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Fix performance regression. See

Browse Source 
https://github.com/konsoletyper/teavm/issues/102
This commit is contained in:
Alexey Andreev 2015-04-30 15:03:47 +04:00
parent 5db66bb17c
commit 98e2142332
2 changed files with 49 additions and 55 deletions
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2
teavm-core/src/main/java/org/teavm/javascript/BreakEliminator.java
View File

@ -156,6 +156,6 @@ class BreakEliminator implements StatementVisitor {
}
private boolean escapes(List<Statement> statements) {
return new EscapingStatementFinder().check(statements);
return new EscapingStatementFinder(usageCounter).check(statements);
}
}

100
teavm-core/src/main/java/org/teavm/javascript/EscapingStatementFinder.java
View File

@ -15,9 +15,7 @@
*/
package org.teavm.javascript;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.teavm.javascript.ast.*;
/**
@ -25,39 +23,48 @@ import org.teavm.javascript.ast.*;
* @author Alexey Andreev
*/
class EscapingStatementFinder implements StatementVisitor {
AllBlocksCountVisitor blockCountVisitor;
public boolean escaping;
private boolean last = true;
private Set<IdentifiedStatement> outerStatements = new HashSet<>();
private Set<IdentifiedStatement> breakTargets = new HashSet<>();
private IdentifiedStatement currentBlock;
public EscapingStatementFinder(AllBlocksCountVisitor blockCountVisitor) {
this.blockCountVisitor = blockCountVisitor;
}
private boolean isEmpty(Statement statement) {
if (!(statement instanceof SequentialStatement)) {
return false;
}
SequentialStatement seq = (SequentialStatement)statement;
for (int i = seq.getSequence().size() - 1; i >= 0; --i) {
if (!isEmpty(seq.getSequence().get(i))) {
return false;
}
}
return true;
}
public boolean check(List<Statement> statements) {
if (escaping) {
return true;
}
if (statements.isEmpty()) {
escaping = last;
escaping = true;
return true;
}
boolean oldLast = last;
for (int i = 0; i < statements.size(); ++i) {
last = false;
statements.get(i).acceptVisitor(this);
if (escaping) {
break;
}
}
last = oldLast;
if (!escaping) {
statements.get(statements.size() - 1).acceptVisitor(this);
}
last = oldLast;
for (int i = statements.size() - 1; i >= 0; --i) {
Statement stmt = statements.get(i);
if (!isEmpty(stmt)) {
stmt.acceptVisitor(this);
return escaping;
}
}
escaping = true;
return true;
}
@Override
public void visit(AssignmentStatement statement) {
escaping |= last;
escaping |= true;
}
@Override
@ -74,56 +81,42 @@ class EscapingStatementFinder implements StatementVisitor {
@Override
public void visit(SwitchStatement statement) {
IdentifiedStatement oldCurrentBlock = currentBlock;
currentBlock = statement;
outerStatements.add(statement);
if (blockCountVisitor.getCount(statement) > 0) {
escaping = true;
return;
}
for (SwitchClause clause : statement.getClauses()) {
if (check(clause.getBody())) {
break;
}
}
if (!escaping) {
check(statement.getDefaultClause());
outerStatements.remove(statement);
currentBlock = oldCurrentBlock;
if (breakTargets.contains(statement)) {
escaping |= last;
}
}
@Override
public void visit(WhileStatement statement) {
IdentifiedStatement oldCurrentBlock = currentBlock;
currentBlock = statement;
outerStatements.add(statement);
if (!check(statement.getBody()) && statement.getCondition() != null) {
escaping |= last;
if (blockCountVisitor.getCount(statement) > 0) {
escaping = true;
return;
}
outerStatements.remove(statement);
currentBlock = oldCurrentBlock;
if (breakTargets.contains(statement)) {
escaping |= last;
if (statement.getCondition() != null && check(statement.getBody())) {
escaping = true;
}
}
@Override
public void visit(BlockStatement statement) {
IdentifiedStatement oldCurrentBlock = currentBlock;
currentBlock = statement;
outerStatements.add(statement);
check(statement.getBody());
outerStatements.remove(statement);
currentBlock = oldCurrentBlock;
if (breakTargets.contains(statement)) {
escaping |= last;
if (blockCountVisitor.getCount(statement) > 0) {
escaping = true;
return;
}
check(statement.getBody());
}
@Override
public void visit(BreakStatement statement) {
IdentifiedStatement target = statement.getTarget() != null ? statement.getTarget() : currentBlock;
if (target != null) {
breakTargets.add(target);
}
}
@Override
@ -140,14 +133,15 @@ class EscapingStatementFinder implements StatementVisitor {
@Override
public void visit(InitClassStatement statement) {
escaping |= last;
escaping = true;
}
@Override
public void visit(TryCatchStatement statement) {
check(statement.getProtectedBody());
if (!check(statement.getProtectedBody())) {
check(statement.getHandler());
}
}
@Override
public void visit(GotoPartStatement statement) {
@ -155,11 +149,11 @@ class EscapingStatementFinder implements StatementVisitor {
@Override
public void visit(MonitorEnterStatement statement) {
escaping |= last;
escaping = true;
}
@Override
public void visit(MonitorExitStatement statement) {
escaping |= last;
escaping = true;
}
}