Stateify: register types with full package names

This is to avoid conflicts with types that share the same
[short] package and type names, e.g. proc.smapsData exist
in pkg/sentry/fs/proc and pkg/sentry/fsimpl/proc.

Updates #1663

PiperOrigin-RevId: 294485146

tools/defs.bzl

@@ -110,6 +110,8 @@ def go_library(name, srcs, deps = [], imports = [], stateify = True, marshal = F
     """
     all_srcs = srcs
     all_deps = deps
+    dirname, _, _ = native.package_name().rpartition("/")
+    full_pkg = dirname + "/" + name
     if stateify:
         # Only do stateification for non-state packages without manual autogen.
         # First, we need to segregate the input files via the special suffixes,
@@ -120,7 +122,7 @@ def go_library(name, srcs, deps = [], imports = [], stateify = True, marshal = F
                 name = name + suffix + "_state_autogen_with_imports",
                 srcs = srcs,
                 imports = imports,
-                package = name,
+                package = full_pkg,
                 out = name + suffix + "_state_autogen_with_imports.go",
             )
             go_imports(

tools/go_stateify/defs.bzl

@@ -6,7 +6,7 @@ def _go_stateify_impl(ctx):
 
     # Run the stateify command.
     args = ["-output=%s" % output.path]
-    args.append("-pkg=%s" % ctx.attr.package)
+    args.append("-fullpkg=%s" % ctx.attr.package)
     if ctx.attr._statepkg:
         args.append("-statepkg=%s" % ctx.attr._statepkg)
     if ctx.attr.imports:
@@ -43,7 +43,7 @@ for statified types.
             mandatory = False,
         ),
         "package": attr.string(
-            doc = "The package name for the input sources.",
+            doc = "The fully qualified package name for the input sources.",
             mandatory = True,
         ),
         "out": attr.output(

tools/go_stateify/main.go

@@ -23,6 +23,7 @@ import (
 	"go/parser"
 	"go/token"
 	"os"
+	"path/filepath"
 	"reflect"
 	"strings"
 	"sync"
@@ -31,7 +32,7 @@ import (
 )
 
 var (
-	pkg      = flag.String("pkg", "", "output package")
+	fullPkg  = flag.String("fullpkg", "", "fully qualified output package")
 	imports  = flag.String("imports", "", "extra imports for the output file")
 	output   = flag.String("output", "", "output file")
 	statePkg = flag.String("statepkg", "", "state import package; defaults to empty")
@@ -170,7 +171,7 @@ func main() {
 		flag.Usage()
 		os.Exit(1)
 	}
-	if *pkg == "" {
+	if *fullPkg == "" {
 		fmt.Fprintf(os.Stderr, "Error: package required.")
 		os.Exit(1)
 	}
@@ -202,7 +203,7 @@ func main() {
 
 	// Declare our emission closures.
 	emitRegister := func(name string) {
-		initCalls = append(initCalls, fmt.Sprintf("%sRegister(\"%s.%s\", (*%s)(nil), state.Fns{Save: (*%s).save, Load: (*%s).load})", statePrefix, *pkg, name, name, name, name))
+		initCalls = append(initCalls, fmt.Sprintf("%sRegister(\"%s.%s\", (*%s)(nil), state.Fns{Save: (*%s).save, Load: (*%s).load})", statePrefix, *fullPkg, name, name, name, name))
 	}
 	emitZeroCheck := func(name string) {
 		fmt.Fprintf(outputFile, "	if !%sIsZeroValue(x.%s) { m.Failf(\"%s is %%v, expected zero\", x.%s) }\n", statePrefix, name, name, name)
@@ -233,7 +234,8 @@ func main() {
 	}
 
 	// Emit the package name.
-	fmt.Fprintf(outputFile, "package %s\n\n", *pkg)
+	_, pkg := filepath.Split(*fullPkg)
+	fmt.Fprintf(outputFile, "package %s\n\n", pkg)
 
 	// Emit the imports lazily.
 	var once sync.Once