| /* Support for printing C values for GDB, the GNU debugger. |
| |
| Copyright (C) 1986, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, |
| 1997, 1998, 1999, 2000, 2001, 2003, 2005, 2006 |
| 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 2 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, write to the Free Software |
| Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| Boston, MA 02110-1301, USA. */ |
| |
| #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" |
| |
| |
| /* Print function pointer with inferior address ADDRESS onto stdio |
| stream STREAM. */ |
| |
| static void |
| print_function_pointer_address (CORE_ADDR address, struct ui_file *stream) |
| { |
| CORE_ADDR func_addr = gdbarch_convert_from_func_ptr_addr (current_gdbarch, |
| address, |
| ¤t_target); |
| |
| /* If the function pointer is represented by a description, print the |
| address of the description. */ |
| if (addressprint && func_addr != address) |
| { |
| fputs_filtered ("@", stream); |
| deprecated_print_address_numeric (address, 1, stream); |
| fputs_filtered (": ", stream); |
| } |
| print_address_demangle (func_addr, stream, demangle); |
| } |
| |
| |
| /* Print data of type TYPE located at VALADDR (within GDB), which came from |
| the inferior at address ADDRESS, onto stdio stream STREAM according to |
| FORMAT (a letter or 0 for natural format). The data at VALADDR is in |
| target byte order. |
| |
| If the data are a string pointer, returns the number of string characters |
| printed. |
| |
| If DEREF_REF is nonzero, then dereference references, otherwise just print |
| them like pointers. |
| |
| The PRETTY parameter controls prettyprinting. */ |
| |
| int |
| c_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset, |
| CORE_ADDR address, struct ui_file *stream, int format, |
| int deref_ref, int recurse, enum val_prettyprint pretty) |
| { |
| unsigned int i = 0; /* Number of characters printed */ |
| unsigned len; |
| struct type *elttype; |
| unsigned eltlen; |
| LONGEST val; |
| CORE_ADDR addr; |
| |
| CHECK_TYPEDEF (type); |
| switch (TYPE_CODE (type)) |
| { |
| case TYPE_CODE_ARRAY: |
| elttype = check_typedef (TYPE_TARGET_TYPE (type)); |
| if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0) |
| { |
| eltlen = TYPE_LENGTH (elttype); |
| len = TYPE_LENGTH (type) / eltlen; |
| if (prettyprint_arrays) |
| { |
| print_spaces_filtered (2 + 2 * recurse, stream); |
| } |
| /* For an array of chars, print with string syntax. */ |
| if (eltlen == 1 && |
| ((TYPE_CODE (elttype) == TYPE_CODE_INT) |
| || ((current_language->la_language == language_m2) |
| && (TYPE_CODE (elttype) == TYPE_CODE_CHAR))) |
| && (format == 0 || format == 's')) |
| { |
| /* If requested, look for the first null char and only print |
| elements up to it. */ |
| if (stop_print_at_null) |
| { |
| unsigned int temp_len; |
| |
| /* Look for a NULL char. */ |
| for (temp_len = 0; |
| (valaddr + embedded_offset)[temp_len] |
| && temp_len < len && temp_len < print_max; |
| temp_len++); |
| len = temp_len; |
| } |
| |
| LA_PRINT_STRING (stream, valaddr + embedded_offset, len, eltlen, 0); |
| 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, |
| format, deref_ref, recurse, pretty, i); |
| fprintf_filtered (stream, "}"); |
| } |
| break; |
| } |
| /* Array of unspecified length: treat like pointer to first elt. */ |
| addr = address; |
| goto print_unpacked_pointer; |
| |
| case TYPE_CODE_PTR: |
| if (format && format != 's') |
| { |
| print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream); |
| break; |
| } |
| if (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 (addr, stream); |
| break; |
| } |
| elttype = check_typedef (TYPE_TARGET_TYPE (type)); |
| if (TYPE_CODE (elttype) == TYPE_CODE_METHOD) |
| { |
| cp_print_class_method (valaddr + embedded_offset, type, stream); |
| } |
| else if (TYPE_CODE (elttype) == TYPE_CODE_MEMBER) |
| { |
| struct type *target_type, *domain_type; |
| |
| target_type = check_typedef (TYPE_TARGET_TYPE (type)); |
| domain_type = TYPE_DOMAIN_TYPE (target_type); |
| cp_print_class_member (valaddr + embedded_offset, domain_type, |
| stream, "&"); |
| } |
| else |
| { |
| addr = unpack_pointer (type, valaddr + embedded_offset); |
| print_unpacked_pointer: |
| |
| if (TYPE_CODE (elttype) == TYPE_CODE_FUNC) |
| { |
| /* Try to print what function it points to. */ |
| print_function_pointer_address (addr, stream); |
| /* Return value is irrelevant except for string pointers. */ |
| return (0); |
| } |
| |
| if (addressprint && format != 's') |
| { |
| deprecated_print_address_numeric (addr, 1, stream); |
| } |
| |
| /* For a pointer to char or unsigned char, also print the string |
| pointed to, unless pointer is null. */ |
| /* FIXME: need to handle wchar_t here... */ |
| |
| if (TYPE_LENGTH (elttype) == 1 |
| && TYPE_CODE (elttype) == TYPE_CODE_INT |
| && (format == 0 || format == 's') |
| && addr != 0) |
| { |
| i = val_print_string (addr, -1, TYPE_LENGTH (elttype), stream); |
| } |
| 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 ((msymbol != NULL) && |
| (vt_address == SYMBOL_VALUE_ADDRESS (msymbol))) |
| { |
| fputs_filtered (" <", stream); |
| fputs_filtered (SYMBOL_PRINT_NAME (msymbol), stream); |
| fputs_filtered (">", stream); |
| } |
| if (vt_address && 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 (msymbol != NULL) |
| wsym = lookup_symbol (DEPRECATED_SYMBOL_NAME (msymbol), block, |
| VAR_DOMAIN, &is_this_fld, NULL); |
| |
| if (wsym) |
| { |
| wtype = SYMBOL_TYPE (wsym); |
| } |
| else |
| { |
| wtype = TYPE_TARGET_TYPE (type); |
| } |
| vt_val = value_at (wtype, vt_address); |
| common_val_print (vt_val, stream, format, |
| deref_ref, recurse + 1, pretty); |
| if (pretty) |
| { |
| fprintf_filtered (stream, "\n"); |
| print_spaces_filtered (2 + 2 * recurse, stream); |
| } |
| } |
| } |
| |
| /* Return number of characters printed, including the terminating |
| '\0' if we reached the end. val_print_string takes care including |
| the terminating '\0' if necessary. */ |
| return i; |
| } |
| break; |
| |
| case TYPE_CODE_MEMBER: |
| error (_("not implemented: member type in c_val_print")); |
| break; |
| |
| case TYPE_CODE_REF: |
| elttype = check_typedef (TYPE_TARGET_TYPE (type)); |
| if (TYPE_CODE (elttype) == TYPE_CODE_MEMBER) |
| { |
| cp_print_class_member (valaddr + embedded_offset, |
| TYPE_DOMAIN_TYPE (elttype), |
| stream, ""); |
| break; |
| } |
| if (addressprint) |
| { |
| CORE_ADDR addr |
| = extract_typed_address (valaddr + embedded_offset, type); |
| fprintf_filtered (stream, "@"); |
| deprecated_print_address_numeric (addr, 1, stream); |
| if (deref_ref) |
| fputs_filtered (": ", stream); |
| } |
| /* De-reference the reference. */ |
| if (deref_ref) |
| { |
| if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF) |
| { |
| struct value *deref_val = |
| value_at |
| (TYPE_TARGET_TYPE (type), |
| unpack_pointer (lookup_pointer_type (builtin_type_void), |
| valaddr + embedded_offset)); |
| common_val_print (deref_val, stream, format, deref_ref, |
| recurse, pretty); |
| } |
| else |
| fputs_filtered ("???", stream); |
| } |
| break; |
| |
| case TYPE_CODE_UNION: |
| if (recurse && !unionprint) |
| { |
| fprintf_filtered (stream, "{...}"); |
| break; |
| } |
| /* Fall through. */ |
| case TYPE_CODE_STRUCT: |
| /*FIXME: Abstract this away */ |
| if (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 (addr, stream); |
| } |
| else |
| cp_print_value_fields (type, type, valaddr, embedded_offset, address, stream, format, |
| recurse, pretty, NULL, 0); |
| break; |
| |
| case TYPE_CODE_ENUM: |
| if (format) |
| { |
| print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream); |
| break; |
| } |
| len = TYPE_NFIELDS (type); |
| val = unpack_long (type, valaddr + embedded_offset); |
| for (i = 0; i < len; i++) |
| { |
| QUIT; |
| if (val == TYPE_FIELD_BITPOS (type, i)) |
| { |
| break; |
| } |
| } |
| if (i < len) |
| { |
| fputs_filtered (TYPE_FIELD_NAME (type, i), stream); |
| } |
| else |
| { |
| print_longest (stream, 'd', 0, val); |
| } |
| break; |
| |
| case TYPE_CODE_FLAGS: |
| if (format) |
| print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream); |
| else |
| val_print_type_code_flags (type, valaddr + embedded_offset, stream); |
| break; |
| |
| case TYPE_CODE_FUNC: |
| if (format) |
| { |
| print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream); |
| break; |
| } |
| /* FIXME, we should consider, at least for ANSI C language, eliminating |
| the distinction made between FUNCs and POINTERs to FUNCs. */ |
| fprintf_filtered (stream, "{"); |
| type_print (type, "", stream, -1); |
| fprintf_filtered (stream, "} "); |
| /* Try to print what function it points to, and its address. */ |
| print_address_demangle (address, stream, demangle); |
| break; |
| |
| case TYPE_CODE_BOOL: |
| format = format ? format : output_format; |
| if (format) |
| print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream); |
| else |
| { |
| val = unpack_long (type, valaddr + embedded_offset); |
| if (val == 0) |
| fputs_filtered ("false", stream); |
| else if (val == 1) |
| fputs_filtered ("true", stream); |
| else |
| print_longest (stream, 'd', 0, val); |
| } |
| break; |
| |
| case TYPE_CODE_RANGE: |
| /* FIXME: create_range_type does not set the unsigned bit in a |
| range type (I think it probably should copy it from the target |
| type), so we won't print values which are too large to |
| fit in a signed integer correctly. */ |
| /* FIXME: Doesn't handle ranges of enums correctly. (Can't just |
| print with the target type, though, because the size of our type |
| and the target type might differ). */ |
| /* FALLTHROUGH */ |
| |
| case TYPE_CODE_INT: |
| format = format ? format : output_format; |
| if (format) |
| { |
| print_scalar_formatted (valaddr + embedded_offset, type, format, 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 (TYPE_LENGTH (type) == 1) |
| { |
| fputs_filtered (" ", stream); |
| LA_PRINT_CHAR ((unsigned char) unpack_long (type, valaddr + embedded_offset), |
| stream); |
| } |
| } |
| break; |
| |
| case TYPE_CODE_CHAR: |
| format = format ? format : output_format; |
| if (format) |
| { |
| print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream); |
| } |
| else |
| { |
| val = unpack_long (type, valaddr + embedded_offset); |
| if (TYPE_UNSIGNED (type)) |
| fprintf_filtered (stream, "%u", (unsigned int) val); |
| else |
| fprintf_filtered (stream, "%d", (int) val); |
| fputs_filtered (" ", stream); |
| LA_PRINT_CHAR ((unsigned char) val, stream); |
| } |
| break; |
| |
| case TYPE_CODE_FLT: |
| if (format) |
| { |
| print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream); |
| } |
| else |
| { |
| print_floating (valaddr + embedded_offset, type, stream); |
| } |
| break; |
| |
| case TYPE_CODE_METHOD: |
| { |
| struct value *v = value_at (type, address); |
| cp_print_class_method (value_contents (value_addr (v)), |
| lookup_pointer_type (type), stream); |
| break; |
| } |
| |
| case TYPE_CODE_VOID: |
| fprintf_filtered (stream, "void"); |
| break; |
| |
| case TYPE_CODE_ERROR: |
| fprintf_filtered (stream, _("<error type>")); |
| break; |
| |
| case TYPE_CODE_UNDEF: |
| /* This happens (without TYPE_FLAG_STUB set) on systems which don't use |
| dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar" |
| and no complete type for struct foo in that file. */ |
| fprintf_filtered (stream, _("<incomplete type>")); |
| break; |
| |
| case TYPE_CODE_COMPLEX: |
| if (format) |
| print_scalar_formatted (valaddr + embedded_offset, |
| TYPE_TARGET_TYPE (type), |
| format, 0, stream); |
| else |
| print_floating (valaddr + embedded_offset, TYPE_TARGET_TYPE (type), |
| stream); |
| fprintf_filtered (stream, " + "); |
| if (format) |
| print_scalar_formatted (valaddr + embedded_offset |
| + TYPE_LENGTH (TYPE_TARGET_TYPE (type)), |
| TYPE_TARGET_TYPE (type), |
| format, 0, stream); |
| else |
| print_floating (valaddr + embedded_offset |
| + TYPE_LENGTH (TYPE_TARGET_TYPE (type)), |
| TYPE_TARGET_TYPE (type), |
| stream); |
| fprintf_filtered (stream, " * I"); |
| break; |
| |
| default: |
| error (_("Invalid C/C++ type code %d in symbol table."), TYPE_CODE (type)); |
| } |
| gdb_flush (stream); |
| return (0); |
| } |
| |
| int |
| c_value_print (struct value *val, struct ui_file *stream, int format, |
| enum val_prettyprint pretty) |
| { |
| struct type *type, *real_type; |
| int full, top, using_enc; |
| |
| /* 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. */ |
| |
| type = check_typedef (value_type (val)); |
| |
| 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. */ |
| if (TYPE_CODE (type) == TYPE_CODE_PTR |
| && TYPE_NAME (type) == NULL |
| && TYPE_NAME (TYPE_TARGET_TYPE (type)) != NULL |
| && strcmp (TYPE_NAME (TYPE_TARGET_TYPE (type)), "char") == 0) |
| { |
| /* Print nothing */ |
| } |
| else if (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, "("); |
| real_type = value_rtti_target_type (val, &full, &top, &using_enc); |
| if (real_type) |
| { |
| /* RTTI entry found */ |
| if (TYPE_CODE (type) == TYPE_CODE_PTR) |
| { |
| /* create a pointer type pointing to the real type */ |
| type = lookup_pointer_type (real_type); |
| } |
| else |
| { |
| /* create a reference type referencing the real type */ |
| type = lookup_reference_type (real_type); |
| } |
| /* JYG: Need to adjust pointer value. */ |
| /* NOTE: cagney/2005-01-02: THIS IS BOGUS. */ |
| value_contents_writeable (val)[0] -= 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, ") "); |
| } |
| else |
| { |
| /* normal case */ |
| fprintf_filtered (stream, "("); |
| type_print (value_type (val), "", stream, -1); |
| fprintf_filtered (stream, ") "); |
| } |
| } |
| |
| if (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 */ |
| return val_print (value_enclosing_type (val), |
| value_contents_all (val), 0, |
| VALUE_ADDRESS (val), stream, format, 1, 0, pretty); |
| /* 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))); |
| return val_print (value_enclosing_type (val), |
| value_contents_all (val), 0, |
| VALUE_ADDRESS (val), stream, format, 1, 0, pretty); |
| } |
| /* Otherwise, we end up at the return outside this "if" */ |
| } |
| |
| return val_print (type, value_contents_all (val), |
| value_embedded_offset (val), |
| VALUE_ADDRESS (val) + value_offset (val), |
| stream, format, 1, 0, pretty); |
| } |