Don't unwind when hitting the macro expansion recursion limit #69497

Zoxc · 2020-02-26T22:46:33Z

This removes one use of FatalError.raise().

Zoxc · 2020-02-27T01:09:25Z

Hm.. it seems like ui\issues\issue-16098.rs relies on the early exit here to avoid long compile times.

macro_rules! prob1 {
    (0) => {
        0
    };
    ($n:expr) => {
        if ($n % 3 == 0) || ($n % 5 == 0) {
            $n + prob1!($n - 1); //~ ERROR recursion limit reached while expanding `prob1!`
        } else {
            prob1!($n - 1);
        }
    };
}

fn main() {
    println!("Problem 1: {}", prob1!(1000));
}

petrochenkov · 2020-02-27T09:00:53Z

it seems like ui\issues\issue-16098.rs relies on the early exit here to avoid long compile times.

Interesting, I wanted to remove this fatal error too, and expected producing a dummy fragment to work.

petrochenkov · 2020-02-27T10:25:25Z

Each call to error_recursion_limit_reached could halve the recursion limit and silence all the following recursion limit messages for the current ExtCtxt.

Zoxc · 2020-02-29T20:12:57Z

@petrochenkov I tried using an early exit from expand_invoc once the recursion limit was hit. That wasn't sufficient to make issue-16098.rs complete in a timely manner.

petrochenkov · 2020-03-01T13:50:42Z

The problem here is not entirely in expansion.
With #69497 (comment) rustc --pretty=expanded issue-16098.rs completes in less than a second.

The generated AST is enormous though, so later compilation phases take a lot of time (~7.5 minutes).

bors · 2020-03-07T12:14:38Z

☔ The latest upstream changes (presumably #69796) made this pull request unmergeable. Please resolve the merge conflicts.

rust-highfive · 2020-03-14T21:43:50Z

The job x86_64-gnu-llvm-7 of your PR failed (pretty log, 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.

2020-03-14T20:34:08.1259859Z ========================== Starting Command Output ===========================
2020-03-14T20:34:08.1262746Z [command]/bin/bash --noprofile --norc /home/vsts/work/_temp/7b4291e2-8b59-4308-ba37-819cbfe8cf11.sh
2020-03-14T20:34:08.1263020Z 
2020-03-14T20:34:08.1268316Z ##[section]Finishing: Disable git automatic line ending conversion
2020-03-14T20:34:08.1287969Z ##[section]Starting: Checkout rust-lang/rust@refs/pull/69497/merge to s
2020-03-14T20:34:08.1291750Z Task         : Get sources
2020-03-14T20:34:08.1292037Z Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.
2020-03-14T20:34:08.1292312Z Version      : 1.0.0
2020-03-14T20:34:08.1292522Z Author       : Microsoft
---
2020-03-14T20:34:09.1104921Z ##[command]git remote add origin https://github.com/rust-lang/rust
2020-03-14T20:34:09.1111163Z ##[command]git config gc.auto 0
2020-03-14T20:34:09.1115494Z ##[command]git config --get-all http.https://github.com/rust-lang/rust.extraheader
2020-03-14T20:34:09.1119916Z ##[command]git config --get-all http.proxy
2020-03-14T20:34:09.1127144Z ##[command]git -c http.extraheader="AUTHORIZATION: basic ***" fetch --force --tags --prune --progress --no-recurse-submodules --depth=2 origin +refs/heads/*:refs/remotes/origin/* +refs/pull/69497/merge:refs/remotes/pull/69497/merge
---
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---
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---
2020-03-14T21:43:44.7322529Z failures:
2020-03-14T21:43:44.7344836Z 
2020-03-14T21:43:44.7345593Z ---- [ui] ui/macros/trace_faulty_macros.rs stdout ----
2020-03-14T21:43:44.7345821Z 
2020-03-14T21:43:44.7346705Z error: /checkout/src/test/ui/macros/trace_faulty_macros.rs:16: unexpected error: '16:9: 16:11: expected expression, found `A { a: a, b: 0, c: _, .. }`'
2020-03-14T21:43:44.7347475Z error: 1 unexpected errors found, 0 expected errors not found
2020-03-14T21:43:44.7347805Z status: exit code: 1
2020-03-14T21:43:44.7347805Z status: exit code: 1
2020-03-14T21:43:44.7350147Z command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/macros/trace_faulty_macros.rs" "-Zthreads=1" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/macros/trace_faulty_macros" "-Crpath" "-O" "-Cdebuginfo=0" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-A" "unused" "-Z" "trace-macros" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/macros/trace_faulty_macros/auxiliary"
2020-03-14T21:43:44.7351975Z     Error {
2020-03-14T21:43:44.7352205Z         line_num: 16,
2020-03-14T21:43:44.7352436Z         kind: Some(
2020-03-14T21:43:44.7352650Z             Error,
2020-03-14T21:43:44.7352650Z             Error,
2020-03-14T21:43:44.7352855Z         ),
2020-03-14T21:43:44.7353221Z         msg: "16:9: 16:11: expected expression, found `A { a: a, b: 0, c: _, .. }`",
2020-03-14T21:43:44.7353740Z ]
2020-03-14T21:43:44.7353857Z 
2020-03-14T21:43:44.7354563Z thread '[ui] ui/macros/trace_faulty_macros.rs' panicked at 'explicit panic', src/tools/compiletest/src/runtest.rs:1436:13
2020-03-14T21:43:44.7355115Z note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
---
2020-03-14T21:43:44.7357914Z 
2020-03-14T21:43:44.7368103Z thread 'main' panicked at 'Some tests failed', src/tools/compiletest/src/main.rs:348:22
2020-03-14T21:43:44.7368422Z 
2020-03-14T21:43:44.7368537Z 
2020-03-14T21:43:44.7372807Z command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools-bin/compiletest" "--compile-lib-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib" "--run-lib-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/lib" "--rustc-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "--src-base" "/checkout/src/test/ui" "--build-base" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui" "--stage-id" "stage2-x86_64-unknown-linux-gnu" "--mode" "ui" "--target" "x86_64-unknown-linux-gnu" "--host" "x86_64-unknown-linux-gnu" "--llvm-filecheck" "/usr/lib/llvm-7/bin/FileCheck" "--host-rustcflags" "-Crpath -O -Cdebuginfo=0 -Zunstable-options  -Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--target-rustcflags" "-Crpath -O -Cdebuginfo=0 -Zunstable-options  -Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--docck-python" "/usr/bin/python2.7" "--lldb-python" "/usr/bin/python2.7" "--gdb" "/usr/bin/gdb" "--quiet" "--llvm-version" "7.0.0\n" "--system-llvm" "--cc" "" "--cxx" "" "--cflags" "" "--llvm-components" "" "--adb-path" "adb" "--adb-test-dir" "/data/tmp/work" "--android-cross-path" "" "--color" "always"
2020-03-14T21:43:44.7380585Z 
2020-03-14T21:43:44.7380704Z 
2020-03-14T21:43:44.7381038Z failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test
2020-03-14T21:43:44.7381428Z Build completed unsuccessfully in 1:04:09
2020-03-14T21:43:44.7381428Z Build completed unsuccessfully in 1:04:09
2020-03-14T21:43:44.7442712Z == clock drift check ==
2020-03-14T21:43:44.7473607Z   local time: Sat Mar 14 21:43:44 UTC 2020
2020-03-14T21:43:45.0412661Z   network time: Sat, 14 Mar 2020 21:43:45 GMT
2020-03-14T21:43:45.0413060Z == end clock drift check ==
2020-03-14T21:43:45.4831811Z 
2020-03-14T21:43:45.4926770Z ##[error]Bash exited with code '1'.
2020-03-14T21:43:45.4944532Z ##[section]Finishing: Run build
2020-03-14T21:43:45.5001369Z ##[section]Starting: Checkout rust-lang/rust@refs/pull/69497/merge to s
2020-03-14T21:43:45.5007378Z Task         : Get sources
2020-03-14T21:43:45.5007895Z Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.
2020-03-14T21:43:45.5008367Z Version      : 1.0.0
2020-03-14T21:43:45.5008686Z Author       : Microsoft
2020-03-14T21:43:45.5008686Z Author       : Microsoft
2020-03-14T21:43:45.5009206Z Help         : [More Information](https://go.microsoft.com/fwlink/?LinkId=798199)
2020-03-14T21:43:45.5009809Z ==============================================================================
2020-03-14T21:43:45.8187829Z Cleaning any cached credential from repository: rust-lang/rust (GitHub)
2020-03-14T21:43:45.8242484Z ##[section]Finishing: Checkout rust-lang/rust@refs/pull/69497/merge to s
2020-03-14T21:43:45.8321299Z Cleaning up task key
2020-03-14T21:43:45.8322428Z Start cleaning up orphan processes.
2020-03-14T21:43:45.8498515Z Terminate orphan process: pid (3427) (python)
2020-03-14T21:43:45.8667186Z ##[section]Finishing: Finalize Job

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 @rust-lang/infra. (Feature Requests)

bors · 2020-03-17T05:30:22Z

☔ The latest upstream changes (presumably #70062) made this pull request unmergeable. Please resolve the merge conflicts.

Zoxc · 2020-03-17T15:27:02Z

I made the compiler exit early after macro expansion if a recursion limit was hit.

petrochenkov · 2020-03-17T19:17:26Z

@bors r+

bors · 2020-03-17T19:17:28Z

📌 Commit bdaf9e4 has been approved by petrochenkov

@petrochenkov

…nkov Don't unwind when hitting the macro expansion recursion limit This removes one use of `FatalError.raise()`. r? @petrochenkov

Centril · 2020-03-18T17:02:04Z

Failed in #70110 (comment), @bors r-

petrochenkov · 2020-03-18T19:19:18Z

@bors r+

bors · 2020-03-18T19:19:20Z

📌 Commit 43bee17836d416e440802512b9867042d95651fb has been approved by petrochenkov

bors · 2020-03-18T19:19:20Z

🌲 The tree is currently closed for pull requests below priority 5, this pull request will be tested once the tree is reopened

Zoxc · 2020-03-18T19:51:46Z

Still don't know why it failed in the rollup.

@bors r-

bors · 2020-03-19T03:43:07Z

☔ The latest upstream changes (presumably #70118) made this pull request unmergeable. Please resolve the merge conflicts.

Zoxc · 2020-03-20T22:12:17Z

Looks like the PR build also failed in #70110, which doesn't happen here. I'm going to assume some other PR was the cause of the failure.

@bors r=petrochenkov

bors · 2020-03-20T22:12:19Z

📌 Commit d641ad0 has been approved by petrochenkov

@ghost

Rollup of 6 pull requests Successful merges: - rust-lang#69497 (Don't unwind when hitting the macro expansion recursion limit) - rust-lang#69901 (add #[rustc_layout(debug)]) - rust-lang#69910 (Avoid query type in generics) - rust-lang#69955 (Fix abort-on-eprintln during process shutdown) - rust-lang#70032 (put type params in front of const params in generics_of) - rust-lang#70119 (rustc: use LocalDefId instead of DefId in TypeckTables.) Failed merges: r? @ghost

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Zoxc force-pushed the ast-fragment-error branch from 17312df to 511b73f Compare March 14, 2020 20:33

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petrochenkov changed the title ~~[WIP] Don't unwind when hitting the macro expansion recursion limit~~ Don't unwind when hitting the macro expansion recursion limit Mar 17, 2020

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 Mar 17, 2020

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Zoxc force-pushed the ast-fragment-error branch from bdaf9e4 to 43bee17 Compare March 18, 2020 17:06

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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 Mar 18, 2020

Zoxc added 2 commits March 19, 2020 14:59

Don't unwind when hitting the macro expansion recursion limit

82920f3

Update test

d641ad0

Zoxc force-pushed the ast-fragment-error branch from 43bee17 to d641ad0 Compare March 19, 2020 14:01

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Dylan-DPC-zz mentioned this pull request Mar 21, 2020

Rollup of 6 pull requests #70222

Merged

bors merged commit a6596f2 into rust-lang:master Mar 21, 2020

Zoxc deleted the ast-fragment-error branch March 21, 2020 19:16

Centril added a commit to Centril/rust that referenced this pull request Mar 21, 2020

fix rebase fallout due to rust-lang#69497.

4a67a1b

Centril mentioned this pull request Mar 21, 2020

Expand: nix all fatal errors #70074

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Centril added a commit to Centril/rust that referenced this pull request Mar 24, 2020

fix rebase fallout due to rust-lang#69497.

c415f12

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Don't unwind when hitting the macro expansion recursion limit #69497

Don't unwind when hitting the macro expansion recursion limit #69497

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Don't unwind when hitting the macro expansion recursion limit #69497

Don't unwind when hitting the macro expansion recursion limit #69497

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