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This starts merging MCSection and MCSectionData. There are a few issues with the current split between MCSection and MCSectionData. * It optimizes the the not as important case. We want the production of .o files to be really fast, but the split puts the information used for .o emission in a separate data structure. * The ELF/COFF/MachO hierarchy is not represented in MCSectionData, leading to some ad-hoc ways to represent the various flags. * It makes it harder to remember where each item is. The attached patch starts merging the two by moving the alignment from MCSectionData to MCSection. Most of the patch is actually just dropping 'const', since MCSectionData is mutable, but MCSection was not. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237936 91177308-0d34-0410-b5e6-96231b3b80d8
552 lines
21 KiB
C++
552 lines
21 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_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/MCDwarf.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 WinEH {
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enum class EncodingType {
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Invalid, /// Invalid
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Alpha, /// Windows Alpha
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Alpha64, /// Windows AXP64
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ARM, /// Windows NT (Windows on ARM)
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CE, /// Windows CE ARM, PowerPC, SH3, SH4
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Itanium, /// Windows x64, Windows Itanium (IA-64)
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X86, /// Windows x86, uses no CFI, just EH tables
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MIPS = Alpha,
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};
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}
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enum class ExceptionHandling {
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None, /// No exception support
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DwarfCFI, /// DWARF-like instruction based exceptions
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SjLj, /// setjmp/longjmp based exceptions
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ARM, /// ARM EHABI
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WinEH, /// Windows Exception Handling
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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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/// 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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/// Pointer size in bytes. Default is 4.
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unsigned PointerSize;
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/// Size of the stack slot reserved for 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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/// True if target is little endian. Default is true.
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bool IsLittleEndian;
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/// True if target stack grow up. Default is false.
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bool StackGrowsUp;
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/// True if this target has the MachO .subsections_via_symbols directive.
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/// Default is false.
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bool HasSubsectionsViaSymbols;
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/// True if this is a MachO target that supports the macho-specific .zerofill
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/// directive for emitting BSS Symbols. Default is false.
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bool HasMachoZeroFillDirective;
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/// True if this is a MachO target that supports the macho-specific .tbss
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/// directive for emitting thread local BSS Symbols. Default is false.
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bool HasMachoTBSSDirective;
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/// True if the compiler should emit a ".reference .constructors_used" or
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/// ".reference .destructors_used" directive after the static ctor/dtor
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/// list. This directive is only emitted in Static relocation model. Default
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/// is false.
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bool HasStaticCtorDtorReferenceInStaticMode;
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/// This is the maximum possible length of an instruction, which is needed to
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/// compute the size of an inline asm. Defaults to 4.
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unsigned MaxInstLength;
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/// Every possible instruction length is a multiple of this value. Factored
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/// out in .debug_frame and .debug_line. Defaults to 1.
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unsigned MinInstAlignment;
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/// The '$' token, when not referencing an identifier or constant, refers to
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/// the current PC. Defaults to false.
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bool DollarIsPC;
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/// This string, if specified, is used to separate instructions from each
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/// other when on the same line. Defaults to ';'
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const char *SeparatorString;
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/// This indicates the comment character used by the assembler. Defaults to
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/// "#"
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const char *CommentString;
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/// This is appended to emitted labels. Defaults to ":"
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const char *LabelSuffix;
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// Print the EH begin symbol with an assignment. Defaults to false.
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bool UseAssignmentForEHBegin;
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// Do we need to create a local symbol for .size?
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bool NeedsLocalForSize;
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/// This prefix is used for globals like constant pool entries that are
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/// completely private to the .s file and should not have names in the .o
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/// file. Defaults to "L"
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const char *PrivateGlobalPrefix;
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/// This prefix is used for labels for basic blocks. Defaults to the same as
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/// PrivateGlobalPrefix.
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const char *PrivateLabelPrefix;
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/// This prefix is used for symbols that should be passed through the
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/// assembler but be removed by the linker. This is 'l' on Darwin, currently
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/// used for some ObjC metadata. The default of "" meast that for this system
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/// a plain private symbol should be used. Defaults to "".
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const char *LinkerPrivateGlobalPrefix;
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/// If these are nonempty, they contain a directive to emit before and after
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/// an inline assembly statement. Defaults to "#APP\n", "#NO_APP\n"
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const char *InlineAsmStart;
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const char *InlineAsmEnd;
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/// These are assembly directives that tells the assembler to interpret the
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/// following instructions differently. Defaults to ".code16", ".code32",
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/// ".code64".
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const char *Code16Directive;
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const char *Code32Directive;
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const char *Code64Directive;
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/// Which dialect of an assembler variant to use. Defaults to 0
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unsigned AssemblerDialect;
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/// This is true if the assembler allows @ characters in symbol names.
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/// Defaults to false.
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bool AllowAtInName;
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/// This is true if data region markers should be printed as
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/// ".data_region/.end_data_region" directives. If false, use "$d/$a" labels
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/// instead.
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bool UseDataRegionDirectives;
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//===--- Data Emission Directives -------------------------------------===//
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/// This should be set to the directive used to get some number of zero bytes
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/// emitted to the current section. Common cases are "\t.zero\t" and
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/// "\t.space\t". If this is set to null, the Data*bitsDirective's will be
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/// used to emit zero bytes. Defaults to "\t.zero\t"
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const char *ZeroDirective;
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/// This directive allows emission of an ascii string with the standard C
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/// escape characters embedded into it. Defaults to "\t.ascii\t"
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const char *AsciiDirective;
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/// If not null, this allows for special handling of zero terminated strings
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/// on this target. This is commonly supported as ".asciz". If a target
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/// doesn't support this, it can be set to null. Defaults to "\t.asciz\t"
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const char *AscizDirective;
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/// These directives are used to output some unit of integer data to the
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/// current section. If a data directive is set to null, smaller data
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/// directives will be used to emit the large sizes. Defaults to "\t.byte\t",
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/// "\t.short\t", "\t.long\t", "\t.quad\t"
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const char *Data8bitsDirective;
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const char *Data16bitsDirective;
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const char *Data32bitsDirective;
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const char *Data64bitsDirective;
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/// If non-null, a directive that is used to emit a word which should be
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/// relocated as a 64-bit GP-relative offset, e.g. .gpdword on Mips. Defaults
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/// to NULL.
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const char *GPRel64Directive;
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/// If non-null, a directive that is used to emit a word which should be
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/// relocated as a 32-bit GP-relative offset, e.g. .gpword on Mips or .gprel32
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/// on Alpha. Defaults to NULL.
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const char *GPRel32Directive;
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/// This is true if this target uses "Sun Style" syntax for section switching
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/// ("#alloc,#write" etc) instead of the normal ELF syntax (,"a,w") in
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/// .section directives. Defaults to false.
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bool SunStyleELFSectionSwitchSyntax;
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/// This is true if this target uses ELF '.section' directive before the
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/// '.bss' one. It's used for PPC/Linux which doesn't support the '.bss'
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/// directive only. Defaults to false.
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bool UsesELFSectionDirectiveForBSS;
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bool NeedsDwarfSectionOffsetDirective;
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//===--- Alignment Information ----------------------------------------===//
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/// If this is true (the default) then the asmprinter emits ".align N"
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/// directives, where N is the number of bytes to align to. Otherwise, it
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/// emits ".align log2(N)", e.g. 3 to align to an 8 byte boundary. Defaults
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/// to true.
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bool AlignmentIsInBytes;
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/// If non-zero, this is used to fill the executable space created as the
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/// result of a alignment directive. Defaults to 0
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unsigned TextAlignFillValue;
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//===--- Global Variable Emission Directives --------------------------===//
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/// This is the directive used to declare a global entity. Defaults to
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/// ".globl".
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const char *GlobalDirective;
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/// True if the expression
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/// .long f - g
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/// uses a relocation but it can be suppressed by writing
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/// a = f - g
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/// .long a
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bool SetDirectiveSuppressesReloc;
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/// False if the assembler requires that we use
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/// \code
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/// Lc = a - b
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/// .long Lc
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/// \endcode
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//
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/// instead of
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//
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/// \code
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/// .long a - b
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/// \endcode
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///
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/// Defaults to true.
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bool HasAggressiveSymbolFolding;
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/// True is .comm's and .lcomms optional alignment is to be specified in bytes
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/// instead of log2(n). Defaults to true.
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bool COMMDirectiveAlignmentIsInBytes;
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/// Describes if the .lcomm directive for the target supports an alignment
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/// argument and how it is interpreted. Defaults to NoAlignment.
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LCOMM::LCOMMType LCOMMDirectiveAlignmentType;
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// True if the target allows .align directives on functions. This is true for
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// most targets, so defaults to true.
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bool HasFunctionAlignment;
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/// True if the target has .type and .size directives, this is true for most
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/// ELF targets. Defaults to true.
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bool HasDotTypeDotSizeDirective;
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/// True if the target has a single parameter .file directive, this is true
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/// for ELF targets. Defaults to true.
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bool HasSingleParameterDotFile;
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/// True if the target has a .ident directive, this is true for ELF targets.
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/// Defaults to false.
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bool HasIdentDirective;
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/// True if this target supports the MachO .no_dead_strip directive. Defaults
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/// to false.
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bool HasNoDeadStrip;
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/// Used to declare a global as being a weak symbol. Defaults to ".weak".
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const char *WeakDirective;
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/// This directive, if non-null, is used to declare a global as being a weak
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/// undefined symbol. Defaults to NULL.
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const char *WeakRefDirective;
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/// True if we have a directive to declare a global as being a weak defined
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/// symbol. Defaults to false.
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bool HasWeakDefDirective;
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/// True if we have a directive to declare a global as being a weak defined
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/// symbol that can be hidden (unexported). Defaults to false.
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bool HasWeakDefCanBeHiddenDirective;
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/// True if we have a .linkonce directive. This is used on cygwin/mingw.
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/// Defaults to false.
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bool HasLinkOnceDirective;
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/// This attribute, if not MCSA_Invalid, is used to declare a symbol as having
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/// hidden visibility. Defaults to MCSA_Hidden.
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MCSymbolAttr HiddenVisibilityAttr;
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/// This attribute, if not MCSA_Invalid, is used to declare an undefined
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/// symbol as having hidden visibility. Defaults to MCSA_Hidden.
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MCSymbolAttr HiddenDeclarationVisibilityAttr;
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/// This attribute, if not MCSA_Invalid, is used to declare a symbol as having
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/// protected visibility. Defaults to MCSA_Protected
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MCSymbolAttr ProtectedVisibilityAttr;
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//===--- Dwarf Emission Directives -----------------------------------===//
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/// True if target supports emission of debugging information. Defaults to
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/// false.
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bool SupportsDebugInformation;
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/// Exception handling format for the target. Defaults to None.
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ExceptionHandling ExceptionsType;
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/// Windows exception handling data (.pdata) encoding. Defaults to Invalid.
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WinEH::EncodingType WinEHEncodingType;
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/// True if Dwarf2 output generally uses relocations for references to other
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/// .debug_* sections.
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bool DwarfUsesRelocationsAcrossSections;
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/// True if DWARF FDE symbol reference relocations should be replaced by an
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/// absolute difference.
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bool DwarfFDESymbolsUseAbsDiff;
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/// True if dwarf register numbers are printed instead of symbolic register
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/// names in .cfi_* directives. Defaults to false.
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bool DwarfRegNumForCFI;
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/// True if target uses parens to indicate the symbol variant instead of @.
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/// For example, foo(plt) instead of foo@plt. Defaults to false.
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bool UseParensForSymbolVariant;
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//===--- Prologue State ----------------------------------------------===//
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std::vector<MCCFIInstruction> InitialFrameState;
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//===--- Integrated Assembler Information ----------------------------===//
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/// Should we use the integrated assembler?
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/// The integrated assembler should be enabled by default (by the
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/// constructors) when failing to parse a valid piece of assembly (inline
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/// or otherwise) is considered a bug. It may then be overridden after
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/// construction (see LLVMTargetMachine::initAsmInfo()).
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bool UseIntegratedAssembler;
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/// Compress DWARF debug sections. Defaults to false.
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bool CompressDebugSections;
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/// True if the integrated assembler should interpret 'a >> b' constant
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/// expressions as logical rather than arithmetic.
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bool UseLogicalShr;
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public:
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explicit MCAsmInfo();
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virtual ~MCAsmInfo();
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/// Get the pointer size in bytes.
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unsigned getPointerSize() const { return PointerSize; }
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/// 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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/// True if the target is little endian.
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bool isLittleEndian() const { return IsLittleEndian; }
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/// True if target stack grow up.
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bool isStackGrowthDirectionUp() const { return StackGrowsUp; }
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bool hasSubsectionsViaSymbols() const { return HasSubsectionsViaSymbols; }
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// Data directive accessors.
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const char *getData8bitsDirective() const { return Data8bitsDirective; }
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const char *getData16bitsDirective() const { return Data16bitsDirective; }
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const char *getData32bitsDirective() const { return Data32bitsDirective; }
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const char *getData64bitsDirective() const { return Data64bitsDirective; }
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const char *getGPRel64Directive() const { return GPRel64Directive; }
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const char *getGPRel32Directive() const { return GPRel32Directive; }
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/// Targets can implement this method to specify a section to switch to if the
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/// translation unit doesn't have any trampolines that require an executable
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/// stack.
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virtual MCSection *getNonexecutableStackSection(MCContext &Ctx) const {
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return nullptr;
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}
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/// \brief True if the section is atomized using the symbols in it.
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/// This is false if the section is not atomized at all (most ELF sections) or
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/// if it is atomized based on its contents (MachO' __TEXT,__cstring for
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/// example).
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virtual bool isSectionAtomizableBySymbols(const MCSection &Section) const;
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virtual const MCExpr *getExprForPersonalitySymbol(const MCSymbol *Sym,
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unsigned Encoding,
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MCStreamer &Streamer) const;
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virtual const MCExpr *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 needsDwarfSectionOffsetDirective() const {
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return NeedsDwarfSectionOffsetDirective;
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}
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// Accessors.
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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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unsigned getMaxInstLength() const { return MaxInstLength; }
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unsigned getMinInstAlignment() const { return MinInstAlignment; }
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bool getDollarIsPC() const { return DollarIsPC; }
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const char *getSeparatorString() const { return SeparatorString; }
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/// This indicates the column (zero-based) at which asm comments should be
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/// printed.
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unsigned getCommentColumn() const { return 40; }
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const char *getCommentString() const { return CommentString; }
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const char *getLabelSuffix() const { return LabelSuffix; }
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bool useAssignmentForEHBegin() const { return UseAssignmentForEHBegin; }
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bool needsLocalForSize() const { return NeedsLocalForSize; }
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const char *getPrivateGlobalPrefix() const { return PrivateGlobalPrefix; }
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const char *getPrivateLabelPrefix() const { return PrivateLabelPrefix; }
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bool hasLinkerPrivateGlobalPrefix() const {
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return LinkerPrivateGlobalPrefix[0] != '\0';
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}
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const char *getLinkerPrivateGlobalPrefix() const {
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if (hasLinkerPrivateGlobalPrefix())
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return LinkerPrivateGlobalPrefix;
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return getPrivateGlobalPrefix();
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}
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const char *getInlineAsmStart() const { return InlineAsmStart; }
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const char *getInlineAsmEnd() const { return InlineAsmEnd; }
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const char *getCode16Directive() const { return Code16Directive; }
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const char *getCode32Directive() const { return Code32Directive; }
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const char *getCode64Directive() const { return Code64Directive; }
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unsigned getAssemblerDialect() const { return AssemblerDialect; }
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bool doesAllowAtInName() const { return AllowAtInName; }
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bool doesSupportDataRegionDirectives() const {
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return UseDataRegionDirectives;
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}
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const char *getZeroDirective() const { return ZeroDirective; }
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const char *getAsciiDirective() const { return AsciiDirective; }
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const char *getAscizDirective() const { return AscizDirective; }
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bool getAlignmentIsInBytes() const { return AlignmentIsInBytes; }
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unsigned getTextAlignFillValue() const { return TextAlignFillValue; }
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const char *getGlobalDirective() const { return GlobalDirective; }
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bool doesSetDirectiveSuppressesReloc() const {
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return SetDirectiveSuppressesReloc;
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}
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bool hasAggressiveSymbolFolding() const { return HasAggressiveSymbolFolding; }
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bool getCOMMDirectiveAlignmentIsInBytes() const {
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return COMMDirectiveAlignmentIsInBytes;
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}
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LCOMM::LCOMMType getLCOMMDirectiveAlignmentType() const {
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return LCOMMDirectiveAlignmentType;
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}
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bool hasFunctionAlignment() const { return HasFunctionAlignment; }
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bool hasDotTypeDotSizeDirective() const { return HasDotTypeDotSizeDirective; }
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|
bool hasSingleParameterDotFile() const { return HasSingleParameterDotFile; }
|
|
bool hasIdentDirective() const { return HasIdentDirective; }
|
|
bool hasNoDeadStrip() const { return HasNoDeadStrip; }
|
|
const char *getWeakDirective() const { return WeakDirective; }
|
|
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 doesSupportDebugInformation() const { return SupportsDebugInformation; }
|
|
bool doesSupportExceptionHandling() const {
|
|
return ExceptionsType != ExceptionHandling::None;
|
|
}
|
|
ExceptionHandling getExceptionHandlingType() const { return ExceptionsType; }
|
|
WinEH::EncodingType getWinEHEncodingType() const { return WinEHEncodingType; }
|
|
|
|
/// Returns true if the exception handling method for the platform uses call
|
|
/// frame information to unwind.
|
|
bool usesCFIForEH() const {
|
|
return (ExceptionsType == ExceptionHandling::DwarfCFI ||
|
|
ExceptionsType == ExceptionHandling::ARM || usesWindowsCFI());
|
|
}
|
|
|
|
bool usesWindowsCFI() const {
|
|
return ExceptionsType == ExceptionHandling::WinEH &&
|
|
(WinEHEncodingType != WinEH::EncodingType::Invalid &&
|
|
WinEHEncodingType != WinEH::EncodingType::X86);
|
|
}
|
|
|
|
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.
|
|
virtual void setUseIntegratedAssembler(bool Value) {
|
|
UseIntegratedAssembler = Value;
|
|
}
|
|
|
|
bool compressDebugSections() const { return CompressDebugSections; }
|
|
|
|
void setCompressDebugSections(bool CompressDebugSections) {
|
|
this->CompressDebugSections = CompressDebugSections;
|
|
}
|
|
|
|
bool shouldUseLogicalShr() const { return UseLogicalShr; }
|
|
};
|
|
}
|
|
|
|
#endif
|