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make use of undocumented anti-dependency search property on weak symbols

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to implement alternate name using weak symbols
This commit is contained in:
Nikita Smith
2025-08-05 08:39:11 -07:00
committed by Ryan Fleury
parent 8d246d0c6a
commit c1958809eb
6 changed files with 123 additions and 41 deletions
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src/linker/lnk_config.c
+21 -6
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@@ -609,6 +609,7 @@ lnk_parse_alt_name_directive(String8 string, LNK_Obj *obj, LNK_AltName *alt_out)
if (pair.node_count == 2) {
alt_out->from = pair.first->string;
alt_out->to = pair.last->string;
alt_out->obj = obj;
is_parse_ok = 1;
} else {
lnk_error_cmd_switch(LNK_Error_Cmdl, obj, LNK_CmdSwitch_AlternateName, "syntax error in \"%S\", expected format \"FROM=TO\"", string);
@@ -1092,12 +1093,25 @@ lnk_apply_cmd_option_to_config(Arena *arena, LNK_Config *config, String8 cmd_nam
if (value_strings.node_count == 1) {
LNK_AltName alt_name;
if (lnk_parse_alt_name_directive(value_strings.first->string, obj, &alt_name)) {
alt_name.from = push_str8_copy(arena, alt_name.from);
alt_name.to = push_str8_copy(arena, alt_name.to);
LNK_AltNameNode *alt_name_n = push_array(arena, LNK_AltNameNode, 1);
alt_name_n->data = alt_name;
SLLQueuePush(config->alt_name_list.first, config->alt_name_list.last, alt_name_n);
config->alt_name_list.count += 1;
String8 to_extant = {0};
if (hash_table_search_string_string(config->alt_name_ht, alt_name.from, &to_extant)) {
if (str8_match(to_extant, alt_name.to, 0)) {
// ignore, duplicate
} else {
lnk_error_obj(LNK_Error_AlternateNameConflict, obj, "conflicting alternative name: existing '%S=%S' vs. new '%S=%S'", alt_name.from, to_extant, alt_name.from, alt_name.to);
}
} else {
hash_table_push_string_string(arena, config->alt_name_ht, alt_name.from, alt_name.to);
alt_name.from = push_str8_copy(arena, alt_name.from);
alt_name.to = push_str8_copy(arena, alt_name.to);
LNK_AltNameNode *alt_name_n = push_array(arena, LNK_AltNameNode, 1);
alt_name_n->data = alt_name;
SLLQueuePush(config->alt_name_list.first, config->alt_name_list.last, alt_name_n);
config->alt_name_list.count += 1;
}
}
} else {
lnk_error_cmd_switch(LNK_Error_Cmdl, obj, cmd_switch, "invalid number of parameters");
@@ -1973,6 +1987,7 @@ lnk_config_from_cmd_line(Arena *arena, String8List raw_cmd_line, LNK_CmdLine cmd
config->pdb_hash_type_name_length = 8;
config->data_dir_count = PE_DataDirectoryIndex_COUNT;
config->export_ht = hash_table_init(scratch.arena, max_U16/2);
config->alt_name_ht = hash_table_init(scratch.arena, 0x100);
// process command line switches
for (LNK_CmdOption *cmd = cmd_line.first_option; cmd != 0; cmd = cmd->next) {