Function array_resize

src/simulate/runtime_array.cpp:90–110

    }

    void array_resize ( Context & context, Array & arr, uint64_t newSize, uint32_t stride, bool zero, LineInfo * at ) {
        if ( arr.isLocked() ) context.throw_error_at(at, "can't resize locked array");
        // The daslang surface contract is `long_length(arr) : int64`, so a size that doesn't
        // fit in int64_t would wrap negative on the way out. Enforce the cap up front so the
        // int64 API stays well-defined.
        if ( newSize > uint64_t(INT64_MAX) ) {
            context.throw_error_at(at, "array_resize: newSize exceeds INT64_MAX [newSize=%llu]", (unsigned long long)newSize);
        }
        if ( newSize > arr.capacity ) {
            uint64_t newCapacity = uint64_t(1) << (64 - das_clz64(das::max(newSize, uint64_t(2)) - 1));
            newCapacity = das::max(newCapacity, uint64_t(16));
            // The pow2 round-up overflows past INT64_MAX when newSize > 2^62; clamp so the
            // resulting capacity stays representable in the int64 long_capacity() surface.
            if ( newCapacity > uint64_t(INT64_MAX) ) newCapacity = uint64_t(INT64_MAX);
            array_reserve(context, arr, newCapacity, stride, at);
        }
        if ( zero && newSize>arr.size ) {
            memset ( arr.data + arr.size*stride, 0, size_t(newSize-arr.size)*size_t(stride) );
        }
        arr.size = newSize;
    }

    // GoodArrayIterator