llvm-6502/include/llvm/MC/MCAsmInfo.h
Logan Chien 80668d18e8 Move get[S|U]LEB128Size() to LEB128.h.
This commit moves getSLEB128Size() and getULEB128Size() from
MCAsmInfo to LEB128.h and removes some copy-and-paste code.

Besides, this commit also adds some unit tests for the LEB128
functions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201937 91177308-0d34-0410-b5e6-96231b3b80d8
2014-02-22 14:00:39 +00:00

545 lines
21 KiB
C++

//===-- llvm/MC/MCAsmInfo.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_MC_MCASMINFO_H
#define LLVM_MC_MCASMINFO_H
#include "llvm/MC/MCDirectives.h"
#include "llvm/MC/MCDwarf.h"
#include "llvm/MC/MachineLocation.h"
#include <cassert>
#include <vector>
namespace llvm {
class MCExpr;
class MCSection;
class MCStreamer;
class MCSymbol;
class MCContext;
namespace ExceptionHandling {
enum ExceptionsType { None, DwarfCFI, SjLj, ARM, Win64 };
}
namespace LCOMM {
enum LCOMMType { NoAlignment, ByteAlignment, Log2Alignment };
}
/// MCAsmInfo - This class is intended to be used as a base class for asm
/// properties and features specific to the target.
class MCAsmInfo {
protected:
//===------------------------------------------------------------------===//
// Properties to be set by the target writer, used to configure asm printer.
//
/// PointerSize - Pointer size in bytes.
/// Default is 4.
unsigned PointerSize;
/// CalleeSaveStackSlotSize - Size of the stack slot reserved for
/// callee-saved registers, in bytes.
/// Default is same as pointer size.
unsigned CalleeSaveStackSlotSize;
/// IsLittleEndian - True if target is little endian.
/// Default is true.
bool IsLittleEndian;
/// StackGrowsUp - True if target stack grow up.
/// Default is false.
bool StackGrowsUp;
/// HasSubsectionsViaSymbols - True if this target has the MachO
/// .subsections_via_symbols directive.
bool HasSubsectionsViaSymbols; // Default is false.
/// HasMachoZeroFillDirective - True if this is a MachO target that supports
/// the macho-specific .zerofill directive for emitting BSS Symbols.
bool HasMachoZeroFillDirective; // Default is false.
/// HasMachoTBSSDirective - True if this is a MachO target that supports
/// the macho-specific .tbss directive for emitting thread local BSS Symbols
bool HasMachoTBSSDirective; // Default is false.
/// HasStaticCtorDtorReferenceInStaticMode - True if the compiler should
/// emit a ".reference .constructors_used" or ".reference .destructors_used"
/// directive after the a static ctor/dtor list. This directive is only
/// emitted in Static relocation model.
bool HasStaticCtorDtorReferenceInStaticMode; // Default is false.
/// LinkerRequiresNonEmptyDwarfLines - True if the linker has a bug and
/// requires that the debug_line section be of a minimum size. In practice
/// such a linker requires a non-empty line sequence if a file is present.
bool LinkerRequiresNonEmptyDwarfLines; // Default 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.
/// MinInstAlignment - Every possible instruction length is a multiple of
/// this value. Factored out in .debug_frame and .debug_line.
unsigned MinInstAlignment; // Defaults to 1.
/// DollarIsPC - The '$' token, when not referencing an identifier or
/// constant, refers to the current PC.
bool DollarIsPC; // Defaults to false.
/// SeparatorString - This string, if specified, is used to separate
/// instructions from each other when on the same line.
const char *SeparatorString; // Defaults to ';'
/// CommentString - This indicates the comment character used by the
/// assembler.
const char *CommentString; // Defaults to "#"
/// LabelSuffix - This is appended to emitted labels.
const char *LabelSuffix; // Defaults to ":"
/// LabelSuffix - This is appended to emitted labels.
const char *DebugLabelSuffix; // Defaults to ":"
/// This prefix is used for globals like constant pool entries that are
/// completely private to the .s file and should not have names in the .o
/// file.
const char *PrivateGlobalPrefix; // Defaults to "L"
/// InlineAsmStart/End - If these are nonempty, they contain a directive to
/// emit before and after an inline assembly statement.
const char *InlineAsmStart; // Defaults to "#APP\n"
const char *InlineAsmEnd; // Defaults to "#NO_APP\n"
/// Code16Directive, Code32Directive, Code64Directive - These are assembly
/// directives that tells the assembler to interpret the following
/// instructions differently.
const char *Code16Directive; // Defaults to ".code16"
const char *Code32Directive; // Defaults to ".code32"
const char *Code64Directive; // Defaults to ".code64"
/// AssemblerDialect - Which dialect of an assembler variant to use.
unsigned AssemblerDialect; // Defaults to 0
/// \brief This is true if the assembler allows @ characters in symbol
/// names. Defaults to false.
bool AllowAtInName;
/// UseDataRegionDirectives - This is true if data region markers should
/// be printed as ".data_region/.end_data_region" directives. If false,
/// use "$d/$a" labels instead.
bool UseDataRegionDirectives;
//===--- 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"
/// 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"
/// GPRel64Directive - if non-null, a directive that is used to emit a word
/// which should be relocated as a 64-bit GP-relative offset, e.g. .gpdword
/// on Mips.
const char *GPRel64Directive; // Defaults to NULL.
/// GPRel32Directive - if non-null, a directive that is used to emit a word
/// which should be relocated as a 32-bit GP-relative offset, e.g. .gpword
/// on Mips or .gprel32 on Alpha.
const char *GPRel32Directive; // Defaults to NULL.
/// SunStyleELFSectionSwitchSyntax - This is true if this target uses "Sun
/// Style" syntax for section switching ("#alloc,#write" etc) instead of the
/// normal ELF syntax (,"a,w") in .section directives.
bool SunStyleELFSectionSwitchSyntax; // Defaults to false.
/// UsesELFSectionDirectiveForBSS - This is true if this target uses ELF
/// '.section' directive before the '.bss' one. It's used for PPC/Linux
/// which doesn't support the '.bss' directive only.
bool UsesELFSectionDirectiveForBSS; // Defaults to false.
bool NeedsDwarfSectionOffsetDirective;
//===--- Alignment Information ----------------------------------------===//
/// 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; // Defaults to 0
//===--- Global Variable Emission Directives --------------------------===//
/// GlobalDirective - This is the directive used to declare a global entity.
///
const char *GlobalDirective; // Defaults to NULL.
/// HasSetDirective - True if the assembler supports the .set directive.
bool HasSetDirective; // Defaults to true.
/// HasAggressiveSymbolFolding - False if the assembler requires that we use
/// Lc = a - b
/// .long Lc
/// instead of
/// .long a - b
bool HasAggressiveSymbolFolding; // Defaults to true.
/// COMMDirectiveAlignmentIsInBytes - True is .comm's and .lcomms optional
/// alignment is to be specified in bytes instead of log2(n).
bool COMMDirectiveAlignmentIsInBytes; // Defaults to true;
/// LCOMMDirectiveAlignment - Describes if the .lcomm directive for the
/// target supports an alignment argument and how it is interpreted.
LCOMM::LCOMMType LCOMMDirectiveAlignmentType; // Defaults to NoAlignment.
/// HasDotTypeDotSizeDirective - True if the target has .type and .size
/// directives, this is true for most ELF targets.
bool HasDotTypeDotSizeDirective; // Defaults to true.
/// HasSingleParameterDotFile - True if the target has a single parameter
/// .file directive, this is true for ELF targets.
bool HasSingleParameterDotFile; // Defaults to true.
/// hasIdentDirective - True if the target has a .ident directive, this is
/// true for ELF targets.
bool HasIdentDirective; // Defaults to false.
/// HasNoDeadStrip - True if this target supports the MachO .no_dead_strip
/// directive.
bool HasNoDeadStrip; // Defaults to false.
/// WeakRefDirective - This directive, if non-null, is used to declare a
/// global as being a weak undefined symbol.
const char *WeakRefDirective; // Defaults to NULL.
/// True if we have a directive to declare a global as being a weak
/// defined symbol.
bool HasWeakDefDirective; // Defaults to false.
/// True if we have a directive to declare a global as being a weak
/// defined symbol that can be hidden (unexported).
bool HasWeakDefCanBeHiddenDirective; // Defaults to false.
/// True if we have a .linkonce directive. This is used on cygwin/mingw.
bool HasLinkOnceDirective; // Defaults to false.
/// HiddenVisibilityAttr - This attribute, if not MCSA_Invalid, is used to
/// declare a symbol as having hidden visibility.
MCSymbolAttr HiddenVisibilityAttr; // Defaults to MCSA_Hidden.
/// HiddenDeclarationVisibilityAttr - This attribute, if not MCSA_Invalid,
/// is used to declare an undefined symbol as having hidden visibility.
MCSymbolAttr HiddenDeclarationVisibilityAttr; // Defaults to MCSA_Hidden.
/// ProtectedVisibilityAttr - This attribute, if not MCSA_Invalid, is used
/// to declare a symbol as having protected visibility.
MCSymbolAttr ProtectedVisibilityAttr; // Defaults to MCSA_Protected
//===--- Dwarf Emission Directives -----------------------------------===//
/// HasLEB128 - True if target asm supports leb128 directives.
bool HasLEB128; // Defaults to false.
/// SupportsDebugInformation - True if target supports emission of debugging
/// information.
bool SupportsDebugInformation; // Defaults to false.
/// SupportsExceptionHandling - True if target supports exception handling.
ExceptionHandling::ExceptionsType ExceptionsType; // Defaults to None
/// DwarfUsesRelocationsAcrossSections - True if Dwarf2 output generally
/// uses relocations for references to other .debug_* sections.
bool DwarfUsesRelocationsAcrossSections;
/// DwarfFDESymbolsUseAbsDiff - true if DWARF FDE symbol reference
/// relocations should be replaced by an absolute difference.
bool DwarfFDESymbolsUseAbsDiff;
/// DwarfRegNumForCFI - True if dwarf register numbers are printed
/// instead of symbolic register names in .cfi_* directives.
bool DwarfRegNumForCFI; // Defaults to false;
/// UseParensForSymbolVariant - True if target uses parens to indicate the
/// symbol variant instead of @. For example, foo(plt) instead of foo@plt.
bool UseParensForSymbolVariant; // Defaults to false;
//===--- Prologue State ----------------------------------------------===//
std::vector<MCCFIInstruction> InitialFrameState;
//===--- Integrated Assembler State ----------------------------------===//
/// Should we use the integrated assembler?
/// The integrated assembler should be enabled by default (by the
/// constructors) when failing to parse a valid piece of assembly (inline
/// or otherwise) is considered a bug. It may then be overridden after
/// construction (see LLVMTargetMachine::initAsmInfo()).
bool UseIntegratedAssembler;
public:
explicit MCAsmInfo();
virtual ~MCAsmInfo();
/// getPointerSize - Get the pointer size in bytes.
unsigned getPointerSize() const {
return PointerSize;
}
/// getCalleeSaveStackSlotSize - Get the callee-saved register stack slot
/// size in bytes.
unsigned getCalleeSaveStackSlotSize() const {
return CalleeSaveStackSlotSize;
}
/// isLittleEndian - True if the target is little endian.
bool isLittleEndian() const {
return IsLittleEndian;
}
/// isStackGrowthDirectionUp - True if target stack grow up.
bool isStackGrowthDirectionUp() const {
return StackGrowsUp;
}
bool hasSubsectionsViaSymbols() const { return HasSubsectionsViaSymbols; }
// Data directive accessors.
//
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 *getGPRel64Directive() const { return GPRel64Directive; }
const char *getGPRel32Directive() const { return GPRel32Directive; }
/// getNonexecutableStackSection - Targets can implement this method to
/// specify a section to switch to if the translation unit doesn't have any
/// trampolines that require an executable stack.
virtual const MCSection *getNonexecutableStackSection(MCContext &Ctx) const{
return 0;
}
virtual const MCExpr *
getExprForPersonalitySymbol(const MCSymbol *Sym,
unsigned Encoding,
MCStreamer &Streamer) const;
virtual const MCExpr *
getExprForFDESymbol(const MCSymbol *Sym,
unsigned Encoding,
MCStreamer &Streamer) const;
bool usesSunStyleELFSectionSwitchSyntax() const {
return SunStyleELFSectionSwitchSyntax;
}
bool usesELFSectionDirectiveForBSS() const {
return UsesELFSectionDirectiveForBSS;
}
bool needsDwarfSectionOffsetDirective() const {
return NeedsDwarfSectionOffsetDirective;
}
// Accessors.
//
bool hasMachoZeroFillDirective() const { return HasMachoZeroFillDirective; }
bool hasMachoTBSSDirective() const { return HasMachoTBSSDirective; }
bool hasStaticCtorDtorReferenceInStaticMode() const {
return HasStaticCtorDtorReferenceInStaticMode;
}
bool getLinkerRequiresNonEmptyDwarfLines() const {
return LinkerRequiresNonEmptyDwarfLines;
}
unsigned getMaxInstLength() const {
return MaxInstLength;
}
unsigned getMinInstAlignment() const {
return MinInstAlignment;
}
bool getDollarIsPC() const {
return DollarIsPC;
}
const char *getSeparatorString() const {
return SeparatorString;
}
/// This indicates the column (zero-based) at which asm comments should be
/// printed.
unsigned getCommentColumn() const {
return 40;
}
const char *getCommentString() const {
return CommentString;
}
const char *getLabelSuffix() const {
return LabelSuffix;
}
const char *getDebugLabelSuffix() const {
return DebugLabelSuffix;
}
const char *getPrivateGlobalPrefix() const {
return PrivateGlobalPrefix;
}
const char *getInlineAsmStart() const {
return InlineAsmStart;
}
const char *getInlineAsmEnd() const {
return InlineAsmEnd;
}
const char *getCode16Directive() const {
return Code16Directive;
}
const char *getCode32Directive() const {
return Code32Directive;
}
const char *getCode64Directive() const {
return Code64Directive;
}
unsigned getAssemblerDialect() const {
return AssemblerDialect;
}
bool doesAllowAtInName() const {
return AllowAtInName;
}
bool doesSupportDataRegionDirectives() const {
return UseDataRegionDirectives;
}
const char *getZeroDirective() const {
return ZeroDirective;
}
const char *getAsciiDirective() const {
return AsciiDirective;
}
const char *getAscizDirective() const {
return AscizDirective;
}
bool getAlignmentIsInBytes() const {
return AlignmentIsInBytes;
}
unsigned getTextAlignFillValue() const {
return TextAlignFillValue;
}
const char *getGlobalDirective() const {
return GlobalDirective;
}
bool hasSetDirective() const { return HasSetDirective; }
bool hasAggressiveSymbolFolding() const {
return HasAggressiveSymbolFolding;
}
bool getCOMMDirectiveAlignmentIsInBytes() const {
return COMMDirectiveAlignmentIsInBytes;
}
LCOMM::LCOMMType getLCOMMDirectiveAlignmentType() const {
return LCOMMDirectiveAlignmentType;
}
bool hasDotTypeDotSizeDirective() const {return HasDotTypeDotSizeDirective;}
bool hasSingleParameterDotFile() const { return HasSingleParameterDotFile; }
bool hasIdentDirective() const { return HasIdentDirective; }
bool hasNoDeadStrip() const { return HasNoDeadStrip; }
const char *getWeakRefDirective() const { return WeakRefDirective; }
bool hasWeakDefDirective() const { return HasWeakDefDirective; }
bool hasWeakDefCanBeHiddenDirective() const {
return HasWeakDefCanBeHiddenDirective;
}
bool hasLinkOnceDirective() const { return HasLinkOnceDirective; }
MCSymbolAttr getHiddenVisibilityAttr() const { return HiddenVisibilityAttr;}
MCSymbolAttr getHiddenDeclarationVisibilityAttr() const {
return HiddenDeclarationVisibilityAttr;
}
MCSymbolAttr getProtectedVisibilityAttr() const {
return ProtectedVisibilityAttr;
}
bool hasLEB128() const {
return HasLEB128;
}
bool doesSupportDebugInformation() const {
return SupportsDebugInformation;
}
bool doesSupportExceptionHandling() const {
return ExceptionsType != ExceptionHandling::None;
}
ExceptionHandling::ExceptionsType getExceptionHandlingType() const {
return ExceptionsType;
}
bool isExceptionHandlingDwarf() const {
return
(ExceptionsType == ExceptionHandling::DwarfCFI ||
ExceptionsType == ExceptionHandling::ARM ||
ExceptionsType == ExceptionHandling::Win64);
}
bool doesDwarfUseRelocationsAcrossSections() const {
return DwarfUsesRelocationsAcrossSections;
}
bool doDwarfFDESymbolsUseAbsDiff() const {
return DwarfFDESymbolsUseAbsDiff;
}
bool useDwarfRegNumForCFI() const {
return DwarfRegNumForCFI;
}
bool useParensForSymbolVariant() const {
return UseParensForSymbolVariant;
}
void addInitialFrameState(const MCCFIInstruction &Inst) {
InitialFrameState.push_back(Inst);
}
const std::vector<MCCFIInstruction> &getInitialFrameState() const {
return InitialFrameState;
}
/// Return true if assembly (inline or otherwise) should be parsed.
bool useIntegratedAssembler() const { return UseIntegratedAssembler; }
/// Set whether assembly (inline or otherwise) should be parsed.
void setUseIntegratedAssembler(bool Value) {
UseIntegratedAssembler = Value;
}
};
}
#endif