Parser: Delay internalizing strings and values.

src/utils.cc

Index: src/utils.cc
diff --git a/src/utils.cc b/src/utils.cc
index b9964dbb51a886b3047cb13b2b76d36354b21f6b..00fcdb53625d4ccc8d31f212f8057e94263513eb 100644
--- a/src/utils.cc
+++ b/src/utils.cc
@@ -375,4 +375,24 @@ void init_memcopy_functions() {
 }
 
 
+bool DoubleToBoolean(double d) {
+  // NaN, +0, and -0 should return the false object
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+  union IeeeDoubleLittleEndianArchType u;
+#elif __BYTE_ORDER == __BIG_ENDIAN
+  union IeeeDoubleBigEndianArchType u;
+#endif
+  u.d = d;
+  if (u.bits.exp == 2047) {
+    // Detect NaN for IEEE double precision floating point.
+    if ((u.bits.man_low | u.bits.man_high) != 0) return false;
+  }
+  if (u.bits.exp == 0) {
+    // Detect +0, and -0 for IEEE double precision floating point.
+    if ((u.bits.man_low | u.bits.man_high) == 0) return false;
+  }
+  return true;
+}
+
+
 } }  // namespace v8::internal