Move libFuzzer to compiler_rt.
Resulting library binaries will be named libclang_rt.fuzzer*, and will
be placed in Clang toolchain, allowing redistribution.
Differential Revision: https://reviews.llvm.org/D36908
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk/lib/fuzzer@311407 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/FuzzerExtFunctionsWeakAlias.cpp b/FuzzerExtFunctionsWeakAlias.cpp
new file mode 100644
index 0000000..e10f7b4
--- /dev/null
+++ b/FuzzerExtFunctionsWeakAlias.cpp
@@ -0,0 +1,56 @@
+//===- FuzzerExtFunctionsWeakAlias.cpp - Interface to external functions --===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// Implementation using weak aliases. Works for Windows.
+//===----------------------------------------------------------------------===//
+#include "FuzzerDefs.h"
+#if LIBFUZZER_WINDOWS
+
+#include "FuzzerExtFunctions.h"
+#include "FuzzerIO.h"
+
+using namespace fuzzer;
+
+extern "C" {
+// Declare these symbols as weak to allow them to be optionally defined.
+#define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
+ RETURN_TYPE NAME##Def FUNC_SIG { \
+ Printf("ERROR: Function \"%s\" not defined.\n", #NAME); \
+ exit(1); \
+ } \
+ RETURN_TYPE NAME FUNC_SIG __attribute__((weak, alias(#NAME "Def")));
+
+#include "FuzzerExtFunctions.def"
+
+#undef EXT_FUNC
+}
+
+template <typename T>
+static T *GetFnPtr(T *Fun, T *FunDef, const char *FnName, bool WarnIfMissing) {
+ if (Fun == FunDef) {
+ if (WarnIfMissing)
+ Printf("WARNING: Failed to find function \"%s\".\n", FnName);
+ return nullptr;
+ }
+ return Fun;
+}
+
+namespace fuzzer {
+
+ExternalFunctions::ExternalFunctions() {
+#define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
+ this->NAME = GetFnPtr<decltype(::NAME)>(::NAME, ::NAME##Def, #NAME, WARN);
+
+#include "FuzzerExtFunctions.def"
+
+#undef EXT_FUNC
+}
+
+} // namespace fuzzer
+
+#endif // LIBFUZZER_WINDOWS