From 8f9a84345c147da5d398331548753d1e350ce846 Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Sun, 24 Oct 2021 12:04:06 +0200
Subject: Add globals and OP_DEF operation

---
 src/bytecode/vm.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'src/bytecode/vm.h')

diff --git a/src/bytecode/vm.h b/src/bytecode/vm.h
index f1886ec..23370bb 100755
--- a/src/bytecode/vm.h
+++ b/src/bytecode/vm.h
@@ -6,6 +6,7 @@
 #include "chunk.h"
 #include "ops.h"
 #include "debug.h"
+#include "hashtable.h"
 
 #define VM_STACK_CAP 1024
 
@@ -16,6 +17,8 @@ typedef struct VM {
     u8 *pc;
     // Stack.
     Object *stack;
+    // Global variables.
+    HashTable *globals;
 } VM;
 
 void vm_init(VM *vm);
@@ -27,11 +30,13 @@ void
 vm_init(VM *vm) {
     *vm = (VM){0};
     array_init(vm->stack, VM_STACK_CAP);
+    vm->globals = ht_init();
 }
 
 void
 vm_free(VM *vm) {
     array_free(vm->stack);
+    ht_free(vm->globals);
 }
 
 void
@@ -142,6 +147,11 @@ vm_interpret(VM *vm, Chunk *chunk) {
                 Object obj = vm->chunk->constants[constant];
                 array_push(vm->stack, obj);
             } break;
+            case OP_DEF: {
+                Object value = array_pop(vm->stack);
+                Object name = array_pop(vm->stack);
+                ht_insert(vm->globals, name, value);
+            } break;
             case OP_SUM: { FIXNUM_ARITHMETIC_OP(+); } break;
             case OP_SUB: { FIXNUM_ARITHMETIC_OP(-); } break;
             case OP_MUL: { FIXNUM_ARITHMETIC_OP(*); } break;
-- 
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