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- /* Support for printing C++ values for GDB, the GNU debugger.
- Copyright (C) 1986-2022 Free Software Foundation, Inc.
- 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 <http://www.gnu.org/licenses/>. */
- #include "defs.h"
- #include "gdbsupport/gdb_obstack.h"
- #include "symtab.h"
- #include "gdbtypes.h"
- #include "expression.h"
- #include "value.h"
- #include "command.h"
- #include "gdbcmd.h"
- #include "demangle.h"
- #include "annotate.h"
- #include "c-lang.h"
- #include "target.h"
- #include "cp-abi.h"
- #include "valprint.h"
- #include "cp-support.h"
- #include "language.h"
- #include "extension.h"
- #include "typeprint.h"
- #include "gdbsupport/byte-vector.h"
- #include "gdbarch.h"
- #include "cli/cli-style.h"
- #include "gdbsupport/selftest.h"
- #include "selftest-arch.h"
- static struct obstack dont_print_vb_obstack;
- static struct obstack dont_print_statmem_obstack;
- static struct obstack dont_print_stat_array_obstack;
- static void cp_print_static_field (struct type *, struct value *,
- struct ui_file *, int,
- const struct value_print_options *);
- static void cp_print_value (struct value *, struct ui_file *,
- int, const struct value_print_options *,
- struct type **);
- /* GCC versions after 2.4.5 use this. */
- const char vtbl_ptr_name[] = "__vtbl_ptr_type";
- /* Return truth value for assertion that TYPE is of the type
- "pointer to virtual function". */
- int
- cp_is_vtbl_ptr_type (struct type *type)
- {
- const char *type_name = type->name ();
- return (type_name != NULL && !strcmp (type_name, vtbl_ptr_name));
- }
- /* Return truth value for the assertion that TYPE is of the type
- "pointer to virtual function table". */
- int
- cp_is_vtbl_member (struct type *type)
- {
- /* With older versions of g++, the vtbl field pointed to an array of
- structures. Nowadays it points directly to the structure. */
- if (type->code () == TYPE_CODE_PTR)
- {
- type = TYPE_TARGET_TYPE (type);
- if (type->code () == TYPE_CODE_ARRAY)
- {
- type = TYPE_TARGET_TYPE (type);
- if (type->code () == TYPE_CODE_STRUCT /* if not using thunks */
- || type->code () == TYPE_CODE_PTR) /* if using thunks */
- {
- /* Virtual functions tables are full of pointers
- to virtual functions. */
- return cp_is_vtbl_ptr_type (type);
- }
- }
- else if (type->code () == TYPE_CODE_STRUCT) /* if not using thunks */
- {
- return cp_is_vtbl_ptr_type (type);
- }
- else if (type->code () == TYPE_CODE_PTR) /* if using thunks */
- {
- /* The type name of the thunk pointer is NULL when using
- dwarf2. We could test for a pointer to a function, but
- there is no type info for the virtual table either, so it
- wont help. */
- return cp_is_vtbl_ptr_type (type);
- }
- }
- return 0;
- }
- /* Mutually recursive subroutines of cp_print_value and c_val_print to
- print out a structure's fields: cp_print_value_fields and
- cp_print_value.
- TYPE, VALADDR, ADDRESS, STREAM, RECURSE, and OPTIONS have the same
- meanings as in cp_print_value and c_val_print.
- 2nd argument REAL_TYPE is used to carry over the type of the
- derived class across the recursion to base classes.
- DONT_PRINT is an array of baseclass types that we should not print,
- or zero if called from top level. */
- void
- cp_print_value_fields (struct value *val, struct ui_file *stream,
- int recurse, const struct value_print_options *options,
- struct type **dont_print_vb,
- int dont_print_statmem)
- {
- int i, len, n_baseclasses;
- int fields_seen = 0;
- static int last_set_recurse = -1;
- struct type *type = check_typedef (value_type (val));
- if (recurse == 0)
- {
- /* Any object can be left on obstacks only during an unexpected
- error. */
- if (obstack_object_size (&dont_print_statmem_obstack) > 0)
- {
- obstack_free (&dont_print_statmem_obstack, NULL);
- obstack_begin (&dont_print_statmem_obstack,
- 32 * sizeof (CORE_ADDR));
- }
- if (obstack_object_size (&dont_print_stat_array_obstack) > 0)
- {
- obstack_free (&dont_print_stat_array_obstack, NULL);
- obstack_begin (&dont_print_stat_array_obstack,
- 32 * sizeof (struct type *));
- }
- }
- gdb_printf (stream, "{");
- len = type->num_fields ();
- n_baseclasses = TYPE_N_BASECLASSES (type);
- /* First, print out baseclasses such that we don't print
- duplicates of virtual baseclasses. */
- if (n_baseclasses > 0)
- cp_print_value (val, stream, recurse + 1, options, dont_print_vb);
- /* Second, print out data fields */
- /* If there are no data fields, skip this part */
- if (len == n_baseclasses || !len)
- fprintf_styled (stream, metadata_style.style (), "<No data fields>");
- else
- {
- size_t statmem_obstack_initial_size = 0;
- size_t stat_array_obstack_initial_size = 0;
- struct type *vptr_basetype = NULL;
- int vptr_fieldno;
- if (dont_print_statmem == 0)
- {
- statmem_obstack_initial_size =
- obstack_object_size (&dont_print_statmem_obstack);
- if (last_set_recurse != recurse)
- {
- stat_array_obstack_initial_size =
- obstack_object_size (&dont_print_stat_array_obstack);
- last_set_recurse = recurse;
- }
- }
- vptr_fieldno = get_vptr_fieldno (type, &vptr_basetype);
- for (i = n_baseclasses; i < len; i++)
- {
- const gdb_byte *valaddr = value_contents_for_printing (val).data ();
- /* If requested, skip printing of static fields. */
- if (!options->static_field_print
- && field_is_static (&type->field (i)))
- continue;
- if (fields_seen)
- {
- gdb_puts (",", stream);
- if (!options->prettyformat)
- gdb_puts (" ", stream);
- }
- else if (n_baseclasses > 0)
- {
- if (options->prettyformat)
- {
- gdb_printf (stream, "\n");
- print_spaces (2 + 2 * recurse, stream);
- gdb_puts ("members of ", stream);
- gdb_puts (type->name (), stream);
- gdb_puts (":", stream);
- }
- }
- fields_seen = 1;
- if (options->prettyformat)
- {
- gdb_printf (stream, "\n");
- print_spaces (2 + 2 * recurse, stream);
- }
- else
- {
- stream->wrap_here (2 + 2 * recurse);
- }
- annotate_field_begin (type->field (i).type ());
- if (field_is_static (&type->field (i)))
- {
- gdb_puts ("static ", stream);
- fprintf_symbol (stream,
- type->field (i).name (),
- current_language->la_language,
- DMGL_PARAMS | DMGL_ANSI);
- }
- else
- fputs_styled (type->field (i).name (),
- variable_name_style.style (), stream);
- annotate_field_name_end ();
- /* We tweak various options in a few cases below. */
- value_print_options options_copy = *options;
- value_print_options *opts = &options_copy;
- /* Do not print leading '=' in case of anonymous
- unions. */
- if (strcmp (type->field (i).name (), ""))
- gdb_puts (" = ", stream);
- else
- {
- /* If this is an anonymous field then we want to consider it
- as though it is at its parent's depth when it comes to the
- max print depth. */
- if (opts->max_depth != -1 && opts->max_depth < INT_MAX)
- ++opts->max_depth;
- }
- annotate_field_value ();
- if (!field_is_static (&type->field (i))
- && TYPE_FIELD_PACKED (type, i))
- {
- struct value *v;
- /* Bitfields require special handling, especially due to
- byte order problems. */
- if (TYPE_FIELD_IGNORE (type, i))
- {
- fputs_styled ("<optimized out or zero length>",
- metadata_style.style (), stream);
- }
- else if (value_bits_synthetic_pointer
- (val, type->field (i).loc_bitpos (),
- TYPE_FIELD_BITSIZE (type, i)))
- {
- fputs_styled (_("<synthetic pointer>"),
- metadata_style.style (), stream);
- }
- else
- {
- opts->deref_ref = 0;
- v = value_field_bitfield (type, i, valaddr,
- value_embedded_offset (val), val);
- common_val_print (v, stream, recurse + 1,
- opts, current_language);
- }
- }
- else
- {
- if (TYPE_FIELD_IGNORE (type, i))
- {
- fputs_styled ("<optimized out or zero length>",
- metadata_style.style (), stream);
- }
- else if (field_is_static (&type->field (i)))
- {
- try
- {
- struct value *v = value_static_field (type, i);
- cp_print_static_field (type->field (i).type (),
- v, stream, recurse + 1,
- opts);
- }
- catch (const gdb_exception_error &ex)
- {
- fprintf_styled (stream, metadata_style.style (),
- _("<error reading variable: %s>"),
- ex.what ());
- }
- }
- else if (i == vptr_fieldno && type == vptr_basetype)
- {
- int i_offset = type->field (i).loc_bitpos () / 8;
- struct type *i_type = type->field (i).type ();
- if (valprint_check_validity (stream, i_type, i_offset, val))
- {
- CORE_ADDR addr;
- i_offset += value_embedded_offset (val);
- addr = extract_typed_address (valaddr + i_offset, i_type);
- print_function_pointer_address (opts,
- type->arch (),
- addr, stream);
- }
- }
- else
- {
- struct value *v = value_primitive_field (val, 0, i, type);
- opts->deref_ref = 0;
- common_val_print (v, stream, recurse + 1, opts,
- current_language);
- }
- }
- annotate_field_end ();
- }
- if (dont_print_statmem == 0)
- {
- size_t obstack_final_size =
- obstack_object_size (&dont_print_statmem_obstack);
- if (obstack_final_size > statmem_obstack_initial_size)
- {
- /* In effect, a pop of the printed-statics stack. */
- size_t shrink_bytes
- = statmem_obstack_initial_size - obstack_final_size;
- obstack_blank_fast (&dont_print_statmem_obstack, shrink_bytes);
- }
- if (last_set_recurse != recurse)
- {
- obstack_final_size =
- obstack_object_size (&dont_print_stat_array_obstack);
- if (obstack_final_size > stat_array_obstack_initial_size)
- {
- void *free_to_ptr =
- (char *) obstack_next_free (&dont_print_stat_array_obstack)
- - (obstack_final_size
- - stat_array_obstack_initial_size);
- obstack_free (&dont_print_stat_array_obstack,
- free_to_ptr);
- }
- last_set_recurse = -1;
- }
- }
- if (options->prettyformat)
- {
- gdb_printf (stream, "\n");
- print_spaces (2 * recurse, stream);
- }
- } /* if there are data fields */
- gdb_printf (stream, "}");
- }
- /* Special val_print routine to avoid printing multiple copies of
- virtual baseclasses. */
- static void
- cp_print_value (struct value *val, struct ui_file *stream,
- int recurse, const struct value_print_options *options,
- struct type **dont_print_vb)
- {
- struct type *type = check_typedef (value_type (val));
- CORE_ADDR address = value_address (val);
- struct type **last_dont_print
- = (struct type **) obstack_next_free (&dont_print_vb_obstack);
- struct obstack tmp_obstack = dont_print_vb_obstack;
- int i, n_baseclasses = TYPE_N_BASECLASSES (type);
- const gdb_byte *valaddr = value_contents_for_printing (val).data ();
- if (dont_print_vb == 0)
- {
- /* If we're at top level, carve out a completely fresh chunk of
- the obstack and use that until this particular invocation
- returns. */
- /* Bump up the high-water mark. Now alpha is omega. */
- obstack_finish (&dont_print_vb_obstack);
- }
- for (i = 0; i < n_baseclasses; i++)
- {
- LONGEST boffset = 0;
- int skip = 0;
- struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i));
- const char *basename = baseclass->name ();
- struct value *base_val = NULL;
- if (BASETYPE_VIA_VIRTUAL (type, i))
- {
- struct type **first_dont_print
- = (struct type **) obstack_base (&dont_print_vb_obstack);
- int j = (struct type **)
- obstack_next_free (&dont_print_vb_obstack) - first_dont_print;
- while (--j >= 0)
- if (baseclass == first_dont_print[j])
- goto flush_it;
- obstack_ptr_grow (&dont_print_vb_obstack, baseclass);
- }
- try
- {
- boffset = baseclass_offset (type, i, valaddr,
- value_embedded_offset (val),
- address, val);
- }
- catch (const gdb_exception_error &ex)
- {
- if (ex.error == NOT_AVAILABLE_ERROR)
- skip = -1;
- else
- skip = 1;
- }
- if (skip == 0)
- {
- if (BASETYPE_VIA_VIRTUAL (type, i))
- {
- /* The virtual base class pointer might have been
- clobbered by the user program. Make sure that it
- still points to a valid memory location. */
- if (boffset < 0 || boffset >= TYPE_LENGTH (type))
- {
- gdb::byte_vector buf (TYPE_LENGTH (baseclass));
- if (target_read_memory (address + boffset, buf.data (),
- TYPE_LENGTH (baseclass)) != 0)
- skip = 1;
- base_val = value_from_contents_and_address (baseclass,
- buf.data (),
- address + boffset);
- baseclass = value_type (base_val);
- boffset = 0;
- }
- else
- {
- base_val = val;
- }
- }
- else
- {
- base_val = val;
- }
- }
- /* Now do the printing. */
- if (options->prettyformat)
- {
- gdb_printf (stream, "\n");
- print_spaces (2 * recurse, stream);
- }
- gdb_puts ("<", stream);
- /* Not sure what the best notation is in the case where there is
- no baseclass name. */
- gdb_puts (basename ? basename : "", stream);
- gdb_puts ("> = ", stream);
- if (skip < 0)
- val_print_unavailable (stream);
- else if (skip > 0)
- val_print_invalid_address (stream);
- else
- {
- int result = 0;
- if (!val_print_check_max_depth (stream, recurse, options,
- current_language))
- {
- struct value *baseclass_val = value_primitive_field (val, 0,
- i, type);
- /* Attempt to run an extension language pretty-printer on the
- baseclass if possible. */
- if (!options->raw)
- result
- = apply_ext_lang_val_pretty_printer (baseclass_val, stream,
- recurse, options,
- current_language);
- if (!result)
- cp_print_value_fields (baseclass_val, stream, recurse, options,
- ((struct type **)
- obstack_base (&dont_print_vb_obstack)),
- 0);
- }
- }
- gdb_puts (", ", stream);
- flush_it:
- ;
- }
- if (dont_print_vb == 0)
- {
- /* Free the space used to deal with the printing
- of this type from top level. */
- obstack_free (&dont_print_vb_obstack, last_dont_print);
- /* Reset watermark so that we can continue protecting
- ourselves from whatever we were protecting ourselves. */
- dont_print_vb_obstack = tmp_obstack;
- }
- }
- /* Print value of a static member. To avoid infinite recursion when
- printing a class that contains a static instance of the class, we
- keep the addresses of all printed static member classes in an
- obstack and refuse to print them more than once.
- VAL contains the value to print, TYPE, STREAM, RECURSE, and OPTIONS
- have the same meanings as in c_val_print. */
- static void
- cp_print_static_field (struct type *type,
- struct value *val,
- struct ui_file *stream,
- int recurse,
- const struct value_print_options *options)
- {
- struct value_print_options opts;
- if (value_entirely_optimized_out (val))
- {
- val_print_optimized_out (val, stream);
- return;
- }
- struct type *real_type = check_typedef (type);
- if (real_type->code () == TYPE_CODE_STRUCT)
- {
- CORE_ADDR *first_dont_print;
- CORE_ADDR addr = value_address (val);
- int i;
- first_dont_print
- = (CORE_ADDR *) obstack_base (&dont_print_statmem_obstack);
- i = obstack_object_size (&dont_print_statmem_obstack)
- / sizeof (CORE_ADDR);
- while (--i >= 0)
- {
- if (addr == first_dont_print[i])
- {
- fputs_styled (_("<same as static member of an already"
- " seen type>"),
- metadata_style.style (), stream);
- return;
- }
- }
- obstack_grow (&dont_print_statmem_obstack, (char *) &addr,
- sizeof (CORE_ADDR));
- cp_print_value_fields (val, stream, recurse, options, NULL, 1);
- return;
- }
- if (real_type->code () == TYPE_CODE_ARRAY)
- {
- struct type **first_dont_print;
- int i;
- struct type *target_type = TYPE_TARGET_TYPE (type);
- first_dont_print
- = (struct type **) obstack_base (&dont_print_stat_array_obstack);
- i = obstack_object_size (&dont_print_stat_array_obstack)
- / sizeof (struct type *);
- while (--i >= 0)
- {
- if (target_type == first_dont_print[i])
- {
- fputs_styled (_("<same as static member of an already"
- " seen type>"),
- metadata_style.style (), stream);
- return;
- }
- }
- obstack_grow (&dont_print_stat_array_obstack,
- (char *) &target_type,
- sizeof (struct type *));
- }
- opts = *options;
- opts.deref_ref = 0;
- common_val_print (val, stream, recurse, &opts, current_language);
- }
- /* Find the field in *SELF, or its non-virtual base classes, with
- bit offset OFFSET. Set *SELF to the containing type and *FIELDNO
- to the containing field number. If OFFSET is not exactly at the
- start of some field, set *SELF to NULL. */
- static void
- cp_find_class_member (struct type **self_p, int *fieldno,
- LONGEST offset)
- {
- struct type *self;
- unsigned int i;
- unsigned len;
- *self_p = check_typedef (*self_p);
- self = *self_p;
- len = self->num_fields ();
- for (i = TYPE_N_BASECLASSES (self); i < len; i++)
- {
- LONGEST bitpos = self->field (i).loc_bitpos ();
- QUIT;
- if (offset == bitpos)
- {
- *fieldno = i;
- return;
- }
- }
- for (i = 0; i < TYPE_N_BASECLASSES (self); i++)
- {
- LONGEST bitpos = self->field (i).loc_bitpos ();
- LONGEST bitsize = 8 * TYPE_LENGTH (self->field (i).type ());
- if (offset >= bitpos && offset < bitpos + bitsize)
- {
- *self_p = self->field (i).type ();
- cp_find_class_member (self_p, fieldno, offset - bitpos);
- return;
- }
- }
- *self_p = NULL;
- }
- void
- cp_print_class_member (const gdb_byte *valaddr, struct type *type,
- struct ui_file *stream, const char *prefix)
- {
- enum bfd_endian byte_order = type_byte_order (type);
- /* VAL is a byte offset into the structure type SELF_TYPE.
- Find the name of the field for that offset and
- print it. */
- struct type *self_type = TYPE_SELF_TYPE (type);
- LONGEST val;
- int fieldno;
- val = extract_signed_integer (valaddr,
- TYPE_LENGTH (type),
- byte_order);
- /* Pointers to data members are usually byte offsets into an object.
- Because a data member can have offset zero, and a NULL pointer to
- member must be distinct from any valid non-NULL pointer to
- member, either the value is biased or the NULL value has a
- special representation; both are permitted by ISO C++. HP aCC
- used a bias of 0x20000000; HP cfront used a bias of 1; g++ 3.x
- and other compilers which use the Itanium ABI use -1 as the NULL
- value. GDB only supports that last form; to add support for
- another form, make this into a cp-abi hook. */
- if (val == -1)
- {
- gdb_printf (stream, "NULL");
- return;
- }
- cp_find_class_member (&self_type, &fieldno, val << 3);
- if (self_type != NULL)
- {
- const char *name;
- gdb_puts (prefix, stream);
- name = self_type->name ();
- if (name)
- gdb_puts (name, stream);
- else
- c_type_print_base (self_type, stream, 0, 0, &type_print_raw_options);
- gdb_printf (stream, "::");
- fputs_styled (self_type->field (fieldno).name (),
- variable_name_style.style (), stream);
- }
- else
- gdb_printf (stream, "%ld", (long) val);
- }
- #if GDB_SELF_TEST
- /* Test printing of TYPE_CODE_STRUCT values. */
- static void
- test_print_fields (gdbarch *arch)
- {
- struct field *f;
- type *uint8_type = builtin_type (arch)->builtin_uint8;
- type *bool_type = builtin_type (arch)->builtin_bool;
- type *the_struct = arch_composite_type (arch, NULL, TYPE_CODE_STRUCT);
- TYPE_LENGTH (the_struct) = 4;
- /* Value: 1110 1001
- Fields: C-BB B-A- */
- if (gdbarch_byte_order (arch) == BFD_ENDIAN_LITTLE)
- {
- f = append_composite_type_field_raw (the_struct, "A", bool_type);
- f->set_loc_bitpos (1);
- FIELD_BITSIZE (*f) = 1;
- f = append_composite_type_field_raw (the_struct, "B", uint8_type);
- f->set_loc_bitpos (3);
- FIELD_BITSIZE (*f) = 3;
- f = append_composite_type_field_raw (the_struct, "C", bool_type);
- f->set_loc_bitpos (7);
- FIELD_BITSIZE (*f) = 1;
- }
- /* According to the logic commented in "make_gdb_type_struct ()" of
- * target-descriptions.c, bit positions are numbered differently for
- * little and big endians. */
- else
- {
- f = append_composite_type_field_raw (the_struct, "A", bool_type);
- f->set_loc_bitpos (30);
- FIELD_BITSIZE (*f) = 1;
- f = append_composite_type_field_raw (the_struct, "B", uint8_type);
- f->set_loc_bitpos (26);
- FIELD_BITSIZE (*f) = 3;
- f = append_composite_type_field_raw (the_struct, "C", bool_type);
- f->set_loc_bitpos (24);
- FIELD_BITSIZE (*f) = 1;
- }
- value *val = allocate_value (the_struct);
- gdb_byte *contents = value_contents_writeable (val).data ();
- store_unsigned_integer (contents, TYPE_LENGTH (value_enclosing_type (val)),
- gdbarch_byte_order (arch), 0xe9);
- string_file out;
- struct value_print_options opts;
- get_no_prettyformat_print_options (&opts);
- cp_print_value_fields(val, &out, 0, &opts, NULL, 0);
- SELF_CHECK (out.string () == "{A = false, B = 5, C = true}");
- out.clear();
- opts.format = 'x';
- cp_print_value_fields(val, &out, 0, &opts, NULL, 0);
- SELF_CHECK (out.string () == "{A = 0x0, B = 0x5, C = 0x1}");
- }
- #endif
- void _initialize_cp_valprint ();
- void
- _initialize_cp_valprint ()
- {
- #if GDB_SELF_TEST
- selftests::register_test_foreach_arch ("print-fields", test_print_fields);
- #endif
- obstack_begin (&dont_print_stat_array_obstack,
- 32 * sizeof (struct type *));
- obstack_begin (&dont_print_statmem_obstack,
- 32 * sizeof (CORE_ADDR));
- obstack_begin (&dont_print_vb_obstack,
- 32 * sizeof (struct type *));
- }
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