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 "X86TargetAsmInfo.h"
20 #include "llvm/CallingConv.h"
21 #include "llvm/Constants.h"
22 #include "llvm/Module.h"
23 #include "llvm/Assembly/Writer.h"
24 #include "llvm/Support/Mangler.h"
25 #include "llvm/Target/TargetAsmInfo.h"
26 #include "llvm/Target/TargetOptions.h"
27 #include "llvm/ADT/Statistic.h"
30 STATISTIC(EmittedInsts, "Number of machine instrs printed");
32 std::string X86IntelAsmPrinter::getSectionForFunction(const Function &F) const {
33 // Intel asm always emits functions to _text.
37 /// runOnMachineFunction - This uses the printMachineInstruction()
38 /// method to print assembly for each instruction.
40 bool X86IntelAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
41 SetupMachineFunction(MF);
44 // Print out constants referenced by the function
45 EmitConstantPool(MF.getConstantPool());
47 // Print out labels for the function.
48 const Function *F = MF.getFunction();
49 unsigned CC = F->getCallingConv();
51 // Populate function information map. Actually, We don't want to populate
52 // non-stdcall or non-fastcall functions' information right now.
53 if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
54 FunctionInfoMap[F] = *MF.getInfo<X86MachineFunctionInfo>();
56 X86SharedAsmPrinter::decorateName(CurrentFnName, F);
58 SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
60 switch (F->getLinkage()) {
61 default: assert(0 && "Unsupported linkage type!");
62 case Function::InternalLinkage:
65 case Function::DLLExportLinkage:
66 DLLExportedFns.insert(CurrentFnName);
68 case Function::ExternalLinkage:
69 O << "\tpublic " << CurrentFnName << "\n";
74 O << CurrentFnName << "\tproc near\n";
76 // Print out code for the function.
77 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
79 // Print a label for the basic block if there are any predecessors.
80 if (!I->pred_empty()) {
81 printBasicBlockLabel(I, true);
84 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
86 // Print the assembly for the instruction.
88 printMachineInstruction(II);
92 // Print out jump tables referenced by the function.
93 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
95 O << CurrentFnName << "\tendp\n";
97 // We didn't modify anything.
101 void X86IntelAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
102 unsigned char value = MI->getOperand(Op).getImm();
103 assert(value <= 7 && "Invalid ssecc argument!");
105 case 0: O << "eq"; break;
106 case 1: O << "lt"; break;
107 case 2: O << "le"; break;
108 case 3: O << "unord"; break;
109 case 4: O << "neq"; break;
110 case 5: O << "nlt"; break;
111 case 6: O << "nle"; break;
112 case 7: O << "ord"; break;
116 void X86IntelAsmPrinter::printOp(const MachineOperand &MO,
117 const char *Modifier) {
118 const MRegisterInfo &RI = *TM.getRegisterInfo();
119 switch (MO.getType()) {
120 case MachineOperand::MO_Register: {
121 if (MRegisterInfo::isPhysicalRegister(MO.getReg())) {
122 unsigned Reg = MO.getReg();
123 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
124 MVT::ValueType VT = (strcmp(Modifier,"subreg64") == 0) ?
125 MVT::i64 : ((strcmp(Modifier, "subreg32") == 0) ? MVT::i32 :
126 ((strcmp(Modifier,"subreg16") == 0) ? MVT::i16 :MVT::i8));
127 Reg = getX86SubSuperRegister(Reg, VT);
129 O << RI.get(Reg).Name;
131 O << "reg" << MO.getReg();
134 case MachineOperand::MO_Immediate:
137 case MachineOperand::MO_MachineBasicBlock:
138 printBasicBlockLabel(MO.getMBB());
140 case MachineOperand::MO_JumpTableIndex: {
141 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
142 if (!isMemOp) O << "OFFSET ";
143 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
144 << "_" << MO.getIndex();
147 case MachineOperand::MO_ConstantPoolIndex: {
148 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
149 if (!isMemOp) O << "OFFSET ";
150 O << "[" << TAI->getPrivateGlobalPrefix() << "CPI"
151 << getFunctionNumber() << "_" << MO.getIndex();
152 int Offset = MO.getOffset();
154 O << " + " << Offset;
160 case MachineOperand::MO_GlobalAddress: {
161 bool isCallOp = Modifier && !strcmp(Modifier, "call");
162 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
163 GlobalValue *GV = MO.getGlobal();
164 std::string Name = Mang->getValueName(GV);
166 X86SharedAsmPrinter::decorateName(Name, GV);
168 if (!isMemOp && !isCallOp) O << "OFFSET ";
169 if (GV->hasDLLImportLinkage()) {
170 // FIXME: This should be fixed with full support of stdcall & fastcall
175 int Offset = MO.getOffset();
177 O << " + " << Offset;
182 case MachineOperand::MO_ExternalSymbol: {
183 bool isCallOp = Modifier && !strcmp(Modifier, "call");
184 if (!isCallOp) O << "OFFSET ";
185 O << TAI->getGlobalPrefix() << MO.getSymbolName();
189 O << "<unknown operand type>"; return;
193 void X86IntelAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
194 const char *Modifier) {
195 assert(isMem(MI, Op) && "Invalid memory reference!");
197 const MachineOperand &BaseReg = MI->getOperand(Op);
198 int ScaleVal = MI->getOperand(Op+1).getImm();
199 const MachineOperand &IndexReg = MI->getOperand(Op+2);
200 const MachineOperand &DispSpec = MI->getOperand(Op+3);
203 bool NeedPlus = false;
204 if (BaseReg.getReg()) {
205 printOp(BaseReg, Modifier);
209 if (IndexReg.getReg()) {
210 if (NeedPlus) O << " + ";
212 O << ScaleVal << "*";
213 printOp(IndexReg, Modifier);
217 if (DispSpec.isGlobalAddress() || DispSpec.isConstantPoolIndex() ||
218 DispSpec.isJumpTableIndex()) {
221 printOp(DispSpec, "mem");
223 int DispVal = DispSpec.getImm();
224 if (DispVal || (!BaseReg.getReg() && !IndexReg.getReg())) {
238 void X86IntelAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
239 const MachineBasicBlock *MBB) const {
240 if (!TAI->getSetDirective())
243 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
244 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
245 printBasicBlockLabel(MBB, false, false);
246 O << '-' << "\"L" << getFunctionNumber() << "$pb\"'\n";
249 void X86IntelAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
250 O << "\"L" << getFunctionNumber() << "$pb\"\n";
251 O << "\"L" << getFunctionNumber() << "$pb\":";
254 bool X86IntelAsmPrinter::printAsmMRegister(const MachineOperand &MO,
256 const MRegisterInfo &RI = *TM.getRegisterInfo();
257 unsigned Reg = MO.getReg();
259 default: return true; // Unknown mode.
260 case 'b': // Print QImode register
261 Reg = getX86SubSuperRegister(Reg, MVT::i8);
263 case 'h': // Print QImode high register
264 Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
266 case 'w': // Print HImode register
267 Reg = getX86SubSuperRegister(Reg, MVT::i16);
269 case 'k': // Print SImode register
270 Reg = getX86SubSuperRegister(Reg, MVT::i32);
274 O << '%' << RI.get(Reg).Name;
278 /// PrintAsmOperand - Print out an operand for an inline asm expression.
280 bool X86IntelAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
282 const char *ExtraCode) {
283 // Does this asm operand have a single letter operand modifier?
284 if (ExtraCode && ExtraCode[0]) {
285 if (ExtraCode[1] != 0) return true; // Unknown modifier.
287 switch (ExtraCode[0]) {
288 default: return true; // Unknown modifier.
289 case 'b': // Print QImode register
290 case 'h': // Print QImode high register
291 case 'w': // Print HImode register
292 case 'k': // Print SImode register
293 return printAsmMRegister(MI->getOperand(OpNo), ExtraCode[0]);
297 printOperand(MI, OpNo);
301 bool X86IntelAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
304 const char *ExtraCode) {
305 if (ExtraCode && ExtraCode[0])
306 return true; // Unknown modifier.
307 printMemReference(MI, OpNo);
311 /// printMachineInstruction -- Print out a single X86 LLVM instruction
312 /// MI in Intel syntax to the current output stream.
314 void X86IntelAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
317 // See if a truncate instruction can be turned into a nop.
318 switch (MI->getOpcode()) {
320 case X86::PsMOVZX64rr32:
321 O << TAI->getCommentString() << " ZERO-EXTEND " << "\n\t";
325 // Call the autogenerated instruction printer routines.
326 printInstruction(MI);
329 bool X86IntelAsmPrinter::doInitialization(Module &M) {
330 bool Result = X86SharedAsmPrinter::doInitialization(M);
332 Mang->markCharUnacceptable('.');
334 O << "\t.686\n\t.model flat\n\n";
336 // Emit declarations for external functions.
337 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
338 if (I->isDeclaration()) {
339 std::string Name = Mang->getValueName(I);
340 X86SharedAsmPrinter::decorateName(Name, I);
343 if (I->hasDLLImportLinkage()) {
346 O << Name << ":near\n";
349 // Emit declarations for external globals. Note that VC++ always declares
350 // external globals to have type byte, and if that's good enough for VC++...
351 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
353 if (I->isDeclaration()) {
354 std::string Name = Mang->getValueName(I);
357 if (I->hasDLLImportLinkage()) {
360 O << Name << ":byte\n";
367 bool X86IntelAsmPrinter::doFinalization(Module &M) {
368 const TargetData *TD = TM.getTargetData();
370 // Print out module-level global variables here.
371 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
373 if (I->isDeclaration()) continue; // External global require no code
375 // Check to see if this is a special global used by LLVM, if so, emit it.
376 if (EmitSpecialLLVMGlobal(I))
379 std::string name = Mang->getValueName(I);
380 Constant *C = I->getInitializer();
381 unsigned Align = TD->getPreferredAlignmentLog(I);
382 bool bCustomSegment = false;
384 switch (I->getLinkage()) {
385 case GlobalValue::LinkOnceLinkage:
386 case GlobalValue::WeakLinkage:
387 SwitchToDataSection("");
388 O << name << "?\tsegment common 'COMMON'\n";
389 bCustomSegment = true;
390 // FIXME: the default alignment is 16 bytes, but 1, 2, 4, and 256
391 // are also available.
393 case GlobalValue::AppendingLinkage:
394 SwitchToDataSection("");
395 O << name << "?\tsegment public 'DATA'\n";
396 bCustomSegment = true;
397 // FIXME: the default alignment is 16 bytes, but 1, 2, 4, and 256
398 // are also available.
400 case GlobalValue::DLLExportLinkage:
401 DLLExportedGVs.insert(name);
403 case GlobalValue::ExternalLinkage:
404 O << "\tpublic " << name << "\n";
406 case GlobalValue::InternalLinkage:
407 SwitchToDataSection(TAI->getDataSection(), I);
410 assert(0 && "Unknown linkage type!");
414 EmitAlignment(Align, I);
416 O << name << ":\t\t\t\t" << TAI->getCommentString()
417 << " " << I->getName() << '\n';
419 EmitGlobalConstant(C);
422 O << name << "?\tends\n";
425 // Output linker support code for dllexported globals
426 if (!DLLExportedGVs.empty() ||
427 !DLLExportedFns.empty()) {
428 SwitchToDataSection("");
429 O << "; WARNING: The following code is valid only with MASM v8.x and (possible) higher\n"
430 << "; This version of MASM is usually shipped with Microsoft Visual Studio 2005\n"
431 << "; or (possible) further versions. Unfortunately, there is no way to support\n"
432 << "; dllexported symbols in the earlier versions of MASM in fully automatic way\n\n";
433 O << "_drectve\t segment info alias('.drectve')\n";
436 for (std::set<std::string>::iterator i = DLLExportedGVs.begin(),
437 e = DLLExportedGVs.end();
439 O << "\t db ' /EXPORT:" << *i << ",data'\n";
442 for (std::set<std::string>::iterator i = DLLExportedFns.begin(),
443 e = DLLExportedFns.end();
445 O << "\t db ' /EXPORT:" << *i << "'\n";
448 if (!DLLExportedGVs.empty() ||
449 !DLLExportedFns.empty()) {
450 O << "_drectve\t ends\n";
453 // Bypass X86SharedAsmPrinter::doFinalization().
454 bool Result = AsmPrinter::doFinalization(M);
455 SwitchToDataSection("");
460 void X86IntelAsmPrinter::EmitString(const ConstantArray *CVA) const {
461 unsigned NumElts = CVA->getNumOperands();
463 // ML does not have escape sequences except '' for '. It also has a maximum
464 // string length of 255.
466 bool inString = false;
467 for (unsigned i = 0; i < NumElts; i++) {
468 int n = cast<ConstantInt>(CVA->getOperand(i))->getZExtValue() & 255;
472 if (n >= 32 && n <= 127) {
499 len += 1 + (n > 9) + (n > 99);
520 // Include the auto-generated portion of the assembly writer.
521 #include "X86GenAsmWriter1.inc"