Zir: store extra source hashes required for incremental

Also add corresponding invaidation logic to Zcu. Therefore, the only
invalidation logic which is not yet in place is `decl_val` dependencies.

1 files changed, 12 insertions, 0 deletions

diff --git a/src/Module.zig b/src/Module.zig
index d6ee0485ce..93b5066192 100644
--- a/src/Module.zig
+++ b/src/Module.zig
@@ -2957,6 +2957,18 @@ fn updateZirRefs(zcu: *Module, file: *File, old_zir: Zir) !void {
             continue;
         };
 
+        if (old_zir.getAssociatedSrcHash(old_inst)) |old_hash| hash_changed: {
+            if (new_zir.getAssociatedSrcHash(ti.inst)) |new_hash| {
+                if (std.zig.srcHashEql(old_hash, new_hash)) {
+                    break :hash_changed;
+                }
+            }
+            // The source hash associated with this instruction changed - invalidate relevant dependencies.
+            zcu.comp.mutex.lock();
+            defer zcu.comp.mutex.unlock();
+            try zcu.markDependeeOutdated(.{ .src_hash = ti_idx });
+        }
+
         // If this is a `struct_decl` etc, we must invalidate any outdated namespace dependencies.
         const has_namespace = switch (old_tag[@intFromEnum(old_inst)]) {
             .extended => switch (old_data[@intFromEnum(old_inst)].extended.opcode) {