1 //===-- llvm/Target/TargetAsmInfo.h - Asm info ------------------*- 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 contains a class to be used as the basis for target specific
11 // asm writers. This class primarily takes care of global printing constants,
12 // which are used in very similar ways across all targets.
14 //===----------------------------------------------------------------------===//
16 #ifndef LLVM_TARGET_ASM_INFO_H
17 #define LLVM_TARGET_ASM_INFO_H
19 #include "llvm/ADT/DenseMap.h"
20 #include "llvm/ADT/StringMap.h"
21 #include "llvm/Support/DataTypes.h"
25 // DWARF encoding query type
26 namespace DwarfEncoding {
34 /// SectionKind - This is a simple POD value that classifies the properties of
35 /// a section. A global variable is classified into the deepest possible
36 /// classification, and then the target maps them onto their sections based on
37 /// what capabilities they have.
39 /// The comments below describe these as if they were an inheritance hierarchy
40 /// in order to explain the predicates below.
43 /// Text - Text section, used for functions and other executable code.
46 /// ReadOnly - Data that is never written to at program runtime by the
47 /// program or the dynamic linker. Things in the top-level readonly
48 /// SectionKind are not mergeable.
51 /// MergeableCString - This is a special section for nul-terminated
52 /// strings. The linker can unique the C strings, knowing their
53 /// semantics. Because it uniques based on the nul terminators, the
54 /// compiler can't put strings in this section that have embeded nuls
58 /// MergeableConst - These are sections for merging fixed-length
59 /// constants together. For example, this can be used to unique
60 /// constant pool entries etc.
63 /// MergeableConst4 - This is a section used by 4-byte constants,
64 /// for example, floats.
67 /// MergeableConst8 - This is a section used by 8-byte constants,
68 /// for example, doubles.
71 /// MergeableConst16 - This is a section used by 16-byte constants,
72 /// for example, vectors.
75 /// Writeable - This is the base of all segments that need to be written
76 /// to during program runtime.
78 /// ThreadLocal - This is the base of all TLS segments. All TLS
79 /// objects must be writeable, otherwise there is no reason for them to
82 /// ThreadBSS - Zero-initialized TLS data objects.
85 /// ThreadData - Initialized TLS data objects.
88 /// GlobalWriteableData - Writeable data that is global (not thread
91 /// BSS - Zero initialized writeable data.
94 /// DataRel - This is the most general form of data that is written
95 /// to by the program, it can have random relocations to arbitrary
99 /// DataRelLocal - This is writeable data that has a non-zero
100 /// initializer and has relocations in it, but all of the
101 /// relocations are known to be within the final linked image
102 /// the global is linked into.
105 /// DataNoRel - This is writeable data that has a non-zero
106 /// initializer, but whose initializer is known to have no
110 /// ReadOnlyWithRel - These are global variables that are never
111 /// written to by the program, but that have relocations, so they
112 /// must be stuck in a writeable section so that the dynamic linker
113 /// can write to them. If it chooses to, the dynamic linker can
114 /// mark the pages these globals end up on as read-only after it is
115 /// done with its relocation phase.
118 /// ReadOnlyWithRelLocal - This is data that is readonly by the
119 /// program, but must be writeable so that the dynamic linker
120 /// can perform relocations in it. This is used when we know
121 /// that all the relocations are to globals in this final
130 /// Weak - This is true if the referenced symbol is weak (i.e. linkonce,
131 /// weak, weak_odr, etc). This is orthogonal from the categorization.
134 /// ExplicitSection - This is true if the global had a section explicitly
136 bool ExplicitSection : 1;
139 bool isWeak() const { return Weak; }
140 bool hasExplicitSection() const { return ExplicitSection; }
142 bool isText() const { return K == Text; }
144 bool isReadOnly() const {
145 return K == ReadOnly || K == MergeableCString || isMergeableConst();
148 bool isMergeableCString() const { return K == MergeableCString; }
149 bool isMergeableConst() const {
150 return K == MergeableConst || K == MergeableConst4 ||
151 K == MergeableConst8 || K == MergeableConst16;
154 bool isMergeableConst4() const { return K == MergeableConst4; }
155 bool isMergeableConst8() const { return K == MergeableConst8; }
156 bool isMergeableConst16() const { return K == MergeableConst16; }
158 bool isWriteable() const {
159 return isThreadLocal() || isGlobalWriteableData();
162 bool isThreadLocal() const {
163 return K == ThreadData || K == ThreadBSS;
166 bool isThreadBSS() const { return K == ThreadBSS; }
167 bool isThreadData() const { return K == ThreadData; }
169 bool isGlobalWriteableData() const {
170 return isBSS() || isDataRel() || isReadOnlyWithRel();
173 bool isBSS() const { return K == BSS; }
175 bool isDataRel() const {
176 return K == DataRel || K == DataRelLocal || K == DataNoRel;
179 bool isDataRelLocal() const {
180 return K == DataRelLocal || K == DataNoRel;
183 bool isDataNoRel() const { return K == DataNoRel; }
185 bool isReadOnlyWithRel() const {
186 return K == ReadOnlyWithRel || K == ReadOnlyWithRelLocal;
189 bool isReadOnlyWithRelLocal() const {
190 return K == ReadOnlyWithRelLocal;
193 static SectionKind get(Kind K, bool isWeak,
194 bool hasExplicitSection = false) {
198 Res.ExplicitSection = hasExplicitSection;
203 namespace SectionFlags {
204 const unsigned Invalid = -1U;
205 const unsigned None = 0;
206 const unsigned Code = 1 << 0; ///< Section contains code
207 const unsigned Writable = 1 << 1; ///< Section is writeable
208 const unsigned BSS = 1 << 2; ///< Section contains only zeroes
209 const unsigned Mergeable = 1 << 3; ///< Section contains mergeable data
210 const unsigned Strings = 1 << 4; ///< Section contains C-type strings
211 const unsigned TLS = 1 << 5; ///< Section contains thread-local data
212 const unsigned Debug = 1 << 6; ///< Section contains debug data
213 const unsigned Linkonce = 1 << 7; ///< Section is linkonce
214 const unsigned TypeFlags = 0xFF;
215 // Some gap for future flags
217 /// Named - True if this section should be printed with ".section <name>",
218 /// false if the section name is something like ".const".
219 const unsigned Named = 1 << 23; ///< Section is named
220 const unsigned EntitySize = 0xFF << 24; ///< Entity size for mergeable stuff
222 static inline unsigned getEntitySize(unsigned Flags) {
223 return (Flags >> 24) & 0xFF;
226 // FIXME: Why does this return a value?
227 static inline unsigned setEntitySize(unsigned Flags, unsigned Size) {
228 return (Flags & ~EntitySize) | ((Size & 0xFF) << 24);
232 static inline unsigned getEmptyKey() { return Invalid; }
233 static inline unsigned getTombstoneKey() { return Invalid - 1; }
234 static unsigned getHashValue(const unsigned &Key) { return Key; }
235 static bool isEqual(unsigned LHS, unsigned RHS) { return LHS == RHS; }
236 static bool isPod() { return true; }
239 typedef DenseMap<unsigned, std::string, KeyInfo> FlagsStringsMapType;
249 friend class TargetAsmInfo;
250 friend class StringMapEntry<Section>;
251 friend class StringMap<Section>;
255 explicit Section(unsigned F = SectionFlags::Invalid) : Flags(F) { }
259 unsigned getEntitySize() const { return (Flags >> 24) & 0xFF; }
261 const std::string &getName() const { return Name; }
262 unsigned getFlags() const { return Flags; }
264 bool hasFlag(unsigned F) const { return (Flags & F) != 0; }
267 /// TargetAsmInfo - This class is intended to be used as a base class for asm
268 /// properties and features specific to the target.
269 class TargetAsmInfo {
271 mutable StringMap<Section> Sections;
272 mutable SectionFlags::FlagsStringsMapType FlagsStrings;
274 /// TM - The current TargetMachine.
275 const TargetMachine &TM;
277 //===------------------------------------------------------------------===//
278 // Properties to be set by the target writer, used to configure asm printer.
281 /// TextSection - Section directive for standard text.
283 const Section *TextSection; // Defaults to ".text".
285 /// DataSection - Section directive for standard data.
287 const Section *DataSection; // Defaults to ".data".
289 /// BSSSection - Section directive for uninitialized data. Null if this
290 /// target doesn't support a BSS section.
292 const char *BSSSection; // Default to ".bss".
293 const Section *BSSSection_;
295 /// ReadOnlySection - This is the directive that is emitted to switch to a
296 /// read-only section for constant data (e.g. data declared const,
298 const Section *ReadOnlySection; // Defaults to NULL
300 /// TLSDataSection - Section directive for Thread Local data.
302 const Section *TLSDataSection; // Defaults to ".tdata".
304 /// TLSBSSSection - Section directive for Thread Local uninitialized data.
305 /// Null if this target doesn't support a BSS section.
307 const Section *TLSBSSSection; // Defaults to ".tbss".
309 /// ZeroFillDirective - Directive for emitting a global to the ZeroFill
310 /// section on this target. Null if this target doesn't support zerofill.
311 const char *ZeroFillDirective; // Default is null.
313 /// NonexecutableStackDirective - Directive for declaring to the
314 /// linker and beyond that the emitted code does not require stack
315 /// memory to be executable.
316 const char *NonexecutableStackDirective; // Default is null.
318 /// NeedsSet - True if target asm treats expressions in data directives
319 /// as linktime-relocatable. For assembly-time computation, we need to
320 /// use a .set. Thus:
323 /// is computed at assembly time, while
325 /// is relocated if the relative locations of x and y change at linktime.
326 /// We want both these things in different places.
327 bool NeedsSet; // Defaults to false.
329 /// MaxInstLength - This is the maximum possible length of an instruction,
330 /// which is needed to compute the size of an inline asm.
331 unsigned MaxInstLength; // Defaults to 4.
333 /// PCSymbol - The symbol used to represent the current PC. Used in PC
334 /// relative expressions.
335 const char *PCSymbol; // Defaults to "$".
337 /// SeparatorChar - This character, if specified, is used to separate
338 /// instructions from each other when on the same line. This is used to
339 /// measure inline asm instructions.
340 char SeparatorChar; // Defaults to ';'
342 /// CommentColumn - This indicates the comment num (zero-based) at
343 /// which asm comments should be printed.
344 unsigned CommentColumn; // Defaults to 60
346 /// CommentString - This indicates the comment character used by the
348 const char *CommentString; // Defaults to "#"
350 /// FirstOperandColumn - The output column where the first operand
351 /// should be printed
352 unsigned FirstOperandColumn; // Defaults to 0 (ignored)
354 /// MaxOperandLength - The maximum length of any printed asm
356 unsigned MaxOperandLength; // Defaults to 0 (ignored)
358 /// GlobalPrefix - If this is set to a non-empty string, it is prepended
359 /// onto all global symbols. This is often used for "_" or ".".
360 const char *GlobalPrefix; // Defaults to ""
362 /// PrivateGlobalPrefix - This prefix is used for globals like constant
363 /// pool entries that are completely private to the .s file and should not
364 /// have names in the .o file. This is often "." or "L".
365 const char *PrivateGlobalPrefix; // Defaults to "."
367 /// LinkerPrivateGlobalPrefix - This prefix is used for symbols that should
368 /// be passed through the assembler but be removed by the linker. This
369 /// is "l" on Darwin, currently used for some ObjC metadata.
370 const char *LinkerPrivateGlobalPrefix; // Defaults to ""
372 /// JumpTableSpecialLabelPrefix - If not null, a extra (dead) label is
373 /// emitted before jump tables with the specified prefix.
374 const char *JumpTableSpecialLabelPrefix; // Default to null.
376 /// GlobalVarAddrPrefix/Suffix - If these are nonempty, these strings
377 /// will enclose any GlobalVariable (that isn't a function)
379 const char *GlobalVarAddrPrefix; // Defaults to ""
380 const char *GlobalVarAddrSuffix; // Defaults to ""
382 /// FunctionAddrPrefix/Suffix - If these are nonempty, these strings
383 /// will enclose any GlobalVariable that points to a function.
385 const char *FunctionAddrPrefix; // Defaults to ""
386 const char *FunctionAddrSuffix; // Defaults to ""
388 /// PersonalityPrefix/Suffix - If these are nonempty, these strings will
389 /// enclose any personality function in the common frame section.
391 const char *PersonalityPrefix; // Defaults to ""
392 const char *PersonalitySuffix; // Defaults to ""
394 /// NeedsIndirectEncoding - If set, we need to set the indirect encoding bit
397 bool NeedsIndirectEncoding; // Defaults to false
399 /// InlineAsmStart/End - If these are nonempty, they contain a directive to
400 /// emit before and after an inline assembly statement.
401 const char *InlineAsmStart; // Defaults to "#APP\n"
402 const char *InlineAsmEnd; // Defaults to "#NO_APP\n"
404 /// AssemblerDialect - Which dialect of an assembler variant to use.
405 unsigned AssemblerDialect; // Defaults to 0
407 /// AllowQuotesInName - This is true if the assembler allows for complex
408 /// symbol names to be surrounded in quotes. This defaults to false.
409 bool AllowQuotesInName;
411 //===--- Data Emission Directives -------------------------------------===//
413 /// ZeroDirective - this should be set to the directive used to get some
414 /// number of zero bytes emitted to the current section. Common cases are
415 /// "\t.zero\t" and "\t.space\t". If this is set to null, the
416 /// Data*bitsDirective's will be used to emit zero bytes.
417 const char *ZeroDirective; // Defaults to "\t.zero\t"
418 const char *ZeroDirectiveSuffix; // Defaults to ""
420 /// AsciiDirective - This directive allows emission of an ascii string with
421 /// the standard C escape characters embedded into it.
422 const char *AsciiDirective; // Defaults to "\t.ascii\t"
424 /// AscizDirective - If not null, this allows for special handling of
425 /// zero terminated strings on this target. This is commonly supported as
426 /// ".asciz". If a target doesn't support this, it can be set to null.
427 const char *AscizDirective; // Defaults to "\t.asciz\t"
429 /// DataDirectives - These directives are used to output some unit of
430 /// integer data to the current section. If a data directive is set to
431 /// null, smaller data directives will be used to emit the large sizes.
432 const char *Data8bitsDirective; // Defaults to "\t.byte\t"
433 const char *Data16bitsDirective; // Defaults to "\t.short\t"
434 const char *Data32bitsDirective; // Defaults to "\t.long\t"
435 const char *Data64bitsDirective; // Defaults to "\t.quad\t"
437 /// getDataASDirective - Return the directive that should be used to emit
438 /// data of the specified size to the specified numeric address space.
439 virtual const char *getDataASDirective(unsigned Size, unsigned AS) const {
440 assert(AS != 0 && "Don't know the directives for default addr space");
444 //===--- Alignment Information ----------------------------------------===//
446 /// AlignDirective - The directive used to emit round up to an alignment
449 const char *AlignDirective; // Defaults to "\t.align\t"
451 /// AlignmentIsInBytes - If this is true (the default) then the asmprinter
452 /// emits ".align N" directives, where N is the number of bytes to align to.
453 /// Otherwise, it emits ".align log2(N)", e.g. 3 to align to an 8 byte
455 bool AlignmentIsInBytes; // Defaults to true
457 /// TextAlignFillValue - If non-zero, this is used to fill the executable
458 /// space created as the result of a alignment directive.
459 unsigned TextAlignFillValue;
461 //===--- Section Switching Directives ---------------------------------===//
463 /// SwitchToSectionDirective - This is the directive used when we want to
464 /// emit a global to an arbitrary section. The section name is emited after
466 const char *SwitchToSectionDirective; // Defaults to "\t.section\t"
468 /// TextSectionStartSuffix - This is printed after each start of section
469 /// directive for text sections.
470 const char *TextSectionStartSuffix; // Defaults to "".
472 /// DataSectionStartSuffix - This is printed after each start of section
473 /// directive for data sections.
474 const char *DataSectionStartSuffix; // Defaults to "".
476 /// SectionEndDirectiveSuffix - If non-null, the asm printer will close each
477 /// section with the section name and this suffix printed.
478 const char *SectionEndDirectiveSuffix;// Defaults to null.
480 /// ConstantPoolSection - This is the section that we SwitchToSection right
481 /// before emitting the constant pool for a function.
482 const char *ConstantPoolSection; // Defaults to "\t.section .rodata"
484 /// JumpTableDataSection - This is the section that we SwitchToSection right
485 /// before emitting the jump tables for a function when the relocation model
487 const char *JumpTableDataSection; // Defaults to "\t.section .rodata"
489 /// JumpTableDirective - if non-null, the directive to emit before a jump
491 const char *JumpTableDirective;
493 /// CStringSection - If not null, this allows for special handling of
494 /// cstring constants (null terminated string that does not contain any
495 /// other null bytes) on this target. This is commonly supported as
497 const char *CStringSection; // Defaults to NULL
498 const Section *CStringSection_;
500 /// StaticCtorsSection - This is the directive that is emitted to switch to
501 /// a section to emit the static constructor list.
502 /// Defaults to "\t.section .ctors,\"aw\",@progbits".
503 const char *StaticCtorsSection;
505 /// StaticDtorsSection - This is the directive that is emitted to switch to
506 /// a section to emit the static destructor list.
507 /// Defaults to "\t.section .dtors,\"aw\",@progbits".
508 const char *StaticDtorsSection;
510 //===--- Global Variable Emission Directives --------------------------===//
512 /// GlobalDirective - This is the directive used to declare a global entity.
514 const char *GlobalDirective; // Defaults to NULL.
516 /// ExternDirective - This is the directive used to declare external
519 const char *ExternDirective; // Defaults to NULL.
521 /// SetDirective - This is the name of a directive that can be used to tell
522 /// the assembler to set the value of a variable to some expression.
523 const char *SetDirective; // Defaults to null.
525 /// LCOMMDirective - This is the name of a directive (if supported) that can
526 /// be used to efficiently declare a local (internal) block of zero
527 /// initialized data in the .bss/.data section. The syntax expected is:
528 /// @verbatim <LCOMMDirective> SYMBOLNAME LENGTHINBYTES, ALIGNMENT
530 const char *LCOMMDirective; // Defaults to null.
532 const char *COMMDirective; // Defaults to "\t.comm\t".
534 /// COMMDirectiveTakesAlignment - True if COMMDirective take a third
535 /// argument that specifies the alignment of the declaration.
536 bool COMMDirectiveTakesAlignment; // Defaults to true.
538 /// HasDotTypeDotSizeDirective - True if the target has .type and .size
539 /// directives, this is true for most ELF targets.
540 bool HasDotTypeDotSizeDirective; // Defaults to true.
542 /// HasSingleParameterDotFile - True if the target has a single parameter
543 /// .file directive, this is true for ELF targets.
544 bool HasSingleParameterDotFile; // Defaults to true.
546 /// UsedDirective - This directive, if non-null, is used to declare a global
547 /// as being used somehow that the assembler can't see. This prevents dead
548 /// code elimination on some targets.
549 const char *UsedDirective; // Defaults to null.
551 /// WeakRefDirective - This directive, if non-null, is used to declare a
552 /// global as being a weak undefined symbol.
553 const char *WeakRefDirective; // Defaults to null.
555 /// WeakDefDirective - This directive, if non-null, is used to declare a
556 /// global as being a weak defined symbol.
557 const char *WeakDefDirective; // Defaults to null.
559 /// HiddenDirective - This directive, if non-null, is used to declare a
560 /// global or function as having hidden visibility.
561 const char *HiddenDirective; // Defaults to "\t.hidden\t".
563 /// ProtectedDirective - This directive, if non-null, is used to declare a
564 /// global or function as having protected visibility.
565 const char *ProtectedDirective; // Defaults to "\t.protected\t".
567 //===--- Dwarf Emission Directives -----------------------------------===//
569 /// AbsoluteDebugSectionOffsets - True if we should emit abolute section
570 /// offsets for debug information. Defaults to false.
571 bool AbsoluteDebugSectionOffsets;
573 /// AbsoluteEHSectionOffsets - True if we should emit abolute section
574 /// offsets for EH information. Defaults to false.
575 bool AbsoluteEHSectionOffsets;
577 /// HasLEB128 - True if target asm supports leb128 directives.
579 bool HasLEB128; // Defaults to false.
581 /// hasDotLocAndDotFile - True if target asm supports .loc and .file
582 /// directives for emitting debugging information.
584 bool HasDotLocAndDotFile; // Defaults to false.
586 /// SupportsDebugInformation - True if target supports emission of debugging
588 bool SupportsDebugInformation;
590 /// SupportsExceptionHandling - True if target supports
591 /// exception handling.
593 bool SupportsExceptionHandling; // Defaults to false.
595 /// RequiresFrameSection - true if the Dwarf2 output needs a frame section
597 bool DwarfRequiresFrameSection; // Defaults to true.
599 /// DwarfUsesInlineInfoSection - True if DwarfDebugInlineSection is used to
600 /// encode inline subroutine information.
601 bool DwarfUsesInlineInfoSection; // Defaults to false.
603 /// Is_EHSymbolPrivate - If set, the "_foo.eh" is made private so that it
604 /// doesn't show up in the symbol table of the object file.
605 bool Is_EHSymbolPrivate; // Defaults to true.
607 /// GlobalEHDirective - This is the directive used to make exception frame
608 /// tables globally visible.
610 const char *GlobalEHDirective; // Defaults to NULL.
612 /// SupportsWeakEmptyEHFrame - True if target assembler and linker will
613 /// handle a weak_definition of constant 0 for an omitted EH frame.
614 bool SupportsWeakOmittedEHFrame; // Defaults to true.
616 /// DwarfSectionOffsetDirective - Special section offset directive.
617 const char* DwarfSectionOffsetDirective; // Defaults to NULL
619 /// DwarfAbbrevSection - Section directive for Dwarf abbrev.
621 const char *DwarfAbbrevSection; // Defaults to ".debug_abbrev".
623 /// DwarfInfoSection - Section directive for Dwarf info.
625 const char *DwarfInfoSection; // Defaults to ".debug_info".
627 /// DwarfLineSection - Section directive for Dwarf info.
629 const char *DwarfLineSection; // Defaults to ".debug_line".
631 /// DwarfFrameSection - Section directive for Dwarf info.
633 const char *DwarfFrameSection; // Defaults to ".debug_frame".
635 /// DwarfPubNamesSection - Section directive for Dwarf info.
637 const char *DwarfPubNamesSection; // Defaults to ".debug_pubnames".
639 /// DwarfPubTypesSection - Section directive for Dwarf info.
641 const char *DwarfPubTypesSection; // Defaults to ".debug_pubtypes".
643 /// DwarfDebugInlineSection - Section directive for inline info.
645 const char *DwarfDebugInlineSection; // Defaults to ".debug_inlined"
647 /// DwarfStrSection - Section directive for Dwarf info.
649 const char *DwarfStrSection; // Defaults to ".debug_str".
651 /// DwarfLocSection - Section directive for Dwarf info.
653 const char *DwarfLocSection; // Defaults to ".debug_loc".
655 /// DwarfARangesSection - Section directive for Dwarf info.
657 const char *DwarfARangesSection; // Defaults to ".debug_aranges".
659 /// DwarfRangesSection - Section directive for Dwarf info.
661 const char *DwarfRangesSection; // Defaults to ".debug_ranges".
663 /// DwarfMacroInfoSection - Section directive for DWARF macro info.
665 const char *DwarfMacroInfoSection; // Defaults to ".debug_macinfo".
667 /// DwarfEHFrameSection - Section directive for Exception frames.
669 const char *DwarfEHFrameSection; // Defaults to ".eh_frame".
671 /// DwarfExceptionSection - Section directive for Exception table.
673 const char *DwarfExceptionSection; // Defaults to ".gcc_except_table".
675 //===--- CBE Asm Translation Table -----------------------------------===//
677 const char *const *AsmTransCBE; // Defaults to empty
680 explicit TargetAsmInfo(const TargetMachine &TM);
681 virtual ~TargetAsmInfo();
683 const Section* getNamedSection(const char *Name,
684 unsigned Flags = SectionFlags::None,
685 bool Override = false) const;
686 const Section* getUnnamedSection(const char *Directive,
687 unsigned Flags = SectionFlags::None,
688 bool Override = false) const;
690 /// Measure the specified inline asm to determine an approximation of its
692 virtual unsigned getInlineAsmLength(const char *Str) const;
694 /// emitUsedDirectiveFor - This hook allows targets to selectively decide
695 /// not to emit the UsedDirective for some symbols in llvm.used.
696 // FIXME: REMOVE this (rdar://7071300)
697 virtual bool emitUsedDirectiveFor(const GlobalValue *GV,
698 Mangler *Mang) const {
702 /// PreferredEHDataFormat - This hook allows the target to select data
703 /// format used for encoding pointers in exception handling data. Reason is
704 /// 0 for data, 1 for code labels, 2 for function pointers. Global is true
705 /// if the symbol can be relocated.
706 virtual unsigned PreferredEHDataFormat(DwarfEncoding::Target Reason,
710 /// getSectionForMergeableConstant - Given a Mergeable constant with the
711 /// specified size and relocation information, return a section that it
712 /// should be placed in.
713 virtual const Section *getSectionForMergeableConstant(SectionKind Kind)const;
716 /// getSectionPrefixForUniqueGlobal - Return a string that we should prepend
717 /// onto a global's name in order to get the unique section name for the
718 /// global. This is important for globals that need to be merged across
719 /// translation units.
721 getSectionPrefixForUniqueGlobal(SectionKind Kind) const {
725 /// getFlagsForNamedSection - If this target wants to be able to infer
726 /// section flags based on the name of the section specified for a global
727 /// variable, it can implement this. This is used on ELF systems so that
728 /// ".tbss" gets the TLS bit set etc.
729 virtual unsigned getFlagsForNamedSection(const char *Section) const {
733 /// SectionForGlobal - This method computes the appropriate section to emit
734 /// the specified global variable or function definition. This should not
735 /// be passed external (or available externally) globals.
736 // FIXME: MOVE TO ASMPRINTER.
737 const Section* SectionForGlobal(const GlobalValue *GV) const;
739 /// getSpecialCasedSectionGlobals - Allow the target to completely override
740 /// section assignment of a global.
741 /// FIXME: ELIMINATE this by making PIC16 implement ADDRESS with
742 /// getFlagsForNamedSection.
743 virtual const Section *
744 getSpecialCasedSectionGlobals(const GlobalValue *GV,
745 SectionKind Kind) const {
749 const std::string &getSectionFlags(unsigned Flags) const;
750 virtual std::string printSectionFlags(unsigned flags) const { return ""; }
752 // FIXME: Eliminate this.
753 virtual const Section* SelectSectionForGlobal(const GlobalValue *GV,
754 SectionKind Kind) const;
756 /// getSLEB128Size - Compute the number of bytes required for a signed
758 static unsigned getSLEB128Size(int Value);
760 /// getULEB128Size - Compute the number of bytes required for an unsigned
762 static unsigned getULEB128Size(unsigned Value);
764 // Data directive accessors.
766 const char *getData8bitsDirective(unsigned AS = 0) const {
767 return AS == 0 ? Data8bitsDirective : getDataASDirective(8, AS);
769 const char *getData16bitsDirective(unsigned AS = 0) const {
770 return AS == 0 ? Data16bitsDirective : getDataASDirective(16, AS);
772 const char *getData32bitsDirective(unsigned AS = 0) const {
773 return AS == 0 ? Data32bitsDirective : getDataASDirective(32, AS);
775 const char *getData64bitsDirective(unsigned AS = 0) const {
776 return AS == 0 ? Data64bitsDirective : getDataASDirective(64, AS);
782 const Section *getTextSection() const {
785 const Section *getDataSection() const {
788 const char *getBSSSection() const {
791 const Section *getBSSSection_() const {
794 const Section *getReadOnlySection() const {
795 return ReadOnlySection;
797 const Section *getTLSDataSection() const {
798 return TLSDataSection;
800 const Section *getTLSBSSSection() const {
801 return TLSBSSSection;
803 const char *getZeroFillDirective() const {
804 return ZeroFillDirective;
806 const char *getNonexecutableStackDirective() const {
807 return NonexecutableStackDirective;
809 bool needsSet() const {
812 const char *getPCSymbol() const {
815 char getSeparatorChar() const {
816 return SeparatorChar;
818 unsigned getCommentColumn() const {
819 return CommentColumn;
821 const char *getCommentString() const {
822 return CommentString;
824 unsigned getOperandColumn(int operand) const {
825 return FirstOperandColumn + (MaxOperandLength+1)*(operand-1);
827 const char *getGlobalPrefix() const {
830 const char *getPrivateGlobalPrefix() const {
831 return PrivateGlobalPrefix;
833 const char *getLinkerPrivateGlobalPrefix() const {
834 return LinkerPrivateGlobalPrefix;
836 const char *getJumpTableSpecialLabelPrefix() const {
837 return JumpTableSpecialLabelPrefix;
839 const char *getGlobalVarAddrPrefix() const {
840 return GlobalVarAddrPrefix;
842 const char *getGlobalVarAddrSuffix() const {
843 return GlobalVarAddrSuffix;
845 const char *getFunctionAddrPrefix() const {
846 return FunctionAddrPrefix;
848 const char *getFunctionAddrSuffix() const {
849 return FunctionAddrSuffix;
851 const char *getPersonalityPrefix() const {
852 return PersonalityPrefix;
854 const char *getPersonalitySuffix() const {
855 return PersonalitySuffix;
857 bool getNeedsIndirectEncoding() const {
858 return NeedsIndirectEncoding;
860 const char *getInlineAsmStart() const {
861 return InlineAsmStart;
863 const char *getInlineAsmEnd() const {
866 unsigned getAssemblerDialect() const {
867 return AssemblerDialect;
869 bool doesAllowQuotesInName() const {
870 return AllowQuotesInName;
872 const char *getZeroDirective() const {
873 return ZeroDirective;
875 const char *getZeroDirectiveSuffix() const {
876 return ZeroDirectiveSuffix;
878 const char *getAsciiDirective() const {
879 return AsciiDirective;
881 const char *getAscizDirective() const {
882 return AscizDirective;
884 const char *getJumpTableDirective() const {
885 return JumpTableDirective;
887 const char *getAlignDirective() const {
888 return AlignDirective;
890 bool getAlignmentIsInBytes() const {
891 return AlignmentIsInBytes;
893 unsigned getTextAlignFillValue() const {
894 return TextAlignFillValue;
896 const char *getSwitchToSectionDirective() const {
897 return SwitchToSectionDirective;
899 const char *getTextSectionStartSuffix() const {
900 return TextSectionStartSuffix;
902 const char *getDataSectionStartSuffix() const {
903 return DataSectionStartSuffix;
905 const char *getSectionEndDirectiveSuffix() const {
906 return SectionEndDirectiveSuffix;
908 const char *getConstantPoolSection() const {
909 return ConstantPoolSection;
911 const char *getJumpTableDataSection() const {
912 return JumpTableDataSection;
914 const char *getCStringSection() const {
915 return CStringSection;
917 const Section *getCStringSection_() const {
918 return CStringSection_;
920 const char *getStaticCtorsSection() const {
921 return StaticCtorsSection;
923 const char *getStaticDtorsSection() const {
924 return StaticDtorsSection;
926 const char *getGlobalDirective() const {
927 return GlobalDirective;
929 const char *getExternDirective() const {
930 return ExternDirective;
932 const char *getSetDirective() const {
935 const char *getLCOMMDirective() const {
936 return LCOMMDirective;
938 const char *getCOMMDirective() const {
939 return COMMDirective;
941 bool getCOMMDirectiveTakesAlignment() const {
942 return COMMDirectiveTakesAlignment;
944 bool hasDotTypeDotSizeDirective() const {
945 return HasDotTypeDotSizeDirective;
947 bool hasSingleParameterDotFile() const {
948 return HasSingleParameterDotFile;
950 const char *getUsedDirective() const {
951 return UsedDirective;
953 const char *getWeakRefDirective() const {
954 return WeakRefDirective;
956 const char *getWeakDefDirective() const {
957 return WeakDefDirective;
959 const char *getHiddenDirective() const {
960 return HiddenDirective;
962 const char *getProtectedDirective() const {
963 return ProtectedDirective;
965 bool isAbsoluteDebugSectionOffsets() const {
966 return AbsoluteDebugSectionOffsets;
968 bool isAbsoluteEHSectionOffsets() const {
969 return AbsoluteEHSectionOffsets;
971 bool hasLEB128() const {
974 bool hasDotLocAndDotFile() const {
975 return HasDotLocAndDotFile;
977 bool doesSupportDebugInformation() const {
978 return SupportsDebugInformation;
980 bool doesSupportExceptionHandling() const {
981 return SupportsExceptionHandling;
983 bool doesDwarfRequireFrameSection() const {
984 return DwarfRequiresFrameSection;
986 bool doesDwarfUsesInlineInfoSection() const {
987 return DwarfUsesInlineInfoSection;
989 bool is_EHSymbolPrivate() const {
990 return Is_EHSymbolPrivate;
992 const char *getGlobalEHDirective() const {
993 return GlobalEHDirective;
995 bool getSupportsWeakOmittedEHFrame() const {
996 return SupportsWeakOmittedEHFrame;
998 const char *getDwarfSectionOffsetDirective() const {
999 return DwarfSectionOffsetDirective;
1001 const char *getDwarfAbbrevSection() const {
1002 return DwarfAbbrevSection;
1004 const char *getDwarfInfoSection() const {
1005 return DwarfInfoSection;
1007 const char *getDwarfLineSection() const {
1008 return DwarfLineSection;
1010 const char *getDwarfFrameSection() const {
1011 return DwarfFrameSection;
1013 const char *getDwarfPubNamesSection() const {
1014 return DwarfPubNamesSection;
1016 const char *getDwarfPubTypesSection() const {
1017 return DwarfPubTypesSection;
1019 const char *getDwarfDebugInlineSection() const {
1020 return DwarfDebugInlineSection;
1022 const char *getDwarfStrSection() const {
1023 return DwarfStrSection;
1025 const char *getDwarfLocSection() const {
1026 return DwarfLocSection;
1028 const char *getDwarfARangesSection() const {
1029 return DwarfARangesSection;
1031 const char *getDwarfRangesSection() const {
1032 return DwarfRangesSection;
1034 const char *getDwarfMacroInfoSection() const {
1035 return DwarfMacroInfoSection;
1037 const char *getDwarfEHFrameSection() const {
1038 return DwarfEHFrameSection;
1040 const char *getDwarfExceptionSection() const {
1041 return DwarfExceptionSection;
1043 const char *const *getAsmCBE() const {