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Posted to notifications@groovy.apache.org by "Eric Milles (JIRA)" <ji...@apache.org> on 2019/04/04 16:38:00 UTC
[jira] [Comment Edited] (GROOVY-9064) STC: explicit declared
variable type ignored in favor of assigned value type(s)
[ https://issues.apache.org/jira/browse/GROOVY-9064?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16810046#comment-16810046 ]
Eric Milles edited comment on GROOVY-9064 at 4/4/19 4:37 PM:
-------------------------------------------------------------
In order to maintain the declared type in the face of conditional assignments, like this:
{code:groovy}
@groovy.transform.CompileStatic
void meth() {
Map map = getMapFromSomewhere()
if (!map) {
map = [a:1, b:'2']
}
// map infers to LinkedHashMap<String, Serializable<?>> without extra guard condition
}
{code}
A guard condition also needs to be added to {{StaticTypeCheckingVisitor.popAssignmentTracking}}.
{code:java}
protected Map<VariableExpression, ClassNode> popAssignmentTracking(final Map<VariableExpression, List<ClassNode>> oldTracker) {
Map<VariableExpression, ClassNode> assignments = new HashMap<VariableExpression, ClassNode>();
if (!typeCheckingContext.ifElseForWhileAssignmentTracker.isEmpty()) {
for (Map.Entry<VariableExpression, List<ClassNode>> entry : typeCheckingContext.ifElseForWhileAssignmentTracker.entrySet()) {
VariableExpression key = entry.getKey();
List<ClassNode> allValues = entry.getValue();
// GROOVY-6099: First element of the list may be null, if no assignment was made before the branch
List<ClassNode> nonNullValues = new ArrayList<ClassNode>(allValues.size());
for (ClassNode value : allValues) {
if (value != null) nonNullValues.add(value);
}
ClassNode cn = lowestUpperBound(nonNullValues);
// GRECLIPSE add
if (key.isDynamicTyped())
// GRECLIPSE end
storeType(key, cn);
assignments.put(key, cn);
}
}
typeCheckingContext.ifElseForWhileAssignmentTracker = oldTracker;
return assignments;
}
{code}
was (Author: emilles):
In order to maintain the declared type in the face of conditional assignments, like this:
{code:groovy}
@groovy.transform.CompileStatic
void meth() {
Map map = getMapFromSomewhere()
if (!map) {
map = [a:1, b:'2']
}
// map infers to LinkedHashMap<String, Serializable<?>> without extra guard condition
}
{code}
A guard condition also needs to be added to {{StaticTypeCheckingVisitor.popAssignmentTracking}}.
{code:java}
protected Map<VariableExpression, ClassNode> popAssignmentTracking(final Map<VariableExpression, List<ClassNode>> oldTracker) {
Map<VariableExpression, ClassNode> assignments = new HashMap<VariableExpression, ClassNode>();
if (!typeCheckingContext.ifElseForWhileAssignmentTracker.isEmpty()) {
for (Map.Entry<VariableExpression, List<ClassNode>> entry : typeCheckingContext.ifElseForWhileAssignmentTracker.entrySet()) {
VariableExpression key = entry.getKey();
List<ClassNode> allValues = entry.getValue();
// GROOVY-6099: First element of the list may be null, if no assignment was made before the branch
List<ClassNode> nonNullValues = new ArrayList<ClassNode>(allValues.size());
for (ClassNode value : allValues) {
if (value != null) nonNullValues.add(value);
}
ClassNode cn = lowestUpperBound(nonNullValues);
// GRECLIPSE add -- GROOVY-9064
if (key.isDynamicTyped())
// GRECLIPSE end
storeType(key, cn);
assignments.put(key, cn);
}
}
typeCheckingContext.ifElseForWhileAssignmentTracker = oldTracker;
return assignments;
}
{code}
> STC: explicit declared variable type ignored in favor of assigned value type(s)
> -------------------------------------------------------------------------------
>
> Key: GROOVY-9064
> URL: https://issues.apache.org/jira/browse/GROOVY-9064
> Project: Groovy
> Issue Type: Bug
> Reporter: Eric Milles
> Priority: Major
>
> Follow up to GROOVY-9058. Consider the following:
> {code:groovy}
> List getSomeRows() { ... }
> @groovy.transform.CompileStatic
> void meth() {
> List<Object[]> rows = getSomeRows()
> rows.each { row ->
> def col = row[0]
> }
> }
> {code}
> The inferred type of {{rows}} is {{List}} and not {{List<Object[]>}} even though the assignment cleared type checking. This causes the inferred type of {{row}} to be {{Object}} instead of {{Object[]}}.
> Similarly, {{List<String> list = []}} infers as {{ArrayList<String>}} instead of the explicit declared type, and {{Map<String, ?> map = [:]}} infers to {{LinkedHasMap<...>}} instead of the declared type. In general, I think as long as the assignment is compatible, the variable should retain its explicitly declared type regardless of assignments.
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