679 lines
20 KiB
C
679 lines
20 KiB
C
/* Go language support routines for GDB, the GNU debugger.
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Copyright (C) 2012-2018 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* TODO:
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- split stacks
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- printing of native types
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- goroutines
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- lots more
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- gccgo mangling needs redoing
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It's too hard, for example, to know whether one is looking at a mangled
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Go symbol or not, and their are ambiguities, e.g., the demangler may
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get passed *any* symbol, including symbols from other languages
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and including symbols that are already demangled.
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One thought is to at least add an _G prefix.
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- 6g mangling isn't supported yet
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*/
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#include "defs.h"
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#include "gdb_obstack.h"
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#include "block.h"
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#include "symtab.h"
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#include "language.h"
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#include "varobj.h"
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#include "go-lang.h"
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#include "c-lang.h"
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#include "parser-defs.h"
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#include <ctype.h>
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/* The main function in the main package. */
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static const char GO_MAIN_MAIN[] = "main.main";
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/* Function returning the special symbol name used by Go for the main
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procedure in the main program if it is found in minimal symbol list.
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This function tries to find minimal symbols so that it finds them even
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if the program was compiled without debugging information. */
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const char *
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go_main_name (void)
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{
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struct bound_minimal_symbol msym;
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msym = lookup_minimal_symbol (GO_MAIN_MAIN, NULL, NULL);
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if (msym.minsym != NULL)
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return GO_MAIN_MAIN;
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/* No known entry procedure found, the main program is probably not Go. */
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return NULL;
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}
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/* Return non-zero if TYPE is a gccgo string.
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We assume CHECK_TYPEDEF has already been done. */
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static int
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gccgo_string_p (struct type *type)
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{
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/* gccgo strings don't necessarily have a name we can use. */
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if (TYPE_NFIELDS (type) == 2)
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{
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struct type *type0 = TYPE_FIELD_TYPE (type, 0);
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struct type *type1 = TYPE_FIELD_TYPE (type, 1);
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type0 = check_typedef (type0);
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type1 = check_typedef (type1);
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if (TYPE_CODE (type0) == TYPE_CODE_PTR
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&& strcmp (TYPE_FIELD_NAME (type, 0), "__data") == 0
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&& TYPE_CODE (type1) == TYPE_CODE_INT
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&& strcmp (TYPE_FIELD_NAME (type, 1), "__length") == 0)
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{
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struct type *target_type = TYPE_TARGET_TYPE (type0);
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target_type = check_typedef (target_type);
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if (TYPE_CODE (target_type) == TYPE_CODE_INT
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&& TYPE_LENGTH (target_type) == 1
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&& strcmp (TYPE_NAME (target_type), "uint8") == 0)
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return 1;
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}
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}
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return 0;
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}
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/* Return non-zero if TYPE is a 6g string.
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We assume CHECK_TYPEDEF has already been done. */
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static int
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sixg_string_p (struct type *type)
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{
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if (TYPE_NFIELDS (type) == 2
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&& TYPE_TAG_NAME (type) != NULL
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&& strcmp (TYPE_TAG_NAME (type), "string") == 0)
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return 1;
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return 0;
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}
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/* Classify the kind of Go object that TYPE is.
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TYPE is a TYPE_CODE_STRUCT, used to represent a Go object. */
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enum go_type
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go_classify_struct_type (struct type *type)
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{
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type = check_typedef (type);
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/* Recognize strings as they're useful to be able to print without
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pretty-printers. */
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if (gccgo_string_p (type)
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|| sixg_string_p (type))
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return GO_TYPE_STRING;
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return GO_TYPE_NONE;
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}
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/* Subroutine of unpack_mangled_go_symbol to simplify it.
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Given "[foo.]bar.baz", store "bar" in *PACKAGEP and "baz" in *OBJECTP.
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We stomp on the last '.' to nul-terminate "bar".
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The caller is responsible for memory management. */
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static void
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unpack_package_and_object (char *buf,
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const char **packagep, const char **objectp)
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{
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char *last_dot;
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last_dot = strrchr (buf, '.');
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gdb_assert (last_dot != NULL);
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*objectp = last_dot + 1;
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*last_dot = '\0';
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last_dot = strrchr (buf, '.');
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if (last_dot != NULL)
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*packagep = last_dot + 1;
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else
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*packagep = buf;
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}
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/* Given a mangled Go symbol, find its package name, object name, and
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method type (if present).
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E.g., for "libgo_net.textproto.String.N33_libgo_net.textproto.ProtocolError"
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*PACKAGEP = "textproto"
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*OBJECTP = "String"
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*METHOD_TYPE_PACKAGEP = "textproto"
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*METHOD_TYPE_OBJECTP = "ProtocolError"
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Space for the resulting strings is malloc'd in one buffer.
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PACKAGEP,OBJECTP,METHOD_TYPE* will (typically) point into this buffer.
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[There are a few exceptions, but the caller is still responsible for
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freeing the resulting pointer.]
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A pointer to this buffer is returned, or NULL if symbol isn't a
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mangled Go symbol.
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The caller is responsible for freeing the result.
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*METHOD_TYPE_IS_POINTERP is set to a boolean indicating if
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the method type is a pointer.
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There may be value in returning the outer container,
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i.e., "net" in the above example, but for now it's not needed.
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Plus it's currently not straightforward to compute,
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it comes from -fgo-prefix, and there's no algorithm to compute it.
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If we ever need to unpack the method type, this routine should work
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for that too. */
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static char *
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unpack_mangled_go_symbol (const char *mangled_name,
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const char **packagep,
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const char **objectp,
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const char **method_type_packagep,
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const char **method_type_objectp,
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int *method_type_is_pointerp)
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{
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char *buf;
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char *p;
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int len = strlen (mangled_name);
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/* Pointer to last digit in "N<digit(s)>_". */
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char *saw_digit;
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/* Pointer to "N" if valid "N<digit(s)>_" found. */
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char *method_type;
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/* Pointer to the first '.'. */
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const char *first_dot;
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/* Pointer to the last '.'. */
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const char *last_dot;
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/* Non-zero if we saw a pointer indicator. */
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int saw_pointer;
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*packagep = *objectp = NULL;
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*method_type_packagep = *method_type_objectp = NULL;
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*method_type_is_pointerp = 0;
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/* main.init is mangled specially. */
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if (strcmp (mangled_name, "__go_init_main") == 0)
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{
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char *package = xstrdup ("main");
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*packagep = package;
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*objectp = "init";
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return package;
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}
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/* main.main is mangled specially (missing prefix). */
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if (strcmp (mangled_name, "main.main") == 0)
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{
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char *package = xstrdup ("main");
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*packagep = package;
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*objectp = "main";
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return package;
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}
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/* We may get passed, e.g., "main.T.Foo", which is *not* mangled.
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Alas it looks exactly like "prefix.package.object."
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To cope for now we only recognize the following prefixes:
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go: the default
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libgo_.*: used by gccgo's runtime
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Thus we don't support -fgo-prefix (except as used by the runtime). */
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if (!startswith (mangled_name, "go.")
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&& !startswith (mangled_name, "libgo_"))
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return NULL;
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/* Quick check for whether a search may be fruitful. */
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/* Ignore anything with @plt, etc. in it. */
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if (strchr (mangled_name, '@') != NULL)
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return NULL;
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/* It must have at least two dots. */
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first_dot = strchr (mangled_name, '.');
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if (first_dot == NULL)
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return NULL;
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/* Treat "foo.bar" as unmangled. It can collide with lots of other
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languages and it's not clear what the consequences are.
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And except for main.main, all gccgo symbols are at least
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prefix.package.object. */
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last_dot = strrchr (mangled_name, '.');
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if (last_dot == first_dot)
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return NULL;
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/* More quick checks. */
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if (last_dot[1] == '\0' /* foo. */
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|| last_dot[-1] == '.') /* foo..bar */
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return NULL;
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/* At this point we've decided we have a mangled Go symbol. */
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buf = xstrdup (mangled_name);
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/* Search backwards looking for "N<digit(s)>". */
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p = buf + len;
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saw_digit = method_type = NULL;
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saw_pointer = 0;
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while (p > buf)
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{
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int current = *(const unsigned char *) --p;
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int current_is_digit = isdigit (current);
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if (saw_digit)
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{
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if (current_is_digit)
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continue;
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if (current == 'N'
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&& ((p > buf && p[-1] == '.')
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|| (p > buf + 1 && p[-1] == 'p' && p[-2] == '.')))
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{
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if (atoi (p + 1) == strlen (saw_digit + 2))
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{
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if (p[-1] == '.')
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method_type = p - 1;
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else
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{
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gdb_assert (p[-1] == 'p');
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saw_pointer = 1;
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method_type = p - 2;
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}
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break;
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}
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}
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/* Not what we're looking for, reset and keep looking. */
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saw_digit = NULL;
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saw_pointer = 0;
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continue;
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}
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if (current_is_digit && p[1] == '_')
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{
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/* Possible start of method "this" [sic] type. */
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saw_digit = p;
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continue;
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}
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}
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if (method_type != NULL
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/* Ensure not something like "..foo". */
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&& (method_type > buf && method_type[-1] != '.'))
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{
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unpack_package_and_object (saw_digit + 2,
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method_type_packagep, method_type_objectp);
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*method_type = '\0';
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*method_type_is_pointerp = saw_pointer;
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}
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unpack_package_and_object (buf, packagep, objectp);
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return buf;
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}
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/* Implements the la_demangle language_defn routine for language Go.
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N.B. This may get passed *any* symbol, including symbols from other
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languages and including symbols that are already demangled.
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Both of these situations are kinda unfortunate, but that's how things
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are today.
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N.B. This currently only supports gccgo's mangling.
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N.B. gccgo's mangling needs, I think, changing.
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This demangler can't work in all situations,
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thus not too much effort is currently put into it. */
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char *
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go_demangle (const char *mangled_name, int options)
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{
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struct obstack tempbuf;
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char *result;
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char *name_buf;
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const char *package_name;
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const char *object_name;
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const char *method_type_package_name;
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const char *method_type_object_name;
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int method_type_is_pointer;
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if (mangled_name == NULL)
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return NULL;
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name_buf = unpack_mangled_go_symbol (mangled_name,
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&package_name, &object_name,
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&method_type_package_name,
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&method_type_object_name,
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&method_type_is_pointer);
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if (name_buf == NULL)
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return NULL;
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obstack_init (&tempbuf);
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/* Print methods as they appear in "method expressions". */
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if (method_type_package_name != NULL)
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{
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/* FIXME: Seems like we should include package_name here somewhere. */
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if (method_type_is_pointer)
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obstack_grow_str (&tempbuf, "(*");
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obstack_grow_str (&tempbuf, method_type_package_name);
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obstack_grow_str (&tempbuf, ".");
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obstack_grow_str (&tempbuf, method_type_object_name);
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if (method_type_is_pointer)
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obstack_grow_str (&tempbuf, ")");
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obstack_grow_str (&tempbuf, ".");
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obstack_grow_str (&tempbuf, object_name);
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}
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else
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{
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obstack_grow_str (&tempbuf, package_name);
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obstack_grow_str (&tempbuf, ".");
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obstack_grow_str (&tempbuf, object_name);
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}
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obstack_grow_str0 (&tempbuf, "");
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result = xstrdup ((const char *) obstack_finish (&tempbuf));
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obstack_free (&tempbuf, NULL);
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xfree (name_buf);
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return result;
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}
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/* la_sniff_from_mangled_name for Go. */
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static int
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go_sniff_from_mangled_name (const char *mangled, char **demangled)
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{
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*demangled = go_demangle (mangled, 0);
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return *demangled != NULL;
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}
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/* Given a Go symbol, return its package or NULL if unknown.
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Space for the result is malloc'd, caller must free. */
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char *
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go_symbol_package_name (const struct symbol *sym)
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{
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const char *mangled_name = SYMBOL_LINKAGE_NAME (sym);
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const char *package_name;
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const char *object_name;
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const char *method_type_package_name;
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const char *method_type_object_name;
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int method_type_is_pointer;
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char *name_buf;
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char *result;
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gdb_assert (SYMBOL_LANGUAGE (sym) == language_go);
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name_buf = unpack_mangled_go_symbol (mangled_name,
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&package_name, &object_name,
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&method_type_package_name,
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&method_type_object_name,
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&method_type_is_pointer);
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/* Some Go symbols don't have mangled form we interpret (yet). */
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if (name_buf == NULL)
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return NULL;
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result = xstrdup (package_name);
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xfree (name_buf);
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return result;
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}
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/* Return the package that BLOCK is in, or NULL if there isn't one.
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Space for the result is malloc'd, caller must free. */
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char *
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go_block_package_name (const struct block *block)
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{
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while (block != NULL)
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{
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struct symbol *function = BLOCK_FUNCTION (block);
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if (function != NULL)
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{
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char *package_name = go_symbol_package_name (function);
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if (package_name != NULL)
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return package_name;
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/* Stop looking if we find a function without a package name.
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We're most likely outside of Go and thus the concept of the
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"current" package is gone. */
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return NULL;
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}
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block = BLOCK_SUPERBLOCK (block);
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}
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return NULL;
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}
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/* Table mapping opcodes into strings for printing operators
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and precedences of the operators.
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TODO(dje): &^ ? */
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static const struct op_print go_op_print_tab[] =
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{
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{",", BINOP_COMMA, PREC_COMMA, 0},
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{"=", BINOP_ASSIGN, PREC_ASSIGN, 1},
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{"||", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0},
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{"&&", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0},
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{"|", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0},
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{"^", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0},
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{"&", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0},
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{"==", BINOP_EQUAL, PREC_EQUAL, 0},
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{"!=", BINOP_NOTEQUAL, PREC_EQUAL, 0},
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{"<=", BINOP_LEQ, PREC_ORDER, 0},
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{">=", BINOP_GEQ, PREC_ORDER, 0},
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{">", BINOP_GTR, PREC_ORDER, 0},
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{"<", BINOP_LESS, PREC_ORDER, 0},
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{">>", BINOP_RSH, PREC_SHIFT, 0},
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{"<<", BINOP_LSH, PREC_SHIFT, 0},
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{"+", BINOP_ADD, PREC_ADD, 0},
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{"-", BINOP_SUB, PREC_ADD, 0},
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{"*", BINOP_MUL, PREC_MUL, 0},
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{"/", BINOP_DIV, PREC_MUL, 0},
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{"%", BINOP_REM, PREC_MUL, 0},
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{"@", BINOP_REPEAT, PREC_REPEAT, 0},
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{"-", UNOP_NEG, PREC_PREFIX, 0},
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{"!", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
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{"^", UNOP_COMPLEMENT, PREC_PREFIX, 0},
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{"*", UNOP_IND, PREC_PREFIX, 0},
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{"&", UNOP_ADDR, PREC_PREFIX, 0},
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{"unsafe.Sizeof ", UNOP_SIZEOF, PREC_PREFIX, 0},
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{"++", UNOP_POSTINCREMENT, PREC_SUFFIX, 0},
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{"--", UNOP_POSTDECREMENT, PREC_SUFFIX, 0},
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{NULL, OP_NULL, PREC_SUFFIX, 0}
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};
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enum go_primitive_types {
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go_primitive_type_void,
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go_primitive_type_char,
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go_primitive_type_bool,
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go_primitive_type_int,
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go_primitive_type_uint,
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go_primitive_type_uintptr,
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go_primitive_type_int8,
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go_primitive_type_int16,
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go_primitive_type_int32,
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go_primitive_type_int64,
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go_primitive_type_uint8,
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go_primitive_type_uint16,
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go_primitive_type_uint32,
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go_primitive_type_uint64,
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go_primitive_type_float32,
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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;
|
|
}
|
|
|
|
extern const struct language_defn go_language_defn =
|
|
{
|
|
"go",
|
|
"Go",
|
|
language_go,
|
|
range_check_off,
|
|
case_sensitive_on,
|
|
array_row_major,
|
|
macro_expansion_no,
|
|
NULL,
|
|
&exp_descriptor_c,
|
|
go_parse,
|
|
go_yyerror,
|
|
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. */
|
|
go_sniff_from_mangled_name,
|
|
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_collect_symbol_completion_matches,
|
|
go_language_arch_info,
|
|
default_print_array_index,
|
|
default_pass_by_reference,
|
|
c_get_string,
|
|
c_watch_location_expression,
|
|
NULL, /* la_get_symbol_name_matcher */
|
|
iterate_over_symbols,
|
|
default_search_name_hash,
|
|
&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, TARGET_CHAR_BIT, "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", floatformats_ieee_single);
|
|
builtin_go_type->builtin_float64
|
|
= arch_float_type (gdbarch, 64, "float64", floatformats_ieee_double);
|
|
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);
|
|
}
|
|
|
|
void
|
|
_initialize_go_language (void)
|
|
{
|
|
go_type_data = gdbarch_data_register_post_init (build_go_types);
|
|
}
|