1720
1721
1722 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1723 // set_use_compressed_oops().
1724 void Arguments::set_use_compressed_klass_ptrs() {
1725 #ifndef ZERO
1726 #ifdef _LP64
1727 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1728 if (!UseCompressedOops) {
1729 if (UseCompressedClassPointers) {
1730 warning("UseCompressedClassPointers requires UseCompressedOops");
1731 }
1732 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1733 } else {
1734 // Turn on UseCompressedClassPointers too
1735 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1736 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1737 }
1738 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1739 if (UseCompressedClassPointers) {
1740 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1741 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1742 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1743 }
1744 }
1745 }
1746 #endif // _LP64
1747 #endif // !ZERO
1748 }
1749
1750 void Arguments::set_conservative_max_heap_alignment() {
1751 // The conservative maximum required alignment for the heap is the maximum of
1752 // the alignments imposed by several sources: any requirements from the heap
1753 // itself, the collector policy and the maximum page size we may run the VM
1754 // with.
1755 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1756 #if INCLUDE_ALL_GCS
1757 if (UseParallelGC) {
1758 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1759 } else if (UseG1GC) {
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1720
1721
1722 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1723 // set_use_compressed_oops().
1724 void Arguments::set_use_compressed_klass_ptrs() {
1725 #ifndef ZERO
1726 #ifdef _LP64
1727 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1728 if (!UseCompressedOops) {
1729 if (UseCompressedClassPointers) {
1730 warning("UseCompressedClassPointers requires UseCompressedOops");
1731 }
1732 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1733 } else {
1734 // Turn on UseCompressedClassPointers too
1735 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1736 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1737 }
1738 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1739 if (UseCompressedClassPointers) {
1740 size_t min_metaspace_sz = Metaspace::calculate_min_metaspace_size();
1741 if ((min_metaspace_sz + CompressedClassSpaceSize) > MaxMetaspaceSize) {
1742 if (min_metaspace_sz >= MaxMetaspaceSize) {
1743 vm_exit_during_initialization("MaxMetaspaceSize is too small.");
1744 } else {
1745 FLAG_SET_ERGO(size_t, CompressedClassSpaceSize,
1746 MaxMetaspaceSize - min_metaspace_sz);
1747 }
1748 }
1749
1750 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1751 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1752 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1753 }
1754 }
1755 }
1756 #endif // _LP64
1757 #endif // !ZERO
1758 }
1759
1760 void Arguments::set_conservative_max_heap_alignment() {
1761 // The conservative maximum required alignment for the heap is the maximum of
1762 // the alignments imposed by several sources: any requirements from the heap
1763 // itself, the collector policy and the maximum page size we may run the VM
1764 // with.
1765 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1766 #if INCLUDE_ALL_GCS
1767 if (UseParallelGC) {
1768 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1769 } else if (UseG1GC) {
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