StructureStubInfo.h [plain text]
#ifndef StructureStubInfo_h
#define StructureStubInfo_h
#if ENABLE(JIT)
#include "CodeOrigin.h"
#include "Instruction.h"
#include "MacroAssembler.h"
#include "Opcode.h"
#include "Structure.h"
namespace JSC {
enum AccessType {
access_get_by_id_self,
access_get_by_id_proto,
access_get_by_id_chain,
access_get_by_id_self_list,
access_get_by_id_proto_list,
access_put_by_id_transition_normal,
access_put_by_id_transition_direct,
access_put_by_id_replace,
access_unset,
access_get_by_id_generic,
access_put_by_id_generic,
access_get_array_length,
access_get_string_length,
};
inline bool isGetByIdAccess(AccessType accessType)
{
switch (accessType) {
case access_get_by_id_self:
case access_get_by_id_proto:
case access_get_by_id_chain:
case access_get_by_id_self_list:
case access_get_by_id_proto_list:
case access_get_by_id_generic:
case access_get_array_length:
case access_get_string_length:
return true;
default:
return false;
}
}
inline bool isPutByIdAccess(AccessType accessType)
{
switch (accessType) {
case access_put_by_id_transition_normal:
case access_put_by_id_transition_direct:
case access_put_by_id_replace:
case access_put_by_id_generic:
return true;
default:
return false;
}
}
struct StructureStubInfo {
StructureStubInfo()
: accessType(access_unset)
, seen(false)
{
}
void initGetByIdSelf(JSGlobalData& globalData, JSCell* owner, Structure* baseObjectStructure)
{
accessType = access_get_by_id_self;
u.getByIdSelf.baseObjectStructure.set(globalData, owner, baseObjectStructure);
}
void initGetByIdProto(JSGlobalData& globalData, JSCell* owner, Structure* baseObjectStructure, Structure* prototypeStructure)
{
accessType = access_get_by_id_proto;
u.getByIdProto.baseObjectStructure.set(globalData, owner, baseObjectStructure);
u.getByIdProto.prototypeStructure.set(globalData, owner, prototypeStructure);
}
void initGetByIdChain(JSGlobalData& globalData, JSCell* owner, Structure* baseObjectStructure, StructureChain* chain)
{
accessType = access_get_by_id_chain;
u.getByIdChain.baseObjectStructure.set(globalData, owner, baseObjectStructure);
u.getByIdChain.chain.set(globalData, owner, chain);
}
void initGetByIdSelfList(PolymorphicAccessStructureList* structureList, int listSize)
{
accessType = access_get_by_id_self_list;
u.getByIdProtoList.structureList = structureList;
u.getByIdProtoList.listSize = listSize;
}
void initGetByIdProtoList(PolymorphicAccessStructureList* structureList, int listSize)
{
accessType = access_get_by_id_proto_list;
u.getByIdProtoList.structureList = structureList;
u.getByIdProtoList.listSize = listSize;
}
void initPutByIdTransition(JSGlobalData& globalData, JSCell* owner, Structure* previousStructure, Structure* structure, StructureChain* chain, bool isDirect)
{
if (isDirect)
accessType = access_put_by_id_transition_direct;
else
accessType = access_put_by_id_transition_normal;
u.putByIdTransition.previousStructure.set(globalData, owner, previousStructure);
u.putByIdTransition.structure.set(globalData, owner, structure);
u.putByIdTransition.chain.set(globalData, owner, chain);
}
void initPutByIdReplace(JSGlobalData& globalData, JSCell* owner, Structure* baseObjectStructure)
{
accessType = access_put_by_id_replace;
u.putByIdReplace.baseObjectStructure.set(globalData, owner, baseObjectStructure);
}
void reset()
{
accessType = access_unset;
stubRoutine = MacroAssemblerCodeRef();
}
void deref();
bool visitWeakReferences();
bool seenOnce()
{
return seen;
}
void setSeen()
{
seen = true;
}
unsigned bytecodeIndex;
int8_t accessType;
int8_t seen;
#if ENABLE(DFG_JIT)
CodeOrigin codeOrigin;
int8_t registersFlushed;
int8_t baseGPR;
#if USE(JSVALUE32_64)
int8_t valueTagGPR;
#endif
int8_t valueGPR;
int8_t scratchGPR;
int16_t deltaCallToDone;
int16_t deltaCallToStructCheck;
int16_t deltaCallToSlowCase;
int16_t deltaCheckImmToCall;
#if USE(JSVALUE64)
int16_t deltaCallToLoadOrStore;
#else
int16_t deltaCallToTagLoadOrStore;
int16_t deltaCallToPayloadLoadOrStore;
#endif
#endif // ENABLE(DFG_JIT)
union {
struct {
} unset;
struct {
WriteBarrierBase<Structure> baseObjectStructure;
} getByIdSelf;
struct {
WriteBarrierBase<Structure> baseObjectStructure;
WriteBarrierBase<Structure> prototypeStructure;
} getByIdProto;
struct {
WriteBarrierBase<Structure> baseObjectStructure;
WriteBarrierBase<StructureChain> chain;
} getByIdChain;
struct {
PolymorphicAccessStructureList* structureList;
int listSize;
} getByIdSelfList;
struct {
PolymorphicAccessStructureList* structureList;
int listSize;
} getByIdProtoList;
struct {
WriteBarrierBase<Structure> previousStructure;
WriteBarrierBase<Structure> structure;
WriteBarrierBase<StructureChain> chain;
} putByIdTransition;
struct {
WriteBarrierBase<Structure> baseObjectStructure;
} putByIdReplace;
} u;
MacroAssemblerCodeRef stubRoutine;
CodeLocationCall callReturnLocation;
CodeLocationLabel hotPathBegin;
};
}
#endif
#endif // StructureStubInfo_h