sm

src/ir/interp.zig

@@ -106,6 +106,18 @@ pub const InterpError = error{
     Unreachable,
 };
 
+// ── BuildConfig ─────────────────────────────────────────────────────────
+// Mutable build configuration accumulated by #run blocks via BuildOptions methods.
+
+pub const BuildConfig = struct {
+    link_flags: std.ArrayList([]const u8) = .empty,
+    output_path: ?[]const u8 = null,
+
+    pub fn deinit(self: *BuildConfig, alloc: Allocator) void {
+        self.link_flags.deinit(alloc);
+    }
+};
+
 // ── Interpreter ─────────────────────────────────────────────────────────
 
 pub const Interpreter = struct {
@@ -121,6 +133,9 @@ pub const Interpreter = struct {
     // Global values: evaluated comptime globals, indexed by GlobalId
     global_values: std.AutoHashMap(u32, Value),
 
+    // Mutable build configuration — set by LLVMEmitter, written by #run blocks
+    build_config: ?*BuildConfig = null,
+
     pub fn init(module: *const Module, alloc: Allocator) Interpreter {
         return .{
             .module = module,
@@ -1242,6 +1257,30 @@ pub const Interpreter = struct {
                 const f = val.asFloat() orelse return error.TypeError;
                 return .{ .value = .{ .float = @floor(f) } };
             },
+            .build_options => {
+                // Returns a void sentinel — the "handle" to BuildConfig
+                return .{ .value = .void_val };
+            },
+            .build_options_add_link_flag => {
+                // args: [opts_handle, flag_string]
+                const str_val = frame.getRef(bi.args[1]);
+                if (str_val.asString(self)) |s| {
+                    if (self.build_config) |bc| {
+                        bc.link_flags.append(self.alloc, self.alloc.dupe(u8, s) catch return error.CannotEvalComptime) catch return error.CannotEvalComptime;
+                    }
+                }
+                return .{ .value = .void_val };
+            },
+            .build_options_set_output_path => {
+                // args: [opts_handle, path_string]
+                const str_val = frame.getRef(bi.args[1]);
+                if (str_val.asString(self)) |s| {
+                    if (self.build_config) |bc| {
+                        bc.output_path = self.alloc.dupe(u8, s) catch return error.CannotEvalComptime;
+                    }
+                }
+                return .{ .value = .void_val };
+            },
             .cast, .type_of, .alloc, .dealloc => {
                 return error.CannotEvalComptime;
             },