Add tescase for DW_AT_const_value location descriptions.

* testsuite/systemtap.base/const_value.c: New test.
* testsuite/systemtap.base/const_value.exp: Likewise.
* testsuite/systemtap.base/const_value.stp: Likewise.

3 files changed, 71 insertions, 0 deletions

diff --git a/testsuite/systemtap.base/const_value.c b/testsuite/systemtap.base/const_value.c
new file mode 100644
index 00000000..4ff82161
--- /dev/null
+++ b/testsuite/systemtap.base/const_value.c
@@ -0,0 +1,31 @@
+#include "sdt.h"
+
+struct foo
+{
+  const int i;
+  const long j;
+};
+
+typedef struct foo fooer;
+
+static int
+bar (const int i, const long j)
+{
+  return i * j;
+}
+
+// Because of PR10726 we don't want to get this function inlined.
+// We do need -O2 to get the const_value encodings in dwarf.
+static __attribute__((__noinline__)) int
+func (int (*f) ())
+{
+  const fooer baz = { .i = 2, .j = 21 };
+  STAP_PROBE (test, constvalues);
+  return f(baz.i, baz.j);
+}
+
+int
+main (int argc, char *argv[], char *envp[])
+{
+  return func (&bar) - 42;
+}
diff --git a/testsuite/systemtap.base/const_value.exp b/testsuite/systemtap.base/const_value.exp
new file mode 100644
index 00000000..5d5ceaee
--- /dev/null
+++ b/testsuite/systemtap.base/const_value.exp
@@ -0,0 +1,34 @@
+set test "const_value"
+set ::result_string {f: bar
+i: 2
+j: 21}
+
+set test_flags "additional_flags=-g"
+# We need -O2 to get const_value encodings in dwarf.
+set test_flags "$test_flags additional_flags=-O2"
+set test_flags "$test_flags additional_flags=-I$srcdir/../includes/sys"
+
+set res [target_compile $srcdir/$subdir/$test.c $test.exe executable "$test_flags"]
+if { $res != "" } {
+  verbose "target_compile failed: $res" 2
+  fail "$test.c compile"
+  untested "$test"
+  return
+} else {
+  pass "$test.c compile"
+}
+
+# Test only when we are running an install test (can execute) and when gcc
+# vta generated DW_AT_const_values for us. We are interested in both blocks
+# and pure constant addresses (technically only the second was added by vta).
+if {[installtest_p] && [uprobes_p]} {
+  set dw_at_c {DW_AT_const_value}
+  if {![catch {exec readelf --debug-dump=info $test.exe | grep "$dw_at_c"}]} {
+    stap_run2 $srcdir/$subdir/$test.stp -c ./$test.exe
+  } {
+    untested "$test (no-gcc-vta)"
+  }
+} else {
+  untested "$test"
+}
+catch {exec rm -f $test.exe}
diff --git a/testsuite/systemtap.base/const_value.stp b/testsuite/systemtap.base/const_value.stp
new file mode 100644
index 00000000..109d3d46
--- /dev/null
+++ b/testsuite/systemtap.base/const_value.stp
@@ -0,0 +1,6 @@
+probe process("const_value.exe").mark("constvalues")
+{
+  printf("f: %s\n", usymname($f));
+  printf("i: %d\n", $baz->i);
+  printf("j: %d\n", $baz->j);
+}
\ No newline at end of file