rustc: Create a crate metadata cache

2 files changed, 16 insertions, 2 deletions

diff --git a/src/comp/driver/rustc.rs b/src/comp/driver/rustc.rs
index f0ce9a95..b91d0914 100644
--- a/src/comp/driver/rustc.rs
+++ b/src/comp/driver/rustc.rs
@@ -9,6 +9,7 @@ import middle.resolve;
 import middle.typeck;
 import util.common;
 
+import std.map.mk_hashmap;
 import std.option;
 import std.option.some;
 import std.option.none;
@@ -112,7 +113,9 @@ impure fn main(vec[str] args) {
                           uint_type = common.ty_u32,
                           float_type = common.ty_f64 );
 
-    auto sess = session.session(target_cfg);
+    auto crate_cache = common.new_int_hash[session.crate_metadata]();
+
+    auto sess = session.session(target_cfg, crate_cache);
     let option.t[str] input_file = none[str];
     let option.t[str] output_file = none[str];
     let vec[str] library_search_paths = vec();
diff --git a/src/comp/driver/session.rs b/src/comp/driver/session.rs
index 95f7466d..7ad83dc1 100644
--- a/src/comp/driver/session.rs
+++ b/src/comp/driver/session.rs
@@ -1,6 +1,7 @@
 import util.common.span;
 import util.common.ty_mach;
 import std._uint;
+import std.map;
 
 tag os {
     os_win32;
@@ -20,7 +21,9 @@ type cfg = rec(os os,
                ty_mach uint_type,
                ty_mach float_type);
 
-obj session(cfg targ) {
+type crate_metadata = vec[u8];
+
+obj session(cfg targ, map.hashmap[int, crate_metadata] crates) {
 
     fn get_targ_cfg() -> cfg {
         ret targ;
@@ -66,6 +69,14 @@ obj session(cfg targ) {
         log #fmt("error: unimplemented %s", msg);
         fail;
     }
+
+    fn get_external_crate(int num) -> crate_metadata {
+        ret crates.get(num);
+    }
+
+    fn set_external_crate(int num, &crate_metadata metadata) {
+        crates.insert(num, metadata);
+    }
 }