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wasm: add optimization that removes unused functions from wasm module
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@ -66,6 +66,7 @@ import org.teavm.backend.wasm.model.expression.WasmLoadInt32;
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import org.teavm.backend.wasm.model.expression.WasmReturn;
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import org.teavm.backend.wasm.model.expression.WasmReturn;
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import org.teavm.backend.wasm.model.expression.WasmSetLocal;
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import org.teavm.backend.wasm.model.expression.WasmSetLocal;
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import org.teavm.backend.wasm.model.expression.WasmStoreInt32;
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import org.teavm.backend.wasm.model.expression.WasmStoreInt32;
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import org.teavm.backend.wasm.optimization.UnusedFunctionElimination;
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import org.teavm.backend.wasm.patches.ClassPatch;
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import org.teavm.backend.wasm.patches.ClassPatch;
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import org.teavm.backend.wasm.render.WasmBinaryRenderer;
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import org.teavm.backend.wasm.render.WasmBinaryRenderer;
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import org.teavm.backend.wasm.render.WasmBinaryWriter;
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import org.teavm.backend.wasm.render.WasmBinaryWriter;
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@ -338,6 +339,8 @@ public class WasmTarget implements TeaVMTarget {
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module.getFunctionTable().add(module.getFunctions().get(function));
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module.getFunctionTable().add(module.getFunctions().get(function));
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}
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}
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new UnusedFunctionElimination(module).apply();
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WasmBinaryWriter writer = new WasmBinaryWriter();
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WasmBinaryWriter writer = new WasmBinaryWriter();
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WasmBinaryRenderer renderer = new WasmBinaryRenderer(writer);
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WasmBinaryRenderer renderer = new WasmBinaryRenderer(writer);
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renderer.render(module);
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renderer.render(module);
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@ -40,6 +40,14 @@ public class WasmModule {
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function.module = this;
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function.module = this;
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}
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}
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public void remove(WasmFunction function) {
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if (function.getModule() != this) {
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return;
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}
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function.module = null;
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functions.remove(function.getName());
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}
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public Map<String, WasmFunction> getFunctions() {
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public Map<String, WasmFunction> getFunctions() {
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return readonlyFunctions;
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return readonlyFunctions;
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}
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}
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@ -0,0 +1,77 @@
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/*
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* Copyright 2016 Alexey Andreev.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.teavm.backend.wasm.optimization;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Set;
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import java.util.stream.Collectors;
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import org.teavm.backend.wasm.model.WasmFunction;
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import org.teavm.backend.wasm.model.WasmModule;
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import org.teavm.backend.wasm.model.expression.WasmCall;
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import org.teavm.backend.wasm.model.expression.WasmDefaultExpressionVisitor;
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import org.teavm.backend.wasm.model.expression.WasmExpression;
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import org.teavm.backend.wasm.model.expression.WasmExpressionVisitor;
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public class UnusedFunctionElimination {
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private WasmModule module;
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private Set<WasmFunction> usedFunctions = new HashSet<>();
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public UnusedFunctionElimination(WasmModule module) {
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this.module = module;
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}
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public void apply() {
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List<WasmFunction> exported = module.getFunctions().values().stream()
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.filter(function -> function.getExportName() != null)
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.collect(Collectors.toList());
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for (WasmFunction function : exported) {
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use(function);
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}
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for (WasmFunction function : module.getFunctionTable()) {
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use(function);
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}
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if (module.getStartFunction() != null) {
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use(module.getStartFunction());
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}
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for (WasmFunction function : module.getFunctions().values().toArray(new WasmFunction[0])) {
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if (!usedFunctions.contains(function)) {
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module.remove(function);
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}
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}
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}
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private void use(WasmFunction function) {
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if (!usedFunctions.add(function)) {
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return;
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}
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for (WasmExpression part : function.getBody()) {
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part.acceptVisitor(visitor);
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}
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}
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private WasmExpressionVisitor visitor = new WasmDefaultExpressionVisitor() {
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@Override
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public void visit(WasmCall expression) {
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super.visit(expression);
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WasmFunction function = module.getFunctions().get(expression.getFunctionName());
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if (function != null) {
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use(function);
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}
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}
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};
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}
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