Mostly complete tracing. Probably a lot of bugs.

src/xenia/debug_agent.cc

@@ -0,0 +1,79 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2014 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include <xenia/debug_agent.h>
+
+#include <codecvt>
+
+#include <gflags/gflags.h>
+
+DEFINE_string(trace_file, "", "Trace to the given file.");
+DEFINE_uint64(trace_capacity, 0x40000000, "Trace file capacity to allocate.");
+
+namespace xe {
+
+DebugAgent::DebugAgent(Emulator* emulator)
+    : emulator_(emulator),
+      file_(nullptr),
+      file_mapping_(nullptr),
+      trace_base_(0) {}
+
+DebugAgent::~DebugAgent() {
+  if (trace_base_) {
+    UnmapViewOfFile(trace_base_);
+  }
+
+  CloseHandle(file_mapping_);
+  CloseHandle(file_);
+}
+
+int DebugAgent::Initialize() {
+  if (!FLAGS_trace_file.empty()) {
+    if (SetupTracing(FLAGS_trace_file, FLAGS_trace_capacity)) {
+      XELOGE("Failed to setup tracing - out of disk space?");
+      return 1;
+    }
+  }
+
+  return 0;
+}
+
+int DebugAgent::SetupTracing(const std::string& trace_file, uint64_t capacity) {
+  std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> cvt;
+  auto file_path = cvt.from_bytes(trace_file);
+  file_ = CreateFile(file_path.c_str(), GENERIC_READ | GENERIC_WRITE,
+                     FILE_SHARE_READ | FILE_SHARE_WRITE, nullptr, CREATE_ALWAYS,
+                     FILE_ATTRIBUTE_NORMAL | FILE_ATTRIBUTE_TEMPORARY,
+                     nullptr);
+  if (!file_) {
+    XELOGE("Could not open trace file for writing");
+    return 1;
+  }
+
+  file_mapping_ = CreateFileMapping(
+      file_, nullptr, PAGE_READWRITE, static_cast<uint32_t>(capacity >> 32),
+      static_cast<uint32_t>(capacity), L"Local\\xenia_xdb_trace");
+  if (!file_mapping_) {
+    XELOGE("Could not create trace file mapping - out of disk space?");
+    return 1;
+  }
+
+  trace_base_ = MapViewOfFile(file_mapping_, FILE_MAP_WRITE, 0, 0, 0);
+  if (!trace_base_) {
+    XELOGE("Could not map view of trace file - out of disk space?");
+    return 1;
+  }
+
+  // Store initial trace base.
+  poly::store<uint64_t>(trace_base_, trace_base() + 8);
+
+  return 0;
+}
+
+}  // namespace xe