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expr.c
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/* Parse C expressions for cpplib.
Copyright (C) 1987-2018 Free Software Foundation, Inc.
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
Free Software Foundation; either version 3, or (at your option) any
later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "cpplib.h"
#include "internal.h"
#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. */
source_location loc; /* The location of this value. */
enum cpp_ttype op;
};
/* 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,
source_location);
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 *, source_location);
static struct op *reduce (cpp_reader *, struct op *, enum cpp_ttype);
static unsigned int interpret_float_suffix (cpp_reader *, const uchar *, size_t);
static unsigned int interpret_int_suffix (cpp_reader *, const uchar *, size_t);
static void check_promotion (cpp_reader *, const struct op *);
static cpp_num parse_has_include (cpp_reader *, enum include_type);
/* Token type abuse to create unary plus and minus operators. */
#define CPP_UPLUS ((enum cpp_ttype) (CPP_LAST_CPP_OP + 1))
#define CPP_UMINUS ((enum cpp_ttype) (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, CPP_DL_ERROR, msgid); goto syntax_error; } while(0)
#define SYNTAX_ERROR2(msgid, arg) \
do { cpp_error (pfile, CPP_DL_ERROR, msgid, arg); goto syntax_error; } \
while(0)
#define SYNTAX_ERROR_AT(loc, msgid) \
do { cpp_error_with_line (pfile, CPP_DL_ERROR, (loc), 0, msgid); goto syntax_error; } \
while(0)
#define SYNTAX_ERROR2_AT(loc, msgid, arg) \
do { cpp_error_with_line (pfile, CPP_DL_ERROR, (loc), 0, 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 (of CPP_N_* bits) describing the suffix. */
static unsigned int
interpret_float_suffix (cpp_reader *pfile, const uchar *s, size_t len)
{
size_t orig_len = len;
const uchar *orig_s = s;
size_t flags;
size_t f, d, l, w, q, i, fn, fnx, fn_bits;
flags = 0;
f = d = l = w = q = i = fn = fnx = fn_bits = 0;
/* The following decimal float suffixes, from TR 24732:2009 and TS
18661-2:2015, are supported:
df, DF - _Decimal32.
dd, DD - _Decimal64.
dl, DL - _Decimal128.
The dN and DN suffixes for _DecimalN, and dNx and DNx for
_DecimalNx, defined in TS 18661-3:2015, are not supported.
Fixed-point suffixes, from TR 18037:2008, are supported. They
consist of three parts, in order:
(i) An optional u or U, for unsigned types.
(ii) An optional h or H, for short types, or l or L, for long
types, or ll or LL, for long long types. Use of ll or LL is a
GNU extension.
(iii) r or R, for _Fract types, or k or K, for _Accum types.
Otherwise the suffix is for a binary or standard floating-point
type. Such a suffix, or the absence of a suffix, may be preceded
or followed by i, I, j or J, to indicate an imaginary number with
the corresponding complex type. The following suffixes for
binary or standard floating-point types are supported:
f, F - float (ISO C and C++).
l, L - long double (ISO C and C++).
d, D - double, even with the FLOAT_CONST_DECIMAL64 pragma in
operation (from TR 24732:2009; the pragma and the suffix
are not included in TS 18661-2:2015).
w, W - machine-specific type such as __float80 (GNU extension).
q, Q - machine-specific type such as __float128 (GNU extension).
fN, FN - _FloatN (TS 18661-3:2015).
fNx, FNx - _FloatNx (TS 18661-3:2015). */
/* Process decimal float suffixes, which are two letters starting
with d or D. Order and case are significant. */
if (len == 2 && (*s == 'd' || *s == 'D'))
{
bool uppercase = (*s == 'D');
switch (s[1])
{
case 'f': return (!uppercase ? (CPP_N_DFLOAT | CPP_N_SMALL): 0); break;
case 'F': return (uppercase ? (CPP_N_DFLOAT | CPP_N_SMALL) : 0); break;
case 'd': return (!uppercase ? (CPP_N_DFLOAT | CPP_N_MEDIUM): 0); break;
case 'D': return (uppercase ? (CPP_N_DFLOAT | CPP_N_MEDIUM) : 0); break;
case 'l': return (!uppercase ? (CPP_N_DFLOAT | CPP_N_LARGE) : 0); break;
case 'L': return (uppercase ? (CPP_N_DFLOAT | CPP_N_LARGE) : 0); break;
default:
/* Additional two-character suffixes beginning with D are not
for decimal float constants. */
break;
}
}
if (CPP_OPTION (pfile, ext_numeric_literals))
{
/* Recognize a fixed-point suffix. */
if (len != 0)
switch (s[len-1])
{
case 'k': case 'K': flags = CPP_N_ACCUM; break;
case 'r': case 'R': flags = CPP_N_FRACT; break;
default: break;
}
/* Continue processing a fixed-point suffix. The suffix is case
insensitive except for ll or LL. Order is significant. */
if (flags)
{
if (len == 1)
return flags;
len--;
if (*s == 'u' || *s == 'U')
{
flags |= CPP_N_UNSIGNED;
if (len == 1)
return flags;
len--;
s++;
}
switch (*s)
{
case 'h': case 'H':
if (len == 1)
return flags |= CPP_N_SMALL;
break;
case 'l':
if (len == 1)
return flags |= CPP_N_MEDIUM;
if (len == 2 && s[1] == 'l')
return flags |= CPP_N_LARGE;
break;
case 'L':
if (len == 1)
return flags |= CPP_N_MEDIUM;
if (len == 2 && s[1] == 'L')
return flags |= CPP_N_LARGE;
break;
default:
break;
}
/* Anything left at this point is invalid. */
return 0;
}
}
/* In any remaining valid suffix, the case and order don't matter. */
while (len--)
{
switch (s[0])
{
case 'f': case 'F':
f++;
if (len > 0
&& !CPP_OPTION (pfile, cplusplus)
&& s[1] >= '1'
&& s[1] <= '9'
&& fn_bits == 0)
{
f--;
while (len > 0
&& s[1] >= '0'
&& s[1] <= '9'
&& fn_bits < CPP_FLOATN_MAX)
{
fn_bits = fn_bits * 10 + (s[1] - '0');
len--;
s++;
}
if (len > 0 && s[1] == 'x')
{
fnx++;
len--;
s++;
}
else
fn++;
}
break;
case 'd': case 'D': d++; break;
case 'l': case 'L': l++; break;
case 'w': case 'W': w++; break;
case 'q': case 'Q': q++; break;
case 'i': case 'I':
case 'j': case 'J': i++; break;
default:
return 0;
}
s++;
}
/* Reject any case of multiple suffixes specifying types, multiple
suffixes specifying an imaginary constant, _FloatN or _FloatNx
suffixes for invalid values of N, and _FloatN suffixes for values
of N larger than can be represented in the return value. The
caller is responsible for rejecting _FloatN suffixes where
_FloatN is not supported on the chosen target. */
if (f + d + l + w + q + fn + fnx > 1 || i > 1)
return 0;
if (fn_bits > CPP_FLOATN_MAX)
return 0;
if (fnx && fn_bits != 32 && fn_bits != 64 && fn_bits != 128)
return 0;
if (fn && fn_bits != 16 && fn_bits % 32 != 0)
return 0;
if (fn && fn_bits == 96)
return 0;
if (i)
{
if (!CPP_OPTION (pfile, ext_numeric_literals))
return 0;
/* In C++14 and up these suffixes are in the standard library, so treat
them as user-defined literals. */
if (CPP_OPTION (pfile, cplusplus)
&& CPP_OPTION (pfile, lang) > CLK_CXX11
&& orig_s[0] == 'i'
&& (orig_len == 1
|| (orig_len == 2
&& (orig_s[1] == 'f' || orig_s[1] == 'l'))))
return 0;
}
if ((w || q) && !CPP_OPTION (pfile, ext_numeric_literals))
return 0;
return ((i ? CPP_N_IMAGINARY : 0)
| (f ? CPP_N_SMALL :
d ? CPP_N_MEDIUM :
l ? CPP_N_LARGE :
w ? CPP_N_MD_W :
q ? CPP_N_MD_Q :
fn ? CPP_N_FLOATN | (fn_bits << CPP_FLOATN_SHIFT) :
fnx ? CPP_N_FLOATNX | (fn_bits << CPP_FLOATN_SHIFT) :
CPP_N_DEFAULT));
}
/* Return the classification flags for a float suffix. */
unsigned int
cpp_interpret_float_suffix (cpp_reader *pfile, const char *s, size_t len)
{
return interpret_float_suffix (pfile, (const unsigned char *)s, len);
}
/* 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 (cpp_reader *pfile, const uchar *s, size_t len)
{
size_t orig_len = len;
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;
if (i)
{
if (!CPP_OPTION (pfile, ext_numeric_literals))
return 0;
/* In C++14 and up these suffixes are in the standard library, so treat
them as user-defined literals. */
if (CPP_OPTION (pfile, cplusplus)
&& CPP_OPTION (pfile, lang) > CLK_CXX11
&& s[0] == 'i'
&& (orig_len == 1 || (orig_len == 2 && s[1] == 'l')))
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));
}
/* Return the classification flags for an int suffix. */
unsigned int
cpp_interpret_int_suffix (cpp_reader *pfile, const char *s, size_t len)
{
return interpret_int_suffix (pfile, (const unsigned char *)s, len);
}
/* Return the string type corresponding to the the input user-defined string
literal type. If the input type is not a user-defined string literal
type return the input type. */
enum cpp_ttype
cpp_userdef_string_remove_type (enum cpp_ttype type)
{
if (type == CPP_STRING_USERDEF)
return CPP_STRING;
else if (type == CPP_WSTRING_USERDEF)
return CPP_WSTRING;
else if (type == CPP_STRING16_USERDEF)
return CPP_STRING16;
else if (type == CPP_STRING32_USERDEF)
return CPP_STRING32;
else if (type == CPP_UTF8STRING_USERDEF)
return CPP_UTF8STRING;
else
return type;
}
/* Return the user-defined string literal type corresponding to the input
string type. If the input type is not a string type return the input
type. */
enum cpp_ttype
cpp_userdef_string_add_type (enum cpp_ttype type)
{
if (type == CPP_STRING)
return CPP_STRING_USERDEF;
else if (type == CPP_WSTRING)
return CPP_WSTRING_USERDEF;
else if (type == CPP_STRING16)
return CPP_STRING16_USERDEF;
else if (type == CPP_STRING32)
return CPP_STRING32_USERDEF;
else if (type == CPP_UTF8STRING)
return CPP_UTF8STRING_USERDEF;
else
return type;
}
/* Return the char type corresponding to the the input user-defined char
literal type. If the input type is not a user-defined char literal
type return the input type. */
enum cpp_ttype
cpp_userdef_char_remove_type (enum cpp_ttype type)
{
if (type == CPP_CHAR_USERDEF)
return CPP_CHAR;
else if (type == CPP_WCHAR_USERDEF)
return CPP_WCHAR;
else if (type == CPP_CHAR16_USERDEF)
return CPP_CHAR16;
else if (type == CPP_CHAR32_USERDEF)
return CPP_CHAR32;
else if (type == CPP_UTF8CHAR_USERDEF)
return CPP_UTF8CHAR;
else
return type;
}
/* Return the user-defined char literal type corresponding to the input
char type. If the input type is not a char type return the input
type. */
enum cpp_ttype
cpp_userdef_char_add_type (enum cpp_ttype type)
{
if (type == CPP_CHAR)
return CPP_CHAR_USERDEF;
else if (type == CPP_WCHAR)
return CPP_WCHAR_USERDEF;
else if (type == CPP_CHAR16)
return CPP_CHAR16_USERDEF;
else if (type == CPP_CHAR32)
return CPP_CHAR32_USERDEF;
else if (type == CPP_UTF8CHAR)
return CPP_UTF8CHAR_USERDEF;
else
return type;
}
/* Return true if the token type is a user-defined string literal. */
bool
cpp_userdef_string_p (enum cpp_ttype type)
{
if (type == CPP_STRING_USERDEF
|| type == CPP_WSTRING_USERDEF
|| type == CPP_STRING16_USERDEF
|| type == CPP_STRING32_USERDEF
|| type == CPP_UTF8STRING_USERDEF)
return true;
else
return false;
}
/* Return true if the token type is a user-defined char literal. */
bool
cpp_userdef_char_p (enum cpp_ttype type)
{
if (type == CPP_CHAR_USERDEF
|| type == CPP_WCHAR_USERDEF
|| type == CPP_CHAR16_USERDEF
|| type == CPP_CHAR32_USERDEF
|| type == CPP_UTF8CHAR_USERDEF)
return true;
else
return false;
}
/* Extract the suffix from a user-defined literal string or char. */
const char *
cpp_get_userdef_suffix (const cpp_token *tok)
{
unsigned int len = tok->val.str.len;
const char *text = (const char *)tok->val.str.text;
char delim;
unsigned int i;
for (i = 0; i < len; ++i)
if (text[i] == '\'' || text[i] == '"')
break;
if (i == len)
return text + len;
delim = text[i];
for (i = len; i > 0; --i)
if (text[i - 1] == delim)
break;
return text + i;
}
/* Categorize numeric constants according to their field (integer,
floating point, or invalid), radix (decimal, octal, hexadecimal),
and type suffixes.
TOKEN is the token that represents the numeric constant to
classify.
In C++0X if UD_SUFFIX is non null it will be assigned
any unrecognized suffix for a user-defined literal.
VIRTUAL_LOCATION is the virtual location for TOKEN. */
unsigned int
cpp_classify_number (cpp_reader *pfile, const cpp_token *token,
const char **ud_suffix, source_location virtual_location)
{
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;
bool seen_digit;
bool seen_digit_sep;
if (ud_suffix)
*ud_suffix = NULL;
/* 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;
seen_digit = false;
seen_digit_sep = false;
/* First, interpret the radix. */
if (*str == '0')
{
radix = 8;
str++;
/* Require at least one hex digit to classify it as hex. */
if (*str == 'x' || *str == 'X')
{
if (str[1] == '.' || ISXDIGIT (str[1]))
{
radix = 16;
str++;
}
else if (DIGIT_SEP (str[1]))
SYNTAX_ERROR_AT (virtual_location,
"digit separator after base indicator");
}
else if (*str == 'b' || *str == 'B')
{
if (str[1] == '0' || str[1] == '1')
{
radix = 2;
str++;
}
else if (DIGIT_SEP (str[1]))
SYNTAX_ERROR_AT (virtual_location,
"digit separator after base indicator");
}
}
/* Now scan for a well-formed integer or float. */
for (;;)
{
unsigned int c = *str++;
if (ISDIGIT (c) || (ISXDIGIT (c) && radix == 16))
{
seen_digit_sep = false;
seen_digit = true;
c = hex_value (c);
if (c > max_digit)
max_digit = c;
}
else if (DIGIT_SEP (c))
{
if (seen_digit_sep)
SYNTAX_ERROR_AT (virtual_location, "adjacent digit separators");
seen_digit_sep = true;
}
else if (c == '.')
{
if (seen_digit_sep || DIGIT_SEP (*str))
SYNTAX_ERROR_AT (virtual_location,
"digit separator adjacent to decimal point");
seen_digit_sep = false;
if (float_flag == NOT_FLOAT)
float_flag = AFTER_POINT;
else
SYNTAX_ERROR_AT (virtual_location,
"too many decimal points in number");
}
else if ((radix <= 10 && (c == 'e' || c == 'E'))
|| (radix == 16 && (c == 'p' || c == 'P')))
{
if (seen_digit_sep || DIGIT_SEP (*str))
SYNTAX_ERROR_AT (virtual_location,
"digit separator adjacent to exponent");
float_flag = AFTER_EXPON;
break;
}
else
{
/* Start of suffix. */
str--;
break;
}
}
if (seen_digit_sep && float_flag != AFTER_EXPON)
SYNTAX_ERROR_AT (virtual_location,
"digit separator outside digit sequence");
/* The suffix may be for decimal fixed-point constants without exponent. */
if (radix != 16 && float_flag == NOT_FLOAT)
{
result = interpret_float_suffix (pfile, str, limit - str);
if ((result & CPP_N_FRACT) || (result & CPP_N_ACCUM))
{
result |= CPP_N_FLOATING;
/* We need to restore the radix to 10, if the radix is 8. */
if (radix == 8)
radix = 10;
if (CPP_PEDANTIC (pfile))
cpp_error_with_line (pfile, CPP_DL_PEDWARN, virtual_location, 0,
"fixed-point constants are a GCC extension");
goto syntax_ok;
}
else
result = 0;
}
if (float_flag != NOT_FLOAT && radix == 8)
radix = 10;
if (max_digit >= radix)
{
if (radix == 2)
SYNTAX_ERROR2_AT (virtual_location,
"invalid digit \"%c\" in binary constant", '0' + max_digit);
else
SYNTAX_ERROR2_AT (virtual_location,
"invalid digit \"%c\" in octal constant", '0' + max_digit);
}
if (float_flag != NOT_FLOAT)
{
if (radix == 2)
{
cpp_error_with_line (pfile, CPP_DL_ERROR, virtual_location, 0,
"invalid prefix \"0b\" for floating constant");
return CPP_N_INVALID;
}
if (radix == 16 && !seen_digit)
SYNTAX_ERROR_AT (virtual_location,
"no digits in hexadecimal floating constant");
if (radix == 16 && CPP_PEDANTIC (pfile)
&& !CPP_OPTION (pfile, extended_numbers))
{
if (CPP_OPTION (pfile, cplusplus))
cpp_error_with_line (pfile, CPP_DL_PEDWARN, virtual_location, 0,
"use of C++17 hexadecimal floating constant");
else
cpp_error_with_line (pfile, CPP_DL_PEDWARN, virtual_location, 0,
"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))
{
if (DIGIT_SEP (*str))
SYNTAX_ERROR_AT (virtual_location,
"digit separator adjacent to exponent");
else
SYNTAX_ERROR_AT (virtual_location, "exponent has no digits");
}
do
{
seen_digit_sep = DIGIT_SEP (*str);
str++;
}
while (ISDIGIT (*str) || DIGIT_SEP (*str));
}
else if (radix == 16)
SYNTAX_ERROR_AT (virtual_location,
"hexadecimal floating constants require an exponent");
if (seen_digit_sep)
SYNTAX_ERROR_AT (virtual_location,
"digit separator outside digit sequence");
result = interpret_float_suffix (pfile, str, limit - str);
if (result == 0)
{
if (CPP_OPTION (pfile, user_literals))
{
if (ud_suffix)
*ud_suffix = (const char *) str;
result = CPP_N_LARGE | CPP_N_USERDEF;
}
else
{
cpp_error_with_line (pfile, CPP_DL_ERROR, virtual_location, 0,
"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_warning_with_line (pfile, CPP_W_TRADITIONAL, virtual_location, 0,
"traditional C rejects the \"%.*s\" suffix",
(int) (limit - str), str);
/* A suffix for double is a GCC extension via decimal float support.
If the suffix also specifies an imaginary value we'll catch that
later. */
if ((result == CPP_N_MEDIUM) && CPP_PEDANTIC (pfile))
cpp_error_with_line (pfile, CPP_DL_PEDWARN, virtual_location, 0,
"suffix for double constant is a GCC extension");
/* Radix must be 10 for decimal floats. */
if ((result & CPP_N_DFLOAT) && radix != 10)
{
cpp_error_with_line (pfile, CPP_DL_ERROR, virtual_location, 0,
"invalid suffix \"%.*s\" with hexadecimal floating constant",
(int) (limit - str), str);
return CPP_N_INVALID;
}
if ((result & (CPP_N_FRACT | CPP_N_ACCUM)) && CPP_PEDANTIC (pfile))
cpp_error_with_line (pfile, CPP_DL_PEDWARN, virtual_location, 0,
"fixed-point constants are a GCC extension");
if ((result & CPP_N_DFLOAT) && CPP_PEDANTIC (pfile))
cpp_error_with_line (pfile, CPP_DL_PEDWARN, virtual_location, 0,
"decimal float constants are a GCC extension");
result |= CPP_N_FLOATING;
}
else
{
result = interpret_int_suffix (pfile, str, limit - str);
if (result == 0)
{
if (CPP_OPTION (pfile, user_literals))
{
if (ud_suffix)
*ud_suffix = (const char *) str;
result = CPP_N_UNSIGNED | CPP_N_LARGE | CPP_N_USERDEF;
}
else
{
cpp_error_with_line (pfile, CPP_DL_ERROR, virtual_location, 0,
"invalid suffix \"%.*s\" on integer constant",
(int) (limit - str), str);
return CPP_N_INVALID;
}
}
/* 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
&& CPP_OPTION (pfile, cpp_warn_long_long);
if (u_or_i || large)
cpp_warning_with_line (pfile, large ? CPP_W_LONG_LONG : CPP_W_TRADITIONAL,
virtual_location, 0,
"traditional C rejects the \"%.*s\" suffix",
(int) (limit - str), str);
}
if ((result & CPP_N_WIDTH) == CPP_N_LARGE
&& CPP_OPTION (pfile, cpp_warn_long_long))
{
const char *message = CPP_OPTION (pfile, cplusplus)
? N_("use of C++11 long long integer constant")
: N_("use of C99 long long integer constant");
if (CPP_OPTION (pfile, c99))
cpp_warning_with_line (pfile, CPP_W_LONG_LONG, virtual_location,
0, message);
else
cpp_pedwarning_with_line (pfile, CPP_W_LONG_LONG,
virtual_location, 0, message);
}
result |= CPP_N_INTEGER;
}
syntax_ok:
if ((result & CPP_N_IMAGINARY) && CPP_PEDANTIC (pfile))
cpp_error_with_line (pfile, CPP_DL_PEDWARN, virtual_location, 0,
"imaginary constants are a GCC extension");
if (radix == 2
&& !CPP_OPTION (pfile, binary_constants)
&& CPP_PEDANTIC (pfile))
cpp_error_with_line (pfile, CPP_DL_PEDWARN, virtual_location, 0,
CPP_OPTION (pfile, cplusplus)
? N_("binary constants are a C++14 feature "
"or GCC extension")
: N_("binary constants are a GCC extension"));
if (radix == 10)
result |= CPP_N_DECIMAL;
else if (radix == 16)
result |= CPP_N_HEX;
else if (radix == 2)
result |= CPP_N_BINARY;
else
result |= CPP_N_OCTAL;
return result;
syntax_error:
return CPP_N_INVALID;
}
/* 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)
{
const uchar *p, *end;
cpp_num result;
result.low = 0;
result.high = 0;
result.unsignedp = !!(type & CPP_N_UNSIGNED);
result.overflow = false;
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
{
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)
{
base = 16;
p += 2;
}
else if ((type & CPP_N_RADIX) == CPP_N_BINARY)
{
base = 2;
p += 2;
}
/* 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++)
{
c = *p;
if (ISDIGIT (c) || (base == 16 && ISXDIGIT (c)))
c = hex_value (c);
else if (DIGIT_SEP (c))
continue;
else
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 && !(type & CPP_N_USERDEF))
cpp_error (pfile, CPP_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))
{
/* This is for constants within the range of uintmax_t but
not that of intmax_t. For such decimal constants, a
diagnostic is required for C99 as the selected type must
be signed and not having a type is a constraint violation
(DR#298, TC3), so this must be a pedwarn. For C90,
unsigned long is specified to be used for a constant that
does not fit in signed long; if uintmax_t has the same
range as unsigned long this means only a warning is
appropriate here. C90 permits the preprocessor to use a
wider range than unsigned long in the compiler, so if
uintmax_t is wider than unsigned long no diagnostic is
required for such constants in preprocessor #if
expressions and the compiler will pedwarn for such
constants outside the range of unsigned long that reach
the compiler so a diagnostic is not required there
either; thus, pedwarn for C99 but use a plain warning for
C90. */
if (base == 10)
cpp_error (pfile, (CPP_OPTION (pfile, c99)
? CPP_DL_PEDWARN
: CPP_DL_WARNING),
"integer constant is so large that it is unsigned");
result.unsignedp = true;
}
}
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;
bool overflow;
cpp_num_part add_high, add_low;
/* Multiply by 2, 8 or 16. Catching this overflow here means we don't
need to worry about add_high overflowing. */
switch (base)
{
case 2:
shift = 1;
break;
case 16:
shift = 4;
break;
default:
shift = 3;
}
overflow = !!(num.high >> (PART_PRECISION - shift));
result.high = num.high << shift;
result.low = num.low << shift;
result.high |= num.low >> (PART_PRECISION - shift);
result.unsignedp = num.unsignedp;
if (base == 10)
{
add_low = num.low << 1;
add_high = (num.high << 1) + (num.low >> (PART_PRECISION - 1));
}
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;
result.overflow = overflow;