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panic while handling some //line directives #288

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flimzy opened this issue Oct 24, 2023 · 2 comments
Closed

panic while handling some //line directives #288

flimzy opened this issue Oct 24, 2023 · 2 comments

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@flimzy
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flimzy commented Oct 24, 2023

Parsing of this file causes gofumpt to panic. It appears to be related to //line directives.

$ gofumpt -w pkg/logql/log/pattern/lexer.rl.go 
panic: invalid line number 4 (should be < 4) [recovered]
        panic: invalid line number 4 (should be < 4)

goroutine 8 [running]:
golang.org/x/tools/go/ast/astutil.Apply.func1()
        /home/jonhall/go/pkg/mod/golang.org/x/tools@v0.9.3/go/ast/astutil/rewrite.go:48 +0xab
panic({0x66f1e0?, 0xc00002d600?})
        /usr/local/go/src/runtime/panic.go:914 +0x21f
go/token.(*File).MergeLine(0xc0000829c0, 0xc000128140?)
        /usr/local/go/src/go/token/position.go:152 +0x1c8
mvdan.cc/gofumpt/format.(*fumpter).removeLines(...)
        /home/jonhall/src/gofumpt/format/format.go:249
mvdan.cc/gofumpt/format.(*fumpter).removeLinesBetween(0xc00008dd60, 0xc00002d420?, 0x1038?)
        /home/jonhall/src/gofumpt/format/format.go:257 +0x13f
mvdan.cc/gofumpt/format.(*fumpter).applyPre(0xc00008dd60, 0xc000082a30)
        /home/jonhall/src/gofumpt/format/format.go:545 +0x7b2
mvdan.cc/gofumpt/format.File.func1(0xc000082a30)
        /home/jonhall/src/gofumpt/format/format.go:109 +0x34
golang.org/x/tools/go/ast/astutil.(*application).apply(0xc000082a20, {0x723e98?, 0xc000136300?}, {0x6bf529?, 0x0?}, 0x0?, {0x723998?, 0xc0001362d0?})
        /home/jonhall/go/pkg/mod/golang.org/x/tools@v0.9.3/go/ast/astutil/rewrite.go:199 +0x1aa
golang.org/x/tools/go/ast/astutil.(*application).apply(0xc000082a20, {0x723998?, 0xc000136330?}, {0x6bf69d?, 0x1?}, 0x1?, {0x723e98?, 0xc000136300?})
        /home/jonhall/go/pkg/mod/golang.org/x/tools@v0.9.3/go/ast/astutil/rewrite.go:368 +0x187b
golang.org/x/tools/go/ast/astutil.(*application).applyList(0xc000082a20, {0x723998?, 0xc000136330}, {0x6bf69d, 0x4})
        /home/jonhall/go/pkg/mod/golang.org/x/tools@v0.9.3/go/ast/astutil/rewrite.go:484 +0xa5
golang.org/x/tools/go/ast/astutil.(*application).apply(0xc000082a20, {0x723f38?, 0xc000132c80?}, {0x6bf529?, 0x0?}, 0x0?, {0x723998?, 0xc000136330?})
        /home/jonhall/go/pkg/mod/golang.org/x/tools@v0.9.3/go/ast/astutil/rewrite.go:353 +0x15a5
golang.org/x/tools/go/ast/astutil.(*application).apply(0xc000082a20, {0x723998?, 0xc000136570?}, {0x6bf69d?, 0x4b850e?}, 0x698d20?, {0x723f38?, 0xc000132c80?})
        /home/jonhall/go/pkg/mod/golang.org/x/tools@v0.9.3/go/ast/astutil/rewrite.go:386 +0x1bdb
golang.org/x/tools/go/ast/astutil.(*application).applyList(0xc000082a20, {0x723998?, 0xc000136570}, {0x6bf69d, 0x4})
        /home/jonhall/go/pkg/mod/golang.org/x/tools@v0.9.3/go/ast/astutil/rewrite.go:484 +0xa5
golang.org/x/tools/go/ast/astutil.(*application).apply(0xc000082a20, {0x723998?, 0xc0001365a0?}, {0x6bf69d?, 0x1?}, 0x1?, {0x723998?, 0xc000136570?})
        /home/jonhall/go/pkg/mod/golang.org/x/tools@v0.9.3/go/ast/astutil/rewrite.go:353 +0x15a5
golang.org/x/tools/go/ast/astutil.(*application).applyList(0xc000082a20, {0x723998?, 0xc0001365a0}, {0x6bf69d, 0x4})
        /home/jonhall/go/pkg/mod/golang.org/x/tools@v0.9.3/go/ast/astutil/rewrite.go:484 +0xa5
golang.org/x/tools/go/ast/astutil.(*application).apply(0xc000082a20, {0x724050?, 0xc0001365d0?}, {0x6bf529?, 0x0?}, 0x0?, {0x723998?, 0xc0001365a0?})
        /home/jonhall/go/pkg/mod/golang.org/x/tools@v0.9.3/go/ast/astutil/rewrite.go:353 +0x15a5
golang.org/x/tools/go/ast/astutil.(*application).apply(0xc000082a20, {0x724078?, 0xc0000d46e0?}, {0x6bf95e?, 0x40d1da?}, 0x34?, {0x724050?, 0xc0001365d0?})
        /home/jonhall/go/pkg/mod/golang.org/x/tools@v0.9.3/go/ast/astutil/rewrite.go:429 +0x225d
golang.org/x/tools/go/ast/astutil.(*application).applyList(0xc000082a20, {0x724078?, 0xc0000d46e0}, {0x6bf95e, 0x5})
        /home/jonhall/go/pkg/mod/golang.org/x/tools@v0.9.3/go/ast/astutil/rewrite.go:484 +0xa5
golang.org/x/tools/go/ast/astutil.(*application).apply(0xc000082a20, {0x7242d8?, 0xc00002d5e0?}, {0x6bf699?, 0x697fe0?}, 0xc000129cb0?, {0x724078?, 0xc0000d46e0?})
        /home/jonhall/go/pkg/mod/golang.org/x/tools@v0.9.3/go/ast/astutil/rewrite.go:435 +0x230e
golang.org/x/tools/go/ast/astutil.Apply({0x724078?, 0xc0000d46e0}, 0xc000010c78, 0xc000010c90)
        /home/jonhall/go/pkg/mod/golang.org/x/tools@v0.9.3/go/ast/astutil/rewrite.go:53 +0x152
mvdan.cc/gofumpt/format.File(0xc00009e640, 0xc0000d46e0, {{0xc000012f58, 0x5}, {0xc00001a360, 0x17}, 0x0})
        /home/jonhall/src/gofumpt/format/format.go:157 +0x2d7
main.processFile({0x7ffe5617be4a, 0x21}, {0x725828, 0xc0000964e0}, {0x0?, 0x0?}, 0x0?, 0x1)
        /home/jonhall/src/gofumpt/gofmt.go:313 +0x308
main.gofmtMain.func3(0x0?)
        /home/jonhall/src/gofumpt/gofmt.go:508 +0x34
main.(*sequencer).Add.func2()
        /home/jonhall/src/gofumpt/gofmt.go:191 +0x42
created by main.(*sequencer).Add in goroutine 1
        /home/jonhall/src/gofumpt/gofmt.go:190 +0x1ae
@flimzy
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flimzy commented Oct 24, 2023

Similar panic in the stdlib on this file, although this one appears to be intentionally "broken" (not sure if that means gofumpt should actually panic, though):

$ gofumpt -w test/dwarf/linedirectives.go 
panic: invalid line number 289 (should be < 83) [recovered]
        panic: invalid line number 289 (should be < 83)

goroutine 19 [running]:
golang.org/x/tools/go/ast/astutil.Apply.func1()
        /home/jonhall/go/pkg/mod/golang.org/x/tools@v0.9.3/go/ast/astutil/rewrite.go:48 +0xab
panic({0x66f1e0?, 0xc0001143d0?})
        /usr/local/go/src/runtime/panic.go:914 +0x21f
go/token.(*File).MergeLine(0xc000134480, 0xc000112a48?)
        /usr/local/go/src/go/token/position.go:152 +0x1c8
mvdan.cc/gofumpt/format.(*fumpter).removeLines(...)
        /home/jonhall/src/gofumpt/format/format.go:249
mvdan.cc/gofumpt/format.(*fumpter).removeLinesBetween(0xc0001320a0, 0xc00015c200?, 0x5b8?)
        /home/jonhall/src/gofumpt/format/format.go:257 +0x13f
mvdan.cc/gofumpt/format.(*fumpter).applyPre(0xc0001320a0, 0xc0001344f0)
        /home/jonhall/src/gofumpt/format/format.go:545 +0x7b2
mvdan.cc/gofumpt/format.File.func1(0xc0001344f0)
        /home/jonhall/src/gofumpt/format/format.go:109 +0x34
golang.org/x/tools/go/ast/astutil.(*application).apply(0xc0001344e0, {0x724050?, 0xc00011a420?}, {0x6bf529?, 0x0?}, 0x0?, {0x723998?, 0xc00011a3f0?})
        /home/jonhall/go/pkg/mod/golang.org/x/tools@v0.9.3/go/ast/astutil/rewrite.go:199 +0x1aa
golang.org/x/tools/go/ast/astutil.(*application).apply(0xc0001344e0, {0x724078?, 0xc0001520a0?}, {0x6bf95e?, 0x40d1da?}, 0x14?, {0x724050?, 0xc00011a420?})
        /home/jonhall/go/pkg/mod/golang.org/x/tools@v0.9.3/go/ast/astutil/rewrite.go:429 +0x225d
golang.org/x/tools/go/ast/astutil.(*application).applyList(0xc0001344e0, {0x724078?, 0xc0001520a0}, {0x6bf95e, 0x5})
        /home/jonhall/go/pkg/mod/golang.org/x/tools@v0.9.3/go/ast/astutil/rewrite.go:484 +0xa5
golang.org/x/tools/go/ast/astutil.(*application).apply(0xc0001344e0, {0x7242d8?, 0xc0001143a0?}, {0x6bf699?, 0x697fe0?}, 0x6b7040?, {0x724078?, 0xc0001520a0?})
        /home/jonhall/go/pkg/mod/golang.org/x/tools@v0.9.3/go/ast/astutil/rewrite.go:435 +0x230e
golang.org/x/tools/go/ast/astutil.Apply({0x724078?, 0xc0001520a0}, 0xc000128b58, 0xc000128b70)
        /home/jonhall/go/pkg/mod/golang.org/x/tools@v0.9.3/go/ast/astutil/rewrite.go:53 +0x152
mvdan.cc/gofumpt/format.File(0xc000116080, 0xc0001520a0, {{0x6bf2e6, 0x2}, {0x0, 0x0}, 0x0})
        /home/jonhall/src/gofumpt/format/format.go:157 +0x2d7
main.processFile({0x7ffd6c1f2e83, 0x1c}, {0x725828, 0xc0000964e0}, {0x0?, 0x0?}, 0x0?, 0x1)
        /home/jonhall/src/gofumpt/gofmt.go:313 +0x308
main.gofmtMain.func3(0x0?)
        /home/jonhall/src/gofumpt/gofmt.go:508 +0x34
main.(*sequencer).Add.func2()
        /home/jonhall/src/gofumpt/gofmt.go:191 +0x42
created by main.(*sequencer).Add in goroutine 1
        /home/jonhall/src/gofumpt/gofmt.go:190 +0x1ae

@flimzy flimzy mentioned this issue Oct 24, 2023
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@mvdan mvdan closed this as completed in 37e0463 Jan 28, 2024
@mvdan
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mvdan commented Jan 28, 2024

Thanks for spotting - I've never liked those line directives to be honest. They are definitely an obstacle for a formatter.

@BrewTestBot BrewTestBot mentioned this issue Jan 29, 2024
Merged
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@mvdan @flimzy