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  1. //===- AutoUpgrade.h - AutoUpgrade Helpers ----------------------*- C++ -*-===//
  2. //
  3. // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  4. // See https://llvm.org/LICENSE.txt for license information.
  5. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  6. //
  7. //===----------------------------------------------------------------------===//
  8. //
  9. //  These functions are implemented by lib/IR/AutoUpgrade.cpp.
  10. //
  11. //===----------------------------------------------------------------------===//
  12.  
  13. #ifndef LLVM_IR_AUTOUPGRADE_H
  14. #define LLVM_IR_AUTOUPGRADE_H
  15.  
  16. #include "llvm/ADT/StringRef.h"
  17. #include <vector>
  18.  
  19. namespace llvm {
  20.   class AttrBuilder;
  21.   class CallBase;
  22.   class Constant;
  23.   class Function;
  24.   class Instruction;
  25.   class GlobalVariable;
  26.   class MDNode;
  27.   class Module;
  28.   class StringRef;
  29.   class Type;
  30.   class Value;
  31.  
  32.   template <typename T> class OperandBundleDefT;
  33.   using OperandBundleDef = OperandBundleDefT<Value *>;
  34.  
  35.   /// This is a more granular function that simply checks an intrinsic function
  36.   /// for upgrading, and returns true if it requires upgrading. It may return
  37.   /// null in NewFn if the all calls to the original intrinsic function
  38.   /// should be transformed to non-function-call instructions.
  39.   bool UpgradeIntrinsicFunction(Function *F, Function *&NewFn);
  40.  
  41.   /// This is the complement to the above, replacing a specific call to an
  42.   /// intrinsic function with a call to the specified new function.
  43.   void UpgradeIntrinsicCall(CallBase *CB, Function *NewFn);
  44.  
  45.   // This upgrades the comment for objc retain release markers in inline asm
  46.   // calls
  47.   void UpgradeInlineAsmString(std::string *AsmStr);
  48.  
  49.   /// This is an auto-upgrade hook for any old intrinsic function syntaxes
  50.   /// which need to have both the function updated as well as all calls updated
  51.   /// to the new function. This should only be run in a post-processing fashion
  52.   /// so that it can update all calls to the old function.
  53.   void UpgradeCallsToIntrinsic(Function* F);
  54.  
  55.   /// This checks for global variables which should be upgraded. It it requires
  56.   /// upgrading, returns a pointer to the upgraded variable.
  57.   GlobalVariable *UpgradeGlobalVariable(GlobalVariable *GV);
  58.  
  59.   /// This checks for module flags which should be upgraded. It returns true if
  60.   /// module is modified.
  61.   bool UpgradeModuleFlags(Module &M);
  62.  
  63.   /// Convert calls to ARC runtime functions to intrinsic calls and upgrade the
  64.   /// old retain release marker to new module flag format.
  65.   void UpgradeARCRuntime(Module &M);
  66.  
  67.   void UpgradeSectionAttributes(Module &M);
  68.  
  69.   /// Correct any IR that is relying on old function attribute behavior.
  70.   void UpgradeFunctionAttributes(Function &F);
  71.  
  72.   /// If the given TBAA tag uses the scalar TBAA format, create a new node
  73.   /// corresponding to the upgrade to the struct-path aware TBAA format.
  74.   /// Otherwise return the \p TBAANode itself.
  75.   MDNode *UpgradeTBAANode(MDNode &TBAANode);
  76.  
  77.   /// This is an auto-upgrade for bitcast between pointers with different
  78.   /// address spaces: the instruction is replaced by a pair ptrtoint+inttoptr.
  79.   Instruction *UpgradeBitCastInst(unsigned Opc, Value *V, Type *DestTy,
  80.                                   Instruction *&Temp);
  81.  
  82.   /// This is an auto-upgrade for bitcast constant expression between pointers
  83.   /// with different address spaces: the instruction is replaced by a pair
  84.   /// ptrtoint+inttoptr.
  85.   Constant *UpgradeBitCastExpr(unsigned Opc, Constant *C, Type *DestTy);
  86.  
  87.   /// Check the debug info version number, if it is out-dated, drop the debug
  88.   /// info. Return true if module is modified.
  89.   bool UpgradeDebugInfo(Module &M);
  90.  
  91.   /// Check whether a string looks like an old loop attachment tag.
  92.   inline bool mayBeOldLoopAttachmentTag(StringRef Name) {
  93.     return Name.startswith("llvm.vectorizer.");
  94.   }
  95.  
  96.   /// Upgrade the loop attachment metadata node.
  97.   MDNode *upgradeInstructionLoopAttachment(MDNode &N);
  98.  
  99.   /// Upgrade the datalayout string by adding a section for address space
  100.   /// pointers.
  101.   std::string UpgradeDataLayoutString(StringRef DL, StringRef Triple);
  102.  
  103.   /// Upgrade attributes that changed format or kind.
  104.   void UpgradeAttributes(AttrBuilder &B);
  105.  
  106.   /// Upgrade operand bundles (without knowing about their user instruction).
  107.   void UpgradeOperandBundles(std::vector<OperandBundleDef> &OperandBundles);
  108.  
  109. } // End llvm namespace
  110.  
  111. #endif
  112.