diff options
Diffstat (limited to 'src/backend/tcop/postgres.c')
| -rw-r--r-- | src/backend/tcop/postgres.c | 173 |
1 files changed, 0 insertions, 173 deletions
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c index e0a603f42bb..3ce088f0bad 100644 --- a/src/backend/tcop/postgres.c +++ b/src/backend/tcop/postgres.c @@ -94,9 +94,6 @@ bool Log_disconnections = false; int log_statement = LOGSTMT_NONE; -/* GUC variable for maximum stack depth (measured in kilobytes) */ -int max_stack_depth = 100; - /* wait N seconds to allow attach from a debugger */ int PostAuthDelay = 0; @@ -124,15 +121,6 @@ typedef struct BindParamCbData * ---------------- */ -/* max_stack_depth converted to bytes for speed of checking */ -static long max_stack_depth_bytes = 100 * 1024L; - -/* - * Stack base pointer -- initialized by PostmasterMain and inherited by - * subprocesses (but see also InitPostmasterChild). - */ -static char *stack_base_ptr = NULL; - /* * Flag to keep track of whether we have started a transaction. * For extended query protocol this has to be remembered across messages. @@ -3514,133 +3502,6 @@ ProcessInterrupts(void) } /* - * set_stack_base: set up reference point for stack depth checking - * - * Returns the old reference point, if any. - */ -pg_stack_base_t -set_stack_base(void) -{ -#ifndef HAVE__BUILTIN_FRAME_ADDRESS - char stack_base; -#endif - pg_stack_base_t old; - - old = stack_base_ptr; - - /* - * Set up reference point for stack depth checking. On recent gcc we use - * __builtin_frame_address() to avoid a warning about storing a local - * variable's address in a long-lived variable. - */ -#ifdef HAVE__BUILTIN_FRAME_ADDRESS - stack_base_ptr = __builtin_frame_address(0); -#else - stack_base_ptr = &stack_base; -#endif - - return old; -} - -/* - * restore_stack_base: restore reference point for stack depth checking - * - * This can be used after set_stack_base() to restore the old value. This - * is currently only used in PL/Java. When PL/Java calls a backend function - * from different thread, the thread's stack is at a different location than - * the main thread's stack, so it sets the base pointer before the call, and - * restores it afterwards. - */ -void -restore_stack_base(pg_stack_base_t base) -{ - stack_base_ptr = base; -} - -/* - * check_stack_depth/stack_is_too_deep: check for excessively deep recursion - * - * This should be called someplace in any recursive routine that might possibly - * recurse deep enough to overflow the stack. Most Unixen treat stack - * overflow as an unrecoverable SIGSEGV, so we want to error out ourselves - * before hitting the hardware limit. - * - * check_stack_depth() just throws an error summarily. stack_is_too_deep() - * can be used by code that wants to handle the error condition itself. - */ -void -check_stack_depth(void) -{ - if (stack_is_too_deep()) - { - ereport(ERROR, - (errcode(ERRCODE_STATEMENT_TOO_COMPLEX), - errmsg("stack depth limit exceeded"), - errhint("Increase the configuration parameter \"max_stack_depth\" (currently %dkB), " - "after ensuring the platform's stack depth limit is adequate.", - max_stack_depth))); - } -} - -bool -stack_is_too_deep(void) -{ - char stack_top_loc; - long stack_depth; - - /* - * Compute distance from reference point to my local variables - */ - stack_depth = (long) (stack_base_ptr - &stack_top_loc); - - /* - * Take abs value, since stacks grow up on some machines, down on others - */ - if (stack_depth < 0) - stack_depth = -stack_depth; - - /* - * Trouble? - * - * The test on stack_base_ptr prevents us from erroring out if called - * during process setup or in a non-backend process. Logically it should - * be done first, but putting it here avoids wasting cycles during normal - * cases. - */ - if (stack_depth > max_stack_depth_bytes && - stack_base_ptr != NULL) - return true; - - return false; -} - -/* GUC check hook for max_stack_depth */ -bool -check_max_stack_depth(int *newval, void **extra, GucSource source) -{ - long newval_bytes = *newval * 1024L; - long stack_rlimit = get_stack_depth_rlimit(); - - if (stack_rlimit > 0 && newval_bytes > stack_rlimit - STACK_DEPTH_SLOP) - { - GUC_check_errdetail("\"max_stack_depth\" must not exceed %ldkB.", - (stack_rlimit - STACK_DEPTH_SLOP) / 1024L); - GUC_check_errhint("Increase the platform's stack depth limit via \"ulimit -s\" or local equivalent."); - return false; - } - return true; -} - -/* GUC assign hook for max_stack_depth */ -void -assign_max_stack_depth(int newval, void *extra) -{ - long newval_bytes = newval * 1024L; - - max_stack_depth_bytes = newval_bytes; -} - -/* * GUC check_hook for client_connection_check_interval */ bool @@ -5099,40 +4960,6 @@ forbidden_in_wal_sender(char firstchar) } -/* - * Obtain platform stack depth limit (in bytes) - * - * Return -1 if unknown - */ -long -get_stack_depth_rlimit(void) -{ -#if defined(HAVE_GETRLIMIT) - static long val = 0; - - /* This won't change after process launch, so check just once */ - if (val == 0) - { - struct rlimit rlim; - - if (getrlimit(RLIMIT_STACK, &rlim) < 0) - val = -1; - else if (rlim.rlim_cur == RLIM_INFINITY) - val = LONG_MAX; - /* rlim_cur is probably of an unsigned type, so check for overflow */ - else if (rlim.rlim_cur >= LONG_MAX) - val = LONG_MAX; - else - val = rlim.rlim_cur; - } - return val; -#else - /* On Windows we set the backend stack size in src/backend/Makefile */ - return WIN32_STACK_RLIMIT; -#endif -} - - static struct rusage Save_r; static struct timeval Save_t; |