Revert r251050 to fix miscompile when running Clang -O1

[oota-llvm.git] / include / llvm / Analysis / CaptureTracking.h

diff --git a/include/llvm/Analysis/CaptureTracking.h b/include/llvm/Analysis/CaptureTracking.h
index eccf1f811381485f242d343f01b3a726b1597296..8d2c095d8585f57df92a33ab463d3e74711a27cf 100644 (file)
--- a/include/llvm/Analysis/CaptureTracking.h
+++ b/include/llvm/Analysis/CaptureTracking.h
@@ -18,6 +18,9 @@ namespace llvm {
 
   class Value;
   class Use;
+  class Instruction;
+  class DominatorTree;
+  class OrderedBasicBlock;
 
   /// PointerMayBeCaptured - Return true if this pointer value may be captured
   /// by the enclosing function (which is required to exist).  This routine can
@@ -30,6 +33,22 @@ namespace llvm {
                             bool ReturnCaptures,
                             bool StoreCaptures);
 
+  /// PointerMayBeCapturedBefore - Return true if this pointer value may be
+  /// captured by the enclosing function (which is required to exist). If a
+  /// DominatorTree is provided, only captures which happen before the given
+  /// instruction are considered. This routine can be expensive, so consider
+  /// caching the results.  The boolean ReturnCaptures specifies whether
+  /// returning the value (or part of it) from the function counts as capturing
+  /// it or not.  The boolean StoreCaptures specified whether storing the value
+  /// (or part of it) into memory anywhere automatically counts as capturing it
+  /// or not. Captures by the provided instruction are considered if the
+  /// final parameter is true. An ordered basic block in \p OBB could be used
+  /// to speed up capture-tracker queries.
+  bool PointerMayBeCapturedBefore(const Value *V, bool ReturnCaptures,
+                                  bool StoreCaptures, const Instruction *I,
+                                  DominatorTree *DT, bool IncludeI = false,
+                                  OrderedBasicBlock *OBB = nullptr);
+
   /// This callback is used in conjunction with PointerMayBeCaptured. In
   /// addition to the interface here, you'll need to provide your own getters
   /// to see whether anything was captured.