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Attempting to increase performance of AST processing

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This commit is contained in:
konsoletyper 2015-03-15 15:02:34 +03:00
parent b6cf7c4cba
commit 6c57fb866f
5 changed files with 150 additions and 15 deletions
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134
teavm-core/src/main/java/org/teavm/javascript/AllBlocksCountVisitor.java Normal file
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@ -0,0 +1,134 @@
/*
* Copyright 2015 Alexey Andreev.
*
* 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.teavm.javascript;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.teavm.javascript.ast.*;
/**
*
* @author Alexey Andreev
*/
class AllBlocksCountVisitor implements StatementVisitor {
private Map<IdentifiedStatement, Integer> blocksCount = new HashMap<>();
private IdentifiedStatement currentBlock;
public void visit(List<Statement> statements) {
if (statements == null) {
return;
}
for (Statement part : statements) {
part.acceptVisitor(this);
}
}
public int getCount(IdentifiedStatement statement) {
Integer result = blocksCount.get(statement);
return result != null ? result : 0;
}
@Override
public void visit(AssignmentStatement statement) {
}
@Override
public void visit(SequentialStatement statement) {
visit(statement.getSequence());
}
@Override
public void visit(ConditionalStatement statement) {
visit(statement.getConsequent());
visit(statement.getAlternative());
}
@Override
public void visit(SwitchStatement statement) {
IdentifiedStatement oldCurrentBlock = currentBlock;
currentBlock = statement;
for (SwitchClause clause : statement.getClauses()) {
visit(clause.getBody());
}
visit(statement.getDefaultClause());
currentBlock = oldCurrentBlock;
}
@Override
public void visit(WhileStatement statement) {
IdentifiedStatement oldCurrentBlock = currentBlock;
currentBlock = statement;
visit(statement.getBody());
currentBlock = oldCurrentBlock;
}
@Override
public void visit(BlockStatement statement) {
IdentifiedStatement oldCurrentBlock = currentBlock;
currentBlock = statement;
visit(statement.getBody());
currentBlock = oldCurrentBlock;
}
@Override
public void visit(BreakStatement statement) {
IdentifiedStatement target = statement.getTarget();
if (target == null) {
target = currentBlock;
}
blocksCount.put(target, getCount(target) + 1);
}
@Override
public void visit(ContinueStatement statement) {
IdentifiedStatement target = statement.getTarget();
if (target == null) {
target = currentBlock;
}
blocksCount.put(target, getCount(target) + 1);
}
@Override
public void visit(ReturnStatement statement) {
}
@Override
public void visit(ThrowStatement statement) {
}
@Override
public void visit(InitClassStatement statement) {
}
@Override
public void visit(TryCatchStatement statement) {
visit(statement.getProtectedBody());
visit(statement.getHandler());
}
@Override
public void visit(GotoPartStatement statement) {
}
@Override
public void visit(MonitorEnterStatement statement) {
}
@Override
public void visit(MonitorExitStatement statement) {
}
}

12
teavm-core/src/main/java/org/teavm/javascript/BreakEliminator.java
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@ -28,6 +28,13 @@ class BreakEliminator implements StatementVisitor {
private List<Statement> currentSequence;
private boolean sequenceEscapes;
private int currentIndex;
private AllBlocksCountVisitor usageCounter;
public void eliminate(Statement statement) {
usageCounter = new AllBlocksCountVisitor();
statement.acceptVisitor(usageCounter);
statement.acceptVisitor(this);
}
private void processSequence(List<Statement> statements) {
List<Statement> oldSequence = currentSequence;
@ -97,10 +104,7 @@ class BreakEliminator implements StatementVisitor {
@Override
public void visit(BreakStatement statement) {
if (blockSuccessors.containsKey(statement.getTarget())) {
BlockCountVisitor usageCounter = new BlockCountVisitor(
(BlockStatement)statement.getTarget());
statement.getTarget().acceptVisitor(usageCounter);
if (usageCounter.getCount() == 1) {
if (usageCounter.getCount(statement.getTarget()) == 1) {
currentSequence.subList(currentIndex, currentSequence.size()).clear();
List<Statement> successors = blockSuccessors.remove(statement.getTarget());
currentSequence.addAll(successors);

4
teavm-core/src/main/java/org/teavm/javascript/Optimizer.java
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@ -36,7 +36,7 @@ public class Optimizer {
}
}
BreakEliminator breakEliminator = new BreakEliminator();
method.getBody().acceptVisitor(breakEliminator);
breakEliminator.eliminate(method.getBody());
OptimizingVisitor optimizer = new OptimizingVisitor(preservedVars, stats.reads);
method.getBody().acceptVisitor(optimizer);
method.setBody(optimizer.resultStmt);
@ -67,7 +67,7 @@ public class Optimizer {
for (int i = 0; i < splitter.size(); ++i) {
AsyncMethodPart part = method.getBody().get(i);
BreakEliminator breakEliminator = new BreakEliminator();
part.getStatement().acceptVisitor(breakEliminator);
breakEliminator.eliminate(part.getStatement());
OptimizingVisitor optimizer = new OptimizingVisitor(preservedVars, readFrequencies[i]);
part.getStatement().acceptVisitor(optimizer);
part.setStatement(optimizer.resultStmt);

9
teavm-core/src/main/java/org/teavm/javascript/OptimizingVisitor.java
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@ -370,15 +370,12 @@ class OptimizingVisitor implements StatementVisitor, ExprVisitor {
return;
}
Statement last = statements.get(statements.size() - 1);
if (last instanceof BreakStatement) {
BreakStatement breakStmt = (BreakStatement)last;
if (exit != null) {
IdentifiedStatement target = breakStmt.getTarget();
if (last instanceof BreakStatement && exit != null) {
IdentifiedStatement target = ((BreakStatement)last).getTarget();
if (exit == target) {
statements.remove(statements.size() - 1);
}
}
}
if (statements.isEmpty()) {
return;
}
@ -453,6 +450,7 @@ class OptimizingVisitor implements StatementVisitor, ExprVisitor {
}
}
private void normalizeConditional(ConditionalStatement stmt) {
if (stmt.getConsequent().isEmpty()) {
stmt.getConsequent().addAll(stmt.getAlternative());
@ -566,7 +564,6 @@ class OptimizingVisitor implements StatementVisitor, ExprVisitor {
public void visit(BlockStatement statement) {
List<Statement> statements = processSequence(statement.getBody());
eliminateRedundantBreaks(statements, statement);
statements = processSequence(statements);
BlockCountVisitor usageCounter = new BlockCountVisitor(statement);
usageCounter.visit(statements);
if (usageCounter.getCount() == 0) {

2
teavm-core/src/main/java/org/teavm/tooling/TeaVMTool.java
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@ -292,7 +292,7 @@ public class TeaVMTool {
}
targetDirectory.mkdirs();
try (Writer writer = new OutputStreamWriter(new BufferedOutputStream(
new FileOutputStream(new File(targetDirectory, targetFileName))), "UTF-8")) {
new FileOutputStream(new File(targetDirectory, targetFileName)), 65536), "UTF-8")) {
if (runtime == RuntimeCopyOperation.MERGED) {
vm.add(runtimeInjector);
}