1 files changed, 86 insertions, 0 deletions
diff --git a/Build/source/utils/asymptote/refaccess.h b/Build/source/utils/asymptote/refaccess.h
new file mode 100644
index 00000000000..c848f8f171d
--- /dev/null
+++ b/Build/source/utils/asymptote/refaccess.h
@@ -0,0 +1,86 @@
+/*****
+ * refaccess.h
+ * Andy Hammerlindl 2003/12/03
+ *
+ * An access which refers to a variable or other object in C++.
+ *****/
+
+#ifndef REFACCESS_H
+#define REFACCESS_H
+
+#include "access.h"
+#include "inst.h"
+#include "coder.h"
+#include "stack.h"
+
+namespace trans {
+
+// Access refers to a piece of data, represented by an item, somewhere in the
+// C++ code.
+class itemRefAccess : public access {
+  vm::item *ref;
+
+public:
+  itemRefAccess(vm::item *ref)
+    : ref(ref) {}
+
+  void encode(action act, position pos, coder &e);
+  void encode(action act, position pos, coder &e, frame *);
+};
+
+// Access refers to an arbitrary piece of data of type T.
+template <class T>
+class refAccess : public access {
+  T *ref;
+
+public:
+  refAccess(T *ref)
+    : ref(ref) {}
+
+  void encode(action act, position pos, coder &e);
+  void encode(action act, position pos, coder &e, frame *);
+};
+
+template <class T>
+void pointerRead(vm::stack *s) {
+  T *ptr=vm::pop<T *>(s);
+  s->push(*ptr);
+}
+
+template <class T>
+void pointerWrite(vm::stack *s) {
+  T *ptr=vm::pop<T *>(s);
+  T value=vm::pop<T>(s);
+  *ptr=value;
+  s->push(value);
+}
+
+template <class T>
+void refAccess<T>::encode(action act, position, coder &e)
+{
+  e.encode(vm::inst::constpush, (vm::item)ref);
+
+  switch (act) {
+    case READ:
+      e.encode(vm::inst::builtin, (bltin) pointerRead<T>);
+      break;
+    case WRITE:
+      e.encode(vm::inst::builtin, (bltin) pointerWrite<T>);
+      break;
+    case CALL:
+      e.encode(vm::inst::builtin, (bltin) pointerRead<T>);
+      e.encode(vm::inst::popcall);
+      break;
+  };
+}
+
+template <class T>
+void refAccess<T>::encode(action act, position pos, coder &e, frame *)
+{
+  // Get rid of the useless top frame.
+  e.encode(vm::inst::pop);
+  encode(act, pos, e);
+}
+
+}
+#endif