[llvm-objcopy] Add --prefix-symbols option

Differential Revision: https://reviews.llvm.org/D50381

llvm-svn: 339362

3 files changed, 9 insertions, 1 deletions

diff --git a/llvm/tools/llvm-objcopy/ObjcopyOpts.td b/llvm/tools/llvm-objcopy/ObjcopyOpts.td
index 9b872540e91..5e3ac1f7947 100644
--- a/llvm/tools/llvm-objcopy/ObjcopyOpts.td
+++ b/llvm/tools/llvm-objcopy/ObjcopyOpts.td
@@ -105,3 +105,6 @@ def keep_file_symbols : Flag<["-", "--"], "keep-file-symbols">,
 defm dump_section : Eq<"dump-section">,
                    MetaVarName<"section=file">,
                    HelpText<"Dump contents of section named <section> into file <file>">;
+defm prefix_symbols : Eq<"prefix-symbols">,
+                       MetaVarName<"prefix">,
+                       HelpText<"Add <prefix> to the start of every symbol name">;
diff --git a/llvm/tools/llvm-objcopy/Object.h b/llvm/tools/llvm-objcopy/Object.h
index ba6aea93505..525c5e3a775 100644
--- a/llvm/tools/llvm-objcopy/Object.h
+++ b/llvm/tools/llvm-objcopy/Object.h
@@ -387,7 +387,7 @@ struct Symbol {
   SectionBase *DefinedIn = nullptr;
   SymbolShndxType ShndxType;
   uint32_t Index;
-  StringRef Name;
+  std::string Name;
   uint32_t NameIndex;
   uint64_t Size;
   uint8_t Type;
diff --git a/llvm/tools/llvm-objcopy/llvm-objcopy.cpp b/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
index 0c153d521c7..92b882ae649 100644
--- a/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
+++ b/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
@@ -133,6 +133,7 @@ struct CopyConfig {
 
   StringRef SplitDWO;
   StringRef AddGnuDebugLink;
+  StringRef SymbolsPrefix;
   std::vector<StringRef> ToRemove;
   std::vector<StringRef> Keep;
   std::vector<StringRef> OnlyKeep;
@@ -388,6 +389,9 @@ static void HandleArgs(const CopyConfig &Config, Object &Obj,
       const auto I = Config.SymbolsToRename.find(Sym.Name);
       if (I != Config.SymbolsToRename.end())
         Sym.Name = I->getValue();
+
+      if (!Config.SymbolsPrefix.empty() && Sym.Type != STT_SECTION)
+        Sym.Name = (Config.SymbolsPrefix + Sym.Name).str();
     });
 
     // The purpose of this loop is to mark symbols referenced by sections
@@ -723,6 +727,7 @@ static CopyConfig ParseObjcopyOptions(ArrayRef<const char *> ArgsArr) {
 
   Config.SplitDWO = InputArgs.getLastArgValue(OBJCOPY_split_dwo);
   Config.AddGnuDebugLink = InputArgs.getLastArgValue(OBJCOPY_add_gnu_debuglink);
+  Config.SymbolsPrefix = InputArgs.getLastArgValue(OBJCOPY_prefix_symbols);
 
   for (auto Arg : InputArgs.filtered(OBJCOPY_redefine_symbol)) {
     if (!StringRef(Arg->getValue()).contains('='))