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/Target/Mangler.h"
25 #include "llvm/Support/FormattedStream.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())+"$pb");
45 /// LowerGlobalAddressOperand - Lower an MO_GlobalAddress operand to an
47 MCSymbol *X86MCInstLower::
48 GetGlobalAddressSymbol(const MachineOperand &MO) const {
49 const GlobalValue *GV = MO.getGlobal();
51 bool isImplicitlyPrivate = false;
52 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB ||
53 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
54 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
55 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
56 isImplicitlyPrivate = true;
58 SmallString<128> Name;
59 Mang->getNameWithPrefix(Name, GV, isImplicitlyPrivate);
61 if (getSubtarget().isTargetCygMing()) {
62 X86COFFMachineModuleInfo &COFFMMI =
63 AsmPrinter.MMI->getObjFileInfo<X86COFFMachineModuleInfo>();
64 COFFMMI.DecorateCygMingName(Name, GV, *AsmPrinter.TM.getTargetData());
67 switch (MO.getTargetFlags()) {
68 default: llvm_unreachable("Unknown target flag on GV operand");
69 case X86II::MO_NO_FLAG: // No flag.
70 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
72 case X86II::MO_DLLIMPORT: {
73 // Handle dllimport linkage.
74 const char *Prefix = "__imp_";
75 Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
78 case X86II::MO_DARWIN_NONLAZY:
79 case X86II::MO_DARWIN_NONLAZY_PIC_BASE: {
80 Name += "$non_lazy_ptr";
81 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
83 const MCSymbol *&StubSym = getMachOMMI().getGVStubEntry(Sym);
85 StubSym = AsmPrinter.GetGlobalValueSymbol(GV);
88 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: {
89 Name += "$non_lazy_ptr";
90 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
91 const MCSymbol *&StubSym = getMachOMMI().getHiddenGVStubEntry(Sym);
93 StubSym = AsmPrinter.GetGlobalValueSymbol(GV);
96 case X86II::MO_DARWIN_STUB: {
98 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
99 const MCSymbol *&StubSym = getMachOMMI().getFnStubEntry(Sym);
101 StubSym = AsmPrinter.GetGlobalValueSymbol(GV);
104 // FIXME: These probably should be a modifier on the symbol or something??
105 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
106 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
107 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
108 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
109 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
110 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
111 case X86II::MO_GOT: Name += "@GOT"; break;
112 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
113 case X86II::MO_PLT: Name += "@PLT"; break;
116 return Ctx.GetOrCreateSymbol(Name.str());
119 MCSymbol *X86MCInstLower::
120 GetExternalSymbolSymbol(const MachineOperand &MO) const {
121 SmallString<128> Name;
122 Name += AsmPrinter.MAI->getGlobalPrefix();
123 Name += MO.getSymbolName();
125 switch (MO.getTargetFlags()) {
126 default: llvm_unreachable("Unknown target flag on GV operand");
127 case X86II::MO_NO_FLAG: // No flag.
128 case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name.
129 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
131 case X86II::MO_DLLIMPORT: {
132 // Handle dllimport linkage.
133 const char *Prefix = "__imp_";
134 Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
137 case X86II::MO_DARWIN_STUB: {
139 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
140 const MCSymbol *&StubSym = getMachOMMI().getFnStubEntry(Sym);
143 Name.erase(Name.end()-5, Name.end());
144 StubSym = Ctx.GetOrCreateSymbol(Name.str());
148 // FIXME: These probably should be a modifier on the symbol or something??
149 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
150 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
151 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
152 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
153 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
154 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
155 case X86II::MO_GOT: Name += "@GOT"; break;
156 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
157 case X86II::MO_PLT: Name += "@PLT"; break;
160 return Ctx.GetOrCreateSymbol(Name.str());
163 MCSymbol *X86MCInstLower::GetJumpTableSymbol(const MachineOperand &MO) const {
164 SmallString<256> Name;
165 raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "JTI"
166 << AsmPrinter.getFunctionNumber() << '_' << MO.getIndex();
168 switch (MO.getTargetFlags()) {
170 llvm_unreachable("Unknown target flag on GV operand");
171 case X86II::MO_NO_FLAG: // No flag.
172 case X86II::MO_PIC_BASE_OFFSET:
173 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
174 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
176 // FIXME: These probably should be a modifier on the symbol or something??
177 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
178 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
179 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
180 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
181 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
182 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
183 case X86II::MO_GOT: Name += "@GOT"; break;
184 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
185 case X86II::MO_PLT: Name += "@PLT"; break;
188 // Create a symbol for the name.
189 return Ctx.GetOrCreateSymbol(Name.str());
193 MCSymbol *X86MCInstLower::
194 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
195 SmallString<256> Name;
196 raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "CPI"
197 << AsmPrinter.getFunctionNumber() << '_' << MO.getIndex();
199 switch (MO.getTargetFlags()) {
201 llvm_unreachable("Unknown target flag on GV operand");
202 case X86II::MO_NO_FLAG: // No flag.
203 case X86II::MO_PIC_BASE_OFFSET:
204 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
205 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
207 // FIXME: These probably should be a modifier on the symbol or something??
208 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
209 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
210 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
211 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
212 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
213 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
214 case X86II::MO_GOT: Name += "@GOT"; break;
215 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
216 case X86II::MO_PLT: Name += "@PLT"; break;
219 // Create a symbol for the name.
220 return Ctx.GetOrCreateSymbol(Name.str());
223 MCSymbol *X86MCInstLower::
224 GetBlockAddressSymbol(const MachineOperand &MO) const {
225 const char *Suffix = "";
226 switch (MO.getTargetFlags()) {
227 default: llvm_unreachable("Unknown target flag on BA operand");
228 case X86II::MO_NO_FLAG: break; // No flag.
229 case X86II::MO_PIC_BASE_OFFSET: break; // Doesn't modify symbol name.
230 case X86II::MO_GOTOFF: Suffix = "@GOTOFF"; break;
233 return AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress(), Suffix);
236 MCOperand X86MCInstLower::LowerSymbolOperand(const MachineOperand &MO,
237 MCSymbol *Sym) const {
238 // FIXME: We would like an efficient form for this, so we don't have to do a
239 // lot of extra uniquing.
240 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
242 switch (MO.getTargetFlags()) {
243 default: llvm_unreachable("Unknown target flag on GV operand");
244 case X86II::MO_NO_FLAG: // No flag.
246 // These affect the name of the symbol, not any suffix.
247 case X86II::MO_DARWIN_NONLAZY:
248 case X86II::MO_DLLIMPORT:
249 case X86II::MO_DARWIN_STUB:
250 case X86II::MO_TLSGD:
251 case X86II::MO_GOTTPOFF:
252 case X86II::MO_INDNTPOFF:
253 case X86II::MO_TPOFF:
254 case X86II::MO_NTPOFF:
255 case X86II::MO_GOTPCREL:
257 case X86II::MO_GOTOFF:
260 case X86II::MO_PIC_BASE_OFFSET:
261 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
262 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
263 // Subtract the pic base.
264 Expr = MCBinaryExpr::CreateSub(Expr,
265 MCSymbolRefExpr::Create(GetPICBaseSymbol(), Ctx),
270 if (!MO.isJTI() && MO.getOffset())
271 Expr = MCBinaryExpr::CreateAdd(Expr,
272 MCConstantExpr::Create(MO.getOffset(), Ctx),
274 return MCOperand::CreateExpr(Expr);
279 static void lower_subreg32(MCInst *MI, unsigned OpNo) {
280 // Convert registers in the addr mode according to subreg32.
281 unsigned Reg = MI->getOperand(OpNo).getReg();
283 MI->getOperand(OpNo).setReg(getX86SubSuperRegister(Reg, MVT::i32));
286 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
287 // Convert registers in the addr mode according to subreg64.
288 for (unsigned i = 0; i != 4; ++i) {
289 if (!MI->getOperand(OpNo+i).isReg()) continue;
291 unsigned Reg = MI->getOperand(OpNo+i).getReg();
292 if (Reg == 0) continue;
294 MI->getOperand(OpNo+i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
300 void X86MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
301 OutMI.setOpcode(MI->getOpcode());
303 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
304 const MachineOperand &MO = MI->getOperand(i);
307 switch (MO.getType()) {
310 llvm_unreachable("unknown operand type");
311 case MachineOperand::MO_Register:
312 // Ignore all implicit register operands.
313 if (MO.isImplicit()) continue;
314 MCOp = MCOperand::CreateReg(MO.getReg());
316 case MachineOperand::MO_Immediate:
317 MCOp = MCOperand::CreateImm(MO.getImm());
319 case MachineOperand::MO_MachineBasicBlock:
320 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
321 AsmPrinter.GetMBBSymbol(MO.getMBB()->getNumber()), Ctx));
323 case MachineOperand::MO_GlobalAddress:
324 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
326 case MachineOperand::MO_ExternalSymbol:
327 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
329 case MachineOperand::MO_JumpTableIndex:
330 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
332 case MachineOperand::MO_ConstantPoolIndex:
333 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
335 case MachineOperand::MO_BlockAddress:
336 MCOp = LowerSymbolOperand(MO, GetBlockAddressSymbol(MO));
340 OutMI.addOperand(MCOp);
343 // Handle a few special cases to eliminate operand modifiers.
344 switch (OutMI.getOpcode()) {
345 case X86::LEA64_32r: // Handle 'subreg rewriting' for the lea64_32mem operand.
346 lower_lea64_32mem(&OutMI, 1);
348 case X86::MOVZX16rr8:
349 OutMI.setOpcode(X86::MOVZX32rr8);
350 lower_subreg32(&OutMI, 0);
352 case X86::MOVZX16rm8:
353 OutMI.setOpcode(X86::MOVZX32rm8);
354 lower_subreg32(&OutMI, 0);
356 case X86::MOVSX16rr8:
357 OutMI.setOpcode(X86::MOVSX32rr8);
358 lower_subreg32(&OutMI, 0);
360 case X86::MOVSX16rm8:
361 OutMI.setOpcode(X86::MOVSX32rm8);
362 lower_subreg32(&OutMI, 0);
364 case X86::MOVZX64rr32:
365 OutMI.setOpcode(X86::MOV32rr);
366 lower_subreg32(&OutMI, 0);
368 case X86::MOVZX64rm32:
369 OutMI.setOpcode(X86::MOV32rm);
370 lower_subreg32(&OutMI, 0);
372 case X86::MOV64ri64i32:
373 OutMI.setOpcode(X86::MOV32ri);
374 lower_subreg32(&OutMI, 0);
376 case X86::MOVZX64rr8:
377 OutMI.setOpcode(X86::MOVZX32rr8);
378 lower_subreg32(&OutMI, 0);
380 case X86::MOVZX64rm8:
381 OutMI.setOpcode(X86::MOVZX32rm8);
382 lower_subreg32(&OutMI, 0);
384 case X86::MOVZX64rr16:
385 OutMI.setOpcode(X86::MOVZX32rr16);
386 lower_subreg32(&OutMI, 0);
388 case X86::MOVZX64rm16:
389 OutMI.setOpcode(X86::MOVZX32rm16);
390 lower_subreg32(&OutMI, 0);
393 OutMI.setOpcode(X86::MOV32r0);
394 lower_subreg32(&OutMI, 0);
397 OutMI.setOpcode(X86::MOV32r0);
398 lower_subreg32(&OutMI, 0);
405 void X86AsmPrinter::printInstructionThroughMCStreamer(const MachineInstr *MI) {
406 X86MCInstLower MCInstLowering(OutContext, Mang, *this);
407 switch (MI->getOpcode()) {
408 case TargetInstrInfo::DBG_LABEL:
409 case TargetInstrInfo::EH_LABEL:
410 case TargetInstrInfo::GC_LABEL:
413 case TargetInstrInfo::DEBUG_VALUE: {
414 // FIXME: if this is implemented for another target before it goes
415 // away completely, the common part should be moved into AsmPrinter.
418 O << '\t' << MAI->getCommentString() << "DEBUG_VALUE: ";
419 unsigned NOps = MI->getNumOperands();
420 // cast away const; DIetc do not take const operands for some reason.
421 DIVariable V((MDNode*)(MI->getOperand(NOps-1).getMetadata()));
425 // Variable is in register
426 assert(MI->getOperand(0).getType()==MachineOperand::MO_Register);
429 // Frame address. Currently handles register +- offset only.
430 assert(MI->getOperand(0).getType()==MachineOperand::MO_Register);
431 assert(MI->getOperand(3).getType()==MachineOperand::MO_Immediate);
432 O << '['; printOperand(MI, 0); O << '+'; printOperand(MI, 3); O << ']';
435 printOperand(MI, NOps-2);
438 case TargetInstrInfo::INLINEASM:
441 case TargetInstrInfo::IMPLICIT_DEF:
442 printImplicitDef(MI);
444 case TargetInstrInfo::KILL:
447 case X86::MOVPC32r: {
449 // This is a pseudo op for a two instruction sequence with a label, which
456 MCSymbol *PICBase = MCInstLowering.GetPICBaseSymbol();
457 TmpInst.setOpcode(X86::CALLpcrel32);
458 // FIXME: We would like an efficient form for this, so we don't have to do a
459 // lot of extra uniquing.
460 TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
462 printMCInst(&TmpInst);
466 OutStreamer.EmitLabel(PICBase);
469 TmpInst.setOpcode(X86::POP32r);
470 TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
471 printMCInst(&TmpInst);
476 // Lower the MO_GOT_ABSOLUTE_ADDRESS form of ADD32ri.
477 if (MI->getOperand(2).getTargetFlags() != X86II::MO_GOT_ABSOLUTE_ADDRESS)
480 // Okay, we have something like:
481 // EAX = ADD32ri EAX, MO_GOT_ABSOLUTE_ADDRESS(@MYGLOBAL)
483 // For this, we want to print something like:
484 // MYGLOBAL + (. - PICBASE)
485 // However, we can't generate a ".", so just emit a new label here and refer
486 // to it. We know that this operand flag occurs at most once per function.
487 const char *Prefix = MAI->getPrivateGlobalPrefix();
488 MCSymbol *DotSym = OutContext.GetOrCreateSymbol(Twine(Prefix)+"picbaseref"+
489 Twine(getFunctionNumber()));
490 OutStreamer.EmitLabel(DotSym);
492 // Now that we have emitted the label, lower the complex operand expression.
493 MCSymbol *OpSym = MCInstLowering.GetExternalSymbolSymbol(MI->getOperand(2));
495 const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext);
496 const MCExpr *PICBase =
497 MCSymbolRefExpr::Create(MCInstLowering.GetPICBaseSymbol(), OutContext);
498 DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext);
500 DotExpr = MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(OpSym,OutContext),
501 DotExpr, OutContext);
504 TmpInst.setOpcode(X86::ADD32ri);
505 TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(0).getReg()));
506 TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(1).getReg()));
507 TmpInst.addOperand(MCOperand::CreateExpr(DotExpr));
508 printMCInst(&TmpInst);
514 MCInstLowering.Lower(MI, TmpInst);
517 printMCInst(&TmpInst);