From c0df70706695a67089d4e691d3d3a0f77b90298f Mon Sep 17 00:00:00 2001
From: mlugg <mlugg@mlugg.co.uk>
Date: Tue, 3 Jun 2025 16:25:16 +0100
Subject: wasm: get self-hosted compiling, and supporting `separate_thread`

My original goal here was just to get the self-hosted Wasm backend
compiling again after the pipeline change, but it turned out that from
there it was pretty simple to entirely eliminate the shared state
between `codegen.wasm` and `link.Wasm`. As such, this commit not only
fixes the backend, but makes it the second backend (after CBE) to
support the new 1:N:1 threading model.
---
 src/codegen.zig | 19 +++----------------
 1 file changed, 3 insertions(+), 16 deletions(-)

(limited to 'src/codegen.zig')

diff --git a/src/codegen.zig b/src/codegen.zig
index ea57aaf89c..5a8f17735a 100644
--- a/src/codegen.zig
+++ b/src/codegen.zig
@@ -123,6 +123,7 @@ pub const AnyMir = union {
             .stage2_riscv64,
             .stage2_sparc64,
             .stage2_x86_64,
+            .stage2_wasm,
             .stage2_c,
             => |backend_ct| @field(mir, tag(backend_ct)).deinit(gpa),
         }
@@ -153,6 +154,7 @@ pub fn generateFunction(
         .stage2_riscv64,
         .stage2_sparc64,
         .stage2_x86_64,
+        .stage2_wasm,
         .stage2_c,
         => |backend| {
             dev.check(devFeatureForBackend(backend));
@@ -784,7 +786,6 @@ fn lowerUavRef(
     const comp = lf.comp;
     const target = &comp.root_mod.resolved_target.result;
     const ptr_width_bytes = @divExact(target.ptrBitWidth(), 8);
-    const is_obj = comp.config.output_mode == .Obj;
     const uav_val = uav.val;
     const uav_ty = Type.fromInterned(ip.typeOf(uav_val));
     const is_fn_body = uav_ty.zigTypeTag(zcu) == .@"fn";
@@ -804,21 +805,7 @@ fn lowerUavRef(
             dev.check(link.File.Tag.wasm.devFeature());
             const wasm = lf.cast(.wasm).?;
             assert(reloc_parent == .none);
-            if (is_obj) {
-                try wasm.out_relocs.append(gpa, .{
-                    .offset = @intCast(code.items.len),
-                    .pointee = .{ .symbol_index = try wasm.uavSymbolIndex(uav.val) },
-                    .tag = if (ptr_width_bytes == 4) .memory_addr_i32 else .memory_addr_i64,
-                    .addend = @intCast(offset),
-                });
-            } else {
-                try wasm.uav_fixups.ensureUnusedCapacity(gpa, 1);
-                wasm.uav_fixups.appendAssumeCapacity(.{
-                    .uavs_exe_index = try wasm.refUavExe(uav.val, uav.orig_ty),
-                    .offset = @intCast(code.items.len),
-                    .addend = @intCast(offset),
-                });
-            }
+            try wasm.addUavReloc(code.items.len, uav.val, uav.orig_ty, @intCast(offset));
             code.appendNTimesAssumeCapacity(0, ptr_width_bytes);
             return;
         },
-- 
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