1 //===-- X86IntelAsmPrinter.cpp - Convert X86 LLVM code to Intel assembly --===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains a printer that converts from our internal representation
11 // of machine-dependent LLVM code to Intel format assembly language.
12 // This printer is the output mechanism used by `llc'.
14 //===----------------------------------------------------------------------===//
16 #include "X86IntelAsmPrinter.h"
18 #include "llvm/Constants.h"
19 #include "llvm/Module.h"
20 #include "llvm/Assembly/Writer.h"
21 #include "llvm/Support/Mangler.h"
22 #include "llvm/Target/TargetOptions.h"
25 X86IntelAsmPrinter::X86IntelAsmPrinter(std::ostream &O, X86TargetMachine &TM)
26 : X86SharedAsmPrinter(O, TM) {
29 PrivateGlobalPrefix = "$";
30 AlignDirective = "\talign\t";
31 ZeroDirective = "\tdb\t";
32 ZeroDirectiveSuffix = " dup(0)";
33 AsciiDirective = "\tdb\t";
35 Data8bitsDirective = "\t.db\t";
36 Data16bitsDirective = "\t.dw\t";
37 Data32bitsDirective = "\t.dd\t";
38 Data64bitsDirective = "\t.dq\t";
39 HasDotTypeDotSizeDirective = false;
42 /// runOnMachineFunction - This uses the printMachineInstruction()
43 /// method to print assembly for each instruction.
45 bool X86IntelAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
47 // Let PassManager know we need debug information and relay
48 // the MachineDebugInfo address on to DwarfWriter.
49 DW.SetDebugInfo(&getAnalysis<MachineDebugInfo>());
52 SetupMachineFunction(MF);
55 // Print out constants referenced by the function
56 EmitConstantPool(MF.getConstantPool());
58 // Print out labels for the function.
59 SwitchSection(".code", MF.getFunction());
61 if (MF.getFunction()->getLinkage() == GlobalValue::ExternalLinkage)
62 O << "\tpublic " << CurrentFnName << "\n";
63 O << CurrentFnName << "\tproc near\n";
66 // Emit pre-function debug information.
67 DW.BeginFunction(&MF);
70 // Print out code for the function.
71 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
73 // Print a label for the basic block if there are any predecessors.
74 if (I->pred_begin() != I->pred_end())
75 O << PrivateGlobalPrefix << "BB" << CurrentFnName << "_" << I->getNumber()
77 << CommentString << " " << I->getBasicBlock()->getName() << "\n";
78 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
80 // Print the assembly for the instruction.
82 printMachineInstruction(II);
87 // Emit post-function debug information.
91 O << CurrentFnName << "\tendp\n";
93 // We didn't modify anything.
97 void X86IntelAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
98 unsigned char value = MI->getOperand(Op).getImmedValue();
99 assert(value <= 7 && "Invalid ssecc argument!");
101 case 0: O << "eq"; break;
102 case 1: O << "lt"; break;
103 case 2: O << "le"; break;
104 case 3: O << "unord"; break;
105 case 4: O << "neq"; break;
106 case 5: O << "nlt"; break;
107 case 6: O << "nle"; break;
108 case 7: O << "ord"; break;
112 void X86IntelAsmPrinter::printOp(const MachineOperand &MO,
113 const char *Modifier) {
114 const MRegisterInfo &RI = *TM.getRegisterInfo();
115 switch (MO.getType()) {
116 case MachineOperand::MO_VirtualRegister:
117 if (Value *V = MO.getVRegValueOrNull()) {
118 O << "<" << V->getName() << ">";
122 case MachineOperand::MO_MachineRegister:
123 if (MRegisterInfo::isPhysicalRegister(MO.getReg()))
124 O << RI.get(MO.getReg()).Name;
126 O << "reg" << MO.getReg();
129 case MachineOperand::MO_SignExtendedImmed:
130 case MachineOperand::MO_UnextendedImmed:
131 O << (int)MO.getImmedValue();
133 case MachineOperand::MO_MachineBasicBlock:
134 printBasicBlockLabel(MO.getMachineBasicBlock());
136 case MachineOperand::MO_PCRelativeDisp:
137 assert(0 && "Shouldn't use addPCDisp() when building X86 MachineInstrs");
140 case MachineOperand::MO_ConstantPoolIndex: {
141 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
142 if (!isMemOp) O << "OFFSET ";
143 O << "[" << PrivateGlobalPrefix << "CPI" << getFunctionNumber() << "_"
144 << MO.getConstantPoolIndex();
145 if (forDarwin && TM.getRelocationModel() == Reloc::PIC)
146 O << "-\"L" << getFunctionNumber() << "$pb\"";
147 int Offset = MO.getOffset();
149 O << " + " << Offset;
155 case MachineOperand::MO_GlobalAddress: {
156 bool isCallOp = Modifier && !strcmp(Modifier, "call");
157 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
158 if (!isMemOp && !isCallOp) O << "OFFSET ";
159 if (forDarwin && TM.getRelocationModel() != Reloc::Static) {
160 GlobalValue *GV = MO.getGlobal();
161 std::string Name = Mang->getValueName(GV);
162 if (!isMemOp && !isCallOp) O << '$';
163 // Link-once, External, or Weakly-linked global variables need
164 // non-lazily-resolved stubs
165 if (GV->isExternal() || GV->hasWeakLinkage() ||
166 GV->hasLinkOnceLinkage()) {
167 // Dynamically-resolved functions need a stub for the function.
168 if (isCallOp && isa<Function>(GV) && cast<Function>(GV)->isExternal()) {
169 FnStubs.insert(Name);
170 O << "L" << Name << "$stub";
172 GVStubs.insert(Name);
173 O << "L" << Name << "$non_lazy_ptr";
176 O << Mang->getValueName(GV);
178 if (!isCallOp && TM.getRelocationModel() == Reloc::PIC)
179 O << "-\"L" << getFunctionNumber() << "$pb\"";
181 O << Mang->getValueName(MO.getGlobal());
182 int Offset = MO.getOffset();
184 O << " + " << Offset;
189 case MachineOperand::MO_ExternalSymbol: {
190 bool isCallOp = Modifier && !strcmp(Modifier, "call");
191 if (isCallOp && forDarwin && TM.getRelocationModel() != Reloc::Static) {
192 std::string Name(GlobalPrefix);
193 Name += MO.getSymbolName();
194 FnStubs.insert(Name);
195 O << "L" << Name << "$stub";
198 if (!isCallOp) O << "OFFSET ";
199 O << GlobalPrefix << MO.getSymbolName();
203 O << "<unknown operand type>"; return;
207 void X86IntelAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op){
208 assert(isMem(MI, Op) && "Invalid memory reference!");
210 const MachineOperand &BaseReg = MI->getOperand(Op);
211 int ScaleVal = MI->getOperand(Op+1).getImmedValue();
212 const MachineOperand &IndexReg = MI->getOperand(Op+2);
213 const MachineOperand &DispSpec = MI->getOperand(Op+3);
215 if (BaseReg.isFrameIndex()) {
216 O << "[frame slot #" << BaseReg.getFrameIndex();
217 if (DispSpec.getImmedValue())
218 O << " + " << DispSpec.getImmedValue();
224 bool NeedPlus = false;
225 if (BaseReg.getReg()) {
226 printOp(BaseReg, "mem");
230 if (IndexReg.getReg()) {
231 if (NeedPlus) O << " + ";
233 O << ScaleVal << "*";
238 if (DispSpec.isGlobalAddress() || DispSpec.isConstantPoolIndex()) {
241 printOp(DispSpec, "mem");
243 int DispVal = DispSpec.getImmedValue();
244 if (DispVal || (!BaseReg.getReg() && !IndexReg.getReg())) {
258 void X86IntelAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
259 O << "\"L" << getFunctionNumber() << "$pb\"\n";
260 O << "\"L" << getFunctionNumber() << "$pb\":";
263 bool X86IntelAsmPrinter::printAsmMRegister(const MachineOperand &MO,
265 const MRegisterInfo &RI = *TM.getRegisterInfo();
266 unsigned Reg = MO.getReg();
267 const char *Name = RI.get(Reg).Name;
269 default: return true; // Unknown mode.
270 case 'b': // Print QImode register
272 default: return true;
273 case X86::AH: case X86::AL: case X86::AX: case X86::EAX:
276 case X86::DH: case X86::DL: case X86::DX: case X86::EDX:
279 case X86::CH: case X86::CL: case X86::CX: case X86::ECX:
282 case X86::BH: case X86::BL: case X86::BX: case X86::EBX:
299 case 'h': // Print QImode high register
301 default: return true;
302 case X86::AH: case X86::AL: case X86::AX: case X86::EAX:
305 case X86::DH: case X86::DL: case X86::DX: case X86::EDX:
308 case X86::CH: case X86::CL: case X86::CX: case X86::ECX:
311 case X86::BH: case X86::BL: case X86::BX: case X86::EBX:
316 case 'w': // Print HImode register
318 default: return true;
319 case X86::AH: case X86::AL: case X86::AX: case X86::EAX:
322 case X86::DH: case X86::DL: case X86::DX: case X86::EDX:
325 case X86::CH: case X86::CL: case X86::CX: case X86::ECX:
328 case X86::BH: case X86::BL: case X86::BX: case X86::EBX:
345 case 'k': // Print SImode register
347 default: return true;
348 case X86::AH: case X86::AL: case X86::AX: case X86::EAX:
351 case X86::DH: case X86::DL: case X86::DX: case X86::EDX:
354 case X86::CH: case X86::CL: case X86::CX: case X86::ECX:
357 case X86::BH: case X86::BL: case X86::BX: case X86::EBX:
380 /// PrintAsmOperand - Print out an operand for an inline asm expression.
382 bool X86IntelAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
384 const char *ExtraCode) {
385 // Does this asm operand have a single letter operand modifier?
386 if (ExtraCode && ExtraCode[0]) {
387 if (ExtraCode[1] != 0) return true; // Unknown modifier.
389 switch (ExtraCode[0]) {
390 default: return true; // Unknown modifier.
391 case 'b': // Print QImode register
392 case 'h': // Print QImode high register
393 case 'w': // Print HImode register
394 case 'k': // Print SImode register
395 return printAsmMRegister(MI->getOperand(OpNo), ExtraCode[0]);
399 printOperand(MI, OpNo);
403 bool X86IntelAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
406 const char *ExtraCode) {
407 if (ExtraCode && ExtraCode[0])
408 return true; // Unknown modifier.
409 printMemReference(MI, OpNo);
413 /// printMachineInstruction -- Print out a single X86 LLVM instruction
414 /// MI in Intel syntax to the current output stream.
416 void X86IntelAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
419 // Call the autogenerated instruction printer routines.
420 printInstruction(MI);
423 bool X86IntelAsmPrinter::doInitialization(Module &M) {
424 X86SharedAsmPrinter::doInitialization(M);
425 Mang->markCharUnacceptable('.');
426 PrivateGlobalPrefix = "$"; // need this here too :(
427 O << "\t.686\n\t.model flat\n\n";
429 // Emit declarations for external functions.
430 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
432 O << "\textern " << Mang->getValueName(I) << ":near\n";
434 // Emit declarations for external globals.
435 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
438 O << "\textern " << Mang->getValueName(I) << ":byte\n";
444 bool X86IntelAsmPrinter::doFinalization(Module &M) {
445 X86SharedAsmPrinter::doFinalization(M);
446 if (CurrentSection != "")
447 O << CurrentSection << "\tends\n";
452 void X86IntelAsmPrinter::SwitchSection(const char *NewSection,
453 const GlobalValue *GV) {
454 if (*NewSection == 0)
458 bool isData = strcmp(NewSection , ".data") == 0;
460 if (GV && GV->hasSection())
461 NS = GV->getSection();
467 if (CurrentSection != NS) {
468 if (CurrentSection != "")
469 O << CurrentSection << "\tends\n";
471 O << CurrentSection << (isData ? "\tsegment 'DATA'\n"
472 : "\tsegment 'CODE'\n");
476 void X86IntelAsmPrinter::EmitString(const ConstantArray *CVA) const {
477 unsigned NumElts = CVA->getNumOperands();
479 // ML does not have escape sequences except '' for '. It also has a maximum
480 // string length of 255.
482 bool inString = false;
483 for (unsigned i = 0; i < NumElts; i++) {
484 int n = cast<ConstantInt>(CVA->getOperand(i))->getRawValue() & 255;
488 if (n >= 32 && n <= 127) {
515 len += 1 + (n > 9) + (n > 99);
536 // Include the auto-generated portion of the assembly writer.
537 #include "X86GenAsmWriter1.inc"