[NFC] Darwin llgs support from Week of Code

This code represents the Week of Code work I did on bringing up
lldb-server LLGS support for Darwin.  It does not include the
Xcode project changes needed, as we don't want to throw that switch
until more support is implemented (i.e. this change is inert, no
build systems use it yet.  I've verified on Ubuntu 16.04, macOS
Xcode and macOS cmake builds).

This change does some minimal refactoring of code that is shared
with the Linux LLGS portion, moving it from NativeProcessLinux into
NativeProcessProtocol.  That code is also used by NativeProcessDarwin.

Current state on Darwin:
* Process launching is implemented.  (Attach is not).
  Launching on devices has not yet been tested (FBS/BKS might
  need a bit of work).
* Inferior waitpid monitoring and communication of exit status
  via MainLoop callback is implemented.
* Memory read/write, breakpoints, thread register context, etc.
  are not yet implemented.  This impacts process stop/resume, as
  the initial launch suspended immediately starts the process
  up and running because it doesn't know it is supposed to remain
  stopped.
* I implemented the equivalent of MachThreadList as
  NativeThreadListDarwin, in anticipation that we might want to
  factor out common parts into NativeThreadList{Protocol} and share
  some code here.  After writing it, though, the fallout from merging
  Mach Task/Process into a single concept plus some other minor
  changes makes the whole NativeThreadListDarwin concept nothing more
  than dead weight.  I am likely going to get rid of this class and
  just manage it directly in NativeProcessDarwin, much like I did
  for NativeProcessLinux.
* There is a stub-out call for starting a STDIO thread.  That will
  go away and adopt the MainLoop pselect-based IOObject reading.

I am developing the fully-integrated changes in the following repo,
which contains the necessary Xcode bits and the glue that enables
lldb-debugserver on a macOS system:

  https://github.com/tfiala/lldb/tree/llgs-darwin

This change also breaks out a few of the lldb-server tests into
their own directory, and adds some $qHostInfo tests (not sure why
I didn't write those tests back when I initially implemented that
on the Linux side).

llvm-svn: 280604

1 files changed, 201 insertions, 0 deletions

diff --git a/lldb/source/Plugins/Process/Darwin/CFString.cpp b/lldb/source/Plugins/Process/Darwin/CFString.cpp
new file mode 100644
index 0000000..819024c
--- /dev/null
+++ b/lldb/source/Plugins/Process/Darwin/CFString.cpp
@@ -0,0 +1,201 @@
+//===-- CFString.cpp --------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  Created by Greg Clayton on 1/16/08.
+//
+//===----------------------------------------------------------------------===//
+
+#include "CFString.h"
+#include <string>
+#include <glob.h>
+
+//----------------------------------------------------------------------
+// CFString constructor
+//----------------------------------------------------------------------
+CFString::CFString(CFStringRef s) :
+    CFReleaser<CFStringRef> (s)
+{
+}
+
+//----------------------------------------------------------------------
+// CFString copy constructor
+//----------------------------------------------------------------------
+CFString::CFString(const CFString& rhs) :
+    CFReleaser<CFStringRef> (rhs)
+{
+
+}
+
+//----------------------------------------------------------------------
+// CFString copy constructor
+//----------------------------------------------------------------------
+CFString&
+CFString::operator=(const CFString& rhs)
+{
+    if (this != &rhs)
+        *this = rhs;
+    return *this;
+}
+
+CFString::CFString (const char *cstr, CFStringEncoding cstr_encoding) :
+    CFReleaser<CFStringRef> ()
+{
+    if (cstr && cstr[0])
+    {
+        reset(::CFStringCreateWithCString(kCFAllocatorDefault, cstr, cstr_encoding));
+    }
+}
+
+//----------------------------------------------------------------------
+// Destructor
+//----------------------------------------------------------------------
+CFString::~CFString()
+{
+}
+
+const char *
+CFString::GetFileSystemRepresentation(std::string& s)
+{
+    return CFString::FileSystemRepresentation(get(), s);
+}
+
+CFStringRef
+CFString::SetFileSystemRepresentation (const char *path)
+{
+    CFStringRef new_value = NULL;
+    if (path && path[0])
+        new_value = ::CFStringCreateWithFileSystemRepresentation (kCFAllocatorDefault, path);
+    reset(new_value);
+    return get();
+}
+
+
+CFStringRef
+CFString::SetFileSystemRepresentationFromCFType (CFTypeRef cf_type)
+{
+    CFStringRef new_value = NULL;
+    if (cf_type != NULL)
+    {
+        CFTypeID cf_type_id = ::CFGetTypeID(cf_type);
+
+        if (cf_type_id == ::CFStringGetTypeID())
+        {
+            // Retain since we are using the existing object
+            new_value = (CFStringRef)::CFRetain(cf_type);
+        }
+        else if (cf_type_id == ::CFURLGetTypeID())
+        {
+            new_value = ::CFURLCopyFileSystemPath((CFURLRef)cf_type, kCFURLPOSIXPathStyle);
+        }
+    }
+    reset(new_value);
+    return get();
+}
+
+CFStringRef
+CFString::SetFileSystemRepresentationAndExpandTilde (const char *path)
+{
+    std::string expanded_path;
+    if (CFString::GlobPath(path, expanded_path))
+        SetFileSystemRepresentation(expanded_path.c_str());
+    else
+        reset();
+    return get();
+}
+
+const char *
+CFString::UTF8(std::string& str)
+{
+    return CFString::UTF8(get(), str);
+}
+
+// Static function that puts a copy of the UTF8 contents of CF_STR into STR
+// and returns the C string pointer that is contained in STR when successful, else
+// NULL is returned. This allows the std::string parameter to own the extracted string,
+// and also allows that string to be returned as a C string pointer that can be used.
+
+const char *
+CFString::UTF8 (CFStringRef cf_str, std::string& str)
+{
+    if (cf_str)
+    {
+        const CFStringEncoding encoding = kCFStringEncodingUTF8;
+        CFIndex max_utf8_str_len = CFStringGetLength (cf_str);
+        max_utf8_str_len = CFStringGetMaximumSizeForEncoding (max_utf8_str_len, encoding);
+        if (max_utf8_str_len > 0)
+        {
+            str.resize(max_utf8_str_len);
+            if (!str.empty())
+            {
+                if (CFStringGetCString (cf_str, &str[0], str.size(), encoding))
+                {
+                    str.resize(strlen(str.c_str()));
+                    return str.c_str();
+                }
+            }
+        }
+    }
+    return NULL;
+}
+
+// Static function that puts a copy of the file system representation of CF_STR
+// into STR and returns the C string pointer that is contained in STR when
+// successful, else NULL is returned. This allows the std::string parameter
+// to own the extracted string, and also allows that string to be returned as
+// a C string pointer that can be used.
+
+const char *
+CFString::FileSystemRepresentation (CFStringRef cf_str, std::string& str)
+{
+    if (cf_str)
+    {
+        CFIndex max_length = ::CFStringGetMaximumSizeOfFileSystemRepresentation (cf_str);
+        if (max_length > 0)
+        {
+            str.resize(max_length);
+            if (!str.empty())
+            {
+                if (::CFStringGetFileSystemRepresentation (cf_str, &str[0], str.size()))
+                {
+                    str.erase(::strlen(str.c_str()));
+                    return str.c_str();
+                }
+            }
+        }
+    }
+    str.erase();
+    return NULL;
+}
+
+
+CFIndex
+CFString::GetLength() const
+{
+    CFStringRef str = get();
+    if (str)
+        return CFStringGetLength (str);
+    return 0;
+}
+
+
+const char*
+CFString::GlobPath(const char* path, std::string &expanded_path)
+{
+    glob_t globbuf;
+    if (::glob (path, GLOB_TILDE, NULL, &globbuf) == 0)
+    {
+        expanded_path = globbuf.gl_pathv[0];
+        ::globfree (&globbuf);
+    }
+    else
+        expanded_path.clear();
+
+    return expanded_path.c_str();
+}
+