DISCLAIMER: These notes are from the defunct k8 project which precedes SquirrelJME. The notes for SquirrelJME start on 2016/02/26! The k8 project was effectively a Java SE 8 operating system and as such all of the notes are in the context of that scope. That project is no longer my goal as SquirrelJME is the spiritual successor to it.
10:34
Awake now.
13:10
I believe I am going to remove the boolean return type for the generation arguments.
13:49
Also splitting the translator away from POITDynaRec into a new class makes it much better also.
14:01
I dislike it when the last commit I want to make does not get committed so it is delayed until I commit next. However, the refactoring of the base class is much nicer now and there were massive import cleanups too. POITDynaRec is also much simpler and easier to read with all of the translation stuff in another class.
18:01
Found a bug in StandardBindings, was using int registers instead of float ones. And I only found that out after a refactor because the new code is much more strict.
21:05
Need stack map table handling for synchronized (this).
21:59
RISC-V looks interesting. I do wonder though how I will handle synchronization since I have never done that before. I can just setup a bunch of code that is rather simple and then just look at the javap result of it.
Can see that the inner static does monitorenter on class Bar.
public static void staticInner();
descriptor: ()V
flags: ACC_PUBLIC, ACC_STATIC
Code:
stack=3, locals=2, args_size=0
0: ldc #2 // class Bar
2: dup
3: astore_0
4: monitorenter
5: getstatic #3 // Field java/lang/System.out:Ljava/io/PrintS
8: ldc #4 // String Static inner.
10: invokevirtual #5 // Method java/io/PrintStream.println:(Ljava
13: new #6 // class java/lang/UnknownError
16: dup
17: ldc #7 // String TODO
19: invokespecial #8 // Method java/lang/UnknownError."<init>":(L
22: athrow
23: astore_1
24: aload_0
25: monitorexit
26: aload_1
27: athrow
Exception table:
from to target type
5 26 23 any
LineNumberTable:
line 5: 0
line 7: 5
line 8: 13
line 9: 23
StackMapTable: number_of_entries = 1
frame_type = 255 /* full_frame */
offset_delta = 23
locals = [ class java/lang/Object ]
stack = [ class java/lang/Throwable ]
While the outer code has no monitor code at all.
public static synchronized void staticOuter();
descriptor: ()V
flags: ACC_PUBLIC, ACC_STATIC, ACC_SYNCHRONIZED
Code:
stack=3, locals=0, args_size=0
0: getstatic #3 // Field java/lang/System.out:Ljava/io/PrintS
3: ldc #9 // String Static outer.
5: invokevirtual #5 // Method java/io/PrintStream.println:(Ljava/
8: new #6 // class java/lang/UnknownError
11: dup
12: ldc #7 // String TODO
14: invokespecial #8 // Method java/lang/UnknownError."<init>":(L
17: athrow
LineNumberTable:
line 14: 0
line 15: 8
The outer lacks a stack map table also.
public void instanceInner();
descriptor: ()V
flags: ACC_PUBLIC
Code:
stack=3, locals=3, args_size=1
0: aload_0
1: dup
2: astore_1
3: monitorenter
4: getstatic #3 // Field java/lang/System.out:Ljava/io/PrintS
7: ldc #10 // String Instance inner.
9: invokevirtual #5 // Method java/io/PrintStream.println:(Ljava/
12: new #6 // class java/lang/UnknownError
15: dup
16: ldc #7 // String TODO
18: invokespecial #8 // Method java/lang/UnknownError."<init>":(L
21: athrow
22: astore_2
23: aload_1
24: monitorexit
25: aload_2
26: athrow
Exception table:
from to target type
4 25 22 any
LineNumberTable:
line 20: 0
line 22: 4
line 23: 12
line 24: 22
StackMapTable: number_of_entries = 1
frame_type = 255 /* full_frame */
offset_delta = 22
locals = [ class Bar, class java/lang/Object ]
stack = [ class java/lang/Throwable ]
So the same is seen here also.
public synchronized void instanceOuter();
descriptor: ()V
flags: ACC_PUBLIC, ACC_SYNCHRONIZED
Code:
stack=3, locals=1, args_size=1
0: getstatic #3 // Field java/lang/System.out:Ljava/io/PrintS
3: ldc #11 // String Instance outer.
5: invokevirtual #5 // Method java/io/PrintStream.println:(Ljava/
8: new #6 // class java/lang/UnknownError
11: dup
12: ldc #7 // String TODO
14: invokespecial #8 // Method java/lang/UnknownError."<init>":(L
17: athrow
LineNumberTable:
line 29: 0
line 30: 8
I can either wrap it at run-time or I can just generate it as it. If I do have it then I will need a global exception handler so monitorexit is called at the very end of a method.
22:14
Would have been better if the language standard just had synchronized compiled
the same as synchronized (this).