Move alignment from MCSectionData to MCSection.

This starts merging MCSection and MCSectionData.

There are a few issues with the current split between MCSection and
MCSectionData.

* It optimizes the the not as important case. We want the production
of .o files to be really fast, but the split puts the information used
for .o emission in a separate data structure.

* The ELF/COFF/MachO hierarchy is not represented in MCSectionData,
leading to some ad-hoc ways to represent the various flags.

* It makes it harder to remember where each item is.

The attached patch starts merging the two by moving the alignment from
MCSectionData to MCSection.

Most of the patch is actually just dropping 'const', since
MCSectionData is mutable, but MCSection was not.

llvm-svn: 237936

2 files changed, 4 insertions, 4 deletions

diff --git a/llvm/lib/MC/MCParser/AsmParser.cpp b/llvm/lib/MC/MCParser/AsmParser.cpp
index 85f463c2bd5..1e805fdfcf1 100644
--- a/llvm/lib/MC/MCParser/AsmParser.cpp
+++ b/llvm/lib/MC/MCParser/AsmParser.cpp
@@ -632,7 +632,7 @@ bool AsmParser::Run(bool NoInitialTextSection, bool NoFinalize) {
   if (getContext().getGenDwarfForAssembly()) {
     MCSymbol *SectionStartSym = getContext().createTempSymbol();
     getStreamer().EmitLabel(SectionStartSym);
-    const MCSection *Sec = getStreamer().getCurrentSection().first;
+    MCSection *Sec = getStreamer().getCurrentSection().first;
     bool InsertResult = getContext().addGenDwarfSection(Sec);
     assert(InsertResult && ".text section should not have debug info yet");
     (void)InsertResult;
diff --git a/llvm/lib/MC/MCParser/ELFAsmParser.cpp b/llvm/lib/MC/MCParser/ELFAsmParser.cpp
index 6b0a7785517..87b15ffe739 100644
--- a/llvm/lib/MC/MCParser/ELFAsmParser.cpp
+++ b/llvm/lib/MC/MCParser/ELFAsmParser.cpp
@@ -527,8 +527,8 @@ EndStmt:
       }
   }
 
-  const MCSection *ELFSection = getContext().getELFSection(
-      SectionName, Type, Flags, Size, GroupName, UniqueID);
+  MCSection *ELFSection = getContext().getELFSection(SectionName, Type, Flags,
+                                                     Size, GroupName, UniqueID);
   getStreamer().SwitchSection(ELFSection, Subsection);
 
   if (getContext().getGenDwarfForAssembly()) {
@@ -677,7 +677,7 @@ bool ELFAsmParser::ParseDirectiveVersion(StringRef, SMLoc) {
 
   Lex();
 
-  const MCSection *Note = getContext().getELFSection(".note", ELF::SHT_NOTE, 0);
+  MCSection *Note = getContext().getELFSection(".note", ELF::SHT_NOTE, 0);
 
   getStreamer().PushSection();
   getStreamer().SwitchSection(Note);