1/* This file contains the definitions and documentation for the
2 additional tree codes used in the GNU C++ compiler (see tree.def
3 for the standard codes).
4 Copyright (C) 1987-2023 Free Software Foundation, Inc.
5 Hacked by Michael Tiemann (tiemann@cygnus.com)
6
7This file is part of GCC.
8
9GCC is free software; you can redistribute it and/or modify
10it under the terms of the GNU General Public License as published by
11the Free Software Foundation; either version 3, or (at your option)
12any later version.
13
14GCC is distributed in the hope that it will be useful,
15but WITHOUT ANY WARRANTY; without even the implied warranty of
16MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17GNU General Public License for more details.
18
19You should have received a copy of the GNU General Public License
20along with GCC; see the file COPYING3. If not see
21<http://www.gnu.org/licenses/>. */
22
23
24/* An OFFSET_REF is used in two situations:
25
26 1. An expression of the form `A::m' where `A' is a class and `m' is
27 a non-static member or an overload set. In this case, operand 0
28 will be a TYPE (corresponding to `A') and operand 1 will be a
29 FIELD_DECL, BASELINK, or TEMPLATE_ID_EXPR (corresponding to `m').
30
31 The expression is a pointer-to-member if its address is taken (and
32 if, after any overload resolution, 'm' does not designate a
33 static or explicit object member function). It simply denotes a
34 member of the object if its address is not taken.
35
36 This form is only used during the parsing phase; once semantic
37 analysis has taken place they are eliminated.
38
39 2. An expression of the form `x.*p'. In this case, operand 0 will
40 be an expression corresponding to `x' and operand 1 will be an
41 expression with pointer-to-member type. */
42DEFTREECODE (OFFSET_REF, "offset_ref", tcc_reference, 2)
43
44/* A pointer-to-member constant. For a pointer-to-member constant
45 `X::Y' The PTRMEM_CST_CLASS is the RECORD_TYPE for `X' and the
46 PTRMEM_CST_MEMBER is the _DECL for `Y'. */
47DEFTREECODE (PTRMEM_CST, "ptrmem_cst", tcc_constant, 0)
48
49/* For NEW_EXPR, operand 0 is the placement list.
50 Operand 1 is the new-declarator.
51 Operand 2 is the number of elements in the array.
52 Operand 3 is the initializer. */
53DEFTREECODE (NEW_EXPR, "nw_expr", tcc_expression, 4)
54DEFTREECODE (VEC_NEW_EXPR, "vec_nw_expr", tcc_expression, 3)
55
56/* For DELETE_EXPR, operand 0 is the store to be destroyed.
57 Operand 1 is the value to pass to the destroying function
58 saying whether the store should be deallocated as well. */
59DEFTREECODE (DELETE_EXPR, "dl_expr", tcc_expression, 2)
60DEFTREECODE (VEC_DELETE_EXPR, "vec_dl_expr", tcc_expression, 2)
61
62/* Value is reference to particular overloaded class method.
63 Operand 0 is the class, operand 1 is the field
64 The COMPLEXITY field holds the class level (usually 0). */
65DEFTREECODE (SCOPE_REF, "scope_ref", tcc_reference, 2)
66
67/* When composing an object with a member, this is the result.
68 Operand 0 is the object. Operand 1 is the member (usually
69 a dereferenced pointer to member). */
70DEFTREECODE (MEMBER_REF, "member_ref", tcc_reference, 2)
71
72/* Type conversion operator in C++. TREE_TYPE is type that this
73 operator converts to. Operand is expression to be converted. */
74DEFTREECODE (TYPE_EXPR, "type_expr", tcc_expression, 1)
75
76/* AGGR_INIT_EXPRs have a variably-sized representation similar to
77 that of CALL_EXPRs. Operand 0 is an INTEGER_CST node containing the
78 operand count, operand 1 is the function which performs initialization,
79 operand 2 is the slot which was allocated for this expression, and
80 the remaining operands are the arguments to the initialization function. */
81DEFTREECODE (AGGR_INIT_EXPR, "aggr_init_expr", tcc_vl_exp, 3)
82
83/* Initialization of an array from another array, expressed at a high level
84 so that it works with TARGET_EXPR. Operand 0 is the target, operand 1
85 is the initializer. */
86DEFTREECODE (VEC_INIT_EXPR, "vec_init_expr", tcc_expression, 2)
87
88/* A throw expression. operand 0 is the expression, if there was one,
89 else it is NULL_TREE. */
90DEFTREECODE (THROW_EXPR, "throw_expr", tcc_expression, 1)
91
92/* An empty class object. The TREE_TYPE gives the class type. We use
93 these to avoid actually creating instances of the empty classes. */
94DEFTREECODE (EMPTY_CLASS_EXPR, "empty_class_expr", tcc_expression, 0)
95
96/* A reference to a member function or member functions from a base
97 class. BASELINK_FUNCTIONS gives the FUNCTION_DECL,
98 TEMPLATE_DECL, OVERLOAD, or TEMPLATE_ID_EXPR corresponding to the
99 functions. BASELINK_BINFO gives the base from which the functions
100 come, i.e., the base to which the `this' pointer must be converted
101 before the functions are called. BASELINK_ACCESS_BINFO gives the
102 base used to name the functions.
103
104 A BASELINK is an expression; the TREE_TYPE of the BASELINK gives
105 the type of the expression. This type is either a FUNCTION_TYPE,
106 METHOD_TYPE, or `unknown_type_node' indicating that the function is
107 overloaded. */
108DEFTREECODE (BASELINK, "baselink", tcc_exceptional, 0)
109
110/* Template definition. The following fields have the specified uses,
111 although there are other macros in cp-tree.h that should be used for
112 accessing this data.
113 DECL_ARGUMENTS template parm vector
114 DECL_TEMPLATE_INFO template text &c
115 DECL_VINDEX list of instantiations already produced;
116 only done for functions so far
117 For class template:
118 DECL_INITIAL associated templates (methods &c)
119 DECL_TEMPLATE_RESULT null
120 For non-class templates:
121 TREE_TYPE type of object to be constructed
122 DECL_TEMPLATE_RESULT decl for object to be created
123 (e.g., FUNCTION_DECL with tmpl parms used)
124 */
125DEFTREECODE (TEMPLATE_DECL, "template_decl", tcc_declaration, 0)
126
127/* Index into a template parameter list. The TEMPLATE_PARM_IDX gives
128 the index (from 0) of the parameter, while the TEMPLATE_PARM_LEVEL
129 gives the level (from 1) of the parameter.
130
131 Here's an example:
132
133 template <class T> // Index 0, Level 1.
134 struct S
135 {
136 template <class U, // Index 0, Level 2.
137 class V> // Index 1, Level 2.
138 void f();
139 };
140
141 The DESCENDANTS will be a chain of TEMPLATE_PARM_INDEXs descended
142 from this one. The first descendant will have the same IDX, but
143 its LEVEL will be one less. The TREE_CHAIN field is used to chain
144 together the descendants. The TEMPLATE_PARM_DECL is the
145 declaration of this parameter, either a TYPE_DECL or CONST_DECL.
146 The TEMPLATE_PARM_ORIG_LEVEL is the LEVEL of the most distant
147 parent, i.e., the LEVEL that the parameter originally had when it
148 was declared. For example, if we instantiate S<int>, we will have:
149
150 struct S<int>
151 {
152 template <class U, // Index 0, Level 1, Orig Level 2
153 class V> // Index 1, Level 1, Orig Level 2
154 void f();
155 };
156
157 The LEVEL is the level of the parameter when we are worrying about
158 the types of things; the ORIG_LEVEL is the level when we are
159 worrying about instantiating things. */
160DEFTREECODE (TEMPLATE_PARM_INDEX, "template_parm_index", tcc_exceptional, 0)
161
162/* Index into a template parameter list for template template parameters.
163 This parameter must be a type. The TYPE_FIELDS value will be a
164 TEMPLATE_PARM_INDEX.
165
166 It is used without template arguments like TT in C<TT>,
167 TYPE_NAME is a TEMPLATE_DECL. */
168DEFTREECODE (TEMPLATE_TEMPLATE_PARM, "template_template_parm", tcc_type, 0)
169
170/* The ordering of the following codes is optimized for the checking
171 macros in tree.h. Changing the order will degrade the speed of the
172 compiler. TEMPLATE_TYPE_PARM, TYPENAME_TYPE, TYPEOF_TYPE,
173 BOUND_TEMPLATE_TEMPLATE_PARM. */
174
175/* Index into a template parameter list. This parameter must be a type.
176 The type.values field will be a TEMPLATE_PARM_INDEX. */
177DEFTREECODE (TEMPLATE_TYPE_PARM, "template_type_parm", tcc_type, 0)
178
179/* A type designated by `typename T::t'. TYPE_CONTEXT is `T',
180 TYPE_NAME is an IDENTIFIER_NODE for `t'. If the type was named via
181 template-id, TYPENAME_TYPE_FULLNAME will hold the TEMPLATE_ID_EXPR.
182 TREE_TYPE is always NULL. */
183DEFTREECODE (TYPENAME_TYPE, "typename_type", tcc_type, 0)
184
185/* A type designated by `__typeof (expr)'. TYPEOF_TYPE_EXPR is the
186 expression in question. */
187DEFTREECODE (TYPEOF_TYPE, "typeof_type", tcc_type, 0)
188
189/* Like TEMPLATE_TEMPLATE_PARM it is used with bound template arguments
190 like TT<int>.
191 In this case, TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO contains the
192 template name and its bound arguments. TYPE_NAME is a TYPE_DECL. */
193DEFTREECODE (BOUND_TEMPLATE_TEMPLATE_PARM, "bound_template_template_parm",
194 tcc_type, 0)
195
196/* For template template argument of the form `T::template C'.
197 TYPE_CONTEXT is `T', the template parameter dependent object.
198 TYPE_NAME is a TEMPLATE_DECL, whose DECL_TEMPLATE_PARMS are any
199 template parms of the instantiation. That decl's DECL_NAME is the
200 IDENTIFIER_NODE for `C', the member class template. */
201DEFTREECODE (UNBOUND_CLASS_TEMPLATE, "unbound_class_template", tcc_type, 0)
202
203/* A using declaration. USING_DECL_SCOPE contains the specified
204 scope. In a variadic using-declaration, this is a TYPE_PACK_EXPANSION.
205 In a member using decl, unless DECL_DEPENDENT_P is true,
206 USING_DECL_DECLS contains the _DECL or OVERLOAD so named. This is
207 not an alias, but is later expanded into multiple aliases. */
208DEFTREECODE (USING_DECL, "using_decl", tcc_declaration, 0)
209
210/* A using directive. The operand is USING_STMT_NAMESPACE. */
211DEFTREECODE (USING_STMT, "using_stmt", tcc_statement, 1)
212
213/* An un-parsed operand. Holds a vector of input tokens and
214 a vector of places where the argument was instantiated before
215 parsing had occurred. This is used for default arguments, delayed
216 NSDMIs, and noexcept-specifier parsing. */
217DEFTREECODE (DEFERRED_PARSE, "deferred_parse", tcc_exceptional, 0)
218
219/* An uninstantiated/unevaluated noexcept-specification. For the
220 uninstantiated case, DEFERRED_NOEXCEPT_PATTERN is the pattern from the
221 template, and DEFERRED_NOEXCEPT_ARGS are the template arguments to
222 substitute into the pattern when needed. For the unevaluated case,
223 those slots are NULL_TREE and we use get_defaulted_eh_spec to find
224 the exception-specification. */
225DEFTREECODE (DEFERRED_NOEXCEPT, "deferred_noexcept", tcc_exceptional, 0)
226
227/* A template-id, like foo<int>. The first operand is the template.
228 The second is NULL if there are no explicit arguments, or a
229 TREE_VEC of arguments. The template will be a FUNCTION_DECL,
230 TEMPLATE_DECL, or an OVERLOAD. If the template-id refers to a
231 member template, the template may be an IDENTIFIER_NODE. */
232DEFTREECODE (TEMPLATE_ID_EXPR, "template_id_expr", tcc_expression, 2)
233
234/* One of a set of overloaded functions. */
235DEFTREECODE (OVERLOAD, "overload", tcc_exceptional, 0)
236
237/* A vector of binding slots. */
238DEFTREECODE (BINDING_VECTOR, "binding_vector", tcc_exceptional, 0)
239
240/* A pseudo-destructor, of the form "OBJECT.~DESTRUCTOR" or
241 "OBJECT.SCOPE::~DESTRUCTOR. The first operand is the OBJECT. The
242 second operand (if non-NULL) is the SCOPE. The third operand is
243 the TYPE node corresponding to the DESTRUCTOR. The type of the
244 first operand will always be a scalar type.
245
246 The type of a PSEUDO_DTOR_EXPR is always "void", even though it can
247 be used as if it were a zero-argument function. We handle the
248 function-call case specially, and giving it "void" type prevents it
249 being used in expressions in ways that are not permitted. */
250DEFTREECODE (PSEUDO_DTOR_EXPR, "pseudo_dtor_expr", tcc_expression, 3)
251
252/* A whole bunch of tree codes for the initial, superficial parsing of
253 templates. */
254DEFTREECODE (MODOP_EXPR, "modop_expr", tcc_expression, 3)
255DEFTREECODE (CAST_EXPR, "cast_expr", tcc_unary, 1)
256DEFTREECODE (REINTERPRET_CAST_EXPR, "reinterpret_cast_expr", tcc_unary, 1)
257DEFTREECODE (CONST_CAST_EXPR, "const_cast_expr", tcc_unary, 1)
258DEFTREECODE (STATIC_CAST_EXPR, "static_cast_expr", tcc_unary, 1)
259DEFTREECODE (DYNAMIC_CAST_EXPR, "dynamic_cast_expr", tcc_unary, 1)
260DEFTREECODE (IMPLICIT_CONV_EXPR, "implicit_conv_expr", tcc_unary, 1)
261DEFTREECODE (DOTSTAR_EXPR, "dotstar_expr", tcc_expression, 2)
262DEFTREECODE (TYPEID_EXPR, "typeid_expr", tcc_expression, 1)
263DEFTREECODE (NOEXCEPT_EXPR, "noexcept_expr", tcc_unary, 1)
264DEFTREECODE (SPACESHIP_EXPR, "spaceship_expr", tcc_expression, 2)
265
266/* CTOR_INITIALIZER is a placeholder in template code for a call to
267 setup_vtbl_pointer (and appears in all functions, not just ctors). */
268DEFTREECODE (CTOR_INITIALIZER, "ctor_initializer", tcc_expression, 1)
269
270DEFTREECODE (TRY_BLOCK, "try_block", tcc_statement, 2)
271
272DEFTREECODE (EH_SPEC_BLOCK, "eh_spec_block", tcc_statement, 2)
273
274/* A HANDLER wraps a catch handler for the HANDLER_TYPE. If this is
275 CATCH_ALL_TYPE, then the handler catches all types. The declaration of
276 the catch variable is in HANDLER_PARMS, and the body block in
277 HANDLER_BODY. */
278DEFTREECODE (HANDLER, "handler", tcc_statement, 2)
279
280/* A MUST_NOT_THROW_EXPR wraps an expression that may not
281 throw, and must call terminate if it does. The second argument
282 is a condition, used in templates to express noexcept (condition). */
283DEFTREECODE (MUST_NOT_THROW_EXPR, "must_not_throw_expr", tcc_expression, 2)
284
285/* A CLEANUP_STMT marks the point at which a declaration is fully
286 constructed. The CLEANUP_EXPR is run on behalf of CLEANUP_DECL
287 when CLEANUP_BODY completes. */
288DEFTREECODE (CLEANUP_STMT, "cleanup_stmt", tcc_statement, 3)
289
290/* Represents an 'if' statement. The operands are IF_COND,
291 THEN_CLAUSE, and ELSE_CLAUSE, and the current scope, respectively. */
292/* ??? It is currently still necessary to distinguish between IF_STMT
293 and COND_EXPR for the benefit of templates. */
294DEFTREECODE (IF_STMT, "if_stmt", tcc_statement, 4)
295
296/* Used to represent a range-based `for' statement. The operands are
297 RANGE_FOR_DECL, RANGE_FOR_EXPR, RANGE_FOR_BODY, RANGE_FOR_SCOPE,
298 RANGE_FOR_UNROLL, and RANGE_FOR_INIT_STMT, respectively. Only used in
299 templates. */
300DEFTREECODE (RANGE_FOR_STMT, "range_for_stmt", tcc_statement, 6)
301
302/* Used to represent an expression statement. Use `EXPR_STMT_EXPR' to
303 obtain the expression. */
304DEFTREECODE (EXPR_STMT, "expr_stmt", tcc_expression, 1)
305
306DEFTREECODE (TAG_DEFN, "tag_defn", tcc_expression, 0)
307
308/* Represents an 'offsetof' expression during template expansion. */
309DEFTREECODE (OFFSETOF_EXPR, "offsetof_expr", tcc_expression, 2)
310
311/* Represents an '__builtin_addressof' expression during template
312 expansion. This is similar to ADDR_EXPR, but it doesn't invoke
313 overloaded & operators. */
314DEFTREECODE (ADDRESSOF_EXPR, "addressof_expr", tcc_expression, 1)
315
316/* Represents the -> operator during template expansion. */
317DEFTREECODE (ARROW_EXPR, "arrow_expr", tcc_expression, 1)
318
319/* Represents an '__alignof__' expression during template
320 expansion. */
321DEFTREECODE (ALIGNOF_EXPR, "alignof_expr", tcc_expression, 1)
322
323/* Represents an Objective-C++ '@encode' expression during template
324 expansion. */
325DEFTREECODE (AT_ENCODE_EXPR, "at_encode_expr", tcc_expression, 1)
326
327/* A STMT_EXPR represents a statement-expression during template
328 expansion. This is the GCC extension { ( ... ) }. The
329 STMT_EXPR_STMT is the statement given by the expression. */
330DEFTREECODE (STMT_EXPR, "stmt_expr", tcc_expression, 1)
331
332/* Unary plus. Operand 0 is the expression to which the unary plus
333 is applied. */
334DEFTREECODE (UNARY_PLUS_EXPR, "unary_plus_expr", tcc_unary, 1)
335
336/** C++11 extensions. */
337
338/* A static assertion. This is a C++11 extension.
339 STATIC_ASSERT_CONDITION contains the condition that is being
340 checked. STATIC_ASSERT_MESSAGE contains the message (a string
341 literal) to be displayed if the condition fails to hold. */
342DEFTREECODE (STATIC_ASSERT, "static_assert", tcc_exceptional, 0)
343
344/* Represents an argument pack of types (or templates). An argument
345 pack stores zero or more arguments that will be used to instantiate
346 a parameter pack.
347
348 ARGUMENT_PACK_ARGS retrieves the arguments stored in the argument
349 pack.
350
351 Example:
352 template<typename... Values>
353 class tuple { ... };
354
355 tuple<int, float, double> t;
356
357 Values is a (template) parameter pack. When tuple<int, float,
358 double> is instantiated, the Values parameter pack is instantiated
359 with the argument pack <int, float, double>. ARGUMENT_PACK_ARGS will
360 be a TREE_VEC containing int, float, and double. */
361DEFTREECODE (TYPE_ARGUMENT_PACK, "type_argument_pack", tcc_type, 0)
362
363/* Represents an argument pack of values, which can be used either for
364 non-type template arguments or function call arguments.
365
366 NONTYPE_ARGUMENT_PACK plays precisely the same role as
367 TYPE_ARGUMENT_PACK, but will be used for packing non-type template
368 arguments (e.g., "int... Dimensions") or function arguments ("const
369 Args&... args"). */
370DEFTREECODE (NONTYPE_ARGUMENT_PACK, "nontype_argument_pack", tcc_expression, 1)
371
372/* Represents a type expression that will be expanded into a list of
373 types when instantiated with one or more argument packs.
374
375 PACK_EXPANSION_PATTERN retrieves the expansion pattern. This is
376 the type or expression that we will substitute into with each
377 argument in an argument pack.
378
379 PACK_EXPANSION_PARAMETER_PACKS contains a TREE_LIST of the parameter
380 packs that are used in this pack expansion.
381
382 Example:
383 template<typename... Values>
384 struct tied : tuple<Values&...> {
385 // ...
386 };
387
388 The derivation from tuple contains a TYPE_PACK_EXPANSION for the
389 template arguments. Its PACK_EXPANSION_PATTERN is "Values&" and its
390 PACK_EXPANSION_PARAMETER_PACKS will contain "Values". */
391DEFTREECODE (TYPE_PACK_EXPANSION, "type_pack_expansion", tcc_type, 0)
392
393/* Represents an expression that will be expanded into a list of
394 expressions when instantiated with one or more argument packs.
395
396 EXPR_PACK_EXPANSION plays precisely the same role as TYPE_PACK_EXPANSION,
397 but will be used for expressions. */
398DEFTREECODE (EXPR_PACK_EXPANSION, "expr_pack_expansion", tcc_expression, 3)
399
400/* Selects the Ith parameter out of an argument pack. This node will
401 be used when instantiating pack expansions; see
402 tsubst_pack_expansion.
403
404 ARGUMENT_PACK_SELECT_FROM_PACK contains the *_ARGUMENT_PACK node
405 from which the argument will be selected.
406
407 ARGUMENT_PACK_SELECT_INDEX contains the index into the argument
408 pack that will be returned by this ARGUMENT_PACK_SELECT node. The
409 index is a machine integer. */
410DEFTREECODE (ARGUMENT_PACK_SELECT, "argument_pack_select", tcc_exceptional, 0)
411
412/* Fold expressions allow the expansion of a template argument pack
413 over a binary operator.
414
415 FOLD_EXPR_MOD_P is true when the fold operation is a compound assignment
416 operator.
417
418 FOLD_EXPR_OP is an INTEGER_CST storing the tree code for the folded
419 expression. Note that when FOLDEXPR_MOD_P is true, the operator is
420 a compound assignment operator for that kind of expression.
421
422 FOLD_EXPR_PACK is an expression containing an unexpanded parameter pack;
423 when expanded, each term becomes an argument of the folded expression.
424
425 In a BINARY_FOLD_EXPRESSION, FOLD_EXPR_INIT is the non-pack argument. */
426DEFTREECODE (UNARY_LEFT_FOLD_EXPR, "unary_left_fold_expr", tcc_expression, 2)
427DEFTREECODE (UNARY_RIGHT_FOLD_EXPR, "unary_right_fold_expr", tcc_expression, 2)
428DEFTREECODE (BINARY_LEFT_FOLD_EXPR, "binary_left_fold_expr", tcc_expression, 3)
429DEFTREECODE (BINARY_RIGHT_FOLD_EXPR, "binary_right_fold_expr", tcc_expression, 3)
430
431/* Represents the __builtin_bit_cast (type, expr) expression.
432 The type is in TREE_TYPE, expression in TREE_OPERAND (bitcast, 0). */
433DEFTREECODE (BIT_CAST_EXPR, "bit_cast_expr", tcc_expression, 1)
434
435/** C++ extensions. */
436
437/* Represents a templated trait that yields an expression. */
438DEFTREECODE (TRAIT_EXPR, "trait_expr", tcc_exceptional, 0)
439
440/* Represents a templated trait that yields a type. */
441DEFTREECODE (TRAIT_TYPE, "trait_type", tcc_type, 0)
442
443/* A lambda expression. This is a C++0x extension.
444 LAMBDA_EXPR_DEFAULT_CAPTURE_MODE is an enum for the default, which may be
445 none.
446 LAMBDA_EXPR_CAPTURE_LIST holds the capture-list, including `this'.
447 LAMBDA_EXPR_THIS_CAPTURE goes straight to the capture of `this', if it exists.
448 LAMBDA_EXPR_PENDING_PROXIES is a vector of capture proxies which need to
449 be pushed once scope returns to the lambda.
450 LAMBDA_EXPR_MUTABLE_P signals whether this lambda was declared mutable. */
451DEFTREECODE (LAMBDA_EXPR, "lambda_expr", tcc_exceptional, 0)
452
453/* The declared type of an expression. This is a C++0x extension.
454 DECLTYPE_TYPE_EXPR is the expression whose type we are computing.
455 DECLTYPE_TYPE_ID_EXPR_OR_MEMBER_ACCESS_P states whether the
456 expression was parsed as an id-expression or a member access
457 expression. When false, it was parsed as a full expression.
458 DECLTYPE_FOR_LAMBDA_CAPTURE is set if we want lambda capture semantics.
459 DECLTYPE_FOR_LAMBDA_RETURN is set if we want lambda return deduction. */
460DEFTREECODE (DECLTYPE_TYPE, "decltype_type", tcc_type, 0)
461
462/* A type designated by one of the bases type traits.
463 BASES_TYPE is the type in question. */
464DEFTREECODE (BASES, "bases", tcc_type, 0)
465
466/* Dependent operator expressions are given this type rather than a NULL_TREE
467 type so that we have somewhere to stash the result of phase 1 name lookup
468 (namely into DEPENDENT_OPERATOR_TYPE_SAVED_LOOKUPS). */
469DEFTREECODE (DEPENDENT_OPERATOR_TYPE, "dependent_operator_type", tcc_type, 0)
470
471/* Used to represent the template information stored by template
472 specializations.
473 The accessors are:
474 TI_TEMPLATE the template declaration associated to the specialization
475 TI_ARGS the arguments of the template specialization
476 TI_TYPEDEFS_NEEDING_ACCESS_CHECKING the vector of typedefs used in
477 the pattern of the template for which access check is needed at template
478 instantiation time. */
479DEFTREECODE (TEMPLATE_INFO, "template_info", tcc_exceptional, 0)
480
481/* OpenMP - #pragma omp depobj
482 Operand 0: OMP_DEPOBJ_DEPOBJ: Depobj expression
483 Operand 1: OMP_DEPOBJ_CLAUSES: List of clauses. */
484DEFTREECODE (OMP_DEPOBJ, "omp_depobj", tcc_statement, 2)
485
486/* Extensions for Concepts. */
487
488/* Used to represent information associated with constrained declarations. */
489DEFTREECODE (CONSTRAINT_INFO, "constraint_info", tcc_exceptional, 0)
490
491/* A wildcard declaration is a placeholder for a template parameter
492 used to resolve constrained-type-names in concepts. During
493 resolution, the matching argument is saved as the TREE_TYPE
494 of the wildcard. */
495DEFTREECODE (WILDCARD_DECL, "wildcard_decl", tcc_declaration, 0)
496
497/* A requires-expr has three operands. The first operand is
498 its parameter list (possibly NULL). The second is a list of
499 requirements, which are denoted by the _REQ* tree codes
500 below. The third is a TREE_VEC of template arguments to
501 be applied when substituting into the parameter list and
502 requirements, set by tsubst_requires_expr for partial instantiations. */
503DEFTREECODE (REQUIRES_EXPR, "requires_expr", tcc_expression, 3)
504
505/* A requirement for an expression. */
506DEFTREECODE (SIMPLE_REQ, "simple_req", tcc_expression, 1)
507
508/* A requirement for a type. */
509DEFTREECODE (TYPE_REQ, "type_req", tcc_expression, 1)
510
511/* A requirement for an expression and its properties. The
512 first operand is the expression, and the 2nd is its type.
513 The accessor COMPOUND_REQ_NOEXCEPT determines whether
514 the noexcept keyword was present. */
515DEFTREECODE (COMPOUND_REQ, "compound_req", tcc_expression, 2)
516
517/* A requires clause within a requires expression. */
518DEFTREECODE (NESTED_REQ, "nested_req", tcc_expression, 1)
519
520/* Constraints are modeled as kinds of expressions.
521 The operands of a constraint can be either types or expressions.
522 Unlike expressions, constraints do not have a type. */
523
524/* An atomic constraint evaluates an expression E. The operand of the
525 constraint is its parameter mapping. The actual expression is stored
526 in the context.
527
528 ATOMIC_CONSTR_INFO provides source info to support diagnostics.
529 ATOMIC_CONSTR_EXPR has the expression to be evaluated.
530 ATOMIC_CONSTR_PARMS is the parameter mapping for the atomic constraint
531 and is stored in the type field. */
532DEFTREECODE (ATOMIC_CONSTR, "atomic_constr", tcc_expression, 1)
533
534/* The conjunction and disjunction of two constraints, respectively.
535 Operands are accessed using TREE_OPERAND. The third operand provides
536 source info for diagnostics.
537
538 CONJ_CONSTR_INFO and DISJ_CONSTR_INFO provide access to the source
539 information of constraints, which is stored in the TREE_TYPE. */
540DEFTREECODE (CONJ_CONSTR, "conj_constr", tcc_expression, 2)
541DEFTREECODE (DISJ_CONSTR, "disj_constr", tcc_expression, 2)
542
543/* A check constraint represents the checking of a concept
544 C. It has two operands: the template defining the concept
545 and a sequence of template arguments.
546
547 CHECK_CONSTR_CONCEPT has the concept definition
548 CHECK_CONSTR_ARGUMENTS are the template arguments */
549DEFTREECODE (CHECK_CONSTR, "check_constr", tcc_expression, 2)
550
551/* The co_await expression is used to support coroutines.
552
553 Op 0 is the cast expresssion (potentially modified by the
554 promise "await_transform()" method).
555 Op1 is a proxy for the temp / coro frame slot 'e' value.
556 Op2 is the initialiser for Op1 (Op0, potentially modified by any
557 applicable 'co_await' operator).
558 Op3 is a vector of the [0] e.ready, [1] e.suspend and [2] e.resume calls.
559 Op4 is a mode : 0 (await) 1 (yield) 2 (initial) 3 (final) */
560DEFTREECODE (CO_AWAIT_EXPR, "co_await", tcc_expression, 5)
561
562/* The co_yield expression is used to support coroutines.
563
564 Op0 is the original expr (for use in diagnostics)
565 Op2 is the co_await derived from this. */
566DEFTREECODE (CO_YIELD_EXPR, "co_yield", tcc_expression, 2)
567
568/* The co_return expression is used to support coroutines.
569
570 Op0 is the original expr, can be void (for use in diagnostics)
571 Op1 is the promise return_xxxx call for for the expression given. */
572
573DEFTREECODE (CO_RETURN_EXPR, "co_return", tcc_statement, 2)
574
575/* Different flavors of contracts.
576
577 Assertions and preconditions have two operands: a node containing
578 the their mode and condition. Postconditions have an additional
579 operand to store the optional name for the result value.
580
581 CONTRACT_SEMANTIC has the computed behavior of the contract. */
582DEFTREECODE (ASSERTION_STMT, "assertion_stmt", tcc_statement, 3)
583DEFTREECODE (PRECONDITION_STMT, "precondition_stmt", tcc_statement, 3)
584DEFTREECODE (POSTCONDITION_STMT, "postcondition_stmt", tcc_statement, 4)
585
586/*
587Local variables:
588mode:c
589End:
590*/
591

source code of gcc/cp/cp-tree.def