Expose mi prefixed public standard implementations of various posix, unix, and c++ allocation functions. See issue #75

src/alloc-posix.c

@@ -0,0 +1,82 @@
+/* ----------------------------------------------------------------------------
+Copyright (c) 2018,2019, Microsoft Research, Daan Leijen
+This is free software; you can redistribute it and/or modify it under the
+terms of the MIT license. A copy of the license can be found in the file
+"LICENSE" at the root of this distribution.
+-----------------------------------------------------------------------------*/
+
+// ------------------------------------------------------------------------
+// mi prefixed publi definitions of various Posix, Unix, and C++ functions
+// for convenience and used when overriding these functions.
+// ------------------------------------------------------------------------
+
+#include "mimalloc.h"
+#include "mimalloc-internal.h"
+
+// ------------------------------------------------------
+// Posix & Unix functions definitions
+// ------------------------------------------------------
+
+#include <errno.h>
+
+#ifndef EINVAL
+#define EINVAL 22
+#endif
+#ifndef ENOMEM
+#define ENOMEM 12
+#endif
+
+
+size_t mi_malloc_size(void* p) mi_attr_noexcept {
+  return mi_usable_size(p);
+}
+
+size_t mi_malloc_usable_size(void *p) mi_attr_noexcept {
+  return mi_usable_size(p);
+}
+
+void mi_cfree(void* p) mi_attr_noexcept {
+  mi_free(p);
+}
+
+int mi_posix_memalign(void** p, size_t alignment, size_t size) mi_attr_noexcept {
+  // Note: The spec dictates we should not modify `*p` on an error. (issue#27)
+  // <http://man7.org/linux/man-pages/man3/posix_memalign.3.html>
+  if (p == NULL) return EINVAL;
+  if (alignment % sizeof(void*) != 0) return EINVAL;      // natural alignment
+  if ((alignment & (alignment - 1)) != 0) return EINVAL;  // not a power of 2
+  void* q = mi_malloc_aligned(size, alignment);
+  if (q==NULL && size != 0) return ENOMEM;
+  *p = q;
+  return 0;
+}
+
+int mi__posix_memalign(void** p, size_t alignment, size_t size) mi_attr_noexcept {
+  return mi_posix_memalign(p, alignment, size);
+}
+
+void* mi_memalign(size_t alignment, size_t size) mi_attr_noexcept {
+  return mi_malloc_aligned(size, alignment);
+}
+
+void* mi_valloc(size_t size) mi_attr_noexcept {
+  return mi_malloc_aligned(size, _mi_os_page_size());
+}
+
+void* mi_pvalloc(size_t size) mi_attr_noexcept {
+  size_t psize = _mi_os_page_size();
+  if (size >= SIZE_MAX - psize) return NULL; // overflow
+  size_t asize = ((size + psize - 1) / psize) * psize;
+  return mi_malloc_aligned(asize, psize);
+}
+
+void* mi_aligned_alloc(size_t alignment, size_t size) mi_attr_noexcept {
+  return mi_malloc_aligned(size, alignment);
+}
+
+void* mi_reallocarray( void* p, size_t count, size_t size ) mi_attr_noexcept {  // BSD
+  void* newp = mi_reallocn(p,count,size);
+  if (newp==NULL) errno = ENOMEM;
+  return newp;
+}
+