16b5661a6f
- Merge from gdb-7.5.1-30.fc18.src.rpm.
7.5.1 gives:
* An "Attempt to dereference a generic pointer" errors (-var-create).
* Backtrace problems on x32 (PR backtrace/14646).
* next/step/finish problems on x32 (PR gdb/14647).
* A "malformed linespec error: unexpected keyword, [...]" error
(PR breakpoints/14643).
* GDB crash while stepping through powerpc (32bits) code.
* A failed assertion in linux_ptrace_test_ret_to_nx.
* A "!frame_id_inlined_p (frame_id)" failed assertion.
* A "No more reverse-execution history." error during reverse
"next" execution (PR 14548).
* Incomplete command descriptions in "apropos" output.
* PR gdb/14494 (a GDB crash difficult to characterize).
7.5 gives:
* Go language support.
* New targets (x32 ABI, microMIPS, Renesas RL78, HP OpenVMS ia64).
* More Python scripting improvements.
* SDT (Static Defined Tracing) probes support with SystemTap probes.
* GDBserver improvements (stdio connections, target-side evaluation
of breakpoint conditions, remote protocol improvements).
* Other miscellaneous improvements (ability to stop when a shared
library is loaded/unloaded, dynamic printf, etc).
* Reverse debugging on ARM.
- Do not provide a custom (safe) auto-load dir.
OBS-URL: https://build.opensuse.org/request/show/147743
OBS-URL: https://build.opensuse.org/package/show/openSUSE:Factory/gdb?expand=0&rev=90
148 lines
5.6 KiB
Diff
148 lines
5.6 KiB
Diff
2012-07-30 Gary Benson <gbenson@redhat.com>
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* objfiles.h (inhibit_section_map_updates): New function
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declaration.
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(resume_section_map_updates): Likewise.
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(resume_section_map_updates_cleanup): Likewise.
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* objfiles.c (objfile_pspace_info): New field "inhibit_updates".
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(find_pc_section): Do not update the section map if
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inhibit_updates is set.
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(inhibit_section_map_updates): New function.
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(resume_section_map_updates): Likewise.
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(resume_section_map_updates_cleanup): Likewise.
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* solib-svr4.c (svr4_handle_solib_event): Inhibit section map
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updates for calls to evaluate_probe_argument.
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Index: gdb-7.4.91.20120814/gdb/objfiles.h
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===================================================================
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--- gdb-7.4.91.20120814.orig/gdb/objfiles.h 2012-08-14 17:16:54.000000000 +0200
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+++ gdb-7.4.91.20120814/gdb/objfiles.h 2012-08-14 17:20:55.913174609 +0200
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@@ -526,6 +526,22 @@ extern void set_objfile_data (struct obj
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extern void *objfile_data (struct objfile *objfile,
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const struct objfile_data *data);
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+/* In normal use, the section map will be rebuilt by FIND_PC_SECTION
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+ if objfiles have been added, removed or relocated since it was last
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+ called. Calling INHIBIT_SECTION_MAP_UPDATES will inhibit this
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+ behavior until RESUME_SECTION_MAP_UPDATES is called. If you call
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+ INHIBIT_SECTION_MAP_UPDATES you must ensure that every call to
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+ FIND_PC_SECTION in the inhibited region relates to a section that
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+ is already in the section map and has not since been removed or
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+ relocated. */
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+extern void inhibit_section_map_updates (void);
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+
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+/* Resume automatically rebuilding the section map as required. */
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+extern void resume_section_map_updates (void);
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+
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+/* Version of the above suitable for use as a cleanup. */
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+extern void resume_section_map_updates_cleanup (void *arg);
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+
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extern void default_iterate_over_objfiles_in_search_order
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(struct gdbarch *gdbarch,
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iterate_over_objfiles_in_search_order_cb_ftype *cb,
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Index: gdb-7.4.91.20120814/gdb/objfiles.c
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===================================================================
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--- gdb-7.4.91.20120814.orig/gdb/objfiles.c 2012-08-14 17:16:55.000000000 +0200
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+++ gdb-7.4.91.20120814/gdb/objfiles.c 2012-08-14 17:20:55.915174609 +0200
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@@ -70,6 +70,9 @@ struct objfile_pspace_info
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int objfiles_changed_p;
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struct obj_section **sections;
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int num_sections;
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+
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+ /* Nonzero if section map updates should be inhibited. */
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+ int inhibit_updates;
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};
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/* Per-program-space data key. */
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@@ -1295,7 +1298,7 @@ find_pc_section (CORE_ADDR pc)
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return s;
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pspace_info = get_objfile_pspace_data (current_program_space);
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- if (pspace_info->objfiles_changed_p != 0)
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+ if (pspace_info->objfiles_changed_p && !pspace_info->inhibit_updates)
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{
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update_section_map (current_program_space,
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&pspace_info->sections,
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@@ -1463,6 +1466,30 @@ objfiles_changed (void)
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get_objfile_pspace_data (current_program_space)->objfiles_changed_p = 1;
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}
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+/* See comments in objfiles.h. */
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+
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+void
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+inhibit_section_map_updates (void)
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+{
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+ get_objfile_pspace_data (current_program_space)->inhibit_updates = 1;
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+}
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+
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+/* See comments in objfiles.h. */
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+
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+void
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+resume_section_map_updates (void)
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+{
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+ get_objfile_pspace_data (current_program_space)->inhibit_updates = 0;
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+}
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+
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+/* See comments in objfiles.h. */
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+
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+void
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+resume_section_map_updates_cleanup (void *arg)
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+{
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+ resume_section_map_updates ();
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+}
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+
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/* The default implementation for the "iterate_over_objfiles_in_search_order"
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gdbarch method. It is equivalent to use the ALL_OBJFILES macro,
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searching the objfiles in the order they are stored internally,
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Index: gdb-7.4.91.20120814/gdb/solib-svr4.c
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===================================================================
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--- gdb-7.4.91.20120814.orig/gdb/solib-svr4.c 2012-08-14 17:20:42.000000000 +0200
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+++ gdb-7.4.91.20120814/gdb/solib-svr4.c 2012-08-14 17:21:14.090169216 +0200
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@@ -1847,6 +1847,7 @@ svr4_handle_solib_event (bpstat bs)
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struct svr4_info *info = get_svr4_info ();
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struct probe_and_info buf, *pi = &buf;
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enum probe_action action;
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+ struct cleanup *cleanups = NULL;
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struct value *val;
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LONGEST lmid;
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CORE_ADDR debug_base, lm = 0;
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@@ -1870,6 +1871,19 @@ svr4_handle_solib_event (bpstat bs)
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if (action == NAMESPACE_NO_ACTION)
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return;
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+ /* EVALUATE_PROBE_ARGUMENT looks up symbols in the dynamic linker
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+ using FIND_PC_SECTION. FIND_PC_SECTION is accelerated by a cache
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+ called the section map. The section map is invalidated every
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+ time a shared library is loaded or unloaded, and if the inferior
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+ is generating a lot of shared library events then the section map
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+ will be updated every time SVR4_HANDLE_SOLIB_EVENT is called.
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+ We called FIND_PC_SECTION in SVR4_CREATE_SOLIB_EVENT_BREAKPOINTS,
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+ so we can guarantee that the dynamic linker's sections are in the
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+ section map. We can therefore inhibit section map updates across
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+ these calls to EVALUATE_PROBE_ARGUMENT and save a lot of time. */
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+ inhibit_section_map_updates ();
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+ cleanups = make_cleanup (resume_section_map_updates_cleanup, NULL);
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+
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val = evaluate_probe_argument (pi->probe, 0);
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if (val == NULL)
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goto error;
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@@ -1901,6 +1915,9 @@ svr4_handle_solib_event (bpstat bs)
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action = NAMESPACE_RELOAD;
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}
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+ do_cleanups (cleanups);
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+ cleanups = NULL;
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+
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if (action == NAMESPACE_UPDATE_OR_RELOAD)
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{
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if (namespace_update_incremental (info, lmid, lm, is_initial_ns))
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@@ -1923,6 +1940,8 @@ svr4_handle_solib_event (bpstat bs)
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warning (_("Probes-based dynamic linker interface failed.\n"
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"Reverting to original interface.\n"));
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+ if (cleanups != NULL)
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+ do_cleanups (cleanups);
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free_namespace_table (info);
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free_probes (info);
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info->using_probes = 0;
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