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Move alignment from MCSectionData to MCSection.

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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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237936 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2015-05-21 19:20:38 +00:00
parent 4c919af335
commit 7521964d28
85 changed files with 619 additions and 686 deletions
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22
lib/Target/TargetLoweringObjectFile.cpp
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@@ -255,12 +255,13 @@ SectionKind TargetLoweringObjectFile::getKindForGlobal(const GlobalValue *GV,
llvm_unreachable("Invalid relocation");
}
/// SectionForGlobal - This method computes the appropriate section to emit
/// the specified global variable or function definition. This should not
/// be passed external (or available externally) globals.
const MCSection *TargetLoweringObjectFile::
SectionForGlobal(const GlobalValue *GV, SectionKind Kind, Mangler &Mang,
const TargetMachine &TM) const {
/// This method computes the appropriate section to emit the specified global
/// variable or function definition. This should not be passed external (or
/// available externally) globals.
MCSection *
TargetLoweringObjectFile::SectionForGlobal(const GlobalValue *GV,
SectionKind Kind, Mangler &Mang,
const TargetMachine &TM) const {
// Select section name.
if (GV->hasSection())
return getExplicitSectionGlobal(GV, Kind, Mang, TM);
@@ -270,7 +271,7 @@ SectionForGlobal(const GlobalValue *GV, SectionKind Kind, Mangler &Mang,
return SelectSectionForGlobal(GV, Kind, Mang, TM);
}
const MCSection *TargetLoweringObjectFile::getSectionForJumpTable(
MCSection *TargetLoweringObjectFile::getSectionForJumpTable(
const Function &F, Mangler &Mang, const TargetMachine &TM) const {
return getSectionForConstant(SectionKind::getReadOnly(), /*C=*/nullptr);
}
@@ -293,10 +294,9 @@ bool TargetLoweringObjectFile::shouldPutJumpTableInFunctionSection(
return false;
}
/// getSectionForConstant - Given a mergable constant with the
/// specified size and relocation information, return a section that it
/// should be placed in.
const MCSection *
/// Given a mergable constant with the specified size and relocation
/// information, return a section that it should be placed in.
MCSection *
TargetLoweringObjectFile::getSectionForConstant(SectionKind Kind,
const Constant *C) const {
if (Kind.isReadOnly() && ReadOnlySection != nullptr)