[PATCH] Support running the selftests under valgrind

[David Malcolm <dmalcolm at redhat dot com>]

This patch adds a new phony target to gcc/Makefile.in to make it easy
to run the selftests under valgrind, via "make selftest-valgrind".
This phony target isn't a dependency of anything; it's purely for
convenience (it takes about 4-5 seconds on my box).

Doing so uncovered a few leaks in the selftest suite, which the
patch also fixes, so that it runs cleanly under valgrind (on
x86_64-pc-linux-gnu, configured with --enable-valgrind-annotations,
at least).

Successfully bootstrapped&regrtested on x86_64-pc-linux-gnu.
Manually verified that the valgrind output is "clean" on
x86_64-pc-linux-gnu [1].

OK for trunk?

[1]:

 HEAP SUMMARY:
     in use at exit: 1,203,983 bytes in 2,114 blocks
   total heap usage: 4,545 allocs, 2,431 frees, 3,212,841 bytes allocated

 LEAK SUMMARY:
    definitely lost: 0 bytes in 0 blocks
    indirectly lost: 0 bytes in 0 blocks
      possibly lost: 0 bytes in 0 blocks
    still reachable: 1,203,983 bytes in 2,114 blocks
         suppressed: 0 bytes in 0 blocks
 Reachable blocks (those to which a pointer was found) are not shown.
 To see them, rerun with: --leak-check=full --show-leak-kinds=all

 For counts of detected and suppressed errors, rerun with: -v
 ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 2 from 2)

gcc/ChangeLog:
	* Makefile.in (selftest-valgrind): New phony target.
	* function-tests.c (selftest::build_cfg): Delete pass instances
	created by the test.
	(selftest::convert_to_ssa): Likewise.
	(selftest::test_expansion_to_rtl): Likewise.
	* tree-cfg.c (selftest::test_linear_chain): Release dominator
	vectors.
	(selftest::test_diamond): Likewise.
---
 gcc/Makefile.in      | 6 ++++++
 gcc/function-tests.c | 4 ++++
 gcc/tree-cfg.c       | 6 ++++++
 3 files changed, 16 insertions(+)

diff --git a/gcc/Makefile.in b/gcc/Makefile.in
index 5e7422d..1a4b5d7 100644
--- a/gcc/Makefile.in
+++ b/gcc/Makefile.in
@@ -1869,6 +1869,12 @@ s-selftest: $(GCC_PASSES) cc1$(exeext) stmp-int-hdrs
 selftest-gdb: $(GCC_PASSES) cc1$(exeext) stmp-int-hdrs
 	$(GCC_FOR_TARGET) -xc -S -c /dev/null -fself-test -wrapper gdb,--args
 
+# Convenience method for running selftests under valgrind:
+.PHONY: selftest-valgrind
+selftest-valgrind: $(GCC_PASSES) cc1$(exeext) stmp-int-hdrs
+	$(GCC_FOR_TARGET) -xc -S -c /dev/null -fself-test \
+	  -wrapper valgrind,--leak-check=full
+
 # Recompile all the language-independent object files.
 # This is used only if the user explicitly asks for it.
 compilations: $(BACKEND)
diff --git a/gcc/function-tests.c b/gcc/function-tests.c
index c8188e7..edd355f 100644
--- a/gcc/function-tests.c
+++ b/gcc/function-tests.c
@@ -296,6 +296,7 @@ build_cfg (tree fndecl)
   push_cfun (fun);
   lower_cf_pass->execute (fun);
   pop_cfun ();
+  delete lower_cf_pass;
 
   /* We can now convert to CFG form; for our trivial test function this
      gives us:
@@ -310,6 +311,7 @@ build_cfg (tree fndecl)
   push_cfun (fun);
   build_cfg_pass->execute (fun);
   pop_cfun ();
+  delete build_cfg_pass;
 }
 
 /* Convert a gimple+CFG function to SSA form.  */
@@ -325,6 +327,7 @@ convert_to_ssa (tree fndecl)
   push_cfun (fun);
   build_ssa_pass->execute (fun);
   pop_cfun ();
+  delete build_ssa_pass;
 }
 
 /* Assuming we have a simple 3-block CFG like this:
@@ -594,6 +597,7 @@ test_expansion_to_rtl ()
   init_function_start (fndecl);
   expand_pass->execute (fun);
   pop_cfun ();
+  delete expand_pass;
 
   /* On x86_64, I get this:
        (note 3 1 2 2 [bb 2] NOTE_INSN_BASIC_BLOCK)
diff --git a/gcc/tree-cfg.c b/gcc/tree-cfg.c
index 0fac49c..6d69435 100644
--- a/gcc/tree-cfg.c
+++ b/gcc/tree-cfg.c
@@ -9276,6 +9276,7 @@ test_linear_chain ()
   ASSERT_EQ (1, dom_by_b.length ());
   ASSERT_EQ (bb_c, dom_by_b[0]);
   free_dominance_info (CDI_DOMINATORS);
+  dom_by_b.release ();
 
   /* Similarly for post-dominance: each BB in our chain is post-dominated
      by the one after it.  */
@@ -9286,6 +9287,7 @@ test_linear_chain ()
   ASSERT_EQ (1, postdom_by_b.length ());
   ASSERT_EQ (bb_a, postdom_by_b[0]);
   free_dominance_info (CDI_POST_DOMINATORS);
+  postdom_by_b.release ();
 
   pop_cfun ();
 }
@@ -9346,8 +9348,10 @@ test_diamond ()
   ASSERT_EQ (bb_a, get_immediate_dominator (CDI_DOMINATORS, bb_d));
   vec<basic_block> dom_by_a = get_dominated_by (CDI_DOMINATORS, bb_a);
   ASSERT_EQ (3, dom_by_a.length ()); /* B, C, D, in some order.  */
+  dom_by_a.release ();
   vec<basic_block> dom_by_b = get_dominated_by (CDI_DOMINATORS, bb_b);
   ASSERT_EQ (0, dom_by_b.length ());
+  dom_by_b.release ();
   free_dominance_info (CDI_DOMINATORS);
 
   /* Similarly for post-dominance.  */
@@ -9357,8 +9361,10 @@ test_diamond ()
   ASSERT_EQ (bb_d, get_immediate_dominator (CDI_POST_DOMINATORS, bb_c));
   vec<basic_block> postdom_by_d = get_dominated_by (CDI_POST_DOMINATORS, bb_d);
   ASSERT_EQ (3, postdom_by_d.length ()); /* A, B, C in some order.  */
+  postdom_by_d.release ();
   vec<basic_block> postdom_by_b = get_dominated_by (CDI_POST_DOMINATORS, bb_b);
   ASSERT_EQ (0, postdom_by_b.length ());
+  postdom_by_b.release ();
   free_dominance_info (CDI_POST_DOMINATORS);
 
   pop_cfun ();
-- 
1.8.5.3