9 files changed, 86 insertions, 30 deletions

diff --git a/src/common/common_funcs.h b/src/common/common_funcs.h
index 47d028d48..ba3081efb 100644
--- a/src/common/common_funcs.h
+++ b/src/common/common_funcs.h
@@ -123,6 +123,12 @@ namespace Common {
     return u32(a) | u32(b) << 8 | u32(c) << 16 | u32(d) << 24;
 }
 
+[[nodiscard]] constexpr u64 MakeMagic(char a, char b, char c, char d, char e, char f, char g,
+                                      char h) {
+    return u64(a) << 0 | u64(b) << 8 | u64(c) << 16 | u64(d) << 24 | u64(e) << 32 | u64(f) << 40 |
+           u64(g) << 48 | u64(h) << 56;
+}
+
 // std::size() does not support zero-size C arrays. We're fixing that.
 template <class C>
 constexpr auto Size(const C& c) -> decltype(c.size()) {
diff --git a/src/common/fs/path_util.cpp b/src/common/fs/path_util.cpp
index c3a81f9a9..4f69db6f5 100644
--- a/src/common/fs/path_util.cpp
+++ b/src/common/fs/path_util.cpp
@@ -354,18 +354,36 @@ std::string_view RemoveTrailingSlash(std::string_view path) {
     return path;
 }
 
-std::vector<std::string> SplitPathComponents(std::string_view filename) {
-    std::string copy(filename);
-    std::replace(copy.begin(), copy.end(), '\\', '/');
-    std::vector<std::string> out;
-
-    std::stringstream stream(copy);
-    std::string item;
-    while (std::getline(stream, item, '/')) {
-        out.push_back(std::move(item));
+template <typename F>
+static void ForEachPathComponent(std::string_view filename, F&& cb) {
+    const char* component_begin = filename.data();
+    const char* const end = component_begin + filename.size();
+    for (const char* it = component_begin; it != end; ++it) {
+        const char c = *it;
+        if (c == '\\' || c == '/') {
+            if (component_begin != it) {
+                cb(std::string_view{component_begin, it});
+            }
+            component_begin = it + 1;
+        }
+    }
+    if (component_begin != end) {
+        cb(std::string_view{component_begin, end});
     }
+}
+
+std::vector<std::string_view> SplitPathComponents(std::string_view filename) {
+    std::vector<std::string_view> components;
+    ForEachPathComponent(filename, [&](auto component) { components.emplace_back(component); });
 
-    return out;
+    return components;
+}
+
+std::vector<std::string> SplitPathComponentsCopy(std::string_view filename) {
+    std::vector<std::string> components;
+    ForEachPathComponent(filename, [&](auto component) { components.emplace_back(component); });
+
+    return components;
 }
 
 std::string SanitizePath(std::string_view path_, DirectorySeparator directory_separator) {
@@ -400,9 +418,9 @@ std::string SanitizePath(std::string_view path_, DirectorySeparator directory_se
     return std::string(RemoveTrailingSlash(path));
 }
 
-std::string_view GetParentPath(std::string_view path) {
+std::string GetParentPath(std::string_view path) {
     if (path.empty()) {
-        return path;
+        return std::string(path);
     }
 
 #ifdef ANDROID
@@ -421,7 +439,7 @@ std::string_view GetParentPath(std::string_view path) {
         name_index = std::max(name_bck_index, name_fwd_index);
     }
 
-    return path.substr(0, name_index);
+    return std::string(path.substr(0, name_index));
 }
 
 std::string_view GetPathWithoutTop(std::string_view path) {
diff --git a/src/common/fs/path_util.h b/src/common/fs/path_util.h
index 2874ea738..59301e7ed 100644
--- a/src/common/fs/path_util.h
+++ b/src/common/fs/path_util.h
@@ -289,7 +289,11 @@ enum class DirectorySeparator {
 
 // Splits the path on '/' or '\' and put the components into a vector
 // i.e. "C:\Users\Yuzu\Documents\save.bin" becomes {"C:", "Users", "Yuzu", "Documents", "save.bin" }
-[[nodiscard]] std::vector<std::string> SplitPathComponents(std::string_view filename);
+[[nodiscard]] std::vector<std::string_view> SplitPathComponents(std::string_view filename);
+
+// Splits the path on '/' or '\' and put the components into a vector
+// i.e. "C:\Users\Yuzu\Documents\save.bin" becomes {"C:", "Users", "Yuzu", "Documents", "save.bin" }
+[[nodiscard]] std::vector<std::string> SplitPathComponentsCopy(std::string_view filename);
 
 // Removes trailing slash, makes all '\\' into '/', and removes duplicate '/'. Makes '/' into '\\'
 // depending if directory_separator is BackwardSlash or PlatformDefault and running on windows
@@ -298,7 +302,7 @@ enum class DirectorySeparator {
     DirectorySeparator directory_separator = DirectorySeparator::ForwardSlash);
 
 // Gets all of the text up to the last '/' or '\' in the path.
-[[nodiscard]] std::string_view GetParentPath(std::string_view path);
+[[nodiscard]] std::string GetParentPath(std::string_view path);
 
 // Gets all of the text after the first '/' or '\' in the path.
 [[nodiscard]] std::string_view GetPathWithoutTop(std::string_view path);
diff --git a/src/common/host_memory.cpp b/src/common/host_memory.cpp
index 4bfc64f2d..e540375b8 100644
--- a/src/common/host_memory.cpp
+++ b/src/common/host_memory.cpp
@@ -11,10 +11,6 @@
 
 #elif defined(__linux__) || defined(__FreeBSD__) // ^^^ Windows ^^^ vvv Linux vvv
 
-#ifdef ANDROID
-#include <android/sharedmem.h>
-#endif
-
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
@@ -193,6 +189,11 @@ public:
         }
     }
 
+    bool ClearBackingRegion(size_t physical_offset, size_t length) {
+        // TODO: This does not seem to be possible on Windows.
+        return false;
+    }
+
     void EnableDirectMappedAddress() {
         // TODO
         UNREACHABLE();
@@ -442,9 +443,7 @@ public:
         }
 
         // Backing memory initialization
-#ifdef ANDROID
-        fd = ASharedMemory_create("HostMemory", backing_size);
-#elif defined(__FreeBSD__) && __FreeBSD__ < 13
+#if defined(__FreeBSD__) && __FreeBSD__ < 13
         // XXX Drop after FreeBSD 12.* reaches EOL on 2024-06-30
         fd = shm_open(SHM_ANON, O_RDWR, 0600);
 #else
@@ -455,7 +454,6 @@ public:
             throw std::bad_alloc{};
         }
 
-#ifndef ANDROID
         // Defined to extend the file with zeros
         int ret = ftruncate(fd, backing_size);
         if (ret != 0) {
@@ -463,7 +461,6 @@ public:
                          strerror(errno));
             throw std::bad_alloc{};
         }
-#endif
 
         backing_base = static_cast<u8*>(
             mmap(nullptr, backing_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0));
@@ -552,6 +549,19 @@ public:
         ASSERT_MSG(ret == 0, "mprotect failed: {}", strerror(errno));
     }
 
+    bool ClearBackingRegion(size_t physical_offset, size_t length) {
+#ifdef __linux__
+        // Set MADV_REMOVE on backing map to destroy it instantly.
+        // This also deletes the area from the backing file.
+        int ret = madvise(backing_base + physical_offset, length, MADV_REMOVE);
+        ASSERT_MSG(ret == 0, "madvise failed: {}", strerror(errno));
+
+        return true;
+#else
+        return false;
+#endif
+    }
+
     void EnableDirectMappedAddress() {
         virtual_base = nullptr;
     }
@@ -623,6 +633,10 @@ public:
 
     void Protect(size_t virtual_offset, size_t length, bool read, bool write, bool execute) {}
 
+    bool ClearBackingRegion(size_t physical_offset, size_t length) {
+        return false;
+    }
+
     void EnableDirectMappedAddress() {}
 
     u8* backing_base{nullptr};
@@ -698,6 +712,12 @@ void HostMemory::Protect(size_t virtual_offset, size_t length, bool read, bool w
     impl->Protect(virtual_offset + virtual_base_offset, length, read, write, execute);
 }
 
+void HostMemory::ClearBackingRegion(size_t physical_offset, size_t length, u32 fill_value) {
+    if (!impl || fill_value != 0 || !impl->ClearBackingRegion(physical_offset, length)) {
+        std::memset(backing_base + physical_offset, fill_value, length);
+    }
+}
+
 void HostMemory::EnableDirectMappedAddress() {
     if (impl) {
         impl->EnableDirectMappedAddress();
diff --git a/src/common/host_memory.h b/src/common/host_memory.h
index cebfacab2..747c5850c 100644
--- a/src/common/host_memory.h
+++ b/src/common/host_memory.h
@@ -48,6 +48,8 @@ public:
 
     void EnableDirectMappedAddress();
 
+    void ClearBackingRegion(size_t physical_offset, size_t length, u32 fill_value);
+
     [[nodiscard]] u8* BackingBasePointer() noexcept {
         return backing_base;
     }
diff --git a/src/common/settings.cpp b/src/common/settings.cpp
index 88f509ba7..ea52bbfa6 100644
--- a/src/common/settings.cpp
+++ b/src/common/settings.cpp
@@ -211,6 +211,8 @@ const char* TranslateCategory(Category category) {
     case Category::Debugging:
     case Category::DebuggingGraphics:
         return "Debugging";
+    case Category::GpuDriver:
+        return "GpuDriver";
     case Category::Miscellaneous:
         return "Miscellaneous";
     case Category::Network:
diff --git a/src/common/settings.h b/src/common/settings.h
index 7dc18fffe..07dba53ab 100644
--- a/src/common/settings.h
+++ b/src/common/settings.h
@@ -197,7 +197,7 @@ struct Values {
     SwitchableSetting<CpuAccuracy, true> cpu_accuracy{linkage,           CpuAccuracy::Auto,
                                                       CpuAccuracy::Auto, CpuAccuracy::Paranoid,
                                                       "cpu_accuracy",    Category::Cpu};
-    Setting<bool> cpu_debug_mode{linkage, false, "cpu_debug_mode", Category::CpuDebug};
+    SwitchableSetting<bool> cpu_debug_mode{linkage, false, "cpu_debug_mode", Category::CpuDebug};
 
     Setting<bool> cpuopt_page_tables{linkage, true, "cpuopt_page_tables", Category::CpuDebug};
     Setting<bool> cpuopt_block_linking{linkage, true, "cpuopt_block_linking", Category::CpuDebug};
@@ -211,9 +211,9 @@ struct Values {
     Setting<bool> cpuopt_misc_ir{linkage, true, "cpuopt_misc_ir", Category::CpuDebug};
     Setting<bool> cpuopt_reduce_misalign_checks{linkage, true, "cpuopt_reduce_misalign_checks",
                                                 Category::CpuDebug};
-    Setting<bool> cpuopt_fastmem{linkage, true, "cpuopt_fastmem", Category::CpuDebug};
-    Setting<bool> cpuopt_fastmem_exclusives{linkage, true, "cpuopt_fastmem_exclusives",
-                                            Category::CpuDebug};
+    SwitchableSetting<bool> cpuopt_fastmem{linkage, true, "cpuopt_fastmem", Category::CpuDebug};
+    SwitchableSetting<bool> cpuopt_fastmem_exclusives{linkage, true, "cpuopt_fastmem_exclusives",
+                                                      Category::CpuDebug};
     Setting<bool> cpuopt_recompile_exclusives{linkage, true, "cpuopt_recompile_exclusives",
                                               Category::CpuDebug};
     Setting<bool> cpuopt_ignore_memory_aborts{linkage, true, "cpuopt_ignore_memory_aborts",
@@ -256,7 +256,7 @@ struct Values {
                                                             AstcDecodeMode::CpuAsynchronous,
                                                             "accelerate_astc",
                                                             Category::Renderer};
-    Setting<VSyncMode, true> vsync_mode{
+    SwitchableSetting<VSyncMode, true> vsync_mode{
         linkage,     VSyncMode::Fifo,    VSyncMode::Immediate,        VSyncMode::FifoRelaxed,
         "use_vsync", Category::Renderer, Specialization::RuntimeList, true,
         true};
diff --git a/src/common/settings_common.h b/src/common/settings_common.h
index 344c04439..c82e17495 100644
--- a/src/common/settings_common.h
+++ b/src/common/settings_common.h
@@ -26,6 +26,7 @@ enum class Category : u32 {
     DataStorage,
     Debugging,
     DebuggingGraphics,
+    GpuDriver,
     Miscellaneous,
     Network,
     WebService,
diff --git a/src/common/settings_setting.h b/src/common/settings_setting.h
index 3175ab07d..0b18ca5ec 100644
--- a/src/common/settings_setting.h
+++ b/src/common/settings_setting.h
@@ -81,6 +81,9 @@ public:
     [[nodiscard]] virtual const Type& GetValue() const {
         return value;
     }
+    [[nodiscard]] virtual const Type& GetValue(bool need_global) const {
+        return value;
+    }
 
     /**
      * Sets the setting to the given value.
@@ -353,7 +356,7 @@ public:
         }
         return custom;
     }
-    [[nodiscard]] const Type& GetValue(bool need_global) const {
+    [[nodiscard]] const Type& GetValue(bool need_global) const override final {
         if (use_global || need_global) {
             return this->value;
         }