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 //===----------------------------------------------------------------------===//
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"
27 MCSymbol *X86ATTAsmPrinter::GetPICBaseSymbol() {
28 // FIXME: the actual label generated doesn't matter here! Just mangle in
29 // something unique (the function number) with Private prefix.
32 if (Subtarget->isTargetDarwin()) {
33 raw_svector_ostream(Name) << 'L' << getFunctionNumber() << "$pb";
35 assert(Subtarget->isTargetELF() && "Don't know how to print PIC label!");
36 raw_svector_ostream(Name) << ".Lllvm$" << getFunctionNumber()<<".$piclabel";
38 return OutContext.GetOrCreateSymbol(Name.str());
42 /// LowerGlobalAddressOperand - Lower an MO_GlobalAddress operand to an
44 MCSymbol *X86ATTAsmPrinter::GetGlobalAddressSymbol(const MachineOperand &MO) {
45 const GlobalValue *GV = MO.getGlobal();
47 bool isImplicitlyPrivate = false;
48 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB ||
49 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
50 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
51 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
52 isImplicitlyPrivate = true;
54 SmallString<128> Name;
55 Mang->getNameWithPrefix(Name, GV, isImplicitlyPrivate);
57 if (Subtarget->isTargetCygMing())
58 DecorateCygMingName(Name, GV);
60 switch (MO.getTargetFlags()) {
61 default: llvm_unreachable("Unknown target flag on GV operand");
62 case X86II::MO_NO_FLAG: // No flag.
63 case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name.
64 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
66 case X86II::MO_DLLIMPORT: {
67 // Handle dllimport linkage.
68 const char *Prefix = "__imp_";
69 Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
72 case X86II::MO_DARWIN_NONLAZY:
73 case X86II::MO_DARWIN_NONLAZY_PIC_BASE: {
74 Name += "$non_lazy_ptr";
75 MCSymbol *Sym = OutContext.GetOrCreateSymbol(Name.str());
76 MCSymbol *&StubSym = GVStubs[Sym];
79 Mang->getNameWithPrefix(Name, GV, false);
80 StubSym = OutContext.GetOrCreateSymbol(Name.str());
85 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
86 Name += "$non_lazy_ptr";
87 HiddenGVStubs[Name.str()] = StringRef(Name.data(), Name.size()-13);
89 case X86II::MO_DARWIN_STUB: {
91 MCSymbol *Sym = OutContext.GetOrCreateSymbol(Name.str());
92 MCSymbol *&StubSym = FnStubs[Sym];
95 Mang->getNameWithPrefix(Name, GV, false);
96 StubSym = OutContext.GetOrCreateSymbol(Name.str());
100 // FIXME: These probably should be a modifier on the symbol or something??
101 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
102 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
103 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
104 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
105 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
106 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
107 case X86II::MO_GOT: Name += "@GOT"; break;
108 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
109 case X86II::MO_PLT: Name += "@PLT"; break;
112 return OutContext.GetOrCreateSymbol(Name.str());
115 MCSymbol *X86ATTAsmPrinter::GetExternalSymbolSymbol(const MachineOperand &MO) {
116 SmallString<128> Name;
117 Name += MAI->getGlobalPrefix();
118 Name += MO.getSymbolName();
120 switch (MO.getTargetFlags()) {
121 default: llvm_unreachable("Unknown target flag on GV operand");
122 case X86II::MO_NO_FLAG: // No flag.
123 case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name.
124 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
126 case X86II::MO_DLLIMPORT: {
127 // Handle dllimport linkage.
128 const char *Prefix = "__imp_";
129 Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
132 case X86II::MO_DARWIN_STUB: {
134 MCSymbol *Sym = OutContext.GetOrCreateSymbol(Name.str());
135 MCSymbol *&StubSym = FnStubs[Sym];
137 Name.erase(Name.end()-5, Name.end());
138 StubSym = OutContext.GetOrCreateSymbol(Name.str());
142 // FIXME: These probably should be a modifier on the symbol or something??
143 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
144 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
145 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
146 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
147 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
148 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
149 case X86II::MO_GOT: Name += "@GOT"; break;
150 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
151 case X86II::MO_PLT: Name += "@PLT"; break;
154 return OutContext.GetOrCreateSymbol(Name.str());
157 MCSymbol *X86ATTAsmPrinter::GetJumpTableSymbol(const MachineOperand &MO) {
158 SmallString<256> Name;
159 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "JTI"
160 << getFunctionNumber() << '_' << MO.getIndex();
162 switch (MO.getTargetFlags()) {
164 llvm_unreachable("Unknown target flag on GV operand");
165 case X86II::MO_NO_FLAG: // No flag.
166 case X86II::MO_PIC_BASE_OFFSET:
167 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
168 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
170 // FIXME: These probably should be a modifier on the symbol or something??
171 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
172 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
173 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
174 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
175 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
176 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
177 case X86II::MO_GOT: Name += "@GOT"; break;
178 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
179 case X86II::MO_PLT: Name += "@PLT"; break;
182 // Create a symbol for the name.
183 return OutContext.GetOrCreateSymbol(Name.str());
187 MCSymbol *X86ATTAsmPrinter::
188 GetConstantPoolIndexSymbol(const MachineOperand &MO) {
189 SmallString<256> Name;
190 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI"
191 << getFunctionNumber() << '_' << MO.getIndex();
193 switch (MO.getTargetFlags()) {
195 llvm_unreachable("Unknown target flag on GV operand");
196 case X86II::MO_NO_FLAG: // No flag.
197 case X86II::MO_PIC_BASE_OFFSET:
198 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
199 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
201 // FIXME: These probably should be a modifier on the symbol or something??
202 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
203 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
204 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
205 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
206 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
207 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
208 case X86II::MO_GOT: Name += "@GOT"; break;
209 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
210 case X86II::MO_PLT: Name += "@PLT"; break;
213 // Create a symbol for the name.
214 return OutContext.GetOrCreateSymbol(Name.str());
217 MCOperand X86ATTAsmPrinter::LowerSymbolOperand(const MachineOperand &MO,
219 // FIXME: We would like an efficient form for this, so we don't have to do a
220 // lot of extra uniquing.
221 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, OutContext);
223 switch (MO.getTargetFlags()) {
224 default: llvm_unreachable("Unknown target flag on GV operand");
225 case X86II::MO_NO_FLAG: // No flag.
227 // These affect the name of the symbol, not any suffix.
228 case X86II::MO_DARWIN_NONLAZY:
229 case X86II::MO_DLLIMPORT:
230 case X86II::MO_DARWIN_STUB:
231 case X86II::MO_TLSGD:
232 case X86II::MO_GOTTPOFF:
233 case X86II::MO_INDNTPOFF:
234 case X86II::MO_TPOFF:
235 case X86II::MO_NTPOFF:
236 case X86II::MO_GOTPCREL:
238 case X86II::MO_GOTOFF:
241 case X86II::MO_PIC_BASE_OFFSET:
242 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
243 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
244 // Subtract the pic base.
245 Expr = MCBinaryExpr::CreateSub(Expr,
246 MCSymbolRefExpr::Create(GetPICBaseSymbol(),
250 case X86II::MO_GOT_ABSOLUTE_ADDRESS: {
251 // For this, we want to print something like:
252 // MYSYMBOL + (. - PICBASE)
253 // However, we can't generate a ".", so just emit a new label here and refer
254 // to it. We know that this operand flag occurs at most once per function.
255 SmallString<64> Name;
256 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "picbaseref"
257 << getFunctionNumber();
258 MCSymbol *DotSym = OutContext.GetOrCreateSymbol(Name.str());
259 OutStreamer.EmitLabel(DotSym);
261 const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext);
262 const MCExpr *PICBase = MCSymbolRefExpr::Create(GetPICBaseSymbol(),
264 DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext);
265 Expr = MCBinaryExpr::CreateAdd(Expr, DotExpr, OutContext);
270 if (!MO.isJTI() && MO.getOffset())
271 Expr = MCBinaryExpr::CreateAdd(Expr, MCConstantExpr::Create(MO.getOffset(),
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));
299 void X86ATTAsmPrinter::
300 printInstructionThroughMCStreamer(const MachineInstr *MI) {
302 switch (MI->getOpcode()) {
303 case TargetInstrInfo::DBG_LABEL:
304 case TargetInstrInfo::EH_LABEL:
305 case TargetInstrInfo::GC_LABEL:
308 case TargetInstrInfo::INLINEASM:
312 case TargetInstrInfo::IMPLICIT_DEF:
313 printImplicitDef(MI);
315 case X86::MOVPC32r: {
316 // This is a pseudo op for a two instruction sequence with a label, which
323 MCSymbol *PICBase = GetPICBaseSymbol();
324 TmpInst.setOpcode(X86::CALLpcrel32);
325 // FIXME: We would like an efficient form for this, so we don't have to do a
326 // lot of extra uniquing.
327 TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
329 printInstruction(&TmpInst);
333 OutStreamer.EmitLabel(PICBase);
336 TmpInst.setOpcode(X86::POP32r);
337 TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
338 printInstruction(&TmpInst);
343 TmpInst.setOpcode(MI->getOpcode());
345 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
346 const MachineOperand &MO = MI->getOperand(i);
349 switch (MO.getType()) {
352 errs() << "Cannot lower operand #" << i << " of :" << *MI;
353 llvm_unreachable("Unimp");
354 case MachineOperand::MO_Register:
355 MCOp = MCOperand::CreateReg(MO.getReg());
357 case MachineOperand::MO_Immediate:
358 MCOp = MCOperand::CreateImm(MO.getImm());
360 case MachineOperand::MO_MachineBasicBlock:
361 MCOp = MCOperand::CreateMBBLabel(getFunctionNumber(),
362 MO.getMBB()->getNumber());
364 case MachineOperand::MO_GlobalAddress:
365 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
367 case MachineOperand::MO_ExternalSymbol:
368 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
370 case MachineOperand::MO_JumpTableIndex:
371 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
373 case MachineOperand::MO_ConstantPoolIndex:
374 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
378 TmpInst.addOperand(MCOp);
381 // Handle a few special cases to eliminate operand modifiers.
382 switch (TmpInst.getOpcode()) {
383 case X86::LEA64_32r: // Handle 'subreg rewriting' for the lea64_32mem operand.
384 lower_lea64_32mem(&TmpInst, 1);
387 TmpInst.setOpcode(X86::MOV32r0);
388 lower_subreg32(&TmpInst, 0);
390 case X86::MOVZX16rr8:
391 TmpInst.setOpcode(X86::MOVZX32rr8);
392 lower_subreg32(&TmpInst, 0);
394 case X86::MOVZX16rm8:
395 TmpInst.setOpcode(X86::MOVZX32rm8);
396 lower_subreg32(&TmpInst, 0);
398 case X86::MOVSX16rr8:
399 TmpInst.setOpcode(X86::MOVSX32rr8);
400 lower_subreg32(&TmpInst, 0);
402 case X86::MOVSX16rm8:
403 TmpInst.setOpcode(X86::MOVSX32rm8);
404 lower_subreg32(&TmpInst, 0);
406 case X86::MOVZX64rr32:
407 TmpInst.setOpcode(X86::MOV32rr);
408 lower_subreg32(&TmpInst, 0);
410 case X86::MOVZX64rm32:
411 TmpInst.setOpcode(X86::MOV32rm);
412 lower_subreg32(&TmpInst, 0);
414 case X86::MOV64ri64i32:
415 TmpInst.setOpcode(X86::MOV32ri);
416 lower_subreg32(&TmpInst, 0);
418 case X86::MOVZX64rr8:
419 TmpInst.setOpcode(X86::MOVZX32rr8);
420 lower_subreg32(&TmpInst, 0);
422 case X86::MOVZX64rm8:
423 TmpInst.setOpcode(X86::MOVZX32rm8);
424 lower_subreg32(&TmpInst, 0);
426 case X86::MOVZX64rr16:
427 TmpInst.setOpcode(X86::MOVZX32rr16);
428 lower_subreg32(&TmpInst, 0);
430 case X86::MOVZX64rm16:
431 TmpInst.setOpcode(X86::MOVZX32rm16);
432 lower_subreg32(&TmpInst, 0);
436 printInstruction(&TmpInst);