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+/* Definitions for dealing with stack frames, for GDB, the GNU debugger.
+ Copyright (C) 1986, 1989 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+GDB 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 1, or (at your option)
+any later version.
+
+GDB is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GDB; see the file COPYING. If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+/* Note that frame.h requires param.h! */
+
+/*
+ * FRAME is the type of the identifier of a specific stack frame. It
+ * is a pointer to the frame cache item corresponding to this frame.
+ * Please note that frame id's are *not* constant over calls to the
+ * inferior. Use frame addresses, which are.
+ *
+ * FRAME_ADDR is the type of the address of a specific frame. I
+ * cannot imagine a case in which this would not be CORE_ADDR, so
+ * maybe it's silly to give it it's own type. Life's rough.
+ *
+ * FRAME_FP is a macro which converts from a frame identifier into a
+ * frame_address.
+ *
+ * FRAME_INFO_ID is a macro which "converts" from a frame info pointer
+ * to a frame id. This is here in case I or someone else decides to
+ * change the FRAME type again.
+ *
+ * This file and blockframe.c are the only places which are allowed to
+ * use the equivalence between FRAME and struct frame_info *. EXCEPTION:
+ * value.h uses CORE_ADDR instead of FRAME_ADDR because the compiler
+ * will accept that in the absense of this file.
+ */
+typedef struct frame_info *FRAME;
+typedef CORE_ADDR FRAME_ADDR;
+#define FRAME_FP(fr) ((fr)->frame)
+#define FRAME_INFO_ID(f) (f)
+
+/*
+ * Caching structure for stack frames. This is also the structure
+ * used for extended info about stack frames. May add more to this
+ * structure as it becomes necessary.
+ *
+ * Note that the first entry in the cache will always refer to the
+ * innermost executing frame. This value should be set (is it?
+ * Check) in something like normal_stop.
+ */
+struct frame_info
+ {
+ /* Nominal address of the frame described. */
+ FRAME_ADDR frame;
+ /* Address at which execution is occurring in this frame.
+ For the innermost frame, it's the current pc.
+ For other frames, it is a pc saved in the next frame. */
+ CORE_ADDR pc;
+ /* The frame called by the frame we are describing, or 0.
+ This may be set even if there isn't a frame called by the one
+ we are describing (.->next == 0); in that case it is simply the
+ bottom of this frame */
+ FRAME_ADDR next_frame;
+ /* Anything extra for this structure that may have been defined
+ in the machine depedent files. */
+#ifdef EXTRA_FRAME_INFO
+ EXTRA_FRAME_INFO
+#endif
+ /* Pointers to the next and previous frame_info's in this stack. */
+ FRAME next, prev;
+ };
+
+/* Describe the saved registers of a frame. */
+
+struct frame_saved_regs
+ {
+ /* For each register, address of where it was saved on entry to the frame,
+ or zero if it was not saved on entry to this frame. */
+ CORE_ADDR regs[NUM_REGS];
+ };
+
+/* The stack frame that the user has specified for commands to act on.
+ Note that one cannot assume this is the address of valid data. */
+
+extern FRAME selected_frame;
+
+extern struct frame_info *get_frame_info ();
+extern struct frame_info *get_prev_frame_info ();
+
+extern FRAME create_new_frame ();
+
+extern void get_frame_saved_regs ();
+
+extern FRAME get_prev_frame ();
+extern FRAME get_current_frame ();
+extern FRAME get_next_frame ();
+
+extern struct block *get_frame_block ();
+extern struct block *get_current_block ();
+extern struct block *get_selected_block ();
+extern struct symbol *get_frame_function ();
+extern struct symbol *get_pc_function ();
+
+/* In stack.c */
+extern FRAME find_relative_frame ();
+
+/* Generic pointer value indicating "I don't know." */
+#define Frame_unknown (CORE_ADDR)-1