Merge #1410

1410: unsafe: Add UnsafeCheck visitor r=CohenArthur a=CohenArthur

This visitor takes care of checking for unsafe expressions in safe
contexts. This first iteration reports the dereferencing of raw
pointers.


Co-authored-by: Arthur Cohen <arthur.cohen@embecosm.com>

2 files changed, 33 insertions, 0 deletions

diff --git a/gcc/testsuite/rust/compile/unsafe4.rs b/gcc/testsuite/rust/compile/unsafe4.rs
new file mode 100644
index 0000000..7d1356b
--- /dev/null
+++ b/gcc/testsuite/rust/compile/unsafe4.rs
@@ -0,0 +1,29 @@
+fn foo() -> i32 {
+    let a = 15;
+    let p_a = &a as *const i32;
+
+    unsafe { *p_a }
+}
+
+unsafe fn bar() -> i32 {
+    let a = 15;
+    let p_a = &a as *const i32;
+
+    *p_a
+}
+
+fn baz() -> i32 {
+    let a = 15;
+    let p_a = &a as *const i32;
+
+    *p_a // { dg-error "dereference of raw pointer" }
+}
+
+unsafe fn qux() -> i32 {
+    let a = 15;
+    let p_a = &a as *const i32;
+
+    unsafe {}
+
+    *p_a
+}
diff --git a/gcc/testsuite/rust/compile/unsafe5.rs b/gcc/testsuite/rust/compile/unsafe5.rs
new file mode 100644
index 0000000..35990f6
--- /dev/null
+++ b/gcc/testsuite/rust/compile/unsafe5.rs
@@ -0,0 +1,4 @@
+fn main() {
+    let b = 15;
+    let c = *(&b as *const i32); // { dg-error "dereference of raw pointer" }
+}