c4fb7180cb
Lots of code around LLDB was directly accessing the target's section load list. This NFC patch makes the section load list private so the Target class can access it, but everyone else now uses accessor functions. This allows us to control the resolving of addresses and will allow for functionality in LLDB which can lazily resolve addresses in JIT plug-ins with a future patch.
150 lines
5.0 KiB
C++
150 lines
5.0 KiB
C++
//===-- DynamicLoaderStatic.cpp -------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Core/Module.h"
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#include "lldb/Core/PluginManager.h"
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#include "lldb/Core/Section.h"
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#include "lldb/Symbol/ObjectFile.h"
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#include "lldb/Target/SectionLoadList.h"
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#include "lldb/Target/Target.h"
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#include "DynamicLoaderStatic.h"
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using namespace lldb;
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using namespace lldb_private;
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LLDB_PLUGIN_DEFINE(DynamicLoaderStatic)
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// Create an instance of this class. This function is filled into the plugin
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// info class that gets handed out by the plugin factory and allows the lldb to
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// instantiate an instance of this class.
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DynamicLoader *DynamicLoaderStatic::CreateInstance(Process *process,
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bool force) {
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bool create = force;
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if (!create) {
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const llvm::Triple &triple_ref =
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process->GetTarget().GetArchitecture().GetTriple();
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const llvm::Triple::OSType os_type = triple_ref.getOS();
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const llvm::Triple::ArchType arch_type = triple_ref.getArch();
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if (os_type == llvm::Triple::UnknownOS) {
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// The WASM and Hexagon plugin check the ArchType rather than the OSType,
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// so explicitly reject those here.
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switch(arch_type) {
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case llvm::Triple::hexagon:
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case llvm::Triple::wasm32:
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case llvm::Triple::wasm64:
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break;
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default:
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create = true;
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}
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}
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}
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if (!create) {
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Module *exe_module = process->GetTarget().GetExecutableModulePointer();
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if (exe_module) {
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ObjectFile *object_file = exe_module->GetObjectFile();
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if (object_file) {
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create = (object_file->GetStrata() == ObjectFile::eStrataRawImage);
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}
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}
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}
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if (create)
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return new DynamicLoaderStatic(process);
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return nullptr;
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}
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// Constructor
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DynamicLoaderStatic::DynamicLoaderStatic(Process *process)
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: DynamicLoader(process) {}
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/// Called after attaching a process.
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///
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/// Allow DynamicLoader plug-ins to execute some code after
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/// attaching to a process.
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void DynamicLoaderStatic::DidAttach() { LoadAllImagesAtFileAddresses(); }
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/// Called after attaching a process.
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///
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/// Allow DynamicLoader plug-ins to execute some code after
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/// attaching to a process.
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void DynamicLoaderStatic::DidLaunch() { LoadAllImagesAtFileAddresses(); }
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void DynamicLoaderStatic::LoadAllImagesAtFileAddresses() {
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const ModuleList &module_list = m_process->GetTarget().GetImages();
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ModuleList loaded_module_list;
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// Disable JIT for static dynamic loader targets
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m_process->SetCanJIT(false);
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Target &target = m_process->GetTarget();
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for (ModuleSP module_sp : module_list.Modules()) {
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if (module_sp) {
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bool changed = false;
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bool no_load_addresses = true;
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// If this module has a section with a load address set in
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// the target, assume all necessary work is already done. There
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// may be sections without a load address set intentionally
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// and we don't want to mutate that.
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// For a module with no load addresses set, set the load addresses
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// to slide == 0, the same as the file addresses, in the target.
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ObjectFile *image_object_file = module_sp->GetObjectFile();
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if (image_object_file) {
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SectionList *section_list = image_object_file->GetSectionList();
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if (section_list) {
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const size_t num_sections = section_list->GetSize();
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for (size_t sect_idx = 0; sect_idx < num_sections; ++sect_idx) {
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SectionSP section_sp(section_list->GetSectionAtIndex(sect_idx));
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if (section_sp) {
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if (target.GetSectionLoadAddress(section_sp) !=
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LLDB_INVALID_ADDRESS) {
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no_load_addresses = false;
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break;
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}
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}
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}
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}
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}
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if (no_load_addresses)
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module_sp->SetLoadAddress(target, 0, true /*value_is_offset*/, changed);
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if (changed)
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loaded_module_list.AppendIfNeeded(module_sp);
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}
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}
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target.ModulesDidLoad(loaded_module_list);
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}
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ThreadPlanSP
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DynamicLoaderStatic::GetStepThroughTrampolinePlan(Thread &thread,
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bool stop_others) {
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return ThreadPlanSP();
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}
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Status DynamicLoaderStatic::CanLoadImage() {
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return Status::FromErrorString(
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"can't load images on with a static debug session");
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}
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void DynamicLoaderStatic::Initialize() {
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PluginManager::RegisterPlugin(GetPluginNameStatic(),
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GetPluginDescriptionStatic(), CreateInstance);
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}
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void DynamicLoaderStatic::Terminate() {
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PluginManager::UnregisterPlugin(CreateInstance);
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}
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llvm::StringRef DynamicLoaderStatic::GetPluginDescriptionStatic() {
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return "Dynamic loader plug-in that will load any images at the static "
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"addresses contained in each image.";
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}
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