JavaScriptCore-1097.3.tar.gz

[apple/javascriptcore.git] / dfg / DFGThunks.cpp

diff --git a/dfg/DFGThunks.cpp b/dfg/DFGThunks.cpp
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+/*
+ * 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 "DFGThunks.h"
+
+#if ENABLE(DFG_JIT)
+
+#include "DFGFPRInfo.h"
+#include "DFGGPRInfo.h"
+#include "DFGOSRExitCompiler.h"
+#include "MacroAssembler.h"
+
+namespace JSC { namespace DFG {
+
+MacroAssemblerCodeRef osrExitGenerationThunkGenerator(JSGlobalData* globalData)
+{
+    MacroAssembler jit;
+    
+    size_t scratchSize = sizeof(EncodedJSValue) * (GPRInfo::numberOfRegisters + FPRInfo::numberOfRegisters);
+    ScratchBuffer* scratchBuffer = globalData->scratchBufferForSize(scratchSize);
+    EncodedJSValue* buffer = static_cast<EncodedJSValue*>(scratchBuffer->dataBuffer());
+    
+    for (unsigned i = 0; i < GPRInfo::numberOfRegisters; ++i)
+        jit.storePtr(GPRInfo::toRegister(i), buffer + i);
+    for (unsigned i = 0; i < FPRInfo::numberOfRegisters; ++i) {
+        jit.move(MacroAssembler::TrustedImmPtr(buffer + GPRInfo::numberOfRegisters + i), GPRInfo::regT0);
+        jit.storeDouble(FPRInfo::toRegister(i), GPRInfo::regT0);
+    }
+    
+    // Tell GC mark phase how much of the scratch buffer is active during call.
+    jit.move(MacroAssembler::TrustedImmPtr(scratchBuffer->activeLengthPtr()), GPRInfo::regT0);
+    jit.storePtr(MacroAssembler::TrustedImmPtr(scratchSize), GPRInfo::regT0);
+
+    // Set up one argument.
+#if CPU(X86)
+    jit.poke(GPRInfo::callFrameRegister, 0);
+#else
+    jit.move(GPRInfo::callFrameRegister, GPRInfo::argumentGPR0);
+#endif
+
+    MacroAssembler::Call functionCall = jit.call();
+
+    jit.move(MacroAssembler::TrustedImmPtr(scratchBuffer->activeLengthPtr()), GPRInfo::regT0);
+    jit.storePtr(MacroAssembler::TrustedImmPtr(0), GPRInfo::regT0);
+
+    for (unsigned i = 0; i < FPRInfo::numberOfRegisters; ++i) {
+        jit.move(MacroAssembler::TrustedImmPtr(buffer + GPRInfo::numberOfRegisters + i), GPRInfo::regT0);
+        jit.loadDouble(GPRInfo::regT0, FPRInfo::toRegister(i));
+    }
+    for (unsigned i = 0; i < GPRInfo::numberOfRegisters; ++i)
+        jit.loadPtr(buffer + i, GPRInfo::toRegister(i));
+    
+    jit.jump(MacroAssembler::AbsoluteAddress(&globalData->osrExitJumpDestination));
+    
+    LinkBuffer patchBuffer(*globalData, &jit, GLOBAL_THUNK_ID);
+    
+    patchBuffer.link(functionCall, compileOSRExit);
+    
+    return patchBuffer.finalizeCode();
+}
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)