From c16c75ea9bb6aee277e8ca6ace41b3e852ae382e Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Sun, 2 Aug 2009 01:34:32 +0000 Subject: move getDwarfExceptionSection from TAI to TLOF and rename it to getLSDASection() to be more specific. This makes it pretty obvious that the ELF LSDA section is being specified wrong in PIC mode. We're probably getting a lot of startup-time relocations to a readonly page, which is expensive and bad. Someone who cares about ELF C++ should investigate this. llvm-svn: 77847 --- llvm/lib/Target/TargetLoweringObjectFile.cpp | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'llvm/lib/Target/TargetLoweringObjectFile.cpp') diff --git a/llvm/lib/Target/TargetLoweringObjectFile.cpp b/llvm/lib/Target/TargetLoweringObjectFile.cpp index a86946d..d04e5c0 100644 --- a/llvm/lib/Target/TargetLoweringObjectFile.cpp +++ b/llvm/lib/Target/TargetLoweringObjectFile.cpp @@ -36,6 +36,7 @@ TargetLoweringObjectFile::TargetLoweringObjectFile() : Ctx(0) { ReadOnlySection = 0; StaticCtorSection = 0; StaticDtorSection = 0; + LSDASection = 0; } TargetLoweringObjectFile::~TargetLoweringObjectFile() { @@ -302,6 +303,14 @@ void TargetLoweringObjectFileELF::Initialize(MCContext &Ctx, getOrCreateSection(".ctors", false, SectionKind::getDataRel()); StaticDtorSection = getOrCreateSection(".dtors", false, SectionKind::getDataRel()); + + + // FIXME: We're emitting LSDA info into a readonly section on ELF, even though + // it contains relocatable pointers. In PIC mode, this is probably a big + // runtime hit for C++ apps. Either the contents of the LSDA need to be + // adjusted or this should be a data section. + LSDASection = + getOrCreateSection(".gcc_except_table", false, SectionKind::getReadOnly()); } @@ -537,6 +546,8 @@ void TargetLoweringObjectFileMachO::Initialize(MCContext &Ctx, getOrCreateSection(".mod_term_func", true, SectionKind::getDataRel()); } + LSDASection = getOrCreateSection("__DATA,__gcc_except_tab", false, + SectionKind::getDataRel()); } const MCSection *TargetLoweringObjectFileMachO:: -- cgit v1.1