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Simon Marchi 4bce7cdaf4 gdbsupport: add array_view copy function
An assertion was recently added to array_view::operator[] to ensure we
don't do out of bounds accesses.  However, when the array_view is copied
to or from using memcpy, it bypasses that safety.

To address this, add a `copy` free function that copies data from an
array view to another, ensuring that the destination and source array
views have the same size.  When copying to or from parts of an
array_view, we are expected to use gdb::array_view::slice, which does
its own bounds check.  With all that, any copy operation that goes out
of bounds should be caught by an assertion at runtime.

copy is implemented using std::copy and std::copy_backward, which, at
least on libstdc++, appears to pick memmove when copying trivial data.
So in the end there shouldn't be much difference vs using a bare memcpy,
as we do right now.  When copying non-trivial data, std::copy and
std::copy_backward assigns each element in a loop.

To properly support overlapping ranges, we must use std::copy or
std::copy_backward, depending on whether the destination is before the
source or vice-versa.  std::copy and std::copy_backward don't support
copying exactly overlapping ranges (where the source range is equal to
the destination range).  But in this case, no copy is needed anyway, so
we do nothing.

The order of parameters of the new copy function is based on std::copy
and std::copy_backward, where the source comes before the destination.

Change a few randomly selected spots to use the new function, to show
how it can be used.

Add a test for the new function, testing both with arrays of a trivial
type (int) and of a non-trivial type (foo).  Test non-overlapping
ranges as well as three kinds of overlapping ranges: source before dest,
dest before source, and dest == source.

Change-Id: Ibeaca04e0028410fd44ce82f72e60058d6230a03
2021-12-03 16:37:36 -05:00
bfd Automatic date update in version.in 2021-12-03 00:00:15 +00:00
binutils Add myself and Zhensong Liu as the LoongArch port maintainer. 2021-12-03 10:15:44 +08:00
config Deprecate a.out support for NetBSD targets. 2021-08-11 13:17:54 +01:00
contrib Import mklog.py from gcc repo 2020-09-25 10:24:44 -04:00
cpu Re: opcodes: constify & local meps macros 2021-07-05 21:40:49 +09:30
elfcpp arm: add armv9-a architecture to -march 2021-11-01 10:51:03 +00:00
etc etc: switch to automake 2021-09-09 23:30:12 -04:00
gas aarch64: Update gas/NEWS for recent changes 2021-12-02 15:00:57 +00:00
gdb gdbsupport: add array_view copy function 2021-12-03 16:37:36 -05:00
gdbserver [gdb/tdep] Fix avx512 -m32 support in gdbserver 2021-12-02 18:20:13 +01:00
gdbsupport gdbsupport: add array_view copy function 2021-12-03 16:37:36 -05:00
gnulib gnulib: import various network functions 2021-09-08 17:48:09 -04:00
gold gold: enable silent build rules 2021-11-30 19:41:31 -05:00
gprof gprof: enable silent build rules 2021-11-29 20:28:29 -05:00
include aarch64: Add BC instruction 2021-12-02 15:00:57 +00:00
intl Regenerate a couple of files 2021-11-15 12:20:12 +10:30
ld x86: Skip __[start|stop]_SECNAME for --gc-sections -z start-stop-gc 2021-12-02 03:55:10 -08:00
libbacktrace sync libbacktrace from gcc 2021-11-14 18:07:50 +10:30
libctf libctf: workaround automake bug with conditional info pages 2021-12-02 23:26:18 -05:00
libdecnumber Run autoreconf -vf throughout 2020-07-29 16:03:55 -04:00
libiberty Deprecate a.out support for NetBSD targets. 2021-08-11 13:17:54 +01:00
opcodes aarch64: Fix uninitialised memory 2021-12-03 11:57:17 +00:00
readline Update config.sub and config.guess for MIPS R3 and R5 ISA support 2021-05-24 18:11:49 +02:00
sim sim: testsuite: drop most specific istarget checks 2021-11-28 21:55:16 -05:00
texinfo
zlib zlib: enable silent build rules 2021-11-29 20:28:29 -05:00
.cvsignore
.gitattributes
.gitignore Add gnu global outputs to .gitignore 2020-12-02 10:00:27 -05:00
ar-lib Bump to autoconf 2.69 and automake 1.15.1 2018-06-19 16:55:06 -04:00
ChangeLog Document "memory-tag-violations". 2021-10-29 13:31:37 +03:00
compile
config-ml.in
config.guess Update config.sub and config.guess for MIPS R3 and R5 ISA support 2021-05-24 18:11:49 +02:00
config.rpath
config.sub Update config.sub and config.guess for MIPS R3 and R5 ISA support 2021-05-24 18:11:49 +02:00
configure top-level configure: setup target_configdirs based on repository 2021-09-28 12:21:21 +01:00
configure.ac top-level configure: setup target_configdirs based on repository 2021-09-28 12:21:21 +01:00
COPYING
COPYING3
COPYING3.LIB
COPYING.LIB
COPYING.LIBGLOSS
COPYING.NEWLIB
depcomp
djunpack.bat
install-sh
libtool.m4 libtool.m4: fix nm BSD flag detection 2021-09-27 20:31:23 +01:00
lt~obsolete.m4
ltgcc.m4
ltmain.sh
ltoptions.m4
ltsugar.m4
ltversion.m4
MAINTAINERS MAINTAINERS: Update path to readline config.{sub,guess} files 2021-05-24 18:11:49 +02:00
Makefile.def Import Makefile.def from gcc 2021-11-12 19:02:12 +10:30
Makefile.in Sync Makefile.tpl with GCC 2021-11-13 09:04:03 -08:00
Makefile.tpl Sync Makefile.tpl with GCC 2021-11-13 09:04:03 -08:00
makefile.vms
missing
mkdep
mkinstalldirs
move-if-change
multilib.am Merge autoconf / automake update changes from GCC. 2018-10-31 17:10:56 +00:00
README
README-maintainer-mode Bump to autoconf 2.69 and automake 1.15.1 2018-06-19 16:55:06 -04:00
setup.com
src-release.sh src-release.sh: add libbacktrace to GDB_SUPPORT_DIRS 2021-09-28 12:21:21 +01:00
symlink-tree
test-driver Bump to autoconf 2.69 and automake 1.15.1 2018-06-19 16:55:06 -04:00
ylwrap

		   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.