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[dev.typeparams] cmd/compile: implement generic .(T) operations

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Introduce new dynamic dottype operations which take a dynamic
instead of static type to convert to.

Change-Id: I5824a1fea056fe811b1226ce059e1e8da1baa335
Reviewed-on: https://go-review.googlesource.com/c/go/+/337609
Trust: Keith Randall <khr@golang.org>
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>
This commit is contained in:
Keith Randall 2021-07-26 17:41:02 -07:00
parent 4a47e40a14
commit f4f503e0a3
11 changed files with 209 additions and 53 deletions
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4
src/cmd/compile/internal/escape/expr.go
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@ -74,6 +74,10 @@ func (e *escape) exprSkipInit(k hole, n ir.Node) {
case ir.ODOTTYPE, ir.ODOTTYPE2:
n := n.(*ir.TypeAssertExpr)
e.expr(k.dotType(n.Type(), n, "dot"), n.X)
case ir.ODYNAMICDOTTYPE, ir.ODYNAMICDOTTYPE2:
n := n.(*ir.DynamicTypeAssertExpr)
e.expr(k.dotType(n.Type(), n, "dot"), n.X)
// n.T doesn't need to be tracked; it always points to read-only storage.
case ir.OINDEX:
n := n.(*ir.IndexExpr)
if n.X.Type().IsArray() {