1 files changed, 58 insertions, 0 deletions
diff --git a/usr.sbin/pmcstudy/eval_expr.h b/usr.sbin/pmcstudy/eval_expr.h
new file mode 100644
index 0000000..f095513
--- /dev/null
+++ b/usr.sbin/pmcstudy/eval_expr.h
@@ -0,0 +1,58 @@
+#ifndef __eval_expr_h__
+#define __eval_expr_h__
+/*-
+ * Copyright (c) 2015 Netflix Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer,
+ *    in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+__FBSDID("$FreeBSD$");
+
+enum exptype {
+	TYPE_OP_PLUS,
+	TYPE_OP_MINUS,
+	TYPE_OP_MULT,
+	TYPE_OP_DIVIDE,
+	TYPE_PARN_OPEN,
+	TYPE_PARN_CLOSE,
+	TYPE_VALUE_CON,
+	TYPE_VALUE_PMC
+};
+
+#define STATE_UNSET  0		/* We have no setting yet in value */
+#define STATE_FILLED 1		/* We have filled in value */
+
+struct expression {
+	struct expression *next;	/* Next in expression. */
+	struct expression *prev;	/* Prev in expression. */
+	double value;			/* If there is a value to set */
+	enum exptype type;			/* What is it */
+	uint8_t state;			/* Current state if value type */
+	char name[252];			/* If a PMC whats the name, con value*/
+};
+
+struct expression *parse_expression(char *str);
+double run_expr(struct expression *exp, int initial_call, struct expression **lastone);
+void print_exp(struct expression *exp);
+#endif