forked from OSchip/llvm-project
282 lines
9.3 KiB
C++
282 lines
9.3 KiB
C++
//===-- 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 <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() {}
|
|
|
|
// 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<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::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;
|
|
|
|
const char *NameStr = Name.c_str();
|
|
void *Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr);
|
|
if (Ptr)
|
|
return (uint64_t)Ptr;
|
|
|
|
// If it wasn't found and if it starts with an underscore ('_') character,
|
|
// try again without the underscore.
|
|
if (NameStr[0] == '_') {
|
|
Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr+1);
|
|
if (Ptr)
|
|
return (uint64_t)Ptr;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
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
|