Debugger: Allow to evaluate private properties from companion objects (KT-26795)

compiler/backend/src/org/jetbrains/kotlin/codegen/ExpressionCodegen.java

@@ -2049,7 +2049,7 @@ public class ExpressionCodegen extends KtVisitor<StackValue, StackValue> impleme
                  (forceField ||
                   (Visibilities.isPrivate(propertyDescriptor.getVisibility()) &&
                    isDefaultAccessor(propertyDescriptor.getGetter()) && isDefaultAccessor(propertyDescriptor.getSetter())))) {
-            fieldAccessorKind = AccessorKind.IN_CLASS_COMPANION;
+            fieldAccessorKind = JvmCodegenUtil.isDebuggerContext(context) ? AccessorKind.NORMAL : AccessorKind.IN_CLASS_COMPANION;
         }
         else if ((syntheticBackingField &&
                   context.getFirstCrossInlineOrNonInlineContext().getParentContext().getContextDescriptor() != containingDeclaration)) {

compiler/backend/src/org/jetbrains/kotlin/codegen/JvmCodegenUtil.java

@@ -247,7 +247,7 @@ public class JvmCodegenUtil {
         return Visibilities.isPrivate(accessor.getVisibility()) || accessor.getModality() == FINAL;
     }
 
-    private static boolean isDebuggerContext(@NotNull CodegenContext context) {
+    public static boolean isDebuggerContext(@NotNull CodegenContext context) {
         KtFile file = DescriptorToSourceUtils.getContainingFile(context.getContextDescriptor());
         return file != null && CodeFragmentUtilKt.getSuppressDiagnosticsInDebugMode(file);
     }

idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/privateFieldInCompanion.kt

@@ -0,0 +1,42 @@
+package privateFieldInCompanion
+
+class Foo {
+    companion object {
+        private const val PRIVATE_CONST = 1
+        const val PUBLIC_CONST = 2
+
+        private val PRIVATE_VAL = 3
+        val PUBLIC_VAL = 4
+
+        private val PRIVATE_STATIC = 5
+        val PUBLIC_STATIC = 6
+    }
+
+
+    fun foo() {
+        //Breakpoint!
+        val a = 5
+    }
+}
+
+fun main(args: Array<String>) {
+    Foo().foo()
+}
+
+// EXPRESSION: PRIVATE_CONST
+// RESULT: 1: I
+
+// EXPRESSION: PUBLIC_CONST
+// RESULT: 2: I
+
+// EXPRESSION: PRIVATE_VAL
+// RESULT: 3: I
+
+// EXPRESSION: PUBLIC_VAL
+// RESULT: 4: I
+
+// EXPRESSION: PRIVATE_STATIC
+// RESULT: 5: I
+
+// EXPRESSION: PUBLIC_STATIC
+// RESULT: 6: I

idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/privateFieldInCompanion.out

@@ -0,0 +1,13 @@
+LineBreakpoint created at privateFieldInCompanion.kt:18
+Run Java
+Connected to the target VM
+privateFieldInCompanion.kt:18
+Compile bytecode for PRIVATE_CONST
+Compile bytecode for PUBLIC_CONST
+Compile bytecode for PRIVATE_VAL
+Compile bytecode for PUBLIC_VAL
+Compile bytecode for PRIVATE_STATIC
+Compile bytecode for PUBLIC_STATIC
+Disconnected from the target VM
+
+Process finished with exit code 0

idea/tests/org/jetbrains/kotlin/idea/debugger/evaluate/KotlinEvaluateExpressionTestGenerated.java

@@ -281,6 +281,11 @@ public class KotlinEvaluateExpressionTestGenerated extends AbstractKotlinEvaluat
             runTest("idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/privateClass.kt");
         }
 
+        @TestMetadata("privateFieldInCompanion.kt")
+        public void testPrivateFieldInCompanion() throws Exception {
+            runTest("idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/privateFieldInCompanion.kt");
+        }
+
         @TestMetadata("privateMember.kt")
         public void testPrivateMember() throws Exception {
             runTest("idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/privateMember.kt");