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annotate include/llvm/Support/Process.h @ 83:60c9769439b8 LLVM3.7

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LLVM 3.7
author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Wed, 18 Feb 2015 14:55:36 +0900
parents 54457678186b
children 1172e4bd9c6f
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1 //===- llvm/Support/Process.h -----------------------------------*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 /// \file
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10 ///
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11 /// Provides a library for accessing information about this process and other
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12 /// processes on the operating system. Also provides means of spawning
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13 /// subprocess for commands. The design of this library is modeled after the
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14 /// proposed design of the Boost.Process library, and is design specifically to
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15 /// follow the style of standard libraries and potentially become a proposal
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16 /// for a standard library.
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17 ///
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18 /// This file declares the llvm::sys::Process class which contains a collection
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19 /// of legacy static interfaces for extracting various information about the
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20 /// current process. The goal is to migrate users of this API over to the new
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21 /// interfaces.
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22 ///
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23 //===----------------------------------------------------------------------===//
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24
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25 #ifndef LLVM_SUPPORT_PROCESS_H
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26 #define LLVM_SUPPORT_PROCESS_H
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27
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28 #include "llvm/ADT/ArrayRef.h"
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29 #include "llvm/ADT/Optional.h"
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30 #include "llvm/Config/llvm-config.h"
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31 #include "llvm/Support/Allocator.h"
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32 #include "llvm/Support/DataTypes.h"
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33 #include "llvm/Support/TimeValue.h"
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34 #include <system_error>
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35
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36 namespace llvm {
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37 class StringRef;
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38
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39 namespace sys {
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40
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41
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42 /// \brief A collection of legacy interfaces for querying information about the
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43 /// current executing process.
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44 class Process {
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45 public:
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46 static unsigned getPageSize();
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47
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48 /// \brief Return process memory usage.
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49 /// This static function will return the total amount of memory allocated
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50 /// by the process. This only counts the memory allocated via the malloc,
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51 /// calloc and realloc functions and includes any "free" holes in the
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52 /// allocated space.
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53 static size_t GetMallocUsage();
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54
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55 /// This static function will set \p user_time to the amount of CPU time
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56 /// spent in user (non-kernel) mode and \p sys_time to the amount of CPU
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57 /// time spent in system (kernel) mode. If the operating system does not
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58 /// support collection of these metrics, a zero TimeValue will be for both
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59 /// values.
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60 /// \param elapsed Returns the TimeValue::now() giving current time
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61 /// \param user_time Returns the current amount of user time for the process
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62 /// \param sys_time Returns the current amount of system time for the process
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63 static void GetTimeUsage(TimeValue &elapsed, TimeValue &user_time,
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64 TimeValue &sys_time);
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65
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66 /// This function makes the necessary calls to the operating system to
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67 /// prevent core files or any other kind of large memory dumps that can
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68 /// occur when a program fails.
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69 /// @brief Prevent core file generation.
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70 static void PreventCoreFiles();
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71
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72 // This function returns the environment variable \arg name's value as a UTF-8
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73 // string. \arg Name is assumed to be in UTF-8 encoding too.
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74 static Optional<std::string> GetEnv(StringRef name);
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75
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76 /// This function searches for an existing file in the list of directories
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77 /// in a PATH like environment variable, and returns the first file found,
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78 /// according to the order of the entries in the PATH like environment
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79 /// variable.
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80 static Optional<std::string> FindInEnvPath(const std::string& EnvName,
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81 const std::string& FileName);
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82
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83 /// This function returns a SmallVector containing the arguments passed from
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84 /// the operating system to the program. This function expects to be handed
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85 /// the vector passed in from main.
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86 static std::error_code
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87 GetArgumentVector(SmallVectorImpl<const char *> &Args,
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88 ArrayRef<const char *> ArgsFromMain,
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89 SpecificBumpPtrAllocator<char> &ArgAllocator);
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90
83
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91 // This functions ensures that the standard file descriptors (input, output,
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92 // and error) are properly mapped to a file descriptor before we use any of
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93 // them. This should only be called by standalone programs, library
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94 // components should not call this.
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95 static std::error_code FixupStandardFileDescriptors();
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96
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97 // This function safely closes a file descriptor. It is not safe to retry
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98 // close(2) when it returns with errno equivalent to EINTR; this is because
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99 // *nixen cannot agree if the file descriptor is, in fact, closed when this
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100 // occurs.
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101 //
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102 // N.B. Some operating systems, due to thread cancellation, cannot properly
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103 // guarantee that it will or will not be closed one way or the other!
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104 static std::error_code SafelyCloseFileDescriptor(int FD);
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105
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106 /// This function determines if the standard input is connected directly
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107 /// to a user's input (keyboard probably), rather than coming from a file
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108 /// or pipe.
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109 static bool StandardInIsUserInput();
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110
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111 /// This function determines if the standard output is connected to a
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112 /// "tty" or "console" window. That is, the output would be displayed to
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113 /// the user rather than being put on a pipe or stored in a file.
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114 static bool StandardOutIsDisplayed();
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115
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116 /// This function determines if the standard error is connected to a
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117 /// "tty" or "console" window. That is, the output would be displayed to
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118 /// the user rather than being put on a pipe or stored in a file.
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119 static bool StandardErrIsDisplayed();
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120
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121 /// This function determines if the given file descriptor is connected to
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122 /// a "tty" or "console" window. That is, the output would be displayed to
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123 /// the user rather than being put on a pipe or stored in a file.
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124 static bool FileDescriptorIsDisplayed(int fd);
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125
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126 /// This function determines if the given file descriptor is displayd and
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127 /// supports colors.
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128 static bool FileDescriptorHasColors(int fd);
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129
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130 /// This function determines the number of columns in the window
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131 /// if standard output is connected to a "tty" or "console"
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132 /// window. If standard output is not connected to a tty or
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133 /// console, or if the number of columns cannot be determined,
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134 /// this routine returns zero.
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135 static unsigned StandardOutColumns();
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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136
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137 /// This function determines the number of columns in the window
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138 /// if standard error is connected to a "tty" or "console"
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139 /// window. If standard error is not connected to a tty or
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140 /// console, or if the number of columns cannot be determined,
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141 /// this routine returns zero.
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142 static unsigned StandardErrColumns();
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff changeset
143
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144 /// This function determines whether the terminal connected to standard
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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145 /// output supports colors. If standard output is not connected to a
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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146 /// terminal, this function returns false.
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147 static bool StandardOutHasColors();
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148
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149 /// This function determines whether the terminal connected to standard
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150 /// error supports colors. If standard error is not connected to a
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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151 /// terminal, this function returns false.
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152 static bool StandardErrHasColors();
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153
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154 /// Enables or disables whether ANSI escape sequences are used to output
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155 /// colors. This only has an effect on Windows.
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156 /// Note: Setting this option is not thread-safe and should only be done
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157 /// during initialization.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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158 static void UseANSIEscapeCodes(bool enable);
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159
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160 /// Whether changing colors requires the output to be flushed.
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diff changeset
161 /// This is needed on systems that don't support escape sequences for
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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162 /// changing colors.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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163 static bool ColorNeedsFlush();
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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164
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165 /// This function returns the colorcode escape sequences.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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166 /// If ColorNeedsFlush() is true then this function will change the colors
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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167 /// and return an empty escape sequence. In that case it is the
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168 /// responsibility of the client to flush the output stream prior to
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169 /// calling this function.
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170 static const char *OutputColor(char c, bool bold, bool bg);
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diff changeset
171
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172 /// Same as OutputColor, but only enables the bold attribute.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff changeset
173 static const char *OutputBold(bool bg);
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
174
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parents:
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175 /// This function returns the escape sequence to reverse forground and
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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176 /// background colors.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
177 static const char *OutputReverse();
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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178
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parents:
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179 /// Resets the terminals colors, or returns an escape sequence to do so.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
180 static const char *ResetColor();
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
181
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parents:
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182 /// Get the result of a process wide random number generator. The
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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183 /// generator will be automatically seeded in non-deterministic fashion.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
184 static unsigned GetRandomNumber();
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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185 };
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
186
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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187 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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188 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
189
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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190 #endif