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llvm-project/lldb/source/Plugins/DynamicLoader/MacOSX-DYLD/DynamicLoaderMacOSXDYLD.cpp
Greg Clayton 8b2fe6dcbd Modified LLDB expressions to not have to JIT and run code just to see variable 
values or persistent expression variables. Now if an expression consists of
a value that is a child of a variable, or of a persistent variable only, we
will create a value object for it and make a ValueObjectConstResult from it to
freeze the value (for program variables only, not persistent variables) and
avoid running JITed code. For everything else we still parse up and JIT code
and run it in the inferior. 

There was also a lot of clean up in the expression code. I made the 
ClangExpressionVariables be stored in collections of shared pointers instead
of in collections of objects. This will help stop a lot of copy constructors on
these large objects and also cleans up the code considerably. The persistent
clang expression variables were moved over to the Target to ensure they persist
across process executions.

Added the ability for lldb_private::Target objects to evaluate expressions.
We want to evaluate expressions at the target level in case we aren't running
yet, or we have just completed running. We still want to be able to access the
persistent expression variables between runs, and also evaluate constant 
expressions. 

Added extra logging to the dynamic loader plug-in for MacOSX. ModuleList objects
can now dump their contents with the UUID, arch and full paths being logged with
appropriate prefix values.

Thread hardened the Communication class a bit by making the connection auto_ptr
member into a shared pointer member and then making a local copy of the shared
pointer in each method that uses it to make sure another thread can't nuke the
connection object while it is being used by another thread.

Added a new file to the lldb/test/load_unload test that causes the test a.out file
to link to the libd.dylib file all the time. This will allow us to test using
the DYLD_LIBRARY_PATH environment variable after moving libd.dylib somewhere else.

llvm-svn: 121745
2010-12-14 02:59:59 +00:00

1310 lines
52 KiB
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Raw Blame History

//===-- DynamicLoaderMacOSXDYLD.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/Breakpoint/StoppointCallbackContext.h"
#include "lldb/Core/DataBuffer.h"
#include "lldb/Core/DataBufferHeap.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/State.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Target/ObjCLanguageRuntime.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
#include "lldb/Target/ThreadPlanRunToAddress.h"
#include "lldb/Target/StackFrame.h"
#include "DynamicLoaderMacOSXDYLD.h"
//#define ENABLE_DEBUG_PRINTF // COMMENT THIS LINE OUT PRIOR TO CHECKIN
#ifdef ENABLE_DEBUG_PRINTF
#include <stdio.h>
#define DEBUG_PRINTF(fmt, ...) printf(fmt, ## __VA_ARGS__)
#else
#define DEBUG_PRINTF(fmt, ...)
#endif
using namespace lldb;
using namespace lldb_private;
using namespace llvm::MachO;
/// FIXME - The ObjC Runtime trampoline handler doesn't really belong here.
/// I am putting it here so I can invoke it in the Trampoline code here, but
/// it should be moved to the ObjC Runtime support when it is set up.
DynamicLoaderMacOSXDYLD::DYLDImageInfo *
DynamicLoaderMacOSXDYLD::GetImageInfo (const FileSpec &file_spec, const UUID &uuid)
{
DYLDImageInfo::collection::iterator pos, end = m_dyld_image_infos.end();
for (pos = m_dyld_image_infos.begin(); pos != end; ++pos)
{
if (pos->uuid == uuid && pos->file_spec == file_spec)
return &(*pos);
}
if (m_dyld.uuid == uuid && m_dyld.file_spec == file_spec)
return &m_dyld;
return NULL;
}
//----------------------------------------------------------------------
// Create an instance of this class. This function is filled into
// the plugin info class that gets handed out by the plugin factory and
// allows the lldb to instantiate an instance of this class.
//----------------------------------------------------------------------
DynamicLoader *
DynamicLoaderMacOSXDYLD::CreateInstance (Process* process)
{
return new DynamicLoaderMacOSXDYLD (process);
}
//----------------------------------------------------------------------
// Constructor
//----------------------------------------------------------------------
DynamicLoaderMacOSXDYLD::DynamicLoaderMacOSXDYLD (Process* process) :
DynamicLoader(process),
m_dyld(),
m_dyld_all_image_infos_addr(LLDB_INVALID_ADDRESS),
m_dyld_all_image_infos(),
m_dyld_all_image_infos_stop_id (UINT32_MAX),
m_break_id(LLDB_INVALID_BREAK_ID),
m_dyld_image_infos(),
m_dyld_image_infos_stop_id (UINT32_MAX),
m_mutex(Mutex::eMutexTypeRecursive)
{
}
//----------------------------------------------------------------------
// Destructor
//----------------------------------------------------------------------
DynamicLoaderMacOSXDYLD::~DynamicLoaderMacOSXDYLD()
{
Clear(true);
}
//------------------------------------------------------------------
/// Called after attaching a process.
///
/// Allow DynamicLoader plug-ins to execute some code after
/// attaching to a process.
//------------------------------------------------------------------
void
DynamicLoaderMacOSXDYLD::DidAttach ()
{
PrivateInitialize(m_process);
LocateDYLD ();
SetNotificationBreakpoint ();
}
//------------------------------------------------------------------
/// Called after attaching a process.
///
/// Allow DynamicLoader plug-ins to execute some code after
/// attaching to a process.
//------------------------------------------------------------------
void
DynamicLoaderMacOSXDYLD::DidLaunch ()
{
PrivateInitialize(m_process);
LocateDYLD ();
SetNotificationBreakpoint ();
}
//----------------------------------------------------------------------
// Clear out the state of this class.
//----------------------------------------------------------------------
void
DynamicLoaderMacOSXDYLD::Clear (bool clear_process)
{
Mutex::Locker locker(m_mutex);
if (m_process->IsAlive() && LLDB_BREAK_ID_IS_VALID(m_break_id))
m_process->ClearBreakpointSiteByID(m_break_id);
if (clear_process)
m_process = NULL;
m_dyld.Clear(false);
m_dyld_all_image_infos_addr = LLDB_INVALID_ADDRESS;
m_dyld_all_image_infos.Clear();
m_break_id = LLDB_INVALID_BREAK_ID;
m_dyld_image_infos.clear();
}
//----------------------------------------------------------------------
// Check if we have found DYLD yet
//----------------------------------------------------------------------
bool
DynamicLoaderMacOSXDYLD::DidSetNotificationBreakpoint() const
{
return LLDB_BREAK_ID_IS_VALID (m_break_id);
}
//----------------------------------------------------------------------
// Try and figure out where dyld is by first asking the Process
// if it knows (which currently calls down in the the lldb::Process
// to get the DYLD info (available on SnowLeopard only). If that fails,
// then check in the default addresses.
//----------------------------------------------------------------------
bool
DynamicLoaderMacOSXDYLD::LocateDYLD()
{
if (m_dyld_all_image_infos_addr == LLDB_INVALID_ADDRESS)
m_dyld_all_image_infos_addr = m_process->GetImageInfoAddress ();
if (m_dyld_all_image_infos_addr != LLDB_INVALID_ADDRESS)
{
if (ReadAllImageInfosStructure ())
{
if (m_dyld_all_image_infos.dyldImageLoadAddress != LLDB_INVALID_ADDRESS)
return ReadDYLDInfoFromMemoryAndSetNotificationCallback (m_dyld_all_image_infos.dyldImageLoadAddress);
else
return ReadDYLDInfoFromMemoryAndSetNotificationCallback (m_dyld_all_image_infos_addr & 0xfffffffffff00000ull);
}
}
// Check some default values
Module *executable = m_process->GetTarget().GetExecutableModule().get();
if (executable)
{
if (executable->GetArchitecture().GetAddressByteSize() == 8)
{
return ReadDYLDInfoFromMemoryAndSetNotificationCallback(0x7fff5fc00000ull);
}
#if defined (__arm__)
else
{
ArchSpec arm_arch("arm");
if (arm_arch == executable->Arch())
return ReadDYLDInfoFromMemoryAndSetNotificationCallback(0x2fe00000);
}
#endif
return ReadDYLDInfoFromMemoryAndSetNotificationCallback(0x8fe00000);
}
return false;
}
//----------------------------------------------------------------------
// Assume that dyld is in memory at ADDR and try to parse it's load
// commands
//----------------------------------------------------------------------
bool
DynamicLoaderMacOSXDYLD::ReadDYLDInfoFromMemoryAndSetNotificationCallback(lldb::addr_t addr)
{
DataExtractor data; // Load command data
if (ReadMachHeader (addr, &m_dyld.header, &data))
{
if (m_dyld.header.filetype == HeaderFileTypeDynamicLinkEditor)
{
m_dyld.address = addr;
ModuleSP dyld_module_sp;
if (ParseLoadCommands (data, m_dyld, &m_dyld.file_spec))
{
if (m_dyld.file_spec)
{
ArchSpec dyld_arch(eArchTypeMachO, m_dyld.header.cputype, m_dyld.header.cpusubtype);
dyld_module_sp = m_process->GetTarget().GetImages().FindFirstModuleForFileSpec (m_dyld.file_spec);
if (dyld_module_sp.get() == NULL || dyld_module_sp->GetArchitecture() != dyld_arch)
{
dyld_module_sp = m_process->GetTarget().GetSharedModule (m_dyld.file_spec,
dyld_arch,
&m_dyld.uuid);
}
UpdateImageLoadAddress(dyld_module_sp.get(), m_dyld);
}
}
if (m_dyld_all_image_infos_addr == LLDB_INVALID_ADDRESS && dyld_module_sp.get())
{
static ConstString g_dyld_all_image_infos ("dyld_all_image_infos");
const Symbol *symbol = dyld_module_sp->FindFirstSymbolWithNameAndType (g_dyld_all_image_infos, eSymbolTypeData);
if (symbol)
m_dyld_all_image_infos_addr = symbol->GetValue().GetLoadAddress(&m_process->GetTarget());
}
// Update all image infos
UpdateAllImageInfos();
// If we didn't have an executable before, but now we do, then the
// dyld module shared pointer might be unique and we may need to add
// it again (since Target::SetExecutableModule() will clear the
// images). So append the dyld module back to the list if it is
/// unique!
if (m_process->GetTarget().GetImages().AppendIfNeeded (dyld_module_sp))
UpdateImageLoadAddress(dyld_module_sp.get(), m_dyld);
return true;
}
}
return false;
}
bool
DynamicLoaderMacOSXDYLD::NeedToLocateDYLD () const
{
return m_dyld_all_image_infos_addr == LLDB_INVALID_ADDRESS;
}
bool
DynamicLoaderMacOSXDYLD::UpdateCommPageLoadAddress(Module *module)
{
bool changed = false;
if (module)
{
ObjectFile *image_object_file = module->GetObjectFile();
if (image_object_file)
{
SectionList *section_list = image_object_file->GetSectionList ();
if (section_list)
{
uint32_t num_sections = section_list->GetSize();
for (uint32_t i=0; i<num_sections; ++i)
{
Section* section = section_list->GetSectionAtIndex (i).get();
if (section)
{
const addr_t new_section_load_addr = section->GetFileAddress ();
const addr_t old_section_load_addr = m_process->GetTarget().GetSectionLoadList().GetSectionLoadAddress (section);
if (old_section_load_addr == LLDB_INVALID_ADDRESS ||
old_section_load_addr != new_section_load_addr)
{
if (m_process->GetTarget().GetSectionLoadList().SetSectionLoadAddress (section, section->GetFileAddress ()))
changed = true;
}
}
}
}
}
}
return changed;
}
//----------------------------------------------------------------------
// Update the load addresses for all segments in MODULE using the
// updated INFO that is passed in.
//----------------------------------------------------------------------
bool
DynamicLoaderMacOSXDYLD::UpdateImageLoadAddress (Module *module, struct DYLDImageInfo& info)
{
bool changed = false;
if (module)
{
ObjectFile *image_object_file = module->GetObjectFile();
if (image_object_file)
{
SectionList *section_list = image_object_file->GetSectionList ();
if (section_list)
{
// All sections listed in the dyld image info structure will all
// either be fixed up already, or they will all be off by a single
// slide amount that is determined by finding the first segment
// that is at file offset zero which also has bytes (a file size
// that is greater than zero) in the object file.
// Determine the slide amount (if any)
info.slide = 0;
const size_t num_sections = section_list->GetSize();
size_t sect_idx = 0;
for (sect_idx = 0; sect_idx < num_sections; ++sect_idx)
{
// Iterate through the object file sections to find the
// first section that starts of file offset zero and that
// has bytes in the file...
Section *section = section_list->GetSectionAtIndex (sect_idx).get();
if (section)
{
// Find the first section that begins at file offset zero
// a file size (skip page zero).
if (section->GetFileOffset() == 0 && section->GetFileSize() > 0)
{
// We have now found the section, lets match it up
// with the section in the dyld image info structure.
const Segment *dyld_segment = info.FindSegment (section->GetName());
if (dyld_segment)
info.slide = info.address - dyld_segment->addr;
// We have found the slide amount, so we can exit
// this for loop.
break;
}
}
}
// We now know the slide amount, so go through all sections
// and update the load addresses with the correct values.
uint32_t num_segments = info.segments.size();
for (uint32_t i=0; i<num_segments; ++i)
{
SectionSP section_sp(section_list->FindSectionByName(info.segments[i].name));
assert (section_sp.get() != NULL);
const addr_t new_section_load_addr = info.segments[i].addr + info.slide;
const addr_t old_section_load_addr = m_process->GetTarget().GetSectionLoadList().GetSectionLoadAddress (section_sp.get());
if (old_section_load_addr == LLDB_INVALID_ADDRESS ||
old_section_load_addr != new_section_load_addr)
{
if (m_process->GetTarget().GetSectionLoadList().SetSectionLoadAddress (section_sp.get(), new_section_load_addr))
changed = true;
}
}
}
}
}
return changed;
}
//----------------------------------------------------------------------
// Update the load addresses for all segments in MODULE using the
// updated INFO that is passed in.
//----------------------------------------------------------------------
bool
DynamicLoaderMacOSXDYLD::UnloadImageLoadAddress (Module *module, struct DYLDImageInfo& info)
{
bool changed = false;
if (module)
{
ObjectFile *image_object_file = module->GetObjectFile();
if (image_object_file)
{
SectionList *section_list = image_object_file->GetSectionList ();
if (section_list)
{
uint32_t num_segments = info.segments.size();
for (uint32_t i=0; i<num_segments; ++i)
{
SectionSP section_sp(section_list->FindSectionByName(info.segments[i].name));
assert (section_sp.get() != NULL);
const addr_t old_section_load_addr = info.segments[i].addr + info.slide;
if (m_process->GetTarget().GetSectionLoadList().SetSectionUnloaded (section_sp.get(), old_section_load_addr))
changed = true;
}
}
}
}
return changed;
}
//----------------------------------------------------------------------
// Static callback function that gets called when our DYLD notification
// breakpoint gets hit. We update all of our image infos and then
// let our super class DynamicLoader class decide if we should stop
// or not (based on global preference).
//----------------------------------------------------------------------
bool
DynamicLoaderMacOSXDYLD::NotifyBreakpointHit (void *baton, StoppointCallbackContext *context, lldb::user_id_t break_id, lldb::user_id_t break_loc_id)
{
// Let the event know that the images have changed
DynamicLoaderMacOSXDYLD* dyld_instance = (DynamicLoaderMacOSXDYLD*) baton;
dyld_instance->UpdateAllImageInfos();
// Return true to stop the target, false to just let the target run
return dyld_instance->GetStopWhenImagesChange();
}
bool
DynamicLoaderMacOSXDYLD::ReadAllImageInfosStructure ()
{
Mutex::Locker locker(m_mutex);
// the all image infos is already valid for this process stop ID
if (m_process->GetStopID() == m_dyld_all_image_infos_stop_id)
return true;
m_dyld_all_image_infos.Clear();
if (m_dyld_all_image_infos_addr != LLDB_INVALID_ADDRESS)
{
ByteOrder byte_order = m_process->GetByteOrder();
uint32_t addr_size = 4;
if (m_dyld_all_image_infos_addr > UINT32_MAX)
addr_size = 8;
uint8_t buf[256];
DataExtractor data (buf, sizeof(buf), byte_order, addr_size);
uint32_t offset = 0;
const size_t count_v2 = sizeof (uint32_t) + // version
sizeof (uint32_t) + // infoArrayCount
addr_size + // infoArray
addr_size + // notification
addr_size + // processDetachedFromSharedRegion + libSystemInitialized + pad
addr_size; // dyldImageLoadAddress
const size_t count_v11 = count_v2 +
addr_size + // jitInfo
addr_size + // dyldVersion
addr_size + // errorMessage
addr_size + // terminationFlags
addr_size + // coreSymbolicationShmPage
addr_size + // systemOrderFlag
addr_size + // uuidArrayCount
addr_size + // uuidArray
addr_size + // dyldAllImageInfosAddress
addr_size + // initialImageCount
addr_size + // errorKind
addr_size + // errorClientOfDylibPath
addr_size + // errorTargetDylibPath
addr_size; // errorSymbol
assert (sizeof (buf) > count_v11);
int count;
Error error;
if (m_process->ReadMemory (m_dyld_all_image_infos_addr, buf, 4, error) == 4)
{
m_dyld_all_image_infos.version = data.GetU32(&offset);
// If anything in the high byte is set, we probably got the byte
// order incorrect (the process might not have it set correctly
// yet due to attaching to a program without a specified file).
if (m_dyld_all_image_infos.version & 0xff000000)
{
// We have guessed the wrong byte order. Swap it and try
// reading the version again.
if (byte_order == eByteOrderLittle)
byte_order = eByteOrderBig;
else
byte_order = eByteOrderLittle;
data.SetByteOrder (byte_order);
offset = 0;
m_dyld_all_image_infos.version = data.GetU32(&offset);
}
}
else
{
return false;
}
if (m_dyld_all_image_infos.version >= 11)
count = count_v11;
else
count = count_v2;
const size_t bytes_read = m_process->ReadMemory (m_dyld_all_image_infos_addr, buf, count, error);
if (bytes_read == count)
{
offset = 0;
m_dyld_all_image_infos.version = data.GetU32(&offset);
m_dyld_all_image_infos.dylib_info_count = data.GetU32(&offset);
m_dyld_all_image_infos.dylib_info_addr = data.GetPointer(&offset);
m_dyld_all_image_infos.notification = data.GetPointer(&offset);
m_dyld_all_image_infos.processDetachedFromSharedRegion = data.GetU8(&offset);
m_dyld_all_image_infos.libSystemInitialized = data.GetU8(&offset);
// Adjust for padding.
offset += addr_size - 2;
m_dyld_all_image_infos.dyldImageLoadAddress = data.GetPointer(&offset);
if (m_dyld_all_image_infos.version >= 11)
{
offset += addr_size * 8;
uint64_t dyld_all_image_infos_addr = data.GetPointer(&offset);
// When we started, we were given the actual address of the all_image_infos
// struct (probably via TASK_DYLD_INFO) in memory - this address is stored in
// m_dyld_all_image_infos_addr and is the most accurate address we have.
// We read the dyld_all_image_infos struct from memory; it contains its own address.
// If the address in the struct does not match the actual address,
// the dyld we're looking at has been loaded at a different location (slid) from
// where it intended to load. The addresses in the dyld_all_image_infos struct
// are the original, non-slid addresses, and need to be adjusted. Most importantly
// the address of dyld and the notification address need to be adjusted.
if (dyld_all_image_infos_addr != m_dyld_all_image_infos_addr)
{
uint64_t image_infos_offset = dyld_all_image_infos_addr - m_dyld_all_image_infos.dyldImageLoadAddress;
uint64_t notification_offset = m_dyld_all_image_infos.notification - m_dyld_all_image_infos.dyldImageLoadAddress;
m_dyld_all_image_infos.dyldImageLoadAddress = m_dyld_all_image_infos_addr - image_infos_offset;
m_dyld_all_image_infos.notification = m_dyld_all_image_infos.dyldImageLoadAddress + notification_offset;
}
}
m_dyld_all_image_infos_stop_id = m_process->GetStopID();
return true;
}
}
return false;
}
//----------------------------------------------------------------------
// If we have found where the "_dyld_all_image_infos" lives in memory,
// read the current info from it, and then update all image load
// addresses (or lack thereof).
//----------------------------------------------------------------------
uint32_t
DynamicLoaderMacOSXDYLD::UpdateAllImageInfos()
{
LogSP log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER));
if (ReadAllImageInfosStructure ())
{
Mutex::Locker locker(m_mutex);
if (m_process->GetStopID() == m_dyld_image_infos_stop_id)
m_dyld_image_infos.size();
uint32_t idx;
uint32_t i = 0;
DYLDImageInfo::collection old_dyld_all_image_infos;
old_dyld_all_image_infos.swap(m_dyld_image_infos);
// If we made it here, we are assuming that the all dylib info data should
// be valid, lets read the info array.
const ByteOrder endian = m_dyld.GetByteOrder();
const uint32_t addr_size = m_dyld.GetAddressByteSize();
if (m_dyld_all_image_infos.dylib_info_count > 0)
{
if (m_dyld_all_image_infos.dylib_info_addr == 0)
{
// DYLD is updating the images right now...
}
else
{
m_dyld_image_infos.resize(m_dyld_all_image_infos.dylib_info_count);
const size_t count = m_dyld_image_infos.size() * 3 * addr_size;
DataBufferHeap info_data(count, 0);
Error error;
const size_t bytes_read = m_process->ReadMemory (m_dyld_all_image_infos.dylib_info_addr,
info_data.GetBytes(),
info_data.GetByteSize(),
error);
if (bytes_read == count)
{
uint32_t info_data_offset = 0;
DataExtractor info_data_ref(info_data.GetBytes(), info_data.GetByteSize(), endian, addr_size);
for (i = 0; info_data_ref.ValidOffset(info_data_offset); i++)
{
assert (i < m_dyld_image_infos.size());
m_dyld_image_infos[i].address = info_data_ref.GetPointer(&info_data_offset);
lldb::addr_t path_addr = info_data_ref.GetPointer(&info_data_offset);
m_dyld_image_infos[i].mod_date = info_data_ref.GetPointer(&info_data_offset);
char raw_path[PATH_MAX];
m_process->ReadMemory (path_addr, raw_path, sizeof(raw_path), error);
m_dyld_image_infos[i].file_spec.SetFile(raw_path, true);
}
assert(i == m_dyld_all_image_infos.dylib_info_count);
UpdateAllImageInfosHeaderAndLoadCommands();
}
else
{
DEBUG_PRINTF( "unable to read all data for all_dylib_infos.");
m_dyld_image_infos.clear();
}
}
}
else
{
m_dyld_image_infos.clear();
}
// If our new list is smaller than our old list, we have unloaded
// some shared libraries
if (m_dyld_image_infos.size() != old_dyld_all_image_infos.size())
{
ModuleList unloaded_module_list;
if (old_dyld_all_image_infos.size() == 0)
{
// This is the first time we are loading shared libraries,
// we need to make sure to trim anything that isn't in the
// m_dyld_image_infos out of the target module list since
// we might have shared libraries that got loaded from
// elsewhere due to DYLD_FRAMEWORK_PATH, or DYLD_LIBRARY_PATH
// environment variables...
ModuleList& images = m_process->GetTarget().GetImages();
const size_t num_images = images.GetSize();
for (idx = 0; idx < num_images; ++idx)
{
ModuleSP module_sp (images.GetModuleAtIndex (idx));
if (GetImageInfo (module_sp->GetFileSpec(), module_sp->GetUUID()) == NULL)
unloaded_module_list.AppendIfNeeded (module_sp);
}
}
else
{
uint32_t old_idx;
for (idx = 0; idx < old_dyld_all_image_infos.size(); ++idx)
{
for (old_idx = idx; old_idx < old_dyld_all_image_infos.size(); ++old_idx)
{
if (m_dyld_image_infos[idx].file_spec == old_dyld_all_image_infos[old_idx].file_spec)
{
old_dyld_all_image_infos[old_idx].address = LLDB_INVALID_ADDRESS;
break;
}
}
}
for (old_idx = 0; old_idx < old_dyld_all_image_infos.size(); ++old_idx)
{
if (old_dyld_all_image_infos[old_idx].address != LLDB_INVALID_ADDRESS)
{
if (log)
old_dyld_all_image_infos[old_idx].PutToLog (log.get());
ModuleSP unload_image_module_sp(m_process->GetTarget().GetImages().FindFirstModuleForFileSpec (old_dyld_all_image_infos[old_idx].file_spec));
if (unload_image_module_sp.get())
{
if (UnloadImageLoadAddress (unload_image_module_sp.get(), old_dyld_all_image_infos[old_idx]))
unloaded_module_list.AppendIfNeeded (unload_image_module_sp);
}
}
}
}
if (unloaded_module_list.GetSize() > 0)
{
if (log)
{
log->PutCString("Unloaded:");
unloaded_module_list.LogUUIDAndPaths (log, "DynamicLoaderMacOSXDYLD::ModulesDidUnload");
}
m_process->GetTarget().ModulesDidUnload (unloaded_module_list);
}
}
else
{
if (log)
PutToLog(log.get());
}
m_dyld_image_infos_stop_id = m_process->GetStopID();
}
else
{
m_dyld_image_infos.clear();
}
const uint32_t num_dylibs = m_dyld_image_infos.size();
if (num_dylibs > 0)
{
ModuleList loaded_module_list;
for (uint32_t idx = 0; idx<num_dylibs; ++idx)
{
ArchSpec arch_spec(eArchTypeMachO, m_dyld_image_infos[idx].header.cputype, m_dyld_image_infos[idx].header.cpusubtype);
ModuleSP image_module_sp(m_process->GetTarget().GetImages().FindFirstModuleForFileSpec (m_dyld_image_infos[idx].file_spec));
if (image_module_sp.get() == NULL || image_module_sp->GetArchitecture() != arch_spec)
{
image_module_sp = m_process->GetTarget().GetSharedModule (m_dyld_image_infos[idx].file_spec,
arch_spec,
&m_dyld_image_infos[idx].uuid);
}
if (image_module_sp)
{
if (m_dyld_image_infos[idx].header.filetype == HeaderFileTypeDynamicLinkEditor)
image_module_sp->SetIsDynamicLinkEditor (true);
ObjectFile *objfile = image_module_sp->GetObjectFile ();
if (objfile)
{
SectionList *sections = objfile->GetSectionList();
if (sections)
{
ConstString commpage_dbstr("__commpage");
Section *commpage_section = sections->FindSectionByName(commpage_dbstr).get();
if (commpage_section)
{
FileSpec objfile_file_spec(objfile->GetFileSpec());
ModuleSP commpage_image_module_sp(m_process->GetTarget().GetImages().FindFirstModuleForFileSpec (objfile_file_spec, &commpage_dbstr));
if (commpage_image_module_sp.get() == NULL)
{
commpage_image_module_sp = m_process->GetTarget().GetSharedModule (m_dyld_image_infos[idx].file_spec,
arch_spec,
&m_dyld_image_infos[idx].uuid,
&commpage_dbstr,
objfile->GetOffset() + commpage_section->GetOffset());
UpdateCommPageLoadAddress(commpage_image_module_sp.get());
}
}
}
}
// UpdateImageLoadAddress will return true if any segments
// change load address. We need to check this so we don't
// mention that all loaded shared libraries are newly loaded
// each time we hit out dyld breakpoint since dyld will list all
// shared libraries each time.
if (UpdateImageLoadAddress (image_module_sp.get(), m_dyld_image_infos[idx]))
{
loaded_module_list.AppendIfNeeded (image_module_sp);
}
}
}
if (loaded_module_list.GetSize() > 0)
{
// FIXME: This should really be in the Runtime handlers class, which should get
// called by the target's ModulesDidLoad, but we're doing it all locally for now
// to save time.
// Also, I'm assuming there can be only one libobjc dylib loaded...
ObjCLanguageRuntime *objc_runtime = m_process->GetObjCLanguageRuntime();
if (objc_runtime != NULL && !objc_runtime->HasReadObjCLibrary())
{
size_t num_modules = loaded_module_list.GetSize();
for (int i = 0; i < num_modules; i++)
{
if (objc_runtime->IsModuleObjCLibrary (loaded_module_list.GetModuleAtIndex (i)))
{
objc_runtime->ReadObjCLibrary (loaded_module_list.GetModuleAtIndex (i));
break;
}
}
}
if (log)
loaded_module_list.LogUUIDAndPaths (log, "DynamicLoaderMacOSXDYLD::ModulesDidLoad");
m_process->GetTarget().ModulesDidLoad (loaded_module_list);
}
}
return m_dyld_image_infos.size();
}
//----------------------------------------------------------------------
// Read a mach_header at ADDR into HEADER, and also fill in the load
// command data into LOAD_COMMAND_DATA if it is non-NULL.
//
// Returns true if we succeed, false if we fail for any reason.
//----------------------------------------------------------------------
bool
DynamicLoaderMacOSXDYLD::ReadMachHeader (lldb::addr_t addr, mach_header *header, DataExtractor *load_command_data)
{
DataBufferHeap header_bytes(sizeof(mach_header), 0);
Error error;
size_t bytes_read = m_process->ReadMemory (addr,
header_bytes.GetBytes(),
header_bytes.GetByteSize(),
error);
if (bytes_read == sizeof(mach_header))
{
uint32_t offset = 0;
::memset (header, 0, sizeof(header));
// Get the magic byte unswapped so we can figure out what we are dealing with
DataExtractor data(header_bytes.GetBytes(), header_bytes.GetByteSize(), eByteOrderHost, 4);
header->magic = data.GetU32(&offset);
lldb::addr_t load_cmd_addr = addr;
data.SetByteOrder(DynamicLoaderMacOSXDYLD::GetByteOrderFromMagic(header->magic));
switch (header->magic)
{
case llvm::MachO::HeaderMagic32:
case llvm::MachO::HeaderMagic32Swapped:
data.SetAddressByteSize(4);
load_cmd_addr += sizeof(mach_header);
break;
case llvm::MachO::HeaderMagic64:
case llvm::MachO::HeaderMagic64Swapped:
data.SetAddressByteSize(8);
load_cmd_addr += sizeof(mach_header_64);
break;
default:
return false;
}
// Read the rest of dyld's mach header
if (data.GetU32(&offset, &header->cputype, (sizeof(mach_header)/sizeof(uint32_t)) - 1))
{
if (load_command_data == NULL)
return true; // We were able to read the mach_header and weren't asked to read the load command bytes
DataBufferSP load_cmd_data_sp(new DataBufferHeap(header->sizeofcmds, 0));
size_t load_cmd_bytes_read = m_process->ReadMemory (load_cmd_addr,
load_cmd_data_sp->GetBytes(),
load_cmd_data_sp->GetByteSize(),
error);
if (load_cmd_bytes_read == header->sizeofcmds)
{
// Set the load command data and also set the correct endian
// swap settings and the correct address size
load_command_data->SetData(load_cmd_data_sp, 0, header->sizeofcmds);
load_command_data->SetByteOrder(data.GetByteOrder());
load_command_data->SetAddressByteSize(data.GetAddressByteSize());
return true; // We successfully read the mach_header and the load command data
}
return false; // We weren't able to read the load command data
}
}
return false; // We failed the read the mach_header
}
//----------------------------------------------------------------------
// Parse the load commands for an image
//----------------------------------------------------------------------
uint32_t
DynamicLoaderMacOSXDYLD::ParseLoadCommands (const DataExtractor& data, struct DYLDImageInfo& dylib_info, FileSpec *lc_id_dylinker)
{
uint32_t offset = 0;
uint32_t cmd_idx;
Segment segment;
dylib_info.Clear (true);
for (cmd_idx = 0; cmd_idx < dylib_info.header.ncmds; cmd_idx++)
{
// Clear out any load command specific data from DYLIB_INFO since
// we are about to read it.
if (data.ValidOffsetForDataOfSize (offset, sizeof(load_command)))
{
load_command load_cmd;
uint32_t load_cmd_offset = offset;
load_cmd.cmd = data.GetU32 (&offset);
load_cmd.cmdsize = data.GetU32 (&offset);
switch (load_cmd.cmd)
{
case LoadCommandSegment32:
{
segment.name.SetTrimmedCStringWithLength ((const char *)data.GetData(&offset, 16), 16);
segment.addr = data.GetU32 (&offset);
segment.size = data.GetU32 (&offset);
dylib_info.segments.push_back (segment);
}
break;
case LoadCommandSegment64:
{
segment.name.SetTrimmedCStringWithLength ((const char *)data.GetData(&offset, 16), 16);
segment.addr = data.GetU64 (&offset);
segment.size = data.GetU64 (&offset);
dylib_info.segments.push_back (segment);
}
break;
case LoadCommandDynamicLinkerIdent:
if (lc_id_dylinker)
{
uint32_t name_offset = load_cmd_offset + data.GetU32 (&offset);
const char *path = data.PeekCStr (name_offset);
lc_id_dylinker->SetFile (path, true);
}
break;
case LoadCommandUUID:
dylib_info.uuid.SetBytes(data.GetData (&offset, 16));
break;
default:
break;
}
// Set offset to be the beginning of the next load command.
offset = load_cmd_offset + load_cmd.cmdsize;
}
}
return cmd_idx;
}
//----------------------------------------------------------------------
// Read the mach_header and load commands for each image that the
// _dyld_all_image_infos structure points to and cache the results.
//----------------------------------------------------------------------
void
DynamicLoaderMacOSXDYLD::UpdateAllImageInfosHeaderAndLoadCommands()
{
uint32_t exe_idx = UINT32_MAX;
// Read any UUID values that we can get
for (uint32_t i = 0; i < m_dyld_all_image_infos.dylib_info_count; i++)
{
if (!m_dyld_image_infos[i].UUIDValid())
{
DataExtractor data; // Load command data
if (!ReadMachHeader (m_dyld_image_infos[i].address, &m_dyld_image_infos[i].header, &data))
continue;
ParseLoadCommands (data, m_dyld_image_infos[i], NULL);
if (m_dyld_image_infos[i].header.filetype == HeaderFileTypeExecutable)
exe_idx = i;
}
}
if (exe_idx < m_dyld_image_infos.size())
{
bool set_executable = false;
ArchSpec dyld_exe_arch_spec(eArchTypeMachO, m_dyld_image_infos[exe_idx].header.cputype, m_dyld_image_infos[exe_idx].header.cpusubtype);
ModuleSP exe_module_sp(m_process->GetTarget().GetExecutableModule());
if (exe_module_sp.get())
{
if (exe_module_sp->GetFileSpec() != m_dyld_image_infos[exe_idx].file_spec ||
exe_module_sp->GetArchitecture() != dyld_exe_arch_spec)
set_executable = true;
}
else
set_executable = true;
if (set_executable)
{
exe_module_sp = m_process->GetTarget().GetSharedModule (m_dyld_image_infos[exe_idx].file_spec,
dyld_exe_arch_spec,
&m_dyld_image_infos[exe_idx].uuid);
if (exe_module_sp.get())
{
// If we found the file where it purported to be, then it should
// be safe to load dependent images.
bool get_dependent_images = exe_module_sp->GetFileSpec() == m_dyld_image_infos[exe_idx].file_spec;
m_process->GetTarget().SetExecutableModule (exe_module_sp, get_dependent_images);
}
}
}
}
//----------------------------------------------------------------------
// Dump a Segment to the file handle provided.
//----------------------------------------------------------------------
void
DynamicLoaderMacOSXDYLD::Segment::PutToLog (Log *log, lldb::addr_t slide) const
{
if (log)
log->Printf("\t\t%16s [0x%16.16llx - 0x%16.16llx)", name.AsCString(""), addr + slide, addr + slide + size);
}
const DynamicLoaderMacOSXDYLD::Segment *
DynamicLoaderMacOSXDYLD::DYLDImageInfo::FindSegment (const ConstString &name) const
{
const size_t num_segments = segments.size();
for (size_t i=0; i<num_segments; ++i)
{
if (segments[i].name == name)
return &segments[i];
}
return NULL;
}
//----------------------------------------------------------------------
// Dump an image info structure to the file handle provided.
//----------------------------------------------------------------------
void
DynamicLoaderMacOSXDYLD::DYLDImageInfo::PutToLog (Log *log) const
{
if (log == NULL)
return;
uint8_t *u = (uint8_t *)uuid.GetBytes();
if (address == LLDB_INVALID_ADDRESS)
{
if (u)
{
log->Printf("\t modtime=0x%8.8llx uuid=%2.2X%2.2X%2.2X%2.2X-%2.2X%2.2X-%2.2X%2.2X-%2.2X%2.2X-%2.2X%2.2X%2.2X%2.2X%2.2X%2.2X path='%s/%s' (UNLOADED)",
mod_date,
u[ 0], u[ 1], u[ 2], u[ 3],
u[ 4], u[ 5], u[ 6], u[ 7],
u[ 8], u[ 9], u[10], u[11],
u[12], u[13], u[14], u[15],
file_spec.GetDirectory().AsCString(),
file_spec.GetFilename().AsCString());
}
else
log->Printf("\t modtime=0x%8.8llx path='%s/%s' (UNLOADED)",
mod_date,
file_spec.GetDirectory().AsCString(),
file_spec.GetFilename().AsCString());
}
else
{
if (u)
{
log->Printf("\taddress=0x%16.16llx modtime=0x%8.8llx uuid=%2.2X%2.2X%2.2X%2.2X-%2.2X%2.2X-%2.2X%2.2X-%2.2X%2.2X-%2.2X%2.2X%2.2X%2.2X%2.2X%2.2X path='%s/%s'",
address,
mod_date,
u[ 0], u[ 1], u[ 2], u[ 3],
u[ 4], u[ 5], u[ 6], u[ 7],
u[ 8], u[ 9], u[10], u[11],
u[12], u[13], u[14], u[15],
file_spec.GetDirectory().AsCString(),
file_spec.GetFilename().AsCString());
}
else
{
log->Printf("\taddress=0x%16.16llx modtime=0x%8.8llx path='%s/%s'",
address,
mod_date,
file_spec.GetDirectory().AsCString(),
file_spec.GetFilename().AsCString());
}
for (uint32_t i=0; i<segments.size(); ++i)
segments[i].PutToLog(log, slide);
}
}
//----------------------------------------------------------------------
// Dump the _dyld_all_image_infos members and all current image infos
// that we have parsed to the file handle provided.
//----------------------------------------------------------------------
void
DynamicLoaderMacOSXDYLD::PutToLog(Log *log) const
{
if (log == NULL)
return;
Mutex::Locker locker(m_mutex);
log->Printf("dyld_all_image_infos = { version=%d, count=%d, addr=0x%8.8llx, notify=0x%8.8llx }",
m_dyld_all_image_infos.version,
m_dyld_all_image_infos.dylib_info_count,
(uint64_t)m_dyld_all_image_infos.dylib_info_addr,
(uint64_t)m_dyld_all_image_infos.notification);
size_t i;
const size_t count = m_dyld_image_infos.size();
if (count > 0)
{
log->PutCString("Loaded:");
for (i = 0; i<count; i++)
m_dyld_image_infos[i].PutToLog(log);
}
}
void
DynamicLoaderMacOSXDYLD::PrivateInitialize(Process *process)
{
DEBUG_PRINTF("DynamicLoaderMacOSXDYLD::%s() process state = %s\n", __FUNCTION__, StateAsCString(m_process->GetState()));
Clear(true);
m_process = process;
m_process->GetTarget().GetSectionLoadList().Clear();
}
bool
DynamicLoaderMacOSXDYLD::SetNotificationBreakpoint ()
{
DEBUG_PRINTF("DynamicLoaderMacOSXDYLD::%s() process state = %s\n", __FUNCTION__, StateAsCString(m_process->GetState()));
if (m_break_id == LLDB_INVALID_BREAK_ID)
{
if (m_dyld_all_image_infos.notification != LLDB_INVALID_ADDRESS)
{
Address so_addr;
// Set the notification breakpoint and install a breakpoint
// callback function that will get called each time the
// breakpoint gets hit. We will use this to track when shared
// libraries get loaded/unloaded.
if (m_process->GetTarget().GetSectionLoadList().ResolveLoadAddress(m_dyld_all_image_infos.notification, so_addr))
{
Breakpoint *dyld_break = m_process->GetTarget().CreateBreakpoint (so_addr, true).get();
dyld_break->SetCallback (DynamicLoaderMacOSXDYLD::NotifyBreakpointHit, this, true);
m_break_id = dyld_break->GetID();
}
}
}
return m_break_id != LLDB_INVALID_BREAK_ID;
}
//----------------------------------------------------------------------
// Member function that gets called when the process state changes.
//----------------------------------------------------------------------
void
DynamicLoaderMacOSXDYLD::PrivateProcessStateChanged (Process *process, StateType state)
{
DEBUG_PRINTF("DynamicLoaderMacOSXDYLD::%s(%s)\n", __FUNCTION__, StateAsCString(state));
switch (state)
{
case eStateAttaching:
case eStateLaunching:
case eStateInvalid:
case eStateUnloaded:
case eStateExited:
case eStateDetached:
Clear(false);
break;
case eStateStopped:
// Keep trying find dyld and set our notification breakpoint each time
// we stop until we succeed
if (!DidSetNotificationBreakpoint () && m_process->IsAlive())
{
if (NeedToLocateDYLD ())
LocateDYLD ();
SetNotificationBreakpoint ();
}
break;
case eStateRunning:
case eStateStepping:
case eStateCrashed:
case eStateSuspended:
break;
default:
break;
}
}
ThreadPlanSP
DynamicLoaderMacOSXDYLD::GetStepThroughTrampolinePlan (Thread &thread, bool stop_others)
{
ThreadPlanSP thread_plan_sp;
StackFrame *current_frame = thread.GetStackFrameAtIndex(0).get();
const SymbolContext &current_context = current_frame->GetSymbolContext(eSymbolContextSymbol);
Symbol *current_symbol = current_context.symbol;
LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
if (current_symbol != NULL)
{
if (current_symbol->IsTrampoline())
{
const ConstString &trampoline_name = current_symbol->GetMangled().GetName(Mangled::ePreferMangled);
if (trampoline_name)
{
SymbolContextList target_symbols;
ModuleList &images = thread.GetProcess().GetTarget().GetImages();
images.FindSymbolsWithNameAndType(trampoline_name, eSymbolTypeCode, target_symbols);
// FIXME - Make the Run to Address take multiple addresses, and
// run to any of them.
uint32_t num_symbols = target_symbols.GetSize();
if (num_symbols == 1)
{
SymbolContext context;
AddressRange addr_range;
if (target_symbols.GetContextAtIndex(0, context))
{
context.GetAddressRange (eSymbolContextEverything, addr_range);
thread_plan_sp.reset (new ThreadPlanRunToAddress (thread, addr_range.GetBaseAddress(), stop_others));
}
else
{
if (log)
log->Printf ("Couldn't resolve the symbol context.");
}
}
else if (num_symbols > 1)
{
std::vector<lldb::addr_t> addresses;
addresses.resize (num_symbols);
for (uint32_t i = 0; i < num_symbols; i++)
{
SymbolContext context;
AddressRange addr_range;
if (target_symbols.GetContextAtIndex(i, context))
{
context.GetAddressRange (eSymbolContextEverything, addr_range);
lldb::addr_t load_addr = addr_range.GetBaseAddress().GetLoadAddress(&thread.GetProcess().GetTarget());
addresses[i] = load_addr;
}
}
if (addresses.size() > 0)
thread_plan_sp.reset (new ThreadPlanRunToAddress (thread, addresses, stop_others));
else
{
if (log)
log->Printf ("Couldn't resolve the symbol contexts.");
}
}
else
{
if (log)
{
log->Printf ("Could not find symbol for trampoline target: \"%s\"", trampoline_name.AsCString());
}
}
}
}
}
else
{
if (log)
log->Printf ("Could not find symbol for step through.");
}
return thread_plan_sp;
}
Error
DynamicLoaderMacOSXDYLD::CanLoadImage ()
{
Error error;
// In order for us to tell if we can load a shared library we verify that
// the dylib_info_addr isn't zero (which means no shared libraries have
// been set yet, or dyld is currently mucking with the shared library list).
if (ReadAllImageInfosStructure ())
{
// TODO: also check the _dyld_global_lock_held variable in libSystem.B.dylib?
// TODO: check the malloc lock?
// TODO: check the objective C lock?
if (m_dyld_all_image_infos.dylib_info_addr != 0)
return error; // Success
}
error.SetErrorString("unsafe to load or unload shared libraries");
return error;
}
void
DynamicLoaderMacOSXDYLD::Initialize()
{
PluginManager::RegisterPlugin (GetPluginNameStatic(),
GetPluginDescriptionStatic(),
CreateInstance);
}
void
DynamicLoaderMacOSXDYLD::Terminate()
{
PluginManager::UnregisterPlugin (CreateInstance);
}
const char *
DynamicLoaderMacOSXDYLD::GetPluginNameStatic()
{
return "dynamic-loader.macosx-dyld";
}
const char *
DynamicLoaderMacOSXDYLD::GetPluginDescriptionStatic()
{
return "Dynamic loader plug-in that watches for shared library loads/unloads in MacOSX user processes.";
}
//------------------------------------------------------------------
// PluginInterface protocol
//------------------------------------------------------------------
const char *
DynamicLoaderMacOSXDYLD::GetPluginName()
{
return "DynamicLoaderMacOSXDYLD";
}
const char *
DynamicLoaderMacOSXDYLD::GetShortPluginName()
{
return GetPluginNameStatic();
}
uint32_t
DynamicLoaderMacOSXDYLD::GetPluginVersion()
{
return 1;
}
void
DynamicLoaderMacOSXDYLD::GetPluginCommandHelp (const char *command, Stream *strm)
{
}
Error
DynamicLoaderMacOSXDYLD::ExecutePluginCommand (Args &command, Stream *strm)
{
Error error;
error.SetErrorString("No plug-in command are currently supported.");
return error;
}
Log *
DynamicLoaderMacOSXDYLD::EnablePluginLogging (Stream *strm, Args &command)
{
return NULL;
}
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