Add missing error codes in libsyntax-ext asm

Author: GuillaumeGomez

src/libsyntax_ext/asm.rs

@@ -179,9 +179,11 @@ pub fn expand_asm<'cx>(cx: &'cx mut ExtCtxt,
                     let (constraint, _str_style) = panictry!(p.parse_str());
 
                     if constraint.as_str().starts_with("=") {
-                        cx.span_err(p.prev_span, "input operand constraint contains '='");
+                        span_err_if_not_stage0!(cx, p.prev_span, E0662,
+                                                "input operand constraint contains '='");
                     } else if constraint.as_str().starts_with("+") {
-                        cx.span_err(p.prev_span, "input operand constraint contains '+'");
+                        span_err_if_not_stage0!(cx, p.prev_span, E0663,
+                                                "input operand constraint contains '+'");
                     }
 
                     panictry!(p.expect(&token::OpenDelim(token::Paren)));
@@ -203,7 +205,8 @@ pub fn expand_asm<'cx>(cx: &'cx mut ExtCtxt,
                     if OPTIONS.iter().any(|&opt| s == opt) {
                         cx.span_warn(p.prev_span, "expected a clobber, found an option");
                     } else if s.as_str().starts_with("{") || s.as_str().ends_with("}") {
-                        cx.span_err(p.prev_span, "clobber should not be surrounded by braces");
+                        span_err_if_not_stage0!(cx, p.prev_span, E0664,
+                                                "clobber should not be surrounded by braces");
                     }
 
                     clobs.push(s);

src/libsyntax_ext/diagnostics.rs

@@ -38,6 +38,58 @@ let a;
 asm!("nop" : "r"(a));
 ```
 
+Considering that this would be a long explanation, we instead recommend you to
+take a look at the unstable book:
+https://doc.rust-lang.org/unstable-book/language-features/asm.html
+"##,
+
+E0662: r##"
+An invalid input operand constraint was passed to the `asm` macro (third line).
+
+Erroneous code example:
+
+```compile_fail,E0662
+asm!("xor %eax, %eax"
+     :
+     : "=test"("a")
+    );
+```
+
+Considering that this would be a long explanation, we instead recommend you to
+take a look at the unstable book:
+https://doc.rust-lang.org/unstable-book/language-features/asm.html
+"##,
+
+E0663: r##"
+An invalid input operand constraint was passed to the `asm` macro (third line).
+
+Erroneous code example:
+
+```compile_fail,E0663
+asm!("xor %eax, %eax"
+     :
+     : "+test"("a")
+    );
+```
+
+Considering that this would be a long explanation, we instead recommend you to
+take a look at the unstable book:
+https://doc.rust-lang.org/unstable-book/language-features/asm.html
+"##,
+
+E0664: r##"
+A clobber was surrounded by braces in the `asm` macro.
+
+Erroneous code example:
+
+```compile_fail,E0663
+asm!("mov $$0x200, %eax"
+     :
+     :
+     : "{eax}"
+    );
+```
+
 Considering that this would be a long explanation, we instead recommend you to
 take a look at the unstable book:
 https://doc.rust-lang.org/unstable-book/language-features/asm.html

src/test/ui/E0662.rs

@@ -0,0 +1,20 @@
+// Copyright 2018 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.
+
+// ignore-stage1
+
+#![feature(asm)]
+
+fn main() {
+    asm!("xor %eax, %eax"
+         :
+         : "=test"("a") //~ ERROR E0662
+        );
+}

src/test/ui/E0662.stderr

@@ -0,0 +1,9 @@
+error[E0662]: input operand constraint contains '='
+  --> $DIR/E0662.rs:18:12
+   |
+LL |          : "=test"("a") //~ ERROR E0662
+   |            ^^^^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0662`.

src/test/ui/E0663.rs

@@ -0,0 +1,20 @@
+// Copyright 2018 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.
+
+// ignore-stage1
+
+#![feature(asm)]
+
+fn main() {
+    asm!("xor %eax, %eax"
+         :
+         : "+test"("a") //~ ERROR E0663
+        );
+}

src/test/ui/E0663.stderr

@@ -0,0 +1,9 @@
+error[E0663]: input operand constraint contains '+'
+  --> $DIR/E0663.rs:18:12
+   |
+LL |          : "+test"("a") //~ ERROR E0663
+   |            ^^^^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0663`.

src/test/ui/E0664.rs

@@ -0,0 +1,21 @@
+// Copyright 2018 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.
+
+// ignore-stage1
+
+#![feature(asm)]
+
+fn main() {
+    asm!("mov $$0x200, %eax"
+         :
+         :
+         : "{eax}" //~ ERROR E0664
+        );
+}

src/test/ui/E0664.stderr

@@ -0,0 +1,9 @@
+error[E0664]: clobber should not be surrounded by braces
+  --> $DIR/E0664.rs:19:12
+   |
+LL |          : "{eax}" //~ ERROR E0664
+   |            ^^^^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0664`.