webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 83 insertions, 8 deletions

diff --git a/Source/JavaScriptCore/bytecode/HandlerInfo.h b/Source/JavaScriptCore/bytecode/HandlerInfo.h
index 8396c9607..752defe8a 100644
--- a/Source/JavaScriptCore/bytecode/HandlerInfo.h
+++ b/Source/JavaScriptCore/bytecode/HandlerInfo.h
@@ -23,25 +23,100 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
  */
 
-#ifndef HandlerInfo_h
-#define HandlerInfo_h
+#pragma once
 
 #include "CodeLocation.h"
-#include <wtf/Platform.h>
+#include <wtf/Vector.h>
 
 namespace JSC {
 
-struct HandlerInfo {
+enum class HandlerType {
+    Catch = 0,
+    Finally = 1,
+    SynthesizedCatch = 2,
+    SynthesizedFinally = 3
+};
+
+enum class RequiredHandler {
+    CatchHandler,
+    AnyHandler
+};
+
+struct HandlerInfoBase {
+    HandlerType type() const { return static_cast<HandlerType>(typeBits); }
+    void setType(HandlerType type) { typeBits = static_cast<uint32_t>(type); }
+
+    const char* typeName()
+    {
+        switch (type()) {
+        case HandlerType::Catch:
+            return "catch";
+        case HandlerType::Finally:
+            return "finally";
+        case HandlerType::SynthesizedCatch:
+            return "synthesized catch";
+        case HandlerType::SynthesizedFinally:
+            return "synthesized finally";
+        default:
+            ASSERT_NOT_REACHED();
+        }
+        return nullptr;
+    }
+
+    bool isCatchHandler() const { return type() == HandlerType::Catch; }
+
+    template<typename Handler>
+    static Handler* handlerForIndex(Vector<Handler>& exeptionHandlers, unsigned index, RequiredHandler requiredHandler)
+    {
+        for (Handler& handler : exeptionHandlers) {
+            if ((requiredHandler == RequiredHandler::CatchHandler) && !handler.isCatchHandler())
+                continue;
+
+            // Handlers are ordered innermost first, so the first handler we encounter
+            // that contains the source address is the correct handler to use.
+            // This index used is either the BytecodeOffset or a CallSiteIndex.
+            if (handler.start <= index && handler.end > index)
+                return &handler;
+        }
+
+        return nullptr;
+    }
+
     uint32_t start;
     uint32_t end;
     uint32_t target;
-    uint32_t scopeDepth;
+    uint32_t typeBits : 2; // HandlerType
+};
+
+struct UnlinkedHandlerInfo : public HandlerInfoBase {
+    UnlinkedHandlerInfo(uint32_t start, uint32_t end, uint32_t target, HandlerType handlerType)
+    {
+        this->start = start;
+        this->end = end;
+        this->target = target;
+        setType(handlerType);
+        ASSERT(type() == handlerType);
+    }
+};
+
+struct HandlerInfo : public HandlerInfoBase {
+    void initialize(const UnlinkedHandlerInfo& unlinkedInfo)
+    {
+        start = unlinkedInfo.start;
+        end = unlinkedInfo.end;
+        target = unlinkedInfo.target;
+        typeBits = unlinkedInfo.typeBits;
+    }
+
 #if ENABLE(JIT)
+    void initialize(const UnlinkedHandlerInfo& unlinkedInfo, CodeLocationLabel label)
+    {
+        initialize(unlinkedInfo);
+        nativeCode = label;
+    }
+
     CodeLocationLabel nativeCode;
 #endif
 };
 
 } // namespace JSC
-
-#endif // HandlerInfo_h
-