/* Abstraction of GNU v3 abi.
Contributed by Jim Blandy <jimb@redhat.com>
- Copyright (C) 2001-2003, 2005-2012 Free Software Foundation, Inc.
+ Copyright (C) 2001-2015 Free Software Foundation, Inc.
This file is part of GDB.
#include "objfiles.h"
#include "valprint.h"
#include "c-lang.h"
-#include "exceptions.h"
-
-#include "gdb_assert.h"
-#include "gdb_string.h"
+#include "typeprint.h"
static struct cp_abi_ops gnu_v3_abi_ops;
+/* A gdbarch key for std::type_info, in the event that it can't be
+ found in the debug info. */
+
+static struct gdbarch_data *std_type_info_gdbarch_data;
+
+
static int
gnuv3_is_vtable_name (const char *name)
{
TYPE_TAG_NAME (t) = "gdb_gnu_v3_abi_vtable";
INIT_CPLUS_SPECIFIC (t);
- return t;
+ return make_type_with_address_space (t, TYPE_INSTANCE_FLAG_CODE_SPACE);
}
const char *class_name;
struct type *run_time_type;
LONGEST offset_to_top;
+ char *atsign;
/* We only have RTTI for class objects. */
- if (TYPE_CODE (values_type) != TYPE_CODE_CLASS)
+ if (TYPE_CODE (values_type) != TYPE_CODE_STRUCT)
return NULL;
/* Java doesn't have RTTI following the C++ ABI. */
/* Find the linker symbol for this vtable. */
vtable_symbol
= lookup_minimal_symbol_by_pc (value_address (vtable)
- + value_embedded_offset (vtable));
+ + value_embedded_offset (vtable)).minsym;
if (! vtable_symbol)
return NULL;
If we didn't like this approach, we could instead look in the
type_info object itself to get the class name. But this way
should work just as well, and doesn't read target memory. */
- vtable_symbol_name = SYMBOL_DEMANGLED_NAME (vtable_symbol);
+ vtable_symbol_name = MSYMBOL_DEMANGLED_NAME (vtable_symbol);
if (vtable_symbol_name == NULL
|| strncmp (vtable_symbol_name, "vtable for ", 11))
{
}
class_name = vtable_symbol_name + 11;
+ /* Strip off @plt and version suffixes. */
+ atsign = strchr (class_name, '@');
+ if (atsign != NULL)
+ {
+ char *copy;
+
+ copy = alloca (atsign - class_name + 1);
+ memcpy (copy, class_name, atsign - class_name);
+ copy[atsign - class_name] = '\0';
+ class_name = copy;
+ }
+
/* Try to look up the class name as a type name. */
/* FIXME: chastain/2003-11-26: block=NULL is bogus. See pr gdb/1465. */
run_time_type = cp_lookup_rtti_type (class_name, NULL);
struct gdbarch *gdbarch;
/* Some simple sanity checks. */
- if (TYPE_CODE (values_type) != TYPE_CODE_CLASS)
+ if (TYPE_CODE (values_type) != TYPE_CODE_STRUCT)
error (_("Only classes can have virtual functions."));
/* Determine architecture. */
possible paths to the method based on the adjustment. */
if (physname)
{
- char *demangled_name = cplus_demangle (physname,
- DMGL_ANSI | DMGL_PARAMS);
+ char *demangled_name = gdb_demangle (physname,
+ DMGL_ANSI | DMGL_PARAMS);
fprintf_filtered (stream, "&virtual ");
if (demangled_name == NULL)
{
/* Found a non-virtual function: print out the type. */
fputs_filtered ("(", stream);
- c_print_type (type, "", stream, -1, 0);
+ c_print_type (type, "", stream, -1, 0, &type_print_raw_options);
fputs_filtered (") ", stream);
}
struct type *type = check_typedef (value_type (value));
void **slot;
struct value_and_voffset search_vo, *current_vo;
- CORE_ADDR addr = value_address (value) + value_embedded_offset (value);
/* If the object is not dynamic, then we are done; as it cannot have
dynamic base types either. */
do_cleanups (cleanup);
}
+/* Return a GDB type representing `struct std::type_info', laid out
+ appropriately for ARCH.
+
+ We use this function as the gdbarch per-architecture data
+ initialization function. */
+
+static void *
+build_std_type_info_type (struct gdbarch *arch)
+{
+ struct type *t;
+ struct field *field_list, *field;
+ int offset;
+ struct type *void_ptr_type
+ = builtin_type (arch)->builtin_data_ptr;
+ struct type *char_type
+ = builtin_type (arch)->builtin_char;
+ struct type *char_ptr_type
+ = make_pointer_type (make_cv_type (1, 0, char_type, NULL), NULL);
+
+ field_list = xmalloc (sizeof (struct field [2]));
+ memset (field_list, 0, sizeof (struct field [2]));
+ field = &field_list[0];
+ offset = 0;
+
+ /* The vtable. */
+ FIELD_NAME (*field) = "_vptr.type_info";
+ FIELD_TYPE (*field) = void_ptr_type;
+ SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT);
+ offset += TYPE_LENGTH (FIELD_TYPE (*field));
+ field++;
+
+ /* The name. */
+ FIELD_NAME (*field) = "__name";
+ FIELD_TYPE (*field) = char_ptr_type;
+ SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT);
+ offset += TYPE_LENGTH (FIELD_TYPE (*field));
+ field++;
+
+ gdb_assert (field == (field_list + 2));
+
+ t = arch_type (arch, TYPE_CODE_STRUCT, offset, NULL);
+ TYPE_NFIELDS (t) = field - field_list;
+ TYPE_FIELDS (t) = field_list;
+ TYPE_TAG_NAME (t) = "gdb_gnu_v3_type_info";
+ INIT_CPLUS_SPECIFIC (t);
+
+ return t;
+}
+
+/* Implement the 'get_typeid_type' method. */
+
+static struct type *
+gnuv3_get_typeid_type (struct gdbarch *gdbarch)
+{
+ struct symbol *typeinfo;
+ struct type *typeinfo_type;
+
+ typeinfo = lookup_symbol ("std::type_info", NULL, STRUCT_DOMAIN, NULL);
+ if (typeinfo == NULL)
+ typeinfo_type = gdbarch_data (gdbarch, std_type_info_gdbarch_data);
+ else
+ typeinfo_type = SYMBOL_TYPE (typeinfo);
+
+ return typeinfo_type;
+}
+
+/* Implement the 'get_typeid' method. */
+
+static struct value *
+gnuv3_get_typeid (struct value *value)
+{
+ struct type *typeinfo_type;
+ struct type *type;
+ struct gdbarch *gdbarch;
+ struct cleanup *cleanup;
+ struct value *result;
+ char *typename, *canonical;
+
+ /* We have to handle values a bit trickily here, to allow this code
+ to work properly with non_lvalue values that are really just
+ disguised types. */
+ if (value_lval_const (value) == lval_memory)
+ value = coerce_ref (value);
+
+ type = check_typedef (value_type (value));
+
+ /* In the non_lvalue case, a reference might have slipped through
+ here. */
+ if (TYPE_CODE (type) == TYPE_CODE_REF)
+ type = check_typedef (TYPE_TARGET_TYPE (type));
+
+ /* Ignore top-level cv-qualifiers. */
+ type = make_cv_type (0, 0, type, NULL);
+ gdbarch = get_type_arch (type);
+
+ typename = type_to_string (type);
+ if (typename == NULL)
+ error (_("cannot find typeinfo for unnamed type"));
+ cleanup = make_cleanup (xfree, typename);
+
+ /* We need to canonicalize the type name here, because we do lookups
+ using the demangled name, and so we must match the format it
+ uses. E.g., GDB tends to use "const char *" as a type name, but
+ the demangler uses "char const *". */
+ canonical = cp_canonicalize_string (typename);
+ if (canonical != NULL)
+ {
+ make_cleanup (xfree, canonical);
+ typename = canonical;
+ }
+
+ typeinfo_type = gnuv3_get_typeid_type (gdbarch);
+
+ /* We check for lval_memory because in the "typeid (type-id)" case,
+ the type is passed via a not_lval value object. */
+ if (TYPE_CODE (type) == TYPE_CODE_STRUCT
+ && value_lval_const (value) == lval_memory
+ && gnuv3_dynamic_class (type))
+ {
+ struct value *vtable, *typeinfo_value;
+ CORE_ADDR address = value_address (value) + value_embedded_offset (value);
+
+ vtable = gnuv3_get_vtable (gdbarch, type, address);
+ if (vtable == NULL)
+ error (_("cannot find typeinfo for object of type '%s'"), typename);
+ typeinfo_value = value_field (vtable, vtable_field_type_info);
+ result = value_ind (value_cast (make_pointer_type (typeinfo_type, NULL),
+ typeinfo_value));
+ }
+ else
+ {
+ char *sym_name;
+ struct bound_minimal_symbol minsym;
+
+ sym_name = concat ("typeinfo for ", typename, (char *) NULL);
+ make_cleanup (xfree, sym_name);
+ minsym = lookup_minimal_symbol (sym_name, NULL, NULL);
+
+ if (minsym.minsym == NULL)
+ error (_("could not find typeinfo symbol for '%s'"), typename);
+
+ result = value_at_lazy (typeinfo_type, BMSYMBOL_VALUE_ADDRESS (minsym));
+ }
+
+ do_cleanups (cleanup);
+ return result;
+}
+
+/* Implement the 'get_typename_from_type_info' method. */
+
+static char *
+gnuv3_get_typename_from_type_info (struct value *type_info_ptr)
+{
+ struct gdbarch *gdbarch = get_type_arch (value_type (type_info_ptr));
+ struct bound_minimal_symbol typeinfo_sym;
+ CORE_ADDR addr;
+ const char *symname;
+ const char *class_name;
+ const char *atsign;
+
+ addr = value_as_address (type_info_ptr);
+ typeinfo_sym = lookup_minimal_symbol_by_pc (addr);
+ if (typeinfo_sym.minsym == NULL)
+ error (_("could not find minimal symbol for typeinfo address %s"),
+ paddress (gdbarch, addr));
+
+#define TYPEINFO_PREFIX "typeinfo for "
+#define TYPEINFO_PREFIX_LEN (sizeof (TYPEINFO_PREFIX) - 1)
+ symname = MSYMBOL_DEMANGLED_NAME (typeinfo_sym.minsym);
+ if (symname == NULL || strncmp (symname, TYPEINFO_PREFIX,
+ TYPEINFO_PREFIX_LEN))
+ error (_("typeinfo symbol '%s' has unexpected name"),
+ MSYMBOL_LINKAGE_NAME (typeinfo_sym.minsym));
+ class_name = symname + TYPEINFO_PREFIX_LEN;
+
+ /* Strip off @plt and version suffixes. */
+ atsign = strchr (class_name, '@');
+ if (atsign != NULL)
+ return savestring (class_name, atsign - class_name);
+ return xstrdup (class_name);
+}
+
+/* Implement the 'get_type_from_type_info' method. */
+
+static struct type *
+gnuv3_get_type_from_type_info (struct value *type_info_ptr)
+{
+ char *typename;
+ struct cleanup *cleanup;
+ struct value *type_val;
+ struct expression *expr;
+ struct type *result;
+
+ typename = gnuv3_get_typename_from_type_info (type_info_ptr);
+ cleanup = make_cleanup (xfree, typename);
+
+ /* We have to parse the type name, since in general there is not a
+ symbol for a type. This is somewhat bogus since there may be a
+ mis-parse. Another approach might be to re-use the demangler's
+ internal form to reconstruct the type somehow. */
+
+ expr = parse_expression (typename);
+ make_cleanup (xfree, expr);
+
+ type_val = evaluate_type (expr);
+ result = value_type (type_val);
+
+ do_cleanups (cleanup);
+ return result;
+}
+
/* Determine if we are currently in a C++ thunk. If so, get the address
of the routine we are thunking to and continue to there instead. */
static CORE_ADDR
gnuv3_skip_trampoline (struct frame_info *frame, CORE_ADDR stop_pc)
{
- CORE_ADDR real_stop_pc, method_stop_pc;
+ CORE_ADDR real_stop_pc, method_stop_pc, func_addr;
struct gdbarch *gdbarch = get_frame_arch (frame);
- struct minimal_symbol *thunk_sym, *fn_sym;
+ struct bound_minimal_symbol thunk_sym, fn_sym;
struct obj_section *section;
const char *thunk_name, *fn_name;
/* Find the linker symbol for this potential thunk. */
thunk_sym = lookup_minimal_symbol_by_pc (real_stop_pc);
section = find_pc_section (real_stop_pc);
- if (thunk_sym == NULL || section == NULL)
+ if (thunk_sym.minsym == NULL || section == NULL)
return 0;
/* The symbol's demangled name should be something like "virtual
thunk to FUNCTION", where FUNCTION is the name of the function
being thunked to. */
- thunk_name = SYMBOL_DEMANGLED_NAME (thunk_sym);
+ thunk_name = MSYMBOL_DEMANGLED_NAME (thunk_sym.minsym);
if (thunk_name == NULL || strstr (thunk_name, " thunk to ") == NULL)
return 0;
fn_name = strstr (thunk_name, " thunk to ") + strlen (" thunk to ");
fn_sym = lookup_minimal_symbol (fn_name, NULL, section->objfile);
- if (fn_sym == NULL)
+ if (fn_sym.minsym == NULL)
return 0;
- method_stop_pc = SYMBOL_VALUE_ADDRESS (fn_sym);
+ method_stop_pc = BMSYMBOL_VALUE_ADDRESS (fn_sym);
+
+ /* Some targets have minimal symbols pointing to function descriptors
+ (powerpc 64 for example). Make sure to retrieve the address
+ of the real function from the function descriptor before passing on
+ the address to other layers of GDB. */
+ func_addr = gdbarch_convert_from_func_ptr_addr (gdbarch, method_stop_pc,
+ ¤t_target);
+ if (func_addr != 0)
+ method_stop_pc = func_addr;
+
real_stop_pc = gdbarch_skip_trampoline_code
(gdbarch, frame, method_stop_pc);
if (real_stop_pc == 0)
/* We're only interested in things that can have methods. */
if (TYPE_CODE (type) != TYPE_CODE_STRUCT
- && TYPE_CODE (type) != TYPE_CODE_CLASS
&& TYPE_CODE (type) != TYPE_CODE_UNION)
return 0;
+ /* A dynamic class has a non-trivial copy constructor.
+ See c++98 section 12.8 Copying class objects [class.copy]. */
+ if (gnuv3_dynamic_class (type))
+ return 1;
+
for (fieldnum = 0; fieldnum < TYPE_NFN_FIELDS (type); fieldnum++)
for (fieldelem = 0; fieldelem < TYPE_FN_FIELDLIST_LENGTH (type, fieldnum);
fieldelem++)
with the mangled name. We don't have a convenient function
to strip off both leading scope qualifiers and trailing
template arguments yet. */
- if (!is_constructor_name (TYPE_FN_FIELD_PHYSNAME (fn, fieldelem)))
+ if (!is_constructor_name (TYPE_FN_FIELD_PHYSNAME (fn, fieldelem))
+ && !TYPE_FN_FIELD_CONSTRUCTOR (fn, fieldelem))
continue;
/* If this method takes two arguments, and the second argument is
a reference to this class, then it is a copy constructor. */
- if (TYPE_NFIELDS (fieldtype) == 2
- && TYPE_CODE (TYPE_FIELD_TYPE (fieldtype, 1)) == TYPE_CODE_REF
- && check_typedef (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (fieldtype,
- 1))) == type)
- return 1;
+ if (TYPE_NFIELDS (fieldtype) == 2)
+ {
+ struct type *arg_type = TYPE_FIELD_TYPE (fieldtype, 1);
+
+ if (TYPE_CODE (arg_type) == TYPE_CODE_REF)
+ {
+ struct type *arg_target_type;
+
+ arg_target_type = check_typedef (TYPE_TARGET_TYPE (arg_type));
+ if (class_types_same_p (arg_target_type, type))
+ return 1;
+ }
+ }
}
/* Even if all the constructors and destructors were artificial, one
{
vtable_type_gdbarch_data
= gdbarch_data_register_post_init (build_gdb_vtable_type);
+ std_type_info_gdbarch_data
+ = gdbarch_data_register_post_init (build_std_type_info_type);
gnu_v3_abi_ops.shortname = "gnu-v3";
gnu_v3_abi_ops.longname = "GNU G++ Version 3 ABI";
gnu_v3_abi_ops.make_method_ptr = gnuv3_make_method_ptr;
gnu_v3_abi_ops.method_ptr_to_value = gnuv3_method_ptr_to_value;
gnu_v3_abi_ops.print_vtable = gnuv3_print_vtable;
+ gnu_v3_abi_ops.get_typeid = gnuv3_get_typeid;
+ gnu_v3_abi_ops.get_typeid_type = gnuv3_get_typeid_type;
+ gnu_v3_abi_ops.get_type_from_type_info = gnuv3_get_type_from_type_info;
+ gnu_v3_abi_ops.get_typename_from_type_info
+ = gnuv3_get_typename_from_type_info;
gnu_v3_abi_ops.skip_trampoline = gnuv3_skip_trampoline;
gnu_v3_abi_ops.pass_by_reference = gnuv3_pass_by_reference;
}
init_gnuv3_ops ();
register_cp_abi (&gnu_v3_abi_ops);
+ set_cp_abi_as_auto_default (gnu_v3_abi_ops.shortname);
}
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