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dumpssa.go
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dumpssa.go
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package main
import (
"bufio"
"bytes"
"fmt"
"log"
"os"
"os/exec"
"path/filepath"
"strings"
)
func dumpSSA(platform string, before, after commit, fnname string) {
fmt.Printf("dumping SSA for %v:\n", fnname)
// split fnname into pkg+fnname, if necessary
pkg, fnname := splitPkgFnname(fnname)
if pkg == "" {
log.Fatalf("must specify package for %v", fnname)
}
// make fnname into an easier to deal with filename
filename := strings.ReplaceAll(fnname, "(", "_")
filename = strings.ReplaceAll(filename, ")", "_")
filename = strings.ReplaceAll(filename, ":", "_")
filename = strings.ReplaceAll(filename, "*", ".")
filename = strings.ReplaceAll(filename, "\"", "_")
filename = strings.ReplaceAll(filename, "[", "_")
filename = strings.ReplaceAll(filename, "]", "_")
for _, c := range []commit{before, after} {
cmdgo := filepath.Join(c.dir, "bin", "go")
args := []string{"build"}
if pkg != "" {
args = append(args, pkg)
} else {
args = append(args, "std", "cmd")
}
cmd := exec.Command(cmdgo, args...)
goos, goarch := parsePlatform(platform)
cmd.Env = append(os.Environ(), "GOOS="+goos, "GOARCH="+goarch, "GOSSAFUNC="+fnname)
cmd.Dir = filepath.Join(c.dir, "src")
out, err := cmd.CombinedOutput()
if err != nil {
fmt.Printf("%v:\n%s\n", cmd, out)
log.Fatal(err)
}
scan := bufio.NewScanner(bytes.NewReader(out))
for scan.Scan() {
s := scan.Text()
if len(s) == 0 {
continue
}
const dumpedSSATo = "dumped SSA to "
if strings.HasPrefix(s, dumpedSSATo) {
path := s[len(dumpedSSATo):]
if !strings.HasSuffix(path, "ssa.html") {
panic("wrote ssa to non-ssa.html file")
}
if !filepath.IsAbs(path) {
path = filepath.Join(c.dir, "src", path)
}
src := path
prefix := ""
if platform != "" {
prefix = fmt.Sprintf("%s_%s_", goos, goarch)
}
dst := strings.TrimSuffix(path, "ssa.html") + prefix + filename + ".html"
err = os.Rename(src, dst)
check(err)
fmt.Println(dst)
}
}
check(scan.Err())
}
fmt.Println()
}
func splitPkgFnname(in string) (pkg, fnname string) {
fnname = in
if slash := strings.LastIndex(fnname, "/"); slash >= 0 {
pkg = fnname[:slash]
fnname = fnname[slash:]
}
if !strings.ContainsAny(fnname, "()*") {
if dot := strings.Index(fnname, "."); dot >= 0 {
pkg += fnname[:dot]
fnname = fnname[dot+1:]
}
}
return pkg, fnname
}