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 "X86ATTAsmPrinter.h"
17 #include "X86MCAsmInfo.h"
18 #include "llvm/MC/MCContext.h"
19 #include "llvm/MC/MCExpr.h"
20 #include "llvm/MC/MCInst.h"
21 #include "llvm/MC/MCStreamer.h"
22 #include "llvm/Support/FormattedStream.h"
23 #include "llvm/Support/Mangler.h"
24 #include "llvm/ADT/SmallString.h"
28 const X86Subtarget &X86MCInstLower::getSubtarget() const {
29 return AsmPrinter.getSubtarget();
33 MCSymbol *X86MCInstLower::GetPICBaseSymbol() const {
34 // FIXME: the actual label generated doesn't matter here! Just mangle in
35 // something unique (the function number) with Private prefix.
37 raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix()
38 << AsmPrinter.getFunctionNumber() << "$pb";
39 return Ctx.GetOrCreateSymbol(Name.str());
43 /// LowerGlobalAddressOperand - Lower an MO_GlobalAddress operand to an
45 MCSymbol *X86MCInstLower::
46 GetGlobalAddressSymbol(const MachineOperand &MO) const {
47 const GlobalValue *GV = MO.getGlobal();
49 bool isImplicitlyPrivate = false;
50 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB ||
51 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
52 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
53 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
54 isImplicitlyPrivate = true;
56 SmallString<128> Name;
57 Mang->getNameWithPrefix(Name, GV, isImplicitlyPrivate);
59 if (getSubtarget().isTargetCygMing())
60 AsmPrinter.DecorateCygMingName(Name, GV);
62 switch (MO.getTargetFlags()) {
63 default: llvm_unreachable("Unknown target flag on GV operand");
64 case X86II::MO_NO_FLAG: // No flag.
65 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
67 case X86II::MO_DLLIMPORT: {
68 // Handle dllimport linkage.
69 const char *Prefix = "__imp_";
70 Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
73 case X86II::MO_DARWIN_NONLAZY:
74 case X86II::MO_DARWIN_NONLAZY_PIC_BASE: {
75 Name += "$non_lazy_ptr";
76 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
77 MCSymbol *&StubSym = AsmPrinter.GVStubs[Sym];
80 Mang->getNameWithPrefix(Name, GV, false);
81 StubSym = Ctx.GetOrCreateSymbol(Name.str());
85 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: {
86 Name += "$non_lazy_ptr";
87 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
88 MCSymbol *&StubSym = AsmPrinter.HiddenGVStubs[Sym];
91 Mang->getNameWithPrefix(Name, GV, false);
92 StubSym = Ctx.GetOrCreateSymbol(Name.str());
96 case X86II::MO_DARWIN_STUB: {
98 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
99 MCSymbol *&StubSym = AsmPrinter.FnStubs[Sym];
102 Mang->getNameWithPrefix(Name, GV, false);
103 StubSym = Ctx.GetOrCreateSymbol(Name.str());
107 // FIXME: These probably should be a modifier on the symbol or something??
108 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
109 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
110 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
111 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
112 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
113 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
114 case X86II::MO_GOT: Name += "@GOT"; break;
115 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
116 case X86II::MO_PLT: Name += "@PLT"; break;
119 return Ctx.GetOrCreateSymbol(Name.str());
122 MCSymbol *X86MCInstLower::
123 GetExternalSymbolSymbol(const MachineOperand &MO) const {
124 SmallString<128> Name;
125 Name += AsmPrinter.MAI->getGlobalPrefix();
126 Name += MO.getSymbolName();
128 switch (MO.getTargetFlags()) {
129 default: llvm_unreachable("Unknown target flag on GV operand");
130 case X86II::MO_NO_FLAG: // No flag.
131 case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name.
132 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
134 case X86II::MO_DLLIMPORT: {
135 // Handle dllimport linkage.
136 const char *Prefix = "__imp_";
137 Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
140 case X86II::MO_DARWIN_STUB: {
142 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
143 MCSymbol *&StubSym = AsmPrinter.FnStubs[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 raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "JTI"
168 << AsmPrinter.getFunctionNumber() << '_' << MO.getIndex();
170 switch (MO.getTargetFlags()) {
172 llvm_unreachable("Unknown target flag on GV operand");
173 case X86II::MO_NO_FLAG: // No flag.
174 case X86II::MO_PIC_BASE_OFFSET:
175 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
176 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
178 // FIXME: These probably should be a modifier on the symbol or something??
179 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
180 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
181 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
182 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
183 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
184 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
185 case X86II::MO_GOT: Name += "@GOT"; break;
186 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
187 case X86II::MO_PLT: Name += "@PLT"; break;
190 // Create a symbol for the name.
191 return Ctx.GetOrCreateSymbol(Name.str());
195 MCSymbol *X86MCInstLower::
196 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
197 SmallString<256> Name;
198 raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "CPI"
199 << AsmPrinter.getFunctionNumber() << '_' << MO.getIndex();
201 switch (MO.getTargetFlags()) {
203 llvm_unreachable("Unknown target flag on GV operand");
204 case X86II::MO_NO_FLAG: // No flag.
205 case X86II::MO_PIC_BASE_OFFSET:
206 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
207 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
209 // FIXME: These probably should be a modifier on the symbol or something??
210 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
211 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
212 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
213 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
214 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
215 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
216 case X86II::MO_GOT: Name += "@GOT"; break;
217 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
218 case X86II::MO_PLT: Name += "@PLT"; break;
221 // Create a symbol for the name.
222 return Ctx.GetOrCreateSymbol(Name.str());
225 MCOperand X86MCInstLower::LowerSymbolOperand(const MachineOperand &MO,
226 MCSymbol *Sym) const {
227 // FIXME: We would like an efficient form for this, so we don't have to do a
228 // lot of extra uniquing.
229 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
231 switch (MO.getTargetFlags()) {
232 default: llvm_unreachable("Unknown target flag on GV operand");
233 case X86II::MO_NO_FLAG: // No flag.
235 // These affect the name of the symbol, not any suffix.
236 case X86II::MO_DARWIN_NONLAZY:
237 case X86II::MO_DLLIMPORT:
238 case X86II::MO_DARWIN_STUB:
239 case X86II::MO_TLSGD:
240 case X86II::MO_GOTTPOFF:
241 case X86II::MO_INDNTPOFF:
242 case X86II::MO_TPOFF:
243 case X86II::MO_NTPOFF:
244 case X86II::MO_GOTPCREL:
246 case X86II::MO_GOTOFF:
249 case X86II::MO_PIC_BASE_OFFSET:
250 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
251 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
252 // Subtract the pic base.
253 Expr = MCBinaryExpr::CreateSub(Expr,
254 MCSymbolRefExpr::Create(GetPICBaseSymbol(), Ctx),
259 if (!MO.isJTI() && MO.getOffset())
260 Expr = MCBinaryExpr::CreateAdd(Expr,
261 MCConstantExpr::Create(MO.getOffset(), Ctx),
263 return MCOperand::CreateExpr(Expr);
268 static void lower_subreg32(MCInst *MI, unsigned OpNo) {
269 // Convert registers in the addr mode according to subreg32.
270 unsigned Reg = MI->getOperand(OpNo).getReg();
272 MI->getOperand(OpNo).setReg(getX86SubSuperRegister(Reg, MVT::i32));
275 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
276 // Convert registers in the addr mode according to subreg64.
277 for (unsigned i = 0; i != 4; ++i) {
278 if (!MI->getOperand(OpNo+i).isReg()) continue;
280 unsigned Reg = MI->getOperand(OpNo+i).getReg();
281 if (Reg == 0) continue;
283 MI->getOperand(OpNo+i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
289 void X86MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
290 OutMI.setOpcode(MI->getOpcode());
292 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
293 const MachineOperand &MO = MI->getOperand(i);
296 switch (MO.getType()) {
299 llvm_unreachable("unknown operand type");
300 case MachineOperand::MO_Register:
301 MCOp = MCOperand::CreateReg(MO.getReg());
303 case MachineOperand::MO_Immediate:
304 MCOp = MCOperand::CreateImm(MO.getImm());
306 case MachineOperand::MO_MachineBasicBlock:
307 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
308 AsmPrinter.GetMBBSymbol(MO.getMBB()->getNumber()), Ctx));
310 case MachineOperand::MO_GlobalAddress:
311 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
313 case MachineOperand::MO_ExternalSymbol:
314 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
316 case MachineOperand::MO_JumpTableIndex:
317 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
319 case MachineOperand::MO_ConstantPoolIndex:
320 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
324 OutMI.addOperand(MCOp);
327 // Handle a few special cases to eliminate operand modifiers.
328 switch (OutMI.getOpcode()) {
329 case X86::LEA64_32r: // Handle 'subreg rewriting' for the lea64_32mem operand.
330 lower_lea64_32mem(&OutMI, 1);
333 OutMI.setOpcode(X86::MOV32r0);
334 lower_subreg32(&OutMI, 0);
336 case X86::MOVZX16rr8:
337 OutMI.setOpcode(X86::MOVZX32rr8);
338 lower_subreg32(&OutMI, 0);
340 case X86::MOVZX16rm8:
341 OutMI.setOpcode(X86::MOVZX32rm8);
342 lower_subreg32(&OutMI, 0);
344 case X86::MOVSX16rr8:
345 OutMI.setOpcode(X86::MOVSX32rr8);
346 lower_subreg32(&OutMI, 0);
348 case X86::MOVSX16rm8:
349 OutMI.setOpcode(X86::MOVSX32rm8);
350 lower_subreg32(&OutMI, 0);
352 case X86::MOVZX64rr32:
353 OutMI.setOpcode(X86::MOV32rr);
354 lower_subreg32(&OutMI, 0);
356 case X86::MOVZX64rm32:
357 OutMI.setOpcode(X86::MOV32rm);
358 lower_subreg32(&OutMI, 0);
360 case X86::MOV64ri64i32:
361 OutMI.setOpcode(X86::MOV32ri);
362 lower_subreg32(&OutMI, 0);
364 case X86::MOVZX64rr8:
365 OutMI.setOpcode(X86::MOVZX32rr8);
366 lower_subreg32(&OutMI, 0);
368 case X86::MOVZX64rm8:
369 OutMI.setOpcode(X86::MOVZX32rm8);
370 lower_subreg32(&OutMI, 0);
372 case X86::MOVZX64rr16:
373 OutMI.setOpcode(X86::MOVZX32rr16);
374 lower_subreg32(&OutMI, 0);
376 case X86::MOVZX64rm16:
377 OutMI.setOpcode(X86::MOVZX32rm16);
378 lower_subreg32(&OutMI, 0);
385 void X86ATTAsmPrinter::
386 printInstructionThroughMCStreamer(const MachineInstr *MI) {
387 X86MCInstLower MCInstLowering(OutContext, Mang, *this);
388 switch (MI->getOpcode()) {
389 case TargetInstrInfo::DBG_LABEL:
390 case TargetInstrInfo::EH_LABEL:
391 case TargetInstrInfo::GC_LABEL:
394 case TargetInstrInfo::INLINEASM:
398 case TargetInstrInfo::IMPLICIT_DEF:
399 printImplicitDef(MI);
401 case X86::MOVPC32r: {
403 // This is a pseudo op for a two instruction sequence with a label, which
410 MCSymbol *PICBase = MCInstLowering.GetPICBaseSymbol();
411 TmpInst.setOpcode(X86::CALLpcrel32);
412 // FIXME: We would like an efficient form for this, so we don't have to do a
413 // lot of extra uniquing.
414 TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
416 printInstruction(&TmpInst);
420 OutStreamer.EmitLabel(PICBase);
423 TmpInst.setOpcode(X86::POP32r);
424 TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
425 printInstruction(&TmpInst);
430 // Lower the MO_GOT_ABSOLUTE_ADDRESS form of ADD32ri.
431 if (MI->getOperand(2).getTargetFlags() != X86II::MO_GOT_ABSOLUTE_ADDRESS)
434 // Okay, we have something like:
435 // EAX = ADD32ri EAX, MO_GOT_ABSOLUTE_ADDRESS(@MYGLOBAL)
437 // For this, we want to print something like:
438 // MYGLOBAL + (. - PICBASE)
439 // However, we can't generate a ".", so just emit a new label here and refer
440 // to it. We know that this operand flag occurs at most once per function.
441 SmallString<64> Name;
442 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix()
443 << "picbaseref" << getFunctionNumber();
444 MCSymbol *DotSym = OutContext.GetOrCreateSymbol(Name.str());
445 OutStreamer.EmitLabel(DotSym);
447 // Now that we have emitted the label, lower the complex operand expression.
448 MCSymbol *OpSym = MCInstLowering.GetExternalSymbolSymbol(MI->getOperand(2));
450 const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext);
451 const MCExpr *PICBase =
452 MCSymbolRefExpr::Create(MCInstLowering.GetPICBaseSymbol(), OutContext);
453 DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext);
455 DotExpr = MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(OpSym,OutContext),
456 DotExpr, OutContext);
459 TmpInst.setOpcode(X86::ADD32ri);
460 TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(0).getReg()));
461 TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(1).getReg()));
462 TmpInst.addOperand(MCOperand::CreateExpr(DotExpr));
463 printInstruction(&TmpInst);
469 MCInstLowering.Lower(MI, TmpInst);
472 printInstruction(&TmpInst);