1 //===-- SystemZMCInstLower.cpp - Lower MachineInstr to MCInst -------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "SystemZMCInstLower.h"
11 #include "SystemZAsmPrinter.h"
12 #include "llvm/IR/Mangler.h"
13 #include "llvm/MC/MCExpr.h"
14 #include "llvm/MC/MCStreamer.h"
18 // Return the VK_* enumeration for MachineOperand target flags Flags.
19 static MCSymbolRefExpr::VariantKind getVariantKind(unsigned Flags) {
20 switch (Flags & SystemZII::MO_SYMBOL_MODIFIER) {
22 return MCSymbolRefExpr::VK_None;
23 case SystemZII::MO_GOT:
24 return MCSymbolRefExpr::VK_GOT;
26 llvm_unreachable("Unrecognised MO_ACCESS_MODEL");
29 SystemZMCInstLower::SystemZMCInstLower(MCContext &ctx,
30 SystemZAsmPrinter &asmprinter)
31 : Ctx(ctx), AsmPrinter(asmprinter) {}
34 SystemZMCInstLower::getExpr(const MachineOperand &MO,
35 MCSymbolRefExpr::VariantKind Kind) const {
36 const MCSymbol *Symbol;
37 bool HasOffset = true;
38 switch (MO.getType()) {
39 case MachineOperand::MO_MachineBasicBlock:
40 Symbol = MO.getMBB()->getSymbol();
44 case MachineOperand::MO_GlobalAddress:
45 Symbol = AsmPrinter.getSymbol(MO.getGlobal());
48 case MachineOperand::MO_ExternalSymbol:
49 Symbol = AsmPrinter.GetExternalSymbolSymbol(MO.getSymbolName());
52 case MachineOperand::MO_JumpTableIndex:
53 Symbol = AsmPrinter.GetJTISymbol(MO.getIndex());
57 case MachineOperand::MO_ConstantPoolIndex:
58 Symbol = AsmPrinter.GetCPISymbol(MO.getIndex());
61 case MachineOperand::MO_BlockAddress:
62 Symbol = AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress());
66 llvm_unreachable("unknown operand type");
68 const MCExpr *Expr = MCSymbolRefExpr::Create(Symbol, Kind, Ctx);
70 if (int64_t Offset = MO.getOffset()) {
71 const MCExpr *OffsetExpr = MCConstantExpr::Create(Offset, Ctx);
72 Expr = MCBinaryExpr::CreateAdd(Expr, OffsetExpr, Ctx);
77 MCOperand SystemZMCInstLower::lowerOperand(const MachineOperand &MO) const {
78 switch (MO.getType()) {
79 case MachineOperand::MO_Register:
80 return MCOperand::CreateReg(MO.getReg());
82 case MachineOperand::MO_Immediate:
83 return MCOperand::CreateImm(MO.getImm());
86 MCSymbolRefExpr::VariantKind Kind = getVariantKind(MO.getTargetFlags());
87 return MCOperand::CreateExpr(getExpr(MO, Kind));
92 void SystemZMCInstLower::lower(const MachineInstr *MI, MCInst &OutMI) const {
93 OutMI.setOpcode(MI->getOpcode());
94 for (unsigned I = 0, E = MI->getNumOperands(); I != E; ++I) {
95 const MachineOperand &MO = MI->getOperand(I);
96 // Ignore all implicit register operands.
97 if (!MO.isReg() || !MO.isImplicit())
98 OutMI.addOperand(lowerOperand(MO));