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/Support/DataTypes.h"
24 template <typename T> class SmallVectorImpl;
27 /// TargetAsmInfo - This class is intended to be used as a base class for asm
28 /// properties and features specific to the target.
31 /// TM - The current TargetMachine.
32 const TargetMachine &TM;
34 //===------------------------------------------------------------------===//
35 // Properties to be set by the target writer, used to configure asm printer.
38 /// ZeroFillDirective - Directive for emitting a global to the ZeroFill
39 /// section on this target. Null if this target doesn't support zerofill.
40 const char *ZeroFillDirective; // Default is null.
42 /// NonexecutableStackDirective - Directive for declaring to the
43 /// linker and beyond that the emitted code does not require stack
44 /// memory to be executable.
45 const char *NonexecutableStackDirective; // Default is null.
47 /// NeedsSet - True if target asm treats expressions in data directives
48 /// as linktime-relocatable. For assembly-time computation, we need to
52 /// is computed at assembly time, while
54 /// is relocated if the relative locations of x and y change at linktime.
55 /// We want both these things in different places.
56 bool NeedsSet; // Defaults to false.
58 /// MaxInstLength - This is the maximum possible length of an instruction,
59 /// which is needed to compute the size of an inline asm.
60 unsigned MaxInstLength; // Defaults to 4.
62 /// PCSymbol - The symbol used to represent the current PC. Used in PC
63 /// relative expressions.
64 const char *PCSymbol; // Defaults to "$".
66 /// SeparatorChar - This character, if specified, is used to separate
67 /// instructions from each other when on the same line. This is used to
68 /// measure inline asm instructions.
69 char SeparatorChar; // Defaults to ';'
71 /// CommentColumn - This indicates the comment num (zero-based) at
72 /// which asm comments should be printed.
73 unsigned CommentColumn; // Defaults to 60
75 /// CommentString - This indicates the comment character used by the
77 const char *CommentString; // Defaults to "#"
79 /// FirstOperandColumn - The output column where the first operand
81 unsigned FirstOperandColumn; // Defaults to 0 (ignored)
83 /// MaxOperandLength - The maximum length of any printed asm
85 unsigned MaxOperandLength; // Defaults to 0 (ignored)
87 /// GlobalPrefix - If this is set to a non-empty string, it is prepended
88 /// onto all global symbols. This is often used for "_" or ".".
89 const char *GlobalPrefix; // Defaults to ""
91 /// PrivateGlobalPrefix - This prefix is used for globals like constant
92 /// pool entries that are completely private to the .s file and should not
93 /// have names in the .o file. This is often "." or "L".
94 const char *PrivateGlobalPrefix; // Defaults to "."
96 /// LinkerPrivateGlobalPrefix - This prefix is used for symbols that should
97 /// be passed through the assembler but be removed by the linker. This
98 /// is "l" on Darwin, currently used for some ObjC metadata.
99 const char *LinkerPrivateGlobalPrefix; // Defaults to ""
101 /// JumpTableSpecialLabelPrefix - If not null, a extra (dead) label is
102 /// emitted before jump tables with the specified prefix.
103 const char *JumpTableSpecialLabelPrefix; // Default to null.
105 /// GlobalVarAddrPrefix/Suffix - If these are nonempty, these strings
106 /// will enclose any GlobalVariable (that isn't a function)
108 const char *GlobalVarAddrPrefix; // Defaults to ""
109 const char *GlobalVarAddrSuffix; // Defaults to ""
111 /// FunctionAddrPrefix/Suffix - If these are nonempty, these strings
112 /// will enclose any GlobalVariable that points to a function.
114 const char *FunctionAddrPrefix; // Defaults to ""
115 const char *FunctionAddrSuffix; // Defaults to ""
117 /// PersonalityPrefix/Suffix - If these are nonempty, these strings will
118 /// enclose any personality function in the common frame section.
120 const char *PersonalityPrefix; // Defaults to ""
121 const char *PersonalitySuffix; // Defaults to ""
123 /// NeedsIndirectEncoding - If set, we need to set the indirect encoding bit
126 bool NeedsIndirectEncoding; // Defaults to false
128 /// InlineAsmStart/End - If these are nonempty, they contain a directive to
129 /// emit before and after an inline assembly statement.
130 const char *InlineAsmStart; // Defaults to "#APP\n"
131 const char *InlineAsmEnd; // Defaults to "#NO_APP\n"
133 /// AssemblerDialect - Which dialect of an assembler variant to use.
134 unsigned AssemblerDialect; // Defaults to 0
136 /// AllowQuotesInName - This is true if the assembler allows for complex
137 /// symbol names to be surrounded in quotes. This defaults to false.
138 bool AllowQuotesInName;
140 //===--- Data Emission Directives -------------------------------------===//
142 /// ZeroDirective - this should be set to the directive used to get some
143 /// number of zero bytes emitted to the current section. Common cases are
144 /// "\t.zero\t" and "\t.space\t". If this is set to null, the
145 /// Data*bitsDirective's will be used to emit zero bytes.
146 const char *ZeroDirective; // Defaults to "\t.zero\t"
147 const char *ZeroDirectiveSuffix; // Defaults to ""
149 /// AsciiDirective - This directive allows emission of an ascii string with
150 /// the standard C escape characters embedded into it.
151 const char *AsciiDirective; // Defaults to "\t.ascii\t"
153 /// AscizDirective - If not null, this allows for special handling of
154 /// zero terminated strings on this target. This is commonly supported as
155 /// ".asciz". If a target doesn't support this, it can be set to null.
156 const char *AscizDirective; // Defaults to "\t.asciz\t"
158 /// DataDirectives - These directives are used to output some unit of
159 /// integer data to the current section. If a data directive is set to
160 /// null, smaller data directives will be used to emit the large sizes.
161 const char *Data8bitsDirective; // Defaults to "\t.byte\t"
162 const char *Data16bitsDirective; // Defaults to "\t.short\t"
163 const char *Data32bitsDirective; // Defaults to "\t.long\t"
164 const char *Data64bitsDirective; // Defaults to "\t.quad\t"
166 /// getDataASDirective - Return the directive that should be used to emit
167 /// data of the specified size to the specified numeric address space.
168 virtual const char *getDataASDirective(unsigned Size, unsigned AS) const {
169 assert(AS != 0 && "Don't know the directives for default addr space");
173 //===--- Alignment Information ----------------------------------------===//
175 /// AlignDirective - The directive used to emit round up to an alignment
178 const char *AlignDirective; // Defaults to "\t.align\t"
180 /// AlignmentIsInBytes - If this is true (the default) then the asmprinter
181 /// emits ".align N" directives, where N is the number of bytes to align to.
182 /// Otherwise, it emits ".align log2(N)", e.g. 3 to align to an 8 byte
184 bool AlignmentIsInBytes; // Defaults to true
186 /// TextAlignFillValue - If non-zero, this is used to fill the executable
187 /// space created as the result of a alignment directive.
188 unsigned TextAlignFillValue;
190 //===--- Section Switching Directives ---------------------------------===//
192 /// SwitchToSectionDirective - This is the directive used when we want to
193 /// emit a global to an arbitrary section. The section name is emited after
195 const char *SwitchToSectionDirective; // Defaults to "\t.section\t"
197 /// TextSectionStartSuffix - This is printed after each start of section
198 /// directive for text sections.
199 const char *TextSectionStartSuffix; // Defaults to "".
201 /// DataSectionStartSuffix - This is printed after each start of section
202 /// directive for data sections.
203 const char *DataSectionStartSuffix; // Defaults to "".
205 /// SectionEndDirectiveSuffix - If non-null, the asm printer will close each
206 /// section with the section name and this suffix printed.
207 const char *SectionEndDirectiveSuffix;// Defaults to null.
209 /// JumpTableDataSection - This is the section that we SwitchToSection right
210 /// before emitting the jump tables for a function when the relocation model
212 const char *JumpTableDataSection; // Defaults to "\t.section .rodata"
214 /// JumpTableDirective - if non-null, the directive to emit before a jump
216 const char *JumpTableDirective;
218 /// StaticCtorsSection - This is the directive that is emitted to switch to
219 /// a section to emit the static constructor list.
220 /// Defaults to "\t.section .ctors,\"aw\",@progbits".
221 const char *StaticCtorsSection;
223 /// StaticDtorsSection - This is the directive that is emitted to switch to
224 /// a section to emit the static destructor list.
225 /// Defaults to "\t.section .dtors,\"aw\",@progbits".
226 const char *StaticDtorsSection;
228 //===--- Global Variable Emission Directives --------------------------===//
230 /// GlobalDirective - This is the directive used to declare a global entity.
232 const char *GlobalDirective; // Defaults to NULL.
234 /// ExternDirective - This is the directive used to declare external
237 const char *ExternDirective; // Defaults to NULL.
239 /// SetDirective - This is the name of a directive that can be used to tell
240 /// the assembler to set the value of a variable to some expression.
241 const char *SetDirective; // Defaults to null.
243 /// LCOMMDirective - This is the name of a directive (if supported) that can
244 /// be used to efficiently declare a local (internal) block of zero
245 /// initialized data in the .bss/.data section. The syntax expected is:
246 /// @verbatim <LCOMMDirective> SYMBOLNAME LENGTHINBYTES, ALIGNMENT
248 const char *LCOMMDirective; // Defaults to null.
250 const char *COMMDirective; // Defaults to "\t.comm\t".
252 /// COMMDirectiveTakesAlignment - True if COMMDirective take a third
253 /// argument that specifies the alignment of the declaration.
254 bool COMMDirectiveTakesAlignment; // Defaults to true.
256 /// HasDotTypeDotSizeDirective - True if the target has .type and .size
257 /// directives, this is true for most ELF targets.
258 bool HasDotTypeDotSizeDirective; // Defaults to true.
260 /// HasSingleParameterDotFile - True if the target has a single parameter
261 /// .file directive, this is true for ELF targets.
262 bool HasSingleParameterDotFile; // Defaults to true.
264 /// UsedDirective - This directive, if non-null, is used to declare a global
265 /// as being used somehow that the assembler can't see. This prevents dead
266 /// code elimination on some targets.
267 const char *UsedDirective; // Defaults to null.
269 /// WeakRefDirective - This directive, if non-null, is used to declare a
270 /// global as being a weak undefined symbol.
271 const char *WeakRefDirective; // Defaults to null.
273 /// WeakDefDirective - This directive, if non-null, is used to declare a
274 /// global as being a weak defined symbol.
275 const char *WeakDefDirective; // Defaults to null.
277 /// HiddenDirective - This directive, if non-null, is used to declare a
278 /// global or function as having hidden visibility.
279 const char *HiddenDirective; // Defaults to "\t.hidden\t".
281 /// ProtectedDirective - This directive, if non-null, is used to declare a
282 /// global or function as having protected visibility.
283 const char *ProtectedDirective; // Defaults to "\t.protected\t".
285 //===--- Dwarf Emission Directives -----------------------------------===//
287 /// AbsoluteDebugSectionOffsets - True if we should emit abolute section
288 /// offsets for debug information. Defaults to false.
289 bool AbsoluteDebugSectionOffsets;
291 /// AbsoluteEHSectionOffsets - True if we should emit abolute section
292 /// offsets for EH information. Defaults to false.
293 bool AbsoluteEHSectionOffsets;
295 /// HasLEB128 - True if target asm supports leb128 directives.
297 bool HasLEB128; // Defaults to false.
299 /// hasDotLocAndDotFile - True if target asm supports .loc and .file
300 /// directives for emitting debugging information.
302 bool HasDotLocAndDotFile; // Defaults to false.
304 /// SupportsDebugInformation - True if target supports emission of debugging
306 bool SupportsDebugInformation;
308 /// SupportsExceptionHandling - True if target supports
309 /// exception handling.
311 bool SupportsExceptionHandling; // Defaults to false.
313 /// RequiresFrameSection - true if the Dwarf2 output needs a frame section
315 bool DwarfRequiresFrameSection; // Defaults to true.
317 /// DwarfUsesInlineInfoSection - True if DwarfDebugInlineSection is used to
318 /// encode inline subroutine information.
319 bool DwarfUsesInlineInfoSection; // Defaults to false.
321 /// Is_EHSymbolPrivate - If set, the "_foo.eh" is made private so that it
322 /// doesn't show up in the symbol table of the object file.
323 bool Is_EHSymbolPrivate; // Defaults to true.
325 /// GlobalEHDirective - This is the directive used to make exception frame
326 /// tables globally visible.
328 const char *GlobalEHDirective; // Defaults to NULL.
330 /// SupportsWeakEmptyEHFrame - True if target assembler and linker will
331 /// handle a weak_definition of constant 0 for an omitted EH frame.
332 bool SupportsWeakOmittedEHFrame; // Defaults to true.
334 /// DwarfSectionOffsetDirective - Special section offset directive.
335 const char* DwarfSectionOffsetDirective; // Defaults to NULL
337 /// DwarfAbbrevSection - Section directive for Dwarf abbrev.
339 const char *DwarfAbbrevSection; // Defaults to ".debug_abbrev".
341 /// DwarfInfoSection - Section directive for Dwarf info.
343 const char *DwarfInfoSection; // Defaults to ".debug_info".
345 /// DwarfLineSection - Section directive for Dwarf info.
347 const char *DwarfLineSection; // Defaults to ".debug_line".
349 /// DwarfFrameSection - Section directive for Dwarf info.
351 const char *DwarfFrameSection; // Defaults to ".debug_frame".
353 /// DwarfPubNamesSection - Section directive for Dwarf info.
355 const char *DwarfPubNamesSection; // Defaults to ".debug_pubnames".
357 /// DwarfPubTypesSection - Section directive for Dwarf info.
359 const char *DwarfPubTypesSection; // Defaults to ".debug_pubtypes".
361 /// DwarfDebugInlineSection - Section directive for inline info.
363 const char *DwarfDebugInlineSection; // Defaults to ".debug_inlined"
365 /// DwarfStrSection - Section directive for Dwarf info.
367 const char *DwarfStrSection; // Defaults to ".debug_str".
369 /// DwarfLocSection - Section directive for Dwarf info.
371 const char *DwarfLocSection; // Defaults to ".debug_loc".
373 /// DwarfARangesSection - Section directive for Dwarf info.
375 const char *DwarfARangesSection; // Defaults to ".debug_aranges".
377 /// DwarfRangesSection - Section directive for Dwarf info.
379 const char *DwarfRangesSection; // Defaults to ".debug_ranges".
381 /// DwarfMacroInfoSection - Section directive for DWARF macro info.
383 const char *DwarfMacroInfoSection; // Defaults to ".debug_macinfo".
385 /// DwarfEHFrameSection - Section directive for Exception frames.
387 const char *DwarfEHFrameSection; // Defaults to ".eh_frame".
389 /// DwarfExceptionSection - Section directive for Exception table.
391 const char *DwarfExceptionSection; // Defaults to ".gcc_except_table".
393 //===--- CBE Asm Translation Table -----------------------------------===//
395 const char *const *AsmTransCBE; // Defaults to empty
398 explicit TargetAsmInfo(const TargetMachine &TM);
399 virtual ~TargetAsmInfo();
401 /// Measure the specified inline asm to determine an approximation of its
403 virtual unsigned getInlineAsmLength(const char *Str) const;
405 /// PreferredEHDataFormat - This hook allows the target to select data
406 /// format used for encoding pointers in exception handling data.
407 virtual unsigned PreferredEHDataFormat() const;
410 /// getSLEB128Size - Compute the number of bytes required for a signed
412 static unsigned getSLEB128Size(int Value);
414 /// getULEB128Size - Compute the number of bytes required for an unsigned
416 static unsigned getULEB128Size(unsigned Value);
418 // Data directive accessors.
420 const char *getData8bitsDirective(unsigned AS = 0) const {
421 return AS == 0 ? Data8bitsDirective : getDataASDirective(8, AS);
423 const char *getData16bitsDirective(unsigned AS = 0) const {
424 return AS == 0 ? Data16bitsDirective : getDataASDirective(16, AS);
426 const char *getData32bitsDirective(unsigned AS = 0) const {
427 return AS == 0 ? Data32bitsDirective : getDataASDirective(32, AS);
429 const char *getData64bitsDirective(unsigned AS = 0) const {
430 return AS == 0 ? Data64bitsDirective : getDataASDirective(64, AS);
436 const char *getZeroFillDirective() const {
437 return ZeroFillDirective;
439 const char *getNonexecutableStackDirective() const {
440 return NonexecutableStackDirective;
442 bool needsSet() const {
445 const char *getPCSymbol() const {
448 char getSeparatorChar() const {
449 return SeparatorChar;
451 unsigned getCommentColumn() const {
452 return CommentColumn;
454 const char *getCommentString() const {
455 return CommentString;
457 unsigned getOperandColumn(int operand) const {
458 return FirstOperandColumn + (MaxOperandLength+1)*(operand-1);
460 const char *getGlobalPrefix() const {
463 const char *getPrivateGlobalPrefix() const {
464 return PrivateGlobalPrefix;
466 const char *getLinkerPrivateGlobalPrefix() const {
467 return LinkerPrivateGlobalPrefix;
469 const char *getJumpTableSpecialLabelPrefix() const {
470 return JumpTableSpecialLabelPrefix;
472 const char *getGlobalVarAddrPrefix() const {
473 return GlobalVarAddrPrefix;
475 const char *getGlobalVarAddrSuffix() const {
476 return GlobalVarAddrSuffix;
478 const char *getFunctionAddrPrefix() const {
479 return FunctionAddrPrefix;
481 const char *getFunctionAddrSuffix() const {
482 return FunctionAddrSuffix;
484 const char *getPersonalityPrefix() const {
485 return PersonalityPrefix;
487 const char *getPersonalitySuffix() const {
488 return PersonalitySuffix;
490 bool getNeedsIndirectEncoding() const {
491 return NeedsIndirectEncoding;
493 const char *getInlineAsmStart() const {
494 return InlineAsmStart;
496 const char *getInlineAsmEnd() const {
499 unsigned getAssemblerDialect() const {
500 return AssemblerDialect;
502 bool doesAllowQuotesInName() const {
503 return AllowQuotesInName;
505 const char *getZeroDirective() const {
506 return ZeroDirective;
508 const char *getZeroDirectiveSuffix() const {
509 return ZeroDirectiveSuffix;
511 const char *getAsciiDirective() const {
512 return AsciiDirective;
514 const char *getAscizDirective() const {
515 return AscizDirective;
517 const char *getJumpTableDirective() const {
518 return JumpTableDirective;
520 const char *getAlignDirective() const {
521 return AlignDirective;
523 bool getAlignmentIsInBytes() const {
524 return AlignmentIsInBytes;
526 unsigned getTextAlignFillValue() const {
527 return TextAlignFillValue;
529 const char *getSwitchToSectionDirective() const {
530 return SwitchToSectionDirective;
532 const char *getTextSectionStartSuffix() const {
533 return TextSectionStartSuffix;
535 const char *getDataSectionStartSuffix() const {
536 return DataSectionStartSuffix;
538 const char *getSectionEndDirectiveSuffix() const {
539 return SectionEndDirectiveSuffix;
541 const char *getJumpTableDataSection() const {
542 return JumpTableDataSection;
544 const char *getStaticCtorsSection() const {
545 return StaticCtorsSection;
547 const char *getStaticDtorsSection() const {
548 return StaticDtorsSection;
550 const char *getGlobalDirective() const {
551 return GlobalDirective;
553 const char *getExternDirective() const {
554 return ExternDirective;
556 const char *getSetDirective() const {
559 const char *getLCOMMDirective() const {
560 return LCOMMDirective;
562 const char *getCOMMDirective() const {
563 return COMMDirective;
565 bool getCOMMDirectiveTakesAlignment() const {
566 return COMMDirectiveTakesAlignment;
568 bool hasDotTypeDotSizeDirective() const {
569 return HasDotTypeDotSizeDirective;
571 bool hasSingleParameterDotFile() const {
572 return HasSingleParameterDotFile;
574 const char *getUsedDirective() const {
575 return UsedDirective;
577 const char *getWeakRefDirective() const {
578 return WeakRefDirective;
580 const char *getWeakDefDirective() const {
581 return WeakDefDirective;
583 const char *getHiddenDirective() const {
584 return HiddenDirective;
586 const char *getProtectedDirective() const {
587 return ProtectedDirective;
589 bool isAbsoluteDebugSectionOffsets() const {
590 return AbsoluteDebugSectionOffsets;
592 bool isAbsoluteEHSectionOffsets() const {
593 return AbsoluteEHSectionOffsets;
595 bool hasLEB128() const {
598 bool hasDotLocAndDotFile() const {
599 return HasDotLocAndDotFile;
601 bool doesSupportDebugInformation() const {
602 return SupportsDebugInformation;
604 bool doesSupportExceptionHandling() const {
605 return SupportsExceptionHandling;
607 bool doesDwarfRequireFrameSection() const {
608 return DwarfRequiresFrameSection;
610 bool doesDwarfUsesInlineInfoSection() const {
611 return DwarfUsesInlineInfoSection;
613 bool is_EHSymbolPrivate() const {
614 return Is_EHSymbolPrivate;
616 const char *getGlobalEHDirective() const {
617 return GlobalEHDirective;
619 bool getSupportsWeakOmittedEHFrame() const {
620 return SupportsWeakOmittedEHFrame;
622 const char *getDwarfSectionOffsetDirective() const {
623 return DwarfSectionOffsetDirective;
625 const char *getDwarfAbbrevSection() const {
626 return DwarfAbbrevSection;
628 const char *getDwarfInfoSection() const {
629 return DwarfInfoSection;
631 const char *getDwarfLineSection() const {
632 return DwarfLineSection;
634 const char *getDwarfFrameSection() const {
635 return DwarfFrameSection;
637 const char *getDwarfPubNamesSection() const {
638 return DwarfPubNamesSection;
640 const char *getDwarfPubTypesSection() const {
641 return DwarfPubTypesSection;
643 const char *getDwarfDebugInlineSection() const {
644 return DwarfDebugInlineSection;
646 const char *getDwarfStrSection() const {
647 return DwarfStrSection;
649 const char *getDwarfLocSection() const {
650 return DwarfLocSection;
652 const char *getDwarfARangesSection() const {
653 return DwarfARangesSection;
655 const char *getDwarfRangesSection() const {
656 return DwarfRangesSection;
658 const char *getDwarfMacroInfoSection() const {
659 return DwarfMacroInfoSection;
661 const char *getDwarfEHFrameSection() const {
662 return DwarfEHFrameSection;
664 const char *getDwarfExceptionSection() const {
665 return DwarfExceptionSection;
667 const char *const *getAsmCBE() const {