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) 1987-2020 Free Software Foundation, Inc.
5 Hacked by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* An OFFSET_REF is used in two situations:
26 1. An expression of the form `A::m' where `A' is a class and `m' is
27 a non-static member. In this case, operand 0 will be a TYPE
28 (corresponding to `A') and operand 1 will be a FIELD_DECL,
29 BASELINK, or TEMPLATE_ID_EXPR (corresponding to `m').
31 The expression is a pointer-to-member if its address is taken,
32 but simply denotes a member of the object if its address is not
35 This form is only used during the parsing phase; once semantic
36 analysis has taken place they are eliminated.
38 2. An expression of the form `x.*p'. In this case, operand 0 will
39 be an expression corresponding to `x' and operand 1 will be an
40 expression with pointer-to-member type. */
41 DEFTREECODE (OFFSET_REF, "offset_ref", tcc_reference, 2)
43 /* A pointer-to-member constant. For a pointer-to-member constant
44 `X::Y' The PTRMEM_CST_CLASS is the RECORD_TYPE for `X' and the
45 PTRMEM_CST_MEMBER is the _DECL for `Y'. */
46 DEFTREECODE (PTRMEM_CST, "ptrmem_cst", tcc_constant, 0)
48 /* For NEW_EXPR, operand 0 is the placement list.
49 Operand 1 is the new-declarator.
50 Operand 2 is the number of elements in the array.
51 Operand 3 is the initializer. */
52 DEFTREECODE (NEW_EXPR, "nw_expr", tcc_expression, 4)
53 DEFTREECODE (VEC_NEW_EXPR, "vec_nw_expr", tcc_expression, 3)
55 /* For DELETE_EXPR, operand 0 is the store to be destroyed.
56 Operand 1 is the value to pass to the destroying function
57 saying whether the store should be deallocated as well. */
58 DEFTREECODE (DELETE_EXPR, "dl_expr", tcc_expression, 2)
59 DEFTREECODE (VEC_DELETE_EXPR, "vec_dl_expr", tcc_expression, 2)
61 /* Value is reference to particular overloaded class method.
62 Operand 0 is the class, operand 1 is the field
63 The COMPLEXITY field holds the class level (usually 0). */
64 DEFTREECODE (SCOPE_REF, "scope_ref", tcc_reference, 2)
66 /* When composing an object with a member, this is the result.
67 Operand 0 is the object. Operand 1 is the member (usually
68 a dereferenced pointer to member). */
69 DEFTREECODE (MEMBER_REF, "member_ref", tcc_reference, 2)
71 /* Type conversion operator in C++. TREE_TYPE is type that this
72 operator converts to. Operand is expression to be converted. */
73 DEFTREECODE (TYPE_EXPR, "type_expr", tcc_expression, 1)
75 /* AGGR_INIT_EXPRs have a variably-sized representation similar to
76 that of CALL_EXPRs. Operand 0 is an INTEGER_CST node containing the
77 operand count, operand 1 is the function which performs initialization,
78 operand 2 is the slot which was allocated for this expression, and
79 the remaining operands are the arguments to the initialization function. */
80 DEFTREECODE (AGGR_INIT_EXPR, "aggr_init_expr", tcc_vl_exp, 3)
82 /* Initialization of an array from another array, expressed at a high level
83 so that it works with TARGET_EXPR. Operand 0 is the target, operand 1
84 is the initializer. */
85 DEFTREECODE (VEC_INIT_EXPR, "vec_init_expr", tcc_expression, 2)
87 /* A throw expression. operand 0 is the expression, if there was one,
88 else it is NULL_TREE. */
89 DEFTREECODE (THROW_EXPR, "throw_expr", tcc_expression, 1)
91 /* An empty class object. The TREE_TYPE gives the class type. We use
92 these to avoid actually creating instances of the empty classes. */
93 DEFTREECODE (EMPTY_CLASS_EXPR, "empty_class_expr", tcc_expression, 0)
95 /* A reference to a member function or member functions from a base
96 class. BASELINK_FUNCTIONS gives the FUNCTION_DECL,
97 TEMPLATE_DECL, OVERLOAD, or TEMPLATE_ID_EXPR corresponding to the
98 functions. BASELINK_BINFO gives the base from which the functions
99 come, i.e., the base to which the `this' pointer must be converted
100 before the functions are called. BASELINK_ACCESS_BINFO gives the
101 base used to name the functions.
103 A BASELINK is an expression; the TREE_TYPE of the BASELINK gives
104 the type of the expression. This type is either a FUNCTION_TYPE,
105 METHOD_TYPE, or `unknown_type_node' indicating that the function is
107 DEFTREECODE (BASELINK, "baselink", tcc_exceptional, 0)
109 /* Template definition. The following fields have the specified uses,
110 although there are other macros in cp-tree.h that should be used for
112 DECL_ARGUMENTS template parm vector
113 DECL_TEMPLATE_INFO template text &c
114 DECL_VINDEX list of instantiations already produced;
115 only done for functions so far
117 DECL_INITIAL associated templates (methods &c)
118 DECL_TEMPLATE_RESULT null
119 For non-class templates:
120 TREE_TYPE type of object to be constructed
121 DECL_TEMPLATE_RESULT decl for object to be created
122 (e.g., FUNCTION_DECL with tmpl parms used)
124 DEFTREECODE (TEMPLATE_DECL, "template_decl", tcc_declaration, 0)
126 /* Index into a template parameter list. The TEMPLATE_PARM_IDX gives
127 the index (from 0) of the parameter, while the TEMPLATE_PARM_LEVEL
128 gives the level (from 1) of the parameter.
132 template <class T> // Index 0, Level 1.
135 template <class U, // Index 0, Level 2.
136 class V> // Index 1, Level 2.
140 The DESCENDANTS will be a chain of TEMPLATE_PARM_INDEXs descended
141 from this one. The first descendant will have the same IDX, but
142 its LEVEL will be one less. The TREE_CHAIN field is used to chain
143 together the descendants. The TEMPLATE_PARM_DECL is the
144 declaration of this parameter, either a TYPE_DECL or CONST_DECL.
145 The TEMPLATE_PARM_ORIG_LEVEL is the LEVEL of the most distant
146 parent, i.e., the LEVEL that the parameter originally had when it
147 was declared. For example, if we instantiate S<int>, we will have:
151 template <class U, // Index 0, Level 1, Orig Level 2
152 class V> // Index 1, Level 1, Orig Level 2
156 The LEVEL is the level of the parameter when we are worrying about
157 the types of things; the ORIG_LEVEL is the level when we are
158 worrying about instantiating things. */
159 DEFTREECODE (TEMPLATE_PARM_INDEX, "template_parm_index", tcc_exceptional, 0)
161 /* Index into a template parameter list for template template parameters.
162 This parameter must be a type. The TYPE_FIELDS value will be a
165 It is used without template arguments like TT in C<TT>,
166 TYPE_NAME is a TEMPLATE_DECL. */
167 DEFTREECODE (TEMPLATE_TEMPLATE_PARM, "template_template_parm", tcc_type, 0)
169 /* The ordering of the following codes is optimized for the checking
170 macros in tree.h. Changing the order will degrade the speed of the
171 compiler. TEMPLATE_TYPE_PARM, TYPENAME_TYPE, TYPEOF_TYPE,
172 BOUND_TEMPLATE_TEMPLATE_PARM. */
174 /* Index into a template parameter list. This parameter must be a type.
175 The type.values field will be a TEMPLATE_PARM_INDEX. */
176 DEFTREECODE (TEMPLATE_TYPE_PARM, "template_type_parm", tcc_type, 0)
178 /* A type designated by `typename T::t'. TYPE_CONTEXT is `T',
179 TYPE_NAME is an IDENTIFIER_NODE for `t'. If the type was named via
180 template-id, TYPENAME_TYPE_FULLNAME will hold the TEMPLATE_ID_EXPR.
181 TREE_TYPE is always NULL. */
182 DEFTREECODE (TYPENAME_TYPE, "typename_type", tcc_type, 0)
184 /* A type designated by `__typeof (expr)'. TYPEOF_TYPE_EXPR is the
185 expression in question. */
186 DEFTREECODE (TYPEOF_TYPE, "typeof_type", tcc_type, 0)
188 /* Like TEMPLATE_TEMPLATE_PARM it is used with bound template arguments
190 In this case, TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO contains the
191 template name and its bound arguments. TYPE_NAME is a TYPE_DECL. */
192 DEFTREECODE (BOUND_TEMPLATE_TEMPLATE_PARM, "bound_template_template_parm",
195 /* For template template argument of the form `T::template C'.
196 TYPE_CONTEXT is `T', the template parameter dependent object.
197 TYPE_NAME is an IDENTIFIER_NODE for `C', the member class template. */
198 DEFTREECODE (UNBOUND_CLASS_TEMPLATE, "unbound_class_template", tcc_type, 0)
200 /* A using declaration. USING_DECL_SCOPE contains the specified
201 scope. In a variadic using-declaration, this is a TYPE_PACK_EXPANSION.
202 In a member using decl, unless DECL_DEPENDENT_P is true,
203 USING_DECL_DECLS contains the _DECL or OVERLOAD so named. This is
204 not an alias, but is later expanded into multiple aliases. */
205 DEFTREECODE (USING_DECL, "using_decl", tcc_declaration, 0)
207 /* A using directive. The operand is USING_STMT_NAMESPACE. */
208 DEFTREECODE (USING_STMT, "using_stmt", tcc_statement, 1)
210 /* An un-parsed operand. Holds a vector of input tokens and
211 a vector of places where the argument was instantiated before
212 parsing had occurred. This is used for default arguments, delayed
213 NSDMIs, and noexcept-specifier parsing. */
214 DEFTREECODE (DEFERRED_PARSE, "deferred_parse", tcc_exceptional, 0)
216 /* An uninstantiated/unevaluated noexcept-specification. For the
217 uninstantiated case, DEFERRED_NOEXCEPT_PATTERN is the pattern from the
218 template, and DEFERRED_NOEXCEPT_ARGS are the template arguments to
219 substitute into the pattern when needed. For the unevaluated case,
220 those slots are NULL_TREE and we use get_defaulted_eh_spec to find
221 the exception-specification. */
222 DEFTREECODE (DEFERRED_NOEXCEPT, "deferred_noexcept", tcc_exceptional, 0)
224 /* A template-id, like foo<int>. The first operand is the template.
225 The second is NULL if there are no explicit arguments, or a
226 TREE_VEC of arguments. The template will be a FUNCTION_DECL,
227 TEMPLATE_DECL, or an OVERLOAD. If the template-id refers to a
228 member template, the template may be an IDENTIFIER_NODE. */
229 DEFTREECODE (TEMPLATE_ID_EXPR, "template_id_expr", tcc_expression, 2)
231 /* One of a set of overloaded functions. */
232 DEFTREECODE (OVERLOAD, "overload", tcc_exceptional, 0)
234 /* A pseudo-destructor, of the form "OBJECT.~DESTRUCTOR" or
235 "OBJECT.SCOPE::~DESTRUCTOR. The first operand is the OBJECT. The
236 second operand (if non-NULL) is the SCOPE. The third operand is
237 the TYPE node corresponding to the DESTRUCTOR. The type of the
238 first operand will always be a scalar type.
240 The type of a PSEUDO_DTOR_EXPR is always "void", even though it can
241 be used as if it were a zero-argument function. We handle the
242 function-call case specially, and giving it "void" type prevents it
243 being used in expressions in ways that are not permitted. */
244 DEFTREECODE (PSEUDO_DTOR_EXPR, "pseudo_dtor_expr", tcc_expression, 3)
246 /* A whole bunch of tree codes for the initial, superficial parsing of
248 DEFTREECODE (MODOP_EXPR, "modop_expr", tcc_expression, 3)
249 DEFTREECODE (CAST_EXPR, "cast_expr", tcc_unary, 1)
250 DEFTREECODE (REINTERPRET_CAST_EXPR, "reinterpret_cast_expr", tcc_unary, 1)
251 DEFTREECODE (CONST_CAST_EXPR, "const_cast_expr", tcc_unary, 1)
252 DEFTREECODE (STATIC_CAST_EXPR, "static_cast_expr", tcc_unary, 1)
253 DEFTREECODE (DYNAMIC_CAST_EXPR, "dynamic_cast_expr", tcc_unary, 1)
254 DEFTREECODE (IMPLICIT_CONV_EXPR, "implicit_conv_expr", tcc_unary, 1)
255 DEFTREECODE (DOTSTAR_EXPR, "dotstar_expr", tcc_expression, 2)
256 DEFTREECODE (TYPEID_EXPR, "typeid_expr", tcc_expression, 1)
257 DEFTREECODE (NOEXCEPT_EXPR, "noexcept_expr", tcc_unary, 1)
258 DEFTREECODE (SPACESHIP_EXPR, "spaceship_expr", tcc_expression, 2)
260 /* A placeholder for an expression that is not type-dependent, but
261 does occur in a template. When an expression that is not
262 type-dependent appears in a larger expression, we must compute the
263 type of that larger expression. That computation would normally
264 modify the original expression, which would change the mangling of
265 that expression if it appeared in a template argument list. In
266 that situation, we create a NON_DEPENDENT_EXPR to take the place of
267 the original expression. The expression is the only operand -- it
268 is only needed for diagnostics. */
269 DEFTREECODE (NON_DEPENDENT_EXPR, "non_dependent_expr", tcc_expression, 1)
271 /* CTOR_INITIALIZER is a placeholder in template code for a call to
272 setup_vtbl_pointer (and appears in all functions, not just ctors). */
273 DEFTREECODE (CTOR_INITIALIZER, "ctor_initializer", tcc_expression, 1)
275 DEFTREECODE (TRY_BLOCK, "try_block", tcc_statement, 2)
277 DEFTREECODE (EH_SPEC_BLOCK, "eh_spec_block", tcc_statement, 2)
279 /* A HANDLER wraps a catch handler for the HANDLER_TYPE. If this is
280 CATCH_ALL_TYPE, then the handler catches all types. The declaration of
281 the catch variable is in HANDLER_PARMS, and the body block in
283 DEFTREECODE (HANDLER, "handler", tcc_statement, 2)
285 /* A MUST_NOT_THROW_EXPR wraps an expression that may not
286 throw, and must call terminate if it does. The second argument
287 is a condition, used in templates to express noexcept (condition). */
288 DEFTREECODE (MUST_NOT_THROW_EXPR, "must_not_throw_expr", tcc_expression, 2)
290 /* A CLEANUP_STMT marks the point at which a declaration is fully
291 constructed. The CLEANUP_EXPR is run on behalf of CLEANUP_DECL
292 when CLEANUP_BODY completes. */
293 DEFTREECODE (CLEANUP_STMT, "cleanup_stmt", tcc_statement, 3)
295 /* Represents an 'if' statement. The operands are IF_COND,
296 THEN_CLAUSE, and ELSE_CLAUSE, and the current scope, respectively. */
297 /* ??? It is currently still necessary to distinguish between IF_STMT
298 and COND_EXPR for the benefit of templates. */
299 DEFTREECODE (IF_STMT, "if_stmt", tcc_statement, 4)
301 /* Used to represent a `for' statement. The operands are
302 FOR_INIT_STMT, FOR_COND, FOR_EXPR, and FOR_BODY, respectively. */
303 DEFTREECODE (FOR_STMT, "for_stmt", tcc_statement, 5)
305 /* Used to represent a range-based `for' statement. The operands are
306 RANGE_FOR_DECL, RANGE_FOR_EXPR, RANGE_FOR_BODY, RANGE_FOR_SCOPE,
307 RANGE_FOR_UNROLL, and RANGE_FOR_INIT_STMT, respectively. Only used in
309 DEFTREECODE (RANGE_FOR_STMT, "range_for_stmt", tcc_statement, 6)
311 /* Used to represent a 'while' statement. The operands are WHILE_COND
312 and WHILE_BODY, respectively. */
313 DEFTREECODE (WHILE_STMT, "while_stmt", tcc_statement, 2)
315 /* Used to represent a 'do' statement. The operands are DO_BODY and
316 DO_COND, respectively. */
317 DEFTREECODE (DO_STMT, "do_stmt", tcc_statement, 2)
319 /* Used to represent a 'break' statement. */
320 DEFTREECODE (BREAK_STMT, "break_stmt", tcc_statement, 0)
322 /* Used to represent a 'continue' statement. */
323 DEFTREECODE (CONTINUE_STMT, "continue_stmt", tcc_statement, 0)
325 /* Used to represent a 'switch' statement. The operands are
326 SWITCH_STMT_COND, SWITCH_STMT_BODY, SWITCH_STMT_TYPE, and
327 SWITCH_STMT_SCOPE, respectively. */
328 DEFTREECODE (SWITCH_STMT, "switch_stmt", tcc_statement, 4)
330 /* Used to represent an expression statement. Use `EXPR_STMT_EXPR' to
331 obtain the expression. */
332 DEFTREECODE (EXPR_STMT, "expr_stmt", tcc_expression, 1)
334 DEFTREECODE (TAG_DEFN, "tag_defn", tcc_expression, 0)
336 /* Represents an 'offsetof' expression during template expansion. */
337 DEFTREECODE (OFFSETOF_EXPR, "offsetof_expr", tcc_expression, 2)
339 /* Represents an '__builtin_addressof' expression during template
340 expansion. This is similar to ADDR_EXPR, but it doesn't invoke
341 overloaded & operators. */
342 DEFTREECODE (ADDRESSOF_EXPR, "addressof_expr", tcc_expression, 1)
344 /* Represents the -> operator during template expansion. */
345 DEFTREECODE (ARROW_EXPR, "arrow_expr", tcc_expression, 1)
347 /* Represents an '__alignof__' expression during template
349 DEFTREECODE (ALIGNOF_EXPR, "alignof_expr", tcc_expression, 1)
351 /* Represents an Objective-C++ '@encode' expression during template
353 DEFTREECODE (AT_ENCODE_EXPR, "at_encode_expr", tcc_expression, 1)
355 /* A STMT_EXPR represents a statement-expression during template
356 expansion. This is the GCC extension { ( ... ) }. The
357 STMT_EXPR_STMT is the statement given by the expression. */
358 DEFTREECODE (STMT_EXPR, "stmt_expr", tcc_expression, 1)
360 /* Unary plus. Operand 0 is the expression to which the unary plus
362 DEFTREECODE (UNARY_PLUS_EXPR, "unary_plus_expr", tcc_unary, 1)
364 /** C++11 extensions. */
366 /* A static assertion. This is a C++11 extension.
367 STATIC_ASSERT_CONDITION contains the condition that is being
368 checked. STATIC_ASSERT_MESSAGE contains the message (a string
369 literal) to be displayed if the condition fails to hold. */
370 DEFTREECODE (STATIC_ASSERT, "static_assert", tcc_exceptional, 0)
372 /* Represents an argument pack of types (or templates). An argument
373 pack stores zero or more arguments that will be used to instantiate
376 ARGUMENT_PACK_ARGS retrieves the arguments stored in the argument
380 template<typename... Values>
383 tuple<int, float, double> t;
385 Values is a (template) parameter pack. When tuple<int, float,
386 double> is instantiated, the Values parameter pack is instantiated
387 with the argument pack <int, float, double>. ARGUMENT_PACK_ARGS will
388 be a TREE_VEC containing int, float, and double. */
389 DEFTREECODE (TYPE_ARGUMENT_PACK, "type_argument_pack", tcc_type, 0)
391 /* Represents an argument pack of values, which can be used either for
392 non-type template arguments or function call arguments.
394 NONTYPE_ARGUMENT_PACK plays precisely the same role as
395 TYPE_ARGUMENT_PACK, but will be used for packing non-type template
396 arguments (e.g., "int... Dimensions") or function arguments ("const
398 DEFTREECODE (NONTYPE_ARGUMENT_PACK, "nontype_argument_pack", tcc_expression, 1)
400 /* Represents a type expression that will be expanded into a list of
401 types when instantiated with one or more argument packs.
403 PACK_EXPANSION_PATTERN retrieves the expansion pattern. This is
404 the type or expression that we will substitute into with each
405 argument in an argument pack.
407 SET_PACK_EXPANSION_PATTERN sets the expansion pattern.
409 PACK_EXPANSION_PARAMETER_PACKS contains a TREE_LIST of the parameter
410 packs that are used in this pack expansion.
413 template<typename... Values>
414 struct tied : tuple<Values&...> {
418 The derivation from tuple contains a TYPE_PACK_EXPANSION for the
419 template arguments. Its PACK_EXPANSION_PATTERN is "Values&" and its
420 PACK_EXPANSION_PARAMETER_PACKS will contain "Values". */
421 DEFTREECODE (TYPE_PACK_EXPANSION, "type_pack_expansion", tcc_type, 0)
423 /* Represents an expression that will be expanded into a list of
424 expressions when instantiated with one or more argument packs.
426 EXPR_PACK_EXPANSION plays precisely the same role as TYPE_PACK_EXPANSION,
427 but will be used for expressions. */
428 DEFTREECODE (EXPR_PACK_EXPANSION, "expr_pack_expansion", tcc_expression, 3)
430 /* Selects the Ith parameter out of an argument pack. This node will
431 be used when instantiating pack expansions; see
432 tsubst_pack_expansion.
434 ARGUMENT_PACK_SELECT_FROM_PACK contains the *_ARGUMENT_PACK node
435 from which the argument will be selected.
437 ARGUMENT_PACK_SELECT_INDEX contains the index into the argument
438 pack that will be returned by this ARGUMENT_PACK_SELECT node. The
439 index is a machine integer. */
440 DEFTREECODE (ARGUMENT_PACK_SELECT, "argument_pack_select", tcc_exceptional, 0)
442 /* Fold expressions allow the expansion of a template argument pack
443 over a binary operator.
445 FOLD_EXPR_MOD_P is true when the fold operation is a compound assignment
448 FOLD_EXPR_OP is an INTEGER_CST storing the tree code for the folded
449 expression. Note that when FOLDEXPR_MOD_P is true, the operator is
450 a compound assignment operator for that kind of expression.
452 FOLD_EXPR_PACK is an expression containing an unexpanded parameter pack;
453 when expanded, each term becomes an argument of the folded expression.
455 In a BINARY_FOLD_EXPRESSION, FOLD_EXPR_INIT is the non-pack argument. */
456 DEFTREECODE (UNARY_LEFT_FOLD_EXPR, "unary_left_fold_expr", tcc_expression, 2)
457 DEFTREECODE (UNARY_RIGHT_FOLD_EXPR, "unary_right_fold_expr", tcc_expression, 2)
458 DEFTREECODE (BINARY_LEFT_FOLD_EXPR, "binary_left_fold_expr", tcc_expression, 3)
459 DEFTREECODE (BINARY_RIGHT_FOLD_EXPR, "binary_right_fold_expr", tcc_expression, 3)
462 /** C++ extensions. */
464 /* Represents a trait expression during template expansion. */
465 DEFTREECODE (TRAIT_EXPR, "trait_expr", tcc_exceptional, 0)
467 /* A lambda expression. This is a C++0x extension.
468 LAMBDA_EXPR_DEFAULT_CAPTURE_MODE is an enum for the default, which may be
470 LAMBDA_EXPR_CAPTURE_LIST holds the capture-list, including `this'.
471 LAMBDA_EXPR_THIS_CAPTURE goes straight to the capture of `this', if it exists.
472 LAMBDA_EXPR_PENDING_PROXIES is a vector of capture proxies which need to
473 be pushed once scope returns to the lambda.
474 LAMBDA_EXPR_MUTABLE_P signals whether this lambda was declared mutable. */
475 DEFTREECODE (LAMBDA_EXPR, "lambda_expr", tcc_exceptional, 0)
477 /* The declared type of an expression. This is a C++0x extension.
478 DECLTYPE_TYPE_EXPR is the expression whose type we are computing.
479 DECLTYPE_TYPE_ID_EXPR_OR_MEMBER_ACCESS_P states whether the
480 expression was parsed as an id-expression or a member access
481 expression. When false, it was parsed as a full expression.
482 DECLTYPE_FOR_LAMBDA_CAPTURE is set if we want lambda capture semantics.
483 DECLTYPE_FOR_LAMBDA_RETURN is set if we want lambda return deduction. */
484 DEFTREECODE (DECLTYPE_TYPE, "decltype_type", tcc_type, 0)
486 /* A type designated by `__underlying_type (type)'.
487 UNDERLYING_TYPE_TYPE is the type in question. */
488 DEFTREECODE (UNDERLYING_TYPE, "underlying_type", tcc_type, 0)
490 /* A type designated by one of the bases type traits.
491 BASES_TYPE is the type in question. */
492 DEFTREECODE (BASES, "bases", tcc_type, 0)
494 /* Used to represent the template information stored by template
497 TI_TEMPLATE the template declaration associated to the specialization
498 TI_ARGS the arguments of the template specialization
499 TI_TYPEDEFS_NEEDING_ACCESS_CHECKING the vector of typedefs used in
500 the pattern of the template for which access check is needed at template
501 instantiation time. */
502 DEFTREECODE (TEMPLATE_INFO, "template_info", tcc_exceptional, 0)
504 /* OpenMP - #pragma omp depobj
505 Operand 0: OMP_DEPOBJ_DEPOBJ: Depobj expression
506 Operand 1: OMP_DEPOBJ_CLAUSES: List of clauses. */
507 DEFTREECODE (OMP_DEPOBJ, "omp_depobj", tcc_statement, 2)
509 /* Extensions for Concepts. */
511 /* Concept definition. This is not entirely different than a VAR_DECL
512 except that a) it must be a template, and b) doesn't have the wide
513 range of value and linkage options available to variables. */
514 DEFTREECODE (CONCEPT_DECL, "concept_decl", tcc_declaration, 0)
516 /* Used to represent information associated with constrained declarations. */
517 DEFTREECODE (CONSTRAINT_INFO, "constraint_info", tcc_exceptional, 0)
519 /* A wildcard declaration is a placeholder for a template parameter
520 used to resolve constrained-type-names in concepts. During
521 resolution, the matching argument is saved as the TREE_TYPE
523 DEFTREECODE (WILDCARD_DECL, "wildcard_decl", tcc_declaration, 0)
525 /* A requires-expr is a binary expression. The first operand is
526 its parameter list (possibly NULL). The second is a list of
527 requirements, which are denoted by the _REQ* tree codes
529 DEFTREECODE (REQUIRES_EXPR, "requires_expr", tcc_expression, 2)
531 /* A requirement for an expression. */
532 DEFTREECODE (SIMPLE_REQ, "simple_req", tcc_expression, 1)
534 /* A requirement for a type. */
535 DEFTREECODE (TYPE_REQ, "type_req", tcc_expression, 1)
537 /* A requirement for an expression and its properties. The
538 first operand is the expression, and the 2nd is its type.
539 The accessor COMPOUND_REQ_NOEXCEPT determines whether
540 the noexcept keyword was present. */
541 DEFTREECODE (COMPOUND_REQ, "compound_req", tcc_expression, 2)
543 /* A requires clause within a requires expression. */
544 DEFTREECODE (NESTED_REQ, "nested_req", tcc_expression, 1)
546 /* Constraints are modeled as kinds of expressions.
547 The operands of a constraint can be either types or expressions.
548 Unlike expressions, constraints do not have a type. */
550 /* An atomic constraint evaluates an expression E. The operand of the
551 constraint is its parameter mapping. The actual expression is stored
554 ATOMIC_CONSTR_INFO provides source info to support diagnostics.
555 ATOMIC_CONSTR_EXPR has the expression to be evaluated.
556 ATOMIC_CONSTR_PARMS is the parameter mapping for the atomic constraint
557 and is stored in the type field. */
558 DEFTREECODE (ATOMIC_CONSTR, "atomic_constr", tcc_expression, 1)
560 /* The conjunction and disjunction of two constraints, respectively.
561 Operands are accessed using TREE_OPERAND. The third operand provides
562 source info for diagnostics.
564 CONJ_CONSTR_INFO and DISJ_CONSTR_INFO provide access to the source
565 information of constraints, which is stored in the TREE_TYPE. */
566 DEFTREECODE (CONJ_CONSTR, "conj_constr", tcc_expression, 2)
567 DEFTREECODE (DISJ_CONSTR, "disj_constr", tcc_expression, 2)
569 /* A check constraint represents the checking of a concept
570 C. It has two operands: the template defining the concept
571 and a sequence of template arguments.
573 CHECK_CONSTR_CONCEPT has the concept definition
574 CHECK_CONSTR_ARGUMENTS are the template arguments */
575 DEFTREECODE (CHECK_CONSTR, "check_constr", tcc_expression, 2)