1936 // with narrow class pointers.
1937 // We reserve the whole range spanning both spaces, then split that range up.
1938
1939 const size_t class_space_alignment = Metaspace::reserve_alignment();
1940
1941 // When running with class space, requested archive base must satisfy both cds core alignment
1942 // and class space alignment.
1943 const size_t base_address_alignment = MAX2(class_space_alignment, archive_space_alignment);
1944 assert(is_aligned(base_address, base_address_alignment),
1945 "Archive base address unaligned: " PTR_FORMAT ", needs alignment: %zu.",
1946 p2i(base_address), base_address_alignment);
1947
1948 size_t class_space_size = CompressedClassSpaceSize;
1949 assert(CompressedClassSpaceSize > 0 &&
1950 is_aligned(CompressedClassSpaceSize, class_space_alignment),
1951 "CompressedClassSpaceSize malformed: %zu", CompressedClassSpaceSize);
1952
1953 const size_t ccs_begin_offset = align_up(archive_space_size, class_space_alignment);
1954 const size_t gap_size = ccs_begin_offset - archive_space_size;
1955
1956 // Reduce class space size if it would not fit into the Klass encoding range
1957 constexpr size_t max_encoding_range_size = 4 * G;
1958 guarantee(archive_space_size < max_encoding_range_size - class_space_alignment, "Archive too large");
1959 if ((archive_space_size + gap_size + class_space_size) > max_encoding_range_size) {
1960 class_space_size = align_down(max_encoding_range_size - archive_space_size - gap_size, class_space_alignment);
1961 log_info(metaspace)("CDS initialization: reducing class space size from %zu to %zu",
1962 CompressedClassSpaceSize, class_space_size);
1963 FLAG_SET_ERGO(CompressedClassSpaceSize, class_space_size);
1964 }
1965
1966 const size_t total_range_size =
1967 archive_space_size + gap_size + class_space_size;
1968
1969 // Test that class space base address plus shift can be decoded by aarch64, when restored.
1970 const int precomputed_narrow_klass_shift = ArchiveBuilder::precomputed_narrow_klass_shift();
1971 if (!CompressedKlassPointers::check_klass_decode_mode(base_address, precomputed_narrow_klass_shift,
1972 total_range_size)) {
1973 aot_log_info(aot)("CDS initialization: Cannot use SharedBaseAddress " PTR_FORMAT " with precomputed shift %d.",
1974 p2i(base_address), precomputed_narrow_klass_shift);
1975 use_archive_base_addr = false;
1976 }
1977
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1936 // with narrow class pointers.
1937 // We reserve the whole range spanning both spaces, then split that range up.
1938
1939 const size_t class_space_alignment = Metaspace::reserve_alignment();
1940
1941 // When running with class space, requested archive base must satisfy both cds core alignment
1942 // and class space alignment.
1943 const size_t base_address_alignment = MAX2(class_space_alignment, archive_space_alignment);
1944 assert(is_aligned(base_address, base_address_alignment),
1945 "Archive base address unaligned: " PTR_FORMAT ", needs alignment: %zu.",
1946 p2i(base_address), base_address_alignment);
1947
1948 size_t class_space_size = CompressedClassSpaceSize;
1949 assert(CompressedClassSpaceSize > 0 &&
1950 is_aligned(CompressedClassSpaceSize, class_space_alignment),
1951 "CompressedClassSpaceSize malformed: %zu", CompressedClassSpaceSize);
1952
1953 const size_t ccs_begin_offset = align_up(archive_space_size, class_space_alignment);
1954 const size_t gap_size = ccs_begin_offset - archive_space_size;
1955
1956 // Reduce class space size if it would not fit into the maximum possible Klass encoding range. That
1957 // range is defined by the narrowKlass size.
1958 const size_t max_encoding_range_size = CompressedKlassPointers::max_klass_range_size();
1959 guarantee(archive_space_size < max_encoding_range_size - class_space_alignment, "Archive too large");
1960 if ((archive_space_size + gap_size + class_space_size) > max_encoding_range_size) {
1961 class_space_size = align_down(max_encoding_range_size - archive_space_size - gap_size, class_space_alignment);
1962 log_info(metaspace)("CDS initialization: reducing class space size from %zu to %zu",
1963 CompressedClassSpaceSize, class_space_size);
1964 FLAG_SET_ERGO(CompressedClassSpaceSize, class_space_size);
1965 }
1966
1967 const size_t total_range_size =
1968 archive_space_size + gap_size + class_space_size;
1969
1970 // Test that class space base address plus shift can be decoded by aarch64, when restored.
1971 const int precomputed_narrow_klass_shift = ArchiveBuilder::precomputed_narrow_klass_shift();
1972 if (!CompressedKlassPointers::check_klass_decode_mode(base_address, precomputed_narrow_klass_shift,
1973 total_range_size)) {
1974 aot_log_info(aot)("CDS initialization: Cannot use SharedBaseAddress " PTR_FORMAT " with precomputed shift %d.",
1975 p2i(base_address), precomputed_narrow_klass_shift);
1976 use_archive_base_addr = false;
1977 }
1978
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