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| /* | |
| * 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); | |
| } | |
| }); | |