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centipede/BUILD

@@ -56,6 +56,7 @@ cc_binary(
         ":centipede_interface",
         ":config_file",
         ":environment_flags",
+        "@com_google_absl//absl/base:nullability",
         "@com_google_absl//absl/log:flags",
     ],
 )
@@ -76,6 +77,7 @@ cc_binary(
         ":seed_corpus_maker_flags",
         ":seed_corpus_maker_lib",
         ":util",
+        "@com_google_absl//absl/base:nullability",
         "@com_google_absl//absl/flags:flag",
         "@com_google_absl//absl/log",
         "@com_google_absl//absl/log:check",
@@ -92,6 +94,7 @@ cc_binary(
         ":logging",
         ":remote_file",
         ":rusage_profiler",
+        "@com_google_absl//absl/base:nullability",
         "@com_google_absl//absl/flags:flag",
         "@com_google_absl//absl/log",
         "@com_google_absl//absl/log:check",
@@ -248,6 +251,7 @@ cc_library(
         ":logging",
         ":remote_file",
         "@com_google_absl//absl/base:core_headers",
+        "@com_google_absl//absl/base:nullability",
         "@com_google_absl//absl/log:check",
         "@com_google_absl//absl/strings",
         "@com_google_absl//absl/strings:str_format",
@@ -295,6 +299,7 @@ cc_library(
         ":logging",
         ":remote_file",
         ":util",
+        "@com_google_absl//absl/base:nullability",
         "@com_google_absl//absl/flags:flag",
         "@com_google_absl//absl/flags:parse",
         "@com_google_absl//absl/flags:reflection",
@@ -321,6 +326,7 @@ cc_library(
     hdrs = ["rusage_stats.h"],
     visibility = ["//visibility:public"],
     deps = [
+        "@com_google_absl//absl/base:nullability",
         "@com_google_absl//absl/log:check",
         "@com_google_absl//absl/strings",
         "@com_google_absl//absl/strings:str_format",
@@ -336,6 +342,7 @@ cc_library(
     deps = [
         ":rusage_stats",
         "@com_google_absl//absl/base:core_headers",
+        "@com_google_absl//absl/base:nullability",
         "@com_google_absl//absl/log",
         "@com_google_absl//absl/log:check",
         "@com_google_absl//absl/strings",
@@ -443,6 +450,7 @@ cc_library(
     hdrs = ["shared_memory_blob_sequence.h"],
     linkopts = ["-lrt"],  # for shm_open.
     visibility = PUBLIC_API_VISIBILITY,
+    deps = ["@com_google_absl//absl/base:nullability"],
     # don't add any dependencies.
 )
 
@@ -509,6 +517,7 @@ cc_library(
         ":execution_metadata",
         ":knobs",
         ":mutation_input",
+        "@com_google_absl//absl/base:nullability",
     ],
 )
 
@@ -594,6 +603,7 @@ cc_library(
         ":defs",
         ":logging",
         "@com_google_absl//absl/base:core_headers",
+        "@com_google_absl//absl/base:nullability",
         "@com_google_absl//absl/log",
         "@com_google_absl//absl/log:check",
     ] + select({
@@ -708,6 +718,7 @@ cc_library(
         ":shared_memory_blob_sequence",
         ":util",
         ":workdir",
+        "@com_google_absl//absl/base:nullability",
         "@com_google_absl//absl/log",
         "@com_google_absl//absl/log:check",
         "@com_google_absl//absl/strings",
@@ -796,6 +807,7 @@ cc_library(
         ":util",
         ":workdir",
         "@com_google_absl//absl/base:core_headers",
+        "@com_google_absl//absl/base:nullability",
         "@com_google_absl//absl/container:flat_hash_set",
         "@com_google_absl//absl/log",
         "@com_google_absl//absl/log:check",
@@ -940,6 +952,7 @@ cc_library(
     name = "runner_fork_server",
     srcs = ["runner_fork_server.cc"],
     visibility = PUBLIC_API_VISIBILITY,
+    deps = ["@com_google_absl//absl/base:nullability"],
     alwayslink = 1,  # Otherwise the linker drops the fork server.
 )
 
@@ -1045,7 +1058,7 @@ cc_library(
     linkopts = RUNNER_LINKOPTS,
     linkstatic = True,  # Must be linked statically even when dynamic_mode=on.
     visibility = ["//visibility:public"],
-    deps = RUNNER_DEPS,
+    deps = RUNNER_DEPS + ["@com_google_absl//absl/base:nullability"],
 )
 
 # Same as :centipede_runner_no_main but as a DSO. Experimental.
@@ -1056,7 +1069,7 @@ cc_binary(
     linkopts = RUNNER_LINKOPTS,
     linkshared = 1,
     visibility = ["//visibility:public"],
-    deps = RUNNER_DEPS,
+    deps = RUNNER_DEPS + ["@com_google_absl//absl/base:nullability"],
 )
 
 # A full self-contained library archive that external clients should link to
@@ -1069,7 +1082,7 @@ cc_library(
     linkopts = RUNNER_LINKOPTS,
     linkstatic = True,  # Must be linked statically even when dynamic_mode=on.
     visibility = ["//visibility:public"],
-    deps = RUNNER_DEPS,
+    deps = RUNNER_DEPS + ["@com_google_absl//absl/base:nullability"],
 )
 
 # Utilities for seed corpus generation.
@@ -1274,6 +1287,7 @@ cc_test(
     deps = [
         ":logging",
         ":rusage_stats",
+        "@com_google_absl//absl/base:nullability",
         "@com_google_absl//absl/flags:flag",
         "@com_google_absl//absl/log",
         "@com_google_absl//absl/synchronization",
@@ -1347,6 +1361,7 @@ cc_test(
         ":test_util",
         ":util",
         ":workdir",
+        "@com_google_absl//absl/base:nullability",
         "@com_google_googletest//:gtest_main",
     ],
 )
@@ -1496,6 +1511,7 @@ cc_test(
     deps = [
         ":callstack",
         ":defs",
+        "@com_google_absl//absl/base:nullability",
         "@com_google_absl//absl/container:flat_hash_set",
         "@com_google_googletest//:gtest_main",
     ],
@@ -1530,7 +1546,10 @@ cc_test(
 cc_binary(
     name = "command_test_helper",
     srcs = ["command_test_helper.cc"],
-    deps = [":runner_fork_server"],
+    deps = [
+        ":runner_fork_server",
+        "@com_google_absl//absl/base:nullability",
+    ],
 )
 
 cc_test(
@@ -1554,6 +1573,7 @@ cc_test(
     srcs = ["runner_cmp_trace_test.cc"],
     deps = [
         ":runner_cmp_trace",
+        "@com_google_absl//absl/base:nullability",
         "@com_google_googletest//:gtest_main",
     ],
 )
@@ -1651,6 +1671,7 @@ cc_test(
         ":test_util",
         ":util",
         ":workdir",
+        "@com_google_absl//absl/base:nullability",
         "@com_google_absl//absl/container:flat_hash_set",
         "@com_google_absl//absl/log",
         "@com_google_absl//absl/log:check",

centipede/batch_fuzz_example/BUILD

@@ -58,6 +58,7 @@ cc_binary(
     srcs = ["customized_centipede_main.cc"],
     deps = [
         ":customized_centipede_lib",
+        "@com_google_absl//absl/base:nullability",
         "@com_google_fuzztest//centipede:centipede_callbacks",
         "@com_google_fuzztest//centipede:centipede_interface",
         "@com_google_fuzztest//centipede:config_file",

centipede/batch_fuzz_example/customized_centipede_main.cc

@@ -12,13 +12,14 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include "absl/base/nullability.h"
 #include "./centipede/batch_fuzz_example/customized_centipede.h"
 #include "./centipede/centipede_callbacks.h"
 #include "./centipede/centipede_interface.h"
 #include "./centipede/config_file.h"
 #include "./centipede/environment_flags.h"
 
-int main(int argc, char** argv) {
+int main(int argc, absl::Nonnull<char**> argv) {
   const auto leftover_argv = centipede::config::InitCentipede(argc, argv);
 
   // Reads flags; must happen after ParseCommandLine().

centipede/blob_file_converter.cc

@@ -17,6 +17,7 @@
 #include <filesystem>  // NOLINT
 #include <string>
 
+#include "absl/base/nullability.h"
 #include "absl/flags/flag.h"
 #include "absl/log/check.h"
 #include "absl/log/log.h"
@@ -133,7 +134,7 @@ void Convert(               //
 }  // namespace
 }  // namespace centipede
 
-int main(int argc, char** argv) {
+int main(int argc, absl::Nonnull<char**> argv) {
   (void)centipede::config::InitRuntime(argc, argv);
 
   const std::string in = absl::GetFlag(FLAGS_in);

centipede/byte_array_mutator.h

@@ -22,6 +22,7 @@
 #include <utility>
 #include <vector>
 
+#include "absl/base/nullability.h"
 #include "./centipede/defs.h"
 #include "./centipede/execution_metadata.h"
 #include "./centipede/knobs.h"
@@ -40,7 +41,7 @@ class DictEntry {
     if (size_ > kMaxEntrySize) __builtin_trap();
     memcpy(bytes_, bytes.data(), bytes.size());
   }
-  const uint8_t *begin() const { return bytes_; }
+  absl::Nonnull<const uint8_t *> begin() const { return bytes_; }
   const uint8_t *end() const { return bytes_ + size_; }
   size_t size() const { return size_; }
   bool operator<(const DictEntry &other) const {

centipede/callstack_test.cc

@@ -22,6 +22,7 @@
 
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"
+#include "absl/base/nullability.h"
 #include "absl/container/flat_hash_set.h"
 #include "./centipede/defs.h"
 
@@ -76,7 +77,7 @@ static void RecordCallStack() {
       PC, reinterpret_cast<uintptr_t>(__builtin_frame_address(0)))
 
 // Don't let the compiler be too smart.
-static inline void BreakOptimization(const void *arg) {
+static inline void BreakOptimization(absl::Nullable<const void *> arg) {
   __asm__ __volatile__("" : : "r"(arg) : "memory");
 }
 

centipede/centipede.cc

@@ -60,6 +60,7 @@
 
 #include "absl/base/attributes.h"
 #include "absl/base/const_init.h"  // NOLINT
+#include "absl/base/nullability.h"
 #include "absl/container/flat_hash_set.h"
 #include "absl/log/check.h"
 #include "absl/log/log.h"
@@ -342,10 +343,11 @@ size_t Centipede::AddPcPairFeatures(FeatureVec &fv) {
   return num_added_pairs;
 }
 
-bool Centipede::RunBatch(const std::vector<ByteArray> &input_vec,
-                         BlobFileWriter *corpus_file,
-                         BlobFileWriter *features_file,
-                         BlobFileWriter *unconditional_features_file) {
+bool Centipede::RunBatch(
+    const std::vector<ByteArray> &input_vec,
+    absl::Nullable<BlobFileWriter *> corpus_file,
+    absl::Nullable<BlobFileWriter *> features_file,
+    absl::Nullable<BlobFileWriter *> unconditional_features_file) {
   BatchResult batch_result;
   bool success = ExecuteAndReportCrash(env_.binary, input_vec, batch_result);
   CHECK_EQ(input_vec.size(), batch_result.results().size());

centipede/centipede.h

@@ -1,4 +1,3 @@
-#include "./centipede/binary_info.h"
 // Copyright 2022 The Centipede Authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
@@ -21,7 +20,9 @@
 #include <string_view>
 #include <vector>
 
+#include "absl/base/nullability.h"
 #include "absl/time/time.h"
+#include "./centipede/binary_info.h"
 #include "./centipede/blob_file.h"
 #include "./centipede/centipede_callbacks.h"
 #include "./centipede/command.h"
@@ -77,8 +78,9 @@ class Centipede {
   // Returns true if new features were observed.
   // Post-condition: `batch_result.results.size()` == `input_vec.size()`.
   bool RunBatch(const std::vector<ByteArray> &input_vec,
-                BlobFileWriter *corpus_file, BlobFileWriter *features_file,
-                BlobFileWriter *unconditional_features_file);
+                absl::Nullable<BlobFileWriter *> corpus_file,
+                absl::Nullable<BlobFileWriter *> features_file,
+                absl::Nullable<BlobFileWriter *> unconditional_features_file);
   // Loads seed inputs from the user callbacks.
   void LoadSeedInputs();
   // Loads a shard `shard_index` from `load_env.workdir`.

centipede/centipede_callbacks.h

@@ -21,6 +21,7 @@
 #include <string_view>
 #include <vector>
 
+#include "absl/base/nullability.h"
 #include "absl/log/check.h"
 #include "./centipede/binary_info.h"
 #include "./centipede/byte_array_mutator.h"
@@ -198,7 +199,7 @@ class ScopedCentipedeCallbacks {
                            const Environment &env)
       : factory_(factory), callbacks_(factory_.create(env)) {}
   ~ScopedCentipedeCallbacks() { factory_.destroy(callbacks_); }
-  CentipedeCallbacks *callbacks() { return callbacks_; }
+  absl::Nonnull<CentipedeCallbacks *> callbacks() { return callbacks_; }
 
  private:
   CentipedeCallbacksFactory &factory_;

centipede/centipede_main.cc

@@ -12,13 +12,14 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include "absl/base/nullability.h"
 #include "./centipede/centipede_callbacks.h"
 #include "./centipede/centipede_default_callbacks.h"
 #include "./centipede/centipede_interface.h"
 #include "./centipede/config_file.h"
 #include "./centipede/environment_flags.h"
 
-int main(int argc, char** argv) {
+int main(int argc, absl::Nonnull<char**> argv) {
   const auto leftover_argv = centipede::config::InitCentipede(argc, argv);
 
   const auto env = centipede::CreateEnvironmentFromFlags(leftover_argv);

centipede/centipede_test.cc

@@ -26,6 +26,7 @@
 
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"
+#include "absl/base/nullability.h"
 #include "absl/container/flat_hash_set.h"
 #include "absl/log/check.h"
 #include "absl/log/log.h"
@@ -124,7 +125,9 @@ class CentipedeMock : public CentipedeCallbacks {
 class MockFactory : public CentipedeCallbacksFactory {
  public:
   explicit MockFactory(CentipedeCallbacks &cb) : cb_(cb) {}
-  CentipedeCallbacks *create(const Environment &env) override { return &cb_; }
+  absl::Nonnull<CentipedeCallbacks *> create(const Environment &env) override {
+    return &cb_;
+  }
   void destroy(CentipedeCallbacks *cb) override { EXPECT_EQ(cb, &cb_); }
 
  private:

centipede/command_test_helper.cc

@@ -19,8 +19,10 @@
 #include <cstdlib>
 #include <cstring>
 
+#include "absl/base/nullability.h"
+
 // A binary linked with the fork server that exits/crashes in different ways.
-int main(int argc, char **argv) {
+int main(int argc, absl::Nonnull<char **> argv) {
   assert(argc == 2);
   printf("Got input: %s", argv[1]);
   fflush(stdout);

centipede/config_file.cc

@@ -22,6 +22,7 @@
 #include <utility>
 #include <vector>
 
+#include "absl/base/nullability.h"
 #include "absl/flags/declare.h"
 #include "absl/flags/flag.h"
 #include "absl/flags/parse.h"
@@ -230,7 +231,7 @@ set -x
   return path;
 }
 
-std::vector<std::string> InitCentipede(int argc, char** argv) {
+std::vector<std::string> InitCentipede(int argc, absl::Nonnull<char**> argv) {
   std::vector<std::string> leftover_argv;
 
   // main_runtime_init() is allowed to remove recognized flags from `argv`, so