X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FSupport%2FProcess.cpp;h=0d42e0e35b92e7e3691d7b6eb7092375efe03978;hb=6c0e1e0fa658f4e7466c6787aedce992ece2db55;hp=2cff1cebe51f79f98cb8d519622f2a751d58e50f;hpb=c94e593060bd2efb86a4e38c7df8888a01fa7f79;p=oota-llvm.git

diff --git a/lib/Support/Process.cpp b/lib/Support/Process.cpp
index 2cff1cebe51..0d42e0e35b9 100644
--- a/lib/Support/Process.cpp
+++ b/lib/Support/Process.cpp
@@ -7,15 +7,18 @@
 //
 //===----------------------------------------------------------------------===//
 //
-//  This header file implements the operating system Process concept.
+//  This file implements the operating system Process concept.
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/Support/Process.h"
+#include "llvm/ADT/StringExtras.h"
 #include "llvm/Config/config.h"
-#include <cstdlib>
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Process.h"
+#include "llvm/Support/Program.h"
 
-namespace llvm {
+using namespace llvm;
 using namespace sys;
 
 //===----------------------------------------------------------------------===//
@@ -23,17 +26,95 @@ using namespace sys;
 //===          independent code.
 //===----------------------------------------------------------------------===//
 
-unsigned llvm::sys::Process::GetRandomNumber() {
-#if defined(HAVE_ARC4RANDOM)
-  return arc4random();
-#else
-  static int x = (::srand(::time(NULL)), 0);
-  return ::rand();
-#endif
+// Empty virtual destructor to anchor the vtable for the process class.
+process::~process() {}
+
+self_process *process::get_self() {
+  // Use a function local static for thread safe initialization and allocate it
+  // as a raw pointer to ensure it is never destroyed.
+  static self_process *SP = new self_process();
+
+  return SP;
+}
+
+// The destructor for the self_process subclass must never actually be
+// executed. There should be at most one instance of this class, and that
+// instance should live until the process terminates to avoid the potential for
+// racy accesses during shutdown.
+self_process::~self_process() {
+  llvm_unreachable("This destructor must never be executed!");
+}
+
+/// \brief A helper function to compute the elapsed wall-time since the program
+/// started.
+///
+/// Note that this routine actually computes the elapsed wall time since the
+/// first time it was called. However, we arrange to have it called during the
+/// startup of the process to get approximately correct results.
+static TimeValue getElapsedWallTime() {
+  static TimeValue &StartTime = *new TimeValue(TimeValue::now());
+  return TimeValue::now() - StartTime;
+}
+
+/// \brief A special global variable to ensure we call \c getElapsedWallTime
+/// during global initialization of the program.
+///
+/// Note that this variable is never referenced elsewhere. Doing so could
+/// create race conditions during program startup or shutdown.
+static volatile TimeValue DummyTimeValue = getElapsedWallTime();
+
+// Implement this routine by using the static helpers above. They're already
+// portable.
+TimeValue self_process::get_wall_time() const {
+  return getElapsedWallTime();
 }
 
+Optional<std::string> Process::FindInEnvPath(const std::string& EnvName,
+                                             const std::string& FileName)
+{
+  Optional<std::string> FoundPath;
+  Optional<std::string> OptPath = Process::GetEnv(EnvName);
+  if (!OptPath.hasValue())
+    return FoundPath;
+
+  const char EnvPathSeparatorStr[] = {EnvPathSeparator, '\0'};
+  SmallVector<StringRef, 8> Dirs;
+  SplitString(OptPath.getValue(), Dirs, EnvPathSeparatorStr);
+
+  for (const auto &Dir : Dirs) {
+    if (Dir.empty())
+      continue;
+
+    SmallString<128> FilePath(Dir);
+    path::append(FilePath, FileName);
+    if (fs::exists(Twine(FilePath))) {
+      FoundPath = FilePath.str();
+      break;
+    }
+  }
+
+  return FoundPath;
 }
 
+
+#define COLOR(FGBG, CODE, BOLD) "\033[0;" BOLD FGBG CODE "m"
+
+#define ALLCOLORS(FGBG,BOLD) {\
+    COLOR(FGBG, "0", BOLD),\
+    COLOR(FGBG, "1", BOLD),\
+    COLOR(FGBG, "2", BOLD),\
+    COLOR(FGBG, "3", BOLD),\
+    COLOR(FGBG, "4", BOLD),\
+    COLOR(FGBG, "5", BOLD),\
+    COLOR(FGBG, "6", BOLD),\
+    COLOR(FGBG, "7", BOLD)\
+  }
+
+static const char colorcodes[2][2][8][10] = {
+ { ALLCOLORS("3",""), ALLCOLORS("3","1;") },
+ { ALLCOLORS("4",""), ALLCOLORS("4","1;") }
+};
+
 // Include the platform-specific parts of this class.
 #ifdef LLVM_ON_UNIX
 #include "Unix/Process.inc"