6b8505468e
GDB computes structure byte offsets using a 32 bit integer. And, first it computes the offset in bits and then converts to bytes. The result is that any offset that if 512K bytes or larger overflows. This patch changes GDB to use LONGEST for such calculations. PR gdb/17520 Structure offset wrong when 1/4 GB or greater. * c-lang.h: Change all parameters, variables, and struct or union members used as struct or union fie3ld offsets from int to LONGEST. * c-valprint.c: Likewise. * cp-abi.c: Likewise. * cp-abi.h: Likewise. * cp-valprint.c: Likewise. * d-valprint.c: Likewise. * dwarf2loc.c: Likewise. * eval.c: Likewise. * extension-priv.h: Likewise. * extension.c: Likewise. * extension.h: Likewise. * findvar.c: Likewise. * gdbtypes.h: Likewise. * gnu-v2-abi.c: Likewise. * gnu-v3-abi.c: Likewise. * go-valprint.c: Likewise. * guile/guile-internal.h: Likewise. * guile/scm-pretty-print.c: Likewise. * jv-valprint.c Likewise. * opencl-lang.c: Likewise. * p-lang.h: Likewise. * python/py-prettyprint.c: Likewise. * python/python-internal.h: Likewise. * spu-tdep.c: Likewise. * typeprint.c: Likewise. * valarith.c: Likewise. * valops.c: Likewise. * valprint.c: Likewise. * valprint.h: Likewise. * value.c: Likewise. * value.h: Likewise. * p-valprint.c: Likewise. * c-typeprint.c (c_type_print_base): When printing offset, use plongest, not %d. * gdbtypes.c (recursive_dump_type): Ditto.
699 lines
20 KiB
C
699 lines
20 KiB
C
/* Support for printing C values for GDB, the GNU debugger.
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Copyright (C) 1986-2016 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "symtab.h"
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#include "gdbtypes.h"
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#include "expression.h"
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#include "value.h"
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#include "valprint.h"
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#include "language.h"
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#include "c-lang.h"
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#include "cp-abi.h"
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#include "target.h"
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#include "objfiles.h"
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/* A helper for c_textual_element_type. This checks the name of the
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typedef. This is bogus but it isn't apparent that the compiler
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provides us the help we may need. */
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static int
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textual_name (const char *name)
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{
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return (!strcmp (name, "wchar_t")
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|| !strcmp (name, "char16_t")
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|| !strcmp (name, "char32_t"));
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}
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/* Apply a heuristic to decide whether an array of TYPE or a pointer
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to TYPE should be printed as a textual string. Return non-zero if
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it should, or zero if it should be treated as an array of integers
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or pointer to integers. FORMAT is the current format letter, or 0
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if none.
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We guess that "char" is a character. Explicitly signed and
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unsigned character types are also characters. Integer data from
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vector types is not. The user can override this by using the /s
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format letter. */
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int
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c_textual_element_type (struct type *type, char format)
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{
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struct type *true_type, *iter_type;
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if (format != 0 && format != 's')
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return 0;
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/* We also rely on this for its side effect of setting up all the
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typedef pointers. */
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true_type = check_typedef (type);
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/* TYPE_CODE_CHAR is always textual. */
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if (TYPE_CODE (true_type) == TYPE_CODE_CHAR)
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return 1;
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/* Any other character-like types must be integral. */
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if (TYPE_CODE (true_type) != TYPE_CODE_INT)
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return 0;
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/* We peel typedefs one by one, looking for a match. */
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iter_type = type;
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while (iter_type)
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{
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/* Check the name of the type. */
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if (TYPE_NAME (iter_type) && textual_name (TYPE_NAME (iter_type)))
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return 1;
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if (TYPE_CODE (iter_type) != TYPE_CODE_TYPEDEF)
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break;
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/* Peel a single typedef. If the typedef doesn't have a target
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type, we use check_typedef and hope the result is ok -- it
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might be for C++, where wchar_t is a built-in type. */
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if (TYPE_TARGET_TYPE (iter_type))
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iter_type = TYPE_TARGET_TYPE (iter_type);
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else
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iter_type = check_typedef (iter_type);
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}
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if (format == 's')
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{
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/* Print this as a string if we can manage it. For now, no wide
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character support. */
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if (TYPE_CODE (true_type) == TYPE_CODE_INT
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&& TYPE_LENGTH (true_type) == 1)
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return 1;
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}
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else
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{
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/* If a one-byte TYPE_CODE_INT is missing the not-a-character
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flag, then we treat it as text; otherwise, we assume it's
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being used as data. */
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if (TYPE_CODE (true_type) == TYPE_CODE_INT
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&& TYPE_LENGTH (true_type) == 1
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&& !TYPE_NOTTEXT (true_type))
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return 1;
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}
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return 0;
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}
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/* Decorations for C. */
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static const struct generic_val_print_decorations c_decorations =
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{
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"",
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" + ",
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" * I",
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"true",
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"false",
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"void",
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"{",
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"}"
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};
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/* Print a pointer based on the type of its target.
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Arguments to this functions are roughly the same as those in c_val_print.
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A difference is that ADDRESS is the address to print, with embedded_offset
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already added. UNRESOLVED_ELTTYPE and ELTTYPE represent the pointed type,
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respectively before and after check_typedef. */
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static void
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print_unpacked_pointer (struct type *type, struct type *elttype,
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struct type *unresolved_elttype,
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const gdb_byte *valaddr, int embedded_offset,
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CORE_ADDR address, struct ui_file *stream, int recurse,
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const struct value_print_options *options)
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{
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int want_space = 0;
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struct gdbarch *gdbarch = get_type_arch (type);
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if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
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{
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/* Try to print what function it points to. */
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print_function_pointer_address (options, gdbarch, address, stream);
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return;
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}
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if (options->symbol_print)
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want_space = print_address_demangle (options, gdbarch, address, stream,
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demangle);
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else if (options->addressprint)
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{
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fputs_filtered (paddress (gdbarch, address), stream);
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want_space = 1;
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}
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/* For a pointer to a textual type, also print the string
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pointed to, unless pointer is null. */
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if (c_textual_element_type (unresolved_elttype, options->format)
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&& address != 0)
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{
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if (want_space)
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fputs_filtered (" ", stream);
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val_print_string (unresolved_elttype, NULL, address, -1, stream, options);
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}
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else if (cp_is_vtbl_member (type))
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{
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/* Print vtbl's nicely. */
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CORE_ADDR vt_address = unpack_pointer (type, valaddr + embedded_offset);
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struct bound_minimal_symbol msymbol =
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lookup_minimal_symbol_by_pc (vt_address);
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/* If 'symbol_print' is set, we did the work above. */
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if (!options->symbol_print
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&& (msymbol.minsym != NULL)
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&& (vt_address == BMSYMBOL_VALUE_ADDRESS (msymbol)))
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{
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if (want_space)
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fputs_filtered (" ", stream);
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fputs_filtered (" <", stream);
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fputs_filtered (MSYMBOL_PRINT_NAME (msymbol.minsym), stream);
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fputs_filtered (">", stream);
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want_space = 1;
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}
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if (vt_address && options->vtblprint)
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{
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struct value *vt_val;
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struct symbol *wsym = NULL;
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struct type *wtype;
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struct block *block = NULL;
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struct field_of_this_result is_this_fld;
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if (want_space)
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fputs_filtered (" ", stream);
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if (msymbol.minsym != NULL)
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wsym = lookup_symbol (MSYMBOL_LINKAGE_NAME(msymbol.minsym), block,
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VAR_DOMAIN, &is_this_fld).symbol;
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if (wsym)
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{
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wtype = SYMBOL_TYPE (wsym);
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}
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else
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{
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wtype = unresolved_elttype;
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}
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vt_val = value_at (wtype, vt_address);
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common_val_print (vt_val, stream, recurse + 1, options,
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current_language);
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if (options->prettyformat)
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{
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fprintf_filtered (stream, "\n");
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print_spaces_filtered (2 + 2 * recurse, stream);
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}
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}
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}
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}
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/* c_val_print helper for TYPE_CODE_ARRAY. */
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static void
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c_val_print_array (struct type *type, const gdb_byte *valaddr,
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int embedded_offset, CORE_ADDR address,
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struct ui_file *stream, int recurse,
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const struct value *original_value,
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const struct value_print_options *options)
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{
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struct type *unresolved_elttype = TYPE_TARGET_TYPE (type);
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struct type *elttype = check_typedef (unresolved_elttype);
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struct gdbarch *arch = get_type_arch (type);
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int unit_size = gdbarch_addressable_memory_unit_size (arch);
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if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (unresolved_elttype) > 0)
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{
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LONGEST low_bound, high_bound;
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int eltlen, len;
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struct gdbarch *gdbarch = get_type_arch (type);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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unsigned int i = 0; /* Number of characters printed. */
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if (!get_array_bounds (type, &low_bound, &high_bound))
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error (_("Could not determine the array high bound"));
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eltlen = TYPE_LENGTH (elttype);
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len = high_bound - low_bound + 1;
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if (options->prettyformat_arrays)
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{
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print_spaces_filtered (2 + 2 * recurse, stream);
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}
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/* Print arrays of textual chars with a string syntax, as
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long as the entire array is valid. */
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if (c_textual_element_type (unresolved_elttype,
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options->format)
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&& value_bytes_available (original_value, embedded_offset,
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TYPE_LENGTH (type))
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&& !value_bits_any_optimized_out (original_value,
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TARGET_CHAR_BIT * embedded_offset,
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TARGET_CHAR_BIT * TYPE_LENGTH (type)))
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{
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int force_ellipses = 0;
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/* If requested, look for the first null char and only
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print elements up to it. */
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if (options->stop_print_at_null)
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{
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unsigned int temp_len;
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for (temp_len = 0;
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(temp_len < len
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&& temp_len < options->print_max
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&& extract_unsigned_integer (valaddr
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+ embedded_offset * unit_size
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+ temp_len * eltlen,
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eltlen, byte_order) != 0);
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++temp_len)
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;
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/* Force LA_PRINT_STRING to print ellipses if
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we've printed the maximum characters and
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the next character is not \000. */
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if (temp_len == options->print_max && temp_len < len)
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{
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ULONGEST val
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= extract_unsigned_integer (valaddr
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+ embedded_offset * unit_size
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+ temp_len * eltlen,
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eltlen, byte_order);
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if (val != 0)
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force_ellipses = 1;
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}
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len = temp_len;
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}
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LA_PRINT_STRING (stream, unresolved_elttype,
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valaddr + embedded_offset * unit_size, len,
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NULL, force_ellipses, options);
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i = len;
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}
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else
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{
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fprintf_filtered (stream, "{");
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/* If this is a virtual function table, print the 0th
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entry specially, and the rest of the members
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normally. */
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if (cp_is_vtbl_ptr_type (elttype))
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{
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i = 1;
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fprintf_filtered (stream, _("%d vtable entries"),
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len - 1);
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}
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else
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{
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i = 0;
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}
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val_print_array_elements (type, valaddr, embedded_offset,
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address, stream,
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recurse, original_value, options, i);
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fprintf_filtered (stream, "}");
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}
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}
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else
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{
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/* Array of unspecified length: treat like pointer to first elt. */
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print_unpacked_pointer (type, elttype, unresolved_elttype, valaddr,
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embedded_offset, address + embedded_offset,
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stream, recurse, options);
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}
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}
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/* c_val_print helper for TYPE_CODE_PTR. */
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static void
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c_val_print_ptr (struct type *type, const gdb_byte *valaddr,
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int embedded_offset, struct ui_file *stream, int recurse,
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const struct value *original_value,
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const struct value_print_options *options)
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{
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struct gdbarch *arch = get_type_arch (type);
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int unit_size = gdbarch_addressable_memory_unit_size (arch);
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if (options->format && options->format != 's')
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{
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val_print_scalar_formatted (type, valaddr, embedded_offset,
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original_value, options, 0, stream);
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}
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else if (options->vtblprint && cp_is_vtbl_ptr_type (type))
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{
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/* Print the unmangled name if desired. */
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/* Print vtable entry - we only get here if we ARE using
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-fvtable_thunks. (Otherwise, look under
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TYPE_CODE_STRUCT.) */
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CORE_ADDR addr
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= extract_typed_address (valaddr + embedded_offset, type);
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struct gdbarch *gdbarch = get_type_arch (type);
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print_function_pointer_address (options, gdbarch, addr, stream);
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}
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else
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{
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struct type *unresolved_elttype = TYPE_TARGET_TYPE (type);
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struct type *elttype = check_typedef (unresolved_elttype);
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CORE_ADDR addr = unpack_pointer (type,
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valaddr + embedded_offset * unit_size);
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print_unpacked_pointer (type, elttype, unresolved_elttype, valaddr,
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embedded_offset, addr, stream, recurse, options);
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}
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}
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/* c_val_print helper for TYPE_CODE_STRUCT. */
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static void
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c_val_print_struct (struct type *type, const gdb_byte *valaddr,
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int embedded_offset, CORE_ADDR address,
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struct ui_file *stream, int recurse,
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const struct value *original_value,
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const struct value_print_options *options)
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{
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if (options->vtblprint && cp_is_vtbl_ptr_type (type))
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{
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/* Print the unmangled name if desired. */
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/* Print vtable entry - we only get here if NOT using
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-fvtable_thunks. (Otherwise, look under
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TYPE_CODE_PTR.) */
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struct gdbarch *gdbarch = get_type_arch (type);
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int offset = (embedded_offset
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+ TYPE_FIELD_BITPOS (type,
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VTBL_FNADDR_OFFSET) / 8);
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struct type *field_type = TYPE_FIELD_TYPE (type, VTBL_FNADDR_OFFSET);
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CORE_ADDR addr = extract_typed_address (valaddr + offset, field_type);
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print_function_pointer_address (options, gdbarch, addr, stream);
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}
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else
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cp_print_value_fields_rtti (type, valaddr,
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embedded_offset, address,
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stream, recurse,
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original_value, options,
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NULL, 0);
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}
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/* c_val_print helper for TYPE_CODE_UNION. */
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static void
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c_val_print_union (struct type *type, const gdb_byte *valaddr,
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int embedded_offset, CORE_ADDR address,
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struct ui_file *stream, int recurse,
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const struct value *original_value,
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const struct value_print_options *options)
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{
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if (recurse && !options->unionprint)
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{
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fprintf_filtered (stream, "{...}");
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}
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else
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{
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c_val_print_struct (type, valaddr, embedded_offset, address, stream,
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recurse, original_value, options);
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}
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}
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/* c_val_print helper for TYPE_CODE_INT. */
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static void
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c_val_print_int (struct type *type, struct type *unresolved_type,
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const gdb_byte *valaddr, int embedded_offset,
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struct ui_file *stream, const struct value *original_value,
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const struct value_print_options *options)
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{
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struct gdbarch *arch = get_type_arch (type);
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int unit_size = gdbarch_addressable_memory_unit_size (arch);
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if (options->format || options->output_format)
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{
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struct value_print_options opts = *options;
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opts.format = (options->format ? options->format
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: options->output_format);
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val_print_scalar_formatted (type, valaddr, embedded_offset,
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original_value, &opts, 0, stream);
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}
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else
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{
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val_print_type_code_int (type, valaddr + embedded_offset * unit_size,
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stream);
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/* C and C++ has no single byte int type, char is used
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instead. Since we don't know whether the value is really
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intended to be used as an integer or a character, print
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the character equivalent as well. */
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if (c_textual_element_type (unresolved_type, options->format))
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{
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fputs_filtered (" ", stream);
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LA_PRINT_CHAR (unpack_long (type,
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valaddr + embedded_offset * unit_size),
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unresolved_type, stream);
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}
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}
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}
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/* c_val_print helper for TYPE_CODE_MEMBERPTR. */
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static void
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c_val_print_memberptr (struct type *type, const gdb_byte *valaddr,
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int embedded_offset, CORE_ADDR address,
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struct ui_file *stream, int recurse,
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const struct value *original_value,
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const struct value_print_options *options)
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{
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if (!options->format)
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{
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cp_print_class_member (valaddr + embedded_offset, type, stream, "&");
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}
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else
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{
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generic_val_print (type, valaddr, embedded_offset, address, stream,
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recurse, original_value, options, &c_decorations);
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}
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}
|
||
|
||
/* 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 type *unresolved_type = type;
|
||
|
||
type = check_typedef (type);
|
||
switch (TYPE_CODE (type))
|
||
{
|
||
case TYPE_CODE_ARRAY:
|
||
c_val_print_array (type, valaddr, embedded_offset, address, stream,
|
||
recurse, original_value, options);
|
||
break;
|
||
|
||
case TYPE_CODE_METHODPTR:
|
||
cplus_print_method_ptr (valaddr + embedded_offset, type, stream);
|
||
break;
|
||
|
||
case TYPE_CODE_PTR:
|
||
c_val_print_ptr (type, valaddr, embedded_offset, stream, recurse,
|
||
original_value, options);
|
||
break;
|
||
|
||
case TYPE_CODE_UNION:
|
||
c_val_print_union (type, valaddr, embedded_offset, address, stream,
|
||
recurse, original_value, options);
|
||
break;
|
||
|
||
case TYPE_CODE_STRUCT:
|
||
c_val_print_struct (type, valaddr, embedded_offset, address, stream,
|
||
recurse, original_value, options);
|
||
break;
|
||
|
||
case TYPE_CODE_INT:
|
||
c_val_print_int (type, unresolved_type, valaddr, embedded_offset, stream,
|
||
original_value, options);
|
||
break;
|
||
|
||
case TYPE_CODE_MEMBERPTR:
|
||
c_val_print_memberptr (type, valaddr, embedded_offset, address, stream,
|
||
recurse, original_value, options);
|
||
break;
|
||
|
||
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, using_enc;
|
||
LONGEST top;
|
||
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_STRUCT))
|
||
{
|
||
int is_ref = TYPE_CODE (type) == TYPE_CODE_REF;
|
||
|
||
if (is_ref)
|
||
val = value_addr (val);
|
||
|
||
/* 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 (real_type,
|
||
value_as_address (val) - top);
|
||
|
||
/* Note: When we look up RTTI entries, we don't get
|
||
any information on const or volatile
|
||
attributes. */
|
||
}
|
||
}
|
||
|
||
if (is_ref)
|
||
{
|
||
val = value_ref (value_ind (val));
|
||
type = value_type (val);
|
||
}
|
||
|
||
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_STRUCT))
|
||
{
|
||
/* 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);
|
||
}
|