gcc/function.h

   1 /* Structure for saving state for a nested function.
   2    Copyright (C) 1989 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20
  21 #ifndef NULL_TREE
  22 #define tree int *
  23 #endif
  24 #ifndef GET_CODE
  25 #define rtx int *
  26 #endif
  27
  28 struct var_refs_queue
  29   {
  30     rtx modified;
  31     rtx original;
  32     struct var_refs_queue *next;
  33   };
  34
  35 /* Stack of pending (incomplete) sequences saved by `start_sequence'.
  36    Each element describes one pending sequence.
  37    The main insn-chain is saved in the last element of the chain,
  38    unless the chain is empty.  */
  39
  40 struct sequence_stack
  41 {
  42   /* First and last insns in the chain of the saved sequence.  */
  43   rtx first, last;
  44   struct sequence_stack *next;
  45 };
  46
  47 extern struct sequence_stack *sequence_stack;
  48 \f
  49 /* This structure can save all the important global and static variables
  50    describing the status of the current function.  */
  51
  52 struct function
  53 {
  54   struct function *next;
  55
  56   /* For function.c.  */
  57   char *name;
  58   tree decl;
  59   int pops_args;
  60   int returns_struct;
  61   int returns_pcc_struct;
  62   int needs_context;
  63   int calls_setjmp;
  64   int calls_longjmp;
  65   int calls_alloca;
  66   int has_nonlocal_label;
  67   rtx nonlocal_goto_handler_slot;
  68   rtx nonlocal_goto_stack_level;
  69   tree nonlocal_labels;
  70   int args_size;
  71   int pretend_args_size;
  72   rtx arg_offset_rtx;
  73   int max_parm_reg;
  74   rtx *parm_reg_stack_loc;
  75   int outgoing_args_size;
  76   rtx return_rtx;
  77   rtx cleanup_label;
  78   rtx return_label;
  79   rtx save_expr_regs;
  80   rtx stack_slot_list;
  81   rtx parm_birth_insn;
  82   int frame_offset;
  83   rtx tail_recursion_label;
  84   rtx tail_recursion_reentry;
  85   rtx internal_arg_pointer;
  86   rtx arg_pointer_save_area;
  87   tree rtl_expr_chain;
  88   rtx last_parm_insn;
  89   tree context_display;
  90   tree trampoline_list;
  91   int function_call_count;
  92   struct temp_slot *temp_slots;
  93   int temp_slot_level;
  94   /* This slot is initialized as 0 and is added to
  95      during the nested function.  */
  96   struct var_refs_queue *fixup_var_refs_queue;
  97
  98   /* For stmt.c  */
  99   struct nesting *block_stack;
 100   struct nesting *stack_block_stack;
 101   struct nesting *cond_stack;
 102   struct nesting *loop_stack;
 103   struct nesting *case_stack;
 104   struct nesting *nesting_stack;
 105   int nesting_depth;
 106   int block_start_count;
 107   tree last_expr_type;
 108   rtx last_expr_value;
 109   int expr_stmts_for_value;
 110   char *emit_filename;
 111   int emit_lineno;
 112   struct goto_fixup *goto_fixup_chain;
 113
 114   /* For expr.c.  */
 115   int pending_stack_adjust;
 116   int inhibit_defer_pop;
 117   tree cleanups_this_call;
 118   rtx saveregs_value;
 119   rtx forced_labels;
 120
 121   /* For emit-rtl.c.  */
 122   int reg_rtx_no;
 123   int first_label_num;
 124   rtx first_insn;
 125   rtx last_insn;
 126   struct sequence_stack *sequence_stack;
 127   int cur_insn_uid;
 128   int last_linenum;
 129   char *last_filename;
 130   char *regno_pointer_flag;
 131   int regno_pointer_flag_length;
 132   rtx *regno_reg_rtx;
 133
 134   /* For stor-layout.c.  */
 135   tree permanent_type_chain;
 136   tree temporary_type_chain;
 137   tree permanent_type_end;
 138   tree temporary_type_end;
 139   tree pending_sizes;
 140   int immediate_size_expand;
 141
 142   /* For tree.c.  */
 143   int all_types_permanent;
 144   struct momentary_level *momentary_stack;
 145   char *maybepermanent_firstobj;
 146   char *temporary_firstobj;
 147   char *momentary_firstobj;
 148   struct obstack *current_obstack;
 149   struct obstack *function_obstack;
 150   struct obstack *function_maybepermanent_obstack;
 151   struct obstack *expression_obstack;
 152   struct obstack *saveable_obstack;
 153   struct obstack *rtl_obstack;
 154
 155   /* For integrate.c.  */
 156   int uses_const_pool;
 157
 158   /* For md files.  */
 159   int uses_pic_offset_table;
 160 };
 161
 162 /* The FUNCTION_DECL for an inline function currently being expanded.  */
 163 extern tree inline_function_decl;
 164
 165 /* Label that will go on function epilogue.
 166    Jumping to this label serves as a "return" instruction
 167    on machines which require execution of the epilogue on all returns.  */
 168 extern rtx return_label;
 169
 170 /* List (chain of EXPR_LISTs) of all stack slots in this function.
 171    Made for the sake of unshare_all_rtl.  */
 172 extern rtx stack_slot_list;
 173
 174 #ifdef rtx
 175 #undef rtx
 176 #endif
 177
 178 #ifdef tree
 179 #undef tree
 180 #endif
 181
 182
 183 /* Given a function decl for a containing function,
 184    return the `struct function' for it.  */
 185 struct function *find_function_data ();
 186
 187 /* Pointer to chain of `struct function' for containing functions.  */
 188 extern struct function *outer_function_chain;