Most specific method in diagnostic generation for overload resolution
B. Blaser
bsrbnd at gmail.com
Wed Oct 4 10:12:56 UTC 2017
On 4 October 2017 at 01:40, Vicente Romero <vicente.romero at oracle.com> wrote:
> Hi Bernard,
>
> [1] is a link to the fix for the bug you reported. I used your email to mark
> it as contributed by you. Finally we made some minor adjustments to the code
> in order to avoid cloning the key set.
Perfect, thanks!
Bernard
> Thanks!
> Vicente
>
> [1] http://hg.openjdk.java.net/jdk10/master/rev/2e947e1bd907
>
> On 09/20/2017 10:56 AM, B. Blaser wrote:
>>
>> Hi,
>>
>> Related to [1], I wrote a specialized map to store only the most
>> specific candidates during the diagnostic generation for overload
>> resolution, here under.
>>
>> It's then used in "Resolve.InapplicableSymbolsError.mapCandidates()"
>> when non-applicable methods are collected to generate the diagnostic.
>>
>> What do you think?
>> Bernard
>>
>> [1]
>> http://mail.openjdk.java.net/pipermail/compiler-dev/2017-September/011062.html
>>
>> diff --git
>> a/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Resolve.java
>> b/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Resolve.java
>> --- a/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Resolve.java
>> +++ b/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Resolve.java
>> @@ -59,6 +59,7 @@
>> import java.util.HashSet;
>> import java.util.Iterator;
>> import java.util.LinkedHashMap;
>> +import java.util.LinkedList;
>> import java.util.Map;
>> import java.util.Set;
>> import java.util.function.BiFunction;
>> @@ -3995,14 +3996,29 @@
>> }
>> //where
>> private Map<Symbol, JCDiagnostic> mapCandidates() {
>> - Map<Symbol, JCDiagnostic> candidates = new
>> LinkedHashMap<>();
>> + MostSpecificMap candidates = new MostSpecificMap();
>> for (Candidate c : resolveContext.candidates) {
>> if (c.isApplicable()) continue;
>> - candidates.put(c.sym, c.details);
>> + candidates.put(c);
>> }
>> return candidates;
>> }
>>
>> + @SuppressWarnings("serial")
>> + private class MostSpecificMap extends
>> LinkedHashMap<Symbol, JCDiagnostic> {
>> + private void put(Candidate c) {
>> + new LinkedList<>(keySet()).stream()
>> + .filter( s -> !s.equals(c.sym) )
>> + .filter( s -> c.sym.overrides(s,
>> (TypeSymbol)s.owner, types, false) )
>> + .forEach( s -> remove(s) );
>> +
>> + if (!keySet().stream()
>> + .filter( s -> !s.equals(c.sym) )
>> + .anyMatch( s -> s.overrides(c.sym,
>> (TypeSymbol)c.sym.owner, types, false) ))
>> + put(c.sym, c.details);
>> + }
>> + }
>> +
>> Map<Symbol, JCDiagnostic> filterCandidates(Map<Symbol,
>> JCDiagnostic> candidatesMap) {
>> Map<Symbol, JCDiagnostic> candidates = new
>> LinkedHashMap<>();
>> for (Map.Entry<Symbol, JCDiagnostic> _entry :
>> candidatesMap.entrySet()) {
>
>
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