| 1 | // Copyright 2013 The Flutter Authors. All rights reserved. |
|---|---|
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #ifndef FLUTTER_FML_NATIVE_LIBRARY_H_ |
| 6 | #define FLUTTER_FML_NATIVE_LIBRARY_H_ |
| 7 | |
| 8 | #include <optional> |
| 9 | |
| 10 | #include "flutter/fml/build_config.h" |
| 11 | #include "flutter/fml/macros.h" |
| 12 | #include "flutter/fml/memory/ref_counted.h" |
| 13 | #include "flutter/fml/memory/ref_ptr.h" |
| 14 | |
| 15 | #if defined(FML_OS_WIN) |
| 16 | #include <windows.h> |
| 17 | #endif // defined(FML_OS_WIN) |
| 18 | |
| 19 | namespace fml { |
| 20 | class NativeLibrary : public fml::RefCountedThreadSafe<NativeLibrary> { |
| 21 | public: |
| 22 | #if FML_OS_WIN |
| 23 | using Handle = HMODULE; |
| 24 | using SymbolHandle = FARPROC; |
| 25 | #else // FML_OS_WIN |
| 26 | using Handle = void*; |
| 27 | using SymbolHandle = void*; |
| 28 | #endif // FML_OS_WIN |
| 29 | |
| 30 | static fml::RefPtr<NativeLibrary> Create(const char* path); |
| 31 | |
| 32 | static fml::RefPtr<NativeLibrary> CreateWithHandle( |
| 33 | Handle handle, |
| 34 | bool close_handle_when_done); |
| 35 | |
| 36 | static fml::RefPtr<NativeLibrary> CreateForCurrentProcess(); |
| 37 | |
| 38 | template <typename T> |
| 39 | const std::optional<T> ResolveFunction(const char* symbol) { |
| 40 | auto* resolved_symbol = Resolve(symbol); |
| 41 | if (!resolved_symbol) { |
| 42 | return std::nullopt; |
| 43 | } |
| 44 | return std::optional<T>(reinterpret_cast<T>(resolved_symbol)); |
| 45 | } |
| 46 | |
| 47 | const uint8_t* ResolveSymbol(const char* symbol) { |
| 48 | auto* resolved_symbol = reinterpret_cast<const uint8_t*>(Resolve(symbol)); |
| 49 | if (resolved_symbol == nullptr) { |
| 50 | FML_DLOG(INFO) << "Could not resolve symbol in library: "<< symbol; |
| 51 | } |
| 52 | return resolved_symbol; |
| 53 | } |
| 54 | |
| 55 | private: |
| 56 | Handle handle_ = nullptr; |
| 57 | bool close_handle_ = true; |
| 58 | |
| 59 | explicit NativeLibrary(const char* path); |
| 60 | |
| 61 | NativeLibrary(Handle handle, bool close_handle); |
| 62 | |
| 63 | ~NativeLibrary(); |
| 64 | |
| 65 | Handle GetHandle() const; |
| 66 | SymbolHandle Resolve(const char* symbol) const; |
| 67 | |
| 68 | FML_DISALLOW_COPY_AND_ASSIGN(NativeLibrary); |
| 69 | FML_FRIEND_REF_COUNTED_THREAD_SAFE(NativeLibrary); |
| 70 | FML_FRIEND_MAKE_REF_COUNTED(NativeLibrary); |
| 71 | }; |
| 72 | |
| 73 | } // namespace fml |
| 74 | |
| 75 | #endif // FLUTTER_FML_NATIVE_LIBRARY_H_ |
| 76 |