1 //===- MCStreamer.h - High-level Streaming Machine Code Output --*- C++ -*-===//
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 declares the MCStreamer class.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_MC_MCSTREAMER_H
15 #define LLVM_MC_MCSTREAMER_H
17 #include "llvm/ADT/ArrayRef.h"
18 #include "llvm/ADT/SmallVector.h"
19 #include "llvm/MC/MCAssembler.h"
20 #include "llvm/MC/MCDirectives.h"
21 #include "llvm/MC/MCDwarf.h"
22 #include "llvm/MC/MCWin64EH.h"
23 #include "llvm/Support/DataTypes.h"
36 class MCSymbolRefExpr;
37 class MCSubtargetInfo;
41 class formatted_raw_ostream;
42 class AssemblerConstantPools;
44 typedef std::pair<const MCSection *, const MCExpr *> MCSectionSubPair;
46 /// Target specific streamer interface. This is used so that targets can
47 /// implement support for target specific assembly directives.
49 /// If target foo wants to use this, it should implement 3 classes:
50 /// * FooTargetStreamer : public MCTargetStreamer
51 /// * FooTargetAsmSreamer : public FooTargetStreamer
52 /// * FooTargetELFStreamer : public FooTargetStreamer
54 /// FooTargetStreamer should have a pure virtual method for each directive. For
55 /// example, for a ".bar symbol_name" directive, it should have
56 /// virtual emitBar(const MCSymbol &Symbol) = 0;
58 /// The FooTargetAsmSreamer and FooTargetELFStreamer classes implement the
59 /// method. The assembly streamer just prints ".bar symbol_name". The object
60 /// streamer does whatever is needed to implement .bar in the object file.
62 /// In the assembly printer and parser the target streamer can be used by
63 /// calling getTargetStreamer and casting it to FooTargetStreamer:
65 /// MCTargetStreamer &TS = OutStreamer.getTargetStreamer();
66 /// FooTargetStreamer &ATS = static_cast<FooTargetStreamer &>(TS);
68 /// The base classes FooTargetAsmSreamer and FooTargetELFStreamer should *never*
69 /// be treated differently. Callers should always talk to a FooTargetStreamer.
70 class MCTargetStreamer {
75 MCTargetStreamer(MCStreamer &S);
76 virtual ~MCTargetStreamer();
78 const MCStreamer &getStreamer() { return Streamer; }
80 // Allow a target to add behavior to the EmitLabel of MCStreamer.
81 virtual void emitLabel(MCSymbol *Symbol);
83 virtual void finish();
86 // FIXME: declared here because it is used from
87 // lib/CodeGen/AsmPrinter/ARMException.cpp.
88 class ARMTargetStreamer : public MCTargetStreamer {
90 ARMTargetStreamer(MCStreamer &S);
93 virtual void emitFnStart();
94 virtual void emitFnEnd();
95 virtual void emitCantUnwind();
96 virtual void emitPersonality(const MCSymbol *Personality);
97 virtual void emitPersonalityIndex(unsigned Index);
98 virtual void emitHandlerData();
99 virtual void emitSetFP(unsigned FpReg, unsigned SpReg,
101 virtual void emitMovSP(unsigned Reg, int64_t Offset = 0);
102 virtual void emitPad(int64_t Offset);
103 virtual void emitRegSave(const SmallVectorImpl<unsigned> &RegList,
105 virtual void emitUnwindRaw(int64_t StackOffset,
106 const SmallVectorImpl<uint8_t> &Opcodes);
108 virtual void switchVendor(StringRef Vendor);
109 virtual void emitAttribute(unsigned Attribute, unsigned Value);
110 virtual void emitTextAttribute(unsigned Attribute, StringRef String);
111 virtual void emitIntTextAttribute(unsigned Attribute, unsigned IntValue,
112 StringRef StringValue = "");
113 virtual void emitFPU(unsigned FPU);
114 virtual void emitArch(unsigned Arch);
115 virtual void emitObjectArch(unsigned Arch);
116 virtual void finishAttributeSection();
117 virtual void emitInst(uint32_t Inst, char Suffix = '\0');
119 virtual void AnnotateTLSDescriptorSequence(const MCSymbolRefExpr *SRE);
121 void finish() override;
123 /// Callback used to implement the ldr= pseudo.
124 /// Add a new entry to the constant pool for the current section and return an
125 /// MCExpr that can be used to refer to the constant pool location.
126 const MCExpr *addConstantPoolEntry(const MCExpr *);
128 /// Callback used to implemnt the .ltorg directive.
129 /// Emit contents of constant pool for the current section.
130 void emitCurrentConstantPool();
133 std::unique_ptr<AssemblerConstantPools> ConstantPools;
136 /// MCStreamer - Streaming machine code generation interface. This interface
137 /// is intended to provide a programatic interface that is very similar to the
138 /// level that an assembler .s file provides. It has callbacks to emit bytes,
139 /// handle directives, etc. The implementation of this interface retains
140 /// state to know what the current section is etc.
142 /// There are multiple implementations of this interface: one for writing out
143 /// a .s file, and implementations that write out .o files of various formats.
147 std::unique_ptr<MCTargetStreamer> TargetStreamer;
149 MCStreamer(const MCStreamer &) LLVM_DELETED_FUNCTION;
150 MCStreamer &operator=(const MCStreamer &) LLVM_DELETED_FUNCTION;
155 std::vector<MCDwarfFrameInfo> FrameInfos;
156 MCDwarfFrameInfo *getCurrentFrameInfo();
157 MCSymbol *EmitCFICommon();
158 void EnsureValidFrame();
160 std::vector<MCWin64EHUnwindInfo *> W64UnwindInfos;
161 MCWin64EHUnwindInfo *CurrentW64UnwindInfo;
162 void setCurrentW64UnwindInfo(MCWin64EHUnwindInfo *Frame);
163 void EnsureValidW64UnwindInfo();
165 MCSymbol *LastSymbol;
167 // SymbolOrdering - Tracks an index to represent the order
168 // a symbol was emitted in. Zero means we did not emit that symbol.
169 DenseMap<const MCSymbol *, unsigned> SymbolOrdering;
171 /// SectionStack - This is stack of current and previous section
172 /// values saved by PushSection.
173 SmallVector<std::pair<MCSectionSubPair, MCSectionSubPair>, 4> SectionStack;
176 MCStreamer(MCContext &Ctx);
178 const MCExpr *BuildSymbolDiff(MCContext &Context, const MCSymbol *A,
181 const MCExpr *ForceExpAbs(const MCExpr *Expr);
183 void RecordProcStart(MCDwarfFrameInfo &Frame);
184 virtual void EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame);
185 void RecordProcEnd(MCDwarfFrameInfo &Frame);
186 virtual void EmitCFIEndProcImpl(MCDwarfFrameInfo &CurFrame);
187 void EmitFrames(MCAsmBackend *MAB, bool usingCFI);
189 MCWin64EHUnwindInfo *getCurrentW64UnwindInfo() {
190 return CurrentW64UnwindInfo;
192 void EmitW64Tables();
194 virtual void EmitRawTextImpl(StringRef String);
197 virtual ~MCStreamer();
199 void setTargetStreamer(MCTargetStreamer *TS) {
200 TargetStreamer.reset(TS);
205 virtual void reset();
207 MCContext &getContext() const { return Context; }
209 MCTargetStreamer *getTargetStreamer() {
210 return TargetStreamer.get();
213 unsigned getNumFrameInfos() { return FrameInfos.size(); }
215 const MCDwarfFrameInfo &getFrameInfo(unsigned i) { return FrameInfos[i]; }
217 ArrayRef<MCDwarfFrameInfo> getFrameInfos() const { return FrameInfos; }
219 unsigned getNumW64UnwindInfos() { return W64UnwindInfos.size(); }
221 MCWin64EHUnwindInfo &getW64UnwindInfo(unsigned i) {
222 return *W64UnwindInfos[i];
225 void generateCompactUnwindEncodings(MCAsmBackend *MAB);
227 /// @name Assembly File Formatting.
230 /// isVerboseAsm - Return true if this streamer supports verbose assembly
231 /// and if it is enabled.
232 virtual bool isVerboseAsm() const { return false; }
234 /// hasRawTextSupport - Return true if this asm streamer supports emitting
235 /// unformatted text to the .s file with EmitRawText.
236 virtual bool hasRawTextSupport() const { return false; }
238 /// Is the integrated assembler required for this streamer to function
240 virtual bool isIntegratedAssemblerRequired() const { return false; }
242 /// AddComment - Add a comment that can be emitted to the generated .s
243 /// file if applicable as a QoI issue to make the output of the compiler
244 /// more readable. This only affects the MCAsmStreamer, and only when
245 /// verbose assembly output is enabled.
247 /// If the comment includes embedded \n's, they will each get the comment
248 /// prefix as appropriate. The added comment should not end with a \n.
249 virtual void AddComment(const Twine &T) {}
251 /// GetCommentOS - Return a raw_ostream that comments can be written to.
252 /// Unlike AddComment, you are required to terminate comments with \n if you
254 virtual raw_ostream &GetCommentOS();
256 /// Print T and prefix it with the comment string (normally #) and optionally
257 /// a tab. This prints the comment immediately, not at the end of the
258 /// current line. It is basically a safe version of EmitRawText: since it
259 /// only prints comments, the object streamer ignores it instead of asserting.
260 virtual void emitRawComment(const Twine &T, bool TabPrefix = true);
262 /// AddBlankLine - Emit a blank line to a .s file to pretty it up.
263 virtual void AddBlankLine() {}
267 /// @name Symbol & Section Management
270 /// getCurrentSection - Return the current section that the streamer is
271 /// emitting code to.
272 MCSectionSubPair getCurrentSection() const {
273 if (!SectionStack.empty())
274 return SectionStack.back().first;
275 return MCSectionSubPair();
278 /// getPreviousSection - Return the previous section that the streamer is
279 /// emitting code to.
280 MCSectionSubPair getPreviousSection() const {
281 if (!SectionStack.empty())
282 return SectionStack.back().second;
283 return MCSectionSubPair();
286 /// GetSymbolOrder - Returns an index to represent the order
287 /// a symbol was emitted in. (zero if we did not emit that symbol)
288 unsigned GetSymbolOrder(const MCSymbol *Sym) const {
289 return SymbolOrdering.lookup(Sym);
292 /// ChangeSection - Update streamer for a new active section.
294 /// This is called by PopSection and SwitchSection, if the current
296 virtual void ChangeSection(const MCSection *, const MCExpr *) = 0;
298 /// pushSection - Save the current and previous section on the
301 SectionStack.push_back(
302 std::make_pair(getCurrentSection(), getPreviousSection()));
305 /// popSection - Restore the current and previous section from
306 /// the section stack. Calls ChangeSection as needed.
308 /// Returns false if the stack was empty.
310 if (SectionStack.size() <= 1)
312 MCSectionSubPair oldSection = SectionStack.pop_back_val().first;
313 MCSectionSubPair curSection = SectionStack.back().first;
315 if (oldSection != curSection)
316 ChangeSection(curSection.first, curSection.second);
320 bool SubSection(const MCExpr *Subsection) {
321 if (SectionStack.empty())
324 SwitchSection(SectionStack.back().first.first, Subsection);
328 /// SwitchSection - Set the current section where code is being emitted to
329 /// @p Section. This is required to update CurSection.
331 /// This corresponds to assembler directives like .section, .text, etc.
332 void SwitchSection(const MCSection *Section, const MCExpr *Subsection = 0) {
333 assert(Section && "Cannot switch to a null section!");
334 MCSectionSubPair curSection = SectionStack.back().first;
335 SectionStack.back().second = curSection;
336 if (MCSectionSubPair(Section, Subsection) != curSection) {
337 SectionStack.back().first = MCSectionSubPair(Section, Subsection);
338 ChangeSection(Section, Subsection);
342 /// SwitchSectionNoChange - Set the current section where code is being
343 /// emitted to @p Section. This is required to update CurSection. This
344 /// version does not call ChangeSection.
345 void SwitchSectionNoChange(const MCSection *Section,
346 const MCExpr *Subsection = 0) {
347 assert(Section && "Cannot switch to a null section!");
348 MCSectionSubPair curSection = SectionStack.back().first;
349 SectionStack.back().second = curSection;
350 if (MCSectionSubPair(Section, Subsection) != curSection)
351 SectionStack.back().first = MCSectionSubPair(Section, Subsection);
354 /// Create the default sections and set the initial one.
355 virtual void InitSections();
357 /// AssignSection - Sets the symbol's section.
359 /// Each emitted symbol will be tracked in the ordering table,
360 /// so we can sort on them later.
361 void AssignSection(MCSymbol *Symbol, const MCSection *Section);
363 /// EmitLabel - Emit a label for @p Symbol into the current section.
365 /// This corresponds to an assembler statement such as:
368 /// @param Symbol - The symbol to emit. A given symbol should only be
369 /// emitted as a label once, and symbols emitted as a label should never be
370 /// used in an assignment.
371 // FIXME: These emission are non-const because we mutate the symbol to
372 // add the section we're emitting it to later.
373 virtual void EmitLabel(MCSymbol *Symbol);
375 virtual void EmitDebugLabel(MCSymbol *Symbol);
377 virtual void EmitEHSymAttributes(const MCSymbol *Symbol, MCSymbol *EHSymbol);
379 /// EmitAssemblerFlag - Note in the output the specified @p Flag.
380 virtual void EmitAssemblerFlag(MCAssemblerFlag Flag) = 0;
382 /// EmitLinkerOptions - Emit the given list @p Options of strings as linker
383 /// options into the output.
384 virtual void EmitLinkerOptions(ArrayRef<std::string> Kind) {}
386 /// EmitDataRegion - Note in the output the specified region @p Kind.
387 virtual void EmitDataRegion(MCDataRegionType Kind) {}
389 /// EmitVersionMin - Specify the MachO minimum deployment target version.
390 virtual void EmitVersionMin(MCVersionMinType, unsigned Major, unsigned Minor,
393 /// EmitThumbFunc - Note in the output that the specified @p Func is
394 /// a Thumb mode function (ARM target only).
395 virtual void EmitThumbFunc(MCSymbol *Func) = 0;
397 /// getOrCreateSymbolData - Get symbol data for given symbol.
398 virtual MCSymbolData &getOrCreateSymbolData(MCSymbol *Symbol);
400 /// EmitAssignment - Emit an assignment of @p Value to @p Symbol.
402 /// This corresponds to an assembler statement such as:
405 /// The assignment generates no code, but has the side effect of binding the
406 /// value in the current context. For the assembly streamer, this prints the
407 /// binding into the .s file.
409 /// @param Symbol - The symbol being assigned to.
410 /// @param Value - The value for the symbol.
411 virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) = 0;
413 /// EmitWeakReference - Emit an weak reference from @p Alias to @p Symbol.
415 /// This corresponds to an assembler statement such as:
416 /// .weakref alias, symbol
418 /// @param Alias - The alias that is being created.
419 /// @param Symbol - The symbol being aliased.
420 virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) = 0;
422 /// EmitSymbolAttribute - Add the given @p Attribute to @p Symbol.
423 virtual bool EmitSymbolAttribute(MCSymbol *Symbol,
424 MCSymbolAttr Attribute) = 0;
426 /// EmitSymbolDesc - Set the @p DescValue for the @p Symbol.
428 /// @param Symbol - The symbol to have its n_desc field set.
429 /// @param DescValue - The value to set into the n_desc field.
430 virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) = 0;
432 /// BeginCOFFSymbolDef - Start emitting COFF symbol definition
434 /// @param Symbol - The symbol to have its External & Type fields set.
435 virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) = 0;
437 /// EmitCOFFSymbolStorageClass - Emit the storage class of the symbol.
439 /// @param StorageClass - The storage class the symbol should have.
440 virtual void EmitCOFFSymbolStorageClass(int StorageClass) = 0;
442 /// EmitCOFFSymbolType - Emit the type of the symbol.
444 /// @param Type - A COFF type identifier (see COFF::SymbolType in X86COFF.h)
445 virtual void EmitCOFFSymbolType(int Type) = 0;
447 /// EndCOFFSymbolDef - Marks the end of the symbol definition.
448 virtual void EndCOFFSymbolDef() = 0;
450 /// EmitCOFFSectionIndex - Emits a COFF section index.
452 /// @param Symbol - Symbol the section number relocation should point to.
453 virtual void EmitCOFFSectionIndex(MCSymbol const *Symbol);
455 /// EmitCOFFSecRel32 - Emits a COFF section relative relocation.
457 /// @param Symbol - Symbol the section relative relocation should point to.
458 virtual void EmitCOFFSecRel32(MCSymbol const *Symbol);
460 /// EmitELFSize - Emit an ELF .size directive.
462 /// This corresponds to an assembler statement such as:
463 /// .size symbol, expression
465 virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) = 0;
467 /// EmitCommonSymbol - Emit a common symbol.
469 /// @param Symbol - The common symbol to emit.
470 /// @param Size - The size of the common symbol.
471 /// @param ByteAlignment - The alignment of the symbol if
472 /// non-zero. This must be a power of 2.
473 virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
474 unsigned ByteAlignment) = 0;
476 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
478 /// @param Symbol - The common symbol to emit.
479 /// @param Size - The size of the common symbol.
480 /// @param ByteAlignment - The alignment of the common symbol in bytes.
481 virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
482 unsigned ByteAlignment) = 0;
484 /// EmitZerofill - Emit the zerofill section and an optional symbol.
486 /// @param Section - The zerofill section to create and or to put the symbol
487 /// @param Symbol - The zerofill symbol to emit, if non-NULL.
488 /// @param Size - The size of the zerofill symbol.
489 /// @param ByteAlignment - The alignment of the zerofill symbol if
490 /// non-zero. This must be a power of 2 on some targets.
491 virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
492 uint64_t Size = 0, unsigned ByteAlignment = 0) = 0;
494 /// EmitTBSSSymbol - Emit a thread local bss (.tbss) symbol.
496 /// @param Section - The thread local common section.
497 /// @param Symbol - The thread local common symbol to emit.
498 /// @param Size - The size of the symbol.
499 /// @param ByteAlignment - The alignment of the thread local common symbol
500 /// if non-zero. This must be a power of 2 on some targets.
501 virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
502 uint64_t Size, unsigned ByteAlignment = 0) = 0;
505 /// @name Generating Data
508 /// EmitBytes - Emit the bytes in \p Data into the output.
510 /// This is used to implement assembler directives such as .byte, .ascii,
512 virtual void EmitBytes(StringRef Data) = 0;
514 /// EmitValue - Emit the expression @p Value into the output as a native
515 /// integer of the given @p Size bytes.
517 /// This is used to implement assembler directives such as .word, .quad,
520 /// @param Value - The value to emit.
521 /// @param Size - The size of the integer (in bytes) to emit. This must
522 /// match a native machine width.
523 virtual void EmitValueImpl(const MCExpr *Value, unsigned Size) = 0;
525 void EmitValue(const MCExpr *Value, unsigned Size);
527 /// EmitIntValue - Special case of EmitValue that avoids the client having
528 /// to pass in a MCExpr for constant integers.
529 virtual void EmitIntValue(uint64_t Value, unsigned Size);
531 /// EmitAbsValue - Emit the Value, but try to avoid relocations. On MachO
532 /// this is done by producing
535 void EmitAbsValue(const MCExpr *Value, unsigned Size);
537 virtual void EmitULEB128Value(const MCExpr *Value) = 0;
539 virtual void EmitSLEB128Value(const MCExpr *Value) = 0;
541 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
542 /// client having to pass in a MCExpr for constant integers.
543 void EmitULEB128IntValue(uint64_t Value, unsigned Padding = 0);
545 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
546 /// client having to pass in a MCExpr for constant integers.
547 void EmitSLEB128IntValue(int64_t Value);
549 /// EmitSymbolValue - Special case of EmitValue that avoids the client
550 /// having to pass in a MCExpr for MCSymbols.
551 void EmitSymbolValue(const MCSymbol *Sym, unsigned Size);
553 /// EmitGPRel64Value - Emit the expression @p Value into the output as a
554 /// gprel64 (64-bit GP relative) value.
556 /// This is used to implement assembler directives such as .gpdword on
557 /// targets that support them.
558 virtual void EmitGPRel64Value(const MCExpr *Value);
560 /// EmitGPRel32Value - Emit the expression @p Value into the output as a
561 /// gprel32 (32-bit GP relative) value.
563 /// This is used to implement assembler directives such as .gprel32 on
564 /// targets that support them.
565 virtual void EmitGPRel32Value(const MCExpr *Value);
567 /// EmitFill - Emit NumBytes bytes worth of the value specified by
568 /// FillValue. This implements directives such as '.space'.
569 virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue);
571 /// \brief Emit NumBytes worth of zeros.
572 /// This function properly handles data in virtual sections.
573 virtual void EmitZeros(uint64_t NumBytes);
575 /// EmitValueToAlignment - Emit some number of copies of @p Value until
576 /// the byte alignment @p ByteAlignment is reached.
578 /// If the number of bytes need to emit for the alignment is not a multiple
579 /// of @p ValueSize, then the contents of the emitted fill bytes is
582 /// This used to implement the .align assembler directive.
584 /// @param ByteAlignment - The alignment to reach. This must be a power of
585 /// two on some targets.
586 /// @param Value - The value to use when filling bytes.
587 /// @param ValueSize - The size of the integer (in bytes) to emit for
588 /// @p Value. This must match a native machine width.
589 /// @param MaxBytesToEmit - The maximum numbers of bytes to emit, or 0. If
590 /// the alignment cannot be reached in this many bytes, no bytes are
592 virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
593 unsigned ValueSize = 1,
594 unsigned MaxBytesToEmit = 0) = 0;
596 /// EmitCodeAlignment - Emit nops until the byte alignment @p ByteAlignment
599 /// This used to align code where the alignment bytes may be executed. This
600 /// can emit different bytes for different sizes to optimize execution.
602 /// @param ByteAlignment - The alignment to reach. This must be a power of
603 /// two on some targets.
604 /// @param MaxBytesToEmit - The maximum numbers of bytes to emit, or 0. If
605 /// the alignment cannot be reached in this many bytes, no bytes are
607 virtual void EmitCodeAlignment(unsigned ByteAlignment,
608 unsigned MaxBytesToEmit = 0) = 0;
610 /// EmitValueToOffset - Emit some number of copies of @p Value until the
611 /// byte offset @p Offset is reached.
613 /// This is used to implement assembler directives such as .org.
615 /// @param Offset - The offset to reach. This may be an expression, but the
616 /// expression must be associated with the current section.
617 /// @param Value - The value to use when filling bytes.
618 /// @return false on success, true if the offset was invalid.
619 virtual bool EmitValueToOffset(const MCExpr *Offset,
620 unsigned char Value = 0) = 0;
624 /// EmitFileDirective - Switch to a new logical file. This is used to
625 /// implement the '.file "foo.c"' assembler directive.
626 virtual void EmitFileDirective(StringRef Filename) = 0;
628 /// Emit the "identifiers" directive. This implements the
629 /// '.ident "version foo"' assembler directive.
630 virtual void EmitIdent(StringRef IdentString) {}
632 /// EmitDwarfFileDirective - Associate a filename with a specified logical
633 /// file number. This implements the DWARF2 '.file 4 "foo.c"' assembler
635 virtual unsigned EmitDwarfFileDirective(unsigned FileNo, StringRef Directory,
639 /// EmitDwarfLocDirective - This implements the DWARF2
640 // '.loc fileno lineno ...' assembler directive.
641 virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
642 unsigned Column, unsigned Flags,
643 unsigned Isa, unsigned Discriminator,
646 virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
647 const MCSymbol *LastLabel,
648 const MCSymbol *Label,
649 unsigned PointerSize) = 0;
651 virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
652 const MCSymbol *Label) {}
654 void EmitDwarfSetLineAddr(int64_t LineDelta, const MCSymbol *Label,
657 virtual void EmitCompactUnwindEncoding(uint32_t CompactUnwindEncoding);
658 virtual void EmitCFISections(bool EH, bool Debug);
659 void EmitCFIStartProc(bool IsSimple);
660 void EmitCFIEndProc();
661 virtual void EmitCFIDefCfa(int64_t Register, int64_t Offset);
662 virtual void EmitCFIDefCfaOffset(int64_t Offset);
663 virtual void EmitCFIDefCfaRegister(int64_t Register);
664 virtual void EmitCFIOffset(int64_t Register, int64_t Offset);
665 virtual void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding);
666 virtual void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding);
667 virtual void EmitCFIRememberState();
668 virtual void EmitCFIRestoreState();
669 virtual void EmitCFISameValue(int64_t Register);
670 virtual void EmitCFIRestore(int64_t Register);
671 virtual void EmitCFIRelOffset(int64_t Register, int64_t Offset);
672 virtual void EmitCFIAdjustCfaOffset(int64_t Adjustment);
673 virtual void EmitCFIEscape(StringRef Values);
674 virtual void EmitCFISignalFrame();
675 virtual void EmitCFIUndefined(int64_t Register);
676 virtual void EmitCFIRegister(int64_t Register1, int64_t Register2);
677 virtual void EmitCFIWindowSave();
679 virtual void EmitWin64EHStartProc(const MCSymbol *Symbol);
680 virtual void EmitWin64EHEndProc();
681 virtual void EmitWin64EHStartChained();
682 virtual void EmitWin64EHEndChained();
683 virtual void EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
685 virtual void EmitWin64EHHandlerData();
686 virtual void EmitWin64EHPushReg(unsigned Register);
687 virtual void EmitWin64EHSetFrame(unsigned Register, unsigned Offset);
688 virtual void EmitWin64EHAllocStack(unsigned Size);
689 virtual void EmitWin64EHSaveReg(unsigned Register, unsigned Offset);
690 virtual void EmitWin64EHSaveXMM(unsigned Register, unsigned Offset);
691 virtual void EmitWin64EHPushFrame(bool Code);
692 virtual void EmitWin64EHEndProlog();
694 /// EmitInstruction - Emit the given @p Instruction into the current
696 virtual void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) = 0;
698 /// \brief Set the bundle alignment mode from now on in the section.
699 /// The argument is the power of 2 to which the alignment is set. The
700 /// value 0 means turn the bundle alignment off.
701 virtual void EmitBundleAlignMode(unsigned AlignPow2) = 0;
703 /// \brief The following instructions are a bundle-locked group.
705 /// \param AlignToEnd - If true, the bundle-locked group will be aligned to
706 /// the end of a bundle.
707 virtual void EmitBundleLock(bool AlignToEnd) = 0;
709 /// \brief Ends a bundle-locked group.
710 virtual void EmitBundleUnlock() = 0;
712 /// EmitRawText - If this file is backed by a assembly streamer, this dumps
713 /// the specified string in the output .s file. This capability is
714 /// indicated by the hasRawTextSupport() predicate. By default this aborts.
715 void EmitRawText(const Twine &String);
717 /// Flush - Causes any cached state to be written out.
718 virtual void Flush() {}
720 /// FinishImpl - Streamer specific finalization.
721 virtual void FinishImpl() = 0;
722 /// Finish - Finish emission of machine code.
726 /// createNullStreamer - Create a dummy machine code streamer, which does
727 /// nothing. This is useful for timing the assembler front end.
728 MCStreamer *createNullStreamer(MCContext &Ctx);
730 /// createAsmStreamer - Create a machine code streamer which will print out
731 /// assembly for the native target, suitable for compiling with a native
734 /// \param InstPrint - If given, the instruction printer to use. If not given
735 /// the MCInst representation will be printed. This method takes ownership of
738 /// \param CE - If given, a code emitter to use to show the instruction
739 /// encoding inline with the assembly. This method takes ownership of \p CE.
741 /// \param TAB - If given, a target asm backend to use to show the fixup
742 /// information in conjunction with encoding information. This method takes
743 /// ownership of \p TAB.
745 /// \param ShowInst - Whether to show the MCInst representation inline with
747 MCStreamer *createAsmStreamer(MCContext &Ctx, formatted_raw_ostream &OS,
748 bool isVerboseAsm, bool useCFI,
749 bool useDwarfDirectory, MCInstPrinter *InstPrint,
750 MCCodeEmitter *CE, MCAsmBackend *TAB,
753 /// createMachOStreamer - Create a machine code streamer which will generate
754 /// Mach-O format object files.
756 /// Takes ownership of \p TAB and \p CE.
757 MCStreamer *createMachOStreamer(MCContext &Ctx, MCAsmBackend &TAB,
758 raw_ostream &OS, MCCodeEmitter *CE,
759 bool RelaxAll = false);
761 /// createWinCOFFStreamer - Create a machine code streamer which will
762 /// generate Microsoft COFF format object files.
764 /// Takes ownership of \p TAB and \p CE.
765 MCStreamer *createWinCOFFStreamer(MCContext &Ctx, MCAsmBackend &TAB,
766 MCCodeEmitter &CE, raw_ostream &OS,
767 bool RelaxAll = false);
769 /// createELFStreamer - Create a machine code streamer which will generate
770 /// ELF format object files.
771 MCStreamer *createELFStreamer(MCContext &Ctx, MCAsmBackend &TAB,
772 raw_ostream &OS, MCCodeEmitter *CE, bool RelaxAll,
775 } // end namespace llvm