From d9474f1d7c0c6674179fd0f27cd1c084c8227ed5 Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Fri, 22 Oct 2021 12:05:41 +0200
Subject: Add interpretation function for VM

---
 src/bytecode/vm.h | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

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

diff --git a/src/bytecode/vm.h b/src/bytecode/vm.h
index 36547cb..d53fcf9 100644
--- a/src/bytecode/vm.h
+++ b/src/bytecode/vm.h
@@ -2,14 +2,19 @@
 #define BDL_VM_H
 
 #include "types.h"
+#include "errors.h"
 #include "chunk.h"
+#include "ops.h"
+#include "debug.h"
 
 typedef struct VM {
     Chunk *chunk;
+    u8 *pc;
 } VM;
 
 VM vm_init(void);
 void vm_free(VM vm);
+void vm_interpret(VM vm);
 
 VM
 vm_init(void) {
@@ -24,4 +29,51 @@ vm_free(VM vm) {
     chunk_free(vm.chunk);
 }
 
+void
+vm_interpret(VM vm) {
+    if (vm.chunk->code == NULL || array_size(vm.chunk->code) == 0) {
+        error_push((Error){
+            .type = ERR_TYPE_RUNTIME,
+            .value = ERR_EMPTY_CHUNK,
+        });
+        return;
+    }
+
+    vm.pc = vm.chunk->code;
+    u8 *last = vm.chunk->code + array_size(vm.chunk->code);
+    while (vm.pc < last) {
+#ifdef DEBUG_TRACE_EXECUTION
+    disassemble_instruction(vm.chunk, (vm.pc - vm.chunk->code));
+#endif
+        u8 instruction = *vm.pc++;
+        switch (instruction) {
+            case OP_CONSTANT: {
+                u8 constant = *vm.pc++;
+                Object obj = vm.chunk->constants[constant];
+                display(obj);
+                printf("\n");
+            } break;
+            case OP_RETURN: {
+                return;
+            } break;
+            default: {
+                error_push((Error){
+                    .type = ERR_TYPE_RUNTIME,
+                    .value = ERR_NOT_IMPLEMENTED,
+                    .line = vm.chunk->lines[0].line,
+                    .col = vm.chunk->lines[0].col,
+                });
+                return;
+            } break;
+        }
+    }
+
+    error_push((Error){
+        .type = ERR_TYPE_RUNTIME,
+        .value = ERR_PC_OOB,
+        .line = vm.chunk->lines[0].line,
+        .col = vm.chunk->lines[0].col,
+    });
+}
+
 #endif // BDL_VM_H
-- 
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