Implement perfmap

src/backend/x64/perf_map.cpp

@@ -0,0 +1,89 @@
+/* This file is part of the dynarmic project.
+ * Copyright (c) 2018 MerryMage
+ * This software may be used and distributed according to the terms of the GNU
+ * General Public License version 2 or any later version.
+ */
+
+#include <cstddef>
+#include <string>
+
+#ifdef __linux__
+
+#include <cstdio>
+#include <cstdlib>
+#include <mutex>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <fmt/format.h>
+
+#include "common/common_types.h"
+
+namespace Dynarmic::BackendX64 {
+
+namespace {
+std::mutex mutex;
+std::FILE* file = nullptr;
+
+void OpenFile() {
+    const char* perf_dir = std::getenv("PERF_BUILDID_DIR");
+    if (!perf_dir) {
+        file = nullptr;
+        return;
+    }
+
+    const pid_t pid = getpid();
+    const std::string filename = fmt::format("{:s}/perf-{:d}.map", perf_dir, pid);
+
+    file = std::fopen(filename.c_str(), "w");
+    if (!file) {
+        return;
+    }
+
+    std::setvbuf(file, nullptr, _IONBF, 0);
+}
+} // anonymous namespace
+
+namespace detail {
+void PerfMapRegister(const void* start, const void* end, const std::string& friendly_name) {
+    std::lock_guard guard{mutex};
+
+    if (!file) {
+        OpenFile();
+        if (!file) {
+            return;
+        }
+    }
+
+    const std::string line = fmt::format("{:016x} {:016x} {:s}\n", reinterpret_cast<u64>(start), reinterpret_cast<u64>(end) - reinterpret_cast<u64>(start), friendly_name);
+    std::fwrite(line.data(), sizeof *line.data(), line.size(), file);
+}
+} // namespace detail
+
+void PerfMapClear() {
+    std::lock_guard guard{mutex};
+
+    if (!file) {
+        return;
+    }
+
+    std::fclose(file);
+    file = nullptr;
+    OpenFile();
+}
+
+} // namespace Dynarmic::BackendX64
+
+#else
+
+namespace Dynarmic::BackendX64 {
+
+namespace detail {
+void PerfMapRegister(const void*, const void*, const std::string&) {}
+} // namespace detail
+
+void PerfMapClear() {}
+
+} // namespace Dynarmic::BackendX64
+
+#endif