Spaces:
Running
Running
File size: 7,783 Bytes
8f3f8db |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 |
"use strict";
/*
* Copyright (c) 2013-2025 Vanessa Freudenberg
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
Object.subclass('Squeak.InstructionStream',
'initialization', {
initialize: function(method, vm) {
this.vm = vm;
this.method = method;
this.pc = 0;
this.specialConstants = [vm.trueObj, vm.falseObj, vm.nilObj, -1, 0, 1, 2];
},
},
'decoding', {
interpretNextInstructionFor: function(client) {
// Send to the argument, client, a message that specifies the type of the next instruction.
var method = this.method;
var byte = method.bytes[this.pc++];
var type = (byte / 16) | 0;
var offset = byte % 16;
if (type === 0) return client.pushReceiverVariable(offset);
if (type === 1) return client.pushTemporaryVariable(offset);
if (type === 2) return client.pushConstant(method.methodGetLiteral(offset));
if (type === 3) return client.pushConstant(method.methodGetLiteral(offset + 16));
if (type === 4) return client.pushLiteralVariable(method.methodGetLiteral(offset));
if (type === 5) return client.pushLiteralVariable(method.methodGetLiteral(offset + 16));
if (type === 6)
if (offset<8) return client.popIntoReceiverVariable(offset)
else return client.popIntoTemporaryVariable(offset-8);
if (type === 7) {
if (offset===0) return client.pushReceiver()
if (offset < 8) return client.pushConstant(this.specialConstants[offset - 1])
if (offset===8) return client.methodReturnReceiver();
if (offset < 12) return client.methodReturnConstant(this.specialConstants[offset - 9]);
if (offset===12) return client.methodReturnTop();
if (offset===13) return client.blockReturnTop();
if (offset > 13) throw Error("unusedBytecode");
}
if (type === 8) return this.interpretExtension(offset, method, client);
if (type === 9) // short jumps
if (offset<8) return client.jump(offset+1);
else return client.jumpIf(false, offset-8+1);
if (type === 10) {// long jumps
byte = this.method.bytes[this.pc++];
if (offset<8) return client.jump((offset-4)*256 + byte);
else return client.jumpIf(offset<12, (offset & 3)*256 + byte);
}
if (type === 11)
return client.send(this.vm.specialSelectors[2 * offset],
this.vm.specialSelectors[2 * offset + 1],
false);
if (type === 12)
return client.send(this.vm.specialSelectors[2 * (offset + 16)],
this.vm.specialSelectors[2 * (offset + 16) + 1],
false);
if (type > 12)
return client.send(method.methodGetLiteral(offset), type-13, false);
},
interpretExtension: function(offset, method, client) {
if (offset <= 6) { // Extended op codes 128-134
var byte2 = this.method.bytes[this.pc++];
if (offset <= 2) { // 128-130: extended pushes and pops
var type = byte2 / 64 | 0;
var offset2 = byte2 % 64;
if (offset === 0) {
if (type === 0) return client.pushReceiverVariable(offset2);
if (type === 1) return client.pushTemporaryVariable(offset2);
if (type === 2) return client.pushConstant(this.method.methodGetLiteral(offset2));
if (type === 3) return client.pushLiteralVariable(this.method.methodGetLiteral(offset2));
}
if (offset === 1) {
if (type === 0) return client.storeIntoReceiverVariable(offset2);
if (type === 1) return client.storeIntoTemporaryVariable(offset2);
if (type === 2) throw Error("illegalStore");
if (type === 3) return client.storeIntoLiteralVariable(this.method.methodGetLiteral(offset2));
}
if (offset === 2) {
if (type === 0) return client.popIntoReceiverVariable(offset2);
if (type === 1) return client.popIntoTemporaryVariable(offset2);
if (type === 2) throw Error("illegalStore");
if (type === 3) return client.popIntoLiteralVariable(this.method.methodGetLiteral(offset2));
}
}
// 131-134 (extended sends)
if (offset === 3) // Single extended send
return client.send(this.method.methodGetLiteral(byte2 % 32), byte2 / 32 | 0, false);
if (offset === 4) { // Double extended do-anything
var byte3 = this.method.bytes[this.pc++];
var type = byte2 / 32 | 0;
if (type === 0) return client.send(this.method.methodGetLiteral(byte3), byte2 % 32, false);
if (type === 1) return client.send(this.method.methodGetLiteral(byte3), byte2 % 32, true);
if (type === 2) return client.pushReceiverVariable(byte3);
if (type === 3) return client.pushConstant(this.method.methodGetLiteral(byte3));
if (type === 4) return client.pushLiteralVariable(this.method.methodGetLiteral(byte3));
if (type === 5) return client.storeIntoReceiverVariable(byte3);
if (type === 6) return client.popIntoReceiverVariable(byte3);
if (type === 7) return client.storeIntoLiteralVariable(this.method.methodGetLiteral(byte3));
}
if (offset === 5) // Single extended send to super
return client.send(this.method.methodGetLiteral(byte2 & 31), byte2 >> 5, true);
if (offset === 6) // Second extended send
return client.send(this.method.methodGetLiteral(byte2 & 63), byte2 >> 6, false);
}
if (offset === 7) return client.doPop();
if (offset === 8) return client.doDup();
if (offset === 9) return client.pushActiveContext();
// closures
var byte2 = this.method.bytes[this.pc++];
if (offset === 10)
return byte2 < 128 ? client.pushNewArray(byte2) : client.popIntoNewArray(byte2 - 128);
var byte3 = this.method.bytes[this.pc++];
if (offset === 11) return client.callPrimitive(byte2 + 256 * byte3);
if (offset === 12) return client.pushRemoteTemp(byte2, byte3);
if (offset === 13) return client.storeIntoRemoteTemp(byte2, byte3);
if (offset === 14) return client.popIntoRemoteTemp(byte2, byte3);
// offset === 15
var byte4 = this.method.bytes[this.pc++];
return client.pushClosureCopy(byte2 >> 4, byte2 & 0xF, (byte3 * 256) + byte4);
}
});
|