Debugger: allow Evaluate Expression in context of File (for some synthetic methods or when file was changed during debug and breakpoint line no longer match the actual line)

idea/ide-common/src/org/jetbrains/kotlin/resolve/util/codeFragmentResolveUtils.kt

@@ -78,6 +78,10 @@ public fun JetCodeFragment.getScopeAndDataFlowForAnalyzeFragment(
             scopeForContextElement = contextForElement[BindingContext.RESOLUTION_SCOPE, correctedContext]
             dataFlowInfo = contextForElement.getDataFlowInfo(correctedContext)
         }
+        is JetFile -> {
+            scopeForContextElement = resolveSession.getFileScopeProvider().getFileScope(context)
+            dataFlowInfo = DataFlowInfo.EMPTY
+        }
         else -> return null
     }
 

idea/src/org/jetbrains/kotlin/idea/debugger/KotlinEditorTextProvider.kt

@@ -56,9 +56,7 @@ class KotlinEditorTextProvider : EditorTextProvider {
         }
 
         fun findExpressionInner(element: PsiElement, allowMethodCalls: Boolean): JetExpression? {
-            if (PsiTreeUtil.getParentOfType(element, javaClass<JetUserType>(), javaClass<JetImportDirective>(), javaClass<JetPackageDirective>()) != null) {
-                return null
-            }
+            if (!isAcceptedAsCodeFragmentContext(element)) return null
 
             val jetElement = PsiTreeUtil.getParentOfType(element, javaClass<JetElement>())
             if (jetElement == null) return null
@@ -116,6 +114,14 @@ class KotlinEditorTextProvider : EditorTextProvider {
             }
 
         }
+
+        private val NOT_ACCEPTED_AS_CONTEXT_TYPES =
+                arrayOf(javaClass<JetUserType>(), javaClass<JetImportDirective>(), javaClass<JetPackageDirective>())
+
+        fun isAcceptedAsCodeFragmentContext(element: PsiElement): Boolean {
+            return element.javaClass !in NOT_ACCEPTED_AS_CONTEXT_TYPES &&
+                   PsiTreeUtil.getParentOfType(element, *NOT_ACCEPTED_AS_CONTEXT_TYPES) == null
+        }
     }
 }
 

idea/src/org/jetbrains/kotlin/idea/debugger/evaluate/KotlinCodeFragmentFactory.kt

@@ -131,10 +131,11 @@ class KotlinCodeFragmentFactory: CodeFragmentFactory() {
             }
 
             val expressionAtOffset = PsiTreeUtil.findElementOfClassAtOffset(elementAt.getContainingFile()!!, elementAt.getTextOffset(), javaClass<JetExpression>(), false)
-            if (expressionAtOffset != null) {
+            if (expressionAtOffset != null && KotlinEditorTextProvider.isAcceptedAsCodeFragmentContext(elementAt)) {
                 return expressionAtOffset
             }
-            return KotlinEditorTextProvider.findExpressionInner(elementAt, true)
+
+            return KotlinEditorTextProvider.findExpressionInner(elementAt, true) ?: elementAt.getContainingFile()
         }
 
         //internal for tests

idea/src/org/jetbrains/kotlin/idea/debugger/evaluate/extractFunctionForDebuggerUtil.kt

@@ -77,11 +77,6 @@ fun getFunctionForExtractedFragment(
         val contextElement = getExpressionToAddDebugExpressionBefore(tmpFile, codeFragment.getContext(), breakpointLine)
         if (contextElement == null) return null
 
-        // Don't evaluate smth when breakpoint is on package directive (ex. for package classes)
-        if (contextElement is JetFile) {
-            throw EvaluateExceptionUtil.createEvaluateException("Cannot perform an action at this breakpoint ${breakpointFile.getName()}:${breakpointLine}")
-        }
-
         addImportsToFile(codeFragment.importsAsImportList(), tmpFile)
 
         val newDebugExpressions = addDebugExpressionBeforeContextElement(codeFragment, contextElement)
@@ -158,7 +153,7 @@ private fun getExpressionToAddDebugExpressionBefore(tmpFile: JetFile, contextEle
         return getExpressionToAddDebugExpressionBefore(tmpFile, containingFile.getContext(), line)
     }
 
-    fun shouldStop(el: PsiElement?, p: PsiElement?) = p is JetBlockExpression || el is JetDeclaration
+    fun shouldStop(el: PsiElement?, p: PsiElement?) = p is JetBlockExpression || el is JetDeclaration || el is JetFile
 
     var elementAt = tmpFile.getElementInCopy(contextElement)
 
@@ -192,6 +187,12 @@ private fun addDebugExpressionBeforeContextElement(codeFragment: JetCodeFragment
     }
 
     val elementBefore = when {
+        contextElement is JetFile -> {
+            val fakeFunction = psiFactory.createFunction("fun _debug_fun_() {}")
+            contextElement.add(psiFactory.createNewLine())
+            val newFakeFun = contextElement.add(fakeFunction) as JetNamedFunction
+            newFakeFun.getBodyExpression()!!.getLastChild()
+        }
         contextElement is JetProperty && !contextElement.isLocal() -> {
             val delegateExpressionOrInitializer = contextElement.getDelegateExpressionOrInitializer()
             if (delegateExpressionOrInitializer != null) {