Initial Alloy implementation.

This is a regression in functionality and performance, but a much better
foundation for the future of the project (I think). It can run basic
apps under an SSA interpreter but doesn't support some of the features
required to do real 360 apps yet.

src/alloy/runtime/function.h

@@ -0,0 +1,85 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2013 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef ALLOY_RUNTIME_FUNCTION_H_
+#define ALLOY_RUNTIME_FUNCTION_H_
+
+#include <alloy/core.h>
+
+
+namespace alloy {
+namespace runtime {
+
+class FunctionInfo;
+class ThreadState;
+
+
+class Function {
+public:
+  enum Type {
+    UNKNOWN_FUNCTION = 0,
+    EXTERN_FUNCTION,
+    USER_FUNCTION,
+  };
+public:
+  Function(Type type, uint64_t address);
+  virtual ~Function();
+
+  Type type() const { return type_; }
+  uint64_t address() const { return address_; }
+
+  int Call(ThreadState* thread_state);
+
+protected:
+  virtual int CallImpl(ThreadState* thread_state) = 0;
+
+protected:
+  Type        type_;
+  uint64_t    address_;
+};
+
+
+class ExternFunction : public Function {
+public:
+  typedef void(*Handler)(void* context, void* arg0, void* arg1);
+public:
+  ExternFunction(uint64_t address, Handler handler, void* arg0, void* arg1);
+  virtual ~ExternFunction();
+
+  Handler handler() const { return handler_; }
+  void* arg0() const { return arg0_; }
+  void* arg1() const { return arg1_; }
+
+protected:
+  virtual int CallImpl(ThreadState* thread_state);
+
+protected:
+  Handler handler_;
+  void* arg0_;
+  void* arg1_;
+};
+
+
+class GuestFunction : public Function {
+public:
+  GuestFunction(FunctionInfo* symbol_info);
+  virtual ~GuestFunction();
+
+  FunctionInfo* symbol_info() const { return symbol_info_; }
+
+protected:
+  FunctionInfo* symbol_info_;
+};
+
+
+}  // namespace runtime
+}  // namespace alloy
+
+
+#endif  // ALLOY_RUNTIME_FUNCTION_H_