[tint][fuzz][ir] Add PreservePadding fuzzer

Bug: tint:2223
Change-Id: Ief3845cb07617cd4491674411d111024488507b1
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/185117
Reviewed-by: James Price <jrprice@google.com>
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: Ben Clayton <bclayton@google.com>

src/tint/lang/core/ir/transform/BUILD.cmake

diff --git a/src/tint/lang/core/ir/transform/BUILD.cmake b/src/tint/lang/core/ir/transform/BUILD.cmake
index 4b59e1b..3b7d395 100644
--- a/src/tint/lang/core/ir/transform/BUILD.cmake
+++ b/src/tint/lang/core/ir/transform/BUILD.cmake
@@ -196,6 +196,7 @@
   lang/core/ir/transform/demote_to_helper_fuzz.cc
   lang/core/ir/transform/direct_variable_access_fuzz.cc
   lang/core/ir/transform/multiplanar_external_texture_fuzz.cc
+  lang/core/ir/transform/preserve_padding_fuzz.cc
 )
 
 tint_target_add_dependencies(tint_lang_core_ir_transform_fuzz fuzz

src/tint/lang/core/ir/transform/BUILD.gn

diff --git a/src/tint/lang/core/ir/transform/BUILD.gn b/src/tint/lang/core/ir/transform/BUILD.gn
index cf7d327..3a03326 100644
--- a/src/tint/lang/core/ir/transform/BUILD.gn
+++ b/src/tint/lang/core/ir/transform/BUILD.gn
@@ -189,6 +189,7 @@
     "demote_to_helper_fuzz.cc",
     "direct_variable_access_fuzz.cc",
     "multiplanar_external_texture_fuzz.cc",
+    "preserve_padding_fuzz.cc",
   ]
   deps = [
     "${tint_src_dir}/api/common",

src/tint/lang/core/ir/transform/preserve_padding_fuzz.cc

diff --git a/src/tint/lang/core/ir/transform/preserve_padding_fuzz.cc b/src/tint/lang/core/ir/transform/preserve_padding_fuzz.cc
new file mode 100644
index 0000000..1dddfd9
--- /dev/null
+++ b/src/tint/lang/core/ir/transform/preserve_padding_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/preserve_padding.h"
+
+#include "src/tint/cmd/fuzz/ir/fuzz.h"
+#include "src/tint/lang/core/ir/validator.h"
+
+namespace tint::core::ir::transform {
+namespace {
+
+void PreservePaddingFuzzer(Module& module) {
+    if (auto res = PreservePadding(module); res != Success) {
+        return;
+    }
+
+    Capabilities capabilities;
+    if (auto res = Validate(module, capabilities); res != Success) {
+        TINT_ICE() << "result of PreservePadding failed IR validation\n" << res.Failure();
+    }
+}
+
+}  // namespace
+}  // namespace tint::core::ir::transform
+
+TINT_IR_MODULE_FUZZER(tint::core::ir::transform::PreservePaddingFuzzer);