Debugger: Add verbose logging for EA-125569, fix possible issue

idea/jvm-debugger/jvm-debugger-core/src/org/jetbrains/kotlin/idea/debugger/breakpoints/breakpointTypeUtils.kt

@@ -18,6 +18,7 @@ package org.jetbrains.kotlin.idea.debugger.breakpoints
 
 import com.intellij.debugger.SourcePosition
 import com.intellij.debugger.ui.breakpoints.JavaLineBreakpointType
+import com.intellij.openapi.diagnostic.Logger
 import com.intellij.openapi.editor.Document
 import com.intellij.openapi.fileEditor.FileDocumentManager
 import com.intellij.openapi.project.Project
@@ -33,6 +34,7 @@ import com.intellij.xdebugger.impl.XSourcePositionImpl
 import org.jetbrains.kotlin.idea.KotlinFileType
 import org.jetbrains.kotlin.idea.caches.resolve.analyze
 import org.jetbrains.kotlin.idea.core.util.CodeInsightUtils
+import org.jetbrains.kotlin.idea.core.util.attachmentByPsiFile
 import org.jetbrains.kotlin.idea.core.util.getLineNumber
 import org.jetbrains.kotlin.idea.debugger.findElementAtLine
 import org.jetbrains.kotlin.idea.util.application.runReadAction
@@ -47,6 +49,8 @@ import java.util.*
 
 interface KotlinBreakpointType
 
+private val LOG = Logger.getInstance("BreakpointTypeUtilsKt")
+
 class ApplicabilityResult(val isApplicable: Boolean, val shouldStop: Boolean) {
     companion object {
         @JvmStatic
@@ -83,7 +87,7 @@ fun isBreakpointApplicable(file: VirtualFile, line: Int, project: Project, check
         val checked = HashSet<PsiElement>()
 
         XDebuggerUtil.getInstance().iterateLine(project, document, line, fun(element: PsiElement): Boolean {
-            if (element is PsiWhiteSpace || element.getParentOfType<PsiComment>(false) != null) {
+            if (element is PsiWhiteSpace || element.getParentOfType<PsiComment>(false) != null || !element.isValid) {
                 return true
             }
 
@@ -112,6 +116,12 @@ private fun getTopmostParentOnLineOrSelf(element: PsiElement, document: Document
     var parent = current.parent
     while (parent != null) {
         val offset = parent.textOffset
+        if (offset > document.textLength) {
+            val containingFile = element.containingFile
+            val attachments = if (containingFile != null) arrayOf(attachmentByPsiFile(containingFile)) else emptyArray()
+            LOG.error("Wrong offset: $offset for line $line. Should be in range: [0, ${document.textLength}].", *attachments)
+            break
+        }
         if (offset >= 0 && document.getLineNumber(offset) != line) break
 
         current = parent