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7133185: Update 292 overload resolution logic to match JLS

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Re-implement special overload resolution support for method handles according to the JLS SE 7 definition

Reviewed-by: jjg, dlsmith, jrose
This commit is contained in:
Maurizio Cimadamore 2012-03-26 15:28:49 +01:00
parent 9b1e54dae3
commit 51235439c2
10 changed files with 55 additions and 105 deletions
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16
langtools/src/share/classes/com/sun/tools/javac/code/Flags.java
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -221,7 +221,7 @@ public class Flags {
/** Flag that marks a hypothetical method that need not really be
* generated in the binary, but is present in the symbol table to
* simplify checking for erasure clashes.
* simplify checking for erasure clashes - also used for 292 poly sig methods.
*/
public static final long HYPOTHETICAL = 1L<<37;
@ -235,27 +235,21 @@ public class Flags {
*/
public static final long UNION = 1L<<39;
/**
* Flag that marks a signature-polymorphic invoke method.
* (These occur inside java.lang.invoke.MethodHandle.)
*/
public static final long POLYMORPHIC_SIGNATURE = 1L<<40;
/**
* Flag that marks a special kind of bridge methods (the ones that
* come from restricted supertype bounds)
*/
public static final long OVERRIDE_BRIDGE = 1L<<41;
public static final long OVERRIDE_BRIDGE = 1L<<40;
/**
* Flag that marks an 'effectively final' local variable
*/
public static final long EFFECTIVELY_FINAL = 1L<<42;
public static final long EFFECTIVELY_FINAL = 1L<<41;
/**
* Flag that marks non-override equivalent methods with the same signature
*/
public static final long CLASH = 1L<<43;
public static final long CLASH = 1L<<42;
/** Modifier masks.
*/

31
langtools/src/share/classes/com/sun/tools/javac/code/Symbol.java
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -202,16 +202,6 @@ public abstract class Symbol implements Element {
return (flags() & INTERFACE) != 0;
}
/** Recognize if this symbol was marked @PolymorphicSignature in the source. */
public boolean isPolymorphicSignatureGeneric() {
return (flags() & (POLYMORPHIC_SIGNATURE | HYPOTHETICAL)) == POLYMORPHIC_SIGNATURE;
}
/** Recognize if this symbol was split from a @PolymorphicSignature symbol in the source. */
public boolean isPolymorphicSignatureInstance() {
return (flags() & (POLYMORPHIC_SIGNATURE | HYPOTHETICAL)) == (POLYMORPHIC_SIGNATURE | HYPOTHETICAL);
}
/** Is this symbol declared (directly or indirectly) local
* to a method or variable initializer?
* Also includes fields of inner classes which are in
@ -1316,6 +1306,25 @@ public abstract class Symbol implements Element {
getKind() == ElementKind.INSTANCE_INIT;
}
/**
* A polymorphic signature method (JLS SE 7, 8.4.1) is a method that
* (i) is declared in the java.lang.invoke.MethodHandle class, (ii) takes
* a single variable arity parameter (iii) whose declared type is Object[],
* (iv) has a return type of Object and (v) is native.
*/
public boolean isSignaturePolymorphic(Types types) {
List<Type> argtypes = type.getParameterTypes();
Type firstElemType = argtypes.nonEmpty() ?
types.elemtype(argtypes.head) :
null;
return owner == types.syms.methodHandleType.tsym &&
argtypes.length() == 1 &&
firstElemType != null &&
types.isSameType(firstElemType, types.syms.objectType) &&
types.isSameType(type.getReturnType(), types.syms.objectType) &&
(flags() & NATIVE) != 0;
}
public Attribute getDefaultValue() {
return defaultValue;
}

3
langtools/src/share/classes/com/sun/tools/javac/code/Symtab.java
View file

@ -127,7 +127,6 @@ public class Symtab {
public final Type serializableType;
public final Type methodHandleType;
public final Type nativeHeaderType;
public final Type polymorphicSignatureType;
public final Type throwableType;
public final Type errorType;
public final Type interruptedExceptionType;
@ -436,7 +435,6 @@ public class Symtab {
throwableType = enterClass("java.lang.Throwable");
serializableType = enterClass("java.io.Serializable");
methodHandleType = enterClass("java.lang.invoke.MethodHandle");
polymorphicSignatureType = enterClass("java.lang.invoke.MethodHandle$PolymorphicSignature");
errorType = enterClass("java.lang.Error");
illegalArgumentExceptionType = enterClass("java.lang.IllegalArgumentException");
interruptedExceptionType = enterClass("java.lang.InterruptedException");
@ -483,7 +481,6 @@ public class Symtab {
synthesizeEmptyInterfaceIfMissing(autoCloseableType);
synthesizeEmptyInterfaceIfMissing(cloneableType);
synthesizeEmptyInterfaceIfMissing(serializableType);
synthesizeEmptyInterfaceIfMissing(polymorphicSignatureType);
synthesizeBoxTypeIfMissing(doubleType);
synthesizeBoxTypeIfMissing(floatType);
synthesizeBoxTypeIfMissing(voidType);

2
langtools/src/share/classes/com/sun/tools/javac/comp/Check.java
View file

@ -593,7 +593,7 @@ public class Check {
Symbol sym = TreeInfo.symbol(apply.meth);
is292targetTypeCast = sym != null &&
sym.kind == MTH &&
(sym.flags() & POLYMORPHIC_SIGNATURE) != 0;
(sym.flags() & HYPOTHETICAL) != 0;
}
return is292targetTypeCast;
}

3
langtools/src/share/classes/com/sun/tools/javac/comp/Infer.java
View file

@ -603,8 +603,7 @@ public class Infer {
* method signature. The target return type is computed from the immediately
* enclosing scope surrounding the polymorphic-signature call.
*/
Type instantiatePolymorphicSignatureInstance(Env<AttrContext> env, Type site,
Name name,
Type instantiatePolymorphicSignatureInstance(Env<AttrContext> env,
MethodSymbol spMethod, // sig. poly. method or null if none
List<Type> argtypes) {
final Type restype;

16
langtools/src/share/classes/com/sun/tools/javac/comp/MemberEnter.java
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -781,20 +781,6 @@ public class MemberEnter extends JCTree.Visitor implements Completer {
&& s.owner.kind != MTH
&& types.isSameType(c.type, syms.deprecatedType))
s.flags_field |= Flags.DEPRECATED;
// Internally to java.lang.invoke, a @PolymorphicSignature annotation
// acts like a classfile attribute.
if (!c.type.isErroneous() &&
types.isSameType(c.type, syms.polymorphicSignatureType)) {
if (!target.hasMethodHandles()) {
// Somebody is compiling JDK7 source code to a JDK6 target.
// Make it an error, since it is unlikely but important.
log.error(env.tree.pos(),
"wrong.target.for.polymorphic.signature.definition",
target.name);
}
// Pull the flag through for better diagnostics, even on a bad target.
s.flags_field |= Flags.POLYMORPHIC_SIGNATURE;
}
if (!annotated.add(a.type.tsym))
log.error(a.pos, "duplicate.annotation");
}

79
langtools/src/share/classes/com/sun/tools/javac/comp/Resolve.java
View file

@ -399,7 +399,6 @@ public class Resolve {
else {
Symbol s2 = ((MethodSymbol)sym).implementation(site.tsym, types, true);
return (s2 == null || s2 == sym || sym.owner == s2.owner ||
s2.isPolymorphicSignatureGeneric() ||
!types.isSubSignature(types.memberType(site, s2), types.memberType(site, sym)));
}
}
@ -449,7 +448,6 @@ public class Resolve {
boolean useVarargs,
Warner warn)
throws Infer.InferenceException {
boolean polymorphicSignature = m.isPolymorphicSignatureGeneric() && allowMethodHandles;
if (useVarargs && (m.flags() & VARARGS) == 0)
throw inapplicableMethodException.setMessage();
Type mt = types.memberType(site, m);
@ -490,8 +488,7 @@ public class Resolve {
}
// find out whether we need to go the slow route via infer
boolean instNeeded = tvars.tail != null || /*inlined: tvars.nonEmpty()*/
polymorphicSignature;
boolean instNeeded = tvars.tail != null; /*inlined: tvars.nonEmpty()*/
for (List<Type> l = argtypes;
l.tail != null/*inlined: l.nonEmpty()*/ && !instNeeded;
l = l.tail) {
@ -499,9 +496,7 @@ public class Resolve {
}
if (instNeeded)
return polymorphicSignature ?
infer.instantiatePolymorphicSignatureInstance(env, site, m.name, (MethodSymbol)m, argtypes) :
infer.instantiateMethod(env,
return infer.instantiateMethod(env,
tvars,
(MethodType)mt,
m,
@ -1740,25 +1735,18 @@ public class Resolve {
steps = steps.tail;
}
if (sym.kind >= AMBIGUOUS) {
if (site.tsym.isPolymorphicSignatureGeneric()) {
//polymorphic receiver - synthesize new method symbol
//if nothing is found return the 'first' error
MethodResolutionPhase errPhase =
currentResolutionContext.firstErroneousResolutionPhase();
sym = access(currentResolutionContext.resolutionCache.get(errPhase),
pos, location, site, name, true, argtypes, typeargtypes);
env.info.varArgs = errPhase.isVarargsRequired;
} else if (allowMethodHandles) {
MethodSymbol msym = (MethodSymbol)sym;
if (msym.isSignaturePolymorphic(types)) {
env.info.varArgs = false;
sym = findPolymorphicSignatureInstance(env,
site, name, null, argtypes);
return findPolymorphicSignatureInstance(env, sym, argtypes);
}
else {
//if nothing is found return the 'first' error
MethodResolutionPhase errPhase =
currentResolutionContext.firstErroneousResolutionPhase();
sym = access(currentResolutionContext.resolutionCache.get(errPhase),
pos, location, site, name, true, argtypes, typeargtypes);
env.info.varArgs = errPhase.isVarargsRequired;
}
} else if (allowMethodHandles && sym.isPolymorphicSignatureGeneric()) {
//non-instantiated polymorphic signature - synthesize new method symbol
env.info.varArgs = false;
sym = findPolymorphicSignatureInstance(env,
site, name, (MethodSymbol)sym, argtypes);
}
return sym;
}
@ -1771,40 +1759,25 @@ public class Resolve {
* Searches in a side table, not the main scope of the site.
* This emulates the lookup process required by JSR 292 in JVM.
* @param env Attribution environment
* @param site The original type from where the selection takes place.
* @param name The method's name.
* @param spMethod A template for the implicit method, or null.
* @param argtypes The required argument types.
* @param typeargtypes The required type arguments.
* @param spMethod signature polymorphic method - i.e. MH.invokeExact
* @param argtypes The required argument types
*/
Symbol findPolymorphicSignatureInstance(Env<AttrContext> env, Type site,
Name name,
MethodSymbol spMethod, // sig. poly. method or null if none
Symbol findPolymorphicSignatureInstance(Env<AttrContext> env,
Symbol spMethod,
List<Type> argtypes) {
Type mtype = infer.instantiatePolymorphicSignatureInstance(env,
site, name, spMethod, argtypes);
long flags = ABSTRACT | HYPOTHETICAL | POLYMORPHIC_SIGNATURE |
(spMethod != null ?
spMethod.flags() & Flags.AccessFlags :
Flags.PUBLIC | Flags.STATIC);
Symbol m = null;
for (Scope.Entry e = polymorphicSignatureScope.lookup(name);
e.scope != null;
e = e.next()) {
Symbol sym = e.sym;
if (types.isSameType(mtype, sym.type) &&
(sym.flags() & Flags.STATIC) == (flags & Flags.STATIC) &&
types.isSameType(sym.owner.type, site)) {
m = sym;
break;
(MethodSymbol)spMethod, argtypes);
for (Symbol sym : polymorphicSignatureScope.getElementsByName(spMethod.name)) {
if (types.isSameType(mtype, sym.type)) {
return sym;
}
}
if (m == null) {
// create the desired method
m = new MethodSymbol(flags, name, mtype, site.tsym);
polymorphicSignatureScope.enter(m);
}
return m;
// create the desired method
long flags = ABSTRACT | HYPOTHETICAL | spMethod.flags() & Flags.AccessFlags;
Symbol msym = new MethodSymbol(flags, spMethod.name, mtype, spMethod.owner);
polymorphicSignatureScope.enter(msym);
return msym;
}
/** Resolve a qualified method identifier, throw a fatal error if not

6
langtools/src/share/classes/com/sun/tools/javac/jvm/ClassReader.java
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -1320,10 +1320,6 @@ public class ClassReader implements Completer {
sym.flags_field |= PROPRIETARY;
else
proxies.append(proxy);
if (majorVersion >= V51.major &&
proxy.type.tsym == syms.polymorphicSignatureType.tsym) {
sym.flags_field |= POLYMORPHIC_SIGNATURE;
}
}
annotate.later(new AnnotationCompleter(sym, proxies.toList()));
}

3
langtools/src/share/classes/com/sun/tools/javac/resources/compiler.properties
View file

@ -217,9 +217,6 @@ compiler.err.call.to.super.not.allowed.in.enum.ctor=\
compiler.err.no.superclass=\
{0} has no superclass
compiler.err.wrong.target.for.polymorphic.signature.definition=\
MethodHandle API building requires -target 7 runtimes or better; current is -target {0}
# 0: symbol, 1: type, 2: symbol, 3: type, 4: unused
compiler.err.concrete.inheritance.conflict=\
methods {0} from {1} and {2} from {3} are inherited with the same signature

1
langtools/test/tools/javac/diags/examples.not-yet.txt
View file

@ -37,7 +37,6 @@ compiler.err.type.var.more.than.once # UNUSED
compiler.err.type.var.more.than.once.in.result # UNUSED
compiler.err.unexpected.type
compiler.err.unsupported.cross.fp.lit # Scanner: host system dependent
compiler.err.wrong.target.for.polymorphic.signature.definition # Transitional 292
compiler.misc.bad.class.file.header # bad class file
compiler.misc.bad.class.signature # bad class file
compiler.misc.bad.const.pool.tag # bad class file