[llvm] r240035 - don't repeat function / variable names in comments; NFC

Sanjay Patel spatel at rotateright.com
Thu Jun 18 11:28:20 PDT 2015


Author: spatel
Date: Thu Jun 18 13:28:20 2015
New Revision: 240035

URL: http://llvm.org/viewvc/llvm-project?rev=240035&view=rev
Log:
don't repeat function / variable names in comments; NFC

Modified:
    llvm/trunk/include/llvm/CodeGen/MachineFrameInfo.h

Modified: llvm/trunk/include/llvm/CodeGen/MachineFrameInfo.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/CodeGen/MachineFrameInfo.h?rev=240035&r1=240034&r2=240035&view=diff
==============================================================================
--- llvm/trunk/include/llvm/CodeGen/MachineFrameInfo.h (original)
+++ llvm/trunk/include/llvm/CodeGen/MachineFrameInfo.h Thu Jun 18 13:28:20 2015
@@ -79,9 +79,9 @@ public:
 /// @brief Abstract Stack Frame Information
 class MachineFrameInfo {
 
-  // StackObject - Represent a single object allocated on the stack.
+  // Represent a single object allocated on the stack.
   struct StackObject {
-    // SPOffset - The offset of this object from the stack pointer on entry to
+    // The offset of this object from the stack pointer on entry to
     // the function.  This field has no meaning for a variable sized element.
     int64_t SPOffset;
 
@@ -89,23 +89,23 @@ class MachineFrameInfo {
     // ~0ULL means a dead object.
     uint64_t Size;
 
-    // Alignment - The required alignment of this stack slot.
+    // The required alignment of this stack slot.
     unsigned Alignment;
 
-    // isImmutable - If true, the value of the stack object is set before
+    // If true, the value of the stack object is set before
     // entering the function and is not modified inside the function. By
     // default, fixed objects are immutable unless marked otherwise.
     bool isImmutable;
 
-    // isSpillSlot - If true the stack object is used as spill slot. It
+    // If true the stack object is used as spill slot. It
     // cannot alias any other memory objects.
     bool isSpillSlot;
 
-    /// Alloca - If this stack object is originated from an Alloca instruction
+    /// If this stack object is originated from an Alloca instruction
     /// this value saves the original IR allocation. Can be NULL.
     const AllocaInst *Alloca;
 
-    // PreAllocated - If true, the object was mapped into the local frame
+    // If true, the object was mapped into the local frame
     // block and doesn't need additional handling for allocation beyond that.
     bool PreAllocated;
 
@@ -121,51 +121,47 @@ class MachineFrameInfo {
         isSpillSlot(isSS), Alloca(Val), PreAllocated(false), isAliased(A) {}
   };
 
-  /// StackAlignment - The alignment of the stack.
+  /// The alignment of the stack.
   unsigned StackAlignment;
 
-  /// StackRealignable - Can the stack be realigned.
+  /// Can the stack be realigned.
   bool StackRealignable;
 
-  /// Objects - The list of stack objects allocated...
-  ///
+  /// The list of stack objects allocated.
   std::vector<StackObject> Objects;
 
-  /// NumFixedObjects - This contains the number of fixed objects contained on
+  /// This contains the number of fixed objects contained on
   /// the stack.  Because fixed objects are stored at a negative index in the
   /// Objects list, this is also the index to the 0th object in the list.
-  ///
   unsigned NumFixedObjects;
 
-  /// HasVarSizedObjects - This boolean keeps track of whether any variable
+  /// This boolean keeps track of whether any variable
   /// sized objects have been allocated yet.
-  ///
   bool HasVarSizedObjects;
 
-  /// FrameAddressTaken - This boolean keeps track of whether there is a call
+  /// This boolean keeps track of whether there is a call
   /// to builtin \@llvm.frameaddress.
   bool FrameAddressTaken;
 
-  /// ReturnAddressTaken - This boolean keeps track of whether there is a call
+  /// This boolean keeps track of whether there is a call
   /// to builtin \@llvm.returnaddress.
   bool ReturnAddressTaken;
 
-  /// HasStackMap - This boolean keeps track of whether there is a call
+  /// This boolean keeps track of whether there is a call
   /// to builtin \@llvm.experimental.stackmap.
   bool HasStackMap;
 
-  /// HasPatchPoint - This boolean keeps track of whether there is a call
+  /// This boolean keeps track of whether there is a call
   /// to builtin \@llvm.experimental.patchpoint.
   bool HasPatchPoint;
 
-  /// StackSize - The prolog/epilog code inserter calculates the final stack
+  /// The prolog/epilog code inserter calculates the final stack
   /// offsets for all of the fixed size objects, updating the Objects list
   /// above.  It then updates StackSize to contain the number of bytes that need
   /// to be allocated on entry to the function.
-  ///
   uint64_t StackSize;
 
-  /// OffsetAdjustment - The amount that a frame offset needs to be adjusted to
+  /// The amount that a frame offset needs to be adjusted to
   /// have the actual offset from the stack/frame pointer.  The exact usage of
   /// this is target-dependent, but it is typically used to adjust between
   /// SP-relative and FP-relative offsets.  E.G., if objects are accessed via
@@ -176,52 +172,49 @@ class MachineFrameInfo {
   /// corresponding adjustments are performed directly.
   int OffsetAdjustment;
 
-  /// MaxAlignment - The prolog/epilog code inserter may process objects
-  /// that require greater alignment than the default alignment the target
-  /// provides. To handle this, MaxAlignment is set to the maximum alignment
+  /// The prolog/epilog code inserter may process objects that require greater
+  /// alignment than the default alignment the target provides.
+  /// To handle this, MaxAlignment is set to the maximum alignment
   /// needed by the objects on the current frame.  If this is greater than the
   /// native alignment maintained by the compiler, dynamic alignment code will
   /// be needed.
   ///
   unsigned MaxAlignment;
 
-  /// AdjustsStack - Set to true if this function adjusts the stack -- e.g.,
+  /// Set to true if this function adjusts the stack -- e.g.,
   /// when calling another function. This is only valid during and after
   /// prolog/epilog code insertion.
   bool AdjustsStack;
 
-  /// HasCalls - Set to true if this function has any function calls.
+  /// Set to true if this function has any function calls.
   bool HasCalls;
 
-  /// StackProtectorIdx - The frame index for the stack protector.
+  /// The frame index for the stack protector.
   int StackProtectorIdx;
 
-  /// FunctionContextIdx - The frame index for the function context. Used for
-  /// SjLj exceptions.
+  /// The frame index for the function context. Used for SjLj exceptions.
   int FunctionContextIdx;
 
-  /// MaxCallFrameSize - This contains the size of the largest call frame if the
-  /// target uses frame setup/destroy pseudo instructions (as defined in the
-  /// TargetFrameInfo class).  This information is important for frame pointer
-  /// elimination.  If is only valid during and after prolog/epilog code
-  /// insertion.
-  ///
+  /// This contains the size of the largest call frame if the target uses frame
+  /// setup/destroy pseudo instructions (as defined in the TargetFrameInfo
+  /// class).  This information is important for frame pointer elimination.
+  /// If is only valid during and after prolog/epilog code insertion.
   unsigned MaxCallFrameSize;
 
-  /// CSInfo - The prolog/epilog code inserter fills in this vector with each
+  /// The prolog/epilog code inserter fills in this vector with each
   /// callee saved register saved in the frame.  Beyond its use by the prolog/
   /// epilog code inserter, this data used for debug info and exception
   /// handling.
   std::vector<CalleeSavedInfo> CSInfo;
 
-  /// CSIValid - Has CSInfo been set yet?
+  /// Has CSInfo been set yet?
   bool CSIValid;
 
-  /// LocalFrameObjects - References to frame indices which are mapped
+  /// References to frame indices which are mapped
   /// into the local frame allocation block. <FrameIdx, LocalOffset>
   SmallVector<std::pair<int, int64_t>, 32> LocalFrameObjects;
 
-  /// LocalFrameSize - Size of the pre-allocated local frame block.
+  /// Size of the pre-allocated local frame block.
   int64_t LocalFrameSize;
 
   /// Required alignment of the local object blob, which is the strictest
@@ -284,101 +277,90 @@ public:
     HasTailCall = false;
   }
 
-  /// hasStackObjects - Return true if there are any stack objects in this
-  /// function.
-  ///
+  /// Return true if there are any stack objects in this function.
   bool hasStackObjects() const { return !Objects.empty(); }
 
-  /// hasVarSizedObjects - This method may be called any time after instruction
+  /// This method may be called any time after instruction
   /// selection is complete to determine if the stack frame for this function
   /// contains any variable sized objects.
-  ///
   bool hasVarSizedObjects() const { return HasVarSizedObjects; }
 
-  /// getStackProtectorIndex/setStackProtectorIndex - Return the index for the
-  /// stack protector object.
-  ///
+  /// Return the index for the stack protector object.
   int getStackProtectorIndex() const { return StackProtectorIdx; }
   void setStackProtectorIndex(int I) { StackProtectorIdx = I; }
 
-  /// getFunctionContextIndex/setFunctionContextIndex - Return the index for the
-  /// function context object. This object is used for SjLj exceptions.
+  /// Return the index for the function context object.
+  /// This object is used for SjLj exceptions.
   int getFunctionContextIndex() const { return FunctionContextIdx; }
   void setFunctionContextIndex(int I) { FunctionContextIdx = I; }
 
-  /// isFrameAddressTaken - This method may be called any time after instruction
+  /// This method may be called any time after instruction
   /// selection is complete to determine if there is a call to
   /// \@llvm.frameaddress in this function.
   bool isFrameAddressTaken() const { return FrameAddressTaken; }
   void setFrameAddressIsTaken(bool T) { FrameAddressTaken = T; }
 
-  /// isReturnAddressTaken - This method may be called any time after
+  /// This method may be called any time after
   /// instruction selection is complete to determine if there is a call to
   /// \@llvm.returnaddress in this function.
   bool isReturnAddressTaken() const { return ReturnAddressTaken; }
   void setReturnAddressIsTaken(bool s) { ReturnAddressTaken = s; }
 
-  /// hasStackMap - This method may be called any time after instruction
+  /// This method may be called any time after instruction
   /// selection is complete to determine if there is a call to builtin
   /// \@llvm.experimental.stackmap.
   bool hasStackMap() const { return HasStackMap; }
   void setHasStackMap(bool s = true) { HasStackMap = s; }
 
-  /// hasPatchPoint - This method may be called any time after instruction
+  /// This method may be called any time after instruction
   /// selection is complete to determine if there is a call to builtin
   /// \@llvm.experimental.patchpoint.
   bool hasPatchPoint() const { return HasPatchPoint; }
   void setHasPatchPoint(bool s = true) { HasPatchPoint = s; }
 
-  /// getObjectIndexBegin - Return the minimum frame object index.
-  ///
+  /// Return the minimum frame object index.
   int getObjectIndexBegin() const { return -NumFixedObjects; }
 
-  /// getObjectIndexEnd - Return one past the maximum frame object index.
-  ///
+  /// Return one past the maximum frame object index.
   int getObjectIndexEnd() const { return (int)Objects.size()-NumFixedObjects; }
 
-  /// getNumFixedObjects - Return the number of fixed objects.
+  /// Return the number of fixed objects.
   unsigned getNumFixedObjects() const { return NumFixedObjects; }
 
-  /// getNumObjects - Return the number of objects.
-  ///
+  /// Return the number of objects.
   unsigned getNumObjects() const { return Objects.size(); }
 
-  /// mapLocalFrameObject - Map a frame index into the local object block
+  /// Map a frame index into the local object block
   void mapLocalFrameObject(int ObjectIndex, int64_t Offset) {
     LocalFrameObjects.push_back(std::pair<int, int64_t>(ObjectIndex, Offset));
     Objects[ObjectIndex + NumFixedObjects].PreAllocated = true;
   }
 
-  /// getLocalFrameObjectMap - Get the local offset mapping for a for an object
+  /// Get the local offset mapping for a for an object.
   std::pair<int, int64_t> getLocalFrameObjectMap(int i) {
     assert (i >= 0 && (unsigned)i < LocalFrameObjects.size() &&
             "Invalid local object reference!");
     return LocalFrameObjects[i];
   }
 
-  /// getLocalFrameObjectCount - Return the number of objects allocated into
-  /// the local object block.
+  /// Return the number of objects allocated into the local object block.
   int64_t getLocalFrameObjectCount() { return LocalFrameObjects.size(); }
 
-  /// setLocalFrameSize - Set the size of the local object blob.
+  /// Set the size of the local object blob.
   void setLocalFrameSize(int64_t sz) { LocalFrameSize = sz; }
 
-  /// getLocalFrameSize - Get the size of the local object blob.
+  /// Get the size of the local object blob.
   int64_t getLocalFrameSize() const { return LocalFrameSize; }
 
-  /// setLocalFrameMaxAlign - Required alignment of the local object blob,
+  /// Required alignment of the local object blob,
   /// which is the strictest alignment of any object in it.
   void setLocalFrameMaxAlign(unsigned Align) { LocalFrameMaxAlign = Align; }
 
-  /// getLocalFrameMaxAlign - Return the required alignment of the local
-  /// object blob.
+  /// Return the required alignment of the local object blob.
   unsigned getLocalFrameMaxAlign() const { return LocalFrameMaxAlign; }
 
-  /// getUseLocalStackAllocationBlock - Get whether the local allocation blob
-  /// should be allocated together or let PEI allocate the locals in it
-  /// directly.
+  /// Get whether the local allocation blob should be allocated together or
+  /// let PEI allocate the locals in it directly.
   bool getUseLocalStackAllocationBlock() {return UseLocalStackAllocationBlock;}
 
   /// setUseLocalStackAllocationBlock - Set whether the local allocation blob
@@ -388,30 +370,28 @@ public:
     UseLocalStackAllocationBlock = v;
   }
 
-  /// isObjectPreAllocated - Return true if the object was pre-allocated into
-  /// the local block.
+  /// Return true if the object was pre-allocated into the local block.
   bool isObjectPreAllocated(int ObjectIdx) const {
     assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
            "Invalid Object Idx!");
     return Objects[ObjectIdx+NumFixedObjects].PreAllocated;
   }
 
-  /// getObjectSize - Return the size of the specified object.
-  ///
+  /// Return the size of the specified object.
   int64_t getObjectSize(int ObjectIdx) const {
     assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
            "Invalid Object Idx!");
     return Objects[ObjectIdx+NumFixedObjects].Size;
   }
 
-  /// setObjectSize - Change the size of the specified stack object.
+  /// Change the size of the specified stack object.
   void setObjectSize(int ObjectIdx, int64_t Size) {
     assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
            "Invalid Object Idx!");
     Objects[ObjectIdx+NumFixedObjects].Size = Size;
   }
 
-  /// getObjectAlignment - Return the alignment of the specified stack object.
+  /// Return the alignment of the specified stack object.
   unsigned getObjectAlignment(int ObjectIdx) const {
     assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
            "Invalid Object Idx!");
@@ -426,7 +406,7 @@ public:
     ensureMaxAlignment(Align);
   }
 
-  /// getObjectAllocation - Return the underlying Alloca of the specified
+  /// Return the underlying Alloca of the specified
   /// stack object if it exists. Returns 0 if none exists.
   const AllocaInst* getObjectAllocation(int ObjectIdx) const {
     assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
@@ -434,9 +414,8 @@ public:
     return Objects[ObjectIdx+NumFixedObjects].Alloca;
   }
 
-  /// getObjectOffset - Return the assigned stack offset of the specified object
+  /// Return the assigned stack offset of the specified object
   /// from the incoming stack pointer.
-  ///
   int64_t getObjectOffset(int ObjectIdx) const {
     assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
            "Invalid Object Idx!");
@@ -445,9 +424,8 @@ public:
     return Objects[ObjectIdx+NumFixedObjects].SPOffset;
   }
 
-  /// setObjectOffset - Set the stack frame offset of the specified object.  The
+  /// Set the stack frame offset of the specified object. The
   /// offset is relative to the stack pointer on entry to the function.
-  ///
   void setObjectOffset(int ObjectIdx, int64_t SPOffset) {
     assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
            "Invalid Object Idx!");
@@ -456,44 +434,37 @@ public:
     Objects[ObjectIdx+NumFixedObjects].SPOffset = SPOffset;
   }
 
-  /// getStackSize - Return the number of bytes that must be allocated to hold
+  /// Return the number of bytes that must be allocated to hold
   /// all of the fixed size frame objects.  This is only valid after
   /// Prolog/Epilog code insertion has finalized the stack frame layout.
-  ///
   uint64_t getStackSize() const { return StackSize; }
 
-  /// setStackSize - Set the size of the stack...
-  ///
+  /// Set the size of the stack.
   void setStackSize(uint64_t Size) { StackSize = Size; }
 
   /// Estimate and return the size of the stack frame.
   unsigned estimateStackSize(const MachineFunction &MF) const;
 
-  /// getOffsetAdjustment - Return the correction for frame offsets.
-  ///
+  /// Return the correction for frame offsets.
   int getOffsetAdjustment() const { return OffsetAdjustment; }
 
-  /// setOffsetAdjustment - Set the correction for frame offsets.
-  ///
+  /// Set the correction for frame offsets.
   void setOffsetAdjustment(int Adj) { OffsetAdjustment = Adj; }
 
-  /// getMaxAlignment - Return the alignment in bytes that this function must be
-  /// aligned to, which is greater than the default stack alignment provided by
-  /// the target.
-  ///
+  /// Return the alignment in bytes that this function must be aligned to,
+  /// which is greater than the default stack alignment provided by the target.
   unsigned getMaxAlignment() const { return MaxAlignment; }
 
-  /// ensureMaxAlignment - Make sure the function is at least Align bytes
-  /// aligned.
+  /// Make sure the function is at least Align bytes aligned.
   void ensureMaxAlignment(unsigned Align);
 
-  /// AdjustsStack - Return true if this function adjusts the stack -- e.g.,
+  /// Return true if this function adjusts the stack -- e.g.,
   /// when calling another function. This is only valid during and after
   /// prolog/epilog code insertion.
   bool adjustsStack() const { return AdjustsStack; }
   void setAdjustsStack(bool V) { AdjustsStack = V; }
 
-  /// hasCalls - Return true if the current function has any function calls.
+  /// Return true if the current function has any function calls.
   bool hasCalls() const { return HasCalls; }
   void setHasCalls(bool V) { HasCalls = V; }
 
@@ -513,7 +484,7 @@ public:
   bool hasTailCall() const { return HasTailCall; }
   void setHasTailCall() { HasTailCall = true; }
 
-  /// getMaxCallFrameSize - Return the maximum size of a call frame that must be
+  /// Return the maximum size of a call frame that must be
   /// allocated for an outgoing function call.  This is only available if
   /// CallFrameSetup/Destroy pseudo instructions are used by the target, and
   /// then only during or after prolog/epilog code insertion.
@@ -521,25 +492,23 @@ public:
   unsigned getMaxCallFrameSize() const { return MaxCallFrameSize; }
   void setMaxCallFrameSize(unsigned S) { MaxCallFrameSize = S; }
 
-  /// CreateFixedObject - Create a new object at a fixed location on the stack.
+  /// Create a new object at a fixed location on the stack.
   /// All fixed objects should be created before other objects are created for
   /// efficiency. By default, fixed objects are not pointed to by LLVM IR
   /// values. This returns an index with a negative value.
-  ///
   int CreateFixedObject(uint64_t Size, int64_t SPOffset, bool Immutable,
                         bool isAliased = false);
 
-  /// CreateFixedSpillStackObject - Create a spill slot at a fixed location
-  /// on the stack.  Returns an index with a negative value.
+  /// Create a spill slot at a fixed location on the stack.
+  /// Returns an index with a negative value.
   int CreateFixedSpillStackObject(uint64_t Size, int64_t SPOffset);
 
-  /// isFixedObjectIndex - Returns true if the specified index corresponds to a
-  /// fixed stack object.
+  /// Returns true if the specified index corresponds to a fixed stack object.
   bool isFixedObjectIndex(int ObjectIdx) const {
     return ObjectIdx < 0 && (ObjectIdx >= -(int)NumFixedObjects);
   }
 
-  /// isAliasedObjectIndex - Returns true if the specified index corresponds
+  /// Returns true if the specified index corresponds
   /// to an object that might be pointed to by an LLVM IR value.
   bool isAliasedObjectIndex(int ObjectIdx) const {
     assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
@@ -558,61 +527,52 @@ public:
     return Objects[ObjectIdx+NumFixedObjects].isImmutable;
   }
 
-  /// isSpillSlotObjectIndex - Returns true if the specified index corresponds
-  /// to a spill slot..
+  /// Returns true if the specified index corresponds to a spill slot.
   bool isSpillSlotObjectIndex(int ObjectIdx) const {
     assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
            "Invalid Object Idx!");
     return Objects[ObjectIdx+NumFixedObjects].isSpillSlot;
   }
 
-  /// isDeadObjectIndex - Returns true if the specified index corresponds to
-  /// a dead object.
+  /// Returns true if the specified index corresponds to a dead object.
   bool isDeadObjectIndex(int ObjectIdx) const {
     assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
            "Invalid Object Idx!");
     return Objects[ObjectIdx+NumFixedObjects].Size == ~0ULL;
   }
 
-  /// CreateStackObject - Create a new statically sized stack object, returning
+  /// Create a new statically sized stack object, returning
   /// a nonnegative identifier to represent it.
-  ///
   int CreateStackObject(uint64_t Size, unsigned Alignment, bool isSS,
                         const AllocaInst *Alloca = nullptr);
 
-  /// CreateSpillStackObject - Create a new statically sized stack object that
-  /// represents a spill slot, returning a nonnegative identifier to represent
-  /// it.
-  ///
+  /// Create a new statically sized stack object that represents a spill slot,
+  /// returning a nonnegative identifier to represent it.
   int CreateSpillStackObject(uint64_t Size, unsigned Alignment);
 
-  /// RemoveStackObject - Remove or mark dead a statically sized stack object.
-  ///
+  /// Remove or mark dead a statically sized stack object.
   void RemoveStackObject(int ObjectIdx) {
     // Mark it dead.
     Objects[ObjectIdx+NumFixedObjects].Size = ~0ULL;
   }
 
-  /// CreateVariableSizedObject - Notify the MachineFrameInfo object that a
-  /// variable sized object has been created.  This must be created whenever a
-  /// variable sized object is created, whether or not the index returned is
-  /// actually used.
-  ///
+  /// Notify the MachineFrameInfo object that a variable sized object has been
+  /// created.  This must be created whenever a variable sized object is
+  /// created, whether or not the index returned is actually used.
   int CreateVariableSizedObject(unsigned Alignment, const AllocaInst *Alloca);
 
-  /// getCalleeSavedInfo - Returns a reference to call saved info vector for the
-  /// current function.
+  /// Returns a reference to call saved info vector for the current function.
   const std::vector<CalleeSavedInfo> &getCalleeSavedInfo() const {
     return CSInfo;
   }
 
-  /// setCalleeSavedInfo - Used by prolog/epilog inserter to set the function's
-  /// callee saved information.
+  /// Used by prolog/epilog inserter to set the function's callee saved
+  /// information.
   void setCalleeSavedInfo(const std::vector<CalleeSavedInfo> &CSI) {
     CSInfo = CSI;
   }
 
-  /// isCalleeSavedInfoValid - Has the callee saved info been calculated yet?
+  /// Has the callee saved info been calculated yet?
   bool isCalleeSavedInfoValid() const { return CSIValid; }
 
   void setCalleeSavedInfoValid(bool v) { CSIValid = v; }
@@ -632,9 +592,8 @@ public:
   /// method always returns an empty set.
   BitVector getPristineRegs(const MachineFunction &MF) const;
 
-  /// print - Used by the MachineFunction printer to print information about
-  /// stack objects. Implemented in MachineFunction.cpp
-  ///
+  /// Used by the MachineFunction printer to print information about
+  /// stack objects. Implemented in MachineFunction.cpp.
   void print(const MachineFunction &MF, raw_ostream &OS) const;
 
   /// dump - Print the function to stderr.





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