From 43ac721e3b35341e7cf59d5982ad702ca8d27433 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Tue, 13 Apr 2010 00:36:43 +0000 Subject: add llvm codegen support for -ffunction-sections and -fdata-sections, patch by Sylvere Teissier! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101106 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/TargetLoweringObjectFileImpl.cpp | 38 ++++++++++++++++++++++++++-- 1 file changed, 36 insertions(+), 2 deletions(-) (limited to 'lib/CodeGen/TargetLoweringObjectFileImpl.cpp') diff --git a/lib/CodeGen/TargetLoweringObjectFileImpl.cpp b/lib/CodeGen/TargetLoweringObjectFileImpl.cpp index dc08cadaaa..9f959932e6 100644 --- a/lib/CodeGen/TargetLoweringObjectFileImpl.cpp +++ b/lib/CodeGen/TargetLoweringObjectFileImpl.cpp @@ -279,14 +279,48 @@ static const char *getSectionPrefixForUniqueGlobal(SectionKind Kind) { return ".gnu.linkonce.d.rel.ro."; } +/// getSectionPrefixForGlobal - Return the section prefix name used by options +/// FunctionsSections and DataSections. +static const char *getSectionPrefixForGlobal(SectionKind Kind) { + if (Kind.isText()) return ".text."; + if (Kind.isReadOnly()) return ".rodata."; + + if (Kind.isThreadData()) return ".tdata."; + if (Kind.isThreadBSS()) return ".tbss."; + + if (Kind.isDataNoRel()) return ".data."; + if (Kind.isDataRelLocal()) return ".data.rel.local."; + if (Kind.isDataRel()) return ".data.rel."; + if (Kind.isReadOnlyWithRelLocal()) return ".data.rel.ro.local."; + + assert(Kind.isReadOnlyWithRel() && "Unknown section kind"); + return ".data.rel.ro."; +} + + const MCSection *TargetLoweringObjectFileELF:: SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind, Mangler *Mang, const TargetMachine &TM) const { + // If we have -ffunction-section or -fdata-section then we should emit the + // global value to a uniqued section specifically for it. + bool EmitUniquedSection; + if (Kind.isText()) + EmitUniquedSection = TM.getFunctionSections(); + else + EmitUniquedSection = TM.getDataSections(); // If this global is linkonce/weak and the target handles this by emitting it // into a 'uniqued' section name, create and return the section now. - if (GV->isWeakForLinker() && !Kind.isCommon() && !Kind.isBSS()) { - const char *Prefix = getSectionPrefixForUniqueGlobal(Kind); + if ((GV->isWeakForLinker() || EmitUniquedSection) && + !Kind.isCommon() && !Kind.isBSS()) { + const char *Prefix; + if (GV->isWeakForLinker()) + Prefix = getSectionPrefixForUniqueGlobal(Kind); + else { + assert(EmitUniquedSection); + Prefix = getSectionPrefixForGlobal(Kind); + } + SmallString<128> Name(Prefix, Prefix+strlen(Prefix)); MCSymbol *Sym = Mang->getSymbol(GV); Name.append(Sym->getName().begin(), Sym->getName().end()); -- cgit v1.2.3-18-g5258