From a4e969f4965059196ca948db781e52f7cfebf19e Mon Sep 17 00:00:00 2001
From: Lorry Tar Creator <lorry-tar-importer@lorry>
Date: Tue, 24 May 2016 08:28:08 +0000
Subject: webkitgtk-2.12.3

---
 Source/JavaScriptCore/heap/CodeBlockSet.h | 58 ++++++++++++++++++++-----------
 1 file changed, 38 insertions(+), 20 deletions(-)

(limited to 'Source/JavaScriptCore/heap/CodeBlockSet.h')

diff --git a/Source/JavaScriptCore/heap/CodeBlockSet.h b/Source/JavaScriptCore/heap/CodeBlockSet.h
index 791d18699..56507c052 100644
--- a/Source/JavaScriptCore/heap/CodeBlockSet.h
+++ b/Source/JavaScriptCore/heap/CodeBlockSet.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Apple Inc. All rights reserved.
+ * Copyright (C) 2013, 2014 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -26,16 +26,20 @@
 #ifndef CodeBlockSet_h
 #define CodeBlockSet_h
 
+#include "GCSegmentedArray.h"
+#include "HeapOperation.h"
 #include <wtf/HashSet.h>
+#include <wtf/Lock.h>
 #include <wtf/Noncopyable.h>
 #include <wtf/PassRefPtr.h>
+#include <wtf/PrintStream.h>
 #include <wtf/RefPtr.h>
-#include <wtf/Vector.h>
 
 namespace JSC {
 
 class CodeBlock;
 class Heap;
+class JSCell;
 class SlotVisitor;
 
 // CodeBlockSet tracks all CodeBlocks. Every CodeBlock starts out with one
@@ -48,47 +52,61 @@ class CodeBlockSet {
 public:
     CodeBlockSet();
     ~CodeBlockSet();
+
+    void lastChanceToFinalize();
     
     // Add a CodeBlock. This is only called by CodeBlock constructors.
-    void add(PassRefPtr<CodeBlock>);
-    
-    // Clear all mark bits associated with DFG code blocks.
-    void clearMarks();
+    void add(CodeBlock*);
     
+    // Clear all mark bits for all CodeBlocks.
+    void clearMarksForFullCollection();
+
     // Mark a pointer that may be a CodeBlock that belongs to the set of DFG
     // blocks. This is defined in CodeBlock.h.
-    void mark(void* candidateCodeBlock);
+private:
+    void mark(const LockHolder&, CodeBlock* candidateCodeBlock);
+public:
+    void mark(const LockHolder&, void* candidateCodeBlock);
     
     // Delete all code blocks that are only referenced by this set (i.e. owned
     // by this set), and that have not been marked.
-    void deleteUnmarkedAndUnreferenced();
+    void deleteUnmarkedAndUnreferenced(HeapOperation);
     
-    // Trace all marked code blocks. The CodeBlock is free to make use of
-    // mayBeExecuting.
-    void traceMarked(SlotVisitor&);
-
     // Add all currently executing CodeBlocks to the remembered set to be 
     // re-scanned during the next collection.
-    void rememberCurrentlyExecutingCodeBlocks(Heap*);
+    void writeBarrierCurrentlyExecutingCodeBlocks(Heap*);
+
+    bool contains(const LockHolder&, void* candidateCodeBlock);
+    Lock& getLock() { return m_lock; }
 
     // Visits each CodeBlock in the heap until the visitor function returns true
     // to indicate that it is done iterating, or until every CodeBlock has been
     // visited.
     template<typename Functor> void iterate(Functor& functor)
     {
-        for (auto &codeBlock : m_set) {
+        LockHolder locker(m_lock);
+        for (auto& codeBlock : m_oldCodeBlocks) {
             bool done = functor(codeBlock);
             if (done)
-                break;
+                return;
+        }
+
+        for (auto& codeBlock : m_newCodeBlocks) {
+            bool done = functor(codeBlock);
+            if (done)
+                return;
         }
     }
+    
+    void dump(PrintStream&) const;
 
 private:
-    // This is not a set of RefPtr<CodeBlock> because we need to be able to find
-    // arbitrary bogus pointers. I could have written a thingy that had peek types
-    // and all, but that seemed like overkill.
-    HashSet<CodeBlock* > m_set;
-    Vector<CodeBlock*> m_currentlyExecuting;
+    void promoteYoungCodeBlocks(const LockHolder&);
+
+    HashSet<CodeBlock*> m_oldCodeBlocks;
+    HashSet<CodeBlock*> m_newCodeBlocks;
+    HashSet<CodeBlock*> m_currentlyExecuting;
+    Lock m_lock;
 };
 
 } // namespace JSC
-- 
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