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-rw-r--r--lib/Linker/LinkItems.cpp216
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diff --git a/lib/Linker/LinkItems.cpp b/lib/Linker/LinkItems.cpp
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-//===- lib/Linker/LinkItems.cpp - Link LLVM objects and libraries ---------===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file contains routines to handle linking together LLVM bitcode files,
-// and to handle annoying things like static libraries.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Linker.h"
-#include "llvm/Bitcode/ReaderWriter.h"
-#include "llvm/IR/Module.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/Path.h"
-#include "llvm/Support/system_error.h"
-using namespace llvm;
-
-// LinkItems - This function is the main entry point into linking. It takes a
-// list of LinkItem which indicates the order the files should be linked and
-// how each file should be treated (plain file or with library search). The
-// function only links bitcode and produces a result list of items that are
-// native objects.
-bool
-Linker::LinkInItems(const ItemList& Items, ItemList& NativeItems) {
- // Clear the NativeItems just in case
- NativeItems.clear();
-
- // For each linkage item ...
- for (ItemList::const_iterator I = Items.begin(), E = Items.end();
- I != E; ++I) {
- if (I->second) {
- // Link in the library suggested.
- bool is_native = false;
- if (LinkInLibrary(I->first, is_native))
- return true;
- if (is_native)
- NativeItems.push_back(*I);
- } else {
- // Link in the file suggested
- bool is_native = false;
- if (LinkInFile(sys::Path(I->first), is_native))
- return true;
- if (is_native)
- NativeItems.push_back(*I);
- }
- }
-
- return false;
-}
-
-
-/// LinkInLibrary - links one library into the HeadModule.
-///
-bool Linker::LinkInLibrary(StringRef Lib, bool& is_native) {
- is_native = false;
- // Determine where this library lives.
- sys::Path Pathname = FindLib(Lib);
- if (Pathname.isEmpty())
- return error("Cannot find library '" + Lib.str() + "'");
-
- // If its an archive, try to link it in
- std::string Magic;
- Pathname.getMagicNumber(Magic, 64);
- switch (sys::IdentifyFileType(Magic.c_str(), 64)) {
- default: llvm_unreachable("Bad file type identification");
- case sys::Unknown_FileType:
- return warning("Supposed library '" + Lib.str() + "' isn't a library.");
-
- case sys::Bitcode_FileType:
- // LLVM ".so" file.
- if (LinkInFile(Pathname, is_native))
- return true;
- break;
-
- case sys::Archive_FileType:
- if (LinkInArchive(Pathname, is_native))
- return error("Cannot link archive '" + Pathname.str() + "'");
- break;
-
- case sys::ELF_Relocatable_FileType:
- case sys::ELF_SharedObject_FileType:
- case sys::Mach_O_Object_FileType:
- case sys::Mach_O_FixedVirtualMemorySharedLib_FileType:
- case sys::Mach_O_DynamicallyLinkedSharedLib_FileType:
- case sys::Mach_O_DynamicallyLinkedSharedLibStub_FileType:
- case sys::COFF_FileType:
- is_native = true;
- break;
- }
- return false;
-}
-
-/// LinkLibraries - takes the specified library files and links them into the
-/// main bitcode object file.
-///
-/// Inputs:
-/// Libraries - The list of libraries to link into the module.
-///
-/// Return value:
-/// FALSE - No error.
-/// TRUE - Error.
-///
-bool Linker::LinkInLibraries(const std::vector<std::string> &Libraries) {
-
- // Process the set of libraries we've been provided.
- bool is_native = false;
- for (unsigned i = 0; i < Libraries.size(); ++i)
- if (LinkInLibrary(Libraries[i], is_native))
- return true;
-
- return false;
-}
-
-/// LinkInFile - opens a bitcode file and links in all objects which
-/// provide symbols that are currently undefined.
-///
-/// Inputs:
-/// File - The pathname of the bitcode file.
-///
-/// Outputs:
-/// ErrorMessage - A C++ string detailing what error occurred, if any.
-///
-/// Return Value:
-/// TRUE - An error occurred.
-/// FALSE - No errors.
-///
-bool Linker::LinkInFile(const sys::Path &File, bool &is_native) {
- is_native = false;
-
- // Check for a file of name "-", which means "read standard input"
- if (File.str() == "-") {
- std::auto_ptr<Module> M;
- OwningPtr<MemoryBuffer> Buffer;
- error_code ec;
- if (!(ec = MemoryBuffer::getSTDIN(Buffer))) {
- if (!Buffer->getBufferSize()) {
- Error = "standard input is empty";
- } else {
- M.reset(ParseBitcodeFile(Buffer.get(), Context, &Error));
- if (M.get())
- if (!LinkInModule(M.get(), &Error))
- return false;
- }
- }
- return error("Cannot link stdin: " + ec.message());
- }
-
- // Determine what variety of file it is.
- std::string Magic;
- if (!File.getMagicNumber(Magic, 64))
- return error("Cannot find linker input '" + File.str() + "'");
-
- switch (sys::IdentifyFileType(Magic.c_str(), 64)) {
- default: llvm_unreachable("Bad file type identification");
- case sys::Unknown_FileType:
- return warning("Ignoring file '" + File.str() +
- "' because does not contain bitcode.");
-
- case sys::Archive_FileType:
- // A user may specify an ar archive without -l, perhaps because it
- // is not installed as a library. Detect that and link the archive.
- if (LinkInArchive(File, is_native))
- return true;
- break;
-
- case sys::Bitcode_FileType: {
- verbose("Linking bitcode file '" + File.str() + "'");
- std::auto_ptr<Module> M(LoadObject(File));
- if (M.get() == 0)
- return error("Cannot load file '" + File.str() + "': " + Error);
- if (LinkInModule(M.get(), &Error))
- return error("Cannot link file '" + File.str() + "': " + Error);
-
- verbose("Linked in file '" + File.str() + "'");
- break;
- }
-
- case sys::ELF_Relocatable_FileType:
- case sys::ELF_SharedObject_FileType:
- case sys::Mach_O_Object_FileType:
- case sys::Mach_O_FixedVirtualMemorySharedLib_FileType:
- case sys::Mach_O_DynamicallyLinkedSharedLib_FileType:
- case sys::Mach_O_DynamicallyLinkedSharedLibStub_FileType:
- case sys::COFF_FileType:
- is_native = true;
- break;
- }
- return false;
-}
-
-/// LinkFiles - takes a module and a list of files and links them all together.
-/// It locates the file either in the current directory, as its absolute
-/// or relative pathname, or as a file somewhere in LLVM_LIB_SEARCH_PATH.
-///
-/// Inputs:
-/// Files - A vector of sys::Path indicating the LLVM bitcode filenames
-/// to be linked. The names can refer to a mixture of pure LLVM
-/// bitcode files and archive (ar) formatted files.
-///
-/// Return value:
-/// FALSE - No errors.
-/// TRUE - Some error occurred.
-///
-bool Linker::LinkInFiles(const std::vector<sys::Path> &Files) {
- bool is_native;
- for (unsigned i = 0; i < Files.size(); ++i)
- if (LinkInFile(Files[i], is_native))
- return true;
- return false;
-}
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