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8291360: Create entry points to expose low-level class file information

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Reviewed-by: dholmes, rriggs
This commit is contained in:
Harold Seigel 2022-08-04 13:13:01 +00:00
parent ce61eb6ff9
commit a3040fcc2b
9 changed files with 812 additions and 1 deletions
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1
make/data/hotspot-symbols/symbols-unix
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@ -81,6 +81,7 @@ JVM_GetClassDeclaredConstructors
JVM_GetClassDeclaredFields
JVM_GetClassDeclaredMethods
JVM_GetClassFieldsCount
JVM_GetClassFileVersion
JVM_GetClassInterfaces
JVM_GetClassMethodsCount
JVM_GetClassModifiers

6
src/hotspot/share/include/jvm.h
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@ -1159,6 +1159,12 @@ JVM_VirtualThreadUnmountBegin(JNIEnv* env, jobject vthread, jboolean last_unmoun
JNIEXPORT void JNICALL
JVM_VirtualThreadUnmountEnd(JNIEnv* env, jobject vthread, jboolean last_unmount);
/*
* Core reflection support.
*/
JNIEXPORT jint JNICALL
JVM_GetClassFileVersion(JNIEnv *env, jclass current);
/*
* This structure is used by the launcher to get the default thread
* stack size from the VM using JNI_GetDefaultJavaVMInitArgs() with a

19
src/hotspot/share/prims/jvm.cpp
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@ -4044,3 +4044,22 @@ JVM_ENTRY(void, JVM_VirtualThreadUnmountEnd(JNIEnv* env, jobject vthread, jboole
fatal("Should only be called with JVMTI enabled");
#endif
JVM_END
/*
* Return the current class's class file version. The low order 16 bits of the
* returned jint contain the class's major version. The high order 16 bits
* contain the class's minor version.
*/
JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
oop mirror = JNIHandles::resolve_non_null(current);
if (java_lang_Class::is_primitive(mirror)) {
// return latest major version and minor version of 0.
return JVM_CLASSFILE_MAJOR_VERSION;
}
assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
Klass* c = java_lang_Class::as_Klass(mirror);
assert(c->is_instance_klass(), "must be");
InstanceKlass* ik = InstanceKlass::cast(c);
return (ik->minor_version() << 16) | ik->major_version();
JVM_END

30
src/java.base/share/classes/java/lang/Class.java
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@ -4668,4 +4668,34 @@ public final class Class<T> implements java.io.Serializable,
}
private native Class<?>[] getPermittedSubclasses0();
/*
* Return the class's major and minor class file version packed into an int.
* The high order 16 bits contain the class's minor version. The low order
* 16 bits contain the class's major version.
*
* If the class is an array type then the class file version of its element
* type is returned. If the class is a primitive type then the latest class
* file major version is returned and zero is returned for the minor version.
*/
private int getClassFileVersion() {
Class<?> c = isArray() ? elementType() : this;
return c.getClassFileVersion0();
}
private native int getClassFileVersion0();
/*
* Return the access flags as they were in the class's bytecode, including
* the original setting of ACC_SUPER.
*
* If the class is an array type then the access flags of the element type is
* returned. If the class is a primitive then ACC_ABSTRACT | ACC_FINAL | ACC_PUBLIC.
*/
private int getClassAccessFlagsRaw() {
Class<?> c = isArray() ? elementType() : this;
return c.getClassAccessFlagsRaw0();
}
private native int getClassAccessFlagsRaw0();
}

4
src/java.base/share/native/libjava/Class.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 1994, 2020, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1994, 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -82,6 +82,8 @@ static JNINativeMethod methods[] = {
{"getRecordComponents0", "()[" RC, (void *)&JVM_GetRecordComponents},
{"isRecord0", "()Z", (void *)&JVM_IsRecord},
{"getPermittedSubclasses0", "()[" CLS, (void *)&JVM_GetPermittedSubclasses},
{"getClassFileVersion0", "()I", (void *)&JVM_GetClassFileVersion},
{"getClassAccessFlagsRaw0", "()I", (void *)&JVM_GetClassAccessFlags},
};
#undef OBJ

78
test/hotspot/jtreg/runtime/ClassFile/ClassAccessFlagsRawTest.java Normal file
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@ -0,0 +1,78 @@
/*
* Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
/**
* @test
* @bug 8291360
* @summary Test getting a class's raw access flags using java.lang.Class API
* @modules java.base/java.lang:open
* @compile classAccessFlagsRaw.jcod
* @run main/othervm ClassAccessFlagsRawTest
*/
import java.lang.reflect.*;
public class ClassAccessFlagsRawTest {
static Method m;
public static void testIt(String className, int expectedResult) throws Exception {
Class<?> testClass = Class.forName(className);
int flags = (int)m.invoke(testClass);
if (flags != expectedResult) {
throw new RuntimeException(
"expected 0x" + Integer.toHexString(expectedResult) + ", got 0x" + Integer.toHexString(flags) + " for class " + className);
}
}
public static void main(String argv[]) throws Throwable {
Class<?> cl = java.lang.Class.class;
m = cl.getDeclaredMethod("getClassAccessFlagsRaw", new Class[0]);
m.setAccessible(true);
testIt("SUPERset", 0x21); // ACC_SUPER 0x20 + ACC_PUBLIC 0x1
testIt("SUPERnotset", Modifier.PUBLIC);
// test primitive array. should return ACC_ABSTRACT | ACC_FINAL | ACC_PUBLIC.
int flags = (int)m.invoke((new int[3]).getClass());
if (flags != (Modifier.ABSTRACT | Modifier.FINAL | Modifier.PUBLIC)) {
throw new RuntimeException(
"expected 0x411, got 0x" + Integer.toHexString(flags) + " for primitive array");
}
// test object array. should return flags of component.
flags = (int)m.invoke((new SUPERnotset[2]).getClass());
if (flags != Modifier.PUBLIC) {
throw new RuntimeException(
"expected 0x1, got 0x" + Integer.toHexString(flags) + " for object array");
}
// test multi-dimensional object array. should return flags of component.
flags = (int)m.invoke((new SUPERnotset[4][2]).getClass());
if (flags != Modifier.PUBLIC) {
throw new RuntimeException(
"expected 0x1, got 0x" + Integer.toHexString(flags) + " for object array");
}
}
}

91
test/hotspot/jtreg/runtime/ClassFile/ClassFileVersionTest.java Normal file
View File

@ -0,0 +1,91 @@
/*
* Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
/**
* @test
* @bug 8291360
* @summary Test getting the class file version for java.lang.Class API
* @modules java.base/java.lang:open
* @compile classFileVersions.jcod
* @run main/othervm --enable-preview ClassFileVersionTest
*/
import java.lang.reflect.*;
public class ClassFileVersionTest {
static Method m;
public static void testIt(String className, int expectedResult) throws Exception {
Class<?> testClass = Class.forName(className);
int ver = (int)m.invoke(testClass);
if (ver != expectedResult) {
int exp_minor = (expectedResult >> 16) & 0x0000FFFF;
int exp_major = expectedResult & 0x0000FFFF;
int got_minor = (ver >> 16) & 0x0000FFFF;
int got_major = ver & 0x0000FFFF;
throw new RuntimeException(
"Expected " + exp_minor + ":" + exp_major + " but got " + got_minor + ":" + got_major);
}
}
public static void main(String argv[]) throws Throwable {
Class<?> cl = java.lang.Class.class;
m = cl.getDeclaredMethod("getClassFileVersion", new Class[0]);
m.setAccessible(true);
testIt("Version64", 64);
testIt("Version59", 59);
testIt("Version45_3", 0x3002D); // 3:45
// test minor version of 65535.
testIt("Version64_65535", 0xFFFF0040); // 0xFFFF0040 = 65535:64
// test primitive array. should return latest version.
int ver = (int)m.invoke((new int[3]).getClass());
if (ver != 64) {
int got_minor = (ver >> 16) & 0x0000FFFF;
int got_major = ver & 0x0000FFFF;
throw new RuntimeException(
"Expected 0:64, but got " + got_minor + ":" + got_major + " for primitive array");
}
// test object array. should return class file version of component.
ver = (int)m.invoke((new Version59[2]).getClass());
if (ver != 59) {
int got_minor = (ver >> 16) & 0x0000FFFF;
int got_major = ver & 0x0000FFFF;
throw new RuntimeException(
"Expected 0:59, but got " + got_minor + ":" + got_major + " for object array");
}
// test multi-dimensional object array. should return class file version of component.
ver = (int)m.invoke((new Version59[3][2]).getClass());
if (ver != 59) {
int got_minor = (ver >> 16) & 0x0000FFFF;
int got_major = ver & 0x0000FFFF;
throw new RuntimeException(
"Expected 0:59, but got " + got_minor + ":" + got_major + " for object array");
}
}
}

202
test/hotspot/jtreg/runtime/ClassFile/classAccessFlagsRaw.jcod Normal file
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@ -0,0 +1,202 @@
/*
* Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
// Class with ACC_SUPER set
class SUPERset {
0xCAFEBABE;
0; // minor version
64; // version
[14] { // 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 "SUPERset"; // #8 at 0x3C
Utf8 "Code"; // #9 at 0x48
Utf8 "LineNumberTable"; // #10 at 0x4F
Utf8 "hi"; // #11 at 0x61
Utf8 "SourceFile"; // #12 at 0x66
Utf8 "SUPERset.java"; // #13 at 0x73
} // Constant Pool
0x0021; // access [ ACC_PUBLIC ACC_SUPER ]
#7;// this_cpx
#2;// super_cpx
[0] { // Interfaces
} // Interfaces
[0] { // Fields
} // Fields
[2] { // Methods
{ // method at 0x90
0x0001; // access
#5; // name_index : <init>
#6; // descriptor_index : ()V
[1] { // Attributes
Attr(#9, 29) { // Code at 0x98
1; // max_stack
1; // max_locals
Bytes[5]{
0x2AB70001B1;
}
[0] { // Traps
} // end Traps
[1] { // Attributes
Attr(#10, 6) { // LineNumberTable at 0xAF
[1] { // line_number_table
0 1; // at 0xBB
}
} // end LineNumberTable
} // Attributes
} // end Code
} // Attributes
}
;
{ // method at 0xBB
0x0009; // access
#11; // name_index : hi
#6; // descriptor_index : ()V
[1] { // Attributes
Attr(#9, 25) { // Code at 0xC3
0; // max_stack
0; // max_locals
Bytes[1]{
0xB1;
}
[0] { // Traps
} // end Traps
[1] { // Attributes
Attr(#10, 6) { // LineNumberTable at 0xD6
[1] { // line_number_table
0 2; // at 0xE2
}
} // end LineNumberTable
} // Attributes
} // end Code
} // Attributes
}
} // Methods
[1] { // Attributes
Attr(#12, 2) { // SourceFile at 0xE4
#13;
} // end SourceFile
} // Attributes
} // end class SUPERset
// Class with ACC_SUPER not set
class SUPERnotset {
0xCAFEBABE;
0; // minor version
64; // version
[14] { // 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 "SUPERnotset"; // #8 at 0x3C
Utf8 "Code"; // #9 at 0x48
Utf8 "LineNumberTable"; // #10 at 0x4F
Utf8 "hi"; // #11 at 0x61
Utf8 "SourceFile"; // #12 at 0x66
Utf8 "SUPERnotset.java"; // #13 at 0x73
} // Constant Pool
0x0001; // access [ ACC_PUBLIC ]
#7;// this_cpx
#2;// super_cpx
[0] { // Interfaces
} // Interfaces
[0] { // Fields
} // Fields
[2] { // Methods
{ // method at 0x90
0x0001; // access
#5; // name_index : <init>
#6; // descriptor_index : ()V
[1] { // Attributes
Attr(#9, 29) { // Code at 0x98
1; // max_stack
1; // max_locals
Bytes[5]{
0x2AB70001B1;
}
[0] { // Traps
} // end Traps
[1] { // Attributes
Attr(#10, 6) { // LineNumberTable at 0xAF
[1] { // line_number_table
0 1; // at 0xBB
}
} // end LineNumberTable
} // Attributes
} // end Code
} // Attributes
}
;
{ // method at 0xBB
0x0009; // access
#11; // name_index : hi
#6; // descriptor_index : ()V
[1] { // Attributes
Attr(#9, 25) { // Code at 0xC3
0; // max_stack
0; // max_locals
Bytes[1]{
0xB1;
}
[0] { // Traps
} // end Traps
[1] { // Attributes
Attr(#10, 6) { // LineNumberTable at 0xD6
[1] { // line_number_table
0 2; // at 0xE2
}
} // end LineNumberTable
} // Attributes
} // end Code
} // Attributes
}
} // Methods
[1] { // Attributes
Attr(#12, 2) { // SourceFile at 0xE4
#13;
} // end SourceFile
} // Attributes
} // end class SUPERnotset

382
test/hotspot/jtreg/runtime/ClassFile/classFileVersions.jcod Normal file
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@ -0,0 +1,382 @@
/*
* Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
// Class with major version 64 and minor version 0
class Version64 {
0xCAFEBABE;
0; // minor version
64; // version
[14] { // 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 "Version64"; // #8 at 0x3C
Utf8 "Code"; // #9 at 0x48
Utf8 "LineNumberTable"; // #10 at 0x4F
Utf8 "hi"; // #11 at 0x61
Utf8 "SourceFile"; // #12 at 0x66
Utf8 "Version64.java"; // #13 at 0x73
} // Constant Pool
0x0021; // access [ ACC_PUBLIC ACC_SUPER ]
#7;// this_cpx
#2;// super_cpx
[0] { // Interfaces
} // Interfaces
[0] { // Fields
} // Fields
[2] { // Methods
{ // method at 0x90
0x0001; // access
#5; // name_index : <init>
#6; // descriptor_index : ()V
[1] { // Attributes
Attr(#9, 29) { // Code at 0x98
1; // max_stack
1; // max_locals
Bytes[5]{
0x2AB70001B1;
}
[0] { // Traps
} // end Traps
[1] { // Attributes
Attr(#10, 6) { // LineNumberTable at 0xAF
[1] { // line_number_table
0 1; // at 0xBB
}
} // end LineNumberTable
} // Attributes
} // end Code
} // Attributes
}
;
{ // method at 0xBB
0x0009; // access
#11; // name_index : hi
#6; // descriptor_index : ()V
[1] { // Attributes
Attr(#9, 25) { // Code at 0xC3
0; // max_stack
0; // max_locals
Bytes[1]{
0xB1;
}
[0] { // Traps
} // end Traps
[1] { // Attributes
Attr(#10, 6) { // LineNumberTable at 0xD6
[1] { // line_number_table
0 2; // at 0xE2
}
} // end LineNumberTable
} // Attributes
} // end Code
} // Attributes
}
} // Methods
[1] { // Attributes
Attr(#12, 2) { // SourceFile at 0xE4
#13;
} // end SourceFile
} // Attributes
} // end class Version64
// Class with major version 59 and minor version 0
class Version59 {
0xCAFEBABE;
0; // minor version
59; // version
[14] { // 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 "Version59"; // #8 at 0x3C
Utf8 "Code"; // #9 at 0x48
Utf8 "LineNumberTable"; // #10 at 0x4F
Utf8 "hi"; // #11 at 0x61
Utf8 "SourceFile"; // #12 at 0x66
Utf8 "Version59.java"; // #13 at 0x73
} // Constant Pool
0x0021; // access [ ACC_PUBLIC ACC_SUPER ]
#7;// this_cpx
#2;// super_cpx
[0] { // Interfaces
} // Interfaces
[0] { // Fields
} // Fields
[2] { // Methods
{ // method at 0x90
0x0001; // access
#5; // name_index : <init>
#6; // descriptor_index : ()V
[1] { // Attributes
Attr(#9, 29) { // Code at 0x98
1; // max_stack
1; // max_locals
Bytes[5]{
0x2AB70001B1;
}
[0] { // Traps
} // end Traps
[1] { // Attributes
Attr(#10, 6) { // LineNumberTable at 0xAF
[1] { // line_number_table
0 1; // at 0xBB
}
} // end LineNumberTable
} // Attributes
} // end Code
} // Attributes
}
;
{ // method at 0xBB
0x0009; // access
#11; // name_index : hi
#6; // descriptor_index : ()V
[1] { // Attributes
Attr(#9, 25) { // Code at 0xC3
0; // max_stack
0; // max_locals
Bytes[1]{
0xB1;
}
[0] { // Traps
} // end Traps
[1] { // Attributes
Attr(#10, 6) { // LineNumberTable at 0xD6
[1] { // line_number_table
0 2; // at 0xE2
}
} // end LineNumberTable
} // Attributes
} // end Code
} // Attributes
}
} // Methods
[1] { // Attributes
Attr(#12, 2) { // SourceFile at 0xE4
#13;
} // end SourceFile
} // Attributes
} // end class Version59
// Class with major version 64 and minor version 65535
class Version64_65535 {
0xCAFEBABE;
65535; // minor version
64; // version
[14] { // 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 "Version64_65535"; // #8 at 0x3C
Utf8 "Code"; // #9 at 0x48
Utf8 "LineNumberTable"; // #10 at 0x4F
Utf8 "hi"; // #11 at 0x61
Utf8 "SourceFile"; // #12 at 0x66
Utf8 "Version64_65535.java"; // #13 at 0x73
} // Constant Pool
0x0021; // access [ ACC_PUBLIC ACC_SUPER ]
#7;// this_cpx
#2;// super_cpx
[0] { // Interfaces
} // Interfaces
[0] { // Fields
} // Fields
[2] { // Methods
{ // method at 0x90
0x0001; // access
#5; // name_index : <init>
#6; // descriptor_index : ()V
[1] { // Attributes
Attr(#9, 29) { // Code at 0x98
1; // max_stack
1; // max_locals
Bytes[5]{
0x2AB70001B1;
}
[0] { // Traps
} // end Traps
[1] { // Attributes
Attr(#10, 6) { // LineNumberTable at 0xAF
[1] { // line_number_table
0 1; // at 0xBB
}
} // end LineNumberTable
} // Attributes
} // end Code
} // Attributes
}
;
{ // method at 0xBB
0x0009; // access
#11; // name_index : hi
#6; // descriptor_index : ()V
[1] { // Attributes
Attr(#9, 25) { // Code at 0xC3
0; // max_stack
0; // max_locals
Bytes[1]{
0xB1;
}
[0] { // Traps
} // end Traps
[1] { // Attributes
Attr(#10, 6) { // LineNumberTable at 0xD6
[1] { // line_number_table
0 2; // at 0xE2
}
} // end LineNumberTable
} // Attributes
} // end Code
} // Attributes
}
} // Methods
[1] { // Attributes
Attr(#12, 2) { // SourceFile at 0xE4
#13;
} // end SourceFile
} // Attributes
} // end class Version64_65535
// Class with major version 45 and minor version 3
class Version45_3 {
0xCAFEBABE;
3; // minor version
45; // version
[14] { // 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 "Version45_3"; // #8 at 0x3C
Utf8 "Code"; // #9 at 0x48
Utf8 "LineNumberTable"; // #10 at 0x4F
Utf8 "hi"; // #11 at 0x61
Utf8 "SourceFile"; // #12 at 0x66
Utf8 "Version45_3.java"; // #13 at 0x73
} // Constant Pool
0x0021; // access [ ACC_PUBLIC ACC_SUPER ]
#7;// this_cpx
#2;// super_cpx
[0] { // Interfaces
} // Interfaces
[0] { // Fields
} // Fields
[2] { // Methods
{ // method at 0x90
0x0001; // access
#5; // name_index : <init>
#6; // descriptor_index : ()V
[1] { // Attributes
Attr(#9, 29) { // Code at 0x98
1; // max_stack
1; // max_locals
Bytes[5]{
0x2AB70001B1;
}
[0] { // Traps
} // end Traps
[1] { // Attributes
Attr(#10, 6) { // LineNumberTable at 0xAF
[1] { // line_number_table
0 1; // at 0xBB
}
} // end LineNumberTable
} // Attributes
} // end Code
} // Attributes
}
;
{ // method at 0xBB
0x0009; // access
#11; // name_index : hi
#6; // descriptor_index : ()V
[1] { // Attributes
Attr(#9, 25) { // Code at 0xC3
0; // max_stack
0; // max_locals
Bytes[1]{
0xB1;
}
[0] { // Traps
} // end Traps
[1] { // Attributes
Attr(#10, 6) { // LineNumberTable at 0xD6
[1] { // line_number_table
0 2; // at 0xE2
}
} // end LineNumberTable
} // Attributes
} // end Code
} // Attributes
}
} // Methods
[1] { // Attributes
Attr(#12, 2) { // SourceFile at 0xE4
#13;
} // end SourceFile
} // Attributes
} // end class Version45_3