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/*
* Copyright (C) 2012, 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 CallLinkStatus_h
#define CallLinkStatus_h
#include "CodeSpecializationKind.h"
#include "Intrinsic.h"
#include "JSCJSValue.h"
namespace JSC {
class CodeBlock;
class ExecutableBase;
class InternalFunction;
class JSFunction;
class Structure;
class CallLinkStatus {
public:
CallLinkStatus()
: m_executable(0)
, m_structure(0)
, m_couldTakeSlowPath(false)
, m_isProved(false)
{
}
static CallLinkStatus takesSlowPath()
{
CallLinkStatus result;
result.m_couldTakeSlowPath = true;
return result;
}
explicit CallLinkStatus(JSValue);
CallLinkStatus(ExecutableBase* executable, Structure* structure)
: m_executable(executable)
, m_structure(structure)
, m_couldTakeSlowPath(false)
, m_isProved(false)
{
ASSERT(!!executable == !!structure);
}
CallLinkStatus& setIsProved(bool isProved)
{
m_isProved = isProved;
return *this;
}
static CallLinkStatus computeFor(CodeBlock*, unsigned bytecodeIndex);
CallLinkStatus& setHasBadFunctionExitSite(bool didHaveExitSite)
{
ASSERT(!m_isProved);
if (didHaveExitSite) {
// Turn this into a closure call.
m_callTarget = JSValue();
}
return *this;
}
CallLinkStatus& setHasBadCacheExitSite(bool didHaveExitSite)
{
ASSERT(!m_isProved);
if (didHaveExitSite)
*this = takesSlowPath();
return *this;
}
CallLinkStatus& setHasBadExecutableExitSite(bool didHaveExitSite)
{
ASSERT(!m_isProved);
if (didHaveExitSite)
*this = takesSlowPath();
return *this;
}
bool isSet() const { return m_callTarget || m_executable || m_couldTakeSlowPath; }
bool operator!() const { return !isSet(); }
bool couldTakeSlowPath() const { return m_couldTakeSlowPath; }
bool isClosureCall() const { return m_executable && !m_callTarget; }
JSValue callTarget() const { return m_callTarget; }
JSFunction* function() const;
InternalFunction* internalFunction() const;
Intrinsic intrinsicFor(CodeSpecializationKind) const;
ExecutableBase* executable() const { return m_executable; }
Structure* structure() const { return m_structure; }
bool isProved() const { return m_isProved; }
bool canOptimize() const { return (m_callTarget || m_executable) && !m_couldTakeSlowPath; }
void dump(PrintStream&) const;
private:
static CallLinkStatus computeFromLLInt(CodeBlock*, unsigned bytecodeIndex);
JSValue m_callTarget;
ExecutableBase* m_executable;
Structure* m_structure;
bool m_couldTakeSlowPath;
bool m_isProved;
};
} // namespace JSC
#endif // CallLinkStatus_h
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