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Do not insert GC write barriers when value assigned to field is known to be null or constant literal

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This commit is contained in:
Alexey Andreev 2019-12-05 15:36:32 +03:00
parent 72fc62f082
commit 9d0a53175a
1 changed files with 33 additions and 4 deletions
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37
core/src/main/java/org/teavm/model/lowlevel/WriteBarrierInsertion.java
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@ -30,6 +30,7 @@ import org.teavm.model.instructions.AbstractInstructionVisitor;
import org.teavm.model.instructions.ArrayElementType; import org.teavm.model.instructions.ArrayElementType;
import org.teavm.model.instructions.AssignInstruction; import org.teavm.model.instructions.AssignInstruction;
import org.teavm.model.instructions.CastInstruction; import org.teavm.model.instructions.CastInstruction;
import org.teavm.model.instructions.ClassConstantInstruction;
import org.teavm.model.instructions.CloneArrayInstruction; import org.teavm.model.instructions.CloneArrayInstruction;
import org.teavm.model.instructions.ConstructArrayInstruction; import org.teavm.model.instructions.ConstructArrayInstruction;
import org.teavm.model.instructions.ConstructInstruction; import org.teavm.model.instructions.ConstructInstruction;
@ -40,8 +41,10 @@ import org.teavm.model.instructions.InvokeInstruction;
import org.teavm.model.instructions.MonitorEnterInstruction; import org.teavm.model.instructions.MonitorEnterInstruction;
import org.teavm.model.instructions.MonitorExitInstruction; import org.teavm.model.instructions.MonitorExitInstruction;
import org.teavm.model.instructions.NullCheckInstruction; import org.teavm.model.instructions.NullCheckInstruction;
import org.teavm.model.instructions.NullConstantInstruction;
import org.teavm.model.instructions.PutElementInstruction; import org.teavm.model.instructions.PutElementInstruction;
import org.teavm.model.instructions.PutFieldInstruction; import org.teavm.model.instructions.PutFieldInstruction;
import org.teavm.model.instructions.StringConstantInstruction;
import org.teavm.model.util.DominatorWalker; import org.teavm.model.util.DominatorWalker;
import org.teavm.model.util.DominatorWalkerCallback; import org.teavm.model.util.DominatorWalkerCallback;
import org.teavm.model.util.DominatorWalkerContext; import org.teavm.model.util.DominatorWalkerContext;
@ -61,14 +64,19 @@ public class WriteBarrierInsertion {
if (program.basicBlockCount() == 0) { if (program.basicBlockCount() == 0) {
return; return;
} }
new DominatorWalker(program).walk(new WalkerCallbackImpl()); new DominatorWalker(program).walk(new WalkerCallbackImpl(program.variableCount()));
} }
class WalkerCallbackImpl extends AbstractInstructionVisitor implements DominatorWalkerCallback<State> { class WalkerCallbackImpl extends AbstractInstructionVisitor implements DominatorWalkerCallback<State> {
private DominatorWalkerContext context; private DominatorWalkerContext context;
private boolean[] constantVariables;
IntHashSet installedBarriers = new IntHashSet(); IntHashSet installedBarriers = new IntHashSet();
State state; State state;
WalkerCallbackImpl(int variableCount) {
constantVariables = new boolean[variableCount];
}
@Override @Override
public void setContext(DominatorWalkerContext context) { public void setContext(DominatorWalkerContext context) {
this.context = context; this.context = context;
@ -108,10 +116,25 @@ public class WriteBarrierInsertion {
} }
} }
@Override
public void visit(NullConstantInstruction insn) {
constantVariables[insn.getReceiver().getIndex()] = true;
}
@Override
public void visit(ClassConstantInstruction insn) {
constantVariables[insn.getReceiver().getIndex()] = true;
}
@Override
public void visit(StringConstantInstruction insn) {
constantVariables[insn.getReceiver().getIndex()] = true;
}
@Override @Override
public void visit(PutFieldInstruction insn) { public void visit(PutFieldInstruction insn) {
if (insn.getInstance() != null && isManagedReferenceType(insn.getFieldType())) { if (insn.getInstance() != null && isManagedReferenceType(insn.getFieldType())) {
installBarrier(insn, insn.getInstance()); installBarrier(insn, insn.getInstance(), insn.getValue());
} }
} }
@ -169,7 +192,7 @@ public class WriteBarrierInsertion {
@Override @Override
public void visit(PutElementInstruction insn) { public void visit(PutElementInstruction insn) {
if (insn.getType() == ArrayElementType.OBJECT) { if (insn.getType() == ArrayElementType.OBJECT) {
installBarrier(insn, insn.getArray()); installBarrier(insn, insn.getArray(), insn.getValue());
} }
} }
@ -192,9 +215,15 @@ public class WriteBarrierInsertion {
if (installedBarriers.contains(from.getIndex())) { if (installedBarriers.contains(from.getIndex())) {
markAsInstalled(to.getIndex()); markAsInstalled(to.getIndex());
} }
if (constantVariables[from.getIndex()]) {
constantVariables[to.getIndex()] = true;
}
} }
private void installBarrier(Instruction instruction, Variable variable) { private void installBarrier(Instruction instruction, Variable variable, Variable value) {
if (constantVariables[value.getIndex()]) {
return;
}
if (markAsInstalled(variable.getIndex())) { if (markAsInstalled(variable.getIndex())) {
InvokeInstruction invoke = new InvokeInstruction(); InvokeInstruction invoke = new InvokeInstruction();
invoke.setType(InvocationType.SPECIAL); invoke.setType(InvocationType.SPECIAL);