From e2904e1ff0b0158cf6d8d335ca3f80ff7dc9eb6c Mon Sep 17 00:00:00 2001 From: Tom Tromey Date: Sat, 21 May 2022 09:50:13 -0600 Subject: [PATCH] Use unique_ptr for objfiles A while back, I changed objfiles to be held via a shared_ptr. The idea at the time was that this was a step toward writing to the index cache in the background, and this would let gdb keep a reference alive to do so. However, since then we've rewritten the DWARF reader, and the new index can do this without requiring a shared pointer -- in fact there are patches pending to implement this. This patch switches objfile management to unique_ptr, which makes more sense now. Regression tested on x86-64 Fedora 34. --- gdb/objfiles.c | 4 +--- gdb/objfiles.h | 2 +- gdb/progspace.c | 6 +++--- gdb/progspace.h | 8 ++++---- 4 files changed, 9 insertions(+), 11 deletions(-) diff --git a/gdb/objfiles.c b/gdb/objfiles.c index 80f68fda1c1..60d8aa5cb78 100644 --- a/gdb/objfiles.c +++ b/gdb/objfiles.c @@ -468,9 +468,7 @@ objfile::make (bfd *bfd_, const char *name_, objfile_flags flags_, if (parent != nullptr) add_separate_debug_objfile (result, parent); - /* Using std::make_shared might be a bit nicer here, but that would - require making the constructor public. */ - current_program_space->add_objfile (std::shared_ptr (result), + current_program_space->add_objfile (std::unique_ptr (result), parent); /* Rebuild section map next time we need it. */ diff --git a/gdb/objfiles.h b/gdb/objfiles.h index 9da12ff12e0..a7098b46279 100644 --- a/gdb/objfiles.h +++ b/gdb/objfiles.h @@ -409,7 +409,7 @@ public: remove it from the program space's list. In some cases, you may need to hold a reference to an objfile that is independent of its existence on the program space's list; for this case, the - destructor must be public so that shared_ptr can reference + destructor must be public so that unique_ptr can reference it. */ ~objfile (); diff --git a/gdb/progspace.c b/gdb/progspace.c index 1ee4fe3f940..8735343fabc 100644 --- a/gdb/progspace.c +++ b/gdb/progspace.c @@ -174,7 +174,7 @@ program_space::free_all_objfiles () /* See progspace.h. */ void -program_space::add_objfile (std::shared_ptr &&objfile, +program_space::add_objfile (std::unique_ptr &&objfile, struct objfile *before) { if (before == nullptr) @@ -182,7 +182,7 @@ program_space::add_objfile (std::shared_ptr &&objfile, else { auto iter = std::find_if (objfiles_list.begin (), objfiles_list.end (), - [=] (const std::shared_ptr<::objfile> &objf) + [=] (const std::unique_ptr<::objfile> &objf) { return objf.get () == before; }); @@ -203,7 +203,7 @@ program_space::remove_objfile (struct objfile *objfile) reinit_frame_cache (); auto iter = std::find_if (objfiles_list.begin (), objfiles_list.end (), - [=] (const std::shared_ptr<::objfile> &objf) + [=] (const std::unique_ptr<::objfile> &objf) { return objf.get () == objfile; }); diff --git a/gdb/progspace.h b/gdb/progspace.h index 73beb7a4710..662e569488e 100644 --- a/gdb/progspace.h +++ b/gdb/progspace.h @@ -41,9 +41,9 @@ struct program_space_data; struct address_space_data; struct so_list; -typedef std::list> objfile_list; +typedef std::list> objfile_list; -/* An iterator that wraps an iterator over std::shared_ptr, +/* An iterator that wraps an iterator over std::unique_ptr, and dereferences the returned object. This is useful for iterating over a list of shared pointers and returning raw pointers -- which helped avoid touching a lot of code when changing how objfiles are @@ -234,7 +234,7 @@ struct program_space /* Add OBJFILE to the list of objfiles, putting it just before BEFORE. If BEFORE is nullptr, it will go at the end of the list. */ - void add_objfile (std::shared_ptr &&objfile, + void add_objfile (std::unique_ptr &&objfile, struct objfile *before); /* Remove OBJFILE from the list of objfiles. */ @@ -354,7 +354,7 @@ struct program_space struct objfile *symfile_object_file = NULL; /* All known objfiles are kept in a linked list. */ - std::list> objfiles_list; + std::list> objfiles_list; /* List of shared objects mapped into this space. Managed by solib.c. */ -- 2.30.2