[LibFuzzer] Declare and use sanitizer functions in ``fuzzer::ExternalFunctions``
This fixes linking problems on OSX.
Unfortunately it turns out we need to use an instance of the
``fuzzer::ExternalFunctions`` object in several places so this
commit also replaces all instances with a single global instance.
It also turns out initializing a global ``fuzzer::ExternalFunctions``
before main is entered (i.e. letting the object be initialised by the
global initializers) is not safe (on OSX the call to ``Printf()`` in the
CTOR crashes if it is called from a global initializer) so we instead
have a global ``fuzzer::ExternalFunctions*`` and initialize it inside
``FuzzerDriver()``.
Multiple unit tests depend also depend on the
``fuzzer::ExternalFunctions*`` global so a ``main()`` function has been
added that initializes it before running any tests.
Differential Revision: http://reviews.llvm.org/D20943
llvm-svn: 272072
diff --git a/llvm/lib/Fuzzer/FuzzerIO.cpp b/llvm/lib/Fuzzer/FuzzerIO.cpp
index 171b188..0e0c4e9 100644
--- a/llvm/lib/Fuzzer/FuzzerIO.cpp
+++ b/llvm/lib/Fuzzer/FuzzerIO.cpp
@@ -8,6 +8,7 @@
//===----------------------------------------------------------------------===//
// IO functions.
//===----------------------------------------------------------------------===//
+#include "FuzzerExtFunctions.h"
#include "FuzzerInternal.h"
#include <iterator>
#include <fstream>
@@ -18,10 +19,6 @@
#include <cstdarg>
#include <cstdio>
-extern "C" {
-__attribute__((weak)) void __sanitizer_set_report_fd(void *);
-}
-
namespace fuzzer {
static FILE *OutputFile = stderr;
@@ -126,8 +123,8 @@
FILE *NewOutputFile = fdopen(OutputFd, "w");
if (NewOutputFile) {
OutputFile = NewOutputFile;
- if (__sanitizer_set_report_fd)
- __sanitizer_set_report_fd(reinterpret_cast<void*>(OutputFd));
+ if (EF->__sanitizer_set_report_fd)
+ EF->__sanitizer_set_report_fd(reinterpret_cast<void *>(OutputFd));
close(2);
}
}