1505
1506
1507 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1508 // set_use_compressed_oops().
1509 void Arguments::set_use_compressed_klass_ptrs() {
1510 #ifndef ZERO
1511 #ifdef _LP64
1512 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1513 if (!UseCompressedOops) {
1514 if (UseCompressedClassPointers) {
1515 warning("UseCompressedClassPointers requires UseCompressedOops");
1516 }
1517 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1518 } else {
1519 // Turn on UseCompressedClassPointers too
1520 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1521 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1522 }
1523 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1524 if (UseCompressedClassPointers) {
1525 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1526 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1527 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1528 }
1529 }
1530 }
1531 #endif // _LP64
1532 #endif // !ZERO
1533 }
1534
1535 void Arguments::set_conservative_max_heap_alignment() {
1536 // The conservative maximum required alignment for the heap is the maximum of
1537 // the alignments imposed by several sources: any requirements from the heap
1538 // itself, the collector policy and the maximum page size we may run the VM
1539 // with.
1540 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1541 #if INCLUDE_ALL_GCS
1542 if (UseParallelGC) {
1543 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1544 } else if (UseG1GC) {
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1505
1506
1507 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1508 // set_use_compressed_oops().
1509 void Arguments::set_use_compressed_klass_ptrs() {
1510 #ifndef ZERO
1511 #ifdef _LP64
1512 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1513 if (!UseCompressedOops) {
1514 if (UseCompressedClassPointers) {
1515 warning("UseCompressedClassPointers requires UseCompressedOops");
1516 }
1517 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1518 } else {
1519 // Turn on UseCompressedClassPointers too
1520 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1521 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1522 }
1523 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1524 if (UseCompressedClassPointers) {
1525 if ((InitialBootClassLoaderMetaspaceSize + CompressedClassSpaceSize)
1526 >= MaxMetaspaceSize) {
1527 if (InitialBootClassLoaderMetaspaceSize >= MaxMetaspaceSize) {
1528 vm_exit_during_initialization(
1529 "InitialBootClassLoaderMetaspaceSize should be "
1530 "less than MaxMetaspaceSize.");
1531 } else {
1532 FLAG_SET_ERGO(size_t, CompressedClassSpaceSize,
1533 MaxMetaspaceSize - InitialBootClassLoaderMetaspaceSize);
1534 }
1535 }
1536
1537 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1538 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1539 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1540 }
1541 }
1542 }
1543 #endif // _LP64
1544 #endif // !ZERO
1545 }
1546
1547 void Arguments::set_conservative_max_heap_alignment() {
1548 // The conservative maximum required alignment for the heap is the maximum of
1549 // the alignments imposed by several sources: any requirements from the heap
1550 // itself, the collector policy and the maximum page size we may run the VM
1551 // with.
1552 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1553 #if INCLUDE_ALL_GCS
1554 if (UseParallelGC) {
1555 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1556 } else if (UseG1GC) {
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