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authorStan Shebs <shebs@codesourcery.com>1999-04-16 01:35:26 +0000
committerStan Shebs <shebs@codesourcery.com>1999-04-16 01:35:26 +0000
commitc906108c21474dfb4ed285bcc0ac6fe02cd400cc (patch)
treea0015aa5cedc19ccbab307251353a41722a3ae13 /gdb/frame.h
parentcd946cff9ede3f30935803403f06f6ed30cad136 (diff)
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Initial creation of sourceware repositorygdb-4_18-branchpoint
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+/* Definitions for dealing with stack frames, for GDB, the GNU debugger.
+ Copyright 1986, 1989, 1991, 1992, 1999 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
+(at your option) any later version.
+
+This program 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 this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#if !defined (FRAME_H)
+#define FRAME_H 1
+
+/* Describe the saved registers of a frame. */
+
+#if defined (EXTRA_FRAME_INFO) || defined (FRAME_FIND_SAVED_REGS)
+/* XXXX - deprecated */
+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.
+ This includes special registers such as pc and fp saved in
+ special ways in the stack frame. The SP_REGNUM is even more
+ special, the address here is the sp for the next frame, not the
+ address where the sp was saved. */
+
+ CORE_ADDR regs[NUM_REGS];
+ };
+#endif
+
+/* We keep a cache of stack frames, each of which is a "struct
+ frame_info". The innermost one gets allocated (in
+ wait_for_inferior) each time the inferior stops; current_frame
+ points to it. Additional frames get allocated (in
+ get_prev_frame_info) as needed, and are chained through the next
+ and prev fields. Any time that the frame cache becomes invalid
+ (most notably when we execute something, but also if we change how
+ we interpret the frames (e.g. "set heuristic-fence-post" in
+ mips-tdep.c, or anything which reads new symbols)), we should call
+ reinit_frame_cache. */
+
+struct frame_info
+ {
+ /* Nominal address of the frame described. See comments at FRAME_FP
+ about what this means outside the *FRAME* macros; in the *FRAME*
+ macros, it can mean whatever makes most sense for this machine. */
+ CORE_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;
+
+ /* Nonzero if this is a frame associated with calling a signal handler.
+
+ Set by machine-dependent code. On some machines, if
+ the machine-dependent code fails to check for this, the backtrace
+ will look relatively normal. For example, on the i386
+ #3 0x158728 in sighold ()
+ On other machines (e.g. rs6000), the machine-dependent code better
+ set this to prevent us from trying to print it like a normal frame. */
+ int signal_handler_caller;
+
+ /* 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.
+ This includes special registers such as pc and fp saved in
+ special ways in the stack frame. The SP_REGNUM is even more
+ special, the address here is the sp for the next frame, not the
+ address where the sp was saved. */
+ /* Allocated by frame_saved_regs_zalloc () which is called /
+ initialized by FRAME_INIT_SAVED_REGS(). */
+ CORE_ADDR *saved_regs; /*NUM_REGS*/
+
+#ifdef EXTRA_FRAME_INFO
+ /* XXXX - deprecated */
+ /* Anything extra for this structure that may have been defined
+ in the machine dependent files. */
+ EXTRA_FRAME_INFO
+#endif
+
+ /* Anything extra for this structure that may have been defined
+ in the machine dependent files. */
+ /* Allocated by frame_obstack_alloc () which is called /
+ initialized by INIT_EXTRA_FRAME_INFO */
+ struct frame_extra_info *extra_info;
+
+ /* Pointers to the next and previous frame_info's in the frame cache. */
+ struct frame_info *next, *prev;
+ };
+
+/* Allocate additional space for appendices to a struct frame_info. */
+
+#ifndef SIZEOF_FRAME_SAVED_REGS
+#define SIZEOF_FRAME_SAVED_REGS (sizeof (CORE_ADDR) * (NUM_REGS))
+#endif
+extern void *frame_obstack_alloc PARAMS ((unsigned long size));
+extern void frame_saved_regs_zalloc PARAMS ((struct frame_info *));
+
+/* Dummy frame. This saves the processor state just prior to setting up the
+ inferior function call. On most targets, the registers are saved on the
+ target stack, but that really slows down function calls. */
+
+struct dummy_frame
+{
+ struct dummy_frame *next;
+
+ CORE_ADDR pc;
+ CORE_ADDR fp;
+ CORE_ADDR sp;
+ char regs[REGISTER_BYTES];
+};
+
+/* Return the frame address from FR. Except in the machine-dependent
+ *FRAME* macros, a frame address has no defined meaning other than
+ as a magic cookie which identifies a frame over calls to the
+ inferior. The only known exception is inferior.h
+ (PC_IN_CALL_DUMMY) [ON_STACK]; see comments there. You cannot
+ assume that a frame address contains enough information to
+ reconstruct the frame; if you want more than just to identify the
+ frame (e.g. be able to fetch variables relative to that frame),
+ then save the whole struct frame_info (and the next struct
+ frame_info, since the latter is used for fetching variables on some
+ machines). */
+
+#define FRAME_FP(fi) ((fi)->frame)
+
+/* Define a default FRAME_CHAIN_VALID, in the form that is suitable for most
+ targets. If FRAME_CHAIN_VALID returns zero it means that the given frame
+ is the outermost one and has no caller.
+
+ If a particular target needs a different definition, then it can override
+ the definition here by providing one in the tm file.
+
+ XXXX - both default and alternate frame_chain_valid functions are
+ deprecated. New code should use generic dummy frames. */
+
+extern int default_frame_chain_valid PARAMS ((CORE_ADDR, struct frame_info *));
+extern int alternate_frame_chain_valid PARAMS ((CORE_ADDR, struct frame_info *));
+extern int nonnull_frame_chain_valid PARAMS ((CORE_ADDR, struct frame_info *));
+extern int generic_frame_chain_valid PARAMS ((CORE_ADDR, struct frame_info *));
+
+#if !defined (FRAME_CHAIN_VALID)
+#if !defined (FRAME_CHAIN_VALID_ALTERNATE)
+#define FRAME_CHAIN_VALID(chain, thisframe) default_frame_chain_valid (chain, thisframe)
+#else
+/* Use the alternate method of avoiding running up off the end of the frame
+ chain or following frames back into the startup code. See the comments
+ in objfiles.h. */
+#define FRAME_CHAIN_VALID(chain, thisframe) alternate_frame_chain_valid (chain,thisframe)
+#endif /* FRAME_CHAIN_VALID_ALTERNATE */
+#endif /* FRAME_CHAIN_VALID */
+
+/* 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 struct frame_info *selected_frame;
+
+/* Level of the selected frame:
+ 0 for innermost, 1 for its caller, ...
+ or -1 for frame specified by address with no defined level. */
+
+extern int selected_frame_level;
+
+extern struct frame_info *get_prev_frame_info PARAMS ((struct frame_info *));
+
+extern struct frame_info *create_new_frame PARAMS ((CORE_ADDR, CORE_ADDR));
+
+extern void flush_cached_frames PARAMS ((void));
+
+extern void reinit_frame_cache PARAMS ((void));
+
+
+#ifdef FRAME_FIND_SAVED_REGS
+/* XXX - deprecated */
+#define FRAME_INIT_SAVED_REGS(FI) get_frame_saved_regs (FI, NULL)
+extern void get_frame_saved_regs PARAMS ((struct frame_info *,
+ struct frame_saved_regs *));
+#endif
+
+extern void set_current_frame PARAMS ((struct frame_info *));
+
+extern struct frame_info *get_prev_frame PARAMS ((struct frame_info *));
+
+extern struct frame_info *get_current_frame PARAMS ((void));
+
+extern struct frame_info *get_next_frame PARAMS ((struct frame_info *));
+
+extern struct block *get_frame_block PARAMS ((struct frame_info *));
+
+extern struct block *get_current_block PARAMS ((void));
+
+extern struct block *get_selected_block PARAMS ((void));
+
+extern struct symbol *get_frame_function PARAMS ((struct frame_info *));
+
+extern CORE_ADDR get_frame_pc PARAMS ((struct frame_info *));
+
+extern CORE_ADDR get_pc_function_start PARAMS ((CORE_ADDR));
+
+extern struct block * block_for_pc PARAMS ((CORE_ADDR));
+
+extern struct block * block_for_pc_sect PARAMS ((CORE_ADDR, asection *));
+
+extern int frameless_look_for_prologue PARAMS ((struct frame_info *));
+
+extern void print_frame_args PARAMS ((struct symbol *, struct frame_info *,
+ int, GDB_FILE *));
+
+extern struct frame_info *find_relative_frame PARAMS ((struct frame_info *, int*));
+
+extern void print_stack_frame PARAMS ((struct frame_info *, int, int));
+
+extern void print_only_stack_frame PARAMS ((struct frame_info *, int, int));
+
+extern void show_stack_frame PARAMS ((struct frame_info *));
+
+extern void select_frame PARAMS ((struct frame_info *, int));
+
+extern void record_selected_frame PARAMS ((CORE_ADDR *, int *));
+
+extern void select_and_print_frame PARAMS ((struct frame_info *, int));
+
+extern void print_frame_info PARAMS ((struct frame_info *, int, int, int));
+
+extern void show_frame_info PARAMS ((struct frame_info *, int, int, int));
+
+extern CORE_ADDR find_saved_register PARAMS ((struct frame_info *, int));
+
+extern struct frame_info *block_innermost_frame PARAMS ((struct block *));
+
+extern struct frame_info *find_frame_addr_in_frame_chain PARAMS ((CORE_ADDR));
+
+extern CORE_ADDR sigtramp_saved_pc PARAMS ((struct frame_info *));
+
+extern CORE_ADDR generic_read_register_dummy PARAMS ((CORE_ADDR pc,
+ CORE_ADDR fp,
+ int));
+extern void generic_push_dummy_frame PARAMS ((void));
+extern void generic_pop_current_frame PARAMS ((void (*) (struct frame_info *)));
+extern void generic_pop_dummy_frame PARAMS ((void));
+
+extern int generic_pc_in_call_dummy PARAMS ((CORE_ADDR pc,
+ CORE_ADDR fp));
+extern char * generic_find_dummy_frame PARAMS ((CORE_ADDR pc,
+ CORE_ADDR fp));
+
+#ifdef __GNUC__
+/* Some native compilers, even ones that are supposed to be ANSI and for which __STDC__
+ is true, complain about forward decls of enums. */
+enum lval_type;
+extern void generic_get_saved_register PARAMS ((char *, int *, CORE_ADDR *, struct frame_info *, int, enum lval_type *));
+#endif
+
+#endif /* !defined (FRAME_H) */