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ObjectFileELF: Add support for gnu-style compressed sections

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With this style, a compressed section is indicated by a "z" in the section
name, instead of a section header flag. This patch consists of two small tweaks:
- use an llvm Decompressor method in order to properly detect compressed sections
- make sure we recognise .zdebug_info (and friends) when classifying section types.

llvm-svn: 365654
This commit is contained in:
Pavel Labath
2019-07-10 16:10:43 +00:00
parent 58426a3707
commit 0ace98c9df
3 changed files with 57 additions and 29 deletions
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59
lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.cpp
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@@ -1674,38 +1674,40 @@ lldb::user_id_t ObjectFileELF::GetSectionIndexByName(const char *name) {
}
static SectionType GetSectionTypeFromName(llvm::StringRef Name) {
if (Name.consume_front(".debug_") || Name.consume_front(".zdebug_")) {
return llvm::StringSwitch<SectionType>(Name)
.Case("abbrev", eSectionTypeDWARFDebugAbbrev)
.Case("abbrev.dwo", eSectionTypeDWARFDebugAbbrevDwo)
.Case("addr", eSectionTypeDWARFDebugAddr)
.Case("aranges", eSectionTypeDWARFDebugAranges)
.Case("cu_index", eSectionTypeDWARFDebugCuIndex)
.Case("frame", eSectionTypeDWARFDebugFrame)
.Case("info", eSectionTypeDWARFDebugInfo)
.Case("info.dwo", eSectionTypeDWARFDebugInfoDwo)
.Cases("line", "line.dwo", eSectionTypeDWARFDebugLine)
.Cases("line_str", "line_str.dwo", eSectionTypeDWARFDebugLineStr)
.Cases("loc", "loc.dwo", eSectionTypeDWARFDebugLoc)
.Cases("loclists", "loclists.dwo", eSectionTypeDWARFDebugLocLists)
.Case("macinfo", eSectionTypeDWARFDebugMacInfo)
.Cases("macro", "macro.dwo", eSectionTypeDWARFDebugMacro)
.Case("names", eSectionTypeDWARFDebugNames)
.Case("pubnames", eSectionTypeDWARFDebugPubNames)
.Case("pubtypes", eSectionTypeDWARFDebugPubTypes)
.Case("ranges", eSectionTypeDWARFDebugRanges)
.Case("rnglists", eSectionTypeDWARFDebugRngLists)
.Case("str", eSectionTypeDWARFDebugStr)
.Case("str.dwo", eSectionTypeDWARFDebugStrDwo)
.Case("str_offsets", eSectionTypeDWARFDebugStrOffsets)
.Case("str_offsets.dwo", eSectionTypeDWARFDebugStrOffsetsDwo)
.Case("types", eSectionTypeDWARFDebugTypes)
.Case("types.dwo", eSectionTypeDWARFDebugTypesDwo)
.Default(eSectionTypeOther);
}
return llvm::StringSwitch<SectionType>(Name)
.Case(".ARM.exidx", eSectionTypeARMexidx)
.Case(".ARM.extab", eSectionTypeARMextab)
.Cases(".bss", ".tbss", eSectionTypeZeroFill)
.Cases(".data", ".tdata", eSectionTypeData)
.Case(".debug_abbrev", eSectionTypeDWARFDebugAbbrev)
.Case(".debug_abbrev.dwo", eSectionTypeDWARFDebugAbbrevDwo)
.Case(".debug_addr", eSectionTypeDWARFDebugAddr)
.Case(".debug_aranges", eSectionTypeDWARFDebugAranges)
.Case(".debug_cu_index", eSectionTypeDWARFDebugCuIndex)
.Case(".debug_frame", eSectionTypeDWARFDebugFrame)
.Case(".debug_info", eSectionTypeDWARFDebugInfo)
.Case(".debug_info.dwo", eSectionTypeDWARFDebugInfoDwo)
.Cases(".debug_line", ".debug_line.dwo", eSectionTypeDWARFDebugLine)
.Cases(".debug_line_str", ".debug_line_str.dwo",
eSectionTypeDWARFDebugLineStr)
.Cases(".debug_loc", ".debug_loc.dwo", eSectionTypeDWARFDebugLoc)
.Cases(".debug_loclists", ".debug_loclists.dwo",
eSectionTypeDWARFDebugLocLists)
.Case(".debug_macinfo", eSectionTypeDWARFDebugMacInfo)
.Cases(".debug_macro", ".debug_macro.dwo", eSectionTypeDWARFDebugMacro)
.Case(".debug_names", eSectionTypeDWARFDebugNames)
.Case(".debug_pubnames", eSectionTypeDWARFDebugPubNames)
.Case(".debug_pubtypes", eSectionTypeDWARFDebugPubTypes)
.Case(".debug_ranges", eSectionTypeDWARFDebugRanges)
.Case(".debug_rnglists", eSectionTypeDWARFDebugRngLists)
.Case(".debug_str", eSectionTypeDWARFDebugStr)
.Case(".debug_str.dwo", eSectionTypeDWARFDebugStrDwo)
.Case(".debug_str_offsets", eSectionTypeDWARFDebugStrOffsets)
.Case(".debug_str_offsets.dwo", eSectionTypeDWARFDebugStrOffsetsDwo)
.Case(".debug_types", eSectionTypeDWARFDebugTypes)
.Case(".debug_types.dwo", eSectionTypeDWARFDebugTypesDwo)
.Case(".eh_frame", eSectionTypeEHFrame)
.Case(".gnu_debugaltlink", eSectionTypeDWARFGNUDebugAltLink)
.Case(".gosymtab", eSectionTypeGoSymtab)
@@ -3302,7 +3304,8 @@ size_t ObjectFileELF::ReadSectionData(Section *section,
return section->GetObjectFile()->ReadSectionData(section, section_data);
size_t result = ObjectFile::ReadSectionData(section, section_data);
if (result == 0 || !section->Test(SHF_COMPRESSED))
if (result == 0 || !llvm::object::Decompressor::isCompressedELFSection(
section->Get(), section->GetName().GetStringRef()))
return result;
auto Decompressor = llvm::object::Decompressor::create(