Improve sys::Path::makeAbsolute on Win32.

- Patch by Viktor Kutuzov!

 - Minor tweak by me to add llvm_unreachable calls on FIXMEd error paths.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75424 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Support/SystemUtils.cpp

@@ -51,7 +51,7 @@ sys::Path llvm::FindExecutable(const std::string &ExeName,
 
   // Otherwise check the directory that the calling program is in.  We can do
   // this if ProgramPath contains at least one / character, indicating that it
-  // is a relative path to bugpoint itself.
+  // is a relative path to the executable itself.
   Result = ProgramPath;
   Result.eraseComponent();
   if (!Result.isEmpty()) {

lib/System/Path.cpp

@@ -13,6 +13,7 @@
 
 #include "llvm/System/Path.h"
 #include "llvm/Config/config.h"
+#include "llvm/Support/ErrorHandling.h"
 #include <cassert>
 #include <cstring>
 #include <ostream>
@@ -207,18 +208,6 @@ bool Path::hasMagicNumber(const std::string &Magic) const {
   return false;
 }
 
-void Path::makeAbsolute() {
-  if (isAbsolute())
-    return;
-
-  Path CWD = Path::GetCurrentDirectory();
-  assert(CWD.isAbsolute() && "GetCurrentDirectory returned relative path!");
-
-  CWD.appendComponent(path);
-
-  path = CWD.toString();
-}
-
 static void getPathList(const char*path, std::vector<Path>& Paths) {
   const char* at = path;
   const char* delim = strchr(at, PathSeparator);

lib/System/Unix/Path.inc

@@ -109,6 +109,19 @@ Path::isAbsolute() const {
     return false;
   return path[0] == '/';
 }
+
+void Path::makeAbsolute() {
+  if (isAbsolute())
+    return;
+
+  Path CWD = Path::GetCurrentDirectory();
+  assert(CWD.isAbsolute() && "GetCurrentDirectory returned relative path!");
+
+  CWD.appendComponent(path);
+
+  path = CWD.toString();
+}
+
 Path
 Path::GetRootDirectory() {
   Path result;

lib/System/Win32/Path.inc

@@ -125,9 +125,30 @@ Path::isValid() const {
   return true;
 }
 
+void Path::makeAbsolute() {
+  TCHAR  FullPath[MAX_PATH + 1] = {0}; 
+  LPTSTR FilePart = NULL;
+
+  DWORD RetLength = ::GetFullPathNameA(path.c_str(),
+                        sizeof(FullPath)/sizeof(FullPath[0]),
+                        FullPath, &FilePart);
+
+  if (0 == RetLength) {
+    // FIXME: Report the error GetLastError()
+    llvm_unreachable("Unable to make absolute path!");
+  } else if (RetLength > MAX_PATH) {
+    // FIXME: Report too small buffer (needed RetLength bytes).
+    llvm_unreachable("Unable to make absolute path!");
+  } else {
+    path = FullPath;
+  }
+}
+
 bool
 Path::isAbsolute(const char *NameStart, unsigned NameLen) {
   assert(NameStart);
+  // FIXME: This does not handle correctly an absolute path starting from
+  // a drive letter or in UNC format.
   switch (NameLen) {
   case 0:
     return false;
@@ -141,6 +162,8 @@ Path::isAbsolute(const char *NameStart, unsigned NameLen) {
 
 bool 
 Path::isAbsolute() const {
+  // FIXME: This does not handle correctly an absolute path starting from
+  // a drive letter or in UNC format.
   switch (path.length()) {
     case 0:
       return false;