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1 //===- MCAsmInfoCOFF.cpp - COFF asm properties ----------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file defines target asm properties related what form asm statements
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10 // should take in general on COFF-based targets
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "llvm/MC/MCAsmInfoCOFF.h"
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15 #include "llvm/MC/MCDirectives.h"
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16
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17 using namespace llvm;
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18
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19 void MCAsmInfoCOFF::anchor() {}
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20
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21 MCAsmInfoCOFF::MCAsmInfoCOFF() {
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22 // MingW 4.5 and later support .comm with log2 alignment, but .lcomm uses byte
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23 // alignment.
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24 COMMDirectiveAlignmentIsInBytes = false;
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25 LCOMMDirectiveAlignmentType = LCOMM::ByteAlignment;
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26 HasDotTypeDotSizeDirective = false;
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27 HasSingleParameterDotFile = true;
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28 WeakRefDirective = "\t.weak\t";
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29 AvoidWeakIfComdat = true;
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30
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31 // Doesn't support visibility:
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32 HiddenVisibilityAttr = HiddenDeclarationVisibilityAttr = MCSA_Invalid;
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33 ProtectedVisibilityAttr = MCSA_Invalid;
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34
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35 // Set up DWARF directives
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36 SupportsDebugInformation = true;
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37 NeedsDwarfSectionOffsetDirective = true;
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38
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39 // At least MSVC inline-asm does AShr.
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40 UseLogicalShr = false;
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41
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42 // If this is a COFF target, assume that it supports associative comdats. It's
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43 // part of the spec.
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44 HasCOFFAssociativeComdats = true;
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45
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46 // We can generate constants in comdat sections that can be shared,
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47 // but in order not to create null typed symbols, we actually need to
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48 // make them global symbols as well.
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49 HasCOFFComdatConstants = true;
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50 }
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51
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52 void MCAsmInfoMicrosoft::anchor() {}
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53
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54 MCAsmInfoMicrosoft::MCAsmInfoMicrosoft() = default;
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55
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56 void MCAsmInfoGNUCOFF::anchor() {}
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57
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58 MCAsmInfoGNUCOFF::MCAsmInfoGNUCOFF() {
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59 // If this is a GNU environment (mingw or cygwin), don't use associative
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60 // comdats for jump tables, unwind information, and other data associated with
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61 // a function.
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62 HasCOFFAssociativeComdats = false;
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63
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64 // We don't create constants in comdat sections for MinGW.
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65 HasCOFFComdatConstants = false;
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66 }
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