Fix debuginfo for pointers/references to unsized types #93006

michaelwoerister · 2022-01-17T16:40:01Z

This PR makes the compiler emit fat pointer debuginfo in all cases. Before, we sometimes got thin-pointer debuginfo, making it impossible to fully interpret the pointed to memory in debuggers. The code is actually cleaner now, especially around generation of trait object pointer debuginfo.

Fixes #92718

~~Blocked on #92729.~~

rust-highfive · 2022-01-17T16:40:05Z

r? @oli-obk

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bors · 2022-01-18T03:24:18Z

☔ The latest upstream changes (presumably #93009) made this pull request unmergeable. Please resolve the merge conflicts.

michaelwoerister · 2022-01-19T12:08:34Z

This PR makes type names, that are part of a pointer type, fully qualified. For example, &Foo<u8> becomes &my_crate::some_mod::Foo<u8>. This is the correct behavior, but it occurs to me that that might have performance implications.

@bors try @rust-timer queue

rust-timer · 2022-01-19T12:08:36Z

Awaiting bors try build completion.

@rustbot label: +S-waiting-on-perf

bors · 2022-01-19T12:08:43Z

⌛ Trying commit 756a70c with merge 5d8768a3a4a4ad49d5b52f745a6a48bda4ff3bf0...

bors · 2022-01-19T13:45:56Z

☀️ Try build successful - checks-actions
Build commit: 5d8768a3a4a4ad49d5b52f745a6a48bda4ff3bf0 (5d8768a3a4a4ad49d5b52f745a6a48bda4ff3bf0)

rust-timer · 2022-01-19T13:45:57Z

Queued 5d8768a3a4a4ad49d5b52f745a6a48bda4ff3bf0 with parent 2f004d2, future comparison URL.

rust-timer · 2022-01-19T15:46:48Z

Finished benchmarking commit (5d8768a3a4a4ad49d5b52f745a6a48bda4ff3bf0): comparison url.

Summary: This benchmark run did not return any relevant changes.

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. While you can manually mark this PR as fit for rollup, we strongly recommend not doing so since this PR led to changes in compiler perf.

@bors rollup=never
@rustbot label: +S-waiting-on-review -S-waiting-on-perf -perf-regression

oli-obk · 2022-01-19T16:01:04Z

This lgtm from a pure impl perspective, but I think someone who knows llvm should look over it

r? rust-lang/wg-llvm

oli-obk · 2022-01-19T16:01:30Z

r? @rust-lang/wg-llvm

michaelwoerister · 2022-01-20T09:25:17Z

There doesn't seem to be an LLVM group in https://github.com/rust-lang/highfive/blob/master/highfive/configs/rust-lang/rust.json yet.

r? @davidtwco, who knows debuginfo well (but feel free to re-assign if you don't want to review!)

davidtwco

This looks good to me, two small nits but otherwise I think this is good.

compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs

michaelwoerister · 2022-01-21T10:32:59Z

Thanks for the reviews! Comments should be addressed now.

…ge doc comment so it is not interpreted as doc-test.

michaelwoerister · 2022-01-27T20:11:57Z

Fix doc-comment so it's not interpreted as doctest.

@bors r=davidtwco,oli-obk

bors · 2022-01-27T20:11:58Z

📌 Commit d33e317 has been approved by davidtwco,oli-obk

bors · 2022-01-28T04:37:02Z

⌛ Testing commit d33e317 with merge bcca153730480e04fc3eae2166fc3b6c07942047...

bors · 2022-01-28T06:28:04Z

💔 Test failed - checks-actions

…t mark fat pointer fields as artificial. LLDB does not seem to see fields if they are marked with DW_AT_artificial which breaks pretty printers that use these fields for decoding fat pointers.

rust-log-analyzer · 2022-01-28T10:29:35Z

The job x86_64-gnu-llvm-12 failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)


running 165 tests
...................................i........

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/i686-unknown-linux-gnu/lib" "--rustc-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "--src-base" "/checkout/src/test/mir-opt" "--build-base" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/mir-opt" "--stage-id" "stage2-i686-unknown-linux-gnu" "--suite" "mir-opt" "--mode" "mir-opt" "--target" "i686-unknown-linux-gnu" "--host" "x86_64-unknown-linux-gnu" "--llvm-filecheck" "/usr/lib/llvm-12/bin/FileCheck" "--nodejs" "/usr/bin/node" "--linker" "cc" "--host-rustcflags" "-Crpath -O -Cdebuginfo=0  -Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--target-rustcflags" "-Crpath -O -Cdebuginfo=0  -Lnative=/checkout/obj/build/i686-unknown-linux-gnu/native/rust-test-helpers" "--docck-python" "/usr/bin/python3" "--lldb-python" "/usr/bin/python3" "--gdb" "/usr/bin/gdb" "--quiet" "--llvm-version" "12.0.0" "--llvm-components" "aarch64 aarch64asmparser aarch64codegen aarch64desc aarch64disassembler aarch64info aarch64utils aggressiveinstcombine all all-targets amdgpu amdgpuasmparser amdgpucodegen amdgpudesc amdgpudisassembler amdgpuinfo amdgpuutils analysis arm armasmparser armcodegen armdesc armdisassembler arminfo armutils asmparser asmprinter avr avrasmparser avrcodegen avrdesc avrdisassembler avrinfo binaryformat bitreader bitstreamreader bitwriter bpf bpfasmparser bpfcodegen bpfdesc bpfdisassembler bpfinfo cfguard codegen core coroutines coverage debuginfocodeview debuginfodwarf debuginfogsym debuginfomsf debuginfopdb demangle dlltooldriver dwarflinker engine executionengine extensions filecheck frontendopenacc frontendopenmp fuzzmutate globalisel hellonew hexagon hexagonasmparser hexagoncodegen hexagondesc hexagondisassembler hexagoninfo instcombine instrumentation interfacestub interpreter ipo irreader jitlink lanai lanaiasmparser lanaicodegen lanaidesc lanaidisassembler lanaiinfo libdriver lineeditor linker lto mc mca mcdisassembler mcjit mcparser mips mipsasmparser mipscodegen mipsdesc mipsdisassembler mipsinfo mirparser msp430 msp430asmparser msp430codegen msp430desc msp430disassembler msp430info native nativecodegen nvptx nvptxcodegen nvptxdesc nvptxinfo objcarcopts object objectyaml option orcjit orcshared orctargetprocess passes perfjitevents powerpc powerpcasmparser powerpccodegen powerpcdesc powerpcdisassembler powerpcinfo profiledata remarks riscv riscvasmparser riscvcodegen riscvdesc riscvdisassembler riscvinfo runtimedyld scalaropts selectiondag sparc sparcasmparser sparccodegen sparcdesc sparcdisassembler sparcinfo support symbolize systemz systemzasmparser systemzcodegen systemzdesc systemzdisassembler systemzinfo tablegen target textapi transformutils vectorize webassembly webassemblyasmparser webassemblycodegen webassemblydesc webassemblydisassembler webassemblyinfo windowsmanifest x86 x86asmparser x86codegen x86desc x86disassembler x86info xcore xcorecodegen xcoredesc xcoredisassembler xcoreinfo xray" "--cc" "" "--cxx" "" "--cflags" "" "--adb-path" "adb" "--adb-test-dir" "/data/tmp/work" "--android-cross-path" "" "--channel" "nightly" "--color" "always"
expected success, got: signal: 11 (core dumped)

Build completed unsuccessfully in 0:01:48

michaelwoerister · 2022-01-28T11:47:30Z

@rust-lang/infra This is the second time in this PR that there's a core dump in compiletest after mir-opt testing: https://github.com/rust-lang/rust/runs/4978717078?check_suite_focus=true#step:26:3567
I was not able to reproduce the crash locally. Is this a known issue?

michaelwoerister · 2022-01-28T11:49:29Z

I was able to reproduce the LLDB test failures on Linux. The last commit removes the DW_AT_artifical attribute from fat pointer fields (as was the case before this PR). That allows LLDB to see the fields again.

@bors r=davidtwco,oli-obk

bors · 2022-01-28T11:49:31Z

📌 Commit c10f9e7 has been approved by davidtwco,oli-obk

bors · 2022-01-28T12:46:17Z

⌛ Testing commit c10f9e7 with merge 427eba2...

bors · 2022-01-28T15:44:39Z

☀️ Test successful - checks-actions
Approved by: davidtwco,oli-obk
Pushing 427eba2 to master...

rust-timer · 2022-01-28T17:15:51Z

Finished benchmarking commit (427eba2): comparison url.

Summary: This benchmark run did not return any relevant results.

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.

@rustbot label: -perf-regression

michaelwoerister added A-debuginfo Area: Debugging information in compiled programs (DWARF, PDB, etc.) S-blocked Status: Marked as blocked ❌ on something else such as an RFC or other implementation work. labels Jan 17, 2022

rust-highfive assigned oli-obk Jan 17, 2022

rustbot added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Jan 17, 2022

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jan 17, 2022

michaelwoerister force-pushed the fix-unsized-ptr-debuginfo branch 2 times, most recently from f57d9de to 3da8b15 Compare January 17, 2022 17:00

michaelwoerister force-pushed the fix-unsized-ptr-debuginfo branch from 3da8b15 to 756a70c Compare January 18, 2022 10:06

michaelwoerister removed the S-blocked Status: Marked as blocked ❌ on something else such as an RFC or other implementation work. label Jan 18, 2022

michaelwoerister mentioned this pull request Jan 19, 2022

debuginfo: Don't emit DW_AT_address_class attribute for pointer type debuginfo. #93070

Closed

rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Jan 19, 2022

rustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Jan 19, 2022

rust-highfive assigned davidtwco and unassigned oli-obk Jan 20, 2022

davidtwco requested changes Jan 21, 2022

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bors added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jan 27, 2022

[debuginfo] Fix and unify handling of fat pointers in debuginfo: Chan…

d33e317

…ge doc comment so it is not interpreted as doc-test.

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 Jan 27, 2022

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bors added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Jan 28, 2022

[debuginfo] Fix and unify handling of fat pointers in debuginfo: Don'…

c10f9e7

…t mark fat pointer fields as artificial. LLDB does not seem to see fields if they are marked with DW_AT_artificial which breaks pretty printers that use these fields for decoding fat pointers.

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 Jan 28, 2022

bors added the merged-by-bors This PR was explicitly merged by bors. label Jan 28, 2022

bors merged commit 427eba2 into rust-lang:master Jan 28, 2022

rustbot added this to the 1.60.0 milestone Jan 28, 2022

bors mentioned this pull request Jan 28, 2022

Fix stack overflows when compiling high-recursion_limit programs #93056

Closed

michaelwoerister mentioned this pull request Jan 28, 2022

debug info emitted for trait objects has wrong size/alignment #88873

Closed

wesleywiser mentioned this pull request Feb 10, 2022

ICE: unsized_tuple_coercion with debuginfo=2 #93871

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This was referenced Feb 17, 2022

rust bootstrap ICE with debuginfo=2 #93866

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Compiler bootstrap infrastructure and tests should be exercising -g more aggressively #94262

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Fix debuginfo for pointers/references to unsized types #93006

Fix debuginfo for pointers/references to unsized types #93006

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Fix debuginfo for pointers/references to unsized types #93006

Fix debuginfo for pointers/references to unsized types #93006

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