/* Floating point routines for GDB, the GNU debugger.
- Copyright (C) 2017 Free Software Foundation, Inc.
+ Copyright (C) 2017-2019 Free Software Foundation, Inc.
This file is part of GDB.
#include "gdbtypes.h"
#include "floatformat.h"
#include "target-float.h"
+#include "gdbarch.h"
+/* Target floating-point operations.
-/* Helper routines operating on binary floating-point data. */
+ We provide multiple implementations of those operations, which differ
+ by the host-side intermediate format they perform computations in.
-#include <math.h>
+ Those multiple implementations all derive from the following abstract
+ base class, which specifies the set of operations to be implemented. */
-#if (defined HAVE_LONG_DOUBLE && defined PRINTF_HAS_LONG_DOUBLE \
- && defined SCANF_HAS_LONG_DOUBLE)
-typedef long double DOUBLEST;
-#else
-typedef double DOUBLEST;
-/* If we can't scan or print long double, we don't want to use it
- anywhere. */
-# undef HAVE_LONG_DOUBLE
-# undef PRINTF_HAS_LONG_DOUBLE
-# undef SCANF_HAS_LONG_DOUBLE
-#endif
+class target_float_ops
+{
+public:
+ virtual std::string to_string (const gdb_byte *addr, const struct type *type,
+ const char *format) const = 0;
+ virtual bool from_string (gdb_byte *addr, const struct type *type,
+ const std::string &string) const = 0;
+
+ virtual LONGEST to_longest (const gdb_byte *addr,
+ const struct type *type) const = 0;
+ virtual void from_longest (gdb_byte *addr, const struct type *type,
+ LONGEST val) const = 0;
+ virtual void from_ulongest (gdb_byte *addr, const struct type *type,
+ ULONGEST val) const = 0;
+ virtual double to_host_double (const gdb_byte *addr,
+ const struct type *type) const = 0;
+ virtual void from_host_double (gdb_byte *addr, const struct type *type,
+ double val) const = 0;
+ virtual void convert (const gdb_byte *from, const struct type *from_type,
+ gdb_byte *to, const struct type *to_type) const = 0;
+
+ virtual void binop (enum exp_opcode opcode,
+ const gdb_byte *x, const struct type *type_x,
+ const gdb_byte *y, const struct type *type_y,
+ gdb_byte *res, const struct type *type_res) const = 0;
+ virtual int compare (const gdb_byte *x, const struct type *type_x,
+ const gdb_byte *y, const struct type *type_y) const = 0;
+};
+
+
+/* Helper routines operating on binary floating-point data. */
+
+#include <cmath>
+#include <limits>
/* Different kinds of floatformat numbers recognized by
floatformat_classify. To avoid portability issues, we use local
return res;
}
-/* Convert TO/FROM target to the hosts DOUBLEST floating-point format.
+/* Convert printf format string FORMAT to the otherwise equivalent string
+ which may be used to print a host floating-point number using the length
+ modifier LENGTH (which may be 0 if none is needed). If FORMAT is null,
+ return a format appropriate to print the full precision of a target
+ floating-point number of format FMT. */
+static std::string
+floatformat_printf_format (const struct floatformat *fmt,
+ const char *format, char length)
+{
+ std::string host_format;
+ char conversion;
+
+ if (format == nullptr)
+ {
+ /* If no format was specified, print the number using a format string
+ where the precision is set to the DECIMAL_DIG value for the given
+ floating-point format. This value is computed as
+
+ ceil(1 + p * log10(b)),
+
+ where p is the precision of the floating-point format in bits, and
+ b is the base (which is always 2 for the formats we support). */
+ const double log10_2 = .30102999566398119521;
+ double d_decimal_dig = 1 + floatformat_precision (fmt) * log10_2;
+ int decimal_dig = d_decimal_dig;
+ if (decimal_dig < d_decimal_dig)
+ decimal_dig++;
+
+ host_format = string_printf ("%%.%d", decimal_dig);
+ conversion = 'g';
+ }
+ else
+ {
+ /* Use the specified format, stripping out the conversion character
+ and length modifier, if present. */
+ size_t len = strlen (format);
+ gdb_assert (len > 1);
+ conversion = format[--len];
+ gdb_assert (conversion == 'e' || conversion == 'f' || conversion == 'g'
+ || conversion == 'E' || conversion == 'G');
+ if (format[len - 1] == 'L')
+ len--;
+
+ host_format = std::string (format, len);
+ }
+
+ /* Add the length modifier and conversion character appropriate for
+ handling the appropriate host floating-point type. */
+ if (length)
+ host_format += length;
+ host_format += conversion;
+
+ return host_format;
+}
+
+/* Implementation of target_float_ops using the host floating-point type T
+ as intermediate type. */
+
+template<typename T> class host_float_ops : public target_float_ops
+{
+public:
+ std::string to_string (const gdb_byte *addr, const struct type *type,
+ const char *format) const override;
+ bool from_string (gdb_byte *addr, const struct type *type,
+ const std::string &string) const override;
+
+ LONGEST to_longest (const gdb_byte *addr,
+ const struct type *type) const override;
+ void from_longest (gdb_byte *addr, const struct type *type,
+ LONGEST val) const override;
+ void from_ulongest (gdb_byte *addr, const struct type *type,
+ ULONGEST val) const override;
+ double to_host_double (const gdb_byte *addr,
+ const struct type *type) const override;
+ void from_host_double (gdb_byte *addr, const struct type *type,
+ double val) const override;
+ void convert (const gdb_byte *from, const struct type *from_type,
+ gdb_byte *to, const struct type *to_type) const override;
+
+ void binop (enum exp_opcode opcode,
+ const gdb_byte *x, const struct type *type_x,
+ const gdb_byte *y, const struct type *type_y,
+ gdb_byte *res, const struct type *type_res) const override;
+ int compare (const gdb_byte *x, const struct type *type_x,
+ const gdb_byte *y, const struct type *type_y) const override;
+
+private:
+ void from_target (const struct floatformat *fmt,
+ const gdb_byte *from, T *to) const;
+ void from_target (const struct type *type,
+ const gdb_byte *from, T *to) const;
+
+ void to_target (const struct type *type,
+ const T *from, gdb_byte *to) const;
+ void to_target (const struct floatformat *fmt,
+ const T *from, gdb_byte *to) const;
+};
+
+
+/* Convert TO/FROM target to the host floating-point format T.
If the host and target formats agree, we just copy the raw data
into the appropriate type of variable and return, letting the host
static const struct floatformat *host_long_double_format
= GDB_HOST_LONG_DOUBLE_FORMAT;
-/* Convert from FMT to a DOUBLEST. FROM is the address of the extended float.
- Store the DOUBLEST in *TO. */
-static void
-floatformat_to_doublest (const struct floatformat *fmt,
- const void *from, DOUBLEST *to)
+/* Convert target floating-point value at FROM in format FMT to host
+ floating-point format of type T. */
+template<typename T> void
+host_float_ops<T>::from_target (const struct floatformat *fmt,
+ const gdb_byte *from, T *to) const
{
gdb_assert (fmt != NULL);
}
unsigned char *ufrom = (unsigned char *) from;
- DOUBLEST dto;
long exponent;
unsigned long mant;
unsigned int mant_bits, mant_off;
floatformat_to_double (fmt->split_half ? fmt->split_half : fmt,
from, &dto);
- *to = (DOUBLEST) dto;
+ *to = (T) dto;
return;
}
if (fmt->split_half)
{
- DOUBLEST dtop, dbot;
+ T dtop, dbot;
- floatformat_to_doublest (fmt->split_half, ufrom, &dtop);
+ from_target (fmt->split_half, ufrom, &dtop);
/* Preserve the sign of 0, which is the sign of the top
half. */
if (dtop == 0.0)
*to = dtop;
return;
}
- floatformat_to_doublest (fmt->split_half,
- ufrom + fmt->totalsize / FLOATFORMAT_CHAR_BIT / 2,
- &dbot);
+ from_target (fmt->split_half,
+ ufrom + fmt->totalsize / FLOATFORMAT_CHAR_BIT / 2, &dbot);
*to = dtop + dbot;
return;
}
mant_bits_left = fmt->man_len;
mant_off = fmt->man_start;
- dto = 0.0;
+ T dto = 0.0;
special_exponent = exponent == 0 || exponent == fmt->exp_nan;
mant = get_field (ufrom, order, fmt->totalsize, mant_off, mant_bits);
- dto += ldexp ((double) mant, exponent - mant_bits);
+ dto += ldexp ((T) mant, exponent - mant_bits);
exponent -= mant_bits;
mant_off += mant_bits;
mant_bits_left -= mant_bits;
*to = dto;
}
-/* Convert the DOUBLEST *FROM to an extended float in format FMT and
- store where TO points. */
-static void
-floatformat_from_doublest (const struct floatformat *fmt,
- const DOUBLEST *from, void *to)
+template<typename T> void
+host_float_ops<T>::from_target (const struct type *type,
+ const gdb_byte *from, T *to) const
+{
+ from_target (floatformat_from_type (type), from, to);
+}
+
+/* Convert host floating-point value of type T to target floating-point
+ value in format FMT and store at TO. */
+template<typename T> void
+host_float_ops<T>::to_target (const struct floatformat *fmt,
+ const T *from, gdb_byte *to) const
{
gdb_assert (fmt != NULL);
return;
}
- DOUBLEST dfrom;
+ T dfrom;
int exponent;
- DOUBLEST mant;
+ T mant;
unsigned int mant_bits, mant_off;
int mant_bits_left;
unsigned char *uto = (unsigned char *) to;
removed via storing in memory, and so the top half really is
the result of converting to double. */
static volatile double dtop, dbot;
- DOUBLEST dtopnv, dbotnv;
+ T dtopnv, dbotnv;
dtop = (double) dfrom;
/* If the rounded top half is Inf, the bottom must be 0 not NaN
if (dtop + dtop == dtop && dtop != 0.0)
dbot = 0.0;
else
- dbot = (double) (dfrom - (DOUBLEST) dtop);
+ dbot = (double) (dfrom - (T) dtop);
dtopnv = dtop;
dbotnv = dbot;
- floatformat_from_doublest (fmt->split_half, &dtopnv, uto);
- floatformat_from_doublest (fmt->split_half, &dbotnv,
- (uto
- + fmt->totalsize / FLOATFORMAT_CHAR_BIT / 2));
+ to_target (fmt->split_half, &dtopnv, uto);
+ to_target (fmt->split_half, &dbotnv,
+ uto + fmt->totalsize / FLOATFORMAT_CHAR_BIT / 2);
return;
}
goto finalize_byteorder;
}
-#ifdef HAVE_LONG_DOUBLE
- mant = frexpl (dfrom, &exponent);
-#else
mant = frexp (dfrom, &exponent);
-#endif
if (exponent + fmt->exp_bias <= 0)
{
floatformat_normalize_byteorder (fmt, newto, to);
}
-/* Convert the byte-stream ADDR, interpreted as floating-point format FMT,
- to a string, optionally using the print format FORMAT. */
-static std::string
-floatformat_to_string (const struct floatformat *fmt,
- const gdb_byte *in, const char *format)
+template<typename T> void
+host_float_ops<T>::to_target (const struct type *type,
+ const T *from, gdb_byte *to) const
{
- /* Unless we need to adhere to a specific format, provide special
- output for certain cases. */
- if (format == nullptr)
- {
- /* Detect invalid representations. */
- if (!floatformat_is_valid (fmt, in))
- return "<invalid float value>";
+ /* Ensure possible padding bytes in the target buffer are zeroed out. */
+ memset (to, 0, TYPE_LENGTH (type));
- /* Handle NaN and Inf. */
- enum float_kind kind = floatformat_classify (fmt, in);
- if (kind == float_nan)
- {
- const char *sign = floatformat_is_negative (fmt, in)? "-" : "";
- const char *mantissa = floatformat_mantissa (fmt, in);
- return string_printf ("%snan(0x%s)", sign, mantissa);
- }
- else if (kind == float_infinite)
- {
- const char *sign = floatformat_is_negative (fmt, in)? "-" : "";
- return string_printf ("%sinf", sign);
- }
- }
+ to_target (floatformat_from_type (type), from, to);
+}
+/* Convert the byte-stream ADDR, interpreted as floating-point type TYPE,
+ to a string, optionally using the print format FORMAT. */
+template<typename T> struct printf_length_modifier
+{
+ static constexpr char value = 0;
+};
+template<> struct printf_length_modifier<long double>
+{
+ static constexpr char value = 'L';
+};
+template<typename T> std::string
+host_float_ops<T>::to_string (const gdb_byte *addr, const struct type *type,
+ const char *format) const
+{
/* Determine the format string to use on the host side. */
- std::string host_format;
- char conversion;
-
- if (format == nullptr)
- {
- /* If no format was specified, print the number using a format string
- where the precision is set to the DECIMAL_DIG value for the given
- floating-point format. This value is computed as
-
- ceil(1 + p * log10(b)),
-
- where p is the precision of the floating-point format in bits, and
- b is the base (which is always 2 for the formats we support). */
- const double log10_2 = .30102999566398119521;
- double d_decimal_dig = 1 + floatformat_precision (fmt) * log10_2;
- int decimal_dig = d_decimal_dig;
- if (decimal_dig < d_decimal_dig)
- decimal_dig++;
-
- host_format = string_printf ("%%.%d", decimal_dig);
- conversion = 'g';
- }
- else
- {
- /* Use the specified format, stripping out the conversion character
- and length modifier, if present. */
- size_t len = strlen (format);
- gdb_assert (len > 1);
- conversion = format[--len];
- gdb_assert (conversion == 'e' || conversion == 'f' || conversion == 'g'
- || conversion == 'E' || conversion == 'G');
- if (format[len - 1] == 'L')
- len--;
-
- host_format = std::string (format, len);
- }
+ constexpr char length = printf_length_modifier<T>::value;
+ const struct floatformat *fmt = floatformat_from_type (type);
+ std::string host_format = floatformat_printf_format (fmt, format, length);
- /* Add the length modifier and conversion character appropriate for
- handling the host DOUBLEST type. */
-#ifdef HAVE_LONG_DOUBLE
- host_format += 'L';
-#endif
- host_format += conversion;
+ T host_float;
+ from_target (type, addr, &host_float);
- DOUBLEST doub;
- floatformat_to_doublest (fmt, in, &doub);
- return string_printf (host_format.c_str (), doub);
+ DIAGNOSTIC_PUSH
+ DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL
+ return string_printf (host_format.c_str (), host_float);
+ DIAGNOSTIC_POP
}
-/* Parse string STRING into a target floating-number of format FMT and
+/* Parse string IN into a target floating-number of type TYPE and
store it as byte-stream ADDR. Return whether parsing succeeded. */
-static bool
-floatformat_from_string (const struct floatformat *fmt, gdb_byte *out,
- const std::string &in)
+template<typename T> struct scanf_length_modifier
+{
+ static constexpr char value = 0;
+};
+template<> struct scanf_length_modifier<double>
+{
+ static constexpr char value = 'l';
+};
+template<> struct scanf_length_modifier<long double>
{
- DOUBLEST doub;
+ static constexpr char value = 'L';
+};
+template<typename T> bool
+host_float_ops<T>::from_string (gdb_byte *addr, const struct type *type,
+ const std::string &in) const
+{
+ T host_float;
int n, num;
-#ifdef HAVE_LONG_DOUBLE
- const char *scan_format = "%Lg%n";
-#else
- const char *scan_format = "%lg%n";
-#endif
- num = sscanf (in.c_str (), scan_format, &doub, &n);
+
+ std::string scan_format = "%";
+ if (scanf_length_modifier<T>::value)
+ scan_format += scanf_length_modifier<T>::value;
+ scan_format += "g%n";
+
+ DIAGNOSTIC_PUSH
+ DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL
+ num = sscanf (in.c_str (), scan_format.c_str(), &host_float, &n);
+ DIAGNOSTIC_POP
/* The sscanf man page suggests not making any assumptions on the effect
of %n on the result, so we don't.
if (in[n])
return false;
- floatformat_from_doublest (fmt, &doub, out);
+ to_target (type, &host_float, addr);
return true;
}
-/* Convert the byte-stream ADDR, interpreted as floating-point format FMT,
+/* Convert the byte-stream ADDR, interpreted as floating-point type TYPE,
to an integer value (rounding towards zero). */
-static LONGEST
-floatformat_to_longest (const struct floatformat *fmt, const gdb_byte *addr)
+template<typename T> LONGEST
+host_float_ops<T>::to_longest (const gdb_byte *addr,
+ const struct type *type) const
{
- DOUBLEST d;
- floatformat_to_doublest (fmt, addr, &d);
- return (LONGEST) d;
+ T host_float;
+ from_target (type, addr, &host_float);
+ T min_possible_range = static_cast<T>(std::numeric_limits<LONGEST>::min());
+ T max_possible_range = -min_possible_range;
+ /* host_float can be converted to an integer as long as it's in
+ the range [min_possible_range, max_possible_range). If not, it is either
+ too large, or too small, or is NaN; in this case return the maximum or
+ minimum possible value. */
+ if (host_float < max_possible_range && host_float >= min_possible_range)
+ return static_cast<LONGEST> (host_float);
+ if (host_float < min_possible_range)
+ return std::numeric_limits<LONGEST>::min();
+ /* This line will be executed if host_float is NaN. */
+ return std::numeric_limits<LONGEST>::max();
}
-/* Convert signed integer VAL to a target floating-number of format FMT
+/* Convert signed integer VAL to a target floating-number of type TYPE
and store it as byte-stream ADDR. */
-static void
-floatformat_from_longest (const struct floatformat *fmt, gdb_byte *addr,
- LONGEST val)
+template<typename T> void
+host_float_ops<T>::from_longest (gdb_byte *addr, const struct type *type,
+ LONGEST val) const
{
- DOUBLEST d = (DOUBLEST) val;
- floatformat_from_doublest (fmt, &d, addr);
+ T host_float = (T) val;
+ to_target (type, &host_float, addr);
}
-/* Convert unsigned integer VAL to a target floating-number of format FMT
+/* Convert unsigned integer VAL to a target floating-number of type TYPE
and store it as byte-stream ADDR. */
-static void
-floatformat_from_ulongest (const struct floatformat *fmt, gdb_byte *addr,
- ULONGEST val)
+template<typename T> void
+host_float_ops<T>::from_ulongest (gdb_byte *addr, const struct type *type,
+ ULONGEST val) const
{
- DOUBLEST d = (DOUBLEST) val;
- floatformat_from_doublest (fmt, &d, addr);
+ T host_float = (T) val;
+ to_target (type, &host_float, addr);
}
-/* Convert the byte-stream ADDR, interpreted as floating-point format FMT,
+/* Convert the byte-stream ADDR, interpreted as floating-point type TYPE,
to a floating-point value in the host "double" format. */
-static double
-floatformat_to_host_double (const struct floatformat *fmt,
- const gdb_byte *addr)
+template<typename T> double
+host_float_ops<T>::to_host_double (const gdb_byte *addr,
+ const struct type *type) const
{
- DOUBLEST d;
- floatformat_to_doublest (fmt, addr, &d);
- return (double) d;
+ T host_float;
+ from_target (type, addr, &host_float);
+ return (double) host_float;
}
/* Convert floating-point value VAL in the host "double" format to a target
- floating-number of format FMT and store it as byte-stream ADDR. */
-static void
-floatformat_from_host_double (const struct floatformat *fmt, gdb_byte *addr,
- double val)
+ floating-number of type TYPE and store it as byte-stream ADDR. */
+template<typename T> void
+host_float_ops<T>::from_host_double (gdb_byte *addr, const struct type *type,
+ double val) const
{
- DOUBLEST d = (DOUBLEST) val;
- floatformat_from_doublest (fmt, &d, addr);
+ T host_float = (T) val;
+ to_target (type, &host_float, addr);
}
-/* Convert a floating-point number of format FROM_FMT from the target
- byte-stream FROM to a floating-point number of format TO_FMT, and
+/* Convert a floating-point number of type FROM_TYPE from the target
+ byte-stream FROM to a floating-point number of type TO_TYPE, and
store it to the target byte-stream TO. */
-static void
-floatformat_convert (const gdb_byte *from, const struct floatformat *from_fmt,
- gdb_byte *to, const struct floatformat *to_fmt)
+template<typename T> void
+host_float_ops<T>::convert (const gdb_byte *from,
+ const struct type *from_type,
+ gdb_byte *to,
+ const struct type *to_type) const
{
- if (from_fmt == to_fmt)
- {
- /* The floating-point formats match, so we simply copy the data. */
- memcpy (to, from, floatformat_totalsize_bytes (to_fmt));
- }
- else
- {
- /* The floating-point formats don't match. The best we can do
- (apart from simulating the target FPU) is converting to the
- widest floating-point type supported by the host, and then
- again to the desired type. */
- DOUBLEST d;
-
- floatformat_to_doublest (from_fmt, from, &d);
- floatformat_from_doublest (to_fmt, &d, to);
- }
+ T host_float;
+ from_target (from_type, from, &host_float);
+ to_target (to_type, &host_float, to);
}
/* Perform the binary operation indicated by OPCODE, using as operands the
target byte streams X and Y, interpreted as floating-point numbers of
- formats FMT_X and FMT_Y, respectively. Convert the result to format
- FMT_RES and store it into the byte-stream RES. */
-static void
-floatformat_binop (enum exp_opcode op,
- const struct floatformat *fmt_x, const gdb_byte *x,
- const struct floatformat *fmt_y, const gdb_byte *y,
- const struct floatformat *fmt_result, gdb_byte *result)
+ types TYPE_X and TYPE_Y, respectively. Convert the result to format
+ TYPE_RES and store it into the byte-stream RES. */
+template<typename T> void
+host_float_ops<T>::binop (enum exp_opcode op,
+ const gdb_byte *x, const struct type *type_x,
+ const gdb_byte *y, const struct type *type_y,
+ gdb_byte *res, const struct type *type_res) const
{
- DOUBLEST v1, v2, v = 0;
+ T v1, v2, v = 0;
- floatformat_to_doublest (fmt_x, x, &v1);
- floatformat_to_doublest (fmt_y, y, &v2);
+ from_target (type_x, x, &v1);
+ from_target (type_y, y, &v2);
switch (op)
{
break;
}
- floatformat_from_doublest (fmt_result, &v, result);
+ to_target (type_res, &v, res);
}
/* Compare the two target byte streams X and Y, interpreted as floating-point
- numbers of formats FMT_X and FMT_Y, respectively. Return zero if X and Y
+ numbers of types TYPE_X and TYPE_Y, respectively. Return zero if X and Y
are equal, -1 if X is less than Y, and 1 otherwise. */
-static int
-floatformat_compare (const struct floatformat *fmt_x, const gdb_byte *x,
- const struct floatformat *fmt_y, const gdb_byte *y)
+template<typename T> int
+host_float_ops<T>::compare (const gdb_byte *x, const struct type *type_x,
+ const gdb_byte *y, const struct type *type_y) const
{
- DOUBLEST v1, v2;
+ T v1, v2;
- floatformat_to_doublest (fmt_x, x, &v1);
- floatformat_to_doublest (fmt_y, y, &v2);
+ from_target (type_x, x, &v1);
+ from_target (type_y, y, &v2);
if (v1 == v2)
return 0;
}
-/* Helper routines operating on decimal floating-point data. */
-
-/* Decimal floating point is one of the extension to IEEE 754, which is
- described in http://grouper.ieee.org/groups/754/revision.html and
- http://www2.hursley.ibm.com/decimal/. It completes binary floating
- point by representing floating point more exactly. */
+/* Implementation of target_float_ops using the MPFR library
+ mpfr_t as intermediate type. */
-/* The order of the following headers is important for making sure
- decNumber structure is large enough to hold decimal128 digits. */
+#ifdef HAVE_LIBMPFR
-#include "dpd/decimal128.h"
-#include "dpd/decimal64.h"
-#include "dpd/decimal32.h"
+#define MPFR_USE_INTMAX_T
-/* When using decimal128, this is the maximum string length + 1
- (value comes from libdecnumber's DECIMAL128_String constant). */
-#define MAX_DECIMAL_STRING 43
+#include <mpfr.h>
-/* In GDB, we are using an array of gdb_byte to represent decimal values.
- They are stored in host byte order. This routine does the conversion if
- the target byte order is different. */
-static void
-match_endianness (const gdb_byte *from, int len, enum bfd_endian byte_order,
- gdb_byte *to)
+class mpfr_float_ops : public target_float_ops
{
- int i;
-
-#if WORDS_BIGENDIAN
-#define OPPOSITE_BYTE_ORDER BFD_ENDIAN_LITTLE
-#else
-#define OPPOSITE_BYTE_ORDER BFD_ENDIAN_BIG
-#endif
-
- if (byte_order == OPPOSITE_BYTE_ORDER)
- for (i = 0; i < len; i++)
- to[i] = from[len - i - 1];
- else
- for (i = 0; i < len; i++)
- to[i] = from[i];
+public:
+ std::string to_string (const gdb_byte *addr, const struct type *type,
+ const char *format) const override;
+ bool from_string (gdb_byte *addr, const struct type *type,
+ const std::string &string) const override;
+
+ LONGEST to_longest (const gdb_byte *addr,
+ const struct type *type) const override;
+ void from_longest (gdb_byte *addr, const struct type *type,
+ LONGEST val) const override;
+ void from_ulongest (gdb_byte *addr, const struct type *type,
+ ULONGEST val) const override;
+ double to_host_double (const gdb_byte *addr,
+ const struct type *type) const override;
+ void from_host_double (gdb_byte *addr, const struct type *type,
+ double val) const override;
+ void convert (const gdb_byte *from, const struct type *from_type,
+ gdb_byte *to, const struct type *to_type) const override;
+
+ void binop (enum exp_opcode opcode,
+ const gdb_byte *x, const struct type *type_x,
+ const gdb_byte *y, const struct type *type_y,
+ gdb_byte *res, const struct type *type_res) const override;
+ int compare (const gdb_byte *x, const struct type *type_x,
+ const gdb_byte *y, const struct type *type_y) const override;
+
+private:
+ /* Local wrapper class to handle mpfr_t initalization and cleanup. */
+ class gdb_mpfr
+ {
+ public:
+ mpfr_t val;
+
+ gdb_mpfr (const struct type *type)
+ {
+ const struct floatformat *fmt = floatformat_from_type (type);
+ mpfr_init2 (val, floatformat_precision (fmt));
+ }
- return;
-}
+ gdb_mpfr (const gdb_mpfr &source)
+ {
+ mpfr_init2 (val, mpfr_get_prec (source.val));
+ }
-/* Helper function to get the appropriate libdecnumber context for each size
- of decimal float. */
-static void
-set_decnumber_context (decContext *ctx, int len)
-{
- switch (len)
+ ~gdb_mpfr ()
{
- case 4:
- decContextDefault (ctx, DEC_INIT_DECIMAL32);
- break;
- case 8:
- decContextDefault (ctx, DEC_INIT_DECIMAL64);
- break;
- case 16:
- decContextDefault (ctx, DEC_INIT_DECIMAL128);
- break;
+ mpfr_clear (val);
}
+ };
- ctx->traps = 0;
-}
+ void from_target (const struct floatformat *fmt,
+ const gdb_byte *from, gdb_mpfr &to) const;
+ void from_target (const struct type *type,
+ const gdb_byte *from, gdb_mpfr &to) const;
-/* Check for errors signaled in the decimal context structure. */
-static void
-decimal_check_errors (decContext *ctx)
+ void to_target (const struct type *type,
+ const gdb_mpfr &from, gdb_byte *to) const;
+ void to_target (const struct floatformat *fmt,
+ const gdb_mpfr &from, gdb_byte *to) const;
+};
+
+
+/* Convert TO/FROM target floating-point format to mpfr_t. */
+
+void
+mpfr_float_ops::from_target (const struct floatformat *fmt,
+ const gdb_byte *orig_from, gdb_mpfr &to) const
{
- /* An error here could be a division by zero, an overflow, an underflow or
- an invalid operation (from the DEC_Errors constant in decContext.h).
- Since GDB doesn't complain about division by zero, overflow or underflow
- errors for binary floating, we won't complain about them for decimal
- floating either. */
- if (ctx->status & DEC_IEEE_854_Invalid_operation)
+ const gdb_byte *from = orig_from;
+ mpfr_exp_t exponent;
+ unsigned long mant;
+ unsigned int mant_bits, mant_off;
+ int mant_bits_left;
+ int special_exponent; /* It's a NaN, denorm or zero. */
+ enum floatformat_byteorders order;
+ unsigned char newfrom[FLOATFORMAT_LARGEST_BYTES];
+ enum float_kind kind;
+
+ gdb_assert (fmt->totalsize
+ <= FLOATFORMAT_LARGEST_BYTES * FLOATFORMAT_CHAR_BIT);
+
+ /* Handle non-numbers. */
+ kind = floatformat_classify (fmt, from);
+ if (kind == float_infinite)
{
- /* Leave only the error bits in the status flags. */
- ctx->status &= DEC_IEEE_854_Invalid_operation;
- error (_("Cannot perform operation: %s"),
- decContextStatusToString (ctx));
+ mpfr_set_inf (to.val, floatformat_is_negative (fmt, from) ? -1 : 1);
+ return;
+ }
+ if (kind == float_nan)
+ {
+ mpfr_set_nan (to.val);
+ return;
}
-}
-/* Helper function to convert from libdecnumber's appropriate representation
- for computation to each size of decimal float. */
-static void
-decimal_from_number (const decNumber *from, gdb_byte *to, int len)
-{
- decContext set;
+ order = floatformat_normalize_byteorder (fmt, from, newfrom);
- set_decnumber_context (&set, len);
+ if (order != fmt->byteorder)
+ from = newfrom;
- switch (len)
+ if (fmt->split_half)
{
- case 4:
- decimal32FromNumber ((decimal32 *) to, from, &set);
+ gdb_mpfr top (to), bot (to);
+
+ from_target (fmt->split_half, from, top);
+ /* Preserve the sign of 0, which is the sign of the top half. */
+ if (mpfr_zero_p (top.val))
+ {
+ mpfr_set (to.val, top.val, MPFR_RNDN);
+ return;
+ }
+ from_target (fmt->split_half,
+ from + fmt->totalsize / FLOATFORMAT_CHAR_BIT / 2, bot);
+ mpfr_add (to.val, top.val, bot.val, MPFR_RNDN);
+ return;
+ }
+
+ exponent = get_field (from, order, fmt->totalsize, fmt->exp_start,
+ fmt->exp_len);
+ /* Note that if exponent indicates a NaN, we can't really do anything useful
+ (not knowing if the host has NaN's, or how to build one). So it will
+ end up as an infinity or something close; that is OK. */
+
+ mant_bits_left = fmt->man_len;
+ mant_off = fmt->man_start;
+ mpfr_set_zero (to.val, 0);
+
+ 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.
+ 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)
+ exponent = 1 - fmt->exp_bias;
+
+ /* Build the result algebraically. Might go infinite, underflow, etc;
+ who cares. */
+
+ /* If this format uses a hidden bit, explicitly add it in now. Otherwise,
+ increment the exponent by one to account for the integer bit. */
+
+ if (!special_exponent)
+ {
+ if (fmt->intbit == floatformat_intbit_no)
+ mpfr_set_ui_2exp (to.val, 1, exponent, MPFR_RNDN);
+ else
+ exponent++;
+ }
+
+ gdb_mpfr tmp (to);
+
+ while (mant_bits_left > 0)
+ {
+ mant_bits = std::min (mant_bits_left, 32);
+
+ mant = get_field (from, order, fmt->totalsize, mant_off, mant_bits);
+
+ mpfr_set_ui (tmp.val, mant, MPFR_RNDN);
+ mpfr_mul_2si (tmp.val, tmp.val, exponent - mant_bits, MPFR_RNDN);
+ mpfr_add (to.val, to.val, tmp.val, MPFR_RNDN);
+ exponent -= mant_bits;
+ mant_off += mant_bits;
+ mant_bits_left -= mant_bits;
+ }
+
+ /* Negate it if negative. */
+ if (get_field (from, order, fmt->totalsize, fmt->sign_start, 1))
+ mpfr_neg (to.val, to.val, MPFR_RNDN);
+}
+
+void
+mpfr_float_ops::from_target (const struct type *type,
+ const gdb_byte *from, gdb_mpfr &to) const
+{
+ from_target (floatformat_from_type (type), from, to);
+}
+
+void
+mpfr_float_ops::to_target (const struct floatformat *fmt,
+ const gdb_mpfr &from, gdb_byte *orig_to) const
+{
+ unsigned char *to = orig_to;
+ mpfr_exp_t exponent;
+ unsigned int mant_bits, mant_off;
+ int mant_bits_left;
+ enum floatformat_byteorders order = fmt->byteorder;
+ unsigned char newto[FLOATFORMAT_LARGEST_BYTES];
+
+ if (order != floatformat_little)
+ order = floatformat_big;
+
+ if (order != fmt->byteorder)
+ to = newto;
+
+ memset (to, 0, floatformat_totalsize_bytes (fmt));
+
+ if (fmt->split_half)
+ {
+ gdb_mpfr top (from), bot (from);
+
+ mpfr_set (top.val, from.val, MPFR_RNDN);
+ /* If the rounded top half is Inf, the bottom must be 0 not NaN
+ or Inf. */
+ if (mpfr_inf_p (top.val))
+ mpfr_set_zero (bot.val, 0);
+ else
+ mpfr_sub (bot.val, from.val, top.val, MPFR_RNDN);
+
+ to_target (fmt->split_half, top, to);
+ to_target (fmt->split_half, bot,
+ to + fmt->totalsize / FLOATFORMAT_CHAR_BIT / 2);
+ return;
+ }
+
+ gdb_mpfr tmp (from);
+
+ if (mpfr_zero_p (from.val))
+ goto finalize_byteorder; /* Result is zero */
+
+ mpfr_set (tmp.val, from.val, MPFR_RNDN);
+
+ if (mpfr_nan_p (tmp.val)) /* Result is NaN */
+ {
+ /* From is NaN */
+ put_field (to, order, fmt->totalsize, fmt->exp_start,
+ fmt->exp_len, fmt->exp_nan);
+ /* Be sure it's not infinity, but NaN value is irrel. */
+ put_field (to, order, fmt->totalsize, fmt->man_start,
+ fmt->man_len, 1);
+ goto finalize_byteorder;
+ }
+
+ /* If negative, set the sign bit. */
+ if (mpfr_sgn (tmp.val) < 0)
+ {
+ put_field (to, order, fmt->totalsize, fmt->sign_start, 1, 1);
+ mpfr_neg (tmp.val, tmp.val, MPFR_RNDN);
+ }
+
+ if (mpfr_inf_p (tmp.val)) /* Result is Infinity. */
+ {
+ /* Infinity exponent is same as NaN's. */
+ put_field (to, order, fmt->totalsize, fmt->exp_start,
+ fmt->exp_len, fmt->exp_nan);
+ /* Infinity mantissa is all zeroes. */
+ put_field (to, order, fmt->totalsize, fmt->man_start,
+ fmt->man_len, 0);
+ goto finalize_byteorder;
+ }
+
+ mpfr_frexp (&exponent, tmp.val, tmp.val, MPFR_RNDN);
+
+ if (exponent + fmt->exp_bias <= 0)
+ {
+ /* The value is too small to be expressed in the destination
+ type (not enough bits in the exponent. Treat as 0. */
+ put_field (to, order, fmt->totalsize, fmt->exp_start,
+ fmt->exp_len, 0);
+ put_field (to, order, fmt->totalsize, fmt->man_start,
+ fmt->man_len, 0);
+ goto finalize_byteorder;
+ }
+
+ if (exponent + fmt->exp_bias >= (1 << fmt->exp_len))
+ {
+ /* The value is too large to fit into the destination.
+ Treat as infinity. */
+ put_field (to, order, fmt->totalsize, fmt->exp_start,
+ fmt->exp_len, fmt->exp_nan);
+ put_field (to, order, fmt->totalsize, fmt->man_start,
+ fmt->man_len, 0);
+ goto finalize_byteorder;
+ }
+
+ put_field (to, order, fmt->totalsize, fmt->exp_start, fmt->exp_len,
+ exponent + fmt->exp_bias - 1);
+
+ mant_bits_left = fmt->man_len;
+ mant_off = fmt->man_start;
+ while (mant_bits_left > 0)
+ {
+ unsigned long mant_long;
+
+ mant_bits = mant_bits_left < 32 ? mant_bits_left : 32;
+
+ mpfr_mul_2ui (tmp.val, tmp.val, 32, MPFR_RNDN);
+ mant_long = mpfr_get_ui (tmp.val, MPFR_RNDZ) & 0xffffffffL;
+ mpfr_sub_ui (tmp.val, tmp.val, mant_long, MPFR_RNDZ);
+
+ /* If the integer bit is implicit, then we need to discard it.
+ If we are discarding a zero, we should be (but are not) creating
+ a denormalized number which means adjusting the exponent
+ (I think). */
+ if (mant_bits_left == fmt->man_len
+ && fmt->intbit == floatformat_intbit_no)
+ {
+ mant_long <<= 1;
+ mant_long &= 0xffffffffL;
+ /* 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)
+ {
+ /* The bits we want are in the most significant MANT_BITS bits of
+ mant_long. Move them to the least significant. */
+ mant_long >>= 32 - mant_bits;
+ }
+
+ put_field (to, order, fmt->totalsize,
+ mant_off, mant_bits, mant_long);
+ mant_off += mant_bits;
+ mant_bits_left -= mant_bits;
+ }
+
+ finalize_byteorder:
+ /* Do we need to byte-swap the words in the result? */
+ if (order != fmt->byteorder)
+ floatformat_normalize_byteorder (fmt, newto, orig_to);
+}
+
+void
+mpfr_float_ops::to_target (const struct type *type,
+ const gdb_mpfr &from, gdb_byte *to) const
+{
+ /* Ensure possible padding bytes in the target buffer are zeroed out. */
+ memset (to, 0, TYPE_LENGTH (type));
+
+ to_target (floatformat_from_type (type), from, to);
+}
+
+/* Convert the byte-stream ADDR, interpreted as floating-point type TYPE,
+ to a string, optionally using the print format FORMAT. */
+std::string
+mpfr_float_ops::to_string (const gdb_byte *addr,
+ const struct type *type,
+ const char *format) const
+{
+ const struct floatformat *fmt = floatformat_from_type (type);
+
+ /* Unless we need to adhere to a specific format, provide special
+ output for certain cases. */
+ if (format == nullptr)
+ {
+ /* Detect invalid representations. */
+ if (!floatformat_is_valid (fmt, addr))
+ return "<invalid float value>";
+
+ /* Handle NaN and Inf. */
+ enum float_kind kind = floatformat_classify (fmt, addr);
+ if (kind == float_nan)
+ {
+ const char *sign = floatformat_is_negative (fmt, addr)? "-" : "";
+ const char *mantissa = floatformat_mantissa (fmt, addr);
+ return string_printf ("%snan(0x%s)", sign, mantissa);
+ }
+ else if (kind == float_infinite)
+ {
+ const char *sign = floatformat_is_negative (fmt, addr)? "-" : "";
+ return string_printf ("%sinf", sign);
+ }
+ }
+
+ /* Determine the format string to use on the host side. */
+ std::string host_format = floatformat_printf_format (fmt, format, 'R');
+
+ gdb_mpfr tmp (type);
+ from_target (type, addr, tmp);
+
+ int size = mpfr_snprintf (NULL, 0, host_format.c_str (), tmp.val);
+ std::string str (size, '\0');
+ mpfr_sprintf (&str[0], host_format.c_str (), tmp.val);
+
+ return str;
+}
+
+/* Parse string STRING into a target floating-number of type TYPE and
+ store it as byte-stream ADDR. Return whether parsing succeeded. */
+bool
+mpfr_float_ops::from_string (gdb_byte *addr,
+ const struct type *type,
+ const std::string &in) const
+{
+ gdb_mpfr tmp (type);
+
+ char *endptr;
+ mpfr_strtofr (tmp.val, in.c_str (), &endptr, 0, MPFR_RNDN);
+
+ /* We only accept the whole string. */
+ if (*endptr)
+ return false;
+
+ to_target (type, tmp, addr);
+ return true;
+}
+
+/* Convert the byte-stream ADDR, interpreted as floating-point type TYPE,
+ to an integer value (rounding towards zero). */
+LONGEST
+mpfr_float_ops::to_longest (const gdb_byte *addr,
+ const struct type *type) const
+{
+ gdb_mpfr tmp (type);
+ from_target (type, addr, tmp);
+ return mpfr_get_sj (tmp.val, MPFR_RNDZ);
+}
+
+/* Convert signed integer VAL to a target floating-number of type TYPE
+ and store it as byte-stream ADDR. */
+void
+mpfr_float_ops::from_longest (gdb_byte *addr,
+ const struct type *type,
+ LONGEST val) const
+{
+ gdb_mpfr tmp (type);
+ mpfr_set_sj (tmp.val, val, MPFR_RNDN);
+ to_target (type, tmp, addr);
+}
+
+/* Convert unsigned integer VAL to a target floating-number of type TYPE
+ and store it as byte-stream ADDR. */
+void
+mpfr_float_ops::from_ulongest (gdb_byte *addr,
+ const struct type *type,
+ ULONGEST val) const
+{
+ gdb_mpfr tmp (type);
+ mpfr_set_uj (tmp.val, val, MPFR_RNDN);
+ to_target (type, tmp, addr);
+}
+
+/* Convert the byte-stream ADDR, interpreted as floating-point type TYPE,
+ to a floating-point value in the host "double" format. */
+double
+mpfr_float_ops::to_host_double (const gdb_byte *addr,
+ const struct type *type) const
+{
+ gdb_mpfr tmp (type);
+ from_target (type, addr, tmp);
+ return mpfr_get_d (tmp.val, MPFR_RNDN);
+}
+
+/* Convert floating-point value VAL in the host "double" format to a target
+ floating-number of type TYPE and store it as byte-stream ADDR. */
+void
+mpfr_float_ops::from_host_double (gdb_byte *addr,
+ const struct type *type,
+ double val) const
+{
+ gdb_mpfr tmp (type);
+ mpfr_set_d (tmp.val, val, MPFR_RNDN);
+ to_target (type, tmp, addr);
+}
+
+/* Convert a floating-point number of type FROM_TYPE from the target
+ byte-stream FROM to a floating-point number of type TO_TYPE, and
+ store it to the target byte-stream TO. */
+void
+mpfr_float_ops::convert (const gdb_byte *from,
+ const struct type *from_type,
+ gdb_byte *to,
+ const struct type *to_type) const
+{
+ gdb_mpfr from_tmp (from_type), to_tmp (to_type);
+ from_target (from_type, from, from_tmp);
+ mpfr_set (to_tmp.val, from_tmp.val, MPFR_RNDN);
+ to_target (to_type, to_tmp, to);
+}
+
+/* Perform the binary operation indicated by OPCODE, using as operands the
+ target byte streams X and Y, interpreted as floating-point numbers of
+ types TYPE_X and TYPE_Y, respectively. Convert the result to type
+ TYPE_RES and store it into the byte-stream RES. */
+void
+mpfr_float_ops::binop (enum exp_opcode op,
+ const gdb_byte *x, const struct type *type_x,
+ const gdb_byte *y, const struct type *type_y,
+ gdb_byte *res, const struct type *type_res) const
+{
+ gdb_mpfr x_tmp (type_x), y_tmp (type_y), tmp (type_res);
+
+ from_target (type_x, x, x_tmp);
+ from_target (type_y, y, y_tmp);
+
+ switch (op)
+ {
+ case BINOP_ADD:
+ mpfr_add (tmp.val, x_tmp.val, y_tmp.val, MPFR_RNDN);
+ break;
+
+ case BINOP_SUB:
+ mpfr_sub (tmp.val, x_tmp.val, y_tmp.val, MPFR_RNDN);
+ break;
+
+ case BINOP_MUL:
+ mpfr_mul (tmp.val, x_tmp.val, y_tmp.val, MPFR_RNDN);
+ break;
+
+ case BINOP_DIV:
+ mpfr_div (tmp.val, x_tmp.val, y_tmp.val, MPFR_RNDN);
+ break;
+
+ case BINOP_EXP:
+ mpfr_pow (tmp.val, x_tmp.val, y_tmp.val, MPFR_RNDN);
+ break;
+
+ case BINOP_MIN:
+ mpfr_min (tmp.val, x_tmp.val, y_tmp.val, MPFR_RNDN);
+ break;
+
+ case BINOP_MAX:
+ mpfr_max (tmp.val, x_tmp.val, y_tmp.val, MPFR_RNDN);
+ break;
+
+ default:
+ error (_("Integer-only operation on floating point number."));
+ break;
+ }
+
+ to_target (type_res, tmp, res);
+}
+
+/* Compare the two target byte streams X and Y, interpreted as floating-point
+ numbers of types TYPE_X and TYPE_Y, respectively. Return zero if X and Y
+ are equal, -1 if X is less than Y, and 1 otherwise. */
+int
+mpfr_float_ops::compare (const gdb_byte *x, const struct type *type_x,
+ const gdb_byte *y, const struct type *type_y) const
+{
+ gdb_mpfr x_tmp (type_x), y_tmp (type_y);
+
+ from_target (type_x, x, x_tmp);
+ from_target (type_y, y, y_tmp);
+
+ if (mpfr_equal_p (x_tmp.val, y_tmp.val))
+ return 0;
+ else if (mpfr_less_p (x_tmp.val, y_tmp.val))
+ return -1;
+ else
+ return 1;
+}
+
+#endif
+
+
+/* Helper routines operating on decimal floating-point data. */
+
+/* Decimal floating point is one of the extension to IEEE 754, which is
+ described in http://grouper.ieee.org/groups/754/revision.html and
+ http://www2.hursley.ibm.com/decimal/. It completes binary floating
+ point by representing floating point more exactly. */
+
+/* The order of the following headers is important for making sure
+ decNumber structure is large enough to hold decimal128 digits. */
+
+#include "dpd/decimal128.h"
+#include "dpd/decimal64.h"
+#include "dpd/decimal32.h"
+
+/* When using decimal128, this is the maximum string length + 1
+ (value comes from libdecnumber's DECIMAL128_String constant). */
+#define MAX_DECIMAL_STRING 43
+
+/* In GDB, we are using an array of gdb_byte to represent decimal values.
+ They are stored in host byte order. This routine does the conversion if
+ the target byte order is different. */
+static void
+match_endianness (const gdb_byte *from, const struct type *type, gdb_byte *to)
+{
+ gdb_assert (TYPE_CODE (type) == TYPE_CODE_DECFLOAT);
+
+ int len = TYPE_LENGTH (type);
+ int i;
+
+#if WORDS_BIGENDIAN
+#define OPPOSITE_BYTE_ORDER BFD_ENDIAN_LITTLE
+#else
+#define OPPOSITE_BYTE_ORDER BFD_ENDIAN_BIG
+#endif
+
+ if (type_byte_order (type) == OPPOSITE_BYTE_ORDER)
+ for (i = 0; i < len; i++)
+ to[i] = from[len - i - 1];
+ else
+ for (i = 0; i < len; i++)
+ to[i] = from[i];
+
+ return;
+}
+
+/* Helper function to get the appropriate libdecnumber context for each size
+ of decimal float. */
+static void
+set_decnumber_context (decContext *ctx, const struct type *type)
+{
+ gdb_assert (TYPE_CODE (type) == TYPE_CODE_DECFLOAT);
+
+ switch (TYPE_LENGTH (type))
+ {
+ case 4:
+ decContextDefault (ctx, DEC_INIT_DECIMAL32);
+ break;
+ case 8:
+ decContextDefault (ctx, DEC_INIT_DECIMAL64);
+ break;
+ case 16:
+ decContextDefault (ctx, DEC_INIT_DECIMAL128);
+ break;
+ }
+
+ ctx->traps = 0;
+}
+
+/* Check for errors signaled in the decimal context structure. */
+static void
+decimal_check_errors (decContext *ctx)
+{
+ /* An error here could be a division by zero, an overflow, an underflow or
+ an invalid operation (from the DEC_Errors constant in decContext.h).
+ Since GDB doesn't complain about division by zero, overflow or underflow
+ errors for binary floating, we won't complain about them for decimal
+ floating either. */
+ if (ctx->status & DEC_IEEE_854_Invalid_operation)
+ {
+ /* Leave only the error bits in the status flags. */
+ ctx->status &= DEC_IEEE_854_Invalid_operation;
+ error (_("Cannot perform operation: %s"),
+ decContextStatusToString (ctx));
+ }
+}
+
+/* Helper function to convert from libdecnumber's appropriate representation
+ for computation to each size of decimal float. */
+static void
+decimal_from_number (const decNumber *from,
+ gdb_byte *to, const struct type *type)
+{
+ gdb_byte dec[16];
+
+ decContext set;
+
+ set_decnumber_context (&set, type);
+
+ switch (TYPE_LENGTH (type))
+ {
+ case 4:
+ decimal32FromNumber ((decimal32 *) dec, from, &set);
break;
case 8:
- decimal64FromNumber ((decimal64 *) to, from, &set);
+ decimal64FromNumber ((decimal64 *) dec, from, &set);
break;
case 16:
- decimal128FromNumber ((decimal128 *) to, from, &set);
+ decimal128FromNumber ((decimal128 *) dec, from, &set);
+ break;
+ default:
+ error (_("Unknown decimal floating point type."));
break;
}
+
+ match_endianness (dec, type, to);
}
/* Helper function to convert each size of decimal float to libdecnumber's
appropriate representation for computation. */
static void
-decimal_to_number (const gdb_byte *from, int len, decNumber *to)
+decimal_to_number (const gdb_byte *addr, const struct type *type,
+ decNumber *to)
{
- switch (len)
+ gdb_byte dec[16];
+ match_endianness (addr, type, dec);
+
+ switch (TYPE_LENGTH (type))
{
case 4:
- decimal32ToNumber ((decimal32 *) from, to);
+ decimal32ToNumber ((decimal32 *) dec, to);
break;
case 8:
- decimal64ToNumber ((decimal64 *) from, to);
+ decimal64ToNumber ((decimal64 *) dec, to);
break;
case 16:
- decimal128ToNumber ((decimal128 *) from, to);
+ decimal128ToNumber ((decimal128 *) dec, to);
break;
default:
error (_("Unknown decimal floating point type."));
}
}
+/* Returns true if ADDR (which is of type TYPE) is the number zero. */
+static bool
+decimal_is_zero (const gdb_byte *addr, const struct type *type)
+{
+ decNumber number;
+
+ decimal_to_number (addr, type, &number);
+
+ return decNumberIsZero (&number);
+}
+
+
+/* Implementation of target_float_ops using the libdecnumber decNumber type
+ as intermediate format. */
+
+class decimal_float_ops : public target_float_ops
+{
+public:
+ std::string to_string (const gdb_byte *addr, const struct type *type,
+ const char *format) const override;
+ bool from_string (gdb_byte *addr, const struct type *type,
+ const std::string &string) const override;
+
+ LONGEST to_longest (const gdb_byte *addr,
+ const struct type *type) const override;
+ void from_longest (gdb_byte *addr, const struct type *type,
+ LONGEST val) const override;
+ void from_ulongest (gdb_byte *addr, const struct type *type,
+ ULONGEST val) const override;
+ double to_host_double (const gdb_byte *addr,
+ const struct type *type) const override
+ {
+ /* We don't support conversions between target decimal floating-point
+ types and the host double type. */
+ gdb_assert_not_reached ("invalid operation on decimal float");
+ }
+ void from_host_double (gdb_byte *addr, const struct type *type,
+ double val) const override
+ {
+ /* We don't support conversions between target decimal floating-point
+ types and the host double type. */
+ gdb_assert_not_reached ("invalid operation on decimal float");
+ }
+ void convert (const gdb_byte *from, const struct type *from_type,
+ gdb_byte *to, const struct type *to_type) const override;
+
+ void binop (enum exp_opcode opcode,
+ const gdb_byte *x, const struct type *type_x,
+ const gdb_byte *y, const struct type *type_y,
+ gdb_byte *res, const struct type *type_res) const override;
+ int compare (const gdb_byte *x, const struct type *type_x,
+ const gdb_byte *y, const struct type *type_y) const override;
+};
+
/* Convert decimal type to its string representation. LEN is the length
of the decimal type, 4 bytes for decimal32, 8 bytes for decimal64 and
16 bytes for decimal128. */
-static std::string
-decimal_to_string (const gdb_byte *decbytes, int len,
- enum bfd_endian byte_order, const char *format = nullptr)
+std::string
+decimal_float_ops::to_string (const gdb_byte *addr, const struct type *type,
+ const char *format = nullptr) const
{
gdb_byte dec[16];
- match_endianness (decbytes, len, byte_order, dec);
+ match_endianness (addr, type, dec);
if (format != nullptr)
{
std::string result;
result.resize (MAX_DECIMAL_STRING);
- switch (len)
+ switch (TYPE_LENGTH (type))
{
case 4:
decimal32ToString ((decimal32 *) dec, &result[0]);
/* Convert the string form of a decimal value to its decimal representation.
LEN is the length of the decimal type, 4 bytes for decimal32, 8 bytes for
decimal64 and 16 bytes for decimal128. */
-static bool
-decimal_from_string (gdb_byte *decbytes, int len, enum bfd_endian byte_order,
- const std::string &string)
+bool
+decimal_float_ops::from_string (gdb_byte *addr, const struct type *type,
+ const std::string &string) const
{
decContext set;
gdb_byte dec[16];
- set_decnumber_context (&set, len);
+ set_decnumber_context (&set, type);
- switch (len)
+ switch (TYPE_LENGTH (type))
{
case 4:
decimal32FromString ((decimal32 *) dec, string.c_str (), &set);
break;
}
- match_endianness (dec, len, byte_order, decbytes);
+ match_endianness (dec, type, addr);
/* Check for errors in the DFP operation. */
decimal_check_errors (&set);
}
/* Converts a LONGEST to a decimal float of specified LEN bytes. */
-static void
-decimal_from_longest (LONGEST from,
- gdb_byte *to, int len, enum bfd_endian byte_order)
+void
+decimal_float_ops::from_longest (gdb_byte *addr, const struct type *type,
+ LONGEST from) const
{
- gdb_byte dec[16];
decNumber number;
+
if ((int32_t) from != from)
/* libdecnumber can convert only 32-bit integers. */
error (_("Conversion of large integer to a "
decNumberFromInt32 (&number, (int32_t) from);
- decimal_from_number (&number, dec, len);
- match_endianness (dec, len, byte_order, to);
+ decimal_from_number (&number, addr, type);
}
/* Converts a ULONGEST to a decimal float of specified LEN bytes. */
-static void
-decimal_from_ulongest (ULONGEST from,
- gdb_byte *to, int len, enum bfd_endian byte_order)
+void
+decimal_float_ops::from_ulongest (gdb_byte *addr, const struct type *type,
+ ULONGEST from) const
{
- gdb_byte dec[16];
decNumber number;
if ((uint32_t) from != from)
decNumberFromUInt32 (&number, (uint32_t) from);
- decimal_from_number (&number, dec, len);
- match_endianness (dec, len, byte_order, to);
+ decimal_from_number (&number, addr, type);
}
/* Converts a decimal float of LEN bytes to a LONGEST. */
-static LONGEST
-decimal_to_longest (const gdb_byte *from, int len, enum bfd_endian byte_order)
+LONGEST
+decimal_float_ops::to_longest (const gdb_byte *addr,
+ const struct type *type) const
{
/* libdecnumber has a function to convert from decimal to integer, but
it doesn't work when the decimal number has a fractional part. */
- std::string str = decimal_to_string (from, len, byte_order);
+ std::string str = to_string (addr, type);
return strtoll (str.c_str (), NULL, 10);
}
/* Perform operation OP with operands X and Y with sizes LEN_X and LEN_Y
and byte orders BYTE_ORDER_X and BYTE_ORDER_Y, and store value in
RESULT with size LEN_RESULT and byte order BYTE_ORDER_RESULT. */
-static void
-decimal_binop (enum exp_opcode op,
- const gdb_byte *x, int len_x, enum bfd_endian byte_order_x,
- const gdb_byte *y, int len_y, enum bfd_endian byte_order_y,
- gdb_byte *result, int len_result,
- enum bfd_endian byte_order_result)
+void
+decimal_float_ops::binop (enum exp_opcode op,
+ const gdb_byte *x, const struct type *type_x,
+ const gdb_byte *y, const struct type *type_y,
+ gdb_byte *res, const struct type *type_res) const
{
decContext set;
decNumber number1, number2, number3;
- gdb_byte dec1[16], dec2[16], dec3[16];
-
- match_endianness (x, len_x, byte_order_x, dec1);
- match_endianness (y, len_y, byte_order_y, dec2);
- decimal_to_number (dec1, len_x, &number1);
- decimal_to_number (dec2, len_y, &number2);
+ decimal_to_number (x, type_x, &number1);
+ decimal_to_number (y, type_y, &number2);
- set_decnumber_context (&set, len_result);
+ set_decnumber_context (&set, type_res);
switch (op)
{
/* Check for errors in the DFP operation. */
decimal_check_errors (&set);
- decimal_from_number (&number3, dec3, len_result);
-
- match_endianness (dec3, len_result, byte_order_result, result);
-}
-
-/* Returns true if X (which is LEN bytes wide) is the number zero. */
-static int
-decimal_is_zero (const gdb_byte *x, int len, enum bfd_endian byte_order)
-{
- decNumber number;
- gdb_byte dec[16];
-
- match_endianness (x, len, byte_order, dec);
- decimal_to_number (dec, len, &number);
-
- return decNumberIsZero (&number);
+ decimal_from_number (&number3, res, type_res);
}
/* Compares two numbers numerically. If X is less than Y then the return value
will be -1. If they are equal, then the return value will be 0. If X is
greater than the Y then the return value will be 1. */
-static int
-decimal_compare (const gdb_byte *x, int len_x, enum bfd_endian byte_order_x,
- const gdb_byte *y, int len_y, enum bfd_endian byte_order_y)
+int
+decimal_float_ops::compare (const gdb_byte *x, const struct type *type_x,
+ const gdb_byte *y, const struct type *type_y) const
{
decNumber number1, number2, result;
decContext set;
- gdb_byte dec1[16], dec2[16];
- int len_result;
+ const struct type *type_result;
- match_endianness (x, len_x, byte_order_x, dec1);
- match_endianness (y, len_y, byte_order_y, dec2);
-
- decimal_to_number (dec1, len_x, &number1);
- decimal_to_number (dec2, len_y, &number2);
+ decimal_to_number (x, type_x, &number1);
+ decimal_to_number (y, type_y, &number2);
/* Perform the comparison in the larger of the two sizes. */
- len_result = len_x > len_y ? len_x : len_y;
- set_decnumber_context (&set, len_result);
+ type_result = TYPE_LENGTH (type_x) > TYPE_LENGTH (type_y) ? type_x : type_y;
+ set_decnumber_context (&set, type_result);
decNumberCompare (&result, &number1, &number2, &set);
/* Convert a decimal value from a decimal type with LEN_FROM bytes to a
decimal type with LEN_TO bytes. */
-static void
-decimal_convert (const gdb_byte *from, int len_from,
- enum bfd_endian byte_order_from, gdb_byte *to, int len_to,
- enum bfd_endian byte_order_to)
+void
+decimal_float_ops::convert (const gdb_byte *from, const struct type *from_type,
+ gdb_byte *to, const struct type *to_type) const
{
decNumber number;
- gdb_byte dec[16];
-
- match_endianness (from, len_from, byte_order_from, dec);
-
- decimal_to_number (dec, len_from, &number);
- decimal_from_number (&number, dec, len_to);
- match_endianness (dec, len_to, byte_order_to, to);
+ decimal_to_number (from, from_type, &number);
+ decimal_from_number (&number, to, to_type);
}
"struct type", which may be either a binary or decimal floating-point
type (TYPE_CODE_FLT or TYPE_CODE_DECFLOAT). */
+/* Return whether TYPE1 and TYPE2 are of the same category (binary or
+ decimal floating-point). */
+static bool
+target_float_same_category_p (const struct type *type1,
+ const struct type *type2)
+{
+ return TYPE_CODE (type1) == TYPE_CODE (type2);
+}
+
+/* Return whether TYPE1 and TYPE2 use the same floating-point format. */
+static bool
+target_float_same_format_p (const struct type *type1,
+ const struct type *type2)
+{
+ if (!target_float_same_category_p (type1, type2))
+ return false;
+
+ switch (TYPE_CODE (type1))
+ {
+ case TYPE_CODE_FLT:
+ return floatformat_from_type (type1) == floatformat_from_type (type2);
+
+ case TYPE_CODE_DECFLOAT:
+ return (TYPE_LENGTH (type1) == TYPE_LENGTH (type2)
+ && (type_byte_order (type1)
+ == type_byte_order (type2)));
+
+ default:
+ gdb_assert_not_reached ("unexpected type code");
+ }
+}
+
+/* Return the size (without padding) of the target floating-point
+ format used by TYPE. */
+static int
+target_float_format_length (const struct type *type)
+{
+ switch (TYPE_CODE (type))
+ {
+ case TYPE_CODE_FLT:
+ return floatformat_totalsize_bytes (floatformat_from_type (type));
+
+ case TYPE_CODE_DECFLOAT:
+ return TYPE_LENGTH (type);
+
+ default:
+ gdb_assert_not_reached ("unexpected type code");
+ }
+}
+
+/* Identifiers of available host-side intermediate formats. These must
+ be sorted so the that the more "general" kinds come later. */
+enum target_float_ops_kind
+{
+ /* Target binary floating-point formats that match a host format. */
+ host_float = 0,
+ host_double,
+ host_long_double,
+ /* Any other target binary floating-point format. */
+ binary,
+ /* Any target decimal floating-point format. */
+ decimal
+};
+
+/* Given a target type TYPE, choose the best host-side intermediate format
+ to perform operations on TYPE in. */
+static enum target_float_ops_kind
+get_target_float_ops_kind (const struct type *type)
+{
+ switch (TYPE_CODE (type))
+ {
+ case TYPE_CODE_FLT:
+ {
+ const struct floatformat *fmt = floatformat_from_type (type);
+
+ /* Binary floating-point formats matching a host format. */
+ if (fmt == host_float_format)
+ return target_float_ops_kind::host_float;
+ if (fmt == host_double_format)
+ return target_float_ops_kind::host_double;
+ if (fmt == host_long_double_format)
+ return target_float_ops_kind::host_long_double;
+
+ /* Any other binary floating-point format. */
+ return target_float_ops_kind::binary;
+ }
+
+ case TYPE_CODE_DECFLOAT:
+ {
+ /* Any decimal floating-point format. */
+ return target_float_ops_kind::decimal;
+ }
+
+ default:
+ gdb_assert_not_reached ("unexpected type code");
+ }
+}
+
+/* Return target_float_ops to peform operations for KIND. */
+static const target_float_ops *
+get_target_float_ops (enum target_float_ops_kind kind)
+{
+ switch (kind)
+ {
+ /* If the type format matches one of the host floating-point
+ types, use that type as intermediate format. */
+ case target_float_ops_kind::host_float:
+ {
+ static host_float_ops<float> host_float_ops_float;
+ return &host_float_ops_float;
+ }
+
+ case target_float_ops_kind::host_double:
+ {
+ static host_float_ops<double> host_float_ops_double;
+ return &host_float_ops_double;
+ }
+
+ case target_float_ops_kind::host_long_double:
+ {
+ static host_float_ops<long double> host_float_ops_long_double;
+ return &host_float_ops_long_double;
+ }
+
+ /* For binary floating-point formats that do not match any host format,
+ use mpfr_t as intermediate format to provide precise target-floating
+ point emulation. However, if the MPFR library is not available,
+ use the largest host floating-point type as intermediate format. */
+ case target_float_ops_kind::binary:
+ {
+#ifdef HAVE_LIBMPFR
+ static mpfr_float_ops binary_float_ops;
+#else
+ static host_float_ops<long double> binary_float_ops;
+#endif
+ return &binary_float_ops;
+ }
+
+ /* For decimal floating-point types, always use the libdecnumber
+ decNumber type as intermediate format. */
+ case target_float_ops_kind::decimal:
+ {
+ static decimal_float_ops decimal_float_ops;
+ return &decimal_float_ops;
+ }
+
+ default:
+ gdb_assert_not_reached ("unexpected target_float_ops_kind");
+ }
+}
+
+/* Given a target type TYPE, determine the best host-side intermediate format
+ to perform operations on TYPE in. */
+static const target_float_ops *
+get_target_float_ops (const struct type *type)
+{
+ enum target_float_ops_kind kind = get_target_float_ops_kind (type);
+ return get_target_float_ops (kind);
+}
+
+/* The same for operations involving two target types TYPE1 and TYPE2. */
+static const target_float_ops *
+get_target_float_ops (const struct type *type1, const struct type *type2)
+{
+ gdb_assert (TYPE_CODE (type1) == TYPE_CODE (type2));
+
+ enum target_float_ops_kind kind1 = get_target_float_ops_kind (type1);
+ enum target_float_ops_kind kind2 = get_target_float_ops_kind (type2);
+
+ /* Given the way the kinds are sorted, we simply choose the larger one;
+ this will be able to hold values of either type. */
+ return get_target_float_ops (std::max (kind1, kind2));
+}
+
/* Return whether the byte-stream ADDR holds a valid value of
floating-point type TYPE. */
bool
== float_zero);
if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
- return decimal_is_zero (addr, TYPE_LENGTH (type),
- gdbarch_byte_order (get_type_arch (type)));
+ return decimal_is_zero (addr, type);
gdb_assert_not_reached ("unexpected type code");
}
target_float_to_string (const gdb_byte *addr, const struct type *type,
const char *format)
{
- if (TYPE_CODE (type) == TYPE_CODE_FLT)
- return floatformat_to_string (floatformat_from_type (type), addr, format);
+ /* Unless we need to adhere to a specific format, provide special
+ output for special cases of binary floating-point numbers. */
+ if (format == nullptr && TYPE_CODE (type) == TYPE_CODE_FLT)
+ {
+ const struct floatformat *fmt = floatformat_from_type (type);
- if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
- return decimal_to_string (addr, TYPE_LENGTH (type),
- gdbarch_byte_order (get_type_arch (type)),
- format);
+ /* Detect invalid representations. */
+ if (!floatformat_is_valid (fmt, addr))
+ return "<invalid float value>";
- gdb_assert_not_reached ("unexpected type code");
+ /* Handle NaN and Inf. */
+ enum float_kind kind = floatformat_classify (fmt, addr);
+ if (kind == float_nan)
+ {
+ const char *sign = floatformat_is_negative (fmt, addr)? "-" : "";
+ const char *mantissa = floatformat_mantissa (fmt, addr);
+ return string_printf ("%snan(0x%s)", sign, mantissa);
+ }
+ else if (kind == float_infinite)
+ {
+ const char *sign = floatformat_is_negative (fmt, addr)? "-" : "";
+ return string_printf ("%sinf", sign);
+ }
+ }
+
+ const target_float_ops *ops = get_target_float_ops (type);
+ return ops->to_string (addr, type, format);
}
/* Parse string STRING into a target floating-number of type TYPE and
target_float_from_string (gdb_byte *addr, const struct type *type,
const std::string &string)
{
- /* Ensure possible padding bytes in the target buffer are zeroed out. */
- memset (addr, 0, TYPE_LENGTH (type));
-
- if (TYPE_CODE (type) == TYPE_CODE_FLT)
- return floatformat_from_string (floatformat_from_type (type), addr,
- string);
-
- if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
- return decimal_from_string (addr, TYPE_LENGTH (type),
- gdbarch_byte_order (get_type_arch (type)),
- string);
-
- gdb_assert_not_reached ("unexpected type code");
+ const target_float_ops *ops = get_target_float_ops (type);
+ return ops->from_string (addr, type, string);
}
/* Convert the byte-stream ADDR, interpreted as floating-point type TYPE,
LONGEST
target_float_to_longest (const gdb_byte *addr, const struct type *type)
{
- if (TYPE_CODE (type) == TYPE_CODE_FLT)
- return floatformat_to_longest (floatformat_from_type (type), addr);
-
- if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
- return decimal_to_longest (addr, TYPE_LENGTH (type),
- gdbarch_byte_order (get_type_arch (type)));
-
- gdb_assert_not_reached ("unexpected type code");
+ const target_float_ops *ops = get_target_float_ops (type);
+ return ops->to_longest (addr, type);
}
/* Convert signed integer VAL to a target floating-number of type TYPE
target_float_from_longest (gdb_byte *addr, const struct type *type,
LONGEST val)
{
- /* Ensure possible padding bytes in the target buffer are zeroed out. */
- memset (addr, 0, TYPE_LENGTH (type));
-
- if (TYPE_CODE (type) == TYPE_CODE_FLT)
- {
- floatformat_from_longest (floatformat_from_type (type), addr, val);
- return;
- }
-
- if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
- {
- decimal_from_longest (val, addr, TYPE_LENGTH (type),
- gdbarch_byte_order (get_type_arch (type)));
- return;
- }
-
- gdb_assert_not_reached ("unexpected type code");
+ const target_float_ops *ops = get_target_float_ops (type);
+ ops->from_longest (addr, type, val);
}
/* Convert unsigned integer VAL to a target floating-number of type TYPE
target_float_from_ulongest (gdb_byte *addr, const struct type *type,
ULONGEST val)
{
- /* Ensure possible padding bytes in the target buffer are zeroed out. */
- memset (addr, 0, TYPE_LENGTH (type));
-
- if (TYPE_CODE (type) == TYPE_CODE_FLT)
- {
- floatformat_from_ulongest (floatformat_from_type (type), addr, val);
- return;
- }
-
- if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
- {
- decimal_from_ulongest (val, addr, TYPE_LENGTH (type),
- gdbarch_byte_order (get_type_arch (type)));
- return;
- }
-
- gdb_assert_not_reached ("unexpected type code");
+ const target_float_ops *ops = get_target_float_ops (type);
+ ops->from_ulongest (addr, type, val);
}
/* Convert the byte-stream ADDR, interpreted as floating-point type TYPE,
target_float_to_host_double (const gdb_byte *addr,
const struct type *type)
{
- if (TYPE_CODE (type) == TYPE_CODE_FLT)
- return floatformat_to_host_double (floatformat_from_type (type), addr);
-
- /* We don't support conversions between target decimal floating-point
- types and the host double type here. */
-
- gdb_assert_not_reached ("unexpected type code");
+ const target_float_ops *ops = get_target_float_ops (type);
+ return ops->to_host_double (addr, type);
}
/* Convert floating-point value VAL in the host "double" format to a target
target_float_from_host_double (gdb_byte *addr, const struct type *type,
double val)
{
- /* Ensure possible padding bytes in the target buffer are zeroed out. */
- memset (addr, 0, TYPE_LENGTH (type));
-
- if (TYPE_CODE (type) == TYPE_CODE_FLT)
- {
- floatformat_from_host_double (floatformat_from_type (type), addr, val);
- return;
- }
-
- /* We don't support conversions between target decimal floating-point
- types and the host double type here. */
-
- gdb_assert_not_reached ("unexpected type code");
+ const target_float_ops *ops = get_target_float_ops (type);
+ ops->from_host_double (addr, type, val);
}
/* Convert a floating-point number of type FROM_TYPE from the target
target_float_convert (const gdb_byte *from, const struct type *from_type,
gdb_byte *to, const struct type *to_type)
{
- /* Ensure possible padding bytes in the target buffer are zeroed out. */
- memset (to, 0, TYPE_LENGTH (to_type));
-
- /* Use direct conversion routines if we have them. */
-
- if (TYPE_CODE (from_type) == TYPE_CODE_FLT
- && TYPE_CODE (to_type) == TYPE_CODE_FLT)
- {
- floatformat_convert (from, floatformat_from_type (from_type),
- to, floatformat_from_type (to_type));
- return;
- }
-
- if (TYPE_CODE (from_type) == TYPE_CODE_DECFLOAT
- && TYPE_CODE (to_type) == TYPE_CODE_DECFLOAT)
- {
- decimal_convert (from, TYPE_LENGTH (from_type),
- gdbarch_byte_order (get_type_arch (from_type)),
- to, TYPE_LENGTH (to_type),
- gdbarch_byte_order (get_type_arch (to_type)));
- return;
- }
-
/* We cannot directly convert between binary and decimal floating-point
types, so go via an intermediary string. */
-
- if ((TYPE_CODE (from_type) == TYPE_CODE_FLT
- && TYPE_CODE (to_type) == TYPE_CODE_DECFLOAT)
- || (TYPE_CODE (from_type) == TYPE_CODE_DECFLOAT
- && TYPE_CODE (to_type) == TYPE_CODE_FLT))
+ if (!target_float_same_category_p (from_type, to_type))
{
std::string str = target_float_to_string (from, from_type);
target_float_from_string (to, to_type, str);
return;
}
- gdb_assert_not_reached ("unexpected type code");
+ /* Convert between two different formats in the same category. */
+ if (!target_float_same_format_p (from_type, to_type))
+ {
+ const target_float_ops *ops = get_target_float_ops (from_type, to_type);
+ ops->convert (from, from_type, to, to_type);
+ return;
+ }
+
+ /* The floating-point formats match, so we simply copy the data, ensuring
+ possible padding bytes in the target buffer are zeroed out. */
+ memset (to, 0, TYPE_LENGTH (to_type));
+ memcpy (to, from, target_float_format_length (to_type));
}
/* Perform the binary operation indicated by OPCODE, using as operands the
const gdb_byte *y, const struct type *type_y,
gdb_byte *res, const struct type *type_res)
{
- /* Ensure possible padding bytes in the target buffer are zeroed out. */
- memset (res, 0, TYPE_LENGTH (type_res));
-
- if (TYPE_CODE (type_res) == TYPE_CODE_FLT)
- {
- gdb_assert (TYPE_CODE (type_x) == TYPE_CODE_FLT);
- gdb_assert (TYPE_CODE (type_y) == TYPE_CODE_FLT);
- return floatformat_binop (opcode,
- floatformat_from_type (type_x), x,
- floatformat_from_type (type_y), y,
- floatformat_from_type (type_res), res);
- }
-
- if (TYPE_CODE (type_res) == TYPE_CODE_DECFLOAT)
- {
- gdb_assert (TYPE_CODE (type_x) == TYPE_CODE_DECFLOAT);
- gdb_assert (TYPE_CODE (type_y) == TYPE_CODE_DECFLOAT);
- return decimal_binop (opcode,
- x, TYPE_LENGTH (type_x),
- gdbarch_byte_order (get_type_arch (type_x)),
- y, TYPE_LENGTH (type_y),
- gdbarch_byte_order (get_type_arch (type_y)),
- res, TYPE_LENGTH (type_res),
- gdbarch_byte_order (get_type_arch (type_res)));
- }
+ gdb_assert (target_float_same_category_p (type_x, type_res));
+ gdb_assert (target_float_same_category_p (type_y, type_res));
- gdb_assert_not_reached ("unexpected type code");
+ const target_float_ops *ops = get_target_float_ops (type_x, type_y);
+ ops->binop (opcode, x, type_x, y, type_y, res, type_res);
}
/* Compare the two target byte streams X and Y, interpreted as floating-point
target_float_compare (const gdb_byte *x, const struct type *type_x,
const gdb_byte *y, const struct type *type_y)
{
- if (TYPE_CODE (type_x) == TYPE_CODE_FLT)
- {
- gdb_assert (TYPE_CODE (type_y) == TYPE_CODE_FLT);
- return floatformat_compare (floatformat_from_type (type_x), x,
- floatformat_from_type (type_y), y);
- }
+ gdb_assert (target_float_same_category_p (type_x, type_y));
- if (TYPE_CODE (type_x) == TYPE_CODE_DECFLOAT)
- {
- gdb_assert (TYPE_CODE (type_y) == TYPE_CODE_DECFLOAT);
- return decimal_compare (x, TYPE_LENGTH (type_x),
- gdbarch_byte_order (get_type_arch (type_x)),
- y, TYPE_LENGTH (type_y),
- gdbarch_byte_order (get_type_arch (type_y)));
- }
-
- gdb_assert_not_reached ("unexpected type code");
+ const target_float_ops *ops = get_target_float_ops (type_x, type_y);
+ return ops->compare (x, type_x, y, type_y);
}
projects / deliverable / binutils-gdb.git / blobdiff