mirror of
git://gcc.gnu.org/git/gcc.git
synced 2025-04-19 01:00:52 +08:00
7c82dd6c02
This is a pretty rare situation since the C++11 change to make all destructors default to noexcept, but it is still possible to define throwing destructors, and if a destructor for a local variable throws during the return, we've already constructed the return value, so now we need to destroy it. I handled this somewhat like the new-expression cleanup; as in that case, this cleanup can't properly nest with the cleanups for local variables, so I introduce a cleanup region around the whole function and a flag variable to indicate whether the return value actually needs to be destroyed. Setting the flag requires giving a COMPOUND_EXPR as the operand of a RETURN_EXPR, so I adjust gimplify_return_expr to handle that. This doesn't currently work with deduced return type because we don't know the type when we're deciding whether to introduce the cleanup region. gcc/ * gimplify.c (gimplify_return_expr): Handle COMPOUND_EXPR. gcc/cp/ * cp-tree.h (current_retval_sentinel): New macro. * decl.c (start_preparsed_function): Set up cleanup for retval. * typeck.c (check_return_expr): Set current_retval_sentinel.
This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the files whose names start with COPYING for copying permission. The manuals, and some of the runtime libraries, are under different terms; see the individual source files for details. The directory INSTALL contains copies of the installation information as HTML and plain text. The source of this information is gcc/doc/install.texi. The installation information includes details of what is included in the GCC sources and what files GCC installs. See the file gcc/doc/gcc.texi (together with other files that it includes) for usage and porting information. An online readable version of the manual is in the files gcc/doc/gcc.info*. See http://gcc.gnu.org/bugs/ for how to report bugs usefully. Copyright years on GCC source files may be listed using range notation, e.g., 1987-2012, indicating that every year in the range, inclusive, is a copyrightable year that could otherwise be listed individually.