Imported QtWebKit TP3 (git b57bc6801f1876c3220d5a4bfea33d620d477443)

Change-Id: I3b1d8a2808782c9f34d50240000e20cb38d3680f
Reviewed-by: Konstantin Tokarev <annulen@yandex.ru>

1 files changed, 121 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/ftl/FTLPatchpointExceptionHandle.cpp b/Source/JavaScriptCore/ftl/FTLPatchpointExceptionHandle.cpp
new file mode 100644
index 000000000..6dcc5ee87
--- /dev/null
+++ b/Source/JavaScriptCore/ftl/FTLPatchpointExceptionHandle.cpp
@@ -0,0 +1,121 @@
+/*
+ * 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. 
+ */
+
+#include "config.h"
+#include "FTLPatchpointExceptionHandle.h"
+
+#if ENABLE(FTL_JIT)
+
+#include "B3StackmapGenerationParams.h"
+#include "FTLExceptionTarget.h"
+#include "FTLOSRExit.h"
+#include "FTLOSRExitHandle.h"
+#include "FTLState.h"
+
+namespace JSC { namespace FTL {
+
+using namespace DFG;
+
+RefPtr<PatchpointExceptionHandle> PatchpointExceptionHandle::create(
+    State& state, OSRExitDescriptor* descriptor, NodeOrigin origin, unsigned offset,
+    const HandlerInfo& handler)
+{
+    return adoptRef(new PatchpointExceptionHandle(state, descriptor, origin, offset, handler));
+}
+
+RefPtr<PatchpointExceptionHandle> PatchpointExceptionHandle::defaultHandle(State& state)
+{
+    if (!state.defaultExceptionHandle) {
+        state.defaultExceptionHandle = adoptRef(
+            new PatchpointExceptionHandle(state, nullptr, NodeOrigin(), 0, HandlerInfo()));
+    }
+    return state.defaultExceptionHandle;
+}
+
+PatchpointExceptionHandle::~PatchpointExceptionHandle()
+{
+}
+
+RefPtr<ExceptionTarget> PatchpointExceptionHandle::scheduleExitCreation(
+    const B3::StackmapGenerationParams& params)
+{
+    if (!m_descriptor) {
+        // NOTE: This object could be a singleton, however usually we toss the ExceptionHandler
+        // object shortly after creation.
+        bool isDefaultHandler = true;
+        return adoptRef(
+            new ExceptionTarget(isDefaultHandler, m_state.exceptionHandler, nullptr));
+    }
+    bool isDefaultHandler = false;
+    return adoptRef(new ExceptionTarget(isDefaultHandler, { }, createHandle(ExceptionCheck, params)));
+}
+
+void PatchpointExceptionHandle::scheduleExitCreationForUnwind(
+    const B3::StackmapGenerationParams& params, CallSiteIndex callSiteIndex)
+{
+    if (!m_descriptor)
+        return;
+    
+    RefPtr<OSRExitHandle> handle = createHandle(GenericUnwind, params);
+
+    handle->exit.m_exceptionHandlerCallSiteIndex = callSiteIndex;
+
+    HandlerInfo handler = m_handler;
+    params.addLatePath(
+        [handle, handler, callSiteIndex] (CCallHelpers& jit) {
+            CodeBlock* codeBlock = jit.codeBlock();
+            jit.addLinkTask(
+                [=] (LinkBuffer& linkBuffer) {
+                    HandlerInfo newHandler = handler;
+                    newHandler.start = callSiteIndex.bits();
+                    newHandler.end = callSiteIndex.bits() + 1;
+                    newHandler.nativeCode = linkBuffer.locationOf(handle->label);
+                    codeBlock->appendExceptionHandler(newHandler);
+                });
+        });
+}
+
+PatchpointExceptionHandle::PatchpointExceptionHandle(
+    State& state, OSRExitDescriptor* descriptor, NodeOrigin origin, unsigned offset,
+    const HandlerInfo& handler)
+    : m_state(state)
+    , m_descriptor(descriptor)
+    , m_origin(origin)
+    , m_offset(offset)
+    , m_handler(handler)
+{
+}
+
+RefPtr<OSRExitHandle> PatchpointExceptionHandle::createHandle(
+    ExitKind kind, const B3::StackmapGenerationParams& params)
+{
+    return m_descriptor->emitOSRExitLater(
+        m_state, kind, m_origin, params, m_offset);
+}
+
+} } // namespace JSC::FTL
+
+#endif // ENABLE(FTL_JIT)
+