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According to MSVC manual (*1), cl.exe can skip including a header file when that: - contains #pragma once, or - starts with #ifndef, or - starts with #if ! defined. GCC has a similar trick (*2), but it acts more stricter (e. g. there must be _no tokens_ outside of #ifndef...#endif). Sun C lacked #pragma once for a looong time. Oracle Developer Studio 12.5 finally implemented it, but we cannot assume such recent version. This changeset modifies header files so that each of them include strictly one #ifndef...#endif. I believe this is the most portable way to trigger compiler optimizations. [Bug #16770] *1: https://docs.microsoft.com/en-us/cpp/preprocessor/once *2: https://gcc.gnu.org/onlinedocs/cppinternals/Guard-Macros.html
49 lines
1.6 KiB
C++
49 lines
1.6 KiB
C++
#ifndef RUBY_VM_H /*-*-C++-*-vi:se ft=cpp:*/
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#define RUBY_VM_H 1
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/**
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* @file
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* @author $Author$
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* @date Sat May 31 15:17:36 2008
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* @copyright Copyright (C) 2008 Yukihiro Matsumoto
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* @copyright This file is a part of the programming language Ruby.
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* Permission is hereby granted, to either redistribute and/or
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* modify this file, provided that the conditions mentioned in the
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* file COPYING are met. Consult the file for details.
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*/
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#include "ruby/3/dllexport.h"
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RUBY3_SYMBOL_EXPORT_BEGIN()
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/* Place holder.
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*
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* We will prepare VM creation/control APIs on 1.9.2 or later.
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*
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*/
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/* VM type declaration */
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typedef struct rb_vm_struct ruby_vm_t;
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/* core API */
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int ruby_vm_destruct(ruby_vm_t *vm);
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/**
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* ruby_vm_at_exit registers a function _func_ to be invoked when a VM
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* passed away. Functions registered this way runs in reverse order
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* of registration, just like END {} block does. The difference is
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* its timing to be triggered. ruby_vm_at_exit functions runs when a
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* VM _passed_ _away_, while END {} blocks runs just _before_ a VM
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* _is_ _passing_ _away_.
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*
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* You cannot register a function to another VM than where you are in.
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* So where to register is intuitive, omitted. OTOH the argument
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* _func_ cannot know which VM it is in because at the time of
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* invocation, the VM has already died and there is no execution
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* context. The VM itself is passed as the first argument to it.
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*
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* @param[in] func the function to register.
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*/
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void ruby_vm_at_exit(void(*func)(ruby_vm_t *));
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RUBY3_SYMBOL_EXPORT_END()
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#endif /* RUBY_VM_H */
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