6 files changed, 183 insertions, 0 deletions
diff --git a/src/test/ui/abi/foreign/auxiliary/foreign_lib.rs b/src/test/ui/abi/foreign/auxiliary/foreign_lib.rs
new file mode 100644
index 000000000..3c649b778
--- /dev/null
+++ b/src/test/ui/abi/foreign/auxiliary/foreign_lib.rs
@@ -0,0 +1,37 @@
+#![crate_name = "foreign_lib"]
+#![feature(rustc_private)]
+
+pub mod rustrt {
+    extern crate libc;
+
+    #[link(name = "rust_test_helpers", kind = "static")]
+    extern "C" {
+        pub fn rust_get_test_int() -> libc::intptr_t;
+    }
+}
+
+pub mod rustrt2 {
+    extern crate libc;
+
+    extern "C" {
+        pub fn rust_get_test_int() -> libc::intptr_t;
+    }
+}
+
+pub mod rustrt3 {
+    // Different type, but same ABI (on all supported platforms).
+    // Ensures that we don't ICE or trigger LLVM asserts when
+    // importing the same symbol under different types.
+    // See https://github.com/rust-lang/rust/issues/32740.
+    extern "C" {
+        pub fn rust_get_test_int() -> *const u8;
+    }
+}
+
+pub fn local_uses() {
+    unsafe {
+        let x = rustrt::rust_get_test_int();
+        assert_eq!(x, rustrt2::rust_get_test_int());
+        assert_eq!(x as *const _, rustrt3::rust_get_test_int());
+    }
+}
diff --git a/src/test/ui/abi/foreign/foreign-call-no-runtime.rs b/src/test/ui/abi/foreign/foreign-call-no-runtime.rs
new file mode 100644
index 000000000..d5b90a359
--- /dev/null
+++ b/src/test/ui/abi/foreign/foreign-call-no-runtime.rs
@@ -0,0 +1,60 @@
+// run-pass
+// ignore-emscripten no threads support
+
+#![feature(rustc_private)]
+
+extern crate libc;
+
+use std::mem;
+use std::thread;
+
+#[link(name = "rust_test_helpers", kind = "static")]
+extern "C" {
+    fn rust_dbg_call(cb: extern "C" fn(libc::uintptr_t), data: libc::uintptr_t) -> libc::uintptr_t;
+}
+
+pub fn main() {
+    unsafe {
+        thread::spawn(move || {
+            let i: isize = 100;
+            rust_dbg_call(callback_isize, mem::transmute(&i));
+        })
+        .join()
+        .unwrap();
+
+        thread::spawn(move || {
+            let i: i32 = 100;
+            rust_dbg_call(callback_i32, mem::transmute(&i));
+        })
+        .join()
+        .unwrap();
+
+        thread::spawn(move || {
+            let i: i64 = 100;
+            rust_dbg_call(callback_i64, mem::transmute(&i));
+        })
+        .join()
+        .unwrap();
+    }
+}
+
+extern "C" fn callback_isize(data: libc::uintptr_t) {
+    unsafe {
+        let data: *const isize = mem::transmute(data);
+        assert_eq!(*data, 100);
+    }
+}
+
+extern "C" fn callback_i64(data: libc::uintptr_t) {
+    unsafe {
+        let data: *const i64 = mem::transmute(data);
+        assert_eq!(*data, 100);
+    }
+}
+
+extern "C" fn callback_i32(data: libc::uintptr_t) {
+    unsafe {
+        let data: *const i32 = mem::transmute(data);
+        assert_eq!(*data, 100);
+    }
+}
diff --git a/src/test/ui/abi/foreign/foreign-dupe.rs b/src/test/ui/abi/foreign/foreign-dupe.rs
new file mode 100644
index 000000000..3c9f0f583
--- /dev/null
+++ b/src/test/ui/abi/foreign/foreign-dupe.rs
@@ -0,0 +1,17 @@
+// run-pass
+// aux-build:foreign_lib.rs
+// ignore-wasm32-bare no libc to test ffi with
+
+// Check that we can still call duplicated extern (imported) functions
+// which were declared in another crate. See issues #32740 and #32783.
+
+
+extern crate foreign_lib;
+
+pub fn main() {
+    unsafe {
+        let x = foreign_lib::rustrt::rust_get_test_int();
+        assert_eq!(x, foreign_lib::rustrt2::rust_get_test_int());
+        assert_eq!(x as *const _, foreign_lib::rustrt3::rust_get_test_int());
+    }
+}
diff --git a/src/test/ui/abi/foreign/foreign-fn-with-byval.rs b/src/test/ui/abi/foreign/foreign-fn-with-byval.rs
new file mode 100644
index 000000000..f366b6ee1
--- /dev/null
+++ b/src/test/ui/abi/foreign/foreign-fn-with-byval.rs
@@ -0,0 +1,30 @@
+// run-pass
+#![allow(improper_ctypes)]
+
+// ignore-wasm32-bare no libc to test ffi with
+
+#[derive(Copy, Clone)]
+pub struct S {
+    x: u64,
+    y: u64,
+    z: u64,
+}
+
+#[link(name = "rust_test_helpers", kind = "static")]
+extern "C" {
+    pub fn get_x(x: S) -> u64;
+    pub fn get_y(x: S) -> u64;
+    pub fn get_z(x: S) -> u64;
+}
+
+#[inline(never)]
+fn indirect_call(func: unsafe extern "C" fn(s: S) -> u64, s: S) -> u64 {
+    unsafe { func(s) }
+}
+
+fn main() {
+    let s = S { x: 1, y: 2, z: 3 };
+    assert_eq!(s.x, indirect_call(get_x, s));
+    assert_eq!(s.y, indirect_call(get_y, s));
+    assert_eq!(s.z, indirect_call(get_z, s));
+}
diff --git a/src/test/ui/abi/foreign/foreign-no-abi.rs b/src/test/ui/abi/foreign/foreign-no-abi.rs
new file mode 100644
index 000000000..3f4f70c99
--- /dev/null
+++ b/src/test/ui/abi/foreign/foreign-no-abi.rs
@@ -0,0 +1,22 @@
+// run-pass
+// ABI is cdecl by default
+
+// ignore-wasm32-bare no libc to test ffi with
+// pretty-expanded FIXME #23616
+
+#![feature(rustc_private)]
+
+mod rustrt {
+    extern crate libc;
+
+    #[link(name = "rust_test_helpers", kind = "static")]
+    extern "C" {
+        pub fn rust_get_test_int() -> libc::intptr_t;
+    }
+}
+
+pub fn main() {
+    unsafe {
+        rustrt::rust_get_test_int();
+    }
+}
diff --git a/src/test/ui/abi/foreign/invoke-external-foreign.rs b/src/test/ui/abi/foreign/invoke-external-foreign.rs
new file mode 100644
index 000000000..dbd2b4ad8
--- /dev/null
+++ b/src/test/ui/abi/foreign/invoke-external-foreign.rs
@@ -0,0 +1,17 @@
+// run-pass
+// aux-build:foreign_lib.rs
+// ignore-wasm32-bare no libc to test ffi with
+
+// The purpose of this test is to check that we can
+// successfully (and safely) invoke external, cdecl
+// functions from outside the crate.
+
+// pretty-expanded FIXME #23616
+
+extern crate foreign_lib;
+
+pub fn main() {
+    unsafe {
+        let _foo = foreign_lib::rustrt::rust_get_test_int();
+    }
+}