Imported QtWebKit TP3 (git b57bc6801f1876c3220d5a4bfea33d620d477443)

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

1 files changed, 148 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/ftl/FTLSlowPathCall.cpp b/Source/JavaScriptCore/ftl/FTLSlowPathCall.cpp
new file mode 100644
index 000000000..eeba48274
--- /dev/null
+++ b/Source/JavaScriptCore/ftl/FTLSlowPathCall.cpp
@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) 2013-2015 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 "FTLSlowPathCall.h"
+
+#if ENABLE(FTL_JIT)
+
+#include "CCallHelpers.h"
+#include "FTLState.h"
+#include "FTLThunks.h"
+#include "GPRInfo.h"
+#include "JSCInlines.h"
+
+namespace JSC { namespace FTL {
+
+// This code relies on us being 64-bit. FTL is currently always 64-bit.
+static const size_t wordSize = 8;
+
+SlowPathCallContext::SlowPathCallContext(
+    RegisterSet usedRegisters, CCallHelpers& jit, unsigned numArgs, GPRReg returnRegister)
+    : m_jit(jit)
+    , m_numArgs(numArgs)
+    , m_returnRegister(returnRegister)
+{
+    // We don't care that you're using callee-save, stack, or hardware registers.
+    usedRegisters.exclude(RegisterSet::stackRegisters());
+    usedRegisters.exclude(RegisterSet::reservedHardwareRegisters());
+    usedRegisters.exclude(RegisterSet::calleeSaveRegisters());
+        
+    // The return register doesn't need to be saved.
+    if (m_returnRegister != InvalidGPRReg)
+        usedRegisters.clear(m_returnRegister);
+        
+    size_t stackBytesNeededForReturnAddress = wordSize;
+        
+    m_offsetToSavingArea =
+        (std::max(m_numArgs, NUMBER_OF_ARGUMENT_REGISTERS) - NUMBER_OF_ARGUMENT_REGISTERS) * wordSize;
+        
+    for (unsigned i = std::min(NUMBER_OF_ARGUMENT_REGISTERS, numArgs); i--;)
+        m_argumentRegisters.set(GPRInfo::toArgumentRegister(i));
+    m_callingConventionRegisters.merge(m_argumentRegisters);
+    if (returnRegister != InvalidGPRReg)
+        m_callingConventionRegisters.set(GPRInfo::returnValueGPR);
+    m_callingConventionRegisters.filter(usedRegisters);
+        
+    unsigned numberOfCallingConventionRegisters =
+        m_callingConventionRegisters.numberOfSetRegisters();
+        
+    size_t offsetToThunkSavingArea =
+        m_offsetToSavingArea +
+        numberOfCallingConventionRegisters * wordSize;
+        
+    m_stackBytesNeeded =
+        offsetToThunkSavingArea +
+        stackBytesNeededForReturnAddress +
+        (usedRegisters.numberOfSetRegisters() - numberOfCallingConventionRegisters) * wordSize;
+        
+    m_stackBytesNeeded = (m_stackBytesNeeded + stackAlignmentBytes() - 1) & ~(stackAlignmentBytes() - 1);
+        
+    m_jit.subPtr(CCallHelpers::TrustedImm32(m_stackBytesNeeded), CCallHelpers::stackPointerRegister);
+
+    m_thunkSaveSet = usedRegisters;
+        
+    // This relies on all calling convention registers also being temp registers.
+    unsigned stackIndex = 0;
+    for (unsigned i = GPRInfo::numberOfRegisters; i--;) {
+        GPRReg reg = GPRInfo::toRegister(i);
+        if (!m_callingConventionRegisters.get(reg))
+            continue;
+        m_jit.storePtr(reg, CCallHelpers::Address(CCallHelpers::stackPointerRegister, m_offsetToSavingArea + (stackIndex++) * wordSize));
+        m_thunkSaveSet.clear(reg);
+    }
+        
+    m_offset = offsetToThunkSavingArea;
+}
+    
+SlowPathCallContext::~SlowPathCallContext()
+{
+    if (m_returnRegister != InvalidGPRReg)
+        m_jit.move(GPRInfo::returnValueGPR, m_returnRegister);
+    
+    unsigned stackIndex = 0;
+    for (unsigned i = GPRInfo::numberOfRegisters; i--;) {
+        GPRReg reg = GPRInfo::toRegister(i);
+        if (!m_callingConventionRegisters.get(reg))
+            continue;
+        m_jit.loadPtr(CCallHelpers::Address(CCallHelpers::stackPointerRegister, m_offsetToSavingArea + (stackIndex++) * wordSize), reg);
+    }
+    
+    m_jit.addPtr(CCallHelpers::TrustedImm32(m_stackBytesNeeded), CCallHelpers::stackPointerRegister);
+}
+
+SlowPathCallKey SlowPathCallContext::keyWithTarget(void* callTarget) const
+{
+    return SlowPathCallKey(m_thunkSaveSet, callTarget, m_argumentRegisters, m_offset);
+}
+
+SlowPathCall SlowPathCallContext::makeCall(void* callTarget)
+{
+    SlowPathCall result = SlowPathCall(m_jit.call(), keyWithTarget(callTarget));
+
+    m_jit.addLinkTask(
+        [result] (LinkBuffer& linkBuffer) {
+            VM& vm = linkBuffer.vm();
+
+            MacroAssemblerCodeRef thunk =
+                vm.ftlThunks->getSlowPathCallThunk(vm, result.key());
+
+            linkBuffer.link(result.call(), CodeLocationLabel(thunk.code()));
+        });
+    
+    return result;
+}
+
+CallSiteIndex callSiteIndexForCodeOrigin(State& state, CodeOrigin codeOrigin)
+{
+    if (codeOrigin)
+        return state.jitCode->common.addCodeOrigin(codeOrigin);
+    return CallSiteIndex();
+}
+
+} } // namespace JSC::FTL
+
+#endif // ENABLE(FTL_JIT)
+