Flatten the string in StringToDouble function.

R=yangguo@chromium.org
BUG=chromium:425551
LOG=N

Review URL: https://codereview.chromium.org/654763003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24796 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/conversions.cc

@@ -483,19 +483,21 @@ char* DoubleToRadixCString(double value, int radix) {
 }
 
 
-double StringToDouble(UnicodeCache* unicode_cache,
-                      String* string,
-                      int flags,
-                      double empty_string_val) {
-  DisallowHeapAllocation no_gc;
-  String::FlatContent flat = string->GetFlatContent();
-  // ECMA-262 section 15.1.2.3, empty string is NaN
-  if (flat.IsOneByte()) {
-    return StringToDouble(
-        unicode_cache, flat.ToOneByteVector(), flags, empty_string_val);
-  } else {
-    return StringToDouble(
-        unicode_cache, flat.ToUC16Vector(), flags, empty_string_val);
+double StringToDouble(UnicodeCache* unicode_cache, Handle<String> string,
+                      int flags, double empty_string_val) {
+  Handle<String> flattened = String::Flatten(string);
+  {
+    DisallowHeapAllocation no_gc;
+    String::FlatContent flat = flattened->GetFlatContent();
+    DCHECK(flat.IsFlat());
+    // ECMA-262 section 15.1.2.3, empty string is NaN
+    if (flat.IsOneByte()) {
+      return StringToDouble(unicode_cache, flat.ToOneByteVector(), flags,
+                            empty_string_val);
+    } else {
+      return StringToDouble(unicode_cache, flat.ToUC16Vector(), flags,
+                            empty_string_val);
+    }
   }
 }
 

src/conversions.h

@@ -198,10 +198,8 @@ inline uint32_t NumberToUint32(Object* number) {
 }
 
 
-double StringToDouble(UnicodeCache* unicode_cache,
-                      String* string,
-                      int flags,
-                      double empty_string_val = 0.0);
+double StringToDouble(UnicodeCache* unicode_cache, Handle<String> string,
+                      int flags, double empty_string_val = 0.0);
 
 
 inline bool TryNumberToSize(Isolate* isolate,

src/lookup.cc

@@ -314,7 +314,7 @@ bool LookupIterator::IsSpecialNumericIndex() const {
     Handle<String> name_string = Handle<String>::cast(name());
     if (name_string->length() > 0) {
       double d =
-          StringToDouble(isolate()->unicode_cache(), *name_string, NO_FLAGS);
+          StringToDouble(isolate()->unicode_cache(), name_string, NO_FLAGS);
       if (!std::isnan(d)) {
         if (String::Equals(isolate()->factory()->minus_zero_string(),
                            name_string))

src/runtime/runtime-numbers.cc

@@ -193,7 +193,7 @@ RUNTIME_FUNCTION(Runtime_StringToNumber) {
   }
 
   return *isolate->factory()->NewNumber(
-      StringToDouble(isolate->unicode_cache(), *subject, flags));
+      StringToDouble(isolate->unicode_cache(), subject, flags));
 }
 
 
@@ -229,8 +229,7 @@ RUNTIME_FUNCTION(Runtime_StringParseFloat) {
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(String, subject, 0);
 
-  subject = String::Flatten(subject);
-  double value = StringToDouble(isolate->unicode_cache(), *subject,
+  double value = StringToDouble(isolate->unicode_cache(), subject,
                                 ALLOW_TRAILING_JUNK, base::OS::nan_value());
 
   return *isolate->factory()->NewNumber(value);

test/mjsunit/regress/regress-425551.js

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+var array = new Int8Array(10);
+array[/\u007d\u00fc\u0043/] = 1.499
+assertEquals(1.499, array[/\u007d\u00fc\u0043/]);