add some comments: MCContext owns the MCSections, but it bump pointer allocates

[oota-llvm.git] / lib / MC / MCSection.cpp

diff --git a/lib/MC/MCSection.cpp b/lib/MC/MCSection.cpp
index 84487b24be2eda02a3346b1bdcb24de38f3be4c8..f6ac5cc5cbd08160dc6556104108c493aa7cdce1 100644 (file)
--- a/lib/MC/MCSection.cpp
+++ b/lib/MC/MCSection.cpp
@@ -9,21 +9,136 @@
 
 #include "llvm/MC/MCSection.h"
 #include "llvm/MC/MCContext.h"
+#include "llvm/Target/TargetAsmInfo.h"
+#include "llvm/Support/raw_ostream.h"
 using namespace llvm;
 
+//===----------------------------------------------------------------------===//
+// MCSection
+//===----------------------------------------------------------------------===//
+
 MCSection::~MCSection() {
 }
 
-MCSection::MCSection(const StringRef &N, bool isDirective, SectionKind K, 
-                     MCContext &Ctx)
-  : Name(N), IsDirective(isDirective), Kind(K) {
-  MCSection *&Entry = Ctx.Sections[Name];
-  assert(Entry == 0 && "Multiple sections with the same name created");
-  Entry = this;
+
+//===----------------------------------------------------------------------===//
+// MCSectionELF
+//===----------------------------------------------------------------------===//
+
+MCSectionELF *MCSectionELF::
+Create(const StringRef &Name, bool IsDirective, SectionKind K, MCContext &Ctx) {
+  return new (Ctx) MCSectionELF(Name, IsDirective, K, Ctx);
+}
+
+MCSectionELF::MCSectionELF(const StringRef &name, bool isDirective,
+                           SectionKind K, MCContext &Ctx)
+  : MCSection(K), Name(name), IsDirective(isDirective) {
+  Ctx.SetSection(Name, this);
 }
 
-MCSection *MCSection::Create(const StringRef &Name, bool IsDirective, 
-                             SectionKind K, MCContext &Ctx) {
-  return new (Ctx) MCSection(Name, IsDirective, K, Ctx);
+
+void MCSectionELF::PrintSwitchToSection(const TargetAsmInfo &TAI,
+                                        raw_ostream &OS) const {
+  if (isDirective()) {
+    OS << getName() << '\n';
+    return;
+  }
+
+  OS << "\t.section\t" << getName();
+  
+  // Handle the weird solaris syntax if desired.
+  if (TAI.usesSunStyleELFSectionSwitchSyntax() &&
+      !getKind().isMergeableConst() && !getKind().isMergeableCString()) {
+    if (!getKind().isMetadata())
+      OS << ",#alloc";
+    if (getKind().isText())
+      OS << ",#execinstr";
+    if (getKind().isWriteable())
+      OS << ",#write";
+    if (getKind().isThreadLocal())
+      OS << ",#tls";
+  } else {
+    OS << ",\"";
+  
+    if (!getKind().isMetadata())
+      OS << 'a';
+    if (getKind().isText())
+      OS << 'x';
+    if (getKind().isWriteable())
+      OS << 'w';
+    if (getKind().isMergeable1ByteCString() ||
+        getKind().isMergeable2ByteCString() ||
+        getKind().isMergeable4ByteCString() ||
+        getKind().isMergeableConst4() ||
+        getKind().isMergeableConst8() ||
+        getKind().isMergeableConst16())
+      OS << 'M';
+    if (getKind().isMergeable1ByteCString() ||
+        getKind().isMergeable2ByteCString() ||
+        getKind().isMergeable4ByteCString())
+      OS << 'S';
+    if (getKind().isThreadLocal())
+      OS << 'T';
+    
+    OS << "\",";
+    
+    // If comment string is '@', e.g. as on ARM - use '%' instead
+    if (TAI.getCommentString()[0] == '@')
+      OS << '%';
+    else
+      OS << '@';
+    
+    if (getKind().isBSS() || getKind().isThreadBSS())
+      OS << "nobits";
+    else
+      OS << "progbits";
+    
+    if (getKind().isMergeable1ByteCString()) {
+      OS << ",1";
+    } else if (getKind().isMergeable2ByteCString()) {
+      OS << ",2";
+    } else if (getKind().isMergeable4ByteCString()) {
+      OS << ",4";
+    } else if (getKind().isMergeableConst4()) {
+      OS << ",4";
+    } else if (getKind().isMergeableConst8()) {
+      OS << ",8";
+    } else if (getKind().isMergeableConst16()) {
+      OS << ",16";
+    }
+  }
+  
+  OS << '\n';
 }
 
+
+//===----------------------------------------------------------------------===//
+// MCSectionCOFF
+//===----------------------------------------------------------------------===//
+
+MCSectionCOFF *MCSectionCOFF::
+Create(const StringRef &Name, bool IsDirective, SectionKind K, MCContext &Ctx) {
+  return new (Ctx) MCSectionCOFF(Name, IsDirective, K, Ctx);
+}
+
+MCSectionCOFF::MCSectionCOFF(const StringRef &name, bool isDirective,
+                             SectionKind K, MCContext &Ctx)
+  : MCSection(K), Name(name), IsDirective(isDirective) {
+  Ctx.SetSection(Name, this);
+}
+
+
+void MCSectionCOFF::PrintSwitchToSection(const TargetAsmInfo &TAI,
+                                         raw_ostream &OS) const {
+  
+  if (isDirective()) {
+    OS << getName() << '\n';
+    return;
+  }
+  OS << "\t.section\t" << getName() << ",\"";
+  if (getKind().isText())
+    OS << 'x';
+  if (getKind().isWriteable())
+    OS << 'w';
+  OS << "\"\n";
+}