store current_pos in VM for better logging

src/instructions/impl/impl_macros.h

@@ -2,14 +2,14 @@
 #include "../instructions.h"
 
 #define readVar(VAR) {\
-    if(!VM_dataRead(vm, &VAR, pos, sizeof(VAR))) \
+    if(!VM_dataRead(vm, &VAR, vm->current_pos, sizeof(VAR))) \
         return -1;\
-    pos += sizeof(VAR);\
+    vm->current_pos += sizeof(VAR);\
 }
 
 #define validateRegisterIndex(VAR) {\
     if(VAR > sizeof(vm->registers)){\
-        VM_setErrorMessage(vm, "[%p] invalid register index (%x)", (void*)pos, VAR);\
+        VM_setError(vm, "invalid register index (%x)", VAR);\
         return -1;\
     }\
 }
@@ -21,7 +21,7 @@
 
 #define validateValueSize(VAR) {\
     if(VAR < 1 || VAR > 4){\
-        VM_setErrorMessage(vm, "[%p] invalid value_size (%x)", (void*)pos, VAR);\
+        VM_setError(vm, "invalid value_size (%x)", VAR);\
         return -1;\
     }\
 }