From 7f9a887d3f64d1227b911c9180767d95dbba4c10 Mon Sep 17 00:00:00 2001
From: Argyrios Kyrtzidis <akyrtzi@gmail.com>
Date: Wed, 28 Aug 2013 01:02:21 +0000
Subject: [PATCH] [BumpPtrAllocator] Move DefaultSlabAllocator to a member of
 BumpPtrAllocator, instead of a static variable.

The problem with having DefaultSlabAllocator being a global static is that it is undefined if BumpPtrAllocator
will be usable during global initialization because it is not guaranteed that DefaultSlabAllocator will be
initialized before BumpPtrAllocator is created and used.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189433 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Support/Allocator.h | 15 +++++++++------
 lib/Support/Allocator.cpp        |  7 ++++---
 2 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/include/llvm/Support/Allocator.h b/include/llvm/Support/Allocator.h
index 3243fd9cea5..397f50fbe36 100644
--- a/include/llvm/Support/Allocator.h
+++ b/include/llvm/Support/Allocator.h
@@ -99,6 +99,9 @@ class BumpPtrAllocator {
   /// allocate a separate slab.
   size_t SizeThreshold;
 
+  /// \brief the default allocator used if one is not provided
+  MallocSlabAllocator DefaultSlabAllocator;
+
   /// Allocator - The underlying allocator we use to get slabs of memory.  This
   /// defaults to MallocSlabAllocator, which wraps malloc, but it could be
   /// changed to use a custom allocator.
@@ -133,12 +136,10 @@ class BumpPtrAllocator {
   /// one.
   void DeallocateSlabs(MemSlab *Slab);
 
-  static MallocSlabAllocator DefaultSlabAllocator;
-
   template<typename T> friend class SpecificBumpPtrAllocator;
 public:
-  BumpPtrAllocator(size_t size = 4096, size_t threshold = 4096,
-                   SlabAllocator &allocator = DefaultSlabAllocator);
+  BumpPtrAllocator(size_t size = 4096, size_t threshold = 4096);
+  BumpPtrAllocator(size_t size, size_t threshold, SlabAllocator &allocator);
   ~BumpPtrAllocator();
 
   /// Reset - Deallocate all but the current slab and reset the current pointer
@@ -189,8 +190,10 @@ template <typename T>
 class SpecificBumpPtrAllocator {
   BumpPtrAllocator Allocator;
 public:
-  SpecificBumpPtrAllocator(size_t size = 4096, size_t threshold = 4096,
-              SlabAllocator &allocator = BumpPtrAllocator::DefaultSlabAllocator)
+  SpecificBumpPtrAllocator(size_t size = 4096, size_t threshold = 4096)
+    : Allocator(size, threshold) {}
+  SpecificBumpPtrAllocator(size_t size, size_t threshold,
+                           SlabAllocator &allocator)
     : Allocator(size, threshold, allocator) {}
 
   ~SpecificBumpPtrAllocator() {
diff --git a/lib/Support/Allocator.cpp b/lib/Support/Allocator.cpp
index 3c4191b805a..6e7a541dd4b 100644
--- a/lib/Support/Allocator.cpp
+++ b/lib/Support/Allocator.cpp
@@ -26,6 +26,10 @@ BumpPtrAllocator::BumpPtrAllocator(size_t size, size_t threshold,
     : SlabSize(size), SizeThreshold(std::min(size, threshold)),
       Allocator(allocator), CurSlab(0), BytesAllocated(0) { }
 
+BumpPtrAllocator::BumpPtrAllocator(size_t size, size_t threshold)
+    : SlabSize(size), SizeThreshold(std::min(size, threshold)),
+      Allocator(DefaultSlabAllocator), CurSlab(0), BytesAllocated(0) { }
+
 BumpPtrAllocator::~BumpPtrAllocator() {
   DeallocateSlabs(CurSlab);
 }
@@ -167,9 +171,6 @@ void BumpPtrAllocator::PrintStats() const {
          << " (includes alignment, etc)\n";
 }
 
-MallocSlabAllocator BumpPtrAllocator::DefaultSlabAllocator =
-  MallocSlabAllocator();
-
 SlabAllocator::~SlabAllocator() { }
 
 MallocSlabAllocator::~MallocSlabAllocator() { }
-- 
2.34.1