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/config.h"
17 #include "llvm/Config/llvm-config.h"
18 #include "llvm/Support/CrashRecoveryContext.h"
19 #include "llvm/Support/FileSystem.h"
20 #include "llvm/Support/Path.h"
21 #include "llvm/Support/Program.h"
22
23 #include <optional>
24 #include <stdlib.h> // for _Exit
25
26 using namespace llvm;
27 using namespace sys;
28
29 //===----------------------------------------------------------------------===//
30 //=== WARNING: Implementation here must contain only TRULY operating system
31 //=== independent code.
32 //===----------------------------------------------------------------------===//
33
34 std::optional<std::string>
FindInEnvPath(StringRef EnvName,StringRef FileName,char Separator)35 Process::FindInEnvPath(StringRef EnvName, StringRef FileName, char Separator) {
36 return FindInEnvPath(EnvName, FileName, {}, Separator);
37 }
38
39 std::optional<std::string>
FindInEnvPath(StringRef EnvName,StringRef FileName,ArrayRef<std::string> IgnoreList,char Separator)40 Process::FindInEnvPath(StringRef EnvName, StringRef FileName,
41 ArrayRef<std::string> IgnoreList, char Separator) {
42 assert(!path::is_absolute(FileName));
43 std::optional<std::string> FoundPath;
44 std::optional<std::string> OptPath = Process::GetEnv(EnvName);
45 if (!OptPath)
46 return FoundPath;
47
48 const char EnvPathSeparatorStr[] = {Separator, '\0'};
49 SmallVector<StringRef, 8> Dirs;
50 SplitString(*OptPath, Dirs, EnvPathSeparatorStr);
51
52 for (StringRef Dir : Dirs) {
53 if (Dir.empty())
54 continue;
55
56 if (any_of(IgnoreList, [&](StringRef S) { return fs::equivalent(S, Dir); }))
57 continue;
58
59 SmallString<128> FilePath(Dir);
60 path::append(FilePath, FileName);
61 if (fs::exists(Twine(FilePath))) {
62 FoundPath = std::string(FilePath);
63 break;
64 }
65 }
66
67 return FoundPath;
68 }
69
70
71 #define COLOR(FGBG, CODE, BOLD) "\033[0;" BOLD FGBG CODE "m"
72
73 #define ALLCOLORS(FGBG,BOLD) {\
74 COLOR(FGBG, "0", BOLD),\
75 COLOR(FGBG, "1", BOLD),\
76 COLOR(FGBG, "2", BOLD),\
77 COLOR(FGBG, "3", BOLD),\
78 COLOR(FGBG, "4", BOLD),\
79 COLOR(FGBG, "5", BOLD),\
80 COLOR(FGBG, "6", BOLD),\
81 COLOR(FGBG, "7", BOLD)\
82 }
83
84 static const char colorcodes[2][2][8][10] = {
85 { ALLCOLORS("3",""), ALLCOLORS("3","1;") },
86 { ALLCOLORS("4",""), ALLCOLORS("4","1;") }
87 };
88
89 // A CMake option controls wheter we emit core dumps by default. An application
90 // may disable core dumps by calling Process::PreventCoreFiles().
91 static bool coreFilesPrevented = !LLVM_ENABLE_CRASH_DUMPS;
92
AreCoreFilesPrevented()93 bool Process::AreCoreFilesPrevented() { return coreFilesPrevented; }
94
Exit(int RetCode,bool NoCleanup)95 [[noreturn]] void Process::Exit(int RetCode, bool NoCleanup) {
96 if (CrashRecoveryContext *CRC = CrashRecoveryContext::GetCurrent())
97 CRC->HandleExit(RetCode);
98
99 if (NoCleanup)
100 ExitNoCleanup(RetCode);
101 else
102 ::exit(RetCode);
103 }
104
105 // Include the platform-specific parts of this class.
106 #ifdef LLVM_ON_UNIX
107 #include "Unix/Process.inc"
108 #endif
109 #ifdef _WIN32
110 #include "Windows/Process.inc"
111 #endif
112