handle errors in calling code_reflections methods on non-generic func…

…tions

fix #15606

base/reflection.jl

@@ -325,6 +325,9 @@ uncompressed_ast(l::LambdaInfo) =
 # Printing code representations in IR and assembly
 function _dump_function(f, t::ANY, native, wrapper, strip_ir_metadata, dump_module)
     ccall(:jl_is_in_pure_context, Bool, ()) && error("native reflection cannot be used from generated functions")
+    if isa(f, Core.Builtin)
+        throw(ArgumentError("argument is not a generic function"))
+    end
     t = tt_cons(Core.Typeof(f), to_tuple_type(t))
     llvmf = ccall(:jl_get_llvmf, Ptr{Void}, (Any, Bool, Bool), t, wrapper, native)
 
@@ -363,6 +366,9 @@ end
 
 function code_typed(f::ANY, types::ANY=Tuple; optimize=true)
     ccall(:jl_is_in_pure_context, Bool, ()) && error("code reflection cannot be used from generated functions")
+    if isa(f, Core.Builtin)
+        throw(ArgumentError("argument is not a generic function"))
+    end
     types = to_tuple_type(types)
     asts = []
     for x in _methods(f,types,-1)
@@ -380,6 +386,9 @@ end
 
 function return_types(f::ANY, types::ANY=Tuple)
     ccall(:jl_is_in_pure_context, Bool, ()) && error("code reflection cannot be used from generated functions")
+    if isa(f, Core.Builtin)
+        throw(ArgumentError("argument is not a generic function"))
+    end
     types = to_tuple_type(types)
     rt = []
     for x in _methods(f,types,-1)

src/codegen.cpp

@@ -1058,9 +1058,16 @@ void *jl_get_llvmf(jl_tupletype_t *tt, bool getwrapper, bool getdeclarations)
         }
     }
     if (linfo == NULL) {
+        // no function found for argument tuple type
         JL_GC_POP();
         return NULL;
     }
+    if (linfo->def->lambda_template->code == jl_nothing) {
+        // not a generic function
+        JL_GC_POP();
+        return NULL;
+    }
+
     // make sure to compile this normally first,
     // since `emit_function` doesn't handle recursive compilation correctly
     linfo = jl_compile_for_dispatch(linfo);

test/reflection.jl

@@ -218,6 +218,10 @@ let
 end
 
 @test_throws ArgumentError which(is, Tuple{Int, Int})
+@test_throws ArgumentError code_typed(is, Tuple{Int, Int})
+@test_throws ArgumentError code_llvm(is, Tuple{Int, Int})
+@test_throws ArgumentError code_native(is, Tuple{Int, Int})
+@test_throws ArgumentError Base.return_types(is, Tuple{Int, Int})
 
 module TestingExported
 using Base.Test