Debugger: Hide call-site 'this' in inline functions in Kotlin variables mode (KT-30610)

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

@@ -104,6 +104,8 @@ public class AsmUtil {
 
     public static final String LABELED_THIS_FIELD = THIS + "_";
 
+    public static final String INLINE_DECLARATION_SITE_THIS = "this_";
+
     public static final String LABELED_THIS_PARAMETER = "$" + THIS + "$";
 
     public static final String CAPTURED_THIS_FIELD = "this$0";

compiler/backend/src/org/jetbrains/kotlin/codegen/inline/MethodInliner.kt

@@ -487,7 +487,7 @@ class MethodInliner(
             ) {
                 if (isInliningLambda || GENERATE_DEBUG_INFO) {
                     val varSuffix = if (inliningContext.isRoot && !isFakeLocalVariableForInline(name)) INLINE_FUN_VAR_SUFFIX else ""
-                    val varName = if (!varSuffix.isEmpty() && name == "this") name + "_" else name
+                    val varName = if (!varSuffix.isEmpty() && name == AsmUtil.THIS) AsmUtil.INLINE_DECLARATION_SITE_THIS else name
                     super.visitLocalVariable(varName + varSuffix, desc, signature, start, end, getNewIndex(index))
                 }
             }

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

@@ -111,6 +111,24 @@ class KotlinStackFrame(frame: StackFrameProxyImpl) : JavaStackFrame(StackFrameDe
             return true
         }
 
+        return removeCallSiteThisInInlineFunction(evaluationContext, children)
+    }
+
+    private fun removeCallSiteThisInInlineFunction(evaluationContext: EvaluationContextImpl, children: XValueChildrenList): Boolean {
+        val frameProxy = evaluationContext.frameProxy
+
+        val variables = frameProxy?.safeVisibleVariables() ?: return false
+        val inlineDepth = VariableFinder.getInlineDepth(variables)
+        val declarationSiteThis = variables.firstOrNull { v ->
+            val name = v.name()
+            name.endsWith(INLINE_FUN_VAR_SUFFIX) && name.dropInlineSuffix() == AsmUtil.INLINE_DECLARATION_SITE_THIS
+        }
+
+        if (inlineDepth > 0 && declarationSiteThis != null) {
+            ExistingInstanceThis.find(children)?.remove()
+            return true
+        }
+
         return false
     }
 

idea/idea-jvm/src/org/jetbrains/kotlin/idea/debugger/evaluate/variables/VariableFinder.kt

@@ -75,10 +75,7 @@ class VariableFinder(private val context: ExecutionContext) {
             return EvaluateExceptionUtil.createEvaluateException(message)
         }
 
-        // org.jetbrains.kotlin.codegen.inline.MethodInliner.prepareNode
-        private const val OUTER_THIS_FOR_INLINE = AsmUtil.THIS + '_'
-
-        val inlinedThisRegex = getLocalVariableNameRegexInlineAware(OUTER_THIS_FOR_INLINE)
+        val inlinedThisRegex = getLocalVariableNameRegexInlineAware(AsmUtil.INLINE_DECLARATION_SITE_THIS)
 
         private fun getCapturedVariableNameRegex(capturedName: String): Regex {
             val escapedName = Regex.escape(capturedName)

idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/frame/frameInlineFunCallInsideInlineFunKotlinVariables.out

@@ -7,8 +7,6 @@ frameInlineFunCallInsideInlineFunKotlinVariables.kt:8
 Compile bytecode for element
 Compile bytecode for this.prop
  frame    = bar:8, C {frameInlineFunCallInsideInlineFunKotlinVariables}
-   this     = this = {frameInlineFunCallInsideInlineFunKotlinVariables.C@uniqueID}
-              - Class has no fields
    local    = this: frameInlineFunCallInsideInlineFunKotlinVariables.A = {frameInlineFunCallInsideInlineFunKotlinVariables.A@uniqueID} (sp = null)
      field    = prop: int = 1 (sp = frameInlineFunCallInsideInlineFunKotlinVariables.kt, 11)
    local    = element: double = 1.0 (sp = frameInlineFunCallInsideInlineFunKotlinVariables.kt, 7)

idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/frame/inlineFunThisKotlinVariables.kt

@@ -0,0 +1,21 @@
+package inlineFunThisKotlinVariables
+
+class Same {
+    fun useInline() {
+        Different().inlineFun()
+    }
+}
+
+class Different {
+    inline fun inlineFun() {
+        //Breakpoint!
+        println(1)
+    }
+}
+
+fun main() {
+    Same().useInline()
+}
+
+// PRINT_FRAME
+// SHOW_KOTLIN_VARIABLES

idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/frame/inlineFunThisKotlinVariables.out

@@ -0,0 +1,11 @@
+LineBreakpoint created at inlineFunThisKotlinVariables.kt:12
+Run Java
+Connected to the target VM
+inlineFunThisKotlinVariables.kt:12
+ frame    = useInline:12, Same {inlineFunThisKotlinVariables}
+   local    = this: inlineFunThisKotlinVariables.Different = {inlineFunThisKotlinVariables.Different@uniqueID} (sp = null)
+              - Class has no fields
+Disconnected from the target VM
+
+Process finished with exit code 0
+1

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

@@ -800,6 +800,11 @@ public class KotlinEvaluateExpressionTestGenerated extends AbstractKotlinEvaluat
                 runTest("idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/frame/hideSyntheticThis.kt");
             }
 
+            @TestMetadata("inlineFunThisKotlinVariables.kt")
+            public void testInlineFunThisKotlinVariables() throws Exception {
+                runTest("idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/frame/inlineFunThisKotlinVariables.kt");
+            }
+
             @TestMetadata("lambdaFun1.kt")
             public void testLambdaFun1() throws Exception {
                 runTest("idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/frame/lambdaFun1.kt");