/* Glue to interface gcj with bytecode verifier.
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/* Glue to interface gcj with bytecode verifier.
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Copyright (C) 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
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Copyright (C) 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
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This file is part of GCC.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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GCC 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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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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any later version.
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GCC is distributed in the hope that it will be useful,
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GCC 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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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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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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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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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>.
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<http://www.gnu.org/licenses/>.
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Java and all Java-based marks are trademarks or registered trademarks
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Java and all Java-based marks are trademarks or registered trademarks
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of Sun Microsystems, Inc. in the United States and other countries.
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of Sun Microsystems, Inc. in the United States and other countries.
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The Free Software Foundation is independent of Sun Microsystems, Inc. */
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The Free Software Foundation is independent of Sun Microsystems, Inc. */
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/* Written by Tom Tromey <tromey@redhat.com>. */
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/* Written by Tom Tromey <tromey@redhat.com>. */
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#include "config.h"
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#include "config.h"
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#include "system.h"
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#include "system.h"
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#include "coretypes.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "tm.h"
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#include "tree.h"
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#include "tree.h"
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#include "parse.h"
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#include "parse.h"
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#include "verify.h"
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#include "verify.h"
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#include "java-tree.h"
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#include "java-tree.h"
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#include "java-except.h"
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#include "java-except.h"
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#include "toplev.h"
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#include "toplev.h"
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void *
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void *
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vfy_alloc (size_t bytes)
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vfy_alloc (size_t bytes)
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{
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{
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return xmalloc (bytes);
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return xmalloc (bytes);
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}
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}
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void
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void
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vfy_free (void *mem)
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vfy_free (void *mem)
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{
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{
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free (mem);
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free (mem);
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}
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}
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bool
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bool
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vfy_strings_equal (vfy_string one, vfy_string two)
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vfy_strings_equal (vfy_string one, vfy_string two)
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{
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{
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return one == two;
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return one == two;
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}
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}
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const char *
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const char *
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vfy_string_bytes (vfy_string str)
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vfy_string_bytes (vfy_string str)
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{
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{
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return IDENTIFIER_POINTER (str);
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return IDENTIFIER_POINTER (str);
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}
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}
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int
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int
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vfy_string_length (vfy_string str)
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vfy_string_length (vfy_string str)
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{
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{
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return IDENTIFIER_LENGTH (str);
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return IDENTIFIER_LENGTH (str);
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}
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}
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vfy_string
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vfy_string
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vfy_init_name (void)
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vfy_init_name (void)
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{
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{
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return init_identifier_node;
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return init_identifier_node;
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}
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}
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vfy_string
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vfy_string
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vfy_clinit_name (void)
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vfy_clinit_name (void)
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{
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{
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return clinit_identifier_node;
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return clinit_identifier_node;
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}
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}
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static const char*
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static const char*
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skip_one_type (const char* ptr)
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skip_one_type (const char* ptr)
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{
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{
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int ch = *ptr++;
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int ch = *ptr++;
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while (ch == '[')
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while (ch == '[')
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{
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{
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ch = *ptr++;
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ch = *ptr++;
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}
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}
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if (ch == 'L')
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if (ch == 'L')
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{
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{
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do { ch = *ptr++; } while (ch != ';');
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do { ch = *ptr++; } while (ch != ';');
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}
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}
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return ptr;
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return ptr;
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}
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}
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int
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int
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vfy_count_arguments (vfy_string signature)
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vfy_count_arguments (vfy_string signature)
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{
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{
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const char *ptr = IDENTIFIER_POINTER (signature);
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const char *ptr = IDENTIFIER_POINTER (signature);
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int arg_count = 0;
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int arg_count = 0;
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/* Skip '('. */
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/* Skip '('. */
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ptr++;
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ptr++;
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/* Count args. */
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/* Count args. */
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while (*ptr != ')')
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while (*ptr != ')')
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{
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{
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ptr = skip_one_type (ptr);
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ptr = skip_one_type (ptr);
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arg_count += 1;
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arg_count += 1;
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}
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}
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return arg_count;
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return arg_count;
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}
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}
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vfy_string
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vfy_string
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vfy_get_string (const char *s, int len)
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vfy_get_string (const char *s, int len)
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{
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{
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return get_identifier_with_length (s, len);
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return get_identifier_with_length (s, len);
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}
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}
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vfy_string
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vfy_string
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vfy_get_signature (vfy_method *method)
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vfy_get_signature (vfy_method *method)
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{
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{
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return method->signature;
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return method->signature;
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}
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}
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vfy_string
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vfy_string
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vfy_get_method_name (vfy_method *method)
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vfy_get_method_name (vfy_method *method)
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{
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{
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return method->name;
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return method->name;
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}
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}
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bool
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bool
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vfy_is_static (vfy_method *method)
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vfy_is_static (vfy_method *method)
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{
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{
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return METHOD_STATIC (method->method);
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return METHOD_STATIC (method->method);
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}
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}
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const unsigned char *
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const unsigned char *
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vfy_get_bytecode (vfy_method *method)
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vfy_get_bytecode (vfy_method *method)
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{
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{
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return method->bytes;
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return method->bytes;
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}
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}
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vfy_exception *
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vfy_exception *
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vfy_get_exceptions (vfy_method *method)
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vfy_get_exceptions (vfy_method *method)
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{
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{
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return method->exceptions;
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return method->exceptions;
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}
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}
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void
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void
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vfy_get_exception (vfy_exception *exceptions, int index, int *handler,
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vfy_get_exception (vfy_exception *exceptions, int index, int *handler,
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int *start, int *end, int *handler_type)
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int *start, int *end, int *handler_type)
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{
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{
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*handler = exceptions[index].handler;
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*handler = exceptions[index].handler;
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*start = exceptions[index].start;
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*start = exceptions[index].start;
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*end = exceptions[index].end;
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*end = exceptions[index].end;
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*handler_type = exceptions[index].type;
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*handler_type = exceptions[index].type;
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}
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}
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int
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int
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vfy_tag (vfy_constants *pool, int index)
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vfy_tag (vfy_constants *pool, int index)
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{
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{
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int result = JPOOL_TAG (pool, index);
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int result = JPOOL_TAG (pool, index);
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/* gcj will resolve constant pool entries other than string and
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/* gcj will resolve constant pool entries other than string and
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class references. The verifier doesn't care about the values, so
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class references. The verifier doesn't care about the values, so
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we just strip off the resolved flag. */
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we just strip off the resolved flag. */
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if ((result & CONSTANT_ResolvedFlag) != 0
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if ((result & CONSTANT_ResolvedFlag) != 0
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&& result != CONSTANT_ResolvedString
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&& result != CONSTANT_ResolvedString
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&& result != CONSTANT_ResolvedClass)
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&& result != CONSTANT_ResolvedClass)
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result &= ~ CONSTANT_ResolvedFlag;
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result &= ~ CONSTANT_ResolvedFlag;
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return result;
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return result;
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}
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}
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void
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void
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vfy_load_indexes (vfy_constants *pool, int index,
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vfy_load_indexes (vfy_constants *pool, int index,
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vfy_uint_16 *index0, vfy_uint_16 *index1)
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vfy_uint_16 *index0, vfy_uint_16 *index1)
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{
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{
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*index0 = JPOOL_USHORT1 (pool, index);
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*index0 = JPOOL_USHORT1 (pool, index);
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*index1 = JPOOL_USHORT2 (pool, index);
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*index1 = JPOOL_USHORT2 (pool, index);
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}
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}
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vfy_constants *
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vfy_constants *
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vfy_get_constants (vfy_jclass klass)
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vfy_get_constants (vfy_jclass klass)
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{
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{
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return TYPE_JCF (klass);
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return TYPE_JCF (klass);
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}
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}
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int
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int
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vfy_get_constants_size (vfy_jclass klass)
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vfy_get_constants_size (vfy_jclass klass)
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{
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{
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return JPOOL_SIZE (TYPE_JCF (klass));
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return JPOOL_SIZE (TYPE_JCF (klass));
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}
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}
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vfy_string
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vfy_string
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vfy_get_pool_string (vfy_constants *pool, int index)
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vfy_get_pool_string (vfy_constants *pool, int index)
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{
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{
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return get_name_constant (pool, index);
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return get_name_constant (pool, index);
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}
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}
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vfy_jclass
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vfy_jclass
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vfy_get_pool_class (vfy_constants *pool, int index)
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vfy_get_pool_class (vfy_constants *pool, int index)
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{
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{
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vfy_jclass k;
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vfy_jclass k;
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k = get_class_constant (pool, index);
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k = get_class_constant (pool, index);
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return k;
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return k;
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}
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}
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vfy_string
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vfy_string
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vfy_get_class_name (vfy_jclass klass)
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vfy_get_class_name (vfy_jclass klass)
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{
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{
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return DECL_NAME (TYPE_NAME (klass));
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return DECL_NAME (TYPE_NAME (klass));
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}
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}
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bool
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bool
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vfy_is_assignable_from (vfy_jclass target, vfy_jclass source)
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vfy_is_assignable_from (vfy_jclass target, vfy_jclass source)
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{
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{
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/* Any class is always assignable to itself, or java.lang.Object. */
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/* Any class is always assignable to itself, or java.lang.Object. */
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if (source == target || target == object_type_node)
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if (source == target || target == object_type_node)
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return true;
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return true;
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/* For the C++ ABI, perform this test statically. */
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/* For the C++ ABI, perform this test statically. */
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if (! flag_indirect_dispatch)
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if (! flag_indirect_dispatch)
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return can_widen_reference_to (source, target);
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return can_widen_reference_to (source, target);
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/* For the BC-ABI, we assume at compile time that reference types are always
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/* For the BC-ABI, we assume at compile time that reference types are always
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compatible. However, a type assertion table entry is emitted so that the
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compatible. However, a type assertion table entry is emitted so that the
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runtime can detect binary-incompatible changes. */
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runtime can detect binary-incompatible changes. */
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add_type_assertion (current_class, JV_ASSERT_TYPES_COMPATIBLE, source,
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add_type_assertion (current_class, JV_ASSERT_TYPES_COMPATIBLE, source,
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target);
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target);
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return true;
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return true;
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}
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}
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char
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char
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vfy_get_primitive_char (vfy_jclass klass)
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vfy_get_primitive_char (vfy_jclass klass)
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{
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{
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tree sig;
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tree sig;
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gcc_assert (vfy_is_primitive (klass));
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gcc_assert (vfy_is_primitive (klass));
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sig = build_java_signature (klass);
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sig = build_java_signature (klass);
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return (IDENTIFIER_POINTER (sig))[0];
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return (IDENTIFIER_POINTER (sig))[0];
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}
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}
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bool
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bool
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vfy_is_array (vfy_jclass klass)
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vfy_is_array (vfy_jclass klass)
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{
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{
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return TYPE_ARRAY_P (klass);
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return TYPE_ARRAY_P (klass);
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}
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}
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bool
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bool
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vfy_is_interface (vfy_jclass klass)
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vfy_is_interface (vfy_jclass klass)
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{
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{
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return CLASS_INTERFACE (TYPE_NAME (klass));
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return CLASS_INTERFACE (TYPE_NAME (klass));
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}
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}
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bool
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bool
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vfy_is_primitive (vfy_jclass klass)
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vfy_is_primitive (vfy_jclass klass)
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{
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{
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return JPRIMITIVE_TYPE_P (klass);
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return JPRIMITIVE_TYPE_P (klass);
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}
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}
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vfy_jclass
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vfy_jclass
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vfy_get_superclass (vfy_jclass klass)
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vfy_get_superclass (vfy_jclass klass)
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{
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{
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vfy_jclass k;
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vfy_jclass k;
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k = CLASSTYPE_SUPER (klass);
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k = CLASSTYPE_SUPER (klass);
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return k;
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return k;
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}
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}
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vfy_jclass
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vfy_jclass
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vfy_get_array_class (vfy_jclass klass)
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vfy_get_array_class (vfy_jclass klass)
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{
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{
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vfy_jclass k;
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vfy_jclass k;
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k = build_java_array_type (klass, -1);
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k = build_java_array_type (klass, -1);
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return k;
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return k;
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}
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}
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vfy_jclass
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vfy_jclass
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vfy_get_component_type (vfy_jclass klass)
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vfy_get_component_type (vfy_jclass klass)
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{
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{
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vfy_jclass k;
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vfy_jclass k;
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gcc_assert (vfy_is_array (klass));
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gcc_assert (vfy_is_array (klass));
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k = TYPE_ARRAY_ELEMENT (klass);
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k = TYPE_ARRAY_ELEMENT (klass);
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if (TREE_CODE (k) == POINTER_TYPE)
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if (TREE_CODE (k) == POINTER_TYPE)
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k = TREE_TYPE (k);
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k = TREE_TYPE (k);
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return k;
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return k;
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}
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}
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bool
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bool
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vfy_is_abstract (vfy_jclass klass)
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vfy_is_abstract (vfy_jclass klass)
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{
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{
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return CLASS_ABSTRACT (TYPE_NAME (klass));
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return CLASS_ABSTRACT (TYPE_NAME (klass));
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}
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}
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vfy_jclass
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vfy_jclass
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vfy_find_class (vfy_jclass ignore ATTRIBUTE_UNUSED, vfy_string name)
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vfy_find_class (vfy_jclass ignore ATTRIBUTE_UNUSED, vfy_string name)
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{
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{
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vfy_jclass k;
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vfy_jclass k;
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|
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k = get_type_from_signature (name);
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k = get_type_from_signature (name);
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if (TREE_CODE (k) == POINTER_TYPE)
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if (TREE_CODE (k) == POINTER_TYPE)
|
k = TREE_TYPE (k);
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k = TREE_TYPE (k);
|
|
|
return k;
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return k;
|
}
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}
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vfy_jclass
|
vfy_jclass
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vfy_object_type (void)
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vfy_object_type (void)
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{
|
{
|
vfy_jclass k;
|
vfy_jclass k;
|
k = object_type_node;
|
k = object_type_node;
|
return k;
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return k;
|
}
|
}
|
|
|
vfy_jclass
|
vfy_jclass
|
vfy_class_type (void)
|
vfy_class_type (void)
|
{
|
{
|
return class_type_node;
|
return class_type_node;
|
}
|
}
|
|
|
vfy_jclass
|
vfy_jclass
|
vfy_string_type (void)
|
vfy_string_type (void)
|
{
|
{
|
vfy_jclass k;
|
vfy_jclass k;
|
k = string_type_node;
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k = string_type_node;
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return k;
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return k;
|
}
|
}
|
|
|
vfy_jclass
|
vfy_jclass
|
vfy_throwable_type (void)
|
vfy_throwable_type (void)
|
{
|
{
|
vfy_jclass k;
|
vfy_jclass k;
|
k = throwable_type_node;
|
k = throwable_type_node;
|
return k;
|
return k;
|
}
|
}
|
|
|
vfy_jclass
|
vfy_jclass
|
vfy_unsuitable_type (void)
|
vfy_unsuitable_type (void)
|
{
|
{
|
return TYPE_SECOND;
|
return TYPE_SECOND;
|
}
|
}
|
|
|
vfy_jclass
|
vfy_jclass
|
vfy_return_address_type (void)
|
vfy_return_address_type (void)
|
{
|
{
|
return TYPE_RETURN_ADDR;
|
return TYPE_RETURN_ADDR;
|
}
|
}
|
|
|
vfy_jclass
|
vfy_jclass
|
vfy_null_type (void)
|
vfy_null_type (void)
|
{
|
{
|
return TYPE_NULL;
|
return TYPE_NULL;
|
}
|
}
|
|
|
bool
|
bool
|
vfy_class_has_field (vfy_jclass klass, vfy_string name,
|
vfy_class_has_field (vfy_jclass klass, vfy_string name,
|
vfy_string signature)
|
vfy_string signature)
|
{
|
{
|
tree field = TYPE_FIELDS (klass);
|
tree field = TYPE_FIELDS (klass);
|
while (field != NULL_TREE)
|
while (field != NULL_TREE)
|
{
|
{
|
if (DECL_NAME (field) == name
|
if (DECL_NAME (field) == name
|
&& build_java_signature (TREE_TYPE (field)) == signature)
|
&& build_java_signature (TREE_TYPE (field)) == signature)
|
return true;
|
return true;
|
field = TREE_CHAIN (field);
|
field = TREE_CHAIN (field);
|
}
|
}
|
return false;
|
return false;
|
}
|
}
|
|
|
int
|
int
|
vfy_fail (const char *message, int pc, vfy_jclass ignore1 ATTRIBUTE_UNUSED,
|
vfy_fail (const char *message, int pc, vfy_jclass ignore1 ATTRIBUTE_UNUSED,
|
vfy_method *ignore2 ATTRIBUTE_UNUSED)
|
vfy_method *ignore2 ATTRIBUTE_UNUSED)
|
{
|
{
|
if (pc == -1)
|
if (pc == -1)
|
error ("verification failed: %s", message);
|
error ("verification failed: %s", message);
|
else
|
else
|
error ("verification failed at PC=%d: %s", pc, message);
|
error ("verification failed at PC=%d: %s", pc, message);
|
/* We have to return a value for the verifier to throw. */
|
/* We have to return a value for the verifier to throw. */
|
return 1;
|
return 1;
|
}
|
}
|
|
|
vfy_jclass
|
vfy_jclass
|
vfy_get_primitive_type (int type)
|
vfy_get_primitive_type (int type)
|
{
|
{
|
vfy_jclass k;
|
vfy_jclass k;
|
k = decode_newarray_type (type);
|
k = decode_newarray_type (type);
|
return k;
|
return k;
|
}
|
}
|
|
|
void
|
void
|
vfy_note_stack_depth (vfy_method *method, int pc, int depth)
|
vfy_note_stack_depth (vfy_method *method, int pc, int depth)
|
{
|
{
|
tree val = make_tree_vec (method->max_locals + depth);
|
tree val = make_tree_vec (method->max_locals + depth);
|
VEC_replace (tree, type_states, pc, val);
|
VEC_replace (tree, type_states, pc, val);
|
/* Called for side effects. */
|
/* Called for side effects. */
|
lookup_label (pc);
|
lookup_label (pc);
|
}
|
}
|
|
|
void
|
void
|
vfy_note_stack_type (vfy_method *method, int pc, int slot, vfy_jclass type)
|
vfy_note_stack_type (vfy_method *method, int pc, int slot, vfy_jclass type)
|
{
|
{
|
tree vec;
|
tree vec;
|
|
|
slot += method->max_locals;
|
slot += method->max_locals;
|
|
|
if (type == object_type_node)
|
if (type == object_type_node)
|
type = object_ptr_type_node;
|
type = object_ptr_type_node;
|
|
|
vec = VEC_index (tree, type_states, pc);
|
vec = VEC_index (tree, type_states, pc);
|
TREE_VEC_ELT (vec, slot) = type;
|
TREE_VEC_ELT (vec, slot) = type;
|
/* Called for side effects. */
|
/* Called for side effects. */
|
lookup_label (pc);
|
lookup_label (pc);
|
}
|
}
|
|
|
void
|
void
|
vfy_note_local_type (vfy_method *method ATTRIBUTE_UNUSED, int pc, int slot,
|
vfy_note_local_type (vfy_method *method ATTRIBUTE_UNUSED, int pc, int slot,
|
vfy_jclass type)
|
vfy_jclass type)
|
{
|
{
|
tree vec;
|
tree vec;
|
|
|
if (type == object_type_node)
|
if (type == object_type_node)
|
type = object_ptr_type_node;
|
type = object_ptr_type_node;
|
|
|
vec = VEC_index (tree, type_states, pc);
|
vec = VEC_index (tree, type_states, pc);
|
TREE_VEC_ELT (vec, slot) = type;
|
TREE_VEC_ELT (vec, slot) = type;
|
/* Called for side effects. */
|
/* Called for side effects. */
|
lookup_label (pc);
|
lookup_label (pc);
|
}
|
}
|
|
|
void
|
void
|
vfy_note_instruction_seen (int pc)
|
vfy_note_instruction_seen (int pc)
|
{
|
{
|
instruction_bits[pc] |= BCODE_VERIFIED;
|
instruction_bits[pc] |= BCODE_VERIFIED;
|
}
|
}
|
|
|
/* Verify the bytecodes of the current method.
|
/* Verify the bytecodes of the current method.
|
Return 1 on success, 0 on failure. */
|
Return 1 on success, 0 on failure. */
|
int
|
int
|
verify_jvm_instructions_new (JCF *jcf, const unsigned char *byte_ops,
|
verify_jvm_instructions_new (JCF *jcf, const unsigned char *byte_ops,
|
long length)
|
long length)
|
{
|
{
|
vfy_method method;
|
vfy_method method;
|
int i, result, eh_count;
|
int i, result, eh_count;
|
vfy_exception *exceptions;
|
vfy_exception *exceptions;
|
|
|
method_init_exceptions ();
|
method_init_exceptions ();
|
|
|
JCF_SEEK (jcf, DECL_CODE_OFFSET (current_function_decl) + length);
|
JCF_SEEK (jcf, DECL_CODE_OFFSET (current_function_decl) + length);
|
eh_count = JCF_readu2 (jcf);
|
eh_count = JCF_readu2 (jcf);
|
|
|
exceptions = (vfy_exception *) xmalloc (eh_count * sizeof (vfy_exception));
|
exceptions = (vfy_exception *) xmalloc (eh_count * sizeof (vfy_exception));
|
for (i = 0; i < eh_count; ++i)
|
for (i = 0; i < eh_count; ++i)
|
{
|
{
|
int start_pc, end_pc, handler_pc, catch_type;
|
int start_pc, end_pc, handler_pc, catch_type;
|
unsigned char *p = jcf->read_ptr + 8 * i;
|
unsigned char *p = jcf->read_ptr + 8 * i;
|
start_pc = GET_u2 (p);
|
start_pc = GET_u2 (p);
|
end_pc = GET_u2 (p+2);
|
end_pc = GET_u2 (p+2);
|
handler_pc = GET_u2 (p+4);
|
handler_pc = GET_u2 (p+4);
|
catch_type = GET_u2 (p+6);
|
catch_type = GET_u2 (p+6);
|
|
|
if (start_pc < 0 || start_pc >= length
|
if (start_pc < 0 || start_pc >= length
|
|| end_pc < 0 || end_pc > length || start_pc >= end_pc
|
|| end_pc < 0 || end_pc > length || start_pc >= end_pc
|
|| handler_pc < 0 || handler_pc >= length)
|
|| handler_pc < 0 || handler_pc >= length)
|
{
|
{
|
error ("bad pc in exception_table");
|
error ("bad pc in exception_table");
|
free (exceptions);
|
free (exceptions);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
exceptions[i].handler = handler_pc;
|
exceptions[i].handler = handler_pc;
|
exceptions[i].start = start_pc;
|
exceptions[i].start = start_pc;
|
exceptions[i].end = end_pc;
|
exceptions[i].end = end_pc;
|
exceptions[i].type = catch_type;
|
exceptions[i].type = catch_type;
|
|
|
add_handler (start_pc, end_pc,
|
add_handler (start_pc, end_pc,
|
lookup_label (handler_pc),
|
lookup_label (handler_pc),
|
catch_type == 0 ? NULL_TREE
|
catch_type == 0 ? NULL_TREE
|
: get_class_constant (jcf, catch_type));
|
: get_class_constant (jcf, catch_type));
|
instruction_bits[handler_pc] |= BCODE_EXCEPTION_TARGET;
|
instruction_bits[handler_pc] |= BCODE_EXCEPTION_TARGET;
|
}
|
}
|
|
|
gcc_assert (sanity_check_exception_range (&whole_range));
|
gcc_assert (sanity_check_exception_range (&whole_range));
|
|
|
method.method = current_function_decl;
|
method.method = current_function_decl;
|
method.signature = build_java_signature (TREE_TYPE (current_function_decl));
|
method.signature = build_java_signature (TREE_TYPE (current_function_decl));
|
method.name = DECL_NAME (current_function_decl);
|
method.name = DECL_NAME (current_function_decl);
|
method.bytes = byte_ops;
|
method.bytes = byte_ops;
|
method.exceptions = exceptions;
|
method.exceptions = exceptions;
|
method.defining_class = DECL_CONTEXT (current_function_decl);
|
method.defining_class = DECL_CONTEXT (current_function_decl);
|
method.max_stack = DECL_MAX_STACK (current_function_decl);
|
method.max_stack = DECL_MAX_STACK (current_function_decl);
|
method.max_locals = DECL_MAX_LOCALS (current_function_decl);
|
method.max_locals = DECL_MAX_LOCALS (current_function_decl);
|
method.code_length = length;
|
method.code_length = length;
|
method.exc_count = eh_count;
|
method.exc_count = eh_count;
|
|
|
result = verify_method (&method);
|
result = verify_method (&method);
|
|
|
free (exceptions);
|
free (exceptions);
|
|
|
return result;
|
return result;
|
}
|
}
|
|
|
