Java example source code file (ByteCodeTest.java)
The ByteCodeTest.java Java example source code
/*
* Copyright (c) 2013, 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 8011738
* @author sogoel
* @summary Code translation test for Lambda expressions, method references
* @run main ByteCodeTest
*/
import com.sun.tools.classfile.Attribute;
import com.sun.tools.classfile.BootstrapMethods_attribute;
import com.sun.tools.classfile.ClassFile;
import com.sun.tools.classfile.ConstantPool;
import com.sun.tools.classfile.ConstantPoolException;
import com.sun.tools.classfile.ConstantPool.*;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
public class ByteCodeTest {
static boolean IS_DEBUG = false;
public static void main(String[] args) {
File classFile = null;
int err = 0;
boolean verifyResult = false;
for(TestCases tc : TestCases.values()) {
classFile = getCompiledFile(tc.name(), tc.srcCode);
if(classFile == null) { // either testFile or classFile was not created
err++;
} else {
verifyResult = verifyClassFileAttributes(classFile, tc);
if(!verifyResult)
System.out.println("Bootstrap class file attributes did not match for " + tc.name());
}
}
if(err > 0)
throw new RuntimeException("Found " + err + " found");
else
System.out.println("Test passed");
}
private static boolean verifyClassFileAttributes(File classFile, TestCases tc) {
ClassFile c = null;
try {
c = ClassFile.read(classFile);
} catch (IOException | ConstantPoolException e) {
e.printStackTrace();
}
ConstantPoolVisitor cpv = new ConstantPoolVisitor(c, c.constant_pool.size());
Map<Integer, String> hm = cpv.getBSMMap();
List<String> expectedValList = tc.getExpectedArgValues();
expectedValList.add(tc.bsmSpecifier.specifier);
if(!(hm.values().containsAll(new HashSet<String>(expectedValList)))) {
System.out.println("Values do not match");
return false;
}
return true;
}
private static File getCompiledFile(String fname, String srcString) {
File testFile = null, classFile = null;
boolean isTestFileCreated = true;
try {
testFile = writeTestFile(fname+".java", srcString);
} catch(IOException ioe) {
isTestFileCreated = false;
System.err.println("fail to write" + ioe);
}
if(isTestFileCreated) {
try {
classFile = compile(testFile);
} catch (Error err) {
System.err.println("fail compile. Source:\n" + srcString);
throw err;
}
}
return classFile;
}
static File writeTestFile(String fname, String source) throws IOException {
File f = new File(fname);
PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(f)));
out.println(source);
out.close();
return f;
}
static File compile(File f) {
int rc = com.sun.tools.javac.Main.compile(new String[] {
"-source", "1.8", "-g", f.getPath() });
if (rc != 0)
throw new Error("compilation failed. rc=" + rc);
String path = f.getPath();
return new File(path.substring(0, path.length() - 5) + ".class");
}
static void debugln(String str) {
if(IS_DEBUG)
System.out.println(str);
}
enum BSMSpecifier {
SPECIFIER1("REF_invokeStatic java/lang/invoke/LambdaMetafactory metaFactory " +
"(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;" +
"Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)" +
"Ljava/lang/invoke/CallSite;"),
SPECIFIER2("REF_invokeStatic java/lang/invoke/LambdaMetafactory altMetaFactory " +
"(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;" +
"[Ljava/lang/Object;)Ljava/lang/invoke/CallSite;");
String specifier;
private BSMSpecifier(String specifier) {
this.specifier = specifier;
}
}
enum TestCases {
// Single line lambda expression
TC1("class TC1 {\n" +
" public static void main(String[] args) {\n" +
" Object o = (Runnable) () -> { System.out.println(\"hi\");};\n" +
" }\n"+
"}", BSMSpecifier.SPECIFIER1) {
@Override
List<String> getExpectedArgValues() {
List<String> valList = new ArrayList<>();
valList.add("REF_invokeInterface java/lang/Runnable run ()V");
valList.add("REF_invokeStatic TC1 lambda$0 ()V");
valList.add("()V");
return valList;
}
},
// Lambda expression in a for loop
TC2("import java.util.*;\n" +
"public class TC2 {\n" +
" void TC2_test() {\n" +
" List<String> list = new ArrayList<>();\n" +
" list.add(\"A\");\n" +
" list.add(\"B\");\n" +
" list.stream().forEach( s -> { System.out.println(s); } );\n" +
" }\n" +
" public static void main(String[] args) {\n" +
" new TC2().TC2_test();\n" +
" }\n" +
"}", BSMSpecifier.SPECIFIER1) {
@Override
List<String> getExpectedArgValues() {
List<String> valList = new ArrayList<>();
valList.add("REF_invokeInterface java/util/function/Consumer accept (Ljava/lang/Object;)V");
valList.add("REF_invokeStatic TC2 lambda$0 (Ljava/lang/String;)V");
valList.add("(Ljava/lang/String;)V");
return valList;
}
},
// Lambda initializer
TC3("class TC3 {\n" +
" interface SAM {\n" +
" void m(int i);\n" +
" }\n" +
" SAM lambda_03 = (int pos) -> { };\n" +
"}", BSMSpecifier.SPECIFIER1) {
@Override
List<String> getExpectedArgValues() {
List<String> valList = new ArrayList<>();
valList.add("REF_invokeInterface TC3$SAM m (I)V");
valList.add("REF_invokeStatic TC3 lambda$0 (I)V");
valList.add("(I)V");
return valList;
}
},
// Array initializer
TC4("class TC4 {\n" +
" interface Block<T> {\n" +
" void m(T t);\n" +
" }\n" +
" void test1() {\n" +
" Block<?>[] arr1 = { t -> { }, t -> { } };\n" +
" }\n" +
"}", BSMSpecifier.SPECIFIER1) {
@Override
List<String> getExpectedArgValues() {
List<String> valList = new ArrayList<>();
valList.add("REF_invokeInterface TC4$Block m (Ljava/lang/Object;)V");
valList.add("REF_invokeStatic TC4 lambda$0 (Ljava/lang/Object;)V");
valList.add("(Ljava/lang/Object;)V");
valList.add("REF_invokeStatic TC4 lambda$1 (Ljava/lang/Object;)V");
return valList;
}
},
//Lambda expression as a method arg
TC5("class TC5 {\n"+
" interface MapFun<T,R> { R m( T n); }\n" +
" void meth( MapFun<String,Integer> mf ) {\n" +
" assert( mf.m(\"four\") == 4);\n" +
" }\n"+
" void test(Integer i) {\n" +
" meth(s -> { Integer len = s.length(); return len; } );\n" +
" }\n"+
"}", BSMSpecifier.SPECIFIER1) {
@Override
List<String> getExpectedArgValues() {
List<String> valList = new ArrayList<>();
valList.add("REF_invokeInterface TC5$MapFun m (Ljava/lang/Object;)Ljava/lang/Object;");
valList.add("REF_invokeStatic TC5 lambda$0 (Ljava/lang/String;)Ljava/lang/Integer;");
valList.add("(Ljava/lang/String;)Ljava/lang/Integer;");
return valList;
}
},
//Inner class of Lambda expression
TC6("class TC6 {\n" +
" interface MapFun<T, R> { R m( T n); }\n" +
" MapFun<Class cs;\n" +
" void test() {\n" +
" cs = c -> {\n" +
" class innerClass {\n" +
" Class<?> icc;\n" +
" innerClass(Class<?> _c) { icc = _c; }\n" +
" String getString() { return icc.toString(); }\n" +
" }\n" +
" return new innerClass(c).getString();\n"+
" };\n" +
" }\n" +
"}\n", BSMSpecifier.SPECIFIER1) {
@Override
List<String> getExpectedArgValues() {
List<String> valList = new ArrayList<>();
valList.add("REF_invokeInterface TC6$MapFun m (Ljava/lang/Object;)Ljava/lang/Object;");
valList.add("REF_invokeSpecial TC6 lambda$0 (Ljava/lang/Class;)Ljava/lang/String;");
valList.add("(Ljava/lang/Class;)Ljava/lang/String;");
return valList;
}
},
// Method reference
TC7("class TC7 {\n" +
" static interface SAM {\n" +
" void m(Integer i);\n" +
" }\n" +
" void m(Integer i) {}\n" +
" SAM s = this::m;\n" +
"}\n", BSMSpecifier.SPECIFIER1) {
@Override
List<String> getExpectedArgValues() {
List<String> valList = new ArrayList<>();
valList.add("REF_invokeInterface TC7$SAM m (Ljava/lang/Integer;)V");
valList.add("REF_invokeVirtual TC7 m (Ljava/lang/Integer;)V");
valList.add("(Ljava/lang/Integer;)V");
return valList;
}
},
// Constructor reference
TC8("public class TC8 {\n" +
" static interface A {Fee<String> m();}\n" +
" static class Fee<T> {\n" +
" private T t;\n" +
" public Fee() {}\n" +
" }\n" +
" public static void main(String[] args) {\n" +
" A a = Fee<String>::new; \n" +
" }\n" +
"}\n", BSMSpecifier.SPECIFIER1) {
@Override
List<String> getExpectedArgValues() {
List<String> valList = new ArrayList<>();
valList.add("REF_invokeInterface TC8$A m ()LTC8$Fee;");
valList.add("REF_newInvokeSpecial TC8$Fee <init> ()V");
valList.add("()LTC8$Fee;");
return valList;
}
},
// Recursive lambda expression
TC9("class TC9 {\n" +
" interface Recursive<T, R> { T apply(R n); };\n" +
" Recursive<Integer,Integer> factorial;\n" +
" void test(Integer j) {\n" +
" factorial = i -> { return i == 0 ? 1 : i * factorial.apply( i - 1 ); };\n" +
" }\n" +
"}\n", BSMSpecifier.SPECIFIER1) {
@Override
List<String> getExpectedArgValues() {
List<String> valList = new ArrayList<>();
valList.add("REF_invokeInterface TC9$Recursive apply (Ljava/lang/Object;)Ljava/lang/Object;");
valList.add("REF_invokeSpecial TC9 lambda$0 (Ljava/lang/Integer;)Ljava/lang/Integer;");
valList.add("(Ljava/lang/Integer;)Ljava/lang/Integer;");
return valList;
}
},
//Serializable Lambda
TC10("import java.io.Serializable;\n" +
"class TC10 {\n" +
" interface Foo { int m(); }\n" +
" public static void main(String[] args) {\n" +
" Foo f1 = (Foo & Serializable)() -> 3;\n" +
" }\n" +
"}\n", BSMSpecifier.SPECIFIER2) {
@Override
List<String> getExpectedArgValues() {
List<String> valList = new ArrayList<>();
valList.add("REF_invokeStatic java/lang/invoke/LambdaMetafactory altMetaFactory (Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;[Ljava/lang/Object;)Ljava/lang/invoke/CallSite;");
valList.add("REF_invokeInterface TC10$Foo m ()I");
valList.add("REF_invokeStatic TC10 lambda$main$3231c38a$0 ()I");
valList.add("()I");
valList.add("1");
return valList;
}
};
String srcCode;
BSMSpecifier bsmSpecifier;
TestCases(String src, BSMSpecifier bsmSpecifier) {
this.srcCode = src;
// By default, all test cases will have bootstrap method specifier as Lambda.MetaFactory
// For serializable lambda test cases, bootstrap method specifier changed to altMetaFactory
this.bsmSpecifier = bsmSpecifier;
}
List<String> getExpectedArgValues() {
return null;
}
void setSrcCode(String src) {
srcCode = src;
}
}
static class ConstantPoolVisitor implements ConstantPool.Visitor<String, Integer> {
final List<String> slist;
final ClassFile cf;
final ConstantPool cfpool;
final Map<Integer, String> bsmMap;
public ConstantPoolVisitor(ClassFile cf, int size) {
slist = new ArrayList<>(size);
for (int i = 0 ; i < size; i++) {
slist.add(null);
}
this.cf = cf;
this.cfpool = cf.constant_pool;
bsmMap = readBSM();
}
public Map<Integer, String> getBSMMap() {
return Collections.unmodifiableMap(bsmMap);
}
public String visit(CPInfo c, int index) {
return c.accept(this, index);
}
private Map<Integer, String> readBSM() {
BootstrapMethods_attribute bsmAttr =
(BootstrapMethods_attribute) cf.getAttribute(Attribute.BootstrapMethods);
if (bsmAttr != null) {
Map<Integer, String> out =
new HashMap<>(bsmAttr.bootstrap_method_specifiers.length);
for (BootstrapMethods_attribute.BootstrapMethodSpecifier bsms :
bsmAttr.bootstrap_method_specifiers) {
int index = bsms.bootstrap_method_ref;
try {
String value = slist.get(index);
if (value == null) {
value = visit(cfpool.get(index), index);
debugln("[SG]: index " + index);
debugln("[SG]: value " + value);
slist.set(index, value);
out.put(index, value);
}
for (int idx : bsms.bootstrap_arguments) {
value = slist.get(idx);
if (value == null) {
value = visit(cfpool.get(idx), idx);
debugln("[SG]: idx " + idx);
debugln("[SG]: value " + value);
slist.set(idx, value);
out.put(idx, value);
}
}
} catch (InvalidIndex ex) {
ex.printStackTrace();
}
}
return out;
}
return new HashMap<>(0);
}
@Override
public String visitClass(CONSTANT_Class_info c, Integer p) {
String value = slist.get(p);
if (value == null) {
try {
value = visit(cfpool.get(c.name_index), c.name_index);
slist.set(p, value);
} catch (ConstantPoolException ex) {
ex.printStackTrace();
}
}
return value;
}
@Override
public String visitDouble(CONSTANT_Double_info c, Integer p) {
String value = slist.get(p);
if (value == null) {
value = Double.toString(c.value);
slist.set(p, value);
}
return value;
}
@Override
public String visitFieldref(CONSTANT_Fieldref_info c, Integer p) {
String value = slist.get(p);
if (value == null) {
try {
value = visit(cfpool.get(c.class_index), c.class_index);
value = value.concat(" " + visit(cfpool.get(c.name_and_type_index),
c.name_and_type_index));
slist.set(p, value);
} catch (ConstantPoolException ex) {
ex.printStackTrace();
}
}
return value;
}
@Override
public String visitFloat(CONSTANT_Float_info c, Integer p) {
String value = slist.get(p);
if (value == null) {
value = Float.toString(c.value);
slist.set(p, value);
}
return value;
}
@Override
public String visitInteger(CONSTANT_Integer_info cnstnt, Integer p) {
String value = slist.get(p);
if (value == null) {
value = Integer.toString(cnstnt.value);
slist.set(p, value);
}
return value;
}
@Override
public String visitInterfaceMethodref(CONSTANT_InterfaceMethodref_info c,
Integer p) {
String value = slist.get(p);
if (value == null) {
try {
value = visit(cfpool.get(c.class_index), c.class_index);
value = value.concat(" " +
visit(cfpool.get(c.name_and_type_index),
c.name_and_type_index));
slist.set(p, value);
} catch (ConstantPoolException ex) {
ex.printStackTrace();
}
}
return value;
}
@Override
public String visitInvokeDynamic(CONSTANT_InvokeDynamic_info c, Integer p) {
String value = slist.get(p);
if (value == null) {
try {
value = bsmMap.get(c.bootstrap_method_attr_index) + " "
+ visit(cfpool.get(c.name_and_type_index), c.name_and_type_index);
slist.set(p, value);
} catch (ConstantPoolException ex) {
ex.printStackTrace();
}
}
return value;
}
@Override
public String visitLong(CONSTANT_Long_info c, Integer p) {
String value = slist.get(p);
if (value == null) {
value = Long.toString(c.value);
slist.set(p, value);
}
return value;
}
@Override
public String visitNameAndType(CONSTANT_NameAndType_info c, Integer p) {
String value = slist.get(p);
if (value == null) {
try {
value = visit(cfpool.get(c.name_index), c.name_index);
value = value.concat(" " +
visit(cfpool.get(c.type_index), c.type_index));
slist.set(p, value);
} catch (InvalidIndex ex) {
ex.printStackTrace();
}
}
return value;
}
@Override
public String visitMethodref(CONSTANT_Methodref_info c, Integer p) {
String value = slist.get(p);
if (value == null) {
try {
value = visit(cfpool.get(c.class_index), c.class_index);
value = value.concat(" " +
visit(cfpool.get(c.name_and_type_index),
c.name_and_type_index));
slist.set(p, value);
} catch (ConstantPoolException ex) {
ex.printStackTrace();
}
}
return value;
}
@Override
public String visitMethodHandle(CONSTANT_MethodHandle_info c, Integer p) {
String value = slist.get(p);
if (value == null) {
try {
value = c.reference_kind.name();
value = value.concat(" "
+ visit(cfpool.get(c.reference_index), c.reference_index));
slist.set(p, value);
} catch (ConstantPoolException ex) {
ex.printStackTrace();
}
}
return value;
}
@Override
public String visitMethodType(CONSTANT_MethodType_info c, Integer p) {
String value = slist.get(p);
if (value == null) {
try {
value = visit(cfpool.get(c.descriptor_index), c.descriptor_index);
slist.set(p, value);
} catch (ConstantPoolException ex) {
ex.printStackTrace();
}
}
return value;
}
@Override
public String visitString(CONSTANT_String_info c, Integer p) {
try {
String value = slist.get(p);
if (value == null) {
value = c.getString();
slist.set(p, value);
}
return value;
} catch (ConstantPoolException ex) {
throw new RuntimeException("Fatal error", ex);
}
}
@Override
public String visitUtf8(CONSTANT_Utf8_info cnstnt, Integer p) {
String value = slist.get(p);
if (value == null) {
value = cnstnt.value;
slist.set(p, value);
}
return value;
}
}
}
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