llvm-project/lldb/source/Target/Target.cpp

//===-- Target.cpp ----------------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "lldb/lldb-python.h"

#include "lldb/Target/Target.h"

// C Includes
// C++ Includes
// Other libraries and framework includes
// Project includes
#include "lldb/Breakpoint/BreakpointResolver.h"
#include "lldb/Breakpoint/BreakpointResolverAddress.h"
#include "lldb/Breakpoint/BreakpointResolverFileLine.h"
#include "lldb/Breakpoint/BreakpointResolverFileRegex.h"
#include "lldb/Breakpoint/BreakpointResolverName.h"
#include "lldb/Breakpoint/Watchpoint.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/Event.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/Section.h"
#include "lldb/Core/StreamString.h"
#include "lldb/Core/Timer.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/Expression/ClangASTSource.h"
#include "lldb/Expression/ClangUserExpression.h"
#include "lldb/Host/Host.h"
#include "lldb/Interpreter/CommandInterpreter.h"
#include "lldb/Interpreter/CommandReturnObject.h"
#include "lldb/Interpreter/OptionGroupWatchpoint.h"
#include "lldb/Interpreter/OptionValues.h"
#include "lldb/Interpreter/Property.h"
#include "lldb/lldb-private-log.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/StackFrame.h"
#include "lldb/Target/Thread.h"
#include "lldb/Target/ThreadSpec.h"

using namespace lldb;
using namespace lldb_private;

ConstString &
Target::GetStaticBroadcasterClass ()
{
    static ConstString class_name ("lldb.target");
    return class_name;
}

//----------------------------------------------------------------------
// Target constructor
//----------------------------------------------------------------------
Target::Target(Debugger &debugger, const ArchSpec &target_arch, const lldb::PlatformSP &platform_sp) :
    TargetProperties (this),
    Broadcaster (&debugger, Target::GetStaticBroadcasterClass().AsCString()),
    ExecutionContextScope (),
    m_debugger (debugger),
    m_platform_sp (platform_sp),
    m_mutex (Mutex::eMutexTypeRecursive), 
    m_arch (target_arch),
#ifndef LLDB_DISABLE_PYTHON
    m_images (this),
#else
    // FIXME: The module added notification needed for python scripting support 
    // causes a problem with in-memory-only Modules at startup if we have
    // a breakpoint (the ObjectFile is parsed before we've set the Section load
    // addresses leading to an invalid __LINKEDIT section addr on Mac OS X and
    // all the problems that will happen from that).  
    // As a temporary solution for iOS debugging (where all the modules are in-memory-only), 
    // disable this notification system there. The problem could still happen on 
    // an x86 system but it is much less common. 
    // <rdar://problem/12831670> describes the failure mode for on-iOS debugging.
    m_images (NULL),
#endif
    m_section_load_list (),
    m_breakpoint_list (false),
    m_internal_breakpoint_list (true),
    m_watchpoint_list (),
    m_process_sp (),
    m_valid (true),
    m_search_filter_sp (),
    m_image_search_paths (ImageSearchPathsChanged, this),
    m_scratch_ast_context_ap (NULL),
    m_scratch_ast_source_ap (NULL),
    m_ast_importer_ap (NULL),
    m_persistent_variables (),
    m_source_manager(*this),
    m_stop_hooks (),
    m_stop_hook_next_id (0),
    m_suppress_stop_hooks (false),
    m_suppress_synthetic_value(false)
{
    SetEventName (eBroadcastBitBreakpointChanged, "breakpoint-changed");
    SetEventName (eBroadcastBitModulesLoaded, "modules-loaded");
    SetEventName (eBroadcastBitModulesUnloaded, "modules-unloaded");
    SetEventName (eBroadcastBitWatchpointChanged, "watchpoint-changed");
    
    CheckInWithManager();

    LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_OBJECT));
    if (log)
        log->Printf ("%p Target::Target()", this);
    if (m_arch.IsValid())
    {
        LogIfAnyCategoriesSet(LIBLLDB_LOG_TARGET, "Target::Target created with architecture %s (%s)", m_arch.GetArchitectureName(), m_arch.GetTriple().getTriple().c_str());
    }
}

//----------------------------------------------------------------------
// Destructor
//----------------------------------------------------------------------
Target::~Target()
{
    LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_OBJECT));
    if (log)
        log->Printf ("%p Target::~Target()", this);
    DeleteCurrentProcess ();
}

void
Target::Dump (Stream *s, lldb::DescriptionLevel description_level)
{
//    s->Printf("%.*p: ", (int)sizeof(void*) * 2, this);
    if (description_level != lldb::eDescriptionLevelBrief)
    {
        s->Indent();
        s->PutCString("Target\n");
        s->IndentMore();
            m_images.Dump(s);
            m_breakpoint_list.Dump(s);
            m_internal_breakpoint_list.Dump(s);
        s->IndentLess();
    }
    else
    {
        Module *exe_module = GetExecutableModulePointer();
        if (exe_module)
            s->PutCString (exe_module->GetFileSpec().GetFilename().GetCString());
        else
            s->PutCString ("No executable module.");
    }
}

void
Target::CleanupProcess ()
{
    // Do any cleanup of the target we need to do between process instances.
    // NB It is better to do this before destroying the process in case the
    // clean up needs some help from the process.
    m_breakpoint_list.ClearAllBreakpointSites();
    m_internal_breakpoint_list.ClearAllBreakpointSites();
    // Disable watchpoints just on the debugger side.
    Mutex::Locker locker;
    this->GetWatchpointList().GetListMutex(locker);
    DisableAllWatchpoints(false);
    ClearAllWatchpointHitCounts();
}

void
Target::DeleteCurrentProcess ()
{
    if (m_process_sp.get())
    {
        m_section_load_list.Clear();
        if (m_process_sp->IsAlive())
            m_process_sp->Destroy();
        
        m_process_sp->Finalize();

        CleanupProcess ();

        m_process_sp.reset();
    }
}

const lldb::ProcessSP &
Target::CreateProcess (Listener &listener, const char *plugin_name, const FileSpec *crash_file)
{
    DeleteCurrentProcess ();
    m_process_sp = Process::FindPlugin(*this, plugin_name, listener, crash_file);
    return m_process_sp;
}

const lldb::ProcessSP &
Target::GetProcessSP () const
{
    return m_process_sp;
}

void
Target::Destroy()
{
    Mutex::Locker locker (m_mutex);
    m_valid = false;
    DeleteCurrentProcess ();
    m_platform_sp.reset();
    m_arch.Clear();
    m_images.Clear();
    m_section_load_list.Clear();
    const bool notify = false;
    m_breakpoint_list.RemoveAll(notify);
    m_internal_breakpoint_list.RemoveAll(notify);
    m_last_created_breakpoint.reset();
    m_last_created_watchpoint.reset();
    m_search_filter_sp.reset();
    m_image_search_paths.Clear(notify);
    m_scratch_ast_context_ap.reset();
    m_scratch_ast_source_ap.reset();
    m_ast_importer_ap.reset();
    m_persistent_variables.Clear();
    m_stop_hooks.clear();
    m_stop_hook_next_id = 0;
    m_suppress_stop_hooks = false;
    m_suppress_synthetic_value = false;
}


BreakpointList &
Target::GetBreakpointList(bool internal)
{
    if (internal)
        return m_internal_breakpoint_list;
    else
        return m_breakpoint_list;
}

const BreakpointList &
Target::GetBreakpointList(bool internal) const
{
    if (internal)
        return m_internal_breakpoint_list;
    else
        return m_breakpoint_list;
}

BreakpointSP
Target::GetBreakpointByID (break_id_t break_id)
{
    BreakpointSP bp_sp;

    if (LLDB_BREAK_ID_IS_INTERNAL (break_id))
        bp_sp = m_internal_breakpoint_list.FindBreakpointByID (break_id);
    else
        bp_sp = m_breakpoint_list.FindBreakpointByID (break_id);

    return bp_sp;
}

BreakpointSP
Target::CreateSourceRegexBreakpoint (const FileSpecList *containingModules,
                                     const FileSpecList *source_file_spec_list,
                                     RegularExpression &source_regex,
                                     bool internal)
{
    SearchFilterSP filter_sp(GetSearchFilterForModuleAndCUList (containingModules, source_file_spec_list));
    BreakpointResolverSP resolver_sp(new BreakpointResolverFileRegex (NULL, source_regex));
    return CreateBreakpoint (filter_sp, resolver_sp, internal);
}


BreakpointSP
Target::CreateBreakpoint (const FileSpecList *containingModules,
                          const FileSpec &file,
                          uint32_t line_no,
                          LazyBool check_inlines,
                          LazyBool skip_prologue,
                          bool internal)
{
    if (check_inlines == eLazyBoolCalculate)
    {
        const InlineStrategy inline_strategy = GetInlineStrategy();
        switch (inline_strategy)
        {
            case eInlineBreakpointsNever:
                check_inlines = eLazyBoolNo;
                break;
                
            case eInlineBreakpointsHeaders:
                if (file.IsSourceImplementationFile())
                    check_inlines = eLazyBoolNo;
                else
                    check_inlines = eLazyBoolYes;
                break;

            case eInlineBreakpointsAlways:
                check_inlines = eLazyBoolYes;
                break;
        }
    }
    SearchFilterSP filter_sp;
    if (check_inlines == eLazyBoolNo)
    {
        // Not checking for inlines, we are looking only for matching compile units
        FileSpecList compile_unit_list;
        compile_unit_list.Append (file);
        filter_sp = GetSearchFilterForModuleAndCUList (containingModules, &compile_unit_list);
    }
    else
    {
        filter_sp = GetSearchFilterForModuleList (containingModules);
    }
    BreakpointResolverSP resolver_sp(new BreakpointResolverFileLine (NULL,
                                                                     file,
                                                                     line_no,
                                                                     check_inlines,
                                                                     skip_prologue == eLazyBoolCalculate ? GetSkipPrologue() : skip_prologue));
    return CreateBreakpoint (filter_sp, resolver_sp, internal);
}


BreakpointSP
Target::CreateBreakpoint (lldb::addr_t addr, bool internal)
{
    Address so_addr;
    // Attempt to resolve our load address if possible, though it is ok if
    // it doesn't resolve to section/offset.

    // Try and resolve as a load address if possible
    m_section_load_list.ResolveLoadAddress(addr, so_addr);
    if (!so_addr.IsValid())
    {
        // The address didn't resolve, so just set this as an absolute address
        so_addr.SetOffset (addr);
    }
    BreakpointSP bp_sp (CreateBreakpoint(so_addr, internal));
    return bp_sp;
}

BreakpointSP
Target::CreateBreakpoint (Address &addr, bool internal)
{
    SearchFilterSP filter_sp(new SearchFilterForNonModuleSpecificSearches (shared_from_this()));
    BreakpointResolverSP resolver_sp (new BreakpointResolverAddress (NULL, addr));
    return CreateBreakpoint (filter_sp, resolver_sp, internal);
}

BreakpointSP
Target::CreateBreakpoint (const FileSpecList *containingModules,
                          const FileSpecList *containingSourceFiles,
                          const char *func_name, 
                          uint32_t func_name_type_mask, 
                          LazyBool skip_prologue,
                          bool internal)
{
    BreakpointSP bp_sp;
    if (func_name)
    {
        SearchFilterSP filter_sp(GetSearchFilterForModuleAndCUList (containingModules, containingSourceFiles));
        
        BreakpointResolverSP resolver_sp (new BreakpointResolverName (NULL, 
                                                                      func_name, 
                                                                      func_name_type_mask, 
                                                                      Breakpoint::Exact, 
                                                                      skip_prologue == eLazyBoolCalculate ? GetSkipPrologue() : skip_prologue));
        bp_sp = CreateBreakpoint (filter_sp, resolver_sp, internal);
    }
    return bp_sp;
}

lldb::BreakpointSP
Target::CreateBreakpoint (const FileSpecList *containingModules,
                          const FileSpecList *containingSourceFiles,
                          const std::vector<std::string> &func_names,
                          uint32_t func_name_type_mask,
                          LazyBool skip_prologue,
                          bool internal)
{
    BreakpointSP bp_sp;
    size_t num_names = func_names.size();
    if (num_names > 0)
    {
        SearchFilterSP filter_sp(GetSearchFilterForModuleAndCUList (containingModules, containingSourceFiles));
        
        BreakpointResolverSP resolver_sp (new BreakpointResolverName (NULL, 
                                                                      func_names,
                                                                      func_name_type_mask,
                                                                      skip_prologue == eLazyBoolCalculate ? GetSkipPrologue() : skip_prologue));
        bp_sp = CreateBreakpoint (filter_sp, resolver_sp, internal);
    }
    return bp_sp;
}

BreakpointSP
Target::CreateBreakpoint (const FileSpecList *containingModules,
                          const FileSpecList *containingSourceFiles,
                          const char *func_names[],
                          size_t num_names, 
                          uint32_t func_name_type_mask, 
                          LazyBool skip_prologue,
                          bool internal)
{
    BreakpointSP bp_sp;
    if (num_names > 0)
    {
        SearchFilterSP filter_sp(GetSearchFilterForModuleAndCUList (containingModules, containingSourceFiles));
        
        BreakpointResolverSP resolver_sp (new BreakpointResolverName (NULL, 
                                                                      func_names,
                                                                      num_names, 
                                                                      func_name_type_mask,
                                                                      skip_prologue == eLazyBoolCalculate ? GetSkipPrologue() : skip_prologue));
        bp_sp = CreateBreakpoint (filter_sp, resolver_sp, internal);
    }
    return bp_sp;
}

SearchFilterSP
Target::GetSearchFilterForModule (const FileSpec *containingModule)
{
    SearchFilterSP filter_sp;
    if (containingModule != NULL)
    {
        // TODO: We should look into sharing module based search filters
        // across many breakpoints like we do for the simple target based one
        filter_sp.reset (new SearchFilterByModule (shared_from_this(), *containingModule));
    }
    else
    {
        if (m_search_filter_sp.get() == NULL)
            m_search_filter_sp.reset (new SearchFilterForNonModuleSpecificSearches (shared_from_this()));
        filter_sp = m_search_filter_sp;
    }
    return filter_sp;
}

SearchFilterSP
Target::GetSearchFilterForModuleList (const FileSpecList *containingModules)
{
    SearchFilterSP filter_sp;
    if (containingModules && containingModules->GetSize() != 0)
    {
        // TODO: We should look into sharing module based search filters
        // across many breakpoints like we do for the simple target based one
        filter_sp.reset (new SearchFilterByModuleList (shared_from_this(), *containingModules));
    }
    else
    {
        if (m_search_filter_sp.get() == NULL)
            m_search_filter_sp.reset (new SearchFilterForNonModuleSpecificSearches (shared_from_this()));
        filter_sp = m_search_filter_sp;
    }
    return filter_sp;
}

SearchFilterSP
Target::GetSearchFilterForModuleAndCUList (const FileSpecList *containingModules,
                                           const FileSpecList *containingSourceFiles)
{
    if (containingSourceFiles == NULL || containingSourceFiles->GetSize() == 0)
        return GetSearchFilterForModuleList(containingModules);
        
    SearchFilterSP filter_sp;
    if (containingModules == NULL)
    {
        // We could make a special "CU List only SearchFilter".  Better yet was if these could be composable, 
        // but that will take a little reworking.
        
        filter_sp.reset (new SearchFilterByModuleListAndCU (shared_from_this(), FileSpecList(), *containingSourceFiles));
    }
    else
    {
        filter_sp.reset (new SearchFilterByModuleListAndCU (shared_from_this(), *containingModules, *containingSourceFiles));
    }
    return filter_sp;
}

BreakpointSP
Target::CreateFuncRegexBreakpoint (const FileSpecList *containingModules, 
                                   const FileSpecList *containingSourceFiles,
                                   RegularExpression &func_regex, 
                                   LazyBool skip_prologue,
                                   bool internal)
{
    SearchFilterSP filter_sp(GetSearchFilterForModuleAndCUList (containingModules, containingSourceFiles));
    BreakpointResolverSP resolver_sp(new BreakpointResolverName (NULL, 
                                                                 func_regex, 
                                                                 skip_prologue == eLazyBoolCalculate ? GetSkipPrologue() : skip_prologue));

    return CreateBreakpoint (filter_sp, resolver_sp, internal);
}

lldb::BreakpointSP
Target::CreateExceptionBreakpoint (enum lldb::LanguageType language, bool catch_bp, bool throw_bp, bool internal)
{
    return LanguageRuntime::CreateExceptionBreakpoint (*this, language, catch_bp, throw_bp, internal);
}
    
BreakpointSP
Target::CreateBreakpoint (SearchFilterSP &filter_sp, BreakpointResolverSP &resolver_sp, bool internal)
{
    BreakpointSP bp_sp;
    if (filter_sp && resolver_sp)
    {
        bp_sp.reset(new Breakpoint (*this, filter_sp, resolver_sp));
        resolver_sp->SetBreakpoint (bp_sp.get());

        if (internal)
            m_internal_breakpoint_list.Add (bp_sp, false);
        else
            m_breakpoint_list.Add (bp_sp, true);

        LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_BREAKPOINTS));
        if (log)
        {
            StreamString s;
            bp_sp->GetDescription(&s, lldb::eDescriptionLevelVerbose);
            log->Printf ("Target::%s (internal = %s) => break_id = %s\n", __FUNCTION__, internal ? "yes" : "no", s.GetData());
        }

        bp_sp->ResolveBreakpoint();
    }
    
    if (!internal && bp_sp)
    {
        m_last_created_breakpoint = bp_sp;
    }
    
    return bp_sp;
}

bool
Target::ProcessIsValid()
{
    return (m_process_sp && m_process_sp->IsAlive());
}

static bool
CheckIfWatchpointsExhausted(Target *target, Error &error)
{
    uint32_t num_supported_hardware_watchpoints;
    Error rc = target->GetProcessSP()->GetWatchpointSupportInfo(num_supported_hardware_watchpoints);
    if (rc.Success())
    {
        uint32_t num_current_watchpoints = target->GetWatchpointList().GetSize();
        if (num_current_watchpoints >= num_supported_hardware_watchpoints)
            error.SetErrorStringWithFormat("number of supported hardware watchpoints (%u) has been reached",
                                           num_supported_hardware_watchpoints);
    }
    return false;
}

// See also Watchpoint::SetWatchpointType(uint32_t type) and
// the OptionGroupWatchpoint::WatchType enum type.
WatchpointSP
Target::CreateWatchpoint(lldb::addr_t addr, size_t size, const ClangASTType *type, uint32_t kind, Error &error)
{
    LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_WATCHPOINTS));
    if (log)
        log->Printf("Target::%s (addr = 0x%8.8" PRIx64 " size = %" PRIu64 " type = %u)\n",
                    __FUNCTION__, addr, (uint64_t)size, kind);

    WatchpointSP wp_sp;
    if (!ProcessIsValid())
    {
        error.SetErrorString("process is not alive");
        return wp_sp;
    }
    if (addr == LLDB_INVALID_ADDRESS || size == 0)
    {
        if (size == 0)
            error.SetErrorString("cannot set a watchpoint with watch_size of 0");
        else
            error.SetErrorStringWithFormat("invalid watch address: %" PRIu64, addr);
        return wp_sp;
    }

    // Currently we only support one watchpoint per address, with total number
    // of watchpoints limited by the hardware which the inferior is running on.

    // Grab the list mutex while doing operations.
    const bool notify = false;   // Don't notify about all the state changes we do on creating the watchpoint.
    Mutex::Locker locker;
    this->GetWatchpointList().GetListMutex(locker);
    WatchpointSP matched_sp = m_watchpoint_list.FindByAddress(addr);
    if (matched_sp)
    {
        size_t old_size = matched_sp->GetByteSize();
        uint32_t old_type =
            (matched_sp->WatchpointRead() ? LLDB_WATCH_TYPE_READ : 0) |
            (matched_sp->WatchpointWrite() ? LLDB_WATCH_TYPE_WRITE : 0);
        // Return the existing watchpoint if both size and type match.
        if (size == old_size && kind == old_type) {
            wp_sp = matched_sp;
            wp_sp->SetEnabled(false, notify);
        } else {
            // Nil the matched watchpoint; we will be creating a new one.
            m_process_sp->DisableWatchpoint(matched_sp.get(), notify);
            m_watchpoint_list.Remove(matched_sp->GetID(), true);
        }
    }

    if (!wp_sp) 
    {
        wp_sp.reset(new Watchpoint(*this, addr, size, type));
        wp_sp->SetWatchpointType(kind, notify);
        m_watchpoint_list.Add (wp_sp, true);
    }

    error = m_process_sp->EnableWatchpoint(wp_sp.get(), notify);
    if (log)
        log->Printf("Target::%s (creation of watchpoint %s with id = %u)\n",
                    __FUNCTION__,
                    error.Success() ? "succeeded" : "failed",
                    wp_sp->GetID());

    if (error.Fail()) 
    {
        // Enabling the watchpoint on the device side failed.
        // Remove the said watchpoint from the list maintained by the target instance.
        m_watchpoint_list.Remove (wp_sp->GetID(), true);
        // See if we could provide more helpful error message.
        if (!CheckIfWatchpointsExhausted(this, error))
        {
            if (!OptionGroupWatchpoint::IsWatchSizeSupported(size))
                error.SetErrorStringWithFormat("watch size of %lu is not supported", size);
        }
        wp_sp.reset();
    }
    else
        m_last_created_watchpoint = wp_sp;
    return wp_sp;
}

void
Target::RemoveAllBreakpoints (bool internal_also)
{
    LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_BREAKPOINTS));
    if (log)
        log->Printf ("Target::%s (internal_also = %s)\n", __FUNCTION__, internal_also ? "yes" : "no");

    m_breakpoint_list.RemoveAll (true);
    if (internal_also)
        m_internal_breakpoint_list.RemoveAll (false);
        
    m_last_created_breakpoint.reset();
}

void
Target::DisableAllBreakpoints (bool internal_also)
{
    LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_BREAKPOINTS));
    if (log)
        log->Printf ("Target::%s (internal_also = %s)\n", __FUNCTION__, internal_also ? "yes" : "no");

    m_breakpoint_list.SetEnabledAll (false);
    if (internal_also)
        m_internal_breakpoint_list.SetEnabledAll (false);
}

void
Target::EnableAllBreakpoints (bool internal_also)
{
    LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_BREAKPOINTS));
    if (log)
        log->Printf ("Target::%s (internal_also = %s)\n", __FUNCTION__, internal_also ? "yes" : "no");

    m_breakpoint_list.SetEnabledAll (true);
    if (internal_also)
        m_internal_breakpoint_list.SetEnabledAll (true);
}

bool
Target::RemoveBreakpointByID (break_id_t break_id)
{
    LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_BREAKPOINTS));
    if (log)
        log->Printf ("Target::%s (break_id = %i, internal = %s)\n", __FUNCTION__, break_id, LLDB_BREAK_ID_IS_INTERNAL (break_id) ? "yes" : "no");

    if (DisableBreakpointByID (break_id))
    {
        if (LLDB_BREAK_ID_IS_INTERNAL (break_id))
            m_internal_breakpoint_list.Remove(break_id, false);
        else
        {
            if (m_last_created_breakpoint)
            {
                if (m_last_created_breakpoint->GetID() == break_id)
                    m_last_created_breakpoint.reset();
            }
            m_breakpoint_list.Remove(break_id, true);
        }
        return true;
    }
    return false;
}

bool
Target::DisableBreakpointByID (break_id_t break_id)
{
    LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_BREAKPOINTS));
    if (log)
        log->Printf ("Target::%s (break_id = %i, internal = %s)\n", __FUNCTION__, break_id, LLDB_BREAK_ID_IS_INTERNAL (break_id) ? "yes" : "no");

    BreakpointSP bp_sp;

    if (LLDB_BREAK_ID_IS_INTERNAL (break_id))
        bp_sp = m_internal_breakpoint_list.FindBreakpointByID (break_id);
    else
        bp_sp = m_breakpoint_list.FindBreakpointByID (break_id);
    if (bp_sp)
    {
        bp_sp->SetEnabled (false);
        return true;
    }
    return false;
}

bool
Target::EnableBreakpointByID (break_id_t break_id)
{
    LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_BREAKPOINTS));
    if (log)
        log->Printf ("Target::%s (break_id = %i, internal = %s)\n",
                     __FUNCTION__,
                     break_id,
                     LLDB_BREAK_ID_IS_INTERNAL (break_id) ? "yes" : "no");

    BreakpointSP bp_sp;

    if (LLDB_BREAK_ID_IS_INTERNAL (break_id))
        bp_sp = m_internal_breakpoint_list.FindBreakpointByID (break_id);
    else
        bp_sp = m_breakpoint_list.FindBreakpointByID (break_id);

    if (bp_sp)
    {
        bp_sp->SetEnabled (true);
        return true;
    }
    return false;
}

// The flag 'end_to_end', default to true, signifies that the operation is
// performed end to end, for both the debugger and the debuggee.

// Assumption: Caller holds the list mutex lock for m_watchpoint_list for end
// to end operations.
bool
Target::RemoveAllWatchpoints (bool end_to_end)
{
    LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_WATCHPOINTS));
    if (log)
        log->Printf ("Target::%s\n", __FUNCTION__);

    if (!end_to_end) {
        m_watchpoint_list.RemoveAll(true);
        return true;
    }

    // Otherwise, it's an end to end operation.

    if (!ProcessIsValid())
        return false;

    size_t num_watchpoints = m_watchpoint_list.GetSize();
    for (size_t i = 0; i < num_watchpoints; ++i)
    {
        WatchpointSP wp_sp = m_watchpoint_list.GetByIndex(i);
        if (!wp_sp)
            return false;

        Error rc = m_process_sp->DisableWatchpoint(wp_sp.get());
        if (rc.Fail())
            return false;
    }
    m_watchpoint_list.RemoveAll (true);
    return true; // Success!
}

// Assumption: Caller holds the list mutex lock for m_watchpoint_list for end to
// end operations.
bool
Target::DisableAllWatchpoints (bool end_to_end)
{
    LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_WATCHPOINTS));
    if (log)
        log->Printf ("Target::%s\n", __FUNCTION__);

    if (!end_to_end) {
        m_watchpoint_list.SetEnabledAll(false);
        return true;
    }

    // Otherwise, it's an end to end operation.

    if (!ProcessIsValid())
        return false;

    size_t num_watchpoints = m_watchpoint_list.GetSize();
    for (size_t i = 0; i < num_watchpoints; ++i)
    {
        WatchpointSP wp_sp = m_watchpoint_list.GetByIndex(i);
        if (!wp_sp)
            return false;

        Error rc = m_process_sp->DisableWatchpoint(wp_sp.get());
        if (rc.Fail())
            return false;
    }
    return true; // Success!
}

// Assumption: Caller holds the list mutex lock for m_watchpoint_list for end to
// end operations.
bool
Target::EnableAllWatchpoints (bool end_to_end)
{
    LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_WATCHPOINTS));
    if (log)
        log->Printf ("Target::%s\n", __FUNCTION__);

    if (!end_to_end) {
        m_watchpoint_list.SetEnabledAll(true);
        return true;
    }

    // Otherwise, it's an end to end operation.

    if (!ProcessIsValid())
        return false;

    size_t num_watchpoints = m_watchpoint_list.GetSize();
    for (size_t i = 0; i < num_watchpoints; ++i)
    {
        WatchpointSP wp_sp = m_watchpoint_list.GetByIndex(i);
        if (!wp_sp)
            return false;

        Error rc = m_process_sp->EnableWatchpoint(wp_sp.get());
        if (rc.Fail())
            return false;
    }
    return true; // Success!
}

// Assumption: Caller holds the list mutex lock for m_watchpoint_list.
bool
Target::ClearAllWatchpointHitCounts ()
{
    LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_WATCHPOINTS));
    if (log)
        log->Printf ("Target::%s\n", __FUNCTION__);

    size_t num_watchpoints = m_watchpoint_list.GetSize();
    for (size_t i = 0; i < num_watchpoints; ++i)
    {
        WatchpointSP wp_sp = m_watchpoint_list.GetByIndex(i);
        if (!wp_sp)
            return false;

        wp_sp->ResetHitCount();
    }
    return true; // Success!
}

// Assumption: Caller holds the list mutex lock for m_watchpoint_list
// during these operations.
bool
Target::IgnoreAllWatchpoints (uint32_t ignore_count)
{
    LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_WATCHPOINTS));
    if (log)
        log->Printf ("Target::%s\n", __FUNCTION__);

    if (!ProcessIsValid())
        return false;

    size_t num_watchpoints = m_watchpoint_list.GetSize();
    for (size_t i = 0; i < num_watchpoints; ++i)
    {
        WatchpointSP wp_sp = m_watchpoint_list.GetByIndex(i);
        if (!wp_sp)
            return false;

        wp_sp->SetIgnoreCount(ignore_count);
    }
    return true; // Success!
}

// Assumption: Caller holds the list mutex lock for m_watchpoint_list.
bool
Target::DisableWatchpointByID (lldb::watch_id_t watch_id)
{
    LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_WATCHPOINTS));
    if (log)
        log->Printf ("Target::%s (watch_id = %i)\n", __FUNCTION__, watch_id);

    if (!ProcessIsValid())
        return false;

    WatchpointSP wp_sp = m_watchpoint_list.FindByID (watch_id);
    if (wp_sp)
    {
        Error rc = m_process_sp->DisableWatchpoint(wp_sp.get());
        if (rc.Success())
            return true;

        // Else, fallthrough.
    }
    return false;
}

// Assumption: Caller holds the list mutex lock for m_watchpoint_list.
bool
Target::EnableWatchpointByID (lldb::watch_id_t watch_id)
{
    LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_WATCHPOINTS));
    if (log)
        log->Printf ("Target::%s (watch_id = %i)\n", __FUNCTION__, watch_id);

    if (!ProcessIsValid())
        return false;

    WatchpointSP wp_sp = m_watchpoint_list.FindByID (watch_id);
    if (wp_sp)
    {
        Error rc = m_process_sp->EnableWatchpoint(wp_sp.get());
        if (rc.Success())
            return true;

        // Else, fallthrough.
    }
    return false;
}

// Assumption: Caller holds the list mutex lock for m_watchpoint_list.
bool
Target::RemoveWatchpointByID (lldb::watch_id_t watch_id)
{
    LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_WATCHPOINTS));
    if (log)
        log->Printf ("Target::%s (watch_id = %i)\n", __FUNCTION__, watch_id);

    if (DisableWatchpointByID (watch_id))
    {
        m_watchpoint_list.Remove(watch_id, true);
        return true;
    }
    return false;
}

// Assumption: Caller holds the list mutex lock for m_watchpoint_list.
bool
Target::IgnoreWatchpointByID (lldb::watch_id_t watch_id, uint32_t ignore_count)
{
    LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_WATCHPOINTS));
    if (log)
        log->Printf ("Target::%s (watch_id = %i)\n", __FUNCTION__, watch_id);

    if (!ProcessIsValid())
        return false;

    WatchpointSP wp_sp = m_watchpoint_list.FindByID (watch_id);
    if (wp_sp)
    {
        wp_sp->SetIgnoreCount(ignore_count);
        return true;
    }
    return false;
}

ModuleSP
Target::GetExecutableModule ()
{
    return m_images.GetModuleAtIndex(0);
}

Module*
Target::GetExecutableModulePointer ()
{
    return m_images.GetModulePointerAtIndex(0);
}

static void
LoadScriptingResourceForModule (const ModuleSP &module_sp, Target *target)
{
    Error error;
    if (module_sp && !module_sp->LoadScriptingResourceInTarget(target, error))
    {
        target->GetDebugger().GetOutputStream().Printf("unable to load scripting data for module %s - error reported was %s\n",
                                                       module_sp->GetFileSpec().GetFileNameStrippingExtension().GetCString(),
                                                       error.AsCString());
    }
}

void
Target::SetExecutableModule (ModuleSP& executable_sp, bool get_dependent_files)
{
    LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_TARGET));
    m_images.Clear();
    m_scratch_ast_context_ap.reset();
    m_scratch_ast_source_ap.reset();
    m_ast_importer_ap.reset();
    
    if (executable_sp.get())
    {
        Timer scoped_timer (__PRETTY_FUNCTION__,
                            "Target::SetExecutableModule (executable = '%s/%s')",
                            executable_sp->GetFileSpec().GetDirectory().AsCString(),
                            executable_sp->GetFileSpec().GetFilename().AsCString());

        m_images.Append(executable_sp); // The first image is our exectuable file

        // If we haven't set an architecture yet, reset our architecture based on what we found in the executable module.
        if (!m_arch.IsValid())
        {
            m_arch = executable_sp->GetArchitecture();
            if (log)
              log->Printf ("Target::SetExecutableModule setting architecture to %s (%s) based on executable file", m_arch.GetArchitectureName(), m_arch.GetTriple().getTriple().c_str());
        }

        FileSpecList dependent_files;
        ObjectFile *executable_objfile = executable_sp->GetObjectFile();

        if (executable_objfile && get_dependent_files)
        {
            executable_objfile->GetDependentModules(dependent_files);
            for (uint32_t i=0; i<dependent_files.GetSize(); i++)
            {
                FileSpec dependent_file_spec (dependent_files.GetFileSpecPointerAtIndex(i));
                FileSpec platform_dependent_file_spec;
                if (m_platform_sp)
                    m_platform_sp->GetFile (dependent_file_spec, NULL, platform_dependent_file_spec);
                else
                    platform_dependent_file_spec = dependent_file_spec;

                ModuleSpec module_spec (platform_dependent_file_spec, m_arch);
                ModuleSP image_module_sp(GetSharedModule (module_spec));
                if (image_module_sp.get())
                {
                    ObjectFile *objfile = image_module_sp->GetObjectFile();
                    if (objfile)
                        objfile->GetDependentModules(dependent_files);
                }
            }
        }
    }
}


bool
Target::SetArchitecture (const ArchSpec &arch_spec)
{
    LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_TARGET));
    if (m_arch.IsCompatibleMatch(arch_spec) || !m_arch.IsValid())
    {
        // If we haven't got a valid arch spec, or the architectures are
        // compatible, so just update the architecture. Architectures can be
        // equal, yet the triple OS and vendor might change, so we need to do
        // the assignment here just in case.
        m_arch = arch_spec;
        if (log)
            log->Printf ("Target::SetArchitecture setting architecture to %s (%s)", arch_spec.GetArchitectureName(), arch_spec.GetTriple().getTriple().c_str());
        return true;
    }
    else
    {
        // If we have an executable file, try to reset the executable to the desired architecture
        if (log)
          log->Printf ("Target::SetArchitecture changing architecture to %s (%s)", arch_spec.GetArchitectureName(), arch_spec.GetTriple().getTriple().c_str());
        m_arch = arch_spec;
        ModuleSP executable_sp = GetExecutableModule ();
        m_images.Clear();
        m_scratch_ast_context_ap.reset();
        m_scratch_ast_source_ap.reset();
        m_ast_importer_ap.reset();
        // Need to do something about unsetting breakpoints.
        
        if (executable_sp)
        {
            if (log)
              log->Printf("Target::SetArchitecture Trying to select executable file architecture %s (%s)", arch_spec.GetArchitectureName(), arch_spec.GetTriple().getTriple().c_str());
            ModuleSpec module_spec (executable_sp->GetFileSpec(), arch_spec);
            Error error = ModuleList::GetSharedModule (module_spec, 
                                                       executable_sp, 
                                                       &GetExecutableSearchPaths(),
                                                       NULL, 
                                                       NULL);
                                          
            if (!error.Fail() && executable_sp)
            {
                SetExecutableModule (executable_sp, true);
                return true;
            }
        }
    }
    return false;
}

void
Target::WillClearList (const ModuleList& module_list)
{
}

void
Target::ModuleAdded (const ModuleList& module_list, const ModuleSP &module_sp)
{
    // A module is being added to this target for the first time
    ModuleList my_module_list;
    my_module_list.Append(module_sp);
    LoadScriptingResourceForModule(module_sp, this);
    ModulesDidLoad (my_module_list);
}

void
Target::ModuleRemoved (const ModuleList& module_list, const ModuleSP &module_sp)
{
    // A module is being added to this target for the first time
    ModuleList my_module_list;
    my_module_list.Append(module_sp);
    ModulesDidUnload (my_module_list);
}

void
Target::ModuleUpdated (const ModuleList& module_list, const ModuleSP &old_module_sp, const ModuleSP &new_module_sp)
{
    // A module is replacing an already added module
    m_breakpoint_list.UpdateBreakpointsWhenModuleIsReplaced(old_module_sp, new_module_sp);
}

void
Target::ModulesDidLoad (ModuleList &module_list)
{
    if (module_list.GetSize())
    {
        m_breakpoint_list.UpdateBreakpoints (module_list, true);
        // TODO: make event data that packages up the module_list
        BroadcastEvent (eBroadcastBitModulesLoaded, NULL);
    }
}

void
Target::ModulesDidUnload (ModuleList &module_list)
{
    if (module_list.GetSize())
    {
        m_breakpoint_list.UpdateBreakpoints (module_list, false);
        // TODO: make event data that packages up the module_list
        BroadcastEvent (eBroadcastBitModulesUnloaded, NULL);
    }
}

bool
Target::ModuleIsExcludedForNonModuleSpecificSearches (const FileSpec &module_file_spec)
{
    if (GetBreakpointsConsultPlatformAvoidList())
    {
        ModuleList matchingModules;
        ModuleSpec module_spec (module_file_spec);
        size_t num_modules = GetImages().FindModules(module_spec, matchingModules);
        
        // If there is more than one module for this file spec, only return true if ALL the modules are on the
        // black list.
        if (num_modules > 0)
        {
            for (int i  = 0; i < num_modules; i++)
            {
                if (!ModuleIsExcludedForNonModuleSpecificSearches (matchingModules.GetModuleAtIndex(i)))
                    return false;
            }
            return true;
        }
    }
    return false;
}

bool
Target::ModuleIsExcludedForNonModuleSpecificSearches (const lldb::ModuleSP &module_sp)
{
    if (GetBreakpointsConsultPlatformAvoidList())
    {
        if (m_platform_sp)
            return m_platform_sp->ModuleIsExcludedForNonModuleSpecificSearches (*this, module_sp);
    }
    return false;
}

size_t
Target::ReadMemoryFromFileCache (const Address& addr, void *dst, size_t dst_len, Error &error)
{
    SectionSP section_sp (addr.GetSection());
    if (section_sp)
    {
        // If the contents of this section are encrypted, the on-disk file is unusuable.  Read only from live memory.
        if (section_sp->IsEncrypted())
        {
            error.SetErrorString("section is encrypted");
            return 0;
        }
        ModuleSP module_sp (section_sp->GetModule());
        if (module_sp)
        {
            ObjectFile *objfile = section_sp->GetModule()->GetObjectFile();
            if (objfile)
            {
                size_t bytes_read = objfile->ReadSectionData (section_sp.get(), 
                                                              addr.GetOffset(), 
                                                              dst, 
                                                              dst_len);
                if (bytes_read > 0)
                    return bytes_read;
                else
                    error.SetErrorStringWithFormat("error reading data from section %s", section_sp->GetName().GetCString());
            }
            else
                error.SetErrorString("address isn't from a object file");
        }
        else
            error.SetErrorString("address isn't in a module");
    }
    else
        error.SetErrorString("address doesn't contain a section that points to a section in a object file");

    return 0;
}

size_t
Target::ReadMemory (const Address& addr,
                    bool prefer_file_cache,
                    void *dst,
                    size_t dst_len,
                    Error &error,
                    lldb::addr_t *load_addr_ptr)
{
    error.Clear();
    
    // if we end up reading this from process memory, we will fill this
    // with the actual load address
    if (load_addr_ptr)
        *load_addr_ptr = LLDB_INVALID_ADDRESS;
    
    size_t bytes_read = 0;

    addr_t load_addr = LLDB_INVALID_ADDRESS;
    addr_t file_addr = LLDB_INVALID_ADDRESS;
    Address resolved_addr;
    if (!addr.IsSectionOffset())
    {
        if (m_section_load_list.IsEmpty())
        {
            // No sections are loaded, so we must assume we are not running
            // yet and anything we are given is a file address.
            file_addr = addr.GetOffset(); // "addr" doesn't have a section, so its offset is the file address
            m_images.ResolveFileAddress (file_addr, resolved_addr);            
        }
        else
        {
            // We have at least one section loaded. This can be becuase
            // we have manually loaded some sections with "target modules load ..."
            // or because we have have a live process that has sections loaded
            // through the dynamic loader
            load_addr = addr.GetOffset(); // "addr" doesn't have a section, so its offset is the load address
            m_section_load_list.ResolveLoadAddress (load_addr, resolved_addr);
        }
    }
    if (!resolved_addr.IsValid())
        resolved_addr = addr;
    

    if (prefer_file_cache)
    {
        bytes_read = ReadMemoryFromFileCache (resolved_addr, dst, dst_len, error);
        if (bytes_read > 0)
            return bytes_read;
    }
    
    if (ProcessIsValid())
    {
        if (load_addr == LLDB_INVALID_ADDRESS)
            load_addr = resolved_addr.GetLoadAddress (this);

        if (load_addr == LLDB_INVALID_ADDRESS)
        {
            ModuleSP addr_module_sp (resolved_addr.GetModule());
            if (addr_module_sp && addr_module_sp->GetFileSpec())
                error.SetErrorStringWithFormat("%s[0x%" PRIx64 "] can't be resolved, %s in not currently loaded",
                                               addr_module_sp->GetFileSpec().GetFilename().AsCString(), 
                                               resolved_addr.GetFileAddress(),
                                               addr_module_sp->GetFileSpec().GetFilename().AsCString());
            else
                error.SetErrorStringWithFormat("0x%" PRIx64 " can't be resolved", resolved_addr.GetFileAddress());
        }
        else
        {
            bytes_read = m_process_sp->ReadMemory(load_addr, dst, dst_len, error);
            if (bytes_read != dst_len)
            {
                if (error.Success())
                {
                    if (bytes_read == 0)
                        error.SetErrorStringWithFormat("read memory from 0x%" PRIx64 " failed", load_addr);
                    else
                        error.SetErrorStringWithFormat("only %" PRIu64 " of %" PRIu64 " bytes were read from memory at 0x%" PRIx64, (uint64_t)bytes_read, (uint64_t)dst_len, load_addr);
                }
            }
            if (bytes_read)
            {
                if (load_addr_ptr)
                    *load_addr_ptr = load_addr;
                return bytes_read;
            }
            // If the address is not section offset we have an address that
            // doesn't resolve to any address in any currently loaded shared
            // libaries and we failed to read memory so there isn't anything
            // more we can do. If it is section offset, we might be able to
            // read cached memory from the object file.
            if (!resolved_addr.IsSectionOffset())
                return 0;
        }
    }
    
    if (!prefer_file_cache && resolved_addr.IsSectionOffset())
    {
        // If we didn't already try and read from the object file cache, then
        // try it after failing to read from the process.
        return ReadMemoryFromFileCache (resolved_addr, dst, dst_len, error);
    }
    return 0;
}

size_t
Target::ReadScalarIntegerFromMemory (const Address& addr, 
                                     bool prefer_file_cache,
                                     uint32_t byte_size, 
                                     bool is_signed, 
                                     Scalar &scalar, 
                                     Error &error)
{
    uint64_t uval;
    
    if (byte_size <= sizeof(uval))
    {
        size_t bytes_read = ReadMemory (addr, prefer_file_cache, &uval, byte_size, error);
        if (bytes_read == byte_size)
        {
            DataExtractor data (&uval, sizeof(uval), m_arch.GetByteOrder(), m_arch.GetAddressByteSize());
            uint32_t offset = 0;
            if (byte_size <= 4)
                scalar = data.GetMaxU32 (&offset, byte_size);
            else
                scalar = data.GetMaxU64 (&offset, byte_size);
            
            if (is_signed)
                scalar.SignExtend(byte_size * 8);
            return bytes_read;
        }
    }
    else
    {
        error.SetErrorStringWithFormat ("byte size of %u is too large for integer scalar type", byte_size);
    }
    return 0;
}

uint64_t
Target::ReadUnsignedIntegerFromMemory (const Address& addr, 
                                       bool prefer_file_cache,
                                       size_t integer_byte_size, 
                                       uint64_t fail_value, 
                                       Error &error)
{
    Scalar scalar;
    if (ReadScalarIntegerFromMemory (addr, 
                                     prefer_file_cache, 
                                     integer_byte_size, 
                                     false, 
                                     scalar, 
                                     error))
        return scalar.ULongLong(fail_value);
    return fail_value;
}

bool
Target::ReadPointerFromMemory (const Address& addr, 
                               bool prefer_file_cache,
                               Error &error,
                               Address &pointer_addr)
{
    Scalar scalar;
    if (ReadScalarIntegerFromMemory (addr, 
                                     prefer_file_cache, 
                                     m_arch.GetAddressByteSize(), 
                                     false, 
                                     scalar, 
                                     error))
    {
        addr_t pointer_vm_addr = scalar.ULongLong(LLDB_INVALID_ADDRESS);
        if (pointer_vm_addr != LLDB_INVALID_ADDRESS)
        {
            if (m_section_load_list.IsEmpty())
            {
                // No sections are loaded, so we must assume we are not running
                // yet and anything we are given is a file address.
                m_images.ResolveFileAddress (pointer_vm_addr, pointer_addr);
            }
            else
            {
                // We have at least one section loaded. This can be becuase
                // we have manually loaded some sections with "target modules load ..."
                // or because we have have a live process that has sections loaded
                // through the dynamic loader
                m_section_load_list.ResolveLoadAddress (pointer_vm_addr, pointer_addr);
            }
            // We weren't able to resolve the pointer value, so just return
            // an address with no section
            if (!pointer_addr.IsValid())
                pointer_addr.SetOffset (pointer_vm_addr);
            return true;
            
        }
    }
    return false;
}

ModuleSP
Target::GetSharedModule (const ModuleSpec &module_spec, Error *error_ptr)
{
    ModuleSP module_sp;

    Error error;

    // First see if we already have this module in our module list.  If we do, then we're done, we don't need
    // to consult the shared modules list.  But only do this if we are passed a UUID.
    
    if (module_spec.GetUUID().IsValid())
        module_sp = m_images.FindFirstModule(module_spec);
        
    if (!module_sp)
    {
        ModuleSP old_module_sp; // This will get filled in if we have a new version of the library
        bool did_create_module = false;
    
        // If there are image search path entries, try to use them first to acquire a suitable image.
        if (m_image_search_paths.GetSize())
        {
            ModuleSpec transformed_spec (module_spec);
            if (m_image_search_paths.RemapPath (module_spec.GetFileSpec().GetDirectory(), transformed_spec.GetFileSpec().GetDirectory()))
            {
                transformed_spec.GetFileSpec().GetFilename() = module_spec.GetFileSpec().GetFilename();
                error = ModuleList::GetSharedModule (transformed_spec, 
                                                     module_sp, 
                                                     &GetExecutableSearchPaths(),
                                                     &old_module_sp, 
                                                     &did_create_module);
            }
        }
        
        if (!module_sp)
        {
            // If we have a UUID, we can check our global shared module list in case
            // we already have it. If we don't have a valid UUID, then we can't since
            // the path in "module_spec" will be a platform path, and we will need to
            // let the platform find that file. For example, we could be asking for
            // "/usr/lib/dyld" and if we do not have a UUID, we don't want to pick
            // the local copy of "/usr/lib/dyld" since our platform could be a remote
            // platform that has its own "/usr/lib/dyld" in an SDK or in a local file
            // cache.
            if (module_spec.GetUUID().IsValid())
            {
                // We have a UUID, it is OK to check the global module list...
                error = ModuleList::GetSharedModule (module_spec,
                                                     module_sp, 
                                                     &GetExecutableSearchPaths(),
                                                     &old_module_sp,
                                                     &did_create_module);
            }

            if (!module_sp)
            {
                // The platform is responsible for finding and caching an appropriate
                // module in the shared module cache.
                if (m_platform_sp)
                {
                    FileSpec platform_file_spec;        
                    error = m_platform_sp->GetSharedModule (module_spec, 
                                                            module_sp, 
                                                            &GetExecutableSearchPaths(),
                                                            &old_module_sp,
                                                            &did_create_module);
                }
                else
                {
                    error.SetErrorString("no platform is currently set");
                }
            }
        }

        // We found a module that wasn't in our target list.  Let's make sure that there wasn't an equivalent
        // module in the list already, and if there was, let's remove it.
        if (module_sp)
        {
            ObjectFile *objfile = module_sp->GetObjectFile();
            if (objfile)
            {
                switch (objfile->GetType())
                {
                    case ObjectFile::eTypeCoreFile:      /// A core file that has a checkpoint of a program's execution state
                    case ObjectFile::eTypeExecutable:    /// A normal executable
                    case ObjectFile::eTypeDynamicLinker: /// The platform's dynamic linker executable
                    case ObjectFile::eTypeObjectFile:    /// An intermediate object file
                    case ObjectFile::eTypeSharedLibrary: /// A shared library that can be used during execution
                        break;
                    case ObjectFile::eTypeDebugInfo:     /// An object file that contains only debug information
                        if (error_ptr)
                            error_ptr->SetErrorString("debug info files aren't valid target modules, please specify an executable");
                        return ModuleSP();
                    case ObjectFile::eTypeStubLibrary:   /// A library that can be linked against but not used for execution
                        if (error_ptr)
                            error_ptr->SetErrorString("stub libraries aren't valid target modules, please specify an executable");
                        return ModuleSP();
                    default:
                        if (error_ptr)
                            error_ptr->SetErrorString("unsupported file type, please specify an executable");
                        return ModuleSP();
                }
                // GetSharedModule is not guaranteed to find the old shared module, for instance
                // in the common case where you pass in the UUID, it is only going to find the one
                // module matching the UUID.  In fact, it has no good way to know what the "old module"
                // relevant to this target is, since there might be many copies of a module with this file spec
                // in various running debug sessions, but only one of them will belong to this target.
                // So let's remove the UUID from the module list, and look in the target's module list.
                // Only do this if there is SOMETHING else in the module spec...
                if (!old_module_sp)
                {
                    if (module_spec.GetUUID().IsValid() && !module_spec.GetFileSpec().GetFilename().IsEmpty() && !module_spec.GetFileSpec().GetDirectory().IsEmpty())
                    {
                        ModuleSpec module_spec_copy(module_spec.GetFileSpec());
                        module_spec_copy.GetUUID().Clear();
                        
                        ModuleList found_modules;
                        size_t num_found = m_images.FindModules (module_spec_copy, found_modules);
                        if (num_found == 1)
                        {
                            old_module_sp = found_modules.GetModuleAtIndex(0);
                        }
                    }
                }
                
                if (old_module_sp && m_images.GetIndexForModule (old_module_sp.get()) != LLDB_INVALID_INDEX32)
                {
                    m_images.ReplaceModule(old_module_sp, module_sp);
                    Module *old_module_ptr = old_module_sp.get();
                    old_module_sp.reset();
                    ModuleList::RemoveSharedModuleIfOrphaned (old_module_ptr);
                }
                else
                    m_images.Append(module_sp);
            }
        }
    }
    if (error_ptr)
        *error_ptr = error;
    return module_sp;
}


TargetSP
Target::CalculateTarget ()
{
    return shared_from_this();
}

ProcessSP
Target::CalculateProcess ()
{
    return ProcessSP();
}

ThreadSP
Target::CalculateThread ()
{
    return ThreadSP();
}

StackFrameSP
Target::CalculateStackFrame ()
{
    return StackFrameSP();
}

void
Target::CalculateExecutionContext (ExecutionContext &exe_ctx)
{
    exe_ctx.Clear();
    exe_ctx.SetTargetPtr(this);
}

PathMappingList &
Target::GetImageSearchPathList ()
{
    return m_image_search_paths;
}

void
Target::ImageSearchPathsChanged 
(
    const PathMappingList &path_list,
    void *baton
)
{
    Target *target = (Target *)baton;
    ModuleSP exe_module_sp (target->GetExecutableModule());
    if (exe_module_sp)
    {
        target->m_images.Clear();
        target->SetExecutableModule (exe_module_sp, true);
    }
}

ClangASTContext *
Target::GetScratchClangASTContext(bool create_on_demand)
{
    // Now see if we know the target triple, and if so, create our scratch AST context:
    if (m_scratch_ast_context_ap.get() == NULL && m_arch.IsValid() && create_on_demand)
    {
        m_scratch_ast_context_ap.reset (new ClangASTContext(m_arch.GetTriple().str().c_str()));
        m_scratch_ast_source_ap.reset (new ClangASTSource(shared_from_this()));
        m_scratch_ast_source_ap->InstallASTContext(m_scratch_ast_context_ap->getASTContext());
        llvm::OwningPtr<clang::ExternalASTSource> proxy_ast_source(m_scratch_ast_source_ap->CreateProxy());
        m_scratch_ast_context_ap->SetExternalSource(proxy_ast_source);
    }
    return m_scratch_ast_context_ap.get();
}

ClangASTImporter *
Target::GetClangASTImporter()
{
    ClangASTImporter *ast_importer = m_ast_importer_ap.get();
    
    if (!ast_importer)
    {
        ast_importer = new ClangASTImporter();
        m_ast_importer_ap.reset(ast_importer);
    }
    
    return ast_importer;
}

void
Target::SettingsInitialize ()
{
    Process::SettingsInitialize ();
}

void
Target::SettingsTerminate ()
{
    Process::SettingsTerminate ();
}

FileSpecList
Target::GetDefaultExecutableSearchPaths ()
{
    TargetPropertiesSP properties_sp(Target::GetGlobalProperties());
    if (properties_sp)
        return properties_sp->GetExecutableSearchPaths();
    return FileSpecList();
}

ArchSpec
Target::GetDefaultArchitecture ()
{
    TargetPropertiesSP properties_sp(Target::GetGlobalProperties());
    if (properties_sp)
        return properties_sp->GetDefaultArchitecture();
    return ArchSpec();
}

void
Target::SetDefaultArchitecture (const ArchSpec &arch)
{
    TargetPropertiesSP properties_sp(Target::GetGlobalProperties());
    if (properties_sp)
    {
        LogIfAnyCategoriesSet(LIBLLDB_LOG_TARGET, "Target::SetDefaultArchitecture setting target's default architecture to  %s (%s)", arch.GetArchitectureName(), arch.GetTriple().getTriple().c_str());
        return properties_sp->SetDefaultArchitecture(arch);
    }
}

Target *
Target::GetTargetFromContexts (const ExecutionContext *exe_ctx_ptr, const SymbolContext *sc_ptr)
{
    // The target can either exist in the "process" of ExecutionContext, or in 
    // the "target_sp" member of SymbolContext. This accessor helper function
    // will get the target from one of these locations.

    Target *target = NULL;
    if (sc_ptr != NULL)
        target = sc_ptr->target_sp.get();
    if (target == NULL && exe_ctx_ptr)
        target = exe_ctx_ptr->GetTargetPtr();
    return target;
}

ExecutionResults
Target::EvaluateExpression
(
    const char *expr_cstr,
    StackFrame *frame,
    lldb::ValueObjectSP &result_valobj_sp,
    const EvaluateExpressionOptions& options
)
{
    result_valobj_sp.reset();
    
    ExecutionResults execution_results = eExecutionSetupError;

    if (expr_cstr == NULL || expr_cstr[0] == '\0')
        return execution_results;

    // We shouldn't run stop hooks in expressions.
    // Be sure to reset this if you return anywhere within this function.
    bool old_suppress_value = m_suppress_stop_hooks;
    m_suppress_stop_hooks = true;

    ExecutionContext exe_ctx;
    
    if (frame)
    {
        frame->CalculateExecutionContext(exe_ctx);
    }
    else if (m_process_sp)
    {
        m_process_sp->CalculateExecutionContext(exe_ctx);
    }
    else
    {
        CalculateExecutionContext(exe_ctx);
    }
    
    // Make sure we aren't just trying to see the value of a persistent
    // variable (something like "$0")
    lldb::ClangExpressionVariableSP persistent_var_sp;
    // Only check for persistent variables the expression starts with a '$' 
    if (expr_cstr[0] == '$')
        persistent_var_sp = m_persistent_variables.GetVariable (expr_cstr);

    if (persistent_var_sp)
    {
        result_valobj_sp = persistent_var_sp->GetValueObject ();
        execution_results = eExecutionCompleted;
    }
    else
    {
        const char *prefix = GetExpressionPrefixContentsAsCString();
                
        execution_results = ClangUserExpression::Evaluate (exe_ctx, 
                                                           options.GetExecutionPolicy(),
                                                           lldb::eLanguageTypeUnknown,
                                                           options.DoesCoerceToId() ? ClangUserExpression::eResultTypeId : ClangUserExpression::eResultTypeAny,
                                                           options.DoesUnwindOnError(),
                                                           expr_cstr, 
                                                           prefix, 
                                                           result_valobj_sp,
                                                           options.GetRunOthers(),
                                                           options.GetTimeoutUsec());
    }
    
    m_suppress_stop_hooks = old_suppress_value;
    
    return execution_results;
}

lldb::addr_t
Target::GetCallableLoadAddress (lldb::addr_t load_addr, AddressClass addr_class) const
{
    addr_t code_addr = load_addr;
    switch (m_arch.GetMachine())
    {
    case llvm::Triple::arm:
    case llvm::Triple::thumb:
        switch (addr_class)
        {
        case eAddressClassData:
        case eAddressClassDebug:
            return LLDB_INVALID_ADDRESS;
            
        case eAddressClassUnknown:
        case eAddressClassInvalid:
        case eAddressClassCode:
        case eAddressClassCodeAlternateISA:
        case eAddressClassRuntime:
            // Check if bit zero it no set?
            if ((code_addr & 1ull) == 0)
            {
                // Bit zero isn't set, check if the address is a multiple of 2?
                if (code_addr & 2ull)
                {
                    // The address is a multiple of 2 so it must be thumb, set bit zero
                    code_addr |= 1ull;
                }
                else if (addr_class == eAddressClassCodeAlternateISA)
                {
                    // We checked the address and the address claims to be the alternate ISA
                    // which means thumb, so set bit zero.
                    code_addr |= 1ull;
                }
            }
            break;
        }
        break;
            
    default:
        break;
    }
    return code_addr;
}

lldb::addr_t
Target::GetOpcodeLoadAddress (lldb::addr_t load_addr, AddressClass addr_class) const
{
    addr_t opcode_addr = load_addr;
    switch (m_arch.GetMachine())
    {
    case llvm::Triple::arm:
    case llvm::Triple::thumb:
        switch (addr_class)
        {
        case eAddressClassData:
        case eAddressClassDebug:
            return LLDB_INVALID_ADDRESS;
            
        case eAddressClassInvalid:
        case eAddressClassUnknown:
        case eAddressClassCode:
        case eAddressClassCodeAlternateISA:
        case eAddressClassRuntime:
            opcode_addr &= ~(1ull);
            break;
        }
        break;
            
    default:
        break;
    }
    return opcode_addr;
}

lldb::user_id_t
Target::AddStopHook (Target::StopHookSP &new_hook_sp)
{
    lldb::user_id_t new_uid = ++m_stop_hook_next_id;
    new_hook_sp.reset (new StopHook(shared_from_this(), new_uid));
    m_stop_hooks[new_uid] = new_hook_sp;
    return new_uid;
}

bool
Target::RemoveStopHookByID (lldb::user_id_t user_id)
{
    size_t num_removed;
    num_removed = m_stop_hooks.erase (user_id);
    if (num_removed == 0)
        return false;
    else
        return true;
}

void
Target::RemoveAllStopHooks ()
{
    m_stop_hooks.clear();
}

Target::StopHookSP
Target::GetStopHookByID (lldb::user_id_t user_id)
{
    StopHookSP found_hook;
    
    StopHookCollection::iterator specified_hook_iter;
    specified_hook_iter = m_stop_hooks.find (user_id);
    if (specified_hook_iter != m_stop_hooks.end())
        found_hook = (*specified_hook_iter).second;
    return found_hook;
}

bool
Target::SetStopHookActiveStateByID (lldb::user_id_t user_id, bool active_state)
{
    StopHookCollection::iterator specified_hook_iter;
    specified_hook_iter = m_stop_hooks.find (user_id);
    if (specified_hook_iter == m_stop_hooks.end())
        return false;
        
    (*specified_hook_iter).second->SetIsActive (active_state);
    return true;
}

void
Target::SetAllStopHooksActiveState (bool active_state)
{
    StopHookCollection::iterator pos, end = m_stop_hooks.end();
    for (pos = m_stop_hooks.begin(); pos != end; pos++)
    {
        (*pos).second->SetIsActive (active_state);
    }
}

void
Target::RunStopHooks ()
{
    if (m_suppress_stop_hooks)
        return;
        
    if (!m_process_sp)
        return;
    
    // <rdar://problem/12027563> make sure we check that we are not stopped because of us running a user expression
    // since in that case we do not want to run the stop-hooks
    if (m_process_sp->GetModIDRef().IsLastResumeForUserExpression())
        return;
    
    if (m_stop_hooks.empty())
        return;
        
    StopHookCollection::iterator pos, end = m_stop_hooks.end();
        
    // If there aren't any active stop hooks, don't bother either:
    bool any_active_hooks = false;
    for (pos = m_stop_hooks.begin(); pos != end; pos++)
    {
        if ((*pos).second->IsActive())
        {
            any_active_hooks = true;
            break;
        }
    }
    if (!any_active_hooks)
        return;
    
    CommandReturnObject result;
    
    std::vector<ExecutionContext> exc_ctx_with_reasons;
    std::vector<SymbolContext> sym_ctx_with_reasons;
    
    ThreadList &cur_threadlist = m_process_sp->GetThreadList();
    size_t num_threads = cur_threadlist.GetSize();
    for (size_t i = 0; i < num_threads; i++)
    {
        lldb::ThreadSP cur_thread_sp = cur_threadlist.GetThreadAtIndex (i);
        if (cur_thread_sp->ThreadStoppedForAReason())
        {
            lldb::StackFrameSP cur_frame_sp = cur_thread_sp->GetStackFrameAtIndex(0);
            exc_ctx_with_reasons.push_back(ExecutionContext(m_process_sp.get(), cur_thread_sp.get(), cur_frame_sp.get()));
            sym_ctx_with_reasons.push_back(cur_frame_sp->GetSymbolContext(eSymbolContextEverything));
        }
    }
    
    // If no threads stopped for a reason, don't run the stop-hooks.
    size_t num_exe_ctx = exc_ctx_with_reasons.size();
    if (num_exe_ctx == 0)
        return;
    
    result.SetImmediateOutputStream (m_debugger.GetAsyncOutputStream());
    result.SetImmediateErrorStream (m_debugger.GetAsyncErrorStream());
    
    bool keep_going = true;
    bool hooks_ran = false;
    bool print_hook_header;
    bool print_thread_header;
    
    if (num_exe_ctx == 1)
        print_thread_header = false;
    else
        print_thread_header = true;
        
    if (m_stop_hooks.size() == 1)
        print_hook_header = false;
    else
        print_hook_header = true;
        
    for (pos = m_stop_hooks.begin(); keep_going && pos != end; pos++)
    {
        // result.Clear();
        StopHookSP cur_hook_sp = (*pos).second;
        if (!cur_hook_sp->IsActive())
            continue;
        
        bool any_thread_matched = false;
        for (size_t i = 0; keep_going && i < num_exe_ctx; i++)
        {
            if ((cur_hook_sp->GetSpecifier () == NULL 
                  || cur_hook_sp->GetSpecifier()->SymbolContextMatches(sym_ctx_with_reasons[i]))
                && (cur_hook_sp->GetThreadSpecifier() == NULL
                    || cur_hook_sp->GetThreadSpecifier()->ThreadPassesBasicTests(exc_ctx_with_reasons[i].GetThreadRef())))
            {
                if (!hooks_ran)
                {
                    hooks_ran = true;
                }
                if (print_hook_header && !any_thread_matched)
                {
                    const char *cmd = (cur_hook_sp->GetCommands().GetSize() == 1 ?
                                       cur_hook_sp->GetCommands().GetStringAtIndex(0) :
                                       NULL);
                    if (cmd)
                        result.AppendMessageWithFormat("\n- Hook %" PRIu64 " (%s)\n", cur_hook_sp->GetID(), cmd);
                    else
                        result.AppendMessageWithFormat("\n- Hook %" PRIu64 "\n", cur_hook_sp->GetID());
                    any_thread_matched = true;
                }
                
                if (print_thread_header)
                    result.AppendMessageWithFormat("-- Thread %d\n", exc_ctx_with_reasons[i].GetThreadPtr()->GetIndexID());
                
                bool stop_on_continue = true; 
                bool stop_on_error = true; 
                bool echo_commands = false;
                bool print_results = true; 
                GetDebugger().GetCommandInterpreter().HandleCommands (cur_hook_sp->GetCommands(), 
                                                                      &exc_ctx_with_reasons[i], 
                                                                      stop_on_continue, 
                                                                      stop_on_error, 
                                                                      echo_commands,
                                                                      print_results,
                                                                      eLazyBoolNo,
                                                                      result);

                // If the command started the target going again, we should bag out of
                // running the stop hooks.
                if ((result.GetStatus() == eReturnStatusSuccessContinuingNoResult) || 
                    (result.GetStatus() == eReturnStatusSuccessContinuingResult))
                {
                    result.AppendMessageWithFormat ("Aborting stop hooks, hook %" PRIu64 " set the program running.", cur_hook_sp->GetID());
                    keep_going = false;
                }
            }
        }
    }

    result.GetImmediateOutputStream()->Flush();
    result.GetImmediateErrorStream()->Flush();
}


//--------------------------------------------------------------
// class Target::StopHook
//--------------------------------------------------------------


Target::StopHook::StopHook (lldb::TargetSP target_sp, lldb::user_id_t uid) :
        UserID (uid),
        m_target_sp (target_sp),
        m_commands (),
        m_specifier_sp (),
        m_thread_spec_ap(NULL),
        m_active (true)
{
}

Target::StopHook::StopHook (const StopHook &rhs) :
        UserID (rhs.GetID()),
        m_target_sp (rhs.m_target_sp),
        m_commands (rhs.m_commands),
        m_specifier_sp (rhs.m_specifier_sp),
        m_thread_spec_ap (NULL),
        m_active (rhs.m_active)
{
    if (rhs.m_thread_spec_ap.get() != NULL)
        m_thread_spec_ap.reset (new ThreadSpec(*rhs.m_thread_spec_ap.get()));
}
        

Target::StopHook::~StopHook ()
{
}

void
Target::StopHook::SetThreadSpecifier (ThreadSpec *specifier)
{
    m_thread_spec_ap.reset (specifier);
}
        

void
Target::StopHook::GetDescription (Stream *s, lldb::DescriptionLevel level) const
{
    int indent_level = s->GetIndentLevel();

    s->SetIndentLevel(indent_level + 2);

    s->Printf ("Hook: %" PRIu64 "\n", GetID());
    if (m_active)
        s->Indent ("State: enabled\n");
    else
        s->Indent ("State: disabled\n");    
    
    if (m_specifier_sp)
    {
        s->Indent();
        s->PutCString ("Specifier:\n");
        s->SetIndentLevel (indent_level + 4);
        m_specifier_sp->GetDescription (s, level);
        s->SetIndentLevel (indent_level + 2);
    }

    if (m_thread_spec_ap.get() != NULL)
    {
        StreamString tmp;
        s->Indent("Thread:\n");
        m_thread_spec_ap->GetDescription (&tmp, level);
        s->SetIndentLevel (indent_level + 4);
        s->Indent (tmp.GetData());
        s->PutCString ("\n");
        s->SetIndentLevel (indent_level + 2);
    }

    s->Indent ("Commands: \n");
    s->SetIndentLevel (indent_level + 4);
    uint32_t num_commands = m_commands.GetSize();
    for (uint32_t i = 0; i < num_commands; i++)
    {
        s->Indent(m_commands.GetStringAtIndex(i));
        s->PutCString ("\n");
    }
    s->SetIndentLevel (indent_level);
}

//--------------------------------------------------------------
// class TargetProperties
//--------------------------------------------------------------

OptionEnumValueElement
lldb_private::g_dynamic_value_types[] =
{
    { eNoDynamicValues,      "no-dynamic-values", "Don't calculate the dynamic type of values"},
    { eDynamicCanRunTarget,  "run-target",        "Calculate the dynamic type of values even if you have to run the target."},
    { eDynamicDontRunTarget, "no-run-target",     "Calculate the dynamic type of values, but don't run the target."},
    { 0, NULL, NULL }
};

static OptionEnumValueElement
g_inline_breakpoint_enums[] =
{
    { eInlineBreakpointsNever,   "never",     "Never look for inline breakpoint locations (fastest). This setting should only be used if you know that no inlining occurs in your programs."},
    { eInlineBreakpointsHeaders, "headers",   "Only check for inline breakpoint locations when setting breakpoints in header files, but not when setting breakpoint in implementation source files (default)."},
    { eInlineBreakpointsAlways,  "always",    "Always look for inline breakpoint locations when setting file and line breakpoints (slower but most accurate)."},
    { 0, NULL, NULL }
};

static PropertyDefinition
g_properties[] =
{
    { "default-arch"                       , OptionValue::eTypeArch      , true , 0                         , NULL, NULL, "Default architecture to choose, when there's a choice." },
    { "expr-prefix"                        , OptionValue::eTypeFileSpec  , false, 0                         , NULL, NULL, "Path to a file containing expressions to be prepended to all expressions." },
    { "prefer-dynamic-value"               , OptionValue::eTypeEnum      , false, eNoDynamicValues          , NULL, g_dynamic_value_types, "Should printed values be shown as their dynamic value." },
    { "enable-synthetic-value"             , OptionValue::eTypeBoolean   , false, true                      , NULL, NULL, "Should synthetic values be used by default whenever available." },
    { "skip-prologue"                      , OptionValue::eTypeBoolean   , false, true                      , NULL, NULL, "Skip function prologues when setting breakpoints by name." },
    { "source-map"                         , OptionValue::eTypePathMap   , false, 0                         , NULL, NULL, "Source path remappings used to track the change of location between a source file when built, and "
      "where it exists on the current system.  It consists of an array of duples, the first element of each duple is "
      "some part (starting at the root) of the path to the file when it was built, "
      "and the second is where the remainder of the original build hierarchy is rooted on the local system.  "
      "Each element of the array is checked in order and the first one that results in a match wins." },
    { "exec-search-paths"                  , OptionValue::eTypeFileSpecList, false, 0                       , NULL, NULL, "Executable search paths to use when locating executable files whose paths don't match the local file system." },
    { "max-children-count"                 , OptionValue::eTypeSInt64    , false, 256                       , NULL, NULL, "Maximum number of children to expand in any level of depth." },
    { "max-string-summary-length"          , OptionValue::eTypeSInt64    , false, 1024                      , NULL, NULL, "Maximum number of characters to show when using %s in summary strings." },
    { "breakpoints-use-platform-avoid-list", OptionValue::eTypeBoolean   , false, true                      , NULL, NULL, "Consult the platform module avoid list when setting non-module specific breakpoints." },
    { "arg0"                               , OptionValue::eTypeString    , false, 0                         , NULL, NULL, "The first argument passed to the program in the argument array which can be different from the executable itself." },
    { "run-args"                           , OptionValue::eTypeArgs      , false, 0                         , NULL, NULL, "A list containing all the arguments to be passed to the executable when it is run. Note that this does NOT include the argv[0] which is in target.arg0." },
    { "env-vars"                           , OptionValue::eTypeDictionary, false, OptionValue::eTypeString  , NULL, NULL, "A list of all the environment variables to be passed to the executable's environment, and their values." },
    { "inherit-env"                        , OptionValue::eTypeBoolean   , false, true                      , NULL, NULL, "Inherit the environment from the process that is running LLDB." },
    { "input-path"                         , OptionValue::eTypeFileSpec  , false, 0                         , NULL, NULL, "The file/path to be used by the executable program for reading its standard input." },
    { "output-path"                        , OptionValue::eTypeFileSpec  , false, 0                         , NULL, NULL, "The file/path to be used by the executable program for writing its standard output." },
    { "error-path"                         , OptionValue::eTypeFileSpec  , false, 0                         , NULL, NULL, "The file/path to be used by the executable program for writing its standard error." },
    { "disable-aslr"                       , OptionValue::eTypeBoolean   , false, true                      , NULL, NULL, "Disable Address Space Layout Randomization (ASLR)" },
    { "disable-stdio"                      , OptionValue::eTypeBoolean   , false, false                     , NULL, NULL, "Disable stdin/stdout for process (e.g. for a GUI application)" },
    { "inline-breakpoint-strategy"         , OptionValue::eTypeEnum      , false, eInlineBreakpointsHeaders , NULL, g_inline_breakpoint_enums, "The strategy to use when settings breakpoints by file and line. "
        "Breakpoint locations can end up being inlined by the compiler, so that a compile unit 'a.c' might contain an inlined function from another source file. "
        "Usually this is limitted to breakpoint locations from inlined functions from header or other include files, or more accurately non-implementation source files. "
        "Sometimes code might #include implementation files and cause inlined breakpoint locations in inlined implementation files. "
        "Always checking for inlined breakpoint locations can be expensive (memory and time), so we try to minimize the "
        "times we look for inlined locations. This setting allows you to control exactly which strategy is used when settings "
        "file and line breakpoints." },
    { NULL                                 , OptionValue::eTypeInvalid   , false, 0                         , NULL, NULL, NULL }
};
enum
{
    ePropertyDefaultArch,
    ePropertyExprPrefix,
    ePropertyPreferDynamic,
    ePropertyEnableSynthetic,
    ePropertySkipPrologue,
    ePropertySourceMap,
    ePropertyExecutableSearchPaths,
    ePropertyMaxChildrenCount,
    ePropertyMaxSummaryLength,
    ePropertyBreakpointUseAvoidList,
    ePropertyArg0,
    ePropertyRunArgs,
    ePropertyEnvVars,
    ePropertyInheritEnv,
    ePropertyInputPath,
    ePropertyOutputPath,
    ePropertyErrorPath,
    ePropertyDisableASLR,
    ePropertyDisableSTDIO,
    ePropertyInlineStrategy
};


class TargetOptionValueProperties : public OptionValueProperties
{
public:
    TargetOptionValueProperties (const ConstString &name) :
        OptionValueProperties (name),
        m_target (NULL),
        m_got_host_env (false)
    {
    }

    // This constructor is used when creating TargetOptionValueProperties when it
    // is part of a new lldb_private::Target instance. It will copy all current
    // global property values as needed
    TargetOptionValueProperties (Target *target, const TargetPropertiesSP &target_properties_sp) :
        OptionValueProperties(*target_properties_sp->GetValueProperties()),
        m_target (target),
        m_got_host_env (false)
    {
    }

    virtual const Property *
    GetPropertyAtIndex (const ExecutionContext *exe_ctx, bool will_modify, uint32_t idx) const
    {
        // When gettings the value for a key from the target options, we will always
        // try and grab the setting from the current target if there is one. Else we just
        // use the one from this instance.
        if (idx == ePropertyEnvVars)
            GetHostEnvironmentIfNeeded ();
            
        if (exe_ctx)
        {
            Target *target = exe_ctx->GetTargetPtr();
            if (target)
            {
                TargetOptionValueProperties *target_properties = static_cast<TargetOptionValueProperties *>(target->GetValueProperties().get());
                if (this != target_properties)
                    return target_properties->ProtectedGetPropertyAtIndex (idx);
            }
        }
        return ProtectedGetPropertyAtIndex (idx);
    }
protected:
    
    void
    GetHostEnvironmentIfNeeded () const
    {
        if (!m_got_host_env)
        {
            if (m_target)
            {
                m_got_host_env = true;
                const uint32_t idx = ePropertyInheritEnv;
                if (GetPropertyAtIndexAsBoolean (NULL, idx, g_properties[idx].default_uint_value != 0))
                {
                    PlatformSP platform_sp (m_target->GetPlatform());
                    if (platform_sp)
                    {
                        StringList env;
                        if (platform_sp->GetEnvironment(env))
                        {
                            OptionValueDictionary *env_dict = GetPropertyAtIndexAsOptionValueDictionary (NULL, ePropertyEnvVars);
                            if (env_dict)
                            {
                                const bool can_replace = false;
                                const size_t envc = env.GetSize();
                                for (size_t idx=0; idx<envc; idx++)
                                {
                                    const char *env_entry = env.GetStringAtIndex (idx);
                                    if (env_entry)
                                    {
                                        const char *equal_pos = ::strchr(env_entry, '=');
                                        ConstString key;
                                        // It is ok to have environment variables with no values
                                        const char *value = NULL;
                                        if (equal_pos)
                                        {
                                            key.SetCStringWithLength(env_entry, equal_pos - env_entry);
                                            if (equal_pos[1])
                                                value = equal_pos + 1;
                                        }
                                        else
                                        {
                                            key.SetCString(env_entry);
                                        }
                                        // Don't allow existing keys to be replaced with ones we get from the platform environment
                                        env_dict->SetValueForKey(key, OptionValueSP(new OptionValueString(value)), can_replace);
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
    Target *m_target;
    mutable bool m_got_host_env;
};

TargetProperties::TargetProperties (Target *target) :
    Properties ()
{
    if (target)
    {
        m_collection_sp.reset (new TargetOptionValueProperties(target, Target::GetGlobalProperties()));
    }
    else
    {
        m_collection_sp.reset (new TargetOptionValueProperties(ConstString("target")));
        m_collection_sp->Initialize(g_properties);
        m_collection_sp->AppendProperty(ConstString("process"),
                                        ConstString("Settings specify to processes."),
                                        true,
                                        Process::GetGlobalProperties()->GetValueProperties());
    }
}

TargetProperties::~TargetProperties ()
{
}
ArchSpec
TargetProperties::GetDefaultArchitecture () const
{
    OptionValueArch *value = m_collection_sp->GetPropertyAtIndexAsOptionValueArch (NULL, ePropertyDefaultArch);
    if (value)
        return value->GetCurrentValue();
    return ArchSpec();
}

void
TargetProperties::SetDefaultArchitecture (const ArchSpec& arch)
{
    OptionValueArch *value = m_collection_sp->GetPropertyAtIndexAsOptionValueArch (NULL, ePropertyDefaultArch);
    if (value)
        return value->SetCurrentValue(arch, true);
}

lldb::DynamicValueType
TargetProperties::GetPreferDynamicValue() const
{
    const uint32_t idx = ePropertyPreferDynamic;
    return (lldb::DynamicValueType)m_collection_sp->GetPropertyAtIndexAsEnumeration (NULL, idx, g_properties[idx].default_uint_value);
}

bool
TargetProperties::GetDisableASLR () const
{
    const uint32_t idx = ePropertyDisableASLR;
    return m_collection_sp->GetPropertyAtIndexAsBoolean (NULL, idx, g_properties[idx].default_uint_value != 0);
}

void
TargetProperties::SetDisableASLR (bool b)
{
    const uint32_t idx = ePropertyDisableASLR;
    m_collection_sp->SetPropertyAtIndexAsBoolean (NULL, idx, b);
}

bool
TargetProperties::GetDisableSTDIO () const
{
    const uint32_t idx = ePropertyDisableSTDIO;
    return m_collection_sp->GetPropertyAtIndexAsBoolean (NULL, idx, g_properties[idx].default_uint_value != 0);
}

void
TargetProperties::SetDisableSTDIO (bool b)
{
    const uint32_t idx = ePropertyDisableSTDIO;
    m_collection_sp->SetPropertyAtIndexAsBoolean (NULL, idx, b);
}

InlineStrategy
TargetProperties::GetInlineStrategy () const
{
    const uint32_t idx = ePropertyInlineStrategy;
    return (InlineStrategy)m_collection_sp->GetPropertyAtIndexAsEnumeration (NULL, idx, g_properties[idx].default_uint_value);
}

const char *
TargetProperties::GetArg0 () const
{
    const uint32_t idx = ePropertyArg0;
    return m_collection_sp->GetPropertyAtIndexAsString (NULL, idx, NULL);
}

void
TargetProperties::SetArg0 (const char *arg)
{
    const uint32_t idx = ePropertyArg0;
    m_collection_sp->SetPropertyAtIndexAsString (NULL, idx, arg);
}

bool
TargetProperties::GetRunArguments (Args &args) const
{
    const uint32_t idx = ePropertyRunArgs;
    return m_collection_sp->GetPropertyAtIndexAsArgs (NULL, idx, args);
}

void
TargetProperties::SetRunArguments (const Args &args)
{
    const uint32_t idx = ePropertyRunArgs;
    m_collection_sp->SetPropertyAtIndexFromArgs (NULL, idx, args);
}

size_t
TargetProperties::GetEnvironmentAsArgs (Args &env) const
{
    const uint32_t idx = ePropertyEnvVars;
    return m_collection_sp->GetPropertyAtIndexAsArgs (NULL, idx, env);
}

bool
TargetProperties::GetSkipPrologue() const
{
    const uint32_t idx = ePropertySkipPrologue;
    return m_collection_sp->GetPropertyAtIndexAsBoolean (NULL, idx, g_properties[idx].default_uint_value != 0);
}

PathMappingList &
TargetProperties::GetSourcePathMap () const
{
    const uint32_t idx = ePropertySourceMap;
    OptionValuePathMappings *option_value = m_collection_sp->GetPropertyAtIndexAsOptionValuePathMappings (NULL, false, idx);
    assert(option_value);
    return option_value->GetCurrentValue();
}

FileSpecList &
TargetProperties::GetExecutableSearchPaths ()
{
    const uint32_t idx = ePropertyExecutableSearchPaths;
    OptionValueFileSpecList *option_value = m_collection_sp->GetPropertyAtIndexAsOptionValueFileSpecList (NULL, false, idx);
    assert(option_value);
    return option_value->GetCurrentValue();
}

bool
TargetProperties::GetEnableSyntheticValue () const
{
    const uint32_t idx = ePropertyEnableSynthetic;
    return m_collection_sp->GetPropertyAtIndexAsBoolean (NULL, idx, g_properties[idx].default_uint_value != 0);
}

uint32_t
TargetProperties::GetMaximumNumberOfChildrenToDisplay() const
{
    const uint32_t idx = ePropertyMaxChildrenCount;
    return m_collection_sp->GetPropertyAtIndexAsSInt64 (NULL, idx, g_properties[idx].default_uint_value);
}

uint32_t
TargetProperties::GetMaximumSizeOfStringSummary() const
{
    const uint32_t idx = ePropertyMaxSummaryLength;
    return m_collection_sp->GetPropertyAtIndexAsSInt64 (NULL, idx, g_properties[idx].default_uint_value);
}

FileSpec
TargetProperties::GetStandardInputPath () const
{
    const uint32_t idx = ePropertyInputPath;
    return m_collection_sp->GetPropertyAtIndexAsFileSpec (NULL, idx);
}

void
TargetProperties::SetStandardInputPath (const char *p)
{
    const uint32_t idx = ePropertyInputPath;
    m_collection_sp->SetPropertyAtIndexAsString (NULL, idx, p);
}

FileSpec
TargetProperties::GetStandardOutputPath () const
{
    const uint32_t idx = ePropertyOutputPath;
    return m_collection_sp->GetPropertyAtIndexAsFileSpec (NULL, idx);
}

void
TargetProperties::SetStandardOutputPath (const char *p)
{
    const uint32_t idx = ePropertyOutputPath;
    m_collection_sp->SetPropertyAtIndexAsString (NULL, idx, p);
}

FileSpec
TargetProperties::GetStandardErrorPath () const
{
    const uint32_t idx = ePropertyErrorPath;
    return m_collection_sp->GetPropertyAtIndexAsFileSpec(NULL, idx);
}

const char *
TargetProperties::GetExpressionPrefixContentsAsCString ()
{
    const uint32_t idx = ePropertyExprPrefix;
    OptionValueFileSpec *file = m_collection_sp->GetPropertyAtIndexAsOptionValueFileSpec (NULL, false, idx);
    if (file)
    {
        const bool null_terminate = true;
        DataBufferSP data_sp(file->GetFileContents(null_terminate));
        if (data_sp)
            return (const char *) data_sp->GetBytes();
    }
    return NULL;
}

void
TargetProperties::SetStandardErrorPath (const char *p)
{
    const uint32_t idx = ePropertyErrorPath;
    m_collection_sp->SetPropertyAtIndexAsString (NULL, idx, p);
}

bool
TargetProperties::GetBreakpointsConsultPlatformAvoidList ()
{
    const uint32_t idx = ePropertyBreakpointUseAvoidList;
    return m_collection_sp->GetPropertyAtIndexAsBoolean (NULL, idx, g_properties[idx].default_uint_value != 0);
}

const TargetPropertiesSP &
Target::GetGlobalProperties()
{
    static TargetPropertiesSP g_settings_sp;
    if (!g_settings_sp)
    {
        g_settings_sp.reset (new TargetProperties (NULL));
    }
    return g_settings_sp;
}

const ConstString &
Target::TargetEventData::GetFlavorString ()
{
    static ConstString g_flavor ("Target::TargetEventData");
    return g_flavor;
}

const ConstString &
Target::TargetEventData::GetFlavor () const
{
    return TargetEventData::GetFlavorString ();
}

Target::TargetEventData::TargetEventData (const lldb::TargetSP &new_target_sp) :
    EventData(),
    m_target_sp (new_target_sp)
{
}

Target::TargetEventData::~TargetEventData()
{

}

void
Target::TargetEventData::Dump (Stream *s) const
{

}

const TargetSP
Target::TargetEventData::GetTargetFromEvent (const lldb::EventSP &event_sp)
{
    TargetSP target_sp;

    const TargetEventData *data = GetEventDataFromEvent (event_sp.get());
    if (data)
        target_sp = data->m_target_sp;

    return target_sp;
}

const Target::TargetEventData *
Target::TargetEventData::GetEventDataFromEvent (const Event *event_ptr)
{
    if (event_ptr)
    {
        const EventData *event_data = event_ptr->GetData();
        if (event_data && event_data->GetFlavor() == TargetEventData::GetFlavorString())
            return static_cast <const TargetEventData *> (event_ptr->GetData());
    }
    return NULL;
}