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->getTypePaddedSize(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();
136 // Populate function information map. Actually, We don't want to populate
137 // non-stdcall or non-fastcall functions' information right now.
138 if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
139 FunctionInfoMap[F] = *MF.getInfo<X86MachineFunctionInfo>();
141 decorateName(CurrentFnName, F);
143 SwitchToTextSection("_text", F);
145 unsigned FnAlign = 4;
146 if (F->hasFnAttr(Attribute::OptimizeForSize))
148 switch (F->getLinkage()) {
149 default: assert(0 && "Unsupported linkage type!");
150 case Function::PrivateLinkage:
151 case Function::InternalLinkage:
152 EmitAlignment(FnAlign);
154 case Function::DLLExportLinkage:
155 DLLExportedFns.insert(CurrentFnName);
157 case Function::ExternalLinkage:
158 O << "\tpublic " << CurrentFnName << "\n";
159 EmitAlignment(FnAlign);
163 O << CurrentFnName << "\tproc near\n";
165 // Print out code for the function.
166 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
168 // Print a label for the basic block if there are any predecessors.
169 if (!I->pred_empty()) {
170 printBasicBlockLabel(I, true, true);
173 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
175 // Print the assembly for the instruction.
176 printMachineInstruction(II);
180 // Print out jump tables referenced by the function.
181 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
183 O << CurrentFnName << "\tendp\n";
187 // We didn't modify anything.
191 void X86IntelAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
192 unsigned char value = MI->getOperand(Op).getImm();
193 assert(value <= 7 && "Invalid ssecc argument!");
195 case 0: O << "eq"; break;
196 case 1: O << "lt"; break;
197 case 2: O << "le"; break;
198 case 3: O << "unord"; break;
199 case 4: O << "neq"; break;
200 case 5: O << "nlt"; break;
201 case 6: O << "nle"; break;
202 case 7: O << "ord"; break;
206 void X86IntelAsmPrinter::printOp(const MachineOperand &MO,
207 const char *Modifier) {
208 switch (MO.getType()) {
209 case MachineOperand::MO_Register: {
210 if (TargetRegisterInfo::isPhysicalRegister(MO.getReg())) {
211 unsigned Reg = MO.getReg();
212 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
213 MVT VT = (strcmp(Modifier,"subreg64") == 0) ?
214 MVT::i64 : ((strcmp(Modifier, "subreg32") == 0) ? MVT::i32 :
215 ((strcmp(Modifier,"subreg16") == 0) ? MVT::i16 :MVT::i8));
216 Reg = getX86SubSuperRegister(Reg, VT);
218 O << TRI->getName(Reg);
220 O << "reg" << MO.getReg();
223 case MachineOperand::MO_Immediate:
226 case MachineOperand::MO_MachineBasicBlock:
227 printBasicBlockLabel(MO.getMBB());
229 case MachineOperand::MO_JumpTableIndex: {
230 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
231 if (!isMemOp) O << "OFFSET ";
232 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
233 << "_" << MO.getIndex();
236 case MachineOperand::MO_ConstantPoolIndex: {
237 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
238 if (!isMemOp) O << "OFFSET ";
239 O << "[" << TAI->getPrivateGlobalPrefix() << "CPI"
240 << getFunctionNumber() << "_" << MO.getIndex();
241 printOffset(MO.getOffset());
245 case MachineOperand::MO_GlobalAddress: {
246 bool isCallOp = Modifier && !strcmp(Modifier, "call");
247 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
248 GlobalValue *GV = MO.getGlobal();
249 std::string Name = Mang->getValueName(GV);
251 decorateName(Name, GV);
253 if (!isMemOp && !isCallOp) O << "OFFSET ";
254 if (GV->hasDLLImportLinkage()) {
255 // FIXME: This should be fixed with full support of stdcall & fastcall
260 printOffset(MO.getOffset());
263 case MachineOperand::MO_ExternalSymbol: {
264 bool isCallOp = Modifier && !strcmp(Modifier, "call");
265 if (!isCallOp) O << "OFFSET ";
266 O << TAI->getGlobalPrefix() << MO.getSymbolName();
270 O << "<unknown operand type>"; return;
274 void X86IntelAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
275 const char *Modifier) {
276 assert(isMem(MI, Op) && "Invalid memory reference!");
278 const MachineOperand &BaseReg = MI->getOperand(Op);
279 int ScaleVal = MI->getOperand(Op+1).getImm();
280 const MachineOperand &IndexReg = MI->getOperand(Op+2);
281 const MachineOperand &DispSpec = MI->getOperand(Op+3);
284 bool NeedPlus = false;
285 if (BaseReg.getReg()) {
286 printOp(BaseReg, Modifier);
290 if (IndexReg.getReg()) {
291 if (NeedPlus) O << " + ";
293 O << ScaleVal << "*";
294 printOp(IndexReg, Modifier);
298 if (DispSpec.isGlobal() || DispSpec.isCPI() ||
302 printOp(DispSpec, "mem");
304 int DispVal = DispSpec.getImm();
305 if (DispVal || (!BaseReg.getReg() && !IndexReg.getReg())) {
320 void X86IntelAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
321 const MachineBasicBlock *MBB) const {
322 if (!TAI->getSetDirective())
325 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
326 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
327 printBasicBlockLabel(MBB, false, false, false);
328 O << '-' << "\"L" << getFunctionNumber() << "$pb\"'\n";
331 void X86IntelAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
332 O << "\"L" << getFunctionNumber() << "$pb\"\n";
333 O << "\"L" << getFunctionNumber() << "$pb\":";
336 bool X86IntelAsmPrinter::printAsmMRegister(const MachineOperand &MO,
338 unsigned Reg = MO.getReg();
340 default: return true; // Unknown mode.
341 case 'b': // Print QImode register
342 Reg = getX86SubSuperRegister(Reg, MVT::i8);
344 case 'h': // Print QImode high register
345 Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
347 case 'w': // Print HImode register
348 Reg = getX86SubSuperRegister(Reg, MVT::i16);
350 case 'k': // Print SImode register
351 Reg = getX86SubSuperRegister(Reg, MVT::i32);
355 O << '%' << TRI->getName(Reg);
359 /// PrintAsmOperand - Print out an operand for an inline asm expression.
361 bool X86IntelAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
363 const char *ExtraCode) {
364 // Does this asm operand have a single letter operand modifier?
365 if (ExtraCode && ExtraCode[0]) {
366 if (ExtraCode[1] != 0) return true; // Unknown modifier.
368 switch (ExtraCode[0]) {
369 default: return true; // Unknown modifier.
370 case 'b': // Print QImode register
371 case 'h': // Print QImode high register
372 case 'w': // Print HImode register
373 case 'k': // Print SImode register
374 return printAsmMRegister(MI->getOperand(OpNo), ExtraCode[0]);
378 printOperand(MI, OpNo);
382 bool X86IntelAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
385 const char *ExtraCode) {
386 if (ExtraCode && ExtraCode[0])
387 return true; // Unknown modifier.
388 printMemReference(MI, OpNo);
392 /// printMachineInstruction -- Print out a single X86 LLVM instruction
393 /// MI in Intel syntax to the current output stream.
395 void X86IntelAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
398 // Call the autogenerated instruction printer routines.
399 printInstruction(MI);
402 bool X86IntelAsmPrinter::doInitialization(Module &M) {
403 bool Result = AsmPrinter::doInitialization(M);
405 Mang->markCharUnacceptable('.');
407 O << "\t.686\n\t.model flat\n\n";
409 // Emit declarations for external functions.
410 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
411 if (I->isDeclaration()) {
412 std::string Name = Mang->getValueName(I);
413 decorateName(Name, I);
416 if (I->hasDLLImportLinkage()) {
419 O << Name << ":near\n";
422 // Emit declarations for external globals. Note that VC++ always declares
423 // external globals to have type byte, and if that's good enough for VC++...
424 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
426 if (I->isDeclaration()) {
427 std::string Name = Mang->getValueName(I);
430 if (I->hasDLLImportLinkage()) {
433 O << Name << ":byte\n";
440 bool X86IntelAsmPrinter::doFinalization(Module &M) {
441 const TargetData *TD = TM.getTargetData();
443 // Print out module-level global variables here.
444 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
446 if (I->isDeclaration()) continue; // External global require no code
448 // Check to see if this is a special global used by LLVM, if so, emit it.
449 if (EmitSpecialLLVMGlobal(I))
452 std::string name = Mang->getValueName(I);
453 Constant *C = I->getInitializer();
454 unsigned Align = TD->getPreferredAlignmentLog(I);
455 bool bCustomSegment = false;
457 switch (I->getLinkage()) {
458 case GlobalValue::CommonLinkage:
459 case GlobalValue::LinkOnceAnyLinkage:
460 case GlobalValue::LinkOnceODRLinkage:
461 case GlobalValue::WeakAnyLinkage:
462 case GlobalValue::WeakODRLinkage:
463 SwitchToDataSection("");
464 O << name << "?\tsegment common 'COMMON'\n";
465 bCustomSegment = true;
466 // FIXME: the default alignment is 16 bytes, but 1, 2, 4, and 256
467 // are also available.
469 case GlobalValue::AppendingLinkage:
470 SwitchToDataSection("");
471 O << name << "?\tsegment public 'DATA'\n";
472 bCustomSegment = true;
473 // FIXME: the default alignment is 16 bytes, but 1, 2, 4, and 256
474 // are also available.
476 case GlobalValue::DLLExportLinkage:
477 DLLExportedGVs.insert(name);
479 case GlobalValue::ExternalLinkage:
480 O << "\tpublic " << name << "\n";
482 case GlobalValue::InternalLinkage:
483 SwitchToSection(TAI->getDataSection());
486 assert(0 && "Unknown linkage type!");
490 EmitAlignment(Align, I);
492 O << name << ":\t\t\t\t" << TAI->getCommentString()
493 << " " << I->getName() << '\n';
495 EmitGlobalConstant(C);
498 O << name << "?\tends\n";
501 // Output linker support code for dllexported globals
502 if (!DLLExportedGVs.empty() || !DLLExportedFns.empty()) {
503 SwitchToDataSection("");
504 O << "; WARNING: The following code is valid only with MASM v8.x"
505 << "and (possible) higher\n"
506 << "; This version of MASM is usually shipped with Microsoft "
507 << "Visual Studio 2005\n"
508 << "; or (possible) further versions. Unfortunately, there is no "
509 << "way to support\n"
510 << "; dllexported symbols in the earlier versions of MASM in fully "
511 << "automatic way\n\n";
512 O << "_drectve\t segment info alias('.drectve')\n";
515 for (StringSet<>::iterator i = DLLExportedGVs.begin(),
516 e = DLLExportedGVs.end();
518 O << "\t db ' /EXPORT:" << i->getKeyData() << ",data'\n";
520 for (StringSet<>::iterator i = DLLExportedFns.begin(),
521 e = DLLExportedFns.end();
523 O << "\t db ' /EXPORT:" << i->getKeyData() << "'\n";
525 if (!DLLExportedGVs.empty() || !DLLExportedFns.empty())
526 O << "_drectve\t ends\n";
528 // Bypass X86SharedAsmPrinter::doFinalization().
529 bool Result = AsmPrinter::doFinalization(M);
530 SwitchToDataSection("");
535 void X86IntelAsmPrinter::EmitString(const ConstantArray *CVA) const {
536 unsigned NumElts = CVA->getNumOperands();
538 // ML does not have escape sequences except '' for '. It also has a maximum
539 // string length of 255.
541 bool inString = false;
542 for (unsigned i = 0; i < NumElts; i++) {
543 int n = cast<ConstantInt>(CVA->getOperand(i))->getZExtValue() & 255;
547 if (n >= 32 && n <= 127) {
574 len += 1 + (n > 9) + (n > 99);
595 // Include the auto-generated portion of the assembly writer.
596 #include "X86GenAsmWriter1.inc"