From d7c5ad7d6263fd1baf9bfdbaa4c50b70ef2fbdb2 Mon Sep 17 00:00:00 2001
From: Alexander Sulfrian <alexander@sulfrian.net>
Date: Tue, 8 Jun 2010 08:22:05 +0200
Subject: reverted folder structure change for better mergeing with upstream

---
 .../javascript/optimizer/OptTransformer.java       | 133 +++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 trunk/infrastructure/rhino1_7R1/src/org/mozilla/javascript/optimizer/OptTransformer.java

(limited to 'trunk/infrastructure/rhino1_7R1/src/org/mozilla/javascript/optimizer/OptTransformer.java')

diff --git a/trunk/infrastructure/rhino1_7R1/src/org/mozilla/javascript/optimizer/OptTransformer.java b/trunk/infrastructure/rhino1_7R1/src/org/mozilla/javascript/optimizer/OptTransformer.java
new file mode 100644
index 0000000..7cf679f
--- /dev/null
+++ b/trunk/infrastructure/rhino1_7R1/src/org/mozilla/javascript/optimizer/OptTransformer.java
@@ -0,0 +1,133 @@
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Rhino code, released
+ * May 6, 1999.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1997-1999
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Norris Boyd
+ *   Roger Lawrence
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * the GNU General Public License Version 2 or later (the "GPL"), in which
+ * case the provisions of the GPL are applicable instead of those above. If
+ * you wish to allow use of your version of this file only under the terms of
+ * the GPL and not to allow others to use your version of this file under the
+ * MPL, indicate your decision by deleting the provisions above and replacing
+ * them with the notice and other provisions required by the GPL. If you do
+ * not delete the provisions above, a recipient may use your version of this
+ * file under either the MPL or the GPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+
+package org.mozilla.javascript.optimizer;
+
+import org.mozilla.javascript.*;
+import java.util.Hashtable;
+
+/**
+ * This class performs node transforms to prepare for optimization.
+ *
+ * @see NodeTransformer
+ * @author Norris Boyd
+ */
+
+class OptTransformer extends NodeTransformer {
+
+    OptTransformer(Hashtable possibleDirectCalls, ObjArray directCallTargets)
+    {
+        this.possibleDirectCalls = possibleDirectCalls;
+        this.directCallTargets = directCallTargets;
+    }
+
+    protected void visitNew(Node node, ScriptOrFnNode tree) {
+        detectDirectCall(node, tree);
+        super.visitNew(node, tree);
+    }
+
+    protected void visitCall(Node node, ScriptOrFnNode tree) {
+        detectDirectCall(node, tree);
+        super.visitCall(node, tree);
+    }
+
+    private void detectDirectCall(Node node, ScriptOrFnNode tree)
+    {
+        if (tree.getType() == Token.FUNCTION) {
+            Node left = node.getFirstChild();
+
+            // count the arguments
+            int argCount = 0;
+            Node arg = left.getNext();
+            while (arg != null) {
+                arg = arg.getNext();
+                argCount++;
+            }
+
+            if (argCount == 0) {
+                OptFunctionNode.get(tree).itsContainsCalls0 = true;
+            }
+
+            /*
+             * Optimize a call site by converting call("a", b, c) into :
+             *
+             *  FunctionObjectFor"a" <-- instance variable init'd by constructor
+             *
+             *  // this is a DIRECTCALL node
+             *  fn = GetProp(tmp = GetBase("a"), "a");
+             *  if (fn == FunctionObjectFor"a")
+             *      fn.call(tmp, b, c)
+             *  else
+             *      ScriptRuntime.Call(fn, tmp, b, c)
+             */
+            if (possibleDirectCalls != null) {
+                String targetName = null;
+                if (left.getType() == Token.NAME) {
+                    targetName = left.getString();
+                } else if (left.getType() == Token.GETPROP) {
+                    targetName = left.getFirstChild().getNext().getString();
+                } else if (left.getType() == Token.GETPROPNOWARN) {
+                    throw Kit.codeBug();
+                }
+                if (targetName != null) {
+                    OptFunctionNode ofn;
+                    ofn = (OptFunctionNode)possibleDirectCalls.get(targetName);
+                    if (ofn != null
+                        && argCount == ofn.fnode.getParamCount()
+                        && !ofn.fnode.requiresActivation())
+                    {
+                        // Refuse to directCall any function with more
+                        // than 32 parameters - prevent code explosion
+                        // for wacky test cases
+                        if (argCount <= 32) {
+                            node.putProp(Node.DIRECTCALL_PROP, ofn);
+                            if (!ofn.isTargetOfDirectCall()) {
+                                int index = directCallTargets.size();
+                                directCallTargets.add(ofn);
+                                ofn.setDirectTargetIndex(index);
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    private Hashtable possibleDirectCalls;
+    private ObjArray directCallTargets;
+}
-- 
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