lib/CompilerDriver/Action.cpp

   1 //===--- Action.cpp - The LLVM Compiler Driver ------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open
   6 // Source License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 //  Action class - implementation and auxiliary functions.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/CompilerDriver/Action.h"
  15 #include "llvm/CompilerDriver/BuiltinOptions.h"
  16 #include "llvm/CompilerDriver/Error.h"
  17
  18 #include "llvm/Support/raw_ostream.h"
  19 #include "llvm/Support/SystemUtils.h"
  20 #include "llvm/System/Program.h"
  21 #include "llvm/System/TimeValue.h"
  22
  23 #include <stdexcept>
  24 #include <string>
  25
  26 using namespace llvm;
  27 using namespace llvmc;
  28
  29 namespace llvmc {
  30
  31 extern int Main(int argc, char** argv);
  32 extern const char* ProgramName;
  33
  34 }
  35
  36 namespace {
  37
  38   void PrintString (const std::string& str) {
  39     errs() << str << ' ';
  40   }
  41
  42   void PrintCommand (const std::string& Cmd, const StrVector& Args) {
  43     errs() << Cmd << ' ';
  44     std::for_each(Args.begin(), Args.end(), &PrintString);
  45     errs() << '\n';
  46   }
  47
  48   bool IsSegmentationFault (int returnCode) {
  49 #ifdef LLVM_ON_WIN32
  50     return (returnCode >= 0xc0000000UL)
  51 #else
  52     return (returnCode < 0);
  53 #endif
  54   }
  55
  56   int ExecuteProgram (const std::string& name,
  57                       const StrVector& args) {
  58     sys::Path prog = sys::Program::FindProgramByName(name);
  59
  60     if (prog.isEmpty()) {
  61       prog = FindExecutable(name, ProgramName, (void *)(intptr_t)&Main);
  62       if (prog.isEmpty()) {
  63         PrintError("Can't find program '" + name + "'");
  64         return -1;
  65       }
  66     }
  67     if (!prog.canExecute()) {
  68       PrintError("Program '" + name + "' is not executable.");
  69       return -1;
  70     }
  71
  72     // Build the command line vector and the redirects array.
  73     const sys::Path* redirects[3] = {0,0,0};
  74     sys::Path stdout_redirect;
  75
  76     std::vector<const char*> argv;
  77     argv.reserve((args.size()+2));
  78     argv.push_back(name.c_str());
  79
  80     for (StrVector::const_iterator B = args.begin(), E = args.end();
  81          B!=E; ++B) {
  82       if (*B == ">") {
  83         ++B;
  84         stdout_redirect.set(*B);
  85         redirects[1] = &stdout_redirect;
  86       }
  87       else {
  88         argv.push_back((*B).c_str());
  89       }
  90     }
  91     argv.push_back(0);  // null terminate list.
  92
  93     // Invoke the program.
  94     int ret = sys::Program::ExecuteAndWait(prog, &argv[0], 0, &redirects[0]);
  95
  96     if (IsSegmentationFault(ret)) {
  97       errs() << "Segmentation fault: ";
  98       PrintCommand(name, args);
  99     }
 100
 101     return ret;
 102   }
 103 }
 104
 105 namespace llvmc {
 106   void AppendToGlobalTimeLog (const std::string& cmd, double time);
 107 }
 108
 109 int llvmc::Action::Execute () const {
 110   if (DryRun || VerboseMode)
 111     PrintCommand(Command_, Args_);
 112
 113   if (!DryRun) {
 114     if (Time) {
 115       sys::TimeValue now = sys::TimeValue::now();
 116       int ret = ExecuteProgram(Command_, Args_);
 117       sys::TimeValue now2 = sys::TimeValue::now();
 118       now2 -= now;
 119       double elapsed = now2.seconds()  + now2.microseconds()  / 1000000.0;
 120       AppendToGlobalTimeLog(Command_, elapsed);
 121
 122       return ret;
 123     }
 124     else {
 125       return ExecuteProgram(Command_, Args_);
 126     }
 127   }
 128
 129   return 0;
 130 }