Liveness analysis for environment slots in Hydrogen

test/mjsunit/debug-evaluate-locals-optimized.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 156 matching lines @@
 %OptimizeFunctionOnNextCall(f);
 f(expected.length - 1, 11, 12);
 
 // Add the debug event listener.
 Debug.setListener(listener);
 
 function h(i, x0, y0) {
   var a0 = expected[i].locals.a0;
   var b0 = expected[i].locals.b0;
   debugger;  // Breakpoint.
+  return a0 + b0;
 }
 
 function g3(i, x1, y1) {
   var a1 = expected[i].locals.a1;
   var b1 = expected[i].locals.b1;
   h(i - 1, a1, b1);
+  return a1 + b1;
 }
 
 function g2(i) {
   var a2 = expected[i].locals.a2;
   var b2 = expected[i].locals.b2;
   g3(i - 1, a2, b2);
+  return a2 + b2;
 }
 
 function g1(i, x3, y3, z3) {
   var a3 = expected[i].locals.a3;
   var b3 = expected[i].locals.b3;
   new g2(i - 1, a3, b3);
+  return a3 + b3;
 }
 
 function f(i, x4, y4) {
   var a4 = expected[i].locals.a4;
   var b4 = expected[i].locals.b4;
   g1(i - 1, a4, b4);
+  return a4 + b4;
 }
 
 // Test calling f normally and as a constructor.
 f(expected.length - 1, 11, 12);
 f(expected.length - 1, 11, 12, 0);
 testingConstructCall = true;
 new f(expected.length - 1, 11, 12);
 new f(expected.length - 1, 11, 12, 0);
 
 // 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);