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.
38 if (getSubtarget().isTargetDarwin()) {
39 raw_svector_ostream(Name) << 'L' << AsmPrinter.getFunctionNumber() << "$pb";
41 assert(getSubtarget().isTargetELF() && "Don't know how to print PIC label!");
42 raw_svector_ostream(Name) << ".Lllvm$" << AsmPrinter.getFunctionNumber()
45 return Ctx.GetOrCreateSymbol(Name.str());
48 MCSymbol *X86MCInstLower::GetMBBSymbol(unsigned MBBID) const {
50 raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "BB"
51 << AsmPrinter.getFunctionNumber() << '_' << MBBID;
53 return Ctx.GetOrCreateSymbol(Name.str());
58 /// LowerGlobalAddressOperand - Lower an MO_GlobalAddress operand to an
60 MCSymbol *X86MCInstLower::
61 GetGlobalAddressSymbol(const MachineOperand &MO) const {
62 const GlobalValue *GV = MO.getGlobal();
64 bool isImplicitlyPrivate = false;
65 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB ||
66 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
67 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
68 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
69 isImplicitlyPrivate = true;
71 SmallString<128> Name;
72 Mang->getNameWithPrefix(Name, GV, isImplicitlyPrivate);
74 if (getSubtarget().isTargetCygMing())
75 AsmPrinter.DecorateCygMingName(Name, GV);
77 switch (MO.getTargetFlags()) {
78 default: llvm_unreachable("Unknown target flag on GV operand");
79 case X86II::MO_NO_FLAG: // No flag.
80 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
82 case X86II::MO_DLLIMPORT: {
83 // Handle dllimport linkage.
84 const char *Prefix = "__imp_";
85 Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
88 case X86II::MO_DARWIN_NONLAZY:
89 case X86II::MO_DARWIN_NONLAZY_PIC_BASE: {
90 Name += "$non_lazy_ptr";
91 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
92 MCSymbol *&StubSym = AsmPrinter.GVStubs[Sym];
95 Mang->getNameWithPrefix(Name, GV, false);
96 StubSym = Ctx.GetOrCreateSymbol(Name.str());
100 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: {
101 Name += "$non_lazy_ptr";
102 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
103 MCSymbol *&StubSym = AsmPrinter.HiddenGVStubs[Sym];
106 Mang->getNameWithPrefix(Name, GV, false);
107 StubSym = Ctx.GetOrCreateSymbol(Name.str());
111 case X86II::MO_DARWIN_STUB: {
113 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
114 MCSymbol *&StubSym = AsmPrinter.FnStubs[Sym];
117 Mang->getNameWithPrefix(Name, GV, false);
118 StubSym = Ctx.GetOrCreateSymbol(Name.str());
122 // FIXME: These probably should be a modifier on the symbol or something??
123 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
124 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
125 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
126 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
127 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
128 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
129 case X86II::MO_GOT: Name += "@GOT"; break;
130 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
131 case X86II::MO_PLT: Name += "@PLT"; break;
134 return Ctx.GetOrCreateSymbol(Name.str());
137 MCSymbol *X86MCInstLower::
138 GetExternalSymbolSymbol(const MachineOperand &MO) const {
139 SmallString<128> Name;
140 Name += AsmPrinter.MAI->getGlobalPrefix();
141 Name += MO.getSymbolName();
143 switch (MO.getTargetFlags()) {
144 default: llvm_unreachable("Unknown target flag on GV operand");
145 case X86II::MO_NO_FLAG: // No flag.
146 case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name.
147 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
149 case X86II::MO_DLLIMPORT: {
150 // Handle dllimport linkage.
151 const char *Prefix = "__imp_";
152 Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
155 case X86II::MO_DARWIN_STUB: {
157 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
158 MCSymbol *&StubSym = AsmPrinter.FnStubs[Sym];
160 Name.erase(Name.end()-5, Name.end());
161 StubSym = Ctx.GetOrCreateSymbol(Name.str());
165 // FIXME: These probably should be a modifier on the symbol or something??
166 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
167 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
168 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
169 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
170 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
171 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
172 case X86II::MO_GOT: Name += "@GOT"; break;
173 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
174 case X86II::MO_PLT: Name += "@PLT"; break;
177 return Ctx.GetOrCreateSymbol(Name.str());
180 MCSymbol *X86MCInstLower::GetJumpTableSymbol(const MachineOperand &MO) const {
181 SmallString<256> Name;
182 raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "JTI"
183 << AsmPrinter.getFunctionNumber() << '_' << MO.getIndex();
185 switch (MO.getTargetFlags()) {
187 llvm_unreachable("Unknown target flag on GV operand");
188 case X86II::MO_NO_FLAG: // No flag.
189 case X86II::MO_PIC_BASE_OFFSET:
190 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
191 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
193 // FIXME: These probably should be a modifier on the symbol or something??
194 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
195 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
196 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
197 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
198 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
199 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
200 case X86II::MO_GOT: Name += "@GOT"; break;
201 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
202 case X86II::MO_PLT: Name += "@PLT"; break;
205 // Create a symbol for the name.
206 return Ctx.GetOrCreateSymbol(Name.str());
210 MCSymbol *X86MCInstLower::
211 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
212 SmallString<256> Name;
213 raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "CPI"
214 << AsmPrinter.getFunctionNumber() << '_' << MO.getIndex();
216 switch (MO.getTargetFlags()) {
218 llvm_unreachable("Unknown target flag on GV operand");
219 case X86II::MO_NO_FLAG: // No flag.
220 case X86II::MO_PIC_BASE_OFFSET:
221 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
222 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
224 // FIXME: These probably should be a modifier on the symbol or something??
225 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
226 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
227 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
228 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
229 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
230 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
231 case X86II::MO_GOT: Name += "@GOT"; break;
232 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
233 case X86II::MO_PLT: Name += "@PLT"; break;
236 // Create a symbol for the name.
237 return Ctx.GetOrCreateSymbol(Name.str());
240 MCOperand X86MCInstLower::LowerSymbolOperand(const MachineOperand &MO,
241 MCSymbol *Sym) const {
242 // FIXME: We would like an efficient form for this, so we don't have to do a
243 // lot of extra uniquing.
244 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
246 switch (MO.getTargetFlags()) {
247 default: llvm_unreachable("Unknown target flag on GV operand");
248 case X86II::MO_NO_FLAG: // No flag.
250 // These affect the name of the symbol, not any suffix.
251 case X86II::MO_DARWIN_NONLAZY:
252 case X86II::MO_DLLIMPORT:
253 case X86II::MO_DARWIN_STUB:
254 case X86II::MO_TLSGD:
255 case X86II::MO_GOTTPOFF:
256 case X86II::MO_INDNTPOFF:
257 case X86II::MO_TPOFF:
258 case X86II::MO_NTPOFF:
259 case X86II::MO_GOTPCREL:
261 case X86II::MO_GOTOFF:
264 case X86II::MO_PIC_BASE_OFFSET:
265 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
266 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
267 // Subtract the pic base.
268 Expr = MCBinaryExpr::CreateSub(Expr,
269 MCSymbolRefExpr::Create(GetPICBaseSymbol(), Ctx),
274 if (!MO.isJTI() && MO.getOffset())
275 Expr = MCBinaryExpr::CreateAdd(Expr,
276 MCConstantExpr::Create(MO.getOffset(), Ctx),
278 return MCOperand::CreateExpr(Expr);
283 static void lower_subreg32(MCInst *MI, unsigned OpNo) {
284 // Convert registers in the addr mode according to subreg32.
285 unsigned Reg = MI->getOperand(OpNo).getReg();
287 MI->getOperand(OpNo).setReg(getX86SubSuperRegister(Reg, MVT::i32));
290 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
291 // Convert registers in the addr mode according to subreg64.
292 for (unsigned i = 0; i != 4; ++i) {
293 if (!MI->getOperand(OpNo+i).isReg()) continue;
295 unsigned Reg = MI->getOperand(OpNo+i).getReg();
296 if (Reg == 0) continue;
298 MI->getOperand(OpNo+i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
304 void X86MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
305 OutMI.setOpcode(MI->getOpcode());
307 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
308 const MachineOperand &MO = MI->getOperand(i);
311 switch (MO.getType()) {
314 llvm_unreachable("unknown operand type");
315 case MachineOperand::MO_Register:
316 MCOp = MCOperand::CreateReg(MO.getReg());
318 case MachineOperand::MO_Immediate:
319 MCOp = MCOperand::CreateImm(MO.getImm());
321 case MachineOperand::MO_MachineBasicBlock:
322 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
323 GetMBBSymbol(MO.getMBB()->getNumber()), Ctx));
325 case MachineOperand::MO_GlobalAddress:
326 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
328 case MachineOperand::MO_ExternalSymbol:
329 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
331 case MachineOperand::MO_JumpTableIndex:
332 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
334 case MachineOperand::MO_ConstantPoolIndex:
335 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
339 OutMI.addOperand(MCOp);
342 // Handle a few special cases to eliminate operand modifiers.
343 switch (OutMI.getOpcode()) {
344 case X86::LEA64_32r: // Handle 'subreg rewriting' for the lea64_32mem operand.
345 lower_lea64_32mem(&OutMI, 1);
348 OutMI.setOpcode(X86::MOV32r0);
349 lower_subreg32(&OutMI, 0);
351 case X86::MOVZX16rr8:
352 OutMI.setOpcode(X86::MOVZX32rr8);
353 lower_subreg32(&OutMI, 0);
355 case X86::MOVZX16rm8:
356 OutMI.setOpcode(X86::MOVZX32rm8);
357 lower_subreg32(&OutMI, 0);
359 case X86::MOVSX16rr8:
360 OutMI.setOpcode(X86::MOVSX32rr8);
361 lower_subreg32(&OutMI, 0);
363 case X86::MOVSX16rm8:
364 OutMI.setOpcode(X86::MOVSX32rm8);
365 lower_subreg32(&OutMI, 0);
367 case X86::MOVZX64rr32:
368 OutMI.setOpcode(X86::MOV32rr);
369 lower_subreg32(&OutMI, 0);
371 case X86::MOVZX64rm32:
372 OutMI.setOpcode(X86::MOV32rm);
373 lower_subreg32(&OutMI, 0);
375 case X86::MOV64ri64i32:
376 OutMI.setOpcode(X86::MOV32ri);
377 lower_subreg32(&OutMI, 0);
379 case X86::MOVZX64rr8:
380 OutMI.setOpcode(X86::MOVZX32rr8);
381 lower_subreg32(&OutMI, 0);
383 case X86::MOVZX64rm8:
384 OutMI.setOpcode(X86::MOVZX32rm8);
385 lower_subreg32(&OutMI, 0);
387 case X86::MOVZX64rr16:
388 OutMI.setOpcode(X86::MOVZX32rr16);
389 lower_subreg32(&OutMI, 0);
391 case X86::MOVZX64rm16:
392 OutMI.setOpcode(X86::MOVZX32rm16);
393 lower_subreg32(&OutMI, 0);
400 void X86ATTAsmPrinter::
401 printInstructionThroughMCStreamer(const MachineInstr *MI) {
402 X86MCInstLower MCInstLowering(OutContext, Mang, *this);
403 switch (MI->getOpcode()) {
404 case TargetInstrInfo::DBG_LABEL:
405 case TargetInstrInfo::EH_LABEL:
406 case TargetInstrInfo::GC_LABEL:
409 case TargetInstrInfo::INLINEASM:
413 case TargetInstrInfo::IMPLICIT_DEF:
414 printImplicitDef(MI);
416 case X86::MOVPC32r: {
418 // This is a pseudo op for a two instruction sequence with a label, which
425 MCSymbol *PICBase = MCInstLowering.GetPICBaseSymbol();
426 TmpInst.setOpcode(X86::CALLpcrel32);
427 // FIXME: We would like an efficient form for this, so we don't have to do a
428 // lot of extra uniquing.
429 TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
431 printInstruction(&TmpInst);
435 OutStreamer.EmitLabel(PICBase);
438 TmpInst.setOpcode(X86::POP32r);
439 TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
440 printInstruction(&TmpInst);
445 // Lower the MO_GOT_ABSOLUTE_ADDRESS form of ADD32ri.
446 if (MI->getOperand(2).getTargetFlags() != X86II::MO_GOT_ABSOLUTE_ADDRESS)
449 // Okay, we have something like:
450 // EAX = ADD32ri EAX, MO_GOT_ABSOLUTE_ADDRESS(@MYGLOBAL)
452 // For this, we want to print something like:
453 // MYGLOBAL + (. - PICBASE)
454 // However, we can't generate a ".", so just emit a new label here and refer
455 // to it. We know that this operand flag occurs at most once per function.
456 SmallString<64> Name;
457 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix()
458 << "picbaseref" << getFunctionNumber();
459 MCSymbol *DotSym = OutContext.GetOrCreateSymbol(Name.str());
460 OutStreamer.EmitLabel(DotSym);
462 // Now that we have emitted the label, lower the complex operand expression.
463 MCSymbol *OpSym = MCInstLowering.GetExternalSymbolSymbol(MI->getOperand(2));
465 const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext);
466 const MCExpr *PICBase =
467 MCSymbolRefExpr::Create(MCInstLowering.GetPICBaseSymbol(), OutContext);
468 DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext);
470 DotExpr = MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(OpSym,OutContext),
471 DotExpr, OutContext);
474 TmpInst.setOpcode(X86::ADD32ri);
475 TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(0).getReg()));
476 TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(1).getReg()));
477 TmpInst.addOperand(MCOperand::CreateExpr(DotExpr));
478 printInstruction(&TmpInst);
484 MCInstLowering.Lower(MI, TmpInst);
487 printInstruction(&TmpInst);