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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
135 lines
3.5 KiB
C++
135 lines
3.5 KiB
C++
//===- Unix/DynamicLibrary.cpp - Unix DL Implementation ---------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides the UNIX specific implementation of DynamicLibrary.
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//
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//===----------------------------------------------------------------------===//
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#if defined(HAVE_DLFCN_H) && defined(HAVE_DLOPEN)
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#include <dlfcn.h>
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DynamicLibrary::HandleSet::~HandleSet() {
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// Close the libraries in reverse order.
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for (void *Handle : llvm::reverse(Handles))
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::dlclose(Handle);
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if (Process)
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::dlclose(Process);
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// llvm_shutdown called, Return to default
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DynamicLibrary::SearchOrder = DynamicLibrary::SO_Linker;
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}
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void *DynamicLibrary::HandleSet::DLOpen(const char *File, std::string *Err) {
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void *Handle = ::dlopen(File, RTLD_LAZY|RTLD_GLOBAL);
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if (!Handle) {
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if (Err) *Err = ::dlerror();
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return &DynamicLibrary::Invalid;
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}
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#ifdef __CYGWIN__
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// Cygwin searches symbols only in the main
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// with the handle of dlopen(NULL, RTLD_GLOBAL).
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if (!File)
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Handle = RTLD_DEFAULT;
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#endif
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return Handle;
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}
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void DynamicLibrary::HandleSet::DLClose(void *Handle) {
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::dlclose(Handle);
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}
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void *DynamicLibrary::HandleSet::DLSym(void *Handle, const char *Symbol) {
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return ::dlsym(Handle, Symbol);
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}
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#else // !HAVE_DLOPEN
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DynamicLibrary::HandleSet::~HandleSet() {}
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void *DynamicLibrary::HandleSet::DLOpen(const char *File, std::string *Err) {
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if (Err) *Err = "dlopen() not supported on this platform";
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return &Invalid;
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}
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void DynamicLibrary::HandleSet::DLClose(void *Handle) {
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}
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void *DynamicLibrary::HandleSet::DLSym(void *Handle, const char *Symbol) {
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return nullptr;
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}
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#endif
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// Must declare the symbols in the global namespace.
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static void *DoSearch(const char* SymbolName) {
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#define EXPLICIT_SYMBOL(SYM) \
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extern void *SYM; if (!strcmp(SymbolName, #SYM)) return (void*)&SYM
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// If this is darwin, it has some funky issues, try to solve them here. Some
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// important symbols are marked 'private external' which doesn't allow
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// SearchForAddressOfSymbol to find them. As such, we special case them here,
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// there is only a small handful of them.
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#ifdef __APPLE__
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{
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// __eprintf is sometimes used for assert() handling on x86.
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//
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// FIXME: Currently disabled when using Clang, as we don't always have our
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// runtime support libraries available.
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#ifndef __clang__
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#ifdef __i386__
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EXPLICIT_SYMBOL(__eprintf);
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#endif
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#endif
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}
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#endif
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#ifdef __CYGWIN__
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{
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EXPLICIT_SYMBOL(_alloca);
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EXPLICIT_SYMBOL(__main);
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}
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#endif
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#undef EXPLICIT_SYMBOL
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// This macro returns the address of a well-known, explicit symbol
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#define EXPLICIT_SYMBOL(SYM) \
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if (!strcmp(SymbolName, #SYM)) return &SYM
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// Under glibc we have a weird situation. The stderr/out/in symbols are both
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// macros and global variables because of standards requirements. So, we
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// boldly use the EXPLICIT_SYMBOL macro without checking for a #define first.
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#if defined(__GLIBC__)
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{
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EXPLICIT_SYMBOL(stderr);
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EXPLICIT_SYMBOL(stdout);
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EXPLICIT_SYMBOL(stdin);
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}
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#else
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// For everything else, we want to check to make sure the symbol isn't defined
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// as a macro before using EXPLICIT_SYMBOL.
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{
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#ifndef stdin
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EXPLICIT_SYMBOL(stdin);
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#endif
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#ifndef stdout
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EXPLICIT_SYMBOL(stdout);
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#endif
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#ifndef stderr
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EXPLICIT_SYMBOL(stderr);
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#endif
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}
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#endif
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#undef EXPLICIT_SYMBOL
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return nullptr;
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}
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