1 files changed, 110 insertions, 0 deletions
diff --git a/common/almalloc.cpp b/common/almalloc.cpp
new file mode 100644
index 00000000..1b90d1c0
--- /dev/null
+++ b/common/almalloc.cpp
@@ -0,0 +1,110 @@
+
+#include "config.h"
+
+#include "almalloc.h"
+
+#include <stdlib.h>
+#include <string.h>
+#ifdef HAVE_MALLOC_H
+#include <malloc.h>
+#endif
+#ifdef HAVE_WINDOWS_H
+#include <windows.h>
+#else
+#include <unistd.h>
+#endif
+
+
+#ifdef __GNUC__
+#define LIKELY(x) __builtin_expect(!!(x), !0)
+#define UNLIKELY(x) __builtin_expect(!!(x), 0)
+#else
+#define LIKELY(x) (!!(x))
+#define UNLIKELY(x) (!!(x))
+#endif
+
+
+void *al_malloc(size_t alignment, size_t size)
+{
+#if defined(HAVE_ALIGNED_ALLOC)
+    size = (size+(alignment-1))&~(alignment-1);
+    return aligned_alloc(alignment, size);
+#elif defined(HAVE_POSIX_MEMALIGN)
+    void *ret;
+    if(posix_memalign(&ret, alignment, size) == 0)
+        return ret;
+    return NULL;
+#elif defined(HAVE__ALIGNED_MALLOC)
+    return _aligned_malloc(size, alignment);
+#else
+    char *ret = static_cast<char*>(malloc(size+alignment));
+    if(ret != NULL)
+    {
+        *(ret++) = 0x00;
+        while(((ptrdiff_t)ret&(alignment-1)) != 0)
+            *(ret++) = 0x55;
+    }
+    return ret;
+#endif
+}
+
+void *al_calloc(size_t alignment, size_t size)
+{
+    void *ret = al_malloc(alignment, size);
+    if(ret) memset(ret, 0, size);
+    return ret;
+}
+
+void al_free(void *ptr)
+{
+#if defined(HAVE_ALIGNED_ALLOC) || defined(HAVE_POSIX_MEMALIGN)
+    free(ptr);
+#elif defined(HAVE__ALIGNED_MALLOC)
+    _aligned_free(ptr);
+#else
+    if(ptr != NULL)
+    {
+        char *finder = static_cast<char*>(ptr);
+        do {
+            --finder;
+        } while(*finder == 0x55);
+        free(finder);
+    }
+#endif
+}
+
+size_t al_get_page_size(void)
+{
+    static size_t psize = 0;
+    if(UNLIKELY(!psize))
+    {
+#ifdef HAVE_SYSCONF
+#if defined(_SC_PAGESIZE)
+        if(!psize) psize = sysconf(_SC_PAGESIZE);
+#elif defined(_SC_PAGE_SIZE)
+        if(!psize) psize = sysconf(_SC_PAGE_SIZE);
+#endif
+#endif /* HAVE_SYSCONF */
+#ifdef _WIN32
+        if(!psize)
+        {
+            SYSTEM_INFO sysinfo;
+            memset(&sysinfo, 0, sizeof(sysinfo));
+
+            GetSystemInfo(&sysinfo);
+            psize = sysinfo.dwPageSize;
+        }
+#endif
+        if(!psize) psize = DEF_ALIGN;
+    }
+    return psize;
+}
+
+int al_is_sane_alignment_allocator(void)
+{
+#if defined(HAVE_ALIGNED_ALLOC) || defined(HAVE_POSIX_MEMALIGN) || defined(HAVE__ALIGNED_MALLOC)
+    return 1;
+#else
+    return 0;
+#endif
+}