include/llvm/Analysis/CFLAliasAnalysisUtils.h

   1 //=- CFLAliasAnalysisUtils.h - Utilities for CFL Alias Analysis ----*- 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 // \file
   9 // These are the utilities/helpers used by the CFL Alias Analyses available in
  10 // tree, i.e. Steensgaard's and Andersens'.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_ANALYSIS_CFLALIASANALYSISUTILS_H
  15 #define LLVM_ANALYSIS_CFLALIASANALYSISUTILS_H
  16
  17 #include "llvm/IR/Function.h"
  18 #include "llvm/IR/ValueHandle.h"
  19
  20 namespace llvm {
  21 namespace cflaa {
  22
  23 template <typename AAResult> struct FunctionHandle final : public CallbackVH {
  24   FunctionHandle(Function *Fn, AAResult *Result)
  25       : CallbackVH(Fn), Result(Result) {
  26     assert(Fn != nullptr);
  27     assert(Result != nullptr);
  28   }
  29
  30   void deleted() override { removeSelfFromCache(); }
  31   void allUsesReplacedWith(Value *) override { removeSelfFromCache(); }
  32
  33 private:
  34   AAResult *Result;
  35
  36   void removeSelfFromCache() {
  37     assert(Result != nullptr);
  38     auto *Val = getValPtr();
  39     Result->evict(cast<Function>(Val));
  40     setValPtr(nullptr);
  41   }
  42 };
  43
  44 static inline const Function *parentFunctionOfValue(const Value *Val) {
  45   if (auto *Inst = dyn_cast<Instruction>(Val)) {
  46     auto *Bb = Inst->getParent();
  47     return Bb->getParent();
  48   }
  49
  50   if (auto *Arg = dyn_cast<Argument>(Val))
  51     return Arg->getParent();
  52   return nullptr;
  53 } // namespace cflaa
  54 } // namespace llvm
  55 }
  56
  57 #endif // LLVM_ANALYSIS_CFLALIASANALYSISUTILS_H