//===-- RTDyldMemoryManager.cpp - Memory manager for MC-JIT -----*- C++ -*-===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // Implementation of the runtime dynamic memory manager base class. // //===----------------------------------------------------------------------===// #include "llvm/Config/config.h" #include "llvm/ExecutionEngine/RTDyldMemoryManager.h" #include "llvm/Support/DynamicLibrary.h" #include "llvm/Support/ErrorHandling.h" #include #ifdef __linux__ // These includes used by RTDyldMemoryManager::getPointerToNamedFunction() // for Glibc trickery. See comments in this function for more information. #ifdef HAVE_SYS_STAT_H #include #endif #include #include #endif namespace llvm { RTDyldMemoryManager::~RTDyldMemoryManager() {} // Determine whether we can register EH tables. #if (defined(__GNUC__) && !defined(__ARM_EABI__) && !defined(__ia64__) && \ !defined(__SEH__) && !defined(__USING_SJLJ_EXCEPTIONS__)) #define HAVE_EHTABLE_SUPPORT 1 #else #define HAVE_EHTABLE_SUPPORT 0 #endif #if HAVE_EHTABLE_SUPPORT extern "C" void __register_frame(void*); extern "C" void __deregister_frame(void*); #else // The building compiler does not have __(de)register_frame but // it may be found at runtime in a dynamically-loaded library. // For example, this happens when building LLVM with Visual C++ // but using the MingW runtime. void __register_frame(void *p) { static bool Searched = false; static void *rf = 0; if (!Searched) { Searched = true; rf = llvm::sys::DynamicLibrary::SearchForAddressOfSymbol( "__register_frame"); } if (rf) ((void (*)(void *))rf)(p); } void __deregister_frame(void *p) { static bool Searched = false; static void *df = 0; if (!Searched) { Searched = true; df = llvm::sys::DynamicLibrary::SearchForAddressOfSymbol( "__deregister_frame"); } if (df) ((void (*)(void *))df)(p); } #endif #ifdef __APPLE__ static const char *processFDE(const char *Entry, bool isDeregister) { const char *P = Entry; uint32_t Length = *((const uint32_t *)P); P += 4; uint32_t Offset = *((const uint32_t *)P); if (Offset != 0) { if (isDeregister) __deregister_frame(const_cast(Entry)); else __register_frame(const_cast(Entry)); } return P + Length; } // This implementation handles frame registration for local targets. // Memory managers for remote targets should re-implement this function // and use the LoadAddr parameter. void RTDyldMemoryManager::registerEHFrames(uint8_t *Addr, uint64_t LoadAddr, size_t Size) { // On OS X OS X __register_frame takes a single FDE as an argument. // See http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-April/061768.html const char *P = (const char *)Addr; const char *End = P + Size; do { P = processFDE(P, false); } while(P != End); } void RTDyldMemoryManager::deregisterEHFrames(uint8_t *Addr, uint64_t LoadAddr, size_t Size) { const char *P = (const char *)Addr; const char *End = P + Size; do { P = processFDE(P, true); } while(P != End); } #else void RTDyldMemoryManager::registerEHFrames(uint8_t *Addr, uint64_t LoadAddr, size_t Size) { // On Linux __register_frame takes a single argument: // a pointer to the start of the .eh_frame section. // How can it find the end? Because crtendS.o is linked // in and it has an .eh_frame section with four zero chars. __register_frame(Addr); } void RTDyldMemoryManager::deregisterEHFrames(uint8_t *Addr, uint64_t LoadAddr, size_t Size) { __deregister_frame(Addr); } #endif static int jit_noop() { return 0; } // ARM math functions are statically linked on Android from libgcc.a, but not // available at runtime for dynamic linking. On Linux these are usually placed // in libgcc_s.so so can be found by normal dynamic lookup. #if defined(__BIONIC__) && defined(__arm__) // List of functions which are statically linked on Android and can be generated // by LLVM. This is done as a nested macro which is used once to declare the // imported functions with ARM_MATH_DECL and once to compare them to the // user-requested symbol in getSymbolAddress with ARM_MATH_CHECK. The test // assumes that all functions start with __aeabi_ and getSymbolAddress must be // modified if that changes. #define ARM_MATH_IMPORTS(PP) \ PP(__aeabi_d2f) \ PP(__aeabi_d2iz) \ PP(__aeabi_d2lz) \ PP(__aeabi_d2uiz) \ PP(__aeabi_d2ulz) \ PP(__aeabi_dadd) \ PP(__aeabi_dcmpeq) \ PP(__aeabi_dcmpge) \ PP(__aeabi_dcmpgt) \ PP(__aeabi_dcmple) \ PP(__aeabi_dcmplt) \ PP(__aeabi_dcmpun) \ PP(__aeabi_ddiv) \ PP(__aeabi_dmul) \ PP(__aeabi_dsub) \ PP(__aeabi_f2d) \ PP(__aeabi_f2iz) \ PP(__aeabi_f2lz) \ PP(__aeabi_f2uiz) \ PP(__aeabi_f2ulz) \ PP(__aeabi_fadd) \ PP(__aeabi_fcmpeq) \ PP(__aeabi_fcmpge) \ PP(__aeabi_fcmpgt) \ PP(__aeabi_fcmple) \ PP(__aeabi_fcmplt) \ PP(__aeabi_fcmpun) \ PP(__aeabi_fdiv) \ PP(__aeabi_fmul) \ PP(__aeabi_fsub) \ PP(__aeabi_i2d) \ PP(__aeabi_i2f) \ PP(__aeabi_idiv) \ PP(__aeabi_idivmod) \ PP(__aeabi_l2d) \ PP(__aeabi_l2f) \ PP(__aeabi_lasr) \ PP(__aeabi_ldivmod) \ PP(__aeabi_llsl) \ PP(__aeabi_llsr) \ PP(__aeabi_lmul) \ PP(__aeabi_ui2d) \ PP(__aeabi_ui2f) \ PP(__aeabi_uidiv) \ PP(__aeabi_uidivmod) \ PP(__aeabi_ul2d) \ PP(__aeabi_ul2f) \ PP(__aeabi_uldivmod) // Declare statically linked math functions on ARM. The function declarations // here do not have the correct prototypes for each function in // ARM_MATH_IMPORTS, but it doesn't matter because only the symbol addresses are // needed. In particular the __aeabi_*divmod functions do not have calling // conventions which match any C prototype. #define ARM_MATH_DECL(name) extern "C" void name(); ARM_MATH_IMPORTS(ARM_MATH_DECL) #undef ARM_MATH_DECL #endif uint64_t RTDyldMemoryManager::getSymbolAddress(const std::string &Name) { // This implementation assumes that the host program is the target. // Clients generating code for a remote target should implement their own // memory manager. #if defined(__linux__) && defined(__GLIBC__) //===--------------------------------------------------------------------===// // Function stubs that are invoked instead of certain library calls // // Force the following functions to be linked in to anything that uses the // JIT. This is a hack designed to work around the all-too-clever Glibc // strategy of making these functions work differently when inlined vs. when // not inlined, and hiding their real definitions in a separate archive file // that the dynamic linker can't see. For more info, search for // 'libc_nonshared.a' on Google, or read http://llvm.org/PR274. if (Name == "stat") return (uint64_t)&stat; if (Name == "fstat") return (uint64_t)&fstat; if (Name == "lstat") return (uint64_t)&lstat; if (Name == "stat64") return (uint64_t)&stat64; if (Name == "fstat64") return (uint64_t)&fstat64; if (Name == "lstat64") return (uint64_t)&lstat64; if (Name == "atexit") return (uint64_t)&atexit; if (Name == "mknod") return (uint64_t)&mknod; #endif // __linux__ && __GLIBC__ // See ARM_MATH_IMPORTS definition for explanation #if defined(__BIONIC__) && defined(__arm__) if (Name.compare(0, 8, "__aeabi_") == 0) { // Check if the user has requested any of the functions listed in // ARM_MATH_IMPORTS, and if so redirect to the statically linked symbol. #define ARM_MATH_CHECK(fn) if (Name == #fn) return (uint64_t)&fn; ARM_MATH_IMPORTS(ARM_MATH_CHECK) #undef ARM_MATH_CHECK } #endif // We should not invoke parent's ctors/dtors from generated main()! // On Mingw and Cygwin, the symbol __main is resolved to // callee's(eg. tools/lli) one, to invoke wrong duplicated ctors // (and register wrong callee's dtors with atexit(3)). // We expect ExecutionEngine::runStaticConstructorsDestructors() // is called before ExecutionEngine::runFunctionAsMain() is called. if (Name == "__main") return (uint64_t)&jit_noop; // Try to demangle Name before looking it up in the process, otherwise symbol // '_' (if present) will shadow '', and there will be no way to // refer to the latter. const char *NameStr = Name.c_str(); if (NameStr[0] == '_') if (void *Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr + 1)) return (uint64_t)Ptr; // If we Name did not require demangling, or we failed to find the demangled // name, try again without demangling. return (uint64_t)sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr); } void *RTDyldMemoryManager::getPointerToNamedFunction(const std::string &Name, bool AbortOnFailure) { uint64_t Addr = getSymbolAddress(Name); if (!Addr && AbortOnFailure) report_fatal_error("Program used external function '" + Name + "' which could not be resolved!"); return (void*)Addr; } } // namespace llvm