The TargetData is not used for the isPowerOfTwo determination. It has never

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

diff --git a/include/llvm/Analysis/CaptureTracking.h b/include/llvm/Analysis/CaptureTracking.h
index a0ff503a03934e087f41d392378e0c73df85be36..6ebe2d77beb35035e77977bb5bee67b46f4147f7 100644 (file)
--- a/include/llvm/Analysis/CaptureTracking.h
+++ b/include/llvm/Analysis/CaptureTracking.h
@@ -14,16 +14,50 @@
 #ifndef LLVM_ANALYSIS_CAPTURETRACKING_H
 #define LLVM_ANALYSIS_CAPTURETRACKING_H
 
-namespace llvm {
-  class Value;
+#include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm/Constants.h"
+#include "llvm/Instructions.h"
+#include "llvm/Support/CallSite.h"
 
+namespace llvm {
   /// PointerMayBeCaptured - Return true if this pointer value may be captured
   /// by the enclosing function (which is required to exist).  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.
-  bool PointerMayBeCaptured(const Value *V, bool ReturnCaptures);
+  /// 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.
+  bool PointerMayBeCaptured(const Value *V,
+                            bool ReturnCaptures,
+                            bool StoreCaptures);
+
+  /// 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.
+  struct CaptureTracker {
+    virtual ~CaptureTracker();
+
+    /// tooManyUses - The depth of traversal has breached a limit. There may be
+    /// capturing instructions that will not be passed into captured().
+    virtual void tooManyUses() = 0;
+
+    /// shouldExplore - This is the use of a value derived from the pointer.
+    /// To prune the search (ie., assume that none of its users could possibly
+    /// capture) return false. To search it, return true.
+    ///
+    /// U->getUser() is always an Instruction.
+    virtual bool shouldExplore(Use *U);
+
+    /// captured - Information about the pointer was captured by the user of
+    /// use U. Return true to stop the traversal or false to continue looking
+    /// for more capturing instructions.
+    virtual bool captured(Use *U) = 0;
+  };
 
+  /// PointerMayBeCaptured - Visit the value and the values derived from it and
+  /// find values which appear to be capturing the pointer value. This feeds
+  /// results into and is controlled by the CaptureTracker object.
+  void PointerMayBeCaptured(const Value *V, CaptureTracker *Tracker);
 } // end namespace llvm
 
 #endif