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/frontend/ppc/ppc_context.cc

@@ -0,0 +1,50 @@
+/**
+ ******************************************************************************
+ * 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/frontend/ppc/ppc_context.h>
+
+using namespace alloy;
+using namespace alloy::frontend;
+using namespace alloy::frontend::ppc;
+
+
+namespace {
+
+uint64_t ParseInt64(const char* value) {
+  return xestrtoulla(value, NULL, 0);
+}
+
+}
+
+
+void PPCContext::SetRegFromString(const char* name, const char* value) {
+  int n;
+  if (sscanf(name, "r%d", &n) == 1) {
+    this->r[n] = ParseInt64(value);
+  } else {
+    printf("Unrecognized register name: %s\n", name);
+  }
+}
+
+bool PPCContext::CompareRegWithString(
+    const char* name, const char* value,
+    char* out_value, size_t out_value_size) {
+  int n;
+  if (sscanf(name, "r%d", &n) == 1) {
+    uint64_t expected = ParseInt64(value);
+    if (this->r[n] != expected) {
+      xesnprintfa(out_value, out_value_size, "%016llX", this->r[n]);
+      return false;
+    }
+    return true;
+  } else {
+    printf("Unrecognized register name: %s\n", name);
+    return false;
+  }
+}