Implement HChange support for Smis and use it in Load/StoreNameField

test/mjsunit/smi-representation.js

 // Copyright 2013 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
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 //
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 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-this.__proto__ = null;
-this.x = 10;
-delete this.x;
+// Flags: --track-fields --track-double-fields --allow-natives-syntax
 
-function s(v) {
-  return v.x = 1;
+function smi_field() {
+  return {"smi":0};
 }
 
-function s_strict(v) {
-  "use strict";
-  return v.x = 1;
-}
-
-function c() {
-  var o = {__proto__:this};
+function check_smi_repr(o, d1, d2) {
+  var s = o.smi;
+  var d = d1 - d2;
+  s = s + d;
+  o.smi = s;
   return o;
 }
 
-var o1 = c();
-var o2 = c();
-var o1_strict = c();
-var o2_strict = c();
-var o3 = c();
-var o4 = c();
+var test = smi_field();
+check_smi_repr(smi_field(), 5, 3);
+check_smi_repr(smi_field(), 6, 2);
+%OptimizeFunctionOnNextCall(check_smi_repr);
+var val = check_smi_repr(smi_field(), 8, 1);
+assertTrue(%HaveSameMap(val, test));
 
-// Initialize the store IC.
-s(o1);
-s(o2);
-s_strict(o1_strict);
-s_strict(o2_strict);
+function tagged_smi_field() {
+  var o = {"tag":false};
+  o.tag = 10;
+  return o;
+}
 
-Object.defineProperty(this, "x", {writable:false, configurable:true});
+function check_smi_repr_from_tagged(o, o2) {
+  var t = o2.tag;
+  o.smi = t;
+  return o;
+}
 
-// Verify that directly setting x fails.
-o3.x = 1;
-assertEquals(undefined, o3.x);
-
-// Verify that setting x through the IC fails.
-assertThrows("s_strict(o4)", TypeError);
-s(o4);
-assertEquals(undefined, o4.x);
+check_smi_repr_from_tagged(smi_field(), tagged_smi_field());
+check_smi_repr_from_tagged(smi_field(), tagged_smi_field());
+%OptimizeFunctionOnNextCall(check_smi_repr_from_tagged);
+var val = check_smi_repr_from_tagged(smi_field(), tagged_smi_field());
+assertTrue(%HaveSameMap(val, test));
+var overflow = tagged_smi_field();
+overflow.tag = 0x80000000;
+var val = check_smi_repr_from_tagged(smi_field(), overflow);