1 //===- lib/Target/PTX/PTXMCAsmStreamer.cpp - PTX Text Assembly Output -----===//
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 #include "llvm/ADT/OwningPtr.h"
11 #include "llvm/ADT/SmallString.h"
12 #include "llvm/ADT/Twine.h"
13 #include "llvm/MC/MCAsmInfo.h"
14 #include "llvm/MC/MCCodeEmitter.h"
15 #include "llvm/MC/MCContext.h"
16 #include "llvm/MC/MCExpr.h"
17 #include "llvm/MC/MCInst.h"
18 #include "llvm/MC/MCInstPrinter.h"
19 #include "llvm/MC/MCStreamer.h"
20 #include "llvm/MC/MCSymbol.h"
21 #include "llvm/Support/ErrorHandling.h"
22 #include "llvm/Support/MathExtras.h"
23 #include "llvm/Support/Format.h"
24 #include "llvm/Support/FormattedStream.h"
25 #include "llvm/Support/raw_ostream.h"
26 #include "llvm/Target/TargetAsmInfo.h"
31 class PTXMCAsmStreamer : public MCStreamer {
32 formatted_raw_ostream &OS;
34 OwningPtr<MCInstPrinter> InstPrinter;
35 OwningPtr<MCCodeEmitter> Emitter;
37 SmallString<128> CommentToEmit;
38 raw_svector_ostream CommentStream;
40 unsigned IsVerboseAsm : 1;
41 unsigned ShowInst : 1;
44 PTXMCAsmStreamer(MCContext &Context,
45 formatted_raw_ostream &os,
46 bool isVerboseAsm, bool useLoc,
47 MCInstPrinter *printer,
48 MCCodeEmitter *emitter,
50 : MCStreamer(Context), OS(os), MAI(Context.getAsmInfo()),
51 InstPrinter(printer), Emitter(emitter), CommentStream(CommentToEmit),
52 IsVerboseAsm(isVerboseAsm),
54 if (InstPrinter && IsVerboseAsm)
55 InstPrinter->setCommentStream(CommentStream);
58 ~PTXMCAsmStreamer() {}
60 inline void EmitEOL() {
61 // If we don't have any comments, just emit a \n.
68 void EmitCommentsAndEOL();
70 /// isVerboseAsm - Return true if this streamer supports verbose assembly at
72 virtual bool isVerboseAsm() const { return IsVerboseAsm; }
74 /// hasRawTextSupport - We support EmitRawText.
75 virtual bool hasRawTextSupport() const { return true; }
77 /// AddComment - Add a comment that can be emitted to the generated .s
78 /// file if applicable as a QoI issue to make the output of the compiler
79 /// more readable. This only affects the MCAsmStreamer, and only when
80 /// verbose assembly output is enabled.
81 virtual void AddComment(const Twine &T);
83 /// AddEncodingComment - Add a comment showing the encoding of an instruction.
84 virtual void AddEncodingComment(const MCInst &Inst);
86 /// GetCommentOS - Return a raw_ostream that comments can be written to.
87 /// Unlike AddComment, you are required to terminate comments with \n if you
89 virtual raw_ostream &GetCommentOS() {
91 return nulls(); // Discard comments unless in verbose asm mode.
95 /// AddBlankLine - Emit a blank line to a .s file to pretty it up.
96 virtual void AddBlankLine() {
100 /// @name MCStreamer Interface
103 virtual void ChangeSection(const MCSection *Section);
104 virtual void InitSections() {}
106 virtual void EmitLabel(MCSymbol *Symbol);
108 virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
110 virtual void EmitThumbFunc(MCSymbol *Func);
112 virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
114 virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
116 virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
117 const MCSymbol *LastLabel,
118 const MCSymbol *Label);
120 virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
122 virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
123 virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol);
124 virtual void EmitCOFFSymbolStorageClass(int StorageClass);
125 virtual void EmitCOFFSymbolType(int Type);
126 virtual void EndCOFFSymbolDef();
127 virtual void EmitCOFFSecRel32(MCSymbol const *Symbol);
128 virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
129 virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
130 unsigned ByteAlignment);
132 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
134 /// @param Symbol - The common symbol to emit.
135 /// @param Size - The size of the common symbol.
136 virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size);
138 virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
139 unsigned Size = 0, unsigned ByteAlignment = 0);
141 virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
142 uint64_t Size, unsigned ByteAlignment = 0);
144 virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
146 virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
147 bool isPCRel, unsigned AddrSpace);
148 virtual void EmitULEB128Value(const MCExpr *Value, unsigned AddrSpace = 0);
149 virtual void EmitSLEB128Value(const MCExpr *Value, unsigned AddrSpace = 0);
150 virtual void EmitGPRel32Value(const MCExpr *Value);
153 virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue,
156 virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
157 unsigned ValueSize = 1,
158 unsigned MaxBytesToEmit = 0);
160 virtual void EmitCodeAlignment(unsigned ByteAlignment,
161 unsigned MaxBytesToEmit = 0);
163 virtual void EmitValueToOffset(const MCExpr *Offset,
164 unsigned char Value = 0);
166 virtual void EmitFileDirective(StringRef Filename);
167 virtual bool EmitDwarfFileDirective(unsigned FileNo, StringRef Filename);
169 virtual void EmitInstruction(const MCInst &Inst);
171 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
172 /// the specified string in the output .s file. This capability is
173 /// indicated by the hasRawTextSupport() predicate.
174 virtual void EmitRawText(StringRef String);
176 virtual void Finish();
180 }; // class PTXMCAsmStreamer
184 /// TODO: Add appropriate implementation of Emit*() methods when needed
186 void PTXMCAsmStreamer::AddComment(const Twine &T) {
187 if (!IsVerboseAsm) return;
189 // Make sure that CommentStream is flushed.
190 CommentStream.flush();
192 T.toVector(CommentToEmit);
193 // Each comment goes on its own line.
194 CommentToEmit.push_back('\n');
196 // Tell the comment stream that the vector changed underneath it.
197 CommentStream.resync();
200 void PTXMCAsmStreamer::EmitCommentsAndEOL() {
201 if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
206 CommentStream.flush();
207 StringRef Comments = CommentToEmit.str();
209 assert(Comments.back() == '\n' &&
210 "Comment array not newline terminated");
212 // Emit a line of comments.
213 OS.PadToColumn(MAI.getCommentColumn());
214 size_t Position = Comments.find('\n');
215 OS << MAI.getCommentString() << ' ' << Comments.substr(0, Position) << '\n';
217 Comments = Comments.substr(Position+1);
218 } while (!Comments.empty());
220 CommentToEmit.clear();
221 // Tell the comment stream that the vector changed underneath it.
222 CommentStream.resync();
225 static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
226 assert(Bytes && "Invalid size!");
227 return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
230 void PTXMCAsmStreamer::ChangeSection(const MCSection *Section) {
231 assert(Section && "Cannot switch to a null section!");
234 void PTXMCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
235 assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
236 assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
237 assert(getCurrentSection() && "Cannot emit before setting section!");
239 OS << *Symbol << MAI.getLabelSuffix();
241 Symbol->setSection(*getCurrentSection());
244 void PTXMCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {}
246 void PTXMCAsmStreamer::EmitThumbFunc(MCSymbol *Func) {}
248 void PTXMCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
249 OS << *Symbol << " = " << *Value;
252 // FIXME: Lift context changes into super class.
253 Symbol->setVariableValue(Value);
256 void PTXMCAsmStreamer::EmitWeakReference(MCSymbol *Alias,
257 const MCSymbol *Symbol) {
258 OS << ".weakref " << *Alias << ", " << *Symbol;
262 void PTXMCAsmStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
263 const MCSymbol *LastLabel,
264 const MCSymbol *Label) {
265 report_fatal_error("Unimplemented.");
268 void PTXMCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
269 MCSymbolAttr Attribute) {}
271 void PTXMCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
273 void PTXMCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {}
275 void PTXMCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {}
277 void PTXMCAsmStreamer::EmitCOFFSymbolType (int Type) {}
279 void PTXMCAsmStreamer::EndCOFFSymbolDef() {}
281 void PTXMCAsmStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {}
283 void PTXMCAsmStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
285 void PTXMCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
286 unsigned ByteAlignment) {}
288 void PTXMCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {}
290 void PTXMCAsmStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
291 unsigned Size, unsigned ByteAlignment) {}
293 void PTXMCAsmStreamer::EmitTBSSSymbol(const MCSection *Section,
295 uint64_t Size, unsigned ByteAlignment) {}
297 static inline char toOctal(int X) { return (X&7)+'0'; }
299 static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
302 for (unsigned i = 0, e = Data.size(); i != e; ++i) {
303 unsigned char C = Data[i];
304 if (C == '"' || C == '\\') {
305 OS << '\\' << (char)C;
309 if (isprint((unsigned char)C)) {
315 case '\b': OS << "\\b"; break;
316 case '\f': OS << "\\f"; break;
317 case '\n': OS << "\\n"; break;
318 case '\r': OS << "\\r"; break;
319 case '\t': OS << "\\t"; break;
322 OS << toOctal(C >> 6);
323 OS << toOctal(C >> 3);
324 OS << toOctal(C >> 0);
332 void PTXMCAsmStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
333 assert(getCurrentSection() && "Cannot emit contents before setting section!");
334 if (Data.empty()) return;
336 if (Data.size() == 1) {
337 OS << MAI.getData8bitsDirective(AddrSpace);
338 OS << (unsigned)(unsigned char)Data[0];
343 // If the data ends with 0 and the target supports .asciz, use it, otherwise
345 if (MAI.getAscizDirective() && Data.back() == 0) {
346 OS << MAI.getAscizDirective();
347 Data = Data.substr(0, Data.size()-1);
349 OS << MAI.getAsciiDirective();
353 PrintQuotedString(Data, OS);
357 void PTXMCAsmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
358 bool isPCRel, unsigned AddrSpace) {
359 assert(getCurrentSection() && "Cannot emit contents before setting section!");
360 assert(!isPCRel && "Cannot emit pc relative relocations!");
361 const char *Directive = 0;
364 case 1: Directive = MAI.getData8bitsDirective(AddrSpace); break;
365 case 2: Directive = MAI.getData16bitsDirective(AddrSpace); break;
366 case 4: Directive = MAI.getData32bitsDirective(AddrSpace); break;
368 Directive = MAI.getData64bitsDirective(AddrSpace);
369 // If the target doesn't support 64-bit data, emit as two 32-bit halves.
370 if (Directive) break;
372 if (!Value->EvaluateAsAbsolute(IntValue))
373 report_fatal_error("Don't know how to emit this value.");
374 if (getContext().getTargetAsmInfo().isLittleEndian()) {
375 EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
376 EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
378 EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
379 EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
384 assert(Directive && "Invalid size for machine code value!");
385 OS << Directive << *Value;
389 void PTXMCAsmStreamer::EmitULEB128Value(const MCExpr *Value,
390 unsigned AddrSpace) {
391 assert(MAI.hasLEB128() && "Cannot print a .uleb");
392 OS << ".uleb128 " << *Value;
396 void PTXMCAsmStreamer::EmitSLEB128Value(const MCExpr *Value,
397 unsigned AddrSpace) {
398 assert(MAI.hasLEB128() && "Cannot print a .sleb");
399 OS << ".sleb128 " << *Value;
403 void PTXMCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
404 assert(MAI.getGPRel32Directive() != 0);
405 OS << MAI.getGPRel32Directive() << *Value;
410 /// EmitFill - Emit NumBytes bytes worth of the value specified by
411 /// FillValue. This implements directives such as '.space'.
412 void PTXMCAsmStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
413 unsigned AddrSpace) {
414 if (NumBytes == 0) return;
417 if (const char *ZeroDirective = MAI.getZeroDirective()) {
418 OS << ZeroDirective << NumBytes;
420 OS << ',' << (int)FillValue;
425 // Emit a byte at a time.
426 MCStreamer::EmitFill(NumBytes, FillValue, AddrSpace);
429 void PTXMCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
431 unsigned MaxBytesToEmit) {
432 // Some assemblers don't support non-power of two alignments, so we always
433 // emit alignments as a power of two if possible.
434 if (isPowerOf2_32(ByteAlignment)) {
436 default: llvm_unreachable("Invalid size for machine code value!");
437 case 1: OS << MAI.getAlignDirective(); break;
438 // FIXME: use MAI for this!
439 case 2: OS << ".p2alignw "; break;
440 case 4: OS << ".p2alignl "; break;
441 case 8: llvm_unreachable("Unsupported alignment size!");
444 if (MAI.getAlignmentIsInBytes())
447 OS << Log2_32(ByteAlignment);
449 if (Value || MaxBytesToEmit) {
451 OS.write_hex(truncateToSize(Value, ValueSize));
454 OS << ", " << MaxBytesToEmit;
460 // Non-power of two alignment. This is not widely supported by assemblers.
461 // FIXME: Parameterize this based on MAI.
463 default: llvm_unreachable("Invalid size for machine code value!");
464 case 1: OS << ".balign"; break;
465 case 2: OS << ".balignw"; break;
466 case 4: OS << ".balignl"; break;
467 case 8: llvm_unreachable("Unsupported alignment size!");
470 OS << ' ' << ByteAlignment;
471 OS << ", " << truncateToSize(Value, ValueSize);
473 OS << ", " << MaxBytesToEmit;
477 void PTXMCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
478 unsigned MaxBytesToEmit) {}
480 void PTXMCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
481 unsigned char Value) {}
484 void PTXMCAsmStreamer::EmitFileDirective(StringRef Filename) {
485 assert(MAI.hasSingleParameterDotFile());
487 PrintQuotedString(Filename, OS);
491 // FIXME: should we inherit from MCAsmStreamer?
492 bool PTXMCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo,
494 OS << "\t.file\t" << FileNo << ' ';
495 PrintQuotedString(Filename, OS);
497 return this->MCStreamer::EmitDwarfFileDirective(FileNo, Filename);
500 void PTXMCAsmStreamer::AddEncodingComment(const MCInst &Inst) {}
502 void PTXMCAsmStreamer::EmitInstruction(const MCInst &Inst) {
503 assert(getCurrentSection() && "Cannot emit contents before setting section!");
505 // Show the encoding in a comment if we have a code emitter.
507 AddEncodingComment(Inst);
509 // Show the MCInst if enabled.
511 Inst.dump_pretty(GetCommentOS(), &MAI, InstPrinter.get(), "\n ");
512 GetCommentOS() << "\n";
515 // If we have an AsmPrinter, use that to print, otherwise print the MCInst.
517 InstPrinter->printInst(&Inst, OS);
519 Inst.print(OS, &MAI);
523 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
524 /// the specified string in the output .s file. This capability is
525 /// indicated by the hasRawTextSupport() predicate.
526 void PTXMCAsmStreamer::EmitRawText(StringRef String) {
527 if (!String.empty() && String.back() == '\n')
528 String = String.substr(0, String.size()-1);
533 void PTXMCAsmStreamer::Finish() {}
536 MCStreamer *createPTXAsmStreamer(MCContext &Context,
537 formatted_raw_ostream &OS,
538 bool isVerboseAsm, bool useLoc,
540 MCCodeEmitter *CE, TargetAsmBackend *TAB,
542 return new PTXMCAsmStreamer(Context, OS, isVerboseAsm, useLoc,