restore some needed code from AddInterfaces #23
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when AddInterfaces was removed we regressed on being able to compile class C; trait T extends C why? T will become an interface, and by JVM rules, an interface cannot extend a class, so we need to replace `extends C` with `extends Object`. this commit restores the part of AddInterfaces that did that.
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adriaanm
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Aug 7, 2015
restore some needed code from AddInterfaces
adriaanm
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Aug 8, 2015
And do the same for the specialized variants.
Tested by a Java source file that uses lambda syntax to create
instances of generic and specialized `Function{0,1}`.
Here's how the interfaces look now:
```
% javap -c -classpath /tmp/function 'scala.Function1'
Compiled from "Function1.scala"
public interface scala.Function1<T1, R> {
public abstract R apply(T1);
public <A> scala.Function1<A, R> compose(scala.Function1<A, T1>);
Code:
0: aload_0
1: aload_1
2: invokestatic #18 // Method scala/Function1$class.compose:(Lscala/Function1;Lscala/Function1;)Lscala/Function1;
5: areturn
public <A> scala.Function1<T1, A> andThen(scala.Function1<R, A>);
Code:
0: aload_0
1: aload_1
2: invokestatic #24 // Method scala/Function1$class.andThen:(Lscala/Function1;Lscala/Function1;)Lscala/Function1;
5: areturn
public abstract java.lang.String toString();
public int apply$mcII$sp(int);
Code:
0: aload_0
1: iload_1
2: invokestatic scala#110 // Method scala/Function1$class.apply$mcII$sp:(Lscala/Function1;I)I
5: ireturn
public long apply$mcJI$sp(int);
Code:
0: aload_0
1: iload_1
2: invokestatic scala#115 // Method scala/Function1$class.apply$mcJI$sp:(Lscala/Function1;I)J
5: lreturn
...
}
% javap -c -classpath /tmp/function 'scala.Function1$mcII$sp'
Compiled from "Function1.scala"
public interface scala.Function1$mcII$sp extends scala.Function1<java.lang.Object, java.lang.Object> {
public java.lang.Object apply(java.lang.Object);
Code:
0: aload_0
1: aload_1
2: invokestatic #16 // Method scala/runtime/BoxesRunTime.unboxToInt:(Ljava/lang/Object;)I
5: invokeinterface #19, 2 // InterfaceMethod apply:(I)I
10: invokestatic #23 // Method scala/runtime/BoxesRunTime.boxToInteger:(I)Ljava/lang/Integer;
13: areturn
public abstract int apply$mcII$sp(int);
public int apply(int);
Code:
0: aload_0
1: iload_1
2: invokeinterface scala#30, 2 // InterfaceMethod apply$mcII$sp:(I)I
7: ireturn
}
```
adriaanm
pushed a commit
that referenced
this pull request
Sep 2, 2015
And do the same for the specialized variants.
Tested by a Java source file that uses lambda syntax to create
instances of generic and specialized `Function{0,1}`.
Here's how the interfaces look now:
```
% javap -c -classpath /tmp/function 'scala.Function1'
Compiled from "Function1.scala"
public interface scala.Function1<T1, R> {
public abstract R apply(T1);
public <A> scala.Function1<A, R> compose(scala.Function1<A, T1>);
Code:
0: aload_0
1: aload_1
2: invokestatic #18 // Method scala/Function1$class.compose:(Lscala/Function1;Lscala/Function1;)Lscala/Function1;
5: areturn
public <A> scala.Function1<T1, A> andThen(scala.Function1<R, A>);
Code:
0: aload_0
1: aload_1
2: invokestatic #24 // Method scala/Function1$class.andThen:(Lscala/Function1;Lscala/Function1;)Lscala/Function1;
5: areturn
public abstract java.lang.String toString();
public int apply$mcII$sp(int);
Code:
0: aload_0
1: iload_1
2: invokestatic scala#110 // Method scala/Function1$class.apply$mcII$sp:(Lscala/Function1;I)I
5: ireturn
public long apply$mcJI$sp(int);
Code:
0: aload_0
1: iload_1
2: invokestatic scala#115 // Method scala/Function1$class.apply$mcJI$sp:(Lscala/Function1;I)J
5: lreturn
...
}
% javap -c -classpath /tmp/function 'scala.Function1$mcII$sp'
Compiled from "Function1.scala"
public interface scala.Function1$mcII$sp extends scala.Function1<java.lang.Object, java.lang.Object> {
public java.lang.Object apply(java.lang.Object);
Code:
0: aload_0
1: aload_1
2: invokestatic #16 // Method scala/runtime/BoxesRunTime.unboxToInt:(Ljava/lang/Object;)I
5: invokeinterface #19, 2 // InterfaceMethod apply:(I)I
10: invokestatic #23 // Method scala/runtime/BoxesRunTime.boxToInteger:(I)Ljava/lang/Integer;
13: areturn
public abstract int apply$mcII$sp(int);
public int apply(int);
Code:
0: aload_0
1: iload_1
2: invokeinterface scala#30, 2 // InterfaceMethod apply$mcII$sp:(I)I
7: ireturn
}
```
adriaanm
pushed a commit
that referenced
this pull request
Jun 7, 2016
This corrects an error in the change to the trait encoding in scala#5003: getters in traits should have empty bodies and be emitted as abstract. ``` % ~/scala/2.12.0-M4/bin/scalac sandbox/test.scala && javap -c T Compiled from "test.scala" public interface T { public abstract void T$_setter_$x_$eq(int); public int x(); Code: 0: aload_0 1: invokeinterface #15, 1 // InterfaceMethod x:()I 6: ireturn public int y(); Code: 0: aload_0 1: invokeinterface #20, 1 // InterfaceMethod y:()I 6: ireturn public void y_$eq(int); Code: 0: aload_0 1: iload_1 2: invokeinterface #24, 2 // InterfaceMethod y_$eq:(I)V 7: return public void $init$(); Code: 0: aload_0 1: bipush 42 3: invokeinterface scala#29, 2 // InterfaceMethod T$_setter_$x_$eq:(I)V 8: aload_0 9: bipush 24 11: invokeinterface #24, 2 // InterfaceMethod y_$eq:(I)V 16: return } % qscalac sandbox/test.scala && javap -c T Compiled from "test.scala" public interface T { public abstract void T$_setter_$x_$eq(int); public abstract int x(); public abstract int y(); public abstract void y_$eq(int); public static void $init$(T); Code: 0: aload_0 1: bipush 42 3: invokeinterface #21, 2 // InterfaceMethod T$_setter_$x_$eq:(I)V 8: aload_0 9: bipush 24 11: invokeinterface #23, 2 // InterfaceMethod y_$eq:(I)V 16: return public void $init$(); Code: 0: aload_0 1: invokestatic scala#27 // Method $init$:(LT;)V 4: return } ```
adriaanm
pushed a commit
that referenced
this pull request
Jun 28, 2016
This corrects an error in the change to the trait encoding in scala#5003: getters in traits should have empty bodies and be emitted as abstract. ``` % ~/scala/2.12.0-M4/bin/scalac sandbox/test.scala && javap -c T Compiled from "test.scala" public interface T { public abstract void T$_setter_$x_$eq(int); public int x(); Code: 0: aload_0 1: invokeinterface #15, 1 // InterfaceMethod x:()I 6: ireturn public int y(); Code: 0: aload_0 1: invokeinterface #20, 1 // InterfaceMethod y:()I 6: ireturn public void y_$eq(int); Code: 0: aload_0 1: iload_1 2: invokeinterface #24, 2 // InterfaceMethod y_$eq:(I)V 7: return public void $init$(); Code: 0: aload_0 1: bipush 42 3: invokeinterface scala#29, 2 // InterfaceMethod T$_setter_$x_$eq:(I)V 8: aload_0 9: bipush 24 11: invokeinterface #24, 2 // InterfaceMethod y_$eq:(I)V 16: return } % qscalac sandbox/test.scala && javap -c T Compiled from "test.scala" public interface T { public abstract void T$_setter_$x_$eq(int); public abstract int x(); public abstract int y(); public abstract void y_$eq(int); public static void $init$(T); Code: 0: aload_0 1: bipush 42 3: invokeinterface #21, 2 // InterfaceMethod T$_setter_$x_$eq:(I)V 8: aload_0 9: bipush 24 11: invokeinterface #23, 2 // InterfaceMethod y_$eq:(I)V 16: return public void $init$(); Code: 0: aload_0 1: invokestatic scala#27 // Method $init$:(LT;)V 4: return } ```
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when AddInterfaces was removed we regressed on being able to compile
why? T will become an interface, and by JVM rules, an interface cannot extend a class, so we need to replace
extends Cwithextends Object. this commit restores the part of AddInterfaces that did that.