gcc/function.h

   1 /* Structure for saving state for a nested function.
   2    Copyright (C) 1989, 1992, 1993, 1994 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   enum machine_mode promoted_mode;
  32   int unsignedp;
  33   struct var_refs_queue *next;
  34 };
  35
  36 /* Stack of pending (incomplete) sequences saved by `start_sequence'.
  37    Each element describes one pending sequence.
  38    The main insn-chain is saved in the last element of the chain,
  39    unless the chain is empty.  */
  40
  41 struct sequence_stack
  42 {
  43   /* First and last insns in the chain of the saved sequence.  */
  44   rtx first, last;
  45   tree sequence_rtl_expr;
  46   struct sequence_stack *next;
  47 };
  48
  49 extern struct sequence_stack *sequence_stack;
  50 \f
  51 /* This structure can save all the important global and static variables
  52    describing the status of the current function.  */
  53
  54 struct function
  55 {
  56   struct function *next;
  57
  58   /* For function.c.  */
  59   char *name;
  60   tree decl;
  61   int pops_args;
  62   int returns_struct;
  63   int returns_pcc_struct;
  64   int needs_context;
  65   int calls_setjmp;
  66   int calls_longjmp;
  67   int calls_alloca;
  68   int has_nonlocal_label;
  69   int has_nonlocal_goto;
  70   rtx nonlocal_goto_handler_slot;
  71   rtx nonlocal_goto_stack_level;
  72   tree nonlocal_labels;
  73   int args_size;
  74   int pretend_args_size;
  75   rtx arg_offset_rtx;
  76   int varargs;
  77   int max_parm_reg;
  78   rtx *parm_reg_stack_loc;
  79   int outgoing_args_size;
  80   rtx return_rtx;
  81   rtx cleanup_label;
  82   rtx return_label;
  83   rtx save_expr_regs;
  84   rtx stack_slot_list;
  85   rtx parm_birth_insn;
  86   int frame_offset;
  87   rtx tail_recursion_label;
  88   rtx tail_recursion_reentry;
  89   rtx internal_arg_pointer;
  90   rtx arg_pointer_save_area;
  91   tree rtl_expr_chain;
  92   rtx last_parm_insn;
  93   tree context_display;
  94   tree trampoline_list;
  95   int function_call_count;
  96   struct temp_slot *temp_slots;
  97   int temp_slot_level;
  98   /* This slot is initialized as 0 and is added to
  99      during the nested function.  */
 100   struct var_refs_queue *fixup_var_refs_queue;
 101
 102   /* For stmt.c  */
 103   struct nesting *block_stack;
 104   struct nesting *stack_block_stack;
 105   struct nesting *cond_stack;
 106   struct nesting *loop_stack;
 107   struct nesting *case_stack;
 108   struct nesting *nesting_stack;
 109   int nesting_depth;
 110   int block_start_count;
 111   tree last_expr_type;
 112   rtx last_expr_value;
 113   int expr_stmts_for_value;
 114   char *emit_filename;
 115   int emit_lineno;
 116   struct goto_fixup *goto_fixup_chain;
 117
 118   /* For expr.c.  */
 119   int pending_stack_adjust;
 120   int inhibit_defer_pop;
 121   tree cleanups_this_call;
 122   rtx saveregs_value;
 123   rtx apply_args_value;
 124   rtx forced_labels;
 125
 126   /* For emit-rtl.c.  */
 127   int reg_rtx_no;
 128   int first_label_num;
 129   rtx first_insn;
 130   rtx last_insn;
 131   tree sequence_rtl_expr;
 132   struct sequence_stack *sequence_stack;
 133   int cur_insn_uid;
 134   int last_linenum;
 135   char *last_filename;
 136   char *regno_pointer_flag;
 137   int regno_pointer_flag_length;
 138   rtx *regno_reg_rtx;
 139
 140   /* For stor-layout.c.  */
 141   tree permanent_type_chain;
 142   tree temporary_type_chain;
 143   tree permanent_type_end;
 144   tree temporary_type_end;
 145   tree pending_sizes;
 146   int immediate_size_expand;
 147
 148   /* For tree.c.  */
 149   int all_types_permanent;
 150   struct momentary_level *momentary_stack;
 151   char *maybepermanent_firstobj;
 152   char *temporary_firstobj;
 153   char *momentary_firstobj;
 154   char *momentary_function_firstobj;
 155   struct obstack *current_obstack;
 156   struct obstack *function_obstack;
 157   struct obstack *function_maybepermanent_obstack;
 158   struct obstack *expression_obstack;
 159   struct obstack *saveable_obstack;
 160   struct obstack *rtl_obstack;
 161
 162   /* For integrate.c.  */
 163   int uses_const_pool;
 164
 165   /* For md files.  */
 166   int uses_pic_offset_table;
 167   /* tm.h can use this to store whatever it likes.  */
 168   struct machine_function *machine;
 169
 170   /* For reorg.  */
 171   rtx epilogue_delay_list;
 172
 173   /* For varasm.  */
 174   struct constant_descriptor **const_rtx_hash_table;
 175   struct pool_sym **const_rtx_sym_hash_table;
 176   struct pool_constant *first_pool, *last_pool;
 177   int pool_offset;
 178 };
 179
 180 /* The FUNCTION_DECL for an inline function currently being expanded.  */
 181 extern tree inline_function_decl;
 182
 183 /* Label that will go on function epilogue.
 184    Jumping to this label serves as a "return" instruction
 185    on machines which require execution of the epilogue on all returns.  */
 186 extern rtx return_label;
 187
 188 /* List (chain of EXPR_LISTs) of all stack slots in this function.
 189    Made for the sake of unshare_all_rtl.  */
 190 extern rtx stack_slot_list;
 191
 192 /* Given a function decl for a containing function,
 193    return the `struct function' for it.  */
 194 struct function *find_function_data PROTO((tree));
 195
 196 /* Pointer to chain of `struct function' for containing functions.  */
 197 extern struct function *outer_function_chain;
 198
 199 /* Put all this function's BLOCK nodes into a vector and return it.
 200    Also store in each NOTE for the beginning or end of a block
 201    the index of that block in the vector.  */
 202 extern tree *identify_blocks PROTO((tree, rtx));
 203
 204 /* These variables hold pointers to functions to
 205    save and restore machine-specific data,
 206    in push_function_context and pop_function_context.  */
 207 extern void (*save_machine_status) ();
 208 extern void (*restore_machine_status) ();
 209
 210 /* Save and restore varasm.c status for a nested function.  */
 211 extern void save_varasm_status          PROTO((struct function *));
 212 extern void restore_varasm_status       PROTO((struct function *));
 213
 214 #ifdef rtx
 215 #undef rtx
 216 #endif
 217
 218 #ifdef tree
 219 #undef tree
 220 #endif