qt: implement automatic crash dump support

src/yuzu/breakpad.cpp

@@ -0,0 +1,77 @@
+// SPDX-FileCopyrightText: 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <algorithm>
+#include <ranges>
+
+#if defined(_WIN32)
+#include <client/windows/handler/exception_handler.h>
+#elif defined(__linux__)
+#include <client/linux/handler/exception_handler.h>
+#else
+#error Minidump creation not supported on this platform
+#endif
+
+#include "common/fs/fs_paths.h"
+#include "common/fs/path_util.h"
+#include "yuzu/breakpad.h"
+
+namespace Breakpad {
+
+static void PruneDumpDirectory(const std::filesystem::path& dump_path) {
+    // Code in this function should be exception-safe.
+    struct Entry {
+        std::filesystem::path path;
+        std::filesystem::file_time_type last_write_time;
+    };
+    std::vector<Entry> existing_dumps;
+
+    // Get existing entries.
+    std::error_code ec;
+    std::filesystem::directory_iterator dir(dump_path, ec);
+    for (auto& entry : dir) {
+        if (entry.is_regular_file()) {
+            existing_dumps.push_back(Entry{
+                .path = entry.path(),
+                .last_write_time = entry.last_write_time(ec),
+            });
+        }
+    }
+
+    // Sort descending by creation date.
+    std::ranges::stable_sort(existing_dumps, [](const auto& a, const auto& b) {
+        return a.last_write_time > b.last_write_time;
+    });
+
+    // Delete older dumps.
+    for (size_t i = 5; i < existing_dumps.size(); i++) {
+        std::filesystem::remove(existing_dumps[i].path, ec);
+    }
+}
+
+#if defined(__linux__)
+[[noreturn]] bool DumpCallback(const google_breakpad::MinidumpDescriptor& descriptor, void* context,
+                               bool succeeded) {
+    // Prevent time- and space-consuming core dumps from being generated, as we have
+    // already generated a minidump and a core file will not be useful anyway.
+    _exit(1);
+}
+#endif
+
+void InstallCrashHandler() {
+    // Write crash dumps to profile directory.
+    const auto dump_path = GetYuzuPath(Common::FS::YuzuPath::CrashDumpsDir);
+    PruneDumpDirectory(dump_path);
+
+#if defined(_WIN32)
+    // TODO: If we switch to MinGW builds for Windows, this needs to be wrapped in a C API.
+    static google_breakpad::ExceptionHandler eh{dump_path, nullptr, nullptr, nullptr,
+                                                google_breakpad::ExceptionHandler::HANDLER_ALL};
+#elif defined(__linux__)
+    static google_breakpad::MinidumpDescriptor descriptor{dump_path};
+    static google_breakpad::ExceptionHandler eh{descriptor, nullptr, DumpCallback,
+                                                nullptr,    true,    -1};
+#endif
+}
+
+} // namespace Breakpad