorize numeric constants according to their field (integer,
+ floating point, or invalid), radix (decimal, octal, hexadecimal),
+ and type suffixes. */
+unsigned int
+cpp_classify_number (cpp_reader *pfile, const cpp_token *token)
+{
+ const uchar *str = token->val.str.text;
+ const uchar *limit;
+ unsigned int max_digit, result, radix;
+ enum {NOT_FLOAT = 0, AFTER_POINT, AFTER_EXPON} float_flag;
+
+ /* If the lexer has done its job, length one can only be a single
+ digit. Fast-path this very common case. */
+ if (token->val.str.len == 1)
+ return CPP_N_INTEGER | CPP_N_SMALL | CPP_N_DECIMAL;
+
+ limit = str + token->val.str.len;
+ float_flag = NOT_FLOAT;
+ max_digit = 0;
+ radix = 10;
+
+ /* First, interpret the radix. */
+ if (*str == '0')
{
- if (end - start >= 3 && (p[1] == 'x' || p[1] == 'X'))
- {
- p += 2;
- base = 16;
- }
- else
+ radix = 8;
+ str++;
+
+ /* Require at least one hex digit to classify it as hex. */
+ if ((*str == 'x' || *str == 'X')
+ && (str[1] == '.' || ISXDIGIT (str[1])))
{
- p += 1;
- base = 8;
+ radix = 16;
+ str++;
}
}
- /* Some buggy compilers (e.g. MPW C) seem to need both casts. */
- MAX_over_base = (((unsigned HOST_WIDEST_INT) -1)
- / ((unsigned HOST_WIDEST_INT) base));
-
- while (p < end)
+ /* Now scan for a well-formed integer or float. */
+ for (;;)
{
- c = *p++;
-
- if (c >= '0' && c <= '9')
- digit = c - '0';
- else if (base == 16 && c >= 'a' && c <= 'f') /* FIXME: assumes ASCII */
- digit = c - 'a' + 10;
- else if (base == 16 && c >= 'A' && c <= 'F')
- digit = c - 'A' + 10;
+ unsigned int c = *str++;
+
+ if (ISDIGIT (c) || (ISXDIGIT (c) && radix == 16))
+ {
+ c = hex_value (c);
+ if (c > max_digit)
+ max_digit = c;
+ }
else if (c == '.')
{
- /* It's a float since it contains a point. */
- cpp_error (pfile,
- "floating point numbers are not allowed in #if expressions");
- goto error;
+ if (float_flag == NOT_FLOAT)
+ float_flag = AFTER_POINT;
+ else
+ SYNTAX_ERROR ("too many decimal points in number");
+ }
+ else if ((radix <= 10 && (c == 'e' || c == 'E'))
+ || (radix == 16 && (c == 'p' || c == 'P')))
+ {
+ float_flag = AFTER_EXPON;
+ break;
}
else
{
- /* `l' means long, and `u' means unsigned. */
- for (;;)
- {
- if (c == 'l' || c == 'L')
- spec_long++;
- else if (c == 'u' || c == 'U')
- op.unsignedp++;
- else
- {
- /* Decrement p here so that the error for an invalid number
- will be generated below in the case where this is the
- last character in the buffer. */
- p--;
- break;
- }
- if (p == end)
- break;
- c = *p++;
- }
- /* Don't look for any more digits after the suffixes. */
+ /* Start of suffix. */
+ str--;
break;
}
-
- if (largest_digit < digit)
- largest_digit = digit;
- nd = n * base + digit;
- overflow |= MAX_over_base < n || nd < n;
- n = nd;
}
- if (p != end)
- {
- cpp_error (pfile, "invalid number in #if expression");
- goto error;
- }
- else if (spec_long > (CPP_OPTIONS (pfile)->c89 ? 1 : 2))
+ if (float_flag != NOT_FLOAT && radix == 8)
+ radix = 10;
+
+ if (max_digit >= radix)
+ SYNTAX_ERROR2 ("invalid digit \"%c\" in octal constant", '0' + max_digit);
+
+ if (float_flag != NOT_FLOAT)
{
- cpp_error (pfile, "too many `l' suffixes in integer constant");
- goto error;
+ if (radix == 16 && CPP_PEDANTIC (pfile) && !CPP_OPTION (pfile, c99))
+ cpp_error (pfile, DL_PEDWARN,
+ "use of C99 hexadecimal floating constant");
+
+ if (float_flag == AFTER_EXPON)
+ {
+ if (*str == '+' || *str == '-')
+ str++;
+
+ /* Exponent is decimal, even if string is a hex float. */
+ if (!ISDIGIT (*str))
+ SYNTAX_ERROR ("exponent has no digits");
+
+ do
+ str++;
+ while (ISDIGIT (*str));
+ }
+ else if (radix == 16)
+ SYNTAX_ERROR ("hexadecimal floating constants require an exponent");
+
+ result = interpret_float_suffix (str, limit - str);
+ if (result == 0)
+ {
+ cpp_error (pfile, DL_ERROR,
+ "invalid suffix \"%.*s\" on floating constant",
+ (int) (limit - str), str);
+ return CPP_N_INVALID;
+ }
+
+ /* Traditional C didn't accept any floating suffixes. */
+ if (limit != str
+ && CPP_WTRADITIONAL (pfile)
+ && ! cpp_sys_macro_p (pfile))
+ cpp_error (pfile, DL_WARNING,
+ "traditional C rejects the \"%.*s\" suffix",
+ (int) (limit - str), str);
+
+ result |= CPP_N_FLOATING;
}
- else if (op.unsignedp > 1)
+ else
{
- cpp_error (pfile, "too many `u' suffixes in integer constant");
- goto error;
- }
-
- if (base <= largest_digit)
- cpp_pedwarn (pfile, "integer constant contains digits beyond the radix");
+ result = interpret_int_suffix (str, limit - str);
+ if (result == 0)
+ {
+ cpp_error (pfile, DL_ERROR,
+ "invalid suffix \"%.*s\" on integer constant",
+ (int) (limit - str), str);
+ return CPP_N_INVALID;
+ }
- if (overflow)
- cpp_pedwarn (pfile, "integer constant out of range");
+ /* Traditional C only accepted the 'L' suffix.
+ Suppress warning about 'LL' with -Wno-long-long. */
+ if (CPP_WTRADITIONAL (pfile) && ! cpp_sys_macro_p (pfile))
+ {
+ int u_or_i = (result & (CPP_N_UNSIGNED|CPP_N_IMAGINARY));
+ int large = (result & CPP_N_WIDTH) == CPP_N_LARGE;
- /* If too big to be signed, consider it unsigned. */
- else if ((HOST_WIDEST_INT) n < 0 && ! op.unsignedp)
- {
- if (base == 10)
- cpp_warning (pfile,
- "integer constant is so large that it is unsigned");
- op.unsignedp = 1;
+ if (u_or_i || (large && CPP_OPTION (pfile, warn_long_long)))
+ cpp_error (pfile, DL_WARNING,
+ "traditional C rejects the \"%.*s\" suffix",
+ (int) (limit - str), str);
+ }
+
+ if ((result & CPP_N_WIDTH) == CPP_N_LARGE
+ && ! CPP_OPTION (pfile, c99)
+ && CPP_OPTION (pfile, warn_long_long))
+ cpp_error (pfile, DL_PEDWARN, "use of C99 long long integer constant");
+
+ result |= CPP_N_INTEGER;
}
- op.value = n;
- op.op = INT;
- return op;
+ if ((result & CPP_N_IMAGINARY) && CPP_PEDANTIC (pfile))
+ cpp_error (pfile, DL_PEDWARN, "imaginary constants are a GCC extension");
- error:
- op.op = ERROR;
- return op;
+ if (radix == 10)
+ result |= CPP_N_DECIMAL;
+ else if (radix == 16)
+ result |= CPP_N_HEX;
+ else
+ result |= CPP_N_OCTAL;
+
+ return result;
+
+ syntax_error:
+ return CPP_N_INVALID;
}
-/* Parse and convert a character constant for #if. Understands backslash
- escapes (\n, \031) and multibyte characters (if so configured). */
-static struct operation
-parse_charconst (pfile, start, end)
- cpp_reader *pfile;
- U_CHAR *start;
- U_CHAR *end;
+/* cpp_interpret_integer converts an integer constant into a cpp_num,
+ of precision options->precision.
+
+ We do not provide any interface for decimal->float conversion,
+ because the preprocessor doesn't need it and we don't want to
+ drag in GCC's floating point emulator. */
+cpp_num
+cpp_interpret_integer (cpp_reader *pfile, const cpp_token *token,
+ unsigned int type)
{
- struct operation op;
- HOST_WIDEST_INT result = 0;
- int num_chars = 0;
- int num_bits;
- unsigned int width = MAX_CHAR_TYPE_SIZE, mask = MAX_CHAR_TYPE_MASK;
- int max_chars;
- U_CHAR *ptr = start;
-
- /* FIXME: Should use reentrant multibyte functions. */
-#ifdef MULTIBYTE_CHARS
- wchar_t c = (wchar_t)-1;
- (void) mbtowc (NULL_PTR, NULL_PTR, 0);
-#else
- int c = -1;
-#endif
-
- if (*ptr == 'L')
- {
- ++ptr;
- width = MAX_WCHAR_TYPE_SIZE, mask = MAX_WCHAR_TYPE_MASK;
- }
- max_chars = MAX_LONG_TYPE_SIZE / width;
+ const uchar *p, *end;
+ cpp_num result;
- ++ptr; /* skip initial quote */
+ result.low = 0;
+ result.high = 0;
+ result.unsignedp = !!(type & CPP_N_UNSIGNED);
+ result.overflow = false;
- while (ptr < end)
+ p = token->val.str.text;
+ end = p + token->val.str.len;
+
+ /* Common case of a single digit. */
+ if (token->val.str.len == 1)
+ result.low = p[0] - '0';
+ else
{
-#ifndef MULTIBYTE_CHARS
- c = *ptr++;
-#else
- ptr += mbtowc (&c, ptr, end - ptr);
-#endif
- if (c == '\'' || c == '\0')
- break;
- else if (c == '\\')
+ cpp_num_part max;
+ size_t precision = CPP_OPTION (pfile, precision);
+ unsigned int base = 10, c = 0;
+ bool overflow = false;
+
+ if ((type & CPP_N_RADIX) == CPP_N_OCTAL)
+ {
+ base = 8;
+ p++;
+ }
+ else if ((type & CPP_N_RADIX) == CPP_N_HEX)
{
- /* Hopefully valid assumption: if mbtowc returns a backslash,
- we are in initial shift state. No valid escape-sequence
- character can take us out of initial shift state or begin
- an unshifted multibyte char, so cpp_parse_escape doesn't
- need to know about multibyte chars. */
-
- c = cpp_parse_escape (pfile, (char **) &ptr, mask);
- if (width < HOST_BITS_PER_INT
- && (unsigned int) c >= (unsigned int)(1 << width))
- cpp_pedwarn (pfile, "escape sequence out of range for character");
+ base = 16;
+ p += 2;
}
-
- /* Merge character into result; ignore excess chars. */
- if (++num_chars <= max_chars)
+
+ /* We can add a digit to numbers strictly less than this without
+ needing the precision and slowness of double integers. */
+ max = ~(cpp_num_part) 0;
+ if (precision < PART_PRECISION)
+ max >>= PART_PRECISION - precision;
+ max = (max - base + 1) / base + 1;
+
+ for (; p < end; p++)
{
- if (width < HOST_BITS_PER_INT)
- result = (result << width) | (c & ((1 << width) - 1));
+ c = *p;
+
+ if (ISDIGIT (c) || (base == 16 && ISXDIGIT (c)))
+ c = hex_value (c);
else
- result = c;
+ break;
+
+ /* Strict inequality for when max is set to zero. */
+ if (result.low < max)
+ result.low = result.low * base + c;
+ else
+ {
+ result = append_digit (result, c, base, precision);
+ overflow |= result.overflow;
+ max = 0;
+ }
+ }
+
+ if (overflow)
+ cpp_error (pfile, DL_PEDWARN,
+ "integer constant is too large for its type");
+ /* If too big to be signed, consider it unsigned. Only warn for
+ decimal numbers. Traditional numbers were always signed (but
+ we still honor an explicit U suffix); but we only have
+ traditional semantics in directives. */
+ else if (!result.unsignedp
+ && !(CPP_OPTION (pfile, traditional)
+ && pfile->state.in_directive)
+ && !num_positive (result, precision))
+ {
+ if (base == 10)
+ cpp_error (pfile, DL_WARNING,
+ "integer constant is so large that it is unsigned");
+ result.unsignedp = true;
}
}
- if (num_chars == 0)
+ return result;
+}
+
+/* Append DIGIT to NUM, a number of PRECISION bits being read in base BASE. */
+static cpp_num
+append_digit (cpp_num num, int digit, int base, size_t precision)
+{
+ cpp_num result;
+ unsigned int shift = 3 + (base == 16);
+ bool overflow;
+ cpp_num_part add_high, add_low;
+
+ /* Multiply by 8 or 16. Catching this overflow here means we don't
+ need to worry about add_high overflowing. */
+ overflow = !!(num.high >> (PART_PRECISION - shift));
+ result.high = num.high << shift;
+ result.low = num.low << shift;
+ result.high |= num.low >> (PART_PRECISION - shift);
+
+ if (base == 10)
{
- cpp_error (pfile, "empty character constant");
- goto error;
+ add_low = num.low << 1;
+ add_high = (num.high << 1) + (num.low >> (PART_PRECISION - 1));
}
- else if (c != '\'')
+ else
+ add_high = add_low = 0;
+
+ if (add_low + digit < add_low)
+ add_high++;
+ add_low += digit;
+
+ if (result.low + add_low < result.low)
+ add_high++;
+ if (result.high + add_high < result.high)
+ overflow = true;
+
+ result.low += add_low;
+ result.high += add_high;
+
+ /* The above code catches overflow of a cpp_num type. This catches
+ overflow of the (possibly shorter) target precision. */
+ num.low = result.low;
+ num.high = result.high;
+ result = num_trim (result, precision);
+ if (!num_eq (result, num))
+ overflow = true;
+
+ result.unsignedp = num.unsignedp;
+ result.overflow = overflow;
+ return result;
+}
+
+/* Handle meeting "defined" in a preprocessor expression. */
+static cpp_num
+parse_defined (cpp_reader *pfile)
+{
+ cpp_num result;
+ int paren = 0;
+ cpp_hashnode *node = 0;
+ const cpp_token *token;
+ cpp_context *initial_context = pfile->context;
+
+ /* Don't expand macros. */
+ pfile->state.prevent_expansion++;
+
+ token = cpp_get_token (pfile);
+ if (token->type == CPP_OPEN_PAREN)
{
- /* cpp_get_token has already emitted an error if !traditional. */
- if (! CPP_TRADITIONAL (pfile))
- cpp_error (pfile, "malformatted character constant");
- goto error;
+ paren = 1;
+ token = cpp_get_token (pfile);
}
- else if (num_chars > max_chars)
+
+ if (token->type == CPP_NAME)
{
- cpp_error (pfile, "character constant too long");
- goto error;
+ node = token->val.node;
+ if (paren && cpp_get_token (pfile)->type != CPP_CLOSE_PAREN)
+ {
+ cpp_error (pfile, DL_ERROR, "missing ')' after \"defined\"");
+ node = 0;
+ }
}
- else if (num_chars != 1 && ! CPP_TRADITIONAL (pfile))
- cpp_warning (pfile, "multi-character character constant");
-
- /* If char type is signed, sign-extend the constant. */
- num_bits = num_chars * width;
-
- if (cpp_lookup (pfile, (U_CHAR *)"__CHAR_UNSIGNED__",
- sizeof ("__CHAR_UNSIGNED__")-1, -1)
- || ((result >> (num_bits - 1)) & 1) == 0)
- op.value = result & ((unsigned HOST_WIDEST_INT) ~0
- >> (HOST_BITS_PER_WIDEST_INT - num_bits));
else
- op.value = result | ~((unsigned HOST_WIDEST_INT) ~0
- >> (HOST_BITS_PER_WIDEST_INT - num_bits));
-
- /* This is always a signed type. */
- op.unsignedp = 0;
- op.op = CHAR;
- return op;
+ {
+ cpp_error (pfile, DL_ERROR,
+ "operator \"defined\" requires an identifier");
+ if (token->flags & NAMED_OP)
+ {
+ cpp_token op;
+
+ op.flags = 0;
+ op.type = token->type;
+ cpp_error (pfile, DL_ERROR,
+ "(\"%s\" is an alternative token for \"%s\" in C++)",
+ cpp_token_as_text (pfile, token),
+ cpp_token_as_text (pfile, &op));
+ }
+ }
- error:
- op.op = ERROR;
- return op;
-}
+ if (node)
+ {
+ if (pfile->context != initial_context && CPP_PEDANTIC (pfile))
+ cpp_error (pfile, DL_WARNING,
+ "this use of \"defined\" may not be portable");
+ _cpp_mark_macro_used (node);
-struct token {
- char *operator;
- int token;
-};
+ /* A possible controlling macro of the form #if !defined ().
+ _cpp_parse_expr checks there was no other junk on the line. */
+ pfile->mi_ind_cmacro = node;
+ }
-static struct token tokentab2[] = {
- {"&&", ANDAND},
- {"||", OROR},
- {"<<", LSH},
- {">>", RSH},
- {"==", EQUAL},
- {"!=", NOTEQUAL},
- {"<=", LEQ},
- {">=", GEQ},
- {"++", ERROR},
- {"--", ERROR},
- {NULL, ERROR}
-};
+ pfile->state.prevent_expansion--;
-/* Read one token. */
+ result.unsignedp = false;
+ result.high = 0;
+ result.overflow = false;
+ result.low = node && node->type == NT_MACRO;
+ return result;
+}
-static struct operation
-cpp_lex (pfile, skip_evaluation)
- cpp_reader *pfile;
- int skip_evaluation;
+/* Convert a token into a CPP_NUMBER (an interpreted preprocessing
+ number or character constant, or the result of the "defined" or "#"
+ operators). */
+static cpp_num
+eval_token (cpp_reader *pfile, const cpp_token *token)
{
- U_CHAR c;
- struct token *toktab;
- enum cpp_token token;
- struct operation op;
- U_CHAR *tok_start, *tok_end;
- int old_written;
-
- retry:
-
- old_written = CPP_WRITTEN (pfile);
- cpp_skip_hspace (pfile);
- c = CPP_BUF_PEEK (CPP_BUFFER (pfile));
- if (c == '#')
- {
- op.op = INT;
- op.value = cpp_read_check_assertion (pfile);
- return op;
- }
+ cpp_num result;
+ unsigned int temp;
+ int unsignedp = 0;
- if (c == '\n')
+ switch (token->type)
{
- op.op = 0;
- return op;
- }
-
- token = cpp_get_token (pfile);
- tok_start = pfile->token_buffer + old_written;
- tok_end = CPP_PWRITTEN (pfile);
- pfile->limit = tok_start;
- switch (token)
- {
- case CPP_EOF: /* Should not happen ... */
- case CPP_VSPACE:
- op.op = 0;
- return op;
- case CPP_POP:
- if (CPP_BUFFER (pfile)->fname != NULL)
+ case CPP_NUMBER:
+ temp = cpp_classify_number (pfile, token);
+ switch (temp & CPP_N_CATEGORY)
{
- op.op = 0;
- return op;
+ case CPP_N_FLOATING:
+ cpp_error (pfile, DL_ERROR,
+ "floating constant in preprocessor expression");
+ break;
+ case CPP_N_INTEGER:
+ if (!(temp & CPP_N_IMAGINARY))
+ return cpp_interpret_integer (pfile, token, temp);
+ cpp_error (pfile, DL_ERROR,
+ "imaginary number in preprocessor expression");
+ break;
+
+ case CPP_N_INVALID:
+ /* Error already issued. */
+ break;
}
- cpp_pop_buffer (pfile);
- goto retry;
- case CPP_HSPACE:
- case CPP_COMMENT:
- goto retry;
- case CPP_NUMBER:
- return parse_number (pfile, tok_start, tok_end);
- case CPP_STRING:
- cpp_error (pfile, "string constants not allowed in #if expressions");
- op.op = ERROR;
- return op;
+ result.high = result.low = 0;
+ break;
+
+ case CPP_WCHAR:
case CPP_CHAR:
- return parse_charconst (pfile, tok_start, tok_end);
+ {
+ cppchar_t cc = cpp_interpret_charconst (pfile, token,
+ &temp, &unsignedp);
+
+ result.high = 0;
+ result.low = cc;
+ /* Sign-extend the result if necessary. */
+ if (!unsignedp && (cppchar_signed_t) cc < 0)
+ {
+ if (PART_PRECISION > BITS_PER_CPPCHAR_T)
+ result.low |= ~(~(cpp_num_part) 0
+ >> (PART_PRECISION - BITS_PER_CPPCHAR_T));
+ result.high = ~(cpp_num_part) 0;
+ result = num_trim (result, CPP_OPTION (pfile, precision));
+ }
+ }
+ break;
case CPP_NAME:
- op.op = INT;
- op.unsignedp = 0;
- op.value = 0;
- if (strcmp (tok_start, "defined"))
+ if (token->val.node == pfile->spec_nodes.n_defined)
+ return parse_defined (pfile);
+ else if (CPP_OPTION (pfile, cplusplus)
+ && (token->val.node == pfile->spec_nodes.n_true
+ || token->val.node == pfile->spec_nodes.n_false))
{
- if (CPP_WARN_UNDEF (pfile) && !skip_evaluation)
- cpp_warning (pfile, "`%.*s' is not defined",
- (int) (tok_end - tok_start), tok_start);
+ result.high = 0;
+ result.low = (token->val.node == pfile->spec_nodes.n_true);
}
else
{
- int paren = 0, len;
- cpp_buffer *ip = CPP_BUFFER (pfile);
- U_CHAR *tok;
+ result.high = 0;
+ result.low = 0;
+ if (CPP_OPTION (pfile, warn_undef) && !pfile->state.skip_eval)
+ cpp_error (pfile, DL_WARNING, "\"%s\" is not defined",
+ NODE_NAME (token->val.node));
+ }
+ break;
- cpp_skip_hspace (pfile);
- if (*ip->cur == '(')
- {
- paren++;
- ip->cur++; /* Skip over the paren */
- cpp_skip_hspace (pfile);
- }
+ default: /* CPP_HASH */
+ _cpp_test_assertion (pfile, &temp);
+ result.high = 0;
+ result.low = temp;
+ }
- if (!is_idstart[*ip->cur])
- goto oops;
- if (ip->cur[0] == 'L' && (ip->cur[1] == '\'' || ip->cur[1] == '"'))
- goto oops;
- tok = ip->cur;
- while (is_idchar[*ip->cur])
- ++ip->cur;
- len = ip->cur - tok;
- cpp_skip_hspace (pfile);
- if (paren)
+ result.unsignedp = !!unsignedp;
+ result.overflow = false;
+ return result;
+}
+\f
+/* Operator precedence and flags table.
+
+After an operator is returned from the lexer, if it has priority less
+than the operator on the top of the stack, we reduce the stack by one
+operator and repeat the test. Since equal priorities do not reduce,
+this is naturally right-associative.
+
+We handle left-associative operators by decrementing the priority of
+just-lexed operators by one, but retaining the priority of operators
+already on the stack.
+
+The remaining cases are '(' and ')'. We handle '(' by skipping the
+reduction phase completely. ')' is given lower priority than
+everything else, including '(', effectively forcing a reduction of the
+parenthesized expression. If there is a matching '(', the routine
+reduce() exits immediately. If the normal exit route sees a ')', then
+there cannot have been a matching '(' and an error message is output.
+
+The parser assumes all shifted operators require a left operand unless
+the flag NO_L_OPERAND is set. These semantics are automatic; any
+extra semantics need to be handled with operator-specific code. */
+
+/* Flags. If CHECK_PROMOTION, we warn if the effective sign of an
+ operand changes because of integer promotions. */
+#define NO_L_OPERAND (1 << 0)
+#define LEFT_ASSOC (1 << 1)
+#define CHECK_PROMOTION (1 << 2)
+
+/* Operator to priority map. Must be in the same order as the first
+ N entries of enum cpp_ttype. */
+static const struct operator
+{
+ uchar prio;
+ uchar flags;
+} optab[] =
+{
+ /* EQ */ {0, 0}, /* Shouldn't happen. */
+ /* NOT */ {16, NO_L_OPERAND},
+ /* GREATER */ {12, LEFT_ASSOC | CHECK_PROMOTION},
+ /* LESS */ {12, LEFT_ASSOC | CHECK_PROMOTION},
+ /* PLUS */ {14, LEFT_ASSOC | CHECK_PROMOTION},
+ /* MINUS */ {14, LEFT_ASSOC | CHECK_PROMOTION},
+ /* MULT */ {15, LEFT_ASSOC | CHECK_PROMOTION},
+ /* DIV */ {15, LEFT_ASSOC | CHECK_PROMOTION},
+ /* MOD */ {15, LEFT_ASSOC | CHECK_PROMOTION},
+ /* AND */ {9, LEFT_ASSOC | CHECK_PROMOTION},
+ /* OR */ {7, LEFT_ASSOC | CHECK_PROMOTION},
+ /* XOR */ {8, LEFT_ASSOC | CHECK_PROMOTION},
+ /* RSHIFT */ {13, LEFT_ASSOC},
+ /* LSHIFT */ {13, LEFT_ASSOC},
+
+ /* MIN */ {10, LEFT_ASSOC | CHECK_PROMOTION},
+ /* MAX */ {10, LEFT_ASSOC | CHECK_PROMOTION},
+
+ /* COMPL */ {16, NO_L_OPERAND},
+ /* AND_AND */ {6, LEFT_ASSOC},
+ /* OR_OR */ {5, LEFT_ASSOC},
+ /* QUERY */ {3, 0},
+ /* COLON */ {4, LEFT_ASSOC | CHECK_PROMOTION},
+ /* COMMA */ {2, LEFT_ASSOC},
+ /* OPEN_PAREN */ {1, NO_L_OPERAND},
+ /* CLOSE_PAREN */ {0, 0},
+ /* EOF */ {0, 0},
+ /* EQ_EQ */ {11, LEFT_ASSOC},
+ /* NOT_EQ */ {11, LEFT_ASSOC},
+ /* GREATER_EQ */ {12, LEFT_ASSOC | CHECK_PROMOTION},
+ /* LESS_EQ */ {12, LEFT_ASSOC | CHECK_PROMOTION},
+ /* UPLUS */ {16, NO_L_OPERAND},
+ /* UMINUS */ {16, NO_L_OPERAND}
+};
+
+/* Parse and evaluate a C expression, reading from PFILE.
+ Returns the truth value of the expression.
+
+ The implementation is an operator precedence parser, i.e. a
+ bottom-up parser, using a stack for not-yet-reduced tokens.
+
+ The stack base is op_stack, and the current stack pointer is 'top'.
+ There is a stack element for each operator (only), and the most
+ recently pushed operator is 'top->op'. An operand (value) is
+ stored in the 'value' field of the stack element of the operator
+ that precedes it. */
+bool
+_cpp_parse_expr (cpp_reader *pfile)
+{
+ struct op *top = pfile->op_stack;
+ unsigned int lex_count;
+ bool saw_leading_not, want_value = true;
+
+ pfile->state.skip_eval = 0;
+
+ /* Set up detection of #if ! defined(). */
+ pfile->mi_ind_cmacro = 0;
+ saw_leading_not = false;
+ lex_count = 0;
+
+ /* Lowest priority operator prevents further reductions. */
+ top->op = CPP_EOF;
+
+ for (;;)
+ {
+ struct op op;
+
+ lex_count++;
+ op.token = cpp_get_token (pfile);
+ op.op = op.token->type;
+
+ switch (op.op)
+ {
+ /* These tokens convert into values. */
+ case CPP_NUMBER:
+ case CPP_CHAR:
+ case CPP_WCHAR:
+ case CPP_NAME:
+ case CPP_HASH:
+ if (!want_value)
+ SYNTAX_ERROR2 ("missing binary operator before token \"%s\"",
+ cpp_token_as_text (pfile, op.token));
+ want_value = false;
+ top->value = eval_token (pfile, op.token);
+ continue;
+
+ case CPP_NOT:
+ saw_leading_not = lex_count == 1;
+ break;
+ case CPP_PLUS:
+ if (want_value)
+ op.op = CPP_UPLUS;
+ break;
+ case CPP_MINUS:
+ if (want_value)
+ op.op = CPP_UMINUS;
+ break;
+
+ default:
+ if ((int) op.op <= (int) CPP_EQ || (int) op.op >= (int) CPP_PLUS_EQ)
+ SYNTAX_ERROR2 ("token \"%s\" is not valid in preprocessor expressions",
+ cpp_token_as_text (pfile, op.token));
+ break;
+ }
+
+ /* Check we have a value or operator as appropriate. */
+ if (optab[op.op].flags & NO_L_OPERAND)
+ {
+ if (!want_value)
+ SYNTAX_ERROR2 ("missing binary operator before token \"%s\"",
+ cpp_token_as_text (pfile, op.token));
+ }
+ else if (want_value)
+ {
+ /* Ordering here is subtle and intended to favor the
+ missing parenthesis diagnostics over alternatives. */
+ if (op.op == CPP_CLOSE_PAREN)
{
- if (*ip->cur != ')')
- goto oops;
- ++ip->cur;
+ if (top->op == CPP_OPEN_PAREN)
+ SYNTAX_ERROR ("void expression between '(' and ')'");
}
- if (cpp_lookup (pfile, tok, len, -1))
- op.value = 1;
-
+ else if (top->op == CPP_EOF)
+ SYNTAX_ERROR ("#if with no expression");
+ if (top->op != CPP_EOF && top->op != CPP_OPEN_PAREN)
+ SYNTAX_ERROR2 ("operator '%s' has no right operand",
+ cpp_token_as_text (pfile, top->token));
}
- return op;
-
- oops:
- cpp_error (pfile, "`defined' without an identifier");
- return op;
-
- case CPP_OTHER:
- /* See if it is a special token of length 2. */
- if (tok_start + 2 == tok_end)
- {
- for (toktab = tokentab2; toktab->operator != NULL; toktab++)
- if (tok_start[0] == toktab->operator[0]
- && tok_start[1] == toktab->operator[1])
- break;
- if (toktab->token == ERROR)
- cpp_error (pfile, "`%s' not allowed in operand of `#if'",
- tok_start);
- op.op = toktab->token;
- return op;
+
+ top = reduce (pfile, top, op.op);
+ if (!top)
+ goto syntax_error;
+
+ if (op.op == CPP_EOF)
+ break;
+
+ switch (op.op)
+ {
+ case CPP_CLOSE_PAREN:
+ continue;
+ case CPP_OR_OR:
+ if (!num_zerop (top->value))
+ pfile->state.skip_eval++;
+ break;
+ case CPP_AND_AND:
+ case CPP_QUERY:
+ if (num_zerop (top->value))
+ pfile->state.skip_eval++;
+ break;
+ case CPP_COLON:
+ if (top->op != CPP_QUERY)
+ SYNTAX_ERROR (" ':' without preceding '?'");
+ if (!num_zerop (top[-1].value)) /* Was '?' condition true? */
+ pfile->state.skip_eval++;
+ else
+ pfile->state.skip_eval--;
+ default:
+ break;
}
- /* fall through */
- default:
- op.op = *tok_start;
- return op;
- }
-}
+ want_value = true;
-/* Parse a C escape sequence. STRING_PTR points to a variable
- containing a pointer to the string to parse. That pointer
- is updated past the characters we use. The value of the
- escape sequence is returned.
+ /* Check for and handle stack overflow. */
+ if (++top == pfile->op_limit)
+ top = _cpp_expand_op_stack (pfile);
+
+ top->op = op.op;
+ top->token = op.token;
+ }
- A negative value means the sequence \ newline was seen,
- which is supposed to be equivalent to nothing at all.
+ /* The controlling macro expression is only valid if we called lex 3
+ times: <!> <defined expression> and <EOF>. push_conditional ()
+ checks that we are at top-of-file. */
+ if (pfile->mi_ind_cmacro && !(saw_leading_not && lex_count == 3))
+ pfile->mi_ind_cmacro = 0;
- If \ is followed by a null character, we return a negative
- value and leave the string pointer pointing at the null character.
+ if (top != pfile->op_stack)
+ {
+ cpp_error (pfile, DL_ICE, "unbalanced stack in #if");
+ syntax_error:
+ return false; /* Return false on syntax error. */
+ }
- If \ is followed by 000, we return 0 and leave the string pointer
- after the zeros. A value of 0 does not mean end of string. */
+ return !num_zerop (top->value);
+}
-HOST_WIDEST_INT
-cpp_parse_escape (pfile, string_ptr, result_mask)
- cpp_reader *pfile;
- char **string_ptr;
- HOST_WIDEST_INT result_mask;
+/* Reduce the operator / value stack if possible, in preparation for
+ pushing operator OP. Returns NULL on error, otherwise the top of
+ the stack. */
+static struct op *
+reduce (cpp_reader *pfile, struct op *top, enum cpp_ttype op)
{
- register int c = *(*string_ptr)++;
- switch (c)
+ unsigned int prio;
+
+ if (top->op <= CPP_EQ || top->op > CPP_LAST_CPP_OP + 2)
{
- case 'a':
- return TARGET_BELL;
- case 'b':
- return TARGET_BS;
- case 'e':
- case 'E':
- if (CPP_OPTIONS (pfile)->pedantic)
- cpp_pedwarn (pfile, "non-ANSI-standard escape sequence, `\\%c'", c);
- return 033;
- case 'f':
- return TARGET_FF;
- case 'n':
- return TARGET_NEWLINE;
- case 'r':
- return TARGET_CR;
- case 't':
- return TARGET_TAB;
- case 'v':
- return TARGET_VT;
- case '\n':
- return -2;
- case 0:
- (*string_ptr)--;
+ bad_op:
+ cpp_error (pfile, DL_ICE, "impossible operator '%u'", top->op);
return 0;
-
- case '0':
- case '1':
- case '2':
- case '3':
- case '4':
- case '5':
- case '6':
- case '7':
- {
- register HOST_WIDEST_INT i = c - '0';
- register int count = 0;
- while (++count < 3)
- {
- c = *(*string_ptr)++;
- if (c >= '0' && c <= '7')
- i = (i << 3) + c - '0';
- else
- {
- (*string_ptr)--;
- break;
- }
- }
- if (i != (i & result_mask))
- {
- i &= result_mask;
- cpp_pedwarn (pfile, "octal escape sequence out of range");
- }
- return i;
- }
- case 'x':
- {
- register unsigned HOST_WIDEST_INT i = 0, overflow = 0;
- register int digits_found = 0, digit;
- for (;;)
- {
- c = *(*string_ptr)++;
- if (c >= '0' && c <= '9')
- digit = c - '0';
- else if (c >= 'a' && c <= 'f')
- digit = c - 'a' + 10;
- else if (c >= 'A' && c <= 'F')
- digit = c - 'A' + 10;
- else
- {
- (*string_ptr)--;
- break;
- }
- overflow |= i ^ (i << 4 >> 4);
- i = (i << 4) + digit;
- digits_found = 1;
- }
- if (!digits_found)
- cpp_error (pfile, "\\x used with no following hex digits");
- if (overflow | (i != (i & result_mask)))
- {
- i &= result_mask;
- cpp_pedwarn (pfile, "hex escape sequence out of range");
- }
- return i;
- }
- default:
- return c;
}
+
+ if (op == CPP_OPEN_PAREN)
+ return top;
+
+ /* Decrement the priority of left-associative operators to force a
+ reduction with operators of otherwise equal priority. */
+ prio = optab[op].prio - ((optab[op].flags & LEFT_ASSOC) != 0);
+ while (prio < optab[top->op].prio)
+ {
+ if (CPP_OPTION (pfile, warn_num_sign_change)
+ && optab[top->op].flags & CHECK_PROMOTION)
+ check_promotion (pfile, top);
+
+ switch (top->op)
+ {
+ case CPP_UPLUS:
+ case CPP_UMINUS:
+ case CPP_NOT:
+ case CPP_COMPL:
+ top[-1].value = num_unary_op (pfile, top->value, top->op);
+ break;
+
+ case CPP_PLUS:
+ case CPP_MINUS:
+ case CPP_RSHIFT:
+ case CPP_LSHIFT:
+ case CPP_MIN:
+ case CPP_MAX:
+ case CPP_COMMA:
+ top[-1].value = num_binary_op (pfile, top[-1].value,
+ top->value, top->op);
+ break;
+
+ case CPP_GREATER:
+ case CPP_LESS:
+ case CPP_GREATER_EQ:
+ case CPP_LESS_EQ:
+ top[-1].value
+ = num_inequality_op (pfile, top[-1].value, top->value, top->op);
+ break;
+
+ case CPP_EQ_EQ:
+ case CPP_NOT_EQ:
+ top[-1].value
+ = num_equality_op (pfile, top[-1].value, top->value, top->op);
+ break;
+
+ case CPP_AND:
+ case CPP_OR:
+ case CPP_XOR:
+ top[-1].value
+ = num_bitwise_op (pfile, top[-1].value, top->value, top->op);
+ break;
+
+ case CPP_MULT:
+ top[-1].value = num_mul (pfile, top[-1].value, top->value);
+ break;
+
+ case CPP_DIV:
+ case CPP_MOD:
+ top[-1].value = num_div_op (pfile, top[-1].value,
+ top->value, top->op);
+ break;
+
+ case CPP_OR_OR:
+ top--;
+ if (!num_zerop (top->value))
+ pfile->state.skip_eval--;
+ top->value.low = (!num_zerop (top->value)
+ || !num_zerop (top[1].value));
+ top->value.high = 0;
+ top->value.unsignedp = false;
+ top->value.overflow = false;
+ continue;
+
+ case CPP_AND_AND:
+ top--;
+ if (num_zerop (top->value))
+ pfile->state.skip_eval--;
+ top->value.low = (!num_zerop (top->value)
+ && !num_zerop (top[1].value));
+ top->value.high = 0;
+ top->value.unsignedp = false;
+ top->value.overflow = false;
+ continue;
+
+ case CPP_OPEN_PAREN:
+ if (op != CPP_CLOSE_PAREN)
+ {
+ cpp_error (pfile, DL_ERROR, "missing ')' in expression");
+ return 0;
+ }
+ top--;
+ top->value = top[1].value;
+ return top;
+
+ case CPP_COLON:
+ top -= 2;
+ if (!num_zerop (top->value))
+ {
+ pfile->state.skip_eval--;
+ top->value = top[1].value;
+ }
+ else
+ top->value = top[2].value;
+ top->value.unsignedp = (top[1].value.unsignedp
+ || top[2].value.unsignedp);
+ continue;
+
+ case CPP_QUERY:
+ cpp_error (pfile, DL_ERROR, "'?' without following ':'");
+ return 0;
+
+ default:
+ goto bad_op;
+ }
+
+ top--;
+ if (top->value.overflow && !pfile->state.skip_eval)
+ cpp_error (pfile, DL_PEDWARN,
+ "integer overflow in preprocessor expression");
+ }
+
+ if (op == CPP_CLOSE_PAREN)
+ {
+ cpp_error (pfile, DL_ERROR, "missing '(' in expression");
+ return 0;
+ }
+
+ return top;
}
+/* Returns the position of the old top of stack after expansion. */
+struct op *
+_cpp_expand_op_stack (cpp_reader *pfile)
+{
+ size_t old_size = (size_t) (pfile->op_limit - pfile->op_stack);
+ size_t new_size = old_size * 2 + 20;
+
+ pfile->op_stack = xrealloc (pfile->op_stack, new_size * sizeof (struct op));
+ pfile->op_limit = pfile->op_stack + new_size;
+
+ return pfile->op_stack + old_size;
+}
+
+/* Emits a warning if the effective sign of either operand of OP
+ changes because of integer promotions. */
static void
-integer_overflow (pfile)
- cpp_reader *pfile;
+check_promotion (cpp_reader *pfile, const struct op *op)
{
- if (CPP_PEDANTIC (pfile))
- cpp_pedwarn (pfile, "integer overflow in preprocessor expression");
+ if (op->value.unsignedp == op[-1].value.unsignedp)
+ return;
+
+ if (op->value.unsignedp)
+ {
+ if (!num_positive (op[-1].value, CPP_OPTION (pfile, precision)))
+ cpp_error (pfile, DL_WARNING,
+ "the left operand of \"%s\" changes sign when promoted",
+ cpp_token_as_text (pfile, op->token));
+ }
+ else if (!num_positive (op->value, CPP_OPTION (pfile, precision)))
+ cpp_error (pfile, DL_WARNING,
+ "the right operand of \"%s\" changes sign when promoted",
+ cpp_token_as_text (pfile, op->token));
}
-static HOST_WIDEST_INT
-left_shift (pfile, a, unsignedp, b)
- cpp_reader *pfile;
- HOST_WIDEST_INT a;
- int unsignedp;
- unsigned HOST_WIDEST_INT b;
+/* Clears the unused high order bits of the number pointed to by PNUM. */
+static cpp_num
+num_trim (cpp_num num, size_t precision)
{
- if (b >= HOST_BITS_PER_WIDEST_INT)
+ if (precision > PART_PRECISION)
{
- if (! unsignedp && a != 0)
- integer_overflow (pfile);
- return 0;
+ precision -= PART_PRECISION;
+ if (precision < PART_PRECISION)
+ num.high &= ((cpp_num_part) 1 << precision) - 1;
}
- else if (unsignedp)
- return (unsigned HOST_WIDEST_INT) a << b;
else
{
- HOST_WIDEST_INT l = a << b;
- if (l >> b != a)
- integer_overflow (pfile);
- return l;
+ if (precision < PART_PRECISION)
+ num.low &= ((cpp_num_part) 1 << precision) - 1;
+ num.high = 0;
}
+
+ return num;
}
-static HOST_WIDEST_INT
-right_shift (pfile, a, unsignedp, b)
- cpp_reader *pfile ATTRIBUTE_UNUSED;
- HOST_WIDEST_INT a;
- int unsignedp;
- unsigned HOST_WIDEST_INT b;
+/* True iff A (presumed signed) >= 0. */
+static bool
+num_positive (cpp_num num, size_t precision)
{
- if (b >= HOST_BITS_PER_WIDEST_INT)
- return unsignedp ? 0 : a >> (HOST_BITS_PER_WIDEST_INT - 1);
- else if (unsignedp)
- return (unsigned HOST_WIDEST_INT) a >> b;
- else
- return a >> b;
+ if (precision > PART_PRECISION)
+ {
+ precision -= PART_PRECISION;
+ return (num.high & (cpp_num_part) 1 << (precision - 1)) == 0;
+ }
+
+ return (num.low & (cpp_num_part) 1 << (precision - 1)) == 0;
}
-\f
-/* These priorities are all even, so we can handle associatively. */
-#define PAREN_INNER_PRIO 0
-#define COMMA_PRIO 4
-#define COND_PRIO (COMMA_PRIO+2)
-#define OROR_PRIO (COND_PRIO+2)
-#define ANDAND_PRIO (OROR_PRIO+2)
-#define OR_PRIO (ANDAND_PRIO+2)
-#define XOR_PRIO (OR_PRIO+2)
-#define AND_PRIO (XOR_PRIO+2)
-#define EQUAL_PRIO (AND_PRIO+2)
-#define LESS_PRIO (EQUAL_PRIO+2)
-#define SHIFT_PRIO (LESS_PRIO+2)
-#define PLUS_PRIO (SHIFT_PRIO+2)
-#define MUL_PRIO (PLUS_PRIO+2)
-#define UNARY_PRIO (MUL_PRIO+2)
-#define PAREN_OUTER_PRIO (UNARY_PRIO+2)
-
-#define COMPARE(OP) \
- top->unsignedp = 0;\
- top->value = (unsigned1 || unsigned2) \
- ? (unsigned HOST_WIDEST_INT) v1 OP (unsigned HOST_WIDEST_INT) v2 : (v1 OP v2)
-/* Parse and evaluate a C expression, reading from PFILE.
- Returns the value of the expression. */
+/* Sign extend a number, with PRECISION significant bits and all
+ others assumed clear, to fill out a cpp_num structure. */
+cpp_num
+cpp_num_sign_extend (cpp_num num, size_t precision)
+{
+ if (!num.unsignedp)
+ {
+ if (precision > PART_PRECISION)
+ {
+ precision -= PART_PRECISION;
+ if (precision < PART_PRECISION
+ && (num.high & (cpp_num_part) 1 << (precision - 1)))
+ num.high |= ~(~(cpp_num_part) 0 >> (PART_PRECISION - precision));
+ }
+ else if (num.low & (cpp_num_part) 1 << (precision - 1))
+ {
+ if (precision < PART_PRECISION)
+ num.low |= ~(~(cpp_num_part) 0 >> (PART_PRECISION - precision));
+ num.high = ~(cpp_num_part) 0;
+ }
+ }
+
+ return num;
+}
-HOST_WIDEST_INT
-cpp_parse_expr (pfile)
- cpp_reader *pfile;
+/* Returns the negative of NUM. */
+static cpp_num
+num_negate (cpp_num num, size_t precision)
{
- /* The implementation is an operator precedence parser,
- i.e. a bottom-up parser, using a stack for not-yet-reduced tokens.
-
- The stack base is 'stack', and the current stack pointer is 'top'.
- There is a stack element for each operator (only),
- and the most recently pushed operator is 'top->op'.
- An operand (value) is stored in the 'value' field of the stack
- element of the operator that precedes it.
- In that case the 'flags' field has the HAVE_VALUE flag set. */
-
-#define INIT_STACK_SIZE 20
- struct operation init_stack[INIT_STACK_SIZE];
- struct operation *stack = init_stack;
- struct operation *limit = stack + INIT_STACK_SIZE;
- register struct operation *top = stack;
- int lprio, rprio = 0;
- int skip_evaluation = 0;
-
- top->rprio = 0;
- top->flags = 0;
- for (;;)
+ cpp_num copy;
+
+ copy = num;
+ num.high = ~num.high;
+ num.low = ~num.low;
+ if (++num.low == 0)
+ num.high++;
+ num = num_trim (num, precision);
+ num.overflow = (!num.unsignedp && num_eq (num, copy) && !num_zerop (num));
+
+ return num;
+}
+
+/* Returns true if A >= B. */
+static bool
+num_greater_eq (cpp_num pa, cpp_num pb, size_t precision)
+{
+ bool unsignedp;
+
+ unsignedp = pa.unsignedp || pb.unsignedp;
+
+ if (!unsignedp)
{
- struct operation op;
- char flags = 0;
+ /* Both numbers have signed type. If they are of different
+ sign, the answer is the sign of A. */
+ unsignedp = num_positive (pa, precision);
+
+ if (unsignedp != num_positive (pb, precision))
+ return unsignedp;
- /* Read a token */
- op = cpp_lex (pfile, skip_evaluation);
+ /* Otherwise we can do an unsigned comparison. */
+ }
- /* See if the token is an operand, in which case go to set_value.
- If the token is an operator, figure out its left and right
- priorities, and then goto maybe_reduce. */
+ return (pa.high > pb.high) || (pa.high == pb.high && pa.low >= pb.low);
+}
- switch (op.op)
+/* Returns LHS OP RHS, where OP is a bit-wise operation. */
+static cpp_num
+num_bitwise_op (cpp_reader *pfile ATTRIBUTE_UNUSED,
+ cpp_num lhs, cpp_num rhs, enum cpp_ttype op)
+{
+ lhs.overflow = false;
+ lhs.unsignedp = lhs.unsignedp || rhs.unsignedp;
+
+ /* As excess precision is zeroed, there is no need to num_trim () as
+ these operations cannot introduce a set bit there. */
+ if (op == CPP_AND)
+ {
+ lhs.low &= rhs.low;
+ lhs.high &= rhs.high;
+ }
+ else if (op == CPP_OR)
+ {
+ lhs.low |= rhs.low;
+ lhs.high |= rhs.high;
+ }
+ else
+ {
+ lhs.low ^= rhs.low;
+ lhs.high ^= rhs.high;
+ }
+
+ return lhs;
+}
+
+/* Returns LHS OP RHS, where OP is an inequality. */
+static cpp_num
+num_inequality_op (cpp_reader *pfile, cpp_num lhs, cpp_num rhs,
+ enum cpp_ttype op)
+{
+ bool gte = num_greater_eq (lhs, rhs, CPP_OPTION (pfile, precision));
+
+ if (op == CPP_GREATER_EQ)
+ lhs.low = gte;
+ else if (op == CPP_LESS)
+ lhs.low = !gte;
+ else if (op == CPP_GREATER)
+ lhs.low = gte && !num_eq (lhs, rhs);
+ else /* CPP_LESS_EQ. */
+ lhs.low = !gte || num_eq (lhs, rhs);
+
+ lhs.high = 0;
+ lhs.overflow = false;
+ lhs.unsignedp = false;
+ return lhs;
+}
+
+/* Returns LHS OP RHS, where OP is == or !=. */
+static cpp_num
+num_equality_op (cpp_reader *pfile ATTRIBUTE_UNUSED,
+ cpp_num lhs, cpp_num rhs, enum cpp_ttype op)
+{
+ /* Work around a 3.0.4 bug; see PR 6950. */
+ bool eq = num_eq (lhs, rhs);
+ if (op == CPP_NOT_EQ)
+ eq = !eq;
+ lhs.low = eq;
+ lhs.high = 0;
+ lhs.overflow = false;
+ lhs.unsignedp = false;
+ return lhs;
+}
+
+/* Shift NUM, of width PRECISION, right by N bits. */
+static cpp_num
+num_rshift (cpp_num num, size_t precision, size_t n)
+{
+ cpp_num_part sign_mask;
+
+ if (num.unsignedp || num_positive (num, precision))
+ sign_mask = 0;
+ else
+ sign_mask = ~(cpp_num_part) 0;
+
+ if (n >= precision)
+ num.high = num.low = sign_mask;
+ else
+ {
+ /* Sign-extend. */
+ if (precision < PART_PRECISION)
+ num.high = sign_mask, num.low |= sign_mask << precision;
+ else if (precision < 2 * PART_PRECISION)
+ num.high |= sign_mask << (precision - PART_PRECISION);
+
+ if (n >= PART_PRECISION)
{
- case NAME:
- cpp_fatal (pfile, "internal error: cpp_lex returns a NAME");
- goto syntax_error;
- case INT: case CHAR:
- top->value = op.value;
- top->unsignedp = op.unsignedp;
- goto set_value;
- case 0:
- lprio = 0; goto maybe_reduce;
- case '+': case '-':
- /* Is this correct if unary ? FIXME */
- flags = RIGHT_OPERAND_REQUIRED;
- lprio = PLUS_PRIO; rprio = lprio + 1; goto maybe_reduce;
- case '!': case '~':
- flags = RIGHT_OPERAND_REQUIRED;
- rprio = UNARY_PRIO; lprio = rprio + 1; goto maybe_reduce;
- case '*': case '/': case '%':
- lprio = MUL_PRIO; goto binop;
- case '<': case '>': case LEQ: case GEQ:
- lprio = LESS_PRIO; goto binop;
- case EQUAL: case NOTEQUAL:
- lprio = EQUAL_PRIO; goto binop;
- case LSH: case RSH:
- lprio = SHIFT_PRIO; goto binop;
- case '&': lprio = AND_PRIO; goto binop;
- case '^': lprio = XOR_PRIO; goto binop;
- case '|': lprio = OR_PRIO; goto binop;
- case ANDAND: lprio = ANDAND_PRIO; goto binop;
- case OROR: lprio = OROR_PRIO; goto binop;
- case ',':
- lprio = COMMA_PRIO; goto binop;
- case '(':
- lprio = PAREN_OUTER_PRIO; rprio = PAREN_INNER_PRIO;
- goto maybe_reduce;
- case ')':
- lprio = PAREN_INNER_PRIO; rprio = PAREN_OUTER_PRIO;
- goto maybe_reduce;
- case ':':
- lprio = COND_PRIO; rprio = COND_PRIO;
- goto maybe_reduce;
- case '?':
- lprio = COND_PRIO + 1; rprio = COND_PRIO;
- goto maybe_reduce;
- case ERROR:
- goto syntax_error;
- binop:
- flags = LEFT_OPERAND_REQUIRED|RIGHT_OPERAND_REQUIRED;
- rprio = lprio + 1;
- goto maybe_reduce;
- default:
- cpp_error (pfile, "invalid character in #if");
- goto syntax_error;
+ n -= PART_PRECISION;
+ num.low = num.high;
+ num.high = sign_mask;
}
- set_value:
- /* Push a value onto the stack. */
- if (top->flags & HAVE_VALUE)
+ if (n)
{
- cpp_error (pfile, "syntax error in #if");
- goto syntax_error;
+ num.low = (num.low >> n) | (num.high << (PART_PRECISION - n));
+ num.high = (num.high >> n) | (sign_mask << (PART_PRECISION - n));
}
- top->flags |= HAVE_VALUE;
- continue;
+ }
- maybe_reduce:
- /* Push an operator, and check if we can reduce now. */
- while (top->rprio > lprio)
+ num = num_trim (num, precision);
+ num.overflow = false;
+ return num;
+}
+
+/* Shift NUM, of width PRECISION, left by N bits. */
+static cpp_num
+num_lshift (cpp_num num, size_t precision, size_t n)
+{
+ if (n >= precision)
+ {
+ num.overflow = !num.unsignedp && !num_zerop (num);
+ num.high = num.low = 0;
+ }
+ else
+ {
+ cpp_num orig, maybe_orig;
+ size_t m = n;
+
+ orig = num;
+ if (m >= PART_PRECISION)
{
- HOST_WIDEST_INT v1 = top[-1].value, v2 = top[0].value;
- int unsigned1 = top[-1].unsignedp, unsigned2 = top[0].unsignedp;
- top--;
- if ((top[1].flags & LEFT_OPERAND_REQUIRED)
- && ! (top[0].flags & HAVE_VALUE))
- {
- cpp_error (pfile, "syntax error - missing left operand");
- goto syntax_error;
- }
- if ((top[1].flags & RIGHT_OPERAND_REQUIRED)
- && ! (top[1].flags & HAVE_VALUE))
- {
- cpp_error (pfile, "syntax error - missing right operand");
- goto syntax_error;
- }
- /* top[0].value = (top[1].op)(v1, v2);*/
- switch (top[1].op)
- {
- case '+':
- if (!(top->flags & HAVE_VALUE))
- { /* Unary '+' */
- top->value = v2;
- top->unsignedp = unsigned2;
- top->flags |= HAVE_VALUE;
- }
- else
- {
- top->value = v1 + v2;
- top->unsignedp = unsigned1 || unsigned2;
- if (! top->unsignedp && ! skip_evaluation
- && ! possible_sum_sign (v1, v2, top->value))
- integer_overflow (pfile);
- }
- break;
- case '-':
- if (!(top->flags & HAVE_VALUE))
- { /* Unary '-' */
- top->value = - v2;
- if (!skip_evaluation && (top->value & v2) < 0 && !unsigned2)
- integer_overflow (pfile);
- top->unsignedp = unsigned2;
- top->flags |= HAVE_VALUE;
- }
- else
- { /* Binary '-' */
- top->value = v1 - v2;
- top->unsignedp = unsigned1 || unsigned2;
- if (! top->unsignedp && ! skip_evaluation
- && ! possible_sum_sign (top->value, v2, v1))
- integer_overflow (pfile);
- }
- break;
- case '*':
- top->unsignedp = unsigned1 || unsigned2;
- if (top->unsignedp)
- top->value = (unsigned HOST_WIDEST_INT) v1 * v2;
- else if (!skip_evaluation)
- {
- top->value = v1 * v2;
- if (v1
- && (top->value / v1 != v2
- || (top->value & v1 & v2) < 0))
- integer_overflow (pfile);
- }
- break;
- case '/':
- if (skip_evaluation)
- break;
- if (v2 == 0)
- {
- cpp_error (pfile, "division by zero in #if");
- v2 = 1;
- }
- top->unsignedp = unsigned1 || unsigned2;
- if (top->unsignedp)
- top->value = (unsigned HOST_WIDEST_INT) v1 / v2;
- else
- {
- top->value = v1 / v2;
- if ((top->value & v1 & v2) < 0)
- integer_overflow (pfile);
- }
- break;
- case '%':
- if (skip_evaluation)
- break;
- if (v2 == 0)
- {
- cpp_error (pfile, "division by zero in #if");
- v2 = 1;
- }
- top->unsignedp = unsigned1 || unsigned2;
- if (top->unsignedp)
- top->value = (unsigned HOST_WIDEST_INT) v1 % v2;
- else
- top->value = v1 % v2;
- break;
- case '!':
- if (top->flags & HAVE_VALUE)
- {
- cpp_error (pfile, "syntax error");
- goto syntax_error;
- }
- top->value = ! v2;
- top->unsignedp = 0;
- top->flags |= HAVE_VALUE;
- break;
- case '~':
- if (top->flags & HAVE_VALUE)
- {
- cpp_error (pfile, "syntax error");
- goto syntax_error;
- }
- top->value = ~ v2;
- top->unsignedp = unsigned2;
- top->flags |= HAVE_VALUE;
- break;
- case '<': COMPARE(<); break;
- case '>': COMPARE(>); break;
- case LEQ: COMPARE(<=); break;
- case GEQ: COMPARE(>=); break;
- case EQUAL:
- top->value = (v1 == v2);
- top->unsignedp = 0;
- break;
- case NOTEQUAL:
- top->value = (v1 != v2);
- top->unsignedp = 0;
- break;
- case LSH:
- if (skip_evaluation)
- break;
- top->unsignedp = unsigned1;
- if (v2 < 0 && ! unsigned2)
- top->value = right_shift (pfile, v1, unsigned1, -v2);
- else
- top->value = left_shift (pfile, v1, unsigned1, v2);
- break;
- case RSH:
- if (skip_evaluation)
- break;
- top->unsignedp = unsigned1;
- if (v2 < 0 && ! unsigned2)
- top->value = left_shift (pfile, v1, unsigned1, -v2);
- else
- top->value = right_shift (pfile, v1, unsigned1, v2);
- break;
-#define LOGICAL(OP) \
- top->value = v1 OP v2;\
- top->unsignedp = unsigned1 || unsigned2;
- case '&': LOGICAL(&); break;
- case '^': LOGICAL(^); break;
- case '|': LOGICAL(|); break;
- case ANDAND:
- top->value = v1 && v2; top->unsignedp = 0;
- if (!v1) skip_evaluation--;
- break;
- case OROR:
- top->value = v1 || v2; top->unsignedp = 0;
- if (v1) skip_evaluation--;
- break;
- case ',':
- if (CPP_PEDANTIC (pfile))
- cpp_pedwarn (pfile, "comma operator in operand of `#if'");
- top->value = v2;
- top->unsignedp = unsigned2;
- break;
- case '(': case '?':
- cpp_error (pfile, "syntax error in #if");
- goto syntax_error;
- case ':':
- if (top[0].op != '?')
- {
- cpp_error (pfile,
- "syntax error ':' without preceding '?'");
- goto syntax_error;
- }
- else if (! (top[1].flags & HAVE_VALUE)
- || !(top[-1].flags & HAVE_VALUE)
- || !(top[0].flags & HAVE_VALUE))
- {
- cpp_error (pfile, "bad syntax for ?: operator");
- goto syntax_error;
- }
- else
- {
- top--;
- if (top->value) skip_evaluation--;
- top->value = top->value ? v1 : v2;
- top->unsignedp = unsigned1 || unsigned2;
- }
- break;
- case ')':
- if ((top[1].flags & HAVE_VALUE)
- || ! (top[0].flags & HAVE_VALUE)
- || top[0].op != '('
- || (top[-1].flags & HAVE_VALUE))
- {
- cpp_error (pfile, "mismatched parentheses in #if");
- goto syntax_error;
- }
- else
- {
- top--;
- top->value = v1;
- top->unsignedp = unsigned1;
- top->flags |= HAVE_VALUE;
- }
- break;
- default:
- cpp_error (pfile,
- (top[1].op >= ' ' && top[1].op <= '~'
- ? "unimplemented operator '%c'\n"
- : "unimplemented operator '\\%03o'\n"),
- top[1].op);
- }
+ m -= PART_PRECISION;
+ num.high = num.low;
+ num.low = 0;
}
- if (op.op == 0)
+ if (m)
{
- if (top != stack)
- cpp_error (pfile, "internal error in #if expression");
- if (stack != init_stack)
- free (stack);
- return top->value;
+ num.high = (num.high << m) | (num.low >> (PART_PRECISION - m));
+ num.low <<= m;
}
- top++;
-
- /* Check for and handle stack overflow. */
- if (top == limit)
+ num = num_trim (num, precision);
+
+ if (num.unsignedp)
+ num.overflow = false;
+ else
+ {
+ maybe_orig = num_rshift (num, precision, n);
+ num.overflow = !num_eq (orig, maybe_orig);
+ }
+ }
+
+ return num;
+}
+
+/* The four unary operators: +, -, ! and ~. */
+static cpp_num
+num_unary_op (cpp_reader *pfile, cpp_num num, enum cpp_ttype op)
+{
+ switch (op)
+ {
+ case CPP_UPLUS:
+ if (CPP_WTRADITIONAL (pfile) && !pfile->state.skip_eval)
+ cpp_error (pfile, DL_WARNING,
+ "traditional C rejects the unary plus operator");
+ num.overflow = false;
+ break;
+
+ case CPP_UMINUS:
+ num = num_negate (num, CPP_OPTION (pfile, precision));
+ break;
+
+ case CPP_COMPL:
+ num.high = ~num.high;
+ num.low = ~num.low;
+ num = num_trim (num, CPP_OPTION (pfile, precision));
+ num.overflow = false;
+ break;
+
+ default: /* case CPP_NOT: */
+ num.low = num_zerop (num);
+ num.high = 0;
+ num.overflow = false;
+ num.unsignedp = false;
+ break;
+ }
+
+ return num;
+}
+
+/* The various binary operators. */
+static cpp_num
+num_binary_op (cpp_reader *pfile, cpp_num lhs, cpp_num rhs, enum cpp_ttype op)
+{
+ cpp_num result;
+ size_t precision = CPP_OPTION (pfile, precision);
+ bool gte;
+ size_t n;
+
+ switch (op)
+ {
+ /* Shifts. */
+ case CPP_LSHIFT:
+ case CPP_RSHIFT:
+ if (!rhs.unsignedp && !num_positive (rhs, precision))
{
- struct operation *new_stack;
- int old_size = (char *) limit - (char *) stack;
- int new_size = 2 * old_size;
- if (stack != init_stack)
- new_stack = (struct operation *) xrealloc (stack, new_size);
+ /* A negative shift is a positive shift the other way. */
+ if (op == CPP_LSHIFT)
+ op = CPP_RSHIFT;
else
- {
- new_stack = (struct operation *) xmalloc (new_size);
- bcopy ((char *) stack, (char *) new_stack, old_size);
- }
- stack = new_stack;
- top = (struct operation *) ((char *) new_stack + old_size);
- limit = (struct operation *) ((char *) new_stack + new_size);
+ op = CPP_LSHIFT;
+ rhs = num_negate (rhs, precision);
}
-
- top->flags = flags;
- top->rprio = rprio;
- top->op = op.op;
- if ((op.op == OROR && top[-1].value)
- || (op.op == ANDAND && !top[-1].value)
- || (op.op == '?' && !top[-1].value))
+ if (rhs.high)
+ n = ~0; /* Maximal. */
+ else
+ n = rhs.low;
+ if (op == CPP_LSHIFT)
+ lhs = num_lshift (lhs, precision, n);
+ else
+ lhs = num_rshift (lhs, precision, n);
+ break;
+
+ /* Min / Max. */
+ case CPP_MIN:
+ case CPP_MAX:
+ {
+ bool unsignedp = lhs.unsignedp || rhs.unsignedp;
+
+ gte = num_greater_eq (lhs, rhs, precision);
+ if (op == CPP_MIN)
+ gte = !gte;
+ if (!gte)
+ lhs = rhs;
+ lhs.unsignedp = unsignedp;
+ }
+ break;
+
+ /* Arithmetic. */
+ case CPP_MINUS:
+ rhs = num_negate (rhs, precision);
+ case CPP_PLUS:
+ result.low = lhs.low + rhs.low;
+ result.high = lhs.high + rhs.high;
+ if (result.low < lhs.low)
+ result.high++;
+
+ result = num_trim (result, precision);
+ result.unsignedp = lhs.unsignedp || rhs.unsignedp;
+ if (result.unsignedp)
+ result.overflow = false;
+ else
{
- skip_evaluation++;
+ bool lhsp = num_positive (lhs, precision);
+ result.overflow = (lhsp == num_positive (rhs, precision)
+ && lhsp != num_positive (result, precision));
}
- else if (op.op == ':')
+ return result;
+
+ /* Comma. */
+ default: /* case CPP_COMMA: */
+ if (CPP_PEDANTIC (pfile) && !pfile->state.skip_eval)
+ cpp_error (pfile, DL_PEDWARN,
+ "comma operator in operand of #if");
+ lhs = rhs;
+ break;
+ }
+
+ return lhs;
+}
+
+/* Multiplies two unsigned cpp_num_parts to give a cpp_num. This
+ cannot overflow. */
+static cpp_num
+num_part_mul (cpp_num_part lhs, cpp_num_part rhs)
+{
+ cpp_num result;
+ cpp_num_part middle[2], temp;
+
+ result.low = LOW_PART (lhs) * LOW_PART (rhs);
+ result.high = HIGH_PART (lhs) * HIGH_PART (rhs);
+
+ middle[0] = LOW_PART (lhs) * HIGH_PART (rhs);
+ middle[1] = HIGH_PART (lhs) * LOW_PART (rhs);
+
+ temp = result.low;
+ result.low += LOW_PART (middle[0]) << (PART_PRECISION / 2);
+ if (result.low < temp)
+ result.high++;
+
+ temp = result.low;
+ result.low += LOW_PART (middle[1]) << (PART_PRECISION / 2);
+ if (result.low < temp)
+ result.high++;
+
+ result.high += HIGH_PART (middle[0]);
+ result.high += HIGH_PART (middle[1]);
+ result.unsignedp = 1;
+
+ return result;
+}
+
+/* Multiply two preprocessing numbers. */
+static cpp_num
+num_mul (cpp_reader *pfile, cpp_num lhs, cpp_num rhs)
+{
+ cpp_num result, temp;
+ bool unsignedp = lhs.unsignedp || rhs.unsignedp;
+ bool overflow, negate = false;
+ size_t precision = CPP_OPTION (pfile, precision);
+
+ /* Prepare for unsigned multiplication. */
+ if (!unsignedp)
+ {
+ if (!num_positive (lhs, precision))
+ negate = !negate, lhs = num_negate (lhs, precision);
+ if (!num_positive (rhs, precision))
+ negate = !negate, rhs = num_negate (rhs, precision);
+ }
+
+ overflow = lhs.high && rhs.high;
+ result = num_part_mul (lhs.low, rhs.low);
+
+ temp = num_part_mul (lhs.high, rhs.low);
+ result.high += temp.low;
+ if (temp.high)
+ overflow = true;
+
+ temp = num_part_mul (lhs.low, rhs.high);
+ result.high += temp.low;
+ if (temp.high)
+ overflow = true;
+
+ temp.low = result.low, temp.high = result.high;
+ result = num_trim (result, precision);
+ if (!num_eq (result, temp))
+ overflow = true;
+
+ if (negate)
+ result = num_negate (result, precision);
+
+ if (unsignedp)
+ result.overflow = false;
+ else
+ result.overflow = overflow || (num_positive (result, precision) ^ !negate
+ && !num_zerop (result));
+ result.unsignedp = unsignedp;
+
+ return result;
+}
+
+/* Divide two preprocessing numbers, returning the answer or the
+ remainder depending upon OP. */
+static cpp_num
+num_div_op (cpp_reader *pfile, cpp_num lhs, cpp_num rhs, enum cpp_ttype op)
+{
+ cpp_num result, sub;
+ cpp_num_part mask;
+ bool unsignedp = lhs.unsignedp || rhs.unsignedp;
+ bool negate = false, lhs_neg = false;
+ size_t i, precision = CPP_OPTION (pfile, precision);
+
+ /* Prepare for unsigned division. */
+ if (!unsignedp)
+ {
+ if (!num_positive (lhs, precision))
+ negate = !negate, lhs_neg = true, lhs = num_negate (lhs, precision);
+ if (!num_positive (rhs, precision))
+ negate = !negate, rhs = num_negate (rhs, precision);
+ }
+
+ /* Find the high bit. */
+ if (rhs.high)
+ {
+ i = precision - 1;
+ mask = (cpp_num_part) 1 << (i - PART_PRECISION);
+ for (; ; i--, mask >>= 1)
+ if (rhs.high & mask)
+ break;
+ }
+ else if (rhs.low)
+ {
+ if (precision > PART_PRECISION)
+ i = precision - PART_PRECISION - 1;
+ else
+ i = precision - 1;
+ mask = (cpp_num_part) 1 << i;
+ for (; ; i--, mask >>= 1)
+ if (rhs.low & mask)
+ break;
+ }
+ else
+ {
+ if (!pfile->state.skip_eval)
+ cpp_error (pfile, DL_ERROR, "division by zero in #if");
+ return lhs;
+ }
+
+ /* First nonzero bit of RHS is bit I. Do naive division by
+ shifting the RHS fully left, and subtracting from LHS if LHS is
+ at least as big, and then repeating but with one less shift.
+ This is not very efficient, but is easy to understand. */
+
+ rhs.unsignedp = true;
+ lhs.unsignedp = true;
+ i = precision - i - 1;
+ sub = num_lshift (rhs, precision, i);
+
+ result.high = result.low = 0;
+ for (;;)
+ {
+ if (num_greater_eq (lhs, sub, precision))
{
- if (top[-2].value) /* Was condition true? */
- skip_evaluation++;
+ lhs = num_binary_op (pfile, lhs, sub, CPP_MINUS);
+ if (i >= PART_PRECISION)
+ result.high |= (cpp_num_part) 1 << (i - PART_PRECISION);
else
- skip_evaluation--;
+ result.low |= (cpp_num_part) 1 << i;
}
+ if (i-- == 0)
+ break;
+ sub.low = (sub.low >> 1) | (sub.high << (PART_PRECISION - 1));
+ sub.high >>= 1;
}
- syntax_error:
- if (stack != init_stack)
- free (stack);
- skip_rest_of_line (pfile);
- return 0;
+
+ /* We divide so that the remainder has the sign of the LHS. */
+ if (op == CPP_DIV)
+ {
+ result.unsignedp = unsignedp;
+ if (unsignedp)
+ result.overflow = false;
+ else
+ {
+ if (negate)
+ result = num_negate (result, precision);
+ result.overflow = num_positive (result, precision) ^ !negate;
+ }
+
+ return result;
+ }
+
+ /* CPP_MOD. */
+ lhs.unsignedp = unsignedp;
+ lhs.overflow = false;
+ if (lhs_neg)
+ lhs = num_negate (lhs, precision);
+
+ return lhs;
}
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