src/main/java/com/android/tools/r8/graph/CfCode.java

// Copyright (c) 2017, 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 com.android.tools.r8.ApiLevelException;
import com.android.tools.r8.cf.code.CfInstruction;
import com.android.tools.r8.cf.code.CfTryCatch;
import com.android.tools.r8.errors.Unimplemented;
import com.android.tools.r8.ir.code.IRCode;
import com.android.tools.r8.naming.ClassNameMapper;
import com.android.tools.r8.utils.InternalOptions;
import java.util.List;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Type;

public class CfCode extends Code {

  private final int maxStack;
  private final int maxLocals;
  private final List<CfInstruction> instructions;
  private final List<CfTryCatch> tryCatchRanges;

  public CfCode(
      int maxStack,
      int maxLocals,
      List<CfInstruction> instructions,
      List<CfTryCatch> tryCatchRanges) {
    this.maxStack = maxStack;
    this.maxLocals = maxLocals;
    this.instructions = instructions;
    this.tryCatchRanges = tryCatchRanges;
  }

  @Override
  public boolean isCfCode() {
    return true;
  }

  @Override
  public CfCode asCfCode() {
    return this;
  }

  public void write(MethodVisitor visitor) {
    for (CfInstruction instruction : instructions) {
      instruction.write(visitor);
    }
    visitor.visitEnd();
    visitor.visitMaxs(maxStack, maxLocals);
    for (CfTryCatch tryCatch : tryCatchRanges) {
      Label start = tryCatch.start.getLabel();
      Label end = tryCatch.end.getLabel();
      for (int i = 0; i < tryCatch.guards.size(); i++) {
        DexType guard = tryCatch.guards.get(i);
        Label target = tryCatch.targets.get(i).getLabel();
        visitor.visitTryCatchBlock(
            start,
            end,
            target,
            guard == DexItemFactory.catchAllType
                ? null
                : Type.getType(guard.toDescriptorString()).getInternalName());
      }
    }
  }

  @Override
  protected int computeHashCode() {
    throw new Unimplemented();
  }

  @Override
  protected boolean computeEquals(Object other) {
    throw new Unimplemented();
  }

  @Override
  public IRCode buildIR(DexEncodedMethod encodedMethod, InternalOptions options)
      throws ApiLevelException {
    throw new Unimplemented("Converting Java class- file bytecode to IR not yet supported");
  }

  @Override
  public void registerReachableDefinitions(UseRegistry registry) {
    throw new Unimplemented("Inspecting Java class-file bytecode not yet supported");
  }

  @Override
  public String toString() {
    StringBuilder builder = new StringBuilder();
    for (CfInstruction instruction : instructions) {
      builder.append(instruction.toString()).append('\n');
    }
    return builder.toString();
  }

  @Override
  public String toString(DexEncodedMethod method, ClassNameMapper naming) {
    return null;
  }
}