JavaScriptCore-7600.1.4.9.tar.gz

[apple/javascriptcore.git] / ftl / FTLLocation.cpp

diff --git a/ftl/FTLLocation.cpp b/ftl/FTLLocation.cpp
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+++ b/ftl/FTLLocation.cpp
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+/*
+ * 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 "FTLLocation.h"
+
+#if ENABLE(FTL_JIT)
+
+#include "FTLSaveRestore.h"
+#include "RegisterSet.h"
+#include <wtf/CommaPrinter.h>
+#include <wtf/DataLog.h>
+#include <wtf/ListDump.h>
+
+namespace JSC { namespace FTL {
+
+Location Location::forStackmaps(const StackMaps* stackmaps, const StackMaps::Location& location)
+{
+    switch (location.kind) {
+    case StackMaps::Location::Unprocessed:
+        RELEASE_ASSERT_NOT_REACHED();
+        break;
+        
+    case StackMaps::Location::Register:
+    case StackMaps::Location::Direct:
+        return forRegister(location.dwarfReg, location.offset);
+        
+    case StackMaps::Location::Indirect:
+        return forIndirect(location.dwarfReg, location.offset);
+        
+    case StackMaps::Location::Constant:
+        return forConstant(location.offset);
+        
+    case StackMaps::Location::ConstantIndex:
+        ASSERT(stackmaps);
+        return forConstant(stackmaps->constants[location.offset].integer);
+    }
+    
+    RELEASE_ASSERT_NOT_REACHED();
+
+    return Location();
+}
+
+void Location::dump(PrintStream& out) const
+{
+    out.print("(", kind());
+    if (hasDwarfReg())
+        out.print(", ", dwarfReg());
+    if (hasOffset())
+        out.print(", ", offset());
+    if (hasAddend())
+        out.print(", ", addend());
+    if (hasConstant())
+        out.print(", ", constant());
+    out.print(")");
+}
+
+bool Location::involvesGPR() const
+{
+    return isGPR() || kind() == Indirect;
+}
+
+bool Location::isGPR() const
+{
+    return kind() == Register && dwarfReg().reg().isGPR();
+}
+
+GPRReg Location::gpr() const
+{
+    return dwarfReg().reg().gpr();
+}
+
+bool Location::isFPR() const
+{
+    return kind() == Register && dwarfReg().reg().isFPR();
+}
+
+FPRReg Location::fpr() const
+{
+    return dwarfReg().reg().fpr();
+}
+
+void Location::restoreInto(MacroAssembler& jit, char* savedRegisters, GPRReg result, unsigned numFramesToPop) const
+{
+    if (involvesGPR() && RegisterSet::stackRegisters().get(gpr())) {
+        // Make the result GPR contain the appropriate stack register.
+        if (numFramesToPop) {
+            jit.move(MacroAssembler::framePointerRegister, result);
+            
+            for (unsigned i = numFramesToPop - 1; i--;)
+                jit.loadPtr(result, result);
+            
+            if (gpr() == MacroAssembler::framePointerRegister)
+                jit.loadPtr(result, result);
+            else
+                jit.addPtr(MacroAssembler::TrustedImmPtr(sizeof(void*) * 2), result);
+        } else
+            jit.move(gpr(), result);
+    }
+    
+    if (isGPR()) {
+        if (RegisterSet::stackRegisters().get(gpr())) {
+            // Already restored into result.
+        } else
+            jit.load64(savedRegisters + offsetOfGPR(gpr()), result);
+        
+        if (addend())
+            jit.add64(MacroAssembler::TrustedImm32(addend()), result);
+        return;
+    }
+    
+    if (isFPR()) {
+        jit.load64(savedRegisters + offsetOfFPR(fpr()), result);
+        ASSERT(!addend());
+        return;
+    }
+    
+    switch (kind()) {
+    case Register:
+        // LLVM used some register that we don't know about!
+        dataLog("Unrecognized location: ", *this, "\n");
+        RELEASE_ASSERT_NOT_REACHED();
+        return;
+        
+    case Indirect:
+        if (RegisterSet::stackRegisters().get(gpr())) {
+            // The stack register is already recovered into result.
+            jit.load64(MacroAssembler::Address(result, offset()), result);
+            return;
+        }
+        
+        jit.load64(savedRegisters + offsetOfGPR(gpr()), result);
+        jit.load64(MacroAssembler::Address(result, offset()), result);
+        return;
+        
+    case Constant:
+        jit.move(MacroAssembler::TrustedImm64(constant()), result);
+        return;
+        
+    case Unprocessed:
+        // Should never see this - it's an enumeration entry on LLVM's side that means that
+        // it hasn't processed this location.
+        RELEASE_ASSERT_NOT_REACHED();
+        return;
+    }
+    
+    RELEASE_ASSERT_NOT_REACHED();
+}
+
+GPRReg Location::directGPR() const
+{
+    RELEASE_ASSERT(!addend());
+    return gpr();
+}
+
+} } // namespace JSC::FTL
+
+namespace WTF {
+
+using namespace JSC::FTL;
+
+void printInternal(PrintStream& out, JSC::FTL::Location::Kind kind)
+{
+    switch (kind) {
+    case Location::Unprocessed:
+        out.print("Unprocessed");
+        return;
+    case Location::Register:
+        out.print("Register");
+        return;
+    case Location::Indirect:
+        out.print("Indirect");
+        return;
+    case Location::Constant:
+        out.print("Constant");
+        return;
+    }
+    RELEASE_ASSERT_NOT_REACHED();
+}
+
+} // namespace WTF
+
+#endif // ENABLE(FTL_JIT)
+