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"
28 #include "llvm/Analysis/DebugInfo.h"
32 const X86Subtarget &X86MCInstLower::getSubtarget() const {
33 return AsmPrinter.getSubtarget();
36 MachineModuleInfoMachO &X86MCInstLower::getMachOMMI() const {
37 assert(getSubtarget().isTargetDarwin() &&"Can only get MachO info on darwin");
38 return AsmPrinter.MMI->getObjFileInfo<MachineModuleInfoMachO>();
42 MCSymbol *X86MCInstLower::GetPICBaseSymbol() const {
43 return Ctx.GetOrCreateSymbol(Twine(AsmPrinter.MAI->getPrivateGlobalPrefix())+
44 Twine(AsmPrinter.getFunctionNumber())+"$pb");
47 /// LowerGlobalAddressOperand - Lower an MO_GlobalAddress operand to an
49 MCSymbol *X86MCInstLower::
50 GetGlobalAddressSymbol(const MachineOperand &MO) const {
51 const GlobalValue *GV = MO.getGlobal();
53 bool isImplicitlyPrivate = false;
54 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB ||
55 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
56 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
57 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
58 isImplicitlyPrivate = true;
60 SmallString<128> Name;
61 Mang->getNameWithPrefix(Name, GV, isImplicitlyPrivate);
63 if (getSubtarget().isTargetCygMing()) {
64 X86COFFMachineModuleInfo &COFFMMI =
65 AsmPrinter.MMI->getObjFileInfo<X86COFFMachineModuleInfo>();
66 COFFMMI.DecorateCygMingName(Name, GV, *AsmPrinter.TM.getTargetData());
69 switch (MO.getTargetFlags()) {
70 default: llvm_unreachable("Unknown target flag on GV operand");
71 case X86II::MO_NO_FLAG: // No flag.
72 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
74 case X86II::MO_DLLIMPORT: {
75 // Handle dllimport linkage.
76 const char *Prefix = "__imp_";
77 Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
80 case X86II::MO_DARWIN_NONLAZY:
81 case X86II::MO_DARWIN_NONLAZY_PIC_BASE: {
82 Name += "$non_lazy_ptr";
83 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
85 const MCSymbol *&StubSym = getMachOMMI().getGVStubEntry(Sym);
88 Mang->getNameWithPrefix(Name, GV, false);
89 StubSym = Ctx.GetOrCreateSymbol(Name.str());
93 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: {
94 Name += "$non_lazy_ptr";
95 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
96 const MCSymbol *&StubSym = getMachOMMI().getHiddenGVStubEntry(Sym);
99 Mang->getNameWithPrefix(Name, GV, false);
100 StubSym = Ctx.GetOrCreateSymbol(Name.str());
104 case X86II::MO_DARWIN_STUB: {
106 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
107 const MCSymbol *&StubSym = getMachOMMI().getFnStubEntry(Sym);
110 Mang->getNameWithPrefix(Name, GV, false);
111 StubSym = Ctx.GetOrCreateSymbol(Name.str());
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 return Ctx.GetOrCreateSymbol(Name.str());
130 MCSymbol *X86MCInstLower::
131 GetExternalSymbolSymbol(const MachineOperand &MO) const {
132 SmallString<128> Name;
133 Name += AsmPrinter.MAI->getGlobalPrefix();
134 Name += MO.getSymbolName();
136 switch (MO.getTargetFlags()) {
137 default: llvm_unreachable("Unknown target flag on GV operand");
138 case X86II::MO_NO_FLAG: // No flag.
139 case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name.
140 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
142 case X86II::MO_DLLIMPORT: {
143 // Handle dllimport linkage.
144 const char *Prefix = "__imp_";
145 Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
148 case X86II::MO_DARWIN_STUB: {
150 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
151 const MCSymbol *&StubSym = getMachOMMI().getFnStubEntry(Sym);
154 Name.erase(Name.end()-5, Name.end());
155 StubSym = Ctx.GetOrCreateSymbol(Name.str());
159 // FIXME: These probably should be a modifier on the symbol or something??
160 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
161 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
162 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
163 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
164 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
165 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
166 case X86II::MO_GOT: Name += "@GOT"; break;
167 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
168 case X86II::MO_PLT: Name += "@PLT"; break;
171 return Ctx.GetOrCreateSymbol(Name.str());
174 MCSymbol *X86MCInstLower::GetJumpTableSymbol(const MachineOperand &MO) const {
175 SmallString<256> Name;
176 raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "JTI"
177 << AsmPrinter.getFunctionNumber() << '_' << MO.getIndex();
179 switch (MO.getTargetFlags()) {
181 llvm_unreachable("Unknown target flag on GV operand");
182 case X86II::MO_NO_FLAG: // No flag.
183 case X86II::MO_PIC_BASE_OFFSET:
184 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
185 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
187 // FIXME: These probably should be a modifier on the symbol or something??
188 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
189 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
190 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
191 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
192 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
193 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
194 case X86II::MO_GOT: Name += "@GOT"; break;
195 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
196 case X86II::MO_PLT: Name += "@PLT"; break;
199 // Create a symbol for the name.
200 return Ctx.GetOrCreateSymbol(Name.str());
204 MCSymbol *X86MCInstLower::
205 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
206 SmallString<256> Name;
207 raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "CPI"
208 << AsmPrinter.getFunctionNumber() << '_' << MO.getIndex();
210 switch (MO.getTargetFlags()) {
212 llvm_unreachable("Unknown target flag on GV operand");
213 case X86II::MO_NO_FLAG: // No flag.
214 case X86II::MO_PIC_BASE_OFFSET:
215 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
216 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
218 // FIXME: These probably should be a modifier on the symbol or something??
219 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
220 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
221 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
222 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
223 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
224 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
225 case X86II::MO_GOT: Name += "@GOT"; break;
226 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
227 case X86II::MO_PLT: Name += "@PLT"; break;
230 // Create a symbol for the name.
231 return Ctx.GetOrCreateSymbol(Name.str());
234 MCSymbol *X86MCInstLower::
235 GetBlockAddressSymbol(const MachineOperand &MO) const {
236 const char *Suffix = "";
237 switch (MO.getTargetFlags()) {
238 default: llvm_unreachable("Unknown target flag on BA operand");
239 case X86II::MO_NO_FLAG: break; // No flag.
240 case X86II::MO_PIC_BASE_OFFSET: break; // Doesn't modify symbol name.
241 case X86II::MO_GOTOFF: Suffix = "@GOTOFF"; break;
244 return AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress(), Suffix);
247 MCOperand X86MCInstLower::LowerSymbolOperand(const MachineOperand &MO,
248 MCSymbol *Sym) const {
249 // FIXME: We would like an efficient form for this, so we don't have to do a
250 // lot of extra uniquing.
251 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
253 switch (MO.getTargetFlags()) {
254 default: llvm_unreachable("Unknown target flag on GV operand");
255 case X86II::MO_NO_FLAG: // No flag.
257 // These affect the name of the symbol, not any suffix.
258 case X86II::MO_DARWIN_NONLAZY:
259 case X86II::MO_DLLIMPORT:
260 case X86II::MO_DARWIN_STUB:
261 case X86II::MO_TLSGD:
262 case X86II::MO_GOTTPOFF:
263 case X86II::MO_INDNTPOFF:
264 case X86II::MO_TPOFF:
265 case X86II::MO_NTPOFF:
266 case X86II::MO_GOTPCREL:
268 case X86II::MO_GOTOFF:
271 case X86II::MO_PIC_BASE_OFFSET:
272 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
273 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
274 // Subtract the pic base.
275 Expr = MCBinaryExpr::CreateSub(Expr,
276 MCSymbolRefExpr::Create(GetPICBaseSymbol(), Ctx),
281 if (!MO.isJTI() && MO.getOffset())
282 Expr = MCBinaryExpr::CreateAdd(Expr,
283 MCConstantExpr::Create(MO.getOffset(), Ctx),
285 return MCOperand::CreateExpr(Expr);
290 static void lower_subreg32(MCInst *MI, unsigned OpNo) {
291 // Convert registers in the addr mode according to subreg32.
292 unsigned Reg = MI->getOperand(OpNo).getReg();
294 MI->getOperand(OpNo).setReg(getX86SubSuperRegister(Reg, MVT::i32));
297 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
298 // Convert registers in the addr mode according to subreg64.
299 for (unsigned i = 0; i != 4; ++i) {
300 if (!MI->getOperand(OpNo+i).isReg()) continue;
302 unsigned Reg = MI->getOperand(OpNo+i).getReg();
303 if (Reg == 0) continue;
305 MI->getOperand(OpNo+i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
311 void X86MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
312 OutMI.setOpcode(MI->getOpcode());
314 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
315 const MachineOperand &MO = MI->getOperand(i);
318 switch (MO.getType()) {
321 llvm_unreachable("unknown operand type");
322 case MachineOperand::MO_Register:
323 // Ignore all implicit register operands.
324 if (MO.isImplicit()) continue;
325 MCOp = MCOperand::CreateReg(MO.getReg());
327 case MachineOperand::MO_Immediate:
328 MCOp = MCOperand::CreateImm(MO.getImm());
330 case MachineOperand::MO_MachineBasicBlock:
331 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
332 AsmPrinter.GetMBBSymbol(MO.getMBB()->getNumber()), Ctx));
334 case MachineOperand::MO_GlobalAddress:
335 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
337 case MachineOperand::MO_ExternalSymbol:
338 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
340 case MachineOperand::MO_JumpTableIndex:
341 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
343 case MachineOperand::MO_ConstantPoolIndex:
344 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
346 case MachineOperand::MO_BlockAddress:
347 MCOp = LowerSymbolOperand(MO, GetBlockAddressSymbol(MO));
351 OutMI.addOperand(MCOp);
354 // Handle a few special cases to eliminate operand modifiers.
355 switch (OutMI.getOpcode()) {
356 case X86::LEA64_32r: // Handle 'subreg rewriting' for the lea64_32mem operand.
357 lower_lea64_32mem(&OutMI, 1);
359 case X86::MOVZX16rr8:
360 OutMI.setOpcode(X86::MOVZX32rr8);
361 lower_subreg32(&OutMI, 0);
363 case X86::MOVZX16rm8:
364 OutMI.setOpcode(X86::MOVZX32rm8);
365 lower_subreg32(&OutMI, 0);
367 case X86::MOVSX16rr8:
368 OutMI.setOpcode(X86::MOVSX32rr8);
369 lower_subreg32(&OutMI, 0);
371 case X86::MOVSX16rm8:
372 OutMI.setOpcode(X86::MOVSX32rm8);
373 lower_subreg32(&OutMI, 0);
375 case X86::MOVZX64rr32:
376 OutMI.setOpcode(X86::MOV32rr);
377 lower_subreg32(&OutMI, 0);
379 case X86::MOVZX64rm32:
380 OutMI.setOpcode(X86::MOV32rm);
381 lower_subreg32(&OutMI, 0);
383 case X86::MOV64ri64i32:
384 OutMI.setOpcode(X86::MOV32ri);
385 lower_subreg32(&OutMI, 0);
387 case X86::MOVZX64rr8:
388 OutMI.setOpcode(X86::MOVZX32rr8);
389 lower_subreg32(&OutMI, 0);
391 case X86::MOVZX64rm8:
392 OutMI.setOpcode(X86::MOVZX32rm8);
393 lower_subreg32(&OutMI, 0);
395 case X86::MOVZX64rr16:
396 OutMI.setOpcode(X86::MOVZX32rr16);
397 lower_subreg32(&OutMI, 0);
399 case X86::MOVZX64rm16:
400 OutMI.setOpcode(X86::MOVZX32rm16);
401 lower_subreg32(&OutMI, 0);
404 OutMI.setOpcode(X86::MOV32r0);
405 lower_subreg32(&OutMI, 0);
408 OutMI.setOpcode(X86::MOV32r0);
409 lower_subreg32(&OutMI, 0);
416 void X86AsmPrinter::printInstructionThroughMCStreamer(const MachineInstr *MI) {
417 X86MCInstLower MCInstLowering(OutContext, Mang, *this);
418 switch (MI->getOpcode()) {
419 case TargetInstrInfo::DBG_LABEL:
420 case TargetInstrInfo::EH_LABEL:
421 case TargetInstrInfo::GC_LABEL:
424 case TargetInstrInfo::DEBUG_VALUE: {
427 O << '\t' << MAI->getCommentString() << "DEBUG_VALUE: ";
428 // cast away const; DIetc do not take const operands for some reason
429 DIVariable V((MDNode*)(MI->getOperand(2).getMetadata()));
432 if (MI->getOperand(0).getType()==MachineOperand::MO_Register)
435 assert(MI->getOperand(0).getType()==MachineOperand::MO_Immediate);
436 int64_t imm = MI->getOperand(0).getImm();
437 O << '[' << ((imm<0) ? "EBP" : "ESP+") << imm << ']';
443 case TargetInstrInfo::INLINEASM:
446 case TargetInstrInfo::IMPLICIT_DEF:
447 printImplicitDef(MI);
449 case TargetInstrInfo::KILL:
452 case X86::MOVPC32r: {
454 // This is a pseudo op for a two instruction sequence with a label, which
461 MCSymbol *PICBase = MCInstLowering.GetPICBaseSymbol();
462 TmpInst.setOpcode(X86::CALLpcrel32);
463 // FIXME: We would like an efficient form for this, so we don't have to do a
464 // lot of extra uniquing.
465 TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
467 printMCInst(&TmpInst);
471 OutStreamer.EmitLabel(PICBase);
474 TmpInst.setOpcode(X86::POP32r);
475 TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
476 printMCInst(&TmpInst);
481 // Lower the MO_GOT_ABSOLUTE_ADDRESS form of ADD32ri.
482 if (MI->getOperand(2).getTargetFlags() != X86II::MO_GOT_ABSOLUTE_ADDRESS)
485 // Okay, we have something like:
486 // EAX = ADD32ri EAX, MO_GOT_ABSOLUTE_ADDRESS(@MYGLOBAL)
488 // For this, we want to print something like:
489 // MYGLOBAL + (. - PICBASE)
490 // However, we can't generate a ".", so just emit a new label here and refer
491 // to it. We know that this operand flag occurs at most once per function.
492 const char *Prefix = MAI->getPrivateGlobalPrefix();
493 MCSymbol *DotSym = OutContext.GetOrCreateSymbol(Twine(Prefix)+"picbaseref"+
494 Twine(getFunctionNumber()));
495 OutStreamer.EmitLabel(DotSym);
497 // Now that we have emitted the label, lower the complex operand expression.
498 MCSymbol *OpSym = MCInstLowering.GetExternalSymbolSymbol(MI->getOperand(2));
500 const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext);
501 const MCExpr *PICBase =
502 MCSymbolRefExpr::Create(MCInstLowering.GetPICBaseSymbol(), OutContext);
503 DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext);
505 DotExpr = MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(OpSym,OutContext),
506 DotExpr, OutContext);
509 TmpInst.setOpcode(X86::ADD32ri);
510 TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(0).getReg()));
511 TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(1).getReg()));
512 TmpInst.addOperand(MCOperand::CreateExpr(DotExpr));
513 printMCInst(&TmpInst);
519 MCInstLowering.Lower(MI, TmpInst);
522 printMCInst(&TmpInst);