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/ErrorHandling.h"
25 #include "llvm/Support/FormattedStream.h"
26 #include "llvm/Support/Mangler.h"
27 #include "llvm/ADT/SmallString.h"
31 const X86Subtarget &X86MCInstLower::getSubtarget() const {
32 return AsmPrinter.getSubtarget();
35 MachineModuleInfoMachO &X86MCInstLower::getMachOMMI() const {
36 assert(getSubtarget().isTargetDarwin() &&"Can only get MachO info on darwin");
37 return AsmPrinter.MMI->getObjFileInfo<MachineModuleInfoMachO>();
41 MCSymbol *X86MCInstLower::GetPICBaseSymbol() const {
42 return Ctx.GetOrCreateSymbol(Twine(AsmPrinter.MAI->getPrivateGlobalPrefix())+
43 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 MCSymbol *X86MCInstLower::
234 GetBlockAddressSymbol(const MachineOperand &MO) const {
235 const char *Suffix = "";
236 switch (MO.getTargetFlags()) {
237 default: llvm_unreachable("Unknown target flag on BA operand");
238 case X86II::MO_NO_FLAG: break; // No flag.
239 case X86II::MO_PIC_BASE_OFFSET: break; // Doesn't modify symbol name.
240 case X86II::MO_GOTOFF: Suffix = "@GOTOFF"; break;
243 return AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress(), Suffix);
246 MCOperand X86MCInstLower::LowerSymbolOperand(const MachineOperand &MO,
247 MCSymbol *Sym) const {
248 // FIXME: We would like an efficient form for this, so we don't have to do a
249 // lot of extra uniquing.
250 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
252 switch (MO.getTargetFlags()) {
253 default: llvm_unreachable("Unknown target flag on GV operand");
254 case X86II::MO_NO_FLAG: // No flag.
256 // These affect the name of the symbol, not any suffix.
257 case X86II::MO_DARWIN_NONLAZY:
258 case X86II::MO_DLLIMPORT:
259 case X86II::MO_DARWIN_STUB:
260 case X86II::MO_TLSGD:
261 case X86II::MO_GOTTPOFF:
262 case X86II::MO_INDNTPOFF:
263 case X86II::MO_TPOFF:
264 case X86II::MO_NTPOFF:
265 case X86II::MO_GOTPCREL:
267 case X86II::MO_GOTOFF:
270 case X86II::MO_PIC_BASE_OFFSET:
271 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
272 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
273 // Subtract the pic base.
274 Expr = MCBinaryExpr::CreateSub(Expr,
275 MCSymbolRefExpr::Create(GetPICBaseSymbol(), Ctx),
280 if (!MO.isJTI() && MO.getOffset())
281 Expr = MCBinaryExpr::CreateAdd(Expr,
282 MCConstantExpr::Create(MO.getOffset(), Ctx),
284 return MCOperand::CreateExpr(Expr);
289 static void lower_subreg32(MCInst *MI, unsigned OpNo) {
290 // Convert registers in the addr mode according to subreg32.
291 unsigned Reg = MI->getOperand(OpNo).getReg();
293 MI->getOperand(OpNo).setReg(getX86SubSuperRegister(Reg, MVT::i32));
296 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
297 // Convert registers in the addr mode according to subreg64.
298 for (unsigned i = 0; i != 4; ++i) {
299 if (!MI->getOperand(OpNo+i).isReg()) continue;
301 unsigned Reg = MI->getOperand(OpNo+i).getReg();
302 if (Reg == 0) continue;
304 MI->getOperand(OpNo+i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
310 void X86MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
311 OutMI.setOpcode(MI->getOpcode());
313 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
314 const MachineOperand &MO = MI->getOperand(i);
317 switch (MO.getType()) {
320 llvm_unreachable("unknown operand type");
321 case MachineOperand::MO_Register:
322 // Ignore all implicit register operands.
323 if (MO.isImplicit()) continue;
324 MCOp = MCOperand::CreateReg(MO.getReg());
326 case MachineOperand::MO_Immediate:
327 MCOp = MCOperand::CreateImm(MO.getImm());
329 case MachineOperand::MO_MachineBasicBlock:
330 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
331 AsmPrinter.GetMBBSymbol(MO.getMBB()->getNumber()), Ctx));
333 case MachineOperand::MO_GlobalAddress:
334 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
336 case MachineOperand::MO_ExternalSymbol:
337 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
339 case MachineOperand::MO_JumpTableIndex:
340 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
342 case MachineOperand::MO_ConstantPoolIndex:
343 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
345 case MachineOperand::MO_BlockAddress:
346 MCOp = LowerSymbolOperand(MO, GetBlockAddressSymbol(MO));
350 OutMI.addOperand(MCOp);
353 // Handle a few special cases to eliminate operand modifiers.
354 switch (OutMI.getOpcode()) {
355 case X86::LEA64_32r: // Handle 'subreg rewriting' for the lea64_32mem operand.
356 lower_lea64_32mem(&OutMI, 1);
358 case X86::MOVZX16rr8:
359 OutMI.setOpcode(X86::MOVZX32rr8);
360 lower_subreg32(&OutMI, 0);
362 case X86::MOVZX16rm8:
363 OutMI.setOpcode(X86::MOVZX32rm8);
364 lower_subreg32(&OutMI, 0);
366 case X86::MOVSX16rr8:
367 OutMI.setOpcode(X86::MOVSX32rr8);
368 lower_subreg32(&OutMI, 0);
370 case X86::MOVSX16rm8:
371 OutMI.setOpcode(X86::MOVSX32rm8);
372 lower_subreg32(&OutMI, 0);
374 case X86::MOVZX64rr32:
375 OutMI.setOpcode(X86::MOV32rr);
376 lower_subreg32(&OutMI, 0);
378 case X86::MOVZX64rm32:
379 OutMI.setOpcode(X86::MOV32rm);
380 lower_subreg32(&OutMI, 0);
382 case X86::MOV64ri64i32:
383 OutMI.setOpcode(X86::MOV32ri);
384 lower_subreg32(&OutMI, 0);
386 case X86::MOVZX64rr8:
387 OutMI.setOpcode(X86::MOVZX32rr8);
388 lower_subreg32(&OutMI, 0);
390 case X86::MOVZX64rm8:
391 OutMI.setOpcode(X86::MOVZX32rm8);
392 lower_subreg32(&OutMI, 0);
394 case X86::MOVZX64rr16:
395 OutMI.setOpcode(X86::MOVZX32rr16);
396 lower_subreg32(&OutMI, 0);
398 case X86::MOVZX64rm16:
399 OutMI.setOpcode(X86::MOVZX32rm16);
400 lower_subreg32(&OutMI, 0);
403 OutMI.setOpcode(X86::MOV32r0);
404 lower_subreg32(&OutMI, 0);
407 OutMI.setOpcode(X86::MOV32r0);
408 lower_subreg32(&OutMI, 0);
415 void X86AsmPrinter::printInstructionThroughMCStreamer(const MachineInstr *MI) {
416 X86MCInstLower MCInstLowering(OutContext, Mang, *this);
417 switch (MI->getOpcode()) {
418 case TargetInstrInfo::DBG_LABEL:
419 case TargetInstrInfo::EH_LABEL:
420 case TargetInstrInfo::GC_LABEL:
423 case TargetInstrInfo::INLINEASM:
426 case TargetInstrInfo::IMPLICIT_DEF:
427 printImplicitDef(MI);
429 case TargetInstrInfo::KILL:
432 case X86::MOVPC32r: {
434 // This is a pseudo op for a two instruction sequence with a label, which
441 MCSymbol *PICBase = MCInstLowering.GetPICBaseSymbol();
442 TmpInst.setOpcode(X86::CALLpcrel32);
443 // FIXME: We would like an efficient form for this, so we don't have to do a
444 // lot of extra uniquing.
445 TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
447 printMCInst(&TmpInst);
451 OutStreamer.EmitLabel(PICBase);
454 TmpInst.setOpcode(X86::POP32r);
455 TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
456 printMCInst(&TmpInst);
461 // Lower the MO_GOT_ABSOLUTE_ADDRESS form of ADD32ri.
462 if (MI->getOperand(2).getTargetFlags() != X86II::MO_GOT_ABSOLUTE_ADDRESS)
465 // Okay, we have something like:
466 // EAX = ADD32ri EAX, MO_GOT_ABSOLUTE_ADDRESS(@MYGLOBAL)
468 // For this, we want to print something like:
469 // MYGLOBAL + (. - PICBASE)
470 // However, we can't generate a ".", so just emit a new label here and refer
471 // to it. We know that this operand flag occurs at most once per function.
472 const char *Prefix = MAI->getPrivateGlobalPrefix();
473 MCSymbol *DotSym = OutContext.GetOrCreateSymbol(Twine(Prefix)+"picbaseref"+
474 Twine(getFunctionNumber()));
475 OutStreamer.EmitLabel(DotSym);
477 // Now that we have emitted the label, lower the complex operand expression.
478 MCSymbol *OpSym = MCInstLowering.GetExternalSymbolSymbol(MI->getOperand(2));
480 const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext);
481 const MCExpr *PICBase =
482 MCSymbolRefExpr::Create(MCInstLowering.GetPICBaseSymbol(), OutContext);
483 DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext);
485 DotExpr = MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(OpSym,OutContext),
486 DotExpr, OutContext);
489 TmpInst.setOpcode(X86::ADD32ri);
490 TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(0).getReg()));
491 TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(1).getReg()));
492 TmpInst.addOperand(MCOperand::CreateExpr(DotExpr));
493 printMCInst(&TmpInst);
499 MCInstLowering.Lower(MI, TmpInst);
502 printMCInst(&TmpInst);