1 //===- lib/MC/MCSectionELF.cpp - ELF Code Section Representation ----------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/MC/MCSectionELF.h"
11 #include "llvm/MC/MCAsmInfo.h"
12 #include "llvm/MC/MCContext.h"
13 #include "llvm/MC/MCSymbol.h"
14 #include "llvm/Support/raw_ostream.h"
17 MCSectionELF::~MCSectionELF() {} // anchor.
19 // ShouldOmitSectionDirective - Decides whether a '.section' directive
20 // should be printed before the section name
21 bool MCSectionELF::ShouldOmitSectionDirective(StringRef Name,
22 const MCAsmInfo &MAI) const {
24 // FIXME: Does .section .bss/.data/.text work everywhere??
25 if (Name == ".text" || Name == ".data" ||
26 (Name == ".bss" && !MAI.usesELFSectionDirectiveForBSS()))
32 // ShouldPrintSectionType - Only prints the section type if supported
33 bool MCSectionELF::ShouldPrintSectionType(unsigned Ty) const {
34 if (IsExplicit && !(Ty == SHT_NOBITS || Ty == SHT_PROGBITS))
40 void MCSectionELF::PrintSwitchToSection(const MCAsmInfo &MAI,
41 raw_ostream &OS) const {
43 if (ShouldOmitSectionDirective(SectionName, MAI)) {
44 OS << '\t' << getSectionName() << '\n';
48 OS << "\t.section\t" << getSectionName();
50 // Handle the weird solaris syntax if desired.
51 if (MAI.usesSunStyleELFSectionSwitchSyntax() &&
52 !(Flags & MCSectionELF::SHF_MERGE)) {
53 if (Flags & MCSectionELF::SHF_ALLOC)
55 if (Flags & MCSectionELF::SHF_EXECINSTR)
57 if (Flags & MCSectionELF::SHF_WRITE)
59 if (Flags & MCSectionELF::SHF_TLS)
66 if (Flags & MCSectionELF::SHF_ALLOC)
68 if (Flags & MCSectionELF::SHF_EXECINSTR)
70 if (Flags & MCSectionELF::SHF_WRITE)
72 if (Flags & MCSectionELF::SHF_MERGE)
74 if (Flags & MCSectionELF::SHF_STRINGS)
76 if (Flags & MCSectionELF::SHF_TLS)
79 // If there are target-specific flags, print them.
80 if (Flags & MCSectionELF::XCORE_SHF_CP_SECTION)
82 if (Flags & MCSectionELF::XCORE_SHF_DP_SECTION)
87 if (ShouldPrintSectionType(Type)) {
90 // If comment string is '@', e.g. as on ARM - use '%' instead
91 if (MAI.getCommentString()[0] == '@')
96 if (Type == MCSectionELF::SHT_INIT_ARRAY)
98 else if (Type == MCSectionELF::SHT_FINI_ARRAY)
100 else if (Type == MCSectionELF::SHT_PREINIT_ARRAY)
101 OS << "preinit_array";
102 else if (Type == MCSectionELF::SHT_NOBITS)
104 else if (Type == MCSectionELF::SHT_PROGBITS)
108 OS << "," << EntrySize;
115 bool MCSectionELF::UseCodeAlign() const {
116 return getFlags() & MCSectionELF::SHF_EXECINSTR;
119 // HasCommonSymbols - True if this section holds common symbols, this is
120 // indicated on the ELF object file by a symbol with SHN_COMMON section
122 bool MCSectionELF::HasCommonSymbols() const {
124 if (StringRef(SectionName).startswith(".gnu.linkonce."))
130 unsigned MCSectionELF::DetermineEntrySize(SectionKind Kind) {
131 if (Kind.isMergeable1ByteCString()) return 1;
132 if (Kind.isMergeable2ByteCString()) return 2;
133 if (Kind.isMergeable4ByteCString()) return 4;
134 if (Kind.isMergeableConst4()) return 4;
135 if (Kind.isMergeableConst8()) return 8;
136 if (Kind.isMergeableConst16()) return 16;