Add more fuzzers for Optimizer. (#1788)

This Cl adds the legalization and size fuzzers for the optimizer. The
main optimizer is renamed to the performance optimizer.

BUILD.gn

@@ -414,6 +414,8 @@ static_library("spvtools_opt") {
     "source/opt/cfg.h",
     "source/opt/cfg_cleanup_pass.cpp",
     "source/opt/cfg_cleanup_pass.h",
+    "source/opt/combine_access_chains.cpp",
+    "source/opt/combine_access_chains.h",
     "source/opt/common_uniform_elim_pass.cpp",
     "source/opt/common_uniform_elim_pass.h",
     "source/opt/compact_ids_pass.cpp",

testing/fuzzers/BUILD.gn

@@ -33,8 +33,10 @@ if (!build_with_chromium || use_fuzzing_engine) {
     testonly = true
 
     deps = [
-      ":spvtools_opt_fuzzer",
       ":spvtools_val_fuzzer",
+      ":spvtools_opt_legalization_fuzzer",
+      ":spvtools_opt_performance_fuzzer",
+      ":spvtools_opt_size_fuzzer",
     ]
   }
 }
@@ -60,9 +62,21 @@ template("spvtools_fuzzer") {
   }
 }
 
-spvtools_fuzzer("spvtools_opt_fuzzer_src") {
+spvtools_fuzzer("spvtools_opt_performance_fuzzer_src") {
   sources = [
-    "spvtools_opt_fuzzer.cpp",
+    "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",
   ]
 }
 
@@ -73,10 +87,26 @@ spvtools_fuzzer("spvtools_val_fuzzer_src") {
 }
 
 if (!build_with_chromium || use_fuzzing_engine) {
-  fuzzer_test("spvtools_opt_fuzzer") {
+  fuzzer_test("spvtools_opt_performance_fuzzer") {
     sources = []
     deps = [
-      ":spvtools_opt_fuzzer_src",
+      ":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"
   }

testing/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;
+}

testing/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;
+}