webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 107 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/interpreter/FrameTracers.h b/Source/JavaScriptCore/interpreter/FrameTracers.h
new file mode 100644
index 000000000..c5b6b8338
--- /dev/null
+++ b/Source/JavaScriptCore/interpreter/FrameTracers.h
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+
+#pragma once
+
+#include "CatchScope.h"
+#include "VM.h"
+
+namespace JSC {
+
+struct VMEntryFrame;
+
+class SuspendExceptionScope {
+public:
+    SuspendExceptionScope(VM* vm)
+        : m_vm(vm)
+    {
+        auto scope = DECLARE_CATCH_SCOPE(*vm);
+        oldException = scope.exception();
+        scope.clearException();
+    }
+    ~SuspendExceptionScope()
+    {
+        m_vm->restorePreviousException(oldException);
+    }
+private:
+    Exception* oldException;
+    VM* m_vm;
+};
+
+class TopCallFrameSetter {
+public:
+    TopCallFrameSetter(VM& currentVM, CallFrame* callFrame)
+        : vm(currentVM)
+        , oldCallFrame(currentVM.topCallFrame)
+    {
+        currentVM.topCallFrame = callFrame;
+    }
+
+    ~TopCallFrameSetter()
+    {
+        vm.topCallFrame = oldCallFrame;
+    }
+private:
+    VM& vm;
+    CallFrame* oldCallFrame;
+};
+
+class NativeCallFrameTracer {
+public:
+    ALWAYS_INLINE NativeCallFrameTracer(VM* vm, CallFrame* callFrame)
+    {
+        ASSERT(vm);
+        ASSERT(callFrame);
+        ASSERT(reinterpret_cast<void*>(callFrame) < reinterpret_cast<void*>(vm->topVMEntryFrame));
+        vm->topCallFrame = callFrame;
+    }
+};
+
+class NativeCallFrameTracerWithRestore {
+public:
+    ALWAYS_INLINE NativeCallFrameTracerWithRestore(VM* vm, VMEntryFrame* vmEntryFrame, CallFrame* callFrame)
+        : m_vm(vm)
+    {
+        ASSERT(vm);
+        ASSERT(callFrame);
+        m_savedTopVMEntryFrame = vm->topVMEntryFrame;
+        m_savedTopCallFrame = vm->topCallFrame;
+        vm->topVMEntryFrame = vmEntryFrame;
+        vm->topCallFrame = callFrame;
+    }
+
+    ALWAYS_INLINE ~NativeCallFrameTracerWithRestore()
+    {
+        m_vm->topVMEntryFrame = m_savedTopVMEntryFrame;
+        m_vm->topCallFrame = m_savedTopCallFrame;
+    }
+
+private:
+    VM* m_vm;
+    VMEntryFrame* m_savedTopVMEntryFrame;
+    CallFrame* m_savedTopCallFrame;
+};
+
+}