Reorganize llvmc code.

Move the code from 'llvmc/driver' into a new CompilerDriver library, and change
the build system accordingly. Makes it easier for projects using LLVM to build
their own llvmc-based drivers.

Tested with objdir != srcdir.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65821 91177308-0d34-0410-b5e6-96231b3b80d8

8 files changed, 10 insertions, 810 deletions

diff --git a/tools/llvmc/driver/Action.cpp b/tools/llvmc/driver/Action.cpp
deleted file mode 100644
index c0a1b84..0000000
--- a/tools/llvmc/driver/Action.cpp
+++ /dev/null
@@ -1,78 +0,0 @@
-//===--- Action.cpp - The LLVM Compiler Driver ------------------*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open
-// Source License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-//  Action class - implementation and auxiliary functions.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/CompilerDriver/Action.h"
-
-#include "llvm/Support/CommandLine.h"
-#include "llvm/System/Program.h"
-
-#include <iostream>
-#include <stdexcept>
-
-using namespace llvm;
-using namespace llvmc;
-
-extern cl::opt<bool> DryRun;
-extern cl::opt<bool> VerboseMode;
-
-namespace {
-  int ExecuteProgram(const std::string& name,
-                     const StrVector& args) {
-    sys::Path prog = sys::Program::FindProgramByName(name);
-
-    if (prog.isEmpty())
-      throw std::runtime_error("Can't find program '" + name + "'");
-    if (!prog.canExecute())
-      throw std::runtime_error("Program '" + name + "' is not executable.");
-
-    // Build the command line vector and the redirects array.
-    const sys::Path* redirects[3] = {0,0,0};
-    sys::Path stdout_redirect;
-
-    std::vector<const char*> argv;
-    argv.reserve((args.size()+2));
-    argv.push_back(name.c_str());
-
-    for (StrVector::const_iterator B = args.begin(), E = args.end();
-         B!=E; ++B) {
-      if (*B == ">") {
-        ++B;
-        stdout_redirect.set(*B);
-        redirects[1] = &stdout_redirect;
-      }
-      else {
-        argv.push_back((*B).c_str());
-      }
-    }
-    argv.push_back(0);  // null terminate list.
-
-    // Invoke the program.
-    return sys::Program::ExecuteAndWait(prog, &argv[0], 0, &redirects[0]);
-  }
-
-  void print_string (const std::string& str) {
-    std::cerr << str << ' ';
-  }
-}
-
-int llvmc::Action::Execute() const {
-  if (DryRun || VerboseMode) {
-    std::cerr << Command_ << " ";
-    std::for_each(Args_.begin(), Args_.end(), print_string);
-    std::cerr << '\n';
-  }
-  if (DryRun)
-    return 0;
-  else
-    return ExecuteProgram(Command_, Args_);
-}
diff --git a/tools/llvmc/driver/CMakeLists.txt b/tools/llvmc/driver/CMakeLists.txt
deleted file mode 100644
index 153dd44..0000000
--- a/tools/llvmc/driver/CMakeLists.txt
+++ /dev/null
@@ -1,10 +0,0 @@
-set(LLVM_LINK_COMPONENTS support system)
-set(LLVM_REQUIRES_EH 1)
-
-add_llvm_tool(llvmc
-  Action.cpp
-  CompilationGraph.cpp
-  llvmc.cpp
-  Plugin.cpp
-  Tool.cpp
-  )
diff --git a/tools/llvmc/driver/CompilationGraph.cpp b/tools/llvmc/driver/CompilationGraph.cpp
deleted file mode 100644
index 238ef6f..0000000
--- a/tools/llvmc/driver/CompilationGraph.cpp
+++ /dev/null
@@ -1,534 +0,0 @@
-//===--- CompilationGraph.cpp - The LLVM Compiler Driver --------*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open
-// Source License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-//  Compilation graph - implementation.
-//
-//===----------------------------------------------------------------------===//
-
-#include "Error.h"
-#include "llvm/CompilerDriver/CompilationGraph.h"
-
-#include "llvm/ADT/STLExtras.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/DOTGraphTraits.h"
-#include "llvm/Support/GraphWriter.h"
-
-#include <algorithm>
-#include <cstring>
-#include <iostream>
-#include <iterator>
-#include <limits>
-#include <queue>
-#include <stdexcept>
-
-using namespace llvm;
-using namespace llvmc;
-
-extern cl::list<std::string> InputFilenames;
-extern cl::list<std::string> Languages;
-
-namespace llvmc {
-
-  const std::string& LanguageMap::GetLanguage(const sys::Path& File) const {
-    LanguageMap::const_iterator Lang = this->find(File.getSuffix());
-    if (Lang == this->end())
-      throw std::runtime_error("Unknown suffix: " + File.getSuffix());
-    return Lang->second;
-  }
-}
-
-namespace {
-
-  /// ChooseEdge - Return the edge with the maximum weight.
-  template <class C>
-  const Edge* ChooseEdge(const C& EdgesContainer,
-                         const InputLanguagesSet& InLangs,
-                         const std::string& NodeName = "root") {
-    const Edge* MaxEdge = 0;
-    unsigned MaxWeight = 0;
-    bool SingleMax = true;
-
-    for (typename C::const_iterator B = EdgesContainer.begin(),
-           E = EdgesContainer.end(); B != E; ++B) {
-      const Edge* e = B->getPtr();
-      unsigned EW = e->Weight(InLangs);
-      if (EW > MaxWeight) {
-        MaxEdge = e;
-        MaxWeight = EW;
-        SingleMax = true;
-      } else if (EW == MaxWeight) {
-        SingleMax = false;
-      }
-    }
-
-    if (!SingleMax)
-      throw std::runtime_error("Node " + NodeName +
-                               ": multiple maximal outward edges found!"
-                               " Most probably a specification error.");
-    if (!MaxEdge)
-      throw std::runtime_error("Node " + NodeName +
-                               ": no maximal outward edge found!"
-                               " Most probably a specification error.");
-    return MaxEdge;
-  }
-
-}
-
-void Node::AddEdge(Edge* Edg) {
-  // If there already was an edge between two nodes, modify it instead
-  // of adding a new edge.
-  const std::string& ToolName = Edg->ToolName();
-  for (container_type::iterator B = OutEdges.begin(), E = OutEdges.end();
-       B != E; ++B) {
-    if ((*B)->ToolName() == ToolName) {
-      llvm::IntrusiveRefCntPtr<Edge>(Edg).swap(*B);
-      return;
-    }
-  }
-  OutEdges.push_back(llvm::IntrusiveRefCntPtr<Edge>(Edg));
-}
-
-CompilationGraph::CompilationGraph() {
-  NodesMap["root"] = Node(this);
-}
-
-Node& CompilationGraph::getNode(const std::string& ToolName) {
-  nodes_map_type::iterator I = NodesMap.find(ToolName);
-  if (I == NodesMap.end())
-    throw std::runtime_error("Node " + ToolName + " is not in the graph");
-  return I->second;
-}
-
-const Node& CompilationGraph::getNode(const std::string& ToolName) const {
-  nodes_map_type::const_iterator I = NodesMap.find(ToolName);
-  if (I == NodesMap.end())
-    throw std::runtime_error("Node " + ToolName + " is not in the graph!");
-  return I->second;
-}
-
-// Find the tools list corresponding to the given language name.
-const CompilationGraph::tools_vector_type&
-CompilationGraph::getToolsVector(const std::string& LangName) const
-{
-  tools_map_type::const_iterator I = ToolsMap.find(LangName);
-  if (I == ToolsMap.end())
-    throw std::runtime_error("No tool corresponding to the language "
-                             + LangName + " found");
-  return I->second;
-}
-
-void CompilationGraph::insertNode(Tool* V) {
-  if (NodesMap.count(V->Name()) == 0)
-    NodesMap[V->Name()] = Node(this, V);
-}
-
-void CompilationGraph::insertEdge(const std::string& A, Edge* Edg) {
-  Node& B = getNode(Edg->ToolName());
-  if (A == "root") {
-    const char** InLangs = B.ToolPtr->InputLanguages();
-    for (;*InLangs; ++InLangs)
-      ToolsMap[*InLangs].push_back(IntrusiveRefCntPtr<Edge>(Edg));
-    NodesMap["root"].AddEdge(Edg);
-  }
-  else {
-    Node& N = getNode(A);
-    N.AddEdge(Edg);
-  }
-  // Increase the inward edge counter.
-  B.IncrInEdges();
-}
-
-// Pass input file through the chain until we bump into a Join node or
-// a node that says that it is the last.
-void CompilationGraph::PassThroughGraph (const sys::Path& InFile,
-                                         const Node* StartNode,
-                                         const InputLanguagesSet& InLangs,
-                                         const sys::Path& TempDir,
-                                         const LanguageMap& LangMap) const {
-  sys::Path In = InFile;
-  const Node* CurNode = StartNode;
-
-  while(true) {
-    Tool* CurTool = CurNode->ToolPtr.getPtr();
-
-    if (CurTool->IsJoin()) {
-      JoinTool& JT = dynamic_cast<JoinTool&>(*CurTool);
-      JT.AddToJoinList(In);
-      break;
-    }
-
-    Action CurAction = CurTool->GenerateAction(In, CurNode->HasChildren(),
-                                               TempDir, InLangs, LangMap);
-
-    if (int ret = CurAction.Execute())
-      throw error_code(ret);
-
-    if (CurAction.StopCompilation())
-      return;
-
-    CurNode = &getNode(ChooseEdge(CurNode->OutEdges,
-                                  InLangs,
-                                  CurNode->Name())->ToolName());
-    In = CurAction.OutFile();
-  }
-}
-
-// Find the head of the toolchain corresponding to the given file.
-// Also, insert an input language into InLangs.
-const Node* CompilationGraph::
-FindToolChain(const sys::Path& In, const std::string* ForceLanguage,
-              InputLanguagesSet& InLangs, const LanguageMap& LangMap) const {
-
-  // Determine the input language.
-  const std::string& InLanguage =
-    ForceLanguage ? *ForceLanguage : LangMap.GetLanguage(In);
-
-  // Add the current input language to the input language set.
-  InLangs.insert(InLanguage);
-
-  // Find the toolchain for the input language.
-  const tools_vector_type& TV = getToolsVector(InLanguage);
-  if (TV.empty())
-    throw std::runtime_error("No toolchain corresponding to language "
-                             + InLanguage + " found");
-  return &getNode(ChooseEdge(TV, InLangs)->ToolName());
-}
-
-// Helper function used by Build().
-// Traverses initial portions of the toolchains (up to the first Join node).
-// This function is also responsible for handling the -x option.
-void CompilationGraph::BuildInitial (InputLanguagesSet& InLangs,
-                                     const sys::Path& TempDir,
-                                     const LanguageMap& LangMap) {
-  // This is related to -x option handling.
-  cl::list<std::string>::const_iterator xIter = Languages.begin(),
-    xBegin = xIter, xEnd = Languages.end();
-  bool xEmpty = true;
-  const std::string* xLanguage = 0;
-  unsigned xPos = 0, xPosNext = 0, filePos = 0;
-
-  if (xIter != xEnd) {
-    xEmpty = false;
-    xPos = Languages.getPosition(xIter - xBegin);
-    cl::list<std::string>::const_iterator xNext = llvm::next(xIter);
-    xPosNext = (xNext == xEnd) ? std::numeric_limits<unsigned>::max()
-      : Languages.getPosition(xNext - xBegin);
-    xLanguage = (*xIter == "none") ? 0 : &(*xIter);
-  }
-
-  // For each input file:
-  for (cl::list<std::string>::const_iterator B = InputFilenames.begin(),
-         CB = B, E = InputFilenames.end(); B != E; ++B) {
-    sys::Path In = sys::Path(*B);
-
-    // Code for handling the -x option.
-    // Output: std::string* xLanguage (can be NULL).
-    if (!xEmpty) {
-      filePos = InputFilenames.getPosition(B - CB);
-
-      if (xPos < filePos) {
-        if (filePos < xPosNext) {
-          xLanguage = (*xIter == "none") ? 0 : &(*xIter);
-        }
-        else { // filePos >= xPosNext
-          // Skip xIters while filePos > xPosNext
-          while (filePos > xPosNext) {
-            ++xIter;
-            xPos = xPosNext;
-
-            cl::list<std::string>::const_iterator xNext = llvm::next(xIter);
-            if (xNext == xEnd)
-              xPosNext = std::numeric_limits<unsigned>::max();
-            else
-              xPosNext = Languages.getPosition(xNext - xBegin);
-            xLanguage = (*xIter == "none") ? 0 : &(*xIter);
-          }
-        }
-      }
-    }
-
-    // Find the toolchain corresponding to this file.
-    const Node* N = FindToolChain(In, xLanguage, InLangs, LangMap);
-    // Pass file through the chain starting at head.
-    PassThroughGraph(In, N, InLangs, TempDir, LangMap);
-  }
-}
-
-// Sort the nodes in topological order.
-void CompilationGraph::TopologicalSort(std::vector<const Node*>& Out) {
-  std::queue<const Node*> Q;
-  Q.push(&getNode("root"));
-
-  while (!Q.empty()) {
-    const Node* A = Q.front();
-    Q.pop();
-    Out.push_back(A);
-    for (Node::const_iterator EB = A->EdgesBegin(), EE = A->EdgesEnd();
-         EB != EE; ++EB) {
-      Node* B = &getNode((*EB)->ToolName());
-      B->DecrInEdges();
-      if (B->HasNoInEdges())
-        Q.push(B);
-    }
-  }
-}
-
-namespace {
-  bool NotJoinNode(const Node* N) {
-    return N->ToolPtr ? !N->ToolPtr->IsJoin() : true;
-  }
-}
-
-// Call TopologicalSort and filter the resulting list to include
-// only Join nodes.
-void CompilationGraph::
-TopologicalSortFilterJoinNodes(std::vector<const Node*>& Out) {
-  std::vector<const Node*> TopSorted;
-  TopologicalSort(TopSorted);
-  std::remove_copy_if(TopSorted.begin(), TopSorted.end(),
-                      std::back_inserter(Out), NotJoinNode);
-}
-
-int CompilationGraph::Build (const sys::Path& TempDir,
-                             const LanguageMap& LangMap) {
-
-  InputLanguagesSet InLangs;
-
-  // Traverse initial parts of the toolchains and fill in InLangs.
-  BuildInitial(InLangs, TempDir, LangMap);
-
-  std::vector<const Node*> JTV;
-  TopologicalSortFilterJoinNodes(JTV);
-
-  // For all join nodes in topological order:
-  for (std::vector<const Node*>::iterator B = JTV.begin(), E = JTV.end();
-       B != E; ++B) {
-
-    const Node* CurNode = *B;
-    JoinTool* JT = &dynamic_cast<JoinTool&>(*CurNode->ToolPtr.getPtr());
-
-    // Are there any files in the join list?
-    if (JT->JoinListEmpty())
-      continue;
-
-    Action CurAction = JT->GenerateAction(CurNode->HasChildren(),
-                                          TempDir, InLangs, LangMap);
-
-    if (int ret = CurAction.Execute())
-      throw error_code(ret);
-
-    if (CurAction.StopCompilation())
-      return 0;
-
-    const Node* NextNode = &getNode(ChooseEdge(CurNode->OutEdges, InLangs,
-                                               CurNode->Name())->ToolName());
-    PassThroughGraph(sys::Path(CurAction.OutFile()), NextNode,
-                     InLangs, TempDir, LangMap);
-  }
-
-  return 0;
-}
-
-int CompilationGraph::CheckLanguageNames() const {
-  int ret = 0;
-  // Check that names for output and input languages on all edges do match.
-  for (const_nodes_iterator B = this->NodesMap.begin(),
-         E = this->NodesMap.end(); B != E; ++B) {
-
-    const Node & N1 = B->second;
-    if (N1.ToolPtr) {
-      for (Node::const_iterator EB = N1.EdgesBegin(), EE = N1.EdgesEnd();
-           EB != EE; ++EB) {
-        const Node& N2 = this->getNode((*EB)->ToolName());
-
-        if (!N2.ToolPtr) {
-          ++ret;
-          std::cerr << "Error: there is an edge from '" << N1.ToolPtr->Name()
-                    << "' back to the root!\n\n";
-          continue;
-        }
-
-        const char* OutLang = N1.ToolPtr->OutputLanguage();
-        const char** InLangs = N2.ToolPtr->InputLanguages();
-        bool eq = false;
-        for (;*InLangs; ++InLangs) {
-          if (std::strcmp(OutLang, *InLangs) == 0) {
-            eq = true;
-            break;
-          }
-        }
-
-        if (!eq) {
-          ++ret;
-          std::cerr << "Error: Output->input language mismatch in the edge '" <<
-            N1.ToolPtr->Name() << "' -> '" << N2.ToolPtr->Name() << "'!\n";
-
-          std::cerr << "Expected one of { ";
-
-          InLangs = N2.ToolPtr->InputLanguages();
-          for (;*InLangs; ++InLangs) {
-            std::cerr << '\'' << *InLangs << (*(InLangs+1) ? "', " : "'");
-          }
-
-          std::cerr << " }, but got '" << OutLang << "'!\n\n";
-        }
-
-      }
-    }
-  }
-
-  return ret;
-}
-
-int CompilationGraph::CheckMultipleDefaultEdges() const {
-  int ret = 0;
-  InputLanguagesSet Dummy;
-
-  // For all nodes, just iterate over the outgoing edges and check if there is
-  // more than one edge with maximum weight.
-  for (const_nodes_iterator B = this->NodesMap.begin(),
-         E = this->NodesMap.end(); B != E; ++B) {
-    const Node& N = B->second;
-    unsigned MaxWeight = 0;
-
-    // Ignore the root node.
-    if (!N.ToolPtr)
-      continue;
-
-    for (Node::const_iterator EB = N.EdgesBegin(), EE = N.EdgesEnd();
-         EB != EE; ++EB) {
-      unsigned EdgeWeight = (*EB)->Weight(Dummy);
-      if (EdgeWeight > MaxWeight) {
-        MaxWeight = EdgeWeight;
-      }
-      else if (EdgeWeight == MaxWeight) {
-        ++ret;
-        std::cerr
-          << "Error: there are multiple maximal edges stemming from the '"
-          << N.ToolPtr->Name() << "' node!\n\n";
-        break;
-      }
-    }
-  }
-
-  return ret;
-}
-
-int CompilationGraph::CheckCycles() {
-  unsigned deleted = 0;
-  std::queue<Node*> Q;
-  Q.push(&getNode("root"));
-
-  // Try to delete all nodes that have no ingoing edges, starting from the
-  // root. If there are any nodes left after this operation, then we have a
-  // cycle. This relies on '--check-graph' not performing the topological sort.
-  while (!Q.empty()) {
-    Node* A = Q.front();
-    Q.pop();
-    ++deleted;
-
-    for (Node::iterator EB = A->EdgesBegin(), EE = A->EdgesEnd();
-         EB != EE; ++EB) {
-      Node* B = &getNode((*EB)->ToolName());
-      B->DecrInEdges();
-      if (B->HasNoInEdges())
-        Q.push(B);
-    }
-  }
-
-  if (deleted != NodesMap.size()) {
-    std::cerr << "Error: there are cycles in the compilation graph!\n"
-              << "Try inspecting the diagram produced by "
-      "'llvmc --view-graph'.\n\n";
-    return 1;
-  }
-
-  return 0;
-}
-
-int CompilationGraph::Check () {
-  // We try to catch as many errors as we can in one go.
-  int ret = 0;
-
-  // Check that output/input language names match.
-  ret += this->CheckLanguageNames();
-
-  // Check for multiple default edges.
-  ret += this->CheckMultipleDefaultEdges();
-
-  // Check for cycles.
-  ret += this->CheckCycles();
-
-  return ret;
-}
-
-// Code related to graph visualization.
-
-namespace llvm {
-  template <>
-  struct DOTGraphTraits<llvmc::CompilationGraph*>
-    : public DefaultDOTGraphTraits
-  {
-
-    template<typename GraphType>
-    static std::string getNodeLabel(const Node* N, const GraphType&)
-    {
-      if (N->ToolPtr)
-        if (N->ToolPtr->IsJoin())
-          return N->Name() + "\n (join" +
-            (N->HasChildren() ? ")"
-             : std::string(": ") + N->ToolPtr->OutputLanguage() + ')');
-        else
-          return N->Name();
-      else
-        return "root";
-    }
-
-    template<typename EdgeIter>
-    static std::string getEdgeSourceLabel(const Node* N, EdgeIter I) {
-      if (N->ToolPtr) {
-        return N->ToolPtr->OutputLanguage();
-      }
-      else {
-        const char** InLangs = I->ToolPtr->InputLanguages();
-        std::string ret;
-
-        for (; *InLangs; ++InLangs) {
-          if (*(InLangs + 1)) {
-            ret += *InLangs;
-            ret +=  ", ";
-          }
-          else {
-            ret += *InLangs;
-          }
-        }
-
-        return ret;
-      }
-    }
-  };
-
-}
-
-void CompilationGraph::writeGraph() {
-  std::ofstream O("compilation-graph.dot");
-
-  if (O.good()) {
-    llvm::WriteGraph(this, "compilation-graph");
-    O.close();
-  }
-  else {
-    throw std::runtime_error("Error opening file 'compilation-graph.dot'"
-                             " for writing!");
-  }
-}
-
-void CompilationGraph::viewGraph() {
-  llvm::ViewGraph(this, "compilation-graph");
-}
diff --git a/tools/llvmc/driver/Error.h b/tools/llvmc/driver/Error.h
deleted file mode 100644
index c0aaff1..0000000
--- a/tools/llvmc/driver/Error.h
+++ /dev/null
@@ -1,33 +0,0 @@
-//===--- Error.h - The LLVM Compiler Driver ---------------------*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open
-// Source License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-//  Exception classes for LLVMC.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_TOOLS_LLVMC2_ERROR_H
-#define LLVM_TOOLS_LLVMC2_ERROR_H
-
-#include <stdexcept>
-
-namespace llvmc {
-
-  class error_code: public std::runtime_error {
-    int Code_;
-  public:
-    error_code (int c)
-      : std::runtime_error("Tool returned error code"), Code_(c)
-    {}
-
-    int code() const { return Code_; }
-  };
-
-}
-
-#endif //LLVM_TOOLS_LLVMC2_ERROR_H
diff --git a/tools/llvmc/driver/llvmc.cpp b/tools/llvmc/driver/Main.cpp
index 059e840..16b91a8 100644
--- a/tools/llvmc/driver/llvmc.cpp
+++ b/tools/llvmc/driver/Main.cpp
@@ -1,4 +1,4 @@
-//===--- llvmc.cpp - The LLVM Compiler Driver -------------------*- C++ -*-===//
+//===--- Main.cpp - The LLVM Compiler Driver -------------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -14,9 +14,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "Error.h"
-
 #include "llvm/CompilerDriver/CompilationGraph.h"
+#include "llvm/CompilerDriver/Error.h"
 #include "llvm/CompilerDriver/Plugin.h"
 
 #include "llvm/System/Path.h"
diff --git a/tools/llvmc/driver/Makefile b/tools/llvmc/driver/Makefile
index 107f0de..0e32726 100644
--- a/tools/llvmc/driver/Makefile
+++ b/tools/llvmc/driver/Makefile
@@ -8,12 +8,15 @@
 ##===----------------------------------------------------------------------===##
 
 LEVEL = ../../..
-TOOLNAME = $(DRIVER_NAME)
-LINK_COMPONENTS = support system
-REQUIRES_EH := 1
 
-ifneq ($(BUILTIN_PLUGINS),)
-USEDLIBS = $(patsubst %,plugin_llvmc_%,$(BUILTIN_PLUGINS))
+TOOLNAME = $(LLVMC_BASED_DRIVER_NAME)
+USEDLIBS = CompilerDriver
+
+ifneq ($(LLVMC_BUILTIN_PLUGINS),)
+USEDLIBS += $(patsubst %,plugin_llvmc_%,$(LLVMC_BUILTIN_PLUGINS))
 endif
 
+LINK_COMPONENTS = support system
+REQUIRES_EH := 1
+
 include $(LEVEL)/Makefile.common
diff --git a/tools/llvmc/driver/Plugin.cpp b/tools/llvmc/driver/Plugin.cpp
deleted file mode 100644
index 75abbd0..0000000
--- a/tools/llvmc/driver/Plugin.cpp
+++ /dev/null
@@ -1,73 +0,0 @@
-//===--- Plugin.cpp - The LLVM Compiler Driver ------------------*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open
-// Source License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-//  Plugin support.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/CompilerDriver/Plugin.h"
-
-#include <algorithm>
-#include <vector>
-
-namespace {
-
-  // Registry::Add<> does not do lifetime management (probably issues
-  // with static constructor/destructor ordering), so we have to
-  // implement it here.
-  //
-  // All this static registration/life-before-main model seems
-  // unnecessary convoluted to me.
-
-  static bool pluginListInitialized = false;
-  typedef std::vector<const llvmc::BasePlugin*> PluginList;
-  static PluginList Plugins;
-
-  struct ByPriority {
-    bool operator()(const llvmc::BasePlugin* lhs,
-                    const llvmc::BasePlugin* rhs) {
-      return lhs->Priority() < rhs->Priority();
-    }
-  };
-}
-
-namespace llvmc {
-
-  PluginLoader::PluginLoader() {
-    if (!pluginListInitialized) {
-      for (PluginRegistry::iterator B = PluginRegistry::begin(),
-             E = PluginRegistry::end(); B != E; ++B)
-        Plugins.push_back(B->instantiate());
-      std::sort(Plugins.begin(), Plugins.end(), ByPriority());
-    }
-    pluginListInitialized = true;
-  }
-
-  PluginLoader::~PluginLoader() {
-    if (pluginListInitialized) {
-      for (PluginList::iterator B = Plugins.begin(), E = Plugins.end();
-           B != E; ++B)
-        delete (*B);
-    }
-    pluginListInitialized = false;
-  }
-
-  void PluginLoader::PopulateLanguageMap(LanguageMap& langMap) {
-    for (PluginList::iterator B = Plugins.begin(), E = Plugins.end();
-         B != E; ++B)
-      (*B)->PopulateLanguageMap(langMap);
-  }
-
-  void PluginLoader::PopulateCompilationGraph(CompilationGraph& graph) {
-    for (PluginList::iterator B = Plugins.begin(), E = Plugins.end();
-         B != E; ++B)
-      (*B)->PopulateCompilationGraph(graph);
-  }
-
-}
diff --git a/tools/llvmc/driver/Tool.cpp b/tools/llvmc/driver/Tool.cpp
deleted file mode 100644
index 886b26b..0000000
--- a/tools/llvmc/driver/Tool.cpp
+++ /dev/null
@@ -1,74 +0,0 @@
-//===--- Tool.cpp - The LLVM Compiler Driver --------------------*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open
-// Source License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-//  Tool base class - implementation details.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/CompilerDriver/Tool.h"
-
-#include "llvm/System/Path.h"
-#include "llvm/Support/CommandLine.h"
-
-using namespace llvm;
-using namespace llvmc;
-
-extern cl::opt<std::string> OutputFilename;
-
-namespace {
-  sys::Path MakeTempFile(const sys::Path& TempDir, const std::string& BaseName,
-                         const std::string& Suffix) {
-    sys::Path Out;
-
-    // Make sure we don't end up with path names like '/file.o' if the
-    // TempDir is empty.
-    if (TempDir.empty()) {
-      Out.set(BaseName);
-    }
-    else {
-      Out = TempDir;
-      Out.appendComponent(BaseName);
-    }
-    Out.appendSuffix(Suffix);
-    // NOTE: makeUnique always *creates* a unique temporary file,
-    // which is good, since there will be no races. However, some
-    // tools do not like it when the output file already exists, so
-    // they have to be placated with -f or something like that.
-    Out.makeUnique(true, NULL);
-    return Out;
-  }
-}
-
-sys::Path Tool::OutFilename(const sys::Path& In,
-                            const sys::Path& TempDir,
-                            bool StopCompilation,
-                            const char* OutputSuffix) const {
-  sys::Path Out;
-
-  if (StopCompilation) {
-    if (!OutputFilename.empty()) {
-      Out.set(OutputFilename);
-    }
-    else if (IsJoin()) {
-      Out.set("a");
-      Out.appendSuffix(OutputSuffix);
-    }
-    else {
-      Out.set(In.getBasename());
-      Out.appendSuffix(OutputSuffix);
-    }
-  }
-  else {
-    if (IsJoin())
-      Out = MakeTempFile(TempDir, "tmp", OutputSuffix);
-    else
-      Out = MakeTempFile(TempDir, In.getBasename(), OutputSuffix);
-  }
-  return Out;
-}