From: Simon Marchi <simark@simark.ca>
To: Tom Tromey <tom@tromey.com>, gdb-patches@sourceware.org
Subject: Re: [PATCH 03/14] Introduce dwarf2_per_objfile::obstack
Date: Wed, 19 Feb 2020 04:13:00 -0000 [thread overview]
Message-ID: <b01063a5-3c18-58a3-f163-6161dd3ed53f@simark.ca> (raw)
In-Reply-To: <20200215165444.32653-4-tom@tromey.com>
On 2020-02-15 11:54 a.m., Tom Tromey wrote:
> Currently much of the DWARF-related data is stored on the obfile
> obstack. This prevents sharing this data across objfiles, so this
> patch adds a new obstack to dwarf2_per_objfile.
>
> One way to check whether this is correct is to look at the remaining
> uses of objfile_obstack in the DWARF code and note that they all
> appear in the "full CU" code paths.
>
> The converse -- storing per-objfile data on the shared obstack -- is
> not good, but it is just a memory leak, not a potential
> use-after-free. Double-checking this would also be useful, though.
I looked and nothing wrong stood out, but there are a lot of uses and they
are not all trivial, so I might have very well missed some mistakes.
Kind of unrelated, but while reviewing this, I noticed:
- allocate_dwo_file_hash_table
- allocate_type_unit_groups_table
- allocate_signatured_type_table
- allocate_dwp_loaded_cutus_table
- allocate_dwo_unit_table
All have objfile parameters which are unused and could probably be removed. In at least
one instance, it would allow removing ann objfile local variable.
> @@ -3202,8 +3200,12 @@ dw2_get_real_path (struct objfile *objfile,
> struct quick_file_names *qfn, int index)
> {
> if (qfn->real_names == NULL)
> - qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
> - qfn->num_file_names, const char *);
> + {
> + struct dwarf2_per_objfile *dwarf2_per_objfile
> + = get_dwarf2_per_objfile (objfile);
> + qfn->real_names = OBSTACK_CALLOC (&dwarf2_per_objfile->obstack,
> + qfn->num_file_names, const char *);
> + }
The callers of dw2_get_real_path should be able to pass the dwarf2_per_objfile directly,
instead of the objfile, simplifying this.
Simon
next prev parent reply other threads:[~2020-02-19 4:13 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-15 16:54 [PATCH 00/14] Share DWARF partial symtabs between objfiles Tom Tromey
2020-02-15 16:55 ` [PATCH 07/14] Add dwarf2_per_cu_data::index Tom Tromey
2020-02-18 11:39 ` Luis Machado
2020-02-21 23:36 ` Tom Tromey
2020-02-19 4:36 ` Simon Marchi
2020-02-19 5:31 ` Simon Marchi
2020-02-21 23:41 ` Tom Tromey
2020-02-21 23:41 ` Tom Tromey
2020-02-15 16:55 ` [PATCH 05/14] Introduce dwarf2_unshareable and move die_type_hash Tom Tromey
2020-02-18 11:23 ` Luis Machado
2020-02-19 4:20 ` Simon Marchi
2020-02-21 22:43 ` Tom Tromey
2020-02-15 16:55 ` [PATCH 12/14] Fix a memory leak and remove an unused member Tom Tromey
2020-02-15 16:55 ` [PATCH 04/14] Convert IS_TYPE_UNIT_GROUP to method Tom Tromey
2020-02-15 16:55 ` [PATCH 01/14] Fix latent bug in dwarf2_find_containing_comp_unit Tom Tromey
2020-02-19 3:42 ` Simon Marchi
2020-02-19 14:08 ` Tom Tromey
2020-02-20 0:11 ` Tom Tromey
2020-02-20 0:12 ` Tom Tromey
2020-02-20 15:44 ` Simon Marchi
2020-02-20 16:50 ` Tom Tromey
2020-03-07 19:12 ` Christian Biesinger
2020-02-15 16:55 ` [PATCH 09/14] Add objfile member to DWARF batons Tom Tromey
2020-02-15 16:55 ` [PATCH 14/14] Share DWARF partial symtabs Tom Tromey
2020-02-18 12:26 ` Luis Machado
2020-02-21 23:03 ` Tom Tromey
2020-02-15 16:55 ` [PATCH 13/14] Move signatured_type::type to unshareable object Tom Tromey
2020-02-15 16:55 ` [PATCH 06/14] Add "objfile" parameter to two partial_symtab methods Tom Tromey
2020-02-18 11:26 ` Luis Machado
2020-02-15 16:55 ` [PATCH 11/14] Split type_unit_group Tom Tromey
2020-02-18 12:08 ` Luis Machado
2020-02-22 0:40 ` Tom Tromey
2020-02-15 16:55 ` [PATCH 08/14] Remove symtab links from dwarf2_psymtab and dwarf2_per_cu_quick_data Tom Tromey
2020-02-18 11:50 ` Luis Machado
2020-02-19 4:47 ` Simon Marchi
2020-02-22 0:38 ` Tom Tromey
2020-02-22 0:36 ` Tom Tromey
2020-02-15 16:55 ` [PATCH 10/14] Introduce dwarf2_enter_objfile and use it Tom Tromey
2020-02-18 11:58 ` Luis Machado
2020-02-21 22:54 ` Tom Tromey
2020-02-15 16:55 ` [PATCH 03/14] Introduce dwarf2_per_objfile::obstack Tom Tromey
2020-02-19 4:13 ` Simon Marchi [this message]
2020-02-22 0:44 ` Tom Tromey
2020-02-15 16:55 ` [PATCH 02/14] Simplify setting of reading_partial_symbols Tom Tromey
2020-02-17 12:31 ` [PATCH 00/14] Share DWARF partial symtabs between objfiles Luis Machado
2020-02-17 16:59 ` Tom Tromey
2020-02-22 21:50 ` Tom de Vries
2020-02-22 22:01 ` Tom Tromey
2020-02-23 2:37 ` Simon Marchi
2020-02-23 23:58 ` Tom Tromey
2020-02-24 2:52 ` Simon Marchi
2020-02-24 3:07 ` Tom Tromey
2020-02-24 3:22 ` Tom Tromey
2020-02-24 13:42 ` Tom de Vries
2020-02-24 16:00 ` Tom de Vries
2020-02-24 17:29 ` Tom Tromey
2020-02-24 23:15 ` Tom Tromey
2020-02-24 19:18 ` Simon Marchi
2020-02-24 23:20 ` Tom Tromey
2020-02-24 22:48 ` Tom Tromey
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