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0aadf60359d4e69f14dc27e30e3eb0c4ff383d18
raddebugger/src/linker/lnk_symbol_table.c
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// Copyright (c) 2025 Epic Games Tools
// Licensed under the MIT license (https://opensource.org/license/mit/)
internal LNK_Symbol *
lnk_make_defined_symbol(Arena *arena, String8 name, struct LNK_Obj *obj, U32 symbol_idx)
{
LNK_Symbol *symbol = push_array(arena, LNK_Symbol, 1);
symbol->name = name;
symbol->type = LNK_Symbol_Defined;
symbol->u.defined.obj = obj;
symbol->u.defined.symbol_idx = symbol_idx;
return symbol;
}
internal LNK_Symbol *
lnk_make_lib_symbol(Arena *arena, String8 name, struct LNK_Lib *lib, U64 member_offset)
{
LNK_Symbol *symbol = push_array(arena, LNK_Symbol, 1);
symbol->name = name;
symbol->type = LNK_Symbol_Lib;
symbol->u.lib.lib = lib;
symbol->u.lib.member_offset = member_offset;
return symbol;
}
internal LNK_Symbol *
lnk_make_undefined_symbol(Arena *arena, String8 name, struct LNK_Obj *obj)
{
LNK_Symbol *symbol = push_array(arena, LNK_Symbol, 1);
symbol->name = name;
symbol->type = LNK_Symbol_Undefined;
symbol->u.undef.obj = obj;
return symbol;
}
internal LNK_Symbol *
lnk_make_import_symbol(Arena *arena, String8 name, String8 import_header)
{
LNK_Symbol *symbol = push_array(arena, LNK_Symbol, 1);
symbol->name = name;
symbol->type = LNK_Symbol_Import;
symbol->u.import.import_header = import_header;
return symbol;
}
internal void
lnk_symbol_list_push_node(LNK_SymbolList *list, LNK_SymbolNode *node)
{
SLLQueuePush(list->first, list->last, node);
list->count += 1;
}
internal LNK_SymbolNode *
lnk_symbol_list_push(Arena *arena, LNK_SymbolList *list, LNK_Symbol *symbol)
{
LNK_SymbolNode *node = push_array(arena, LNK_SymbolNode, 1);
node->data = symbol;
lnk_symbol_list_push_node(list, node);
return node;
}
internal void
lnk_symbol_list_concat_in_place(LNK_SymbolList *list, LNK_SymbolList *to_concat)
{
SLLConcatInPlace(list, to_concat);
}
internal LNK_SymbolList
lnk_symbol_list_from_array(Arena *arena, LNK_SymbolArray arr)
{
LNK_SymbolList list = {0};
LNK_SymbolNode *node_arr = push_array_no_zero(arena, LNK_SymbolNode, arr.count);
for (U64 i = 0; i < arr.count; i += 1) {
LNK_SymbolNode *node = &node_arr[i];
node->next = 0;
node->data = &arr.v[i];
lnk_symbol_list_push_node(&list, node);
}
return list;
}
internal LNK_SymbolNodeArray
lnk_symbol_node_array_from_list(Arena *arena, LNK_SymbolList list)
{
LNK_SymbolNodeArray result = {0};
result.count = 0;
result.v = push_array_no_zero(arena, LNK_SymbolNode *, list.count);
for (LNK_SymbolNode *i = list.first; i != 0; i = i->next, ++result.count) {
result.v[result.count] = i;
}
return result;
}
internal LNK_SymbolArray
lnk_symbol_array_from_list(Arena *arena, LNK_SymbolList list)
{
LNK_SymbolArray arr = {0};
arr.count = 0;
arr.v = push_array_no_zero(arena, LNK_Symbol, list.count);
for (LNK_SymbolNode *node = list.first; node != 0; node = node->next) {
arr.v[arr.count++] = *node->data;
}
return arr;
}
internal LNK_SymbolHashTrie *
lnk_symbol_hash_trie_chunk_list_push(Arena *arena, LNK_SymbolHashTrieChunkList *list, U64 cap)
{
if (list->last == 0 || list->last->count >= list->last->cap) {
LNK_SymbolHashTrieChunk *chunk = push_array(arena, LNK_SymbolHashTrieChunk, 1);
chunk->cap = cap;
chunk->v = push_array_no_zero(arena, LNK_SymbolHashTrie, cap);
SLLQueuePush(list->first, list->last, chunk);
++list->count;
}
LNK_SymbolHashTrie *result = &list->last->v[list->last->count++];
return result;
}
internal void
lnk_error_multiply_defined_symbol(LNK_Symbol *dst, LNK_Symbol *src)
{
lnk_error_obj(LNK_Error_MultiplyDefinedSymbol, dst->u.defined.obj, "symbol \"%S\" (No. %#x) is multiply defined in %S (No. %#x)", dst->name, dst->u.defined.symbol_idx, src->u.defined.obj->path, src->u.defined.symbol_idx);
}
internal B32
lnk_can_replace_symbol(LNK_Symbol *dst, LNK_Symbol *src)
{
Assert(src->type != LNK_Symbol_Undefined);
Assert(dst != src);
Assert(str8_match(dst->name, src->name, 0));
B32 can_replace = 0;
// lib vs lib
if (dst->type == LNK_Symbol_Lib && src->type == LNK_Symbol_Lib) {
// link.exe picks symbol from lib that is discovered first
can_replace = src->u.lib.lib->input_idx < dst->u.lib.lib->input_idx;
}
else if (dst->type == LNK_Symbol_Import) {
AssertAlways(src->type != LNK_Symbol_Import);
can_replace = 1;
}
// defined vs defined
else if (dst->type == LNK_Symbol_Defined && src->type == LNK_Symbol_Defined) {
LNK_Obj *dst_obj = dst->u.defined.obj;
LNK_Obj *src_obj = src->u.defined.obj;
COFF_ParsedSymbol dst_parsed = lnk_parsed_symbol_from_coff_symbol_idx(dst->u.defined.obj, dst->u.defined.symbol_idx);
COFF_ParsedSymbol src_parsed = lnk_parsed_symbol_from_coff_symbol_idx(src->u.defined.obj, src->u.defined.symbol_idx);
COFF_SymbolValueInterpType dst_interp = coff_interp_symbol(dst_parsed.section_number, dst_parsed.value, dst_parsed.storage_class);
COFF_SymbolValueInterpType src_interp = coff_interp_symbol(src_parsed.section_number, src_parsed.value, src_parsed.storage_class);
if (dst_interp == COFF_SymbolValueInterp_Regular && src_interp == COFF_SymbolValueInterp_Abs) {
lnk_error_multiply_defined_symbol(dst, src);
}
// abs vs regular
else if ((dst_interp == COFF_SymbolValueInterp_Abs && src_interp == COFF_SymbolValueInterp_Regular) ||
(dst_interp == COFF_SymbolValueInterp_Regular && src_interp == COFF_SymbolValueInterp_Abs)) {
lnk_error_multiply_defined_symbol(dst, src);
}
// abs vs common
else if (dst_interp == COFF_SymbolValueInterp_Abs && src_interp == COFF_SymbolValueInterp_Common) {
if (dst->u.defined.obj->input_idx < src->u.defined.obj->input_idx) {
can_replace = 1;
} else {
lnk_error_multiply_defined_symbol(dst, src);
}
}
// common vs abs
else if (dst_interp == COFF_SymbolValueInterp_Common && src_interp == COFF_SymbolValueInterp_Abs) {
if (dst->u.defined.obj->input_idx < src->u.defined.obj->input_idx) {
lnk_error_multiply_defined_symbol(dst, src);
}
}
// weak vs weak
else if (dst_interp == COFF_SymbolValueInterp_Weak && src_interp == COFF_SymbolValueInterp_Weak) {
}
// weak vs abs
else if (dst_interp == COFF_SymbolValueInterp_Weak && src_interp == COFF_SymbolValueInterp_Abs) {
can_replace = 1;
}
// abs vs weak
else if (dst_interp == COFF_SymbolValueInterp_Abs && src_interp == COFF_SymbolValueInterp_Weak) {
can_replace = 0;
}
// weak vs (regular, common, abs)
else if (dst_interp == COFF_SymbolValueInterp_Weak && (src_interp == COFF_SymbolValueInterp_Regular || src_interp == COFF_SymbolValueInterp_Common || src_interp == COFF_SymbolValueInterp_Abs)) {
can_replace = 1;
}
// regular vs weak
else if (dst_interp == COFF_SymbolValueInterp_Regular && src_interp == COFF_SymbolValueInterp_Weak) {
can_replace = 0;
}
// (regular, common) vs (regular, common)
else if ((dst_interp == COFF_SymbolValueInterp_Regular || dst_interp == COFF_SymbolValueInterp_Common) && (src_interp == COFF_SymbolValueInterp_Regular || src_interp == COFF_SymbolValueInterp_Common)) {
B32 dst_is_comdat = 0;
COFF_ComdatSelectType dst_select;
U32 dst_section_length;
U32 dst_check_sum;
if (dst_interp == COFF_SymbolValueInterp_Regular) {
U32 dst_comdat_symbol_idx = dst_obj->comdats[dst_parsed.section_number-1];
if (dst_comdat_symbol_idx != max_U32) {
COFF_ParsedSymbol secdef = lnk_parsed_symbol_from_coff_symbol_idx(dst_obj, dst_comdat_symbol_idx);
coff_parse_secdef(secdef, dst_obj->header.is_big_obj, &dst_select, 0, &dst_section_length, &dst_check_sum);
dst_is_comdat = 1;
}
} else if (dst_interp == COFF_SymbolValueInterp_Common) {
dst_select = COFF_ComdatSelect_Largest;
dst_section_length = dst_parsed.value;
dst_check_sum = 0;
dst_is_comdat = 1;
}
B32 src_is_comdat = 0;
COFF_ComdatSelectType src_select;
U32 src_section_length;
U32 src_check_sum;
if (src_interp == COFF_SymbolValueInterp_Regular) {
U32 src_comdat_symbol_idx = src_obj->comdats[src_parsed.section_number-1];
if (src_comdat_symbol_idx != max_U32) {
COFF_ParsedSymbol secdef = lnk_parsed_symbol_from_coff_symbol_idx(src_obj, src_comdat_symbol_idx);
coff_parse_secdef(secdef, src_obj->header.is_big_obj, &src_select, 0, &src_section_length, &src_check_sum);
src_is_comdat = 1;
}
} else if (src_interp == COFF_SymbolValueInterp_Common) {
src_select = COFF_ComdatSelect_Largest;
src_section_length = src_parsed.value;
src_check_sum = 0;
src_is_comdat = 1;
}
// regular non-comdat vs communal
if (dst_interp == COFF_SymbolValueInterp_Regular && !dst_is_comdat &&
src_interp == COFF_SymbolValueInterp_Common) {
can_replace = 0;
}
// communal vs regular non-comdat
else if (dst_interp == COFF_SymbolValueInterp_Common &&
src_interp == COFF_SymbolValueInterp_Regular && !src_is_comdat) {
can_replace = 1;
}
// handle COMDATs
else if (dst_is_comdat && src_is_comdat) {
// handle objs compiled with /GR- and /GR
if ((src_select == COFF_ComdatSelect_Any && dst_select == COFF_ComdatSelect_Largest)) {
src_select = COFF_ComdatSelect_Largest;
}
if (src_select == COFF_ComdatSelect_Largest && dst_select == COFF_ComdatSelect_Any) {
dst_select = COFF_ComdatSelect_Largest;
}
if (src_select == dst_select) {
switch (src_select) {
case COFF_ComdatSelect_Null:
case COFF_ComdatSelect_Any: {
if (src_section_length == dst_section_length) {
can_replace = src_obj->input_idx < dst_obj->input_idx;
} else {
// both COMDATs are valid but to get smaller exe pick smallest
can_replace = src_section_length < dst_section_length;
}
} break;
case COFF_ComdatSelect_NoDuplicates: {
lnk_error_multiply_defined_symbol(dst, src);
} break;
case COFF_ComdatSelect_SameSize: {
if (dst_section_length == src_section_length) {
can_replace = src_obj->input_idx < dst_obj->input_idx;
} else {
lnk_error_multiply_defined_symbol(dst, src);
}
} break;
case COFF_ComdatSelect_ExactMatch: {
COFF_SectionHeader *dst_section_table = (COFF_SectionHeader *)str8_substr(dst_obj->data, dst_obj->header.section_table_range).str;
COFF_SectionHeader *src_section_table = (COFF_SectionHeader *)str8_substr(src_obj->data, src_obj->header.section_table_range).str;
COFF_SectionHeader *dst_sect_header = &dst_section_table[dst_parsed.section_number-1];
COFF_SectionHeader *src_sect_header = &src_section_table[src_parsed.section_number-1];
String8 dst_data = str8_substr(dst_obj->data, rng_1u64(dst_sect_header->foff, dst_sect_header->foff + dst_sect_header->fsize));
String8 src_data = str8_substr(src_obj->data, rng_1u64(src_sect_header->foff, src_sect_header->foff + src_sect_header->fsize));
B32 is_exact_match = 0;
if (dst_check_sum != 0 && src_check_sum != 0) {
is_exact_match = dst_check_sum == src_check_sum && str8_match(dst_data, src_data, 0);
} else {
is_exact_match = str8_match(dst_data, src_data, 0);
}
if (is_exact_match) {
can_replace = src_obj->input_idx < dst_obj->input_idx;
} else {
lnk_error_multiply_defined_symbol(dst, src);
}
} break;
case COFF_ComdatSelect_Largest: {
if (dst_section_length == src_section_length) {
can_replace = src_obj->input_idx < dst_obj->input_idx;
} else {
can_replace = dst_section_length < src_section_length;
}
} break;
case COFF_ComdatSelect_Associative: {
// ignore
} break;
default: { InvalidPath; }
}
} else {
String8 src_select_str = coff_string_from_comdat_select_type(src_select);
String8 dst_select_str = coff_string_from_comdat_select_type(dst_select);
lnk_error_obj(LNK_Warning_UnresolvedComdat, src_obj,
"%S: COMDAT selection conflict detected, current selection %S, leader selection %S from %S",
src->name, src_select_str, dst_select_str, dst_obj);
}
} else {
lnk_error_multiply_defined_symbol(dst, src);
}
} else {
lnk_error(LNK_Error_InvalidPath, "unable to find a suitable replacement logic for symbol combination");
}
} else {
lnk_error(LNK_Error_InvalidPath, "unable to find a suitable replacement logic for symbol combination");
}
return can_replace;
}
internal void
lnk_on_symbol_replace(LNK_Symbol *dst, LNK_Symbol *src)
{
Assert(dst != src);
if (dst->type == LNK_Symbol_Lib && src->type == LNK_Symbol_Lib) {
dst->u.lib = src->u.lib;
} else if (dst->type == LNK_Symbol_Defined && src->type == LNK_Symbol_Defined) {
COFF_ParsedSymbol dst_parsed = lnk_parsed_symbol_from_coff_symbol_idx(dst->u.defined.obj, dst->u.defined.symbol_idx);
COFF_ParsedSymbol src_parsed = lnk_parsed_symbol_from_coff_symbol_idx(src->u.defined.obj, src->u.defined.symbol_idx);
COFF_SymbolValueInterpType dst_interp = coff_interp_symbol(dst_parsed.section_number, dst_parsed.value, dst_parsed.storage_class);
COFF_SymbolValueInterpType src_interp = coff_interp_symbol(src_parsed.section_number, src_parsed.value, src_parsed.storage_class);
if (dst_interp == COFF_SymbolValueInterp_Regular) {
COFF_SectionHeader *dst_sect = lnk_coff_section_header_from_section_number(dst->u.defined.obj, dst_parsed.section_number);
dst_sect->flags |= COFF_SectionFlag_LnkRemove;
dst->u.defined = src->u.defined;
}
if (src_interp == COFF_SymbolValueInterp_Regular) {
COFF_SectionHeader *src_sect = lnk_coff_section_header_from_section_number(src->u.defined.obj, src_parsed.section_number);
AssertAlways(~src_sect->flags & COFF_SectionFlag_LnkRemove);
}
} else {
InvalidPath;
}
}
internal void
lnk_symbol_hash_trie_insert_or_replace(Arena *arena,
LNK_SymbolHashTrieChunkList *chunks,
LNK_SymbolHashTrie **trie,
U64 hash,
LNK_Symbol *symbol)
{
LNK_SymbolHashTrie **curr_trie_ptr = trie;
for (U64 h = hash; ; h <<= 2) {
// load current pointer
LNK_SymbolHashTrie *curr_trie = ins_atomic_ptr_eval(curr_trie_ptr);
if (curr_trie == 0) {
// init node
LNK_SymbolHashTrie *new_trie = lnk_symbol_hash_trie_chunk_list_push(arena, chunks, 512);
new_trie->name = &symbol->name;
new_trie->symbol = symbol;
MemoryZeroArray(new_trie->child);
// try to insert new node
LNK_SymbolHashTrie *cmp = ins_atomic_ptr_eval_cond_assign(curr_trie_ptr, new_trie, curr_trie);
// was symbol inserted?
if (cmp == curr_trie) {
break;
}
// rollback chunk list push
--chunks->last->count;
// retry insert with trie node from another thread
curr_trie = cmp;
}
// load current symbol
String8 *curr_name = ins_atomic_ptr_eval(&curr_trie->name);
if (curr_name && str8_match(*curr_name, symbol->name, 0)) {
for (LNK_Symbol *src = symbol;;) {
// try replacing current symbol with zero, otherwise loop back and retry
LNK_Symbol *leader = ins_atomic_ptr_eval_assign(&curr_trie->symbol, 0);
// apply replacement
if (leader) {
if (lnk_can_replace_symbol(leader, src)) {
// discard leader
lnk_on_symbol_replace(leader, src);
leader = src;
} else {
// discard source
lnk_on_symbol_replace(src, leader);
src = leader;
}
} else {
leader = src;
}
// try replacing symbol, if another thread has already taken the slot, rerun replacement loop again
LNK_Symbol *was_replaced = ins_atomic_ptr_eval_cond_assign(&curr_trie->symbol, leader, 0);
// symbol replaced, exit
if (was_replaced == 0) {
goto exit;
}
}
}
// pick child and descend
curr_trie_ptr = curr_trie->child + (h >> 62);
}
exit:;
}
internal LNK_SymbolHashTrie *
lnk_symbol_hash_trie_search(LNK_SymbolHashTrie *trie, U64 hash, String8 name)
{
LNK_SymbolHashTrie *result = 0;
LNK_SymbolHashTrie **curr_ptr = &trie;
for (U64 h = hash; ; h <<= 2) {
LNK_SymbolHashTrie *curr = ins_atomic_ptr_eval(curr_ptr);
if (curr == 0) {
break;
}
if (curr->name && str8_match(*curr->name, name, 0)) {
result = curr;
break;
}
curr_ptr = curr->child + (h >> 62);
}
return result;
}
internal void
lnk_symbol_hash_trie_remove(LNK_SymbolHashTrie *trie)
{
ins_atomic_ptr_eval_assign(&trie->name, 0);
ins_atomic_ptr_eval_assign(&trie->symbol, 0);
}
internal U64
lnk_symbol_hash(String8 string)
{
XXH3_state_t hasher; XXH3_64bits_reset(&hasher);
XXH3_64bits_update(&hasher, &string.size, sizeof(string.size));
XXH3_64bits_update(&hasher, string.str, string.size);
XXH64_hash_t result = XXH3_64bits_digest(&hasher);
return result;
}
internal LNK_SymbolTable *
lnk_symbol_table_init(TP_Arena *arena)
{
LNK_SymbolTable *symtab = push_array(arena->v[0], LNK_SymbolTable, 1);
symtab->arena = arena;
for (U64 i = 0; i < LNK_SymbolScope_Count; ++i) {
symtab->chunk_lists[i] = push_array(arena->v[0], LNK_SymbolHashTrieChunkList, arena->count);
}
symtab->alt_names = hash_table_init(arena->v[0], 1024);
return symtab;
}
internal LNK_Symbol *
lnk_symbol_table_search_hash(LNK_SymbolTable *symtab, LNK_SymbolScope scope, U64 hash, String8 name)
{
LNK_SymbolHashTrie *trie = lnk_symbol_hash_trie_search(symtab->scopes[scope], hash, name);
if (trie == 0) {
String8 alt_name = {0};
if (hash_table_search_string_string(symtab->alt_names, name, &alt_name)) {
U64 alt_hash = lnk_symbol_hash(alt_name);
trie = lnk_symbol_hash_trie_search(symtab->scopes[scope], alt_hash, alt_name);
}
}
return trie ? trie->symbol : 0;
}
internal LNK_Symbol *
lnk_symbol_table_search(LNK_SymbolTable *symtab, LNK_SymbolScope scope, String8 name)
{
U64 hash = lnk_symbol_hash(name);
return lnk_symbol_table_search_hash(symtab, scope, hash, name);
}
internal LNK_Symbol *
lnk_symbol_table_searchf(LNK_SymbolTable *symtab, LNK_SymbolScope scope, char *fmt, ...)
{
Temp scratch = scratch_begin(0, 0);
va_list args;
va_start(args, fmt);
String8 name = push_str8fv(scratch.arena, fmt, args);
va_end(args);
LNK_Symbol *symbol = lnk_symbol_table_search(symtab, scope, name);
scratch_end(scratch);
return symbol;
}
internal void
lnk_symbol_table_push_(LNK_SymbolTable *symtab, Arena *arena, U64 worker_id, LNK_SymbolScope scope, U64 hash, LNK_Symbol *symbol)
{
lnk_symbol_hash_trie_insert_or_replace(arena, &symtab->chunk_lists[scope][worker_id], &symtab->scopes[scope], hash, symbol);
}
internal void
lnk_symbol_table_push_hash(LNK_SymbolTable *symtab, U64 hash, LNK_Symbol *symbol)
{
switch (symbol->type) {
case LNK_Symbol_Null: break;
case LNK_Symbol_Defined: { lnk_symbol_table_push_(symtab, symtab->arena->v[0], 0, LNK_SymbolScope_Defined, hash, symbol); } break;
case LNK_Symbol_Import: { lnk_symbol_table_push_(symtab, symtab->arena->v[0], 0, LNK_SymbolScope_Import, hash, symbol); } break;
case LNK_Symbol_Lib: { lnk_symbol_table_push_(symtab, symtab->arena->v[0], 0, LNK_SymbolScope_Lib, hash, symbol); } break;
default: { InvalidPath; } break;
}
}
internal void
lnk_symbol_table_push(LNK_SymbolTable *symtab, LNK_Symbol *symbol)
{
U64 hash = lnk_symbol_hash(symbol->name);
lnk_symbol_table_push_hash(symtab, hash, symbol);
}
internal void
lnk_symbol_table_remove(LNK_SymbolTable *symtab, LNK_SymbolScope scope, String8 name)
{
U64 hash = lnk_symbol_hash(name);
LNK_SymbolHashTrie *trie = lnk_symbol_hash_trie_search(symtab->scopes[scope], hash, name);
if (trie) {
lnk_symbol_hash_trie_remove(trie);
}
}
internal void
lnk_symbol_table_push_alt_name(LNK_SymbolTable *symtab, LNK_Obj *obj, String8 from, String8 to)
{
String8 to_extant;
if (hash_table_search_string_string(symtab->alt_names, from, &to_extant)) {
if (!str8_match(to_extant, to, 0)) {
lnk_error_obj(LNK_Error_AlternateNameConflict, obj, "conflicting alternative name: existing '%S=%S' vs. new '%S=%S'", from, to_extant, from, to);
}
} else {
hash_table_push_string_string(symtab->arena->v[0], symtab->alt_names, from, to);
}
}
internal ISectOff
lnk_sc_from_symbol(LNK_Symbol *symbol)
{
COFF_ParsedSymbol parsed_symbol = lnk_parsed_symbol_from_coff_symbol_idx(symbol->u.defined.obj, symbol->u.defined.symbol_idx);
ISectOff sc = {0};
sc.isect = parsed_symbol.section_number;
sc.off = parsed_symbol.value;
return sc;
}
internal U64
lnk_isect_from_symbol(LNK_Symbol *symbol)
{
return lnk_sc_from_symbol(symbol).isect;
}
internal U64
lnk_sect_off_from_symbol(LNK_Symbol *symbol)
{
return lnk_sc_from_symbol(symbol).off;
}
internal U64
lnk_virt_off_from_symbol(COFF_SectionHeader **section_table, LNK_Symbol *symbol)
{
ISectOff sc = lnk_sc_from_symbol(symbol);
U64 voff = section_table[sc.isect]->voff + sc.off;
return voff;
}
internal U64
lnk_file_off_from_symbol(COFF_SectionHeader **section_table, LNK_Symbol *symbol)
{
ISectOff sc = lnk_sc_from_symbol(symbol);
U64 foff = section_table[sc.isect]->foff + sc.off;
return foff;
}
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