1 /* Structure for saving state for a nested function.
2 Copyright (C) 1989, 92-97, 1998 Free Software Foundation, Inc.
4 This file is part of GNU CC.
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)
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.
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. */
32 enum machine_mode promoted_mode;
34 struct var_refs_queue *next;
37 /* Stack of pending (incomplete) sequences saved by `start_sequence'.
38 Each element describes one pending sequence.
39 The main insn-chain is saved in the last element of the chain,
40 unless the chain is empty. */
44 /* First and last insns in the chain of the saved sequence. */
46 tree sequence_rtl_expr;
47 struct sequence_stack *next;
50 extern struct sequence_stack *sequence_stack;
52 /* Stack of single obstacks. */
54 struct simple_obstack_stack
56 struct obstack *obstack;
57 struct simple_obstack_stack *next;
60 /* This structure can save all the important global and static variables
61 describing the status of the current function. */
65 struct function *next;
72 int returns_pcc_struct;
78 int has_nonlocal_label;
79 int has_nonlocal_goto;
80 int contains_functions;
82 rtx nonlocal_goto_handler_slot;
83 rtx nonlocal_goto_stack_level;
86 int pretend_args_size;
91 rtx *parm_reg_stack_loc;
92 int outgoing_args_size;
99 HOST_WIDE_INT frame_offset;
100 rtx tail_recursion_label;
101 rtx tail_recursion_reentry;
102 rtx internal_arg_pointer;
103 rtx arg_pointer_save_area;
106 tree context_display;
107 tree trampoline_list;
108 int function_call_count;
109 struct temp_slot *temp_slots;
111 int target_temp_slot_level;
112 int var_temp_slot_level;
113 /* This slot is initialized as 0 and is added to
114 during the nested function. */
115 struct var_refs_queue *fixup_var_refs_queue;
116 CUMULATIVE_ARGS args_info;
119 struct nesting *block_stack;
120 struct nesting *stack_block_stack;
121 struct nesting *cond_stack;
122 struct nesting *loop_stack;
123 struct nesting *case_stack;
124 struct nesting *nesting_stack;
126 int block_start_count;
129 int expr_stmts_for_value;
132 struct goto_fixup *goto_fixup_chain;
134 /* For exception handling information. */
135 struct eh_stack ehstack;
136 struct eh_stack catchstack;
137 struct eh_queue ehqueue;
139 struct label_node *false_label_stack;
140 struct label_node *caught_return_label_stack;
145 int pending_stack_adjust;
146 int inhibit_defer_pop;
148 rtx apply_args_value;
151 /* For emit-rtl.c. */
156 tree sequence_rtl_expr;
157 struct sequence_stack *sequence_stack;
161 char *regno_pointer_flag;
162 char *regno_pointer_align;
163 int regno_pointer_flag_length;
166 /* For stor-layout.c. */
167 tree permanent_type_chain;
168 tree temporary_type_chain;
169 tree permanent_type_end;
170 tree temporary_type_end;
172 int immediate_size_expand;
175 int all_types_permanent;
176 struct momentary_level *momentary_stack;
177 char *maybepermanent_firstobj;
178 char *temporary_firstobj;
179 char *momentary_firstobj;
180 char *momentary_function_firstobj;
181 struct obstack *current_obstack;
182 struct obstack *function_obstack;
183 struct obstack *function_maybepermanent_obstack;
184 struct obstack *expression_obstack;
185 struct obstack *saveable_obstack;
186 struct obstack *rtl_obstack;
187 struct simple_obstack_stack *inline_obstacks;
189 /* For integrate.c. */
193 int uses_pic_offset_table;
194 /* tm.h can use this to store whatever it likes. */
195 struct machine_function *machine;
198 rtx epilogue_delay_list;
201 struct constant_descriptor **const_rtx_hash_table;
202 struct pool_sym **const_rtx_sym_hash_table;
203 struct pool_constant *first_pool, *last_pool;
205 rtx const_double_chain;
208 /* The FUNCTION_DECL for an inline function currently being expanded. */
209 extern tree inline_function_decl;
211 /* Label that will go on function epilogue.
212 Jumping to this label serves as a "return" instruction
213 on machines which require execution of the epilogue on all returns. */
214 extern rtx return_label;
216 /* List (chain of EXPR_LISTs) of all stack slots in this function.
217 Made for the sake of unshare_all_rtl. */
218 extern rtx stack_slot_list;
220 /* Given a function decl for a containing function,
221 return the `struct function' for it. */
222 struct function *find_function_data PROTO((tree));
224 /* Pointer to chain of `struct function' for containing functions. */
225 extern struct function *outer_function_chain;
227 /* Put all this function's BLOCK nodes into a vector and return it.
228 Also store in each NOTE for the beginning or end of a block
229 the index of that block in the vector. */
230 extern tree *identify_blocks PROTO((tree, rtx));
232 /* Return size needed for stack frame based on slots so far allocated.
233 This size counts from zero. It is not rounded to STACK_BOUNDARY;
234 the caller may have to do that. */
235 extern HOST_WIDE_INT get_frame_size PROTO((void));
237 /* These variables hold pointers to functions to
238 save and restore machine-specific data,
239 in push_function_context and pop_function_context. */
240 extern void (*save_machine_status) PROTO((struct function *));
241 extern void (*restore_machine_status) PROTO((struct function *));
243 /* Save and restore status information for a nested function. */
244 extern void save_tree_status PROTO((struct function *, tree));
245 extern void restore_tree_status PROTO((struct function *, tree));
246 extern void save_varasm_status PROTO((struct function *, tree));
247 extern void restore_varasm_status PROTO((struct function *));
248 extern void save_eh_status PROTO((struct function *));
249 extern void restore_eh_status PROTO((struct function *));
250 extern void save_stmt_status PROTO((struct function *));
251 extern void restore_stmt_status PROTO((struct function *));
252 extern void save_expr_status PROTO((struct function *));
253 extern void restore_expr_status PROTO((struct function *));
254 extern void save_emit_status PROTO((struct function *));
255 extern void restore_emit_status PROTO((struct function *));
256 extern void save_storage_status PROTO((struct function *));
257 extern void restore_storage_status PROTO((struct function *));