From c4e648430f3c5c135310f87280d45dba581aaa7b Mon Sep 17 00:00:00 2001 From: Stephen Crane Date: Mon, 11 Dec 2017 14:58:38 -0800 Subject: Add plugin API for processing plugin-added input files Gold plugins may wish to further process an input file added by a plugin. For example, the plugin may need to assign a unique segment for sections in a plugin-generated input file. This patch adds a plugin callback that the linker will call when reading symbols from a new input file added after the all_symbols_read event (i.e. an input file added by a plugin). 2017-12-11 Stephen Crane * plugin-api.h: Add new plugin hook to allow processing of input files added by a plugin. (ld_plugin_new_input_handler): New function hook type. (ld_plugin_register_new_input): New interface. (LDPT_REGISTER_NEW_INPUT_HOOK): New enum val. (tv_register_new_input): New member. * plugin.cc (Plugin::load): Include hooks for register_new_input in transfer vector. (Plugin::new_input): New function. (register_new_input): New function. (Plugin_manager::claim_file): Call Plugin::new_input if in replacement phase. * plugin.h (Plugin::set_new_input_handler): New function. * testsuite/plugin_new_section_layout.c: New plugin to test new_input plugin API. * testsuite/plugin_final_layout.sh: Add new input test. * testsuite/Makefile.am (plugin_layout_new_file): New test case. * testsuite/Makefile.in: Regenerate. --- include/plugin-api.h | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) (limited to 'include/plugin-api.h') diff --git a/include/plugin-api.h b/include/plugin-api.h index 3a3e8b4..f081f85 100644 --- a/include/plugin-api.h +++ b/include/plugin-api.h @@ -365,6 +365,20 @@ enum ld_plugin_status (*ld_plugin_get_input_section_size) (const struct ld_plugin_section section, uint64_t *secsize); +typedef +enum ld_plugin_status +(*ld_plugin_new_input_handler) (const struct ld_plugin_input_file *file); + +/* The linker's interface for registering the "new_input" handler. This handler + will be notified when a new input file has been added after the + all_symbols_read event, allowing the plugin to, for example, set a unique + segment for sections in plugin-generated input files. */ + +typedef +enum ld_plugin_status +(*ld_plugin_register_new_input) (ld_plugin_new_input_handler handler); + + enum ld_plugin_level { LDPL_INFO, @@ -407,7 +421,8 @@ enum ld_plugin_tag LDPT_UNIQUE_SEGMENT_FOR_SECTIONS = 27, LDPT_GET_SYMBOLS_V3 = 28, LDPT_GET_INPUT_SECTION_ALIGNMENT = 29, - LDPT_GET_INPUT_SECTION_SIZE = 30 + LDPT_GET_INPUT_SECTION_SIZE = 30, + LDPT_REGISTER_NEW_INPUT_HOOK = 31 }; /* The plugin transfer vector. */ @@ -441,6 +456,7 @@ struct ld_plugin_tv ld_plugin_unique_segment_for_sections tv_unique_segment_for_sections; ld_plugin_get_input_section_alignment tv_get_input_section_alignment; ld_plugin_get_input_section_size tv_get_input_section_size; + ld_plugin_register_new_input tv_register_new_input; } tv_u; }; -- cgit v1.1