Make single-step breakpoints be per-thread

This patch finally makes each thread have its own set of single-step
breakpoints.  This paves the way to have multiple threads software
single-stepping, though this patch doesn't flip that switch on yet.
That'll be done on a subsequent patch.

gdb/
2014-10-15  Pedro Alves  <palves@redhat.com>

	* breakpoint.c (single_step_breakpoints): Delete global.
	(insert_single_step_breakpoint): Adjust to store the breakpoint
	pointer in the current thread.
	(single_step_breakpoints_inserted, remove_single_step_breakpoints)
	(cancel_single_step_breakpoints): Delete functions.
	(breakpoint_has_location_inserted_here): Make extern.
	(single_step_breakpoint_inserted_here_p): Adjust to walk the
	breakpoint list.
	* breakpoint.h (breakpoint_has_location_inserted_here): New
	declaration.
	(single_step_breakpoints_inserted, remove_single_step_breakpoints)
	(cancel_single_step_breakpoints): Remove declarations.
	* gdbthread.h (struct thread_control_state)
	<single_step_breakpoints>: New field.
	(delete_single_step_breakpoints)
	(thread_has_single_step_breakpoints_set)
	(thread_has_single_step_breakpoint_here): New declarations.
	* infrun.c (follow_exec): Also clear the single-step breakpoints.
	(singlestep_breakpoints_inserted_p, singlestep_ptid)
	(singlestep_pc): Delete globals.
	(infrun_thread_ptid_changed): Remove references to removed
	globals.
	(resume_cleanups): Delete the current thread's single-step
	breakpoints.
	(maybe_software_singlestep): Remove references to removed globals.
	(resume): Adjust to use thread_has_single_step_breakpoints_set and
	delete_single_step_breakpoints.
	(init_wait_for_inferior): Remove references to removed globals.
	(delete_thread_infrun_breakpoints): Delete the thread's
	single-step breakpoints too.
	(delete_just_stopped_threads_infrun_breakpoints): Don't delete
	single-step breakpoints here.
	(delete_stopped_threads_single_step_breakpoints): New function.
	(adjust_pc_after_break): Adjust to use
	thread_has_single_step_breakpoints_set.
	(handle_inferior_event): Remove references to removed globals.
	Use delete_stopped_threads_single_step_breakpoints.
	(handle_signal_stop): Adjust to per-thread single-step
	breakpoints.  Swap test order to do cheaper tests first.
	(switch_back_to_stepped_thread): Extend debug output.  Remove
	references to removed globals.
	* record-full.c (record_full_wait_1): Adjust to per-thread
	single-step breakpoints.
	* thread.c (delete_single_step_breakpoints)
	(thread_has_single_step_breakpoints_set)
	(thread_has_single_step_breakpoint_here): New functions.
	(clear_thread_inferior_resources): Also delete the thread's
	single-step breakpoints.

1 files changed, 6 insertions, 4 deletions

diff --git a/gdb/breakpoint.h b/gdb/breakpoint.h
index 8b833bd2e0..cd3e7eedf6 100644
--- a/gdb/breakpoint.h
+++ b/gdb/breakpoint.h
@@ -1129,6 +1129,12 @@ extern int regular_breakpoint_inserted_here_p (struct address_space *,
 extern int software_breakpoint_inserted_here_p (struct address_space *, 
 						CORE_ADDR);
 
+/* Check whether any location of BP is inserted at PC.  */
+
+extern int breakpoint_has_location_inserted_here (struct breakpoint *bp,
+						  struct address_space *aspace,
+						  CORE_ADDR pc);
+
 extern int single_step_breakpoint_inserted_here_p (struct address_space *,
 						   CORE_ADDR);
 
@@ -1463,10 +1469,6 @@ extern void delete_command (char *arg, int from_tty);
 extern void insert_single_step_breakpoint (struct gdbarch *,
 					   struct address_space *, 
 					   CORE_ADDR);
-extern int single_step_breakpoints_inserted (void);
-extern void remove_single_step_breakpoints (void);
-extern void cancel_single_step_breakpoints (void);
-
 /* Check if any hardware watchpoints have triggered, according to the
    target.  */
 int watchpoints_triggered (struct target_waitstatus *);