path: root/lib/Driver/Driver.cpp

//===--- Driver.cpp - Clang GCC Compatible Driver -----------------------*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "clang/Driver/Driver.h"

#include "clang/Driver/Action.h"
#include "clang/Driver/Arg.h"
#include "clang/Driver/ArgList.h"
#include "clang/Driver/Compilation.h"
#include "clang/Driver/DriverDiagnostic.h"
#include "clang/Driver/HostInfo.h"
#include "clang/Driver/Option.h"
#include "clang/Driver/Options.h"
#include "clang/Driver/Types.h"

#include "llvm/ADT/StringMap.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/System/Path.h"
using namespace clang::driver;

Driver::Driver(const char *_Name, const char *_Dir,
               const char *_DefaultHostTriple,
               Diagnostic &_Diags) 
  : Opts(new OptTable()), Diags(_Diags), 
    Name(_Name), Dir(_Dir), DefaultHostTriple(_DefaultHostTriple),
    Host(0),
    CCCIsCXX(false), CCCEcho(false), 
    CCCNoClang(false), CCCNoClangCXX(false), CCCNoClangCPP(false)
{
  
}

Driver::~Driver() {
  delete Opts;
}

ArgList *Driver::ParseArgStrings(const char **ArgBegin, const char **ArgEnd) {
  ArgList *Args = new ArgList(ArgBegin, ArgEnd);
  
  unsigned Index = 0, End = ArgEnd - ArgBegin;
  while (Index < End) {
    unsigned Prev = Index;
    Arg *A = getOpts().ParseOneArg(*Args, Index, End);
    if (A) {
      if (A->getOption().isUnsupported()) {
        Diag(clang::diag::err_drv_unsupported_opt) << A->getOption().getName();
        continue;
      }

      Args->append(A);
    }

    assert(Index > Prev && "Parser failed to consume argument.");
  }

  return Args;
}

Compilation *Driver::BuildCompilation(int argc, const char **argv) {
  // FIXME: This stuff needs to go into the Compilation, not the
  // driver.
  bool CCCPrintOptions = false, CCCPrintActions = false;

  const char **Start = argv + 1, **End = argv + argc;
  const char *HostTriple = DefaultHostTriple.c_str();

  // Read -ccc args. 
  //
  // FIXME: We need to figure out where this behavior should
  // live. Most of it should be outside in the client; the parts that
  // aren't should have proper options, either by introducing new ones
  // or by overloading gcc ones like -V or -b.
  for (; Start != End && memcmp(*Start, "-ccc-", 5) == 0; ++Start) {
    const char *Opt = *Start + 5;
    
    if (!strcmp(Opt, "print-options")) {
      CCCPrintOptions = true;
    } else if (!strcmp(Opt, "print-phases")) {
      CCCPrintActions = true;
    } else if (!strcmp(Opt, "cxx")) {
      CCCIsCXX = true;
    } else if (!strcmp(Opt, "echo")) {
      CCCEcho = true;
      
    } else if (!strcmp(Opt, "no-clang")) {
      CCCNoClang = true;
    } else if (!strcmp(Opt, "no-clang-cxx")) {
      CCCNoClangCXX = true;
    } else if (!strcmp(Opt, "no-clang-cpp")) {
      CCCNoClangCPP = true;
    } else if (!strcmp(Opt, "clang-archs")) {
      assert(Start+1 < End && "FIXME: -ccc- argument handling.");
      const char *Cur = *++Start;
    
      for (;;) {
        const char *Next = strchr(Cur, ',');

        if (Next) {
          CCCClangArchs.insert(std::string(Cur, Next));
          Cur = Next + 1;
        } else {
          CCCClangArchs.insert(std::string(Cur));
          break;
        }
      }

    } else if (!strcmp(Opt, "host-triple")) {
      assert(Start+1 < End && "FIXME: -ccc- argument handling.");
      HostTriple = *++Start;

    } else {
      // FIXME: Error handling.
      llvm::errs() << "invalid option: " << *Start << "\n";
      exit(1);
    }
  }

  Host = Driver::GetHostInfo(HostTriple);

  ArgList *Args = ParseArgStrings(Start, End);

  // FIXME: This behavior shouldn't be here.
  if (CCCPrintOptions) {
    PrintOptions(*Args);
    exit(0);
  }

  // Construct the list of abstract actions to perform for this
  // compilation.
  ActionList Actions;
  if (Host->useDriverDriver())
    BuildUniversalActions(*Args, Actions);
  else
    BuildActions(*Args, Actions);

  // FIXME: This behavior shouldn't be here.
  if (CCCPrintActions) {
    PrintActions(Actions);
    exit(0);
  }
    
  assert(0 && "FIXME: Implement");

  return new Compilation();
}

void Driver::PrintOptions(const ArgList &Args) const {
  unsigned i = 0;
  for (ArgList::const_iterator it = Args.begin(), ie = Args.end(); 
       it != ie; ++it, ++i) {
    Arg *A = *it;
    llvm::errs() << "Option " << i << " - "
                 << "Name: \"" << A->getOption().getName() << "\", "
                 << "Values: {";
    for (unsigned j = 0; j < A->getNumValues(); ++j) {
      if (j)
        llvm::errs() << ", ";
      llvm::errs() << '"' << A->getValue(Args, j) << '"';
    }
    llvm::errs() << "}\n";
  }
}

void Driver::PrintActions(const ActionList &Actions) const {
  llvm::errs() << "FIXME: Print actions.";
}

void Driver::BuildUniversalActions(ArgList &Args, ActionList &Actions) {
  llvm::StringMap<Arg *> Archs;
  for (ArgList::const_iterator it = Args.begin(), ie = Args.end(); 
       it != ie; ++it) {
    Arg *A = *it;

    if (A->getOption().getId() == options::OPT_arch) {
      // FIXME: We need to handle canonicalization of the specified
      // arch?

      Archs[A->getValue(Args)] = A;
    }
  }

  // When there is no explicit arch for this platform, get one from
  // the host so that -Xarch_ is handled correctly.
  if (!Archs.size()) {
    const char *Arch = Host->getArchName().c_str();
    Archs[Arch] = Args.MakeSeparateArg(getOpts().getOption(options::OPT_arch),
                                       Arch);
  }

  // FIXME: We killed off some others but these aren't yet detected in
  // a functional manner. If we added information to jobs about which
  // "auxiliary" files they wrote then we could detect the conflict
  // these cause downstream.
  if (Archs.size() > 1) {
    // No recovery needed, the point of this is just to prevent
    // overwriting the same files.
    if (const Arg *A = Args.getLastArg(options::OPT_M_Group))
      Diag(clang::diag::err_drv_invalid_opt_with_multiple_archs) 
        << A->getOption().getName();
    if (const Arg *A = Args.getLastArg(options::OPT_save_temps))
      Diag(clang::diag::err_drv_invalid_opt_with_multiple_archs) 
        << A->getOption().getName();
  }

  ActionList SingleActions;
  BuildActions(Args, SingleActions);

  // Add in arch binding and lipo (if necessary) for every top level
  // action.
  for (unsigned i = 0, e = SingleActions.size(); i != e; ++i) {
    Action *Act = SingleActions[i];

    // Make sure we can lipo this kind of output. If not (and it is an
    // actual output) then we disallow, since we can't create an
    // output file with the right name without overwriting it. We
    // could remove this oddity by just changing the output names to
    // include the arch, which would also fix
    // -save-temps. Compatibility wins for now.

    if (Archs.size() > 1 && types::canLipoType(Act->getType()))
      Diag(clang::diag::</