JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / heap / WeakSet.cpp

diff --git a/heap/WeakSet.cpp b/heap/WeakSet.cpp
index d9c773cefd68047a0c67d1ac5d7f8a081e89d039..1eed8c37ac0a7927e5904d6b122179b327088c78 100644 (file)
--- a/heap/WeakSet.cpp
+++ b/heap/WeakSet.cpp
@@ -27,6 +27,8 @@
 #include "WeakSet.h"
 
 #include "Heap.h"
+#include "JSCInlines.h"
+#include "VM.h"
 
 namespace JSC {
 
@@ -40,54 +42,23 @@ WeakSet::~WeakSet()
     m_blocks.clear();
 }
 
-void WeakSet::finalizeAll()
-{
-    for (WeakBlock* block = m_blocks.head(); block; block = block->next())
-        block->finalizeAll();
-}
-
-void WeakSet::visitLiveWeakImpls(HeapRootVisitor& visitor)
-{
-    for (WeakBlock* block = m_blocks.head(); block; block = block->next())
-        block->visitLiveWeakImpls(visitor);
-}
-
-void WeakSet::visitDeadWeakImpls(HeapRootVisitor& visitor)
-{
-    for (WeakBlock* block = m_blocks.head(); block; block = block->next())
-        block->visitDeadWeakImpls(visitor);
-}
-
 void WeakSet::sweep()
 {
-    WeakBlock* next;
-    for (WeakBlock* block = m_blocks.head(); block; block = next) {
-        next = block->next();
-
-        // If a block is completely empty, a new sweep won't have any effect.
-        if (!block->sweepResult().isNull() && block->sweepResult().blockIsFree)
-            continue;
-
-        block->takeSweepResult(); // Force a new sweep by discarding the last sweep.
+    for (WeakBlock* block = m_blocks.head(); block;) {
+        WeakBlock* nextBlock = block->next();
         block->sweep();
+        if (block->isLogicallyEmptyButNotFree()) {
+            // If this WeakBlock is logically empty, but still has Weaks pointing into it,
+            // we can't destroy it just yet. Detach it from the WeakSet and hand ownership
+            // to the Heap so we don't pin down the entire 64kB MarkedBlock.
+            m_blocks.remove(block);
+            heap()->addLogicallyEmptyWeakBlock(block);
+            block->disconnectMarkedBlock();
+        }
+        block = nextBlock;
     }
-}
-
-void WeakSet::shrink()
-{
-    WeakBlock* next;
-    for (WeakBlock* block = m_blocks.head(); block; block = next) {
-        next = block->next();
 
-        if (!block->sweepResult().isNull() && block->sweepResult().blockIsFree)
-            removeAllocator(block);
-    }
-}
-
-void WeakSet::resetAllocator()
-{
-    m_allocator = 0;
-    m_nextAllocator = m_blocks.head();
+    resetAllocator();
 }
 
 WeakBlock::FreeCell* WeakSet::findAllocator()
@@ -104,7 +75,6 @@ WeakBlock::FreeCell* WeakSet::tryFindAllocator()
         WeakBlock* block = m_nextAllocator;
         m_nextAllocator = m_nextAllocator->next();
 
-        block->sweep();
         WeakBlock::SweepResult sweepResult = block->takeSweepResult();
         if (sweepResult.freeList)
             return sweepResult.freeList;
@@ -115,8 +85,8 @@ WeakBlock::FreeCell* WeakSet::tryFindAllocator()
 
 WeakBlock::FreeCell* WeakSet::addAllocator()
 {
-    WeakBlock* block = WeakBlock::create();
-    m_heap->didAllocate(WeakBlock::blockSize);
+    WeakBlock* block = WeakBlock::create(m_markedBlock);
+    heap()->didAllocate(WeakBlock::blockSize);
     m_blocks.append(block);
     WeakBlock::SweepResult sweepResult = block->takeSweepResult();
     ASSERT(!sweepResult.isNull() && sweepResult.freeList);