From 56ae5185ae249cd74712aca6953217b16468ef6e Mon Sep 17 00:00:00 2001
From: Reid Spencer <rspencer@reidspencer.com>
Date: Sun, 14 Nov 2004 21:46:08 +0000
Subject: [PATCH] Interface to Linker (revised/expanded from Support/Linker.h)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17752 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Linker.h | 80 +++++++++++++++++++++++++++++++++++++------
 1 file changed, 70 insertions(+), 10 deletions(-)

diff --git a/include/llvm/Linker.h b/include/llvm/Linker.h
index 523906ce6a3..a7a07812c38 100644
--- a/include/llvm/Linker.h
+++ b/include/llvm/Linker.h
@@ -2,12 +2,12 @@
 // 
 //                     The LLVM Compiler Infrastructure
 //
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file was developed by Reid Spencer and is distributed under the 
+// University of Illinois Open Source License. See LICENSE.TXT for details.
 // 
 //===----------------------------------------------------------------------===//
 //
-// This file defines the interface to the module linker.
+// This file defines the interface to the module/file/archive linker.
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,19 +15,79 @@
 #define LLVM_LINKER_H
 
 #include <string>
+#include <vector>
+#include <set>
 
 namespace llvm {
 
 class Module;
 
-// LinkModules - This function links two modules together, with the resulting
-// left module modified to be the composite of the two input modules.  If an
-// error occurs, true is returned and ErrorMsg (if not null) is set to indicate
-// the problem.
-//
-bool LinkModules(Module *Dest, const Module *Src, std::string *ErrorMsg = 0);
+/// This is the heart of the linker. The \p Src module is linked into the 
+/// \p Dest module. If an error occurs, true is returned, otherwise false. If
+/// \p ErrorMsg is not null and an error occurs, \p *ErrorMsg will be set to a
+/// readable string that indicates the nature of the error.
+/// @returns true if there's an error
+/// @brief Link two modules together
+bool LinkModules(
+  Module* Dest,          ///< Module into which \p Src is linked
+  const Module* Src,     ///< Module linked into \p Dest
+  std::string* ErrorMsg  ///< Optional error message string
+);
 
+/// This function links the bytecode \p Files into the \p HeadModule. No 
+/// matching of symbols is done. It simply calls loads each module and calls
+/// LinkModules for each one.
+/// @returns true if an error occurs, false otherwise
+bool LinkFiles (
+  const char * progname, ///< Name of the program being linked (for output)
+  Module * HeadModule,   ///< Main (resulting) module to be linked into
+  const std::vector<std::string> & Files, ///< Files to link in
+  bool Verbose ///< Link verbosely, indicating each action
+);
+
+/// This function links one archive, \p Filename,  that contains bytecode into
+/// \p HeadModule.  If an error occurs, true is returned, otherwise false. If
+/// \p ErrorMsg is not null and an error occurs, \p *ErrorMsg will be set to a
+/// readable string that indicates the nature of the error.
+/// @returns true if there's an error
+/// @brief Link in one archive.
+bool LinkInArchive( 
+  Module* HeadModule,          ///< Main (resulting) module to be linked into
+  const std::string& Filename, ///< Filename of the archive to link
+  std::string* ErrorMsg,       ///< Error message if an error occurs.
+  bool Verbose                 ///< Link verbosely, indicating each action
+);
+
+/// This function provides the ability to handle the -L and -l options on a 
+/// linker's command line. It will link into \p HeadModule any modules found in
+/// the \p Libraries (which might be found in the \p LibPaths). 
+/// @brief Link libraries into a module
+void LinkLibraries (
+  const char * progname,   ///< Name of the program being linked (for output)
+  Module* HeadModule,      ///< Main (resulting) module to be linked into
+  const std::vector<std::string> & Libraries, ///< Set of libraries to link in
+  const std::vector<std::string> & LibPaths,  ///< Set of library paths
+  bool Verbose, ///< Link verbosely, indicating each action
+  bool Native ///< Linking is for a native executable
+);
+
+/// This function looks at Module \p M and returns a set of strings, 
+/// \p DefinedSymbols, that is the publicly visible defined symbols in 
+/// module \p M.
+void GetAllDefinedSymbols (Module *M, std::set<std::string> &DefinedSymbols);
+
+/// This function looks at Module \p M and returns a set of strings, 
+/// \p UnefinedSymbols, that is the publicly visible undefined symbols in 
+/// module \p M.
+void GetAllUndefinedSymbols(Module *M, std::set<std::string> &UndefinedSymbols);
+
+/// This function looks through a set of \p Paths to find a library with the
+/// name \p Filename. If \p SharedObjectOnly is true, it only finds a match
+/// if the file is a shared library.
+std::string FindLib(const std::string &Filename,
+                    const std::vector<std::string> &Paths,
+                    bool SharedObjectOnly = false);
+  
 } // End llvm namespace
 
 #endif
-