1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669
|
/* Go language support routines for GDB, the GNU debugger.
Copyright (C) 2012-2015 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* TODO:
- split stacks
- printing of native types
- goroutines
- lots more
- gccgo mangling needs redoing
It's too hard, for example, to know whether one is looking at a mangled
Go symbol or not, and their are ambiguities, e.g., the demangler may
get passed *any* symbol, including symbols from other languages
and including symbols that are already demangled.
One thought is to at least add an _G prefix.
- 6g mangling isn't supported yet
*/
#include "defs.h"
#include "gdb_obstack.h"
#include "block.h"
#include "symtab.h"
#include "language.h"
#include "varobj.h"
#include "go-lang.h"
#include "c-lang.h"
#include "parser-defs.h"
#include <ctype.h>
/* The main function in the main package. */
static const char GO_MAIN_MAIN[] = "main.main";
/* Function returning the special symbol name used by Go for the main
procedure in the main program if it is found in minimal symbol list.
This function tries to find minimal symbols so that it finds them even
if the program was compiled without debugging information. */
const char *
go_main_name (void)
{
struct bound_minimal_symbol msym;
msym = lookup_minimal_symbol (GO_MAIN_MAIN, NULL, NULL);
if (msym.minsym != NULL)
return GO_MAIN_MAIN;
/* No known entry procedure found, the main program is probably not Go. */
return NULL;
}
/* Return non-zero if TYPE is a gccgo string.
We assume CHECK_TYPEDEF has already been done. */
static int
gccgo_string_p (struct type *type)
{
/* gccgo strings don't necessarily have a name we can use. */
if (TYPE_NFIELDS (type) == 2)
{
struct type *type0 = TYPE_FIELD_TYPE (type, 0);
struct type *type1 = TYPE_FIELD_TYPE (type, 1);
type0 = check_typedef (type0);
type1 = check_typedef (type1);
if (TYPE_CODE (type0) == TYPE_CODE_PTR
&& strcmp (TYPE_FIELD_NAME (type, 0), "__data") == 0
&& TYPE_CODE (type1) == TYPE_CODE_INT
&& strcmp (TYPE_FIELD_NAME (type, 1), "__length") == 0)
{
struct type *target_type = TYPE_TARGET_TYPE (type0);
target_type = check_typedef (target_type);
if (TYPE_CODE (target_type) == TYPE_CODE_INT
&& TYPE_LENGTH (target_type) == 1
&& strcmp (TYPE_NAME (target_type), "uint8") == 0)
return 1;
}
}
return 0;
}
/* Return non-zero if TYPE is a 6g string.
We assume CHECK_TYPEDEF has already been done. */
static int
sixg_string_p (struct type *type)
{
if (TYPE_NFIELDS (type) == 2
&& TYPE_TAG_NAME (type) != NULL
&& strcmp (TYPE_TAG_NAME (type), "string") == 0)
return 1;
return 0;
}
/* Classify the kind of Go object that TYPE is.
TYPE is a TYPE_CODE_STRUCT, used to represent a Go object. */
enum go_type
go_classify_struct_type (struct type *type)
{
type = check_typedef (type);
/* Recognize strings as they're useful to be able to print without
pretty-printers. */
if (gccgo_string_p (type)
|| sixg_string_p (type))
return GO_TYPE_STRING;
return GO_TYPE_NONE;
}
/* Subroutine of unpack_mangled_go_symbol to simplify it.
Given "[foo.]bar.baz", store "bar" in *PACKAGEP and "baz" in *OBJECTP.
We stomp on the last '.' to nul-terminate "bar".
The caller is responsible for memory management. */
static void
unpack_package_and_object (char *buf,
const char **packagep, const char **objectp)
{
char *last_dot;
last_dot = strrchr (buf, '.');
gdb_assert (last_dot != NULL);
*objectp = last_dot + 1;
*last_dot = '\0';
last_dot = strrchr (buf, '.');
if (last_dot != NULL)
*packagep = last_dot + 1;
else
*packagep = buf;
}
/* Given a mangled Go symbol, find its package name, object name, and
method type (if present).
E.g., for "libgo_net.textproto.String.N33_libgo_net.textproto.ProtocolError"
*PACKAGEP = "textproto"
*OBJECTP = "String"
*METHOD_TYPE_PACKAGEP = "textproto"
*METHOD_TYPE_OBJECTP = "ProtocolError"
Space for the resulting strings is malloc'd in one buffer.
PACKAGEP,OBJECTP,METHOD_TYPE* will (typically) point into this buffer.
[There are a few exceptions, but the caller is still responsible for
freeing the resulting pointer.]
A pointer to this buffer is returned, or NULL if symbol isn't a
mangled Go symbol.
The caller is responsible for freeing the result.
*METHOD_TYPE_IS_POINTERP is set to a boolean indicating if
the method type is a pointer.
There may be value in returning the outer container,
i.e., "net" in the above example, but for now it's not needed.
Plus it's currently not straightforward to compute,
it comes from -fgo-prefix, and there's no algorithm to compute it.
If we ever need to unpack the method type, this routine should work
for that too. */
static char *
unpack_mangled_go_symbol (const char *mangled_name,
const char **packagep,
const char **objectp,
const char **method_type_packagep,
const char **method_type_objectp,
int *method_type_is_pointerp)
{
char *buf;
char *p;
int len = strlen (mangled_name);
/* Pointer to last digit in "N<digit(s)>_". */
char *saw_digit;
/* Pointer to "N" if valid "N<digit(s)>_" found. */
char *method_type;
/* Pointer to the first '.'. */
const char *first_dot;
/* Pointer to the last '.'. */
const char *last_dot;
/* Non-zero if we saw a pointer indicator. */
int saw_pointer;
*packagep = *objectp = NULL;
*method_type_packagep = *method_type_objectp = NULL;
*method_type_is_pointerp = 0;
/* main.init is mangled specially. */
if (strcmp (mangled_name, "__go_init_main") == 0)
{
char *package = xstrdup ("main");
*packagep = package;
*objectp = "init";
return package;
}
/* main.main is mangled specially (missing prefix). */
if (strcmp (mangled_name, "main.main") == 0)
{
char *package = xstrdup ("main");
*packagep = package;
*objectp = "main";
return package;
}
/* We may get passed, e.g., "main.T.Foo", which is *not* mangled.
Alas it looks exactly like "prefix.package.object."
To cope for now we only recognize the following prefixes:
go: the default
libgo_.*: used by gccgo's runtime
Thus we don't support -fgo-prefix (except as used by the runtime). */
if (!startswith (mangled_name, "go.")
&& !startswith (mangled_name, "libgo_"))
return NULL;
/* Quick check for whether a search may be fruitful. */
/* Ignore anything with @plt, etc. in it. */
if (strchr (mangled_name, '@') != NULL)
return NULL;
/* It must have at least two dots. */
first_dot = strchr (mangled_name, '.');
if (first_dot == NULL)
return NULL;
/* Treat "foo.bar" as unmangled. It can collide with lots of other
languages and it's not clear what the consequences are.
And except for main.main, all gccgo symbols are at least
prefix.package.object. */
last_dot = strrchr (mangled_name, '.');
if (last_dot == first_dot)
return NULL;
/* More quick checks. */
if (last_dot[1] == '\0' /* foo. */
|| last_dot[-1] == '.') /* foo..bar */
return NULL;
/* At this point we've decided we have a mangled Go symbol. */
buf = xstrdup (mangled_name);
/* Search backwards looking for "N<digit(s)>". */
p = buf + len;
saw_digit = method_type = NULL;
saw_pointer = 0;
while (p > buf)
{
int current = *(const unsigned char *) --p;
int current_is_digit = isdigit (current);
if (saw_digit)
{
if (current_is_digit)
continue;
if (current == 'N'
&& ((p > buf && p[-1] == '.')
|| (p > buf + 1 && p[-1] == 'p' && p[-2] == '.')))
{
if (atoi (p + 1) == strlen (saw_digit + 2))
{
if (p[-1] == '.')
method_type = p - 1;
else
{
gdb_assert (p[-1] == 'p');
saw_pointer = 1;
method_type = p - 2;
}
break;
}
}
/* Not what we're looking for, reset and keep looking. */
saw_digit = NULL;
saw_pointer = 0;
continue;
}
if (current_is_digit && p[1] == '_')
{
/* Possible start of method "this" [sic] type. */
saw_digit = p;
continue;
}
}
if (method_type != NULL
/* Ensure not something like "..foo". */
&& (method_type > buf && method_type[-1] != '.'))
{
unpack_package_and_object (saw_digit + 2,
method_type_packagep, method_type_objectp);
*method_type = '\0';
*method_type_is_pointerp = saw_pointer;
}
unpack_package_and_object (buf, packagep, objectp);
return buf;
}
/* Implements the la_demangle language_defn routine for language Go.
N.B. This may get passed *any* symbol, including symbols from other
languages and including symbols that are already demangled.
Both of these situations are kinda unfortunate, but that's how things
are today.
N.B. This currently only supports gccgo's mangling.
N.B. gccgo's mangling needs, I think, changing.
This demangler can't work in all situations,
thus not too much effort is currently put into it. */
char *
go_demangle (const char *mangled_name, int options)
{
struct obstack tempbuf;
char *result;
char *name_buf;
const char *package_name;
const char *object_name;
const char *method_type_package_name;
const char *method_type_object_name;
int method_type_is_pointer;
if (mangled_name == NULL)
return NULL;
name_buf = unpack_mangled_go_symbol (mangled_name,
&package_name, &object_name,
&method_type_package_name,
&method_type_object_name,
&method_type_is_pointer);
if (name_buf == NULL)
return NULL;
obstack_init (&tempbuf);
/* Print methods as they appear in "method expressions". */
if (method_type_package_name != NULL)
{
/* FIXME: Seems like we should include package_name here somewhere. */
if (method_type_is_pointer)
obstack_grow_str (&tempbuf, "(*");
obstack_grow_str (&tempbuf, method_type_package_name);
obstack_grow_str (&tempbuf, ".");
obstack_grow_str (&tempbuf, method_type_object_name);
if (method_type_is_pointer)
obstack_grow_str (&tempbuf, ")");
obstack_grow_str (&tempbuf, ".");
obstack_grow_str (&tempbuf, object_name);
}
else
{
obstack_grow_str (&tempbuf, package_name);
obstack_grow_str (&tempbuf, ".");
obstack_grow_str (&tempbuf, object_name);
}
obstack_grow_str0 (&tempbuf, "");
result = xstrdup ((const char *) obstack_finish (&tempbuf));
obstack_free (&tempbuf, NULL);
xfree (name_buf);
return result;
}
/* Given a Go symbol, return its package or NULL if unknown.
Space for the result is malloc'd, caller must free. */
char *
go_symbol_package_name (const struct symbol *sym)
{
const char *mangled_name = SYMBOL_LINKAGE_NAME (sym);
const char *package_name;
const char *object_name;
const char *method_type_package_name;
const char *method_type_object_name;
int method_type_is_pointer;
char *name_buf;
char *result;
gdb_assert (SYMBOL_LANGUAGE (sym) == language_go);
name_buf = unpack_mangled_go_symbol (mangled_name,
&package_name, &object_name,
&method_type_package_name,
&method_type_object_name,
&method_type_is_pointer);
/* Some Go symbols don't have mangled form we interpret (yet). */
if (name_buf == NULL)
return NULL;
result = xstrdup (package_name);
xfree (name_buf);
return result;
}
/* Return the package that BLOCK is in, or NULL if there isn't one.
Space for the result is malloc'd, caller must free. */
char *
go_block_package_name (const struct block *block)
{
while (block != NULL)
{
struct symbol *function = BLOCK_FUNCTION (block);
if (function != NULL)
{
char *package_name = go_symbol_package_name (function);
if (package_name != NULL)
return package_name;
/* Stop looking if we find a function without a package name.
We're most likely outside of Go and thus the concept of the
"current" package is gone. */
return NULL;
}
block = BLOCK_SUPERBLOCK (block);
}
return NULL;
}
/* Table mapping opcodes into strings for printing operators
and precedences of the operators.
TODO(dje): &^ ? */
static const struct op_print go_op_print_tab[] =
{
{",", BINOP_COMMA, PREC_COMMA, 0},
{"=", BINOP_ASSIGN, PREC_ASSIGN, 1},
{"||", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0},
{"&&", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0},
{"|", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0},
{"^", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0},
{"&", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0},
{"==", BINOP_EQUAL, PREC_EQUAL, 0},
{"!=", BINOP_NOTEQUAL, PREC_EQUAL, 0},
{"<=", BINOP_LEQ, PREC_ORDER, 0},
{">=", BINOP_GEQ, PREC_ORDER, 0},
{">", BINOP_GTR, PREC_ORDER, 0},
{"<", BINOP_LESS, PREC_ORDER, 0},
{">>", BINOP_RSH, PREC_SHIFT, 0},
{"<<", BINOP_LSH, PREC_SHIFT, 0},
{"+", BINOP_ADD, PREC_ADD, 0},
{"-", BINOP_SUB, PREC_ADD, 0},
{"*", BINOP_MUL, PREC_MUL, 0},
{"/", BINOP_DIV, PREC_MUL, 0},
{"%", BINOP_REM, PREC_MUL, 0},
{"@", BINOP_REPEAT, PREC_REPEAT, 0},
{"-", UNOP_NEG, PREC_PREFIX, 0},
{"!", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
{"^", UNOP_COMPLEMENT, PREC_PREFIX, 0},
{"*", UNOP_IND, PREC_PREFIX, 0},
{"&", UNOP_ADDR, PREC_PREFIX, 0},
{"unsafe.Sizeof ", UNOP_SIZEOF, PREC_PREFIX, 0},
{"++", UNOP_POSTINCREMENT, PREC_SUFFIX, 0},
{"--", UNOP_POSTDECREMENT, PREC_SUFFIX, 0},
{NULL, OP_NULL, PREC_SUFFIX, 0}
};
enum go_primitive_types {
go_primitive_type_void,
go_primitive_type_char,
go_primitive_type_bool,
go_primitive_type_int,
go_primitive_type_uint,
go_primitive_type_uintptr,
go_primitive_type_int8,
go_primitive_type_int16,
go_primitive_type_int32,
go_primitive_type_int64,
go_primitive_type_uint8,
go_primitive_type_uint16,
go_primitive_type_uint32,
go_primitive_type_uint64,
go_primitive_type_float32,
go_primitive_type_float64,
go_primitive_type_complex64,
go_primitive_type_complex128,
nr_go_primitive_types
};
static void
go_language_arch_info (struct gdbarch *gdbarch,
struct language_arch_info *lai)
{
const struct builtin_go_type *builtin = builtin_go_type (gdbarch);
lai->string_char_type = builtin->builtin_char;
lai->primitive_type_vector
= GDBARCH_OBSTACK_CALLOC (gdbarch, nr_go_primitive_types + 1,
struct type *);
lai->primitive_type_vector [go_primitive_type_void]
= builtin->builtin_void;
lai->primitive_type_vector [go_primitive_type_char]
= builtin->builtin_char;
lai->primitive_type_vector [go_primitive_type_bool]
= builtin->builtin_bool;
lai->primitive_type_vector [go_primitive_type_int]
= builtin->builtin_int;
lai->primitive_type_vector [go_primitive_type_uint]
= builtin->builtin_uint;
lai->primitive_type_vector [go_primitive_type_uintptr]
= builtin->builtin_uintptr;
lai->primitive_type_vector [go_primitive_type_int8]
= builtin->builtin_int8;
lai->primitive_type_vector [go_primitive_type_int16]
= builtin->builtin_int16;
lai->primitive_type_vector [go_primitive_type_int32]
= builtin->builtin_int32;
lai->primitive_type_vector [go_primitive_type_int64]
= builtin->builtin_int64;
lai->primitive_type_vector [go_primitive_type_uint8]
= builtin->builtin_uint8;
lai->primitive_type_vector [go_primitive_type_uint16]
= builtin->builtin_uint16;
lai->primitive_type_vector [go_primitive_type_uint32]
= builtin->builtin_uint32;
lai->primitive_type_vector [go_primitive_type_uint64]
= builtin->builtin_uint64;
lai->primitive_type_vector [go_primitive_type_float32]
= builtin->builtin_float32;
lai->primitive_type_vector [go_primitive_type_float64]
= builtin->builtin_float64;
lai->primitive_type_vector [go_primitive_type_complex64]
= builtin->builtin_complex64;
lai->primitive_type_vector [go_primitive_type_complex128]
= builtin->builtin_complex128;
lai->bool_type_symbol = "bool";
lai->bool_type_default = builtin->builtin_bool;
}
static const struct language_defn go_language_defn =
{
"go",
"Go",
language_go,
range_check_off,
case_sensitive_on,
array_row_major,
macro_expansion_no,
&exp_descriptor_c,
go_parse,
go_error,
null_post_parser,
c_printchar, /* Print a character constant. */
c_printstr, /* Function to print string constant. */
c_emit_char, /* Print a single char. */
go_print_type, /* Print a type using appropriate syntax. */
c_print_typedef, /* Print a typedef using appropriate
syntax. */
go_val_print, /* Print a value using appropriate syntax. */
c_value_print, /* Print a top-level value. */
default_read_var_value, /* la_read_var_value */
NULL, /* Language specific skip_trampoline. */
NULL, /* name_of_this */
basic_lookup_symbol_nonlocal,
basic_lookup_transparent_type,
go_demangle, /* Language specific symbol demangler. */
NULL, /* Language specific
class_name_from_physname. */
go_op_print_tab, /* Expression operators for printing. */
1, /* C-style arrays. */
0, /* String lower bound. */
default_word_break_characters,
default_make_symbol_completion_list,
go_language_arch_info,
default_print_array_index,
default_pass_by_reference,
c_get_string,
NULL,
iterate_over_symbols,
&default_varobj_ops,
NULL,
NULL,
LANG_MAGIC
};
static void *
build_go_types (struct gdbarch *gdbarch)
{
struct builtin_go_type *builtin_go_type
= GDBARCH_OBSTACK_ZALLOC (gdbarch, struct builtin_go_type);
builtin_go_type->builtin_void
= arch_type (gdbarch, TYPE_CODE_VOID, 1, "void");
builtin_go_type->builtin_char
= arch_character_type (gdbarch, 8, 1, "char");
builtin_go_type->builtin_bool
= arch_boolean_type (gdbarch, 8, 0, "bool");
builtin_go_type->builtin_int
= arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 0, "int");
builtin_go_type->builtin_uint
= arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 1, "uint");
builtin_go_type->builtin_uintptr
= arch_integer_type (gdbarch, gdbarch_ptr_bit (gdbarch), 1, "uintptr");
builtin_go_type->builtin_int8
= arch_integer_type (gdbarch, 8, 0, "int8");
builtin_go_type->builtin_int16
= arch_integer_type (gdbarch, 16, 0, "int16");
builtin_go_type->builtin_int32
= arch_integer_type (gdbarch, 32, 0, "int32");
builtin_go_type->builtin_int64
= arch_integer_type (gdbarch, 64, 0, "int64");
builtin_go_type->builtin_uint8
= arch_integer_type (gdbarch, 8, 1, "uint8");
builtin_go_type->builtin_uint16
= arch_integer_type (gdbarch, 16, 1, "uint16");
builtin_go_type->builtin_uint32
= arch_integer_type (gdbarch, 32, 1, "uint32");
builtin_go_type->builtin_uint64
= arch_integer_type (gdbarch, 64, 1, "uint64");
builtin_go_type->builtin_float32
= arch_float_type (gdbarch, 32, "float32", NULL);
builtin_go_type->builtin_float64
= arch_float_type (gdbarch, 64, "float64", NULL);
builtin_go_type->builtin_complex64
= arch_complex_type (gdbarch, "complex64",
builtin_go_type->builtin_float32);
builtin_go_type->builtin_complex128
= arch_complex_type (gdbarch, "complex128",
builtin_go_type->builtin_float64);
return builtin_go_type;
}
static struct gdbarch_data *go_type_data;
const struct builtin_go_type *
builtin_go_type (struct gdbarch *gdbarch)
{
return (const struct builtin_go_type *) gdbarch_data (gdbarch, go_type_data);
}
extern initialize_file_ftype _initialize_go_language;
void
_initialize_go_language (void)
{
go_type_data = gdbarch_data_register_post_init (build_go_types);
add_language (&go_language_defn);
}
|