webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 26 insertions, 17 deletions

diff --git a/Source/JavaScriptCore/dfg/DFGOSRExitBase.h b/Source/JavaScriptCore/dfg/DFGOSRExitBase.h
index ee1d69de7..310963d84 100644
--- a/Source/JavaScriptCore/dfg/DFGOSRExitBase.h
+++ b/Source/JavaScriptCore/dfg/DFGOSRExitBase.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Apple Inc. All rights reserved.
+ * Copyright (C) 2013, 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
@@ -23,10 +23,7 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
  */
 
-#ifndef DFGOSRExitBase_h
-#define DFGOSRExitBase_h
-
-#include <wtf/Platform.h>
+#pragma once
 
 #if ENABLE(DFG_JIT)
 
@@ -42,36 +39,48 @@ struct Node;
 // and the FTL.
 
 struct OSRExitBase {
-    OSRExitBase(ExitKind kind, CodeOrigin origin, CodeOrigin originForProfile)
+    OSRExitBase(ExitKind kind, CodeOrigin origin, CodeOrigin originForProfile, bool wasHoisted)
         : m_kind(kind)
-        , m_count(0)
+        , m_wasHoisted(wasHoisted)
         , m_codeOrigin(origin)
         , m_codeOriginForExitProfile(originForProfile)
     {
         ASSERT(m_codeOrigin.isSet());
         ASSERT(m_codeOriginForExitProfile.isSet());
     }
-    
+
+    uint32_t m_count { 0 };
     ExitKind m_kind;
-    uint32_t m_count;
+    bool m_wasHoisted;
     
     CodeOrigin m_codeOrigin;
     CodeOrigin m_codeOriginForExitProfile;
+    CallSiteIndex m_exceptionHandlerCallSiteIndex;
+
+    ALWAYS_INLINE bool isExceptionHandler() const
+    {
+        return m_kind == ExceptionCheck || m_kind == GenericUnwind;
+    }
 
-    bool considerAddingAsFrequentExitSite(CodeBlock* profiledCodeBlock)
+    // True if this exit is used as an exception handler for unwinding. This happens to only be set when
+    // isExceptionHandler is true, but all this actually means is that the OSR exit will assume that the
+    // machine state is as it would be coming out of genericUnwind.
+    ALWAYS_INLINE bool isGenericUnwindHandler() const
     {
-        if (!m_count)
-            return false;
-        return considerAddingAsFrequentExitSiteSlow(profiledCodeBlock);
+        return m_kind == GenericUnwind;
+    }
+
+protected:
+    void considerAddingAsFrequentExitSite(CodeBlock* profiledCodeBlock, ExitingJITType jitType)
+    {
+        if (m_count)
+            considerAddingAsFrequentExitSiteSlow(profiledCodeBlock, jitType);
     }
 
 private:
-    bool considerAddingAsFrequentExitSiteSlow(CodeBlock* profiledCodeBlock);
+    void considerAddingAsFrequentExitSiteSlow(CodeBlock* profiledCodeBlock, ExitingJITType);
 };
 
 } } // namespace JSC::DFG
 
 #endif // ENABLE(DFG_JIT)
-
-#endif // DFGOSRExitBase_h
-