JVM crash on large polyfills

Trước tiên, hãy tái hiện lỗi crash với trường hợp polyfill lớn trong TestH3Core.java, sau đó so sánh với trường hợp testPolyfill.c liên quan và lời gọi h3Api.polyfill. Xác định xem lỗi nằm trong Java wrapper hay thư viện core, đồng thời xác nhận bản sửa đã hoàn tất bằng các kiểm thử hồi quy cho polygon lớn.

When the following is added to TestH3Core.java, the jvm crashes out on h3Api.polyfill before completing the tests. The polyfill works at resolution 9.

    @Test
    public void testPolyfillLarge() {
        List<Long> hexagons = h3.polyfill(
                ImmutableList.<GeoCoord>of(
                        new GeoCoord(41.5, -70.4),
                        new GeoCoord(41.5, -69.8),
                        new GeoCoord(42.1, -69.8),
                        new GeoCoord(42.1, -70.4)
                ), null,
                10
        );

        assertTrue(hexagons.size() > 1000);
    }

Is this an issue with the java wrapper, or is this impossible to do with the core library?

I don't know C but adding a similar test to h3 naively copying the existing styles to testPolyfill.c at level 11 still seems to work. If I increase the resolution up past 11 it eventually segfaults there too.

GeoCoord capeCodVerts[] = {
        {0.7243116395776468, -1.2287117934040082},  {0.7243116395776468, -1.218239817892042},
        {0.7347836150896128, -1.218239817892042}, {0.7347836150896128, -1.2287117934040082}};
Geofence capeCodGeofence;
GeoPolygon capeCodGeoPolygon;

capeCodGeofence.numVerts = 4;
capeCodGeofence.verts = capeCodVerts;
capeCodGeoPolygon.geofence = capeCodGeofence;
capeCodGeoPolygon.numHoles = 0;

TEST(polyfillLarge) {
    int numHexagons = H3_EXPORT(maxPolyfillSize)(&capeCodGeoPolygon, 12);
    H3Index* hexagons = calloc(numHexagons, sizeof(H3Index));

    H3_EXPORT(polyfill)(&capeCodGeoPolygon, 11, hexagons);
    int actualNumHexagons = 0;
    for (int i = 0; i < numHexagons; i++) {
        if (hexagons[i] != 0) {
            actualNumHexagons++;
        }
    }
    
    t_assert(actualNumHexagons > 10000, "got lots of hexagons");
    free(hexagons);
}