/* 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 Free Software Foundation, Inc.
+ 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of GDB.
#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 if the fetch
+ succeeds. Return a freshly allocated error message?
+
+ 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;
+struct gdbarch;
+struct ui_file;
+
+/* A legacy unwinder to prop up architectures using the old style
+ saved regs array. */
+extern const struct frame_unwind *legacy_saved_regs_unwind;
+
/* The frame object. */
struct frame_info;
/* The frame object's ID. This provides a per-frame unique identifier
that can be used to relocate a `struct frame_info' after a target
- resume or a frame cache destruct (assuming the target hasn't
- unwound the stack past that frame - a problem handled elsewhere). */
+ resume or a frame cache destruct. It of course assumes that the
+ inferior hasn't unwound the stack past that frame. */
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. */
+ 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(). */
+ 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().
+ A zero in this field will be treated as a wild-card when comparing
+ frames for equality. */
+ CORE_ADDR special_addr;
};
+/* Methods for constructing and comparing Frame IDs.
+
+ 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 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 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) (or zero,
+ to indicate a wild card). The special identifier address is
+ defaulted to zero. */
+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) (or zero,
+ to indicate a wild card), and the third parameter is the frame's
+ special identifier address (or zero to indicate a wild card or
+ unused default). */
+extern struct frame_id frame_id_build_special (CORE_ADDR stack_addr,
+ CORE_ADDR code_addr,
+ CORE_ADDR special_addr);
+
+/* Returns non-zero when L is a valid frame (a valid frame has a
+ non-zero .base). */
+extern int frame_id_p (struct frame_id l);
+
+/* Returns non-zero when L and R identify the same frame, or, if
+ either L or R have a zero .func, then the same frame base. */
+extern int frame_id_eq (struct frame_id l, struct frame_id r);
+
+/* 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);
+
+/* 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);
+
+
/* For every stopped thread, GDB tracks two frames: current and
selected. Current frame is the inner most frame of the selected
thread. Selected frame is the one being examined by the the GDB
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). There should instead be a get_selected_frame()
- method that reinit's the frame cache on-demand. 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). */
+ 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);
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. */
+/* 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);
+
/* Select a specific frame. NULL, apparently implies re-select the
inner most frame. */
extern void select_frame (struct frame_info *);
/* 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 *);
-/* 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 (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 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 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, 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. */
+/* An address (not necessarily alligned 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);
+extern CORE_ADDR frame_unwind_address_in_block (struct frame_info *next_frame);
+
+/* 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 frame_func_unwind (struct frame_info *fi);
+extern CORE_ADDR get_frame_func (struct frame_info *fi);
+
+/* 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).
+
+ 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
+ in the single step code, and that code causes the frame cache to be
+ constantly flushed, caching things in a frame is probably of little
+ benefit. As they say `show us the numbers'.
+
+ NOTE: cagney/2002-11-28: Plenty more where this one came from:
+ find_frame_block(), find_frame_partial_function(),
+ find_frame_symtab(), find_frame_function(). Each will need to be
+ carefully considered to determine if the real intent was for it to
+ apply to the PC or the adjusted PC. */
+extern void find_frame_sal (struct frame_info *frame,
+ struct symtab_and_line *sal);
+
+/* 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). */
-extern void get_frame_id (struct frame_info *fi, struct frame_id *id);
+ frame after a frame cache flush (and other similar operations). If
+ FI is NULL, return the null_frame_id. */
+extern struct frame_id get_frame_id (struct frame_info *fi);
+
+/* 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). */
+ trampolines, and some are completely artificial (dummy). */
enum frame_type
{
+ /* The frame's type hasn't yet been defined. This is a catch-all
+ for legacy code that uses really strange technicques, such as
+ deprecated_set_frame_type, to set the frame's type. New code
+ should not use this value. */
+ UNKNOWN_FRAME,
/* A true stack frame, created by the target program during normal
execution. */
NORMAL_FRAME,
/* 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 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. */
+ 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);
CORE_ADDR *addrp, int *realnump,
void *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_signed_register (struct frame_info *frame,
- int regnum, LONGEST *val);
+extern void frame_unwind_register (struct frame_info *frame,
+ int regnum, void *buf);
+extern void get_frame_register (struct frame_info *frame,
+ int regnum, void *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);
+
+
+/* Use frame_unwind_register_signed. */
extern void frame_unwind_unsigned_register (struct frame_info *frame,
int regnum, ULONGEST *val);
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);
+/* 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 void *buf);
/* 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);
-\f
-/* Return the location (and possibly value) of REGNUM for the previous
- (older, up) frame. All parameters except VALUEP can be assumed to
- be non NULL. When VALUEP is NULL, just the location of the
- register should be returned.
-
- UNWIND_CACHE is provided as mechanism for implementing a per-frame
- local cache. It's initial value being NULL. Memory for that cache
- should be allocated using frame_obstack_alloc().
-
- Register window architectures (eg SPARC) should note that REGNUM
- identifies the register for the previous frame. For instance, a
- request for the value of "o1" for the previous frame would be found
- in the register "i1" in this FRAME. */
-
-typedef void (frame_register_unwind_ftype) (struct frame_info *frame,
- void **unwind_cache,
- int regnum,
- int *optimized,
- enum lval_type *lvalp,
- CORE_ADDR *addrp,
- int *realnump,
- void *valuep);
-
-/* Same as for registers above, but return the address at which the
- calling frame would resume. */
-
-typedef CORE_ADDR (frame_pc_unwind_ftype) (struct frame_info *frame,
- void **unwind_cache);
-
-/* 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. */
-
- CORE_ADDR regs[NUM_REGS];
- };
-#endif
+/* Discard the specified frame. Restoring the registers to the state
+ of the caller. */
+extern void frame_pop (struct frame_info *frame);
-/* 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
+/* 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 the memory read fails, these methods throw an error.
+
+ 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. */
+
+extern void get_frame_memory (struct frame_info *this_frame, CORE_ADDR addr,
+ void *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);
+
+/* Return this frame's architecture. */
+
+extern struct gdbarch *get_frame_arch (struct frame_info *this_frame);
- /* 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;
-
- /* If dwarf2 unwind frame informations is used, this structure holds all
- related unwind data. */
- struct context *context;
-
- /* Unwind cache shared between the unwind functions - they had
- better all agree as to the contents. */
- void *unwind_cache;
-
- /* See description above. The previous frame's registers. */
- frame_register_unwind_ftype *register_unwind;
-
- /* See description above. The previous frame's resume address.
- Save the previous PC in a local cache. */
- frame_pc_unwind_ftype *pc_unwind;
- int pc_unwind_cache_p;
- CORE_ADDR pc_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(). */
enum print_what
#define SIZEOF_FRAME_SAVED_REGS \
(sizeof (CORE_ADDR) * (NUM_REGS+NUM_PSEUDO_REGS))
-extern void *frame_obstack_alloc (unsigned long size);
-extern void frame_saved_regs_zalloc (struct frame_info *);
-
-/* 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.
+/* Allocate zero initialized memory from the frame cache obstack.
+ Appendices to the frame info (such as the unwind cache) should
+ allocate memory using this method. */
- XXXX - both default and alternate frame_chain_valid functions are
- deprecated. New code should use dummy frames and one of the
- generic functions. */
-
-extern int file_frame_chain_valid (CORE_ADDR, struct frame_info *);
-extern int func_frame_chain_valid (CORE_ADDR, struct frame_info *);
-extern int nonnull_frame_chain_valid (CORE_ADDR, struct frame_info *);
-extern int generic_file_frame_chain_valid (CORE_ADDR, struct frame_info *);
-extern int generic_func_frame_chain_valid (CORE_ADDR, struct frame_info *);
-extern void generic_save_dummy_frame_tos (CORE_ADDR sp);
+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 legacy_frame_chain_valid() returns zero it means that the given
+ frame is the outermost one and has no caller.
+ This method has been superseeded by the per-architecture
+ frame_unwind_pc() (returns 0 to indicate an invalid return address)
+ and per-frame this_id() (returns a NULL frame ID to indicate an
+ invalid frame). */
+extern int legacy_frame_chain_valid (CORE_ADDR, struct frame_info *);
-#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 (struct frame_info *,
- struct frame_saved_regs *);
-#endif
+extern void generic_save_dummy_frame_tos (CORE_ADDR sp);
extern struct block *get_frame_block (struct frame_info *,
CORE_ADDR *addr_in_block);
-extern struct block *get_current_block (CORE_ADDR *addr_in_block);
+/* Return the `struct block' that belongs to the selected thread's
+ selected frame. If the inferior has no state, return NULL.
-extern struct block *get_selected_block (CORE_ADDR *addr_in_block);
+ NOTE: cagney/2002-11-29:
-extern struct symbol *get_frame_function (struct frame_info *);
+ No state? Does the inferior have any execution state (a core file
+ does, an executable does not). At present the code tests
+ `target_has_stack' but I'm left wondering if it should test
+ `target_has_registers' or, even, a merged target_has_state.
-extern CORE_ADDR frame_address_in_block (struct frame_info *);
+ 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
+ things.
-extern CORE_ADDR get_pc_function_start (CORE_ADDR);
+ Calls to this function can be broken down into two categories: Code
+ that uses the selected block as an additional, but optional, data
+ point; Code that uses the selected block as a prop, when it should
+ have the relevant frame/block/pc explicitly passed in.
-extern struct block *block_for_pc (CORE_ADDR);
+ 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
+ work, even when the inferior has no state. */
-extern struct block *block_for_pc_sect (CORE_ADDR, asection *);
+extern struct block *get_selected_block (CORE_ADDR *addr_in_block);
+
+extern struct symbol *get_frame_function (struct frame_info *);
-extern int frameless_look_for_prologue (struct frame_info *);
+extern CORE_ADDR get_pc_function_start (CORE_ADDR);
-extern void print_frame_args (struct symbol *, struct frame_info *,
- int, struct ui_file *);
+extern int legacy_frameless_look_for_prologue (struct frame_info *);
extern struct frame_info *find_relative_frame (struct frame_info *, int *);
extern void print_stack_frame (struct frame_info *, int, int);
-extern void print_only_stack_frame (struct frame_info *, int, int);
-
extern void show_stack_frame (struct frame_info *);
extern void print_frame_info (struct frame_info *, int, int, int);
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. */
+/* NOTE: cagney/2002-09-13: There is no need for this function. */
extern CORE_ADDR deprecated_read_register_dummy (CORE_ADDR pc,
CORE_ADDR fp, int);
extern void generic_push_dummy_frame (void);
/* 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. */
+ frame_register_unwind() 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(). */
+/* The DEPRECATED_GET_SAVED_REGISTER architecture interface is
+ entirely redundant. New architectures should implement per-frame
+ unwinders (ref "frame-unwind.h"). */
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);
+/* 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);
You might think that the below global can simply be replaced by a
call to either get_selected_frame() or select_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
parameter. For instance, DEPRECATED_DO_REGISTERS_INFO() relied on
- the selected_frame global, but its replacement,
+ 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
user commands need to pick up the selected frame before proceeding.
This is important. GDB is trying to stamp out the hack:
- saved_frame = selected_frame;
- selected_frame = ...;
+ saved_frame = deprecated_selected_frame;
+ deprecated_selected_frame = ...;
hack_using_global_selected_frame ();
- selected_frame = saved_frame;
+ deprecated_selected_frame = saved_frame;
Take care! */
-extern struct frame_info *selected_frame;
+extern struct frame_info *deprecated_selected_frame;
+
+/* NOTE: drow/2003-09-06:
+
+ This function is "a step sideways" for uses of deprecated_selected_frame.
+ They should be fixed as above, but meanwhile, we needed a solution for
+ cases where functions are called with a NULL frame meaning either "the
+ program is not running" or "use the selected frame". Lazy building of
+ deprecated_selected_frame confuses the situation, because now
+ deprecated_selected_frame can be NULL even when the inferior is running.
+
+ 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 *deprecated_get_frame_saved_regs (struct frame_info *);
-/* NOTE: cagney/2002-11-28:
+/* 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.
- These functions are used to explicitly create and set the inner
- most (current) frame vis:
+ This replaced: frame->pc = ....; */
+extern void deprecated_update_frame_pc_hack (struct frame_info *frame,
+ CORE_ADDR pc);
- set_current_frame (create_new_frame (read_fp(), stop_pc)));
+/* FIXME: cagney/2002-12-18: Has the frame's base changed? Or to be
+ more exact, was that initial guess at the frame's base as returned
+ by deprecated_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.
- Such code should be removed. Instead that task can be left to
- get_current_frame() which will update things on-demand.
+ This replaced: frame->frame = ....; */
+extern void deprecated_update_frame_base_hack (struct frame_info *frame,
+ CORE_ADDR base);
- The only vague exception is found in "infcmd.c" (and a few
- architectures specific files) as part of the code implementing the
- command ``(gdb) frame FRAME PC''. There, the frame should be
- created/selected in a single shot. */
+/* 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);
-extern void set_current_frame (struct frame_info *);
-extern struct frame_info *create_new_frame (CORE_ADDR, CORE_ADDR);
+/* Return non-zero if the architecture is relying on legacy frame
+ code. */
+extern int legacy_frame_p (struct gdbarch *gdbarch);
#endif /* !defined (FRAME_H) */
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