mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-24 03:33:20 +01:00
119 lines
4.1 KiB
C++
119 lines
4.1 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(__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*);
|
|
|
|
static const char *processFDE(const char *Entry) {
|
|
const char *P = Entry;
|
|
uint32_t Length = *((const uint32_t *)P);
|
|
P += 4;
|
|
uint32_t Offset = *((const uint32_t *)P);
|
|
if (Offset != 0)
|
|
__register_frame(const_cast<char *>(Entry));
|
|
return P + Length;
|
|
}
|
|
#endif
|
|
|
|
void RTDyldMemoryManager::registerEHFrames(StringRef SectionData) {
|
|
#if HAVE_EHTABLE_SUPPORT
|
|
const char *P = SectionData.data();
|
|
const char *End = SectionData.data() + SectionData.size();
|
|
do {
|
|
P = processFDE(P);
|
|
} while(P != End);
|
|
#endif
|
|
}
|
|
|
|
static int jit_noop() {
|
|
return 0;
|
|
}
|
|
|
|
void *RTDyldMemoryManager::getPointerToNamedFunction(const std::string &Name,
|
|
bool AbortOnFailure) {
|
|
#if defined(__linux__)
|
|
//===--------------------------------------------------------------------===//
|
|
// 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 (void*)(intptr_t)&stat;
|
|
if (Name == "fstat") return (void*)(intptr_t)&fstat;
|
|
if (Name == "lstat") return (void*)(intptr_t)&lstat;
|
|
if (Name == "stat64") return (void*)(intptr_t)&stat64;
|
|
if (Name == "fstat64") return (void*)(intptr_t)&fstat64;
|
|
if (Name == "lstat64") return (void*)(intptr_t)&lstat64;
|
|
if (Name == "atexit") return (void*)(intptr_t)&atexit;
|
|
if (Name == "mknod") return (void*)(intptr_t)&mknod;
|
|
#endif // __linux__
|
|
|
|
// 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 (void*)(intptr_t)&jit_noop;
|
|
|
|
const char *NameStr = Name.c_str();
|
|
void *Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr);
|
|
if (Ptr) return 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 Ptr;
|
|
}
|
|
|
|
if (AbortOnFailure)
|
|
report_fatal_error("Program used external function '" + Name +
|
|
"' which could not be resolved!");
|
|
return 0;
|
|
}
|
|
|
|
} // namespace llvm
|