Rename sys::Process::GetArgumentVector -> sys::windows::GetCommandLineArguments

GetArgumentVector (or GetCommandLineArguments) is very Windows-specific.
I think it doesn't make much sense to provide that function from sys::Process.

I also made a change so that the function takes a BumpPtrAllocator
instead of a SpecificBumpPtrAllocator. The latter is the class to call
dtors, but since char * is trivially destructible, we should use the
former class.

Differential Revision: https://reviews.llvm.org/D45641

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@330216 91177308-0d34-0410-b5e6-96231b3b80d8

6 files changed, 40 insertions, 49 deletions

diff --git a/include/llvm/Support/InitLLVM.h b/include/llvm/Support/InitLLVM.h
index 9cfa49306a8..0f629c9ac92 100644
--- a/include/llvm/Support/InitLLVM.h
+++ b/include/llvm/Support/InitLLVM.h
@@ -37,7 +37,7 @@ public:
   ~InitLLVM();
 
 private:
-  SpecificBumpPtrAllocator<char> Alloc;
+  BumpPtrAllocator Alloc;
   SmallVector<const char *, 0> Args;
   PrettyStackTraceProgram StackPrinter;
 };
diff --git a/include/llvm/Support/Process.h b/include/llvm/Support/Process.h
index 82b0d9f6ba2..b5a915c661d 100644
--- a/include/llvm/Support/Process.h
+++ b/include/llvm/Support/Process.h
@@ -90,14 +90,6 @@ public:
   static Optional<std::string> FindInEnvPath(StringRef EnvName,
                                              StringRef FileName);
 
-  /// This function returns a SmallVector containing the arguments passed from
-  /// the operating system to the program.  This function expects to be handed
-  /// the vector passed in from main.
-  static std::error_code
-  GetArgumentVector(SmallVectorImpl<const char *> &Args,
-                    ArrayRef<const char *> ArgsFromMain,
-                    SpecificBumpPtrAllocator<char> &ArgAllocator);
-
   // This functions ensures that the standard file descriptors (input, output,
   // and error) are properly mapped to a file descriptor before we use any of
   // them.  This should only be called by standalone programs, library
diff --git a/lib/Support/InitLLVM.cpp b/lib/Support/InitLLVM.cpp
index c76b1bd8d9f..c008d0455c9 100644
--- a/lib/Support/InitLLVM.cpp
+++ b/lib/Support/InitLLVM.cpp
@@ -15,7 +15,12 @@
 #include "llvm/Support/Signals.h"
 #include <string>
 
+#ifdef _WIN32
+#include "Windows/WindowsSupport.h"
+#endif
+
 using namespace llvm;
+using namespace llvm::sys;
 
 InitLLVM::InitLLVM(int &Argc, const char **&Argv) : StackPrinter(Argc, Argv) {
   sys::PrintStackTraceOnErrorSignal(Argv[0]);
@@ -33,11 +38,10 @@ InitLLVM::InitLLVM(int &Argc, const char **&Argv) : StackPrinter(Argc, Argv) {
   std::string Banner = std::string(Argv[0]) + ": ";
   ExitOnError ExitOnErr(Banner);
 
-  ExitOnErr(errorCodeToError(
-      sys::Process::GetArgumentVector(Args, makeArrayRef(Argv, Argc), Alloc)));
+  ExitOnErr(errorCodeToError(windows::GetCommandLineArguments(Args, Alloc)));
 
-  // GetArgumentVector doesn't terminate the vector with a nullptr.
-  // Do it to make it compatible with the real argv.
+  // GetCommandLineArguments doesn't terminate the vector with a
+  // nullptr.  Do it to make it compatible with the real argv.
   Args.push_back(nullptr);
 
   Argc = Args.size() - 1;
diff --git a/lib/Support/Unix/Process.inc b/lib/Support/Unix/Process.inc
index 7a4e3861400..3ce2212c6e7 100644
--- a/lib/Support/Unix/Process.inc
+++ b/lib/Support/Unix/Process.inc
@@ -172,15 +172,6 @@ Optional<std::string> Process::GetEnv(StringRef Name) {
   return std::string(Val);
 }
 
-std::error_code
-Process::GetArgumentVector(SmallVectorImpl<const char *> &ArgsOut,
-                           ArrayRef<const char *> ArgsIn,
-                           SpecificBumpPtrAllocator<char> &) {
-  ArgsOut.append(ArgsIn.begin(), ArgsIn.end());
-
-  return std::error_code();
-}
-
 namespace {
 class FDCloser {
 public:
diff --git a/lib/Support/Windows/Process.inc b/lib/Support/Windows/Process.inc
index 06b32ea90a5..2e9b1c7d051 100644
--- a/lib/Support/Windows/Process.inc
+++ b/lib/Support/Windows/Process.inc
@@ -139,39 +139,38 @@ Optional<std::string> Process::GetEnv(StringRef Name) {
   return std::string(Res.data());
 }
 
-static void AllocateAndPush(const SmallVectorImpl<char> &S,
-                            SmallVectorImpl<const char *> &Vector,
-                            SpecificBumpPtrAllocator<char> &Allocator) {
-  char *Buffer = Allocator.Allocate(S.size() + 1);
-  ::memcpy(Buffer, S.data(), S.size());
-  Buffer[S.size()] = '\0';
-  Vector.push_back(Buffer);
+static const char *AllocateString(const SmallVectorImpl<char> &S,
+                                  BumpPtrAllocator &Alloc) {
+  char *Buf = reinterpret_cast<char *>(Alloc.Allocate(S.size() + 1, 1));
+  ::memcpy(Buf, S.data(), S.size());
+  Buf[S.size()] = '\0';
+  return Buf;
 }
 
 /// Convert Arg from UTF-16 to UTF-8 and push it onto Args.
-static std::error_code
-ConvertAndPushArg(const wchar_t *Arg, SmallVectorImpl<const char *> &Args,
-                  SpecificBumpPtrAllocator<char> &Allocator) {
+static std::error_code ConvertAndPushArg(const wchar_t *Arg,
+                                         SmallVectorImpl<const char *> &Args,
+                                         BumpPtrAllocator &Alloc) {
   SmallVector<char, MAX_PATH> ArgString;
   if (std::error_code ec = windows::UTF16ToUTF8(Arg, wcslen(Arg), ArgString))
     return ec;
-  AllocateAndPush(ArgString, Args, Allocator);
+  Args.push_back(AllocateString(ArgString, Alloc));
   return std::error_code();
 }
 
 /// \brief Perform wildcard expansion of Arg, or just push it into Args if it
 /// doesn't have wildcards or doesn't match any files.
-static std::error_code
-WildcardExpand(const wchar_t *Arg, SmallVectorImpl<const char *> &Args,
-               SpecificBumpPtrAllocator<char> &Allocator) {
+static std::error_code WildcardExpand(const wchar_t *Arg,
+                                      SmallVectorImpl<const char *> &Args,
+                                      BumpPtrAllocator &Alloc) {
   if (!wcspbrk(Arg, L"*?")) {
     // Arg does not contain any wildcard characters. This is the common case.
-    return ConvertAndPushArg(Arg, Args, Allocator);
+    return ConvertAndPushArg(Arg, Args, Alloc);
   }
 
   if (wcscmp(Arg, L"/?") == 0 || wcscmp(Arg, L"-?") == 0) {
     // Don't wildcard expand /?. Always treat it as an option.
-    return ConvertAndPushArg(Arg, Args, Allocator);
+    return ConvertAndPushArg(Arg, Args, Alloc);
   }
 
   // Extract any directory part of the argument.
@@ -188,7 +187,7 @@ WildcardExpand(const wchar_t *Arg, SmallVectorImpl<const char *> &Args,
   WIN32_FIND_DATAW FileData;
   HANDLE FindHandle = FindFirstFileW(Arg, &FileData);
   if (FindHandle == INVALID_HANDLE_VALUE) {
-    return ConvertAndPushArg(Arg, Args, Allocator);
+    return ConvertAndPushArg(Arg, Args, Alloc);
   }
 
   std::error_code ec;
@@ -201,7 +200,7 @@ WildcardExpand(const wchar_t *Arg, SmallVectorImpl<const char *> &Args,
 
     // Append FileName to Dir, and remove it afterwards.
     llvm::sys::path::append(Dir, StringRef(FileName.data(), FileName.size()));
-    AllocateAndPush(Dir, Args, Allocator);
+    Args.push_back(AllocateString(Dir, Alloc));
     Dir.resize(DirSize);
   } while (FindNextFileW(FindHandle, &FileData));
 
@@ -209,9 +208,9 @@ WildcardExpand(const wchar_t *Arg, SmallVectorImpl<const char *> &Args,
   return ec;
 }
 
-static std::error_code
-ExpandShortFileName(const wchar_t *Arg, SmallVectorImpl<const char *> &Args,
-                    SpecificBumpPtrAllocator<char> &Allocator) {
+static std::error_code ExpandShortFileName(const wchar_t *Arg,
+                                           SmallVectorImpl<const char *> &Args,
+                                           BumpPtrAllocator &Alloc) {
   SmallVector<wchar_t, MAX_PATH> LongPath;
   DWORD Length = GetLongPathNameW(Arg, LongPath.data(), LongPath.capacity());
   if (Length == 0)
@@ -223,13 +222,12 @@ ExpandShortFileName(const wchar_t *Arg, SmallVectorImpl<const char *> &Args,
     return mapWindowsError(ERROR_INSUFFICIENT_BUFFER);
   }
   LongPath.set_size(Length);
-  return ConvertAndPushArg(LongPath.data(), Args, Allocator);
+  return ConvertAndPushArg(LongPath.data(), Args, Alloc);
 }
 
 std::error_code
-Process::GetArgumentVector(SmallVectorImpl<const char *> &Args,
-                           ArrayRef<const char *>,
-                           SpecificBumpPtrAllocator<char> &ArgAllocator) {
+windows::GetCommandLineArguments(SmallVectorImpl<const char *> &Args,
+                                 BumpPtrAllocator &Alloc) {
   int ArgCount;
   wchar_t **UnicodeCommandLine =
       CommandLineToArgvW(GetCommandLineW(), &ArgCount);
@@ -249,10 +247,10 @@ Process::GetArgumentVector(SmallVectorImpl<const char *> &Args,
   // If the first argument is a shortened (8.3) name (which is possible even
   // if we got the module name), the driver will have trouble distinguishing it
   // (e.g., clang.exe v. clang++.exe), so expand it now.
-  ec = ExpandShortFileName(UnicodeCommandLine[0], Args, ArgAllocator);
+  ec = ExpandShortFileName(UnicodeCommandLine[0], Args, Alloc);
 
   for (int i = 1; i < ArgCount && !ec; ++i) {
-    ec = WildcardExpand(UnicodeCommandLine[i], Args, ArgAllocator);
+    ec = WildcardExpand(UnicodeCommandLine[i], Args, Alloc);
     if (ec)
       break;
   }
diff --git a/lib/Support/Windows/WindowsSupport.h b/lib/Support/Windows/WindowsSupport.h
index 3ea2fa36265..7b741ace85d 100644
--- a/lib/Support/Windows/WindowsSupport.h
+++ b/lib/Support/Windows/WindowsSupport.h
@@ -261,6 +261,12 @@ std::error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len,
 /// Convert from UTF16 to the current code page used in the system
 std::error_code UTF16ToCurCP(const wchar_t *utf16, size_t utf16_len,
                              SmallVectorImpl<char> &utf8);
+
+// Returns command line arguments. Unlike arguments given to main(),
+// this function guarantees that the returned arguments are encoded in
+// UTF-8 regardless of the current code page setting.
+std::error_code GetCommandLineArguments(SmallVectorImpl<const char *> &Args,
+                                        BumpPtrAllocator &Alloc);
 } // end namespace windows
 } // end namespace sys
 } // end namespace llvm.