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 
anchor()20 void MCAsmInfoCOFF::anchor() {}
21 
MCAsmInfoCOFF()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 
anchor()55 void MCAsmInfoMicrosoft::anchor() {}
56 
57 MCAsmInfoMicrosoft::MCAsmInfoMicrosoft() = default;
58 
anchor()59 void MCAsmInfoGNUCOFF::anchor() {}
60 
MCAsmInfoGNUCOFF()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 }
70