"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); } });