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implemented 'guard' annotation

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This commit is contained in:
Araq 2014-09-21 18:39:00 +02:00
commit 7916b1f9aa
21 changed files with 267 additions and 123 deletions
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16
compiler/guards.nim
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@ -838,6 +838,22 @@ proc addAsgnFact*(m: var TModel, key, value: PNode) =
fact.sons[2] = value
m.add fact
proc sameSubexprs*(m: TModel; a, b: PNode): bool =
# This should be used to check whether two *path expressions* refer to the
# same memory location according to 'm'. This is tricky:
# lock a[i].guard:
# ...
# access a[i].guarded
#
# Here a[i] is the same as a[i] iff 'i' and 'a' are not changed via '...'.
# However, nil checking requires exactly the same mechanism! But for now
# we simply use sameTree and live with the unsoundness of the analysis.
var check = newNodeI(nkCall, a.info, 3)
check.sons[0] = newSymNode(opEq)
check.sons[1] = a
check.sons[2] = b
result = m.doesImply(check) == impYes
proc addCaseBranchFacts*(m: var TModel, n: PNode, i: int) =
let branch = n.sons[i]
if branch.kind == nkOfBranch: