fix(pipeline): suppress weak Python member calls (distilled from DeusData#1324)

Python attribute calls were not classified as member calls, so weak
short-name strategies (suffix_match / unique_name / field_type_hint)
could bind `obj.method()` to an arbitrary same-named project symbol —
`accelerator.print()` resolving to MockAccelerator.print.

Flag a Python attribute call is_method when its receiver is unresolved,
and extend the existing TS/JS weak-member guard to Python. Receivers that
ARE known stay exempt: self/cls, super(), and any identifier bound by one
of the file's imports (including the root of an attribute chain), so
Python's canonical `module.function()` cross-file call still resolves.

The guard helper is renamed cbm_tsjs_suppress_weak_method_match ->
cbm_suppress_weak_member_match. Its drop-list is unchanged, and the
per-language gate stays at the two call sites, which enumerate the same
language set in pass_calls.c and pass_parallel.c so the sequential and
parallel resolvers cannot diverge. ArkTS remains in that set.

python/S6/inherited_method in the resolution probe now asserts calls == 0,
recording the same trade TypeScript took when the receiver-aware guard
landed: the edge it used to produce came from a unique_name registry
fallback (measured on main: strategy=unique_name, cands=1, conf=0.7500)
where a weak short-name guess happened to be right in a 2-file fixture.
It flips back to >= 1 once py_lsp_cross resolves inheritance, matching the
flip-back note already carried on the TypeScript S6 case.

Fixes DeusData#1276
Signed-off-by: Martin Vogel <martin.vogel.tech@gmail.com>
Co-authored-by: Enferlain <15861396+Enferlain@users.noreply.github.com>

Author: DeusData

internal/cbm/cbm.h

@@ -259,9 +259,13 @@ typedef struct {
     uint32_t site_start_byte;           // exact AST occurrence span; end > start when present
     uint32_t site_end_byte;             // exclusive byte offset in the source file
     CBMSourceOrigin source_origin;      // raw source or C-family preprocessed buffer
-    bool is_method;                     // method/member call with a non-self receiver. Perl:
+    bool is_method;                     // method/member call with an UNRESOLVED receiver. Perl:
                                         // arrow/method call ($obj->m). TS/JS/TSX: member call
-                                        // x.foo() whose receiver is not this/super. Default false.
+                                        // x.foo() whose receiver is not this/super. Python:
+                                        // x.foo() where x is not self/cls/super() and is not
+                                        // rooted in an imported name. Read by the weak-member
+                                        // guard and by the pxc synthetic-carrier dedup key in
+                                        // pass_lsp_cross.c. Default false.
     bool requires_lsp_resolution;       // synthetic semantic candidate (for example an implicit
                                         // C++ operator). Never fall back to textual resolution.
 } CBMCall;

internal/cbm/extract_calls.c

@@ -2740,6 +2740,66 @@ static char *resolve_objectscript_instance_call(CBMArena *a, TSNode node, const
     return NULL;
 }
 
+/* True when a Python attribute-call receiver is EXEMPT from the weak-member
+ * guard (#1276). Three exemptions, each because the receiver is in fact known:
+ *   - `self.x()` / `cls.x()`  — a direct self/cls receiver keeps class-local
+ *     semantics; the enclosing class is the right namespace for a weak match.
+ *   - `super().x()`           — same, via the base class.
+ *   - `helper.compute()`      — an identifier bound by one of THIS file's
+ *     imports, including the root of an attribute chain (`pkg.sub.fn()`).
+ *     module.function() is Python's canonical cross-file call shape and the
+ *     import map resolves it; flagging it would kill the true edge.
+ * Everything else — a parameter, a local, an attribute of self — has no
+ * statically-known type here, so the call must not bind by short name alone.
+ * Note `self.client.send()` is NOT exempt: the receiver is `self.client`, an
+ * attribute of unknown type, not `self` itself. */
+static bool python_receiver_is_exempt(CBMExtractCtx *ctx, TSNode receiver) {
+    if (ts_node_is_null(receiver)) {
+        return false;
+    }
+
+    /* super().m() — the receiver is a call node whose function is `super`. */
+    if (strcmp(ts_node_type(receiver), "call") == 0) {
+        TSNode fn = ts_node_child_by_field_name(receiver, TS_FIELD("function"));
+        if (!ts_node_is_null(fn) && strcmp(ts_node_type(fn), "identifier") == 0) {
+            char *name = cbm_node_text(ctx->arena, fn, ctx->source);
+            return name && strcmp(name, "super") == 0;
+        }
+        return false;
+    }
+
+    /* Walk an attribute chain down to its root identifier: for `pkg.sub.fn()`
+     * the receiver is `pkg.sub`, whose root is `pkg` — the name an import binds. */
+    bool direct_identifier = strcmp(ts_node_type(receiver), "identifier") == 0;
+    TSNode root = receiver;
+    while (!ts_node_is_null(root) && strcmp(ts_node_type(root), "attribute") == 0) {
+        root = ts_node_child_by_field_name(root, TS_FIELD("object"));
+    }
+    if (ts_node_is_null(root) || strcmp(ts_node_type(root), "identifier") != 0) {
+        return false;
+    }
+
+    char *name = cbm_node_text(ctx->arena, root, ctx->source);
+    if (!name) {
+        return false;
+    }
+    /* self/cls only as a DIRECT receiver: `self.m()` is class-local, but
+     * `self.client.m()` has receiver `self.client` of unknown type. */
+    if (direct_identifier && (strcmp(name, "self") == 0 || strcmp(name, "cls") == 0)) {
+        return true;
+    }
+    /* Import-bound root, incl. aliases (`import tools as toolkit` binds
+     * local_name "toolkit"). Per-file scan: imports.count is a file-local
+     * number (tens), never the corpus, so this stays O(file), not O(corpus). */
+    for (int i = 0; i < ctx->result->imports.count; i++) {
+        const char *local_name = ctx->result->imports.items[i].local_name;
+        if (local_name && strcmp(local_name, name) == 0) {
+            return true;
+        }
+    }
+    return false;
+}
+
 static bool is_objectscript_language(CBMLanguage language) {
     return language == CBM_LANG_OBJECTSCRIPT_UDL || language == CBM_LANG_OBJECTSCRIPT_ROUTINE;
 }
@@ -3357,6 +3417,20 @@ CBMInvocationDescriptor handle_calls(CBMExtractCtx *ctx, TSNode node, const CBML
                 strcmp(ts_node_type(node), "method_call_expression") == 0) {
                 call.is_method = true;
             }
+            // Python receiver-aware guard (#1276; same intent as the Perl and
+            // TS/JS flags). Flag an attribute call x.foo() whose receiver is not
+            // self/cls/super() and is not rooted in an imported name, so the
+            // call-resolution pass can suppress weak short-name matches for it
+            // (`accelerator.print()` must not bind MockAccelerator.print).
+            // Imported receivers stay unflagged: module.function() is Python's
+            // canonical cross-file call and the import map resolves it.
+            if (ctx->language == CBM_LANG_PYTHON && strcmp(ts_node_type(node), "call") == 0) {
+                TSNode fn = ts_node_child_by_field_name(node, TS_FIELD("function"));
+                if (!ts_node_is_null(fn) && strcmp(ts_node_type(fn), "attribute") == 0) {
+                    TSNode obj = ts_node_child_by_field_name(fn, TS_FIELD("object"));
+                    call.is_method = !python_receiver_is_exempt(ctx, obj);
+                }
+            }
             // TS/JS/TSX receiver-aware guard (#592/#606 direction; same intent
             // as the Perl flag above). Flag a member call x.foo() whose receiver
             // is NOT `this`/`super`. When the TS-LSP cannot resolve the receiver

src/pipeline/pass_calls.c

@@ -606,20 +606,29 @@ static int resolve_single_call(cbm_pipeline_ctx_t *ctx, CBMCall *call,
         return 0;
     }
 
-    /* TS/JS/TSX weak-method suppression (#592/#606). A member call x.foo() only
-     * reaches the registry when the TS-LSP could not resolve the receiver type
-     * (the LSP block above already returned for type-resolved calls, including
-     * the "resolved but target out of gbuf" fall-through). Binding such a call
-     * by a weak short-name strategy fabricates an edge (`re.test()` -> a project
-     * `test`). Rather than drop it here — which would also skip the service
-     * bypasses below and emit_classified_edge's route/HTTP/CONFIG branches —
-     * defer to emit_classified_edge and suppress ONLY the plain-CALLS
-     * fall-through, so every service edge stays main-identical. res.strategy may
-     * be lsp_* here; the helper's explicit drop-list leaves lsp_* untouched. */
-    bool is_tsjs = lang == CBM_LANG_JAVASCRIPT || lang == CBM_LANG_TYPESCRIPT ||
-                   lang == CBM_LANG_TSX || lang == CBM_LANG_ARKTS;
-    bool tsjs_drop_plain_call =
-        cbm_tsjs_suppress_weak_method_match(is_tsjs, call->is_method, res.strategy);
+    /* Dynamic-language weak-member suppression (#592/#606/#1276). A member call
+     * x.foo() only reaches the registry when the language's LSP could not
+     * resolve the receiver type (the LSP block above already returned for
+     * type-resolved calls, including the "resolved but target out of gbuf"
+     * fall-through). Binding such a call by a weak short-name strategy
+     * fabricates an edge (`re.test()` -> a project `test`,
+     * `accelerator.print()` -> MockAccelerator.print). Rather than drop it here
+     * — which would also skip the service bypasses below and
+     * emit_classified_edge's route/HTTP/CONFIG branches — defer to
+     * emit_classified_edge and suppress ONLY the plain-CALLS fall-through, so
+     * every service edge stays main-identical. res.strategy may be lsp_* here;
+     * the helper's explicit drop-list leaves lsp_* untouched.
+     *
+     * This language set MUST match the one in pass_parallel.c exactly — a
+     * language gated on only one resolver produces an edge on the sequential
+     * path and not the parallel one (or vice versa), breaking MT determinism.
+     * ArkTS belongs to the JS/TS family here (#1842); dropping it would
+     * reintroduce the #592/#606 false-edge class for .ets files. */
+    bool suppress_weak_member = lang == CBM_LANG_PYTHON || lang == CBM_LANG_JAVASCRIPT ||
+                                lang == CBM_LANG_TYPESCRIPT || lang == CBM_LANG_TSX ||
+                                lang == CBM_LANG_ARKTS;
+    bool drop_plain_call =
+        cbm_suppress_weak_member_match(suppress_weak_member, call->is_method, res.strategy);
 
     /* Service-pattern HTTP/ASYNC calls to an EXTERNAL client library (e.g.
      * `requests.get("/api/orders/{id}")`) resolve to a QN containing the library
@@ -652,7 +661,7 @@ static int resolve_single_call(cbm_pipeline_ctx_t *ctx, CBMCall *call,
         return 0;
     }
     emit_classified_edge(ctx, call, source_node, target_node, &res, module_qn, imp_keys, imp_vals,
-                         imp_count, tsjs_drop_plain_call);
+                         imp_count, drop_plain_call);
     return SKIP_ONE;
 }
 

src/pipeline/pass_parallel.c

@@ -2465,20 +2465,25 @@ static void resolve_file_calls(resolve_ctx_t *rc, resolve_worker_state_t *ws, CB
             continue;
         }
 
-        /* TS/JS/TSX weak-method suppression (#592/#606). The receiver-aware guard
-         * must NOT drop this call here: doing so would also skip the #523
-         * callee-name service bypass below, emit_service_edge's route/gRPC/config
-         * branches, and its unconditional detect_url_in_args (which classifies
-         * verb-suffix HTTP clients like api.patch('/x')). Instead, defer to the
-         * emit path and suppress ONLY the plain-CALLS fall-through
-         * (emit_normal_calls_edge), so every service edge stays main-identical by
-         * construction. res.strategy may carry an lsp_* value here (LSP-resolved
-         * calls keep res through this point); the helper's EXPLICIT drop-list
-         * leaves lsp_ts_method / lsp_cross untouched. See #606 direction. */
-        bool is_tsjs = lang == CBM_LANG_JAVASCRIPT || lang == CBM_LANG_TYPESCRIPT ||
-                       lang == CBM_LANG_TSX || lang == CBM_LANG_ARKTS;
-        bool tsjs_drop_plain_call =
-            cbm_tsjs_suppress_weak_method_match(is_tsjs, call->is_method, res.strategy);
+        /* Dynamic-language weak-member suppression (#592/#606/#1276). The
+         * receiver-aware guard must NOT drop this call here: doing so would also
+         * skip the #523 callee-name service bypass below, emit_service_edge's
+         * route/gRPC/config branches, and its unconditional detect_url_in_args
+         * (which classifies verb-suffix HTTP clients like api.patch('/x')).
+         * Instead, defer to the emit path and suppress ONLY the plain-CALLS
+         * fall-through (emit_normal_calls_edge), so every service edge stays
+         * main-identical by construction. res.strategy may carry an lsp_* value
+         * here (LSP-resolved calls keep res through this point); the helper's
+         * EXPLICIT drop-list leaves lsp_ts_method / lsp_cross untouched. See
+         * #606 direction.
+         *
+         * This language set MUST match the one in pass_calls.c exactly — see the
+         * note there. ArkTS belongs to the JS/TS family (#1842). */
+        bool suppress_weak_member = lang == CBM_LANG_PYTHON || lang == CBM_LANG_JAVASCRIPT ||
+                                    lang == CBM_LANG_TYPESCRIPT || lang == CBM_LANG_TSX ||
+                                    lang == CBM_LANG_ARKTS;
+        bool drop_plain_call =
+            cbm_suppress_weak_member_match(suppress_weak_member, call->is_method, res.strategy);
 
         /* Service-pattern HTTP/ASYNC client call (`requests.get(url)`): the
          * service signal lives in the callee_name. The registry can mis-resolve
@@ -2573,7 +2578,7 @@ static void resolve_file_calls(resolve_ctx_t *rc, resolve_worker_state_t *ws, CB
         _rc_t0 = extract_now_ns();
         emit_service_edge(ws->local_edge_buf, source_node, target_node, call, &res, module_qn,
                           rc->registry, rc->main_gbuf, imp_keys, imp_vals, imp_count,
-                          tsjs_drop_plain_call);
+                          drop_plain_call);
         atomic_fetch_add_explicit(&rc->time_ns_rc_emit, extract_now_ns() - _rc_t0,
                                   memory_order_relaxed);
         ws->calls_resolved++;

src/pipeline/pipeline.h

@@ -269,13 +269,16 @@ bool cbm_perl_is_builtin(const char *name);
 bool cbm_perl_suppress_generic_match(bool is_perl, bool is_method, const char *callee_name,
                                      const char *strategy);
 
-/* Decide whether a resolved TS/JS/TSX member-call edge is weak-strategy noise to
- * drop (#592/#606): true only for TS/JS, only for a member call with a
- * non-this/super receiver (is_method), and only when the match used a weak
- * short-name strategy (suffix_match / unique_name / field_type_hint / fuzzy).
+/* Decide whether a resolved member-call edge is weak-strategy noise to drop
+ * (#592/#606/#1276): true only when the CALLER's per-language gate says the
+ * guard applies (`enabled`), only for a member call with an unresolved receiver
+ * (is_method), and only when the match used a weak short-name strategy
+ * (suffix_match / unique_name / field_type_hint / fuzzy).
  * Explicit drop-list keeps every lsp_* / import / same-module / qualified match.
+ * The language set lives at the call sites (pass_calls.c / pass_parallel.c) and
+ * must be identical in both, or the sequential and parallel resolvers diverge.
  * Pure; unit-tested in test_registry.c. */
-bool cbm_tsjs_suppress_weak_method_match(bool is_tsjs, bool is_method, const char *strategy);
+bool cbm_suppress_weak_member_match(bool enabled, bool is_method, const char *strategy);
 
 /* #725: drop a suffix_match CALLS edge when the caller language and the
  * target file's language disagree. unique_name (candidates == 1) is #1572

src/pipeline/registry.c

@@ -429,19 +429,27 @@ bool cbm_perl_suppress_generic_match(bool is_perl, bool is_method, const char *c
     return true; /* weak short-name match (suffix_match / unique_name / …) → drop */
 }
 
-/* TS/JS analogue of the Perl guard above (#592/#606 direction; precedent #477).
- * A member call `x.foo()` reaches the weak textual cascade ONLY when the TS-LSP
- * could not resolve the receiver type — type-resolved calls win via lsp_*
- * strategies before the registry runs. Binding such a call to a project symbol
- * by a weak short-name strategy fabricates a CALLS edge (`re.test()` ->
- * SalesforceRestClient.test, `date.toISOString()` -> any project toISOString).
- * Drop ONLY the weak strategies; keep import/same-module/qualified-tail matches
- * and every lsp_* strategy. Uses an EXPLICIT drop-list (not keep-list +
- * default-drop) because the parallel resolver runs lsp_* strategies through the
- * same guard variable — a default-drop would silently kill lsp_ts_method. Pure
- * + side-effect-free so the contract is unit-testable without a full pipeline. */
-bool cbm_tsjs_suppress_weak_method_match(bool is_tsjs, bool is_method, const char *strategy) {
-    if (!is_tsjs || !is_method || !strategy || !strategy[0]) {
+/* Dynamic-language analogue of the Perl guard above (#592/#606/#1276
+ * direction; precedent #477). A member call `x.foo()` reaches the weak textual
+ * cascade ONLY when the language's LSP could not resolve the receiver type —
+ * type-resolved calls win via lsp_* strategies before the registry runs.
+ * Binding such a call to a project symbol by a weak short-name strategy
+ * fabricates a CALLS edge (`re.test()` -> SalesforceRestClient.test,
+ * `accelerator.print()` -> MockAccelerator.print). Drop ONLY the weak
+ * strategies; keep import/same-module/qualified-tail matches and every lsp_*
+ * strategy. Uses an EXPLICIT drop-list (not keep-list + default-drop) because
+ * the parallel resolver runs lsp_* strategies through the same guard variable —
+ * a default-drop would silently kill lsp_ts_method. Pure + side-effect-free so
+ * the contract is unit-testable without a full pipeline.
+ *
+ * `enabled` is the CALLER's per-language gate, deliberately kept OUT of this
+ * helper: the guard applies only to the language set each call site enumerates
+ * (today Python plus the JS/TS family including ArkTS). Widening it is a
+ * per-language decision made at the call sites in pass_calls.c and
+ * pass_parallel.c, which MUST stay in lockstep — a gate added to only one of
+ * them diverges the sequential and parallel resolvers. */
+bool cbm_suppress_weak_member_match(bool enabled, bool is_method, const char *strategy) {
+    if (!enabled || !is_method || !strategy || !strategy[0]) {
         return false;
     }
     /* Weak short-name strategies that actually reach the call-resolution guards: