fix #30679, call correct method for invoke calls in jl_invoke fallback (#31845)

(cherry picked from commit 4e20cc2)

Author: JeffBezanson

src/gf.c

@@ -35,28 +35,6 @@ JL_DLLEXPORT size_t jl_get_tls_world_age(void)
     return jl_get_ptls_states()->world_age;
 }
 
-JL_DLLEXPORT jl_value_t *jl_invoke(jl_method_instance_t *meth, jl_value_t **args, uint32_t nargs)
-{
-    jl_callptr_t fptr = meth->invoke;
-    if (fptr != jl_fptr_trampoline) {
-        return fptr(meth, args, nargs);
-    }
-    else {
-        // if this hasn't been inferred (compiled) yet,
-        // inferring it might not be able to handle the world range
-        // so we just do a generic apply here
-        // because that might actually be faster
-        // since it can go through the unrolled caches for this world
-        // and if inference is successful, this meth would get updated anyways,
-        // and we'll get the fast path here next time
-
-        // TODO: if `meth` came from an `invoke` call, we should make sure
-        // meth->def is called instead of doing normal dispatch.
-
-        return jl_apply(args, nargs);
-    }
-}
-
 /// ----- Handling for Julia callbacks ----- ///
 
 JL_DLLEXPORT int8_t jl_is_in_pure_context(void)
@@ -2200,6 +2178,8 @@ JL_DLLEXPORT jl_value_t *jl_gf_invoke_lookup(jl_value_t *types, size_t world)
     return (jl_value_t*)entry;
 }
 
+jl_value_t *jl_gf_invoke_by_method(jl_method_t *method, jl_value_t **args, size_t nargs);
+
 // invoke()
 // this does method dispatch with a set of types to match other than the
 // types of the actual arguments. this means it sometimes does NOT call the
@@ -2212,13 +2192,10 @@ JL_DLLEXPORT jl_value_t *jl_gf_invoke_lookup(jl_value_t *types, size_t world)
 jl_value_t *jl_gf_invoke(jl_value_t *types0, jl_value_t **args, size_t nargs)
 {
     size_t world = jl_get_ptls_states()->world_age;
-    jl_svec_t *tpenv = jl_emptysvec;
-    jl_tupletype_t *tt = NULL;
     jl_value_t *types = NULL;
-    JL_GC_PUSH3(&types, &tpenv, &tt);
+    JL_GC_PUSH1(&types);
     jl_value_t *gf = args[0];
     types = jl_argtype_with_function(gf, types0);
-    jl_methtable_t *mt = jl_gf_mtable(gf);
     jl_typemap_entry_t *entry = (jl_typemap_entry_t*)jl_gf_invoke_lookup(types, world);
 
     if ((jl_value_t*)entry == jl_nothing) {
@@ -2228,10 +2205,19 @@ jl_value_t *jl_gf_invoke(jl_value_t *types0, jl_value_t **args, size_t nargs)
 
     // now we have found the matching definition.
     // next look for or create a specialization of this definition.
+    JL_GC_POP();
+    return jl_gf_invoke_by_method(entry->func.method, args, nargs);
+}
 
-    jl_method_t *method = entry->func.method;
+jl_value_t *jl_gf_invoke_by_method(jl_method_t *method, jl_value_t **args, size_t nargs)
+{
+    size_t world = jl_get_ptls_states()->world_age;
     jl_method_instance_t *mfunc = NULL;
     jl_typemap_entry_t *tm = NULL;
+    jl_methtable_t *mt = jl_gf_mtable(args[0]);
+    jl_svec_t *tpenv = jl_emptysvec;
+    jl_tupletype_t *tt = NULL;
+    JL_GC_PUSH2(&tpenv, &tt);
     if (method->invokes.unknown != NULL)
         tm = jl_typemap_assoc_exact(method->invokes, args, nargs, jl_cachearg_offset(mt), world);
     if (tm) {
@@ -2248,7 +2234,7 @@ jl_value_t *jl_gf_invoke(jl_value_t *types0, jl_value_t **args, size_t nargs)
         if (method->invokes.unknown == NULL)
             method->invokes.unknown = jl_nothing;
 
-        mfunc = cache_method(mt, &method->invokes, entry->func.value, tt, method, world, tpenv, 1);
+        mfunc = cache_method(mt, &method->invokes, (jl_value_t*)method, tt, method, world, tpenv, 1);
         JL_UNLOCK(&method->writelock);
     }
     JL_GC_POP();
@@ -2303,6 +2289,33 @@ JL_DLLEXPORT jl_value_t *jl_get_invoke_lambda(jl_methtable_t *mt,
     return (jl_value_t*)mfunc;
 }
 
+JL_DLLEXPORT jl_value_t *jl_invoke(jl_method_instance_t *meth, jl_value_t **args, uint32_t nargs)
+{
+    jl_callptr_t fptr = meth->invoke;
+    if (fptr != jl_fptr_trampoline) {
+        return fptr(meth, args, nargs);
+    }
+    else {
+        // if this hasn't been inferred (compiled) yet,
+        // inferring it might not be able to handle the world range
+        // so we just do a generic apply here
+        // because that might actually be faster
+        // since it can go through the unrolled caches for this world
+        // and if inference is successful, this meth would get updated anyways,
+        // and we'll get the fast path here next time
+
+        jl_method_instance_t *mfunc = jl_lookup_generic_(args, nargs,
+                                                         jl_int32hash_fast(jl_return_address()),
+                                                         jl_get_ptls_states()->world_age);
+        // check whether `jl_apply_generic` would call the right method
+        if (mfunc->def.method == meth->def.method)
+            return mfunc->invoke(mfunc, args, nargs);
+
+        // no; came from an `invoke` call
+        return jl_gf_invoke_by_method(meth->def.method, args, nargs);
+    }
+}
+
 // Return value is rooted globally
 jl_function_t *jl_new_generic_function_with_supertype(jl_sym_t *name, jl_module_t *module, jl_datatype_t *st, int iskw)
 {

test/core.jl

@@ -2432,6 +2432,20 @@ const T24460 = Tuple{T,T} where T
 g24460() = invoke(f24460, T24460, 1, 2)
 @test @inferred(g24460()) === 2.0
 
+# issue #30679
+@noinline function f30679(::DataType)
+    b = IOBuffer()
+    write(b, 0x00)
+    2
+end
+@noinline function f30679(t::Type{Int})
+    x = invoke(f30679, Tuple{DataType}, t)
+    b = IOBuffer()
+    write(b, 0x00)
+    return x + 40
+end
+@test f30679(Int) == 42
+
 call_lambda1() = (()->x)(1)
 call_lambda2() = ((x)->x)()
 call_lambda3() = ((x)->x)(1,2)