Handle property name "-0" correctly for typed arrays.

R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/670623003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24768 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/heap/heap.h

@@ -324,7 +324,8 @@ namespace internal {
   V(value_string, "value")                                 \
   V(next_string, "next")                                   \
   V(byte_length_string, "byteLength")                      \
-  V(byte_offset_string, "byteOffset")
+  V(byte_offset_string, "byteOffset")                      \
+  V(minus_zero_string, "-0")
 
 #define PRIVATE_SYMBOL_LIST(V)      \
   V(frozen_symbol)                  \

src/lookup.cc

@@ -316,6 +316,10 @@ bool LookupIterator::IsSpecialNumericIndex() const {
       double d =
           StringToDouble(isolate()->unicode_cache(), *name_string, NO_FLAGS);
       if (!std::isnan(d)) {
+        if (String::Equals(isolate()->factory()->minus_zero_string(),
+                           name_string))
+          return true;
+
         Factory* factory = isolate()->factory();
         Handle<Object> num = factory->NewNumber(d);
         Handle<String> roundtrip_string = factory->NumberToString(num);

test/mjsunit/harmony/typedarrays.js

@@ -500,6 +500,13 @@ function TestTypedArraysWithIllegalIndices() {
   assertEquals(10, a["-1e2"]);
   assertEquals(undefined, a[-1e2]);
 
+  a["-0"] = 256;
+  var s2 = "     -0";
+  a[s2] = 255;
+  assertEquals(undefined, a["-0"]);
+  assertEquals(255, a[s2]);
+  assertEquals(0, a[-0]);
+
   /* Chromium bug: 424619
    * a[-Infinity] = 50;
    * assertEquals(undefined, a[-Infinity]);
@@ -542,6 +549,13 @@ function TestTypedArraysWithIllegalIndicesStrict() {
   assertEquals(10, a["-1e2"]);
   assertEquals(undefined, a[-1e2]);
 
+  a["-0"] = 256;
+  var s2 = "     -0";
+  a[s2] = 255;
+  assertEquals(undefined, a["-0"]);
+  assertEquals(255, a[s2]);
+  assertEquals(0, a[-0]);
+
   /* Chromium bug: 424619
    * a[-Infinity] = 50;
    * assertEquals(undefined, a[-Infinity]);