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cmd/compile: wrong DWARF scope for captured variable #21515

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aarzilli opened this issue Aug 18, 2017 · 1 comment
Closed

cmd/compile: wrong DWARF scope for captured variable #21515

aarzilli opened this issue Aug 18, 2017 · 1 comment
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@aarzilli
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Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

go version devel +b73d46d Fri Aug 18 05:29:56 2017 +0000 linux/amd64

What did you do?

Compiled this without optimizations.

What did you expect to see?

b and f in the same lexical block.

What did you see instead?

 <1><2683e>: Abbrev Number: 2 (DW_TAG_subprogram)
    <2683f>   DW_AT_name        : main.makef
    <2684a>   DW_AT_low_pc      : 0x485c30
    <26852>   DW_AT_high_pc     : 0x485dc6
    <2685a>   DW_AT_frame_base  : 1 byte block: 9c      (DW_OP_call_frame_cfa)
    <2685c>   DW_AT_external    : 1
 <2><2685d>: Abbrev Number: 4 (DW_TAG_variable)
    <2685e>   DW_AT_name        : b
    <26860>   DW_AT_location    : 5 byte block: 9c 11 88 7f 22  (DW_OP_call_frame_cfa; DW_OP_consts: -120; DW_OP_plus)
    <26866>   DW_AT_type        : <0x283a6>
 <2><2686a>: Abbrev Number: 4 (DW_TAG_variable)
    <2686b>   DW_AT_name        : a
    <2686d>   DW_AT_location    : 5 byte block: 9c 11 90 7f 22  (DW_OP_call_frame_cfa; DW_OP_consts: -112; DW_OP_plus)
    <26873>   DW_AT_type        : <0x283a6>
 <2><26877>: Abbrev Number: 6 (DW_TAG_formal_parameter)
    <26878>   DW_AT_name        : flag
    <2687d>   DW_AT_location    : 1 byte block: 9c      (DW_OP_call_frame_cfa)
    <2687f>   DW_AT_type        : <0x26b8f>
 <2><26883>: Abbrev Number: 6 (DW_TAG_formal_parameter)
    <26884>   DW_AT_name        : ~r1
    <26888>   DW_AT_location    : 4 byte block: 9c 11 8 22      (DW_OP_call_frame_cfa; DW_OP_consts: 8; DW_OP_plus)
    <2688d>   DW_AT_type        : <0x35ccf>
 <2><26891>: Abbrev Number: 9 (DW_TAG_lexical_block)
    <26892>   DW_AT_low_pc      : 0x485c82
    <2689a>   DW_AT_high_pc     : 0x485ce3
 <3><268a2>: Abbrev Number: 4 (DW_TAG_variable)
    <268a3>   DW_AT_name        : f
    <268a5>   DW_AT_location    : 5 byte block: 9c 11 a0 7f 22  (DW_OP_call_frame_cfa; DW_OP_consts: -96; DW_OP_plus)
    <268ab>   DW_AT_type        : <0x35ccf>
 <3><268af>: Abbrev Number: 0
 <2><268b0>: Abbrev Number: 0
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Change https://golang.org/cl/56830 mentions this issue: cmd/compile: fix lexical block of captured variables

@golang golang locked and limited conversation to collaborators Sep 15, 2018
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@aarzilli @gopherbot @heschi