RFR: 8262891: Compiler implementation for Pattern Matching for switch (Preview)

[Maurizio Cimadamore]

On Tue, 4 May 2021 20:35:45 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> This is a preview of a patch implementing JEP 406: Pattern Matching for switch (Preview):
>> https://bugs.openjdk.java.net/browse/JDK-8213076
>> 
>> The current draft of the specification is here:
>> http://cr.openjdk.java.net/~gbierman/jep406/jep406-20210430/specs/patterns-switch-jls.html
>> 
>> A summary of notable parts of the patch:
>> -to support cases expressions and patterns in cases, there is a new common superinterface for expressions and patterns, `CaseLabelTree`, which expressions and patterns implement, and a list of case labels is returned from `CaseTree.getLabels()`.
>> -to support `case default`, there is an implementation of `CaseLabelTree` that represents it (`DefaultCaseLabelTree`). It is used also to represent the conventional `default` internally and in the newly added methods.
>> -in the parser, parenthesized patterns and expressions need to be disambiguated when parsing case labels.
>> -Lower has been enhanced to handle `case null` for ordinary (boxed-primitive, String, enum) switches. This is a bit tricky for boxed primitives, as there is no value that is not part of the input domain so that could be used to represent `case null`. Requires a bit shuffling with values.
>> -TransPatterns has been enhanced to handle the pattern matching switch. It produces code that delegates to a new bootstrap method, that will classify the input value to the switch and return the case number, to which the switch then jumps. To support guards, the switches (and the bootstrap method) are restartable. The bootstrap method as such is written very simply so far, but could be much more optimized later.
>> -nullable type patterns are `case String s, null`/`case null, String s`/`case null: case String s:`/`case String s: case null:`, handling of these required a few tricks in `Attr`, `Flow` and `TransPatterns`.
>> 
>> The specdiff for the change is here (to be updated):
>> http://cr.openjdk.java.net/~jlahoda/8265981/specdiff.preview.01/overview-summary.html
>
> src/java.base/share/classes/java/lang/runtime/SwitchBootstraps.java line 102:
> 
>> 100:      * @param labels non-null case labels - {@code String} and {@code Integer} constants
>> 101:      *                        and {@code Class} instances
>> 102:      * @return the index into {@code labels} of the target value, if the target
> 
> Doesn't return an index. Returns a CallSite which, when invoked with an argument of type E (where E is the type of the target expression), returns the index into...

It should also mention that the handle returned accepts a start index (which is used by the continue logic)

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PR: https://git.openjdk.java.net/jdk/pull/3863