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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/Target/DynamicLoader.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ModuleList.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/Section.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Target/MemoryRegionInfo.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Target.h"
#include "lldb/Utility/ConstString.h"
#include "lldb/lldb-private-interfaces.h"
#include "llvm/ADT/StringRef.h"
#include <memory>
#include <assert.h>
using namespace lldb;
using namespace lldb_private;
DynamicLoader *DynamicLoader::FindPlugin(Process *process,
const char *plugin_name) {
DynamicLoaderCreateInstance create_callback = nullptr;
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)
return instance_ap.release();
}
} else {
for (uint32_t idx = 0;
(create_callback =
PluginManager::GetDynamicLoaderCreateCallbackAtIndex(idx)) !=
nullptr;
++idx) {
std::unique_ptr<DynamicLoader> instance_ap(
create_callback(process, false));
if (instance_ap)
return instance_ap.release();
}
}
return nullptr;
}
DynamicLoader::DynamicLoader(Process *process) : m_process(process) {}
DynamicLoader::~DynamicLoader() = default;
//----------------------------------------------------------------------
// 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) {
if (FileSystem::Instance().Exists(executable->GetFileSpec())) {
ModuleSpec module_spec(executable->GetFileSpec(),
executable->GetArchitecture());
auto module_sp = std::make_shared<Module>(module_spec);
// Check if the executable has changed and set it to the target
// executable if they differ.
if (module_sp && module_sp->GetUUID().IsValid() &&
executable->GetUUID().IsValid()) {
if (module_sp->GetUUID() != executable->GetUUID())
executable.reset();
} else if (executable->FileHasChanged()) {
executable.reset();
}
if (!executable) {
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
target.SetExecutableModule(executable, eLoadDependentsNo);
}
}
}
}
return executable;
}
void DynamicLoader::UpdateLoadedSections(ModuleSP module, addr_t link_map_addr,
addr_t base_addr,
bool base_addr_is_offset) {
UpdateLoadedSectionsCommon(module, base_addr, base_addr_is_offset);
}
void DynamicLoader::UpdateLoadedSectionsCommon(ModuleSP module,
addr_t base_addr,
bool base_addr_is_offset) {
bool changed;
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) {
ObjectFile *obj_file = module->GetObjectFile();
if (obj_file != nullptr) {
sections = obj_file->GetSectionList();
}
}
return sections;
}
ModuleSP DynamicLoader::LoadModuleAtAddress(const FileSpec &file,
addr_t link_map_addr,
addr_t base_addr,
bool base_addr_is_offset) {
Target &target = m_process->GetTarget();
ModuleList &modules = target.GetImages();
ModuleSpec module_spec(file, target.GetArchitecture());
ModuleSP module_sp;
if ((module_sp = modules.FindFirstModule(module_spec))) {
UpdateLoadedSections(module_sp, link_map_addr, base_addr,
base_addr_is_offset);
return module_sp;
}
if ((module_sp = target.GetSharedModule(module_spec))) {
UpdateLoadedSections(module_sp, link_map_addr, base_addr,
base_addr_is_offset);
return module_sp;
}
bool check_alternative_file_name = true;
if (base_addr_is_offset) {
// Try to fetch the load address of the file from the process as we need
// absolute load address to read the file out of the memory instead of a
// load bias.
bool is_loaded = false;
lldb::addr_t load_addr;
Status error = m_process->GetFileLoadAddress(file, is_loaded, load_addr);
if (error.Success() && is_loaded) {
check_alternative_file_name = false;
base_addr = load_addr;
}
}
// We failed to find the module based on its name. Lets try to check if we
// can find a different name based on the memory region info.
if (check_alternative_file_name) {
MemoryRegionInfo memory_info;
Status error = m_process->GetMemoryRegionInfo(base_addr, memory_info);
if (error.Success() && memory_info.GetMapped() &&
memory_info.GetRange().GetRangeBase() == base_addr &&
!(memory_info.GetName().IsEmpty())) {
ModuleSpec new_module_spec(FileSpec(memory_info.GetName().AsCString()),
target.GetArchitecture());
if ((module_sp = modules.FindFirstModule(new_module_spec))) {
UpdateLoadedSections(module_sp, link_map_addr, base_addr, false);
return module_sp;
}
if ((module_sp = target.GetSharedModule(new_module_spec))) {
UpdateLoadedSections(module_sp, link_map_addr, base_addr, false);
return module_sp;
}
}
}
if ((module_sp = m_process->ReadModuleFromMemory(file, base_addr))) {
UpdateLoadedSections(module_sp, link_map_addr, base_addr, false);
target.GetImages().AppendIfNeeded(module_sp);
}
return module_sp;
}
int64_t DynamicLoader::ReadUnsignedIntWithSizeInBytes(addr_t addr,
int size_in_bytes) {
Status 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) {
Status error;
addr_t value = m_process->ReadPointerFromMemory(addr, error);
if (error.Fail())
return LLDB_INVALID_ADDRESS;
else
return value;
}
void DynamicLoader::LoadOperatingSystemPlugin(bool flush)
{
if (m_process)
m_process->LoadOperatingSystemPlugin(flush);
}
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