InstanceOfStatus.h [plain text]
#pragma once
#include "CodeOrigin.h"
#include "ConcurrentJSLock.h"
#include "ICStatusMap.h"
#include "InstanceOfVariant.h"
#include "StubInfoSummary.h"
namespace JSC {
class AccessCase;
class CodeBlock;
class StructureStubInfo;
class InstanceOfStatus {
public:
enum State {
NoInformation,
Simple,
TakesSlowPath
};
InstanceOfStatus()
: m_state(NoInformation)
{
}
InstanceOfStatus(State state)
: m_state(state)
{
ASSERT(state == NoInformation || state == TakesSlowPath);
}
explicit InstanceOfStatus(StubInfoSummary summary)
{
switch (summary) {
case StubInfoSummary::NoInformation:
m_state = NoInformation;
return;
case StubInfoSummary::Simple:
case StubInfoSummary::MakesCalls:
RELEASE_ASSERT_NOT_REACHED();
return;
case StubInfoSummary::TakesSlowPath:
case StubInfoSummary::TakesSlowPathAndMakesCalls:
m_state = TakesSlowPath;
return;
}
RELEASE_ASSERT_NOT_REACHED();
}
static InstanceOfStatus computeFor(CodeBlock*, ICStatusMap&, unsigned bytecodeIndex);
#if ENABLE(DFG_JIT)
static InstanceOfStatus computeForStubInfo(const ConcurrentJSLocker&, StructureStubInfo*);
#endif
State state() const { return m_state; }
bool isSet() const { return m_state != NoInformation; }
explicit operator bool() const { return isSet(); }
bool isSimple() const { return m_state == Simple; }
bool takesSlowPath() const { return m_state == TakesSlowPath; }
JSObject* commonPrototype() const;
size_t numVariants() const { return m_variants.size(); }
const Vector<InstanceOfVariant, 2>& variants() const { return m_variants; }
const InstanceOfVariant& at(size_t index) const { return m_variants[index]; }
const InstanceOfVariant& operator[](size_t index) const { return at(index); }
void filter(const StructureSet&);
void dump(PrintStream&) const;
private:
void appendVariant(const InstanceOfVariant&);
State m_state;
Vector<InstanceOfVariant, 2> m_variants;
};
}