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cmd/compile: emit DWARF info about dictionary entries

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When emitting the DIE of the instantiation of a generic function also
emit one DW_TAG_typedef_type entry for each dictionary entry in use,
referencing the shape type and having a custom attribute containing the
index inside the dictionary.

When emitting the DIE of variables that have an instantiated parametric
type, instead of referencing the shape type directly go through the
DW_TAG_typedef_type entry emitted for the dictionary entry describing
the real type of the variable.

Change-Id: Ia45d157ecd4c25e2b60300469e43bbb27a663582
Reviewed-on: https://go-review.googlesource.com/c/go/+/344929
Run-TryBot: Alessandro Arzilli <alessandro.arzilli@gmail.com>
Run-TryBot: Dan Scales <danscales@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Trust: Dan Scales <danscales@google.com>
Trust: Jeremy Faller <jeremy@golang.org>
This commit is contained in:
Alessandro Arzilli 2021-08-25 10:08:07 +02:00 • committed by Than McIntosh
parent 5b48fca1fa
commit 72bb8185b5
5 changed files with 168 additions and 5 deletions
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3
src/cmd/compile/internal/dwarfgen/dwarf.go
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@ -217,6 +217,7 @@ func createDwarfVars(fnsym *obj.LSym, complexOK bool, fn *ir.Func, apDecls []*ir
DeclCol: declpos.RelCol(),
InlIndex: int32(inlIndex),
ChildIndex: -1,
DictIndex: n.DictIndex,
})
// Record go type of to insure that it gets emitted by the linker.
fnsym.Func().RecordAutoType(reflectdata.TypeLinksym(n.Type()))
@ -374,6 +375,7 @@ func createSimpleVar(fnsym *obj.LSym, n *ir.Name) *dwarf.Var {
DeclCol: declpos.RelCol(),
InlIndex: int32(inlIndex),
ChildIndex: -1,
DictIndex: n.DictIndex,
}
}
@ -478,6 +480,7 @@ func createComplexVar(fnsym *obj.LSym, fn *ir.Func, varID ssa.VarID) *dwarf.Var
DeclCol: declpos.RelCol(),
InlIndex: int32(inlIndex),
ChildIndex: -1,
DictIndex: n.DictIndex,
}
list := debug.LocationLists[varID]
if len(list) != 0 {