Prohibit `global_allocator` in submodules #51335

mark-i-m · 2018-06-04T01:13:42Z

Background: #44113 is caused by weird interactions with hygiene. Hygiene is hard. After a lot of playing around, we decided that the best path forward would be to prohibit global_allocators from being in submodules for now. When somebody gets it working, we can re-enable it.

This PR contains the following

Some hygiene "fixes" -- things I suspect are the correct thing to do that will make life easier in the future. This includes using call_site hygiene for the generated module and passing the correct crate name to the expansion config.
Comments and minor formatting fixes
Some debugging code
Code to prohibit global_allocator in submodules
Test checking that the proper error occurs.

cc #44113 #49320 #51241

r? @alexcrichton

rust-highfive · 2018-06-04T02:09:31Z

The job x86_64-gnu-llvm-3.9 of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

[00:43:10] ............................................................................i.......................
[00:43:14] ....................................................................................................
[00:43:20] ....................................................................................................
[00:43:26] ....................................................................................................
[00:43:30] .........i.................iiiiiiiii...................................................
[00:43:30] 
[00:43:30] travis_fold:start:test_ui_nll
travis_time:start:test_ui_nll
Check compiletest suite=ui mode=ui compare_mode=nll (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
---
[00:44:20] ............................................................................i.......................
[00:44:25] ....................................................................................................
[00:44:29] ....................................................................................................
[00:44:35] ....................................................................................................
[00:44:39] .........i..................iiiiiiiii..................................................
[00:44:39] 
[00:44:39]  finished in 68.810
[00:44:39] travis_fold:end:test_ui_nll

---
[00:47:28] ....................................................................................................
[00:47:39] ....................................................................................................
[00:47:50] ....................................................................................................
[00:48:12] ...........................................................i........................................
[00:48:24] ..........................................................................................F..i......
[00:48:52] ..............................................................................test [run-pass] run-pass/issue-29227.rs has been running for over 60 seconds
[00:48:58] ......................
[00:49:23] ....................................................................................................
[00:49:35] ....................................................................................................
---
[00:52:15] ................................................iiiiiii.............................................
[00:52:34] ....................................................................................................
[00:52:49] ....................................................................................................
[00:53:09] ....................................................................................................
" "/usr/bin/python2.7" "--lldb-python" "/usr/bin/python2.7" "--gdb" "/usr/bin/gdb" "--quiet" "--llvm-version" "3.9.1\n" "--system-llvm" "--cc" "" "--cxx" "" "--cflags" "" "--llvm-components" "" "--llvm-cxxflags" "" "--adb-path" "adb" "--adb-test-dir" "/data/tmp/work" "--android-cross-path" "" "--color" "always"
[00:53:30] 
[00:53:30] 
[00:53:30] failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test
[00:53:30] Build completed unsuccessfully in 0:12:32
[00:53:30] Build completed unsuccessfully in 0:12:32
[00:53:30] Makefile:58: recipe for target 'check' failed
[00:53:30] make: *** [check] Error 1

The command "stamp sh -x -c "$RUN_SCRIPT"" exited with 2.
travis_time:start:06e4cb7a
$ date && (curl -fs --head https://google.com | grep ^Date: | sed 's/Date: //g' || true)

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

rust-highfive · 2018-06-06T00:57:07Z

The job x86_64-gnu-llvm-3.9 of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

/usr/local/lib/python2.7/dist-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:122: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
/usr/local/lib/python2.7/dist-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:122: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
  Downloading https://files.pythonhosted.org/packages/5f/86/363f1249d0b62d7cce3cb8973fb6715b57ca75f8425d6c45fe5e129531a9/awscli-1.15.33-py2.py3-none-any.whl (1.3MB)
    0% |▎                               | 10kB 3.7MB/s eta 0:00:01
    1% |▌                               | 20kB 1.6MB/s eta 0:00:01
    2% |▉                               | 30kB 1.8MB/s eta 0:00:01
    3% |█                               | 40kB 1.8MB/s eta 0:00:01
---
[00:13:17]    Compiling rustc_mir v0.0.0 (file:///checkout/src/librustc_mir)
[00:13:17]    Compiling rustc_typeck v0.0.0 (file:///checkout/src/librustc_typeck)
[00:16:10]    Compiling rustc_resolve v0.0.0 (file:///checkout/src/librustc_resolve)
[00:16:11]    Compiling rustc_allocator v0.0.0 (file:///checkout/src/librustc_allocator)
[00:16:12] error[E0412]: cannot find type `Mac` in this scope
[00:16:12]    --> librustc_allocator/expand.rs:171:33
[00:16:12]     |
[00:16:12] 171 |     fn fold_mac(&mut self, mac: Mac) -> Mac {
[00:16:12]     |                                 ^^^ not found in this scope
[00:16:12] help: possible candidate is found in another module, you can import it into scope
[00:16:12] 11  | use syntax::ast::Mac;
[00:16:12]     |
[00:16:12] 
[00:16:12] 
[00:16:12] error[E0412]: cannot find type `Mac` in this scope
[00:16:12]    --> librustc_allocator/expand.rs:171:41
[00:16:12]     |
[00:16:12] 171 |     fn fold_mac(&mut self, mac: Mac) -> Mac {
[00:16:12]     |                                         ^^^ not found in this scope
[00:16:12] help: possible candidate is found in another module, you can import it into scope
[00:16:12] 11  | use syntax::ast::Mac;
[00:16:12]     |
[00:16:12] 
[00:16:12] error: aborting due to 2 previous errors
[00:16:12] error: aborting due to 2 previous errors
[00:16:12] 
[00:16:12] For more information about this error, try `rustc --explain E0412`.
[00:16:12] error: Could not compile `rustc_allocator`.
[00:16:12] 
[00:16:12] Caused by:
[00:16:12]   process didn't exit successfully: `/checkout/obj/build/bootstrap/debug/rustc --crate-name rustc_allocator librustc_allocator/lib.rs --color always --error-format json --crate-type dylib --emit=dep-info,link -C prefer-dynamic -C opt-level=2 -C metadata=74cdf675d98e099e -C extra-filename=-74cdf675d98e099e --out-dir /checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps --target x86_64-unknown-linux-gnu -L dependency=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps -L dependency=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/release/deps --extern syntax=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/libsyntax-4c5434c80172b18c.so --extern log=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/liblog-5073f1296cd24b67.rlib --extern syntax_pos=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/libsyntax_pos-0404335fb4ae3dc1.so --extern rustc_target=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_target-58741ed9de9aae4f.so --extern rustc_errors=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_errors-41b116eaee1e5535.so --extern rustc=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc-a30c37d59a6fc275.so -L native=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/build/backtrace-sys-88673787176f9d86/out -L native=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/build/miniz-sys-62d80197b9ec531e/out` (exit code: 101)
[00:17:34] error: build failed
[00:17:34] error: build failed
[00:17:34] command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "build" "--target" "x86_64-unknown-linux-gnu" "-j" "4" "--release" "--locked" "--color" "always" "--features" " jemalloc" "--manifest-path" "/checkout/src/rustc/Cargo.toml" "--message-format" "json"
[00:17:34] expected success, got: exit code: 101
[00:17:34] thread 'main' panicked at 'cargo must succeed', bootstrap/compile.rs:1091:9
[00:17:34] travis_fold:end:stage0-rustc

[00:17:34] travis_time:end:stage0-rustc:start=1528245101186962730,finish=1528245857939140127,duration=756752177397


[00:17:34] failed to run: /checkout/obj/build/bootstrap/debug/bootstrap build
[00:17:34] Build completed unsuccessfully in 0:12:48
[00:17:34] make: *** [all] Error 1
[00:17:34] Makefile:28: recipe for target 'all' failed

The command "stamp sh -x -c "$RUN_SCRIPT"" exited with 2.
travis_time:start:3585ef20
$ date && (curl -fs --head https://google.com | grep ^Date: | sed 's/Date: //g' || true)

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

pietroalbini · 2018-06-18T09:14:12Z

The reviewer is currently away. Maybe someone else from @rust-lang/compiler can review this?

oli-obk · 2018-06-18T09:29:32Z

@bors r+

bors · 2018-06-18T09:29:33Z

📌 Commit 461d3e0 has been approved by oli-obk

bors · 2018-06-18T09:29:40Z

🔒 Merge conflict

pietroalbini · 2018-06-18T12:30:19Z

@mark-i-m you need to rebase on top of the latest master.

mark-i-m · 2018-06-19T00:17:01Z

Rebased

rust-highfive · 2018-06-19T01:01:21Z

The job x86_64-gnu-llvm-3.9 of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

travis_time:start:test_ui
Check compiletest suite=ui mode=ui (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
[00:42:42] 
[00:42:42] running 1504 tests
[00:42:46] ........F....................................................................................i......
[00:42:56] ....................................................................................................
[00:42:59] ....................................................................................................
[00:43:03] ....................................................................................................
[00:43:06] ....................................................................................................
---
[00:43:36] ....................................................................................................
[00:43:42] ....................................................................................................
[00:43:47] ....................................................................................................
[00:43:53] ...................i................................................................................
inux-gnu/test/ui/allocator-submodule/a" "-Crpath" "-O" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/allocator-submodule/auxiliary" "-A" "unused"
[00:43:54] ------------------------------------------
[00:43:54] 
[00:43:54] ------------------------------------------
[00:43:54] stderr:
[00:43:54] stderr:
[00:43:54] ------------------------------------------
[00:43:54] {"message":"`global_allocator` cannot be used in submodules","code":null,"level":"error","spans":[{"file_name":"/checkout/src/test/ui/allocator-submodule.rs","byte_start":989,"byte_end":1023,"line_start":34,"line_end":34,"column_start":5,"column_end":39,"is_primary":true,"text":[{"text":"    static MY_HEAP: MyAlloc = MyAlloc; //~ ERROR global_allocator","highlight_start":5,"highlight_end":39}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[],"rendered":"error: `global_allocator` cannot be used in submodules\n  --> /checkout/src/test/ui/allocator-submodule.rs:34:5\n   |\nLL |     static MY_HEAP: MyAlloc = MyAlloc; //~ ERROR global_allocator\n   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\n"}
[00:43:54] {"message":"unresolved import `std::alloc::Opaque`","code":{"code":"E0432","explanation":"\nAn import was unresolved.\n\nErroneous code example:\n\n```compile_fail,E0432\nuse something::Foo; // error: unresolved import `something::Foo`.\n```\n\nPaths in `use` statements are relative to the crate root. To import items\nrelative to the current and parent modules, use the `self::` and `super::e            768M     0  768M   0% /var/ramfs
31740 ./.git/modules/src/libcompiler_builtins/modules/compiler-rt/objects/pack
31668 ./obj/build/x86_64-unknown-linux-gnu/doc/src
31532 ./src/libcompiler_builtins/compiler-rt/test
27892 ./.git/modules/src/tools/lld
---
travis_time:end:201449f4:start=1529370078953385609,finish=1529370078960082113,duration=6696504
travis_fold:end:after_failure.3
travis_fold:start:after_failure.4
travis_time:start:199f0db2
$ head -30 ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers || true
head: cannot open ‘./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers’ for reading: No such file or directory
travis_fold:end:after_failure.4
travis_fold:start:after_failure.5
travis_time:start:05c06df6
$ dmesg | grep -i kill

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

rust-highfive · 2018-06-19T02:57:50Z

The job x86_64-gnu-llvm-3.9 of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

travis_time:start:test_ui
Check compiletest suite=ui mode=ui (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
[00:42:59] 
[00:42:59] running 1504 tests
[00:43:03] ........F....................................................................................i......
[00:43:13] ....................................................................................................
[00:43:16] ....................................................................................................
[00:43:20] ....................................................................................................
[00:43:23] ....................................................................................................
---
[00:44:12] ...................i................................................................................
re.3
travis_fold:start:after_failure.4
travis_time:start:35547f60
$ head -30 ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers || true
head: cannot open ‘./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers’ for reading: No such file or directory
travis_fold:end:after_failure.4
travis_fold:start:after_failure.5
travis_time:start:269c87b5
$ dmesg | grep -i kill

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

eddyb · 2018-06-22T03:23:51Z

src/librustc_allocator/expand.rs

+        self.in_submod += 1;
+        let ret = fold::noop_fold_mod(m, self);
+        self.in_submod -= 1;
+        info!("exit submodule");


I don't think info!-level debug logging should be kept in. You can use debug!, if you want.

mark-i-m · 2018-06-23T02:45:19Z

r? @oli-obk Time for another review?

oli-obk · 2018-06-23T08:19:40Z

@bors r+

bors · 2018-06-23T08:19:41Z

📌 Commit d264e25b730e598562da471723c8b7647c810a4e has been approved by oli-obk

mark-i-m · 2018-06-24T01:12:40Z

??? I just rebased this?

bors · 2018-06-24T03:08:39Z

☔ The latest upstream changes (presumably #51726) made this pull request unmergeable. Please resolve the merge conflicts.

- we need to figure out hygiene first - change the test to check that the prohibition works with a good error msg - leaves some comments and debugging code - leaves some of our supposed fixes

mark-i-m · 2018-06-24T21:21:22Z

Rebased again

oli-obk · 2018-06-25T08:36:30Z

@bors r+

bors · 2018-06-25T08:36:30Z

📌 Commit 16d7f87 has been approved by oli-obk

pietroalbini · 2018-06-25T08:39:19Z

Let's avoid rebasing this again.

@bors p=1

bors · 2018-06-25T08:54:23Z

⌛ Testing commit 16d7f87 with merge 446aef6...

@alexcrichton

Prohibit `global_allocator` in submodules Background: #44113 is caused by weird interactions with hygiene. Hygiene is hard. After a lot of playing around, we decided that the best path forward would be to prohibit `global_allocator`s from being in submodules for now. When somebody gets it working, we can re-enable it. This PR contains the following - Some hygiene "fixes" -- things I suspect are the correct thing to do that will make life easier in the future. This includes using call_site hygiene for the generated module and passing the correct crate name to the expansion config. - Comments and minor formatting fixes - Some debugging code - Code to prohibit `global_allocator` in submodules - Test checking that the proper error occurs. cc #44113 #49320 #51241 r? @alexcrichton

bors · 2018-06-25T11:00:48Z

☀️ Test successful - status-appveyor, status-travis
Approved by: oli-obk
Pushing 446aef6 to master...

pietroalbini · 2018-06-27T21:45:21Z

Reason for the beta nomination: global allocators will be stabilized in 1.28, and it's best to prohibit something before it reaches stable.

mark-i-m · 2018-06-28T00:02:06Z

@pietroalbini is there something I need to do on my end?

pietroalbini · 2018-06-28T08:41:59Z

@mark-i-m no, the compiler team has a meeting later today when they'll decide if this can be backported.

@ghost

[beta] Rollup backports Merged and approved: * #51725: Do not build LLVM tools for any of the tools * #51852: Don't use `ParamEnv::reveal_all()` if there is a real one available * #51686: yet another "old borrowck" bug around match default bindings * #51868: Remove process::id from 'Stabilized APIs' in 1.27.0 release notes * #51335: Prohibit `global_allocator` in submodules r? @ghost

rust-highfive assigned alexcrichton Jun 4, 2018

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jun 4, 2018

mark-i-m mentioned this pull request Jun 4, 2018

Stabilize GlobalAlloc and #[global_allocator] #51241

Merged

mark-i-m mentioned this pull request Jun 6, 2018

Make ./x.py errors more machine-grep-able #51385

Closed

mark-i-m force-pushed the allocator branch from 08be7e8 to 461d3e0 Compare June 6, 2018 02:11

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jun 18, 2018

bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Jun 18, 2018

mark-i-m force-pushed the allocator branch from 461d3e0 to 558be1e Compare June 19, 2018 00:16

eddyb reviewed Jun 22, 2018

View reviewed changes

rust-highfive assigned oli-obk and unassigned alexcrichton Jun 23, 2018

pietroalbini added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jun 23, 2018

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jun 23, 2018

bors added the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label Jun 24, 2018

mark-i-m added 6 commits June 24, 2018 16:10

Attempt to fix hygiene for global_allocator

5da4ff8

Prohibit global_allocator in submodules for now

792772a

- we need to figure out hygiene first - change the test to check that the prohibition works with a good error msg - leaves some comments and debugging code - leaves some of our supposed fixes

enable fold_mac

08479aa

fix test

e353402

actually fix test

997655c

used debug, not info

16d7f87

mark-i-m force-pushed the allocator branch from e869c42 to 16d7f87 Compare June 24, 2018 21:16

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jun 25, 2018

bors merged commit 16d7f87 into rust-lang:master Jun 25, 2018

pietroalbini added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Jun 25, 2018

Mark-Simulacrum added the I-nominated label Jun 27, 2018

nikomatsakis added the beta-accepted Accepted for backporting to the compiler in the beta channel. label Jun 28, 2018

pietroalbini mentioned this pull request Jun 28, 2018

[beta] Rollup backports #51857

Merged

pietroalbini removed the beta-nominated Nominated for backporting to the compiler in the beta channel. label Jun 28, 2018

mark-i-m deleted the allocator branch November 14, 2018 16:40

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Prohibit `global_allocator` in submodules #51335

Prohibit `global_allocator` in submodules #51335

mark-i-m commented Jun 4, 2018

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mark-i-m commented Jun 23, 2018

oli-obk commented Jun 23, 2018

bors commented Jun 23, 2018

mark-i-m commented Jun 24, 2018

bors commented Jun 24, 2018

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oli-obk commented Jun 25, 2018

bors commented Jun 25, 2018

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bors commented Jun 25, 2018

bors commented Jun 25, 2018

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mark-i-m commented Jun 28, 2018

pietroalbini commented Jun 28, 2018

Prohibit global_allocator in submodules #51335

Prohibit global_allocator in submodules #51335

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Prohibit `global_allocator` in submodules #51335

Prohibit `global_allocator` in submodules #51335