1 //===-- PTXAsmPrinter.cpp - PTX LLVM assembly writer ----------------------===//
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 PTX assembly language.
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "ptx-asm-printer"
18 #include "PTXMachineFunctionInfo.h"
19 #include "PTXTargetMachine.h"
20 #include "llvm/DerivedTypes.h"
21 #include "llvm/Module.h"
22 #include "llvm/ADT/SmallString.h"
23 #include "llvm/ADT/StringExtras.h"
24 #include "llvm/ADT/Twine.h"
25 #include "llvm/Analysis/DebugInfo.h"
26 #include "llvm/CodeGen/AsmPrinter.h"
27 #include "llvm/CodeGen/MachineFrameInfo.h"
28 #include "llvm/CodeGen/MachineInstr.h"
29 #include "llvm/CodeGen/MachineRegisterInfo.h"
30 #include "llvm/MC/MCContext.h"
31 #include "llvm/MC/MCStreamer.h"
32 #include "llvm/MC/MCSymbol.h"
33 #include "llvm/Target/Mangler.h"
34 #include "llvm/Target/TargetLoweringObjectFile.h"
35 #include "llvm/Target/TargetRegistry.h"
36 #include "llvm/Support/CommandLine.h"
37 #include "llvm/Support/Debug.h"
38 #include "llvm/Support/ErrorHandling.h"
39 #include "llvm/Support/MathExtras.h"
40 #include "llvm/Support/Path.h"
41 #include "llvm/Support/raw_ostream.h"
46 class PTXAsmPrinter : public AsmPrinter {
48 explicit PTXAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
49 : AsmPrinter(TM, Streamer) {}
51 const char *getPassName() const { return "PTX Assembly Printer"; }
53 bool doFinalization(Module &M);
55 virtual void EmitStartOfAsmFile(Module &M);
57 virtual bool runOnMachineFunction(MachineFunction &MF);
59 virtual void EmitFunctionBodyStart();
60 virtual void EmitFunctionBodyEnd() { OutStreamer.EmitRawText(Twine("}")); }
62 virtual void EmitInstruction(const MachineInstr *MI);
64 void printOperand(const MachineInstr *MI, int opNum, raw_ostream &OS);
65 void printMemOperand(const MachineInstr *MI, int opNum, raw_ostream &OS,
66 const char *Modifier = 0);
67 void printParamOperand(const MachineInstr *MI, int opNum, raw_ostream &OS,
68 const char *Modifier = 0);
69 void printReturnOperand(const MachineInstr *MI, int opNum, raw_ostream &OS,
70 const char *Modifier = 0);
71 void printPredicateOperand(const MachineInstr *MI, raw_ostream &O);
73 unsigned GetOrCreateSourceID(StringRef FileName,
77 void printInstruction(const MachineInstr *MI, raw_ostream &OS);
78 static const char *getRegisterName(unsigned RegNo);
81 void EmitVariableDeclaration(const GlobalVariable *gv);
82 void EmitFunctionDeclaration();
84 StringMap<unsigned> SourceIdMap;
85 }; // class PTXAsmPrinter
88 static const char PARAM_PREFIX[] = "__param_";
89 static const char RETURN_PREFIX[] = "__ret_";
91 static const char *getRegisterTypeName(unsigned RegNo) {
92 #define TEST_REGCLS(cls, clsstr) \
93 if (PTX::cls ## RegisterClass->contains(RegNo)) return # clsstr;
94 TEST_REGCLS(RegPred, pred);
95 TEST_REGCLS(RegI8, b8);
96 TEST_REGCLS(RegI16, b16);
97 TEST_REGCLS(RegI32, b32);
98 TEST_REGCLS(RegI64, b64);
99 TEST_REGCLS(RegF32, b32);
100 TEST_REGCLS(RegF64, b64);
103 llvm_unreachable("Not in any register class!");
107 static const char *getStateSpaceName(unsigned addressSpace) {
108 switch (addressSpace) {
109 default: llvm_unreachable("Unknown state space");
110 case PTX::GLOBAL: return "global";
111 case PTX::CONSTANT: return "const";
112 case PTX::LOCAL: return "local";
113 case PTX::PARAMETER: return "param";
114 case PTX::SHARED: return "shared";
119 static const char *getTypeName(const Type* type) {
121 switch (type->getTypeID()) {
122 default: llvm_unreachable("Unknown type");
123 case Type::FloatTyID: return ".f32";
124 case Type::DoubleTyID: return ".f64";
125 case Type::IntegerTyID:
126 switch (type->getPrimitiveSizeInBits()) {
127 default: llvm_unreachable("Unknown integer bit-width");
128 case 8: return ".u8";
129 case 16: return ".u16";
130 case 32: return ".u32";
131 case 64: return ".u64";
133 case Type::ArrayTyID:
134 case Type::PointerTyID:
135 type = dyn_cast<const SequentialType>(type)->getElementType();
142 bool PTXAsmPrinter::doFinalization(Module &M) {
143 // XXX Temproarily remove global variables so that doFinalization() will not
144 // emit them again (global variables are emitted at beginning).
146 Module::GlobalListType &global_list = M.getGlobalList();
147 int i, n = global_list.size();
148 GlobalVariable **gv_array = new GlobalVariable* [n];
150 // first, back-up GlobalVariable in gv_array
152 for (Module::global_iterator I = global_list.begin(), E = global_list.end();
156 // second, empty global_list
157 while (!global_list.empty())
158 global_list.remove(global_list.begin());
160 // call doFinalization
161 bool ret = AsmPrinter::doFinalization(M);
163 // now we restore global variables
164 for (i = 0; i < n; i ++)
165 global_list.insert(global_list.end(), gv_array[i]);
171 void PTXAsmPrinter::EmitStartOfAsmFile(Module &M)
173 const PTXSubtarget& ST = TM.getSubtarget<PTXSubtarget>();
175 OutStreamer.EmitRawText(Twine("\t.version " + ST.getPTXVersionString()));
176 OutStreamer.EmitRawText(Twine("\t.target " + ST.getTargetString() +
177 (ST.supportsDouble() ? ""
178 : ", map_f64_to_f32")));
179 // .address_size directive is optional, but it must immediately follow
180 // the .target directive if present within a module
181 if (ST.supportsPTX23()) {
182 std::string addrSize = ST.is64Bit() ? "64" : "32";
183 OutStreamer.EmitRawText(Twine("\t.address_size " + addrSize));
186 OutStreamer.AddBlankLine();
188 // Define any .file directives
189 DebugInfoFinder DbgFinder;
190 DbgFinder.processModule(M);
192 for (DebugInfoFinder::iterator I = DbgFinder.compile_unit_begin(),
193 E = DbgFinder.compile_unit_end(); I != E; ++I) {
194 DICompileUnit DIUnit(*I);
195 StringRef FN = DIUnit.getFilename();
196 StringRef Dir = DIUnit.getDirectory();
197 GetOrCreateSourceID(FN, Dir);
200 OutStreamer.AddBlankLine();
202 // declare global variables
203 for (Module::const_global_iterator i = M.global_begin(), e = M.global_end();
205 EmitVariableDeclaration(i);
208 bool PTXAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
209 SetupMachineFunction(MF);
210 EmitFunctionDeclaration();
215 void PTXAsmPrinter::EmitFunctionBodyStart() {
216 OutStreamer.EmitRawText(Twine("{"));
218 const PTXMachineFunctionInfo *MFI = MF->getInfo<PTXMachineFunctionInfo>();
220 // Print local variable definition
221 for (PTXMachineFunctionInfo::reg_iterator
222 i = MFI->localVarRegBegin(), e = MFI->localVarRegEnd(); i != e; ++ i) {
225 std::string def = "\t.reg .";
226 def += getRegisterTypeName(reg);
228 def += getRegisterName(reg);
230 OutStreamer.EmitRawText(Twine(def));
233 const MachineFrameInfo* FrameInfo = MF->getFrameInfo();
234 DEBUG(dbgs() << "Have " << FrameInfo->getNumObjects()
235 << " frame object(s)\n");
236 for (unsigned i = 0, e = FrameInfo->getNumObjects(); i != e; ++i) {
237 DEBUG(dbgs() << "Size of object: " << FrameInfo->getObjectSize(i) << "\n");
238 if (FrameInfo->getObjectSize(i) > 0) {
239 std::string def = "\t.reg .b";
240 def += utostr(FrameInfo->getObjectSize(i)*8); // Convert to bits
244 OutStreamer.EmitRawText(Twine(def));
249 void PTXAsmPrinter::EmitInstruction(const MachineInstr *MI) {
253 raw_string_ostream OS(str);
255 DebugLoc DL = MI->getDebugLoc();
256 if (!DL.isUnknown()) {
258 const MDNode *S = DL.getScope(MF->getFunction()->getContext());
260 // This is taken from DwarfDebug.cpp, which is conveniently not a public
266 DIDescriptor Scope(S);
267 if (Scope.isCompileUnit()) {
269 Fn = CU.getFilename();
270 Dir = CU.getDirectory();
271 } else if (Scope.isFile()) {
273 Fn = F.getFilename();
274 Dir = F.getDirectory();
275 } else if (Scope.isSubprogram()) {
277 Fn = SP.getFilename();
278 Dir = SP.getDirectory();
279 } else if (Scope.isLexicalBlock()) {
280 DILexicalBlock DB(S);
281 Fn = DB.getFilename();
282 Dir = DB.getDirectory();
284 assert(0 && "Unexpected scope info");
286 Src = GetOrCreateSourceID(Fn, Dir);
288 OutStreamer.EmitDwarfLocDirective(Src, DL.getLine(), DL.getCol(),
291 const MCDwarfLoc& MDL = OutContext.getCurrentDwarfLoc();
294 OS << utostr(MDL.getFileNum());
296 OS << utostr(MDL.getLine());
298 OS << utostr(MDL.getColumn());
304 printPredicateOperand(MI, OS);
306 // Write instruction to str
307 printInstruction(MI, OS);
311 StringRef strref = StringRef(str);
312 OutStreamer.EmitRawText(strref);
315 void PTXAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
317 const MachineOperand &MO = MI->getOperand(opNum);
319 switch (MO.getType()) {
321 llvm_unreachable("<unknown operand type>");
323 case MachineOperand::MO_GlobalAddress:
324 OS << *Mang->getSymbol(MO.getGlobal());
326 case MachineOperand::MO_Immediate:
327 OS << (long) MO.getImm();
329 case MachineOperand::MO_MachineBasicBlock:
330 OS << *MO.getMBB()->getSymbol();
332 case MachineOperand::MO_Register:
333 OS << getRegisterName(MO.getReg());
335 case MachineOperand::MO_FPImmediate:
336 APInt constFP = MO.getFPImm()->getValueAPF().bitcastToAPInt();
337 bool isFloat = MO.getFPImm()->getType()->getTypeID() == Type::FloatTyID;
338 // Emit 0F for 32-bit floats and 0D for 64-bit doubles.
345 // Emit the encoded floating-point value.
346 if (constFP.getZExtValue() > 0) {
347 OS << constFP.toString(16, false);
351 // If We have a double-precision zero, pad to 8-bytes.
360 void PTXAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
361 raw_ostream &OS, const char *Modifier) {
362 printOperand(MI, opNum, OS);
364 if (MI->getOperand(opNum+1).isImm() && MI->getOperand(opNum+1).getImm() == 0)
365 return; // don't print "+0"
368 printOperand(MI, opNum+1, OS);
371 void PTXAsmPrinter::printParamOperand(const MachineInstr *MI, int opNum,
372 raw_ostream &OS, const char *Modifier) {
373 OS << PARAM_PREFIX << (int) MI->getOperand(opNum).getImm() + 1;
376 void PTXAsmPrinter::printReturnOperand(const MachineInstr *MI, int opNum,
377 raw_ostream &OS, const char *Modifier) {
378 OS << RETURN_PREFIX << (int) MI->getOperand(opNum).getImm() + 1;
381 void PTXAsmPrinter::EmitVariableDeclaration(const GlobalVariable *gv) {
382 // Check to see if this is a special global used by LLVM, if so, emit it.
383 if (EmitSpecialLLVMGlobal(gv))
386 MCSymbol *gvsym = Mang->getSymbol(gv);
388 assert(gvsym->isUndefined() && "Cannot define a symbol twice!");
392 // check if it is defined in some other translation unit
393 if (gv->isDeclaration())
396 // state space: e.g., .global
398 decl += getStateSpaceName(gv->getType()->getAddressSpace());
401 // alignment (optional)
402 unsigned alignment = gv->getAlignment();
403 if (alignment != 0) {
405 decl += utostr(Log2_32(gv->getAlignment()));
410 if (PointerType::classof(gv->getType())) {
411 const PointerType* pointerTy = dyn_cast<const PointerType>(gv->getType());
412 const Type* elementTy = pointerTy->getElementType();
415 decl += gvsym->getName();
418 if (elementTy->isArrayTy())
420 assert(elementTy->isArrayTy() && "Only pointers to arrays are supported");
422 const ArrayType* arrayTy = dyn_cast<const ArrayType>(elementTy);
423 elementTy = arrayTy->getElementType();
425 unsigned numElements = arrayTy->getNumElements();
427 while (elementTy->isArrayTy()) {
429 arrayTy = dyn_cast<const ArrayType>(elementTy);
430 elementTy = arrayTy->getElementType();
432 numElements *= arrayTy->getNumElements();
435 // FIXME: isPrimitiveType() == false for i16?
436 assert(elementTy->isSingleValueType() &&
437 "Non-primitive types are not handled");
439 // Compute the size of the array, in bytes.
440 uint64_t arraySize = (elementTy->getPrimitiveSizeInBits() >> 3)
443 decl += utostr(arraySize);
448 // handle string constants (assume ConstantArray means string)
450 if (gv->hasInitializer())
452 const Constant *C = gv->getInitializer();
453 if (const ConstantArray *CA = dyn_cast<ConstantArray>(C))
457 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i)
459 if (i > 0) decl += ",";
462 utohexstr(cast<ConstantInt>(CA->getOperand(i))->getZExtValue());
470 // Note: this is currently the fall-through case and most likely generates
472 decl += getTypeName(gv->getType());
475 decl += gvsym->getName();
477 if (ArrayType::classof(gv->getType()) ||
478 PointerType::classof(gv->getType()))
484 OutStreamer.EmitRawText(Twine(decl));
486 OutStreamer.AddBlankLine();
489 void PTXAsmPrinter::EmitFunctionDeclaration() {
490 // The function label could have already been emitted if two symbols end up
491 // conflicting due to asm renaming. Detect this and emit an error.
492 if (!CurrentFnSym->isUndefined()) {
493 report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
494 "' label emitted multiple times to assembly file");
498 const PTXMachineFunctionInfo *MFI = MF->getInfo<PTXMachineFunctionInfo>();
499 const bool isKernel = MFI->isKernel();
500 const PTXSubtarget& ST = TM.getSubtarget<PTXSubtarget>();
502 std::string decl = isKernel ? ".entry" : ".func";
508 for (PTXMachineFunctionInfo::ret_iterator
509 i = MFI->retRegBegin(), e = MFI->retRegEnd(), b = i;
515 decl += getRegisterTypeName(*i);
517 decl += getRegisterName(*i);
522 // Print function name
524 decl += CurrentFnSym->getName().str();
531 for (PTXMachineFunctionInfo::reg_iterator
532 i = MFI->argRegBegin(), e = MFI->argRegEnd(), b = i;
537 if (isKernel || ST.useParamSpaceForDeviceArgs()) {
541 decl += PARAM_PREFIX;
542 decl += utostr(++cnt);
545 decl += getRegisterTypeName(*i);
547 decl += getRegisterName(*i);
552 OutStreamer.EmitRawText(Twine(decl));
556 printPredicateOperand(const MachineInstr *MI, raw_ostream &O) {
557 int i = MI->findFirstPredOperandIdx();
559 llvm_unreachable("missing predicate operand");
561 unsigned reg = MI->getOperand(i).getReg();
562 int predOp = MI->getOperand(i+1).getImm();
564 DEBUG(dbgs() << "predicate: (" << reg << ", " << predOp << ")\n");
566 if (reg != PTX::NoRegister) {
568 if (predOp == PTX::PRED_NEGATE)
570 O << getRegisterName(reg);
574 unsigned PTXAsmPrinter::GetOrCreateSourceID(StringRef FileName,
576 // If FE did not provide a file name, then assume stdin.
577 if (FileName.empty())
578 return GetOrCreateSourceID("<stdin>", StringRef());
580 // MCStream expects full path name as filename.
581 if (!DirName.empty() && !sys::path::is_absolute(FileName)) {
582 SmallString<128> FullPathName = DirName;
583 sys::path::append(FullPathName, FileName);
584 // Here FullPathName will be copied into StringMap by GetOrCreateSourceID.
585 return GetOrCreateSourceID(StringRef(FullPathName), StringRef());
588 StringMapEntry<unsigned> &Entry = SourceIdMap.GetOrCreateValue(FileName);
589 if (Entry.getValue())
590 return Entry.getValue();
592 unsigned SrcId = SourceIdMap.size();
593 Entry.setValue(SrcId);
595 // Print out a .file directive to specify files for .loc directives.
596 OutStreamer.EmitDwarfFileDirective(SrcId, Entry.getKey());
601 #include "PTXGenAsmWriter.inc"
603 // Force static initialization.
604 extern "C" void LLVMInitializePTXAsmPrinter() {
605 RegisterAsmPrinter<PTXAsmPrinter> X(ThePTX32Target);
606 RegisterAsmPrinter<PTXAsmPrinter> Y(ThePTX64Target);