[PATCH] D54486: BumpPtrAllocator: Add a couple of fancy wrapper methods around identifyObject().

[Phabricator via Phabricator via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rL348197: BumpPtrAllocator: Add a couple of convenient wrappers around identifyObject(). (authored by dergachev, committed by ).

Changed prior to commit:
  https://reviews.llvm.org/D54486?vs=176469&id=176475#toc

Repository:
  rL LLVM

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D54486/new/

https://reviews.llvm.org/D54486

Files:
  llvm/trunk/include/llvm/Support/Allocator.h


Index: llvm/trunk/include/llvm/Support/Allocator.h
===================================================================
--- llvm/trunk/include/llvm/Support/Allocator.h
+++ llvm/trunk/include/llvm/Support/Allocator.h
@@ -311,6 +311,33 @@
     return None;
   }
 
+  /// A wrapper around identifyObject that additionally asserts that
+  /// the object is indeed within the allocator.
+  /// \return An index uniquely and reproducibly identifying
+  /// an input pointer \p Ptr in the given allocator.
+  int64_t identifyKnownObject(const void *Ptr) {
+    Optional<int64_t> Out = identifyObject(Ptr);
+    assert(Out && "Wrong allocator used");
+    return *Out;
+  }
+
+  /// A wrapper around identifyKnownObject. Accepts type information
+  /// about the object and produces a smaller identifier by relying on
+  /// the alignment information. Note that sub-classes may have different
+  /// alignment, so the most base class should be passed as template parameter
+  /// in order to obtain correct results. For that reason automatic template
+  /// parameter deduction is disabled.
+  /// \return An index uniquely and reproducibly identifying
+  /// an input pointer \p Ptr in the given allocator. This identifier is
+  /// different from the ones produced by identifyObject and
+  /// identifyAlignedObject.
+  template <typename T>
+  int64_t identifyKnownAlignedObject(const void *Ptr) {
+    int64_t Out = identifyKnownObject(Ptr);
+    assert(Out % alignof(T) == 0 && "Wrong alignment information");
+    return Out / alignof(T);
+  }
+
   size_t getTotalMemory() const {
     size_t TotalMemory = 0;
     for (auto I = Slabs.begin(), E = Slabs.end(); I != E; ++I)


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D54486.176475.patch
Type: text/x-patch
Size: 1671 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20181203/96773555/attachment.bin>