cmd/go: drop unnecessary Package argument to reportCmd

Now that we've dropped the redundant Package arguments to many
functions, we can see that the Package argument to reportCmd is always
nil. That means we can drop it and always use a.Package.

For #62067.

Change-Id: I2e11e770f495d6f770047993358c76b08204e923
Reviewed-on: https://go-review.googlesource.com/c/go/+/536096
Auto-Submit: Austin Clements <[email protected]>
Reviewed-by: Bryan Mills <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>

Author: aclements

src/cmd/go/internal/work/cover.go

@@ -72,7 +72,7 @@ func WriteCoveragePercent(b *Builder, runAct *Action, mf string, w io.Writer) er
 	dir := filepath.Dir(mf)
 	output, cerr := b.CovData(runAct, "percent", "-i", dir)
 	if cerr != nil {
-		return b.reportCmd(runAct, nil, "", "", output, cerr)
+		return b.reportCmd(runAct, "", "", output, cerr)
 	}
 	_, werr := w.Write(output)
 	return werr
@@ -87,7 +87,7 @@ func WriteCoverageProfile(b *Builder, runAct *Action, mf, outf string, w io.Writ
 	dir := filepath.Dir(mf)
 	output, err := b.CovData(runAct, "textfmt", "-i", dir, "-o", outf)
 	if err != nil {
-		return b.reportCmd(runAct, nil, "", "", output, err)
+		return b.reportCmd(runAct, "", "", output, err)
 	}
 	_, werr := w.Write(output)
 	return werr

src/cmd/go/internal/work/exec.go

@@ -868,7 +868,7 @@ OverlayLoop:
 	// Compile Go.
 	objpkg := objdir + "_pkg_.a"
 	ofile, out, err := BuildToolchain.gc(b, a, objpkg, icfg.Bytes(), embedcfg, symabis, len(sfiles) > 0, gofiles)
-	if err := b.reportCmd(a, nil, "", "", out, err); err != nil {
+	if err := b.reportCmd(a, "", "", out, err); err != nil {
 		return err
 	}
 	if ofile != objpkg {
@@ -996,7 +996,7 @@ func (b *Builder) checkDirectives(a *Action) error {
 		// path, but the content of the error doesn't matter because msg is
 		// non-empty.
 		err := errors.New("invalid directive")
-		return b.reportCmd(a, nil, "", "", msg.Bytes(), err)
+		return b.reportCmd(a, "", "", msg.Bytes(), err)
 	}
 	return nil
 }
@@ -1637,7 +1637,7 @@ func (b *Builder) getPkgConfigFlags(a *Action) (cflags, ldflags []string, err er
 		out, err = b.runOut(nil, p.Dir, nil, b.PkgconfigCmd(), "--cflags", pcflags, "--", pkgs)
 		if err != nil {
 			desc := b.PkgconfigCmd() + " --cflags " + strings.Join(pcflags, " ") + " -- " + strings.Join(pkgs, " ")
-			return nil, nil, b.reportCmd(a, nil, desc, "", out, err)
+			return nil, nil, b.reportCmd(a, desc, "", out, err)
 		}
 		if len(out) > 0 {
 			cflags, err = splitPkgConfigOutput(bytes.TrimSpace(out))
@@ -1651,7 +1651,7 @@ func (b *Builder) getPkgConfigFlags(a *Action) (cflags, ldflags []string, err er
 		out, err = b.runOut(nil, p.Dir, nil, b.PkgconfigCmd(), "--libs", pcflags, "--", pkgs)
 		if err != nil {
 			desc := b.PkgconfigCmd() + " --libs " + strings.Join(pcflags, " ") + " -- " + strings.Join(pkgs, " ")
-			return nil, nil, b.reportCmd(a, nil, desc, "", out, err)
+			return nil, nil, b.reportCmd(a, desc, "", out, err)
 		}
 		if len(out) > 0 {
 			// We need to handle path with spaces so that C:/Program\ Files can pass
@@ -2241,16 +2241,10 @@ func (b *Builder) Showcmd(dir string, format string, args ...any) {
 // cgo file paths with the original file path, and replaces cgo-mangled names
 // with "C.name".
 //
-// p is optional. If nil, a.Package is used.
+// desc is optional. If "", a.Package.Desc() is used.
 //
-// desc is optional. If "", p.Desc() is used.
-//
-// dir is optional. If "", p.Dir is used.
-func (b *Builder) reportCmd(a *Action, p *load.Package, desc, dir string, cmdOut []byte, cmdErr error) error {
-	// TODO: It seems we can always get p from a.Package, so it should be
-	// possible to drop the "p" argument. However, a lot of callers take both
-	// Action and Package, so we'd want to drop the Package argument from those,
-	// too.
+// dir is optional. If "", a.Package.Dir is used.
+func (b *Builder) reportCmd(a *Action, desc, dir string, cmdOut []byte, cmdErr error) error {
 	if len(cmdOut) == 0 && cmdErr == nil {
 		// Common case
 		return nil
@@ -2267,7 +2261,8 @@ func (b *Builder) reportCmd(a *Action, p *load.Package, desc, dir string, cmdOut
 	}
 
 	// Fetch defaults from the package.
-	if a != nil && p == nil {
+	var p *load.Package
+	if a != nil {
 		p = a.Package
 	}
 	var importPath string
@@ -2397,7 +2392,7 @@ func (b *Builder) run(a *Action, dir string, desc string, env []string, cmdargs
 	if desc == "" {
 		desc = b.fmtcmd(dir, "%s", strings.Join(str.StringList(cmdargs...), " "))
 	}
-	return b.reportCmd(a, nil, desc, dir, out, err)
+	return b.reportCmd(a, desc, dir, out, err)
 }
 
 // runOut runs the command given by cmdline in the directory dir.
@@ -2759,7 +2754,7 @@ func (b *Builder) ccompile(a *Action, outfile string, flags []string, file strin
 		err = errors.New("warning promoted to error")
 	}
 
-	return b.reportCmd(a, nil, "", "", output, err)
+	return b.reportCmd(a, "", "", output, err)
 }
 
 // gccld runs the gcc linker to create an executable from a set of object files.
@@ -2813,7 +2808,7 @@ func (b *Builder) gccld(a *Action, objdir, outfile string, flags []string, objs
 	// Note that failure is an expected outcome here, so we report output only
 	// in debug mode and don't report the error.
 	if cfg.BuildN || cfg.BuildX {
-		b.reportCmd(a, nil, "", "", out, nil)
+		b.reportCmd(a, "", "", out, nil)
 	}
 	return err
 }
@@ -3848,7 +3843,7 @@ func (b *Builder) swigOne(a *Action, file, objdir string, pcCFLAGS []string, cxx
 	if err != nil && (bytes.Contains(out, []byte("-intgosize")) || bytes.Contains(out, []byte("-cgo"))) {
 		return "", "", errors.New("must have SWIG version >= 3.0.6")
 	}
-	if err := b.reportCmd(a, nil, "", "", out, err); err != nil {
+	if err := b.reportCmd(a, "", "", out, err); err != nil {
 		return "", "", err
 	}
 

src/cmd/go/internal/work/gc.go

@@ -464,7 +464,7 @@ func (gcToolchain) pack(b *Builder, a *Action, afile string, ofiles []string) er
 		return nil
 	}
 	if err := packInternal(absAfile, absOfiles); err != nil {
-		return b.reportCmd(a, nil, "", "", nil, err)
+		return b.reportCmd(a, "", "", nil, err)
 	}
 	return nil
 }

src/cmd/go/internal/work/gccgo.go

@@ -245,7 +245,7 @@ func (tools gccgoToolchain) pack(b *Builder, a *Action, afile string, ofiles []s
 	}
 
 	// Show the output if there is any even without errors.
-	return b.reportCmd(a, nil, "", "", output, nil)
+	return b.reportCmd(a, "", "", output, nil)
 }
 
 func (tools gccgoToolchain) link(b *Builder, root *Action, out, importcfg string, allactions []*Action, buildmode, desc string) error {
@@ -659,7 +659,7 @@ func (tools gccgoToolchain) supportsCgoIncomplete(b *Builder, a *Action) bool {
 			// Show output. We always pass a nil err because errors are an
 			// expected outcome in this case.
 			desc := b.fmtcmd(tmpdir, "%s -c -o %s %s", tools.compiler(), on, fn)
-			b.reportCmd(a, nil, desc, tmpdir, buf.Bytes(), nil)
+			b.reportCmd(a, desc, tmpdir, buf.Bytes(), nil)
 		}
 	})
 	return gccgoSupportsCgoIncomplete