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Joel Brobecker f5a9147212 preserve type length in ada-lang.c::to_fixed_range_type
This patch fixes a potential issue which was noticed by code inspection:
ada-lang.c::to_fixed_range_type uses gdbtypes.c::create_static_range_type
to create most of the range type, which relies on create_range_type to
do most of the work. The latter has the following piece of code which
sets the length of the range type to match the length of the index_type:

    if (TYPE_STUB (index_type))
      TYPE_TARGET_STUB (result_type) = 1;
    else
      TYPE_LENGTH (result_type) = TYPE_LENGTH (check_typedef (index_type));

In Ada, it is actually possible to have a range type whose size
is smaller than its base type. For instance, with:

    type Unsigned2_T is  range 0 .. 2 ** 16 - 1;
    for Unsigned2_T'SIZE use 16;

The compiler generates the following DWARF:

        .uleb128 0x3    # (DIE (0x4e) DW_TAG_subrange_type)
        .byte   0x2     # DW_AT_byte_size
        .byte   0       # DW_AT_lower_bound
        .value  0xffff  # DW_AT_upper_bound
        .long   .LASF64 # DW_AT_name: "try__unsigned2_t___XDLU_0__65535"
        .long   0x616   # DW_AT_type

... which points to the following base type...

        .uleb128 0x1d   # (DIE (0x616) DW_TAG_base_type)
        .byte   0x4     # DW_AT_byte_size
        .byte   0x5     # DW_AT_encoding
        .long   .LASF57 # DW_AT_name: "try__Tunsigned2_tB"
                        # DW_AT_artificial

... which has a size of 4 bytes.

With a type like this one, create_range_type returns a type whose
size is 4 bytes, instead of 2, which is not what we we would normally
expect.

Currently, this function is only used to handle array index types,
so the length of the type actually does not matter and there should
not be any user-visible consequences of the current behavior. But
it seems best to plug this latent bug now, rather than wait for it
to surface....

gdb/ChangeLog:

        * ada-lang.c (to_fixed_range_type): Make sure that the size
        of the range type being returned is the same as the size
        of the range type being fixed.

Tested on x86_64-linux, no regression.
2017-11-29 18:32:17 -05:00
bfd Check for a NULL symbol pointer when reading relocs from a COFF based file. 2017-11-29 17:12:12 +00:00
binutils Stop objdump from attempting to allocate a huge chunk of memory when parsing relocs in a corrupt file. 2017-11-29 12:40:43 +00:00
config
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gas Give Palmer co-credit for last patch. 2017-11-29 10:51:36 -08:00
gdb preserve type length in ada-lang.c::to_fixed_range_type 2017-11-29 18:32:17 -05:00
gold Support --localedir, --datarootdir and --datadir 2017-11-29 20:10:52 +10:30
gprof Support --localedir, --datarootdir and --datadir 2017-11-29 20:10:52 +10:30
include Re-apply "elf: Properly compute offsets of note descriptor and next note" 2017-11-24 14:52:15 -08:00
intl
ld ld: Add a testcase for PR ld/22471 2017-11-29 04:21:01 -08:00
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opcodes Support --localedir, --datarootdir and --datadir 2017-11-29 20:10:52 +10:30
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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.