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 {
42 raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix()
43 << AsmPrinter.getFunctionNumber() << "$pb";
44 return Ctx.GetOrCreateSymbol(Name.str());
48 /// LowerGlobalAddressOperand - Lower an MO_GlobalAddress operand to an
50 MCSymbol *X86MCInstLower::
51 GetGlobalAddressSymbol(const MachineOperand &MO) const {
52 const GlobalValue *GV = MO.getGlobal();
54 bool isImplicitlyPrivate = false;
55 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB ||
56 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
57 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
58 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
59 isImplicitlyPrivate = true;
61 SmallString<128> Name;
62 Mang->getNameWithPrefix(Name, GV, isImplicitlyPrivate);
64 if (getSubtarget().isTargetCygMing()) {
65 X86COFFMachineModuleInfo &COFFMMI =
66 AsmPrinter.MMI->getObjFileInfo<X86COFFMachineModuleInfo>();
67 COFFMMI.DecorateCygMingName(Name, GV, *AsmPrinter.TM.getTargetData());
70 switch (MO.getTargetFlags()) {
71 default: llvm_unreachable("Unknown target flag on GV operand");
72 case X86II::MO_NO_FLAG: // No flag.
73 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
75 case X86II::MO_DLLIMPORT: {
76 // Handle dllimport linkage.
77 const char *Prefix = "__imp_";
78 Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
81 case X86II::MO_DARWIN_NONLAZY:
82 case X86II::MO_DARWIN_NONLAZY_PIC_BASE: {
83 Name += "$non_lazy_ptr";
84 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
86 const MCSymbol *&StubSym = getMachOMMI().getGVStubEntry(Sym);
89 Mang->getNameWithPrefix(Name, GV, false);
90 StubSym = Ctx.GetOrCreateSymbol(Name.str());
94 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: {
95 Name += "$non_lazy_ptr";
96 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
97 const MCSymbol *&StubSym = getMachOMMI().getHiddenGVStubEntry(Sym);
100 Mang->getNameWithPrefix(Name, GV, false);
101 StubSym = Ctx.GetOrCreateSymbol(Name.str());
105 case X86II::MO_DARWIN_STUB: {
107 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
108 const MCSymbol *&StubSym = getMachOMMI().getFnStubEntry(Sym);
111 Mang->getNameWithPrefix(Name, GV, false);
112 StubSym = Ctx.GetOrCreateSymbol(Name.str());
116 // FIXME: These probably should be a modifier on the symbol or something??
117 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
118 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
119 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
120 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
121 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
122 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
123 case X86II::MO_GOT: Name += "@GOT"; break;
124 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
125 case X86II::MO_PLT: Name += "@PLT"; break;
128 return Ctx.GetOrCreateSymbol(Name.str());
131 MCSymbol *X86MCInstLower::
132 GetExternalSymbolSymbol(const MachineOperand &MO) const {
133 SmallString<128> Name;
134 Name += AsmPrinter.MAI->getGlobalPrefix();
135 Name += MO.getSymbolName();
137 switch (MO.getTargetFlags()) {
138 default: llvm_unreachable("Unknown target flag on GV operand");
139 case X86II::MO_NO_FLAG: // No flag.
140 case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name.
141 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
143 case X86II::MO_DLLIMPORT: {
144 // Handle dllimport linkage.
145 const char *Prefix = "__imp_";
146 Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
149 case X86II::MO_DARWIN_STUB: {
151 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
152 const MCSymbol *&StubSym = getMachOMMI().getFnStubEntry(Sym);
155 Name.erase(Name.end()-5, Name.end());
156 StubSym = Ctx.GetOrCreateSymbol(Name.str());
160 // FIXME: These probably should be a modifier on the symbol or something??
161 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
162 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
163 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
164 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
165 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
166 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
167 case X86II::MO_GOT: Name += "@GOT"; break;
168 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
169 case X86II::MO_PLT: Name += "@PLT"; break;
172 return Ctx.GetOrCreateSymbol(Name.str());
175 MCSymbol *X86MCInstLower::GetJumpTableSymbol(const MachineOperand &MO) const {
176 SmallString<256> Name;
177 raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "JTI"
178 << AsmPrinter.getFunctionNumber() << '_' << MO.getIndex();
180 switch (MO.getTargetFlags()) {
182 llvm_unreachable("Unknown target flag on GV operand");
183 case X86II::MO_NO_FLAG: // No flag.
184 case X86II::MO_PIC_BASE_OFFSET:
185 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
186 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
188 // FIXME: These probably should be a modifier on the symbol or something??
189 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
190 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
191 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
192 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
193 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
194 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
195 case X86II::MO_GOT: Name += "@GOT"; break;
196 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
197 case X86II::MO_PLT: Name += "@PLT"; break;
200 // Create a symbol for the name.
201 return Ctx.GetOrCreateSymbol(Name.str());
205 MCSymbol *X86MCInstLower::
206 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
207 SmallString<256> Name;
208 raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "CPI"
209 << AsmPrinter.getFunctionNumber() << '_' << MO.getIndex();
211 switch (MO.getTargetFlags()) {
213 llvm_unreachable("Unknown target flag on GV operand");
214 case X86II::MO_NO_FLAG: // No flag.
215 case X86II::MO_PIC_BASE_OFFSET:
216 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
217 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
219 // FIXME: These probably should be a modifier on the symbol or something??
220 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
221 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
222 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
223 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
224 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
225 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
226 case X86II::MO_GOT: Name += "@GOT"; break;
227 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
228 case X86II::MO_PLT: Name += "@PLT"; break;
231 // Create a symbol for the name.
232 return Ctx.GetOrCreateSymbol(Name.str());
235 MCOperand X86MCInstLower::LowerSymbolOperand(const MachineOperand &MO,
236 MCSymbol *Sym) const {
237 // FIXME: We would like an efficient form for this, so we don't have to do a
238 // lot of extra uniquing.
239 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
241 switch (MO.getTargetFlags()) {
242 default: llvm_unreachable("Unknown target flag on GV operand");
243 case X86II::MO_NO_FLAG: // No flag.
245 // These affect the name of the symbol, not any suffix.
246 case X86II::MO_DARWIN_NONLAZY:
247 case X86II::MO_DLLIMPORT:
248 case X86II::MO_DARWIN_STUB:
249 case X86II::MO_TLSGD:
250 case X86II::MO_GOTTPOFF:
251 case X86II::MO_INDNTPOFF:
252 case X86II::MO_TPOFF:
253 case X86II::MO_NTPOFF:
254 case X86II::MO_GOTPCREL:
256 case X86II::MO_GOTOFF:
259 case X86II::MO_PIC_BASE_OFFSET:
260 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
261 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
262 // Subtract the pic base.
263 Expr = MCBinaryExpr::CreateSub(Expr,
264 MCSymbolRefExpr::Create(GetPICBaseSymbol(), Ctx),
269 if (!MO.isJTI() && MO.getOffset())
270 Expr = MCBinaryExpr::CreateAdd(Expr,
271 MCConstantExpr::Create(MO.getOffset(), Ctx),
273 return MCOperand::CreateExpr(Expr);
278 static void lower_subreg32(MCInst *MI, unsigned OpNo) {
279 // Convert registers in the addr mode according to subreg32.
280 unsigned Reg = MI->getOperand(OpNo).getReg();
282 MI->getOperand(OpNo).setReg(getX86SubSuperRegister(Reg, MVT::i32));
285 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
286 // Convert registers in the addr mode according to subreg64.
287 for (unsigned i = 0; i != 4; ++i) {
288 if (!MI->getOperand(OpNo+i).isReg()) continue;
290 unsigned Reg = MI->getOperand(OpNo+i).getReg();
291 if (Reg == 0) continue;
293 MI->getOperand(OpNo+i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
299 void X86MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
300 OutMI.setOpcode(MI->getOpcode());
302 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
303 const MachineOperand &MO = MI->getOperand(i);
306 switch (MO.getType()) {
309 llvm_unreachable("unknown operand type");
310 case MachineOperand::MO_Register:
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));
334 OutMI.addOperand(MCOp);
337 // Handle a few special cases to eliminate operand modifiers.
338 switch (OutMI.getOpcode()) {
339 case X86::LEA64_32r: // Handle 'subreg rewriting' for the lea64_32mem operand.
340 lower_lea64_32mem(&OutMI, 1);
343 OutMI.setOpcode(X86::MOV32r0);
344 lower_subreg32(&OutMI, 0);
346 case X86::MOVZX16rr8:
347 OutMI.setOpcode(X86::MOVZX32rr8);
348 lower_subreg32(&OutMI, 0);
350 case X86::MOVZX16rm8:
351 OutMI.setOpcode(X86::MOVZX32rm8);
352 lower_subreg32(&OutMI, 0);
354 case X86::MOVSX16rr8:
355 OutMI.setOpcode(X86::MOVSX32rr8);
356 lower_subreg32(&OutMI, 0);
358 case X86::MOVSX16rm8:
359 OutMI.setOpcode(X86::MOVSX32rm8);
360 lower_subreg32(&OutMI, 0);
362 case X86::MOVZX64rr32:
363 OutMI.setOpcode(X86::MOV32rr);
364 lower_subreg32(&OutMI, 0);
366 case X86::MOVZX64rm32:
367 OutMI.setOpcode(X86::MOV32rm);
368 lower_subreg32(&OutMI, 0);
370 case X86::MOV64ri64i32:
371 OutMI.setOpcode(X86::MOV32ri);
372 lower_subreg32(&OutMI, 0);
374 case X86::MOVZX64rr8:
375 OutMI.setOpcode(X86::MOVZX32rr8);
376 lower_subreg32(&OutMI, 0);
378 case X86::MOVZX64rm8:
379 OutMI.setOpcode(X86::MOVZX32rm8);
380 lower_subreg32(&OutMI, 0);
382 case X86::MOVZX64rr16:
383 OutMI.setOpcode(X86::MOVZX32rr16);
384 lower_subreg32(&OutMI, 0);
386 case X86::MOVZX64rm16:
387 OutMI.setOpcode(X86::MOVZX32rm16);
388 lower_subreg32(&OutMI, 0);
395 void X86AsmPrinter::printInstructionThroughMCStreamer(const MachineInstr *MI) {
396 X86MCInstLower MCInstLowering(OutContext, Mang, *this);
397 switch (MI->getOpcode()) {
398 case TargetInstrInfo::DBG_LABEL:
399 case TargetInstrInfo::EH_LABEL:
400 case TargetInstrInfo::GC_LABEL:
403 case TargetInstrInfo::INLINEASM:
407 case TargetInstrInfo::IMPLICIT_DEF:
408 printImplicitDef(MI);
410 case X86::MOVPC32r: {
412 // This is a pseudo op for a two instruction sequence with a label, which
419 MCSymbol *PICBase = MCInstLowering.GetPICBaseSymbol();
420 TmpInst.setOpcode(X86::CALLpcrel32);
421 // FIXME: We would like an efficient form for this, so we don't have to do a
422 // lot of extra uniquing.
423 TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
425 printMCInst(&TmpInst);
429 OutStreamer.EmitLabel(PICBase);
432 TmpInst.setOpcode(X86::POP32r);
433 TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
434 printMCInst(&TmpInst);
439 // Lower the MO_GOT_ABSOLUTE_ADDRESS form of ADD32ri.
440 if (MI->getOperand(2).getTargetFlags() != X86II::MO_GOT_ABSOLUTE_ADDRESS)
443 // Okay, we have something like:
444 // EAX = ADD32ri EAX, MO_GOT_ABSOLUTE_ADDRESS(@MYGLOBAL)
446 // For this, we want to print something like:
447 // MYGLOBAL + (. - PICBASE)
448 // However, we can't generate a ".", so just emit a new label here and refer
449 // to it. We know that this operand flag occurs at most once per function.
450 SmallString<64> Name;
451 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix()
452 << "picbaseref" << getFunctionNumber();
453 MCSymbol *DotSym = OutContext.GetOrCreateSymbol(Name.str());
454 OutStreamer.EmitLabel(DotSym);
456 // Now that we have emitted the label, lower the complex operand expression.
457 MCSymbol *OpSym = MCInstLowering.GetExternalSymbolSymbol(MI->getOperand(2));
459 const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext);
460 const MCExpr *PICBase =
461 MCSymbolRefExpr::Create(MCInstLowering.GetPICBaseSymbol(), OutContext);
462 DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext);
464 DotExpr = MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(OpSym,OutContext),
465 DotExpr, OutContext);
468 TmpInst.setOpcode(X86::ADD32ri);
469 TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(0).getReg()));
470 TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(1).getReg()));
471 TmpInst.addOperand(MCOperand::CreateExpr(DotExpr));
472 printMCInst(&TmpInst);
478 MCInstLowering.Lower(MI, TmpInst);
481 printMCInst(&TmpInst);