add true, false, nil keywords

1 files changed, 9 insertions, 1 deletions

diff --git a/vm.c b/vm.c
index 9f6ece6..205e0fd 100644
--- a/vm.c
+++ b/vm.c
@@ -46,10 +46,12 @@ Thread thread_new(State *S) {
 }
 
 
-void runvm(State *S) {
+int runvm(State *S) {
 	Thread *th = S->th;
 	Chunk *ch = th->ch;
 
+	int status = 1;
+
 	disasm_chunk(ch);
 
 #define RBYTE() (ch->bc.d[th->ip++])
@@ -63,6 +65,7 @@ void runvm(State *S) {
 		uint8_t instr = RBYTE();
 		switch (instr) {
 		case OP_RET:
+			status  = 0;
 			printf("done!\n");
 			goto done;
 			break;
@@ -127,10 +130,15 @@ void runvm(State *S) {
 			ARITH_OP(OP_DIV, /)
 #undef ARITH_OP
 
+		case OP_NIL: PUSH(VAL_NIL); break;
+		case OP_TRUE: PUSH(VAL_TRUE); break;
+		case OP_FALSE: PUSH(VAL_FALSE); break;
+
 
 		}
 	}
 	done:;
+	return status;
 }