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455 lines
18 KiB
C++
455 lines
18 KiB
C++
//===-- llvm/MC/MCAsmInfo.h - Asm info --------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains a class to be used as the basis for target specific
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// asm writers. This class primarily takes care of global printing constants,
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// which are used in very similar ways across all targets.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TARGET_ASM_INFO_H
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#define LLVM_TARGET_ASM_INFO_H
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#include "llvm/MC/MCDirectives.h"
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#include <cassert>
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namespace llvm {
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class MCSection;
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class MCContext;
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/// MCAsmInfo - This class is intended to be used as a base class for asm
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/// properties and features specific to the target.
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namespace ExceptionHandling { enum ExceptionsType { None, Dwarf, SjLj }; }
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class MCAsmInfo {
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protected:
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//===------------------------------------------------------------------===//
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// Properties to be set by the target writer, used to configure asm printer.
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//
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/// HasSubsectionsViaSymbols - True if this target has the MachO
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/// .subsections_via_symbols directive.
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bool HasSubsectionsViaSymbols; // Default is false.
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/// HasMachoZeroFillDirective - True if this is a MachO target that supports
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/// the macho-specific .zerofill directive for emitting BSS Symbols.
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bool HasMachoZeroFillDirective; // Default is false.
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/// HasStaticCtorDtorReferenceInStaticMode - True if the compiler should
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/// emit a ".reference .constructors_used" or ".reference .destructors_used"
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/// directive after the a static ctor/dtor list. This directive is only
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/// emitted in Static relocation model.
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bool HasStaticCtorDtorReferenceInStaticMode; // Default is false.
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/// NeedsSet - True if target asm treats expressions in data directives
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/// as linktime-relocatable. For assembly-time computation, we need to
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/// use a .set. Thus:
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/// .set w, x-y
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/// .long w
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/// is computed at assembly time, while
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/// .long x-y
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/// is relocated if the relative locations of x and y change at linktime.
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/// We want both these things in different places.
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bool NeedsSet; // Defaults to false.
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/// MaxInstLength - This is the maximum possible length of an instruction,
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/// which is needed to compute the size of an inline asm.
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unsigned MaxInstLength; // Defaults to 4.
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/// PCSymbol - The symbol used to represent the current PC. Used in PC
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/// relative expressions.
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const char *PCSymbol; // Defaults to "$".
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/// SeparatorChar - This character, if specified, is used to separate
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/// instructions from each other when on the same line. This is used to
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/// measure inline asm instructions.
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char SeparatorChar; // Defaults to ';'
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/// CommentColumn - This indicates the comment num (zero-based) at
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/// which asm comments should be printed.
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unsigned CommentColumn; // Defaults to 60
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/// CommentString - This indicates the comment character used by the
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/// assembler.
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const char *CommentString; // Defaults to "#"
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/// GlobalPrefix - If this is set to a non-empty string, it is prepended
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/// onto all global symbols. This is often used for "_" or ".".
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const char *GlobalPrefix; // Defaults to ""
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/// PrivateGlobalPrefix - This prefix is used for globals like constant
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/// pool entries that are completely private to the .s file and should not
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/// have names in the .o file. This is often "." or "L".
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const char *PrivateGlobalPrefix; // Defaults to "."
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/// LinkerPrivateGlobalPrefix - This prefix is used for symbols that should
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/// be passed through the assembler but be removed by the linker. This
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/// is "l" on Darwin, currently used for some ObjC metadata.
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const char *LinkerPrivateGlobalPrefix; // Defaults to ""
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/// InlineAsmStart/End - If these are nonempty, they contain a directive to
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/// emit before and after an inline assembly statement.
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const char *InlineAsmStart; // Defaults to "#APP\n"
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const char *InlineAsmEnd; // Defaults to "#NO_APP\n"
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/// AssemblerDialect - Which dialect of an assembler variant to use.
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unsigned AssemblerDialect; // Defaults to 0
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/// AllowQuotesInName - This is true if the assembler allows for complex
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/// symbol names to be surrounded in quotes. This defaults to false.
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bool AllowQuotesInName;
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/// AllowNameToStartWithDigit - This is true if the assembler allows symbol
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/// names to start with a digit (e.g., "0x0021"). This defaults to false.
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bool AllowNameToStartWithDigit;
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//===--- Data Emission Directives -------------------------------------===//
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/// ZeroDirective - this should be set to the directive used to get some
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/// number of zero bytes emitted to the current section. Common cases are
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/// "\t.zero\t" and "\t.space\t". If this is set to null, the
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/// Data*bitsDirective's will be used to emit zero bytes.
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const char *ZeroDirective; // Defaults to "\t.zero\t"
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/// AsciiDirective - This directive allows emission of an ascii string with
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/// the standard C escape characters embedded into it.
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const char *AsciiDirective; // Defaults to "\t.ascii\t"
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/// AscizDirective - If not null, this allows for special handling of
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/// zero terminated strings on this target. This is commonly supported as
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/// ".asciz". If a target doesn't support this, it can be set to null.
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const char *AscizDirective; // Defaults to "\t.asciz\t"
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/// DataDirectives - These directives are used to output some unit of
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/// integer data to the current section. If a data directive is set to
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/// null, smaller data directives will be used to emit the large sizes.
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const char *Data8bitsDirective; // Defaults to "\t.byte\t"
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const char *Data16bitsDirective; // Defaults to "\t.short\t"
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const char *Data32bitsDirective; // Defaults to "\t.long\t"
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const char *Data64bitsDirective; // Defaults to "\t.quad\t"
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/// getDataASDirective - Return the directive that should be used to emit
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/// data of the specified size to the specified numeric address space.
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virtual const char *getDataASDirective(unsigned Size, unsigned AS) const {
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assert(AS != 0 && "Don't know the directives for default addr space");
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return 0;
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}
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/// SunStyleELFSectionSwitchSyntax - This is true if this target uses "Sun
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/// Style" syntax for section switching ("#alloc,#write" etc) instead of the
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/// normal ELF syntax (,"a,w") in .section directives.
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bool SunStyleELFSectionSwitchSyntax; // Defaults to false.
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/// UsesELFSectionDirectiveForBSS - This is true if this target uses ELF
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/// '.section' directive before the '.bss' one. It's used for PPC/Linux
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/// which doesn't support the '.bss' directive only.
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bool UsesELFSectionDirectiveForBSS; // Defaults to false.
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//===--- Alignment Information ----------------------------------------===//
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/// AlignDirective - The directive used to emit round up to an alignment
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/// boundary.
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///
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const char *AlignDirective; // Defaults to "\t.align\t"
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/// AlignmentIsInBytes - If this is true (the default) then the asmprinter
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/// emits ".align N" directives, where N is the number of bytes to align to.
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/// Otherwise, it emits ".align log2(N)", e.g. 3 to align to an 8 byte
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/// boundary.
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bool AlignmentIsInBytes; // Defaults to true
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/// TextAlignFillValue - If non-zero, this is used to fill the executable
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/// space created as the result of a alignment directive.
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unsigned TextAlignFillValue; // Defaults to 0
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//===--- Section Switching Directives ---------------------------------===//
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/// PICJumpTableDirective - if non-null, the directive to emit before jump
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/// table entries. FIXME: REMOVE THIS.
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const char *PICJumpTableDirective; // Defaults to NULL.
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//===--- Global Variable Emission Directives --------------------------===//
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/// GlobalDirective - This is the directive used to declare a global entity.
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///
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const char *GlobalDirective; // Defaults to NULL.
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/// ExternDirective - This is the directive used to declare external
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/// globals.
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///
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const char *ExternDirective; // Defaults to NULL.
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/// SetDirective - This is the name of a directive that can be used to tell
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/// the assembler to set the value of a variable to some expression.
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const char *SetDirective; // Defaults to null.
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/// HasLCOMMDirective - This is true if the target supports the .lcomm
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/// directive.
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bool HasLCOMMDirective; // Defaults to false.
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/// HasDotTypeDotSizeDirective - True if the target has .type and .size
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/// directives, this is true for most ELF targets.
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bool HasDotTypeDotSizeDirective; // Defaults to true.
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/// HasSingleParameterDotFile - True if the target has a single parameter
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/// .file directive, this is true for ELF targets.
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bool HasSingleParameterDotFile; // Defaults to true.
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/// HasNoDeadStrip - True if this target supports the MachO .no_dead_strip
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/// directive.
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bool HasNoDeadStrip; // Defaults to false.
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/// WeakRefDirective - This directive, if non-null, is used to declare a
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/// global as being a weak undefined symbol.
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const char *WeakRefDirective; // Defaults to NULL.
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/// WeakDefDirective - This directive, if non-null, is used to declare a
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/// global as being a weak defined symbol.
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const char *WeakDefDirective; // Defaults to NULL.
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/// LinkOnceDirective - This directive, if non-null is used to declare a
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/// global as being a weak defined symbol. This is used on cygwin/mingw.
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const char *LinkOnceDirective; // Defaults to NULL.
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/// HiddenVisibilityAttr - This attribute, if not MCSA_Invalid, is used to
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/// declare a symbol as having hidden visibility.
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MCSymbolAttr HiddenVisibilityAttr; // Defaults to MCSA_Hidden.
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/// ProtectedVisibilityAttr - This attribute, if not MCSA_Invalid, is used
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/// to declare a symbol as having protected visibility.
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MCSymbolAttr ProtectedVisibilityAttr; // Defaults to MCSA_Protected
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//===--- Dwarf Emission Directives -----------------------------------===//
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/// AbsoluteDebugSectionOffsets - True if we should emit abolute section
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/// offsets for debug information.
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bool AbsoluteDebugSectionOffsets; // Defaults to false.
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/// AbsoluteEHSectionOffsets - True if we should emit abolute section
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/// offsets for EH information. Defaults to false.
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bool AbsoluteEHSectionOffsets;
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/// HasLEB128 - True if target asm supports leb128 directives.
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bool HasLEB128; // Defaults to false.
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/// hasDotLocAndDotFile - True if target asm supports .loc and .file
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/// directives for emitting debugging information.
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bool HasDotLocAndDotFile; // Defaults to false.
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/// SupportsDebugInformation - True if target supports emission of debugging
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/// information.
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bool SupportsDebugInformation; // Defaults to false.
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/// SupportsExceptionHandling - True if target supports exception handling.
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ExceptionHandling::ExceptionsType ExceptionsType; // Defaults to None
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/// RequiresFrameSection - true if the Dwarf2 output needs a frame section
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bool DwarfRequiresFrameSection; // Defaults to true.
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/// DwarfUsesInlineInfoSection - True if DwarfDebugInlineSection is used to
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/// encode inline subroutine information.
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bool DwarfUsesInlineInfoSection; // Defaults to false.
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/// Is_EHSymbolPrivate - If set, the "_foo.eh" is made private so that it
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/// doesn't show up in the symbol table of the object file.
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bool Is_EHSymbolPrivate; // Defaults to true.
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/// GlobalEHDirective - This is the directive used to make exception frame
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/// tables globally visible.
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const char *GlobalEHDirective; // Defaults to NULL.
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/// SupportsWeakEmptyEHFrame - True if target assembler and linker will
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/// handle a weak_definition of constant 0 for an omitted EH frame.
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bool SupportsWeakOmittedEHFrame; // Defaults to true.
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/// DwarfSectionOffsetDirective - Special section offset directive.
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const char* DwarfSectionOffsetDirective; // Defaults to NULL
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//===--- CBE Asm Translation Table -----------------------------------===//
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const char *const *AsmTransCBE; // Defaults to empty
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public:
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explicit MCAsmInfo();
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virtual ~MCAsmInfo();
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// FIXME: move these methods to DwarfPrinter when the JIT stops using them.
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static unsigned getSLEB128Size(int Value);
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static unsigned getULEB128Size(unsigned Value);
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bool hasSubsectionsViaSymbols() const { return HasSubsectionsViaSymbols; }
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// Data directive accessors.
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//
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const char *getData8bitsDirective(unsigned AS = 0) const {
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return AS == 0 ? Data8bitsDirective : getDataASDirective(8, AS);
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}
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const char *getData16bitsDirective(unsigned AS = 0) const {
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return AS == 0 ? Data16bitsDirective : getDataASDirective(16, AS);
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}
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const char *getData32bitsDirective(unsigned AS = 0) const {
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return AS == 0 ? Data32bitsDirective : getDataASDirective(32, AS);
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}
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const char *getData64bitsDirective(unsigned AS = 0) const {
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return AS == 0 ? Data64bitsDirective : getDataASDirective(64, AS);
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}
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/// getNonexecutableStackSection - Targets can implement this method to
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/// specify a section to switch to if the translation unit doesn't have any
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/// trampolines that require an executable stack.
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virtual MCSection *getNonexecutableStackSection(MCContext &Ctx) const {
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return 0;
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}
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bool usesSunStyleELFSectionSwitchSyntax() const {
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return SunStyleELFSectionSwitchSyntax;
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}
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bool usesELFSectionDirectiveForBSS() const {
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return UsesELFSectionDirectiveForBSS;
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}
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// Accessors.
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//
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bool hasMachoZeroFillDirective() const { return HasMachoZeroFillDirective; }
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bool hasStaticCtorDtorReferenceInStaticMode() const {
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return HasStaticCtorDtorReferenceInStaticMode;
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}
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bool needsSet() const {
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return NeedsSet;
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}
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unsigned getMaxInstLength() const {
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return MaxInstLength;
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}
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const char *getPCSymbol() const {
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return PCSymbol;
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}
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char getSeparatorChar() const {
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return SeparatorChar;
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}
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unsigned getCommentColumn() const {
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return CommentColumn;
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}
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const char *getCommentString() const {
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return CommentString;
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}
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const char *getGlobalPrefix() const {
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return GlobalPrefix;
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}
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const char *getPrivateGlobalPrefix() const {
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return PrivateGlobalPrefix;
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}
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const char *getLinkerPrivateGlobalPrefix() const {
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return LinkerPrivateGlobalPrefix;
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}
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const char *getInlineAsmStart() const {
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return InlineAsmStart;
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}
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const char *getInlineAsmEnd() const {
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return InlineAsmEnd;
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}
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unsigned getAssemblerDialect() const {
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return AssemblerDialect;
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}
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bool doesAllowQuotesInName() const {
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return AllowQuotesInName;
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}
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bool doesAllowNameToStartWithDigit() const {
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return AllowNameToStartWithDigit;
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}
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const char *getZeroDirective() const {
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return ZeroDirective;
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}
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const char *getAsciiDirective() const {
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return AsciiDirective;
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}
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const char *getAscizDirective() const {
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return AscizDirective;
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}
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const char *getPICJumpTableDirective() const {
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return PICJumpTableDirective;
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}
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const char *getAlignDirective() const {
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return AlignDirective;
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}
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bool getAlignmentIsInBytes() const {
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return AlignmentIsInBytes;
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}
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unsigned getTextAlignFillValue() const {
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return TextAlignFillValue;
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}
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const char *getGlobalDirective() const {
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return GlobalDirective;
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}
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const char *getExternDirective() const {
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return ExternDirective;
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}
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const char *getSetDirective() const {
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return SetDirective;
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}
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bool hasLCOMMDirective() const { return HasLCOMMDirective; }
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bool hasDotTypeDotSizeDirective() const {return HasDotTypeDotSizeDirective;}
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bool hasSingleParameterDotFile() const { return HasSingleParameterDotFile; }
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bool hasNoDeadStrip() const { return HasNoDeadStrip; }
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const char *getWeakRefDirective() const { return WeakRefDirective; }
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const char *getWeakDefDirective() const { return WeakDefDirective; }
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const char *getLinkOnceDirective() const { return LinkOnceDirective; }
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MCSymbolAttr getHiddenVisibilityAttr() const { return HiddenVisibilityAttr;}
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MCSymbolAttr getProtectedVisibilityAttr() const {
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return ProtectedVisibilityAttr;
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}
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bool isAbsoluteDebugSectionOffsets() const {
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return AbsoluteDebugSectionOffsets;
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}
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bool isAbsoluteEHSectionOffsets() const {
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return AbsoluteEHSectionOffsets;
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}
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bool hasLEB128() const {
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return HasLEB128;
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}
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bool hasDotLocAndDotFile() const {
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return HasDotLocAndDotFile;
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}
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bool doesSupportDebugInformation() const {
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return SupportsDebugInformation;
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}
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bool doesSupportExceptionHandling() const {
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return ExceptionsType != ExceptionHandling::None;
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}
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ExceptionHandling::ExceptionsType getExceptionHandlingType() const {
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return ExceptionsType;
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}
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bool doesDwarfRequireFrameSection() const {
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return DwarfRequiresFrameSection;
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}
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bool doesDwarfUsesInlineInfoSection() const {
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return DwarfUsesInlineInfoSection;
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}
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bool is_EHSymbolPrivate() const {
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return Is_EHSymbolPrivate;
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}
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const char *getGlobalEHDirective() const {
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return GlobalEHDirective;
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}
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bool getSupportsWeakOmittedEHFrame() const {
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return SupportsWeakOmittedEHFrame;
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}
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const char *getDwarfSectionOffsetDirective() const {
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return DwarfSectionOffsetDirective;
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}
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const char *const *getAsmCBE() const {
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return AsmTransCBE;
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}
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};
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}
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#endif
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