llvm/lib/Fuzzer/FuzzerExtFunctions.h
Dan Liew 1a1c8bea2d [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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@272072 91177308-0d34-0410-b5e6-96231b3b80d8
2016-06-07 23:32:50 +00:00

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//===- FuzzerExtFunctions.h - Interface to external functions ---*- C++ -* ===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// Defines an interface to (possibly optional) functions.
//===----------------------------------------------------------------------===//
#ifndef LLVM_FUZZER_EXT_FUNCTIONS_H
#define LLVM_FUZZER_EXT_FUNCTIONS_H
#include <stddef.h>
#include <stdint.h>
namespace fuzzer {
struct ExternalFunctions {
// Initialize function pointers. Functions that are not available will be set
// to nullptr. Do not call this constructor before ``main()`` has been
// entered.
ExternalFunctions();
#define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
RETURN_TYPE(*NAME) FUNC_SIG = nullptr
#include "FuzzerExtFunctions.def"
#undef EXT_FUNC
};
} // namespace fuzzer
#endif