1 //===-- BPFISelLowering.cpp - BPF DAG Lowering Implementation  ------------===//
8 //===----------------------------------------------------------------------===//
13 //===----------------------------------------------------------------------===//
34 #define DEBUG_TYPE "bpf-lower"
38   DAG.getContext()->diagnose(  in fail()
48   Val->print(OS);  in fail()
50   DAG.getContext()->diagnose(  in fail()
143   default:  in LowerOperation()
156   default:  in LowerFormalArguments()
176       default: {  in LowerFormalArguments()
186         // If this is an 8/16/32-bit value, it is really passed promoted to 64  in LowerFormalArguments()
207   if (IsVarArg || MF.getFunction()->hasStructRetAttr()) {  in LowerFormalArguments()
216 SDValue BPFTargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI,  in LowerCall()  argument
218   SelectionDAG &DAG = CLI.DAG;  in LowerCall()
219   auto &Outs = CLI.Outs;  in LowerCall()
220   auto &OutVals = CLI.OutVals;  in LowerCall()
221   auto &Ins = CLI.Ins;  in LowerCall()
222   SDValue Chain = CLI.Chain;  in LowerCall()
223   SDValue Callee = CLI.Callee;  in LowerCall()
224   bool &IsTailCall = CLI.IsTailCall;  in LowerCall()
225   CallingConv::ID CallConv = CLI.CallConv;  in LowerCall()
226   bool IsVarArg = CLI.IsVarArg;  in LowerCall()
233   default:  in LowerCall()
249     fail(CLI.DL, DAG, "too many args to ", Callee);  in LowerCall()
256     fail(CLI.DL, DAG, "pass by value not supported ", Callee);  in LowerCall()
261       Chain, DAG.getConstant(NumBytes, CLI.DL, PtrVT, true), CLI.DL);  in LowerCall()
274     default:  in LowerCall()
279       Arg = DAG.getNode(ISD::SIGN_EXTEND, CLI.DL, VA.getLocVT(), Arg);  in LowerCall()
282       Arg = DAG.getNode(ISD::ZERO_EXTEND, CLI.DL, VA.getLocVT(), Arg);  in LowerCall()
285       Arg = DAG.getNode(ISD::ANY_EXTEND, CLI.DL, VA.getLocVT(), Arg);  in LowerCall()
298   // Build a sequence of copy-to-reg nodes chained together with token chain and  in LowerCall()
302     Chain = DAG.getCopyToReg(Chain, CLI.DL, Reg.first, Reg.second, InFlag);  in LowerCall()
308   // Likewise ExternalSymbol -> TargetExternalSymbol.  in LowerCall()
310     Callee = DAG.getTargetGlobalAddress(G->getGlobal(), CLI.DL, PtrVT,  in LowerCall()
311                                         G->getOffset(), 0);  in LowerCall()
313     Callee = DAG.getTargetExternalSymbol(E->getSymbol(), PtrVT, 0);  in LowerCall()
329   Chain = DAG.getNode(BPFISD::CALL, CLI.DL, NodeTys, Ops);  in LowerCall()
334       Chain, DAG.getConstant(NumBytes, CLI.DL, PtrVT, true),  in LowerCall()
335       DAG.getConstant(0, CLI.DL, PtrVT, true), InFlag, CLI.DL);  in LowerCall()
340   return LowerCallResult(Chain, InFlag, CallConv, IsVarArg, Ins, CLI.DL, DAG,  in LowerCall()
352   // CCValAssign - represent the assignment of the return value to a location  in LowerReturn()
356   // CCState - Info about the registers and stack slot.  in LowerReturn()
359   if (MF.getFunction()->getReturnType()->isAggregateType()) {  in LowerReturn()
424   default:  in NegateCC()
438   ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();  in LowerBR_CC()
455   ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();  in LowerSELECT_CC()
489   const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();  in LowerGlobalAddress()
498   const TargetInstrInfo &TII = *BB->getParent()->getSubtarget().getInstrInfo();  in EmitInstrWithCustomInserter()
504   // control-flow pattern.  The incoming instruction knows the destination vreg  in EmitInstrWithCustomInserter()
507   const BasicBlock *LLVM_BB = BB->getBasicBlock();  in EmitInstrWithCustomInserter()
508   MachineFunction::iterator I = ++BB->getIterator();  in EmitInstrWithCustomInserter()
514   //  fallthrough --> Copy0MBB  in EmitInstrWithCustomInserter()
516   MachineFunction *F = BB->getParent();  in EmitInstrWithCustomInserter()
517   MachineBasicBlock *Copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);  in EmitInstrWithCustomInserter()
518   MachineBasicBlock *Copy1MBB = F->CreateMachineBasicBlock(LLVM_BB);  in EmitInstrWithCustomInserter()
520   F->insert(I, Copy0MBB);  in EmitInstrWithCustomInserter()
521   F->insert(I, Copy1MBB);  in EmitInstrWithCustomInserter()
522   // Update machine-CFG edges by transferring all successors of the current  in EmitInstrWithCustomInserter()
524   Copy1MBB->splice(Copy1MBB->begin(), BB,  in EmitInstrWithCustomInserter()
525                    std::next(MachineBasicBlock::iterator(MI)), BB->end());  in EmitInstrWithCustomInserter()
526   Copy1MBB->transferSuccessorsAndUpdatePHIs(BB);  in EmitInstrWithCustomInserter()
528   BB->addSuccessor(Copy0MBB);  in EmitInstrWithCustomInserter()
529   BB->addSuccessor(Copy1MBB);  in EmitInstrWithCustomInserter()
572   default:  in EmitInstrWithCustomInserter()
581   // Update machine-CFG edges  in EmitInstrWithCustomInserter()
582   BB->addSuccessor(Copy1MBB);  in EmitInstrWithCustomInserter()
588   BuildMI(*BB, BB->begin(), DL, TII.get(BPF::PHI), MI.getOperand(0).getReg())  in EmitInstrWithCustomInserter()