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Bruno Cardoso Lopes607cd3b2009-08-13 05:07:35 +00001//===- lib/MC/MCSectionELF.cpp - ELF Code Section Representation ----------===//
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#include "llvm/MC/MCSectionELF.h"
Chris Lattner7b26fce2009-08-22 20:48:53 +000011#include "llvm/MC/MCAsmInfo.h"
Chris Lattnerb9d1f5a2010-01-13 21:21:29 +000012#include "llvm/MC/MCContext.h"
Peter Collingbourne2f495b92013-04-17 21:18:16 +000013#include "llvm/MC/MCExpr.h"
Chris Lattnerb9d1f5a2010-01-13 21:21:29 +000014#include "llvm/MC/MCSymbol.h"
Rafael Espindolaaea49582011-01-23 04:28:49 +000015#include "llvm/Support/ELF.h"
Chris Lattnerb9d1f5a2010-01-13 21:21:29 +000016#include "llvm/Support/raw_ostream.h"
Rafael Espindolaaea49582011-01-23 04:28:49 +000017
Bruno Cardoso Lopes607cd3b2009-08-13 05:07:35 +000018using namespace llvm;
19
Chris Lattner5418dd52010-04-08 21:26:26 +000020MCSectionELF::~MCSectionELF() {} // anchor.
Bruno Cardoso Lopes607cd3b2009-08-13 05:07:35 +000021
Sanjay Patel352fb462014-10-09 21:23:39 +000022// Decides whether a '.section' directive
23// should be printed before the section name.
Benjamin Kramer94b993e2010-01-22 18:21:23 +000024bool MCSectionELF::ShouldOmitSectionDirective(StringRef Name,
Chris Lattnerb9d1f5a2010-01-13 21:21:29 +000025 const MCAsmInfo &MAI) const {
Jim Grosbachdc1e36e2012-05-11 01:41:30 +000026
Rafael Espindola68fa2492015-02-17 20:48:01 +000027 if (Unique)
28 return false;
29
Bruno Cardoso Lopes607cd3b2009-08-13 05:07:35 +000030 // FIXME: Does .section .bss/.data/.text work everywhere??
Benjamin Kramer94b993e2010-01-22 18:21:23 +000031 if (Name == ".text" || Name == ".data" ||
32 (Name == ".bss" && !MAI.usesELFSectionDirectiveForBSS()))
Bruno Cardoso Lopes607cd3b2009-08-13 05:07:35 +000033 return true;
34
35 return false;
36}
37
Rafael Espindolafdc88132013-11-13 14:01:59 +000038static void printName(raw_ostream &OS, StringRef Name) {
39 if (Name.find_first_not_of("0123456789_."
40 "abcdefghijklmnopqrstuvwxyz"
41 "ABCDEFGHIJKLMNOPQRSTUVWXYZ") == Name.npos) {
42 OS << Name;
43 return;
44 }
45 OS << '"';
46 for (const char *B = Name.begin(), *E = Name.end(); B < E; ++B) {
47 if (*B == '"') // Unquoted "
48 OS << "\\\"";
49 else if (*B != '\\') // Neither " or backslash
50 OS << *B;
51 else if (B + 1 == E) // Trailing backslash
52 OS << "\\\\";
53 else {
54 OS << B[0] << B[1]; // Quoted character
55 ++B;
56 }
57 }
58 OS << '"';
59}
60
Chris Lattnere9a75a62009-08-22 21:43:10 +000061void MCSectionELF::PrintSwitchToSection(const MCAsmInfo &MAI,
Peter Collingbourne2f495b92013-04-17 21:18:16 +000062 raw_ostream &OS,
63 const MCExpr *Subsection) const {
Jim Grosbachdc1e36e2012-05-11 01:41:30 +000064
Benjamin Kramer94b993e2010-01-22 18:21:23 +000065 if (ShouldOmitSectionDirective(SectionName, MAI)) {
Peter Collingbourne2f495b92013-04-17 21:18:16 +000066 OS << '\t' << getSectionName();
67 if (Subsection)
68 OS << '\t' << *Subsection;
69 OS << '\n';
Bruno Cardoso Lopes607cd3b2009-08-13 05:07:35 +000070 return;
71 }
72
Rafael Espindolafdc88132013-11-13 14:01:59 +000073 OS << "\t.section\t";
74 printName(OS, getSectionName());
Joerg Sonnenberger852ab892011-03-03 22:31:08 +000075
Bruno Cardoso Lopes607cd3b2009-08-13 05:07:35 +000076 // Handle the weird solaris syntax if desired.
Jim Grosbachdc1e36e2012-05-11 01:41:30 +000077 if (MAI.usesSunStyleELFSectionSwitchSyntax() &&
Rafael Espindola0e7e34e2011-01-23 04:43:11 +000078 !(Flags & ELF::SHF_MERGE)) {
79 if (Flags & ELF::SHF_ALLOC)
Bruno Cardoso Lopes607cd3b2009-08-13 05:07:35 +000080 OS << ",#alloc";
Rafael Espindola0e7e34e2011-01-23 04:43:11 +000081 if (Flags & ELF::SHF_EXECINSTR)
Bruno Cardoso Lopes607cd3b2009-08-13 05:07:35 +000082 OS << ",#execinstr";
Rafael Espindola0e7e34e2011-01-23 04:43:11 +000083 if (Flags & ELF::SHF_WRITE)
Bruno Cardoso Lopes607cd3b2009-08-13 05:07:35 +000084 OS << ",#write";
Benjamin Kramerac511ca2013-09-15 19:53:20 +000085 if (Flags & ELF::SHF_EXCLUDE)
86 OS << ",#exclude";
Rafael Espindola0e7e34e2011-01-23 04:43:11 +000087 if (Flags & ELF::SHF_TLS)
Bruno Cardoso Lopes607cd3b2009-08-13 05:07:35 +000088 OS << ",#tls";
Chris Lattner5418dd52010-04-08 21:26:26 +000089 OS << '\n';
90 return;
91 }
Jim Grosbachdc1e36e2012-05-11 01:41:30 +000092
Chris Lattner5418dd52010-04-08 21:26:26 +000093 OS << ",\"";
Rafael Espindola0e7e34e2011-01-23 04:43:11 +000094 if (Flags & ELF::SHF_ALLOC)
Chris Lattner5418dd52010-04-08 21:26:26 +000095 OS << 'a';
Benjamin Kramerac511ca2013-09-15 19:53:20 +000096 if (Flags & ELF::SHF_EXCLUDE)
97 OS << 'e';
Rafael Espindola0e7e34e2011-01-23 04:43:11 +000098 if (Flags & ELF::SHF_EXECINSTR)
Chris Lattner5418dd52010-04-08 21:26:26 +000099 OS << 'x';
Rafael Espindola70d80152011-02-14 22:23:49 +0000100 if (Flags & ELF::SHF_GROUP)
101 OS << 'G';
Rafael Espindola0e7e34e2011-01-23 04:43:11 +0000102 if (Flags & ELF::SHF_WRITE)
Chris Lattner5418dd52010-04-08 21:26:26 +0000103 OS << 'w';
Rafael Espindola0e7e34e2011-01-23 04:43:11 +0000104 if (Flags & ELF::SHF_MERGE)
Chris Lattner5418dd52010-04-08 21:26:26 +0000105 OS << 'M';
Rafael Espindola0e7e34e2011-01-23 04:43:11 +0000106 if (Flags & ELF::SHF_STRINGS)
Chris Lattner5418dd52010-04-08 21:26:26 +0000107 OS << 'S';
Rafael Espindola0e7e34e2011-01-23 04:43:11 +0000108 if (Flags & ELF::SHF_TLS)
Chris Lattner5418dd52010-04-08 21:26:26 +0000109 OS << 'T';
Jim Grosbachdc1e36e2012-05-11 01:41:30 +0000110
Chris Lattner5418dd52010-04-08 21:26:26 +0000111 // If there are target-specific flags, print them.
Rafael Espindola0e7e34e2011-01-23 04:43:11 +0000112 if (Flags & ELF::XCORE_SHF_CP_SECTION)
Chris Lattner5418dd52010-04-08 21:26:26 +0000113 OS << 'c';
Rafael Espindola0e7e34e2011-01-23 04:43:11 +0000114 if (Flags & ELF::XCORE_SHF_DP_SECTION)
Chris Lattner5418dd52010-04-08 21:26:26 +0000115 OS << 'd';
Jim Grosbachdc1e36e2012-05-11 01:41:30 +0000116
Chris Lattner5418dd52010-04-08 21:26:26 +0000117 OS << '"';
Bruno Cardoso Lopes607cd3b2009-08-13 05:07:35 +0000118
Rafael Espindola9bb44a52010-11-09 23:42:07 +0000119 OS << ',';
120
121 // If comment string is '@', e.g. as on ARM - use '%' instead
122 if (MAI.getCommentString()[0] == '@')
123 OS << '%';
124 else
125 OS << '@';
126
Rafael Espindolaaea49582011-01-23 04:28:49 +0000127 if (Type == ELF::SHT_INIT_ARRAY)
Rafael Espindola9bb44a52010-11-09 23:42:07 +0000128 OS << "init_array";
Rafael Espindolaaea49582011-01-23 04:28:49 +0000129 else if (Type == ELF::SHT_FINI_ARRAY)
Rafael Espindola9bb44a52010-11-09 23:42:07 +0000130 OS << "fini_array";
Rafael Espindolaaea49582011-01-23 04:28:49 +0000131 else if (Type == ELF::SHT_PREINIT_ARRAY)
Rafael Espindola9bb44a52010-11-09 23:42:07 +0000132 OS << "preinit_array";
Rafael Espindolaaea49582011-01-23 04:28:49 +0000133 else if (Type == ELF::SHT_NOBITS)
Rafael Espindola9bb44a52010-11-09 23:42:07 +0000134 OS << "nobits";
Rafael Espindolaaea49582011-01-23 04:28:49 +0000135 else if (Type == ELF::SHT_NOTE)
Rafael Espindola9ae2d052010-12-26 21:30:59 +0000136 OS << "note";
Rafael Espindolaaea49582011-01-23 04:28:49 +0000137 else if (Type == ELF::SHT_PROGBITS)
Rafael Espindola9bb44a52010-11-09 23:42:07 +0000138 OS << "progbits";
139
140 if (EntrySize) {
Rafael Espindola0e7e34e2011-01-23 04:43:11 +0000141 assert(Flags & ELF::SHF_MERGE);
Rafael Espindola9bb44a52010-11-09 23:42:07 +0000142 OS << "," << EntrySize;
Bruno Cardoso Lopes607cd3b2009-08-13 05:07:35 +0000143 }
Rafael Espindola9bb44a52010-11-09 23:42:07 +0000144
Rafael Espindolafdc88132013-11-13 14:01:59 +0000145 if (Flags & ELF::SHF_GROUP) {
146 OS << ",";
147 printName(OS, Group->getName());
148 OS << ",comdat";
149 }
Rafael Espindola68fa2492015-02-17 20:48:01 +0000150
151 if (Unique)
152 OS << ",unique";
153
Bruno Cardoso Lopes607cd3b2009-08-13 05:07:35 +0000154 OS << '\n';
Peter Collingbourne2f495b92013-04-17 21:18:16 +0000155
156 if (Subsection)
157 OS << "\t.subsection\t" << *Subsection << '\n';
Bruno Cardoso Lopes607cd3b2009-08-13 05:07:35 +0000158}
159
Jan Wen Voung87f77b52010-10-04 17:32:41 +0000160bool MCSectionELF::UseCodeAlign() const {
Rafael Espindola0e7e34e2011-01-23 04:43:11 +0000161 return getFlags() & ELF::SHF_EXECINSTR;
Jan Wen Voung87f77b52010-10-04 17:32:41 +0000162}
163
Rafael Espindola7a2cd8b2010-11-17 20:03:54 +0000164bool MCSectionELF::isVirtualSection() const {
Rafael Espindolaaea49582011-01-23 04:28:49 +0000165 return getType() == ELF::SHT_NOBITS;
Rafael Espindola7a2cd8b2010-11-17 20:03:54 +0000166}