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Remove hashtab_obstack_allocate

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I think that hashtabs should never be obstack-allocated.  In the past
this was convenient sometimes, because any new data structure needed a
corresponding cleanup.  However, with the switch to C++, resource
management has become much simpler; for example, a local variable can
simply be of type htab_up rather than hashtab_t, and the problem is
solved.

This patch removes hashtab_obstack_allocate to try to prevent this
anti-pattern from being used again.
This commit is contained in:
Tom Tromey 2024-06-05 09:51:08 -06:00
parent 4122e647d5
commit 9f71296fda
4 changed files with 1 additions and 53 deletions
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1
gdbsupport/Makefile.am
View File

@ -68,7 +68,6 @@ libgdbsupport_a_SOURCES = \
filestuff.cc \
format.cc \
gdb-dlfcn.cc \
gdb-hashtab.cc \
gdb_obstack.cc \
gdb_regex.cc \
gdb_tilde_expand.cc \

5
gdbsupport/Makefile.in
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@ -159,8 +159,7 @@ am_libgdbsupport_a_OBJECTS = agent.$(OBJEXT) btrace-common.$(OBJEXT) \
common-regcache.$(OBJEXT) common-utils.$(OBJEXT) \
environ.$(OBJEXT) errors.$(OBJEXT) event-loop.$(OBJEXT) \
fileio.$(OBJEXT) filestuff.$(OBJEXT) format.$(OBJEXT) \
gdb-dlfcn.$(OBJEXT) gdb-hashtab.$(OBJEXT) \
gdb_obstack.$(OBJEXT) gdb_regex.$(OBJEXT) \
gdb-dlfcn.$(OBJEXT) gdb_obstack.$(OBJEXT) gdb_regex.$(OBJEXT) \
gdb_tilde_expand.$(OBJEXT) gdb_wait.$(OBJEXT) \
gdb_vecs.$(OBJEXT) job-control.$(OBJEXT) netstuff.$(OBJEXT) \
new-op.$(OBJEXT) pathstuff.$(OBJEXT) print-utils.$(OBJEXT) \
@ -426,7 +425,6 @@ libgdbsupport_a_SOURCES = \
filestuff.cc \
format.cc \
gdb-dlfcn.cc \
gdb-hashtab.cc \
gdb_obstack.cc \
gdb_regex.cc \
gdb_tilde_expand.cc \
@ -536,7 +534,6 @@ distclean-compile:
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/filestuff.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/format.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gdb-dlfcn.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gdb-hashtab.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gdb_obstack.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gdb_regex.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gdb_tilde_expand.Po@am__quote@

43
gdbsupport/gdb-hashtab.cc
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@ -1,43 +0,0 @@
/* Hash table wrappers for gdb.
Copyright (C) 2021-2024 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "gdb-hashtab.h"
/* Allocation function for the libiberty hash table which uses an
obstack. The obstack is passed as DATA. */
void *
hashtab_obstack_allocate (void *data, size_t size, size_t count)
{
size_t total = size * count;
void *ptr = obstack_alloc ((struct obstack *) data, total);
memset (ptr, 0, total);
return ptr;
}
/* Trivial deallocation function for the libiberty splay tree and hash
table - don't deallocate anything. Rely on later deletion of the
obstack. DATA will be the obstack, although it is not needed
here. */
void
dummy_obstack_deallocate (void *object, void *data)
{
return;
}

5
gdbsupport/gdb-hashtab.h
View File

@ -42,9 +42,4 @@ htab_delete_entry (void *ptr)
delete (T *) ptr;
}
/* Allocation and deallocation functions for the libiberty hash table
which use obstacks. */
void *hashtab_obstack_allocate (void *data, size_t size, size_t count);
void dummy_obstack_deallocate (void *object, void *data);
#endif /* GDBSUPPORT_GDB_HASHTAB_H */