fix(kernel): C and C++ resolver defects reproduced in the #510 review by bompus · Pull Request #511 · bompus/codegraph

bompus · 2026-10-16T18:26:15Z

C and C++ calls that the native resolver linked to the wrong overload, the wrong namespace or a function the call cannot see now link to the right target or to nothing. Each fix has a test that fails without it. The defects were reproduced during the review of #510.

Fixed

Member template only specialized for other arguments (cubic 4296873889): Put<long>() in a class that only specializes Put<int> no longer links a base class's Put or a namesake; the implicit-this step refuses the reference.
Specialization choice spans namespaces (4296873951) and foo.foo<long>() (4296873982): a specialization of a::f no longer removes b::f, and template arguments are read after the method name, not after a receiver of the same name.
C flag detection (4296874003, 4296874009, 4296922106): an empty build file bounds a component, a #define inside a comment or raw string counts for nothing, and a nested component's #define does not count for the outer one.
Static function through a late or disabled include (4296922126): a static function in another source file is reached only through an #include written before the call and not under #if 0.
Namespace alias scope (4296873977) and global alias target (4296874024): an alias applies from its line on and only inside the block that declares it, and namespace a = ::lib; names the global lib.
Name macro order (4296874017): ROCKSDB_NAMESPACE::DB before the #define, or after an #undef, no longer resolves through the macro. An #undef in an #if 0 branch changes nothing, and an #include after an #undef that defines the macro defines it again (CodeRabbit review 5552142946).
Rvalue reference (4296874030): Foo x; Take(x) links Take(const Foo&), not Take(Foo&&). An argument that converts to the parameter's class, such as an int passed to push_back(basic_json&&), still takes the && overload. That case showed up in the nlohmann/json corpus and has its own test.
constexpr pointer (4296922223): constexpr Widget* p points at a non-const Widget.
Const container element (CodeRabbit review 5551037762): *v.begin() on a const std::vector<Foo>& is a const Foo.
Multidimensional array (4296922156): int a[3][4] passed to f takes f(int (*)[4]), not f(int*).
Top-fit tie (4296922134): when several overloads fit a call's argument types equally well, the argument-type choice no longer takes the first of them. This applies only to calls resolved by the qualified-name step, such as a call into a namespace a macro opens. A plain written-out namespace is resolved by the name step, which still picks by where the overloads are, as upstream does.

Verification

19 new tests in 10 blocks. The 15 that exercise a defect failed on 2628bfdb; the 2 added for the review of this PR (directives in disabled branches, include after #undef) failed on e397e414; the 2 controls (an include before the call, a call naming its specialization) passed there and still pass. The tie test's final fixture and the converted-argument case were checked against a kernel built without their fix.
All __tests__/cpp-*.test.ts and __tests__/c-*.test.ts plus kernel-golden-dumps: 68 files, 646 tests passed (re-run on ab786c67; precision, clippy and tsc re-run there too, results unchanged). The golden dumps did not change.
Full suite: 742 files, 9,240 passed and 39 skipped. No Native stack trace or Worker exited unexpectedly in stderr.
npx tsc --noEmit -p ., npm run check:agent-docs and cargo clippy --release --lib -- -D warnings pass. Each commit was also checked on its own with clippy.
Precision (npm run eval:precision), base 2628bfdb against this branch, compared edge by edge:
- jq (C): 7,784 edges both times, no edge differs.
- nlohmann/json (C++): 28,803 edges both times, absent cases 11/11 and present cases 7/7 held. Four calls moved from push_back(basic_json&&) to push_back(const basic_json&): operator+=(const basic_json&) and patch_inplace in json.hpp, and the same two in tests/abi/.../json_v3_10_5.hpp. Each passes a basic_json lvalue, so the new targets are correct.

README rows checked: "About this fork" name-resolution row, the C/C++ paragraphs, and the C++ differences list (typedef and alias scope, -> calls, receiver types, namespace aliases, object creation). None is made wrong by this change; the namespace-alias row still holds and is now stricter. The precision-replay row is unaffected.

Not covered

const_iterator ->get() (cubic 4296922187): not fixed. The fork does not choose between a method's const and non-const overloads by the receiver's constness at all. const S* p; p->get() and const S& s; s.get() also link the non-const get(), so this needs a new feature rather than a fix.
lib::f(1) with f(int) and f(double) links f(double): not fixed. Both overloads score alike and the name step picks by location; choosing the exact match over a conversion needs overload ranking that the fork does not have. The top-fit tie change does not reach it.
Out of scope for this PR:
- src/extraction/**, the TypeScript in src/resolution/**, and cpp-specializations.ts with its Rust scanner mirror (cubic 4296873943 on digit separators and 4296922172 on a return type that repeats the function's name): these belong to separate owners.
- Upstream's tests.
- Review findings that did not reproduce.

Summary by cubic

Fixes C and C++ calls the native resolver linked to the wrong overload, the wrong namespace, or a function the call cannot see. The defects were reproduced during the review of #510; each fix has a test that fails without it.

Bug Fixes

Member template calls: Put<long>() in a class that only specializes Put<int> links nothing instead of a base class's Put; a specialization of a::f no longer removes b::f; template arguments in foo.foo<long>() are read after the method name, not the receiver.
C flag detection: an empty build file bounds a component, a #define inside a comment or raw string defines nothing, and a nested component's #define is not the outer one's.
A static function in another source file is reached only through an #include written before the call, not one under #if 0.
Namespace aliases apply from their declaration line on and only inside the block that declares them; namespace a = ::lib; names the global lib.
ROCKSDB_NAMESPACE::DB written before its #define or after an #undef no longer resolves through the macro; an #undef inside #if 0 is ignored, and an #include after an #undef that defines the macro defines it again.
Overload selection: Foo x; Take(x) links Take(const Foo&) not Take(Foo&&), constexpr Widget* p points at a non-const Widget, *v.begin() on a const container is const Foo, int a[3][4] takes f(int (*)[4]), and when several overloads fit equally well the qualified-name step links none of them.

Migration

Re-index C and C++ projects after upgrading.

^{Written for commit ab786c6. Summary will update on new commits.}

Summary by CodeRabbit

Bug Fixes
- Improved C and C++ call resolution for overloaded functions, including cases involving argument types, arrays, constness, templates, and specializations.
- Corrected namespace alias and macro lookup to respect declaration scope, source order, and active includes.
- Refined visibility of static functions and C feature-flag definitions based on include order, component boundaries, and actual preprocessor directives.
- Prevented unresolved member-template calls from linking to unrelated functions.
Upgrade Note
- Re-index affected C and C++ projects to apply these fixes.

…'s candidates A specialization of `a::f` no longer removes `b::f` before the call's scope picks between them, so `f<int>(1)` inside namespace `b` reaches `b::f`. The template arguments a call writes are read after the name it calls, not after a receiver of that name: `foo.foo<long>()` is `foo<long>`, not `foo<int>`.

…es for other arguments links nothing A bare or `this->` call such as `Put<long>()`, in a class whose only indexed `Put` is the `Put<int>` specialization, reaches the class's own template, which has no body in the index. Lookup used to go on to a base class's `Put`, and stopping it alone let name matching link a namesake. The implicit-this step now refuses the reference, as construction and plain receiver calls already do.

…'s own component Three cases made a flag look set, so a header's flag-only definition kept the call instead of the definition the default build compiles: - an empty build file did not bound a component, so the search for a `#define` ran on into the parent component; - a `#define` inside a comment or a raw string counted; - a nested component's `#define` counted for the component around it.

…efore the call that the build compiles A call reached a `static` function in another source file whenever the calling file included that file anywhere. An include after the call, or one inside `#if 0`, now leaves the call unresolved, as a compiler does. Includes written before the call still count, directly or through the headers they include.

…and inside its own block An alias a function declares no longer applies to the rest of the file, and an alias at namespace scope applies only from its own line on (or after the include that brings it in). An alias of `::lib` keeps the leading `::`, so it names the global `lib` rather than a `lib` nested in the namespace around the code.

…ined `ROCKSDB_NAMESPACE::DB` written before `#define ROCKSDB_NAMESPACE rocksdb`, or after an `#undef` of it, no longer resolves as `rocksdb::DB`. The macro counts where the reference's own file defines it on an earlier line, or where an include before the reference brings in a file that defines it.

…erload `Foo x; Take(x)` with `Take(const Foo&)` and `Take(Foo&&)` linked the `Foo&&` overload. An object of the parameter's own type that a name or dereference reads now never fits a `&&` parameter, unless the function's own template parameter deduces it. An argument that converts to the parameter's type, such as an `int` passed to `push_back(Value&&)`, is a temporary and keeps fitting it.

`constexpr Widget* p` makes the pointer const, not the `Widget`, so `Point(p)` with `Point(Widget*)` and `Point(const Widget*)` now links the non-const overload. A `constexpr` object, and a `const` pointer target, still count as const.

`*v.begin()` on a `const std::vector<Foo>&` is a `const Foo`, so `Bind(*v.begin())` with `Bind(Foo&)` and `Bind(const Foo&)` now links the const overload. A const container's `begin()` hands out its `const_iterator`, and that iterator's element is const.

…ow, not to an element `int a[3][4]` decays to `int (*)[4]`, so `f(a)` with `f(int*)` and `f(int (*)[4])` now links the pointer-to-array overload, and a one-dimensional array still links `f(int*)`. A `void*` parameter takes either.

…nks none of them When several overloads fit a call's argument types equally well and only some fit worse, the argument-type choice took the first of the best. It now decides only when one overload fits best alone or a const twin tells them apart. This shows on calls the qualified-name step resolves, such as a namespace a macro opens; overload selection by the name step keeps choosing by where the overloads are.

coderabbitai · 2026-10-16T18:26:57Z

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CHANGELOG.md
__tests__/cpp-macro-namespace.test.ts
codegraph-kernel/src/resolve/cpp_namespace.rs

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CHANGELOG.md
codegraph-kernel/src/resolve/cpp_namespace.rs

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📝 Walkthrough

The changes refine C and C++ call resolution. C feature definitions are checked against component boundaries, and static functions require an earlier active include. C++ lookup now accounts for declaration order, argument types, constness, and template specialization matches.

Changes: C resolution

Layer / File(s)	Summary
Component-scoped feature flags `codegraph-kernel/src/resolve/c_feature_variants.rs`, `__tests__/c-feature-macro-variants.test.ts`, `CHANGELOG.md`	Build-file presence establishes component boundaries. Feature definitions count only when a directive-line `#define` belongs to the queried component. Tests cover empty build files, comments, raw strings, and nested components.
Static function include visibility `codegraph-kernel/src/resolve/names.rs`, `__tests__/c-static-call-rescue.test.ts`	A static source function is visible through an earlier active include, including transitive include paths. Tests check inactive, later, and earlier includes.

C++ resolution

Layer / File(s)	Summary
Namespace aliases and macro lookup `codegraph-kernel/src/resolve/cpp_namespace.rs`, `codegraph-kernel/src/resolve/cpp_types.rs`, `__tests__/cpp-global-alias-target.test.ts`, `__tests__/cpp-macro-namespace.test.ts`, `CHANGELOG.md`	Namespace aliases and macro spellings are evaluated at the reference location. Tests cover local aliases, global qualification, and macro definition and removal order.
Overload types and ranking `codegraph-kernel/src/resolve/cpp_overloads.rs`, `codegraph-kernel/src/resolve/cpp_receivers.rs`, `codegraph-kernel/src/resolve/cpp_range_for.rs`, `__tests__/cpp-free-function-overloads.test.ts`, `__tests__/cpp-overload-argument-types.test.ts`, `__tests__/cpp-overload-constness.test.ts`	Overload matching accounts for array dimensions, pointer-to-array types, reference binding, pointer constness, and const iterators. Type ranking leaves tied best fits unresolved.
Template specialization and implicit member calls `codegraph-kernel/src/resolve/cpp_specializations.rs`, `codegraph-kernel/src/resolve/cpp_implicit_this.rs`, `codegraph-kernel/src/resolve/pipeline.rs`, `__tests__/cpp-specialization-names.test.ts`, `__tests__/cpp-implicit-this-calls.test.ts`	Specialization selection is grouped by qualified name. Implicit member-template lookup refuses a call when no indexed specialization matches.

Priority: ➖ Normal

Merge Risk: ⚪ Minimal · up to ab786

This change tightens C and C++ call resolution and adds tests for the macro-order cases. No actionable merge-blocking risk is evident from the supplied context.

Pre-merge checks: 6

Check name	Status	Explanation
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Suppressions Explained		The pull request adds no lint, type-check, or compiler-diagnostic suppression directive. Diff inspection found no added `eslint-disable`, `@ts-ignore`, `@ts-expect-error`, Rust `#[allow(...)]`, config…
User-Visible Changes Documented		The pull request changes C/C++ resolver behavior, tests, and CHANGELOG.md only. The authoritative diff adds no CLI command or flag, MCP tool or argument, supported language/framework, agent target, or…
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly identifies the kernel fix and the C and C++ resolver defects addressed by the pull request. It is concise and directly related to the main changes.

Full details: Suppressions Explained

Explanation

The pull request adds no lint, type-check, or compiler-diagnostic suppression directive. Diff inspection found no added eslint-disable, @ts-ignore, @ts-expect-error, Rust #[allow(...)], config ignore entry, or equivalent directive. The added #if/#undef text is fixture content and documentation, not diagnostic suppression.

Full details: User-Visible Changes Documented

Explanation

The pull request changes C/C++ resolver behavior, tests, and CHANGELOG.md only. The authoritative diff adds no CLI command or flag, MCP tool or argument, supported language/framework, agent target, or config key. No README.md or site documentation update is required by this check.

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Inline comments:
Review comments at @codegraph-kernel/src/resolve/cpp_namespace.rs:
- Line 197: Update the directive lookup for the referenced name to ignore
directives in inactive branches when the reference line is active, using
is_off_by_default for both lines; preserve the existing lookup behavior when the
reference line is inactive.
- Around line 197-202: Update cpp_name_macro_defined_at to compare the latest
applicable local directive with definitions supplied by includes before the
reference. Preserve precedence for a local #define, but allow a later included
#define to make the macro active after a local #undef; keep the result in
reference order so cpp_name_macro_spelling can resolve the macro.

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CHANGELOG.md
__tests__/c-feature-macro-variants.test.ts
__tests__/c-static-call-rescue.test.ts
__tests__/cpp-free-function-overloads.test.ts
__tests__/cpp-global-alias-target.test.ts
__tests__/cpp-implicit-this-calls.test.ts
__tests__/cpp-macro-namespace.test.ts
__tests__/cpp-overload-argument-types.test.ts
__tests__/cpp-overload-constness.test.ts
__tests__/cpp-specialization-names.test.ts
codegraph-kernel/src/resolve/c_feature_variants.rs
codegraph-kernel/src/resolve/cpp_implicit_this.rs
codegraph-kernel/src/resolve/cpp_namespace.rs
codegraph-kernel/src/resolve/cpp_overloads.rs
codegraph-kernel/src/resolve/cpp_range_for.rs
codegraph-kernel/src/resolve/cpp_receivers.rs
codegraph-kernel/src/resolve/cpp_specializations.rs
codegraph-kernel/src/resolve/cpp_types.rs
codegraph-kernel/src/resolve/names.rs
codegraph-kernel/src/resolve/pipeline.rs

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… and an include after its #undef defines it again

bompus added 12 commits October 16, 2026 12:08

docs(changelog): note the C and C++ resolver fixes

e397e41

coderabbitai Bot reviewed Oct 16, 2026

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Comment thread codegraph-kernel/src/resolve/cpp_namespace.rs Outdated

Comment thread codegraph-kernel/src/resolve/cpp_namespace.rs Outdated

fix(kernel): a C++ name macro ignores directives in disabled branches…

ab786c6

… and an include after its #undef defines it again

bompus merged commit 4921cb2 into fork/consolidated Oct 16, 2026
9 of 11 checks passed

bompus deleted the fix/cpp-resolver-reproduced-defects branch October 16, 2026 19:40

bompus mentioned this pull request Oct 17, 2026

merge: reconcile upstream through e8ec7fd8 (C++ member-chain calls, test temp-dir cleanup) #513

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fix(kernel): C and C++ resolver defects reproduced in the #510 review - #511

fix(kernel): C and C++ resolver defects reproduced in the #510 review#511
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