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