From: Dave <dme2223@gmail.com>
Date: Mon, 19 Dec 2022 16:59:00 +0000 (-0600)
Subject: gccrs: Check for mutable references in const functions
X-Git-Tag: upstream/13.1.0~217
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d9e05700ac3085f29e95d53b3ec59c22adbc7c71;p=platform%2Fupstream%2Fgcc.git

gccrs: Check for mutable references in const functions

Use StackedContext instead. Fix error string

Signed-off-by: Dave Evans <dave@dmetwo.org>

(Squashed commits) Check for mutable references in const functions using StackedContext

gcc/rust/ChangeLog:

	* checks/errors/rust-const-checker.cc (ConstChecker::visit): Use StackedContext
	class.

gcc/testsuite/ChangeLog:

	* rust/compile/const10.rs: New test.

Signed-off-by: Dave Evans <dave@dmetwo.org>
---

diff --git a/gcc/rust/checks/errors/rust-const-checker.cc b/gcc/rust/checks/errors/rust-const-checker.cc
index 576c1b1..7e31c9f 100644
--- a/gcc/rust/checks/errors/rust-const-checker.cc
+++ b/gcc/rust/checks/errors/rust-const-checker.cc
@@ -898,8 +898,12 @@ ConstChecker::visit (RawPointerType &)
 {}
 
 void
-ConstChecker::visit (ReferenceType &)
-{}
+ConstChecker::visit (ReferenceType &type)
+{
+  if (const_context.is_in_context () && type.is_mut ())
+    rust_error_at (type.get_locus (),
+		   "mutable references are not allowed in constant functions");
+}
 
 void
 ConstChecker::visit (ArrayType &type)
diff --git a/gcc/testsuite/rust/compile/const10.rs b/gcc/testsuite/rust/compile/const10.rs
new file mode 100644
index 0000000..9ab8274
--- /dev/null
+++ b/gcc/testsuite/rust/compile/const10.rs
@@ -0,0 +1,3 @@
+const fn foo (a: &mut i32) { // { dg-error "mutable references are not allowed in constant functions" }
+	*a = 1;
+}