compiler: introduce incremental debug server

In a compiler built with debug extensions, pass `--debug-incremental` to
spawn the "incremental debug server". This is a TCP server exposing a
REPL which allows querying a bunch of compiler state, some of which is
stored only when that flag is passed. Eventually, this will probably
move into `std.zig.Server`/`std.zig.Client`, but this is easier to work
with right now. The easiest way to interact with the server is `telnet`.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/Type.zig b/src/Type.zig
index ba64fb633a..b2a4b228d9 100644
--- a/src/Type.zig
+++ b/src/Type.zig
@@ -3797,6 +3797,11 @@ fn resolveStructInner(
         return error.AnalysisFail;
     }
 
+    if (zcu.comp.debugIncremental()) {
+        const info = try zcu.incremental_debug_state.getUnitInfo(gpa, owner);
+        info.last_update_gen = zcu.generation;
+    }
+
     var analysis_arena = std.heap.ArenaAllocator.init(gpa);
     defer analysis_arena.deinit();
 
@@ -3851,6 +3856,11 @@ fn resolveUnionInner(
         return error.AnalysisFail;
     }
 
+    if (zcu.comp.debugIncremental()) {
+        const info = try zcu.incremental_debug_state.getUnitInfo(gpa, owner);
+        info.last_update_gen = zcu.generation;
+    }
+
     var analysis_arena = std.heap.ArenaAllocator.init(gpa);
     defer analysis_arena.deinit();