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cmd/compile,cmd/link: hooks for identifying coverage counters

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Add a new "coverage counter" classification for variables to be used
for storing code coverage counter values (somewhat in the same way
that we identify fuzzer counters). Tagging such variables allows us to
aggregate them in the linker, and to treat updates specially.

Updates #51430.

Change-Id: Ib49fb05736ffece98bcc2f7a7c37e991b7f67bbb
Reviewed-on: https://go-review.googlesource.com/c/go/+/401235
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Than McIntosh 2022-04-19 19:41:40 -04:00
parent 361f5eba9f
commit 072c7d4969
11 changed files with 92 additions and 27 deletions
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46
src/cmd/link/internal/sym/symkind_string.go
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@ -45,31 +45,33 @@ func _() {
_ = x[SBSS-34]
_ = x[SNOPTRBSS-35]
_ = x[SLIBFUZZER_8BIT_COUNTER-36]
_ = x[STLSBSS-37]
_ = x[SXREF-38]
_ = x[SMACHOSYMSTR-39]
_ = x[SMACHOSYMTAB-40]
_ = x[SMACHOINDIRECTPLT-41]
_ = x[SMACHOINDIRECTGOT-42]
_ = x[SFILEPATH-43]
_ = x[SDYNIMPORT-44]
_ = x[SHOSTOBJ-45]
_ = x[SUNDEFEXT-46]
_ = x[SDWARFSECT-47]
_ = x[SDWARFCUINFO-48]
_ = x[SDWARFCONST-49]
_ = x[SDWARFFCN-50]
_ = x[SDWARFABSFCN-51]
_ = x[SDWARFTYPE-52]
_ = x[SDWARFVAR-53]
_ = x[SDWARFRANGE-54]
_ = x[SDWARFLOC-55]
_ = x[SDWARFLINES-56]
_ = x[SCOVERAGE_COUNTER-37]
_ = x[SCOVERAGE_AUXVAR-38]
_ = x[STLSBSS-39]
_ = x[SXREF-40]
_ = x[SMACHOSYMSTR-41]
_ = x[SMACHOSYMTAB-42]
_ = x[SMACHOINDIRECTPLT-43]
_ = x[SMACHOINDIRECTGOT-44]
_ = x[SFILEPATH-45]
_ = x[SDYNIMPORT-46]
_ = x[SHOSTOBJ-47]
_ = x[SUNDEFEXT-48]
_ = x[SDWARFSECT-49]
_ = x[SDWARFCUINFO-50]
_ = x[SDWARFCONST-51]
_ = x[SDWARFFCN-52]
_ = x[SDWARFABSFCN-53]
_ = x[SDWARFTYPE-54]
_ = x[SDWARFVAR-55]
_ = x[SDWARFRANGE-56]
_ = x[SDWARFLOC-57]
_ = x[SDWARFLINES-58]
}
const _SymKind_name = "SxxxSTEXTSELFRXSECTSMACHOPLTSTYPESSTRINGSGOSTRINGSGOFUNCSGCBITSSRODATASFUNCTABSELFROSECTSTYPERELROSSTRINGRELROSGOSTRINGRELROSGOFUNCRELROSGCBITSRELROSRODATARELROSFUNCTABRELROSTYPELINKSITABLINKSSYMTABSPCLNTABSFirstWritableSBUILDINFOSELFSECTSMACHOSMACHOGOTSWINDOWSSELFGOTSNOPTRDATASINITARRSDATASXCOFFTOCSBSSSNOPTRBSSSLIBFUZZER_8BIT_COUNTERSTLSBSSSXREFSMACHOSYMSTRSMACHOSYMTABSMACHOINDIRECTPLTSMACHOINDIRECTGOTSFILEPATHSDYNIMPORTSHOSTOBJSUNDEFEXTSDWARFSECTSDWARFCUINFOSDWARFCONSTSDWARFFCNSDWARFABSFCNSDWARFTYPESDWARFVARSDWARFRANGESDWARFLOCSDWARFLINES"
const _SymKind_name = "SxxxSTEXTSELFRXSECTSMACHOPLTSTYPESSTRINGSGOSTRINGSGOFUNCSGCBITSSRODATASFUNCTABSELFROSECTSTYPERELROSSTRINGRELROSGOSTRINGRELROSGOFUNCRELROSGCBITSRELROSRODATARELROSFUNCTABRELROSTYPELINKSITABLINKSSYMTABSPCLNTABSFirstWritableSBUILDINFOSELFSECTSMACHOSMACHOGOTSWINDOWSSELFGOTSNOPTRDATASINITARRSDATASXCOFFTOCSBSSSNOPTRBSSSLIBFUZZER_8BIT_COUNTERSCOVERAGE_COUNTERSCOVERAGE_AUXVARSTLSBSSSXREFSMACHOSYMSTRSMACHOSYMTABSMACHOINDIRECTPLTSMACHOINDIRECTGOTSFILEPATHSDYNIMPORTSHOSTOBJSUNDEFEXTSDWARFSECTSDWARFCUINFOSDWARFCONSTSDWARFFCNSDWARFABSFCNSDWARFTYPESDWARFVARSDWARFRANGESDWARFLOCSDWARFLINES"
var _SymKind_index = [...]uint16{0, 4, 9, 19, 28, 33, 40, 49, 56, 63, 70, 78, 88, 98, 110, 124, 136, 148, 160, 173, 182, 191, 198, 206, 220, 230, 238, 244, 253, 261, 268, 278, 286, 291, 300, 304, 313, 336, 343, 348, 360, 372, 389, 406, 415, 425, 433, 442, 452, 464, 475, 484, 496, 506, 515, 526, 535, 546}
var _SymKind_index = [...]uint16{0, 4, 9, 19, 28, 33, 40, 49, 56, 63, 70, 78, 88, 98, 110, 124, 136, 148, 160, 173, 182, 191, 198, 206, 220, 230, 238, 244, 253, 261, 268, 278, 286, 291, 300, 304, 313, 336, 353, 369, 376, 381, 393, 405, 422, 439, 448, 458, 466, 475, 485, 497, 508, 517, 529, 539, 548, 559, 568, 579}
func (i SymKind) String() string {
if i >= SymKind(len(_SymKind_index)-1) {