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 GVStubs[Name.str()] = StringRef(Name.data(), Name.size()-13);
77 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
78 Name += "$non_lazy_ptr";
79 HiddenGVStubs[Name.str()] = StringRef(Name.data(), Name.size()-13);
81 case X86II::MO_DARWIN_STUB:
83 FnStubs[Name.str()] = StringRef(Name.data(), Name.size()-5);
85 // FIXME: These probably should be a modifier on the symbol or something??
86 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
87 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
88 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
89 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
90 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
91 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
92 case X86II::MO_GOT: Name += "@GOT"; break;
93 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
94 case X86II::MO_PLT: Name += "@PLT"; break;
97 return OutContext.GetOrCreateSymbol(Name.str());
100 MCSymbol *X86ATTAsmPrinter::GetExternalSymbolSymbol(const MachineOperand &MO) {
101 SmallString<128> Name;
102 Name += MAI->getGlobalPrefix();
103 Name += MO.getSymbolName();
105 switch (MO.getTargetFlags()) {
106 default: llvm_unreachable("Unknown target flag on GV operand");
107 case X86II::MO_NO_FLAG: // No flag.
108 case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name.
109 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
111 case X86II::MO_DLLIMPORT: {
112 // Handle dllimport linkage.
113 const char *Prefix = "__imp_";
114 Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
117 case X86II::MO_DARWIN_STUB:
118 // Insert: FnStub["_foo$stub"] = "_foo";
120 FnStubs[Name.str()] = StringRef(Name.data(), Name.size()-5);
122 // FIXME: These probably should be a modifier on the symbol or something??
123 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
124 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
125 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
126 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
127 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
128 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
129 case X86II::MO_GOT: Name += "@GOT"; break;
130 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
131 case X86II::MO_PLT: Name += "@PLT"; break;
134 return OutContext.GetOrCreateSymbol(Name.str());
137 MCSymbol *X86ATTAsmPrinter::GetJumpTableSymbol(const MachineOperand &MO) {
138 SmallString<256> Name;
139 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "JTI"
140 << getFunctionNumber() << '_' << MO.getIndex();
142 switch (MO.getTargetFlags()) {
144 llvm_unreachable("Unknown target flag on GV operand");
145 case X86II::MO_NO_FLAG: // No flag.
146 case X86II::MO_PIC_BASE_OFFSET:
147 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
148 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
150 // FIXME: These probably should be a modifier on the symbol or something??
151 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
152 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
153 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
154 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
155 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
156 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
157 case X86II::MO_GOT: Name += "@GOT"; break;
158 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
159 case X86II::MO_PLT: Name += "@PLT"; break;
162 // Create a symbol for the name.
163 return OutContext.GetOrCreateSymbol(Name.str());
167 MCSymbol *X86ATTAsmPrinter::
168 GetConstantPoolIndexSymbol(const MachineOperand &MO) {
169 SmallString<256> Name;
170 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI"
171 << getFunctionNumber() << '_' << MO.getIndex();
173 switch (MO.getTargetFlags()) {
175 llvm_unreachable("Unknown target flag on GV operand");
176 case X86II::MO_NO_FLAG: // No flag.
177 case X86II::MO_PIC_BASE_OFFSET:
178 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
179 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
181 // FIXME: These probably should be a modifier on the symbol or something??
182 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
183 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
184 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
185 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
186 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
187 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
188 case X86II::MO_GOT: Name += "@GOT"; break;
189 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
190 case X86II::MO_PLT: Name += "@PLT"; break;
193 // Create a symbol for the name.
194 return OutContext.GetOrCreateSymbol(Name.str());
197 MCOperand X86ATTAsmPrinter::LowerSymbolOperand(const MachineOperand &MO,
199 // FIXME: We would like an efficient form for this, so we don't have to do a
200 // lot of extra uniquing.
201 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, OutContext);
203 switch (MO.getTargetFlags()) {
204 default: llvm_unreachable("Unknown target flag on GV operand");
205 case X86II::MO_NO_FLAG: // No flag.
207 // These affect the name of the symbol, not any suffix.
208 case X86II::MO_DARWIN_NONLAZY:
209 case X86II::MO_DLLIMPORT:
210 case X86II::MO_DARWIN_STUB:
211 case X86II::MO_TLSGD:
212 case X86II::MO_GOTTPOFF:
213 case X86II::MO_INDNTPOFF:
214 case X86II::MO_TPOFF:
215 case X86II::MO_NTPOFF:
216 case X86II::MO_GOTPCREL:
218 case X86II::MO_GOTOFF:
221 case X86II::MO_PIC_BASE_OFFSET:
222 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
223 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
224 // Subtract the pic base.
225 Expr = MCBinaryExpr::CreateSub(Expr,
226 MCSymbolRefExpr::Create(GetPICBaseSymbol(),
230 case X86II::MO_GOT_ABSOLUTE_ADDRESS: {
231 // For this, we want to print something like:
232 // MYSYMBOL + (. - PICBASE)
233 // However, we can't generate a ".", so just emit a new label here and refer
234 // to it. We know that this operand flag occurs at most once per function.
235 SmallString<64> Name;
236 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "picbaseref"
237 << getFunctionNumber();
238 MCSymbol *DotSym = OutContext.GetOrCreateSymbol(Name.str());
239 OutStreamer.EmitLabel(DotSym);
241 const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext);
242 const MCExpr *PICBase = MCSymbolRefExpr::Create(GetPICBaseSymbol(),
244 DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext);
245 Expr = MCBinaryExpr::CreateAdd(Expr, DotExpr, OutContext);
250 if (!MO.isJTI() && MO.getOffset())
251 Expr = MCBinaryExpr::CreateAdd(Expr, MCConstantExpr::Create(MO.getOffset(),
254 return MCOperand::CreateExpr(Expr);
259 static void lower_subreg32(MCInst *MI, unsigned OpNo) {
260 // Convert registers in the addr mode according to subreg32.
261 unsigned Reg = MI->getOperand(OpNo).getReg();
263 MI->getOperand(OpNo).setReg(getX86SubSuperRegister(Reg, MVT::i32));
266 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
267 // Convert registers in the addr mode according to subreg64.
268 for (unsigned i = 0; i != 4; ++i) {
269 if (!MI->getOperand(OpNo+i).isReg()) continue;
271 unsigned Reg = MI->getOperand(OpNo+i).getReg();
272 if (Reg == 0) continue;
274 MI->getOperand(OpNo+i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
279 void X86ATTAsmPrinter::
280 printInstructionThroughMCStreamer(const MachineInstr *MI) {
282 switch (MI->getOpcode()) {
283 case TargetInstrInfo::DBG_LABEL:
284 case TargetInstrInfo::EH_LABEL:
285 case TargetInstrInfo::GC_LABEL:
288 case TargetInstrInfo::INLINEASM:
292 case TargetInstrInfo::IMPLICIT_DEF:
293 printImplicitDef(MI);
295 case X86::MOVPC32r: {
296 // This is a pseudo op for a two instruction sequence with a label, which
303 MCSymbol *PICBase = GetPICBaseSymbol();
304 TmpInst.setOpcode(X86::CALLpcrel32);
305 // FIXME: We would like an efficient form for this, so we don't have to do a
306 // lot of extra uniquing.
307 TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
309 printInstruction(&TmpInst);
312 OutStreamer.EmitLabel(PICBase);
315 TmpInst.setOpcode(X86::POP32r);
316 TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
317 printInstruction(&TmpInst);
322 TmpInst.setOpcode(MI->getOpcode());
324 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
325 const MachineOperand &MO = MI->getOperand(i);
328 switch (MO.getType()) {
331 errs() << "Cannot lower operand #" << i << " of :" << *MI;
332 llvm_unreachable("Unimp");
333 case MachineOperand::MO_Register:
334 MCOp = MCOperand::CreateReg(MO.getReg());
336 case MachineOperand::MO_Immediate:
337 MCOp = MCOperand::CreateImm(MO.getImm());
339 case MachineOperand::MO_MachineBasicBlock:
340 MCOp = MCOperand::CreateMBBLabel(getFunctionNumber(),
341 MO.getMBB()->getNumber());
343 case MachineOperand::MO_GlobalAddress:
344 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
346 case MachineOperand::MO_ExternalSymbol:
347 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
349 case MachineOperand::MO_JumpTableIndex:
350 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
352 case MachineOperand::MO_ConstantPoolIndex:
353 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
357 TmpInst.addOperand(MCOp);
360 // Handle a few special cases to eliminate operand modifiers.
361 switch (TmpInst.getOpcode()) {
362 case X86::LEA64_32r: // Handle 'subreg rewriting' for the lea64_32mem operand.
363 lower_lea64_32mem(&TmpInst, 1);
366 TmpInst.setOpcode(X86::MOV32r0);
367 lower_subreg32(&TmpInst, 0);
369 case X86::MOVZX16rr8:
370 TmpInst.setOpcode(X86::MOVZX32rr8);
371 lower_subreg32(&TmpInst, 0);
373 case X86::MOVZX16rm8:
374 TmpInst.setOpcode(X86::MOVZX32rm8);
375 lower_subreg32(&TmpInst, 0);
377 case X86::MOVSX16rr8:
378 TmpInst.setOpcode(X86::MOVSX32rr8);
379 lower_subreg32(&TmpInst, 0);
381 case X86::MOVSX16rm8:
382 TmpInst.setOpcode(X86::MOVSX32rm8);
383 lower_subreg32(&TmpInst, 0);
385 case X86::MOVZX64rr32:
386 TmpInst.setOpcode(X86::MOV32rr);
387 lower_subreg32(&TmpInst, 0);
389 case X86::MOVZX64rm32:
390 TmpInst.setOpcode(X86::MOV32rm);
391 lower_subreg32(&TmpInst, 0);
393 case X86::MOV64ri64i32:
394 TmpInst.setOpcode(X86::MOV32ri);
395 lower_subreg32(&TmpInst, 0);
397 case X86::MOVZX64rr8:
398 TmpInst.setOpcode(X86::MOVZX32rr8);
399 lower_subreg32(&TmpInst, 0);
401 case X86::MOVZX64rm8:
402 TmpInst.setOpcode(X86::MOVZX32rm8);
403 lower_subreg32(&TmpInst, 0);
405 case X86::MOVZX64rr16:
406 TmpInst.setOpcode(X86::MOVZX32rr16);
407 lower_subreg32(&TmpInst, 0);
409 case X86::MOVZX64rm16:
410 TmpInst.setOpcode(X86::MOVZX32rm16);
411 lower_subreg32(&TmpInst, 0);
415 printInstruction(&TmpInst);