1 /*
2 * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package java.lang.invoke;
27
28 import jdk.internal.org.objectweb.asm.MethodVisitor;
29 import jdk.internal.org.objectweb.asm.Opcodes;
30 import jdk.internal.org.objectweb.asm.Type;
31 import sun.invoke.util.BytecodeDescriptor;
32 import sun.invoke.util.Wrapper;
33 import static sun.invoke.util.Wrapper.*;
34
35 class TypeConvertingMethodAdapter extends MethodVisitor {
36
37 TypeConvertingMethodAdapter(MethodVisitor mv) {
38 super(Opcodes.ASM5, mv);
39 }
40
41 private static final int NUM_WRAPPERS = Wrapper.COUNT;
42
43 private static final String NAME_OBJECT = "java/lang/Object";
44 private static final String WRAPPER_PREFIX = "Ljava/lang/";
45
46 // Same for all primitives; name of the boxing method
47 private static final String NAME_BOX_METHOD = "valueOf";
48
49 // Table of opcodes for widening primitive conversions; NOP = no conversion
50 private static final int[][] wideningOpcodes = new int[NUM_WRAPPERS][NUM_WRAPPERS];
51
52 private static final Wrapper[] FROM_WRAPPER_NAME = new Wrapper[16];
53
54 // Table of wrappers for primitives, indexed by ASM type sorts
55 private static final Wrapper[] FROM_TYPE_SORT = new Wrapper[12];
56
57 static {
58 for (Wrapper w : Wrapper.values()) {
59 if (w.basicTypeChar() != 'L') {
60 int wi = hashWrapperName(w.wrapperSimpleName());
61 assert (FROM_WRAPPER_NAME[wi] == null);
62 FROM_WRAPPER_NAME[wi] = w;
63 }
64 }
65
66 // wideningOpcodes[][] will be NOP-initialized by default
67 assert(Opcodes.NOP == 0);
68
69 initWidening(LONG, Opcodes.I2L, BYTE, SHORT, INT, CHAR);
70 initWidening(LONG, Opcodes.F2L, FLOAT);
71 initWidening(FLOAT, Opcodes.I2F, BYTE, SHORT, INT, CHAR);
72 initWidening(FLOAT, Opcodes.L2F, LONG);
73 initWidening(DOUBLE, Opcodes.I2D, BYTE, SHORT, INT, CHAR);
74 initWidening(DOUBLE, Opcodes.F2D, FLOAT);
75 initWidening(DOUBLE, Opcodes.L2D, LONG);
76
77 FROM_TYPE_SORT[Type.BYTE] = Wrapper.BYTE;
78 FROM_TYPE_SORT[Type.SHORT] = Wrapper.SHORT;
79 FROM_TYPE_SORT[Type.INT] = Wrapper.INT;
80 FROM_TYPE_SORT[Type.LONG] = Wrapper.LONG;
81 FROM_TYPE_SORT[Type.CHAR] = Wrapper.CHAR;
82 FROM_TYPE_SORT[Type.FLOAT] = Wrapper.FLOAT;
83 FROM_TYPE_SORT[Type.DOUBLE] = Wrapper.DOUBLE;
84 FROM_TYPE_SORT[Type.BOOLEAN] = Wrapper.BOOLEAN;
85 }
86
87 private static void initWidening(Wrapper to, int opcode, Wrapper... from) {
88 for (Wrapper f : from) {
89 wideningOpcodes[f.ordinal()][to.ordinal()] = opcode;
90 }
91 }
92
93 /**
94 * Class name to Wrapper hash, derived from Wrapper.hashWrap()
95 * @param xn
96 * @return The hash code 0-15
97 */
98 private static int hashWrapperName(String xn) {
99 if (xn.length() < 3) {
100 return 0;
101 }
102 return (3 * xn.charAt(1) + xn.charAt(2)) % 16;
103 }
104
105 private Wrapper wrapperOrNullFromDescriptor(String desc) {
106 if (!desc.startsWith(WRAPPER_PREFIX)) {
107 // Not a class type (array or method), so not a boxed type
108 // or not in the right package
109 return null;
110 }
111 // Pare it down to the simple class name
112 String cname = desc.substring(WRAPPER_PREFIX.length(), desc.length() - 1);
113 // Hash to a Wrapper
114 Wrapper w = FROM_WRAPPER_NAME[hashWrapperName(cname)];
115 if (w == null || w.wrapperSimpleName().equals(cname)) {
116 return w;
117 } else {
118 return null;
119 }
120 }
121
122 private static String wrapperName(Wrapper w) {
123 return "java/lang/" + w.wrapperSimpleName();
124 }
125
126 private static String unboxMethod(Wrapper w) {
127 return w.primitiveSimpleName() + "Value";
128 }
129
130 private static String boxingDescriptor(Wrapper w) {
131 return "(" + w.basicTypeChar() + ")L" + wrapperName(w) + ";";
132 }
133
134 private static String unboxingDescriptor(Wrapper w) {
135 return "()" + w.basicTypeChar();
136 }
137
138 void boxIfTypePrimitive(Type t) {
139 Wrapper w = FROM_TYPE_SORT[t.getSort()];
140 if (w != null) {
141 box(w);
142 }
143 }
144
145 void widen(Wrapper ws, Wrapper wt) {
146 if (ws != wt) {
147 int opcode = wideningOpcodes[ws.ordinal()][wt.ordinal()];
148 if (opcode != Opcodes.NOP) {
149 visitInsn(opcode);
150 }
151 }
152 }
153
154 void box(Wrapper w) {
155 visitMethodInsn(Opcodes.INVOKESTATIC,
156 wrapperName(w),
157 NAME_BOX_METHOD,
158 boxingDescriptor(w), false);
159 }
160
161 /**
162 * Convert types by unboxing. The source type is known to be a primitive wrapper.
163 * @param sname A primitive wrapper corresponding to wrapped reference source type
164 * @param wt A primitive wrapper being converted to
165 */
166 void unbox(String sname, Wrapper wt) {
167 visitMethodInsn(Opcodes.INVOKEVIRTUAL,
168 sname,
169 unboxMethod(wt),
170 unboxingDescriptor(wt), false);
171 }
172
173 private String descriptorToName(String desc) {
174 int last = desc.length() - 1;
175 if (desc.charAt(0) == 'L' && desc.charAt(last) == ';') {
176 // In descriptor form
177 return desc.substring(1, last);
178 } else {
179 // Already in internal name form
180 return desc;
181 }
182 }
183
184 void cast(String ds, String dt) {
185 String ns = descriptorToName(ds);
186 String nt = descriptorToName(dt);
187 if (!nt.equals(ns) && !nt.equals(NAME_OBJECT)) {
188 visitTypeInsn(Opcodes.CHECKCAST, nt);
189 }
190 }
191
192 private Wrapper toWrapper(String desc) {
193 char first = desc.charAt(0);
194 if (first == '[' || first == '(') {
195 first = 'L';
196 }
197 return Wrapper.forBasicType(first);
198 }
199
200 /**
201 * Convert an argument of type 'arg' to be passed to 'target' assuring that it is 'functional'.
202 * Insert the needed conversion instructions in the method code.
203 * @param arg
204 * @param target
205 * @param functional
206 */
207 void convertType(Class<?> arg, Class<?> target, Class<?> functional) {
208 if (arg.equals(target) && arg.equals(functional)) {
209 return;
210 }
211 if (arg == Void.TYPE || target == Void.TYPE) {
212 return;
213 }
214 if (arg.isPrimitive()) {
215 Wrapper wArg = Wrapper.forPrimitiveType(arg);
216 if (target.isPrimitive()) {
217 // Both primitives: widening
218 widen(wArg, Wrapper.forPrimitiveType(target));
219 } else {
220 // Primitive argument to reference target
221 String dTarget = BytecodeDescriptor.unparse(target);
222 Wrapper wPrimTarget = wrapperOrNullFromDescriptor(dTarget);
223 if (wPrimTarget != null) {
224 // The target is a boxed primitive type, widen to get there before boxing
225 widen(wArg, wPrimTarget);
226 box(wPrimTarget);
227 } else {
228 // Otherwise, box and cast
229 box(wArg);
230 cast(wrapperName(wArg), dTarget);
231 }
232 }
233 } else {
234 String dArg = BytecodeDescriptor.unparse(arg);
235 String dSrc;
236 if (functional.isPrimitive()) {
237 dSrc = dArg;
238 } else {
239 // Cast to convert to possibly more specific type, and generate CCE for invalid arg
240 dSrc = BytecodeDescriptor.unparse(functional);
241 cast(dArg, dSrc);
242 }
243 String dTarget = BytecodeDescriptor.unparse(target);
244 if (target.isPrimitive()) {
245 Wrapper wTarget = toWrapper(dTarget);
246 // Reference argument to primitive target
247 Wrapper wps = wrapperOrNullFromDescriptor(dSrc);
248 if (wps != null) {
249 if (wps.isSigned() || wps.isFloating()) {
250 // Boxed number to primitive
251 unbox(wrapperName(wps), wTarget);
252 } else {
253 // Character or Boolean
254 unbox(wrapperName(wps), wps);
255 widen(wps, wTarget);
256 }
257 } else {
258 // Source type is reference type, but not boxed type,
259 // assume it is super type of target type
260 String intermediate;
261 if (wTarget.isSigned() || wTarget.isFloating()) {
262 // Boxed number to primitive
263 intermediate = "java/lang/Number";
264 } else {
265 // Character or Boolean
266 intermediate = wrapperName(wTarget);
267 }
268 cast(dSrc, intermediate);
269 unbox(intermediate, wTarget);
270 }
271 } else {
272 // Both reference types: just case to target type
273 cast(dSrc, dTarget);
274 }
275 }
276 }
277
278 /**
279 * The following method is copied from
280 * org.objectweb.asm.commons.InstructionAdapter. Part of ASM: a very small
281 * and fast Java bytecode manipulation framework.
282 * Copyright (c) 2000-2005 INRIA, France Telecom All rights reserved.
283 */
284 void iconst(final int cst) {
285 if (cst >= -1 && cst <= 5) {
286 mv.visitInsn(Opcodes.ICONST_0 + cst);
287 } else if (cst >= Byte.MIN_VALUE && cst <= Byte.MAX_VALUE) {
288 mv.visitIntInsn(Opcodes.BIPUSH, cst);
289 } else if (cst >= Short.MIN_VALUE && cst <= Short.MAX_VALUE) {
290 mv.visitIntInsn(Opcodes.SIPUSH, cst);
291 } else {
292 mv.visitLdcInsn(cst);
293 }
294 }
295 }