Bug 1283924 - Add NewLatin1StringZ (r=jandem)

MozReview-Commit-ID: FSJuXAunBni

--HG--
extra : rebase_source : 95d42b15c8b95afc4579deff67683f0091836136

js/src/vm/String.cpp

@@ -11,6 +11,7 @@
 #include "mozilla/PodOperations.h"
 #include "mozilla/RangedPtr.h"
 #include "mozilla/TypeTraits.h"
+#include "mozilla/unused.h"
 
 #include "gc/Marking.h"
 #include "js/UbiNode.h"
@@ -1269,6 +1270,17 @@ NewStringCopyNDontDeflate<CanGC>(ExclusiveContext* cx, const Latin1Char* s, size
 template JSFlatString*
 NewStringCopyNDontDeflate<NoGC>(ExclusiveContext* cx, const Latin1Char* s, size_t n);
 
+JSFlatString*
+NewLatin1StringZ(ExclusiveContext* cx, UniqueChars chars)
+{
+    JSFlatString* str = NewString<CanGC>(cx, (Latin1Char*)chars.get(), strlen(chars.get()));
+    if (!str)
+        return nullptr;
+
+    mozilla::Unused << chars.release();
+    return str;
+}
+
 template <AllowGC allowGC, typename CharT>
 JSFlatString*
 NewStringCopyN(ExclusiveContext* cx, const CharT* s, size_t n)

js/src/vm/String.h

@@ -1174,6 +1174,10 @@ NewStringDontDeflate(js::ExclusiveContext* cx, CharT* chars, size_t length);
 extern JSLinearString*
 NewDependentString(JSContext* cx, JSString* base, size_t start, size_t length);
 
+/* Take ownership of an array of Latin1Chars. */
+extern JSFlatString*
+NewLatin1StringZ(js::ExclusiveContext* cx, UniqueChars chars);
+
 /* Copy a counted string and GC-allocate a descriptor for it. */
 template <js::AllowGC allowGC, typename CharT>
 extern JSFlatString*