From patchwork Wed Feb 13 13:45:04 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tom Tromey X-Patchwork-Id: 31437 Received: (qmail 86226 invoked by alias); 13 Feb 2019 13:45:24 -0000 Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-patches-owner@sourceware.org Delivered-To: mailing list gdb-patches@sourceware.org Received: (qmail 86050 invoked by uid 89); 13 Feb 2019 13:45:20 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-26.9 required=5.0 tests=BAYES_00, GIT_PATCH_0, GIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3, RCVD_IN_DNSWL_NONE, SPF_PASS autolearn=ham version=3.3.2 spammy=Hx-languages-length:6030 X-HELO: rock.gnat.com Received: from rock.gnat.com (HELO rock.gnat.com) (205.232.38.15) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Wed, 13 Feb 2019 13:45:13 +0000 Received: from localhost (localhost.localdomain [127.0.0.1]) by filtered-rock.gnat.com (Postfix) with ESMTP id 6D003560C5; Wed, 13 Feb 2019 08:45:11 -0500 (EST) Received: from rock.gnat.com ([127.0.0.1]) by localhost (rock.gnat.com [127.0.0.1]) (amavisd-new, port 10024) with LMTP id VzFLF4mxIR1U; Wed, 13 Feb 2019 08:45:11 -0500 (EST) Received: from murgatroyd.Home (75-166-72-210.hlrn.qwest.net [75.166.72.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by rock.gnat.com (Postfix) with ESMTPSA id 1942F5607B; Wed, 13 Feb 2019 08:45:11 -0500 (EST) From: Tom Tromey To: gdb-patches@sourceware.org Cc: Tom Tromey Subject: [PATCH 1/2] C++-ify bp_location Date: Wed, 13 Feb 2019 06:45:04 -0700 Message-Id: <20190213134505.20005-2-tromey@adacore.com> In-Reply-To: <20190213134505.20005-1-tromey@adacore.com> References: <20190213134505.20005-1-tromey@adacore.com> MIME-Version: 1.0 Philippe noticed a memory leak coming from ada_catchpoint_location -- it was not freeing the "function_name" member from its base class: ==14141== 114 bytes in 4 blocks are definitely lost in loss record 1,055 of 3,424 ==14141== at 0x4C2BE6D: malloc (vg_replace_malloc.c:309) ==14141== by 0x405107: xmalloc (common-utils.c:44) ==14141== by 0x7563F9: xstrdup (xstrdup.c:34) ==14141== by 0x3B82B3: set_breakpoint_location_function(bp_location*, int) (breakpoint.c:7156) ==14141== by 0x3C112B: add_location_to_breakpoint(breakpoint*, symtab_and_line const*) (breakpoint.c:8609) ==14141== by 0x3C127A: init_raw_breakpoint(breakpoint*, gdbarch*, symtab_and_line, bptype, breakpoint_ops const*) (breakpoint.c:7187) ==14141== by 0x3C1B52: init_ada_exception_breakpoint(breakpoint*, gdbarch*, symtab_and_line, char const*, breakpoint_ops const*, int, int, int) (breakpoint.c:11262) ==14141== by 0x381C2E: create_ada_exception_catchpoint(gdbarch*, ada_exception_catchpoint_kind, std::__cxx11::basic_string, std::allocator > const&, std::__cxx11::basic_string, std::allocator > const&, int, int, int) (ada-lang.c:13255) This patch fixes the problem by further C++-ifying bp_location. In particular, bp_location_ops is now removed, and the "dtor" function pointer is replaced with an ordinary destructor. gdb/ChangeLog 2019-02-13 Philippe Waroquiers Tom Tromey * breakpoint.c (~bp_location): Rename from bp_location_dtor. (bp_location_ops): Remove. (base_breakpoint_allocate_location): Update. (free_bp_location): Update. * ada-lang.c (class ada_catchpoint_location) : Remove ops parameter. (ada_catchpoint_location_dtor): Remove. (ada_catchpoint_location_ops): Remove. (allocate_location_exception): Update. * breakpoint.h (struct bp_location_ops): Remove. (class bp_location) : Remove bp_location_ops parameter. <~bp_location>: Add destructor. : Remove. --- gdb/ChangeLog | 18 ++++++++++++++++++ gdb/ada-lang.c | 24 +++--------------------- gdb/breakpoint.c | 20 ++++---------------- gdb/breakpoint.h | 18 +++--------------- 4 files changed, 28 insertions(+), 52 deletions(-) diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c index a878d4d1af2..602facb35e7 100644 --- a/gdb/ada-lang.c +++ b/gdb/ada-lang.c @@ -12396,8 +12396,8 @@ static std::string ada_exception_catchpoint_cond_string class ada_catchpoint_location : public bp_location { public: - ada_catchpoint_location (const bp_location_ops *ops, breakpoint *owner) - : bp_location (ops, owner) + ada_catchpoint_location (breakpoint *owner) + : bp_location (owner) {} /* The condition that checks whether the exception that was raised @@ -12406,24 +12406,6 @@ public: expression_up excep_cond_expr; }; -/* Implement the DTOR method in the bp_location_ops structure for all - Ada exception catchpoint kinds. */ - -static void -ada_catchpoint_location_dtor (struct bp_location *bl) -{ - struct ada_catchpoint_location *al = (struct ada_catchpoint_location *) bl; - - al->excep_cond_expr.reset (); -} - -/* The vtable to be used in Ada catchpoint locations. */ - -static const struct bp_location_ops ada_catchpoint_location_ops = -{ - ada_catchpoint_location_dtor -}; - /* An instance of this type is used to represent an Ada catchpoint. */ struct ada_catchpoint : public breakpoint @@ -12493,7 +12475,7 @@ static struct bp_location * allocate_location_exception (enum ada_exception_catchpoint_kind ex, struct breakpoint *self) { - return new ada_catchpoint_location (&ada_catchpoint_location_ops, self); + return new ada_catchpoint_location (self); } /* Implement the RE_SET method in the breakpoint_ops structure for all diff --git a/gdb/breakpoint.c b/gdb/breakpoint.c index 67d83e6f465..9be99ff4efa 100644 --- a/gdb/breakpoint.c +++ b/gdb/breakpoint.c @@ -6958,13 +6958,10 @@ adjust_breakpoint_address (struct gdbarch *gdbarch, } } -bp_location::bp_location (const bp_location_ops *ops, breakpoint *owner) +bp_location::bp_location (breakpoint *owner) { bp_location *loc = this; - gdb_assert (ops != NULL); - - loc->ops = ops; loc->owner = owner; loc->cond_bytecode = NULL; loc->shlib_disabled = 0; @@ -7033,7 +7030,6 @@ allocate_bp_location (struct breakpoint *bpt) static void free_bp_location (struct bp_location *loc) { - loc->ops->dtor (loc); delete loc; } @@ -12166,19 +12162,11 @@ say_where (struct breakpoint *b) } } -/* Default bp_location_ops methods. */ - -static void -bp_location_dtor (struct bp_location *self) +bp_location::~bp_location () { - xfree (self->function_name); + xfree (function_name); } -static const struct bp_location_ops bp_location_ops = -{ - bp_location_dtor -}; - /* Destructor for the breakpoint base class. */ breakpoint::~breakpoint () @@ -12191,7 +12179,7 @@ breakpoint::~breakpoint () static struct bp_location * base_breakpoint_allocate_location (struct breakpoint *self) { - return new bp_location (&bp_location_ops, self); + return new bp_location (self); } static void diff --git a/gdb/breakpoint.h b/gdb/breakpoint.h index 8c8c66a8158..a91e3e334cf 100644 --- a/gdb/breakpoint.h +++ b/gdb/breakpoint.h @@ -301,31 +301,19 @@ enum bp_loc_type bp_loc_other /* Miscellaneous... */ }; -/* This structure is a collection of function pointers that, if - available, will be called instead of performing the default action - for this bp_loc_type. */ - -struct bp_location_ops -{ - /* Destructor. Releases everything from SELF (but not SELF - itself). */ - void (*dtor) (struct bp_location *self); -}; - class bp_location { public: bp_location () = default; - bp_location (const bp_location_ops *ops, breakpoint *owner); + bp_location (breakpoint *owner); + + virtual ~bp_location (); /* Chain pointer to the next breakpoint location for the same parent breakpoint. */ bp_location *next = NULL; - /* Methods associated with this location. */ - const bp_location_ops *ops = NULL; - /* The reference count. */ int refc = 0;