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/Analysis/DebugInfo.h"
20 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
21 #include "llvm/MC/MCContext.h"
22 #include "llvm/MC/MCExpr.h"
23 #include "llvm/MC/MCInst.h"
24 #include "llvm/MC/MCStreamer.h"
25 #include "llvm/Target/Mangler.h"
26 #include "llvm/Support/FormattedStream.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 const TargetLowering *TLI = AsmPrinter.TM.getTargetLowering();
43 return static_cast<const X86TargetLowering*>(TLI)->
44 getPICBaseSymbol(AsmPrinter.MF, Ctx);
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 += "$non_lazy_ptr";
83 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
85 const MCSymbol *&StubSym = getMachOMMI().getGVStubEntry(Sym);
87 StubSym = AsmPrinter.GetGlobalValueSymbol(GV);
90 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: {
91 Name += "$non_lazy_ptr";
92 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
93 const MCSymbol *&StubSym = getMachOMMI().getHiddenGVStubEntry(Sym);
95 StubSym = AsmPrinter.GetGlobalValueSymbol(GV);
98 case X86II::MO_DARWIN_STUB: {
100 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
101 const MCSymbol *&StubSym = getMachOMMI().getFnStubEntry(Sym);
103 StubSym = AsmPrinter.GetGlobalValueSymbol(GV);
106 // FIXME: These probably should be a modifier on the symbol or something??
107 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
108 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
109 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
110 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
111 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
112 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
113 case X86II::MO_GOT: Name += "@GOT"; break;
114 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
115 case X86II::MO_PLT: Name += "@PLT"; break;
118 return Ctx.GetOrCreateSymbol(Name.str());
121 MCSymbol *X86MCInstLower::
122 GetExternalSymbolSymbol(const MachineOperand &MO) const {
123 SmallString<128> Name;
124 Name += AsmPrinter.MAI->getGlobalPrefix();
125 Name += MO.getSymbolName();
127 switch (MO.getTargetFlags()) {
128 default: llvm_unreachable("Unknown target flag on GV operand");
129 case X86II::MO_NO_FLAG: // No flag.
130 case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name.
131 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
133 case X86II::MO_DLLIMPORT: {
134 // Handle dllimport linkage.
135 const char *Prefix = "__imp_";
136 Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
139 case X86II::MO_DARWIN_STUB: {
141 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
142 const MCSymbol *&StubSym = getMachOMMI().getFnStubEntry(Sym);
145 Name.erase(Name.end()-5, Name.end());
146 StubSym = Ctx.GetOrCreateSymbol(Name.str());
150 // FIXME: These probably should be a modifier on the symbol or something??
151 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
152 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
153 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
154 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
155 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
156 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
157 case X86II::MO_GOT: Name += "@GOT"; break;
158 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
159 case X86II::MO_PLT: Name += "@PLT"; break;
162 return Ctx.GetOrCreateSymbol(Name.str());
165 MCSymbol *X86MCInstLower::GetJumpTableSymbol(const MachineOperand &MO) const {
166 SmallString<256> Name;
167 // FIXME: Use AsmPrinter.GetJTISymbol. @TLSGD shouldn't be part of the symbol
169 raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "JTI"
170 << AsmPrinter.getFunctionNumber() << '_' << MO.getIndex();
172 switch (MO.getTargetFlags()) {
174 llvm_unreachable("Unknown target flag on GV operand");
175 case X86II::MO_NO_FLAG: // No flag.
176 case X86II::MO_PIC_BASE_OFFSET:
177 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
178 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
180 // FIXME: These probably should be a modifier on the symbol or something??
181 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
182 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
183 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
184 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
185 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
186 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
187 case X86II::MO_GOT: Name += "@GOT"; break;
188 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
189 case X86II::MO_PLT: Name += "@PLT"; break;
192 // Create a symbol for the name.
193 return Ctx.GetOrCreateSymbol(Name.str());
197 MCSymbol *X86MCInstLower::
198 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
199 SmallString<256> Name;
200 // FIXME: USe AsmPrinter.GetCPISymbol. @TLSGD shouldn't be part of the symbol
202 raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "CPI"
203 << AsmPrinter.getFunctionNumber() << '_' << MO.getIndex();
205 switch (MO.getTargetFlags()) {
207 llvm_unreachable("Unknown target flag on GV operand");
208 case X86II::MO_NO_FLAG: // No flag.
209 case X86II::MO_PIC_BASE_OFFSET:
210 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
211 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
213 // FIXME: These probably should be a modifier on the symbol or something??
214 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
215 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
216 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
217 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
218 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
219 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
220 case X86II::MO_GOT: Name += "@GOT"; break;
221 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
222 case X86II::MO_PLT: Name += "@PLT"; break;
225 // Create a symbol for the name.
226 return Ctx.GetOrCreateSymbol(Name.str());
229 MCSymbol *X86MCInstLower::
230 GetBlockAddressSymbol(const MachineOperand &MO) const {
231 const char *Suffix = "";
232 switch (MO.getTargetFlags()) {
233 default: llvm_unreachable("Unknown target flag on BA operand");
234 case X86II::MO_NO_FLAG: break; // No flag.
235 case X86II::MO_PIC_BASE_OFFSET: break; // Doesn't modify symbol name.
236 case X86II::MO_GOTOFF: Suffix = "@GOTOFF"; break;
239 return AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress(), Suffix);
242 MCOperand X86MCInstLower::LowerSymbolOperand(const MachineOperand &MO,
243 MCSymbol *Sym) const {
244 // FIXME: We would like an efficient form for this, so we don't have to do a
245 // lot of extra uniquing.
246 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
248 switch (MO.getTargetFlags()) {
249 default: llvm_unreachable("Unknown target flag on GV operand");
250 case X86II::MO_NO_FLAG: // No flag.
252 // These affect the name of the symbol, not any suffix.
253 case X86II::MO_DARWIN_NONLAZY:
254 case X86II::MO_DLLIMPORT:
255 case X86II::MO_DARWIN_STUB:
256 case X86II::MO_TLSGD:
257 case X86II::MO_GOTTPOFF:
258 case X86II::MO_INDNTPOFF:
259 case X86II::MO_TPOFF:
260 case X86II::MO_NTPOFF:
261 case X86II::MO_GOTPCREL:
263 case X86II::MO_GOTOFF:
266 case X86II::MO_PIC_BASE_OFFSET:
267 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
268 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
269 // Subtract the pic base.
270 Expr = MCBinaryExpr::CreateSub(Expr,
271 MCSymbolRefExpr::Create(GetPICBaseSymbol(), Ctx),
276 if (!MO.isJTI() && MO.getOffset())
277 Expr = MCBinaryExpr::CreateAdd(Expr,
278 MCConstantExpr::Create(MO.getOffset(), Ctx),
280 return MCOperand::CreateExpr(Expr);
285 static void lower_subreg32(MCInst *MI, unsigned OpNo) {
286 // Convert registers in the addr mode according to subreg32.
287 unsigned Reg = MI->getOperand(OpNo).getReg();
289 MI->getOperand(OpNo).setReg(getX86SubSuperRegister(Reg, MVT::i32));
292 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
293 // Convert registers in the addr mode according to subreg64.
294 for (unsigned i = 0; i != 4; ++i) {
295 if (!MI->getOperand(OpNo+i).isReg()) continue;
297 unsigned Reg = MI->getOperand(OpNo+i).getReg();
298 if (Reg == 0) continue;
300 MI->getOperand(OpNo+i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
306 void X86MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
307 OutMI.setOpcode(MI->getOpcode());
309 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
310 const MachineOperand &MO = MI->getOperand(i);
313 switch (MO.getType()) {
316 llvm_unreachable("unknown operand type");
317 case MachineOperand::MO_Register:
318 // Ignore all implicit register operands.
319 if (MO.isImplicit()) continue;
320 MCOp = MCOperand::CreateReg(MO.getReg());
322 case MachineOperand::MO_Immediate:
323 MCOp = MCOperand::CreateImm(MO.getImm());
325 case MachineOperand::MO_MachineBasicBlock:
326 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
327 MO.getMBB()->getSymbol(Ctx), Ctx));
329 case MachineOperand::MO_GlobalAddress:
330 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
332 case MachineOperand::MO_ExternalSymbol:
333 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
335 case MachineOperand::MO_JumpTableIndex:
336 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
338 case MachineOperand::MO_ConstantPoolIndex:
339 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
341 case MachineOperand::MO_BlockAddress:
342 MCOp = LowerSymbolOperand(MO, GetBlockAddressSymbol(MO));
346 OutMI.addOperand(MCOp);
349 // Handle a few special cases to eliminate operand modifiers.
350 switch (OutMI.getOpcode()) {
351 case X86::LEA64_32r: // Handle 'subreg rewriting' for the lea64_32mem operand.
352 lower_lea64_32mem(&OutMI, 1);
354 case X86::MOVZX16rr8:
355 OutMI.setOpcode(X86::MOVZX32rr8);
356 lower_subreg32(&OutMI, 0);
358 case X86::MOVZX16rm8:
359 OutMI.setOpcode(X86::MOVZX32rm8);
360 lower_subreg32(&OutMI, 0);
362 case X86::MOVSX16rr8:
363 OutMI.setOpcode(X86::MOVSX32rr8);
364 lower_subreg32(&OutMI, 0);
366 case X86::MOVSX16rm8:
367 OutMI.setOpcode(X86::MOVSX32rm8);
368 lower_subreg32(&OutMI, 0);
370 case X86::MOVZX64rr32:
371 OutMI.setOpcode(X86::MOV32rr);
372 lower_subreg32(&OutMI, 0);
374 case X86::MOVZX64rm32:
375 OutMI.setOpcode(X86::MOV32rm);
376 lower_subreg32(&OutMI, 0);
378 case X86::MOV64ri64i32:
379 OutMI.setOpcode(X86::MOV32ri);
380 lower_subreg32(&OutMI, 0);
382 case X86::MOVZX64rr8:
383 OutMI.setOpcode(X86::MOVZX32rr8);
384 lower_subreg32(&OutMI, 0);
386 case X86::MOVZX64rm8:
387 OutMI.setOpcode(X86::MOVZX32rm8);
388 lower_subreg32(&OutMI, 0);
390 case X86::MOVZX64rr16:
391 OutMI.setOpcode(X86::MOVZX32rr16);
392 lower_subreg32(&OutMI, 0);
394 case X86::MOVZX64rm16:
395 OutMI.setOpcode(X86::MOVZX32rm16);
396 lower_subreg32(&OutMI, 0);
399 OutMI.setOpcode(X86::MOV32r0);
400 lower_subreg32(&OutMI, 0);
403 OutMI.setOpcode(X86::MOV32r0);
404 lower_subreg32(&OutMI, 0);
411 void X86AsmPrinter::EmitInstruction(const MachineInstr *MI) {
412 X86MCInstLower MCInstLowering(OutContext, Mang, *this);
413 switch (MI->getOpcode()) {
414 case TargetInstrInfo::DEBUG_VALUE: {
415 // FIXME: if this is implemented for another target before it goes
416 // away completely, the common part should be moved into AsmPrinter.
419 O << '\t' << MAI->getCommentString() << "DEBUG_VALUE: ";
420 unsigned NOps = MI->getNumOperands();
421 // cast away const; DIetc do not take const operands for some reason.
422 DIVariable V((MDNode*)(MI->getOperand(NOps-1).getMetadata()));
426 // Register or immediate value. Register 0 means undef.
427 assert(MI->getOperand(0).getType()==MachineOperand::MO_Register ||
428 MI->getOperand(0).getType()==MachineOperand::MO_Immediate ||
429 MI->getOperand(0).getType()==MachineOperand::MO_FPImmediate);
430 if (MI->getOperand(0).getType()==MachineOperand::MO_Register &&
431 MI->getOperand(0).getReg()==0) {
432 // Suppress offset in this case, it is not meaningful.
435 } else if (MI->getOperand(0).getType()==MachineOperand::MO_FPImmediate) {
436 // This is more naturally done in printOperand, but since the only use
437 // of such an operand is in this comment and that is temporary, we
438 // prefer to keep this localized.
440 MI->getOperand(0).print(O, &TM);
444 // Frame address. Currently handles register +- offset only.
445 assert(MI->getOperand(0).getType()==MachineOperand::MO_Register);
446 assert(MI->getOperand(3).getType()==MachineOperand::MO_Immediate);
447 O << '['; printOperand(MI, 0); O << '+'; printOperand(MI, 3); O << ']';
450 printOperand(MI, NOps-2);
453 case X86::MOVPC32r: {
455 // This is a pseudo op for a two instruction sequence with a label, which
462 MCSymbol *PICBase = MCInstLowering.GetPICBaseSymbol();
463 TmpInst.setOpcode(X86::CALLpcrel32);
464 // FIXME: We would like an efficient form for this, so we don't have to do a
465 // lot of extra uniquing.
466 TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
468 printMCInst(&TmpInst);
472 OutStreamer.EmitLabel(PICBase);
475 TmpInst.setOpcode(X86::POP32r);
476 TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
477 printMCInst(&TmpInst);
482 // Lower the MO_GOT_ABSOLUTE_ADDRESS form of ADD32ri.
483 if (MI->getOperand(2).getTargetFlags() != X86II::MO_GOT_ABSOLUTE_ADDRESS)
486 // Okay, we have something like:
487 // EAX = ADD32ri EAX, MO_GOT_ABSOLUTE_ADDRESS(@MYGLOBAL)
489 // For this, we want to print something like:
490 // MYGLOBAL + (. - PICBASE)
491 // However, we can't generate a ".", so just emit a new label here and refer
492 // to it. We know that this operand flag occurs at most once per function.
493 const char *Prefix = MAI->getPrivateGlobalPrefix();
494 MCSymbol *DotSym = OutContext.GetOrCreateSymbol(Twine(Prefix)+"picbaseref"+
495 Twine(getFunctionNumber()));
496 OutStreamer.EmitLabel(DotSym);
498 // Now that we have emitted the label, lower the complex operand expression.
499 MCSymbol *OpSym = MCInstLowering.GetExternalSymbolSymbol(MI->getOperand(2));
501 const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext);
502 const MCExpr *PICBase =
503 MCSymbolRefExpr::Create(MCInstLowering.GetPICBaseSymbol(), OutContext);
504 DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext);
506 DotExpr = MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(OpSym,OutContext),
507 DotExpr, OutContext);
510 TmpInst.setOpcode(X86::ADD32ri);
511 TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(0).getReg()));
512 TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(1).getReg()));
513 TmpInst.addOperand(MCOperand::CreateExpr(DotExpr));
514 printMCInst(&TmpInst);
520 MCInstLowering.Lower(MI, TmpInst);
523 printMCInst(&TmpInst);