Imported WebKit commit 2ea9d364d0f6efa8fa64acf19f451504c59be0e4 (http://svn.webkit.org/repository/webkit/trunk@104285)

1 files changed, 85 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/dfg/DFGOSRExitCompiler.cpp b/Source/JavaScriptCore/dfg/DFGOSRExitCompiler.cpp
new file mode 100644
index 000000000..3da8189d1
--- /dev/null
+++ b/Source/JavaScriptCore/dfg/DFGOSRExitCompiler.cpp
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2011 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 "DFGOSRExitCompiler.h"
+
+#if ENABLE(DFG_JIT)
+
+#include "CallFrame.h"
+#include "LinkBuffer.h"
+#include "RepatchBuffer.h"
+
+namespace JSC { namespace DFG {
+
+extern "C" {
+
+void compileOSRExit(ExecState* exec)
+{
+    CodeBlock* codeBlock = exec->codeBlock();
+    
+    ASSERT(codeBlock);
+    ASSERT(codeBlock->getJITType() == JITCode::DFGJIT);
+    
+    JSGlobalData* globalData = &exec->globalData();
+    
+    uint32_t exitIndex = globalData->osrExitIndex;
+    OSRExit& exit = codeBlock->osrExit(exitIndex);
+    
+    SpeculationRecovery* recovery = 0;
+    if (exit.m_recoveryIndex)
+        recovery = &codeBlock->speculationRecovery(exit.m_recoveryIndex - 1);
+
+#if DFG_ENABLE(DEBUG_VERBOSE)
+    fprintf(stderr, "Generating OSR exit #%u (bc#%u, @%u, %s) for code block %p.\n", exitIndex, exit.m_codeOrigin.bytecodeIndex, exit.m_nodeIndex, exitKindToString(exit.m_kind), codeBlock);
+#endif
+
+    {
+        AssemblyHelpers jit(globalData, codeBlock);
+        OSRExitCompiler exitCompiler(jit);
+        
+        exitCompiler.compileExit(exit, recovery);
+        
+        LinkBuffer patchBuffer(*globalData, &jit);
+        exit.m_code = patchBuffer.finalizeCode();
+
+#if DFG_ENABLE(DEBUG_VERBOSE)
+        fprintf(stderr, "OSR exit code at [%p, %p).\n", patchBuffer.debugAddress(), static_cast<char*>(patchBuffer.debugAddress()) + patchBuffer.debugSize());
+#endif
+    }
+    
+    {
+        RepatchBuffer repatchBuffer(codeBlock);
+        repatchBuffer.relink(exit.m_check.codeLocationForRepatch(codeBlock), CodeLocationLabel(exit.m_code.code()));
+    }
+    
+    globalData->osrExitJumpDestination = exit.m_code.code().executableAddress();
+}
+
+} // extern "C"
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)