1 //===-- X86IntelAsmPrinter.cpp - Convert X86 LLVM code to Intel assembly --===//
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 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 #define DEBUG_TYPE "asm-printer"
17 #include "X86IntelAsmPrinter.h"
18 #include "X86InstrInfo.h"
19 #include "X86TargetAsmInfo.h"
21 #include "llvm/CallingConv.h"
22 #include "llvm/Constants.h"
23 #include "llvm/DerivedTypes.h"
24 #include "llvm/Module.h"
25 #include "llvm/ADT/Statistic.h"
26 #include "llvm/ADT/StringExtras.h"
27 #include "llvm/Assembly/Writer.h"
28 #include "llvm/CodeGen/DwarfWriter.h"
29 #include "llvm/Support/Mangler.h"
30 #include "llvm/Target/TargetAsmInfo.h"
31 #include "llvm/Target/TargetOptions.h"
34 STATISTIC(EmittedInsts, "Number of machine instrs printed");
36 static X86MachineFunctionInfo calculateFunctionInfo(const Function *F,
37 const TargetData *TD) {
38 X86MachineFunctionInfo Info;
41 switch (F->getCallingConv()) {
42 case CallingConv::X86_StdCall:
43 Info.setDecorationStyle(StdCall);
45 case CallingConv::X86_FastCall:
46 Info.setDecorationStyle(FastCall);
53 for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
54 AI != AE; ++AI, ++argNum) {
55 const Type* Ty = AI->getType();
57 // 'Dereference' type in case of byval parameter attribute
58 if (F->paramHasAttr(argNum, Attribute::ByVal))
59 Ty = cast<PointerType>(Ty)->getElementType();
61 // Size should be aligned to DWORD boundary
62 Size += ((TD->getTypeAllocSize(Ty) + 3)/4)*4;
65 // We're not supporting tooooo huge arguments :)
66 Info.setBytesToPopOnReturn((unsigned int)Size);
71 /// decorateName - Query FunctionInfoMap and use this information for various
73 void X86IntelAsmPrinter::decorateName(std::string &Name,
74 const GlobalValue *GV) {
75 const Function *F = dyn_cast<Function>(GV);
78 // We don't want to decorate non-stdcall or non-fastcall functions right now
79 unsigned CC = F->getCallingConv();
80 if (CC != CallingConv::X86_StdCall && CC != CallingConv::X86_FastCall)
83 FMFInfoMap::const_iterator info_item = FunctionInfoMap.find(F);
85 const X86MachineFunctionInfo *Info;
86 if (info_item == FunctionInfoMap.end()) {
87 // Calculate apropriate function info and populate map
88 FunctionInfoMap[F] = calculateFunctionInfo(F, TM.getTargetData());
89 Info = &FunctionInfoMap[F];
91 Info = &info_item->second;
94 const FunctionType *FT = F->getFunctionType();
95 switch (Info->getDecorationStyle()) {
99 // "Pure" variadic functions do not receive @0 suffix.
100 if (!FT->isVarArg() || (FT->getNumParams() == 0) ||
101 (FT->getNumParams() == 1 && F->hasStructRetAttr()))
102 Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
105 // "Pure" variadic functions do not receive @0 suffix.
106 if (!FT->isVarArg() || (FT->getNumParams() == 0) ||
107 (FT->getNumParams() == 1 && F->hasStructRetAttr()))
108 Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
117 assert(0 && "Unsupported DecorationStyle");
121 /// runOnMachineFunction - This uses the printMachineInstruction()
122 /// method to print assembly for each instruction.
124 bool X86IntelAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
126 SetupMachineFunction(MF);
129 // Print out constants referenced by the function
130 EmitConstantPool(MF.getConstantPool());
132 // Print out labels for the function.
133 const Function *F = MF.getFunction();
134 unsigned CC = F->getCallingConv();
135 unsigned FnAlign = MF.getAlignment();
137 // Populate function information map. Actually, We don't want to populate
138 // non-stdcall or non-fastcall functions' information right now.
139 if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
140 FunctionInfoMap[F] = *MF.getInfo<X86MachineFunctionInfo>();
142 decorateName(CurrentFnName, F);
144 SwitchToTextSection("_text", F);
145 switch (F->getLinkage()) {
146 default: assert(0 && "Unsupported linkage type!");
147 case Function::PrivateLinkage:
148 case Function::InternalLinkage:
149 EmitAlignment(FnAlign);
151 case Function::DLLExportLinkage:
152 DLLExportedFns.insert(CurrentFnName);
154 case Function::ExternalLinkage:
155 O << "\tpublic " << CurrentFnName << "\n";
156 EmitAlignment(FnAlign);
160 O << CurrentFnName << "\tproc near\n";
162 // Print out code for the function.
163 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
165 // Print a label for the basic block if there are any predecessors.
166 if (!I->pred_empty()) {
167 printBasicBlockLabel(I, true, true);
170 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
172 // Print the assembly for the instruction.
173 printMachineInstruction(II);
177 // Print out jump tables referenced by the function.
178 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
180 O << CurrentFnName << "\tendp\n";
184 // We didn't modify anything.
188 void X86IntelAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
189 unsigned char value = MI->getOperand(Op).getImm();
190 assert(value <= 7 && "Invalid ssecc argument!");
192 case 0: O << "eq"; break;
193 case 1: O << "lt"; break;
194 case 2: O << "le"; break;
195 case 3: O << "unord"; break;
196 case 4: O << "neq"; break;
197 case 5: O << "nlt"; break;
198 case 6: O << "nle"; break;
199 case 7: O << "ord"; break;
203 void X86IntelAsmPrinter::printOp(const MachineOperand &MO,
204 const char *Modifier) {
205 switch (MO.getType()) {
206 case MachineOperand::MO_Register: {
207 if (TargetRegisterInfo::isPhysicalRegister(MO.getReg())) {
208 unsigned Reg = MO.getReg();
209 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
210 MVT VT = (strcmp(Modifier,"subreg64") == 0) ?
211 MVT::i64 : ((strcmp(Modifier, "subreg32") == 0) ? MVT::i32 :
212 ((strcmp(Modifier,"subreg16") == 0) ? MVT::i16 :MVT::i8));
213 Reg = getX86SubSuperRegister(Reg, VT);
215 O << TRI->getName(Reg);
217 O << "reg" << MO.getReg();
220 case MachineOperand::MO_Immediate:
223 case MachineOperand::MO_JumpTableIndex: {
224 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
225 if (!isMemOp) O << "OFFSET ";
226 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
227 << "_" << MO.getIndex();
230 case MachineOperand::MO_ConstantPoolIndex: {
231 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
232 if (!isMemOp) O << "OFFSET ";
233 O << "[" << TAI->getPrivateGlobalPrefix() << "CPI"
234 << getFunctionNumber() << "_" << MO.getIndex();
235 printOffset(MO.getOffset());
239 case MachineOperand::MO_GlobalAddress: {
240 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
241 GlobalValue *GV = MO.getGlobal();
242 std::string Name = Mang->getValueName(GV);
244 decorateName(Name, GV);
246 if (!isMemOp) O << "OFFSET ";
248 // Handle dllimport linkage.
249 // FIXME: This should be fixed with full support of stdcall & fastcall
251 if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
255 printOffset(MO.getOffset());
258 case MachineOperand::MO_ExternalSymbol: {
259 O << TAI->getGlobalPrefix() << MO.getSymbolName();
263 O << "<unknown operand type>"; return;
267 void X86IntelAsmPrinter::print_pcrel_imm(const MachineInstr *MI, unsigned OpNo){
268 const MachineOperand &MO = MI->getOperand(OpNo);
269 switch (MO.getType()) {
270 default: assert(0 && "Unknown pcrel immediate operand");
271 case MachineOperand::MO_Immediate:
274 case MachineOperand::MO_MachineBasicBlock:
275 printBasicBlockLabel(MO.getMBB());
278 case MachineOperand::MO_GlobalAddress: {
279 GlobalValue *GV = MO.getGlobal();
280 std::string Name = Mang->getValueName(GV);
281 decorateName(Name, GV);
283 // Handle dllimport linkage.
284 // FIXME: This should be fixed with full support of stdcall & fastcall
286 if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
289 printOffset(MO.getOffset());
293 case MachineOperand::MO_ExternalSymbol:
294 O << TAI->getGlobalPrefix() << MO.getSymbolName();
300 void X86IntelAsmPrinter::printLeaMemReference(const MachineInstr *MI,
302 const char *Modifier) {
303 const MachineOperand &BaseReg = MI->getOperand(Op);
304 int ScaleVal = MI->getOperand(Op+1).getImm();
305 const MachineOperand &IndexReg = MI->getOperand(Op+2);
306 const MachineOperand &DispSpec = MI->getOperand(Op+3);
309 bool NeedPlus = false;
310 if (BaseReg.getReg()) {
311 printOp(BaseReg, Modifier);
315 if (IndexReg.getReg()) {
316 if (NeedPlus) O << " + ";
318 O << ScaleVal << "*";
319 printOp(IndexReg, Modifier);
323 if (DispSpec.isGlobal() || DispSpec.isCPI() ||
327 printOp(DispSpec, "mem");
329 int DispVal = DispSpec.getImm();
330 if (DispVal || (!BaseReg.getReg() && !IndexReg.getReg())) {
345 void X86IntelAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
346 const char *Modifier) {
347 assert(isMem(MI, Op) && "Invalid memory reference!");
348 MachineOperand Segment = MI->getOperand(Op+4);
349 if (Segment.getReg()) {
350 printOperand(MI, Op+4, Modifier);
353 printLeaMemReference(MI, Op, Modifier);
356 void X86IntelAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
357 const MachineBasicBlock *MBB) const {
358 if (!TAI->getSetDirective())
361 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
362 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
363 printBasicBlockLabel(MBB, false, false, false);
364 O << '-' << "\"L" << getFunctionNumber() << "$pb\"'\n";
367 void X86IntelAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
368 O << "L" << getFunctionNumber() << "$pb\n";
369 O << "L" << getFunctionNumber() << "$pb:";
372 bool X86IntelAsmPrinter::printAsmMRegister(const MachineOperand &MO,
374 unsigned Reg = MO.getReg();
376 default: return true; // Unknown mode.
377 case 'b': // Print QImode register
378 Reg = getX86SubSuperRegister(Reg, MVT::i8);
380 case 'h': // Print QImode high register
381 Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
383 case 'w': // Print HImode register
384 Reg = getX86SubSuperRegister(Reg, MVT::i16);
386 case 'k': // Print SImode register
387 Reg = getX86SubSuperRegister(Reg, MVT::i32);
391 O << TRI->getName(Reg);
395 /// PrintAsmOperand - Print out an operand for an inline asm expression.
397 bool X86IntelAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
399 const char *ExtraCode) {
400 // Does this asm operand have a single letter operand modifier?
401 if (ExtraCode && ExtraCode[0]) {
402 if (ExtraCode[1] != 0) return true; // Unknown modifier.
404 switch (ExtraCode[0]) {
405 default: return true; // Unknown modifier.
406 case 'b': // Print QImode register
407 case 'h': // Print QImode high register
408 case 'w': // Print HImode register
409 case 'k': // Print SImode register
410 return printAsmMRegister(MI->getOperand(OpNo), ExtraCode[0]);
414 printOperand(MI, OpNo);
418 bool X86IntelAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
421 const char *ExtraCode) {
422 if (ExtraCode && ExtraCode[0])
423 return true; // Unknown modifier.
424 printMemReference(MI, OpNo);
428 /// printMachineInstruction -- Print out a single X86 LLVM instruction
429 /// MI in Intel syntax to the current output stream.
431 void X86IntelAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
434 // Call the autogenerated instruction printer routines.
435 printInstruction(MI);
438 bool X86IntelAsmPrinter::doInitialization(Module &M) {
439 bool Result = AsmPrinter::doInitialization(M);
441 Mang->markCharUnacceptable('.');
443 O << "\t.686\n\t.MMX\n\t.XMM\n\t.model flat\n\n";
445 // Emit declarations for external functions.
446 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
447 if (I->isDeclaration()) {
448 std::string Name = Mang->getValueName(I);
449 decorateName(Name, I);
452 if (I->hasDLLImportLinkage()) {
455 O << Name << ":near\n";
458 // Emit declarations for external globals. Note that VC++ always declares
459 // external globals to have type byte, and if that's good enough for VC++...
460 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
462 if (I->isDeclaration()) {
463 std::string Name = Mang->getValueName(I);
466 if (I->hasDLLImportLinkage()) {
469 O << Name << ":byte\n";
476 bool X86IntelAsmPrinter::doFinalization(Module &M) {
477 const TargetData *TD = TM.getTargetData();
479 // Print out module-level global variables here.
480 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
482 if (I->isDeclaration()) continue; // External global require no code
484 // Check to see if this is a special global used by LLVM, if so, emit it.
485 if (EmitSpecialLLVMGlobal(I))
488 std::string name = Mang->getValueName(I);
489 Constant *C = I->getInitializer();
490 unsigned Align = TD->getPreferredAlignmentLog(I);
491 bool bCustomSegment = false;
493 switch (I->getLinkage()) {
494 case GlobalValue::CommonLinkage:
495 case GlobalValue::LinkOnceAnyLinkage:
496 case GlobalValue::LinkOnceODRLinkage:
497 case GlobalValue::WeakAnyLinkage:
498 case GlobalValue::WeakODRLinkage:
499 SwitchToDataSection("");
500 O << name << "?\tSEGEMNT PARA common 'COMMON'\n";
501 bCustomSegment = true;
502 // FIXME: the default alignment is 16 bytes, but 1, 2, 4, and 256
503 // are also available.
505 case GlobalValue::AppendingLinkage:
506 SwitchToDataSection("");
507 O << name << "?\tSEGMENT PARA public 'DATA'\n";
508 bCustomSegment = true;
509 // FIXME: the default alignment is 16 bytes, but 1, 2, 4, and 256
510 // are also available.
512 case GlobalValue::DLLExportLinkage:
513 DLLExportedGVs.insert(name);
515 case GlobalValue::ExternalLinkage:
516 O << "\tpublic " << name << "\n";
518 case GlobalValue::InternalLinkage:
519 SwitchToSection(TAI->getDataSection());
522 assert(0 && "Unknown linkage type!");
526 EmitAlignment(Align, I);
530 O << "\t\t\t\t" << TAI->getCommentString()
531 << " " << I->getName();
534 EmitGlobalConstant(C);
537 O << name << "?\tends\n";
540 // Output linker support code for dllexported globals
541 if (!DLLExportedGVs.empty() || !DLLExportedFns.empty()) {
542 SwitchToDataSection("");
543 O << "; WARNING: The following code is valid only with MASM v8.x"
544 << "and (possible) higher\n"
545 << "; This version of MASM is usually shipped with Microsoft "
546 << "Visual Studio 2005\n"
547 << "; or (possible) further versions. Unfortunately, there is no "
548 << "way to support\n"
549 << "; dllexported symbols in the earlier versions of MASM in fully "
550 << "automatic way\n\n";
551 O << "_drectve\t segment info alias('.drectve')\n";
554 for (StringSet<>::iterator i = DLLExportedGVs.begin(),
555 e = DLLExportedGVs.end();
557 O << "\t db ' /EXPORT:" << i->getKeyData() << ",data'\n";
559 for (StringSet<>::iterator i = DLLExportedFns.begin(),
560 e = DLLExportedFns.end();
562 O << "\t db ' /EXPORT:" << i->getKeyData() << "'\n";
564 if (!DLLExportedGVs.empty() || !DLLExportedFns.empty())
565 O << "_drectve\t ends\n";
567 // Bypass X86SharedAsmPrinter::doFinalization().
568 bool Result = AsmPrinter::doFinalization(M);
569 SwitchToDataSection("");
574 void X86IntelAsmPrinter::EmitString(const ConstantArray *CVA) const {
575 unsigned NumElts = CVA->getNumOperands();
577 // ML does not have escape sequences except '' for '. It also has a maximum
578 // string length of 255.
580 bool inString = false;
581 for (unsigned i = 0; i < NumElts; i++) {
582 int n = cast<ConstantInt>(CVA->getOperand(i))->getZExtValue() & 255;
586 if (n >= 32 && n <= 127) {
613 len += 1 + (n > 9) + (n > 99);
634 // Include the auto-generated portion of the assembly writer.
635 #include "X86GenAsmWriter1.inc"