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()<<".$piclabel";
38 return OutContext.GetOrCreateSymbol(Name.str());
42 /// LowerGlobalAddressOperand - Lower an MO_GlobalAddress operand to an
44 MCSymbol *X86ATTAsmPrinter::GetGlobalAddressSymbol(const MachineOperand &MO) {
45 const GlobalValue *GV = MO.getGlobal();
47 const char *Suffix = "";
48 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
50 else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
51 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
52 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
53 Suffix = "$non_lazy_ptr";
55 std::string Name = Mang->getMangledName(GV, Suffix, Suffix[0] != '\0');
56 if (Subtarget->isTargetCygMing())
57 DecorateCygMingName(Name, GV);
59 switch (MO.getTargetFlags()) {
60 default: llvm_unreachable("Unknown target flag on GV operand");
61 case X86II::MO_NO_FLAG: // No flag.
62 case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name.
63 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
65 case X86II::MO_DLLIMPORT:
66 // Handle dllimport linkage.
67 Name = "__imp_" + Name;
69 case X86II::MO_DARWIN_NONLAZY:
70 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
71 GVStubs[Name] = Mang->getMangledName(GV);
73 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
74 HiddenGVStubs[Name] = Mang->getMangledName(GV);
76 case X86II::MO_DARWIN_STUB:
77 FnStubs[Name] = Mang->getMangledName(GV);
79 // FIXME: These probably should be a modifier on the symbol or something??
80 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
81 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
82 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
83 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
84 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
85 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
86 case X86II::MO_GOT: Name += "@GOT"; break;
87 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
88 case X86II::MO_PLT: Name += "@PLT"; break;
91 return OutContext.GetOrCreateSymbol(Name);
94 MCSymbol *X86ATTAsmPrinter::GetExternalSymbolSymbol(const MachineOperand &MO) {
95 SmallString<256> Name;
96 Name += MAI->getGlobalPrefix();
97 Name += MO.getSymbolName();
99 switch (MO.getTargetFlags()) {
100 default: llvm_unreachable("Unknown target flag on GV operand");
101 case X86II::MO_NO_FLAG: // No flag.
102 case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name.
103 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
105 case X86II::MO_DLLIMPORT: {
106 // Handle dllimport linkage.
107 const char *Prefix = "__imp_";
108 Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
111 case X86II::MO_DARWIN_STUB:
112 // Insert: FnStub["_foo$stub"] = "_foo";
114 FnStubs[Name.str()] = StringRef(Name.data(), Name.size()-5);
116 // FIXME: These probably should be a modifier on the symbol or something??
117 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
118 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
119 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
120 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
121 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
122 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
123 case X86II::MO_GOT: Name += "@GOT"; break;
124 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
125 case X86II::MO_PLT: Name += "@PLT"; break;
128 return OutContext.GetOrCreateSymbol(Name.str());
131 MCSymbol *X86ATTAsmPrinter::GetJumpTableSymbol(const MachineOperand &MO) {
132 SmallString<256> Name;
133 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "JTI"
134 << getFunctionNumber() << '_' << MO.getIndex();
136 switch (MO.getTargetFlags()) {
138 llvm_unreachable("Unknown target flag on GV operand");
139 case X86II::MO_NO_FLAG: // No flag.
140 case X86II::MO_PIC_BASE_OFFSET:
141 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
142 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
144 // FIXME: These probably should be a modifier on the symbol or something??
145 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
146 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
147 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
148 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
149 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
150 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
151 case X86II::MO_GOT: Name += "@GOT"; break;
152 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
153 case X86II::MO_PLT: Name += "@PLT"; break;
156 // Create a symbol for the name.
157 return OutContext.GetOrCreateSymbol(Name.str());
161 MCSymbol *X86ATTAsmPrinter::
162 GetConstantPoolIndexSymbol(const MachineOperand &MO) {
163 SmallString<256> Name;
164 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI"
165 << getFunctionNumber() << '_' << MO.getIndex();
167 switch (MO.getTargetFlags()) {
169 llvm_unreachable("Unknown target flag on GV operand");
170 case X86II::MO_NO_FLAG: // No flag.
171 case X86II::MO_PIC_BASE_OFFSET:
172 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
173 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
175 // FIXME: These probably should be a modifier on the symbol or something??
176 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
177 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
178 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
179 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
180 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
181 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
182 case X86II::MO_GOT: Name += "@GOT"; break;
183 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
184 case X86II::MO_PLT: Name += "@PLT"; break;
187 // Create a symbol for the name.
188 return OutContext.GetOrCreateSymbol(Name.str());
191 MCOperand X86ATTAsmPrinter::LowerSymbolOperand(const MachineOperand &MO,
193 // FIXME: We would like an efficient form for this, so we don't have to do a
194 // lot of extra uniquing.
195 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, OutContext);
197 switch (MO.getTargetFlags()) {
198 default: llvm_unreachable("Unknown target flag on GV operand");
199 case X86II::MO_NO_FLAG: // No flag.
201 // These affect the name of the symbol, not any suffix.
202 case X86II::MO_DARWIN_NONLAZY:
203 case X86II::MO_DLLIMPORT:
204 case X86II::MO_DARWIN_STUB:
205 case X86II::MO_TLSGD:
206 case X86II::MO_GOTTPOFF:
207 case X86II::MO_INDNTPOFF:
208 case X86II::MO_TPOFF:
209 case X86II::MO_NTPOFF:
210 case X86II::MO_GOTPCREL:
212 case X86II::MO_GOTOFF:
215 case X86II::MO_PIC_BASE_OFFSET:
216 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
217 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
218 // Subtract the pic base.
219 Expr = MCBinaryExpr::CreateSub(Expr,
220 MCSymbolRefExpr::Create(GetPICBaseSymbol(),
224 case X86II::MO_GOT_ABSOLUTE_ADDRESS: {
225 // For this, we want to print something like:
226 // MYSYMBOL + (. - PICBASE)
227 // However, we can't generate a ".", so just emit a new label here and refer
228 // to it. We know that this operand flag occurs at most once per function.
229 SmallString<64> Name;
230 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "picbaseref"
231 << getFunctionNumber();
232 MCSymbol *DotSym = OutContext.GetOrCreateSymbol(Name.str());
233 OutStreamer.EmitLabel(DotSym);
235 const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext);
236 const MCExpr *PICBase = MCSymbolRefExpr::Create(GetPICBaseSymbol(),
238 DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext);
239 Expr = MCBinaryExpr::CreateAdd(Expr, DotExpr, OutContext);
244 if (!MO.isJTI() && MO.getOffset())
245 Expr = MCBinaryExpr::CreateAdd(Expr, MCConstantExpr::Create(MO.getOffset(),
248 return MCOperand::CreateExpr(Expr);
253 static void lower_subreg32(MCInst *MI, unsigned OpNo) {
254 // Convert registers in the addr mode according to subreg32.
255 unsigned Reg = MI->getOperand(OpNo).getReg();
257 MI->getOperand(OpNo).setReg(getX86SubSuperRegister(Reg, MVT::i32));
260 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
261 // Convert registers in the addr mode according to subreg64.
262 for (unsigned i = 0; i != 4; ++i) {
263 if (!MI->getOperand(OpNo+i).isReg()) continue;
265 unsigned Reg = MI->getOperand(OpNo+i).getReg();
266 if (Reg == 0) continue;
268 MI->getOperand(OpNo+i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
273 void X86ATTAsmPrinter::
274 printInstructionThroughMCStreamer(const MachineInstr *MI) {
276 switch (MI->getOpcode()) {
277 case TargetInstrInfo::DBG_LABEL:
278 case TargetInstrInfo::EH_LABEL:
279 case TargetInstrInfo::GC_LABEL:
282 case TargetInstrInfo::INLINEASM:
286 case TargetInstrInfo::IMPLICIT_DEF:
287 printImplicitDef(MI);
289 case X86::MOVPC32r: {
290 // This is a pseudo op for a two instruction sequence with a label, which
297 MCSymbol *PICBase = GetPICBaseSymbol();
298 TmpInst.setOpcode(X86::CALLpcrel32);
299 // FIXME: We would like an efficient form for this, so we don't have to do a
300 // lot of extra uniquing.
301 TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
303 printInstruction(&TmpInst);
306 OutStreamer.EmitLabel(PICBase);
309 TmpInst.setOpcode(X86::POP32r);
310 TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
311 printInstruction(&TmpInst);
316 TmpInst.setOpcode(MI->getOpcode());
318 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
319 const MachineOperand &MO = MI->getOperand(i);
322 switch (MO.getType()) {
325 errs() << "Cannot lower operand #" << i << " of :" << *MI;
326 llvm_unreachable("Unimp");
327 case MachineOperand::MO_Register:
328 MCOp = MCOperand::CreateReg(MO.getReg());
330 case MachineOperand::MO_Immediate:
331 MCOp = MCOperand::CreateImm(MO.getImm());
333 case MachineOperand::MO_MachineBasicBlock:
334 MCOp = MCOperand::CreateMBBLabel(getFunctionNumber(),
335 MO.getMBB()->getNumber());
337 case MachineOperand::MO_GlobalAddress:
338 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
340 case MachineOperand::MO_ExternalSymbol:
341 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
343 case MachineOperand::MO_JumpTableIndex:
344 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
346 case MachineOperand::MO_ConstantPoolIndex:
347 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
351 TmpInst.addOperand(MCOp);
354 // Handle a few special cases to eliminate operand modifiers.
355 switch (TmpInst.getOpcode()) {
356 case X86::LEA64_32r: // Handle 'subreg rewriting' for the lea64_32mem operand.
357 lower_lea64_32mem(&TmpInst, 1);
360 TmpInst.setOpcode(X86::MOV32r0);
361 lower_subreg32(&TmpInst, 0);
363 case X86::MOVZX16rr8:
364 TmpInst.setOpcode(X86::MOVZX32rr8);
365 lower_subreg32(&TmpInst, 0);
367 case X86::MOVZX16rm8:
368 TmpInst.setOpcode(X86::MOVZX32rm8);
369 lower_subreg32(&TmpInst, 0);
371 case X86::MOVSX16rr8:
372 TmpInst.setOpcode(X86::MOVSX32rr8);
373 lower_subreg32(&TmpInst, 0);
375 case X86::MOVSX16rm8:
376 TmpInst.setOpcode(X86::MOVSX32rm8);
377 lower_subreg32(&TmpInst, 0);
379 case X86::MOVZX64rr32:
380 TmpInst.setOpcode(X86::MOV32rr);
381 lower_subreg32(&TmpInst, 0);
383 case X86::MOVZX64rm32:
384 TmpInst.setOpcode(X86::MOV32rm);
385 lower_subreg32(&TmpInst, 0);
387 case X86::MOV64ri64i32:
388 TmpInst.setOpcode(X86::MOV32ri);
389 lower_subreg32(&TmpInst, 0);
391 case X86::MOVZX64rr8:
392 TmpInst.setOpcode(X86::MOVZX32rr8);
393 lower_subreg32(&TmpInst, 0);
395 case X86::MOVZX64rm8:
396 TmpInst.setOpcode(X86::MOVZX32rm8);
397 lower_subreg32(&TmpInst, 0);
399 case X86::MOVZX64rr16:
400 TmpInst.setOpcode(X86::MOVZX32rr16);
401 lower_subreg32(&TmpInst, 0);
403 case X86::MOVZX64rm16:
404 TmpInst.setOpcode(X86::MOVZX32rm16);
405 lower_subreg32(&TmpInst, 0);
409 printInstruction(&TmpInst);