16e812b29e
This patch adds support for handling format strings to both floatformat_to_string and decimal_to_string, and then uses those routines to implement ui_printf formatted printing. There is already a subroutine printf_decfloat that ui_printf uses to handle decimal FP. This is renamed to printf_floating and updated to handle both binary and decimal FP. This includes the following set of changes: - printf_decfloat currently parses the format string again to determine the intended target format. This seems superfluous since the common parsing code in parse_format_string already did this, but then did not pass the result on to its users. Fixed by splitting the decfloat_arg argument class into three distinct classes, and passing them through. - Now we can rename printf_decfloat to printf_floating and also call it for the argument classes representing binary FP types. - The code will now use the argclass to detect the type the value should be printed at, and converts the input value to this type if necessary. To remain compatible with current behavior, for binary FP the code instead tries to re-interpret the input value as a FP type of the same size if that exists. (Maybe this behavior is more confusing than useful -- but this can be changed later if we want to ...) - Finally, we can use floatformat_to_string / decimal_to_string passing the format string to perform the formatted output using the desired target FP type. Note that we no longer generate different code depending on whether or not the host supports "long double" -- this check is obsolete anyway since C++11 mandates "long double", and in any case a %lg format string is intended to refer to the *target* long double type, not the host version. Note also that formatted printing of DFP numbers may not work correctly, since it attempts to use the host printf to do so (and makes unwarranted assumptions about the host ABI while doing so!). This is no change to the current behavior -- I simply moved the code from printf_decfloat to the decimal_to_string routine in dfp.c. If we want to fix it in the future, that is a more appropriate place anyway. ChangeLog: 2017-10-24 Ulrich Weigand <uweigand@de.ibm.com> * common/format.h (enum argclass): Replace decfloat_arg by dec32float_arg, dec64float_arg, and dec128float_arg. * common/format.c (parse_format_string): Update to return new decimal float argument classes. * printcmd.c (printf_decfloat): Rename to ... (printf_floating): ... this. Add argclass argument, and use it instead of parsing the format string again. Add support for binary floating-point values, using floatformat_to_string. Convert value to the target format if it doesn't already match. (ui_printf): Call printf_floating instead of printf_decfloat, also for double_arg / long_double_arg. Pass argclass. * dfp.c (decimal_to_string): Add format string argument. * dfp.h (decimal_to_string): Likewise. * doublest.c (floatformat_to_string): Add format string argument. * doublest.h (floatformat_to_string): Likewise. |
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README
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.