/* 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
+ Free Software Foundation, Inc.
This file is part of GDB.
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. */
+ Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
#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;
struct frame_base;
struct block;
-
-/* A legacy unwinder to prop up architectures using the old style
- saved regs array. */
-extern const struct frame_unwind *legacy_saved_regs_unwind;
+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). */
above about frameless functions. */
extern int frame_id_inner (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);
+/* 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
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). */
+ 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 address of the first
- local variable, or 0 if the information isn't available. NOTE:
+/* 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 address of the first
- parameter, 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
+/* 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 *);
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 DEPRECATED_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);
-/* 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. */
+/* 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. */
extern void frame_unwind_register (struct frame_info *frame,
- int regnum, void *buf);
+ int regnum, gdb_byte *buf);
+extern void get_frame_register (struct frame_info *frame,
+ int regnum, gdb_byte *buf);
+
+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_signed_register (struct frame_info *frame,
- int regnum, LONGEST *val);
+/* Use frame_unwind_register_signed. */
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_register (struct frame_info *frame, int regnum,
- void *buf);
-
-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. If NAMELEN is negative, use the NAME's
length when doing the comparison. */
-extern int frame_map_name_to_regnum (const char *name, int namelen);
-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
of the caller. */
extern void frame_pop (struct frame_info *frame);
-/* Describe the saved registers of a frame. */
+/* 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.
-#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.
+ If the memory read fails, these methods throw an error.
- regs[SP_REGNUM] is different. It holds the actual SP, not the
- address at which it was saved. */
+ 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. */
- CORE_ADDR regs[NUM_REGS];
- };
-#endif
+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);
-/* 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 DEPRECATED_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
+/* 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);
- /* 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 DEPRECATED_INIT_EXTRA_FRAME_INFO */
- struct frame_extra_info *extra_info;
-
- /* If dwarf2 unwind frame informations is used, this structure holds all
- related unwind data. */
- struct context *context;
-
- /* The frame's low-level unwinder and corresponding cache. The
- low-level unwinder is responsible for unwinding register values
- for the previous frame. The low-level unwind methods are
- selected based on the presence, or otherwize, of register
- unwind information such as CFI. */
- void *prologue_cache;
- const struct frame_unwind *unwind;
-
- /* Cached copy of the previous frame's resume address. */
- int pc_unwind_cache_p;
- CORE_ADDR pc_unwind_cache;
-
- /* This frame's ID. Note that the frame's ID, base and PC contain
- redundant information. */
- int id_p;
- struct frame_id id;
-
- /* The frame's high-level base methods, and corresponding cache.
- The high level base methods are selected based on the frame's
- debug info. */
- const struct frame_base *base;
- void *base_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 */
- };
+/* Return this frame's architecture. */
+
+extern struct gdbarch *get_frame_arch (struct frame_info *this_frame);
-/* 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 DEPRECATED_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 DEPRECATED_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 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
- frame_register_unwind() to the next outer frame. */
-
-extern char *deprecated_generic_find_dummy_frame (CORE_ADDR pc, CORE_ADDR fp);
-
-void generic_unwind_get_saved_register (char *raw_buffer,
- int *optimizedp,
- CORE_ADDR *addrp,
- struct frame_info *frame,
- int regnum,
- enum lval_type *lvalp);
-
-/* The function generic_get_saved_register() has been made obsolete.
- DEPRECATED_GET_SAVED_REGISTER now defaults to the recursive
- equivalent - generic_unwind_get_saved_register() - so there is no
- need to even set DEPRECATED_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 int deprecated_pc_in_call_dummy (CORE_ADDR pc);
/* FIXME: cagney/2003-02-02: Should be deprecated or replaced with a
- function called frame_read_register_p(). This slightly weird (and
- older) variant of frame_read_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
+ 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);
-
-/* Return non-zero if the architecture is relying on legacy frame
- code. */
-extern int legacy_frame_p (struct gdbarch *gdbarch);
-
#endif /* !defined (FRAME_H) */
projects / deliverable / binutils-gdb.git / blobdiff