[FE] Introduce diagnostic markers

This is needed to move diagnostic renderers and positioning
  strategies to common modules for both frontends

compiler/frontend.common-psi/src/org/jetbrains/kotlin/diagnostics/DiagnosticMarker.kt

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.diagnostics
+
+import com.intellij.psi.PsiElement
+
+interface DiagnosticMarker {
+    val psiElement: PsiElement
+    val factoryName: String
+}
+
+interface DiagnosticWithParameters1Marker<A> : DiagnosticMarker {
+    val a: A
+}
+
+interface DiagnosticWithParameters2Marker<A, B> : DiagnosticMarker {
+    val a: A
+    val b: B
+}
+
+interface DiagnosticWithParameters3Marker<A, B, C> : DiagnosticMarker {
+    val a: A
+    val b: B
+    val c: C
+}
+
+interface DiagnosticWithParameters4Marker<A, B, C, D> : DiagnosticMarker {
+    val a: A
+    val b: B
+    val c: C
+    val d: D
+}

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/Diagnostic.kt

@@ -18,7 +18,10 @@ package org.jetbrains.kotlin.diagnostics
 import com.intellij.psi.PsiElement
 import com.intellij.psi.PsiFile
 
-interface Diagnostic : UnboundDiagnostic {
+interface Diagnostic : UnboundDiagnostic, DiagnosticMarker {
-    val psiElement: PsiElement
+    override val psiElement: PsiElement
     val psiFile: PsiFile
+
+    override val factoryName: String
+        get() = factory.name
 }

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/DiagnosticWithParameters1.java

@@ -21,7 +21,7 @@ import org.jetbrains.annotations.NotNull;
 
 import java.util.Objects;
 
-public class DiagnosticWithParameters1<E extends PsiElement, A> extends AbstractDiagnostic<E> {
+public class DiagnosticWithParameters1<E extends PsiElement, A> extends AbstractDiagnostic<E> implements DiagnosticWithParameters1Marker<A> {
     private final A a;
 
     public DiagnosticWithParameters1(
@@ -42,6 +42,7 @@ public class DiagnosticWithParameters1<E extends PsiElement, A> extends Abstract
     }
 
     @NotNull
+    @Override
     public A getA() {
         return a;
     }

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/DiagnosticWithParameters2.java

@@ -21,7 +21,7 @@ import org.jetbrains.annotations.NotNull;
 
 import java.util.Objects;
 
-public class DiagnosticWithParameters2<E extends PsiElement, A, B> extends AbstractDiagnostic<E> {
+public class DiagnosticWithParameters2<E extends PsiElement, A, B> extends AbstractDiagnostic<E> implements DiagnosticWithParameters2Marker<A, B>{
     private final A a;
     private final B b;
 
@@ -45,11 +45,13 @@ public class DiagnosticWithParameters2<E extends PsiElement, A, B> extends Abstr
     }
 
     @NotNull
+    @Override
     public A getA() {
         return a;
     }
 
     @NotNull
+    @Override
     public B getB() {
         return b;
     }

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/DiagnosticWithParameters3.java

@@ -21,7 +21,7 @@ import org.jetbrains.annotations.NotNull;
 
 import java.util.Objects;
 
-public class DiagnosticWithParameters3<E extends PsiElement, A, B, C> extends AbstractDiagnostic<E> {
+public class DiagnosticWithParameters3<E extends PsiElement, A, B, C> extends AbstractDiagnostic<E> implements DiagnosticWithParameters3Marker<A, B, C> {
     private final A a;
     private final B b;
     private final C c;
@@ -48,16 +48,19 @@ public class DiagnosticWithParameters3<E extends PsiElement, A, B, C> extends Ab
     }
 
     @NotNull
-    public A getA() {
+    @Override
-        return a;
-    }
-
-    @NotNull
     public B getB() {
         return b;
     }
 
     @NotNull
+    @Override
+    public A getA() {
+        return a;
+    }
+
+    @NotNull
+    @Override
     public C getC() {
         return c;
     }

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/DiagnosticWithParameters4.java

@@ -21,7 +21,7 @@ import org.jetbrains.annotations.NotNull;
 
 import java.util.Objects;
 
-public class DiagnosticWithParameters4<E extends PsiElement, A, B, C, D> extends AbstractDiagnostic<E> {
+public class DiagnosticWithParameters4<E extends PsiElement, A, B, C, D> extends AbstractDiagnostic<E> implements DiagnosticWithParameters4Marker<A, B, C, D> {
     private final A a;
     private final B b;
     private final C c;
@@ -51,21 +51,25 @@ public class DiagnosticWithParameters4<E extends PsiElement, A, B, C, D> extends
     }
 
     @NotNull
+    @Override
     public A getA() {
         return a;
     }
 
     @NotNull
+    @Override
     public B getB() {
         return b;
     }
 
     @NotNull
+    @Override
     public C getC() {
         return c;
     }
 
     @NotNull
+    @Override
     public D getD() {
         return d;
     }

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/ParametrizedDiagnostic.java

@@ -23,4 +23,10 @@ public interface ParametrizedDiagnostic<E extends PsiElement> extends Diagnostic
     @NotNull
     @Override
     E getPsiElement();
+
+    @NotNull
+    @Override
+    default String getFactoryName() {
+        return getFactory().getName();
+    }
 }