Sema: improve array source location

src/AstGen.zig

@@ -1320,7 +1320,10 @@ fn arrayInitExpr(
                 const len_inst = try gz.addInt(array_init.ast.elements.len);
                 const elem_type = try typeExpr(gz, scope, array_type.ast.elem_type);
                 if (array_type.ast.sentinel == 0) {
-                    const array_type_inst = try gz.addBin(.array_type, len_inst, elem_type);
+                    const array_type_inst = try gz.addPlNode(.array_type, array_init.ast.type_expr, Zir.Inst.Bin{
+                        .lhs = len_inst,
+                        .rhs = elem_type,
+                    });
                     break :inst .{
                         .array = array_type_inst,
                         .elem = elem_type,
@@ -1553,7 +1556,10 @@ fn structInitExpr(
             if (is_inferred_array_len) {
                 const elem_type = try typeExpr(gz, scope, array_type.ast.elem_type);
                 const array_type_inst = if (array_type.ast.sentinel == 0) blk: {
-                    break :blk try gz.addBin(.array_type, .zero_usize, elem_type);
+                    break :blk try gz.addPlNode(.array_type, struct_init.ast.type_expr, Zir.Inst.Bin{
+                        .lhs = .zero_usize,
+                        .rhs = elem_type,
+                    });
                 } else blk: {
                     const sentinel = try comptimeExpr(gz, scope, .{ .ty = elem_type }, array_type.ast.sentinel);
                     break :blk try gz.addPlNode(
@@ -3203,7 +3209,10 @@ fn arrayType(gz: *GenZir, scope: *Scope, rl: ResultLoc, node: Ast.Node.Index) !Z
     const len = try expr(gz, scope, .{ .coerced_ty = .usize_type }, len_node);
     const elem_type = try typeExpr(gz, scope, node_datas[node].rhs);
 
-    const result = try gz.addBin(.array_type, len, elem_type);
+    const result = try gz.addPlNode(.array_type, node, Zir.Inst.Bin{
+        .lhs = len,
+        .rhs = elem_type,
+    });
     return rvalue(gz, rl, result, node);
 }
 

src/Sema.zig

@@ -2815,7 +2815,7 @@ fn zirAllocExtended(
 ) CompileError!Air.Inst.Ref {
     const extra = sema.code.extraData(Zir.Inst.AllocExtended, extended.operand);
     const src = LazySrcLoc.nodeOffset(extra.data.src_node);
-    const ty_src = src; // TODO better source location
+    const ty_src: LazySrcLoc = .{ .node_offset_var_decl_ty = extra.data.src_node };
     const align_src = src; // TODO better source location
     const small = @bitCast(Zir.Inst.AllocExtended.Small, extended.small);
 
@@ -6194,11 +6194,12 @@ fn zirArrayType(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!A
     const tracy = trace(@src());
     defer tracy.end();
 
-    const bin_inst = sema.code.instructions.items(.data)[inst].bin;
-    const len_src = sema.src; // TODO better source location
-    const elem_src = sema.src; // TODO better source location
-    const len = try sema.resolveInt(block, len_src, bin_inst.lhs, Type.usize);
-    const elem_type = try sema.resolveType(block, elem_src, bin_inst.rhs);
+    const inst_data = sema.code.instructions.items(.data)[inst].pl_node;
+    const extra = sema.code.extraData(Zir.Inst.Bin, inst_data.payload_index).data;
+    const len_src: LazySrcLoc = .{ .node_offset_array_type_len = inst_data.src_node };
+    const elem_src: LazySrcLoc = .{ .node_offset_array_type_elem = inst_data.src_node };
+    const len = try sema.resolveInt(block, len_src, extra.lhs, Type.usize);
+    const elem_type = try sema.resolveType(block, elem_src, extra.rhs);
     const array_ty = try Type.array(sema.arena, len, null, elem_type, sema.mod);
 
     return sema.addType(array_ty);
@@ -10570,18 +10571,17 @@ fn analyzeArithmetic(
     if (lhs_zig_ty_tag == .Pointer) switch (lhs_ty.ptrSize()) {
         .One, .Slice => {},
         .Many, .C => {
-            const op_src = src; // TODO better source location
             const air_tag: Air.Inst.Tag = switch (zir_tag) {
                 .add => .ptr_add,
                 .sub => .ptr_sub,
                 else => return sema.fail(
                     block,
-                    op_src,
+                    src,
                     "invalid pointer arithmetic operand: '{s}''",
                     .{@tagName(zir_tag)},
                 ),
             };
-            return analyzePtrArithmetic(sema, block, op_src, lhs, rhs, air_tag, lhs_src, rhs_src);
+            return analyzePtrArithmetic(sema, block, src, lhs, rhs, air_tag, lhs_src, rhs_src);
         },
     };
 

src/Zir.zig

@@ -212,7 +212,7 @@ pub const Inst = struct {
         /// Uses the `pl_node` union field. Payload is `Bin`.
         array_mul,
         /// `[N]T` syntax. No source location provided.
-        /// Uses the `bin` union field. lhs is length, rhs is element type.
+        /// Uses the `pl_node` union field. Payload is `Bin`. lhs is length, rhs is element type.
         array_type,
         /// `[N:S]T` syntax. Source location is the array type expression node.
         /// Uses the `pl_node` union field. Payload is `ArrayTypeSentinel`.
@@ -1571,7 +1571,7 @@ pub const Inst = struct {
                 .param_anytype_comptime = .str_tok,
                 .array_cat = .pl_node,
                 .array_mul = .pl_node,
-                .array_type = .bin,
+                .array_type = .pl_node,
                 .array_type_sentinel = .pl_node,
                 .vector_type = .pl_node,
                 .elem_type_index = .bin,

src/print_zir.zig

@@ -142,7 +142,6 @@ const Writer = struct {
         const tag = tags[inst];
         try stream.print("= {s}(", .{@tagName(tags[inst])});
         switch (tag) {
-            .array_type,
             .as,
             .store,
             .store_to_block_ptr,
@@ -354,6 +353,7 @@ const Writer = struct {
             .elem_ptr,
             .elem_val,
             .coerce_result_ptr,
+            .array_type,
             => try self.writePlNodeBin(stream, inst),
 
             .elem_ptr_imm => try self.writeElemPtrImm(stream, inst),

test/cases/compile_errors/invalid_array_elem_ty.zig

@@ -9,4 +9,4 @@ pub export fn entry() void {
 // target=native
 // backend=stage2
 //
-// :4:1: error: expected type 'type', found 'fn() type'
+// :5:12: error: expected type 'type', found 'fn() type'