/// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
virtual void InstructionSelectBasicBlock(SelectionDAG &DAG);
+ virtual void EmitFunctionEntryCode(Function &Fn, MachineFunction &MF);
+
virtual bool CanBeFoldedBy(SDNode *N, SDNode *U, SDNode *Root) const;
// Include the pieces autogenerated from the target description.
std::vector<SDOperand> &OutOps,
SelectionDAG &DAG);
+ void EmitSpecialCodeForMain(MachineBasicBlock *BB, MachineFrameInfo *MFI);
+
inline void getAddressOperands(X86ISelAddressMode &AM, SDOperand &Base,
SDOperand &Scale, SDOperand &Index,
SDOperand &Disp) {
} while (&*(MBBI++) != BB);
}
+/// EmitSpecialCodeForMain - Emit any code that needs to be executed only in
+/// the main function.
+void X86DAGToDAGISel::EmitSpecialCodeForMain(MachineBasicBlock *BB,
+ MachineFrameInfo *MFI) {
+ const TargetInstrInfo *TII = TM.getInstrInfo();
+ if (Subtarget->isTargetCygMing())
+ BuildMI(BB, TII->get(X86::CALLpcrel32)).addExternalSymbol("__main");
+}
+
+void X86DAGToDAGISel::EmitFunctionEntryCode(Function &Fn, MachineFunction &MF) {
+ // If this is main, emit special code for main.
+ MachineBasicBlock *BB = MF.begin();
+ if (Fn.hasExternalLinkage() && Fn.getName() == "main")
+ EmitSpecialCodeForMain(BB, MF.getFrameInfo());
+}
+
/// MatchAddress - Add the specified node to the specified addressing mode,
/// returning true if it cannot be done. This just pattern matches for the
/// addressing mode