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/*
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* Copyright (c) 2012, 2013, 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. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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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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package java.lang.invoke;
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import jdk.internal.org.objectweb.asm.MethodVisitor;
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import jdk.internal.org.objectweb.asm.Opcodes;
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import jdk.internal.org.objectweb.asm.Type;
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import sun.invoke.util.BytecodeDescriptor;
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import sun.invoke.util.Wrapper;
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import static sun.invoke.util.Wrapper.*;
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class TypeConvertingMethodAdapter extends MethodVisitor {
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TypeConvertingMethodAdapter(MethodVisitor mv) {
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super(Opcodes.ASM5, mv);
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}
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private static final int NUM_WRAPPERS = Wrapper.values().length;
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private static final String NAME_OBJECT = "java/lang/Object";
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private static final String WRAPPER_PREFIX = "Ljava/lang/";
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// Same for all primitives; name of the boxing method
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private static final String NAME_BOX_METHOD = "valueOf";
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// Table of opcodes for widening primitive conversions; NOP = no conversion
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private static final int[][] wideningOpcodes = new int[NUM_WRAPPERS][NUM_WRAPPERS];
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private static final Wrapper[] FROM_WRAPPER_NAME = new Wrapper[16];
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// Table of wrappers for primitives, indexed by ASM type sorts
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private static final Wrapper[] FROM_TYPE_SORT = new Wrapper[16];
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static {
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for (Wrapper w : Wrapper.values()) {
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if (w.basicTypeChar() != 'L') {
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int wi = hashWrapperName(w.wrapperSimpleName());
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assert (FROM_WRAPPER_NAME[wi] == null);
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FROM_WRAPPER_NAME[wi] = w;
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}
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}
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for (int i = 0; i < NUM_WRAPPERS; i++) {
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for (int j = 0; j < NUM_WRAPPERS; j++) {
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wideningOpcodes[i][j] = Opcodes.NOP;
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}
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}
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initWidening(LONG, Opcodes.I2L, BYTE, SHORT, INT, CHAR);
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initWidening(LONG, Opcodes.F2L, FLOAT);
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initWidening(FLOAT, Opcodes.I2F, BYTE, SHORT, INT, CHAR);
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initWidening(FLOAT, Opcodes.L2F, LONG);
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initWidening(DOUBLE, Opcodes.I2D, BYTE, SHORT, INT, CHAR);
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initWidening(DOUBLE, Opcodes.F2D, FLOAT);
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initWidening(DOUBLE, Opcodes.L2D, LONG);
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FROM_TYPE_SORT[Type.BYTE] = Wrapper.BYTE;
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FROM_TYPE_SORT[Type.SHORT] = Wrapper.SHORT;
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FROM_TYPE_SORT[Type.INT] = Wrapper.INT;
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FROM_TYPE_SORT[Type.LONG] = Wrapper.LONG;
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FROM_TYPE_SORT[Type.CHAR] = Wrapper.CHAR;
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FROM_TYPE_SORT[Type.FLOAT] = Wrapper.FLOAT;
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FROM_TYPE_SORT[Type.DOUBLE] = Wrapper.DOUBLE;
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FROM_TYPE_SORT[Type.BOOLEAN] = Wrapper.BOOLEAN;
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}
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private static void initWidening(Wrapper to, int opcode, Wrapper... from) {
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for (Wrapper f : from) {
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wideningOpcodes[f.ordinal()][to.ordinal()] = opcode;
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}
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}
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/**
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* Class name to Wrapper hash, derived from Wrapper.hashWrap()
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* @param xn
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* @return The hash code 0-15
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*/
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private static int hashWrapperName(String xn) {
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if (xn.length() < 3) {
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return 0;
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}
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return (3 * xn.charAt(1) + xn.charAt(2)) % 16;
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}
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private Wrapper wrapperOrNullFromDescriptor(String desc) {
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if (!desc.startsWith(WRAPPER_PREFIX)) {
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// Not a class type (array or method), so not a boxed type
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// or not in the right package
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return null;
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}
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// Pare it down to the simple class name
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String cname = desc.substring(WRAPPER_PREFIX.length(), desc.length() - 1);
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// Hash to a Wrapper
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Wrapper w = FROM_WRAPPER_NAME[hashWrapperName(cname)];
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if (w == null || w.wrapperSimpleName().equals(cname)) {
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return w;
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} else {
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return null;
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}
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}
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private static String wrapperName(Wrapper w) {
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return "java/lang/" + w.wrapperSimpleName();
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}
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private static String unboxMethod(Wrapper w) {
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return w.primitiveSimpleName() + "Value";
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}
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private static String boxingDescriptor(Wrapper w) {
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return String.format("(%s)L%s;", w.basicTypeChar(), wrapperName(w));
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}
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private static String unboxingDescriptor(Wrapper w) {
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return "()" + w.basicTypeChar();
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}
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void boxIfTypePrimitive(Type t) {
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Wrapper w = FROM_TYPE_SORT[t.getSort()];
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if (w != null) {
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box(w);
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}
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}
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void widen(Wrapper ws, Wrapper wt) {
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if (ws != wt) {
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int opcode = wideningOpcodes[ws.ordinal()][wt.ordinal()];
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if (opcode != Opcodes.NOP) {
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visitInsn(opcode);
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}
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}
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}
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void box(Wrapper w) {
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visitMethodInsn(Opcodes.INVOKESTATIC,
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wrapperName(w),
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NAME_BOX_METHOD,
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boxingDescriptor(w));
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}
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/**
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* Convert types by unboxing. The source type is known to be a primitive wrapper.
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* @param ws A primitive wrapper corresponding to wrapped reference source type
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* @param wt A primitive wrapper being converted to
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*/
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void unbox(String sname, Wrapper wt) {
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visitMethodInsn(Opcodes.INVOKEVIRTUAL,
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sname,
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unboxMethod(wt),
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unboxingDescriptor(wt));
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}
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private String descriptorToName(String desc) {
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int last = desc.length() - 1;
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if (desc.charAt(0) == 'L' && desc.charAt(last) == ';') {
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// In descriptor form
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return desc.substring(1, last);
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} else {
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// Already in internal name form
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return desc;
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}
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}
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void cast(String ds, String dt) {
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String ns = descriptorToName(ds);
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String nt = descriptorToName(dt);
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if (!nt.equals(ns) && !nt.equals(NAME_OBJECT)) {
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visitTypeInsn(Opcodes.CHECKCAST, nt);
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}
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}
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private boolean isPrimitive(Wrapper w) {
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return w != OBJECT;
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}
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private Wrapper toWrapper(String desc) {
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char first = desc.charAt(0);
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if (first == '[' || first == '(') {
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first = 'L';
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}
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return Wrapper.forBasicType(first);
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}
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/**
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* Convert an argument of type 'arg' to be passed to 'target' assuring that it is 'functional'.
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* Insert the needed conversion instructions in the method code.
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* @param arg
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* @param target
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* @param functional
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*/
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void convertType(Class<?> arg, Class<?> target, Class<?> functional) {
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if (arg.equals(target) && arg.equals(functional)) {
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return;
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}
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if (arg == Void.TYPE || target == Void.TYPE) {
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return;
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}
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if (arg.isPrimitive()) {
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Wrapper wArg = Wrapper.forPrimitiveType(arg);
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if (target.isPrimitive()) {
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// Both primitives: widening
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widen(wArg, Wrapper.forPrimitiveType(target));
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} else {
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// Primitive argument to reference target
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String dTarget = BytecodeDescriptor.unparse(target);
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Wrapper wPrimTarget = wrapperOrNullFromDescriptor(dTarget);
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if (wPrimTarget != null) {
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// The target is a boxed primitive type, widen to get there before boxing
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widen(wArg, wPrimTarget);
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box(wPrimTarget);
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} else {
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// Otherwise, box and cast
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box(wArg);
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cast(wrapperName(wArg), dTarget);
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}
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}
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} else {
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String dArg = BytecodeDescriptor.unparse(arg);
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String dSrc;
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if (functional.isPrimitive()) {
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dSrc = dArg;
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} else {
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// Cast to convert to possibly more specific type, and generate CCE for invalid arg
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dSrc = BytecodeDescriptor.unparse(functional);
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cast(dArg, dSrc);
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}
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String dTarget = BytecodeDescriptor.unparse(target);
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if (target.isPrimitive()) {
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Wrapper wTarget = toWrapper(dTarget);
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// Reference argument to primitive target
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Wrapper wps = wrapperOrNullFromDescriptor(dSrc);
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if (wps != null) {
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if (wps.isSigned() || wps.isFloating()) {
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// Boxed number to primitive
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unbox(wrapperName(wps), wTarget);
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} else {
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// Character or Boolean
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unbox(wrapperName(wps), wps);
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widen(wps, wTarget);
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}
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} else {
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// Source type is reference type, but not boxed type,
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// assume it is super type of target type
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String intermediate;
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if (wTarget.isSigned() || wTarget.isFloating()) {
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// Boxed number to primitive
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intermediate = "java/lang/Number";
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} else {
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// Character or Boolean
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intermediate = wrapperName(wTarget);
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}
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cast(dSrc, intermediate);
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unbox(intermediate, wTarget);
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}
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} else {
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// Both reference types: just case to target type
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cast(dSrc, dTarget);
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}
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}
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}
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jaroslav@1646
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/**
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jaroslav@1646
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* The following method is copied from
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jaroslav@1646
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* org.objectweb.asm.commons.InstructionAdapter. Part of ASM: a very small
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* and fast Java bytecode manipulation framework.
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jaroslav@1646
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* Copyright (c) 2000-2005 INRIA, France Telecom All rights reserved.
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*/
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jaroslav@1646
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void iconst(final int cst) {
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jaroslav@1646
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if (cst >= -1 && cst <= 5) {
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jaroslav@1646
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mv.visitInsn(Opcodes.ICONST_0 + cst);
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} else if (cst >= Byte.MIN_VALUE && cst <= Byte.MAX_VALUE) {
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jaroslav@1646
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mv.visitIntInsn(Opcodes.BIPUSH, cst);
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jaroslav@1646
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} else if (cst >= Short.MIN_VALUE && cst <= Short.MAX_VALUE) {
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jaroslav@1646
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mv.visitIntInsn(Opcodes.SIPUSH, cst);
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} else {
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|
299 |
mv.visitLdcInsn(cst);
|
jaroslav@1646
|
300 |
}
|
jaroslav@1646
|
301 |
}
|
jaroslav@1646
|
302 |
}
|