[CPU] Null backend enough for GPU trace viewing

src/xenia/cpu/backend/null_backend.cc

@@ -0,0 +1,36 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2022 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/cpu/backend/null_backend.h"
+
+#include "xenia/cpu/backend/assembler.h"
+#include "xenia/cpu/function.h"
+
+namespace xe {
+namespace cpu {
+namespace backend {
+
+void NullBackend::CommitExecutableRange(uint32_t guest_low,
+                                        uint32_t guest_high) {}
+
+std::unique_ptr<Assembler> NullBackend::CreateAssembler() { return nullptr; }
+
+std::unique_ptr<GuestFunction> NullBackend::CreateGuestFunction(
+    Module* module, uint32_t address) {
+  return nullptr;
+}
+
+uint64_t NullBackend::CalculateNextHostInstruction(ThreadDebugInfo* thread_info,
+                                                   uint64_t current_pc) {
+  return current_pc;
+}
+
+}  // namespace backend
+}  // namespace cpu
+}  // namespace xe