From 1c71a20f32b6c6af85fb26d56b26effe71c710b9 Mon Sep 17 00:00:00 2001
From: Nick Kledzik <kledzik@apple.com>
Date: Tue, 28 Jan 2014 19:21:27 +0000
Subject: Add BumpPtrAllocator::allocateCopy() utilities

Makes it easy to use BumpPtrAllocator to make a copy of StringRef strings.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200331 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Support/Allocator.h | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

(limited to 'include')

diff --git a/include/llvm/Support/Allocator.h b/include/llvm/Support/Allocator.h
index 397f50fbe3..9f7611be02 100644
--- a/include/llvm/Support/Allocator.h
+++ b/include/llvm/Support/Allocator.h
@@ -14,6 +14,8 @@
 #ifndef LLVM_SUPPORT_ALLOCATOR_H
 #define LLVM_SUPPORT_ALLOCATOR_H
 
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/StringRef.h"
 #include "llvm/Support/AlignOf.h"
 #include "llvm/Support/DataTypes.h"
 #include "llvm/Support/MathExtras.h"
@@ -179,6 +181,40 @@ public:
 
   void PrintStats() const;
   
+  
+  /// Allocate space and copy content into it.
+  void *allocateCopy(const void *Src, size_t Size, size_t Alignment=1) {
+    void *P = Allocate(Size, Alignment);
+    memcpy(P, Src, Size);
+    return P;
+  }
+  
+  /// Allocate space for an array of type T, and use std::copy()
+  /// to copy the array contents.
+  template <typename T>
+  typename enable_if<isPodLike<T>, T*>::type
+  allocateCopy(const T Src[], size_t Num) {
+    T *P = Allocate<T>(Num);
+    std::copy(Src, &Src[Num], P);
+    return P;
+  }
+
+  /// Copy a StringRef by allocating copy in BumpPtrAllocator.
+  StringRef allocateCopy(StringRef Str) {
+    size_t Length = Str.size();
+    char *P = allocateCopy<char>(Str.data(), Length);
+    return StringRef(P, Length);
+  }
+
+  /// Copy a ArrayRef<T> by allocating copy in BumpPtrAllocator.
+  template <typename T>
+  typename enable_if<isPodLike<T>, ArrayRef<T>>::type
+  allocateCopy(ArrayRef<T> Src) {
+    size_t Length = Src.size();
+    T *P = allocateCopy(Src.data(), Length*sizeof(T));
+    return makeArrayRef(P, Length);
+  }
+
   /// Compute the total physical memory allocated by this allocator.
   size_t getTotalMemory() const;
 };
-- 
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