Rustup #364

bjorn3 · 2018-03-17T17:58:53Z

Based on #361

that function has been removed

oli-obk · 2018-03-18T12:25:38Z

so now we're hitting some alignment issue in the initialization... I'll have to analyze this in detail

bjorn3 · 2018-03-18T18:17:13Z

miri/intrinsic.rs

                    let src = self.into_ptr(args[0].value)?;
+                    let src_align = self.layout_of(args[0].ty)?.align;


so now we're hitting some alignment issue in the initialization... I'll have to analyze this in detail

This takes the alignment of the pointer itself, instead of what it points to.

bjorn3 · 2018-03-18T18:26:36Z

#364 (comment) is the root cause of the alignment issue, temporarily worked around it. I am getting this error now:

error[E0080]: constant evaluation error
   --> /home/bjorn/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/thread/mod.rs:939:16
    |
939 |             if COUNTER == ::u64::MAX {
    |                ^^^^^^^^^^^^^^^^^^^^^ attempted to read undefined bytes
    |
note: inside call to `std::thread::ThreadId::new`
   --> /home/bjorn/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/thread/mod.rs:1008:21
    |
1008|                 id: ThreadId::new(),
    |                     ^^^^^^^^^^^^^^^
note: inside call to `std::thread::Thread::new`
   --> /home/bjorn/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/rt.rs:50:22
    |
50  |         let thread = Thread::new(Some("main".to_owned()));
    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: inside call to `std::rt::lang_start_internal`
   --> /home/bjorn/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/rt.rs:74:5
    |
74  |     lang_start_internal(&move || main().report(), argc, argv)
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

solson

I did a quick skim, though I didn't pay attention to which changes were yours or from the other PR.

solson · 2018-03-17T23:31:29Z

miri/fn_call.rs

+        let def_id = instance.def_id();
+        let item_path = self.tcx.absolute_item_path_str(def_id);
+        if item_path.starts_with("std::") {
+            println!("{}", item_path);


This stray debug println should be removed (or use the debug! logging macro).

solson · 2018-03-17T23:32:31Z

miri/fn_call.rs

+            println!("{}", item_path);
+        }
+        match &*item_path {
+            "std::sys::unix::thread::guard::init" | "std::sys::unix::thread::guard::current" => {


Can you add a more thorough explanation of what problem this solves?

solson · 2018-03-17T23:34:54Z

miri/fn_call.rs

+                match ret_ty.sty {
+                    ty::TyAdt(ref adt_def, _) => {
+                        assert!(adt_def.is_enum(), "Unexpected return type for {}", item_path);
+                        let none_variant_index = adt_def.variants.iter().enumerate().find(|&(_i, ref def)| {


You can use Iterator::position to simplify this, as in:

let none_variant_index = adt_def.variants.iter().position(|def| def.name.as_str() == "None").expect("No None variant");

solson · 2018-03-17T23:39:25Z

miri/intrinsic.rs

-                    Place::Ptr { .. } => {
-                        bug!("init intrinsic tried to write to fat or unaligned ptr target")
-                    }
+                    _ => bug!("TODO"),


Can you elaborate this TODO? What needs to be done here?

I don't know, it comes from #361

oli-obk · 2018-03-19T07:05:26Z

The current failure looks to me like we are not initializing static muts. There were a lot of changes in rustc around statics, I'll look into it.

bjorn3 · 2018-03-19T07:14:56Z

@oli-obk second last commit should fix it. I incorrectly returned true from mark_static_initialised

…uninitialized static error

oli-obk · 2018-03-19T07:36:49Z

The problem is that the const evaluation from rustc ends up creating an immutable allocation. You need to evaluate the static without calling tcx.const_eval. The relevant methods are in rustc_mir::interpret::const_eval and should be public.

Don't check interpret_interner when accessing a static to fix miri mutable statics Mutable statics don't work in my PR to fix the standalone [miri](https://github.com/solson/miri), as init_static didn't get called when the interpret_interner already contained a entry for the static, which is always immutable. cc rust-lang/miri#364

oli-obk · 2018-03-23T11:28:28Z

miri/lib.rs

+            .interpret_interner
+            .get_cached(cid.instance.def_id())
+            .expect("uncached static");
+        ecx.memory.copy(ptr, layout.align, to_ptr.into(), layout.align, layout.size.bytes(), true)?;


This won't work, because the memory might contain references into other statics. We also can't implement it as deep copies, because then we'd duplicate some other static's memory instead of referring to it.

Instead of calling ecx.const_eval do the code you had above, just without the interpret_interner accesses (instead to the machine caching as you do it here)

oli-obk · 2018-03-23T13:27:51Z

miri/lib.rs

@@ -287,6 +287,7 @@ impl<'mir, 'tcx: 'mir> Machine<'mir, 'tcx> for Evaluator<'tcx> {
            .interpret_interner
            .get_cached(cid.instance.def_id())
            .expect("uncached static");
+        // TODO: do a recursive copy


No, no recursive copy. if you have

static FOO: &'static Foo = &BAR; static BAR: Foo = Foo { field: &FOO };

Then BAR would end up referring to a copy of FOO instead of referring to it directly.

We can't evaluate the static in the same EvalContext as far as I know, so we have to copy it anyway. A cache could be used just like ecx.memory.data.mut_static to prevent duplication.

You can do it. Just push a stackframe for it as you had before 907e67f

But the while ecx.step()? {} will step out of the frame present at the beginning of the init_static function.

ah, you can solve that by recording the stack size before pushing the frame (self.frames().len()) in a variable and looping until you're back at the same frame.

oli-obk · 2018-03-31T10:29:44Z

Do you know where miri is failing atm? The travis logs are unhelpful due to an error reporting bug I need to fix in rustc

bjorn3 · 2018-03-31T12:02:13Z

With rust-lang/rust#49540 applied run-pass gives:

failures:

---- [ui] run-pass/issue-15523-big.rs stdout ----
	normalized stderr:
error[E0080]: constant evaluation error
  --> $DIR/issue-15523-big.rs:17:21
   |
17 | #[derive(PartialEq, PartialOrd)]
   |                     ^^^^^^^^^^ invalid enum discriminant value read
   |
note: inside call to `<Eu64 as std::cmp::PartialOrd>::partial_cmp`
  --> /home/bjorn/Documenten/rust2/src/libcore/cmp.rs:647:15
   |
647|         match self.partial_cmp(other) {
   |               ^^^^^^^^^^^^^^^^^^^^^^^
note: inside call to `<Eu64 as std::cmp::PartialOrd>::lt`
  --> $DIR/issue-15523-big.rs:37:13
   |
37 |     assert!(Eu64::Pos2 < Eu64::PosMax);
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^
note: inside call to `main`
  --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:74:34
   |
74 |     lang_start_internal(&move || main().report(), argc, argv)
   |                                  ^^^^^^
note: inside call to `closure`
  --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:59:75
   |
59 |             ::sys_common::backtrace::__rust_begin_short_backtrace(move || main())
   |                                                                           ^^^^^^
note: inside call to `closure`
  --> /home/bjorn/Documenten/rust2/src/libstd/sys_common/backtrace.rs:136:5
   |
136|     f()
   |     ^^^
note: inside call to `std::sys_common::backtrace::__rust_begin_short_backtrace::<[closure@DefId(1/1:1802 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]::{{closure}}[0]) 0:&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>`
  --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:59:13
   |
59 |             ::sys_common::backtrace::__rust_begin_short_backtrace(move || main())
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: inside call to `closure`
  --> /home/bjorn/Documenten/rust2/src/libstd/panicking.rs:306:40
   |
306|             ptr::write(&mut (*data).r, f());
   |                                        ^^^
note: inside call to `std::panicking::try::do_call::<[closure@DefId(1/1:1801 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>`
  --> /home/bjorn/Documenten/rust2/src/libstd/panicking.rs:302:5
   |
302| /     fn do_call<F: FnOnce() -> R, R>(data: *mut u8) {
303| |         unsafe {
304| |             let data = data as *mut Data<F, R>;
305| |             let f = ptr::read(&mut (*data).f);
306| |             ptr::write(&mut (*data).r, f());
307| |         }
308| |     }
   | |_____^
note: inside call to `std::panicking::try::<i32, [closure@DefId(1/1:1801 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe]>`
  --> /home/bjorn/Documenten/rust2/src/libstd/panic.rs:361:9
   |
361|         panicking::try(f)
   |         ^^^^^^^^^^^^^^^^^
note: inside call to `std::panic::catch_unwind::<[closure@DefId(1/1:1801 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>`
  --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:58:25
   |
58 |           let exit_code = panic::catch_unwind(|| {
   |  _________________________^
59 | |             ::sys_common::backtrace::__rust_begin_short_backtrace(move || main())
60 | |         });
   | |__________^
note: inside call to `std::rt::lang_start_internal`
  --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:74:5
   |
74 |     lang_start_internal(&move || main().report(), argc, argv)
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0080`.


expected stderr:


diff of stderr:

+error[E0080]: constant evaluation error
+  --> $DIR/issue-15523-big.rs:17:21
+   |
+17 | #[derive(PartialEq, PartialOrd)]
+   |                     ^^^^^^^^^^ invalid enum discriminant value read
+   |
+note: inside call to `<Eu64 as std::cmp::PartialOrd>::partial_cmp`
+  --> /home/bjorn/Documenten/rust2/src/libcore/cmp.rs:647:15
+   |
+647|         match self.partial_cmp(other) {
+   |               ^^^^^^^^^^^^^^^^^^^^^^^
+note: inside call to `<Eu64 as std::cmp::PartialOrd>::lt`
+  --> $DIR/issue-15523-big.rs:37:13
+   |
+37 |     assert!(Eu64::Pos2 < Eu64::PosMax);
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^
+note: inside call to `main`
+  --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:74:34
+   |
+74 |     lang_start_internal(&move || main().report(), argc, argv)
+   |                                  ^^^^^^
+note: inside call to `closure`
+  --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:59:75
+   |
+59 |             ::sys_common::backtrace::__rust_begin_short_backtrace(move || main())
+   |                                                                           ^^^^^^
+note: inside call to `closure`
+  --> /home/bjorn/Documenten/rust2/src/libstd/sys_common/backtrace.rs:136:5
+   |
+136|     f()
+   |     ^^^
+note: inside call to `std::sys_common::backtrace::__rust_begin_short_backtrace::<[closure@DefId(1/1:1802 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]::{{closure}}[0]) 0:&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>`
+  --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:59:13
+   |
+59 |             ::sys_common::backtrace::__rust_begin_short_backtrace(move || main())
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+note: inside call to `closure`
+  --> /home/bjorn/Documenten/rust2/src/libstd/panicking.rs:306:40
+   |
+306|             ptr::write(&mut (*data).r, f());
+   |                                        ^^^
+note: inside call to `std::panicking::try::do_call::<[closure@DefId(1/1:1801 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>`
+  --> /home/bjorn/Documenten/rust2/src/libstd/panicking.rs:302:5
+   |
+302| /     fn do_call<F: FnOnce() -> R, R>(data: *mut u8) {
+303| |         unsafe {
+304| |             let data = data as *mut Data<F, R>;
+305| |             let f = ptr::read(&mut (*data).f);
+306| |             ptr::write(&mut (*data).r, f());
+307| |         }
+308| |     }
+   | |_____^
+note: inside call to `std::panicking::try::<i32, [closure@DefId(1/1:1801 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe]>`
+  --> /home/bjorn/Documenten/rust2/src/libstd/panic.rs:361:9
+   |
+361|         panicking::try(f)
+   |         ^^^^^^^^^^^^^^^^^
+note: inside call to `std::panic::catch_unwind::<[closure@DefId(1/1:1801 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>`
+  --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:58:25
+   |
+58 |           let exit_code = panic::catch_unwind(|| {
+   |  _________________________^
+59 | |             ::sys_common::backtrace::__rust_begin_short_backtrace(move || main())
+60 | |         });
+   | |__________^
+note: inside call to `std::rt::lang_start_internal`
+  --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:74:5
+   |
+74 |     lang_start_internal(&move || main().report(), argc, argv)
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0080`.
+

The actual stderr differed from the expected stderr.
Actual stderr saved to /tmp/compiletest.H6HYTdQhAgsq/issue-15523-big.stderr
To update references, run this command from build directory:
tests/run-pass/update-references.sh '/tmp/compiletest.H6HYTdQhAgsq' 'issue-15523-big.rs'

error: 1 errors occurred comparing output.
status: exit code: 101
command: "target/debug/miri" "tests/run-pass/issue-15523-big.rs" "-L" "/tmp/compiletest.H6HYTdQhAgsq" "--target=x86_64-unknown-linux-gnu" "-C" "prefer-dynamic" "-o" "/tmp/compiletest.H6HYTdQhAgsq/issue-15523-big.stage-id" "-Zmir-opt-level=0" "-Zmir-emit-validate=1" "-L" "/tmp/compiletest.H6HYTdQhAgsq/issue-15523-big.stage-id.aux" "-A" "unused"
stdout:
------------------------------------------

------------------------------------------
stderr:
------------------------------------------
error[E0080]: constant evaluation error
  --> tests/run-pass/issue-15523-big.rs:17:21
   |
17 | #[derive(PartialEq, PartialOrd)]
   |                     ^^^^^^^^^^ invalid enum discriminant value read
   |
note: inside call to `<Eu64 as std::cmp::PartialOrd>::partial_cmp`
  --> /home/bjorn/Documenten/rust2/src/libcore/cmp.rs:647:15
   |
647|         match self.partial_cmp(other) {
   |               ^^^^^^^^^^^^^^^^^^^^^^^
note: inside call to `<Eu64 as std::cmp::PartialOrd>::lt`
  --> tests/run-pass/issue-15523-big.rs:37:13
   |
37 |     assert!(Eu64::Pos2 < Eu64::PosMax);
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^
note: inside call to `main`
  --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:74:34
   |
74 |     lang_start_internal(&move || main().report(), argc, argv)
   |                                  ^^^^^^
note: inside call to `closure`
  --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:59:75
   |
59 |             ::sys_common::backtrace::__rust_begin_short_backtrace(move || main())
   |                                                                           ^^^^^^
note: inside call to `closure`
  --> /home/bjorn/Documenten/rust2/src/libstd/sys_common/backtrace.rs:136:5
   |
136|     f()
   |     ^^^
note: inside call to `std::sys_common::backtrace::__rust_begin_short_backtrace::<[closure@DefId(1/1:1802 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]::{{closure}}[0]) 0:&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>`
  --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:59:13
   |
59 |             ::sys_common::backtrace::__rust_begin_short_backtrace(move || main())
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: inside call to `closure`
  --> /home/bjorn/Documenten/rust2/src/libstd/panicking.rs:306:40
   |
306|             ptr::write(&mut (*data).r, f());
   |                                        ^^^
note: inside call to `std::panicking::try::do_call::<[closure@DefId(1/1:1801 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>`
  --> /home/bjorn/Documenten/rust2/src/libstd/panicking.rs:302:5
   |
302| /     fn do_call<F: FnOnce() -> R, R>(data: *mut u8) {
303| |         unsafe {
304| |             let data = data as *mut Data<F, R>;
305| |             let f = ptr::read(&mut (*data).f);
306| |             ptr::write(&mut (*data).r, f());
307| |         }
308| |     }
   | |_____^
note: inside call to `std::panicking::try::<i32, [closure@DefId(1/1:1801 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe]>`
  --> /home/bjorn/Documenten/rust2/src/libstd/panic.rs:361:9
   |
361|         panicking::try(f)
   |         ^^^^^^^^^^^^^^^^^
note: inside call to `std::panic::catch_unwind::<[closure@DefId(1/1:1801 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>`
  --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:58:25
   |
58 |           let exit_code = panic::catch_unwind(|| {
   |  _________________________^
59 | |             ::sys_common::backtrace::__rust_begin_short_backtrace(move || main())
60 | |         });
   | |__________^
note: inside call to `std::rt::lang_start_internal`
  --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:74:5
   |
74 |     lang_start_internal(&move || main().report(), argc, argv)
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0080`.

------------------------------------------

thread '[ui] run-pass/issue-15523-big.rs' panicked at 'explicit panic', /home/bjorn/.cargo/registry/src/github.com-1ecc6299db9ec823/compiletest_rs-0.3.8/src/runtest.rs:2539:9
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
stack backtrace:
   0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
   1: std::sys_common::backtrace::print
   2: std::panicking::default_hook::{{closure}}
   3: std::panicking::default_hook
   4: std::panicking::rust_panic_with_hook
   5: std::panicking::begin_panic
             at /home/bjorn/Documenten/rust2/src/libstd/panicking.rs:365
   6: compiletest_rs::runtest::ProcRes::fatal
             at /home/bjorn/.cargo/registry/src/github.com-1ecc6299db9ec823/compiletest_rs-0.3.8/src/runtest.rs:2539
   7: compiletest_rs::runtest::TestCx::fatal_proc_rec
             at /home/bjorn/.cargo/registry/src/github.com-1ecc6299db9ec823/compiletest_rs-0.3.8/src/runtest.rs:1639
   8: compiletest_rs::runtest::TestCx::run_ui_test
             at /home/bjorn/.cargo/registry/src/github.com-1ecc6299db9ec823/compiletest_rs-0.3.8/src/runtest.rs:2238
   9: compiletest_rs::runtest::TestCx::run_revision
             at /home/bjorn/.cargo/registry/src/github.com-1ecc6299db9ec823/compiletest_rs-0.3.8/src/runtest.rs:140
  10: compiletest_rs::runtest::run
             at /home/bjorn/.cargo/registry/src/github.com-1ecc6299db9ec823/compiletest_rs-0.3.8/src/runtest.rs:80
  11: compiletest_rs::make_test_closure::{{closure}}
             at /home/bjorn/.cargo/registry/src/github.com-1ecc6299db9ec823/compiletest_rs-0.3.8/src/lib.rs:275
  12: <F as alloc::boxed::FnBox<A>>::call_box
             at /home/bjorn/Documenten/rust2/src/liballoc/boxed.rs:783
  13: <F as alloc::boxed::FnBox<A>>::call_box
  14: __rust_maybe_catch_panic

---- [ui] run-pass/zero-sized-binary-heap-push.rs stdout ----
	normalized stderr:
error[E0080]: constant evaluation error
   --> /home/bjorn/Documenten/rust2/src/libcore/ptr.rs:364:42
    |
364 |     intrinsics::move_val_init(&mut *dst, src)
    |                                          ^^^ a memory access tried to interpret some bytes as a pointer
    |
note: inside call to `std::ptr::write::<()>`
   --> /home/bjorn/Documenten/rust2/src/liballoc/vec.rs:1063:13
    |
1063|             ptr::write(end, value);
    |             ^^^^^^^^^^^^^^^^^^^^^^
note: inside call to `<std::vec::Vec<T>><()>::push`
   --> /home/bjorn/Documenten/rust2/src/liballoc/binary_heap.rs:582:9
    |
582 |         self.data.push(item);
    |         ^^^^^^^^^^^^^^^^^^^^
note: inside call to `<std::collections::BinaryHeap<T>><()>::push`
   --> $DIR/zero-sized-binary-heap-push.rs:22:13
    |
22  |             tester.push(());
    |             ^^^^^^^^^^^^^^^
note: inside call to `main`
   --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:74:34
    |
74  |     lang_start_internal(&move || main().report(), argc, argv)
    |                                  ^^^^^^
note: inside call to `closure`
   --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:59:75
    |
59  |             ::sys_common::backtrace::__rust_begin_short_backtrace(move || main())
    |                                                                           ^^^^^^
note: inside call to `closure`
   --> /home/bjorn/Documenten/rust2/src/libstd/sys_common/backtrace.rs:136:5
    |
136 |     f()
    |     ^^^
note: inside call to `std::sys_common::backtrace::__rust_begin_short_backtrace::<[closure@DefId(1/1:1802 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]::{{closure}}[0]) 0:&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>`
   --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:59:13
    |
59  |             ::sys_common::backtrace::__rust_begin_short_backtrace(move || main())
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: inside call to `closure`
   --> /home/bjorn/Documenten/rust2/src/libstd/panicking.rs:306:40
    |
306 |             ptr::write(&mut (*data).r, f());
    |                                        ^^^
note: inside call to `std::panicking::try::do_call::<[closure@DefId(1/1:1801 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>`
   --> /home/bjorn/Documenten/rust2/src/libstd/panicking.rs:302:5
    |
302 | /     fn do_call<F: FnOnce() -> R, R>(data: *mut u8) {
303 | |         unsafe {
304 | |             let data = data as *mut Data<F, R>;
305 | |             let f = ptr::read(&mut (*data).f);
306 | |             ptr::write(&mut (*data).r, f());
307 | |         }
308 | |     }
    | |_____^
note: inside call to `std::panicking::try::<i32, [closure@DefId(1/1:1801 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe]>`
   --> /home/bjorn/Documenten/rust2/src/libstd/panic.rs:361:9
    |
361 |         panicking::try(f)
    |         ^^^^^^^^^^^^^^^^^
note: inside call to `std::panic::catch_unwind::<[closure@DefId(1/1:1801 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>`
   --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:58:25
    |
58  |           let exit_code = panic::catch_unwind(|| {
    |  _________________________^
59  | |             ::sys_common::backtrace::__rust_begin_short_backtrace(move || main())
60  | |         });
    | |__________^
note: inside call to `std::rt::lang_start_internal`
   --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:74:5
    |
74  |     lang_start_internal(&move || main().report(), argc, argv)
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0080`.


expected stderr:


diff of stderr:

+error[E0080]: constant evaluation error
+   --> /home/bjorn/Documenten/rust2/src/libcore/ptr.rs:364:42
+    |
+364 |     intrinsics::move_val_init(&mut *dst, src)
+    |                                          ^^^ a memory access tried to interpret some bytes as a pointer
+    |
+note: inside call to `std::ptr::write::<()>`
+   --> /home/bjorn/Documenten/rust2/src/liballoc/vec.rs:1063:13
+    |
+1063|             ptr::write(end, value);
+    |             ^^^^^^^^^^^^^^^^^^^^^^
+note: inside call to `<std::vec::Vec<T>><()>::push`
+   --> /home/bjorn/Documenten/rust2/src/liballoc/binary_heap.rs:582:9
+    |
+582 |         self.data.push(item);
+    |         ^^^^^^^^^^^^^^^^^^^^
+note: inside call to `<std::collections::BinaryHeap<T>><()>::push`
+   --> $DIR/zero-sized-binary-heap-push.rs:22:13
+    |
+22  |             tester.push(());
+    |             ^^^^^^^^^^^^^^^
+note: inside call to `main`
+   --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:74:34
+    |
+74  |     lang_start_internal(&move || main().report(), argc, argv)
+    |                                  ^^^^^^
+note: inside call to `closure`
+   --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:59:75
+    |
+59  |             ::sys_common::backtrace::__rust_begin_short_backtrace(move || main())
+    |                                                                           ^^^^^^
+note: inside call to `closure`
+   --> /home/bjorn/Documenten/rust2/src/libstd/sys_common/backtrace.rs:136:5
+    |
+136 |     f()
+    |     ^^^
+note: inside call to `std::sys_common::backtrace::__rust_begin_short_backtrace::<[closure@DefId(1/1:1802 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]::{{closure}}[0]) 0:&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>`
+   --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:59:13
+    |
+59  |             ::sys_common::backtrace::__rust_begin_short_backtrace(move || main())
+    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+note: inside call to `closure`
+   --> /home/bjorn/Documenten/rust2/src/libstd/panicking.rs:306:40
+    |
+306 |             ptr::write(&mut (*data).r, f());
+    |                                        ^^^
+note: inside call to `std::panicking::try::do_call::<[closure@DefId(1/1:1801 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>`
+   --> /home/bjorn/Documenten/rust2/src/libstd/panicking.rs:302:5
+    |
+302 | /     fn do_call<F: FnOnce() -> R, R>(data: *mut u8) {
+303 | |         unsafe {
+304 | |             let data = data as *mut Data<F, R>;
+305 | |             let f = ptr::read(&mut (*data).f);
+306 | |             ptr::write(&mut (*data).r, f());
+307 | |         }
+308 | |     }
+    | |_____^
+note: inside call to `std::panicking::try::<i32, [closure@DefId(1/1:1801 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe]>`
+   --> /home/bjorn/Documenten/rust2/src/libstd/panic.rs:361:9
+    |
+361 |         panicking::try(f)
+    |         ^^^^^^^^^^^^^^^^^
+note: inside call to `std::panic::catch_unwind::<[closure@DefId(1/1:1801 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>`
+   --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:58:25
+    |
+58  |           let exit_code = panic::catch_unwind(|| {
+    |  _________________________^
+59  | |             ::sys_common::backtrace::__rust_begin_short_backtrace(move || main())
+60  | |         });
+    | |__________^
+note: inside call to `std::rt::lang_start_internal`
+   --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:74:5
+    |
+74  |     lang_start_internal(&move || main().report(), argc, argv)
+    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0080`.
+

The actual stderr differed from the expected stderr.
Actual stderr saved to /tmp/compiletest.H6HYTdQhAgsq/zero-sized-binary-heap-push.stderr
To update references, run this command from build directory:
tests/run-pass/update-references.sh '/tmp/compiletest.H6HYTdQhAgsq' 'zero-sized-binary-heap-push.rs'

error: 1 errors occurred comparing output.
status: exit code: 101
command: "target/debug/miri" "tests/run-pass/zero-sized-binary-heap-push.rs" "-L" "/tmp/compiletest.H6HYTdQhAgsq" "--target=x86_64-unknown-linux-gnu" "-C" "prefer-dynamic" "-o" "/tmp/compiletest.H6HYTdQhAgsq/zero-sized-binary-heap-push.stage-id" "-Zmir-opt-level=0" "-Zmir-emit-validate=1" "-L" "/tmp/compiletest.H6HYTdQhAgsq/zero-sized-binary-heap-push.stage-id.aux" "-A" "unused"
stdout:
------------------------------------------

------------------------------------------
stderr:
------------------------------------------
error[E0080]: constant evaluation error
   --> /home/bjorn/Documenten/rust2/src/libcore/ptr.rs:364:42
    |
364 |     intrinsics::move_val_init(&mut *dst, src)
    |                                          ^^^ a memory access tried to interpret some bytes as a pointer
    |
note: inside call to `std::ptr::write::<()>`
   --> /home/bjorn/Documenten/rust2/src/liballoc/vec.rs:1063:13
    |
1063|             ptr::write(end, value);
    |             ^^^^^^^^^^^^^^^^^^^^^^
note: inside call to `<std::vec::Vec<T>><()>::push`
   --> /home/bjorn/Documenten/rust2/src/liballoc/binary_heap.rs:582:9
    |
582 |         self.data.push(item);
    |         ^^^^^^^^^^^^^^^^^^^^
note: inside call to `<std::collections::BinaryHeap<T>><()>::push`
   --> tests/run-pass/zero-sized-binary-heap-push.rs:22:13
    |
22  |             tester.push(());
    |             ^^^^^^^^^^^^^^^
note: inside call to `main`
   --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:74:34
    |
74  |     lang_start_internal(&move || main().report(), argc, argv)
    |                                  ^^^^^^
note: inside call to `closure`
   --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:59:75
    |
59  |             ::sys_common::backtrace::__rust_begin_short_backtrace(move || main())
    |                                                                           ^^^^^^
note: inside call to `closure`
   --> /home/bjorn/Documenten/rust2/src/libstd/sys_common/backtrace.rs:136:5
    |
136 |     f()
    |     ^^^
note: inside call to `std::sys_common::backtrace::__rust_begin_short_backtrace::<[closure@DefId(1/1:1802 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]::{{closure}}[0]) 0:&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>`
   --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:59:13
    |
59  |             ::sys_common::backtrace::__rust_begin_short_backtrace(move || main())
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: inside call to `closure`
   --> /home/bjorn/Documenten/rust2/src/libstd/panicking.rs:306:40
    |
306 |             ptr::write(&mut (*data).r, f());
    |                                        ^^^
note: inside call to `std::panicking::try::do_call::<[closure@DefId(1/1:1801 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>`
   --> /home/bjorn/Documenten/rust2/src/libstd/panicking.rs:302:5
    |
302 | /     fn do_call<F: FnOnce() -> R, R>(data: *mut u8) {
303 | |         unsafe {
304 | |             let data = data as *mut Data<F, R>;
305 | |             let f = ptr::read(&mut (*data).f);
306 | |             ptr::write(&mut (*data).r, f());
307 | |         }
308 | |     }
    | |_____^
note: inside call to `std::panicking::try::<i32, [closure@DefId(1/1:1801 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe]>`
   --> /home/bjorn/Documenten/rust2/src/libstd/panic.rs:361:9
    |
361 |         panicking::try(f)
    |         ^^^^^^^^^^^^^^^^^
note: inside call to `std::panic::catch_unwind::<[closure@DefId(1/1:1801 ~ std[a0b6]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>`
   --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:58:25
    |
58  |           let exit_code = panic::catch_unwind(|| {
    |  _________________________^
59  | |             ::sys_common::backtrace::__rust_begin_short_backtrace(move || main())
60  | |         });
    | |__________^
note: inside call to `std::rt::lang_start_internal`
   --> /home/bjorn/Documenten/rust2/src/libstd/rt.rs:74:5
    |
74  |     lang_start_internal(&move || main().report(), argc, argv)
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0080`.

------------------------------------------

thread '[ui] run-pass/zero-sized-binary-heap-push.rs' panicked at 'explicit panic', /home/bjorn/.cargo/registry/src/github.com-1ecc6299db9ec823/compiletest_rs-0.3.8/src/runtest.rs:2539:9
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
stack backtrace:
   0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
   1: std::sys_common::backtrace::print
   2: std::panicking::default_hook::{{closure}}
   3: std::panicking::default_hook
   4: std::panicking::rust_panic_with_hook
   5: std::panicking::begin_panic
             at /home/bjorn/Documenten/rust2/src/libstd/panicking.rs:365
   6: compiletest_rs::runtest::ProcRes::fatal
             at /home/bjorn/.cargo/registry/src/github.com-1ecc6299db9ec823/compiletest_rs-0.3.8/src/runtest.rs:2539
   7: compiletest_rs::runtest::TestCx::fatal_proc_rec
             at /home/bjorn/.cargo/registry/src/github.com-1ecc6299db9ec823/compiletest_rs-0.3.8/src/runtest.rs:1639
   8: compiletest_rs::runtest::TestCx::run_ui_test
             at /home/bjorn/.cargo/registry/src/github.com-1ecc6299db9ec823/compiletest_rs-0.3.8/src/runtest.rs:2238
   9: compiletest_rs::runtest::TestCx::run_revision
             at /home/bjorn/.cargo/registry/src/github.com-1ecc6299db9ec823/compiletest_rs-0.3.8/src/runtest.rs:140
  10: compiletest_rs::runtest::run
             at /home/bjorn/.cargo/registry/src/github.com-1ecc6299db9ec823/compiletest_rs-0.3.8/src/runtest.rs:80
  11: compiletest_rs::make_test_closure::{{closure}}
             at /home/bjorn/.cargo/registry/src/github.com-1ecc6299db9ec823/compiletest_rs-0.3.8/src/lib.rs:275
  12: <F as alloc::boxed::FnBox<A>>::call_box
             at /home/bjorn/Documenten/rust2/src/liballoc/boxed.rs:783
  13: <F as alloc::boxed::FnBox<A>>::call_box
  14: __rust_maybe_catch_panic


failures:
    [ui] run-pass/issue-15523-big.rs
    [ui] run-pass/zero-sized-binary-heap-push.rs

test result: FAILED. 127 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out

Compile-fail tests all fail, because of changed error format.

Edit: updated for last commit (only two tests failing, one invalid discriminant for enum with niche filling (Option<cmp::Ordering>) and one with a zst)

bjorn3 · 2018-04-04T13:55:26Z

miri/lib.rs

+                                // ------------------------------------------------------------
+                                // ||||||||||||| TODO: remove this horrible hack ||||||||||||||
+                                // ------------------------------------------------------------
+                                unsafe { &mut *(frame as *const Frame as *mut Frame) }.storage_dead(local);


TODO: remove this!

Eh, this is an & to &mut cast, right? This is UB. You might as well deref a dangling pointer here.

I know, that is why I want to remove it.

oli-obk · 2018-04-05T06:56:30Z

miri/lib.rs

+        let call_stackframe = ecx.stack().len();
+        while ecx.step()? && ecx.stack().len() >= call_stackframe {
+            if ecx.stack().len() == call_stackframe {
+                let frame = ecx.stack().last().unwrap();


is frame_mut still public? if so, you can use that, otherwise, make it public in rustc

bjorn3 · 2018-04-07T09:31:01Z

miri/validation.rs

@@ -558,6 +560,7 @@ impl<'a, 'tcx> EvalContextExt<'tcx> for EvalContext<'a, 'tcx, super::Evaluator<'
            TyAdt(adt, _) if adt.is_box() => true,
            TySlice(_) | TyAdt(_, _) | TyTuple(..) | TyClosure(..) | TyArray(..) |
            TyDynamic(..) | TyGenerator(..) | TyForeign(_) => false,
+            TyGeneratorWitness(..) => bug!("I'm not sure what to return here"),


What should I return here?

I don't think this is reachable, so just throw an unreachable!() invocation there for now

Sounds reasonable.

bjorn3 · 2018-04-07T09:34:21Z

A list of upstream TODO's:

make EvalContext::write_discriminant_value public (#49758)

oli-obk · 2018-04-13T14:11:18Z

@bjorn3 thank's for your awesome work! I have rebased and sqashed some commits into the rustup branch on this repo and opened rust-lang/rust#49933 to apply the necessary fixes to the compiler

oli-obk and others added 13 commits December 15, 2017 10:14

Update to some cleanups in rustc

2671cf3

stop using Instance::def_ty

a23e587

that function has been removed

Merge branch 'master' into def_ty

5147655

update compiletest dependency

30496f5

pass typecheck

03aa876

update log deps

cabdc55

update for rust/47205

33af320

partially deal with rust/46479

d289c0f

Rustup

9e04368

rustup

3e339bc

Rustup

9be04c0

Add stack guard shim

a204cb4

Get the tests one step further

aa5972d

bjorn3 commented Mar 18, 2018

View reviewed changes

WIP fix alignment issue

1e094e5

solson reviewed Mar 18, 2018

View reviewed changes

bjorn3 added 2 commits March 19, 2018 08:09

Dont claim to have marked static initialized

3038274

Use elem align as src align in copy intrinsic

bad9fa5

Hack: copy init_static from rustc CompileTimeEvaluator to try to fix …

5db2aba

…uninitialized static error

Maybe prevent marking statics as immutable

896996b

bjorn3 mentioned this pull request Mar 20, 2018

Don't check interpret_interner when accessing a static to fix miri mutable statics rust-lang/rust#49216

Merged

Fix init_static

907e67f

bjorn3 added 3 commits March 23, 2018 12:08

travis: cache build dir

5831309

Fix it

a86348b

Fix (try 2)

57e63b8

oli-obk reviewed Mar 23, 2018

View reviewed changes

FIx (try 3)

654cd94

oli-obk reviewed Mar 23, 2018

View reviewed changes

bjorn3 added 2 commits March 23, 2018 14:37

Fix (try 4)

6e60b79

Partially fix it

3656c03

solson mentioned this pull request Mar 26, 2018

Remove conservative_impl_trait feature #365

Closed

Rustup

2137351

Fix some more tests with some unsafe code

5b8781c

bjorn3 commented Apr 4, 2018

View reviewed changes

oli-obk reviewed Apr 5, 2018

View reviewed changes

Remove unsafe code

054b0db

bjorn3 commented Apr 7, 2018

View reviewed changes

bjorn3 added 2 commits April 7, 2018 11:43

Some cleanups

77413d7

Update Cargo.lock and some improvements

2e1b165

bjorn3 force-pushed the rustup branch from 9b18153 to 2e1b165 Compare April 7, 2018 12:37

bjorn3 mentioned this pull request Apr 8, 2018

miri: invalid enum discriminant value read rust-lang/rust#49777

Closed

oli-obk closed this Apr 13, 2018

bjorn3 deleted the rustup branch April 14, 2018 10:58

bjorn3 restored the rustup branch April 15, 2018 08:39

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		let src = self.into_ptr(args[0].value)?;
		let src_align = self.layout_of(args[0].ty)?.align;

Rustup #364

Rustup #364

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