From 5a4a805a4d460a6996facc5d1fd06986344c899b Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Mon, 27 Jun 2016 19:51:19 -0400
Subject: Implement -D rates.

---
 eval.c | 47 +++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 45 insertions(+), 2 deletions(-)

(limited to 'eval.c')

diff --git a/eval.c b/eval.c
index f7292a2..48603fb 100644
--- a/eval.c
+++ b/eval.c
@@ -742,11 +742,50 @@ bool eval_xtype(const struct expr *expr, struct eval_state *state) {
 	return false;
 }
 
+/**
+ * Record the time that elapsed evaluating an expression.
+ */
+static void add_elapsed(struct expr *expr, const struct timespec *start, const struct timespec *end) {
+	expr->elapsed.tv_sec += end->tv_sec - start->tv_sec;
+	expr->elapsed.tv_nsec += end->tv_nsec - start->tv_nsec;
+	if (expr->elapsed.tv_nsec < 0) {
+		expr->elapsed.tv_nsec += 1000000000L;
+		--expr->elapsed.tv_sec;
+	} else if (expr->elapsed.tv_nsec >= 1000000000L) {
+		expr->elapsed.tv_nsec -= 1000000000L;
+		++expr->elapsed.tv_sec;
+	}
+}
+
 /**
  * Evaluate an expression.
  */
-static bool eval_expr(const struct expr *expr, struct eval_state *state) {
-	return expr->eval(expr, state);
+static bool eval_expr(struct expr *expr, struct eval_state *state) {
+	struct timespec start, end;
+	bool time = state->cmdline->debug & DEBUG_RATES;
+	if (time) {
+		if (clock_gettime(CLOCK_MONOTONIC, &start) != 0) {
+			perror("clock_gettime()");
+			time = false;
+		}
+	}
+
+	bool ret = expr->eval(expr, state);
+
+	if (time) {
+		if (clock_gettime(CLOCK_MONOTONIC, &end) == 0) {
+			add_elapsed(expr, &start, &end);
+		} else {
+			perror("clock_gettime()");
+		}
+	}
+
+	++expr->evaluations;
+	if (ret) {
+		++expr->successes;
+	}
+
+	return ret;
 }
 
 /**
@@ -943,5 +982,9 @@ int eval_cmdline(const struct cmdline *cmdline) {
 		}
 	}
 
+	if (cmdline->debug & DEBUG_RATES) {
+		dump_cmdline(cmdline, true);
+	}
+
 	return args.ret;
 }
-- 
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