feat: improve REL and Relocation

.github/workflows/main_ci.yml

@@ -1,4 +1,4 @@
-name: Main CI
+name: build
 
 on:
   push:

.github/workflows/maintenance.yml

@@ -1,15 +1,13 @@
-name: Scripted maintenance
+name: maintenance
 
-on: [push, pull_request_target]
+on: [push]
 
 jobs:
   maintenance:
     runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v2
-        with:
-          ref: ${{ github.head_ref }}
 
       - uses: actions/setup-python@v2
         with:

CommonLibF4/cmake/sourcelist.cmake

@@ -344,7 +344,15 @@ set(SOURCES
 	include/RE/VTABLE_IDs.h
 	include/RE/msvc/memory.h
 	include/RE/msvc/typeinfo.h
+	include/REL/ID.h
+	include/REL/IDDB.h
+	include/REL/Module.h
+	include/REL/Offset.h
+	include/REL/Offset2ID.h
+	include/REL/REL.h
 	include/REL/Relocation.h
+	include/REL/Segment.h
+	include/REL/Version.h
 	include/REX/W32.h
 	include/REX/W32/ADVAPI32.h
 	include/REX/W32/BASE.h
@@ -413,7 +421,10 @@ set(SOURCES
 	src/RE/NetImmerse/NiPoint3.cpp
 	src/RE/NetImmerse/NiRect.cpp
 	src/RE/Scaleform/GFx/GFx_Player.cpp
+	src/REL/IDDB.cpp
+	src/REL/Module.cpp
 	src/REL/Relocation.cpp
+	src/REL/Version.cpp
 	src/REX/W32/ADVAPI32.cpp
 	src/REX/W32/BCRYPT.cpp
 	src/REX/W32/D3D11.cpp

CommonLibF4/include/F4SE/API.h

@@ -16,8 +16,6 @@ namespace F4SE
 	class ObjectInterface;
 	class TrampolineInterface;
 
-	class Trampoline;
-
 	void Init(const LoadInterface* a_intfc, bool a_log = true) noexcept;
 
 	[[nodiscard]] std::string_view GetPluginName() noexcept;
@@ -38,6 +36,5 @@ namespace F4SE
 	[[nodiscard]] const ObjectInterface* GetObjectInterface() noexcept;
 	[[nodiscard]] const TrampolineInterface* GetTrampolineInterface() noexcept;
 
-	[[nodiscard]] Trampoline& GetTrampoline() noexcept;
 	void AllocTrampoline(std::size_t a_size) noexcept;
 }

CommonLibF4/include/F4SE/Impl/PCH.h

@@ -723,7 +723,7 @@ namespace REL
 	namespace stl = F4SE::stl;
 }
 
-#include "REL/Relocation.h"
+#include "REL/REL.h"
 
 #include "RE/NiRTTI_IDs.h"
 #include "RE/RTTI_IDs.h"

CommonLibF4/include/F4SE/Trampoline.h

@@ -9,33 +9,6 @@ namespace Xbyak
 
 namespace F4SE
 {
-	namespace detail
-	{
-		[[nodiscard]] constexpr std::size_t roundup(std::size_t a_number, std::size_t a_multiple) noexcept
-		{
-			if (a_multiple == 0) {
-				return 0;
-			}
-
-			const auto remainder = a_number % a_multiple;
-			return remainder == 0 ?
-			           a_number :
-			           a_number + a_multiple - remainder;
-		}
-
-		[[nodiscard]] constexpr std::size_t rounddown(std::size_t a_number, std::size_t a_multiple) noexcept
-		{
-			if (a_multiple == 0) {
-				return 0;
-			}
-
-			const auto remainder = a_number % a_multiple;
-			return remainder == 0 ?
-			           a_number :
-			           a_number - remainder;
-		}
-	}
-
 	class Trampoline
 	{
 	public:
@@ -62,32 +35,9 @@ namespace F4SE
 			return *this;
 		}
 
-		void create(std::size_t a_size) { return create(a_size, nullptr); }
+		void create(std::size_t a_size, void* a_module = nullptr);
 
-		void create(std::size_t a_size, void* a_module)
-		{
-			if (a_size == 0) {
-				stl::report_and_fail("cannot create a trampoline with a zero size"sv);
-			}
-
-			if (!a_module) {
-				const auto text = REL::Module::get().segment(REL::Segment::text);
-				a_module = text.pointer<std::byte>() + text.size();
-			}
-
-			auto mem = do_create(a_size, reinterpret_cast<std::uintptr_t>(a_module));
-			if (!mem) {
-				stl::report_and_fail("failed to create trampoline"sv);
-			}
-
-			set_trampoline(mem, a_size, [](void* a_mem, std::size_t) {
-				REX::W32::VirtualFree(a_mem, 0, REX::W32::MEM_RELEASE);
-			});
-		}
-
-		void set_trampoline(void* a_trampoline, std::size_t a_size) { set_trampoline(a_trampoline, a_size, {}); }
-
-		void set_trampoline(void* a_trampoline, std::size_t a_size, deleter_type a_deleter)
+		void set_trampoline(void* a_trampoline, std::size_t a_size, deleter_type a_deleter = {})
 		{
 			auto trampoline = static_cast<std::byte*>(a_trampoline);
 			if (trampoline) {
@@ -179,122 +129,10 @@ namespace F4SE
 
 	private:
 		[[nodiscard]] static void* do_create(std::size_t a_size, std::uintptr_t a_address);
+		[[nodiscard]] void* do_allocate(std::size_t a_size);
 
-		[[nodiscard]] static bool in_range(std::ptrdiff_t a_disp)
-		{
-			constexpr auto min = std::numeric_limits<std::int32_t>::min();
-			constexpr auto max = std::numeric_limits<std::int32_t>::max();
-
-			return min <= a_disp && a_disp <= max;
-		}
-
-		[[nodiscard]] void* do_allocate(std::size_t a_size)
-		{
-			if (a_size > free_size()) {
-				stl::report_and_fail("Failed to handle allocation request"sv);
-			}
-
-			auto mem = _data + _size;
-			_size += a_size;
-
-			return mem;
-		}
-
-		void write_5branch(std::uintptr_t a_src, std::uintptr_t a_dst, std::uint8_t a_opcode)
-		{
-#pragma pack(push, 1)
-			struct SrcAssembly
-			{
-				// jmp/call [rip + imm32]
-				std::uint8_t opcode{ 0 };  // 0 - 0xE9/0xE8
-				std::int32_t disp{ 0 };    // 1
-			};
-			static_assert(offsetof(SrcAssembly, opcode) == 0x0);
-			static_assert(offsetof(SrcAssembly, disp) == 0x1);
-			static_assert(sizeof(SrcAssembly) == 0x5);
-
-			// FF /4
-			// JMP r/m64
-			struct TrampolineAssembly
-			{
-				// jmp [rip]
-				std::uint8_t jmp{ 0 };    // 0 - 0xFF
-				std::uint8_t modrm{ 0 };  // 1 - 0x25
-				std::int32_t disp{ 0 };   // 2 - 0x00000000
-				std::uint64_t addr{ 0 };  // 6 - [rip]
-			};
-			static_assert(offsetof(TrampolineAssembly, jmp) == 0x0);
-			static_assert(offsetof(TrampolineAssembly, modrm) == 0x1);
-			static_assert(offsetof(TrampolineAssembly, disp) == 0x2);
-			static_assert(offsetof(TrampolineAssembly, addr) == 0x6);
-			static_assert(sizeof(TrampolineAssembly) == 0xE);
-#pragma pack(pop)
-
-			TrampolineAssembly* mem = nullptr;
-			if (const auto it = _5branches.find(a_dst); it != _5branches.end()) {
-				mem = reinterpret_cast<TrampolineAssembly*>(it->second);
-			} else {
-				mem = allocate<TrampolineAssembly>();
-				_5branches.emplace(a_dst, reinterpret_cast<std::byte*>(mem));
-			}
-
-			const auto disp =
-				reinterpret_cast<const std::byte*>(mem) -
-				reinterpret_cast<const std::byte*>(a_src + sizeof(SrcAssembly));
-			if (!in_range(disp)) {  // the trampoline should already be in range, so this should never happen
-				stl::report_and_fail("displacement is out of range"sv);
-			}
-
-			SrcAssembly assembly;
-			assembly.opcode = a_opcode;
-			assembly.disp = static_cast<std::int32_t>(disp);
-			REL::safe_write(a_src, &assembly, sizeof(assembly));
-
-			mem->jmp = static_cast<std::uint8_t>(0xFF);
-			mem->modrm = static_cast<std::uint8_t>(0x25);
-			mem->disp = static_cast<std::int32_t>(0);
-			mem->addr = static_cast<std::uint64_t>(a_dst);
-		}
-
-		void write_6branch(std::uintptr_t a_src, std::uintptr_t a_dst, std::uint8_t a_modrm)
-		{
-#pragma pack(push, 1)
-			struct Assembly
-			{
-				// jmp/call [rip + imm32]
-				std::uint8_t opcode{ 0 };  // 0 - 0xFF
-				std::uint8_t modrm{ 0 };   // 1 - 0x25/0x15
-				std::int32_t disp{ 0 };    // 2
-			};
-			static_assert(offsetof(Assembly, opcode) == 0x0);
-			static_assert(offsetof(Assembly, modrm) == 0x1);
-			static_assert(offsetof(Assembly, disp) == 0x2);
-			static_assert(sizeof(Assembly) == 0x6);
-#pragma pack(pop)
-
-			std::uintptr_t* mem = nullptr;
-			if (const auto it = _6branches.find(a_dst); it != _6branches.end()) {
-				mem = reinterpret_cast<std::uintptr_t*>(it->second);
-			} else {
-				mem = allocate<std::uintptr_t>();
-				_6branches.emplace(a_dst, reinterpret_cast<std::byte*>(mem));
-			}
-
-			const auto disp =
-				reinterpret_cast<const std::byte*>(mem) -
-				reinterpret_cast<const std::byte*>(a_src + sizeof(Assembly));
-			if (!in_range(disp)) {  // the trampoline should already be in range, so this should never happen
-				stl::report_and_fail("displacement is out of range"sv);
-			}
-
-			Assembly assembly;
-			assembly.opcode = static_cast<std::uint8_t>(0xFF);
-			assembly.modrm = a_modrm;
-			assembly.disp = static_cast<std::int32_t>(disp);
-			REL::safe_write(a_src, &assembly, sizeof(assembly));
-
-			*mem = a_dst;
-		}
+		void write_5branch(std::uintptr_t a_src, std::uintptr_t a_dst, std::uint8_t a_opcode);
+		void write_6branch(std::uintptr_t a_src, std::uintptr_t a_dst, std::uint8_t a_modrm);
 
 		template <std::size_t N>
 		[[nodiscard]] std::uintptr_t write_branch(std::uintptr_t a_src, std::uintptr_t a_dst, std::uint8_t a_data)
@@ -347,6 +185,14 @@ namespace F4SE
 			_size = 0;
 		}
 
+		[[nodiscard]] static bool in_range(std::ptrdiff_t a_disp)
+		{
+			constexpr auto min = std::numeric_limits<std::int32_t>::min();
+			constexpr auto max = std::numeric_limits<std::int32_t>::max();
+
+			return min <= a_disp && a_disp <= max;
+		}
+
 		std::map<std::uintptr_t, std::byte*> _5branches;
 		std::map<std::uintptr_t, std::byte*> _6branches;
 		std::string _name{ "Default Trampoline"sv };
@@ -355,4 +201,6 @@ namespace F4SE
 		std::size_t _capacity{ 0 };
 		std::size_t _size{ 0 };
 	};
+
+	[[nodiscard]] Trampoline& GetTrampoline() noexcept;
 }

CommonLibF4/include/REL/ID.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include "REL/IDDB.h"
+#include "REL/Module.h"
+
+namespace REL
+{
+	class ID
+	{
+	public:
+		constexpr ID() noexcept = default;
+
+		explicit constexpr ID(std::uint64_t a_id) noexcept :
+			_id(a_id)
+		{}
+
+		constexpr ID& operator=(std::uint64_t a_id) noexcept
+		{
+			_id = a_id;
+			return *this;
+		}
+
+		[[nodiscard]] std::uintptr_t address() const { return base() + offset(); }
+		[[nodiscard]] constexpr std::uint64_t id() const noexcept { return _id; }
+		[[nodiscard]] std::size_t offset() const { return IDDB::get().id2offset(_id); }
+
+	private:
+		[[nodiscard]] static std::uintptr_t base() { return Module::get().base(); }
+
+		std::uint64_t _id{ static_cast<std::uint64_t>(-1) };
+	};
+}

CommonLibF4/include/REL/IDDB.h

@@ -0,0 +1,60 @@
+#pragma once
+
+namespace REL
+{
+	class IDDB
+	{
+	private:
+		struct mapping_t
+		{
+			std::uint64_t id;
+			std::uint64_t offset;
+		};
+
+	public:
+		IDDB(const IDDB&) = delete;
+		IDDB(IDDB&&) = delete;
+
+		IDDB& operator=(const IDDB&) = delete;
+		IDDB& operator=(IDDB&&) = delete;
+
+		[[nodiscard]] static IDDB& get()
+		{
+			static IDDB singleton;
+			return singleton;
+		}
+
+		[[nodiscard]] std::size_t id2offset(std::uint64_t a_id) const
+		{
+			if (_id2offset.empty()) {
+				stl::report_and_fail("data is empty"sv);
+			}
+
+			const mapping_t elem{ a_id, 0 };
+			const auto it = std::lower_bound(
+				_id2offset.begin(),
+				_id2offset.end(),
+				elem,
+				[](auto&& a_lhs, auto&& a_rhs) {
+					return a_lhs.id < a_rhs.id;
+				});
+			if (it == _id2offset.end()) {
+				stl::report_and_fail("id not found"sv);
+			}
+
+			return static_cast<std::size_t>(it->offset);
+		}
+
+	protected:
+		friend class Offset2ID;
+
+		[[nodiscard]] std::span<const mapping_t> get_id2offset() const noexcept { return _id2offset; }
+
+	private:
+		IDDB();
+		~IDDB() = default;
+
+		mmio::mapped_file_source _mmap;
+		std::span<const mapping_t> _id2offset;
+	};
+}