lib/Support/Process.cpp

   1 //===-- Process.cpp - Implement OS Process Concept --------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 //  This file implements the operating system Process concept.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "llvm/Support/Process.h"
  14 #include "llvm/ADT/STLExtras.h"
  15 #include "llvm/ADT/StringExtras.h"
  16 #include "llvm/Config/llvm-config.h"
  17 #include "llvm/Config/config.h"
  18 #include "llvm/Support/FileSystem.h"
  19 #include "llvm/Support/Path.h"
  20 #include "llvm/Support/Program.h"
  21
  22 using namespace llvm;
  23 using namespace sys;
  24
  25 //===----------------------------------------------------------------------===//
  26 //=== WARNING: Implementation here must contain only TRULY operating system
  27 //===          independent code.
  28 //===----------------------------------------------------------------------===//
  29
  30 Optional<std::string> Process::FindInEnvPath(StringRef EnvName,
  31                                              StringRef FileName) {
  32   return FindInEnvPath(EnvName, FileName, {});
  33 }
  34
  35 Optional<std::string> Process::FindInEnvPath(StringRef EnvName,
  36                                              StringRef FileName,
  37                                              ArrayRef<std::string> IgnoreList) {
  38   assert(!path::is_absolute(FileName));
  39   Optional<std::string> FoundPath;
  40   Optional<std::string> OptPath = Process::GetEnv(EnvName);
  41   if (!OptPath.hasValue())
  42     return FoundPath;
  43
  44   const char EnvPathSeparatorStr[] = {EnvPathSeparator, '\0'};
  45   SmallVector<StringRef, 8> Dirs;
  46   SplitString(OptPath.getValue(), Dirs, EnvPathSeparatorStr);
  47
  48   for (StringRef Dir : Dirs) {
  49     if (Dir.empty())
  50       continue;
  51
  52     if (any_of(IgnoreList, [&](StringRef S) { return fs::equivalent(S, Dir); }))
  53       continue;
  54
  55     SmallString<128> FilePath(Dir);
  56     path::append(FilePath, FileName);
  57     if (fs::exists(Twine(FilePath))) {
  58       FoundPath = FilePath.str();
  59       break;
  60     }
  61   }
  62
  63   return FoundPath;
  64 }
  65
  66
  67 #define COLOR(FGBG, CODE, BOLD) "\033[0;" BOLD FGBG CODE "m"
  68
  69 #define ALLCOLORS(FGBG,BOLD) {\
  70     COLOR(FGBG, "0", BOLD),\
  71     COLOR(FGBG, "1", BOLD),\
  72     COLOR(FGBG, "2", BOLD),\
  73     COLOR(FGBG, "3", BOLD),\
  74     COLOR(FGBG, "4", BOLD),\
  75     COLOR(FGBG, "5", BOLD),\
  76     COLOR(FGBG, "6", BOLD),\
  77     COLOR(FGBG, "7", BOLD)\
  78   }
  79
  80 static const char colorcodes[2][2][8][10] = {
  81  { ALLCOLORS("3",""), ALLCOLORS("3","1;") },
  82  { ALLCOLORS("4",""), ALLCOLORS("4","1;") }
  83 };
  84
  85 // A CMake option controls wheter we emit core dumps by default. An application
  86 // may disable core dumps by calling Process::PreventCoreFiles().
  87 static bool coreFilesPrevented = !LLVM_ENABLE_CRASH_DUMPS;
  88
  89 bool Process::AreCoreFilesPrevented() { return coreFilesPrevented; }
  90
  91 // Include the platform-specific parts of this class.
  92 #ifdef LLVM_ON_UNIX
  93 #include "Unix/Process.inc"
  94 #endif
  95 #ifdef _WIN32
  96 #include "Windows/Process.inc"
  97 #endif