X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Fgnu-v3-abi.c;h=6812c1dcd7b88d171648a1f08b91960482a1ae01;hb=cc16e6c91580e68369250f5a65c6e01559cdd467;hp=6c6f92ce06e8e25ac07ca7af171121fc17c91158;hpb=eb2a6f420b324bc81207c7606ebef9db3a9bb984;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/gnu-v3-abi.c b/gdb/gnu-v3-abi.c index 6c6f92ce06..6812c1dcd7 100644 --- a/gdb/gnu-v3-abi.c +++ b/gdb/gnu-v3-abi.c @@ -1,8 +1,7 @@ /* Abstraction of GNU v3 abi. Contributed by Jim Blandy - 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. @@ -27,12 +26,20 @@ #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) { @@ -130,28 +137,28 @@ build_gdb_vtable_type (struct gdbarch *arch) /* 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++; @@ -282,6 +289,7 @@ gnuv3_rtti_type (struct value *value, 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) @@ -305,7 +313,7 @@ gnuv3_rtti_type (struct value *value, /* 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; @@ -319,13 +327,25 @@ gnuv3_rtti_type (struct value *value, || 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); @@ -430,8 +450,9 @@ gnuv3_baseclass_offset (struct type *type, int index, 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 @@ -591,8 +612,8 @@ gnuv3_print_method_ptr (const gdb_byte *contents, 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) @@ -609,7 +630,7 @@ gnuv3_print_method_ptr (const gdb_byte *contents, { /* 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); } @@ -620,7 +641,12 @@ gnuv3_print_method_ptr (const gdb_byte *contents, 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) { @@ -726,6 +752,455 @@ gnuv3_method_ptr_to_value (struct value **this_p, struct value *method_ptr) 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 (_(""), 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; +} + +/* 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 = 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. */ @@ -736,14 +1211,14 @@ gnuv3_skip_trampoline (struct frame_info *frame, CORE_ADDR stop_pc) 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; @@ -805,7 +1280,7 @@ gnuv3_pass_by_reference (struct type *type) 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, @@ -825,7 +1300,8 @@ gnuv3_pass_by_reference (struct type *type) 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 @@ -857,6 +1333,8 @@ init_gnuv3_ops (void) { 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"; @@ -874,6 +1352,12 @@ init_gnuv3_ops (void) 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.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; } @@ -886,4 +1370,5 @@ _initialize_gnu_v3_abi (void) init_gnuv3_ops (); register_cp_abi (&gnu_v3_abi_ops); + set_cp_abi_as_auto_default (gnu_v3_abi_ops.shortname); }