【发布时间】：2014-04-25 00:25:57
【问题描述】：
这是下面的 javascript 代码，其中链接了一些匿名内部函数，似乎每个开关都有 2 个数组索引，它们似乎也返回了一些值，但我不知道它们在哪里返回到 memoryReadJumpCompile() 函数或这两个数组索引。
他们很可能会返回到实际的数组索引，并且通过函数名 Compile 似乎每次调用这些数组索引中的任何一个时，他们都会重新评估链接到它们的函数，结果仍然不知道在哪里如果实际索引的保持函数，结果将被存储，我最好的猜测是实际的数组索引就像函数名，它们由另一段代码返回——无论索引在代码中的某处被调用，但让我们说前 2 个例子数组索引。
this.memoryHighReader[0] = this.memoryReader[0xFF00]
所以它们都变成了同一个东西，我发现它在指令执行器中像这样处理
case 242:
a.registerA = a.memoryHighReader[a.registerC](a, a.registerC);
break;
GameBoyCore.prototype.memoryReadJumpCompile = function () {
//...
else if (index >= 0xFF00) {
switch (index) {
case 0xFF00:
//JOYPAD:
this.memoryHighReader[0] = this.memoryReader[0xFF00] = function (parentObj, address) {
return 0xC0 | parentObj.memory[0xFF00]; //Top nibble returns as set.
}
break;
case 0xFF01:
//SB
this.memoryHighReader[0x01] = this.memoryReader[0xFF01] = function (parentObj, address) {
return (parentObj.memory[0xFF02] < 0x80) ? parentObj.memory[0xFF01] : 0xFF;
}
break;
case 0xFF02:
//SC
if (this.cGBC) {
this.memoryHighReader[0x02] = this.memoryReader[0xFF02] = function (parentObj, address) {
return ((parentObj.serialTimer <= 0) ? 0x7C : 0xFC) | parentObj.memory[0xFF02];
}
}
else {
this.memoryHighReader[0x02] = this.memoryReader[0xFF02] = function (parentObj, address) {
return ((parentObj.serialTimer <= 0) ? 0x7E : 0xFE) | parentObj.memory[0xFF02];
}
}
break;
}
}
上面的 javascript 几乎像 Java，但我不明白如何在 memoryReadJumpCompile 中转换 function(parentObj, address) {...}，这是在不使用接口的情况下将其转换为 Java 的最简单方法。我想使用switch()
这是我目前在 Java 中的内容（它不使用十六进制字母，因为我在开始转换时使用了缩小的 JavaScript 版本）
public void memoryReadJumpCompile() {
for (var a = 0; a <= 65535; a++) {
if (a < 16384) {
this.memoryReader[a] = this.memoryReadNormal;
} else {
if (a < 32768) {
this.memoryReader[a] = this.memoryReadROM;
} else {
if (a < 38912) {
this.memoryReader[a] = (this.cGBC) ? this.VRAMDATAReadCGBCPU : this.VRAMDATAReadDMGCPU;
} else {
if (a < 40960) {
this.memoryReader[a] = (this.cGBC) ? this.VRAMCHRReadCGBCPU : this.VRAMCHRReadDMGCPU;
} else {
if (a >= 40960 && a < 49152) {
if ((this.numRAMBanks == 1 / 16 && a < 41472) || this.numRAMBanks >= 1) {
if (this.cMBC7) {
this.memoryReader[a] = this.memoryReadMBC7;
} else {
if (!this.cMBC3) {
this.memoryReader[a] = this.memoryReadMBC;
} else {
this.memoryReader[a] = this.memoryReadMBC3;
}
}
} else {
this.memoryReader[a] = this.memoryReadBAD;
}
} else {
if (a >= 49152 && a < 57344) {
if (!this.cGBC || a < 53248) {
this.memoryReader[a] = this.memoryReadNormal;
} else {
this.memoryReader[a] = this.memoryReadGBCMemory;
}
} else {
if (a >= 57344 && a < 65024) {
if (!this.cGBC || a < 61440) {
this.memoryReader[a] = this.memoryReadECHONormal;
} else {
this.memoryReader[a] = this.memoryReadECHOGBCMemory;
}
} else {
if (a < 65184) {
this.memoryReader[a] = this.memoryReadOAM;
} else {
if (this.cGBC && a >= 65184 && a < 65280) {
this.memoryReader[a] = this.memoryReadNormal;
} else {
if (a >= 65280) {
switch (a) {
case 65280:
this.memoryHighReader[0] = this.memoryReader[65280] = function(c, b) {
return 192 | c.memory[65280];
};
break;
case 65281:
this.memoryHighReader[1] = this.memoryReader[65281] = function(c, b) {
return (c.memory[65282] < 128) ? c.memory[65281] : 255;
};
break;
case 65282:
if (this.cGBC) {
this.memoryHighReader[2] = this.memoryReader[65282] = function(c, b) {
return ((c.serialTimer <= 0) ? 124 : 252) | c.memory[65282];
}
} else {
this.memoryHighReader[2] = this.memoryReader[65282] = function(c, b) {
return ((c.serialTimer <= 0) ? 126 : 254) | c.memory[65282];
}
}
break;
case 65283:
this.memoryHighReader[3] = this.memoryReader[65283] = this.memoryReadBAD;
break;
case 65284:
this.memoryHighReader[4] = this.memoryReader[65284] = function(c, b) {
c.memory[65284] = (c.memory[65284] + (c.DIVTicks >> 8)) & 255;
c.DIVTicks &= 255;
return c.memory[65284];
};
break;
case 65285:
case 65286:
this.memoryHighReader[a & 255] = this.memoryHighReadNormal;
this.memoryReader[a] = this.memoryReadNormal;
break;
case 65287:
this.memoryHighReader[7] = this.memoryReader[65287] = function(c, b) {
return 248 | c.memory[65287];
};
break;
case 65288:
case 65289:
case 65290:
case 65291:
case 65292:
case 65293:
case 65294:
this.memoryHighReader[a & 255] = this.memoryReader[a] = this.memoryReadBAD;
break;
case 65295:
this.memoryHighReader[15] = this.memoryReader[65295] = function(c, b) {
return 224 | c.interruptsRequested;
};
break;
case 65296:
this.memoryHighReader[16] = this.memoryReader[65296] = function(c, b) {
return 128 | c.memory[65296];
};
break;
case 65297:
this.memoryHighReader[17] = this.memoryReader[65297] = function(c, b) {
return 63 | c.memory[65297];
};
break;
case 65298:
this.memoryHighReader[18] = this.memoryHighReadNormal;
this.memoryReader[65298] = this.memoryReadNormal;
break;
case 65299:
this.memoryHighReader[19] = this.memoryReader[65299] = this.memoryReadBAD;
break;
case 65300:
this.memoryHighReader[20] = this.memoryReader[65300] = function(c, b) {
return 191 | c.memory[65300];
};
break;
case 65301:
this.memoryHighReader[21] = this.memoryReadBAD;
this.memoryReader[65301] = this.memoryReadBAD;
break;
case 65302:
this.memoryHighReader[22] = this.memoryReader[65302] = function(c, b) {
return 63 | c.memory[65302];
};
break;
case 65303:
this.memoryHighReader[23] = this.memoryHighReadNormal;
this.memoryReader[65303] = this.memoryReadNormal;
break;
case 65304:
this.memoryHighReader[24] = this.memoryReader[65304] = this.memoryReadBAD;
break;
case 65305:
this.memoryHighReader[25] = this.memoryReader[65305] = function(c, b) {
return 191 | c.memory[65305];
};
break;
case 65306:
this.memoryHighReader[26] = this.memoryReader[65306] = function(c, b) {
return 127 | c.memory[65306];
};
break;
case 65307:
this.memoryHighReader[27] = this.memoryReader[65307] = this.memoryReadBAD;
break;
case 65308:
this.memoryHighReader[28] = this.memoryReader[65308] = function(c, b) {
return 159 | c.memory[65308];
};
break;
case 65309:
this.memoryHighReader[29] = this.memoryReader[65309] = this.memoryReadBAD;
break;
case 65310:
this.memoryHighReader[30] = this.memoryReader[65310] = function(c, b) {
return 191 | c.memory[65310];
};
break;
case 65311:
case 65312:
this.memoryHighReader[a & 255] = this.memoryReader[a] = this.memoryReadBAD;
break;
case 65313:
case 65314:
this.memoryHighReader[a & 255] = this.memoryHighReadNormal;
this.memoryReader[a] = this.memoryReadNormal;
break;
case 65315:
this.memoryHighReader[35] = this.memoryReader[65315] = function(c, b) {
return 191 | c.memory[65315];
};
break;
case 65316:
case 65317:
this.memoryHighReader[a & 255] = this.memoryHighReadNormal;
this.memoryReader[a] = this.memoryReadNormal;
break;
case 65318:
this.memoryHighReader[38] = this.memoryReader[65318] = function(c, b) {
c.audioJIT();
return 112 | c.memory[65318];
};
break;
case 65319:
case 65320:
case 65321:
case 65322:
case 65323:
case 65324:
case 65325:
case 65326:
case 65327:
this.memoryHighReader[a & 255] = this.memoryReader[a] = this.memoryReadBAD;
break;
case 65328:
case 65329:
case 65330:
case 65331:
case 65332:
case 65333:
case 65334:
case 65335:
case 65336:
case 65337:
case 65338:
case 65339:
case 65340:
case 65341:
case 65342:
case 65343:
this.memoryReader[a] = function(c, b) {
return (c.channel3canPlay) ? c.memory[65280 | (c.channel3lastSampleLookup >> 1)] : c.memory[b];
};
this.memoryHighReader[a & 255] = function(c, b) {
return (c.channel3canPlay) ? c.memory[65280 | (c.channel3lastSampleLookup >> 1)] : c.memory[65280 | b];
};
break;
case 65344:
this.memoryHighReader[64] = this.memoryHighReadNormal;
this.memoryReader[65344] = this.memoryReadNormal;
break;
case 65345:
this.memoryHighReader[65] = this.memoryReader[65345] = function(c, b) {
return 128 | c.memory[65345] | c.modeSTAT;
};
break;
case 65346:
this.memoryHighReader[66] = this.memoryReader[65346] = function(c, b) {
return c.backgroundY;
};
break;
case 65347:
this.memoryHighReader[67] = this.memoryReader[65347] = function(c, b) {
return c.backgroundX;
};
break;
case 65348:
this.memoryHighReader[68] = this.memoryReader[65348] = function(c, b) {
return ((c.LCDisOn) ? c.memory[65348] : 0);
};
break;
case 65349:
case 65350:
case 65351:
case 65352:
case 65353:
this.memoryHighReader[a & 255] = this.memoryHighReadNormal;
this.memoryReader[a] = this.memoryReadNormal;
break;
case 65354:
this.memoryHighReader[74] = this.memoryReader[65354] = function(c, b) {
return c.windowY;
};
break;
case 65355:
this.memoryHighReader[75] = this.memoryHighReadNormal;
this.memoryReader[65355] = this.memoryReadNormal;
break;
case 65356:
this.memoryHighReader[76] = this.memoryReader[65356] = this.memoryReadBAD;
break;
case 65357:
this.memoryHighReader[77] = this.memoryHighReadNormal;
this.memoryReader[65357] = this.memoryReadNormal;
break;
case 65358:
this.memoryHighReader[78] = this.memoryReader[65358] = this.memoryReadBAD;
break;
case 65359:
this.memoryHighReader[79] = this.memoryReader[65359] = function(c, b) {
return c.currVRAMBank;
};
break;
case 65360:
case 65361:
case 65362:
case 65363:
case 65364:
this.memoryHighReader[a & 255] = this.memoryHighReadNormal;
this.memoryReader[a] = this.memoryReadNormal;
break;
case 65365:
if (this.cGBC) {
this.memoryHighReader[85] = this.memoryReader[65365] = function(c, b) {
if (!c.LCDisOn && c.hdmaRunning) {
c.DMAWrite((c.memory[65365] & 127) + 1);
c.memory[65365] = 255;
c.hdmaRunning = false;
}
return c.memory[65365];
}
} else {
this.memoryReader[65365] = this.memoryReadNormal;
this.memoryHighReader[85] = this.memoryHighReadNormal;
}
break;
case 65366:
if (this.cGBC) {
this.memoryHighReader[86] = this.memoryReader[65366] = function(c, b) {
return 60 | ((c.memory[65366] >= 192) ? (2 | (c.memory[65366] & 193)) : (c.memory[65366] & 195));
}
} else {
this.memoryReader[65366] = this.memoryReadNormal;
this.memoryHighReader[86] = this.memoryHighReadNormal;
}
break;
case 65367:
case 65368:
case 65369:
case 65370:
case 65371:
case 65372:
case 65373:
case 65374:
case 65375:
case 65376:
case 65377:
case 65378:
case 65379:
case 65380:
case 65381:
case 65382:
case 65383:
this.memoryHighReader[a & 255] = this.memoryReader[a] = this.memoryReadBAD;
break;
case 65384:
case 65385:
case 65386:
case 65387:
this.memoryHighReader[a & 255] = this.memoryHighReadNormal;
this.memoryReader[a] = this.memoryReadNormal;
break;
case 65388:
if (this.cGBC) {
this.memoryHighReader[108] = this.memoryReader[65388] = function(c, b) {
return 254 | c.memory[65388];
}
} else {
this.memoryHighReader[108] = this.memoryReader[65388] = this.memoryReadBAD;
}
break;
case 65389:
case 65390:
case 65391:
this.memoryHighReader[a & 255] = this.memoryReader[a] = this.memoryReadBAD;
break;
case 65392:
if (this.cGBC) {
this.memoryHighReader[112] = this.memoryReader[65392] = function(c, b) {
return 64 | c.memory[65392];
}
} else {
this.memoryHighReader[112] = this.memoryReader[65392] = this.memoryReadBAD;
}
break;
case 65393:
this.memoryHighReader[113] = this.memoryReader[65393] = this.memoryReadBAD;
break;
case 65394:
case 65395:
this.memoryHighReader[a & 255] = this.memoryReader[a] = this.memoryReadNormal;
break;
case 65396:
if (this.cGBC) {
this.memoryHighReader[116] = this.memoryReader[65396] = this.memoryReadNormal;
} else {
this.memoryHighReader[116] = this.memoryReader[65396] = this.memoryReadBAD;
}
break;
case 65397:
this.memoryHighReader[117] = this.memoryReader[65397] = function(c, b) {
return 143 | c.memory[65397];
};
break;
case 65398:
case 65399:
this.memoryHighReader[a & 255] = this.memoryReader[a] = function(c, b) {
return 0;
};
break;
case 65400:
case 65401:
case 65402:
case 65403:
case 65404:
case 65405:
case 65406:
case 65407:
this.memoryHighReader[a & 255] = this.memoryReader[a] = this.memoryReadBAD;
break;
case 65535:
this.memoryHighReader[255] = this.memoryReader[65535] = function(c, b) {
return c.interruptsEnabled;
};
break;
default:
this.memoryReader[a] = this.memoryReadNormal;
this.memoryHighReader[a & 255] = this.memoryHighReadNormal;
}
} else {
this.memoryReader[a] = this.memoryReadBAD;
}
}
}
}
}
}
}
}
}
}
}
}
【问题讨论】：
标签： java javascript arrays variables anonymous-function