Mercurial > hg > truffle

changeset 20892:2818f2862a0d

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Use increasingly big arrays to avoid wasting space when writing few bytes
author Christian Wimmer <christian.wimmer@oracle.com>
date Sat, 11 Apr 2015 00:12:10 -0700
parents 129a09815063
children d689979bf956
files graal/com.oracle.graal.compiler.common/src/com/oracle/graal/compiler/common/util/UnsafeArrayTypeWriter.java
diffstat 1 files changed, 9 insertions(+), 4 deletions(-) [+]
line wrap: on
line diff
--- a/graal/com.oracle.graal.compiler.common/src/com/oracle/graal/compiler/common/util/UnsafeArrayTypeWriter.java	Fri Apr 10 21:53:38 2015 -0700
+++ b/graal/com.oracle.graal.compiler.common/src/com/oracle/graal/compiler/common/util/UnsafeArrayTypeWriter.java	Sat Apr 11 00:12:10 2015 -0700
@@ -37,12 +37,17 @@
  */
 public class UnsafeArrayTypeWriter implements TypeWriter {
 
-    private static final int CHUNK_SIZE = 4000;
+    private static final int MIN_CHUNK_LENGTH = 200;
+    private static final int MAX_CHUNK_LENGTH = 16000;
 
     static class Chunk {
-        protected final byte[] data = new byte[CHUNK_SIZE];
+        protected final byte[] data;
         protected int size;
         protected Chunk next;
+
+        protected Chunk(int arrayLength) {
+            data = new byte[arrayLength];
+        }
     }
 
     private Chunk firstChunk;
@@ -50,7 +55,7 @@
     private int totalSize;
 
     public UnsafeArrayTypeWriter() {
-        firstChunk = new Chunk();
+        firstChunk = new Chunk(MIN_CHUNK_LENGTH);
         writeChunk = firstChunk;
     }
 
@@ -153,7 +158,7 @@
 
     private long writeOffset(int writeBytes) {
         if (writeChunk.size + writeBytes >= writeChunk.data.length) {
-            Chunk newChunk = new Chunk();
+            Chunk newChunk = new Chunk(Math.min(writeChunk.data.length * 2, MAX_CHUNK_LENGTH));
             writeChunk.next = newChunk;
             writeChunk = newChunk;
         }