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panic: runtime error: invalid memory address or nil pointer dereference #59

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panic: runtime error: invalid memory address or nil pointer dereference#59
@graywolf-s1

Description

@graywolf-s1
graywolf-s1
opened on Nov 12, 2024

Before submitting an issue, please make sure:

  • You're running Go 1.6 or later
  • You've tried installing with go get -u to update dependencies

If you see the following error, you need to update to Go 1.6+:

$ go get github.com/zmb3/gogetdoc
# github.com/zmb3/gogetdoc
./ident.go:142: c.Val().ExactString undefined (type constant.Value has no field or method ExactString)

Hello,

when I try to run the example from the readme, the gogetdoc panics:

$ go install github.com/zmb3/gogetdoc@latest
$ ~/go/bin/gogetdoc -pos "$(go env GOROOT)/src/fmt/format.go:#2351"
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
	panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x0 pc=0x1051c7d74]

goroutine 12 [running]:
go/types.(*Checker).handleBailout(0x14000083500, 0x140001a5c98)
	/opt/local/lib/go/src/go/types/check.go:404 +0x9c
panic({0x105338760?, 0x10554da80?})
	/opt/local/lib/go/src/runtime/panic.go:785 +0x124
go/types.(*StdSizes).Sizeof(0x0, {0x105383be8, 0x1055512c0})
	/opt/local/lib/go/src/go/types/sizes.go:229 +0x314
go/types.(*Config).sizeof(...)
	/opt/local/lib/go/src/go/types/sizes.go:334
go/types.representableConst.func1({0x105383be8?, 0x1055512c0?})
	/opt/local/lib/go/src/go/types/const.go:77 +0x90
go/types.representableConst({0x105385458, 0x105544fd8}, 0x14000083500, 0x1055512c0, 0x140001a49d8)
	/opt/local/lib/go/src/go/types/const.go:107 +0x2ac
go/types.(*Checker).representation(0x14000083500, 0x140004cd000, 0x1055512c0)
	/opt/local/lib/go/src/go/types/const.go:257 +0x68
go/types.(*Checker).representable(0x14000083500, 0x140004cd000, 0x1055512c0)
	/opt/local/lib/go/src/go/types/const.go:240 +0x28
go/types.(*Checker).shift(0x14000083500, 0x140004ccf80, 0x140004cd000, {0x105384ad8, 0x140000a8060}, 0x14)
	/opt/local/lib/go/src/go/types/expr.go:652 +0x1d4
go/types.(*Checker).binary(0x14000083500, 0x140004ccf80, {0x105384ad8, 0x140000a8060}, {0x105384fe8, 0x14000092580}, {0x105384fe8, 0x140000925a0}, 0x14, 0x1c4a)
	/opt/local/lib/go/src/go/types/expr.go:798 +0x100
go/types.(*Checker).exprInternal(0x14000083500, 0x0, 0x140004ccf80, {0x105384ad8, 0x140000a8060}, {0x0, 0x0})
	/opt/local/lib/go/src/go/types/expr.go:1452 +0x1d4
go/types.(*Checker).rawExpr(0x14000083500, 0x0, 0x140004ccf80, {0x105384ad8?, 0x140000a8060?}, {0x0?, 0x0?}, 0x0)
	/opt/local/lib/go/src/go/types/expr.go:981 +0x120
go/types.(*Checker).expr(0x14000083500, 0x0?, 0x140004ccf80, {0x105384ad8?, 0x140000a8060?})
	/opt/local/lib/go/src/go/types/expr.go:1549 +0x38
go/types.(*Checker).binary(0x14000083500, 0x140004ccf80, {0x105384ad8, 0x140000a8090}, {0x105384ad8, 0x140000a8060}, {0x105384fe8, 0x140000925c0}, 0xd, 0x1c4e)
	/opt/local/lib/go/src/go/types/expr.go:785 +0x70
go/types.(*Checker).exprInternal(0x14000083500, 0x0, 0x140004ccf80, {0x105384ad8, 0x140000a8090}, {0x0, 0x0})
	/opt/local/lib/go/src/go/types/expr.go:1452 +0x1d4
go/types.(*Checker).rawExpr(0x14000083500, 0x0, 0x140004ccf80, {0x105384ad8?, 0x140000a8090?}, {0x0?, 0x0?}, 0x0)
	/opt/local/lib/go/src/go/types/expr.go:981 +0x120
go/types.(*Checker).expr(0x14000083500, 0x105197f68?, 0x140004ccf80, {0x105384ad8?, 0x140000a8090?})
	/opt/local/lib/go/src/go/types/expr.go:1549 +0x38
go/types.(*Checker).constDecl(0x14000083500, 0x14000095260, {0x0, 0x0}, {0x105384ad8, 0x140000a8090}, 0x0)
	/opt/local/lib/go/src/go/types/decl.go:480 +0x228
go/types.(*Checker).objDecl(0x14000083500, {0x105388958, 0x14000095260}, 0x0)
	/opt/local/lib/go/src/go/types/decl.go:185 +0x840
go/types.(*Checker).packageObjects(0x14000083500)
	/opt/local/lib/go/src/go/types/resolver.go:714 +0x3f0
go/types.(*Checker).checkFiles(0x14000083500, {0x140000a6000, 0x1, 0x1})
	/opt/local/lib/go/src/go/types/check.go:459 +0x190
go/types.(*Checker).Files(0x1400013a460?, {0x140000a6000?, 0x140000941e0?, 0x4?})
	/opt/local/lib/go/src/go/types/check.go:422 +0x80
golang.org/x/tools/go/packages.(*loader).loadPackage(0x1400013a460, 0x140002e2b00)
	/Users/user/go/pkg/mod/golang.org/x/tools@v0.0.0-20181207195948-8634b1ecd393/go/packages/packages.go:711 +0x488
golang.org/x/tools/go/packages.(*loader).loadRecursive.func1()
	/Users/user/go/pkg/mod/golang.org/x/tools@v0.0.0-20181207195948-8634b1ecd393/go/packages/packages.go:571 +0x178
sync.(*Once).doSlow(0x0?, 0x0?)
	/opt/local/lib/go/src/sync/once.go:76 +0xf8
sync.(*Once).Do(...)
	/opt/local/lib/go/src/sync/once.go:67
golang.org/x/tools/go/packages.(*loader).loadRecursive(0x0?, 0x0?)
	/Users/user/go/pkg/mod/golang.org/x/tools@v0.0.0-20181207195948-8634b1ecd393/go/packages/packages.go:558 +0x48
golang.org/x/tools/go/packages.(*loader).loadRecursive.func1.1(0x0?)
	/Users/user/go/pkg/mod/golang.org/x/tools@v0.0.0-20181207195948-8634b1ecd393/go/packages/packages.go:565 +0x30
created by golang.org/x/tools/go/packages.(*loader).loadRecursive.func1 in goroutine 8
	/Users/user/go/pkg/mod/golang.org/x/tools@v0.0.0-20181207195948-8634b1ecd393/go/packages/packages.go:564 +0x84
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
	panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x0 pc=0x1051c7d74]

goroutine 84 [running]:
go/types.(*Checker).handleBailout(0x14000632540, 0x1400053dc98)
	/opt/local/lib/go/src/go/types/check.go:404 +0x9c
panic({0x105338760?, 0x10554da80?})
	/opt/local/lib/go/src/runtime/panic.go:785 +0x124
go/types.(*StdSizes).Sizeof(0x0, {0x105383be8, 0x105551220})
	/opt/local/lib/go/src/go/types/sizes.go:229 +0x314
go/types.(*Config).sizeof(...)
	/opt/local/lib/go/src/go/types/sizes.go:334
go/types.representableConst.func1({0x105383be8?, 0x105551220?})
	/opt/local/lib/go/src/go/types/const.go:77 +0x90
go/types.representableConst({0x105385458, 0x105545020}, 0x14000632540, 0x105551220, 0x0)
	/opt/local/lib/go/src/go/types/const.go:93 +0x134
go/types.(*Checker).arrayLength(0x14000632540, {0x105384fe8, 0x1400063c160?})
	/opt/local/lib/go/src/go/types/typexpr.go:537 +0x1bc
go/types.(*Checker).typInternal(0x14000632540, {0x1053848f8, 0x1400061c780}, 0x0)
	/opt/local/lib/go/src/go/types/typexpr.go:320 +0x3b0
go/types.(*Checker).definedType(0x14000632540, {0x1053848f8, 0x1400061c780}, 0x1400053d4a0?)
	/opt/local/lib/go/src/go/types/typexpr.go:201 +0x28
go/types.(*Checker).varType(0x14000632540, {0x1053848f8, 0x1400061c780})
	/opt/local/lib/go/src/go/types/typexpr.go:166 +0x2c
go/types.(*Checker).structType(0x14000632540, 0x1400061d140, 0x1400061d140?)
	/opt/local/lib/go/src/go/types/struct.go:114 +0x11c
go/types.(*Checker).typInternal(0x14000632540, {0x105384778, 0x1400060a2e8}, 0x14000646870)
	/opt/local/lib/go/src/go/types/typexpr.go:337 +0xc20
go/types.(*Checker).definedType(0x14000632540, {0x105384778, 0x1400060a2e8}, 0x105051c54?)
	/opt/local/lib/go/src/go/types/typexpr.go:201 +0x28
go/types.(*Checker).typeDecl(0x14000632540, 0x14000646870, 0x14000644080, 0x0)
	/opt/local/lib/go/src/go/types/decl.go:649 +0x454
go/types.(*Checker).objDecl(0x14000632540, {0x1053889f8, 0x14000646870}, 0x0)
	/opt/local/lib/go/src/go/types/decl.go:191 +0x874
go/types.(*Checker).packageObjects(0x14000632540)
	/opt/local/lib/go/src/go/types/resolver.go:702 +0x350
go/types.(*Checker).checkFiles(0x14000632540, {0x14000428020, 0x1, 0x1})
	/opt/local/lib/go/src/go/types/check.go:459 +0x190
go/types.(*Checker).Files(0x1400013a460?, {0x14000428020?, 0x1400041a900?, 0x5?})
	/opt/local/lib/go/src/go/types/check.go:422 +0x80
golang.org/x/tools/go/packages.(*loader).loadPackage(0x1400013a460, 0x140002e28a0)
	/Users/user/go/pkg/mod/golang.org/x/tools@v0.0.0-20181207195948-8634b1ecd393/go/packages/packages.go:711 +0x488
golang.org/x/tools/go/packages.(*loader).loadRecursive.func1()
	/Users/user/go/pkg/mod/golang.org/x/tools@v0.0.0-20181207195948-8634b1ecd393/go/packages/packages.go:571 +0x178
sync.(*Once).doSlow(0x0?, 0x0?)
	/opt/local/lib/go/src/sync/once.go:76 +0xf8
sync.(*Once).Do(...)
	/opt/local/lib/go/src/sync/once.go:67
golang.org/x/tools/go/packages.(*loader).loadRecursive(0x0?, 0x0?)
	/Users/user/go/pkg/mod/golang.org/x/tools@v0.0.0-20181207195948-8634b1ecd393/go/packages/packages.go:558 +0x48
golang.org/x/tools/go/packages.(*loader).loadRecursive.func1.1(0x0?)
	/Users/user/go/pkg/mod/golang.org/x/tools@v0.0.0-20181207195948-8634b1ecd393/go/packages/packages.go:565 +0x30
created by golang.org/x/tools/go/packages.(*loader).loadRecursive.func1 in goroutine 65
	/Users/user/go/pkg/mod/golang.org/x/tools@v0.0.0-20181207195948-8634b1ecd393/go/packages/packages.go:564 +0x84

My golang version:

$ go version
go version go1.23.3 darwin/arm64

And os:

$ uname -a
Darwin host 23.6.0 Darwin Kernel Version 23.6.0: Mon Jul 29 21:14:30 PDT 2024; root:xnu-10063.141.2~1/RELEASE_ARM64_T6030 arm64 arm Darwin

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