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#ifndef RUBY_ASSERT_H /*-*-C++-*-vi:se ft=cpp:*/ #define RUBY_ASSERT_H /** * @file * @author Ruby developers <ruby-core@ruby-lang.org> * @date Wed May 18 00:21:44 JST 1994 * @copyright This file is a part of the programming language Ruby. * Permission is hereby granted, to either redistribute and/or * modify this file, provided that the conditions mentioned in the * file COPYING are met. Consult the file for details. * @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are * implementation details. Don't take them as canon. They could * rapidly appear then vanish. The name (path) of this header file * is also an implementation detail. Do not expect it to persist * at the place it is now. Developers are free to move it anywhere * anytime at will. * @note To ruby-core: remember that this header can be possibly * recursively included from extension libraries written in C++. * Do not expect for instance `__VA_ARGS__` is always available. * We assume C99 for ruby itself but we don't assume languages of * extension libraries. They could be written in C++98. */ #include "ruby/internal/assume.h" #include "ruby/internal/attr/cold.h" #include "ruby/internal/attr/noreturn.h" #include "ruby/internal/cast.h" #include "ruby/internal/dllexport.h" #include "ruby/backward/2/assume.h" /* RUBY_NDEBUG is very simple: after everything described below are done, * define it with either NDEBUG is undefined (=0) or defined (=1). It is truly * subordinate. * * RUBY_DEBUG versus NDEBUG is complicated. Assertions shall be: * * | -UNDEBUG | -DNDEBUG * ---------------+----------+--------- * -URUBY_DEBUG | (*1) | disabled * -DRUBY_DEBUG=0 | disabled | disabled * -DRUBY_DEBUG=1 | enabled | (*2) * -DRUBY_DEBUG | enabled | (*2) * * where: * * - (*1): Assertions shall be silently disabled, no warnings, in favour of * commit 21991e6ca59274e41a472b5256bd3245f6596c90. * * - (*2): Compile-time warnings shall be issued. */ /** @cond INTERNAL_MACRO */ /* * Pro tip: `!!RUBY_DEBUG-1` expands to... * * - `!!(-1)` (== `!0` == `1`) when RUBY_DEBUG is defined to be empty, * - `(!!0)-1` (== `0-1` == `-1`) when RUBY_DEBUG is defined as 0, and * - `(!!n)-1` (== `1-1` == `0`) when RUBY_DEBUG is defined as something else. */ #if ! defined(RUBY_DEBUG) # define RBIMPL_RUBY_DEBUG 0 #elif !!RUBY_DEBUG-1 < 0 # define RBIMPL_RUBY_DEBUG 0 #else # define RBIMPL_RUBY_DEBUG 1 #endif /* * ISO/IEC 9899 (all past versions) says that "If NDEBUG is defined as a macro * name at the point in the source file where <assert.h> is included, ..." * which means we must not take its defined value into account. */ #if defined(NDEBUG) # define RBIMPL_NDEBUG 1 #else # define RBIMPL_NDEBUG 0 #endif /** @endcond */ /* Here we go... */ #undef RUBY_DEBUG #undef RUBY_NDEBUG #undef NDEBUG #if defined(__DOXYGEN__) # /** Define this macro when you want assertions. */ # define RUBY_DEBUG 0 # /** Define this macro when you don't want assertions. */ # define NDEBUG # /** This macro is basically the same as #NDEBUG */ # define RUBY_NDEBUG 1 #elif (RBIMPL_NDEBUG == 1) && (RBIMPL_RUBY_DEBUG == 0) # /* Assertions disabled as per request, no conflicts. */ # define RUBY_DEBUG 0 # define RUBY_NDEBUG 1 # define NDEBUG #elif (RBIMPL_NDEBUG == 0) && (RBIMPL_RUBY_DEBUG == 1) # /* Assertions enabled as per request, no conflicts. */ # define RUBY_DEBUG 1 # define RUBY_NDEBUG 0 # /* keep NDEBUG undefined */ #elif (RBIMPL_NDEBUG == 0) && (RBIMPL_RUBY_DEBUG == 0) # /* The (*1) situation in above diagram. */ # define RUBY_DEBUG 0 # define RUBY_NDEBUG 1 # define NDEBUG #elif (RBIMPL_NDEBUG == 1) && (RBIMPL_RUBY_DEBUG == 1) # /* The (*2) situation in above diagram. */ # define RUBY_DEBUG 1 # define RUBY_NDEBUG 0 # /* keep NDEBUG undefined */ # if defined(_MSC_VER) # pragma message("NDEBUG is ignored because RUBY_DEBUG>0.") # elif defined(__GNUC__) # pragma GCC warning "NDEBUG is ignored because RUBY_DEBUG>0." # else # error NDEBUG is ignored because RUBY_DEBUG>0. # endif #endif #undef RBIMPL_NDEBUG #undef RBIMPL_RUBY_DEBUG /** @cond INTERNAL_MACRO */ #define RBIMPL_ASSERT_NOTHING RBIMPL_CAST((void)0) RBIMPL_SYMBOL_EXPORT_BEGIN() RBIMPL_ATTR_NORETURN() RBIMPL_ATTR_COLD() void rb_assert_failure(const char *file, int line, const char *name, const char *expr); RBIMPL_SYMBOL_EXPORT_END() #ifdef RUBY_FUNCTION_NAME_STRING # define RBIMPL_ASSERT_FUNC RUBY_FUNCTION_NAME_STRING #else # define RBIMPL_ASSERT_FUNC RBIMPL_CAST((const char *)0) #endif /** @endcond */ /** * Prints the given message, and terminates the entire process abnormally. * * @param mesg The message to display. */ #define RUBY_ASSERT_FAIL(mesg) \ rb_assert_failure(__FILE__, __LINE__, RBIMPL_ASSERT_FUNC, mesg) /** * Asserts that the expression is truthy. If not aborts with the message. * * @param expr What supposedly evaluates to true. * @param mesg The message to display on failure. */ #define RUBY_ASSERT_MESG(expr, mesg) \ (RB_LIKELY(expr) ? RBIMPL_ASSERT_NOTHING : RUBY_ASSERT_FAIL(mesg)) /** * A variant of #RUBY_ASSERT that does not interface with #RUBY_DEBUG. * * @copydetails #RUBY_ASSERT */ #define RUBY_ASSERT_ALWAYS(expr) RUBY_ASSERT_MESG((expr), #expr) /** * Asserts that the given expression is truthy if and only if #RUBY_DEBUG is truthy. * * @param expr What supposedly evaluates to true. */ #if RUBY_DEBUG # define RUBY_ASSERT(expr) RUBY_ASSERT_MESG((expr), #expr) #else # define RUBY_ASSERT(expr) RBIMPL_ASSERT_NOTHING #endif /** * A variant of #RUBY_ASSERT that interfaces with #NDEBUG instead of * #RUBY_DEBUG. This almost resembles `assert` C standard macro, except minor * implementation details. * * @copydetails #RUBY_ASSERT */ /* Currently `RUBY_DEBUG == ! defined(NDEBUG)` is always true. There is no * difference any longer between this one and `RUBY_ASSERT`. */ #if defined(NDEBUG) # define RUBY_ASSERT_NDEBUG(expr) RBIMPL_ASSERT_NOTHING #else # define RUBY_ASSERT_NDEBUG(expr) RUBY_ASSERT_MESG((expr), #expr) #endif /** * @copydoc #RUBY_ASSERT_WHEN * @param mesg The message to display on failure. */ #if RUBY_DEBUG # define RUBY_ASSERT_MESG_WHEN(cond, expr, mesg) RUBY_ASSERT_MESG((expr), (mesg)) #else # define RUBY_ASSERT_MESG_WHEN(cond, expr, mesg) \ ((cond) ? RUBY_ASSERT_MESG((expr), (mesg)) : RBIMPL_ASSERT_NOTHING) #endif /** * A variant of #RUBY_ASSERT that asserts when either #RUBY_DEBUG or `cond` * parameter is truthy. * * @param cond Extra condition that shall hold for assertion to take effect. * @param expr What supposedly evaluates to true. */ #define RUBY_ASSERT_WHEN(cond, expr) RUBY_ASSERT_MESG_WHEN((cond), (expr), #expr) /** * This is either #RUBY_ASSERT or #RBIMPL_ASSUME, depending on #RUBY_DEBUG. * * @copydetails #RUBY_ASSERT */ #if RUBY_DEBUG # define RBIMPL_ASSERT_OR_ASSUME(expr) RUBY_ASSERT_ALWAYS(expr) #elif RBIMPL_COMPILER_BEFORE(Clang, 7, 0, 0) # /* See commit 67d259c5dccd31fe49d417fec169977712ffdf10 */ # define RBIMPL_ASSERT_OR_ASSUME(expr) RBIMPL_ASSERT_NOTHING #elif defined(RUBY_ASSERT_NOASSUME) # /* See commit d300a734414ef6de7e8eb563b7cc4389c455ed08 */ # define RBIMPL_ASSERT_OR_ASSUME(expr) RBIMPL_ASSERT_NOTHING #elif ! defined(RBIMPL_HAVE___ASSUME) # define RBIMPL_ASSERT_OR_ASSUME(expr) RBIMPL_ASSERT_NOTHING #else # define RBIMPL_ASSERT_OR_ASSUME(expr) RBIMPL_ASSUME(expr) #endif #endif /* RUBY_ASSERT_H */