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8046685: Uncompilable large expressions involving generics
Improve inference propagation logic so that unnecessary inference variables are not propagated. Reviewed-by: vromero
This commit is contained in:
Maurizio Cimadamore
parent
d67f9dacf5
commit
90a76d40e5
3 changed files with 246 additions and 42 deletions
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@ -182,6 +182,7 @@ public class Infer {
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argtypes, mt.getParameterTypes(), warn);
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if (allowGraphInference && resultInfo != null && resultInfo.pt == anyPoly) {
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checkWithinBounds(inferenceContext, warn);
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//we are inside method attribution - just return a partially inferred type
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return new PartiallyInferredMethodType(mt, inferenceContext, env, warn);
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} else if (allowGraphInference &&
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@ -189,13 +190,21 @@ public class Infer {
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!warn.hasNonSilentLint(Lint.LintCategory.UNCHECKED)) {
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//inject return constraints earlier
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checkWithinBounds(inferenceContext, warn); //propagation
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boolean shouldPropagate = resultInfo.checkContext.inferenceContext().free(resultInfo.pt);
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InferenceContext minContext = shouldPropagate ?
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inferenceContext.min(roots(mt, deferredAttrContext), true, warn) :
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inferenceContext;
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Type newRestype = generateReturnConstraints(env.tree, resultInfo, //B3
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mt, inferenceContext);
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mt, minContext);
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mt = (MethodType)types.createMethodTypeWithReturn(mt, newRestype);
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//propagate outwards if needed
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if (resultInfo.checkContext.inferenceContext().free(resultInfo.pt)) {
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if (shouldPropagate) {
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//propagate inference context outwards and exit
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inferenceContext.dupTo(resultInfo.checkContext.inferenceContext());
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minContext.dupTo(resultInfo.checkContext.inferenceContext());
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deferredAttrContext.complete();
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return mt;
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}
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@ -242,6 +251,19 @@ public class Infer {
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dumpGraphsIfNeeded(env.tree, msym, resolveContext);
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}
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}
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//where
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private List<Type> roots(MethodType mt, DeferredAttrContext deferredAttrContext) {
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ListBuffer<Type> roots = new ListBuffer<>();
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roots.add(mt.getReturnType());
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if (deferredAttrContext != null && deferredAttrContext.mode == AttrMode.CHECK) {
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roots.addAll(mt.getThrownTypes());
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for (DeferredAttr.DeferredAttrNode n : deferredAttrContext.deferredAttrNodes) {
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roots.addAll(n.deferredStuckPolicy.stuckVars());
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roots.addAll(n.deferredStuckPolicy.depVars());
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}
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}
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return roots.toList();
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}
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/**
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* A partially infered method/constructor type; such a type can be checked multiple times
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@ -284,16 +306,21 @@ public class Infer {
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*/
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saved_undet = inferenceContext.save();
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if (allowGraphInference && !warn.hasNonSilentLint(Lint.LintCategory.UNCHECKED)) {
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//inject return constraints earlier
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checkWithinBounds(inferenceContext, noWarnings); //propagation
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Type res = generateReturnConstraints(env.tree, resultInfo, //B3
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this, inferenceContext);
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boolean shouldPropagate = resultInfo.checkContext.inferenceContext().free(resultInfo.pt);
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if (resultInfo.checkContext.inferenceContext().free(resultInfo.pt)) {
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InferenceContext minContext = shouldPropagate ?
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inferenceContext.min(roots(asMethodType(), null), false, warn) :
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inferenceContext;
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MethodType other = (MethodType)minContext.update(asMethodType());
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Type newRestype = generateReturnConstraints(env.tree, resultInfo, //B3
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other, minContext);
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if (shouldPropagate) {
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//propagate inference context outwards and exit
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inferenceContext.dupTo(resultInfo.checkContext.inferenceContext(),
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minContext.dupTo(resultInfo.checkContext.inferenceContext(),
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resultInfo.checkContext.deferredAttrContext().insideOverloadPhase());
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return res;
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return newRestype;
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}
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}
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inferenceContext.solve(noWarnings);
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@ -589,6 +616,18 @@ public class Infer {
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}
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}
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TypeMapping<Void> fromTypeVarFun = new TypeMapping<Void>() {
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@Override
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public Type visitTypeVar(TypeVar tv, Void aVoid) {
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return new UndetVar(tv, types);
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}
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@Override
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public Type visitCapturedType(CapturedType t, Void aVoid) {
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return new CapturedUndetVar(t, types);
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}
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};
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/**
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* This method is used to infer a suitable target SAM in case the original
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* SAM type contains one or more wildcards. An inference process is applied
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@ -25,39 +25,35 @@
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package com.sun.tools.javac.comp;
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import java.util.Collections;
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import java.util.EnumSet;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Map;
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import java.util.Set;
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import com.sun.tools.javac.code.Symtab;
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import com.sun.tools.javac.code.Type;
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import com.sun.tools.javac.code.Type.CapturedType;
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import com.sun.tools.javac.code.Type.CapturedUndetVar;
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import com.sun.tools.javac.code.Type.TypeMapping;
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import com.sun.tools.javac.code.Type.ArrayType;
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import com.sun.tools.javac.code.Type.ClassType;
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import com.sun.tools.javac.code.Type.TypeVar;
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import com.sun.tools.javac.code.Type.UndetVar;
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import com.sun.tools.javac.code.Type.UndetVar.InferenceBound;
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import com.sun.tools.javac.code.Type.WildcardType;
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import com.sun.tools.javac.code.Types;
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import com.sun.tools.javac.comp.Infer.BestLeafSolver;
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import com.sun.tools.javac.comp.Infer.FreeTypeListener;
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import com.sun.tools.javac.comp.Infer.GraphSolver;
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import com.sun.tools.javac.comp.Infer.GraphStrategy;
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import com.sun.tools.javac.comp.Infer.InferenceException;
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import com.sun.tools.javac.comp.Infer.InferenceStep;
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import com.sun.tools.javac.comp.Infer.LeafSolver;
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import com.sun.tools.javac.tree.JCTree;
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import com.sun.tools.javac.tree.TreeMaker;
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import com.sun.tools.javac.util.Assert;
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import com.sun.tools.javac.util.Context;
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import com.sun.tools.javac.util.Filter;
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import com.sun.tools.javac.util.JCDiagnostic;
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import com.sun.tools.javac.util.JCDiagnostic.Factory;
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import com.sun.tools.javac.util.List;
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import com.sun.tools.javac.util.ListBuffer;
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import com.sun.tools.javac.util.Log;
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import com.sun.tools.javac.util.Warner;
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import static com.sun.tools.javac.code.TypeTag.UNDETVAR;
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/**
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* An inference context keeps track of the set of variables that are free
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* in the current context. It provides utility methods for opening/closing
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@ -76,43 +72,34 @@ class InferenceContext {
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/** list of inference vars as undet vars */
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List<Type> undetvars;
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Type update(Type t) {
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return t;
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}
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/** list of inference vars in this context */
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List<Type> inferencevars;
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Map<FreeTypeListener, List<Type>> freeTypeListeners = new HashMap<>();
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List<FreeTypeListener> freetypeListeners = List.nil();
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Types types;
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Infer infer;
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public InferenceContext(Infer infer, List<Type> inferencevars) {
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this.inferencevars = inferencevars;
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this.infer = infer;
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this.types = infer.types;
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fromTypeVarFun = new TypeMapping<Void>() {
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@Override
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public Type visitTypeVar(TypeVar tv, Void aVoid) {
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return new UndetVar(tv, types);
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}
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@Override
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public Type visitCapturedType(CapturedType t, Void aVoid) {
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return new CapturedUndetVar(t, types);
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}
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};
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this.undetvars = inferencevars.map(fromTypeVarFun);
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this(infer, inferencevars, inferencevars.map(infer.fromTypeVarFun));
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}
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TypeMapping<Void> fromTypeVarFun;
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public InferenceContext(Infer infer, List<Type> inferencevars, List<Type> undetvars) {
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this.inferencevars = inferencevars;
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this.undetvars = undetvars;
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this.infer = infer;
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this.types = infer.types;
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}
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/**
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* add a new inference var to this inference context
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*/
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void addVar(TypeVar t) {
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this.undetvars = this.undetvars.prepend(fromTypeVarFun.apply(t));
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this.undetvars = this.undetvars.prepend(infer.fromTypeVarFun.apply(t));
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this.inferencevars = this.inferencevars.prepend(t);
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}
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@ -366,6 +353,124 @@ class InferenceContext {
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}
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}
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InferenceContext min(List<Type> roots, boolean shouldSolve, Warner warn) {
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ReachabilityVisitor rv = new ReachabilityVisitor();
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rv.scan(roots);
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if (rv.min.size() == inferencevars.length()) {
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return this;
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}
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List<Type> minVars = List.from(rv.min);
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List<Type> redundantVars = inferencevars.diff(minVars);
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//compute new undet variables (bounds associated to redundant variables are dropped)
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ListBuffer<Type> minUndetVars = new ListBuffer<>();
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for (Type minVar : minVars) {
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UndetVar uv = (UndetVar)asUndetVar(minVar);
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UndetVar uv2 = new UndetVar((TypeVar)minVar, types);
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for (InferenceBound ib : InferenceBound.values()) {
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List<Type> newBounds = uv.getBounds(ib).stream()
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.filter(b -> !redundantVars.contains(b))
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.collect(List.collector());
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uv2.setBounds(ib, newBounds);
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}
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minUndetVars.add(uv2);
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}
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//compute new minimal inference context
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InferenceContext minContext = new InferenceContext(infer, minVars, minUndetVars.toList());
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for (Type t : minContext.inferencevars) {
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//add listener that forwards notifications to original context
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minContext.addFreeTypeListener(List.of(t), (inferenceContext) -> {
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List<Type> depVars = List.from(rv.minMap.get(t));
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solve(depVars, warn);
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notifyChange();
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});
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}
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if (shouldSolve) {
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//solve definitively unreachable variables
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List<Type> unreachableVars = redundantVars.diff(List.from(rv.equiv));
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solve(unreachableVars, warn);
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}
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return minContext;
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}
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class ReachabilityVisitor extends Types.UnaryVisitor<Void> {
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Set<Type> equiv = new HashSet<>();
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Set<Type> min = new HashSet<>();
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Map<Type, Set<Type>> minMap = new HashMap<>();
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void scan(List<Type> roots) {
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roots.stream().forEach(this::visit);
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}
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@Override
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public Void visitType(Type t, Void _unused) {
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return null;
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}
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@Override
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public Void visitUndetVar(UndetVar t, Void _unused) {
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if (min.add(t.qtype)) {
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Set<Type> deps = minMap.getOrDefault(t.qtype, new HashSet<>(Collections.singleton(t.qtype)));
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for (Type b : t.getBounds(InferenceBound.values())) {
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Type undet = asUndetVar(b);
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if (!undet.hasTag(UNDETVAR)) {
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visit(undet);
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} else if (isEquiv((UndetVar)undet, b)){
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deps.add(b);
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equiv.add(b);
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} else {
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visit(undet);
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}
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}
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minMap.put(t.qtype, deps);
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}
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return null;
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}
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@Override
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public Void visitWildcardType(WildcardType t, Void _unused) {
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return visit(t.type);
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}
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@Override
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public Void visitTypeVar(TypeVar t, Void aVoid) {
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Type undet = asUndetVar(t);
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if (undet.hasTag(UNDETVAR)) {
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visitUndetVar((UndetVar)undet, null);
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}
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return null;
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}
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@Override
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public Void visitArrayType(ArrayType t, Void _unused) {
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return visit(t.elemtype);
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}
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@Override
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public Void visitClassType(ClassType t, Void _unused) {
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visit(t.getEnclosingType());
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for (Type targ : t.getTypeArguments()) {
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visit(targ);
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}
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return null;
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}
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boolean isEquiv(UndetVar from, Type t) {
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UndetVar uv = (UndetVar)asUndetVar(t);
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for (InferenceBound ib : InferenceBound.values()) {
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List<Type> b1 = uv.getBounds(ib);
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List<Type> b2 = from.getBounds(ib);
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if (!b1.containsAll(b2) || !b2.containsAll(b1)) {
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return false;
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}
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}
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return true;
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}
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}
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private void solve(GraphStrategy ss, Warner warn) {
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solve(ss, new HashMap<Type, Set<Type>>(), warn);
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}
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60
langtools/test/tools/javac/lambda/speculative/T8046685.java
Normal file
60
langtools/test/tools/javac/lambda/speculative/T8046685.java
Normal file
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@ -0,0 +1,60 @@
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/*
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* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8046685
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* @summary Uncompilable large expressions involving generics.
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* @compile T8046685.java
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*/
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class T8046685 {
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interface Predicate<T, U> {
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public boolean apply(T t, U u);
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public boolean equals(Object o);
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}
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static <X1, X2> Predicate<X1, X2> and(final Predicate<? super X1, ? super X2> first, final Predicate<? super X1, ? super X2> second) {
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return null;
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}
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public static void test(Predicate<Integer, Integer> even) {
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and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even,
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and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even,
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and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even,
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and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even,
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and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even,
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and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even,
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and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even,
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and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even,
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and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even,
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and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even,
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and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even,
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and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even,
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and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, and(even, even)
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))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
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)))))))))))))))))))))))))))))))))));
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}
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}
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