change probes to be program-space-independent

This changes the probes to be independent of the program space.

After this, when a probe's address is needed, it is determined by
applying offsets at the point of use.

This introduces a bound_probe object, similar to bound minimal
symbols.  Objects of this type are used when it's necessary to pass a
probe and its corresponding objfile.

This removes the backlink from probe to objfile, which was primarily
used to fetch the architecture to use.

This adds a get_probe_address function which calls a probe method to
compute the probe's relocated address.  Similarly, it adds an objfile
parameter to the semaphore methods so they can do the relocation
properly as well.

2014-03-03  Tom Tromey  <tromey@redhat.com>

	* break-catch-throw.c (fetch_probe_arguments): Use bound probes.
	* breakpoint.c (create_longjmp_master_breakpoint): Use
	get_probe_address.
	(add_location_to_breakpoint, bkpt_probe_insert_location)
	(bkpt_probe_remove_location): Update.
	* breakpoint.h (struct bp_location) <probe>: Now a bound_probe.
	* elfread.c (elf_symfile_relocate_probe): Remove.
	(elf_probe_fns): Update.
	(insert_exception_resume_breakpoint): Change type of "probe"
	parameter to bound_probe.
	(check_exception_resume): Update.
	* objfiles.c (objfile_relocate1): Don't relocate probes.
	* probe.c (bound_probe_s): New typedef.
	(parse_probes): Use get_probe_address.  Set sal's objfile.
	(find_probe_by_pc): Return a bound_probe.
	(collect_probes): Return a VEC(bound_probe_s).
	(compare_probes): Update.
	(gen_ui_out_table_header_info): Change type of "probes"
	parameter.  Update.
	(info_probes_for_ops): Update.
	(get_probe_address): New function.
	(probe_safe_evaluate_at_pc): Update.
	* probe.h (struct probe_ops) <get_probe_address>: New field.
	<set_semaphore, clear_semaphore>: Add objfile parameter.
	(struct probe) <objfile>: Remove field.
	<arch>: New field.
	<address>: Update comment.
	(struct bound_probe): New.
	(find_probe_by_pc): Return a bound_probe.
	(get_probe_address): Declare.
	* solib-svr4.c (struct probe_and_action) <address>: New field.
	(hash_probe_and_action, equal_probe_and_action): Update.
	(register_solib_event_probe): Add address parameter.
	(solib_event_probe_at): Update.
	(svr4_create_probe_breakpoints): Add objfile parameter.  Use
	get_probe_address.
	* stap-probe.c (struct stap_probe) <sem_addr>: Update comment.
	(stap_get_probe_address): New function.
	(stap_can_evaluate_probe_arguments, compute_probe_arg)
	(compile_probe_arg): Update.
	(stap_set_semaphore, stap_clear_semaphore): Compute semaphore's
	address.
	(handle_stap_probe): Don't relocate the probe.
	(stap_relocate): Remove.
	(stap_gen_info_probes_table_values): Update.
	(stap_probe_ops): Remove stap_relocate.
	* symfile-debug.c (debug_sym_relocate_probe): Remove.
	(debug_sym_probe_fns): Update.
	* symfile.h (struct sym_probe_fns) <sym_relocate_probe>: Remove.
	* symtab.c (init_sal): Use memset.
	* symtab.h (struct symtab_and_line) <objfile>: New field.
	* tracepoint.c (start_tracing, stop_tracing): Update.

gdb/breakpoint.c

@@ -3323,7 +3323,9 @@ create_longjmp_master_breakpoint (void)
 	    {
 	      struct breakpoint *b;
 
-	      b = create_internal_breakpoint (gdbarch, probe->address,
+	      b = create_internal_breakpoint (gdbarch,
+					      get_probe_address (probe,
+								 objfile),
 					      bp_longjmp_master,
 					      &internal_breakpoint_ops);
 	      b->addr_string = xstrdup ("-probe-stap libc:longjmp");
@@ -3484,7 +3486,9 @@ create_exception_master_breakpoint (void)
 	    {
 	      struct breakpoint *b;
 
-	      b = create_internal_breakpoint (gdbarch, probe->address,
+	      b = create_internal_breakpoint (gdbarch,
+					      get_probe_address (probe,
+								 objfile),
 					      bp_exception_master,
 					      &internal_breakpoint_ops);
 	      b->addr_string = xstrdup ("-probe-stap libgcc:unwind");
@@ -9023,7 +9027,8 @@ add_location_to_breakpoint (struct breakpoint *b,
   loc->requested_address = sal->pc;
   loc->address = adjusted_address;
   loc->pspace = sal->pspace;
-  loc->probe = sal->probe;
+  loc->probe.probe = sal->probe;
+  loc->probe.objfile = sal->objfile;
   gdb_assert (loc->pspace != NULL);
   loc->section = sal->section;
   loc->gdbarch = loc_gdbarch;
@@ -13340,7 +13345,9 @@ bkpt_probe_insert_location (struct bp_location *bl)
     {
       /* The insertion was successful, now let's set the probe's semaphore
 	 if needed.  */
-      bl->probe->pops->set_semaphore (bl->probe, bl->gdbarch);
+      bl->probe.probe->pops->set_semaphore (bl->probe.probe,
+					    bl->probe.objfile,
+					    bl->gdbarch);
     }
 
   return v;
@@ -13350,7 +13357,9 @@ static int
 bkpt_probe_remove_location (struct bp_location *bl)
 {
   /* Let's clear the semaphore before removing the location.  */
-  bl->probe->pops->clear_semaphore (bl->probe, bl->gdbarch);
+  bl->probe.probe->pops->clear_semaphore (bl->probe.probe,
+					  bl->probe.objfile,
+					  bl->gdbarch);
 
   return bkpt_remove_location (bl);
 }