range stepping: tests

This adds tests to verify range stepping is used as expected, by
inspecting the RSP traffic, looking for vCont;s and vCont;r packets.

gdb/testsuite/
2013-05-23  Yao Qi  <yao@codesourcery.com>
	    Pedro Alves  <palves@redhat.com>

	* gdb.base/range-stepping.c: New file.
	* gdb.base/range-stepping.exp: New file.
	* gdb.trace/range-stepping.c: New file.
	* gdb.trace/range-stepping.exp: New file.
	* lib/range-stepping-support.exp: New file.

1 files changed, 104 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.base/range-stepping.c b/gdb/testsuite/gdb.base/range-stepping.c
new file mode 100644
index 0000000..0d6c41a
--- /dev/null
+++ b/gdb/testsuite/gdb.base/range-stepping.c
@@ -0,0 +1,104 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2013 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* Note: 'volatile' is used to make sure the compiler doesn't fold /
+   optimize out the arithmetic that uses the variables.  */
+
+static int
+func1 (int a, int b)
+{
+  volatile int r = a * b;
+
+  r += (a | b);
+  r += (a - b);
+
+  return r;
+}
+
+int
+main(void)
+{
+  volatile int a = 0;
+  volatile int b = 1;
+  volatile int c = 2;
+  volatile int d = 3;
+  volatile int e = 4;
+  volatile double d1 = 1.0;
+  volatile double d2 = 2.0;
+
+  /* A macro that expands to a single source line that compiles to a
+     number of instructions, with no branches.  */
+#define LINE_WITH_MULTIPLE_INSTRUCTIONS		\
+  do							\
+    {							\
+      a = b + c + d * e - a;				\
+    } while (0)
+
+  LINE_WITH_MULTIPLE_INSTRUCTIONS; /* location 1 */
+
+  /* A line of source code that compiles to a function call (jump or
+     branch), surrounded by instructions before and after.  IOW, this
+     will generate approximately the following pseudo-instructions:
+
+addr1:
+     insn1;
+     insn2;
+     ...
+     call func1;
+     ...
+     insn3;
+addr2:
+     insn4;
+*/
+  e = 10 + func1 (a + b, c * d); /* location 2 */
+
+  e = 10 + func1 (a + b, c * d);
+
+  /* Generate a single source line that includes a short loop.  */
+#define LINE_WITH_LOOP						\
+  do								\
+    {								\
+      for (a = 0, e = 0; a < 15; a++)				\
+	e += a;							\
+    } while (0)
+
+  LINE_WITH_LOOP;
+
+  LINE_WITH_LOOP;
+
+  /* Generate a single source line that includes a time-consuming
+     loop.  GDB breaks the loop early by clearing variable 'c'.  */
+#define LINE_WITH_TIME_CONSUMING_LOOP					\
+  do									\
+    {									\
+      for (c = 1, a = 0; a < 65535 && c; a++)				\
+	for (b = 0; b < 65535 && c; b++)				\
+	  {								\
+	    d1 = d2 * a / b;						\
+	    d2 = d1 * a;						\
+	  }								\
+    } while (0)
+
+  LINE_WITH_TIME_CONSUMING_LOOP;
+
+  /* Some multi-instruction lines for software watchpoint tests.  */
+  LINE_WITH_MULTIPLE_INSTRUCTIONS;
+  LINE_WITH_MULTIPLE_INSTRUCTIONS; /* soft-watch */
+  LINE_WITH_MULTIPLE_INSTRUCTIONS;
+
+  return 0;
+}