Examples of java.lang.invoke.MutableCallSite

java.lang.invoke.MutableCallSite
ation can be continued indefinitely)}
The same call site may be used in several places at once.
```
 {@code MethodType MT_str2 = MethodType.methodType(String.class, String.class); MethodHandle MH_cat = lookup().findVirtual(String.class, "concat", methodType(String.class, String.class)); MethodHandle MH_dear = MethodHandles.insertArguments(MH_cat, 1, ", dear?"); MethodHandle worker2 = MethodHandles.filterReturnValue(MH_name, MH_dear); assertEquals("Fred, dear?", (String) worker2.invokeExact()); name.setTarget(MethodHandles.constant(String.class, "Wilma")); assertEquals("WILMA", (String) worker1.invokeExact()); assertEquals("Wilma, dear?", (String) worker2.invokeExact());}
```
Non-synchronization of target values: A write to a mutable call site's target does not force other threads to become aware of the updated value. Threads which do not perform suitable synchronization actions relative to the updated call site may cache the old target value and delay their use of the new target value indefinitely. (This is a normal consequence of the Java Memory Model as applied to object fields.)
The {@link #syncAll syncAll} operation provides a way to force threadsto accept a new target value, even if there is no other synchronization.
For target values which will be frequently updated, consider using a {@linkplain VolatileCallSite volatile call site} instead. @author John Rose, JSR 292 EG

        site.setTarget(init);
        return site;
    }
    
    public static CallSite getStaticScopeBootstrap(Lookup lookup, String name, MethodType type, String scopeString, int index) {
        MutableCallSite site = new MutableCallSite(type);
        MethodHandle init = findStatic(
                InvokeDynamicSupport.class,
                "initStaticScope",
                methodType(StaticScope.class, MutableCallSite.class, AbstractScript.class, ThreadContext.class, StaticScope.class, String.class, int.class));
        init = insertArguments(init, 4, scopeString, index);
        init = insertArguments(
                init,
                0,
                site);
        site.setTarget(init);
        return site;
    }

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        site.setTarget(init);
        return site;
    }
    
    public static CallSite getLoadStaticScopeBootstrap(Lookup lookup, String name, MethodType type, int index) {
        MutableCallSite site = new MutableCallSite(type);
        MethodHandle init = findStatic(
                InvokeDynamicSupport.class,
                "loadStaticScope",
                methodType(StaticScope.class, MutableCallSite.class, AbstractScript.class, int.class));
        init = insertArguments(init, 2, index);
        init = insertArguments(
                init,
                0,
                site);
        site.setTarget(init);
        return site;
    }

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    public static CallSite getStringBootstrap(Lookup lookup, String name, MethodType type, String asString, String encodingName, int codeRange) {
        byte[] bytes = Helpers.stringToRawBytes(asString);
        Encoding encoding = EncodingDB.getEncodings().get(encodingName.getBytes()).getEncoding();
        ByteList byteList = new ByteList(bytes, encoding);
        
        MutableCallSite site = new MutableCallSite(type);
        MethodHandle init = findStatic(
                InvokeDynamicSupport.class,
                "newString",
                methodType(RubyString.class, ThreadContext.class, ByteList.class, int.class));
        init = insertArguments(init, 1, byteList, codeRange);
        site.setTarget(init);
        return site;
    }

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    public static CallSite getFrozenStringBootstrap(Lookup lookup, String name, MethodType type, String asString, String encodingName, int codeRange) {
        byte[] bytes = Helpers.stringToRawBytes(asString);
        Encoding encoding = EncodingDB.getEncodings().get(encodingName.getBytes()).getEncoding();
        ByteList byteList = new ByteList(bytes, encoding);
        
        MutableCallSite site = new MutableCallSite(type);
        MethodHandle init = findStatic(
                InvokeDynamicSupport.class,
                "newFrozenString",
                methodType(RubyString.class, ThreadContext.class, MutableCallSite.class, ByteList.class, int.class));
        init = insertArguments(init, 1, site, byteList, codeRange);
        site.setTarget(init);
        return site;
    }

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    }
    
    public static CallSite getEncodingBootstrap(Lookup lookup, String name, MethodType type, String encodingName) {
        Encoding encoding = EncodingDB.getEncodings().get(encodingName.getBytes()).getEncoding();
        
        MutableCallSite site = new MutableCallSite(type);
        MethodHandle init = findStatic(
                InvokeDynamicSupport.class,
                "initEncoding",
                methodType(RubyEncoding.class, MutableCallSite.class, ThreadContext.class, Encoding.class));
        init = insertArguments(init, 2, encoding);
        init = insertArguments(
                init,
                0,
                site);
        site.setTarget(init);
        return site;
    }

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        site.setTarget(init);
        return site;
    }
    
    public static CallSite getBlockBodyBootstrap(Lookup lookup, String name, MethodType type, String descriptor) {
        MutableCallSite site = new MutableCallSite(type);
        MethodHandle init = findStatic(
                InvokeDynamicSupport.class,
                "initBlockBody",
                methodType(BlockBody.class, MutableCallSite.class, Object.class, ThreadContext.class, StaticScope.class, String.class));
        init = insertArguments(init, 4, descriptor);
        init = insertArguments(
                init,
                0,
                site);
        site.setTarget(init);
        return site;
    }

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        site.setTarget(init);
        return site;
    }
    
    public static CallSite getBlockBody19Bootstrap(Lookup lookup, String name, MethodType type, String descriptor) {
        MutableCallSite site = new MutableCallSite(type);
        MethodHandle init = findStatic(
                InvokeDynamicSupport.class,
                "initBlockBody19",
                methodType(BlockBody.class, MutableCallSite.class, Object.class, ThreadContext.class, StaticScope.class, String.class));
        init = insertArguments(init, 4, descriptor);
        init = insertArguments(
                init,
                0,
                site);
        site.setTarget(init);
        return site;
    }

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    public static CallSite loadBooleanBootstrap(Lookup lookup, String name, MethodType type) throws Throwable {
        String[] names = name.split(":");
        String operation = names[0];
        boolean value = Boolean.parseBoolean(names[1]);
        MutableCallSite site = new MutableCallSite(type);
        MethodHandle handle;
        
        if (operation.equals("loadBoolean")) {
            handle = lookup.findStatic(InvokeDynamicSupport.class, "loadBoolean", methodType(RubyBoolean.class, MutableCallSite.class, boolean.class, ThreadContext.class));
        } else {
            throw new RuntimeException("invalid variable access type");
        }
        
        handle = insertArguments(handle, 0, site, value);
        site.setTarget(handle);
        
        return site;
    }

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    public static boolean getGlobalBooleanUncached(GlobalVariable variable) throws Throwable {
        return variable.getAccessor().getValue().isTrue();
    }


    public static CallSite checkpointBootstrap(Lookup lookup, String name, MethodType type) throws Throwable {
        MutableCallSite site = new MutableCallSite(type);
        MethodHandle handle = lookup.findStatic(InvokeDynamicSupport.class, "checkpointFallback", methodType(void.class, MutableCallSite.class, ThreadContext.class));
        
        handle = handle.bindTo(site);
        site.setTarget(handle);
        
        return site;
    }

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        }
        return result;
    }


    public static CallSite genMH(SephObject marker) {
        MutableCallSite mcs = new MutableCallSite(methodType(SephObject.class, SephObject.class, SThread.class));
        MethodHandle _test = dropArguments(REF_EQ.bindTo(marker), 1, SThread.class);
        MethodHandle combiner = filterReturnValue(dropArguments(THREAD_TAIL_GETTER, 0, SephObject.class), exactInvoker(methodType(SephObject.class)));
        MethodHandle _then = foldArguments(dropArguments(mcs.dynamicInvoker(), 1, SephObject.class), combiner);
        MethodHandle _else = dropArguments(identity(SephObject.class), 1, SThread.class);
        MethodHandle pumper = guardWithTest(_test,
                                            _then,
                                            _else);
        mcs.setTarget(pumper);
        return mcs;
    }

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Related Classes of java.lang.invoke.MutableCallSite

org.jruby.ir.targets.Bootstrap

org.jruby.runtime.invokedynamic.InvokeDynamicSupport

seph.lang.compiler.SephCallSite

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