gdb: move all "current target" wrapper implementations to target.c

gdb: move all "current target" wrapper implementations to target.c

The following patch removes the current_top_target function, replacing
uses with `current_inferior ()->top_target ()`.  This is a problem for
uses in target.h, because they don't have access to the current_inferior
function and the inferior structure: target.h can't include inferior.h,
otherwise that would make a cyclic inclusion.

Avoid this by moving all implementations of the wrappers that call
target methods with the current target to target.c.  Many of them are
changed from a macro to a function, which is an improvement for
readability and debuggability, IMO.

target_shortname and target_longname were not function-like macros, so a
few adjustments are needed.

gdb/ChangeLog:

	* target.h (target_shortname): Change to function declaration.
	(target_longname): Likewise.
	(target_attach_no_wait): Likewise.
	(target_post_attach): Likewise.
	(target_prepare_to_store): Likewise.
	(target_supports_enable_disable_tracepoint): Likewise.
	(target_supports_string_tracing): Likewise.
	(target_supports_evaluation_of_breakpoint_conditions): Likewise.
	(target_supports_dumpcore): Likewise.
	(target_dumpcore): Likewise.
	(target_can_run_breakpoint_commands): Likewise.
	(target_files_info): Likewise.
	(target_post_startup_inferior): Likewise.
	(target_insert_fork_catchpoint): Likewise.
	(target_remove_fork_catchpoint): Likewise.
	(target_insert_vfork_catchpoint): Likewise.
	(target_remove_vfork_catchpoint): Likewise.
	(target_insert_exec_catchpoint): Likewise.
	(target_remove_exec_catchpoint): Likewise.
	(target_set_syscall_catchpoint): Likewise.
	(target_rcmd): Likewise.
	(target_can_lock_scheduler): Likewise.
	(target_can_async_p): Likewise.
	(target_is_async_p): Likewise.
	(target_execution_direction): Likewise.
	(target_extra_thread_info): Likewise.
	(target_pid_to_exec_file): Likewise.
	(target_thread_architecture): Likewise.
	(target_find_memory_regions): Likewise.
	(target_make_corefile_notes): Likewise.
	(target_get_bookmark): Likewise.
	(target_goto_bookmark): Likewise.
	(target_stopped_by_watchpoint): Likewise.
	(target_stopped_by_sw_breakpoint): Likewise.
	(target_supports_stopped_by_sw_breakpoint): Likewise.
	(target_stopped_by_hw_breakpoint): Likewise.
	(target_supports_stopped_by_hw_breakpoint): Likewise.
	(target_have_steppable_watchpoint): Likewise.
	(target_can_use_hardware_watchpoint): Likewise.
	(target_region_ok_for_hw_watchpoint): Likewise.
	(target_can_do_single_step): Likewise.
	(target_insert_watchpoint): Likewise.
	(target_remove_watchpoint): Likewise.
	(target_insert_hw_breakpoint): Likewise.
	(target_remove_hw_breakpoint): Likewise.
	(target_can_accel_watchpoint_condition): Likewise.
	(target_can_execute_reverse): Likewise.
	(target_get_ada_task_ptid): Likewise.
	(target_filesystem_is_local): Likewise.
	(target_trace_init): Likewise.
	(target_download_tracepoint): Likewise.
	(target_can_download_tracepoint): Likewise.
	(target_download_trace_state_variable): Likewise.
	(target_enable_tracepoint): Likewise.
	(target_disable_tracepoint): Likewise.
	(target_trace_start): Likewise.
	(target_trace_set_readonly_regions): Likewise.
	(target_get_trace_status): Likewise.
	(target_get_tracepoint_status): Likewise.
	(target_trace_stop): Likewise.
	(target_trace_find): Likewise.
	(target_get_trace_state_variable_value): Likewise.
	(target_save_trace_data): Likewise.
	(target_upload_tracepoints): Likewise.
	(target_upload_trace_state_variables): Likewise.
	(target_get_raw_trace_data): Likewise.
	(target_get_min_fast_tracepoint_insn_len): Likewise.
	(target_set_disconnected_tracing): Likewise.
	(target_set_circular_trace_buffer): Likewise.
	(target_set_trace_buffer_size): Likewise.
	(target_set_trace_notes): Likewise.
	(target_get_tib_address): Likewise.
	(target_set_permissions): Likewise.
	(target_static_tracepoint_marker_at): Likewise.
	(target_static_tracepoint_markers_by_strid): Likewise.
	(target_traceframe_info): Likewise.
	(target_use_agent): Likewise.
	(target_can_use_agent): Likewise.
	(target_augmented_libraries_svr4_read): Likewise.
	(target_log_command): Likewise.
	* target.c (target_shortname): New.
	(target_longname): New.
	(target_attach_no_wait): New.
	(target_post_attach): New.
	(target_prepare_to_store): New.
	(target_supports_enable_disable_tracepoint): New.
	(target_supports_string_tracing): New.
	(target_supports_evaluation_of_breakpoint_conditions): New.
	(target_supports_dumpcore): New.
	(target_dumpcore): New.
	(target_can_run_breakpoint_commands): New.
	(target_files_info): New.
	(target_post_startup_inferior): New.
	(target_insert_fork_catchpoint): New.
	(target_remove_fork_catchpoint): New.
	(target_insert_vfork_catchpoint): New.
	(target_remove_vfork_catchpoint): New.
	(target_insert_exec_catchpoint): New.
	(target_remove_exec_catchpoint): New.
	(target_set_syscall_catchpoint): New.
	(target_rcmd): New.
	(target_can_lock_scheduler): New.
	(target_can_async_p): New.
	(target_is_async_p): New.
	(target_execution_direction): New.
	(target_extra_thread_info): New.
	(target_pid_to_exec_file): New.
	(target_thread_architecture): New.
	(target_find_memory_regions): New.
	(target_make_corefile_notes): New.
	(target_get_bookmark): New.
	(target_goto_bookmark): New.
	(target_stopped_by_watchpoint): New.
	(target_stopped_by_sw_breakpoint): New.
	(target_supports_stopped_by_sw_breakpoint): New.
	(target_stopped_by_hw_breakpoint): New.
	(target_supports_stopped_by_hw_breakpoint): New.
	(target_have_steppable_watchpoint): New.
	(target_can_use_hardware_watchpoint): New.
	(target_region_ok_for_hw_watchpoint): New.
	(target_can_do_single_step): New.
	(target_insert_watchpoint): New.
	(target_remove_watchpoint): New.
	(target_insert_hw_breakpoint): New.
	(target_remove_hw_breakpoint): New.
	(target_can_accel_watchpoint_condition): New.
	(target_can_execute_reverse): New.
	(target_get_ada_task_ptid): New.
	(target_filesystem_is_local): New.
	(target_trace_init): New.
	(target_download_tracepoint): New.
	(target_can_download_tracepoint): New.
	(target_download_trace_state_variable): New.
	(target_enable_tracepoint): New.
	(target_disable_tracepoint): New.
	(target_trace_start): New.
	(target_trace_set_readonly_regions): New.
	(target_get_trace_status): New.
	(target_get_tracepoint_status): New.
	(target_trace_stop): New.
	(target_trace_find): New.
	(target_get_trace_state_variable_value): New.
	(target_save_trace_data): New.
	(target_upload_tracepoints): New.
	(target_upload_trace_state_variables): New.
	(target_get_raw_trace_data): New.
	(target_get_min_fast_tracepoint_insn_len): New.
	(target_set_disconnected_tracing): New.
	(target_set_circular_trace_buffer): New.
	(target_set_trace_buffer_size): New.
	(target_set_trace_notes): New.
	(target_get_tib_address): New.
	(target_set_permissions): New.
	(target_static_tracepoint_marker_at): New.
	(target_static_tracepoint_markers_by_strid): New.
	(target_traceframe_info): New.
	(target_use_agent): New.
	(target_can_use_agent): New.
	(target_augmented_libraries_svr4_read): New.
	(target_log_command): New.
	* bfin-tdep.c (bfin_sw_breakpoint_from_kind): Adjust.
	* infrun.c (set_schedlock_func): Adjust.
	* mi/mi-main.c (exec_reverse_continue): Adjust.
	* reverse.c (exec_reverse_once): Adjust.
	* sh-tdep.c (sh_sw_breakpoint_from_kind): Adjust.
	* tui/tui-stack.c (tui_locator_window::make_status_line): Adjust.
	* remote-sim.c (gdbsim_target::detach): Adjust.
	(gdbsim_target::files_info): Adjust.

Change-Id: I72ef56e9a25adeb0b91f1ad05e34c89f77ebeaa8