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vm.js
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vm.js
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/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim: set shiftwidth=4 tabstop=4 autoindent cindent expandtab: */
'use strict';
var VM = {};
VM.Yield = {};
VM.Pause = {};
VM.DEBUG = false;
VM.DEBUG_PRINT_ALL_EXCEPTIONS = false;
VM.traceLog = "";
VM.trace = function(type, pid, methodInfo, returnVal) {
VM.traceLog += type + " " + pid + " " + methodInfo.classInfo.className + "." +
methodInfo.name + ":" + methodInfo.signature +
(returnVal ? (" " + returnVal) : "") + "\n";
}
VM.execute = function(ctx) {
var frame = ctx.current();
var cp = frame.cp;
var stack = frame.stack;
function pushFrame(methodInfo, consumes) {
var caller = frame;
frame = ctx.pushFrame(methodInfo, consumes);
stack = frame.stack;
cp = frame.cp;
if (frame.isSynchronized) {
if (!frame.lockObject) {
frame.lockObject = methodInfo.isStatic
? methodInfo.classInfo.getClassObject(ctx)
: frame.getLocal(0);
}
ctx.monitorEnter(frame.lockObject);
}
return frame;
}
function popFrame(consumes) {
if (frame.lockObject)
ctx.monitorExit(frame.lockObject);
var callee = frame;
frame = ctx.popFrame();
stack = frame.stack;
cp = frame.cp;
switch (consumes) {
case 2:
stack.push2(callee.stack.pop2());
break;
case 1:
stack.push(callee.stack.pop());
break;
}
return frame;
}
function buildExceptionLog(ex, stackTrace) {
var className = ex.class.className;
var detailMessage = util.fromJavaString(CLASSES.getField(ex.class, "I.detailMessage.Ljava/lang/String;").get(ex));
return className + ": " + (detailMessage || "") + "\n" + stackTrace.join("\n") + "\n\n";
}
function throw_(ex, ctx) {
var exClass = ex.class;
var stackTrace = [];
do {
var exception_table = frame.methodInfo.exception_table;
var handler_pc = null;
for (var i=0; exception_table && i<exception_table.length; i++) {
if (frame.ip >= exception_table[i].start_pc && frame.ip <= exception_table[i].end_pc) {
if (exception_table[i].catch_type === 0) {
handler_pc = exception_table[i].handler_pc;
} else {
var classInfo = resolve(OPCODES.athrow, exception_table[i].catch_type);
if (ex.class.isAssignableTo(classInfo)) {
handler_pc = exception_table[i].handler_pc;
break;
}
}
}
}
var classInfo = frame.methodInfo.classInfo;
if (classInfo && classInfo.className) {
stackTrace.push(" - " + classInfo.className + "." + frame.methodInfo.name + "(), bci=" + frame.ip);
}
if (handler_pc != null) {
stack.length = 0;
stack.push(ex);
frame.ip = handler_pc;
if (VM.DEBUG_PRINT_ALL_EXCEPTIONS) {
console.error(buildExceptionLog(ex, stackTrace));
}
return;
}
popFrame(0);
} while (frame.methodInfo);
ctx.kill();
throw new Error(buildExceptionLog(ex, stackTrace));
}
function checkArrayAccess(refArray, idx) {
if (!refArray) {
ctx.raiseExceptionAndYield("java/lang/NullPointerException");
return false;
}
if (idx < 0 || idx >= refArray.length) {
ctx.raiseExceptionAndYield("java/lang/ArrayIndexOutOfBoundsException", idx);
return false;
}
return true;
}
function classInitCheck(classInfo, ip) {
if (classInfo.isArrayClass || ctx.runtime.initialized[classInfo.className])
return;
frame.ip = ip;
ctx.pushClassInitFrame(classInfo);
throw VM.Yield;
}
function resolve(op, idx) {
var constant = cp[idx];
if (!constant.tag)
return constant;
switch(constant.tag) {
case TAGS.CONSTANT_Integer:
constant = constant.integer;
break;
case TAGS.CONSTANT_Float:
constant = constant.float;
break;
case TAGS.CONSTANT_String:
constant = ctx.newString(cp[constant.string_index].bytes);
break;
case TAGS.CONSTANT_Long:
constant = Long.fromBits(constant.lowBits, constant.highBits);
break;
case TAGS.CONSTANT_Double:
constant = constant.double;
break;
case TAGS.CONSTANT_Class:
constant = CLASSES.getClass(cp[constant.name_index].bytes);
break;
case TAGS.CONSTANT_Fieldref:
var classInfo = resolve(op, constant.class_index);
var fieldName = cp[cp[constant.name_and_type_index].name_index].bytes;
var signature = cp[cp[constant.name_and_type_index].signature_index].bytes;
constant = CLASSES.getField(classInfo, ((op === 0xb2 || op === 0xb3) ? "S" : "I") + "." + fieldName + "." + signature);
if (!constant)
ctx.raiseExceptionAndYield("java/lang/RuntimeException",
classInfo.className + "." + fieldName + "." + signature + " not found");
break;
case TAGS.CONSTANT_Methodref:
case TAGS.CONSTANT_InterfaceMethodref:
var classInfo = resolve(op, constant.class_index);
var methodName = cp[cp[constant.name_and_type_index].name_index].bytes;
var signature = cp[cp[constant.name_and_type_index].signature_index].bytes;
constant = CLASSES.getMethod(classInfo, ((op === 0xb8) ? "S" : "I") + "." + methodName + "." + signature);
if (!constant)
ctx.raiseExceptionAndYield("java/lang/RuntimeException",
classInfo.className + "." + methodName + "." + signature + " not found");
break;
default:
throw new Error("not support constant type");
}
return cp[idx] = constant;
}
while (true) {
var op = frame.read8();
// console.trace(ctx.thread.pid, frame.methodInfo.classInfo.className + " " + frame.methodInfo.name + " " + (frame.ip - 1) + " " + OPCODES[op] + " " + stack.join(","));
switch (op) {
case 0x00: // nop
break;
case 0x01: // aconst_null
stack.push(null);
break;
case 0x02: // aconst_m1
stack.push(-1);
break;
case 0x03: // iconst_0
case 0x0b: // fconst_0
stack.push(0);
break;
case 0x0e: // dconst_0
stack.push2(0);
break;
case 0x04: // iconst_1
case 0x0c: // fconst_1
stack.push(1);
break;
case 0x0f: // dconst_1
stack.push2(1);
break;
case 0x05: // iconst_2
case 0x0d: // fconst_2
stack.push(2);
break;
case 0x06: // iconst_3
stack.push(3);
break;
case 0x07: // iconst_4
stack.push(4);
break;
case 0x08: // iconst_5
stack.push(5);
break;
case 0x09: // lconst_0
stack.push2(Long.fromInt(0));
break;
case 0x0a: // lconst_1
stack.push2(Long.fromInt(1));
break;
case 0x10: // bipush
stack.push(frame.read8signed());
break;
case 0x11: // sipush
stack.push(frame.read16signed());
break;
case 0x12: // ldc
case 0x13: // ldc_w
var idx = (op === 0x12) ? frame.read8() : frame.read16();
var constant = cp[idx];
if (constant.tag)
constant = resolve(op, idx);
stack.push(constant);
break;
case 0x14: // ldc2_w
var idx = frame.read16();
var constant = cp[idx];
if (constant.tag)
constant = resolve(op, idx);
stack.push2(constant);
break;
case 0x15: // iload
case 0x17: // fload
case 0x19: // aload
stack.push(frame.getLocal(frame.read8()));
break;
case 0x16: // lload
case 0x18: // dload
stack.push2(frame.getLocal(frame.read8()));
break;
case 0x1a: // iload_0
case 0x22: // fload_0
case 0x2a: // aload_0
stack.push(frame.getLocal(0));
break;
case 0x1b: // iload_1
case 0x23: // fload_1
case 0x2b: // aload_1
stack.push(frame.getLocal(1));
break;
case 0x1c: // iload_2
case 0x24: // fload_2
case 0x2c: // aload_2
stack.push(frame.getLocal(2));
break;
case 0x1d: // iload_3
case 0x25: // fload_3
case 0x2d: // aload_3
stack.push(frame.getLocal(3));
break;
case 0x1e: // lload_0
case 0x26: // dload_0
stack.push2(frame.getLocal(0));
break;
case 0x1f: // lload_1
case 0x27: // dload_1
stack.push2(frame.getLocal(1));
break;
case 0x20: // lload_2
case 0x28: // dload_2
stack.push2(frame.getLocal(2));
break;
case 0x21: // lload_3
case 0x29: // dload_3
stack.push2(frame.getLocal(3));
break;
case 0x2e: // iaload
case 0x30: // faload
case 0x32: // aaload
case 0x33: // baload
case 0x34: // caload
case 0x35: // saload
var idx = stack.pop();
var refArray = stack.pop();
if (!checkArrayAccess(refArray, idx))
break;
stack.push(refArray[idx]);
break;
case 0x2f: // laload
case 0x31: // daload
var idx = stack.pop();
var refArray = stack.pop();
if (!checkArrayAccess(refArray, idx))
break;
stack.push2(refArray[idx]);
break;
case 0x36: // istore
case 0x38: // fstore
case 0x3a: // astore
frame.setLocal(frame.read8(), stack.pop());
break;
case 0x37: // lstore
case 0x39: // dstore
frame.setLocal(frame.read8(), stack.pop2());
break;
case 0x3b: // istore_0
case 0x43: // fstore_0
case 0x4b: // astore_0
frame.setLocal(0, stack.pop());
break;
case 0x3c: // istore_1
case 0x44: // fstore_1
case 0x4c: // astore_1
frame.setLocal(1, stack.pop());
break;
case 0x3d: // istore_2
case 0x45: // fstore_2
case 0x4d: // astore_2
frame.setLocal(2, stack.pop());
break;
case 0x3e: // istore_3
case 0x46: // fstore_3
case 0x4e: // astore_3
frame.setLocal(3, stack.pop());
break;
case 0x3f: // lstore_0
case 0x47: // dstore_0
frame.setLocal(0, stack.pop2());
break;
case 0x40: // lstore_1
case 0x48: // dstore_1
frame.setLocal(1, stack.pop2());
break;
case 0x41: // lstore_2
case 0x49: // dstore_2
frame.setLocal(2, stack.pop2());
break;
case 0x42: // lstore_3
case 0x4a: // dstore_3
frame.setLocal(3, stack.pop2());
break;
case 0x4f: // iastore
case 0x51: // fastore
case 0x54: // bastore
case 0x55: // castore
case 0x56: // sastore
var val = stack.pop();
var idx = stack.pop();
var refArray = stack.pop();
if (!checkArrayAccess(refArray, idx))
break;
refArray[idx] = val;
break;
case 0x50: // lastore
case 0x52: // dastore
var val = stack.pop2();
var idx = stack.pop();
var refArray = stack.pop();
if (!checkArrayAccess(refArray, idx))
break;
refArray[idx] = val;
break;
case 0x53: // aastore
var val = stack.pop();
var idx = stack.pop();
var refArray = stack.pop();
if (!checkArrayAccess(refArray, idx))
break;
if (val && !val.class.isAssignableTo(refArray.class.elementClass)) {
ctx.raiseExceptionAndYield("java/lang/ArrayStoreException");
break;
}
refArray[idx] = val;
break;
case 0x57: // pop
stack.pop();
break;
case 0x58: // pop2
stack.pop2();
break;
case 0x59: // dup
var val = stack.pop();
stack.push(val);
stack.push(val);
break;
case 0x5a: // dup_x1
var a = stack.pop();
var b = stack.pop();
stack.push(a);
stack.push(b);
stack.push(a);
break;
case 0x5b: // dup_x2
var a = stack.pop();
var b = stack.pop();
var c = stack.pop();
stack.push(a);
stack.push(c);
stack.push(b);
stack.push(a);
break;
case 0x5c: // dup2
var a = stack.pop();
var b = stack.pop();
stack.push(b);
stack.push(a);
stack.push(b);
stack.push(a);
break;
case 0x5d: // dup2_x1
var a = stack.pop();
var b = stack.pop();
var c = stack.pop();
stack.push(b);
stack.push(a);
stack.push(c);
stack.push(b);
stack.push(a);
break;
case 0x5e: // dup2_x2
var a = stack.pop();
var b = stack.pop();
var c = stack.pop();
var d = stack.pop();
stack.push(b);
stack.push(a);
stack.push(d);
stack.push(c);
stack.push(b);
stack.push(a);
break;
case 0x5f: // swap
var a = stack.pop();
var b = stack.pop();
stack.push(a);
stack.push(b);
break;
case 0x84: // iinc
var idx = frame.read8();
var val = frame.read8signed();
frame.setLocal(idx, frame.getLocal(idx) + val);
break;
case 0x60: // iadd
stack.push((stack.pop() + stack.pop())|0);
break;
case 0x61: // ladd
stack.push2(stack.pop2().add(stack.pop2()));
break;
case 0x62: // fadd
stack.push(Math.fround(stack.pop() + stack.pop()));
break;
case 0x63: // dadd
stack.push2(stack.pop2() + stack.pop2());
break;
case 0x64: // isub
stack.push((- stack.pop() + stack.pop())|0);
break;
case 0x65: // lsub
stack.push2(stack.pop2().negate().add(stack.pop2()));
break;
case 0x66: // fsub
stack.push(Math.fround(- stack.pop() + stack.pop()));
break;
case 0x67: // dsub
stack.push2(- stack.pop2() + stack.pop2());
break;
case 0x68: // imul
stack.push(Math.imul(stack.pop(), stack.pop()));
break;
case 0x69: // lmul
stack.push2(stack.pop2().multiply(stack.pop2()));
break;
case 0x6a: // fmul
stack.push(Math.fround(stack.pop() * stack.pop()));
break;
case 0x6b: // dmul
stack.push2(stack.pop2() * stack.pop2());
break;
case 0x6c: // idiv
var b = stack.pop();
var a = stack.pop();
if (!b) {
ctx.raiseExceptionAndYield("java/lang/ArithmeticException", "/ by zero");
break;
}
stack.push((a === util.INT_MIN && b === -1) ? a : ((a / b)|0));
break;
case 0x6d: // ldiv
var b = stack.pop2();
var a = stack.pop2();
if (b.isZero()) {
ctx.raiseExceptionAndYield("java/lang/ArithmeticException", "/ by zero");
break;
}
stack.push2(a.div(b));
break;
case 0x6e: // fdiv
var b = stack.pop();
var a = stack.pop();
stack.push(Math.fround(a / b));
break;
case 0x6f: // ddiv
var b = stack.pop2();
var a = stack.pop2();
stack.push2(a / b);
break;
case 0x70: // irem
var b = stack.pop();
var a = stack.pop();
if (!b) {
ctx.raiseExceptionAndYield("java/lang/ArithmeticException", "/ by zero");
break;
}
stack.push(a % b);
break;
case 0x71: // lrem
var b = stack.pop2();
var a = stack.pop2();
if (b.isZero()) {
ctx.raiseExceptionAndYield("java/lang/ArithmeticException", "/ by zero");
break;
}
stack.push2(a.modulo(b));
break;
case 0x72: // frem
var b = stack.pop();
var a = stack.pop();
stack.push(Math.fround(a % b));
break;
case 0x73: // drem
var b = stack.pop2();
var a = stack.pop2();
stack.push2(a % b);
break;
case 0x74: // ineg
stack.push((- stack.pop())|0);
break;
case 0x75: // lneg
stack.push2(stack.pop2().negate());
break;
case 0x76: // fneg
stack.push(- stack.pop());
break;
case 0x77: // dneg
stack.push2(- stack.pop2());
break;
case 0x78: // ishl
var b = stack.pop();
var a = stack.pop();
stack.push(a << b);
break;
case 0x79: // lshl
var b = stack.pop();
var a = stack.pop2();
stack.push2(a.shiftLeft(b));
break;
case 0x7a: // ishr
var b = stack.pop();
var a = stack.pop();
stack.push(a >> b);
break;
case 0x7b: // lshr
var b = stack.pop();
var a = stack.pop2();
stack.push2(a.shiftRight(b));
break;
case 0x7c: // iushr
var b = stack.pop();
var a = stack.pop();
stack.push(a >>> b);
break;
case 0x7d: // lushr
var b = stack.pop();
var a = stack.pop2();
stack.push2(a.shiftRightUnsigned(b));
break;
case 0x7e: // iand
stack.push(stack.pop() & stack.pop());
break;
case 0x7f: // land
stack.push2(stack.pop2().and(stack.pop2()));
break;
case 0x80: // ior
stack.push(stack.pop() | stack.pop());
break;
case 0x81: // lor
stack.push2(stack.pop2().or(stack.pop2()));
break;
case 0x82: // ixor
stack.push(stack.pop() ^ stack.pop());
break;
case 0x83: // lxor
stack.push2(stack.pop2().xor(stack.pop2()));
break;
case 0x94: // lcmp
var b = stack.pop2();
var a = stack.pop2();
if (a.greaterThan(b)) {
stack.push(1);
} else if (a.lessThan(b)) {
stack.push(-1);
} else {
stack.push(0);
}
break;
case 0x95: // fcmpl
var b = stack.pop();
var a = stack.pop();
if (isNaN(a) || isNaN(b)) {
stack.push(-1);
} else if (a > b) {
stack.push(1);
} else if (a < b) {
stack.push(-1);
} else {
stack.push(0);
}
break;
case 0x96: // fcmpg
var b = stack.pop();
var a = stack.pop();
if (isNaN(a) || isNaN(b)) {
stack.push(1);
} else if (a > b) {
stack.push(1);
} else if (a < b) {
stack.push(-1);
} else {
stack.push(0);
}
break;
case 0x97: // dcmpl
var b = stack.pop2();
var a = stack.pop2();
if (isNaN(a) || isNaN(b)) {
stack.push(-1);
} else if (a > b) {
stack.push(1);
} else if (a < b) {
stack.push(-1);
} else {
stack.push(0);
}
break;
case 0x98: // dcmpg
var b = stack.pop2();
var a = stack.pop2();
if (isNaN(a) || isNaN(b)) {
stack.push(1);
} else if (a > b) {
stack.push(1);
} else if (a < b) {
stack.push(-1);
} else {
stack.push(0);
}
break;
case 0x99: // ifeq
var jmp = frame.ip - 1 + frame.read16signed();
frame.ip = stack.pop() === 0 ? jmp : frame.ip;
break;
case 0x9a: // ifne
var jmp = frame.ip - 1 + frame.read16signed();
frame.ip = stack.pop() !== 0 ? jmp : frame.ip;
break;
case 0x9b: // iflt
var jmp = frame.ip - 1 + frame.read16signed();
frame.ip = stack.pop() < 0 ? jmp : frame.ip;
break;
case 0x9c: // ifge
var jmp = frame.ip - 1 + frame.read16signed();
frame.ip = stack.pop() >= 0 ? jmp : frame.ip;
break;
case 0x9d: // ifgt
var jmp = frame.ip - 1 + frame.read16signed();
frame.ip = stack.pop() > 0 ? jmp : frame.ip;
break;
case 0x9e: // ifle
var jmp = frame.ip - 1 + frame.read16signed();
frame.ip = stack.pop() <= 0 ? jmp : frame.ip;
break;
case 0x9f: // if_icmpeq
var jmp = frame.ip - 1 + frame.read16signed();
frame.ip = stack.pop() === stack.pop() ? jmp : frame.ip;
break;
case 0xa0: // if_cmpne
var jmp = frame.ip - 1 + frame.read16signed();
frame.ip = stack.pop() !== stack.pop() ? jmp : frame.ip;
break;
case 0xa1: // if_icmplt
var jmp = frame.ip - 1 + frame.read16signed();
frame.ip = stack.pop() > stack.pop() ? jmp : frame.ip;
break;
case 0xa2: // if_icmpge
var jmp = frame.ip - 1 + frame.read16signed();
frame.ip = stack.pop() <= stack.pop() ? jmp : frame.ip;
break;
case 0xa3: // if_icmpgt
var jmp = frame.ip - 1 + frame.read16signed();
frame.ip = stack.pop() < stack.pop() ? jmp : frame.ip;
break;
case 0xa4: // if_icmple
var jmp = frame.ip - 1 + frame.read16signed();
frame.ip = stack.pop() >= stack.pop() ? jmp : frame.ip;
break;
case 0xa5: // if_acmpeq
var jmp = frame.ip - 1 + frame.read16signed();
frame.ip = stack.pop() === stack.pop() ? jmp : frame.ip;
break;
case 0xa6: // if_acmpne
var jmp = frame.ip - 1 + frame.read16signed();
frame.ip = stack.pop() !== stack.pop() ? jmp : frame.ip;
break;
case 0xc6: // ifnull
var jmp = frame.ip - 1 + frame.read16signed();
frame.ip = !stack.pop() ? jmp : frame.ip;
break;
case 0xc7: // ifnonnull
var jmp = frame.ip - 1 + frame.read16signed();
frame.ip = stack.pop() ? jmp : frame.ip;
break;
case 0xa7: // goto
frame.ip += frame.read16signed() - 1;
break;
case 0xc8: // goto_w
frame.ip += frame.read32signed() - 1;
break;
case 0xa8: // jsr
var jmp = frame.read16();
stack.push(frame.ip);
frame.ip = jmp;
break;
case 0xc9: // jsr_w
var jmp = frame.read32();
stack.push(frame.ip);
frame.ip = jmp;
break;
case 0xa9: // ret
frame.ip = frame.getLocal(frame.read8());
break;
case 0x85: // i2l
stack.push2(Long.fromInt(stack.pop()));
break;
case 0x86: // i2f
break;
case 0x87: // i2d
stack.push2(stack.pop());
break;
case 0x88: // l2i
stack.push(stack.pop2().toInt());
break;
case 0x89: // l2f
stack.push(Math.fround(stack.pop2().toNumber()));
break;
case 0x8a: // l2d
stack.push2(stack.pop2().toNumber());
break;
case 0x8b: // f2i
stack.push(util.double2int(stack.pop()));
break;
case 0x8c: // f2l
stack.push2(Long.fromNumber(stack.pop()));
break;
case 0x8d: // f2d
stack.push2(stack.pop());
break;
case 0x8e: // d2i
stack.push(util.double2int(stack.pop2()));
break;
case 0x8f: // d2l
stack.push2(util.double2long(stack.pop2()));
break;
case 0x90: // d2f
stack.push(Math.fround(stack.pop2()));
break;
case 0x91: // i2b
stack.push((stack.pop() << 24) >> 24);
break;
case 0x92: // i2c
stack.push(stack.pop() & 0xffff);
break;
case 0x93: // i2s
stack.push((stack.pop() << 16) >> 16);
break;
case 0xaa: // tableswitch
var startip = frame.ip;
while ((frame.ip & 3) != 0)
frame.ip++;
var def = frame.read32signed();
var low = frame.read32signed();
var high = frame.read32signed();
var val = stack.pop();
var jmp;
if (val < low || val > high) {
jmp = def;
} else {
frame.ip += (val - low) << 2;
jmp = frame.read32signed();
}
frame.ip = startip - 1 + jmp;
break;
case 0xab: // lookupswitch
var startip = frame.ip;
while ((frame.ip & 3) != 0)
frame.ip++;
var jmp = frame.read32signed();
var size = frame.read32();
var val = frame.stack.pop();
lookup:
for (var i=0; i<size; i++) {
var key = frame.read32signed();
var offset = frame.read32signed();
if (key === val) {
jmp = offset;
}
if (key >= val) {
break lookup;
}
}
frame.ip = startip - 1 + jmp;
break;
case 0xbc: // newarray
var type = frame.read8();
var size = stack.pop();
if (size < 0) {
ctx.raiseExceptionAndYield("java/lang/NegativeArraySizeException", size);
break;
}
stack.push(ctx.newPrimitiveArray("????ZCFDBSIJ"[type], size));
break;
case 0xbd: // anewarray
var idx = frame.read16();
var classInfo = cp[idx];
if (classInfo.tag)
classInfo = resolve(op, idx);
var size = stack.pop();
if (size < 0) {
ctx.raiseExceptionAndYield("java/lang/NegativeArraySizeException", size);
break;
}
var className = classInfo.className;
if (className[0] !== "[")
className = "L" + className + ";";
className = "[" + className;
stack.push(ctx.newArray(className, size));
break;
case 0xc5: // multianewarray
var idx = frame.read16();
var classInfo = cp[idx];
if (classInfo.tag)
classInfo = resolve(op, idx);
var dimensions = frame.read8();
var lengths = new Array(dimensions);
for (var i=0; i<dimensions; i++)
lengths[i] = stack.pop();
stack.push(ctx.newMultiArray(classInfo.className, lengths.reverse()));
break;
case 0xbe: // arraylength
var obj = stack.pop();
if (!obj) {
ctx.raiseExceptionAndYield("java/lang/NullPointerException");
break;
}
stack.push(obj.length);
break;
case 0xb4: // getfield
var idx = frame.read16();
var field = cp[idx];
if (field.tag)
field = resolve(op, idx);
var obj = stack.pop();
if (!obj) {
ctx.raiseExceptionAndYield("java/lang/NullPointerException");
break;
}
stack.pushType(field.signature, field.get(obj));
break;
case 0xb5: // putfield
var idx = frame.read16();
var field = cp[idx];
if (field.tag)
field = resolve(op, idx);
var val = stack.popType(field.signature);
var obj = stack.pop();
if (!obj) {
ctx.raiseExceptionAndYield("java/lang/NullPointerException");
break;
}
field.set(obj, val);
break;
case 0xb2: // getstatic
var idx = frame.read16();
var field = cp[idx];
if (field.tag)
field = resolve(op, idx);
classInitCheck(field.classInfo, frame.ip-3);
var value = ctx.runtime.getStatic(field);
if (typeof value === "undefined") {
value = util.defaultValue(field.signature);
}
stack.pushType(field.signature, value);
break;
case 0xb3: // putstatic
var idx = frame.read16();
var field = cp[idx];
if (field.tag)
field = resolve(op, idx);
classInitCheck(field.classInfo, frame.ip-3);
ctx.runtime.setStatic(field, stack.popType(field.signature));
break;
case 0xbb: // new
var idx = frame.read16();
var classInfo = cp[idx];
if (classInfo.tag)
classInfo = resolve(op, idx);
classInitCheck(classInfo, frame.ip-3);
stack.push(ctx.newObject(classInfo));
break;
case 0xc0: // checkcast
var idx = frame.read16();
var classInfo = cp[idx];
if (classInfo.tag)
classInfo = resolve(op, idx);
var obj = stack[stack.length - 1];
if (obj) {
if (!obj.class.isAssignableTo(classInfo)) {
ctx.raiseExceptionAndYield("java/lang/ClassCastException",
obj.class.className + " is not assignable to " +
classInfo.className);
break;
}
}
break;
case 0xc1: // instanceof
var idx = frame.read16();
var classInfo = cp[idx];
if (classInfo.tag)
classInfo = resolve(op, idx);
var obj = stack.pop();
var result = !obj ? false : obj.class.isAssignableTo(classInfo);
stack.push(result ? 1 : 0);
break;
case 0xbf: // athrow
var obj = stack.pop();
if (!obj) {
ctx.raiseExceptionAndYield("java/lang/NullPointerException");
break;
}
throw_(obj, ctx);
break;
case 0xc2: // monitorenter
var obj = stack.pop();
if (!obj) {
ctx.raiseExceptionAndYield("java/lang/NullPointerException");
break;
}
ctx.monitorEnter(obj);
break;
case 0xc3: // monitorexit
var obj = stack.pop();
if (!obj) {
ctx.raiseExceptionAndYield("java/lang/NullPointerException");
break;
}
ctx.monitorExit(obj);
break;
case 0xc4: // wide
switch (op = frame.read8()) {
case 0x15: // iload
case 0x17: // fload
case 0x19: // aload
stack.push(frame.getLocal(frame.read16()));
break;
case 0x16: // lload
case 0x18: // dload
stack.push2(frame.getLocal(frame.read16()));
break;
case 0x36: // istore
case 0x38: // fstore
case 0x3a: // astore
frame.setLocal(frame.read16(), stack.pop());
break;
case 0x37: // lstore
case 0x39: // dstore
frame.setLocal(frame.read16(), stack.pop2());
break;