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| 14 | pmbaty | 1 | //===- ReplaceConstant.h - Replacing LLVM constant expressions --*- C++ -*-===// |
| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file declares the utility function for replacing LLVM constant |
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| 10 | // expressions by instructions. |
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| 11 | // |
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| 12 | //===----------------------------------------------------------------------===// |
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| 13 | |||
| 14 | #ifndef LLVM_IR_REPLACECONSTANT_H |
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| 15 | #define LLVM_IR_REPLACECONSTANT_H |
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| 16 | |||
| 17 | #include <map> |
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| 18 | #include <vector> |
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| 19 | |||
| 20 | namespace llvm { |
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| 21 | |||
| 22 | class ConstantExpr; |
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| 23 | class Instruction; |
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| 24 | class Use; |
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| 25 | template <typename PtrType> class SmallPtrSetImpl; |
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| 26 | |||
| 27 | /// The given instruction \p I contains given constant expression \p CE as one |
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| 28 | /// of its operands, possibly nested within constant expression trees. Convert |
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| 29 | /// all reachable paths from contant expression operands of \p I to \p CE into |
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| 30 | /// corresponding instructions, insert them before \p I, update operands of \p I |
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| 31 | /// accordingly, and if required, return all such converted instructions at |
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| 32 | /// \p Insts. |
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| 33 | void convertConstantExprsToInstructions( |
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| 34 | Instruction *I, ConstantExpr *CE, |
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| 35 | SmallPtrSetImpl<Instruction *> *Insts = nullptr); |
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| 36 | |||
| 37 | /// The given instruction \p I contains constant expression CE within the |
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| 38 | /// constant expression trees of it`s constant expression operands, and |
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| 39 | /// \p CEPaths holds all the reachable paths (to CE) from such constant |
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| 40 | /// expression trees of \p I. Convert constant expressions within these paths |
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| 41 | /// into corresponding instructions, insert them before \p I, update operands of |
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| 42 | /// \p I accordingly, and if required, return all such converted instructions at |
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| 43 | /// \p Insts. |
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| 44 | void convertConstantExprsToInstructions( |
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| 45 | Instruction *I, |
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| 46 | std::map<Use *, std::vector<std::vector<ConstantExpr *>>> &CEPaths, |
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| 47 | SmallPtrSetImpl<Instruction *> *Insts = nullptr); |
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| 48 | |||
| 49 | /// Given an instruction \p I which uses given constant expression \p CE as |
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| 50 | /// operand, either directly or nested within other constant expressions, return |
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| 51 | /// all reachable paths from the constant expression operands of \p I to \p CE, |
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| 52 | /// and return collected paths at \p CEPaths. |
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| 53 | void collectConstantExprPaths( |
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| 54 | Instruction *I, ConstantExpr *CE, |
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| 55 | std::map<Use *, std::vector<std::vector<ConstantExpr *>>> &CEPaths); |
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| 56 | |||
| 57 | } // end namespace llvm |
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| 58 | |||
| 59 | #endif // LLVM_IR_REPLACECONSTANT_H |