├── LICENSE ├── README.md ├── configurations ├── library-eager-abort.hpp.in ├── library-eager-throw.hpp.in ├── library-lazy-abort.hpp.in └── library-lazy-throw.hpp.in ├── dynalizer.py └── dynalizer └── dynalizer.hpp /LICENSE: -------------------------------------------------------------------------------- 1 | GNU AFFERO GENERAL PUBLIC LICENSE 2 | Version 3, 19 November 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU Affero General Public License is a free, copyleft license for 11 | software and other kinds of works, specifically designed to ensure 12 | cooperation with the community in the case of network server software. 13 | 14 | The licenses for most software and other practical works are designed 15 | to take away your freedom to share and change the works. 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It is safest 628 | to attach them to the start of each source file to most effectively 629 | state the exclusion of warranty; and each file should have at least 630 | the "copyright" line and a pointer to where the full notice is found. 631 | 632 | 633 | Copyright (C) 634 | 635 | This program is free software: you can redistribute it and/or modify 636 | it under the terms of the GNU Affero General Public License as published 637 | by the Free Software Foundation, either version 3 of the License, or 638 | (at your option) any later version. 639 | 640 | This program is distributed in the hope that it will be useful, 641 | but WITHOUT ANY WARRANTY; without even the implied warranty of 642 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 643 | GNU Affero General Public License for more details. 644 | 645 | You should have received a copy of the GNU Affero General Public License 646 | along with this program. If not, see . 647 | 648 | Also add information on how to contact you by electronic and paper mail. 649 | 650 | If your software can interact with users remotely through a computer 651 | network, you should also make sure that it provides a way for users to 652 | get its source. For example, if your program is a web application, its 653 | interface could display a "Source" link that leads users to an archive 654 | of the code. There are many ways you could offer source, and different 655 | solutions will be better for different programs; see section 13 for the 656 | specific requirements. 657 | 658 | You should also get your employer (if you work as a programmer) or school, 659 | if any, to sign a "copyright disclaimer" for the program, if necessary. 660 | For more information on this, and how to apply and follow the GNU AGPL, see 661 | . 662 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Dynalizer 2 | 3 | A python script which generates a C++ dynamic loader for shared objects, 4 | given a C header file. Useful when you don't want to link at compile-time, 5 | and if you want to have a beginning of C++ API for your C code. 6 | 7 | ## Dependencies 8 | 9 | `pip install clang inflection` 10 | 11 | # Example 12 | 13 | ``` 14 | $ echo 'void mylib_foo(int x, const char* bar);\nvoid mylib_bar(float** z);' > mylib.h 15 | $ python dynalizer.py header.h 16 | ``` 17 | 18 | will produce a class akin to the following : 19 | 20 | ```C++ 21 | class mylib 22 | { 23 | public: 24 | // Pass the path to your .so / .dll / .dylib here 25 | explicit mylib(const char* filepath) 26 | : m_lib{filepath} 27 | { 28 | m_sym_mylib_foo = m_lib.symbol("mylib_foo"); 29 | if(!m_sym_mylib_foo) 30 | throw std::runtime_error("Invalid symbol lookup: mylib_foo"); 31 | 32 | m_sym_mylib_bar = m_lib.symbol("mylib_bar"); 33 | if(!m_sym_mylib_bar) 34 | throw std::runtime_error("Invalid symbol lookup: mylib_bar"); 35 | } 36 | 37 | static auto& instance() { 38 | static mylib c; 39 | return c; 40 | } 41 | 42 | template 43 | auto mylib_foo(Args&&... args) -> decltype(auto) 44 | { 45 | return m_sym_mylib_foo(std::forward(args)...); 46 | } 47 | 48 | template 49 | auto mylib_bar(Args&&... args) -> decltype(auto) 50 | { 51 | return m_sym_mylib_bar(std::forward(args)...); 52 | } 53 | 54 | private: 55 | decltype(::mylib_foo)* m_sym_mylib_foo{}; 56 | decltype(::mylib_bar)* m_sym_mylib_bar{}; 57 | 58 | dynalizer::library m_lib; 59 | }; 60 | 61 | ``` 62 | 63 | # Options 64 | 65 | Multiple codegen aspects can be changed: 66 | 67 | * Lazy (`--lazy`) and eager (`--eager`) loading: in the eager case, 68 | all the symbols are loaded upon instantiation of the library. 69 | In the lazy case, symbols are not loaded until they are actually used. 70 | 71 | * Error reporting : `--throw` and `--abort`. These options define what happens 72 | when a symbol is missing: an exception, or an assertion. 73 | 74 | * Prettification : `--pretty`. If possible, will remove common suffixes of the API 75 | functions, and will port to standard C++ `snake_case`. 76 | 77 | That is, the earlier example would become instead: 78 | 79 | ```C++ 80 | template 81 | auto foo(Args&&... args) -> decltype(auto) 82 | { 83 | return m_sym_mylib_foo(std::forward(args)...); 84 | } 85 | 86 | template 87 | auto bar(Args&&... args) -> decltype(auto) 88 | { 89 | return m_sym_mylib_bar(std::forward(args)...); 90 | } 91 | ``` 92 | 93 | so that usage patterns can be akin to : 94 | 95 | ```C++ 96 | int main() { 97 | auto& pa = portaudio::instance(); 98 | pa.open_stream(...); 99 | pa.close_stream(...); 100 | } 101 | ``` 102 | 103 | instead of the much heavier 104 | 105 | ```C++ 106 | int main() { 107 | auto& pa = portaudio::instance(); 108 | pa.Pa_OpenStream(...); 109 | pa.Pa_CloseStream(...); 110 | } 111 | ``` 112 | -------------------------------------------------------------------------------- /configurations/library-eager-abort.hpp.in: -------------------------------------------------------------------------------- 1 | #pragma once 2 | #include 3 | #include <$HEADER> 4 | 5 | #define $UCLASS_WRAP_INIT(Fun) \ 6 | m_sym_ ## Fun = m_lib.symbol(# Fun); \ 7 | assert(m_sym_ ## Fun); 8 | 9 | #define $UCLASS_WRAP_FUNCTION(Fun, PrettyFun) \ 10 | public: \ 11 | template \ 12 | auto PrettyFun(Args&&... args) -> decltype(auto) \ 13 | { \ 14 | return m_sym_ ## Fun(std::forward(args)...); \ 15 | } \ 16 | private: \ 17 | decltype(::Fun)* m_sym_ ## Fun{}; 18 | 19 | 20 | class $CLASS 21 | { 22 | public: 23 | explicit $CLASS(const char* filepath) 24 | : m_lib{filepath} 25 | { 26 | 27 | $INIT 28 | } 29 | 30 | static auto& instance() { 31 | static $CLASS c; 32 | return c; 33 | } 34 | 35 | $FUNCTIONS 36 | 37 | private: 38 | dynalizer::library m_lib; 39 | }; 40 | 41 | #undef $UCLASS_WRAP_FUNCTION 42 | #undef $UCLASS_WRAP_INIT -------------------------------------------------------------------------------- /configurations/library-eager-throw.hpp.in: -------------------------------------------------------------------------------- 1 | #pragma once 2 | #include 3 | #include <$HEADER> 4 | #include 5 | 6 | #define $UCLASS_WRAP_INIT(Fun) \ 7 | m_sym_ ## Fun = m_lib.symbol(# Fun); \ 8 | if(!m_sym_ ## Fun) \ 9 | throw std::runtime_error("Invalid symbol lookup: Fun"); 10 | 11 | #define $UCLASS_WRAP_FUNCTION(Fun, PrettyFun) \ 12 | public: \ 13 | template \ 14 | auto PrettyFun(Args&&... args) -> decltype(auto) \ 15 | { \ 16 | return m_sym_ ## Fun(std::forward(args)...); \ 17 | } \ 18 | private: \ 19 | decltype(::Fun)* m_sym_ ## Fun{}; 20 | 21 | 22 | class $CLASS 23 | { 24 | public: 25 | explicit $CLASS(const char* filepath) 26 | : m_lib{filepath} 27 | { 28 | 29 | $INIT 30 | } 31 | 32 | static auto& instance() { 33 | static $CLASS c; 34 | return c; 35 | } 36 | 37 | $FUNCTIONS 38 | 39 | private: 40 | dynalizer::library m_lib; 41 | }; 42 | 43 | #undef $UCLASS_WRAP_FUNCTION 44 | #undef $UCLASS_WRAP_INIT -------------------------------------------------------------------------------- /configurations/library-lazy-abort.hpp.in: -------------------------------------------------------------------------------- 1 | #pragma once 2 | #include 3 | #include <$HEADER> 4 | 5 | #define $UCLASS_WRAP_FUNCTION(Fun, PrettyFun) \ 6 | public: \ 7 | template \ 8 | auto PrettyFun(Args&&... args) -> decltype(auto) \ 9 | { \ 10 | if(m_sym_ ## Fun) \ 11 | { \ 12 | return m_sym_ ## Fun(std::forward(args)...); \ 13 | } \ 14 | else \ 15 | { \ 16 | m_sym_ ## Fun = m_lib.symbol(# Fun); \ 17 | assert(m_sym_ ## Fun); \ 18 | return m_sym_ ## Fun(std::forward(args)...); \ 19 | } \ 20 | } \ 21 | private: \ 22 | decltype(::Fun)* m_sym_ ## Fun{}; 23 | 24 | 25 | class $CLASS 26 | { 27 | public: 28 | explicit $CLASS(const char* filepath) 29 | : m_lib{filepath} 30 | { 31 | 32 | } 33 | 34 | static auto& instance() { 35 | static $CLASS c; 36 | return c; 37 | } 38 | 39 | $FUNCTIONS 40 | 41 | private: 42 | dynalizer::library m_lib; 43 | }; 44 | 45 | #undef $UCLASS_WRAP_FUNCTION -------------------------------------------------------------------------------- /configurations/library-lazy-throw.hpp.in: -------------------------------------------------------------------------------- 1 | #pragma once 2 | #include 3 | #include <$HEADER> 4 | #include 5 | 6 | #define $UCLASS_WRAP_FUNCTION(Fun, PrettyFun) \ 7 | public: \ 8 | template \ 9 | auto PrettyFun(Args&&... args) -> decltype(auto) \ 10 | { \ 11 | if(m_sym_ ## Fun) \ 12 | { \ 13 | return m_sym_ ## Fun(std::forward(args)...); \ 14 | } \ 15 | else \ 16 | { \ 17 | m_sym_ ## Fun = m_lib.symbol(# Fun); \ 18 | if(m_sym_ ## Fun) \ 19 | { \ 20 | return m_sym_ ## Fun(std::forward(args)...); \ 21 | } \ 22 | else \ 23 | { \ 24 | throw std::runtime_error("Invalid symbol lookup: Fun"); \ 25 | } \ 26 | } \ 27 | } \ 28 | private: \ 29 | decltype(::Fun)* m_sym_ ## Fun{}; 30 | 31 | 32 | class $CLASS 33 | { 34 | public: 35 | explicit $CLASS(const char* filepath) 36 | : m_lib{filepath} 37 | { 38 | 39 | } 40 | 41 | static auto& instance() { 42 | static $CLASS c; 43 | return c; 44 | } 45 | 46 | $FUNCTIONS 47 | 48 | private: 49 | dynalizer::library m_lib; 50 | }; 51 | 52 | #undef $UCLASS_WRAP_FUNCTION -------------------------------------------------------------------------------- /dynalizer.py: -------------------------------------------------------------------------------- 1 | import os, sys 2 | import inflection 3 | import clang.cindex 4 | import argparse 5 | 6 | def list_functions(tu, name): 7 | """List the function declarations in a C header.""" 8 | class reader: 9 | file_path = "" 10 | functions = [] 11 | 12 | def recurse(self, node): 13 | cld = node.get_children() 14 | while 1: 15 | try: 16 | c = next(cld) 17 | except StopIteration: 18 | break 19 | 20 | if(c.location.file is not None): 21 | if(c.location.file.name == self.file_path): 22 | if(c.kind == clang.cindex.CursorKind.FUNCTION_DECL): 23 | self.functions.append(c.spelling) 24 | 25 | self.recurse(c) 26 | 27 | def process(self, tu, fp): 28 | self.file_path = fp 29 | self.recurse(tu.cursor) 30 | 31 | r = reader() 32 | r.process(tu, name) 33 | return r.functions 34 | 35 | 36 | def no_prettify(str): 37 | return str 38 | def prettify(str): 39 | """Transforms an API that looks like Lib_WhateverFunc into whatever_func""" 40 | return inflection.underscore(fun.replace(prefix, '', 1)) 41 | 42 | def eager(hpp, file, functions): 43 | init = "" 44 | funlist = "" 45 | for fun in functions: 46 | pretty_fun = fun[1] 47 | init = init + " {}_WRAP_INIT({})\n".format(name.upper(), fun[0]) 48 | funlist = funlist + " {}_WRAP_FUNCTION({}, {})\n".format(name.upper(), fun[0], fun[1]) 49 | 50 | with open(hpp, 'r') as f: 51 | output_file = f.read() 52 | output_file = output_file.replace('$HEADER', header) 53 | output_file = output_file.replace('$CLASS', name) 54 | output_file = output_file.replace('$UCLASS', name.upper()) 55 | output_file = output_file.replace('$INIT', init) 56 | output_file = output_file.replace('$FUNCTIONS', funlist) 57 | 58 | return output_file 59 | 60 | def lazy(hpp, file, functions): 61 | output = "" 62 | for fun in functions: 63 | output = output + " {}_WRAP_FUNCTION({}, {})\n".format(name.upper(), fun[0], fun[1]) 64 | 65 | with open(hpp, 'r') as f: 66 | output_file = f.read() 67 | output_file = output_file.replace('$HEADER', header) 68 | output_file = output_file.replace('$CLASS', name) 69 | output_file = output_file.replace('$UCLASS', name.upper()) 70 | output_file = output_file.replace('$FUNCTIONS', output) 71 | 72 | return output_file 73 | 74 | 75 | def eager_throw(file, functions): 76 | return eager('configurations/library-eager-throw.hpp.in', file, functions) 77 | 78 | def eager_abort(file, functions): 79 | return eager('configurations/library-eager-abort.hpp.in', file, functions) 80 | 81 | 82 | def lazy_throw(file, functions): 83 | return lazy('configurations/library-lazy-throw.hpp.in', file, functions) 84 | 85 | def lazy_abort(file, functions): 86 | return lazy('configurations/library-lazy-abort.hpp.in', file, functions) 87 | 88 | 89 | parser = argparse.ArgumentParser(description='Generate a dynamic loader class for a C API.') 90 | parser.add_argument('file', type=str, help='C header to parse') 91 | parser.add_argument('name', type=str, nargs='?', help='Name to give to the class') 92 | parser.add_argument('include', type=str, nargs='?', help='Header to include') 93 | parser.add_argument('--pretty', action='store_const', const=True, default=False, help='Prettify') 94 | 95 | eagerness = parser.add_mutually_exclusive_group() 96 | eagerness.add_argument('--eager', action='store_true', default=True, help='Load symbols eagerly') 97 | eagerness.add_argument('--lazy', action='store_false', help='Load symbols lazily') 98 | 99 | reporting = parser.add_mutually_exclusive_group() 100 | reporting.add_argument('--throw', action='store_true', default=True, help='Throw on missing symbol') 101 | reporting.add_argument('--abort', action='store_false', help='Abort on missing symbol') 102 | args = parser.parse_args() 103 | 104 | index = clang.cindex.Index.create() 105 | 106 | filename = args.file 107 | name = args.name 108 | if name == None: 109 | name = os.path.splitext(os.path.basename(args.file))[0] 110 | 111 | header = args.include 112 | if header == None: 113 | include_idx = args.file.find("include/") 114 | if include_idx != -1: 115 | header = args.file[include_idx + 8:] 116 | else: 117 | header = os.path.basename(args.file) 118 | 119 | 120 | try: 121 | with open(filename, 'r') as content_file: 122 | source_file = content_file.read() 123 | 124 | tu = index.parse(filename, [], options=clang.cindex.TranslationUnit.PARSE_DETAILED_PROCESSING_RECORD) 125 | 126 | functions = list_functions(tu, filename) 127 | 128 | fun_map = [] 129 | 130 | if(args.pretty): 131 | prefix = os.path.commonprefix(functions) 132 | for f in functions: 133 | fun_map.append([f, inflection.underscore(f.replace(prefix, '', 1))]) 134 | else: 135 | for f in functions: 136 | fun_map.append([f, f]) 137 | 138 | if(args.eager): 139 | if(args.throw): 140 | output = eager_throw(filename, fun_map) 141 | elif(args.abort): 142 | output = eager_abort(filename, fun_map) 143 | elif(args.lazy): 144 | if(args.throw): 145 | output = lazy_throw(filename, fun_map) 146 | elif(args.abort): 147 | output = lazy_abort(filename, fun_map) 148 | 149 | print(output) 150 | except clang.cindex.TranslationUnitLoadError as e: 151 | print("Error: ", e.args) 152 | 153 | 154 | -------------------------------------------------------------------------------- /dynalizer/dynalizer.hpp: -------------------------------------------------------------------------------- 1 | #pragma once 2 | #if __has_include() 3 | #include 4 | #elif __has_include() 5 | #include 6 | #endif 7 | 8 | namespace dynalizer 9 | { 10 | class library 11 | { 12 | public: 13 | explicit library(const char* const so) noexcept 14 | { 15 | #ifdef _WIN32 16 | impl = (void*) LoadLibraryA(so); 17 | #else 18 | impl = dlopen(so, RTLD_LAZY|RTLD_LOCAL|RTLD_NODELETE); 19 | #endif 20 | } 21 | 22 | library(const library&) noexcept = delete; 23 | library& operator=(const library&) noexcept = delete; 24 | library(library&& other) 25 | { 26 | impl = other.impl; 27 | other.impl = nullptr; 28 | } 29 | 30 | library& operator=(library&& other) noexcept 31 | { 32 | impl = other.impl; 33 | other.impl = nullptr; 34 | return *this; 35 | } 36 | 37 | auto error() const 38 | { 39 | #ifdef _WIN32 40 | return {}; 41 | #else 42 | return dlerror(); 43 | #endif 44 | } 45 | 46 | ~library() 47 | { 48 | if(impl) 49 | { 50 | #ifdef _WIN32 51 | FreeLibrary((HMODULE)impl); 52 | #else 53 | dlclose(impl); 54 | #endif 55 | } 56 | } 57 | 58 | template 59 | T symbol(const char* const sym) const noexcept 60 | { 61 | #ifdef _WIN32 62 | return (T) GetProcAddress((HMODULE)impl, sym); 63 | #else 64 | return (T) dlsym(impl, sym); 65 | #endif 66 | } 67 | 68 | operator bool() const { return bool(impl); } 69 | 70 | private: 71 | void* impl{}; 72 | }; 73 | 74 | } 75 | --------------------------------------------------------------------------------