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0c508c8b
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dragonwell8_jdk
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体验新版 GitCode,发现更多精彩内容 >>
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0c508c8b
编写于
6月 17, 2014
作者:
V
vlivanov
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电子邮件补丁
差异文件
8046903: VM anonymous class members can't be statically invocable
Reviewed-by: jrose
上级
b867a6a0
变更
2
隐藏空白更改
内联
并排
Showing
2 changed file
with
123 addition
and
0 deletion
+123
-0
src/share/classes/java/lang/invoke/InvokerBytecodeGenerator.java
...re/classes/java/lang/invoke/InvokerBytecodeGenerator.java
+5
-0
test/java/lang/invoke/VMAnonymousClass.java
test/java/lang/invoke/VMAnonymousClass.java
+118
-0
未找到文件。
src/share/classes/java/lang/invoke/InvokerBytecodeGenerator.java
浏览文件 @
0c508c8b
...
...
@@ -39,6 +39,7 @@ import java.lang.reflect.*;
import
static
java
.
lang
.
invoke
.
MethodHandleStatics
.*;
import
static
java
.
lang
.
invoke
.
MethodHandleNatives
.
Constants
.*;
import
sun.invoke.util.VerifyType
;
import
sun.reflect.misc.ReflectUtil
;
/**
* Code generation backend for LambdaForm.
...
...
@@ -595,6 +596,8 @@ class InvokerBytecodeGenerator {
return
false
;
// inner class of some sort
if
(
cls
.
getClassLoader
()
!=
MethodHandle
.
class
.
getClassLoader
())
return
false
;
// not on BCP
if
(
ReflectUtil
.
isVMAnonymousClass
(
cls
))
// FIXME: switch to supported API once it is added
return
false
;
MethodType
mtype
=
member
.
getMethodOrFieldType
();
if
(!
isStaticallyNameable
(
mtype
.
returnType
()))
return
false
;
...
...
@@ -613,6 +616,8 @@ class InvokerBytecodeGenerator {
cls
=
cls
.
getComponentType
();
if
(
cls
.
isPrimitive
())
return
true
;
// int[].class, for example
if
(
ReflectUtil
.
isVMAnonymousClass
(
cls
))
// FIXME: switch to supported API once it is added
return
false
;
// could use VerifyAccess.isClassAccessible but the following is a safe approximation
if
(
cls
.
getClassLoader
()
!=
Object
.
class
.
getClassLoader
())
return
false
;
...
...
test/java/lang/invoke/VMAnonymousClass.java
0 → 100644
浏览文件 @
0c508c8b
/*
* Copyright (c) 2014, 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 8046903
* @summary VM anonymous class members can't be statically invocable
* @run junit test.java.lang.invoke.VMAnonymousClass
*/
package
test.java.lang.invoke
;
import
java.lang.invoke.MethodHandle
;
import
java.lang.invoke.MethodHandles
;
import
java.lang.invoke.MethodType
;
import
java.lang.reflect.Field
;
import
org.junit.Test
;
import
sun.misc.Unsafe
;
import
jdk.internal.org.objectweb.asm.*
;
import
static
jdk
.
internal
.
org
.
objectweb
.
asm
.
Opcodes
.*;
public
class
VMAnonymousClass
{
public
static
void
main
(
String
[]
args
)
throws
Throwable
{
VMAnonymousClass
test
=
new
VMAnonymousClass
();
test
.
testJavaLang
();
test
.
testJavaUtil
();
test
.
testSunMisc
();
test
.
testJavaLangInvoke
();
System
.
out
.
println
(
"TEST PASSED"
);
}
// Test VM anonymous classes from different packages
// (see j.l.i.InvokerBytecodeGenerator::isStaticallyInvocable).
@Test
public
void
testJavaLang
()
throws
Throwable
{
test
(
"java/lang"
);
}
@Test
public
void
testJavaUtil
()
throws
Throwable
{
test
(
"java/util"
);
}
@Test
public
void
testSunMisc
()
throws
Throwable
{
test
(
"sun/misc"
);
}
@Test
public
void
testJavaLangInvoke
()
throws
Throwable
{
test
(
"java/lang/invoke"
);
}
private
static
Unsafe
unsafe
=
getUnsafe
();
private
static
void
test
(
String
pkg
)
throws
Throwable
{
byte
[]
bytes
=
dumpClass
(
pkg
);
// Define VM anonymous class in privileged context (on BCP).
Class
anonClass
=
unsafe
.
defineAnonymousClass
(
Object
.
class
,
bytes
,
null
);
MethodType
t
=
MethodType
.
methodType
(
Object
.
class
,
int
.
class
);
MethodHandle
target
=
MethodHandles
.
lookup
().
findStatic
(
anonClass
,
"get"
,
t
);
// Wrap target into LF (convert) to get "target" referenced from LF
MethodHandle
wrappedMH
=
target
.
asType
(
MethodType
.
methodType
(
Object
.
class
,
Integer
.
class
));
// Invoke enough times to provoke LF compilation to bytecode.
for
(
int
i
=
0
;
i
<
100
;
i
++)
{
Object
r
=
wrappedMH
.
invokeExact
((
Integer
)
1
);
}
}
/*
* Constructs bytecode for the following class:
* public class pkg.MyClass {
* MyClass() {}
* public Object get(int i) { return null; }
* }
*/
public
static
byte
[]
dumpClass
(
String
pkg
)
{
ClassWriter
cw
=
new
ClassWriter
(
0
);
MethodVisitor
mv
;
cw
.
visit
(
52
,
ACC_SUPER
|
ACC_PUBLIC
,
pkg
+
"/MyClass"
,
null
,
"java/lang/Object"
,
null
);
{
mv
=
cw
.
visitMethod
(
0
,
"<init>"
,
"()V"
,
null
,
null
);
mv
.
visitCode
();
mv
.
visitVarInsn
(
ALOAD
,
0
);
mv
.
visitMethodInsn
(
INVOKESPECIAL
,
"java/lang/Object"
,
"<init>"
,
"()V"
,
false
);
mv
.
visitInsn
(
RETURN
);
mv
.
visitMaxs
(
1
,
1
);
mv
.
visitEnd
();
}
{
mv
=
cw
.
visitMethod
(
ACC_PUBLIC
+
ACC_STATIC
,
"get"
,
"(I)Ljava/lang/Object;"
,
null
,
null
);
mv
.
visitCode
();
mv
.
visitInsn
(
ACONST_NULL
);
mv
.
visitInsn
(
ARETURN
);
mv
.
visitMaxs
(
1
,
1
);
mv
.
visitEnd
();
}
cw
.
visitEnd
();
return
cw
.
toByteArray
();
}
private
static
synchronized
Unsafe
getUnsafe
()
{
try
{
Field
f
=
Unsafe
.
class
.
getDeclaredField
(
"theUnsafe"
);
f
.
setAccessible
(
true
);
return
(
Unsafe
)
f
.
get
(
null
);
}
catch
(
NoSuchFieldException
|
IllegalAccessException
e
)
{
throw
new
RuntimeException
(
"Unable to get Unsafe instance."
,
e
);
}
}
}
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