1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java Mon Sep 24 11:07:38 2012 +0200
1.3 @@ -0,0 +1,793 @@
1.4 +/*
1.5 +Java 4 Browser Bytecode Translator
1.6 +Copyright (C) 2012-2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
1.7 +
1.8 +This program is free software: you can redistribute it and/or modify
1.9 +it under the terms of the GNU General Public License as published by
1.10 +the Free Software Foundation, version 2 of the License.
1.11 +
1.12 +This program is distributed in the hope that it will be useful,
1.13 +but WITHOUT ANY WARRANTY; without even the implied warranty of
1.14 +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1.15 +GNU General Public License for more details.
1.16 +
1.17 +You should have received a copy of the GNU General Public License
1.18 +along with this program. Look for COPYING file in the top folder.
1.19 +If not, see http://opensource.org/licenses/GPL-2.0.
1.20 +*/
1.21 +package org.apidesign.vm4brwsr;
1.22 +
1.23 +import java.io.IOException;
1.24 +import java.io.InputStream;
1.25 +import java.util.ArrayList;
1.26 +import java.util.Collection;
1.27 +import java.util.List;
1.28 +import static org.netbeans.modules.classfile.ByteCodes.*;
1.29 +import org.netbeans.modules.classfile.CPClassInfo;
1.30 +import org.netbeans.modules.classfile.CPEntry;
1.31 +import org.netbeans.modules.classfile.CPFieldInfo;
1.32 +import org.netbeans.modules.classfile.CPMethodInfo;
1.33 +import org.netbeans.modules.classfile.CPStringInfo;
1.34 +import org.netbeans.modules.classfile.ClassFile;
1.35 +import org.netbeans.modules.classfile.ClassName;
1.36 +import org.netbeans.modules.classfile.Code;
1.37 +import org.netbeans.modules.classfile.Method;
1.38 +import org.netbeans.modules.classfile.Parameter;
1.39 +import org.netbeans.modules.classfile.Variable;
1.40 +
1.41 +/** Translator of the code inside class files to JavaScript.
1.42 + *
1.43 + * @author Jaroslav Tulach <jtulach@netbeans.org>
1.44 + */
1.45 +public final class ByteCodeToJavaScript {
1.46 + private final ClassFile jc;
1.47 + private final Appendable out;
1.48 + private final Collection<? super String> references;
1.49 +
1.50 + private ByteCodeToJavaScript(
1.51 + ClassFile jc, Appendable out, Collection<? super String> references
1.52 + ) {
1.53 + this.jc = jc;
1.54 + this.out = out;
1.55 + this.references = references;
1.56 + }
1.57 +
1.58 + /**
1.59 + * Converts a given class file to a JavaScript version.
1.60 + *
1.61 + * @param classFile input stream with code of the .class file
1.62 + * @param out a {@link StringBuilder} or similar to generate the output to
1.63 + * @param references a write only collection where the system adds list of
1.64 + * other classes that were referenced and should be loaded in order the
1.65 + * generated JavaScript code works properly. The names are in internal
1.66 + * JVM form so String is <code>java/lang/String</code>. Can be <code>null</code>
1.67 + * if one is not interested in knowing references
1.68 + * @throws IOException if something goes wrong during read or write or translating
1.69 + */
1.70 +
1.71 + public static void compile(
1.72 + InputStream classFile, Appendable out,
1.73 + Collection<? super String> references
1.74 + ) throws IOException {
1.75 + ClassFile jc = new ClassFile(classFile, true);
1.76 + ByteCodeToJavaScript compiler = new ByteCodeToJavaScript(
1.77 + jc, out, references
1.78 + );
1.79 + List<String> toInitilize = new ArrayList<String>();
1.80 + for (Method m : jc.getMethods()) {
1.81 + if (m.isStatic()) {
1.82 + compiler.generateStaticMethod(m, toInitilize);
1.83 + } else {
1.84 + compiler.generateInstanceMethod(m);
1.85 + }
1.86 + }
1.87 + for (Variable v : jc.getVariables()) {
1.88 + if (v.isStatic()) {
1.89 + compiler.generateStaticField(v);
1.90 + }
1.91 + }
1.92 +
1.93 + final String className = jc.getName().getInternalName().replace('/', '_');
1.94 + out.append("\nfunction ").append(className);
1.95 + out.append("() {");
1.96 + for (Method m : jc.getMethods()) {
1.97 + if (!m.isStatic()) {
1.98 + compiler.generateMethodReference(m);
1.99 + }
1.100 + }
1.101 + for (Variable v : jc.getVariables()) {
1.102 + if (!v.isStatic()) {
1.103 + out.append("\n this." + v.getName() + " = 0;");
1.104 + }
1.105 + }
1.106 + out.append("\n this.$instOf_").append(className).append(" = true;");
1.107 + out.append("\n}");
1.108 + ClassName sc = jc.getSuperClass();
1.109 + if (sc != null) {
1.110 + out.append("\n").append(className)
1.111 + .append(".prototype = new ").append(sc.getInternalName().replace('/', '_'));
1.112 + }
1.113 + for (String init : toInitilize) {
1.114 + out.append("\n").append(init).append("();");
1.115 + }
1.116 + }
1.117 + private void generateStaticMethod(Method m, List<String> toInitilize) throws IOException {
1.118 + final String mn = findMethodName(m);
1.119 + out.append("\nfunction ").append(
1.120 + jc.getName().getInternalName().replace('/', '_')
1.121 + ).append('_').append(mn);
1.122 + if (mn.equals("classV")) {
1.123 + toInitilize.add(jc.getName().getInternalName().replace('/', '_') + '_' + mn);
1.124 + }
1.125 + out.append('(');
1.126 + String space = "";
1.127 + List<Parameter> args = m.getParameters();
1.128 + for (int index = 0, i = 0; i < args.size(); i++) {
1.129 + out.append(space);
1.130 + out.append("arg").append(String.valueOf(index));
1.131 + space = ",";
1.132 + final String desc = args.get(i).getDescriptor();
1.133 + if ("D".equals(desc) || "J".equals(desc)) {
1.134 + index += 2;
1.135 + } else {
1.136 + index++;
1.137 + }
1.138 + }
1.139 + out.append(") {").append("\n");
1.140 + final Code code = m.getCode();
1.141 + if (code != null) {
1.142 + int len = code.getMaxLocals();
1.143 + for (int index = args.size(), i = args.size(); i < len; i++) {
1.144 + out.append(" var ");
1.145 + out.append("arg").append(String.valueOf(i)).append(";\n");
1.146 + }
1.147 + out.append(" var stack = new Array();\n");
1.148 + produceCode(code.getByteCodes());
1.149 + } else {
1.150 + out.append(" /* no code found for ").append(m.getTypeSignature()).append(" */\n");
1.151 + }
1.152 + out.append("}");
1.153 + }
1.154 +
1.155 + private void generateMethodReference(Method m) throws IOException {
1.156 + final String name = findMethodName(m);
1.157 + out.append("\n this.").append(name).append(" = ")
1.158 + .append(jc.getName().getInternalName().replace('/', '_'))
1.159 + .append('_').append(name).append(";");
1.160 + }
1.161 +
1.162 + private void generateInstanceMethod(Method m) throws IOException {
1.163 + out.append("\nfunction ").append(
1.164 + jc.getName().getInternalName().replace('/', '_')
1.165 + ).append('_').append(findMethodName(m));
1.166 + out.append("(arg0");
1.167 + String space = ",";
1.168 + List<Parameter> args = m.getParameters();
1.169 + for (int index = 1, i = 0; i < args.size(); i++) {
1.170 + out.append(space);
1.171 + out.append("arg").append(String.valueOf(index));
1.172 + final String desc = args.get(i).getDescriptor();
1.173 + if ("D".equals(desc) || "J".equals(desc)) {
1.174 + index += 2;
1.175 + } else {
1.176 + index++;
1.177 + }
1.178 + }
1.179 + out.append(") {").append("\n");
1.180 + final Code code = m.getCode();
1.181 + if (code != null) {
1.182 + int len = code.getMaxLocals();
1.183 + for (int index = args.size(), i = args.size(); i < len; i++) {
1.184 + out.append(" var ");
1.185 + out.append("arg").append(String.valueOf(i + 1)).append(";\n");
1.186 + }
1.187 + out.append(";\n var stack = new Array(");
1.188 + out.append(Integer.toString(code.getMaxStack()));
1.189 + out.append(");\n");
1.190 + produceCode(code.getByteCodes());
1.191 + } else {
1.192 + out.append(" /* no code found for ").append(m.getTypeSignature()).append(" */\n");
1.193 + }
1.194 + out.append("}");
1.195 + }
1.196 +
1.197 + private void produceCode(byte[] byteCodes) throws IOException {
1.198 + out.append("\n var gt = 0;\n for(;;) switch(gt) {\n");
1.199 + for (int i = 0; i < byteCodes.length; i++) {
1.200 + int prev = i;
1.201 + out.append(" case " + i).append(": ");
1.202 + final int c = (byteCodes[i] + 256) % 256;
1.203 + switch (c) {
1.204 + case bc_aload_0:
1.205 + case bc_iload_0:
1.206 + case bc_lload_0:
1.207 + case bc_fload_0:
1.208 + case bc_dload_0:
1.209 + out.append("stack.push(arg0);");
1.210 + break;
1.211 + case bc_aload_1:
1.212 + case bc_iload_1:
1.213 + case bc_lload_1:
1.214 + case bc_fload_1:
1.215 + case bc_dload_1:
1.216 + out.append("stack.push(arg1);");
1.217 + break;
1.218 + case bc_aload_2:
1.219 + case bc_iload_2:
1.220 + case bc_lload_2:
1.221 + case bc_fload_2:
1.222 + case bc_dload_2:
1.223 + out.append("stack.push(arg2);");
1.224 + break;
1.225 + case bc_aload_3:
1.226 + case bc_iload_3:
1.227 + case bc_lload_3:
1.228 + case bc_fload_3:
1.229 + case bc_dload_3:
1.230 + out.append("stack.push(arg3);");
1.231 + break;
1.232 + case bc_iload:
1.233 + case bc_lload:
1.234 + case bc_fload:
1.235 + case bc_dload:
1.236 + case bc_aload: {
1.237 + final int indx = (byteCodes[++i] + 256) % 256;
1.238 + out.append("stack.push(arg").append(indx + ");");
1.239 + break;
1.240 + }
1.241 + case bc_astore_0:
1.242 + case bc_istore_0:
1.243 + case bc_lstore_0:
1.244 + case bc_fstore_0:
1.245 + case bc_dstore_0:
1.246 + out.append("arg0 = stack.pop();");
1.247 + break;
1.248 + case bc_astore_1:
1.249 + case bc_istore_1:
1.250 + case bc_lstore_1:
1.251 + case bc_fstore_1:
1.252 + case bc_dstore_1:
1.253 + out.append("arg1 = stack.pop();");
1.254 + break;
1.255 + case bc_astore_2:
1.256 + case bc_istore_2:
1.257 + case bc_lstore_2:
1.258 + case bc_fstore_2:
1.259 + case bc_dstore_2:
1.260 + out.append("arg2 = stack.pop();");
1.261 + break;
1.262 + case bc_astore_3:
1.263 + case bc_istore_3:
1.264 + case bc_lstore_3:
1.265 + case bc_fstore_3:
1.266 + case bc_dstore_3:
1.267 + out.append("arg3 = stack.pop();");
1.268 + break;
1.269 + case bc_iadd:
1.270 + case bc_ladd:
1.271 + case bc_fadd:
1.272 + case bc_dadd:
1.273 + out.append("stack.push(stack.pop() + stack.pop());");
1.274 + break;
1.275 + case bc_isub:
1.276 + case bc_lsub:
1.277 + case bc_fsub:
1.278 + case bc_dsub:
1.279 + out.append("{ var tmp = stack.pop(); stack.push(stack.pop() - tmp); }");
1.280 + break;
1.281 + case bc_imul:
1.282 + case bc_lmul:
1.283 + case bc_fmul:
1.284 + case bc_dmul:
1.285 + out.append("stack.push(stack.pop() * stack.pop());");
1.286 + break;
1.287 + case bc_idiv:
1.288 + case bc_ldiv:
1.289 + out.append("{ var tmp = stack.pop(); stack.push(Math.floor(stack.pop() / tmp)); }");
1.290 + break;
1.291 + case bc_fdiv:
1.292 + case bc_ddiv:
1.293 + out.append("{ var tmp = stack.pop(); stack.push(stack.pop() / tmp); }");
1.294 + break;
1.295 + case bc_iand:
1.296 + case bc_land:
1.297 + out.append("stack.push(stack.pop() & stack.pop());");
1.298 + break;
1.299 + case bc_ior:
1.300 + case bc_lor:
1.301 + out.append("stack.push(stack.pop() | stack.pop());");
1.302 + break;
1.303 + case bc_ixor:
1.304 + case bc_lxor:
1.305 + out.append("stack.push(stack.pop() ^ stack.pop());");
1.306 + break;
1.307 + case bc_iinc: {
1.308 + final int varIndx = (byteCodes[++i] + 256) % 256;
1.309 + final int incrBy = (byteCodes[++i] + 256) % 256;
1.310 + if (incrBy == 1) {
1.311 + out.append("arg" + varIndx).append("++;");
1.312 + } else {
1.313 + out.append("arg" + varIndx).append(" += " + incrBy).append(";");
1.314 + }
1.315 + break;
1.316 + }
1.317 + case bc_return:
1.318 + out.append("return;");
1.319 + break;
1.320 + case bc_ireturn:
1.321 + case bc_lreturn:
1.322 + case bc_freturn:
1.323 + case bc_dreturn:
1.324 + case bc_areturn:
1.325 + out.append("return stack.pop();");
1.326 + break;
1.327 + case bc_i2l:
1.328 + case bc_i2f:
1.329 + case bc_i2d:
1.330 + case bc_l2i:
1.331 + // max int check?
1.332 + case bc_l2f:
1.333 + case bc_l2d:
1.334 + case bc_f2d:
1.335 + case bc_d2f:
1.336 + out.append("/* number conversion */");
1.337 + break;
1.338 + case bc_f2i:
1.339 + case bc_f2l:
1.340 + case bc_d2i:
1.341 + case bc_d2l:
1.342 + out.append("stack.push(Math.floor(stack.pop()));");
1.343 + break;
1.344 + case bc_i2b:
1.345 + case bc_i2c:
1.346 + case bc_i2s:
1.347 + out.append("/* number conversion */");
1.348 + break;
1.349 + case bc_iconst_0:
1.350 + case bc_dconst_0:
1.351 + case bc_lconst_0:
1.352 + case bc_fconst_0:
1.353 + out.append("stack.push(0);");
1.354 + break;
1.355 + case bc_iconst_1:
1.356 + case bc_lconst_1:
1.357 + case bc_fconst_1:
1.358 + case bc_dconst_1:
1.359 + out.append("stack.push(1);");
1.360 + break;
1.361 + case bc_iconst_2:
1.362 + case bc_fconst_2:
1.363 + out.append("stack.push(2);");
1.364 + break;
1.365 + case bc_iconst_3:
1.366 + out.append("stack.push(3);");
1.367 + break;
1.368 + case bc_iconst_4:
1.369 + out.append("stack.push(4);");
1.370 + break;
1.371 + case bc_iconst_5:
1.372 + out.append("stack.push(5);");
1.373 + break;
1.374 + case bc_ldc: {
1.375 + int indx = byteCodes[++i];
1.376 + CPEntry entry = jc.getConstantPool().get(indx);
1.377 + String v = encodeConstant(entry);
1.378 + out.append("stack.push(").append(v).append(");");
1.379 + break;
1.380 + }
1.381 + case bc_ldc_w:
1.382 + case bc_ldc2_w: {
1.383 + int indx = readIntArg(byteCodes, i);
1.384 + CPEntry entry = jc.getConstantPool().get(indx);
1.385 + i += 2;
1.386 + String v = encodeConstant(entry);
1.387 + out.append("stack.push(").append(v).append(");");
1.388 + break;
1.389 + }
1.390 + case bc_lcmp:
1.391 + case bc_fcmpl:
1.392 + case bc_fcmpg:
1.393 + case bc_dcmpl:
1.394 + case bc_dcmpg: {
1.395 + out.append("{ var delta = stack.pop() - stack.pop(); stack.push(delta < 0 ?-1 : (delta == 0 ? 0 : 1)); }");
1.396 + break;
1.397 + }
1.398 + case bc_if_icmpeq: {
1.399 + i = generateIf(byteCodes, i, "==");
1.400 + break;
1.401 + }
1.402 + case bc_ifeq: {
1.403 + int indx = i + readIntArg(byteCodes, i);
1.404 + out.append("if (stack.pop() == 0) { gt = " + indx);
1.405 + out.append("; continue; }");
1.406 + i += 2;
1.407 + break;
1.408 + }
1.409 + case bc_ifne: {
1.410 + int indx = i + readIntArg(byteCodes, i);
1.411 + out.append("if (stack.pop() != 0) { gt = " + indx);
1.412 + out.append("; continue; }");
1.413 + i += 2;
1.414 + break;
1.415 + }
1.416 + case bc_iflt: {
1.417 + int indx = i + readIntArg(byteCodes, i);
1.418 + out.append("if (stack.pop() < 0) { gt = " + indx);
1.419 + out.append("; continue; }");
1.420 + i += 2;
1.421 + break;
1.422 + }
1.423 + case bc_ifle: {
1.424 + int indx = i + readIntArg(byteCodes, i);
1.425 + out.append("if (stack.pop() <= 0) { gt = " + indx);
1.426 + out.append("; continue; }");
1.427 + i += 2;
1.428 + break;
1.429 + }
1.430 + case bc_ifgt: {
1.431 + int indx = i + readIntArg(byteCodes, i);
1.432 + out.append("if (stack.pop() > 0) { gt = " + indx);
1.433 + out.append("; continue; }");
1.434 + i += 2;
1.435 + break;
1.436 + }
1.437 + case bc_ifge: {
1.438 + int indx = i + readIntArg(byteCodes, i);
1.439 + out.append("if (stack.pop() >= 0) { gt = " + indx);
1.440 + out.append("; continue; }");
1.441 + i += 2;
1.442 + break;
1.443 + }
1.444 + case bc_ifnonnull: {
1.445 + int indx = i + readIntArg(byteCodes, i);
1.446 + out.append("if (stack.pop()) { gt = " + indx);
1.447 + out.append("; continue; }");
1.448 + i += 2;
1.449 + break;
1.450 + }
1.451 + case bc_ifnull: {
1.452 + int indx = i + readIntArg(byteCodes, i);
1.453 + out.append("if (!stack.pop()) { gt = " + indx);
1.454 + out.append("; continue; }");
1.455 + i += 2;
1.456 + break;
1.457 + }
1.458 + case bc_if_icmpne:
1.459 + i = generateIf(byteCodes, i, "!=");
1.460 + break;
1.461 + case bc_if_icmplt:
1.462 + i = generateIf(byteCodes, i, ">");
1.463 + break;
1.464 + case bc_if_icmple:
1.465 + i = generateIf(byteCodes, i, ">=");
1.466 + break;
1.467 + case bc_if_icmpgt:
1.468 + i = generateIf(byteCodes, i, "<");
1.469 + break;
1.470 + case bc_if_icmpge:
1.471 + i = generateIf(byteCodes, i, "<=");
1.472 + break;
1.473 + case bc_goto: {
1.474 + int indx = i + readIntArg(byteCodes, i);
1.475 + out.append("gt = " + indx).append("; continue;");
1.476 + i += 2;
1.477 + break;
1.478 + }
1.479 + case bc_invokeinterface:
1.480 + case bc_invokevirtual:
1.481 + i = invokeVirtualMethod(byteCodes, i);
1.482 + break;
1.483 + case bc_invokespecial:
1.484 + i = invokeStaticMethod(byteCodes, i, false);
1.485 + break;
1.486 + case bc_invokestatic:
1.487 + i = invokeStaticMethod(byteCodes, i, true);
1.488 + break;
1.489 + case bc_new: {
1.490 + int indx = readIntArg(byteCodes, i);
1.491 + CPClassInfo ci = jc.getConstantPool().getClass(indx);
1.492 + out.append("stack.push(");
1.493 + out.append("new ").append(ci.getClassName().getInternalName().replace('/','_'));
1.494 + out.append(");");
1.495 + addReference(ci.getClassName().getInternalName());
1.496 + i += 2;
1.497 + break;
1.498 + }
1.499 + case bc_newarray: {
1.500 + int type = byteCodes[i++];
1.501 + out.append("stack.push(new Array(stack.pop()));");
1.502 + break;
1.503 + }
1.504 + case bc_anewarray: {
1.505 + i += 2; // skip type of array
1.506 + out.append("stack.push(new Array(stack.pop()));");
1.507 + break;
1.508 + }
1.509 + case bc_arraylength:
1.510 + out.append("stack.push(stack.pop().length);");
1.511 + break;
1.512 + case bc_iastore:
1.513 + case bc_lastore:
1.514 + case bc_fastore:
1.515 + case bc_dastore:
1.516 + case bc_aastore:
1.517 + case bc_bastore:
1.518 + case bc_castore:
1.519 + case bc_sastore: {
1.520 + out.append("{ var value = stack.pop(); var indx = stack.pop(); stack.pop()[indx] = value; }");
1.521 + break;
1.522 + }
1.523 + case bc_iaload:
1.524 + case bc_laload:
1.525 + case bc_faload:
1.526 + case bc_daload:
1.527 + case bc_aaload:
1.528 + case bc_baload:
1.529 + case bc_caload:
1.530 + case bc_saload: {
1.531 + out.append("{ var indx = stack.pop(); stack.push(stack.pop()[indx]); }");
1.532 + break;
1.533 + }
1.534 + case bc_dup:
1.535 + out.append("stack.push(stack[stack.length - 1]);");
1.536 + break;
1.537 + case bc_bipush:
1.538 + out.append("stack.push(" + byteCodes[++i] + ");");
1.539 + break;
1.540 + case bc_getfield: {
1.541 + int indx = readIntArg(byteCodes, i);
1.542 + CPFieldInfo fi = (CPFieldInfo) jc.getConstantPool().get(indx);
1.543 + out.append("stack.push(stack.pop().").append(fi.getFieldName()).append(");");
1.544 + i += 2;
1.545 + break;
1.546 + }
1.547 + case bc_getstatic: {
1.548 + int indx = readIntArg(byteCodes, i);
1.549 + CPFieldInfo fi = (CPFieldInfo) jc.getConstantPool().get(indx);
1.550 + final String in = fi.getClassName().getInternalName();
1.551 + out.append("stack.push(").append(in.replace('/', '_'));
1.552 + out.append('_').append(fi.getFieldName()).append(");");
1.553 + i += 2;
1.554 + addReference(in);
1.555 + break;
1.556 + }
1.557 + case bc_putstatic: {
1.558 + int indx = readIntArg(byteCodes, i);
1.559 + CPFieldInfo fi = (CPFieldInfo) jc.getConstantPool().get(indx);
1.560 + final String in = fi.getClassName().getInternalName();
1.561 + out.append(in.replace('/', '_'));
1.562 + out.append('_').append(fi.getFieldName()).append(" = stack.pop();");
1.563 + i += 2;
1.564 + addReference(in);
1.565 + break;
1.566 + }
1.567 + case bc_putfield: {
1.568 + int indx = readIntArg(byteCodes, i);
1.569 + CPFieldInfo fi = (CPFieldInfo) jc.getConstantPool().get(indx);
1.570 + out.append("{ var v = stack.pop(); stack.pop().")
1.571 + .append(fi.getFieldName()).append(" = v; }");
1.572 + i += 2;
1.573 + break;
1.574 + }
1.575 + case bc_instanceof: {
1.576 + int indx = readIntArg(byteCodes, i);
1.577 + CPClassInfo ci = jc.getConstantPool().getClass(indx);
1.578 + out.append("stack.push(stack.pop().$instOf_")
1.579 + .append(ci.getClassName().getInternalName().replace('/', '_'))
1.580 + .append(" ? 1 : 0);");
1.581 + i += 2;
1.582 + }
1.583 +
1.584 + }
1.585 + out.append(" /*");
1.586 + for (int j = prev; j <= i; j++) {
1.587 + out.append(" ");
1.588 + final int cc = (byteCodes[j] + 256) % 256;
1.589 + out.append(Integer.toString(cc));
1.590 + }
1.591 + out.append("*/\n");
1.592 + }
1.593 + out.append(" }\n");
1.594 + }
1.595 +
1.596 + private int generateIf(byte[] byteCodes, int i, final String test) throws IOException {
1.597 + int indx = i + readIntArg(byteCodes, i);
1.598 + out.append("if (stack.pop() ").append(test).append(" stack.pop()) { gt = " + indx);
1.599 + out.append("; continue; }");
1.600 + return i + 2;
1.601 + }
1.602 +
1.603 + private int readIntArg(byte[] byteCodes, int offsetInstruction) {
1.604 + final int indxHi = byteCodes[offsetInstruction + 1] << 8;
1.605 + final int indxLo = byteCodes[offsetInstruction + 2];
1.606 + return (indxHi & 0xffffff00) | (indxLo & 0xff);
1.607 + }
1.608 +
1.609 + private static int countArgs(String descriptor, boolean[] hasReturnType, StringBuilder sig) {
1.610 + int cnt = 0;
1.611 + int i = 0;
1.612 + Boolean count = null;
1.613 + int firstPos = sig.length();
1.614 + while (i < descriptor.length()) {
1.615 + char ch = descriptor.charAt(i++);
1.616 + switch (ch) {
1.617 + case '(':
1.618 + count = true;
1.619 + continue;
1.620 + case ')':
1.621 + count = false;
1.622 + continue;
1.623 + case 'B':
1.624 + case 'C':
1.625 + case 'D':
1.626 + case 'F':
1.627 + case 'I':
1.628 + case 'J':
1.629 + case 'S':
1.630 + case 'Z':
1.631 + if (count) {
1.632 + cnt++;
1.633 + sig.append(ch);
1.634 + } else {
1.635 + hasReturnType[0] = true;
1.636 + sig.insert(firstPos, ch);
1.637 + }
1.638 + continue;
1.639 + case 'V':
1.640 + assert !count;
1.641 + hasReturnType[0] = false;
1.642 + sig.insert(firstPos, 'V');
1.643 + continue;
1.644 + case 'L':
1.645 + int next = descriptor.indexOf(';', i);
1.646 + if (count) {
1.647 + cnt++;
1.648 + sig.append(ch);
1.649 + sig.append(descriptor.substring(i, next).replace('/', '_'));
1.650 + } else {
1.651 + sig.insert(firstPos, descriptor.substring(i, next).replace('/', '_'));
1.652 + sig.insert(firstPos, ch);
1.653 + hasReturnType[0] = true;
1.654 + }
1.655 + i = next + 1;
1.656 + continue;
1.657 + case '[':
1.658 + //arrays++;
1.659 + continue;
1.660 + default:
1.661 + break; // invalid character
1.662 + }
1.663 + }
1.664 + return cnt;
1.665 + }
1.666 +
1.667 + private void generateStaticField(Variable v) throws IOException {
1.668 + out.append("\nvar ")
1.669 + .append(jc.getName().getInternalName().replace('/', '_'))
1.670 + .append('_').append(v.getName()).append(" = 0;");
1.671 + }
1.672 +
1.673 + private String findMethodName(Method m) {
1.674 + StringBuilder tmp = new StringBuilder();
1.675 + if ("<init>".equals(m.getName())) { // NOI18N
1.676 + tmp.append("consV"); // NOI18N
1.677 + } else if ("<clinit>".equals(m.getName())) { // NOI18N
1.678 + tmp.append("classV"); // NOI18N
1.679 + } else {
1.680 + tmp.append(m.getName());
1.681 + outType(m.getReturnType(), tmp);
1.682 + }
1.683 + List<Parameter> args = m.getParameters();
1.684 + for (Parameter t : args) {
1.685 + outType(t.getDescriptor(), tmp);
1.686 + }
1.687 + return tmp.toString();
1.688 + }
1.689 +
1.690 + private String findMethodName(CPMethodInfo mi, int[] cnt, boolean[] hasReturn) {
1.691 + StringBuilder name = new StringBuilder();
1.692 + if ("<init>".equals(mi.getName())) { // NOI18N
1.693 + name.append("cons"); // NOI18N
1.694 + } else {
1.695 + name.append(mi.getName());
1.696 + }
1.697 + cnt[0] = countArgs(mi.getDescriptor(), hasReturn, name);
1.698 + return name.toString();
1.699 + }
1.700 +
1.701 + private int invokeStaticMethod(byte[] byteCodes, int i, boolean isStatic)
1.702 + throws IOException {
1.703 + int methodIndex = readIntArg(byteCodes, i);
1.704 + CPMethodInfo mi = (CPMethodInfo) jc.getConstantPool().get(methodIndex);
1.705 + boolean[] hasReturn = { false };
1.706 + int[] cnt = { 0 };
1.707 + String mn = findMethodName(mi, cnt, hasReturn);
1.708 + out.append("{ ");
1.709 + for (int j = cnt[0] - 1; j >= 0; j--) {
1.710 + out.append("var v" + j).append(" = stack.pop(); ");
1.711 + }
1.712 +
1.713 + if (hasReturn[0]) {
1.714 + out.append("stack.push(");
1.715 + }
1.716 + final String in = mi.getClassName().getInternalName();
1.717 + out.append(in.replace('/', '_'));
1.718 + out.append('_');
1.719 + out.append(mn);
1.720 + out.append('(');
1.721 + String sep = "";
1.722 + if (!isStatic) {
1.723 + out.append("stack.pop()");
1.724 + sep = ", ";
1.725 + }
1.726 + for (int j = 0; j < cnt[0]; j++) {
1.727 + out.append(sep);
1.728 + out.append("v" + j);
1.729 + sep = ", ";
1.730 + }
1.731 + out.append(")");
1.732 + if (hasReturn[0]) {
1.733 + out.append(")");
1.734 + }
1.735 + out.append("; }");
1.736 + i += 2;
1.737 + addReference(in);
1.738 + return i;
1.739 + }
1.740 + private int invokeVirtualMethod(byte[] byteCodes, int i)
1.741 + throws IOException {
1.742 + int methodIndex = readIntArg(byteCodes, i);
1.743 + CPMethodInfo mi = (CPMethodInfo) jc.getConstantPool().get(methodIndex);
1.744 + boolean[] hasReturn = { false };
1.745 + int[] cnt = { 0 };
1.746 + String mn = findMethodName(mi, cnt, hasReturn);
1.747 + out.append("{ ");
1.748 + for (int j = cnt[0] - 1; j >= 0; j--) {
1.749 + out.append("var v" + j).append(" = stack.pop(); ");
1.750 + }
1.751 + out.append("var self = stack.pop(); ");
1.752 + if (hasReturn[0]) {
1.753 + out.append("stack.push(");
1.754 + }
1.755 + out.append("self.");
1.756 + out.append(mn);
1.757 + out.append('(');
1.758 + out.append("self");
1.759 + for (int j = 0; j < cnt[0]; j++) {
1.760 + out.append(", ");
1.761 + out.append("v" + j);
1.762 + }
1.763 + out.append(")");
1.764 + if (hasReturn[0]) {
1.765 + out.append(")");
1.766 + }
1.767 + out.append("; }");
1.768 + i += 2;
1.769 + return i;
1.770 + }
1.771 +
1.772 + private void addReference(String cn) {
1.773 + if (references != null) {
1.774 + references.add(cn);
1.775 + }
1.776 + }
1.777 +
1.778 + private void outType(final String d, StringBuilder out) {
1.779 + if (d.charAt(0) == 'L') {
1.780 + assert d.charAt(d.length() - 1) == ';';
1.781 + out.append(d.replace('/', '_').substring(0, d.length() - 1));
1.782 + } else {
1.783 + out.append(d);
1.784 + }
1.785 + }
1.786 +
1.787 + private String encodeConstant(CPEntry entry) {
1.788 + final String v;
1.789 + if (entry instanceof CPStringInfo) {
1.790 + v = "\"" + entry.getValue().toString().replace("\"", "\\\"") + "\"";
1.791 + } else {
1.792 + v = entry.getValue().toString();
1.793 + }
1.794 + return v;
1.795 + }
1.796 +}