Commit c6f3e9d79c

mlugg <mlugg@mlugg.co.uk>
2024-03-25 20:02:21
Zcu.Decl: remove `ty` field
`Decl` can no longer store un-interned values, so this field is now unnecessary. The type can instead be fetched with the new `typeOf` helper method, which just gets the type of the Decl's `Value`.
1 parent 341857e
src/arch/aarch64/CodeGen.zig
@@ -342,7 +342,7 @@ pub fn generate(
     const func = zcu.funcInfo(func_index);
     const fn_owner_decl = zcu.declPtr(func.owner_decl);
     assert(fn_owner_decl.has_tv);
-    const fn_type = fn_owner_decl.ty;
+    const fn_type = fn_owner_decl.typeOf(zcu);
     const namespace = zcu.namespacePtr(fn_owner_decl.src_namespace);
     const target = &namespace.file_scope.mod.resolved_target.result;
 
src/arch/arm/CodeGen.zig
@@ -349,7 +349,7 @@ pub fn generate(
     const func = zcu.funcInfo(func_index);
     const fn_owner_decl = zcu.declPtr(func.owner_decl);
     assert(fn_owner_decl.has_tv);
-    const fn_type = fn_owner_decl.ty;
+    const fn_type = fn_owner_decl.typeOf(zcu);
     const namespace = zcu.namespacePtr(fn_owner_decl.src_namespace);
     const target = &namespace.file_scope.mod.resolved_target.result;
 
src/arch/riscv64/CodeGen.zig
@@ -230,7 +230,7 @@ pub fn generate(
     const func = zcu.funcInfo(func_index);
     const fn_owner_decl = zcu.declPtr(func.owner_decl);
     assert(fn_owner_decl.has_tv);
-    const fn_type = fn_owner_decl.ty;
+    const fn_type = fn_owner_decl.typeOf(zcu);
     const namespace = zcu.namespacePtr(fn_owner_decl.src_namespace);
     const target = &namespace.file_scope.mod.resolved_target.result;
 
src/arch/sparc64/CodeGen.zig
@@ -273,7 +273,7 @@ pub fn generate(
     const func = zcu.funcInfo(func_index);
     const fn_owner_decl = zcu.declPtr(func.owner_decl);
     assert(fn_owner_decl.has_tv);
-    const fn_type = fn_owner_decl.ty;
+    const fn_type = fn_owner_decl.typeOf(zcu);
     const namespace = zcu.namespacePtr(fn_owner_decl.src_namespace);
     const target = &namespace.file_scope.mod.resolved_target.result;
 
src/arch/wasm/CodeGen.zig
@@ -1243,12 +1243,12 @@ pub fn generate(
 fn genFunc(func: *CodeGen) InnerError!void {
     const mod = func.bin_file.base.comp.module.?;
     const ip = &mod.intern_pool;
-    const fn_info = mod.typeToFunc(func.decl.ty).?;
+    const fn_info = mod.typeToFunc(func.decl.typeOf(mod)).?;
     var func_type = try genFunctype(func.gpa, fn_info.cc, fn_info.param_types.get(ip), Type.fromInterned(fn_info.return_type), mod);
     defer func_type.deinit(func.gpa);
     _ = try func.bin_file.storeDeclType(func.decl_index, func_type);
 
-    var cc_result = try func.resolveCallingConventionValues(func.decl.ty);
+    var cc_result = try func.resolveCallingConventionValues(func.decl.typeOf(mod));
     defer cc_result.deinit(func.gpa);
 
     func.args = cc_result.args;
@@ -2087,7 +2087,7 @@ fn airRet(func: *CodeGen, inst: Air.Inst.Index) InnerError!void {
     const mod = func.bin_file.base.comp.module.?;
     const un_op = func.air.instructions.items(.data)[@intFromEnum(inst)].un_op;
     const operand = try func.resolveInst(un_op);
-    const fn_info = mod.typeToFunc(func.decl.ty).?;
+    const fn_info = mod.typeToFunc(func.decl.typeOf(mod)).?;
     const ret_ty = Type.fromInterned(fn_info.return_type);
 
     // result must be stored in the stack and we return a pointer
@@ -2135,7 +2135,7 @@ fn airRetPtr(func: *CodeGen, inst: Air.Inst.Index) InnerError!void {
             break :result try func.allocStack(Type.usize); // create pointer to void
         }
 
-        const fn_info = mod.typeToFunc(func.decl.ty).?;
+        const fn_info = mod.typeToFunc(func.decl.typeOf(mod)).?;
         if (firstParamSRet(fn_info.cc, Type.fromInterned(fn_info.return_type), mod)) {
             break :result func.return_value;
         }
@@ -2152,7 +2152,7 @@ fn airRetLoad(func: *CodeGen, inst: Air.Inst.Index) InnerError!void {
     const operand = try func.resolveInst(un_op);
     const ret_ty = func.typeOf(un_op).childType(mod);
 
-    const fn_info = mod.typeToFunc(func.decl.ty).?;
+    const fn_info = mod.typeToFunc(func.decl.typeOf(mod)).?;
     if (!ret_ty.hasRuntimeBitsIgnoreComptime(mod)) {
         if (ret_ty.isError(mod)) {
             try func.addImm32(0);
@@ -2193,7 +2193,7 @@ fn airCall(func: *CodeGen, inst: Air.Inst.Index, modifier: std.builtin.CallModif
             break :blk function.owner_decl;
         } else if (func_val.getExternFunc(mod)) |extern_func| {
             const ext_decl = mod.declPtr(extern_func.decl);
-            const ext_info = mod.typeToFunc(ext_decl.ty).?;
+            const ext_info = mod.typeToFunc(ext_decl.typeOf(mod)).?;
             var func_type = try genFunctype(func.gpa, ext_info.cc, ext_info.param_types.get(ip), Type.fromInterned(ext_info.return_type), mod);
             defer func_type.deinit(func.gpa);
             const atom_index = try func.bin_file.getOrCreateAtomForDecl(extern_func.decl);
@@ -2530,7 +2530,7 @@ fn airArg(func: *CodeGen, inst: Air.Inst.Index) InnerError!void {
     const mod = func.bin_file.base.comp.module.?;
     const arg_index = func.arg_index;
     const arg = func.args[arg_index];
-    const cc = mod.typeToFunc(func.decl.ty).?.cc;
+    const cc = mod.typeToFunc(func.decl.typeOf(mod)).?.cc;
     const arg_ty = func.typeOfIndex(inst);
     if (cc == .C) {
         const arg_classes = abi.classifyType(arg_ty, mod);
@@ -3122,7 +3122,7 @@ fn lowerParentPtrDecl(func: *CodeGen, ptr_val: Value, decl_index: InternPool.Dec
     const mod = func.bin_file.base.comp.module.?;
     const decl = mod.declPtr(decl_index);
     try mod.markDeclAlive(decl);
-    const ptr_ty = try mod.singleMutPtrType(decl.ty);
+    const ptr_ty = try mod.singleMutPtrType(decl.typeOf(mod));
     return func.lowerDeclRefValue(.{ .ty = ptr_ty, .val = ptr_val }, decl_index, offset);
 }
 
@@ -3173,7 +3173,8 @@ fn lowerDeclRefValue(func: *CodeGen, tv: TypedValue, decl_index: InternPool.Decl
             return func.lowerDeclRefValue(tv, func_val.decl, offset);
         }
     }
-    if (decl.ty.zigTypeTag(mod) != .Fn and !decl.ty.hasRuntimeBitsIgnoreComptime(mod)) {
+    const decl_ty = decl.typeOf(mod);
+    if (decl_ty.zigTypeTag(mod) != .Fn and !decl_ty.hasRuntimeBitsIgnoreComptime(mod)) {
         return WValue{ .imm32 = 0xaaaaaaaa };
     }
 
@@ -3182,7 +3183,7 @@ fn lowerDeclRefValue(func: *CodeGen, tv: TypedValue, decl_index: InternPool.Decl
     const atom = func.bin_file.getAtom(atom_index);
 
     const target_sym_index = @intFromEnum(atom.sym_index);
-    if (decl.ty.zigTypeTag(mod) == .Fn) {
+    if (decl_ty.zigTypeTag(mod) == .Fn) {
         return WValue{ .function_index = target_sym_index };
     } else if (offset == 0) {
         return WValue{ .memory = target_sym_index };
src/arch/x86_64/CodeGen.zig
@@ -808,7 +808,7 @@ pub fn generate(
     const func = zcu.funcInfo(func_index);
     const fn_owner_decl = zcu.declPtr(func.owner_decl);
     assert(fn_owner_decl.has_tv);
-    const fn_type = fn_owner_decl.ty;
+    const fn_type = fn_owner_decl.typeOf(zcu);
     const namespace = zcu.namespacePtr(fn_owner_decl.src_namespace);
     const mod = namespace.file_scope.mod;
 
src/codegen/c.zig
@@ -657,7 +657,7 @@ pub const DeclGen = struct {
         assert(decl.has_tv);
 
         // Render an undefined pointer if we have a pointer to a zero-bit or comptime type.
-        if (ty.isPtrAtRuntime(mod) and !decl.ty.isFnOrHasRuntimeBits(mod)) {
+        if (ty.isPtrAtRuntime(mod) and !decl.typeOf(mod).isFnOrHasRuntimeBits(mod)) {
             return dg.writeCValue(writer, .{ .undef = ty });
         }
 
@@ -673,7 +673,7 @@ pub const DeclGen = struct {
         // them).  The analysis until now should ensure that the C function
         // pointers are compatible.  If they are not, then there is a bug
         // somewhere and we should let the C compiler tell us about it.
-        const need_typecast = if (ty.castPtrToFn(mod)) |_| false else !ty.childType(mod).eql(decl.ty, mod);
+        const need_typecast = if (ty.castPtrToFn(mod)) |_| false else !ty.childType(mod).eql(decl.typeOf(mod), mod);
         if (need_typecast) {
             try writer.writeAll("((");
             try dg.renderType(writer, ty);
@@ -1588,9 +1588,10 @@ pub const DeclGen = struct {
         const ip = &mod.intern_pool;
 
         const fn_decl = mod.declPtr(fn_decl_index);
-        const fn_cty_idx = try dg.typeToIndex(fn_decl.ty, kind);
+        const fn_ty = fn_decl.typeOf(mod);
+        const fn_cty_idx = try dg.typeToIndex(fn_ty, kind);
 
-        const fn_info = mod.typeToFunc(fn_decl.ty).?;
+        const fn_info = mod.typeToFunc(fn_ty).?;
         if (fn_info.cc == .Naked) {
             switch (kind) {
                 .forward => try w.writeAll("zig_naked_decl "),
@@ -1971,7 +1972,7 @@ pub const DeclGen = struct {
     ) !void {
         const decl = dg.module.declPtr(decl_index);
         const fwd = dg.fwdDeclWriter();
-        const is_global = variable.is_extern or dg.declIsGlobal(.{ .ty = decl.ty, .val = decl.val });
+        const is_global = variable.is_extern or dg.declIsGlobal(.{ .ty = decl.typeOf(dg.module), .val = decl.val });
         try fwd.writeAll(if (is_global) "zig_extern " else "static ");
         const maybe_exports = dg.module.decl_exports.get(decl_index);
         const export_weak_linkage = if (maybe_exports) |exports|
@@ -1982,7 +1983,7 @@ pub const DeclGen = struct {
         if (variable.is_threadlocal) try fwd.writeAll("zig_threadlocal ");
         try dg.renderTypeAndName(
             fwd,
-            decl.ty,
+            decl.typeOf(dg.module),
             .{ .decl = decl_index },
             CQualifiers.init(.{ .@"const" = variable.is_const }),
             decl.alignment,
@@ -2656,7 +2657,7 @@ fn genExports(o: *Object) !void {
         .anon, .flush => return,
     };
     const decl = mod.declPtr(decl_index);
-    const tv: TypedValue = .{ .ty = decl.ty, .val = Value.fromInterned((try decl.internValue(mod))) };
+    const tv: TypedValue = .{ .ty = decl.typeOf(mod), .val = Value.fromInterned((try decl.internValue(mod))) };
     const fwd = o.dg.fwdDeclWriter();
 
     const exports = mod.decl_exports.get(decl_index) orelse return;
@@ -2687,7 +2688,7 @@ fn genExports(o: *Object) !void {
         const export_name = ip.stringToSlice(@"export".opts.name);
         try o.dg.renderTypeAndName(
             fwd,
-            decl.ty,
+            decl.typeOf(mod),
             .{ .identifier = export_name },
             CQualifiers.init(.{ .@"const" = is_variable_const }),
             decl.alignment,
@@ -2769,7 +2770,7 @@ pub fn genLazyFn(o: *Object, lazy_fn: LazyFnMap.Entry) !void {
         },
         .never_tail, .never_inline => |fn_decl_index| {
             const fn_decl = mod.declPtr(fn_decl_index);
-            const fn_cty = try o.dg.typeToCType(fn_decl.ty, .complete);
+            const fn_cty = try o.dg.typeToCType(fn_decl.typeOf(mod), .complete);
             const fn_info = fn_cty.cast(CType.Payload.Function).?.data;
 
             const fwd_decl_writer = o.dg.fwdDeclWriter();
@@ -2806,7 +2807,7 @@ pub fn genFunc(f: *Function) !void {
     const decl_index = o.dg.pass.decl;
     const decl = mod.declPtr(decl_index);
     const tv: TypedValue = .{
-        .ty = decl.ty,
+        .ty = decl.typeOf(mod),
         .val = decl.val,
     };
 
@@ -2893,7 +2894,7 @@ pub fn genDecl(o: *Object) !void {
     const mod = o.dg.module;
     const decl_index = o.dg.pass.decl;
     const decl = mod.declPtr(decl_index);
-    const tv: TypedValue = .{ .ty = decl.ty, .val = Value.fromInterned((try decl.internValue(mod))) };
+    const tv: TypedValue = .{ .ty = decl.typeOf(mod), .val = Value.fromInterned((try decl.internValue(mod))) };
 
     if (!tv.ty.isFnOrHasRuntimeBitsIgnoreComptime(mod)) return;
     if (tv.val.getExternFunc(mod)) |_| {
@@ -2979,7 +2980,7 @@ pub fn genHeader(dg: *DeclGen) error{ AnalysisFail, OutOfMemory }!void {
     const decl_index = dg.pass.decl;
     const decl = mod.declPtr(decl_index);
     const tv: TypedValue = .{
-        .ty = decl.ty,
+        .ty = decl.typeOf(mod),
         .val = decl.val,
     };
     const writer = dg.fwdDeclWriter();
@@ -7392,7 +7393,7 @@ fn airCVaStart(f: *Function, inst: Air.Inst.Index) !CValue {
     const inst_ty = f.typeOfIndex(inst);
     const decl_index = f.object.dg.pass.decl;
     const decl = mod.declPtr(decl_index);
-    const fn_cty = try f.typeToCType(decl.ty, .complete);
+    const fn_cty = try f.typeToCType(decl.typeOf(mod), .complete);
     const param_len = fn_cty.castTag(.varargs_function).?.data.param_types.len;
 
     const writer = f.object.writer();
src/codegen/llvm.zig
@@ -1384,7 +1384,7 @@ pub const Object = struct {
         const decl = zcu.declPtr(decl_index);
         const namespace = zcu.namespacePtr(decl.src_namespace);
         const owner_mod = namespace.file_scope.mod;
-        const fn_info = zcu.typeToFunc(decl.ty).?;
+        const fn_info = zcu.typeToFunc(decl.typeOf(zcu)).?;
         const target = zcu.getTarget();
         const ip = &zcu.intern_pool;
 
@@ -1659,7 +1659,7 @@ pub const Object = struct {
             const line_number = decl.src_line + 1;
             const is_internal_linkage = decl.val.getExternFunc(zcu) == null and
                 !zcu.decl_exports.contains(decl_index);
-            const debug_decl_type = try o.lowerDebugType(decl.ty);
+            const debug_decl_type = try o.lowerDebugType(decl.typeOf(zcu));
 
             const subprogram = try o.builder.debugSubprogram(
                 file,
@@ -2881,7 +2881,7 @@ pub const Object = struct {
         const decl = zcu.declPtr(decl_index);
         const namespace = zcu.namespacePtr(decl.src_namespace);
         const owner_mod = namespace.file_scope.mod;
-        const zig_fn_type = decl.ty;
+        const zig_fn_type = decl.typeOf(zcu);
         const gop = try o.decl_map.getOrPut(gpa, decl_index);
         if (gop.found_existing) return gop.value_ptr.ptr(&o.builder).kind.function;
 
@@ -3112,7 +3112,7 @@ pub const Object = struct {
             try o.builder.strtabString(mod.intern_pool.stringToSlice(
                 if (is_extern) decl.name else try decl.fullyQualifiedName(mod),
             )),
-            try o.lowerType(decl.ty),
+            try o.lowerType(decl.typeOf(mod)),
             toLlvmGlobalAddressSpace(decl.@"addrspace", mod.getTarget()),
         );
         gop.value_ptr.* = variable_index.ptrConst(&o.builder).global;
@@ -4263,7 +4263,7 @@ pub const Object = struct {
         const mod = o.module;
         const decl = mod.declPtr(decl_index);
         try mod.markDeclAlive(decl);
-        const ptr_ty = try mod.singleMutPtrType(decl.ty);
+        const ptr_ty = try mod.singleMutPtrType(decl.typeOf(mod));
         return o.lowerDeclRefValue(ptr_ty, decl_index);
     }
 
@@ -4450,9 +4450,10 @@ pub const Object = struct {
             }
         }
 
-        const is_fn_body = decl.ty.zigTypeTag(mod) == .Fn;
-        if ((!is_fn_body and !decl.ty.hasRuntimeBits(mod)) or
-            (is_fn_body and mod.typeToFunc(decl.ty).?.is_generic)) return o.lowerPtrToVoid(ty);
+        const decl_ty = decl.typeOf(mod);
+        const is_fn_body = decl_ty.zigTypeTag(mod) == .Fn;
+        if ((!is_fn_body and !decl_ty.hasRuntimeBits(mod)) or
+            (is_fn_body and mod.typeToFunc(decl_ty).?.is_generic)) return o.lowerPtrToVoid(ty);
 
         try mod.markDeclAlive(decl);
 
@@ -4740,7 +4741,7 @@ pub const DeclGen = struct {
                 debug_file, // File
                 debug_file, // Scope
                 line_number,
-                try o.lowerDebugType(decl.ty),
+                try o.lowerDebugType(decl.typeOf(zcu)),
                 variable_index,
                 .{ .local = is_internal_linkage },
             );
@@ -5530,7 +5531,7 @@ pub const FuncGen = struct {
         const mod = o.module;
         const msg_decl_index = mod.panic_messages[@intFromEnum(panic_id)].unwrap().?;
         const msg_decl = mod.declPtr(msg_decl_index);
-        const msg_len = msg_decl.ty.childType(mod).arrayLen(mod);
+        const msg_len = msg_decl.typeOf(mod).childType(mod).arrayLen(mod);
         const msg_ptr = try o.lowerValue(try msg_decl.internValue(mod));
         const null_opt_addr_global = try fg.resolveNullOptUsize();
         const target = mod.getTarget();
@@ -5544,7 +5545,7 @@ pub const FuncGen = struct {
         // )
         const panic_func = mod.funcInfo(mod.panic_func_index);
         const panic_decl = mod.declPtr(panic_func.owner_decl);
-        const fn_info = mod.typeToFunc(panic_decl.ty).?;
+        const fn_info = mod.typeToFunc(panic_decl.typeOf(mod)).?;
         const panic_global = try o.resolveLlvmFunction(panic_func.owner_decl);
         _ = try fg.wip.call(
             .normal,
@@ -5612,7 +5613,7 @@ pub const FuncGen = struct {
             _ = try self.wip.retVoid();
             return .none;
         }
-        const fn_info = mod.typeToFunc(self.dg.decl.ty).?;
+        const fn_info = mod.typeToFunc(self.dg.decl.typeOf(mod)).?;
         if (!ret_ty.hasRuntimeBitsIgnoreComptime(mod)) {
             if (Type.fromInterned(fn_info.return_type).isError(mod)) {
                 // Functions with an empty error set are emitted with an error code
@@ -5674,7 +5675,7 @@ pub const FuncGen = struct {
         const un_op = self.air.instructions.items(.data)[@intFromEnum(inst)].un_op;
         const ptr_ty = self.typeOf(un_op);
         const ret_ty = ptr_ty.childType(mod);
-        const fn_info = mod.typeToFunc(self.dg.decl.ty).?;
+        const fn_info = mod.typeToFunc(self.dg.decl.typeOf(mod)).?;
         if (!ret_ty.hasRuntimeBitsIgnoreComptime(mod)) {
             if (Type.fromInterned(fn_info.return_type).isError(mod)) {
                 // Functions with an empty error set are emitted with an error code
src/codegen/spirv.zig
@@ -1221,7 +1221,7 @@ const DeclGen = struct {
             else => {},
         }
 
-        if (!decl.ty.isFnOrHasRuntimeBitsIgnoreComptime(mod)) {
+        if (!decl.typeOf(mod).isFnOrHasRuntimeBitsIgnoreComptime(mod)) {
             // Pointer to nothing - return undefined.
             return self.spv.constUndef(ty_ref);
         }
@@ -1237,7 +1237,7 @@ const DeclGen = struct {
         const final_storage_class = self.spvStorageClass(decl.@"addrspace");
         try self.addFunctionDep(spv_decl_index, final_storage_class);
 
-        const decl_ptr_ty_ref = try self.ptrType(decl.ty, final_storage_class);
+        const decl_ptr_ty_ref = try self.ptrType(decl.typeOf(mod), final_storage_class);
 
         const ptr_id = switch (final_storage_class) {
             .Generic => try self.castToGeneric(self.typeId(decl_ptr_ty_ref), decl_id),
@@ -2044,11 +2044,11 @@ const DeclGen = struct {
 
         switch (self.spv.declPtr(spv_decl_index).kind) {
             .func => {
-                assert(decl.ty.zigTypeTag(mod) == .Fn);
-                const fn_info = mod.typeToFunc(decl.ty).?;
+                assert(decl.typeOf(mod).zigTypeTag(mod) == .Fn);
+                const fn_info = mod.typeToFunc(decl.typeOf(mod)).?;
                 const return_ty_ref = try self.resolveFnReturnType(Type.fromInterned(fn_info.return_type));
 
-                const prototype_ty_ref = try self.resolveType(decl.ty, .direct);
+                const prototype_ty_ref = try self.resolveType(decl.typeOf(mod), .direct);
                 try self.func.prologue.emit(self.spv.gpa, .OpFunction, .{
                     .id_result_type = self.typeId(return_ty_ref),
                     .id_result = result_id,
@@ -2121,7 +2121,7 @@ const DeclGen = struct {
                 const final_storage_class = self.spvStorageClass(decl.@"addrspace");
                 assert(final_storage_class != .Generic); // These should be instance globals
 
-                const ptr_ty_ref = try self.ptrType(decl.ty, final_storage_class);
+                const ptr_ty_ref = try self.ptrType(decl.typeOf(mod), final_storage_class);
 
                 try self.spv.sections.types_globals_constants.emit(self.spv.gpa, .OpVariable, .{
                     .id_result_type = self.typeId(ptr_ty_ref),
@@ -2144,7 +2144,7 @@ const DeclGen = struct {
 
                 try self.spv.declareDeclDeps(spv_decl_index, &.{});
 
-                const ptr_ty_ref = try self.ptrType(decl.ty, .Function);
+                const ptr_ty_ref = try self.ptrType(decl.typeOf(mod), .Function);
 
                 if (maybe_init_val) |init_val| {
                     // TODO: Combine with resolveAnonDecl?
@@ -2168,7 +2168,7 @@ const DeclGen = struct {
                     });
                     self.current_block_label = root_block_id;
 
-                    const val_id = try self.constant(decl.ty, init_val, .indirect);
+                    const val_id = try self.constant(decl.typeOf(mod), init_val, .indirect);
                     try self.func.body.emit(self.spv.gpa, .OpStore, .{
                         .pointer = result_id,
                         .object = val_id,
@@ -4785,7 +4785,7 @@ const DeclGen = struct {
         const mod = self.module;
         if (!ret_ty.hasRuntimeBitsIgnoreComptime(mod)) {
             const decl = mod.declPtr(self.decl_index);
-            const fn_info = mod.typeToFunc(decl.ty).?;
+            const fn_info = mod.typeToFunc(decl.typeOf(mod)).?;
             if (Type.fromInterned(fn_info.return_type).isError(mod)) {
                 // Functions with an empty error set are emitted with an error code
                 // return type and return zero so they can be function pointers coerced
@@ -4810,7 +4810,7 @@ const DeclGen = struct {
 
         if (!ret_ty.hasRuntimeBitsIgnoreComptime(mod)) {
             const decl = mod.declPtr(self.decl_index);
-            const fn_info = mod.typeToFunc(decl.ty).?;
+            const fn_info = mod.typeToFunc(decl.typeOf(mod)).?;
             if (Type.fromInterned(fn_info.return_type).isError(mod)) {
                 // Functions with an empty error set are emitted with an error code
                 // return type and return zero so they can be function pointers coerced
src/link/Elf/ZigObject.zig
@@ -846,7 +846,7 @@ fn getDeclShdrIndex(
     _ = self;
     const mod = elf_file.base.comp.module.?;
     const any_non_single_threaded = elf_file.base.comp.config.any_non_single_threaded;
-    const shdr_index = switch (decl.ty.zigTypeTag(mod)) {
+    const shdr_index = switch (decl.typeOf(mod).zigTypeTag(mod)) {
         .Fn => elf_file.zig_text_section_index.?,
         else => blk: {
             if (decl.getOwnedVariable(mod)) |variable| {
@@ -1158,7 +1158,7 @@ pub fn updateDecl(
     const decl_val = if (decl.val.getVariable(mod)) |variable| Value.fromInterned(variable.init) else decl.val;
     const res = if (decl_state) |*ds|
         try codegen.generateSymbol(&elf_file.base, decl.srcLoc(mod), .{
-            .ty = decl.ty,
+            .ty = decl.typeOf(mod),
             .val = decl_val,
         }, &code_buffer, .{
             .dwarf = ds,
@@ -1167,7 +1167,7 @@ pub fn updateDecl(
         })
     else
         try codegen.generateSymbol(&elf_file.base, decl.srcLoc(mod), .{
-            .ty = decl.ty,
+            .ty = decl.typeOf(mod),
             .val = decl_val,
         }, &code_buffer, .none, .{
             .parent_atom_index = sym_index,
src/link/MachO/ZigObject.zig
@@ -740,7 +740,7 @@ pub fn updateDecl(
     const dio: codegen.DebugInfoOutput = if (decl_state) |*ds| .{ .dwarf = ds } else .none;
     const res =
         try codegen.generateSymbol(&macho_file.base, decl.srcLoc(mod), .{
-        .ty = decl.ty,
+        .ty = decl.typeOf(mod),
         .val = decl_val,
     }, &code_buffer, dio, .{
         .parent_atom_index = sym_index,
@@ -1021,7 +1021,7 @@ fn getDeclOutputSection(
     _ = self;
     const mod = macho_file.base.comp.module.?;
     const any_non_single_threaded = macho_file.base.comp.config.any_non_single_threaded;
-    const sect_id: u8 = switch (decl.ty.zigTypeTag(mod)) {
+    const sect_id: u8 = switch (decl.typeOf(mod).zigTypeTag(mod)) {
         .Fn => macho_file.zig_text_sect_index.?,
         else => blk: {
             if (decl.getOwnedVariable(mod)) |variable| {
src/link/Wasm/ZigObject.zig
@@ -270,7 +270,7 @@ pub fn updateDecl(
     const res = try codegen.generateSymbol(
         &wasm_file.base,
         decl.srcLoc(mod),
-        .{ .ty = decl.ty, .val = val },
+        .{ .ty = decl.typeOf(mod), .val = val },
         &code_writer,
         .none,
         .{ .parent_atom_index = @intFromEnum(atom.sym_index) },
@@ -346,7 +346,7 @@ fn finishUpdateDecl(
     try atom.code.appendSlice(gpa, code);
     atom.size = @intCast(code.len);
 
-    switch (decl.ty.zigTypeTag(mod)) {
+    switch (decl.typeOf(mod).zigTypeTag(mod)) {
         .Fn => {
             sym.index = try zig_object.appendFunction(gpa, .{ .type_index = zig_object.atom_types.get(atom_index).? });
             sym.tag = .function;
@@ -764,7 +764,7 @@ pub fn getDeclVAddr(
     const atom_index = wasm_file.symbol_atom.get(.{ .file = zig_object.index, .index = @enumFromInt(reloc_info.parent_atom_index) }).?;
     const atom = wasm_file.getAtomPtr(atom_index);
     const is_wasm32 = target.cpu.arch == .wasm32;
-    if (decl.ty.zigTypeTag(mod) == .Fn) {
+    if (decl.typeOf(mod).zigTypeTag(mod) == .Fn) {
         std.debug.assert(reloc_info.addend == 0); // addend not allowed for function relocations
         try atom.relocs.append(gpa, .{
             .index = target_symbol_index,
@@ -964,7 +964,7 @@ pub fn freeDecl(zig_object: *ZigObject, wasm_file: *Wasm, decl_index: InternPool
     if (sym.isGlobal()) {
         std.debug.assert(zig_object.global_syms.remove(atom.sym_index));
     }
-    switch (decl.ty.zigTypeTag(mod)) {
+    switch (decl.typeOf(mod).zigTypeTag(mod)) {
         .Fn => {
             zig_object.functions_free_list.append(gpa, sym.index) catch {};
             std.debug.assert(zig_object.atom_types.remove(atom_index));
src/link/C.zig
@@ -209,7 +209,7 @@ pub fn updateFunc(
                 .module = module,
                 .error_msg = null,
                 .pass = .{ .decl = decl_index },
-                .is_naked_fn = decl.ty.fnCallingConvention(module) == .Naked,
+                .is_naked_fn = decl.typeOf(module).fnCallingConvention(module) == .Naked,
                 .fwd_decl = fwd_decl.toManaged(gpa),
                 .ctypes = ctypes.*,
                 .anon_decl_deps = self.anon_decls,
src/link/Coff.zig
@@ -1272,7 +1272,7 @@ pub fn updateDecl(
 
     const decl_val = if (decl.val.getVariable(mod)) |variable| Value.fromInterned(variable.init) else decl.val;
     const res = try codegen.generateSymbol(&self.base, decl.srcLoc(mod), .{
-        .ty = decl.ty,
+        .ty = decl.typeOf(mod),
         .val = decl_val,
     }, &code_buffer, .none, .{
         .parent_atom_index = atom.getSymbolIndex().?,
@@ -1399,8 +1399,8 @@ pub fn getOrCreateAtomForDecl(self: *Coff, decl_index: InternPool.DeclIndex) !At
 
 fn getDeclOutputSection(self: *Coff, decl_index: InternPool.DeclIndex) u16 {
     const decl = self.base.comp.module.?.declPtr(decl_index);
-    const ty = decl.ty;
     const mod = self.base.comp.module.?;
+    const ty = decl.typeOf(mod);
     const zig_ty = ty.zigTypeTag(mod);
     const val = decl.val;
     const index: u16 = blk: {
@@ -1535,7 +1535,7 @@ pub fn updateExports(
                 .x86 => std.builtin.CallingConvention.Stdcall,
                 else => std.builtin.CallingConvention.C,
             };
-            const decl_cc = exported_decl.ty.fnCallingConvention(mod);
+            const decl_cc = exported_decl.typeOf(mod).fnCallingConvention(mod);
             if (decl_cc == .C and ip.stringEqlSlice(exp.opts.name, "main") and
                 comp.config.link_libc)
             {
src/link/Dwarf.zig
@@ -1109,7 +1109,7 @@ pub fn initDeclState(self: *Dwarf, mod: *Module, decl_index: InternPool.DeclInde
 
     assert(decl.has_tv);
 
-    switch (decl.ty.zigTypeTag(mod)) {
+    switch (decl.typeOf(mod).zigTypeTag(mod)) {
         .Fn => {
             _ = try self.getOrCreateAtomForDecl(.src_fn, decl_index);
 
@@ -1162,7 +1162,7 @@ pub fn initDeclState(self: *Dwarf, mod: *Module, decl_index: InternPool.DeclInde
             try dbg_info_buffer.ensureUnusedCapacity(1 + ptr_width_bytes + 4 + 4 +
                 (decl_name_slice.len + 1) + (decl_linkage_name_slice.len + 1));
 
-            const fn_ret_type = decl.ty.fnReturnType(mod);
+            const fn_ret_type = decl.typeOf(mod).fnReturnType(mod);
             const fn_ret_has_bits = fn_ret_type.hasRuntimeBits(mod);
             dbg_info_buffer.appendAssumeCapacity(@intFromEnum(
                 @as(AbbrevCode, if (fn_ret_has_bits) .subprogram else .subprogram_retvoid),
@@ -1215,7 +1215,7 @@ pub fn commitDeclState(
     var dbg_info_buffer = &decl_state.dbg_info;
 
     assert(decl.has_tv);
-    switch (decl.ty.zigTypeTag(zcu)) {
+    switch (decl.typeOf(zcu).zigTypeTag(zcu)) {
         .Fn => {
             try decl_state.setInlineFunc(decl.val.toIntern());
 
src/link/Plan9.zig
@@ -177,7 +177,7 @@ pub const Atom = struct {
             return if (self.code_ptr) |p| p[0..self.other.code_len] else blk: {
                 const decl_index = self.other.decl_index;
                 const decl = mod.declPtr(decl_index);
-                if (decl.ty.zigTypeTag(mod) == .Fn) {
+                if (decl.typeOf(mod).zigTypeTag(mod) == .Fn) {
                     const table = plan9.fn_decl_table.get(decl.getFileScope(mod)).?.functions;
                     const output = table.get(decl_index).?;
                     break :blk output.code;
@@ -540,7 +540,7 @@ pub fn updateDecl(self: *Plan9, mod: *Module, decl_index: InternPool.DeclIndex)
     const decl_val = if (decl.val.getVariable(mod)) |variable| Value.fromInterned(variable.init) else decl.val;
     // TODO we need the symbol index for symbol in the table of locals for the containing atom
     const res = try codegen.generateSymbol(&self.base, decl.srcLoc(mod), .{
-        .ty = decl.ty,
+        .ty = decl.typeOf(mod),
         .val = decl_val,
     }, &code_buffer, .{ .none = {} }, .{
         .parent_atom_index = @as(Atom.Index, @intCast(atom_idx)),
@@ -566,7 +566,7 @@ fn updateFinish(self: *Plan9, decl_index: InternPool.DeclIndex) !void {
     const gpa = self.base.comp.gpa;
     const mod = self.base.comp.module.?;
     const decl = mod.declPtr(decl_index);
-    const is_fn = (decl.ty.zigTypeTag(mod) == .Fn);
+    const is_fn = (decl.typeOf(mod).zigTypeTag(mod) == .Fn);
     const sym_t: aout.Sym.Type = if (is_fn) .t else .d;
 
     const atom = self.getAtomPtr(self.decls.get(decl_index).?.index);
src/link/SpirV.zig
@@ -163,7 +163,7 @@ pub fn updateExports(
     if (decl.val.isFuncBody(mod)) {
         const target = mod.getTarget();
         const spv_decl_index = try self.object.resolveDecl(mod, decl_index);
-        const execution_model = switch (decl.ty.fnCallingConvention(mod)) {
+        const execution_model = switch (decl.typeOf(mod).fnCallingConvention(mod)) {
             .Vertex => spec.ExecutionModel.Vertex,
             .Fragment => spec.ExecutionModel.Fragment,
             .Kernel => spec.ExecutionModel.Kernel,
src/codegen.zig
@@ -829,8 +829,8 @@ fn lowerDeclRef(
     const target = namespace.file_scope.mod.resolved_target.result;
 
     const ptr_width = target.ptrBitWidth();
-    const is_fn_body = decl.ty.zigTypeTag(zcu) == .Fn;
-    if (!is_fn_body and !decl.ty.hasRuntimeBits(zcu)) {
+    const is_fn_body = decl.typeOf(zcu).zigTypeTag(zcu) == .Fn;
+    if (!is_fn_body and !decl.typeOf(zcu).hasRuntimeBits(zcu)) {
         try code.appendNTimes(0xaa, @divExact(ptr_width, 8));
         return Result.ok;
     }
@@ -932,7 +932,7 @@ fn genDeclRef(
     };
     const decl = zcu.declPtr(decl_index);
 
-    if (!decl.ty.isFnOrHasRuntimeBitsIgnoreComptime(zcu)) {
+    if (!decl.typeOf(zcu).isFnOrHasRuntimeBitsIgnoreComptime(zcu)) {
         const imm: u64 = switch (ptr_bytes) {
             1 => 0xaa,
             2 => 0xaaaa,
src/InternPool.zig
@@ -6581,7 +6581,6 @@ pub fn getFuncInstance(ip: *InternPool, gpa: Allocator, arg: GetFuncInstanceKey)
         generic_owner,
         func_index,
         func_extra_index,
-        func_ty,
         arg.alignment,
         arg.section,
     );
@@ -6711,7 +6710,6 @@ pub fn getFuncInstanceIes(
         generic_owner,
         func_index,
         func_extra_index,
-        func_ty,
         arg.alignment,
         arg.section,
     );
@@ -6723,7 +6721,6 @@ fn finishFuncInstance(
     generic_owner: Index,
     func_index: Index,
     func_extra_index: u32,
-    func_ty: Index,
     alignment: Alignment,
     section: OptionalNullTerminatedString,
 ) Allocator.Error!Index {
@@ -6735,7 +6732,6 @@ fn finishFuncInstance(
         .src_line = fn_owner_decl.src_line,
         .has_tv = true,
         .owns_tv = true,
-        .ty = @import("type.zig").Type.fromInterned(func_ty),
         .val = @import("Value.zig").fromInterned(func_index),
         .alignment = alignment,
         .@"linksection" = section,
src/Module.zig
@@ -330,9 +330,6 @@ const ValueArena = struct {
 
 pub const Decl = struct {
     name: InternPool.NullTerminatedString,
-    /// The most recent Type of the Decl after a successful semantic analysis.
-    /// Populated when `has_tv`.
-    ty: Type,
     /// The most recent Value of the Decl after a successful semantic analysis.
     /// Populated when `has_tv`.
     val: Value,
@@ -487,20 +484,28 @@ pub const Decl = struct {
             zcu.namespacePtr(decl.src_namespace).fullyQualifiedName(zcu, decl.name);
     }
 
-    pub fn typedValue(decl: Decl) error{AnalysisFail}!TypedValue {
+    pub fn typeOf(decl: Decl, zcu: *const Zcu) Type {
+        assert(decl.has_tv);
+        return Type.fromInterned(zcu.intern_pool.typeOf(decl.val.toIntern()));
+    }
+
+    pub fn typedValue(decl: Decl, zcu: *const Zcu) error{AnalysisFail}!TypedValue {
         if (!decl.has_tv) return error.AnalysisFail;
-        return TypedValue{ .ty = decl.ty, .val = decl.val };
+        return .{
+            .ty = decl.typeOf(zcu),
+            .val = decl.val,
+        };
     }
 
     pub fn internValue(decl: *Decl, zcu: *Zcu) Allocator.Error!InternPool.Index {
         assert(decl.has_tv);
-        const ip_index = try decl.val.intern(decl.ty, zcu);
+        const ip_index = try decl.val.intern(decl.typeOf(zcu), zcu);
         decl.val = Value.fromInterned(ip_index);
         return ip_index;
     }
 
     pub fn isFunction(decl: Decl, zcu: *const Zcu) !bool {
-        const tv = try decl.typedValue();
+        const tv = try decl.typedValue(zcu);
         return tv.ty.zigTypeTag(zcu) == .Fn;
     }
 
@@ -590,7 +595,7 @@ pub const Decl = struct {
             @tagName(decl.analysis),
         });
         if (decl.has_tv) {
-            std.debug.print(" ty={} val={}", .{ decl.ty, decl.val });
+            std.debug.print(" val={}", .{decl.val});
         }
         std.debug.print("\n", .{});
     }
@@ -615,7 +620,7 @@ pub const Decl = struct {
     pub fn getAlignment(decl: Decl, zcu: *Zcu) Alignment {
         assert(decl.has_tv);
         if (decl.alignment != .none) return decl.alignment;
-        return decl.ty.abiAlignment(zcu);
+        return decl.typeOf(zcu).abiAlignment(zcu);
     }
 
     /// Upgrade a `LazySrcLoc` to a `SrcLoc` based on the `Decl` provided.
@@ -3525,7 +3530,6 @@ fn semaFile(mod: *Module, file: *File) SemaError!void {
     new_decl.src_line = 0;
     new_decl.is_pub = true;
     new_decl.is_exported = false;
-    new_decl.ty = Type.type;
     new_decl.alignment = .none;
     new_decl.@"linksection" = .none;
     new_decl.alive = true; // This Decl corresponds to a File and is therefore always alive.
@@ -3594,7 +3598,7 @@ fn semaDecl(mod: *Module, decl_index: Decl.Index) !SemaDeclResult {
 
     const old_has_tv = decl.has_tv;
     // The following values are ignored if `!old_has_tv`
-    const old_ty = decl.ty;
+    const old_ty = decl.typeOf(mod);
     const old_val = decl.val;
     const old_align = decl.alignment;
     const old_linksection = decl.@"linksection";
@@ -3716,7 +3720,6 @@ fn semaDecl(mod: *Module, decl_index: Decl.Index) !SemaDeclResult {
             return sema.fail(&block_scope, ty_src, "type {} has no namespace", .{ty.fmt(mod)});
         }
 
-        decl.ty = Type.fromInterned(InternPool.Index.type_type);
         decl.val = ty.toValue();
         decl.alignment = .none;
         decl.@"linksection" = .none;
@@ -3760,7 +3763,6 @@ fn semaDecl(mod: *Module, decl_index: Decl.Index) !SemaDeclResult {
         },
     }
 
-    decl.ty = decl_tv.ty;
     decl.val = Value.fromInterned((try decl_tv.val.intern(decl_tv.ty, mod)));
     // Function linksection, align, and addrspace were already set by Sema
     if (!is_func) {
@@ -3806,10 +3808,10 @@ fn semaDecl(mod: *Module, decl_index: Decl.Index) !SemaDeclResult {
     decl.analysis = .complete;
 
     const result: SemaDeclResult = if (old_has_tv) .{
-        .invalidate_decl_val = !decl.ty.eql(old_ty, mod) or
-            !decl.val.eql(old_val, decl.ty, mod) or
+        .invalidate_decl_val = !decl_tv.ty.eql(old_ty, mod) or
+            !decl.val.eql(old_val, decl_tv.ty, mod) or
             is_inline != old_is_inline,
-        .invalidate_decl_ref = !decl.ty.eql(old_ty, mod) or
+        .invalidate_decl_ref = !decl_tv.ty.eql(old_ty, mod) or
             decl.alignment != old_align or
             decl.@"linksection" != old_linksection or
             decl.@"addrspace" != old_addrspace or
@@ -3819,11 +3821,11 @@ fn semaDecl(mod: *Module, decl_index: Decl.Index) !SemaDeclResult {
         .invalidate_decl_ref = true,
     };
 
-    const has_runtime_bits = queue_linker_work and (is_func or try sema.typeHasRuntimeBits(decl.ty));
+    const has_runtime_bits = queue_linker_work and (is_func or try sema.typeHasRuntimeBits(decl_tv.ty));
     if (has_runtime_bits) {
         // Needed for codegen_decl which will call updateDecl and then the
         // codegen backend wants full access to the Decl Type.
-        try sema.resolveTypeFully(decl.ty);
+        try sema.resolveTypeFully(decl_tv.ty);
 
         try mod.comp.work_queue.writeItem(.{ .codegen_decl = decl_index });
 
@@ -3850,7 +3852,7 @@ fn semaAnonOwnerDecl(zcu: *Zcu, decl_index: Decl.Index) !SemaDeclResult {
 
     log.debug("semaAnonOwnerDecl '{d}'", .{@intFromEnum(decl_index)});
 
-    switch (decl.ty.zigTypeTag(zcu)) {
+    switch (decl.typeOf(zcu).zigTypeTag(zcu)) {
         .Fn => @panic("TODO: update fn instance"),
         .Type => {},
         else => unreachable,
@@ -4479,7 +4481,7 @@ pub fn finalizeAnonDecl(mod: *Module, decl_index: Decl.Index) Allocator.Error!vo
     // if the Decl is referenced by an instruction or another constant. Otherwise,
     // the Decl will be garbage collected by the `codegen_decl` task instead of sent
     // to the linker.
-    if (mod.declPtr(decl_index).ty.isFnOrHasRuntimeBits(mod)) {
+    if (mod.declPtr(decl_index).typeOf(mod).isFnOrHasRuntimeBits(mod)) {
         try mod.comp.anon_work_queue.writeItem(.{ .codegen_decl = decl_index });
     }
 }
@@ -4563,7 +4565,7 @@ pub fn analyzeFnBody(mod: *Module, func_index: InternPool.Index, arena: Allocato
     // the runtime-known parameters only, not to be confused with the
     // generic_owner function type, which potentially has more parameters,
     // including comptime parameters.
-    const fn_ty = decl.ty;
+    const fn_ty = decl.typeOf(mod);
     const fn_ty_info = mod.typeToFunc(fn_ty).?;
 
     var sema: Sema = .{
@@ -4812,7 +4814,6 @@ pub fn allocateNewDecl(
         .src_line = undefined,
         .has_tv = false,
         .owns_tv = false,
-        .ty = undefined,
         .val = undefined,
         .alignment = undefined,
         .@"linksection" = .none,
@@ -4889,7 +4890,6 @@ pub fn initNewAnonDecl(
 
     new_decl.name = name;
     new_decl.src_line = src_line;
-    new_decl.ty = typed_value.ty;
     new_decl.val = typed_value.val;
     new_decl.alignment = .none;
     new_decl.@"linksection" = .none;
@@ -5419,7 +5419,7 @@ pub fn populateTestFunctions(
         try mod.ensureDeclAnalyzed(decl_index);
     }
     const decl = mod.declPtr(decl_index);
-    const test_fn_ty = decl.ty.slicePtrFieldType(mod).childType(mod);
+    const test_fn_ty = decl.typeOf(mod).slicePtrFieldType(mod).childType(mod);
 
     const array_decl_index = d: {
         // Add mod.test_functions to an array decl then make the test_functions
@@ -5463,7 +5463,7 @@ pub fn populateTestFunctions(
                 // func
                 try mod.intern(.{ .ptr = .{
                     .ty = try mod.intern(.{ .ptr_type = .{
-                        .child = test_decl.ty.toIntern(),
+                        .child = test_decl.typeOf(mod).toIntern(),
                         .flags = .{
                             .is_const = true,
                         },
@@ -5515,7 +5515,6 @@ pub fn populateTestFunctions(
 
         // Since we are replacing the Decl's value we must perform cleanup on the
         // previous value.
-        decl.ty = new_ty;
         decl.val = new_val;
         decl.has_tv = true;
     }
src/Sema.zig
@@ -6425,16 +6425,17 @@ pub fn analyzeExport(
 
     try mod.ensureDeclAnalyzed(exported_decl_index);
     const exported_decl = mod.declPtr(exported_decl_index);
+    const export_ty = exported_decl.typeOf(mod);
 
-    if (!try sema.validateExternType(exported_decl.ty, .other)) {
+    if (!try sema.validateExternType(export_ty, .other)) {
         const msg = msg: {
-            const msg = try sema.errMsg(block, src, "unable to export type '{}'", .{exported_decl.ty.fmt(mod)});
+            const msg = try sema.errMsg(block, src, "unable to export type '{}'", .{export_ty.fmt(mod)});
             errdefer msg.destroy(gpa);
 
             const src_decl = mod.declPtr(block.src_decl);
-            try sema.explainWhyTypeIsNotExtern(msg, src_decl.toSrcLoc(src, mod), exported_decl.ty, .other);
+            try sema.explainWhyTypeIsNotExtern(msg, src_decl.toSrcLoc(src, mod), export_ty, .other);
 
-            try sema.addDeclaredHereNote(msg, exported_decl.ty);
+            try sema.addDeclaredHereNote(msg, export_ty);
             break :msg msg;
         };
         return sema.failWithOwnedErrorMsg(block, msg);
@@ -6503,7 +6504,7 @@ fn zirSetAlignStack(sema: *Sema, block: *Block, extended: Zir.Inst.Extended.Inst
     }
 
     const fn_owner_decl = mod.funcOwnerDeclPtr(sema.func_index);
-    switch (fn_owner_decl.ty.fnCallingConvention(mod)) {
+    switch (fn_owner_decl.typeOf(mod).fnCallingConvention(mod)) {
         .Naked => return sema.fail(block, src, "@setAlignStack in naked function", .{}),
         .Inline => return sema.fail(block, src, "@setAlignStack in inline function", .{}),
         else => if (block.inlining != null) {
@@ -7692,7 +7693,7 @@ fn analyzeCall(
         // comptime memory is mutated.
         const memoized_arg_values = try sema.arena.alloc(InternPool.Index, func_ty_info.param_types.len);
 
-        const owner_info = mod.typeToFunc(fn_owner_decl.ty).?;
+        const owner_info = mod.typeToFunc(fn_owner_decl.typeOf(mod)).?;
         const new_param_types = try sema.arena.alloc(InternPool.Index, owner_info.param_types.len);
         var new_fn_info: InternPool.GetFuncTypeKey = .{
             .param_types = new_param_types,
@@ -7960,9 +7961,9 @@ fn handleTailCall(sema: *Sema, block: *Block, call_src: LazySrcLoc, func_ty: Typ
         });
     }
     const func_decl = mod.funcOwnerDeclPtr(sema.owner_func_index);
-    if (!func_ty.eql(func_decl.ty, mod)) {
+    if (!func_ty.eql(func_decl.typeOf(mod), mod)) {
         return sema.fail(block, call_src, "unable to perform tail call: type of function being called '{}' does not match type of calling function '{}'", .{
-            func_ty.fmt(mod), func_decl.ty.fmt(mod),
+            func_ty.fmt(mod), func_decl.typeOf(mod).fmt(mod),
         });
     }
     _ = try block.addUnOp(.ret, result);
@@ -26641,7 +26642,7 @@ fn prepareSimplePanic(sema: *Sema, block: *Block) !void {
         // decl_index may be an alias; we must find the decl that actually
         // owns the function.
         try sema.ensureDeclAnalyzed(decl_index);
-        const tv = try mod.declPtr(decl_index).typedValue();
+        const tv = try mod.declPtr(decl_index).typedValue(mod);
         try sema.declareDependency(.{ .decl_val = decl_index });
         assert(tv.ty.zigTypeTag(mod) == .Fn);
         assert(try sema.fnHasRuntimeBits(tv.ty));
@@ -31374,16 +31375,16 @@ fn beginComptimePtrLoad(
         .ptr => |ptr| switch (ptr.addr) {
             .decl => |decl_index| blk: {
                 const decl = mod.declPtr(decl_index);
-                const decl_tv = try decl.typedValue();
+                const decl_tv = try decl.typedValue(mod);
                 try sema.declareDependency(.{ .decl_val = decl_index });
                 if (decl.val.getVariable(mod) != null) return error.RuntimeLoad;
 
-                const layout_defined = decl.ty.hasWellDefinedLayout(mod);
+                const layout_defined = decl.typeOf(mod).hasWellDefinedLayout(mod);
                 break :blk ComptimePtrLoadKit{
                     .parent = if (layout_defined) .{ .tv = decl_tv, .byte_offset = 0 } else null,
                     .pointee = decl_tv,
                     .is_mutable = false,
-                    .ty_without_well_defined_layout = if (!layout_defined) decl.ty else null,
+                    .ty_without_well_defined_layout = if (!layout_defined) decl.typeOf(mod) else null,
                 };
             },
             .comptime_alloc => |alloc_index| kit: {
@@ -32668,7 +32669,7 @@ fn analyzeDeclRefInner(sema: *Sema, decl_index: InternPool.DeclIndex, analyze_fn
     const mod = sema.mod;
     try sema.ensureDeclAnalyzed(decl_index);
 
-    const decl_tv = try mod.declPtr(decl_index).typedValue();
+    const decl_tv = try mod.declPtr(decl_index).typedValue(mod);
     const owner_decl = mod.declPtr(switch (mod.intern_pool.indexToKey(decl_tv.val.toIntern())) {
         .variable => |variable| variable.decl,
         .extern_func => |extern_func| extern_func.decl,
@@ -32697,7 +32698,7 @@ fn analyzeDeclRefInner(sema: *Sema, decl_index: InternPool.DeclIndex, analyze_fn
 fn maybeQueueFuncBodyAnalysis(sema: *Sema, decl_index: InternPool.DeclIndex) !void {
     const mod = sema.mod;
     const decl = mod.declPtr(decl_index);
-    const tv = try decl.typedValue();
+    const tv = try decl.typedValue(mod);
     if (tv.ty.zigTypeTag(mod) != .Fn) return;
     if (!try sema.fnHasRuntimeBits(tv.ty)) return;
     const func_index = tv.val.toIntern();
@@ -36611,7 +36612,7 @@ fn resolveInferredErrorSet(
     // inferred error sets, each call gets an adhoc InferredErrorSet object, which
     // has no corresponding function body.
     const ies_func_owner_decl = mod.declPtr(func.owner_decl);
-    const ies_func_info = mod.typeToFunc(ies_func_owner_decl.ty).?;
+    const ies_func_info = mod.typeToFunc(ies_func_owner_decl.typeOf(mod)).?;
     // if ies declared by a inline function with generic return type, the return_type should be generic_poison,
     // because inline function does not create a new declaration, and the ies has been filled with analyzeCall,
     // so here we can simply skip this case.
@@ -37629,7 +37630,6 @@ fn generateUnionTagTypeNumbered(
         .tag_mode = .explicit,
     });
 
-    new_decl.ty = Type.type;
     new_decl.val = Value.fromInterned(enum_ty);
 
     try mod.finalizeAnonDecl(new_decl_index);
@@ -37675,7 +37675,6 @@ fn generateUnionTagTypeSimple(
 
     const new_decl = mod.declPtr(new_decl_index);
     new_decl.owns_tv = true;
-    new_decl.ty = Type.type;
     new_decl.val = Value.fromInterned(enum_ty);
 
     try mod.finalizeAnonDecl(new_decl_index);
src/TypedValue.zig
@@ -315,7 +315,7 @@ pub fn print(
                         const decl = mod.declPtr(decl_index);
                         if (level == 0) return writer.print("(decl '{}')", .{decl.name.fmt(ip)});
                         return print(.{
-                            .ty = decl.ty,
+                            .ty = decl.typeOf(mod),
                             .val = decl.val,
                         }, writer, level - 1, mod);
                     },
src/Value.zig
@@ -1585,7 +1585,7 @@ pub fn sliceLen(val: Value, mod: *Module) u64 {
     const ip = &mod.intern_pool;
     return switch (ip.indexToKey(val.toIntern())) {
         .ptr => |ptr| switch (ip.indexToKey(switch (ptr.addr) {
-            .decl => |decl| mod.declPtr(decl).ty.toIntern(),
+            .decl => |decl| mod.declPtr(decl).typeOf(mod).toIntern(),
             .comptime_alloc => @panic("TODO"),
             .anon_decl => |anon_decl| ip.typeOf(anon_decl.val),
             .comptime_field => |comptime_field| ip.typeOf(comptime_field),