vendor/llvm-project/llvmorg-11-init-20887-g2e10b7a39b9vendor/llvm-project/master

1 files changed, 12 insertions, 20 deletions

diff --git a/lld/COFF/Symbols.cpp b/lld/COFF/Symbols.cpp
index 938c9c527ffa..60ff72aeb522 100644
--- a/lld/COFF/Symbols.cpp
+++ b/lld/COFF/Symbols.cpp
@@ -36,12 +36,12 @@ static std::string maybeDemangleSymbol(StringRef symName) {
     StringRef demangleInput = prefixless;
     if (config->machine == I386)
       demangleInput.consume_front("_");
-    std::string demangled = demangle(demangleInput);
+    std::string demangled = demangle(std::string(demangleInput));
     if (demangled != demangleInput)
-      return prefix + demangle(demangleInput);
+      return prefix + demangle(std::string(demangleInput));
     return (prefix + prefixless).str();
   }
-  return symName;
+  return std::string(symName);
 }
 std::string toString(coff::Symbol &b) {
   return maybeDemangleSymbol(b.getName());
@@ -52,23 +52,15 @@ std::string toCOFFString(const Archive::Symbol &b) {
 
 namespace coff {
 
-StringRef Symbol::getName() {
-  // COFF symbol names are read lazily for a performance reason.
-  // Non-external symbol names are never used by the linker except for logging
-  // or debugging. Their internal references are resolved not by name but by
-  // symbol index. And because they are not external, no one can refer them by
-  // name. Object files contain lots of non-external symbols, and creating
-  // StringRefs for them (which involves lots of strlen() on the string table)
-  // is a waste of time.
-  if (nameData == nullptr) {
-    auto *d = cast<DefinedCOFF>(this);
-    StringRef nameStr;
-    cast<ObjFile>(d->file)->getCOFFObj()->getSymbolName(d->sym, nameStr);
-    nameData = nameStr.data();
-    nameSize = nameStr.size();
-    assert(nameSize == nameStr.size() && "name length truncated");
-  }
-  return StringRef(nameData, nameSize);
+void Symbol::computeName() {
+  assert(nameData == nullptr &&
+         "should only compute the name once for DefinedCOFF symbols");
+  auto *d = cast<DefinedCOFF>(this);
+  StringRef nameStr =
+      check(cast<ObjFile>(d->file)->getCOFFObj()->getSymbolName(d->sym));
+  nameData = nameStr.data();
+  nameSize = nameStr.size();
+  assert(nameSize == nameStr.size() && "name length truncated");
 }
 
 InputFile *Symbol::getFile() {