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introduce specialized mergable const sectionkinds for elements of size 4/8/16 to

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simplify targets.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77132 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-07-26 06:11:33 +00:00
parent 7f88a20f67
commit 8ca520944e
4 changed files with 45 additions and 11 deletions
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10
lib/Target/DarwinTargetAsmInfo.cpp
View File

@@ -148,9 +148,13 @@ DarwinTargetAsmInfo::SelectSectionForGlobal(const GlobalValue *GV,
return MergeableStringSection(cast<GlobalVariable>(GV));
if (Kind.isMergableConst()) {
const Type *Ty = cast<GlobalVariable>(GV)->getInitializer()->getType();
const TargetData *TD = TM.getTargetData();
return getSectionForMergableConstant(TD->getTypeAllocSize(Ty), 0);
if (Kind.isMergableConst4())
return FourByteConstantSection;
if (Kind.isMergableConst8())
return EightByteConstantSection;
if (Kind.isMergableConst16() && SixteenByteConstantSection)
return SixteenByteConstantSection;
return ReadOnlySection; // .const
}
// FIXME: ROData -> const in -static mode that is relocatable but they happen

3
lib/Target/ELFTargetAsmInfo.cpp
View File

@@ -52,6 +52,7 @@ ELFTargetAsmInfo::SelectSectionForGlobal(const GlobalValue *GV,
if (Kind.isText()) return TextSection;
if (Kind.isMergableCString())
return MergeableStringSection(cast<GlobalVariable>(GV));
if (Kind.isMergableConst()) {
const Type *Ty = cast<GlobalVariable>(GV)->getInitializer()->getType();
const TargetData *TD = TM.getTargetData();
@@ -132,8 +133,6 @@ unsigned ELFTargetAsmInfo::getFlagsForNamedSection(const char *Name) const {
return Flags;
}
const char *
ELFTargetAsmInfo::getSectionPrefixForUniqueGlobal(SectionKind Kind) const{
if (Kind.isText()) return ".gnu.linkonce.t.";

18
lib/Target/TargetAsmInfo.cpp
View File

@@ -19,6 +19,7 @@
#include "llvm/Module.h"
#include "llvm/Type.h"
#include "llvm/Target/TargetAsmInfo.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Support/Dwarf.h"
@@ -217,7 +218,9 @@ static unsigned SectionFlagsForGlobal(const GlobalValue *GV,
}
static SectionKind SectionKindForGlobal(const GlobalValue *GV,
Reloc::Model ReloModel) {
const TargetMachine &TM) {
Reloc::Model ReloModel = TM.getRelocationModel();
// Early exit - functions should be always in text sections.
const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
if (GVar == 0)
@@ -249,8 +252,15 @@ static SectionKind SectionKindForGlobal(const GlobalValue *GV,
if (isConstantString(C))
return SectionKind::getMergableCString();
// Otherwise, just drop it into a mergable constant section.
return SectionKind::getMergableConst();
// Otherwise, just drop it into a mergable constant section. If we have
// a section for this size, use it, otherwise use the arbitrary sized
// mergable section.
switch (TM.getTargetData()->getTypeAllocSize(C->getType())) {
case 4: return SectionKind::getMergableConst4();
case 8: return SectionKind::getMergableConst8();
case 16: return SectionKind::getMergableConst16();
default: return SectionKind::getMergableConst();
}
case Constant::LocalRelocation:
// In static relocation model, the linker will resolve all addresses, so
@@ -299,7 +309,7 @@ const Section *TargetAsmInfo::SectionForGlobal(const GlobalValue *GV) const {
assert(!GV->isDeclaration() && !GV->hasAvailableExternallyLinkage() &&
"Can only be used for global definitions");
SectionKind Kind = SectionKindForGlobal(GV, TM.getRelocationModel());
SectionKind Kind = SectionKindForGlobal(GV, TM);
// Select section name.
if (GV->hasSection()) {