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[dev.regabi] cmd/compile: initialize importMap lazily
This sets up the next CL, moving importMap to a global zeroed struct. Change-Id: I1acc91b440d3da6e28fb32bd275fb3cd36db4e97 Reviewed-on: https://go-review.googlesource.com/c/go/+/272046 Trust: Russ Cox <rsc@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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@ -877,11 +877,14 @@ func writebench(filename string) error {
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}
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var (
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importMap = map[string]string{}
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importMap map[string]string
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packageFile map[string]string // nil means not in use
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)
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func addImportMap(s string) {
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if importMap == nil {
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importMap = make(map[string]string)
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}
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if strings.Count(s, "=") != 1 {
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log.Fatal("-importmap argument must be of the form source=actual")
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}
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@ -894,6 +897,9 @@ func addImportMap(s string) {
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}
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func readImportCfg(file string) {
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if importMap == nil {
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importMap = make(map[string]string)
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}
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packageFile = map[string]string{}
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data, err := ioutil.ReadFile(file)
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if err != nil {
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