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Havoc scoped variables explicitly #468

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0201d59
Havoc scoped variables explicitly
gauravpartha Sep 15, 2023
1e40bcb
adjust silver commit (ignore array_quick_select.vpr test)
gauravpartha Sep 15, 2023
7359098
update silver submodule
gauravpartha Sep 15, 2023
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2 changes: 1 addition & 1 deletion silver
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Submodule silver updated 1 files
+1 −0 src/test/resources/examples/quickselect/arrays_quickselect_rec.vpr
4 changes: 3 additions & 1 deletion src/main/scala/viper/carbon/modules/impls/DefaultStmtModule.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -253,9 +253,11 @@ class DefaultStmtModule(val verifier: Verifier) extends StmtModule with SimpleSt
case sil.Seqn(ss, scopedDecls) =>
val locals = scopedDecls.collect {case l: sil.LocalVarDecl => l}
locals map (v => mainModule.env.define(v.localVar)) // add local variables to environment
val s =
val s = {
MaybeCommentBlock("Havoc scoped variables", locals map (lv => Havoc(mainModule.env.get(lv.localVar)))) ++
MaybeCommentBlock("Assumptions about local variables", locals map (a => mainModule.allAssumptionsAboutValue(a.typ, mainModule.translateLocalVarDecl(a), true))) ++
Seqn(ss map (st => translateStmt(st, statesStack, allStateAssms, duringPackage)))
}
locals map (v => mainModule.env.undefine(v.localVar)) // remove local variables from environment
// return to avoid adding a comment, and to avoid the extra 'assumeGoodState'
return s
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