cmd/compile: extend profiling-per-package-into-directory to other pro…

…filing flags

Also allow specification of "directory" with a trailing
path separator on the name.  Updated suffix ".mprof" to ".memprof",
others are similarly disambiguated.

Change-Id: I2f3f44a436893730dbfe70b6815dff1e74885404
Reviewed-on: https://go-review.googlesource.com/c/go/+/542715
Run-TryBot: David Chase <[email protected]>
Reviewed-by: Matthew Dempsky <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>

src/cmd/compile/internal/gc/util.go

@@ -11,13 +11,28 @@ import (
 	"runtime"
 	"runtime/pprof"
 	tracepkg "runtime/trace"
+	"strings"
 
 	"cmd/compile/internal/base"
 )
 
+func profileName(fn, suffix string) string {
+	if strings.HasSuffix(fn, string(os.PathSeparator)) {
+		err := os.MkdirAll(fn, 0755)
+		if err != nil {
+			base.Fatalf("%v", err)
+		}
+	}
+	if fi, statErr := os.Stat(fn); statErr == nil && fi.IsDir() {
+		fn = filepath.Join(fn, url.PathEscape(base.Ctxt.Pkgpath)+suffix)
+	}
+	return fn
+}
+
 func startProfile() {
 	if base.Flag.CPUProfile != "" {
-		f, err := os.Create(base.Flag.CPUProfile)
+		fn := profileName(base.Flag.CPUProfile, ".cpuprof")
+		f, err := os.Create(fn)
 		if err != nil {
 			base.Fatalf("%v", err)
 		}
@@ -40,8 +55,14 @@ func startProfile() {
 		// gzipFormat is what most people want, otherwise
 		var format = textFormat
 		fn := base.Flag.MemProfile
+		if strings.HasSuffix(fn, string(os.PathSeparator)) {
+			err := os.MkdirAll(fn, 0755)
+			if err != nil {
+				base.Fatalf("%v", err)
+			}
+		}
 		if fi, statErr := os.Stat(fn); statErr == nil && fi.IsDir() {
-			fn = filepath.Join(fn, url.PathEscape(base.Ctxt.Pkgpath)+".mprof")
+			fn = filepath.Join(fn, url.PathEscape(base.Ctxt.Pkgpath)+".memprof")
 			format = gzipFormat
 		}
 
@@ -62,7 +83,7 @@ func startProfile() {
 		runtime.MemProfileRate = 0
 	}
 	if base.Flag.BlockProfile != "" {
-		f, err := os.Create(base.Flag.BlockProfile)
+		f, err := os.Create(profileName(base.Flag.BlockProfile, ".blockprof"))
 		if err != nil {
 			base.Fatalf("%v", err)
 		}
@@ -73,7 +94,7 @@ func startProfile() {
 		})
 	}
 	if base.Flag.MutexProfile != "" {
-		f, err := os.Create(base.Flag.MutexProfile)
+		f, err := os.Create(profileName(base.Flag.MutexProfile, ".mutexprof"))
 		if err != nil {
 			base.Fatalf("%v", err)
 		}
@@ -84,7 +105,7 @@ func startProfile() {
 		})
 	}
 	if base.Flag.TraceProfile != "" {
-		f, err := os.Create(base.Flag.TraceProfile)
+		f, err := os.Create(profileName(base.Flag.TraceProfile, ".trace"))
 		if err != nil {
 			base.Fatalf("%v", err)
 		}