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 = MO.getSymbolName();
116 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
121 switch (MO.getTargetFlags()) {
122 default: llvm_unreachable("Unknown target flag on GV operand");
123 case X86II::MO_NO_FLAG: // No flag.
124 case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name.
125 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
127 case X86II::MO_DLLIMPORT:
128 // Handle dllimport linkage.
129 Name = "__imp_" + Name;
131 case X86II::MO_DARWIN_STUB:
132 FnStubs[Name] = MO.getSymbolName();
134 // FIXME: These probably should be a modifier on the symbol or something??
135 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
136 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
137 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
138 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
139 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
140 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
141 case X86II::MO_GOT: Name += "@GOT"; break;
142 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
143 case X86II::MO_PLT: Name += "@PLT"; break;
146 return OutContext.GetOrCreateSymbol(Name);
149 MCSymbol *X86ATTAsmPrinter::GetJumpTableSymbol(const MachineOperand &MO) {
150 SmallString<256> Name;
151 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "JTI"
152 << getFunctionNumber() << '_' << MO.getIndex();
154 switch (MO.getTargetFlags()) {
156 llvm_unreachable("Unknown target flag on GV operand");
157 case X86II::MO_NO_FLAG: // No flag.
158 case X86II::MO_PIC_BASE_OFFSET:
159 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
160 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
162 // FIXME: These probably should be a modifier on the symbol or something??
163 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
164 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
165 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
166 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
167 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
168 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
169 case X86II::MO_GOT: Name += "@GOT"; break;
170 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
171 case X86II::MO_PLT: Name += "@PLT"; break;
174 // Create a symbol for the name.
175 return OutContext.GetOrCreateSymbol(Name.str());
179 MCSymbol *X86ATTAsmPrinter::
180 GetConstantPoolIndexSymbol(const MachineOperand &MO) {
181 SmallString<256> Name;
182 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI"
183 << 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 OutContext.GetOrCreateSymbol(Name.str());
209 MCOperand X86ATTAsmPrinter::LowerSymbolOperand(const MachineOperand &MO,
211 // FIXME: We would like an efficient form for this, so we don't have to do a
212 // lot of extra uniquing.
213 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, OutContext);
215 switch (MO.getTargetFlags()) {
216 default: llvm_unreachable("Unknown target flag on GV operand");
217 case X86II::MO_NO_FLAG: // No flag.
219 // These affect the name of the symbol, not any suffix.
220 case X86II::MO_DARWIN_NONLAZY:
221 case X86II::MO_DLLIMPORT:
222 case X86II::MO_DARWIN_STUB:
223 case X86II::MO_TLSGD:
224 case X86II::MO_GOTTPOFF:
225 case X86II::MO_INDNTPOFF:
226 case X86II::MO_TPOFF:
227 case X86II::MO_NTPOFF:
228 case X86II::MO_GOTPCREL:
230 case X86II::MO_GOTOFF:
233 case X86II::MO_PIC_BASE_OFFSET:
234 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
235 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
236 // Subtract the pic base.
237 Expr = MCBinaryExpr::CreateSub(Expr,
238 MCSymbolRefExpr::Create(GetPICBaseSymbol(),
242 case X86II::MO_GOT_ABSOLUTE_ADDRESS: {
243 // For this, we want to print something like:
244 // MYSYMBOL + (. - PICBASE)
245 // However, we can't generate a ".", so just emit a new label here and refer
246 // to it. We know that this operand flag occurs at most once per function.
247 SmallString<64> Name;
248 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "picbaseref"
249 << getFunctionNumber();
250 MCSymbol *DotSym = OutContext.GetOrCreateSymbol(Name.str());
251 OutStreamer.EmitLabel(DotSym);
253 const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext);
254 const MCExpr *PICBase = MCSymbolRefExpr::Create(GetPICBaseSymbol(),
256 DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext);
257 Expr = MCBinaryExpr::CreateAdd(Expr, DotExpr, OutContext);
262 if (!MO.isJTI() && MO.getOffset())
263 Expr = MCBinaryExpr::CreateAdd(Expr, MCConstantExpr::Create(MO.getOffset(),
266 return MCOperand::CreateExpr(Expr);
269 void X86ATTAsmPrinter::
270 printInstructionThroughMCStreamer(const MachineInstr *MI) {
274 switch (MI->getOpcode()) {
275 case TargetInstrInfo::DBG_LABEL:
276 case TargetInstrInfo::EH_LABEL:
277 case TargetInstrInfo::GC_LABEL:
280 case TargetInstrInfo::INLINEASM:
284 case TargetInstrInfo::IMPLICIT_DEF:
285 printImplicitDef(MI);
287 case X86::MOVPC32r: {
288 // This is a pseudo op for a two instruction sequence with a label, which
295 MCSymbol *PICBase = GetPICBaseSymbol();
296 TmpInst.setOpcode(X86::CALLpcrel32);
297 // FIXME: We would like an efficient form for this, so we don't have to do a
298 // lot of extra uniquing.
299 TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
301 printInstruction(&TmpInst);
304 OutStreamer.EmitLabel(PICBase);
307 TmpInst.setOpcode(X86::POP32r);
308 TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
309 printInstruction(&TmpInst);
314 TmpInst.setOpcode(MI->getOpcode());
316 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
317 const MachineOperand &MO = MI->getOperand(i);
320 switch (MO.getType()) {
323 errs() << "Cannot lower operand #" << i << " of :" << *MI;
324 llvm_unreachable("Unimp");
325 case MachineOperand::MO_Register:
326 MCOp = MCOperand::CreateReg(MO.getReg());
328 case MachineOperand::MO_Immediate:
329 MCOp = MCOperand::CreateImm(MO.getImm());
331 case MachineOperand::MO_MachineBasicBlock:
332 MCOp = MCOperand::CreateMBBLabel(getFunctionNumber(),
333 MO.getMBB()->getNumber());
335 case MachineOperand::MO_GlobalAddress:
336 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
338 case MachineOperand::MO_ExternalSymbol:
339 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
341 case MachineOperand::MO_JumpTableIndex:
342 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
344 case MachineOperand::MO_ConstantPoolIndex:
345 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
349 TmpInst.addOperand(MCOp);
352 switch (TmpInst.getOpcode()) {
354 // Handle the 'subreg rewriting' for the lea64_32mem operand.
355 lower_lea64_32mem(&TmpInst, 1);
358 TmpInst.setOpcode(X86::MOV32r0);
359 lower_subreg32(&TmpInst, 0);
361 case X86::MOVZX16rr8:
362 TmpInst.setOpcode(X86::MOVZX32rr8);
363 lower_subreg32(&TmpInst, 0);
365 case X86::MOVZX16rm8:
366 TmpInst.setOpcode(X86::MOVZX32rm8);
367 lower_subreg32(&TmpInst, 0);
369 case X86::MOVSX16rr8:
370 TmpInst.setOpcode(X86::MOVSX32rr8);
371 lower_subreg32(&TmpInst, 0);
373 case X86::MOVSX16rm8:
374 TmpInst.setOpcode(X86::MOVSX32rm8);
375 lower_subreg32(&TmpInst, 0);
377 case X86::MOVZX64rr32:
378 TmpInst.setOpcode(X86::MOV32rr);
379 lower_subreg32(&TmpInst, 0);
381 case X86::MOVZX64rm32:
382 TmpInst.setOpcode(X86::MOV32rm);
383 lower_subreg32(&TmpInst, 0);
385 case X86::MOV64ri64i32:
386 TmpInst.setOpcode(X86::MOV32ri);
387 lower_subreg32(&TmpInst, 0);
389 case X86::MOVZX64rr8:
390 TmpInst.setOpcode(X86::MOVZX32rr8);
391 lower_subreg32(&TmpInst, 0);
393 case X86::MOVZX64rm8:
394 TmpInst.setOpcode(X86::MOVZX32rm8);
395 lower_subreg32(&TmpInst, 0);
397 case X86::MOVZX64rr16:
398 TmpInst.setOpcode(X86::MOVZX32rr16);
399 lower_subreg32(&TmpInst, 0);
401 case X86::MOVZX64rm16:
402 TmpInst.setOpcode(X86::MOVZX32rm16);
403 lower_subreg32(&TmpInst, 0);
407 printInstruction(&TmpInst);