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/thread_state.cc

@@ -0,0 +1,56 @@
+/**
+ ******************************************************************************
+ * 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. *
+ ******************************************************************************
+ */
+
+#include <alloy/runtime/thread_state.h>
+
+#include <alloy/runtime/runtime.h>
+
+using namespace alloy;
+using namespace alloy::runtime;
+
+
+namespace {
+__declspec(thread) ThreadState* thread_state_ = NULL;
+}
+
+
+ThreadState::ThreadState(Runtime* runtime, uint32_t thread_id) :
+    runtime_(runtime), memory_(runtime->memory()),
+    thread_id_(thread_id),
+    backend_data_(0), raw_context_(0) {
+  if (thread_id_ == UINT_MAX) {
+    // System thread. Assign the system thread ID with a high bit
+    // set so people know what's up.
+    uint32_t system_thread_handle = GetCurrentThreadId();
+    thread_id_ = 0x80000000 | system_thread_handle;
+  }
+  backend_data_ = runtime->backend()->AllocThreadData();
+}
+
+ThreadState::~ThreadState() {
+  if (backend_data_) {
+    runtime_->backend()->FreeThreadData(backend_data_);
+  }
+  if (thread_state_ == this) {
+    thread_state_ = NULL;
+  }
+}
+
+void ThreadState::Bind(ThreadState* thread_state) {
+  thread_state_ = thread_state;
+}
+
+ThreadState* ThreadState::Get() {
+  return thread_state_;
+}
+
+uint32_t ThreadState::GetThreadID() {
+  XEASSERT(thread_state_);
+  return thread_state_->thread_id_;
+}