Segment fault c api (#490)

* fixed a bug in the cpp api for the case of zero input parameter

* clang format

* fixed clang format warning
Co-authored-by: Paul Fultz II <pfultz2@yahoo.com>
Co-authored-by: mvermeulen <5479696+mvermeulen@users.noreply.github.com>

src/api/include/migraphx/migraphx.hpp

@@ -344,7 +344,10 @@ struct program_parameter_shapes : MIGRAPHX_HANDLE_BASE(program_parameter_shapes)
     std::vector<const char*> names() const
     {
         std::vector<const char*> result(this->size());
+        if(!result.empty())
+        {
             call(&migraphx_program_parameter_shapes_names, result.data(), this->get_handle_ptr());
+        }
         return result;
     }
 };

test/api/test_cpu.cpp

@@ -22,4 +22,24 @@ TEST_CASE(load_and_run)
     CHECK(bool{shapes_before.front() == outputs.front().get_shape()});
 }
 
+TEST_CASE(zero_parameter)
+{
+    auto p             = migraphx::parse_onnx("constant_fill_test.onnx");
+    auto shapes_before = p.get_output_shapes();
+    p.compile(migraphx::target("cpu"));
+    auto shapes_after = p.get_output_shapes();
+    CHECK(shapes_before.size() == 1);
+    CHECK(shapes_before.size() == shapes_after.size());
+    CHECK(bool{shapes_before.front() == shapes_after.front()});
+    migraphx::program_parameters pp;
+    auto param_shapes = p.get_parameter_shapes();
+    for(auto&& name : param_shapes.names())
+    {
+        pp.add(name, migraphx::argument::generate(param_shapes[name]));
+    }
+    auto outputs = p.eval(pp);
+    CHECK(shapes_before.size() == outputs.size());
+    CHECK(bool{shapes_before.front() == outputs.front().get_shape()});
+}
+
 int main(int argc, const char* argv[]) { test::run(argc, argv); }