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 header file implements the operating system Process concept. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/Config/config.h" 15 #if LLVM_ON_WIN32 16 // This define makes stdlib.h declare the rand_s function. 17 #define _CRT_RAND_S 18 #include <stdlib.h> 19 #endif 20 #include "llvm/Support/ErrorHandling.h" 21 #include "llvm/Support/Process.h" 22 23 using namespace llvm; 24 using namespace sys; 25 26 //===----------------------------------------------------------------------===// 27 //=== WARNING: Implementation here must contain only TRULY operating system 28 //=== independent code. 29 //===----------------------------------------------------------------------===// 30 31 // Empty virtual destructor to anchor the vtable for the process class. 32 process::~process() {} 33 34 self_process *process::get_self() { 35 // Use a function local static for thread safe initialization and allocate it 36 // as a raw pointer to ensure it is never destroyed. 37 static self_process *SP = new self_process(); 38 39 return SP; 40 } 41 42 #if defined(_MSC_VER) 43 // Visual Studio complains that the self_process destructor never exits. This 44 // doesn't make much sense, as that's the whole point of calling abort... Just 45 // silence this warning. 46 #pragma warning(push) 47 #pragma warning(disable:4722) 48 #endif 49 50 // The destructor for the self_process subclass must never actually be 51 // executed. There should be at most one instance of this class, and that 52 // instance should live until the process terminates to avoid the potential for 53 // racy accesses during shutdown. 54 self_process::~self_process() { 55 llvm_unreachable("This destructor must never be executed!"); 56 } 57 58 /// \brief A helper function to compute the elapsed wall-time since the program 59 /// started. 60 /// 61 /// Note that this routine actually computes the elapsed wall time since the 62 /// first time it was called. However, we arrange to have it called during the 63 /// startup of the process to get approximately correct results. 64 static TimeValue getElapsedWallTime() { 65 static TimeValue &StartTime = *new TimeValue(TimeValue::now()); 66 return TimeValue::now() - StartTime; 67 } 68 69 /// \brief A special global variable to ensure we call \c getElapsedWallTime 70 /// during global initialization of the program. 71 /// 72 /// Note that this variable is never referenced elsewhere. Doing so could 73 /// create race conditions during program startup or shutdown. 74 static volatile TimeValue DummyTimeValue = getElapsedWallTime(); 75 76 // Implement this routine by using the static helpers above. They're already 77 // portable. 78 TimeValue self_process::get_wall_time() const { 79 return getElapsedWallTime(); 80 } 81 82 83 #if defined(_MSC_VER) 84 #pragma warning(pop) 85 #endif 86 87 88 #define COLOR(FGBG, CODE, BOLD) "\033[0;" BOLD FGBG CODE "m" 89 90 #define ALLCOLORS(FGBG,BOLD) {\ 91 COLOR(FGBG, "0", BOLD),\ 92 COLOR(FGBG, "1", BOLD),\ 93 COLOR(FGBG, "2", BOLD),\ 94 COLOR(FGBG, "3", BOLD),\ 95 COLOR(FGBG, "4", BOLD),\ 96 COLOR(FGBG, "5", BOLD),\ 97 COLOR(FGBG, "6", BOLD),\ 98 COLOR(FGBG, "7", BOLD)\ 99 } 100 101 static const char colorcodes[2][2][8][10] = { 102 { ALLCOLORS("3",""), ALLCOLORS("3","1;") }, 103 { ALLCOLORS("4",""), ALLCOLORS("4","1;") } 104 }; 105 106 // Include the platform-specific parts of this class. 107 #ifdef LLVM_ON_UNIX 108 #include "Unix/Process.inc" 109 #endif 110 #ifdef LLVM_ON_WIN32 111 #include "Windows/Process.inc" 112 #endif 113