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Honour relocation behaviour stuff for ro objects

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68005 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov
2009-03-29 17:13:49 +00:00
parent ab267a2823
commit db2323148b
3 changed files with 29 additions and 3 deletions
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25
lib/Target/TargetAsmInfo.cpp
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@@ -19,6 +19,7 @@
#include "llvm/Module.h"
#include "llvm/Type.h"
#include "llvm/Target/TargetAsmInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Support/Dwarf.h"
#include <cctype>
@@ -189,6 +190,12 @@ static bool isConstantString(const Constant *C) {
return false;
}
unsigned TargetAsmInfo::RelocBehaviour() const {
// By default - all relocations in PIC mode would force symbol to be
// placed in r/w section.
return (TM.getRelocationModel() != Reloc::Static ?
Reloc::LocalOrGlobal : Reloc::None);
}
SectionKind::Kind
TargetAsmInfo::SectionKindForGlobal(const GlobalValue *GV) const {
@@ -208,9 +215,21 @@ TargetAsmInfo::SectionKindForGlobal(const GlobalValue *GV) const {
// check its initializer to decide, which section to output it into. Also
// note, there is no thread-local r/o section.
Constant *C = GVar->getInitializer();
if (C->ContainsRelocations())
return SectionKind::ROData;
else {
if (C->ContainsRelocations(Reloc::LocalOrGlobal)) {
// Decide, whether it is still possible to put symbol into r/o section.
unsigned Reloc = RelocBehaviour();
// We already did a query for 'all' relocs, thus - early exits.
if (Reloc == Reloc::LocalOrGlobal)
return SectionKind::Data;
else if (Reloc == Reloc::None)
return SectionKind::ROData;
else {
// Ok, target wants something funny. Honour it.
return (C->ContainsRelocations(Reloc) ?
SectionKind::Data : SectionKind::ROData);
}
} else {
// Check, if initializer is a null-terminated string
if (isConstantString(C))
return SectionKind::RODataMergeStr;