1 // Copyright (c) 2016, the R8 project authors. Please see the AUTHORS file 2 // for details. All rights reserved. Use of this source code is governed by a 3 // BSD-style license that can be found in the LICENSE file. 4 package com.android.tools.r8.utils; 5 6 import java.util.Stack; 7 8 /** 9 * Printer abstraction for creating flow-graphs for the C1 visualizer. 10 */ 11 public class CfgPrinter { 12 13 private final StringBuilder builder = new StringBuilder(); 14 private final Stack<String> opened = new Stack<>(); 15 private final int indentSpacing = 2; 16 17 public int nextUnusedValue = 0; 18 makeUnusedValue()19 public String makeUnusedValue() { 20 return "_" + nextUnusedValue++; 21 } 22 resetUnusedValue()23 public void resetUnusedValue() { 24 nextUnusedValue = 0; 25 } 26 begin(String title)27 public CfgPrinter begin(String title) { 28 print("begin_"); 29 append(title).ln(); 30 opened.push(title); 31 return this; 32 } 33 end(String title)34 public CfgPrinter end(String title) { 35 String top = opened.pop(); 36 assert title.equals(top); 37 print("end_"); 38 append(title).ln(); 39 return this; 40 } 41 print(int i)42 public CfgPrinter print(int i) { 43 printIndent(); 44 builder.append(i); 45 return this; 46 } 47 print(String string)48 public CfgPrinter print(String string) { 49 printIndent(); 50 builder.append(string); 51 return this; 52 } 53 append(int i)54 public CfgPrinter append(int i) { 55 builder.append(i); 56 return this; 57 } 58 append(String string)59 public CfgPrinter append(String string) { 60 builder.append(string); 61 return this; 62 } 63 sp()64 public CfgPrinter sp() { 65 builder.append(" "); 66 return this; 67 } 68 ln()69 public CfgPrinter ln() { 70 builder.append("\n"); 71 return this; 72 } 73 printIndent()74 private void printIndent() { 75 for (int i = 0; i < opened.size() * indentSpacing; i++) { 76 builder.append(" "); 77 } 78 } 79 80 @Override toString()81 public String toString() { 82 return builder.toString(); 83 } 84 } 85