#include <locale.h>
#endif
-/* This is used for communicating lists of keywords with cccp.c. */
-struct arglist {
- struct arglist *next;
- U_CHAR *name;
- int length;
- int argno;
-};
-
#ifndef CHAR_TYPE_SIZE
#define CHAR_TYPE_SIZE BITS_PER_UNIT
#endif
char unsignedp; /* true if value should be treated as unsigned */
HOST_WIDE_INT value; /* The value logically "right" of op. */
};
-\f
-/* Take care of parsing a number (anything that starts with a digit).
- LEN is the number of characters in it. */
-/* maybe needs to actually deal with floating point numbers */
+/* Parse and convert an integer for #if. Accepts decimal, hex, or octal
+ with or without size suffixes. */
-struct operation
-parse_number (pfile, start, olen)
+static struct operation
+parse_number (pfile, start, end)
cpp_reader *pfile;
- char *start;
- int olen;
+ U_CHAR *start;
+ U_CHAR *end;
{
struct operation op;
- register char *p = start;
- register int c;
- register unsigned long n = 0, nd, ULONG_MAX_over_base;
- register int base = 10;
- register int len = olen;
- register int overflow = 0;
- register int digit, largest_digit = 0;
+ U_CHAR *p = start;
+ int c;
+ unsigned HOST_WIDE_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;
- for (c = 0; c < len; c++)
- if (p[c] == '.') {
- /* It's a float since it contains a point. */
- cpp_error (pfile,
- "floating point numbers not allowed in #if expressions");
- op.op = ERROR;
- return op;
+ if (p[0] == '0')
+ {
+ if (end - start >= 3 && (p[1] == 'x' || p[1] == 'X'))
+ {
+ p += 2;
+ base = 16;
+ }
+ else
+ {
+ p += 1;
+ base = 8;
+ }
}
- if (len >= 3 && (!strncmp (p, "0x", 2) || !strncmp (p, "0X", 2))) {
- p += 2;
- base = 16;
- len -= 2;
- }
- else if (*p == '0')
- base = 8;
-
/* Some buggy compilers (e.g. MPW C) seem to need both casts. */
- ULONG_MAX_over_base = ((unsigned long) -1) / ((unsigned long) base);
-
- for (; len > 0; len--) {
- c = *p++;
-
- if (c >= '0' && c <= '9')
- digit = c - '0';
- else if (base == 16 && c >= 'a' && c <= 'f')
- digit = c - 'a' + 10;
- else if (base == 16 && c >= 'A' && c <= 'F')
- digit = c - 'A' + 10;
- else {
- /* `l' means long, and `u' means unsigned. */
- while (1) {
- if (c == 'l' || c == 'L')
- {
- if (spec_long)
- cpp_error (pfile, "two `l's in integer constant");
- spec_long = 1;
- }
- else if (c == 'u' || c == 'U')
- {
- if (op.unsignedp)
- cpp_error (pfile, "two `u's in integer constant");
- op.unsignedp = 1;
- }
- else
- break;
+ MAX_over_base = (((unsigned HOST_WIDE_INT) -1)
+ / ((unsigned HOST_WIDE_INT) base));
- if (--len == 0)
+ while (p < end)
+ {
+ 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;
+ 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;
+ }
+ 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. */
break;
- c = *p++;
- }
- /* Don't look for any more digits after the suffixes. */
- break;
+ }
+
+ if (largest_digit < digit)
+ largest_digit = digit;
+ nd = n * base + digit;
+ overflow |= MAX_over_base < n || nd < n;
+ n = nd;
}
- if (largest_digit < digit)
- largest_digit = digit;
- nd = n * base + digit;
- overflow |= ULONG_MAX_over_base < n || nd < n;
- n = nd;
- }
- if (len != 0)
+ if (p != end)
{
- cpp_error (pfile, "Invalid number in #if expression");
- op.op = ERROR;
- return op;
+ cpp_error (pfile, "invalid number in #if expression");
+ goto error;
}
-
+ else if (spec_long > (CPP_OPTIONS (pfile)->c89 ? 1 : 2))
+ {
+ cpp_error (pfile, "too many `l' suffixes in integer constant");
+ goto error;
+ }
+ else if (op.unsignedp > 1)
+ {
+ 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");
cpp_pedwarn (pfile, "integer constant out of range");
/* If too big to be signed, consider it unsigned. */
- if ((long) n < 0 && ! op.unsignedp)
+ else if ((HOST_WIDE_INT) n < 0 && ! op.unsignedp)
{
if (base == 10)
- cpp_warning (pfile, "integer constant is so large that it is unsigned");
+ cpp_warning (pfile,
+ "integer constant is so large that it is unsigned");
op.unsignedp = 1;
}
op.value = n;
op.op = INT;
return op;
+
+ error:
+ op.op = ERROR;
+ return op;
}
+/* 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;
+{
+ struct operation op;
+ HOST_WIDE_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;
+ (void) mbtowc (NULL_PTR, NULL_PTR, 0);
+#else
+ int c;
+#endif
+
+ if (*ptr == 'L')
+ {
+ ++ptr;
+ width = MAX_WCHAR_TYPE_SIZE, mask = MAX_WCHAR_TYPE_MASK;
+ }
+ max_chars = MAX_LONG_TYPE_SIZE / width;
+
+ ++ptr; /* skip initial quote */
+
+ while (ptr < end)
+ {
+#ifndef MULTIBYTE_CHARS
+ c = *ptr++;
+#else
+ ptr += mbtowc (&c, ptr, end - ptr);
+#endif
+ if (c == '\'' || c == '\0')
+ break;
+ else if (c == '\\')
+ {
+ /* 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");
+ }
+
+ /* Merge character into result; ignore excess chars. */
+ if (++num_chars <= max_chars)
+ {
+ if (width < HOST_BITS_PER_INT)
+ result = (result << width) | (c & ((1 << width) - 1));
+ else
+ result = c;
+ }
+ }
+
+ if (num_chars == 0)
+ {
+ cpp_error (pfile, "empty character constant");
+ goto error;
+ }
+ else if (c != '\'')
+ {
+ /* cpp_get_token has already emitted an error if !traditional. */
+ if (! CPP_TRADITIONAL (pfile))
+ cpp_error (pfile, "malformatted character constant");
+ goto error;
+ }
+ else if (num_chars > max_chars)
+ {
+ cpp_error (pfile, "character constant too long");
+ goto error;
+ }
+ 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 long) ~0
+ >> (HOST_BITS_PER_LONG - num_bits));
+ else
+ op.value = result | ~((unsigned long) ~0
+ >> (HOST_BITS_PER_LONG - num_bits));
+
+ /* This is always a signed type. */
+ op.unsignedp = 0;
+ op.op = CHAR;
+ return op;
+
+ error:
+ op.op = ERROR;
+ return op;
+}
+
+
struct token {
char *operator;
int token;
{NULL, ERROR}
};
-/* This is used to accumulate the value of a character literal. It is static
- so that it only gets allocated once per compilation. */
-static char *token_buffer = NULL;
-
/* Read one token. */
struct operation
cpp_reader *pfile;
int skip_evaluation;
{
- register HOST_WIDE_INT c;
- register struct token *toktab;
+ U_CHAR c;
+ struct token *toktab;
enum cpp_token token;
struct operation op;
U_CHAR *tok_start, *tok_end;
}
cpp_pop_buffer (pfile);
goto retry;
- case CPP_HSPACE: case CPP_COMMENT:
+ case CPP_HSPACE:
+ case CPP_COMMENT:
goto retry;
case CPP_NUMBER:
- return parse_number (pfile, tok_start, tok_end - tok_start);
+ 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;
case CPP_CHAR:
- /* This code for reading a character constant
- handles multicharacter constants and wide characters.
- It is mostly copied from c-lex.c. */
- {
- register int result = 0;
- register int num_chars = 0;
- unsigned width = MAX_CHAR_TYPE_SIZE;
- int wide_flag = 0;
- int max_chars;
- U_CHAR *ptr = tok_start;
-
- /* We need to allocate this buffer dynamically since the size is not
- a constant expression on all platforms. */
- if (token_buffer == NULL)
- {
-#ifdef MULTIBYTE_CHARS
- token_buffer = xmalloc (MAX_LONG_TYPE_SIZE/MAX_CHAR_TYPE_SIZE
- + MB_CUR_MAX);
-#else
- token_buffer = xmalloc (MAX_LONG_TYPE_SIZE/MAX_CHAR_TYPE_SIZE + 1);
-#endif
- }
-
- if (*ptr == 'L')
- {
- ptr++;
- wide_flag = 1;
- width = MAX_WCHAR_TYPE_SIZE;
-#ifdef MULTIBYTE_CHARS
- max_chars = MB_CUR_MAX;
-#else
- max_chars = 1;
-#endif
- }
- else
- max_chars = MAX_LONG_TYPE_SIZE / width;
-
- ++ptr;
- while (ptr < tok_end && ((c = *ptr++) != '\''))
- {
- if (c == '\\')
- {
- c = cpp_parse_escape (pfile, (char **) &ptr,
- wide_flag ? MAX_WCHAR_TYPE_MASK
- : MAX_CHAR_TYPE_MASK);
- if (width < HOST_BITS_PER_INT
- && (unsigned) c >= (unsigned)(1 << width))
- cpp_pedwarn (pfile,
- "escape sequence out of range for character");
- }
-
- num_chars++;
-
- /* Merge character into result; ignore excess chars. */
- if (num_chars < max_chars + 1)
- {
- if (width < HOST_BITS_PER_INT)
- result = (result << width) | (c & ((1 << width) - 1));
- else
- result = c;
- token_buffer[num_chars - 1] = c;
- }
- }
-
- token_buffer[num_chars] = 0;
-
- if (c != '\'')
- cpp_error (pfile, "malformatted character constant");
- else if (num_chars == 0)
- cpp_error (pfile, "empty character constant");
- else if (num_chars > max_chars)
- {
- num_chars = max_chars;
- cpp_error (pfile, "character constant too long");
- }
- else if (num_chars != 1 && ! CPP_TRADITIONAL (pfile))
- cpp_warning (pfile, "multi-character character constant");
-
- /* If char type is signed, sign-extend the constant. */
- if (! wide_flag)
- {
- int 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 long) ~0 >> (HOST_BITS_PER_LONG - num_bits));
- else
- op.value
- = result | ~((unsigned long) ~0 >> (HOST_BITS_PER_LONG - num_bits));
- }
- else
- {
-#ifdef MULTIBYTE_CHARS
- /* Set the initial shift state and convert the next sequence. */
- result = 0;
- /* In all locales L'\0' is zero and mbtowc will return zero,
- so don't use it. */
- if (num_chars > 1
- || (num_chars == 1 && token_buffer[0] != '\0'))
- {
- wchar_t wc;
- (void) mbtowc (NULL_PTR, NULL_PTR, 0);
- if (mbtowc (& wc, token_buffer, num_chars) == num_chars)
- result = wc;
- else
- cpp_pedwarn (pfile,"Ignoring invalid multibyte character");
- }
-#endif
- op.value = result;
- }
- }
-
- /* This is always a signed type. */
- op.unsignedp = 0;
- op.op = CHAR;
-
- return op;
+ return parse_charconst (pfile, tok_start, tok_end);
case CPP_NAME:
if (CPP_WARN_UNDEF (pfile) && !skip_evaluation)
cpp_warning (pfile, "`%.*s' is not defined",
(int) (tok_end - tok_start), tok_start);
- return parse_number (pfile, "0", 0);
+ op.op = INT;
+ op.unsignedp = 0;
+ op.value = 0;
+ return op;
case CPP_OTHER:
/* See if it is a special token of length 2. */
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;
projects / gcc.git / commitdiff