LLVM  10.0.0svn
GuardUtils.h
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1 //===-- GuardUtils.h - Utils for work with guards ---------------*- 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 // Utils that are used to perform analyzes related to guards and their
9 // conditions.
10 //===----------------------------------------------------------------------===//
11 
12 #ifndef LLVM_ANALYSIS_GUARDUTILS_H
13 #define LLVM_ANALYSIS_GUARDUTILS_H
14 
15 namespace llvm {
16 
17 class BasicBlock;
18 class User;
19 class Value;
20 
21 /// Returns true iff \p U has semantics of a guard expressed in a form of call
22 /// of llvm.experimental.guard intrinsic.
23 bool isGuard(const User *U);
24 
25 /// Returns true iff \p U has semantics of a guard expressed in a form of a
26 /// widenable conditional branch to deopt block.
27 bool isGuardAsWidenableBranch(const User *U);
28 
29 /// If U is widenable branch looking like:
30 /// %cond = ...
31 /// %wc = call i1 @llvm.experimental.widenable.condition()
32 /// %branch_cond = and i1 %cond, %wc
33 /// br i1 %branch_cond, label %if_true_bb, label %if_false_bb ; <--- U
34 /// The function returns true, and the values %cond and %wc and blocks
35 /// %if_true_bb, if_false_bb are returned in
36 /// the parameters (Condition, WidenableCondition, IfTrueBB and IfFalseFF)
37 /// respectively. If \p U does not match this pattern, return false.
38 bool parseWidenableBranch(const User *U, Value *&Condition,
39  Value *&WidenableCondition, BasicBlock *&IfTrueBB,
40  BasicBlock *&IfFalseBB);
41 
42 } // llvm
43 
44 #endif // LLVM_ANALYSIS_GUARDUTILS_H
This class represents lattice values for constants.
Definition: AllocatorList.h:23
Various leaf nodes.
Definition: ISDOpcodes.h:59
bool parseWidenableBranch(const User *U, Value *&Condition, Value *&WidenableCondition, BasicBlock *&IfTrueBB, BasicBlock *&IfFalseBB)
If U is widenable branch looking like: cond = ...
Definition: GuardUtils.cpp:38
bool isGuard(const User *U)
Returns true iff U has semantics of a guard expressed in a form of call of llvm.experimental.guard intrinsic.
Definition: GuardUtils.cpp:17
could "use" a pointer
bool isGuardAsWidenableBranch(const User *U)
Returns true iff U has semantics of a guard expressed in a form of a widenable conditional branch to ...
Definition: GuardUtils.cpp:22