/* Support for printing Java values for GDB, the GNU debugger. Copyright (C) 1997-2013 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 "symtab.h" #include "gdbtypes.h" #include "gdbcore.h" #include "expression.h" #include "value.h" #include "demangle.h" #include "valprint.h" #include "language.h" #include "jv-lang.h" #include "c-lang.h" #include "annotate.h" #include "gdb_string.h" /* Local functions */ void java_value_print (struct value *val, struct ui_file *stream, const struct value_print_options *options) { struct gdbarch *gdbarch = get_type_arch (value_type (val)); enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); struct type *type; CORE_ADDR address; int i; const char *name; struct value_print_options opts; type = value_type (val); address = value_address (val); if (is_object_type (type)) { CORE_ADDR obj_addr; struct value *tem = val; /* Get the run-time type, and cast the object into that. */ while (TYPE_CODE (value_type (tem)) == TYPE_CODE_PTR) tem = value_ind (tem); obj_addr = value_address (tem); if (obj_addr != 0) { type = type_from_class (gdbarch, java_class_from_object (val)); type = lookup_pointer_type (type); val = value_at (type, address); } } if (TYPE_CODE (type) == TYPE_CODE_PTR && !value_logical_not (val)) type_print (TYPE_TARGET_TYPE (type), "", stream, -1); name = TYPE_TAG_NAME (type); if (TYPE_CODE (type) == TYPE_CODE_STRUCT && name != NULL && (i = strlen (name), name[i - 1] == ']')) { gdb_byte buf4[4]; long length; unsigned int things_printed = 0; int reps; struct type *el_type = java_primitive_type_from_name (gdbarch, name, i - 2); i = 0; read_memory (address + get_java_object_header_size (gdbarch), buf4, 4); length = (long) extract_signed_integer (buf4, 4, byte_order); fprintf_filtered (stream, "{length: %ld", length); if (el_type == NULL) { CORE_ADDR element; CORE_ADDR next_element = -1; /* Dummy initial value. */ /* Skip object header and length. */ address += get_java_object_header_size (gdbarch) + 4; while (i < length && things_printed < options->print_max) { gdb_byte *buf; buf = alloca (gdbarch_ptr_bit (gdbarch) / HOST_CHAR_BIT); fputs_filtered (", ", stream); wrap_here (n_spaces (2)); if (i > 0) element = next_element; else { read_memory (address, buf, sizeof (buf)); address += gdbarch_ptr_bit (gdbarch) / HOST_CHAR_BIT; /* FIXME: cagney/2003-05-24: Bogus or what. It pulls a host sized pointer out of the target and then extracts that as an address (while assuming that the address is unsigned)! */ element = extract_unsigned_integer (buf, sizeof (buf), byte_order); } for (reps = 1; i + reps < length; reps++) { read_memory (address, buf, sizeof (buf)); address += gdbarch_ptr_bit (gdbarch) / HOST_CHAR_BIT; /* FIXME: cagney/2003-05-24: Bogus or what. It pulls a host sized pointer out of the target and then extracts that as an address (while assuming that the address is unsigned)! */ next_element = extract_unsigned_integer (buf, sizeof (buf), byte_order); if (next_element != element) break; } if (reps == 1) fprintf_filtered (stream, "%d: ", i); else fprintf_filtered (stream, "%d..%d: ", i, i + reps - 1); if (element == 0) fprintf_filtered (stream, "null"); else fprintf_filtered (stream, "@%s", paddress (gdbarch, element)); things_printed++; i += reps; } } else { struct value *v = allocate_value (el_type); struct value *next_v = allocate_value (el_type); set_value_address (v, (address + get_java_object_header_size (gdbarch) + 4)); set_value_address (next_v, value_raw_address (v)); while (i < length && things_printed < options->print_max) { fputs_filtered (", ", stream); wrap_here (n_spaces (2)); if (i > 0) { struct value *tmp; tmp = next_v; next_v = v; v = tmp; } else { set_value_lazy (v, 1); set_value_offset (v, 0); } set_value_offset (next_v, value_offset (v)); for (reps = 1; i + reps < length; reps++) { set_value_lazy (next_v, 1); set_value_offset (next_v, value_offset (next_v) + TYPE_LENGTH (el_type)); value_fetch_lazy (next_v); if (!(value_available_contents_eq (v, value_embedded_offset (v), next_v, value_embedded_offset (next_v), TYPE_LENGTH (el_type)))) break; } if (reps == 1) fprintf_filtered (stream, "%d: ", i); else fprintf_filtered (stream, "%d..%d: ", i, i + reps - 1); opts = *options; opts.deref_ref = 1; common_val_print (v, stream, 1, &opts, current_language); things_printed++; i += reps; } } if (i < length) fprintf_filtered (stream, "..."); fprintf_filtered (stream, "}"); return; } /* If it's type String, print it. */ if (TYPE_CODE (type) == TYPE_CODE_PTR && TYPE_TARGET_TYPE (type) && TYPE_TAG_NAME (TYPE_TARGET_TYPE (type)) && strcmp (TYPE_TAG_NAME (TYPE_TARGET_TYPE (type)), "java.lang.String") == 0 && (options->format == 0 || options->format == 's') && address != 0 && value_as_address (val) != 0) { struct type *char_type; struct value *data_val; CORE_ADDR data; struct value *boffset_val; unsigned long boffset; struct value *count_val; unsigned long count; struct value *mark; fputs_filtered (" ", stream); mark = value_mark (); /* Remember start of new values. */ data_val = value_struct_elt (&val, NULL, "data", NULL, NULL); data = value_as_address (data_val); boffset_val = value_struct_elt (&val, NULL, "boffset", NULL, NULL); boffset = value_as_address (boffset_val); count_val = value_struct_elt (&val, NULL, "count", NULL, NULL); count = value_as_address (count_val); value_free_to_mark (mark); /* Release unnecessary values. */ char_type = builtin_java_type (gdbarch)->builtin_char; val_print_string (char_type, NULL, data + boffset, count, stream, options); return; } opts = *options; opts.deref_ref = 1; common_val_print (val, stream, 0, &opts, current_language); } /* TYPE, VALADDR, ADDRESS, STREAM, RECURSE, and OPTIONS have the same meanings as in cp_print_value and c_val_print. DONT_PRINT is an array of baseclass types that we should not print, or zero if called from top level. */ static void java_print_value_fields (struct type *type, const gdb_byte *valaddr, int offset, CORE_ADDR address, struct ui_file *stream, int recurse, const struct value *val, const struct value_print_options *options) { int i, len, n_baseclasses; CHECK_TYPEDEF (type); fprintf_filtered (stream, "{"); len = TYPE_NFIELDS (type); n_baseclasses = TYPE_N_BASECLASSES (type); if (n_baseclasses > 0) { int i, n_baseclasses = TYPE_N_BASECLASSES (type); for (i = 0; i < n_baseclasses; i++) { int boffset; struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i)); const char *basename = TYPE_NAME (baseclass); const gdb_byte *base_valaddr; if (BASETYPE_VIA_VIRTUAL (type, i)) continue; if (basename != NULL && strcmp (basename, "java.lang.Object") == 0) continue; boffset = 0; if (options->pretty) { fprintf_filtered (stream, "\n"); print_spaces_filtered (2 * (recurse + 1), stream); } fputs_filtered ("<", stream); /* Not sure what the best notation is in the case where there is no baseclass name. */ fputs_filtered (basename ? basename : "", stream); fputs_filtered ("> = ", stream); base_valaddr = valaddr; java_print_value_fields (baseclass, base_valaddr, offset + boffset, address, stream, recurse + 1, val, options); fputs_filtered (", ", stream); } } if (!len && n_baseclasses == 1) fprintf_filtered (stream, "<No data fields>"); else { int fields_seen = 0; for (i = n_baseclasses; i < len; i++) { /* If requested, skip printing of static fields. */ if (field_is_static (&TYPE_FIELD (type, i))) { const char *name = TYPE_FIELD_NAME (type, i); if (!options->static_field_print) continue; if (name != NULL && strcmp (name, "class") == 0) continue; } if (fields_seen) fprintf_filtered (stream, ", "); else if (n_baseclasses > 0) { if (options->pretty) { fprintf_filtered (stream, "\n"); print_spaces_filtered (2 + 2 * recurse, stream); fputs_filtered ("members of ", stream); fputs_filtered (type_name_no_tag (type), stream); fputs_filtered (": ", stream); } } fields_seen = 1; if (options->pretty) { fprintf_filtered (stream, "\n"); print_spaces_filtered (2 + 2 * recurse, stream); } else { wrap_here (n_spaces (2 + 2 * recurse)); } annotate_field_begin (TYPE_FIELD_TYPE (type, i)); if (field_is_static (&TYPE_FIELD (type, i))) fputs_filtered ("static ", stream); fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i), language_cplus, DMGL_PARAMS | DMGL_ANSI); annotate_field_name_end (); fputs_filtered (": ", stream); annotate_field_value (); if (!field_is_static (&TYPE_FIELD (type, 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_filtered ("<optimized out or zero length>", stream); } else if (value_bits_synthetic_pointer (val, TYPE_FIELD_BITPOS (type, i), TYPE_FIELD_BITSIZE (type, i))) { fputs_filtered (_("<synthetic pointer>"), stream); } else if (!value_bits_valid (val, TYPE_FIELD_BITPOS (type, i), TYPE_FIELD_BITSIZE (type, i))) { val_print_optimized_out (stream); } else { struct value_print_options opts; v = value_field_bitfield (type, i, valaddr, offset, val); opts = *options; opts.deref_ref = 0; common_val_print (v, stream, recurse + 1, &opts, current_language); } } else { if (TYPE_FIELD_IGNORE (type, i)) { fputs_filtered ("<optimized out or zero length>", stream); } else if (field_is_static (&TYPE_FIELD (type, i))) { struct value *v = value_static_field (type, i); if (v == NULL) val_print_optimized_out (stream); else { struct value_print_options opts; struct type *t = check_typedef (value_type (v)); if (TYPE_CODE (t) == TYPE_CODE_STRUCT) v = value_addr (v); opts = *options; opts.deref_ref = 0; common_val_print (v, stream, recurse + 1, &opts, current_language); } } else if (TYPE_FIELD_TYPE (type, i) == NULL) fputs_filtered ("<unknown type>", stream); else { struct value_print_options opts = *options; opts.deref_ref = 0; val_print (TYPE_FIELD_TYPE (type, i), valaddr, offset + TYPE_FIELD_BITPOS (type, i) / 8, address, stream, recurse + 1, val, &opts, current_language); } } annotate_field_end (); } if (options->pretty) { fprintf_filtered (stream, "\n"); print_spaces_filtered (2 * recurse, stream); } } fprintf_filtered (stream, "}"); } /* See val_print for a description of the various parameters of this function; they are identical. */ void java_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset, CORE_ADDR address, struct ui_file *stream, int recurse, const struct value *val, const struct value_print_options *options) { struct gdbarch *gdbarch = get_type_arch (type); struct type *target_type; CORE_ADDR addr; CHECK_TYPEDEF (type); switch (TYPE_CODE (type)) { case TYPE_CODE_PTR: if (options->format && options->format != 's') { val_print_scalar_formatted (type, valaddr, embedded_offset, val, options, 0, stream); break; } addr = unpack_pointer (type, valaddr + embedded_offset); if (addr == 0) { fputs_filtered ("null", stream); return; } target_type = check_typedef (TYPE_TARGET_TYPE (type)); if (TYPE_CODE (target_type) == TYPE_CODE_FUNC) { /* Try to print what function it points to. */ print_address_demangle (options, gdbarch, addr, stream, demangle); return; } if (options->addressprint && options->format != 's') { fputs_filtered ("@", stream); print_longest (stream, 'x', 0, (ULONGEST) addr); } return; case TYPE_CODE_CHAR: case TYPE_CODE_INT: /* Can't just call c_val_print because that prints bytes as C chars. */ 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, val, &opts, 0, stream); } else if (TYPE_CODE (type) == TYPE_CODE_CHAR || (TYPE_CODE (type) == TYPE_CODE_INT && TYPE_LENGTH (type) == 2 && strcmp (TYPE_NAME (type), "char") == 0)) LA_PRINT_CHAR ((int) unpack_long (type, valaddr + embedded_offset), type, stream); else val_print_type_code_int (type, valaddr + embedded_offset, stream); break; case TYPE_CODE_STRUCT: java_print_value_fields (type, valaddr, embedded_offset, address, stream, recurse, val, options); break; default: c_val_print (type, valaddr, embedded_offset, address, stream, recurse, val, options); break; } }