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Unified Diff: src/factory.cc

Issue 17418003: Short-circuit embedded cons strings. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: improved test Created 7 years, 6 months ago
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Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index 8b842a733928f7425f73870b8c61523bc03ac84c..10e70d909fdbf98be99fd436768170d9e621d3bb 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -259,6 +259,32 @@ Handle<String> Factory::NewConsString(Handle<String> first,
}
+template<typename SinkChar, typename StringType>
+Handle<String> ConcatStringContent(Handle<StringType> result,
+ Handle<String> first,
+ Handle<String> second) {
+ DisallowHeapAllocation pointer_stays_valid;
+ SinkChar* sink = result->GetChars();
+ String::WriteToFlat(*first, sink, 0, first->length());
+ String::WriteToFlat(*second, sink + first->length(), 0, second->length());
+ return result;
+}
+
+
+Handle<String> Factory::NewFlatConcatString(Handle<String> first,
+ Handle<String> second) {
+ int total_length = first->length() + second->length();
+ if (first->IsOneByteRepresentationUnderneath() &&
+ second->IsOneByteRepresentationUnderneath()) {
+ return ConcatStringContent<uint8_t>(
+ NewRawOneByteString(total_length), first, second);
+ } else {
+ return ConcatStringContent<uc16>(
+ NewRawTwoByteString(total_length), first, second);
+ }
+}
+
+
Handle<String> Factory::NewSubString(Handle<String> str,
int begin,
int end) {
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