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) 1987-2017 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. 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'). |

30 | |

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 |

33 | taken. |

34 | |

35 | This form is only used during the parsing phase; once semantic |

36 | analysis has taken place they are eliminated. |

37 | |

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) |

42 | |

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) |

47 | |

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) |

54 | |

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) |

60 | |

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) |

65 | |

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) |

70 | |

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) |

74 | |

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) |

81 | |

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) |

86 | |

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) |

90 | |

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) |

94 | |

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. |

102 | |

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 |

106 | overloaded. */ |

107 | DEFTREECODE (BASELINK, "baselink", tcc_exceptional, 0) |

108 | |

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 |

111 | accessing this data. |

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 |

116 | For class template: |

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) |

123 | */ |

124 | DEFTREECODE (TEMPLATE_DECL, "template_decl", tcc_declaration, 0) |

125 | |

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. |

129 | |

130 | Here's an example: |

131 | |

132 | template <class T> // Index 0, Level 1. |

133 | struct S |

134 | { |

135 | template <class U, // Index 0, Level 2. |

136 | class V> // Index 1, Level 2. |

137 | void f(); |

138 | }; |

139 | |

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: |

148 | |

149 | struct S<int> |

150 | { |

151 | template <class U, // Index 0, Level 1, Orig Level 2 |

152 | class V> // Index 1, Level 1, Orig Level 2 |

153 | void f(); |

154 | }; |

155 | |

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) |

160 | |

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 |

163 | TEMPLATE_PARM_INDEX. |

164 | |

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) |

168 | |

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. */ |

173 | |

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) |

177 | |

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) |

183 | |

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) |

187 | |

188 | /* Like TEMPLATE_TEMPLATE_PARM it is used with bound template arguments |

189 | like TT<int>. |

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", |

193 | tcc_type, 0) |

194 | |

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) |

199 | |

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) |

206 | |

207 | /* A using directive. The operand is USING_STMT_NAMESPACE. */ |

208 | DEFTREECODE (USING_STMT, "using_stmt", tcc_statement, 1) |

209 | |

210 | /* An un-parsed default argument. Holds a vector of input tokens and |

211 | a vector of places where the argument was instantiated before |

212 | parsing had occurred. */ |

213 | DEFTREECODE (DEFAULT_ARG, "default_arg", tcc_exceptional, 0) |

214 | |

215 | /* An uninstantiated/unevaluated noexcept-specification. For the |

216 | uninstantiated case, DEFERRED_NOEXCEPT_PATTERN is the pattern from the |

217 | template, and DEFERRED_NOEXCEPT_ARGS are the template arguments to |

218 | substitute into the pattern when needed. For the unevaluated case, |

219 | those slots are NULL_TREE and we use get_defaulted_eh_spec to find |

220 | the exception-specification. */ |

221 | DEFTREECODE (DEFERRED_NOEXCEPT, "deferred_noexcept", tcc_exceptional, 0) |

222 | |

223 | /* A template-id, like foo<int>. The first operand is the template. |

224 | The second is NULL if there are no explicit arguments, or a |

225 | TREE_VEC of arguments. The template will be a FUNCTION_DECL, |

226 | TEMPLATE_DECL, or an OVERLOAD. If the template-id refers to a |

227 | member template, the template may be an IDENTIFIER_NODE. */ |

228 | DEFTREECODE (TEMPLATE_ID_EXPR, "template_id_expr", tcc_expression, 2) |

229 | |

230 | /* One of a set of overloaded functions. */ |

231 | DEFTREECODE (OVERLOAD, "overload", tcc_exceptional, 0) |

232 | |

233 | /* A pseudo-destructor, of the form "OBJECT.~DESTRUCTOR" or |

234 | "OBJECT.SCOPE::~DESTRUCTOR. The first operand is the OBJECT. The |

235 | second operand (if non-NULL) is the SCOPE. The third operand is |

236 | the TYPE node corresponding to the DESTRUCTOR. The type of the |

237 | first operand will always be a scalar type. |

238 | |

239 | The type of a PSEUDO_DTOR_EXPR is always "void", even though it can |

240 | be used as if it were a zero-argument function. We handle the |

241 | function-call case specially, and giving it "void" type prevents it |

242 | being used in expressions in ways that are not permitted. */ |

243 | DEFTREECODE (PSEUDO_DTOR_EXPR, "pseudo_dtor_expr", tcc_expression, 3) |

244 | |

245 | /* A whole bunch of tree codes for the initial, superficial parsing of |

246 | templates. */ |

247 | DEFTREECODE (MODOP_EXPR, "modop_expr", tcc_expression, 3) |

248 | DEFTREECODE (CAST_EXPR, "cast_expr", tcc_unary, 1) |

249 | DEFTREECODE (REINTERPRET_CAST_EXPR, "reinterpret_cast_expr", tcc_unary, 1) |

250 | DEFTREECODE (CONST_CAST_EXPR, "const_cast_expr", tcc_unary, 1) |

251 | DEFTREECODE (STATIC_CAST_EXPR, "static_cast_expr", tcc_unary, 1) |

252 | DEFTREECODE (DYNAMIC_CAST_EXPR, "dynamic_cast_expr", tcc_unary, 1) |

253 | DEFTREECODE (IMPLICIT_CONV_EXPR, "implicit_conv_expr", tcc_unary, 1) |

254 | DEFTREECODE (DOTSTAR_EXPR, "dotstar_expr", tcc_expression, 2) |

255 | DEFTREECODE (TYPEID_EXPR, "typeid_expr", tcc_expression, 1) |

256 | DEFTREECODE (NOEXCEPT_EXPR, "noexcept_expr", tcc_unary, 1) |

257 | |

258 | /* A placeholder for an expression that is not type-dependent, but |

259 | does occur in a template. When an expression that is not |

260 | type-dependent appears in a larger expression, we must compute the |

261 | type of that larger expression. That computation would normally |

262 | modify the original expression, which would change the mangling of |

263 | that expression if it appeared in a template argument list. In |

264 | that situation, we create a NON_DEPENDENT_EXPR to take the place of |

265 | the original expression. The expression is the only operand -- it |

266 | is only needed for diagnostics. */ |

267 | DEFTREECODE (NON_DEPENDENT_EXPR, "non_dependent_expr", tcc_expression, 1) |

268 | |

269 | /* CTOR_INITIALIZER is a placeholder in template code for a call to |

270 | setup_vtbl_pointer (and appears in all functions, not just ctors). */ |

271 | DEFTREECODE (CTOR_INITIALIZER, "ctor_initializer", tcc_expression, 1) |

272 | |

273 | DEFTREECODE (TRY_BLOCK, "try_block", tcc_statement, 2) |

274 | |

275 | DEFTREECODE (EH_SPEC_BLOCK, "eh_spec_block", tcc_statement, 2) |

276 | |

277 | /* A HANDLER wraps a catch handler for the HANDLER_TYPE. If this is |

278 | CATCH_ALL_TYPE, then the handler catches all types. The declaration of |

279 | the catch variable is in HANDLER_PARMS, and the body block in |

280 | HANDLER_BODY. */ |

281 | DEFTREECODE (HANDLER, "handler", tcc_statement, 2) |

282 | |

283 | /* A MUST_NOT_THROW_EXPR wraps an expression that may not |

284 | throw, and must call terminate if it does. The second argument |

285 | is a condition, used in templates to express noexcept (condition). */ |

286 | DEFTREECODE (MUST_NOT_THROW_EXPR, "must_not_throw_expr", tcc_expression, 2) |

287 | |

288 | /* A CLEANUP_STMT marks the point at which a declaration is fully |

289 | constructed. The CLEANUP_EXPR is run on behalf of CLEANUP_DECL |

290 | when CLEANUP_BODY completes. */ |

291 | DEFTREECODE (CLEANUP_STMT, "cleanup_stmt", tcc_statement, 3) |

292 | |

293 | /* Represents an 'if' statement. The operands are IF_COND, |

294 | THEN_CLAUSE, and ELSE_CLAUSE, and the current scope, respectively. */ |

295 | /* ??? It is currently still necessary to distinguish between IF_STMT |

296 | and COND_EXPR for the benefit of templates. */ |

297 | DEFTREECODE (IF_STMT, "if_stmt", tcc_statement, 4) |

298 | |

299 | /* Used to represent a `for' statement. The operands are |

300 | FOR_INIT_STMT, FOR_COND, FOR_EXPR, and FOR_BODY, respectively. */ |

301 | DEFTREECODE (FOR_STMT, "for_stmt", tcc_statement, 5) |

302 | |

303 | /* Used to represent a range-based `for' statement. The operands are |

304 | RANGE_FOR_DECL, RANGE_FOR_EXPR, RANGE_FOR_BODY, and RANGE_FOR_SCOPE, |

305 | respectively. Only used in templates. */ |

306 | DEFTREECODE (RANGE_FOR_STMT, "range_for_stmt", tcc_statement, 4) |

307 | |

308 | /* Used to represent a 'while' statement. The operands are WHILE_COND |

309 | and WHILE_BODY, respectively. */ |

310 | DEFTREECODE (WHILE_STMT, "while_stmt", tcc_statement, 2) |

311 | |

312 | /* Used to represent a 'do' statement. The operands are DO_BODY and |

313 | DO_COND, respectively. */ |

314 | DEFTREECODE (DO_STMT, "do_stmt", tcc_statement, 2) |

315 | |

316 | /* Used to represent a 'break' statement. */ |

317 | DEFTREECODE (BREAK_STMT, "break_stmt", tcc_statement, 0) |

318 | |

319 | /* Used to represent a 'continue' statement. */ |

320 | DEFTREECODE (CONTINUE_STMT, "continue_stmt", tcc_statement, 0) |

321 | |

322 | /* Used to represent a 'switch' statement. The operands are |

323 | SWITCH_STMT_COND, SWITCH_STMT_BODY, SWITCH_STMT_TYPE, and |

324 | SWITCH_STMT_SCOPE, respectively. */ |

325 | DEFTREECODE (SWITCH_STMT, "switch_stmt", tcc_statement, 4) |

326 | |

327 | /* Used to represent an expression statement. Use `EXPR_STMT_EXPR' to |

328 | obtain the expression. */ |

329 | DEFTREECODE (EXPR_STMT, "expr_stmt", tcc_expression, 1) |

330 | |

331 | DEFTREECODE (TAG_DEFN, "tag_defn", tcc_expression, 0) |

332 | |

333 | /* Represents an 'offsetof' expression during template expansion. */ |

334 | DEFTREECODE (OFFSETOF_EXPR, "offsetof_expr", tcc_expression, 2) |

335 | |

336 | /* Represents an '__builtin_addressof' expression during template |

337 | expansion. This is similar to ADDR_EXPR, but it doesn't invoke |

338 | overloaded & operators. */ |

339 | DEFTREECODE (ADDRESSOF_EXPR, "addressof_expr", tcc_expression, 1) |

340 | |

341 | /* Represents the -> operator during template expansion. */ |

342 | DEFTREECODE (ARROW_EXPR, "arrow_expr", tcc_expression, 1) |

343 | |

344 | /* Represents an '__alignof__' expression during template |

345 | expansion. */ |

346 | DEFTREECODE (ALIGNOF_EXPR, "alignof_expr", tcc_expression, 1) |

347 | |

348 | /* Represents an Objective-C++ '@encode' expression during template |

349 | expansion. */ |

350 | DEFTREECODE (AT_ENCODE_EXPR, "at_encode_expr", tcc_expression, 1) |

351 | |

352 | /* A STMT_EXPR represents a statement-expression during template |

353 | expansion. This is the GCC extension { ( ... ) }. The |

354 | STMT_EXPR_STMT is the statement given by the expression. */ |

355 | DEFTREECODE (STMT_EXPR, "stmt_expr", tcc_expression, 1) |

356 | |

357 | /* Unary plus. Operand 0 is the expression to which the unary plus |

358 | is applied. */ |

359 | DEFTREECODE (UNARY_PLUS_EXPR, "unary_plus_expr", tcc_unary, 1) |

360 | |

361 | /** C++11 extensions. */ |

362 | |

363 | /* A static assertion. This is a C++11 extension. |

364 | STATIC_ASSERT_CONDITION contains the condition that is being |

365 | checked. STATIC_ASSERT_MESSAGE contains the message (a string |

366 | literal) to be displayed if the condition fails to hold. */ |

367 | DEFTREECODE (STATIC_ASSERT, "static_assert", tcc_exceptional, 0) |

368 | |

369 | /* Represents an argument pack of types (or templates). An argument |

370 | pack stores zero or more arguments that will be used to instantiate |

371 | a parameter pack. |

372 | |

373 | ARGUMENT_PACK_ARGS retrieves the arguments stored in the argument |

374 | pack. |

375 | |

376 | Example: |

377 | template<typename... Values> |

378 | class tuple { ... }; |

379 | |

380 | tuple<int, float, double> t; |

381 | |

382 | Values is a (template) parameter pack. When tuple<int, float, |

383 | double> is instantiated, the Values parameter pack is instantiated |

384 | with the argument pack <int, float, double>. ARGUMENT_PACK_ARGS will |

385 | be a TREE_VEC containing int, float, and double. */ |

386 | DEFTREECODE (TYPE_ARGUMENT_PACK, "type_argument_pack", tcc_type, 0) |

387 | |

388 | /* Represents an argument pack of values, which can be used either for |

389 | non-type template arguments or function call arguments. |

390 | |

391 | NONTYPE_ARGUMENT_PACK plays precisely the same role as |

392 | TYPE_ARGUMENT_PACK, but will be used for packing non-type template |

393 | arguments (e.g., "int... Dimensions") or function arguments ("const |

394 | Args&... args"). */ |

395 | DEFTREECODE (NONTYPE_ARGUMENT_PACK, "nontype_argument_pack", tcc_expression, 1) |

396 | |

397 | /* Represents a type expression that will be expanded into a list of |

398 | types when instantiated with one or more argument packs. |

399 | |

400 | PACK_EXPANSION_PATTERN retrieves the expansion pattern. This is |

401 | the type or expression that we will substitute into with each |

402 | argument in an argument pack. |

403 | |

404 | SET_PACK_EXPANSION_PATTERN sets the expansion pattern. |

405 | |

406 | PACK_EXPANSION_PARAMETER_PACKS contains a TREE_LIST of the parameter |

407 | packs that are used in this pack expansion. |

408 | |

409 | Example: |

410 | template<typename... Values> |

411 | struct tied : tuple<Values&...> { |

412 | // ... |

413 | }; |

414 | |

415 | The derivation from tuple contains a TYPE_PACK_EXPANSION for the |

416 | template arguments. Its PACK_EXPANSION_PATTERN is "Values&" and its |

417 | PACK_EXPANSION_PARAMETER_PACKS will contain "Values". */ |

418 | DEFTREECODE (TYPE_PACK_EXPANSION, "type_pack_expansion", tcc_type, 0) |

419 | |

420 | /* Represents an expression that will be expanded into a list of |

421 | expressions when instantiated with one or more argument packs. |

422 | |

423 | EXPR_PACK_EXPANSION plays precisely the same role as TYPE_PACK_EXPANSION, |

424 | but will be used for expressions. */ |

425 | DEFTREECODE (EXPR_PACK_EXPANSION, "expr_pack_expansion", tcc_expression, 3) |

426 | |

427 | /* Selects the Ith parameter out of an argument pack. This node will |

428 | be used when instantiating pack expansions; see |

429 | tsubst_pack_expansion. |

430 | |

431 | ARGUMENT_PACK_SELECT_FROM_PACK contains the *_ARGUMENT_PACK node |

432 | from which the argument will be selected. |

433 | |

434 | ARGUMENT_PACK_SELECT_INDEX contains the index into the argument |

435 | pack that will be returned by this ARGUMENT_PACK_SELECT node. The |

436 | index is a machine integer. */ |

437 | DEFTREECODE (ARGUMENT_PACK_SELECT, "argument_pack_select", tcc_exceptional, 0) |

438 | |

439 | /* Fold expressions allow the expansion of a template argument pack |

440 | over a binary operator. |

441 | |

442 | FOLD_EXPR_MOD_P is true when the fold operation is a compound assignment |

443 | operator. |

444 | |

445 | FOLD_EXPR_OP is an INTEGER_CST storing the tree code for the folded |

446 | expression. Note that when FOLDEXPR_MOD_P is true, the operator is |

447 | a compound assignment operator for that kind of expression. |

448 | |

449 | FOLD_EXPR_PACK is an expression containing an unexpanded parameter pack; |

450 | when expanded, each term becomes an argument of the folded expression. |

451 | |

452 | In a BINARY_FOLD_EXPRESSION, FOLD_EXPR_INIT is the non-pack argument. */ |

453 | DEFTREECODE (UNARY_LEFT_FOLD_EXPR, "unary_left_fold_expr", tcc_expression, 2) |

454 | DEFTREECODE (UNARY_RIGHT_FOLD_EXPR, "unary_right_fold_expr", tcc_expression, 2) |

455 | DEFTREECODE (BINARY_LEFT_FOLD_EXPR, "binary_left_fold_expr", tcc_expression, 3) |

456 | DEFTREECODE (BINARY_RIGHT_FOLD_EXPR, "binary_right_fold_expr", tcc_expression, 3) |

457 | |

458 | |

459 | /** C++ extensions. */ |

460 | |

461 | /* Represents a trait expression during template expansion. */ |

462 | DEFTREECODE (TRAIT_EXPR, "trait_expr", tcc_exceptional, 0) |

463 | |

464 | /* A lambda expression. This is a C++0x extension. |

465 | LAMBDA_EXPR_DEFAULT_CAPTURE_MODE is an enum for the default, which may be |

466 | none. |

467 | LAMBDA_EXPR_CAPTURE_LIST holds the capture-list, including `this'. |

468 | LAMBDA_EXPR_THIS_CAPTURE goes straight to the capture of `this', if it exists. |

469 | LAMBDA_EXPR_PENDING_PROXIES is a vector of capture proxies which need to |

470 | be pushed once scope returns to the lambda. |

471 | LAMBDA_EXPR_MUTABLE_P signals whether this lambda was declared mutable. */ |

472 | DEFTREECODE (LAMBDA_EXPR, "lambda_expr", tcc_exceptional, 0) |

473 | |

474 | /* The declared type of an expression. This is a C++0x extension. |

475 | DECLTYPE_TYPE_EXPR is the expression whose type we are computing. |

476 | DECLTYPE_TYPE_ID_EXPR_OR_MEMBER_ACCESS_P states whether the |

477 | expression was parsed as an id-expression or a member access |

478 | expression. When false, it was parsed as a full expression. |

479 | DECLTYPE_FOR_LAMBDA_CAPTURE is set if we want lambda capture semantics. |

480 | DECLTYPE_FOR_LAMBDA_RETURN is set if we want lambda return deduction. */ |

481 | DEFTREECODE (DECLTYPE_TYPE, "decltype_type", tcc_type, 0) |

482 | |

483 | /* A type designated by `__underlying_type (type)'. |

484 | UNDERLYING_TYPE_TYPE is the type in question. */ |

485 | DEFTREECODE (UNDERLYING_TYPE, "underlying_type", tcc_type, 0) |

486 | |

487 | /* A type designated by one of the bases type traits. |

488 | BASES_TYPE is the type in question. */ |

489 | DEFTREECODE (BASES, "bases", tcc_type, 0) |

490 | |

491 | /* Used to represent the template information stored by template |

492 | specializations. |

493 | The accessors are: |

494 | TI_TEMPLATE the template declaration associated to the specialization |

495 | TI_ARGS the arguments of the template specialization |

496 | TI_TYPEDEFS_NEEDING_ACCESS_CHECKING the vector of typedefs used in |

497 | the pattern of the template for which access check is needed at template |

498 | instantiation time. */ |

499 | DEFTREECODE (TEMPLATE_INFO, "template_info", tcc_exceptional, 0) |

500 | |

501 | /* Extensions for Concepts. */ |

502 | |

503 | /* Used to represent information associated with constrained declarations. */ |

504 | DEFTREECODE (CONSTRAINT_INFO, "constraint_info", tcc_exceptional, 0) |

505 | |

506 | /* A wildcard declaration is a placeholder for a template parameter |

507 | used to resolve constrained-type-names in concepts. During |

508 | resolution, the matching argument is saved as the TREE_TYPE |

509 | of the wildcard. */ |

510 | DEFTREECODE (WILDCARD_DECL, "wildcard_decl", tcc_declaration, 0) |

511 | |

512 | /* A requires-expr is a binary expression. The first operand is |

513 | its parameter list (possibly NULL). The second is a list of |

514 | requirements, which are denoted by the _REQ* tree codes |

515 | below. */ |

516 | DEFTREECODE (REQUIRES_EXPR, "requires_expr", tcc_expression, 2) |

517 | |

518 | /* A requirement for an expression. */ |

519 | DEFTREECODE (SIMPLE_REQ, "simple_req", tcc_expression, 1) |

520 | |

521 | /* A requirement for a type. */ |

522 | DEFTREECODE (TYPE_REQ, "type_req", tcc_expression, 1) |

523 | |

524 | /* A requirement for an expression and its properties. The |

525 | first operand is the expression, and the 2nd is its type. |

526 | The accessor COMPOUND_REQ_NOEXCEPT determines whether |

527 | the noexcept keyword was present. */ |

528 | DEFTREECODE (COMPOUND_REQ, "compound_req", tcc_expression, 2) |

529 | |

530 | /* A requires clause within a requires expression. */ |

531 | DEFTREECODE (NESTED_REQ, "nested_req", tcc_expression, 1) |

532 | |

533 | /* Constraints are modeled as kinds of expressions. |

534 | The operands of a constraint can be either types or expressions. |

535 | Unlike expressions, constraints do not have a type. */ |

536 | |

537 | /* A predicate constraint evaluates an expression E. |

538 | |

539 | PRED_CONSTR_EXPR has the expression to be evaluated. */ |

540 | DEFTREECODE (PRED_CONSTR, "pred_constr", tcc_expression, 1) |

541 | |

542 | /* A check constraint represents the checking of a concept |

543 | C. It has two operands: the template defining the concept |

544 | and a sequence of template arguments. |

545 | |

546 | CHECK_CONSTR_CONCEPT has the concept definition |

547 | CHECK_CONSTR_ARGUMENTS are the template arguments */ |

548 | DEFTREECODE (CHECK_CONSTR, "check_constr", tcc_expression, 2) |

549 | |

550 | /* An expression constraint determines the validity of a expression E. |

551 | |

552 | EXPR_CONST_EXPR has the expression being validated. */ |

553 | DEFTREECODE (EXPR_CONSTR, "expr_constr", tcc_expression, 1) |

554 | |

555 | /* A type constraint determines the validity of a type T. Note that |

556 | |

557 | TYPE_CONST_TYPE has the type being validated */ |

558 | DEFTREECODE (TYPE_CONSTR, "type_constr", tcc_expression, 1) |

559 | |

560 | /* An implicit conversion constraint determines if an expression |

561 | E is implicitly convertible to a type T. Note that T may |

562 | be dependent but does not contain any placeholders. |

563 | |

564 | ICONV_CONSTR_EXPR has the expression E. |

565 | ICONV_CONSTR_TYPE has the type T. |

566 | */ |

567 | DEFTREECODE (ICONV_CONSTR, "iconv_constr", tcc_expression, 2) |

568 | |

569 | /* An argument deduction constraint determines if the type of an |

570 | expression E can be deduced from a type pattern T. Note that |

571 | T must contain at least one place holder. |

572 | |

573 | DEDUCT_CONSTR_EXPR has the expression E |

574 | DEDUCT_CONSTR_PATTERN has the type pattern T. |

575 | DEDUCT_CONSTR_PLACEHOLDERS has the list of placeholder nodes in T. */ |

576 | DEFTREECODE (DEDUCT_CONSTR, "deduct_constr", tcc_expression, 3) |

577 | |

578 | /* An exception constraint determines if, for an expression E, |

579 | noexcept(E) is true. |

580 | |

581 | EXCEPT_CONSTR_EXPR has the expression E. */ |

582 | DEFTREECODE (EXCEPT_CONSTR, "except_constr", tcc_expression, 1) |

583 | |

584 | /* A parameterized constraint declares constraint variables, which |

585 | are used in expression, type, and exception constraints. |

586 | |

587 | PARM_CONSTR_PARMS has a TREE_LIST of parameter declarations. |

588 | PARM_CONSTR_OPERAND has the nested constraint. */ |

589 | DEFTREECODE (PARM_CONSTR, "parm_constr", tcc_expression, 2) |

590 | |

591 | /* The conjunction and disjunction of two constraints, respectively. |

592 | Operands are accessed using TREE_OPERAND. */ |

593 | DEFTREECODE (CONJ_CONSTR, "conj_constr", tcc_expression, 2) |

594 | DEFTREECODE (DISJ_CONSTR, "disj_constr", tcc_expression, 2) |

595 | |

596 | |

597 | /* |

598 | Local variables: |

599 | mode:c |

600 | End: |

601 | */ |

602 |