gcc/function.h

   1 /* Structure for saving state for a nested function.
   2    Copyright (C) 1989, 92-97, 1998 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, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21
  22 #if !defined(NULL_TREE) && !defined(tree)
  23 typedef union union_node *_function_tree;
  24 #define tree _function_tree
  25 #endif
  26 #if !defined(NULL_RTX) && !defined(rtx)
  27 typedef struct rtx_def *_function_rtx;
  28 #define rtx _function_rtx
  29 #endif
  30
  31 struct var_refs_queue
  32 {
  33   rtx modified;
  34   enum machine_mode promoted_mode;
  35   int unsignedp;
  36   struct var_refs_queue *next;
  37 };
  38
  39 /* Stack of pending (incomplete) sequences saved by `start_sequence'.
  40    Each element describes one pending sequence.
  41    The main insn-chain is saved in the last element of the chain,
  42    unless the chain is empty.  */
  43
  44 struct sequence_stack
  45 {
  46   /* First and last insns in the chain of the saved sequence.  */
  47   rtx first, last;
  48   tree sequence_rtl_expr;
  49   struct sequence_stack *next;
  50 };
  51
  52 extern struct sequence_stack *sequence_stack;
  53
  54 /* Stack of single obstacks.  */
  55
  56 struct simple_obstack_stack
  57 {
  58   struct obstack *obstack;
  59   struct simple_obstack_stack *next;
  60 };
  61 \f
  62 /* This structure can save all the important global and static variables
  63    describing the status of the current function.  */
  64
  65 struct function
  66 {
  67   struct function *next;
  68
  69   /* For function.c.  */
  70   char *name;
  71   tree decl;
  72   int pops_args;
  73   int returns_struct;
  74   int returns_pcc_struct;
  75   int returns_pointer;
  76   int needs_context;
  77   int calls_setjmp;
  78   int calls_longjmp;
  79   int calls_alloca;
  80   int has_nonlocal_label;
  81   int has_nonlocal_goto;
  82   int contains_functions;
  83   int addresses_labels;
  84   int is_thunk;
  85   rtx nonlocal_goto_handler_slots;
  86   rtx nonlocal_goto_stack_level;
  87   tree nonlocal_labels;
  88   int args_size;
  89   int pretend_args_size;
  90   rtx arg_offset_rtx;
  91   int varargs;
  92   int stdarg;
  93   int max_parm_reg;
  94   rtx *parm_reg_stack_loc;
  95   int outgoing_args_size;
  96   rtx return_rtx;
  97   rtx cleanup_label;
  98   rtx return_label;
  99   rtx save_expr_regs;
 100   rtx stack_slot_list;
 101   rtx parm_birth_insn;
 102   HOST_WIDE_INT frame_offset;
 103   rtx tail_recursion_label;
 104   rtx tail_recursion_reentry;
 105   rtx internal_arg_pointer;
 106   char *cannot_inline;
 107   rtx arg_pointer_save_area;
 108   tree rtl_expr_chain;
 109   rtx last_parm_insn;
 110   tree context_display;
 111   tree trampoline_list;
 112   int function_call_count;
 113   struct temp_slot *temp_slots;
 114   int temp_slot_level;
 115   int target_temp_slot_level;
 116   int var_temp_slot_level;
 117   int instrument_entry_exit;
 118   /* This slot is initialized as 0 and is added to
 119      during the nested function.  */
 120   struct var_refs_queue *fixup_var_refs_queue;
 121   CUMULATIVE_ARGS args_info;
 122
 123   /* For stmt.c  */
 124   struct nesting *block_stack;
 125   struct nesting *stack_block_stack;
 126   struct nesting *cond_stack;
 127   struct nesting *loop_stack;
 128   struct nesting *case_stack;
 129   struct nesting *nesting_stack;
 130   int nesting_depth;
 131   int block_start_count;
 132   tree last_expr_type;
 133   rtx last_expr_value;
 134   int expr_stmts_for_value;
 135   char *emit_filename;
 136   int emit_lineno;
 137   struct goto_fixup *goto_fixup_chain;
 138
 139   /* For exception handling information.  */
 140   struct eh_stack ehstack;
 141   struct eh_stack catchstack;
 142   struct eh_queue ehqueue;
 143   rtx catch_clauses;
 144   struct label_node *false_label_stack;
 145   struct label_node *caught_return_label_stack;
 146   tree protect_list;
 147   rtx ehc;
 148
 149   /* For expr.c.  */
 150   rtx pending_chain;
 151   int pending_stack_adjust;
 152   int inhibit_defer_pop;
 153   rtx saveregs_value;
 154   rtx apply_args_value;
 155   rtx forced_labels;
 156   int check_memory_usage;
 157
 158   /* For emit-rtl.c.  */
 159   int reg_rtx_no;
 160   int first_label_num;
 161   rtx first_insn;
 162   rtx last_insn;
 163   tree sequence_rtl_expr;
 164   struct sequence_stack *sequence_stack;
 165   int cur_insn_uid;
 166   int last_linenum;
 167   char *last_filename;
 168   char *regno_pointer_flag;
 169   char *regno_pointer_align;
 170   int regno_pointer_flag_length;
 171   rtx *regno_reg_rtx;
 172
 173   /* For stor-layout.c.  */
 174   tree permanent_type_chain;
 175   tree temporary_type_chain;
 176   tree permanent_type_end;
 177   tree temporary_type_end;
 178   tree pending_sizes;
 179   int immediate_size_expand;
 180
 181   /* For tree.c.  */
 182   int all_types_permanent;
 183   struct momentary_level *momentary_stack;
 184   char *maybepermanent_firstobj;
 185   char *temporary_firstobj;
 186   char *momentary_firstobj;
 187   char *momentary_function_firstobj;
 188   struct obstack *current_obstack;
 189   struct obstack *function_obstack;
 190   struct obstack *function_maybepermanent_obstack;
 191   struct obstack *expression_obstack;
 192   struct obstack *saveable_obstack;
 193   struct obstack *rtl_obstack;
 194   struct simple_obstack_stack *inline_obstacks;
 195
 196   /* For integrate.c.  */
 197   int uses_const_pool;
 198
 199   /* For md files.  */
 200   int uses_pic_offset_table;
 201   /* tm.h can use this to store whatever it likes.  */
 202   struct machine_function *machine;
 203
 204   /* For reorg.  */
 205   rtx epilogue_delay_list;
 206
 207   /* For varasm.  */
 208   struct constant_descriptor **const_rtx_hash_table;
 209   struct pool_sym **const_rtx_sym_hash_table;
 210   struct pool_constant *first_pool, *last_pool;
 211   int pool_offset;
 212   rtx const_double_chain;
 213 };
 214
 215 /* The FUNCTION_DECL for an inline function currently being expanded.  */
 216 extern tree inline_function_decl;
 217
 218 /* Label that will go on function epilogue.
 219    Jumping to this label serves as a "return" instruction
 220    on machines which require execution of the epilogue on all returns.  */
 221 extern rtx return_label;
 222
 223 /* List (chain of EXPR_LISTs) of all stack slots in this function.
 224    Made for the sake of unshare_all_rtl.  */
 225 extern rtx stack_slot_list;
 226
 227 /* Given a function decl for a containing function,
 228    return the `struct function' for it.  */
 229 struct function *find_function_data PROTO((tree));
 230
 231 /* Pointer to chain of `struct function' for containing functions.  */
 232 extern struct function *outer_function_chain;
 233
 234 /* Put all this function's BLOCK nodes into a vector and return it.
 235    Also store in each NOTE for the beginning or end of a block
 236    the index of that block in the vector.  */
 237 extern tree *identify_blocks PROTO((tree, rtx));
 238
 239 /* Return size needed for stack frame based on slots so far allocated.
 240    This size counts from zero.  It is not rounded to STACK_BOUNDARY;
 241    the caller may have to do that.  */
 242 extern HOST_WIDE_INT get_frame_size PROTO((void));
 243
 244 /* These variables hold pointers to functions to
 245    save and restore machine-specific data,
 246    in push_function_context and pop_function_context.  */
 247 extern void (*save_machine_status) PROTO((struct function *));
 248 extern void (*restore_machine_status) PROTO((struct function *));
 249
 250 /* Save and restore status information for a nested function.  */
 251 extern void save_tree_status            PROTO((struct function *, tree));
 252 extern void restore_tree_status         PROTO((struct function *, tree));
 253 extern void save_varasm_status          PROTO((struct function *, tree));
 254 extern void restore_varasm_status       PROTO((struct function *));
 255 extern void save_eh_status              PROTO((struct function *));
 256 extern void restore_eh_status           PROTO((struct function *));
 257 extern void save_stmt_status            PROTO((struct function *));
 258 extern void restore_stmt_status         PROTO((struct function *));
 259 extern void save_expr_status            PROTO((struct function *));
 260 extern void restore_expr_status         PROTO((struct function *));
 261 extern void save_emit_status            PROTO((struct function *));
 262 extern void restore_emit_status         PROTO((struct function *));
 263 extern void save_storage_status         PROTO((struct function *));
 264 extern void restore_storage_status      PROTO((struct function *));
 265
 266 extern rtx get_first_block_beg          PROTO((void));
 267
 268 #ifdef rtx
 269 #undef rtx
 270 #endif
 271
 272 #ifdef tree
 273 #undef tree
 274 #endif