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#ifndef RBIMPL_XMALLOC_H /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_XMALLOC_H
/**
* @file
* @author Ruby developers <ruby-core@ruby-lang.org>
* @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.
* @brief Declares ::ruby_xmalloc().
*/
#include "ruby/internal/config.h"
#ifdef STDC_HEADERS
# include <stddef.h>
#endif
#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#endif
#include "ruby/internal/attr/alloc_size.h"
#include "ruby/internal/attr/nodiscard.h"
#include "ruby/internal/attr/noexcept.h"
#include "ruby/internal/attr/restrict.h"
#include "ruby/internal/attr/returns_nonnull.h"
#include "ruby/internal/dllexport.h"
/**
* @private
* @warning Do not touch this macro.
* @warning It is an implementation detail.
* @warning It was a failure at the first place to let you know about it.
* @warning The value of this macro must match for ruby itself and all
* extension libraries, otherwise serious memory corruption shall
* occur.
*/
#ifndef USE_GC_MALLOC_OBJ_INFO_DETAILS
# define USE_GC_MALLOC_OBJ_INFO_DETAILS 0
#endif
#define xmalloc ruby_xmalloc /**< @old{ruby_xmalloc} */
#define xmalloc2 ruby_xmalloc2 /**< @old{ruby_xmalloc2} */
#define xcalloc ruby_xcalloc /**< @old{ruby_xcalloc} */
#define xrealloc ruby_xrealloc /**< @old{ruby_xrealloc} */
#define xrealloc2 ruby_xrealloc2 /**< @old{ruby_xrealloc2} */
#define xfree ruby_xfree /**< @old{ruby_xfree} */
RBIMPL_SYMBOL_EXPORT_BEGIN()
RBIMPL_ATTR_NODISCARD()
RBIMPL_ATTR_RESTRICT()
RBIMPL_ATTR_RETURNS_NONNULL()
RBIMPL_ATTR_ALLOC_SIZE((1))
/**
* Allocates a storage instance. It is largely the same as system malloc(),
* except:
*
* - It raises Ruby exceptions instead of returning NULL, and
* - In case of `ENOMEM` it tries to GC to make some room.
*
* @param[in] size Requested amount of memory.
* @exception rb_eNoMemError No space left for `size` bytes allocation.
* @return A valid pointer to an allocated storage instance; which has at
* least `size` bytes width, with appropriate alignment detected by
* the underlying malloc() routine.
* @note It doesn't return NULL.
* @note Unlike some malloc() implementations, it allocates something and
* returns a meaningful value even when `size` is equal to zero.
* @warning The return value shall be invalidated exactly once by either
* ruby_xfree(), ruby_xrealloc(), or ruby_xrealloc2(). It is a
* failure to pass it to system free(), because the system and Ruby
* might or might not share the same malloc() implementation.
*/
void *ruby_xmalloc(size_t size)
RBIMPL_ATTR_NOEXCEPT(malloc(size))
;
RBIMPL_ATTR_NODISCARD()
RBIMPL_ATTR_RESTRICT()
RBIMPL_ATTR_RETURNS_NONNULL()
RBIMPL_ATTR_ALLOC_SIZE((1,2))
/**
* Identical to ruby_xmalloc(), except it allocates `nelems` * `elemsiz` bytes.
* This is needed because the multiplication could integer overflow. On such
* situations Ruby does not try to allocate at all but raises Ruby level
* exceptions instead. If there is no integer overflow the behaviour is
* exactly the same as `ruby_xmalloc(nelems*elemsiz)`.
*
* @param[in] nelems Number of elements.
* @param[in] elemsiz Size of an element.
* @exception rb_eNoMemError No space left for allocation.
* @exception rb_eArgError `nelems` * `elemsiz` would overflow.
* @return A valid pointer to an allocated storage instance; which has at
* least `nelems` * `elemsiz` bytes width, with appropriate
* alignment detected by the underlying malloc() routine.
* @note It doesn't return NULL.
* @note Unlike some malloc() implementations, it allocates something and
* returns a meaningful value even when `nelems` or `elemsiz` or
* both are zero.
* @warning The return value shall be invalidated exactly once by either
* ruby_xfree(), ruby_xrealloc(), or ruby_xrealloc2(). It is a
* failure to pass it to system free(), because the system and Ruby
* might or might not share the same malloc() implementation.
*/
void *ruby_xmalloc2(size_t nelems, size_t elemsiz)
RBIMPL_ATTR_NOEXCEPT(malloc(nelems * elemsiz))
;
RBIMPL_ATTR_NODISCARD()
RBIMPL_ATTR_RESTRICT()
RBIMPL_ATTR_RETURNS_NONNULL()
RBIMPL_ATTR_ALLOC_SIZE((1,2))
/**
* Identical to ruby_xmalloc2(), except it returns a zero-filled storage
* instance. It can also be seen as a routine identical to ruby_xmalloc(),
* except it calls calloc() instead of malloc().
*
* @param[in] nelems Number of elements.
* @param[in] elemsiz Size of an element.
* @exception rb_eNoMemError No space left for allocation.
* @exception rb_eArgError `nelems` * `elemsiz` would overflow.
* @return A valid pointer to an allocated storage instance; which has at
* least `nelems` * `elemsiz` bytes width, with appropriate
* alignment detected by the underlying calloc() routine.
* @post The returned storage instance is filled with zeros.
* @note It doesn't return NULL.
* @note Unlike some calloc() implementations, it allocates something and
* returns a meaningful value even when `nelems` or `elemsiz` or
* both are zero.
* @warning The return value shall be invalidated exactly once by either
* ruby_xfree(), ruby_xrealloc(), or ruby_xrealloc2(). It is a
* failure to pass it to system free(), because the system and Ruby
* might or might not share the same malloc() implementation.
*/
void *ruby_xcalloc(size_t nelems, size_t elemsiz)
RBIMPL_ATTR_NOEXCEPT(calloc(nelems, elemsiz))
;
RBIMPL_ATTR_NODISCARD()
RBIMPL_ATTR_RETURNS_NONNULL()
RBIMPL_ATTR_ALLOC_SIZE((2))
/**
* Resize the storage instance.
*
* @param[in] ptr A valid pointer to a storage instance that was
* previously returned from either:
* - ruby_xmalloc(),
* - ruby_xmalloc2(),
* - ruby_xcalloc(),
* - ruby_xrealloc(), or
* - ruby_xrealloc2().
* @param[in] newsiz Requested new amount of memory.
* @exception rb_eNoMemError No space left for `newsiz` bytes allocation.
* @return A valid pointer to a (possibly newly allocated) storage
* instance; which has at least `newsiz` bytes width, with
* appropriate alignment detected by the underlying realloc()
* routine.
* @pre The passed pointer must point to a valid live storage instance.
* It is a failure to pass an already freed pointer.
* @post In case the function returns the passed pointer as-is, the
* storage instance that the pointer holds is either grown or
* shrunken to have at least `newsiz` bytes. Otherwise a valid
* pointer to a newly allocated storage instance is returned. In
* this case `ptr` is invalidated as if it was passed to
* ruby_xfree().
* @note It doesn't return NULL.
* @warning Unlike some realloc() implementations, passing zero to `newsiz`
* is not the same as calling ruby_xfree(), because this function
* never returns NULL. Something meaningful still returns then.
* @warning It is a failure not to check the return value. Do not assume
* anything on it. It could be either identical to, or distinct
* form the passed argument.
* @warning Do not assume anything on the alignment of the return value.
* There is no guarantee that it inherits the passed argument's
* one.
* @warning The return value shall be invalidated exactly once by either
* ruby_xfree(), ruby_xrealloc(), or ruby_xrealloc2(). It is a
* failure to pass it to system free(), because the system and Ruby
* might or might not share the same malloc() implementation.
*/
void *ruby_xrealloc(void *ptr, size_t newsiz)
RBIMPL_ATTR_NOEXCEPT(realloc(ptr, newsiz))
;
RBIMPL_ATTR_NODISCARD()
RBIMPL_ATTR_RETURNS_NONNULL()
RBIMPL_ATTR_ALLOC_SIZE((2,3))
/**
* Identical to ruby_xrealloc(), except it resizes the given storage instance
* to `newelems` * `newsiz` bytes. This is needed because the multiplication
* could integer overflow. On such situations Ruby does not try to touch the
* contents of argument pointer at all but raises Ruby level exceptions
* instead. If there is no integer overflow the behaviour is exactly the same
* as `ruby_xrealloc(ptr,nelems*elemsiz)`.
*
* This is roughly the same as reallocarray() function that OpenBSD
* etc. provides, but also interacts with our GC.
*
* @param[in] ptr A valid pointer to a storage instance that was
* previously returned from either:
* - ruby_xmalloc(),
* - ruby_xmalloc2(),
* - ruby_xcalloc(),
* - ruby_xrealloc(), or
* - ruby_xrealloc2().
* @param[in] newelems Requested new number of elements.
* @param[in] newsiz Requested new size of each element.
* @exception rb_eNoMemError No space left for allocation.
* @exception rb_eArgError `newelems` * `newsiz` would overflow.
* @return A valid pointer to a (possibly newly allocated) storage
* instance; which has at least `newelems` * `newsiz` bytes width,
* with appropriate alignment detected by the underlying realloc()
* routine.
* @pre The passed pointer must point to a valid live storage instance.
* It is a failure to pass an already freed pointer.
* @post In case the function returns the passed pointer as-is, the
* storage instance that the pointer holds is either grown or
* shrunken to have at least `newelems` * `newsiz` bytes.
* Otherwise a valid pointer to a newly allocated storage instance
* is returned. In this case `ptr` is invalidated as if it was
* passed to ruby_xfree().
* @note It doesn't return NULL.
* @warning Unlike some realloc() implementations, passing zero to either
* `newelems` or `elemsiz` are not the same as calling
* ruby_xfree(), because this function never returns NULL.
* Something meaningful still returns then.
* @warning It is a failure not to check the return value. Do not assume
* anything on it. It could be either identical to, or distinct
* form the passed argument.
* @warning Do not assume anything on the alignment of the return value.
* There is no guarantee that it inherits the passed argument's
* one.
* @warning The return value shall be invalidated exactly once by either
* ruby_xfree(), ruby_xrealloc(), or ruby_xrealloc2(). It is a
* failure to pass it to system free(), because the system and Ruby
* might or might not share the same malloc() implementation.
*/
void *ruby_xrealloc2(void *ptr, size_t newelems, size_t newsiz)
RBIMPL_ATTR_NOEXCEPT(realloc(ptr, newelems * newsiz))
;
/**
* Deallocates a storage instance.
*
* @param[out] ptr Either
* - NULL, or
* - a valid pointer previously returned from one of:
* - ruby_xmalloc(),
* - ruby_xmalloc2(),
* - ruby_xcalloc(),
* - ruby_xrealloc(), or
* - ruby_xrealloc2().
* @pre The passed pointer must point to a valid live storage instance.
* It is a failure to pass an already freed pointer.
* @post The storage instance pointed by the passed pointer gets
* invalidated; it is no longer addressable.
* @warning Every single storage instance that was previously allocated by
* either ruby_xmalloc(), ruby_xmalloc2(), ruby_xcalloc(),
* ruby_xrealloc(), or ruby_xrealloc2() shall be invalidated
* exactly once by either passing it to ruby_xfree(), or passing
* it to either ruby_xrealloc(), ruby_xrealloc2() then check the
* return value for invalidation.
* @warning Do not pass anything other than pointers described above. For
* instance pointers returned from malloc() or mmap() shall not be
* passed to this function, because the underlying memory
* management mechanism could differ.
* @warning Do not pass any invalid pointers to this function e.g. by
* calling it twice with a same argument.
*/
void ruby_xfree(void *ptr)
RBIMPL_ATTR_NOEXCEPT(free(ptr))
;
#if USE_GC_MALLOC_OBJ_INFO_DETAILS
# define ruby_xmalloc(s1) ruby_xmalloc_with_location(s1, __FILE__, __LINE__)
# define ruby_xmalloc2(s1, s2) ruby_xmalloc2_with_location(s1, s2, __FILE__, __LINE__)
# define ruby_xcalloc(s1, s2) ruby_xcalloc_with_location(s1, s2, __FILE__, __LINE__)
# define ruby_xrealloc(ptr, s1) ruby_xrealloc_with_location(ptr, s1, __FILE__, __LINE__)
# define ruby_xrealloc2(ptr, s1, s2) ruby_xrealloc2_with_location(ptr, s1, s2, __FILE__, __LINE__)
RBIMPL_ATTR_NODISCARD()
RBIMPL_ATTR_RESTRICT()
RBIMPL_ATTR_RETURNS_NONNULL()
RBIMPL_ATTR_ALLOC_SIZE((1))
void *ruby_xmalloc_body(size_t size)
RBIMPL_ATTR_NOEXCEPT(malloc(size))
;
RBIMPL_ATTR_NODISCARD()
RBIMPL_ATTR_RESTRICT()
RBIMPL_ATTR_RETURNS_NONNULL()
RBIMPL_ATTR_ALLOC_SIZE((1,2))
void *ruby_xmalloc2_body(size_t nelems, size_t elemsiz)
RBIMPL_ATTR_NOEXCEPT(malloc(nelems * elemsiz))
;
RBIMPL_ATTR_NODISCARD()
RBIMPL_ATTR_RESTRICT()
RBIMPL_ATTR_RETURNS_NONNULL()
RBIMPL_ATTR_ALLOC_SIZE((1,2))
void *ruby_xcalloc_body(size_t nelems, size_t elemsiz)
RBIMPL_ATTR_NOEXCEPT(calloc(nelems, elemsiz))
;
RBIMPL_ATTR_NODISCARD()
RBIMPL_ATTR_RETURNS_NONNULL()
RBIMPL_ATTR_ALLOC_SIZE((2))
void *ruby_xrealloc_body(void *ptr, size_t newsiz)
RBIMPL_ATTR_NOEXCEPT(realloc(ptr, newsiz))
;
RBIMPL_ATTR_NODISCARD()
RBIMPL_ATTR_RETURNS_NONNULL()
RBIMPL_ATTR_ALLOC_SIZE((2,3))
void *ruby_xrealloc2_body(void *ptr, size_t newelems, size_t newsiz)
RBIMPL_ATTR_NOEXCEPT(realloc(ptr, newelems * newsiz))
;
RUBY_EXTERN const char *ruby_malloc_info_file;
RUBY_EXTERN int ruby_malloc_info_line;
static inline void *
ruby_xmalloc_with_location(size_t s, const char *file, int line)
{
void *ptr;
ruby_malloc_info_file = file;
ruby_malloc_info_line = line;
ptr = ruby_xmalloc_body(s);
ruby_malloc_info_file = NULL;
return ptr;
}
static inline void *
ruby_xmalloc2_with_location(size_t s1, size_t s2, const char *file, int line)
{
void *ptr;
ruby_malloc_info_file = file;
ruby_malloc_info_line = line;
ptr = ruby_xmalloc2_body(s1, s2);
ruby_malloc_info_file = NULL;
return ptr;
}
static inline void *
ruby_xcalloc_with_location(size_t s1, size_t s2, const char *file, int line)
{
void *ptr;
ruby_malloc_info_file = file;
ruby_malloc_info_line = line;
ptr = ruby_xcalloc_body(s1, s2);
ruby_malloc_info_file = NULL;
return ptr;
}
static inline void *
ruby_xrealloc_with_location(void *ptr, size_t s, const char *file, int line)
{
void *rptr;
ruby_malloc_info_file = file;
ruby_malloc_info_line = line;
rptr = ruby_xrealloc_body(ptr, s);
ruby_malloc_info_file = NULL;
return rptr;
}
static inline void *
ruby_xrealloc2_with_location(void *ptr, size_t s1, size_t s2, const char *file, int line)
{
void *rptr;
ruby_malloc_info_file = file;
ruby_malloc_info_line = line;
rptr = ruby_xrealloc2_body(ptr, s1, s2);
ruby_malloc_info_file = NULL;
return rptr;
}
#endif
RBIMPL_SYMBOL_EXPORT_END()
#endif /* RBIMPL_XMALLOC_H */
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