Check in LLVM r95781.

1 files changed, 135 insertions, 0 deletions

diff --git a/lib/MC/MCSectionELF.cpp b/lib/MC/MCSectionELF.cpp
new file mode 100644
index 0000000..ebfe269
--- /dev/null
+++ b/lib/MC/MCSectionELF.cpp
@@ -0,0 +1,135 @@
+//===- 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/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace llvm;
+
+MCSectionELF *MCSectionELF::
+Create(StringRef Section, unsigned Type, unsigned Flags,
+       SectionKind K, bool isExplicit, MCContext &Ctx) {
+  return new (Ctx) MCSectionELF(Section, Type, Flags, K, isExplicit);
+}
+
+// ShouldOmitSectionDirective - Decides whether a '.section' directive
+// should be printed before the section name
+bool MCSectionELF::ShouldOmitSectionDirective(StringRef Name,
+                                              const MCAsmInfo &MAI) const {
+  
+  // FIXME: Does .section .bss/.data/.text work everywhere??
+  if (Name == ".text" || Name == ".data" ||
+      (Name == ".bss" && !MAI.usesELFSectionDirectiveForBSS()))
+    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 MCAsmInfo &MAI,
+                                        raw_ostream &OS) const {
+   
+  if (ShouldOmitSectionDirective(SectionName, MAI)) {
+    OS << '\t' << getSectionName() << '\n';
+    return;
+  }
+
+  OS << "\t.section\t" << getSectionName();
+  
+  // Handle the weird solaris syntax if desired.
+  if (MAI.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';
+    
+    // If there are target-specific flags, print them.
+    if (Flags & ~MCSectionELF::TARGET_INDEP_SHF)
+      PrintTargetSpecificSectionFlags(MAI, OS);
+    
+    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 (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';
+}
+
+// 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;
+
+  return false;
+}
+
+