9b12dc98fd
This patch changes the way we initialize and terminate the plugins in the system initializer. It uses an approach similar to LLVM's TARGETS_TO_BUILD with a def file that enumerates the plugins. The previously landed patch got reverted because it was lacking: (1) A plugin definition for the Objective-C language runtime, (2) The dependency between the Static and WASM dynamic loader, (3) Explicit initialization of ScriptInterpreterNone for lldb-test. All issues have been addressed in this patch. Differential revision: https://reviews.llvm.org/D73067
263 lines
8.5 KiB
C++
263 lines
8.5 KiB
C++
//===-- ObjectFileJIT.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 "llvm/ADT/StringRef.h"
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#include "ObjectFileJIT.h"
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#include "lldb/Core/Debugger.h"
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#include "lldb/Core/FileSpecList.h"
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#include "lldb/Core/Module.h"
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#include "lldb/Core/ModuleSpec.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/Core/StreamFile.h"
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#include "lldb/Host/Host.h"
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#include "lldb/Symbol/ObjectFile.h"
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#include "lldb/Target/Platform.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/SectionLoadList.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Utility/ArchSpec.h"
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#include "lldb/Utility/DataBuffer.h"
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#include "lldb/Utility/DataBufferHeap.h"
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#include "lldb/Utility/FileSpec.h"
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#include "lldb/Utility/Log.h"
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#include "lldb/Utility/RangeMap.h"
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#include "lldb/Utility/StreamString.h"
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#include "lldb/Utility/Timer.h"
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#include "lldb/Utility/UUID.h"
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#ifndef __APPLE__
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#include "Utility/UuidCompatibility.h"
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#endif
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using namespace lldb;
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using namespace lldb_private;
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LLDB_PLUGIN_DEFINE(ObjectFileJIT)
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char ObjectFileJIT::ID;
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void ObjectFileJIT::Initialize() {
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PluginManager::RegisterPlugin(GetPluginNameStatic(),
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GetPluginDescriptionStatic(), CreateInstance,
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CreateMemoryInstance, GetModuleSpecifications);
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}
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void ObjectFileJIT::Terminate() {
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PluginManager::UnregisterPlugin(CreateInstance);
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}
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lldb_private::ConstString ObjectFileJIT::GetPluginNameStatic() {
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static ConstString g_name("jit");
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return g_name;
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}
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const char *ObjectFileJIT::GetPluginDescriptionStatic() {
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return "JIT code object file";
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}
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ObjectFile *ObjectFileJIT::CreateInstance(const lldb::ModuleSP &module_sp,
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DataBufferSP &data_sp,
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lldb::offset_t data_offset,
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const FileSpec *file,
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lldb::offset_t file_offset,
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lldb::offset_t length) {
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// JIT'ed object file is backed by the ObjectFileJITDelegate, never read from
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// a file
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return nullptr;
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}
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ObjectFile *ObjectFileJIT::CreateMemoryInstance(const lldb::ModuleSP &module_sp,
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DataBufferSP &data_sp,
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const ProcessSP &process_sp,
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lldb::addr_t header_addr) {
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// JIT'ed object file is backed by the ObjectFileJITDelegate, never read from
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// memory
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return nullptr;
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}
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size_t ObjectFileJIT::GetModuleSpecifications(
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const lldb_private::FileSpec &file, lldb::DataBufferSP &data_sp,
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lldb::offset_t data_offset, lldb::offset_t file_offset,
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lldb::offset_t length, lldb_private::ModuleSpecList &specs) {
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// JIT'ed object file can't be read from a file on disk
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return 0;
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}
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ObjectFileJIT::ObjectFileJIT(const lldb::ModuleSP &module_sp,
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const ObjectFileJITDelegateSP &delegate_sp)
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: ObjectFile(module_sp, nullptr, 0, 0, DataBufferSP(), 0), m_delegate_wp() {
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if (delegate_sp) {
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m_delegate_wp = delegate_sp;
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m_data.SetByteOrder(delegate_sp->GetByteOrder());
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m_data.SetAddressByteSize(delegate_sp->GetAddressByteSize());
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}
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}
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ObjectFileJIT::~ObjectFileJIT() {}
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bool ObjectFileJIT::ParseHeader() {
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// JIT code is never in a file, nor is it required to have any header
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return false;
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}
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ByteOrder ObjectFileJIT::GetByteOrder() const { return m_data.GetByteOrder(); }
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bool ObjectFileJIT::IsExecutable() const { return false; }
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uint32_t ObjectFileJIT::GetAddressByteSize() const {
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return m_data.GetAddressByteSize();
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}
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Symtab *ObjectFileJIT::GetSymtab() {
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ModuleSP module_sp(GetModule());
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if (module_sp) {
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std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex());
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if (m_symtab_up == nullptr) {
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m_symtab_up.reset(new Symtab(this));
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std::lock_guard<std::recursive_mutex> symtab_guard(
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m_symtab_up->GetMutex());
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ObjectFileJITDelegateSP delegate_sp(m_delegate_wp.lock());
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if (delegate_sp)
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delegate_sp->PopulateSymtab(this, *m_symtab_up);
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// TODO: get symbols from delegate
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m_symtab_up->Finalize();
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}
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}
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return m_symtab_up.get();
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}
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bool ObjectFileJIT::IsStripped() {
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return false; // JIT code that is in a module is never stripped
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}
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void ObjectFileJIT::CreateSections(SectionList &unified_section_list) {
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if (!m_sections_up) {
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m_sections_up.reset(new SectionList());
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ObjectFileJITDelegateSP delegate_sp(m_delegate_wp.lock());
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if (delegate_sp) {
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delegate_sp->PopulateSectionList(this, *m_sections_up);
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unified_section_list = *m_sections_up;
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}
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}
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}
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void ObjectFileJIT::Dump(Stream *s) {
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ModuleSP module_sp(GetModule());
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if (module_sp) {
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std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex());
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s->Printf("%p: ", static_cast<void *>(this));
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s->Indent();
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s->PutCString("ObjectFileJIT");
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if (ArchSpec arch = GetArchitecture())
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*s << ", arch = " << arch.GetArchitectureName();
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s->EOL();
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SectionList *sections = GetSectionList();
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if (sections)
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sections->Dump(s, nullptr, true, UINT32_MAX);
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if (m_symtab_up)
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m_symtab_up->Dump(s, nullptr, eSortOrderNone);
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}
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}
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UUID ObjectFileJIT::GetUUID() {
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// TODO: maybe get from delegate, not needed for first pass
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return UUID();
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}
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uint32_t ObjectFileJIT::GetDependentModules(FileSpecList &files) {
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// JIT modules don't have dependencies, but they could
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// if external functions are called and we know where they are
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files.Clear();
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return 0;
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}
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lldb_private::Address ObjectFileJIT::GetEntryPointAddress() {
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return Address();
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}
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lldb_private::Address ObjectFileJIT::GetBaseAddress() { return Address(); }
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ObjectFile::Type ObjectFileJIT::CalculateType() { return eTypeJIT; }
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ObjectFile::Strata ObjectFileJIT::CalculateStrata() { return eStrataJIT; }
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ArchSpec ObjectFileJIT::GetArchitecture() {
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if (ObjectFileJITDelegateSP delegate_sp = m_delegate_wp.lock())
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return delegate_sp->GetArchitecture();
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return ArchSpec();
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}
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// PluginInterface protocol
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lldb_private::ConstString ObjectFileJIT::GetPluginName() {
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return GetPluginNameStatic();
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}
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uint32_t ObjectFileJIT::GetPluginVersion() { return 1; }
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bool ObjectFileJIT::SetLoadAddress(Target &target, lldb::addr_t value,
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bool value_is_offset) {
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size_t num_loaded_sections = 0;
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SectionList *section_list = GetSectionList();
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if (section_list) {
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const size_t num_sections = section_list->GetSize();
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// "value" is an offset to apply to each top level segment
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for (size_t sect_idx = 0; sect_idx < num_sections; ++sect_idx) {
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// Iterate through the object file sections to find all of the sections
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// that size on disk (to avoid __PAGEZERO) and load them
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SectionSP section_sp(section_list->GetSectionAtIndex(sect_idx));
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if (section_sp && section_sp->GetFileSize() > 0 &&
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!section_sp->IsThreadSpecific()) {
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if (target.GetSectionLoadList().SetSectionLoadAddress(
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section_sp, section_sp->GetFileAddress() + value))
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++num_loaded_sections;
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}
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}
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}
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return num_loaded_sections > 0;
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}
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size_t ObjectFileJIT::ReadSectionData(lldb_private::Section *section,
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lldb::offset_t section_offset, void *dst,
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size_t dst_len) {
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lldb::offset_t file_size = section->GetFileSize();
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if (section_offset < file_size) {
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size_t src_len = file_size - section_offset;
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if (src_len > dst_len)
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src_len = dst_len;
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const uint8_t *src =
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((uint8_t *)(uintptr_t)section->GetFileOffset()) + section_offset;
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memcpy(dst, src, src_len);
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return src_len;
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}
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return 0;
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}
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size_t ObjectFileJIT::ReadSectionData(
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lldb_private::Section *section,
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lldb_private::DataExtractor §ion_data) {
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if (section->GetFileSize()) {
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const void *src = (void *)(uintptr_t)section->GetFileOffset();
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DataBufferSP data_sp =
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std::make_shared<DataBufferHeap>(src, section->GetFileSize());
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section_data.SetData(data_sp, 0, data_sp->GetByteSize());
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section_data.SetByteOrder(GetByteOrder());
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section_data.SetAddressByteSize(GetAddressByteSize());
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return section_data.GetByteSize();
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}
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section_data.Clear();
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return 0;
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}
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