1 //===-- ARM64MCInstLower.cpp - Convert ARM64 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 ARM64 MachineInstrs to their corresponding
13 //===----------------------------------------------------------------------===//
15 #include "ARM64MCInstLower.h"
16 #include "MCTargetDesc/ARM64BaseInfo.h"
17 #include "MCTargetDesc/ARM64MCExpr.h"
18 #include "llvm/CodeGen/AsmPrinter.h"
19 #include "llvm/CodeGen/MachineBasicBlock.h"
20 #include "llvm/CodeGen/MachineInstr.h"
21 #include "llvm/IR/Mangler.h"
22 #include "llvm/MC/MCExpr.h"
23 #include "llvm/MC/MCInst.h"
24 #include "llvm/Support/CodeGen.h"
25 #include "llvm/Target/TargetMachine.h"
28 ARM64MCInstLower::ARM64MCInstLower(MCContext &ctx, Mangler &mang,
30 : Ctx(ctx), Printer(printer), TargetTriple(printer.getTargetTriple()) {}
33 ARM64MCInstLower::GetGlobalAddressSymbol(const MachineOperand &MO) const {
34 return Printer.getSymbol(MO.getGlobal());
38 ARM64MCInstLower::GetExternalSymbolSymbol(const MachineOperand &MO) const {
39 return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
42 MCOperand ARM64MCInstLower::lowerSymbolOperandDarwin(const MachineOperand &MO,
43 MCSymbol *Sym) const {
44 // FIXME: We would like an efficient form for this, so we don't have to do a
45 // lot of extra uniquing.
46 MCSymbolRefExpr::VariantKind RefKind = MCSymbolRefExpr::VK_None;
47 if ((MO.getTargetFlags() & ARM64II::MO_GOT) != 0) {
48 if ((MO.getTargetFlags() & ARM64II::MO_FRAGMENT) == ARM64II::MO_PAGE)
49 RefKind = MCSymbolRefExpr::VK_GOTPAGE;
50 else if ((MO.getTargetFlags() & ARM64II::MO_FRAGMENT) ==
52 RefKind = MCSymbolRefExpr::VK_GOTPAGEOFF;
54 assert(0 && "Unexpected target flags with MO_GOT on GV operand");
55 } else if ((MO.getTargetFlags() & ARM64II::MO_TLS) != 0) {
56 if ((MO.getTargetFlags() & ARM64II::MO_FRAGMENT) == ARM64II::MO_PAGE)
57 RefKind = MCSymbolRefExpr::VK_TLVPPAGE;
58 else if ((MO.getTargetFlags() & ARM64II::MO_FRAGMENT) ==
60 RefKind = MCSymbolRefExpr::VK_TLVPPAGEOFF;
62 llvm_unreachable("Unexpected target flags with MO_TLS on GV operand");
64 if ((MO.getTargetFlags() & ARM64II::MO_FRAGMENT) == ARM64II::MO_PAGE)
65 RefKind = MCSymbolRefExpr::VK_PAGE;
66 else if ((MO.getTargetFlags() & ARM64II::MO_FRAGMENT) ==
68 RefKind = MCSymbolRefExpr::VK_PAGEOFF;
70 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, RefKind, Ctx);
71 if (!MO.isJTI() && MO.getOffset())
72 Expr = MCBinaryExpr::CreateAdd(
73 Expr, MCConstantExpr::Create(MO.getOffset(), Ctx), Ctx);
74 return MCOperand::CreateExpr(Expr);
77 MCOperand ARM64MCInstLower::lowerSymbolOperandELF(const MachineOperand &MO,
78 MCSymbol *Sym) const {
79 uint32_t RefFlags = 0;
81 if (MO.getTargetFlags() & ARM64II::MO_GOT)
82 RefFlags |= ARM64MCExpr::VK_GOT;
83 else if (MO.getTargetFlags() & ARM64II::MO_TLS) {
84 TLSModel::Model Model;
86 const GlobalValue *GV = MO.getGlobal();
87 Model = Printer.TM.getTLSModel(GV);
89 assert(MO.isSymbol() &&
90 StringRef(MO.getSymbolName()) == "_TLS_MODULE_BASE_" &&
91 "unexpected external TLS symbol");
92 Model = TLSModel::GeneralDynamic;
95 case TLSModel::InitialExec:
96 RefFlags |= ARM64MCExpr::VK_GOTTPREL;
98 case TLSModel::LocalExec:
99 RefFlags |= ARM64MCExpr::VK_TPREL;
101 case TLSModel::LocalDynamic:
102 RefFlags |= ARM64MCExpr::VK_DTPREL;
104 case TLSModel::GeneralDynamic:
105 RefFlags |= ARM64MCExpr::VK_TLSDESC;
109 // No modifier means this is a generic reference, classified as absolute for
110 // the cases where it matters (:abs_g0: etc).
111 RefFlags |= ARM64MCExpr::VK_ABS;
114 if ((MO.getTargetFlags() & ARM64II::MO_FRAGMENT) == ARM64II::MO_PAGE)
115 RefFlags |= ARM64MCExpr::VK_PAGE;
116 else if ((MO.getTargetFlags() & ARM64II::MO_FRAGMENT) == ARM64II::MO_PAGEOFF)
117 RefFlags |= ARM64MCExpr::VK_PAGEOFF;
118 else if ((MO.getTargetFlags() & ARM64II::MO_FRAGMENT) == ARM64II::MO_G3)
119 RefFlags |= ARM64MCExpr::VK_G3;
120 else if ((MO.getTargetFlags() & ARM64II::MO_FRAGMENT) == ARM64II::MO_G2)
121 RefFlags |= ARM64MCExpr::VK_G2;
122 else if ((MO.getTargetFlags() & ARM64II::MO_FRAGMENT) == ARM64II::MO_G1)
123 RefFlags |= ARM64MCExpr::VK_G1;
124 else if ((MO.getTargetFlags() & ARM64II::MO_FRAGMENT) == ARM64II::MO_G0)
125 RefFlags |= ARM64MCExpr::VK_G0;
127 if (MO.getTargetFlags() & ARM64II::MO_NC)
128 RefFlags |= ARM64MCExpr::VK_NC;
131 MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_None, Ctx);
132 if (!MO.isJTI() && MO.getOffset())
133 Expr = MCBinaryExpr::CreateAdd(
134 Expr, MCConstantExpr::Create(MO.getOffset(), Ctx), Ctx);
136 ARM64MCExpr::VariantKind RefKind;
137 RefKind = static_cast<ARM64MCExpr::VariantKind>(RefFlags);
138 Expr = ARM64MCExpr::Create(Expr, RefKind, Ctx);
140 return MCOperand::CreateExpr(Expr);
143 MCOperand ARM64MCInstLower::LowerSymbolOperand(const MachineOperand &MO,
144 MCSymbol *Sym) const {
145 if (TargetTriple.isOSDarwin())
146 return lowerSymbolOperandDarwin(MO, Sym);
148 assert(TargetTriple.isOSBinFormatELF() && "Expect Darwin or ELF target");
149 return lowerSymbolOperandELF(MO, Sym);
152 bool ARM64MCInstLower::lowerOperand(const MachineOperand &MO,
153 MCOperand &MCOp) const {
154 switch (MO.getType()) {
156 assert(0 && "unknown operand type");
157 case MachineOperand::MO_Register:
158 // Ignore all implicit register operands.
161 MCOp = MCOperand::CreateReg(MO.getReg());
163 case MachineOperand::MO_RegisterMask:
164 // Regmasks are like implicit defs.
166 case MachineOperand::MO_Immediate:
167 MCOp = MCOperand::CreateImm(MO.getImm());
169 case MachineOperand::MO_MachineBasicBlock:
170 MCOp = MCOperand::CreateExpr(
171 MCSymbolRefExpr::Create(MO.getMBB()->getSymbol(), Ctx));
173 case MachineOperand::MO_GlobalAddress:
174 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
176 case MachineOperand::MO_ExternalSymbol:
177 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
179 case MachineOperand::MO_JumpTableIndex:
180 MCOp = LowerSymbolOperand(MO, Printer.GetJTISymbol(MO.getIndex()));
182 case MachineOperand::MO_ConstantPoolIndex:
183 MCOp = LowerSymbolOperand(MO, Printer.GetCPISymbol(MO.getIndex()));
185 case MachineOperand::MO_BlockAddress:
186 MCOp = LowerSymbolOperand(
187 MO, Printer.GetBlockAddressSymbol(MO.getBlockAddress()));
193 void ARM64MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
194 OutMI.setOpcode(MI->getOpcode());
196 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
198 if (lowerOperand(MI->getOperand(i), MCOp))
199 OutMI.addOperand(MCOp);