/* Definitions for dealing with stack frames, for GDB, the GNU debugger.
- Copyright 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1996,
- 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
+ Copyright (C) 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1996, 1997,
+ 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008
+ 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,
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 <http://www.gnu.org/licenses/>. */
#if !defined (FRAME_H)
#define FRAME_H 1
+/* The following is the intended naming schema for frame functions.
+ It isn't 100% consistent, but it is aproaching that. Frame naming
+ schema:
+
+ Prefixes:
+
+ get_frame_WHAT...(): Get WHAT from the THIS frame (functionaly
+ equivalent to THIS->next->unwind->what)
+
+ frame_unwind_WHAT...(): Unwind THIS frame's WHAT from the NEXT
+ frame.
+
+ put_frame_WHAT...(): Put a value into this frame (unsafe, need to
+ invalidate the frame / regcache afterwards) (better name more
+ strongly hinting at its unsafeness)
+
+ safe_....(): Safer version of various functions, doesn't throw an
+ error (leave this for later?). Returns non-zero / non-NULL if the
+ request succeeds, zero / NULL otherwize.
+
+ Suffixes:
+
+ void /frame/_WHAT(): Read WHAT's value into the buffer parameter.
+
+ ULONGEST /frame/_WHAT_unsigned(): Return an unsigned value (the
+ alternative is *frame_unsigned_WHAT).
+
+ LONGEST /frame/_WHAT_signed(): Return WHAT signed value.
+
+ What:
+
+ /frame/_memory* (frame, coreaddr, len [, buf]): Extract/return
+ *memory.
+
+ /frame/_register* (frame, regnum [, buf]): extract/return register.
+
+ CORE_ADDR /frame/_{pc,sp,...} (frame): Resume address, innner most
+ stack *address, ...
+
+ */
+
struct symtab_and_line;
struct frame_unwind;
-
-/* The traditional frame unwinder. */
-extern const struct frame_unwind *trad_frame_unwind;
+struct frame_base;
+struct block;
+struct gdbarch;
+struct ui_file;
/* The frame object. */
struct frame_id
{
- /* The frame's address. This should be constant through out the
- lifetime of a frame. */
- /* NOTE: cagney/2002-11-16: The ia64 has two stacks and hence two
- frame bases. This will need to be expanded to accomodate that. */
- CORE_ADDR base;
- /* The frame's current PC. While the PC within the function may
- change, the function that contains the PC does not. Should this
- instead be the frame's function? */
- CORE_ADDR pc;
+ /* The frame's stack address. This shall be constant through out
+ the lifetime of a frame. Note that this requirement applies to
+ not just the function body, but also the prologue and (in theory
+ at least) the epilogue. Since that value needs to fall either on
+ the boundary, or within the frame's address range, the frame's
+ outer-most address (the inner-most address of the previous frame)
+ is used. Watch out for all the legacy targets that still use the
+ function pointer register or stack pointer register. They are
+ wrong.
+
+ This field is valid only if stack_addr_p is true. Otherwise, this
+ frame represents the null frame. */
+ CORE_ADDR stack_addr;
+
+ /* The frame's code address. This shall be constant through out the
+ lifetime of the frame. While the PC (a.k.a. resume address)
+ changes as the function is executed, this code address cannot.
+ Typically, it is set to the address of the entry point of the
+ frame's function (as returned by frame_func_unwind().
+
+ This field is valid only if code_addr_p is true. Otherwise, this
+ frame is considered to have a wildcard code address, i.e. one that
+ matches every address value in frame comparisons. */
+ CORE_ADDR code_addr;
+
+ /* The frame's special address. This shall be constant through out the
+ lifetime of the frame. This is used for architectures that may have
+ frames that do not change the stack but are still distinct and have
+ some form of distinct identifier (e.g. the ia64 which uses a 2nd
+ stack for registers). This field is treated as unordered - i.e. will
+ not be used in frame ordering comparisons such as frame_id_inner().
+
+ This field is valid only if special_addr_p is true. Otherwise, this
+ frame is considered to have a wildcard special address, i.e. one that
+ matches every address value in frame comparisons. */
+ CORE_ADDR special_addr;
+
+ /* Flags to indicate the above fields have valid contents. */
+ unsigned int stack_addr_p : 1;
+ unsigned int code_addr_p : 1;
+ unsigned int special_addr_p : 1;
};
/* Methods for constructing and comparing Frame IDs.
- NOTE: Given frameless functions A and B, where A calls B (and hence
+ NOTE: Given stackless functions A and B, where A calls B (and hence
B is inner-to A). The relationships: !eq(A,B); !eq(B,A);
- !inner(A,B); !inner(B,A); all hold. This is because, while B is
- inner to A, B is not strictly inner to A (being frameless, they
- have the same .base value). */
+ !inner(A,B); !inner(B,A); all hold.
+
+ This is because, while B is inner-to A, B is not strictly inner-to A.
+ Being stackless, they have an identical .stack_addr value, and differ
+ only by their unordered .code_addr and/or .special_addr values.
+
+ Because frame_id_inner is only used as a safety net (e.g.,
+ detect a corrupt stack) the lack of strictness is not a problem.
+ Code needing to determine an exact relationship between two frames
+ must instead use frame_id_eq and frame_id_unwind. For instance,
+ in the above, to determine that A stepped-into B, the equation
+ "A.id != B.id && A.id == id_unwind (B)" can be used. */
/* For convenience. All fields are zero. */
extern const struct frame_id null_frame_id;
-/* Construct a frame ID. The second parameter isn't yet well defined.
- It might be the containing function, or the resume PC (see comment
- above in `struct frame_id')? A func/pc of zero indicates a
- wildcard (i.e., do not use func in frame ID comparisons). */
-extern struct frame_id frame_id_build (CORE_ADDR base,
- CORE_ADDR func_or_pc);
+/* Construct a frame ID. The first parameter is the frame's constant
+ stack address (typically the outer-bound), and the second the
+ frame's constant code address (typically the entry point).
+ The special identifier address is set to indicate a wild card. */
+extern struct frame_id frame_id_build (CORE_ADDR stack_addr,
+ CORE_ADDR code_addr);
+
+/* Construct a special frame ID. The first parameter is the frame's constant
+ stack address (typically the outer-bound), the second is the
+ frame's constant code address (typically the entry point),
+ and the third parameter is the frame's special identifier address. */
+extern struct frame_id frame_id_build_special (CORE_ADDR stack_addr,
+ CORE_ADDR code_addr,
+ CORE_ADDR special_addr);
+
+/* Construct a wild card frame ID. The parameter is the frame's constant
+ stack address (typically the outer-bound). The code address as well
+ as the special identifier address are set to indicate wild cards. */
+extern struct frame_id frame_id_build_wild (CORE_ADDR stack_addr);
/* Returns non-zero when L is a valid frame (a valid frame has a
non-zero .base). */
/* Returns non-zero when L is strictly inner-than R (they have
different frame .bases). Neither L, nor R can be `null'. See note
above about frameless functions. */
-extern int frame_id_inner (struct frame_id l, struct frame_id r);
+extern int frame_id_inner (struct gdbarch *gdbarch, struct frame_id l,
+ struct frame_id r);
+
+/* Write the internal representation of a frame ID on the specified
+ stream. */
+extern void fprint_frame_id (struct ui_file *file, struct frame_id id);
+
+
+/* Frame types. Some are real, some are signal trampolines, and some
+ are completely artificial (dummy). */
+enum frame_type
+{
+ /* A true stack frame, created by the target program during normal
+ execution. */
+ NORMAL_FRAME,
+ /* A fake frame, created by GDB when performing an inferior function
+ call. */
+ DUMMY_FRAME,
+ /* In a signal handler, various OSs handle this in various ways.
+ The main thing is that the frame may be far from normal. */
+ SIGTRAMP_FRAME,
+ /* Sentinel or registers frame. This frame obtains register values
+ direct from the inferior's registers. */
+ SENTINEL_FRAME
+};
/* For every stopped thread, GDB tracks two frames: current and
selected. Current frame is the inner most frame of the selected
CLI (selected using `up', `down', ...). The frames are created
on-demand (via get_prev_frame()) and then held in a frame cache. */
/* FIXME: cagney/2002-11-28: Er, there is a lie here. If you do the
- sequence: `thread 1; up; thread 2; thread 1' you loose thread 1's
+ sequence: `thread 1; up; thread 2; thread 1' you lose thread 1's
selected frame. At present GDB only tracks the selected frame of
the current thread. But be warned, that might change. */
/* FIXME: cagney/2002-11-14: At any time, only one thread's selected
/* Invalidates the frame cache (this function should have been called
invalidate_cached_frames).
- FIXME: cagney/2002-11-28: The only difference between
- flush_cached_frames() and reinit_frame_cache() is that the latter
- explicitly sets the selected frame back to the current frame there
- isn't any real difference (except that one delays the selection of
- a new frame). Code can instead simply rely on get_selected_frame()
- to reinit's the selected frame as needed. As for invalidating the
- cache, there should be two methods one that reverts the thread's
- selected frame back to current frame (for when the inferior
- resumes) and one that does not (for when the user modifies the
- target invalidating the frame cache). */
-extern void flush_cached_frames (void);
+ FIXME: cagney/2002-11-28: There should be two methods: one that
+ reverts the thread's selected frame back to current frame (for when
+ the inferior resumes) and one that does not (for when the user
+ modifies the target invalidating the frame cache). */
extern void reinit_frame_cache (void);
/* On demand, create the selected frame and then return it. If the
- selected frame can not be created, this function throws an error. */
+ selected frame can not be created, this function prints then throws
+ an error. When MESSAGE is non-NULL, use it for the error message,
+ otherwize use a generic error message. */
/* FIXME: cagney/2002-11-28: At present, when there is no selected
frame, this function always returns the current (inner most) frame.
It should instead, when a thread has previously had its frame
selected (but not resumed) and the frame cache invalidated, find
and then return that thread's previously selected frame. */
-extern struct frame_info *get_selected_frame (void);
+extern struct frame_info *get_selected_frame (const char *message);
/* Select a specific frame. NULL, apparently implies re-select the
inner most frame. */
/* Base attributes of a frame: */
/* The frame's `resume' address. Where the program will resume in
- this frame. */
+ this frame.
+
+ This replaced: frame->pc; */
extern CORE_ADDR get_frame_pc (struct frame_info *);
+/* An address (not necessarily aligned to an instruction boundary)
+ that falls within THIS frame's code block.
+
+ When a function call is the last statement in a block, the return
+ address for the call may land at the start of the next block.
+ Similarly, if a no-return function call is the last statement in
+ the function, the return address may end up pointing beyond the
+ function, and possibly at the start of the next function.
+
+ These methods make an allowance for this. For call frames, this
+ function returns the frame's PC-1 which "should" be an address in
+ the frame's block. */
+
+extern CORE_ADDR get_frame_address_in_block (struct frame_info *this_frame);
+
+/* Similar to get_frame_address_in_block, find an address in the
+ block which logically called NEXT_FRAME, assuming it is a THIS_TYPE
+ frame. */
+
+extern CORE_ADDR frame_unwind_address_in_block (struct frame_info *next_frame,
+ enum frame_type this_type);
+
+/* The frame's inner-most bound. AKA the stack-pointer. Confusingly
+ known as top-of-stack. */
+
+extern CORE_ADDR get_frame_sp (struct frame_info *);
+extern CORE_ADDR frame_sp_unwind (struct frame_info *);
+
+
+/* Following on from the `resume' address. Return the entry point
+ address of the function containing that resume address, or zero if
+ that function isn't known. */
+extern CORE_ADDR get_frame_func (struct frame_info *fi);
+
+/* Similar to get_frame_func, find the start of the function which
+ logically called NEXT_FRAME, assuming it is a THIS_TYPE frame. */
+extern CORE_ADDR frame_func_unwind (struct frame_info *next_frame,
+ enum frame_type this_type);
+
/* Closely related to the resume address, various symbol table
attributes that are determined by the PC. Note that for a normal
frame, the PC refers to the resume address after the return, and
not the call instruction. In such a case, the address is adjusted
- so that it (approximatly) identifies the call site (and not return
- site).
+ so that it (approximately) identifies the call site (and not the
+ return site).
NOTE: cagney/2002-11-28: The frame cache could be used to cache the
computed value. Working on the assumption that the bottle-neck is
extern void find_frame_sal (struct frame_info *frame,
struct symtab_and_line *sal);
-/* Return the frame address from FI. 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 (um, SEE NOTE BELOW). The only known exception is
- inferior.h (DEPRECATED_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) (um, again SEE NOTE BELOW).
-
- NOTE: cagney/2002-11-18: Actually, the frame address isn't
- sufficient for identifying a frame, and the counter examples are
- wrong!
-
- Code that needs to (re)identify a frame must use get_frame_id() and
- frame_find_by_id() (and in the future, a frame_compare() function
- instead of INNER_THAN()). Two reasons: an architecture (e.g.,
- ia64) can have more than one frame address (due to multiple stack
- pointers) (frame ID is going to be expanded to accomodate this);
- successive frameless function calls can only be differientated by
- comparing both the frame's base and the frame's enclosing function
- (frame_find_by_id() is going to be modified to perform this test).
-
- The generic dummy frame version of DEPRECATED_PC_IN_CALL_DUMMY() is
- able to identify a dummy frame using only the PC value. So the
- frame address is not needed. In fact, most
- DEPRECATED_PC_IN_CALL_DUMMY() calls now pass zero as the frame/sp
- values as the caller knows that those values won't be used. Once
- all architectures are using generic dummy frames,
- DEPRECATED_PC_IN_CALL_DUMMY() can drop the sp/frame parameters.
- When it comes to finding a dummy frame, the next frame's frame ID
- (with out duing an unwind) can be used (ok, could if it wasn't for
- the need to change the way the PPC defined frame base in a strange
- way).
-
- Modern architectures should be using something like dwarf2's
- location expression to describe where a variable lives. Such
- expressions specify their own debug info centric frame address.
- Consequently, a generic frame address is pretty meaningless. */
+/* Set the current source and line to the location given by frame
+ FRAME, if possible. When CENTER is true, adjust so the relevant
+ line is in the center of the next 'list'. */
+
+void set_current_sal_from_frame (struct frame_info *, int);
+
+/* Return the frame base (what ever that is) (DEPRECATED).
+
+ Old code was trying to use this single method for two conflicting
+ purposes. Such code needs to be updated to use either of:
+
+ get_frame_id: A low level frame unique identifier, that consists of
+ both a stack and a function address, that can be used to uniquely
+ identify a frame. This value is determined by the frame's
+ low-level unwinder, the stack part [typically] being the
+ top-of-stack of the previous frame, and the function part being the
+ function's start address. Since the correct identification of a
+ frameless function requires both the a stack and function address,
+ the old get_frame_base method was not sufficient.
+
+ get_frame_base_address: get_frame_locals_address:
+ get_frame_args_address: A set of high-level debug-info dependant
+ addresses that fall within the frame. These addresses almost
+ certainly will not match the stack address part of a frame ID (as
+ returned by get_frame_base).
+
+ This replaced: frame->frame; */
extern CORE_ADDR get_frame_base (struct frame_info *);
/* Return the per-frame unique identifer. Can be used to relocate a
frame after a frame cache flush (and other similar operations). If
- FI is NULL, return the null_frame_id. */
+ FI is NULL, return the null_frame_id.
+
+ NOTE: kettenis/20040508: These functions return a structure. On
+ platforms where structures are returned in static storage (vax,
+ m68k), this may trigger compiler bugs in code like:
+
+ if (frame_id_eq (get_frame_id (l), get_frame_id (r)))
+
+ where the return value from the first get_frame_id (l) gets
+ overwritten by the second get_frame_id (r). Please avoid writing
+ code like this. Use code like:
+
+ struct frame_id id = get_frame_id (l);
+ if (frame_id_eq (id, get_frame_id (r)))
+
+ instead, since that avoids the bug. */
extern struct frame_id get_frame_id (struct frame_info *fi);
+extern struct frame_id frame_unwind_id (struct frame_info *next_frame);
+
+/* Assuming that a frame is `normal', return its base-address, or 0 if
+ the information isn't available. NOTE: This address is really only
+ meaningful to the frame's high-level debug info. */
+extern CORE_ADDR get_frame_base_address (struct frame_info *);
+
+/* Assuming that a frame is `normal', return the base-address of the
+ local variables, or 0 if the information isn't available. NOTE:
+ This address is really only meaningful to the frame's high-level
+ debug info. Typically, the argument and locals share a single
+ base-address. */
+extern CORE_ADDR get_frame_locals_address (struct frame_info *);
+
+/* Assuming that a frame is `normal', return the base-address of the
+ parameter list, or 0 if that information isn't available. NOTE:
+ This address is really only meaningful to the frame's high-level
+ debug info. Typically, the argument and locals share a single
+ base-address. */
+extern CORE_ADDR get_frame_args_address (struct frame_info *);
/* The frame's level: 0 for innermost, 1 for its caller, ...; or -1
for an invalid frame). */
extern int frame_relative_level (struct frame_info *fi);
-/* Return the frame's type. Some are real, some are signal
- trampolines, and some are completly artificial (dummy). */
+/* Return the frame's type. */
-enum frame_type
-{
- /* A true stack frame, created by the target program during normal
- execution. */
- NORMAL_FRAME,
- /* A fake frame, created by GDB when performing an inferior function
- call. */
- DUMMY_FRAME,
- /* In a signal handler, various OSs handle this in various ways.
- The main thing is that the frame may be far from normal. */
- SIGTRAMP_FRAME
-};
extern enum frame_type get_frame_type (struct frame_info *);
-/* FIXME: cagney/2002-11-10: Some targets want to directly mark a
- frame as being of a specific type. This shouldn't be necessary.
- PC_IN_SIGTRAMP() indicates a SIGTRAMP_FRAME and
- DEPRECATED_PC_IN_CALL_DUMMY() indicates a DUMMY_FRAME. I suspect
- the real problem here is that get_prev_frame() only sets
- initialized after INIT_EXTRA_FRAME_INFO as been called.
- Consequently, some targets found that the frame's type was wrong
- and tried to fix it. The correct fix is to modify get_prev_frame()
- so that it initializes the frame's type before calling any other
- functions. */
-extern void deprecated_set_frame_type (struct frame_info *,
- enum frame_type type);
+/* For frames where we can not unwind further, describe why. */
+
+enum unwind_stop_reason
+ {
+ /* No particular reason; either we haven't tried unwinding yet,
+ or we didn't fail. */
+ UNWIND_NO_REASON,
+
+ /* The previous frame's analyzer returns an invalid result
+ from this_id.
+
+ FIXME drow/2006-08-16: This is how GDB used to indicate end of
+ stack. We should migrate to a model where frames always have a
+ valid ID, and this becomes not just an error but an internal
+ error. But that's a project for another day. */
+ UNWIND_NULL_ID,
+
+ /* All the conditions after this point are considered errors;
+ abnormal stack termination. If a backtrace stops for one
+ of these reasons, we'll let the user know. This marker
+ is not a valid stop reason. */
+ UNWIND_FIRST_ERROR,
+
+ /* This frame ID looks like it ought to belong to a NEXT frame,
+ but we got it for a PREV frame. Normally, this is a sign of
+ unwinder failure. It could also indicate stack corruption. */
+ UNWIND_INNER_ID,
+
+ /* This frame has the same ID as the previous one. That means
+ that unwinding further would almost certainly give us another
+ frame with exactly the same ID, so break the chain. Normally,
+ this is a sign of unwinder failure. It could also indicate
+ stack corruption. */
+ UNWIND_SAME_ID,
+
+ /* The frame unwinder didn't find any saved PC, but we needed
+ one to unwind further. */
+ UNWIND_NO_SAVED_PC,
+ };
+
+/* Return the reason why we can't unwind past this frame. */
+
+enum unwind_stop_reason get_frame_unwind_stop_reason (struct frame_info *);
+
+/* Translate a reason code to an informative string. */
+
+const char *frame_stop_reason_string (enum unwind_stop_reason);
/* Unwind the stack frame so that the value of REGNUM, in the previous
(up, older) frame is returned. If VALUEP is NULL, don't
extern void frame_register_unwind (struct frame_info *frame, int regnum,
int *optimizedp, enum lval_type *lvalp,
CORE_ADDR *addrp, int *realnump,
- void *valuep);
+ gdb_byte *valuep);
+
+/* Fetch a register from this, or unwind a register from the next
+ frame. Note that the get_frame methods are wrappers to
+ frame->next->unwind. They all [potentially] throw an error if the
+ fetch fails. */
-/* More convenient interface to frame_register_unwind(). */
-/* NOTE: cagney/2002-09-13: Return void as one day these functions may
- be changed to return an indication that the read succeeded. */
+extern void frame_unwind_register (struct frame_info *frame,
+ int regnum, gdb_byte *buf);
+extern void get_frame_register (struct frame_info *frame,
+ int regnum, gdb_byte *buf);
-extern void frame_unwind_signed_register (struct frame_info *frame,
- int regnum, LONGEST *val);
+extern LONGEST frame_unwind_register_signed (struct frame_info *frame,
+ int regnum);
+extern LONGEST get_frame_register_signed (struct frame_info *frame,
+ int regnum);
+extern ULONGEST frame_unwind_register_unsigned (struct frame_info *frame,
+ int regnum);
+extern ULONGEST get_frame_register_unsigned (struct frame_info *frame,
+ int regnum);
-extern void frame_unwind_unsigned_register (struct frame_info *frame,
- int regnum, ULONGEST *val);
/* Get the value of the register that belongs to this FRAME. This
- function is a wrapper to the call sequence ``frame_unwind_register
+ function is a wrapper to the call sequence ``frame_register_unwind
(get_next_frame (FRAME))''. As per frame_register_unwind(), if
VALUEP is NULL, the registers value is not fetched/computed. */
extern void frame_register (struct frame_info *frame, int regnum,
int *optimizedp, enum lval_type *lvalp,
CORE_ADDR *addrp, int *realnump,
- void *valuep);
-
-/* More convenient interface to frame_register(). */
-/* NOTE: cagney/2002-09-13: Return void as one day these functions may
- be changed to return an indication that the read succeeded. */
-
-extern void frame_read_signed_register (struct frame_info *frame,
- int regnum, LONGEST *val);
-
-extern void frame_read_unsigned_register (struct frame_info *frame,
- int regnum, ULONGEST *val);
+ gdb_byte *valuep);
+
+/* The reverse. Store a register value relative to the specified
+ frame. Note: this call makes the frame's state undefined. The
+ register and frame caches must be flushed. */
+extern void put_frame_register (struct frame_info *frame, int regnum,
+ const gdb_byte *buf);
+
+/* Read LEN bytes from one or multiple registers starting with REGNUM
+ in frame FRAME, starting at OFFSET, into BUF. */
+extern int get_frame_register_bytes (struct frame_info *frame, int regnum,
+ CORE_ADDR offset, int len,
+ gdb_byte *myaddr);
+
+/* Write LEN bytes to one or multiple registers starting with REGNUM
+ in frame FRAME, starting at OFFSET, into BUF. */
+extern void put_frame_register_bytes (struct frame_info *frame, int regnum,
+ CORE_ADDR offset, int len,
+ const gdb_byte *myaddr);
/* Map between a frame register number and its name. A frame register
space is a superset of the cooked register space --- it also
- includes builtin registers. */
+ includes builtin registers. If NAMELEN is negative, use the NAME's
+ length when doing the comparison. */
-extern int frame_map_name_to_regnum (const char *name, int strlen);
-extern const char *frame_map_regnum_to_name (int regnum);
+extern int frame_map_name_to_regnum (struct frame_info *frame,
+ const char *name, int namelen);
+extern const char *frame_map_regnum_to_name (struct frame_info *frame,
+ int regnum);
/* Unwind the PC. Strictly speaking return the resume address of the
calling frame. For GDB, `pc' is the resume address and not a
extern CORE_ADDR frame_pc_unwind (struct frame_info *frame);
-/* Unwind the frame ID. Return an ID that uniquely identifies the
- caller's frame. */
-extern struct frame_id frame_id_unwind (struct frame_info *frame);
-
/* Discard the specified frame. Restoring the registers to the state
of the caller. */
extern void frame_pop (struct frame_info *frame);
-/* 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 R (except the SP), regs[R] is the address at
- which 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.
-
- regs[SP_REGNUM] is different. It holds the actual SP, not the
- address at which it was saved. */
+/* Return memory from the specified frame. A frame knows its thread /
+ LWP and hence can find its way down to a target. The assumption
+ here is that the current and previous frame share a common address
+ space.
- CORE_ADDR regs[NUM_REGS];
- };
-#endif
+ If the memory read fails, these methods throw an error.
-/* 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) 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
- get_frame_base() 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;
-
- /* Level of this frame. The inner-most (youngest) frame is at
- level 0. As you move towards the outer-most (oldest) frame,
- the level increases. This is a cached value. It could just as
- easily be computed by counting back from the selected frame to
- the inner most frame. */
- /* NOTE: cagney/2002-04-05: Perhaphs a level of ``-1'' should be
- reserved to indicate a bogus frame - one that has been created
- just to keep GDB happy (GDB always needs a frame). For the
- moment leave this as speculation. */
- int level;
-
- /* The frame's type. */
- enum frame_type type;
-
- /* 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 previous 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 + NUM_PSEUDO_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
+ NOTE: cagney/2003-06-03: Should there be unwind versions of these
+ methods? That isn't clear. Can code, for instance, assume that
+ this and the previous frame's memory or architecture are identical?
+ If architecture / memory changes are always separated by special
+ adaptor frames this should be ok. */
- /* Anything extra for this structure that may have been defined
- in the machine dependent files. */
- /* Allocated by frame_extra_info_zalloc () which is called /
- initialized by INIT_EXTRA_FRAME_INFO */
- struct frame_extra_info *extra_info;
+extern void get_frame_memory (struct frame_info *this_frame, CORE_ADDR addr,
+ gdb_byte *buf, int len);
+extern LONGEST get_frame_memory_signed (struct frame_info *this_frame,
+ CORE_ADDR memaddr, int len);
+extern ULONGEST get_frame_memory_unsigned (struct frame_info *this_frame,
+ CORE_ADDR memaddr, int len);
- /* If dwarf2 unwind frame informations is used, this structure holds all
- related unwind data. */
- struct context *context;
+/* Same as above, but return non-zero when the entire memory read
+ succeeds, zero otherwize. */
+extern int safe_frame_unwind_memory (struct frame_info *this_frame,
+ CORE_ADDR addr, gdb_byte *buf, int len);
- /* Unwind cache shared between the unwind functions - they had
- better all agree as to the contents. */
- void *unwind_cache;
+/* Return this frame's architecture. */
- /* The frame's unwinder. */
- const struct frame_unwind *unwind;
+extern struct gdbarch *get_frame_arch (struct frame_info *this_frame);
- /* Cached copy of the previous frame's resume address. */
- int pc_unwind_cache_p;
- CORE_ADDR pc_unwind_cache;
-
- /* Cached copy of the previous frame's ID. */
- int id_unwind_cache_p;
- struct frame_id id_unwind_cache;
-
- /* Pointers to the next (down, inner, younger) and previous (up,
- outer, older) frame_info's in the frame cache. */
- struct frame_info *next; /* down, inner, younger */
- int prev_p;
- struct frame_info *prev; /* up, outer, older */
- };
-/* Values for the source flag to be used in print_frame_info_base(). */
+/* Values for the source flag to be used in print_frame_info_base(). */
enum print_what
{
/* Print only the source line, like in stepi. */
/* Allocate additional space for appendices to a struct frame_info.
NOTE: Much of GDB's code works on the assumption that the allocated
saved_regs[] array is the size specified below. If you try to make
- that array smaller, GDB will happily walk off its end. */
+ that array smaller, GDB will happily walk off its end. */
#ifdef SIZEOF_FRAME_SAVED_REGS
#error "SIZEOF_FRAME_SAVED_REGS can not be re-defined"
#endif
#define SIZEOF_FRAME_SAVED_REGS \
- (sizeof (CORE_ADDR) * (NUM_REGS+NUM_PSEUDO_REGS))
+ (sizeof (CORE_ADDR) * (gdbarch_num_regs (current_gdbarch)\
+ + gdbarch_num_pseudo_regs (current_gdbarch)))
/* Allocate zero initialized memory from the frame cache obstack.
Appendices to the frame info (such as the unwind cache) should
extern void *frame_obstack_zalloc (unsigned long size);
#define FRAME_OBSTACK_ZALLOC(TYPE) ((TYPE *) frame_obstack_zalloc (sizeof (TYPE)))
+#define FRAME_OBSTACK_CALLOC(NUMBER,TYPE) ((TYPE *) frame_obstack_zalloc ((NUMBER) * sizeof (TYPE)))
-/* If FRAME_CHAIN_VALID returns zero it means that the given frame
- is the outermost one and has no caller. */
-
-extern int frame_chain_valid (CORE_ADDR, struct frame_info *);
-
-extern void generic_save_dummy_frame_tos (CORE_ADDR sp);
-
-
-#ifdef FRAME_FIND_SAVED_REGS
-/* XXX - deprecated */
-#define FRAME_INIT_SAVED_REGS(FI) deprecated_get_frame_saved_regs (FI, NULL)
-extern void deprecated_get_frame_saved_regs (struct frame_info *,
- struct frame_saved_regs *);
-#endif
+/* Create a regcache, and copy the frame's registers into it. */
+struct regcache *frame_save_as_regcache (struct frame_info *this_frame);
extern struct block *get_frame_block (struct frame_info *,
CORE_ADDR *addr_in_block);
Should it look at the most recently specified SAL? If the target
has no state, should this function try to extract a block from the
most recently selected SAL? That way `list foo' would give it some
- sort of reference point. Then again, perhaphs that would confuse
+ sort of reference point. Then again, perhaps that would confuse
things.
Calls to this function can be broken down into two categories: Code
The latter can be eliminated by correctly parameterizing the code,
the former though is more interesting. Per the "address" command,
- it occures in the CLI code and makes it possible for commands to
+ it occurs in the CLI code and makes it possible for commands to
work, even when the inferior has no state. */
extern struct block *get_selected_block (CORE_ADDR *addr_in_block);
extern struct symbol *get_frame_function (struct frame_info *);
-extern CORE_ADDR frame_address_in_block (struct frame_info *);
-
extern CORE_ADDR get_pc_function_start (CORE_ADDR);
-extern struct block *block_for_pc (CORE_ADDR);
-
-extern struct block *block_for_pc_sect (CORE_ADDR, asection *);
-
-extern int frameless_look_for_prologue (struct frame_info *);
-
-extern void print_frame_args (struct symbol *, struct frame_info *,
- int, struct ui_file *);
-
extern struct frame_info *find_relative_frame (struct frame_info *, int *);
-extern void show_and_print_stack_frame (struct frame_info *fi, int level,
- int source);
+extern void show_and_print_stack_frame (struct frame_info *fi, int print_level,
+ enum print_what print_what);
-extern void print_stack_frame (struct frame_info *, int, int);
+extern void print_stack_frame (struct frame_info *, int print_level,
+ enum print_what print_what);
extern void show_stack_frame (struct frame_info *);
-extern void print_frame_info (struct frame_info *, int, int, int);
-
-extern void show_frame_info (struct frame_info *, int, int, int);
+extern void print_frame_info (struct frame_info *, int print_level,
+ enum print_what print_what, int args);
extern struct frame_info *block_innermost_frame (struct block *);
-/* NOTE: cagney/2002-09-13: There is no need for this function.
- Instead either of frame_unwind_signed_register() or
- frame_unwind_unsigned_register() can be used. */
-extern CORE_ADDR deprecated_read_register_dummy (CORE_ADDR pc,
- CORE_ADDR fp, int);
-extern void generic_push_dummy_frame (void);
-extern void generic_pop_current_frame (void (*)(struct frame_info *));
-extern void generic_pop_dummy_frame (void);
-
-extern int generic_pc_in_call_dummy (CORE_ADDR pc,
- CORE_ADDR sp, CORE_ADDR fp);
-
-/* NOTE: cagney/2002-06-26: Targets should no longer use this
- function. Instead, the contents of a dummy frames registers can be
- obtained by applying: frame_register_unwind to the dummy frame; or
- get_saved_register to the next outer frame. */
-
-extern char *deprecated_generic_find_dummy_frame (CORE_ADDR pc, CORE_ADDR fp);
-
-extern void generic_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun,
- int nargs, struct value **args,
- struct type *type, int gcc_p);
-
-/* The function generic_get_saved_register() has been made obsolete.
- GET_SAVED_REGISTER now defaults to the recursive equivalent -
- generic_unwind_get_saved_register() - so there is no need to even
- set GET_SAVED_REGISTER. Architectures that need to override the
- register unwind mechanism should modify frame->unwind(). */
-extern void deprecated_generic_get_saved_register (char *, int *, CORE_ADDR *,
- struct frame_info *, int,
- enum lval_type *);
-
-extern void generic_save_call_dummy_addr (CORE_ADDR lo, CORE_ADDR hi);
-
-extern void get_saved_register (char *raw_buffer, int *optimized,
- CORE_ADDR * addrp,
- struct frame_info *frame,
- int regnum, enum lval_type *lval);
+extern int deprecated_pc_in_call_dummy (CORE_ADDR pc);
+
+/* FIXME: cagney/2003-02-02: Should be deprecated or replaced with a
+ function called get_frame_register_p(). This slightly weird (and
+ older) variant of get_frame_register() returns zero (indicating the
+ register is unavailable) if either: the register isn't cached; or
+ the register has been optimized out. Problem is, neither check is
+ exactly correct. A register can't be optimized out (it may not
+ have been saved as part of a function call); The fact that a
+ register isn't in the register cache doesn't mean that the register
+ isn't available (it could have been fetched from memory). */
extern int frame_register_read (struct frame_info *frame, int regnum,
- void *buf);
+ gdb_byte *buf);
/* From stack.c. */
extern void args_info (char *, int);
extern void locals_info (char *, int);
-extern void (*selected_frame_level_changed_hook) (int);
+extern void (*deprecated_selected_frame_level_changed_hook) (int);
extern void return_command (char *, int);
-/* NOTE: cagney/2002-11-27:
+/* Notes (cagney/2002-11-27, drow/2003-09-06):
- You might think that the below global can simply be replaced by a
- call to either get_selected_frame() or select_frame().
+ You might think that calls to this function can simply be replaced by a
+ call to get_selected_frame().
- Unfortunatly, it isn't that easy.
+ Unfortunately, it isn't that easy.
The relevant code needs to be audited to determine if it is
- possible (or pratical) to instead pass the applicable frame in as a
+ possible (or practical) to instead pass the applicable frame in as a
parameter. For instance, DEPRECATED_DO_REGISTERS_INFO() relied on
the deprecated_selected_frame global, while its replacement,
PRINT_REGISTERS_INFO(), is parameterized with the selected frame.
- The only real exceptions occure at the edge (in the CLI code) where
+ The only real exceptions occur at the edge (in the CLI code) where
user commands need to pick up the selected frame before proceeding.
+ There are also some functions called with a NULL frame meaning either "the
+ program is not running" or "use the selected frame".
+
This is important. GDB is trying to stamp out the hack:
- saved_frame = deprecated_selected_frame;
- deprecated_selected_frame = ...;
+ saved_frame = deprecated_safe_get_selected_frame ();
+ select_frame (...);
hack_using_global_selected_frame ();
- deprecated_selected_frame = saved_frame;
+ select_frame (saved_frame);
- Take care! */
+ Take care!
-extern struct frame_info *deprecated_selected_frame;
+ This function calls get_selected_frame if the inferior should have a
+ frame, or returns NULL otherwise. */
+extern struct frame_info *deprecated_safe_get_selected_frame (void);
/* Create a frame using the specified BASE and PC. */
extern struct frame_info *create_new_frame (CORE_ADDR base, CORE_ADDR pc);
-
-/* Create/access the frame's `extra info'. The extra info is used by
- older code to store information such as the analyzed prologue. The
- zalloc() should only be called by the INIT_EXTRA_INFO method. */
-
-extern struct frame_extra_info *frame_extra_info_zalloc (struct frame_info *fi,
- long size);
-extern struct frame_extra_info *get_frame_extra_info (struct frame_info *fi);
-
-/* Create/access the frame's `saved_regs'. The saved regs are used by
- older code to store the address of each register (except for
- SP_REGNUM where the value of the register in the previous frame is
- stored). */
-extern CORE_ADDR *frame_saved_regs_zalloc (struct frame_info *);
-extern CORE_ADDR *get_frame_saved_regs (struct frame_info *);
-
/* FIXME: cagney/2002-12-06: Has the PC in the current frame changed?
- "infrun.c", Thanks to DECR_PC_AFTER_BREAK, can change the PC after
- the initial frame create. This puts things back in sync. */
+ "infrun.c", Thanks to gdbarch_decr_pc_after_break, can change the PC after
+ the initial frame create. This puts things back in sync.
+
+ This replaced: frame->pc = ....; */
extern void deprecated_update_frame_pc_hack (struct frame_info *frame,
CORE_ADDR pc);
/* FIXME: cagney/2002-12-18: Has the frame's base changed? Or to be
- more exact, whas that initial guess at the frame's base as returned
- by read_fp() wrong. If it was, fix it. This shouldn't be
- necessary since the code should be getting the frame's base correct
- from the outset. */
+ more exact, was that initial guess at the frame's base as returned
+ by the deleted read_fp() wrong? If it was, fix it. This shouldn't
+ be necessary since the code should be getting the frame's base
+ correct from the outset.
+
+ This replaced: frame->frame = ....; */
extern void deprecated_update_frame_base_hack (struct frame_info *frame,
CORE_ADDR base);
-/* FIXME: cagney/2003-01-04: Explicitly set the frame's saved_regs
- and/or extra_info. Target code is allocating a fake frame and than
- initializing that to get around the problem of, when creating the
- inner most frame, there is no where to cache information such as
- the prologue analysis. This is fixed by the new unwind mechanism -
- even the inner most frame has somewhere to store things like the
- prolog analysis (or at least will once the frame overhaul is
- finished). */
-extern void deprecated_set_frame_saved_regs_hack (struct frame_info *frame,
- CORE_ADDR *saved_regs);
-extern void deprecated_set_frame_extra_info_hack (struct frame_info *frame,
- struct frame_extra_info *extra_info);
-
-/* FIXME: cagney/2003-01-04: Allocate a frame from the heap (rather
- than the frame obstack). Targets do this as a way of saving the
- prologue analysis from the inner most frame before that frame has
- been created. By always creating a frame, this problem goes away. */
-extern struct frame_info *deprecated_frame_xmalloc (void);
-
-/* FIXME: cagney/2003-01-05: Allocate a frame, along with the
- saved_regs and extra_info. Set up cleanups for all three. Same as
- for deprecated_frame_xmalloc, targets are calling this when
- creating a scratch `struct frame_info'. The frame overhaul makes
- this unnecessary since all frame queries are parameterized with a
- common cache parameter and a frame. */
-extern struct frame_info *deprecated_frame_xmalloc_with_cleanup (long sizeof_saved_regs,
- long sizeof_extra_info);
-
-/* FIXME: cagney/2003-01-07: These are just nasty. Code shouldn't be
- doing this. I suspect it dates back to the days when every field
- of an allocated structure was explicitly initialized. */
-extern void deprecated_set_frame_next_hack (struct frame_info *fi,
- struct frame_info *next);
-extern void deprecated_set_frame_prev_hack (struct frame_info *fi,
- struct frame_info *prev);
-
-/* FIXME: cagney/2003-01-07: Instead of the dwarf2cfi having its own
- dedicated `struct frame_info . context' field, the code should use
- the per frame `unwind_cache' that is passed to the
- frame_pc_unwind(), frame_register_unwind() and frame_id_unwind()
- methods.
-
- See "dummy-frame.c" for an example of how a cfi-frame object can be
- implemented using this. */
-extern struct context *deprecated_get_frame_context (struct frame_info *fi);
-extern void deprecated_set_frame_context (struct frame_info *fi,
- struct context *context);
-
#endif /* !defined (FRAME_H) */