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()<<".$piclabel";
38 return OutContext.GetOrCreateSymbol(Name.str());
43 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
44 // Convert registers in the addr mode according to subreg64.
45 for (unsigned i = 0; i != 4; ++i) {
46 if (!MI->getOperand(i).isReg()) continue;
48 unsigned Reg = MI->getOperand(i).getReg();
49 if (Reg == 0) continue;
51 MI->getOperand(i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
55 /// LowerGlobalAddressOperand - Lower an MO_GlobalAddress operand to an
57 MCSymbol *X86ATTAsmPrinter::GetGlobalAddressSymbol(const MachineOperand &MO) {
58 const GlobalValue *GV = MO.getGlobal();
60 const char *Suffix = "";
61 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
63 else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
64 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
65 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY ||
66 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
67 Suffix = "$non_lazy_ptr";
69 std::string Name = Mang->getMangledName(GV, Suffix, Suffix[0] != '\0');
70 if (Subtarget->isTargetCygMing())
71 DecorateCygMingName(Name, GV);
73 switch (MO.getTargetFlags()) {
74 default: llvm_unreachable("Unknown target flag on GV operand");
75 case X86II::MO_NO_FLAG: // No flag.
76 case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name.
77 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
79 case X86II::MO_DLLIMPORT:
80 // Handle dllimport linkage.
81 Name = "__imp_" + Name;
83 case X86II::MO_DARWIN_NONLAZY:
84 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
85 GVStubs[Name] = Mang->getMangledName(GV);
87 case X86II::MO_DARWIN_HIDDEN_NONLAZY:
88 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
89 HiddenGVStubs[Name] = Mang->getMangledName(GV);
91 case X86II::MO_DARWIN_STUB:
92 FnStubs[Name] = Mang->getMangledName(GV);
94 // FIXME: These probably should be a modifier on the symbol or something??
95 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
96 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
97 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
98 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
99 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
100 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
101 case X86II::MO_GOT: Name += "@GOT"; break;
102 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
103 case X86II::MO_PLT: Name += "@PLT"; break;
106 return OutContext.GetOrCreateSymbol(Name);
109 MCSymbol *X86ATTAsmPrinter::GetExternalSymbolSymbol(const MachineOperand &MO) {
110 std::string Name = Mang->makeNameProper(MO.getSymbolName());
111 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
112 FnStubs[Name+"$stub"] = Name;
116 return OutContext.GetOrCreateSymbol(Name);
119 MCSymbol *X86ATTAsmPrinter::GetJumpTableSymbol(const MachineOperand &MO) {
120 SmallString<256> Name;
121 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "JTI"
122 << getFunctionNumber() << '_' << MO.getIndex();
124 MCSymbol *NegatedSymbol = 0;
125 switch (MO.getTargetFlags()) {
127 llvm_unreachable("Unknown target flag on GV operand");
128 case X86II::MO_NO_FLAG: // No flag.
129 case X86II::MO_PIC_BASE_OFFSET:
130 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
131 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
133 // Subtract the pic base.
134 NegatedSymbol = GetPICBaseSymbol();
138 // Create a symbol for the name.
139 return OutContext.GetOrCreateSymbol(Name.str());
143 MCSymbol *X86ATTAsmPrinter::
144 GetConstantPoolIndexSymbol(const MachineOperand &MO) {
145 SmallString<256> Name;
146 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI"
147 << getFunctionNumber() << '_' << MO.getIndex();
149 switch (MO.getTargetFlags()) {
151 llvm_unreachable("Unknown target flag on GV operand");
152 case X86II::MO_NO_FLAG: // No flag.
153 case X86II::MO_PIC_BASE_OFFSET:
154 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
155 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
159 // Create a symbol for the name.
160 return OutContext.GetOrCreateSymbol(Name.str());
163 MCOperand X86ATTAsmPrinter::LowerSymbolOperand(const MachineOperand &MO,
165 MCSymbol *NegatedSymbol = 0;
166 switch (MO.getTargetFlags()) {
167 default: llvm_unreachable("Unknown target flag on GV operand");
168 case X86II::MO_NO_FLAG: // No flag.
170 // These affect the name of the symbol, not any suffix.
171 case X86II::MO_DARWIN_NONLAZY:
172 case X86II::MO_DARWIN_HIDDEN_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 NegatedSymbol = GetPICBaseSymbol();
191 case X86II::MO_GOT_ABSOLUTE_ADDRESS:
192 assert(0 && "Reloc mode unimp!");
194 //PrintPICBaseSymbol();
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 Expr = MCBinaryExpr::CreateSub(Expr, MCSymbolRefExpr::Create(NegatedSymbol,
206 if (!MO.isSymbol() && MO.getOffset())
207 Expr = MCBinaryExpr::CreateAdd(Expr, MCConstantExpr::Create(MO.getOffset(),
210 return MCOperand::CreateExpr(Expr);
213 void X86ATTAsmPrinter::
214 printInstructionThroughMCStreamer(const MachineInstr *MI) {
218 switch (MI->getOpcode()) {
219 case TargetInstrInfo::DBG_LABEL:
220 case TargetInstrInfo::EH_LABEL:
221 case TargetInstrInfo::GC_LABEL:
224 case TargetInstrInfo::INLINEASM:
228 case TargetInstrInfo::IMPLICIT_DEF:
229 printImplicitDef(MI);
231 case X86::MOVPC32r: {
232 // This is a pseudo op for a two instruction sequence with a label, which
239 MCSymbol *PICBase = GetPICBaseSymbol();
240 TmpInst.setOpcode(X86::CALLpcrel32);
241 // FIXME: We would like an efficient form for this, so we don't have to do a
242 // lot of extra uniquing.
243 TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
245 printInstruction(&TmpInst);
248 OutStreamer.EmitLabel(PICBase);
251 TmpInst.setOpcode(X86::POP32r);
252 TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
253 printInstruction(&TmpInst);
258 TmpInst.setOpcode(MI->getOpcode());
260 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
261 const MachineOperand &MO = MI->getOperand(i);
264 switch (MO.getType()) {
267 errs() << "Cannot lower operand #" << i << " of :" << *MI;
268 llvm_unreachable("Unimp");
269 case MachineOperand::MO_Register:
270 MCOp = MCOperand::CreateReg(MO.getReg());
272 case MachineOperand::MO_Immediate:
273 MCOp = MCOperand::CreateImm(MO.getImm());
275 case MachineOperand::MO_MachineBasicBlock:
276 MCOp = MCOperand::CreateMBBLabel(getFunctionNumber(),
277 MO.getMBB()->getNumber());
279 case MachineOperand::MO_GlobalAddress:
280 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
282 case MachineOperand::MO_ExternalSymbol:
283 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
285 case MachineOperand::MO_JumpTableIndex:
286 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
288 case MachineOperand::MO_ConstantPoolIndex:
289 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
293 TmpInst.addOperand(MCOp);
296 switch (TmpInst.getOpcode()) {
298 // Handle the 'subreg rewriting' for the lea64_32mem operand.
299 lower_lea64_32mem(&TmpInst, 1);
303 printInstruction(&TmpInst);