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"
17 #include "X86TargetAsmInfo.h"
19 #include "llvm/CallingConv.h"
20 #include "llvm/Constants.h"
21 #include "llvm/Module.h"
22 #include "llvm/Assembly/Writer.h"
23 #include "llvm/Support/Mangler.h"
24 #include "llvm/Target/TargetAsmInfo.h"
25 #include "llvm/Target/TargetOptions.h"
28 std::string X86IntelAsmPrinter::getSectionForFunction(const Function &F) const {
29 // Intel asm always emits functions to _text.
33 /// runOnMachineFunction - This uses the printMachineInstruction()
34 /// method to print assembly for each instruction.
36 bool X86IntelAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
37 SetupMachineFunction(MF);
40 // Print out constants referenced by the function
41 EmitConstantPool(MF.getConstantPool());
43 // Print out labels for the function.
44 const Function *F = MF.getFunction();
45 unsigned CC = F->getCallingConv();
47 // Populate function information map. Actually, We don't want to populate
48 // non-stdcall or non-fastcall functions' information right now.
49 if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
50 FunctionInfoMap[F] = *MF.getInfo<X86FunctionInfo>();
52 X86SharedAsmPrinter::decorateName(CurrentFnName, F);
54 SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
56 switch (F->getLinkage()) {
57 default: assert(0 && "Unsupported linkage type!");
58 case Function::InternalLinkage:
61 case Function::DLLExportLinkage:
62 DLLExportedFns.insert(CurrentFnName);
64 case Function::ExternalLinkage:
65 O << "\tpublic " << CurrentFnName << "\n";
70 O << CurrentFnName << "\tproc near\n";
72 // Print out code for the function.
73 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
75 // Print a label for the basic block if there are any predecessors.
76 if (I->pred_begin() != I->pred_end()) {
77 printBasicBlockLabel(I, true);
80 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
82 // Print the assembly for the instruction.
84 printMachineInstruction(II);
88 // Print out jump tables referenced by the function.
89 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
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_Register:
117 if (MRegisterInfo::isPhysicalRegister(MO.getReg())) {
118 unsigned Reg = MO.getReg();
119 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
120 MVT::ValueType VT = (strcmp(Modifier,"subreg64") == 0) ?
121 MVT::i64 : ((strcmp(Modifier, "subreg32") == 0) ? MVT::i32 :
122 ((strcmp(Modifier,"subreg16") == 0) ? MVT::i16 :MVT::i8));
123 Reg = getX86SubSuperRegister(Reg, VT);
125 O << RI.get(Reg).Name;
127 O << "reg" << MO.getReg();
130 case MachineOperand::MO_Immediate:
131 O << MO.getImmedValue();
133 case MachineOperand::MO_MachineBasicBlock:
134 printBasicBlockLabel(MO.getMachineBasicBlock());
136 case MachineOperand::MO_ConstantPoolIndex: {
137 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
138 if (!isMemOp) O << "OFFSET ";
139 O << "[" << TAI->getPrivateGlobalPrefix() << "CPI"
140 << getFunctionNumber() << "_" << MO.getConstantPoolIndex();
141 int Offset = MO.getOffset();
143 O << " + " << Offset;
149 case MachineOperand::MO_GlobalAddress: {
150 bool isCallOp = Modifier && !strcmp(Modifier, "call");
151 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
152 GlobalValue *GV = MO.getGlobal();
153 std::string Name = Mang->getValueName(GV);
155 X86SharedAsmPrinter::decorateName(Name, GV);
157 if (!isMemOp && !isCallOp) O << "OFFSET ";
158 if (GV->hasDLLImportLinkage()) {
159 // FIXME: This should be fixed with full support of stdcall & fastcall
164 int Offset = MO.getOffset();
166 O << " + " << Offset;
171 case MachineOperand::MO_ExternalSymbol: {
172 bool isCallOp = Modifier && !strcmp(Modifier, "call");
173 if (!isCallOp) O << "OFFSET ";
174 O << TAI->getGlobalPrefix() << MO.getSymbolName();
178 O << "<unknown operand type>"; return;
182 void X86IntelAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
183 const char *Modifier) {
184 assert(isMem(MI, Op) && "Invalid memory reference!");
186 const MachineOperand &BaseReg = MI->getOperand(Op);
187 int ScaleVal = MI->getOperand(Op+1).getImmedValue();
188 const MachineOperand &IndexReg = MI->getOperand(Op+2);
189 const MachineOperand &DispSpec = MI->getOperand(Op+3);
191 if (BaseReg.isFrameIndex()) {
192 O << "[frame slot #" << BaseReg.getFrameIndex();
193 if (DispSpec.getImmedValue())
194 O << " + " << DispSpec.getImmedValue();
200 bool NeedPlus = false;
201 if (BaseReg.getReg()) {
202 printOp(BaseReg, Modifier);
206 if (IndexReg.getReg()) {
207 if (NeedPlus) O << " + ";
209 O << ScaleVal << "*";
210 printOp(IndexReg, Modifier);
214 if (DispSpec.isGlobalAddress() || DispSpec.isConstantPoolIndex()) {
217 printOp(DispSpec, "mem");
219 int DispVal = DispSpec.getImmedValue();
220 if (DispVal || (!BaseReg.getReg() && !IndexReg.getReg())) {
234 void X86IntelAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
235 O << "\"L" << getFunctionNumber() << "$pb\"\n";
236 O << "\"L" << getFunctionNumber() << "$pb\":";
239 bool X86IntelAsmPrinter::printAsmMRegister(const MachineOperand &MO,
241 const MRegisterInfo &RI = *TM.getRegisterInfo();
242 unsigned Reg = MO.getReg();
244 default: return true; // Unknown mode.
245 case 'b': // Print QImode register
246 Reg = getX86SubSuperRegister(Reg, MVT::i8);
248 case 'h': // Print QImode high register
249 Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
251 case 'w': // Print HImode register
252 Reg = getX86SubSuperRegister(Reg, MVT::i16);
254 case 'k': // Print SImode register
255 Reg = getX86SubSuperRegister(Reg, MVT::i32);
259 O << '%' << RI.get(Reg).Name;
263 /// PrintAsmOperand - Print out an operand for an inline asm expression.
265 bool X86IntelAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
267 const char *ExtraCode) {
268 // Does this asm operand have a single letter operand modifier?
269 if (ExtraCode && ExtraCode[0]) {
270 if (ExtraCode[1] != 0) return true; // Unknown modifier.
272 switch (ExtraCode[0]) {
273 default: return true; // Unknown modifier.
274 case 'b': // Print QImode register
275 case 'h': // Print QImode high register
276 case 'w': // Print HImode register
277 case 'k': // Print SImode register
278 return printAsmMRegister(MI->getOperand(OpNo), ExtraCode[0]);
282 printOperand(MI, OpNo);
286 bool X86IntelAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
289 const char *ExtraCode) {
290 if (ExtraCode && ExtraCode[0])
291 return true; // Unknown modifier.
292 printMemReference(MI, OpNo);
296 /// printMachineInstruction -- Print out a single X86 LLVM instruction
297 /// MI in Intel syntax to the current output stream.
299 void X86IntelAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
302 // See if a truncate instruction can be turned into a nop.
303 switch (MI->getOpcode()) {
305 case X86::TRUNC_64to32:
306 case X86::TRUNC_64to16:
307 case X86::TRUNC_32to16:
308 case X86::TRUNC_32to8:
309 case X86::TRUNC_16to8:
310 case X86::TRUNC_32_to8:
311 case X86::TRUNC_16_to8: {
312 const MachineOperand &MO0 = MI->getOperand(0);
313 const MachineOperand &MO1 = MI->getOperand(1);
314 unsigned Reg0 = MO0.getReg();
315 unsigned Reg1 = MO1.getReg();
316 unsigned Opc = MI->getOpcode();
317 if (Opc == X86::TRUNC_64to32)
318 Reg1 = getX86SubSuperRegister(Reg1, MVT::i32);
319 else if (Opc == X86::TRUNC_32to16 || Opc == X86::TRUNC_64to16)
320 Reg1 = getX86SubSuperRegister(Reg1, MVT::i16);
322 Reg1 = getX86SubSuperRegister(Reg1, MVT::i8);
323 O << TAI->getCommentString() << " TRUNCATE ";
328 case X86::PsMOVZX64rr32:
329 O << TAI->getCommentString() << " ZERO-EXTEND " << "\n\t";
333 // Call the autogenerated instruction printer routines.
334 printInstruction(MI);
337 bool X86IntelAsmPrinter::doInitialization(Module &M) {
338 X86SharedAsmPrinter::doInitialization(M);
340 Mang->markCharUnacceptable('.');
342 O << "\t.686\n\t.model flat\n\n";
344 // Emit declarations for external functions.
345 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
346 if (I->isExternal()) {
347 std::string Name = Mang->getValueName(I);
348 X86SharedAsmPrinter::decorateName(Name, I);
351 if (I->hasDLLImportLinkage()) {
354 O << Name << ":near\n";
357 // Emit declarations for external globals. Note that VC++ always declares
358 // external globals to have type byte, and if that's good enough for VC++...
359 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
361 if (I->isExternal()) {
362 std::string Name = Mang->getValueName(I);
365 if (I->hasDLLImportLinkage()) {
368 O << Name << ":byte\n";
375 bool X86IntelAsmPrinter::doFinalization(Module &M) {
376 const TargetData *TD = TM.getTargetData();
378 // Print out module-level global variables here.
379 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
381 if (I->isExternal()) continue; // External global require no code
383 // Check to see if this is a special global used by LLVM, if so, emit it.
384 if (EmitSpecialLLVMGlobal(I))
387 std::string name = Mang->getValueName(I);
388 Constant *C = I->getInitializer();
389 unsigned Size = TD->getTypeSize(C->getType());
390 unsigned Align = getPreferredAlignmentLog(I);
391 bool bCustomSegment = false;
393 switch (I->getLinkage()) {
394 case GlobalValue::LinkOnceLinkage:
395 case GlobalValue::WeakLinkage:
396 SwitchToDataSection("", 0);
397 O << name << "?\tsegment common 'COMMON'\n";
398 bCustomSegment = true;
399 // FIXME: the default alignment is 16 bytes, but 1, 2, 4, and 256
400 // are also available.
402 case GlobalValue::AppendingLinkage:
403 SwitchToDataSection("", 0);
404 O << name << "?\tsegment public 'DATA'\n";
405 bCustomSegment = true;
406 // FIXME: the default alignment is 16 bytes, but 1, 2, 4, and 256
407 // are also available.
409 case GlobalValue::DLLExportLinkage:
410 DLLExportedGVs.insert(name);
412 case GlobalValue::ExternalLinkage:
413 O << "\tpublic " << name << "\n";
415 case GlobalValue::InternalLinkage:
416 SwitchToDataSection(TAI->getDataSection(), I);
419 assert(0 && "Unknown linkage type!");
423 EmitAlignment(Align, I);
425 O << name << ":\t\t\t\t" << TAI->getCommentString()
426 << " " << I->getName() << '\n';
428 EmitGlobalConstant(C);
431 O << name << "?\tends\n";
434 // Output linker support code for dllexported globals
435 if ((DLLExportedGVs.begin() != DLLExportedGVs.end()) ||
436 (DLLExportedFns.begin() != DLLExportedFns.end())) {
437 SwitchToDataSection("", 0);
438 O << "; WARNING: The following code is valid only with MASM v8.x and (possible) higher\n"
439 << "; This version of MASM is usually shipped with Microsoft Visual Studio 2005\n"
440 << "; or (possible) further versions. Unfortunately, there is no way to support\n"
441 << "; dllexported symbols in the earlier versions of MASM in fully automatic way\n\n";
442 O << "_drectve\t segment info alias('.drectve')\n";
445 for (std::set<std::string>::iterator i = DLLExportedGVs.begin(),
446 e = DLLExportedGVs.end();
448 O << "\t db ' /EXPORT:" << *i << ",data'\n";
451 for (std::set<std::string>::iterator i = DLLExportedFns.begin(),
452 e = DLLExportedFns.end();
454 O << "\t db ' /EXPORT:" << *i << "'\n";
457 if ((DLLExportedGVs.begin() != DLLExportedGVs.end()) ||
458 (DLLExportedFns.begin() != DLLExportedFns.end())) {
459 O << "_drectve\t ends\n";
462 // Bypass X86SharedAsmPrinter::doFinalization().
463 AsmPrinter::doFinalization(M);
464 SwitchToDataSection("", 0);
466 return false; // success
469 void X86IntelAsmPrinter::EmitString(const ConstantArray *CVA) const {
470 unsigned NumElts = CVA->getNumOperands();
472 // ML does not have escape sequences except '' for '. It also has a maximum
473 // string length of 255.
475 bool inString = false;
476 for (unsigned i = 0; i < NumElts; i++) {
477 int n = cast<ConstantInt>(CVA->getOperand(i))->getRawValue() & 255;
481 if (n >= 32 && n <= 127) {
508 len += 1 + (n > 9) + (n > 99);
529 // Include the auto-generated portion of the assembly writer.
530 #include "X86GenAsmWriter1.inc"