Fix duplicate field error on inlining several lambdas

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

@@ -449,14 +449,6 @@ public class AsmUtil {
         }
     }
 
-    public static List<FieldInfo> transformCapturedParams(List<Pair<String, Type>> allFields, Type owner) {
-        List<FieldInfo> result = new ArrayList<FieldInfo>();
-        for (Pair<String, Type> field : allFields) {
-            result.add(FieldInfo.createForHiddenField(owner, field.second, field.first));
-        }
-        return result;
-    }
-
     public static int genAssignInstanceFieldFromParam(FieldInfo info, int index, InstructionAdapter iv) {
         assert !info.isStatic();
         Type fieldType = info.getFieldType();

compiler/backend/src/org/jetbrains/kotlin/codegen/inline/AnonymousObjectTransformer.java

@@ -285,26 +285,23 @@ public class AnonymousObjectTransformer {
             }
         }
 
-        List<Pair<String, Type>> capturedFieldsToGenerate = new ArrayList<Pair<String, Type>>();
-        for (CapturedParamInfo capturedParamInfo : allCapturedBuilder.listCaptured()) {
-            if (capturedParamInfo.getLambda() == null) { //not inlined
-                capturedFieldsToGenerate.add(new Pair<String, Type>(capturedParamInfo.getNewFieldName(), capturedParamInfo.getType()));
-            }
-        }
-
         String constructorDescriptor = Type.getMethodDescriptor(Type.VOID_TYPE, descTypes.toArray(new Type[descTypes.size()]));
-
         MethodVisitor constructorVisitor = classBuilder.newMethod(NO_ORIGIN,
                                                                   AsmUtil.NO_FLAG_PACKAGE_PRIVATE,
                                                                   "<init>", constructorDescriptor,
                                                                   null, ArrayUtil.EMPTY_STRING_ARRAY);
 
         //initialize captured fields
-        List<FieldInfo> fields = AsmUtil.transformCapturedParams(capturedFieldsToGenerate, newLambdaType);
+        List<NewJavaField> newFieldsWithSkipped = TransformationUtilsKt.getNewFieldsToGenerate(allCapturedBuilder.listCaptured());
+        List<FieldInfo> fieldInfoWithSkipped = TransformationUtilsKt.transformToFieldInfo(newLambdaType, newFieldsWithSkipped);
+
         int paramIndex = 0;
         InstructionAdapter capturedFieldInitializer = new InstructionAdapter(constructorVisitor);
-        for (FieldInfo fieldInfo : fields) {
-            AsmUtil.genAssignInstanceFieldFromParam(fieldInfo, capturedIndexes[paramIndex], capturedFieldInitializer);
+        for (int i = 0; i < fieldInfoWithSkipped.size(); i++) {
+            FieldInfo fieldInfo = fieldInfoWithSkipped.get(i);
+            if (!newFieldsWithSkipped.get(i).getSkip()) {
+                AsmUtil.genAssignInstanceFieldFromParam(fieldInfo, capturedIndexes[paramIndex], capturedFieldInitializer);
+            }
             paramIndex++;
         }
 
@@ -328,8 +325,7 @@ public class AnonymousObjectTransformer {
 
         inlineMethodAndUpdateGlobalResult(anonymousObjectGen, parentRemapper, capturedFieldInitializer, constructor, constructorInlineBuilder, true);
         constructorVisitor.visitEnd();
-
-        AsmUtil.genClosureFields(capturedFieldsToGenerate, classBuilder);
+        AsmUtil.genClosureFields(TransformationUtilsKt.toNameTypePair(TransformationUtilsKt.filterSkipped(newFieldsWithSkipped)), classBuilder);
         //TODO for inline method make public class
         anonymousObjectGen.setNewConstructorDescriptor(constructorDescriptor);
     }
@@ -390,7 +386,7 @@ public class AnonymousObjectTransformer {
             }
         };
 
-        List<LambdaInfo> capturedLambdas = new ArrayList<LambdaInfo>(); //captured var of inlined parameter
+        Set<LambdaInfo> capturedLambdas = new LinkedHashSet<LambdaInfo>(); //captured var of inlined parameter
         List<CapturedParamInfo> constructorAdditionalFakeParams = new ArrayList<CapturedParamInfo>();
         Map<Integer, LambdaInfo> indexToLambda = anonymousObjectGen.getLambdasToInline();
         Set<Integer> capturedParams = new HashSet<Integer>();
@@ -459,10 +455,16 @@ public class AnonymousObjectTransformer {
         Map<String, LambdaInfo> capturedLambdasToInline = new HashMap<String, LambdaInfo>(); //captured var of inlined parameter
         List<CapturedParamDesc> allRecapturedParameters = new ArrayList<CapturedParamDesc>();
         boolean addCapturedNotAddOuter = parentFieldRemapper.isRoot() || (parentFieldRemapper instanceof InlinedLambdaRemapper && parentFieldRemapper.getParent().isRoot());
+        Map<String, CapturedParamInfo> alreadyAdded = new HashMap<String, CapturedParamInfo>();
         for (LambdaInfo info : capturedLambdas) {
             if (addCapturedNotAddOuter) {
                 for (CapturedParamDesc desc : info.getCapturedVars()) {
-                    CapturedParamInfo recapturedParamInfo = capturedParamBuilder.addCapturedParam(desc, getNewFieldName(desc.getFieldName(), false));
+                    String key = desc.getFieldName() + "$$$" + desc.getType().getClassName();
+                    CapturedParamInfo alreadyAddedParam = alreadyAdded.get(key);
+
+                    CapturedParamInfo recapturedParamInfo = capturedParamBuilder.addCapturedParam(
+                            desc,
+                            alreadyAddedParam != null ? alreadyAddedParam.getNewFieldName() : getNewFieldName(desc.getFieldName(), false));
                     StackValue composed = StackValue.field(desc.getType(),
                                                            oldObjectType, /*TODO owner type*/
                                                            recapturedParamInfo.getNewFieldName(),
@@ -472,6 +474,13 @@ public class AnonymousObjectTransformer {
                     allRecapturedParameters.add(desc);
 
                     constructorParamBuilder.addCapturedParam(recapturedParamInfo, recapturedParamInfo.getNewFieldName()).setRemapValue(composed);
+                    if (alreadyAddedParam != null) {
+                        recapturedParamInfo.setSkipInConstructor(true);
+                    }
+
+                    if (isThis0(desc.getFieldName())) {
+                        alreadyAdded.put(key, recapturedParamInfo);
+                    }
                 }
             }
             capturedLambdasToInline.put(info.getLambdaClassType().getInternalName(), info);

compiler/backend/src/org/jetbrains/kotlin/codegen/inline/CapturedParamInfo.java

@@ -33,6 +33,8 @@ public class CapturedParamInfo extends ParameterInfo {
 
     private final String newFieldName;
 
+    private boolean skipInConstructor;
+
     public CapturedParamInfo(@NotNull CapturedParamDesc desc, boolean skipped, int index, int remapIndex) {
         this(desc, desc.getFieldName(), skipped, index, remapIndex);
     }
@@ -68,6 +70,7 @@ public class CapturedParamInfo extends ParameterInfo {
     public CapturedParamInfo clone(int newIndex, StackValue newRamapIndex) {
         CapturedParamInfo capturedParamInfo = new CapturedParamInfo(desc, newFieldName, isSkipped, newIndex, newRamapIndex);
         capturedParamInfo.setLambda(lambda);
+        capturedParamInfo.setSkipInConstructor(skipInConstructor);
         return capturedParamInfo;
     }
 
@@ -75,4 +78,12 @@ public class CapturedParamInfo extends ParameterInfo {
     public String getContainingLambdaName() {
         return desc.getContainingLambdaName();
     }
+
+    public boolean isSkipInConstructor() {
+        return skipInConstructor;
+    }
+
+    public void setSkipInConstructor(boolean skipInConstructor) {
+        this.skipInConstructor = skipInConstructor;
+    }
 }

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

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.codegen.inline
+
+import com.intellij.openapi.util.Pair
+import org.jetbrains.kotlin.codegen.FieldInfo
+import org.jetbrains.org.objectweb.asm.Type
+
+class NewJavaField(val name: String, val type: Type, val skip: Boolean)
+
+fun getNewFieldsToGenerate(params: List<CapturedParamInfo>): List<NewJavaField> {
+    return params.filter {
+        //not inlined
+        it.lambda == null
+    }.map {
+        NewJavaField(it.newFieldName, it.type, it.isSkipInConstructor)
+    }
+}
+
+fun transformToFieldInfo(lambdaType: Type, newFields: List<NewJavaField>): List<FieldInfo> {
+    return newFields.map { field ->
+        FieldInfo.createForHiddenField(lambdaType, field.type, field.name)
+    }
+}
+
+fun filterSkipped(fields: List<NewJavaField>): List<NewJavaField> {
+    return fields.filter { !it.skip }
+}
+
+fun toNameTypePair(fields: List<NewJavaField>): List<Pair<String, Type>> = fields.map { Pair(it.name, it.type) }