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Cider Isn't Darwin Emulation, Really
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C++
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105#include <stdlib.h>#include <darling/emulation/linux_premigration/ext/for-xtrace.h>#include "tls.h"#include "memory.h"#include "lock.h"#include <darling/emulation/common/simple.h>#include <pthread/tsd_private.h>#include "xtracelib.h"
#ifndef XTRACE_TLS_DEBUG #define XTRACE_TLS_DEBUG 0#endif
#if XTRACE_TLS_DEBUG #define xtrace_tls_debug(x, ...) xtrace_log(x "\n", ## __VA_ARGS__)#else #define xtrace_tls_debug(x, ...)#endif
// 32 TLS vars should be enough, right?#define TLS_TABLE_MAX_SIZE 32
typedef struct tls_table* tls_table_t;struct tls_table { size_t size; void* table[TLS_TABLE_MAX_SIZE][3];};
// since we still need to handle some calls after pthread_terminate is called and libpthread unwinds its TLS right before calling pthread_terminate,// we have to use a slightly hackier technique: using one of the system's reserved but unused TLS keys; we use one from the range we currently reserve// for Darling.
#include <darling/emulation/common/tsd.h>
// TODO: also perform TLS cleanup for other threads when doing a fork
extern "C"void xtrace_tls_thread_cleanup(void) { tls_table_t table = (tls_table_t)_pthread_getspecific_direct(__PTK_DARLING_XTRACE_TLS); if (!table) { xtrace_tls_debug("no table to cleanup for this thread"); return; } xtrace_tls_debug("destroying table %p", table); for (size_t i = 0; i < table->size; ++i) { if (table->table[i][2]) { xtrace_tls_debug("destroying value %p for key %p", table->table[i][1], table->table[i][0]); ((xtrace_tls_destructor_f)table->table[i][2])(table->table[1]); } xtrace_tls_debug("freeing value %p for key %p", table->table[i][1], table->table[i][0]); xtrace_free(table->table[i][1]); } xtrace_tls_debug("freeing table %p", table); xtrace_free(table);};
extern "C"void* xtrace_tls(void* key, size_t size, bool* created, xtrace_tls_destructor_f destructor) { xtrace_tls_debug("looking up tls variable for key %p", key);
tls_table_t table = (tls_table_t)_pthread_getspecific_direct(__PTK_DARLING_XTRACE_TLS);
xtrace_tls_debug("got %p as table pointer from pthread", table);
// if the table doesn't exist yet, create it if (table == NULL) { xtrace_tls_debug("table is NULL, creating now..."); table = (tls_table_t)xtrace_malloc(sizeof(struct tls_table)); if (table == NULL) { xtrace_abort("xtrace: failed TLS table memory allocation"); } table->size = 0; _pthread_setspecific_direct(__PTK_DARLING_XTRACE_TLS, table); }
// check if the key is already present for (size_t i = 0; i < table->size; ++i) { if (table->table[i][0] == key) { xtrace_tls_debug("found entry in table for key %p with value %p", key, table->table[i][1]); if (created) { *created = false; } return table->table[i][1]; } }
// otherwise, create it xtrace_tls_debug("creating new entry in table for key %p", key); size_t index = table->size++; if (index >= TLS_TABLE_MAX_SIZE) { xtrace_abort("xtrace: too many TLS variables"); } table->table[index][0] = key; table->table[index][1] = xtrace_malloc(size); table->table[index][2] = (void*)destructor; if (table->table[index][1] == NULL) { xtrace_abort("xtrace: failed TLS variable memory allocation"); } xtrace_tls_debug("new table entry created for key %p with value %p", key, table->table[index][1]); if (created) { *created = true; } return table->table[index][1];};