JavaScriptCore-7600.1.4.9.tar.gz

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

diff --git a/ftl/FTLJSCall.cpp b/ftl/FTLJSCall.cpp
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+++ b/ftl/FTLJSCall.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 "FTLJSCall.h"
+
+#if ENABLE(FTL_JIT)
+
+#include "DFGNode.h"
+#include "LinkBuffer.h"
+
+namespace JSC { namespace FTL {
+
+JSCall::JSCall()
+    : m_stackmapID(UINT_MAX)
+    , m_node(nullptr)
+    , m_callLinkInfo(nullptr)
+    , m_instructionOffset(UINT_MAX)
+{
+}
+
+JSCall::JSCall(unsigned stackmapID, DFG::Node* node)
+    : m_stackmapID(stackmapID)
+    , m_node(node)
+    , m_callLinkInfo(nullptr)
+    , m_instructionOffset(0)
+{
+}
+
+void JSCall::emit(CCallHelpers& jit)
+{
+    m_callLinkInfo = jit.codeBlock()->addCallLinkInfo();
+    
+    CCallHelpers::Jump slowPath = jit.branchPtrWithPatch(
+        CCallHelpers::NotEqual, GPRInfo::regT0, m_targetToCheck,
+        CCallHelpers::TrustedImmPtr(0));
+    
+    jit.loadPtr(
+        CCallHelpers::Address(GPRInfo::regT0, JSFunction::offsetOfScopeChain()),
+        GPRInfo::regT1);
+    jit.store64(
+        GPRInfo::regT1,
+        CCallHelpers::Address(
+            CCallHelpers::stackPointerRegister,
+            sizeof(Register) * (JSStack::ScopeChain - JSStack::CallerFrameAndPCSize)));
+    
+    m_fastCall = jit.nearCall();
+    CCallHelpers::Jump done = jit.jump();
+    
+    slowPath.link(&jit);
+    
+    jit.move(CCallHelpers::TrustedImmPtr(m_callLinkInfo), GPRInfo::regT2);
+    m_slowCall = jit.nearCall();
+    
+    done.link(&jit);
+}
+
+void JSCall::link(VM& vm, LinkBuffer& linkBuffer)
+{
+    ThunkGenerator generator = linkThunkGeneratorFor(
+        m_node->op() == DFG::Construct ? CodeForConstruct : CodeForCall,
+        MustPreserveRegisters);
+    
+    linkBuffer.link(
+        m_slowCall, FunctionPtr(vm.getCTIStub(generator).code().executableAddress()));
+    
+    m_callLinkInfo->isFTL = true;
+    m_callLinkInfo->callType = m_node->op() == DFG::Construct ? CallLinkInfo::Construct : CallLinkInfo::Call;
+    m_callLinkInfo->codeOrigin = m_node->origin.semantic;
+    m_callLinkInfo->callReturnLocation = linkBuffer.locationOfNearCall(m_slowCall);
+    m_callLinkInfo->hotPathBegin = linkBuffer.locationOf(m_targetToCheck);
+    m_callLinkInfo->hotPathOther = linkBuffer.locationOfNearCall(m_fastCall);
+    m_callLinkInfo->calleeGPR = GPRInfo::regT0;
+}
+
+} } // namespace JSC::FTL
+
+#endif // ENABLE(FTL_JIT)
+