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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [unwind-dw2-fde.h] - Blame information for rev 280

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1 280 jeremybenn
/* Subroutines needed for unwinding stack frames for exception handling.  */
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/* Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2004, 2009
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   Free Software Foundation, Inc.
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   Contributed by Jason Merrill <jason@cygnus.com>.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
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<http://www.gnu.org/licenses/>.  */
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#ifndef GCC_UNWIND_DW2_FDE_H
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#define GCC_UNWIND_DW2_FDE_H
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#ifndef HIDE_EXPORTS
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#pragma GCC visibility push(default)
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#endif
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struct fde_vector
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{
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  const void *orig_data;
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  size_t count;
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  const struct dwarf_fde *array[];
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};
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struct object
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{
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  void *pc_begin;
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  void *tbase;
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  void *dbase;
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  union {
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    const struct dwarf_fde *single;
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    struct dwarf_fde **array;
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    struct fde_vector *sort;
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  } u;
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  union {
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    struct {
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      unsigned long sorted : 1;
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      unsigned long from_array : 1;
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      unsigned long mixed_encoding : 1;
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      unsigned long encoding : 8;
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      /* ??? Wish there was an easy way to detect a 64-bit host here;
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         we've got 32 bits left to play with...  */
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      unsigned long count : 21;
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    } b;
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    size_t i;
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  } s;
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#ifdef DWARF2_OBJECT_END_PTR_EXTENSION
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  char *fde_end;
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#endif
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  struct object *next;
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};
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/* This is the original definition of struct object.  While the struct
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   itself was opaque to users, they did know how large it was, and
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   allocate one statically in crtbegin for each DSO.  Keep this around
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   so that we're aware of the static size limitations for the new struct.  */
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struct old_object
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{
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  void *pc_begin;
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  void *pc_end;
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  struct dwarf_fde *fde_begin;
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  struct dwarf_fde **fde_array;
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  size_t count;
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  struct old_object *next;
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};
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struct dwarf_eh_bases
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{
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  void *tbase;
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  void *dbase;
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  void *func;
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};
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extern void __register_frame_info_bases (const void *, struct object *,
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                                         void *, void *);
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extern void __register_frame_info (const void *, struct object *);
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extern void __register_frame (void *);
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extern void __register_frame_info_table_bases (void *, struct object *,
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                                               void *, void *);
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extern void __register_frame_info_table (void *, struct object *);
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extern void __register_frame_table (void *);
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extern void *__deregister_frame_info (const void *);
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extern void *__deregister_frame_info_bases (const void *);
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extern void __deregister_frame (void *);
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typedef          int  sword __attribute__ ((mode (SI)));
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typedef unsigned int  uword __attribute__ ((mode (SI)));
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typedef unsigned int  uaddr __attribute__ ((mode (pointer)));
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typedef          int  saddr __attribute__ ((mode (pointer)));
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typedef unsigned char ubyte;
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/* Terminology:
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   CIE - Common Information Element
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   FDE - Frame Descriptor Element
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   There is one per function, and it describes where the function code
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   is located, and what the register lifetimes and stack layout are
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   within the function.
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   The data structures are defined in the DWARF specification, although
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   not in a very readable way (see LITERATURE).
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   Every time an exception is thrown, the code needs to locate the FDE
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   for the current function, and starts to look for exception regions
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   from that FDE. This works in a two-level search:
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   a) in a linear search, find the shared image (i.e. DLL) containing
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      the PC
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   b) using the FDE table for that shared object, locate the FDE using
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      binary search (which requires the sorting).  */
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/* The first few fields of a CIE.  The CIE_id field is 0 for a CIE,
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   to distinguish it from a valid FDE.  FDEs are aligned to an addressing
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   unit boundary, but the fields within are unaligned.  */
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struct dwarf_cie
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{
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  uword length;
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  sword CIE_id;
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  ubyte version;
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  unsigned char augmentation[];
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} __attribute__ ((packed, aligned (__alignof__ (void *))));
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/* The first few fields of an FDE.  */
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struct dwarf_fde
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{
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  uword length;
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  sword CIE_delta;
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  unsigned char pc_begin[];
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} __attribute__ ((packed, aligned (__alignof__ (void *))));
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typedef struct dwarf_fde fde;
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/* Locate the CIE for a given FDE.  */
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static inline const struct dwarf_cie *
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get_cie (const struct dwarf_fde *f)
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{
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  return (const void *)&f->CIE_delta - f->CIE_delta;
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}
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static inline const fde *
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next_fde (const fde *f)
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{
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  return (const fde *) ((const char *) f + f->length + sizeof (f->length));
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}
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extern const fde * _Unwind_Find_FDE (void *, struct dwarf_eh_bases *);
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static inline int
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last_fde (struct object *obj __attribute__ ((__unused__)), const fde *f)
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{
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#ifdef DWARF2_OBJECT_END_PTR_EXTENSION
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  return (char *)f == obj->fde_end || f->length == 0;
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#else
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  return f->length == 0;
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#endif
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}
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#ifndef HIDE_EXPORTS
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#pragma GCC visibility pop
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#endif
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#endif /* unwind-dw2-fde.h */

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