From: Elysia Witham <elysia.wit...@ll.mit.edu> Plugins can export functions or import functions from other plugins using their name and the function name. This is also described in <qemu-plugin.h>.
Signed-off-by: Elysia Witham <elysia.wit...@ll.mit.edu> Signed-off-by: Andrew Fasano <fas...@mit.edu> --- include/qemu/qemu-plugin.h | 10 ++++++++++ plugins/api.c | 21 +++++++++++++++++++++ plugins/qemu-plugins.symbols | 1 + 3 files changed, 32 insertions(+) diff --git a/include/qemu/qemu-plugin.h b/include/qemu/qemu-plugin.h index 4221545015..a0516e9a0e 100644 --- a/include/qemu/qemu-plugin.h +++ b/include/qemu/qemu-plugin.h @@ -354,6 +354,16 @@ size_t qemu_plugin_tb_n_insns(const struct qemu_plugin_tb *tb); */ uint64_t qemu_plugin_tb_vaddr(const struct qemu_plugin_tb *tb); +/** + * qemu_plugin_import_function() - return pointer to a function in another + * plugin + * @plugin: plugin name + * @function: function name + * + * Returns: NULL on failure, function pointer on success + */ +gpointer qemu_plugin_import_function(const char *plugin, const char *function); + /** * qemu_plugin_create_callback() - create a new cb with given name * @id: unique plugin id diff --git a/plugins/api.c b/plugins/api.c index 1f7ea718dc..a998df6942 100644 --- a/plugins/api.c +++ b/plugins/api.c @@ -400,6 +400,27 @@ bool qemu_plugin_bool_parse(const char *name, const char *value, bool *ret) return name && value && qapi_bool_parse(name, value, ret, NULL); } +/* + * QPP: inter-plugin function resolution and callbacks + */ + +gpointer qemu_plugin_import_function(const char *target_plugin, + const char *function) { + gpointer function_pointer = NULL; + struct qemu_plugin_ctx *ctx = plugin_name_to_ctx_locked(target_plugin); + if (ctx == NULL) { + error_report("Unable to load plugin %s by name", target_plugin); + } else if (g_module_symbol(ctx->handle, function, + (gpointer *)&function_pointer)) { + return function_pointer; + } else { + error_report("function: %s not found in plugin: %s", function, + target_plugin); + } + abort(); + return NULL; +} + bool qemu_plugin_create_callback(qemu_plugin_id_t id, const char *cb_name) { struct qemu_plugin_ctx *ctx = plugin_id_to_ctx_locked(id); diff --git a/plugins/qemu-plugins.symbols b/plugins/qemu-plugins.symbols index b7013980cf..70a518839d 100644 --- a/plugins/qemu-plugins.symbols +++ b/plugins/qemu-plugins.symbols @@ -3,6 +3,7 @@ qemu_plugin_end_code; qemu_plugin_entry_code; qemu_plugin_get_hwaddr; + qemu_plugin_import_function; qemu_plugin_create_callback; qemu_plugin_run_callback; qemu_plugin_reg_callback; -- 2.34.1