[tint][fuzz][ir] Add DirectVariableAccess fuzzer

Bug: tint:2223
Change-Id: Ib7d32d223c8648acdbcd014ab3c0c9312eebb2ed
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/185115
Reviewed-by: James Price <jrprice@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
diff --git a/src/tint/lang/core/ir/transform/BUILD.cmake b/src/tint/lang/core/ir/transform/BUILD.cmake
index 8fb81a3..e99c1ba 100644
--- a/src/tint/lang/core/ir/transform/BUILD.cmake
+++ b/src/tint/lang/core/ir/transform/BUILD.cmake
@@ -194,6 +194,7 @@
   lang/core/ir/transform/combine_access_instructions_fuzz.cc
   lang/core/ir/transform/conversion_polyfill_fuzz.cc
   lang/core/ir/transform/demote_to_helper_fuzz.cc
+  lang/core/ir/transform/direct_variable_access_fuzz.cc
 )
 
 tint_target_add_dependencies(tint_lang_core_ir_transform_fuzz fuzz
diff --git a/src/tint/lang/core/ir/transform/BUILD.gn b/src/tint/lang/core/ir/transform/BUILD.gn
index 9e110c2..19cfe1e 100644
--- a/src/tint/lang/core/ir/transform/BUILD.gn
+++ b/src/tint/lang/core/ir/transform/BUILD.gn
@@ -187,6 +187,7 @@
     "combine_access_instructions_fuzz.cc",
     "conversion_polyfill_fuzz.cc",
     "demote_to_helper_fuzz.cc",
+    "direct_variable_access_fuzz.cc",
   ]
   deps = [
     "${tint_src_dir}/api/common",
diff --git a/src/tint/lang/core/ir/transform/direct_variable_access.h b/src/tint/lang/core/ir/transform/direct_variable_access.h
index ffa169b..ced1943 100644
--- a/src/tint/lang/core/ir/transform/direct_variable_access.h
+++ b/src/tint/lang/core/ir/transform/direct_variable_access.h
@@ -28,6 +28,7 @@
 #ifndef SRC_TINT_LANG_CORE_IR_TRANSFORM_DIRECT_VARIABLE_ACCESS_H_
 #define SRC_TINT_LANG_CORE_IR_TRANSFORM_DIRECT_VARIABLE_ACCESS_H_
 
+#include "src/tint/utils/reflection/reflection.h"
 #include "src/tint/utils/result/result.h"
 
 // Forward declarations.
@@ -43,6 +44,9 @@
     bool transform_private = false;
     /// If true, then 'function' sub-object pointer arguments will be transformed.
     bool transform_function = false;
+
+    /// Reflection for this class
+    TINT_REFLECT(DirectVariableAccessOptions, transform_private, transform_function);
 };
 
 /// DirectVariableAccess is a transform that transforms pointer parameters in the 'storage',
diff --git a/src/tint/lang/core/ir/transform/direct_variable_access_fuzz.cc b/src/tint/lang/core/ir/transform/direct_variable_access_fuzz.cc
new file mode 100644
index 0000000..33f0306
--- /dev/null
+++ b/src/tint/lang/core/ir/transform/direct_variable_access_fuzz.cc
@@ -0,0 +1,50 @@
+// Copyright 2024 The Dawn & Tint Authors
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this
+//    list of conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice,
+//    this list of conditions and the following disclaimer in the documentation
+//    and/or other materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its
+//    contributors may be used to endorse or promote products derived from
+//    this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "src/tint/lang/core/ir/transform/direct_variable_access.h"
+
+#include "src/tint/cmd/fuzz/ir/fuzz.h"
+#include "src/tint/lang/core/ir/validator.h"
+
+namespace tint::core::ir::transform {
+namespace {
+
+void DirectVariableAccessFuzzer(Module& module, DirectVariableAccessOptions options) {
+    if (auto res = DirectVariableAccess(module, options); res != Success) {
+        return;
+    }
+
+    Capabilities capabilities;
+    if (auto res = Validate(module, capabilities); res != Success) {
+        TINT_ICE() << "result of DirectVariableAccess failed IR validation\n" << res.Failure();
+    }
+}
+
+}  // namespace
+}  // namespace tint::core::ir::transform
+
+TINT_IR_MODULE_FUZZER(tint::core::ir::transform::DirectVariableAccessFuzzer);