[PATCH] Consider functions with xloc.file == NULL (PR, gcov-profile/69028)

[Martin Liška]

Hi.

Following patch addresses ICE which happens when coverage.c computes checksum
of a function w/o xloc.file. My patch assumes it's a valid state having a 
function
w/o xloc.file, which is situation exposed by cilkplus functions.

Patch can bootstrap on ppc64le-redhat-linux and survives regression tests.

Ready to be installed?
Martin

>From ac1ba622f394d9914c5f8250719780595f54b571 Mon Sep 17 00:00:00 2001
From: marxin <mli...@suse.cz>
Date: Wed, 20 Jul 2016 09:54:12 +0200
Subject: [PATCH] Consider functions with xloc.file == NULL (PR
 gcov-profile/69028)

gcc/testsuite/ChangeLog:

2016-07-20  Martin Liska  <mli...@suse.cz>

	PR gcov-profile/69028
	PR gcov-profile/62047
	* g++.dg/cilk-plus/pr69028.C: New test.

gcc/ChangeLog:

2016-07-20  Martin Liska  <mli...@suse.cz>

	* coverage.c (coverage_compute_lineno_checksum): Do not
	calculate checksum for fns w/o xloc.file.
	(coverage_compute_profile_id): Likewise.
---
 gcc/coverage.c                           |  6 ++++--
 gcc/testsuite/g++.dg/cilk-plus/pr69028.C | 13 +++++++++++++
 2 files changed, 17 insertions(+), 2 deletions(-)
 create mode 100644 gcc/testsuite/g++.dg/cilk-plus/pr69028.C

diff --git a/gcc/coverage.c b/gcc/coverage.c
index 67cc908..d4d371e 100644
--- a/gcc/coverage.c
+++ b/gcc/coverage.c
@@ -553,7 +553,8 @@ coverage_compute_lineno_checksum (void)
     = expand_location (DECL_SOURCE_LOCATION (current_function_decl));
   unsigned chksum = xloc.line;
 
-  chksum = coverage_checksum_string (chksum, xloc.file);
+  if (xloc.file)
+    chksum = coverage_checksum_string (chksum, xloc.file);
   chksum = coverage_checksum_string
     (chksum, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl)));
 
@@ -580,7 +581,8 @@ coverage_compute_profile_id (struct cgraph_node *n)
       bool use_name_only = (PARAM_VALUE (PARAM_PROFILE_FUNC_INTERNAL_ID) == 0);
 
       chksum = (use_name_only ? 0 : xloc.line);
-      chksum = coverage_checksum_string (chksum, xloc.file);
+      if (xloc.file)
+	chksum = coverage_checksum_string (chksum, xloc.file);
       chksum = coverage_checksum_string
 	(chksum, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (n->decl)));
       if (!use_name_only && first_global_object_name)
diff --git a/gcc/testsuite/g++.dg/cilk-plus/pr69028.C b/gcc/testsuite/g++.dg/cilk-plus/pr69028.C
new file mode 100644
index 0000000..31542f3
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cilk-plus/pr69028.C
@@ -0,0 +1,13 @@
+// PR c++/69028
+// { dg-require-effective-target c++11 }
+// { dg-options "-fcilkplus -fprofile-arcs" }
+
+void parallel()
+{
+}
+
+int main()
+{
+   _Cilk_spawn parallel();
+   _Cilk_sync;
+}
-- 
2.9.0