JavaScriptCore-7600.1.4.9.tar.gz

[apple/javascriptcore.git] / dfg / DFGSaneStringGetByValSlowPathGenerator.h

diff --git a/dfg/DFGSaneStringGetByValSlowPathGenerator.h b/dfg/DFGSaneStringGetByValSlowPathGenerator.h
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+/*
+ * Copyright (C) 2013 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. 
+ */
+
+#ifndef DFGSaneStringGetByValSlowPathGenerator_h
+#define DFGSaneStringGetByValSlowPathGenerator_h
+
+#if ENABLE(DFG_JIT)
+
+#include "DFGCommon.h"
+#include "DFGOperations.h"
+#include "DFGSlowPathGenerator.h"
+#include "DFGSpeculativeJIT.h"
+#include <wtf/Vector.h>
+
+namespace JSC { namespace DFG {
+
+class SaneStringGetByValSlowPathGenerator : public JumpingSlowPathGenerator<MacroAssembler::Jump> {
+public:
+    SaneStringGetByValSlowPathGenerator(
+        const MacroAssembler::Jump& from, SpeculativeJIT* jit, JSValueRegs resultRegs,
+        GPRReg baseReg, GPRReg propertyReg)
+        : JumpingSlowPathGenerator<MacroAssembler::Jump>(from, jit)
+        , m_resultRegs(resultRegs)
+        , m_baseReg(baseReg)
+        , m_propertyReg(propertyReg)
+    {
+        jit->silentSpillAllRegistersImpl(false, m_plans, extractResult(resultRegs));
+    }
+    
+protected:
+    virtual void generateInternal(SpeculativeJIT* jit) override
+    {
+        linkFrom(jit);
+        
+        MacroAssembler::Jump isNeg = jit->m_jit.branch32(
+            MacroAssembler::LessThan, m_propertyReg, MacroAssembler::TrustedImm32(0));
+        
+#if USE(JSVALUE64)
+        jit->m_jit.move(
+            MacroAssembler::TrustedImm64(JSValue::encode(jsUndefined())), m_resultRegs.gpr());
+#else
+        jit->m_jit.move(
+            MacroAssembler::TrustedImm32(JSValue::UndefinedTag), m_resultRegs.tagGPR());
+        jit->m_jit.move(
+            MacroAssembler::TrustedImm32(0), m_resultRegs.payloadGPR());
+#endif
+        jumpTo(jit);
+        
+        isNeg.link(&jit->m_jit);
+
+        for (unsigned i = 0; i < m_plans.size(); ++i)
+            jit->silentSpill(m_plans[i]);
+        jit->callOperation(operationGetByValStringInt, extractResult(m_resultRegs), m_baseReg, m_propertyReg);
+        GPRReg canTrample = SpeculativeJIT::pickCanTrample(extractResult(m_resultRegs));
+        for (unsigned i = m_plans.size(); i--;)
+            jit->silentFill(m_plans[i], canTrample);
+        
+        jumpTo(jit);
+    }
+    
+private:
+    JSValueRegs m_resultRegs;
+    GPRReg m_baseReg;
+    GPRReg m_propertyReg;
+    Vector<SilentRegisterSavePlan, 2> m_plans;
+};
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+
+#endif // DFGSaneStringGetByValSlowPathGenerator_h
+