mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18655 91177308-0d34-0410-b5e6-96231b3b80d8
160 lines
5.4 KiB
C++
160 lines
5.4 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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#include "llvm/ModuleProvider.h"
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#include "llvm/PassManager.h"
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#include "llvm/ADT/SetOperations.h"
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#include "llvm/Bytecode/Reader.h"
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#include "llvm/Bytecode/Archive.h"
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#include "llvm/Bytecode/WriteBytecodePass.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Transforms/IPO.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Config/config.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/FileUtilities.h"
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#include "llvm/Support/Timer.h"
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#include "llvm/System/Signals.h"
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#include "llvm/Support/SystemUtils.h"
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#include <algorithm>
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#include <fstream>
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#include <memory>
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#include <set>
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using namespace llvm;
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static bool
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LinkOneLibrary(const char*progname, Module* HeadModule,
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const std::string& Lib,
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const std::vector<std::string>& LibPaths,
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bool Verbose, bool Native) {
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// String in which to receive error messages.
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std::string ErrorMessage;
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// Determine where this library lives.
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std::string Pathname = FindLib(Lib, LibPaths);
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if (Pathname.empty()) {
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// If the pathname does not exist, then simply return if we're doing a
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// native link and give a warning if we're doing a bytecode link.
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if (!Native) {
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std::cerr << progname << ": warning: Cannot find library '"
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<< Lib << "'\n";
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return false;
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}
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}
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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 (IsArchive(Pathname)) {
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if (Verbose)
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std::cerr << "Trying to link archive '" << Pathname << "' (-l"
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<< Lib << ")\n";
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if (LinkInArchive(HeadModule, Pathname, &ErrorMessage, Verbose)) {
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std::cerr << progname << ": " << ErrorMessage
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<< ": Error linking in archive '" << Pathname << "' (-l"
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<< Lib << ")\n";
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return true;
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}
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} else {
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std::cerr << progname << ": WARNING: Supposed library -l"
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<< Lib << " isn't a library.\n";
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}
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return false;
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}
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// LinkItems - preserve link order for an arbitrary set of linkage items.
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Module*
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llvm::LinkItems(const char *progname, const LinkItemList& Items,
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const std::vector<std::string>& LibPaths,
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bool Verbose, bool Native) {
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// Construct the HeadModule to contain the result of the linkage
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std::auto_ptr<Module> HeadModule(new Module(progname));
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// Construct a mutable path list we can add paths to. This list will always
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// have LLVM_LIB_SEARCH_PATH at the end so we place it there now.
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std::vector<std::string> MyLibPaths(LibPaths);
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MyLibPaths.insert(MyLibPaths.begin(),".");
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char* SearchPath = getenv("LLVM_LIB_SEARCH_PATH");
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if (SearchPath)
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MyLibPaths.push_back(SearchPath);
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// For each linkage item ...
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for (LinkItemList::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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if (LinkOneLibrary(progname,HeadModule.get(),I->first,MyLibPaths,
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Verbose,Native))
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return 0;
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} else {
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std::vector<std::string> Files;
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Files.push_back(I->first);
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if (LinkFiles(progname,HeadModule.get(),Files,Verbose))
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return 0;
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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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const Module::LibraryListType& DepLibs = HeadModule->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(LinkOneLibrary(progname,HeadModule.get(),*I,MyLibPaths,Verbose,Native))
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return 0;
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}
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return HeadModule.release();
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}
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// BuildLinkItems -- This function
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void llvm::BuildLinkItems(
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LinkItemList& Items,
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const cl::list<std::string>& Files,
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const cl::list<std::string>& Libraries) {
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// Build the list of linkage items for LinkItems.
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cl::list<std::string>::const_iterator fileIt = Files.begin();
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cl::list<std::string>::const_iterator libIt = Libraries.begin();
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int libPos = -1, filePos = -1;
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while ( 1 ) {
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if (libIt != Libraries.end())
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libPos = Libraries.getPosition(libIt - Libraries.begin());
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else
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libPos = -1;
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if (fileIt != Files.end())
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filePos = Files.getPosition(fileIt - Files.begin());
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else
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filePos = -1;
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if (filePos != -1 && (libPos == -1 || filePos < libPos)) {
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// Add a source file
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Items.push_back(std::make_pair(*fileIt++, false));
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} else if (libPos != -1 && (filePos == -1 || libPos < filePos)) {
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// Add a library
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Items.push_back(std::make_pair(*libIt++, true));
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} else {
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break; // we're done with the list
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}
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}
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}
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