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Add bytes lookup lemmas for symbolic immutables #2702

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Add bytes lookup lemmas for symbolic immutables #2702

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4cc162b
Add bytes lookup lemmas
palinatolmach Feb 6, 2025
f8fc873
Merge branch 'master' into add-bytes-lookup-lemmas
palinatolmach Mar 13, 2025
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17 changes: 17 additions & 0 deletions kevm-pyk/src/kevm_pyk/kproj/evm-semantics/lemmas/bytes-simplification.k
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Expand Up @@ -256,6 +256,23 @@ module BYTES-SIMPLIFICATION [symbolic]
requires 0 <=Int S andBool lengthBytes(B1) <=Int S +Int lengthBytes(B2)
[simplification(60)]

// Memory lookup

rule [bytes-concat-lookup-left]:
( B1:Bytes +Bytes B2:Bytes ) [ I:Int ] => B1 [ I ]
requires 0 <=Int I andBool I <Int lengthBytes(B1)
[simplification(40), preserves-definedness]

rule [bytes-concat-lookup-right]:
( B1:Bytes +Bytes B2:Bytes ) [ I:Int ] => B2 [ I -Int lengthBytes(B1) ]
requires lengthBytes(B1) <=Int I
[simplification(40), preserves-definedness]

rule [lookup-as-asWord]:
B:Bytes [ I:Int ] => #asWord ( #range ( B, I, 1 ) )
requires 0 <=Int I andBool I <=Int lengthBytes(B)
[simplification(60)]

// lengthBytes

rule [lengthBytes-geq-zero]: 0 <=Int lengthBytes ( _ ) => true [simplification, smt-lemma]
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