1955 // with narrow class pointers.
1956 // We reserve the whole range spanning both spaces, then split that range up.
1957
1958 const size_t class_space_alignment = Metaspace::reserve_alignment();
1959
1960 // When running with class space, requested archive base must satisfy both cds core alignment
1961 // and class space alignment.
1962 const size_t base_address_alignment = MAX2(class_space_alignment, archive_space_alignment);
1963 assert(is_aligned(base_address, base_address_alignment),
1964 "Archive base address unaligned: " PTR_FORMAT ", needs alignment: %zu.",
1965 p2i(base_address), base_address_alignment);
1966
1967 size_t class_space_size = CompressedClassSpaceSize;
1968 assert(CompressedClassSpaceSize > 0 &&
1969 is_aligned(CompressedClassSpaceSize, class_space_alignment),
1970 "CompressedClassSpaceSize malformed: %zu", CompressedClassSpaceSize);
1971
1972 const size_t ccs_begin_offset = align_up(archive_space_size, class_space_alignment);
1973 const size_t gap_size = ccs_begin_offset - archive_space_size;
1974
1975 // Reduce class space size if it would not fit into the Klass encoding range
1976 constexpr size_t max_encoding_range_size = 4 * G;
1977 guarantee(archive_space_size < max_encoding_range_size - class_space_alignment, "Archive too large");
1978 if ((archive_space_size + gap_size + class_space_size) > max_encoding_range_size) {
1979 class_space_size = align_down(max_encoding_range_size - archive_space_size - gap_size, class_space_alignment);
1980 log_info(metaspace)("CDS initialization: reducing class space size from %zu to %zu",
1981 CompressedClassSpaceSize, class_space_size);
1982 FLAG_SET_ERGO(CompressedClassSpaceSize, class_space_size);
1983 }
1984
1985 const size_t total_range_size =
1986 archive_space_size + gap_size + class_space_size;
1987
1988 // Test that class space base address plus shift can be decoded by aarch64, when restored.
1989 const int precomputed_narrow_klass_shift = ArchiveBuilder::precomputed_narrow_klass_shift();
1990 if (!CompressedKlassPointers::check_klass_decode_mode(base_address, precomputed_narrow_klass_shift,
1991 total_range_size)) {
1992 aot_log_info(aot)("CDS initialization: Cannot use SharedBaseAddress " PTR_FORMAT " with precomputed shift %d.",
1993 p2i(base_address), precomputed_narrow_klass_shift);
1994 use_archive_base_addr = false;
1995 }
1996
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1955 // with narrow class pointers.
1956 // We reserve the whole range spanning both spaces, then split that range up.
1957
1958 const size_t class_space_alignment = Metaspace::reserve_alignment();
1959
1960 // When running with class space, requested archive base must satisfy both cds core alignment
1961 // and class space alignment.
1962 const size_t base_address_alignment = MAX2(class_space_alignment, archive_space_alignment);
1963 assert(is_aligned(base_address, base_address_alignment),
1964 "Archive base address unaligned: " PTR_FORMAT ", needs alignment: %zu.",
1965 p2i(base_address), base_address_alignment);
1966
1967 size_t class_space_size = CompressedClassSpaceSize;
1968 assert(CompressedClassSpaceSize > 0 &&
1969 is_aligned(CompressedClassSpaceSize, class_space_alignment),
1970 "CompressedClassSpaceSize malformed: %zu", CompressedClassSpaceSize);
1971
1972 const size_t ccs_begin_offset = align_up(archive_space_size, class_space_alignment);
1973 const size_t gap_size = ccs_begin_offset - archive_space_size;
1974
1975 // Reduce class space size if it would not fit into the maximum possible Klass encoding range. That
1976 // range is defined by the narrowKlass size.
1977 const size_t max_encoding_range_size = CompressedKlassPointers::max_klass_range_size();
1978 guarantee(archive_space_size < max_encoding_range_size - class_space_alignment, "Archive too large");
1979 if ((archive_space_size + gap_size + class_space_size) > max_encoding_range_size) {
1980 class_space_size = align_down(max_encoding_range_size - archive_space_size - gap_size, class_space_alignment);
1981 log_info(metaspace)("CDS initialization: reducing class space size from %zu to %zu",
1982 CompressedClassSpaceSize, class_space_size);
1983 FLAG_SET_ERGO(CompressedClassSpaceSize, class_space_size);
1984 }
1985
1986 const size_t total_range_size =
1987 archive_space_size + gap_size + class_space_size;
1988
1989 // Test that class space base address plus shift can be decoded by aarch64, when restored.
1990 const int precomputed_narrow_klass_shift = ArchiveBuilder::precomputed_narrow_klass_shift();
1991 if (!CompressedKlassPointers::check_klass_decode_mode(base_address, precomputed_narrow_klass_shift,
1992 total_range_size)) {
1993 aot_log_info(aot)("CDS initialization: Cannot use SharedBaseAddress " PTR_FORMAT " with precomputed shift %d.",
1994 p2i(base_address), precomputed_narrow_klass_shift);
1995 use_archive_base_addr = false;
1996 }
1997
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