X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fframe-unwind.h;h=0dc9edc72b6d46f91e5363d3724de5a21fbf272f;hb=bba960fc4b3f330ec75ef7d3581aaaed4c560c49;hp=ad1efdf353b3d548f44d4e8e44d1de3d95fc2f2c;hpb=7df05f2b91d56bb6305625b73f0180187f4d66ff;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/frame-unwind.h b/gdb/frame-unwind.h index ad1efdf353..0dc9edc72b 100644 --- a/gdb/frame-unwind.h +++ b/gdb/frame-unwind.h @@ -1,12 +1,12 @@ /* Definitions for a frame unwinder, for GDB, the GNU debugger. - Copyright 2003 Free Software Foundation, Inc. + Copyright (C) 2003-2016 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, @@ -15,44 +15,25 @@ 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 . */ #if !defined (FRAME_UNWIND_H) #define FRAME_UNWIND_H 1 +struct frame_data; struct frame_info; struct frame_id; struct frame_unwind; struct gdbarch; struct regcache; +struct value; #include "frame.h" /* For enum frame_type. */ -/* Return the frame unwind methods for the function that contains PC, - or NULL if this this unwinder can't handle this frame. */ - -typedef const struct frame_unwind *(frame_unwind_p_ftype) (CORE_ADDR pc); - -/* Add a frame unwinder to the list. The predicates are polled in the - order that they are appended. The initial list contains the dummy - frame's predicate. */ - -extern void frame_unwind_append_predicate (struct gdbarch *gdbarch, - frame_unwind_p_ftype *p); - -/* Iterate through the list of frame unwinders until one returns an - implementation. */ - -extern const struct frame_unwind *frame_unwind_find_by_pc (struct gdbarch - *gdbarch, - CORE_ADDR pc); - /* The following unwind functions assume a chain of frames forming the sequence: (outer) prev <-> this <-> next (inner). All the - functions are called with called with the next frame's `struct - frame_info' and and this frame's prologue cache. + functions are called with this frame's `struct frame_info' and + prologue cache. THIS frame's register values can be obtained by unwinding NEXT frame's registers (a recursive operation). @@ -61,9 +42,36 @@ extern const struct frame_unwind *frame_unwind_find_by_pc (struct gdbarch as where this frame's prologue stores the previous frame's registers. */ +/* Given THIS frame, take a whiff of its registers (namely + the PC and attributes) and if SELF is the applicable unwinder, + return non-zero. Possibly also initialize THIS_PROLOGUE_CACHE; but + only if returning 1. Initializing THIS_PROLOGUE_CACHE in other + cases (0 return, or exception) is invalid. */ + +typedef int (frame_sniffer_ftype) (const struct frame_unwind *self, + struct frame_info *this_frame, + void **this_prologue_cache); + +typedef enum unwind_stop_reason (frame_unwind_stop_reason_ftype) + (struct frame_info *this_frame, void **this_prologue_cache); + +/* A default frame sniffer which always accepts the frame. Used by + fallback prologue unwinders. */ + +int default_frame_sniffer (const struct frame_unwind *self, + struct frame_info *this_frame, + void **this_prologue_cache); + +/* A default stop_reason callback which always claims the frame is + unwindable. */ + +enum unwind_stop_reason + default_frame_unwind_stop_reason (struct frame_info *this_frame, + void **this_cache); + /* Assuming the frame chain: (outer) prev <-> this <-> next (inner); - use the NEXT frame, and its register unwind method, to determine - the frame ID of THIS frame. + use THIS frame, and through it the NEXT frame's register unwind + method, to determine the frame ID of THIS frame. A frame ID provides an invariant that can be used to re-identify an instance of a frame. It is a combination of the frame's `base' and @@ -82,16 +90,16 @@ extern const struct frame_unwind *frame_unwind_find_by_pc (struct gdbarch THIS_PROLOGUE_CACHE can be used to share any prolog analysis data with the other unwind methods. Memory for that cache should be - allocated using frame_obstack_zalloc(). */ + allocated using FRAME_OBSTACK_ZALLOC(). */ -typedef void (frame_this_id_ftype) (struct frame_info *next_frame, +typedef void (frame_this_id_ftype) (struct frame_info *this_frame, void **this_prologue_cache, struct frame_id *this_id); /* Assuming the frame chain: (outer) prev <-> this <-> next (inner); - use the NEXT frame, and its register unwind method, to unwind THIS - frame's registers (returning the value of the specified register - REGNUM in the previous frame). + use THIS frame, and implicitly the NEXT frame's register unwind + method, to unwind THIS frame's registers (returning the value of + the specified register REGNUM in the previous frame). Traditionally, THIS frame's registers were unwound by examining THIS frame's function's prologue and identifying which registers @@ -103,30 +111,34 @@ typedef void (frame_this_id_ftype) (struct frame_info *next_frame, register in the previous frame is found in memory at SP+12, and THIS frame's SP can be obtained by unwinding the NEXT frame's SP. - Why not pass in THIS_FRAME? By passing in NEXT frame and THIS - cache, the supplied parameters are consistent with the sibling - function THIS_ID. + This function takes THIS_FRAME as an argument. It can find the + values of registers in THIS frame by calling get_frame_register + (THIS_FRAME), and reinvoke itself to find other registers in the + PREVIOUS frame by calling frame_unwind_register (THIS_FRAME). - Can the code call ``frame_register (get_prev_frame (NEXT_FRAME))''? - Won't the call frame_register (THIS_FRAME) be faster? Well, - ignoring the possability that the previous frame does not yet - exist, the ``frame_register (FRAME)'' function is expanded to - ``frame_register_unwind (get_next_frame (FRAME)'' and hence that - call will expand to ``frame_register_unwind (get_next_frame - (get_prev_frame (NEXT_FRAME)))''. Might as well call - ``frame_register_unwind (NEXT_FRAME)'' directly. + The result is a GDB value object describing the register value. It + may be a lazy reference to memory, a lazy reference to the value of + a register in THIS frame, or a non-lvalue. THIS_PROLOGUE_CACHE can be used to share any prolog analysis data with the other unwind methods. Memory for that cache should be - allocated using frame_obstack_zalloc(). */ + allocated using FRAME_OBSTACK_ZALLOC(). */ + +typedef struct value * (frame_prev_register_ftype) + (struct frame_info *this_frame, void **this_prologue_cache, + int regnum); + +/* Deallocate extra memory associated with the frame cache if any. */ + +typedef void (frame_dealloc_cache_ftype) (struct frame_info *self, + void *this_cache); + +/* Assuming the frame chain: (outer) prev <-> this <-> next (inner); + use THIS frame, and implicitly the NEXT frame's register unwind + method, return PREV frame's architecture. */ -typedef void (frame_prev_register_ftype) (struct frame_info *next_frame, - void **this_prologue_cache, - int prev_regnum, - int *optimized, - enum lval_type * lvalp, - CORE_ADDR *addrp, - int *realnump, void *valuep); +typedef struct gdbarch *(frame_prev_arch_ftype) (struct frame_info *this_frame, + void **this_prologue_cache); struct frame_unwind { @@ -135,8 +147,76 @@ struct frame_unwind enum frame_type type; /* Should an attribute indicating the frame's address-in-block go here? */ + frame_unwind_stop_reason_ftype *stop_reason; frame_this_id_ftype *this_id; frame_prev_register_ftype *prev_register; + const struct frame_data *unwind_data; + frame_sniffer_ftype *sniffer; + frame_dealloc_cache_ftype *dealloc_cache; + frame_prev_arch_ftype *prev_arch; }; +/* Register a frame unwinder, _prepending_ it to the front of the + search list (so it is sniffed before previously registered + unwinders). By using a prepend, later calls can install unwinders + that override earlier calls. This allows, for instance, an OSABI + to install a more specific sigtramp unwinder that overrides the + traditional brute-force unwinder. */ +extern void frame_unwind_prepend_unwinder (struct gdbarch *, + const struct frame_unwind *); + +/* Add a frame sniffer to the list. The predicates are polled in the + order that they are appended. The initial list contains the dummy + frame sniffer. */ + +extern void frame_unwind_append_unwinder (struct gdbarch *gdbarch, + const struct frame_unwind *unwinder); + +/* Iterate through sniffers for THIS_FRAME frame until one returns with an + unwinder implementation. THIS_FRAME->UNWIND must be NULL, it will get set + by this function. Possibly initialize THIS_CACHE. */ + +extern void frame_unwind_find_by_frame (struct frame_info *this_frame, + void **this_cache); + +/* Helper functions for value-based register unwinding. These return + a (possibly lazy) value of the appropriate type. */ + +/* Return a value which indicates that FRAME did not save REGNUM. */ + +struct value *frame_unwind_got_optimized (struct frame_info *frame, + int regnum); + +/* Return a value which indicates that FRAME copied REGNUM into + register NEW_REGNUM. */ + +struct value *frame_unwind_got_register (struct frame_info *frame, int regnum, + int new_regnum); + +/* Return a value which indicates that FRAME saved REGNUM in memory at + ADDR. */ + +struct value *frame_unwind_got_memory (struct frame_info *frame, int regnum, + CORE_ADDR addr); + +/* Return a value which indicates that FRAME's saved version of + REGNUM has a known constant (computed) value of VAL. */ + +struct value *frame_unwind_got_constant (struct frame_info *frame, int regnum, + ULONGEST val); + +/* Return a value which indicates that FRAME's saved version of + REGNUM has a known constant (computed) value which is stored + inside BUF. */ + +struct value *frame_unwind_got_bytes (struct frame_info *frame, int regnum, + gdb_byte *buf); + +/* Return a value which indicates that FRAME's saved version of REGNUM + has a known constant (computed) value of ADDR. Convert the + CORE_ADDR to a target address if necessary. */ + +struct value *frame_unwind_got_address (struct frame_info *frame, int regnum, + CORE_ADDR addr); + #endif