llvm/lib/MC/MCAsmInfoCOFF.cpp

   1 //===- MCAsmInfoCOFF.cpp - COFF 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 COFF-based targets
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/MC/MCAsmInfoCOFF.h"
  15 #include "llvm/MC/MCDirectives.h"
  16
  17 using namespace llvm;
  18
  19 void MCAsmInfoCOFF::anchor() {}
  20
  21 MCAsmInfoCOFF::MCAsmInfoCOFF() {
  22   // MingW 4.5 and later support .comm with log2 alignment, but .lcomm uses byte
  23   // alignment.
  24   COMMDirectiveAlignmentIsInBytes = false;
  25   LCOMMDirectiveAlignmentType = LCOMM::ByteAlignment;
  26   HasDotTypeDotSizeDirective = false;
  27   HasSingleParameterDotFile = true;
  28   WeakRefDirective = "\t.weak\t";
  29   AvoidWeakIfComdat = true;
  30
  31   // Doesn't support visibility:
  32   HiddenVisibilityAttr = HiddenDeclarationVisibilityAttr = MCSA_Invalid;
  33   ProtectedVisibilityAttr = MCSA_Invalid;
  34
  35   // Set up DWARF directives
  36   SupportsDebugInformation = true;
  37   NeedsDwarfSectionOffsetDirective = true;
  38
  39   // At least MSVC inline-asm does AShr.
  40   UseLogicalShr = false;
  41
  42   // If this is a COFF target, assume that it supports associative comdats. It's
  43   // part of the spec.
  44   HasCOFFAssociativeComdats = true;
  45
  46   // We can generate constants in comdat sections that can be shared,
  47   // but in order not to create null typed symbols, we actually need to
  48   // make them global symbols as well.
  49   HasCOFFComdatConstants = true;
  50 }
  51
  52 void MCAsmInfoMicrosoft::anchor() {}
  53
  54 MCAsmInfoMicrosoft::MCAsmInfoMicrosoft() = default;
  55
  56 void MCAsmInfoGNUCOFF::anchor() {}
  57
  58 MCAsmInfoGNUCOFF::MCAsmInfoGNUCOFF() {
  59   // If this is a GNU environment (mingw or cygwin), don't use associative
  60   // comdats for jump tables, unwind information, and other data associated with
  61   // a function.
  62   HasCOFFAssociativeComdats = false;
  63
  64   // We don't create constants in comdat sections for MinGW.
  65   HasCOFFComdatConstants = false;
  66 }