| //===- MCAsmInfoDarwin.cpp - Darwin asm properties ------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file defines target asm properties related what form asm statements |
| // should take in general on Darwin-based targets |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/MC/MCAsmInfoDarwin.h" |
| #include "llvm/BinaryFormat/MachO.h" |
| #include "llvm/MC/MCDirectives.h" |
| #include "llvm/MC/MCSectionMachO.h" |
| |
| using namespace llvm; |
| |
| bool MCAsmInfoDarwin::isSectionAtomizableBySymbols( |
| const MCSection &Section) const { |
| const MCSectionMachO &SMO = static_cast<const MCSectionMachO &>(Section); |
| |
| // Sections holding 1 byte strings are atomized based on the data they |
| // contain. |
| // Sections holding 2 byte strings require symbols in order to be atomized. |
| // There is no dedicated section for 4 byte strings. |
| if (SMO.getType() == MachO::S_CSTRING_LITERALS) |
| return false; |
| |
| if (SMO.getSegmentName() == "__DATA" && SMO.getName() == "__cfstring") |
| return false; |
| |
| if (SMO.getSegmentName() == "__DATA" && SMO.getName() == "__objc_classrefs") |
| return false; |
| |
| switch (SMO.getType()) { |
| default: |
| return true; |
| |
| // These sections are atomized at the element boundaries without using |
| // symbols. |
| case MachO::S_4BYTE_LITERALS: |
| case MachO::S_8BYTE_LITERALS: |
| case MachO::S_16BYTE_LITERALS: |
| case MachO::S_LITERAL_POINTERS: |
| case MachO::S_NON_LAZY_SYMBOL_POINTERS: |
| case MachO::S_LAZY_SYMBOL_POINTERS: |
| case MachO::S_THREAD_LOCAL_VARIABLE_POINTERS: |
| case MachO::S_MOD_INIT_FUNC_POINTERS: |
| case MachO::S_MOD_TERM_FUNC_POINTERS: |
| case MachO::S_INTERPOSING: |
| return false; |
| } |
| } |
| |
| MCAsmInfoDarwin::MCAsmInfoDarwin() { |
| // Common settings for all Darwin targets. |
| // Syntax: |
| LinkerPrivateGlobalPrefix = "l"; |
| HasSingleParameterDotFile = false; |
| HasSubsectionsViaSymbols = true; |
| |
| AlignmentIsInBytes = false; |
| COMMDirectiveAlignmentIsInBytes = false; |
| LCOMMDirectiveAlignmentType = LCOMM::Log2Alignment; |
| InlineAsmStart = " InlineAsm Start"; |
| InlineAsmEnd = " InlineAsm End"; |
| |
| // Directives: |
| HasWeakDefDirective = true; |
| HasWeakDefCanBeHiddenDirective = true; |
| WeakRefDirective = "\t.weak_reference "; |
| ZeroDirective = "\t.space\t"; // ".space N" emits N zeros. |
| HasMachoZeroFillDirective = true; // Uses .zerofill |
| HasMachoTBSSDirective = true; // Uses .tbss |
| |
| // FIXME: Change this once MC is the system assembler. |
| HasAggressiveSymbolFolding = false; |
| |
| HiddenVisibilityAttr = MCSA_PrivateExtern; |
| HiddenDeclarationVisibilityAttr = MCSA_Invalid; |
| |
| // Doesn't support protected visibility. |
| ProtectedVisibilityAttr = MCSA_Invalid; |
| |
| HasDotTypeDotSizeDirective = false; |
| HasNoDeadStrip = true; |
| HasAltEntry = true; |
| |
| DwarfUsesRelocationsAcrossSections = false; |
| SetDirectiveSuppressesReloc = true; |
| } |