Remove the program class.

It was only used to implement ExecuteAndWait and ExecuteNoWait. Expose just
those two functions and make Execute and Wait implementations details.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183864 91177308-0d34-0410-b5e6-96231b3b80d8

12 files changed, 99 insertions, 184 deletions

diff --git a/include/llvm/Support/Program.h b/include/llvm/Support/Program.h
index db12a153f6..dac377aaa7 100644
--- a/include/llvm/Support/Program.h
+++ b/include/llvm/Support/Program.h
@@ -22,49 +22,42 @@
 namespace llvm {
 class error_code;
 namespace sys {
-
-  // TODO: Add operations to communicate with the process, redirect its I/O,
-  // etc.
-
-  /// This class provides an abstraction for programs that are executable by the
-  /// operating system. It provides a platform generic way to find executable
-  /// programs from the path and to execute them in various ways. The sys::Path
-  /// class is used to specify the location of the Program.
-  /// @since 1.4
-  /// @brief An abstraction for finding and executing programs.
-  class Program {
-    /// Opaque handle for target specific data.
-    void *Data_;
-
-    // Noncopyable.
-    Program(const Program& other) LLVM_DELETED_FUNCTION;
-    Program& operator=(const Program& other) LLVM_DELETED_FUNCTION;
-
-    /// @name Methods
-    /// @{
-
-    Program();
-    ~Program();
-
-    /// This function executes the program using the \p arguments provided.  The
-    /// invoked program will inherit the stdin, stdout, and stderr file
-    /// descriptors, the environment and other configuration settings of the
-    /// invoking program. If Path::executable() does not return true when this
-    /// function is called then a std::string is thrown.
-    /// @returns false in case of error, true otherwise.
-    /// @see FindProgramByName
-    /// @brief Executes the program with the given set of \p args.
-    bool Execute
-    ( const Path& path,  ///< sys::Path object providing the path of the
+  /// This static constructor (factory) will attempt to locate a program in
+  /// the operating system's file system using some pre-determined set of
+  /// locations to search (e.g. the PATH on Unix). Paths with slashes are
+  /// returned unmodified.
+  /// @returns A Path object initialized to the path of the program or a
+  /// Path object that is empty (invalid) if the program could not be found.
+  /// @brief Construct a Program by finding it by name.
+  Path FindProgramByName(const std::string& name);
+
+  // These functions change the specified standard stream (stdin, stdout, or
+  // stderr) to binary mode. They return errc::success if the specified stream
+  // was changed. Otherwise a platform dependent error is returned.
+  error_code ChangeStdinToBinary();
+  error_code ChangeStdoutToBinary();
+  error_code ChangeStderrToBinary();
+
+  /// This function executes the program using the arguments provided.  The
+  /// invoked program will inherit the stdin, stdout, and stderr file
+  /// descriptors, the environment and other configuration settings of the
+  /// invoking program.
+  /// This function waits the program to finish.
+  /// @returns an integer result code indicating the status of the program.
+  /// A zero or positive value indicates the result code of the program.
+  /// -1 indicates failure to execute
+  /// -2 indicates a crash during execution or timeout
+  int ExecuteAndWait(
+      const Path &path, ///< sys::Path object providing the path of the
       ///< program to be executed. It is presumed this is the result of
       ///< the FindProgramByName method.
-      const char** args, ///< A vector of strings that are passed to the
+      const char **args, ///< A vector of strings that are passed to the
       ///< program.  The first element should be the name of the program.
       ///< The list *must* be terminated by a null char* entry.
-      const char ** env = 0, ///< An optional vector of strings to use for
+      const char **env = 0, ///< An optional vector of strings to use for
       ///< the program's environment. If not provided, the current program's
       ///< environment will be used.
-      const sys::Path** redirects = 0, ///< An optional array of pointers to
+      const sys::Path **redirects = 0, ///< An optional array of pointers to
       ///< Paths. If the array is null, no redirection is done. The array
       ///< should have a size of at least three. If the pointer in the array
       ///< are not null, then the inferior process's stdin(0), stdout(1),
@@ -72,95 +65,25 @@ namespace sys {
       ///< When an empty Path is passed in, the corresponding file
       ///< descriptor will be disconnected (ie, /dev/null'd) in a portable
       ///< way.
+      unsigned secondsToWait = 0, ///< If non-zero, this specifies the amount
+      ///< of time to wait for the child process to exit. If the time
+      ///< expires, the child is killed and this call returns. If zero,
+      ///< this function will wait until the child finishes or forever if
+      ///< it doesn't.
       unsigned memoryLimit = 0, ///< If non-zero, this specifies max. amount
       ///< of memory can be allocated by process. If memory usage will be
       ///< higher limit, the child is killed and this call returns. If zero
       ///< - no memory limit.
-      std::string* ErrMsg = 0 ///< If non-zero, provides a pointer to a string
+      std::string *ErrMsg = 0, ///< If non-zero, provides a pointer to a string
       ///< instance in which error messages will be returned. If the string
       ///< is non-empty upon return an error occurred while invoking the
       ///< program.
-      );
-
-    /// This function waits for the program to exit. This function will block
-    /// the current program until the invoked program exits.
-    /// @returns an integer result code indicating the status of the program.
-    /// A zero or positive value indicates the result code of the program.
-    /// -1 indicates failure to execute
-    /// -2 indicates a crash during execution or timeout
-    /// @see Execute
-    /// @brief Waits for the program to exit.
-    int Wait
-    ( const Path& path, ///< The path to the child process executable.
-      unsigned secondsToWait, ///< If non-zero, this specifies the amount
-      ///< of time to wait for the child process to exit. If the time
-      ///< expires, the child is killed and this call returns. If zero,
-      ///< this function will wait until the child finishes or forever if
-      ///< it doesn't.
-      std::string* ErrMsg ///< If non-zero, provides a pointer to a string
-      ///< instance in which error messages will be returned. If the string
-      ///< is non-empty upon return an error occurred while waiting.
-      );
-
-  public:
-    /// This static constructor (factory) will attempt to locate a program in
-    /// the operating system's file system using some pre-determined set of
-    /// locations to search (e.g. the PATH on Unix). Paths with slashes are
-    /// returned unmodified.
-    /// @returns A Path object initialized to the path of the program or a
-    /// Path object that is empty (invalid) if the program could not be found.
-    /// @brief Construct a Program by finding it by name.
-    static Path FindProgramByName(const std::string& name);
-
-    // These methods change the specified standard stream (stdin, stdout, or
-    // stderr) to binary mode. They return errc::success if the specified stream
-    // was changed. Otherwise a platform dependent error is returned.
-    static error_code ChangeStdinToBinary();
-    static error_code ChangeStdoutToBinary();
-    static error_code ChangeStderrToBinary();
-
-    /// A convenience function equivalent to Program prg; prg.Execute(..);
-    /// prg.Wait(..);
-    /// @see Execute, Wait
-    static int ExecuteAndWait(const Path& path,
-                              const char** args,
-                              const char ** env = 0,
-                              const sys::Path** redirects = 0,
-                              unsigned secondsToWait = 0,
-                              unsigned memoryLimit = 0,
-                              std::string* ErrMsg = 0,
-                              bool *ExecutionFailed = 0);
-
-    /// A convenience function equivalent to Program prg; prg.Execute(..);
-    /// @see Execute
-    static void ExecuteNoWait(const Path& path,
-                              const char** args,
-                              const char ** env = 0,
-                              const sys::Path** redirects = 0,
-                              unsigned memoryLimit = 0,
-                              std::string* ErrMsg = 0);
-
-    /// @}
-
-  };
-
-  inline int ExecuteAndWait(const Path &path, const char **args,
-                            const char **env = 0,
-                            const sys::Path **redirects = 0,
-                            unsigned secondsToWait = 0,
-                            unsigned memoryLimit = 0, std::string *ErrMsg = 0,
-                            bool *ExecutionFailed = 0) {
-    return Program::ExecuteAndWait(path, args, env, redirects, secondsToWait,
-                                   memoryLimit, ErrMsg, ExecutionFailed);
-  }
-
-  inline Path FindProgramByName(const std::string& name) {
-    return Program::FindProgramByName(name);
-  }
+      bool *ExecutionFailed = 0);
 
-  inline error_code ChangeStdoutToBinary() {
-    return Program::ChangeStdoutToBinary();
-  }
+  /// Similar to ExecuteAndWait, but return immediately.
+  void ExecuteNoWait(const Path &path, const char **args, const char **env = 0,
+                     const sys::Path **redirects = 0, unsigned memoryLimit = 0,
+                     std::string *ErrMsg = 0);
 
   // Return true if the given arguments fit within system-specific
   // argument length limits.
diff --git a/lib/Support/DataStream.cpp b/lib/Support/DataStream.cpp
index 0a02281c25..7815d08092 100644
--- a/lib/Support/DataStream.cpp
+++ b/lib/Support/DataStream.cpp
@@ -66,7 +66,7 @@ public:
   error_code OpenFile(const std::string &Filename) {
     if (Filename == "-") {
       Fd = 0;
-      sys::Program::ChangeStdinToBinary();
+      sys::ChangeStdinToBinary();
       return error_code::success();
     }
   
diff --git a/lib/Support/GraphWriter.cpp b/lib/Support/GraphWriter.cpp
index bff182f30e..41af06c239 100644
--- a/lib/Support/GraphWriter.cpp
+++ b/lib/Support/GraphWriter.cpp
@@ -69,7 +69,7 @@ static bool LLVM_ATTRIBUTE_UNUSED
 ExecGraphViewer(const sys::Path &ExecPath, std::vector<const char*> &args,
                 const sys::Path &Filename, bool wait, std::string &ErrMsg) {
   if (wait) {
-    if (sys::Program::ExecuteAndWait(ExecPath, &args[0],0,0,0,0,&ErrMsg)) {
+    if (sys::ExecuteAndWait(ExecPath, &args[0],0,0,0,0,&ErrMsg)) {
       errs() << "Error: " << ErrMsg << "\n";
       return false;
     }
@@ -77,7 +77,7 @@ ExecGraphViewer(const sys::Path &ExecPath, std::vector<const char*> &args,
     errs() << " done. \n";
   }
   else {
-    sys::Program::ExecuteNoWait(ExecPath, &args[0],0,0,0,&ErrMsg);
+    sys::ExecuteNoWait(ExecPath, &args[0],0,0,0,&ErrMsg);
     errs() << "Remember to erase graph file: " << Filename.str() << "\n";
   }
   return true;
diff --git a/lib/Support/MemoryBuffer.cpp b/lib/Support/MemoryBuffer.cpp
index 82812c0aed..e875d11ec3 100644
--- a/lib/Support/MemoryBuffer.cpp
+++ b/lib/Support/MemoryBuffer.cpp
@@ -419,7 +419,7 @@ error_code MemoryBuffer::getSTDIN(OwningPtr<MemoryBuffer> &result) {
   //
   // FIXME: That isn't necessarily true, we should try to mmap stdin and
   // fallback if it fails.
-  sys::Program::ChangeStdinToBinary();
+  sys::ChangeStdinToBinary();
 
   return getMemoryBufferForStream(0, "<stdin>", result);
 }
diff --git a/lib/Support/Program.cpp b/lib/Support/Program.cpp
index 201d5c0d30..ae7e291e2a 100644
--- a/lib/Support/Program.cpp
+++ b/lib/Support/Program.cpp
@@ -22,33 +22,31 @@ using namespace sys;
 //===          independent code.
 //===----------------------------------------------------------------------===//
 
-int
-Program::ExecuteAndWait(const Path& path,
-                        const char** args,
-                        const char** envp,
-                        const Path** redirects,
-                        unsigned secondsToWait,
-                        unsigned memoryLimit,
-                        std::string* ErrMsg,
+static bool Execute(void *&Data, const Path &path, const char **args,
+                    const char **env, const sys::Path **redirects,
+                    unsigned memoryLimit, std::string *ErrMsg);
+
+static int Wait(void *&Data, const Path &path, unsigned secondsToWait,
+                std::string *ErrMsg);
+
+int sys::ExecuteAndWait(const Path &path, const char **args, const char **envp,
+                        const Path **redirects, unsigned secondsToWait,
+                        unsigned memoryLimit, std::string *ErrMsg,
                         bool *ExecutionFailed) {
-  Program prg;
-  if (prg.Execute(path, args, envp, redirects, memoryLimit, ErrMsg)) {
+  void *Data;
+  if (Execute(Data, path, args, envp, redirects, memoryLimit, ErrMsg)) {
     if (ExecutionFailed) *ExecutionFailed = false;
-    return prg.Wait(path, secondsToWait, ErrMsg);
+    return Wait(Data, path, secondsToWait, ErrMsg);
   }
   if (ExecutionFailed) *ExecutionFailed = true;
   return -1;
 }
 
-void
-Program::ExecuteNoWait(const Path& path,
-                       const char** args,
-                       const char** envp,
-                       const Path** redirects,
-                       unsigned memoryLimit,
-                       std::string* ErrMsg) {
-  Program prg;
-  prg.Execute(path, args, envp, redirects, memoryLimit, ErrMsg);
+void sys::ExecuteNoWait(const Path &path, const char **args, const char **envp,
+                        const Path **redirects, unsigned memoryLimit,
+                        std::string *ErrMsg) {
+  void *Data;
+  Execute(Data, path, args, envp, redirects, memoryLimit, ErrMsg);
 }
 
 // Include the platform-specific parts of this class.
diff --git a/lib/Support/Unix/Program.inc b/lib/Support/Unix/Program.inc
index aa03d48438..0d6543a8a8 100644
--- a/lib/Support/Unix/Program.inc
+++ b/lib/Support/Unix/Program.inc
@@ -47,13 +47,9 @@
 namespace llvm {
 using namespace sys;
 
-Program::Program() : Data_(0) {}
-
-Program::~Program() {}
-
 // This function just uses the PATH environment variable to find the program.
 Path
-Program::FindProgramByName(const std::string& progName) {
+sys::FindProgramByName(const std::string& progName) {
 
   // Check some degenerate cases
   if (progName.length() == 0) // no program
@@ -180,10 +176,11 @@ static void SetMemoryLimits (unsigned size)
 #endif
 }
 
-bool
-Program::Execute(const Path &path, const char **args, const char **envp,
-                 const Path **redirects, unsigned memoryLimit,
-                  std::string *ErrMsg) {
+}
+
+static bool Execute(void *&Data, const Path &path, const char **args,
+                    const char **envp, const Path **redirects,
+                    unsigned memoryLimit, std::string *ErrMsg) {
   // If this OS has posix_spawn and there is no memory limit being implied, use
   // posix_spawn.  It is more efficient than fork/exec.
 #ifdef HAVE_POSIX_SPAWN
@@ -231,7 +228,7 @@ Program::Execute(const Path &path, const char **args, const char **envp,
     if (Err)
      return !MakeErrMsg(ErrMsg, "posix_spawn failed", Err);
 
-    Data_ = reinterpret_cast<void*>(PID);
+    Data = reinterpret_cast<void*>(PID);
     return true;
   }
 #endif
@@ -293,20 +290,17 @@ Program::Execute(const Path &path, const char **args, const char **envp,
       break;
   }
 
-  Data_ = reinterpret_cast<void*>(child);
+  Data = reinterpret_cast<void*>(child);
 
   return true;
 }
 
-int
-Program::Wait(const sys::Path &path,
-              unsigned secondsToWait,
-              std::string* ErrMsg)
-{
+static int Wait(void *&Data, const sys::Path &path, unsigned secondsToWait,
+                std::string *ErrMsg) {
 #ifdef HAVE_SYS_WAIT_H
   struct sigaction Act, Old;
 
-  if (Data_ == 0) {
+  if (Data == 0) {
     MakeErrMsg(ErrMsg, "Process not started!");
     return -1;
   }
@@ -324,7 +318,7 @@ Program::Wait(const sys::Path &path,
 
   // Parent process: Wait for the child process to terminate.
   int status;
-  uint64_t pid = reinterpret_cast<uint64_t>(Data_);
+  uint64_t pid = reinterpret_cast<uint64_t>(Data);
   pid_t child = static_cast<pid_t>(pid);
   while (waitpid(pid, &status, 0) != child)
     if (secondsToWait && errno == EINTR) {
@@ -397,17 +391,19 @@ Program::Wait(const sys::Path &path,
 #endif
 }
 
-error_code Program::ChangeStdinToBinary(){
+namespace llvm {
+
+error_code sys::ChangeStdinToBinary(){
   // Do nothing, as Unix doesn't differentiate between text and binary.
   return make_error_code(errc::success);
 }
 
-error_code Program::ChangeStdoutToBinary(){
+error_code sys::ChangeStdoutToBinary(){
   // Do nothing, as Unix doesn't differentiate between text and binary.
   return make_error_code(errc::success);
 }
 
-error_code Program::ChangeStderrToBinary(){
+error_code sys::ChangeStderrToBinary(){
   // Do nothing, as Unix doesn't differentiate between text and binary.
   return make_error_code(errc::success);
 }
diff --git a/lib/Support/raw_ostream.cpp b/lib/Support/raw_ostream.cpp
index a433088b19..9262945358 100644
--- a/lib/Support/raw_ostream.cpp
+++ b/lib/Support/raw_ostream.cpp
@@ -442,7 +442,7 @@ raw_fd_ostream::raw_fd_ostream(const char *Filename, std::string &ErrorInfo,
     // If user requested binary then put stdout into binary mode if
     // possible.
     if (Flags & F_Binary)
-      sys::Program::ChangeStdoutToBinary();
+      sys::ChangeStdoutToBinary();
     // Close stdout when we're done, to detect any output errors.
     ShouldClose = true;
     return;
diff --git a/tools/bugpoint/OptimizerDriver.cpp b/tools/bugpoint/OptimizerDriver.cpp
index 87dc9f332c..6c491ff0f9 100644
--- a/tools/bugpoint/OptimizerDriver.cpp
+++ b/tools/bugpoint/OptimizerDriver.cpp
@@ -148,7 +148,7 @@ bool BugDriver::runPasses(Module *Program,
     return 1;
   }
 
-  sys::Path tool = sys::Program::FindProgramByName("opt");
+  sys::Path tool = sys::FindProgramByName("opt");
   if (tool.empty()) {
     errs() << "Cannot find `opt' in PATH!\n";
     return 1;
@@ -196,7 +196,7 @@ bool BugDriver::runPasses(Module *Program,
 
   sys::Path prog;
   if (UseValgrind)
-    prog = sys::Program::FindProgramByName("valgrind");
+    prog = sys::FindProgramByName("valgrind");
   else
     prog = tool;
 
@@ -204,9 +204,9 @@ bool BugDriver::runPasses(Module *Program,
   sys::Path Nowhere;
   const sys::Path *Redirects[3] = {0, &Nowhere, &Nowhere};
 
-  int result = sys::Program::ExecuteAndWait(prog, Args.data(), 0,
-                                            (SilencePasses ? Redirects : 0),
-                                            Timeout, MemoryLimit, &ErrMsg);
+  int result =
+      sys::ExecuteAndWait(prog, Args.data(), 0, (SilencePasses ? Redirects : 0),
+                          Timeout, MemoryLimit, &ErrMsg);
 
   // If we are supposed to delete the bitcode file or if the passes crashed,
   // remove it now.  This may fail if the file was never created, but that's ok.
diff --git a/tools/bugpoint/ToolRunner.cpp b/tools/bugpoint/ToolRunner.cpp
index 735061d8bc..54a48111f8 100644
--- a/tools/bugpoint/ToolRunner.cpp
+++ b/tools/bugpoint/ToolRunner.cpp
@@ -75,9 +75,8 @@ static int RunProgramWithTimeout(const sys::Path &ProgramPath,
   }
 #endif
 
-  return
-    sys::Program::ExecuteAndWait(ProgramPath, Args, 0, redirects,
-                                 NumSeconds, MemoryLimit, ErrMsg);
+  return sys::ExecuteAndWait(ProgramPath, Args, 0, redirects, NumSeconds,
+                             MemoryLimit, ErrMsg);
 }
 
 /// RunProgramRemotelyWithTimeout - This function runs the given program
@@ -108,8 +107,8 @@ static int RunProgramRemotelyWithTimeout(const sys::Path &RemoteClientPath,
 #endif
 
   // Run the program remotely with the remote client
-  int ReturnCode = sys::Program::ExecuteAndWait(RemoteClientPath, Args,
-                                 0, redirects, NumSeconds, MemoryLimit);
+  int ReturnCode = sys::ExecuteAndWait(RemoteClientPath, Args, 0, redirects,
+                                       NumSeconds, MemoryLimit);
 
   // Has the remote client fail?
   if (255 == ReturnCode) {
@@ -398,7 +397,7 @@ static void lexCommand(std::string &Message, const std::string &CommandLine,
     pos = CommandLine.find_first_of(delimiters, lastPos);
   }
 
-  CmdPath = sys::Program::FindProgramByName(Command).str();
+  CmdPath = sys::FindProgramByName(Command).str();
   if (CmdPath.empty()) {
     Message =
       std::string("Cannot find '") + Command +
@@ -875,7 +874,7 @@ int GCC::MakeSharedObject(const std::string &InputFile, FileType fileType,
 GCC *GCC::create(std::string &Message,
                  const std::string &GCCBinary,
                  const std::vector<std::string> *Args) {
-  sys::Path GCCPath = sys::Program::FindProgramByName(GCCBinary);
+  sys::Path GCCPath = sys::FindProgramByName(GCCBinary);
   if (GCCPath.isEmpty()) {
     Message = "Cannot find `"+ GCCBinary +"' in PATH!\n";
     return 0;
@@ -883,7 +882,7 @@ GCC *GCC::create(std::string &Message,
 
   sys::Path RemoteClientPath;
   if (!RemoteClient.empty())
-    RemoteClientPath = sys::Program::FindProgramByName(RemoteClient);
+    RemoteClientPath = sys::FindProgramByName(RemoteClient);
 
   Message = "Found gcc: " + GCCPath.str() + "\n";
   return new GCC(GCCPath, RemoteClientPath, Args);
diff --git a/tools/llvm-nm/llvm-nm.cpp b/tools/llvm-nm/llvm-nm.cpp
index a24aae6061..683f99d342 100644
--- a/tools/llvm-nm/llvm-nm.cpp
+++ b/tools/llvm-nm/llvm-nm.cpp
@@ -425,7 +425,7 @@ int main(int argc, char **argv) {
   cl::ParseCommandLineOptions(argc, argv, "llvm symbol table dumper\n");
 
   // llvm-nm only reads binary files.
-  if (error(sys::Program::ChangeStdinToBinary()))
+  if (error(sys::ChangeStdinToBinary()))
     return 1;
 
   ToolName = argv[0];
diff --git a/unittests/Support/ProgramTest.cpp b/unittests/Support/ProgramTest.cpp
index 6cbb05454f..f132c03304 100644
--- a/unittests/Support/ProgramTest.cpp
+++ b/unittests/Support/ProgramTest.cpp
@@ -79,9 +79,9 @@ TEST(ProgramTest, CreateProcessTrailingSlash) {
   Path nul("/dev/null");
 #endif
   const Path *redirects[] = { &nul, &nul, 0 };
-  int rc = Program::ExecuteAndWait(my_exe, argv, &envp[0], redirects,
-                                   /*secondsToWait=*/10, /*memoryLimit=*/0,
-                                   &error, &ExecutionFailed);
+  int rc =
+      ExecuteAndWait(my_exe, argv, &envp[0], redirects, /*secondsToWait=*/ 10,
+                     /*memoryLimit=*/ 0, &error, &ExecutionFailed);
   EXPECT_FALSE(ExecutionFailed) << error;
   EXPECT_EQ(0, rc);
 }
diff --git a/utils/not/not.cpp b/utils/not/not.cpp
index 9a924b56a7..bb2d87bb44 100644
--- a/utils/not/not.cpp
+++ b/utils/not/not.cpp
@@ -13,11 +13,10 @@
 using namespace llvm;
 
 int main(int argc, const char **argv) {
-  sys::Path Program = sys::Program::FindProgramByName(argv[1]);
+  sys::Path Program = sys::FindProgramByName(argv[1]);
 
   std::string ErrMsg;
-  int Result = sys::Program::ExecuteAndWait(Program, argv + 1, 0, 0, 0, 0,
-                                            &ErrMsg);
+  int Result = sys::ExecuteAndWait(Program, argv + 1, 0, 0, 0, 0, &ErrMsg);
   if (Result < 0) {
     errs() << "Error: " << ErrMsg << "\n";
     return 1;