164 lines
4.1 KiB
C++
164 lines
4.1 KiB
C++
#pragma once
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// Check Architecture
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#ifndef __arm__
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#error "Symbols Are ARM-Only"
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#endif
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// Headers
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#include <variant>
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#include <functional>
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#include <cstddef>
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#include <string>
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#include <vector>
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#include <map>
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#include <type_traits>
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#include <cstring>
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// Virtual Function Information
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template <typename T>
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class __Function;
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template <typename T>
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class __VirtualFunctionInfo {
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__VirtualFunctionInfo(T *const addr_, void *const parent_):
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addr(addr_),
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parent(parent_) {}
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[[nodiscard]] bool can_overwrite() const {
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return ((void *) *addr) != parent;
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}
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T *const addr;
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void *const parent;
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friend class __Function<std::remove_pointer_t<T>>;
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};
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// Thunks
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typedef void *(*thunk_enabler_t)(void *target, void *thunk);
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extern thunk_enabler_t thunk_enabler;
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// Function Information
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template <typename Ret, typename... Args>
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class __Function<Ret(Args...)> {
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public:
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// Types
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using ptr_type = Ret (*)(Args...);
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using type = std::function<Ret(Args...)>;
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using overwrite_type = std::function<Ret(const type &, Args...)>;
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// Normal Function
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__Function(const char *const name_, const ptr_type func_, const ptr_type thunk_):
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func(func_),
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enabled(true),
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name(name_),
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backup(func_),
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thunk(thunk_) {}
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// Virtual Function
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__Function(const char *const name_, ptr_type *const func_, void *const parent, const ptr_type thunk_):
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func(__VirtualFunctionInfo(func_, parent)),
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enabled(std::get<__VirtualFunctionInfo<ptr_type>>(func).can_overwrite()),
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name(name_),
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backup(*get_vtable_addr()),
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thunk(thunk_) {}
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// Overwrite Function
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[[nodiscard]] bool overwrite(overwrite_type target) {
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// Check If Enabled
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if (!enabled) {
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return false;
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}
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// Enable Thunk
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enable_thunk();
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// Overwrite
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type original = get_thunk_target();
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thunk_target = [original, target](Args... args) {
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return target(original, std::forward<Args>(args)...);
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};
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return true;
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}
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// Getters
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[[nodiscard]] ptr_type get(bool result_will_be_stored) {
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if (!enabled) {
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return nullptr;
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} else {
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if (result_will_be_stored) {
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enable_thunk();
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}
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if (is_virtual()) {
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return *get_vtable_addr();
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} else {
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return std::get<ptr_type>(func);
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}
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}
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}
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[[nodiscard]] ptr_type *get_vtable_addr() const {
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return std::get<__VirtualFunctionInfo<ptr_type>>(func).addr;
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}
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[[nodiscard]] type get_thunk_target() const {
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if (thunk_target) {
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return thunk_target;
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} else {
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return backup;
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}
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}
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private:
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// Current Function
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std::variant<ptr_type, __VirtualFunctionInfo<ptr_type>> func;
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[[nodiscard]] bool is_virtual() const {
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return func.index() == 1;
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}
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public:
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// State
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const bool enabled;
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const char *const name;
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// Backup Of Original Function Pointer
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const ptr_type backup;
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private:
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// Thunk
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const ptr_type thunk;
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type thunk_target;
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bool thunk_enabled = false;
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void enable_thunk() {
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if (!thunk_enabled && enabled) {
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ptr_type real_thunk = (ptr_type) thunk_enabler((void *) backup, (void *) thunk);
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if (!is_virtual()) {
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func = real_thunk;
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}
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thunk_enabled = true;
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}
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}
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};
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// Shortcuts
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typedef unsigned char uchar;
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typedef unsigned short ushort;
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typedef unsigned int uint;
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// Internal Macros
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#define __PREVENT_DESTRUCTION(self) \
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~self() = delete
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#define __PREVENT_CONSTRUCTION(self) \
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self() = delete; \
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__PREVENT_DESTRUCTION(self)
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#define __PREVENT_COPY(self) \
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self(const self &) = delete; \
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self &operator=(const self &) = delete
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// Forward Declarations
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{{ forwardDeclarations }}
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// Extra Headers
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{{ extraHeaders }}
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// Warnings
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Winvalid-offsetof"
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#pragma GCC diagnostic ignored "-Wshadow"
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{{ main }}
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// Cleanup Warnings
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#pragma GCC diagnostic pop |