1198090Srdivacky//===- lib/MC/MCSectionELF.cpp - ELF Code Section Representation ----------===// 2198090Srdivacky// 3198090Srdivacky// The LLVM Compiler Infrastructure 4198090Srdivacky// 5198090Srdivacky// This file is distributed under the University of Illinois Open Source 6198090Srdivacky// License. See LICENSE.TXT for details. 7198090Srdivacky// 8198090Srdivacky//===----------------------------------------------------------------------===// 9198090Srdivacky 10198090Srdivacky#include "llvm/MC/MCSectionELF.h" 11202375Srdivacky#include "llvm/MC/MCAsmInfo.h" 12198090Srdivacky#include "llvm/MC/MCContext.h" 13251662Sdim#include "llvm/MC/MCExpr.h" 14202375Srdivacky#include "llvm/MC/MCSymbol.h" 15218893Sdim#include "llvm/Support/ELF.h" 16198090Srdivacky#include "llvm/Support/raw_ostream.h" 17218893Sdim 18198090Srdivackyusing namespace llvm; 19198090Srdivacky 20207618SrdivackyMCSectionELF::~MCSectionELF() {} // anchor. 21198090Srdivacky 22198090Srdivacky// ShouldOmitSectionDirective - Decides whether a '.section' directive 23198090Srdivacky// should be printed before the section name 24202878Srdivackybool MCSectionELF::ShouldOmitSectionDirective(StringRef Name, 25202375Srdivacky const MCAsmInfo &MAI) const { 26239462Sdim 27198090Srdivacky // FIXME: Does .section .bss/.data/.text work everywhere?? 28202878Srdivacky if (Name == ".text" || Name == ".data" || 29202878Srdivacky (Name == ".bss" && !MAI.usesELFSectionDirectiveForBSS())) 30198090Srdivacky return true; 31198090Srdivacky 32198090Srdivacky return false; 33198090Srdivacky} 34198090Srdivacky 35263508Sdimstatic void printName(raw_ostream &OS, StringRef Name) { 36263508Sdim if (Name.find_first_not_of("0123456789_." 37263508Sdim "abcdefghijklmnopqrstuvwxyz" 38263508Sdim "ABCDEFGHIJKLMNOPQRSTUVWXYZ") == Name.npos) { 39263508Sdim OS << Name; 40263508Sdim return; 41263508Sdim } 42263508Sdim OS << '"'; 43263508Sdim for (const char *B = Name.begin(), *E = Name.end(); B < E; ++B) { 44263508Sdim if (*B == '"') // Unquoted " 45263508Sdim OS << "\\\""; 46263508Sdim else if (*B != '\\') // Neither " or backslash 47263508Sdim OS << *B; 48263508Sdim else if (B + 1 == E) // Trailing backslash 49263508Sdim OS << "\\\\"; 50263508Sdim else { 51263508Sdim OS << B[0] << B[1]; // Quoted character 52263508Sdim ++B; 53263508Sdim } 54263508Sdim } 55263508Sdim OS << '"'; 56263508Sdim} 57263508Sdim 58198090Srdivackyvoid MCSectionELF::PrintSwitchToSection(const MCAsmInfo &MAI, 59251662Sdim raw_ostream &OS, 60251662Sdim const MCExpr *Subsection) const { 61239462Sdim 62202878Srdivacky if (ShouldOmitSectionDirective(SectionName, MAI)) { 63251662Sdim OS << '\t' << getSectionName(); 64251662Sdim if (Subsection) 65251662Sdim OS << '\t' << *Subsection; 66251662Sdim OS << '\n'; 67198090Srdivacky return; 68198090Srdivacky } 69198090Srdivacky 70263508Sdim OS << "\t.section\t"; 71263508Sdim printName(OS, getSectionName()); 72221345Sdim 73198090Srdivacky // Handle the weird solaris syntax if desired. 74239462Sdim if (MAI.usesSunStyleELFSectionSwitchSyntax() && 75218893Sdim !(Flags & ELF::SHF_MERGE)) { 76218893Sdim if (Flags & ELF::SHF_ALLOC) 77198090Srdivacky OS << ",#alloc"; 78218893Sdim if (Flags & ELF::SHF_EXECINSTR) 79198090Srdivacky OS << ",#execinstr"; 80218893Sdim if (Flags & ELF::SHF_WRITE) 81198090Srdivacky OS << ",#write"; 82263508Sdim if (Flags & ELF::SHF_EXCLUDE) 83263508Sdim OS << ",#exclude"; 84218893Sdim if (Flags & ELF::SHF_TLS) 85198090Srdivacky OS << ",#tls"; 86207618Srdivacky OS << '\n'; 87207618Srdivacky return; 88207618Srdivacky } 89239462Sdim 90207618Srdivacky OS << ",\""; 91218893Sdim if (Flags & ELF::SHF_ALLOC) 92207618Srdivacky OS << 'a'; 93263508Sdim if (Flags & ELF::SHF_EXCLUDE) 94263508Sdim OS << 'e'; 95218893Sdim if (Flags & ELF::SHF_EXECINSTR) 96207618Srdivacky OS << 'x'; 97218893Sdim if (Flags & ELF::SHF_GROUP) 98218893Sdim OS << 'G'; 99218893Sdim if (Flags & ELF::SHF_WRITE) 100207618Srdivacky OS << 'w'; 101218893Sdim if (Flags & ELF::SHF_MERGE) 102207618Srdivacky OS << 'M'; 103218893Sdim if (Flags & ELF::SHF_STRINGS) 104207618Srdivacky OS << 'S'; 105218893Sdim if (Flags & ELF::SHF_TLS) 106207618Srdivacky OS << 'T'; 107239462Sdim 108207618Srdivacky // If there are target-specific flags, print them. 109218893Sdim if (Flags & ELF::XCORE_SHF_CP_SECTION) 110207618Srdivacky OS << 'c'; 111218893Sdim if (Flags & ELF::XCORE_SHF_DP_SECTION) 112207618Srdivacky OS << 'd'; 113239462Sdim 114207618Srdivacky OS << '"'; 115198090Srdivacky 116218893Sdim OS << ','; 117218893Sdim 118218893Sdim // If comment string is '@', e.g. as on ARM - use '%' instead 119218893Sdim if (MAI.getCommentString()[0] == '@') 120218893Sdim OS << '%'; 121218893Sdim else 122218893Sdim OS << '@'; 123218893Sdim 124218893Sdim if (Type == ELF::SHT_INIT_ARRAY) 125218893Sdim OS << "init_array"; 126218893Sdim else if (Type == ELF::SHT_FINI_ARRAY) 127218893Sdim OS << "fini_array"; 128218893Sdim else if (Type == ELF::SHT_PREINIT_ARRAY) 129218893Sdim OS << "preinit_array"; 130218893Sdim else if (Type == ELF::SHT_NOBITS) 131218893Sdim OS << "nobits"; 132218893Sdim else if (Type == ELF::SHT_NOTE) 133218893Sdim OS << "note"; 134218893Sdim else if (Type == ELF::SHT_PROGBITS) 135218893Sdim OS << "progbits"; 136218893Sdim 137218893Sdim if (EntrySize) { 138218893Sdim assert(Flags & ELF::SHF_MERGE); 139218893Sdim OS << "," << EntrySize; 140198090Srdivacky } 141218893Sdim 142263508Sdim if (Flags & ELF::SHF_GROUP) { 143263508Sdim OS << ","; 144263508Sdim printName(OS, Group->getName()); 145263508Sdim OS << ",comdat"; 146263508Sdim } 147198090Srdivacky OS << '\n'; 148251662Sdim 149251662Sdim if (Subsection) 150251662Sdim OS << "\t.subsection\t" << *Subsection << '\n'; 151198090Srdivacky} 152198090Srdivacky 153218893Sdimbool MCSectionELF::UseCodeAlign() const { 154218893Sdim return getFlags() & ELF::SHF_EXECINSTR; 155218893Sdim} 156198090Srdivacky 157218893Sdimbool MCSectionELF::isVirtualSection() const { 158218893Sdim return getType() == ELF::SHT_NOBITS; 159198090Srdivacky} 160198090Srdivacky 161218893Sdimunsigned MCSectionELF::DetermineEntrySize(SectionKind Kind) { 162218893Sdim if (Kind.isMergeable1ByteCString()) return 1; 163218893Sdim if (Kind.isMergeable2ByteCString()) return 2; 164218893Sdim if (Kind.isMergeable4ByteCString()) return 4; 165218893Sdim if (Kind.isMergeableConst4()) return 4; 166218893Sdim if (Kind.isMergeableConst8()) return 8; 167218893Sdim if (Kind.isMergeableConst16()) return 16; 168218893Sdim return 0; 169218893Sdim} 170