LLVM 17.0.0git
MCAsmInfoDarwin.cpp
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1//===- MCAsmInfoDarwin.cpp - Darwin asm properties ------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file defines target asm properties related what form asm statements
10// should take in general on Darwin-based targets
11//
12//===----------------------------------------------------------------------===//
13
18
19using namespace llvm;
20
22 const MCSection &Section) const {
23 const MCSectionMachO &SMO = static_cast<const MCSectionMachO &>(Section);
24
25 // Sections holding 1 byte strings are atomized based on the data they
26 // contain.
27 // Sections holding 2 byte strings require symbols in order to be atomized.
28 // There is no dedicated section for 4 byte strings.
30 return false;
31
32 if (SMO.getSegmentName() == "__DATA" && SMO.getName() == "__cfstring")
33 return false;
34
35 if (SMO.getSegmentName() == "__DATA" && SMO.getName() == "__objc_classrefs")
36 return false;
37
38 switch (SMO.getType()) {
39 default:
40 return true;
41
42 // These sections are atomized at the element boundaries without using
43 // symbols.
54 return false;
55 }
56}
57
59 // Common settings for all Darwin targets.
60 // Syntax:
64
65 AlignmentIsInBytes = false;
68 InlineAsmStart = " InlineAsm Start";
69 InlineAsmEnd = " InlineAsm End";
70
71 // Directives:
74 WeakRefDirective = "\t.weak_reference ";
75 ZeroDirective = "\t.space\t"; // ".space N" emits N zeros.
76 HasMachoZeroFillDirective = true; // Uses .zerofill
77 HasMachoTBSSDirective = true; // Uses .tbss
78
79 // FIXME: Change this once MC is the system assembler.
81
84
85 // Doesn't support protected visibility.
87
89 HasNoDeadStrip = true;
90 HasAltEntry = true;
91
94}
bool isSectionAtomizableBySymbols(const MCSection &Section) const override
True if the section is atomized using the symbols in it.
bool HasAltEntry
True if this target supports the MachO .alt_entry directive.
Definition: MCAsmInfo.h:407
bool HasNoDeadStrip
True if this target supports the MachO .no_dead_strip directive.
Definition: MCAsmInfo.h:403
MCSymbolAttr ProtectedVisibilityAttr
This attribute, if not MCSA_Invalid, is used to declare a symbol as having protected visibility.
Definition: MCAsmInfo.h:443
bool HasSubsectionsViaSymbols
True if this target has the MachO .subsections_via_symbols directive.
Definition: MCAsmInfo.h:86
bool SetDirectiveSuppressesReloc
True if the expression .long f - g uses a relocation but it can be suppressed by writing a = f - g ....
Definition: MCAsmInfo.h:346
LCOMM::LCOMMType LCOMMDirectiveAlignmentType
Describes if the .lcomm directive for the target supports an alignment argument and how it is interpr...
Definition: MCAsmInfo.h:369
const char * WeakRefDirective
This directive, if non-null, is used to declare a global as being a weak undefined symbol.
Definition: MCAsmInfo.h:414
bool HasDotTypeDotSizeDirective
True if the target has .type and .size directives, this is true for most ELF targets.
Definition: MCAsmInfo.h:387
bool HasWeakDefCanBeHiddenDirective
True if we have a directive to declare a global as being a weak defined symbol that can be hidden (un...
Definition: MCAsmInfo.h:422
const char * InlineAsmStart
If these are nonempty, they contain a directive to emit before and after an inline assembly statement...
Definition: MCAsmInfo.h:182
bool HasWeakDefDirective
True if we have a directive to declare a global as being a weak defined symbol.
Definition: MCAsmInfo.h:418
StringRef LinkerPrivateGlobalPrefix
This prefix is used for symbols that should be passed through the assembler but be removed by the lin...
Definition: MCAsmInfo.h:178
bool HasMachoTBSSDirective
True if this is a MachO target that supports the macho-specific .tbss directive for emitting thread l...
Definition: MCAsmInfo.h:94
const char * InlineAsmEnd
Definition: MCAsmInfo.h:183
MCSymbolAttr HiddenDeclarationVisibilityAttr
This attribute, if not MCSA_Invalid, is used to declare an undefined symbol as having hidden visibili...
Definition: MCAsmInfo.h:439
bool DwarfUsesRelocationsAcrossSections
True if Dwarf2 output generally uses relocations for references to other .debug_* sections.
Definition: MCAsmInfo.h:465
bool HasSingleParameterDotFile
True if the target has a single parameter .file directive, this is true for ELF targets.
Definition: MCAsmInfo.h:391
bool COMMDirectiveAlignmentIsInBytes
True is .comm's and .lcomms optional alignment is to be specified in bytes instead of log2(n).
Definition: MCAsmInfo.h:365
bool AlignmentIsInBytes
If this is true (the default) then the asmprinter emits ".align N" directives, where N is the number ...
Definition: MCAsmInfo.h:329
const char * ZeroDirective
This should be set to the directive used to get some number of zero (and non-zero if supported by the...
Definition: MCAsmInfo.h:249
bool HasAggressiveSymbolFolding
False if the assembler requires that we use.
Definition: MCAsmInfo.h:361
bool HasMachoZeroFillDirective
True if this is a MachO target that supports the macho-specific .zerofill directive for emitting BSS ...
Definition: MCAsmInfo.h:90
MCSymbolAttr HiddenVisibilityAttr
This attribute, if not MCSA_Invalid, is used to declare a symbol as having hidden visibility.
Definition: MCAsmInfo.h:431
This represents a section on a Mach-O system (used by Mac OS X).
MachO::SectionType getType() const
StringRef getSegmentName() const
Instances of this class represent a uniqued identifier for a section in the current translation unit.
Definition: MCSection.h:39
StringRef getName() const
Definition: MCSection.h:124
@ Log2Alignment
Definition: MCAsmInfo.h:50
@ S_THREAD_LOCAL_VARIABLE_POINTERS
S_THREAD_LOCAL_VARIABLE_POINTERS - Section with pointers to thread local structures.
Definition: MachO.h:175
@ S_INTERPOSING
S_INTERPOSING - Section with only pairs of function pointers for interposing.
Definition: MachO.h:158
@ S_16BYTE_LITERALS
S_16BYTE_LITERALS - Section with only 16 byte literals.
Definition: MachO.h:160
@ S_LAZY_SYMBOL_POINTERS
S_LAZY_SYMBOL_POINTERS - Section with lazy symbol pointers.
Definition: MachO.h:141
@ S_MOD_TERM_FUNC_POINTERS
S_MOD_TERM_FUNC_POINTERS - Section with only function pointers for termination.
Definition: MachO.h:150
@ S_MOD_INIT_FUNC_POINTERS
S_MOD_INIT_FUNC_POINTERS - Section with only function pointers for initialization.
Definition: MachO.h:147
@ S_CSTRING_LITERALS
S_CSTRING_LITERALS - Section with literal C strings.
Definition: MachO.h:131
@ S_NON_LAZY_SYMBOL_POINTERS
S_NON_LAZY_SYMBOL_POINTERS - Section with non-lazy symbol pointers.
Definition: MachO.h:139
@ S_4BYTE_LITERALS
S_4BYTE_LITERALS - Section with 4 byte literals.
Definition: MachO.h:133
@ S_LITERAL_POINTERS
S_LITERAL_POINTERS - Section with pointers to literals.
Definition: MachO.h:137
@ S_8BYTE_LITERALS
S_8BYTE_LITERALS - Section with 8 byte literals.
Definition: MachO.h:135
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
@ MCSA_PrivateExtern
.private_extern (MachO)
Definition: MCDirectives.h:42
@ MCSA_Invalid
Not a valid directive.
Definition: MCDirectives.h:19