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Ulrich Weigand 50eff16b85 Target FP: Perform Ada fixed-point scaling in target format
One of the few still remaining uses of DOUBLEST in GDB is the Ada front-end
code that handles scaling of Ada fixed-point types.  The target format for
those types is some integer format; to convert those values to standard
floating-point representation, that integer needs to be multiplied by a
rational scale factor, given as a pair of numerator and denominator.

To avoid having to deal with long integer arithmetic, the current Ada
front-end code currently performs those scaling operations in host
DOUBLEST arithmetic.  To eliminate this use of DOUBLEST, this patch
changes the front-end to instead perform those operations in the
*target* floating-point format (chosing to use the target "long double").

The implementation is mostly straight-forward, using value_cast and
value_binop to perform the target operations.

Scanning in the scale numerator and denominator is now done into
a host "long long" instead of a DOUBLEST, which should be large
enough to hold all possible values.  (Otherwise, this can be replaced
by target-format target_float_from_string operations as well.)

Printing fixed-point types and values should be completely unchanges,
using target_float_to_string with the same format strings as current code.

gdb/ChangeLog:
2017-11-06  Ulrich Weigand  <uweigand@de.ibm.com>

	* ada-lang.c (cast_to_fixed): Reimplement in target arithmetic.
	(cast_from_fixed): Likewise.
	(ada_scaling_type): New function.
	(ada_delta): Return value instead of DOUBLEST.  Perform target
	arithmetic instead of host arithmetic.
	(scaling_factor): Rename to ...
	(ada_scaling_factor) ... this.  Make non-static.  Return value instead
	of DOUBLEST.  Perform target arithmetic instead of host arithmetic.
	(ada_fixed_to_float): Remove.
	(ada_float_to_fixed): Remove.
	* ada-lang.h (ada_fixed_to_float): Remove.
	(ada_float_to_fixed): Remove.
	(ada_delta): Return value instead of DOUBLEST.
	(ada_scaling_factor): Add prototype.

	* ada-typeprint.c: Include "target-float.h".
	(print_fixed_point_type): Perform target arithmetic instead of
	host arithmetic.
	* ada-valprint.c: Include "target-float.h".
	(ada_val_print_num): Perform target arithmetic instead of
	host arithmetic for fixed-point types.
2017-11-06 16:00:12 +01:00
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		   README for GNU development tools

This directory contains various GNU compilers, assemblers, linkers, 
debuggers, etc., plus their support routines, definitions, and documentation.

If you are receiving this as part of a GDB release, see the file gdb/README.
If with a binutils release, see binutils/README;  if with a libg++ release,
see libg++/README, etc.  That'll give you info about this
package -- supported targets, how to use it, how to report bugs, etc.

It is now possible to automatically configure and build a variety of
tools with one command.  To build all of the tools contained herein,
run the ``configure'' script here, e.g.:

	./configure 
	make

To install them (by default in /usr/local/bin, /usr/local/lib, etc),
then do:
	make install

(If the configure script can't determine your type of computer, give it
the name as an argument, for instance ``./configure sun4''.  You can
use the script ``config.sub'' to test whether a name is recognized; if
it is, config.sub translates it to a triplet specifying CPU, vendor,
and OS.)

If you have more than one compiler on your system, it is often best to
explicitly set CC in the environment before running configure, and to
also set CC when running make.  For example (assuming sh/bash/ksh):

	CC=gcc ./configure
	make

A similar example using csh:

	setenv CC gcc
	./configure
	make

Much of the code and documentation enclosed is copyright by
the Free Software Foundation, Inc.  See the file COPYING or
COPYING.LIB in the various directories, for a description of the
GNU General Public License terms under which you can copy the files.

REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info
on where and how to report problems.