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bolt/deps/llvm-18.1.8/lldb/source/Plugins/SymbolFile/DWARF/ManualDWARFIndex.cpp
Sam Vervaeck 174b6f4d4e
Embed LLVM 18.1.8
2025-02-14 19:21:04 +01:00

737 lines
26 KiB
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//===-- ManualDWARFIndex.cpp ----------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "Plugins/SymbolFile/DWARF/ManualDWARFIndex.h"
#include "Plugins/Language/ObjC/ObjCLanguage.h"
#include "Plugins/SymbolFile/DWARF/DWARFDebugInfo.h"
#include "Plugins/SymbolFile/DWARF/DWARFDeclContext.h"
#include "Plugins/SymbolFile/DWARF/LogChannelDWARF.h"
#include "Plugins/SymbolFile/DWARF/SymbolFileDWARFDwo.h"
#include "lldb/Core/DataFileCache.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/Progress.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Utility/DataEncoder.h"
#include "lldb/Utility/DataExtractor.h"
#include "lldb/Utility/Stream.h"
#include "lldb/Utility/Timer.h"
#include "llvm/Support/FormatVariadic.h"
#include "llvm/Support/ThreadPool.h"
#include <optional>
using namespace lldb_private;
using namespace lldb;
using namespace lldb_private::dwarf;
using namespace lldb_private::plugin::dwarf;
void ManualDWARFIndex::Index() {
if (m_indexed)
return;
m_indexed = true;
ElapsedTime elapsed(m_index_time);
LLDB_SCOPED_TIMERF("%p", static_cast<void *>(m_dwarf));
if (LoadFromCache()) {
m_dwarf->SetDebugInfoIndexWasLoadedFromCache();
return;
}
DWARFDebugInfo &main_info = m_dwarf->DebugInfo();
SymbolFileDWARFDwo *dwp_dwarf = m_dwarf->GetDwpSymbolFile().get();
DWARFDebugInfo *dwp_info = dwp_dwarf ? &dwp_dwarf->DebugInfo() : nullptr;
std::vector<DWARFUnit *> units_to_index;
units_to_index.reserve(main_info.GetNumUnits() +
(dwp_info ? dwp_info->GetNumUnits() : 0));
// Process all units in the main file, as well as any type units in the dwp
// file. Type units in dwo files are handled when we reach the dwo file in
// IndexUnit.
for (size_t U = 0; U < main_info.GetNumUnits(); ++U) {
DWARFUnit *unit = main_info.GetUnitAtIndex(U);
if (unit && m_units_to_avoid.count(unit->GetOffset()) == 0)
units_to_index.push_back(unit);
}
if (dwp_info && dwp_info->ContainsTypeUnits()) {
for (size_t U = 0; U < dwp_info->GetNumUnits(); ++U) {
if (auto *tu = llvm::dyn_cast<DWARFTypeUnit>(dwp_info->GetUnitAtIndex(U)))
units_to_index.push_back(tu);
}
}
if (units_to_index.empty())
return;
StreamString module_desc;
m_module.GetDescription(module_desc.AsRawOstream(),
lldb::eDescriptionLevelBrief);
// Include 2 passes per unit to index for extracting DIEs from the unit and
// indexing the unit, and then 8 extra entries for finalizing each index set.
const uint64_t total_progress = units_to_index.size() * 2 + 8;
Progress progress("Manually indexing DWARF", module_desc.GetData(),
total_progress);
std::vector<IndexSet> sets(units_to_index.size());
// Keep memory down by clearing DIEs for any units if indexing
// caused us to load the unit's DIEs.
std::vector<std::optional<DWARFUnit::ScopedExtractDIEs>> clear_cu_dies(
units_to_index.size());
auto parser_fn = [&](size_t cu_idx) {
IndexUnit(*units_to_index[cu_idx], dwp_dwarf, sets[cu_idx]);
progress.Increment();
};
auto extract_fn = [&](size_t cu_idx) {
clear_cu_dies[cu_idx] = units_to_index[cu_idx]->ExtractDIEsScoped();
progress.Increment();
};
// Share one thread pool across operations to avoid the overhead of
// recreating the threads.
llvm::ThreadPoolTaskGroup task_group(Debugger::GetThreadPool());
// Create a task runner that extracts dies for each DWARF unit in a
// separate thread.
// First figure out which units didn't have their DIEs already
// parsed and remember this. If no DIEs were parsed prior to this index
// function call, we are going to want to clear the CU dies after we are
// done indexing to make sure we don't pull in all DWARF dies, but we need
// to wait until all units have been indexed in case a DIE in one
// unit refers to another and the indexes accesses those DIEs.
for (size_t i = 0; i < units_to_index.size(); ++i)
task_group.async(extract_fn, i);
task_group.wait();
// Now create a task runner that can index each DWARF unit in a
// separate thread so we can index quickly.
for (size_t i = 0; i < units_to_index.size(); ++i)
task_group.async(parser_fn, i);
task_group.wait();
auto finalize_fn = [this, &sets, &progress](NameToDIE(IndexSet::*index)) {
NameToDIE &result = m_set.*index;
for (auto &set : sets)
result.Append(set.*index);
result.Finalize();
progress.Increment();
};
task_group.async(finalize_fn, &IndexSet::function_basenames);
task_group.async(finalize_fn, &IndexSet::function_fullnames);
task_group.async(finalize_fn, &IndexSet::function_methods);
task_group.async(finalize_fn, &IndexSet::function_selectors);
task_group.async(finalize_fn, &IndexSet::objc_class_selectors);
task_group.async(finalize_fn, &IndexSet::globals);
task_group.async(finalize_fn, &IndexSet::types);
task_group.async(finalize_fn, &IndexSet::namespaces);
task_group.wait();
SaveToCache();
}
void ManualDWARFIndex::IndexUnit(DWARFUnit &unit, SymbolFileDWARFDwo *dwp,
IndexSet &set) {
Log *log = GetLog(DWARFLog::Lookups);
if (log) {
m_module.LogMessage(
log, "ManualDWARFIndex::IndexUnit for unit at .debug_info[{0:x16}]",
unit.GetOffset());
}
const LanguageType cu_language = SymbolFileDWARF::GetLanguage(unit);
// First check if the unit has a DWO ID. If it does then we only want to index
// the .dwo file or nothing at all. If we have a compile unit where we can't
// locate the .dwo/.dwp file we don't want to index anything from the skeleton
// compile unit because it is usally has no children unless
// -fsplit-dwarf-inlining was used at compile time. This option will add a
// copy of all DW_TAG_subprogram and any contained DW_TAG_inline_subroutine
// DIEs so that symbolication will still work in the absence of the .dwo/.dwp
// file, but the functions have no return types and all arguments and locals
// have been removed. So we don't want to index any of these hacked up
// function types. Types can still exist in the skeleton compile unit DWARF
// though as some functions have template parameter types and other things
// that cause extra copies of types to be included, but we should find these
// types in the .dwo file only as methods could have return types removed and
// we don't have to index incomplete types from the skeleton compile unit.
if (unit.GetDWOId()) {
// Index the .dwo or dwp instead of the skeleton unit.
if (SymbolFileDWARFDwo *dwo_symbol_file = unit.GetDwoSymbolFile()) {
// Type units in a dwp file are indexed separately, so we just need to
// process the split unit here. However, if the split unit is in a dwo
// file, then we need to process type units here.
if (dwo_symbol_file == dwp) {
IndexUnitImpl(unit.GetNonSkeletonUnit(), cu_language, set);
} else {
DWARFDebugInfo &dwo_info = dwo_symbol_file->DebugInfo();
for (size_t i = 0; i < dwo_info.GetNumUnits(); ++i)
IndexUnitImpl(*dwo_info.GetUnitAtIndex(i), cu_language, set);
}
return;
}
// This was a DWARF5 skeleton CU and the .dwo file couldn't be located.
if (unit.GetVersion() >= 5 && unit.IsSkeletonUnit())
return;
// Either this is a DWARF 4 + fission CU with the .dwo file
// missing, or it's a -gmodules pch or pcm. Try to detect the
// latter by checking whether the first DIE is a DW_TAG_module.
// If it's a pch/pcm, continue indexing it.
if (unit.GetDIE(unit.GetFirstDIEOffset()).GetFirstChild().Tag() !=
llvm::dwarf::DW_TAG_module)
return;
}
// We have a normal compile unit which we want to index.
IndexUnitImpl(unit, cu_language, set);
}
void ManualDWARFIndex::IndexUnitImpl(DWARFUnit &unit,
const LanguageType cu_language,
IndexSet &set) {
for (const DWARFDebugInfoEntry &die : unit.dies()) {
const dw_tag_t tag = die.Tag();
switch (tag) {
case DW_TAG_array_type:
case DW_TAG_base_type:
case DW_TAG_class_type:
case DW_TAG_constant:
case DW_TAG_enumeration_type:
case DW_TAG_inlined_subroutine:
case DW_TAG_namespace:
case DW_TAG_imported_declaration:
case DW_TAG_string_type:
case DW_TAG_structure_type:
case DW_TAG_subprogram:
case DW_TAG_subroutine_type:
case DW_TAG_typedef:
case DW_TAG_union_type:
case DW_TAG_unspecified_type:
case DW_TAG_variable:
break;
default:
continue;
}
const char *name = nullptr;
const char *mangled_cstr = nullptr;
bool is_declaration = false;
bool has_address = false;
bool has_location_or_const_value = false;
bool is_global_or_static_variable = false;
DWARFFormValue specification_die_form;
DWARFAttributes attributes = die.GetAttributes(&unit);
for (size_t i = 0; i < attributes.Size(); ++i) {
dw_attr_t attr = attributes.AttributeAtIndex(i);
DWARFFormValue form_value;
switch (attr) {
default:
break;
case DW_AT_name:
if (attributes.ExtractFormValueAtIndex(i, form_value))
name = form_value.AsCString();
break;
case DW_AT_declaration:
if (attributes.ExtractFormValueAtIndex(i, form_value))
is_declaration = form_value.Unsigned() != 0;
break;
case DW_AT_MIPS_linkage_name:
case DW_AT_linkage_name:
if (attributes.ExtractFormValueAtIndex(i, form_value))
mangled_cstr = form_value.AsCString();
break;
case DW_AT_low_pc:
case DW_AT_high_pc:
case DW_AT_ranges:
has_address = true;
break;
case DW_AT_entry_pc:
has_address = true;
break;
case DW_AT_location:
case DW_AT_const_value:
has_location_or_const_value = true;
is_global_or_static_variable = die.IsGlobalOrStaticScopeVariable();
break;
case DW_AT_specification:
if (attributes.ExtractFormValueAtIndex(i, form_value))
specification_die_form = form_value;
break;
}
}
DIERef ref = *DWARFDIE(&unit, &die).GetDIERef();
switch (tag) {
case DW_TAG_inlined_subroutine:
case DW_TAG_subprogram:
if (has_address) {
if (name) {
bool is_objc_method = false;
if (cu_language == eLanguageTypeObjC ||
cu_language == eLanguageTypeObjC_plus_plus) {
std::optional<const ObjCLanguage::MethodName> objc_method =
ObjCLanguage::MethodName::Create(name, true);
if (objc_method) {
is_objc_method = true;
ConstString class_name_with_category(
objc_method->GetClassNameWithCategory());
ConstString objc_selector_name(objc_method->GetSelector());
ConstString objc_fullname_no_category_name(
objc_method->GetFullNameWithoutCategory().c_str());
ConstString class_name_no_category(objc_method->GetClassName());
set.function_fullnames.Insert(ConstString(name), ref);
if (class_name_with_category)
set.objc_class_selectors.Insert(class_name_with_category, ref);
if (class_name_no_category &&
class_name_no_category != class_name_with_category)
set.objc_class_selectors.Insert(class_name_no_category, ref);
if (objc_selector_name)
set.function_selectors.Insert(objc_selector_name, ref);
if (objc_fullname_no_category_name)
set.function_fullnames.Insert(objc_fullname_no_category_name,
ref);
}
}
// If we have a mangled name, then the DW_AT_name attribute is
// usually the method name without the class or any parameters
bool is_method = DWARFDIE(&unit, &die).IsMethod();
if (is_method)
set.function_methods.Insert(ConstString(name), ref);
else
set.function_basenames.Insert(ConstString(name), ref);
if (!is_method && !mangled_cstr && !is_objc_method)
set.function_fullnames.Insert(ConstString(name), ref);
}
if (mangled_cstr) {
// Make sure our mangled name isn't the same string table entry as
// our name. If it starts with '_', then it is ok, else compare the
// string to make sure it isn't the same and we don't end up with
// duplicate entries
if (name && name != mangled_cstr &&
((mangled_cstr[0] == '_') ||
(::strcmp(name, mangled_cstr) != 0))) {
set.function_fullnames.Insert(ConstString(mangled_cstr), ref);
}
}
}
break;
case DW_TAG_array_type:
case DW_TAG_base_type:
case DW_TAG_class_type:
case DW_TAG_constant:
case DW_TAG_enumeration_type:
case DW_TAG_string_type:
case DW_TAG_structure_type:
case DW_TAG_subroutine_type:
case DW_TAG_typedef:
case DW_TAG_union_type:
case DW_TAG_unspecified_type:
if (name && !is_declaration)
set.types.Insert(ConstString(name), ref);
if (mangled_cstr && !is_declaration)
set.types.Insert(ConstString(mangled_cstr), ref);
break;
case DW_TAG_namespace:
case DW_TAG_imported_declaration:
if (name)
set.namespaces.Insert(ConstString(name), ref);
break;
case DW_TAG_variable:
if (name && has_location_or_const_value && is_global_or_static_variable) {
set.globals.Insert(ConstString(name), ref);
// Be sure to include variables by their mangled and demangled names if
// they have any since a variable can have a basename "i", a mangled
// named "_ZN12_GLOBAL__N_11iE" and a demangled mangled name
// "(anonymous namespace)::i"...
// Make sure our mangled name isn't the same string table entry as our
// name. If it starts with '_', then it is ok, else compare the string
// to make sure it isn't the same and we don't end up with duplicate
// entries
if (mangled_cstr && name != mangled_cstr &&
((mangled_cstr[0] == '_') || (::strcmp(name, mangled_cstr) != 0))) {
set.globals.Insert(ConstString(mangled_cstr), ref);
}
}
break;
default:
continue;
}
}
}
void ManualDWARFIndex::GetGlobalVariables(
ConstString basename, llvm::function_ref<bool(DWARFDIE die)> callback) {
Index();
m_set.globals.Find(basename,
DIERefCallback(callback, basename.GetStringRef()));
}
void ManualDWARFIndex::GetGlobalVariables(
const RegularExpression &regex,
llvm::function_ref<bool(DWARFDIE die)> callback) {
Index();
m_set.globals.Find(regex, DIERefCallback(callback, regex.GetText()));
}
void ManualDWARFIndex::GetGlobalVariables(
DWARFUnit &unit, llvm::function_ref<bool(DWARFDIE die)> callback) {
Index();
m_set.globals.FindAllEntriesForUnit(unit, DIERefCallback(callback));
}
void ManualDWARFIndex::GetObjCMethods(
ConstString class_name, llvm::function_ref<bool(DWARFDIE die)> callback) {
Index();
m_set.objc_class_selectors.Find(
class_name, DIERefCallback(callback, class_name.GetStringRef()));
}
void ManualDWARFIndex::GetCompleteObjCClass(
ConstString class_name, bool must_be_implementation,
llvm::function_ref<bool(DWARFDIE die)> callback) {
Index();
m_set.types.Find(class_name,
DIERefCallback(callback, class_name.GetStringRef()));
}
void ManualDWARFIndex::GetTypes(
ConstString name, llvm::function_ref<bool(DWARFDIE die)> callback) {
Index();
m_set.types.Find(name, DIERefCallback(callback, name.GetStringRef()));
}
void ManualDWARFIndex::GetTypes(
const DWARFDeclContext &context,
llvm::function_ref<bool(DWARFDIE die)> callback) {
Index();
auto name = context[0].name;
m_set.types.Find(ConstString(name),
DIERefCallback(callback, llvm::StringRef(name)));
}
void ManualDWARFIndex::GetNamespaces(
ConstString name, llvm::function_ref<bool(DWARFDIE die)> callback) {
Index();
m_set.namespaces.Find(name, DIERefCallback(callback, name.GetStringRef()));
}
void ManualDWARFIndex::GetFunctions(
const Module::LookupInfo &lookup_info, SymbolFileDWARF &dwarf,
const CompilerDeclContext &parent_decl_ctx,
llvm::function_ref<bool(DWARFDIE die)> callback) {
Index();
ConstString name = lookup_info.GetLookupName();
FunctionNameType name_type_mask = lookup_info.GetNameTypeMask();
if (name_type_mask & eFunctionNameTypeFull) {
if (!m_set.function_fullnames.Find(
name, DIERefCallback(
[&](DWARFDIE die) {
if (!SymbolFileDWARF::DIEInDeclContext(parent_decl_ctx,
die))
return true;
return callback(die);
},
name.GetStringRef())))
return;
}
if (name_type_mask & eFunctionNameTypeBase) {
if (!m_set.function_basenames.Find(
name, DIERefCallback(
[&](DWARFDIE die) {
if (!SymbolFileDWARF::DIEInDeclContext(parent_decl_ctx,
die))
return true;
return callback(die);
},
name.GetStringRef())))
return;
}
if (name_type_mask & eFunctionNameTypeMethod && !parent_decl_ctx.IsValid()) {
if (!m_set.function_methods.Find(
name, DIERefCallback(callback, name.GetStringRef())))
return;
}
if (name_type_mask & eFunctionNameTypeSelector &&
!parent_decl_ctx.IsValid()) {
if (!m_set.function_selectors.Find(
name, DIERefCallback(callback, name.GetStringRef())))
return;
}
}
void ManualDWARFIndex::GetFunctions(
const RegularExpression &regex,
llvm::function_ref<bool(DWARFDIE die)> callback) {
Index();
if (!m_set.function_basenames.Find(regex,
DIERefCallback(callback, regex.GetText())))
return;
if (!m_set.function_fullnames.Find(regex,
DIERefCallback(callback, regex.GetText())))
return;
}
void ManualDWARFIndex::Dump(Stream &s) {
s.Format("Manual DWARF index for ({0}) '{1:F}':",
m_module.GetArchitecture().GetArchitectureName(),
m_module.GetObjectFile()->GetFileSpec());
s.Printf("\nFunction basenames:\n");
m_set.function_basenames.Dump(&s);
s.Printf("\nFunction fullnames:\n");
m_set.function_fullnames.Dump(&s);
s.Printf("\nFunction methods:\n");
m_set.function_methods.Dump(&s);
s.Printf("\nFunction selectors:\n");
m_set.function_selectors.Dump(&s);
s.Printf("\nObjective-C class selectors:\n");
m_set.objc_class_selectors.Dump(&s);
s.Printf("\nGlobals and statics:\n");
m_set.globals.Dump(&s);
s.Printf("\nTypes:\n");
m_set.types.Dump(&s);
s.Printf("\nNamespaces:\n");
m_set.namespaces.Dump(&s);
}
constexpr llvm::StringLiteral kIdentifierManualDWARFIndex("DIDX");
// Define IDs for the different tables when encoding and decoding the
// ManualDWARFIndex NameToDIE objects so we can avoid saving any empty maps.
enum DataID {
kDataIDFunctionBasenames = 1u,
kDataIDFunctionFullnames,
kDataIDFunctionMethods,
kDataIDFunctionSelectors,
kDataIDFunctionObjcClassSelectors,
kDataIDGlobals,
kDataIDTypes,
kDataIDNamespaces,
kDataIDEnd = 255u,
};
// Version 2 changes the encoding of DIERef objects used in the DWARF manual
// index name tables. See DIERef class for details.
constexpr uint32_t CURRENT_CACHE_VERSION = 2;
bool ManualDWARFIndex::IndexSet::Decode(const DataExtractor &data,
lldb::offset_t *offset_ptr) {
StringTableReader strtab;
// We now decode the string table for all strings in the data cache file.
if (!strtab.Decode(data, offset_ptr))
return false;
llvm::StringRef identifier((const char *)data.GetData(offset_ptr, 4), 4);
if (identifier != kIdentifierManualDWARFIndex)
return false;
const uint32_t version = data.GetU32(offset_ptr);
if (version != CURRENT_CACHE_VERSION)
return false;
bool done = false;
while (!done) {
switch (data.GetU8(offset_ptr)) {
default:
// If we got here, this is not expected, we expect the data IDs to match
// one of the values from the DataID enumeration.
return false;
case kDataIDFunctionBasenames:
if (!function_basenames.Decode(data, offset_ptr, strtab))
return false;
break;
case kDataIDFunctionFullnames:
if (!function_fullnames.Decode(data, offset_ptr, strtab))
return false;
break;
case kDataIDFunctionMethods:
if (!function_methods.Decode(data, offset_ptr, strtab))
return false;
break;
case kDataIDFunctionSelectors:
if (!function_selectors.Decode(data, offset_ptr, strtab))
return false;
break;
case kDataIDFunctionObjcClassSelectors:
if (!objc_class_selectors.Decode(data, offset_ptr, strtab))
return false;
break;
case kDataIDGlobals:
if (!globals.Decode(data, offset_ptr, strtab))
return false;
break;
case kDataIDTypes:
if (!types.Decode(data, offset_ptr, strtab))
return false;
break;
case kDataIDNamespaces:
if (!namespaces.Decode(data, offset_ptr, strtab))
return false;
break;
case kDataIDEnd:
// We got to the end of our NameToDIE encodings.
done = true;
break;
}
}
// Success!
return true;
}
void ManualDWARFIndex::IndexSet::Encode(DataEncoder &encoder) const {
ConstStringTable strtab;
// Encoder the DWARF index into a separate encoder first. This allows us
// gather all of the strings we willl need in "strtab" as we will need to
// write the string table out before the symbol table.
DataEncoder index_encoder(encoder.GetByteOrder(),
encoder.GetAddressByteSize());
index_encoder.AppendData(kIdentifierManualDWARFIndex);
// Encode the data version.
index_encoder.AppendU32(CURRENT_CACHE_VERSION);
if (!function_basenames.IsEmpty()) {
index_encoder.AppendU8(kDataIDFunctionBasenames);
function_basenames.Encode(index_encoder, strtab);
}
if (!function_fullnames.IsEmpty()) {
index_encoder.AppendU8(kDataIDFunctionFullnames);
function_fullnames.Encode(index_encoder, strtab);
}
if (!function_methods.IsEmpty()) {
index_encoder.AppendU8(kDataIDFunctionMethods);
function_methods.Encode(index_encoder, strtab);
}
if (!function_selectors.IsEmpty()) {
index_encoder.AppendU8(kDataIDFunctionSelectors);
function_selectors.Encode(index_encoder, strtab);
}
if (!objc_class_selectors.IsEmpty()) {
index_encoder.AppendU8(kDataIDFunctionObjcClassSelectors);
objc_class_selectors.Encode(index_encoder, strtab);
}
if (!globals.IsEmpty()) {
index_encoder.AppendU8(kDataIDGlobals);
globals.Encode(index_encoder, strtab);
}
if (!types.IsEmpty()) {
index_encoder.AppendU8(kDataIDTypes);
types.Encode(index_encoder, strtab);
}
if (!namespaces.IsEmpty()) {
index_encoder.AppendU8(kDataIDNamespaces);
namespaces.Encode(index_encoder, strtab);
}
index_encoder.AppendU8(kDataIDEnd);
// Now that all strings have been gathered, we will emit the string table.
strtab.Encode(encoder);
// Followed by the symbol table data.
encoder.AppendData(index_encoder.GetData());
}
bool ManualDWARFIndex::Decode(const DataExtractor &data,
lldb::offset_t *offset_ptr,
bool &signature_mismatch) {
signature_mismatch = false;
CacheSignature signature;
if (!signature.Decode(data, offset_ptr))
return false;
if (CacheSignature(m_dwarf->GetObjectFile()) != signature) {
signature_mismatch = true;
return false;
}
IndexSet set;
if (!set.Decode(data, offset_ptr))
return false;
m_set = std::move(set);
return true;
}
bool ManualDWARFIndex::Encode(DataEncoder &encoder) const {
CacheSignature signature(m_dwarf->GetObjectFile());
if (!signature.Encode(encoder))
return false;
m_set.Encode(encoder);
return true;
}
std::string ManualDWARFIndex::GetCacheKey() {
std::string key;
llvm::raw_string_ostream strm(key);
// DWARF Index can come from different object files for the same module. A
// module can have one object file as the main executable and might have
// another object file in a separate symbol file, or we might have a .dwo file
// that claims its module is the main executable.
ObjectFile *objfile = m_dwarf->GetObjectFile();
strm << objfile->GetModule()->GetCacheKey() << "-dwarf-index-"
<< llvm::format_hex(objfile->GetCacheHash(), 10);
return strm.str();
}
bool ManualDWARFIndex::LoadFromCache() {
DataFileCache *cache = Module::GetIndexCache();
if (!cache)
return false;
ObjectFile *objfile = m_dwarf->GetObjectFile();
if (!objfile)
return false;
std::unique_ptr<llvm::MemoryBuffer> mem_buffer_up =
cache->GetCachedData(GetCacheKey());
if (!mem_buffer_up)
return false;
DataExtractor data(mem_buffer_up->getBufferStart(),
mem_buffer_up->getBufferSize(),
endian::InlHostByteOrder(),
objfile->GetAddressByteSize());
bool signature_mismatch = false;
lldb::offset_t offset = 0;
const bool result = Decode(data, &offset, signature_mismatch);
if (signature_mismatch)
cache->RemoveCacheFile(GetCacheKey());
return result;
}
void ManualDWARFIndex::SaveToCache() {
DataFileCache *cache = Module::GetIndexCache();
if (!cache)
return; // Caching is not enabled.
ObjectFile *objfile = m_dwarf->GetObjectFile();
if (!objfile)
return;
DataEncoder file(endian::InlHostByteOrder(), objfile->GetAddressByteSize());
// Encode will return false if the object file doesn't have anything to make
// a signature from.
if (Encode(file)) {
if (cache->SetCachedData(GetCacheKey(), file.GetData()))
m_dwarf->SetDebugInfoIndexWasSavedToCache();
}
}
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