/* Objective-C language support routines for GDB, the GNU debugger.
Copyright (C) 2002-2019 Free Software Foundation, Inc.
Contributed by Apple Computer, Inc.
Written by Michael Snyder.
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 . */
#include "defs.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "expression.h"
#include "parser-defs.h"
#include "language.h"
#include "varobj.h"
#include "c-lang.h"
#include "objc-lang.h"
#include "complaints.h"
#include "value.h"
#include "symfile.h"
#include "objfiles.h"
#include "target.h" /* for target_has_execution */
#include "gdbcore.h"
#include "gdbcmd.h"
#include "frame.h"
#include "gdb_regex.h"
#include "regcache.h"
#include "block.h"
#include "infcall.h"
#include "valprint.h"
#include "cli/cli-utils.h"
#include
#include
struct objc_object {
CORE_ADDR isa;
};
struct objc_class {
CORE_ADDR isa;
CORE_ADDR super_class;
CORE_ADDR name;
long version;
long info;
long instance_size;
CORE_ADDR ivars;
CORE_ADDR methods;
CORE_ADDR cache;
CORE_ADDR protocols;
};
struct objc_super {
CORE_ADDR receiver;
CORE_ADDR theclass;
};
struct objc_method {
CORE_ADDR name;
CORE_ADDR types;
CORE_ADDR imp;
};
static const struct objfile_data *objc_objfile_data;
/* Lookup a structure type named "struct NAME", visible in lexical
block BLOCK. If NOERR is nonzero, return zero if NAME is not
suitably defined. */
struct symbol *
lookup_struct_typedef (const char *name, const struct block *block, int noerr)
{
struct symbol *sym;
sym = lookup_symbol (name, block, STRUCT_DOMAIN, 0).symbol;
if (sym == NULL)
{
if (noerr)
return 0;
else
error (_("No struct type named %s."), name);
}
if (TYPE_CODE (SYMBOL_TYPE (sym)) != TYPE_CODE_STRUCT)
{
if (noerr)
return 0;
else
error (_("This context has class, union or enum %s, not a struct."),
name);
}
return sym;
}
CORE_ADDR
lookup_objc_class (struct gdbarch *gdbarch, const char *classname)
{
struct type *char_type = builtin_type (gdbarch)->builtin_char;
struct value * function, *classval;
if (! target_has_execution)
{
/* Can't call into inferior to lookup class. */
return 0;
}
if (lookup_minimal_symbol("objc_lookUpClass", 0, 0).minsym)
function = find_function_in_inferior("objc_lookUpClass", NULL);
else if (lookup_minimal_symbol ("objc_lookup_class", 0, 0).minsym)
function = find_function_in_inferior("objc_lookup_class", NULL);
else
{
complaint (_("no way to lookup Objective-C classes"));
return 0;
}
classval = value_string (classname, strlen (classname) + 1, char_type);
classval = value_coerce_array (classval);
return (CORE_ADDR) value_as_long (call_function_by_hand (function,
NULL,
classval));
}
CORE_ADDR
lookup_child_selector (struct gdbarch *gdbarch, const char *selname)
{
struct type *char_type = builtin_type (gdbarch)->builtin_char;
struct value * function, *selstring;
if (! target_has_execution)
{
/* Can't call into inferior to lookup selector. */
return 0;
}
if (lookup_minimal_symbol("sel_getUid", 0, 0).minsym)
function = find_function_in_inferior("sel_getUid", NULL);
else if (lookup_minimal_symbol ("sel_get_any_uid", 0, 0).minsym)
function = find_function_in_inferior("sel_get_any_uid", NULL);
else
{
complaint (_("no way to lookup Objective-C selectors"));
return 0;
}
selstring = value_coerce_array (value_string (selname,
strlen (selname) + 1,
char_type));
return value_as_long (call_function_by_hand (function, NULL, selstring));
}
struct value *
value_nsstring (struct gdbarch *gdbarch, char *ptr, int len)
{
struct type *char_type = builtin_type (gdbarch)->builtin_char;
struct value *stringValue[3];
struct value *function, *nsstringValue;
struct symbol *sym;
struct type *type;
if (!target_has_execution)
return 0; /* Can't call into inferior to create NSString. */
stringValue[2] = value_string(ptr, len, char_type);
stringValue[2] = value_coerce_array(stringValue[2]);
/* _NSNewStringFromCString replaces "istr" after Lantern2A. */
if (lookup_minimal_symbol("_NSNewStringFromCString", 0, 0).minsym)
{
function = find_function_in_inferior("_NSNewStringFromCString", NULL);
nsstringValue = call_function_by_hand(function, NULL, stringValue[2]);
}
else if (lookup_minimal_symbol("istr", 0, 0).minsym)
{
function = find_function_in_inferior("istr", NULL);
nsstringValue = call_function_by_hand(function, NULL, stringValue[2]);
}
else if (lookup_minimal_symbol("+[NSString stringWithCString:]", 0, 0).minsym)
{
function
= find_function_in_inferior("+[NSString stringWithCString:]", NULL);
type = builtin_type (gdbarch)->builtin_long;
stringValue[0] = value_from_longest
(type, lookup_objc_class (gdbarch, "NSString"));
stringValue[1] = value_from_longest
(type, lookup_child_selector (gdbarch, "stringWithCString:"));
nsstringValue = call_function_by_hand(function, NULL, stringValue);
}
else
error (_("NSString: internal error -- no way to create new NSString"));
sym = lookup_struct_typedef("NSString", 0, 1);
if (sym == NULL)
sym = lookup_struct_typedef("NXString", 0, 1);
if (sym == NULL)
type = builtin_type (gdbarch)->builtin_data_ptr;
else
type = lookup_pointer_type(SYMBOL_TYPE (sym));
deprecated_set_value_type (nsstringValue, type);
return nsstringValue;
}
/* Objective-C name demangling. */
char *
objc_demangle (const char *mangled, int options)
{
char *demangled, *cp;
if (mangled[0] == '_' &&
(mangled[1] == 'i' || mangled[1] == 'c') &&
mangled[2] == '_')
{
cp = demangled = (char *) xmalloc (strlen (mangled) + 2);
if (mangled[1] == 'i')
*cp++ = '-'; /* for instance method */
else
*cp++ = '+'; /* for class method */
*cp++ = '['; /* opening left brace */
strcpy(cp, mangled+3); /* Tack on the rest of the mangled name. */
while (*cp && *cp == '_')
cp++; /* Skip any initial underbars in class
name. */
cp = strchr(cp, '_');
if (!cp) /* Find first non-initial underbar. */
{
xfree(demangled); /* not mangled name */
return NULL;
}
if (cp[1] == '_') /* Easy case: no category name. */
{
*cp++ = ' '; /* Replace two '_' with one ' '. */
strcpy(cp, mangled + (cp - demangled) + 2);
}
else
{
*cp++ = '('; /* Less easy case: category name. */
cp = strchr(cp, '_');
if (!cp)
{
xfree(demangled); /* not mangled name */
return NULL;
}
*cp++ = ')';
*cp++ = ' '; /* Overwriting 1st char of method name... */
strcpy(cp, mangled + (cp - demangled)); /* Get it back. */
}
while (*cp && *cp == '_')
cp++; /* Skip any initial underbars in
method name. */
for (; *cp; cp++)
if (*cp == '_')
*cp = ':'; /* Replace remaining '_' with ':'. */
*cp++ = ']'; /* closing right brace */
*cp++ = 0; /* string terminator */
return demangled;
}
else
return NULL; /* Not an objc mangled name. */
}
/* la_sniff_from_mangled_name for ObjC. */
static int
objc_sniff_from_mangled_name (const char *mangled, char **demangled)
{
*demangled = objc_demangle (mangled, 0);
return *demangled != NULL;
}
/* Determine if we are currently in the Objective-C dispatch function.
If so, get the address of the method function that the dispatcher
would call and use that as the function to step into instead. Also
skip over the trampoline for the function (if any). This is better
for the user since they are only interested in stepping into the
method function anyway. */
static CORE_ADDR
objc_skip_trampoline (struct frame_info *frame, CORE_ADDR stop_pc)
{
struct gdbarch *gdbarch = get_frame_arch (frame);
CORE_ADDR real_stop_pc;
CORE_ADDR method_stop_pc;
real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc);
if (real_stop_pc != 0)
find_objc_msgcall (real_stop_pc, &method_stop_pc);
else
find_objc_msgcall (stop_pc, &method_stop_pc);
if (method_stop_pc)
{
real_stop_pc = gdbarch_skip_trampoline_code
(gdbarch, frame, method_stop_pc);
if (real_stop_pc == 0)
real_stop_pc = method_stop_pc;
}
return real_stop_pc;
}
/* Table mapping opcodes into strings for printing operators
and precedences of the operators. */
static const struct op_print objc_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},
{"sizeof ", UNOP_SIZEOF, PREC_PREFIX, 0},
{"++", UNOP_PREINCREMENT, PREC_PREFIX, 0},
{"--", UNOP_PREDECREMENT, PREC_PREFIX, 0},
{NULL, OP_NULL, PREC_NULL, 0}
};
static const char *objc_extensions[] =
{
".m", NULL
};
extern const struct language_defn objc_language_defn = {
"objective-c", /* Language name */
"Objective-C",
language_objc,
range_check_off,
case_sensitive_on,
array_row_major,
macro_expansion_c,
objc_extensions,
&exp_descriptor_standard,
c_parse,
null_post_parser,
c_printchar, /* Print a character constant */
c_printstr, /* Function to print string constant */
c_emit_char,
c_print_type, /* Print a type using appropriate syntax */
c_print_typedef, /* Print a typedef using appropriate syntax */
c_val_print, /* Print a value using appropriate syntax */
c_value_print, /* Print a top-level value */
default_read_var_value, /* la_read_var_value */
objc_skip_trampoline, /* Language specific skip_trampoline */
"self", /* name_of_this */
false, /* la_store_sym_names_in_linkage_form_p */
basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
basic_lookup_transparent_type,/* lookup_transparent_type */
objc_demangle, /* Language specific symbol demangler */
objc_sniff_from_mangled_name,
NULL, /* Language specific
class_name_from_physname */
objc_op_print_tab, /* Expression operators for printing */
1, /* C-style arrays */
0, /* String lower bound */
default_word_break_characters,
default_collect_symbol_completion_matches,
c_language_arch_info,
default_print_array_index,
default_pass_by_reference,
default_get_string,
c_watch_location_expression,
NULL, /* la_get_symbol_name_matcher */
iterate_over_symbols,
default_search_name_hash,
&default_varobj_ops,
NULL,
NULL,
c_is_string_type_p,
"{...}" /* la_struct_too_deep_ellipsis */
};
/*
* ObjC:
* Following functions help construct Objective-C message calls.
*/
struct selname /* For parsing Objective-C. */
{
struct selname *next;
char *msglist_sel;
int msglist_len;
};
static int msglist_len;
static struct selname *selname_chain;
static char *msglist_sel;
void
start_msglist(void)
{
struct selname *newobj = XNEW (struct selname);
newobj->next = selname_chain;
newobj->msglist_len = msglist_len;
newobj->msglist_sel = msglist_sel;
msglist_len = 0;
msglist_sel = (char *)xmalloc(1);
*msglist_sel = 0;
selname_chain = newobj;
}
void
add_msglist(struct stoken *str, int addcolon)
{
char *s;
const char *p;
int len, plen;
if (str == 0) /* Unnamed arg, or... */
{
if (addcolon == 0) /* variable number of args. */
{
msglist_len++;
return;
}
p = "";
plen = 0;
}
else
{
p = str->ptr;
plen = str->length;
}
len = plen + strlen(msglist_sel) + 2;
s = (char *)xmalloc(len);
strcpy(s, msglist_sel);
strncat(s, p, plen);
xfree(msglist_sel);
msglist_sel = s;
if (addcolon)
{
s[len-2] = ':';
s[len-1] = 0;
msglist_len++;
}
else
s[len-2] = '\0';
}
int
end_msglist (struct parser_state *ps)
{
int val = msglist_len;
struct selname *sel = selname_chain;
char *p = msglist_sel;
CORE_ADDR selid;
selname_chain = sel->next;
msglist_len = sel->msglist_len;
msglist_sel = sel->msglist_sel;
selid = lookup_child_selector (ps->gdbarch (), p);
if (!selid)
error (_("Can't find selector \"%s\""), p);
write_exp_elt_longcst (ps, selid);
xfree(p);
write_exp_elt_longcst (ps, val); /* Number of args */
xfree(sel);
return val;
}
/*
* Function: specialcmp (const char *a, const char *b)
*
* Special strcmp: treats ']' and ' ' as end-of-string.
* Used for qsorting lists of objc methods (either by class or selector).
*/
static int
specialcmp (const char *a, const char *b)
{
while (*a && *a != ' ' && *a != ']' && *b && *b != ' ' && *b != ']')
{
if (*a != *b)
return *a - *b;
a++, b++;
}
if (*a && *a != ' ' && *a != ']')
return 1; /* a is longer therefore greater. */
if (*b && *b != ' ' && *b != ']')
return -1; /* a is shorter therefore lesser. */
return 0; /* a and b are identical. */
}
/*
* Function: compare_selectors (const void *, const void *)
*
* Comparison function for use with qsort. Arguments are symbols or
* msymbols Compares selector part of objc method name alphabetically.
*/
static int
compare_selectors (const void *a, const void *b)
{
const char *aname, *bname;
aname = SYMBOL_PRINT_NAME (*(struct symbol **) a);
bname = SYMBOL_PRINT_NAME (*(struct symbol **) b);
if (aname == NULL || bname == NULL)
error (_("internal: compare_selectors(1)"));
aname = strchr(aname, ' ');
bname = strchr(bname, ' ');
if (aname == NULL || bname == NULL)
error (_("internal: compare_selectors(2)"));
return specialcmp (aname+1, bname+1);
}
/*
* Function: selectors_info (regexp, from_tty)
*
* Implements the "Info selectors" command. Takes an optional regexp
* arg. Lists all objective c selectors that match the regexp. Works
* by grepping thru all symbols for objective c methods. Output list
* is sorted and uniqued.
*/
static void
info_selectors_command (const char *regexp, int from_tty)
{
const char *name;
char *val;
int matches = 0;
int maxlen = 0;
int ix;
char myregexp[2048];
char asel[256];
struct symbol **sym_arr;
int plusminus = 0;
if (regexp == NULL)
strcpy(myregexp, ".*]"); /* Null input, match all objc methods. */
else
{
if (*regexp == '+' || *regexp == '-')
{ /* User wants only class methods or only instance methods. */
plusminus = *regexp++;
while (*regexp == ' ' || *regexp == '\t')
regexp++;
}
if (*regexp == '\0')
strcpy(myregexp, ".*]");
else
{
/* Allow a few extra bytes because of the strcat below. */
if (sizeof (myregexp) < strlen (regexp) + 4)
error (_("Regexp is too long: %s"), regexp);
strcpy(myregexp, regexp);
if (myregexp[strlen(myregexp) - 1] == '$') /* end of selector */
myregexp[strlen(myregexp) - 1] = ']'; /* end of method name */
else
strcat(myregexp, ".*]");
}
}
if (regexp != NULL)
{
val = re_comp (myregexp);
if (val != 0)
error (_("Invalid regexp (%s): %s"), val, regexp);
}
/* First time thru is JUST to get max length and count. */
for (objfile *objfile : current_program_space->objfiles ())
{
for (minimal_symbol *msymbol : objfile->msymbols ())
{
QUIT;
name = MSYMBOL_NATURAL_NAME (msymbol);
if (name
&& (name[0] == '-' || name[0] == '+')
&& name[1] == '[') /* Got a method name. */
{
/* Filter for class/instance methods. */
if (plusminus && name[0] != plusminus)
continue;
/* Find selector part. */
name = (char *) strchr (name+2, ' ');
if (name == NULL)
{
complaint (_("Bad method name '%s'"),
MSYMBOL_NATURAL_NAME (msymbol));
continue;
}
if (regexp == NULL || re_exec(++name) != 0)
{
const char *mystart = name;
const char *myend = strchr (mystart, ']');
if (myend && (myend - mystart > maxlen))
maxlen = myend - mystart; /* Get longest selector. */
matches++;
}
}
}
}
if (matches)
{
printf_filtered (_("Selectors matching \"%s\":\n\n"),
regexp ? regexp : "*");
sym_arr = XALLOCAVEC (struct symbol *, matches);
matches = 0;
for (objfile *objfile : current_program_space->objfiles ())
{
for (minimal_symbol *msymbol : objfile->msymbols ())
{
QUIT;
name = MSYMBOL_NATURAL_NAME (msymbol);
if (name &&
(name[0] == '-' || name[0] == '+') &&
name[1] == '[') /* Got a method name. */
{
/* Filter for class/instance methods. */
if (plusminus && name[0] != plusminus)
continue;
/* Find selector part. */
name = (char *) strchr(name+2, ' ');
if (regexp == NULL || re_exec(++name) != 0)
sym_arr[matches++] = (struct symbol *) msymbol;
}
}
}
qsort (sym_arr, matches, sizeof (struct minimal_symbol *),
compare_selectors);
/* Prevent compare on first iteration. */
asel[0] = 0;
for (ix = 0; ix < matches; ix++) /* Now do the output. */
{
char *p = asel;
QUIT;
name = SYMBOL_NATURAL_NAME (sym_arr[ix]);
name = strchr (name, ' ') + 1;
if (p[0] && specialcmp(name, p) == 0)
continue; /* Seen this one already (not unique). */
/* Copy selector part. */
while (*name && *name != ']')
*p++ = *name++;
*p++ = '\0';
/* Print in columns. */
puts_filtered_tabular(asel, maxlen + 1, 0);
}
begin_line();
}
else
printf_filtered (_("No selectors matching \"%s\"\n"),
regexp ? regexp : "*");
}
/*
* Function: compare_classes (const void *, const void *)
*
* Comparison function for use with qsort. Arguments are symbols or
* msymbols Compares class part of objc method name alphabetically.
*/
static int
compare_classes (const void *a, const void *b)
{
const char *aname, *bname;
aname = SYMBOL_PRINT_NAME (*(struct symbol **) a);
bname = SYMBOL_PRINT_NAME (*(struct symbol **) b);
if (aname == NULL || bname == NULL)
error (_("internal: compare_classes(1)"));
return specialcmp (aname+1, bname+1);
}
/*
* Function: classes_info(regexp, from_tty)
*
* Implements the "info classes" command for objective c classes.
* Lists all objective c classes that match the optional regexp.
* Works by grepping thru the list of objective c methods. List will
* be sorted and uniqued (since one class may have many methods).
* BUGS: will not list a class that has no methods.
*/
static void
info_classes_command (const char *regexp, int from_tty)
{
const char *name;
char *val;
int matches = 0;
int maxlen = 0;
int ix;
char myregexp[2048];
char aclass[256];
struct symbol **sym_arr;
if (regexp == NULL)
strcpy(myregexp, ".* "); /* Null input: match all objc classes. */
else
{
/* Allow a few extra bytes because of the strcat below. */
if (sizeof (myregexp) < strlen (regexp) + 4)
error (_("Regexp is too long: %s"), regexp);
strcpy(myregexp, regexp);
if (myregexp[strlen(myregexp) - 1] == '$')
/* In the method name, the end of the class name is marked by ' '. */
myregexp[strlen(myregexp) - 1] = ' ';
else
strcat(myregexp, ".* ");
}
if (regexp != NULL)
{
val = re_comp (myregexp);
if (val != 0)
error (_("Invalid regexp (%s): %s"), val, regexp);
}
/* First time thru is JUST to get max length and count. */
for (objfile *objfile : current_program_space->objfiles ())
{
for (minimal_symbol *msymbol : objfile->msymbols ())
{
QUIT;
name = MSYMBOL_NATURAL_NAME (msymbol);
if (name &&
(name[0] == '-' || name[0] == '+') &&
name[1] == '[') /* Got a method name. */
if (regexp == NULL || re_exec(name+2) != 0)
{
/* Compute length of classname part. */
const char *mystart = name + 2;
const char *myend = strchr (mystart, ' ');
if (myend && (myend - mystart > maxlen))
maxlen = myend - mystart;
matches++;
}
}
}
if (matches)
{
printf_filtered (_("Classes matching \"%s\":\n\n"),
regexp ? regexp : "*");
sym_arr = XALLOCAVEC (struct symbol *, matches);
matches = 0;
for (objfile *objfile : current_program_space->objfiles ())
{
for (minimal_symbol *msymbol : objfile->msymbols ())
{
QUIT;
name = MSYMBOL_NATURAL_NAME (msymbol);
if (name &&
(name[0] == '-' || name[0] == '+') &&
name[1] == '[') /* Got a method name. */
if (regexp == NULL || re_exec(name+2) != 0)
sym_arr[matches++] = (struct symbol *) msymbol;
}
}
qsort (sym_arr, matches, sizeof (struct minimal_symbol *),
compare_classes);
/* Prevent compare on first iteration. */
aclass[0] = 0;
for (ix = 0; ix < matches; ix++) /* Now do the output. */
{
char *p = aclass;
QUIT;
name = SYMBOL_NATURAL_NAME (sym_arr[ix]);
name += 2;
if (p[0] && specialcmp(name, p) == 0)
continue; /* Seen this one already (not unique). */
/* Copy class part of method name. */
while (*name && *name != ' ')
*p++ = *name++;
*p++ = '\0';
/* Print in columns. */
puts_filtered_tabular(aclass, maxlen + 1, 0);
}
begin_line();
}
else
printf_filtered (_("No classes matching \"%s\"\n"), regexp ? regexp : "*");
}
static char *
parse_selector (char *method, char **selector)
{
char *s1 = NULL;
char *s2 = NULL;
int found_quote = 0;
char *nselector = NULL;
gdb_assert (selector != NULL);
s1 = method;
s1 = skip_spaces (s1);
if (*s1 == '\'')
{
found_quote = 1;
s1++;
}
s1 = skip_spaces (s1);
nselector = s1;
s2 = s1;
for (;;)
{
if (isalnum (*s2) || (*s2 == '_') || (*s2 == ':'))
*s1++ = *s2;
else if (isspace (*s2))
;
else if ((*s2 == '\0') || (*s2 == '\''))
break;
else
return NULL;
s2++;
}
*s1++ = '\0';
s2 = skip_spaces (s2);
if (found_quote)
{
if (*s2 == '\'')
s2++;
s2 = skip_spaces (s2);
}
if (selector != NULL)
*selector = nselector;
return s2;
}
static char *
parse_method (char *method, char *type, char **theclass,
char **category, char **selector)
{
char *s1 = NULL;
char *s2 = NULL;
int found_quote = 0;
char ntype = '\0';
char *nclass = NULL;
char *ncategory = NULL;
char *nselector = NULL;
gdb_assert (type != NULL);
gdb_assert (theclass != NULL);
gdb_assert (category != NULL);
gdb_assert (selector != NULL);
s1 = method;
s1 = skip_spaces (s1);
if (*s1 == '\'')
{
found_quote = 1;
s1++;
}
s1 = skip_spaces (s1);
if ((s1[0] == '+') || (s1[0] == '-'))
ntype = *s1++;
s1 = skip_spaces (s1);
if (*s1 != '[')
return NULL;
s1++;
nclass = s1;
while (isalnum (*s1) || (*s1 == '_'))
s1++;
s2 = s1;
s2 = skip_spaces (s2);
if (*s2 == '(')
{
s2++;
s2 = skip_spaces (s2);
ncategory = s2;
while (isalnum (*s2) || (*s2 == '_'))
s2++;
*s2++ = '\0';
}
/* Truncate the class name now that we're not using the open paren. */
*s1++ = '\0';
nselector = s2;
s1 = s2;
for (;;)
{
if (isalnum (*s2) || (*s2 == '_') || (*s2 == ':'))
*s1++ = *s2;
else if (isspace (*s2))
;
else if (*s2 == ']')
break;
else
return NULL;
s2++;
}
*s1++ = '\0';
s2++;
s2 = skip_spaces (s2);
if (found_quote)
{
if (*s2 != '\'')
return NULL;
s2++;
s2 = skip_spaces (s2);
}
if (type != NULL)
*type = ntype;
if (theclass != NULL)
*theclass = nclass;
if (category != NULL)
*category = ncategory;
if (selector != NULL)
*selector = nselector;
return s2;
}
static void
find_methods (char type, const char *theclass, const char *category,
const char *selector,
std::vector *symbol_names)
{
const char *symname = NULL;
char ntype = '\0';
char *nclass = NULL;
char *ncategory = NULL;
char *nselector = NULL;
static char *tmp = NULL;
static unsigned int tmplen = 0;
gdb_assert (symbol_names != NULL);
for (objfile *objfile : current_program_space->objfiles ())
{
unsigned int *objc_csym;
/* The objfile_csym variable counts the number of ObjC methods
that this objfile defines. We save that count as a private
objfile data. If we have already determined that this objfile
provides no ObjC methods, we can skip it entirely. */
unsigned int objfile_csym = 0;
objc_csym = (unsigned int *) objfile_data (objfile, objc_objfile_data);
if (objc_csym != NULL && *objc_csym == 0)
/* There are no ObjC symbols in this objfile. Skip it entirely. */
continue;
for (minimal_symbol *msymbol : objfile->msymbols ())
{
QUIT;
/* Check the symbol name first as this can be done entirely without
sending any query to the target. */
symname = MSYMBOL_NATURAL_NAME (msymbol);
if (symname == NULL)
continue;
if ((symname[0] != '-' && symname[0] != '+') || (symname[1] != '['))
/* Not a method name. */
continue;
objfile_csym++;
/* Now that thinks are a bit sane, clean up the symname. */
while ((strlen (symname) + 1) >= tmplen)
{
tmplen = (tmplen == 0) ? 1024 : tmplen * 2;
tmp = (char *) xrealloc (tmp, tmplen);
}
strcpy (tmp, symname);
if (parse_method (tmp, &ntype, &nclass,
&ncategory, &nselector) == NULL)
continue;
if ((type != '\0') && (ntype != type))
continue;
if ((theclass != NULL)
&& ((nclass == NULL) || (strcmp (theclass, nclass) != 0)))
continue;
if ((category != NULL) &&
((ncategory == NULL) || (strcmp (category, ncategory) != 0)))
continue;
if ((selector != NULL) &&
((nselector == NULL) || (strcmp (selector, nselector) != 0)))
continue;
symbol_names->push_back (symname);
}
if (objc_csym == NULL)
{
objc_csym = XOBNEW (&objfile->objfile_obstack, unsigned int);
*objc_csym = objfile_csym;
set_objfile_data (objfile, objc_objfile_data, objc_csym);
}
else
/* Count of ObjC methods in this objfile should be constant. */
gdb_assert (*objc_csym == objfile_csym);
}
}
/* Uniquify a VEC of strings. */
static void
uniquify_strings (std::vector *strings)
{
if (strings->empty ())
return;
std::sort (strings->begin (), strings->end (), compare_cstrings);
strings->erase (std::unique (strings->begin (), strings->end (), streq),
strings->end ());
}
/*
* Function: find_imps (const char *selector, struct symbol **sym_arr)
*
* Input: a string representing a selector
* a pointer to an array of symbol pointers
* possibly a pointer to a symbol found by the caller.
*
* Output: number of methods that implement that selector. Side
* effects: The array of symbol pointers is filled with matching syms.
*
* By analogy with function "find_methods" (symtab.c), builds a list
* of symbols matching the ambiguous input, so that "decode_line_2"
* (symtab.c) can list them and ask the user to choose one or more.
* In this case the matches are objective c methods
* ("implementations") matching an objective c selector.
*
* Note that it is possible for a normal (c-style) function to have
* the same name as an objective c selector. To prevent the selector
* from eclipsing the function, we allow the caller (decode_line_1) to
* search for such a function first, and if it finds one, pass it in
* to us. We will then integrate it into the list. We also search
* for one here, among the minsyms.
*
* NOTE: if NUM_DEBUGGABLE is non-zero, the sym_arr will be divided
* into two parts: debuggable (struct symbol) syms, and
* non_debuggable (struct minimal_symbol) syms. The debuggable
* ones will come first, before NUM_DEBUGGABLE (which will thus
* be the index of the first non-debuggable one).
*/
const char *
find_imps (const char *method, std::vector *symbol_names)
{
char type = '\0';
char *theclass = NULL;
char *category = NULL;
char *selector = NULL;
char *buf = NULL;
char *tmp = NULL;
int selector_case = 0;
gdb_assert (symbol_names != NULL);
buf = (char *) alloca (strlen (method) + 1);
strcpy (buf, method);
tmp = parse_method (buf, &type, &theclass, &category, &selector);
if (tmp == NULL)
{
strcpy (buf, method);
tmp = parse_selector (buf, &selector);
if (tmp == NULL)
return NULL;
selector_case = 1;
}
find_methods (type, theclass, category, selector, symbol_names);
/* If we hit the "selector" case, and we found some methods, then
add the selector itself as a symbol, if it exists. */
if (selector_case && !symbol_names->empty ())
{
struct symbol *sym = lookup_symbol (selector, NULL, VAR_DOMAIN,
0).symbol;
if (sym != NULL)
symbol_names->push_back (SYMBOL_NATURAL_NAME (sym));
else
{
struct bound_minimal_symbol msym
= lookup_minimal_symbol (selector, 0, 0);
if (msym.minsym != NULL)
symbol_names->push_back (MSYMBOL_NATURAL_NAME (msym.minsym));
}
}
uniquify_strings (symbol_names);
return method + (tmp - buf);
}
static void
print_object_command (const char *args, int from_tty)
{
struct value *object, *function, *description;
CORE_ADDR string_addr, object_addr;
int i = 0;
gdb_byte c = 0;
if (!args || !*args)
error (
"The 'print-object' command requires an argument (an Objective-C object)");
{
expression_up expr = parse_expression (args);
int pc = 0;
object = evaluate_subexp (builtin_type (expr->gdbarch)->builtin_data_ptr,
expr.get (), &pc, EVAL_NORMAL);
}
/* Validate the address for sanity. */
object_addr = value_as_long (object);
read_memory (object_addr, &c, 1);
function = find_function_in_inferior ("_NSPrintForDebugger", NULL);
if (function == NULL)
error (_("Unable to locate _NSPrintForDebugger in child process"));
description = call_function_by_hand (function, NULL, object);
string_addr = value_as_long (description);
if (string_addr == 0)
error (_("object returns null description"));
read_memory (string_addr + i++, &c, 1);
if (c != 0)
do
{ /* Read and print characters up to EOS. */
QUIT;
printf_filtered ("%c", c);
read_memory (string_addr + i++, &c, 1);
} while (c != 0);
else
printf_filtered(_("