/// Does this instruction write some memory? This only returns true for things
/// that we can analyze with other helpers below.
static bool hasMemoryWrite(Instruction *I, const TargetLibraryInfo &TLI) {
if (isa<StoreInst>(I))
return true;
if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(I)) {
switch (II->getIntrinsicID()) {
default:
return false;
case Intrinsic::memset:
case Intrinsic::memmove:
case Intrinsic::memcpy:
case Intrinsic::init_trampoline:
case Intrinsic::lifetime_end:
return true;
}
}
if (auto CS = CallSite(I)) {
if (Function *F = CS.getCalledFunction()) {
StringRef FnName = F->getName();
if (TLI.has(LibFunc::strcpy) && FnName == TLI.getName(LibFunc::strcpy))
return true;
if (TLI.has(LibFunc::strncpy) && FnName == TLI.getName(LibFunc::strncpy))
return true;
if (TLI.has(LibFunc::strcat) && FnName == TLI.getName(LibFunc::strcat))
return true;
if (TLI.has(LibFunc::strncat) && FnName == TLI.getName(LibFunc::strncat))
return true;
}
}
return false;
}
// Collect names of runtime library functions. User-defined functions with the
// same names are added to llvm.compiler.used to prevent them from being
// deleted by optimizations.
static void accumulateAndSortLibcalls(std::vector<StringRef> &Libcalls,
const TargetLibraryInfo& TLI,
const Module &Mod,
const TargetMachine &TM) {
// TargetLibraryInfo has info on C runtime library calls on the current
// target.
for (unsigned I = 0, E = static_cast<unsigned>(LibFunc::NumLibFuncs);
I != E; ++I) {
LibFunc::Func F = static_cast<LibFunc::Func>(I);
if (TLI.has(F))
Libcalls.push_back(TLI.getName(F));
}
SmallPtrSet<const TargetLowering *, 1> TLSet;
for (const Function &F : Mod) {
const TargetLowering *Lowering =
TM.getSubtargetImpl(F)->getTargetLowering();
if (Lowering && TLSet.insert(Lowering).second)
// TargetLowering has info on library calls that CodeGen expects to be
// available, both from the C runtime and compiler-rt.
for (unsigned I = 0, E = static_cast<unsigned>(RTLIB::UNKNOWN_LIBCALL);
I != E; ++I)
if (const char *Name =
Lowering->getLibcallName(static_cast<RTLIB::Libcall>(I)))
Libcalls.push_back(Name);
}
array_pod_sort(Libcalls.begin(), Libcalls.end());
Libcalls.erase(std::unique(Libcalls.begin(), Libcalls.end()),
Libcalls.end());
}
static void accumulateAndSortLibcalls(std::vector<StringRef> &Libcalls,
const TargetLibraryInfo& TLI,
const TargetLowering *Lowering)
{
// TargetLibraryInfo has info on C runtime library calls on the current
// target.
for (unsigned I = 0, E = static_cast<unsigned>(LibFunc::NumLibFuncs);
I != E; ++I) {
LibFunc::Func F = static_cast<LibFunc::Func>(I);
if (TLI.has(F))
Libcalls.push_back(TLI.getName(F));
}
// TargetLowering has info on library calls that CodeGen expects to be
// available, both from the C runtime and compiler-rt.
if (Lowering)
for (unsigned I = 0, E = static_cast<unsigned>(RTLIB::UNKNOWN_LIBCALL);
I != E; ++I)
if (const char *Name
= Lowering->getLibcallName(static_cast<RTLIB::Libcall>(I)))
Libcalls.push_back(Name);
array_pod_sort(Libcalls.begin(), Libcalls.end());
Libcalls.erase(std::unique(Libcalls.begin(), Libcalls.end()),
Libcalls.end());
}
static void createLibraryFunction(llvm::LibFunc::Func funcId,
llvm::FunctionType *funcType, Module* module)
{
TargetLibraryInfo targetLib;
if (targetLib.has(funcId))
{
Function::Create(funcType, Function::ExternalLinkage,
targetLib.getName(funcId), module);
}
else
{
string msg = "native target does not have library function for ";
msg += targetLib.getName(funcId);
throw_llvm_exception(msg);
}
}
bool llvm::inferLibFuncAttributes(Function &F, const TargetLibraryInfo &TLI) {
LibFunc TheLibFunc;
if (!(TLI.getLibFunc(F, TheLibFunc) && TLI.has(TheLibFunc)))
return false;
bool Changed = false;
switch (TheLibFunc) {
case LibFunc_strlen:
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_strchr:
case LibFunc_strrchr:
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotThrow(F);
return Changed;
case LibFunc_strtol:
case LibFunc_strtod:
case LibFunc_strtof:
case LibFunc_strtoul:
case LibFunc_strtoll:
case LibFunc_strtold:
case LibFunc_strtoull:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_strcpy:
case LibFunc_stpcpy:
case LibFunc_strcat:
case LibFunc_strncat:
case LibFunc_strncpy:
case LibFunc_stpncpy:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc_strxfrm:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc_strcmp: // 0,1
case LibFunc_strspn: // 0,1
case LibFunc_strncmp: // 0,1
case LibFunc_strcspn: // 0,1
case LibFunc_strcoll: // 0,1
case LibFunc_strcasecmp: // 0,1
case LibFunc_strncasecmp: //
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc_strstr:
case LibFunc_strpbrk:
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc_strtok:
case LibFunc_strtok_r:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc_scanf:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_setbuf:
case LibFunc_setvbuf:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_strdup:
case LibFunc_strndup:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_stat:
case LibFunc_statvfs:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_sscanf:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc_sprintf:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc_snprintf:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 3);
Changed |= setOnlyReadsMemory(F, 3);
return Changed;
case LibFunc_setitimer:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
Changed |= setDoesNotCapture(F, 3);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc_system:
// May throw; "system" is a valid pthread cancellation point.
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_malloc:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
return Changed;
case LibFunc_memcmp:
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc_memchr:
case LibFunc_memrchr:
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotThrow(F);
return Changed;
case LibFunc_modf:
case LibFunc_modff:
case LibFunc_modfl:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc_memcpy:
case LibFunc_mempcpy:
case LibFunc_memccpy:
case LibFunc_memmove:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc_memcpy_chk:
Changed |= setDoesNotThrow(F);
return Changed;
case LibFunc_memalign:
Changed |= setDoesNotAlias(F, 0);
return Changed;
case LibFunc_mkdir:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_mktime:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_realloc:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_read:
// May throw; "read" is a valid pthread cancellation point.
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc_rewind:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_rmdir:
case LibFunc_remove:
case LibFunc_realpath:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_rename:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc_readlink:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_write:
// May throw; "write" is a valid pthread cancellation point.
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc_bcopy:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_bcmp:
Changed |= setDoesNotThrow(F);
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc_bzero:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_calloc:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
return Changed;
case LibFunc_chmod:
case LibFunc_chown:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_ctermid:
case LibFunc_clearerr:
case LibFunc_closedir:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_atoi:
case LibFunc_atol:
case LibFunc_atof:
case LibFunc_atoll:
Changed |= setDoesNotThrow(F);
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_access:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_fopen:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc_fdopen:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc_feof:
case LibFunc_free:
case LibFunc_fseek:
case LibFunc_ftell:
case LibFunc_fgetc:
case LibFunc_fseeko:
case LibFunc_ftello:
case LibFunc_fileno:
case LibFunc_fflush:
case LibFunc_fclose:
case LibFunc_fsetpos:
case LibFunc_flockfile:
case LibFunc_funlockfile:
case LibFunc_ftrylockfile:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_ferror:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F);
return Changed;
case LibFunc_fputc:
case LibFunc_fstat:
case LibFunc_frexp:
case LibFunc_frexpf:
case LibFunc_frexpl:
case LibFunc_fstatvfs:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc_fgets:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 3);
return Changed;
case LibFunc_fread:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 4);
return Changed;
case LibFunc_fwrite:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 4);
// FIXME: readonly #1?
return Changed;
case LibFunc_fputs:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_fscanf:
case LibFunc_fprintf:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc_fgetpos:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc_getc:
case LibFunc_getlogin_r:
case LibFunc_getc_unlocked:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_getenv:
Changed |= setDoesNotThrow(F);
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_gets:
case LibFunc_getchar:
Changed |= setDoesNotThrow(F);
return Changed;
case LibFunc_getitimer:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc_getpwnam:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_ungetc:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc_uname:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_unlink:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_unsetenv:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_utime:
case LibFunc_utimes:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc_putc:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc_puts:
case LibFunc_printf:
case LibFunc_perror:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_pread:
// May throw; "pread" is a valid pthread cancellation point.
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc_pwrite:
// May throw; "pwrite" is a valid pthread cancellation point.
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc_putchar:
Changed |= setDoesNotThrow(F);
return Changed;
case LibFunc_popen:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc_pclose:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_vscanf:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_vsscanf:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc_vfscanf:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc_valloc:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
return Changed;
case LibFunc_vprintf:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_vfprintf:
case LibFunc_vsprintf:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc_vsnprintf:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 3);
Changed |= setOnlyReadsMemory(F, 3);
return Changed;
case LibFunc_open:
// May throw; "open" is a valid pthread cancellation point.
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_opendir:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_tmpfile:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
return Changed;
case LibFunc_times:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_htonl:
case LibFunc_htons:
case LibFunc_ntohl:
case LibFunc_ntohs:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAccessMemory(F);
return Changed;
case LibFunc_lstat:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_lchown:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_qsort:
// May throw; places call through function pointer.
Changed |= setDoesNotCapture(F, 4);
return Changed;
case LibFunc_dunder_strdup:
case LibFunc_dunder_strndup:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_dunder_strtok_r:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc_under_IO_getc:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_under_IO_putc:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc_dunder_isoc99_scanf:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_stat64:
case LibFunc_lstat64:
case LibFunc_statvfs64:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_dunder_isoc99_sscanf:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc_fopen64:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc_fseeko64:
case LibFunc_ftello64:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_tmpfile64:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
return Changed;
case LibFunc_fstat64:
case LibFunc_fstatvfs64:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc_open64:
// May throw; "open" is a valid pthread cancellation point.
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_gettimeofday:
// Currently some platforms have the restrict keyword on the arguments to
// gettimeofday. To be conservative, do not add noalias to gettimeofday's
// arguments.
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc_Znwj: // new(unsigned int)
case LibFunc_Znwm: // new(unsigned long)
case LibFunc_Znaj: // new[](unsigned int)
case LibFunc_Znam: // new[](unsigned long)
case LibFunc_msvc_new_int: // new(unsigned int)
case LibFunc_msvc_new_longlong: // new(unsigned long long)
case LibFunc_msvc_new_array_int: // new[](unsigned int)
case LibFunc_msvc_new_array_longlong: // new[](unsigned long long)
// Operator new always returns a nonnull noalias pointer
Changed |= setNonNull(F, AttributeSet::ReturnIndex);
Changed |= setDoesNotAlias(F, AttributeSet::ReturnIndex);
return Changed;
//TODO: add LibFunc entries for:
//case LibFunc_memset_pattern4:
//case LibFunc_memset_pattern8:
case LibFunc_memset_pattern16:
Changed |= setOnlyAccessesArgMemory(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
// int __nvvm_reflect(const char *)
case LibFunc_nvvm_reflect:
Changed |= setDoesNotAccessMemory(F);
Changed |= setDoesNotThrow(F);
return Changed;
default:
// FIXME: It'd be really nice to cover all the library functions we're
// aware of here.
return false;
}
}
MemoryLocation MemoryLocation::getForArgument(ImmutableCallSite CS,
unsigned ArgIdx,
const TargetLibraryInfo &TLI) {
AAMDNodes AATags;
CS->getAAMetadata(AATags);
const Value *Arg = CS.getArgument(ArgIdx);
// We may be able to produce an exact size for known intrinsics.
if (const IntrinsicInst *II = dyn_cast<IntrinsicInst>(CS.getInstruction())) {
const DataLayout &DL = II->getModule()->getDataLayout();
switch (II->getIntrinsicID()) {
default:
break;
case Intrinsic::memset:
case Intrinsic::memcpy:
case Intrinsic::memmove:
assert((ArgIdx == 0 || ArgIdx == 1) &&
"Invalid argument index for memory intrinsic");
if (ConstantInt *LenCI = dyn_cast<ConstantInt>(II->getArgOperand(2)))
return MemoryLocation(Arg, LenCI->getZExtValue(), AATags);
break;
case Intrinsic::lifetime_start:
case Intrinsic::lifetime_end:
case Intrinsic::invariant_start:
assert(ArgIdx == 1 && "Invalid argument index");
return MemoryLocation(
Arg, cast<ConstantInt>(II->getArgOperand(0))->getZExtValue(), AATags);
case Intrinsic::invariant_end:
// The first argument to an invariant.end is a "descriptor" type (e.g. a
// pointer to a empty struct) which is never actually dereferenced.
if (ArgIdx == 0)
return MemoryLocation(Arg, 0, AATags);
assert(ArgIdx == 2 && "Invalid argument index");
return MemoryLocation(
Arg, cast<ConstantInt>(II->getArgOperand(1))->getZExtValue(), AATags);
case Intrinsic::arm_neon_vld1:
assert(ArgIdx == 0 && "Invalid argument index");
// LLVM's vld1 and vst1 intrinsics currently only support a single
// vector register.
return MemoryLocation(Arg, DL.getTypeStoreSize(II->getType()), AATags);
case Intrinsic::arm_neon_vst1:
assert(ArgIdx == 0 && "Invalid argument index");
return MemoryLocation(
Arg, DL.getTypeStoreSize(II->getArgOperand(1)->getType()), AATags);
}
}
// We can bound the aliasing properties of memset_pattern16 just as we can
// for memcpy/memset. This is particularly important because the
// LoopIdiomRecognizer likes to turn loops into calls to memset_pattern16
// whenever possible.
LibFunc F;
if (CS.getCalledFunction() && TLI.getLibFunc(*CS.getCalledFunction(), F) &&
F == LibFunc_memset_pattern16 && TLI.has(F)) {
assert((ArgIdx == 0 || ArgIdx == 1) &&
"Invalid argument index for memset_pattern16");
if (ArgIdx == 1)
return MemoryLocation(Arg, 16, AATags);
if (const ConstantInt *LenCI = dyn_cast<ConstantInt>(CS.getArgument(2)))
return MemoryLocation(Arg, LenCI->getZExtValue(), AATags);
}
// FIXME: Handle memset_pattern4 and memset_pattern8 also.
return MemoryLocation(CS.getArgument(ArgIdx), UnknownSize, AATags);
}
/// Analyze the name and prototype of the given function and set any applicable
/// attributes.
///
/// Returns true if any attributes were set and false otherwise.
static bool inferPrototypeAttributes(Function &F,
const TargetLibraryInfo &TLI) {
if (F.hasFnAttribute(Attribute::OptimizeNone))
return false;
FunctionType *FTy = F.getFunctionType();
LibFunc::Func TheLibFunc;
if (!(TLI.getLibFunc(F.getName(), TheLibFunc) && TLI.has(TheLibFunc)))
return false;
bool Changed = false;
switch (TheLibFunc) {
case LibFunc::strlen:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::strchr:
case LibFunc::strrchr:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isIntegerTy())
return false;
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotThrow(F);
return Changed;
case LibFunc::strtol:
case LibFunc::strtod:
case LibFunc::strtof:
case LibFunc::strtoul:
case LibFunc::strtoll:
case LibFunc::strtold:
case LibFunc::strtoull:
if (FTy->getNumParams() < 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::strcpy:
case LibFunc::stpcpy:
case LibFunc::strcat:
case LibFunc::strncat:
case LibFunc::strncpy:
case LibFunc::stpncpy:
if (FTy->getNumParams() < 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::strxfrm:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::strcmp: // 0,1
case LibFunc::strspn: // 0,1
case LibFunc::strncmp: // 0,1
case LibFunc::strcspn: // 0,1
case LibFunc::strcoll: // 0,1
case LibFunc::strcasecmp: // 0,1
case LibFunc::strncasecmp: //
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::strstr:
case LibFunc::strpbrk:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::strtok:
case LibFunc::strtok_r:
if (FTy->getNumParams() < 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::scanf:
if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::setbuf:
case LibFunc::setvbuf:
if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::strdup:
case LibFunc::strndup:
if (FTy->getNumParams() < 1 || !FTy->getReturnType()->isPointerTy() ||
!FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::stat:
case LibFunc::statvfs:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::sscanf:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::sprintf:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::snprintf:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(2)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 3);
Changed |= setOnlyReadsMemory(F, 3);
return Changed;
case LibFunc::setitimer:
if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy() ||
!FTy->getParamType(2)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
Changed |= setDoesNotCapture(F, 3);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::system:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
// May throw; "system" is a valid pthread cancellation point.
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::malloc:
if (FTy->getNumParams() != 1 || !FTy->getReturnType()->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
return Changed;
case LibFunc::memcmp:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::memchr:
case LibFunc::memrchr:
if (FTy->getNumParams() != 3)
return false;
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotThrow(F);
return Changed;
case LibFunc::modf:
case LibFunc::modff:
case LibFunc::modfl:
if (FTy->getNumParams() < 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::memcpy:
case LibFunc::memccpy:
case LibFunc::memmove:
if (FTy->getNumParams() < 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::memalign:
if (!FTy->getReturnType()->isPointerTy())
return false;
Changed |= setDoesNotAlias(F, 0);
return Changed;
case LibFunc::mkdir:
if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::mktime:
if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::realloc:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getReturnType()->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::read:
if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy())
return false;
// May throw; "read" is a valid pthread cancellation point.
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::rewind:
if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::rmdir:
case LibFunc::remove:
case LibFunc::realpath:
if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::rename:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::readlink:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::write:
if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy())
return false;
// May throw; "write" is a valid pthread cancellation point.
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::bcopy:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::bcmp:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::bzero:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::calloc:
if (FTy->getNumParams() != 2 || !FTy->getReturnType()->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
return Changed;
case LibFunc::chmod:
case LibFunc::chown:
if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::ctermid:
case LibFunc::clearerr:
case LibFunc::closedir:
if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::atoi:
case LibFunc::atol:
case LibFunc::atof:
case LibFunc::atoll:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::access:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::fopen:
if (FTy->getNumParams() != 2 || !FTy->getReturnType()->isPointerTy() ||
!FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::fdopen:
if (FTy->getNumParams() != 2 || !FTy->getReturnType()->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::feof:
case LibFunc::free:
case LibFunc::fseek:
case LibFunc::ftell:
case LibFunc::fgetc:
case LibFunc::fseeko:
case LibFunc::ftello:
case LibFunc::fileno:
case LibFunc::fflush:
case LibFunc::fclose:
case LibFunc::fsetpos:
case LibFunc::flockfile:
case LibFunc::funlockfile:
case LibFunc::ftrylockfile:
if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::ferror:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F);
return Changed;
case LibFunc::fputc:
case LibFunc::fstat:
case LibFunc::frexp:
case LibFunc::frexpf:
case LibFunc::frexpl:
case LibFunc::fstatvfs:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::fgets:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(2)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 3);
return Changed;
case LibFunc::fread:
if (FTy->getNumParams() != 4 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(3)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 4);
return Changed;
case LibFunc::fwrite:
if (FTy->getNumParams() != 4 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(3)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 4);
return Changed;
case LibFunc::fputs:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::fscanf:
case LibFunc::fprintf:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::fgetpos:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::getc:
case LibFunc::getlogin_r:
case LibFunc::getc_unlocked:
if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::getenv:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::gets:
case LibFunc::getchar:
Changed |= setDoesNotThrow(F);
return Changed;
case LibFunc::getitimer:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::getpwnam:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::ungetc:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::uname:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::unlink:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::unsetenv:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::utime:
case LibFunc::utimes:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::putc:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::puts:
case LibFunc::printf:
case LibFunc::perror:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::pread:
if (FTy->getNumParams() != 4 || !FTy->getParamType(1)->isPointerTy())
return false;
// May throw; "pread" is a valid pthread cancellation point.
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::pwrite:
if (FTy->getNumParams() != 4 || !FTy->getParamType(1)->isPointerTy())
return false;
// May throw; "pwrite" is a valid pthread cancellation point.
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::putchar:
Changed |= setDoesNotThrow(F);
return Changed;
case LibFunc::popen:
if (FTy->getNumParams() != 2 || !FTy->getReturnType()->isPointerTy() ||
!FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::pclose:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::vscanf:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::vsscanf:
if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy() ||
!FTy->getParamType(2)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::vfscanf:
if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy() ||
!FTy->getParamType(2)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::valloc:
if (!FTy->getReturnType()->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
return Changed;
case LibFunc::vprintf:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::vfprintf:
case LibFunc::vsprintf:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::vsnprintf:
if (FTy->getNumParams() != 4 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(2)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 3);
Changed |= setOnlyReadsMemory(F, 3);
return Changed;
case LibFunc::open:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy())
return false;
// May throw; "open" is a valid pthread cancellation point.
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::opendir:
if (FTy->getNumParams() != 1 || !FTy->getReturnType()->isPointerTy() ||
!FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::tmpfile:
if (!FTy->getReturnType()->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
return Changed;
case LibFunc::times:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::htonl:
case LibFunc::htons:
case LibFunc::ntohl:
case LibFunc::ntohs:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAccessMemory(F);
return Changed;
case LibFunc::lstat:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::lchown:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::qsort:
if (FTy->getNumParams() != 4 || !FTy->getParamType(3)->isPointerTy())
return false;
// May throw; places call through function pointer.
Changed |= setDoesNotCapture(F, 4);
return Changed;
case LibFunc::dunder_strdup:
case LibFunc::dunder_strndup:
if (FTy->getNumParams() < 1 || !FTy->getReturnType()->isPointerTy() ||
!FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::dunder_strtok_r:
if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::under_IO_getc:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::under_IO_putc:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::dunder_isoc99_scanf:
if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::stat64:
case LibFunc::lstat64:
case LibFunc::statvfs64:
if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::dunder_isoc99_sscanf:
if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::fopen64:
if (FTy->getNumParams() != 2 || !FTy->getReturnType()->isPointerTy() ||
!FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::fseeko64:
case LibFunc::ftello64:
if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::tmpfile64:
if (!FTy->getReturnType()->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
return Changed;
case LibFunc::fstat64:
case LibFunc::fstatvfs64:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::open64:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy())
return false;
// May throw; "open" is a valid pthread cancellation point.
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::gettimeofday:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
// Currently some platforms have the restrict keyword on the arguments to
// gettimeofday. To be conservative, do not add noalias to gettimeofday's
// arguments.
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::Znwj: // new(unsigned int)
case LibFunc::Znwm: // new(unsigned long)
case LibFunc::Znaj: // new[](unsigned int)
case LibFunc::Znam: // new[](unsigned long)
case LibFunc::msvc_new_int: // new(unsigned int)
case LibFunc::msvc_new_longlong: // new(unsigned long long)
case LibFunc::msvc_new_array_int: // new[](unsigned int)
case LibFunc::msvc_new_array_longlong: // new[](unsigned long long)
if (FTy->getNumParams() != 1)
return false;
// Operator new always returns a nonnull noalias pointer
Changed |= setNonNull(F, AttributeSet::ReturnIndex);
Changed |= setDoesNotAlias(F, AttributeSet::ReturnIndex);
return Changed;
default:
// FIXME: It'd be really nice to cover all the library functions we're
// aware of here.
return false;
}
}
