JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / runtime / SmallStrings.h

diff --git a/runtime/SmallStrings.h b/runtime/SmallStrings.h
index e762e1f365c88c38d02cce2d775bd192e6c996c1..909bae1dea90e820563620ef309891ba21722dfd 100644 (file)
--- a/runtime/SmallStrings.h
+++ b/runtime/SmallStrings.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2008, 2009 Apple Inc. All Rights Reserved.
+ * Copyright (C) 2008, 2009, 2015 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -26,60 +26,118 @@
 #ifndef SmallStrings_h
 #define SmallStrings_h
 
-#include "UString.h"
-#include <wtf/FixedArray.h>
-#include <wtf/OwnPtr.h>
+#include "TypeofType.h"
+#include "WriteBarrier.h"
+#include <wtf/Noncopyable.h>
+
+#define JSC_COMMON_STRINGS_EACH_NAME(macro) \
+    macro(boolean) \
+    macro(false) \
+    macro(function) \
+    macro(number) \
+    macro(null) \
+    macro(object) \
+    macro(undefined) \
+    macro(string) \
+    macro(symbol) \
+    macro(true)
+
+namespace WTF {
+class StringImpl;
+}
 
 namespace JSC {
 
-    class HeapRootVisitor;
-    class JSGlobalData;
-    class JSString;
-    class MarkStack;
-    class SmallStringsStorage;
-    typedef MarkStack SlotVisitor;
-
-    static const unsigned maxSingleCharacterString = 0xFF;
-
-    class SmallStrings {
-        WTF_MAKE_NONCOPYABLE(SmallStrings);
-    public:
-        SmallStrings();
-        ~SmallStrings();
-
-        JSString* emptyString(JSGlobalData* globalData)
-        {
-            if (!m_emptyString)
-                createEmptyString(globalData);
-            return m_emptyString;
+class HeapRootVisitor;
+class VM;
+class JSString;
+class SmallStringsStorage;
+class SlotVisitor;
+
+static const unsigned maxSingleCharacterString = 0xFF;
+
+class SmallStrings {
+    WTF_MAKE_NONCOPYABLE(SmallStrings);
+public:
+    SmallStrings();
+    ~SmallStrings();
+
+    JSString* emptyString()
+    {
+        return m_emptyString;
+    }
+
+    JSString* singleCharacterString(unsigned char character)
+    {
+        return m_singleCharacterStrings[character];
+    }
+
+    JS_EXPORT_PRIVATE WTF::StringImpl* singleCharacterStringRep(unsigned char character);
+
+    JSString** singleCharacterStrings() { return &m_singleCharacterStrings[0]; }
+
+    void initializeCommonStrings(VM&);
+    void visitStrongReferences(SlotVisitor&);
+
+#define JSC_COMMON_STRINGS_ACCESSOR_DEFINITION(name) \
+    JSString* name##String() const                   \
+    {                                                \
+        return m_##name;                             \
+    }
+    JSC_COMMON_STRINGS_EACH_NAME(JSC_COMMON_STRINGS_ACCESSOR_DEFINITION)
+#undef JSC_COMMON_STRINGS_ACCESSOR_DEFINITION
+    
+    JSString* typeString(TypeofType type) const
+    {
+        switch (type) {
+        case TypeofType::Undefined:
+            return undefinedString();
+        case TypeofType::Boolean:
+            return booleanString();
+        case TypeofType::Number:
+            return numberString();
+        case TypeofType::String:
+            return stringString();
+        case TypeofType::Symbol:
+            return symbolString();
+        case TypeofType::Object:
+            return objectString();
+        case TypeofType::Function:
+            return functionString();
         }
-
-        JSString* singleCharacterString(JSGlobalData* globalData, unsigned char character)
-        {
-            if (!m_singleCharacterStrings[character])
-                createSingleCharacterString(globalData, character);
-            return m_singleCharacterStrings[character];
-        }
-
-        StringImpl* singleCharacterStringRep(unsigned char character);
-
-        void visitChildren(HeapRootVisitor&);
-        void clear();
-
-        unsigned count() const;
-
-        JSString** singleCharacterStrings() { return &m_singleCharacterStrings[0]; }
-
-    private:
-        static const unsigned singleCharacterStringCount = maxSingleCharacterString + 1;
-
-        void createEmptyString(JSGlobalData*);
-        void createSingleCharacterString(JSGlobalData*, unsigned char);
-
-        JSString* m_emptyString;
-        JSString* m_singleCharacterStrings[singleCharacterStringCount];
-        OwnPtr<SmallStringsStorage> m_storage;
-    };
+        
+        RELEASE_ASSERT_NOT_REACHED();
+        return nullptr;
+    }
+
+    JSString* nullObjectString() const { return m_nullObjectString; }
+    JSString* undefinedObjectString() const { return m_undefinedObjectString; }
+
+    bool needsToBeVisited(HeapOperation collectionType) const
+    {
+        if (collectionType == FullCollection)
+            return true;
+        return m_needsToBeVisited;
+    }
+
+private:
+    static const unsigned singleCharacterStringCount = maxSingleCharacterString + 1;
+
+    JS_EXPORT_PRIVATE void createEmptyString(VM*);
+    JS_EXPORT_PRIVATE void createSingleCharacterString(VM*, unsigned char);
+
+    void initialize(VM*, JSString*&, const char* value);
+
+    JSString* m_emptyString;
+#define JSC_COMMON_STRINGS_ATTRIBUTE_DECLARATION(name) JSString* m_##name;
+    JSC_COMMON_STRINGS_EACH_NAME(JSC_COMMON_STRINGS_ATTRIBUTE_DECLARATION)
+#undef JSC_COMMON_STRINGS_ATTRIBUTE_DECLARATION
+    JSString* m_nullObjectString;
+    JSString* m_undefinedObjectString;
+    JSString* m_singleCharacterStrings[singleCharacterStringCount];
+    std::unique_ptr<SmallStringsStorage> m_storage;
+    bool m_needsToBeVisited;
+};
 
 } // namespace JSC