X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FSystem%2FDynamicLibrary.cpp;h=572ba496e191451d201a7c9cd3195911f8909fab;hb=629c1a3f78494d0dd769fe82bd2bd17df0555843;hp=231cdac19c6bffb3da5b3e4c7ded68dc92218ff8;hpb=bccc8abc79338d1cfdd5ea20f7288452ddf75b84;p=oota-llvm.git diff --git a/lib/System/DynamicLibrary.cpp b/lib/System/DynamicLibrary.cpp index 231cdac19c6..572ba496e19 100644 --- a/lib/System/DynamicLibrary.cpp +++ b/lib/System/DynamicLibrary.cpp @@ -1,10 +1,10 @@ //===-- DynamicLibrary.cpp - Runtime link/load libraries --------*- C++ -*-===// -// +// // The LLVM Compiler Infrastructure // -// This file was developed by Reid Spencer and is distributed under the -// University of Illinois Open Source License. See LICENSE.TXT for details. -// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// //===----------------------------------------------------------------------===// // // This header file implements the operating system DynamicLibrary concept. @@ -13,6 +13,16 @@ #include "llvm/System/DynamicLibrary.h" #include "llvm/Config/config.h" +#include +#include + +// Collection of symbol name/value pairs to be searched prior to any libraries. +static std::map g_symbols; + +void llvm::sys::DynamicLibrary::AddSymbol(const char* symbolName, + void *symbolValue) { + g_symbols[symbolName] = symbolValue; +} // It is not possible to use ltdl.c on VC++ builds as the terms of its LGPL // license and special exception would cause all of LLVM to be placed under @@ -26,102 +36,68 @@ #else -#include "ltdl.h" +//#include "ltdl.h" +#include #include using namespace llvm; using namespace llvm::sys; //===----------------------------------------------------------------------===// //=== WARNING: Implementation here must contain only TRULY operating system -//=== independent code. +//=== independent code. //===----------------------------------------------------------------------===// -static bool did_initialize_ltdl = false; - -static inline void check_ltdl_initialization() { - if (!did_initialize_ltdl) { - if (0 != lt_dlinit()) - throw std::string(lt_dlerror()); - did_initialize_ltdl = true; - } -} - -static std::vector OpenedHandles; - -DynamicLibrary::DynamicLibrary() : handle(0) { - check_ltdl_initialization(); - - lt_dlhandle a_handle = lt_dlopen(0); - - if (a_handle == 0) - throw std::string("Can't open program as dynamic library"); - - handle = a_handle; - OpenedHandles.push_back(a_handle); -} - -DynamicLibrary::DynamicLibrary(const char*filename) : handle(0) { - check_ltdl_initialization(); - - lt_dlhandle a_handle = lt_dlopen(filename); +//static std::vector OpenedHandles; +static std::vector OpenedHandles; - if (a_handle == 0) - a_handle = lt_dlopenext(filename); - - if (a_handle == 0) - throw std::string("Can't open :") + filename + ": " + lt_dlerror(); - - handle = a_handle; - OpenedHandles.push_back(a_handle); -} +DynamicLibrary::DynamicLibrary() {} DynamicLibrary::~DynamicLibrary() { - lt_dlhandle a_handle = (lt_dlhandle) handle; - if (a_handle) { - lt_dlclose(a_handle); - - for (std::vector::iterator I = OpenedHandles.begin(), - E = OpenedHandles.end(); I != E; ++I) { - if (*I == a_handle) { - // Note: don't use the swap/pop_back trick here. Order is important. - OpenedHandles.erase(I); - } - } + while(!OpenedHandles.empty()) { + void *H = OpenedHandles.back(); OpenedHandles.pop_back(); + dlclose(H); } } -void DynamicLibrary::LoadLibraryPermanently(const char* filename) { - check_ltdl_initialization(); - lt_dlhandle a_handle = lt_dlopen(filename); - - if (a_handle == 0) - a_handle = lt_dlopenext(filename); - - if (a_handle == 0) - throw std::string("Can't open :") + filename + ": " + lt_dlerror(); - - lt_dlmakeresident(a_handle); - - OpenedHandles.push_back(a_handle); +bool DynamicLibrary::LoadLibraryPermanently(const char *Filename, + std::string *ErrMsg) { + void *H = dlopen(Filename, RTLD_LAZY); + if (H == 0) { + if (ErrMsg) + *ErrMsg = dlerror(); + return true; + } + OpenedHandles.push_back(H); + return false; } void* DynamicLibrary::SearchForAddressOfSymbol(const char* symbolName) { - check_ltdl_initialization(); - for (std::vector::iterator I = OpenedHandles.begin(), + // check_ltdl_initialization(); + + // First check symbols added via AddSymbol(). + std::map::iterator I = g_symbols.find(symbolName); + if (I != g_symbols.end()) + return I->second; + + // Now search the libraries. + for (std::vector::iterator I = OpenedHandles.begin(), E = OpenedHandles.end(); I != E; ++I) { - lt_ptr ptr = lt_dlsym(*I, symbolName); + //lt_ptr ptr = lt_dlsym(*I, symbolName); + void *ptr = dlsym(*I, symbolName); if (ptr) return ptr; } +#define EXPLICIT_SYMBOL(SYM) \ + extern void *SYM; if (!strcmp(symbolName, #SYM)) return &SYM + // If this is darwin, it has some funky issues, try to solve them here. Some // important symbols are marked 'private external' which doesn't allow // SearchForAddressOfSymbol to find them. As such, we special case them here, // there is only a small handful of them. + #ifdef __APPLE__ { -#define EXPLICIT_SYMBOL(SYM) \ - extern void *SYM; if (!strcmp(symbolName, #SYM)) return &SYM EXPLICIT_SYMBOL(__ashldi3); EXPLICIT_SYMBOL(__ashrdi3); EXPLICIT_SYMBOL(__cmpdi2); @@ -137,16 +113,49 @@ void* DynamicLibrary::SearchForAddressOfSymbol(const char* symbolName) { EXPLICIT_SYMBOL(__moddi3); EXPLICIT_SYMBOL(__udivdi3); EXPLICIT_SYMBOL(__umoddi3); + } +#endif + +#ifdef __CYGWIN__ + { + EXPLICIT_SYMBOL(_alloca); + EXPLICIT_SYMBOL(__main); + } +#endif + #undef EXPLICIT_SYMBOL + +// This macro returns the address of a well-known, explicit symbol +#define EXPLICIT_SYMBOL(SYM) \ + if (!strcmp(symbolName, #SYM)) return &SYM + +// On linux we have a weird situation. The stderr/out/in symbols are both +// macros and global variables because of standards requirements. So, we +// boldly use the EXPLICIT_SYMBOL macro without checking for a #define first. +#if defined(__linux__) + { + EXPLICIT_SYMBOL(stderr); + EXPLICIT_SYMBOL(stdout); + EXPLICIT_SYMBOL(stdin); + } +#else + // For everything else, we want to check to make sure the symbol isn't defined + // as a macro before using EXPLICIT_SYMBOL. + { +#ifndef stdin + EXPLICIT_SYMBOL(stdin); +#endif +#ifndef stdout + EXPLICIT_SYMBOL(stdout); +#endif +#ifndef stderr + EXPLICIT_SYMBOL(stderr); +#endif } #endif +#undef EXPLICIT_SYMBOL return 0; } -void *DynamicLibrary::GetAddressOfSymbol(const char *symbolName) { - assert(handle != 0 && "Invalid DynamicLibrary handle"); - return lt_dlsym((lt_dlhandle) handle, symbolName); -} - #endif // LLVM_ON_WIN32