Imported QtWebKit TP3 (git b57bc6801f1876c3220d5a4bfea33d620d477443)

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

1 files changed, 114 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/ftl/FTLOSREntry.cpp b/Source/JavaScriptCore/ftl/FTLOSREntry.cpp
new file mode 100644
index 000000000..601b46094
--- /dev/null
+++ b/Source/JavaScriptCore/ftl/FTLOSREntry.cpp
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2013, 2014 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 "FTLOSREntry.h"
+
+#include "CallFrame.h"
+#include "CodeBlock.h"
+#include "DFGJITCode.h"
+#include "FTLForOSREntryJITCode.h"
+#include "JSStackInlines.h"
+#include "OperandsInlines.h"
+#include "JSCInlines.h"
+
+#if ENABLE(FTL_JIT)
+
+namespace JSC { namespace FTL {
+
+SUPPRESS_ASAN
+void* prepareOSREntry(
+    ExecState* exec, CodeBlock* dfgCodeBlock, CodeBlock* entryCodeBlock,
+    unsigned bytecodeIndex, unsigned streamIndex)
+{
+    VM& vm = exec->vm();
+    CodeBlock* baseline = dfgCodeBlock->baselineVersion();
+    ExecutableBase* executable = dfgCodeBlock->ownerExecutable();
+    DFG::JITCode* dfgCode = dfgCodeBlock->jitCode()->dfg();
+    ForOSREntryJITCode* entryCode = entryCodeBlock->jitCode()->ftlForOSREntry();
+    
+    if (Options::verboseOSR()) {
+        dataLog(
+            "FTL OSR from ", *dfgCodeBlock, " to ", *entryCodeBlock, " at bc#",
+            bytecodeIndex, ".\n");
+    }
+    
+    if (bytecodeIndex)
+        jsCast<ScriptExecutable*>(executable)->setDidTryToEnterInLoop(true);
+
+    if (bytecodeIndex != entryCode->bytecodeIndex()) {
+        if (Options::verboseOSR())
+            dataLog("    OSR failed because we don't have an entrypoint for bc#", bytecodeIndex, "; ours is for bc#", entryCode->bytecodeIndex(), "\n");
+        return 0;
+    }
+    
+    Operands<JSValue> values;
+    dfgCode->reconstruct(
+        exec, dfgCodeBlock, CodeOrigin(bytecodeIndex), streamIndex, values);
+    
+    if (Options::verboseOSR())
+        dataLog("    Values at entry: ", values, "\n");
+    
+    for (int argument = values.numberOfArguments(); argument--;) {
+        JSValue valueOnStack = exec->r(virtualRegisterForArgument(argument).offset()).asanUnsafeJSValue();
+        JSValue reconstructedValue = values.argument(argument);
+        if (valueOnStack == reconstructedValue || !argument)
+            continue;
+        dataLog("Mismatch between reconstructed values and the the value on the stack for argument arg", argument, " for ", *entryCodeBlock, " at bc#", bytecodeIndex, ":\n");
+        dataLog("    Value on stack: ", valueOnStack, "\n");
+        dataLog("    Reconstructed value: ", reconstructedValue, "\n");
+        RELEASE_ASSERT_NOT_REACHED();
+    }
+    
+    RELEASE_ASSERT(
+        static_cast<int>(values.numberOfLocals()) == baseline->m_numCalleeLocals);
+    
+    EncodedJSValue* scratch = static_cast<EncodedJSValue*>(
+        entryCode->entryBuffer()->dataBuffer());
+    
+    for (int local = values.numberOfLocals(); local--;)
+        scratch[local] = JSValue::encode(values.local(local));
+    
+    int stackFrameSize = entryCode->common.requiredRegisterCountForExecutionAndExit();
+    if (!vm.interpreter->stack().ensureCapacityFor(&exec->registers()[virtualRegisterForLocal(stackFrameSize - 1).offset()])) {
+        if (Options::verboseOSR())
+            dataLog("    OSR failed because stack growth failed.\n");
+        return 0;
+    }
+    
+    exec->setCodeBlock(entryCodeBlock);
+    
+    void* result = entryCode->addressForCall(ArityCheckNotRequired).executableAddress();
+    if (Options::verboseOSR())
+        dataLog("    Entry will succeed, going to address", RawPointer(result), "\n");
+    
+    return result;
+}
+
+} } // namespace JSC::FTL
+
+#endif // ENABLE(FTL_JIT)
+
+