737 #ifdef _LP64
738 if (UseCompressedOops) {
739 // Subtract a page because something can get allocated at heap base.
740 // This also makes implicit null checking work, because the
741 // memory+1 page below heap_base needs to cause a signal.
742 // See needs_explicit_null_check.
743 // Only set the heap base for compressed oops because it indicates
744 // compressed oops for pstack code.
745 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
746 // Didn't reserve heap below 4Gb. Must shift.
747 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
748 }
749 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
750 // Did reserve heap below 32Gb. Can use base == 0;
751 Universe::set_narrow_oop_base(0);
752 }
753
754 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
755
756 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
757 Universe::print_compressed_oops_mode();
758 }
759
760 // Tell tests in which mode we run.
761 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
762 narrow_oop_mode_to_string(narrow_oop_mode()),
763 false));
764 }
765 // Universe::narrow_oop_base() is one page below the heap.
766 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
767 os::vm_page_size()) ||
768 Universe::narrow_oop_base() == NULL, "invalid value");
769 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
770 Universe::narrow_oop_shift() == 0, "invalid value");
771 #endif
772
773 // We will never reach the CATCH below since Exceptions::_throw will cause
774 // the VM to exit if an exception is thrown during initialization
775
776 if (UseTLAB) {
777 assert(Universe::heap()->supports_tlab_allocation(),
778 "Should support thread-local allocation buffers");
779 ThreadLocalAllocBuffer::startup_initialization();
780 }
781 return JNI_OK;
782 }
783
784 void Universe::print_compressed_oops_mode() {
785 tty->cr();
786 tty->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
787 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
788
789 tty->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
790
791 if (Universe::narrow_oop_base() != 0) {
792 tty->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
793 }
794
795 if (Universe::narrow_oop_shift() != 0) {
796 tty->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
797 }
798
799 if (!Universe::narrow_oop_use_implicit_null_checks()) {
800 tty->print(", no protected page in front of the heap");
801 }
802
803 tty->cr();
804 tty->cr();
805 }
806
807 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
808
809 assert(alignment <= Arguments::conservative_max_heap_alignment(),
810 err_msg("actual alignment "SIZE_FORMAT" must be within maximum heap alignment "SIZE_FORMAT,
811 alignment, Arguments::conservative_max_heap_alignment()));
812
813 size_t total_reserved = align_size_up(heap_size, alignment);
814 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
815 "heap size is too big for compressed oops");
816
817 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size());
818 assert(!UseLargePages
819 || UseParallelGC
820 || use_large_pages, "Wrong alignment to use large pages");
821
822 // Now create the space.
823 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages);
824
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737 #ifdef _LP64
738 if (UseCompressedOops) {
739 // Subtract a page because something can get allocated at heap base.
740 // This also makes implicit null checking work, because the
741 // memory+1 page below heap_base needs to cause a signal.
742 // See needs_explicit_null_check.
743 // Only set the heap base for compressed oops because it indicates
744 // compressed oops for pstack code.
745 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
746 // Didn't reserve heap below 4Gb. Must shift.
747 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
748 }
749 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
750 // Did reserve heap below 32Gb. Can use base == 0;
751 Universe::set_narrow_oop_base(0);
752 }
753
754 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
755
756 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
757 Universe::print_compressed_oops_mode(tty);
758 }
759
760 // Tell tests in which mode we run.
761 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
762 narrow_oop_mode_to_string(narrow_oop_mode()),
763 false));
764 }
765 // Universe::narrow_oop_base() is one page below the heap.
766 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
767 os::vm_page_size()) ||
768 Universe::narrow_oop_base() == NULL, "invalid value");
769 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
770 Universe::narrow_oop_shift() == 0, "invalid value");
771 #endif
772
773 // We will never reach the CATCH below since Exceptions::_throw will cause
774 // the VM to exit if an exception is thrown during initialization
775
776 if (UseTLAB) {
777 assert(Universe::heap()->supports_tlab_allocation(),
778 "Should support thread-local allocation buffers");
779 ThreadLocalAllocBuffer::startup_initialization();
780 }
781 return JNI_OK;
782 }
783
784 void Universe::print_compressed_oops_mode(outputStream* st) {
785 st->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
786 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
787
788 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
789
790 if (Universe::narrow_oop_base() != 0) {
791 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
792 }
793
794 if (Universe::narrow_oop_shift() != 0) {
795 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
796 }
797
798 if (!Universe::narrow_oop_use_implicit_null_checks()) {
799 st->print(", no protected page in front of the heap");
800 }
801 st->cr();
802 }
803
804 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
805
806 assert(alignment <= Arguments::conservative_max_heap_alignment(),
807 err_msg("actual alignment "SIZE_FORMAT" must be within maximum heap alignment "SIZE_FORMAT,
808 alignment, Arguments::conservative_max_heap_alignment()));
809
810 size_t total_reserved = align_size_up(heap_size, alignment);
811 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
812 "heap size is too big for compressed oops");
813
814 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size());
815 assert(!UseLargePages
816 || UseParallelGC
817 || use_large_pages, "Wrong alignment to use large pages");
818
819 // Now create the space.
820 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages);
821
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