From 50473e5ab573d85b1a555874332f6aecdd36f659 Mon Sep 17 00:00:00 2001
From: Tom Willemse
Date: Thu, 22 Jul 2021 01:09:11 -0700
Subject: Chapter 15.1

---
 clox/src/vm.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 clox/src/vm.c

(limited to 'clox/src/vm.c')

diff --git a/clox/src/vm.c b/clox/src/vm.c
new file mode 100644
index 0000000..14a206e
--- /dev/null
+++ b/clox/src/vm.c
@@ -0,0 +1,44 @@
+#include <stdio.h>
+
+#include "common.h"
+#include "debug.h"
+#include "vm.h"
+
+VM vm;
+
+void initVM() {}
+
+void freeVM() {}
+
+static InterpretResult run() {
+#define READ_BYTE() (*vm.ip++)
+#define READ_CONSTANT() (vm.chunk->constants.values[READ_BYTE()])
+
+  for (;;) {
+#ifdef DEBUG_TRACE_EXECUTION
+    disassembleInstruction(vm.chunk, (int)(vm.ip - vm.chunk->code));
+#endif
+
+    uint8_t instruction;
+    switch (instruction = READ_BYTE()) {
+    case OP_CONSTANT: {
+      Value constant = READ_CONSTANT();
+      printValue(constant);
+      printf("\n");
+      break;
+    }
+    case OP_RETURN: {
+      return INTERPRET_OK;
+    }
+    }
+  }
+
+#undef READ_BYTE
+#undef READ_CONSTANT
+}
+
+InterpretResult interpret(Chunk *chunk) {
+  vm.chunk = chunk;
+  vm.ip = vm.chunk->code;
+  return run();
+}
-- 
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