* String type inference using compiler framework.

src/virtual-frame-ia32.cc

 // Copyright 2009 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 173 matching lines @@
     FrameElement target = expected->elements_[i];
     if (source.is_synced() && !target.is_synced()) {
       elements_[i].clear_sync();
     } else if (!source.is_synced() && target.is_synced()) {
       SyncElementAt(i);
     }
     elements_[i].clear_copied();
     if (elements_[i].is_copy()) {
       elements_[elements_[i].index()].set_copied();
     }
+    elements_[i].set_static_type(target.static_type());
   }
 
-  // Adjust the stack point downard if necessary.
+  // Adjust the stack pointer downward if necessary.
   if (stack_pointer_ > expected->stack_pointer_) {
     int difference = stack_pointer_ - expected->stack_pointer_;
     stack_pointer_ = expected->stack_pointer_;
     __ add(Operand(esp), Immediate(difference * kPointerSize));
   }
 
   // At this point, the frames should be identical.
   ASSERT(Equals(expected));
 }
 
@@ skipping 736 matching lines @@
   FrameElement element = elements_.RemoveLast();
   int index = elements_.length();
   ASSERT(element.is_valid());
 
   bool pop_needed = (stack_pointer_ == index);
   if (pop_needed) {
     stack_pointer_--;
     if (element.is_memory()) {
       Result temp = cgen_->allocator()->Allocate();
       ASSERT(temp.is_valid());
+      temp.set_static_type(element.static_type());
       __ pop(temp.reg());
       return temp;
     }
 
     __ add(Operand(esp), Immediate(kPointerSize));
   }
   ASSERT(!element.is_memory());
 
   // The top element is a register, constant, or a copy.  Unuse
   // registers and follow copies to their backing store.
@@ skipping 11 matching lines @@
     // Memory elements could only be the backing store of a copy.
     // Allocate the original to a register.
     ASSERT(index <= stack_pointer_);
     Result temp = cgen_->allocator()->Allocate();
     ASSERT(temp.is_valid());
     Use(temp.reg(), index);
     FrameElement new_element =
         FrameElement::RegisterElement(temp.reg(), FrameElement::SYNCED);
     // Preserve the copy flag on the element.
     if (element.is_copied()) new_element.set_copied();
+    new_element.set_static_type(element.static_type());
     elements_[index] = new_element;
     __ mov(temp.reg(), Operand(ebp, fp_relative(index)));
-    return Result(temp.reg(), cgen_);
+    return Result(temp.reg(), cgen_, element.static_type());
   } else if (element.is_register()) {
-    return Result(element.reg(), cgen_);
+    return Result(element.reg(), cgen_, element.static_type());
   } else {
     ASSERT(element.is_constant());
     return Result(element.handle(), cgen_);
   }
 }
 
 
 void VirtualFrame::EmitPop(Register reg) {
   ASSERT(stack_pointer_ == elements_.length() - 1);
   stack_pointer_--;
@@ skipping 30 matching lines @@
   ASSERT(stack_pointer_ == elements_.length() - 1);
   elements_.Add(FrameElement::MemoryElement());
   stack_pointer_++;
   __ push(immediate);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal