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 #include "llvm/Support/ErrorHandling.h" 16 #include "llvm/Support/Process.h" 17 18 using namespace llvm; 19 using namespace sys; 20 21 //===----------------------------------------------------------------------===// 22 //=== WARNING: Implementation here must contain only TRULY operating system 23 //=== independent code. 24 //===----------------------------------------------------------------------===// 25 26 // Empty virtual destructor to anchor the vtable for the process class. 27 process::~process() {} 28 29 self_process *process::get_self() { 30 // Use a function local static for thread safe initialization and allocate it 31 // as a raw pointer to ensure it is never destroyed. 32 static self_process *SP = new self_process(); 33 34 return SP; 35 } 36 37 // The destructor for the self_process subclass must never actually be 38 // executed. There should be at most one instance of this class, and that 39 // instance should live until the process terminates to avoid the potential for 40 // racy accesses during shutdown. 41 self_process::~self_process() { 42 llvm_unreachable("This destructor must never be executed!"); 43 } 44 45 /// \brief A helper function to compute the elapsed wall-time since the program 46 /// started. 47 /// 48 /// Note that this routine actually computes the elapsed wall time since the 49 /// first time it was called. However, we arrange to have it called during the 50 /// startup of the process to get approximately correct results. 51 static TimeValue getElapsedWallTime() { 52 static TimeValue &StartTime = *new TimeValue(TimeValue::now()); 53 return TimeValue::now() - StartTime; 54 } 55 56 /// \brief A special global variable to ensure we call \c getElapsedWallTime 57 /// during global initialization of the program. 58 /// 59 /// Note that this variable is never referenced elsewhere. Doing so could 60 /// create race conditions during program startup or shutdown. 61 static volatile TimeValue DummyTimeValue = getElapsedWallTime(); 62 63 // Implement this routine by using the static helpers above. They're already 64 // portable. 65 TimeValue self_process::get_wall_time() const { 66 return getElapsedWallTime(); 67 } 68 69 70 #define COLOR(FGBG, CODE, BOLD) "\033[0;" BOLD FGBG CODE "m" 71 72 #define ALLCOLORS(FGBG,BOLD) {\ 73 COLOR(FGBG, "0", BOLD),\ 74 COLOR(FGBG, "1", BOLD),\ 75 COLOR(FGBG, "2", BOLD),\ 76 COLOR(FGBG, "3", BOLD),\ 77 COLOR(FGBG, "4", BOLD),\ 78 COLOR(FGBG, "5", BOLD),\ 79 COLOR(FGBG, "6", BOLD),\ 80 COLOR(FGBG, "7", BOLD)\ 81 } 82 83 static const char colorcodes[2][2][8][10] = { 84 { ALLCOLORS("3",""), ALLCOLORS("3","1;") }, 85 { ALLCOLORS("4",""), ALLCOLORS("4","1;") } 86 }; 87 88 // Include the platform-specific parts of this class. 89 #ifdef LLVM_ON_UNIX 90 #include "Unix/Process.inc" 91 #endif 92 #ifdef LLVM_ON_WIN32 93 #include "Windows/Process.inc" 94 #endif 95