The testcase was generating DW_AT_high_pc and DW_AT_low_pc entries

with type DW_FORM_string, which is wrong.

GDB was using that information to load data as strings, and then
proceeded to use the string pointers as addresses.

Even then, the test was passing just fine, because we were lucky
enough to have the low_pc string pointer smaller than the high_pc
string pointer.

Two issues are fixed.  The first one is the DW_FORM_string type. The
second one is adjusting the addresses so that they are non-zero,
since GDB doesn't like seeing 0 in these fields due to a check
contained in dwarf2_get_pc_bounds:

  if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
    return 0;

With both fixes, the testcase passes deterministically.

2014-06-19  Luis Machado  <lgustavo@codesourcery.com>

	* gdb.cp/nsalias.exp: Set type of low_pc and high_pc entries
	to DW_FORM_addr and use non-zero addresses.

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 9a6aa77..2fdcbb4 100644 (file)
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2014-06-18  Luis Machado  <lgustavo@codesourcery.com>
+
+       * gdb.cp/nsalias.exp: Set type of low_pc and high_pc entries
+       to DW_FORM_addr and use non-zero addresses.
+
 2014-06-18  Siva Chandra Reddy  <sivachandra@google.com>
 
        PR gdb/17017

diff --git a/gdb/testsuite/gdb.cp/nsalias.exp b/gdb/testsuite/gdb.cp/nsalias.exp
index f99b609..d46c302 100644 (file)
--- a/gdb/testsuite/gdb.cp/nsalias.exp
+++ b/gdb/testsuite/gdb.cp/nsalias.exp
@@ -153,20 +153,20 @@ Dwarf::assemble $asm_file {
 
            subprogram {
                {specification :$im_foo_label}
-               {low_pc 0x0}
-               {high_pc 0x1}
+               {low_pc 0x1 DW_FORM_addr}
+               {high_pc 0x2 DW_FORM_addr}
            }
 
            subprogram {
                {specification :$i_foo_label}
-               {low_pc 0x2}
-               {high_pc 0x3}
+               {low_pc 0x3 DW_FORM_addr}
+               {high_pc 0x4 DW_FORM_addr}
            }
 
            subprogram {
                {specification :$o_foo_label}
-               {low_pc 0x4}
-               {high_pc 0x5}
+               {low_pc 0x5 DW_FORM_addr}
+               {high_pc 0x6 DW_FORM_addr}
            }
        }
     }