Debugger: A dirty fix for setting breakpoints inside finally {} in case if exception is thrown from try {} (#KT-22654)

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

@@ -1488,6 +1488,10 @@ public class ExpressionCodegen extends KtVisitor<StackValue, StackValue> impleme
         }
 
         if (tryCatchBlockEnd != null) {
+            if (finallyBlockStackElement != null) {
+                markLineNumber(finallyBlockStackElement.expression, true);
+            }
+
             v.goTo(tryCatchBlockEnd);
         }
 

compiler/testData/lineNumber/custom/tryCatchFinally.kt

@@ -16,4 +16,4 @@ fun foo() {
     }
 }
 
-// 2 3 7 4 5 7 8 +10 11 15 12 13 15 10 17
+// 2 3 7 8 4 5 7 8 7 8 +10 11 15 16 12 13 15 16 15 10 17

compiler/testData/lineNumber/custom/tryFinally.kt

@@ -12,4 +12,4 @@ fun foo() {
     }
 }
 
-// 2 3 5 6 +8 9 11 8 13
+// 2 3 5 6 5 6 +8 9 11 12 11 8 13

idea/idea-jvm/src/org/jetbrains/kotlin/idea/debugger/KotlinPositionManager.kt

@@ -58,10 +58,8 @@ import org.jetbrains.kotlin.idea.util.ProjectRootsUtil
 import org.jetbrains.kotlin.idea.util.application.runReadAction
 import org.jetbrains.kotlin.load.java.JvmAbi
 import org.jetbrains.kotlin.name.FqName
-import org.jetbrains.kotlin.psi.KtClass
+import org.jetbrains.kotlin.psi.*
-import org.jetbrains.kotlin.psi.KtElement
+import org.jetbrains.kotlin.psi.psiUtil.getStrictParentOfType
-import org.jetbrains.kotlin.psi.KtFile
-import org.jetbrains.kotlin.psi.KtFunction
 import org.jetbrains.kotlin.resolve.inline.InlineUtil
 import org.jetbrains.kotlin.resolve.jvm.JvmClassName
 import com.intellij.debugger.engine.DebuggerUtils as JDebuggerUtils
@@ -166,7 +164,16 @@ class KotlinPositionManager(private val myDebugProcess: DebugProcess) : MultiReq
             // have been merged into one), but it's impossible to correctly map locations to actual source expressions now.
             val locationIndex = sameLineLocations.indexOf(location)
             if (locationIndex > 0) {
-                return KotlinReentrantSourcePosition(SourcePosition.createFromLine(psiFile, sourceLineNumber))
+                /*
+                    `finally {}` block code is placed in the class file twice.
+                    Unless the debugger metadata is available, we can't figure out if we are inside `finally {}`, so we have to check it using PSI.
+                    This is conceptually wrong and won't work in some cases, but it's still better than nothing.
+                */
+                val elementAt = psiFile.getLineStartOffset(lineNumber)?.let { psiFile.findElementAt(it) }
+                val isInsideDuplicatedFinally = elementAt != null && elementAt.getStrictParentOfType<KtFinallySection>() != null
+                if (!isInsideDuplicatedFinally) {
+                    return KotlinReentrantSourcePosition(SourcePosition.createFromLine(psiFile, sourceLineNumber))
+                }
             }
         }
 

idea/testData/debugger/tinyApp/src/stepping/custom/finallyBlock.kt

@@ -0,0 +1,49 @@
+package finallyBlock
+
+fun throwException() { throw RuntimeException() }
+fun foo() {}
+
+fun main(args: Array<String>) {
+    fun wrap(f: () -> Unit) = try { f() } catch (e: Throwable) {}
+
+    wrap(::test1)
+    wrap(::test2)
+    wrap(::test3)
+}
+
+fun test1() {
+    try {
+        //Breakpoint!
+        throwException()
+    } finally {
+        //Breakpoint!
+        foo()
+    }
+}
+
+fun test2() {
+    try {
+        //Breakpoint!
+        foo()
+    } finally {
+        //Breakpoint!
+        foo()
+    }
+}
+
+fun test3() {
+    try {
+        //Breakpoint!
+        throwException()
+    } finally {
+        //Breakpoint!
+        try {
+            throwException()
+        } finally {
+            //Breakpoint!
+            foo()
+        }
+    }
+}
+
+// RESUME: 7

idea/testData/debugger/tinyApp/src/stepping/custom/finallyBlock.out

@@ -0,0 +1,19 @@
+LineBreakpoint created at finallyBlock.kt:17
+LineBreakpoint created at finallyBlock.kt:20
+LineBreakpoint created at finallyBlock.kt:27
+LineBreakpoint created at finallyBlock.kt:30
+LineBreakpoint created at finallyBlock.kt:37
+LineBreakpoint created at finallyBlock.kt:40
+LineBreakpoint created at finallyBlock.kt:44
+Run Java
+Connected to the target VM
+finallyBlock.kt:17
+finallyBlock.kt:20
+finallyBlock.kt:27
+finallyBlock.kt:30
+finallyBlock.kt:37
+finallyBlock.kt:40
+finallyBlock.kt:44
+Disconnected from the target VM
+
+Process finished with exit code 0

idea/tests/org/jetbrains/kotlin/idea/debugger/KotlinSteppingTestGenerated.java

@@ -1176,6 +1176,12 @@ public class KotlinSteppingTestGenerated extends AbstractKotlinSteppingTest {
             doCustomTest(fileName);
         }
 
+        @TestMetadata("finallyBlock.kt")
+        public void testFinallyBlock() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/debugger/tinyApp/src/stepping/custom/finallyBlock.kt");
+            doCustomTest(fileName);
+        }
+
         @TestMetadata("funLiteral.kt")
         public void testFunLiteral() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/debugger/tinyApp/src/stepping/custom/funLiteral.kt");