8168915: [JVMCI] use MethodParameters attribute instead of depending on -g option for sanity checks

Reviewed-by: kvn

hotspot/src/jdk.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotResolvedJavaMethodImpl.java

@@ -33,8 +33,10 @@ import static jdk.vm.ci.hotspot.UnsafeAccess.UNSAFE;
 
 import java.lang.annotation.Annotation;
 import java.lang.reflect.Executable;
+import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
 import java.lang.reflect.Type;
+import java.util.Arrays;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -459,6 +461,22 @@ final class HotSpotResolvedJavaMethodImpl extends HotSpotMethod implements HotSp
         return constantPool;
     }
 
+    @Override
+    public Parameter[] getParameters() {
+        Executable javaMethod = toJava();
+        if (javaMethod == null) {
+            return null;
+        }
+
+        java.lang.reflect.Parameter[] javaParameters = javaMethod.getParameters();
+        Parameter[] res = new Parameter[javaParameters.length];
+        for (int i = 0; i < res.length; i++) {
+            java.lang.reflect.Parameter src = javaParameters[i];
+            res[i] = new Parameter(src.getName(), src.getModifiers(), this, i);
+        }
+        return res;
+    }
+
     @Override
     public Annotation[][] getParameterAnnotations() {
         Executable javaMethod = toJava();
@@ -529,13 +547,31 @@ final class HotSpotResolvedJavaMethodImpl extends HotSpotMethod implements HotSp
         return result;
     }
 
+    private static Method searchMethods(Method[] methods, String name, Class<?> returnType, Class<?>[] parameterTypes) {
+        for (Method m : methods) {
+            if (m.getName().equals(name) && returnType.equals(m.getReturnType()) && Arrays.equals(m.getParameterTypes(), parameterTypes)) {
+                return m;
+            }
+        }
+        return null;
+    }
+
     private Executable toJava() {
         if (toJavaCache != null) {
             return toJavaCache;
         }
         try {
             Class<?>[] parameterTypes = signatureToTypes();
-            Executable result = isConstructor() ? holder.mirror().getDeclaredConstructor(parameterTypes) : holder.mirror().getDeclaredMethod(name, parameterTypes);
+            Class<?> returnType = ((HotSpotResolvedJavaType) getSignature().getReturnType(holder).resolve(holder)).mirror();
+
+            Executable result;
+            if (isConstructor()) {
+                result = holder.mirror().getDeclaredConstructor(parameterTypes);
+            } else {
+                // Do not use Method.getDeclaredMethod() as it can return a bridge method
+                // when this.isBridge() is false and vice versa.
+                result = searchMethods(holder.mirror().getDeclaredMethods(), name, returnType, parameterTypes);
+            }
             toJavaCache = result;
             return result;
         } catch (NoSuchMethodException | NoClassDefFoundError e) {

hotspot/src/jdk.vm.ci/share/classes/jdk.vm.ci.meta/src/jdk/vm/ci/meta/ResolvedJavaMethod.java

@@ -26,6 +26,7 @@ import java.lang.annotation.Annotation;
 import java.lang.reflect.AnnotatedElement;
 import java.lang.reflect.Array;
 import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
 import java.lang.reflect.Type;
 
 /**
@@ -173,6 +174,133 @@ public interface ResolvedJavaMethod extends JavaMethod, InvokeTarget, ModifiersP
      */
     ConstantPool getConstantPool();
 
+    /**
+     * A {@code Parameter} provides information about method parameters.
+     */
+    public static class Parameter implements AnnotatedElement {
+        private final String name;
+        private final ResolvedJavaMethod method;
+        private final int modifiers;
+        private final int index;
+
+        /**
+         * Constructor for {@code Parameter}.
+         *
+         * @param name the name of the parameter
+         * @param modifiers the modifier flags for the parameter
+         * @param method the method which defines this parameter
+         * @param index the index of the parameter
+         */
+        public Parameter(String name,
+                        int modifiers,
+                        ResolvedJavaMethod method,
+                        int index) {
+            this.name = name;
+            this.modifiers = modifiers;
+            this.method = method;
+            this.index = index;
+        }
+
+        /**
+         * Gets the name of the parameter.
+         */
+        public String getName() {
+            return name;
+        }
+
+        /**
+         * Gets the method declaring the parameter.
+         */
+        public ResolvedJavaMethod getDeclaringMethod() {
+            return method;
+        }
+
+        /**
+         * Get the modifier flags for the parameter
+         */
+        public int getModifiers() {
+            return modifiers;
+        }
+
+        /**
+         * Gets the kind of the parameter.
+         */
+        public JavaKind getKind() {
+            return method.getSignature().getParameterKind(index);
+        }
+
+        /**
+         * Gets the formal type of the parameter.
+         */
+        public Type getParameterizedType() {
+            return method.getGenericParameterTypes()[index];
+        }
+
+        /**
+         * Gets the type of the parameter.
+         */
+        public JavaType getType() {
+            return method.getSignature().getParameterType(index, method.getDeclaringClass());
+        }
+
+        /**
+         * Determines if the parameter represents a variable argument list.
+         */
+        public boolean isVarArgs() {
+            return method.isVarArgs() && index == method.getSignature().getParameterCount(false) - 1;
+        }
+
+        public <T extends Annotation> T getAnnotation(Class<T> annotationClass) {
+            return method.getParameterAnnotations(annotationClass)[index];
+        }
+
+        public Annotation[] getAnnotations() {
+            return method.getParameterAnnotations()[index];
+        }
+
+        public Annotation[] getDeclaredAnnotations() {
+            return getAnnotations();
+        }
+
+        @Override
+        public String toString() {
+            Type type = getParameterizedType();
+            String typename = type.getTypeName();
+            if (isVarArgs()) {
+                typename = typename.replaceFirst("\\[\\]$", "...");
+            }
+
+            final StringBuilder sb = new StringBuilder(Modifier.toString(getModifiers()));
+            if (sb.length() != 0) {
+                sb.append(' ');
+            }
+            return sb.append(typename).append(' ').append(getName()).toString();
+        }
+
+        @Override
+        public boolean equals(Object obj) {
+            if (obj instanceof Parameter) {
+                Parameter other = (Parameter) obj;
+                return (other.method.equals(method) && other.index == index);
+            }
+            return false;
+        }
+
+        @Override
+        public int hashCode() {
+            return method.hashCode() ^ index;
+        }
+    }
+
+    /**
+     * Returns an array of {@code Parameter} objects that represent all the parameters to this
+     * method. Returns an array of length 0 if this method has no parameters. Returns {@code null}
+     * if the parameter information is unavailable.
+     */
+    default Parameter[] getParameters() {
+        return null;
+    }
+
     /**
      * Returns an array of arrays that represent the annotations on the formal parameters, in
      * declaration order, of this method.

hotspot/test/compiler/jvmci/jdk.vm.ci.runtime.test/src/jdk/vm/ci/runtime/test/TestResolvedJavaMethod.java

@@ -33,6 +33,7 @@
 
 package jdk.vm.ci.runtime.test;
 
+import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
@@ -60,6 +61,7 @@ import org.junit.Test;
 import jdk.vm.ci.meta.ConstantPool;
 import jdk.vm.ci.meta.ExceptionHandler;
 import jdk.vm.ci.meta.ResolvedJavaMethod;
+import jdk.vm.ci.meta.ResolvedJavaMethod.Parameter;
 import jdk.vm.ci.meta.ResolvedJavaType;
 
 /**
@@ -266,6 +268,26 @@ public class TestResolvedJavaMethod extends MethodUniverse {
         }
     }
 
+    @Test
+    public void getParametersTest() {
+        for (Map.Entry<Method, ResolvedJavaMethod> e : methods.entrySet()) {
+            java.lang.reflect.Parameter[] expected = e.getKey().getParameters();
+            Parameter[] actual = e.getValue().getParameters();
+            assertEquals(actual.length, expected.length);
+            for (int i = 0; i < actual.length; i++) {
+                java.lang.reflect.Parameter exp = expected[i];
+                Parameter act = actual[i];
+                assertEquals(exp.getName(), act.getName());
+                assertEquals(exp.getModifiers(), act.getModifiers());
+                assertEquals(exp.getModifiers(), act.getModifiers());
+                assertArrayEquals(exp.getAnnotations(), act.getAnnotations());
+                assertEquals(exp.getType().getName(), act.getType().toClassName());
+                assertEquals(exp.getParameterizedType(), act.getParameterizedType());
+                assertEquals(metaAccess.lookupJavaMethod(exp.getDeclaringExecutable()), act.getDeclaringMethod());
+            }
+        }
+    }
+
     @Retention(RetentionPolicy.RUNTIME)
     @Target(ElementType.METHOD)
     @interface TestAnnotation {