Add gn support for regex fuzzer

Allows the tint regex fuzzer to be built using gn, so that it can be
deployed on ClusterFuzz.

Fixes: tint:1075
Change-Id: I88f8bd0eefe3044483b66784cc32feebcdc63928
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/60202
Auto-Submit: Alastair Donaldson <afdx@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: Alastair Donaldson <afdx@google.com>

fuzzers/BUILD.gn

@@ -73,6 +73,12 @@ if (build_with_chromium) {
     "tint_transformation_batch_size=5",
   ]
 
+  tint_regex_fuzzer_common_libfuzzer_options = [
+    "cross_over=0",
+    "max_len=100000",
+    "mutate_depth=1",
+  ]
+
   # fuzzer_test doesn't have configs members, so need to define them in an empty
   # source_set.
 
@@ -113,6 +119,15 @@ if (build_with_chromium) {
       seed_corpus_deps = [ ":tint_generate_wgsl_corpus" ]
     }
 
+    fuzzer_test("tint_regex_wgsl_writer_fuzzer") {
+      sources = []
+      deps = [ "tint_regex_fuzzer:tint_regex_fuzzer" ]
+      libfuzzer_options = tint_regex_fuzzer_common_libfuzzer_options +
+                          [ "tint_fuzzing_target=wgsl" ]
+      seed_corpus = fuzzer_corpus_wgsl_dir
+      seed_corpus_deps = [ ":tint_generate_wgsl_corpus" ]
+    }
+
     fuzzer_test("tint_wgsl_reader_wgsl_writer_fuzzer") {
       sources = [ "tint_wgsl_reader_wgsl_writer_fuzzer.cc" ]
       deps = [ ":tint_fuzzer_common" ]
@@ -164,6 +179,15 @@ if (build_with_chromium) {
       seed_corpus_deps = [ ":tint_generate_wgsl_corpus" ]
     }
 
+    fuzzer_test("tint_regex_spv_writer_fuzzer") {
+      sources = []
+      deps = [ "tint_regex_fuzzer:tint_regex_fuzzer" ]
+      libfuzzer_options = tint_regex_fuzzer_common_libfuzzer_options +
+                          [ "tint_fuzzing_target=spv" ]
+      seed_corpus = fuzzer_corpus_wgsl_dir
+      seed_corpus_deps = [ ":tint_generate_wgsl_corpus" ]
+    }
+
     fuzzer_test("tint_renamer_fuzzer") {
       sources = [ "tint_renamer_fuzzer.cc" ]
       deps = [ ":tint_fuzzer_common" ]
@@ -215,6 +239,15 @@ if (build_with_chromium) {
       seed_corpus_deps = [ ":tint_generate_wgsl_corpus" ]
     }
 
+    fuzzer_test("tint_regex_hlsl_writer_fuzzer") {
+      sources = []
+      deps = [ "tint_regex_fuzzer:tint_regex_fuzzer" ]
+      libfuzzer_options = tint_regex_fuzzer_common_libfuzzer_options +
+                          [ "tint_fuzzing_target=hlsl" ]
+      seed_corpus = fuzzer_corpus_wgsl_dir
+      seed_corpus_deps = [ ":tint_generate_wgsl_corpus" ]
+    }
+
     fuzzer_test("tint_wgsl_reader_hlsl_writer_fuzzer") {
       sources = [ "tint_wgsl_reader_hlsl_writer_fuzzer.cc" ]
       deps = [ ":tint_fuzzer_common" ]
@@ -234,6 +267,15 @@ if (build_with_chromium) {
       seed_corpus_deps = [ ":tint_generate_wgsl_corpus" ]
     }
 
+    fuzzer_test("tint_regex_msl_writer_fuzzer") {
+      sources = []
+      deps = [ "tint_regex_fuzzer:tint_regex_fuzzer" ]
+      libfuzzer_options = tint_regex_fuzzer_common_libfuzzer_options +
+                          [ "tint_fuzzing_target=msl" ]
+      seed_corpus = fuzzer_corpus_wgsl_dir
+      seed_corpus_deps = [ ":tint_generate_wgsl_corpus" ]
+    }
+
     fuzzer_test("tint_wgsl_reader_msl_writer_fuzzer") {
       sources = [ "tint_wgsl_reader_msl_writer_fuzzer.cc" ]
       deps = [ ":tint_fuzzer_common" ]
@@ -340,6 +382,7 @@ if (build_with_chromium) {
     if (tint_build_wgsl_reader && tint_build_wgsl_writer) {
       deps += [
         ":tint_ast_wgsl_writer_fuzzer",
+        ":tint_regex_wgsl_writer_fuzzer",
         ":tint_wgsl_reader_wgsl_writer_fuzzer",
       ]
     }
@@ -350,6 +393,7 @@ if (build_with_chromium) {
         ":tint_binding_remapper_fuzzer",
         ":tint_first_index_offset_fuzzer",
         ":tint_inspector_fuzzer",
+        ":tint_regex_spv_writer_fuzzer",
         ":tint_renamer_fuzzer",
         ":tint_robustness_fuzzer",
         ":tint_single_entry_point_fuzzer",
@@ -360,12 +404,14 @@ if (build_with_chromium) {
     if (tint_build_wgsl_reader && tint_build_hlsl_writer) {
       deps += [
         ":tint_ast_hlsl_writer_fuzzer",
+        ":tint_regex_hlsl_writer_fuzzer",
         ":tint_wgsl_reader_hlsl_writer_fuzzer",
       ]
     }
     if (tint_build_wgsl_reader && tint_build_msl_writer) {
       deps += [
         ":tint_ast_msl_writer_fuzzer",
+        ":tint_regex_msl_writer_fuzzer",
         ":tint_wgsl_reader_msl_writer_fuzzer",
       ]
     }

fuzzers/tint_regex_fuzzer/BUILD.gn

@@ -0,0 +1,35 @@
+# 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.
+
+import("//build_overrides/build.gni")
+import("../../tint_overrides_with_defaults.gni")
+
+if (build_with_chromium) {
+  source_set("tint_regex_fuzzer") {
+    public_configs = [
+      "${tint_root_dir}/src:tint_config",
+      "${tint_root_dir}/src:tint_common_config",
+    ]
+
+    deps = [ "${tint_root_dir}/fuzzers:tint_fuzzer_common" ]
+
+    sources = [
+      "cli.cc",
+      "cli.h",
+      "fuzzer.cc",
+      "wgsl_mutator.cc",
+      "wgsl_mutator.h",
+    ]
+  }
+}