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Tue, 01 Oct 2024 14:43:01 -0400 X-MC-Unique: JtDmdZH3MS6n5aAyUywlEw-1 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (unknown [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id BE53C196C418 for ; Tue, 1 Oct 2024 18:43:00 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.22.8.191]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 4AF6B3003E5F; Tue, 1 Oct 2024 18:42:59 +0000 (UTC) From: Guinevere Larsen To: gdb-patches@sourceware.org Cc: Guinevere Larsen Subject: [PATCH v5 1/5] gdb: make gdbarch store a vector of frame unwinders Date: Tue, 1 Oct 2024 15:42:31 -0300 Message-ID: <20241001184235.3710608-2-guinevere@redhat.com> In-Reply-To: <20241001184235.3710608-1-guinevere@redhat.com> References: <20241001184235.3710608-1-guinevere@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII"; x-default=true X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~public-inbox=simark.ca@sourceware.org From: Guinevere Larsen Before this commit, all frame unwinders would be stored in the obstack of a gdbarch and accessed by using the registry system. This made for unwieldy code, and unnecessarily complex logic in the frame_unwinder implementation, along with making frame_unwind structs be unable to have non-trivial destructors. Seeing as a future patch of this series wants to refactor the frame_unwind struct to use inheritance, and we'd like to not restrict the future derived classes on what destructors are allowed. In preparation for that change, this commit adds an std::vector to gdbarch to store the unwinders in. There should be no user-visible changes. --- gdb/arch-utils.c | 8 ++++ gdb/frame-unwind.c | 113 +++++++++++++++++---------------------------- gdb/gdbarch-gen.c | 6 +++ gdb/gdbarch.h | 5 ++ gdb/gdbarch.py | 6 +++ 5 files changed, 67 insertions(+), 71 deletions(-) diff --git a/gdb/arch-utils.c b/gdb/arch-utils.c index 6ffa4109765..5a4ed097321 100644 --- a/gdb/arch-utils.c +++ b/gdb/arch-utils.c @@ -1225,6 +1225,14 @@ obstack *gdbarch_obstack (gdbarch *arch) /* See gdbarch.h. */ +std::vector & +gdbarch_unwinder_list (struct gdbarch *arch) +{ + return arch->unwinders; +} + +/* See gdbarch.h. */ + char * gdbarch_obstack_strdup (struct gdbarch *arch, const char *string) { diff --git a/gdb/frame-unwind.c b/gdb/frame-unwind.c index e5f108d3257..b69ae8596a2 100644 --- a/gdb/frame-unwind.c +++ b/gdb/frame-unwind.c @@ -31,62 +31,46 @@ #include "cli/cli-cmds.h" #include "inferior.h" -struct frame_unwind_table_entry +/* Default sniffers, that must always be the first in the unwinder list, + no matter the architecture. */ +static constexpr auto standard_unwinders = { - const struct frame_unwind *unwinder; - struct frame_unwind_table_entry *next; -}; + &dummy_frame_unwind, + /* The DWARF tailcall sniffer must come before the inline sniffer. + Otherwise, we can end up in a situation where a DWARF frame finds + tailcall information, but then the inline sniffer claims a frame + before the tailcall sniffer, resulting in confusion. This is + safe to do always because the tailcall sniffer can only ever be + activated if the newer frame was created using the DWARF + unwinder, and it also found tailcall information. */ + &dwarf2_tailcall_frame_unwind, + &inline_frame_unwind, -struct frame_unwind_table -{ - struct frame_unwind_table_entry *list = nullptr; - /* The head of the OSABI part of the search list. */ - struct frame_unwind_table_entry **osabi_head = nullptr; }; -static const registry::key - frame_unwind_data; +/* If an unwinder should be prepended to the list, this is the + index in which it should be inserted. */ +static constexpr int prepend_unwinder_index = standard_unwinders.size (); -/* A helper function to add an unwinder to a list. LINK says where to - install the new unwinder. The new link is returned. */ - -static struct frame_unwind_table_entry ** -add_unwinder (struct obstack *obstack, const struct frame_unwind *unwinder, - struct frame_unwind_table_entry **link) +/* Start the table out with a few default sniffers. OSABI code + can't override this. */ +static void +initialize_frame_unwind_table (std::vector& table) { - *link = OBSTACK_ZALLOC (obstack, struct frame_unwind_table_entry); - (*link)->unwinder = unwinder; - return &(*link)->next; + gdb_assert (table.empty ()); + + table.insert(table.begin (), standard_unwinders.begin (), standard_unwinders.end ()); } -static struct frame_unwind_table * +/* This function call retrieves the list of frame unwinders available in + GDBARCH. If this list is empty, it is initialized before being + returned. */ +static std::vector & get_frame_unwind_table (struct gdbarch *gdbarch) { - struct frame_unwind_table *table = frame_unwind_data.get (gdbarch); - if (table != nullptr) - return table; - - table = new frame_unwind_table; - - /* Start the table out with a few default sniffers. OSABI code - can't override this. */ - struct frame_unwind_table_entry **link = &table->list; - - struct obstack *obstack = gdbarch_obstack (gdbarch); - link = add_unwinder (obstack, &dummy_frame_unwind, link); - /* The DWARF tailcall sniffer must come before the inline sniffer. - Otherwise, we can end up in a situation where a DWARF frame finds - tailcall information, but then the inline sniffer claims a frame - before the tailcall sniffer, resulting in confusion. This is - safe to do always because the tailcall sniffer can only ever be - activated if the newer frame was created using the DWARF - unwinder, and it also found tailcall information. */ - link = add_unwinder (obstack, &dwarf2_tailcall_frame_unwind, link); - link = add_unwinder (obstack, &inline_frame_unwind, link); - - /* The insertion point for OSABI sniffers. */ - table->osabi_head = link; - frame_unwind_data.set (gdbarch, table); + std::vector &table = gdbarch_unwinder_list (gdbarch); + if (table.size () == 0) + initialize_frame_unwind_table (table); return table; } @@ -95,27 +79,16 @@ void frame_unwind_prepend_unwinder (struct gdbarch *gdbarch, const struct frame_unwind *unwinder) { - struct frame_unwind_table *table = get_frame_unwind_table (gdbarch); - struct frame_unwind_table_entry *entry; - - /* Insert the new entry at the start of the list. */ - entry = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind_table_entry); - entry->unwinder = unwinder; - entry->next = (*table->osabi_head); - (*table->osabi_head) = entry; + std::vector &table = get_frame_unwind_table (gdbarch); + + table.insert (table.begin () + prepend_unwinder_index, unwinder); } void frame_unwind_append_unwinder (struct gdbarch *gdbarch, const struct frame_unwind *unwinder) { - struct frame_unwind_table *table = get_frame_unwind_table (gdbarch); - struct frame_unwind_table_entry **ip; - - /* Find the end of the list and insert the new entry there. */ - for (ip = table->osabi_head; (*ip) != NULL; ip = &(*ip)->next); - (*ip) = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind_table_entry); - (*ip)->unwinder = unwinder; + get_frame_unwind_table (gdbarch).push_back (unwinder); } /* Call SNIFFER from UNWINDER. If it succeeded set UNWINDER for @@ -188,9 +161,6 @@ frame_unwind_find_by_frame (const frame_info_ptr &this_frame, void **this_cache) FRAME_SCOPED_DEBUG_ENTER_EXIT; frame_debug_printf ("this_frame=%d", frame_relative_level (this_frame)); - struct gdbarch *gdbarch = get_frame_arch (this_frame); - struct frame_unwind_table *table = get_frame_unwind_table (gdbarch); - struct frame_unwind_table_entry *entry; const struct frame_unwind *unwinder_from_target; unwinder_from_target = target_get_unwinder (); @@ -205,8 +175,10 @@ frame_unwind_find_by_frame (const frame_info_ptr &this_frame, void **this_cache) unwinder_from_target)) return; - for (entry = table->list; entry != NULL; entry = entry->next) - if (frame_unwind_try_unwinder (this_frame, this_cache, entry->unwinder)) + struct gdbarch *gdbarch = get_frame_arch (this_frame); + std::vector &table = get_frame_unwind_table (gdbarch); + for (auto unwinder : table) + if (frame_unwind_try_unwinder (this_frame, this_cache, unwinder)) return; internal_error (_("frame_unwind_find_by_frame failed")); @@ -347,7 +319,7 @@ static void maintenance_info_frame_unwinders (const char *args, int from_tty) { gdbarch *gdbarch = current_inferior ()->arch (); - struct frame_unwind_table *table = get_frame_unwind_table (gdbarch); + std::vector &table = get_frame_unwind_table (gdbarch); ui_out *uiout = current_uiout; ui_out_emit_table table_emitter (uiout, 2, -1, "FrameUnwinders"); @@ -355,11 +327,10 @@ maintenance_info_frame_unwinders (const char *args, int from_tty) uiout->table_header (25, ui_left, "type", "Type"); uiout->table_body (); - for (struct frame_unwind_table_entry *entry = table->list; entry != NULL; - entry = entry->next) + for (auto unwinder : table) { - const char *name = entry->unwinder->name; - const char *type = frame_type_str (entry->unwinder->type); + const char *name = unwinder->name; + const char *type = frame_type_str (unwinder->type); ui_out_emit_list tuple_emitter (uiout, nullptr); uiout->field_string ("name", name); diff --git a/gdb/gdbarch-gen.c b/gdb/gdbarch-gen.c index 0d00cd7c993..03894b19bd6 100644 --- a/gdb/gdbarch-gen.c +++ b/gdb/gdbarch-gen.c @@ -27,6 +27,8 @@ /* Maintain the struct gdbarch object. */ +#include + struct gdbarch { /* Has this architecture been fully initialized? */ @@ -34,9 +36,13 @@ struct gdbarch /* An obstack bound to the lifetime of the architecture. */ auto_obstack obstack; + /* Registry. */ registry registry_fields; + /* List of frame unwinders. */ + std::vector unwinders; + /* basic architectural information. */ const struct bfd_arch_info * bfd_arch_info; enum bfd_endian byte_order; diff --git a/gdb/gdbarch.h b/gdb/gdbarch.h index 60a0f60df39..d729b16f7cb 100644 --- a/gdb/gdbarch.h +++ b/gdb/gdbarch.h @@ -30,6 +30,7 @@ #include "displaced-stepping.h" #include "gdbsupport/gdb-checked-static-cast.h" #include "registry.h" +#include "frame-unwind.h" struct floatformat; struct ui_file; @@ -310,6 +311,10 @@ extern obstack *gdbarch_obstack (gdbarch *arch); #define GDBARCH_OBSTACK_ZALLOC(GDBARCH, TYPE) obstack_zalloc (gdbarch_obstack ((GDBARCH))) +/* Return the vector of unwinders stored in a gdbarch object. */ + +std::vector &gdbarch_unwinder_list (struct gdbarch *arch); + /* Duplicate STRING, returning an equivalent string that's allocated on the obstack associated with GDBARCH. The string is freed when the corresponding architecture is also freed. */ diff --git a/gdb/gdbarch.py b/gdb/gdbarch.py index dd1658d5274..274be3ab0d7 100755 --- a/gdb/gdbarch.py +++ b/gdb/gdbarch.py @@ -125,6 +125,8 @@ with open("gdbarch-gen.c", "w") as f: print(file=f) print("/* Maintain the struct gdbarch object. */", file=f) print(file=f) + print("#include ", file=f) + print(file=f) # # The struct definition body. # @@ -135,9 +137,13 @@ with open("gdbarch-gen.c", "w") as f: print(file=f) print(" /* An obstack bound to the lifetime of the architecture. */", file=f) print(" auto_obstack obstack;", file=f) + print(file=f) print(" /* Registry. */", file=f) print(" registry registry_fields;", file=f) print(file=f) + print(" /* List of frame unwinders. */", file=f) + print(" std::vector unwinders;", file=f) + print(file=f) print(" /* basic architectural information. */", file=f) for c in filter(info, components): print(f" {c.type} {c.name};", file=f) -- 2.46.2