Obtain the namespace hierarchy from IR
The `cc_import!` macro is supposed to merge namespaces (== rust modules) across targets. For that, Crubit needs to emit a (JSON) file with the namespace hierarchy for each target.
This cl introduces the mechanism for obtaining the namespace hierarchy.
PiperOrigin-RevId: 471473231
diff --git a/rs_bindings_from_cc/BUILD b/rs_bindings_from_cc/BUILD
index 49ab94b..f6c2490 100644
--- a/rs_bindings_from_cc/BUILD
+++ b/rs_bindings_from_cc/BUILD
@@ -537,3 +537,32 @@
"@crate_index//:quote",
],
)
+
+cc_library(
+ name = "collect_namespaces",
+ srcs = ["collect_namespaces.cc"],
+ hdrs = ["collect_namespaces.h"],
+ visibility = ["//:__subpackages__"],
+ deps = [
+ ":cc_ir",
+ "@absl//absl/container:btree",
+ "@absl//absl/container:flat_hash_map",
+ "@absl//absl/strings",
+ "@llvm-project//llvm:Support",
+ ],
+)
+
+cc_test(
+ name = "collect_namespaces_test",
+ srcs = ["collect_namespaces_test.cc"],
+ deps = [
+ ":cc_ir",
+ ":collect_namespaces",
+ ":ir_from_cc",
+ "@absl//absl/status",
+ "@absl//absl/status:statusor",
+ "@absl//absl/strings",
+ "@absl//absl/types:span",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
