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 | |
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 | /* 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. */ |
410 | DEFTREECODE (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. */ |
426 | DEFTREECODE (UNARY_LEFT_FOLD_EXPR, "unary_left_fold_expr" , tcc_expression, 2) |
427 | DEFTREECODE (UNARY_RIGHT_FOLD_EXPR, "unary_right_fold_expr" , tcc_expression, 2) |
428 | DEFTREECODE (BINARY_LEFT_FOLD_EXPR, "binary_left_fold_expr" , tcc_expression, 3) |
429 | DEFTREECODE (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). */ |
433 | DEFTREECODE (BIT_CAST_EXPR, "bit_cast_expr" , tcc_expression, 1) |
434 | |
435 | /** C++ extensions. */ |
436 | |
437 | /* Represents a templated trait that yields an expression. */ |
438 | DEFTREECODE (TRAIT_EXPR, "trait_expr" , tcc_exceptional, 0) |
439 | |
440 | /* Represents a templated trait that yields a type. */ |
441 | DEFTREECODE (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. */ |
451 | DEFTREECODE (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. */ |
460 | DEFTREECODE (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. */ |
464 | DEFTREECODE (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). */ |
469 | DEFTREECODE (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. */ |
479 | DEFTREECODE (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. */ |
484 | DEFTREECODE (OMP_DEPOBJ, "omp_depobj" , tcc_statement, 2) |
485 | |
486 | /* Extensions for Concepts. */ |
487 | |
488 | /* Used to represent information associated with constrained declarations. */ |
489 | DEFTREECODE (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. */ |
495 | DEFTREECODE (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. */ |
503 | DEFTREECODE (REQUIRES_EXPR, "requires_expr" , tcc_expression, 3) |
504 | |
505 | /* A requirement for an expression. */ |
506 | DEFTREECODE (SIMPLE_REQ, "simple_req" , tcc_expression, 1) |
507 | |
508 | /* A requirement for a type. */ |
509 | DEFTREECODE (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. */ |
515 | DEFTREECODE (COMPOUND_REQ, "compound_req" , tcc_expression, 2) |
516 | |
517 | /* A requires clause within a requires expression. */ |
518 | DEFTREECODE (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. */ |
532 | DEFTREECODE (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. */ |
540 | DEFTREECODE (CONJ_CONSTR, "conj_constr" , tcc_expression, 2) |
541 | DEFTREECODE (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 */ |
549 | DEFTREECODE (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) */ |
560 | DEFTREECODE (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. */ |
566 | DEFTREECODE (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 | |
573 | DEFTREECODE (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. */ |
582 | DEFTREECODE (ASSERTION_STMT, "assertion_stmt" , tcc_statement, 3) |
583 | DEFTREECODE (PRECONDITION_STMT, "precondition_stmt" , tcc_statement, 3) |
584 | DEFTREECODE (POSTCONDITION_STMT, "postcondition_stmt" , tcc_statement, 4) |
585 | |
586 | /* |
587 | Local variables: |
588 | mode:c |
589 | End: |
590 | */ |
591 | |