Revert 17963, 17962 and 17955: Random number generator in JS changes

src/hydrogen.cc

 // Copyright 2013 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 7471 matching lines @@
           }
         }
 
         if (result == NULL) {
           result = NewUncasted<HPower>(left, right);
         }
         ast_context()->ReturnInstruction(result, expr->id());
         return true;
       }
       break;
+    case kMathRandom:
+      if (argument_count == 1 && check_type == RECEIVER_MAP_CHECK) {
+        AddCheckConstantFunction(expr->holder(), receiver, receiver_map);
+        Drop(1);  // Receiver.
+        HGlobalObject* global_object = Add<HGlobalObject>();
+        HRandom* result = New<HRandom>(global_object);
+        ast_context()->ReturnInstruction(result, expr->id());
+        return true;
+      }
+      break;
     case kMathMax:
     case kMathMin:
       if (argument_count == 3 && check_type == RECEIVER_MAP_CHECK) {
         AddCheckConstantFunction(expr->holder(), receiver, receiver_map);
         HValue* right = Pop();
         HValue* left = Pop();
         Drop(1);  // Receiver.
         HMathMinMax::Operation op = (id == kMathMin) ? HMathMinMax::kMathMin
                                                      : HMathMinMax::kMathMax;
         HInstruction* result = NewUncasted<HMathMinMax>(left, right, op);
@@ skipping 2354 matching lines @@
   return ast_context()->ReturnControl(result, call->id());
 }
 
 
 void HOptimizedGraphBuilder::GenerateLog(CallRuntime* call) {
   // %_Log is ignored in optimized code.
   return ast_context()->ReturnValue(graph()->GetConstantUndefined());
 }
 
 
+// Fast support for Math.random().
+void HOptimizedGraphBuilder::GenerateRandomHeapNumber(CallRuntime* call) {
+  HGlobalObject* global_object = Add<HGlobalObject>();
+  HRandom* result = New<HRandom>(global_object);
+  return ast_context()->ReturnInstruction(result, call->id());
+}
+
+
 // Fast support for StringAdd.
 void HOptimizedGraphBuilder::GenerateStringAdd(CallRuntime* call) {
   ASSERT_EQ(2, call->arguments()->length());
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   CHECK_ALIVE(VisitForValue(call->arguments()->at(1)));
   HValue* right = Pop();
   HValue* left = Pop();
   HInstruction* result = New<HStringAdd>(left, right, STRING_ADD_CHECK_BOTH);
   return ast_context()->ReturnInstruction(result, call->id());
 }
@@ skipping 776 matching lines @@
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 } }  // namespace v8::internal