generate bindings for non-public extern items

Signed-off-by: Marin Veršić <marin.versic101@gmail.com>

src/bindgen/ir/global.rs

@@ -4,8 +4,6 @@
 
 use std::io::Write;
 
-use syn::ext::IdentExt;
-
 use crate::bindgen::cdecl;
 use crate::bindgen::config::Config;
 use crate::bindgen::declarationtyperesolver::DeclarationTypeResolver;
@@ -26,7 +24,11 @@ pub struct Static {
 }
 
 impl Static {
-    pub fn load(item: &syn::ItemStatic, mod_cfg: Option<&Cfg>) -> Result<Static, String> {
+    pub fn load(
+        path: Path,
+        item: &syn::ItemStatic,
+        mod_cfg: Option<&Cfg>,
+    ) -> Result<Static, String> {
         let ty = Type::load(&item.ty)?;
 
         if ty.is_none() {
@@ -34,7 +36,7 @@ impl Static {
         }
 
         Ok(Static::new(
-            Path::new(item.ident.unraw().to_string()),
+            path,
             ty.unwrap(),
             item.mutability.is_some(),
             Cfg::append(mod_cfg, Cfg::load(&item.attrs)),

src/bindgen/parser.rs

@@ -18,7 +18,7 @@ use crate::bindgen::ir::{
     AnnotationSet, Cfg, Constant, Documentation, Enum, Function, GenericParam, GenericParams,
     ItemMap, OpaqueItem, Path, Static, Struct, Type, Typedef, Union,
 };
-use crate::bindgen::utilities::{SynAbiHelpers, SynAttributeHelpers, SynItemFnHelpers};
+use crate::bindgen::utilities::{SynAbiHelpers, SynAttributeHelpers, SynItemHelpers};
 
 const STD_CRATES: &[&str] = &[
     "std",
@@ -643,7 +643,6 @@ impl Parse {
             item,
             Some(self_type),
             &item.sig,
-            &item.vis,
             &item.attrs,
         )
     }
@@ -665,7 +664,6 @@ impl Parse {
             item,
             None,
             &item.sig,
-            &item.vis,
             &item.attrs,
         );
     }
@@ -677,10 +675,9 @@ impl Parse {
         binding_crate_name: &str,
         crate_name: &str,
         mod_cfg: Option<&Cfg>,
-        named_symbol: &dyn SynItemFnHelpers,
+        named_symbol: &dyn SynItemHelpers,
         self_type: Option<&Path>,
         sig: &syn::Signature,
-        vis: &syn::Visibility,
         attrs: &[syn::Attribute],
     ) {
         if !config
@@ -707,53 +704,29 @@ impl Parse {
         let is_extern_c = sig.abi.is_omitted() || sig.abi.is_c();
         let exported_name = named_symbol.exported_name();
 
-        if let syn::Visibility::Public(_) = vis {
-            match (is_extern_c, exported_name) {
-                (true, Some(exported_name)) => {
-                    let path = Path::new(exported_name);
-                    match Function::load(path, self_type, sig, false, attrs, mod_cfg) {
-                        Ok(func) => {
-                            info!("Take {}.", loggable_item_name());
-                            self.functions.push(func);
-                        }
-                        Err(msg) => {
-                            error!("Cannot use fn {} ({}).", loggable_item_name(), msg);
-                        }
+        match (is_extern_c, exported_name) {
+            (true, Some(exported_name)) => {
+                let path = Path::new(exported_name);
+                match Function::load(path, self_type, sig, false, attrs, mod_cfg) {
+                    Ok(func) => {
+                        info!("Take {}.", loggable_item_name());
+                        self.functions.push(func);
+                    }
+                    Err(msg) => {
+                        error!("Cannot use fn {} ({}).", loggable_item_name(), msg);
                     }
                 }
-                (true, None) => {
-                    warn!(
-                        "Skipping {} - (not `no_mangle`, and has no `export_name` attribute)",
-                        loggable_item_name()
-                    );
-                }
-                (false, Some(_exported_name)) => {
-                    warn!("Skipping {} - (not `extern \"C\"`", loggable_item_name());
-                }
-                (false, None) => {}
             }
-        } else {
-            match (is_extern_c, exported_name) {
-                (true, Some(..)) => {
-                    warn!(
-                        "Skipping {} - (not `pub` but is `extern \"C\"` and `no_mangle`)",
-                        loggable_item_name()
-                    );
-                }
-                (true, None) => {
-                    warn!(
-                        "Skipping {} - (not `pub` but is `extern \"C\"`)",
-                        loggable_item_name()
-                    );
-                }
-                (false, Some(..)) => {
-                    warn!(
-                        "Skipping {} - (not `pub` but is `no_mangle`)",
-                        loggable_item_name()
-                    );
-                }
-                (false, None) => {}
+            (true, None) => {
+                warn!(
+                    "Skipping {} - (not `no_mangle`, and has no `export_name` attribute)",
+                    loggable_item_name()
+                );
             }
+            (false, Some(_exported_name)) => {
+                warn!("Skipping {} - (not `extern \"C\"`", loggable_item_name());
+            }
+            (false, None) => {}
         }
     }
 
@@ -892,27 +865,18 @@ impl Parse {
             return;
         }
 
-        if let syn::Visibility::Public(_) = item.vis {
-            if item.is_no_mangle() {
-                match Static::load(item, mod_cfg) {
-                    Ok(constant) => {
-                        info!("Take {}::{}.", crate_name, &item.ident);
-
-                        self.globals.try_insert(constant);
-                    }
-                    Err(msg) => {
-                        warn!("Skip {}::{} - ({})", crate_name, &item.ident, msg);
-                    }
+        if let Some(exported_name) = item.exported_name() {
+            let path = Path::new(exported_name);
+            match Static::load(path, item, mod_cfg) {
+                Ok(constant) => {
+                    info!("Take {}::{}.", crate_name, &item.ident);
+                    self.globals.try_insert(constant);
+                }
+                Err(msg) => {
+                    warn!("Skip {}::{} - ({})", crate_name, &item.ident, msg);
                 }
             }
-        }
-
-        // TODO
-        if let syn::Visibility::Public(_) = item.vis {
         } else {
-            warn!("Skip {}::{} - (not `pub`).", crate_name, &item.ident);
-        }
-        if !item.is_no_mangle() {
             warn!("Skip {}::{} - (not `no_mangle`).", crate_name, &item.ident);
         }
     }

src/bindgen/utilities.rs

@@ -30,11 +30,11 @@ where
     }
 }
 
-pub trait SynItemFnHelpers: SynAttributeHelpers {
+pub trait SynItemHelpers: SynAttributeHelpers {
     fn exported_name(&self) -> Option<String>;
 }
 
-impl SynItemFnHelpers for syn::ItemFn {
+impl SynItemHelpers for syn::ItemFn {
     fn exported_name(&self) -> Option<String> {
         self.attrs
             .attr_name_value_lookup("export_name")
@@ -48,7 +48,7 @@ impl SynItemFnHelpers for syn::ItemFn {
     }
 }
 
-impl SynItemFnHelpers for syn::ImplItemMethod {
+impl SynItemHelpers for syn::ImplItemMethod {
     fn exported_name(&self) -> Option<String> {
         self.attrs
             .attr_name_value_lookup("export_name")
@@ -62,6 +62,20 @@ impl SynItemFnHelpers for syn::ImplItemMethod {
     }
 }
 
+impl SynItemHelpers for syn::ItemStatic {
+    fn exported_name(&self) -> Option<String> {
+        self.attrs
+            .attr_name_value_lookup("export_name")
+            .or_else(|| {
+                if self.is_no_mangle() {
+                    Some(self.ident.unraw().to_string())
+                } else {
+                    None
+                }
+            })
+    }
+}
+
 /// Returns whether this attribute causes us to skip at item. This basically
 /// checks for `#[cfg(test)]`, `#[test]`, `/// cbindgen::ignore` and
 /// variations thereof.

tests/expectations/non_pub_extern.c

@@ -0,0 +1,12 @@
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+extern const uint32_t FIRST;
+
+extern const uint32_t RENAMED;
+
+void first(void);
+
+void renamed(void);

tests/expectations/non_pub_extern.compat.c

@@ -0,0 +1,20 @@
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif // __cplusplus
+
+extern const uint32_t FIRST;
+
+extern const uint32_t RENAMED;
+
+void first(void);
+
+void renamed(void);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif // __cplusplus

tests/expectations/non_pub_extern.cpp

@@ -0,0 +1,17 @@
+#include <cstdarg>
+#include <cstdint>
+#include <cstdlib>
+#include <ostream>
+#include <new>
+
+extern "C" {
+
+extern const uint32_t FIRST;
+
+extern const uint32_t RENAMED;
+
+void first();
+
+void renamed();
+
+} // extern "C"

tests/expectations/non_pub_extern.pyx

@@ -0,0 +1,15 @@
+from libc.stdint cimport int8_t, int16_t, int32_t, int64_t, intptr_t
+from libc.stdint cimport uint8_t, uint16_t, uint32_t, uint64_t, uintptr_t
+cdef extern from *:
+  ctypedef bint bool
+  ctypedef struct va_list
+
+cdef extern from *:
+
+  extern const uint32_t FIRST;
+
+  extern const uint32_t RENAMED;
+
+  void first();
+
+  void renamed();

tests/rust/non_pub_extern.rs

@@ -0,0 +1,13 @@
+#[no_mangle]
+static FIRST: u32 = 10;
+
+#[export_name = "RENAMED"]
+static SECOND: u32 = 42;
+
+#[no_mangle]
+extern "C" fn first()
+{ }
+
+#[export_name = "renamed"]
+extern fn second()
+{ }