gcc/frame.h

   1 /* Copyright (C) 1997 Free Software Foundation, Inc.
   2    This file is part of GNU CC.  */
   3
   4 typedef struct frame_state
   5 {
   6   void *cfa;
   7   void *eh_ptr;
   8   long cfa_offset;
   9   long args_size;
  10   long reg_or_offset[FIRST_PSEUDO_REGISTER+1];
  11   unsigned short cfa_reg;
  12   unsigned short retaddr_column;
  13   char saved[FIRST_PSEUDO_REGISTER+1];
  14 } frame_state;
  15
  16 /* Values for 'saved' above.  */
  17 #define REG_UNSAVED 0
  18 #define REG_SAVED_OFFSET 1
  19 #define REG_SAVED_REG 2
  20
  21 /* The representation for an "object" to be searched for frame unwind info.
  22    For targets with named sections, one object is an executable or shared
  23    library; for other targets, one object is one translation unit.
  24
  25    A copy of this structure declaration is printed by collect2.c;
  26    keep the copies synchronized!  */
  27
  28 struct object {
  29   void *pc_begin;
  30   void *pc_end;
  31   struct dwarf_fde *fde_begin;
  32   struct dwarf_fde **fde_array;
  33   size_t count;
  34   struct object *next;
  35 };
  36
  37 extern void __register_frame (void * );
  38 extern void __register_frame_table (void *);
  39 extern void __deregister_frame (void *);
  40
  41 /* Called either from crtbegin.o or a static constructor to register the
  42    unwind info for an object or translation unit, respectively.  */
  43
  44 extern void __register_frame_info (void *, struct object *);
  45
  46 /* Similar, but BEGIN is actually a pointer to a table of unwind entries
  47    for different translation units.  Called from the file generated by
  48    collect2.  */
  49 extern void __register_frame_info_table (void *, struct object *);
  50
  51 /* Called from crtend.o to deregister the unwind info for an object.  */
  52
  53 extern void *__deregister_frame_info (void *);
  54
  55 /* Called from __throw to find the registers to restore for a given
  56    PC_TARGET.  The caller should allocate a local variable of `struct
  57    frame_state' (declared in frame.h) and pass its address to STATE_IN.
  58    Returns NULL on failure, otherwise returns STATE_IN.  */
  59
  60 extern struct frame_state *__frame_state_for (void *, struct frame_state *);