DFGSaneStringGetByValSlowPathGenerator.h [plain text]
#ifndef DFGSaneStringGetByValSlowPathGenerator_h
#define DFGSaneStringGetByValSlowPathGenerator_h
#if ENABLE(DFG_JIT)
#include "DFGCommon.h"
#include "DFGOperations.h"
#include "DFGSlowPathGenerator.h"
#include "DFGSpeculativeJIT.h"
#include <wtf/Vector.h>
namespace JSC { namespace DFG {
class SaneStringGetByValSlowPathGenerator : public JumpingSlowPathGenerator<MacroAssembler::Jump> {
public:
SaneStringGetByValSlowPathGenerator(
const MacroAssembler::Jump& from, SpeculativeJIT* jit, JSValueRegs resultRegs,
GPRReg baseReg, GPRReg propertyReg)
: JumpingSlowPathGenerator<MacroAssembler::Jump>(from, jit)
, m_resultRegs(resultRegs)
, m_baseReg(baseReg)
, m_propertyReg(propertyReg)
{
jit->silentSpillAllRegistersImpl(false, m_plans, extractResult(resultRegs));
}
protected:
void generateInternal(SpeculativeJIT* jit) override
{
linkFrom(jit);
MacroAssembler::Jump isNeg = jit->m_jit.branch32(
MacroAssembler::LessThan, m_propertyReg, MacroAssembler::TrustedImm32(0));
#if USE(JSVALUE64)
jit->m_jit.move(
MacroAssembler::TrustedImm64(JSValue::encode(jsUndefined())), m_resultRegs.gpr());
#else
jit->m_jit.move(
MacroAssembler::TrustedImm32(JSValue::UndefinedTag), m_resultRegs.tagGPR());
jit->m_jit.move(
MacroAssembler::TrustedImm32(0), m_resultRegs.payloadGPR());
#endif
jumpTo(jit);
isNeg.link(&jit->m_jit);
for (unsigned i = 0; i < m_plans.size(); ++i)
jit->silentSpill(m_plans[i]);
jit->callOperation(operationGetByValStringInt, extractResult(m_resultRegs), m_baseReg, m_propertyReg);
GPRReg canTrample = SpeculativeJIT::pickCanTrample(extractResult(m_resultRegs));
for (unsigned i = m_plans.size(); i--;)
jit->silentFill(m_plans[i], canTrample);
jit->m_jit.exceptionCheck();
jumpTo(jit);
}
private:
JSValueRegs m_resultRegs;
GPRReg m_baseReg;
GPRReg m_propertyReg;
Vector<SilentRegisterSavePlan, 2> m_plans;
};
} }
#endif // ENABLE(DFG_JIT)
#endif // DFGSaneStringGetByValSlowPathGenerator_h