Make catchpoint inherit breakpoint, eliminate init_raw_breakpoint

struct catchpoint's ctor currently calls init_raw_breakpoint, which is
a bit weird, as that ctor-like function takes a sal argument, but
catchpoints don't have code locations.

Instead, make struct catchpoint's ctor add the catchpoint's dummy
location using add_dummy_location.

init_raw_breakpoint uses add_location under the hood, and with a dummy
sal it would ultimately use the breakpoint's gdbarch for the
location's gdbarch, so replace the references to loc->gdbarch (which
is now NULL) in syscall_catchpoint to references to the catchpoint's
gdbarch.

struct catchpoint's ctor was the last user of init_raw_breakpoint, so
this commit eliminates the latter.

Since catchpoint locations aren't code locations, make struct
catchpoint inherit struct breakpoint instead of base_breakpoint.  This
let's us delete the tracepoint::re_set override too.

Change-Id: Ib428bf71efb09fdaf399c56e4372b0f41d9c5869

gdb/break-catch-syscall.c

diff --git a/gdb/break-catch-syscall.c b/gdb/break-catch-syscall.c
index af55ecb..06d4846 100644
--- a/gdb/break-catch-syscall.c
+++ b/gdb/break-catch-syscall.c
@@ -197,7 +197,7 @@ syscall_catchpoint::print_it (const bpstat *bs) const
      must print "called syscall" or "returned from syscall".  */
   struct target_waitstatus last;
   struct syscall s;
-  struct gdbarch *gdbarch = bs->bp_location_at->gdbarch;
+  struct gdbarch *gdbarch = b->gdbarch;
 
   get_last_target_status (nullptr, nullptr, &last);
 
@@ -242,7 +242,7 @@ syscall_catchpoint::print_one (bp_location **last_loc) const
 {
   struct value_print_options opts;
   struct ui_out *uiout = current_uiout;
-  struct gdbarch *gdbarch = loc->gdbarch;
+  struct gdbarch *gdbarch = loc->owner->gdbarch;
 
   get_user_print_options (&opts);
   /* Field 4, the address, is omitted (which makes the columns not
@@ -293,7 +293,7 @@ syscall_catchpoint::print_one (bp_location **last_loc) const
 void
 syscall_catchpoint::print_mention () const
 {
-  struct gdbarch *gdbarch = loc->gdbarch;
+  struct gdbarch *gdbarch = loc->owner->gdbarch;
 
   if (!syscalls_to_be_caught.empty ())
     {

gdb/breakpoint.c

diff --git a/gdb/breakpoint.c b/gdb/breakpoint.c
index 0ba2ea2..96cf1ee 100644
--- a/gdb/breakpoint.c
+++ b/gdb/breakpoint.c
@@ -7266,30 +7266,6 @@ get_sal_arch (struct symtab_and_line sal)
   return NULL;
 }
 
-/* Low level routine for partially initializing a breakpoint of type
-   BPTYPE.  The newly created breakpoint's address, section, source
-   file name, and line number are provided by SAL.
-
-   It is expected that the caller will complete the initialization of
-   the newly created breakpoint struct as well as output any status
-   information regarding the creation of a new breakpoint.  */
-
-static void
-init_raw_breakpoint (struct breakpoint *b, struct symtab_and_line sal,
-		     enum bptype bptype)
-{
-  b->add_location (sal);
-
-  if (bptype != bp_catchpoint)
-    gdb_assert (sal.pspace != NULL);
-
-  /* Store the program space that was used to set the breakpoint,
-     except for ordinary breakpoints, which are independent of the
-     program space.  */
-  if (bptype != bp_breakpoint && bptype != bp_hardware_breakpoint)
-    b->pspace = sal.pspace;
-}
-
 /* Call this routine when stepping and nexting to enable a breakpoint
    if we do a longjmp() or 'throw' in TP.  FRAME is the frame which
    initiated the operation.  */
@@ -7751,12 +7727,11 @@ disable_breakpoints_in_freed_objfile (struct objfile *objfile)
 
 catchpoint::catchpoint (struct gdbarch *gdbarch, bool temp,
 			const char *cond_string_)
-  : base_breakpoint (gdbarch, bp_catchpoint)
+  : breakpoint (gdbarch, bp_catchpoint)
 {
-  symtab_and_line sal;
-  sal.pspace = current_program_space;
+  add_dummy_location (this, current_program_space);
 
-  init_raw_breakpoint (this, sal, bp_catchpoint);
+  pspace = current_program_space;
 
   if (cond_string_ != nullptr)
     cond_string = make_unique_xstrdup (cond_string_);

gdb/breakpoint.h

diff --git a/gdb/breakpoint.h b/gdb/breakpoint.h
index 7375e97..21dd8d5 100644
--- a/gdb/breakpoint.h
+++ b/gdb/breakpoint.h
@@ -1030,18 +1030,13 @@ struct tracepoint : public base_breakpoint
 
 /* The base class for catchpoints.  */
 
-struct catchpoint : public base_breakpoint
+struct catchpoint : public breakpoint
 {
   /* If TEMP is true, then make the breakpoint temporary.  If
      COND_STRING is not NULL, then store it in the breakpoint.  */
   catchpoint (struct gdbarch *gdbarch, bool temp, const char *cond_string);
 
   ~catchpoint () override = 0;
-
-  void re_set () override
-  {
-    /* For catchpoints, the default is to do nothing.  */
-  }
 };