svm: add JVMCIReflectionUtil#getConstructors

Author: zapster

substratevm/src/com.oracle.svm.util/src/com/oracle/svm/util/JVMCIReflectionUtil.java

@@ -32,6 +32,7 @@
 import jdk.graal.compiler.debug.GraalError;
 import jdk.vm.ci.meta.JavaType;
 import jdk.vm.ci.meta.MetaAccessProvider;
+import jdk.vm.ci.meta.ModifiersProvider;
 import jdk.vm.ci.meta.ResolvedJavaField;
 import jdk.vm.ci.meta.ResolvedJavaMethod;
 import jdk.vm.ci.meta.ResolvedJavaType;
@@ -134,6 +135,15 @@ public static ResolvedJavaMethod getDeclaredConstructor(MetaAccessProvider metaA
         return getDeclaredConstructor(false, metaAccess, declaringClass, parameterTypes);
     }
 
+    /**
+     * Gets the constructors declared by {@code declaringClass}. Like
+     * {@link Class#getConstructors()}, this only returns public constructors and does not consider
+     * super classes.
+     */
+    public static ResolvedJavaMethod[] getConstructors(ResolvedJavaType declaringClass) {
+        return Arrays.stream(declaringClass.getDeclaredConstructors(false)).filter(ModifiersProvider::isPublic).toArray(ResolvedJavaMethod[]::new);
+    }
+
     private static ResolvedJavaMethod findMethod(ResolvedJavaType declaringClass, ResolvedJavaMethod[] methods, String name, ResolvedJavaType... parameterTypes) {
         ResolvedJavaMethod res = null;
         for (ResolvedJavaMethod m : methods) {