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Merged
owen-mc merged 2 commits into from
Oct 8, 2026
Merged

Go: Fix database upgrade script #22783

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7a655ec
Fix upgrade script
owen-mc Oct 8, 2026
cf9d757
Remove unnecessary variables
owen-mc Oct 8, 2026
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5 changes: 4 additions & 1 deletion go/ql/lib/upgrades/5ff5325d274ae4f86defa195577bc7c1370b72fa/upgrade.properties
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Original file line number Diff line number Diff line change
@@ -1,2 +1,5 @@
description: Add @rangeelementexpr, grouping the loop variables of a range statement
compatibility: partial
compatibility: full

exprs.rel: run upgrade.qlo new_exprs
has_location.rel: run upgrade.qlo new_has_location
69 changes: 69 additions & 0 deletions go/ql/lib/upgrades/5ff5325d274ae4f86defa195577bc7c1370b72fa/upgrade.ql
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Original file line number Diff line number Diff line change
@@ -0,0 +1,69 @@
class Expr extends @expr {
string toString() { none() }
}

class ExprParent extends @exprparent {
string toString() { none() }
}

class RangeStmt extends @rangestmt {
string toString() { none() }
}

class Location extends @location {
string toString() { none() }
}

newtype TAddedExpr = TRangeElement(RangeStmt stmt)

module Fresh = QlBuiltins::NewEntity<TAddedExpr>;

class TNewExpr = @expr or Fresh::EntityId;

class NewExpr extends TNewExpr {
string toString() { none() }
}

class TNewExprParent = @exprparent or Fresh::EntityId;

class NewExprParent extends TNewExprParent {
string toString() { none() }
}

class TNewLocatable = @locatable or Fresh::EntityId;

class NewLocatable extends TNewLocatable {
string toString() { none() }
}

predicate isRangeElementChild(ExprParent parent, int idx, RangeStmt range) {
parent = range and
idx in [0 .. 1]
}

query predicate new_exprs(NewExpr id, int kind, NewExprParent parent, int idx) {

@michaelnebel michaelnebel Oct 8, 2026

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With the upgrade script, the parent/child relation is expanded
Before

range_stmt ->_0 expr_0
range_stmt ->_1 expr_1

After

range_stm ->_0 range_expression
range_expression ->_0 expr_0
range_expression ->_1 expr_1

Perhaps, a downgrade script is needed as well that contracts the parent/child relation (and deletes the range_expression's).

@owen-mc owen-mc Oct 8, 2026

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That was already done in the original commit.

exists(RangeStmt range |
id = Fresh::map(TRangeElement(range)) and
kind = 55 and
parent = range and
idx = 0
)
or
exists(ExprParent oldParent | exprs(id, kind, oldParent, idx) |
exists(RangeStmt range | isRangeElementChild(oldParent, idx, range) |
parent = Fresh::map(TRangeElement(range))
)
or
not isRangeElementChild(oldParent, idx, _) and
parent = oldParent
)
}

query predicate new_has_location(NewLocatable locatable, Location location) {
has_location(locatable, location)
or
exists(RangeStmt range |
locatable = Fresh::map(TRangeElement(range)) and
has_location(range, location)
)
}
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