1 //===-- PPCMCInstLower.cpp - Convert PPC MachineInstr to an 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 // This file contains code to lower PPC MachineInstrs to their corresponding
13 //===----------------------------------------------------------------------===//
16 #include "llvm/CodeGen/AsmPrinter.h"
17 #include "llvm/CodeGen/MachineBasicBlock.h"
18 #include "llvm/MC/MCExpr.h"
19 #include "llvm/MC/MCInst.h"
20 #include "llvm/Target/Mangler.h"
23 static MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol,
24 AsmPrinter &Printer) {
25 MCContext &Ctx = Printer.OutContext;
27 switch (MO.getTargetFlags()) {
28 default: assert(0 && "Unknown target flag on symbol operand");
30 Expr = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_None, Ctx);
34 Expr = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_ARM_LO16, Ctx);
39 if (!MO.isJTI() && MO.getOffset())
40 Expr = MCBinaryExpr::CreateAdd(Expr,
41 MCConstantExpr::Create(MO.getOffset(), Ctx),
43 return MCOperand::CreateExpr(Expr);
47 void llvm::LowerPPCMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI,
49 OutMI.setOpcode(MI->getOpcode());
51 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
52 const MachineOperand &MO = MI->getOperand(i);
55 switch (MO.getType()) {
58 assert(0 && "unknown operand type");
59 case MachineOperand::MO_Register:
60 assert(!MO.getSubReg() && "Subregs should be eliminated!");
61 MCOp = MCOperand::CreateReg(MO.getReg());
63 case MachineOperand::MO_Immediate:
64 MCOp = MCOperand::CreateImm(MO.getImm());
66 case MachineOperand::MO_MachineBasicBlock:
67 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
68 MO.getMBB()->getSymbol(), AP.OutContext));
70 case MachineOperand::MO_GlobalAddress:
71 MCOp = GetSymbolRef(MO, AP.Mang->getSymbol(MO.getGlobal()), AP);
73 case MachineOperand::MO_ExternalSymbol:
74 MCOp = GetSymbolRef(MO,
75 AP.GetExternalSymbolSymbol(MO.getSymbolName()), AP);
77 case MachineOperand::MO_JumpTableIndex:
78 MCOp = GetSymbolRef(MO, AP.GetJTISymbol(MO.getIndex()), AP);
80 case MachineOperand::MO_ConstantPoolIndex:
81 MCOp = GetSymbolRef(MO, AP.GetCPISymbol(MO.getIndex()), AP);
83 case MachineOperand::MO_BlockAddress:
84 MCOp = GetSymbolRef(MO,AP.GetBlockAddressSymbol(MO.getBlockAddress()),AP);
88 OutMI.addOperand(MCOp);