[clang-proto-fuzzer] Refactored LLVMFuzzerInitialize into its own file.

Copied and renamed some files in preparation for new loop-proto-fuzzer.

Patch By: emmettneyman

Differential Revision: https://reviews.llvm.org/D47666

llvm-svn: 333969

clang/tools/clang-fuzzer/CMakeLists.txt

@@ -40,6 +40,9 @@ if(CLANG_ENABLE_PROTO_FUZZER)
   # Build the protobuf->C++ translation library and driver.
   add_clang_subdirectory(proto-to-cxx)
 
+  # Build the fuzzer initialization library.
+  add_clang_subdirectory(fuzzer-initialize)
+
   # Build the protobuf fuzzer
   add_clang_executable(clang-proto-fuzzer
     ${DUMMY_MAIN}
@@ -52,6 +55,7 @@ if(CLANG_ENABLE_PROTO_FUZZER)
     ${PROTOBUF_LIBRARIES}
     ${LLVM_LIB_FUZZING_ENGINE}
     clangCXXProto
+    clangFuzzerInitialize
     clangHandleCXX
     clangProtoToCXX
     )

clang/tools/clang-fuzzer/ExampleClangProtoFuzzer.cpp

@@ -17,28 +17,12 @@
 #include "cxx_proto.pb.h"
 #include "handle-cxx/handle_cxx.h"
 #include "proto-to-cxx/proto_to_cxx.h"
-
+#include "fuzzer-initialize/fuzzer_initialize.h"
 #include "src/libfuzzer/libfuzzer_macro.h"
 
-#include <cstring>
-
 using namespace clang_fuzzer;
 
-static std::vector<const char *> CLArgs;
-
-extern "C" int LLVMFuzzerInitialize(int *argc, char ***argv) {
-  CLArgs.push_back("-O2");
-  for (int I = 1; I < *argc; I++) {
-    if (strcmp((*argv)[I], "-ignore_remaining_args=1") == 0) {
-      for (I++; I < *argc; I++)
-        CLArgs.push_back((*argv)[I]);
-      break;
-    }
-  }
-  return 0;
-}
-
 DEFINE_BINARY_PROTO_FUZZER(const Function& input) {
   auto S = FunctionToString(input);
-  HandleCXX(S, CLArgs);
+  HandleCXX(S, GetCLArgs());
 }

clang/tools/clang-fuzzer/fuzzer-initialize/CMakeLists.txt

@@ -0,0 +1,3 @@
+set(LLVM_LINK_COMPONENTS ${LLVM_TARGETS_TO_BUILD} Support)
+
+add_clang_library(clangFuzzerInitialize fuzzer_initialize.cpp)

clang/tools/clang-fuzzer/fuzzer-initialize/fuzzer_initialize.cpp

@@ -0,0 +1,43 @@
+//===-- fuzzer_initialize.cpp - Fuzz Clang --------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file implements two functions: one that returns the command line
+/// arguments for a given call to the fuzz target and one that initializes
+/// the fuzzer with the correct command line arguments.
+///
+//===----------------------------------------------------------------------===//
+
+#include "fuzzer_initialize.h"
+#include <cstring>
+
+using namespace clang_fuzzer;
+
+
+namespace clang_fuzzer {
+
+static std::vector<const char *> CLArgs;
+
+const std::vector<const char *>& GetCLArgs() {
+  return CLArgs;
+}
+
+}
+
+extern "C" int LLVMFuzzerInitialize(int *argc, char ***argv) {
+  CLArgs.push_back("-O2");
+  for (int I = 1; I < *argc; I++) {
+    if (strcmp((*argv)[I], "-ignore_remaining_args=1") == 0) {
+      for (I++; I < *argc; I++)
+        CLArgs.push_back((*argv)[I]);
+      break;
+    }
+  }
+  return 0;
+}

clang/tools/clang-fuzzer/fuzzer-initialize/fuzzer_initialize.h

@@ -0,0 +1,19 @@
+//==-- fuzzer_initialize.h - Fuzz Clang ------------------------------------==//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Defines a function that returns the command line arguments for a specific
+// call to the fuzz target.
+//
+//===----------------------------------------------------------------------===//
+
+#include <vector>
+
+namespace clang_fuzzer {
+const std::vector<const char *>& GetCLArgs();
+}