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05.awk
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05.awk
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function load(file, saved_rs, word) {
saved_rs=RS
RS=",";
while ((getline word <file) > 0) {
mem[i++] = word
}
RS=saved_rs
}
function fetch(insn, n, i, mode) {
mode = insn / 100;
for (i = 1; i < n; i++)
mode /= 10;
mode = int(mode) % 10;
switch (mode) {
case 0: # load
return mem[mem[pc + n]];
case 1: # immediate
return mem[pc + n];
default:
print("Unknown parameter mode %d at %d\n", mode, pc);
exit(1);
}
}
BEGIN {
load(program);
for (pc = 0; mem[pc] != 99;) {
insn = sprintf("%05u", mem[pc]);
switch (insn % 100) {
case 1: # add op1 op2 [dst]
op1 = fetch(insn, 1);
op2 = fetch(insn, 2);
mem[mem[pc + 3]] = op1 + op2;
pc += 4;
break;
case 2: # mul op1 op2 [dst]
op1 = fetch(insn, 1);
op2 = fetch(insn, 2);
mem[mem[pc + 3]] = op1 * op2;
pc += 4;
break;
case 3: # inword [op1]
getline op1
mem[mem[pc + 1]] = int(op1);
pc += 2;
break;
case 4: # outword op1
op1 = fetch(insn, 1);
print op1; fflush();
pc += 2;
break;
case 5: # bnz op1 op2
op1 = fetch(insn, 1);
op2 = fetch(insn, 2);
if (op1 != 0)
pc = op2;
else
pc += 3;
break;
case 6: # bz op1 op2
op1 = fetch(insn, 1);
op2 = fetch(insn, 2);
if (op1 == 0)
pc = op2;
else
pc += 3;
break;
case 7: # setlt op1 op2 [dst]
op1 = fetch(insn, 1);
op2 = fetch(insn, 2);
mem[mem[pc + 3]] = op1 < op2 ? 1 : 0;
pc += 4;
break;
case 8: # seteq op1 op2 [dst]
op1 = fetch(insn, 1);
op2 = fetch(insn, 2);
mem[mem[pc + 3]] = op1 == op2 ? 1 : 0;
pc += 4;
break;
default:
printf("Illegal instruction %d at %d\n", insn, pc);
exit 1;
}
}
exit 0;
}