Fix regression in -Wuninitialized involving VLAs. It turns out that we were modeling sizeof(VLAs)

incorrectly in the CFG, and also the static analyzer.  This patch regresses the analyzer a bit, but
that needs to be followed up with a better solution.

Fixes <rdar://problem/10008112>.

llvm-svn: 138372

1 files changed, 32 insertions, 0 deletions

diff --git a/clang/test/Analysis/outofbound-notwork.c b/clang/test/Analysis/outofbound-notwork.c
new file mode 100644
index 00000000000..45e713b6880
--- /dev/null
+++ b/clang/test/Analysis/outofbound-notwork.c
@@ -0,0 +1,32 @@
+// RUN: %clang_cc1 -Wno-array-bounds -analyze -analyzer-checker=core,experimental.unix,experimental.security.ArrayBound -analyzer-store=region -verify %s
+// XFAIL: *
+
+// Once we better handle modeling of sizes of VLAs, we can pull this back
+// into outofbound.c.
+
+void sizeof_vla(int a) {
+  if (a == 5) {
+    char x[a];
+    int y[sizeof(x)];
+    y[4] = 4; // no-warning
+    y[5] = 5; // expected-warning{{out-of-bound}}
+  }
+}
+
+void sizeof_vla_2(int a) {
+  if (a == 5) {
+    char x[a];
+    int y[sizeof(x) / sizeof(char)];
+    y[4] = 4; // no-warning
+    y[5] = 5; // expected-warning{{out-of-bound}}
+  }
+}
+
+void sizeof_vla_3(int a) {
+  if (a == 5) {
+    char x[a];
+    int y[sizeof(*&*&*&x)];
+    y[4] = 4; // no-warning
+    y[5] = 5; // expected-warning{{out-of-bound}}
+  }
+}