d54953ef47
The `check-fuzzer` runs fine with cl build llvm, but the following lit tests fail with clang-cl build llvm ``` ******************** Timed Out Tests (2): libFuzzer-x86_64-default-Windows :: fork-ubsan.test libFuzzer-x86_64-default-Windows :: fuzzer-oom.test ******************** Failed Tests (22): libFuzzer-x86_64-default-Windows :: acquire-crash-state.test libFuzzer-x86_64-default-Windows :: cross_over_copy.test libFuzzer-x86_64-default-Windows :: cross_over_insert.test libFuzzer-x86_64-default-Windows :: exit_on_src_pos.test libFuzzer-x86_64-default-Windows :: fuzzer-alignment-assumption.test libFuzzer-x86_64-default-Windows :: fuzzer-implicit-integer-sign-change.test libFuzzer-x86_64-default-Windows :: fuzzer-implicit-signed-integer-truncation-or-sign-change.test libFuzzer-x86_64-default-Windows :: fuzzer-implicit-signed-integer-truncation.test libFuzzer-x86_64-default-Windows :: fuzzer-implicit-unsigned-integer-truncation.test libFuzzer-x86_64-default-Windows :: fuzzer-printcovpcs.test libFuzzer-x86_64-default-Windows :: fuzzer-timeout.test libFuzzer-x86_64-default-Windows :: fuzzer-ubsan.test libFuzzer-x86_64-default-Windows :: minimize_crash.test libFuzzer-x86_64-default-Windows :: minimize_two_crashes.test libFuzzer-x86_64-default-Windows :: null-deref-on-empty.test libFuzzer-x86_64-default-Windows :: null-deref.test libFuzzer-x86_64-default-Windows :: print-func.test libFuzzer-x86_64-default-Windows :: stack-overflow-with-asan.test libFuzzer-x86_64-default-Windows :: trace-malloc-2.test libFuzzer-x86_64-default-Windows :: trace-malloc-unbalanced.test libFuzzer-x86_64-default-Windows :: trace-malloc.test ``` The related commits are53a81d4d26ande31efd8f6f. Following the change ine31efd8f6fcan fix these failures. As for the issue mentioned in the comment that alternatename support in clang not good enough(https://bugs.llvm.org/show_bug.cgi?id=40218). I find that using `__builtin_function_start(func)` instead of directly using `func` would make it work as intended.
83 lines
2.7 KiB
C++
83 lines
2.7 KiB
C++
//=== FuzzerExtWindows.cpp - Interface to external functions --------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// Implementation of FuzzerExtFunctions for Windows. Uses alternatename when
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// compiled with MSVC. Uses weak aliases when compiled with clang. Unfortunately
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// the method each compiler supports is not supported by the other.
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//===----------------------------------------------------------------------===//
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#include "FuzzerPlatform.h"
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#if LIBFUZZER_WINDOWS
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#include "FuzzerExtFunctions.h"
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#include "FuzzerIO.h"
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using namespace fuzzer;
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// Intermediate macro to ensure the parameter is expanded before stringified.
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#define STRINGIFY_(A) #A
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#define STRINGIFY(A) STRINGIFY_(A)
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#if LIBFUZZER_MSVC
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#define GET_FUNCTION_ADDRESS(fn) &fn
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#else
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#define GET_FUNCTION_ADDRESS(fn) __builtin_function_start(fn)
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#endif // LIBFUZER_MSVC
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// Copied from compiler-rt/lib/sanitizer_common/sanitizer_win_defs.h
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#if defined(_M_IX86) || defined(__i386__)
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#define WIN_SYM_PREFIX "_"
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#else
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#define WIN_SYM_PREFIX
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#endif
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// Declare external functions as having alternativenames, so that we can
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// determine if they are not defined.
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#define EXTERNAL_FUNC(Name, Default) \
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__pragma(comment(linker, "/alternatename:" WIN_SYM_PREFIX STRINGIFY( \
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Name) "=" WIN_SYM_PREFIX STRINGIFY(Default)))
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extern "C" {
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#define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
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RETURN_TYPE NAME##Def FUNC_SIG { \
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Printf("ERROR: Function \"%s\" not defined.\n", #NAME); \
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exit(1); \
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} \
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EXTERNAL_FUNC(NAME, NAME##Def) RETURN_TYPE NAME FUNC_SIG
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#include "FuzzerExtFunctions.def"
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#undef EXT_FUNC
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}
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template <typename T>
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static T *GetFnPtr(void *Fun, void *FunDef, const char *FnName,
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bool WarnIfMissing) {
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if (Fun == FunDef) {
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if (WarnIfMissing)
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Printf("WARNING: Failed to find function \"%s\".\n", FnName);
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return nullptr;
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}
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return (T *)Fun;
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}
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namespace fuzzer {
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ExternalFunctions::ExternalFunctions() {
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#define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
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this->NAME = GetFnPtr<decltype(::NAME)>(GET_FUNCTION_ADDRESS(::NAME), \
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GET_FUNCTION_ADDRESS(::NAME##Def), \
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#NAME, WARN);
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#include "FuzzerExtFunctions.def"
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#undef EXT_FUNC
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}
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} // namespace fuzzer
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#endif // LIBFUZZER_WINDOWS
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