[gcc r12-3487] c++: fix -fsanitize-coverage=trace-pc ICE [PR101331]

[Martin Liska]

https://gcc.gnu.org/g:90ac6edc3c0123b6cf975781f70c8517db84bd63

commit r12-3487-g90ac6edc3c0123b6cf975781f70c8517db84bd63
Author: Martin Liska <mliska@suse.cz>
Date:   Thu Aug 12 17:49:14 2021 +0200

    c++: fix -fsanitize-coverage=trace-pc ICE [PR101331]
    
            PR c++/101331
    
    gcc/ChangeLog:
    
            * asan.h (sanitize_coverage_p): Handle when fn == NULL.
    
    gcc/testsuite/ChangeLog:
    
            * g++.dg/pr101331.C: New test.

Diff:
---
 gcc/asan.h                      | 5 +++--
 gcc/testsuite/g++.dg/pr101331.C | 7 +++++++
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/gcc/asan.h b/gcc/asan.h
index 8c0b2baf170..820c18bbd0a 100644
--- a/gcc/asan.h
+++ b/gcc/asan.h
@@ -255,8 +255,9 @@ static inline bool
 sanitize_coverage_p (const_tree fn = current_function_decl)
 {
   return (flag_sanitize_coverage
-	  && lookup_attribute ("no_sanitize_coverage",
-			       DECL_ATTRIBUTES (fn)) == NULL_TREE);
+	  && (fn == NULL_TREE
+	      || lookup_attribute ("no_sanitize_coverage",
+				   DECL_ATTRIBUTES (fn)) == NULL_TREE));
 }
 
 #endif /* TREE_ASAN */
diff --git a/gcc/testsuite/g++.dg/pr101331.C b/gcc/testsuite/g++.dg/pr101331.C
new file mode 100644
index 00000000000..015aba200d3
--- /dev/null
+++ b/gcc/testsuite/g++.dg/pr101331.C
@@ -0,0 +1,7 @@
+// PR c++/101331
+// { dg-do compile }
+// { dg-options "-fsanitize-coverage=trace-pc -O2 -std=c++11" }
+
+int a[2];
+int b = 1;
+int c { b && (a[b] = 0) };