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   HasLinkOnceDirective = 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   UseIntegratedAssembler = true;
40 
41   // At least MSVC inline-asm does AShr.
42   UseLogicalShr = false;
43 
44   // If this is a COFF target, assume that it supports associative comdats. It's
45   // part of the spec.
46   HasCOFFAssociativeComdats = true;
47 
48   // We can generate constants in comdat sections that can be shared,
49   // but in order not to create null typed symbols, we actually need to
50   // make them global symbols as well.
51   HasCOFFComdatConstants = true;
52 }
53 
54 void MCAsmInfoMicrosoft::anchor() {}
55 
56 MCAsmInfoMicrosoft::MCAsmInfoMicrosoft() = default;
57 
58 void MCAsmInfoGNUCOFF::anchor() {}
59 
60 MCAsmInfoGNUCOFF::MCAsmInfoGNUCOFF() {
61   // If this is a GNU environment (mingw or cygwin), don't use associative
62   // comdats for jump tables, unwind information, and other data associated with
63   // a function.
64   HasCOFFAssociativeComdats = false;
65 
66   // We don't create constants in comdat sections for MinGW.
67   HasCOFFComdatConstants = false;
68 }
69