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Andrew Burgess 11da1b13b3 gdbsupport: add checked_static_cast
This commit was inspired by these mailing list posts:

  https://sourceware.org/pipermail/gdb-patches/2022-June/190323.html
  https://sourceware.org/pipermail/gdb-patches/2022-April/188098.html

The idea is to add a new function gdb::checked_static_cast, which can,
in some cases, be used as a drop-in replacement for static_cast.  And
so, if I previously wrote this:

  BaseClass *base = get_base_class_pointer ();
  DerivedClass *derived = static_cast<DerivedClass *> (base);

I can now write:

  BaseClass *base = get_base_class_pointer ();
  DerivedClass *derived = gdb::checked_static_cast<DerivedClass *> (base);

The requirement is that BaseClass and DerivedClass must be
polymorphic.

The benefit of making this change is that, when GDB is built in
developer mode, a run-time check will be made to ensure that `base`
really is of type DerivedClass before the cast is performed.  If
`base` is not of type DerivedClass then GDB will assert.

In a non-developer build gdb::checked_static_cast is equivalent to a
static_cast, and there should be no performance difference.

This commit adds the support function, but does not make use of this
function, a use will be added in the next commit.

Co-Authored-By: Pedro Alves <pedro@palves.net>
Co-Authored-By: Tom Tromey <tom@tromey.com>
2022-07-21 15:19:43 +01:00
bfd PowerPC64: fix build error on 32-bit hosts 2022-07-21 13:35:51 +09:30
binutils PR29390, DW_CFA_AARCH64_negate_ra_state vs. DW_CFA_GNU_window_save 2022-07-21 16:37:06 +09:30
config Add markers for 2.39 branch 2022-07-08 10:41:07 +01:00
contrib
cpu Add markers for 2.39 branch 2022-07-08 10:41:07 +01:00
elfcpp Add markers for 2.39 branch 2022-07-08 10:41:07 +01:00
etc
gas x86/Intel: correct AVX512F scatter insn element sizes 2022-07-21 12:32:04 +02:00
gdb gdb: move the type cast into gdbarch_tdep 2022-07-21 15:19:42 +01:00
gdbserver gdbserver: remove unused variable 2022-07-13 20:10:18 +08:00
gdbsupport gdbsupport: add checked_static_cast 2022-07-21 15:19:43 +01:00
gnulib gnulib: update to bd11400942d6 2022-05-02 10:54:19 -04:00
gold Update version to 2.39.50 and regenerate files 2022-07-08 11:19:44 +01:00
gprof Regenerate with automake-1.15.1 2022-07-09 20:10:47 +09:30
gprofng gprofng: link libgprofng.so against -lpthread 2022-07-18 10:42:02 -07:00
include [AArch64] Support AArch64 MTE memory tag dumps in core files 2022-07-19 15:24:27 +01:00
intl
ld x86: Disallow invalid relocations against protected symbols 2022-07-19 08:41:52 -07:00
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libctf Add markers for 2.39 branch 2022-07-08 10:41:07 +01:00
libdecnumber Merge config/ changes from GCC, to enable DFP on AArch64 2022-05-24 10:47:29 +01:00
libiberty Add markers for 2.39 branch 2022-07-08 10:41:07 +01:00
opcodes x86: replace wrong attributes on VCVTDQ2PH{X,Y} 2022-07-21 12:32:25 +02:00
readline gdb/readline: fix extra 'quit' message problem 2022-05-07 10:49:27 +01:00
sim sim: fix BFD_VMA format arguments on 32-bit hosts [PR gdb/29184] 2022-06-15 23:12:56 +01:00
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configure [gdb/build] Fix build breaker with --enable-shared 2022-06-27 15:36:19 +02:00
configure.ac [gdb/build] Fix build breaker with --enable-shared 2022-06-27 15:36:19 +02:00
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		   README for GNU development tools

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