1930 // with narrow class pointers.
1931 // We reserve the whole range spanning both spaces, then split that range up.
1932
1933 const size_t class_space_alignment = Metaspace::reserve_alignment();
1934
1935 // When running with class space, requested archive base must satisfy both cds core alignment
1936 // and class space alignment.
1937 const size_t base_address_alignment = MAX2(class_space_alignment, archive_space_alignment);
1938 assert(is_aligned(base_address, base_address_alignment),
1939 "Archive base address unaligned: " PTR_FORMAT ", needs alignment: %zu.",
1940 p2i(base_address), base_address_alignment);
1941
1942 size_t class_space_size = CompressedClassSpaceSize;
1943 assert(CompressedClassSpaceSize > 0 &&
1944 is_aligned(CompressedClassSpaceSize, class_space_alignment),
1945 "CompressedClassSpaceSize malformed: %zu", CompressedClassSpaceSize);
1946
1947 const size_t ccs_begin_offset = align_up(archive_space_size, class_space_alignment);
1948 const size_t gap_size = ccs_begin_offset - archive_space_size;
1949
1950 // Reduce class space size if it would not fit into the Klass encoding range
1951 constexpr size_t max_encoding_range_size = 4 * G;
1952 guarantee(archive_space_size < max_encoding_range_size - class_space_alignment, "Archive too large");
1953 if ((archive_space_size + gap_size + class_space_size) > max_encoding_range_size) {
1954 class_space_size = align_down(max_encoding_range_size - archive_space_size - gap_size, class_space_alignment);
1955 log_info(metaspace)("CDS initialization: reducing class space size from %zu to %zu",
1956 CompressedClassSpaceSize, class_space_size);
1957 FLAG_SET_ERGO(CompressedClassSpaceSize, class_space_size);
1958 }
1959
1960 const size_t total_range_size =
1961 archive_space_size + gap_size + class_space_size;
1962
1963 // Test that class space base address plus shift can be decoded by aarch64, when restored.
1964 const int precomputed_narrow_klass_shift = ArchiveBuilder::precomputed_narrow_klass_shift();
1965 if (!CompressedKlassPointers::check_klass_decode_mode(base_address, precomputed_narrow_klass_shift,
1966 total_range_size)) {
1967 aot_log_info(aot)("CDS initialization: Cannot use SharedBaseAddress " PTR_FORMAT " with precomputed shift %d.",
1968 p2i(base_address), precomputed_narrow_klass_shift);
1969 use_archive_base_addr = false;
1970 }
1971
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1930 // with narrow class pointers.
1931 // We reserve the whole range spanning both spaces, then split that range up.
1932
1933 const size_t class_space_alignment = Metaspace::reserve_alignment();
1934
1935 // When running with class space, requested archive base must satisfy both cds core alignment
1936 // and class space alignment.
1937 const size_t base_address_alignment = MAX2(class_space_alignment, archive_space_alignment);
1938 assert(is_aligned(base_address, base_address_alignment),
1939 "Archive base address unaligned: " PTR_FORMAT ", needs alignment: %zu.",
1940 p2i(base_address), base_address_alignment);
1941
1942 size_t class_space_size = CompressedClassSpaceSize;
1943 assert(CompressedClassSpaceSize > 0 &&
1944 is_aligned(CompressedClassSpaceSize, class_space_alignment),
1945 "CompressedClassSpaceSize malformed: %zu", CompressedClassSpaceSize);
1946
1947 const size_t ccs_begin_offset = align_up(archive_space_size, class_space_alignment);
1948 const size_t gap_size = ccs_begin_offset - archive_space_size;
1949
1950 // Reduce class space size if it would not fit into the maximum possible Klass encoding range. That
1951 // range is defined by the narrowKlass size.
1952 const size_t max_encoding_range_size = CompressedKlassPointers::max_klass_range_size();
1953 guarantee(archive_space_size < max_encoding_range_size - class_space_alignment, "Archive too large");
1954 if ((archive_space_size + gap_size + class_space_size) > max_encoding_range_size) {
1955 class_space_size = align_down(max_encoding_range_size - archive_space_size - gap_size, class_space_alignment);
1956 log_info(metaspace)("CDS initialization: reducing class space size from %zu to %zu",
1957 CompressedClassSpaceSize, class_space_size);
1958 FLAG_SET_ERGO(CompressedClassSpaceSize, class_space_size);
1959 }
1960
1961 const size_t total_range_size =
1962 archive_space_size + gap_size + class_space_size;
1963
1964 // Test that class space base address plus shift can be decoded by aarch64, when restored.
1965 const int precomputed_narrow_klass_shift = ArchiveBuilder::precomputed_narrow_klass_shift();
1966 if (!CompressedKlassPointers::check_klass_decode_mode(base_address, precomputed_narrow_klass_shift,
1967 total_range_size)) {
1968 aot_log_info(aot)("CDS initialization: Cannot use SharedBaseAddress " PTR_FORMAT " with precomputed shift %d.",
1969 p2i(base_address), precomputed_narrow_klass_shift);
1970 use_archive_base_addr = false;
1971 }
1972
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