JavaScriptCore-1218.tar.gz

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

diff --git a/heap/JITStubRoutineSet.cpp b/heap/JITStubRoutineSet.cpp
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+/*
+ * Copyright (C) 2012 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+#include "JITStubRoutineSet.h"
+
+#if ENABLE(JIT)
+
+#include "GCAwareJITStubRoutine.h"
+
+#include "SlotVisitor.h"
+
+namespace JSC {
+
+JITStubRoutineSet::JITStubRoutineSet() { }
+JITStubRoutineSet::~JITStubRoutineSet()
+{
+    for (size_t i = m_listOfRoutines.size(); i--;) {
+        GCAwareJITStubRoutine* routine = m_listOfRoutines[i];
+        
+        routine->m_mayBeExecuting = false;
+        
+        if (!routine->m_isJettisoned) {
+            // Inform the deref() routine that it should delete this guy as soon
+            // as the ref count reaches zero.
+            routine->m_isJettisoned = true;
+            continue;
+        }
+        
+        routine->deleteFromGC();
+    }
+}
+
+void JITStubRoutineSet::add(GCAwareJITStubRoutine* routine)
+{
+    ASSERT(!routine->m_isJettisoned);
+    
+    m_listOfRoutines.append(routine);
+    
+    uintptr_t start = routine->startAddress();
+    uintptr_t end = routine->endAddress();
+    uintptr_t step = JITStubRoutine::addressStep();
+    for (uintptr_t iter = start; iter < end; iter += step) {
+        ASSERT(m_addressToRoutineMap.find(iter) == m_addressToRoutineMap.end());
+        m_addressToRoutineMap.add(iter, routine);
+    }
+}
+
+void JITStubRoutineSet::clearMarks()
+{
+    for (size_t i = m_listOfRoutines.size(); i--;)
+        m_listOfRoutines[i]->m_mayBeExecuting = false;
+}
+
+void JITStubRoutineSet::markSlow(uintptr_t address)
+{
+    HashMap<uintptr_t, GCAwareJITStubRoutine*>::iterator iter =
+        m_addressToRoutineMap.find(address & ~(JITStubRoutine::addressStep() - 1));
+    
+    if (iter == m_addressToRoutineMap.end())
+        return;
+    
+    iter->value->m_mayBeExecuting = true;
+}
+
+void JITStubRoutineSet::deleteUnmarkedJettisonedStubRoutines()
+{
+    for (size_t i = 0; i < m_listOfRoutines.size(); i++) {
+        GCAwareJITStubRoutine* routine = m_listOfRoutines[i];
+        if (!routine->m_isJettisoned || routine->m_mayBeExecuting)
+            continue;
+        
+        uintptr_t start = routine->startAddress();
+        uintptr_t end = routine->endAddress();
+        uintptr_t step = JITStubRoutine::addressStep();
+        for (uintptr_t iter = start; iter < end; iter += step) {
+            ASSERT(m_addressToRoutineMap.find(iter) != m_addressToRoutineMap.end());
+            ASSERT(m_addressToRoutineMap.find(iter)->value == routine);
+            m_addressToRoutineMap.remove(iter);
+        }
+        
+        routine->deleteFromGC();
+        
+        m_listOfRoutines[i] = m_listOfRoutines.last();
+        m_listOfRoutines.removeLast();
+        i--;
+    }
+}
+
+void JITStubRoutineSet::traceMarkedStubRoutines(SlotVisitor& visitor)
+{
+    for (size_t i = m_listOfRoutines.size(); i--;) {
+        GCAwareJITStubRoutine* routine = m_listOfRoutines[i];
+        if (!routine->m_mayBeExecuting)
+            continue;
+        
+        routine->markRequiredObjects(visitor);
+    }
+}
+
+} // namespace JSC
+
+#endif // ENABLE(JIT)
+