working on REPL: implemented previous lines importing

compiler/backend/src/org/jetbrains/jet/codegen/CodegenContext.java

@@ -134,7 +134,7 @@ public abstract class CodegenContext {
     }
 
     public CodegenContext intoScript(@NotNull ScriptDescriptor script, @NotNull ClassDescriptor classDescriptor) {
-        return new CodegenContexts.ScriptContext(classDescriptor, OwnerKind.IMPLEMENTATION, this, closure);
+        return new CodegenContexts.ScriptContext(script, classDescriptor, OwnerKind.IMPLEMENTATION, this, closure);
     }
 
     public CodegenContexts.ClosureContext intoClosure(FunctionDescriptor funDescriptor, ClassDescriptor classDescriptor, JvmClassName internalClassName, ClosureCodegen closureCodegen, JetTypeMapper typeMapper) {

compiler/backend/src/org/jetbrains/jet/codegen/CodegenContexts.java

@@ -26,6 +26,7 @@ import org.jetbrains.jet.lang.descriptors.DeclarationDescriptorVisitor;
 import org.jetbrains.jet.lang.descriptors.FunctionDescriptor;
 import org.jetbrains.jet.lang.descriptors.NamespaceDescriptor;
 import org.jetbrains.jet.lang.descriptors.PropertyAccessorDescriptor;
+import org.jetbrains.jet.lang.descriptors.ScriptDescriptor;
 import org.jetbrains.jet.lang.descriptors.annotations.AnnotationDescriptor;
 import org.jetbrains.jet.lang.resolve.java.JvmClassName;
 import org.jetbrains.jet.lang.resolve.name.Name;
@@ -111,8 +112,17 @@ public class CodegenContexts {
     }
 
     public static class MethodContext  extends ReceiverContext {
-        public MethodContext(FunctionDescriptor contextType, OwnerKind contextKind, CodegenContext parentContext) {
+        @NotNull
+        private final FunctionDescriptor functionDescriptor;
+
+        public MethodContext(@NotNull FunctionDescriptor contextType, OwnerKind contextKind, CodegenContext parentContext) {
             super(contextType instanceof PropertyAccessorDescriptor ? ((PropertyAccessorDescriptor)contextType).getCorrespondingProperty() : contextType, contextKind, parentContext, null);
+            this.functionDescriptor = contextType;
+        }
+
+        @NotNull
+        public FunctionDescriptor getFunctionDescriptor() {
+            return functionDescriptor;
         }
 
         @Override
@@ -167,8 +177,11 @@ public class CodegenContexts {
 
         @NotNull
         private final ClassDescriptor classDescriptor;
+        @NotNull
+        private final ScriptDescriptor scriptDescriptor;
 
         public ScriptContext(
+                @NotNull ScriptDescriptor scriptDescriptor,
                 @NotNull ClassDescriptor contextDescriptor,
                 @NotNull OwnerKind contextKind,
                 @Nullable CodegenContext parentContext,
@@ -176,6 +189,7 @@ public class CodegenContexts {
             super(contextDescriptor, contextKind, parentContext, closureCodegen);
 
             this.classDescriptor = contextDescriptor;
+            this.scriptDescriptor = scriptDescriptor;
         }
 
         @Override
@@ -183,6 +197,11 @@ public class CodegenContexts {
             return classDescriptor;
         }
 
+        @NotNull
+        public ScriptDescriptor getScriptDescriptor() {
+            return scriptDescriptor;
+        }
+
         @Override
         public boolean isStatic() {
             return true;

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

@@ -22,6 +22,7 @@ import com.intellij.openapi.progress.ProcessCanceledException;
 import com.intellij.psi.PsiElement;
 import com.intellij.psi.PsiMethod;
 import com.intellij.psi.tree.IElementType;
+import com.sun.tools.internal.ws.wsdl.document.schema.SchemaConstants;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.jet.codegen.intrinsics.IntrinsicMethod;
@@ -1469,10 +1470,7 @@ public class ExpressionCodegen extends JetVisitor<StackValue, StackValue> {
                 StackValue.onStack(exprType).put(type, v);
         }
         else if (descriptor instanceof ScriptReceiver) {
-            ScriptReceiver scriptReceiver = (ScriptReceiver) descriptor;
-            ScriptDescriptor script = (ScriptDescriptor) scriptReceiver.getDeclarationDescriptor();
-            ClassDescriptor classDescriptorForScript = state.getInjector().getClosureAnnotator().classDescriptorForScrpitDescriptor(script);
-            generateThisOrOuter(classDescriptorForScript);
+            generateScript((ScriptReceiver) descriptor);
         }
         else if(descriptor instanceof ExtensionReceiver) {
             Type exprType = asmType(descriptor.getType());
@@ -1520,6 +1518,44 @@ public class ExpressionCodegen extends JetVisitor<StackValue, StackValue> {
         return castToRequiredTypeOfInterfaceIfNeeded(result, provided, null);
     }
 
+    private void generateScript(@NotNull ScriptReceiver receiver) {
+        CodegenContext cur = context;
+
+        //PsiElement psiElement = BindingContextUtils.classDescriptorToDeclaration(bindingContext, calleeContainingClass);
+        //boolean isObject = psiElement instanceof JetClassOrObject && CodegenUtil.isNonLiteralObject((JetClassOrObject) psiElement);
+
+        cur = context;
+        StackValue result = StackValue.local(0, TYPE_OBJECT);
+        while (cur != null) {
+            if(cur instanceof CodegenContexts.MethodContext && !(cur instanceof CodegenContexts.ConstructorContext))
+                cur = cur.getParentContext();
+
+            if (cur instanceof CodegenContexts.ScriptContext) {
+                CodegenContexts.ScriptContext scriptContext = (CodegenContexts.ScriptContext) cur;
+
+                JvmClassName currentScriptClassName = state.getInjector().getClosureAnnotator().classNameForScriptDescriptor(scriptContext.getScriptDescriptor());
+                if (scriptContext.getScriptDescriptor() == receiver.getDeclarationDescriptor()) {
+                    result.put(currentScriptClassName.getAsmType(), v);
+                }
+                else {
+                    JvmClassName className = state.getInjector().getClosureAnnotator().classNameForScriptDescriptor(receiver.getDeclarationDescriptor());
+                    String fieldName = state.getInjector().getScriptCodegen().getScriptFieldName(receiver.getDeclarationDescriptor());
+                    result.put(currentScriptClassName.getAsmType(), v);
+                    StackValue.field(className.getAsmType(), currentScriptClassName, fieldName, false).put(className.getAsmType(), v);
+                }
+                return;
+            }
+
+            result = cur.getOuterExpression(result);
+
+            if(cur instanceof CodegenContexts.ConstructorContext) {
+                cur = cur.getParentContext();
+            }
+            cur = cur.getParentContext();
+        }
+
+        throw new UnsupportedOperationException();    }
+
     public StackValue generateThisOrOuter(ClassDescriptor calleeContainingClass) {
         CodegenContext cur = context;
 

compiler/backend/src/org/jetbrains/jet/codegen/GenerationState.java

@@ -30,6 +30,7 @@ import org.jetbrains.jet.analyzer.AnalyzeExhaust;
 import org.jetbrains.jet.di.InjectorForJvmCodegen;
 import org.jetbrains.jet.lang.descriptors.ClassDescriptor;
 import org.jetbrains.jet.lang.descriptors.ConstructorDescriptor;
+import org.jetbrains.jet.lang.descriptors.ScriptDescriptor;
 import org.jetbrains.jet.lang.diagnostics.DiagnosticUtils;
 import org.jetbrains.jet.lang.psi.*;
 import org.jetbrains.jet.lang.resolve.BindingContext;
@@ -40,6 +41,7 @@ import org.jetbrains.jet.utils.Progress;
 import org.objectweb.asm.commons.Method;
 
 import java.util.Collection;
+import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 
@@ -145,6 +147,8 @@ public class GenerationState {
             }
         }
 
+        injector.getScriptCodegen().registerEarlierScripts(Collections.<Pair<ScriptDescriptor, JvmClassName>>emptyList());
+
         MultiMap<FqName, JetFile> namespaceGrouping = new MultiMap<FqName, JetFile>();
         for (JetFile file : this.files) {
             if (file == null) throw new IllegalArgumentException("A null file given for compilation");
@@ -156,6 +160,24 @@ public class GenerationState {
         }
     }
 
+    public void compileScript(
+            @NotNull JetScript script,
+            @NotNull JvmClassName className,
+            @NotNull List<Pair<ScriptDescriptor, JvmClassName>> earlierScripts,
+            @NotNull CompilationErrorHandler errorHandler) {
+        poison();
+
+        injector.getScriptCodegen().registerEarlierScripts(earlierScripts);
+
+        injector.getClosureAnnotator().registerClassNameForScript(script, className);
+
+        generateNamespace(
+                JetPsiUtil.getFQName((JetFile) script.getContainingFile()),
+                Collections.singleton((JetFile) script.getContainingFile()),
+                errorHandler,
+                progress);
+    }
+
     protected void generateNamespace(FqName fqName, Collection<JetFile> namespace, CompilationErrorHandler errorHandler, Progress progress) {
         NamespaceCodegen codegen = forNamespace(fqName, namespace);
         codegen.generate(errorHandler, progress);

compiler/backend/src/org/jetbrains/jet/codegen/JetTypeMapper.java

@@ -899,13 +899,19 @@ public class JetTypeMapper {
     }
 
     @NotNull
-    public JvmMethodSignature mapScriptSignature(@NotNull ScriptDescriptor script) {
+    public JvmMethodSignature mapScriptSignature(@NotNull ScriptDescriptor script, @NotNull List<ScriptDescriptor> importedScripts) {
         BothSignatureWriter signatureWriter = new BothSignatureWriter(BothSignatureWriter.Mode.METHOD, false);
 
         writeFormalTypeParameters(Collections.<TypeParameterDescriptor>emptyList(), signatureWriter);
 
         signatureWriter.writeParametersStart();
 
+        for (ScriptDescriptor importedScript : importedScripts) {
+            signatureWriter.writeParameterType(JvmMethodParameterKind.VALUE);
+            mapType(closureAnnotator.classDescriptorForScrpitDescriptor(importedScript).getDefaultType(), signatureWriter, MapTypeMode.VALUE);
+            signatureWriter.writeParameterTypeEnd();
+        }
+
         for (ValueParameterDescriptor valueParameter : script.getValueParameters()) {
             signatureWriter.writeParameterType(JvmMethodParameterKind.VALUE);
             mapType(valueParameter.getType(), signatureWriter, MapTypeMode.VALUE);

compiler/backend/src/org/jetbrains/jet/codegen/ScriptCodegen.java

@@ -16,6 +16,8 @@
 
 package org.jetbrains.jet.codegen;
 
+import com.google.common.collect.Lists;
+import com.intellij.openapi.util.Pair;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.jet.codegen.signature.JvmMethodSignature;
 import org.jetbrains.jet.lang.descriptors.ClassDescriptor;
@@ -33,6 +35,8 @@ import org.objectweb.asm.Type;
 import org.objectweb.asm.commons.InstructionAdapter;
 
 import javax.inject.Inject;
+import java.util.Collections;
+import java.util.List;
 
 /**
  * @author Stepan Koltsov
@@ -56,6 +60,8 @@ public class ScriptCodegen {
     @NotNull
     private BindingContext bindingContext;
 
+    private List<ScriptDescriptor> earlierScripts;
+
 
     @Inject
     public void setState(@NotNull GenerationState state) {
@@ -110,7 +116,8 @@ public class ScriptCodegen {
 
         genMembers(scriptDeclaration, context, classBuilder);
         genFieldsForParameters(scriptDescriptor, classBuilder);
-        genConstructor(scriptDeclaration, scriptDescriptor, classDescriptorForScript, classBuilder, context.intoFunction(scriptDescriptor.getScriptCodeDescriptor()));
+        genConstructor(scriptDeclaration, scriptDescriptor, classDescriptorForScript, classBuilder,
+                context.intoFunction(scriptDescriptor.getScriptCodeDescriptor()), earlierScripts);
 
         classBuilder.done();
     }
@@ -119,13 +126,15 @@ public class ScriptCodegen {
             @NotNull JetScript scriptDeclaration,
             @NotNull ScriptDescriptor scriptDescriptor,
             @NotNull ClassDescriptor classDescriptorForScript,
-            @NotNull ClassBuilder classBuilder, @NotNull CodegenContext context) {
+            @NotNull ClassBuilder classBuilder,
+            @NotNull CodegenContext context,
+            @NotNull List<ScriptDescriptor> importedScripts) {
 
         Type blockType = jetTypeMapper.mapType(scriptDescriptor.getReturnType(), MapTypeMode.VALUE);
 
         classBuilder.newField(null, Opcodes.ACC_PUBLIC, LAST_EXPRESSION_VALUE_FIELD_NAME, blockType.getDescriptor(), null, null);
 
-        JvmMethodSignature jvmSignature = jetTypeMapper.mapScriptSignature(scriptDescriptor);
+        JvmMethodSignature jvmSignature = jetTypeMapper.mapScriptSignature(scriptDescriptor, importedScripts);
 
         state.setScriptConstructorMethod(jvmSignature.getAsmMethod());
 
@@ -145,6 +154,10 @@ public class ScriptCodegen {
 
         FrameMap frameMap = context.prepareFrame(jetTypeMapper);
 
+        for (ScriptDescriptor importedScript : importedScripts) {
+            frameMap.enter(importedScript, 1);
+        }
+
         Type[] argTypes = jvmSignature.getAsmMethod().getArgumentTypes();
         int add = 0;
 
@@ -161,6 +174,15 @@ public class ScriptCodegen {
                 jetTypeMapper);
 
         int offset = 1;
+
+        for (ScriptDescriptor earlierScript : importedScripts) {
+            JvmClassName earlierClassName = closureAnnotator.classNameForScriptDescriptor(earlierScript);
+            instructionAdapter.load(0, className.getAsmType());
+            instructionAdapter.load(offset, earlierClassName.getAsmType());
+            offset += earlierClassName.getAsmType().getSize();
+            instructionAdapter.putfield(className.getInternalName(), getScriptFieldName(earlierScript), earlierClassName.getAsmType().getDescriptor());
+        }
+
         for (ValueParameterDescriptor parameter : scriptDescriptor.getValueParameters()) {
             Type parameterType = jetTypeMapper.mapType(parameter.getType(), MapTypeMode.VALUE);
             instructionAdapter.load(0, className.getAsmType());
@@ -181,6 +203,12 @@ public class ScriptCodegen {
     }
 
     private void genFieldsForParameters(@NotNull ScriptDescriptor script, @NotNull ClassBuilder classBuilder) {
+        for (ScriptDescriptor earlierScript : earlierScripts) {
+            JvmClassName earlierClassName = closureAnnotator.classNameForScriptDescriptor(earlierScript);
+            int access = Opcodes.ACC_PRIVATE | Opcodes.ACC_FINAL;
+            classBuilder.newField(null, access, getScriptFieldName(earlierScript), earlierClassName.getDescriptor(), null, null);
+        }
+
         for (ValueParameterDescriptor parameter : script.getValueParameters()) {
             Type parameterType = jetTypeMapper.mapType(parameter.getType(), MapTypeMode.VALUE);
             int access = Opcodes.ACC_PRIVATE | Opcodes.ACC_FINAL;
@@ -193,4 +221,33 @@ public class ScriptCodegen {
             memberCodegen.generateFunctionOrProperty((JetTypeParameterListOwner) decl, context, classBuilder);
         }
     }
+
+    public void registerEarlierScripts(List<Pair<ScriptDescriptor, JvmClassName>> earlierScripts) {
+        for (Pair<ScriptDescriptor, JvmClassName> t : earlierScripts) {
+            ScriptDescriptor earlierDescriptor = t.first;
+            JvmClassName earlierClassName = t.second;
+
+            closureAnnotator.registerClassNameForScript(earlierDescriptor, earlierClassName);
+        }
+
+        List<ScriptDescriptor> earlierScriptDescriptors = Lists.newArrayList();
+        for (Pair<ScriptDescriptor, JvmClassName> t : earlierScripts) {
+            ScriptDescriptor earlierDescriptor = t.first;
+            JvmClassName earlierClassName = t.second;
+            earlierScriptDescriptors.add(earlierDescriptor);
+        }
+        this.earlierScripts = earlierScriptDescriptors;
+    }
+
+    public int getScriptIndex(@NotNull ScriptDescriptor scriptDescriptor) {
+        int index = earlierScripts.indexOf(scriptDescriptor);
+        if (index < 0) {
+            throw new IllegalStateException("Unregistered script: " + scriptDescriptor);
+        }
+        return index + 1;
+    }
+
+    public String getScriptFieldName(@NotNull ScriptDescriptor scriptDescriptor) {
+        return "script$" + getScriptIndex(scriptDescriptor);
+    }
 }

compiler/cli/src/org/jetbrains/jet/cli/jvm/repl/EarlierLine.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright 2010-2012 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.jet.cli.jvm.repl;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.jet.lang.descriptors.ScriptDescriptor;
+import org.jetbrains.jet.lang.resolve.java.JvmClassName;
+
+/**
+ * @author Stepan Koltsov
+ */
+public class EarlierLine {
+    @NotNull
+    private final String code;
+    @NotNull
+    private final ScriptDescriptor scriptDescriptor;
+    @NotNull
+    private final Class<?> scriptClass;
+    @NotNull
+    private final Object scriptInstance;
+    @NotNull
+    private final JvmClassName className;
+
+    public EarlierLine(@NotNull String code, @NotNull ScriptDescriptor scriptDescriptor, @NotNull Class<?> scriptClass, @NotNull Object scriptInstance, @NotNull JvmClassName className) {
+        this.code = code;
+        this.scriptDescriptor = scriptDescriptor;
+        this.scriptClass = scriptClass;
+        this.scriptInstance = scriptInstance;
+        this.className = className;
+    }
+
+    @NotNull
+    public String getCode() {
+        return code;
+    }
+
+    @NotNull
+    public ScriptDescriptor getScriptDescriptor() {
+        return scriptDescriptor;
+    }
+
+    @NotNull
+    public Class<?> getScriptClass() {
+        return scriptClass;
+    }
+
+    @NotNull
+    public Object getScriptInstance() {
+        return scriptInstance;
+    }
+
+    @NotNull
+    public JvmClassName getClassName() {
+        return className;
+    }
+}

compiler/cli/src/org/jetbrains/jet/cli/jvm/repl/ReplClassLoader.java

@@ -0,0 +1,59 @@
+/*
+ * Copyright 2010-2012 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.jet.cli.jvm.repl;
+
+import com.google.common.collect.Maps;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.jet.lang.resolve.java.JvmClassName;
+import org.objectweb.asm.ClassReader;
+import org.objectweb.asm.util.TraceClassVisitor;
+
+import java.io.PrintWriter;
+import java.util.Map;
+
+/**
+ * @author Stepan Koltsov
+ */
+public class ReplClassLoader extends ClassLoader {
+
+    private Map<JvmClassName, byte[]> classes = Maps.newLinkedHashMap();
+
+    @Override
+    protected Class<?> findClass(String name) throws ClassNotFoundException {
+        byte[] classBytes = classes.get(JvmClassName.byFqNameWithoutInnerClasses(name));
+        if (classBytes != null) {
+            return defineClass(name, classBytes, 0, classBytes.length);
+        }
+        else {
+            return super.findClass(name);
+        }
+    }
+
+    public void addClass(@NotNull JvmClassName className, @NotNull byte[] bytes) {
+        byte[] oldBytes = classes.put(className, bytes);
+        if (oldBytes != null) {
+            throw new IllegalStateException("Rewrite at key " + className);
+        }
+    }
+
+    public void dumpClasses(@NotNull PrintWriter writer) {
+        for (byte[] classBytes : classes.values()) {
+            new ClassReader(classBytes).accept(new TraceClassVisitor(writer), 0);
+        }
+    }
+
+}

compiler/cli/src/org/jetbrains/jet/cli/jvm/repl/ReplInterpreter.java

@@ -17,44 +17,52 @@
 package org.jetbrains.jet.cli.jvm.repl;
 
 import com.google.common.base.Predicates;
+import com.google.common.collect.Lists;
 import com.intellij.openapi.Disposable;
 import com.intellij.openapi.project.Project;
-import com.intellij.openapi.util.Disposer;
+import com.intellij.openapi.util.Pair;
 import com.intellij.openapi.vfs.CharsetToolkit;
 import com.intellij.psi.PsiFile;
 import com.intellij.psi.PsiFileFactory;
 import com.intellij.psi.impl.PsiFileFactoryImpl;
 import com.intellij.testFramework.LightVirtualFile;
-import com.intellij.util.ExceptionUtil;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 import org.jetbrains.jet.analyzer.AnalyzeExhaust;
-import org.jetbrains.jet.cli.common.messages.CompilerMessageLocation;
-import org.jetbrains.jet.cli.common.messages.CompilerMessageSeverity;
 import org.jetbrains.jet.cli.jvm.compiler.JetCoreEnvironment;
 import org.jetbrains.jet.codegen.ClassBuilderFactories;
 import org.jetbrains.jet.codegen.CompilationErrorHandler;
-import org.jetbrains.jet.codegen.GeneratedClassLoader;
 import org.jetbrains.jet.codegen.GenerationState;
-import org.jetbrains.jet.codegen.ScriptCodegen;
 import org.jetbrains.jet.di.InjectorForTopDownAnalyzerForJvm;
 import org.jetbrains.jet.lang.descriptors.ModuleDescriptor;
+import org.jetbrains.jet.lang.descriptors.NamespaceDescriptorImpl;
+import org.jetbrains.jet.lang.descriptors.NamespaceLikeBuilderDummy;
+import org.jetbrains.jet.lang.descriptors.ScriptDescriptor;
 import org.jetbrains.jet.lang.psi.JetFile;
 import org.jetbrains.jet.lang.resolve.AnalyzerScriptParameter;
 import org.jetbrains.jet.lang.resolve.AnalyzingUtils;
-import org.jetbrains.jet.lang.resolve.BindingTrace;
+import org.jetbrains.jet.lang.resolve.BindingContext;
 import org.jetbrains.jet.lang.resolve.BindingTraceContext;
 import org.jetbrains.jet.lang.resolve.TopDownAnalysisParameters;
-import org.jetbrains.jet.lang.resolve.TopDownAnalyzer;
+import org.jetbrains.jet.lang.resolve.TraceBasedRedeclarationHandler;
 import org.jetbrains.jet.lang.resolve.java.CompilerDependencies;
+import org.jetbrains.jet.lang.resolve.java.JvmClassName;
+import org.jetbrains.jet.lang.resolve.name.FqName;
 import org.jetbrains.jet.lang.resolve.name.Name;
+import org.jetbrains.jet.lang.resolve.scopes.JetScope;
+import org.jetbrains.jet.lang.resolve.scopes.WritableScope;
+import org.jetbrains.jet.lang.resolve.scopes.WritableScopeImpl;
+import org.jetbrains.jet.lang.types.lang.JetStandardClasses;
 import org.jetbrains.jet.lang.types.lang.JetStandardLibrary;
 import org.jetbrains.jet.plugin.JetLanguage;
 import org.jetbrains.jet.utils.ExceptionUtils;
 import org.jetbrains.jet.utils.Progress;
 
+import java.io.PrintWriter;
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Field;
 import java.util.Collections;
+import java.util.List;
 
 /**
  * @author Stepan Koltsov
@@ -62,6 +70,10 @@ import java.util.Collections;
 public class ReplInterpreter {
 
     private int lineNumber = 0;
+    @Nullable
+    private JetScope lastLineScope;
+    private List<EarlierLine> earlierLines = Lists.newArrayList();
+    private final ReplClassLoader classLoader = new ReplClassLoader();
 
     @NotNull
     private final InjectorForTopDownAnalyzerForJvm injector;
@@ -69,12 +81,14 @@ public class ReplInterpreter {
     private final JetCoreEnvironment jetCoreEnvironment;
     @NotNull
     private final BindingTraceContext trace;
+    @NotNull
+    private final ModuleDescriptor module;
 
     public ReplInterpreter(@NotNull Disposable disposable, @NotNull CompilerDependencies compilerDependencies) {
         jetCoreEnvironment = new JetCoreEnvironment(disposable, compilerDependencies);
         Project project = jetCoreEnvironment.getProject();
         trace = new BindingTraceContext();
-        ModuleDescriptor module = new ModuleDescriptor(Name.special("<repl>"));
+        module = new ModuleDescriptor(Name.special("<repl>"));
         TopDownAnalysisParameters topDownAnalysisParameters = new TopDownAnalysisParameters(
                 Predicates.<PsiFile>alwaysTrue(),
                 false,
@@ -86,6 +100,8 @@ public class ReplInterpreter {
     public Object eval(@NotNull String line) {
         ++lineNumber;
 
+        JvmClassName scriptClassName = JvmClassName.byInternalName("Line" + lineNumber);
+
         LightVirtualFile virtualFile = new LightVirtualFile("line" + lineNumber + ".ktscript", JetLanguage.INSTANCE, line);
         virtualFile.setCharset(CharsetToolkit.UTF8_CHARSET);
         JetFile psiFile = (JetFile) ((PsiFileFactoryImpl) PsiFileFactory.getInstance(jetCoreEnvironment.getProject())).trySetupPsiForFile(virtualFile, JetLanguage.INSTANCE, true, false);
@@ -94,9 +110,7 @@ public class ReplInterpreter {
 
         injector.getTopDownAnalyzer().prepareForTheNextReplLine();
 
-        injector.getTopDownAnalyzer().analyzeFiles(Collections.singletonList(psiFile), Collections.<AnalyzerScriptParameter>emptyList());
-
-        AnalyzingUtils.throwExceptionOnErrors(trace.getBindingContext());
+        ScriptDescriptor scriptDescriptor = doAnalyze(psiFile);
 
         Progress backendProgress = new Progress() {
             @Override
@@ -104,22 +118,85 @@ public class ReplInterpreter {
             }
         };
 
+        List<Pair<ScriptDescriptor, JvmClassName>> earierScripts = Lists.newArrayList();
+
+        for (EarlierLine earlierLine : earlierLines) {
+            earierScripts.add(Pair.create(earlierLine.getScriptDescriptor(), earlierLine.getClassName()));
+        }
+
         GenerationState generationState = new GenerationState(jetCoreEnvironment.getProject(), ClassBuilderFactories.binaries(false), backendProgress,
                 AnalyzeExhaust.success(trace.getBindingContext(), JetStandardLibrary.getInstance()), Collections.singletonList(psiFile),
                 jetCoreEnvironment.getCompilerDependencies().getCompilerSpecialMode());
-        generationState.compileCorrectFiles(CompilationErrorHandler.THROW_EXCEPTION);
+        generationState.compileScript(psiFile.getScript(), scriptClassName, earierScripts, CompilationErrorHandler.THROW_EXCEPTION);
+
+        for (String file : generationState.getFactory().files()) {
+            classLoader.addClass(JvmClassName.byInternalName(file.replaceFirst("\\.class$", "")), generationState.getFactory().asBytes(file));
+        }
 
         try {
-            Class<?> scriptClass = new GeneratedClassLoader(generationState.getFactory()).loadClass(ScriptCodegen.SCRIPT_DEFAULT_CLASS_NAME.getFqName().getFqName());
-            Constructor<?> scriptInstanceConstructor = scriptClass.getConstructor(new Class<?>[0]);
-            Object scriptInstance = scriptInstanceConstructor.newInstance(new Object[0]);
+            Class<?> scriptClass = classLoader.loadClass(scriptClassName.getFqName().getFqName());
+
+            Class<?>[] constructorParams = new Class<?>[earlierLines.size()];
+            Object[] constructorArgs = new Object[earlierLines.size()];
+
+            for (int i = 0; i < earlierLines.size(); ++i) {
+                constructorParams[i] = earlierLines.get(i).getScriptClass();
+                constructorArgs[i] = earlierLines.get(i).getScriptInstance();
+            }
+
+            Constructor<?> scriptInstanceConstructor = scriptClass.getConstructor(constructorParams);
+            Object scriptInstance = scriptInstanceConstructor.newInstance(constructorArgs);
             Field rvField = scriptClass.getDeclaredField("rv");
             rvField.setAccessible(true);
             Object rv = rvField.get(scriptInstance);
+
+            earlierLines.add(new EarlierLine(line, scriptDescriptor, scriptClass, scriptInstance, scriptClassName));
+
             return rv;
-        } catch (Exception e) {
+        } catch (Throwable e) {
+            PrintWriter writer = new PrintWriter(System.err);
+            classLoader.dumpClasses(writer);
+            writer.flush();
             throw ExceptionUtils.rethrow(e);
         }
     }
 
+    private ScriptDescriptor doAnalyze(@NotNull JetFile psiFile) {
+        final WritableScope scope = new WritableScopeImpl(
+                JetScope.EMPTY, module,
+                new TraceBasedRedeclarationHandler(trace), "Root scope in analyzeNamespace");
+
+        scope.changeLockLevel(WritableScope.LockLevel.BOTH);
+
+        NamespaceDescriptorImpl rootNs = injector.getNamespaceFactory().createNamespaceDescriptorPathIfNeeded(FqName.ROOT);
+
+        // map "jet" namespace into JetStandardLibrary/Classes
+        // @see DefaultModuleConfiguraiton#extendNamespaceScope
+        injector.getNamespaceFactory().createNamespaceDescriptorPathIfNeeded(JetStandardClasses.STANDARD_CLASSES_FQNAME);
+
+        // Import a scope that contains all top-level namespaces that come from dependencies
+        // This makes the namespaces visible at all, does not import themselves
+        scope.importScope(rootNs.getMemberScope());
+
+        if (lastLineScope != null) {
+            scope.importScope(lastLineScope);
+        }
+
+        scope.changeLockLevel(WritableScope.LockLevel.READING);
+
+        // dummy builder is used because "root" is module descriptor,
+        // namespaces added to module explicitly in
+        injector.getTopDownAnalyzer().doProcess(scope, new NamespaceLikeBuilderDummy(), Collections.singletonList(psiFile));
+
+        // TODO: print, not throw
+        AnalyzingUtils.throwExceptionOnErrors(trace.getBindingContext());
+
+        ScriptDescriptor scriptDescriptor = injector.getTopDownAnalysisContext().getScripts().get(psiFile.getScript());
+        lastLineScope = trace.get(BindingContext.SCRIPT_SCOPE, scriptDescriptor);
+        if (lastLineScope == null) {
+            throw new IllegalStateException("last line scope is not initialized");
+        }
+
+        return scriptDescriptor;
+    }
 }

compiler/frontend.java/src/org/jetbrains/jet/di/InjectorForTopDownAnalyzerForJvm.java

@@ -32,6 +32,7 @@ import org.jetbrains.jet.lang.resolve.java.CompilerSpecialMode;
 import org.jetbrains.jet.lang.resolve.java.JavaBridgeConfiguration;
 import org.jetbrains.jet.lang.resolve.java.JavaDescriptorResolver;
 import org.jetbrains.jet.lang.resolve.java.PsiClassFinderForJvm;
+import org.jetbrains.jet.lang.resolve.NamespaceFactoryImpl;
 import org.jetbrains.jet.lang.resolve.DeclarationResolver;
 import org.jetbrains.jet.lang.resolve.AnnotationResolver;
 import org.jetbrains.jet.lang.resolve.calls.CallResolver;
@@ -41,7 +42,6 @@ import org.jetbrains.jet.lang.resolve.QualifiedExpressionResolver;
 import org.jetbrains.jet.lang.resolve.calls.OverloadingConflictResolver;
 import org.jetbrains.jet.lang.resolve.ImportsResolver;
 import org.jetbrains.jet.lang.resolve.DelegationResolver;
-import org.jetbrains.jet.lang.resolve.NamespaceFactoryImpl;
 import org.jetbrains.jet.lang.resolve.OverloadResolver;
 import org.jetbrains.jet.lang.resolve.OverrideResolver;
 import org.jetbrains.jet.lang.resolve.TypeHierarchyResolver;
@@ -74,6 +74,7 @@ public class InjectorForTopDownAnalyzerForJvm {
     private JavaBridgeConfiguration javaBridgeConfiguration;
     private JavaDescriptorResolver javaDescriptorResolver;
     private PsiClassFinderForJvm psiClassFinderForJvm;
+    private NamespaceFactoryImpl namespaceFactory;
     private DeclarationResolver declarationResolver;
     private AnnotationResolver annotationResolver;
     private CallResolver callResolver;
@@ -83,7 +84,6 @@ public class InjectorForTopDownAnalyzerForJvm {
     private OverloadingConflictResolver overloadingConflictResolver;
     private ImportsResolver importsResolver;
     private DelegationResolver delegationResolver;
-    private NamespaceFactoryImpl namespaceFactory;
     private OverloadResolver overloadResolver;
     private OverrideResolver overrideResolver;
     private TypeHierarchyResolver typeHierarchyResolver;
@@ -113,6 +113,7 @@ public class InjectorForTopDownAnalyzerForJvm {
         this.javaBridgeConfiguration = new JavaBridgeConfiguration();
         this.javaDescriptorResolver = new JavaDescriptorResolver();
         this.psiClassFinderForJvm = new PsiClassFinderForJvm();
+        this.namespaceFactory = new NamespaceFactoryImpl();
         this.declarationResolver = new DeclarationResolver();
         this.annotationResolver = new AnnotationResolver();
         this.callResolver = new CallResolver();
@@ -122,7 +123,6 @@ public class InjectorForTopDownAnalyzerForJvm {
         this.overloadingConflictResolver = new OverloadingConflictResolver();
         this.importsResolver = new ImportsResolver();
         this.delegationResolver = new DelegationResolver();
-        this.namespaceFactory = new NamespaceFactoryImpl();
         this.overloadResolver = new OverloadResolver();
         this.overrideResolver = new OverrideResolver();
         this.typeHierarchyResolver = new TypeHierarchyResolver();
@@ -176,6 +176,10 @@ public class InjectorForTopDownAnalyzerForJvm {
         psiClassFinderForJvm.setCompilerDependencies(compilerDependencies);
         psiClassFinderForJvm.setProject(project);
 
+        this.namespaceFactory.setConfiguration(javaBridgeConfiguration);
+        this.namespaceFactory.setModuleDescriptor(moduleDescriptor);
+        this.namespaceFactory.setTrace(bindingTrace);
+
         declarationResolver.setAnnotationResolver(annotationResolver);
         declarationResolver.setContext(topDownAnalysisContext);
         declarationResolver.setDescriptorResolver(descriptorResolver);
@@ -207,10 +211,6 @@ public class InjectorForTopDownAnalyzerForJvm {
         delegationResolver.setContext(topDownAnalysisContext);
         delegationResolver.setTrace(bindingTrace);
 
-        namespaceFactory.setConfiguration(javaBridgeConfiguration);
-        namespaceFactory.setModuleDescriptor(moduleDescriptor);
-        namespaceFactory.setTrace(bindingTrace);
-
         overloadResolver.setContext(topDownAnalysisContext);
         overloadResolver.setTrace(bindingTrace);
 
@@ -291,4 +291,8 @@ public class InjectorForTopDownAnalyzerForJvm {
         return this.javaBridgeConfiguration;
     }
 
+    public NamespaceFactoryImpl getNamespaceFactory() {
+        return this.namespaceFactory;
+    }
+
 }

compiler/frontend/src/org/jetbrains/jet/lang/resolve/BindingContext.java

@@ -91,6 +91,8 @@ public interface BindingContext {
     WritableSlice<JetTypeReference, JetScope> TYPE_RESOLUTION_SCOPE = Slices.createSimpleSlice();
     WritableSlice<JetExpression, JetScope> RESOLUTION_SCOPE = Slices.createSimpleSlice();
 
+    WritableSlice<ScriptDescriptor, JetScope> SCRIPT_SCOPE = Slices.createSimpleSlice();
+
     /** Collected during analyze, used in IDE in auto-cast completion */
     WritableSlice<JetExpression, DataFlowInfo> NON_DEFAULT_EXPRESSION_DATA_FLOW = Slices.createSimpleSlice();
 

compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/receivers/ScriptReceiver.java

@@ -37,7 +37,7 @@ public class ScriptReceiver implements ThisReceiverDescriptor {
 
     @NotNull
     @Override
-    public DeclarationDescriptor getDeclarationDescriptor() {
+    public ScriptDescriptor getDeclarationDescriptor() {
         return scriptDescriptor;
     }
 

compiler/frontend/src/org/jetbrains/jet/lang/types/expressions/ExpressionTypingServices.java

@@ -194,6 +194,11 @@ public class ExpressionTypingServices {
         scope.changeLockLevel(WritableScope.LockLevel.BOTH);
         JetType r = getBlockReturnedTypeWithWritableScope(scope, block, coercionStrategyForLastExpression, context, trace);
         scope.changeLockLevel(WritableScope.LockLevel.READING);
+
+        if (containingDescriptor instanceof ScriptDescriptor) {
+            trace.record(BindingContext.SCRIPT_SCOPE, (ScriptDescriptor) containingDescriptor, scope);
+        }
+
         return r;
     }
 

compiler/testData/repl/function.repl

@@ -0,0 +1,4 @@
+>>> fun foo() = 2
+null
+>>> foo()
+2

compiler/testData/repl/functionReferencesPrev.repl

@@ -0,0 +1,6 @@
+>>> val x = 1
+null
+>>> fun add1(y: Int) = x + y
+null
+>>> add1(999999)
+1000000

compiler/tests/org/jetbrains/jet/repl/ReplInterpreterTest.java

@@ -76,4 +76,15 @@ public class ReplInterpreterTest {
         testFile("simple.repl");
     }
 
+    @Test
+    public void function() {
+        testFile("function.repl");
+    }
+
+    @Test
+    public void functionReferencesPrev() {
+        testFile("functionReferencesPrev.repl");
+    }
+
+
 }

injector-generator/src/org/jetbrains/jet/di/AllInjectorsGenerator.java

@@ -89,6 +89,7 @@ public class AllInjectorsGenerator {
         generator.addPublicField(JavaBridgeConfiguration.class);
         generator.addField(JavaDescriptorResolver.class);
         generator.addField(PsiClassFinderForJvm.class);
+        generator.addPublicField(NamespaceFactoryImpl.class);
         generator.generate("compiler/frontend.java/src", "org.jetbrains.jet.di", "InjectorForTopDownAnalyzerForJvm");
     }