From 634272f023a3123bc296690bc2dadd874b601ca9 Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Sun, 24 Oct 2021 12:24:29 +0200
Subject: Add OP_GET_GLOBAL and symbol resolution for globals

---
 src/bytecode/vm.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

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

diff --git a/src/bytecode/vm.h b/src/bytecode/vm.h
index 23370bb..de025c1 100755
--- a/src/bytecode/vm.h
+++ b/src/bytecode/vm.h
@@ -54,6 +54,14 @@ vm_reset(VM *vm) {
         .col = vm->chunk->lines[vm->pc - vm->chunk->code - 1].col, \
     })
 
+#define SYMBOL_NOT_FOUND_ERR() \
+    error_push((Error){ \
+        .type = ERR_TYPE_RUNTIME, \
+        .value = ERR_SYMBOL_NOT_FOUND, \
+        .line = vm->chunk->lines[vm->pc - vm->chunk->code - 1].line, \
+        .col = vm->chunk->lines[vm->pc - vm->chunk->code - 1].col, \
+    })
+
 #define FIXNUM_ARITHMETIC_OP(OP) \
     do { \
         ssize_t n = AS_FIXNUM(array_pop(vm->stack)); \
@@ -152,6 +160,15 @@ vm_interpret(VM *vm, Chunk *chunk) {
                 Object name = array_pop(vm->stack);
                 ht_insert(vm->globals, name, value);
             } break;
+            case OP_GET_GLOBAL: {
+                Object name = array_pop(vm->stack);
+                Object *value = ht_lookup(vm->globals, name);
+                if (value == NULL) {
+                    SYMBOL_NOT_FOUND_ERR();
+                    return;
+                }
+                array_push(vm->stack, *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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