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llvm-project/llvm/lib/ExecutionEngine/RuntimeDyld/RTDyldMemoryManager.cpp

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//===-- RTDyldMemoryManager.cpp - Memory manager for MC-JIT -----*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Implementation of the runtime dynamic memory manager base class.
//
//===----------------------------------------------------------------------===//
#include "llvm/Config/config.h"
#include "llvm/ExecutionEngine/RTDyldMemoryManager.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/DynamicLibrary.h"
#include "llvm/Support/ErrorHandling.h"
#include <cstdlib>
#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 <sys/stat.h>
#endif
#include <fcntl.h>
#include <unistd.h>
#endif
namespace llvm {
RTDyldMemoryManager::~RTDyldMemoryManager() = default;
#if defined(HAVE_REGISTER_FRAME) && defined(HAVE_DEREGISTER_FRAME) && \
!defined(__SEH__) && !defined(__USING_SJLJ_EXCEPTIONS__)
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.
static void __register_frame(void *p) {
static bool Searched = false;
static void((*rf)(void *)) = 0;
if (!Searched) {
Searched = true;
*(void **)&rf =
llvm::sys::DynamicLibrary::SearchForAddressOfSymbol("__register_frame");
}
if (rf)
rf(p);
}
static void __deregister_frame(void *p) {
static bool Searched = false;
static void((*df)(void *)) = 0;
if (!Searched) {
Searched = true;
*(void **)&df = llvm::sys::DynamicLibrary::SearchForAddressOfSymbol(
"__deregister_frame");
}
if (df)
df(p);
}
#endif
/* libgcc and libunwind __register_frame behave differently. We use the presence
* of __unw_add_dynamic_fde to detect libunwind. */
#if defined(HAVE_UNW_ADD_DYNAMIC_FDE) || defined(__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<char *>(Entry));
else
__register_frame(const_cast<char *>(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::registerEHFramesInProcess(uint8_t *Addr,
size_t Size) {
// On OS X OS X __register_frame takes a single FDE as an argument.
// See http://lists.llvm.org/pipermail/llvm-dev/2013-April/061737.html
// and projects/libunwind/src/UnwindLevel1-gcc-ext.c.
const char *P = (const char *)Addr;
const char *End = P + Size;
while (P != End)
P = processFDE(P, false);
}
void RTDyldMemoryManager::deregisterEHFramesInProcess(uint8_t *Addr,
size_t Size) {
const char *P = (const char *)Addr;
const char *End = P + Size;
while (P != End)
P = processFDE(P, true);
}
#else
void RTDyldMemoryManager::registerEHFramesInProcess(uint8_t *Addr,
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::deregisterEHFramesInProcess(uint8_t *Addr,
size_t Size) {
__deregister_frame(Addr);
}
#endif
void RTDyldMemoryManager::registerEHFrames(uint8_t *Addr, uint64_t LoadAddr,
size_t Size) {
registerEHFramesInProcess(Addr, Size);
EHFrames.push_back({Addr, Size});
}
void RTDyldMemoryManager::deregisterEHFrames() {
for (auto &Frame : EHFrames)
deregisterEHFramesInProcess(Frame.Addr, Frame.Size);
EHFrames.clear();
}
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
#if defined(__linux__) && defined(__GLIBC__) && \
(defined(__i386__) || defined(__x86_64__))
extern "C" LLVM_ATTRIBUTE_WEAK void __morestack();
#endif
uint64_t
RTDyldMemoryManager::getSymbolAddressInProcess(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;
#if defined(__i386__) || defined(__x86_64__)
// __morestack lives in libgcc, a static library.
if (&__morestack && Name == "__morestack")
return (uint64_t)&__morestack;
#endif
#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;
const char *NameStr = Name.c_str();
// DynamicLibrary::SearchForAddresOfSymbol expects an unmangled 'C' symbol
// name so ff we're on Darwin, strip the leading '_' off.
#ifdef __APPLE__
if (NameStr[0] == '_')
++NameStr;
#endif
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(Twine("Program used external function '") + Name +
"' which could not be resolved!");
return (void*)Addr;
}
void RTDyldMemoryManager::anchor() {}
void MCJITMemoryManager::anchor() {}
} // namespace llvm
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