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⏎ java/lang/invoke/LambdaFormEditor.java
/*
* Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*/
package java.lang.invoke;
import sun.invoke.util.Wrapper;
import java.lang.ref.SoftReference;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.TreeMap;
import java.util.concurrent.ConcurrentHashMap;
import static java.lang.invoke.LambdaForm.*;
import static java.lang.invoke.LambdaForm.BasicType.*;
import static java.lang.invoke.MethodHandleImpl.Intrinsic;
import static java.lang.invoke.MethodHandleImpl.NF_loop;
import static java.lang.invoke.MethodHandleImpl.makeIntrinsic;
/** Transforms on LFs.
* A lambda-form editor can derive new LFs from its base LF.
* The editor can cache derived LFs, which simplifies the reuse of their underlying bytecodes.
* To support this caching, a LF has an optional pointer to its editor.
*/
class LambdaFormEditor {
final LambdaForm lambdaForm;
private LambdaFormEditor(LambdaForm lambdaForm) {
this.lambdaForm = lambdaForm;
}
// Factory method.
static LambdaFormEditor lambdaFormEditor(LambdaForm lambdaForm) {
// TO DO: Consider placing intern logic here, to cut down on duplication.
// lambdaForm = findPreexistingEquivalent(lambdaForm)
// Always use uncustomized version for editing.
// It helps caching and customized LambdaForms reuse transformCache field to keep a link to uncustomized version.
return new LambdaFormEditor(lambdaForm.uncustomize());
}
// Transform types
// maybe add more for guard with test, catch exception, pointwise type conversions
private static final byte
BIND_ARG = 1,
ADD_ARG = 2,
DUP_ARG = 3,
SPREAD_ARGS = 4,
FILTER_ARG = 5,
FILTER_RETURN = 6,
FILTER_RETURN_TO_ZERO = 7,
COLLECT_ARGS = 8,
COLLECT_ARGS_TO_VOID = 9,
COLLECT_ARGS_TO_ARRAY = 10,
FOLD_ARGS = 11,
FOLD_ARGS_TO_VOID = 12,
PERMUTE_ARGS = 13,
LOCAL_TYPES = 14,
FOLD_SELECT_ARGS = 15,
FOLD_SELECT_ARGS_TO_VOID = 16,
FILTER_SELECT_ARGS = 17,
REPEAT_FILTER_ARGS = 18;
/**
* A description of a cached transform, possibly associated with the result of the transform.
* The logical content is a sequence of byte values, starting with a kind value.
* The sequence is unterminated, ending with an indefinite number of zero bytes.
* Sequences that are simple (short enough and with small enough values) pack into a 64-bit long.
*
* Tightly coupled with the TransformKey class, which is used to lookup existing
* Transforms.
*/
private static final class Transform extends SoftReference<LambdaForm> {
final long packedBytes;
final byte[] fullBytes;
private Transform(long packedBytes, byte[] fullBytes, LambdaForm result) {
super(result);
this.packedBytes = packedBytes;
this.fullBytes = fullBytes;
}
@Override
public boolean equals(Object obj) {
if (obj instanceof TransformKey) {
return equals((TransformKey) obj);
}
return obj instanceof Transform && equals((Transform)obj);
}
private boolean equals(TransformKey that) {
return this.packedBytes == that.packedBytes && Arrays.equals(this.fullBytes, that.fullBytes);
}
private boolean equals(Transform that) {
return this.packedBytes == that.packedBytes && Arrays.equals(this.fullBytes, that.fullBytes);
}
@Override
public int hashCode() {
if (packedBytes != 0) {
assert(fullBytes == null);
return Long.hashCode(packedBytes);
}
return Arrays.hashCode(fullBytes);
}
@Override
public String toString() {
StringBuilder buf = new StringBuilder();
buf.append(new TransformKey(packedBytes, fullBytes).toString());
LambdaForm result = get();
if (result != null) {
buf.append(" result=");
buf.append(result);
}
return buf.toString();
}
}
/**
* Used as a lookup key to find existing Transforms
*/
private static final class TransformKey {
final long packedBytes;
final byte[] fullBytes;
private TransformKey(long packedBytes) {
this.packedBytes = packedBytes;
this.fullBytes = null;
}
private TransformKey(byte[] fullBytes) {
this.fullBytes = fullBytes;
this.packedBytes = 0;
}
private TransformKey(long packedBytes, byte[] fullBytes) {
this.fullBytes = fullBytes;
this.packedBytes = packedBytes;
}
private static byte bval(int b) {
assert((b & 0xFF) == b); // incoming value must fit in *unsigned* byte
return (byte)b;
}
static TransformKey of(byte k, int b1) {
byte b0 = bval(k);
if (inRange(b0 | b1))
return new TransformKey(packedBytes(b0, b1));
else
return new TransformKey(fullBytes(b0, b1));
}
static TransformKey of(byte b0, int b1, int b2) {
if (inRange(b0 | b1 | b2))
return new TransformKey(packedBytes(b0, b1, b2));
else
return new TransformKey(fullBytes(b0, b1, b2));
}
static TransformKey of(byte b0, int b1, int b2, int b3) {
if (inRange(b0 | b1 | b2 | b3))
return new TransformKey(packedBytes(b0, b1, b2, b3));
else
return new TransformKey(fullBytes(b0, b1, b2, b3));
}
private static final byte[] NO_BYTES = {};
static TransformKey of(byte kind, int... b123) {
return ofBothArrays(kind, b123, NO_BYTES);
}
static TransformKey of(byte kind, int b1, int[] b23456) {
byte[] fullBytes = new byte[b23456.length + 2];
fullBytes[0] = kind;
fullBytes[1] = bval(b1);
for (int i = 0; i < b23456.length; i++) {
fullBytes[i + 2] = TransformKey.bval(b23456[i]);
}
long packedBytes = packedBytes(fullBytes);
if (packedBytes != 0)
return new TransformKey(packedBytes);
else
return new TransformKey(fullBytes);
}
static TransformKey of(byte kind, int b1, int b2, byte[] b345) {
return ofBothArrays(kind, new int[]{ b1, b2 }, b345);
}
private static TransformKey ofBothArrays(byte kind, int[] b123, byte[] b456) {
byte[] fullBytes = new byte[1 + b123.length + b456.length];
int i = 0;
fullBytes[i++] = bval(kind);
for (int bv : b123) {
fullBytes[i++] = bval(bv);
}
for (byte bv : b456) {
fullBytes[i++] = bv;
}
long packedBytes = packedBytes(fullBytes);
if (packedBytes != 0)
return new TransformKey(packedBytes);
else
return new TransformKey(fullBytes);
}
private static final boolean STRESS_TEST = false; // turn on to disable most packing
private static final int
PACKED_BYTE_SIZE = (STRESS_TEST ? 2 : 4),
PACKED_BYTE_MASK = (1 << PACKED_BYTE_SIZE) - 1,
PACKED_BYTE_MAX_LENGTH = (STRESS_TEST ? 3 : 64 / PACKED_BYTE_SIZE);
private static long packedBytes(byte[] bytes) {
if (!inRange(bytes[0]) || bytes.length > PACKED_BYTE_MAX_LENGTH)
return 0;
long pb = 0;
int bitset = 0;
for (int i = 0; i < bytes.length; i++) {
int b = bytes[i] & 0xFF;
bitset |= b;
pb |= (long)b << (i * PACKED_BYTE_SIZE);
}
if (!inRange(bitset))
return 0;
return pb;
}
private static long packedBytes(int b0, int b1) {
assert(inRange(b0 | b1));
return ( (b0 << 0*PACKED_BYTE_SIZE)
| (b1 << 1*PACKED_BYTE_SIZE));
}
private static long packedBytes(int b0, int b1, int b2) {
assert(inRange(b0 | b1 | b2));
return ( (b0 << 0*PACKED_BYTE_SIZE)
| (b1 << 1*PACKED_BYTE_SIZE)
| (b2 << 2*PACKED_BYTE_SIZE));
}
private static long packedBytes(int b0, int b1, int b2, int b3) {
assert(inRange(b0 | b1 | b2 | b3));
return ( (b0 << 0*PACKED_BYTE_SIZE)
| (b1 << 1*PACKED_BYTE_SIZE)
| (b2 << 2*PACKED_BYTE_SIZE)
| (b3 << 3*PACKED_BYTE_SIZE));
}
private static boolean inRange(int bitset) {
assert((bitset & 0xFF) == bitset); // incoming values must fit in *unsigned* byte
return ((bitset & ~PACKED_BYTE_MASK) == 0);
}
private static byte[] fullBytes(int... byteValues) {
byte[] bytes = new byte[byteValues.length];
int i = 0;
for (int bv : byteValues) {
bytes[i++] = bval(bv);
}
assert(packedBytes(bytes) == 0);
return bytes;
}
Transform withResult(LambdaForm result) {
return new Transform(this.packedBytes, this.fullBytes, result);
}
@Override
public String toString() {
StringBuilder buf = new StringBuilder();
long bits = packedBytes;
if (bits != 0) {
buf.append("(");
while (bits != 0) {
buf.append(bits & PACKED_BYTE_MASK);
bits >>>= PACKED_BYTE_SIZE;
if (bits != 0) buf.append(",");
}
buf.append(")");
}
if (fullBytes != null) {
buf.append("unpacked");
buf.append(Arrays.toString(fullBytes));
}
return buf.toString();
}
@Override
public boolean equals(Object obj) {
if (obj instanceof TransformKey) {
return equals((TransformKey) obj);
}
return obj instanceof Transform && equals((Transform)obj);
}
private boolean equals(TransformKey that) {
return this.packedBytes == that.packedBytes && Arrays.equals(this.fullBytes, that.fullBytes);
}
private boolean equals(Transform that) {
return this.packedBytes == that.packedBytes && Arrays.equals(this.fullBytes, that.fullBytes);
}
@Override
public int hashCode() {
if (packedBytes != 0) {
assert(fullBytes == null);
return Long.hashCode(packedBytes);
}
return Arrays.hashCode(fullBytes);
}
}
/** Find a previously cached transform equivalent to the given one, and return its result. */
private LambdaForm getInCache(TransformKey key) {
// The transformCache is one of null, Transform, Transform[], or ConcurrentHashMap.
Object c = lambdaForm.transformCache;
Transform k = null;
if (c instanceof ConcurrentHashMap) {
@SuppressWarnings("unchecked")
ConcurrentHashMap<Transform,Transform> m = (ConcurrentHashMap<Transform,Transform>) c;
k = m.get(key);
} else if (c == null) {
return null;
} else if (c instanceof Transform t) {
// one-element cache avoids overhead of an array
if (t.equals(key)) k = t;
} else {
Transform[] ta = (Transform[])c;
for (int i = 0; i < ta.length; i++) {
Transform t = ta[i];
if (t == null) break;
if (t.equals(key)) { k = t; break; }
}
}
assert(k == null || key.equals(k));
return (k != null) ? k.get() : null;
}
/** Arbitrary but reasonable limits on Transform[] size for cache. */
private static final int MIN_CACHE_ARRAY_SIZE = 4, MAX_CACHE_ARRAY_SIZE = 16;
/** Cache a transform with its result, and return that result.
* But if an equivalent transform has already been cached, return its result instead.
*/
private LambdaForm putInCache(TransformKey key, LambdaForm form) {
Transform transform = key.withResult(form);
for (int pass = 0; ; pass++) {
Object c = lambdaForm.transformCache;
if (c instanceof ConcurrentHashMap) {
@SuppressWarnings("unchecked")
ConcurrentHashMap<Transform,Transform> m = (ConcurrentHashMap<Transform,Transform>) c;
Transform k = m.putIfAbsent(transform, transform);
if (k == null) return form;
LambdaForm result = k.get();
if (result != null) {
return result;
} else {
if (m.replace(transform, k, transform)) {
return form;
} else {
continue;
}
}
}
assert(pass == 0);
synchronized (lambdaForm) {
c = lambdaForm.transformCache;
if (c instanceof ConcurrentHashMap)
continue;
if (c == null) {
lambdaForm.transformCache = transform;
return form;
}
Transform[] ta;
if (c instanceof Transform k) {
if (k.equals(key)) {
LambdaForm result = k.get();
if (result == null) {
lambdaForm.transformCache = transform;
return form;
} else {
return result;
}
} else if (k.get() == null) { // overwrite stale entry
lambdaForm.transformCache = transform;
return form;
}
// expand one-element cache to small array
ta = new Transform[MIN_CACHE_ARRAY_SIZE];
ta[0] = k;
lambdaForm.transformCache = ta;
} else {
// it is already expanded
ta = (Transform[])c;
}
int len = ta.length;
int stale = -1;
int i;
for (i = 0; i < len; i++) {
Transform k = ta[i];
if (k == null) {
break;
}
if (k.equals(transform)) {
LambdaForm result = k.get();
if (result == null) {
ta[i] = transform;
return form;
} else {
return result;
}
} else if (stale < 0 && k.get() == null) {
stale = i; // remember 1st stale entry index
}
}
if (i < len || stale >= 0) {
// just fall through to cache update
} else if (len < MAX_CACHE_ARRAY_SIZE) {
len = Math.min(len * 2, MAX_CACHE_ARRAY_SIZE);
ta = Arrays.copyOf(ta, len);
lambdaForm.transformCache = ta;
} else {
ConcurrentHashMap<Transform, Transform> m = new ConcurrentHashMap<>(MAX_CACHE_ARRAY_SIZE * 2);
for (Transform k : ta) {
m.put(k, k);
}
lambdaForm.transformCache = m;
// The second iteration will update for this query, concurrently.
continue;
}
int idx = (stale >= 0) ? stale : i;
ta[idx] = transform;
return form;
}
}
}
private LambdaFormBuffer buffer() {
return new LambdaFormBuffer(lambdaForm);
}
/// Editing methods for method handles. These need to have fast paths.
private BoundMethodHandle.SpeciesData oldSpeciesData() {
return BoundMethodHandle.speciesDataFor(lambdaForm);
}
private BoundMethodHandle.SpeciesData newSpeciesData(BasicType type) {
return oldSpeciesData().extendWith((byte) type.ordinal());
}
BoundMethodHandle bindArgumentL(BoundMethodHandle mh, int pos, Object value) {
assert(mh.speciesData() == oldSpeciesData());
BasicType bt = L_TYPE;
MethodType type2 = bindArgumentType(mh, pos, bt);
LambdaForm form2 = bindArgumentForm(1+pos);
return mh.copyWithExtendL(type2, form2, value);
}
BoundMethodHandle bindArgumentI(BoundMethodHandle mh, int pos, int value) {
assert(mh.speciesData() == oldSpeciesData());
BasicType bt = I_TYPE;
MethodType type2 = bindArgumentType(mh, pos, bt);
LambdaForm form2 = bindArgumentForm(1+pos);
return mh.copyWithExtendI(type2, form2, value);
}
BoundMethodHandle bindArgumentJ(BoundMethodHandle mh, int pos, long value) {
assert(mh.speciesData() == oldSpeciesData());
BasicType bt = J_TYPE;
MethodType type2 = bindArgumentType(mh, pos, bt);
LambdaForm form2 = bindArgumentForm(1+pos);
return mh.copyWithExtendJ(type2, form2, value);
}
BoundMethodHandle bindArgumentF(BoundMethodHandle mh, int pos, float value) {
assert(mh.speciesData() == oldSpeciesData());
BasicType bt = F_TYPE;
MethodType type2 = bindArgumentType(mh, pos, bt);
LambdaForm form2 = bindArgumentForm(1+pos);
return mh.copyWithExtendF(type2, form2, value);
}
BoundMethodHandle bindArgumentD(BoundMethodHandle mh, int pos, double value) {
assert(mh.speciesData() == oldSpeciesData());
BasicType bt = D_TYPE;
MethodType type2 = bindArgumentType(mh, pos, bt);
LambdaForm form2 = bindArgumentForm(1+pos);
return mh.copyWithExtendD(type2, form2, value);
}
private MethodType bindArgumentType(BoundMethodHandle mh, int pos, BasicType bt) {
assert(mh.form.uncustomize() == lambdaForm);
assert(mh.form.names[1+pos].type == bt);
assert(BasicType.basicType(mh.type().parameterType(pos)) == bt);
return mh.type().dropParameterTypes(pos, pos+1);
}
/// Editing methods for lambda forms.
// Each editing method can (potentially) cache the edited LF so that it can be reused later.
LambdaForm bindArgumentForm(int pos) {
TransformKey key = TransformKey.of(BIND_ARG, pos);
LambdaForm form = getInCache(key);
if (form != null) {
assert(form.parameterConstraint(0) == newSpeciesData(lambdaForm.parameterType(pos)));
return form;
}
LambdaFormBuffer buf = buffer();
buf.startEdit();
BoundMethodHandle.SpeciesData oldData = oldSpeciesData();
BoundMethodHandle.SpeciesData newData = newSpeciesData(lambdaForm.parameterType(pos));
Name oldBaseAddress = lambdaForm.parameter(0); // BMH holding the values
Name newBaseAddress;
NamedFunction getter = newData.getterFunction(oldData.fieldCount());
if (pos != 0) {
// The newly created LF will run with a different BMH.
// Switch over any pre-existing BMH field references to the new BMH class.
buf.replaceFunctions(oldData.getterFunctions(), newData.getterFunctions(), oldBaseAddress);
newBaseAddress = oldBaseAddress.withConstraint(newData);
buf.renameParameter(0, newBaseAddress);
buf.replaceParameterByNewExpression(pos, new Name(getter, newBaseAddress));
} else {
// cannot bind the MH arg itself, unless oldData is empty
assert(oldData == BoundMethodHandle.SPECIALIZER.topSpecies());
newBaseAddress = new Name(L_TYPE).withConstraint(newData);
buf.replaceParameterByNewExpression(0, new Name(getter, newBaseAddress));
buf.insertParameter(0, newBaseAddress);
}
form = buf.endEdit();
return putInCache(key, form);
}
LambdaForm addArgumentForm(int pos, BasicType type) {
TransformKey key = TransformKey.of(ADD_ARG, pos, type.ordinal());
LambdaForm form = getInCache(key);
if (form != null) {
assert(form.arity == lambdaForm.arity+1);
assert(form.parameterType(pos) == type);
return form;
}
LambdaFormBuffer buf = buffer();
buf.startEdit();
buf.insertParameter(pos, new Name(type));
form = buf.endEdit();
return putInCache(key, form);
}
LambdaForm dupArgumentForm(int srcPos, int dstPos) {
TransformKey key = TransformKey.of(DUP_ARG, srcPos, dstPos);
LambdaForm form = getInCache(key);
if (form != null) {
assert(form.arity == lambdaForm.arity-1);
return form;
}
LambdaFormBuffer buf = buffer();
buf.startEdit();
assert(lambdaForm.parameter(srcPos).constraint == null);
assert(lambdaForm.parameter(dstPos).constraint == null);
buf.replaceParameterByCopy(dstPos, srcPos);
form = buf.endEdit();
return putInCache(key, form);
}
LambdaForm spreadArgumentsForm(int pos, Class<?> arrayType, int arrayLength) {
Class<?> elementType = arrayType.getComponentType();
Class<?> erasedArrayType = arrayType;
if (!elementType.isPrimitive())
erasedArrayType = Object[].class;
BasicType bt = basicType(elementType);
int elementTypeKey = bt.ordinal();
if (bt.basicTypeClass() != elementType) {
if (elementType.isPrimitive()) {
elementTypeKey = TYPE_LIMIT + Wrapper.forPrimitiveType(elementType).ordinal();
}
}
TransformKey key = TransformKey.of(SPREAD_ARGS, pos, elementTypeKey, arrayLength);
LambdaForm form = getInCache(key);
if (form != null) {
assert(form.arity == lambdaForm.arity - arrayLength + 1);
return form;
}
LambdaFormBuffer buf = buffer();
buf.startEdit();
assert(pos <= MethodType.MAX_JVM_ARITY);
assert(pos + arrayLength <= lambdaForm.arity);
assert(pos > 0); // cannot spread the MH arg itself
Name spreadParam = new Name(L_TYPE);
Name checkSpread = new Name(MethodHandleImpl.getFunction(MethodHandleImpl.NF_checkSpreadArgument),
spreadParam, arrayLength);
// insert the new expressions
int exprPos = lambdaForm.arity();
buf.insertExpression(exprPos++, checkSpread);
// adjust the arguments
MethodHandle aload = MethodHandles.arrayElementGetter(erasedArrayType);
for (int i = 0; i < arrayLength; i++) {
Name loadArgument = new Name(new NamedFunction(makeIntrinsic(aload, Intrinsic.ARRAY_LOAD)), spreadParam, i);
buf.insertExpression(exprPos + i, loadArgument);
buf.replaceParameterByCopy(pos + i, exprPos + i);
}
buf.insertParameter(pos, spreadParam);
form = buf.endEdit();
return putInCache(key, form);
}
LambdaForm collectArgumentsForm(int pos, MethodType collectorType) {
int collectorArity = collectorType.parameterCount();
boolean dropResult = (collectorType.returnType() == void.class);
if (collectorArity == 1 && !dropResult) {
return filterArgumentForm(pos, basicType(collectorType.parameterType(0)));
}
byte[] newTypes = BasicType.basicTypesOrd(collectorType.ptypes());
byte kind = (dropResult ? COLLECT_ARGS_TO_VOID : COLLECT_ARGS);
if (dropResult && collectorArity == 0) pos = 1; // pure side effect
TransformKey key = TransformKey.of(kind, pos, collectorArity, newTypes);
LambdaForm form = getInCache(key);
if (form != null) {
assert(form.arity == lambdaForm.arity - (dropResult ? 0 : 1) + collectorArity);
return form;
}
form = makeArgumentCombinationForm(pos, collectorType, false, dropResult);
return putInCache(key, form);
}
LambdaForm filterArgumentForm(int pos, BasicType newType) {
TransformKey key = TransformKey.of(FILTER_ARG, pos, newType.ordinal());
LambdaForm form = getInCache(key);
if (form != null) {
assert(form.arity == lambdaForm.arity);
assert(form.parameterType(pos) == newType);
return form;
}
BasicType oldType = lambdaForm.parameterType(pos);
MethodType filterType = MethodType.methodType(oldType.basicTypeClass(),
newType.basicTypeClass());
form = makeArgumentCombinationForm(pos, filterType, false, false);
return putInCache(key, form);
}
/**
* This creates a LF that will repeatedly invoke some unary filter function
* at each of the given positions. This allows fewer LFs and BMH species
* classes to be generated in typical cases compared to building up the form
* by reapplying of {@code filterArgumentForm(int,BasicType)}, and should do
* no worse in the worst case.
*/
LambdaForm filterRepeatedArgumentForm(BasicType newType, int... argPositions) {
assert (argPositions.length > 1);
TransformKey key = TransformKey.of(REPEAT_FILTER_ARGS, newType.ordinal(), argPositions);
LambdaForm form = getInCache(key);
if (form != null) {
assert(form.arity == lambdaForm.arity &&
formParametersMatch(form, newType, argPositions));
return form;
}
BasicType oldType = lambdaForm.parameterType(argPositions[0]);
MethodType filterType = MethodType.methodType(oldType.basicTypeClass(),
newType.basicTypeClass());
form = makeRepeatedFilterForm(filterType, argPositions);
assert (formParametersMatch(form, newType, argPositions));
return putInCache(key, form);
}
private boolean formParametersMatch(LambdaForm form, BasicType newType, int... argPositions) {
for (int i : argPositions) {
if (form.parameterType(i) != newType) {
return false;
}
}
return true;
}
private LambdaForm makeRepeatedFilterForm(MethodType combinerType, int... positions) {
assert (combinerType.parameterCount() == 1 &&
combinerType == combinerType.basicType() &&
combinerType.returnType() != void.class);
LambdaFormBuffer buf = buffer();
buf.startEdit();
BoundMethodHandle.SpeciesData oldData = oldSpeciesData();
BoundMethodHandle.SpeciesData newData = newSpeciesData(L_TYPE);
// The newly created LF will run with a different BMH.
// Switch over any pre-existing BMH field references to the new BMH class.
Name oldBaseAddress = lambdaForm.parameter(0); // BMH holding the values
buf.replaceFunctions(oldData.getterFunctions(), newData.getterFunctions(), oldBaseAddress);
Name newBaseAddress = oldBaseAddress.withConstraint(newData);
buf.renameParameter(0, newBaseAddress);
// Insert the new expressions at the end
int exprPos = lambdaForm.arity();
Name getCombiner = new Name(newData.getterFunction(oldData.fieldCount()), newBaseAddress);
buf.insertExpression(exprPos++, getCombiner);
// After inserting expressions, we insert parameters in order
// from lowest to highest, simplifying the calculation of where parameters
// and expressions are
var newParameters = new TreeMap<Name, Integer>(new Comparator<>() {
public int compare(Name n1, Name n2) {
return n1.index - n2.index;
}
});
// Insert combiner expressions in reverse order so that the invocation of
// the resulting form will invoke the combiners in left-to-right order
for (int i = positions.length - 1; i >= 0; --i) {
int pos = positions[i];
assert (pos > 0 && pos <= MethodType.MAX_JVM_ARITY && pos < lambdaForm.arity);
Name newParameter = new Name(pos, basicType(combinerType.parameterType(0)));
Object[] combinerArgs = {getCombiner, newParameter};
Name callCombiner = new Name(combinerType, combinerArgs);
buf.insertExpression(exprPos++, callCombiner);
newParameters.put(newParameter, exprPos);
}
// Mix in new parameters from left to right in the buffer (this doesn't change
// execution order
int offset = 0;
for (var entry : newParameters.entrySet()) {
Name newParameter = entry.getKey();
int from = entry.getValue();
buf.insertParameter(newParameter.index() + 1 + offset, newParameter);
buf.replaceParameterByCopy(newParameter.index() + offset, from + offset);
offset++;
}
return buf.endEdit();
}
private LambdaForm makeArgumentCombinationForm(int pos,
MethodType combinerType,
boolean keepArguments, boolean dropResult) {
LambdaFormBuffer buf = buffer();
buf.startEdit();
int combinerArity = combinerType.parameterCount();
int resultArity = (dropResult ? 0 : 1);
assert(pos <= MethodType.MAX_JVM_ARITY);
assert(pos + resultArity + (keepArguments ? combinerArity : 0) <= lambdaForm.arity);
assert(pos > 0); // cannot filter the MH arg itself
assert(combinerType == combinerType.basicType());
assert(combinerType.returnType() != void.class || dropResult);
BoundMethodHandle.SpeciesData oldData = oldSpeciesData();
BoundMethodHandle.SpeciesData newData = newSpeciesData(L_TYPE);
// The newly created LF will run with a different BMH.
// Switch over any pre-existing BMH field references to the new BMH class.
Name oldBaseAddress = lambdaForm.parameter(0); // BMH holding the values
buf.replaceFunctions(oldData.getterFunctions(), newData.getterFunctions(), oldBaseAddress);
Name newBaseAddress = oldBaseAddress.withConstraint(newData);
buf.renameParameter(0, newBaseAddress);
Name getCombiner = new Name(newData.getterFunction(oldData.fieldCount()), newBaseAddress);
Object[] combinerArgs = new Object[1 + combinerArity];
combinerArgs[0] = getCombiner;
Name[] newParams;
if (keepArguments) {
newParams = new Name[0];
System.arraycopy(lambdaForm.names, pos + resultArity,
combinerArgs, 1, combinerArity);
} else {
newParams = new Name[combinerArity];
for (int i = 0; i < newParams.length; i++) {
newParams[i] = new Name(pos + i, basicType(combinerType.parameterType(i)));
}
System.arraycopy(newParams, 0,
combinerArgs, 1, combinerArity);
}
Name callCombiner = new Name(combinerType, combinerArgs);
// insert the two new expressions
int exprPos = lambdaForm.arity();
buf.insertExpression(exprPos+0, getCombiner);
buf.insertExpression(exprPos+1, callCombiner);
// insert new arguments, if needed
int argPos = pos + resultArity; // skip result parameter
for (Name newParam : newParams) {
buf.insertParameter(argPos++, newParam);
}
assert(buf.lastIndexOf(callCombiner) == exprPos+1+newParams.length);
if (!dropResult) {
buf.replaceParameterByCopy(pos, exprPos+1+newParams.length);
}
return buf.endEdit();
}
private LambdaForm makeArgumentCombinationForm(int pos,
MethodType combinerType,
int[] argPositions,
boolean keepArguments,
boolean dropResult) {
LambdaFormBuffer buf = buffer();
buf.startEdit();
int combinerArity = combinerType.parameterCount();
assert(combinerArity == argPositions.length);
int resultArity = (dropResult ? 0 : 1);
assert(pos <= lambdaForm.arity);
assert(pos > 0); // cannot filter the MH arg itself
assert(combinerType == combinerType.basicType());
assert(combinerType.returnType() != void.class || dropResult);
BoundMethodHandle.SpeciesData oldData = oldSpeciesData();
BoundMethodHandle.SpeciesData newData = newSpeciesData(L_TYPE);
// The newly created LF will run with a different BMH.
// Switch over any pre-existing BMH field references to the new BMH class.
Name oldBaseAddress = lambdaForm.parameter(0); // BMH holding the values
buf.replaceFunctions(oldData.getterFunctions(), newData.getterFunctions(), oldBaseAddress);
Name newBaseAddress = oldBaseAddress.withConstraint(newData);
buf.renameParameter(0, newBaseAddress);
Name getCombiner = new Name(newData.getterFunction(oldData.fieldCount()), newBaseAddress);
Object[] combinerArgs = new Object[1 + combinerArity];
combinerArgs[0] = getCombiner;
Name newParam = null;
if (keepArguments) {
for (int i = 0; i < combinerArity; i++) {
combinerArgs[i + 1] = lambdaForm.parameter(1 + argPositions[i]);
assert (basicType(combinerType.parameterType(i)) == lambdaForm.parameterType(1 + argPositions[i]));
}
} else {
newParam = new Name(pos, BasicType.basicType(combinerType.returnType()));
for (int i = 0; i < combinerArity; i++) {
int argPos = 1 + argPositions[i];
if (argPos == pos) {
combinerArgs[i + 1] = newParam;
} else {
combinerArgs[i + 1] = lambdaForm.parameter(argPos);
}
assert (basicType(combinerType.parameterType(i)) == lambdaForm.parameterType(1 + argPositions[i]));
}
}
Name callCombiner = new Name(combinerType, combinerArgs);
// insert the two new expressions
int exprPos = lambdaForm.arity();
buf.insertExpression(exprPos+0, getCombiner);
buf.insertExpression(exprPos+1, callCombiner);
// insert new arguments, if needed
int argPos = pos + resultArity; // skip result parameter
if (newParam != null) {
buf.insertParameter(argPos++, newParam);
exprPos++;
}
assert(buf.lastIndexOf(callCombiner) == exprPos+1);
if (!dropResult) {
buf.replaceParameterByCopy(pos, exprPos+1);
}
return buf.endEdit();
}
LambdaForm filterReturnForm(BasicType newType, boolean constantZero) {
byte kind = (constantZero ? FILTER_RETURN_TO_ZERO : FILTER_RETURN);
TransformKey key = TransformKey.of(kind, newType.ordinal());
LambdaForm form = getInCache(key);
if (form != null) {
assert(form.arity == lambdaForm.arity);
assert(form.returnType() == newType);
return form;
}
LambdaFormBuffer buf = buffer();
buf.startEdit();
int insPos = lambdaForm.names.length;
Name callFilter;
if (constantZero) {
// Synthesize a constant zero value for the given type.
if (newType == V_TYPE)
callFilter = null;
else
callFilter = new Name(constantZero(newType));
} else {
BoundMethodHandle.SpeciesData oldData = oldSpeciesData();
BoundMethodHandle.SpeciesData newData = newSpeciesData(L_TYPE);
// The newly created LF will run with a different BMH.
// Switch over any pre-existing BMH field references to the new BMH class.
Name oldBaseAddress = lambdaForm.parameter(0); // BMH holding the values
buf.replaceFunctions(oldData.getterFunctions(), newData.getterFunctions(), oldBaseAddress);
Name newBaseAddress = oldBaseAddress.withConstraint(newData);
buf.renameParameter(0, newBaseAddress);
Name getFilter = new Name(newData.getterFunction(oldData.fieldCount()), newBaseAddress);
buf.insertExpression(insPos++, getFilter);
BasicType oldType = lambdaForm.returnType();
if (oldType == V_TYPE) {
MethodType filterType = MethodType.methodType(newType.basicTypeClass());
callFilter = new Name(filterType, getFilter);
} else {
MethodType filterType = MethodType.methodType(newType.basicTypeClass(), oldType.basicTypeClass());
callFilter = new Name(filterType, getFilter, lambdaForm.names[lambdaForm.result]);
}
}
if (callFilter != null)
buf.insertExpression(insPos++, callFilter);
buf.setResult(callFilter);
form = buf.endEdit();
return putInCache(key, form);
}
LambdaForm collectReturnValueForm(MethodType combinerType) {
LambdaFormBuffer buf = buffer();
buf.startEdit();
int combinerArity = combinerType.parameterCount();
int argPos = lambdaForm.arity();
int exprPos = lambdaForm.names.length;
BoundMethodHandle.SpeciesData oldData = oldSpeciesData();
BoundMethodHandle.SpeciesData newData = newSpeciesData(L_TYPE);
// The newly created LF will run with a different BMH.
// Switch over any pre-existing BMH field references to the new BMH class.
Name oldBaseAddress = lambdaForm.parameter(0); // BMH holding the values
buf.replaceFunctions(oldData.getterFunctions(), newData.getterFunctions(), oldBaseAddress);
Name newBaseAddress = oldBaseAddress.withConstraint(newData);
buf.renameParameter(0, newBaseAddress);
// Now we set up the call to the filter
Name getCombiner = new Name(newData.getterFunction(oldData.fieldCount()), newBaseAddress);
Object[] combinerArgs = new Object[combinerArity + 1];
combinerArgs[0] = getCombiner; // first (synthetic) argument should be the MH that acts as a target of the invoke
// set up additional adapter parameters (in case the combiner is not a unary function)
Name[] newParams = new Name[combinerArity - 1]; // last combiner parameter is the return adapter
for (int i = 0; i < newParams.length; i++) {
newParams[i] = new Name(argPos + i, basicType(combinerType.parameterType(i)));
}
// set up remaining filter parameters to point to the corresponding adapter parameters (see above)
System.arraycopy(newParams, 0,
combinerArgs, 1, combinerArity - 1);
// the last filter argument is set to point at the result of the target method handle
combinerArgs[combinerArity] = buf.name(lambdaForm.names.length - 1);
Name callCombiner = new Name(combinerType, combinerArgs);
// insert the two new expressions
buf.insertExpression(exprPos, getCombiner);
buf.insertExpression(exprPos + 1, callCombiner);
// insert additional arguments
int insPos = argPos;
for (Name newParam : newParams) {
buf.insertParameter(insPos++, newParam);
}
buf.setResult(callCombiner);
return buf.endEdit();
}
LambdaForm foldArgumentsForm(int foldPos, boolean dropResult, MethodType combinerType) {
int combinerArity = combinerType.parameterCount();
byte kind = (dropResult ? FOLD_ARGS_TO_VOID : FOLD_ARGS);
TransformKey key = TransformKey.of(kind, foldPos, combinerArity);
LambdaForm form = getInCache(key);
if (form != null) {
assert(form.arity == lambdaForm.arity - (kind == FOLD_ARGS ? 1 : 0));
return form;
}
form = makeArgumentCombinationForm(foldPos, combinerType, true, dropResult);
return putInCache(key, form);
}
LambdaForm foldArgumentsForm(int foldPos, boolean dropResult, MethodType combinerType, int ... argPositions) {
byte kind = (dropResult ? FOLD_SELECT_ARGS_TO_VOID : FOLD_SELECT_ARGS);
TransformKey key = TransformKey.of(kind, foldPos, argPositions);
LambdaForm form = getInCache(key);
if (form != null) {
assert(form.arity == lambdaForm.arity - (kind == FOLD_SELECT_ARGS ? 1 : 0));
return form;
}
form = makeArgumentCombinationForm(foldPos, combinerType, argPositions, true, dropResult);
return putInCache(key, form);
}
LambdaForm filterArgumentsForm(int filterPos, MethodType combinerType, int ... argPositions) {
TransformKey key = TransformKey.of(FILTER_SELECT_ARGS, filterPos, argPositions);
LambdaForm form = getInCache(key);
if (form != null) {
assert(form.arity == lambdaForm.arity);
return form;
}
form = makeArgumentCombinationForm(filterPos, combinerType, argPositions, false, false);
return putInCache(key, form);
}
LambdaForm permuteArgumentsForm(int skip, int[] reorder) {
assert(skip == 1); // skip only the leading MH argument, names[0]
int length = lambdaForm.names.length;
int outArgs = reorder.length;
int inTypes = 0;
boolean nullPerm = true;
for (int i = 0; i < reorder.length; i++) {
int inArg = reorder[i];
if (inArg != i) nullPerm = false;
inTypes = Math.max(inTypes, inArg+1);
}
assert(skip + reorder.length == lambdaForm.arity);
if (nullPerm) return lambdaForm; // do not bother to cache
TransformKey key = TransformKey.of(PERMUTE_ARGS, reorder);
LambdaForm form = getInCache(key);
if (form != null) {
assert(form.arity == skip+inTypes) : form;
return form;
}
BasicType[] types = new BasicType[inTypes];
for (int i = 0; i < outArgs; i++) {
int inArg = reorder[i];
types[inArg] = lambdaForm.names[skip + i].type;
}
assert (skip + outArgs == lambdaForm.arity);
assert (permutedTypesMatch(reorder, types, lambdaForm.names, skip));
int pos = 0;
while (pos < outArgs && reorder[pos] == pos) {
pos += 1;
}
Name[] names2 = new Name[length - outArgs + inTypes];
System.arraycopy(lambdaForm.names, 0, names2, 0, skip + pos);
int bodyLength = length - lambdaForm.arity;
System.arraycopy(lambdaForm.names, skip + outArgs, names2, skip + inTypes, bodyLength);
int arity2 = names2.length - bodyLength;
int result2 = lambdaForm.result;
if (result2 >= skip) {
if (result2 < skip + outArgs) {
result2 = reorder[result2 - skip] + skip;
} else {
result2 = result2 - outArgs + inTypes;
}
}
for (int j = pos; j < outArgs; j++) {
Name n = lambdaForm.names[skip + j];
int i = reorder[j];
Name n2 = names2[skip + i];
if (n2 == null) {
names2[skip + i] = n2 = new Name(types[i]);
} else {
assert (n2.type == types[i]);
}
for (int k = arity2; k < names2.length; k++) {
names2[k] = names2[k].replaceName(n, n2);
}
}
for (int i = skip + pos; i < arity2; i++) {
if (names2[i] == null) {
names2[i] = argument(i, types[i - skip]);
}
}
for (int j = lambdaForm.arity; j < lambdaForm.names.length; j++) {
int i = j - lambdaForm.arity + arity2;
Name n = lambdaForm.names[j];
Name n2 = names2[i];
if (n != n2) {
for (int k = i + 1; k < names2.length; k++) {
names2[k] = names2[k].replaceName(n, n2);
}
}
}
form = new LambdaForm(arity2, names2, result2);
return putInCache(key, form);
}
LambdaForm noteLoopLocalTypesForm(int pos, BasicType[] localTypes) {
assert(lambdaForm.isLoop(pos));
int[] desc = BasicType.basicTypeOrds(localTypes);
desc = Arrays.copyOf(desc, desc.length + 1);
desc[desc.length - 1] = pos;
TransformKey key = TransformKey.of(LOCAL_TYPES, desc);
LambdaForm form = getInCache(key);
if (form != null) {
return form;
}
// replace the null entry in the MHImpl.loop invocation with localTypes
Name invokeLoop = lambdaForm.names[pos + 1];
assert(invokeLoop.function.equals(MethodHandleImpl.getFunction(NF_loop)));
Object[] args = Arrays.copyOf(invokeLoop.arguments, invokeLoop.arguments.length);
assert(args[0] == null);
args[0] = localTypes;
LambdaFormBuffer buf = buffer();
buf.startEdit();
buf.changeName(pos + 1, new Name(MethodHandleImpl.getFunction(NF_loop), args));
form = buf.endEdit();
return putInCache(key, form);
}
static boolean permutedTypesMatch(int[] reorder, BasicType[] types, Name[] names, int skip) {
for (int i = 0; i < reorder.length; i++) {
assert (names[skip + i].isParam());
assert (names[skip + i].type == types[reorder[i]]);
}
return true;
}
}
⏎ java/lang/invoke/LambdaFormEditor.java
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