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[dev.typeparams] cmd/compile: cache mapped types during irgen

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If we see the exact same types2.Type a second time, we can map it to
the same *types.Type instance. Not strictly necessary, but reduces
memory usage and plays better with the rest of the compiler given the
current state of things.

Change-Id: I53686d072c7c7834b0c97417bc8d5f2cd24572b2
Reviewed-on: https://go-review.googlesource.com/c/go/+/284692
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
This commit is contained in:
Matthew Dempsky 2021-01-19 10:38:33 -08:00
parent 3c0a39c964
commit 90bfc73071
2 changed files with 16 additions and 0 deletions
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2
src/cmd/compile/internal/noder/irgen.go
View File

@ -79,6 +79,7 @@ func check2(noders []*noder) {
info: &info,
posMap: m,
objs: make(map[types2.Object]*ir.Name),
typs: make(map[types2.Type]*types.Type),
}
g.generate(noders)
@ -94,6 +95,7 @@ type irgen struct {
posMap
objs map[types2.Object]*ir.Name
typs map[types2.Type]*types.Type
marker dwarfgen.ScopeMarker
}

14
src/cmd/compile/internal/noder/types.go
View File

@ -26,6 +26,20 @@ func (g *irgen) pkg(pkg *types2.Package) *types.Pkg {
}
func (g *irgen) typ(typ types2.Type) *types.Type {
// Caching type mappings isn't strictly needed, because typ0 preserves
// type identity; but caching minimizes memory blow-up from mapping the
// same composite type multiple times, and also plays better with the
// current state of cmd/compile (e.g., haphazard calculation of type
// sizes).
res, ok := g.typs[typ]
if !ok {
res = g.typ0(typ)
g.typs[typ] = res
}
return res
}
func (g *irgen) typ0(typ types2.Type) *types.Type {
switch typ := typ.(type) {
case *types2.Basic:
return g.basic(typ)