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cmd/compile: PGO matching doesn't escape package paths #59887

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prattmic opened this issue Apr 28, 2023 · 1 comment
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cmd/compile: PGO matching doesn't escape package paths #59887

prattmic opened this issue Apr 28, 2023 · 1 comment
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compiler/runtime Issues related to the Go compiler and/or runtime. NeedsFix The path to resolution is known, but the work has not been done.
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Go1.21

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Package paths that have a dot in the last component get escaped in the symbol table (and thus in profiles). e.g., in package example.com, main becomes example%2ecom.main.

When matching function names in the profile to functions in the source, we do a naive combination of package path and name (via ir.PkgFuncName), meaning we will fail to match these.

Dots in the last component of package paths are fairly rare. Most common is probably in gopkg.in/something.v1.

cc @cherrymui
@prattmic prattmic added the NeedsFix The path to resolution is known, but the work has not been done. label Apr 28, 2023
@prattmic prattmic added this to the Go1.21 milestone Apr 28, 2023
@prattmic prattmic self-assigned this Apr 28, 2023
@gopherbot gopherbot added the compiler/runtime Issues related to the Go compiler and/or runtime. label Apr 28, 2023
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Change https://go.dev/cl/490555 mentions this issue: cmd/compile: escape package path for PGO symbol matching

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compiler/runtime Issues related to the Go compiler and/or runtime. NeedsFix The path to resolution is known, but the work has not been done.
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