828 }
829 st->cr();
830 }
831
832 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
833
834 assert(alignment <= Arguments::conservative_max_heap_alignment(),
835 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
836 alignment, Arguments::conservative_max_heap_alignment());
837
838 size_t total_reserved = align_size_up(heap_size, alignment);
839 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
840 "heap size is too big for compressed oops");
841
842 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size());
843 assert(!UseLargePages
844 || UseParallelGC
845 || use_large_pages, "Wrong alignment to use large pages");
846
847 // Now create the space.
848 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages);
849
850 if (total_rs.is_reserved()) {
851 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
852 "must be exactly of required size and alignment");
853 // We are good.
854
855 if (UseCompressedOops) {
856 // Universe::initialize_heap() will reset this to NULL if unscaled
857 // or zero-based narrow oops are actually used.
858 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
859 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
860 }
861
862 return total_rs;
863 }
864
865 vm_exit_during_initialization(
866 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
867 total_reserved/K));
868
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828 }
829 st->cr();
830 }
831
832 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
833
834 assert(alignment <= Arguments::conservative_max_heap_alignment(),
835 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
836 alignment, Arguments::conservative_max_heap_alignment());
837
838 size_t total_reserved = align_size_up(heap_size, alignment);
839 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
840 "heap size is too big for compressed oops");
841
842 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size());
843 assert(!UseLargePages
844 || UseParallelGC
845 || use_large_pages, "Wrong alignment to use large pages");
846
847 // Now create the space.
848 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, HeapDir);
849
850 if (total_rs.is_reserved()) {
851 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
852 "must be exactly of required size and alignment");
853 // We are good.
854
855 if (UseCompressedOops) {
856 // Universe::initialize_heap() will reset this to NULL if unscaled
857 // or zero-based narrow oops are actually used.
858 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
859 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
860 }
861
862 return total_rs;
863 }
864
865 vm_exit_during_initialization(
866 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
867 total_reserved/K));
868
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