[gcc r12-5640] analyzer: verify that -Wanalyzer-too-complex can be disabled via pragmas [PR100524]

[gcc r12-5640] analyzer: verify that -Wanalyzer-too-complex can be disabled via pragmas [PR100524]

[David Malcolm]

https://gcc.gnu.org/g:03ea0ca1189a39e095188b0425c66446cc84a0a5

commit r12-5640-g03ea0ca1189a39e095188b0425c66446cc84a0a5
Author: David Malcolm <dmalcolm@redhat.com>
Date:   Tue Nov 30 14:21:31 2021 -0500

    analyzer: verify that -Wanalyzer-too-complex can be disabled via pragmas [PR100524]
    
    gcc/testsuite/ChangeLog:
            PR analyzer/100524
            * gcc.dg/analyzer/pragma-2.c: New test.
    
    Signed-off-by: David Malcolm <dmalcolm@redhat.com>

Diff:
---
 gcc/testsuite/gcc.dg/analyzer/pragma-2.c | 57 ++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)

diff --git a/gcc/testsuite/gcc.dg/analyzer/pragma-2.c b/gcc/testsuite/gcc.dg/analyzer/pragma-2.c
new file mode 100644
index 00000000000..58fcaab11df
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/analyzer/pragma-2.c
@@ -0,0 +1,57 @@
+/* Verify that we can disable -Wanalyzer-too-complex via pragmas.  */
+/* { dg-additional-options "-Wanalyzer-too-complex -Werror=analyzer-too-complex -fno-analyzer-state-merge -g" } */
+
+#include <stdlib.h>
+
+extern int get (void);
+
+/* In theory each of p0...p4 can be in various malloc states,
+   independently, so the total combined number of states
+   at any program point within the loop is NUM_VARS * NUM_STATES.  */
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wanalyzer-too-complex"
+
+void test (void)
+{
+  void *p0 = NULL, *p1 = NULL, *p2 = NULL, *p3 = NULL, *p4 = NULL;
+  void **pp = NULL;
+  while (get ())
+    {
+      switch (get ())
+	{
+	default:
+	case 0:
+	  pp = &p0;
+	  break;
+	case 1:
+	  pp = &p1;
+	  break;
+	case 2:
+	  pp = &p2;
+	  break;
+	case 3:
+	  pp = &p3;
+	  break;
+	case 4:
+	  pp = &p4;
+	  break;
+	}
+
+      switch (get ())
+	{
+	default:
+	case 0:
+	  *pp = malloc (16); /* { dg-warning "leak" } */
+	  break;
+	case 1:
+	  free (*pp);
+	  break;
+	case 2:
+	  /* no-op.  */
+	  break;
+	}
+    }
+}
+
+#pragma GCC diagnostic pop