Support breakpoint.locations (#1068)

If gdb is recent enough this patch uses `breakpoint.locations` to
extract directly the address at which the breakpoints are set instead of
parsing the command used by the user.

gef.py

@@ -7619,7 +7619,12 @@ def context_code(self) -> None:
  cur_insn_color = gef.config["theme.disassemble_current_instruction"]
  pc = gef.arch.pc
  breakpoints = gdb.breakpoints() or []
- bp_locations = [b.location for b in breakpoints if b.location and b.location.startswith("*")]
+ # breakpoint.locations was introduced in gdb 13.1
+ if len(breakpoints) and hasattr(breakpoints[-1], "locations"):
+ bp_locations = [hex(location.address) for b in breakpoints for location in b.locations if location is not None]
+ else:
+ # location relies on the user setting the breakpoints with "b *{hex(address)}"
+ bp_locations = [b.location for b in breakpoints if b.location and b.location.startswith("*")]
 
  frame = gdb.selected_frame()
  arch_name = f"{gef.arch.arch.lower()}:{gef.arch.mode}"