mirror of
https://github.com/Mercury-Language/mercury.git
synced 2026-04-15 09:23:44 +00:00
e14f918e63
The configure script currently contains a check for the presence of the C99
header stdint.h. This is redundant since (1) *all* C compilers that are
currently capable of compiling Mercury support C99 and (2) most #includes of
stdint.h in the Mercury system are not, and have never been, protected by the
MR_HAVE_STDINT_H anyway.
configure.ac:
runtime/mercury_conf.h.in:
Do not check for stdint.h.
runtime/mercury_std.h:
Delete the one remaining use of the MR_HAVE_STDINT_H macro.
333 lines
14 KiB
C
333 lines
14 KiB
C
// vim: ts=4 sw=4 expandtab ft=c
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// Copyright (C) 1993-1995, 1997-2005, 2011-2012 The University of Melbourne.
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// Copyright (C) 2014, 2016-2019, 2021-2023 The Mercury team.
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// This file is distributed under the terms specified in COPYING.LIB.
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// std.h - "standard" [sic] definitions for C:
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// MR_bool, MR_TRUE, MR_FALSE, MR_min(), MR_max(), MR_streq(), etc.
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#ifndef MERCURY_STD_H
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#define MERCURY_STD_H
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// We include mercury_regs.h FIRST in order to ensure that
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// we define any global register variables BEFORE any functions,
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// even if the system libraries we include below it define any functions.
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#include "mercury_regs.h"
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#include <stdint.h>
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// On Windows we need to define _CRT_RAND_S *before* stdlib.h is included,
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// otherwise the declaration for rand_s() will not be visible.
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//
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#if defined(MR_WIN32) && !defined(_CRT_RAND_S)
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#define _CRT_RAND_S
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#endif
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#include <stdlib.h> // for size_t
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#include <assert.h> // for assert()
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#include <errno.h> // for EINTR
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#include <ctype.h> // for isalnum(), etc.
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// The boolean type, MR_bool, with constants MR_TRUE and MR_FALSE.
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//
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// We use `int' rather than `char' for MR_bool, because GCC has problems
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// optimizing tail calls for functions that return types smaller than `int'.
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// In most cases, `int' is more efficient anyway.
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// The only exception is that in some cases it is more important to optimize
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// space rather than time; in those (rare) cases, you can use `MR_small_bool'
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// instead of `MR_bool'.
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typedef int MR_bool;
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typedef char MR_small_bool;
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// The values of MR_TRUE and MR_FALSE should correspond with the representation
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// of the Mercury standard library type bool.bool, so that they can be used as
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// values for bool arguments of exported Mercury procs.
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#define MR_TRUE 1
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#define MR_FALSE 0
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#define MR_YES MR_TRUE
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#define MR_NO MR_FALSE
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#define MR_max(a, b) ((a) > (b) ? (a) : (b))
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#define MR_min(a, b) ((a) < (b) ? (a) : (b))
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// The ANSI C isalnum(), etc. macros require that the argument be cast to
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// `unsigned char'; if you pass a signed char, the behaviour is undefined.
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// Hence we define `MR_' versions of these that do the cast -- you should
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// make sure to always use the `MR_' versions rather than the standard ones.
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#define MR_isupper(c) isupper((unsigned char) (c))
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#define MR_islower(c) islower((unsigned char) (c))
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#define MR_isalpha(c) isalpha((unsigned char) (c))
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#define MR_isalnum(c) isalnum((unsigned char) (c))
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#define MR_isdigit(c) isdigit((unsigned char) (c))
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#define MR_isspace(c) isspace((unsigned char) (c))
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#define MR_isalnumunder(c) (isalnum((unsigned char) (c)) || (c) == '_')
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#define MR_streq(s1, s2) (strcmp(s1, s2) == 0)
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#define MR_strdiff(s1, s2) (strcmp(s1, s2) != 0)
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#define MR_strtest(s1, s2) (strcmp(s1, s2))
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#define MR_strneq(s1, s2, n) (strncmp(s1, s2, n) == 0)
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#define MR_strndiff(s1, s2, n) (strncmp(s1, s2, n) != 0)
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#define MR_strntest(s1, s2, n) (strncmp(s1, s2, n))
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#define MR_ungetchar(c) ungetc(c, stdin)
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// For speed, turn assertions off, unless debugging of the runtime is enabled.
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#ifdef MR_DEBUG_THE_RUNTIME
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#define MR_assert(ASSERTION) assert(ASSERTION)
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#elif defined(MR_MSVC)
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// This marks an MR_assert(0) as an unreachable branch. This also silences
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// warnings about unused variables, and also can improve optimization.
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#define MR_assert(ASSERTION) __assume(ASSERTION)
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#else
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// Using sizeof ensures that the argument to MR_assert is valid, but does
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// not actually execute any code. This helps prevent bitrot when code is
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// not tested with assertions enabled.
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#define MR_assert(ASSERTION) ((void) sizeof(ASSERTION))
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#endif
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////////////////////////////////////////////////////////////////////////////
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#ifdef EINTR
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#define MR_is_eintr(x) ((x) == EINTR)
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#else
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#define MR_is_eintr(x) MR_FALSE
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#endif
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////////////////////////////////////////////////////////////////////////////
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// Macros for inlining.
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//
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// Inlining is treated differently by C++, C99, and GNU C.
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// We also need to make it work for C89, which doesn't have
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// any explicit support for inlining.
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//
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// To make a function inline, you should declare it as either
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// `MR_INLINE', `MR_EXTERN_INLINE', or `MR_STATIC_INLINE'.
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// You should not use `extern' or `static' in combination with these macros.
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//
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// `MR_STATIC_INLINE' should be used for functions that are defined and
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// used only in a single translation unit (i.e. a single C source file).
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//
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// If the inline function is to be used from more than one translation unit,
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// then the function definition (not just declaration) should go in
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// a header file, and you should use either MR_INLINE or MR_EXTERN_INLINE;
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// the difference between these two is explained below.
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//
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// MR_INLINE creates an inline definition of the function, and
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// if needed it also creates an out-of-line definition of the function
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// for the current translation unit, in case the function can't be inlined
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// (e.g. because the function's address was taken, or because the
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// file is compiled with the C compiler's optimizations turned off.)
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// For C++, these definitions will be shared between different
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// compilation units, but for C, each compilation unit that needs
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// an out-of-line definition will gets its own definition.
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// Generally that is not much of a problem, but if the C compiler
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// doesn't optimize away such out-of-line definitions when they're
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// not needed, this can get quite bad.
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//
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// MR_EXTERN_INLINE creates an inline definition of the function,
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// but it does NOT guarantee to create an out-of-line definition,
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// even if one might be needed. You need to explicitly provide
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// an out-of-line definition for the function in one of the C files.
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// This should be done using the MR_OUTLINE_DEFN(decl,body) macro,
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// e.g. `MR_OUTLINE_DEFN(int foo(int x), { return x; })'.
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//
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// The advantage of MR_EXTERN_INLINE is that it is more code-space-efficient,
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// especially in the case where you are compiling with C compiler optimizations
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// turned off.
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//
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// It is OK to take the address of an inline function,
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// but you should not assume that the address of a function declared
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// MR_INLINE or MR_EXTERN_INLINE will be the same in all translation units.
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#if defined(__cplusplus)
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// C++
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#define MR_STATIC_INLINE static inline
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#define MR_INLINE inline
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#define MR_EXTERN_INLINE inline
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#define MR_OUTLINE_DEFN(DECL,BODY)
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#elif defined(MR_CLANG)
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#if __STDC_VERSION__ >= 199901
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// C99 style inlining.
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#define MR_STATIC_INLINE static inline
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#define MR_INLINE static inline
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#define MR_EXTERN_INLINE inline
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#define MR_OUTLINE_DEFN(DECL,BODY) extern DECL;
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#else
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// C89: note that by default we use clang in C99 mode, so this alternative
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// will only be used if user explicitly sets -std to use something prior
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// to C99.
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#define MR_STATIC_INLINE static
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#define MR_INLINE static
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#define MR_EXTERN_INLINE static
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#define MR_OUTLINE_DEFN(DECL,BODY)
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#endif
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#elif defined(MR_GNUC)
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// GNU C: in (GNU) C99 or later mode GCC will use C99 style
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// inline functions; otherwise GNU style inline functions will
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// will be used.
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#if defined(__GNUC_STDC_INLINE__)
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// C99 style inlining.
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#define MR_STATIC_INLINE static inline
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#define MR_INLINE static inline
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#define MR_EXTERN_INLINE inline
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#define MR_OUTLINE_DEFN(DECL,BODY) extern DECL;
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#else
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// GNU C90 style inlining.
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#define MR_STATIC_INLINE static __inline__
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#define MR_INLINE static __inline__
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#define MR_EXTERN_INLINE extern __inline__
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#define MR_OUTLINE_DEFN(DECL,BODY) DECL BODY
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#endif // ! __GNUC_STDC_INLINE
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#elif defined(MR_MSVC)
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#define MR_STATIC_INLINE static __inline
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#define MR_INLINE static __inline
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#define MR_EXTERN_INLINE extern __inline
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#define MR_OUTLINE_DEFN(DECL, BODY)
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#elif __STDC_VERSION__ >= 199901
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// C99
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#define MR_STATIC_INLINE static inline
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#define MR_INLINE static inline
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#define MR_EXTERN_INLINE inline
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#define MR_OUTLINE_DEFN(DECL,BODY) extern DECL;
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#else
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// C89
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#define MR_STATIC_INLINE static
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#define MR_INLINE static
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#define MR_EXTERN_INLINE static
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#define MR_OUTLINE_DEFN(DECL,BODY)
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#endif
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////////////////////////////////////////////////////////////////////////////
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// A macro for declaring functions that never return.
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#if defined(MR_GNUC) || defined(MR_CLANG)
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#define MR_NO_RETURN(x) x __attribute__((noreturn))
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#elif defined(MR_MSVC)
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#define MR_NO_RETURN(x) __declspec(noreturn) x
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#else
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#define MR_NO_RETURN(x) x
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#endif
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////////////////////////////////////////////////////////////////////////////
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// MR_CALL:
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// A macro for specifying the calling convention to use for C functions
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// generated by the MLDS back-end (and for builtins such as unification
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// which must use the same calling convention). This can expand to whatever
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// implementation-specific magic is required to tell the C compiler to use
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// a different calling convention.
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//
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// If MR_USE_REGPARM was defined, and we were using gcc on x86,
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// then we USED to use a non-standard but more efficient calling convention
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// that passes parameters in registers. Otherwise we just used the default
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// C calling convention.
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//
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// However, since 32-bit x86s are rare these days, and this non-standard
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// calling convention is *slower* on x86/64 platforms than the standard one,
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// we don't do this anymore.
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#define MR_CALL
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////////////////////////////////////////////////////////////////////////////
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// C preprocessor tricks.
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// Convert a macro to a string.
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#define MR_STRINGIFY(x) MR_STRINGIFY_2(x)
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#define MR_STRINGIFY_2(x) #x
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// Paste some macros together.
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#define MR_PASTE2(a,b) MR_PASTE2_2(a,b)
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#define MR_PASTE2_2(a,b) a##b
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#define MR_PASTE3(a,b,c) MR_PASTE3_2(a,b,c)
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#define MR_PASTE3_2(a,b,c) a##b##c
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#define MR_PASTE4(a,b,c,d) MR_PASTE4_2(a,b,c,d)
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#define MR_PASTE4_2(a,b,c,d) a##b##c##d
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#define MR_PASTE5(a,b,c,d,e) MR_PASTE5_2(a,b,c,d,e)
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#define MR_PASTE5_2(a,b,c,d,e) a##b##c##d##e
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#define MR_PASTE6(a,b,c,d,e,f) MR_PASTE6_2(a,b,c,d,e,f)
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#define MR_PASTE6_2(a,b,c,d,e,f) a##b##c##d##e##f
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#define MR_PASTE7(a,b,c,d,e,f,g) MR_PASTE7_2(a,b,c,d,e,f,g)
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#define MR_PASTE7_2(a,b,c,d,e,f,g) a##b##c##d##e##f##g
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#define MR_PASTE8(a,b,c,d,e,f,g,h) MR_PASTE8_2(a,b,c,d,e,f,g,h)
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#define MR_PASTE8_2(a,b,c,d,e,f,g,h) a##b##c##d##e##f##g##h
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#define MR_PASTE9(a,b,c,d,e,f,g,h,i) MR_PASTE9_2(a,b,c,d,e,f,g,h,i)
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#define MR_PASTE9_2(a,b,c,d,e,f,g,h,i) a##b##c##d##e##f##g##h##i
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#define MR_PASTE10(a,b,c,d,e,f,g,h,i,j) MR_PASTE10_2(a,b,c,d,e,f,g,h,i,j)
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#define MR_PASTE10_2(a,b,c,d,e,f,g,h,i,j) a##b##c##d##e##f##g##h##i##j
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#define MR_PASTE11(a,b,c,d,e,f,g,h,i,j,k) \
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MR_PASTE11_2(a,b,c,d,e,f,g,h,i,j,k)
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#define MR_PASTE11_2(a,b,c,d,e,f,g,h,i,j,k) \
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a##b##c##d##e##f##g##h##i##j##k
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#define MR_PASTE12(a,b,c,d,e,f,g,h,i,j,k,l) \
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MR_PASTE12_2(a,b,c,d,e,f,g,h,i,j,k,l)
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#define MR_PASTE12_2(a,b,c,d,e,f,g,h,i,j,k,l) \
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a##b##c##d##e##f##g##h##i##j##k##l
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// MR_CHECK_EXPR_TYPE(expr, type):
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// This macro checks that the given expression has a type
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// which is compatible with (assignable to) the specified type,
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// forcing a compile error if it does not.
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// It does not evaluate the expression.
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// Note that the specified type must be a complete type,
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// i.e. it must not be a pointer to a struct which has not been defined.
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//
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// This macro is useful for defining type-safe function-like macros.
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//
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// The implementation of this macro looks like it dereferences
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// a null pointer, but because that code is inside sizeof(), it will
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// not get executed; the compiler will instead just check that it is
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// type-correct.
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#define MR_CHECK_EXPR_TYPE(expr, type) \
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((void) sizeof(* (type *) NULL = (expr)))
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// MR_STATIC_ASSERT(module, expr):
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// Assert at compile time that the given expression is true.
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// A named bit-field may not have zero width.
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#define MR_STATIC_ASSERT(module, expr) \
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struct MR_PASTE4(static_assert_, module, _line_, __LINE__) \
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{ unsigned int bf : !!(expr); }
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////////////////////////////////////////////////////////////////////////////
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#define MR_SORRY(msg) MR_fatal_error("Sorry, not yet implemented: " msg);
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////////////////////////////////////////////////////////////////////////////
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// MR_IF is for writing if-then-elses that must expand to expressions, not
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// statements.
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#define MR_IF(cond, val) ((cond) ? ((val), (void) 0) : (void) 0)
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////////////////////////////////////////////////////////////////////////////
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// This macro is needed by both mercury_float.h and mercury_int.h.
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#if defined(MR_DEBUG_DWORD_ALIGNMENT) && \
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(defined(MR_GNUC) || defined(MR_CLANG))
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#define MR_dword_ptr(ptr) \
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({ \
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MR_Word __addr = (MR_Word) (ptr); \
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assert((__addr % 8) == 0); \
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/* return */ (void *) __addr; \
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})
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#else
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#define MR_dword_ptr(ptr) ((void *) (ptr))
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#endif
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////////////////////////////////////////////////////////////////////////////
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#endif // not MERCURY_STD_H
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