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 MCSymbol *Sym = OutContext.GetOrCreateSymbol(Name.str());
88 MCSymbol *&StubSym = HiddenGVStubs[Sym];
91 Mang->getNameWithPrefix(Name, GV, false);
92 StubSym = OutContext.GetOrCreateSymbol(Name.str());
96 case X86II::MO_DARWIN_STUB: {
98 MCSymbol *Sym = OutContext.GetOrCreateSymbol(Name.str());
99 MCSymbol *&StubSym = FnStubs[Sym];
102 Mang->getNameWithPrefix(Name, GV, false);
103 StubSym = OutContext.GetOrCreateSymbol(Name.str());
107 // FIXME: These probably should be a modifier on the symbol or something??
108 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
109 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
110 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
111 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
112 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
113 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
114 case X86II::MO_GOT: Name += "@GOT"; break;
115 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
116 case X86II::MO_PLT: Name += "@PLT"; break;
119 return OutContext.GetOrCreateSymbol(Name.str());
122 MCSymbol *X86ATTAsmPrinter::GetExternalSymbolSymbol(const MachineOperand &MO) {
123 SmallString<128> Name;
124 Name += MAI->getGlobalPrefix();
125 Name += MO.getSymbolName();
127 switch (MO.getTargetFlags()) {
128 default: llvm_unreachable("Unknown target flag on GV operand");
129 case X86II::MO_NO_FLAG: // No flag.
130 case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name.
131 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
133 case X86II::MO_DLLIMPORT: {
134 // Handle dllimport linkage.
135 const char *Prefix = "__imp_";
136 Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
139 case X86II::MO_DARWIN_STUB: {
141 MCSymbol *Sym = OutContext.GetOrCreateSymbol(Name.str());
142 MCSymbol *&StubSym = FnStubs[Sym];
144 Name.erase(Name.end()-5, Name.end());
145 StubSym = OutContext.GetOrCreateSymbol(Name.str());
149 // FIXME: These probably should be a modifier on the symbol or something??
150 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
151 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
152 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
153 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
154 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
155 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
156 case X86II::MO_GOT: Name += "@GOT"; break;
157 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
158 case X86II::MO_PLT: Name += "@PLT"; break;
161 return OutContext.GetOrCreateSymbol(Name.str());
164 MCSymbol *X86ATTAsmPrinter::GetJumpTableSymbol(const MachineOperand &MO) {
165 SmallString<256> Name;
166 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "JTI"
167 << getFunctionNumber() << '_' << MO.getIndex();
169 switch (MO.getTargetFlags()) {
171 llvm_unreachable("Unknown target flag on GV operand");
172 case X86II::MO_NO_FLAG: // No flag.
173 case X86II::MO_PIC_BASE_OFFSET:
174 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
175 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
177 // FIXME: These probably should be a modifier on the symbol or something??
178 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
179 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
180 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
181 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
182 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
183 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
184 case X86II::MO_GOT: Name += "@GOT"; break;
185 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
186 case X86II::MO_PLT: Name += "@PLT"; break;
189 // Create a symbol for the name.
190 return OutContext.GetOrCreateSymbol(Name.str());
194 MCSymbol *X86ATTAsmPrinter::
195 GetConstantPoolIndexSymbol(const MachineOperand &MO) {
196 SmallString<256> Name;
197 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI"
198 << getFunctionNumber() << '_' << MO.getIndex();
200 switch (MO.getTargetFlags()) {
202 llvm_unreachable("Unknown target flag on GV operand");
203 case X86II::MO_NO_FLAG: // No flag.
204 case X86II::MO_PIC_BASE_OFFSET:
205 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
206 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
208 // FIXME: These probably should be a modifier on the symbol or something??
209 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
210 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
211 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
212 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
213 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
214 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
215 case X86II::MO_GOT: Name += "@GOT"; break;
216 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
217 case X86II::MO_PLT: Name += "@PLT"; break;
220 // Create a symbol for the name.
221 return OutContext.GetOrCreateSymbol(Name.str());
224 MCOperand X86ATTAsmPrinter::LowerSymbolOperand(const MachineOperand &MO,
226 // FIXME: We would like an efficient form for this, so we don't have to do a
227 // lot of extra uniquing.
228 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, OutContext);
230 switch (MO.getTargetFlags()) {
231 default: llvm_unreachable("Unknown target flag on GV operand");
232 case X86II::MO_NO_FLAG: // No flag.
234 // These affect the name of the symbol, not any suffix.
235 case X86II::MO_DARWIN_NONLAZY:
236 case X86II::MO_DLLIMPORT:
237 case X86II::MO_DARWIN_STUB:
238 case X86II::MO_TLSGD:
239 case X86II::MO_GOTTPOFF:
240 case X86II::MO_INDNTPOFF:
241 case X86II::MO_TPOFF:
242 case X86II::MO_NTPOFF:
243 case X86II::MO_GOTPCREL:
245 case X86II::MO_GOTOFF:
248 case X86II::MO_PIC_BASE_OFFSET:
249 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
250 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
251 // Subtract the pic base.
252 Expr = MCBinaryExpr::CreateSub(Expr,
253 MCSymbolRefExpr::Create(GetPICBaseSymbol(),
257 case X86II::MO_GOT_ABSOLUTE_ADDRESS: {
258 // For this, we want to print something like:
259 // MYSYMBOL + (. - PICBASE)
260 // However, we can't generate a ".", so just emit a new label here and refer
261 // to it. We know that this operand flag occurs at most once per function.
262 SmallString<64> Name;
263 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "picbaseref"
264 << getFunctionNumber();
265 MCSymbol *DotSym = OutContext.GetOrCreateSymbol(Name.str());
266 OutStreamer.EmitLabel(DotSym);
268 const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext);
269 const MCExpr *PICBase = MCSymbolRefExpr::Create(GetPICBaseSymbol(),
271 DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext);
272 Expr = MCBinaryExpr::CreateAdd(Expr, DotExpr, OutContext);
277 if (!MO.isJTI() && MO.getOffset())
278 Expr = MCBinaryExpr::CreateAdd(Expr, MCConstantExpr::Create(MO.getOffset(),
281 return MCOperand::CreateExpr(Expr);
286 static void lower_subreg32(MCInst *MI, unsigned OpNo) {
287 // Convert registers in the addr mode according to subreg32.
288 unsigned Reg = MI->getOperand(OpNo).getReg();
290 MI->getOperand(OpNo).setReg(getX86SubSuperRegister(Reg, MVT::i32));
293 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
294 // Convert registers in the addr mode according to subreg64.
295 for (unsigned i = 0; i != 4; ++i) {
296 if (!MI->getOperand(OpNo+i).isReg()) continue;
298 unsigned Reg = MI->getOperand(OpNo+i).getReg();
299 if (Reg == 0) continue;
301 MI->getOperand(OpNo+i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
306 void X86ATTAsmPrinter::
307 printInstructionThroughMCStreamer(const MachineInstr *MI) {
309 switch (MI->getOpcode()) {
310 case TargetInstrInfo::DBG_LABEL:
311 case TargetInstrInfo::EH_LABEL:
312 case TargetInstrInfo::GC_LABEL:
315 case TargetInstrInfo::INLINEASM:
319 case TargetInstrInfo::IMPLICIT_DEF:
320 printImplicitDef(MI);
322 case X86::MOVPC32r: {
323 // This is a pseudo op for a two instruction sequence with a label, which
330 MCSymbol *PICBase = GetPICBaseSymbol();
331 TmpInst.setOpcode(X86::CALLpcrel32);
332 // FIXME: We would like an efficient form for this, so we don't have to do a
333 // lot of extra uniquing.
334 TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
336 printInstruction(&TmpInst);
340 OutStreamer.EmitLabel(PICBase);
343 TmpInst.setOpcode(X86::POP32r);
344 TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
345 printInstruction(&TmpInst);
350 TmpInst.setOpcode(MI->getOpcode());
352 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
353 const MachineOperand &MO = MI->getOperand(i);
356 switch (MO.getType()) {
359 errs() << "Cannot lower operand #" << i << " of :" << *MI;
360 llvm_unreachable("Unimp");
361 case MachineOperand::MO_Register:
362 MCOp = MCOperand::CreateReg(MO.getReg());
364 case MachineOperand::MO_Immediate:
365 MCOp = MCOperand::CreateImm(MO.getImm());
367 case MachineOperand::MO_MachineBasicBlock:
368 MCOp = MCOperand::CreateMBBLabel(getFunctionNumber(),
369 MO.getMBB()->getNumber());
371 case MachineOperand::MO_GlobalAddress:
372 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
374 case MachineOperand::MO_ExternalSymbol:
375 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
377 case MachineOperand::MO_JumpTableIndex:
378 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
380 case MachineOperand::MO_ConstantPoolIndex:
381 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
385 TmpInst.addOperand(MCOp);
388 // Handle a few special cases to eliminate operand modifiers.
389 switch (TmpInst.getOpcode()) {
390 case X86::LEA64_32r: // Handle 'subreg rewriting' for the lea64_32mem operand.
391 lower_lea64_32mem(&TmpInst, 1);
394 TmpInst.setOpcode(X86::MOV32r0);
395 lower_subreg32(&TmpInst, 0);
397 case X86::MOVZX16rr8:
398 TmpInst.setOpcode(X86::MOVZX32rr8);
399 lower_subreg32(&TmpInst, 0);
401 case X86::MOVZX16rm8:
402 TmpInst.setOpcode(X86::MOVZX32rm8);
403 lower_subreg32(&TmpInst, 0);
405 case X86::MOVSX16rr8:
406 TmpInst.setOpcode(X86::MOVSX32rr8);
407 lower_subreg32(&TmpInst, 0);
409 case X86::MOVSX16rm8:
410 TmpInst.setOpcode(X86::MOVSX32rm8);
411 lower_subreg32(&TmpInst, 0);
413 case X86::MOVZX64rr32:
414 TmpInst.setOpcode(X86::MOV32rr);
415 lower_subreg32(&TmpInst, 0);
417 case X86::MOVZX64rm32:
418 TmpInst.setOpcode(X86::MOV32rm);
419 lower_subreg32(&TmpInst, 0);
421 case X86::MOV64ri64i32:
422 TmpInst.setOpcode(X86::MOV32ri);
423 lower_subreg32(&TmpInst, 0);
425 case X86::MOVZX64rr8:
426 TmpInst.setOpcode(X86::MOVZX32rr8);
427 lower_subreg32(&TmpInst, 0);
429 case X86::MOVZX64rm8:
430 TmpInst.setOpcode(X86::MOVZX32rm8);
431 lower_subreg32(&TmpInst, 0);
433 case X86::MOVZX64rr16:
434 TmpInst.setOpcode(X86::MOVZX32rr16);
435 lower_subreg32(&TmpInst, 0);
437 case X86::MOVZX64rm16:
438 TmpInst.setOpcode(X86::MOVZX32rm16);
439 lower_subreg32(&TmpInst, 0);
443 printInstruction(&TmpInst);