Chapter 15.1

1 files changed, 44 insertions, 0 deletions

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();
+}