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https://github.com/RGBCube/serenity
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b493c6cd39
This makes DynamicLink, and in fact all Demos, build cleanly with -Wmissing-declarations. Note that this won't be necessary for 'normal' dynamic shared objects, as those usually already declare their symbols in a header file.
85 lines
3.1 KiB
C++
85 lines
3.1 KiB
C++
/*
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* Copyright (c) 2019-2020, Andrew Kaster <andrewdkaster@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/String.h>
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#include <assert.h>
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#include <stdio.h>
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char* __static_environ[] = { nullptr }; // We don't get the environment without some libc workarounds..
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// FIXME: Because we need to call printf, and we don't have access to the stout file descriptor
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// from the main executable. We need to call __libc_init....
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extern "C" void __libc_init();
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extern "C" bool __environ_is_malloced;
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class Global {
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public:
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Global(int i)
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: m_i(i)
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{
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__environ_is_malloced = false;
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environ = __static_environ;
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__libc_init();
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}
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int get_i() const { return m_i; }
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private:
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int m_i = 0;
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};
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// This object exists to call __stdio_init and __malloc_init. Also to show that global vars work
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Global g_glob { 5 };
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extern "C" {
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// Tell the compiler that these symbols might be accessed from other places:
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extern int global_lib_variable;
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void global_lib_function();
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const char* other_lib_function(int my_argument);
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int global_lib_variable = 1234;
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void global_lib_function()
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{
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printf("Hello from Dynamic Lib! g_glob::m_i == %d\n", g_glob.get_i());
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}
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const char* other_lib_function(int my_argument)
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{
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dbgprintf("Hello from Dynamic Lib, now from the debug port! g_glob::m_i == %d\n", g_glob.get_i());
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int sum = my_argument + global_lib_variable;
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// FIXME: We can't just return AK::String::format across the lib boundary here.
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// It will use malloc from our DSO's copy of LibC, and then probably be free'd into
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// the malloc of the main program which would be what they call 'very crash'.
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// Feels very Windows :)
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static String s_string;
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s_string = String::format("Here's your string! Sum of argument and global_lib_variable: %d", sum);
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return s_string.characters();
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}
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}
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