src/main/java/com/android/tools/r8/graph/DexDebugInfo.java - r8 - Git at Google

 // Copyright (c) 2016, the R8 project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 package com.android.tools.r8.graph;

 import static com.android.tools.r8.utils.DexDebugUtils.verifySetPositionFramesFollowedByDefaultEvent;

 import com.android.tools.r8.debuginfo.DebugRepresentation;
 import com.android.tools.r8.dex.Constants;
 import com.android.tools.r8.dex.DebugBytecodeWriter;
 import com.android.tools.r8.dex.IndexedItemCollection;
 import com.android.tools.r8.dex.MixedSectionCollection;
 import com.android.tools.r8.dex.code.DexInstruction;
 import com.android.tools.r8.errors.Unreachable;
 import com.android.tools.r8.graph.lens.GraphLens;
 import com.android.tools.r8.utils.ArrayUtils;
 import com.android.tools.r8.utils.LebUtils;
 import com.android.tools.r8.utils.StringUtils;
 import com.android.tools.r8.utils.structural.CompareToVisitor;
 import com.android.tools.r8.utils.structural.Equatable;
 import com.android.tools.r8.utils.structural.HashingVisitor;
 import com.android.tools.r8.utils.structural.StructuralItem;
 import com.android.tools.r8.utils.structural.StructuralMapping;
 import com.android.tools.r8.utils.structural.StructuralSpecification;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Objects;

 public abstract class DexDebugInfo extends CachedHashValueDexItem
     implements StructuralItem<DexDebugInfo> {

   private enum DebugInfoKind {
     EVENT_BASED,
     PC_BASED
   }

   abstract DebugInfoKind getKind();

   abstract int internalAcceptCompareTo(DexDebugInfo other, CompareToVisitor visitor);

   public abstract int getStartLine();

   public abstract int getParameterCount();

   public boolean isEventBasedInfo() {
     return getKind() == DebugInfoKind.EVENT_BASED;
   }

   public boolean isPcBasedInfo() {
     return getKind() == DebugInfoKind.PC_BASED;
   }

   public EventBasedDebugInfo asEventBasedInfo() {
     return null;
   }

   public PcBasedDebugInfo asPcBasedInfo() {
     return null;
   }

   @Override
   protected abstract void collectMixedSectionItems(MixedSectionCollection collection);

   @Override
   public abstract DexDebugInfo self();

   @Override
   public StructuralMapping<DexDebugInfo> getStructuralMapping() {
     throw new Unreachable();
   }

   @Override
   public abstract void acceptHashing(HashingVisitor visitor);

   @Override
   public int acceptCompareTo(DexDebugInfo other, CompareToVisitor visitor) {
     int diff = visitor.visitInt(getKind().ordinal(), other.getKind().ordinal());
     if (diff != 0) {
       return diff;
     }
     return internalAcceptCompareTo(other, visitor);
   }

   @Override
   protected final boolean computeEquals(Object other) {
     return Equatable.equalsImpl(this, other);
   }

   public static class PcBasedDebugInfo extends DexDebugInfo implements DexDebugInfoForWriting {
     public static final int START_LINE = 1;
     private final int parameterCount;
     private final int maxPc;

     private static void specify(StructuralSpecification<PcBasedDebugInfo, ?> spec) {
       spec.withInt(d -> d.parameterCount).withInt(d -> d.maxPc);
     }

     public PcBasedDebugInfo(int parameterCount, int maxPc) {
       this.parameterCount = parameterCount;
       this.maxPc = maxPc;
     }

     public int getMaxPc() {
       return maxPc;
     }

     @Override
     public int getStartLine() {
       return START_LINE;
     }

     @Override
     public int getParameterCount() {
       return parameterCount;
     }

     @Override
     public DexDebugInfo self() {
       return this;
     }

     @Override
     public PcBasedDebugInfo asPcBasedInfo() {
       return this;
     }

     @Override
     DebugInfoKind getKind() {
       return DebugInfoKind.PC_BASED;
     }

     @Override
     protected int computeHashCode() {
       return Objects.hash(parameterCount, maxPc);
     }

     @Override
     public void acceptHashing(HashingVisitor visitor) {
       visitor.visit(this, PcBasedDebugInfo::specify);
     }

     @Override
     int internalAcceptCompareTo(DexDebugInfo other, CompareToVisitor visitor) {
       assert other.isPcBasedInfo();
       return visitor.visit(this, other.asPcBasedInfo(), PcBasedDebugInfo::specify);
     }

     @Override
     public void collectMixedSectionItems(MixedSectionCollection collection) {
       collection.add(this);
     }

     @Override
     public void collectIndexedItems(
         AppView<?> appView, GraphLens codeLens, IndexedItemCollection indexedItems) {
       // No indexed items to collect.
     }

     public static int estimatedWriteSize(int parameterCount, int maxPc) {
       return LebUtils.sizeAsUleb128(START_LINE)
           + LebUtils.sizeAsUleb128(parameterCount)
           + parameterCount * LebUtils.sizeAsUleb128(0)
           + 1
           + maxPc
           + 1;
     }

     @Override
     public int estimatedWriteSize() {
       return estimatedWriteSize(parameterCount, maxPc);
     }

     @Override
     public void write(
         DebugBytecodeWriter writer,
         ObjectToOffsetMapping mapping,
         GraphLens graphLens,
         GraphLens codeLens) {
       writer.putUleb128(START_LINE);
       writer.putUleb128(parameterCount);
       for (int i = 0; i < parameterCount; i++) {
         writer.putString(null);
       }
       mapping.dexItemFactory().zeroChangeDefaultEvent.writeOn(writer, mapping, graphLens, codeLens);
       for (int i = 0; i < maxPc; i++) {
         mapping
             .dexItemFactory()
             .oneChangeDefaultEvent
             .writeOn(writer, mapping, graphLens, codeLens);
       }
       writer.putByte(Constants.DBG_END_SEQUENCE);
     }

     @Override
     public String toString() {
       return "PcBasedDebugInfo (params: "
           + parameterCount
           + ", max-pc: "
           + StringUtils.hexString(maxPc, 2)
           + ")";
     }
   }

   public static class EventBasedDebugInfo extends DexDebugInfo {

     public final int startLine;
     public final DexString[] parameters;
     public DexDebugEvent[] events;

     private static void specify(StructuralSpecification<EventBasedDebugInfo, ?> spec) {
       spec.withInt(d -> d.startLine)
           .withItemArrayAllowingNullMembers(d -> d.parameters)
           .withItemArray(d -> d.events);
     }

     public EventBasedDebugInfo(int startLine, DexString[] parameters, DexDebugEvent[] events) {
       assert startLine >= 0;
       this.startLine = startLine;
       this.parameters = parameters;
       this.events = events;
     }

     @Override
     public DexDebugInfo self() {
       return this;
     }

     @Override
     public EventBasedDebugInfo asEventBasedInfo() {
       return this;
     }

     @Override
     DebugInfoKind getKind() {
       return DebugInfoKind.EVENT_BASED;
     }

     @Override
     public int getStartLine() {
       return startLine;
     }

     @Override
     public int getParameterCount() {
       return parameters.length;
     }

     public List<DexDebugEntry> computeEntries(DexMethod method, boolean isD8R8Synthesized) {
       DexDebugEntryBuilder builder = new DexDebugEntryBuilder(method, isD8R8Synthesized, startLine);
       for (DexDebugEvent event : events) {
         event.accept(builder);
       }
       return builder.build();
     }

     @Override
     public int computeHashCode() {
       return startLine + Arrays.hashCode(parameters) * 7 + Arrays.hashCode(events) * 13;
     }

     @Override
     public void acceptHashing(HashingVisitor visitor) {
       visitor.visit(this, EventBasedDebugInfo::specify);
     }

     @Override
     int internalAcceptCompareTo(DexDebugInfo other, CompareToVisitor visitor) {
       assert other.isEventBasedInfo();
       return visitor.visit(this, other.asEventBasedInfo(), EventBasedDebugInfo::specify);
     }

     public void collectIndexedItems(
         AppView<?> appView, GraphLens codeLens, IndexedItemCollection indexedItems) {
       for (DexString parameter : parameters) {
         if (parameter != null) {
           parameter.collectIndexedItems(indexedItems);
         }
       }
       for (DexDebugEvent event : events) {
         event.collectIndexedItems(appView, codeLens, indexedItems);
       }
     }

     @Override
     protected void collectMixedSectionItems(MixedSectionCollection collection) {
       // Only writable info should be iterated for collection.
       throw new Unreachable();
     }

     @Override
     public String toString() {
       StringBuilder builder = new StringBuilder();
       builder.append("DebugInfo (line " + startLine + ") events: [\n");
       for (DexDebugEvent event : events) {
         builder.append("  ").append(event).append("\n");
       }
       builder.append("  END_SEQUENCE\n");
       builder.append("]\n");
       return builder.toString();
     }
   }

   public static EventBasedDebugInfo createEventBasedInfoForMethodWithoutDebugInfo(
       DexEncodedMethod method, DexItemFactory factory) {
     return new EventBasedDebugInfo(
         0,
         new DexString[method.getParameters().size()],
         new DexDebugEvent[] {factory.zeroChangeDefaultEvent});
   }

   public static EventBasedDebugInfo convertToEventBased(DexCode code, DexItemFactory factory) {
     if (code.getDebugInfo() == null) {
       return null;
     }
     if (code.getDebugInfo().isEventBasedInfo()) {
       return code.getDebugInfo().asEventBasedInfo();
     }
     assert code.getDebugInfo().isPcBasedInfo();
     PcBasedDebugInfo pcBasedDebugInfo = code.getDebugInfo().asPcBasedInfo();
     assert DebugRepresentation.verifyLastExecutableInstructionWithinBound(
         code, pcBasedDebugInfo.maxPc);
     // Generate a line event at each throwing instruction.
     DexInstruction[] instructions = code.instructions;
     return forceConvertToEventBasedDebugInfo(
         PcBasedDebugInfo.START_LINE, pcBasedDebugInfo.getParameterCount(), instructions, factory);
   }

   public static EventBasedDebugInfo createEventBasedDebugInfoForNativePc(
       int parameterCount, DexCode code, DexItemFactory factory) {
     assert code.getDebugInfo() == null;
     return forceConvertToEventBasedDebugInfo(0, parameterCount, code.instructions, factory);
   }

   private static EventBasedDebugInfo forceConvertToEventBasedDebugInfo(
       int startLine, int parameterCount, DexInstruction[] instructions, DexItemFactory factory) {
     List<DexDebugEvent> events = new ArrayList<>(instructions.length);
     int delta = 0;
     for (DexInstruction instruction : instructions) {
       if (instruction.canThrow()) {
         DexDebugEventBuilder.addDefaultEventWithAdvancePcIfNecessary(delta, delta, events, factory);
         delta = 0;
       }
       delta += instruction.getSize();
     }
     return new EventBasedDebugInfo(
         startLine, new DexString[parameterCount], events.toArray(DexDebugEvent.EMPTY_ARRAY));
   }

   public static DexDebugInfoForWriting convertToWritable(DexDebugInfo debugInfo) {
     if (debugInfo == null) {
       return null;
     }
     if (debugInfo.isPcBasedInfo()) {
       return debugInfo.asPcBasedInfo();
     }
     EventBasedDebugInfo eventBasedInfo = debugInfo.asEventBasedInfo();
     DexDebugEvent[] writableEvents =
         ArrayUtils.filter(
             eventBasedInfo.events, DexDebugEvent::isWritableEvent, DexDebugEvent.EMPTY_ARRAY);
     return new WritableEventBasedDebugInfo(
         eventBasedInfo.startLine, eventBasedInfo.parameters, writableEvents);
   }

   private static class WritableEventBasedDebugInfo extends EventBasedDebugInfo
       implements DexDebugInfoForWriting {

     private WritableEventBasedDebugInfo(
         int startLine, DexString[] parameters, DexDebugEvent[] writableEvents) {
       super(startLine, parameters, writableEvents);
     }

     @Override
     public void collectIndexedItems(
         AppView<?> appView, GraphLens codeLens, IndexedItemCollection indexedItems) {
       super.collectIndexedItems(appView, codeLens, indexedItems);
     }

     @Override
     public void collectMixedSectionItems(MixedSectionCollection collection) {
       assert verifySetPositionFramesFollowedByDefaultEvent(this);
       collection.add(this);
     }

     @Override
     public int estimatedWriteSize() {
       return LebUtils.sizeAsUleb128(startLine)
           + LebUtils.sizeAsUleb128(parameters.length)
           // Estimate 4 bytes per parameter pointer.
           + parameters.length * 4
           + events.length
           + 1;
     }

     @Override
     public void write(
         DebugBytecodeWriter writer,
         ObjectToOffsetMapping mapping,
         GraphLens graphLens,
         GraphLens codeLens) {
       writer.putUleb128(startLine);
       writer.putUleb128(parameters.length);
       for (DexString name : parameters) {
         writer.putString(name);
       }
       for (DexDebugEvent event : events) {
         event.writeOn(writer, mapping, graphLens, codeLens);
       }
       writer.putByte(Constants.DBG_END_SEQUENCE);
     }
   }
 }
	// Copyright (c) 2016, the R8 project authors. Please see the AUTHORS file
	// for details. All rights reserved. Use of this source code is governed by a
	// BSD-style license that can be found in the LICENSE file.
	package com.android.tools.r8.graph;

	import static com.android.tools.r8.utils.DexDebugUtils.verifySetPositionFramesFollowedByDefaultEvent;

	import com.android.tools.r8.debuginfo.DebugRepresentation;
	import com.android.tools.r8.dex.Constants;
	import com.android.tools.r8.dex.DebugBytecodeWriter;
	import com.android.tools.r8.dex.IndexedItemCollection;
	import com.android.tools.r8.dex.MixedSectionCollection;
	import com.android.tools.r8.dex.code.DexInstruction;
	import com.android.tools.r8.errors.Unreachable;
	import com.android.tools.r8.graph.lens.GraphLens;
	import com.android.tools.r8.utils.ArrayUtils;
	import com.android.tools.r8.utils.LebUtils;
	import com.android.tools.r8.utils.StringUtils;
	import com.android.tools.r8.utils.structural.CompareToVisitor;
	import com.android.tools.r8.utils.structural.Equatable;
	import com.android.tools.r8.utils.structural.HashingVisitor;
	import com.android.tools.r8.utils.structural.StructuralItem;
	import com.android.tools.r8.utils.structural.StructuralMapping;
	import com.android.tools.r8.utils.structural.StructuralSpecification;
	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.List;
	import java.util.Objects;

	public abstract class DexDebugInfo extends CachedHashValueDexItem
	implements StructuralItem<DexDebugInfo> {

	private enum DebugInfoKind {
	EVENT_BASED,
	PC_BASED
	}

	abstract DebugInfoKind getKind();

	abstract int internalAcceptCompareTo(DexDebugInfo other, CompareToVisitor visitor);

	public abstract int getStartLine();

	public abstract int getParameterCount();

	public boolean isEventBasedInfo() {
	return getKind() == DebugInfoKind.EVENT_BASED;
	}

	public boolean isPcBasedInfo() {
	return getKind() == DebugInfoKind.PC_BASED;
	}

	public EventBasedDebugInfo asEventBasedInfo() {
	return null;
	}

	public PcBasedDebugInfo asPcBasedInfo() {
	return null;
	}

	@Override
	protected abstract void collectMixedSectionItems(MixedSectionCollection collection);

	@Override
	public abstract DexDebugInfo self();

	@Override
	public StructuralMapping<DexDebugInfo> getStructuralMapping() {
	throw new Unreachable();
	}

	@Override
	public abstract void acceptHashing(HashingVisitor visitor);

	@Override
	public int acceptCompareTo(DexDebugInfo other, CompareToVisitor visitor) {
	int diff = visitor.visitInt(getKind().ordinal(), other.getKind().ordinal());
	if (diff != 0) {
	return diff;
	}
	return internalAcceptCompareTo(other, visitor);
	}

	@Override
	protected final boolean computeEquals(Object other) {
	return Equatable.equalsImpl(this, other);
	}

	public static class PcBasedDebugInfo extends DexDebugInfo implements DexDebugInfoForWriting {
	public static final int START_LINE = 1;
	private final int parameterCount;
	private final int maxPc;

	private static void specify(StructuralSpecification<PcBasedDebugInfo, ?> spec) {
	spec.withInt(d -> d.parameterCount).withInt(d -> d.maxPc);
	}

	public PcBasedDebugInfo(int parameterCount, int maxPc) {
	this.parameterCount = parameterCount;
	this.maxPc = maxPc;
	}

	public int getMaxPc() {
	return maxPc;
	}

	@Override
	public int getStartLine() {
	return START_LINE;
	}

	@Override
	public int getParameterCount() {
	return parameterCount;
	}

	@Override
	public DexDebugInfo self() {
	return this;
	}

	@Override
	public PcBasedDebugInfo asPcBasedInfo() {
	return this;
	}

	@Override
	DebugInfoKind getKind() {
	return DebugInfoKind.PC_BASED;
	}

	@Override
	protected int computeHashCode() {
	return Objects.hash(parameterCount, maxPc);
	}

	@Override
	public void acceptHashing(HashingVisitor visitor) {
	visitor.visit(this, PcBasedDebugInfo::specify);
	}

	@Override
	int internalAcceptCompareTo(DexDebugInfo other, CompareToVisitor visitor) {
	assert other.isPcBasedInfo();
	return visitor.visit(this, other.asPcBasedInfo(), PcBasedDebugInfo::specify);
	}

	@Override
	public void collectMixedSectionItems(MixedSectionCollection collection) {
	collection.add(this);
	}

	@Override
	public void collectIndexedItems(
	AppView<?> appView, GraphLens codeLens, IndexedItemCollection indexedItems) {
	// No indexed items to collect.
	}

	public static int estimatedWriteSize(int parameterCount, int maxPc) {
	return LebUtils.sizeAsUleb128(START_LINE)
	+ LebUtils.sizeAsUleb128(parameterCount)
	+ parameterCount * LebUtils.sizeAsUleb128(0)
	+ 1
	+ maxPc
	+ 1;
	}

	@Override
	public int estimatedWriteSize() {
	return estimatedWriteSize(parameterCount, maxPc);
	}

	@Override
	public void write(
	DebugBytecodeWriter writer,
	ObjectToOffsetMapping mapping,
	GraphLens graphLens,
	GraphLens codeLens) {
	writer.putUleb128(START_LINE);
	writer.putUleb128(parameterCount);
	for (int i = 0; i < parameterCount; i++) {
	writer.putString(null);
	}
	mapping.dexItemFactory().zeroChangeDefaultEvent.writeOn(writer, mapping, graphLens, codeLens);
	for (int i = 0; i < maxPc; i++) {
	mapping
	.dexItemFactory()
	.oneChangeDefaultEvent
	.writeOn(writer, mapping, graphLens, codeLens);
	}
	writer.putByte(Constants.DBG_END_SEQUENCE);
	}

	@Override
	public String toString() {
	return "PcBasedDebugInfo (params: "
	+ parameterCount
	+ ", max-pc: "
	+ StringUtils.hexString(maxPc, 2)
	+ ")";
	}
	}

	public static class EventBasedDebugInfo extends DexDebugInfo {

	public final int startLine;
	public final DexString[] parameters;
	public DexDebugEvent[] events;

	private static void specify(StructuralSpecification<EventBasedDebugInfo, ?> spec) {
	spec.withInt(d -> d.startLine)
	.withItemArrayAllowingNullMembers(d -> d.parameters)
	.withItemArray(d -> d.events);
	}

	public EventBasedDebugInfo(int startLine, DexString[] parameters, DexDebugEvent[] events) {
	assert startLine >= 0;
	this.startLine = startLine;
	this.parameters = parameters;
	this.events = events;
	}

	@Override
	public DexDebugInfo self() {
	return this;
	}

	@Override
	public EventBasedDebugInfo asEventBasedInfo() {
	return this;
	}

	@Override
	DebugInfoKind getKind() {
	return DebugInfoKind.EVENT_BASED;
	}

	@Override
	public int getStartLine() {
	return startLine;
	}

	@Override
	public int getParameterCount() {
	return parameters.length;
	}

	public List<DexDebugEntry> computeEntries(DexMethod method, boolean isD8R8Synthesized) {
	DexDebugEntryBuilder builder = new DexDebugEntryBuilder(method, isD8R8Synthesized, startLine);
	for (DexDebugEvent event : events) {
	event.accept(builder);
	}
	return builder.build();
	}

	@Override
	public int computeHashCode() {
	return startLine + Arrays.hashCode(parameters) * 7 + Arrays.hashCode(events) * 13;
	}

	@Override
	public void acceptHashing(HashingVisitor visitor) {
	visitor.visit(this, EventBasedDebugInfo::specify);
	}

	@Override
	int internalAcceptCompareTo(DexDebugInfo other, CompareToVisitor visitor) {
	assert other.isEventBasedInfo();
	return visitor.visit(this, other.asEventBasedInfo(), EventBasedDebugInfo::specify);
	}

	public void collectIndexedItems(
	AppView<?> appView, GraphLens codeLens, IndexedItemCollection indexedItems) {
	for (DexString parameter : parameters) {
	if (parameter != null) {
	parameter.collectIndexedItems(indexedItems);
	}
	}
	for (DexDebugEvent event : events) {
	event.collectIndexedItems(appView, codeLens, indexedItems);
	}
	}

	@Override
	protected void collectMixedSectionItems(MixedSectionCollection collection) {
	// Only writable info should be iterated for collection.
	throw new Unreachable();
	}

	@Override
	public String toString() {
	StringBuilder builder = new StringBuilder();
	builder.append("DebugInfo (line " + startLine + ") events: [\n");
	for (DexDebugEvent event : events) {
	builder.append(" ").append(event).append("\n");
	}
	builder.append(" END_SEQUENCE\n");
	builder.append("]\n");
	return builder.toString();
	}
	}

	public static EventBasedDebugInfo createEventBasedInfoForMethodWithoutDebugInfo(
	DexEncodedMethod method, DexItemFactory factory) {
	return new EventBasedDebugInfo(
	0,
	new DexString[method.getParameters().size()],
	new DexDebugEvent[] {factory.zeroChangeDefaultEvent});
	}

	public static EventBasedDebugInfo convertToEventBased(DexCode code, DexItemFactory factory) {
	if (code.getDebugInfo() == null) {
	return null;
	}
	if (code.getDebugInfo().isEventBasedInfo()) {
	return code.getDebugInfo().asEventBasedInfo();
	}
	assert code.getDebugInfo().isPcBasedInfo();
	PcBasedDebugInfo pcBasedDebugInfo = code.getDebugInfo().asPcBasedInfo();
	assert DebugRepresentation.verifyLastExecutableInstructionWithinBound(
	code, pcBasedDebugInfo.maxPc);
	// Generate a line event at each throwing instruction.
	DexInstruction[] instructions = code.instructions;
	return forceConvertToEventBasedDebugInfo(
	PcBasedDebugInfo.START_LINE, pcBasedDebugInfo.getParameterCount(), instructions, factory);
	}

	public static EventBasedDebugInfo createEventBasedDebugInfoForNativePc(
	int parameterCount, DexCode code, DexItemFactory factory) {
	assert code.getDebugInfo() == null;
	return forceConvertToEventBasedDebugInfo(0, parameterCount, code.instructions, factory);
	}

	private static EventBasedDebugInfo forceConvertToEventBasedDebugInfo(
	int startLine, int parameterCount, DexInstruction[] instructions, DexItemFactory factory) {
	List<DexDebugEvent> events = new ArrayList<>(instructions.length);
	int delta = 0;
	for (DexInstruction instruction : instructions) {
	if (instruction.canThrow()) {
	DexDebugEventBuilder.addDefaultEventWithAdvancePcIfNecessary(delta, delta, events, factory);
	delta = 0;
	}
	delta += instruction.getSize();
	}
	return new EventBasedDebugInfo(
	startLine, new DexString[parameterCount], events.toArray(DexDebugEvent.EMPTY_ARRAY));
	}

	public static DexDebugInfoForWriting convertToWritable(DexDebugInfo debugInfo) {
	if (debugInfo == null) {
	return null;
	}
	if (debugInfo.isPcBasedInfo()) {
	return debugInfo.asPcBasedInfo();
	}
	EventBasedDebugInfo eventBasedInfo = debugInfo.asEventBasedInfo();
	DexDebugEvent[] writableEvents =
	ArrayUtils.filter(
	eventBasedInfo.events, DexDebugEvent::isWritableEvent, DexDebugEvent.EMPTY_ARRAY);
	return new WritableEventBasedDebugInfo(
	eventBasedInfo.startLine, eventBasedInfo.parameters, writableEvents);
	}

	private static class WritableEventBasedDebugInfo extends EventBasedDebugInfo
	implements DexDebugInfoForWriting {

	private WritableEventBasedDebugInfo(
	int startLine, DexString[] parameters, DexDebugEvent[] writableEvents) {
	super(startLine, parameters, writableEvents);
	}

	@Override
	public void collectIndexedItems(
	AppView<?> appView, GraphLens codeLens, IndexedItemCollection indexedItems) {
	super.collectIndexedItems(appView, codeLens, indexedItems);
	}

	@Override
	public void collectMixedSectionItems(MixedSectionCollection collection) {
	assert verifySetPositionFramesFollowedByDefaultEvent(this);
	collection.add(this);
	}

	@Override
	public int estimatedWriteSize() {
	return LebUtils.sizeAsUleb128(startLine)
	+ LebUtils.sizeAsUleb128(parameters.length)
	// Estimate 4 bytes per parameter pointer.
	+ parameters.length * 4
	+ events.length
	+ 1;
	}

	@Override
	public void write(
	DebugBytecodeWriter writer,
	ObjectToOffsetMapping mapping,
	GraphLens graphLens,
	GraphLens codeLens) {
	writer.putUleb128(startLine);
	writer.putUleb128(parameters.length);
	for (DexString name : parameters) {
	writer.putString(name);
	}
	for (DexDebugEvent event : events) {
	event.writeOn(writer, mapping, graphLens, codeLens);
	}
	writer.putByte(Constants.DBG_END_SEQUENCE);
	}
	}
	}