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()<<".$piclabel";
38 return OutContext.GetOrCreateSymbol(Name.str());
43 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
44 // Convert registers in the addr mode according to subreg64.
45 for (unsigned i = 0; i != 4; ++i) {
46 if (!MI->getOperand(i).isReg()) continue;
48 unsigned Reg = MI->getOperand(i).getReg();
49 if (Reg == 0) continue;
51 MI->getOperand(i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
55 /// LowerGlobalAddressOperand - Lower an MO_GlobalAddress operand to an
57 MCSymbol *X86ATTAsmPrinter::GetGlobalAddressSymbol(const MachineOperand &MO) {
58 const GlobalValue *GV = MO.getGlobal();
60 const char *Suffix = "";
61 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
63 else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
64 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
65 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
66 Suffix = "$non_lazy_ptr";
68 std::string Name = Mang->getMangledName(GV, Suffix, Suffix[0] != '\0');
69 if (Subtarget->isTargetCygMing())
70 DecorateCygMingName(Name, GV);
72 switch (MO.getTargetFlags()) {
73 default: llvm_unreachable("Unknown target flag on GV operand");
74 case X86II::MO_NO_FLAG: // No flag.
75 case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name.
76 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
78 case X86II::MO_DLLIMPORT:
79 // Handle dllimport linkage.
80 Name = "__imp_" + Name;
82 case X86II::MO_DARWIN_NONLAZY:
83 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
84 GVStubs[Name] = Mang->getMangledName(GV);
86 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
87 HiddenGVStubs[Name] = Mang->getMangledName(GV);
89 case X86II::MO_DARWIN_STUB:
90 FnStubs[Name] = Mang->getMangledName(GV);
92 // FIXME: These probably should be a modifier on the symbol or something??
93 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
94 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
95 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
96 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
97 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
98 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
99 case X86II::MO_GOT: Name += "@GOT"; break;
100 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
101 case X86II::MO_PLT: Name += "@PLT"; break;
104 return OutContext.GetOrCreateSymbol(Name);
107 MCSymbol *X86ATTAsmPrinter::GetExternalSymbolSymbol(const MachineOperand &MO) {
108 std::string Name = Mang->makeNameProper(MO.getSymbolName());
109 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
110 FnStubs[Name+"$stub"] = Name;
114 return OutContext.GetOrCreateSymbol(Name);
117 MCSymbol *X86ATTAsmPrinter::GetJumpTableSymbol(const MachineOperand &MO) {
118 SmallString<256> Name;
119 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "JTI"
120 << getFunctionNumber() << '_' << MO.getIndex();
122 MCSymbol *NegatedSymbol = 0;
123 switch (MO.getTargetFlags()) {
125 llvm_unreachable("Unknown target flag on GV operand");
126 case X86II::MO_NO_FLAG: // No flag.
127 case X86II::MO_PIC_BASE_OFFSET:
128 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
129 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
131 // Subtract the pic base.
132 NegatedSymbol = GetPICBaseSymbol();
136 // Create a symbol for the name.
137 return OutContext.GetOrCreateSymbol(Name.str());
141 MCSymbol *X86ATTAsmPrinter::
142 GetConstantPoolIndexSymbol(const MachineOperand &MO) {
143 SmallString<256> Name;
144 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI"
145 << getFunctionNumber() << '_' << MO.getIndex();
147 switch (MO.getTargetFlags()) {
149 llvm_unreachable("Unknown target flag on GV operand");
150 case X86II::MO_NO_FLAG: // No flag.
151 case X86II::MO_PIC_BASE_OFFSET:
152 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
153 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
157 // Create a symbol for the name.
158 return OutContext.GetOrCreateSymbol(Name.str());
161 MCOperand X86ATTAsmPrinter::LowerSymbolOperand(const MachineOperand &MO,
163 // FIXME: We would like an efficient form for this, so we don't have to do a
164 // lot of extra uniquing.
165 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, OutContext);
167 switch (MO.getTargetFlags()) {
168 default: llvm_unreachable("Unknown target flag on GV operand");
169 case X86II::MO_NO_FLAG: // No flag.
171 // These affect the name of the symbol, not any suffix.
172 case X86II::MO_DARWIN_NONLAZY:
173 case X86II::MO_DLLIMPORT:
174 case X86II::MO_DARWIN_STUB:
175 case X86II::MO_TLSGD:
176 case X86II::MO_GOTTPOFF:
177 case X86II::MO_INDNTPOFF:
178 case X86II::MO_TPOFF:
179 case X86II::MO_NTPOFF:
180 case X86II::MO_GOTPCREL:
182 case X86II::MO_GOTOFF:
185 case X86II::MO_PIC_BASE_OFFSET:
186 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
187 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
188 // Subtract the pic base.
189 Expr = MCBinaryExpr::CreateSub(Expr,
190 MCSymbolRefExpr::Create(GetPICBaseSymbol(),
194 case X86II::MO_GOT_ABSOLUTE_ADDRESS: {
195 // For this, we want to print something like:
196 // MYSYMBOL + (. - PICBASE)
197 // However, we can't generate a ".", so just emit a new label here and refer
198 // to it. We know that this operand flag occurs at most once per function.
199 SmallString<64> Name;
200 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "picbaseref"
201 << getFunctionNumber();
202 MCSymbol *DotSym = OutContext.GetOrCreateSymbol(Name.str());
203 OutStreamer.EmitLabel(DotSym);
205 const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext);
206 const MCExpr *PICBase = MCSymbolRefExpr::Create(GetPICBaseSymbol(),
208 DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext);
209 Expr = MCBinaryExpr::CreateAdd(Expr, DotExpr, OutContext);
214 if (!MO.isJTI() && MO.getOffset())
215 Expr = MCBinaryExpr::CreateAdd(Expr, MCConstantExpr::Create(MO.getOffset(),
218 return MCOperand::CreateExpr(Expr);
221 void X86ATTAsmPrinter::
222 printInstructionThroughMCStreamer(const MachineInstr *MI) {
226 switch (MI->getOpcode()) {
227 case TargetInstrInfo::DBG_LABEL:
228 case TargetInstrInfo::EH_LABEL:
229 case TargetInstrInfo::GC_LABEL:
232 case TargetInstrInfo::INLINEASM:
236 case TargetInstrInfo::IMPLICIT_DEF:
237 printImplicitDef(MI);
239 case X86::MOVPC32r: {
240 // This is a pseudo op for a two instruction sequence with a label, which
247 MCSymbol *PICBase = GetPICBaseSymbol();
248 TmpInst.setOpcode(X86::CALLpcrel32);
249 // FIXME: We would like an efficient form for this, so we don't have to do a
250 // lot of extra uniquing.
251 TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
253 printInstruction(&TmpInst);
256 OutStreamer.EmitLabel(PICBase);
259 TmpInst.setOpcode(X86::POP32r);
260 TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
261 printInstruction(&TmpInst);
266 TmpInst.setOpcode(MI->getOpcode());
268 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
269 const MachineOperand &MO = MI->getOperand(i);
272 switch (MO.getType()) {
275 errs() << "Cannot lower operand #" << i << " of :" << *MI;
276 llvm_unreachable("Unimp");
277 case MachineOperand::MO_Register:
278 MCOp = MCOperand::CreateReg(MO.getReg());
280 case MachineOperand::MO_Immediate:
281 MCOp = MCOperand::CreateImm(MO.getImm());
283 case MachineOperand::MO_MachineBasicBlock:
284 MCOp = MCOperand::CreateMBBLabel(getFunctionNumber(),
285 MO.getMBB()->getNumber());
287 case MachineOperand::MO_GlobalAddress:
288 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
290 case MachineOperand::MO_ExternalSymbol:
291 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
293 case MachineOperand::MO_JumpTableIndex:
294 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
296 case MachineOperand::MO_ConstantPoolIndex:
297 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
301 TmpInst.addOperand(MCOp);
304 switch (TmpInst.getOpcode()) {
306 // Handle the 'subreg rewriting' for the lea64_32mem operand.
307 lower_lea64_32mem(&TmpInst, 1);
311 printInstruction(&TmpInst);