decompiler: create less thrown away objects

src/org/jetbrains/java/decompiler/code/cfg/BasicBlock.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2014 JetBrains s.r.o.
+ * Copyright 2000-2015 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -44,16 +44,12 @@ public class BasicBlock implements IGraphNode {
 
   private List<BasicBlock> succs = new ArrayList<BasicBlock>();
 
-  private List<Integer> instrOldOffsets = new ArrayList<Integer>();
+  private final List<Integer> instrOldOffsets = new ArrayList<Integer>();
 
   private List<BasicBlock> predExceptions = new ArrayList<BasicBlock>();
 
   private List<BasicBlock> succExceptions = new ArrayList<BasicBlock>();
 
-
-  public BasicBlock() {
-  }
-
   public BasicBlock(int id) {
     this.id = id;
   }
@@ -63,11 +59,10 @@ public class BasicBlock implements IGraphNode {
   // *****************************************************************************
 
   public Object clone() {
+    BasicBlock block = new BasicBlock(id);
 
-    BasicBlock block = new BasicBlock();
-    block.id = id;
     block.setSeq(seq.clone());
-    block.setInstrOldOffsets(new ArrayList<Integer>(instrOldOffsets));
+    block.instrOldOffsets.addAll(instrOldOffsets);
 
     return block;
   }
@@ -220,10 +215,6 @@ public class BasicBlock implements IGraphNode {
     return instrOldOffsets;
   }
 
-  public void setInstrOldOffsets(List<Integer> instrInds) {
-    this.instrOldOffsets = instrInds;
-  }
-
   public List<? extends IGraphNode> getPredecessors() {
     List<BasicBlock> lst = new ArrayList<BasicBlock>(preds);
     lst.addAll(predExceptions);

src/org/jetbrains/java/decompiler/code/cfg/ControlFlowGraph.java

@@ -296,7 +296,7 @@ public class ControlFlowGraph implements CodeConstants {
     VBStyleCollection<BasicBlock, Integer> col = new VBStyleCollection<BasicBlock, Integer>();
 
     InstructionSequence currseq = null;
-    ArrayList<Integer> lstOffs = null;
+    List<Integer> lstOffs = null;
 
     int len = startblock.length;
     short counter = 0;
@@ -306,14 +306,11 @@ public class ControlFlowGraph implements CodeConstants {
     for (int i = 0; i < len; i++) {
 
       if (startblock[i] == 1) {
-        currentBlock = new BasicBlock();
-        currentBlock.id = ++counter;
+        currentBlock = new BasicBlock(++counter);
 
-        currseq = new SimpleInstructionSequence();
-        lstOffs = new ArrayList<Integer>();
+        currseq = currentBlock.getSeq();
+        lstOffs = currentBlock.getInstrOldOffsets();
 
-        currentBlock.setSeq(currseq);
-        currentBlock.setInstrOldOffsets(lstOffs);
         col.addWithKey(currentBlock, currentBlock.id);
 
         blockoffset = instrseq.getOffset(i);
@@ -766,9 +763,7 @@ public class ControlFlowGraph implements CodeConstants {
 
     first = blocks.get(0);
 
-    last = new BasicBlock();
-    last.id = ++last_id;
-    last.setSeq(new SimpleInstructionSequence());
+    last = new BasicBlock(++last_id);
 
     for (BasicBlock block : blocks) {
       if (block.getSuccs().isEmpty()) {

src/org/jetbrains/java/decompiler/modules/decompiler/FinallyProcessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2014 JetBrains s.r.o.
+ * Copyright 2000-2015 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -1038,7 +1038,7 @@ public class FinallyProcessor {
 
       // new empty block
       BasicBlock emptyblock = new BasicBlock(++graph.last_id);
-      emptyblock.setSeq(new SimpleInstructionSequence());
+
       graph.getBlocks().addWithKey(emptyblock, emptyblock.id);
 
       // add to ranges if necessary