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/MCContext.h"
15 #include "llvm/MC/MCCodeEmitter.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 SwitchSection(const MCSection *Section);
105 virtual void InitSections() {
108 virtual void EmitLabel(MCSymbol *Symbol);
110 virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
112 virtual void EmitThumbFunc(MCSymbol *Func);
114 virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
116 virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
118 virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
119 const MCSymbol *LastLabel,
120 const MCSymbol *Label);
122 virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
124 virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
125 virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol);
126 virtual void EmitCOFFSymbolStorageClass(int StorageClass);
127 virtual void EmitCOFFSymbolType(int Type);
128 virtual void EndCOFFSymbolDef();
129 virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
130 virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
131 unsigned ByteAlignment);
133 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
135 /// @param Symbol - The common symbol to emit.
136 /// @param Size - The size of the common symbol.
137 virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size);
139 virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
140 unsigned Size = 0, unsigned ByteAlignment = 0);
142 virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
143 uint64_t Size, unsigned ByteAlignment = 0);
145 virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
147 virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
148 bool isPCRel, unsigned AddrSpace);
149 virtual void EmitULEB128Value(const MCExpr *Value, unsigned AddrSpace = 0);
150 virtual void EmitSLEB128Value(const MCExpr *Value, unsigned AddrSpace = 0);
151 virtual void EmitGPRel32Value(const MCExpr *Value);
154 virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue,
157 virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
158 unsigned ValueSize = 1,
159 unsigned MaxBytesToEmit = 0);
161 virtual void EmitCodeAlignment(unsigned ByteAlignment,
162 unsigned MaxBytesToEmit = 0);
164 virtual void EmitValueToOffset(const MCExpr *Offset,
165 unsigned char Value = 0);
167 virtual void EmitFileDirective(StringRef Filename);
168 virtual bool EmitDwarfFileDirective(unsigned FileNo, StringRef Filename);
170 virtual void EmitInstruction(const MCInst &Inst);
172 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
173 /// the specified string in the output .s file. This capability is
174 /// indicated by the hasRawTextSupport() predicate.
175 virtual void EmitRawText(StringRef String);
177 virtual void Finish();
181 }; // class PTXMCAsmStreamer
185 /// TODO: Add appropriate implementation of Emit*() methods when needed
187 void PTXMCAsmStreamer::AddComment(const Twine &T) {
188 if (!IsVerboseAsm) return;
190 // Make sure that CommentStream is flushed.
191 CommentStream.flush();
193 T.toVector(CommentToEmit);
194 // Each comment goes on its own line.
195 CommentToEmit.push_back('\n');
197 // Tell the comment stream that the vector changed underneath it.
198 CommentStream.resync();
201 void PTXMCAsmStreamer::EmitCommentsAndEOL() {
202 if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
207 CommentStream.flush();
208 StringRef Comments = CommentToEmit.str();
210 assert(Comments.back() == '\n' &&
211 "Comment array not newline terminated");
213 // Emit a line of comments.
214 OS.PadToColumn(MAI.getCommentColumn());
215 size_t Position = Comments.find('\n');
216 OS << MAI.getCommentString() << ' ' << Comments.substr(0, Position) << '\n';
218 Comments = Comments.substr(Position+1);
219 } while (!Comments.empty());
221 CommentToEmit.clear();
222 // Tell the comment stream that the vector changed underneath it.
223 CommentStream.resync();
226 static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
227 assert(Bytes && "Invalid size!");
228 return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
231 void PTXMCAsmStreamer::SwitchSection(const MCSection *Section) {
232 assert(Section && "Cannot switch to a null section!");
233 if (Section != CurSection) {
234 PrevSection = CurSection;
235 CurSection = Section;
239 void PTXMCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
240 assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
241 assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
242 assert(CurSection && "Cannot emit before setting section!");
244 OS << *Symbol << MAI.getLabelSuffix();
246 Symbol->setSection(*CurSection);
249 void PTXMCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {}
251 void PTXMCAsmStreamer::EmitThumbFunc(MCSymbol *Func) {}
253 void PTXMCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
254 OS << *Symbol << " = " << *Value;
257 // FIXME: Lift context changes into super class.
258 Symbol->setVariableValue(Value);
261 void PTXMCAsmStreamer::EmitWeakReference(MCSymbol *Alias,
262 const MCSymbol *Symbol) {
263 OS << ".weakref " << *Alias << ", " << *Symbol;
267 void PTXMCAsmStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
268 const MCSymbol *LastLabel,
269 const MCSymbol *Label) {
270 report_fatal_error("Unimplemented.");
273 void PTXMCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
274 MCSymbolAttr Attribute) {}
276 void PTXMCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
278 void PTXMCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {}
280 void PTXMCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {}
282 void PTXMCAsmStreamer::EmitCOFFSymbolType (int Type) {}
284 void PTXMCAsmStreamer::EndCOFFSymbolDef() {}
286 void PTXMCAsmStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
288 void PTXMCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
289 unsigned ByteAlignment) {}
291 void PTXMCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {}
293 void PTXMCAsmStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
294 unsigned Size, unsigned ByteAlignment) {}
296 void PTXMCAsmStreamer::EmitTBSSSymbol(const MCSection *Section,
298 uint64_t Size, unsigned ByteAlignment) {}
300 static inline char toOctal(int X) { return (X&7)+'0'; }
302 static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
305 for (unsigned i = 0, e = Data.size(); i != e; ++i) {
306 unsigned char C = Data[i];
307 if (C == '"' || C == '\\') {
308 OS << '\\' << (char)C;
312 if (isprint((unsigned char)C)) {
318 case '\b': OS << "\\b"; break;
319 case '\f': OS << "\\f"; break;
320 case '\n': OS << "\\n"; break;
321 case '\r': OS << "\\r"; break;
322 case '\t': OS << "\\t"; break;
325 OS << toOctal(C >> 6);
326 OS << toOctal(C >> 3);
327 OS << toOctal(C >> 0);
335 void PTXMCAsmStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
336 assert(CurSection && "Cannot emit contents before setting section!");
337 if (Data.empty()) return;
339 if (Data.size() == 1) {
340 OS << MAI.getData8bitsDirective(AddrSpace);
341 OS << (unsigned)(unsigned char)Data[0];
346 // If the data ends with 0 and the target supports .asciz, use it, otherwise
348 if (MAI.getAscizDirective() && Data.back() == 0) {
349 OS << MAI.getAscizDirective();
350 Data = Data.substr(0, Data.size()-1);
352 OS << MAI.getAsciiDirective();
356 PrintQuotedString(Data, OS);
360 void PTXMCAsmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
361 bool isPCRel, unsigned AddrSpace) {
362 assert(CurSection && "Cannot emit contents before setting section!");
363 assert(!isPCRel && "Cannot emit pc relative relocations!");
364 const char *Directive = 0;
367 case 1: Directive = MAI.getData8bitsDirective(AddrSpace); break;
368 case 2: Directive = MAI.getData16bitsDirective(AddrSpace); break;
369 case 4: Directive = MAI.getData32bitsDirective(AddrSpace); break;
371 Directive = MAI.getData64bitsDirective(AddrSpace);
372 // If the target doesn't support 64-bit data, emit as two 32-bit halves.
373 if (Directive) break;
375 if (!Value->EvaluateAsAbsolute(IntValue))
376 report_fatal_error("Don't know how to emit this value.");
377 if (getContext().getTargetAsmInfo().isLittleEndian()) {
378 EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
379 EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
381 EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
382 EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
387 assert(Directive && "Invalid size for machine code value!");
388 OS << Directive << *Value;
392 void PTXMCAsmStreamer::EmitULEB128Value(const MCExpr *Value,
393 unsigned AddrSpace) {
394 assert(MAI.hasLEB128() && "Cannot print a .uleb");
395 OS << ".uleb128 " << *Value;
399 void PTXMCAsmStreamer::EmitSLEB128Value(const MCExpr *Value,
400 unsigned AddrSpace) {
401 assert(MAI.hasLEB128() && "Cannot print a .sleb");
402 OS << ".sleb128 " << *Value;
406 void PTXMCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
407 assert(MAI.getGPRel32Directive() != 0);
408 OS << MAI.getGPRel32Directive() << *Value;
413 /// EmitFill - Emit NumBytes bytes worth of the value specified by
414 /// FillValue. This implements directives such as '.space'.
415 void PTXMCAsmStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
416 unsigned AddrSpace) {
417 if (NumBytes == 0) return;
420 if (const char *ZeroDirective = MAI.getZeroDirective()) {
421 OS << ZeroDirective << NumBytes;
423 OS << ',' << (int)FillValue;
428 // Emit a byte at a time.
429 MCStreamer::EmitFill(NumBytes, FillValue, AddrSpace);
432 void PTXMCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
434 unsigned MaxBytesToEmit) {
435 // Some assemblers don't support non-power of two alignments, so we always
436 // emit alignments as a power of two if possible.
437 if (isPowerOf2_32(ByteAlignment)) {
439 default: llvm_unreachable("Invalid size for machine code value!");
440 case 1: OS << MAI.getAlignDirective(); break;
441 // FIXME: use MAI for this!
442 case 2: OS << ".p2alignw "; break;
443 case 4: OS << ".p2alignl "; break;
444 case 8: llvm_unreachable("Unsupported alignment size!");
447 if (MAI.getAlignmentIsInBytes())
450 OS << Log2_32(ByteAlignment);
452 if (Value || MaxBytesToEmit) {
454 OS.write_hex(truncateToSize(Value, ValueSize));
457 OS << ", " << MaxBytesToEmit;
463 // Non-power of two alignment. This is not widely supported by assemblers.
464 // FIXME: Parameterize this based on MAI.
466 default: llvm_unreachable("Invalid size for machine code value!");
467 case 1: OS << ".balign"; break;
468 case 2: OS << ".balignw"; break;
469 case 4: OS << ".balignl"; break;
470 case 8: llvm_unreachable("Unsupported alignment size!");
473 OS << ' ' << ByteAlignment;
474 OS << ", " << truncateToSize(Value, ValueSize);
476 OS << ", " << MaxBytesToEmit;
480 void PTXMCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
481 unsigned MaxBytesToEmit) {}
483 void PTXMCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
484 unsigned char Value) {}
487 void PTXMCAsmStreamer::EmitFileDirective(StringRef Filename) {
488 assert(MAI.hasSingleParameterDotFile());
490 PrintQuotedString(Filename, OS);
494 // FIXME: should we inherit from MCAsmStreamer?
495 bool PTXMCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo,
497 OS << "\t.file\t" << FileNo << ' ';
498 PrintQuotedString(Filename, OS);
500 return this->MCStreamer::EmitDwarfFileDirective(FileNo, Filename);
503 void PTXMCAsmStreamer::AddEncodingComment(const MCInst &Inst) {}
505 void PTXMCAsmStreamer::EmitInstruction(const MCInst &Inst) {
506 assert(CurSection && "Cannot emit contents before setting section!");
508 // Show the encoding in a comment if we have a code emitter.
510 AddEncodingComment(Inst);
512 // Show the MCInst if enabled.
514 Inst.dump_pretty(GetCommentOS(), &MAI, InstPrinter.get(), "\n ");
515 GetCommentOS() << "\n";
518 // If we have an AsmPrinter, use that to print, otherwise print the MCInst.
520 InstPrinter->printInst(&Inst, OS);
522 Inst.print(OS, &MAI);
526 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
527 /// the specified string in the output .s file. This capability is
528 /// indicated by the hasRawTextSupport() predicate.
529 void PTXMCAsmStreamer::EmitRawText(StringRef String) {
530 if (!String.empty() && String.back() == '\n')
531 String = String.substr(0, String.size()-1);
536 void PTXMCAsmStreamer::Finish() {}
539 MCStreamer *createPTXAsmStreamer(MCContext &Context,
540 formatted_raw_ostream &OS,
541 bool isVerboseAsm, bool useLoc,
543 MCCodeEmitter *CE, TargetAsmBackend *TAB,
545 return new PTXMCAsmStreamer(Context, OS, isVerboseAsm, useLoc,