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…ile is being parsed AnnotatedTypeFactory.getDeclAnnotations returns early, without caching, while any annotation file is being parsed, including the ajava file for the file currently being type-checked. Two callers that cache results derived from declaration annotations tested only stubTypes and ajavaTypes, and not currentFileAjavaTypes, so a result computed while that file was being parsed could be cached even though it was missing annotations. currentFileAjavaTypes is protected, so a class outside AnnotatedTypeFactory could not consult it. Add AnnotatedTypeFactory.isParsingAnnotationFiles, which holds the complete condition, and use it at the two guards in AnnotatedTypeFactory as well as in QualifierDefaults and DefaultQualifierForUseTypeAnnotator.
…other defaults Field elementDefaults served two purposes: it held the defaults that a type system had declared for an element through addElementDefault, and it also memoized the merged results of defaultsAt. Split it into elementDeclaredDefaults and defaultsAtCache. Because the two purposes shared one field, defaultsAt consulted the field before looking at the element's own @DefaultQualifier annotation and before walking the enclosing scopes, so a default declared through addElementDefault suppressed both. That was an accident of the representation rather than a design, and defaultsAt now merges a declared default with the other defaults. Which one wins a conflict is still decided by DefaultSet's ordering rather than by scope depth, exactly as for the existing element-versus-package case. The split also fixes an aliasing bug. When an element contributed no default of its own, defaultsAt returned the enclosing scope's DefaultSet itself, and addElementDefault then added to that very set, so a default declared for one element appeared on its enclosing scope as well. No checker in this repository calls addElementDefault, so add a test that does.
defaultsAt memoized a result only when the result was non-empty. For an element whose enclosing scopes contribute no default, which is almost every element, each call therefore re-walked element to class to outer classes to package to parent packages, performing two getDeclAnnotation lookups per level plus ElementUtils.parentPackage. An element annotated @DefaultQualifier with a qualifier that this checker does not support was worse still: it produced an empty set only after AnnotationBuilder.fromName had parsed the annotation, and that parse was repeated on every call. Memoize the empty result too. Do not memoize while an annotation file is being parsed, because getDeclAnnotation can return null for an element whose annotation file has not been read yet, and apply the same condition to the non-empty case so that -AatfDoNotCache disables the memo as that option intends. DefaultSet.EMPTY is now shared much more widely, so make it immutable.
applyDefaultsElement concatenated three sequences on every call: the defaults of the scope, the conservative defaults when they apply, and the checked code defaults. Compute that precedence list once per scope instead. A scope with no declared default, which is the common case, needs no storage of its own: its precedence list is one of two shared arrays, so only a scope that does have declared defaults gets an entry in precedenceListCache. Iterating an array also avoids three TreeSet iterator allocations per call. minimizeDefaults drops any Default whose location and qualifier hierarchy already appeared earlier in the list. Such a Default cannot have an effect: which nodes a scan annotates depends on the location, the scope, and the structure of the type but never on the qualifier, and addAnnotation fills a hierarchy only when that hierarchy is empty. applyConservativeDefaults now returns false immediately when neither conservative defaults option is set. Every path through the rest of the method returns false in that case, and the rest of the method calls isFromStubFile, ElementUtils.isElementFromByteCode, and declarationFromElement. Its existing early return on an empty uncheckedCodeDefaults never fired, because createAndInitQualifierDefaults always calls addUncheckedStandardDefaults.
…ossible Each Default triggered a separate AnnotatedTypeScanner traversal, and AnnotatedTypeScanner clears visitedNodes at the start of every traversal, so the scan overhead was paid once per Default. Carry the whole precedence list into the scanner instead and apply every Default at each node. The two orders are not always equivalent. Five locations annotate, from the top-level node, some node other than the top-level node: EXCEPTION_PARAMETER annotates the alternatives of a union type, and PARAMETER, RECEIVER, RETURN, and CONSTRUCTOR_RESULT annotate the parameter, receiver, and return types of an executable type. The traversal visits those same nodes. So when a Default that annotates a node below the top level precedes one of those five, the two orders disagree about which Default reaches the child node first. Within one DefaultSet this cannot arise, because a DefaultSet is sorted by TypeUseLocation and the five cross-node locations precede the locations that annotate a descendant. It arises where two DefaultSets are concatenated and the second starts over at a low TypeUseLocation. PrecedenceList detects that case, and applyDefaults then falls back to one traversal per Default. The added test fails without the fallback.
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…ize-default-precedence-lists
…arsing-annotation-files
* A default registered through addElementDefault takes precedence over a @DefaultQualifier annotation at the same location. * A @DefaultQualifier on a nested element takes precedence over one on an enclosing element, as the manual specifies. * minimizeDefaults tolerates a qualifier that is not in the type system, rather than crashing in getTopAnnotation. * applyDefaults traverses the type once only if the applier's class does not override applyDefault. * The defaultsAt and precedenceList memo caches are LRU.
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`@framework/src/main/java/org/checkerframework/framework/util/defaults/DefaultSet.java`:
- Around line 28-40: Update the DefaultSet.EMPTY singleton so every TreeSet
view-producing method, including descendingSet and range-view methods such as
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docs/CHANGELOG.mdframework/src/main/java/org/checkerframework/framework/type/AnnotatedTypeFactory.javaframework/src/main/java/org/checkerframework/framework/type/typeannotator/DefaultQualifierForUseTypeAnnotator.javaframework/src/main/java/org/checkerframework/framework/util/defaults/DefaultSet.javaframework/src/main/java/org/checkerframework/framework/util/defaults/QualifierDefaults.javaframework/src/test/java/org/checkerframework/framework/test/junit/ElementDefaultTest.javaframework/src/test/java/org/checkerframework/framework/test/junit/SinglePassDefaultTest.javaframework/src/test/java/org/checkerframework/framework/testchecker/elementdefault/ElementDefaultAnnotatedTypeFactory.javaframework/src/test/java/org/checkerframework/framework/testchecker/elementdefault/ElementDefaultBottom.javaframework/src/test/java/org/checkerframework/framework/testchecker/elementdefault/ElementDefaultChecker.javaframework/src/test/java/org/checkerframework/framework/testchecker/elementdefault/ElementDefaultQual.javaframework/src/test/java/org/checkerframework/framework/testchecker/singlepassdefault/SinglePassDefaultAnnotatedTypeFactory.javaframework/src/test/java/org/checkerframework/framework/testchecker/singlepassdefault/SinglePassDefaultChecker.javaframework/tests/elementdefault/ElementDefault.javaframework/tests/elementdefault/ElementDefaultNesting.javaframework/tests/elementdefault/ElementDefaultPrecedence.javaframework/tests/singlepassdefault/SinglePassFallback.java
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…pplied Minimizing a precedence list, and applying every default in one traversal of the type, both assume that applying a default means "add the qualifier if the hierarchy is empty". An applier that overrides addAnnotation or applyDefault may do something else, so give it one traversal of the type per default and give it even the defaults that minimization removed. PrecedenceList retains the unminimized list for that purpose; the two lists share one array when minimization removed nothing. Also, minimize nothing if the type factory overrides the two-argument canonicalAnnotation, because then a Default's qualifier hierarchy is not determined by the Default alone. Document, in the manual and in the changelog, the precedence that addElementDefault has and the ways in which the precedence of a @DefaultQualifier annotation changed.
Track the enclosing type to compare in a single nullable variable, so that the nullness checker can relate the null check to the use.
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Depends on #8215, and includes its commit. GitHub requires a pull request's base branch to live in the base repository, so this cannot be based on
is-parsing-annotation-filesdirectly. Merge #8215 first; this branch's second commit onward is the actual content here.QualifierDefaultsrecomputed, for every type it defaulted, work whose answer never changes for a given scope.defaultsAtmemoized a result only when the result was non-empty. For an element whose enclosing scopes contribute no default, which is almost every element, each call re-walked element → class → outer classes → package → parent packages, doing twogetDeclAnnotationlookups per level plusElementUtils.parentPackage. An element annotated@DefaultQualifierwith a qualifier that this checker does not support was worse: it produced an empty set only afterAnnotationBuilder.fromNamehad parsed the annotation, and that parse was repeated on every call.applyDefaultsElementre-concatenated three sequences of defaults per call, and calledapplyConservativeDefaults, which runsisFromStubFile,ElementUtils.isElementFromByteCode, anddeclarationFromElementeven when neither conservative-defaults option is set and the answer is unconditionally false.Defaulttriggered a separateAnnotatedTypeScannertraversal of the type.AnnotatedTypeScanner.visitisfinaland callsreset(), so the scan overhead was paid once perDefault.Commits
addElementDefaultcompose with the other defaults. FieldelementDefaultsserved two purposes: defaults declared throughaddElementDefault, and the memo fordefaultsAt. They are now separate fields. This is a deliberate behavior change and the reason this commit is first: because the two purposes shared one field,defaultsAtconsulted it before looking at the element's own@DefaultQualifierand before walking enclosing scopes, so a declared default suppressed both. The split also fixes an aliasing bug whereaddElementDefaultmutated the enclosing scope'sDefaultSetin place. No checker in this repository callsaddElementDefault, so this commit adds a test that does.-AatfDoNotCachedisables the memo as that option intends.applyConservativeDefaults.The single pass is not unconditionally equivalent
Five locations annotate, from the top-level node, some node other than the top-level node:
EXCEPTION_PARAMETERannotates the alternatives of a union type, andPARAMETER,RECEIVER,RETURN, andCONSTRUCTOR_RESULTannotate an executable type's parameter, receiver, and return types. The traversal visits those same nodes. So when aDefaultthat annotates a node below the top level precedes one of those five, per-node and per-Defaultordering disagree about which reaches the child node first.Within one
DefaultSetthis cannot arise, because aDefaultSetis sorted byTypeUseLocationand the five cross-node locations precede the locations that annotate a descendant. It arises where twoDefaultSets are concatenated and the second starts over at a low location.PrecedenceListdetects that case and falls back to one traversal perDefault.framework/tests/singlepassdefault/covers it, and fails without the fallback.Performance
A/B wall clock, alternating runs of
checker.jarbuilt from each branch over the same source tree. Workload:checker/jtreg/slowtypechecking/plus allchecker-qualandchecker-utilsources,-proc:onlywith the Nullness Checker, ~20 s per run, zero diagnostics so nothing aborted early.Paired per iteration: faster in 9 of 9 clean iterations, median −10.3%, sign test p = 0.004.
Caveats, in the interest of not overselling this: the machine became contended partway through, so the magnitude is soft; and
slowtypecheckingis by construction code where type traversals dominate, which is what commit 4 addresses, so −10% should be read as an upper bound rather than as what a typical project will see. I have not yet measured with commit 4 reverted, so the split between what the memoization buys and what the single traversal buys is not established.Testing
./gradlew :framework:test :checker:test. The one failure wasindex-initializedfieldsemitting aslow.typecheckingwarning while the machine was at load 130.Both new tests were checked to fail when the behavior they guard is reverted, so neither is vacuous.
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