-namespace {
- struct VISIBILITY_HIDDEN StringCompare {
- bool operator()(const char *LHS, const char *RHS) {
- return strcmp(LHS, RHS) < 0;
- }
- };
-}
-
-// Note that this list cannot contain libm functions (such as acos and sqrt)
-// that set errno on a domain or other error.
-static const char *DoesntAccessMemoryFns[] = {
- "abs", "labs", "llabs", "imaxabs", "fabs", "fabsf", "fabsl",
- "trunc", "truncf", "truncl", "ldexp",
-
- "atan", "atanf", "atanl", "atan2", "atan2f", "atan2l",
- "cbrt",
- "cos", "cosf", "cosl",
- "exp", "expf", "expl",
- "hypot",
- "sin", "sinf", "sinl",
- "tan", "tanf", "tanl", "tanh", "tanhf", "tanhl",
-
- "floor", "floorf", "floorl", "ceil", "ceilf", "ceill",
-
- // ctype.h
- "isalnum", "isalpha", "iscntrl", "isdigit", "isgraph", "islower", "isprint"
- "ispunct", "isspace", "isupper", "isxdigit", "tolower", "toupper",
-
- // wctype.h"
- "iswalnum", "iswalpha", "iswcntrl", "iswdigit", "iswgraph", "iswlower",
- "iswprint", "iswpunct", "iswspace", "iswupper", "iswxdigit",
-
- "iswctype", "towctrans", "towlower", "towupper",
-
- "btowc", "wctob",
-
- "isinf", "isnan", "finite",
-
- // C99 math functions
- "copysign", "copysignf", "copysignd",
- "nexttoward", "nexttowardf", "nexttowardd",
- "nextafter", "nextafterf", "nextafterd",
-
- // ISO C99:
- "__signbit", "__signbitf", "__signbitl",
-};
-
-
-static const char *OnlyReadsMemoryFns[] = {
- "atoi", "atol", "atof", "atoll", "atoq", "a64l",
- "bcmp", "memcmp", "memchr", "memrchr", "wmemcmp", "wmemchr",
-
- // Strings
- "strcmp", "strcasecmp", "strcoll", "strncmp", "strncasecmp",
- "strchr", "strcspn", "strlen", "strpbrk", "strrchr", "strspn", "strstr",
- "index", "rindex",
-
- // Wide char strings
- "wcschr", "wcscmp", "wcscoll", "wcscspn", "wcslen", "wcsncmp", "wcspbrk",
- "wcsrchr", "wcsspn", "wcsstr",
-
- // glibc
- "alphasort", "alphasort64", "versionsort", "versionsort64",
-
- // C99
- "nan", "nanf", "nand",
-
- // File I/O
- "feof", "ferror", "fileno",
- "feof_unlocked", "ferror_unlocked", "fileno_unlocked"
-};
-
-static ManagedStatic<std::vector<const char*> > NoMemoryTable;
-static ManagedStatic<std::vector<const char*> > OnlyReadsMemoryTable;
-
-
-AliasAnalysis::ModRefBehavior
-BasicAliasAnalysis::getModRefBehavior(Function *F, CallSite CS,
- std::vector<PointerAccessInfo> *Info) {
- if (!F->isDeclaration()) return UnknownModRefBehavior;
-
- static bool Initialized = false;
- if (!Initialized) {
- NoMemoryTable->insert(NoMemoryTable->end(),
- DoesntAccessMemoryFns,
- DoesntAccessMemoryFns+
- sizeof(DoesntAccessMemoryFns)/sizeof(DoesntAccessMemoryFns[0]));
-
- OnlyReadsMemoryTable->insert(OnlyReadsMemoryTable->end(),
- OnlyReadsMemoryFns,
- OnlyReadsMemoryFns+
- sizeof(OnlyReadsMemoryFns)/sizeof(OnlyReadsMemoryFns[0]));
-#define GET_MODREF_BEHAVIOR
-#include "llvm/Intrinsics.gen"
-#undef GET_MODREF_BEHAVIOR
-
- // Sort the table the first time through.
- std::sort(NoMemoryTable->begin(), NoMemoryTable->end(), StringCompare());
- std::sort(OnlyReadsMemoryTable->begin(), OnlyReadsMemoryTable->end(),
- StringCompare());
- Initialized = true;
- }
-
- std::vector<const char*>::iterator Ptr =
- std::lower_bound(NoMemoryTable->begin(), NoMemoryTable->end(),
- F->getName().c_str(), StringCompare());
- if (Ptr != NoMemoryTable->end() && *Ptr == F->getName())
- return DoesNotAccessMemory;
-
- Ptr = std::lower_bound(OnlyReadsMemoryTable->begin(),
- OnlyReadsMemoryTable->end(),
- F->getName().c_str(), StringCompare());
- if (Ptr != OnlyReadsMemoryTable->end() && *Ptr == F->getName())
- return OnlyReadsMemory;
-
- return UnknownModRefBehavior;
-}
-