6265ed7452
Background: when compiling a function, it's possible that a local variable will be optimized away, which could potentially degrade the debugging experience if the compiler fails to emit DWARF information for the variable's type. To mitigate this situation, the compiler emits R_USETYPE relocations for the function's auto/param variables as a signal to the linker to generate DWARF for the types in question, even if the type is not specifically attached to a DWARF param or var. This patch change the logic in the compiler to avoid emitting a R_USETYPE relocation if the type in question is already referenced by a concrete DWARF param or auto record. This cuts down on the amount of work the linker has to do, also makes object files a bit smaller on average (about 1% for the runtime package). Change-Id: I4d24da458d0658edf90c5dca0bf21d5ddc3961d8 Reviewed-on: https://go-review.googlesource.com/c/go/+/234837 TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com> Reviewed-by: Jeremy Faller <jeremy@golang.org> Run-TryBot: Cherry Zhang <cherryyz@google.com> |
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The Go Programming Language
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