c571988e9d
The new module stats adds the ability to measure the time it takes to parse and index the symbol tables for each module, and reports modules statistics in the output of "statistics dump" along with the path, UUID and triple of the module. The time it takes to parse and index the symbol tables are also aggregated into new top level key/value pairs at the target level. Differential Revision: https://reviews.llvm.org/D112279
249 lines
8.2 KiB
C++
249 lines
8.2 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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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() = default;
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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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ElapsedTime elapsed(module_sp->GetSymtabParseTime());
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m_symtab_up = std::make_unique<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 = std::make_unique<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->AsRawOstream(), s->GetIndentLevel(), nullptr, true,
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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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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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