mirror of
https://github.com/c64scene-ar/llvm-6502.git
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e2ef4419a8
member of RTDyldMemoryManager (and rename to getSymbolAddressInProcess). The functionality this provides is very specific to RTDyldMemoryManager, so it makes sense to keep it in that class to avoid accidental re-use. No functional change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218741 91177308-0d34-0410-b5e6-96231b3b80d8
283 lines
9.4 KiB
C++
283 lines
9.4 KiB
C++
//===-- 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/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 = 0;
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if (!Searched) {
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Searched = true;
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rf = llvm::sys::DynamicLibrary::SearchForAddressOfSymbol(
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"__register_frame");
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}
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if (rf)
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((void (*)(void *))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 = 0;
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if (!Searched) {
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Searched = true;
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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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((void (*)(void *))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::registerEHFrames(uint8_t *Addr,
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uint64_t LoadAddr,
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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.cs.uiuc.edu/pipermail/llvmdev/2013-April/061768.html
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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::deregisterEHFrames(uint8_t *Addr,
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uint64_t LoadAddr,
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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::registerEHFrames(uint8_t *Addr,
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uint64_t LoadAddr,
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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::deregisterEHFrames(uint8_t *Addr,
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uint64_t LoadAddr,
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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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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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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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#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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// Try to demangle Name before looking it up in the process, otherwise symbol
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// '_<Name>' (if present) will shadow '<Name>', and there will be no way to
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// refer to the latter.
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const char *NameStr = Name.c_str();
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if (NameStr[0] == '_')
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if (void *Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr + 1))
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return (uint64_t)Ptr;
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// If we Name did not require demangling, or we failed to find the demangled
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// name, try again without demangling.
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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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