8268720: Unspecified checks on NameAndType constants should not be performed
Reviewed-by: dholmes, lfoltan
This commit is contained in:
Harold Seigel
parent
2c29d790ca
commit
f2e690e0ee
@ -692,22 +692,25 @@ void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
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}
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} else {
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if (_need_verify) {
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// Method name and signature are verified above, when iterating NameAndType_info.
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// Need only to be sure signature is non-zero length and the right type.
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// Method name and signature are individually verified above, when iterating
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// NameAndType_info. Need to check here that signature is non-zero length and
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// the right type.
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if (!Signature::is_method(signature)) {
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throwIllegalSignature("Method", name, signature, CHECK);
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}
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}
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// 4509014: If a class method name begins with '<', it must be "<init>"
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// If a class method name begins with '<', it must be "<init>" and have void signature.
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const unsigned int name_len = name->utf8_length();
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if (tag == JVM_CONSTANT_Methodref &&
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name_len != 0 &&
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name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
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name != vmSymbols::object_initializer_name()) {
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classfile_parse_error(
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"Bad method name at constant pool index %u in class file %s",
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name_ref_index, THREAD);
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return;
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if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
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name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
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if (name != vmSymbols::object_initializer_name()) {
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classfile_parse_error(
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"Bad method name at constant pool index %u in class file %s",
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name_ref_index, THREAD);
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return;
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} else if (!Signature::is_void_method(signature)) { // must have void signature.
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throwIllegalSignature("Method", name, signature, CHECK);
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}
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}
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}
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break;
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@ -2294,6 +2297,7 @@ Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
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int args_size = -1; // only used when _need_verify is true
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if (_need_verify) {
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verify_legal_name_with_signature(name, signature, CHECK_NULL);
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args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
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verify_legal_method_signature(name, signature, CHECK_NULL);
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if (args_size > MAX_ARGS_SIZE) {
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@ -5043,6 +5047,32 @@ void ClassFileParser::verify_legal_field_signature(const Symbol* name,
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}
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}
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// Check that the signature is compatible with the method name. For example,
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// check that <init> has a void signature.
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void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
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const Symbol* signature,
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TRAPS) const {
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if (!_need_verify) {
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return;
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}
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// Class initializers cannot have args for class format version >= 51.
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if (name == vmSymbols::class_initializer_name() &&
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signature != vmSymbols::void_method_signature() &&
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_major_version >= JAVA_7_VERSION) {
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throwIllegalSignature("Method", name, signature, THREAD);
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return;
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}
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int sig_length = signature->utf8_length();
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if (name->utf8_length() > 0 &&
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name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
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sig_length > 0 &&
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signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
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throwIllegalSignature("Method", name, signature, THREAD);
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}
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}
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// Checks if signature is a legal method signature.
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// Returns number of parameters
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int ClassFileParser::verify_legal_method_signature(const Symbol* name,
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@ -5054,14 +5084,6 @@ int ClassFileParser::verify_legal_method_signature(const Symbol* name,
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return -2;
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}
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// Class initializers cannot have args for class format version >= 51.
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if (name == vmSymbols::class_initializer_name() &&
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signature != vmSymbols::void_method_signature() &&
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_major_version >= JAVA_7_VERSION) {
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throwIllegalSignature("Method", name, signature, CHECK_0);
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return 0;
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}
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unsigned int args_size = 0;
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const char* p = (const char*)signature->bytes();
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unsigned int length = signature->utf8_length();
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@ -5084,22 +5106,15 @@ int ClassFileParser::verify_legal_method_signature(const Symbol* name,
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// The first non-signature thing better be a ')'
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if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
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length--;
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if (name->utf8_length() > 0 && name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
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// All internal methods must return void
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if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
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return args_size;
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}
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} else {
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// Now we better just have a return value
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nextp = skip_over_field_signature(p, true, length, CHECK_0);
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if (nextp && ((int)length == (nextp - p))) {
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return args_size;
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}
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// Now we better just have a return value
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nextp = skip_over_field_signature(p, true, length, CHECK_0);
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if (nextp && ((int)length == (nextp - p))) {
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return args_size;
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}
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}
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}
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// Report error
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throwIllegalSignature("Method", name, signature, CHECK_0);
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throwIllegalSignature("Method", name, signature, THREAD);
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return 0;
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}
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@ -462,6 +462,9 @@ class ClassFileParser {
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int verify_legal_method_signature(const Symbol* methodname,
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const Symbol* signature,
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TRAPS) const;
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void verify_legal_name_with_signature(const Symbol* name,
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const Symbol* signature,
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TRAPS) const;
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void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS);
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@ -0,0 +1,68 @@
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/*
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* Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8268720
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* @summary Constant pool NameAndType entries with valid but incompatible method
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* name and signature shouldn't cause an exception until referenced by
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* a method_ref.
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* @compile nonVoidInitSig.jcod
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* @run main/othervm -Xverify:remote NameAndTypeSig
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*/
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// Test constant pool NameAndType descriptors with valid but incompatible method
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// names and signatures.
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public class NameAndTypeSig {
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public static void main(String args[]) throws Throwable {
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// Test that an unreferenced NameAndType with a valid name and signature
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// is allowed even for name and signature pairs such as <init>()D.
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Class newClass = Class.forName("nonVoidInitSig");
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// Test that a NameAndType with a valid name and signature is allowed for
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// name and signature pairs such as <init>()D, but not allowed by a cp
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// Method_ref.
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try {
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Class newClass2 = Class.forName("nonVoidInitSigCFE");
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throw new RuntimeException("Expected ClassFormatError exception not thrown");
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} catch (java.lang.ClassFormatError e) {
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if (!e.getMessage().contains("Method \"<init>\" in class nonVoidInitSigCFE has illegal signature")) {
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throw new RuntimeException("Wrong ClassFormatError exception: " + e.getMessage());
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}
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}
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// Test that a NameAndType with a valid name and invalid signature throws a
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// ClassFormatError exception with a message containing the name <init> and
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// the bad signature.
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try {
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Class newClass2 = Class.forName("voidInitBadSig");
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throw new RuntimeException("Expected ClassFormatError exception not thrown");
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} catch (java.lang.ClassFormatError e) {
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if (!e.getMessage().contains("Method \"<init>\" in class voidInitBadSig has illegal signature \"()))V\"")) {
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throw new RuntimeException("Wrong ClassFormatError exception: " + e.getMessage());
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}
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}
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System.out.println("Test NameAndTypeSig passed.");
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}
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}
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@ -0,0 +1,346 @@
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/*
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* Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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// The constant pool in this class contains an unused NameAndType entry (#20)
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// that points to method <init> and signature ()D. This is a valid NameAndType
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// because <init> is a valid method name and ()D is a valid method signature.
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class nonVoidInitSig {
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0xCAFEBABE;
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0; // minor version
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62; // version
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[21] { // Constant Pool
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; // first element is empty
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Method #2 #3; // #1 at 0x0A
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class #4; // #2 at 0x0F
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NameAndType #5 #6; // #3 at 0x12
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Utf8 "java/lang/Object"; // #4 at 0x17
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Utf8 "<init>"; // #5 at 0x2A
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Utf8 "()V"; // #6 at 0x33
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class #8; // #7 at 0x39
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Utf8 "nonVoidInitSig"; // #8 at 0x3C
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Method #7 #3; // #9 at 0x47
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Utf8 "Code"; // #10 at 0x4C
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Utf8 "LineNumberTable"; // #11 at 0x53
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Utf8 "func"; // #12 at 0x65
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Utf8 "([Ljava/lang/String;)V"; // #13 at 0x6C
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Utf8 "Exceptions"; // #14 at 0x85
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class #16; // #15 at 0x92
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Utf8 "java/lang/Throwable"; // #16 at 0x95
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Utf8 "SourceFile"; // #17 at 0xAB
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Utf8 "nonVoidInitSig.java"; // #18 at 0xB8
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Utf8 "()D"; // #19
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NameAndType #5 #19; // #20 // Unused, points to <init>()D.
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} // Constant Pool
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0x0021; // access [ ACC_PUBLIC ACC_SUPER ]
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#7;// this_cpx
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#2;// super_cpx
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[0] { // Interfaces
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} // Interfaces
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[0] { // Fields
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} // Fields
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[2] { // Methods
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{ // method at 0xD4
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0x0001; // access
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#5; // name_index : <init>
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#6; // descriptor_index : ()V
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[1] { // Attributes
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Attr(#10, 29) { // Code at 0xDC
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1; // max_stack
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1; // max_locals
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Bytes[5]{
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0x2AB70001B1;
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}
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[0] { // Traps
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} // end Traps
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[1] { // Attributes
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Attr(#11, 6) { // LineNumberTable at 0xF3
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[1] { // line_number_table
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0 1; // at 0xFF
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}
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} // end LineNumberTable
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} // Attributes
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} // end Code
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} // Attributes
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}
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;
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{ // method at 0xFF
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0x0009; // access
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#12; // name_index : func
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#13; // descriptor_index : ([Ljava/lang/String;)V
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[2] { // Attributes
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Attr(#10, 37) { // Code at 0x0107
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2; // max_stack
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2; // max_locals
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Bytes[9]{
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0xBB000759B700094C;
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0xB1;
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}
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[0] { // Traps
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} // end Traps
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[1] { // Attributes
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Attr(#11, 10) { // LineNumberTable at 0x0122
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[2] { // line_number_table
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0 4; // at 0x012E
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8 5; // at 0x0132
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}
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} // end LineNumberTable
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} // Attributes
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} // end Code
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;
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Attr(#14, 4) { // Exceptions at 0x0132
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[1] { // Exceptions
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#15; // at 0x013C
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}
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} // end Exceptions
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} // Attributes
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}
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} // Methods
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[1] { // Attributes
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Attr(#17, 2) { // SourceFile at 0x013E
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#18;
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} // end SourceFile
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} // Attributes
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} // end class nonVoidInitSig
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// The constant pool in this class contains a cp NameAndType entry (#3) that
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// points to method <init> and signature ()D. This is a valid NameAndType
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// because <init> is a valid method name and ()D is a valid method signature.
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// But, a cp Methodref (#1) that points to NameAndType with a method named
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// <init> and a non-void return type, is invalid.
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class nonVoidInitSigCFE {
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0xCAFEBABE;
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0; // minor version
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62; // version
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[20] { // Constant Pool
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; // first element is empty
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Method #2 #3; // #1 at 0x0A
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class #4; // #2 at 0x0F
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NameAndType #5 #19; // #3 at 0x12
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Utf8 "java/lang/Object"; // #4 at 0x17
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Utf8 "<init>"; // #5 at 0x2A
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Utf8 "()V"; // #6 at 0x33
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class #8; // #7 at 0x39
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Utf8 "nonVoidInitSigCFE"; // #8 at 0x3C
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Method #7 #3; // #9 at 0x47
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Utf8 "Code"; // #10 at 0x4C
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Utf8 "LineNumberTable"; // #11 at 0x53
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Utf8 "func"; // #12 at 0x65
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Utf8 "([Ljava/lang/String;)V"; // #13 at 0x6C
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Utf8 "Exceptions"; // #14 at 0x85
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class #16; // #15 at 0x92
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Utf8 "java/lang/Throwable"; // #16 at 0x95
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Utf8 "SourceFile"; // #17 at 0xAB
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Utf8 "nonVoidInitSigCFE.java"; // #18 at 0xB8
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Utf8 "()D"; // #19
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} // Constant Pool
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0x0021; // access [ ACC_PUBLIC ACC_SUPER ]
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#7;// this_cpx
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#2;// super_cpx
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[0] { // Interfaces
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} // Interfaces
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[0] { // Fields
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} // Fields
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[2] { // Methods
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{ // method at 0xD4
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0x0001; // access
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#5; // name_index : <init>
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#6; // descriptor_index : ()V
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[1] { // Attributes
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Attr(#10, 29) { // Code at 0xDC
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1; // max_stack
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1; // max_locals
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Bytes[5]{
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0x2AB70001B1;
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}
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[0] { // Traps
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} // end Traps
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[1] { // Attributes
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Attr(#11, 6) { // LineNumberTable at 0xF3
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[1] { // line_number_table
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0 1; // at 0xFF
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}
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} // end LineNumberTable
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} // Attributes
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} // end Code
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} // Attributes
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}
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;
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{ // method at 0xFF
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0x0009; // access
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#12; // name_index : func
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#13; // descriptor_index : ([Ljava/lang/String;)V
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[2] { // Attributes
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Attr(#10, 37) { // Code at 0x0107
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2; // max_stack
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2; // max_locals
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Bytes[9]{
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0xBB000759B700094C;
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0xB1;
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}
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[0] { // Traps
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} // end Traps
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[1] { // Attributes
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Attr(#11, 10) { // LineNumberTable at 0x0122
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[2] { // line_number_table
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0 4; // at 0x012E
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8 5; // at 0x0132
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}
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} // end LineNumberTable
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} // Attributes
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} // end Code
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;
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Attr(#14, 4) { // Exceptions at 0x0132
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[1] { // Exceptions
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#15; // at 0x013C
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}
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} // end Exceptions
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} // Attributes
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}
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} // Methods
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[1] { // Attributes
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Attr(#17, 2) { // SourceFile at 0x013E
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#18;
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} // end SourceFile
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} // Attributes
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} // end class nonVoidInitSigCFE
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// The constant pool in this class contains a cp NameAndType entry (#20) that
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// points to method <init> and signature ()))V. This is an invalid NameAndType
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// entry and should throw a ClassFormatError exception, with a message containing
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// the name <init> and the bad signature, even thought the NameAndType is not
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// referenced by a cp Methodref.
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class voidInitBadSig {
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0xCAFEBABE;
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0; // minor version
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62; // version
|
||||
[21] { // Constant Pool
|
||||
; // first element is empty
|
||||
Method #2 #3; // #1 at 0x0A
|
||||
class #4; // #2 at 0x0F
|
||||
NameAndType #5 #6; // #3 at 0x12
|
||||
Utf8 "java/lang/Object"; // #4 at 0x17
|
||||
Utf8 "<init>"; // #5 at 0x2A
|
||||
Utf8 "()V"; // #6 at 0x33
|
||||
class #8; // #7 at 0x39
|
||||
Utf8 "voidInitBadSig"; // #8 at 0x3C
|
||||
Method #7 #3; // #9 at 0x47
|
||||
Utf8 "Code"; // #10 at 0x4C
|
||||
Utf8 "LineNumberTable"; // #11 at 0x53
|
||||
Utf8 "func"; // #12 at 0x65
|
||||
Utf8 "([Ljava/lang/String;)V"; // #13 at 0x6C
|
||||
Utf8 "Exceptions"; // #14 at 0x85
|
||||
class #16; // #15 at 0x92
|
||||
Utf8 "java/lang/Throwable"; // #16 at 0x95
|
||||
Utf8 "SourceFile"; // #17 at 0xAB
|
||||
Utf8 "voidInitBadSig.java"; // #18 at 0xB8
|
||||
Utf8 "()))V"; // #19
|
||||
NameAndType #5 #19; // #20 // Unused, points to <init>()))V.
|
||||
} // Constant Pool
|
||||
|
||||
0x0021; // access [ ACC_PUBLIC ACC_SUPER ]
|
||||
#7;// this_cpx
|
||||
#2;// super_cpx
|
||||
|
||||
[0] { // Interfaces
|
||||
} // Interfaces
|
||||
|
||||
[0] { // Fields
|
||||
} // Fields
|
||||
|
||||
[2] { // Methods
|
||||
{ // method at 0xD4
|
||||
0x0001; // access
|
||||
#5; // name_index : <init>
|
||||
#6; // descriptor_index : ()V
|
||||
[1] { // Attributes
|
||||
Attr(#10, 29) { // Code at 0xDC
|
||||
1; // max_stack
|
||||
1; // max_locals
|
||||
Bytes[5]{
|
||||
0x2AB70001B1;
|
||||
}
|
||||
[0] { // Traps
|
||||
} // end Traps
|
||||
[1] { // Attributes
|
||||
Attr(#11, 6) { // LineNumberTable at 0xF3
|
||||
[1] { // line_number_table
|
||||
0 1; // at 0xFF
|
||||
}
|
||||
} // end LineNumberTable
|
||||
} // Attributes
|
||||
} // end Code
|
||||
} // Attributes
|
||||
}
|
||||
;
|
||||
{ // method at 0xFF
|
||||
0x0009; // access
|
||||
#12; // name_index : func
|
||||
#13; // descriptor_index : ([Ljava/lang/String;)V
|
||||
[2] { // Attributes
|
||||
Attr(#10, 37) { // Code at 0x0107
|
||||
2; // max_stack
|
||||
2; // max_locals
|
||||
Bytes[9]{
|
||||
0xBB000759B700094C;
|
||||
0xB1;
|
||||
}
|
||||
[0] { // Traps
|
||||
} // end Traps
|
||||
[1] { // Attributes
|
||||
Attr(#11, 10) { // LineNumberTable at 0x0122
|
||||
[2] { // line_number_table
|
||||
0 4; // at 0x012E
|
||||
8 5; // at 0x0132
|
||||
}
|
||||
} // end LineNumberTable
|
||||
} // Attributes
|
||||
} // end Code
|
||||
;
|
||||
Attr(#14, 4) { // Exceptions at 0x0132
|
||||
[1] { // Exceptions
|
||||
#15; // at 0x013C
|
||||
}
|
||||
} // end Exceptions
|
||||
} // Attributes
|
||||
}
|
||||
} // Methods
|
||||
|
||||
[1] { // Attributes
|
||||
Attr(#17, 2) { // SourceFile at 0x013E
|
||||
#18;
|
||||
} // end SourceFile
|
||||
} // Attributes
|
||||
} // end class voidInitBadSig
|
||||
Loading…
x
Reference in New Issue
Block a user