Added simple and mostly wrong c0vm

src/c0vm.js

@@ -0,0 +1,132 @@
+stack = []
+pc = 0;
+program = [];
+variables = [];
+
+// Takes in a parsed .bc0 file and runs it
+function execute(file) {
+    console.log("Beginning execution of file " + file);
+    main_function = file.function_pool[0];
+    program = main_function.code;
+    for (var i = 0; i < main_function.num_vars; i++)
+        variables.push(0);
+    while (true) {
+        console.log("Running opcode " + program[pc].toString(16));
+        switch (program[pc]) {
+            // Stack manipulation
+        case POP:
+            pc++;
+            stack.pop();
+            break;
+        case DUP:
+            pc++;
+            var v = stack.pop();
+            stack.push(v);
+            stack.push(v);
+            break;
+        case SWAP:
+            pc++;
+            var v1 = stack.pop();
+            var v2 = stack.pop();
+            stack.push(v1);
+            stack.push(v2);
+            break;
+        case BIPUSH:
+            pc += 2;
+            stack.push(program[pc-1]);
+            break;
+
+            // Returning from a function
+        case RETURN:
+            var retVal = stack.pop();
+            return retVal;
+
+            // Arithmetic
+        case IADD:
+            pc++;
+            var y = stack.pop();
+            var x = stack.pop();
+            stack.push((x+y) % 0xFF);
+            break;
+        case ISUB:
+            pc++;
+            var y = stack.pop();
+            var x = stack.pop();
+            stack.push((x-y) % 0xFF);
+            break;
+        case IMUL:
+            pc++;
+            var y = stack.pop();
+            var x = stack.pop();
+            stack.push((x*y) % 0xFF);
+            break;
+
+        default:
+            console.log("Error: Unknown opcode\n");
+            return;
+        }
+    }
+}
+
+exports.execute = execute;
+
+// opcode definitions
+
+/* arithmetic operations */
+IADD = 0x60;
+IAND = 0x7E;
+IDIV = 0x6C;
+IMUL = 0x68;
+IOR = 0x80;
+IREM = 0x70;
+ISHL = 0x78;
+ISHR = 0x7A;
+ISUB = 0x64;
+IXOR = 0x82;
+
+/* stack operations */
+DUP = 0x59;
+POP = 0x57;
+SWAP = 0x5F;
+
+/* memory allocation */
+NEWARRAY = 0xBC;
+ARRAYLENGTH = 0xBE;
+NEW = 0xBB;
+
+/* memory access */
+AADDF = 0x62;
+AADDS = 0x63;
+IMLOAD = 0x2E;
+AMLOAD = 0x2F;
+IMSTORE = 0x4E;
+AMSTORE = 0x4F;
+CMLOAD = 0x34;
+CMSTORE = 0x55;
+
+/* local variables */
+VLOAD = 0x15;
+VSTORE = 0x36;
+
+/* constants */
+ACONST_NULL = 0x01;
+BIPUSH = 0x10;
+ILDC = 0x13;
+ALDC = 0x14;
+
+/* control flow */
+NOP = 0x00;
+IF_CMPEQ = 0x9F;
+IF_CMPNE = 0xA0;
+IF_ICMPLT = 0xA1;
+IF_ICMPGE = 0xA2;
+IF_ICMPGT = 0xA3;
+IF_ICMPLE = 0xA4;
+GOTO = 0xA7;
+ATHROW = 0xBF;
+ASSERT = 0xCF;
+
+/* function calls and returns */
+INVOKESTATIC = 0xB8;
+INVOKENATIVE = 0xB7;
+RETURN = 0xB0

src/index.js

@@ -1,9 +1,13 @@
 parser = require("./bytecode-parser");
+c0vm = require("./c0vm.js");
 
-console.log("Reading in sample bytecode file:");
-console.log(parser.getBytes("../test/test.bc0"));
-console.log("That was the sample bytecode file" +
-            " -- it probably took up your whole terminal screen.");
-var file = parser.parse("../test/test.bc0");
-console.log(file);
-console.log(file.function_pool[0].code);
+// console.log("Reading in sample bytecode file:");
+// console.log(parser.getBytes("../test/test.bc0"));
+// console.log("That was the sample bytecode file" +
+//             " -- it probably took up your whole terminal screen.");
+// var file = parser.parse("../test/test.bc0");
+// console.log(file);
+// console.log(file.function_pool[0].code);
+
+var file = parser.parse("../test/iadd.c0.bc0");
+console.log("Result is " + c0vm.execute(file));