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()<<".$piclabel";
38 return OutContext.GetOrCreateSymbol(Name.str());
42 static void lower_subreg32(MCInst *MI, unsigned OpNo) {
43 // Convert registers in the addr mode according to subreg32.
44 unsigned Reg = MI->getOperand(OpNo).getReg();
46 MI->getOperand(OpNo).setReg(getX86SubSuperRegister(Reg, MVT::i32));
50 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
51 // Convert registers in the addr mode according to subreg64.
52 for (unsigned i = 0; i != 4; ++i) {
53 if (!MI->getOperand(i).isReg()) continue;
55 unsigned Reg = MI->getOperand(i).getReg();
56 if (Reg == 0) continue;
58 MI->getOperand(i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
62 /// LowerGlobalAddressOperand - Lower an MO_GlobalAddress operand to an
64 MCSymbol *X86ATTAsmPrinter::GetGlobalAddressSymbol(const MachineOperand &MO) {
65 const GlobalValue *GV = MO.getGlobal();
67 const char *Suffix = "";
68 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
70 else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
71 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
72 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
73 Suffix = "$non_lazy_ptr";
75 std::string Name = Mang->getMangledName(GV, Suffix, Suffix[0] != '\0');
76 if (Subtarget->isTargetCygMing())
77 DecorateCygMingName(Name, GV);
79 switch (MO.getTargetFlags()) {
80 default: llvm_unreachable("Unknown target flag on GV operand");
81 case X86II::MO_NO_FLAG: // No flag.
82 case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name.
83 case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
85 case X86II::MO_DLLIMPORT:
86 // Handle dllimport linkage.
87 Name = "__imp_" + Name;
89 case X86II::MO_DARWIN_NONLAZY:
90 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
91 GVStubs[Name] = Mang->getMangledName(GV);
93 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
94 HiddenGVStubs[Name] = Mang->getMangledName(GV);
96 case X86II::MO_DARWIN_STUB:
97 FnStubs[Name] = Mang->getMangledName(GV);
99 // FIXME: These probably should be a modifier on the symbol or something??
100 case X86II::MO_TLSGD: Name += "@TLSGD"; break;
101 case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
102 case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
103 case X86II::MO_TPOFF: Name += "@TPOFF"; break;
104 case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
105 case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
106 case X86II::MO_GOT: Name += "@GOT"; break;
107 case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
108 case X86II::MO_PLT: Name += "@PLT"; break;
111 return OutContext.GetOrCreateSymbol(Name);
114 MCSymbol *X86ATTAsmPrinter::GetExternalSymbolSymbol(const MachineOperand &MO) {
115 std::string Name = Mang->makeNameProper(MO.getSymbolName());
116 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
117 FnStubs[Name+"$stub"] = Name;
121 return OutContext.GetOrCreateSymbol(Name);
124 MCSymbol *X86ATTAsmPrinter::GetJumpTableSymbol(const MachineOperand &MO) {
125 SmallString<256> Name;
126 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "JTI"
127 << getFunctionNumber() << '_' << MO.getIndex();
129 switch (MO.getTargetFlags()) {
131 llvm_unreachable("Unknown target flag on GV operand");
132 case X86II::MO_NO_FLAG: // No flag.
133 case X86II::MO_PIC_BASE_OFFSET:
134 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
135 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
139 // Create a symbol for the name.
140 return OutContext.GetOrCreateSymbol(Name.str());
144 MCSymbol *X86ATTAsmPrinter::
145 GetConstantPoolIndexSymbol(const MachineOperand &MO) {
146 SmallString<256> Name;
147 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI"
148 << getFunctionNumber() << '_' << MO.getIndex();
150 switch (MO.getTargetFlags()) {
152 llvm_unreachable("Unknown target flag on GV operand");
153 case X86II::MO_NO_FLAG: // No flag.
154 case X86II::MO_PIC_BASE_OFFSET:
155 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
156 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
160 // Create a symbol for the name.
161 return OutContext.GetOrCreateSymbol(Name.str());
164 MCOperand X86ATTAsmPrinter::LowerSymbolOperand(const MachineOperand &MO,
166 // FIXME: We would like an efficient form for this, so we don't have to do a
167 // lot of extra uniquing.
168 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, OutContext);
170 switch (MO.getTargetFlags()) {
171 default: llvm_unreachable("Unknown target flag on GV operand");
172 case X86II::MO_NO_FLAG: // No flag.
174 // These affect the name of the symbol, not any suffix.
175 case X86II::MO_DARWIN_NONLAZY:
176 case X86II::MO_DLLIMPORT:
177 case X86II::MO_DARWIN_STUB:
178 case X86II::MO_TLSGD:
179 case X86II::MO_GOTTPOFF:
180 case X86II::MO_INDNTPOFF:
181 case X86II::MO_TPOFF:
182 case X86II::MO_NTPOFF:
183 case X86II::MO_GOTPCREL:
185 case X86II::MO_GOTOFF:
188 case X86II::MO_PIC_BASE_OFFSET:
189 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
190 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
191 // Subtract the pic base.
192 Expr = MCBinaryExpr::CreateSub(Expr,
193 MCSymbolRefExpr::Create(GetPICBaseSymbol(),
197 case X86II::MO_GOT_ABSOLUTE_ADDRESS: {
198 // For this, we want to print something like:
199 // MYSYMBOL + (. - PICBASE)
200 // However, we can't generate a ".", so just emit a new label here and refer
201 // to it. We know that this operand flag occurs at most once per function.
202 SmallString<64> Name;
203 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "picbaseref"
204 << getFunctionNumber();
205 MCSymbol *DotSym = OutContext.GetOrCreateSymbol(Name.str());
206 OutStreamer.EmitLabel(DotSym);
208 const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext);
209 const MCExpr *PICBase = MCSymbolRefExpr::Create(GetPICBaseSymbol(),
211 DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext);
212 Expr = MCBinaryExpr::CreateAdd(Expr, DotExpr, OutContext);
217 if (!MO.isJTI() && MO.getOffset())
218 Expr = MCBinaryExpr::CreateAdd(Expr, MCConstantExpr::Create(MO.getOffset(),
221 return MCOperand::CreateExpr(Expr);
224 void X86ATTAsmPrinter::
225 printInstructionThroughMCStreamer(const MachineInstr *MI) {
229 switch (MI->getOpcode()) {
230 case TargetInstrInfo::DBG_LABEL:
231 case TargetInstrInfo::EH_LABEL:
232 case TargetInstrInfo::GC_LABEL:
235 case TargetInstrInfo::INLINEASM:
239 case TargetInstrInfo::IMPLICIT_DEF:
240 printImplicitDef(MI);
242 case X86::MOVPC32r: {
243 // This is a pseudo op for a two instruction sequence with a label, which
250 MCSymbol *PICBase = GetPICBaseSymbol();
251 TmpInst.setOpcode(X86::CALLpcrel32);
252 // FIXME: We would like an efficient form for this, so we don't have to do a
253 // lot of extra uniquing.
254 TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
256 printInstruction(&TmpInst);
259 OutStreamer.EmitLabel(PICBase);
262 TmpInst.setOpcode(X86::POP32r);
263 TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
264 printInstruction(&TmpInst);
269 TmpInst.setOpcode(MI->getOpcode());
271 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
272 const MachineOperand &MO = MI->getOperand(i);
275 switch (MO.getType()) {
278 errs() << "Cannot lower operand #" << i << " of :" << *MI;
279 llvm_unreachable("Unimp");
280 case MachineOperand::MO_Register:
281 MCOp = MCOperand::CreateReg(MO.getReg());
283 case MachineOperand::MO_Immediate:
284 MCOp = MCOperand::CreateImm(MO.getImm());
286 case MachineOperand::MO_MachineBasicBlock:
287 MCOp = MCOperand::CreateMBBLabel(getFunctionNumber(),
288 MO.getMBB()->getNumber());
290 case MachineOperand::MO_GlobalAddress:
291 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
293 case MachineOperand::MO_ExternalSymbol:
294 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
296 case MachineOperand::MO_JumpTableIndex:
297 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
299 case MachineOperand::MO_ConstantPoolIndex:
300 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
304 TmpInst.addOperand(MCOp);
307 switch (TmpInst.getOpcode()) {
309 // Handle the 'subreg rewriting' for the lea64_32mem operand.
310 lower_lea64_32mem(&TmpInst, 1);
314 TmpInst.setOpcode(X86::MOV32r0);
315 lower_subreg32(&TmpInst, 0);
319 printInstruction(&TmpInst);