+
+ return MFI->getObjectOffset(FI) + MFI->getStackSize() -
+ getOffsetOfLocalArea() + MFI->getOffsetAdjustment();
+}
+
+bool TargetFrameLowering::needsFrameIndexResolution(
+ const MachineFunction &MF) const {
+ return MF.getFrameInfo()->hasStackObjects();
+}
+
+void TargetFrameLowering::determineCalleeSaves(MachineFunction &MF,
+ BitVector &SavedRegs,
+ RegScavenger *RS) const {
+ // Get the callee saved register list...
+ const TargetRegisterInfo &TRI = *MF.getSubtarget().getRegisterInfo();
+ const MCPhysReg *CSRegs = TRI.getCalleeSavedRegs(&MF);
+
+ // Early exit if there are no callee saved registers.
+ if (!CSRegs || CSRegs[0] == 0)
+ return;
+
+ SavedRegs.resize(TRI.getNumRegs());
+
+ // In Naked functions we aren't going to save any registers.
+ if (MF.getFunction()->hasFnAttribute(Attribute::Naked))
+ return;
+
+ // Functions which call __builtin_unwind_init get all their registers saved.
+ bool CallsUnwindInit = MF.getMMI().callsUnwindInit();
+ const MachineRegisterInfo &MRI = MF.getRegInfo();
+ for (unsigned i = 0; CSRegs[i]; ++i) {
+ unsigned Reg = CSRegs[i];
+ if (CallsUnwindInit || MRI.isPhysRegModified(Reg))
+ SavedRegs.set(Reg);
+ }
+}
+
+unsigned TargetFrameLowering::getStackAlignmentSkew(
+ const MachineFunction &MF) const {
+ // When HHVM function is called, the stack is skewed as the return address
+ // is removed from the stack before we enter the function.
+ if (LLVM_UNLIKELY(MF.getFunction()->getCallingConv() == CallingConv::HHVM))
+ return MF.getTarget().getPointerSize();
+
+ return 0;