[llvm-readobj,ELF] Support --decompress/-z (#82594)

When a section has the SHF_COMPRESSED flag, -p/-x dump the compressed
content by default. In GNU readelf, if --decompress/-z is specified,
-p/-x will dump the decompressed content. This patch implements the
option.

Close #82507

1 files changed, 4 insertions, 2 deletions

diff --git a/llvm/tools/llvm-readobj/llvm-readobj.cpp b/llvm/tools/llvm-readobj/llvm-readobj.cpp
index f9d605d..979433d 100644
--- a/llvm/tools/llvm-readobj/llvm-readobj.cpp
+++ b/llvm/tools/llvm-readobj/llvm-readobj.cpp
@@ -97,6 +97,7 @@ static bool ArchSpecificInfo;
 static bool BBAddrMap;
 bool ExpandRelocs;
 static bool CGProfile;
+static bool Decompress;
 bool Demangle;
 static bool DependentLibraries;
 static bool DynRelocs;
@@ -212,6 +213,7 @@ static void parseOptions(const opt::InputArgList &Args) {
   opts::ArchSpecificInfo = Args.hasArg(OPT_arch_specific);
   opts::BBAddrMap = Args.hasArg(OPT_bb_addr_map);
   opts::CGProfile = Args.hasArg(OPT_cg_profile);
+  opts::Decompress = Args.hasArg(OPT_decompress);
   opts::Demangle = Args.hasFlag(OPT_demangle, OPT_no_demangle, false);
   opts::DependentLibraries = Args.hasArg(OPT_dependent_libraries);
   opts::DynRelocs = Args.hasArg(OPT_dyn_relocations);
@@ -439,9 +441,9 @@ static void dumpObject(ObjectFile &Obj, ScopedPrinter &Writer,
     Dumper->printSymbols(opts::Symbols, opts::DynamicSymbols,
                          opts::ExtraSymInfo, SymComp);
   if (!opts::StringDump.empty())
-    Dumper->printSectionsAsString(Obj, opts::StringDump);
+    Dumper->printSectionsAsString(Obj, opts::StringDump, opts::Decompress);
   if (!opts::HexDump.empty())
-    Dumper->printSectionsAsHex(Obj, opts::HexDump);
+    Dumper->printSectionsAsHex(Obj, opts::HexDump, opts::Decompress);
   if (opts::HashTable)
     Dumper->printHashTable();
   if (opts::GnuHashTable)