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 //===----------------------------------------------------------------------===//
15 #include "X86MCInstLower.h"
16 #include "X86AsmPrinter.h"
17 #include "X86MCAsmInfo.h"
18 #include "X86COFFMachineModuleInfo.h"
19 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
20 #include "llvm/MC/MCContext.h"
21 #include "llvm/MC/MCExpr.h"
22 #include "llvm/MC/MCInst.h"
23 #include "llvm/MC/MCStreamer.h"
24 #include "llvm/Support/FormattedStream.h"
25 #include "llvm/Support/Mangler.h"
26 #include "llvm/ADT/SmallString.h"
30 const X86Subtarget &X86MCInstLower::getSubtarget() const {
31 return AsmPrinter.getSubtarget();
34 MachineModuleInfoMachO &X86MCInstLower::getMachOMMI() const {
35 assert(getSubtarget().isTargetDarwin() &&"Can only get MachO info on darwin");
36 return AsmPrinter.MMI->getObjFileInfo<MachineModuleInfoMachO>();
40 MCSymbol *X86MCInstLower::GetPICBaseSymbol() const {
41 return Ctx.GetOrCreateSymbol(Twine(AsmPrinter.MAI->getPrivateGlobalPrefix())+
42 Twine(AsmPrinter.getFunctionNumber())+"$pb");
46 /// LowerGlobalAddressOperand - Lower an MO_GlobalAddress operand to an
48 MCSymbol *X86MCInstLower::
49 GetGlobalAddressSymbol(const MachineOperand &MO) const {
50 const GlobalValue *GV = MO.getGlobal();
52 bool isImplicitlyPrivate = false;
53 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB ||
54 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
55 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
56 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
57 isImplicitlyPrivate = true;
59 SmallString<128> Name;
60 Mang->getNameWithPrefix(Name, GV, isImplicitlyPrivate);
62 if (getSubtarget().isTargetCygMing()) {
63 X86COFFMachineModuleInfo &COFFMMI =
64 AsmPrinter.MMI->getObjFileInfo<X86COFFMachineModuleInfo>();
65 COFFMMI.DecorateCygMingName(Name, GV, *AsmPrinter.TM.getTargetData());
68 switch (MO.getTargetFlags()) {
69 default: llvm_unreachable("Unknown target flag on GV operand");
70 case X86II::MO_NO_FLAG: // No flag.
71 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
73 case X86II::MO_DLLIMPORT: {
74 // Handle dllimport linkage.
75 const char *Prefix = "__imp_";
76 Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
79 case X86II::MO_DARWIN_NONLAZY:
80 case X86II::MO_DARWIN_NONLAZY_PIC_BASE: {
81 Name += "$non_lazy_ptr";
82 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
84 const MCSymbol *&StubSym = getMachOMMI().getGVStubEntry(Sym);
87 Mang->getNameWithPrefix(Name, GV, false);
88 StubSym = Ctx.GetOrCreateSymbol(Name.str());
92 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: {
93 Name += "$non_lazy_ptr";
94 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
95 const MCSymbol *&StubSym = getMachOMMI().getHiddenGVStubEntry(Sym);
98 Mang->getNameWithPrefix(Name, GV, false);
99 StubSym = Ctx.GetOrCreateSymbol(Name.str());
103 case X86II::MO_DARWIN_STUB: {
105 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
106 const MCSymbol *&StubSym = getMachOMMI().getFnStubEntry(Sym);
109 Mang->getNameWithPrefix(Name, GV, false);
110 StubSym = Ctx.GetOrCreateSymbol(Name.str());
114 // FIXME: These probably should be a modifier on the symbol or something??
115 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
116 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
117 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
118 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
119 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
120 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
121 case X86II::MO_GOT: Name += "@GOT"; break;
122 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
123 case X86II::MO_PLT: Name += "@PLT"; break;
126 return Ctx.GetOrCreateSymbol(Name.str());
129 MCSymbol *X86MCInstLower::
130 GetExternalSymbolSymbol(const MachineOperand &MO) const {
131 SmallString<128> Name;
132 Name += AsmPrinter.MAI->getGlobalPrefix();
133 Name += MO.getSymbolName();
135 switch (MO.getTargetFlags()) {
136 default: llvm_unreachable("Unknown target flag on GV operand");
137 case X86II::MO_NO_FLAG: // No flag.
138 case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name.
139 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
141 case X86II::MO_DLLIMPORT: {
142 // Handle dllimport linkage.
143 const char *Prefix = "__imp_";
144 Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
147 case X86II::MO_DARWIN_STUB: {
149 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
150 const MCSymbol *&StubSym = getMachOMMI().getFnStubEntry(Sym);
153 Name.erase(Name.end()-5, Name.end());
154 StubSym = Ctx.GetOrCreateSymbol(Name.str());
158 // FIXME: These probably should be a modifier on the symbol or something??
159 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
160 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
161 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
162 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
163 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
164 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
165 case X86II::MO_GOT: Name += "@GOT"; break;
166 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
167 case X86II::MO_PLT: Name += "@PLT"; break;
170 return Ctx.GetOrCreateSymbol(Name.str());
173 MCSymbol *X86MCInstLower::GetJumpTableSymbol(const MachineOperand &MO) const {
174 SmallString<256> Name;
175 raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "JTI"
176 << AsmPrinter.getFunctionNumber() << '_' << MO.getIndex();
178 switch (MO.getTargetFlags()) {
180 llvm_unreachable("Unknown target flag on GV operand");
181 case X86II::MO_NO_FLAG: // No flag.
182 case X86II::MO_PIC_BASE_OFFSET:
183 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
184 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
186 // FIXME: These probably should be a modifier on the symbol or something??
187 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
188 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
189 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
190 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
191 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
192 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
193 case X86II::MO_GOT: Name += "@GOT"; break;
194 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
195 case X86II::MO_PLT: Name += "@PLT"; break;
198 // Create a symbol for the name.
199 return Ctx.GetOrCreateSymbol(Name.str());
203 MCSymbol *X86MCInstLower::
204 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
205 SmallString<256> Name;
206 raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "CPI"
207 << AsmPrinter.getFunctionNumber() << '_' << MO.getIndex();
209 switch (MO.getTargetFlags()) {
211 llvm_unreachable("Unknown target flag on GV operand");
212 case X86II::MO_NO_FLAG: // No flag.
213 case X86II::MO_PIC_BASE_OFFSET:
214 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
215 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
217 // FIXME: These probably should be a modifier on the symbol or something??
218 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
219 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
220 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
221 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
222 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
223 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
224 case X86II::MO_GOT: Name += "@GOT"; break;
225 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
226 case X86II::MO_PLT: Name += "@PLT"; break;
229 // Create a symbol for the name.
230 return Ctx.GetOrCreateSymbol(Name.str());
233 MCOperand X86MCInstLower::LowerSymbolOperand(const MachineOperand &MO,
234 MCSymbol *Sym) const {
235 // FIXME: We would like an efficient form for this, so we don't have to do a
236 // lot of extra uniquing.
237 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
239 switch (MO.getTargetFlags()) {
240 default: llvm_unreachable("Unknown target flag on GV operand");
241 case X86II::MO_NO_FLAG: // No flag.
243 // These affect the name of the symbol, not any suffix.
244 case X86II::MO_DARWIN_NONLAZY:
245 case X86II::MO_DLLIMPORT:
246 case X86II::MO_DARWIN_STUB:
247 case X86II::MO_TLSGD:
248 case X86II::MO_GOTTPOFF:
249 case X86II::MO_INDNTPOFF:
250 case X86II::MO_TPOFF:
251 case X86II::MO_NTPOFF:
252 case X86II::MO_GOTPCREL:
254 case X86II::MO_GOTOFF:
257 case X86II::MO_PIC_BASE_OFFSET:
258 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
259 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
260 // Subtract the pic base.
261 Expr = MCBinaryExpr::CreateSub(Expr,
262 MCSymbolRefExpr::Create(GetPICBaseSymbol(), Ctx),
267 if (!MO.isJTI() && MO.getOffset())
268 Expr = MCBinaryExpr::CreateAdd(Expr,
269 MCConstantExpr::Create(MO.getOffset(), Ctx),
271 return MCOperand::CreateExpr(Expr);
276 static void lower_subreg32(MCInst *MI, unsigned OpNo) {
277 // Convert registers in the addr mode according to subreg32.
278 unsigned Reg = MI->getOperand(OpNo).getReg();
280 MI->getOperand(OpNo).setReg(getX86SubSuperRegister(Reg, MVT::i32));
283 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
284 // Convert registers in the addr mode according to subreg64.
285 for (unsigned i = 0; i != 4; ++i) {
286 if (!MI->getOperand(OpNo+i).isReg()) continue;
288 unsigned Reg = MI->getOperand(OpNo+i).getReg();
289 if (Reg == 0) continue;
291 MI->getOperand(OpNo+i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
297 void X86MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
298 OutMI.setOpcode(MI->getOpcode());
300 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
301 const MachineOperand &MO = MI->getOperand(i);
304 switch (MO.getType()) {
307 llvm_unreachable("unknown operand type");
308 case MachineOperand::MO_Register:
309 // Ignore all implicit register operands.
310 if (MO.isImplicit()) continue;
311 MCOp = MCOperand::CreateReg(MO.getReg());
313 case MachineOperand::MO_Immediate:
314 MCOp = MCOperand::CreateImm(MO.getImm());
316 case MachineOperand::MO_MachineBasicBlock:
317 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
318 AsmPrinter.GetMBBSymbol(MO.getMBB()->getNumber()), Ctx));
320 case MachineOperand::MO_GlobalAddress:
321 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
323 case MachineOperand::MO_ExternalSymbol:
324 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
326 case MachineOperand::MO_JumpTableIndex:
327 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
329 case MachineOperand::MO_ConstantPoolIndex:
330 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
332 case MachineOperand::MO_BlockAddress:
333 MCOp = LowerSymbolOperand(MO, AsmPrinter.GetBlockAddressSymbol(
334 MO.getBlockAddress()));
338 OutMI.addOperand(MCOp);
341 // Handle a few special cases to eliminate operand modifiers.
342 switch (OutMI.getOpcode()) {
343 case X86::LEA64_32r: // Handle 'subreg rewriting' for the lea64_32mem operand.
344 lower_lea64_32mem(&OutMI, 1);
347 OutMI.setOpcode(X86::MOV32r0);
348 lower_subreg32(&OutMI, 0);
350 case X86::MOVZX16rr8:
351 OutMI.setOpcode(X86::MOVZX32rr8);
352 lower_subreg32(&OutMI, 0);
354 case X86::MOVZX16rm8:
355 OutMI.setOpcode(X86::MOVZX32rm8);
356 lower_subreg32(&OutMI, 0);
358 case X86::MOVSX16rr8:
359 OutMI.setOpcode(X86::MOVSX32rr8);
360 lower_subreg32(&OutMI, 0);
362 case X86::MOVSX16rm8:
363 OutMI.setOpcode(X86::MOVSX32rm8);
364 lower_subreg32(&OutMI, 0);
366 case X86::MOVZX64rr32:
367 OutMI.setOpcode(X86::MOV32rr);
368 lower_subreg32(&OutMI, 0);
370 case X86::MOVZX64rm32:
371 OutMI.setOpcode(X86::MOV32rm);
372 lower_subreg32(&OutMI, 0);
374 case X86::MOV64ri64i32:
375 OutMI.setOpcode(X86::MOV32ri);
376 lower_subreg32(&OutMI, 0);
378 case X86::MOVZX64rr8:
379 OutMI.setOpcode(X86::MOVZX32rr8);
380 lower_subreg32(&OutMI, 0);
382 case X86::MOVZX64rm8:
383 OutMI.setOpcode(X86::MOVZX32rm8);
384 lower_subreg32(&OutMI, 0);
386 case X86::MOVZX64rr16:
387 OutMI.setOpcode(X86::MOVZX32rr16);
388 lower_subreg32(&OutMI, 0);
390 case X86::MOVZX64rm16:
391 OutMI.setOpcode(X86::MOVZX32rm16);
392 lower_subreg32(&OutMI, 0);
399 void X86AsmPrinter::printInstructionThroughMCStreamer(const MachineInstr *MI) {
400 X86MCInstLower MCInstLowering(OutContext, Mang, *this);
401 switch (MI->getOpcode()) {
402 case TargetInstrInfo::DBG_LABEL:
403 case TargetInstrInfo::EH_LABEL:
404 case TargetInstrInfo::GC_LABEL:
407 case TargetInstrInfo::INLINEASM:
410 case TargetInstrInfo::IMPLICIT_DEF:
411 printImplicitDef(MI);
413 case TargetInstrInfo::KILL:
416 case X86::MOVPC32r: {
418 // This is a pseudo op for a two instruction sequence with a label, which
425 MCSymbol *PICBase = MCInstLowering.GetPICBaseSymbol();
426 TmpInst.setOpcode(X86::CALLpcrel32);
427 // FIXME: We would like an efficient form for this, so we don't have to do a
428 // lot of extra uniquing.
429 TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
431 printMCInst(&TmpInst);
435 OutStreamer.EmitLabel(PICBase);
438 TmpInst.setOpcode(X86::POP32r);
439 TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
440 printMCInst(&TmpInst);
445 // Lower the MO_GOT_ABSOLUTE_ADDRESS form of ADD32ri.
446 if (MI->getOperand(2).getTargetFlags() != X86II::MO_GOT_ABSOLUTE_ADDRESS)
449 // Okay, we have something like:
450 // EAX = ADD32ri EAX, MO_GOT_ABSOLUTE_ADDRESS(@MYGLOBAL)
452 // For this, we want to print something like:
453 // MYGLOBAL + (. - PICBASE)
454 // However, we can't generate a ".", so just emit a new label here and refer
455 // to it. We know that this operand flag occurs at most once per function.
456 const char *Prefix = MAI->getPrivateGlobalPrefix();
457 MCSymbol *DotSym = OutContext.GetOrCreateSymbol(Twine(Prefix)+"picbaseref"+
458 Twine(getFunctionNumber()));
459 OutStreamer.EmitLabel(DotSym);
461 // Now that we have emitted the label, lower the complex operand expression.
462 MCSymbol *OpSym = MCInstLowering.GetExternalSymbolSymbol(MI->getOperand(2));
464 const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext);
465 const MCExpr *PICBase =
466 MCSymbolRefExpr::Create(MCInstLowering.GetPICBaseSymbol(), OutContext);
467 DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext);
469 DotExpr = MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(OpSym,OutContext),
470 DotExpr, OutContext);
473 TmpInst.setOpcode(X86::ADD32ri);
474 TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(0).getReg()));
475 TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(1).getReg()));
476 TmpInst.addOperand(MCOperand::CreateExpr(DotExpr));
477 printMCInst(&TmpInst);
483 MCInstLowering.Lower(MI, TmpInst);
486 printMCInst(&TmpInst);