| /* |
| * Copyright (c) 2010, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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. |
| */ |
| |
| package jdk.nashorn.internal.codegen; |
| |
| import static jdk.internal.org.objectweb.asm.Opcodes.ACC_FINAL; |
| import static jdk.internal.org.objectweb.asm.Opcodes.ACC_PRIVATE; |
| import static jdk.internal.org.objectweb.asm.Opcodes.ACC_PUBLIC; |
| import static jdk.internal.org.objectweb.asm.Opcodes.ACC_STATIC; |
| import static jdk.internal.org.objectweb.asm.Opcodes.ACC_SUPER; |
| import static jdk.internal.org.objectweb.asm.Opcodes.ACC_VARARGS; |
| import static jdk.internal.org.objectweb.asm.Opcodes.H_INVOKEINTERFACE; |
| import static jdk.internal.org.objectweb.asm.Opcodes.H_INVOKESPECIAL; |
| import static jdk.internal.org.objectweb.asm.Opcodes.H_INVOKESTATIC; |
| import static jdk.internal.org.objectweb.asm.Opcodes.H_INVOKEVIRTUAL; |
| import static jdk.internal.org.objectweb.asm.Opcodes.H_NEWINVOKESPECIAL; |
| import static jdk.internal.org.objectweb.asm.Opcodes.V1_7; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.CLINIT; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.CONSTANTS; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.GET_ARRAY_PREFIX; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.GET_ARRAY_SUFFIX; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.GET_MAP; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.GET_STRING; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.INIT; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.SET_MAP; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.SOURCE; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.STRICT_MODE; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.className; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.methodDescriptor; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.typeDescriptor; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.virtualCallNoLookup; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.PrintWriter; |
| import java.security.AccessController; |
| import java.security.PrivilegedAction; |
| import java.util.Collections; |
| import java.util.EnumSet; |
| import java.util.HashSet; |
| import java.util.Set; |
| import jdk.internal.org.objectweb.asm.ClassWriter; |
| import jdk.internal.org.objectweb.asm.MethodVisitor; |
| import jdk.internal.org.objectweb.asm.util.TraceClassVisitor; |
| import jdk.nashorn.internal.codegen.types.Type; |
| import jdk.nashorn.internal.ir.FunctionNode; |
| import jdk.nashorn.internal.ir.debug.NashornClassReader; |
| import jdk.nashorn.internal.ir.debug.NashornTextifier; |
| import jdk.nashorn.internal.runtime.Context; |
| import jdk.nashorn.internal.runtime.PropertyMap; |
| import jdk.nashorn.internal.runtime.RewriteException; |
| import jdk.nashorn.internal.runtime.ScriptObject; |
| import jdk.nashorn.internal.runtime.Source; |
| |
| /** |
| * The interface responsible for speaking to ASM, emitting classes, |
| * fields and methods. |
| * <p> |
| * This file contains the ClassEmitter, which is the master object |
| * responsible for writing byte codes. It utilizes a MethodEmitter |
| * for method generation, which also the NodeVisitors own, to keep |
| * track of the current code generator and what it is doing. |
| * <p> |
| * There is, however, nothing stopping you from using this in a |
| * completely self contained environment, for example in ObjectGenerator |
| * where there are no visitors or external hooks. |
| * <p> |
| * MethodEmitter makes it simple to generate code for methods without |
| * having to do arduous type checking. It maintains a type stack |
| * and will pick the appropriate operation for all operations sent to it |
| * We also allow chained called to a MethodEmitter for brevity, e.g. |
| * it is legal to write _new(className).dup() or |
| * load(slot).load(slot2).xor().store(slot3); |
| * <p> |
| * If running with assertions enabled, any type conflict, such as different |
| * bytecode stack sizes or operating on the wrong type will be detected |
| * and an error thrown. |
| * <p> |
| * There is also a very nice debug interface that can emit formatted |
| * bytecodes that have been written. This is enabled by setting the |
| * environment "nashorn.codegen.debug" to true, or --log=codegen:{@literal <level>} |
| * |
| * @see Compiler |
| */ |
| public class ClassEmitter { |
| /** Default flags for class generation - public class */ |
| private static final EnumSet<Flag> DEFAULT_METHOD_FLAGS = EnumSet.of(Flag.PUBLIC); |
| |
| /** Sanity check flag - have we started on a class? */ |
| private boolean classStarted; |
| |
| /** Sanity check flag - have we ended this emission? */ |
| private boolean classEnded; |
| |
| /** |
| * Sanity checks - which methods have we currently |
| * started for generation in this class? |
| */ |
| private final HashSet<MethodEmitter> methodsStarted; |
| |
| /** The ASM classwriter that we use for all bytecode operations */ |
| protected final ClassWriter cw; |
| |
| /** The script environment */ |
| protected final Context context; |
| |
| /** Compile unit class name. */ |
| private String unitClassName; |
| |
| /** Set of constants access methods required. */ |
| private Set<Class<?>> constantMethodNeeded; |
| |
| private int methodCount; |
| |
| private int initCount; |
| |
| private int clinitCount; |
| |
| private int fieldCount; |
| |
| private final Set<String> methodNames; |
| |
| /** |
| * Constructor - only used internally in this class as it breaks |
| * abstraction towards ASM or other code generator below. |
| * |
| * @param env script environment |
| * @param cw ASM classwriter |
| */ |
| private ClassEmitter(final Context context, final ClassWriter cw) { |
| this.context = context; |
| this.cw = cw; |
| this.methodsStarted = new HashSet<>(); |
| this.methodNames = new HashSet<>(); |
| } |
| |
| /** |
| * Return the method names encountered. |
| * |
| * @return method names |
| */ |
| public Set<String> getMethodNames() { |
| return Collections.unmodifiableSet(methodNames); |
| } |
| |
| /** |
| * Constructor. |
| * |
| * @param env script environment |
| * @param className name of class to weave |
| * @param superClassName super class name for class |
| * @param interfaceNames names of interfaces implemented by this class, or |
| * {@code null} if none |
| */ |
| ClassEmitter(final Context context, final String className, final String superClassName, final String... interfaceNames) { |
| this(context, new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS)); |
| cw.visit(V1_7, ACC_PUBLIC | ACC_SUPER, className, null, superClassName, interfaceNames); |
| } |
| |
| /** |
| * Constructor from the compiler. |
| * |
| * @param env Script environment |
| * @param sourceName Source name |
| * @param unitClassName Compile unit class name. |
| * @param strictMode Should we generate this method in strict mode |
| */ |
| ClassEmitter(final Context context, final String sourceName, final String unitClassName, final boolean strictMode) { |
| this(context, |
| new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS) { |
| private static final String OBJECT_CLASS = "java/lang/Object"; |
| |
| @Override |
| protected String getCommonSuperClass(final String type1, final String type2) { |
| try { |
| return super.getCommonSuperClass(type1, type2); |
| } catch (final RuntimeException e) { |
| if (isScriptObject(Compiler.SCRIPTS_PACKAGE, type1) && isScriptObject(Compiler.SCRIPTS_PACKAGE, type2)) { |
| return className(ScriptObject.class); |
| } |
| return OBJECT_CLASS; |
| } |
| } |
| }); |
| |
| this.unitClassName = unitClassName; |
| this.constantMethodNeeded = new HashSet<>(); |
| |
| cw.visit(V1_7, ACC_PUBLIC | ACC_SUPER, unitClassName, null, pathName(jdk.nashorn.internal.scripts.JS.class.getName()), null); |
| cw.visitSource(sourceName, null); |
| |
| defineCommonStatics(strictMode); |
| } |
| |
| Context getContext() { |
| return context; |
| } |
| |
| /** |
| * @return the name of the compile unit class name. |
| */ |
| String getUnitClassName() { |
| return unitClassName; |
| } |
| |
| /** |
| * Get the method count, including init and clinit methods. |
| * |
| * @return method count |
| */ |
| public int getMethodCount() { |
| return methodCount; |
| } |
| |
| /** |
| * Get the clinit count. |
| * |
| * @return clinit count |
| */ |
| public int getClinitCount() { |
| return clinitCount; |
| } |
| |
| /** |
| * Get the init count. |
| * |
| * @return init count |
| */ |
| public int getInitCount() { |
| return initCount; |
| } |
| |
| /** |
| * Get the field count. |
| * |
| * @return field count |
| */ |
| public int getFieldCount() { |
| return fieldCount; |
| } |
| |
| /** |
| * Convert a binary name to a package/class name. |
| * |
| * @param name Binary name. |
| * |
| * @return Package/class name. |
| */ |
| private static String pathName(final String name) { |
| return name.replace('.', '/'); |
| } |
| |
| /** |
| * Define the static fields common in all scripts. |
| * |
| * @param strictMode Should we generate this method in strict mode |
| */ |
| private void defineCommonStatics(final boolean strictMode) { |
| // source - used to store the source data (text) for this script. Shared across |
| // compile units. Set externally by the compiler. |
| field(EnumSet.of(Flag.PRIVATE, Flag.STATIC), SOURCE.symbolName(), Source.class); |
| |
| // constants - used to the constants array for this script. Shared across |
| // compile units. Set externally by the compiler. |
| field(EnumSet.of(Flag.PRIVATE, Flag.STATIC), CONSTANTS.symbolName(), Object[].class); |
| |
| // strictMode - was this script compiled in strict mode. Set externally by the compiler. |
| field(EnumSet.of(Flag.PUBLIC, Flag.STATIC, Flag.FINAL), STRICT_MODE.symbolName(), boolean.class, strictMode); |
| } |
| |
| /** |
| * Define static utilities common needed in scripts. These are per compile |
| * unit and therefore have to be defined here and not in code gen. |
| */ |
| private void defineCommonUtilities() { |
| assert unitClassName != null; |
| |
| if (constantMethodNeeded.contains(String.class)) { |
| // $getString - get the ith entry from the constants table and cast to String. |
| final MethodEmitter getStringMethod = method(EnumSet.of(Flag.PRIVATE, Flag.STATIC), GET_STRING.symbolName(), String.class, int.class); |
| getStringMethod.begin(); |
| getStringMethod.getStatic(unitClassName, CONSTANTS.symbolName(), CONSTANTS.descriptor()) |
| .load(Type.INT, 0) |
| .arrayload() |
| .checkcast(String.class) |
| ._return(); |
| getStringMethod.end(); |
| } |
| |
| if (constantMethodNeeded.contains(PropertyMap.class)) { |
| // $getMap - get the ith entry from the constants table and cast to PropertyMap. |
| final MethodEmitter getMapMethod = method(EnumSet.of(Flag.PUBLIC, Flag.STATIC), GET_MAP.symbolName(), PropertyMap.class, int.class); |
| getMapMethod.begin(); |
| getMapMethod.loadConstants() |
| .load(Type.INT, 0) |
| .arrayload() |
| .checkcast(PropertyMap.class) |
| ._return(); |
| getMapMethod.end(); |
| |
| // $setMap - overwrite an existing map. |
| final MethodEmitter setMapMethod = method(EnumSet.of(Flag.PUBLIC, Flag.STATIC), SET_MAP.symbolName(), void.class, int.class, PropertyMap.class); |
| setMapMethod.begin(); |
| setMapMethod.loadConstants() |
| .load(Type.INT, 0) |
| .load(Type.OBJECT, 1) |
| .arraystore(); |
| setMapMethod.returnVoid(); |
| setMapMethod.end(); |
| } |
| |
| // $getXXXX$array - get the ith entry from the constants table and cast to XXXX[]. |
| for (final Class<?> clazz : constantMethodNeeded) { |
| if (clazz.isArray()) { |
| defineGetArrayMethod(clazz); |
| } |
| } |
| } |
| |
| /** |
| * Constructs a primitive specific method for getting the ith entry from the |
| * constants table as an array. |
| * |
| * @param clazz Array class. |
| */ |
| private void defineGetArrayMethod(final Class<?> clazz) { |
| assert unitClassName != null; |
| |
| final String methodName = getArrayMethodName(clazz); |
| final MethodEmitter getArrayMethod = method(EnumSet.of(Flag.PRIVATE, Flag.STATIC), methodName, clazz, int.class); |
| |
| getArrayMethod.begin(); |
| getArrayMethod.getStatic(unitClassName, CONSTANTS.symbolName(), CONSTANTS.descriptor()) |
| .load(Type.INT, 0) |
| .arrayload() |
| .checkcast(clazz) |
| .invoke(virtualCallNoLookup(clazz, "clone", Object.class)) |
| .checkcast(clazz) |
| ._return(); |
| getArrayMethod.end(); |
| } |
| |
| |
| /** |
| * Generate the name of a get array from constant pool method. |
| * |
| * @param clazz Name of array class. |
| * |
| * @return Method name. |
| */ |
| static String getArrayMethodName(final Class<?> clazz) { |
| assert clazz.isArray(); |
| return GET_ARRAY_PREFIX.symbolName() + clazz.getComponentType().getSimpleName() + GET_ARRAY_SUFFIX.symbolName(); |
| } |
| |
| /** |
| * Ensure a get constant method is issued for the class. |
| * |
| * @param clazz Class of constant. |
| */ |
| void needGetConstantMethod(final Class<?> clazz) { |
| constantMethodNeeded.add(clazz); |
| } |
| |
| /** |
| * Inspect class name and decide whether we are generating a ScriptObject class. |
| * |
| * @param scriptPrefix the script class prefix for the current script |
| * @param type the type to check |
| * |
| * @return {@code true} if type is ScriptObject |
| */ |
| private static boolean isScriptObject(final String scriptPrefix, final String type) { |
| if (type.startsWith(scriptPrefix)) { |
| return true; |
| } else if (type.equals(CompilerConstants.className(ScriptObject.class))) { |
| return true; |
| } else if (type.startsWith(Compiler.OBJECTS_PACKAGE)) { |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /** |
| * Call at beginning of class emission. |
| */ |
| public void begin() { |
| classStarted = true; |
| } |
| |
| /** |
| * Call at end of class emission. |
| */ |
| public void end() { |
| assert classStarted : "class not started for " + unitClassName; |
| |
| if (unitClassName != null) { |
| final MethodEmitter initMethod = init(EnumSet.of(Flag.PRIVATE)); |
| initMethod.begin(); |
| initMethod.load(Type.OBJECT, 0); |
| initMethod.newInstance(jdk.nashorn.internal.scripts.JS.class); |
| initMethod.returnVoid(); |
| initMethod.end(); |
| |
| defineCommonUtilities(); |
| } |
| |
| cw.visitEnd(); |
| classStarted = false; |
| classEnded = true; |
| assert methodsStarted.isEmpty() : "methodsStarted not empty " + methodsStarted; |
| } |
| |
| /** |
| * Disassemble an array of byte code. |
| * |
| * @param bytecode byte array representing bytecode |
| * |
| * @return disassembly as human readable string |
| */ |
| static String disassemble(final byte[] bytecode) { |
| final ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| try (final PrintWriter pw = new PrintWriter(baos)) { |
| final NashornClassReader cr = new NashornClassReader(bytecode); |
| final Context ctx = AccessController.doPrivileged(new PrivilegedAction<Context>() { |
| @Override |
| public Context run() { |
| return Context.getContext(); |
| } |
| }); |
| final TraceClassVisitor tcv = new TraceClassVisitor(null, new NashornTextifier(ctx.getEnv(), cr), pw); |
| cr.accept(tcv, 0); |
| } |
| |
| final String str = new String(baos.toByteArray()); |
| return str; |
| } |
| |
| /** |
| * Call back from MethodEmitter for method start. |
| * |
| * @see MethodEmitter |
| * |
| * @param method method emitter. |
| */ |
| void beginMethod(final MethodEmitter method) { |
| assert !methodsStarted.contains(method); |
| methodsStarted.add(method); |
| } |
| |
| /** |
| * Call back from MethodEmitter for method end. |
| * |
| * @see MethodEmitter |
| * |
| * @param method |
| */ |
| void endMethod(final MethodEmitter method) { |
| assert methodsStarted.contains(method); |
| methodsStarted.remove(method); |
| } |
| |
| /** |
| * Add a new method to the class - defaults to public method. |
| * |
| * @param methodName name of method |
| * @param rtype return type of the method |
| * @param ptypes parameter types the method |
| * |
| * @return method emitter to use for weaving this method |
| */ |
| MethodEmitter method(final String methodName, final Class<?> rtype, final Class<?>... ptypes) { |
| return method(DEFAULT_METHOD_FLAGS, methodName, rtype, ptypes); //TODO why public default ? |
| } |
| |
| /** |
| * Add a new method to the class - defaults to public method. |
| * |
| * @param methodFlags access flags for the method |
| * @param methodName name of method |
| * @param rtype return type of the method |
| * @param ptypes parameter types the method |
| * |
| * @return method emitter to use for weaving this method |
| */ |
| MethodEmitter method(final EnumSet<Flag> methodFlags, final String methodName, final Class<?> rtype, final Class<?>... ptypes) { |
| methodCount++; |
| methodNames.add(methodName); |
| return new MethodEmitter(this, methodVisitor(methodFlags, methodName, rtype, ptypes)); |
| } |
| |
| /** |
| * Add a new method to the class - defaults to public method. |
| * |
| * @param methodName name of method |
| * @param descriptor descriptor of method |
| * |
| * @return method emitter to use for weaving this method |
| */ |
| MethodEmitter method(final String methodName, final String descriptor) { |
| return method(DEFAULT_METHOD_FLAGS, methodName, descriptor); |
| } |
| |
| /** |
| * Add a new method to the class - defaults to public method. |
| * |
| * @param methodFlags access flags for the method |
| * @param methodName name of method |
| * @param descriptor descriptor of method |
| * |
| * @return method emitter to use for weaving this method |
| */ |
| MethodEmitter method(final EnumSet<Flag> methodFlags, final String methodName, final String descriptor) { |
| methodCount++; |
| methodNames.add(methodName); |
| return new MethodEmitter(this, cw.visitMethod(Flag.getValue(methodFlags), methodName, descriptor, null, null)); |
| } |
| |
| /** |
| * Add a new method to the class, representing a function node. |
| * |
| * @param functionNode the function node to generate a method for |
| * |
| * @return method emitter to use for weaving this method |
| */ |
| MethodEmitter method(final FunctionNode functionNode) { |
| methodCount++; |
| methodNames.add(functionNode.getName()); |
| final FunctionSignature signature = new FunctionSignature(functionNode); |
| final MethodVisitor mv = cw.visitMethod( |
| ACC_PUBLIC | ACC_STATIC | (functionNode.isVarArg() ? ACC_VARARGS : 0), |
| functionNode.getName(), |
| signature.toString(), |
| null, |
| null); |
| |
| return new MethodEmitter(this, mv, functionNode); |
| } |
| |
| /** |
| * Add a new method to the class, representing a rest-of version of the |
| * function node. |
| * |
| * @param functionNode the function node to generate a method for |
| * |
| * @return method emitter to use for weaving this method |
| */ |
| MethodEmitter restOfMethod(final FunctionNode functionNode) { |
| methodCount++; |
| methodNames.add(functionNode.getName()); |
| final MethodVisitor mv = cw.visitMethod( |
| ACC_PUBLIC | ACC_STATIC, |
| functionNode.getName(), |
| Type.getMethodDescriptor(functionNode.getReturnType().getTypeClass(), RewriteException.class), |
| null, |
| null); |
| |
| return new MethodEmitter(this, mv, functionNode); |
| } |
| |
| |
| /** |
| * Start generating the <clinit> method in the class. |
| * |
| * @return method emitter to use for weaving <clinit> |
| */ |
| MethodEmitter clinit() { |
| clinitCount++; |
| return method(EnumSet.of(Flag.STATIC), CLINIT.symbolName(), void.class); |
| } |
| |
| /** |
| * Start generating an <init>()V method in the class. |
| * |
| * @return method emitter to use for weaving <init>()V |
| */ |
| MethodEmitter init() { |
| initCount++; |
| return method(INIT.symbolName(), void.class); |
| } |
| |
| /** |
| * Start generating an <init>()V method in the class. |
| * |
| * @param ptypes parameter types for constructor |
| * @return method emitter to use for weaving <init>()V |
| */ |
| MethodEmitter init(final Class<?>... ptypes) { |
| initCount++; |
| return method(INIT.symbolName(), void.class, ptypes); |
| } |
| |
| /** |
| * Start generating an <init>(...)V method in the class. |
| * |
| * @param flags access flags for the constructor |
| * @param ptypes parameter types for the constructor |
| * |
| * @return method emitter to use for weaving <init>(...)V |
| */ |
| MethodEmitter init(final EnumSet<Flag> flags, final Class<?>... ptypes) { |
| initCount++; |
| return method(flags, INIT.symbolName(), void.class, ptypes); |
| } |
| |
| /** |
| * Add a field to the class, initialized to a value. |
| * |
| * @param fieldFlags flags, e.g. should it be static or public etc |
| * @param fieldName name of field |
| * @param fieldType the type of the field |
| * @param value the value |
| * |
| * @see ClassEmitter.Flag |
| */ |
| final void field(final EnumSet<Flag> fieldFlags, final String fieldName, final Class<?> fieldType, final Object value) { |
| fieldCount++; |
| cw.visitField(Flag.getValue(fieldFlags), fieldName, typeDescriptor(fieldType), null, value).visitEnd(); |
| } |
| |
| /** |
| * Add a field to the class. |
| * |
| * @param fieldFlags access flags for the field |
| * @param fieldName name of field |
| * @param fieldType type of the field |
| * |
| * @see ClassEmitter.Flag |
| */ |
| final void field(final EnumSet<Flag> fieldFlags, final String fieldName, final Class<?> fieldType) { |
| field(fieldFlags, fieldName, fieldType, null); |
| } |
| |
| /** |
| * Add a field to the class - defaults to public. |
| * |
| * @param fieldName name of field |
| * @param fieldType type of field |
| */ |
| final void field(final String fieldName, final Class<?> fieldType) { |
| field(EnumSet.of(Flag.PUBLIC), fieldName, fieldType, null); |
| } |
| |
| /** |
| * Return a bytecode array from this ClassEmitter. The ClassEmitter must |
| * have been ended (having its end function called) for this to work. |
| * |
| * @return byte code array for generated class, {@code null} if class |
| * generation hasn't been ended with {@link ClassEmitter#end()}. |
| */ |
| byte[] toByteArray() { |
| assert classEnded; |
| if (!classEnded) { |
| return null; |
| } |
| |
| return cw.toByteArray(); |
| } |
| |
| /** |
| * Abstraction for flags used in class emission. We provide abstraction |
| * separating these from the underlying bytecode emitter. Flags are provided |
| * for method handles, protection levels, static/virtual fields/methods. |
| */ |
| static enum Flag { |
| /** method handle with static access */ |
| HANDLE_STATIC(H_INVOKESTATIC), |
| /** method handle with new invoke special access */ |
| HANDLE_NEWSPECIAL(H_NEWINVOKESPECIAL), |
| /** method handle with invoke special access */ |
| HANDLE_SPECIAL(H_INVOKESPECIAL), |
| /** method handle with invoke virtual access */ |
| HANDLE_VIRTUAL(H_INVOKEVIRTUAL), |
| /** method handle with invoke interface access */ |
| HANDLE_INTERFACE(H_INVOKEINTERFACE), |
| |
| /** final access */ |
| FINAL(ACC_FINAL), |
| /** static access */ |
| STATIC(ACC_STATIC), |
| /** public access */ |
| PUBLIC(ACC_PUBLIC), |
| /** private access */ |
| PRIVATE(ACC_PRIVATE); |
| |
| private int value; |
| |
| private Flag(final int value) { |
| this.value = value; |
| } |
| |
| /** |
| * Get the value of this flag |
| * @return the int value |
| */ |
| int getValue() { |
| return value; |
| } |
| |
| /** |
| * Return the corresponding ASM flag value for an enum set of flags. |
| * |
| * @param flags enum set of flags |
| * |
| * @return an integer value representing the flags intrinsic values |
| * or:ed together |
| */ |
| static int getValue(final EnumSet<Flag> flags) { |
| int v = 0; |
| for (final Flag flag : flags) { |
| v |= flag.getValue(); |
| } |
| return v; |
| } |
| } |
| |
| private MethodVisitor methodVisitor(final EnumSet<Flag> flags, final String methodName, final Class<?> rtype, final Class<?>... ptypes) { |
| return cw.visitMethod(Flag.getValue(flags), methodName, methodDescriptor(rtype, ptypes), null, null); |
| } |
| |
| } |
