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1 | static Map<Class, Int> unsafe_sizeOf_cache = weakHashMap(); |
2 | |
3 | static long unsafe_sizeOf(O o) {
|
4 | if (isArray(o)) |
5 | if (o cast O[]) |
6 | ret inMemorySizeOfObjectArray(o.length); |
7 | else |
8 | ret inMemorySizeOfPrimitiveArray(o); |
9 | |
10 | Class c = _getClass(o); |
11 | Int l = unsafe_sizeOf_cache.get(c); |
12 | if (l == null) |
13 | unsafe_sizeOf_cache.put(c, l = unsafe_sizeOf_uncached(c)); |
14 | ret l; |
15 | } |
16 | |
17 | static int unsafe_sizeOf_uncached(Class src) {
|
18 | int WORD = javaDataModelWordSize(); |
19 | int MIN_SIZE = 16; |
20 | |
21 | new L<Field> instanceFields; |
22 | while (src != null && src != O.class && empty(instanceFields)) {
|
23 | for (Field f : src.getDeclaredFields()) |
24 | if ((f.getModifiers() & Modifier.STATIC) == 0) |
25 | instanceFields.add(f); |
26 | src = src.getSuperclass(); |
27 | } |
28 | |
29 | long maxOffset = MIN_SIZE-1; |
30 | |
31 | for (Field f : instanceFields) {
|
32 | long offset = unsafe_objectFieldOffset(f); |
33 | if (offset > maxOffset) maxOffset = offset; |
34 | } |
35 | ret (((int) maxOffset/WORD) + 1)*WORD; |
36 | } |
from https://stackoverflow.com/questions/9368764/calculate-size-of-object-in-java (modified)
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| Snippet ID: | #1011517 |
| Snippet name: | unsafe_sizeOf |
| Eternal ID of this version: | #1011517/25 |
| Text MD5: | 95a47a60d60768231a5810dca1dfb384 |
| Transpilation MD5: | 27fef58c29c18859b4d29b4626fb271f |
| Author: | stefan |
| Category: | javax / unsafe |
| Type: | JavaX fragment (include) |
| Public (visible to everyone): | Yes |
| Archived (hidden from active list): | No |
| Created/modified: | 2021-09-29 21:14:09 |
| Source code size: | 1015 bytes / 36 lines |
| Pitched / IR pitched: | No / No |
| Views / Downloads: | 890 / 1070 |
| Version history: | 24 change(s) |
| Referenced in: | [show references] |