Add fuzzing for transform::Hlsl BUG=tint:722 Change-Id: Iaf107077a596dd607c2f785d8787177279e0bcef Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/49461 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Auto-Submit: Ryan Harrison <rharrison@chromium.org> Reviewed-by: Ben Clayton <bclayton@google.com>

diff --git a/fuzzers/BUILD.gn b/fuzzers/BUILD.gn
index 9f00ed3..890507a 100644
--- a/fuzzers/BUILD.gn
+++ b/fuzzers/BUILD.gn

@@ -94,6 +94,11 @@
   }
 
   if (tint_build_wgsl_reader && tint_build_hlsl_writer) {
+    fuzzer_test("tint_hlsl_transform_fuzzer") {
+      sources = [ "tint_hlsl_transform_fuzzer.cc" ]
+      deps = [ ":tint_fuzzer_common" ]
+    }
+
     fuzzer_test("tint_wgsl_reader_hlsl_writer_fuzzer") {
       sources = [ "tint_wgsl_reader_hlsl_writer_fuzzer.cc" ]
       deps = [ ":tint_fuzzer_common" ]
@@ -172,7 +177,10 @@
       ]
     }
     if (tint_build_wgsl_reader && tint_build_hlsl_writer) {
-      deps += [ ":tint_wgsl_reader_hlsl_writer_fuzzer" ]
+      deps += [
+        ":tint_hlsl_transform_fuzzer",
+        ":tint_wgsl_reader_hlsl_writer_fuzzer",
+      ]
     }
     if (tint_build_wgsl_reader && tint_build_msl_writer) {
       deps += [ ":tint_wgsl_reader_msl_writer_fuzzer" ]

diff --git a/fuzzers/CMakeLists.txt b/fuzzers/CMakeLists.txt
index f0c617d..08086e0 100644
--- a/fuzzers/CMakeLists.txt
+++ b/fuzzers/CMakeLists.txt

@@ -41,6 +41,7 @@
 
 if (${TINT_BUILD_WGSL_READER} AND ${TINT_BUILD_HLSL_WRITER})
   add_tint_fuzzer(tint_wgsl_reader_hlsl_writer_fuzzer)
+  add_tint_fuzzer(tint_hlsl_transform_fuzzer)
 endif()
 
 if (${TINT_BUILD_WGSL_READER} AND ${TINT_BUILD_MSL_WRITER})

diff --git a/fuzzers/tint_all_transforms_fuzzer.cc b/fuzzers/tint_all_transforms_fuzzer.cc
index 95b130f..5efe17b 100644
--- a/fuzzers/tint_all_transforms_fuzzer.cc
+++ b/fuzzers/tint_all_transforms_fuzzer.cc

@@ -17,29 +17,70 @@
 namespace tint {
 namespace fuzzers {
 
-extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
-  transform::Manager transform_manager;
-  transform::DataMap transform_inputs;
+struct Config {
+  const uint8_t* data;
+  size_t size;
+  transform::Manager manager;
+  transform::DataMap inputs;
+};
 
-  if (!ExtractFirstIndexOffsetInputs(&data, &size, &transform_inputs)) {
-    return 0;
+bool AddPlatformIndependentPasses(Config* config) {
+  if (!ExtractFirstIndexOffsetInputs(&config->data, &config->size,
+                                     &config->inputs)) {
+    return false;
   }
 
-  if (!ExtractBindingRemapperInputs(&data, &size, &transform_inputs)) {
-    return 0;
+  if (!ExtractBindingRemapperInputs(&config->data, &config->size,
+                                    &config->inputs)) {
+    return false;
   }
 
-  transform_manager.Add<transform::BoundArrayAccessors>();
-  transform_manager
+  config->manager.Add<transform::BoundArrayAccessors>();
+  config->manager
       .Add<transform::EmitVertexPointSize>();  // TODO(tint:753): Remove once
                                                // transform used by sanitizers
-  transform_manager.Add<transform::FirstIndexOffset>();
-  transform_manager.Add<transform::BindingRemapper>();
+  config->manager.Add<transform::FirstIndexOffset>();
+  config->manager.Add<transform::BindingRemapper>();
 
-  fuzzers::CommonFuzzer fuzzer(InputFormat::kWGSL, OutputFormat::kSpv);
-  fuzzer.SetTransformManager(&transform_manager, std::move(transform_inputs));
+  return true;
+}
 
-  return fuzzer.Run(data, size);
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  {
+    Config config;
+    config.data = data;
+    config.size = size;
+
+    if (!AddPlatformIndependentPasses(&config)) {
+      return 0;
+    }
+
+    fuzzers::CommonFuzzer fuzzer(InputFormat::kWGSL, OutputFormat::kSpv);
+    fuzzer.SetTransformManager(&(config.manager), std::move(config.inputs));
+
+    fuzzer.Run(config.data, config.size);
+  }
+
+#if TINT_BUILD_HLSL_WRITER
+  {
+    Config config;
+    config.data = data;
+    config.size = size;
+
+    if (!AddPlatformIndependentPasses(&config)) {
+      return 0;
+    }
+
+    config.manager.Add<transform::Hlsl>();
+
+    fuzzers::CommonFuzzer fuzzer(InputFormat::kWGSL, OutputFormat::kHLSL);
+    fuzzer.SetTransformManager(&config.manager, std::move(config.inputs));
+
+    fuzzer.Run(config.data, config.size);
+  }
+#endif  // TINT_BUILD_HLSL_WRITER
+
+  return 0;
 }
 
 }  // namespace fuzzers

diff --git a/fuzzers/tint_hlsl_transform_fuzzer.cc b/fuzzers/tint_hlsl_transform_fuzzer.cc
new file mode 100644
index 0000000..6950f87
--- /dev/null
+++ b/fuzzers/tint_hlsl_transform_fuzzer.cc

@@ -0,0 +1,31 @@
+// Copyright 2021 The Tint Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "fuzzers/tint_common_fuzzer.h"
+
+namespace tint {
+namespace fuzzers {
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  transform::Manager transform_manager;
+  transform_manager.Add<transform::Hlsl>();
+
+  fuzzers::CommonFuzzer fuzzer(InputFormat::kWGSL, OutputFormat::kHLSL);
+  fuzzer.SetTransformManager(&transform_manager, {});
+
+  return fuzzer.Run(data, size);
+}
+
+}  // namespace fuzzers
+}  // namespace tint