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()<<".$piclabel";
38 return OutContext.GetOrCreateSymbol(Name.str());
42 static void lower_subreg32(MCInst *MI, unsigned OpNo) {
43 // Convert registers in the addr mode according to subreg32.
44 unsigned Reg = MI->getOperand(OpNo).getReg();
46 MI->getOperand(OpNo).setReg(getX86SubSuperRegister(Reg, MVT::i32));
50 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
51 // Convert registers in the addr mode according to subreg64.
52 for (unsigned i = 0; i != 4; ++i) {
53 if (!MI->getOperand(OpNo+i).isReg()) continue;
55 unsigned Reg = MI->getOperand(OpNo+i).getReg();
56 if (Reg == 0) continue;
58 MI->getOperand(OpNo+i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
62 /// LowerGlobalAddressOperand - Lower an MO_GlobalAddress operand to an
64 MCSymbol *X86ATTAsmPrinter::GetGlobalAddressSymbol(const MachineOperand &MO) {
65 const GlobalValue *GV = MO.getGlobal();
67 const char *Suffix = "";
68 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
70 else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
71 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
72 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
73 Suffix = "$non_lazy_ptr";
75 std::string Name = Mang->getMangledName(GV, Suffix, Suffix[0] != '\0');
76 if (Subtarget->isTargetCygMing())
77 DecorateCygMingName(Name, GV);
79 switch (MO.getTargetFlags()) {
80 default: llvm_unreachable("Unknown target flag on GV operand");
81 case X86II::MO_NO_FLAG: // No flag.
82 case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name.
83 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
85 case X86II::MO_DLLIMPORT:
86 // Handle dllimport linkage.
87 Name = "__imp_" + Name;
89 case X86II::MO_DARWIN_NONLAZY:
90 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
91 GVStubs[Name] = Mang->getMangledName(GV);
93 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
94 HiddenGVStubs[Name] = Mang->getMangledName(GV);
96 case X86II::MO_DARWIN_STUB:
97 FnStubs[Name] = Mang->getMangledName(GV);
99 // FIXME: These probably should be a modifier on the symbol or something??
100 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
101 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
102 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
103 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
104 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
105 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
106 case X86II::MO_GOT: Name += "@GOT"; break;
107 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
108 case X86II::MO_PLT: Name += "@PLT"; break;
111 return OutContext.GetOrCreateSymbol(Name);
114 MCSymbol *X86ATTAsmPrinter::GetExternalSymbolSymbol(const MachineOperand &MO) {
115 std::string Name = Mang->makeNameProper(MO.getSymbolName());
116 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
119 switch (MO.getTargetFlags()) {
120 default: llvm_unreachable("Unknown target flag on GV operand");
121 case X86II::MO_NO_FLAG: // No flag.
122 case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name.
123 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
125 case X86II::MO_DLLIMPORT:
126 // Handle dllimport linkage.
127 Name = "__imp_" + Name;
129 case X86II::MO_DARWIN_STUB:
130 FnStubs[Name] = Mang->makeNameProper(MO.getSymbolName());
132 // FIXME: These probably should be a modifier on the symbol or something??
133 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
134 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
135 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
136 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
137 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
138 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
139 case X86II::MO_GOT: Name += "@GOT"; break;
140 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
141 case X86II::MO_PLT: Name += "@PLT"; break;
144 return OutContext.GetOrCreateSymbol(Name);
147 MCSymbol *X86ATTAsmPrinter::GetJumpTableSymbol(const MachineOperand &MO) {
148 SmallString<256> Name;
149 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "JTI"
150 << getFunctionNumber() << '_' << MO.getIndex();
152 switch (MO.getTargetFlags()) {
154 llvm_unreachable("Unknown target flag on GV operand");
155 case X86II::MO_NO_FLAG: // No flag.
156 case X86II::MO_PIC_BASE_OFFSET:
157 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
158 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
160 // FIXME: These probably should be a modifier on the symbol or something??
161 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
162 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
163 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
164 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
165 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
166 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
167 case X86II::MO_GOT: Name += "@GOT"; break;
168 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
169 case X86II::MO_PLT: Name += "@PLT"; break;
172 // Create a symbol for the name.
173 return OutContext.GetOrCreateSymbol(Name.str());
177 MCSymbol *X86ATTAsmPrinter::
178 GetConstantPoolIndexSymbol(const MachineOperand &MO) {
179 SmallString<256> Name;
180 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI"
181 << getFunctionNumber() << '_' << MO.getIndex();
183 switch (MO.getTargetFlags()) {
185 llvm_unreachable("Unknown target flag on GV operand");
186 case X86II::MO_NO_FLAG: // No flag.
187 case X86II::MO_PIC_BASE_OFFSET:
188 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
189 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
191 // FIXME: These probably should be a modifier on the symbol or something??
192 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
193 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
194 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
195 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
196 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
197 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
198 case X86II::MO_GOT: Name += "@GOT"; break;
199 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
200 case X86II::MO_PLT: Name += "@PLT"; break;
203 // Create a symbol for the name.
204 return OutContext.GetOrCreateSymbol(Name.str());
207 MCOperand X86ATTAsmPrinter::LowerSymbolOperand(const MachineOperand &MO,
209 // FIXME: We would like an efficient form for this, so we don't have to do a
210 // lot of extra uniquing.
211 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, OutContext);
213 switch (MO.getTargetFlags()) {
214 default: llvm_unreachable("Unknown target flag on GV operand");
215 case X86II::MO_NO_FLAG: // No flag.
217 // These affect the name of the symbol, not any suffix.
218 case X86II::MO_DARWIN_NONLAZY:
219 case X86II::MO_DLLIMPORT:
220 case X86II::MO_DARWIN_STUB:
221 case X86II::MO_TLSGD:
222 case X86II::MO_GOTTPOFF:
223 case X86II::MO_INDNTPOFF:
224 case X86II::MO_TPOFF:
225 case X86II::MO_NTPOFF:
226 case X86II::MO_GOTPCREL:
228 case X86II::MO_GOTOFF:
231 case X86II::MO_PIC_BASE_OFFSET:
232 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
233 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
234 // Subtract the pic base.
235 Expr = MCBinaryExpr::CreateSub(Expr,
236 MCSymbolRefExpr::Create(GetPICBaseSymbol(),
240 case X86II::MO_GOT_ABSOLUTE_ADDRESS: {
241 // For this, we want to print something like:
242 // MYSYMBOL + (. - PICBASE)
243 // However, we can't generate a ".", so just emit a new label here and refer
244 // to it. We know that this operand flag occurs at most once per function.
245 SmallString<64> Name;
246 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "picbaseref"
247 << getFunctionNumber();
248 MCSymbol *DotSym = OutContext.GetOrCreateSymbol(Name.str());
249 OutStreamer.EmitLabel(DotSym);
251 const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext);
252 const MCExpr *PICBase = MCSymbolRefExpr::Create(GetPICBaseSymbol(),
254 DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext);
255 Expr = MCBinaryExpr::CreateAdd(Expr, DotExpr, OutContext);
260 if (!MO.isJTI() && MO.getOffset())
261 Expr = MCBinaryExpr::CreateAdd(Expr, MCConstantExpr::Create(MO.getOffset(),
264 return MCOperand::CreateExpr(Expr);
267 void X86ATTAsmPrinter::
268 printInstructionThroughMCStreamer(const MachineInstr *MI) {
272 switch (MI->getOpcode()) {
273 case TargetInstrInfo::DBG_LABEL:
274 case TargetInstrInfo::EH_LABEL:
275 case TargetInstrInfo::GC_LABEL:
278 case TargetInstrInfo::INLINEASM:
282 case TargetInstrInfo::IMPLICIT_DEF:
283 printImplicitDef(MI);
285 case X86::MOVPC32r: {
286 // This is a pseudo op for a two instruction sequence with a label, which
293 MCSymbol *PICBase = GetPICBaseSymbol();
294 TmpInst.setOpcode(X86::CALLpcrel32);
295 // FIXME: We would like an efficient form for this, so we don't have to do a
296 // lot of extra uniquing.
297 TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
299 printInstruction(&TmpInst);
302 OutStreamer.EmitLabel(PICBase);
305 TmpInst.setOpcode(X86::POP32r);
306 TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
307 printInstruction(&TmpInst);
312 TmpInst.setOpcode(MI->getOpcode());
314 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
315 const MachineOperand &MO = MI->getOperand(i);
318 switch (MO.getType()) {
321 errs() << "Cannot lower operand #" << i << " of :" << *MI;
322 llvm_unreachable("Unimp");
323 case MachineOperand::MO_Register:
324 MCOp = MCOperand::CreateReg(MO.getReg());
326 case MachineOperand::MO_Immediate:
327 MCOp = MCOperand::CreateImm(MO.getImm());
329 case MachineOperand::MO_MachineBasicBlock:
330 MCOp = MCOperand::CreateMBBLabel(getFunctionNumber(),
331 MO.getMBB()->getNumber());
333 case MachineOperand::MO_GlobalAddress:
334 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
336 case MachineOperand::MO_ExternalSymbol:
337 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
339 case MachineOperand::MO_JumpTableIndex:
340 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
342 case MachineOperand::MO_ConstantPoolIndex:
343 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
347 TmpInst.addOperand(MCOp);
350 switch (TmpInst.getOpcode()) {
352 // Handle the 'subreg rewriting' for the lea64_32mem operand.
353 lower_lea64_32mem(&TmpInst, 1);
356 TmpInst.setOpcode(X86::MOV32r0);
357 lower_subreg32(&TmpInst, 0);
359 case X86::MOVZX16rr8:
360 TmpInst.setOpcode(X86::MOVZX32rr8);
361 lower_subreg32(&TmpInst, 0);
363 case X86::MOVZX16rm8:
364 TmpInst.setOpcode(X86::MOVZX32rm8);
365 lower_subreg32(&TmpInst, 0);
367 case X86::MOVSX16rr8:
368 TmpInst.setOpcode(X86::MOVSX32rr8);
369 lower_subreg32(&TmpInst, 0);
371 case X86::MOVSX16rm8:
372 TmpInst.setOpcode(X86::MOVSX32rm8);
373 lower_subreg32(&TmpInst, 0);
375 case X86::MOVZX64rr32:
376 TmpInst.setOpcode(X86::MOV32rr);
377 lower_subreg32(&TmpInst, 0);
379 case X86::MOVZX64rm32:
380 TmpInst.setOpcode(X86::MOV32rm);
381 lower_subreg32(&TmpInst, 0);
383 case X86::MOV64ri64i32:
384 TmpInst.setOpcode(X86::MOV32ri);
385 lower_subreg32(&TmpInst, 0);
387 case X86::MOVZX64rr8:
388 TmpInst.setOpcode(X86::MOVZX32rr8);
389 lower_subreg32(&TmpInst, 0);
391 case X86::MOVZX64rm8:
392 TmpInst.setOpcode(X86::MOVZX32rm8);
393 lower_subreg32(&TmpInst, 0);
395 case X86::MOVZX64rr16:
396 TmpInst.setOpcode(X86::MOVZX32rr16);
397 lower_subreg32(&TmpInst, 0);
399 case X86::MOVZX64rm16:
400 TmpInst.setOpcode(X86::MOVZX32rm16);
401 lower_subreg32(&TmpInst, 0);
405 printInstruction(&TmpInst);