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783084211a
With these patches we implement the ability for the Linker library to keep track of which libraries were actually bytecode files (not archives) and cause their users to remove such files from the list of libraries to pass to the native linker. llvm-svn: 25169
182 lines
6.1 KiB
C++
182 lines
6.1 KiB
C++
//===- lib/Linker/LinkItems.cpp - Link LLVM objects and libraries ---------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Reid Spencer and is distributed under the
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// University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains routines to handle linking together LLVM bytecode files,
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// and to handle annoying things like static libraries.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Linker.h"
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#include "llvm/Module.h"
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using namespace llvm;
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// LinkItems - This function is the main entry point into linking. It takes a
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// list of LinkItem which indicates the order the files should be linked and
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// how each file should be treated (plain file or with library search). The
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// function only links bytecode and produces a result list of items that are
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// native objects.
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bool
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Linker::LinkInItems(const ItemList& Items, ItemList& NativeItems) {
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// Clear the NativeItems just in case
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NativeItems.clear();
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// For each linkage item ...
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for (ItemList::const_iterator I = Items.begin(), E = Items.end();
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I != E; ++I) {
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if (I->second) {
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// Link in the library suggested.
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bool is_file = true;
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if (LinkInLibrary(I->first,is_file))
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return true;
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if (!is_file)
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NativeItems.push_back(*I);
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} else {
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// Link in the file suggested
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if (LinkInFile(sys::Path(I->first)))
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return true;
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}
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}
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// At this point we have processed all the link items provided to us. Since
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// we have an aggregated module at this point, the dependent libraries in
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// that module should also be aggregated with duplicates eliminated. This is
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// now the time to process the dependent libraries to resolve any remaining
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// symbols.
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bool is_bytecode;
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for (Module::lib_iterator I = Composite->lib_begin(),
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E = Composite->lib_end(); I != E; ++I)
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if(LinkInLibrary(*I, is_bytecode))
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return true;
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return false;
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}
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/// LinkInLibrary - links one library into the HeadModule.
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///
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bool Linker::LinkInLibrary(const std::string& Lib, bool& is_file) {
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is_file = false;
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// Determine where this library lives.
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sys::Path Pathname = FindLib(Lib);
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if (Pathname.isEmpty())
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return warning("Cannot find library '" + Lib + "'");
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// If its an archive, try to link it in
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std::string Magic;
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Pathname.getMagicNumber(Magic, 64);
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switch (sys::IdentifyFileType(Magic.c_str(), 64)) {
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case sys::BytecodeFileType:
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case sys::CompressedBytecodeFileType:
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// LLVM ".so" file.
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if (LinkInFile(Pathname))
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return error("Cannot link file '" + Pathname.toString() + "'");
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is_file = true;
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break;
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case sys::ArchiveFileType:
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if (LinkInArchive(Pathname))
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return error("Cannot link archive '" + Pathname.toString() + "'");
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break;
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default:
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return warning("Supposed library '" + Lib + "' isn't a library.");
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}
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return false;
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}
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/// LinkLibraries - takes the specified library files and links them into the
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/// main bytecode object file.
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///
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/// Inputs:
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/// Libraries - The list of libraries to link into the module.
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///
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/// Return value:
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/// FALSE - No error.
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/// TRUE - Error.
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///
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bool Linker::LinkInLibraries(const std::vector<std::string> &Libraries) {
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// Process the set of libraries we've been provided.
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bool is_bytecode;
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for (unsigned i = 0; i < Libraries.size(); ++i)
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if (LinkInLibrary(Libraries[i], is_bytecode))
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return true;
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// At this point we have processed all the libraries provided to us. Since
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// we have an aggregated module at this point, the dependent libraries in
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// that module should also be aggregated with duplicates eliminated. This is
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// now the time to process the dependent libraries to resolve any remaining
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// symbols.
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const Module::LibraryListType& DepLibs = Composite->getLibraries();
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for (Module::LibraryListType::const_iterator I = DepLibs.begin(),
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E = DepLibs.end(); I != E; ++I)
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if (LinkInLibrary(*I, is_bytecode))
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return true;
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return false;
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}
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/// LinkInFile - opens a bytecode file and links in all objects which
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/// provide symbols that are currently undefined.
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///
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/// Inputs:
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/// File - The pathname of the bytecode file.
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///
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/// Outputs:
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/// ErrorMessage - A C++ string detailing what error occurred, if any.
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///
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/// Return Value:
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/// TRUE - An error occurred.
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/// FALSE - No errors.
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///
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bool Linker::LinkInFile(const sys::Path &File) {
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// Make sure we can at least read the file
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if (!File.canRead())
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return error("Cannot find linker input '" + File.toString() + "'");
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// A user may specify an ar archive without -l, perhaps because it
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// is not installed as a library. Detect that and link the library.
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if (File.isArchive()) {
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if (LinkInArchive(File))
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return error("Cannot link archive '" + File.toString() + "'");
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} else if (File.isBytecodeFile()) {
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verbose("Linking bytecode file '" + File.toString() + "'");
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std::auto_ptr<Module> M(LoadObject(File));
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if (M.get() == 0)
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return error("Cannot load file '" + File.toString() + "'" + Error);
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if (LinkInModule(M.get()))
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return error("Cannot link file '" + File.toString() + "'" + Error);
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verbose("Linked in file '" + File.toString() + "'");
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} else {
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return warning("File of unknown type '" + File.toString() + "' ignored.");
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}
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return false;
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}
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/// LinkFiles - takes a module and a list of files and links them all together.
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/// It locates the file either in the current directory, as its absolute
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/// or relative pathname, or as a file somewhere in LLVM_LIB_SEARCH_PATH.
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///
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/// Inputs:
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/// Files - A vector of sys::Path indicating the LLVM bytecode filenames
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/// to be linked. The names can refer to a mixture of pure LLVM
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/// bytecode files and archive (ar) formatted files.
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///
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/// Return value:
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/// FALSE - No errors.
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/// TRUE - Some error occurred.
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///
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bool Linker::LinkInFiles(const std::vector<sys::Path> &Files) {
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for (unsigned i = 0; i < Files.size(); ++i)
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if (LinkInFile(Files[i]))
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return true;
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return false;
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}
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