introduce option to time assert()s

. remove a few asserts in the kernel and 64bi library
    that are not compatible with the timing code
  . change the TIME_BLOCKS code a little to work in-kernel

common/include/timers.h

@@ -64,12 +64,11 @@ _PROTOTYPE( clock_t tmrs_settimer, (timer_t **tmrs, timer_t *tp,
 	clock_t exp_time, tmr_func_t watchdog, clock_t *new_head)				);
 
 #define PRINT_STATS(cum_spenttime, cum_instances) {		\
-		if(ex64hi(cum_spenttime)) { printf(" ???\n"); }	\
-		printf("%s:%d,%lu,%lu,%lu,%d.%04d%%\n", \
+		if(ex64hi(cum_spenttime)) { util_stacktrace(); printf(" ( ??? %lu %lu)\n",	\
+			ex64hi(cum_spenttime), ex64lo(cum_spenttime)); } \
+		printf("%s:%d,%lu,%lu\n", \
 			__FILE__, __LINE__, cum_instances,	\
-			div64u(cum_spenttime, cum_instances),	\
-			 ex64lo(cum_spenttime),	\
-			perc/10000, perc%10000);	\
+			 ex64lo(cum_spenttime)); \
 	}
 
 #define RESET_STATS(starttime, cum_instances, cum_spenttime, cum_starttime) { \
@@ -83,7 +82,6 @@ _PROTOTYPE( clock_t tmrs_settimer, (timer_t **tmrs, timer_t *tp,
 	static int _cum_instances;				\
 	u64_t _next_cum_spent, _starttime, _endtime, _dt, _cum_dt;	\
 	u32_t _dt_micros;					\
-	int perc;						\
 	read_tsc_64(&_starttime);				\
 	do { timed_code_block } while(0);			\
 	read_tsc_64(&_endtime);					\
@@ -99,7 +97,6 @@ _PROTOTYPE( clock_t tmrs_settimer, (timer_t **tmrs, timer_t *tp,
 	_cum_spenttime = add64(_cum_spenttime, _dt);		\
 	_cum_instances++;					\
 	_cum_dt = sub64(_endtime, _cum_starttime);		\
-	perc=ex64lo(div64(mul64(_cum_spenttime,make64(1000000,0)), _cum_dt));	\
 	if(cmp64(_cum_dt, make64(0, 120)) > 0) {		\
 		PRINT_STATS(_cum_spenttime, _cum_instances);	\
 		RESET_STATS(_starttime, _cum_instances, _cum_spenttime, _cum_starttime); 	\

include/assert.h

@@ -19,6 +19,12 @@
 #include <minix/ansi.h>
 #endif
 
+#if TIME_ASSERTS
+#define _ASSERT_EVALUATE(st) do { TIME_BLOCK(st); } while(0)
+#else
+#define _ASSERT_EVALUATE(st) do { st } while(0)
+#endif
+
 #ifdef NDEBUG
 /* Debugging disabled -- do not evaluate assertions. */
 #define assert(expr)  ((void) 0)
@@ -29,10 +35,11 @@
 #define	__xstr(x)	__makestr(x)
 
 _PROTOTYPE( void __bad_assertion, (const char *_mess) );
-#define	assert(expr)	((expr)? (void)0 : \
-				__bad_assertion("Assertion \"" #expr \
-				    "\" failed, file " __xstr(__FILE__) \
-				    ", line " __xstr(__LINE__) "\n"))
+#define	assert(expr)	do { int _av;	\
+			_ASSERT_EVALUATE(_av = !!(expr););	\
+			if(!_av) {	\
+				__bad_assertion("Assertion \"" #expr "\" failed, file " __xstr(__FILE__) ", line " __xstr(__LINE__) "\n"); \
+		    } } while(0)
 #else
 #define assert(expr) ((void) ((expr) ? 0 : __assert( __FILE__,  __LINE__)))
 #endif /* _ANSI */

kernel/arch/i386/exception.c

@@ -24,8 +24,6 @@ PRIVATE void pagefault( struct proc *pr,
 	message m_pagefault;
 	int err;
 
-	assert(frame);
-
 	pagefaultcr2 = read_cr2();
 
 #if 0
@@ -33,10 +31,6 @@ PRIVATE void pagefault( struct proc *pr,
 		pr->p_endpoint, pagefaultcr2, pr->p_seg.p_cr3, read_cr3());
 #endif
 
-	if(pr->p_seg.p_cr3) {
-		assert(pr->p_seg.p_cr3 == read_cr3());
-	}
-
 	in_physcopy = (frame->eip > (vir_bytes) phys_copy) &&
 	   (frame->eip < (vir_bytes) phys_copy_fault);
 
@@ -81,8 +75,6 @@ PRIVATE void pagefault( struct proc *pr,
 	}
 
 	/* Don't schedule this process until pagefault is handled. */
-	assert(pr->p_seg.p_cr3 == read_cr3());
-	assert(!RTS_ISSET(pr, RTS_PAGEFAULT));
 	RTS_SET(pr, RTS_PAGEFAULT);
 
 	/* tell Vm about the pagefault */

lib/libc/arch/i386/int64/div64.c

@@ -26,11 +26,6 @@ static u64_t divrem64(u64_t *i, u64_t j)
 	u64_t result = { 0, 0 };
 	unsigned shift;
 
-	assert(i);
-
-	/* this function is not suitable for small divisors */
-	assert(ex64hi(j) != 0);
-
 	/* as long as i >= j we work on reducing i */
 	while (cmp64(*i, j) >= 0) {
 		/* shift to obtain the 32 most significant bits */