Fix mem region parsing regression and add test

In my patch

  Get rid of VEC (mem_region)
  a664f67e50eff30198097d51cec0ec4690abb2a1

I introduced a regression, where the length of the memory region is
assigned to the "hi" field.  It should obviously be computed as "start +
length".  To my defense, no test had caught this :).  As a penance, I
wrote one.

gdb/ChangeLog:

	* Makefile.in (SUBDIR_UNITTESTS_SRCS): Add
	memory-map-selftests.c.
	(SUBDIR_UNITTESTS_OBS): Add memory-map-selftests.o.
	* memory-map.c (memory_map_start_memory): Fix computation of hi
	address.
	* unittests/memory-map-selftests.c: New file.

1 files changed, 81 insertions, 0 deletions

diff --git a/gdb/unittests/memory-map-selftests.c b/gdb/unittests/memory-map-selftests.c
new file mode 100644
index 0000000..3b282b5
--- /dev/null
+++ b/gdb/unittests/memory-map-selftests.c
@@ -0,0 +1,81 @@
+/* Self tests for memory-map for GDB, the GNU debugger.
+
+   Copyright (C) 2017 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   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/>.  */
+
+#include "defs.h"
+#include "selftest.h"
+#include "memory-map.h"
+
+namespace selftests {
+namespace memory_map_tests {
+
+/* A simple valid test input for parse_memory_map.  */
+
+static const char *valid_mem_map = R"(<?xml version="1.0"?>
+<!DOCTYPE memory-map
+          PUBLIC "+//IDN gnu.org//DTD GDB Memory Map V1.0//EN"
+                 "http://sourceware.org/gdb/gdb-memory-map.dtd">
+<memory-map>
+  <memory type="ram" start="0" length="4096" />
+  <memory type="rom" start="65536" length="256" />
+  <memory type="flash" start="131072" length="65536">
+    <property name="blocksize">1024</property>
+  </memory>
+</memory-map>
+)";
+
+/* Validate memory region R against some expected values (the other
+   parameters).  */
+
+static void
+check_mem_region (const mem_region &r, CORE_ADDR lo, CORE_ADDR hi,
+		  mem_access_mode mode, int blocksize)
+{
+  SELF_CHECK (r.lo == lo);
+  SELF_CHECK (r.hi == hi);
+  SELF_CHECK (r.enabled_p);
+
+  SELF_CHECK (r.attrib.mode == mode);
+  SELF_CHECK (r.attrib.blocksize == blocksize);
+
+}
+
+/* Test the parse_memory_map function.  */
+
+static void
+parse_memory_map_tests ()
+{
+  std::vector<mem_region> regions = parse_memory_map (valid_mem_map);
+
+  SELF_CHECK (regions.size () == 3);
+
+  check_mem_region (regions[0], 0, 0 + 4096, MEM_RW, -1);
+  check_mem_region (regions[1], 65536, 65536 + 256, MEM_RO, -1);
+  check_mem_region (regions[2], 131072, 131072 + 65536, MEM_FLASH, 1024);
+}
+
+} /* namespace memory_map_tests */
+} /* namespace selftests */
+
+void
+_initialize_memory_map_selftests ()
+{
+  selftests::register_test
+    ("parse_memory_map",
+     selftests::memory_map_tests::parse_memory_map_tests);
+}