add crate name to mir dumps

fuckyou.rb

@@ -0,0 +1,7 @@
+Dir.glob('src/test/mir-opt/**/*.rs').each do |f|
+  puts f
+  t = File.read(f)
+  b = File.basename(f, ".rs")
+  t.gsub!(/\/\/ EMIT_MIR rustc/, "// EMIT_MIR " + b)
+  File.open(f, "w") { |f| f.puts t }
+end

omg.mir

@@ -0,0 +1,2 @@
+// EMIT_MIR rustc.OMG
+test 123

src/librustc_mir/util/pretty.rs

@@ -177,6 +177,7 @@ fn dump_path(
     let mut file_path = PathBuf::new();
     file_path.push(Path::new(&tcx.sess.opts.debugging_opts.dump_mir_dir));
 
+    let crate_name = tcx.crate_name(source.def_id().krate);
     let item_name = tcx.def_path(source.def_id()).to_filename_friendly_no_crate();
     // All drop shims have the same DefId, so we have to add the type
     // to get unique file names.
@@ -196,7 +197,7 @@ fn dump_path(
     };
 
     let file_name = format!(
-        "rustc.{}{}{}{}.{}.{}.{}",
+        "{}.{}{}{}{}.{}.{}.{}", crate_name,
         item_name, shim_disambiguator, promotion_id, pass_num, pass_name, disambiguator, extension,
     );
 

src/test/mir-opt/address-of.rs

@@ -1,4 +1,4 @@
-// EMIT_MIR rustc.address_of_reborrow.SimplifyCfg-initial.after.mir
+// EMIT_MIR address_of.address_of_reborrow.SimplifyCfg-initial.after.mir
 
 fn address_of_reborrow() {
     let y = &[0; 10];
@@ -37,7 +37,7 @@ fn address_of_reborrow() {
 }
 
 // The normal borrows here should be preserved
-// EMIT_MIR rustc.borrow_and_cast.SimplifyCfg-initial.after.mir
+// EMIT_MIR address_of.borrow_and_cast.SimplifyCfg-initial.after.mir
 fn borrow_and_cast(mut x: i32) {
     let p = &x as *const i32;
     let q = &mut x as *const i32;

src/test/mir-opt/array-index-is-temporary.rs

@@ -8,7 +8,7 @@ unsafe fn foo(z: *mut usize) -> u32 {
 }
 
 // EMIT_MIR_FOR_EACH_BIT_WIDTH
-// EMIT_MIR rustc.main.SimplifyCfg-elaborate-drops.after.mir
+// EMIT_MIR array_index_is_temporary.main.SimplifyCfg-elaborate-drops.after.mir
 fn main() {
     let mut x = [42, 43, 44];
     let mut y = 1;

src/test/mir-opt/basic_assignment.rs

@@ -1,6 +1,6 @@
 // this tests move up progration, which is not yet implemented
 
-// EMIT_MIR rustc.main.SimplifyCfg-initial.after.mir
+// EMIT_MIR basic_assignment.main.SimplifyCfg-initial.after.mir
 
 // Check codegen for assignments (`a = b`) where the left-hand-side is
 // not yet initialized. Assignments tend to be absent in simple code,

src/test/mir-opt/box_expr.rs

@@ -2,7 +2,7 @@
 
 #![feature(box_syntax)]
 
-// EMIT_MIR rustc.main.ElaborateDrops.before.mir
+// EMIT_MIR box_expr.main.ElaborateDrops.before.mir
 fn main() {
     let x = box S::new();
     drop(x);

src/test/mir-opt/byte_slice.rs

@@ -1,6 +1,6 @@
 // compile-flags: -Z mir-opt-level=0
 
-// EMIT_MIR rustc.main.SimplifyCfg-elaborate-drops.after.mir
+// EMIT_MIR byte_slice.main.SimplifyCfg-elaborate-drops.after.mir
 fn main() {
     let x = b"foo";
     let y = [5u8, b'x'];

src/test/mir-opt/combine_array_len.rs

@@ -1,5 +1,5 @@
 // EMIT_MIR_FOR_EACH_BIT_WIDTH
-// EMIT_MIR rustc.norm2.InstCombine.diff
+// EMIT_MIR combine_array_len.norm2.InstCombine.diff
 
 fn norm2(x: [f32; 2]) -> f32 {
     let a = x[0];

src/test/mir-opt/const-promotion-extern-static.rs

@@ -4,12 +4,12 @@ extern "C" {
 
 static Y: i32 = 42;
 
-// EMIT_MIR rustc.BAR.PromoteTemps.diff
-// EMIT_MIR rustc.BAR-promoted[0].ConstProp.after.mir
+// EMIT_MIR const_promotion_extern_static.BAR.PromoteTemps.diff
+// EMIT_MIR const_promotion_extern_static.BAR-promoted[0].ConstProp.after.mir
 static mut BAR: *const &i32 = [&Y].as_ptr();
 
-// EMIT_MIR rustc.FOO.PromoteTemps.diff
-// EMIT_MIR rustc.FOO-promoted[0].ConstProp.after.mir
+// EMIT_MIR const_promotion_extern_static.FOO.PromoteTemps.diff
+// EMIT_MIR const_promotion_extern_static.FOO-promoted[0].ConstProp.after.mir
 static mut FOO: *const &i32 = [unsafe { &X }].as_ptr();
 
 fn main() {}

src/test/mir-opt/const_allocation.rs

@@ -3,7 +3,7 @@
 static FOO: &[(Option<i32>, &[&str])] =
     &[(None, &[]), (None, &["foo", "bar"]), (Some(42), &["meh", "mop", "möp"])];
 
-// EMIT_MIR rustc.main.ConstProp.after.mir
+// EMIT_MIR const_allocation.main.ConstProp.after.mir
 fn main() {
     FOO;
 }

src/test/mir-opt/const_allocation2.rs

@@ -1,6 +1,6 @@
 // EMIT_MIR_FOR_EACH_BIT_WIDTH
 
-// EMIT_MIR rustc.main.ConstProp.after.mir
+// EMIT_MIR const_allocation2.main.ConstProp.after.mir
 fn main() {
     FOO;
 }

src/test/mir-opt/const_allocation3.rs

@@ -1,6 +1,6 @@
 // EMIT_MIR_FOR_EACH_BIT_WIDTH
 
-// EMIT_MIR rustc.main.ConstProp.after.mir
+// EMIT_MIR const_allocation3.main.ConstProp.after.mir
 fn main() {
     FOO;
 }

src/test/mir-opt/const_prop/aggregate.rs

@@ -1,6 +1,6 @@
 // compile-flags: -O
 
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR aggregate.main.ConstProp.diff
 fn main() {
     let x = (0, 1, 2).1 + 0;
 }

src/test/mir-opt/const_prop/array_index.rs

@@ -1,6 +1,6 @@
 // EMIT_MIR_FOR_EACH_BIT_WIDTH
 
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR array_index.main.ConstProp.diff
 fn main() {
     let x: u32 = [0, 1, 2, 3][2];
 }

src/test/mir-opt/const_prop/bad_op_div_by_zero.rs

@@ -1,4 +1,4 @@
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR bad_op_div_by_zero.main.ConstProp.diff
 #[allow(unconditional_panic)]
 fn main() {
     let y = 0;

src/test/mir-opt/const_prop/bad_op_mod_by_zero.rs

@@ -1,4 +1,4 @@
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR bad_op_mod_by_zero.main.ConstProp.diff
 #[allow(unconditional_panic)]
 fn main() {
     let y = 0;

src/test/mir-opt/const_prop/bad_op_unsafe_oob_for_slices.rs

@@ -1,5 +1,5 @@
 // EMIT_MIR_FOR_EACH_BIT_WIDTH
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR bad_op_unsafe_oob_for_slices.main.ConstProp.diff
 #[allow(unconditional_panic)]
 fn main() {
     let a: *const [_] = &[1, 2, 3];

src/test/mir-opt/const_prop/boolean_identities.rs

@@ -1,6 +1,6 @@
 // compile-flags: -O -Zmir-opt-level=3
 
-// EMIT_MIR rustc.test.ConstProp.diff
+// EMIT_MIR boolean_identities.test.ConstProp.diff
 pub fn test(x: bool, y: bool) -> bool {
     (y | true) & (x & false)
 }

src/test/mir-opt/const_prop/boxes.rs

@@ -7,7 +7,7 @@
 
 // Note: this test verifies that we, in fact, do not const prop `box`
 
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR boxes.main.ConstProp.diff
 fn main() {
     let x = *(box 42) + 0;
 }

src/test/mir-opt/const_prop/cast.rs

@@ -1,4 +1,4 @@
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR cast.main.ConstProp.diff
 
 fn main() {
     let x = 42u8 as u32;

src/test/mir-opt/const_prop/checked_add.rs

@@ -1,6 +1,6 @@
 // compile-flags: -C overflow-checks=on
 
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR checked_add.main.ConstProp.diff
 fn main() {
     let x: u32 = 1 + 1;
 }

src/test/mir-opt/const_prop/const_prop_fails_gracefully.rs

@@ -1,7 +1,7 @@
 #[inline(never)]
 fn read(_: usize) { }
 
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR const_prop_fails_gracefully.main.ConstProp.diff
 fn main() {
     const FOO: &i32 = &1;
     let x = FOO as *const i32 as usize;

src/test/mir-opt/const_prop/control-flow-simplification.rs

@@ -6,8 +6,8 @@ trait NeedsDrop:Sized{
 
 impl<This> NeedsDrop for This{}
 
-// EMIT_MIR rustc.hello.ConstProp.diff
-// EMIT_MIR rustc.hello.PreCodegen.before.mir
+// EMIT_MIR control_flow_simplification.hello.ConstProp.diff
+// EMIT_MIR control_flow_simplification.hello.PreCodegen.before.mir
 fn hello<T>(){
     if <bool>::NEEDS {
         panic!()

src/test/mir-opt/const_prop/discriminant.rs

@@ -6,7 +6,7 @@
 // Fixing either of those will allow us to const-prop this away.
 
 // EMIT_MIR_FOR_EACH_BIT_WIDTH
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR discriminant.main.ConstProp.diff
 fn main() {
     let x = (if let Some(true) = Some(true) { 42 } else { 10 }) + 0;
 }

src/test/mir-opt/const_prop/indirect.rs

@@ -1,6 +1,6 @@
 // compile-flags: -C overflow-checks=on
 
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR indirect.main.ConstProp.diff
 fn main() {
     let x = (2u32 as u8) + 1;
 }

src/test/mir-opt/const_prop/issue-66971.rs

@@ -11,7 +11,7 @@ fn encode(this: ((), u8, u8)) {
     assert!(this.2 == 0);
 }
 
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR issue_66971.main.ConstProp.diff
 fn main() {
     encode(((), 0, 0));
 }

src/test/mir-opt/const_prop/issue-67019.rs

@@ -6,7 +6,7 @@ fn test(this: ((u8, u8),)) {
     assert!((this.0).0 == 1);
 }
 
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR issue_67019.main.ConstProp.diff
 fn main() {
     test(((1, 2),));
 }

src/test/mir-opt/const_prop/mult_by_zero.rs

@@ -1,6 +1,6 @@
 // compile-flags: -O -Zmir-opt-level=3
 
-// EMIT_MIR rustc.test.ConstProp.diff
+// EMIT_MIR mult_by_zero.test.ConstProp.diff
 fn test(x : i32) -> i32 {
   x * 0
 }

src/test/mir-opt/const_prop/mutable_variable.rs

@@ -1,6 +1,6 @@
 // compile-flags: -O
 
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR mutable_variable.main.ConstProp.diff
 fn main() {
     let mut x = 42;
     x = 99;

src/test/mir-opt/const_prop/mutable_variable_aggregate.rs

@@ -1,6 +1,6 @@
 // compile-flags: -O
 
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR mutable_variable_aggregate.main.ConstProp.diff
 fn main() {
     let mut x = (42, 43);
     x.1 = 99;

src/test/mir-opt/const_prop/mutable_variable_aggregate_mut_ref.rs

@@ -1,6 +1,6 @@
 // compile-flags: -O
 
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR mutable_variable_aggregate_mut_ref.main.ConstProp.diff
 fn main() {
     let mut x = (42, 43);
     let z = &mut x;

src/test/mir-opt/const_prop/mutable_variable_aggregate_partial_read.rs

@@ -1,6 +1,6 @@
 // compile-flags: -O
 
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR mutable_variable_aggregate_partial_read.main.ConstProp.diff
 fn main() {
     let mut x: (i32, i32) = foo();
     x.1 = 99;

src/test/mir-opt/const_prop/mutable_variable_no_prop.rs

@@ -2,7 +2,7 @@
 
 static mut STATIC: u32 = 42;
 
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR mutable_variable_no_prop.main.ConstProp.diff
 fn main() {
     let mut x = 42;
     unsafe {

src/test/mir-opt/const_prop/mutable_variable_unprop_assign.rs

@@ -1,6 +1,6 @@
 // compile-flags: -O
 
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR mutable_variable_unprop_assign.main.ConstProp.diff
 fn main() {
     let a = foo();
     let mut x: (i32, i32) = (1, 2);

src/test/mir-opt/const_prop/optimizes_into_variable.rs

@@ -6,8 +6,8 @@ struct Point {
 }
 
 // EMIT_MIR_FOR_EACH_BIT_WIDTH
-// EMIT_MIR rustc.main.ConstProp.diff
-// EMIT_MIR rustc.main.SimplifyLocals.after.mir
+// EMIT_MIR optimizes_into_variable.main.ConstProp.diff
+// EMIT_MIR optimizes_into_variable.main.SimplifyLocals.after.mir
 fn main() {
     let x = 2 + 2;
     let y = [0, 1, 2, 3, 4, 5][3];

src/test/mir-opt/const_prop/read_immutable_static.rs

@@ -2,7 +2,7 @@
 
 static FOO: u8 = 2;
 
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR read_immutable_static.main.ConstProp.diff
 fn main() {
     let x = FOO + FOO;
 }

src/test/mir-opt/const_prop/ref_deref.rs

@@ -1,5 +1,5 @@
-// EMIT_MIR rustc.main.PromoteTemps.diff
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR ref_deref.main.PromoteTemps.diff
+// EMIT_MIR ref_deref.main.ConstProp.diff
 
 fn main() {
     *(&4);

src/test/mir-opt/const_prop/ref_deref_project.rs

@@ -1,5 +1,5 @@
-// EMIT_MIR rustc.main.PromoteTemps.diff
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR ref_deref_project.main.PromoteTemps.diff
+// EMIT_MIR ref_deref_project.main.ConstProp.diff
 
 fn main() {
     *(&(4, 5).1); // This does not currently propagate (#67862)

src/test/mir-opt/const_prop/reify_fn_ptr.rs

@@ -1,4 +1,4 @@
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR reify_fn_ptr.main.ConstProp.diff
 
 fn main() {
     let _ = main as usize as *const fn();

src/test/mir-opt/const_prop/repeat.rs

@@ -1,7 +1,7 @@
 // compile-flags: -O
 
 // EMIT_MIR_FOR_EACH_BIT_WIDTH
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR repeat.main.ConstProp.diff
 fn main() {
     let x: u32 = [42; 8][2] + 0;
 }

src/test/mir-opt/const_prop/return_place.rs

@@ -1,7 +1,7 @@
 // compile-flags: -C overflow-checks=on
 
-// EMIT_MIR rustc.add.ConstProp.diff
-// EMIT_MIR rustc.add.PreCodegen.before.mir
+// EMIT_MIR return_place.add.ConstProp.diff
+// EMIT_MIR return_place.add.PreCodegen.before.mir
 fn add() -> u32 {
     2 + 2
 }

src/test/mir-opt/const_prop/scalar_literal_propagation.rs

@@ -1,4 +1,4 @@
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR scalar_literal_propagation.main.ConstProp.diff
 fn main() {
     let x = 1;
     consume(x);

src/test/mir-opt/const_prop/slice_len.rs

@@ -1,6 +1,6 @@
 // EMIT_MIR_FOR_EACH_BIT_WIDTH
 
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR slice_len.main.ConstProp.diff
 fn main() {
     (&[1u32, 2, 3] as &[u32])[1];
 }

src/test/mir-opt/const_prop/switch_int.rs

@@ -1,8 +1,8 @@
 #[inline(never)]
 fn foo(_: i32) { }
 
-// EMIT_MIR rustc.main.ConstProp.diff
-// EMIT_MIR rustc.main.SimplifyBranches-after-const-prop.diff
+// EMIT_MIR switch_int.main.ConstProp.diff
+// EMIT_MIR switch_int.main.SimplifyBranches-after-const-prop.diff
 fn main() {
     match 1 {
         1 => foo(0),

src/test/mir-opt/const_prop/tuple_literal_propagation.rs

@@ -1,4 +1,4 @@
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR tuple_literal_propagation.main.ConstProp.diff
 fn main() {
     let x = (1, 2);
 

src/test/mir-opt/const_prop_miscompile.rs

@@ -1,13 +1,13 @@
 #![feature(raw_ref_op)]
 
-// EMIT_MIR rustc.foo.ConstProp.diff
+// EMIT_MIR const_prop_miscompile.foo.ConstProp.diff
 fn foo() {
     let mut u = (1,);
     *&mut u.0 = 5;
     let y = { u.0 } == 5;
 }
 
-// EMIT_MIR rustc.bar.ConstProp.diff
+// EMIT_MIR const_prop_miscompile.bar.ConstProp.diff
 fn bar() {
     let mut v = (1,);
     unsafe {