incr.comp. Add tests for stable span hashing.

src/test/incremental/source_loc_macros.rs

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+// 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.
+
+// This test makes sure that different expansions of the file!(), line!(),
+// column!() macros get picked up by the incr. comp. hash.
+
+// revisions:rpass1 rpass2
+
+// compile-flags: -Z query-dep-graph
+
+#![feature(rustc_attrs)]
+
+#[rustc_clean(label="Hir", cfg="rpass2")]
+fn line_same() {
+    let _ = line!();
+}
+
+#[rustc_clean(label="Hir", cfg="rpass2")]
+fn col_same() {
+    let _ = column!();
+}
+
+#[rustc_clean(label="Hir", cfg="rpass2")]
+fn file_same() {
+    let _ = file!();
+}
+
+#[cfg(rpass1)]
+fn line_different() {
+    let _ = line!();
+}
+
+#[cfg(rpass2)]
+#[rustc_dirty(label="Hir", cfg="rpass2")]
+fn line_different() {
+    let _ = line!();
+}
+
+#[cfg(rpass1)]
+fn col_different() {
+    let _ = column!();
+}
+
+#[cfg(rpass2)]
+#[rustc_dirty(label="Hir", cfg="rpass2")]
+fn col_different() {
+    let _ =        column!();
+}
+
+fn main() {
+    line_same();
+    line_different();
+    col_same();
+    col_different();
+    file_same();
+}

src/test/incremental/span_hash_stable/auxiliary/mod.rs

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+// 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.
+
+#[cfg(rpass1)]
+pub mod sub2;
+
+pub mod sub1;
+
+#[cfg(rpass2)]
+pub mod sub2;

src/test/incremental/span_hash_stable/auxiliary/sub1.rs

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+// 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.
+
+#[rustc_clean(label="Hir", cfg="rpass2")]
+pub struct SomeType {
+    pub x: u32,
+    pub y: i64,
+}

src/test/incremental/span_hash_stable/auxiliary/sub2.rs

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+// 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.
+
+#[rustc_clean(label="Hir", cfg="rpass2")]
+pub struct SomeOtherType {
+    pub a: i32,
+    pub b: u64,
+}

src/test/incremental/span_hash_stable/main.rs

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+// 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.
+
+// This test makes sure that it doesn't make a difference in which order we are
+// adding source files to the codemap. The order affects the BytePos values of
+// the spans and this test makes sure that we handle them correctly by hashing
+// file:line:column instead of raw byte offset.
+
+// revisions:rpass1 rpass2
+// compile-flags: -g -Z query-dep-graph
+
+#![feature(rustc_attrs)]
+
+mod auxiliary;
+
+fn main() {
+    let _ = auxiliary::sub1::SomeType {
+        x: 0,
+        y: 1,
+    };
+
+    let _ = auxiliary::sub2::SomeOtherType {
+        a: 2,
+        b: 3,
+    };
+}
+

src/test/incremental/spans_insignificant_w_o_debuginfo.rs

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+// 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.
+
+// This test makes sure that just changing a definition's location in the
+// source file does *not* change its incr. comp. hash, if debuginfo is disabled.
+
+// revisions:rpass1 rpass2
+
+// compile-flags: -Z query-dep-graph
+
+#![feature(rustc_attrs)]
+
+#[cfg(rpass1)]
+pub fn main() {}
+
+#[cfg(rpass2)]
+#[rustc_clean(label="Hir", cfg="rpass2")]
+pub fn main() {}

src/test/incremental/spans_significant_w_debuginfo.rs

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+// 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.
+
+// This test makes sure that just changing a definition's location in the
+// source file also changes its incr. comp. hash, if debuginfo is enabled.
+
+// revisions:rpass1 rpass2
+
+// compile-flags: -g -Z query-dep-graph
+
+#![feature(rustc_attrs)]
+
+#[cfg(rpass1)]
+pub fn main() {}
+
+#[cfg(rpass2)]
+#[rustc_dirty(label="Hir", cfg="rpass2")]
+pub fn main() {}