| /* Support for printing C values for GDB, the GNU debugger. |
| |
| Copyright (C) 1986, 1988-1989, 1991-2001, 2003, 2005-2012 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 "gdb_string.h" |
| #include "symtab.h" |
| #include "gdbtypes.h" |
| #include "expression.h" |
| #include "value.h" |
| #include "valprint.h" |
| #include "language.h" |
| #include "c-lang.h" |
| #include "cp-abi.h" |
| #include "target.h" |
| |
| |
| /* A helper for c_textual_element_type. This checks the name of the |
| typedef. This is bogus but it isn't apparent that the compiler |
| provides us the help we may need. */ |
| |
| static int |
| textual_name (const char *name) |
| { |
| return (!strcmp (name, "wchar_t") |
| || !strcmp (name, "char16_t") |
| || !strcmp (name, "char32_t")); |
| } |
| |
| /* Apply a heuristic to decide whether an array of TYPE or a pointer |
| to TYPE should be printed as a textual string. Return non-zero if |
| it should, or zero if it should be treated as an array of integers |
| or pointer to integers. FORMAT is the current format letter, or 0 |
| if none. |
| |
| We guess that "char" is a character. Explicitly signed and |
| unsigned character types are also characters. Integer data from |
| vector types is not. The user can override this by using the /s |
| format letter. */ |
| |
| int |
| c_textual_element_type (struct type *type, char format) |
| { |
| struct type *true_type, *iter_type; |
| |
| if (format != 0 && format != 's') |
| return 0; |
| |
| /* We also rely on this for its side effect of setting up all the |
| typedef pointers. */ |
| true_type = check_typedef (type); |
| |
| /* TYPE_CODE_CHAR is always textual. */ |
| if (TYPE_CODE (true_type) == TYPE_CODE_CHAR) |
| return 1; |
| |
| /* Any other character-like types must be integral. */ |
| if (TYPE_CODE (true_type) != TYPE_CODE_INT) |
| return 0; |
| |
| /* We peel typedefs one by one, looking for a match. */ |
| iter_type = type; |
| while (iter_type) |
| { |
| /* Check the name of the type. */ |
| if (TYPE_NAME (iter_type) && textual_name (TYPE_NAME (iter_type))) |
| return 1; |
| |
| if (TYPE_CODE (iter_type) != TYPE_CODE_TYPEDEF) |
| break; |
| |
| /* Peel a single typedef. If the typedef doesn't have a target |
| type, we use check_typedef and hope the result is ok -- it |
| might be for C++, where wchar_t is a built-in type. */ |
| if (TYPE_TARGET_TYPE (iter_type)) |
| iter_type = TYPE_TARGET_TYPE (iter_type); |
| else |
| iter_type = check_typedef (iter_type); |
| } |
| |
| if (format == 's') |
| { |
| /* Print this as a string if we can manage it. For now, no wide |
| character support. */ |
| if (TYPE_CODE (true_type) == TYPE_CODE_INT |
| && TYPE_LENGTH (true_type) == 1) |
| return 1; |
| } |
| else |
| { |
| /* If a one-byte TYPE_CODE_INT is missing the not-a-character |
| flag, then we treat it as text; otherwise, we assume it's |
| being used as data. */ |
| if (TYPE_CODE (true_type) == TYPE_CODE_INT |
| && TYPE_LENGTH (true_type) == 1 |
| && !TYPE_NOTTEXT (true_type)) |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| /* Decorations for C. */ |
| |
| static const struct generic_val_print_decorations c_decorations = |
| { |
| "", |
| " + ", |
| " * I", |
| "true", |
| "false", |
| "void" |
| }; |
| |
| /* See val_print for a description of the various parameters of this |
| function; they are identical. */ |
| |
| void |
| c_val_print (struct type *type, const gdb_byte *valaddr, |
| int embedded_offset, CORE_ADDR address, |
| struct ui_file *stream, int recurse, |
| const struct value *original_value, |
| const struct value_print_options *options) |
| { |
| struct gdbarch *gdbarch = get_type_arch (type); |
| enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| unsigned int i = 0; /* Number of characters printed. */ |
| unsigned len; |
| struct type *elttype, *unresolved_elttype; |
| struct type *unresolved_type = type; |
| unsigned eltlen; |
| CORE_ADDR addr; |
| |
| CHECK_TYPEDEF (type); |
| switch (TYPE_CODE (type)) |
| { |
| case TYPE_CODE_ARRAY: |
| unresolved_elttype = TYPE_TARGET_TYPE (type); |
| elttype = check_typedef (unresolved_elttype); |
| if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (unresolved_elttype) > 0) |
| { |
| LONGEST low_bound, high_bound; |
| |
| if (!get_array_bounds (type, &low_bound, &high_bound)) |
| error (_("Could not determine the array high bound")); |
| |
| eltlen = TYPE_LENGTH (elttype); |
| len = high_bound - low_bound + 1; |
| if (options->prettyprint_arrays) |
| { |
| print_spaces_filtered (2 + 2 * recurse, stream); |
| } |
| |
| /* Print arrays of textual chars with a string syntax, as |
| long as the entire array is valid. */ |
| if (c_textual_element_type (unresolved_elttype, |
| options->format) |
| && value_bytes_available (original_value, embedded_offset, |
| TYPE_LENGTH (type)) |
| && value_bits_valid (original_value, |
| TARGET_CHAR_BIT * embedded_offset, |
| TARGET_CHAR_BIT * TYPE_LENGTH (type))) |
| { |
| /* If requested, look for the first null char and only |
| print elements up to it. */ |
| if (options->stop_print_at_null) |
| { |
| unsigned int temp_len; |
| |
| for (temp_len = 0; |
| (temp_len < len |
| && temp_len < options->print_max |
| && extract_unsigned_integer (valaddr + embedded_offset |
| + temp_len * eltlen, |
| eltlen, byte_order) != 0); |
| ++temp_len) |
| ; |
| len = temp_len; |
| } |
| |
| LA_PRINT_STRING (stream, unresolved_elttype, |
| valaddr + embedded_offset, len, |
| NULL, 0, options); |
| i = len; |
| } |
| else |
| { |
| fprintf_filtered (stream, "{"); |
| /* If this is a virtual function table, print the 0th |
| entry specially, and the rest of the members |
| normally. */ |
| if (cp_is_vtbl_ptr_type (elttype)) |
| { |
| i = 1; |
| fprintf_filtered (stream, _("%d vtable entries"), |
| len - 1); |
| } |
| else |
| { |
| i = 0; |
| } |
| val_print_array_elements (type, valaddr, embedded_offset, |
| address, stream, |
| recurse, original_value, options, i); |
| fprintf_filtered (stream, "}"); |
| } |
| break; |
| } |
| /* Array of unspecified length: treat like pointer to first |
| elt. */ |
| addr = address + embedded_offset; |
| goto print_unpacked_pointer; |
| |
| case TYPE_CODE_METHODPTR: |
| cplus_print_method_ptr (valaddr + embedded_offset, type, stream); |
| break; |
| |
| case TYPE_CODE_PTR: |
| if (options->format && options->format != 's') |
| { |
| val_print_scalar_formatted (type, valaddr, embedded_offset, |
| original_value, options, 0, stream); |
| break; |
| } |
| if (options->vtblprint && cp_is_vtbl_ptr_type (type)) |
| { |
| /* Print the unmangled name if desired. */ |
| /* Print vtable entry - we only get here if we ARE using |
| -fvtable_thunks. (Otherwise, look under |
| TYPE_CODE_STRUCT.) */ |
| CORE_ADDR addr |
| = extract_typed_address (valaddr + embedded_offset, type); |
| |
| print_function_pointer_address (options, gdbarch, addr, stream); |
| break; |
| } |
| unresolved_elttype = TYPE_TARGET_TYPE (type); |
| elttype = check_typedef (unresolved_elttype); |
| { |
| int want_space; |
| |
| addr = unpack_pointer (type, valaddr + embedded_offset); |
| print_unpacked_pointer: |
| |
| want_space = 0; |
| |
| if (TYPE_CODE (elttype) == TYPE_CODE_FUNC) |
| { |
| /* Try to print what function it points to. */ |
| print_function_pointer_address (options, gdbarch, addr, stream); |
| return; |
| } |
| |
| if (options->symbol_print) |
| want_space = print_address_demangle (options, gdbarch, addr, |
| stream, demangle); |
| else if (options->addressprint) |
| { |
| fputs_filtered (paddress (gdbarch, addr), stream); |
| want_space = 1; |
| } |
| |
| /* For a pointer to a textual type, also print the string |
| pointed to, unless pointer is null. */ |
| |
| if (c_textual_element_type (unresolved_elttype, |
| options->format) |
| && addr != 0) |
| { |
| if (want_space) |
| fputs_filtered (" ", stream); |
| i = val_print_string (unresolved_elttype, NULL, |
| addr, -1, |
| stream, options); |
| } |
| else if (cp_is_vtbl_member (type)) |
| { |
| /* Print vtbl's nicely. */ |
| CORE_ADDR vt_address = unpack_pointer (type, |
| valaddr |
| + embedded_offset); |
| struct minimal_symbol *msymbol = |
| lookup_minimal_symbol_by_pc (vt_address); |
| |
| /* If 'symbol_print' is set, we did the work above. */ |
| if (!options->symbol_print |
| && (msymbol != NULL) |
| && (vt_address == SYMBOL_VALUE_ADDRESS (msymbol))) |
| { |
| if (want_space) |
| fputs_filtered (" ", stream); |
| fputs_filtered (" <", stream); |
| fputs_filtered (SYMBOL_PRINT_NAME (msymbol), stream); |
| fputs_filtered (">", stream); |
| want_space = 1; |
| } |
| |
| if (vt_address && options->vtblprint) |
| { |
| struct value *vt_val; |
| struct symbol *wsym = (struct symbol *) NULL; |
| struct type *wtype; |
| struct block *block = (struct block *) NULL; |
| int is_this_fld; |
| |
| if (want_space) |
| fputs_filtered (" ", stream); |
| |
| if (msymbol != NULL) |
| wsym = lookup_symbol (SYMBOL_LINKAGE_NAME (msymbol), |
| block, VAR_DOMAIN, |
| &is_this_fld); |
| |
| if (wsym) |
| { |
| wtype = SYMBOL_TYPE (wsym); |
| } |
| else |
| { |
| wtype = unresolved_elttype; |
| } |
| vt_val = value_at (wtype, vt_address); |
| common_val_print (vt_val, stream, recurse + 1, |
| options, current_language); |
| if (options->pretty) |
| { |
| fprintf_filtered (stream, "\n"); |
| print_spaces_filtered (2 + 2 * recurse, stream); |
| } |
| } |
| } |
| return; |
| } |
| break; |
| |
| case TYPE_CODE_UNION: |
| if (recurse && !options->unionprint) |
| { |
| fprintf_filtered (stream, "{...}"); |
| break; |
| } |
| /* Fall through. */ |
| case TYPE_CODE_STRUCT: |
| /*FIXME: Abstract this away. */ |
| if (options->vtblprint && cp_is_vtbl_ptr_type (type)) |
| { |
| /* Print the unmangled name if desired. */ |
| /* Print vtable entry - we only get here if NOT using |
| -fvtable_thunks. (Otherwise, look under |
| TYPE_CODE_PTR.) */ |
| int offset = (embedded_offset |
| + TYPE_FIELD_BITPOS (type, |
| VTBL_FNADDR_OFFSET) / 8); |
| struct type *field_type = TYPE_FIELD_TYPE (type, |
| VTBL_FNADDR_OFFSET); |
| CORE_ADDR addr |
| = extract_typed_address (valaddr + offset, field_type); |
| |
| print_function_pointer_address (options, gdbarch, addr, stream); |
| } |
| else |
| cp_print_value_fields_rtti (type, valaddr, |
| embedded_offset, address, |
| stream, recurse, |
| original_value, options, |
| NULL, 0); |
| break; |
| |
| case TYPE_CODE_INT: |
| if (options->format || options->output_format) |
| { |
| struct value_print_options opts = *options; |
| |
| opts.format = (options->format ? options->format |
| : options->output_format); |
| val_print_scalar_formatted (type, valaddr, embedded_offset, |
| original_value, &opts, 0, stream); |
| } |
| else |
| { |
| val_print_type_code_int (type, valaddr + embedded_offset, |
| stream); |
| /* C and C++ has no single byte int type, char is used |
| instead. Since we don't know whether the value is really |
| intended to be used as an integer or a character, print |
| the character equivalent as well. */ |
| if (c_textual_element_type (unresolved_type, options->format)) |
| { |
| fputs_filtered (" ", stream); |
| LA_PRINT_CHAR (unpack_long (type, valaddr + embedded_offset), |
| unresolved_type, stream); |
| } |
| } |
| break; |
| |
| case TYPE_CODE_MEMBERPTR: |
| if (!options->format) |
| { |
| cp_print_class_member (valaddr + embedded_offset, type, stream, "&"); |
| break; |
| } |
| /* FALLTHROUGH */ |
| |
| case TYPE_CODE_REF: |
| case TYPE_CODE_ENUM: |
| case TYPE_CODE_FLAGS: |
| case TYPE_CODE_FUNC: |
| case TYPE_CODE_METHOD: |
| case TYPE_CODE_BOOL: |
| case TYPE_CODE_RANGE: |
| case TYPE_CODE_FLT: |
| case TYPE_CODE_DECFLOAT: |
| case TYPE_CODE_VOID: |
| case TYPE_CODE_ERROR: |
| case TYPE_CODE_UNDEF: |
| case TYPE_CODE_COMPLEX: |
| case TYPE_CODE_CHAR: |
| default: |
| generic_val_print (type, valaddr, embedded_offset, address, |
| stream, recurse, original_value, options, |
| &c_decorations); |
| break; |
| } |
| gdb_flush (stream); |
| } |
| |
| void |
| c_value_print (struct value *val, struct ui_file *stream, |
| const struct value_print_options *options) |
| { |
| struct type *type, *real_type, *val_type; |
| int full, top, using_enc; |
| struct value_print_options opts = *options; |
| |
| opts.deref_ref = 1; |
| |
| /* If it is a pointer, indicate what it points to. |
| |
| Print type also if it is a reference. |
| |
| C++: if it is a member pointer, we will take care |
| of that when we print it. */ |
| |
| /* Preserve the original type before stripping typedefs. We prefer |
| to pass down the original type when possible, but for local |
| checks it is better to look past the typedefs. */ |
| val_type = value_type (val); |
| type = check_typedef (val_type); |
| |
| if (TYPE_CODE (type) == TYPE_CODE_PTR |
| || TYPE_CODE (type) == TYPE_CODE_REF) |
| { |
| /* Hack: remove (char *) for char strings. Their |
| type is indicated by the quoted string anyway. |
| (Don't use c_textual_element_type here; quoted strings |
| are always exactly (char *), (wchar_t *), or the like. */ |
| if (TYPE_CODE (val_type) == TYPE_CODE_PTR |
| && TYPE_NAME (val_type) == NULL |
| && TYPE_NAME (TYPE_TARGET_TYPE (val_type)) != NULL |
| && (strcmp (TYPE_NAME (TYPE_TARGET_TYPE (val_type)), |
| "char") == 0 |
| || textual_name (TYPE_NAME (TYPE_TARGET_TYPE (val_type))))) |
| { |
| /* Print nothing. */ |
| } |
| else if (options->objectprint |
| && (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_CLASS)) |
| { |
| |
| if (TYPE_CODE(type) == TYPE_CODE_REF) |
| { |
| /* Copy value, change to pointer, so we don't get an |
| error about a non-pointer type in |
| value_rtti_target_type. */ |
| struct value *temparg; |
| temparg=value_copy(val); |
| deprecated_set_value_type |
| (temparg, lookup_pointer_type (TYPE_TARGET_TYPE (type))); |
| val = temparg; |
| } |
| /* Pointer to class, check real type of object. */ |
| fprintf_filtered (stream, "("); |
| |
| if (value_entirely_available (val)) |
| { |
| real_type = value_rtti_indirect_type (val, &full, &top, |
| &using_enc); |
| if (real_type) |
| { |
| /* RTTI entry found. */ |
| type = real_type; |
| |
| /* Need to adjust pointer value. */ |
| val = value_from_pointer (type, value_as_address (val) - top); |
| |
| /* Note: When we look up RTTI entries, we don't get |
| any information on const or volatile |
| attributes. */ |
| } |
| } |
| type_print (type, "", stream, -1); |
| fprintf_filtered (stream, ") "); |
| val_type = type; |
| } |
| else |
| { |
| /* normal case */ |
| fprintf_filtered (stream, "("); |
| type_print (value_type (val), "", stream, -1); |
| fprintf_filtered (stream, ") "); |
| } |
| } |
| |
| if (!value_initialized (val)) |
| fprintf_filtered (stream, " [uninitialized] "); |
| |
| if (options->objectprint && (TYPE_CODE (type) == TYPE_CODE_CLASS)) |
| { |
| /* Attempt to determine real type of object. */ |
| real_type = value_rtti_type (val, &full, &top, &using_enc); |
| if (real_type) |
| { |
| /* We have RTTI information, so use it. */ |
| val = value_full_object (val, real_type, |
| full, top, using_enc); |
| fprintf_filtered (stream, "(%s%s) ", |
| TYPE_NAME (real_type), |
| full ? "" : _(" [incomplete object]")); |
| /* Print out object: enclosing type is same as real_type if |
| full. */ |
| val_print (value_enclosing_type (val), |
| value_contents_for_printing (val), 0, |
| value_address (val), stream, 0, |
| val, &opts, current_language); |
| return; |
| /* Note: When we look up RTTI entries, we don't get any |
| information on const or volatile attributes. */ |
| } |
| else if (type != check_typedef (value_enclosing_type (val))) |
| { |
| /* No RTTI information, so let's do our best. */ |
| fprintf_filtered (stream, "(%s ?) ", |
| TYPE_NAME (value_enclosing_type (val))); |
| val_print (value_enclosing_type (val), |
| value_contents_for_printing (val), 0, |
| value_address (val), stream, 0, |
| val, &opts, current_language); |
| return; |
| } |
| /* Otherwise, we end up at the return outside this "if". */ |
| } |
| |
| val_print (val_type, value_contents_for_printing (val), |
| value_embedded_offset (val), |
| value_address (val), |
| stream, 0, |
| val, &opts, current_language); |
| } |
