1 files changed, 22 insertions, 22 deletions

diff --git a/llvm/lib/Demangle/Demangle.cpp b/llvm/lib/Demangle/Demangle.cpp
index 9d128424cabf..f2aa571d685f 100644
--- a/llvm/lib/Demangle/Demangle.cpp
+++ b/llvm/lib/Demangle/Demangle.cpp
@@ -11,45 +11,45 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Demangle/Demangle.h"
+#include "llvm/Demangle/StringViewExtras.h"
 #include <cstdlib>
-#include <cstring>
+#include <string_view>
 
-static bool isItaniumEncoding(const char *S) {
-  // Itanium encoding requires 1 or 3 leading underscores, followed by 'Z'.
-  return std::strncmp(S, "_Z", 2) == 0 || std::strncmp(S, "___Z", 4) == 0;
-}
-
-static bool isRustEncoding(const char *S) { return S[0] == '_' && S[1] == 'R'; }
-
-static bool isDLangEncoding(const std::string &MangledName) {
-  return MangledName.size() >= 2 && MangledName[0] == '_' &&
-         MangledName[1] == 'D';
-}
+using llvm::itanium_demangle::starts_with;
 
-std::string llvm::demangle(const std::string &MangledName) {
+std::string llvm::demangle(std::string_view MangledName) {
   std::string Result;
-  const char *S = MangledName.c_str();
 
-  if (nonMicrosoftDemangle(S, Result))
+  if (nonMicrosoftDemangle(MangledName, Result))
     return Result;
 
-  if (S[0] == '_' && nonMicrosoftDemangle(S + 1, Result))
+  if (starts_with(MangledName, '_') &&
+      nonMicrosoftDemangle(MangledName.substr(1), Result))
     return Result;
 
-  if (char *Demangled =
-          microsoftDemangle(S, nullptr, nullptr, nullptr, nullptr)) {
+  if (char *Demangled = microsoftDemangle(MangledName, nullptr, nullptr)) {
     Result = Demangled;
     std::free(Demangled);
-    return Result;
+  } else {
+    Result = MangledName;
   }
+  return Result;
+}
 
-  return MangledName;
+static bool isItaniumEncoding(std::string_view S) {
+  // Itanium encoding requires 1 or 3 leading underscores, followed by 'Z'.
+  return starts_with(S, "_Z") || starts_with(S, "___Z");
 }
 
-bool llvm::nonMicrosoftDemangle(const char *MangledName, std::string &Result) {
+static bool isRustEncoding(std::string_view S) { return starts_with(S, "_R"); }
+
+static bool isDLangEncoding(std::string_view S) { return starts_with(S, "_D"); }
+
+bool llvm::nonMicrosoftDemangle(std::string_view MangledName,
+                                std::string &Result) {
   char *Demangled = nullptr;
   if (isItaniumEncoding(MangledName))
-    Demangled = itaniumDemangle(MangledName, nullptr, nullptr, nullptr);
+    Demangled = itaniumDemangle(MangledName);
   else if (isRustEncoding(MangledName))
     Demangled = rustDemangle(MangledName);
   else if (isDLangEncoding(MangledName))