/* Abstraction of GNU v3 abi.
Contributed by Jim Blandy <jimb@redhat.com>
- Copyright (C) 2001, 2002, 2003, 2005, 2006, 2007, 2008, 2009, 2010, 2011
- Free Software Foundation, Inc.
+ Copyright (C) 2001-2013 Free Software Foundation, Inc.
This file is part of GDB.
#include "objfiles.h"
#include "valprint.h"
#include "c-lang.h"
+#include "exceptions.h"
+#include "typeprint.h"
#include "gdb_assert.h"
#include "gdb_string.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)
{
/* ptrdiff_t vcall_and_vbase_offsets[0]; */
FIELD_NAME (*field) = "vcall_and_vbase_offsets";
FIELD_TYPE (*field) = lookup_array_range_type (ptrdiff_type, 0, -1);
- FIELD_BITPOS (*field) = offset * TARGET_CHAR_BIT;
+ SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT);
offset += TYPE_LENGTH (FIELD_TYPE (*field));
field++;
/* ptrdiff_t offset_to_top; */
FIELD_NAME (*field) = "offset_to_top";
FIELD_TYPE (*field) = ptrdiff_type;
- FIELD_BITPOS (*field) = offset * TARGET_CHAR_BIT;
+ SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT);
offset += TYPE_LENGTH (FIELD_TYPE (*field));
field++;
/* void *type_info; */
FIELD_NAME (*field) = "type_info";
FIELD_TYPE (*field) = void_ptr_type;
- FIELD_BITPOS (*field) = offset * TARGET_CHAR_BIT;
+ SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT);
offset += TYPE_LENGTH (FIELD_TYPE (*field));
field++;
/* void (*virtual_functions[0]) (); */
FIELD_NAME (*field) = "virtual_functions";
FIELD_TYPE (*field) = lookup_array_range_type (ptr_to_void_fn_type, 0, -1);
- FIELD_BITPOS (*field) = offset * TARGET_CHAR_BIT;
+ SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT);
offset += TYPE_LENGTH (FIELD_TYPE (*field));
field++;
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)
return NULL;
+ /* Java doesn't have RTTI following the C++ ABI. */
+ if (TYPE_CPLUS_REALLY_JAVA (values_type))
+ return NULL;
+
/* Determine architecture. */
gdbarch = get_type_arch (values_type);
/* 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;
|| strncmp (vtable_symbol_name, "vtable for ", 11))
{
warning (_("can't find linker symbol for virtual table for `%s' value"),
- TYPE_NAME (values_type));
+ TYPE_SAFE_NAME (values_type));
if (vtable_symbol_name)
warning (_(" found `%s' instead"), vtable_symbol_name);
return NULL;
}
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);
ptr_type = builtin_type (gdbarch)->builtin_data_ptr;
/* If it isn't a virtual base, this is easy. The offset is in the
- type definition. */
- if (!BASETYPE_VIA_VIRTUAL (type, index))
+ type definition. Likewise for Java, which doesn't really have
+ virtual inheritance in the C++ sense. */
+ if (!BASETYPE_VIA_VIRTUAL (type, index) || TYPE_CPLUS_REALLY_JAVA (type))
return TYPE_BASECLASS_BITPOS (type, index) / 8;
/* To access a virtual base, we need to use the vbase offset stored in
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);
}
print_longest (stream, 'd', 1, ptr_value);
}
else
- print_address_demangle (gdbarch, ptr_value, stream, demangle);
+ {
+ struct value_print_options opts;
+
+ get_user_print_options (&opts);
+ print_address_demangle (&opts, gdbarch, ptr_value, stream, demangle);
+ }
if (adjustment)
{
return value_from_pointer (lookup_pointer_type (method_type), ptr_value);
}
+/* Objects of this type are stored in a hash table and a vector when
+ printing the vtables for a class. */
+
+struct value_and_voffset
+{
+ /* The value representing the object. */
+ struct value *value;
+
+ /* The maximum vtable offset we've found for any object at this
+ offset in the outermost object. */
+ int max_voffset;
+};
+
+typedef struct value_and_voffset *value_and_voffset_p;
+DEF_VEC_P (value_and_voffset_p);
+
+/* Hash function for value_and_voffset. */
+
+static hashval_t
+hash_value_and_voffset (const void *p)
+{
+ const struct value_and_voffset *o = p;
+
+ return value_address (o->value) + value_embedded_offset (o->value);
+}
+
+/* Equality function for value_and_voffset. */
+
+static int
+eq_value_and_voffset (const void *a, const void *b)
+{
+ const struct value_and_voffset *ova = a;
+ const struct value_and_voffset *ovb = b;
+
+ return (value_address (ova->value) + value_embedded_offset (ova->value)
+ == value_address (ovb->value) + value_embedded_offset (ovb->value));
+}
+
+/* qsort comparison function for value_and_voffset. */
+
+static int
+compare_value_and_voffset (const void *a, const void *b)
+{
+ const struct value_and_voffset * const *ova = a;
+ CORE_ADDR addra = (value_address ((*ova)->value)
+ + value_embedded_offset ((*ova)->value));
+ const struct value_and_voffset * const *ovb = b;
+ CORE_ADDR addrb = (value_address ((*ovb)->value)
+ + value_embedded_offset ((*ovb)->value));
+
+ if (addra < addrb)
+ return -1;
+ if (addra > addrb)
+ return 1;
+ return 0;
+}
+
+/* A helper function used when printing vtables. This determines the
+ key (most derived) sub-object at each address and also computes the
+ maximum vtable offset seen for the corresponding vtable. Updates
+ OFFSET_HASH and OFFSET_VEC with a new value_and_voffset object, if
+ needed. VALUE is the object to examine. */
+
+static void
+compute_vtable_size (htab_t offset_hash,
+ VEC (value_and_voffset_p) **offset_vec,
+ struct value *value)
+{
+ int i;
+ struct type *type = check_typedef (value_type (value));
+ void **slot;
+ struct value_and_voffset search_vo, *current_vo;
+
+ /* If the object is not dynamic, then we are done; as it cannot have
+ dynamic base types either. */
+ if (!gnuv3_dynamic_class (type))
+ return;
+
+ /* Update the hash and the vec, if needed. */
+ search_vo.value = value;
+ slot = htab_find_slot (offset_hash, &search_vo, INSERT);
+ if (*slot)
+ current_vo = *slot;
+ else
+ {
+ current_vo = XNEW (struct value_and_voffset);
+ current_vo->value = value;
+ current_vo->max_voffset = -1;
+ *slot = current_vo;
+ VEC_safe_push (value_and_voffset_p, *offset_vec, current_vo);
+ }
+
+ /* Update the value_and_voffset object with the highest vtable
+ offset from this class. */
+ for (i = 0; i < TYPE_NFN_FIELDS (type); ++i)
+ {
+ int j;
+ struct fn_field *fn = TYPE_FN_FIELDLIST1 (type, i);
+
+ for (j = 0; j < TYPE_FN_FIELDLIST_LENGTH (type, i); ++j)
+ {
+ if (TYPE_FN_FIELD_VIRTUAL_P (fn, j))
+ {
+ int voffset = TYPE_FN_FIELD_VOFFSET (fn, j);
+
+ if (voffset > current_vo->max_voffset)
+ current_vo->max_voffset = voffset;
+ }
+ }
+ }
+
+ /* Recurse into base classes. */
+ for (i = 0; i < TYPE_N_BASECLASSES (type); ++i)
+ compute_vtable_size (offset_hash, offset_vec, value_field (value, i));
+}
+
+/* Helper for gnuv3_print_vtable that prints a single vtable. */
+
+static void
+print_one_vtable (struct gdbarch *gdbarch, struct value *value,
+ int max_voffset,
+ struct value_print_options *opts)
+{
+ int i;
+ struct type *type = check_typedef (value_type (value));
+ struct value *vtable;
+ CORE_ADDR vt_addr;
+
+ vtable = gnuv3_get_vtable (gdbarch, type,
+ value_address (value)
+ + value_embedded_offset (value));
+ vt_addr = value_address (value_field (vtable,
+ vtable_field_virtual_functions));
+
+ printf_filtered (_("vtable for '%s' @ %s (subobject @ %s):\n"),
+ TYPE_SAFE_NAME (type),
+ paddress (gdbarch, vt_addr),
+ paddress (gdbarch, (value_address (value)
+ + value_embedded_offset (value))));
+
+ for (i = 0; i <= max_voffset; ++i)
+ {
+ /* Initialize it just to avoid a GCC false warning. */
+ CORE_ADDR addr = 0;
+ struct value *vfn;
+ volatile struct gdb_exception ex;
+
+ printf_filtered ("[%d]: ", i);
+
+ vfn = value_subscript (value_field (vtable,
+ vtable_field_virtual_functions),
+ i);
+
+ if (gdbarch_vtable_function_descriptors (gdbarch))
+ vfn = value_addr (vfn);
+
+ TRY_CATCH (ex, RETURN_MASK_ERROR)
+ {
+ addr = value_as_address (vfn);
+ }
+ if (ex.reason < 0)
+ printf_filtered (_("<error: %s>"), ex.message);
+ else
+ print_function_pointer_address (opts, gdbarch, addr, gdb_stdout);
+ printf_filtered ("\n");
+ }
+}
+
+/* Implementation of the print_vtable method. */
+
+static void
+gnuv3_print_vtable (struct value *value)
+{
+ struct gdbarch *gdbarch;
+ struct type *type;
+ struct value *vtable;
+ struct value_print_options opts;
+ htab_t offset_hash;
+ struct cleanup *cleanup;
+ VEC (value_and_voffset_p) *result_vec = NULL;
+ struct value_and_voffset *iter;
+ int i, count;
+
+ value = coerce_ref (value);
+ type = check_typedef (value_type (value));
+ if (TYPE_CODE (type) == TYPE_CODE_PTR)
+ {
+ value = value_ind (value);
+ type = check_typedef (value_type (value));
+ }
+
+ get_user_print_options (&opts);
+
+ /* Respect 'set print object'. */
+ if (opts.objectprint)
+ {
+ value = value_full_object (value, NULL, 0, 0, 0);
+ type = check_typedef (value_type (value));
+ }
+
+ gdbarch = get_type_arch (type);
+ vtable = gnuv3_get_vtable (gdbarch, type,
+ value_as_address (value_addr (value)));
+
+ if (!vtable)
+ {
+ printf_filtered (_("This object does not have a virtual function table\n"));
+ return;
+ }
+
+ offset_hash = htab_create_alloc (1, hash_value_and_voffset,
+ eq_value_and_voffset,
+ xfree, xcalloc, xfree);
+ cleanup = make_cleanup_htab_delete (offset_hash);
+ make_cleanup (VEC_cleanup (value_and_voffset_p), &result_vec);
+
+ compute_vtable_size (offset_hash, &result_vec, value);
+
+ qsort (VEC_address (value_and_voffset_p, result_vec),
+ VEC_length (value_and_voffset_p, result_vec),
+ sizeof (value_and_voffset_p),
+ compare_value_and_voffset);
+
+ count = 0;
+ for (i = 0; VEC_iterate (value_and_voffset_p, result_vec, i, iter); ++i)
+ {
+ if (iter->max_voffset >= 0)
+ {
+ if (count > 0)
+ printf_filtered ("\n");
+ print_one_vtable (gdbarch, iter->value, iter->max_voffset, &opts);
+ ++count;
+ }
+ }
+
+ 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_CLASS
+ && 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 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 == NULL)
+ error (_("could not find typeinfo symbol for '%s'"), typename);
+
+ result = value_at_lazy (typeinfo_type, SYMBOL_VALUE_ADDRESS (minsym));
+ }
+
+ do_cleanups (cleanup);
+ return result;
+}
+
+/* Get the type name given a type_info object. */
+
+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 = SYMBOL_DEMANGLED_NAME (typeinfo_sym.minsym);
+ if (symname == NULL || strncmp (symname, TYPEINFO_PREFIX,
+ TYPEINFO_PREFIX_LEN))
+ error (_("typeinfo symbol '%s' has unexpected name"),
+ SYMBOL_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. */
struct gdbarch *gdbarch = get_frame_arch (frame);
struct minimal_symbol *thunk_sym, *fn_sym;
struct obj_section *section;
- char *thunk_name, *fn_name;
+ const char *thunk_name, *fn_name;
real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc);
if (real_stop_pc == 0)
real_stop_pc = stop_pc;
/* Find the linker symbol for this potential thunk. */
- thunk_sym = lookup_minimal_symbol_by_pc (real_stop_pc);
+ thunk_sym = lookup_minimal_symbol_by_pc (real_stop_pc).minsym;
section = find_pc_section (real_stop_pc);
if (thunk_sym == NULL || section == NULL)
return 0;
fieldelem++)
{
struct fn_field *fn = TYPE_FN_FIELDLIST1 (type, fieldnum);
- char *name = TYPE_FN_FIELDLIST_NAME (type, fieldnum);
+ const char *name = TYPE_FN_FIELDLIST_NAME (type, fieldnum);
struct type *fieldtype = TYPE_FN_FIELD_TYPE (fn, fieldelem);
/* If this function is marked as artificial, it is compiler-generated,
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
{
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.method_ptr_size = gnuv3_method_ptr_size;
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.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);
}
projects / thirdparty / binutils-gdb.git / blobdiff