From 3a20432bc0a0aa6d8651561d508cc730e6dabc97 Mon Sep 17 00:00:00 2001
From: fche <fche>
Date: Fri, 12 Aug 2005 19:43:55 +0000
Subject: 2005-08-12  Frank Ch. Eigler  <fche@elastic.org>

	PR systemtap/1122 et alii
	* parse.cxx (parse_literal): Parse and range-limit 64-bit numbers.
	(parse_unary): Correct precedence glitch.
	* staptree.h (literal_number): Store an int64_t.
	* staptree.cxx: Corresponding changes.
	* translate.cxx (check_dbz): Remove - insufficient.
	(emit_function): Define CONTEXT macro sibling for THIS.
	(c_typename): pe_long -> int64_t.
	(visit_literal_number): Format literal rigorously and uglily.
	(c_assignop, visit_binary_expression): Handle div/mod via new
	helper functions in runtime.
	* tapset/builtin_logging.stp: Add error, exit builtins.
	* testsuite/buildok/ten,eleven.stp: New tests.
	* testsuite/parse{ko,ok}/six.stp: Modify for larger numbers.
	* testsuite/transok/one.stp: Add more ";"s, maybe unnecessarily.

2005-08-12  Frank Ch. Eigler  <fche@elastic.org>

	* arith.c: New file to contain arithmetic helper functions.
	* builtin_functions.h: Remove, unused.
	* runtime.h: Include it.
---
 runtime/arith.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 runtime/arith.c

(limited to 'runtime/arith.c')

diff --git a/runtime/arith.c b/runtime/arith.c
new file mode 100644
index 00000000..175cc4e8
--- /dev/null
+++ b/runtime/arith.c
@@ -0,0 +1,79 @@
+#ifndef _ARITH_C_ /* -*- linux-c -*- */
+#define _ARITH_C_
+
+/** @file arith.
+ * @brief Implements 64-bit signed division/multiplication.
+ */
+
+struct context;
+void _stp_divmod64 (unsigned *errorcount, int64_t x, int64_t y,
+                    int64_t *quo, int64_t *rem);
+
+
+/** Divide x by y.  In case of overflow or division-by-zero,
+ * increment context errorcount, and return any old value.
+ */
+inline int64_t _stp_div64 (unsigned *errorcount, int64_t x, int64_t y)
+{
+  if (likely ((x >= LONG_MIN && x <= LONG_MAX) &&
+              (y >= LONG_MIN && y <= LONG_MAX)))
+    {
+      long xx = (long) x;
+      long yy = (long) y;
+      // check for division-by-zero and overflow
+      if (unlikely (yy == 0 || (xx == LONG_MIN && yy == -1)))
+        {
+          (*errorcount) ++;
+          return 0;
+        }
+      return xx / yy;
+    }
+  else
+    {
+      int64_t quo = 0;
+      _stp_divmod64 (errorcount, x, y, &quo, NULL);
+      return quo;
+    }
+}
+
+
+/** Modulo x by y.  In case of overflow or division-by-zero,
+ * increment context errorcount, and return any old value.
+ */
+inline int64_t _stp_mod64 (unsigned *errorcount, int64_t x, int64_t y)
+{
+  if (likely ((x >= LONG_MIN && x <= LONG_MAX) &&
+              (y >= LONG_MIN && y <= LONG_MAX)))
+    {
+      long xx = (long) x;
+      long yy = (long) y;
+      // check for division-by-zero and overflow
+      if (unlikely (yy == 0 || (xx == LONG_MIN && yy == -1)))
+        {
+          (*errorcount) ++;
+          return 0;
+        }
+      return xx % yy;
+    }
+  else
+    {
+      int64_t rem = 0;
+      _stp_divmod64 (errorcount, x, y, NULL, &rem);
+      return rem;
+    }
+}
+
+
+/** Perform general long division/modulus. */
+void _stp_divmod64 (unsigned *errorcount, int64_t x, int64_t y,
+                    int64_t *quo, int64_t *rem)
+{
+  // XXX: wimp out for now
+  (*errorcount) ++;
+  if (quo) *quo = 0;
+  if (rem) *rem = 0;
+}
+
+
+
+#endif /* _ARITH_C_ */
-- 
cgit