1 /* Name mangling for the 3.0 -*- C++ -*- ABI. 2 Copyright (C) 2000-2018 Free Software Foundation, Inc. 3 Written by Alex Samuel <samuel@codesourcery.com> 4 5 This file is part of GCC. 6 7 GCC is free software; you can redistribute it and/or modify it 8 under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3, or (at your option) 10 any later version. 11 12 GCC is distributed in the hope that it will be useful, but 13 WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with GCC; see the file COPYING3. If not see 19 <http://www.gnu.org/licenses/>. */ 20 21 /* This file implements mangling of C++ names according to the IA64 22 C++ ABI specification. A mangled name encodes a function or 23 variable's name, scope, type, and/or template arguments into a text 24 identifier. This identifier is used as the function's or 25 variable's linkage name, to preserve compatibility between C++'s 26 language features (templates, scoping, and overloading) and C 27 linkers. 28 29 Additionally, g++ uses mangled names internally. To support this, 30 mangling of types is allowed, even though the mangled name of a 31 type should not appear by itself as an exported name. Ditto for 32 uninstantiated templates. 33 34 The primary entry point for this module is mangle_decl, which 35 returns an identifier containing the mangled name for a decl. 36 Additional entry points are provided to build mangled names of 37 particular constructs when the appropriate decl for that construct 38 is not available. These are: 39 40 mangle_typeinfo_for_type: typeinfo data 41 mangle_typeinfo_string_for_type: typeinfo type name 42 mangle_vtbl_for_type: virtual table data 43 mangle_vtt_for_type: VTT data 44 mangle_ctor_vtbl_for_type: `C-in-B' constructor virtual table data 45 mangle_thunk: thunk function or entry */ 46 47 #include "config.h" 48 #include "system.h" 49 #include "coretypes.h" 50 #include "target.h" 51 #include "vtable-verify.h" 52 #include "cp-tree.h" 53 #include "stringpool.h" 54 #include "cgraph.h" 55 #include "stor-layout.h" 56 #include "flags.h" 57 #include "attribs.h" 58 59 /* Debugging support. */ 60 61 /* Define DEBUG_MANGLE to enable very verbose trace messages. */ 62 #ifndef DEBUG_MANGLE 63 #define DEBUG_MANGLE 0 64 #endif 65 66 /* Macros for tracing the write_* functions. */ 67 #if DEBUG_MANGLE 68 # define MANGLE_TRACE(FN, INPUT) \ 69 fprintf (stderr, " %-24s: %-24s\n", (FN), (INPUT)) 70 # define MANGLE_TRACE_TREE(FN, NODE) \ 71 fprintf (stderr, " %-24s: %-24s (%p)\n", \ 72 (FN), get_tree_code_name (TREE_CODE (NODE)), (void *) (NODE)) 73 #else 74 # define MANGLE_TRACE(FN, INPUT) 75 # define MANGLE_TRACE_TREE(FN, NODE) 76 #endif 77 78 /* Nonzero if NODE is a class template-id. We can't rely on 79 CLASSTYPE_USE_TEMPLATE here because of tricky bugs in the parser 80 that hard to distinguish A<T> from A, where A<T> is the type as 81 instantiated outside of the template, and A is the type used 82 without parameters inside the template. */ 83 #define CLASSTYPE_TEMPLATE_ID_P(NODE) \ 84 (TREE_CODE (NODE) == BOUND_TEMPLATE_TEMPLATE_PARM \ 85 || (CLASS_TYPE_P (NODE) \ 86 && CLASSTYPE_TEMPLATE_INFO (NODE) != NULL \ 87 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (NODE)))) 88 89 /* For deciding whether to set G.need_abi_warning, we need to consider both 90 warn_abi_version and flag_abi_compat_version. */ 91 #define abi_warn_or_compat_version_crosses(N) \ 92 (abi_version_crosses (N) || abi_compat_version_crosses (N)) 93 94 /* And sometimes we can simplify the code path if we don't need to worry about 95 previous ABIs. */ 96 #define abi_flag_at_least(flag,N) (flag == 0 || flag >= N) 97 #define any_abi_below(N) \ 98 (!abi_version_at_least (N) \ 99 || !abi_flag_at_least (warn_abi_version, (N)) \ 100 || !abi_flag_at_least (flag_abi_compat_version, (N))) 101 102 /* Things we only need one of. This module is not reentrant. */ 103 struct GTY(()) globals { 104 /* An array of the current substitution candidates, in the order 105 we've seen them. */ 106 vec<tree, va_gc> *substitutions; 107 108 /* The entity that is being mangled. */ 109 tree GTY ((skip)) entity; 110 111 /* How many parameter scopes we are inside. */ 112 int parm_depth; 113 114 /* True if the mangling will be different in a future version of the 115 ABI. */ 116 bool need_abi_warning; 117 118 /* True if the mangling will be different in C++17 mode. */ 119 bool need_cxx17_warning; 120 }; 121 122 static GTY (()) globals G; 123 124 /* The obstack on which we build mangled names. */ 125 static struct obstack *mangle_obstack; 126 127 /* The obstack on which we build mangled names that are not going to 128 be IDENTIFIER_NODEs. */ 129 static struct obstack name_obstack; 130 131 /* The first object on the name_obstack; we use this to free memory 132 allocated on the name_obstack. */ 133 static void *name_base; 134 135 /* Indices into subst_identifiers. These are identifiers used in 136 special substitution rules. */ 137 typedef enum 138 { 139 SUBID_ALLOCATOR, 140 SUBID_BASIC_STRING, 141 SUBID_CHAR_TRAITS, 142 SUBID_BASIC_ISTREAM, 143 SUBID_BASIC_OSTREAM, 144 SUBID_BASIC_IOSTREAM, 145 SUBID_MAX 146 } 147 substitution_identifier_index_t; 148 149 /* For quick substitution checks, look up these common identifiers 150 once only. */ 151 static GTY(()) tree subst_identifiers[SUBID_MAX]; 152 153 /* Single-letter codes for builtin integer types, defined in 154 <builtin-type>. These are indexed by integer_type_kind values. */ 155 static const char 156 integer_type_codes[itk_none] = 157 { 158 'c', /* itk_char */ 159 'a', /* itk_signed_char */ 160 'h', /* itk_unsigned_char */ 161 's', /* itk_short */ 162 't', /* itk_unsigned_short */ 163 'i', /* itk_int */ 164 'j', /* itk_unsigned_int */ 165 'l', /* itk_long */ 166 'm', /* itk_unsigned_long */ 167 'x', /* itk_long_long */ 168 'y', /* itk_unsigned_long_long */ 169 /* __intN types are handled separately */ 170 '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0' 171 }; 172 173 static int decl_is_template_id (const tree, tree* const); 174 175 /* Functions for handling substitutions. */ 176 177 static inline tree canonicalize_for_substitution (tree); 178 static void add_substitution (tree); 179 static inline int is_std_substitution (const tree, 180 const substitution_identifier_index_t); 181 static inline int is_std_substitution_char (const tree, 182 const substitution_identifier_index_t); 183 static int find_substitution (tree); 184 static void mangle_call_offset (const tree, const tree); 185 186 /* Functions for emitting mangled representations of things. */ 187 188 static void write_mangled_name (const tree, bool); 189 static void write_encoding (const tree); 190 static void write_name (tree, const int); 191 static void write_abi_tags (tree); 192 static void write_unscoped_name (const tree); 193 static void write_unscoped_template_name (const tree); 194 static void write_nested_name (const tree); 195 static void write_prefix (const tree); 196 static void write_template_prefix (const tree); 197 static void write_unqualified_name (tree); 198 static void write_conversion_operator_name (const tree); 199 static void write_source_name (tree); 200 static void write_literal_operator_name (tree); 201 static void write_unnamed_type_name (const tree); 202 static void write_closure_type_name (const tree); 203 static int hwint_to_ascii (unsigned HOST_WIDE_INT, const unsigned int, char *, 204 const unsigned int); 205 static void write_number (unsigned HOST_WIDE_INT, const int, 206 const unsigned int); 207 static void write_compact_number (int num); 208 static void write_integer_cst (const tree); 209 static void write_real_cst (const tree); 210 static void write_identifier (const char *); 211 static void write_special_name_constructor (const tree); 212 static void write_special_name_destructor (const tree); 213 static void write_type (tree); 214 static int write_CV_qualifiers_for_type (const tree); 215 static void write_builtin_type (tree); 216 static void write_function_type (const tree); 217 static void write_bare_function_type (const tree, const int, const tree); 218 static void write_method_parms (tree, const int, const tree); 219 static void write_class_enum_type (const tree); 220 static void write_template_args (tree); 221 static void write_expression (tree); 222 static void write_template_arg_literal (const tree); 223 static void write_template_arg (tree); 224 static void write_template_template_arg (const tree); 225 static void write_array_type (const tree); 226 static void write_pointer_to_member_type (const tree); 227 static void write_template_param (const tree); 228 static void write_template_template_param (const tree); 229 static void write_substitution (const int); 230 static int discriminator_for_local_entity (tree); 231 static int discriminator_for_string_literal (tree, tree); 232 static void write_discriminator (const int); 233 static void write_local_name (tree, const tree, const tree); 234 static void dump_substitution_candidates (void); 235 static tree mangle_decl_string (const tree); 236 static int local_class_index (tree); 237 static void maybe_check_abi_tags (tree, tree = NULL_TREE, int = 10); 238 static bool equal_abi_tags (tree, tree); 239 240 /* Control functions. */ 241 242 static inline void start_mangling (const tree); 243 static tree mangle_special_for_type (const tree, const char *); 244 245 /* Append a single character to the end of the mangled 246 representation. */ 247 #define write_char(CHAR) \ 248 obstack_1grow (mangle_obstack, (CHAR)) 249 250 /* Append a sized buffer to the end of the mangled representation. */ 251 #define write_chars(CHAR, LEN) \ 252 obstack_grow (mangle_obstack, (CHAR), (LEN)) 253 254 /* Append a NUL-terminated string to the end of the mangled 255 representation. */ 256 #define write_string(STRING) \ 257 obstack_grow (mangle_obstack, (STRING), strlen (STRING)) 258 259 /* Nonzero if NODE1 and NODE2 are both TREE_LIST nodes and have the 260 same purpose (context, which may be a type) and value (template 261 decl). See write_template_prefix for more information on what this 262 is used for. */ 263 #define NESTED_TEMPLATE_MATCH(NODE1, NODE2) \ 264 (TREE_CODE (NODE1) == TREE_LIST \ 265 && TREE_CODE (NODE2) == TREE_LIST \ 266 && ((TYPE_P (TREE_PURPOSE (NODE1)) \ 267 && same_type_p (TREE_PURPOSE (NODE1), TREE_PURPOSE (NODE2))) \ 268 || TREE_PURPOSE (NODE1) == TREE_PURPOSE (NODE2)) \ 269 && TREE_VALUE (NODE1) == TREE_VALUE (NODE2)) 270 271 /* Write out an unsigned quantity in base 10. */ 272 #define write_unsigned_number(NUMBER) \ 273 write_number ((NUMBER), /*unsigned_p=*/1, 10) 274 275 /* If DECL is a template instance (including the uninstantiated template 276 itself), return nonzero and, if TEMPLATE_INFO is non-NULL, set 277 *TEMPLATE_INFO to its template info. Otherwise return zero. */ 278 279 static int 280 decl_is_template_id (const tree decl, tree* const template_info) 281 { 282 if (TREE_CODE (decl) == TYPE_DECL) 283 { 284 /* TYPE_DECLs are handled specially. Look at its type to decide 285 if this is a template instantiation. */ 286 const tree type = TREE_TYPE (decl); 287 288 if (CLASS_TYPE_P (type) && CLASSTYPE_TEMPLATE_ID_P (type)) 289 { 290 if (template_info != NULL) 291 /* For a templated TYPE_DECL, the template info is hanging 292 off the type. */ 293 *template_info = TYPE_TEMPLATE_INFO (type); 294 return 1; 295 } 296 } 297 else 298 { 299 /* Check if this is a primary template. */ 300 if (DECL_LANG_SPECIFIC (decl) != NULL 301 && VAR_OR_FUNCTION_DECL_P (decl) 302 && DECL_TEMPLATE_INFO (decl) 303 && PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl)) 304 && TREE_CODE (decl) != TEMPLATE_DECL) 305 { 306 if (template_info != NULL) 307 /* For most templated decls, the template info is hanging 308 off the decl. */ 309 *template_info = DECL_TEMPLATE_INFO (decl); 310 return 1; 311 } 312 } 313 314 /* It's not a template id. */ 315 return 0; 316 } 317 318 /* Produce debugging output of current substitution candidates. */ 319 320 static void 321 dump_substitution_candidates (void) 322 { 323 unsigned i; 324 tree el; 325 326 fprintf (stderr, " ++ substitutions "); 327 FOR_EACH_VEC_ELT (*G.substitutions, i, el) 328 { 329 const char *name = "???"; 330 331 if (i > 0) 332 fprintf (stderr, " "); 333 if (DECL_P (el)) 334 name = IDENTIFIER_POINTER (DECL_NAME (el)); 335 else if (TREE_CODE (el) == TREE_LIST) 336 name = IDENTIFIER_POINTER (DECL_NAME (TREE_VALUE (el))); 337 else if (TYPE_NAME (el)) 338 name = TYPE_NAME_STRING (el); 339 fprintf (stderr, " S%d_ = ", i - 1); 340 if (TYPE_P (el) && 341 (CP_TYPE_RESTRICT_P (el) 342 || CP_TYPE_VOLATILE_P (el) 343 || CP_TYPE_CONST_P (el))) 344 fprintf (stderr, "CV-"); 345 fprintf (stderr, "%s (%s at %p)\n", 346 name, get_tree_code_name (TREE_CODE (el)), (void *) el); 347 } 348 } 349 350 /* <exception-spec> ::= 351 Do -- non-throwing exception specification 352 DO <expression> E -- computed (instantiation-dependent) noexcept 353 Dw <type>* E -- throw (types) */ 354 355 static void 356 write_exception_spec (tree spec) 357 { 358 359 if (!spec || spec == noexcept_false_spec) 360 /* Nothing. */ 361 return; 362 363 if (!flag_noexcept_type) 364 { 365 G.need_cxx17_warning = true; 366 return; 367 } 368 369 if (spec == noexcept_true_spec || spec == empty_except_spec) 370 write_string ("Do"); 371 else if (tree expr = TREE_PURPOSE (spec)) 372 { 373 /* noexcept (expr) */ 374 gcc_assert (uses_template_parms (expr)); 375 write_string ("DO"); 376 write_expression (expr); 377 write_char ('E'); 378 } 379 else 380 { 381 /* throw (type-list) */ 382 write_string ("Dw"); 383 for (tree t = spec; t; t = TREE_CHAIN (t)) 384 write_type (TREE_VALUE (t)); 385 write_char ('E'); 386 } 387 } 388 389 /* Both decls and types can be substitution candidates, but sometimes 390 they refer to the same thing. For instance, a TYPE_DECL and 391 RECORD_TYPE for the same class refer to the same thing, and should 392 be treated accordingly in substitutions. This function returns a 393 canonicalized tree node representing NODE that is used when adding 394 and substitution candidates and finding matches. */ 395 396 static inline tree 397 canonicalize_for_substitution (tree node) 398 { 399 /* For a TYPE_DECL, use the type instead. */ 400 if (TREE_CODE (node) == TYPE_DECL) 401 node = TREE_TYPE (node); 402 if (TYPE_P (node) 403 && TYPE_CANONICAL (node) != node 404 && TYPE_MAIN_VARIANT (node) != node) 405 { 406 tree orig = node; 407 /* Here we want to strip the topmost typedef only. 408 We need to do that so is_std_substitution can do proper 409 name matching. */ 410 if (TREE_CODE (node) == FUNCTION_TYPE) 411 /* Use build_qualified_type and TYPE_QUALS here to preserve 412 the old buggy mangling of attribute noreturn with abi<5. */ 413 node = build_qualified_type (TYPE_MAIN_VARIANT (node), 414 TYPE_QUALS (node)); 415 else 416 node = cp_build_qualified_type (TYPE_MAIN_VARIANT (node), 417 cp_type_quals (node)); 418 if (TREE_CODE (node) == FUNCTION_TYPE 419 || TREE_CODE (node) == METHOD_TYPE) 420 { 421 node = build_ref_qualified_type (node, type_memfn_rqual (orig)); 422 tree r = canonical_eh_spec (TYPE_RAISES_EXCEPTIONS (orig)); 423 if (flag_noexcept_type) 424 node = build_exception_variant (node, r); 425 else 426 /* Set the warning flag if appropriate. */ 427 write_exception_spec (r); 428 } 429 } 430 return node; 431 } 432 433 /* Add NODE as a substitution candidate. NODE must not already be on 434 the list of candidates. */ 435 436 static void 437 add_substitution (tree node) 438 { 439 tree c; 440 441 if (DEBUG_MANGLE) 442 fprintf (stderr, " ++ add_substitution (%s at %10p)\n", 443 get_tree_code_name (TREE_CODE (node)), (void *) node); 444 445 /* Get the canonicalized substitution candidate for NODE. */ 446 c = canonicalize_for_substitution (node); 447 if (DEBUG_MANGLE && c != node) 448 fprintf (stderr, " ++ using candidate (%s at %10p)\n", 449 get_tree_code_name (TREE_CODE (node)), (void *) node); 450 node = c; 451 452 /* Make sure NODE isn't already a candidate. */ 453 if (flag_checking) 454 { 455 int i; 456 tree candidate; 457 458 FOR_EACH_VEC_SAFE_ELT (G.substitutions, i, candidate) 459 { 460 gcc_assert (!(DECL_P (node) && node == candidate)); 461 gcc_assert (!(TYPE_P (node) && TYPE_P (candidate) 462 && same_type_p (node, candidate))); 463 } 464 } 465 466 /* Put the decl onto the varray of substitution candidates. */ 467 vec_safe_push (G.substitutions, node); 468 469 if (DEBUG_MANGLE) 470 dump_substitution_candidates (); 471 } 472 473 /* Helper function for find_substitution. Returns nonzero if NODE, 474 which may be a decl or a CLASS_TYPE, is a template-id with template 475 name of substitution_index[INDEX] in the ::std namespace. */ 476 477 static inline int 478 is_std_substitution (const tree node, 479 const substitution_identifier_index_t index) 480 { 481 tree type = NULL; 482 tree decl = NULL; 483 484 if (DECL_P (node)) 485 { 486 type = TREE_TYPE (node); 487 decl = node; 488 } 489 else if (CLASS_TYPE_P (node)) 490 { 491 type = node; 492 decl = TYPE_NAME (node); 493 } 494 else 495 /* These are not the droids you're looking for. */ 496 return 0; 497 498 return (DECL_NAMESPACE_STD_P (CP_DECL_CONTEXT (decl)) 499 && TYPE_LANG_SPECIFIC (type) 500 && TYPE_TEMPLATE_INFO (type) 501 && (DECL_NAME (TYPE_TI_TEMPLATE (type)) 502 == subst_identifiers[index])); 503 } 504 505 /* Return the ABI tags (the TREE_VALUE of the "abi_tag" attribute entry) for T, 506 which can be a decl or type. */ 507 508 static tree 509 get_abi_tags (tree t) 510 { 511 if (!t || TREE_CODE (t) == NAMESPACE_DECL) 512 return NULL_TREE; 513 514 if (DECL_P (t) && DECL_DECLARES_TYPE_P (t)) 515 t = TREE_TYPE (t); 516 517 tree attrs; 518 if (TYPE_P (t)) 519 attrs = TYPE_ATTRIBUTES (t); 520 else 521 attrs = DECL_ATTRIBUTES (t); 522 523 tree tags = lookup_attribute ("abi_tag", attrs); 524 if (tags) 525 tags = TREE_VALUE (tags); 526 return tags; 527 } 528 529 /* Helper function for find_substitution. Returns nonzero if NODE, 530 which may be a decl or a CLASS_TYPE, is the template-id 531 ::std::identifier<char>, where identifier is 532 substitution_index[INDEX]. */ 533 534 static inline int 535 is_std_substitution_char (const tree node, 536 const substitution_identifier_index_t index) 537 { 538 tree args; 539 /* Check NODE's name is ::std::identifier. */ 540 if (!is_std_substitution (node, index)) 541 return 0; 542 /* Figure out its template args. */ 543 if (DECL_P (node)) 544 args = DECL_TI_ARGS (node); 545 else if (CLASS_TYPE_P (node)) 546 args = CLASSTYPE_TI_ARGS (node); 547 else 548 /* Oops, not a template. */ 549 return 0; 550 /* NODE's template arg list should be <char>. */ 551 return 552 TREE_VEC_LENGTH (args) == 1 553 && TREE_VEC_ELT (args, 0) == char_type_node; 554 } 555 556 /* Check whether a substitution should be used to represent NODE in 557 the mangling. 558 559 First, check standard special-case substitutions. 560 561 <substitution> ::= St 562 # ::std 563 564 ::= Sa 565 # ::std::allocator 566 567 ::= Sb 568 # ::std::basic_string 569 570 ::= Ss 571 # ::std::basic_string<char, 572 ::std::char_traits<char>, 573 ::std::allocator<char> > 574 575 ::= Si 576 # ::std::basic_istream<char, ::std::char_traits<char> > 577 578 ::= So 579 # ::std::basic_ostream<char, ::std::char_traits<char> > 580 581 ::= Sd 582 # ::std::basic_iostream<char, ::std::char_traits<char> > 583 584 Then examine the stack of currently available substitution 585 candidates for entities appearing earlier in the same mangling 586 587 If a substitution is found, write its mangled representation and 588 return nonzero. If none is found, just return zero. */ 589 590 static int 591 find_substitution (tree node) 592 { 593 int i; 594 const int size = vec_safe_length (G.substitutions); 595 tree decl; 596 tree type; 597 const char *abbr = NULL; 598 599 if (DEBUG_MANGLE) 600 fprintf (stderr, " ++ find_substitution (%s at %p)\n", 601 get_tree_code_name (TREE_CODE (node)), (void *) node); 602 603 /* Obtain the canonicalized substitution representation for NODE. 604 This is what we'll compare against. */ 605 node = canonicalize_for_substitution (node); 606 607 /* Check for builtin substitutions. */ 608 609 decl = TYPE_P (node) ? TYPE_NAME (node) : node; 610 type = TYPE_P (node) ? node : TREE_TYPE (node); 611 612 /* Check for std::allocator. */ 613 if (decl 614 && is_std_substitution (decl, SUBID_ALLOCATOR) 615 && !CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl))) 616 abbr = "Sa"; 617 618 /* Check for std::basic_string. */ 619 else if (decl && is_std_substitution (decl, SUBID_BASIC_STRING)) 620 { 621 if (TYPE_P (node)) 622 { 623 /* If this is a type (i.e. a fully-qualified template-id), 624 check for 625 std::basic_string <char, 626 std::char_traits<char>, 627 std::allocator<char> > . */ 628 if (cp_type_quals (type) == TYPE_UNQUALIFIED 629 && CLASSTYPE_USE_TEMPLATE (type)) 630 { 631 tree args = CLASSTYPE_TI_ARGS (type); 632 if (TREE_VEC_LENGTH (args) == 3 633 && same_type_p (TREE_VEC_ELT (args, 0), char_type_node) 634 && is_std_substitution_char (TREE_VEC_ELT (args, 1), 635 SUBID_CHAR_TRAITS) 636 && is_std_substitution_char (TREE_VEC_ELT (args, 2), 637 SUBID_ALLOCATOR)) 638 abbr = "Ss"; 639 } 640 } 641 else 642 /* Substitute for the template name only if this isn't a type. */ 643 abbr = "Sb"; 644 } 645 646 /* Check for basic_{i,o,io}stream. */ 647 else if (TYPE_P (node) 648 && cp_type_quals (type) == TYPE_UNQUALIFIED 649 && CLASS_TYPE_P (type) 650 && CLASSTYPE_USE_TEMPLATE (type) 651 && CLASSTYPE_TEMPLATE_INFO (type) != NULL) 652 { 653 /* First, check for the template 654 args <char, std::char_traits<char> > . */ 655 tree args = CLASSTYPE_TI_ARGS (type); 656 if (TREE_VEC_LENGTH (args) == 2 657 && TYPE_P (TREE_VEC_ELT (args, 0)) 658 && same_type_p (TREE_VEC_ELT (args, 0), char_type_node) 659 && is_std_substitution_char (TREE_VEC_ELT (args, 1), 660 SUBID_CHAR_TRAITS)) 661 { 662 /* Got them. Is this basic_istream? */ 663 if (is_std_substitution (decl, SUBID_BASIC_ISTREAM)) 664 abbr = "Si"; 665 /* Or basic_ostream? */ 666 else if (is_std_substitution (decl, SUBID_BASIC_OSTREAM)) 667 abbr = "So"; 668 /* Or basic_iostream? */ 669 else if (is_std_substitution (decl, SUBID_BASIC_IOSTREAM)) 670 abbr = "Sd"; 671 } 672 } 673 674 /* Check for namespace std. */ 675 else if (decl && DECL_NAMESPACE_STD_P (decl)) 676 { 677 write_string ("St"); 678 return 1; 679 } 680 681 tree tags = NULL_TREE; 682 if (OVERLOAD_TYPE_P (node) || DECL_CLASS_TEMPLATE_P (node)) 683 tags = get_abi_tags (type); 684 /* Now check the list of available substitutions for this mangling 685 operation. */ 686 if (!abbr || tags) for (i = 0; i < size; ++i) 687 { 688 tree candidate = (*G.substitutions)[i]; 689 /* NODE is a matched to a candidate if it's the same decl node or 690 if it's the same type. */ 691 if (decl == candidate 692 || (TYPE_P (candidate) && type && TYPE_P (node) 693 && same_type_p (type, candidate)) 694 || NESTED_TEMPLATE_MATCH (node, candidate)) 695 { 696 write_substitution (i); 697 return 1; 698 } 699 } 700 701 if (!abbr) 702 /* No substitution found. */ 703 return 0; 704 705 write_string (abbr); 706 if (tags) 707 { 708 /* If there are ABI tags on the abbreviation, it becomes 709 a substitution candidate. */ 710 write_abi_tags (tags); 711 add_substitution (node); 712 } 713 return 1; 714 } 715 716 /* Returns whether DECL's symbol name should be the plain unqualified-id 717 rather than a more complicated mangled name. */ 718 719 static bool 720 unmangled_name_p (const tree decl) 721 { 722 if (TREE_CODE (decl) == FUNCTION_DECL) 723 { 724 /* The names of `extern "C"' functions are not mangled. */ 725 return (DECL_EXTERN_C_FUNCTION_P (decl) 726 /* But overloaded operator names *are* mangled. */ 727 && !DECL_OVERLOADED_OPERATOR_P (decl)); 728 } 729 else if (VAR_P (decl)) 730 { 731 /* static variables are mangled. */ 732 if (!DECL_EXTERNAL_LINKAGE_P (decl)) 733 return false; 734 735 /* extern "C" declarations aren't mangled. */ 736 if (DECL_EXTERN_C_P (decl)) 737 return true; 738 739 /* Other variables at non-global scope are mangled. */ 740 if (CP_DECL_CONTEXT (decl) != global_namespace) 741 return false; 742 743 /* Variable template instantiations are mangled. */ 744 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl) 745 && variable_template_p (DECL_TI_TEMPLATE (decl))) 746 return false; 747 748 /* Declarations with ABI tags are mangled. */ 749 if (get_abi_tags (decl)) 750 return false; 751 752 /* The names of non-static global variables aren't mangled. */ 753 return true; 754 } 755 756 return false; 757 } 758 759 /* TOP_LEVEL is true, if this is being called at outermost level of 760 mangling. It should be false when mangling a decl appearing in an 761 expression within some other mangling. 762 763 <mangled-name> ::= _Z <encoding> */ 764 765 static void 766 write_mangled_name (const tree decl, bool top_level) 767 { 768 MANGLE_TRACE_TREE ("mangled-name", decl); 769 770 check_abi_tags (decl); 771 772 if (unmangled_name_p (decl)) 773 { 774 if (top_level) 775 write_string (IDENTIFIER_POINTER (DECL_NAME (decl))); 776 else 777 { 778 /* The standard notes: "The <encoding> of an extern "C" 779 function is treated like global-scope data, i.e. as its 780 <source-name> without a type." We cannot write 781 overloaded operators that way though, because it contains 782 characters invalid in assembler. */ 783 write_string ("_Z"); 784 write_source_name (DECL_NAME (decl)); 785 } 786 } 787 else 788 { 789 write_string ("_Z"); 790 write_encoding (decl); 791 } 792 } 793 794 /* Returns true if the return type of DECL is part of its signature, and 795 therefore its mangling. */ 796 797 bool 798 mangle_return_type_p (tree decl) 799 { 800 return (!DECL_CONSTRUCTOR_P (decl) 801 && !DECL_DESTRUCTOR_P (decl) 802 && !DECL_CONV_FN_P (decl) 803 && decl_is_template_id (decl, NULL)); 804 } 805 806 /* <encoding> ::= <function name> <bare-function-type> 807 ::= <data name> */ 808 809 static void 810 write_encoding (const tree decl) 811 { 812 MANGLE_TRACE_TREE ("encoding", decl); 813 814 if (DECL_LANG_SPECIFIC (decl) && DECL_EXTERN_C_FUNCTION_P (decl)) 815 { 816 /* For overloaded operators write just the mangled name 817 without arguments. */ 818 if (DECL_OVERLOADED_OPERATOR_P (decl)) 819 write_name (decl, /*ignore_local_scope=*/0); 820 else 821 write_source_name (DECL_NAME (decl)); 822 return; 823 } 824 825 write_name (decl, /*ignore_local_scope=*/0); 826 if (TREE_CODE (decl) == FUNCTION_DECL) 827 { 828 tree fn_type; 829 tree d; 830 bool tmpl = decl_is_template_id (decl, NULL); 831 832 if (tmpl) 833 { 834 fn_type = get_mostly_instantiated_function_type (decl); 835 /* FN_TYPE will not have parameter types for in-charge or 836 VTT parameters. Therefore, we pass NULL_TREE to 837 write_bare_function_type -- otherwise, it will get 838 confused about which artificial parameters to skip. */ 839 d = NULL_TREE; 840 } 841 else 842 { 843 fn_type = TREE_TYPE (decl); 844 d = decl; 845 } 846 847 write_bare_function_type (fn_type, 848 mangle_return_type_p (decl), 849 d); 850 } 851 } 852 853 /* Lambdas can have a bit more context for mangling, specifically VAR_DECL 854 or PARM_DECL context, which doesn't belong in DECL_CONTEXT. */ 855 856 static tree 857 decl_mangling_context (tree decl) 858 { 859 tree tcontext = targetm.cxx.decl_mangling_context (decl); 860 861 if (tcontext != NULL_TREE) 862 return tcontext; 863 864 if (TREE_CODE (decl) == TEMPLATE_DECL 865 && DECL_TEMPLATE_RESULT (decl)) 866 decl = DECL_TEMPLATE_RESULT (decl); 867 868 if (TREE_CODE (decl) == TYPE_DECL 869 && LAMBDA_TYPE_P (TREE_TYPE (decl))) 870 { 871 tree extra = LAMBDA_TYPE_EXTRA_SCOPE (TREE_TYPE (decl)); 872 if (extra) 873 return extra; 874 } 875 else if (template_type_parameter_p (decl)) 876 /* template type parms have no mangling context. */ 877 return NULL_TREE; 878 return CP_DECL_CONTEXT (decl); 879 } 880 881 /* <name> ::= <unscoped-name> 882 ::= <unscoped-template-name> <template-args> 883 ::= <nested-name> 884 ::= <local-name> 885 886 If IGNORE_LOCAL_SCOPE is nonzero, this production of <name> is 887 called from <local-name>, which mangles the enclosing scope 888 elsewhere and then uses this function to mangle just the part 889 underneath the function scope. So don't use the <local-name> 890 production, to avoid an infinite recursion. */ 891 892 static void 893 write_name (tree decl, const int ignore_local_scope) 894 { 895 tree context; 896 897 MANGLE_TRACE_TREE ("name", decl); 898 899 if (TREE_CODE (decl) == TYPE_DECL) 900 { 901 /* In case this is a typedef, fish out the corresponding 902 TYPE_DECL for the main variant. */ 903 decl = TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))); 904 } 905 906 context = decl_mangling_context (decl); 907 908 gcc_assert (context != NULL_TREE); 909 910 if (abi_warn_or_compat_version_crosses (7) 911 && ignore_local_scope 912 && TREE_CODE (context) == PARM_DECL) 913 G.need_abi_warning = 1; 914 915 /* A decl in :: or ::std scope is treated specially. The former is 916 mangled using <unscoped-name> or <unscoped-template-name>, the 917 latter with a special substitution. Also, a name that is 918 directly in a local function scope is also mangled with 919 <unscoped-name> rather than a full <nested-name>. */ 920 if (context == global_namespace 921 || DECL_NAMESPACE_STD_P (context) 922 || (ignore_local_scope 923 && (TREE_CODE (context) == FUNCTION_DECL 924 || (abi_version_at_least (7) 925 && TREE_CODE (context) == PARM_DECL)))) 926 { 927 tree template_info; 928 /* Is this a template instance? */ 929 if (decl_is_template_id (decl, &template_info)) 930 { 931 /* Yes: use <unscoped-template-name>. */ 932 write_unscoped_template_name (TI_TEMPLATE (template_info)); 933 write_template_args (TI_ARGS (template_info)); 934 } 935 else 936 /* Everything else gets an <unqualified-name>. */ 937 write_unscoped_name (decl); 938 } 939 else 940 { 941 /* Handle local names, unless we asked not to (that is, invoked 942 under <local-name>, to handle only the part of the name under 943 the local scope). */ 944 if (!ignore_local_scope) 945 { 946 /* Scan up the list of scope context, looking for a 947 function. If we find one, this entity is in local 948 function scope. local_entity tracks context one scope 949 level down, so it will contain the element that's 950 directly in that function's scope, either decl or one of 951 its enclosing scopes. */ 952 tree local_entity = decl; 953 while (context != global_namespace) 954 { 955 /* Make sure we're always dealing with decls. */ 956 if (TYPE_P (context)) 957 context = TYPE_NAME (context); 958 /* Is this a function? */ 959 if (TREE_CODE (context) == FUNCTION_DECL 960 || TREE_CODE (context) == PARM_DECL) 961 { 962 /* Yes, we have local scope. Use the <local-name> 963 production for the innermost function scope. */ 964 write_local_name (context, local_entity, decl); 965 return; 966 } 967 /* Up one scope level. */ 968 local_entity = context; 969 context = decl_mangling_context (context); 970 } 971 972 /* No local scope found? Fall through to <nested-name>. */ 973 } 974 975 /* Other decls get a <nested-name> to encode their scope. */ 976 write_nested_name (decl); 977 } 978 } 979 980 /* <unscoped-name> ::= <unqualified-name> 981 ::= St <unqualified-name> # ::std:: */ 982 983 static void 984 write_unscoped_name (const tree decl) 985 { 986 tree context = decl_mangling_context (decl); 987 988 MANGLE_TRACE_TREE ("unscoped-name", decl); 989 990 /* Is DECL in ::std? */ 991 if (DECL_NAMESPACE_STD_P (context)) 992 { 993 write_string ("St"); 994 write_unqualified_name (decl); 995 } 996 else 997 { 998 /* If not, it should be either in the global namespace, or directly 999 in a local function scope. A lambda can also be mangled in the 1000 scope of a default argument. */ 1001 gcc_assert (context == global_namespace 1002 || TREE_CODE (context) == PARM_DECL 1003 || TREE_CODE (context) == FUNCTION_DECL); 1004 1005 write_unqualified_name (decl); 1006 } 1007 } 1008 1009 /* <unscoped-template-name> ::= <unscoped-name> 1010 ::= <substitution> */ 1011 1012 static void 1013 write_unscoped_template_name (const tree decl) 1014 { 1015 MANGLE_TRACE_TREE ("unscoped-template-name", decl); 1016 1017 if (find_substitution (decl)) 1018 return; 1019 write_unscoped_name (decl); 1020 add_substitution (decl); 1021 } 1022 1023 /* Write the nested name, including CV-qualifiers, of DECL. 1024 1025 <nested-name> ::= N [<CV-qualifiers>] [<ref-qualifier>] <prefix> <unqualified-name> E 1026 ::= N [<CV-qualifiers>] [<ref-qualifier>] <template-prefix> <template-args> E 1027 1028 <ref-qualifier> ::= R # & ref-qualifier 1029 ::= O # && ref-qualifier 1030 <CV-qualifiers> ::= [r] [V] [K] */ 1031 1032 static void 1033 write_nested_name (const tree decl) 1034 { 1035 tree template_info; 1036 1037 MANGLE_TRACE_TREE ("nested-name", decl); 1038 1039 write_char ('N'); 1040 1041 /* Write CV-qualifiers, if this is a member function. */ 1042 if (TREE_CODE (decl) == FUNCTION_DECL 1043 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)) 1044 { 1045 if (DECL_VOLATILE_MEMFUNC_P (decl)) 1046 write_char ('V'); 1047 if (DECL_CONST_MEMFUNC_P (decl)) 1048 write_char ('K'); 1049 if (FUNCTION_REF_QUALIFIED (TREE_TYPE (decl))) 1050 { 1051 if (FUNCTION_RVALUE_QUALIFIED (TREE_TYPE (decl))) 1052 write_char ('O'); 1053 else 1054 write_char ('R'); 1055 } 1056 } 1057 1058 /* Is this a template instance? */ 1059 if (decl_is_template_id (decl, &template_info)) 1060 { 1061 /* Yes, use <template-prefix>. */ 1062 write_template_prefix (decl); 1063 write_template_args (TI_ARGS (template_info)); 1064 } 1065 else if ((!abi_version_at_least (10) || TREE_CODE (decl) == TYPE_DECL) 1066 && TREE_CODE (TREE_TYPE (decl)) == TYPENAME_TYPE) 1067 { 1068 tree name = TYPENAME_TYPE_FULLNAME (TREE_TYPE (decl)); 1069 if (TREE_CODE (name) == TEMPLATE_ID_EXPR) 1070 { 1071 write_template_prefix (decl); 1072 write_template_args (TREE_OPERAND (name, 1)); 1073 } 1074 else 1075 { 1076 write_prefix (decl_mangling_context (decl)); 1077 write_unqualified_name (decl); 1078 } 1079 } 1080 else 1081 { 1082 /* No, just use <prefix> */ 1083 write_prefix (decl_mangling_context (decl)); 1084 write_unqualified_name (decl); 1085 } 1086 write_char ('E'); 1087 } 1088 1089 /* <prefix> ::= <prefix> <unqualified-name> 1090 ::= <template-param> 1091 ::= <template-prefix> <template-args> 1092 ::= <decltype> 1093 ::= # empty 1094 ::= <substitution> */ 1095 1096 static void 1097 write_prefix (const tree node) 1098 { 1099 tree decl; 1100 /* Non-NULL if NODE represents a template-id. */ 1101 tree template_info = NULL; 1102 1103 if (node == NULL 1104 || node == global_namespace) 1105 return; 1106 1107 MANGLE_TRACE_TREE ("prefix", node); 1108 1109 if (TREE_CODE (node) == DECLTYPE_TYPE) 1110 { 1111 write_type (node); 1112 return; 1113 } 1114 1115 if (find_substitution (node)) 1116 return; 1117 1118 if (DECL_P (node)) 1119 { 1120 /* If this is a function or parm decl, that means we've hit function 1121 scope, so this prefix must be for a local name. In this 1122 case, we're under the <local-name> production, which encodes 1123 the enclosing function scope elsewhere. So don't continue 1124 here. */ 1125 if (TREE_CODE (node) == FUNCTION_DECL 1126 || TREE_CODE (node) == PARM_DECL) 1127 return; 1128 1129 decl = node; 1130 decl_is_template_id (decl, &template_info); 1131 } 1132 else 1133 { 1134 /* Node is a type. */ 1135 decl = TYPE_NAME (node); 1136 if (CLASSTYPE_TEMPLATE_ID_P (node)) 1137 template_info = TYPE_TEMPLATE_INFO (node); 1138 } 1139 1140 if (TREE_CODE (node) == TEMPLATE_TYPE_PARM) 1141 write_template_param (node); 1142 else if (template_info != NULL) 1143 /* Templated. */ 1144 { 1145 write_template_prefix (decl); 1146 write_template_args (TI_ARGS (template_info)); 1147 } 1148 else if (TREE_CODE (TREE_TYPE (decl)) == TYPENAME_TYPE) 1149 { 1150 tree name = TYPENAME_TYPE_FULLNAME (TREE_TYPE (decl)); 1151 if (TREE_CODE (name) == TEMPLATE_ID_EXPR) 1152 { 1153 write_template_prefix (decl); 1154 write_template_args (TREE_OPERAND (name, 1)); 1155 } 1156 else 1157 { 1158 write_prefix (decl_mangling_context (decl)); 1159 write_unqualified_name (decl); 1160 } 1161 } 1162 else 1163 /* Not templated. */ 1164 { 1165 write_prefix (decl_mangling_context (decl)); 1166 write_unqualified_name (decl); 1167 if (VAR_P (decl) 1168 || TREE_CODE (decl) == FIELD_DECL) 1169 { 1170 /* <data-member-prefix> := <member source-name> M */ 1171 write_char ('M'); 1172 return; 1173 } 1174 } 1175 1176 add_substitution (node); 1177 } 1178 1179 /* <template-prefix> ::= <prefix> <template component> 1180 ::= <template-param> 1181 ::= <substitution> */ 1182 1183 static void 1184 write_template_prefix (const tree node) 1185 { 1186 tree decl = DECL_P (node) ? node : TYPE_NAME (node); 1187 tree type = DECL_P (node) ? TREE_TYPE (node) : node; 1188 tree context = decl_mangling_context (decl); 1189 tree template_info; 1190 tree templ; 1191 tree substitution; 1192 1193 MANGLE_TRACE_TREE ("template-prefix", node); 1194 1195 /* Find the template decl. */ 1196 if (decl_is_template_id (decl, &template_info)) 1197 templ = TI_TEMPLATE (template_info); 1198 else if (TREE_CODE (type) == TYPENAME_TYPE) 1199 /* For a typename type, all we have is the name. */ 1200 templ = DECL_NAME (decl); 1201 else 1202 { 1203 gcc_assert (CLASSTYPE_TEMPLATE_ID_P (type)); 1204 1205 templ = TYPE_TI_TEMPLATE (type); 1206 } 1207 1208 /* For a member template, though, the template name for the 1209 innermost name must have all the outer template levels 1210 instantiated. For instance, consider 1211 1212 template<typename T> struct Outer { 1213 template<typename U> struct Inner {}; 1214 }; 1215 1216 The template name for `Inner' in `Outer<int>::Inner<float>' is 1217 `Outer<int>::Inner<U>'. In g++, we don't instantiate the template 1218 levels separately, so there's no TEMPLATE_DECL available for this 1219 (there's only `Outer<T>::Inner<U>'). 1220 1221 In order to get the substitutions right, we create a special 1222 TREE_LIST to represent the substitution candidate for a nested 1223 template. The TREE_PURPOSE is the template's context, fully 1224 instantiated, and the TREE_VALUE is the TEMPLATE_DECL for the inner 1225 template. 1226 1227 So, for the example above, `Outer<int>::Inner' is represented as a 1228 substitution candidate by a TREE_LIST whose purpose is `Outer<int>' 1229 and whose value is `Outer<T>::Inner<U>'. */ 1230 if (context && TYPE_P (context)) 1231 substitution = build_tree_list (context, templ); 1232 else 1233 substitution = templ; 1234 1235 if (find_substitution (substitution)) 1236 return; 1237 1238 if (TREE_TYPE (templ) 1239 && TREE_CODE (TREE_TYPE (templ)) == TEMPLATE_TEMPLATE_PARM) 1240 write_template_param (TREE_TYPE (templ)); 1241 else 1242 { 1243 write_prefix (context); 1244 write_unqualified_name (decl); 1245 } 1246 1247 add_substitution (substitution); 1248 } 1249 1250 /* As the list of identifiers for the structured binding declaration 1251 DECL is likely gone, try to recover the DC <source-name>+ E portion 1252 from its mangled name. Return pointer to the DC and set len to 1253 the length up to and including the terminating E. On failure 1254 return NULL. */ 1255 1256 static const char * 1257 find_decomp_unqualified_name (tree decl, size_t *len) 1258 { 1259 const char *p = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)); 1260 const char *end = p + IDENTIFIER_LENGTH (DECL_ASSEMBLER_NAME (decl)); 1261 bool nested = false; 1262 if (strncmp (p, "_Z", 2)) 1263 return NULL; 1264 p += 2; 1265 if (!strncmp (p, "St", 2)) 1266 p += 2; 1267 else if (*p == 'N') 1268 { 1269 nested = true; 1270 ++p; 1271 while (ISDIGIT (p[0])) 1272 { 1273 char *e; 1274 long num = strtol (p, &e, 10); 1275 if (num >= 1 && num < end - e) 1276 p = e + num; 1277 else 1278 break; 1279 } 1280 } 1281 if (strncmp (p, "DC", 2)) 1282 return NULL; 1283 if (nested) 1284 { 1285 if (end[-1] != 'E') 1286 return NULL; 1287 --end; 1288 } 1289 if (end[-1] != 'E') 1290 return NULL; 1291 *len = end - p; 1292 return p; 1293 } 1294 1295 /* We don't need to handle thunks, vtables, or VTTs here. Those are 1296 mangled through special entry points. 1297 1298 <unqualified-name> ::= <operator-name> 1299 ::= <special-name> 1300 ::= <source-name> 1301 ::= <unnamed-type-name> 1302 ::= <local-source-name> 1303 1304 <local-source-name> ::= L <source-name> <discriminator> */ 1305 1306 static void 1307 write_unqualified_id (tree identifier) 1308 { 1309 if (IDENTIFIER_CONV_OP_P (identifier)) 1310 write_conversion_operator_name (TREE_TYPE (identifier)); 1311 else if (IDENTIFIER_OVL_OP_P (identifier)) 1312 { 1313 const ovl_op_info_t *ovl_op = IDENTIFIER_OVL_OP_INFO (identifier); 1314 write_string (ovl_op->mangled_name); 1315 } 1316 else if (UDLIT_OPER_P (identifier)) 1317 write_literal_operator_name (identifier); 1318 else 1319 write_source_name (identifier); 1320 } 1321 1322 static void 1323 write_unqualified_name (tree decl) 1324 { 1325 MANGLE_TRACE_TREE ("unqualified-name", decl); 1326 1327 if (identifier_p (decl)) 1328 { 1329 write_unqualified_id (decl); 1330 return; 1331 } 1332 1333 bool found = false; 1334 1335 if (DECL_NAME (decl) == NULL_TREE) 1336 { 1337 found = true; 1338 gcc_assert (DECL_ASSEMBLER_NAME_SET_P (decl)); 1339 const char *decomp_str = NULL; 1340 size_t decomp_len = 0; 1341 if (VAR_P (decl) 1342 && DECL_DECOMPOSITION_P (decl) 1343 && DECL_NAME (decl) == NULL_TREE 1344 && DECL_NAMESPACE_SCOPE_P (decl)) 1345 decomp_str = find_decomp_unqualified_name (decl, &decomp_len); 1346 if (decomp_str) 1347 write_chars (decomp_str, decomp_len); 1348 else 1349 write_source_name (DECL_ASSEMBLER_NAME (decl)); 1350 } 1351 else if (DECL_DECLARES_FUNCTION_P (decl)) 1352 { 1353 found = true; 1354 if (DECL_CONSTRUCTOR_P (decl)) 1355 write_special_name_constructor (decl); 1356 else if (DECL_DESTRUCTOR_P (decl)) 1357 write_special_name_destructor (decl); 1358 else if (DECL_CONV_FN_P (decl)) 1359 { 1360 /* Conversion operator. Handle it right here. 1361 <operator> ::= cv <type> */ 1362 tree type; 1363 if (decl_is_template_id (decl, NULL)) 1364 { 1365 tree fn_type; 1366 fn_type = get_mostly_instantiated_function_type (decl); 1367 type = TREE_TYPE (fn_type); 1368 } 1369 else if (FNDECL_USED_AUTO (decl)) 1370 type = (DECL_STRUCT_FUNCTION (decl)->language 1371 ->x_auto_return_pattern); 1372 else 1373 type = DECL_CONV_FN_TYPE (decl); 1374 write_conversion_operator_name (type); 1375 } 1376 else if (DECL_OVERLOADED_OPERATOR_P (decl)) 1377 { 1378 const char *mangled_name 1379 = (ovl_op_info[DECL_ASSIGNMENT_OPERATOR_P (decl)] 1380 [DECL_OVERLOADED_OPERATOR_CODE_RAW (decl)].mangled_name); 1381 write_string (mangled_name); 1382 } 1383 else if (UDLIT_OPER_P (DECL_NAME (decl))) 1384 write_literal_operator_name (DECL_NAME (decl)); 1385 else 1386 found = false; 1387 } 1388 1389 if (found) 1390 /* OK */; 1391 else if (VAR_OR_FUNCTION_DECL_P (decl) && ! TREE_PUBLIC (decl) 1392 && DECL_NAMESPACE_SCOPE_P (decl) 1393 && decl_linkage (decl) == lk_internal) 1394 { 1395 MANGLE_TRACE_TREE ("local-source-name", decl); 1396 write_char ('L'); 1397 write_source_name (DECL_NAME (decl)); 1398 /* The default discriminator is 1, and that's all we ever use, 1399 so there's no code to output one here. */ 1400 } 1401 else 1402 { 1403 tree type = TREE_TYPE (decl); 1404 1405 if (TREE_CODE (decl) == TYPE_DECL 1406 && TYPE_UNNAMED_P (type)) 1407 write_unnamed_type_name (type); 1408 else if (TREE_CODE (decl) == TYPE_DECL 1409 && LAMBDA_TYPE_P (type)) 1410 write_closure_type_name (type); 1411 else 1412 write_source_name (DECL_NAME (decl)); 1413 } 1414 1415 /* We use the ABI tags from the primary class template, ignoring tags on any 1416 specializations. This is necessary because C++ doesn't require a 1417 specialization to be declared before it is used unless the use requires a 1418 complete type, but we need to get the tags right on incomplete types as 1419 well. */ 1420 if (tree tmpl = most_general_template (decl)) 1421 { 1422 tree res = DECL_TEMPLATE_RESULT (tmpl); 1423 if (res == NULL_TREE) 1424 /* UNBOUND_CLASS_TEMPLATE. */; 1425 else if (DECL_DECLARES_TYPE_P (decl)) 1426 decl = res; 1427 else if (any_abi_below (11)) 1428 { 1429 /* ABI v10 implicit tags on the template. */ 1430 tree mtags = missing_abi_tags (res); 1431 /* Explicit tags on the template. */ 1432 tree ttags = get_abi_tags (res); 1433 /* Tags on the instantiation. */ 1434 tree dtags = get_abi_tags (decl); 1435 1436 if (mtags && abi_warn_or_compat_version_crosses (10)) 1437 G.need_abi_warning = 1; 1438 1439 /* Add the v10 tags to the explicit tags now. */ 1440 mtags = chainon (mtags, ttags); 1441 1442 if (!G.need_abi_warning 1443 && abi_warn_or_compat_version_crosses (11) 1444 && !equal_abi_tags (dtags, mtags)) 1445 G.need_abi_warning = 1; 1446 1447 if (!abi_version_at_least (10)) 1448 /* In abi <10, we only got the explicit tags. */ 1449 decl = res; 1450 else if (flag_abi_version == 10) 1451 { 1452 /* In ABI 10, we want explict and implicit tags. */ 1453 write_abi_tags (mtags); 1454 return; 1455 } 1456 } 1457 } 1458 1459 tree tags = get_abi_tags (decl); 1460 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_CONV_FN_P (decl) 1461 && any_abi_below (11)) 1462 if (tree mtags = missing_abi_tags (decl)) 1463 { 1464 if (abi_warn_or_compat_version_crosses (11)) 1465 G.need_abi_warning = true; 1466 if (!abi_version_at_least (11)) 1467 tags = chainon (mtags, tags); 1468 } 1469 write_abi_tags (tags); 1470 } 1471 1472 /* Write the unqualified-name for a conversion operator to TYPE. */ 1473 1474 static void 1475 write_conversion_operator_name (const tree type) 1476 { 1477 write_string ("cv"); 1478 write_type (type); 1479 } 1480 1481 /* Non-terminal <source-name>. IDENTIFIER is an IDENTIFIER_NODE. 1482 1483 <source-name> ::= </length/ number> <identifier> */ 1484 1485 static void 1486 write_source_name (tree identifier) 1487 { 1488 MANGLE_TRACE_TREE ("source-name", identifier); 1489 1490 write_unsigned_number (IDENTIFIER_LENGTH (identifier)); 1491 write_identifier (IDENTIFIER_POINTER (identifier)); 1492 } 1493 1494 /* Compare two TREE_STRINGs like strcmp. */ 1495 1496 int 1497 tree_string_cmp (const void *p1, const void *p2) 1498 { 1499 if (p1 == p2) 1500 return 0; 1501 tree s1 = *(const tree*)p1; 1502 tree s2 = *(const tree*)p2; 1503 return strcmp (TREE_STRING_POINTER (s1), 1504 TREE_STRING_POINTER (s2)); 1505 } 1506 1507 /* Return the TREE_LIST of TAGS as a sorted VEC. */ 1508 1509 static vec<tree, va_gc> * 1510 sorted_abi_tags (tree tags) 1511 { 1512 vec<tree, va_gc> * vec = make_tree_vector(); 1513 1514 for (tree t = tags; t; t = TREE_CHAIN (t)) 1515 { 1516 if (ABI_TAG_IMPLICIT (t)) 1517 continue; 1518 tree str = TREE_VALUE (t); 1519 vec_safe_push (vec, str); 1520 } 1521 1522 vec->qsort (tree_string_cmp); 1523 1524 return vec; 1525 } 1526 1527 /* ID is the name of a function or type with abi_tags attribute TAGS. 1528 Write out the name, suitably decorated. */ 1529 1530 static void 1531 write_abi_tags (tree tags) 1532 { 1533 if (tags == NULL_TREE) 1534 return; 1535 1536 vec<tree, va_gc> * vec = sorted_abi_tags (tags); 1537 1538 unsigned i; tree str; 1539 FOR_EACH_VEC_ELT (*vec, i, str) 1540 { 1541 write_string ("B"); 1542 write_unsigned_number (TREE_STRING_LENGTH (str) - 1); 1543 write_identifier (TREE_STRING_POINTER (str)); 1544 } 1545 1546 release_tree_vector (vec); 1547 } 1548 1549 /* Simplified unique_ptr clone to release a tree vec on exit. */ 1550 1551 struct releasing_vec 1552 { 1553 typedef vec<tree, va_gc> vec_t; 1554 1555 releasing_vec (vec_t *v): v(v) { } 1556 releasing_vec (): v(make_tree_vector ()) { } 1557 1558 vec_t &operator* () const { return *v; } 1559 vec_t *operator-> () const { return v; } 1560 vec_t *get () const { return v; } 1561 operator vec_t *() const { return v; } 1562 tree& operator[] (unsigned i) const { return (*v)[i]; } 1563 1564 ~releasing_vec() { release_tree_vector (v); } 1565 private: 1566 vec_t *v; 1567 }; 1568 1569 /* True iff the TREE_LISTS T1 and T2 of ABI tags are equivalent. */ 1570 1571 static bool 1572 equal_abi_tags (tree t1, tree t2) 1573 { 1574 releasing_vec v1 = sorted_abi_tags (t1); 1575 releasing_vec v2 = sorted_abi_tags (t2); 1576 1577 unsigned len1 = v1->length(); 1578 if (len1 != v2->length()) 1579 return false; 1580 for (unsigned i = 0; i < len1; ++i) 1581 if (tree_string_cmp (v1[i], v2[i]) != 0) 1582 return false; 1583 return true; 1584 } 1585 1586 /* Write a user-defined literal operator. 1587 ::= li <source-name> # "" <source-name> 1588 IDENTIFIER is an LITERAL_IDENTIFIER_NODE. */ 1589 1590 static void 1591 write_literal_operator_name (tree identifier) 1592 { 1593 const char* suffix = UDLIT_OP_SUFFIX (identifier); 1594 write_identifier (UDLIT_OP_MANGLED_PREFIX); 1595 write_unsigned_number (strlen (suffix)); 1596 write_identifier (suffix); 1597 } 1598 1599 /* Encode 0 as _, and 1+ as n-1_. */ 1600 1601 static void 1602 write_compact_number (int num) 1603 { 1604 if (num > 0) 1605 write_unsigned_number (num - 1); 1606 write_char ('_'); 1607 } 1608 1609 /* Return how many unnamed types precede TYPE in its enclosing class. */ 1610 1611 static int 1612 nested_anon_class_index (tree type) 1613 { 1614 int index = 0; 1615 tree member = TYPE_FIELDS (TYPE_CONTEXT (type)); 1616 for (; member; member = DECL_CHAIN (member)) 1617 if (DECL_IMPLICIT_TYPEDEF_P (member)) 1618 { 1619 tree memtype = TREE_TYPE (member); 1620 if (memtype == type) 1621 return index; 1622 else if (TYPE_UNNAMED_P (memtype)) 1623 ++index; 1624 } 1625 1626 if (seen_error ()) 1627 return -1; 1628 1629 gcc_unreachable (); 1630 } 1631 1632 /* <unnamed-type-name> ::= Ut [ <nonnegative number> ] _ */ 1633 1634 static void 1635 write_unnamed_type_name (const tree type) 1636 { 1637 int discriminator; 1638 MANGLE_TRACE_TREE ("unnamed-type-name", type); 1639 1640 if (TYPE_FUNCTION_SCOPE_P (type)) 1641 discriminator = local_class_index (type); 1642 else if (TYPE_CLASS_SCOPE_P (type)) 1643 discriminator = nested_anon_class_index (type); 1644 else 1645 { 1646 gcc_assert (no_linkage_check (type, /*relaxed_p=*/true)); 1647 /* Just use the old mangling at namespace scope. */ 1648 write_source_name (TYPE_IDENTIFIER (type)); 1649 return; 1650 } 1651 1652 write_string ("Ut"); 1653 write_compact_number (discriminator); 1654 } 1655 1656 /* <closure-type-name> ::= Ul <lambda-sig> E [ <nonnegative number> ] _ 1657 <lambda-sig> ::= <parameter type>+ # Parameter types or "v" if the lambda has no parameters */ 1658 1659 static void 1660 write_closure_type_name (const tree type) 1661 { 1662 tree fn = lambda_function (type); 1663 tree lambda = CLASSTYPE_LAMBDA_EXPR (type); 1664 tree parms = TYPE_ARG_TYPES (TREE_TYPE (fn)); 1665 1666 MANGLE_TRACE_TREE ("closure-type-name", type); 1667 1668 write_string ("Ul"); 1669 write_method_parms (parms, /*method_p=*/1, fn); 1670 write_char ('E'); 1671 write_compact_number (LAMBDA_EXPR_DISCRIMINATOR (lambda)); 1672 } 1673 1674 /* Convert NUMBER to ascii using base BASE and generating at least 1675 MIN_DIGITS characters. BUFFER points to the _end_ of the buffer 1676 into which to store the characters. Returns the number of 1677 characters generated (these will be laid out in advance of where 1678 BUFFER points). */ 1679 1680 static int 1681 hwint_to_ascii (unsigned HOST_WIDE_INT number, const unsigned int base, 1682 char *buffer, const unsigned int min_digits) 1683 { 1684 static const char base_digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; 1685 unsigned digits = 0; 1686 1687 while (number) 1688 { 1689 unsigned HOST_WIDE_INT d = number / base; 1690 1691 *--buffer = base_digits[number - d * base]; 1692 digits++; 1693 number = d; 1694 } 1695 while (digits < min_digits) 1696 { 1697 *--buffer = base_digits[0]; 1698 digits++; 1699 } 1700 return digits; 1701 } 1702 1703 /* Non-terminal <number>. 1704 1705 <number> ::= [n] </decimal integer/> */ 1706 1707 static void 1708 write_number (unsigned HOST_WIDE_INT number, const int unsigned_p, 1709 const unsigned int base) 1710 { 1711 char buffer[sizeof (HOST_WIDE_INT) * 8]; 1712 unsigned count = 0; 1713 1714 if (!unsigned_p && (HOST_WIDE_INT) number < 0) 1715 { 1716 write_char ('n'); 1717 number = -((HOST_WIDE_INT) number); 1718 } 1719 count = hwint_to_ascii (number, base, buffer + sizeof (buffer), 1); 1720 write_chars (buffer + sizeof (buffer) - count, count); 1721 } 1722 1723 /* Write out an integral CST in decimal. Most numbers are small, and 1724 representable in a HOST_WIDE_INT. Occasionally we'll have numbers 1725 bigger than that, which we must deal with. */ 1726 1727 static inline void 1728 write_integer_cst (const tree cst) 1729 { 1730 int sign = tree_int_cst_sgn (cst); 1731 widest_int abs_value = wi::abs (wi::to_widest (cst)); 1732 if (!wi::fits_uhwi_p (abs_value)) 1733 { 1734 /* A bignum. We do this in chunks, each of which fits in a 1735 HOST_WIDE_INT. */ 1736 char buffer[sizeof (HOST_WIDE_INT) * 8 * 2]; 1737 unsigned HOST_WIDE_INT chunk; 1738 unsigned chunk_digits; 1739 char *ptr = buffer + sizeof (buffer); 1740 unsigned count = 0; 1741 tree n, base, type; 1742 int done; 1743 1744 /* HOST_WIDE_INT must be at least 32 bits, so 10^9 is 1745 representable. */ 1746 chunk = 1000000000; 1747 chunk_digits = 9; 1748 1749 if (sizeof (HOST_WIDE_INT) >= 8) 1750 { 1751 /* It is at least 64 bits, so 10^18 is representable. */ 1752 chunk_digits = 18; 1753 chunk *= chunk; 1754 } 1755 1756 type = c_common_signed_or_unsigned_type (1, TREE_TYPE (cst)); 1757 base = build_int_cstu (type, chunk); 1758 n = wide_int_to_tree (type, wi::to_wide (cst)); 1759 1760 if (sign < 0) 1761 { 1762 write_char ('n'); 1763 n = fold_build1_loc (input_location, NEGATE_EXPR, type, n); 1764 } 1765 do 1766 { 1767 tree d = fold_build2_loc (input_location, FLOOR_DIV_EXPR, type, n, base); 1768 tree tmp = fold_build2_loc (input_location, MULT_EXPR, type, d, base); 1769 unsigned c; 1770 1771 done = integer_zerop (d); 1772 tmp = fold_build2_loc (input_location, MINUS_EXPR, type, n, tmp); 1773 c = hwint_to_ascii (TREE_INT_CST_LOW (tmp), 10, ptr, 1774 done ? 1 : chunk_digits); 1775 ptr -= c; 1776 count += c; 1777 n = d; 1778 } 1779 while (!done); 1780 write_chars (ptr, count); 1781 } 1782 else 1783 { 1784 /* A small num. */ 1785 if (sign < 0) 1786 write_char ('n'); 1787 write_unsigned_number (abs_value.to_uhwi ()); 1788 } 1789 } 1790 1791 /* Write out a floating-point literal. 1792 1793 "Floating-point literals are encoded using the bit pattern of the 1794 target processor's internal representation of that number, as a 1795 fixed-length lowercase hexadecimal string, high-order bytes first 1796 (even if the target processor would store low-order bytes first). 1797 The "n" prefix is not used for floating-point literals; the sign 1798 bit is encoded with the rest of the number. 1799 1800 Here are some examples, assuming the IEEE standard representation 1801 for floating point numbers. (Spaces are for readability, not 1802 part of the encoding.) 1803 1804 1.0f Lf 3f80 0000 E 1805 -1.0f Lf bf80 0000 E 1806 1.17549435e-38f Lf 0080 0000 E 1807 1.40129846e-45f Lf 0000 0001 E 1808 0.0f Lf 0000 0000 E" 1809 1810 Caller is responsible for the Lx and the E. */ 1811 static void 1812 write_real_cst (const tree value) 1813 { 1814 long target_real[4]; /* largest supported float */ 1815 /* Buffer for eight hex digits in a 32-bit number but big enough 1816 even for 64-bit long to avoid warnings. */ 1817 char buffer[17]; 1818 int i, limit, dir; 1819 1820 tree type = TREE_TYPE (value); 1821 int words = GET_MODE_BITSIZE (SCALAR_FLOAT_TYPE_MODE (type)) / 32; 1822 1823 real_to_target (target_real, &TREE_REAL_CST (value), 1824 TYPE_MODE (type)); 1825 1826 /* The value in target_real is in the target word order, 1827 so we must write it out backward if that happens to be 1828 little-endian. write_number cannot be used, it will 1829 produce uppercase. */ 1830 if (FLOAT_WORDS_BIG_ENDIAN) 1831 i = 0, limit = words, dir = 1; 1832 else 1833 i = words - 1, limit = -1, dir = -1; 1834 1835 for (; i != limit; i += dir) 1836 { 1837 sprintf (buffer, "%08lx", (unsigned long) target_real[i]); 1838 write_chars (buffer, 8); 1839 } 1840 } 1841 1842 /* Non-terminal <identifier>. 1843 1844 <identifier> ::= </unqualified source code identifier> */ 1845 1846 static void 1847 write_identifier (const char *identifier) 1848 { 1849 MANGLE_TRACE ("identifier", identifier); 1850 write_string (identifier); 1851 } 1852 1853 /* Handle constructor productions of non-terminal <special-name>. 1854 CTOR is a constructor FUNCTION_DECL. 1855 1856 <special-name> ::= C1 # complete object constructor 1857 ::= C2 # base object constructor 1858 ::= C3 # complete object allocating constructor 1859 1860 Currently, allocating constructors are never used. */ 1861 1862 static void 1863 write_special_name_constructor (const tree ctor) 1864 { 1865 write_char ('C'); 1866 bool new_inh = (flag_new_inheriting_ctors 1867 && DECL_INHERITED_CTOR (ctor)); 1868 if (new_inh) 1869 write_char ('I'); 1870 if (DECL_BASE_CONSTRUCTOR_P (ctor)) 1871 write_char ('2'); 1872 /* This is the old-style "[unified]" constructor. 1873 In some cases, we may emit this function and call 1874 it from the clones in order to share code and save space. */ 1875 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (ctor)) 1876 write_char ('4'); 1877 else 1878 { 1879 gcc_assert (DECL_COMPLETE_CONSTRUCTOR_P (ctor)); 1880 write_char ('1'); 1881 } 1882 if (new_inh) 1883 write_type (DECL_INHERITED_CTOR_BASE (ctor)); 1884 } 1885 1886 /* Handle destructor productions of non-terminal <special-name>. 1887 DTOR is a destructor FUNCTION_DECL. 1888 1889 <special-name> ::= D0 # deleting (in-charge) destructor 1890 ::= D1 # complete object (in-charge) destructor 1891 ::= D2 # base object (not-in-charge) destructor */ 1892 1893 static void 1894 write_special_name_destructor (const tree dtor) 1895 { 1896 if (DECL_DELETING_DESTRUCTOR_P (dtor)) 1897 write_string ("D0"); 1898 else if (DECL_BASE_DESTRUCTOR_P (dtor)) 1899 write_string ("D2"); 1900 else if (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (dtor)) 1901 /* This is the old-style "[unified]" destructor. 1902 In some cases, we may emit this function and call 1903 it from the clones in order to share code and save space. */ 1904 write_string ("D4"); 1905 else 1906 { 1907 gcc_assert (DECL_COMPLETE_DESTRUCTOR_P (dtor)); 1908 write_string ("D1"); 1909 } 1910 } 1911 1912 /* Scan the vector of local classes and return how many others with the 1913 same name (or same no name) and context precede ENTITY. */ 1914 1915 static int 1916 local_class_index (tree entity) 1917 { 1918 int ix, discriminator = 0; 1919 tree name = (TYPE_UNNAMED_P (entity) ? NULL_TREE 1920 : TYPE_IDENTIFIER (entity)); 1921 tree ctx = TYPE_CONTEXT (entity); 1922 for (ix = 0; ; ix++) 1923 { 1924 tree type = (*local_classes)[ix]; 1925 if (type == entity) 1926 return discriminator; 1927 if (TYPE_CONTEXT (type) == ctx 1928 && (name ? TYPE_IDENTIFIER (type) == name 1929 : TYPE_UNNAMED_P (type))) 1930 ++discriminator; 1931 } 1932 gcc_unreachable (); 1933 } 1934 1935 /* Return the discriminator for ENTITY appearing inside 1936 FUNCTION. The discriminator is the lexical ordinal of VAR among 1937 entities with the same name in the same FUNCTION. */ 1938 1939 static int 1940 discriminator_for_local_entity (tree entity) 1941 { 1942 if (DECL_DISCRIMINATOR_P (entity)) 1943 { 1944 if (DECL_DISCRIMINATOR_SET_P (entity)) 1945 return DECL_DISCRIMINATOR (entity); 1946 else 1947 /* The first entity with a particular name doesn't get 1948 DECL_DISCRIMINATOR set up. */ 1949 return 0; 1950 } 1951 else if (TREE_CODE (entity) == TYPE_DECL) 1952 { 1953 /* Scan the list of local classes. */ 1954 entity = TREE_TYPE (entity); 1955 1956 /* Lambdas and unnamed types have their own discriminators. */ 1957 if (LAMBDA_TYPE_P (entity) || TYPE_UNNAMED_P (entity)) 1958 return 0; 1959 1960 return local_class_index (entity); 1961 } 1962 else 1963 gcc_unreachable (); 1964 } 1965 1966 /* Return the discriminator for STRING, a string literal used inside 1967 FUNCTION. The discriminator is the lexical ordinal of STRING among 1968 string literals used in FUNCTION. */ 1969 1970 static int 1971 discriminator_for_string_literal (tree /*function*/, 1972 tree /*string*/) 1973 { 1974 /* For now, we don't discriminate amongst string literals. */ 1975 return 0; 1976 } 1977 1978 /* <discriminator> := _ <number> # when number < 10 1979 := __ <number> _ # when number >= 10 1980 1981 The discriminator is used only for the second and later occurrences 1982 of the same name within a single function. In this case <number> is 1983 n - 2, if this is the nth occurrence, in lexical order. */ 1984 1985 static void 1986 write_discriminator (const int discriminator) 1987 { 1988 /* If discriminator is zero, don't write anything. Otherwise... */ 1989 if (discriminator > 0) 1990 { 1991 write_char ('_'); 1992 if (discriminator - 1 >= 10) 1993 { 1994 if (abi_warn_or_compat_version_crosses (11)) 1995 G.need_abi_warning = 1; 1996 if (abi_version_at_least (11)) 1997 write_char ('_'); 1998 } 1999 write_unsigned_number (discriminator - 1); 2000 if (abi_version_at_least (11) && discriminator - 1 >= 10) 2001 write_char ('_'); 2002 } 2003 } 2004 2005 /* Mangle the name of a function-scope entity. FUNCTION is the 2006 FUNCTION_DECL for the enclosing function, or a PARM_DECL for lambdas in 2007 default argument scope. ENTITY is the decl for the entity itself. 2008 LOCAL_ENTITY is the entity that's directly scoped in FUNCTION_DECL, 2009 either ENTITY itself or an enclosing scope of ENTITY. 2010 2011 <local-name> := Z <function encoding> E <entity name> [<discriminator>] 2012 := Z <function encoding> E s [<discriminator>] 2013 := Z <function encoding> Ed [ <parameter number> ] _ <entity name> */ 2014 2015 static void 2016 write_local_name (tree function, const tree local_entity, 2017 const tree entity) 2018 { 2019 tree parm = NULL_TREE; 2020 2021 MANGLE_TRACE_TREE ("local-name", entity); 2022 2023 if (TREE_CODE (function) == PARM_DECL) 2024 { 2025 parm = function; 2026 function = DECL_CONTEXT (parm); 2027 } 2028 2029 write_char ('Z'); 2030 write_encoding (function); 2031 write_char ('E'); 2032 2033 /* For this purpose, parameters are numbered from right-to-left. */ 2034 if (parm) 2035 { 2036 tree t; 2037 int i = 0; 2038 for (t = DECL_ARGUMENTS (function); t; t = DECL_CHAIN (t)) 2039 { 2040 if (t == parm) 2041 i = 1; 2042 else if (i) 2043 ++i; 2044 } 2045 write_char ('d'); 2046 write_compact_number (i - 1); 2047 } 2048 2049 if (TREE_CODE (entity) == STRING_CST) 2050 { 2051 write_char ('s'); 2052 write_discriminator (discriminator_for_string_literal (function, 2053 entity)); 2054 } 2055 else 2056 { 2057 /* Now the <entity name>. Let write_name know its being called 2058 from <local-name>, so it doesn't try to process the enclosing 2059 function scope again. */ 2060 write_name (entity, /*ignore_local_scope=*/1); 2061 write_discriminator (discriminator_for_local_entity (local_entity)); 2062 } 2063 } 2064 2065 /* Non-terminals <type> and <CV-qualifier>. 2066 2067 <type> ::= <builtin-type> 2068 ::= <function-type> 2069 ::= <class-enum-type> 2070 ::= <array-type> 2071 ::= <pointer-to-member-type> 2072 ::= <template-param> 2073 ::= <substitution> 2074 ::= <CV-qualifier> 2075 ::= P <type> # pointer-to 2076 ::= R <type> # reference-to 2077 ::= C <type> # complex pair (C 2000) 2078 ::= G <type> # imaginary (C 2000) [not supported] 2079 ::= U <source-name> <type> # vendor extended type qualifier 2080 2081 C++0x extensions 2082 2083 <type> ::= RR <type> # rvalue reference-to 2084 <type> ::= Dt <expression> # decltype of an id-expression or 2085 # class member access 2086 <type> ::= DT <expression> # decltype of an expression 2087 <type> ::= Dn # decltype of nullptr 2088 2089 TYPE is a type node. */ 2090 2091 static void 2092 write_type (tree type) 2093 { 2094 /* This gets set to nonzero if TYPE turns out to be a (possibly 2095 CV-qualified) builtin type. */ 2096 int is_builtin_type = 0; 2097 2098 MANGLE_TRACE_TREE ("type", type); 2099 2100 if (type == error_mark_node) 2101 return; 2102 2103 type = canonicalize_for_substitution (type); 2104 if (find_substitution (type)) 2105 return; 2106 2107 2108 if (write_CV_qualifiers_for_type (type) > 0) 2109 /* If TYPE was CV-qualified, we just wrote the qualifiers; now 2110 mangle the unqualified type. The recursive call is needed here 2111 since both the qualified and unqualified types are substitution 2112 candidates. */ 2113 { 2114 tree t = TYPE_MAIN_VARIANT (type); 2115 if (TYPE_ATTRIBUTES (t) && !OVERLOAD_TYPE_P (t)) 2116 { 2117 tree attrs = NULL_TREE; 2118 if (tx_safe_fn_type_p (type)) 2119 attrs = tree_cons (get_identifier ("transaction_safe"), 2120 NULL_TREE, attrs); 2121 t = cp_build_type_attribute_variant (t, attrs); 2122 } 2123 gcc_assert (t != type); 2124 if (TREE_CODE (t) == FUNCTION_TYPE 2125 || TREE_CODE (t) == METHOD_TYPE) 2126 { 2127 t = build_ref_qualified_type (t, type_memfn_rqual (type)); 2128 if (flag_noexcept_type) 2129 { 2130 tree r = TYPE_RAISES_EXCEPTIONS (type); 2131 t = build_exception_variant (t, r); 2132 } 2133 if (abi_version_at_least (8) 2134 || type == TYPE_MAIN_VARIANT (type)) 2135 /* Avoid adding the unqualified function type as a substitution. */ 2136 write_function_type (t); 2137 else 2138 write_type (t); 2139 if (abi_warn_or_compat_version_crosses (8)) 2140 G.need_abi_warning = 1; 2141 } 2142 else 2143 write_type (t); 2144 } 2145 else if (TREE_CODE (type) == ARRAY_TYPE) 2146 /* It is important not to use the TYPE_MAIN_VARIANT of TYPE here 2147 so that the cv-qualification of the element type is available 2148 in write_array_type. */ 2149 write_array_type (type); 2150 else 2151 { 2152 tree type_orig = type; 2153 2154 /* See through any typedefs. */ 2155 type = TYPE_MAIN_VARIANT (type); 2156 if (TREE_CODE (type) == FUNCTION_TYPE 2157 || TREE_CODE (type) == METHOD_TYPE) 2158 { 2159 type = build_ref_qualified_type (type, type_memfn_rqual (type_orig)); 2160 type = build_exception_variant (type, 2161 TYPE_RAISES_EXCEPTIONS (type_orig)); 2162 } 2163 2164 /* According to the C++ ABI, some library classes are passed the 2165 same as the scalar type of their single member and use the same 2166 mangling. */ 2167 if (TREE_CODE (type) == RECORD_TYPE && TYPE_TRANSPARENT_AGGR (type)) 2168 type = TREE_TYPE (first_field (type)); 2169 2170 if (TYPE_PTRDATAMEM_P (type)) 2171 write_pointer_to_member_type (type); 2172 else 2173 { 2174 /* Handle any target-specific fundamental types. */ 2175 const char *target_mangling 2176 = targetm.mangle_type (type_orig); 2177 2178 if (target_mangling) 2179 { 2180 write_string (target_mangling); 2181 /* Add substitutions for types other than fundamental 2182 types. */ 2183 if (!VOID_TYPE_P (type) 2184 && TREE_CODE (type) != INTEGER_TYPE 2185 && TREE_CODE (type) != REAL_TYPE 2186 && TREE_CODE (type) != BOOLEAN_TYPE) 2187 add_substitution (type); 2188 return; 2189 } 2190 2191 switch (TREE_CODE (type)) 2192 { 2193 case VOID_TYPE: 2194 case BOOLEAN_TYPE: 2195 case INTEGER_TYPE: /* Includes wchar_t. */ 2196 case REAL_TYPE: 2197 case FIXED_POINT_TYPE: 2198 { 2199 /* If this is a typedef, TYPE may not be one of 2200 the standard builtin type nodes, but an alias of one. Use 2201 TYPE_MAIN_VARIANT to get to the underlying builtin type. */ 2202 write_builtin_type (TYPE_MAIN_VARIANT (type)); 2203 ++is_builtin_type; 2204 } 2205 break; 2206 2207 case COMPLEX_TYPE: 2208 write_char ('C'); 2209 write_type (TREE_TYPE (type)); 2210 break; 2211 2212 case FUNCTION_TYPE: 2213 case METHOD_TYPE: 2214 write_function_type (type); 2215 break; 2216 2217 case UNION_TYPE: 2218 case RECORD_TYPE: 2219 case ENUMERAL_TYPE: 2220 /* A pointer-to-member function is represented as a special 2221 RECORD_TYPE, so check for this first. */ 2222 if (TYPE_PTRMEMFUNC_P (type)) 2223 write_pointer_to_member_type (type); 2224 else 2225 write_class_enum_type (type); 2226 break; 2227 2228 case TYPENAME_TYPE: 2229 case UNBOUND_CLASS_TEMPLATE: 2230 /* We handle TYPENAME_TYPEs and UNBOUND_CLASS_TEMPLATEs like 2231 ordinary nested names. */ 2232 write_nested_name (TYPE_STUB_DECL (type)); 2233 break; 2234 2235 case POINTER_TYPE: 2236 case REFERENCE_TYPE: 2237 if (TYPE_PTR_P (type)) 2238 write_char ('P'); 2239 else if (TYPE_REF_IS_RVALUE (type)) 2240 write_char ('O'); 2241 else 2242 write_char ('R'); 2243 { 2244 tree target = TREE_TYPE (type); 2245 /* Attribute const/noreturn are not reflected in mangling. 2246 We strip them here rather than at a lower level because 2247 a typedef or template argument can have function type 2248 with function-cv-quals (that use the same representation), 2249 but you can't have a pointer/reference to such a type. */ 2250 if (TREE_CODE (target) == FUNCTION_TYPE) 2251 { 2252 if (abi_warn_or_compat_version_crosses (5) 2253 && TYPE_QUALS (target) != TYPE_UNQUALIFIED) 2254 G.need_abi_warning = 1; 2255 if (abi_version_at_least (5)) 2256 target = build_qualified_type (target, TYPE_UNQUALIFIED); 2257 } 2258 write_type (target); 2259 } 2260 break; 2261 2262 case TEMPLATE_TYPE_PARM: 2263 if (is_auto (type)) 2264 { 2265 if (AUTO_IS_DECLTYPE (type)) 2266 write_identifier ("Dc"); 2267 else 2268 write_identifier ("Da"); 2269 ++is_builtin_type; 2270 break; 2271 } 2272 /* fall through. */ 2273 case TEMPLATE_PARM_INDEX: 2274 write_template_param (type); 2275 break; 2276 2277 case TEMPLATE_TEMPLATE_PARM: 2278 write_template_template_param (type); 2279 break; 2280 2281 case BOUND_TEMPLATE_TEMPLATE_PARM: 2282 write_template_template_param (type); 2283 write_template_args 2284 (TI_ARGS (TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (type))); 2285 break; 2286 2287 case VECTOR_TYPE: 2288 if (abi_version_at_least (4)) 2289 { 2290 write_string ("Dv"); 2291 /* Non-constant vector size would be encoded with 2292 _ expression, but we don't support that yet. */ 2293 write_unsigned_number (TYPE_VECTOR_SUBPARTS (type) 2294 .to_constant ()); 2295 write_char ('_'); 2296 } 2297 else 2298 write_string ("U8__vector"); 2299 if (abi_warn_or_compat_version_crosses (4)) 2300 G.need_abi_warning = 1; 2301 write_type (TREE_TYPE (type)); 2302 break; 2303 2304 case TYPE_PACK_EXPANSION: 2305 write_string ("Dp"); 2306 write_type (PACK_EXPANSION_PATTERN (type)); 2307 break; 2308 2309 case DECLTYPE_TYPE: 2310 /* These shouldn't make it into mangling. */ 2311 gcc_assert (!DECLTYPE_FOR_LAMBDA_CAPTURE (type) 2312 && !DECLTYPE_FOR_LAMBDA_PROXY (type)); 2313 2314 /* In ABI <5, we stripped decltype of a plain decl. */ 2315 if (DECLTYPE_TYPE_ID_EXPR_OR_MEMBER_ACCESS_P (type)) 2316 { 2317 tree expr = DECLTYPE_TYPE_EXPR (type); 2318 tree etype = NULL_TREE; 2319 switch (TREE_CODE (expr)) 2320 { 2321 case VAR_DECL: 2322 case PARM_DECL: 2323 case RESULT_DECL: 2324 case FUNCTION_DECL: 2325 case CONST_DECL: 2326 case TEMPLATE_PARM_INDEX: 2327 etype = TREE_TYPE (expr); 2328 break; 2329 2330 default: 2331 break; 2332 } 2333 2334 if (etype && !type_uses_auto (etype)) 2335 { 2336 if (abi_warn_or_compat_version_crosses (5)) 2337 G.need_abi_warning = 1; 2338 if (!abi_version_at_least (5)) 2339 { 2340 write_type (etype); 2341 return; 2342 } 2343 } 2344 } 2345 2346 write_char ('D'); 2347 if (DECLTYPE_TYPE_ID_EXPR_OR_MEMBER_ACCESS_P (type)) 2348 write_char ('t'); 2349 else 2350 write_char ('T'); 2351 ++cp_unevaluated_operand; 2352 write_expression (DECLTYPE_TYPE_EXPR (type)); 2353 --cp_unevaluated_operand; 2354 write_char ('E'); 2355 break; 2356 2357 case NULLPTR_TYPE: 2358 write_string ("Dn"); 2359 if (abi_version_at_least (7)) 2360 ++is_builtin_type; 2361 if (abi_warn_or_compat_version_crosses (7)) 2362 G.need_abi_warning = 1; 2363 break; 2364 2365 case TYPEOF_TYPE: 2366 sorry ("mangling typeof, use decltype instead"); 2367 break; 2368 2369 case UNDERLYING_TYPE: 2370 sorry ("mangling __underlying_type"); 2371 break; 2372 2373 case LANG_TYPE: 2374 /* fall through. */ 2375 2376 default: 2377 gcc_unreachable (); 2378 } 2379 } 2380 } 2381 2382 /* Types other than builtin types are substitution candidates. */ 2383 if (!is_builtin_type) 2384 add_substitution (type); 2385 } 2386 2387 /* qsort callback for sorting a vector of attribute entries. */ 2388 2389 static int 2390 attr_strcmp (const void *p1, const void *p2) 2391 { 2392 tree a1 = *(const tree*)p1; 2393 tree a2 = *(const tree*)p2; 2394 2395 const attribute_spec *as1 = lookup_attribute_spec (get_attribute_name (a1)); 2396 const attribute_spec *as2 = lookup_attribute_spec (get_attribute_name (a2)); 2397 2398 return strcmp (as1->name, as2->name); 2399 } 2400 2401 /* Non-terminal <CV-qualifiers> for type nodes. Returns the number of 2402 CV-qualifiers written for TYPE. 2403 2404 <CV-qualifiers> ::= [r] [V] [K] */ 2405 2406 static int 2407 write_CV_qualifiers_for_type (const tree type) 2408 { 2409 int num_qualifiers = 0; 2410 2411 /* The order is specified by: 2412 2413 "In cases where multiple order-insensitive qualifiers are 2414 present, they should be ordered 'K' (closest to the base type), 2415 'V', 'r', and 'U' (farthest from the base type) ..." */ 2416 2417 /* Mangle attributes that affect type identity as extended qualifiers. 2418 2419 We don't do this with classes and enums because their attributes 2420 are part of their definitions, not something added on. */ 2421 2422 if (!OVERLOAD_TYPE_P (type)) 2423 { 2424 auto_vec<tree> vec; 2425 for (tree a = TYPE_ATTRIBUTES (type); a; a = TREE_CHAIN (a)) 2426 { 2427 tree name = get_attribute_name (a); 2428 const attribute_spec *as = lookup_attribute_spec (name); 2429 if (as && as->affects_type_identity 2430 && !is_attribute_p ("transaction_safe", name) 2431 && !is_attribute_p ("abi_tag", name)) 2432 vec.safe_push (a); 2433 } 2434 if (abi_warn_or_compat_version_crosses (10) && !vec.is_empty ()) 2435 G.need_abi_warning = true; 2436 if (abi_version_at_least (10)) 2437 { 2438 vec.qsort (attr_strcmp); 2439 while (!vec.is_empty()) 2440 { 2441 tree a = vec.pop(); 2442 const attribute_spec *as 2443 = lookup_attribute_spec (get_attribute_name (a)); 2444 2445 write_char ('U'); 2446 write_unsigned_number (strlen (as->name)); 2447 write_string (as->name); 2448 if (TREE_VALUE (a)) 2449 { 2450 write_char ('I'); 2451 for (tree args = TREE_VALUE (a); args; 2452 args = TREE_CHAIN (args)) 2453 { 2454 tree arg = TREE_VALUE (args); 2455 write_template_arg (arg); 2456 } 2457 write_char ('E'); 2458 } 2459 2460 ++num_qualifiers; 2461 } 2462 } 2463 } 2464 2465 /* Note that we do not use cp_type_quals below; given "const 2466 int[3]", the "const" is emitted with the "int", not with the 2467 array. */ 2468 cp_cv_quals quals = TYPE_QUALS (type); 2469 2470 if (quals & TYPE_QUAL_RESTRICT) 2471 { 2472 write_char ('r'); 2473 ++num_qualifiers; 2474 } 2475 if (quals & TYPE_QUAL_VOLATILE) 2476 { 2477 write_char ('V'); 2478 ++num_qualifiers; 2479 } 2480 if (quals & TYPE_QUAL_CONST) 2481 { 2482 write_char ('K'); 2483 ++num_qualifiers; 2484 } 2485 2486 return num_qualifiers; 2487 } 2488 2489 /* Non-terminal <builtin-type>. 2490 2491 <builtin-type> ::= v # void 2492 ::= b # bool 2493 ::= w # wchar_t 2494 ::= c # char 2495 ::= a # signed char 2496 ::= h # unsigned char 2497 ::= s # short 2498 ::= t # unsigned short 2499 ::= i # int 2500 ::= j # unsigned int 2501 ::= l # long 2502 ::= m # unsigned long 2503 ::= x # long long, __int64 2504 ::= y # unsigned long long, __int64 2505 ::= n # __int128 2506 ::= o # unsigned __int128 2507 ::= f # float 2508 ::= d # double 2509 ::= e # long double, __float80 2510 ::= g # __float128 [not supported] 2511 ::= u <source-name> # vendor extended type */ 2512 2513 static void 2514 write_builtin_type (tree type) 2515 { 2516 if (TYPE_CANONICAL (type)) 2517 type = TYPE_CANONICAL (type); 2518 2519 switch (TREE_CODE (type)) 2520 { 2521 case VOID_TYPE: 2522 write_char ('v'); 2523 break; 2524 2525 case BOOLEAN_TYPE: 2526 write_char ('b'); 2527 break; 2528 2529 case INTEGER_TYPE: 2530 /* TYPE may still be wchar_t, char16_t, or char32_t, since that 2531 isn't in integer_type_nodes. */ 2532 if (type == wchar_type_node) 2533 write_char ('w'); 2534 else if (type == char16_type_node) 2535 write_string ("Ds"); 2536 else if (type == char32_type_node) 2537 write_string ("Di"); 2538 else 2539 { 2540 size_t itk; 2541 /* Assume TYPE is one of the shared integer type nodes. Find 2542 it in the array of these nodes. */ 2543 iagain: 2544 for (itk = 0; itk < itk_none; ++itk) 2545 if (integer_types[itk] != NULL_TREE 2546 && integer_type_codes[itk] != '\0' 2547 && type == integer_types[itk]) 2548 { 2549 /* Print the corresponding single-letter code. */ 2550 write_char (integer_type_codes[itk]); 2551 break; 2552 } 2553 2554 if (itk == itk_none) 2555 { 2556 tree t = c_common_type_for_mode (TYPE_MODE (type), 2557 TYPE_UNSIGNED (type)); 2558 if (type != t) 2559 { 2560 type = t; 2561 goto iagain; 2562 } 2563 2564 if (TYPE_PRECISION (type) == 128) 2565 write_char (TYPE_UNSIGNED (type) ? 'o' : 'n'); 2566 else 2567 { 2568 /* Allow for cases where TYPE is not one of the shared 2569 integer type nodes and write a "vendor extended builtin 2570 type" with a name the form intN or uintN, respectively. 2571 Situations like this can happen if you have an 2572 __attribute__((__mode__(__SI__))) type and use exotic 2573 switches like '-mint8' on AVR. Of course, this is 2574 undefined by the C++ ABI (and '-mint8' is not even 2575 Standard C conforming), but when using such special 2576 options you're pretty much in nowhere land anyway. */ 2577 const char *prefix; 2578 char prec[11]; /* up to ten digits for an unsigned */ 2579 2580 prefix = TYPE_UNSIGNED (type) ? "uint" : "int"; 2581 sprintf (prec, "%u", (unsigned) TYPE_PRECISION (type)); 2582 write_char ('u'); /* "vendor extended builtin type" */ 2583 write_unsigned_number (strlen (prefix) + strlen (prec)); 2584 write_string (prefix); 2585 write_string (prec); 2586 } 2587 } 2588 } 2589 break; 2590 2591 case REAL_TYPE: 2592 if (type == float_type_node) 2593 write_char ('f'); 2594 else if (type == double_type_node) 2595 write_char ('d'); 2596 else if (type == long_double_type_node) 2597 write_char ('e'); 2598 else if (type == dfloat32_type_node) 2599 write_string ("Df"); 2600 else if (type == dfloat64_type_node) 2601 write_string ("Dd"); 2602 else if (type == dfloat128_type_node) 2603 write_string ("De"); 2604 else 2605 gcc_unreachable (); 2606 break; 2607 2608 case FIXED_POINT_TYPE: 2609 write_string ("DF"); 2610 if (GET_MODE_IBIT (TYPE_MODE (type)) > 0) 2611 write_unsigned_number (GET_MODE_IBIT (TYPE_MODE (type))); 2612 if (type == fract_type_node 2613 || type == sat_fract_type_node 2614 || type == accum_type_node 2615 || type == sat_accum_type_node) 2616 write_char ('i'); 2617 else if (type == unsigned_fract_type_node 2618 || type == sat_unsigned_fract_type_node 2619 || type == unsigned_accum_type_node 2620 || type == sat_unsigned_accum_type_node) 2621 write_char ('j'); 2622 else if (type == short_fract_type_node 2623 || type == sat_short_fract_type_node 2624 || type == short_accum_type_node 2625 || type == sat_short_accum_type_node) 2626 write_char ('s'); 2627 else if (type == unsigned_short_fract_type_node 2628 || type == sat_unsigned_short_fract_type_node 2629 || type == unsigned_short_accum_type_node 2630 || type == sat_unsigned_short_accum_type_node) 2631 write_char ('t'); 2632 else if (type == long_fract_type_node 2633 || type == sat_long_fract_type_node 2634 || type == long_accum_type_node 2635 || type == sat_long_accum_type_node) 2636 write_char ('l'); 2637 else if (type == unsigned_long_fract_type_node 2638 || type == sat_unsigned_long_fract_type_node 2639 || type == unsigned_long_accum_type_node 2640 || type == sat_unsigned_long_accum_type_node) 2641 write_char ('m'); 2642 else if (type == long_long_fract_type_node 2643 || type == sat_long_long_fract_type_node 2644 || type == long_long_accum_type_node 2645 || type == sat_long_long_accum_type_node) 2646 write_char ('x'); 2647 else if (type == unsigned_long_long_fract_type_node 2648 || type == sat_unsigned_long_long_fract_type_node 2649 || type == unsigned_long_long_accum_type_node 2650 || type == sat_unsigned_long_long_accum_type_node) 2651 write_char ('y'); 2652 else 2653 sorry ("mangling unknown fixed point type"); 2654 write_unsigned_number (GET_MODE_FBIT (TYPE_MODE (type))); 2655 if (TYPE_SATURATING (type)) 2656 write_char ('s'); 2657 else 2658 write_char ('n'); 2659 break; 2660 2661 default: 2662 gcc_unreachable (); 2663 } 2664 } 2665 2666 /* Non-terminal <function-type>. NODE is a FUNCTION_TYPE or 2667 METHOD_TYPE. The return type is mangled before the parameter 2668 types. 2669 2670 <function-type> ::= F [Y] <bare-function-type> [<ref-qualifier>] E */ 2671 2672 static void 2673 write_function_type (const tree type) 2674 { 2675 MANGLE_TRACE_TREE ("function-type", type); 2676 2677 /* For a pointer to member function, the function type may have 2678 cv-qualifiers, indicating the quals for the artificial 'this' 2679 parameter. */ 2680 if (TREE_CODE (type) == METHOD_TYPE) 2681 { 2682 /* The first parameter must be a POINTER_TYPE pointing to the 2683 `this' parameter. */ 2684 tree this_type = class_of_this_parm (type); 2685 write_CV_qualifiers_for_type (this_type); 2686 } 2687 2688 write_exception_spec (TYPE_RAISES_EXCEPTIONS (type)); 2689 2690 if (tx_safe_fn_type_p (type)) 2691 write_string ("Dx"); 2692 2693 write_char ('F'); 2694 /* We don't track whether or not a type is `extern "C"'. Note that 2695 you can have an `extern "C"' function that does not have 2696 `extern "C"' type, and vice versa: 2697 2698 extern "C" typedef void function_t(); 2699 function_t f; // f has C++ linkage, but its type is 2700 // `extern "C"' 2701 2702 typedef void function_t(); 2703 extern "C" function_t f; // Vice versa. 2704 2705 See [dcl.link]. */ 2706 write_bare_function_type (type, /*include_return_type_p=*/1, 2707 /*decl=*/NULL); 2708 if (FUNCTION_REF_QUALIFIED (type)) 2709 { 2710 if (FUNCTION_RVALUE_QUALIFIED (type)) 2711 write_char ('O'); 2712 else 2713 write_char ('R'); 2714 } 2715 write_char ('E'); 2716 } 2717 2718 /* Non-terminal <bare-function-type>. TYPE is a FUNCTION_TYPE or 2719 METHOD_TYPE. If INCLUDE_RETURN_TYPE is nonzero, the return value 2720 is mangled before the parameter types. If non-NULL, DECL is 2721 FUNCTION_DECL for the function whose type is being emitted. */ 2722 2723 static void 2724 write_bare_function_type (const tree type, const int include_return_type_p, 2725 const tree decl) 2726 { 2727 MANGLE_TRACE_TREE ("bare-function-type", type); 2728 2729 /* Mangle the return type, if requested. */ 2730 if (include_return_type_p) 2731 write_type (TREE_TYPE (type)); 2732 2733 /* Now mangle the types of the arguments. */ 2734 ++G.parm_depth; 2735 write_method_parms (TYPE_ARG_TYPES (type), 2736 TREE_CODE (type) == METHOD_TYPE, 2737 decl); 2738 --G.parm_depth; 2739 } 2740 2741 /* Write the mangled representation of a method parameter list of 2742 types given in PARM_TYPES. If METHOD_P is nonzero, the function is 2743 considered a non-static method, and the this parameter is omitted. 2744 If non-NULL, DECL is the FUNCTION_DECL for the function whose 2745 parameters are being emitted. */ 2746 2747 static void 2748 write_method_parms (tree parm_types, const int method_p, const tree decl) 2749 { 2750 tree first_parm_type; 2751 tree parm_decl = decl ? DECL_ARGUMENTS (decl) : NULL_TREE; 2752 2753 /* Assume this parameter type list is variable-length. If it ends 2754 with a void type, then it's not. */ 2755 int varargs_p = 1; 2756 2757 /* If this is a member function, skip the first arg, which is the 2758 this pointer. 2759 "Member functions do not encode the type of their implicit this 2760 parameter." 2761 2762 Similarly, there's no need to mangle artificial parameters, like 2763 the VTT parameters for constructors and destructors. */ 2764 if (method_p) 2765 { 2766 parm_types = TREE_CHAIN (parm_types); 2767 parm_decl = parm_decl ? DECL_CHAIN (parm_decl) : NULL_TREE; 2768 2769 while (parm_decl && DECL_ARTIFICIAL (parm_decl)) 2770 { 2771 parm_types = TREE_CHAIN (parm_types); 2772 parm_decl = DECL_CHAIN (parm_decl); 2773 } 2774 2775 if (decl && ctor_omit_inherited_parms (decl)) 2776 /* Bring back parameters omitted from an inherited ctor. */ 2777 parm_types = FUNCTION_FIRST_USER_PARMTYPE (DECL_ORIGIN (decl)); 2778 } 2779 2780 for (first_parm_type = parm_types; 2781 parm_types; 2782 parm_types = TREE_CHAIN (parm_types)) 2783 { 2784 tree parm = TREE_VALUE (parm_types); 2785 if (parm == void_type_node) 2786 { 2787 /* "Empty parameter lists, whether declared as () or 2788 conventionally as (void), are encoded with a void parameter 2789 (v)." */ 2790 if (parm_types == first_parm_type) 2791 write_type (parm); 2792 /* If the parm list is terminated with a void type, it's 2793 fixed-length. */ 2794 varargs_p = 0; 2795 /* A void type better be the last one. */ 2796 gcc_assert (TREE_CHAIN (parm_types) == NULL); 2797 } 2798 else 2799 write_type (parm); 2800 } 2801 2802 if (varargs_p) 2803 /* <builtin-type> ::= z # ellipsis */ 2804 write_char ('z'); 2805 } 2806 2807 /* <class-enum-type> ::= <name> */ 2808 2809 static void 2810 write_class_enum_type (const tree type) 2811 { 2812 write_name (TYPE_NAME (type), /*ignore_local_scope=*/0); 2813 } 2814 2815 /* Non-terminal <template-args>. ARGS is a TREE_VEC of template 2816 arguments. 2817 2818 <template-args> ::= I <template-arg>* E */ 2819 2820 static void 2821 write_template_args (tree args) 2822 { 2823 int i; 2824 int length = 0; 2825 2826 MANGLE_TRACE_TREE ("template-args", args); 2827 2828 write_char ('I'); 2829 2830 if (args) 2831 length = TREE_VEC_LENGTH (args); 2832 2833 if (args && length && TREE_CODE (TREE_VEC_ELT (args, 0)) == TREE_VEC) 2834 { 2835 /* We have nested template args. We want the innermost template 2836 argument list. */ 2837 args = TREE_VEC_ELT (args, length - 1); 2838 length = TREE_VEC_LENGTH (args); 2839 } 2840 for (i = 0; i < length; ++i) 2841 write_template_arg (TREE_VEC_ELT (args, i)); 2842 2843 write_char ('E'); 2844 } 2845 2846 /* Write out the 2847 <unqualified-name> 2848 <unqualified-name> <template-args> 2849 part of SCOPE_REF or COMPONENT_REF mangling. */ 2850 2851 static void 2852 write_member_name (tree member) 2853 { 2854 if (identifier_p (member)) 2855 { 2856 if (abi_version_at_least (11) && IDENTIFIER_ANY_OP_P (member)) 2857 { 2858 write_string ("on"); 2859 if (abi_warn_or_compat_version_crosses (11)) 2860 G.need_abi_warning = 1; 2861 } 2862 write_unqualified_id (member); 2863 } 2864 else if (DECL_P (member)) 2865 write_unqualified_name (member); 2866 else if (TREE_CODE (member) == TEMPLATE_ID_EXPR) 2867 { 2868 tree name = TREE_OPERAND (member, 0); 2869 name = OVL_FIRST (name); 2870 write_member_name (name); 2871 write_template_args (TREE_OPERAND (member, 1)); 2872 } 2873 else 2874 write_expression (member); 2875 } 2876 2877 /* <expression> ::= <unary operator-name> <expression> 2878 ::= <binary operator-name> <expression> <expression> 2879 ::= <expr-primary> 2880 2881 <expr-primary> ::= <template-param> 2882 ::= L <type> <value number> E # literal 2883 ::= L <mangled-name> E # external name 2884 ::= st <type> # sizeof 2885 ::= sr <type> <unqualified-name> # dependent name 2886 ::= sr <type> <unqualified-name> <template-args> */ 2887 2888 static void 2889 write_expression (tree expr) 2890 { 2891 enum tree_code code = TREE_CODE (expr); 2892 2893 /* Skip NOP_EXPR and CONVERT_EXPR. They can occur when (say) a pointer 2894 argument is converted (via qualification conversions) to another type. */ 2895 while (CONVERT_EXPR_CODE_P (code) 2896 || location_wrapper_p (expr) 2897 /* Parentheses aren't mangled. */ 2898 || code == PAREN_EXPR 2899 || code == NON_LVALUE_EXPR) 2900 { 2901 expr = TREE_OPERAND (expr, 0); 2902 code = TREE_CODE (expr); 2903 } 2904 2905 if (code == BASELINK 2906 && (!type_unknown_p (expr) 2907 || !BASELINK_QUALIFIED_P (expr))) 2908 { 2909 expr = BASELINK_FUNCTIONS (expr); 2910 code = TREE_CODE (expr); 2911 } 2912 2913 /* Handle pointers-to-members by making them look like expression 2914 nodes. */ 2915 if (code == PTRMEM_CST) 2916 { 2917 expr = build_nt (ADDR_EXPR, 2918 build_qualified_name (/*type=*/NULL_TREE, 2919 PTRMEM_CST_CLASS (expr), 2920 PTRMEM_CST_MEMBER (expr), 2921 /*template_p=*/false)); 2922 code = TREE_CODE (expr); 2923 } 2924 2925 /* Handle template parameters. */ 2926 if (code == TEMPLATE_TYPE_PARM 2927 || code == TEMPLATE_TEMPLATE_PARM 2928 || code == BOUND_TEMPLATE_TEMPLATE_PARM 2929 || code == TEMPLATE_PARM_INDEX) 2930 write_template_param (expr); 2931 /* Handle literals. */ 2932 else if (TREE_CODE_CLASS (code) == tcc_constant 2933 || code == CONST_DECL) 2934 write_template_arg_literal (expr); 2935 else if (code == PARM_DECL && DECL_ARTIFICIAL (expr)) 2936 { 2937 gcc_assert (id_equal (DECL_NAME (expr), "this")); 2938 write_string ("fpT"); 2939 } 2940 else if (code == PARM_DECL) 2941 { 2942 /* A function parameter used in a late-specified return type. */ 2943 int index = DECL_PARM_INDEX (expr); 2944 int level = DECL_PARM_LEVEL (expr); 2945 int delta = G.parm_depth - level + 1; 2946 gcc_assert (index >= 1); 2947 write_char ('f'); 2948 if (delta != 0) 2949 { 2950 if (abi_version_at_least (5)) 2951 { 2952 /* Let L be the number of function prototype scopes from the 2953 innermost one (in which the parameter reference occurs) up 2954 to (and including) the one containing the declaration of 2955 the referenced parameter. If the parameter declaration 2956 clause of the innermost function prototype scope has been 2957 completely seen, it is not counted (in that case -- which 2958 is perhaps the most common -- L can be zero). */ 2959 write_char ('L'); 2960 write_unsigned_number (delta - 1); 2961 } 2962 if (abi_warn_or_compat_version_crosses (5)) 2963 G.need_abi_warning = true; 2964 } 2965 write_char ('p'); 2966 write_compact_number (index - 1); 2967 } 2968 else if (DECL_P (expr)) 2969 { 2970 write_char ('L'); 2971 write_mangled_name (expr, false); 2972 write_char ('E'); 2973 } 2974 else if (TREE_CODE (expr) == SIZEOF_EXPR) 2975 { 2976 tree op = TREE_OPERAND (expr, 0); 2977 2978 if (PACK_EXPANSION_P (op)) 2979 { 2980 if (abi_warn_or_compat_version_crosses (11)) 2981 G.need_abi_warning = true; 2982 if (abi_version_at_least (11)) 2983 { 2984 /* sZ rather than szDp. */ 2985 write_string ("sZ"); 2986 write_expression (PACK_EXPANSION_PATTERN (op)); 2987 return; 2988 } 2989 } 2990 2991 if (SIZEOF_EXPR_TYPE_P (expr)) 2992 { 2993 write_string ("st"); 2994 write_type (TREE_TYPE (op)); 2995 } 2996 else if (ARGUMENT_PACK_P (op)) 2997 { 2998 tree args = ARGUMENT_PACK_ARGS (op); 2999 int length = TREE_VEC_LENGTH (args); 3000 if (abi_warn_or_compat_version_crosses (10)) 3001 G.need_abi_warning = true; 3002 if (abi_version_at_least (10)) 3003 { 3004 /* sP <template-arg>* E # sizeof...(T), size of a captured 3005 template parameter pack from an alias template */ 3006 write_string ("sP"); 3007 for (int i = 0; i < length; ++i) 3008 write_template_arg (TREE_VEC_ELT (args, i)); 3009 write_char ('E'); 3010 } 3011 else 3012 { 3013 /* In GCC 5 we represented this sizeof wrong, with the effect 3014 that we mangled it as the last element of the pack. */ 3015 tree arg = TREE_VEC_ELT (args, length-1); 3016 if (TYPE_P (op)) 3017 { 3018 write_string ("st"); 3019 write_type (arg); 3020 } 3021 else 3022 { 3023 write_string ("sz"); 3024 write_expression (arg); 3025 } 3026 } 3027 } 3028 else if (TYPE_P (TREE_OPERAND (expr, 0))) 3029 { 3030 write_string ("st"); 3031 write_type (TREE_OPERAND (expr, 0)); 3032 } 3033 else 3034 goto normal_expr; 3035 } 3036 else if (TREE_CODE (expr) == ALIGNOF_EXPR 3037 && TYPE_P (TREE_OPERAND (expr, 0))) 3038 { 3039 write_string ("at"); 3040 write_type (TREE_OPERAND (expr, 0)); 3041 } 3042 else if (code == SCOPE_REF 3043 || code == BASELINK) 3044 { 3045 tree scope, member; 3046 if (code == SCOPE_REF) 3047 { 3048 scope = TREE_OPERAND (expr, 0); 3049 member = TREE_OPERAND (expr, 1); 3050 gcc_assert (!BASELINK_P (member)); 3051 } 3052 else 3053 { 3054 scope = BINFO_TYPE (BASELINK_ACCESS_BINFO (expr)); 3055 member = BASELINK_FUNCTIONS (expr); 3056 } 3057 3058 /* If the MEMBER is a real declaration, then the qualifying 3059 scope was not dependent. Ideally, we would not have a 3060 SCOPE_REF in those cases, but sometimes we do. If the second 3061 argument is a DECL, then the name must not have been 3062 dependent. */ 3063 if (DECL_P (member)) 3064 write_expression (member); 3065 else 3066 { 3067 write_string ("sr"); 3068 write_type (scope); 3069 write_member_name (member); 3070 } 3071 } 3072 else if (INDIRECT_REF_P (expr) 3073 && TREE_TYPE (TREE_OPERAND (expr, 0)) 3074 && TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == REFERENCE_TYPE) 3075 { 3076 write_expression (TREE_OPERAND (expr, 0)); 3077 } 3078 else if (identifier_p (expr)) 3079 { 3080 /* An operator name appearing as a dependent name needs to be 3081 specially marked to disambiguate between a use of the operator 3082 name and a use of the operator in an expression. */ 3083 if (IDENTIFIER_ANY_OP_P (expr)) 3084 write_string ("on"); 3085 write_unqualified_id (expr); 3086 } 3087 else if (TREE_CODE (expr) == TEMPLATE_ID_EXPR) 3088 { 3089 tree fn = TREE_OPERAND (expr, 0); 3090 fn = OVL_NAME (fn); 3091 if (IDENTIFIER_ANY_OP_P (fn)) 3092 write_string ("on"); 3093 write_unqualified_id (fn); 3094 write_template_args (TREE_OPERAND (expr, 1)); 3095 } 3096 else if (TREE_CODE (expr) == MODOP_EXPR) 3097 { 3098 enum tree_code subop = TREE_CODE (TREE_OPERAND (expr, 1)); 3099 const char *name = OVL_OP_INFO (true, subop)->mangled_name; 3100 3101 write_string (name); 3102 write_expression (TREE_OPERAND (expr, 0)); 3103 write_expression (TREE_OPERAND (expr, 2)); 3104 } 3105 else if (code == NEW_EXPR || code == VEC_NEW_EXPR) 3106 { 3107 /* ::= [gs] nw <expression>* _ <type> E 3108 ::= [gs] nw <expression>* _ <type> <initializer> 3109 ::= [gs] na <expression>* _ <type> E 3110 ::= [gs] na <expression>* _ <type> <initializer> 3111 <initializer> ::= pi <expression>* E */ 3112 tree placement = TREE_OPERAND (expr, 0); 3113 tree type = TREE_OPERAND (expr, 1); 3114 tree nelts = TREE_OPERAND (expr, 2); 3115 tree init = TREE_OPERAND (expr, 3); 3116 tree t; 3117 3118 gcc_assert (code == NEW_EXPR); 3119 if (TREE_OPERAND (expr, 2)) 3120 code = VEC_NEW_EXPR; 3121 3122 if (NEW_EXPR_USE_GLOBAL (expr)) 3123 write_string ("gs"); 3124 3125 write_string (OVL_OP_INFO (false, code)->mangled_name); 3126 3127 for (t = placement; t; t = TREE_CHAIN (t)) 3128 write_expression (TREE_VALUE (t)); 3129 3130 write_char ('_'); 3131 3132 if (nelts) 3133 { 3134 tree domain; 3135 ++processing_template_decl; 3136 domain = compute_array_index_type (NULL_TREE, nelts, 3137 tf_warning_or_error); 3138 type = build_cplus_array_type (type, domain); 3139 --processing_template_decl; 3140 } 3141 write_type (type); 3142 3143 if (init && TREE_CODE (init) == TREE_LIST 3144 && DIRECT_LIST_INIT_P (TREE_VALUE (init))) 3145 write_expression (TREE_VALUE (init)); 3146 else 3147 { 3148 if (init) 3149 write_string ("pi"); 3150 if (init && init != void_node) 3151 for (t = init; t; t = TREE_CHAIN (t)) 3152 write_expression (TREE_VALUE (t)); 3153 write_char ('E'); 3154 } 3155 } 3156 else if (code == DELETE_EXPR || code == VEC_DELETE_EXPR) 3157 { 3158 gcc_assert (code == DELETE_EXPR); 3159 if (DELETE_EXPR_USE_VEC (expr)) 3160 code = VEC_DELETE_EXPR; 3161 3162 if (DELETE_EXPR_USE_GLOBAL (expr)) 3163 write_string ("gs"); 3164 3165 write_string (OVL_OP_INFO (false, code)->mangled_name); 3166 3167 write_expression (TREE_OPERAND (expr, 0)); 3168 } 3169 else if (code == THROW_EXPR) 3170 { 3171 tree op = TREE_OPERAND (expr, 0); 3172 if (op) 3173 { 3174 write_string ("tw"); 3175 write_expression (op); 3176 } 3177 else 3178 write_string ("tr"); 3179 } 3180 else if (code == CONSTRUCTOR) 3181 { 3182 vec<constructor_elt, va_gc> *elts = CONSTRUCTOR_ELTS (expr); 3183 unsigned i; tree val; 3184 3185 if (BRACE_ENCLOSED_INITIALIZER_P (expr)) 3186 write_string ("il"); 3187 else 3188 { 3189 write_string ("tl"); 3190 write_type (TREE_TYPE (expr)); 3191 } 3192 FOR_EACH_CONSTRUCTOR_VALUE (elts, i, val) 3193 write_expression (val); 3194 write_char ('E'); 3195 } 3196 else if (dependent_name (expr)) 3197 { 3198 write_unqualified_id (dependent_name (expr)); 3199 } 3200 else 3201 { 3202 normal_expr: 3203 int i, len; 3204 const char *name; 3205 3206 /* When we bind a variable or function to a non-type template 3207 argument with reference type, we create an ADDR_EXPR to show 3208 the fact that the entity's address has been taken. But, we 3209 don't actually want to output a mangling code for the `&'. */ 3210 if (TREE_CODE (expr) == ADDR_EXPR 3211 && TREE_TYPE (expr) 3212 && TREE_CODE (TREE_TYPE (expr)) == REFERENCE_TYPE) 3213 { 3214 expr = TREE_OPERAND (expr, 0); 3215 if (DECL_P (expr)) 3216 { 3217 write_expression (expr); 3218 return; 3219 } 3220 3221 code = TREE_CODE (expr); 3222 } 3223 3224 if (code == COMPONENT_REF) 3225 { 3226 tree ob = TREE_OPERAND (expr, 0); 3227 3228 if (TREE_CODE (ob) == ARROW_EXPR) 3229 { 3230 write_string (OVL_OP_INFO (false, code)->mangled_name); 3231 ob = TREE_OPERAND (ob, 0); 3232 write_expression (ob); 3233 } 3234 else if (!is_dummy_object (ob)) 3235 { 3236 write_string ("dt"); 3237 write_expression (ob); 3238 } 3239 /* else, for a non-static data member with no associated object (in 3240 unevaluated context), use the unresolved-name mangling. */ 3241 3242 write_member_name (TREE_OPERAND (expr, 1)); 3243 return; 3244 } 3245 3246 /* If it wasn't any of those, recursively expand the expression. */ 3247 name = OVL_OP_INFO (false, code)->mangled_name; 3248 3249 /* We used to mangle const_cast and static_cast like a C cast. */ 3250 if (code == CONST_CAST_EXPR 3251 || code == STATIC_CAST_EXPR) 3252 { 3253 if (abi_warn_or_compat_version_crosses (6)) 3254 G.need_abi_warning = 1; 3255 if (!abi_version_at_least (6)) 3256 name = OVL_OP_INFO (false, CAST_EXPR)->mangled_name; 3257 } 3258 3259 if (name == NULL) 3260 { 3261 switch (code) 3262 { 3263 case TRAIT_EXPR: 3264 error ("use of built-in trait %qE in function signature; " 3265 "use library traits instead", expr); 3266 break; 3267 3268 default: 3269 sorry ("mangling %C", code); 3270 break; 3271 } 3272 return; 3273 } 3274 else 3275 write_string (name); 3276 3277 switch (code) 3278 { 3279 case CALL_EXPR: 3280 { 3281 tree fn = CALL_EXPR_FN (expr); 3282 3283 if (TREE_CODE (fn) == ADDR_EXPR) 3284 fn = TREE_OPERAND (fn, 0); 3285 3286 /* Mangle a dependent name as the name, not whatever happens to 3287 be the first function in the overload set. */ 3288 if ((TREE_CODE (fn) == FUNCTION_DECL 3289 || TREE_CODE (fn) == OVERLOAD) 3290 && type_dependent_expression_p_push (expr)) 3291 fn = OVL_NAME (fn); 3292 3293 write_expression (fn); 3294 } 3295 3296 for (i = 0; i < call_expr_nargs (expr); ++i) 3297 write_expression (CALL_EXPR_ARG (expr, i)); 3298 write_char ('E'); 3299 break; 3300 3301 case CAST_EXPR: 3302 write_type (TREE_TYPE (expr)); 3303 if (list_length (TREE_OPERAND (expr, 0)) == 1) 3304 write_expression (TREE_VALUE (TREE_OPERAND (expr, 0))); 3305 else 3306 { 3307 tree args = TREE_OPERAND (expr, 0); 3308 write_char ('_'); 3309 for (; args; args = TREE_CHAIN (args)) 3310 write_expression (TREE_VALUE (args)); 3311 write_char ('E'); 3312 } 3313 break; 3314 3315 case DYNAMIC_CAST_EXPR: 3316 case REINTERPRET_CAST_EXPR: 3317 case STATIC_CAST_EXPR: 3318 case CONST_CAST_EXPR: 3319 write_type (TREE_TYPE (expr)); 3320 write_expression (TREE_OPERAND (expr, 0)); 3321 break; 3322 3323 case PREINCREMENT_EXPR: 3324 case PREDECREMENT_EXPR: 3325 if (abi_version_at_least (6)) 3326 write_char ('_'); 3327 if (abi_warn_or_compat_version_crosses (6)) 3328 G.need_abi_warning = 1; 3329 /* Fall through. */ 3330 3331 default: 3332 /* In the middle-end, some expressions have more operands than 3333 they do in templates (and mangling). */ 3334 len = cp_tree_operand_length (expr); 3335 3336 for (i = 0; i < len; ++i) 3337 { 3338 tree operand = TREE_OPERAND (expr, i); 3339 /* As a GNU extension, the middle operand of a 3340 conditional may be omitted. Since expression 3341 manglings are supposed to represent the input token 3342 stream, there's no good way to mangle such an 3343 expression without extending the C++ ABI. */ 3344 if (code == COND_EXPR && i == 1 && !operand) 3345 { 3346 error ("omitted middle operand to %<?:%> operand " 3347 "cannot be mangled"); 3348 continue; 3349 } 3350 else if (FOLD_EXPR_P (expr)) 3351 { 3352 /* The first 'operand' of a fold-expression is the operator 3353 that it folds over. */ 3354 if (i == 0) 3355 { 3356 int fcode = TREE_INT_CST_LOW (operand); 3357 write_string (OVL_OP_INFO (false, fcode)->mangled_name); 3358 continue; 3359 } 3360 else if (code == BINARY_LEFT_FOLD_EXPR) 3361 { 3362 /* The order of operands of the binary left and right 3363 folds is the same, but we want to mangle them in 3364 lexical order, i.e. non-pack first. */ 3365 if (i == 1) 3366 operand = FOLD_EXPR_INIT (expr); 3367 else 3368 operand = FOLD_EXPR_PACK (expr); 3369 } 3370 if (PACK_EXPANSION_P (operand)) 3371 operand = PACK_EXPANSION_PATTERN (operand); 3372 } 3373 write_expression (operand); 3374 } 3375 } 3376 } 3377 } 3378 3379 /* Literal subcase of non-terminal <template-arg>. 3380 3381 "Literal arguments, e.g. "A<42L>", are encoded with their type 3382 and value. Negative integer values are preceded with "n"; for 3383 example, "A<-42L>" becomes "1AILln42EE". The bool value false is 3384 encoded as 0, true as 1." */ 3385 3386 static void 3387 write_template_arg_literal (const tree value) 3388 { 3389 write_char ('L'); 3390 write_type (TREE_TYPE (value)); 3391 3392 /* Write a null member pointer value as (type)0, regardless of its 3393 real representation. */ 3394 if (null_member_pointer_value_p (value)) 3395 write_integer_cst (integer_zero_node); 3396 else 3397 switch (TREE_CODE (value)) 3398 { 3399 case CONST_DECL: 3400 write_integer_cst (DECL_INITIAL (value)); 3401 break; 3402 3403 case INTEGER_CST: 3404 gcc_assert (!same_type_p (TREE_TYPE (value), boolean_type_node) 3405 || integer_zerop (value) || integer_onep (value)); 3406 write_integer_cst (value); 3407 break; 3408 3409 case REAL_CST: 3410 write_real_cst (value); 3411 break; 3412 3413 case COMPLEX_CST: 3414 if (TREE_CODE (TREE_REALPART (value)) == INTEGER_CST 3415 && TREE_CODE (TREE_IMAGPART (value)) == INTEGER_CST) 3416 { 3417 write_integer_cst (TREE_REALPART (value)); 3418 write_char ('_'); 3419 write_integer_cst (TREE_IMAGPART (value)); 3420 } 3421 else if (TREE_CODE (TREE_REALPART (value)) == REAL_CST 3422 && TREE_CODE (TREE_IMAGPART (value)) == REAL_CST) 3423 { 3424 write_real_cst (TREE_REALPART (value)); 3425 write_char ('_'); 3426 write_real_cst (TREE_IMAGPART (value)); 3427 } 3428 else 3429 gcc_unreachable (); 3430 break; 3431 3432 case STRING_CST: 3433 sorry ("string literal in function template signature"); 3434 break; 3435 3436 default: 3437 gcc_unreachable (); 3438 } 3439 3440 write_char ('E'); 3441 } 3442 3443 /* Non-terminal <template-arg>. 3444 3445 <template-arg> ::= <type> # type 3446 ::= L <type> </value/ number> E # literal 3447 ::= LZ <name> E # external name 3448 ::= X <expression> E # expression */ 3449 3450 static void 3451 write_template_arg (tree node) 3452 { 3453 enum tree_code code = TREE_CODE (node); 3454 3455 MANGLE_TRACE_TREE ("template-arg", node); 3456 3457 /* A template template parameter's argument list contains TREE_LIST 3458 nodes of which the value field is the actual argument. */ 3459 if (code == TREE_LIST) 3460 { 3461 node = TREE_VALUE (node); 3462 /* If it's a decl, deal with its type instead. */ 3463 if (DECL_P (node)) 3464 { 3465 node = TREE_TYPE (node); 3466 code = TREE_CODE (node); 3467 } 3468 } 3469 3470 /* Strip a conversion added by convert_nontype_argument. */ 3471 if (TREE_CODE (node) == IMPLICIT_CONV_EXPR) 3472 node = TREE_OPERAND (node, 0); 3473 if (REFERENCE_REF_P (node)) 3474 node = TREE_OPERAND (node, 0); 3475 if (TREE_CODE (node) == NOP_EXPR 3476 && TREE_CODE (TREE_TYPE (node)) == REFERENCE_TYPE) 3477 { 3478 /* Template parameters can be of reference type. To maintain 3479 internal consistency, such arguments use a conversion from 3480 address of object to reference type. */ 3481 gcc_assert (TREE_CODE (TREE_OPERAND (node, 0)) == ADDR_EXPR); 3482 node = TREE_OPERAND (TREE_OPERAND (node, 0), 0); 3483 } 3484 3485 if (TREE_CODE (node) == BASELINK 3486 && !type_unknown_p (node)) 3487 { 3488 if (abi_version_at_least (6)) 3489 node = BASELINK_FUNCTIONS (node); 3490 if (abi_warn_or_compat_version_crosses (6)) 3491 /* We wrongly wrapped a class-scope function in X/E. */ 3492 G.need_abi_warning = 1; 3493 } 3494 3495 if (ARGUMENT_PACK_P (node)) 3496 { 3497 /* Expand the template argument pack. */ 3498 tree args = ARGUMENT_PACK_ARGS (node); 3499 int i, length = TREE_VEC_LENGTH (args); 3500 if (abi_version_at_least (6)) 3501 write_char ('J'); 3502 else 3503 write_char ('I'); 3504 if (abi_warn_or_compat_version_crosses (6)) 3505 G.need_abi_warning = 1; 3506 for (i = 0; i < length; ++i) 3507 write_template_arg (TREE_VEC_ELT (args, i)); 3508 write_char ('E'); 3509 } 3510 else if (TYPE_P (node)) 3511 write_type (node); 3512 else if (code == TEMPLATE_DECL) 3513 /* A template appearing as a template arg is a template template arg. */ 3514 write_template_template_arg (node); 3515 else if ((TREE_CODE_CLASS (code) == tcc_constant && code != PTRMEM_CST) 3516 || code == CONST_DECL 3517 || null_member_pointer_value_p (node)) 3518 write_template_arg_literal (node); 3519 else if (DECL_P (node)) 3520 { 3521 write_char ('L'); 3522 /* Until ABI version 3, the underscore before the mangled name 3523 was incorrectly omitted. */ 3524 if (!abi_version_at_least (3)) 3525 write_char ('Z'); 3526 else 3527 write_string ("_Z"); 3528 if (abi_warn_or_compat_version_crosses (3)) 3529 G.need_abi_warning = 1; 3530 write_encoding (node); 3531 write_char ('E'); 3532 } 3533 else 3534 { 3535 /* Template arguments may be expressions. */ 3536 write_char ('X'); 3537 write_expression (node); 3538 write_char ('E'); 3539 } 3540 } 3541 3542 /* <template-template-arg> 3543 ::= <name> 3544 ::= <substitution> */ 3545 3546 static void 3547 write_template_template_arg (const tree decl) 3548 { 3549 MANGLE_TRACE_TREE ("template-template-arg", decl); 3550 3551 if (find_substitution (decl)) 3552 return; 3553 write_name (decl, /*ignore_local_scope=*/0); 3554 add_substitution (decl); 3555 } 3556 3557 3558 /* Non-terminal <array-type>. TYPE is an ARRAY_TYPE. 3559 3560 <array-type> ::= A [</dimension/ number>] _ </element/ type> 3561 ::= A <expression> _ </element/ type> 3562 3563 "Array types encode the dimension (number of elements) and the 3564 element type. For variable length arrays, the dimension (but not 3565 the '_' separator) is omitted." 3566 Note that for flexible array members, like for other arrays of 3567 unspecified size, the dimension is also omitted. */ 3568 3569 static void 3570 write_array_type (const tree type) 3571 { 3572 write_char ('A'); 3573 if (TYPE_DOMAIN (type)) 3574 { 3575 tree index_type; 3576 3577 index_type = TYPE_DOMAIN (type); 3578 /* The INDEX_TYPE gives the upper and lower bounds of the array. 3579 It's null for flexible array members which have no upper bound 3580 (this is a change from GCC 5 and prior where such members were 3581 incorrectly mangled as zero-length arrays). */ 3582 if (tree max = TYPE_MAX_VALUE (index_type)) 3583 { 3584 if (TREE_CODE (max) == INTEGER_CST) 3585 { 3586 /* The ABI specifies that we should mangle the number of 3587 elements in the array, not the largest allowed index. */ 3588 offset_int wmax = wi::to_offset (max) + 1; 3589 /* Truncate the result - this will mangle [0, SIZE_INT_MAX] 3590 number of elements as zero. */ 3591 wmax = wi::zext (wmax, TYPE_PRECISION (TREE_TYPE (max))); 3592 gcc_assert (wi::fits_uhwi_p (wmax)); 3593 write_unsigned_number (wmax.to_uhwi ()); 3594 } 3595 else 3596 { 3597 max = TREE_OPERAND (max, 0); 3598 write_expression (max); 3599 } 3600 } 3601 } 3602 write_char ('_'); 3603 write_type (TREE_TYPE (type)); 3604 } 3605 3606 /* Non-terminal <pointer-to-member-type> for pointer-to-member 3607 variables. TYPE is a pointer-to-member POINTER_TYPE. 3608 3609 <pointer-to-member-type> ::= M </class/ type> </member/ type> */ 3610 3611 static void 3612 write_pointer_to_member_type (const tree type) 3613 { 3614 write_char ('M'); 3615 write_type (TYPE_PTRMEM_CLASS_TYPE (type)); 3616 write_type (TYPE_PTRMEM_POINTED_TO_TYPE (type)); 3617 } 3618 3619 /* Non-terminal <template-param>. PARM is a TEMPLATE_TYPE_PARM, 3620 TEMPLATE_TEMPLATE_PARM, BOUND_TEMPLATE_TEMPLATE_PARM or a 3621 TEMPLATE_PARM_INDEX. 3622 3623 <template-param> ::= T </parameter/ number> _ */ 3624 3625 static void 3626 write_template_param (const tree parm) 3627 { 3628 int parm_index; 3629 3630 MANGLE_TRACE_TREE ("template-parm", parm); 3631 3632 switch (TREE_CODE (parm)) 3633 { 3634 case TEMPLATE_TYPE_PARM: 3635 case TEMPLATE_TEMPLATE_PARM: 3636 case BOUND_TEMPLATE_TEMPLATE_PARM: 3637 parm_index = TEMPLATE_TYPE_IDX (parm); 3638 break; 3639 3640 case TEMPLATE_PARM_INDEX: 3641 parm_index = TEMPLATE_PARM_IDX (parm); 3642 break; 3643 3644 default: 3645 gcc_unreachable (); 3646 } 3647 3648 write_char ('T'); 3649 /* NUMBER as it appears in the mangling is (-1)-indexed, with the 3650 earliest template param denoted by `_'. */ 3651 write_compact_number (parm_index); 3652 } 3653 3654 /* <template-template-param> 3655 ::= <template-param> 3656 ::= <substitution> */ 3657 3658 static void 3659 write_template_template_param (const tree parm) 3660 { 3661 tree templ = NULL_TREE; 3662 3663 /* PARM, a TEMPLATE_TEMPLATE_PARM, is an instantiation of the 3664 template template parameter. The substitution candidate here is 3665 only the template. */ 3666 if (TREE_CODE (parm) == BOUND_TEMPLATE_TEMPLATE_PARM) 3667 { 3668 templ 3669 = TI_TEMPLATE (TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (parm)); 3670 if (find_substitution (templ)) 3671 return; 3672 } 3673 3674 /* <template-param> encodes only the template parameter position, 3675 not its template arguments, which is fine here. */ 3676 write_template_param (parm); 3677 if (templ) 3678 add_substitution (templ); 3679 } 3680 3681 /* Non-terminal <substitution>. 3682 3683 <substitution> ::= S <seq-id> _ 3684 ::= S_ */ 3685 3686 static void 3687 write_substitution (const int seq_id) 3688 { 3689 MANGLE_TRACE ("substitution", ""); 3690 3691 write_char ('S'); 3692 if (seq_id > 0) 3693 write_number (seq_id - 1, /*unsigned=*/1, 36); 3694 write_char ('_'); 3695 } 3696 3697 /* Start mangling ENTITY. */ 3698 3699 static inline void 3700 start_mangling (const tree entity) 3701 { 3702 G.entity = entity; 3703 G.need_abi_warning = false; 3704 G.need_cxx17_warning = false; 3705 obstack_free (&name_obstack, name_base); 3706 mangle_obstack = &name_obstack; 3707 name_base = obstack_alloc (&name_obstack, 0); 3708 } 3709 3710 /* Done with mangling. If WARN is true, and the name of G.entity will 3711 be mangled differently in a future version of the ABI, issue a 3712 warning. */ 3713 3714 static void 3715 finish_mangling_internal (void) 3716 { 3717 /* Clear all the substitutions. */ 3718 vec_safe_truncate (G.substitutions, 0); 3719 3720 /* Null-terminate the string. */ 3721 write_char ('\0'); 3722 } 3723 3724 3725 /* Like finish_mangling_internal, but return the mangled string. */ 3726 3727 static inline const char * 3728 finish_mangling (void) 3729 { 3730 finish_mangling_internal (); 3731 return (const char *) obstack_finish (mangle_obstack); 3732 } 3733 3734 /* Like finish_mangling_internal, but return an identifier. */ 3735 3736 static tree 3737 finish_mangling_get_identifier (void) 3738 { 3739 finish_mangling_internal (); 3740 /* Don't obstack_finish here, and the next start_mangling will 3741 remove the identifier. */ 3742 return get_identifier ((const char *) obstack_base (mangle_obstack)); 3743 } 3744 3745 /* Initialize data structures for mangling. */ 3746 3747 void 3748 init_mangle (void) 3749 { 3750 gcc_obstack_init (&name_obstack); 3751 name_base = obstack_alloc (&name_obstack, 0); 3752 vec_alloc (G.substitutions, 0); 3753 3754 /* Cache these identifiers for quick comparison when checking for 3755 standard substitutions. */ 3756 subst_identifiers[SUBID_ALLOCATOR] = get_identifier ("allocator"); 3757 subst_identifiers[SUBID_BASIC_STRING] = get_identifier ("basic_string"); 3758 subst_identifiers[SUBID_CHAR_TRAITS] = get_identifier ("char_traits"); 3759 subst_identifiers[SUBID_BASIC_ISTREAM] = get_identifier ("basic_istream"); 3760 subst_identifiers[SUBID_BASIC_OSTREAM] = get_identifier ("basic_ostream"); 3761 subst_identifiers[SUBID_BASIC_IOSTREAM] = get_identifier ("basic_iostream"); 3762 } 3763 3764 /* Generate the mangled name of DECL. */ 3765 3766 static tree 3767 mangle_decl_string (const tree decl) 3768 { 3769 tree result; 3770 location_t saved_loc = input_location; 3771 tree saved_fn = NULL_TREE; 3772 bool template_p = false; 3773 3774 /* We shouldn't be trying to mangle an uninstantiated template. */ 3775 gcc_assert (!type_dependent_expression_p (decl)); 3776 3777 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl)) 3778 { 3779 struct tinst_level *tl = current_instantiation (); 3780 if ((!tl || tl->maybe_get_node () != decl) 3781 && push_tinst_level (decl)) 3782 { 3783 template_p = true; 3784 saved_fn = current_function_decl; 3785 current_function_decl = NULL_TREE; 3786 } 3787 } 3788 input_location = DECL_SOURCE_LOCATION (decl); 3789 3790 start_mangling (decl); 3791 3792 if (TREE_CODE (decl) == TYPE_DECL) 3793 write_type (TREE_TYPE (decl)); 3794 else 3795 write_mangled_name (decl, true); 3796 3797 result = finish_mangling_get_identifier (); 3798 if (DEBUG_MANGLE) 3799 fprintf (stderr, "mangle_decl_string = '%s'\n\n", 3800 IDENTIFIER_POINTER (result)); 3801 3802 if (template_p) 3803 { 3804 pop_tinst_level (); 3805 current_function_decl = saved_fn; 3806 } 3807 input_location = saved_loc; 3808 3809 return result; 3810 } 3811 3812 /* Return an identifier for the external mangled name of DECL. */ 3813 3814 static tree 3815 get_mangled_id (tree decl) 3816 { 3817 tree id = mangle_decl_string (decl); 3818 return targetm.mangle_decl_assembler_name (decl, id); 3819 } 3820 3821 /* Create an identifier for the external mangled name of DECL. */ 3822 3823 void 3824 mangle_decl (const tree decl) 3825 { 3826 tree id; 3827 bool dep; 3828 3829 /* Don't bother mangling uninstantiated templates. */ 3830 ++processing_template_decl; 3831 if (TREE_CODE (decl) == TYPE_DECL) 3832 dep = dependent_type_p (TREE_TYPE (decl)); 3833 else 3834 dep = (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl) 3835 && any_dependent_template_arguments_p (DECL_TI_ARGS (decl))); 3836 --processing_template_decl; 3837 if (dep) 3838 return; 3839 3840 /* During LTO we keep mangled names of TYPE_DECLs for ODR type merging. 3841 It is not needed to assign names to anonymous namespace, but we use the 3842 "<anon>" marker to be able to tell if type is C++ ODR type or type 3843 produced by other language. */ 3844 if (TREE_CODE (decl) == TYPE_DECL 3845 && TYPE_STUB_DECL (TREE_TYPE (decl)) 3846 && !TREE_PUBLIC (TYPE_STUB_DECL (TREE_TYPE (decl)))) 3847 id = get_identifier ("<anon>"); 3848 else 3849 { 3850 gcc_assert (TREE_CODE (decl) != TYPE_DECL 3851 || !no_linkage_check (TREE_TYPE (decl), true)); 3852 if (abi_version_at_least (10)) 3853 if (tree fn = decl_function_context (decl)) 3854 maybe_check_abi_tags (fn, decl); 3855 id = get_mangled_id (decl); 3856 } 3857 SET_DECL_ASSEMBLER_NAME (decl, id); 3858 3859 if (G.need_cxx17_warning 3860 && (TREE_PUBLIC (decl) || DECL_REALLY_EXTERN (decl))) 3861 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wnoexcept_type, 3862 "mangled name for %qD will change in C++17 because the " 3863 "exception specification is part of a function type", 3864 decl); 3865 3866 if (id != DECL_NAME (decl) 3867 /* Don't do this for a fake symbol we aren't going to emit anyway. */ 3868 && TREE_CODE (decl) != TYPE_DECL 3869 && !DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl) 3870 && !DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl)) 3871 { 3872 int save_ver = flag_abi_version; 3873 tree id2 = NULL_TREE; 3874 3875 if (!DECL_REALLY_EXTERN (decl)) 3876 { 3877 record_mangling (decl, G.need_abi_warning); 3878 3879 if (!G.need_abi_warning) 3880 return; 3881 3882 flag_abi_version = flag_abi_compat_version; 3883 id2 = mangle_decl_string (decl); 3884 id2 = targetm.mangle_decl_assembler_name (decl, id2); 3885 flag_abi_version = save_ver; 3886 3887 if (id2 != id) 3888 note_mangling_alias (decl, id2); 3889 } 3890 3891 if (warn_abi) 3892 { 3893 const char fabi_version[] = "-fabi-version"; 3894 3895 if (flag_abi_compat_version != warn_abi_version 3896 || id2 == NULL_TREE) 3897 { 3898 flag_abi_version = warn_abi_version; 3899 id2 = mangle_decl_string (decl); 3900 id2 = targetm.mangle_decl_assembler_name (decl, id2); 3901 } 3902 flag_abi_version = save_ver; 3903 3904 if (id2 == id) 3905 /* OK. */; 3906 else if (warn_abi_version != 0 3907 && abi_version_at_least (warn_abi_version)) 3908 warning_at (DECL_SOURCE_LOCATION (G.entity), OPT_Wabi, 3909 "the mangled name of %qD changed between " 3910 "%<%s=%d%> (%qD) and %<%s=%d%> (%qD)", 3911 G.entity, fabi_version, warn_abi_version, id2, 3912 fabi_version, save_ver, id); 3913 else 3914 warning_at (DECL_SOURCE_LOCATION (G.entity), OPT_Wabi, 3915 "the mangled name of %qD changes between " 3916 "%<%s=%d%> (%qD) and %<%s=%d%> (%qD)", 3917 G.entity, fabi_version, save_ver, id, 3918 fabi_version, warn_abi_version, id2); 3919 } 3920 3921 flag_abi_version = save_ver; 3922 } 3923 } 3924 3925 /* Generate the mangled representation of TYPE. */ 3926 3927 const char * 3928 mangle_type_string (const tree type) 3929 { 3930 const char *result; 3931 3932 start_mangling (type); 3933 write_type (type); 3934 result = finish_mangling (); 3935 if (DEBUG_MANGLE) 3936 fprintf (stderr, "mangle_type_string = '%s'\n\n", result); 3937 return result; 3938 } 3939 3940 /* Create an identifier for the mangled name of a special component 3941 for belonging to TYPE. CODE is the ABI-specified code for this 3942 component. */ 3943 3944 static tree 3945 mangle_special_for_type (const tree type, const char *code) 3946 { 3947 tree result; 3948 3949 /* We don't have an actual decl here for the special component, so 3950 we can't just process the <encoded-name>. Instead, fake it. */ 3951 start_mangling (type); 3952 3953 /* Start the mangling. */ 3954 write_string ("_Z"); 3955 write_string (code); 3956 3957 /* Add the type. */ 3958 write_type (type); 3959 result = finish_mangling_get_identifier (); 3960 3961 if (DEBUG_MANGLE) 3962 fprintf (stderr, "mangle_special_for_type = %s\n\n", 3963 IDENTIFIER_POINTER (result)); 3964 3965 return result; 3966 } 3967 3968 /* Create an identifier for the mangled representation of the typeinfo 3969 structure for TYPE. */ 3970 3971 tree 3972 mangle_typeinfo_for_type (const tree type) 3973 { 3974 return mangle_special_for_type (type, "TI"); 3975 } 3976 3977 /* Create an identifier for the mangled name of the NTBS containing 3978 the mangled name of TYPE. */ 3979 3980 tree 3981 mangle_typeinfo_string_for_type (const tree type) 3982 { 3983 return mangle_special_for_type (type, "TS"); 3984 } 3985 3986 /* Create an identifier for the mangled name of the vtable for TYPE. */ 3987 3988 tree 3989 mangle_vtbl_for_type (const tree type) 3990 { 3991 return mangle_special_for_type (type, "TV"); 3992 } 3993 3994 /* Returns an identifier for the mangled name of the VTT for TYPE. */ 3995 3996 tree 3997 mangle_vtt_for_type (const tree type) 3998 { 3999 return mangle_special_for_type (type, "TT"); 4000 } 4001 4002 /* Returns an identifier for the mangled name of the decomposition 4003 artificial variable DECL. DECLS is the vector of the VAR_DECLs 4004 for the identifier-list. */ 4005 4006 tree 4007 mangle_decomp (const tree decl, vec<tree> &decls) 4008 { 4009 gcc_assert (!type_dependent_expression_p (decl)); 4010 4011 location_t saved_loc = input_location; 4012 input_location = DECL_SOURCE_LOCATION (decl); 4013 4014 start_mangling (decl); 4015 write_string ("_Z"); 4016 4017 tree context = decl_mangling_context (decl); 4018 gcc_assert (context != NULL_TREE); 4019 4020 bool nested = false; 4021 if (DECL_NAMESPACE_STD_P (context)) 4022 write_string ("St"); 4023 else if (context != global_namespace) 4024 { 4025 nested = true; 4026 write_char ('N'); 4027 write_prefix (decl_mangling_context (decl)); 4028 } 4029 4030 write_string ("DC"); 4031 unsigned int i; 4032 tree d; 4033 FOR_EACH_VEC_ELT (decls, i, d) 4034 write_unqualified_name (d); 4035 write_char ('E'); 4036 4037 if (nested) 4038 write_char ('E'); 4039 4040 tree id = finish_mangling_get_identifier (); 4041 if (DEBUG_MANGLE) 4042 fprintf (stderr, "mangle_decomp = '%s'\n\n", 4043 IDENTIFIER_POINTER (id)); 4044 4045 input_location = saved_loc; 4046 return id; 4047 } 4048 4049 /* Return an identifier for a construction vtable group. TYPE is 4050 the most derived class in the hierarchy; BINFO is the base 4051 subobject for which this construction vtable group will be used. 4052 4053 This mangling isn't part of the ABI specification; in the ABI 4054 specification, the vtable group is dumped in the same COMDAT as the 4055 main vtable, and is referenced only from that vtable, so it doesn't 4056 need an external name. For binary formats without COMDAT sections, 4057 though, we need external names for the vtable groups. 4058 4059 We use the production 4060 4061 <special-name> ::= CT <type> <offset number> _ <base type> */ 4062 4063 tree 4064 mangle_ctor_vtbl_for_type (const tree type, const tree binfo) 4065 { 4066 tree result; 4067 4068 start_mangling (type); 4069 4070 write_string ("_Z"); 4071 write_string ("TC"); 4072 write_type (type); 4073 write_integer_cst (BINFO_OFFSET (binfo)); 4074 write_char ('_'); 4075 write_type (BINFO_TYPE (binfo)); 4076 4077 result = finish_mangling_get_identifier (); 4078 if (DEBUG_MANGLE) 4079 fprintf (stderr, "mangle_ctor_vtbl_for_type = %s\n\n", 4080 IDENTIFIER_POINTER (result)); 4081 return result; 4082 } 4083 4084 /* Mangle a this pointer or result pointer adjustment. 4085 4086 <call-offset> ::= h <fixed offset number> _ 4087 ::= v <fixed offset number> _ <virtual offset number> _ */ 4088 4089 static void 4090 mangle_call_offset (const tree fixed_offset, const tree virtual_offset) 4091 { 4092 write_char (virtual_offset ? 'v' : 'h'); 4093 4094 /* For either flavor, write the fixed offset. */ 4095 write_integer_cst (fixed_offset); 4096 write_char ('_'); 4097 4098 /* For a virtual thunk, add the virtual offset. */ 4099 if (virtual_offset) 4100 { 4101 write_integer_cst (virtual_offset); 4102 write_char ('_'); 4103 } 4104 } 4105 4106 /* Return an identifier for the mangled name of a this-adjusting or 4107 covariant thunk to FN_DECL. FIXED_OFFSET is the initial adjustment 4108 to this used to find the vptr. If VIRTUAL_OFFSET is non-NULL, this 4109 is a virtual thunk, and it is the vtbl offset in 4110 bytes. THIS_ADJUSTING is nonzero for a this adjusting thunk and 4111 zero for a covariant thunk. Note, that FN_DECL might be a covariant 4112 thunk itself. A covariant thunk name always includes the adjustment 4113 for the this pointer, even if there is none. 4114 4115 <special-name> ::= T <call-offset> <base encoding> 4116 ::= Tc <this_adjust call-offset> <result_adjust call-offset> 4117 <base encoding> */ 4118 4119 tree 4120 mangle_thunk (tree fn_decl, const int this_adjusting, tree fixed_offset, 4121 tree virtual_offset, tree thunk) 4122 { 4123 tree result; 4124 4125 if (abi_version_at_least (11)) 4126 maybe_check_abi_tags (fn_decl, thunk, 11); 4127 4128 start_mangling (fn_decl); 4129 4130 write_string ("_Z"); 4131 write_char ('T'); 4132 4133 if (!this_adjusting) 4134 { 4135 /* Covariant thunk with no this adjustment */ 4136 write_char ('c'); 4137 mangle_call_offset (integer_zero_node, NULL_TREE); 4138 mangle_call_offset (fixed_offset, virtual_offset); 4139 } 4140 else if (!DECL_THUNK_P (fn_decl)) 4141 /* Plain this adjusting thunk. */ 4142 mangle_call_offset (fixed_offset, virtual_offset); 4143 else 4144 { 4145 /* This adjusting thunk to covariant thunk. */ 4146 write_char ('c'); 4147 mangle_call_offset (fixed_offset, virtual_offset); 4148 fixed_offset = ssize_int (THUNK_FIXED_OFFSET (fn_decl)); 4149 virtual_offset = THUNK_VIRTUAL_OFFSET (fn_decl); 4150 if (virtual_offset) 4151 virtual_offset = BINFO_VPTR_FIELD (virtual_offset); 4152 mangle_call_offset (fixed_offset, virtual_offset); 4153 fn_decl = THUNK_TARGET (fn_decl); 4154 } 4155 4156 /* Scoped name. */ 4157 write_encoding (fn_decl); 4158 4159 result = finish_mangling_get_identifier (); 4160 if (DEBUG_MANGLE) 4161 fprintf (stderr, "mangle_thunk = %s\n\n", IDENTIFIER_POINTER (result)); 4162 return result; 4163 } 4164 4165 /* Handle ABI backwards compatibility for past bugs where we didn't call 4166 check_abi_tags in places where it's needed: call check_abi_tags and warn if 4167 it makes a difference. If FOR_DECL is non-null, it's the declaration 4168 that we're actually trying to mangle; if it's null, we're mangling the 4169 guard variable for T. */ 4170 4171 static void 4172 maybe_check_abi_tags (tree t, tree for_decl, int ver) 4173 { 4174 if (DECL_ASSEMBLER_NAME_SET_P (t)) 4175 return; 4176 4177 tree oldtags = get_abi_tags (t); 4178 4179 mangle_decl (t); 4180 4181 tree newtags = get_abi_tags (t); 4182 if (newtags && newtags != oldtags 4183 && abi_version_crosses (ver)) 4184 { 4185 if (for_decl && DECL_THUNK_P (for_decl)) 4186 warning_at (DECL_SOURCE_LOCATION (t), OPT_Wabi, 4187 "the mangled name of a thunk for %qD changes between " 4188 "-fabi-version=%d and -fabi-version=%d", 4189 t, flag_abi_version, warn_abi_version); 4190 else if (for_decl) 4191 warning_at (DECL_SOURCE_LOCATION (for_decl), OPT_Wabi, 4192 "the mangled name of %qD changes between " 4193 "-fabi-version=%d and -fabi-version=%d", 4194 for_decl, flag_abi_version, warn_abi_version); 4195 else 4196 warning_at (DECL_SOURCE_LOCATION (t), OPT_Wabi, 4197 "the mangled name of the initialization guard variable " 4198 "for %qD changes between -fabi-version=%d and " 4199 "-fabi-version=%d", 4200 t, flag_abi_version, warn_abi_version); 4201 } 4202 } 4203 4204 /* Write out the appropriate string for this variable when generating 4205 another mangled name based on this one. */ 4206 4207 static void 4208 write_guarded_var_name (const tree variable) 4209 { 4210 if (DECL_NAME (variable) 4211 && strncmp (IDENTIFIER_POINTER (DECL_NAME (variable)), "_ZGR", 4) == 0) 4212 /* The name of a guard variable for a reference temporary should refer 4213 to the reference, not the temporary. */ 4214 write_string (IDENTIFIER_POINTER (DECL_NAME (variable)) + 4); 4215 else 4216 write_name (variable, /*ignore_local_scope=*/0); 4217 } 4218 4219 /* Return an identifier for the name of an initialization guard 4220 variable for indicated VARIABLE. */ 4221 4222 tree 4223 mangle_guard_variable (const tree variable) 4224 { 4225 if (abi_version_at_least (10)) 4226 maybe_check_abi_tags (variable); 4227 start_mangling (variable); 4228 write_string ("_ZGV"); 4229 write_guarded_var_name (variable); 4230 return finish_mangling_get_identifier (); 4231 } 4232 4233 /* Return an identifier for the name of a thread_local initialization 4234 function for VARIABLE. */ 4235 4236 tree 4237 mangle_tls_init_fn (const tree variable) 4238 { 4239 check_abi_tags (variable); 4240 start_mangling (variable); 4241 write_string ("_ZTH"); 4242 write_guarded_var_name (variable); 4243 return finish_mangling_get_identifier (); 4244 } 4245 4246 /* Return an identifier for the name of a thread_local wrapper 4247 function for VARIABLE. */ 4248 4249 #define TLS_WRAPPER_PREFIX "_ZTW" 4250 4251 tree 4252 mangle_tls_wrapper_fn (const tree variable) 4253 { 4254 check_abi_tags (variable); 4255 start_mangling (variable); 4256 write_string (TLS_WRAPPER_PREFIX); 4257 write_guarded_var_name (variable); 4258 return finish_mangling_get_identifier (); 4259 } 4260 4261 /* Return true iff FN is a thread_local wrapper function. */ 4262 4263 bool 4264 decl_tls_wrapper_p (const tree fn) 4265 { 4266 if (TREE_CODE (fn) != FUNCTION_DECL) 4267 return false; 4268 tree name = DECL_NAME (fn); 4269 return strncmp (IDENTIFIER_POINTER (name), TLS_WRAPPER_PREFIX, 4270 strlen (TLS_WRAPPER_PREFIX)) == 0; 4271 } 4272 4273 /* Return an identifier for the name of a temporary variable used to 4274 initialize a static reference. This isn't part of the ABI, but we might 4275 as well call them something readable. */ 4276 4277 static GTY(()) int temp_count; 4278 4279 tree 4280 mangle_ref_init_variable (const tree variable) 4281 { 4282 start_mangling (variable); 4283 write_string ("_ZGR"); 4284 check_abi_tags (variable); 4285 write_name (variable, /*ignore_local_scope=*/0); 4286 /* Avoid name clashes with aggregate initialization of multiple 4287 references at once. */ 4288 write_unsigned_number (temp_count++); 4289 return finish_mangling_get_identifier (); 4290 } 4291 4292 /* Given a CLASS_TYPE, such as a record for std::bad_exception this 4293 function generates a mangled name for the vtable map variable of 4294 the class type. For example, if the class type is 4295 "std::bad_exception", the mangled name for the class is 4296 "St13bad_exception". This function would generate the name 4297 "_ZN4_VTVISt13bad_exceptionE12__vtable_mapE", which unmangles as: 4298 "_VTV<std::bad_exception>::__vtable_map". */ 4299 4300 4301 char * 4302 get_mangled_vtable_map_var_name (tree class_type) 4303 { 4304 char *var_name = NULL; 4305 const char *prefix = "_ZN4_VTVI"; 4306 const char *postfix = "E12__vtable_mapE"; 4307 4308 gcc_assert (TREE_CODE (class_type) == RECORD_TYPE); 4309 4310 tree class_id = DECL_ASSEMBLER_NAME (TYPE_NAME (class_type)); 4311 4312 if (strstr (IDENTIFIER_POINTER (class_id), "<anon>") != NULL) 4313 { 4314 class_id = get_mangled_id (TYPE_NAME (class_type)); 4315 vtbl_register_mangled_name (TYPE_NAME (class_type), class_id); 4316 } 4317 4318 unsigned int len = strlen (IDENTIFIER_POINTER (class_id)) + 4319 strlen (prefix) + 4320 strlen (postfix) + 1; 4321 4322 var_name = (char *) xmalloc (len); 4323 4324 sprintf (var_name, "%s%s%s", prefix, IDENTIFIER_POINTER (class_id), postfix); 4325 4326 return var_name; 4327 } 4328 4329 #include "gt-cp-mangle.h" 4330