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/*
* Copyright (C) 2012-2016 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.
*/
#pragma once
#include "CallLinkInfo.h"
#include "CallVariant.h"
#include "CodeOrigin.h"
#include "ConcurrentJSLock.h"
#include "JSCJSValue.h"
namespace JSC {
class CodeBlock;
class InternalFunction;
class JSFunction;
class Structure;
class CallLinkInfo;
class CallLinkStatus {
WTF_MAKE_FAST_ALLOCATED;
public:
CallLinkStatus()
{
}
static CallLinkStatus takesSlowPath()
{
CallLinkStatus result;
result.m_couldTakeSlowPath = true;
return result;
}
explicit CallLinkStatus(JSValue);
CallLinkStatus(CallVariant variant)
: m_variants(1, variant)
{
}
static CallLinkStatus computeFor(
CodeBlock*, unsigned bytecodeIndex, const CallLinkInfoMap&);
struct ExitSiteData {
bool takesSlowPath { false };
bool badFunction { false };
};
static ExitSiteData computeExitSiteData(const ConcurrentJSLocker&, CodeBlock*, unsigned bytecodeIndex);
#if ENABLE(JIT)
// Computes the status assuming that we never took slow path and never previously
// exited.
static CallLinkStatus computeFor(const ConcurrentJSLocker&, CodeBlock*, CallLinkInfo&);
static CallLinkStatus computeFor(
const ConcurrentJSLocker&, CodeBlock*, CallLinkInfo&, ExitSiteData);
#endif
typedef HashMap<CodeOrigin, CallLinkStatus, CodeOriginApproximateHash> ContextMap;
// Computes all of the statuses of the DFG code block. Doesn't include statuses that had
// no information. Currently we use this when compiling FTL code, to enable polyvariant
// inlining.
static void computeDFGStatuses(CodeBlock* dfgCodeBlock, ContextMap&);
// Helper that first consults the ContextMap and then does computeFor().
static CallLinkStatus computeFor(
CodeBlock*, CodeOrigin, const CallLinkInfoMap&, const ContextMap&);
void setProvenConstantCallee(CallVariant);
bool isSet() const { return !m_variants.isEmpty() || m_couldTakeSlowPath; }
bool operator!() const { return !isSet(); }
bool couldTakeSlowPath() const { return m_couldTakeSlowPath; }
void setCouldTakeSlowPath(bool value) { m_couldTakeSlowPath = value; }
CallVariantList variants() const { return m_variants; }
unsigned size() const { return m_variants.size(); }
CallVariant at(unsigned i) const { return m_variants[i]; }
CallVariant operator[](unsigned i) const { return at(i); }
bool isProved() const { return m_isProved; }
bool isBasedOnStub() const { return m_isBasedOnStub; }
bool canOptimize() const { return !m_variants.isEmpty(); }
bool isClosureCall() const; // Returns true if any callee is a closure call.
unsigned maxNumArguments() const { return m_maxNumArguments; }
void dump(PrintStream&) const;
private:
void makeClosureCall();
static CallLinkStatus computeFromLLInt(const ConcurrentJSLocker&, CodeBlock*, unsigned bytecodeIndex);
#if ENABLE(JIT)
static CallLinkStatus computeFromCallLinkInfo(
const ConcurrentJSLocker&, CallLinkInfo&);
#endif
CallVariantList m_variants;
bool m_couldTakeSlowPath { false };
bool m_isProved { false };
bool m_isBasedOnStub { false };
unsigned m_maxNumArguments { 0 };
};
} // namespace JSC
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