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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) 1987-2025 Free Software Foundation, Inc. | |
5 | Hacked by Michael Tiemann (tiemann@cygnus.com) | |
6 | ||
7 | This file is part of GCC. | |
8 | ||
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) | |
12 | any later version. | |
13 | ||
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. | |
18 | ||
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/>. */ | |
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. */ | |
42 | DEFTREECODE (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'. */ | |
47 | DEFTREECODE (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. */ | |
53 | DEFTREECODE (NEW_EXPR, "nw_expr", tcc_expression, 4) | |
54 | DEFTREECODE (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. */ | |
59 | DEFTREECODE (DELETE_EXPR, "dl_expr", tcc_expression, 2) | |
60 | DEFTREECODE (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). */ | |
65 | DEFTREECODE (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). */ | |
70 | DEFTREECODE (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. */ | |
74 | DEFTREECODE (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. */ | |
81 | DEFTREECODE (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. */ | |
86 | DEFTREECODE (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. */ | |
90 | DEFTREECODE (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. */ | |
94 | DEFTREECODE (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. */ | |
108 | DEFTREECODE (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 | */ | |
125 | DEFTREECODE (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. */ | |
160 | DEFTREECODE (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. */ | |
168 | DEFTREECODE (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. */ | |
177 | DEFTREECODE (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. */ | |
183 | DEFTREECODE (TYPENAME_TYPE, "typename_type", tcc_type, 0) | |
184 | ||
185 | /* A type designated by `__typeof (expr)'. TYPEOF_TYPE_EXPR is the | |
186 | expression in question. */ | |
187 | DEFTREECODE (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. */ | |
193 | DEFTREECODE (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. */ | |
201 | DEFTREECODE (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. */ | |
208 | DEFTREECODE (USING_DECL, "using_decl", tcc_declaration, 0) | |
209 | ||
210 | /* A using directive. The operand is USING_STMT_NAMESPACE. */ | |
211 | DEFTREECODE (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. */ | |
217 | DEFTREECODE (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. */ | |
225 | DEFTREECODE (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. */ | |
232 | DEFTREECODE (TEMPLATE_ID_EXPR, "template_id_expr", tcc_expression, 2) | |
233 | ||
234 | /* One of a set of overloaded functions. */ | |
235 | DEFTREECODE (OVERLOAD, "overload", tcc_exceptional, 0) | |
236 | ||
237 | /* A vector of binding slots. */ | |
238 | DEFTREECODE (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. */ | |
250 | DEFTREECODE (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. */ | |
254 | DEFTREECODE (MODOP_EXPR, "modop_expr", tcc_expression, 3) | |
255 | DEFTREECODE (CAST_EXPR, "cast_expr", tcc_unary, 1) | |
256 | DEFTREECODE (REINTERPRET_CAST_EXPR, "reinterpret_cast_expr", tcc_unary, 1) | |
257 | DEFTREECODE (CONST_CAST_EXPR, "const_cast_expr", tcc_unary, 1) | |
258 | DEFTREECODE (STATIC_CAST_EXPR, "static_cast_expr", tcc_unary, 1) | |
259 | DEFTREECODE (DYNAMIC_CAST_EXPR, "dynamic_cast_expr", tcc_unary, 1) | |
260 | DEFTREECODE (IMPLICIT_CONV_EXPR, "implicit_conv_expr", tcc_unary, 1) | |
261 | DEFTREECODE (DOTSTAR_EXPR, "dotstar_expr", tcc_expression, 2) | |
262 | DEFTREECODE (TYPEID_EXPR, "typeid_expr", tcc_expression, 1) | |
263 | DEFTREECODE (NOEXCEPT_EXPR, "noexcept_expr", tcc_unary, 1) | |
264 | DEFTREECODE (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). */ | |
268 | DEFTREECODE (CTOR_INITIALIZER, "ctor_initializer", tcc_expression, 1) | |
269 | ||
270 | DEFTREECODE (TRY_BLOCK, "try_block", tcc_statement, 2) | |
271 | ||
272 | DEFTREECODE (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. */ | |
278 | DEFTREECODE (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). */ | |
283 | DEFTREECODE (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. */ | |
288 | DEFTREECODE (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. */ | |
294 | DEFTREECODE (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. */ | |
300 | DEFTREECODE (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. */ | |
304 | DEFTREECODE (EXPR_STMT, "expr_stmt", tcc_expression, 1) | |
305 | ||
306 | DEFTREECODE (TAG_DEFN, "tag_defn", tcc_expression, 0) | |
307 | ||
308 | /* Represents an 'offsetof' expression during template expansion. */ | |
309 | DEFTREECODE (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. */ | |
314 | DEFTREECODE (ADDRESSOF_EXPR, "addressof_expr", tcc_expression, 1) | |
315 | ||
316 | /* Represents the -> operator during template expansion. */ | |
317 | DEFTREECODE (ARROW_EXPR, "arrow_expr", tcc_expression, 1) | |
318 | ||
319 | /* Represents an '__alignof__' expression during template | |
320 | expansion. */ | |
321 | DEFTREECODE (ALIGNOF_EXPR, "alignof_expr", tcc_expression, 1) | |
322 | ||
323 | /* Represents an Objective-C++ '@encode' expression during template | |
324 | expansion. */ | |
325 | DEFTREECODE (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. */ | |
330 | DEFTREECODE (STMT_EXPR, "stmt_expr", tcc_expression, 1) | |
331 | ||
332 | /* Unary plus. Operand 0 is the expression to which the unary plus | |
333 | is applied. */ | |
334 | DEFTREECODE (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. */ | |
342 | DEFTREECODE (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. */ | |
361 | DEFTREECODE (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"). */ | |
370 | DEFTREECODE (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". */ | |
391 | DEFTREECODE (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. */ | |
398 | DEFTREECODE (EXPR_PACK_EXPANSION, "expr_pack_expansion", tcc_expression, 3) | |
399 | ||
400 | /* Represents a pack index Ts...[I], yielding a type. PACK_INDEX_PACK is | |
401 | the pack expansion Ts, PACK_INDEX_INDEX the index I. */ | |
402 | DEFTREECODE (PACK_INDEX_TYPE, "pack_index_type", tcc_type, 0) | |
403 | ||
404 | /* Represents a pack index Ts...[I], yielding an expression. PACK_INDEX_PACK | |
405 | is the pack expansion Ts, PACK_INDEX_INDEX the index I. */ | |
406 | DEFTREECODE (PACK_INDEX_EXPR, "pack_index_expr", tcc_expression, 2) | |
407 | ||
408 | /* Selects the Ith parameter out of an argument pack. This node will | |
409 | be used when instantiating pack expansions; see | |
410 | tsubst_pack_expansion. | |
411 | ||
412 | ARGUMENT_PACK_SELECT_FROM_PACK contains the *_ARGUMENT_PACK node | |
413 | from which the argument will be selected. | |
414 | ||
415 | ARGUMENT_PACK_SELECT_INDEX contains the index into the argument | |
416 | pack that will be returned by this ARGUMENT_PACK_SELECT node. The | |
417 | index is a machine integer. */ | |
418 | DEFTREECODE (ARGUMENT_PACK_SELECT, "argument_pack_select", tcc_exceptional, 0) | |
419 | ||
420 | /* Fold expressions allow the expansion of a template argument pack | |
421 | over a binary operator. | |
422 | ||
423 | FOLD_EXPR_MODIFY_P is true when the fold operation is a compound assignment | |
424 | operator. | |
425 | ||
426 | FOLD_EXPR_OP is an INTEGER_CST storing the tree code for the folded | |
427 | expression. Note that when FOLD_EXPR_MODIFY_P is true, the operator is | |
428 | a compound assignment operator for that kind of expression. | |
429 | ||
430 | FOLD_EXPR_PACK is an expression containing an unexpanded parameter pack; | |
431 | when expanded, each term becomes an argument of the folded expression. | |
432 | ||
433 | In a BINARY_FOLD_EXPRESSION, FOLD_EXPR_INIT is the non-pack argument. */ | |
434 | DEFTREECODE (UNARY_LEFT_FOLD_EXPR, "unary_left_fold_expr", tcc_expression, 2) | |
435 | DEFTREECODE (UNARY_RIGHT_FOLD_EXPR, "unary_right_fold_expr", tcc_expression, 2) | |
436 | DEFTREECODE (BINARY_LEFT_FOLD_EXPR, "binary_left_fold_expr", tcc_expression, 3) | |
437 | DEFTREECODE (BINARY_RIGHT_FOLD_EXPR, "binary_right_fold_expr", tcc_expression, 3) | |
438 | ||
439 | /* Represents the __builtin_bit_cast (type, expr) expression. | |
440 | The type is in TREE_TYPE, expression in TREE_OPERAND (bitcast, 0). */ | |
441 | DEFTREECODE (BIT_CAST_EXPR, "bit_cast_expr", tcc_expression, 1) | |
442 | ||
443 | /** C++ extensions. */ | |
444 | ||
445 | /* Represents a templated trait that yields an expression. */ | |
446 | DEFTREECODE (TRAIT_EXPR, "trait_expr", tcc_exceptional, 0) | |
447 | ||
448 | /* Represents a templated trait that yields a type. */ | |
449 | DEFTREECODE (TRAIT_TYPE, "trait_type", tcc_type, 0) | |
450 | ||
451 | /* A lambda expression. This is a C++0x extension. | |
452 | LAMBDA_EXPR_DEFAULT_CAPTURE_MODE is an enum for the default, which may be | |
453 | none. | |
454 | LAMBDA_EXPR_CAPTURE_LIST holds the capture-list, including `this'. | |
455 | LAMBDA_EXPR_THIS_CAPTURE goes straight to the capture of `this', if it exists. | |
456 | LAMBDA_EXPR_PENDING_PROXIES is a vector of capture proxies which need to | |
457 | be pushed once scope returns to the lambda. */ | |
458 | DEFTREECODE (LAMBDA_EXPR, "lambda_expr", tcc_exceptional, 0) | |
459 | ||
460 | /* The declared type of an expression. This is a C++0x extension. | |
461 | DECLTYPE_TYPE_EXPR is the expression whose type we are computing. | |
462 | DECLTYPE_TYPE_ID_EXPR_OR_MEMBER_ACCESS_P states whether the | |
463 | expression was parsed as an id-expression or a member access | |
464 | expression. When false, it was parsed as a full expression. | |
465 | DECLTYPE_FOR_LAMBDA_CAPTURE is set if we want lambda capture semantics. | |
466 | DECLTYPE_FOR_LAMBDA_RETURN is set if we want lambda return deduction. */ | |
467 | DEFTREECODE (DECLTYPE_TYPE, "decltype_type", tcc_type, 0) | |
468 | ||
469 | /* A type designated by one of the bases type traits. | |
470 | BASES_TYPE is the type in question. */ | |
471 | DEFTREECODE (BASES, "bases", tcc_type, 0) | |
472 | ||
473 | /* Dependent operator expressions are given this type rather than a NULL_TREE | |
474 | type so that we have somewhere to stash the result of phase 1 name lookup | |
475 | (namely into DEPENDENT_OPERATOR_TYPE_SAVED_LOOKUPS). */ | |
476 | DEFTREECODE (DEPENDENT_OPERATOR_TYPE, "dependent_operator_type", tcc_type, 0) | |
477 | ||
478 | /* Used to represent the template information stored by template | |
479 | specializations. | |
480 | The accessors are: | |
481 | TI_TEMPLATE the template declaration associated to the specialization | |
482 | TI_ARGS the arguments of the template specialization | |
483 | TI_TYPEDEFS_NEEDING_ACCESS_CHECKING the vector of typedefs used in | |
484 | the pattern of the template for which access check is needed at template | |
485 | instantiation time. */ | |
486 | DEFTREECODE (TEMPLATE_INFO, "template_info", tcc_exceptional, 0) | |
487 | ||
488 | /* OpenMP - #pragma omp depobj | |
489 | Operand 0: OMP_DEPOBJ_DEPOBJ: Depobj expression | |
490 | Operand 1: OMP_DEPOBJ_CLAUSES: List of clauses. */ | |
491 | DEFTREECODE (OMP_DEPOBJ, "omp_depobj", tcc_statement, 2) | |
492 | ||
493 | /* Extensions for Concepts. */ | |
494 | ||
495 | /* Used to represent information associated with constrained declarations. */ | |
496 | DEFTREECODE (CONSTRAINT_INFO, "constraint_info", tcc_exceptional, 0) | |
497 | ||
498 | /* A requires-expr has three operands. The first operand is | |
499 | its parameter list (possibly NULL). The second is a list of | |
500 | requirements, which are denoted by the _REQ* tree codes | |
501 | below. The third is a TREE_VEC of template arguments to | |
502 | be applied when substituting into the parameter list and | |
503 | requirements, set by tsubst_requires_expr for partial instantiations. */ | |
504 | DEFTREECODE (REQUIRES_EXPR, "requires_expr", tcc_expression, 3) | |
505 | ||
506 | /* A requirement for an expression. */ | |
507 | DEFTREECODE (SIMPLE_REQ, "simple_req", tcc_expression, 1) | |
508 | ||
509 | /* A requirement for a type. */ | |
510 | DEFTREECODE (TYPE_REQ, "type_req", tcc_expression, 1) | |
511 | ||
512 | /* A requirement for an expression and its properties. The | |
513 | first operand is the expression, and the 2nd is its type. | |
514 | The accessor COMPOUND_REQ_NOEXCEPT determines whether | |
515 | the noexcept keyword was present. */ | |
516 | DEFTREECODE (COMPOUND_REQ, "compound_req", tcc_expression, 2) | |
517 | ||
518 | /* A requires clause within a requires expression. */ | |
519 | DEFTREECODE (NESTED_REQ, "nested_req", tcc_expression, 1) | |
520 | ||
521 | /* Constraints are modeled as kinds of expressions. | |
522 | The operands of a constraint can be either types or expressions. | |
523 | Unlike expressions, constraints do not have a type. */ | |
524 | ||
525 | /* An atomic constraint evaluates an expression E. The operand of the | |
526 | constraint is its parameter mapping. The actual expression is stored | |
527 | in the context. | |
528 | ||
529 | CONSTR_INFO provides source info to support diagnostics. | |
530 | ATOMIC_CONSTR_EXPR has the expression to be evaluated. | |
531 | ATOMIC_CONSTR_MAP is the parameter mapping for the atomic constraint | |
532 | and is stored in the type field. */ | |
533 | DEFTREECODE (ATOMIC_CONSTR, "atomic_constr", tcc_expression, 1) | |
534 | ||
535 | /* The conjunction and disjunction of two constraints, respectively. | |
536 | Operands are accessed using TREE_OPERAND. | |
537 | ||
538 | CONSTR_INFO provides access to the source information of constraints, | |
539 | which is stored in the TREE_TYPE. */ | |
540 | DEFTREECODE (CONJ_CONSTR, "conj_constr", tcc_expression, 2) | |
541 | DEFTREECODE (DISJ_CONSTR, "disj_constr", tcc_expression, 2) | |
542 | ||
543 | /* The co_await expression is used to support coroutines. | |
544 | ||
545 | Op 0 is the cast expresssion (potentially modified by the | |
546 | promise "await_transform()" method). | |
547 | Op1 is a proxy for the temp / coro frame slot 'e' value. | |
548 | Op2 is the initialiser for Op1 (Op0, potentially modified by any | |
549 | applicable 'co_await' operator). | |
550 | Op3 is a vector of the [0] e.ready, [1] e.suspend and [2] e.resume calls. | |
551 | Op4 is a mode : 0 (await) 1 (yield) 2 (initial) 3 (final) */ | |
552 | DEFTREECODE (CO_AWAIT_EXPR, "co_await", tcc_expression, 5) | |
553 | ||
554 | /* The co_yield expression is used to support coroutines. | |
555 | ||
556 | Op0 is the original expr (for use in diagnostics) | |
557 | Op2 is the co_await derived from this. */ | |
558 | DEFTREECODE (CO_YIELD_EXPR, "co_yield", tcc_expression, 2) | |
559 | ||
560 | /* The co_return expression is used to support coroutines. | |
561 | ||
562 | Op0 is the original expr, can be void (for use in diagnostics) | |
563 | Op1 is the promise return_xxxx call for the expression given. */ | |
564 | ||
565 | DEFTREECODE (CO_RETURN_EXPR, "co_return", tcc_statement, 2) | |
566 | ||
567 | /* Different flavors of contracts. | |
568 | ||
569 | Assertions and preconditions have two operands: a node containing | |
570 | the their mode and condition. Postconditions have an additional | |
571 | operand to store the optional name for the result value. | |
572 | ||
573 | CONTRACT_SEMANTIC has the computed behavior of the contract. */ | |
574 | DEFTREECODE (ASSERTION_STMT, "assertion_stmt", tcc_statement, 3) | |
575 | DEFTREECODE (PRECONDITION_STMT, "precondition_stmt", tcc_statement, 3) | |
576 | DEFTREECODE (POSTCONDITION_STMT, "postcondition_stmt", tcc_statement, 4) | |
577 | ||
578 | /* A reference to a translation-unit local entity. | |
579 | ||
580 | This is emitted by modules streaming when writing a TU-local entity that | |
581 | wasn't an exposure (e.g. in a non-inline function template). */ | |
582 | DEFTREECODE (TU_LOCAL_ENTITY, "tu_local_entity", tcc_exceptional, 0) | |
583 | ||
584 | /* | |
585 | Local variables: | |
586 | mode:c | |
587 | End: | |
588 | */ |