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580 lines
23 KiB
580 lines
23 KiB
//===-- 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_MC_MCASMINFO_H
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#define LLVM_MC_MCASMINFO_H
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#include "llvm/MC/MCDirectives.h"
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#include "llvm/MC/MachineLocation.h"
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#include <cassert>
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#include <vector>
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namespace llvm {
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class MCExpr;
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class MCSection;
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class MCStreamer;
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class MCSymbol;
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class MCContext;
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namespace ExceptionHandling {
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enum ExceptionsType { None, DwarfCFI, SjLj, ARM, Win64 };
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}
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namespace LCOMM {
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enum LCOMMType { NoAlignment, ByteAlignment, Log2Alignment };
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}
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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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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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/// PointerSize - Pointer size in bytes.
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/// Default is 4.
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unsigned PointerSize;
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/// CalleeSaveStackSlotSize - Size of the stack slot reserved for
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/// callee-saved registers, in bytes.
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/// Default is same as pointer size.
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unsigned CalleeSaveStackSlotSize;
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/// IsLittleEndian - True if target is little endian.
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/// Default is true.
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bool IsLittleEndian;
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/// StackGrowsUp - True if target stack grow up.
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/// Default is false.
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bool StackGrowsUp;
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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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/// HasMachoTBSSDirective - True if this is a MachO target that supports
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/// the macho-specific .tbss directive for emitting thread local BSS Symbols
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bool HasMachoTBSSDirective; // 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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/// LinkerRequiresNonEmptyDwarfLines - True if the linker has a bug and
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/// requires that the debug_line section be of a minimum size. In practice
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/// such a linker requires a non empty line sequence if a file is present.
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bool LinkerRequiresNonEmptyDwarfLines; // Default 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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/// SeparatorString - This string, if specified, is used to separate
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/// instructions from each other when on the same line.
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const char *SeparatorString; // 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 40
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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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/// LabelSuffix - This is appended to emitted labels.
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const char *LabelSuffix; // Defaults to ":"
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/// LabelSuffix - This is appended to emitted labels.
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const char *DebugLabelSuffix; // 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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/// Code16Directive, Code32Directive, Code64Directive - These are assembly
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/// directives that tells the assembler to interpret the following
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/// instructions differently.
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const char *Code16Directive; // Defaults to ".code16"
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const char *Code32Directive; // Defaults to ".code32"
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const char *Code64Directive; // Defaults to ".code64"
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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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/// AllowPeriodsInName - This is true if the assembler allows periods in
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/// symbol names. This defaults to true.
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bool AllowPeriodsInName;
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/// AllowUTF8 - This is true if the assembler accepts UTF-8 input.
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// FIXME: Make this a more general encoding setting?
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bool AllowUTF8;
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/// UseDataRegionDirectives - This is true if data region markers should
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/// be printed as ".data_region/.end_data_region" directives. If false,
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/// use "$d/$a" labels instead.
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bool UseDataRegionDirectives;
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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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/// GPRel64Directive - if non-null, a directive that is used to emit a word
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/// which should be relocated as a 64-bit GP-relative offset, e.g. .gpdword
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/// on Mips.
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const char *GPRel64Directive; // Defaults to NULL.
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/// GPRel32Directive - if non-null, a directive that is used to emit a word
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/// which should be relocated as a 32-bit GP-relative offset, e.g. .gpword
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/// on Mips or .gprel32 on Alpha.
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const char *GPRel32Directive; // Defaults to NULL.
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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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/// HasMicrosoftFastStdCallMangling - True if this target uses microsoft
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/// style mangling for functions with X86_StdCall/X86_FastCall calling
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/// convention.
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bool HasMicrosoftFastStdCallMangling; // 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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//===--- 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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/// HasSetDirective - True if the assembler supports the .set directive.
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bool HasSetDirective; // Defaults to true.
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/// HasAggressiveSymbolFolding - False if the assembler requires that we use
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/// Lc = a - b
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/// .long Lc
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/// instead of
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/// .long a - b
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bool HasAggressiveSymbolFolding; // Defaults to true.
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/// COMMDirectiveAlignmentIsInBytes - True is .comm's and .lcomms optional
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/// alignment is to be specified in bytes instead of log2(n).
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bool COMMDirectiveAlignmentIsInBytes; // Defaults to true;
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/// LCOMMDirectiveAlignment - Describes if the .lcomm directive for the
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/// target supports an alignment argument and how it is interpreted.
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LCOMM::LCOMMType LCOMMDirectiveAlignmentType; // Defaults to NoAlignment.
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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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/// HasSymbolResolver - True if this target supports the MachO
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/// .symbol_resolver directive.
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bool HasSymbolResolver; // 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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/// HiddenDeclarationVisibilityAttr - This attribute, if not MCSA_Invalid,
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/// is used to declare an undefined symbol as having hidden visibility.
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MCSymbolAttr HiddenDeclarationVisibilityAttr; // 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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/// HasLEB128 - True if target asm supports leb128 directives.
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bool HasLEB128; // 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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/// 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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/// DwarfSectionOffsetDirective - Special section offset directive.
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const char* DwarfSectionOffsetDirective; // Defaults to NULL
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/// DwarfUsesRelocationsAcrossSections - True if Dwarf2 output generally
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/// uses relocations for references to other .debug_* sections.
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bool DwarfUsesRelocationsAcrossSections;
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/// DwarfRegNumForCFI - True if dwarf register numbers are printed
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/// instead of symbolic register names in .cfi_* directives.
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bool DwarfRegNumForCFI; // Defaults to false;
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//===--- Prologue State ----------------------------------------------===//
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std::vector<MachineMove> InitialFrameState;
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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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/// getPointerSize - Get the pointer size in bytes.
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unsigned getPointerSize() const {
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return PointerSize;
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}
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/// getCalleeSaveStackSlotSize - Get the callee-saved register stack slot
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/// size in bytes.
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unsigned getCalleeSaveStackSlotSize() const {
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return CalleeSaveStackSlotSize;
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}
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/// isLittleEndian - True if the target is little endian.
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bool isLittleEndian() const {
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return IsLittleEndian;
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}
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/// isStackGrowthDirectionUp - True if target stack grow up.
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bool isStackGrowthDirectionUp() const {
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return StackGrowsUp;
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}
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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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const char *getGPRel64Directive() const { return GPRel64Directive; }
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const char *getGPRel32Directive() const { return GPRel32Directive; }
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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 const MCSection *getNonexecutableStackSection(MCContext &Ctx) const{
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return 0;
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}
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virtual const MCExpr *
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getExprForPersonalitySymbol(const MCSymbol *Sym,
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unsigned Encoding,
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MCStreamer &Streamer) const;
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const MCExpr *
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getExprForFDESymbol(const MCSymbol *Sym,
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unsigned Encoding,
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MCStreamer &Streamer) const;
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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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bool hasMicrosoftFastStdCallMangling() const {
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return HasMicrosoftFastStdCallMangling;
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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 hasMachoTBSSDirective() const { return HasMachoTBSSDirective; }
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bool hasStaticCtorDtorReferenceInStaticMode() const {
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return HasStaticCtorDtorReferenceInStaticMode;
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}
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bool getLinkerRequiresNonEmptyDwarfLines() const {
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return LinkerRequiresNonEmptyDwarfLines;
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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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const char *getSeparatorString() const {
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return SeparatorString;
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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 *getLabelSuffix() const {
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return LabelSuffix;
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}
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const char *getDebugLabelSuffix() const {
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return DebugLabelSuffix;
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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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const char *getCode16Directive() const {
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return Code16Directive;
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}
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const char *getCode32Directive() const {
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return Code32Directive;
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}
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const char *getCode64Directive() const {
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return Code64Directive;
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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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bool doesAllowPeriodsInName() const {
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return AllowPeriodsInName;
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}
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bool doesAllowUTF8() const {
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return AllowUTF8;
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}
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bool doesSupportDataRegionDirectives() const {
|
|
return UseDataRegionDirectives;
|
|
}
|
|
const char *getZeroDirective() const {
|
|
return ZeroDirective;
|
|
}
|
|
const char *getAsciiDirective() const {
|
|
return AsciiDirective;
|
|
}
|
|
const char *getAscizDirective() const {
|
|
return AscizDirective;
|
|
}
|
|
const char *getAlignDirective() const {
|
|
return AlignDirective;
|
|
}
|
|
bool getAlignmentIsInBytes() const {
|
|
return AlignmentIsInBytes;
|
|
}
|
|
unsigned getTextAlignFillValue() const {
|
|
return TextAlignFillValue;
|
|
}
|
|
const char *getGlobalDirective() const {
|
|
return GlobalDirective;
|
|
}
|
|
const char *getExternDirective() const {
|
|
return ExternDirective;
|
|
}
|
|
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 hasNoDeadStrip() const { return HasNoDeadStrip; }
|
|
bool hasSymbolResolver() const { return HasSymbolResolver; }
|
|
const char *getWeakRefDirective() const { return WeakRefDirective; }
|
|
const char *getWeakDefDirective() const { return WeakDefDirective; }
|
|
const char *getLinkOnceDirective() const { return LinkOnceDirective; }
|
|
|
|
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 doesDwarfUseInlineInfoSection() const {
|
|
return DwarfUsesInlineInfoSection;
|
|
}
|
|
const char *getDwarfSectionOffsetDirective() const {
|
|
return DwarfSectionOffsetDirective;
|
|
}
|
|
bool doesDwarfUseRelocationsAcrossSections() const {
|
|
return DwarfUsesRelocationsAcrossSections;
|
|
}
|
|
bool useDwarfRegNumForCFI() const {
|
|
return DwarfRegNumForCFI;
|
|
}
|
|
|
|
void addInitialFrameState(MCSymbol *label, const MachineLocation &D,
|
|
const MachineLocation &S) {
|
|
InitialFrameState.push_back(MachineMove(label, D, S));
|
|
}
|
|
const std::vector<MachineMove> &getInitialFrameState() const {
|
|
return InitialFrameState;
|
|
}
|
|
};
|
|
}
|
|
|
|
#endif
|