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//===-- RTDyldMemoryManager.cpp - Memory manager for MC-JIT -----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Implementation of the runtime dynamic memory manager base class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Config/config.h"
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#include "llvm/ExecutionEngine/RTDyldMemoryManager.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/DynamicLibrary.h"
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#include "llvm/Support/ErrorHandling.h"
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#include <cstdlib>
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#ifdef __linux__
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// These includes used by RTDyldMemoryManager::getPointerToNamedFunction()
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// for Glibc trickery. See comments in this function for more information.
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#include <fcntl.h>
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#include <unistd.h>
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#endif
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namespace llvm {
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RTDyldMemoryManager::~RTDyldMemoryManager() {}
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// Determine whether we can register EH tables.
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#if (defined(__GNUC__) && !defined(__ARM_EABI__) && !defined(__ia64__) && \
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!defined(__SEH__) && !defined(__USING_SJLJ_EXCEPTIONS__))
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#define HAVE_EHTABLE_SUPPORT 1
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#else
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#define HAVE_EHTABLE_SUPPORT 0
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#endif
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#if HAVE_EHTABLE_SUPPORT
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extern "C" void __register_frame(void *);
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extern "C" void __deregister_frame(void *);
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#else
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// The building compiler does not have __(de)register_frame but
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// it may be found at runtime in a dynamically-loaded library.
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// For example, this happens when building LLVM with Visual C++
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// but using the MingW runtime.
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void __register_frame(void *p) {
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static bool Searched = false;
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static void((*rf)(void *)) = 0;
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if (!Searched) {
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Searched = true;
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*(void **)&rf =
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llvm::sys::DynamicLibrary::SearchForAddressOfSymbol("__register_frame");
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}
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if (rf)
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rf(p);
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}
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void __deregister_frame(void *p) {
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static bool Searched = false;
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static void((*df)(void *)) = 0;
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if (!Searched) {
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Searched = true;
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*(void **)&df = llvm::sys::DynamicLibrary::SearchForAddressOfSymbol(
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"__deregister_frame");
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}
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if (df)
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df(p);
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}
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#endif
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#ifdef __APPLE__
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static const char *processFDE(const char *Entry, bool isDeregister) {
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const char *P = Entry;
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uint32_t Length = *((const uint32_t *)P);
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P += 4;
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uint32_t Offset = *((const uint32_t *)P);
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if (Offset != 0) {
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if (isDeregister)
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__deregister_frame(const_cast<char *>(Entry));
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else
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__register_frame(const_cast<char *>(Entry));
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}
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return P + Length;
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}
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// This implementation handles frame registration for local targets.
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// Memory managers for remote targets should re-implement this function
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// and use the LoadAddr parameter.
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void RTDyldMemoryManager::registerEHFramesInProcess(uint8_t *Addr,
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size_t Size) {
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// On OS X OS X __register_frame takes a single FDE as an argument.
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// See http://lists.llvm.org/pipermail/llvm-dev/2013-April/061737.html
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// and projects/libunwind/src/UnwindLevel1-gcc-ext.c.
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const char *P = (const char *)Addr;
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const char *End = P + Size;
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do {
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P = processFDE(P, false);
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} while(P != End);
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}
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void RTDyldMemoryManager::deregisterEHFramesInProcess(uint8_t *Addr,
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size_t Size) {
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const char *P = (const char *)Addr;
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const char *End = P + Size;
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do {
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P = processFDE(P, true);
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} while(P != End);
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}
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#else
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void RTDyldMemoryManager::registerEHFramesInProcess(uint8_t *Addr,
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size_t Size) {
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// On Linux __register_frame takes a single argument:
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// a pointer to the start of the .eh_frame section.
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// How can it find the end? Because crtendS.o is linked
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// in and it has an .eh_frame section with four zero chars.
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__register_frame(Addr);
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}
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void RTDyldMemoryManager::deregisterEHFramesInProcess(uint8_t *Addr,
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size_t Size) {
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__deregister_frame(Addr);
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}
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#endif
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void RTDyldMemoryManager::registerEHFrames(uint8_t *Addr, uint64_t LoadAddr,
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size_t Size) {
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registerEHFramesInProcess(Addr, Size);
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EHFrames.push_back({Addr, Size});
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}
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void RTDyldMemoryManager::deregisterEHFrames() {
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for (auto &Frame : EHFrames)
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deregisterEHFramesInProcess(Frame.Addr, Frame.Size);
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EHFrames.clear();
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}
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static int jit_noop() {
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return 0;
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}
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// ARM math functions are statically linked on Android from libgcc.a, but not
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// available at runtime for dynamic linking. On Linux these are usually placed
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// in libgcc_s.so so can be found by normal dynamic lookup.
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#if defined(__BIONIC__) && defined(__arm__)
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// List of functions which are statically linked on Android and can be generated
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// by LLVM. This is done as a nested macro which is used once to declare the
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// imported functions with ARM_MATH_DECL and once to compare them to the
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// user-requested symbol in getSymbolAddress with ARM_MATH_CHECK. The test
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// assumes that all functions start with __aeabi_ and getSymbolAddress must be
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// modified if that changes.
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#define ARM_MATH_IMPORTS(PP) \
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PP(__aeabi_d2f) \
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PP(__aeabi_d2iz) \
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PP(__aeabi_d2lz) \
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PP(__aeabi_d2uiz) \
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PP(__aeabi_d2ulz) \
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PP(__aeabi_dadd) \
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PP(__aeabi_dcmpeq) \
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PP(__aeabi_dcmpge) \
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PP(__aeabi_dcmpgt) \
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PP(__aeabi_dcmple) \
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PP(__aeabi_dcmplt) \
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PP(__aeabi_dcmpun) \
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PP(__aeabi_ddiv) \
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PP(__aeabi_dmul) \
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PP(__aeabi_dsub) \
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PP(__aeabi_f2d) \
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PP(__aeabi_f2iz) \
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PP(__aeabi_f2lz) \
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PP(__aeabi_f2uiz) \
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PP(__aeabi_f2ulz) \
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PP(__aeabi_fadd) \
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PP(__aeabi_fcmpeq) \
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PP(__aeabi_fcmpge) \
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PP(__aeabi_fcmpgt) \
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PP(__aeabi_fcmple) \
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PP(__aeabi_fcmplt) \
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PP(__aeabi_fcmpun) \
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PP(__aeabi_fdiv) \
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PP(__aeabi_fmul) \
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PP(__aeabi_fsub) \
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PP(__aeabi_i2d) \
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PP(__aeabi_i2f) \
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PP(__aeabi_idiv) \
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PP(__aeabi_idivmod) \
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PP(__aeabi_l2d) \
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PP(__aeabi_l2f) \
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PP(__aeabi_lasr) \
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PP(__aeabi_ldivmod) \
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PP(__aeabi_llsl) \
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PP(__aeabi_llsr) \
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PP(__aeabi_lmul) \
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PP(__aeabi_ui2d) \
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PP(__aeabi_ui2f) \
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PP(__aeabi_uidiv) \
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PP(__aeabi_uidivmod) \
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PP(__aeabi_ul2d) \
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PP(__aeabi_ul2f) \
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PP(__aeabi_uldivmod)
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// Declare statically linked math functions on ARM. The function declarations
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// here do not have the correct prototypes for each function in
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// ARM_MATH_IMPORTS, but it doesn't matter because only the symbol addresses are
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// needed. In particular the __aeabi_*divmod functions do not have calling
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// conventions which match any C prototype.
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#define ARM_MATH_DECL(name) extern "C" void name();
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ARM_MATH_IMPORTS(ARM_MATH_DECL)
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#undef ARM_MATH_DECL
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#endif
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#if defined(__linux__) && defined(__GLIBC__) && \
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(defined(__i386__) || defined(__x86_64__))
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extern "C" LLVM_ATTRIBUTE_WEAK void __morestack();
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#endif
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uint64_t
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RTDyldMemoryManager::getSymbolAddressInProcess(const std::string &Name) {
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// This implementation assumes that the host program is the target.
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// Clients generating code for a remote target should implement their own
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// memory manager.
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#if defined(__linux__) && defined(__GLIBC__)
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//===--------------------------------------------------------------------===//
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// Function stubs that are invoked instead of certain library calls
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//
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// Force the following functions to be linked in to anything that uses the
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// JIT. This is a hack designed to work around the all-too-clever Glibc
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// strategy of making these functions work differently when inlined vs. when
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// not inlined, and hiding their real definitions in a separate archive file
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// that the dynamic linker can't see. For more info, search for
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// 'libc_nonshared.a' on Google, or read http://llvm.org/PR274.
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if (Name == "stat") return (uint64_t)&stat;
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if (Name == "fstat") return (uint64_t)&fstat;
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if (Name == "lstat") return (uint64_t)&lstat;
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if (Name == "stat64") return (uint64_t)&stat64;
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if (Name == "fstat64") return (uint64_t)&fstat64;
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if (Name == "lstat64") return (uint64_t)&lstat64;
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if (Name == "atexit") return (uint64_t)&atexit;
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if (Name == "mknod") return (uint64_t)&mknod;
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#if defined(__i386__) || defined(__x86_64__)
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// __morestack lives in libgcc, a static library.
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if (&__morestack && Name == "__morestack")
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return (uint64_t)&__morestack;
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#endif
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#endif // __linux__ && __GLIBC__
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// See ARM_MATH_IMPORTS definition for explanation
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#if defined(__BIONIC__) && defined(__arm__)
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if (Name.compare(0, 8, "__aeabi_") == 0) {
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// Check if the user has requested any of the functions listed in
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// ARM_MATH_IMPORTS, and if so redirect to the statically linked symbol.
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#define ARM_MATH_CHECK(fn) if (Name == #fn) return (uint64_t)&fn;
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ARM_MATH_IMPORTS(ARM_MATH_CHECK)
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#undef ARM_MATH_CHECK
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}
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#endif
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// We should not invoke parent's ctors/dtors from generated main()!
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// On Mingw and Cygwin, the symbol __main is resolved to
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// callee's(eg. tools/lli) one, to invoke wrong duplicated ctors
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// (and register wrong callee's dtors with atexit(3)).
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// We expect ExecutionEngine::runStaticConstructorsDestructors()
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// is called before ExecutionEngine::runFunctionAsMain() is called.
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if (Name == "__main") return (uint64_t)&jit_noop;
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const char *NameStr = Name.c_str();
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// DynamicLibrary::SearchForAddresOfSymbol expects an unmangled 'C' symbol
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// name so ff we're on Darwin, strip the leading '_' off.
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#ifdef __APPLE__
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if (NameStr[0] == '_')
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++NameStr;
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#endif
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return (uint64_t)sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr);
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}
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void *RTDyldMemoryManager::getPointerToNamedFunction(const std::string &Name,
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bool AbortOnFailure) {
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uint64_t Addr = getSymbolAddress(Name);
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if (!Addr && AbortOnFailure)
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report_fatal_error("Program used external function '" + Name +
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"' which could not be resolved!");
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return (void*)Addr;
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}
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} // namespace llvm
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