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      1 //===--- Compilation.cpp - Compilation Task Implementation ----------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 
     10 #include "clang/Driver/Compilation.h"
     11 
     12 #include "clang/Driver/Action.h"
     13 #include "clang/Driver/ArgList.h"
     14 #include "clang/Driver/Driver.h"
     15 #include "clang/Driver/DriverDiagnostic.h"
     16 #include "clang/Driver/Options.h"
     17 #include "clang/Driver/ToolChain.h"
     18 
     19 #include "llvm/ADT/STLExtras.h"
     20 #include "llvm/Support/raw_ostream.h"
     21 #include "llvm/Support/Program.h"
     22 #include <sys/stat.h>
     23 #include <errno.h>
     24 
     25 using namespace clang::driver;
     26 using namespace clang;
     27 
     28 Compilation::Compilation(const Driver &D, const ToolChain &_DefaultToolChain,
     29                          InputArgList *_Args, DerivedArgList *_TranslatedArgs)
     30   : TheDriver(D), DefaultToolChain(_DefaultToolChain), Args(_Args),
     31     TranslatedArgs(_TranslatedArgs), Redirects(0) {
     32 }
     33 
     34 Compilation::~Compilation() {
     35   delete TranslatedArgs;
     36   delete Args;
     37 
     38   // Free any derived arg lists.
     39   for (llvm::DenseMap<std::pair<const ToolChain*, const char*>,
     40                       DerivedArgList*>::iterator it = TCArgs.begin(),
     41          ie = TCArgs.end(); it != ie; ++it)
     42     if (it->second != TranslatedArgs)
     43       delete it->second;
     44 
     45   // Free the actions, if built.
     46   for (ActionList::iterator it = Actions.begin(), ie = Actions.end();
     47        it != ie; ++it)
     48     delete *it;
     49 
     50   // Free redirections of stdout/stderr.
     51   if (Redirects) {
     52     delete Redirects[1];
     53     delete Redirects[2];
     54     delete [] Redirects;
     55   }
     56 }
     57 
     58 const DerivedArgList &Compilation::getArgsForToolChain(const ToolChain *TC,
     59                                                        const char *BoundArch) {
     60   if (!TC)
     61     TC = &DefaultToolChain;
     62 
     63   DerivedArgList *&Entry = TCArgs[std::make_pair(TC, BoundArch)];
     64   if (!Entry) {
     65     Entry = TC->TranslateArgs(*TranslatedArgs, BoundArch);
     66     if (!Entry)
     67       Entry = TranslatedArgs;
     68   }
     69 
     70   return *Entry;
     71 }
     72 
     73 void Compilation::PrintJob(raw_ostream &OS, const Job &J,
     74                            const char *Terminator, bool Quote) const {
     75   if (const Command *C = dyn_cast<Command>(&J)) {
     76     OS << " \"" << C->getExecutable() << '"';
     77     for (ArgStringList::const_iterator it = C->getArguments().begin(),
     78            ie = C->getArguments().end(); it != ie; ++it) {
     79       OS << ' ';
     80       if (!Quote && !std::strpbrk(*it, " \"\\$")) {
     81         OS << *it;
     82         continue;
     83       }
     84 
     85       // Quote the argument and escape shell special characters; this isn't
     86       // really complete but is good enough.
     87       OS << '"';
     88       for (const char *s = *it; *s; ++s) {
     89         if (*s == '"' || *s == '\\' || *s == '$')
     90           OS << '\\';
     91         OS << *s;
     92       }
     93       OS << '"';
     94     }
     95     OS << Terminator;
     96   } else {
     97     const JobList *Jobs = cast<JobList>(&J);
     98     for (JobList::const_iterator
     99            it = Jobs->begin(), ie = Jobs->end(); it != ie; ++it)
    100       PrintJob(OS, **it, Terminator, Quote);
    101   }
    102 }
    103 
    104 bool Compilation::CleanupFileList(const ArgStringList &Files,
    105                                   bool IssueErrors) const {
    106   bool Success = true;
    107 
    108   for (ArgStringList::const_iterator
    109          it = Files.begin(), ie = Files.end(); it != ie; ++it) {
    110 
    111     llvm::sys::Path P(*it);
    112     std::string Error;
    113 
    114     // Don't try to remove files which we don't have write access to (but may be
    115     // able to remove). Underlying tools may have intentionally not overwritten
    116     // them.
    117     if (!P.canWrite())
    118       continue;
    119 
    120     if (P.eraseFromDisk(false, &Error)) {
    121       // Failure is only failure if the file exists and is "regular". There is
    122       // a race condition here due to the limited interface of
    123       // llvm::sys::Path, we want to know if the removal gave ENOENT.
    124 
    125       // FIXME: Grumble, P.exists() is broken. PR3837.
    126       struct stat buf;
    127       if (::stat(P.c_str(), &buf) == 0 ? (buf.st_mode & S_IFMT) == S_IFREG :
    128                                          (errno != ENOENT)) {
    129         if (IssueErrors)
    130           getDriver().Diag(clang::diag::err_drv_unable_to_remove_file)
    131             << Error;
    132         Success = false;
    133       }
    134     }
    135   }
    136 
    137   return Success;
    138 }
    139 
    140 int Compilation::ExecuteCommand(const Command &C,
    141                                 const Command *&FailingCommand) const {
    142   llvm::sys::Path Prog(C.getExecutable());
    143   const char **Argv = new const char*[C.getArguments().size() + 2];
    144   Argv[0] = C.getExecutable();
    145   std::copy(C.getArguments().begin(), C.getArguments().end(), Argv+1);
    146   Argv[C.getArguments().size() + 1] = 0;
    147 
    148   if ((getDriver().CCCEcho || getDriver().CCPrintOptions ||
    149        getArgs().hasArg(options::OPT_v)) && !getDriver().CCGenDiagnostics) {
    150     raw_ostream *OS = &llvm::errs();
    151 
    152     // Follow gcc implementation of CC_PRINT_OPTIONS; we could also cache the
    153     // output stream.
    154     if (getDriver().CCPrintOptions && getDriver().CCPrintOptionsFilename) {
    155       std::string Error;
    156       OS = new llvm::raw_fd_ostream(getDriver().CCPrintOptionsFilename,
    157                                     Error,
    158                                     llvm::raw_fd_ostream::F_Append);
    159       if (!Error.empty()) {
    160         getDriver().Diag(clang::diag::err_drv_cc_print_options_failure)
    161           << Error;
    162         FailingCommand = &C;
    163         delete OS;
    164         return 1;
    165       }
    166     }
    167 
    168     if (getDriver().CCPrintOptions)
    169       *OS << "[Logging clang options]";
    170 
    171     PrintJob(*OS, C, "\n", /*Quote=*/getDriver().CCPrintOptions);
    172 
    173     if (OS != &llvm::errs())
    174       delete OS;
    175   }
    176 
    177   std::string Error;
    178   int Res =
    179     llvm::sys::Program::ExecuteAndWait(Prog, Argv,
    180                                        /*env*/0, Redirects,
    181                                        /*secondsToWait*/0, /*memoryLimit*/0,
    182                                        &Error);
    183   if (!Error.empty()) {
    184     assert(Res && "Error string set with 0 result code!");
    185     getDriver().Diag(clang::diag::err_drv_command_failure) << Error;
    186   }
    187 
    188   if (Res)
    189     FailingCommand = &C;
    190 
    191   delete[] Argv;
    192   return Res;
    193 }
    194 
    195 int Compilation::ExecuteJob(const Job &J,
    196                             const Command *&FailingCommand) const {
    197   if (const Command *C = dyn_cast<Command>(&J)) {
    198     return ExecuteCommand(*C, FailingCommand);
    199   } else {
    200     const JobList *Jobs = cast<JobList>(&J);
    201     for (JobList::const_iterator
    202            it = Jobs->begin(), ie = Jobs->end(); it != ie; ++it)
    203       if (int Res = ExecuteJob(**it, FailingCommand))
    204         return Res;
    205     return 0;
    206   }
    207 }
    208 
    209 void Compilation::initCompilationForDiagnostics(void) {
    210   // Free actions and jobs.
    211   DeleteContainerPointers(Actions);
    212   Jobs.clear();
    213 
    214   // Clear temporary/results file lists.
    215   TempFiles.clear();
    216   ResultFiles.clear();
    217 
    218   // Remove any user specified output.  Claim any unclaimed arguments, so as
    219   // to avoid emitting warnings about unused args.
    220   if (TranslatedArgs->hasArg(options::OPT_o))
    221     TranslatedArgs->eraseArg(options::OPT_o);
    222   TranslatedArgs->ClaimAllArgs();
    223 
    224   // Redirect stdout/stderr to /dev/null.
    225   Redirects = new const llvm::sys::Path*[3]();
    226   Redirects[1] = new const llvm::sys::Path();
    227   Redirects[2] = new const llvm::sys::Path();
    228 }
    229