From c265f066971a3df6b0ec546311e63a3efe812e40 Mon Sep 17 00:00:00 2001
From: David Blaikie <dblaikie@gmail.com>
Date: Thu, 2 Jan 2014 19:04:59 +0000
Subject: [PATCH] Make llvm::Regex non-copyable but movable.

Based on a patch by Maciej Piechotka.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198334 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Support/Regex.h    | 14 ++++++++++++++
 lib/Support/Regex.cpp           |  6 ++++--
 unittests/Support/RegexTest.cpp | 15 +++++++++++++++
 3 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/include/llvm/Support/Regex.h b/include/llvm/Support/Regex.h
index 21677dcfa16..5f1031ef361 100644
--- a/include/llvm/Support/Regex.h
+++ b/include/llvm/Support/Regex.h
@@ -17,6 +17,7 @@
 #ifndef LLVM_SUPPORT_REGEX_H
 #define LLVM_SUPPORT_REGEX_H
 
+#include "llvm/Support/Compiler.h"
 #include <string>
 
 struct llvm_regex;
@@ -45,6 +46,19 @@ namespace llvm {
 
     /// Compiles the given regular expression \p Regex.
     Regex(StringRef Regex, unsigned Flags = NoFlags);
+    Regex(const Regex &) LLVM_DELETED_FUNCTION;
+    Regex &operator=(Regex regex) {
+      std::swap(preg, regex.preg);
+      std::swap(error, regex.error);
+      return *this;
+    }
+#if LLVM_HAS_RVALUE_REFERENCES
+    Regex(Regex &&regex) {
+      preg = regex.preg;
+      error = regex.error;
+      regex.preg = NULL;
+    }
+#endif
     ~Regex();
 
     /// isValid - returns the error encountered during regex compilation, or
diff --git a/lib/Support/Regex.cpp b/lib/Support/Regex.cpp
index eb94745d9e3..1115534427c 100644
--- a/lib/Support/Regex.cpp
+++ b/lib/Support/Regex.cpp
@@ -33,8 +33,10 @@ Regex::Regex(StringRef regex, unsigned Flags) {
 }
 
 Regex::~Regex() {
-  llvm_regfree(preg);
-  delete preg;
+  if (preg) {
+    llvm_regfree(preg);
+    delete preg;
+  }
 }
 
 bool Regex::isValid(std::string &Error) {
diff --git a/unittests/Support/RegexTest.cpp b/unittests/Support/RegexTest.cpp
index 30ea2c5b274..c3a8085accd 100644
--- a/unittests/Support/RegexTest.cpp
+++ b/unittests/Support/RegexTest.cpp
@@ -140,4 +140,19 @@ TEST_F(RegexTest, IsValid) {
   EXPECT_EQ("invalid character range", Error);
 }
 
+#if LLVM_HAS_RVALUE_REFERENCES
+TEST_F(RegexTest, MoveConstruct) {
+  Regex r1("^[0-9]+$");
+  Regex r2(std::move(r1));
+  EXPECT_TRUE(r2.match("916"));
+}
+
+TEST_F(RegexTest, MoveAssign) {
+  Regex r1("^[0-9]+$");
+  Regex r2("abc");
+  r2 = std::move(r1);
+  EXPECT_TRUE(r2.match("916"));
+}
+#endif
+
 }
-- 
2.34.1