[lworld] RFR: 8245584: [lworld] LW3 core reflection update

[Mandy Chung]

On Fri, 22 May 2020 19:24:16 GMT, Frederic Parain <fparain at openjdk.org> wrote:

>> This patch updates the core reflection for the new language model for inline classes.
>> 
>> - `Class::isInlineClass` returns true for inline classes
>> - `Class::valueType` returns the value projection of an inline class
>> - `Class::referenceType` returns the reference projection if it's an inline class,
>>     or this class if it's not an inline class
>> 
>> If this class has no val type or ref type, `Class::valueType` and `Class::referenceType`
>> return an empty `Optional`.   We can re-examine  if we should modernize Class API shape
>> where  we can rather than holding to the tradition.
>> 
>> I updated TestIntrinsics.java to use the new APIs for now to keep it compiled.
>> This test will be updated when the intrinsification of the old API `Class::asPrimaryType`
>> and `Class:asIndirectType` is removed.
>
> src/hotspot/share/oops/instanceKlass.cpp line 2775:
> 
>> 2774:   int dest_index = 0;
>> 2775:   dest[dest_index++] = is_value() ? 'Q' : 'L';
>> 2776:
> 
> Should use `JVM_SIGNATURE_CLASS` and `JVM_SIGNATURE_VALUETYPE` instead of hard-coded characters.

OK.  Will change this before I integrate.
diff --git a/src/hotspot/share/oops/instanceKlass.cpp b/src/hotspot/share/oops/instanceKlass.cpp
index c9b05990f41..b34421d7ccf 100644
--- a/src/hotspot/share/oops/instanceKlass.cpp
+++ b/src/hotspot/share/oops/instanceKlass.cpp
@@ -2772,7 +2772,7 @@ const char* InstanceKlass::signature_name() const {
 
   // Add L or Q as type indicator
   int dest_index = 0;
-  dest[dest_index++] = is_value() ? 'Q' : 'L';
+  dest[dest_index++] = is_value() ? JVM_SIGNATURE_VALUETYPE : JVM_SIGNATURE_CLASS;
 
   // Add the actual class name
   for (int src_index = 0; src_index < src_length; ) {

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PR: https://git.openjdk.java.net/valhalla/pull/53