Introduce StringImpl::createPreallocatedStatic

third_party/WebKit/Source/build/scripts/templates/MakeQualifiedNames.cpp.tmpl

Index: third_party/WebKit/Source/build/scripts/templates/MakeQualifiedNames.cpp.tmpl
diff --git a/third_party/WebKit/Source/build/scripts/templates/MakeQualifiedNames.cpp.tmpl b/third_party/WebKit/Source/build/scripts/templates/MakeQualifiedNames.cpp.tmpl
index 3e32ccde735dcad12ba3ae1893d807df39c066b1..e38706409a910f2cc687c90c60da0f4040cecdc8 100644
--- a/third_party/WebKit/Source/build/scripts/templates/MakeQualifiedNames.cpp.tmpl
+++ b/third_party/WebKit/Source/build/scripts/templates/MakeQualifiedNames.cpp.tmpl
@@ -54,14 +54,6 @@ PassOwnPtr<const QualifiedName*[]> get{{namespace}}Attrs()
 
 void init()
 {
-    struct NameEntry {
-        const char* name;
-        unsigned hash;
-        unsigned char length;
-        unsigned char isTag;
-        unsigned char isAttr;
-    };
-
     // Use placement new to initialize the globals.
     AtomicString {{namespace_prefix}}NS("{{namespace_uri}}", AtomicString::ConstructFromLiteral);
 
@@ -69,9 +61,21 @@ void init()
     new ((void*)&{{namespace_prefix}}NamespaceURI) AtomicString({{namespace_prefix}}NS);
     {% set tagnames = tags|map(attribute='name')|list() %}
     {% set attrnames = attrs|map(attribute='name')|list() %}
-    static const NameEntry kNames[] = {
+    const int kMaxNameLength = {{(tagnames + attrnames)|map('length')|max}} + 1;
+    struct NameEntry {
+        // StringImpl instances are created at |stringImplStorage| in-place.
+        // |name| must be placed soon after |stringImplStorage| to match the memory layout requirement of StringImpl.
+        char stringImplStorage[sizeof(StringImpl)];
+        char name[kMaxNameLength];
+        unsigned hash;
+        unsigned char length;
+        unsigned char isTag;
+        unsigned char isAttr;
+    };
+
+    static NameEntry kNames[] = {
     {% for name, tag_list in (tags + attrs)|groupby('name')|sort(attribute=0, case_sensitive=True) %}
-        { "{{name}}", {{name|hash}}, {{name|length}}, {{ (name in tagnames)|int }}, {{ (name in attrnames)|int }} },
+        { "", "{{name}}", {{name|hash}}, {{name|length}}, {{ (name in tagnames)|int }}, {{ (name in attrnames)|int }} },
     {% endfor %}
     };
 
@@ -80,7 +84,7 @@ void init()
     {% endif %}
     size_t attr_i = 0;
     for (size_t i = 0; i < WTF_ARRAY_LENGTH(kNames); i++) {
-        StringImpl* stringImpl = StringImpl::createStatic(kNames[i].name, kNames[i].length, kNames[i].hash);
+        StringImpl* stringImpl = StringImpl::createPreallocatedStatic(kNames[i].stringImplStorage, kNames[i].length, kNames[i].hash);
         {% if tags %}
         if (kNames[i].isTag) {
             void* address = reinterpret_cast<{{namespace}}QualifiedName*>(&{{suffix}}TagStorage) + tag_i;