forked from OSchip/llvm-project
119 lines
4.0 KiB
C++
119 lines
4.0 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__) && \
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!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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static const char *processFDE(const char *Entry) {
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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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__register_frame(const_cast<char *>(Entry));
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return P + Length;
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}
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#endif
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void RTDyldMemoryManager::registerEHFrames(StringRef SectionData) {
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#if HAVE_EHTABLE_SUPPORT
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const char *P = SectionData.data();
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const char *End = SectionData.data() + SectionData.size();
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do {
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P = processFDE(P);
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} while(P != End);
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#endif
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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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void *RTDyldMemoryManager::getPointerToNamedFunction(const std::string &Name,
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bool AbortOnFailure) {
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#if defined(__linux__)
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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 (void*)(intptr_t)&stat;
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if (Name == "fstat") return (void*)(intptr_t)&fstat;
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if (Name == "lstat") return (void*)(intptr_t)&lstat;
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if (Name == "stat64") return (void*)(intptr_t)&stat64;
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if (Name == "fstat64") return (void*)(intptr_t)&fstat64;
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if (Name == "lstat64") return (void*)(intptr_t)&lstat64;
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if (Name == "atexit") return (void*)(intptr_t)&atexit;
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if (Name == "mknod") return (void*)(intptr_t)&mknod;
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#endif // __linux__
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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 (void*)(intptr_t)&jit_noop;
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const char *NameStr = Name.c_str();
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void *Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr);
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if (Ptr) return Ptr;
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// If it wasn't found and if it starts with an underscore ('_') character,
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// try again without the underscore.
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if (NameStr[0] == '_') {
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Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr+1);
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if (Ptr) return Ptr;
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}
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if (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 0;
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}
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} // namespace llvm
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