1	/* Core data structures for the 'tree' type.
2	Copyright (C) 1989-2025 Free Software Foundation, Inc.
3
4	This file is part of GCC.
5
6	GCC is free software; you can redistribute it and/or modify it under
7	the terms of the GNU General Public License as published by the Free
8	Software Foundation; either version 3, or (at your option) any later
9	version.
10
11	GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12	WARRANTY; without even the implied warranty of MERCHANTABILITY or
13	FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14	for more details.
15
16	You should have received a copy of the GNU General Public License
17	along with GCC; see the file COPYING3. If not see
18	<http://www.gnu.org/licenses/>. */
19
20	#ifndef GCC_TREE_CORE_H
21	#define GCC_TREE_CORE_H
22
23	#include "symtab.h"
24
25	/* This file contains all the data structures that define the 'tree' type.
26	There are no accessor macros nor functions in this file. Only the
27	basic data structures, extern declarations and type definitions. */
28
29	/*---------------------------------------------------------------------------
30	Forward type declarations. Mostly to avoid including unnecessary headers
31	---------------------------------------------------------------------------*/
32	struct function;
33	struct real_value;
34	struct fixed_value;
35	struct ptr_info_def;
36	struct die_struct;
37
38
39	/*---------------------------------------------------------------------------
40	#defined constants
41	---------------------------------------------------------------------------*/
42	/* Nonzero if this is a call to a function whose return value depends
43	solely on its arguments, has no side effects, and does not read
44	global memory. This corresponds to TREE_READONLY for function
45	decls. */
46	#define ECF_CONST (1 << 0)
47
48	/* Nonzero if this is a call to "pure" function (like const function,
49	but may read memory. This corresponds to DECL_PURE_P for function
50	decls. */
51	#define ECF_PURE (1 << 1)
52
53	/* Nonzero if this is ECF_CONST or ECF_PURE but cannot be proven to no
54	infinite loop. This corresponds to DECL_LOOPING_CONST_OR_PURE_P
55	for function decls.*/
56	#define ECF_LOOPING_CONST_OR_PURE (1 << 2)
57
58	/* Nonzero if this call will never return. */
59	#define ECF_NORETURN (1 << 3)
60
61	/* Nonzero if this is a call to malloc or a related function. */
62	#define ECF_MALLOC (1 << 4)
63
64	/* Nonzero if it is plausible that this is a call to alloca. */
65	#define ECF_MAY_BE_ALLOCA (1 << 5)
66
67	/* Nonzero if this is a call to a function that won't throw an exception. */
68	#define ECF_NOTHROW (1 << 6)
69
70	/* Nonzero if this is a call to setjmp or a related function. */
71	#define ECF_RETURNS_TWICE (1 << 7)
72
73	/* Nonzero if this call replaces the current stack frame. */
74	#define ECF_SIBCALL (1 << 8)
75
76	/* Function does not read or write memory (but may have side effects, so
77	it does not necessarily fit ECF_CONST). */
78	#define ECF_NOVOPS (1 << 9)
79
80	/* The function does not lead to calls within current function unit. */
81	#define ECF_LEAF (1 << 10)
82
83	/* Nonzero if this call returns its first argument. */
84	#define ECF_RET1 (1 << 11)
85
86	/* Nonzero if this call does not affect transactions. */
87	#define ECF_TM_PURE (1 << 12)
88
89	/* Nonzero if this call is into the transaction runtime library. */
90	#define ECF_TM_BUILTIN (1 << 13)
91
92	/* Nonzero if this is an indirect call by descriptor. */
93	#define ECF_BY_DESCRIPTOR (1 << 14)
94
95	/* Nonzero if this is a cold function. */
96	#define ECF_COLD (1 << 15)
97
98	/* Nonzero if this is a function expected to end with an exception. */
99	#define ECF_XTHROW (1 << 16)
100
101	/* Call argument flags. */
102
103	/* Nonzero if the argument is not used by the function. */
104	#define EAF_UNUSED (1 << 1)
105
106	/* Following flags come in pairs. First one is about direct dereferences
107	from the parameter, while the second is about memory reachable by
108	recursive dereferences. */
109
110	/* Nonzero if memory reached by the argument is not clobbered. */
111	#define EAF_NO_DIRECT_CLOBBER (1 << 2)
112	#define EAF_NO_INDIRECT_CLOBBER (1 << 3)
113
114	/* Nonzero if the argument does not escape. */
115	#define EAF_NO_DIRECT_ESCAPE (1 << 4)
116	#define EAF_NO_INDIRECT_ESCAPE (1 << 5)
117
118	/* Nonzero if the argument does not escape to return value. */
119	#define EAF_NOT_RETURNED_DIRECTLY (1 << 6)
120	#define EAF_NOT_RETURNED_INDIRECTLY (1 << 7)
121
122	/* Nonzero if the argument is not read. */
123	#define EAF_NO_DIRECT_READ (1 << 8)
124	#define EAF_NO_INDIRECT_READ (1 << 9)
125
126	/* Call return flags. */
127	/* Mask for the argument number that is returned. Lower two bits of
128	the return flags, encodes argument slots zero to three. */
129	#define ERF_RETURN_ARG_MASK (3)
130
131	/* Nonzero if the return value is equal to the argument number
132	flags & ERF_RETURN_ARG_MASK. */
133	#define ERF_RETURNS_ARG (1 << 2)
134
135	/* Nonzero if the return value does not alias with anything. Functions
136	with the malloc attribute have this set on their return value. */
137	#define ERF_NOALIAS (1 << 3)
138
139
140	/*---------------------------------------------------------------------------
141	Enumerations
142	---------------------------------------------------------------------------*/
143	/* Codes of tree nodes. */
144	#define DEFTREECODE(SYM, STRING, TYPE, NARGS) SYM,
145	#define END_OF_BASE_TREE_CODES LAST_AND_UNUSED_TREE_CODE,
146
147	enum tree_code {
148	#include "all-tree.def"
149	MAX_TREE_CODES
150	};
151
152	#undef DEFTREECODE
153	#undef END_OF_BASE_TREE_CODES
154
155	/* Number of language-independent tree codes. */
156	#define NUM_TREE_CODES \
157	((int) LAST_AND_UNUSED_TREE_CODE)
158
159	#define CODE_CONTAINS_STRUCT(CODE, STRUCT) \
160	(tree_contains_struct[(CODE)][(STRUCT)])
161
162
163	/* Classify which part of the compiler has defined a given builtin function.
164	Note that we assume below that this is no more than two bits. */
165	enum built_in_class {
166	NOT_BUILT_IN = 0,
167	BUILT_IN_FRONTEND,
168	BUILT_IN_MD,
169	BUILT_IN_NORMAL
170	};
171
172	/* Last marker used for LTO stremaing of built_in_class. We cannot add it
173	to the enum since we need the enumb to fit in 2 bits. */
174	#define BUILT_IN_LAST (BUILT_IN_NORMAL + 1)
175
176	/* Codes that identify the various built in functions
177	so that expand_call can identify them quickly. */
178	#define DEF_BUILTIN(ENUM, N, C, T, LT, B, F, NA, AT, IM, COND) ENUM,
179	enum built_in_function {
180	#include "builtins.def"
181	/* Complex division routines in libgcc. These are done via builtins
182	because emit_library_call_value can't handle complex values. */
183	BUILT_IN_COMPLEX_MUL_MIN,
184	BUILT_IN_COMPLEX_MUL_MAX
185	= BUILT_IN_COMPLEX_MUL_MIN
186	+ MAX_MODE_COMPLEX_FLOAT
187	- MIN_MODE_COMPLEX_FLOAT,
188
189	BUILT_IN_COMPLEX_DIV_MIN,
190	BUILT_IN_COMPLEX_DIV_MAX
191	= BUILT_IN_COMPLEX_DIV_MIN
192	+ MAX_MODE_COMPLEX_FLOAT
193	- MIN_MODE_COMPLEX_FLOAT,
194
195	/* Upper bound on non-language-specific builtins. */
196	END_BUILTINS
197	};
198
199	/* Internal functions. */
200	enum internal_fn {
201	#define DEF_INTERNAL_FN(CODE, FLAGS, FNSPEC) IFN_##CODE,
202	#include "internal-fn.def"
203	IFN_LAST
204	};
205
206	/* An enum that combines target-independent built-in functions with
207	internal functions, so that they can be treated in a similar way.
208	The numbers for built-in functions are the same as for the
209	built_in_function enum. The numbers for internal functions
210	start at END_BUITLINS. */
211	enum combined_fn {
212	#define DEF_BUILTIN(ENUM, N, C, T, LT, B, F, NA, AT, IM, COND) \
213	CFN_##ENUM = int (ENUM),
214	#include "builtins.def"
215
216
217	#define DEF_INTERNAL_FN(CODE, FLAGS, FNSPEC) \
218	CFN_##CODE = int (END_BUILTINS) + int (IFN_##CODE),
219	#include "internal-fn.def"
220
221	CFN_LAST
222	};
223
224	/* Tree code classes. Each tree_code has an associated code class
225	represented by a TREE_CODE_CLASS. */
226	enum tree_code_class {
227	tcc_exceptional, /* An exceptional code (fits no category). */
228	tcc_constant, /* A constant. */
229	/* Order of tcc_type and tcc_declaration is important. */
230	tcc_type, /* A type object code. */
231	tcc_declaration, /* A declaration (also serving as variable refs). */
232	tcc_reference, /* A reference to storage. */
233	tcc_comparison, /* A comparison expression. */
234	tcc_unary, /* A unary arithmetic expression. */
235	tcc_binary, /* A binary arithmetic expression. */
236	tcc_statement, /* A statement expression, which have side effects
237	but usually no interesting value. */
238	tcc_vl_exp, /* A function call or other expression with a
239	variable-length operand vector. */
240	tcc_expression /* Any other expression. */
241	};
242
243	/* OMP_CLAUSE codes. Do not reorder, as this is used to index into
244	the tables omp_clause_num_ops and omp_clause_code_name.
245
246	Note additionally that there are various range checks such as
247	for OMP_CLAUSE_SIZE or OMP_CLAUSE_DECL; clauses having those shall
248	be inside that range, those that have not shall be outside. */
249
250	enum omp_clause_code {
251	/* Clause zero is special-cased inside the parser
252	(c_parser_omp_variable_list). */
253	OMP_CLAUSE_ERROR = 0,
254
255	/* Range START below for: OMP_CLAUSE_DECL */
256
257	/* OpenACC/OpenMP clause: private (variable_list). */
258	OMP_CLAUSE_PRIVATE,
259
260	/* OpenMP clause: shared (variable_list). */
261	OMP_CLAUSE_SHARED,
262
263	/* OpenACC/OpenMP clause: firstprivate (variable_list). */
264	OMP_CLAUSE_FIRSTPRIVATE,
265
266	/* OpenMP clause: lastprivate (variable_list). */
267	OMP_CLAUSE_LASTPRIVATE,
268
269	/* Range START below for: OMP_CLAUSE_REDUCTION_CODE and
270	OMP_CLAUSE_REDUCTION_{INIT,MERGE,{DECL_,}PLACEHOLDER,OMP_ORIG_REF} */
271
272	/* OpenACC/OpenMP clause: reduction (operator:variable_list).
273	OMP_CLAUSE_REDUCTION_CODE: The tree_code of the operator.
274	Operand 1: OMP_CLAUSE_REDUCTION_INIT: Stmt-list to initialize the var.
275	Operand 2: OMP_CLAUSE_REDUCTION_MERGE: Stmt-list to merge private var
276	into the shared one.
277	Operand 3: OMP_CLAUSE_REDUCTION_PLACEHOLDER: A dummy VAR_DECL
278	placeholder used in OMP_CLAUSE_REDUCTION_{INIT,MERGE}.
279	Operand 4: OMP_CLAUSE_REDUCTION_DECL_PLACEHOLDER: Another dummy
280	VAR_DECL placeholder, used like the above for C/C++ array
281	reductions. */
282	OMP_CLAUSE_REDUCTION,
283
284	/* OpenMP clause: task_reduction (operator:variable_list). */
285	OMP_CLAUSE_TASK_REDUCTION,
286
287	/* OpenMP clause: in_reduction (operator:variable_list). */
288	OMP_CLAUSE_IN_REDUCTION,
289
290	/* Range END above for: OMP_CLAUSE_REDUCTION_CODE and
291	OMP_CLAUSE_REDUCTION_{INIT,MERGE,{DECL_,}PLACEHOLDER,OMP_ORIG_REF} */
292
293	/* OpenMP clause: copyin (variable_list). */
294	OMP_CLAUSE_COPYIN,
295
296	/* OpenMP clause: copyprivate (variable_list). */
297	OMP_CLAUSE_COPYPRIVATE,
298
299	/* OpenMP clause: linear (variable-list[:linear-step]). */
300	OMP_CLAUSE_LINEAR,
301
302	/* OpenMP clause: affinity([depend-modifier :] variable-list). */
303	OMP_CLAUSE_AFFINITY,
304
305	/* OpenMP clause: aligned (variable-list[:alignment]). */
306	OMP_CLAUSE_ALIGNED,
307
308	/* OpenMP clause: allocate ([allocator:]variable-list). */
309	OMP_CLAUSE_ALLOCATE,
310
311	/* OpenMP clause: depend ({in,out,inout}:variable-list). */
312	OMP_CLAUSE_DEPEND,
313
314	/* OpenMP clause: nontemporal (variable-list). */
315	OMP_CLAUSE_NONTEMPORAL,
316
317	/* OpenMP clause: uniform (argument-list). */
318	OMP_CLAUSE_UNIFORM,
319
320	/* OpenMP clause: enter (extended-list).
321	to is a deprecated alias when it appears in declare target. */
322	OMP_CLAUSE_ENTER,
323
324	/* OpenMP clause: link (variable-list). */
325	OMP_CLAUSE_LINK,
326
327	/* OpenMP clause: detach (event-handle). */
328	OMP_CLAUSE_DETACH,
329
330	/* OpenACC clause: use_device (variable-list).
331	OpenMP clause: use_device_ptr (ptr-list). */
332	OMP_CLAUSE_USE_DEVICE_PTR,
333
334	/* OpenMP clause: use_device_addr (variable-list). */
335	OMP_CLAUSE_USE_DEVICE_ADDR,
336
337	/* OpenMP clause: is_device_ptr (variable-list). */
338	OMP_CLAUSE_IS_DEVICE_PTR,
339
340	/* OpenMP clause: inclusive (variable-list). */
341	OMP_CLAUSE_INCLUSIVE,
342
343	/* OpenMP clause: exclusive (variable-list). */
344	OMP_CLAUSE_EXCLUSIVE,
345
346	/* Range START below for: OMP_CLAUSE_SIZE */
347	/* Range START below for: OMP_CLAUSE_MOTION_PRESENT */
348
349	/* OpenMP clause: from (variable-list). */
350	OMP_CLAUSE_FROM,
351
352	/* OpenMP clause: to (variable-list). */
353	OMP_CLAUSE_TO,
354
355	/* Range END above for: OMP_CLAUSE_MOTION_PRESENT */
356
357	/* OpenACC clauses: {copy, copyin, copyout, create, delete, deviceptr,
358	device, host (self), present, present_or_copy (pcopy), present_or_copyin
359	(pcopyin), present_or_copyout (pcopyout), present_or_create (pcreate)}
360	(variable-list).
361
362	OpenMP clause: map ({alloc:,to:,from:,tofrom:,}variable-list). */
363	OMP_CLAUSE_MAP,
364
365	/* OpenMP clause: has_device_addr (variable-list). */
366	OMP_CLAUSE_HAS_DEVICE_ADDR,
367
368	/* OpenMP clause: doacross ({source,sink}:vec). */
369	OMP_CLAUSE_DOACROSS,
370
371	/* OpenMP mapper binding: record implicit mappers in scope for aggregate
372	types used within an offload region. */
373	OMP_CLAUSE__MAPPER_BINDING_,
374
375	/* Internal structure to hold OpenACC cache directive's variable-list.
376	#pragma acc cache (variable-list). */
377	OMP_CLAUSE__CACHE_,
378
379	/* Range END above for: OMP_CLAUSE_SIZE */
380
381	/* OpenMP clause: destroy (variable-list ). */
382	OMP_CLAUSE_DESTROY,
383
384	/* Range START below for: OMP_CLAUSE_INIT_PREFER_TYPE */
385
386	/* OpenMP clause: init ( [modifier-list : ] variable-list ). */
387	OMP_CLAUSE_INIT,
388
389	/* Range END above for: OMP_CLAUSE_INIT_PREFER_TYPE */
390
391	/* OpenMP clause: use (variable-list ). */
392	OMP_CLAUSE_USE,
393
394	/* OpenMP clause: interop (variable-list). */
395	OMP_CLAUSE_INTEROP,
396
397	/* OpenACC clause: gang [(gang-argument-list)].
398	Where
399	gang-argument-list: [gang-argument-list, ] gang-argument
400	gang-argument: [num:] integer-expression
401	| static: size-expression
402	size-expression: * | integer-expression. */
403	OMP_CLAUSE_GANG,
404
405	/* OpenACC clause: async [(integer-expression)]. */
406	OMP_CLAUSE_ASYNC,
407
408	/* OpenACC clause: wait [(integer-expression-list)]. */
409	OMP_CLAUSE_WAIT,
410
411	/* OpenACC clause: auto. */
412	OMP_CLAUSE_AUTO,
413
414	/* OpenACC clause: seq. */
415	OMP_CLAUSE_SEQ,
416
417	/* Internal clause: temporary for combined loops expansion. */
418	OMP_CLAUSE__LOOPTEMP_,
419
420	/* Internal clause: temporary for task reductions. */
421	OMP_CLAUSE__REDUCTEMP_,
422
423	/* Internal clause: temporary for lastprivate(conditional:). */
424	OMP_CLAUSE__CONDTEMP_,
425
426	/* Internal clause: temporary for inscan reductions. */
427	OMP_CLAUSE__SCANTEMP_,
428
429	/* Range END above for: OMP_CLAUSE_DECL */
430
431	/* OpenACC/OpenMP clause: if (scalar-expression). */
432	OMP_CLAUSE_IF,
433
434	/* OpenACC clause: self. */
435	OMP_CLAUSE_SELF,
436
437	/* OpenMP clause: num_threads (integer-expression). */
438	OMP_CLAUSE_NUM_THREADS,
439
440	/* OpenMP clause: schedule. */
441	OMP_CLAUSE_SCHEDULE,
442
443	/* OpenMP clause: nowait. */
444	OMP_CLAUSE_NOWAIT,
445
446	/* OpenMP clause: ordered [(constant-integer-expression)]. */
447	OMP_CLAUSE_ORDERED,
448
449	/* OpenACC/OpenMP clause: default. */
450	OMP_CLAUSE_DEFAULT,
451
452	/* OpenACC/OpenMP clause: collapse (constant-integer-expression). */
453	OMP_CLAUSE_COLLAPSE,
454
455	/* OpenMP clause: untied. */
456	OMP_CLAUSE_UNTIED,
457
458	/* OpenMP clause: final (scalar-expression). */
459	OMP_CLAUSE_FINAL,
460
461	/* OpenMP clause: mergeable. */
462	OMP_CLAUSE_MERGEABLE,
463
464	/* OpenMP clause: device (integer-expression). */
465	OMP_CLAUSE_DEVICE,
466
467	/* OpenMP clause: dist_schedule (static[:chunk-size]). */
468	OMP_CLAUSE_DIST_SCHEDULE,
469
470	/* OpenMP clause: inbranch. */
471	OMP_CLAUSE_INBRANCH,
472
473	/* OpenMP clause: notinbranch. */
474	OMP_CLAUSE_NOTINBRANCH,
475
476	/* OpenMP clause: num_teams(integer-expression). */
477	OMP_CLAUSE_NUM_TEAMS,
478
479	/* OpenMP clause: thread_limit(integer-expression). */
480	OMP_CLAUSE_THREAD_LIMIT,
481
482	/* OpenMP clause: proc_bind ({master,close,spread}). */
483	OMP_CLAUSE_PROC_BIND,
484
485	/* OpenMP clause: safelen (constant-integer-expression). */
486	OMP_CLAUSE_SAFELEN,
487
488	/* OpenMP clause: simdlen (constant-integer-expression). */
489	OMP_CLAUSE_SIMDLEN,
490
491	/* OpenMP clause: device_type ({host,nohost,any}). */
492	OMP_CLAUSE_DEVICE_TYPE,
493
494	/* OpenMP clause: for. */
495	OMP_CLAUSE_FOR,
496
497	/* OpenMP clause: parallel. */
498	OMP_CLAUSE_PARALLEL,
499
500	/* OpenMP clause: sections. */
501	OMP_CLAUSE_SECTIONS,
502
503	/* OpenMP clause: taskgroup. */
504	OMP_CLAUSE_TASKGROUP,
505
506	/* OpenMP clause: priority (integer-expression). */
507	OMP_CLAUSE_PRIORITY,
508
509	/* OpenMP clause: grainsize (integer-expression). */
510	OMP_CLAUSE_GRAINSIZE,
511
512	/* OpenMP clause: num_tasks (integer-expression). */
513	OMP_CLAUSE_NUM_TASKS,
514
515	/* OpenMP clause: nogroup. */
516	OMP_CLAUSE_NOGROUP,
517
518	/* OpenMP clause: threads. */
519	OMP_CLAUSE_THREADS,
520
521	/* OpenMP clause: simd. */
522	OMP_CLAUSE_SIMD,
523
524	/* OpenMP clause: hint (integer-expression). */
525	OMP_CLAUSE_HINT,
526
527	/* OpenMP clause: defaultmap (tofrom: scalar). */
528	OMP_CLAUSE_DEFAULTMAP,
529
530	/* OpenMP clause: order (concurrent). */
531	OMP_CLAUSE_ORDER,
532
533	/* OpenMP clause: bind (binding). */
534	OMP_CLAUSE_BIND,
535
536	/* OpenMP clause: filter (integer-expression). */
537	OMP_CLAUSE_FILTER,
538
539	/* OpenMP clause: indirect [(constant-integer-expression)]. */
540	OMP_CLAUSE_INDIRECT,
541
542	/* OpenMP clause: partial (constant-integer-expression). */
543	OMP_CLAUSE_PARTIAL,
544
545	/* OpenMP clause: full. */
546	OMP_CLAUSE_FULL,
547
548	/* OpenMP clause: sizes (constant-integer-expression-list). */
549	OMP_CLAUSE_SIZES,
550
551	/* Internally used only clause, holding SIMD uid. */
552	OMP_CLAUSE__SIMDUID_,
553
554	/* Internally used only clause, flag whether this is SIMT simd
555	loop or not. */
556	OMP_CLAUSE__SIMT_,
557
558	/* OpenACC clause: independent. */
559	OMP_CLAUSE_INDEPENDENT,
560
561	/* OpenACC clause: worker [( [num:] integer-expression)]. */
562	OMP_CLAUSE_WORKER,
563
564	/* OpenACC clause: vector [( [length:] integer-expression)]. */
565	OMP_CLAUSE_VECTOR,
566
567	/* OpenACC clause: num_gangs (integer-expression). */
568	OMP_CLAUSE_NUM_GANGS,
569
570	/* OpenACC clause: num_workers (integer-expression). */
571	OMP_CLAUSE_NUM_WORKERS,
572
573	/* OpenACC clause: vector_length (integer-expression). */
574	OMP_CLAUSE_VECTOR_LENGTH,
575
576	/* OpenACC clause: tile ( size-expr-list ). */
577	OMP_CLAUSE_TILE,
578
579	/* OpenACC clause: if_present. */
580	OMP_CLAUSE_IF_PRESENT,
581
582	/* OpenACC clause: finalize. */
583	OMP_CLAUSE_FINALIZE,
584
585	/* OpenACC clause: nohost. */
586	OMP_CLAUSE_NOHOST,
587
588	/* OpenMP clause: novariants (scalar-expression). */
589	OMP_CLAUSE_NOVARIANTS,
590
591	/* OpenMP clause: nocontext (scalar-expression). */
592	OMP_CLAUSE_NOCONTEXT,
593
594	};
595
596	#undef DEFTREESTRUCT
597	#define DEFTREESTRUCT(ENUM, NAME) ENUM,
598	enum tree_node_structure_enum {
599	#include "treestruct.def"
600	LAST_TS_ENUM
601	};
602	#undef DEFTREESTRUCT
603
604	enum omp_clause_schedule_kind {
605	OMP_CLAUSE_SCHEDULE_STATIC,
606	OMP_CLAUSE_SCHEDULE_DYNAMIC,
607	OMP_CLAUSE_SCHEDULE_GUIDED,
608	OMP_CLAUSE_SCHEDULE_AUTO,
609	OMP_CLAUSE_SCHEDULE_RUNTIME,
610	OMP_CLAUSE_SCHEDULE_MASK = (1 << 3) - 1,
611	OMP_CLAUSE_SCHEDULE_MONOTONIC = (1 << 3),
612	OMP_CLAUSE_SCHEDULE_NONMONOTONIC = (1 << 4),
613	OMP_CLAUSE_SCHEDULE_LAST = 2 * OMP_CLAUSE_SCHEDULE_NONMONOTONIC - 1
614	};
615
616	enum omp_clause_default_kind {
617	OMP_CLAUSE_DEFAULT_UNSPECIFIED,
618	OMP_CLAUSE_DEFAULT_SHARED,
619	OMP_CLAUSE_DEFAULT_NONE,
620	OMP_CLAUSE_DEFAULT_PRIVATE,
621	OMP_CLAUSE_DEFAULT_FIRSTPRIVATE,
622	OMP_CLAUSE_DEFAULT_PRESENT,
623	OMP_CLAUSE_DEFAULT_LAST
624	};
625
626	enum omp_clause_defaultmap_kind {
627	OMP_CLAUSE_DEFAULTMAP_CATEGORY_UNSPECIFIED,
628	OMP_CLAUSE_DEFAULTMAP_CATEGORY_ALL,
629	OMP_CLAUSE_DEFAULTMAP_CATEGORY_SCALAR,
630	OMP_CLAUSE_DEFAULTMAP_CATEGORY_AGGREGATE,
631	OMP_CLAUSE_DEFAULTMAP_CATEGORY_ALLOCATABLE,
632	OMP_CLAUSE_DEFAULTMAP_CATEGORY_POINTER,
633	OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK = 7,
634	OMP_CLAUSE_DEFAULTMAP_ALLOC = 1 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
635	OMP_CLAUSE_DEFAULTMAP_TO = 2 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
636	OMP_CLAUSE_DEFAULTMAP_FROM = 3 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
637	OMP_CLAUSE_DEFAULTMAP_TOFROM = 4 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
638	OMP_CLAUSE_DEFAULTMAP_FIRSTPRIVATE
639	= 5 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
640	OMP_CLAUSE_DEFAULTMAP_NONE = 6 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
641	OMP_CLAUSE_DEFAULTMAP_DEFAULT
642	= 7 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
643	OMP_CLAUSE_DEFAULTMAP_PRESENT = 8 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
644	OMP_CLAUSE_DEFAULTMAP_MASK = 15 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1)
645	};
646
647	enum omp_clause_bind_kind {
648	OMP_CLAUSE_BIND_TEAMS,
649	OMP_CLAUSE_BIND_PARALLEL,
650	OMP_CLAUSE_BIND_THREAD
651	};
652
653	/* memory-order-clause on OpenMP atomic/flush constructs or
654	argument of atomic_default_mem_order clause. */
655	enum omp_memory_order {
656	OMP_MEMORY_ORDER_UNSPECIFIED,
657	OMP_MEMORY_ORDER_RELAXED,
658	OMP_MEMORY_ORDER_ACQUIRE,
659	OMP_MEMORY_ORDER_RELEASE,
660	OMP_MEMORY_ORDER_ACQ_REL,
661	OMP_MEMORY_ORDER_SEQ_CST,
662	OMP_MEMORY_ORDER_MASK = 7,
663	OMP_FAIL_MEMORY_ORDER_UNSPECIFIED = OMP_MEMORY_ORDER_UNSPECIFIED * 8,
664	OMP_FAIL_MEMORY_ORDER_RELAXED = OMP_MEMORY_ORDER_RELAXED * 8,
665	OMP_FAIL_MEMORY_ORDER_ACQUIRE = OMP_MEMORY_ORDER_ACQUIRE * 8,
666	OMP_FAIL_MEMORY_ORDER_RELEASE = OMP_MEMORY_ORDER_RELEASE * 8,
667	OMP_FAIL_MEMORY_ORDER_ACQ_REL = OMP_MEMORY_ORDER_ACQ_REL * 8,
668	OMP_FAIL_MEMORY_ORDER_SEQ_CST = OMP_MEMORY_ORDER_SEQ_CST * 8,
669	OMP_FAIL_MEMORY_ORDER_MASK = OMP_MEMORY_ORDER_MASK * 8
670	};
671	#define OMP_FAIL_MEMORY_ORDER_SHIFT 3
672
673	/* There is a TYPE_QUAL value for each type qualifier. They can be
674	combined by bitwise-or to form the complete set of qualifiers for a
675	type. */
676	enum cv_qualifier {
677	TYPE_UNQUALIFIED = 0x0,
678	TYPE_QUAL_CONST = 0x1,
679	TYPE_QUAL_VOLATILE = 0x2,
680	TYPE_QUAL_RESTRICT = 0x4,
681	TYPE_QUAL_ATOMIC = 0x8
682	};
683
684	/* Standard named or nameless data types of the C compiler. */
685	enum tree_index : unsigned {
686	TI_ERROR_MARK,
687	TI_INTQI_TYPE,
688	TI_INTHI_TYPE,
689	TI_INTSI_TYPE,
690	TI_INTDI_TYPE,
691	TI_INTTI_TYPE,
692
693	TI_UINTQI_TYPE,
694	TI_UINTHI_TYPE,
695	TI_UINTSI_TYPE,
696	TI_UINTDI_TYPE,
697	TI_UINTTI_TYPE,
698
699	TI_ATOMICQI_TYPE,
700	TI_ATOMICHI_TYPE,
701	TI_ATOMICSI_TYPE,
702	TI_ATOMICDI_TYPE,
703	TI_ATOMICTI_TYPE,
704
705	TI_UINT16_TYPE,
706	TI_UINT32_TYPE,
707	TI_UINT64_TYPE,
708	TI_UINT128_TYPE,
709
710	TI_VOID,
711
712	TI_INTEGER_ZERO,
713	TI_INTEGER_ONE,
714	TI_INTEGER_MINUS_ONE,
715	TI_NULL_POINTER,
716
717	TI_SIZE_ZERO,
718	TI_SIZE_ONE,
719
720	TI_BITSIZE_ZERO,
721	TI_BITSIZE_ONE,
722	TI_BITSIZE_UNIT,
723
724	TI_PUBLIC,
725	TI_PROTECTED,
726	TI_PRIVATE,
727
728	TI_BOOLEAN_FALSE,
729	TI_BOOLEAN_TRUE,
730
731	TI_FLOAT_TYPE,
732	TI_DOUBLE_TYPE,
733	TI_LONG_DOUBLE_TYPE,
734
735	/* __bf16 type if supported (used in C++ as std::bfloat16_t). */
736	TI_BFLOAT16_TYPE,
737
738	/* The _FloatN and _FloatNx types must be consecutive, and in the
739	same sequence as the corresponding complex types, which must also
740	be consecutive; _FloatN must come before _FloatNx; the order must
741	also be the same as in the floatn_nx_types array and the RID_*
742	values in c-common.h. This is so that iterations over these
743	types work as intended. */
744	TI_FLOAT16_TYPE,
745	TI_FLOATN_TYPE_FIRST = TI_FLOAT16_TYPE,
746	TI_FLOATN_NX_TYPE_FIRST = TI_FLOAT16_TYPE,
747	TI_FLOAT32_TYPE,
748	TI_FLOAT64_TYPE,
749	TI_FLOAT128_TYPE,
750	TI_FLOATN_TYPE_LAST = TI_FLOAT128_TYPE,
751	#define NUM_FLOATN_TYPES ((int) (TI_FLOATN_TYPE_LAST \
752	- TI_FLOATN_TYPE_FIRST + 1))
753	TI_FLOAT32X_TYPE,
754	TI_FLOATNX_TYPE_FIRST = TI_FLOAT32X_TYPE,
755	TI_FLOAT64X_TYPE,
756	TI_FLOAT128X_TYPE,
757	TI_FLOATNX_TYPE_LAST = TI_FLOAT128X_TYPE,
758	TI_FLOATN_NX_TYPE_LAST = TI_FLOAT128X_TYPE,
759	#define NUM_FLOATNX_TYPES ((int) (TI_FLOATNX_TYPE_LAST \
760	- TI_FLOATNX_TYPE_FIRST + 1))
761	#define NUM_FLOATN_NX_TYPES ((int) (TI_FLOATN_NX_TYPE_LAST \
762	- TI_FLOATN_NX_TYPE_FIRST + 1))
763
764	/* Type used by certain backends for __float128, which in C++ should be
765	distinct type from _Float128 for backwards compatibility reasons. */
766	TI_FLOAT128T_TYPE,
767
768	/* Put the complex types after their component types, so that in (sequential)
769	tree streaming we can assert that their component types have already been
770	handled (see tree-streamer.cc:record_common_node). */
771	TI_COMPLEX_INTEGER_TYPE,
772	TI_COMPLEX_FLOAT_TYPE,
773	TI_COMPLEX_DOUBLE_TYPE,
774	TI_COMPLEX_LONG_DOUBLE_TYPE,
775
776	TI_COMPLEX_FLOAT16_TYPE,
777	TI_COMPLEX_FLOATN_NX_TYPE_FIRST = TI_COMPLEX_FLOAT16_TYPE,
778	TI_COMPLEX_FLOAT32_TYPE,
779	TI_COMPLEX_FLOAT64_TYPE,
780	TI_COMPLEX_FLOAT128_TYPE,
781	TI_COMPLEX_FLOAT32X_TYPE,
782	TI_COMPLEX_FLOAT64X_TYPE,
783	TI_COMPLEX_FLOAT128X_TYPE,
784
785	TI_FLOAT_PTR_TYPE,
786	TI_DOUBLE_PTR_TYPE,
787	TI_LONG_DOUBLE_PTR_TYPE,
788	TI_INTEGER_PTR_TYPE,
789
790	TI_VOID_TYPE,
791	TI_PTR_TYPE,
792	TI_CONST_PTR_TYPE,
793	TI_SIZE_TYPE,
794	TI_PID_TYPE,
795	TI_PTRDIFF_TYPE,
796	TI_VA_LIST_TYPE,
797	TI_VA_LIST_GPR_COUNTER_FIELD,
798	TI_VA_LIST_FPR_COUNTER_FIELD,
799	TI_BOOLEAN_TYPE,
800	TI_FILEPTR_TYPE,
801	TI_CONST_TM_PTR_TYPE,
802	TI_FENV_T_PTR_TYPE,
803	TI_CONST_FENV_T_PTR_TYPE,
804	TI_FEXCEPT_T_PTR_TYPE,
805	TI_CONST_FEXCEPT_T_PTR_TYPE,
806	TI_POINTER_SIZED_TYPE,
807
808	TI_DFLOAT32_TYPE,
809	TI_DFLOAT64_TYPE,
810	TI_DFLOAT128_TYPE,
811	TI_DFLOAT64X_TYPE,
812
813	TI_VOID_LIST_NODE,
814
815	TI_MAIN_IDENTIFIER,
816
817	TI_SAT_SFRACT_TYPE,
818	TI_SAT_FRACT_TYPE,
819	TI_SAT_LFRACT_TYPE,
820	TI_SAT_LLFRACT_TYPE,
821	TI_SAT_USFRACT_TYPE,
822	TI_SAT_UFRACT_TYPE,
823	TI_SAT_ULFRACT_TYPE,
824	TI_SAT_ULLFRACT_TYPE,
825	TI_SFRACT_TYPE,
826	TI_FRACT_TYPE,
827	TI_LFRACT_TYPE,
828	TI_LLFRACT_TYPE,
829	TI_USFRACT_TYPE,
830	TI_UFRACT_TYPE,
831	TI_ULFRACT_TYPE,
832	TI_ULLFRACT_TYPE,
833	TI_SAT_SACCUM_TYPE,
834	TI_SAT_ACCUM_TYPE,
835	TI_SAT_LACCUM_TYPE,
836	TI_SAT_LLACCUM_TYPE,
837	TI_SAT_USACCUM_TYPE,
838	TI_SAT_UACCUM_TYPE,
839	TI_SAT_ULACCUM_TYPE,
840	TI_SAT_ULLACCUM_TYPE,
841	TI_SACCUM_TYPE,
842	TI_ACCUM_TYPE,
843	TI_LACCUM_TYPE,
844	TI_LLACCUM_TYPE,
845	TI_USACCUM_TYPE,
846	TI_UACCUM_TYPE,
847	TI_ULACCUM_TYPE,
848	TI_ULLACCUM_TYPE,
849	TI_QQ_TYPE,
850	TI_HQ_TYPE,
851	TI_SQ_TYPE,
852	TI_DQ_TYPE,
853	TI_TQ_TYPE,
854	TI_UQQ_TYPE,
855	TI_UHQ_TYPE,
856	TI_USQ_TYPE,
857	TI_UDQ_TYPE,
858	TI_UTQ_TYPE,
859	TI_SAT_QQ_TYPE,
860	TI_SAT_HQ_TYPE,
861	TI_SAT_SQ_TYPE,
862	TI_SAT_DQ_TYPE,
863	TI_SAT_TQ_TYPE,
864	TI_SAT_UQQ_TYPE,
865	TI_SAT_UHQ_TYPE,
866	TI_SAT_USQ_TYPE,
867	TI_SAT_UDQ_TYPE,
868	TI_SAT_UTQ_TYPE,
869	TI_HA_TYPE,
870	TI_SA_TYPE,
871	TI_DA_TYPE,
872	TI_TA_TYPE,
873	TI_UHA_TYPE,
874	TI_USA_TYPE,
875	TI_UDA_TYPE,
876	TI_UTA_TYPE,
877	TI_SAT_HA_TYPE,
878	TI_SAT_SA_TYPE,
879	TI_SAT_DA_TYPE,
880	TI_SAT_TA_TYPE,
881	TI_SAT_UHA_TYPE,
882	TI_SAT_USA_TYPE,
883	TI_SAT_UDA_TYPE,
884	TI_SAT_UTA_TYPE,
885
886	TI_MODULE_HWM,
887	/* Nodes below here change during compilation, and should therefore
888	not be in the C++ module's global tree table. */
889
890	TI_OPTIMIZATION_DEFAULT,
891	TI_OPTIMIZATION_CURRENT,
892	TI_TARGET_OPTION_DEFAULT,
893	TI_TARGET_OPTION_CURRENT,
894	TI_CURRENT_TARGET_PRAGMA,
895	TI_CURRENT_OPTIMIZE_PRAGMA,
896
897	TI_CHREC_DONT_KNOW,
898	TI_CHREC_KNOWN,
899
900	TI_MAX
901	};
902
903	/* An enumeration of the standard C integer types. These must be
904	ordered so that shorter types appear before longer ones, and so
905	that signed types appear before unsigned ones, for the correct
906	functioning of interpret_integer() in c-lex.cc. */
907	enum integer_type_kind {
908	itk_char,
909	itk_signed_char,
910	itk_unsigned_char,
911	itk_short,
912	itk_unsigned_short,
913	itk_int,
914	itk_unsigned_int,
915	itk_long,
916	itk_unsigned_long,
917	itk_long_long,
918	itk_unsigned_long_long,
919
920	itk_intN_0,
921	itk_unsigned_intN_0,
922	itk_intN_1,
923	itk_unsigned_intN_1,
924	itk_intN_2,
925	itk_unsigned_intN_2,
926	itk_intN_3,
927	itk_unsigned_intN_3,
928
929	itk_none
930	};
931
932	/* A pointer-to-function member type looks like:
933
934	struct {
935	__P __pfn;
936	ptrdiff_t __delta;
937	};
938
939	If __pfn is NULL, it is a NULL pointer-to-member-function.
940
941	(Because the vtable is always the first thing in the object, we
942	don't need its offset.) If the function is virtual, then PFN is
943	one plus twice the index into the vtable; otherwise, it is just a
944	pointer to the function.
945
946	Unfortunately, using the lowest bit of PFN doesn't work in
947	architectures that don't impose alignment requirements on function
948	addresses, or that use the lowest bit to tell one ISA from another,
949	for example. For such architectures, we use the lowest bit of
950	DELTA instead of the lowest bit of the PFN, and DELTA will be
951	multiplied by 2. */
952	enum ptrmemfunc_vbit_where_t {
953	ptrmemfunc_vbit_in_pfn,
954	ptrmemfunc_vbit_in_delta
955	};
956
957	/* Flags that may be passed in the third argument of decl_attributes, and
958	to handler functions for attributes. */
959	enum attribute_flags {
960	/* The type passed in is the type of a DECL, and any attributes that
961	should be passed in again to be applied to the DECL rather than the
962	type should be returned. */
963	ATTR_FLAG_DECL_NEXT = 1,
964	/* The type passed in is a function return type, and any attributes that
965	should be passed in again to be applied to the function type rather
966	than the return type should be returned. */
967	ATTR_FLAG_FUNCTION_NEXT = 2,
968	/* The type passed in is an array element type, and any attributes that
969	should be passed in again to be applied to the array type rather
970	than the element type should be returned. */
971	ATTR_FLAG_ARRAY_NEXT = 4,
972	/* The type passed in is a structure, union or enumeration type being
973	created, and should be modified in place. */
974	ATTR_FLAG_TYPE_IN_PLACE = 8,
975	/* The attributes are being applied by default to a library function whose
976	name indicates known behavior, and should be silently ignored if they
977	are not in fact compatible with the function type. */
978	ATTR_FLAG_BUILT_IN = 16,
979	/* A given attribute has been parsed as a C++-11 attribute. */
980	ATTR_FLAG_CXX11 = 32,
981	/* The attribute handler is being invoked with an internal argument
982	that may not otherwise be valid when specified in source code. */
983	ATTR_FLAG_INTERNAL = 64
984	};
985
986	/* Types used to represent sizes. */
987	enum size_type_kind {
988	stk_sizetype, /* Normal representation of sizes in bytes. */
989	stk_ssizetype, /* Signed representation of sizes in bytes. */
990	stk_bitsizetype, /* Normal representation of sizes in bits. */
991	stk_sbitsizetype, /* Signed representation of sizes in bits. */
992	stk_type_kind_last
993	};
994
995	/* Flags controlling operand_equal_p() behavior. */
996	enum operand_equal_flag {
997	OEP_ONLY_CONST = 1,
998	OEP_PURE_SAME = 2,
999	OEP_MATCH_SIDE_EFFECTS = 4,
1000	OEP_ADDRESS_OF = 8,
1001	/* Internal within operand_equal_p: */
1002	OEP_NO_HASH_CHECK = 16,
1003	/* Internal within inchash::add_expr: */
1004	OEP_HASH_CHECK = 32,
1005	/* Makes operand_equal_p handle more expressions: */
1006	OEP_LEXICOGRAPHIC = 64,
1007	OEP_BITWISE = 128,
1008	/* For OEP_ADDRESS_OF of COMPONENT_REFs, only consider same fields as
1009	equivalent rather than also different fields with the same offset. */
1010	OEP_ADDRESS_OF_SAME_FIELD = 256,
1011	/* In conjunction with OEP_LEXICOGRAPHIC considers names of declarations
1012	of the same kind. Used to compare VLA bounds involving parameters
1013	across redeclarations of the same function. */
1014	OEP_DECL_NAME = 512,
1015	/* Check if two expressions result in the same bit values while possibly
1016	ignoring the sign of the expressions and any differences in undefined
1017	behaviour. The compared expressions must however perform the same
1018	operations. Because this comparison ignores any possible UB it cannot
1019	be used blindly without ensuring that the context you are using it in
1020	itself doesn't guarantee that there will be no UB. */
1021	OEP_ASSUME_WRAPV = 1024
1022	};
1023
1024	/* Enum and arrays used for tree allocation stats.
1025	Keep in sync with tree.cc:tree_node_kind_names. */
1026	enum tree_node_kind {
1027	d_kind,
1028	t_kind,
1029	b_kind,
1030	s_kind,
1031	r_kind,
1032	e_kind,
1033	c_kind,
1034	id_kind,
1035	vec_kind,
1036	binfo_kind,
1037	ssa_name_kind,
1038	constr_kind,
1039	x_kind,
1040	lang_decl,
1041	lang_type,
1042	omp_clause_kind,
1043	all_kinds
1044	};
1045
1046	enum annot_expr_kind {
1047	annot_expr_ivdep_kind,
1048	annot_expr_unroll_kind,
1049	annot_expr_no_vector_kind,
1050	annot_expr_vector_kind,
1051	annot_expr_parallel_kind,
1052	annot_expr_maybe_infinite_kind,
1053	annot_expr_kind_last
1054	};
1055
1056	/* The kind of a TREE_CLOBBER_P CONSTRUCTOR node. Other than _UNDEF, these are
1057	in roughly sequential order. */
1058	enum clobber_kind {
1059	/* Unspecified, this clobber acts as a store of an undefined value. */
1060	CLOBBER_UNDEF,
1061	/* Beginning of storage duration, e.g. malloc. */
1062	CLOBBER_STORAGE_BEGIN,
1063	/* Beginning of object data, e.g. start of C++ constructor. This differs
1064	from C++ 'lifetime', which starts when initialization is complete; a
1065	clobber there would discard the initialization. */
1066	CLOBBER_OBJECT_BEGIN,
1067	/* End of object data, e.g. end of C++ destructor. */
1068	CLOBBER_OBJECT_END,
1069	/* End of storage duration, e.g. free. */
1070	CLOBBER_STORAGE_END,
1071	CLOBBER_LAST
1072	};
1073
1074	/*---------------------------------------------------------------------------
1075	Type definitions
1076	---------------------------------------------------------------------------*/
1077	/* When processing aliases at the symbol table level, we need the
1078	declaration of target. For this reason we need to queue aliases and
1079	process them after all declarations has been produced. */
1080	struct GTY(()) alias_pair {
1081	tree decl;
1082	tree target;
1083	};
1084
1085	/* An initialization priority. */
1086	typedef unsigned short priority_type;
1087
1088	/* The type of a callback function for walking over tree structure. */
1089	typedef tree (*walk_tree_fn) (tree *, int *, void *);
1090
1091	/* The type of a callback function that represents a custom walk_tree. */
1092	typedef tree (*walk_tree_lh) (tree *, int *, tree (*) (tree *, int *, void *),
1093	void *, hash_set<tree> *);
1094
1095
1096	/*---------------------------------------------------------------------------
1097	Main data structures
1098	---------------------------------------------------------------------------*/
1099	/* A tree node can represent a data type, a variable, an expression
1100	or a statement. Each node has a TREE_CODE which says what kind of
1101	thing it represents. Some common codes are:
1102	INTEGER_TYPE -- represents a type of integers.
1103	ARRAY_TYPE -- represents a type of pointer.
1104	VAR_DECL -- represents a declared variable.
1105	INTEGER_CST -- represents a constant integer value.
1106	PLUS_EXPR -- represents a sum (an expression).
1107
1108	As for the contents of a tree node: there are some fields
1109	that all nodes share. Each TREE_CODE has various special-purpose
1110	fields as well. The fields of a node are never accessed directly,
1111	always through accessor macros. */
1112
1113	/* Every kind of tree node starts with this structure,
1114	so all nodes have these fields.
1115
1116	See the accessor macros, defined below, for documentation of the
1117	fields, and the table below which connects the fields and the
1118	accessor macros. */
1119
1120	struct GTY(()) tree_base {
1121	ENUM_BITFIELD(tree_code) code : 16;
1122
1123	unsigned side_effects_flag : 1;
1124	unsigned constant_flag : 1;
1125	unsigned addressable_flag : 1;
1126	unsigned volatile_flag : 1;
1127	unsigned readonly_flag : 1;
1128	unsigned asm_written_flag: 1;
1129	unsigned nowarning_flag : 1;
1130	unsigned visited : 1;
1131
1132	unsigned used_flag : 1;
1133	unsigned nothrow_flag : 1;
1134	unsigned static_flag : 1;
1135	unsigned public_flag : 1;
1136	unsigned private_flag : 1;
1137	unsigned protected_flag : 1;
1138	unsigned deprecated_flag : 1;
1139	unsigned default_def_flag : 1;
1140
1141	union {
1142	/* The bits in the following structure should only be used with
1143	accessor macros that constrain inputs with tree checking. */
1144	struct {
1145	unsigned lang_flag_0 : 1;
1146	unsigned lang_flag_1 : 1;
1147	unsigned lang_flag_2 : 1;
1148	unsigned lang_flag_3 : 1;
1149	unsigned lang_flag_4 : 1;
1150	unsigned lang_flag_5 : 1;
1151	unsigned lang_flag_6 : 1;
1152	unsigned saturating_flag : 1;
1153
1154	unsigned unsigned_flag : 1;
1155	unsigned packed_flag : 1;
1156	unsigned user_align : 1;
1157	unsigned nameless_flag : 1;
1158	unsigned atomic_flag : 1;
1159	unsigned unavailable_flag : 1;
1160	unsigned spare0 : 2;
1161
1162	unsigned spare1 : 8;
1163
1164	/* For _TYPE nodes, this is TYPE_ADDR_SPACE; the reason it is
1165	present in tree_base instead of tree_type is to save space. The size
1166	of the field must be large enough to hold addr_space_t values.
1167	For CONSTRUCTOR nodes this holds the clobber_kind enum.
1168	The C++ front-end uses this in IDENTIFIER_NODE and NAMESPACE_DECL. */
1169	unsigned address_space : 8;
1170	} bits;
1171
1172	/* The following fields are present in tree_base to save space. The
1173	nodes using them do not require any of the flags above and so can
1174	make better use of the 4-byte sized word. */
1175
1176	/* The number of HOST_WIDE_INTs in an INTEGER_CST. */
1177	struct {
1178	/* The number of HOST_WIDE_INTs if the INTEGER_CST is accessed in
1179	its native precision. */
1180	unsigned short unextended;
1181
1182	/* The number of HOST_WIDE_INTs if the INTEGER_CST is extended to
1183	wider precisions based on its TYPE_SIGN. */
1184	unsigned short extended;
1185	} int_length;
1186
1187	/* VEC length. This field is only used with TREE_VEC. */
1188	int length;
1189
1190	/* This field is only used with VECTOR_CST. */
1191	struct {
1192	/* The value of VECTOR_CST_LOG2_NPATTERNS. */
1193	unsigned int log2_npatterns : 8;
1194
1195	/* The value of VECTOR_CST_NELTS_PER_PATTERN. */
1196	unsigned int nelts_per_pattern : 8;
1197
1198	/* For future expansion. */
1199	unsigned int unused : 16;
1200	} vector_cst;
1201
1202	/* SSA version number. This field is only used with SSA_NAME. */
1203	unsigned int version;
1204
1205	/* CHREC_VARIABLE. This field is only used with POLYNOMIAL_CHREC. */
1206	unsigned int chrec_var;
1207
1208	/* Internal function code. */
1209	enum internal_fn ifn;
1210
1211	/* OMP_ATOMIC* memory order. */
1212	enum omp_memory_order omp_atomic_memory_order;
1213
1214	/* The following two fields are used for MEM_REF and TARGET_MEM_REF
1215	expression trees and specify known data non-dependences. For
1216	two memory references in a function they are known to not
1217	alias if dependence_info.clique are equal and dependence_info.base
1218	are distinct. Clique number zero means there is no information,
1219	clique number one is populated from function global information
1220	and thus needs no remapping on transforms like loop unrolling. */
1221	struct {
1222	unsigned short clique;
1223	unsigned short base;
1224	} dependence_info;
1225	} GTY((skip(""))) u;
1226	};
1227
1228	/* The following table lists the uses of each of the above flags and
1229	for which types of nodes they are defined.
1230
1231	addressable_flag:
1232
1233	TREE_ADDRESSABLE in
1234	VAR_DECL, PARM_DECL, RESULT_DECL, FUNCTION_DECL, LABEL_DECL
1235	SSA_NAME
1236	all types
1237	CONSTRUCTOR, IDENTIFIER_NODE
1238	STMT_EXPR
1239
1240	CALL_EXPR_TAILCALL in
1241	CALL_EXPR
1242
1243	CASE_LOW_SEEN in
1244	CASE_LABEL_EXPR
1245
1246	PREDICT_EXPR_OUTCOME in
1247	PREDICT_EXPR
1248
1249	OMP_CLAUSE_MAP_DECL_MAKE_ADDRESSABLE in
1250	OMP_CLAUSE
1251
1252	static_flag:
1253
1254	TREE_STATIC in
1255	VAR_DECL, FUNCTION_DECL
1256	CONSTRUCTOR
1257
1258	TREE_NO_TRAMPOLINE in
1259	ADDR_EXPR
1260
1261	BINFO_VIRTUAL_P in
1262	TREE_BINFO
1263
1264	TREE_SYMBOL_REFERENCED in
1265	IDENTIFIER_NODE
1266
1267	CLEANUP_EH_ONLY in
1268	TARGET_EXPR, WITH_CLEANUP_EXPR
1269
1270	TRY_CATCH_IS_CLEANUP in
1271	TRY_CATCH_EXPR
1272
1273	ASM_BASIC_P in
1274	ASM_EXPR
1275
1276	TYPE_REF_CAN_ALIAS_ALL in
1277	POINTER_TYPE, REFERENCE_TYPE
1278
1279	CASE_HIGH_SEEN in
1280	CASE_LABEL_EXPR
1281
1282	ENUM_IS_SCOPED in
1283	ENUMERAL_TYPE
1284
1285	TRANSACTION_EXPR_OUTER in
1286	TRANSACTION_EXPR
1287
1288	MUST_TAIL_CALL in
1289	CALL_EXPR
1290
1291	public_flag:
1292
1293	TREE_OVERFLOW in
1294	INTEGER_CST, REAL_CST, COMPLEX_CST, VECTOR_CST
1295
1296	TREE_PUBLIC in
1297	VAR_DECL, FUNCTION_DECL
1298	IDENTIFIER_NODE
1299
1300	CONSTRUCTOR_NO_CLEARING in
1301	CONSTRUCTOR
1302
1303	ASM_VOLATILE_P in
1304	ASM_EXPR
1305
1306	CALL_EXPR_VA_ARG_PACK in
1307	CALL_EXPR
1308
1309	TYPE_CACHED_VALUES_P in
1310	all types
1311
1312	SAVE_EXPR_RESOLVED_P in
1313	SAVE_EXPR
1314
1315	OMP_CLAUSE_LASTPRIVATE_FIRSTPRIVATE in
1316	OMP_CLAUSE_LASTPRIVATE
1317
1318	OMP_CLAUSE_PRIVATE_DEBUG in
1319	OMP_CLAUSE_PRIVATE
1320
1321	OMP_CLAUSE_LINEAR_NO_COPYIN in
1322	OMP_CLAUSE_LINEAR
1323
1324	OMP_CLAUSE_MAP_ZERO_BIAS_ARRAY_SECTION in
1325	OMP_CLAUSE_MAP
1326
1327	OMP_CLAUSE_REDUCTION_OMP_ORIG_REF in
1328	OMP_CLAUSE_{,TASK_,IN_}REDUCTION
1329
1330	OMP_CLAUSE_USE_DEVICE_PTR_IF_PRESENT in
1331	OMP_CLAUSE_USE_DEVICE_PTR
1332
1333	TRANSACTION_EXPR_RELAXED in
1334	TRANSACTION_EXPR
1335
1336	FALLTHROUGH_LABEL_P in
1337	LABEL_DECL
1338
1339	SSA_NAME_IS_VIRTUAL_OPERAND in
1340	SSA_NAME
1341
1342	EXPR_LOCATION_WRAPPER_P in
1343	NON_LVALUE_EXPR, VIEW_CONVERT_EXPR
1344
1345	private_flag:
1346
1347	TREE_PRIVATE in
1348	all decls
1349
1350	CALL_EXPR_RETURN_SLOT_OPT in
1351	CALL_EXPR
1352
1353	OMP_SECTION_LAST in
1354	OMP_SECTION
1355
1356	OMP_PARALLEL_COMBINED in
1357	OMP_PARALLEL
1358
1359	OMP_CLAUSE_PRIVATE_OUTER_REF in
1360	OMP_CLAUSE_PRIVATE
1361
1362	OMP_CLAUSE_LINEAR_NO_COPYOUT in
1363	OMP_CLAUSE_LINEAR
1364
1365	TYPE_REF_IS_RVALUE in
1366	REFERENCE_TYPE
1367
1368	ENUM_IS_OPAQUE in
1369	ENUMERAL_TYPE
1370
1371	protected_flag:
1372
1373	TREE_PROTECTED in
1374	BLOCK
1375	all decls
1376
1377	CALL_FROM_THUNK_P and
1378	CALL_ALLOCA_FOR_VAR_P and
1379	CALL_FROM_NEW_OR_DELETE_P in
1380	CALL_EXPR
1381
1382	OMP_CLAUSE_LINEAR_VARIABLE_STRIDE in
1383	OMP_CLAUSE_LINEAR
1384
1385	ASM_INLINE_P in
1386	ASM_EXPR
1387
1388	side_effects_flag:
1389
1390	TREE_SIDE_EFFECTS in
1391	all expressions
1392	all decls
1393	all constants
1394
1395	FORCED_LABEL in
1396	LABEL_DECL
1397
1398	volatile_flag:
1399
1400	TREE_THIS_VOLATILE in
1401	all expressions
1402	all decls
1403
1404	TYPE_VOLATILE in
1405	all types
1406
1407	readonly_flag:
1408
1409	TREE_READONLY in
1410	all expressions
1411	all decls
1412
1413	TYPE_READONLY in
1414	all types
1415
1416	OMP_CLAUSE_MAP_READONLY in
1417	OMP_CLAUSE_MAP
1418
1419	OMP_CLAUSE__CACHE__READONLY in
1420	OMP_CLAUSE__CACHE_
1421
1422	constant_flag:
1423
1424	TREE_CONSTANT in
1425	all expressions
1426	all decls
1427	all constants
1428
1429	TYPE_SIZES_GIMPLIFIED in
1430	all types
1431
1432	unsigned_flag:
1433
1434	TYPE_UNSIGNED in
1435	all types
1436
1437	DECL_UNSIGNED in
1438	all decls
1439
1440	asm_written_flag:
1441
1442	TREE_ASM_WRITTEN in
1443	VAR_DECL, FUNCTION_DECL, TYPE_DECL
1444	RECORD_TYPE, UNION_TYPE, QUAL_UNION_TYPE
1445	BLOCK, STRING_CST
1446
1447	SSA_NAME_OCCURS_IN_ABNORMAL_PHI in
1448	SSA_NAME
1449
1450	used_flag:
1451
1452	TREE_USED in
1453	all expressions
1454	all decls
1455	IDENTIFIER_NODE
1456
1457	nothrow_flag:
1458
1459	TREE_NOTHROW in
1460	CALL_EXPR
1461	FUNCTION_DECL
1462
1463	TREE_THIS_NOTRAP in
1464	INDIRECT_REF, MEM_REF, TARGET_MEM_REF, ARRAY_REF, ARRAY_RANGE_REF
1465
1466	SSA_NAME_IN_FREE_LIST in
1467	SSA_NAME
1468
1469	DECL_NONALIASED in
1470	VAR_DECL
1471
1472	CHREC_NOWRAP in
1473	POLYNOMIAL_CHREC
1474
1475	deprecated_flag:
1476
1477	TREE_DEPRECATED in
1478	all decls
1479	all types
1480
1481	IDENTIFIER_TRANSPARENT_ALIAS in
1482	IDENTIFIER_NODE
1483
1484	SSA_NAME_POINTS_TO_READONLY_MEMORY in
1485	SSA_NAME
1486
1487	unavailable_flag:
1488
1489	TREE_UNAVAILABLE in
1490	all decls
1491	all types
1492
1493	visited:
1494
1495	TREE_VISITED in
1496	all trees (used liberally by many passes)
1497
1498	saturating_flag:
1499
1500	TYPE_REVERSE_STORAGE_ORDER in
1501	RECORD_TYPE, UNION_TYPE, QUAL_UNION_TYPE, ARRAY_TYPE
1502
1503	TYPE_SATURATING in
1504	other types
1505
1506	VAR_DECL_IS_VIRTUAL_OPERAND in
1507	VAR_DECL
1508
1509	nowarning_flag:
1510
1511	TREE_NO_WARNING in
1512	all expressions
1513	all decls
1514
1515	TYPE_ARTIFICIAL in
1516	all types
1517
1518	default_def_flag:
1519
1520	TYPE_FINAL_P in
1521	RECORD_TYPE, UNION_TYPE and QUAL_UNION_TYPE
1522
1523	TYPE_VECTOR_OPAQUE in
1524	VECTOR_TYPE
1525
1526	SSA_NAME_IS_DEFAULT_DEF in
1527	SSA_NAME
1528
1529	DECL_NONLOCAL_FRAME in
1530	VAR_DECL
1531
1532	REF_REVERSE_STORAGE_ORDER in
1533	BIT_FIELD_REF, MEM_REF
1534
1535	FUNC_ADDR_BY_DESCRIPTOR in
1536	ADDR_EXPR
1537
1538	CALL_EXPR_BY_DESCRIPTOR in
1539	CALL_EXPR
1540
1541	*/
1542
1543	struct GTY(()) tree_typed {
1544	struct tree_base base;
1545	tree type;
1546	};
1547
1548	struct GTY(()) tree_common {
1549	struct tree_typed typed;
1550	tree chain;
1551	};
1552
1553	struct GTY(()) tree_int_cst {
1554	struct tree_typed typed;
1555	HOST_WIDE_INT val[1];
1556	};
1557
1558
1559	struct GTY(()) tree_real_cst {
1560	struct tree_typed typed;
1561	struct real_value value;
1562	};
1563
1564	struct GTY(()) tree_fixed_cst {
1565	struct tree_typed typed;
1566	struct fixed_value * fixed_cst_ptr;
1567	};
1568
1569	struct GTY(()) tree_string {
1570	struct tree_typed typed;
1571	int length;
1572	char str[1];
1573	};
1574
1575	struct GTY((user)) tree_raw_data {
1576	struct tree_typed typed;
1577	tree owner;
1578	const char *str;
1579	int length;
1580	};
1581
1582	struct GTY(()) tree_complex {
1583	struct tree_typed typed;
1584	tree real;
1585	tree imag;
1586	};
1587
1588	struct GTY(()) tree_vector {
1589	struct tree_typed typed;
1590	tree GTY ((length ("vector_cst_encoded_nelts ((tree) &%h)"))) elts[1];
1591	};
1592
1593	struct GTY(()) tree_poly_int_cst {
1594	struct tree_typed typed;
1595	tree coeffs[NUM_POLY_INT_COEFFS];
1596	};
1597
1598	struct GTY(()) tree_identifier {
1599	struct tree_common common;
1600	struct ht_identifier id;
1601	};
1602
1603	struct GTY(()) tree_list {
1604	struct tree_common common;
1605	tree purpose;
1606	tree value;
1607	};
1608
1609	struct GTY(()) tree_vec {
1610	struct tree_common common;
1611	tree GTY ((length ("TREE_VEC_LENGTH ((tree)&%h)"))) a[1];
1612	};
1613
1614	/* A single element of a CONSTRUCTOR. VALUE holds the actual value of the
1615	element. INDEX can optionally design the position of VALUE: in arrays,
1616	it is the index where VALUE has to be placed; in structures, it is the
1617	FIELD_DECL of the member. */
1618	struct GTY(()) constructor_elt {
1619	tree index;
1620	tree value;
1621	};
1622
1623	struct GTY(()) tree_constructor {
1624	struct tree_typed typed;
1625	vec<constructor_elt, va_gc> *elts;
1626	};
1627
1628	enum omp_clause_depend_kind
1629	{
1630	OMP_CLAUSE_DEPEND_IN,
1631	OMP_CLAUSE_DEPEND_OUT,
1632	OMP_CLAUSE_DEPEND_INOUT,
1633	OMP_CLAUSE_DEPEND_MUTEXINOUTSET,
1634	OMP_CLAUSE_DEPEND_INOUTSET,
1635	OMP_CLAUSE_DEPEND_DEPOBJ,
1636	OMP_CLAUSE_DEPEND_INVALID,
1637	OMP_CLAUSE_DEPEND_LAST
1638	};
1639
1640	enum omp_clause_doacross_kind
1641	{
1642	OMP_CLAUSE_DOACROSS_SOURCE,
1643	OMP_CLAUSE_DOACROSS_SINK,
1644	OMP_CLAUSE_DOACROSS_LAST
1645	};
1646
1647	enum omp_clause_proc_bind_kind
1648	{
1649	/* Numbers should match omp_proc_bind_t enum in omp.h. */
1650	OMP_CLAUSE_PROC_BIND_FALSE = 0,
1651	OMP_CLAUSE_PROC_BIND_TRUE = 1,
1652	OMP_CLAUSE_PROC_BIND_PRIMARY = 2,
1653	OMP_CLAUSE_PROC_BIND_MASTER = 2,
1654	OMP_CLAUSE_PROC_BIND_CLOSE = 3,
1655	OMP_CLAUSE_PROC_BIND_SPREAD = 4,
1656	OMP_CLAUSE_PROC_BIND_LAST
1657	};
1658
1659	enum omp_clause_device_type_kind
1660	{
1661	OMP_CLAUSE_DEVICE_TYPE_HOST = 1,
1662	OMP_CLAUSE_DEVICE_TYPE_NOHOST = 2,
1663	OMP_CLAUSE_DEVICE_TYPE_ANY = 3
1664	};
1665
1666	enum omp_clause_linear_kind
1667	{
1668	OMP_CLAUSE_LINEAR_DEFAULT,
1669	OMP_CLAUSE_LINEAR_REF,
1670	OMP_CLAUSE_LINEAR_VAL,
1671	OMP_CLAUSE_LINEAR_UVAL
1672	};
1673
1674	struct GTY(()) tree_exp {
1675	struct tree_typed typed;
1676	location_t locus;
1677	tree GTY ((length ("TREE_OPERAND_LENGTH ((tree)&%h)"))) operands[1];
1678	};
1679
1680	/* Immediate use linking structure. This structure is used for maintaining
1681	a doubly linked list of uses of an SSA_NAME. */
1682	struct GTY(()) ssa_use_operand_t {
1683	struct ssa_use_operand_t* GTY((skip(""))) prev;
1684	struct ssa_use_operand_t* GTY((skip(""))) next;
1685	/* Immediate uses for a given SSA name are maintained as a cyclic
1686	list. To recognize the root of this list, the location field
1687	needs to point to the original SSA name. Since statements and
1688	SSA names are of different data types, we need this union. See
1689	the explanation in struct imm_use_iterator. */
1690	union { gimple *stmt; tree ssa_name; } GTY((skip(""))) loc;
1691	tree *GTY((skip(""))) use;
1692	};
1693
1694	struct GTY(()) tree_ssa_name {
1695	struct tree_typed typed;
1696
1697	/* _DECL wrapped by this SSA name. */
1698	tree var;
1699
1700	/* Statement that defines this SSA name. */
1701	gimple *def_stmt;
1702
1703	/* Value range information. */
1704	union ssa_name_info_type {
1705	/* Range and aliasing info for pointers. */
1706	struct GTY ((tag ("0"))) ptr_info_def *ptr_info;
1707	/* Range info for everything else. */
1708	struct GTY ((tag ("1"))) vrange_storage * range_info;
1709	} GTY ((desc ("%1.typed.type ?" \
1710	"!POINTER_TYPE_P (TREE_TYPE ((tree)&%1)) : 2"))) info;
1711	/* Immediate uses list for this SSA_NAME. */
1712	struct ssa_use_operand_t imm_uses;
1713	};
1714
1715	struct GTY(()) phi_arg_d {
1716	/* imm_use MUST be the first element in struct because we do some
1717	pointer arithmetic with it. See phi_arg_index_from_use. */
1718	struct ssa_use_operand_t imm_use;
1719	tree def;
1720	location_t locus;
1721	};
1722
1723	struct GTY(()) tree_omp_clause {
1724	struct tree_common common;
1725	location_t locus;
1726	enum omp_clause_code code;
1727	union omp_clause_subcode {
1728	enum omp_clause_default_kind default_kind;
1729	enum omp_clause_schedule_kind schedule_kind;
1730	enum omp_clause_depend_kind depend_kind;
1731	enum omp_clause_doacross_kind doacross_kind;
1732	/* See include/gomp-constants.h for enum gomp_map_kind's values. */
1733	unsigned int map_kind;
1734	enum omp_clause_proc_bind_kind proc_bind_kind;
1735	enum tree_code reduction_code;
1736	enum omp_clause_linear_kind linear_kind;
1737	enum tree_code if_modifier;
1738	enum omp_clause_defaultmap_kind defaultmap_kind;
1739	enum omp_clause_bind_kind bind_kind;
1740	enum omp_clause_device_type_kind device_type_kind;
1741	} GTY ((skip)) subcode;
1742
1743	/* The gimplification of OMP_CLAUSE_REDUCTION_{INIT,MERGE} for omp-low's
1744	usage. */
1745	gimple_seq gimple_reduction_init;
1746	gimple_seq gimple_reduction_merge;
1747
1748	tree GTY ((length ("omp_clause_num_ops[OMP_CLAUSE_CODE ((tree)&%h)]")))
1749	ops[1];
1750	};
1751
1752	struct GTY(()) tree_block {
1753	struct tree_base base;
1754	tree chain;
1755
1756	unsigned block_num;
1757
1758	location_t locus;
1759	location_t end_locus;
1760
1761	tree vars;
1762	vec<tree, va_gc> *nonlocalized_vars;
1763
1764	tree subblocks;
1765	tree supercontext;
1766	tree abstract_origin;
1767	tree fragment_origin;
1768	tree fragment_chain;
1769
1770	/* Pointer to the DWARF lexical block. */
1771	struct die_struct *die;
1772	};
1773
1774	struct GTY(()) tree_type_common {
1775	struct tree_common common;
1776	tree size;
1777	tree size_unit;
1778	tree attributes;
1779	unsigned int uid;
1780
1781	ENUM_BITFIELD(machine_mode) mode : MACHINE_MODE_BITSIZE;
1782
1783	unsigned int precision : 16;
1784	unsigned lang_flag_0 : 1;
1785	unsigned lang_flag_1 : 1;
1786	unsigned lang_flag_2 : 1;
1787	unsigned lang_flag_3 : 1;
1788	unsigned lang_flag_4 : 1;
1789	unsigned lang_flag_5 : 1;
1790	unsigned lang_flag_6 : 1;
1791	unsigned lang_flag_7 : 1;
1792
1793	/* TYPE_ALIGN in log2; this has to be large enough to hold values
1794	of the maximum of BIGGEST_ALIGNMENT and MAX_OFILE_ALIGNMENT,
1795	the latter being usually the larger. For ELF it is 8<<28,
1796	so we need to store the value 32 (not 31, as we need the zero
1797	as well), hence six bits. */
1798	unsigned align : 6;
1799	/* TYPE_STRING_FLAG for INTEGER_TYPE and ARRAY_TYPE.
1800	TYPE_CXX_ODR_P for RECORD_TYPE and UNION_TYPE. */
1801	unsigned string_flag : 1;
1802	unsigned no_force_blk_flag : 1;
1803
1804	unsigned warn_if_not_align : 6;
1805	unsigned needs_constructing_flag : 1;
1806	unsigned transparent_aggr_flag : 1;
1807
1808	unsigned contains_placeholder_bits : 2;
1809	unsigned restrict_flag : 1;
1810	unsigned typeless_storage : 1;
1811	unsigned empty_flag : 1;
1812	unsigned indivisible_p : 1;
1813	/* TYPE_NO_NAMED_ARGS_STDARG_P for a stdarg function.
1814	Or TYPE_INCLUDES_FLEXARRAY for RECORD_TYPE and UNION_TYPE. */
1815	unsigned no_named_args_stdarg_p : 1;
1816	unsigned spare : 1;
1817
1818	alias_set_type alias_set;
1819	tree pointer_to;
1820	tree reference_to;
1821	union tree_type_symtab {
1822	int GTY ((tag ("TYPE_SYMTAB_IS_ADDRESS"))) address;
1823	struct die_struct * GTY ((tag ("TYPE_SYMTAB_IS_DIE"))) die;
1824	} GTY ((desc ("debug_hooks->tree_type_symtab_field"))) symtab;
1825	tree canonical;
1826	tree next_variant;
1827	tree main_variant;
1828	tree context;
1829	tree name;
1830	};
1831
1832	struct GTY(()) tree_type_with_lang_specific {
1833	struct tree_type_common common;
1834	/* Points to a structure whose details depend on the language in use. */
1835	struct lang_type *lang_specific;
1836	};
1837
1838	struct GTY(()) tree_type_non_common {
1839	struct tree_type_with_lang_specific with_lang_specific;
1840	tree values;
1841	tree minval;
1842	tree maxval;
1843	tree lang_1;
1844	};
1845
1846	struct GTY (()) tree_binfo {
1847	struct tree_common common;
1848
1849	tree offset;
1850	tree vtable;
1851	tree virtuals;
1852	tree vptr_field;
1853	vec<tree, va_gc> *base_accesses;
1854	tree inheritance;
1855
1856	tree vtt_subvtt;
1857	tree vtt_vptr;
1858
1859	vec<tree, va_gc> base_binfos;
1860	};
1861
1862	struct GTY(()) tree_decl_minimal {
1863	struct tree_common common;
1864	location_t locus;
1865	unsigned int uid;
1866	tree name;
1867	tree context;
1868	};
1869
1870	struct GTY(()) tree_decl_common {
1871	struct tree_decl_minimal common;
1872	tree size;
1873
1874	ENUM_BITFIELD(machine_mode) mode : MACHINE_MODE_BITSIZE;
1875
1876	unsigned nonlocal_flag : 1;
1877	unsigned virtual_flag : 1;
1878	unsigned ignored_flag : 1;
1879	unsigned abstract_flag : 1;
1880	unsigned artificial_flag : 1;
1881	unsigned preserve_flag: 1;
1882	unsigned debug_expr_is_from : 1;
1883
1884	unsigned lang_flag_0 : 1;
1885	unsigned lang_flag_1 : 1;
1886	unsigned lang_flag_2 : 1;
1887	unsigned lang_flag_3 : 1;
1888	unsigned lang_flag_4 : 1;
1889	unsigned lang_flag_5 : 1;
1890	unsigned lang_flag_6 : 1;
1891	unsigned lang_flag_7 : 1;
1892	unsigned lang_flag_8 : 1;
1893
1894	/* In VAR_DECL and PARM_DECL, this is DECL_REGISTER
1895	In TRANSLATION_UNIT_DECL, this is TRANSLATION_UNIT_WARN_EMPTY_P.
1896	In FIELD_DECL, this is DECL_FIELD_ABI_IGNORED. */
1897	unsigned decl_flag_0 : 1;
1898	/* In FIELD_DECL, this is DECL_BIT_FIELD
1899	In VAR_DECL and FUNCTION_DECL, this is DECL_EXTERNAL.
1900	In TYPE_DECL, this is TYPE_DECL_SUPPRESS_DEBUG. */
1901	unsigned decl_flag_1 : 1;
1902	/* In FIELD_DECL, this is DECL_NONADDRESSABLE_P
1903	In VAR_DECL, PARM_DECL and RESULT_DECL, this is
1904	DECL_HAS_VALUE_EXPR_P. */
1905	unsigned decl_flag_2 : 1;
1906	/* In FIELD_DECL, this is DECL_PADDING_P.
1907	In VAR_DECL, this is DECL_MERGEABLE. */
1908	unsigned decl_flag_3 : 1;
1909	/* Logically, these two would go in a theoretical base shared by var and
1910	parm decl. */
1911	unsigned not_gimple_reg_flag : 1;
1912	/* In VAR_DECL, PARM_DECL and RESULT_DECL, this is DECL_BY_REFERENCE. */
1913	unsigned decl_by_reference_flag : 1;
1914	/* In a VAR_DECL and PARM_DECL, this is DECL_READ_P. */
1915	unsigned decl_read_flag : 1;
1916	/* In a VAR_DECL or RESULT_DECL, this is DECL_NONSHAREABLE. */
1917	/* In a PARM_DECL, this is DECL_HIDDEN_STRING_LENGTH. */
1918	unsigned decl_nonshareable_flag : 1;
1919
1920	/* DECL_OFFSET_ALIGN, used only for FIELD_DECLs. */
1921	unsigned int off_align : 6;
1922
1923	/* DECL_ALIGN. It should have the same size as TYPE_ALIGN. */
1924	unsigned int align : 6;
1925
1926	/* DECL_WARN_IF_NOT_ALIGN. It should have the same size as
1927	TYPE_WARN_IF_NOT_ALIGN. */
1928	unsigned int warn_if_not_align : 6;
1929
1930	/* In FIELD_DECL, this is DECL_NOT_FLEXARRAY. */
1931	unsigned int decl_not_flexarray : 1;
1932
1933	/* 5 bits unused. */
1934
1935	/* UID for points-to sets, stable over copying from inlining. */
1936	unsigned int pt_uid;
1937
1938	tree size_unit;
1939	tree initial;
1940	tree attributes;
1941	tree abstract_origin;
1942
1943	/* Points to a structure whose details depend on the language in use. */
1944	struct lang_decl *lang_specific;
1945	};
1946
1947	struct GTY(()) tree_decl_with_rtl {
1948	struct tree_decl_common common;
1949	rtx rtl;
1950	};
1951
1952	struct GTY(()) tree_field_decl {
1953	struct tree_decl_common common;
1954
1955	tree offset;
1956	tree bit_field_type;
1957	tree qualifier;
1958	tree bit_offset;
1959	tree fcontext;
1960	};
1961
1962	struct GTY(()) tree_label_decl {
1963	struct tree_decl_with_rtl common;
1964	int label_decl_uid;
1965	int eh_landing_pad_nr;
1966	};
1967
1968	struct GTY(()) tree_result_decl {
1969	struct tree_decl_with_rtl common;
1970	};
1971
1972	struct GTY(()) tree_const_decl {
1973	struct tree_decl_common common;
1974	};
1975
1976	struct GTY(()) tree_parm_decl {
1977	struct tree_decl_with_rtl common;
1978	rtx incoming_rtl;
1979	};
1980
1981	struct GTY(()) tree_decl_with_vis {
1982	struct tree_decl_with_rtl common;
1983	tree assembler_name;
1984	struct symtab_node *symtab_node;
1985
1986	/* Belong to VAR_DECL exclusively. */
1987	unsigned defer_output : 1;
1988	unsigned hard_register : 1;
1989	unsigned common_flag : 1;
1990	unsigned in_text_section : 1;
1991	unsigned in_constant_pool : 1;
1992	unsigned dllimport_flag : 1;
1993	/* Don't belong to VAR_DECL exclusively. */
1994	unsigned weak_flag : 1;
1995
1996	unsigned seen_in_bind_expr : 1;
1997	unsigned comdat_flag : 1;
1998	/* Used for FUNCTION_DECL, VAR_DECL and in C++ for TYPE_DECL. */
1999	ENUM_BITFIELD(symbol_visibility) visibility : 2;
2000	unsigned visibility_specified : 1;
2001
2002	/* Belong to FUNCTION_DECL exclusively. */
2003	unsigned init_priority_p : 1;
2004	/* Used by C++ only. Might become a generic decl flag. */
2005	unsigned shadowed_for_var_p : 1;
2006	/* Belong to FUNCTION_DECL exclusively. */
2007	unsigned cxx_constructor : 1;
2008	/* Belong to FUNCTION_DECL exclusively. */
2009	unsigned cxx_destructor : 1;
2010	/* Belong to FUNCTION_DECL exclusively. */
2011	unsigned final : 1;
2012	/* Belong to FUNCTION_DECL exclusively. */
2013	unsigned regdecl_flag : 1;
2014	/* 14 unused bits. */
2015	/* 32 more unused on 64 bit HW. */
2016	};
2017
2018	struct GTY(()) tree_var_decl {
2019	struct tree_decl_with_vis common;
2020	};
2021
2022	struct GTY(()) tree_decl_non_common {
2023	struct tree_decl_with_vis common;
2024	/* Almost all FE's use this. */
2025	tree result;
2026	};
2027
2028	/* Classify a special function declaration type. */
2029
2030	enum class function_decl_type : unsigned
2031	{
2032	NONE,
2033	OPERATOR_NEW,
2034	OPERATOR_DELETE,
2035	LAMBDA_FUNCTION
2036
2037	/* 0 values left */
2038	};
2039
2040	/* FUNCTION_DECL inherits from DECL_NON_COMMON because of the use of the
2041	arguments/result/saved_tree fields by front ends. It was either inherit
2042	FUNCTION_DECL from non_common, or inherit non_common from FUNCTION_DECL,
2043	which seemed a bit strange. */
2044
2045	struct GTY(()) tree_function_decl {
2046	struct tree_decl_non_common common;
2047
2048	struct function *f;
2049
2050	/* Arguments of the function. */
2051	tree arguments;
2052	/* The personality function. Used for stack unwinding. */
2053	tree personality;
2054
2055	/* Function specific options that are used by this function. */
2056	tree function_specific_target; /* target options */
2057	tree function_specific_optimization; /* optimization options */
2058
2059	/* Generic function body. */
2060	tree saved_tree;
2061	/* Index within a virtual table. */
2062	tree vindex;
2063
2064	/* In a FUNCTION_DECL this is DECL_UNCHECKED_FUNCTION_CODE. */
2065	unsigned int function_code;
2066
2067	ENUM_BITFIELD(built_in_class) built_in_class : 2;
2068	unsigned static_ctor_flag : 1;
2069	unsigned static_dtor_flag : 1;
2070	unsigned uninlinable : 1;
2071	unsigned possibly_inlined : 1;
2072	unsigned novops_flag : 1;
2073	unsigned returns_twice_flag : 1;
2074
2075	unsigned malloc_flag : 1;
2076	unsigned declared_inline_flag : 1;
2077	unsigned no_inline_warning_flag : 1;
2078	unsigned no_instrument_function_entry_exit : 1;
2079	unsigned no_limit_stack : 1;
2080	unsigned disregard_inline_limits : 1;
2081	unsigned pure_flag : 1;
2082	unsigned looping_const_or_pure_flag : 1;
2083
2084	/* Align the bitfield to boundary of a byte. */
2085	ENUM_BITFIELD(function_decl_type) decl_type: 2;
2086	unsigned has_debug_args_flag : 1;
2087	unsigned versioned_function : 1;
2088	unsigned replaceable_operator : 1;
2089
2090	/* 11 bits left for future expansion. */
2091	/* 32 bits on 64-bit HW. */
2092	};
2093
2094	struct GTY(()) tree_translation_unit_decl {
2095	struct tree_decl_common common;
2096	/* Source language of this translation unit. Used for DWARF output. */
2097	const char *language;
2098	/* TODO: Non-optimization used to build this translation unit. */
2099	/* TODO: Root of a partial DWARF tree for global types and decls. */
2100	};
2101
2102	struct GTY(()) tree_type_decl {
2103	struct tree_decl_non_common common;
2104
2105	};
2106
2107	struct GTY ((chain_next ("%h.next"), chain_prev ("%h.prev"))) tree_statement_list_node
2108	{
2109	struct tree_statement_list_node *prev;
2110	struct tree_statement_list_node *next;
2111	tree stmt;
2112	};
2113
2114	struct GTY(()) tree_statement_list
2115	{
2116	struct tree_typed typed;
2117	struct tree_statement_list_node *head;
2118	struct tree_statement_list_node *tail;
2119	};
2120
2121
2122	/* Optimization options used by a function. */
2123
2124	struct GTY(()) tree_optimization_option {
2125	struct tree_base base;
2126
2127	/* The optimization options used by the user. */
2128	struct cl_optimization *opts;
2129
2130	/* Target optabs for this set of optimization options. This is of
2131	type `struct target_optabs *'. */
2132	void *GTY ((atomic)) optabs;
2133
2134	/* The value of this_target_optabs against which the optabs above were
2135	generated. */
2136	struct target_optabs *GTY ((skip)) base_optabs;
2137	};
2138
2139	/* Forward declaration, defined in target-globals.h. */
2140
2141	class GTY(()) target_globals;
2142
2143	/* Target options used by a function. */
2144
2145	struct GTY(()) tree_target_option {
2146	struct tree_base base;
2147
2148	/* Target globals for the corresponding target option. */
2149	class target_globals *globals;
2150
2151	/* The optimization options used by the user. */
2152	struct cl_target_option *opts;
2153	};
2154
2155	/* Define the overall contents of a tree node.
2156	It may be any of the structures declared above
2157	for various types of node. */
2158	union GTY ((ptr_alias (union lang_tree_node),
2159	desc ("tree_node_structure (&%h)"), variable_size)) tree_node {
2160	struct tree_base GTY ((tag ("TS_BASE"))) base;
2161	struct tree_typed GTY ((tag ("TS_TYPED"))) typed;
2162	struct tree_common GTY ((tag ("TS_COMMON"))) common;
2163	struct tree_int_cst GTY ((tag ("TS_INT_CST"))) int_cst;
2164	struct tree_poly_int_cst GTY ((tag ("TS_POLY_INT_CST"))) poly_int_cst;
2165	struct tree_real_cst GTY ((tag ("TS_REAL_CST"))) real_cst;
2166	struct tree_fixed_cst GTY ((tag ("TS_FIXED_CST"))) fixed_cst;
2167	struct tree_vector GTY ((tag ("TS_VECTOR"))) vector;
2168	struct tree_string GTY ((tag ("TS_STRING"))) string;
2169	struct tree_raw_data GTY ((tag ("TS_RAW_DATA_CST"))) raw_data_cst;
2170	struct tree_complex GTY ((tag ("TS_COMPLEX"))) complex;
2171	struct tree_identifier GTY ((tag ("TS_IDENTIFIER"))) identifier;
2172	struct tree_decl_minimal GTY((tag ("TS_DECL_MINIMAL"))) decl_minimal;
2173	struct tree_decl_common GTY ((tag ("TS_DECL_COMMON"))) decl_common;
2174	struct tree_decl_with_rtl GTY ((tag ("TS_DECL_WRTL"))) decl_with_rtl;
2175	struct tree_decl_non_common GTY ((tag ("TS_DECL_NON_COMMON")))
2176	decl_non_common;
2177	struct tree_parm_decl GTY ((tag ("TS_PARM_DECL"))) parm_decl;
2178	struct tree_decl_with_vis GTY ((tag ("TS_DECL_WITH_VIS"))) decl_with_vis;
2179	struct tree_var_decl GTY ((tag ("TS_VAR_DECL"))) var_decl;
2180	struct tree_field_decl GTY ((tag ("TS_FIELD_DECL"))) field_decl;
2181	struct tree_label_decl GTY ((tag ("TS_LABEL_DECL"))) label_decl;
2182	struct tree_result_decl GTY ((tag ("TS_RESULT_DECL"))) result_decl;
2183	struct tree_const_decl GTY ((tag ("TS_CONST_DECL"))) const_decl;
2184	struct tree_type_decl GTY ((tag ("TS_TYPE_DECL"))) type_decl;
2185	struct tree_function_decl GTY ((tag ("TS_FUNCTION_DECL"))) function_decl;
2186	struct tree_translation_unit_decl GTY ((tag ("TS_TRANSLATION_UNIT_DECL")))
2187	translation_unit_decl;
2188	struct tree_type_common GTY ((tag ("TS_TYPE_COMMON"))) type_common;
2189	struct tree_type_with_lang_specific GTY ((tag ("TS_TYPE_WITH_LANG_SPECIFIC")))
2190	type_with_lang_specific;
2191	struct tree_type_non_common GTY ((tag ("TS_TYPE_NON_COMMON")))
2192	type_non_common;
2193	struct tree_list GTY ((tag ("TS_LIST"))) list;
2194	struct tree_vec GTY ((tag ("TS_VEC"))) vec;
2195	struct tree_exp GTY ((tag ("TS_EXP"))) exp;
2196	struct tree_ssa_name GTY ((tag ("TS_SSA_NAME"))) ssa_name;
2197	struct tree_block GTY ((tag ("TS_BLOCK"))) block;
2198	struct tree_binfo GTY ((tag ("TS_BINFO"))) binfo;
2199	struct tree_statement_list GTY ((tag ("TS_STATEMENT_LIST"))) stmt_list;
2200	struct tree_constructor GTY ((tag ("TS_CONSTRUCTOR"))) constructor;
2201	struct tree_omp_clause GTY ((tag ("TS_OMP_CLAUSE"))) omp_clause;
2202	struct tree_optimization_option GTY ((tag ("TS_OPTIMIZATION"))) optimization;
2203	struct tree_target_option GTY ((tag ("TS_TARGET_OPTION"))) target_option;
2204	};
2205
2206	/* Structure describing an attribute and a function to handle it. */
2207	struct attribute_spec {
2208	/* The name of the attribute (without any leading or trailing __),
2209	or NULL to mark the end of a table of attributes. */
2210	const char *name;
2211	/* The minimum length of the list of arguments of the attribute. */
2212	int min_length;
2213	/* The maximum length of the list of arguments of the attribute
2214	(-1 for no maximum). It can also be -2 for fake attributes
2215	created for the sake of -Wno-attributes; in that case, we
2216	should skip the balanced token sequence when parsing the attribute. */
2217	int max_length;
2218	/* Whether this attribute requires a DECL. If it does, it will be passed
2219	from types of DECLs, function return types and array element types to
2220	the DECLs, function types and array types respectively; but when
2221	applied to a type in any other circumstances, it will be ignored with
2222	a warning. (If greater control is desired for a given attribute,
2223	this should be false, and the flags argument to the handler may be
2224	used to gain greater control in that case.) */
2225	bool decl_required;
2226	/* Whether this attribute requires a type. If it does, it will be passed
2227	from a DECL to the type of that DECL. */
2228	bool type_required;
2229	/* Whether this attribute requires a function (or method) type. If it does,
2230	it will be passed from a function pointer type to the target type,
2231	and from a function return type (which is not itself a function
2232	pointer type) to the function type. */
2233	bool function_type_required;
2234	/* Specifies if attribute affects type's identity. */
2235	bool affects_type_identity;
2236	/* Function to handle this attribute. NODE points to a tree[3] array,
2237	where node[0] is the node to which the attribute is to be applied;
2238	node[1] is the last pushed/merged declaration if one exists, and node[2]
2239	may be the declaration for node[0]. If a DECL, it should be modified in
2240	place; if a TYPE, a copy should be created. NAME is the canonicalized
2241	name of the attribute i.e. without any leading or trailing underscores.
2242	ARGS is the TREE_LIST of the arguments (which may be NULL). FLAGS gives
2243	further information about the context of the attribute. Afterwards, the
2244	attributes will be added to the DECL_ATTRIBUTES or TYPE_ATTRIBUTES, as
2245	appropriate, unless *NO_ADD_ATTRS is set to true (which should be done on
2246	error, as well as in any other cases when the attributes should not be
2247	added to the DECL or TYPE). Depending on FLAGS, any attributes to be
2248	applied to another type or DECL later may be returned;
2249	otherwise the return value should be NULL_TREE. This pointer may be
2250	NULL if no special handling is required beyond the checks implied
2251	by the rest of this structure. */
2252	tree (*handler) (tree *node, tree name, tree args,
2253	int flags, bool *no_add_attrs);
2254
2255	/* Specifies the name of an attribute that's mutually exclusive with
2256	this one, and whether the relationship applies to the function,
2257	variable, or type form of the attribute. */
2258	struct exclusions {
2259	const char *name;
2260	bool function;
2261	bool variable;
2262	bool type;
2263	};
2264
2265	/* An array of attribute exclusions describing names of other attributes
2266	that this attribute is mutually exclusive with. */
2267	const exclusions *exclude;
2268	};
2269
2270	/* These functions allow a front-end to perform a manual layout of a
2271	RECORD_TYPE. (For instance, if the placement of subsequent fields
2272	depends on the placement of fields so far.) Begin by calling
2273	start_record_layout. Then, call place_field for each of the
2274	fields. Then, call finish_record_layout. See layout_type for the
2275	default way in which these functions are used. */
2276	typedef struct record_layout_info_s {
2277	/* The RECORD_TYPE that we are laying out. */
2278	tree t;
2279	/* The offset into the record so far, in bytes, not including bits in
2280	BITPOS. */
2281	tree offset;
2282	/* The last known alignment of SIZE. */
2283	unsigned int offset_align;
2284	/* The bit position within the last OFFSET_ALIGN bits, in bits. */
2285	tree bitpos;
2286	/* The alignment of the record so far, in bits. */
2287	unsigned int record_align;
2288	/* The alignment of the record so far, ignoring #pragma pack and
2289	__attribute__ ((packed)), in bits. */
2290	unsigned int unpacked_align;
2291	/* The previous field laid out. */
2292	tree prev_field;
2293	/* The static variables (i.e., class variables, as opposed to
2294	instance variables) encountered in T. */
2295	vec<tree, va_gc> *pending_statics;
2296	/* Bits remaining in the current alignment group */
2297	int remaining_in_alignment;
2298	/* True if we've seen a packed field that didn't have normal
2299	alignment anyway. */
2300	int packed_maybe_necessary;
2301	} *record_layout_info;
2302
2303	/* Iterator for going through the function arguments. */
2304	struct function_args_iterator {
2305	tree next; /* TREE_LIST pointing to the next argument */
2306	};
2307
2308	/* Structures to map from a tree to another tree. */
2309	struct GTY(()) tree_map_base {
2310	tree from;
2311	};
2312
2313	/* Map from a tree to another tree. */
2314
2315	struct GTY((for_user)) tree_map {
2316	struct tree_map_base base;
2317	unsigned int hash;
2318	tree to;
2319	};
2320
2321	/* Map from a decl tree to another tree. */
2322	struct GTY((for_user)) tree_decl_map {
2323	struct tree_map_base base;
2324	tree to;
2325	};
2326
2327	/* Map from a tree to an int. */
2328	struct GTY((for_user)) tree_int_map {
2329	struct tree_map_base base;
2330	unsigned int to;
2331	};
2332
2333	/* Map from a decl tree to a tree vector. */
2334	struct GTY((for_user)) tree_vec_map {
2335	struct tree_map_base base;
2336	vec<tree, va_gc> *to;
2337	};
2338
2339	/* Abstract iterators for CALL_EXPRs. These static inline definitions
2340	have to go towards the end of tree.h so that union tree_node is fully
2341	defined by this point. */
2342
2343	/* Structure containing iterator state. */
2344	struct call_expr_arg_iterator {
2345	tree t; /* the call_expr */
2346	int n; /* argument count */
2347	int i; /* next argument index */
2348	};
2349
2350	struct const_call_expr_arg_iterator {
2351	const_tree t; /* the call_expr */
2352	int n; /* argument count */
2353	int i; /* next argument index */
2354	};
2355
2356	/* The builtin_info structure holds the FUNCTION_DECL of the standard builtin
2357	function, and flags. */
2358	struct GTY(()) builtin_info_type {
2359	tree decl;
2360	/* Whether the user can use <xxx> instead of explicitly using calls
2361	to __builtin_<xxx>. */
2362	unsigned implicit_p : 1;
2363	/* Whether the user has provided a declaration of <xxx>. */
2364	unsigned declared_p : 1;
2365	};
2366
2367	/* Information about a _FloatN or _FloatNx type that may be
2368	supported. */
2369	struct floatn_type_info {
2370	/* The number N in the type name. */
2371	int n;
2372	/* Whether it is an extended type _FloatNx (true) or an interchange
2373	type (false). */
2374	bool extended;
2375	};
2376
2377
2378	/*---------------------------------------------------------------------------
2379	Global variables
2380	---------------------------------------------------------------------------*/
2381	/* Matrix describing the structures contained in a given tree code. */
2382	extern bool tree_contains_struct[MAX_TREE_CODES][64];
2383
2384	/* Class of tree given its code. */
2385	#define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
2386	#define END_OF_BASE_TREE_CODES tcc_exceptional,
2387
2388	#if __cpp_inline_variables < 201606L
2389	template <int N>
2390	struct tree_code_type_tmpl {
2391	static constexpr enum tree_code_class tree_code_type[] = {
2392	#include "all-tree.def"
2393	};
2394	};
2395
2396	template <int N>
2397	constexpr enum tree_code_class tree_code_type_tmpl<N>::tree_code_type[];
2398	#else
2399	constexpr inline enum tree_code_class tree_code_type[] = {
2400	#include "all-tree.def"
2401	};
2402	#endif
2403
2404	#undef DEFTREECODE
2405	#undef END_OF_BASE_TREE_CODES
2406
2407	/* Each tree code class has an associated string representation.
2408	These must correspond to the tree_code_class entries. */
2409	extern const char *const tree_code_class_strings[];
2410
2411	/* Number of argument-words in each kind of tree-node. */
2412
2413	#define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
2414	#define END_OF_BASE_TREE_CODES 0,
2415
2416	#if __cpp_inline_variables < 201606L
2417	template <int N>
2418	struct tree_code_length_tmpl {
2419	static constexpr unsigned char tree_code_length[] = {
2420	#include "all-tree.def"
2421	};
2422	};
2423
2424	template <int N>
2425	constexpr unsigned char tree_code_length_tmpl<N>::tree_code_length[];
2426	#else
2427	constexpr inline unsigned char tree_code_length[] = {
2428	#include "all-tree.def"
2429	};
2430	#endif
2431
2432	#undef DEFTREECODE
2433	#undef END_OF_BASE_TREE_CODES
2434
2435	/* Vector of all alias pairs for global symbols. */
2436	extern GTY(()) vec<alias_pair, va_gc> *alias_pairs;
2437
2438	/* Names of all the built_in classes. */
2439	extern const char *const built_in_class_names[BUILT_IN_LAST];
2440
2441	/* Names of all the built_in functions. */
2442	extern const char * built_in_names[(int) END_BUILTINS];
2443
2444	/* Number of operands and names for each OMP_CLAUSE node. */
2445	extern unsigned const char omp_clause_num_ops[];
2446	extern const char * const omp_clause_code_name[];
2447	extern const char *user_omp_clause_code_name (tree, bool);
2448
2449	/* A vector of all translation-units. */
2450	extern GTY (()) vec<tree, va_gc> *all_translation_units;
2451
2452	/* Vector of standard trees used by the C compiler. */
2453	extern GTY(()) tree global_trees[TI_MAX];
2454
2455	/* The standard C integer types. Use integer_type_kind to index into
2456	this array. */
2457	extern GTY(()) tree integer_types[itk_none];
2458
2459	/* Types used to represent sizes. */
2460	extern GTY(()) tree sizetype_tab[(int) stk_type_kind_last];
2461
2462	/* Arrays for keeping track of tree node statistics. */
2463	extern uint64_t tree_node_counts[];
2464	extern uint64_t tree_node_sizes[];
2465
2466	/* True if we are in gimple form and the actions of the folders need to
2467	be restricted. False if we are not in gimple form and folding is not
2468	restricted to creating gimple expressions. */
2469	extern bool in_gimple_form;
2470
2471	/* Functional interface to the builtin functions. */
2472	extern GTY(()) builtin_info_type builtin_info[(int)END_BUILTINS];
2473
2474	/* If nonzero, an upper limit on alignment of structure fields, in bits, */
2475	extern unsigned int maximum_field_alignment;
2476
2477	/* Points to the FUNCTION_DECL of the function whose body we are reading. */
2478	extern GTY(()) tree current_function_decl;
2479
2480	/* Nonzero means a FUNC_BEGIN label was emitted. */
2481	extern GTY(()) const char * current_function_func_begin_label;
2482
2483	/* Information about the _FloatN and _FloatNx types. */
2484	extern const floatn_type_info floatn_nx_types[NUM_FLOATN_NX_TYPES];
2485
2486	#endif // GCC_TREE_CORE_H
2487