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implement support for uniquing MachO sections.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78866 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-08-12 23:55:02 +00:00
parent 9bf0b9bd44
commit 5dc47ff039
2 changed files with 47 additions and 15 deletions
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25
include/llvm/Target/TargetLoweringObjectFile.h
View File

@ -20,6 +20,7 @@
namespace llvm {
class Mangler;
class MCSection;
class MCSectionMachO;
class MCContext;
class GlobalValue;
class StringRef;
@ -28,6 +29,9 @@ namespace llvm {
class TargetLoweringObjectFile {
MCContext *Ctx;
TargetLoweringObjectFile(const TargetLoweringObjectFile&); // DO NOT IMPLEMENT
void operator=(const TargetLoweringObjectFile&); // DO NOT IMPLEMENT
protected:
TargetLoweringObjectFile();
@ -225,6 +229,8 @@ public:
class TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
mutable void *UniquingMap;
const MCSection *CStringSection;
const MCSection *UStringSection;
const MCSection *TextCoalSection;
@ -236,6 +242,8 @@ class TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
const MCSection *EightByteConstantSection;
const MCSection *SixteenByteConstantSection;
public:
TargetLoweringObjectFileMachO() : UniquingMap(0) {}
~TargetLoweringObjectFileMachO();
virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
@ -257,16 +265,17 @@ public:
/// getMachOSection - Return the MCSection for the specified mach-o section.
/// This requires the operands to be valid.
const MCSection *getMachOSection(const StringRef &Segment,
const StringRef &Section,
unsigned TypeAndAttributes,
SectionKind K) const {
const MCSectionMachO *getMachOSection(const StringRef &Segment,
const StringRef &Section,
unsigned TypeAndAttributes,
SectionKind K) const {
return getMachOSection(Segment, Section, TypeAndAttributes, 0, K);
}
const MCSection *getMachOSection(const StringRef &Segment,
const StringRef &Section,
unsigned TypeAndAttributes,
unsigned Reserved2, SectionKind K) const;
const MCSectionMachO *getMachOSection(const StringRef &Segment,
const StringRef &Section,
unsigned TypeAndAttributes,
unsigned Reserved2,
SectionKind K) const;
/// getTextCoalSection - Return the "__TEXT,__textcoal_nt" section we put weak
/// symbols into.

37
lib/Target/TargetLoweringObjectFile.cpp
View File

@ -24,6 +24,7 @@
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Support/Mangler.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
using namespace llvm;
@ -129,7 +130,6 @@ SectionKind TargetLoweringObjectFile::getKindForGlobal(const GlobalValue *GV,
if (GVar == 0)
return SectionKind::getText();
// Handle thread-local data first.
if (GVar->isThreadLocal()) {
if (isSuitableForBSS(GVar))
@ -509,17 +509,40 @@ getSectionForConstant(SectionKind Kind) const {
// MachO
//===----------------------------------------------------------------------===//
typedef StringMap<const MCSectionMachO*> MachOUniqueMapTy;
const MCSection *TargetLoweringObjectFileMachO::
TargetLoweringObjectFileMachO::~TargetLoweringObjectFileMachO() {
// If we have the MachO uniquing map, free it.
delete (MachOUniqueMapTy*)UniquingMap;
}
const MCSectionMachO *TargetLoweringObjectFileMachO::
getMachOSection(const StringRef &Segment, const StringRef &Section,
unsigned TypeAndAttributes,
unsigned Reserved2, SectionKind Kind) const {
// FIXME: UNIQUE HERE.
//if (MCSection *S = getContext().GetSection(Name))
// return S;
// We unique sections by their segment/section pair. The returned section
// may not have the same flags as the requested section, if so this should be
// diagnosed by the client as an error.
return MCSectionMachO::Create(Segment, Section, TypeAndAttributes, Reserved2,
Kind, getContext());
// Create the map if it doesn't already exist.
if (UniquingMap == 0)
UniquingMap = new MachOUniqueMapTy();
MachOUniqueMapTy &Map = *(MachOUniqueMapTy*)UniquingMap;
// Form the name to look up.
SmallString<64> Name;
Name.append(Segment.begin(), Segment.end());
Name.push_back(',');
Name.append(Section.begin(), Section.end());
// Do the lookup, if we have a hit, return it.
const MCSectionMachO *&Entry = Map[StringRef(Name.data(), Name.size())];
if (Entry) return Entry;
// Otherwise, return a new section.
return Entry = MCSectionMachO::Create(Segment, Section, TypeAndAttributes,
Reserved2, Kind, getContext());
}