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WIP on Java8. Looking at lambda reloading first (required invokedynamic handling)

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This commit is contained in:
Andy Clement
2014-02-13 10:39:32 -08:00
parent 8dff505b88
commit 9774e2a0d4
64 changed files with 745 additions and 140 deletions
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6
j8code/.classpath Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<classpathentry kind="src" path="src"/>
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/J180_b128"/>
<classpathentry kind="output" path="bin"/>
</classpath>

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j8code/.project Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
<name>j8code</name>
<comment></comment>
<projects>
</projects>
<buildSpec>
<buildCommand>
<name>org.eclipse.jdt.core.javabuilder</name>
<arguments>
</arguments>
</buildCommand>
</buildSpec>
<natures>
<nature>org.eclipse.jdt.core.javanature</nature>
</natures>
</projectDescription>

11
j8code/.settings/org.eclipse.jdt.core.prefs Normal file
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eclipse.preferences.version=1
org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=disabled
org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.2
org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
org.eclipse.jdt.core.compiler.compliance=1.4
org.eclipse.jdt.core.compiler.debug.lineNumber=generate
org.eclipse.jdt.core.compiler.debug.localVariable=generate
org.eclipse.jdt.core.compiler.debug.sourceFile=generate
org.eclipse.jdt.core.compiler.problem.assertIdentifier=warning
org.eclipse.jdt.core.compiler.problem.enumIdentifier=warning
org.eclipse.jdt.core.compiler.source=1.3

69
j8code/src/j8code/J8Helper.java Normal file
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package j8code;
import java.lang.invoke.CallSite;
import java.lang.invoke.LambdaMetafactory;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
public class J8Helper {
public static Object simulateInvokeDynamic(Object lookup) {
try {
CallSite callsite = callLambdaMetaFactory(lookup);
// java.lang.invoke.ConstantCallSite@1e965684
// nameAndDescriptor at invokedynamic: m()Lbasic/LambdaA$Foo;
MethodHandles.Lookup caller = (MethodHandles.Lookup)lookup;
return callsite.dynamicInvoker().invokeWithArguments((Object[])null);//asType(MethodType.methodType())invoke(new Object[]{"m", MethodType.methodType(Class.forName("basic.LambdaA$Foo",false,caller.lookupClass().getClassLoader()))});
} catch (Throwable t) {
throw new RuntimeException(t);
}
}
public static CallSite callLambdaMetaFactory(Object lookup) throws Exception {
// At invokedynamic:
// bsmId = 0
// nameAndDescriptor = m()Lbasic/LambdaA$Foo;
// 0: #31 invokestatic java/lang/invoke/LambdaMetafactory.metafactory:
// (Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;
// Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
// Method arguments:
// #32 ()I
// #33 invokestatic basic/LambdaA.lambda$run$0:()I
// #32 ()I
// First two stacked by VM when used with invokedynamic
// 0: #31 invokestatic java/lang/invoke/LambdaMetafactory.metafactory:
// (Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;
// Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
// Method arguments:
// #32 ()I
// #33 invokestatic basic/LambdaA.lambda$run$0:()I
// #32 ()I
// caller = basic.LambdaA (MethodHandles$Lookup)
// invokedName = m (String)
// invokedType = ()Foo (MethodType)
// samMethodType=()int (MethodType)
// implMethod=MethodHandle()int (DirectMethodHandle - membername in this object is "basic.LambdaA.lambda$run$0()int/invokeStatic")
// form members is:
//
// DMH.invokeStatic__I=Lambda(a0:L)=>{
// t1:L=DirectMethodHandle.internalMemberName(a0:L);
// t2:I=MethodHandle.linkToStatic(t1:L);t2:I}
// instantiatedMethodType=()int (MethodType)
MethodHandles.Lookup caller = (MethodHandles.Lookup)lookup;
MethodType invokedType = MethodType.methodType(Class.forName("basic.LambdaA$Foo",false,caller.lookupClass().getClassLoader()));
MethodType samMethodType = MethodType.methodType(Integer.TYPE);
// Cheating here by changing first param to pretend the original type is looking for it rather than the executor
MethodHandle implMethod = caller.findStatic(caller.lookupClass(), "lambda$run$0",MethodType.methodType(Integer.TYPE));
MethodType instantiatedMethodType = MethodType.methodType(Integer.TYPE);
return LambdaMetafactory.metafactory(caller, "m", invokedType, samMethodType, implMethod, instantiatedMethodType);
}
}