001 /*
002 * Copyright 2010-2013 JetBrains s.r.o.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017 package org.jetbrains.k2js.translate.reference;
018
019 import com.google.common.collect.Maps;
020 import com.google.dart.compiler.backend.js.ast.JsExpression;
021 import com.google.dart.compiler.backend.js.ast.JsLiteral;
022 import com.google.dart.compiler.backend.js.ast.JsNode;
023 import com.google.dart.compiler.backend.js.ast.JsReturn;
024 import com.intellij.util.SmartList;
025 import org.jetbrains.annotations.NotNull;
026 import org.jetbrains.annotations.Nullable;
027 import org.jetbrains.jet.lang.descriptors.CallableDescriptor;
028 import org.jetbrains.jet.lang.descriptors.DeclarationDescriptor;
029 import org.jetbrains.jet.lang.descriptors.SimpleFunctionDescriptor;
030 import org.jetbrains.jet.lang.descriptors.ValueParameterDescriptor;
031 import org.jetbrains.jet.lang.psi.JetCallExpression;
032 import org.jetbrains.jet.lang.psi.JetFunction;
033 import org.jetbrains.jet.lang.resolve.calls.model.ResolvedValueArgument;
034 import org.jetbrains.k2js.translate.callTranslator.CallInfo;
035 import org.jetbrains.k2js.translate.callTranslator.CallTranslatorPackage;
036 import org.jetbrains.k2js.translate.context.TemporaryVariable;
037 import org.jetbrains.k2js.translate.context.TranslationContext;
038 import org.jetbrains.k2js.translate.utils.JsAstUtils;
039 import org.jetbrains.k2js.translate.utils.mutator.LastExpressionMutator;
040 import org.jetbrains.k2js.translate.utils.mutator.Mutator;
041
042 import java.util.List;
043 import java.util.Map;
044
045 import static org.jetbrains.k2js.translate.reference.CallArgumentTranslator.translateSingleArgument;
046 import static org.jetbrains.k2js.translate.utils.BindingUtils.getFunctionForDescriptor;
047 import static org.jetbrains.k2js.translate.utils.FunctionBodyTranslator.translateFunctionBody;
048
049 public final class InlinedCallExpressionTranslator extends AbstractCallExpressionTranslator {
050
051 @SuppressWarnings("UnusedParameters")
052 public static boolean shouldBeInlined(@NotNull JetCallExpression expression, @NotNull TranslationContext context) {
053 //TODO: inlining turned off
054 //ResolvedCall<?> resolvedCall = CallUtilPackage.getFunctionResolvedCall(expression, bindingContext());
055 //CallableDescriptor descriptor = resolvedCall.getCandidateDescriptor();
056 //if (descriptor instanceof SimpleFunctionDescriptor) {
057 // return ((SimpleFunctionDescriptor)descriptor).isInline();
058 //}
059 return false;
060 }
061
062 @NotNull
063 public static JsExpression translate(
064 @NotNull JetCallExpression expression,
065 @Nullable JsExpression receiver,
066 @NotNull TranslationContext context
067 ) {
068 return (new InlinedCallExpressionTranslator(expression, receiver, context)).translate();
069 }
070
071 private InlinedCallExpressionTranslator(
072 @NotNull JetCallExpression expression, @Nullable JsExpression receiver,
073 @NotNull TranslationContext context
074 ) {
075 super(expression, receiver, context);
076 }
077
078 @NotNull
079 private JsExpression translate() {
080 TranslationContext contextWithAllParametersAliased = createContextForInlining();
081 JsNode translatedBody = translateFunctionBody(getFunctionDescriptor(), getFunctionBody(), contextWithAllParametersAliased);
082 //TODO: declare uninitialized temporary
083 TemporaryVariable temporaryVariable = contextWithAllParametersAliased.declareTemporary(JsLiteral.NULL);
084 JsNode mutatedBody = LastExpressionMutator.mutateLastExpression(translatedBody, new InlineFunctionMutator(temporaryVariable));
085 context().addStatementToCurrentBlock(JsAstUtils.convertToBlock(mutatedBody));
086 return temporaryVariable.reference();
087 }
088
089 @NotNull
090 private JetFunction getFunctionBody() {
091 return getFunctionForDescriptor(getFunctionDescriptor());
092 }
093
094 @NotNull
095 private SimpleFunctionDescriptor getFunctionDescriptor() {
096 CallableDescriptor descriptor = resolvedCall.getCandidateDescriptor().getOriginal();
097 assert descriptor instanceof SimpleFunctionDescriptor : "Inlined functions should have descriptor of type SimpleFunctionDescriptor";
098 return (SimpleFunctionDescriptor)descriptor;
099 }
100
101 @NotNull
102 private TranslationContext createContextForInlining() {
103 TranslationContext contextForInlining = context();
104 contextForInlining = createContextWithAliasForThisExpression(contextForInlining);
105 return createContextWithAliasesForParameters(contextForInlining);
106 }
107
108 @NotNull
109 private TranslationContext createContextWithAliasesForParameters(@NotNull TranslationContext contextForInlining) {
110 Map<DeclarationDescriptor, JsExpression> aliases = Maps.newHashMap();
111 for (ValueParameterDescriptor parameterDescriptor : resolvedCall.getResultingDescriptor().getValueParameters()) {
112 TemporaryVariable aliasForArgument = createAliasForArgument(parameterDescriptor);
113 aliases.put(parameterDescriptor, aliasForArgument.name().makeRef());
114 }
115 return contextForInlining.innerContextWithDescriptorsAliased(aliases);
116 }
117
118 @NotNull
119 private TranslationContext createContextWithAliasForThisExpression(@NotNull TranslationContext contextForInlining) {
120 TranslationContext contextWithAliasForThisExpression = contextForInlining;
121 SimpleFunctionDescriptor functionDescriptor = getFunctionDescriptor();
122 CallInfo callInfo = CallTranslatorPackage.getCallInfo(contextForInlining, resolvedCall, receiver);
123 JsExpression receiver = callInfo.getReceiverObject();
124 if (receiver != null) {
125 contextWithAliasForThisExpression =
126 contextWithAlias(contextWithAliasForThisExpression, receiver, functionDescriptor.getReceiverParameter());
127 }
128 JsExpression thisObject = callInfo.getThisObject();
129 if (thisObject != null) {
130 contextWithAliasForThisExpression =
131 contextWithAlias(contextWithAliasForThisExpression, thisObject, functionDescriptor.getExpectedThisObject());
132 }
133 return contextWithAliasForThisExpression;
134 }
135
136 @NotNull
137 private TranslationContext contextWithAlias(@NotNull TranslationContext contextWithAliasForThisExpression,
138 @NotNull JsExpression aliasExpression, @Nullable DeclarationDescriptor descriptorToAlias) {
139 TemporaryVariable aliasForReceiver = context().declareTemporary(aliasExpression);
140 assert descriptorToAlias != null;
141 TranslationContext newContext =
142 contextWithAliasForThisExpression.innerContextWithAliased(descriptorToAlias, aliasForReceiver.reference());
143 newContext.addStatementToCurrentBlock(aliasForReceiver.assignmentExpression().makeStmt());
144 return newContext;
145 }
146
147 @NotNull
148 private TemporaryVariable createAliasForArgument(@NotNull ValueParameterDescriptor parameterDescriptor) {
149 List<ResolvedValueArgument> actualArguments = resolvedCall.getValueArgumentsByIndex();
150 if (actualArguments == null) {
151 throw new IllegalStateException("Failed to arrange value arguments by index: " + resolvedCall.getResultingDescriptor());
152 }
153 ResolvedValueArgument actualArgument = actualArguments.get(parameterDescriptor.getIndex());
154 JsExpression translatedArgument = translateArgument(actualArgument);
155 TemporaryVariable aliasForArgument = context().declareTemporary(translatedArgument);
156 context().addStatementToCurrentBlock(aliasForArgument.assignmentExpression().makeStmt());
157 return aliasForArgument;
158 }
159
160 @NotNull
161 private JsExpression translateArgument(@NotNull ResolvedValueArgument actualArgument) {
162 List<JsExpression> result = new SmartList<JsExpression>();
163 translateSingleArgument(actualArgument, result, context(), true);
164 assert result.size() == 1 : "We always wrap varargs in kotlin calls.";
165 return result.get(0);
166 }
167
168 private static final class InlineFunctionMutator implements Mutator {
169
170 @NotNull
171 private final TemporaryVariable toAssignTo;
172
173 private InlineFunctionMutator(@NotNull TemporaryVariable to) {
174 toAssignTo = to;
175 }
176
177 @NotNull
178 @Override
179 public JsNode mutate(@NotNull JsNode node) {
180 if (node instanceof JsReturn) {
181 JsExpression returnedExpression = ((JsReturn)node).getExpression();
182 return JsAstUtils.assignment(toAssignTo.name().makeRef(), returnedExpression);
183 }
184 return node;
185 }
186 }
187 }