1 //===-- X86MCInstLower.cpp - Convert X86 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 X86 MachineInstrs to their corresponding
13 //===----------------------------------------------------------------------===//
16 #include "X86ATTAsmPrinter.h"
17 #include "X86MCAsmInfo.h"
18 #include "llvm/MC/MCContext.h"
19 #include "llvm/MC/MCExpr.h"
20 #include "llvm/MC/MCInst.h"
21 #include "llvm/MC/MCStreamer.h"
22 #include "llvm/Support/FormattedStream.h"
23 #include "llvm/Support/Mangler.h"
24 #include "llvm/ADT/SmallString.h"
27 MCSymbol *X86ATTAsmPrinter::GetPICBaseSymbol() {
28 // FIXME: the actual label generated doesn't matter here! Just mangle in
29 // something unique (the function number) with Private prefix.
32 if (Subtarget->isTargetDarwin()) {
33 raw_svector_ostream(Name) << 'L' << getFunctionNumber() << "$pb";
35 assert(Subtarget->isTargetELF() && "Don't know how to print PIC label!");
36 raw_svector_ostream(Name) << ".Lllvm$" << getFunctionNumber()<<".$piclabel";
38 return OutContext.GetOrCreateSymbol(Name.str());
43 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
44 // Convert registers in the addr mode according to subreg64.
45 for (unsigned i = 0; i != 4; ++i) {
46 if (!MI->getOperand(i).isReg()) continue;
48 unsigned Reg = MI->getOperand(i).getReg();
49 if (Reg == 0) continue;
51 MI->getOperand(i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
55 /// LowerGlobalAddressOperand - Lower an MO_GlobalAddress operand to an
57 MCOperand X86ATTAsmPrinter::LowerGlobalAddressOperand(const MachineOperand &MO){
58 const GlobalValue *GV = MO.getGlobal();
60 const char *Suffix = "";
61 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
63 else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
64 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
65 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY ||
66 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
67 Suffix = "$non_lazy_ptr";
69 std::string Name = Mang->getMangledName(GV, Suffix, Suffix[0] != '\0');
70 if (Subtarget->isTargetCygMing())
71 DecorateCygMingName(Name, GV);
73 // Handle dllimport linkage.
74 if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
75 Name = "__imp_" + Name;
77 if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
78 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE)
79 GVStubs[Name] = Mang->getMangledName(GV);
80 else if (MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY ||
81 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
82 HiddenGVStubs[Name] = Mang->getMangledName(GV);
83 else if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
84 FnStubs[Name] = Mang->getMangledName(GV);
87 // Handle target operand flags.
88 // FIXME: This should be common between external symbols, constant pool etc.
89 MCSymbol *NegatedSymbol = 0;
91 switch (MO.getTargetFlags()) {
93 llvm_unreachable("Unknown target flag on GV operand");
94 case X86II::MO_NO_FLAG: // No flag.
96 case X86II::MO_DARWIN_NONLAZY:
97 case X86II::MO_DARWIN_HIDDEN_NONLAZY:
98 case X86II::MO_DLLIMPORT:
99 case X86II::MO_DARWIN_STUB:
100 // These affect the name of the symbol, not any suffix.
102 case X86II::MO_GOT_ABSOLUTE_ADDRESS:
103 assert(0 && "Reloc mode unimp!");
105 //PrintPICBaseSymbol();
108 case X86II::MO_PIC_BASE_OFFSET:
109 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
110 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
111 // Subtract the pic base.
112 NegatedSymbol = GetPICBaseSymbol();
115 // FIXME: These probably should be a modifier on the symbol or something??
116 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
117 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
118 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
119 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
120 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
121 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
122 case X86II::MO_GOT: Name += "@GOT"; break;
123 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
124 case X86II::MO_PLT: Name += "@PLT"; break;
127 // Create a symbol for the name.
128 MCSymbol *Sym = OutContext.GetOrCreateSymbol(Name);
129 // FIXME: We would like an efficient form for this, so we don't have to do a
130 // lot of extra uniquing.
131 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, OutContext);
133 Expr = MCBinaryExpr::CreateSub(Expr, MCSymbolRefExpr::Create(NegatedSymbol,
137 Expr = MCBinaryExpr::CreateAdd(Expr, MCConstantExpr::Create(MO.getOffset(),
140 return MCOperand::CreateExpr(Expr);
143 MCOperand X86ATTAsmPrinter::
144 LowerExternalSymbolOperand(const MachineOperand &MO) {
145 std::string Name = Mang->makeNameProper(MO.getSymbolName());
146 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
147 FnStubs[Name+"$stub"] = Name;
151 MCSymbol *Sym = OutContext.GetOrCreateSymbol(Name);
152 // FIXME: We would like an efficient form for this, so we don't have to do a
153 // lot of extra uniquing.
154 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, OutContext);
156 Expr = MCBinaryExpr::CreateAdd(Expr,
157 MCConstantExpr::Create(MO.getOffset(),
160 return MCOperand::CreateExpr(Expr);
163 MCOperand X86ATTAsmPrinter::LowerJumpTableOperand(const MachineOperand &MO) {
164 SmallString<256> Name;
165 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "JTI"
166 << getFunctionNumber() << '_' << MO.getIndex();
168 MCSymbol *NegatedSymbol = 0;
169 switch (MO.getTargetFlags()) {
171 llvm_unreachable("Unknown target flag on GV operand");
172 case X86II::MO_PIC_BASE_OFFSET:
173 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
174 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
175 // Subtract the pic base.
176 NegatedSymbol = GetPICBaseSymbol();
180 // Create a symbol for the name.
181 MCSymbol *Sym = OutContext.GetOrCreateSymbol(Name.str());
182 // FIXME: We would like an efficient form for this, so we don't have to do a
183 // lot of extra uniquing.
184 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, OutContext);
186 Expr = MCBinaryExpr::CreateSub(Expr, MCSymbolRefExpr::Create(NegatedSymbol,
189 return MCOperand::CreateExpr(Expr);
193 void X86ATTAsmPrinter::
194 printInstructionThroughMCStreamer(const MachineInstr *MI) {
198 switch (MI->getOpcode()) {
199 case TargetInstrInfo::DBG_LABEL:
200 case TargetInstrInfo::EH_LABEL:
201 case TargetInstrInfo::GC_LABEL:
204 case TargetInstrInfo::INLINEASM:
208 case TargetInstrInfo::IMPLICIT_DEF:
209 printImplicitDef(MI);
211 case X86::MOVPC32r: {
212 // This is a pseudo op for a two instruction sequence with a label, which
219 MCSymbol *PICBase = GetPICBaseSymbol();
220 TmpInst.setOpcode(X86::CALLpcrel32);
221 // FIXME: We would like an efficient form for this, so we don't have to do a
222 // lot of extra uniquing.
223 TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
225 printInstruction(&TmpInst);
228 OutStreamer.EmitLabel(PICBase);
231 TmpInst.setOpcode(X86::POP32r);
232 TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
233 printInstruction(&TmpInst);
238 TmpInst.setOpcode(MI->getOpcode());
240 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
241 const MachineOperand &MO = MI->getOperand(i);
244 switch (MO.getType()) {
247 errs() << "Cannot lower operand #" << i << " of :" << *MI;
248 llvm_unreachable("Unimp");
249 case MachineOperand::MO_JumpTableIndex:
250 MCOp = LowerJumpTableOperand(MO);
252 case MachineOperand::MO_Register:
253 MCOp = MCOperand::CreateReg(MO.getReg());
255 case MachineOperand::MO_Immediate:
256 MCOp = MCOperand::CreateImm(MO.getImm());
258 case MachineOperand::MO_MachineBasicBlock:
259 MCOp = MCOperand::CreateMBBLabel(getFunctionNumber(),
260 MO.getMBB()->getNumber());
262 case MachineOperand::MO_GlobalAddress:
263 MCOp = LowerGlobalAddressOperand(MO);
265 case MachineOperand::MO_ExternalSymbol:
266 MCOp = LowerExternalSymbolOperand(MO);
270 TmpInst.addOperand(MCOp);
273 switch (TmpInst.getOpcode()) {
275 // Handle the 'subreg rewriting' for the lea64_32mem operand.
276 lower_lea64_32mem(&TmpInst, 1);
280 printInstruction(&TmpInst);