Squashed 'third_party/autocxx/' changes from 629e8fa53..c35090b75

c35090b75 Merge pull request #1131 from google/rev-0.22.3
94f20d716 Revise to 0.22.3.
b4776fdd5 Merge pull request #1070 from google/reference-wrapper
25f08f567 Better encapsulate TypeConversionPolicy. No functional changes.
b389afdeb Add reference wrapper safety policy.
cd169853b Merge pull request #1126 from google/issue-1125
92f48fa30 Merge pull request #1123 from google/segfault-detection
ca60bacca Add comment
724a4971d Add test for issue 1125.
d8a9a8ca7 Detect segfaults in reduction
e147efc7c Merge pull request #1122 from google/rev-0.22.2
dfa9b99a4 Revise to 0.22.2.
4cb1da848 Merge pull request #1120 from chbaker0/main
79afb97d9 Replace lingering tempdir usages with tempfile
f945331a3 Merge pull request #1118 from google/fix-test-fixed-num
5a8b28751 Merge pull request #1117 from google/docs-tweaks
b5486faa1 Merge pull request #1109 from bsilver8192/bindgen-skip-rustfmt
f62c17273 Fix faulty test_fixed_num test.
ad954fa72 Minor doc updates.
eaa1f8737 Leave bindgen enabled when logging is
bdff5db56 Merge pull request #1110 from bsilver8192/subclass-std
922f98be4 Merge pull request #1111 from bsilver8192/subclass-unsafe
bfbcc6b94 Merge pull request #1114 from google/rev-0.22.1
4f68a2e59 Merge pull request #1112 from bsilver8192/subclass-upcast-uniqueptr
993c5705b Revise to 0.22.1.
7bf667bbf Add a function to upcast UniquePtr
733d751a2 Fix clippy and docs
8023cee43 Fix and test subclass without `safety!(unsafe)`
4ae4d47e4 Fix and test subclasses with C++ std in scope
c50b1ee7e Tell bindgen to skip rustfmt
f9b24b90e Merge pull request #1107 from google/reject-anon-namespace-typedefs
070c9755d Merge pull request #1093 from google/always-output-rs
8eb71c5e7 Merge pull request #1095 from google/issue-1094
c86f1ce7e Reject forward declared nested types.
c118dba64 Merge branch 'main' into reject-anon-namespace-typedefs
243079997 Merge pull request #1108 from google/reject-type-param-typedefs
f803c3ba5 Reject type params - fixes #1098
f3381ba52 Reject typedefs to anon namespaces.
669d932a7 Merge pull request #1106 from google/lotsa-failing-tests
f0e8487fe Marking tests as ignored.
524c2bbfc Add tests for multiple issues.
67e16ac2a Merge branch 'main' of github.com:google/autocxx into always-output-rs
5f62daf3f Merge pull request #1104 from google/roll-cxx
43ee55ca2 Further upgrade from 1.0.67 to 1.0.68
e29e3c899 Merge pull request #1100 from bsilver8192/extern_cpp_type-namespace
d2c8edef4 Merge pull request #1101 from google/fix-1081
094dbd957 Roll cxx minimal version.
94c39f35b Merge pull request #1102 from google/fix-book-build
8764f1218 Alter mdbook-mermaid installation.
85543656f Test for issue 1081
b170df056 Fix and test extern_cpp_type with type in a C++ namespace
e4b56dd49 Fix gen tests.
5457e615d Fix #1092.

git-subtree-dir: third_party/autocxx
git-subtree-split: c35090b754619531b4eebdf4d8b583db72349943
Signed-off-by: Brian Silverman <bsilver16384@gmail.com>
Change-Id: Ia34285bc1c30f7e3c71fa9e7b677a58902648843
diff --git a/parser/src/config.rs b/parser/src/config.rs
index 4204acf..8d30249 100644
--- a/parser/src/config.rs
+++ b/parser/src/config.rs
@@ -33,6 +33,7 @@
 pub enum UnsafePolicy {
     AllFunctionsSafe,
     AllFunctionsUnsafe,
+    ReferencesWrappedAllFunctionsSafe,
 }
 
 impl Default for UnsafePolicy {
@@ -50,8 +51,13 @@
             Some(id) => {
                 if id == "unsafe_ffi" {
                     Ok(UnsafePolicy::AllFunctionsSafe)
+                } else if id == "unsafe_references_wrapped" {
+                    Ok(UnsafePolicy::ReferencesWrappedAllFunctionsSafe)
                 } else {
-                    Err(syn::Error::new(id.span(), "expected unsafe_ffi"))
+                    Err(syn::Error::new(
+                        id.span(),
+                        "expected unsafe_ffi or unsafe_references_wrapped",
+                    ))
                 }
             }
             None => Ok(UnsafePolicy::AllFunctionsUnsafe),
@@ -70,10 +76,20 @@
     fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
         if *self == UnsafePolicy::AllFunctionsSafe {
             tokens.extend(quote! { unsafe })
+        } else if *self == UnsafePolicy::ReferencesWrappedAllFunctionsSafe {
+            tokens.extend(quote! { unsafe_references_wrapped })
         }
     }
 }
 
+impl UnsafePolicy {
+    /// Whether we are treating C++ references as a different thing from Rust
+    /// references and therefore have to generate lots of code for a CppRef type
+    pub fn requires_cpprefs(&self) -> bool {
+        matches!(self, Self::ReferencesWrappedAllFunctionsSafe)
+    }
+}
+
 /// An entry in the allowlist.
 #[derive(Hash, Debug)]
 pub enum AllowlistEntry {