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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/ManualDWARFIndexSet.h"
#include "lldb/Core/DataFileCache.h"
#include "lldb/Utility/DataEncoder.h"
#include "lldb/Utility/DataExtractor.h"
#include <cstdint>
using namespace lldb_private;
using namespace lldb_private::plugin::dwarf;
namespace {
// 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,
};
} // namespace
// Version 2 changes the encoding of DIERef objects used in the DWARF manual
// index name tables. See DIERef class for details.
static constexpr uint32_t CURRENT_CACHE_VERSION = 2;
static constexpr llvm::StringLiteral kIdentifierManualDWARFIndex("DIDX");
std::optional<IndexSet<NameToDIE>>
plugin::dwarf::DecodeIndexSet(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 std::nullopt;
llvm::StringRef identifier((const char *)data.GetData(offset_ptr, 4), 4);
if (identifier != kIdentifierManualDWARFIndex)
return std::nullopt;
const uint32_t version = data.GetU32(offset_ptr);
if (version != CURRENT_CACHE_VERSION)
return std::nullopt;
IndexSet<NameToDIE> result;
while (true) {
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 std::nullopt;
case kDataIDFunctionBasenames:
if (!result.function_basenames.Decode(data, offset_ptr, strtab))
return std::nullopt;
break;
case kDataIDFunctionFullnames:
if (!result.function_fullnames.Decode(data, offset_ptr, strtab))
return std::nullopt;
break;
case kDataIDFunctionMethods:
if (!result.function_methods.Decode(data, offset_ptr, strtab))
return std::nullopt;
break;
case kDataIDFunctionSelectors:
if (!result.function_selectors.Decode(data, offset_ptr, strtab))
return std::nullopt;
break;
case kDataIDFunctionObjcClassSelectors:
if (!result.objc_class_selectors.Decode(data, offset_ptr, strtab))
return std::nullopt;
break;
case kDataIDGlobals:
if (!result.globals.Decode(data, offset_ptr, strtab))
return std::nullopt;
break;
case kDataIDTypes:
if (!result.types.Decode(data, offset_ptr, strtab))
return std::nullopt;
break;
case kDataIDNamespaces:
if (!result.namespaces.Decode(data, offset_ptr, strtab))
return std::nullopt;
break;
case kDataIDEnd:
// We got to the end of our NameToDIE encodings.
return std::move(result);
break;
}
}
}
void plugin::dwarf::EncodeIndexSet(const IndexSet<NameToDIE> &set,
DataEncoder &encoder) {
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 (!set.function_basenames.IsEmpty()) {
index_encoder.AppendU8(kDataIDFunctionBasenames);
set.function_basenames.Encode(index_encoder, strtab);
}
if (!set.function_fullnames.IsEmpty()) {
index_encoder.AppendU8(kDataIDFunctionFullnames);
set.function_fullnames.Encode(index_encoder, strtab);
}
if (!set.function_methods.IsEmpty()) {
index_encoder.AppendU8(kDataIDFunctionMethods);
set.function_methods.Encode(index_encoder, strtab);
}
if (!set.function_selectors.IsEmpty()) {
index_encoder.AppendU8(kDataIDFunctionSelectors);
set.function_selectors.Encode(index_encoder, strtab);
}
if (!set.objc_class_selectors.IsEmpty()) {
index_encoder.AppendU8(kDataIDFunctionObjcClassSelectors);
set.objc_class_selectors.Encode(index_encoder, strtab);
}
if (!set.globals.IsEmpty()) {
index_encoder.AppendU8(kDataIDGlobals);
set.globals.Encode(index_encoder, strtab);
}
if (!set.types.IsEmpty()) {
index_encoder.AppendU8(kDataIDTypes);
set.types.Encode(index_encoder, strtab);
}
if (!set.namespaces.IsEmpty()) {
index_encoder.AppendU8(kDataIDNamespaces);
set.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());
}
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