From 7400a979521a70be4d69071271e4543014fbfcf5 Mon Sep 17 00:00:00 2001 From: David Blaikie Date: Thu, 27 Mar 2014 20:45:58 +0000 Subject: DebugInfo: Support for compressed debug info sections 1) When creating a .debug_* section and instead create a .zdebug_ section. 2) When creating a fragment in a .zdebug_* section, make it a compressed fragment. 3) When computing the size of a compressed section, compress the data and use the size of the compressed data. 4) Emit the compressed bytes. Also, check that only if a section has a compressed fragment, then that is the only fragment in the section. Assert-fail if the fragment's data is modified after it is compressed. Initial review on llvm-commits by Eric Christopher and Rafael Espindola. llvm-svn: 204958 --- llvm/lib/MC/MCContext.cpp | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) (limited to 'llvm/lib/MC/MCContext.cpp') diff --git a/llvm/lib/MC/MCContext.cpp b/llvm/lib/MC/MCContext.cpp index ede3b3cd235..b228d18ba7f 100644 --- a/llvm/lib/MC/MCContext.cpp +++ b/llvm/lib/MC/MCContext.cpp @@ -37,13 +37,13 @@ typedef std::map COFFUniqueMapTy; MCContext::MCContext(const MCAsmInfo *mai, const MCRegisterInfo *mri, const MCObjectFileInfo *mofi, const SourceMgr *mgr, - bool DoAutoReset) : - SrcMgr(mgr), MAI(mai), MRI(mri), MOFI(mofi), - Allocator(), Symbols(Allocator), UsedNames(Allocator), - NextUniqueID(0), - CurrentDwarfLoc(0,0,0,DWARF2_FLAG_IS_STMT,0,0), - DwarfLocSeen(false), GenDwarfForAssembly(false), GenDwarfFileNumber(0), - AllowTemporaryLabels(true), DwarfCompileUnitID(0), AutoReset(DoAutoReset) { + bool DoAutoReset) + : SrcMgr(mgr), MAI(mai), MRI(mri), MOFI(mofi), Allocator(), + Symbols(Allocator), UsedNames(Allocator), NextUniqueID(0), + CurrentDwarfLoc(0, 0, 0, DWARF2_FLAG_IS_STMT, 0, 0), DwarfLocSeen(false), + GenDwarfForAssembly(false), GenDwarfFileNumber(0), + AllowTemporaryLabels(true), DwarfCompileUnitID(0), + AutoReset(DoAutoReset) { error_code EC = llvm::sys::fs::current_path(CompilationDir); if (EC) @@ -251,6 +251,11 @@ getELFSection(StringRef Section, unsigned Type, unsigned Flags, ELFUniquingMap = new ELFUniqueMapTy(); ELFUniqueMapTy &Map = *(ELFUniqueMapTy*)ELFUniquingMap; + SmallString<32> ZDebugName; + if (MAI->compressDebugSections() && Section.startswith(".debug_") && + Section != ".debug_frame") + Section = (".z" + Section.drop_front(1)).toStringRef(ZDebugName); + // Do the lookup, if we have a hit, return it. std::pair Entry = Map.insert( std::make_pair(SectionGroupPair(Section, Group), (MCSectionELF *)0)); -- cgit v1.2.3