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8184777: Factor out species generation logic from BoundMethodHandle
Co-authored-by: John Rose <john.r.rose@oracle.com> Reviewed-by: vlivanov
This commit is contained in:
Claes Redestad
parent
cc59ccb7d4
commit
433bf8ab65
13 changed files with 1550 additions and 655 deletions
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@ -25,25 +25,21 @@
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package java.lang.invoke;
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import jdk.internal.loader.BootLoader;
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import jdk.internal.org.objectweb.asm.ClassWriter;
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import jdk.internal.org.objectweb.asm.FieldVisitor;
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import jdk.internal.org.objectweb.asm.MethodVisitor;
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import jdk.internal.vm.annotation.Stable;
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import sun.invoke.util.ValueConversions;
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import sun.invoke.util.Wrapper;
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import java.lang.invoke.LambdaForm.NamedFunction;
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import java.lang.invoke.MethodHandles.Lookup;
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import java.lang.reflect.Field;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentMap;
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import java.util.function.Function;
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import java.util.ArrayList;
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import java.util.List;
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import static java.lang.invoke.LambdaForm.BasicType;
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import static java.lang.invoke.LambdaForm.BasicType.*;
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import static java.lang.invoke.MethodHandleStatics.*;
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import static jdk.internal.org.objectweb.asm.Opcodes.*;
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import static java.lang.invoke.LambdaForm.BasicType.V_TYPE_NUM;
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import static java.lang.invoke.LambdaForm.BasicType.V_TYPE_NUM;
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import static java.lang.invoke.LambdaForm.BasicType.V_TYPE_NUM;
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import static java.lang.invoke.MethodHandles.Lookup.IMPL_LOOKUP;
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import static java.lang.invoke.MethodHandleNatives.Constants.*;
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import static java.lang.invoke.MethodHandleStatics.newInternalError;
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import static java.lang.invoke.MethodHandleStatics.uncaughtException;
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/**
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* The flavor of method handle which emulates an invoke instruction
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@ -56,7 +52,7 @@ import static jdk.internal.org.objectweb.asm.Opcodes.*;
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/*non-public*/ BoundMethodHandle(MethodType type, LambdaForm form) {
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super(type, form);
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assert(speciesData() == speciesData(form));
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assert(speciesData() == speciesDataFor(form));
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}
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//
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@ -70,13 +66,13 @@ import static jdk.internal.org.objectweb.asm.Opcodes.*;
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case L_TYPE:
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return bindSingle(type, form, x); // Use known fast path.
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case I_TYPE:
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return (BoundMethodHandle) SpeciesData.EMPTY.extendWith(I_TYPE).constructor().invokeBasic(type, form, ValueConversions.widenSubword(x));
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return (BoundMethodHandle) SPECIALIZER.topSpecies().extendWith(I_TYPE_NUM).factory().invokeBasic(type, form, ValueConversions.widenSubword(x));
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case J_TYPE:
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return (BoundMethodHandle) SpeciesData.EMPTY.extendWith(J_TYPE).constructor().invokeBasic(type, form, (long) x);
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return (BoundMethodHandle) SPECIALIZER.topSpecies().extendWith(J_TYPE_NUM).factory().invokeBasic(type, form, (long) x);
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case F_TYPE:
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return (BoundMethodHandle) SpeciesData.EMPTY.extendWith(F_TYPE).constructor().invokeBasic(type, form, (float) x);
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return (BoundMethodHandle) SPECIALIZER.topSpecies().extendWith(F_TYPE_NUM).factory().invokeBasic(type, form, (float) x);
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case D_TYPE:
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return (BoundMethodHandle) SpeciesData.EMPTY.extendWith(D_TYPE).constructor().invokeBasic(type, form, (double) x);
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return (BoundMethodHandle) SPECIALIZER.topSpecies().extendWith(D_TYPE_NUM).factory().invokeBasic(type, form, (double) x);
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default : throw newInternalError("unexpected xtype: " + xtype);
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}
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} catch (Throwable t) {
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@ -98,6 +94,7 @@ import static jdk.internal.org.objectweb.asm.Opcodes.*;
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BoundMethodHandle bindArgumentL(int pos, Object value) {
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return editor().bindArgumentL(this, pos, value);
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}
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/*non-public*/
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BoundMethodHandle bindArgumentI(int pos, int value) {
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return editor().bindArgumentI(this, pos, value);
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@ -114,7 +111,6 @@ import static jdk.internal.org.objectweb.asm.Opcodes.*;
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BoundMethodHandle bindArgumentD(int pos, double value) {
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return editor().bindArgumentD(this, pos, value);
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}
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@Override
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BoundMethodHandle rebind() {
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if (!tooComplex()) {
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@ -137,28 +133,29 @@ import static jdk.internal.org.objectweb.asm.Opcodes.*;
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static BoundMethodHandle makeReinvoker(MethodHandle target) {
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LambdaForm form = DelegatingMethodHandle.makeReinvokerForm(
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target, MethodTypeForm.LF_REBIND,
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Species_L.SPECIES_DATA, Species_L.SPECIES_DATA.getterFunction(0));
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Species_L.BMH_SPECIES, Species_L.BMH_SPECIES.getterFunction(0));
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return Species_L.make(target.type(), form, target);
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}
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/**
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* Return the {@link SpeciesData} instance representing this BMH species. All subclasses must provide a
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* Return the {@link BoundMethodHandle.SpeciesData} instance representing this BMH species. All subclasses must provide a
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* static field containing this value, and they must accordingly implement this method.
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*/
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/*non-public*/ abstract SpeciesData speciesData();
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/*non-public*/ abstract BoundMethodHandle.SpeciesData speciesData();
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/*non-public*/ static SpeciesData speciesData(LambdaForm form) {
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/*non-public*/ static BoundMethodHandle.SpeciesData speciesDataFor(LambdaForm form) {
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Object c = form.names[0].constraint;
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if (c instanceof SpeciesData)
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if (c instanceof SpeciesData) {
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return (SpeciesData) c;
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}
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// if there is no BMH constraint, then use the null constraint
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return SpeciesData.EMPTY;
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return SPECIALIZER.topSpecies();
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}
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/**
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* Return the number of fields in this BMH. Equivalent to speciesData().fieldCount().
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*/
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/*non-public*/ abstract int fieldCount();
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/*non-public*/ final int fieldCount() { return speciesData().fieldCount(); }
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@Override
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Object internalProperties() {
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@ -167,7 +164,7 @@ import static jdk.internal.org.objectweb.asm.Opcodes.*;
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@Override
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final String internalValues() {
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int count = speciesData().fieldCount();
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int count = fieldCount();
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if (count == 1) {
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return "[" + arg(0) + "]";
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}
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@ -180,17 +177,18 @@ import static jdk.internal.org.objectweb.asm.Opcodes.*;
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/*non-public*/ final Object arg(int i) {
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try {
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switch (speciesData().fieldType(i)) {
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case L_TYPE: return speciesData().getters[i].invokeBasic(this);
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case I_TYPE: return (int) speciesData().getters[i].invokeBasic(this);
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case J_TYPE: return (long) speciesData().getters[i].invokeBasic(this);
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case F_TYPE: return (float) speciesData().getters[i].invokeBasic(this);
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case D_TYPE: return (double) speciesData().getters[i].invokeBasic(this);
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Class<?> fieldType = speciesData().fieldTypes().get(i);
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switch (BasicType.basicType(fieldType)) {
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case L_TYPE: return speciesData().getter(i).invokeBasic(this);
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case I_TYPE: return (int) speciesData().getter(i).invokeBasic(this);
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case J_TYPE: return (long) speciesData().getter(i).invokeBasic(this);
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case F_TYPE: return (float) speciesData().getter(i).invokeBasic(this);
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case D_TYPE: return (double) speciesData().getter(i).invokeBasic(this);
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}
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} catch (Throwable ex) {
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throw uncaughtException(ex);
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}
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throw new InternalError("unexpected type: " + speciesData().typeChars+"."+i);
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throw new InternalError("unexpected type: " + speciesData().key()+"."+i);
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}
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//
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@ -210,20 +208,21 @@ import static jdk.internal.org.objectweb.asm.Opcodes.*;
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private // make it private to force users to access the enclosing class first
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static final class Species_L extends BoundMethodHandle {
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final Object argL0;
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private Species_L(MethodType mt, LambdaForm lf, Object argL0) {
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super(mt, lf);
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this.argL0 = argL0;
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}
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@Override
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/*non-public*/ SpeciesData speciesData() {
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return SPECIES_DATA;
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return BMH_SPECIES;
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}
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@Override
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/*non-public*/ int fieldCount() {
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return 1;
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}
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/*non-public*/ static final SpeciesData SPECIES_DATA = new SpeciesData("L", Species_L.class);
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/*non-public*/ static @Stable SpeciesData BMH_SPECIES;
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/*non-public*/ static BoundMethodHandle make(MethodType mt, LambdaForm lf, Object argL0) {
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return new Species_L(mt, lf, argL0);
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}
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@ -234,7 +233,7 @@ import static jdk.internal.org.objectweb.asm.Opcodes.*;
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@Override
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/*non-public*/ final BoundMethodHandle copyWithExtendL(MethodType mt, LambdaForm lf, Object narg) {
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try {
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return (BoundMethodHandle) SPECIES_DATA.extendWith(L_TYPE).constructor().invokeBasic(mt, lf, argL0, narg);
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return (BoundMethodHandle) BMH_SPECIES.extendWith(L_TYPE_NUM).factory().invokeBasic(mt, lf, argL0, narg);
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} catch (Throwable ex) {
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throw uncaughtException(ex);
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}
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@ -242,7 +241,7 @@ import static jdk.internal.org.objectweb.asm.Opcodes.*;
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@Override
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/*non-public*/ final BoundMethodHandle copyWithExtendI(MethodType mt, LambdaForm lf, int narg) {
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try {
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return (BoundMethodHandle) SPECIES_DATA.extendWith(I_TYPE).constructor().invokeBasic(mt, lf, argL0, narg);
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return (BoundMethodHandle) BMH_SPECIES.extendWith(I_TYPE_NUM).factory().invokeBasic(mt, lf, argL0, narg);
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} catch (Throwable ex) {
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throw uncaughtException(ex);
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}
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@ -250,7 +249,7 @@ import static jdk.internal.org.objectweb.asm.Opcodes.*;
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@Override
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/*non-public*/ final BoundMethodHandle copyWithExtendJ(MethodType mt, LambdaForm lf, long narg) {
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try {
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return (BoundMethodHandle) SPECIES_DATA.extendWith(J_TYPE).constructor().invokeBasic(mt, lf, argL0, narg);
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return (BoundMethodHandle) BMH_SPECIES.extendWith(J_TYPE_NUM).factory().invokeBasic(mt, lf, argL0, narg);
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} catch (Throwable ex) {
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throw uncaughtException(ex);
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}
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@ -258,7 +257,7 @@ import static jdk.internal.org.objectweb.asm.Opcodes.*;
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@Override
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/*non-public*/ final BoundMethodHandle copyWithExtendF(MethodType mt, LambdaForm lf, float narg) {
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try {
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return (BoundMethodHandle) SPECIES_DATA.extendWith(F_TYPE).constructor().invokeBasic(mt, lf, argL0, narg);
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return (BoundMethodHandle) BMH_SPECIES.extendWith(F_TYPE_NUM).factory().invokeBasic(mt, lf, argL0, narg);
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} catch (Throwable ex) {
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throw uncaughtException(ex);
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}
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@ -266,7 +265,7 @@ import static jdk.internal.org.objectweb.asm.Opcodes.*;
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@Override
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/*non-public*/ final BoundMethodHandle copyWithExtendD(MethodType mt, LambdaForm lf, double narg) {
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try {
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return (BoundMethodHandle) SPECIES_DATA.extendWith(D_TYPE).constructor().invokeBasic(mt, lf, argL0, narg);
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return (BoundMethodHandle) BMH_SPECIES.extendWith(D_TYPE_NUM).factory().invokeBasic(mt, lf, argL0, narg);
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} catch (Throwable ex) {
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throw uncaughtException(ex);
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}
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@ -277,601 +276,177 @@ import static jdk.internal.org.objectweb.asm.Opcodes.*;
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// BMH species meta-data
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//
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/**
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* Meta-data wrapper for concrete BMH types.
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* Each BMH type corresponds to a given sequence of basic field types (LIJFD).
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* The fields are immutable; their values are fully specified at object construction.
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* Each BMH type supplies an array of getter functions which may be used in lambda forms.
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* A BMH is constructed by cloning a shorter BMH and adding one or more new field values.
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* The shortest possible BMH has zero fields; its class is SimpleMethodHandle.
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* BMH species are not interrelated by subtyping, even though it would appear that
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* a shorter BMH could serve as a supertype of a longer one which extends it.
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*/
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static class SpeciesData {
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private final String typeChars;
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private final BasicType[] typeCodes;
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private final Class<? extends BoundMethodHandle> clazz;
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// Bootstrapping requires circular relations MH -> BMH -> SpeciesData -> MH
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// Therefore, we need a non-final link in the chain. Use array elements.
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@Stable private final MethodHandle[] constructor;
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@Stable private final MethodHandle[] getters;
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@Stable private final NamedFunction[] nominalGetters;
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@Stable private final SpeciesData[] extensions;
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/*non-public*/
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static final class SpeciesData extends ClassSpecializer<BoundMethodHandle, String, SpeciesData>.SpeciesData {
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// This array is filled in lazily, as new species come into being over time.
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@Stable final private SpeciesData[] extensions = new SpeciesData[ARG_TYPE_LIMIT];
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/*non-public*/ int fieldCount() {
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return typeCodes.length;
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}
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/*non-public*/ BasicType fieldType(int i) {
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return typeCodes[i];
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}
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/*non-public*/ char fieldTypeChar(int i) {
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return typeChars.charAt(i);
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}
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String fieldSignature() {
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return typeChars;
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}
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public Class<? extends BoundMethodHandle> fieldHolder() {
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return clazz;
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}
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public String toString() {
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return "SpeciesData<"+fieldSignature()+">";
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public SpeciesData(Specializer outer, String key) {
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outer.super(key);
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}
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/**
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* Return a {@link LambdaForm.Name} containing a {@link LambdaForm.NamedFunction} that
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* represents a MH bound to a generic invoker, which in turn forwards to the corresponding
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* getter.
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*/
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NamedFunction getterFunction(int i) {
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NamedFunction nf = nominalGetters[i];
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assert(nf.memberDeclaringClassOrNull() == fieldHolder());
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assert(nf.returnType() == fieldType(i));
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return nf;
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@Override
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protected String deriveClassName() {
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String typeString = deriveTypeString();
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if (typeString.isEmpty()) {
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return SimpleMethodHandle.class.getName();
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}
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return BoundMethodHandle.class.getName() + "$Species_" + typeString;
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}
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NamedFunction[] getterFunctions() {
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return nominalGetters;
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@Override
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protected List<Class<?>> deriveFieldTypes(String key) {
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ArrayList<Class<?>> types = new ArrayList<>(key.length());
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for (int i = 0; i < key.length(); i++) {
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types.add(basicType(key.charAt(i)).basicTypeClass());
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}
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return types;
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}
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MethodHandle[] getterHandles() { return getters; }
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MethodHandle constructor() {
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return constructor[0];
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@Override
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protected String deriveTypeString() {
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// (If/when we have to add nominal types, just inherit the more complex default.)
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return key();
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}
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static final SpeciesData EMPTY = new SpeciesData("", BoundMethodHandle.class);
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SpeciesData(String types, Class<? extends BoundMethodHandle> clazz) {
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this.typeChars = types;
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this.typeCodes = basicTypes(types);
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this.clazz = clazz;
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if (!INIT_DONE) {
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this.constructor = new MethodHandle[1]; // only one ctor
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this.getters = new MethodHandle[types.length()];
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this.nominalGetters = new NamedFunction[types.length()];
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@Override
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protected MethodHandle deriveTransformHelper(MemberName transform, int whichtm) {
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if (whichtm == Specializer.TN_COPY_NO_EXTEND) {
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return factory();
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} else if (whichtm < ARG_TYPE_LIMIT) {
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return extendWith((byte) whichtm).factory();
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} else {
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this.constructor = Factory.makeCtors(clazz, types, null);
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this.getters = Factory.makeGetters(clazz, types, null);
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this.nominalGetters = Factory.makeNominalGetters(types, null, this.getters);
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}
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this.extensions = new SpeciesData[ARG_TYPE_LIMIT];
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}
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private void initForBootstrap() {
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assert(!INIT_DONE);
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if (constructor() == null) {
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String types = typeChars;
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CACHE.put(types, this);
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Factory.makeCtors(clazz, types, this.constructor);
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Factory.makeGetters(clazz, types, this.getters);
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Factory.makeNominalGetters(types, this.nominalGetters, this.getters);
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throw newInternalError("bad transform");
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}
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}
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private static final ConcurrentMap<String, SpeciesData> CACHE = new ConcurrentHashMap<>();
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private static final boolean INIT_DONE; // set after <clinit> finishes...
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SpeciesData extendWith(byte type) {
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return extendWith(BasicType.basicType(type));
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@Override
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protected <X> List<X> deriveTransformHelperArguments(MemberName transform, int whichtm, List<X> args, List<X> fields) {
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assert(verifyTHAargs(transform, whichtm, args, fields));
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// The rule is really simple: Keep the first two arguments
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// the same, then put in the fields, then put any other argument.
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args.addAll(2, fields);
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return args;
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}
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SpeciesData extendWith(BasicType type) {
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int ord = type.ordinal();
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SpeciesData d = extensions[ord];
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if (d != null) return d;
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extensions[ord] = d = get(typeChars+type.basicTypeChar());
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return d;
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}
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private static SpeciesData get(String types) {
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return CACHE.computeIfAbsent(types, new Function<String, SpeciesData>() {
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@Override
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public SpeciesData apply(String types) {
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Class<? extends BoundMethodHandle> bmhcl = Factory.getConcreteBMHClass(types);
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// SpeciesData instantiation may throw VirtualMachineError because of
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// code cache overflow...
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SpeciesData speciesData = new SpeciesData(types, bmhcl);
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// CHM.computeIfAbsent ensures only one SpeciesData will be set
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// successfully on the concrete BMH class if ever
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Factory.setSpeciesDataToConcreteBMHClass(bmhcl, speciesData);
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// the concrete BMH class is published via SpeciesData instance
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// returned here only after it's SPECIES_DATA field is set
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return speciesData;
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}
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});
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}
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/**
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* This is to be called when assertions are enabled. It checks whether SpeciesData for all of the statically
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* defined species subclasses of BoundMethodHandle has been added to the SpeciesData cache. See below in the
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* static initializer for
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*/
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static boolean speciesDataCachePopulated() {
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Class<BoundMethodHandle> rootCls = BoundMethodHandle.class;
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for (Class<?> c : rootCls.getDeclaredClasses()) {
|
||||
if (rootCls.isAssignableFrom(c)) {
|
||||
final Class<? extends BoundMethodHandle> cbmh = c.asSubclass(BoundMethodHandle.class);
|
||||
SpeciesData d = Factory.getSpeciesDataFromConcreteBMHClass(cbmh);
|
||||
assert(d != null) : cbmh.getName();
|
||||
assert(d.clazz == cbmh);
|
||||
assert(CACHE.get(d.typeChars) == d);
|
||||
}
|
||||
private boolean verifyTHAargs(MemberName transform, int whichtm, List<?> args, List<?> fields) {
|
||||
assert(transform == Specializer.BMH_TRANSFORMS.get(whichtm));
|
||||
assert(args.size() == transform.getMethodType().parameterCount());
|
||||
assert(fields.size() == this.fieldCount());
|
||||
final int MH_AND_LF = 2;
|
||||
if (whichtm == Specializer.TN_COPY_NO_EXTEND) {
|
||||
assert(transform.getMethodType().parameterCount() == MH_AND_LF);
|
||||
} else if (whichtm < ARG_TYPE_LIMIT) {
|
||||
assert(transform.getMethodType().parameterCount() == MH_AND_LF+1);
|
||||
final BasicType type = basicType((byte) whichtm);
|
||||
assert(transform.getParameterTypes()[MH_AND_LF] == type.basicTypeClass());
|
||||
} else {
|
||||
return false;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
/*non-public*/ SpeciesData extendWith(byte typeNum) {
|
||||
SpeciesData sd = extensions[typeNum];
|
||||
if (sd != null) return sd;
|
||||
sd = SPECIALIZER.findSpecies(key() + BasicType.basicType(typeNum).basicTypeChar());
|
||||
extensions[typeNum] = sd;
|
||||
return sd;
|
||||
}
|
||||
}
|
||||
|
||||
/*non-public*/
|
||||
static final Specializer SPECIALIZER = new Specializer();
|
||||
static {
|
||||
SimpleMethodHandle.BMH_SPECIES = BoundMethodHandle.SPECIALIZER.findSpecies("");
|
||||
Species_L.BMH_SPECIES = BoundMethodHandle.SPECIALIZER.findSpecies("L");
|
||||
}
|
||||
|
||||
/*non-public*/
|
||||
static final class Specializer extends ClassSpecializer<BoundMethodHandle, String, SpeciesData> {
|
||||
|
||||
private static final MemberName SPECIES_DATA_ACCESSOR;
|
||||
|
||||
static {
|
||||
// Pre-fill the BMH species-data cache with EMPTY and all BMH's inner subclasses.
|
||||
EMPTY.initForBootstrap();
|
||||
Species_L.SPECIES_DATA.initForBootstrap();
|
||||
// check that all static SpeciesData instances have been initialized
|
||||
assert speciesDataCachePopulated();
|
||||
// Note: Do not simplify this, because INIT_DONE must not be
|
||||
// a compile-time constant during bootstrapping.
|
||||
INIT_DONE = Boolean.TRUE;
|
||||
}
|
||||
}
|
||||
|
||||
static SpeciesData getSpeciesData(String types) {
|
||||
return SpeciesData.get(types);
|
||||
}
|
||||
|
||||
/**
|
||||
* Generation of concrete BMH classes.
|
||||
*
|
||||
* A concrete BMH species is fit for binding a number of values adhering to a
|
||||
* given type pattern. Reference types are erased.
|
||||
*
|
||||
* BMH species are cached by type pattern.
|
||||
*
|
||||
* A BMH species has a number of fields with the concrete (possibly erased) types of
|
||||
* bound values. Setters are provided as an API in BMH. Getters are exposed as MHs,
|
||||
* which can be included as names in lambda forms.
|
||||
*/
|
||||
static class Factory {
|
||||
|
||||
private static final String JLO_SIG = "Ljava/lang/Object;";
|
||||
private static final String MH = "java/lang/invoke/MethodHandle";
|
||||
private static final String MH_SIG = "L"+MH+";";
|
||||
private static final String BMH = "java/lang/invoke/BoundMethodHandle";
|
||||
private static final String BMH_NAME = "java.lang.invoke.BoundMethodHandle";
|
||||
private static final String BMH_SIG = "L"+BMH+";";
|
||||
private static final String SPECIES_DATA = "java/lang/invoke/BoundMethodHandle$SpeciesData";
|
||||
private static final String SPECIES_DATA_SIG = "L"+SPECIES_DATA+";";
|
||||
private static final String STABLE_SIG = "Ljdk/internal/vm/annotation/Stable;";
|
||||
|
||||
private static final String SPECIES_PREFIX_NAME = "Species_";
|
||||
private static final String SPECIES_PREFIX_PATH = BMH + "$" + SPECIES_PREFIX_NAME;
|
||||
private static final String SPECIES_CLASS_PREFIX = BMH_NAME + "$" + SPECIES_PREFIX_NAME;
|
||||
|
||||
private static final String BMHSPECIES_DATA_EWI_SIG = "(B)" + SPECIES_DATA_SIG;
|
||||
private static final String MYSPECIES_DATA_SIG = "()" + SPECIES_DATA_SIG;
|
||||
private static final String INT_SIG = "()I";
|
||||
|
||||
private static final String SIG_INCIPIT = "(Ljava/lang/invoke/MethodType;Ljava/lang/invoke/LambdaForm;";
|
||||
|
||||
private static final String[] E_THROWABLE = new String[] { "java/lang/Throwable" };
|
||||
|
||||
private static final ConcurrentMap<String, Class<? extends BoundMethodHandle>> CLASS_CACHE = new ConcurrentHashMap<>();
|
||||
|
||||
/**
|
||||
* Get a concrete subclass of BMH for a given combination of bound types.
|
||||
*
|
||||
* @param types the type signature, wherein reference types are erased to 'L'
|
||||
* @return the concrete BMH class
|
||||
*/
|
||||
static Class<? extends BoundMethodHandle> getConcreteBMHClass(String types) {
|
||||
// CHM.computeIfAbsent ensures generateConcreteBMHClass is called
|
||||
// only once per key.
|
||||
return CLASS_CACHE.computeIfAbsent(
|
||||
types, new Function<String, Class<? extends BoundMethodHandle>>() {
|
||||
@Override
|
||||
public Class<? extends BoundMethodHandle> apply(String types) {
|
||||
String shortTypes = LambdaForm.shortenSignature(types);
|
||||
String className = SPECIES_CLASS_PREFIX + shortTypes;
|
||||
Class<?> c = BootLoader.loadClassOrNull(className);
|
||||
if (TRACE_RESOLVE) {
|
||||
System.out.println("[BMH_RESOLVE] " + shortTypes +
|
||||
(c != null ? " (success)" : " (fail)") );
|
||||
}
|
||||
if (c != null) {
|
||||
return c.asSubclass(BoundMethodHandle.class);
|
||||
} else {
|
||||
// Not pregenerated, generate the class
|
||||
return generateConcreteBMHClass(shortTypes, types);
|
||||
}
|
||||
}
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* Generate a concrete subclass of BMH for a given combination of bound types.
|
||||
*
|
||||
* A concrete BMH species adheres to the following schema:
|
||||
*
|
||||
* <pre>
|
||||
* class Species_[[types]] extends BoundMethodHandle {
|
||||
* [[fields]]
|
||||
* final SpeciesData speciesData() { return SpeciesData.get("[[types]]"); }
|
||||
* }
|
||||
* </pre>
|
||||
*
|
||||
* The {@code [[types]]} signature is precisely the string that is passed to this
|
||||
* method.
|
||||
*
|
||||
* The {@code [[fields]]} section consists of one field definition per character in
|
||||
* the type signature, adhering to the naming schema described in the definition of
|
||||
* {@link #makeFieldName}.
|
||||
*
|
||||
* For example, a concrete BMH species for two reference and one integral bound values
|
||||
* would have the following shape:
|
||||
*
|
||||
* <pre>
|
||||
* class BoundMethodHandle { ... private static
|
||||
* final class Species_LLI extends BoundMethodHandle {
|
||||
* final Object argL0;
|
||||
* final Object argL1;
|
||||
* final int argI2;
|
||||
* private Species_LLI(MethodType mt, LambdaForm lf, Object argL0, Object argL1, int argI2) {
|
||||
* super(mt, lf);
|
||||
* this.argL0 = argL0;
|
||||
* this.argL1 = argL1;
|
||||
* this.argI2 = argI2;
|
||||
* }
|
||||
* final SpeciesData speciesData() { return SPECIES_DATA; }
|
||||
* final int fieldCount() { return 3; }
|
||||
* @Stable static SpeciesData SPECIES_DATA; // injected afterwards
|
||||
* static BoundMethodHandle make(MethodType mt, LambdaForm lf, Object argL0, Object argL1, int argI2) {
|
||||
* return new Species_LLI(mt, lf, argL0, argL1, argI2);
|
||||
* }
|
||||
* final BoundMethodHandle copyWith(MethodType mt, LambdaForm lf) {
|
||||
* return new Species_LLI(mt, lf, argL0, argL1, argI2);
|
||||
* }
|
||||
* final BoundMethodHandle copyWithExtendL(MethodType mt, LambdaForm lf, Object narg) {
|
||||
* return SPECIES_DATA.extendWith(L_TYPE).constructor().invokeBasic(mt, lf, argL0, argL1, argI2, narg);
|
||||
* }
|
||||
* final BoundMethodHandle copyWithExtendI(MethodType mt, LambdaForm lf, int narg) {
|
||||
* return SPECIES_DATA.extendWith(I_TYPE).constructor().invokeBasic(mt, lf, argL0, argL1, argI2, narg);
|
||||
* }
|
||||
* final BoundMethodHandle copyWithExtendJ(MethodType mt, LambdaForm lf, long narg) {
|
||||
* return SPECIES_DATA.extendWith(J_TYPE).constructor().invokeBasic(mt, lf, argL0, argL1, argI2, narg);
|
||||
* }
|
||||
* final BoundMethodHandle copyWithExtendF(MethodType mt, LambdaForm lf, float narg) {
|
||||
* return SPECIES_DATA.extendWith(F_TYPE).constructor().invokeBasic(mt, lf, argL0, argL1, argI2, narg);
|
||||
* }
|
||||
* public final BoundMethodHandle copyWithExtendD(MethodType mt, LambdaForm lf, double narg) {
|
||||
* return SPECIES_DATA.extendWith(D_TYPE).constructor().invokeBasic(mt, lf, argL0, argL1, argI2, narg);
|
||||
* }
|
||||
* }
|
||||
* </pre>
|
||||
*
|
||||
* @param types the type signature, wherein reference types are erased to 'L'
|
||||
* @return the generated concrete BMH class
|
||||
*/
|
||||
static Class<? extends BoundMethodHandle> generateConcreteBMHClass(String shortTypes,
|
||||
String types) {
|
||||
final String className = speciesInternalClassName(shortTypes);
|
||||
byte[] classFile = generateConcreteBMHClassBytes(shortTypes, types, className);
|
||||
|
||||
// load class
|
||||
InvokerBytecodeGenerator.maybeDump(className, classFile);
|
||||
Class<? extends BoundMethodHandle> bmhClass =
|
||||
UNSAFE.defineClass(className, classFile, 0, classFile.length,
|
||||
BoundMethodHandle.class.getClassLoader(), null)
|
||||
.asSubclass(BoundMethodHandle.class);
|
||||
|
||||
return bmhClass;
|
||||
}
|
||||
|
||||
static String speciesInternalClassName(String shortTypes) {
|
||||
return SPECIES_PREFIX_PATH + shortTypes;
|
||||
}
|
||||
|
||||
static byte[] generateConcreteBMHClassBytes(final String shortTypes,
|
||||
final String types, final String className) {
|
||||
final String sourceFile = SPECIES_PREFIX_NAME + shortTypes;
|
||||
|
||||
final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES);
|
||||
final int NOT_ACC_PUBLIC = 0; // not ACC_PUBLIC
|
||||
cw.visit(V1_6, NOT_ACC_PUBLIC + ACC_FINAL + ACC_SUPER, className, null, BMH, null);
|
||||
cw.visitSource(sourceFile, null);
|
||||
|
||||
// emit static types and SPECIES_DATA fields
|
||||
FieldVisitor fw = cw.visitField(NOT_ACC_PUBLIC + ACC_STATIC, "SPECIES_DATA", SPECIES_DATA_SIG, null, null);
|
||||
fw.visitAnnotation(STABLE_SIG, true);
|
||||
fw.visitEnd();
|
||||
|
||||
// emit bound argument fields
|
||||
for (int i = 0; i < types.length(); ++i) {
|
||||
final char t = types.charAt(i);
|
||||
final String fieldName = makeFieldName(types, i);
|
||||
final String fieldDesc = t == 'L' ? JLO_SIG : String.valueOf(t);
|
||||
cw.visitField(ACC_FINAL, fieldName, fieldDesc, null, null).visitEnd();
|
||||
}
|
||||
|
||||
MethodVisitor mv;
|
||||
|
||||
// emit constructor
|
||||
mv = cw.visitMethod(ACC_PRIVATE, "<init>", makeSignature(types, true), null, null);
|
||||
mv.visitCode();
|
||||
mv.visitVarInsn(ALOAD, 0); // this
|
||||
mv.visitVarInsn(ALOAD, 1); // type
|
||||
mv.visitVarInsn(ALOAD, 2); // form
|
||||
|
||||
mv.visitMethodInsn(INVOKESPECIAL, BMH, "<init>", makeSignature("", true), false);
|
||||
|
||||
for (int i = 0, j = 0; i < types.length(); ++i, ++j) {
|
||||
// i counts the arguments, j counts corresponding argument slots
|
||||
char t = types.charAt(i);
|
||||
mv.visitVarInsn(ALOAD, 0);
|
||||
mv.visitVarInsn(typeLoadOp(t), j + 3); // parameters start at 3
|
||||
mv.visitFieldInsn(PUTFIELD, className, makeFieldName(types, i), typeSig(t));
|
||||
if (t == 'J' || t == 'D') {
|
||||
++j; // adjust argument register access
|
||||
}
|
||||
}
|
||||
|
||||
mv.visitInsn(RETURN);
|
||||
mv.visitMaxs(0, 0);
|
||||
mv.visitEnd();
|
||||
|
||||
// emit implementation of speciesData()
|
||||
mv = cw.visitMethod(NOT_ACC_PUBLIC + ACC_FINAL, "speciesData", MYSPECIES_DATA_SIG, null, null);
|
||||
mv.visitCode();
|
||||
mv.visitFieldInsn(GETSTATIC, className, "SPECIES_DATA", SPECIES_DATA_SIG);
|
||||
mv.visitInsn(ARETURN);
|
||||
mv.visitMaxs(0, 0);
|
||||
mv.visitEnd();
|
||||
|
||||
// emit implementation of fieldCount()
|
||||
mv = cw.visitMethod(NOT_ACC_PUBLIC + ACC_FINAL, "fieldCount", INT_SIG, null, null);
|
||||
mv.visitCode();
|
||||
int fc = types.length();
|
||||
if (fc <= (ICONST_5 - ICONST_0)) {
|
||||
mv.visitInsn(ICONST_0 + fc);
|
||||
} else {
|
||||
mv.visitIntInsn(SIPUSH, fc);
|
||||
}
|
||||
mv.visitInsn(IRETURN);
|
||||
mv.visitMaxs(0, 0);
|
||||
mv.visitEnd();
|
||||
// emit make() ...factory method wrapping constructor
|
||||
mv = cw.visitMethod(NOT_ACC_PUBLIC + ACC_STATIC, "make", makeSignature(types, false), null, null);
|
||||
mv.visitCode();
|
||||
// make instance
|
||||
mv.visitTypeInsn(NEW, className);
|
||||
mv.visitInsn(DUP);
|
||||
// load mt, lf
|
||||
mv.visitVarInsn(ALOAD, 0); // type
|
||||
mv.visitVarInsn(ALOAD, 1); // form
|
||||
// load factory method arguments
|
||||
for (int i = 0, j = 0; i < types.length(); ++i, ++j) {
|
||||
// i counts the arguments, j counts corresponding argument slots
|
||||
char t = types.charAt(i);
|
||||
mv.visitVarInsn(typeLoadOp(t), j + 2); // parameters start at 3
|
||||
if (t == 'J' || t == 'D') {
|
||||
++j; // adjust argument register access
|
||||
}
|
||||
}
|
||||
|
||||
// finally, invoke the constructor and return
|
||||
mv.visitMethodInsn(INVOKESPECIAL, className, "<init>", makeSignature(types, true), false);
|
||||
mv.visitInsn(ARETURN);
|
||||
mv.visitMaxs(0, 0);
|
||||
mv.visitEnd();
|
||||
|
||||
// emit copyWith()
|
||||
mv = cw.visitMethod(NOT_ACC_PUBLIC + ACC_FINAL, "copyWith", makeSignature("", false), null, null);
|
||||
mv.visitCode();
|
||||
// make instance
|
||||
mv.visitTypeInsn(NEW, className);
|
||||
mv.visitInsn(DUP);
|
||||
// load mt, lf
|
||||
mv.visitVarInsn(ALOAD, 1);
|
||||
mv.visitVarInsn(ALOAD, 2);
|
||||
// put fields on the stack
|
||||
emitPushFields(types, className, mv);
|
||||
// finally, invoke the constructor and return
|
||||
mv.visitMethodInsn(INVOKESPECIAL, className, "<init>", makeSignature(types, true), false);
|
||||
mv.visitInsn(ARETURN);
|
||||
mv.visitMaxs(0, 0);
|
||||
mv.visitEnd();
|
||||
|
||||
// for each type, emit copyWithExtendT()
|
||||
for (BasicType type : BasicType.ARG_TYPES) {
|
||||
int ord = type.ordinal();
|
||||
char btChar = type.basicTypeChar();
|
||||
mv = cw.visitMethod(NOT_ACC_PUBLIC + ACC_FINAL, "copyWithExtend" + btChar, makeSignature(String.valueOf(btChar), false), null, E_THROWABLE);
|
||||
mv.visitCode();
|
||||
// return SPECIES_DATA.extendWith(t).constructor().invokeBasic(mt, lf, argL0, ..., narg)
|
||||
// obtain constructor
|
||||
mv.visitFieldInsn(GETSTATIC, className, "SPECIES_DATA", SPECIES_DATA_SIG);
|
||||
int iconstInsn = ICONST_0 + ord;
|
||||
assert(iconstInsn <= ICONST_5);
|
||||
mv.visitInsn(iconstInsn);
|
||||
mv.visitMethodInsn(INVOKEVIRTUAL, SPECIES_DATA, "extendWith", BMHSPECIES_DATA_EWI_SIG, false);
|
||||
mv.visitMethodInsn(INVOKEVIRTUAL, SPECIES_DATA, "constructor", "()" + MH_SIG, false);
|
||||
// load mt, lf
|
||||
mv.visitVarInsn(ALOAD, 1);
|
||||
mv.visitVarInsn(ALOAD, 2);
|
||||
// put fields on the stack
|
||||
emitPushFields(types, className, mv);
|
||||
// put narg on stack
|
||||
mv.visitVarInsn(typeLoadOp(btChar), 3);
|
||||
// finally, invoke the constructor and return
|
||||
mv.visitMethodInsn(INVOKEVIRTUAL, MH, "invokeBasic", makeSignature(types + btChar, false), false);
|
||||
mv.visitInsn(ARETURN);
|
||||
mv.visitMaxs(0, 0);
|
||||
mv.visitEnd();
|
||||
}
|
||||
|
||||
cw.visitEnd();
|
||||
|
||||
return cw.toByteArray();
|
||||
}
|
||||
|
||||
private static int typeLoadOp(char t) {
|
||||
switch (t) {
|
||||
case 'L': return ALOAD;
|
||||
case 'I': return ILOAD;
|
||||
case 'J': return LLOAD;
|
||||
case 'F': return FLOAD;
|
||||
case 'D': return DLOAD;
|
||||
default : throw newInternalError("unrecognized type " + t);
|
||||
}
|
||||
}
|
||||
|
||||
private static void emitPushFields(String types, String className, MethodVisitor mv) {
|
||||
for (int i = 0; i < types.length(); ++i) {
|
||||
char tc = types.charAt(i);
|
||||
mv.visitVarInsn(ALOAD, 0);
|
||||
mv.visitFieldInsn(GETFIELD, className, makeFieldName(types, i), typeSig(tc));
|
||||
}
|
||||
}
|
||||
|
||||
static String typeSig(char t) {
|
||||
return t == 'L' ? JLO_SIG : String.valueOf(t);
|
||||
}
|
||||
|
||||
//
|
||||
// Getter MH generation.
|
||||
//
|
||||
|
||||
private static MethodHandle makeGetter(Class<?> cbmhClass, String types, int index) {
|
||||
String fieldName = makeFieldName(types, index);
|
||||
Class<?> fieldType = Wrapper.forBasicType(types.charAt(index)).primitiveType();
|
||||
try {
|
||||
return LOOKUP.findGetter(cbmhClass, fieldName, fieldType);
|
||||
} catch (NoSuchFieldException | IllegalAccessException e) {
|
||||
throw newInternalError(e);
|
||||
}
|
||||
}
|
||||
|
||||
static MethodHandle[] makeGetters(Class<?> cbmhClass, String types, MethodHandle[] mhs) {
|
||||
if (mhs == null) mhs = new MethodHandle[types.length()];
|
||||
for (int i = 0; i < mhs.length; ++i) {
|
||||
mhs[i] = makeGetter(cbmhClass, types, i);
|
||||
assert(mhs[i].internalMemberName().getDeclaringClass() == cbmhClass);
|
||||
}
|
||||
return mhs;
|
||||
}
|
||||
|
||||
static MethodHandle[] makeCtors(Class<? extends BoundMethodHandle> cbmh, String types, MethodHandle mhs[]) {
|
||||
if (mhs == null) mhs = new MethodHandle[1];
|
||||
if (types.equals("")) return mhs; // hack for empty BMH species
|
||||
mhs[0] = makeCbmhCtor(cbmh, types);
|
||||
return mhs;
|
||||
}
|
||||
|
||||
static NamedFunction[] makeNominalGetters(String types, NamedFunction[] nfs, MethodHandle[] getters) {
|
||||
if (nfs == null) nfs = new NamedFunction[types.length()];
|
||||
for (int i = 0; i < nfs.length; ++i) {
|
||||
nfs[i] = new NamedFunction(getters[i]);
|
||||
}
|
||||
return nfs;
|
||||
}
|
||||
|
||||
//
|
||||
// Auxiliary methods.
|
||||
//
|
||||
|
||||
static SpeciesData getSpeciesDataFromConcreteBMHClass(Class<? extends BoundMethodHandle> cbmh) {
|
||||
try {
|
||||
Field F_SPECIES_DATA = cbmh.getDeclaredField("SPECIES_DATA");
|
||||
return (SpeciesData) F_SPECIES_DATA.get(null);
|
||||
SPECIES_DATA_ACCESSOR = IMPL_LOOKUP.resolveOrFail(REF_invokeVirtual, BoundMethodHandle.class,
|
||||
"speciesData", MethodType.methodType(BoundMethodHandle.SpeciesData.class));
|
||||
} catch (ReflectiveOperationException ex) {
|
||||
throw newInternalError(ex);
|
||||
throw newInternalError("Bootstrap link error", ex);
|
||||
}
|
||||
}
|
||||
|
||||
static void setSpeciesDataToConcreteBMHClass(Class<? extends BoundMethodHandle> cbmh, SpeciesData speciesData) {
|
||||
private Specializer() {
|
||||
super( // Reified type parameters:
|
||||
BoundMethodHandle.class, String.class, BoundMethodHandle.SpeciesData.class,
|
||||
// Principal constructor type:
|
||||
MethodType.methodType(void.class, MethodType.class, LambdaForm.class),
|
||||
// Required linkage between class and species:
|
||||
SPECIES_DATA_ACCESSOR,
|
||||
"BMH_SPECIES",
|
||||
BMH_TRANSFORMS);
|
||||
}
|
||||
|
||||
@Override
|
||||
protected String topSpeciesKey() {
|
||||
return "";
|
||||
}
|
||||
|
||||
@Override
|
||||
protected BoundMethodHandle.SpeciesData newSpeciesData(String key) {
|
||||
return new BoundMethodHandle.SpeciesData(this, key);
|
||||
}
|
||||
|
||||
static final List<MemberName> BMH_TRANSFORMS;
|
||||
static final int TN_COPY_NO_EXTEND = V_TYPE_NUM;
|
||||
static {
|
||||
final Class<BoundMethodHandle> BMH = BoundMethodHandle.class;
|
||||
// copyWithExtendLIJFD + copyWith
|
||||
try {
|
||||
Field F_SPECIES_DATA = cbmh.getDeclaredField("SPECIES_DATA");
|
||||
// ## FIXME: annotation parser can't create proxy classes until module system is fully initialzed
|
||||
// assert F_SPECIES_DATA.getDeclaredAnnotation(Stable.class) != null;
|
||||
F_SPECIES_DATA.set(null, speciesData);
|
||||
BMH_TRANSFORMS = List.of(
|
||||
IMPL_LOOKUP.resolveOrFail(REF_invokeVirtual, BMH, "copyWithExtendL", MethodType.methodType(BMH, MethodType.class, LambdaForm.class, Object.class)),
|
||||
IMPL_LOOKUP.resolveOrFail(REF_invokeVirtual, BMH, "copyWithExtendI", MethodType.methodType(BMH, MethodType.class, LambdaForm.class, int.class)),
|
||||
IMPL_LOOKUP.resolveOrFail(REF_invokeVirtual, BMH, "copyWithExtendJ", MethodType.methodType(BMH, MethodType.class, LambdaForm.class, long.class)),
|
||||
IMPL_LOOKUP.resolveOrFail(REF_invokeVirtual, BMH, "copyWithExtendF", MethodType.methodType(BMH, MethodType.class, LambdaForm.class, float.class)),
|
||||
IMPL_LOOKUP.resolveOrFail(REF_invokeVirtual, BMH, "copyWithExtendD", MethodType.methodType(BMH, MethodType.class, LambdaForm.class, double.class)),
|
||||
IMPL_LOOKUP.resolveOrFail(REF_invokeVirtual, BMH, "copyWith", MethodType.methodType(BMH, MethodType.class, LambdaForm.class))
|
||||
);
|
||||
} catch (ReflectiveOperationException ex) {
|
||||
throw newInternalError(ex);
|
||||
throw newInternalError("Failed resolving copyWith methods", ex);
|
||||
}
|
||||
|
||||
// as it happens, there is one transform per BasicType including V_TYPE
|
||||
assert(BMH_TRANSFORMS.size() == TYPE_LIMIT);
|
||||
}
|
||||
|
||||
/**
|
||||
* Field names in concrete BMHs adhere to this pattern:
|
||||
* arg + type + index
|
||||
* where type is a single character (L, I, J, F, D).
|
||||
* Generation of concrete BMH classes.
|
||||
*
|
||||
* A concrete BMH species is fit for binding a number of values adhering to a
|
||||
* given type pattern. Reference types are erased.
|
||||
*
|
||||
* BMH species are cached by type pattern.
|
||||
*
|
||||
* A BMH species has a number of fields with the concrete (possibly erased) types of
|
||||
* bound values. Setters are provided as an API in BMH. Getters are exposed as MHs,
|
||||
* which can be included as names in lambda forms.
|
||||
*/
|
||||
private static String makeFieldName(String types, int index) {
|
||||
assert index >= 0 && index < types.length();
|
||||
return "arg" + types.charAt(index) + index;
|
||||
}
|
||||
|
||||
private static String makeSignature(String types, boolean ctor) {
|
||||
StringBuilder buf = new StringBuilder(SIG_INCIPIT);
|
||||
int len = types.length();
|
||||
for (int i = 0; i < len; i++) {
|
||||
buf.append(typeSig(types.charAt(i)));
|
||||
}
|
||||
return buf.append(')').append(ctor ? "V" : BMH_SIG).toString();
|
||||
}
|
||||
|
||||
private static MethodType makeConstructorType(String types) {
|
||||
int length = types.length();
|
||||
Class<?> ptypes[] = new Class<?>[length + 2];
|
||||
ptypes[0] = MethodType.class;
|
||||
ptypes[1] = LambdaForm.class;
|
||||
for (int i = 0; i < length; i++) {
|
||||
ptypes[i + 2] = BasicType.basicType(types.charAt(i)).basicTypeClass();
|
||||
}
|
||||
return MethodType.makeImpl(BoundMethodHandle.class, ptypes, true);
|
||||
}
|
||||
|
||||
static MethodHandle makeCbmhCtor(Class<? extends BoundMethodHandle> cbmh, String types) {
|
||||
try {
|
||||
return LOOKUP.findStatic(cbmh, "make", makeConstructorType(types));
|
||||
} catch (NoSuchMethodException | IllegalAccessException | IllegalArgumentException | TypeNotPresentException e) {
|
||||
throw newInternalError(e);
|
||||
class Factory extends ClassSpecializer<BoundMethodHandle, String, BoundMethodHandle.SpeciesData>.Factory {
|
||||
@Override
|
||||
protected String chooseFieldName(Class<?> type, int index) {
|
||||
return "arg" + super.chooseFieldName(type, index);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static final Lookup LOOKUP = Lookup.IMPL_LOOKUP;
|
||||
@Override
|
||||
protected Factory makeFactory() {
|
||||
return new Factory();
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* All subclasses must provide such a value describing their type signature.
|
||||
*/
|
||||
static final SpeciesData SPECIES_DATA = SpeciesData.EMPTY;
|
||||
|
||||
private static final SpeciesData[] SPECIES_DATA_CACHE = new SpeciesData[6];
|
||||
private static SpeciesData checkCache(int size, String types) {
|
||||
int idx = size - 1;
|
||||
SpeciesData data = SPECIES_DATA_CACHE[idx];
|
||||
if (data != null) return data;
|
||||
SPECIES_DATA_CACHE[idx] = data = getSpeciesData(types);
|
||||
return data;
|
||||
}
|
||||
static SpeciesData speciesData_L() { return checkCache(1, "L"); }
|
||||
static SpeciesData speciesData_LL() { return checkCache(2, "LL"); }
|
||||
static SpeciesData speciesData_LLL() { return checkCache(3, "LLL"); }
|
||||
static SpeciesData speciesData_LLLL() { return checkCache(4, "LLLL"); }
|
||||
static SpeciesData speciesData_LLLLL() { return checkCache(5, "LLLLL"); }
|
||||
static SpeciesData speciesData_L() { return Species_L.BMH_SPECIES; }
|
||||
static SpeciesData speciesData_LL() { return SPECIALIZER.findSpecies("LL"); }
|
||||
static SpeciesData speciesData_LLL() { return SPECIALIZER.findSpecies("LLL"); }
|
||||
static SpeciesData speciesData_LLLL() { return SPECIALIZER.findSpecies("LLLL"); }
|
||||
static SpeciesData speciesData_LLLLL() { return SPECIALIZER.findSpecies("LLLLL"); }
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue