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net/http/cgi: replace constant map with switch statement

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The switch statement can be statically optimized by the compiler,
whereas similarly optimizing the map index expression would require
additional compiler analysis to detect the map is never mutated.

Updates #10848.

Change-Id: I2fc70d4a34dc545677b99f218b51023c7891bbbd
Reviewed-on: https://go-review.googlesource.com/c/go/+/231041
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Matthew Dempsky 2020-04-29 16:45:05 -07:00
parent a7e539619e
commit 844b410922
1 changed files with 18 additions and 11 deletions
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29
src/net/http/cgi/host.go
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@ -32,16 +32,23 @@ import (
var trailingPort = regexp.MustCompile(`:([0-9]+)$`)
var osDefaultInheritEnv = map[string][]string{
"darwin": {"DYLD_LIBRARY_PATH"},
"freebsd": {"LD_LIBRARY_PATH"},
"hpux": {"LD_LIBRARY_PATH", "SHLIB_PATH"},
"irix": {"LD_LIBRARY_PATH", "LD_LIBRARYN32_PATH", "LD_LIBRARY64_PATH"},
"linux": {"LD_LIBRARY_PATH"},
"openbsd": {"LD_LIBRARY_PATH"},
"solaris": {"LD_LIBRARY_PATH", "LD_LIBRARY_PATH_32", "LD_LIBRARY_PATH_64"},
"windows": {"SystemRoot", "COMSPEC", "PATHEXT", "WINDIR"},
}
var osDefaultInheritEnv = func() []string {
switch runtime.GOOS {
case "darwin":
return []string{"DYLD_LIBRARY_PATH"}
case "linux", "freebsd", "openbsd":
return []string{"LD_LIBRARY_PATH"}
case "hpux":
return []string{"LD_LIBRARY_PATH", "SHLIB_PATH"}
case "irix":
return []string{"LD_LIBRARY_PATH", "LD_LIBRARYN32_PATH", "LD_LIBRARY64_PATH"}
case "solaris":
return []string{"LD_LIBRARY_PATH", "LD_LIBRARY_PATH_32", "LD_LIBRARY_PATH_64"}
case "windows":
return []string{"SystemRoot", "COMSPEC", "PATHEXT", "WINDIR"}
}
return nil
}()
// Handler runs an executable in a subprocess with a CGI environment.
type Handler struct {
@ -183,7 +190,7 @@ func (h *Handler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
}
}
for _, e := range osDefaultInheritEnv[runtime.GOOS] {
for _, e := range osDefaultInheritEnv {
if v := os.Getenv(e); v != "" {
env = append(env, e+"="+v)
}