Align instance fields to optimize object size
| Project: | JNode Core |
| Component: | Code |
| Category: | feature request |
| Priority: | normal |
| Assigned: | admin |
| Status: | closed |
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Description
All instance fields are now aligned on 4 byte boundaries.
The instance fields should be aligned on their smallest boundary,
this means that:
boolean,byte aligned on 1 byte
char,short aligned on 2 byte
int,float aligned on 4 byte
long,double aligned on 8 byte
reference aligned on reference size
This change will impact:
- The class decoder,
- The native code compilers,
- The reflection implementation,
- The ObjectEmitter in the build
- Maybe some parts of assembler code
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and in 64 bit architecture
Hi,
but in a 64 bit architecture (like AMD64) would use this:
int, float aligned on 64 byte (1x64-bit word)
long, double aligned on 128 byte (2x64-bit word)
Or not ?
And in this case will be JNode 32-bit generated classes compatibles with 64-bit classes ?
Bye,
Sandro
No need
On AMD64 it can be exactly the same as on x86.
Ewout
#1
Change has been implemented.
Limited results, since most classes use int's instead of smaller types like bytes & shorts.
#2