Add test to ensure that atomic types are lock-free

src/test/run-make/atomic-lock-free/Makefile

@@ -0,0 +1,30 @@
+-include ../tools.mk
+
+# This tests ensure that atomic types are never lowered into runtime library calls that are not
+# guaranteed to be lock-free.
+
+all:
+ifeq ($(UNAME),Linux)
+	$(RUSTC) --target=i686-unknown-linux-gnu atomic_lock_free.rs
+	nm "$(TMPDIR)/libatomic_lock_free.rlib" | grep -vq __atomic_fetch_add
+	$(RUSTC) --target=x86_64-unknown-linux-gnu atomic_lock_free.rs
+	nm "$(TMPDIR)/libatomic_lock_free.rlib" | grep -vq __atomic_fetch_add
+	$(RUSTC) --target=arm-unknown-linux-gnueabi atomic_lock_free.rs
+	nm "$(TMPDIR)/libatomic_lock_free.rlib" | grep -vq __atomic_fetch_add
+	$(RUSTC) --target=arm-unknown-linux-gnueabihf atomic_lock_free.rs
+	nm "$(TMPDIR)/libatomic_lock_free.rlib" | grep -vq __atomic_fetch_add
+	$(RUSTC) --target=armv7-unknown-linux-gnueabihf atomic_lock_free.rs
+	nm "$(TMPDIR)/libatomic_lock_free.rlib" | grep -vq __atomic_fetch_add
+	$(RUSTC) --target=aarch64-unknown-linux-gnu atomic_lock_free.rs
+	nm "$(TMPDIR)/libatomic_lock_free.rlib" | grep -vq __atomic_fetch_add
+	$(RUSTC) --target=mips-unknown-linux-gnu atomic_lock_free.rs
+	nm "$(TMPDIR)/libatomic_lock_free.rlib" | grep -vq __atomic_fetch_add
+	$(RUSTC) --target=mipsel-unknown-linux-gnu atomic_lock_free.rs
+	nm "$(TMPDIR)/libatomic_lock_free.rlib" | grep -vq __atomic_fetch_add
+	$(RUSTC) --target=powerpc-unknown-linux-gnu atomic_lock_free.rs
+	nm "$(TMPDIR)/libatomic_lock_free.rlib" | grep -vq __atomic_fetch_add
+	$(RUSTC) --target=powerpc64-unknown-linux-gnu atomic_lock_free.rs
+	nm "$(TMPDIR)/libatomic_lock_free.rlib" | grep -vq __atomic_fetch_add
+	$(RUSTC) --target=powerpc64le-unknown-linux-gnu atomic_lock_free.rs
+	nm "$(TMPDIR)/libatomic_lock_free.rlib" | grep -vq __atomic_fetch_add
+endif

src/test/run-make/atomic-lock-free/atomic_lock_free.rs

@@ -0,0 +1,62 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![feature(cfg_target_has_atomic, no_core, intrinsics, lang_items)]
+#![crate_type="rlib"]
+#![no_core]
+
+extern "rust-intrinsic" {
+    fn atomic_xadd<T>(dst: *mut T, src: T) -> T;
+}
+
+#[lang = "sized"]
+trait Sized {}
+
+#[cfg(target_has_atomic = "8")]
+pub unsafe fn atomic_u8(x: *mut u8) {
+    atomic_xadd(x, 1);
+    atomic_xadd(x, 1);
+}
+#[cfg(target_has_atomic = "8")]
+pub unsafe fn atomic_i8(x: *mut i8) {
+    atomic_xadd(x, 1);
+}
+#[cfg(target_has_atomic = "16")]
+pub unsafe fn atomic_u16(x: *mut u16) {
+    atomic_xadd(x, 1);
+}
+#[cfg(target_has_atomic = "16")]
+pub unsafe fn atomic_i16(x: *mut i16) {
+    atomic_xadd(x, 1);
+}
+#[cfg(target_has_atomic = "32")]
+pub unsafe fn atomic_u32(x: *mut u32) {
+    atomic_xadd(x, 1);
+}
+#[cfg(target_has_atomic = "32")]
+pub unsafe fn atomic_i32(x: *mut i32) {
+    atomic_xadd(x, 1);
+}
+#[cfg(target_has_atomic = "64")]
+pub unsafe fn atomic_u64(x: *mut u64) {
+    atomic_xadd(x, 1);
+}
+#[cfg(target_has_atomic = "64")]
+pub unsafe fn atomic_i64(x: *mut i64) {
+    atomic_xadd(x, 1);
+}
+#[cfg(target_has_atomic = "ptr")]
+pub unsafe fn atomic_usize(x: *mut usize) {
+    atomic_xadd(x, 1);
+}
+#[cfg(target_has_atomic = "ptr")]
+pub unsafe fn atomic_isize(x: *mut isize) {
+    atomic_xadd(x, 1);
+}