Liveness analysis for environment slots in Hydrogen

test/mjsunit/debug-evaluate-locals-optimized-double.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 167 matching lines @@
 
 // Add the debug event listener.
 Debug.setListener(listener);
 
 function h(i, x0, y0) {
   var a0 = input[i].a;
   var b0 = input[i].b;
   a0 = a0 + a0 / 100;
   b0 = b0 + b0 / 100;
   debugger;  // Breakpoint.
+  return a0 + b0;
 };
 
 function g3(i, x1, y1) {
   var a1 = input[i].a;
   var b1 = input[i].b;
   a1 = a1 + a1 / 100;
   b1 = b1 + b1 / 100;
   h(i - 1, a1, b1);
-  return a1+b1;
+  return a1 + b1;
 };
 
 function g2(i) {
   var a2 = input[i].a;
   var b2 = input[i].b;
   a2 = a2 + a2 / 100;
   b2 = b2 + b2 / 100;
   g3(i - 1, a2, b2);
+  return a2 + b2;
 };
 
 function g1(i, x3, y3, z3) {
   var a3 = input[i].a;
   var b3 = input[i].b;
   a3 = a3 + a3 / 100;
   b3 = b3 + b3 / 100;
   new g2(i - 1, a3, b3);
+  return a3 + b3;
 };
 
 function f(i, x4, y4) {
   var a4 = input[i].a;
   var b4 = input[i].b;
   a4 = a4 + a4 / 100;
   b4 = b4 + b4 / 100;
   g1(i - 1, a4, b4);
+  return a4 + b4;
 };
 
 // Test calling f normally and as a constructor.
 f(input.length - 1, 11.11, 12.12);
 f(input.length - 1, 11.11, 12.12, "");
 testingConstructCall = true;
 new f(input.length - 1, 11.11, 12.12);
 new f(input.length - 1, 11.11, 12.12, "");
 
 // Make sure that the debug event listener was invoked.
 assertFalse(exception, "exception in listener " + exception)
 assertTrue(listenerComplete);
 
 //Throw away type information for next run.
 gc();
 
 Debug.setListener(null);