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 {
FunctionHandlefinal24   FunctionHandle(Function *Fn, AAResult *Result)
25       : CallbackVH(Fn), Result(Result) {
26     assert(Fn != nullptr);
27     assert(Result != nullptr);
28   }
29 
deletedfinal30   void deleted() override { removeSelfFromCache(); }
allUsesReplacedWithfinal31   void allUsesReplacedWith(Value *) override { removeSelfFromCache(); }
32 
33 private:
34   AAResult *Result;
35 
removeSelfFromCachefinal36   void removeSelfFromCache() {
37     assert(Result != nullptr);
38     auto *Val = getValPtr();
39     Result->evict(cast<Function>(Val));
40     setValPtr(nullptr);
41   }
42 };
43 
parentFunctionOfValue(const Value * Val)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
58