8345569: [ubsan] adjustments to filemap.cpp and virtualspace.cpp for macOS aarch64

Reviewed-by: mdoerr, lucy, dholmes

Author: MBaesken

src/hotspot/share/cds/filemap.cpp

@@ -2219,7 +2219,7 @@ address FileMapInfo::heap_region_dumptime_address() {
   assert(CDSConfig::is_using_archive(), "runtime only");
   assert(is_aligned(r->mapping_offset(), sizeof(HeapWord)), "must be");
   if (UseCompressedOops) {
-    return /*dumptime*/ narrow_oop_base() + r->mapping_offset();
+    return /*dumptime*/ (address)((uintptr_t)narrow_oop_base() + r->mapping_offset());
   } else {
     return heap_region_requested_address();
   }
@@ -2245,7 +2245,7 @@ address FileMapInfo::heap_region_requested_address() {
     // Runtime base = 0x4000 and shift is also 0. If we map this region at 0x5000, then
     // the value P can remain 0x1200. The decoded address = (0x4000 + (0x1200 << 0)) = 0x5200,
     // which is the runtime location of the referenced object.
-    return /*runtime*/ CompressedOops::base() + r->mapping_offset();
+    return /*runtime*/ (address)((uintptr_t)CompressedOops::base() + r->mapping_offset());
   } else {
     // This was the hard-coded requested base address used at dump time. With uncompressed oops,
     // the heap range is assigned by the OS so we will most likely have to relocate anyway, no matter

src/hotspot/share/memory/virtualspace.cpp

@@ -443,7 +443,7 @@ void ReservedHeapSpace::try_reserve_range(char *highest_start,
   while (attach_point >= lowest_start  &&
          attach_point <= highest_start &&  // Avoid wrap around.
          ((_base == nullptr) ||
-          (_base < aligned_heap_base_min_address || _base + size > upper_bound))) {
+          (_base < aligned_heap_base_min_address || size > (uintptr_t)(upper_bound - _base)))) {
     try_reserve_heap(size, alignment, page_size, attach_point);
     attach_point -= stepsize;
   }