diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/corelib/global/qmalloc.cpp | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/src/corelib/global/qmalloc.cpp b/src/corelib/global/qmalloc.cpp index f83cecd499..05676a0da2 100644 --- a/src/corelib/global/qmalloc.cpp +++ b/src/corelib/global/qmalloc.cpp @@ -40,6 +40,7 @@ #include "qplatformdefs.h" #include <stdlib.h> +#include <string.h> /* Define the container allocation functions in a separate file, so that our @@ -79,8 +80,6 @@ void *qMallocAligned(size_t size, size_t alignment) void *qReallocAligned(void *oldptr, size_t newsize, size_t oldsize, size_t alignment) { // fake an aligned allocation - Q_UNUSED(oldsize); - void *actualptr = oldptr ? static_cast<void **>(oldptr)[-1] : 0; if (alignment <= sizeof(void*)) { // special, fast case @@ -110,9 +109,15 @@ void *qReallocAligned(void *oldptr, size_t newsize, size_t oldsize, size_t align quintptr faked = reinterpret_cast<quintptr>(real) + alignment; faked &= ~(alignment - 1); - void **faked_ptr = reinterpret_cast<void **>(faked); + if (oldptr) { + qptrdiff oldoffset = static_cast<char *>(oldptr) - static_cast<char *>(actualptr); + qptrdiff newoffset = reinterpret_cast<char *>(faked_ptr) - static_cast<char *>(real); + if (oldoffset != newoffset) + memmove(faked_ptr, static_cast<char *>(real) + oldoffset, qMin(oldsize, newsize)); + } + // now save the value of the real pointer at faked-sizeof(void*) // by construction, alignment > sizeof(void*) and is a power of 2, so // faked-sizeof(void*) is properly aligned for a pointer |