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239 lines
7.9 KiB
C++
239 lines
7.9 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 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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// This file contains routines to handle linking together LLVM bitcode 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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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Bitcode/ReaderWriter.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 bitcode 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_native = false;
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if (LinkInLibrary(I->first, is_native))
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return true;
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if (is_native)
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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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bool is_native = false;
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if (LinkInFile(sys::Path(I->first), is_native))
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return true;
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if (is_native)
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NativeItems.push_back(*I);
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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_native;
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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_native))
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return true;
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if (is_native)
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NativeItems.push_back(std::make_pair(*I, true));
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}
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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_native) {
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is_native = 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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default: assert(0 && "Bad file type identification");
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case sys::Unknown_FileType:
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return warning("Supposed library '" + Lib + "' isn't a library.");
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case sys::Bitcode_FileType:
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// LLVM ".so" file.
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if (LinkInFile(Pathname, is_native))
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return true;
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break;
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case sys::Archive_FileType:
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if (LinkInArchive(Pathname, is_native))
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return error("Cannot link archive '" + Pathname.toString() + "'");
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break;
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case sys::ELF_Relocatable_FileType:
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case sys::ELF_SharedObject_FileType:
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case sys::Mach_O_Object_FileType:
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case sys::Mach_O_FixedVirtualMemorySharedLib_FileType:
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case sys::Mach_O_DynamicallyLinkedSharedLib_FileType:
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case sys::Mach_O_DynamicallyLinkedSharedLibStub_FileType:
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case sys::COFF_FileType:
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is_native = true;
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break;
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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 bitcode 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_native = false;
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for (unsigned i = 0; i < Libraries.size(); ++i)
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if (LinkInLibrary(Libraries[i], is_native))
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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_native))
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return true;
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return false;
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}
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/// LinkInFile - opens a bitcode 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 bitcode 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, bool &is_native) {
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is_native = false;
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// Check for a file of name "-", which means "read standard input"
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if (File.toString() == "-") {
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std::auto_ptr<Module> M;
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if (MemoryBuffer *Buffer = MemoryBuffer::getSTDIN()) {
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M.reset(ParseBitcodeFile(Buffer, &Error));
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delete Buffer;
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if (M.get())
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if (!LinkInModule(M.get(), &Error))
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return false;
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} else
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Error = "standard input is empty";
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return error("Cannot link stdin: " + Error);
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}
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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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// If its an archive, try to link it in
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std::string Magic;
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File.getMagicNumber(Magic, 64);
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switch (sys::IdentifyFileType(Magic.c_str(), 64)) {
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default: assert(0 && "Bad file type identification");
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case sys::Unknown_FileType:
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return warning("Ignoring file '" + File.toString() +
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"' because does not contain bitcode.");
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case sys::Archive_FileType:
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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 archive.
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verbose("Linking archive file '" + File.toString() + "'");
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if (LinkInArchive(File, is_native))
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return true;
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break;
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case sys::Bitcode_FileType: {
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verbose("Linking bitcode 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(), &Error))
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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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break;
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}
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case sys::ELF_Relocatable_FileType:
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case sys::ELF_SharedObject_FileType:
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case sys::Mach_O_Object_FileType:
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case sys::Mach_O_FixedVirtualMemorySharedLib_FileType:
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case sys::Mach_O_DynamicallyLinkedSharedLib_FileType:
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case sys::Mach_O_DynamicallyLinkedSharedLibStub_FileType:
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case sys::COFF_FileType:
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is_native = true;
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break;
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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 bitcode filenames
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/// to be linked. The names can refer to a mixture of pure LLVM
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/// bitcode 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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bool is_native;
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for (unsigned i = 0; i < Files.size(); ++i)
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if (LinkInFile(Files[i], is_native))
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return true;
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return false;
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}
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