1 //===-- Process.cpp - Implement OS Process Concept --------------*- C++ -*-===//
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 // This file implements the operating system Process concept.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "llvm/ADT/StringExtras.h"
15 #include "llvm/Config/config.h"
16 #include "llvm/Support/ErrorHandling.h"
17 #include "llvm/Support/FileSystem.h"
18 #include "llvm/Support/Process.h"
19 #include "llvm/Support/Program.h"
20
21 using namespace llvm;
22 using namespace sys;
23
24 //===----------------------------------------------------------------------===//
25 //=== WARNING: Implementation here must contain only TRULY operating system
26 //=== independent code.
27 //===----------------------------------------------------------------------===//
28
29 /// \brief A helper function to compute the elapsed wall-time since the program
30 /// started.
31 ///
32 /// Note that this routine actually computes the elapsed wall time since the
33 /// first time it was called. However, we arrange to have it called during the
34 /// startup of the process to get approximately correct results.
getElapsedWallTime()35 static TimeValue getElapsedWallTime() {
36 static TimeValue &StartTime = *new TimeValue(TimeValue::now());
37 return TimeValue::now() - StartTime;
38 }
39
40 /// \brief A special global variable to ensure we call \c getElapsedWallTime
41 /// during global initialization of the program.
42 ///
43 /// Note that this variable is never referenced elsewhere. Doing so could
44 /// create race conditions during program startup or shutdown.
45 static volatile TimeValue DummyTimeValue = getElapsedWallTime();
46
FindInEnvPath(const std::string & EnvName,const std::string & FileName)47 Optional<std::string> Process::FindInEnvPath(const std::string& EnvName,
48 const std::string& FileName)
49 {
50 Optional<std::string> FoundPath;
51 Optional<std::string> OptPath = Process::GetEnv(EnvName);
52 if (!OptPath.hasValue())
53 return FoundPath;
54
55 const char EnvPathSeparatorStr[] = {EnvPathSeparator, '\0'};
56 SmallVector<StringRef, 8> Dirs;
57 SplitString(OptPath.getValue(), Dirs, EnvPathSeparatorStr);
58
59 for (const auto &Dir : Dirs) {
60 if (Dir.empty())
61 continue;
62
63 SmallString<128> FilePath(Dir);
64 path::append(FilePath, FileName);
65 if (fs::exists(Twine(FilePath))) {
66 FoundPath = FilePath.str();
67 break;
68 }
69 }
70
71 return FoundPath;
72 }
73
74
75 #define COLOR(FGBG, CODE, BOLD) "\033[0;" BOLD FGBG CODE "m"
76
77 #define ALLCOLORS(FGBG,BOLD) {\
78 COLOR(FGBG, "0", BOLD),\
79 COLOR(FGBG, "1", BOLD),\
80 COLOR(FGBG, "2", BOLD),\
81 COLOR(FGBG, "3", BOLD),\
82 COLOR(FGBG, "4", BOLD),\
83 COLOR(FGBG, "5", BOLD),\
84 COLOR(FGBG, "6", BOLD),\
85 COLOR(FGBG, "7", BOLD)\
86 }
87
88 static const char colorcodes[2][2][8][10] = {
89 { ALLCOLORS("3",""), ALLCOLORS("3","1;") },
90 { ALLCOLORS("4",""), ALLCOLORS("4","1;") }
91 };
92
93 // Include the platform-specific parts of this class.
94 #ifdef LLVM_ON_UNIX
95 #include "Unix/Process.inc"
96 #endif
97 #ifdef LLVM_ON_WIN32
98 #include "Windows/Process.inc"
99 #endif
100