2 // IntervalAssumerBase.cs
5 // Alexander Chebaturkin (chebaturkin@gmail.com)
7 // Copyright (C) 2012 Alexander Chebaturkin
9 // Permission is hereby granted, free of charge, to any person obtaining
10 // a copy of this software and associated documentation files (the
11 // "Software"), to deal in the Software without restriction, including
12 // without limitation the rights to use, copy, modify, merge, publish,
13 // distribute, sublicense, and/or sell copies of the Software, and to
14 // permit persons to whom the Software is furnished to do so, subject to
15 // the following conditions:
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
30 using System
.Collections
.Generic
;
32 using Mono
.CodeContracts
.Static
.DataStructures
;
34 namespace Mono
.CodeContracts
.Static
.Analysis
.Numerical
{
35 abstract class IntervalAssumerBase
<TVar
, TExpr
, TInterval
, TNumeric
>
36 where TInterval
: IntervalBase
<TInterval
, TNumeric
>
37 where TVar
: IEquatable
<TVar
> {
38 public virtual IntervalEnvironmentBase
<TVar
, TExpr
, TInterval
, TNumeric
> AssumeEqual
41 IntervalEnvironmentBase
48 var leftVar
= env
.Decoder
.UnderlyingVariable (left
);
49 var rightVar
= env
.Decoder
.UnderlyingVariable (right
);
51 if (env
.Contains (leftVar
)) {
53 var interval
= env
.Eval (left
).Meet (env
.Eval (right
));
55 res
= res
.With (leftVar
, interval
);
56 res
= res
.With (rightVar
, interval
);
61 if (env
.Decoder
.IsConstant (left
) && env
.Decoder
.IsConstant (right
) &&
62 env
.Eval (left
).Meet (env
.Eval (right
)).IsBottom
)
68 public virtual IntervalEnvironmentBase
<TVar
, TExpr
, TInterval
, TNumeric
> AssumeEqualToZero
70 IntervalEnvironmentBase
82 return env
.RefineVariable (var, env
.Context
.Zero
);
85 public virtual IntervalEnvironmentBase
<TVar
, TExpr
, TInterval
, TNumeric
> AssumeNotEqual
88 IntervalEnvironmentBase
97 if (env
.Decoder
.OperatorFor (left
).IsRelational () && env
.Decoder
.IsConstantInt (right
, out value))
98 return value == 0 ? env
.AssumeTrue (left
) : env
.AssumeFalse (left
);
100 var assumer
= env
.Assumer
;
101 return assumer
.AssumeLessThan (left
, right
, env
).Join (assumer
.AssumeLessThan (right
, left
, env
));
104 public abstract IntervalEnvironmentBase
<TVar
, TExpr
, TInterval
, TNumeric
> AssumeLessThan
107 IntervalEnvironmentBase
115 public abstract IntervalEnvironmentBase
<TVar
, TExpr
, TInterval
, TNumeric
> AssumeLessEqualThan
117 TExpr left
, TExpr right
, IntervalEnvironmentBase
<TVar
, TExpr
, TInterval
, TNumeric
> env
);
119 public abstract IntervalEnvironmentBase
<TVar
, TExpr
, TInterval
, TNumeric
> AssumeNotEqualToZero
120 (TVar v
, IntervalEnvironmentBase
<TVar
,TExpr
,TInterval
,TNumeric
> env
);
122 public abstract IntervalEnvironmentBase
<TVar
, TExpr
, TInterval
, TNumeric
> AssumeNotEqualToZero
123 (TExpr e
, IntervalEnvironmentBase
<TVar
,TExpr
,TInterval
,TNumeric
> env
);
125 public abstract IntervalEnvironmentBase
<TVar
, TExpr
, TInterval
, TNumeric
> AssumeLessEqualThan
126 (TInterval intv
, TVar right
, IntervalEnvironmentBase
<TVar
, TExpr
, TInterval
, TNumeric
> env
);
128 public abstract IntervalEnvironmentBase
<TVar
, TExpr
, TInterval
, TNumeric
> AssumeLessThan
129 (TInterval intv
, TVar right
, IntervalEnvironmentBase
<TVar
, TExpr
, TInterval
, TNumeric
> env
);
131 public abstract IntervalEnvironmentBase
<TVar
, TExpr
, TInterval
, TNumeric
> AssumeGreaterEqualThanZero
132 (TExpr expr
, IntervalEnvironmentBase
<TVar
, TExpr
, TInterval
, TNumeric
> env
);
134 protected IntervalEnvironmentBase
<TVar
, TExpr
, TInterval
, TNumeric
> AssumeConstraints
135 (IImmutableMap
<TVar
, Sequence
<TInterval
>> constraints
,
136 IntervalEnvironmentBase
<TVar
, TExpr
, TInterval
, TNumeric
> env
)
139 foreach (var v
in constraints
.Keys
) {
140 var seq
= constraints
[v
];
141 foreach (var intv
in seq
.AsEnumerable ())
142 res
= res
.RefineVariable (v
, intv
);
148 protected IntervalEnvironmentBase
<TVar
, TExpr
, TInterval
, TNumeric
> AssumeConstraints
150 IDictionary
<TVar
, Sequence
<TInterval
>> constraints
,
151 IntervalEnvironmentBase
<TVar
, TExpr
, TInterval
, TNumeric
> env
)
154 foreach (var v
in constraints
.Keys
) {
155 var seq
= constraints
[v
];
156 foreach (var intv
in seq
.AsEnumerable ())
157 res
= res
.RefineVariable (v
, intv
);