#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCSymbol.h"
+#include "llvm/Support/ELF.h"
#include "llvm/Support/raw_ostream.h"
+
using namespace llvm;
MCSectionELF::~MCSectionELF() {} // anchor.
-// ShouldOmitSectionDirective - Decides whether a '.section' directive
-// should be printed before the section name
+// Decides whether a '.section' directive
+// should be printed before the section name.
bool MCSectionELF::ShouldOmitSectionDirective(StringRef Name,
const MCAsmInfo &MAI) const {
-
+
+ if (isUnique())
+ return false;
+
// FIXME: Does .section .bss/.data/.text work everywhere??
if (Name == ".text" || Name == ".data" ||
(Name == ".bss" && !MAI.usesELFSectionDirectiveForBSS()))
return false;
}
-// ShouldPrintSectionType - Only prints the section type if supported
-bool MCSectionELF::ShouldPrintSectionType(unsigned Ty) const {
- if (IsExplicit && !(Ty == SHT_NOBITS || Ty == SHT_PROGBITS))
- return false;
-
- return true;
+static void printName(raw_ostream &OS, StringRef Name) {
+ if (Name.find_first_not_of("0123456789_."
+ "abcdefghijklmnopqrstuvwxyz"
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ") == Name.npos) {
+ OS << Name;
+ return;
+ }
+ OS << '"';
+ for (const char *B = Name.begin(), *E = Name.end(); B < E; ++B) {
+ if (*B == '"') // Unquoted "
+ OS << "\\\"";
+ else if (*B != '\\') // Neither " or backslash
+ OS << *B;
+ else if (B + 1 == E) // Trailing backslash
+ OS << "\\\\";
+ else {
+ OS << B[0] << B[1]; // Quoted character
+ ++B;
+ }
+ }
+ OS << '"';
}
void MCSectionELF::PrintSwitchToSection(const MCAsmInfo &MAI,
- raw_ostream &OS) const {
-
+ raw_ostream &OS,
+ const MCExpr *Subsection) const {
+
if (ShouldOmitSectionDirective(SectionName, MAI)) {
- OS << '\t' << getSectionName() << '\n';
+ OS << '\t' << getSectionName();
+ if (Subsection)
+ OS << '\t' << *Subsection;
+ OS << '\n';
return;
}
- OS << "\t.section\t" << getSectionName();
-
+ OS << "\t.section\t";
+ printName(OS, getSectionName());
+
// Handle the weird solaris syntax if desired.
- if (MAI.usesSunStyleELFSectionSwitchSyntax() &&
- !(Flags & MCSectionELF::SHF_MERGE)) {
- if (Flags & MCSectionELF::SHF_ALLOC)
+ if (MAI.usesSunStyleELFSectionSwitchSyntax() &&
+ !(Flags & ELF::SHF_MERGE)) {
+ if (Flags & ELF::SHF_ALLOC)
OS << ",#alloc";
- if (Flags & MCSectionELF::SHF_EXECINSTR)
+ if (Flags & ELF::SHF_EXECINSTR)
OS << ",#execinstr";
- if (Flags & MCSectionELF::SHF_WRITE)
+ if (Flags & ELF::SHF_WRITE)
OS << ",#write";
- if (Flags & MCSectionELF::SHF_TLS)
+ if (Flags & ELF::SHF_EXCLUDE)
+ OS << ",#exclude";
+ if (Flags & ELF::SHF_TLS)
OS << ",#tls";
OS << '\n';
return;
}
-
+
OS << ",\"";
- if (Flags & MCSectionELF::SHF_ALLOC)
+ if (Flags & ELF::SHF_ALLOC)
OS << 'a';
- if (Flags & MCSectionELF::SHF_EXECINSTR)
+ if (Flags & ELF::SHF_EXCLUDE)
+ OS << 'e';
+ if (Flags & ELF::SHF_EXECINSTR)
OS << 'x';
- if (Flags & MCSectionELF::SHF_WRITE)
+ if (Flags & ELF::SHF_GROUP)
+ OS << 'G';
+ if (Flags & ELF::SHF_WRITE)
OS << 'w';
- if (Flags & MCSectionELF::SHF_MERGE)
+ if (Flags & ELF::SHF_MERGE)
OS << 'M';
- if (Flags & MCSectionELF::SHF_STRINGS)
+ if (Flags & ELF::SHF_STRINGS)
OS << 'S';
- if (Flags & MCSectionELF::SHF_TLS)
+ if (Flags & ELF::SHF_TLS)
OS << 'T';
-
+
// If there are target-specific flags, print them.
- if (Flags & MCSectionELF::XCORE_SHF_CP_SECTION)
+ if (Flags & ELF::XCORE_SHF_CP_SECTION)
OS << 'c';
- if (Flags & MCSectionELF::XCORE_SHF_DP_SECTION)
+ if (Flags & ELF::XCORE_SHF_DP_SECTION)
OS << 'd';
-
+
OS << '"';
- if (ShouldPrintSectionType(Type)) {
- OS << ',';
-
- // If comment string is '@', e.g. as on ARM - use '%' instead
- if (MAI.getCommentString()[0] == '@')
- OS << '%';
- else
- OS << '@';
-
- if (Type == MCSectionELF::SHT_INIT_ARRAY)
- OS << "init_array";
- else if (Type == MCSectionELF::SHT_FINI_ARRAY)
- OS << "fini_array";
- else if (Type == MCSectionELF::SHT_PREINIT_ARRAY)
- OS << "preinit_array";
- else if (Type == MCSectionELF::SHT_NOBITS)
- OS << "nobits";
- else if (Type == MCSectionELF::SHT_PROGBITS)
- OS << "progbits";
-
- if (EntrySize) {
- OS << "," << EntrySize;
- }
+ OS << ',';
+
+ // If comment string is '@', e.g. as on ARM - use '%' instead
+ if (MAI.getCommentString()[0] == '@')
+ OS << '%';
+ else
+ OS << '@';
+
+ if (Type == ELF::SHT_INIT_ARRAY)
+ OS << "init_array";
+ else if (Type == ELF::SHT_FINI_ARRAY)
+ OS << "fini_array";
+ else if (Type == ELF::SHT_PREINIT_ARRAY)
+ OS << "preinit_array";
+ else if (Type == ELF::SHT_NOBITS)
+ OS << "nobits";
+ else if (Type == ELF::SHT_NOTE)
+ OS << "note";
+ else if (Type == ELF::SHT_PROGBITS)
+ OS << "progbits";
+
+ if (EntrySize) {
+ assert(Flags & ELF::SHF_MERGE);
+ OS << "," << EntrySize;
}
-
+
+ if (Flags & ELF::SHF_GROUP) {
+ OS << ",";
+ printName(OS, Group->getName());
+ OS << ",comdat";
+ }
+
+ if (isUnique())
+ OS << ",unique," << UniqueID;
+
OS << '\n';
-}
-// HasCommonSymbols - True if this section holds common symbols, this is
-// indicated on the ELF object file by a symbol with SHN_COMMON section
-// header index.
-bool MCSectionELF::HasCommonSymbols() const {
-
- if (StringRef(SectionName).startswith(".gnu.linkonce."))
- return true;
+ if (Subsection)
+ OS << "\t.subsection\t" << *Subsection << '\n';
+}
- return false;
+bool MCSectionELF::UseCodeAlign() const {
+ return getFlags() & ELF::SHF_EXECINSTR;
}
-unsigned MCSectionELF::DetermineEntrySize(SectionKind Kind) {
- if (Kind.isMergeable1ByteCString()) return 1;
- if (Kind.isMergeable2ByteCString()) return 2;
- if (Kind.isMergeable4ByteCString()) return 4;
- if (Kind.isMergeableConst4()) return 4;
- if (Kind.isMergeableConst8()) return 8;
- if (Kind.isMergeableConst16()) return 16;
- return 0;
+bool MCSectionELF::isVirtualSection() const {
+ return getType() == ELF::SHT_NOBITS;
}
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