diff options
Diffstat (limited to 'contrib/gdb/gdb/doublest.c')
| -rw-r--r-- | contrib/gdb/gdb/doublest.c | 64 |
1 files changed, 50 insertions, 14 deletions
diff --git a/contrib/gdb/gdb/doublest.c b/contrib/gdb/gdb/doublest.c index a4b4b76..3f283e1 100644 --- a/contrib/gdb/gdb/doublest.c +++ b/contrib/gdb/gdb/doublest.c @@ -1,7 +1,8 @@ /* Floating point routines for GDB, the GNU debugger. - Copyright 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, - 1997, 1998, 1999, 2000, 2001 - Free Software Foundation, Inc. + + Copyright 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, + 1996, 1997, 1998, 1999, 2000, 2001, 2003 Free Software Foundation, + Inc. This file is part of GDB. @@ -172,8 +173,10 @@ convert_floatformat_to_doublest (const struct floatformat *fmt, special_exponent = exponent == 0 || exponent == fmt->exp_nan; -/* Don't bias NaNs. Use minimum exponent for denorms. For simplicity, - we don't check for zero as the exponent doesn't matter. */ + /* Don't bias NaNs. Use minimum exponent for denorms. For simplicity, + we don't check for zero as the exponent doesn't matter. Note the cast + to int; exp_bias is unsigned, so it's important to make sure the + operation is done in signed arithmetic. */ if (!special_exponent) exponent -= fmt->exp_bias; else if (exponent == 0) @@ -401,7 +404,15 @@ convert_doublest_to_floatformat (CONST struct floatformat *fmt, { mant_long <<= 1; mant_long &= 0xffffffffL; - mant_bits -= 1; + /* If we are processing the top 32 mantissa bits of a doublest + so as to convert to a float value with implied integer bit, + we will only be putting 31 of those 32 bits into the + final value due to the discarding of the top bit. In the + case of a small float value where the number of mantissa + bits is less than 32, discarding the top bit does not alter + the number of bits we will be adding to the result. */ + if (mant_bits == 32) + mant_bits -= 1; } if (mant_bits < 32) @@ -622,7 +633,7 @@ floatformat_from_doublest (const struct floatformat *fmt, target-dependent code, the format of floating-point types is known, but not passed on by GDB. This should be fixed. */ -const struct floatformat * +static const struct floatformat * floatformat_from_length (int len) { if (len * TARGET_CHAR_BIT == TARGET_FLOAT_BIT) @@ -631,6 +642,14 @@ floatformat_from_length (int len) return TARGET_DOUBLE_FORMAT; else if (len * TARGET_CHAR_BIT == TARGET_LONG_DOUBLE_BIT) return TARGET_LONG_DOUBLE_FORMAT; + /* On i386 the 'long double' type takes 96 bits, + while the real number of used bits is only 80, + both in processor and in memory. + The code below accepts the real bit size. */ + else if ((TARGET_LONG_DOUBLE_FORMAT != NULL) + && (len * TARGET_CHAR_BIT == + TARGET_LONG_DOUBLE_FORMAT->totalsize)) + return TARGET_LONG_DOUBLE_FORMAT; return NULL; } @@ -653,15 +672,15 @@ floatformat_from_type (const struct type *type) /* Extract a floating-point number of length LEN from a target-order byte-stream at ADDR. Returns the value as type DOUBLEST. */ -DOUBLEST -extract_floating (const void *addr, int len) +static DOUBLEST +extract_floating_by_length (const void *addr, int len) { const struct floatformat *fmt = floatformat_from_length (len); DOUBLEST val; if (fmt == NULL) { - warning ("Can't store a floating-point number of %d bytes.", len); + warning ("Can't extract a floating-point number of %d bytes.", len); return NAN; } @@ -669,11 +688,17 @@ extract_floating (const void *addr, int len) return val; } +DOUBLEST +deprecated_extract_floating (const void *addr, int len) +{ + return extract_floating_by_length (addr, len); +} + /* Store VAL as a floating-point number of length LEN to a target-order byte-stream at ADDR. */ -void -store_floating (void *addr, int len, DOUBLEST val) +static void +store_floating_by_length (void *addr, int len, DOUBLEST val) { const struct floatformat *fmt = floatformat_from_length (len); @@ -681,11 +706,18 @@ store_floating (void *addr, int len, DOUBLEST val) { warning ("Can't store a floating-point number of %d bytes.", len); memset (addr, 0, len); + return; } floatformat_from_doublest (fmt, &val, addr); } +void +deprecated_store_floating (void *addr, int len, DOUBLEST val) +{ + store_floating_by_length (addr, len, val); +} + /* Extract a floating-point number of type TYPE from a target-order byte-stream at ADDR. Returns the value as type DOUBLEST. */ @@ -697,7 +729,9 @@ extract_typed_floating (const void *addr, const struct type *type) gdb_assert (TYPE_CODE (type) == TYPE_CODE_FLT); if (TYPE_FLOATFORMAT (type) == NULL) - return extract_floating (addr, TYPE_LENGTH (type)); + /* Not all code remembers to set the FLOATFORMAT (language + specific code? stabs?) so handle that here as a special case. */ + return extract_floating_by_length (addr, TYPE_LENGTH (type)); floatformat_to_doublest (TYPE_FLOATFORMAT (type), addr, &retval); return retval; @@ -732,7 +766,9 @@ store_typed_floating (void *addr, const struct type *type, DOUBLEST val) memset (addr, 0, TYPE_LENGTH (type)); if (TYPE_FLOATFORMAT (type) == NULL) - store_floating (addr, TYPE_LENGTH (type), val); + /* Not all code remembers to set the FLOATFORMAT (language + specific code? stabs?) so handle that here as a special case. */ + store_floating_by_length (addr, TYPE_LENGTH (type), val); else floatformat_from_doublest (TYPE_FLOATFORMAT (type), &val, addr); } |
