lib/MC/MCAsmInfoCOFF.cpp

   1 //===- MCAsmInfoCOFF.cpp - COFF asm properties ----------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file defines target asm properties related what form asm statements
  11 // should take in general on COFF-based targets
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm/MC/MCAsmInfoCOFF.h"
  16 #include "llvm/MC/MCDirectives.h"
  17
  18 using namespace llvm;
  19
  20 void MCAsmInfoCOFF::anchor() {}
  21
  22 MCAsmInfoCOFF::MCAsmInfoCOFF() {
  23   // MingW 4.5 and later support .comm with log2 alignment, but .lcomm uses byte
  24   // alignment.
  25   COMMDirectiveAlignmentIsInBytes = false;
  26   LCOMMDirectiveAlignmentType = LCOMM::ByteAlignment;
  27   HasDotTypeDotSizeDirective = false;
  28   HasSingleParameterDotFile = true;
  29   WeakRefDirective = "\t.weak\t";
  30   HasLinkOnceDirective = true;
  31
  32   // Doesn't support visibility:
  33   HiddenVisibilityAttr = HiddenDeclarationVisibilityAttr = MCSA_Invalid;
  34   ProtectedVisibilityAttr = MCSA_Invalid;
  35
  36   // Set up DWARF directives
  37   SupportsDebugInformation = true;
  38   NeedsDwarfSectionOffsetDirective = true;
  39
  40   UseIntegratedAssembler = true;
  41
  42   // At least MSVC inline-asm does AShr.
  43   UseLogicalShr = false;
  44
  45   // If this is a COFF target, assume that it supports associative comdats. It's
  46   // part of the spec.
  47   HasCOFFAssociativeComdats = true;
  48
  49   // We can generate constants in comdat sections that can be shared,
  50   // but in order not to create null typed symbols, we actually need to
  51   // make them global symbols as well.
  52   HasCOFFComdatConstants = true;
  53 }
  54
  55 void MCAsmInfoMicrosoft::anchor() {}
  56
  57 MCAsmInfoMicrosoft::MCAsmInfoMicrosoft() = default;
  58
  59 void MCAsmInfoGNUCOFF::anchor() {}
  60
  61 MCAsmInfoGNUCOFF::MCAsmInfoGNUCOFF() {
  62   // If this is a GNU environment (mingw or cygwin), don't use associative
  63   // comdats for jump tables, unwind information, and other data associated with
  64   // a function.
  65   HasCOFFAssociativeComdats = false;
  66
  67   // We don't create constants in comdat sections for MinGW.
  68   HasCOFFComdatConstants = false;
  69 }