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 MCOperand X86MCInstLower::LowerMBBOperand(const MachineOperand &MO) const {
50 raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "BB"
51 << AsmPrinter.getFunctionNumber() << '_' << MO.getMBB()->getNumber();
53 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
54 return MCOperand::CreateExpr(MCSymbolRefExpr::Create(Sym, Ctx));
59 /// LowerGlobalAddressOperand - Lower an MO_GlobalAddress operand to an
61 MCSymbol *X86MCInstLower::
62 GetGlobalAddressSymbol(const MachineOperand &MO) const {
63 const GlobalValue *GV = MO.getGlobal();
65 bool isImplicitlyPrivate = false;
66 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB ||
67 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
68 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
69 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
70 isImplicitlyPrivate = true;
72 SmallString<128> Name;
73 Mang->getNameWithPrefix(Name, GV, isImplicitlyPrivate);
75 if (getSubtarget().isTargetCygMing())
76 AsmPrinter.DecorateCygMingName(Name, GV);
78 switch (MO.getTargetFlags()) {
79 default: llvm_unreachable("Unknown target flag on GV operand");
80 case X86II::MO_NO_FLAG: // No flag.
81 case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name.
82 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
84 case X86II::MO_DLLIMPORT: {
85 // Handle dllimport linkage.
86 const char *Prefix = "__imp_";
87 Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
90 case X86II::MO_DARWIN_NONLAZY:
91 case X86II::MO_DARWIN_NONLAZY_PIC_BASE: {
92 Name += "$non_lazy_ptr";
93 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
94 MCSymbol *&StubSym = AsmPrinter.GVStubs[Sym];
97 Mang->getNameWithPrefix(Name, GV, false);
98 StubSym = Ctx.GetOrCreateSymbol(Name.str());
102 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: {
103 Name += "$non_lazy_ptr";
104 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
105 MCSymbol *&StubSym = AsmPrinter.HiddenGVStubs[Sym];
108 Mang->getNameWithPrefix(Name, GV, false);
109 StubSym = Ctx.GetOrCreateSymbol(Name.str());
113 case X86II::MO_DARWIN_STUB: {
115 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
116 MCSymbol *&StubSym = AsmPrinter.FnStubs[Sym];
119 Mang->getNameWithPrefix(Name, GV, false);
120 StubSym = Ctx.GetOrCreateSymbol(Name.str());
124 // FIXME: These probably should be a modifier on the symbol or something??
125 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
126 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
127 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
128 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
129 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
130 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
131 case X86II::MO_GOT: Name += "@GOT"; break;
132 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
133 case X86II::MO_PLT: Name += "@PLT"; break;
136 return Ctx.GetOrCreateSymbol(Name.str());
139 MCSymbol *X86MCInstLower::
140 GetExternalSymbolSymbol(const MachineOperand &MO) const {
141 SmallString<128> Name;
142 Name += AsmPrinter.MAI->getGlobalPrefix();
143 Name += MO.getSymbolName();
145 switch (MO.getTargetFlags()) {
146 default: llvm_unreachable("Unknown target flag on GV operand");
147 case X86II::MO_NO_FLAG: // No flag.
148 case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name.
149 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
151 case X86II::MO_DLLIMPORT: {
152 // Handle dllimport linkage.
153 const char *Prefix = "__imp_";
154 Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
157 case X86II::MO_DARWIN_STUB: {
159 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
160 MCSymbol *&StubSym = AsmPrinter.FnStubs[Sym];
162 Name.erase(Name.end()-5, Name.end());
163 StubSym = Ctx.GetOrCreateSymbol(Name.str());
167 // FIXME: These probably should be a modifier on the symbol or something??
168 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
169 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
170 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
171 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
172 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
173 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
174 case X86II::MO_GOT: Name += "@GOT"; break;
175 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
176 case X86II::MO_PLT: Name += "@PLT"; break;
179 return Ctx.GetOrCreateSymbol(Name.str());
182 MCSymbol *X86MCInstLower::GetJumpTableSymbol(const MachineOperand &MO) const {
183 SmallString<256> Name;
184 raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "JTI"
185 << AsmPrinter.getFunctionNumber() << '_' << MO.getIndex();
187 switch (MO.getTargetFlags()) {
189 llvm_unreachable("Unknown target flag on GV operand");
190 case X86II::MO_NO_FLAG: // No flag.
191 case X86II::MO_PIC_BASE_OFFSET:
192 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
193 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
195 // FIXME: These probably should be a modifier on the symbol or something??
196 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
197 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
198 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
199 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
200 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
201 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
202 case X86II::MO_GOT: Name += "@GOT"; break;
203 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
204 case X86II::MO_PLT: Name += "@PLT"; break;
207 // Create a symbol for the name.
208 return Ctx.GetOrCreateSymbol(Name.str());
212 MCSymbol *X86MCInstLower::
213 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
214 SmallString<256> Name;
215 raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "CPI"
216 << AsmPrinter.getFunctionNumber() << '_' << MO.getIndex();
218 switch (MO.getTargetFlags()) {
220 llvm_unreachable("Unknown target flag on GV operand");
221 case X86II::MO_NO_FLAG: // No flag.
222 case X86II::MO_PIC_BASE_OFFSET:
223 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
224 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
226 // FIXME: These probably should be a modifier on the symbol or something??
227 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
228 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
229 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
230 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
231 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
232 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
233 case X86II::MO_GOT: Name += "@GOT"; break;
234 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
235 case X86II::MO_PLT: Name += "@PLT"; break;
238 // Create a symbol for the name.
239 return Ctx.GetOrCreateSymbol(Name.str());
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(),
275 case X86II::MO_GOT_ABSOLUTE_ADDRESS: {
276 // For this, we want to print something like:
277 // MYSYMBOL + (. - PICBASE)
278 // However, we can't generate a ".", so just emit a new label here and refer
279 // to it. We know that this operand flag occurs at most once per function.
280 SmallString<64> Name;
281 raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix()
282 << "picbaseref" << AsmPrinter.getFunctionNumber();
283 MCSymbol *DotSym = Ctx.GetOrCreateSymbol(Name.str());
284 // FIXME: This instruction should be lowered before we get here...
285 AsmPrinter.OutStreamer.EmitLabel(DotSym);
287 const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, Ctx);
288 const MCExpr *PICBase = MCSymbolRefExpr::Create(GetPICBaseSymbol(),
290 DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, Ctx);
291 Expr = MCBinaryExpr::CreateAdd(Expr, DotExpr, Ctx);
296 if (!MO.isJTI() && MO.getOffset())
297 Expr = MCBinaryExpr::CreateAdd(Expr,
298 MCConstantExpr::Create(MO.getOffset(), Ctx),
300 return MCOperand::CreateExpr(Expr);
305 static void lower_subreg32(MCInst *MI, unsigned OpNo) {
306 // Convert registers in the addr mode according to subreg32.
307 unsigned Reg = MI->getOperand(OpNo).getReg();
309 MI->getOperand(OpNo).setReg(getX86SubSuperRegister(Reg, MVT::i32));
312 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
313 // Convert registers in the addr mode according to subreg64.
314 for (unsigned i = 0; i != 4; ++i) {
315 if (!MI->getOperand(OpNo+i).isReg()) continue;
317 unsigned Reg = MI->getOperand(OpNo+i).getReg();
318 if (Reg == 0) continue;
320 MI->getOperand(OpNo+i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
326 void X86MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
327 OutMI.setOpcode(MI->getOpcode());
329 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
330 const MachineOperand &MO = MI->getOperand(i);
333 switch (MO.getType()) {
336 llvm_unreachable("unknown operand type");
337 case MachineOperand::MO_Register:
338 MCOp = MCOperand::CreateReg(MO.getReg());
340 case MachineOperand::MO_Immediate:
341 MCOp = MCOperand::CreateImm(MO.getImm());
343 case MachineOperand::MO_MachineBasicBlock:
344 MCOp = LowerMBBOperand(MO);
346 case MachineOperand::MO_GlobalAddress:
347 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
349 case MachineOperand::MO_ExternalSymbol:
350 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
352 case MachineOperand::MO_JumpTableIndex:
353 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
355 case MachineOperand::MO_ConstantPoolIndex:
356 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
360 OutMI.addOperand(MCOp);
363 // Handle a few special cases to eliminate operand modifiers.
364 switch (OutMI.getOpcode()) {
365 case X86::LEA64_32r: // Handle 'subreg rewriting' for the lea64_32mem operand.
366 lower_lea64_32mem(&OutMI, 1);
369 OutMI.setOpcode(X86::MOV32r0);
370 lower_subreg32(&OutMI, 0);
372 case X86::MOVZX16rr8:
373 OutMI.setOpcode(X86::MOVZX32rr8);
374 lower_subreg32(&OutMI, 0);
376 case X86::MOVZX16rm8:
377 OutMI.setOpcode(X86::MOVZX32rm8);
378 lower_subreg32(&OutMI, 0);
380 case X86::MOVSX16rr8:
381 OutMI.setOpcode(X86::MOVSX32rr8);
382 lower_subreg32(&OutMI, 0);
384 case X86::MOVSX16rm8:
385 OutMI.setOpcode(X86::MOVSX32rm8);
386 lower_subreg32(&OutMI, 0);
388 case X86::MOVZX64rr32:
389 OutMI.setOpcode(X86::MOV32rr);
390 lower_subreg32(&OutMI, 0);
392 case X86::MOVZX64rm32:
393 OutMI.setOpcode(X86::MOV32rm);
394 lower_subreg32(&OutMI, 0);
396 case X86::MOV64ri64i32:
397 OutMI.setOpcode(X86::MOV32ri);
398 lower_subreg32(&OutMI, 0);
400 case X86::MOVZX64rr8:
401 OutMI.setOpcode(X86::MOVZX32rr8);
402 lower_subreg32(&OutMI, 0);
404 case X86::MOVZX64rm8:
405 OutMI.setOpcode(X86::MOVZX32rm8);
406 lower_subreg32(&OutMI, 0);
408 case X86::MOVZX64rr16:
409 OutMI.setOpcode(X86::MOVZX32rr16);
410 lower_subreg32(&OutMI, 0);
412 case X86::MOVZX64rm16:
413 OutMI.setOpcode(X86::MOVZX32rm16);
414 lower_subreg32(&OutMI, 0);
421 void X86ATTAsmPrinter::
422 printInstructionThroughMCStreamer(const MachineInstr *MI) {
423 X86MCInstLower MCInstLowering(OutContext, Mang, *this);
424 switch (MI->getOpcode()) {
425 case TargetInstrInfo::DBG_LABEL:
426 case TargetInstrInfo::EH_LABEL:
427 case TargetInstrInfo::GC_LABEL:
430 case TargetInstrInfo::INLINEASM:
434 case TargetInstrInfo::IMPLICIT_DEF:
435 printImplicitDef(MI);
437 case X86::MOVPC32r: {
439 // This is a pseudo op for a two instruction sequence with a label, which
446 MCSymbol *PICBase = MCInstLowering.GetPICBaseSymbol();
447 TmpInst.setOpcode(X86::CALLpcrel32);
448 // FIXME: We would like an efficient form for this, so we don't have to do a
449 // lot of extra uniquing.
450 TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
452 printInstruction(&TmpInst);
456 OutStreamer.EmitLabel(PICBase);
459 TmpInst.setOpcode(X86::POP32r);
460 TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
461 printInstruction(&TmpInst);
467 MCInstLowering.Lower(MI, TmpInst);
470 printInstruction(&TmpInst);