Define J9ClassEnv::primitiveArrayComponentType()

This (along with a separate change to VP) will allow VP to refine unsafe
shadow to a primitive array shadow whenever it can determine that the
base object is an instance of a particular primitive array type.

runtime/compiler/env/J9ClassEnv.cpp

@@ -315,6 +315,38 @@ J9::ClassEnv::isPrimitiveArray(TR::Compilation *comp, TR_OpaqueClassBlock *clazz
  return comp->fej9()->isPrimitiveArray(clazz);
  }
 
+TR::DataTypes
+J9::ClassEnv::primitiveArrayComponentType(TR::Compilation *comp, TR_OpaqueClassBlock *clazz)
+ {
+ TR_ASSERT_FATAL(
+ self()->isPrimitiveArray(comp, clazz), "not a primitive array: %p", clazz);
+
+ static const int32_t firstNewArrayTypeCode = 4;
+ static const TR::DataTypes newArrayTypes[] =
+ {
+ TR::Int8, // boolean
+ TR::Int16, // char
+ TR::Float,
+ TR::Double,
+ TR::Int8,
+ TR::Int16,
+ TR::Int32,
+ TR::Int64,
+ };
+
+ TR_J9VMBase *fej9 = comp->fej9();
+ for (int32_t i = 0; i < sizeof(newArrayTypes) / sizeof(newArrayTypes[0]); i++)
+ {
+ TR_OpaqueClassBlock *primitiveArrayClass =
+ fej9->getClassFromNewArrayTypeNonNull(firstNewArrayTypeCode + i);
+
+ if (clazz == primitiveArrayClass)
+ return newArrayTypes[i];
+ }
+
+ return TR::NoType;
+ }
+
 bool
 J9::ClassEnv::isReferenceArray(TR::Compilation *comp, TR_OpaqueClassBlock *clazz)
  {

runtime/compiler/env/J9ClassEnv.hpp

@@ -38,6 +38,7 @@ namespace J9 { typedef J9::ClassEnv ClassEnvConnector; }
 #include "env/jittypes.h"
 #include "env/OMRClassEnv.hpp"
 #include "infra/Annotations.hpp"
+#include "il/DataTypes.hpp"
 #include "j9.h"
 
 namespace TR { class SymbolReference; }
@@ -158,6 +159,7 @@ class OMR_EXTENSIBLE ClassEnv : public OMR::ClassEnvConnector
  bool isPrimitiveClass(TR::Compilation *comp, TR_OpaqueClassBlock *clazz);
  bool isAnonymousClass(TR::Compilation *comp, TR_OpaqueClassBlock *clazz);
  bool isPrimitiveArray(TR::Compilation *comp, TR_OpaqueClassBlock *);
+ TR::DataTypes primitiveArrayComponentType(TR::Compilation *comp, TR_OpaqueClassBlock *);
  bool isReferenceArray(TR::Compilation *comp, TR_OpaqueClassBlock *);
  bool isClassArray(TR::Compilation *comp, TR_OpaqueClassBlock *);
  bool isClassFinal(TR::Compilation *comp, TR_OpaqueClassBlock *);