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//===-- DynamicLoader.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-private.h"
#include "lldb/Target/DynamicLoader.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Target.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/Section.h"
using namespace lldb;
using namespace lldb_private;
DynamicLoader*
DynamicLoader::FindPlugin (Process *process, const char *plugin_name)
{
DynamicLoaderCreateInstance create_callback = NULL;
if (plugin_name)
{
ConstString const_plugin_name(plugin_name);
create_callback = PluginManager::GetDynamicLoaderCreateCallbackForPluginName (const_plugin_name);
if (create_callback)
{
std::unique_ptr<DynamicLoader> instance_ap(create_callback(process, true));
if (instance_ap.get())
return instance_ap.release();
}
}
else
{
for (uint32_t idx = 0; (create_callback = PluginManager::GetDynamicLoaderCreateCallbackAtIndex(idx)) != NULL; ++idx)
{
std::unique_ptr<DynamicLoader> instance_ap(create_callback(process, false));
if (instance_ap.get())
return instance_ap.release();
}
}
return NULL;
}
//----------------------------------------------------------------------
// DynamicLoader constructor
//----------------------------------------------------------------------
DynamicLoader::DynamicLoader(Process *process) :
m_process (process)
{
}
//----------------------------------------------------------------------
// Destructor
//----------------------------------------------------------------------
DynamicLoader::~DynamicLoader()
{
}
//----------------------------------------------------------------------
// Accessosors to the global setting as to whether to stop at image
// (shared library) loading/unloading.
//----------------------------------------------------------------------
bool
DynamicLoader::GetStopWhenImagesChange () const
{
return m_process->GetStopOnSharedLibraryEvents();
}
void
DynamicLoader::SetStopWhenImagesChange (bool stop)
{
m_process->SetStopOnSharedLibraryEvents (stop);
}
ModuleSP
DynamicLoader::GetTargetExecutable()
{
Target &target = m_process->GetTarget();
ModuleSP executable = target.GetExecutableModule();
if (executable.get())
{
if (executable->GetFileSpec().Exists())
{
ModuleSpec module_spec (executable->GetFileSpec(), executable->GetArchitecture());
ModuleSP module_sp (new Module (module_spec));
// Check if the executable has changed and set it to the target executable if they differ.
if (module_sp.get() && module_sp->GetUUID().IsValid() && executable->GetUUID().IsValid())
{
if (module_sp->GetUUID() != executable->GetUUID())
executable.reset();
}
else if (executable->FileHasChanged())
{
executable.reset();
}
if (!executable.get())
{
executable = target.GetSharedModule(module_spec);
if (executable.get() != target.GetExecutableModulePointer())
{
// Don't load dependent images since we are in dyld where we will know
// and find out about all images that are loaded
const bool get_dependent_images = false;
target.SetExecutableModule(executable, get_dependent_images);
}
}
}
}
return executable;
}
void
DynamicLoader::UpdateLoadedSections(ModuleSP module, addr_t link_map_addr, addr_t base_addr)
{
UpdateLoadedSectionsCommon(module, base_addr);
}
void
DynamicLoader::UpdateLoadedSectionsCommon(ModuleSP module, addr_t base_addr)
{
bool changed;
const bool base_addr_is_offset = true;
module->SetLoadAddress(m_process->GetTarget(), base_addr, base_addr_is_offset, changed);
}
void
DynamicLoader::UnloadSections(const ModuleSP module)
{
UnloadSectionsCommon(module);
}
void
DynamicLoader::UnloadSectionsCommon(const ModuleSP module)
{
Target &target = m_process->GetTarget();
const SectionList *sections = GetSectionListFromModule(module);
assert(sections && "SectionList missing from unloaded module.");
const size_t num_sections = sections->GetSize();
for (size_t i = 0; i < num_sections; ++i)
{
SectionSP section_sp (sections->GetSectionAtIndex(i));
target.SetSectionUnloaded(section_sp);
}
}
const SectionList *
DynamicLoader::GetSectionListFromModule(const ModuleSP module) const
{
SectionList *sections = nullptr;
if (module.get())
{
ObjectFile *obj_file = module->GetObjectFile();
if (obj_file)
{
sections = obj_file->GetSectionList();
}
}
return sections;
}
ModuleSP
DynamicLoader::LoadModuleAtAddress(const FileSpec &file, addr_t link_map_addr, addr_t base_addr)
{
Target &target = m_process->GetTarget();
ModuleList &modules = target.GetImages();
ModuleSP module_sp;
ModuleSpec module_spec (file, target.GetArchitecture());
if ((module_sp = modules.FindFirstModule (module_spec)))
{
UpdateLoadedSections(module_sp, link_map_addr, base_addr);
}
else if ((module_sp = target.GetSharedModule(module_spec)))
{
UpdateLoadedSections(module_sp, link_map_addr, base_addr);
}
else
{
// Try to fetch the load address of the file from the process. It can be different from the
// address reported by the linker in case of a file with fixed load address because the
// linker reports the bias between the load address specified in the file and the actual
// load address it loaded the file.
bool is_loaded;
lldb::addr_t load_addr;
Error error = m_process->GetFileLoadAddress(file, is_loaded, load_addr);
if (error.Fail() || !is_loaded)
load_addr = base_addr;
if ((module_sp = m_process->ReadModuleFromMemory(file, load_addr)))
{
UpdateLoadedSections(module_sp, link_map_addr, base_addr);
target.GetImages().AppendIfNeeded(module_sp);
}
}
return module_sp;
}
int64_t
DynamicLoader::ReadUnsignedIntWithSizeInBytes(addr_t addr, int size_in_bytes)
{
Error error;
uint64_t value = m_process->ReadUnsignedIntegerFromMemory(addr, size_in_bytes, 0, error);
if (error.Fail())
return -1;
else
return (int64_t)value;
}
addr_t
DynamicLoader::ReadPointer(addr_t addr)
{
Error error;
addr_t value = m_process->ReadPointerFromMemory(addr, error);
if (error.Fail())
return LLDB_INVALID_ADDRESS;
else
return value;
}
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