1 //===-- ARMMCInstLower.cpp - Convert ARM 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 ARM MachineInstrs to their corresponding
13 //===----------------------------------------------------------------------===//
16 #include "llvm/CodeGen/AsmPrinter.h"
17 #include "llvm/Constants.h"
18 #include "llvm/CodeGen/MachineBasicBlock.h"
19 #include "llvm/MC/MCAsmInfo.h"
20 #include "llvm/MC/MCContext.h"
21 #include "llvm/MC/MCExpr.h"
22 #include "llvm/MC/MCInst.h"
23 #include "llvm/Target/Mangler.h"
24 #include "llvm/Support/raw_ostream.h"
25 #include "llvm/ADT/SmallString.h"
29 static MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol,
30 AsmPrinter &Printer) {
31 MCContext &Ctx = Printer.OutContext;
33 switch (MO.getTargetFlags()) {
34 default: assert(0 && "Unknown target flag on symbol operand");
36 Expr = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_None, Ctx);
39 Expr = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_ARM_LO16, Ctx);
42 Expr = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_ARM_HI16, Ctx);
45 Expr = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_ARM_PLT, Ctx);
49 if (!MO.isJTI() && MO.getOffset())
50 Expr = MCBinaryExpr::CreateAdd(Expr,
51 MCConstantExpr::Create(MO.getOffset(), Ctx),
53 return MCOperand::CreateExpr(Expr);
57 void llvm::LowerToMCInst(const MachineInstr *MI, MCInst &OutMI, AsmPrinter &AP){
58 OutMI.setOpcode(MI->getOpcode());
60 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
61 const MachineOperand &MO = MI->getOperand(i);
64 switch (MO.getType()) {
67 assert(0 && "unknown operand type");
68 case MachineOperand::MO_Register:
69 // Ignore all non-CPSR implicit register operands.
70 if (MO.isImplicit() && MO.getReg() != ARM::CPSR) continue;
71 assert(!MO.getSubReg() && "Subregs should be eliminated!");
72 MCOp = MCOperand::CreateReg(MO.getReg());
74 case MachineOperand::MO_Immediate:
75 MCOp = MCOperand::CreateImm(MO.getImm());
77 case MachineOperand::MO_MachineBasicBlock:
78 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
79 MO.getMBB()->getSymbol(), AP.OutContext));
81 case MachineOperand::MO_GlobalAddress:
82 MCOp = GetSymbolRef(MO, AP.Mang->getSymbol(MO.getGlobal()), AP);
84 case MachineOperand::MO_ExternalSymbol:
85 MCOp = GetSymbolRef(MO,
86 AP.GetExternalSymbolSymbol(MO.getSymbolName()), AP);
88 case MachineOperand::MO_JumpTableIndex:
89 MCOp = GetSymbolRef(MO, AP.GetJTISymbol(MO.getIndex()), AP);
91 case MachineOperand::MO_ConstantPoolIndex:
92 MCOp = GetSymbolRef(MO, AP.GetCPISymbol(MO.getIndex()), AP);
94 case MachineOperand::MO_BlockAddress:
95 MCOp = GetSymbolRef(MO,AP.GetBlockAddressSymbol(MO.getBlockAddress()),AP);
97 case MachineOperand::MO_FPImmediate:
98 APFloat Val = MO.getFPImm()->getValueAPF();
100 Val.convert(APFloat::IEEEdouble, APFloat::rmTowardZero, &ignored);
101 MCOp = MCOperand::CreateFPImm(Val.convertToDouble());
105 OutMI.addOperand(MCOp);