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llvm-6502/include/llvm/Target/TargetAsmInfo.h

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//===-- llvm/Target/TargetAsmInfo.h - Asm info ------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains a class to be used as the basis for target specific
// asm writers. This class primarily takes care of global printing constants,
// which are used in very similar ways across all targets.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TARGET_ASM_INFO_H
#define LLVM_TARGET_ASM_INFO_H
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/Support/DataTypes.h"
namespace llvm {
// DWARF encoding query type
namespace DwarfEncoding {
enum Target {
Data = 0,
CodeLabels = 1,
Functions = 2
};
}
namespace SectionKind {
enum Kind {
Text, ///< Text section
Data, ///< Data section
BSS, ///< BSS section
ROData, ///< Readonly data section
RODataMergeStr, ///< Readonly data section (mergeable strings)
RODataMergeConst, ///< Readonly data section (mergeable constants)
ThreadData, ///< Initialized TLS data objects
ThreadBSS ///< Uninitialized TLS data objects
};
}
class TargetMachine;
class CallInst;
class GlobalValue;
/// TargetAsmInfo - This class is intended to be used as a base class for asm
/// properties and features specific to the target.
class TargetAsmInfo {
protected:
//===------------------------------------------------------------------===//
// Properties to be set by the target writer, used to configure asm printer.
//
/// TextSection - Section directive for standard text.
///
const char *TextSection; // Defaults to ".text".
/// DataSection - Section directive for standard data.
///
const char *DataSection; // Defaults to ".data".
/// BSSSection - Section directive for uninitialized data. Null if this
/// target doesn't support a BSS section.
///
const char *BSSSection; // Default to ".bss".
/// TLSDataSection - Section directive for Thread Local data.
///
const char *TLSDataSection;// Defaults to ".section .tdata,"awT",@progbits".
/// TLSBSSSection - Section directive for Thread Local uninitialized data.
/// Null if this target doesn't support a BSS section.
///
const char *TLSBSSSection;// Default to ".section .tbss,"awT",@nobits".
/// ZeroFillDirective - Directive for emitting a global to the ZeroFill
/// section on this target. Null if this target doesn't support zerofill.
const char *ZeroFillDirective; // Default is null.
/// NonexecutableStackDirective - Directive for declaring to the
/// linker and beyond that the emitted code does not require stack
/// memory to be executable.
const char *NonexecutableStackDirective; // Default is null.
/// NeedsSet - True if target asm treats expressions in data directives
/// as linktime-relocatable. For assembly-time computation, we need to
/// use a .set. Thus:
/// .set w, x-y
/// .long w
/// is computed at assembly time, while
/// .long x-y
/// is relocated if the relative locations of x and y change at linktime.
/// We want both these things in different places.
bool NeedsSet; // Defaults to false.
/// MaxInstLength - This is the maximum possible length of an instruction,
/// which is needed to compute the size of an inline asm.
unsigned MaxInstLength; // Defaults to 4.
/// PCSymbol - The symbol used to represent the current PC. Used in PC
/// relative expressions.
const char *PCSymbol; // Defaults to "$".
/// SeparatorChar - This character, if specified, is used to separate
/// instructions from each other when on the same line. This is used to
/// measure inline asm instructions.
char SeparatorChar; // Defaults to ';'
/// CommentString - This indicates the comment character used by the
/// assembler.
const char *CommentString; // Defaults to "#"
/// GlobalPrefix - If this is set to a non-empty string, it is prepended
/// onto all global symbols. This is often used for "_" or ".".
const char *GlobalPrefix; // Defaults to ""
/// PrivateGlobalPrefix - This prefix is used for globals like constant
/// pool entries that are completely private to the .o file and should not
/// have names in the .o file. This is often "." or "L".
const char *PrivateGlobalPrefix; // Defaults to "."
/// JumpTableSpecialLabelPrefix - If not null, a extra (dead) label is
/// emitted before jump tables with the specified prefix.
const char *JumpTableSpecialLabelPrefix; // Default to null.
/// GlobalVarAddrPrefix/Suffix - If these are nonempty, these strings
/// will enclose any GlobalVariable (that isn't a function)
///
const char *GlobalVarAddrPrefix; // Defaults to ""
const char *GlobalVarAddrSuffix; // Defaults to ""
/// FunctionAddrPrefix/Suffix - If these are nonempty, these strings
/// will enclose any GlobalVariable that points to a function.
/// For example, this is used by the IA64 backend to materialize
/// function descriptors, by decorating the ".data8" object with the
/// @verbatim @fptr( ) @endverbatim
/// link-relocation operator.
///
const char *FunctionAddrPrefix; // Defaults to ""
const char *FunctionAddrSuffix; // Defaults to ""
/// PersonalityPrefix/Suffix - If these are nonempty, these strings will
/// enclose any personality function in the common frame section.
///
const char *PersonalityPrefix; // Defaults to ""
const char *PersonalitySuffix; // Defaults to ""
/// NeedsIndirectEncoding - If set, we need to set the indirect encoding bit
/// for EH in Dwarf.
///
bool NeedsIndirectEncoding; // Defaults to false
/// InlineAsmStart/End - If these are nonempty, they contain a directive to
/// emit before and after an inline assembly statement.
const char *InlineAsmStart; // Defaults to "#APP\n"
const char *InlineAsmEnd; // Defaults to "#NO_APP\n"
/// AssemblerDialect - Which dialect of an assembler variant to use.
unsigned AssemblerDialect; // Defaults to 0
/// StringConstantPrefix - Prefix for FEs to use when generating unnamed
/// constant strings. These names get run through the Mangler later; if
/// you want the Mangler not to add the GlobalPrefix as well,
/// use '\1' as the first character.
const char *StringConstantPrefix; // Defaults to ".str"
//===--- Data Emission Directives -------------------------------------===//
/// ZeroDirective - this should be set to the directive used to get some
/// number of zero bytes emitted to the current section. Common cases are
/// "\t.zero\t" and "\t.space\t". If this is set to null, the
/// Data*bitsDirective's will be used to emit zero bytes.
const char *ZeroDirective; // Defaults to "\t.zero\t"
const char *ZeroDirectiveSuffix; // Defaults to ""
/// AsciiDirective - This directive allows emission of an ascii string with
/// the standard C escape characters embedded into it.
const char *AsciiDirective; // Defaults to "\t.ascii\t"
/// AscizDirective - If not null, this allows for special handling of
/// zero terminated strings on this target. This is commonly supported as
/// ".asciz". If a target doesn't support this, it can be set to null.
const char *AscizDirective; // Defaults to "\t.asciz\t"
/// DataDirectives - These directives are used to output some unit of
/// integer data to the current section. If a data directive is set to
/// null, smaller data directives will be used to emit the large sizes.
const char *Data8bitsDirective; // Defaults to "\t.byte\t"
const char *Data16bitsDirective; // Defaults to "\t.short\t"
const char *Data32bitsDirective; // Defaults to "\t.long\t"
const char *Data64bitsDirective; // Defaults to "\t.quad\t"
//===--- Alignment Information ----------------------------------------===//
/// AlignDirective - The directive used to emit round up to an alignment
/// boundary.
///
const char *AlignDirective; // Defaults to "\t.align\t"
/// AlignmentIsInBytes - If this is true (the default) then the asmprinter
/// emits ".align N" directives, where N is the number of bytes to align to.
/// Otherwise, it emits ".align log2(N)", e.g. 3 to align to an 8 byte
/// boundary.
bool AlignmentIsInBytes; // Defaults to true
/// TextAlignFillValue - If non-zero, this is used to fill the executable
/// space created as the result of a alignment directive.
unsigned TextAlignFillValue;
//===--- Section Switching Directives ---------------------------------===//
/// SwitchToSectionDirective - This is the directive used when we want to
/// emit a global to an arbitrary section. The section name is emited after
/// this.
const char *SwitchToSectionDirective; // Defaults to "\t.section\t"
/// TextSectionStartSuffix - This is printed after each start of section
/// directive for text sections.
const char *TextSectionStartSuffix; // Defaults to "".
/// DataSectionStartSuffix - This is printed after each start of section
/// directive for data sections.
const char *DataSectionStartSuffix; // Defaults to "".
/// SectionEndDirectiveSuffix - If non-null, the asm printer will close each
/// section with the section name and this suffix printed.
const char *SectionEndDirectiveSuffix;// Defaults to null.
/// ConstantPoolSection - This is the section that we SwitchToSection right
/// before emitting the constant pool for a function.
const char *ConstantPoolSection; // Defaults to "\t.section .rodata"
/// JumpTableDataSection - This is the section that we SwitchToSection right
/// before emitting the jump tables for a function when the relocation model
/// is not PIC.
const char *JumpTableDataSection; // Defaults to "\t.section .rodata"
/// JumpTableDirective - if non-null, the directive to emit before a jump
/// table.
const char *JumpTableDirective;
/// CStringSection - If not null, this allows for special handling of
/// cstring constants (null terminated string that does not contain any
/// other null bytes) on this target. This is commonly supported as
/// ".cstring".
const char *CStringSection; // Defaults to NULL
/// StaticCtorsSection - This is the directive that is emitted to switch to
/// a section to emit the static constructor list.
/// Defaults to "\t.section .ctors,\"aw\",@progbits".
const char *StaticCtorsSection;
/// StaticDtorsSection - This is the directive that is emitted to switch to
/// a section to emit the static destructor list.
/// Defaults to "\t.section .dtors,\"aw\",@progbits".
const char *StaticDtorsSection;
/// FourByteConstantSection, EightByteConstantSection,
/// SixteenByteConstantSection - These are special sections where we place
/// 4-, 8-, and 16- byte constant literals.
const char *FourByteConstantSection;
const char *EightByteConstantSection;
const char *SixteenByteConstantSection;
/// ReadOnlySection - This is the directive that is emitted to switch to a
/// read-only section for constant data (e.g. data declared const,
/// jump tables).
const char *ReadOnlySection; // Defaults to NULL
//===--- Global Variable Emission Directives --------------------------===//
/// GlobalDirective - This is the directive used to declare a global entity.
///
const char *GlobalDirective; // Defaults to NULL.
/// SetDirective - This is the name of a directive that can be used to tell
/// the assembler to set the value of a variable to some expression.
const char *SetDirective; // Defaults to null.
/// LCOMMDirective - This is the name of a directive (if supported) that can
/// be used to efficiently declare a local (internal) block of zero
/// initialized data in the .bss/.data section. The syntax expected is:
/// @verbatim <LCOMMDirective> SYMBOLNAME LENGTHINBYTES, ALIGNMENT
/// @endverbatim
const char *LCOMMDirective; // Defaults to null.
const char *COMMDirective; // Defaults to "\t.comm\t".
/// COMMDirectiveTakesAlignment - True if COMMDirective take a third
/// argument that specifies the alignment of the declaration.
bool COMMDirectiveTakesAlignment; // Defaults to true.
/// HasDotTypeDotSizeDirective - True if the target has .type and .size
/// directives, this is true for most ELF targets.
bool HasDotTypeDotSizeDirective; // Defaults to true.
/// UsedDirective - This directive, if non-null, is used to declare a global
/// as being used somehow that the assembler can't see. This prevents dead
/// code elimination on some targets.
const char *UsedDirective; // Defaults to null.
/// WeakRefDirective - This directive, if non-null, is used to declare a
/// global as being a weak undefined symbol.
const char *WeakRefDirective; // Defaults to null.
/// WeakDefDirective - This directive, if non-null, is used to declare a
/// global as being a weak defined symbol.
const char *WeakDefDirective; // Defaults to null.
/// HiddenDirective - This directive, if non-null, is used to declare a
/// global or function as having hidden visibility.
const char *HiddenDirective; // Defaults to "\t.hidden\t".
/// ProtectedDirective - This directive, if non-null, is used to declare a
/// global or function as having protected visibility.
const char *ProtectedDirective; // Defaults to "\t.protected\t".
//===--- Dwarf Emission Directives -----------------------------------===//
/// AbsoluteDebugSectionOffsets - True if we should emit abolute section
/// offsets for debug information. Defaults to false.
bool AbsoluteDebugSectionOffsets;
/// AbsoluteEHSectionOffsets - True if we should emit abolute section
/// offsets for EH information. Defaults to false.
bool AbsoluteEHSectionOffsets;
/// HasLEB128 - True if target asm supports leb128 directives.
///
bool HasLEB128; // Defaults to false.
/// hasDotLocAndDotFile - True if target asm supports .loc and .file
/// directives for emitting debugging information.
///
bool HasDotLocAndDotFile; // Defaults to false.
/// SupportsDebugInformation - True if target supports emission of debugging
/// information.
bool SupportsDebugInformation;
/// SupportsExceptionHandling - True if target supports
/// exception handling.
///
bool SupportsExceptionHandling; // Defaults to false.
/// RequiresFrameSection - true if the Dwarf2 output needs a frame section
///
bool DwarfRequiresFrameSection; // Defaults to true.
/// GlobalEHDirective - This is the directive used to make exception frame
/// tables globally visible.
///
const char *GlobalEHDirective; // Defaults to NULL.
/// SupportsWeakEmptyEHFrame - True if target assembler and linker will
/// handle a weak_definition of constant 0 for an omitted EH frame.
bool SupportsWeakOmittedEHFrame; // Defaults to true.
/// DwarfSectionOffsetDirective - Special section offset directive.
const char* DwarfSectionOffsetDirective; // Defaults to NULL
/// DwarfAbbrevSection - Section directive for Dwarf abbrev.
///
const char *DwarfAbbrevSection; // Defaults to ".debug_abbrev".
/// DwarfInfoSection - Section directive for Dwarf info.
///
const char *DwarfInfoSection; // Defaults to ".debug_info".
/// DwarfLineSection - Section directive for Dwarf info.
///
const char *DwarfLineSection; // Defaults to ".debug_line".
/// DwarfFrameSection - Section directive for Dwarf info.
///
const char *DwarfFrameSection; // Defaults to ".debug_frame".
/// DwarfPubNamesSection - Section directive for Dwarf info.
///
const char *DwarfPubNamesSection; // Defaults to ".debug_pubnames".
/// DwarfPubTypesSection - Section directive for Dwarf info.
///
const char *DwarfPubTypesSection; // Defaults to ".debug_pubtypes".
/// DwarfStrSection - Section directive for Dwarf info.
///
const char *DwarfStrSection; // Defaults to ".debug_str".
/// DwarfLocSection - Section directive for Dwarf info.
///
const char *DwarfLocSection; // Defaults to ".debug_loc".
/// DwarfARangesSection - Section directive for Dwarf info.
///
const char *DwarfARangesSection; // Defaults to ".debug_aranges".
/// DwarfRangesSection - Section directive for Dwarf info.
///
const char *DwarfRangesSection; // Defaults to ".debug_ranges".
/// DwarfMacInfoSection - Section directive for Dwarf info.
///
const char *DwarfMacInfoSection; // Defaults to ".debug_macinfo".
/// DwarfEHFrameSection - Section directive for Exception frames.
///
const char *DwarfEHFrameSection; // Defaults to ".eh_frame".
/// DwarfExceptionSection - Section directive for Exception table.
///
const char *DwarfExceptionSection; // Defaults to ".gcc_except_table".
//===--- CBE Asm Translation Table -----------------------------------===//
const char *const *AsmTransCBE; // Defaults to empty
public:
TargetAsmInfo();
virtual ~TargetAsmInfo();
/// Measure the specified inline asm to determine an approximation of its
/// length.
virtual unsigned getInlineAsmLength(const char *Str) const;
/// ExpandInlineAsm - This hook allows the target to expand an inline asm
/// call to be explicit llvm code if it wants to. This is useful for
/// turning simple inline asms into LLVM intrinsics, which gives the
/// compiler more information about the behavior of the code.
virtual bool ExpandInlineAsm(CallInst *CI) const {
return false;
}
/// PreferredEHDataFormat - This hook allows the target to select data
/// format used for encoding pointers in exception handling data. Reason is
/// 0 for data, 1 for code labels, 2 for function pointers. Global is true
/// if the symbol can be relocated.
virtual unsigned PreferredEHDataFormat(DwarfEncoding::Target Reason,
bool Global) const;
/// SectionKindForGlobal - This hook allows the target to select proper
/// section kind used for global emission.
SectionKind::Kind SectionKindForGlobal(const GlobalValue *GV) const;
// Accessors.
//
const char *getTextSection() const {
return TextSection;
}
const char *getDataSection() const {
return DataSection;
}
const char *getBSSSection() const {
return BSSSection;
}
const char *getTLSDataSection() const {
return TLSDataSection;
}
const char *getTLSBSSSection() const {
return TLSBSSSection;
}
const char *getZeroFillDirective() const {
return ZeroFillDirective;
}
const char *getNonexecutableStackDirective() const {
return NonexecutableStackDirective;
}
bool needsSet() const {
return NeedsSet;
}
const char *getPCSymbol() const {
return PCSymbol;
}
char getSeparatorChar() const {
return SeparatorChar;
}
const char *getCommentString() const {
return CommentString;
}
const char *getGlobalPrefix() const {
return GlobalPrefix;
}
const char *getPrivateGlobalPrefix() const {
return PrivateGlobalPrefix;
}
const char *getJumpTableSpecialLabelPrefix() const {
return JumpTableSpecialLabelPrefix;
}
const char *getGlobalVarAddrPrefix() const {
return GlobalVarAddrPrefix;
}
const char *getGlobalVarAddrSuffix() const {
return GlobalVarAddrSuffix;
}
const char *getFunctionAddrPrefix() const {
return FunctionAddrPrefix;
}
const char *getFunctionAddrSuffix() const {
return FunctionAddrSuffix;
}
const char *getPersonalityPrefix() const {
return PersonalityPrefix;
}
const char *getPersonalitySuffix() const {
return PersonalitySuffix;
}
bool getNeedsIndirectEncoding() const {
return NeedsIndirectEncoding;
}
const char *getInlineAsmStart() const {
return InlineAsmStart;
}
const char *getInlineAsmEnd() const {
return InlineAsmEnd;
}
unsigned getAssemblerDialect() const {
return AssemblerDialect;
}
const char *getStringConstantPrefix() const {
return StringConstantPrefix;
}
const char *getZeroDirective() const {
return ZeroDirective;
}
const char *getZeroDirectiveSuffix() const {
return ZeroDirectiveSuffix;
}
const char *getAsciiDirective() const {
return AsciiDirective;
}
const char *getAscizDirective() const {
return AscizDirective;
}
const char *getData8bitsDirective() const {
return Data8bitsDirective;
}
const char *getData16bitsDirective() const {
return Data16bitsDirective;
}
const char *getData32bitsDirective() const {
return Data32bitsDirective;
}
const char *getData64bitsDirective() const {
return Data64bitsDirective;
}
const char *getJumpTableDirective() const {
return JumpTableDirective;
}
const char *getAlignDirective() const {
return AlignDirective;
}
bool getAlignmentIsInBytes() const {
return AlignmentIsInBytes;
}
unsigned getTextAlignFillValue() const {
return TextAlignFillValue;
}
const char *getSwitchToSectionDirective() const {
return SwitchToSectionDirective;
}
const char *getTextSectionStartSuffix() const {
return TextSectionStartSuffix;
}
const char *getDataSectionStartSuffix() const {
return DataSectionStartSuffix;
}
const char *getSectionEndDirectiveSuffix() const {
return SectionEndDirectiveSuffix;
}
const char *getConstantPoolSection() const {
return ConstantPoolSection;
}
const char *getJumpTableDataSection() const {
return JumpTableDataSection;
}
const char *getCStringSection() const {
return CStringSection;
}
const char *getStaticCtorsSection() const {
return StaticCtorsSection;
}
const char *getStaticDtorsSection() const {
return StaticDtorsSection;
}
const char *getFourByteConstantSection() const {
return FourByteConstantSection;
}
const char *getEightByteConstantSection() const {
return EightByteConstantSection;
}
const char *getSixteenByteConstantSection() const {
return SixteenByteConstantSection;
}
const char *getReadOnlySection() const {
return ReadOnlySection;
}
const char *getGlobalDirective() const {
return GlobalDirective;
}
const char *getSetDirective() const {
return SetDirective;
}
const char *getLCOMMDirective() const {
return LCOMMDirective;
}
const char *getCOMMDirective() const {
return COMMDirective;
}
bool getCOMMDirectiveTakesAlignment() const {
return COMMDirectiveTakesAlignment;
}
bool hasDotTypeDotSizeDirective() const {
return HasDotTypeDotSizeDirective;
}
const char *getUsedDirective() const {
return UsedDirective;
}
const char *getWeakRefDirective() const {
return WeakRefDirective;
}
const char *getWeakDefDirective() const {
return WeakDefDirective;
}
const char *getHiddenDirective() const {
return HiddenDirective;
}
const char *getProtectedDirective() const {
return ProtectedDirective;
}
bool isAbsoluteDebugSectionOffsets() const {
return AbsoluteDebugSectionOffsets;
}
bool isAbsoluteEHSectionOffsets() const {
return AbsoluteEHSectionOffsets;
}
bool hasLEB128() const {
return HasLEB128;
}
bool hasDotLocAndDotFile() const {
return HasDotLocAndDotFile;
}
bool doesSupportDebugInformation() const {
return SupportsDebugInformation;
}
bool doesSupportExceptionHandling() const {
return SupportsExceptionHandling;
}
bool doesDwarfRequireFrameSection() const {
return DwarfRequiresFrameSection;
}
const char *getGlobalEHDirective() const {
return GlobalEHDirective;
}
bool getSupportsWeakOmittedEHFrame() const {
return SupportsWeakOmittedEHFrame;
}
const char *getDwarfSectionOffsetDirective() const {
return DwarfSectionOffsetDirective;
}
const char *getDwarfAbbrevSection() const {
return DwarfAbbrevSection;
}
const char *getDwarfInfoSection() const {
return DwarfInfoSection;
}
const char *getDwarfLineSection() const {
return DwarfLineSection;
}
const char *getDwarfFrameSection() const {
return DwarfFrameSection;
}
const char *getDwarfPubNamesSection() const {
return DwarfPubNamesSection;
}
const char *getDwarfPubTypesSection() const {
return DwarfPubTypesSection;
}
const char *getDwarfStrSection() const {
return DwarfStrSection;
}
const char *getDwarfLocSection() const {
return DwarfLocSection;
}
const char *getDwarfARangesSection() const {
return DwarfARangesSection;
}
const char *getDwarfRangesSection() const {
return DwarfRangesSection;
}
const char *getDwarfMacInfoSection() const {
return DwarfMacInfoSection;
}
const char *getDwarfEHFrameSection() const {
return DwarfEHFrameSection;
}
const char *getDwarfExceptionSection() const {
return DwarfExceptionSection;
}
const char *const *getAsmCBE() const {
return AsmTransCBE;
}
};
}
#endif
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