bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/codegen/utils/MethodBuilderBase.java

   1 package org.simantics.scl.compiler.internal.codegen.utils;
   2
   3 import org.cojen.classfile.MethodDesc;
   4 import org.cojen.classfile.TypeDesc;
   5 import org.objectweb.asm.Label;
   6 import org.objectweb.asm.MethodVisitor;
   7 import org.objectweb.asm.Opcodes;
   8 import org.objectweb.asm.Type;
   9
  10 public class MethodBuilderBase {
  11     private ClassBuilder classBuilder;
  12     private MethodVisitor methodVisitor;
  13     private LocalVariable[] parameters;
  14     private int localVariableCount = 0;
  15
  16     public MethodBuilderBase(ClassBuilder classBuilder, boolean isStatic, MethodVisitor methodVisitor, TypeDesc[] parameterTypes) {
  17         this.classBuilder = classBuilder;
  18         this.methodVisitor = methodVisitor;
  19         this.parameters = new LocalVariable[parameterTypes.length];
  20         if(!isStatic)
  21             ++localVariableCount;
  22         for(int i=0;i<parameterTypes.length;++i) {
  23             parameters[i] = createLocalVariable("p" + i, parameterTypes[i]);
  24             methodVisitor.visitParameter("p" + i, Opcodes.ACC_PUBLIC);
  25         }
  26         methodVisitor.visitCode();
  27     }
  28
  29     public LocalVariable getThis(TypeDesc type) {
  30         return new LocalVariable(0, type);
  31     }
  32
  33     public void loadConstant(boolean value) {
  34         if(value)
  35             methodVisitor.visitInsn(Opcodes.ICONST_1);
  36         else
  37             methodVisitor.visitInsn(Opcodes.ICONST_0);
  38     }
  39
  40     public void loadConstant(int value) {
  41         if (value >= -1 && value <= 5) {
  42             methodVisitor.visitInsn(Opcodes.ICONST_0 + value);
  43         } else if (value >= Byte.MIN_VALUE && value <= Byte.MAX_VALUE) {
  44             methodVisitor.visitIntInsn(Opcodes.BIPUSH, value);
  45         } else if (value >= Short.MIN_VALUE && value <= Short.MAX_VALUE) {
  46             methodVisitor.visitIntInsn(Opcodes.SIPUSH, value);
  47         } else {
  48             methodVisitor.visitLdcInsn(value);
  49         }
  50     }
  51
  52     public void loadConstant(long value) {
  53         if(value == 0L)
  54             methodVisitor.visitInsn(Opcodes.LCONST_0);
  55         else if(value == 1L)
  56             methodVisitor.visitInsn(Opcodes.LCONST_1);
  57         else
  58             methodVisitor.visitLdcInsn(value);
  59     }
  60
  61     public void loadConstant(float value) {
  62         if(value == 0.0f)
  63             methodVisitor.visitInsn(Opcodes.FCONST_0);
  64         else if(value == 1.0f)
  65             methodVisitor.visitInsn(Opcodes.FCONST_1);
  66         else
  67             methodVisitor.visitLdcInsn(value);
  68     }
  69
  70     public void loadConstant(double value) {
  71         if(value == 0.0)
  72             methodVisitor.visitInsn(Opcodes.DCONST_0);
  73         else if(value == 1.0)
  74             methodVisitor.visitInsn(Opcodes.DCONST_1);
  75         else
  76             methodVisitor.visitLdcInsn(value);
  77     }
  78
  79     public void loadConstant(String value) {
  80         methodVisitor.visitLdcInsn(value);
  81     }
  82
  83     public void loadConstant(TypeDesc value) {
  84         if(value.isPrimitive())
  85             loadStaticField(getClassName(value.toObjectType()), "TYPE", Constants.CLASS);
  86         else
  87             methodVisitor.visitLdcInsn(Type.getType(value.getDescriptor()));
  88     }
  89
  90     public void dup() {
  91         methodVisitor.visitInsn(Opcodes.DUP);
  92     }
  93
  94     public void dup2() {
  95         methodVisitor.visitInsn(Opcodes.DUP2);
  96     }
  97
  98     public void dupX1() {
  99         methodVisitor.visitInsn(Opcodes.DUP_X1);
 100     }
 101
 102     public void swap() {
 103         methodVisitor.visitInsn(Opcodes.SWAP);
 104     }
 105
 106     public void pop() {
 107         methodVisitor.visitInsn(Opcodes.POP);
 108     }
 109
 110     public void pop2() {
 111         methodVisitor.visitInsn(Opcodes.POP2);
 112     }
 113
 114     public void convert(TypeDesc fromType, TypeDesc toType) {
 115         switch(fromType.getTypeCode() + 16*toType.getTypeCode()) {
 116         case TypeDesc.OBJECT_CODE + 16*TypeDesc.BOOLEAN_CODE:
 117             methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Boolean", "booleanValue", "()Z", false);
 118             return;
 119         case TypeDesc.OBJECT_CODE + 16*TypeDesc.INT_CODE:
 120             methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Integer", "intValue", "()I", false);
 121             return;
 122         case TypeDesc.OBJECT_CODE + 16*TypeDesc.FLOAT_CODE:
 123             methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Float", "floatValue", "()F", false);
 124             return;
 125         case TypeDesc.OBJECT_CODE + 16*TypeDesc.DOUBLE_CODE:
 126             methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Double", "doubleValue", "()D", false);
 127             return;
 128         case TypeDesc.OBJECT_CODE + 16*TypeDesc.CHAR_CODE:
 129             methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Character", "charValue", "()C", false);
 130             return;
 131         case TypeDesc.OBJECT_CODE + 16*TypeDesc.LONG_CODE:
 132             methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Long", "longValue", "()J", false);
 133             return;
 134         case TypeDesc.OBJECT_CODE + 16*TypeDesc.SHORT_CODE:
 135             methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Short", "shortValue", "()S", false);
 136             return;
 137         case TypeDesc.OBJECT_CODE + 16*TypeDesc.BYTE_CODE:
 138             methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Byte", "byteValue", "()B", false);
 139             return;
 140         case TypeDesc.DOUBLE_CODE + 16*TypeDesc.FLOAT_CODE:
 141             methodVisitor.visitInsn(Opcodes.D2F);
 142             return;
 143         case TypeDesc.FLOAT_CODE + 16*TypeDesc.DOUBLE_CODE:
 144             methodVisitor.visitInsn(Opcodes.F2D);
 145             return;
 146         case TypeDesc.INT_CODE + 16*TypeDesc.DOUBLE_CODE:
 147             methodVisitor.visitInsn(Opcodes.I2D);
 148             return;
 149         case TypeDesc.DOUBLE_CODE + 16*TypeDesc.INT_CODE:
 150             methodVisitor.visitInsn(Opcodes.D2I);
 151             return;
 152         case TypeDesc.INT_CODE + 16*TypeDesc.FLOAT_CODE:
 153             methodVisitor.visitInsn(Opcodes.I2F);
 154             return;
 155         case TypeDesc.FLOAT_CODE + 16*TypeDesc.INT_CODE:
 156             methodVisitor.visitInsn(Opcodes.F2I);
 157             return;
 158         case TypeDesc.LONG_CODE + 16*TypeDesc.FLOAT_CODE:
 159             methodVisitor.visitInsn(Opcodes.L2F);
 160             return;
 161         case TypeDesc.FLOAT_CODE + 16*TypeDesc.LONG_CODE:
 162             methodVisitor.visitInsn(Opcodes.F2L);
 163             return;
 164         case TypeDesc.LONG_CODE + 16*TypeDesc.DOUBLE_CODE:
 165             methodVisitor.visitInsn(Opcodes.L2D);
 166             return;
 167         case TypeDesc.DOUBLE_CODE + 16*TypeDesc.LONG_CODE:
 168             methodVisitor.visitInsn(Opcodes.D2L);
 169             return;
 170         case TypeDesc.INT_CODE + 16*TypeDesc.LONG_CODE:
 171             methodVisitor.visitInsn(Opcodes.I2L);
 172             return;
 173         case TypeDesc.LONG_CODE + 16*TypeDesc.INT_CODE:
 174             methodVisitor.visitInsn(Opcodes.L2I);
 175             return;
 176         case TypeDesc.INT_CODE + 16*TypeDesc.SHORT_CODE:
 177             methodVisitor.visitInsn(Opcodes.I2S);
 178             return;
 179         case TypeDesc.SHORT_CODE + 16*TypeDesc.INT_CODE:
 180         case TypeDesc.BOOLEAN_CODE + 16*TypeDesc.INT_CODE:
 181             // NOP
 182             return;
 183         case TypeDesc.INT_CODE + 16*TypeDesc.BYTE_CODE:
 184             methodVisitor.visitInsn(Opcodes.I2B);
 185             return;
 186         case TypeDesc.BYTE_CODE + 16*TypeDesc.INT_CODE:
 187             // NOP
 188             return;
 189         case TypeDesc.INT_CODE + 16*TypeDesc.CHAR_CODE:
 190             methodVisitor.visitInsn(Opcodes.I2C);
 191             return;
 192         case TypeDesc.CHAR_CODE + 16*TypeDesc.INT_CODE:
 193             // NOP
 194             return;
 195         default:
 196             System.out.println("convert: " + fromType + " -> " + toType);
 197         }
 198     }
 199
 200     public void convert(TypeDesc fromType, TypeDesc toType,
 201             int convertFpNormal) {
 202         convert(fromType, toType);
 203     }
 204
 205     public LocalVariable createLocalVariable(String name, TypeDesc type) {
 206         int index = localVariableCount;
 207         localVariableCount += type == TypeDesc.DOUBLE || type == TypeDesc.LONG ? 2 : 1;
 208         return new LocalVariable(index, type);
 209     }
 210
 211     public void storeLocal(LocalVariable local) {
 212         switch(local.type.getTypeCode()) {
 213         case TypeDesc.BOOLEAN_CODE:
 214         case TypeDesc.BYTE_CODE:
 215         case TypeDesc.CHAR_CODE:
 216         case TypeDesc.SHORT_CODE:
 217         case TypeDesc.INT_CODE:
 218             methodVisitor.visitVarInsn(Opcodes.ISTORE, local.index);
 219             break;
 220         case TypeDesc.FLOAT_CODE:
 221             methodVisitor.visitVarInsn(Opcodes.FSTORE, local.index);
 222             break;
 223         case TypeDesc.DOUBLE_CODE:
 224             methodVisitor.visitVarInsn(Opcodes.DSTORE, local.index);
 225             break;
 226         case TypeDesc.LONG_CODE:
 227             methodVisitor.visitVarInsn(Opcodes.LSTORE, local.index);
 228             break;
 229         case TypeDesc.OBJECT_CODE:
 230             methodVisitor.visitVarInsn(Opcodes.ASTORE, local.index);
 231             break;
 232         default: throw new IllegalArgumentException();
 233         }
 234     }
 235
 236     public void ifZeroComparisonBranch(Label location, String choice) {
 237         int opcode;
 238         if(choice.equals("!="))
 239             opcode = Opcodes.IFNE;
 240         else if(choice.equals("=="))
 241             opcode = Opcodes.IFEQ;
 242         else if(choice.equals("<"))
 243             opcode = Opcodes.IFLT;
 244         else if(choice.equals(">"))
 245             opcode = Opcodes.IFGT;
 246         else if(choice.equals("<="))
 247             opcode = Opcodes.IFLE;
 248         else if(choice.equals(">="))
 249             opcode = Opcodes.IFGE;
 250         else
 251             throw new IllegalArgumentException("Invalid choice \"" + choice + "\".");
 252         methodVisitor.visitJumpInsn(opcode, location);
 253     }
 254
 255     public void ifComparisonBranch(Label location, String choice, TypeDesc type) {
 256         switch(type.getTypeCode()) {
 257         case TypeDesc.BOOLEAN_CODE:
 258         case TypeDesc.BYTE_CODE:
 259         case TypeDesc.CHAR_CODE:
 260         case TypeDesc.SHORT_CODE:
 261         case TypeDesc.INT_CODE: {
 262             int opcode;
 263             if(choice.equals("!="))
 264                 opcode = Opcodes.IF_ICMPNE;
 265             else if(choice.equals("=="))
 266                 opcode = Opcodes.IF_ICMPEQ;
 267             else if(choice.equals("<"))
 268                 opcode = Opcodes.IF_ICMPLT;
 269             else if(choice.equals(">"))
 270                 opcode = Opcodes.IF_ICMPGT;
 271             else if(choice.equals("<="))
 272                 opcode = Opcodes.IF_ICMPLE;
 273             else if(choice.equals(">="))
 274                 opcode = Opcodes.IF_ICMPGE;
 275             else
 276                 throw new IllegalArgumentException("Invalid choice \"" + choice + "\".");
 277             methodVisitor.visitJumpInsn(opcode, location);
 278         } break;
 279         case TypeDesc.FLOAT_CODE:
 280             methodVisitor.visitInsn(Opcodes.FCMPL);
 281             ifZeroComparisonBranch(location, choice);
 282             break;
 283         case TypeDesc.DOUBLE_CODE:
 284             methodVisitor.visitInsn(Opcodes.DCMPL);
 285             ifZeroComparisonBranch(location, choice);
 286             break;
 287         case TypeDesc.LONG_CODE:
 288             methodVisitor.visitInsn(Opcodes.LCMP);
 289             ifZeroComparisonBranch(location, choice);
 290             break;
 291         case TypeDesc.OBJECT_CODE: {
 292             int opcode;
 293             if(choice.equals("!="))
 294                 opcode = Opcodes.IF_ACMPNE;
 295             else if(choice.equals("=="))
 296                 opcode = Opcodes.IF_ACMPEQ;
 297             else
 298                 throw new IllegalArgumentException("Invalid choice \"" + choice + "\".");
 299             methodVisitor.visitJumpInsn(opcode, location);
 300         } break;
 301         default: throw new IllegalArgumentException();
 302         }
 303     }
 304
 305     public void ifNullBranch(Label location, boolean choice) {
 306         methodVisitor.visitJumpInsn(choice ? Opcodes.IFNULL : Opcodes.IFNONNULL, location);
 307     }
 308
 309     public void branch(Label location) {
 310         methodVisitor.visitJumpInsn(Opcodes.GOTO, location);
 311     }
 312
 313     public Label createLabel() {
 314         return new Label();
 315     }
 316
 317     public void setLocation(Label label) {
 318         methodVisitor.visitLabel(label);
 319     }
 320
 321     public void loadLocal(LocalVariable local) {
 322         switch(local.type.getTypeCode()) {
 323         case TypeDesc.BOOLEAN_CODE:
 324         case TypeDesc.BYTE_CODE:
 325         case TypeDesc.CHAR_CODE:
 326         case TypeDesc.SHORT_CODE:
 327         case TypeDesc.INT_CODE:
 328             methodVisitor.visitVarInsn(Opcodes.ILOAD, local.index);
 329             break;
 330         case TypeDesc.FLOAT_CODE:
 331             methodVisitor.visitVarInsn(Opcodes.FLOAD, local.index);
 332             break;
 333         case TypeDesc.DOUBLE_CODE:
 334             methodVisitor.visitVarInsn(Opcodes.DLOAD, local.index);
 335             break;
 336         case TypeDesc.LONG_CODE:
 337             methodVisitor.visitVarInsn(Opcodes.LLOAD, local.index);
 338             break;
 339         case TypeDesc.OBJECT_CODE:
 340             methodVisitor.visitVarInsn(Opcodes.ALOAD, local.index);
 341             break;
 342         default: throw new IllegalArgumentException();
 343         }
 344     }
 345
 346     public void loadNull() {
 347         methodVisitor.visitInsn(Opcodes.ACONST_NULL);
 348     }
 349
 350     public void loadFromArray(TypeDesc type) {
 351         switch(type.getTypeCode()) {
 352         case TypeDesc.BOOLEAN_CODE:
 353             methodVisitor.visitInsn(Opcodes.BALOAD);
 354             break;
 355         case TypeDesc.BYTE_CODE:
 356             methodVisitor.visitInsn(Opcodes.BALOAD);
 357             break;
 358         case TypeDesc.CHAR_CODE:
 359             methodVisitor.visitInsn(Opcodes.CALOAD);
 360             break;
 361         case TypeDesc.SHORT_CODE:
 362             methodVisitor.visitInsn(Opcodes.SALOAD);
 363             break;
 364         case TypeDesc.INT_CODE:
 365             methodVisitor.visitInsn(Opcodes.IALOAD);
 366             break;
 367         case TypeDesc.FLOAT_CODE:
 368             methodVisitor.visitInsn(Opcodes.FALOAD);
 369             break;
 370         case TypeDesc.DOUBLE_CODE:
 371             methodVisitor.visitInsn(Opcodes.DALOAD);
 372             break;
 373         case TypeDesc.LONG_CODE:
 374             methodVisitor.visitInsn(Opcodes.LALOAD);
 375             break;
 376         case TypeDesc.OBJECT_CODE:
 377             methodVisitor.visitInsn(Opcodes.AALOAD);
 378             break;
 379         default: throw new IllegalArgumentException();
 380         }
 381     }
 382
 383     public void invokeInterface(String className, String methodName,
 384             TypeDesc ret, TypeDesc[] params) {
 385         checkClassName(className);
 386         checkParameters(params);
 387         methodVisitor.visitMethodInsn(Opcodes.INVOKEINTERFACE, className, methodName,
 388                 MethodDesc.forArguments(ret, params).getDescriptor(), true);
 389     }
 390
 391     public void invokeInterface(TypeDesc className, String methodName,
 392             TypeDesc ret, TypeDesc[] params) {
 393         invokeInterface(getClassName(className), methodName, ret, params);
 394     }
 395
 396     public void invokeVirtual(String className, String methodName,
 397             TypeDesc ret, TypeDesc[] params) {
 398         checkClassName(className);
 399         checkParameters(params);
 400         methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, className, methodName,
 401                 MethodDesc.forArguments(ret, params).getDescriptor(), false);
 402     }
 403
 404     public void invokeVirtual(TypeDesc className, String methodName, TypeDesc ret,
 405             TypeDesc[] params) {
 406         invokeVirtual(getClassName(className), methodName, ret, params);
 407     }
 408
 409     public void invokeConstructor(String className, TypeDesc[] params) {
 410         checkClassName(className);
 411         checkParameters(params);
 412         methodVisitor.visitMethodInsn(Opcodes.INVOKESPECIAL, className, "<init>",
 413                 MethodDesc.forArguments(TypeDesc.VOID, params).getDescriptor(), false);
 414     }
 415
 416     public void invokeConstructor(TypeDesc className, TypeDesc[] params) {
 417         invokeConstructor(getClassName(className), params);
 418     }
 419
 420     public void invokeSuperConstructor(TypeDesc[] params) {
 421         invokeConstructor(classBuilder.getSuperClassName(), params);
 422     }
 423
 424     public void invokeStatic(String className, String methodName, TypeDesc ret,
 425             TypeDesc[] params) {
 426         checkClassName(className);
 427         checkParameters(params);
 428         methodVisitor.visitMethodInsn(Opcodes.INVOKESTATIC, className, methodName,
 429                 MethodDesc.forArguments(ret, params).getDescriptor(), false);
 430     }
 431
 432     public void invokeStatic(TypeDesc className, String methodName, TypeDesc ret,
 433             TypeDesc[] params) {
 434         invokeStatic(getClassName(className), methodName, ret, params);
 435     }
 436
 437     public void newObject(TypeDesc type) {
 438         methodVisitor.visitTypeInsn(Opcodes.NEW, getClassName(type));
 439     }
 440
 441     public void newObject(String type) {
 442         methodVisitor.visitTypeInsn(Opcodes.NEW, type);
 443     }
 444
 445     public void newObject(TypeDesc type, int dimensions) {
 446         methodVisitor.visitMultiANewArrayInsn(type.getDescriptor(), dimensions);
 447     }
 448
 449     public void loadStaticField(String className, String fieldName, TypeDesc type) {
 450         checkClassName(className);
 451         methodVisitor.visitFieldInsn(Opcodes.GETSTATIC, className, fieldName, type.getDescriptor());
 452     }
 453
 454     public void loadStaticField(TypeDesc className, String fieldName,
 455             TypeDesc type) {
 456         loadStaticField(getClassName(className), fieldName, type);
 457     }
 458
 459     public void loadField(String className, String fieldName, TypeDesc type) {
 460         checkClassName(className);
 461         methodVisitor.visitFieldInsn(Opcodes.GETFIELD, className, fieldName, type.getDescriptor());
 462     }
 463
 464     public void storeStaticField(String className, String fieldName,
 465             TypeDesc type) {
 466         checkClassName(className);
 467         methodVisitor.visitFieldInsn(Opcodes.PUTSTATIC, className, fieldName, type.getDescriptor());
 468     }
 469
 470     public void storeField(String className, String fieldName, TypeDesc type) {
 471         checkClassName(className);
 472         methodVisitor.visitFieldInsn(Opcodes.PUTFIELD, className, fieldName, type.getDescriptor());
 473     }
 474
 475     public void storeToArray(TypeDesc type) {
 476         switch(type.getTypeCode()) {
 477         case TypeDesc.BOOLEAN_CODE:
 478             methodVisitor.visitInsn(Opcodes.BASTORE);
 479             break;
 480         case TypeDesc.BYTE_CODE:
 481             methodVisitor.visitInsn(Opcodes.BASTORE);
 482             break;
 483         case TypeDesc.CHAR_CODE:
 484             methodVisitor.visitInsn(Opcodes.CASTORE);
 485             break;
 486         case TypeDesc.SHORT_CODE:
 487             methodVisitor.visitInsn(Opcodes.SASTORE);
 488             break;
 489         case TypeDesc.INT_CODE:
 490             methodVisitor.visitInsn(Opcodes.IASTORE);
 491             break;
 492         case TypeDesc.FLOAT_CODE:
 493             methodVisitor.visitInsn(Opcodes.FASTORE);
 494             break;
 495         case TypeDesc.DOUBLE_CODE:
 496             methodVisitor.visitInsn(Opcodes.DASTORE);
 497             break;
 498         case TypeDesc.LONG_CODE:
 499             methodVisitor.visitInsn(Opcodes.LASTORE);
 500             break;
 501         case TypeDesc.OBJECT_CODE:
 502             methodVisitor.visitInsn(Opcodes.AASTORE);
 503             break;
 504         default: throw new IllegalArgumentException();
 505         }
 506     }
 507
 508     public void math(int opcode) {
 509         methodVisitor.visitInsn(opcode);
 510     }
 511
 512     public void throwObject() {
 513         methodVisitor.visitInsn(Opcodes.ATHROW);
 514     }
 515
 516     public void checkCast(TypeDesc type) {
 517         methodVisitor.visitTypeInsn(Opcodes.CHECKCAST, getClassName(type));
 518     }
 519
 520     public void instanceOf(TypeDesc type) {
 521         methodVisitor.visitTypeInsn(Opcodes.INSTANCEOF, getClassName(type));
 522     }
 523
 524     public void arrayLength() {
 525         methodVisitor.visitInsn(Opcodes.ARRAYLENGTH);
 526     }
 527
 528     public void loadThis() {
 529         methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
 530     }
 531
 532     public LocalVariable getParameter(int index) {
 533         return parameters[index];
 534     }
 535
 536     public void returnVoid() {
 537         methodVisitor.visitInsn(Opcodes.RETURN);
 538     }
 539
 540     public void returnValue(TypeDesc type) {
 541         switch(type.getTypeCode()) {
 542         case TypeDesc.VOID_CODE:
 543             methodVisitor.visitInsn(Opcodes.RETURN);
 544             break;
 545         case TypeDesc.BOOLEAN_CODE:
 546         case TypeDesc.BYTE_CODE:
 547         case TypeDesc.CHAR_CODE:
 548         case TypeDesc.SHORT_CODE:
 549         case TypeDesc.INT_CODE:
 550             methodVisitor.visitInsn(Opcodes.IRETURN);
 551             break;
 552         case TypeDesc.FLOAT_CODE:
 553             methodVisitor.visitInsn(Opcodes.FRETURN);
 554             break;
 555         case TypeDesc.DOUBLE_CODE:
 556             methodVisitor.visitInsn(Opcodes.DRETURN);
 557             break;
 558         case TypeDesc.LONG_CODE:
 559             methodVisitor.visitInsn(Opcodes.LRETURN);
 560             break;
 561         case TypeDesc.OBJECT_CODE:
 562             methodVisitor.visitInsn(Opcodes.ARETURN);
 563             break;
 564         default: throw new IllegalArgumentException();
 565         }
 566     }
 567
 568     public void finish() {
 569         methodVisitor.visitMaxs(0, 0);
 570         methodVisitor.visitEnd();
 571     }
 572
 573     public String getClassName() {
 574         return classBuilder.className;
 575     }
 576
 577     public static String getClassName(TypeDesc typeDesc) {
 578         if(typeDesc.isArray())
 579             return typeDesc.getDescriptor();
 580         else
 581             return typeDesc.getFullName().replace('.', '/');
 582     }
 583
 584     private static void checkClassName(String className) {
 585         ClassBuilder.checkClassName(className);
 586     }
 587
 588     public static String getClassName(Class<?> clazz) {
 589         return clazz.getName().replace('.', '/');
 590     }
 591
 592     public void switch_(int[] values, Label[] labels, Label defaultLabel) {
 593         int lo = values[0];
 594         int hi = values[values.length-1];
 595         long table_space_cost = 4 + ((long) hi - lo + 1); // words
 596         long table_time_cost = 3; // comparisons
 597         long lookup_space_cost = 3 + 2 * (long) values.length;
 598         long lookup_time_cost = values.length;
 599         if(values.length > 0 &&
 600             table_space_cost + 3 * table_time_cost <=
 601             lookup_space_cost + 3 * lookup_time_cost) {
 602             Label[] table = new Label[hi - lo + 1];
 603             for(int i=0,j=0;i<table.length;++i) {
 604                 int id = lo+i;
 605                 if(values[j] == id) {
 606                     table[i] = labels[j];
 607                     ++j;
 608                 }
 609                 else
 610                     table[i] = defaultLabel;
 611             }
 612             methodVisitor.visitTableSwitchInsn(lo, hi, defaultLabel, table);
 613         }
 614         else
 615             methodVisitor.visitLookupSwitchInsn(defaultLabel, values, labels);
 616     }
 617
 618     private static void checkParameters(TypeDesc[] params) {
 619         for(TypeDesc param : params)
 620             if(param.equals(TypeDesc.VOID))
 621                 throw new IllegalArgumentException();
 622     }
 623 }