X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Fdummy-frame.h;h=1d43510947131f1868874c6290b168cff707b271;hb=39ec04904ff172dd67fd43ed3720f26d854732bf;hp=d1a4bc8b459239f891653e4c40a37764d0c7948c;hpb=618ce49fa299c97b2f1d3827ab8626f512bdc5f4;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/dummy-frame.h b/gdb/dummy-frame.h index d1a4bc8b45..1d43510947 100644 --- a/gdb/dummy-frame.h +++ b/gdb/dummy-frame.h @@ -1,12 +1,12 @@ /* Code dealing with dummy stack frames, for GDB, the GNU debugger. - Copyright 2002 Free Software Foundation, Inc. + Copyright (C) 2002-2020 Free Software Foundation, Inc. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or + the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, @@ -15,71 +15,69 @@ GNU General Public License for more details. You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ + along with this program. If not, see . */ #if !defined (DUMMY_FRAME_H) #define DUMMY_FRAME_H 1 -struct frame_info; -struct regcache; +#include "frame.h" + +struct infcall_suspend_state; struct frame_unwind; -struct frame_id; - -/* GENERIC DUMMY FRAMES - - The following code serves to maintain the dummy stack frames for - inferior function calls (ie. when gdb calls into the inferior via - call_function_by_hand). This code saves the machine state before - the call in host memory, so we must maintain an independent stack - and keep it consistant etc. I am attempting to make this code - generic enough to be used by many targets. - - The cheapest and most generic way to do CALL_DUMMY on a new target - is probably to define CALL_DUMMY to be empty, CALL_DUMMY_LENGTH to - zero, and CALL_DUMMY_LOCATION to AT_ENTRY. Then you must remember - to define PUSH_RETURN_ADDRESS, because no call instruction will be - being executed by the target. Also DEPRECATED_FRAME_CHAIN_VALID as - generic_{file,func}_frame_chain_valid and FIX_CALL_DUMMY as - generic_fix_call_dummy. */ +class thread_info; -/* If the PC falls in a dummy frame, return a dummy frame - unwinder. */ +/* Push the information needed to identify, and unwind from, a dummy + frame onto the dummy frame stack. */ + +/* NOTE: cagney/2004-08-02: In the case of ABIs using push_dummy_code + containing more than one instruction, this interface many need to + be expanded so that it knowns the lower/upper extent of the dummy + frame's code. */ + +extern void dummy_frame_push (infcall_suspend_state *caller_state, + const frame_id *dummy_id, + thread_info *thread); -extern const struct frame_unwind *dummy_frame_p (CORE_ADDR pc); +/* Pop the dummy frame DUMMY_ID, restoring program state to that before the + frame was created. + On return reinit_frame_cache has been called. + If the frame isn't found, flag an internal error. -/* Does the PC fall in a dummy frame? + NOTE: This can only pop the one frame, even if it is in the middle of the + stack, because the other frames may be for different threads, and there's + currently no way to tell which stack frame is for which thread. */ + +extern void dummy_frame_pop (frame_id dummy_id, thread_info *thread); + +extern void dummy_frame_discard (frame_id dummy_id, thread_info *thread); + +/* If the PC falls in a dummy frame, return a dummy frame + unwinder. */ - This function is used by "frame.c" when creating a new `struct - frame_info'. +extern const struct frame_unwind dummy_frame_unwind; - Note that there is also very similar code in breakpoint.c (where - the bpstat stop reason is computed). It is looking for a PC - falling on a dummy_frame breakpoint. Perhaphs this, and that code - should be combined? +/* Destructor for dummy_frame. DATA is supplied by registrant. + REGISTERS_VALID is 1 for dummy_frame_pop, 0 for dummy_frame_discard. */ +typedef void (dummy_frame_dtor_ftype) (void *data, int registers_valid); - Architecture dependant code, that has access to a frame, should not - use this function. Instead (get_frame_type() == DUMMY_FRAME) - should be used. +/* Call DTOR with DTOR_DATA when DUMMY_ID frame of thread THREAD gets + discarded. Dummy frame with DUMMY_ID must exist. Multiple + destructors may be registered, they will be called in the reverse + order of registrations (LIFO). */ +extern void register_dummy_frame_dtor (frame_id dummy_id, + thread_info *thread, + dummy_frame_dtor_ftype *dtor, + void *dtor_data); - Hmm, but what about threads? When the dummy-frame code tries to - relocate a dummy frame's saved registers it definitly needs to - differentiate between threads (otherwize it will do things like - clean-up the wrong threads frames). However, when just trying to - identify a dummy-frame that shouldn't matter. The wost that can - happen is that a thread is marked as sitting in a dummy frame when, - in reality, its corrupted its stack, to the point that a PC is - pointing into a dummy frame. */ +/* Return 1 if there exists any dummy frame with any of its registered + destructors equal to both DTOR and DTOR_DATA. Return 0 otherwise. */ +extern int find_dummy_frame_dtor (dummy_frame_dtor_ftype *dtor, + void *dtor_data); -extern int pc_in_dummy_frame (CORE_ADDR pc); +/* Default implementation of gdbarch_dummy_id. Generate a dummy frame_id + for THIS_FRAME assuming that the frame is a dummy frame. */ -/* Return the regcache that belongs to the dummy-frame identifed by PC - and FP, or NULL if no such frame exists. */ -/* FIXME: cagney/2002-11-08: The function only exists because of - deprecated_generic_get_saved_register. Eliminate that function and - this, to, can go. */ +extern struct frame_id default_dummy_id (struct gdbarch *gdbarch, + struct frame_info *this_frame); -extern struct regcache *generic_find_dummy_frame (CORE_ADDR pc, - CORE_ADDR fp); #endif /* !defined (DUMMY_FRAME_H) */