diff options
Diffstat (limited to 'gcc/c-common.c')
| -rw-r--r-- | gcc/c-common.c | 473 |
1 files changed, 5 insertions, 468 deletions
diff --git a/gcc/c-common.c b/gcc/c-common.c index 983cd29..0065430 100644 --- a/gcc/c-common.c +++ b/gcc/c-common.c @@ -1,6 +1,6 @@ /* Subroutines shared by all languages that are variants of C. Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, - 2001, 2002 Free Software Foundation, Inc. + 2001, 2002, 2003 Free Software Foundation, Inc. This file is part of GCC. @@ -24,7 +24,6 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA #include "coretypes.h" #include "tm.h" #include "tree.h" -#include "real.h" #include "flags.h" #include "toplev.h" #include "output.h" @@ -40,9 +39,9 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA #include "cpplib.h" #include "target.h" #include "langhooks.h" -#include "except.h" /* For USING_SJLJ_EXCEPTIONS. */ #include "tree-inline.h" + cpp_reader *parse_in; /* Declared in c-pragma.h. */ /* We let tm.h override the types used here, to handle trivial differences @@ -87,10 +86,6 @@ cpp_reader *parse_in; /* Declared in c-pragma.h. */ : "long long unsigned int")) #endif -#ifndef REGISTER_PREFIX -#define REGISTER_PREFIX "" -#endif - /* The variant of the C language being processed. */ enum c_language_kind c_language; @@ -806,18 +801,6 @@ static void check_nonnull_arg PARAMS ((void *, tree, static bool nonnull_check_p PARAMS ((tree, unsigned HOST_WIDE_INT)); static bool get_nonnull_operand PARAMS ((tree, unsigned HOST_WIDE_INT *)); -void builtin_define_std PARAMS ((const char *)); -static void builtin_define_with_value PARAMS ((const char *, const char *, - int)); -static void builtin_define_with_int_value PARAMS ((const char *, - HOST_WIDE_INT)); -static void builtin_define_with_hex_fp_value PARAMS ((const char *, tree, - int, const char *, - const char *)); -static void builtin_define_type_max PARAMS ((const char *, tree, int)); -static void builtin_define_type_precision PARAMS ((const char *, tree)); -static void builtin_define_float_constants PARAMS ((const char *, - const char *, tree)); /* Table of machine-independent attributes common to all C-like languages. */ const struct attribute_spec c_common_attribute_table[] = @@ -4761,461 +4744,15 @@ boolean_increment (code, arg) return val; } -/* Define NAME with value TYPE precision. */ -static void -builtin_define_type_precision (name, type) - const char *name; - tree type; -{ - builtin_define_with_int_value (name, TYPE_PRECISION (type)); -} - -/* Define the float.h constants for TYPE using NAME_PREFIX and FP_SUFFIX. */ -static void -builtin_define_float_constants (name_prefix, fp_suffix, type) - const char *name_prefix; - const char *fp_suffix; - tree type; -{ - /* Used to convert radix-based values to base 10 values in several cases. - - In the max_exp -> max_10_exp conversion for 128-bit IEEE, we need at - least 6 significant digits for correct results. Using the fraction - formed by (log(2)*1e6)/(log(10)*1e6) overflows a 32-bit integer as an - intermediate; perhaps someone can find a better approximation, in the - mean time, I suspect using doubles won't harm the bootstrap here. */ - - const double log10_2 = .30102999566398119521; - double log10_b; - const struct real_format *fmt; - - char name[64], buf[128]; - int dig, min_10_exp, max_10_exp; - int decimal_dig; - - fmt = real_format_for_mode[TYPE_MODE (type) - QFmode]; - - /* The radix of the exponent representation. */ - if (type == float_type_node) - builtin_define_with_int_value ("__FLT_RADIX__", fmt->b); - log10_b = log10_2 * fmt->log2_b; - - /* The number of radix digits, p, in the floating-point significand. */ - sprintf (name, "__%s_MANT_DIG__", name_prefix); - builtin_define_with_int_value (name, fmt->p); - - /* The number of decimal digits, q, such that any floating-point number - with q decimal digits can be rounded into a floating-point number with - p radix b digits and back again without change to the q decimal digits, - - p log10 b if b is a power of 10 - floor((p - 1) log10 b) otherwise - */ - dig = (fmt->p - 1) * log10_b; - sprintf (name, "__%s_DIG__", name_prefix); - builtin_define_with_int_value (name, dig); - - /* The minimum negative int x such that b**(x-1) is a normalized float. */ - sprintf (name, "__%s_MIN_EXP__", name_prefix); - sprintf (buf, "(%d)", fmt->emin); - builtin_define_with_value (name, buf, 0); - - /* The minimum negative int x such that 10**x is a normalized float, - - ceil (log10 (b ** (emin - 1))) - = ceil (log10 (b) * (emin - 1)) - - Recall that emin is negative, so the integer truncation calculates - the ceiling, not the floor, in this case. */ - min_10_exp = (fmt->emin - 1) * log10_b; - sprintf (name, "__%s_MIN_10_EXP__", name_prefix); - sprintf (buf, "(%d)", min_10_exp); - builtin_define_with_value (name, buf, 0); - - /* The maximum int x such that b**(x-1) is a representable float. */ - sprintf (name, "__%s_MAX_EXP__", name_prefix); - builtin_define_with_int_value (name, fmt->emax); - - /* The maximum int x such that 10**x is in the range of representable - finite floating-point numbers, - - floor (log10((1 - b**-p) * b**emax)) - = floor (log10(1 - b**-p) + log10(b**emax)) - = floor (log10(1 - b**-p) + log10(b)*emax) - - The safest thing to do here is to just compute this number. But since - we don't link cc1 with libm, we cannot. We could implement log10 here - a series expansion, but that seems too much effort because: - - Note that the first term, for all extant p, is a number exceedingly close - to zero, but slightly negative. Note that the second term is an integer - scaling an irrational number, and that because of the floor we are only - interested in its integral portion. - - In order for the first term to have any effect on the integral portion - of the second term, the second term has to be exceedingly close to an - integer itself (e.g. 123.000000000001 or something). Getting a result - that close to an integer requires that the irrational multiplicand have - a long series of zeros in its expansion, which doesn't occur in the - first 20 digits or so of log10(b). - - Hand-waving aside, crunching all of the sets of constants above by hand - does not yield a case for which the first term is significant, which - in the end is all that matters. */ - max_10_exp = fmt->emax * log10_b; - sprintf (name, "__%s_MAX_10_EXP__", name_prefix); - builtin_define_with_int_value (name, max_10_exp); - - /* The number of decimal digits, n, such that any floating-point number - can be rounded to n decimal digits and back again without change to - the value. - - p * log10(b) if b is a power of 10 - ceil(1 + p * log10(b)) otherwise - - The only macro we care about is this number for the widest supported - floating type, but we want this value for rendering constants below. */ - { - double d_decimal_dig = 1 + fmt->p * log10_b; - decimal_dig = d_decimal_dig; - if (decimal_dig < d_decimal_dig) - decimal_dig++; - } - if (type == long_double_type_node) - builtin_define_with_int_value ("__DECIMAL_DIG__", decimal_dig); - - /* Since, for the supported formats, B is always a power of 2, we - construct the following numbers directly as a hexadecimal - constants. */ - - /* The maximum representable finite floating-point number, - (1 - b**-p) * b**emax */ - { - int i, n; - char *p; - - strcpy (buf, "0x0."); - n = fmt->p * fmt->log2_b; - for (i = 0, p = buf + 4; i + 3 < n; i += 4) - *p++ = 'f'; - if (i < n) - *p++ = "08ce"[n - i]; - sprintf (p, "p%d", fmt->emax * fmt->log2_b); - } - sprintf (name, "__%s_MAX__", name_prefix); - builtin_define_with_hex_fp_value (name, type, decimal_dig, buf, fp_suffix); - - /* The minimum normalized positive floating-point number, - b**(emin-1). */ - sprintf (name, "__%s_MIN__", name_prefix); - sprintf (buf, "0x1p%d", (fmt->emin - 1) * fmt->log2_b); - builtin_define_with_hex_fp_value (name, type, decimal_dig, buf, fp_suffix); - - /* The difference between 1 and the least value greater than 1 that is - representable in the given floating point type, b**(1-p). */ - sprintf (name, "__%s_EPSILON__", name_prefix); - sprintf (buf, "0x1p%d", (1 - fmt->p) * fmt->log2_b); - builtin_define_with_hex_fp_value (name, type, decimal_dig, buf, fp_suffix); - - /* For C++ std::numeric_limits<T>::denorm_min. The minimum denormalized - positive floating-point number, b**(emin-p). Zero for formats that - don't support denormals. */ - sprintf (name, "__%s_DENORM_MIN__", name_prefix); - if (fmt->has_denorm) - { - sprintf (buf, "0x1p%d", (fmt->emin - fmt->p) * fmt->log2_b); - builtin_define_with_hex_fp_value (name, type, decimal_dig, - buf, fp_suffix); - } - else - { - sprintf (buf, "0.0%s", fp_suffix); - builtin_define_with_value (name, buf, 0); - } - - /* For C++ std::numeric_limits<T>::has_infinity. */ - sprintf (name, "__%s_HAS_INFINITY__", name_prefix); - builtin_define_with_int_value (name, - MODE_HAS_INFINITIES (TYPE_MODE (type))); - /* For C++ std::numeric_limits<T>::has_quiet_NaN. We do not have a - predicate to distinguish a target that has both quiet and - signalling NaNs from a target that has only quiet NaNs or only - signalling NaNs, so we assume that a target that has any kind of - NaN has quiet NaNs. */ - sprintf (name, "__%s_HAS_QUIET_NAN__", name_prefix); - builtin_define_with_int_value (name, MODE_HAS_NANS (TYPE_MODE (type))); -} - -/* Hook that registers front end and target-specific built-ins. */ +/* Built-in macros for stddef.h, that require macros defined in this + file. */ void -cb_register_builtins (pfile) - cpp_reader *pfile; +c_stddef_cpp_builtins() { - /* -undef turns off target-specific built-ins. */ - if (flag_undef) - return; - - if (c_language == clk_cplusplus) - { - if (SUPPORTS_ONE_ONLY) - cpp_define (pfile, "__GXX_WEAK__=1"); - else - cpp_define (pfile, "__GXX_WEAK__=0"); - if (flag_exceptions) - cpp_define (pfile, "__EXCEPTIONS"); - if (warn_deprecated) - cpp_define (pfile, "__DEPRECATED"); - } - - /* represents the C++ ABI version, always defined so it can be used while - preprocessing C and assembler. */ - cpp_define (pfile, "__GXX_ABI_VERSION=102"); - - /* libgcc needs to know this. */ - if (USING_SJLJ_EXCEPTIONS) - cpp_define (pfile, "__USING_SJLJ_EXCEPTIONS__"); - - /* stddef.h needs to know these. */ builtin_define_with_value ("__SIZE_TYPE__", SIZE_TYPE, 0); builtin_define_with_value ("__PTRDIFF_TYPE__", PTRDIFF_TYPE, 0); builtin_define_with_value ("__WCHAR_TYPE__", MODIFIED_WCHAR_TYPE, 0); builtin_define_with_value ("__WINT_TYPE__", WINT_TYPE, 0); - - /* limits.h needs to know these. */ - builtin_define_type_max ("__SCHAR_MAX__", signed_char_type_node, 0); - builtin_define_type_max ("__SHRT_MAX__", short_integer_type_node, 0); - builtin_define_type_max ("__INT_MAX__", integer_type_node, 0); - builtin_define_type_max ("__LONG_MAX__", long_integer_type_node, 1); - builtin_define_type_max ("__LONG_LONG_MAX__", long_long_integer_type_node, 2); - builtin_define_type_max ("__WCHAR_MAX__", wchar_type_node, 0); - - builtin_define_type_precision ("__CHAR_BIT__", char_type_node); - - /* float.h needs to know these. */ - - builtin_define_with_int_value ("__FLT_EVAL_METHOD__", - TARGET_FLT_EVAL_METHOD); - - builtin_define_float_constants ("FLT", "F", float_type_node); - builtin_define_float_constants ("DBL", "", double_type_node); - builtin_define_float_constants ("LDBL", "L", long_double_type_node); - - /* For use in assembly language. */ - builtin_define_with_value ("__REGISTER_PREFIX__", REGISTER_PREFIX, 0); - builtin_define_with_value ("__USER_LABEL_PREFIX__", user_label_prefix, 0); - - /* Misc. */ - builtin_define_with_value ("__VERSION__", version_string, 1); - - /* Other target-independent built-ins determined by command-line - options. */ - if (optimize_size) - cpp_define (pfile, "__OPTIMIZE_SIZE__"); - if (optimize) - cpp_define (pfile, "__OPTIMIZE__"); - - if (flag_hosted) - cpp_define (pfile, "__STDC_HOSTED__=1"); - else - cpp_define (pfile, "__STDC_HOSTED__=0"); - - if (fast_math_flags_set_p ()) - cpp_define (pfile, "__FAST_MATH__"); - if (flag_really_no_inline) - cpp_define (pfile, "__NO_INLINE__"); - if (flag_signaling_nans) - cpp_define (pfile, "__SUPPORT_SNAN__"); - if (flag_finite_math_only) - cpp_define (pfile, "__FINITE_MATH_ONLY__=1"); - else - cpp_define (pfile, "__FINITE_MATH_ONLY__=0"); - - if (flag_iso) - cpp_define (pfile, "__STRICT_ANSI__"); - - if (!flag_signed_char) - cpp_define (pfile, "__CHAR_UNSIGNED__"); - - if (c_language == clk_cplusplus && TREE_UNSIGNED (wchar_type_node)) - cpp_define (pfile, "__WCHAR_UNSIGNED__"); - - /* Make the choice of ObjC runtime visible to source code. */ - if (flag_objc && flag_next_runtime) - cpp_define (pfile, "__NEXT_RUNTIME__"); - - /* A straightforward target hook doesn't work, because of problems - linking that hook's body when part of non-C front ends. */ -# define preprocessing_asm_p() (cpp_get_options (pfile)->lang == CLK_ASM) -# define preprocessing_trad_p() (cpp_get_options (pfile)->traditional) -# define builtin_define(TXT) cpp_define (pfile, TXT) -# define builtin_assert(TXT) cpp_assert (pfile, TXT) - TARGET_CPU_CPP_BUILTINS (); - TARGET_OS_CPP_BUILTINS (); -} - -/* Pass an object-like macro. If it doesn't lie in the user's - namespace, defines it unconditionally. Otherwise define a version - with two leading underscores, and another version with two leading - and trailing underscores, and define the original only if an ISO - standard was not nominated. - - e.g. passing "unix" defines "__unix", "__unix__" and possibly - "unix". Passing "_mips" defines "__mips", "__mips__" and possibly - "_mips". */ -void -builtin_define_std (macro) - const char *macro; -{ - size_t len = strlen (macro); - char *buff = alloca (len + 5); - char *p = buff + 2; - char *q = p + len; - - /* prepend __ (or maybe just _) if in user's namespace. */ - memcpy (p, macro, len + 1); - if (!( *p == '_' && (p[1] == '_' || ISUPPER (p[1])))) - { - if (*p != '_') - *--p = '_'; - if (p[1] != '_') - *--p = '_'; - } - cpp_define (parse_in, p); - - /* If it was in user's namespace... */ - if (p != buff + 2) - { - /* Define the macro with leading and following __. */ - if (q[-1] != '_') - *q++ = '_'; - if (q[-2] != '_') - *q++ = '_'; - *q = '\0'; - cpp_define (parse_in, p); - - /* Finally, define the original macro if permitted. */ - if (!flag_iso) - cpp_define (parse_in, macro); - } -} - -/* Pass an object-like macro and a value to define it to. The third - parameter says whether or not to turn the value into a string - constant. */ -static void -builtin_define_with_value (macro, expansion, is_str) - const char *macro; - const char *expansion; - int is_str; -{ - char *buf; - size_t mlen = strlen (macro); - size_t elen = strlen (expansion); - size_t extra = 2; /* space for an = and a NUL */ - - if (is_str) - extra += 2; /* space for two quote marks */ - - buf = alloca (mlen + elen + extra); - if (is_str) - sprintf (buf, "%s=\"%s\"", macro, expansion); - else - sprintf (buf, "%s=%s", macro, expansion); - - cpp_define (parse_in, buf); -} - -/* Pass an object-like macro and an integer value to define it to. */ -static void -builtin_define_with_int_value (macro, value) - const char *macro; - HOST_WIDE_INT value; -{ - char *buf; - size_t mlen = strlen (macro); - size_t vlen = 18; - size_t extra = 2; /* space for = and NUL. */ - - buf = alloca (mlen + vlen + extra); - memcpy (buf, macro, mlen); - buf[mlen] = '='; - sprintf (buf + mlen + 1, HOST_WIDE_INT_PRINT_DEC, value); - - cpp_define (parse_in, buf); -} - -/* Pass an object-like macro a hexadecimal floating-point value. */ -static void -builtin_define_with_hex_fp_value (macro, type, digits, hex_str, fp_suffix) - const char *macro; - tree type ATTRIBUTE_UNUSED; - int digits; - const char *hex_str; - const char *fp_suffix; -{ - REAL_VALUE_TYPE real; - char dec_str[64], buf[256]; - - /* Hex values are really cool and convenient, except that they're - not supported in strict ISO C90 mode. First, the "p-" sequence - is not valid as part of a preprocessor number. Second, we get a - pedwarn from the preprocessor, which has no context, so we can't - suppress the warning with __extension__. - - So instead what we do is construct the number in hex (because - it's easy to get the exact correct value), parse it as a real, - then print it back out as decimal. */ - - real_from_string (&real, hex_str); - real_to_decimal (dec_str, &real, sizeof (dec_str), digits, 0); - - sprintf (buf, "%s=%s%s", macro, dec_str, fp_suffix); - cpp_define (parse_in, buf); -} - -/* Define MAX for TYPE based on the precision of the type. IS_LONG is - 1 for type "long" and 2 for "long long". We have to handle - unsigned types, since wchar_t might be unsigned. */ - -static void -builtin_define_type_max (macro, type, is_long) - const char *macro; - tree type; - int is_long; -{ - static const char *const values[] - = { "127", "255", - "32767", "65535", - "2147483647", "4294967295", - "9223372036854775807", "18446744073709551615", - "170141183460469231731687303715884105727", - "340282366920938463463374607431768211455" }; - static const char *const suffixes[] = { "", "U", "L", "UL", "LL", "ULL" }; - - const char *value, *suffix; - char *buf; - size_t idx; - - /* Pre-rendering the values mean we don't have to futz with printing a - multi-word decimal value. There are also a very limited number of - precisions that we support, so it's really a waste of time. */ - switch (TYPE_PRECISION (type)) - { - case 8: idx = 0; break; - case 16: idx = 2; break; - case 32: idx = 4; break; - case 64: idx = 6; break; - case 128: idx = 8; break; - default: abort (); - } - - value = values[idx + TREE_UNSIGNED (type)]; - suffix = suffixes[is_long * 2 + TREE_UNSIGNED (type)]; - - buf = alloca (strlen (macro) + 1 + strlen (value) + strlen (suffix) + 1); - sprintf (buf, "%s=%s%s", macro, value, suffix); - - cpp_define (parse_in, buf); } static void |