- Notifications
You must be signed in to change notification settings - Fork1
ChaosLeung/AOL
Folders and files
| Name | Name | Last commit message | Last commit date | |
|---|---|---|---|---|
Repository files navigation
AOL is a tool for analyze object layout in ART.
./aol.sh -i cli.apk
# Instance layout (instance fields)./aol.sh -o instance -c java.util.HashMap# Class layout (static fields)./aol.sh -o class -c java.util.HashMap
Usage: -i install aol cli to device -s device serial -o option of aol, one of [class, instance] -c class name -h helpShow the layout:
val layout=ObjectLayout.parse(HashMap::class.java)layout.dumpToLog(classInfo=false)// Show instance layout (instance fields)layout.dumpToLog(classInfo=true)// Show class layout (static fields)
The output is similar to the "internals" ofJOL
java.util.HashMap object internals: OFFSET SIZE DECLARING_CLASS TYPE FIELD 0 4 Object Class shadow$_klass_ 4 4 Object int shadow$_monitor_ 8 4 AbstractMap Set keySet 12 4 AbstractMap Collection values 16 4 HashMap Set entrySet 20 4 HashMap HashMap$Node[] table 24 4 HashMap int modCount 28 4 HashMap int size 32 4 HashMap int threshold 36 4 HashMap float loadFactorInstance size: 40 bytesjava.util.HashMap class internals: OFFSET SIZE DECLARING_CLASS TYPE FIELD 0 4 Object Class shadow$_klass_ 4 4 Object int shadow$_monitor_ 8 4 Class ClassLoader classLoader 12 4 Class Class componentType 16 4 Class Object dexCache 20 4 Class ClassExt extData 24 4 Class Object[] ifTable 28 4 Class String name 32 4 Class Class superClass 36 4 Class Object vtable 40 8 Class long iFields 48 8 Class long methods 56 8 Class long sFields 64 4 Class int accessFlags 68 4 Class int classFlags 72 4 Class int classSize 76 4 Class int clinitThreadId 80 4 Class int dexClassDefIndex 84 4 Class int dexTypeIndex 88 4 Class int numReferenceInstanceFields 92 4 Class int numReferenceStaticFields 96 4 Class int objectSize 100 4 Class int objectSizeAllocFastPath 104 4 Class int primitiveType 108 4 Class int referenceInstanceOffsets 112 4 Class int status 116 2 Class short copiedMethodsOffset 118 2 Class short virtualMethodsOffset 120 424 (alignment/padding gap) 544 8 HashMap long serialVersionUID 552 4 HashMap int DEFAULT_INITIAL_CAPACITY 556 4 HashMap int MAXIMUM_CAPACITY 560 4 HashMap int MIN_TREEIFY_CAPACITY 564 4 HashMap int TREEIFY_THRESHOLD 568 4 HashMap int UNTREEIFY_THRESHOLD 572 4 HashMap float DEFAULT_LOAD_FACTORClass size: 576 bytesSpace losses: 424 bytes internal + 0 bytes external = 424 bytes total