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-rw-r--r--Build/source/utils/asymptote/refaccess.h86
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diff --git a/Build/source/utils/asymptote/refaccess.h b/Build/source/utils/asymptote/refaccess.h
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+/*****
+ * 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