Refactor BUILD.gn so can easily be embedded in other projects

1.
BUILD.gn: Don't use the extra Chromium clang warnings

Also removes the unused .gn secondary_sources.

2.

Move fuzzers in test/ instead of testing/

This frees up testing/ to be the git subtree of Chromium's src/testing/
that contains test.gni, gtest, gmock and libfuzzer

3.

DEPS: get the whole testing/ subtree of Chromium

4.

BUILD.gn: Simplify the standalone gtest targets

These targets definitions are inspired from ANGLE's and add a variable
that is the path of the googletest directory so that it can be made
overridable in future commits.

6.

BUILD.gn: Add overridable variables for deps dirs

This avoids hardcoded paths to dependencies that make it hard to
integrate SPIRV-Tools in other GN projects.

6 files changed, 267 insertions, 0 deletions

diff --git a/test/fuzzers/BUILD.gn b/test/fuzzers/BUILD.gn
new file mode 100644
index 00000000..df8291a5
--- /dev/null
+++ b/test/fuzzers/BUILD.gn
@@ -0,0 +1,121 @@
+# Copyright 2018 Google Inc. All rights reserved.
+#
+# 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("//testing/libfuzzer/fuzzer_test.gni")
+import("//testing/test.gni")
+
+config("fuzzer_config") {
+  configs = [ "../..:spvtools_config" ]
+}
+
+group("fuzzers") {
+  testonly = true
+  deps = []
+
+  if (!build_with_chromium || use_fuzzing_engine) {
+    deps += [ ":fuzzers_bin" ]
+  }
+}
+
+if (!build_with_chromium || use_fuzzing_engine) {
+  group("fuzzers_bin") {
+    testonly = true
+
+    deps = [
+      ":spvtools_val_fuzzer",
+      ":spvtools_opt_legalization_fuzzer",
+      ":spvtools_opt_performance_fuzzer",
+      ":spvtools_opt_size_fuzzer",
+    ]
+  }
+}
+
+template("spvtools_fuzzer") {
+  source_set(target_name) {
+    testonly = true
+    sources = invoker.sources
+    deps = [
+      "../..:spvtools",
+      "../..:spvtools_opt",
+      "../..:spvtools_val",
+    ]
+    if (defined(invoker.deps)) {
+      deps += invoker.deps
+    }
+
+    configs -= [ "//build/config/compiler:chromium_code" ]
+    configs += [
+      "//build/config/compiler:no_chromium_code",
+      ":fuzzer_config",
+    ]
+  }
+}
+
+spvtools_fuzzer("spvtools_opt_performance_fuzzer_src") {
+  sources = [
+    "spvtools_opt_performance_fuzzer.cpp",
+  ]
+}
+
+spvtools_fuzzer("spvtools_opt_legalization_fuzzer_src") {
+  sources = [
+    "spvtools_opt_legalization_fuzzer.cpp",
+  ]
+}
+
+spvtools_fuzzer("spvtools_opt_size_fuzzer_src") {
+  sources = [
+    "spvtools_opt_size_fuzzer.cpp",
+  ]
+}
+
+spvtools_fuzzer("spvtools_val_fuzzer_src") {
+  sources = [
+    "spvtools_val_fuzzer.cpp",
+  ]
+}
+
+if (!build_with_chromium || use_fuzzing_engine) {
+  fuzzer_test("spvtools_opt_performance_fuzzer") {
+    sources = []
+    deps = [
+      ":spvtools_opt_performance_fuzzer_src",
+    ]
+    seed_corpus = "corpora/spv"
+  }
+
+  fuzzer_test("spvtools_opt_legalization_fuzzer") {
+    sources = []
+    deps = [
+      ":spvtools_opt_legalization_fuzzer_src",
+    ]
+    seed_corpus = "corpora/spv"
+  }
+
+  fuzzer_test("spvtools_opt_size_fuzzer") {
+    sources = []
+    deps = [
+      ":spvtools_opt_size_fuzzer_src",
+    ]
+    seed_corpus = "corpora/spv"
+  }
+
+  fuzzer_test("spvtools_val_fuzzer") {
+    sources = []
+    deps = [
+      ":spvtools_val_fuzzer_src",
+    ]
+    seed_corpus = "corpora/spv"
+  }
+}
diff --git a/test/fuzzers/corpora/spv/simple.spv b/test/fuzzers/corpora/spv/simple.spv
new file mode 100644
index 00000000..f972a56f
--- /dev/null
+++ b/test/fuzzers/corpora/spv/simple.spv
diff --git a/test/fuzzers/spvtools_opt_legalization_fuzzer.cpp b/test/fuzzers/spvtools_opt_legalization_fuzzer.cpp
new file mode 100644
index 00000000..f37dcc84
--- /dev/null
+++ b/test/fuzzers/spvtools_opt_legalization_fuzzer.cpp
@@ -0,0 +1,37 @@
+// Copyright (c) 2018 Google Inc.
+//
+// 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 <cstdint>
+
+#include "spirv-tools/optimizer.hpp"
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  spvtools::Optimizer optimizer(SPV_ENV_UNIVERSAL_1_3);
+  optimizer.SetMessageConsumer([](spv_message_level_t, const char*,
+                                  const spv_position_t&, const char*) {});
+
+  std::vector<uint32_t> input;
+  input.resize(size >> 2);
+
+  size_t count = 0;
+  for (size_t i = 0; (i + 3) < size; i += 4) {
+    input[count++] = data[i] | (data[i + 1] << 8) | (data[i + 2] << 16) |
+                     (data[i + 3]) << 24;
+  }
+
+  optimizer.RegisterLegalizationPasses();
+  optimizer.Run(input.data(), input.size(), &input);
+
+  return 0;
+}
diff --git a/test/fuzzers/spvtools_opt_performance_fuzzer.cpp b/test/fuzzers/spvtools_opt_performance_fuzzer.cpp
new file mode 100644
index 00000000..7f94febc
--- /dev/null
+++ b/test/fuzzers/spvtools_opt_performance_fuzzer.cpp
@@ -0,0 +1,37 @@
+// Copyright (c) 2018 Google Inc.
+//
+// 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 <cstdint>
+
+#include "spirv-tools/optimizer.hpp"
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  spvtools::Optimizer optimizer(SPV_ENV_UNIVERSAL_1_3);
+  optimizer.SetMessageConsumer([](spv_message_level_t, const char*,
+                                  const spv_position_t&, const char*) {});
+
+  std::vector<uint32_t> input;
+  input.resize(size >> 2);
+
+  size_t count = 0;
+  for (size_t i = 0; (i + 3) < size; i += 4) {
+    input[count++] = data[i] | (data[i + 1] << 8) | (data[i + 2] << 16) |
+                     (data[i + 3]) << 24;
+  }
+
+  optimizer.RegisterPerformancePasses();
+  optimizer.Run(input.data(), input.size(), &input);
+
+  return 0;
+}
diff --git a/test/fuzzers/spvtools_opt_size_fuzzer.cpp b/test/fuzzers/spvtools_opt_size_fuzzer.cpp
new file mode 100644
index 00000000..1f06a71f
--- /dev/null
+++ b/test/fuzzers/spvtools_opt_size_fuzzer.cpp
@@ -0,0 +1,37 @@
+// Copyright (c) 2018 Google Inc.
+//
+// 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 <cstdint>
+
+#include "spirv-tools/optimizer.hpp"
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  spvtools::Optimizer optimizer(SPV_ENV_UNIVERSAL_1_3);
+  optimizer.SetMessageConsumer([](spv_message_level_t, const char*,
+                                  const spv_position_t&, const char*) {});
+
+  std::vector<uint32_t> input;
+  input.resize(size >> 2);
+
+  size_t count = 0;
+  for (size_t i = 0; (i + 3) < size; i += 4) {
+    input[count++] = data[i] | (data[i + 1] << 8) | (data[i + 2] << 16) |
+                     (data[i + 3]) << 24;
+  }
+
+  optimizer.RegisterSizePasses();
+  optimizer.Run(input.data(), input.size(), &input);
+
+  return 0;
+}
diff --git a/test/fuzzers/spvtools_val_fuzzer.cpp b/test/fuzzers/spvtools_val_fuzzer.cpp
new file mode 100644
index 00000000..9b06a1f6
--- /dev/null
+++ b/test/fuzzers/spvtools_val_fuzzer.cpp
@@ -0,0 +1,35 @@
+// Copyright (c) 2018 Google Inc.
+//
+// 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 <cstdint>
+
+#include "spirv-tools/libspirv.hpp"
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  spvtools::SpirvTools tools(SPV_ENV_UNIVERSAL_1_3);
+  tools.SetMessageConsumer([](spv_message_level_t, const char*,
+                              const spv_position_t&, const char*) {});
+
+  std::vector<uint32_t> input;
+  input.resize(size >> 2);
+
+  size_t count = 0;
+  for (size_t i = 0; (i + 3) < size; i += 4) {
+    input[count++] = data[i] | (data[i + 1] << 8) | (data[i + 2] << 16) |
+                     (data[i + 3]) << 24;
+  }
+
+  tools.Validate(input);
+  return 0;
+}