gcc/libsanitizer/sanitizer_common/sanitizer_win_defs.h

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ubsan.c (ubsan_expand_null_ifn): Use _v1 suffixed type mismatch builtins... * ubsan.c (ubsan_expand_null_ifn): Use _v1 suffixed type mismatch builtins, store max (log2 (align), 0) into uchar field instead of align into uptr field. (ubsan_expand_objsize_ifn): Use _v1 suffixed type mismatch builtins, store uchar 0 field instead of uptr 0 field. (instrument_nonnull_return): Use _v1 suffixed nonnull return builtin, instead of passing one address of struct with 2 locations pass two addresses of structs with 1 location each. * sanitizer.def (BUILT_IN_UBSAN_HANDLE_TYPE_MISMATCH, BUILT_IN_UBSAN_HANDLE_TYPE_MISMATCH_ABORT, BUILT_IN_UBSAN_HANDLE_NONNULL_RETURN, BUILT_IN_UBSAN_HANDLE_NONNULL_RETURN_ABORT): Removed. (BUILT_IN_UBSAN_HANDLE_TYPE_MISMATCH_V1, BUILT_IN_UBSAN_HANDLE_TYPE_MISMATCH_V1_ABORT, BUILT_IN_UBSAN_HANDLE_NONNULL_RETURN_V1, BUILT_IN_UBSAN_HANDLE_NONNULL_RETURN_V1_ABORT): New builtins. * c-c++-common/ubsan/float-cast-overflow-1.c: Drop value keyword from expected output regexps. * c-c++-common/ubsan/float-cast-overflow-2.c: Likewise. * c-c++-common/ubsan/float-cast-overflow-3.c: Likewise. * c-c++-common/ubsan/float-cast-overflow-4.c: Likewise. * c-c++-common/ubsan/float-cast-overflow-5.c: Likewise. * c-c++-common/ubsan/float-cast-overflow-6.c: Likewise. * c-c++-common/ubsan/float-cast-overflow-8.c: Likewise. * c-c++-common/ubsan/float-cast-overflow-9.c: Likewise. * c-c++-common/ubsan/float-cast-overflow-10.c: Likewise. * g++.dg/ubsan/float-cast-overflow-bf.C: Likewise. * gcc.dg/ubsan/float-cast-overflow-bf.c: Likewise. * g++.dg/asan/default-options-1.C (__asan_default_options): Add used attribute. * g++.dg/asan/asan_test.C: Run with ASAN_OPTIONS=handle_segv=2 in the environment. * All source files: Merge from upstream 315899. * asan/Makefile.am (nodist_saninclude_HEADERS): Add include/sanitizer/tsan_interface.h. * asan/libtool-version: Bump the libasan SONAME. * lsan/Makefile.am (sanitizer_lsan_files): Add lsan_common_mac.cc. (lsan_files): Add lsan_linux.cc, lsan_mac.cc and lsan_malloc_mac.cc. * sanitizer_common/Makefile.am (sanitizer_common_files): Add sancov_flags.cc, sanitizer_allocator_checks.cc, sanitizer_coverage_libcdep_new.cc, sanitizer_errno.cc, sanitizer_file.cc, sanitizer_mac_libcdep.cc and sanitizer_stoptheworld_mac.cc. Remove sanitizer_coverage_libcdep.cc and sanitizer_coverage_mapping_libcdep.cc. * tsan/Makefile.am (tsan_files): Add tsan_external.cc. * ubsan/Makefile.am (DEFS): Add -DUBSAN_CAN_USE_CXXABI=1. (ubsan_files): Add ubsan_init_standalone.cc and ubsan_signals_standalone.cc. * ubsan/libtool-version: Bump the libubsan SONAME. * asan/Makefile.in: Regenerate. * lsan/Makefile.in: Regenerate. * sanitizer_common/Makefile.in: Regenerate. * tsan/Makefile.in: Regenerate. * ubsan/Makefile.in: Regenerate. From-SVN: r253887
2017-10-19 13:23:59 +02:00
//===-- sanitizer_win_defs.h ------------------------------------*- C++ -*-===//
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Common definitions for Windows-specific code.
//
//===----------------------------------------------------------------------===//
#ifndef SANITIZER_WIN_DEFS_H
#define SANITIZER_WIN_DEFS_H
#include "sanitizer_platform.h"
#if SANITIZER_WINDOWS
#ifndef WINAPI
#ifdef _M_IX86
#define WINAPI __stdcall
#else
#define WINAPI
#endif
#endif
#if defined(_WIN64)
#define WIN_SYM_PREFIX
#else
#define WIN_SYM_PREFIX "_"
#endif
// Intermediate macro to ensure the parameter is expanded before stringified.
#define STRINGIFY_(A) #A
#define STRINGIFY(A) STRINGIFY_(A)
// ----------------- A workaround for the absence of weak symbols --------------
// We don't have a direct equivalent of weak symbols when using MSVC, but we can
// use the /alternatename directive to tell the linker to default a specific
// symbol to a specific value.
// Take into account that this is a pragma directive for the linker, so it will
// be ignored by the compiler and the function will be marked as UNDEF in the
// symbol table of the resulting object file. The linker won't find the default
// implementation until it links with that object file.
// So, suppose we provide a default implementation "fundef" for "fun", and this
// is compiled into the object file "test.obj" including the pragma directive.
// If we have some code with references to "fun" and we link that code with
// "test.obj", it will work because the linker always link object files.
// But, if "test.obj" is included in a static library, like "test.lib", then the
// liker will only link to "test.obj" if necessary. If we only included the
// definition of "fun", it won't link to "test.obj" (from test.lib) because
// "fun" appears as UNDEF, so it doesn't resolve the symbol "fun", and will
// result in a link error (the linker doesn't find the pragma directive).
// So, a workaround is to force linkage with the modules that include weak
// definitions, with the following macro: WIN_FORCE_LINK()
#define WIN_WEAK_ALIAS(Name, Default) \
__pragma(comment(linker, "/alternatename:" WIN_SYM_PREFIX STRINGIFY(Name) "="\
WIN_SYM_PREFIX STRINGIFY(Default)))
#define WIN_FORCE_LINK(Name) \
__pragma(comment(linker, "/include:" WIN_SYM_PREFIX STRINGIFY(Name)))
#define WIN_EXPORT(ExportedName, Name) \
__pragma(comment(linker, "/export:" WIN_SYM_PREFIX STRINGIFY(ExportedName) \
"=" WIN_SYM_PREFIX STRINGIFY(Name)))
// We cannot define weak functions on Windows, but we can use WIN_WEAK_ALIAS()
// which defines an alias to a default implementation, and only works when
// linking statically.
// So, to define a weak function "fun", we define a default implementation with
// a different name "fun__def" and we create a "weak alias" fun = fun__def.
// Then, users can override it just defining "fun".
// We impose "extern "C"" because otherwise WIN_WEAK_ALIAS() will fail because
// of name mangling.
// Dummy name for default implementation of weak function.
# define WEAK_DEFAULT_NAME(Name) Name##__def
// Name for exported implementation of weak function.
# define WEAK_EXPORT_NAME(Name) Name##__dll
// Use this macro when you need to define and export a weak function from a
// library. For example:
// WIN_WEAK_EXPORT_DEF(bool, compare, int a, int b) { return a > b; }
# define WIN_WEAK_EXPORT_DEF(ReturnType, Name, ...) \
WIN_WEAK_ALIAS(Name, WEAK_DEFAULT_NAME(Name)) \
WIN_EXPORT(WEAK_EXPORT_NAME(Name), Name) \
extern "C" ReturnType Name(__VA_ARGS__); \
extern "C" ReturnType WEAK_DEFAULT_NAME(Name)(__VA_ARGS__)
// Use this macro when you need to import a weak function from a library. It
// defines a weak alias to the imported function from the dll. For example:
// WIN_WEAK_IMPORT_DEF(compare)
# define WIN_WEAK_IMPORT_DEF(Name) \
WIN_WEAK_ALIAS(Name, WEAK_EXPORT_NAME(Name))
// So, for Windows we provide something similar to weak symbols in Linux, with
// some differences:
// + A default implementation must always be provided.
//
// + When linking statically it works quite similarly. For example:
//
// // libExample.cc
// WIN_WEAK_EXPORT_DEF(bool, compare, int a, int b) { return a > b; }
//
// // client.cc
// // We can use the default implementation from the library:
// compare(1, 2);
// // Or we can override it:
// extern "C" bool compare (int a, int b) { return a >= b; }
//
// And it will work fine. If we don't override the function, we need to ensure
// that the linker includes the object file with the default implementation.
// We can do so with the linker option "-wholearchive:".
//
// + When linking dynamically with a library (dll), weak functions are exported
// with "__dll" suffix. Clients can use the macro WIN_WEAK_IMPORT_DEF(fun)
// which defines a "weak alias" fun = fun__dll.
//
// // libExample.cc
// WIN_WEAK_EXPORT_DEF(bool, compare, int a, int b) { return a > b; }
//
// // client.cc
// WIN_WEAK_IMPORT_DEF(compare)
// // We can use the default implementation from the library:
// compare(1, 2);
// // Or we can override it:
// extern "C" bool compare (int a, int b) { return a >= b; }
//
// But if we override the function, the dlls don't have access to it (which
// is different in linux). If that is desired, the strong definition must be
// exported and interception can be used from the rest of the dlls.
//
// // libExample.cc
// WIN_WEAK_EXPORT_DEF(bool, compare, int a, int b) { return a > b; }
// // When initialized, check if the main executable defined "compare".
// int libExample_init() {
// uptr fnptr = __interception::InternalGetProcAddress(
// (void *)GetModuleHandleA(0), "compare");
// if (fnptr && !__interception::OverrideFunction((uptr)compare, fnptr, 0))
// abort();
// return 0;
// }
//
// // client.cc
// WIN_WEAK_IMPORT_DEF(compare)
// // We override and export compare:
// extern "C" __declspec(dllexport) bool compare (int a, int b) {
// return a >= b;
// }
//
#endif // SANITIZER_WINDOWS
#endif // SANITIZER_WIN_DEFS_H