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1.1 root 1: /* Structure for saving state for a nested function.
2: Copyright (C) 1989, 1992, 1993 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:
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 max_parm_reg;
77: rtx *parm_reg_stack_loc;
78: int outgoing_args_size;
79: rtx return_rtx;
80: rtx cleanup_label;
81: rtx return_label;
82: rtx save_expr_regs;
83: rtx stack_slot_list;
84: rtx parm_birth_insn;
85: int frame_offset;
86: rtx tail_recursion_label;
87: rtx tail_recursion_reentry;
88: rtx internal_arg_pointer;
89: rtx arg_pointer_save_area;
90: tree rtl_expr_chain;
91: rtx last_parm_insn;
92: tree context_display;
93: tree trampoline_list;
94: int function_call_count;
95: struct temp_slot *temp_slots;
96: int temp_slot_level;
97: /* This slot is initialized as 0 and is added to
98: during the nested function. */
99: struct var_refs_queue *fixup_var_refs_queue;
100:
101: /* For stmt.c */
102: struct nesting *block_stack;
103: struct nesting *stack_block_stack;
104: struct nesting *cond_stack;
105: struct nesting *loop_stack;
106: struct nesting *case_stack;
107: struct nesting *nesting_stack;
108: int nesting_depth;
109: int block_start_count;
110: tree last_expr_type;
111: rtx last_expr_value;
112: int expr_stmts_for_value;
113: char *emit_filename;
114: int emit_lineno;
115: struct goto_fixup *goto_fixup_chain;
116:
117: /* For expr.c. */
118: int pending_stack_adjust;
119: int inhibit_defer_pop;
120: tree cleanups_this_call;
121: rtx saveregs_value;
122: rtx apply_args_value;
123: rtx forced_labels;
124:
125: /* For emit-rtl.c. */
126: int reg_rtx_no;
127: int first_label_num;
128: rtx first_insn;
129: rtx last_insn;
130: tree sequence_rtl_expr;
131: struct sequence_stack *sequence_stack;
132: int cur_insn_uid;
133: int last_linenum;
134: char *last_filename;
135: char *regno_pointer_flag;
136: int regno_pointer_flag_length;
137: rtx *regno_reg_rtx;
138:
139: /* For stor-layout.c. */
140: tree permanent_type_chain;
141: tree temporary_type_chain;
142: tree permanent_type_end;
143: tree temporary_type_end;
144: tree pending_sizes;
145: int immediate_size_expand;
146:
147: /* For tree.c. */
148: int all_types_permanent;
149: struct momentary_level *momentary_stack;
150: char *maybepermanent_firstobj;
151: char *temporary_firstobj;
152: char *momentary_firstobj;
153: struct obstack *current_obstack;
154: struct obstack *function_obstack;
155: struct obstack *function_maybepermanent_obstack;
156: struct obstack *expression_obstack;
157: struct obstack *saveable_obstack;
158: struct obstack *rtl_obstack;
159:
160: /* For integrate.c. */
161: int uses_const_pool;
162:
163: /* For md files. */
164: int uses_pic_offset_table;
165: /* tm.h can use this to store whatever it likes. */
166: struct machine_function *machine;
167:
168: /* For reorg. */
169: rtx epilogue_delay_list;
170:
171: /* For varasm. */
172: struct constant_descriptor **const_rtx_hash_table;
173: struct pool_sym **const_rtx_sym_hash_table;
174: struct pool_constant *first_pool, *last_pool;
175: int pool_offset;
176: };
177:
178: /* The FUNCTION_DECL for an inline function currently being expanded. */
179: extern tree inline_function_decl;
180:
181: /* Label that will go on function epilogue.
182: Jumping to this label serves as a "return" instruction
183: on machines which require execution of the epilogue on all returns. */
184: extern rtx return_label;
185:
186: /* List (chain of EXPR_LISTs) of all stack slots in this function.
187: Made for the sake of unshare_all_rtl. */
188: extern rtx stack_slot_list;
189:
190: /* Given a function decl for a containing function,
191: return the `struct function' for it. */
192: struct function *find_function_data PROTO((tree));
193:
194: /* Pointer to chain of `struct function' for containing functions. */
195: extern struct function *outer_function_chain;
196:
197: /* Put all this function's BLOCK nodes into a vector and return it.
198: Also store in each NOTE for the beginning or end of a block
199: the index of that block in the vector. */
200: extern tree *identify_blocks PROTO((tree, rtx));
201:
202: /* These variables hold pointers to functions to
203: save and restore machine-specific data,
204: in push_function_context and pop_function_context. */
205: extern void (*save_machine_status) ();
206: extern void (*restore_machine_status) ();
207:
208: #ifdef rtx
209: #undef rtx
210: #endif
211:
212: #ifdef tree
213: #undef tree
214: #endif
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