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) {
117 FnStubs[Name+"$stub"] = Name;
121 return OutContext.GetOrCreateSymbol(Name);
124 MCSymbol *X86ATTAsmPrinter::GetJumpTableSymbol(const MachineOperand &MO) {
125 SmallString<256> Name;
126 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "JTI"
127 << getFunctionNumber() << '_' << MO.getIndex();
129 switch (MO.getTargetFlags()) {
131 llvm_unreachable("Unknown target flag on GV operand");
132 case X86II::MO_NO_FLAG: // No flag.
133 case X86II::MO_PIC_BASE_OFFSET:
134 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
135 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
137 // FIXME: These probably should be a modifier on the symbol or something??
138 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
139 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
140 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
141 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
142 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
143 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
144 case X86II::MO_GOT: Name += "@GOT"; break;
145 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
146 case X86II::MO_PLT: Name += "@PLT"; break;
149 // Create a symbol for the name.
150 return OutContext.GetOrCreateSymbol(Name.str());
154 MCSymbol *X86ATTAsmPrinter::
155 GetConstantPoolIndexSymbol(const MachineOperand &MO) {
156 SmallString<256> Name;
157 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI"
158 << getFunctionNumber() << '_' << MO.getIndex();
160 switch (MO.getTargetFlags()) {
162 llvm_unreachable("Unknown target flag on GV operand");
163 case X86II::MO_NO_FLAG: // No flag.
164 case X86II::MO_PIC_BASE_OFFSET:
165 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
166 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
168 // FIXME: These probably should be a modifier on the symbol or something??
169 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
170 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
171 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
172 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
173 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
174 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
175 case X86II::MO_GOT: Name += "@GOT"; break;
176 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
177 case X86II::MO_PLT: Name += "@PLT"; break;
180 // Create a symbol for the name.
181 return OutContext.GetOrCreateSymbol(Name.str());
184 MCOperand X86ATTAsmPrinter::LowerSymbolOperand(const MachineOperand &MO,
186 // FIXME: We would like an efficient form for this, so we don't have to do a
187 // lot of extra uniquing.
188 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, OutContext);
190 switch (MO.getTargetFlags()) {
191 default: llvm_unreachable("Unknown target flag on GV operand");
192 case X86II::MO_NO_FLAG: // No flag.
194 // These affect the name of the symbol, not any suffix.
195 case X86II::MO_DARWIN_NONLAZY:
196 case X86II::MO_DLLIMPORT:
197 case X86II::MO_DARWIN_STUB:
198 case X86II::MO_TLSGD:
199 case X86II::MO_GOTTPOFF:
200 case X86II::MO_INDNTPOFF:
201 case X86II::MO_TPOFF:
202 case X86II::MO_NTPOFF:
203 case X86II::MO_GOTPCREL:
205 case X86II::MO_GOTOFF:
208 case X86II::MO_PIC_BASE_OFFSET:
209 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
210 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
211 // Subtract the pic base.
212 Expr = MCBinaryExpr::CreateSub(Expr,
213 MCSymbolRefExpr::Create(GetPICBaseSymbol(),
217 case X86II::MO_GOT_ABSOLUTE_ADDRESS: {
218 // For this, we want to print something like:
219 // MYSYMBOL + (. - PICBASE)
220 // However, we can't generate a ".", so just emit a new label here and refer
221 // to it. We know that this operand flag occurs at most once per function.
222 SmallString<64> Name;
223 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "picbaseref"
224 << getFunctionNumber();
225 MCSymbol *DotSym = OutContext.GetOrCreateSymbol(Name.str());
226 OutStreamer.EmitLabel(DotSym);
228 const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext);
229 const MCExpr *PICBase = MCSymbolRefExpr::Create(GetPICBaseSymbol(),
231 DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext);
232 Expr = MCBinaryExpr::CreateAdd(Expr, DotExpr, OutContext);
237 if (!MO.isJTI() && MO.getOffset())
238 Expr = MCBinaryExpr::CreateAdd(Expr, MCConstantExpr::Create(MO.getOffset(),
241 return MCOperand::CreateExpr(Expr);
244 void X86ATTAsmPrinter::
245 printInstructionThroughMCStreamer(const MachineInstr *MI) {
249 switch (MI->getOpcode()) {
250 case TargetInstrInfo::DBG_LABEL:
251 case TargetInstrInfo::EH_LABEL:
252 case TargetInstrInfo::GC_LABEL:
255 case TargetInstrInfo::INLINEASM:
259 case TargetInstrInfo::IMPLICIT_DEF:
260 printImplicitDef(MI);
262 case X86::MOVPC32r: {
263 // This is a pseudo op for a two instruction sequence with a label, which
270 MCSymbol *PICBase = GetPICBaseSymbol();
271 TmpInst.setOpcode(X86::CALLpcrel32);
272 // FIXME: We would like an efficient form for this, so we don't have to do a
273 // lot of extra uniquing.
274 TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
276 printInstruction(&TmpInst);
279 OutStreamer.EmitLabel(PICBase);
282 TmpInst.setOpcode(X86::POP32r);
283 TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
284 printInstruction(&TmpInst);
289 TmpInst.setOpcode(MI->getOpcode());
291 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
292 const MachineOperand &MO = MI->getOperand(i);
295 switch (MO.getType()) {
298 errs() << "Cannot lower operand #" << i << " of :" << *MI;
299 llvm_unreachable("Unimp");
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::CreateMBBLabel(getFunctionNumber(),
308 MO.getMBB()->getNumber());
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 TmpInst.addOperand(MCOp);
327 switch (TmpInst.getOpcode()) {
329 // Handle the 'subreg rewriting' for the lea64_32mem operand.
330 lower_lea64_32mem(&TmpInst, 1);
333 TmpInst.setOpcode(X86::MOV32r0);
334 lower_subreg32(&TmpInst, 0);
336 case X86::MOVZX16rr8:
337 TmpInst.setOpcode(X86::MOVZX32rr8);
338 lower_subreg32(&TmpInst, 0);
340 case X86::MOVZX16rm8:
341 TmpInst.setOpcode(X86::MOVZX32rm8);
342 lower_subreg32(&TmpInst, 0);
344 case X86::MOVSX16rr8:
345 TmpInst.setOpcode(X86::MOVSX32rr8);
346 lower_subreg32(&TmpInst, 0);
348 case X86::MOVSX16rm8:
349 TmpInst.setOpcode(X86::MOVSX32rm8);
350 lower_subreg32(&TmpInst, 0);
352 case X86::MOVZX64rr32:
353 TmpInst.setOpcode(X86::MOV32rr);
354 lower_subreg32(&TmpInst, 0);
356 case X86::MOVZX64rm32:
357 TmpInst.setOpcode(X86::MOV32rm);
358 lower_subreg32(&TmpInst, 0);
360 case X86::MOV64ri64i32:
361 TmpInst.setOpcode(X86::MOV32ri);
362 lower_subreg32(&TmpInst, 0);
364 case X86::MOVZX64rr8:
365 TmpInst.setOpcode(X86::MOVZX32rr8);
366 lower_subreg32(&TmpInst, 0);
368 case X86::MOVZX64rm8:
369 TmpInst.setOpcode(X86::MOVZX32rm8);
370 lower_subreg32(&TmpInst, 0);
372 case X86::MOVZX64rr16:
373 TmpInst.setOpcode(X86::MOVZX32rr16);
374 lower_subreg32(&TmpInst, 0);
376 case X86::MOVZX64rm16:
377 TmpInst.setOpcode(X86::MOVZX32rm16);
378 lower_subreg32(&TmpInst, 0);
382 printInstruction(&TmpInst);