Change MCSectionELF to represent a section semantically instead of
syntactically as a string, very similiar to what Chris did with MachO.
The parsing support and validation is not introduced yet.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78890 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCSectionELF.cpp b/lib/MC/MCSectionELF.cpp
new file mode 100644
index 0000000..d172a9c
--- /dev/null
+++ b/lib/MC/MCSectionELF.cpp
@@ -0,0 +1,123 @@
+//===- lib/MC/MCSectionELF.cpp - ELF Code Section Representation ----------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/MC/MCSectionELF.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Target/TargetAsmInfo.h"
+
+using namespace llvm;
+
+MCSectionELF *MCSectionELF::
+Create(const StringRef &Section, unsigned Type, unsigned Flags,
+ SectionKind K, bool hasCrazyBSS, bool isExplicit, MCContext &Ctx) {
+ return new
+ (Ctx) MCSectionELF(Section, Type, Flags, K, hasCrazyBSS, isExplicit);
+}
+
+// ShouldOmitSectionDirective - Decides whether a '.section' directive
+// should be printed before the section name
+bool MCSectionELF::ShouldOmitSectionDirective(const char *Name) const {
+
+ // PPC/Linux doesn't support the .bss directive, it needs .section .bss.
+ // FIXME: Does .section .bss/.data/.text work everywhere??
+ if ((!HasCrazyBSS && strncmp(Name, ".bss", 4) == 0) ||
+ strncmp(Name, ".text", 5) == 0 ||
+ strncmp(Name, ".data", 5) == 0)
+ return true;
+
+ 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;
+}
+
+void MCSectionELF::PrintSwitchToSection(const TargetAsmInfo &TAI,
+ raw_ostream &OS) const {
+
+ if (ShouldOmitSectionDirective(SectionName.c_str())) {
+ OS << '\t' << getSectionName() << '\n';
+ return;
+ }
+
+ OS << "\t.section\t" << getSectionName();
+
+ // Handle the weird solaris syntax if desired.
+ if (TAI.usesSunStyleELFSectionSwitchSyntax() &&
+ !(Flags & MCSectionELF::SHF_MERGE)) {
+ if (Flags & MCSectionELF::SHF_ALLOC)
+ OS << ",#alloc";
+ if (Flags & MCSectionELF::SHF_EXECINSTR)
+ OS << ",#execinstr";
+ if (Flags & MCSectionELF::SHF_WRITE)
+ OS << ",#write";
+ if (Flags & MCSectionELF::SHF_TLS)
+ OS << ",#tls";
+ } else {
+ OS << ",\"";
+
+ if (Flags & MCSectionELF::SHF_ALLOC)
+ OS << 'a';
+ if (Flags & MCSectionELF::SHF_EXECINSTR)
+ OS << 'x';
+ if (Flags & MCSectionELF::SHF_WRITE)
+ OS << 'w';
+ if (Flags & MCSectionELF::SHF_MERGE)
+ OS << 'M';
+ if (Flags & MCSectionELF::SHF_STRINGS)
+ OS << 'S';
+ if (Flags & MCSectionELF::SHF_TLS)
+ OS << 'T';
+
+ OS << '"';
+
+ if (ShouldPrintSectionType(Type)) {
+ OS << ',';
+
+ // If comment string is '@', e.g. as on ARM - use '%' instead
+ if (TAI.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 (getKind().isMergeable1ByteCString()) {
+ OS << ",1";
+ } else if (getKind().isMergeable2ByteCString()) {
+ OS << ",2";
+ } else if (getKind().isMergeable4ByteCString() ||
+ getKind().isMergeableConst4()) {
+ OS << ",4";
+ } else if (getKind().isMergeableConst8()) {
+ OS << ",8";
+ } else if (getKind().isMergeableConst16()) {
+ OS << ",16";
+ }
+ }
+ }
+
+ OS << '\n';
+}
+