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//===-- DWARFCompileUnit.cpp ------------------------------------*- C++ -*-===//
//
// 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 "DWARFCompileUnit.h"
#include "SymbolFileDWARF.h"
#include "lldb/Utility/Stream.h"
#include "llvm/Object/Error.h"
using namespace lldb;
using namespace lldb_private;
DWARFCompileUnit::DWARFCompileUnit(SymbolFileDWARF *dwarf2Data,
lldb::user_id_t uid)
: DWARFUnit(dwarf2Data, uid) {}
llvm::Expected<DWARFUnitSP> DWARFCompileUnit::extract(
SymbolFileDWARF *dwarf2Data, user_id_t uid,
const DWARFDataExtractor &debug_info, lldb::offset_t *offset_ptr) {
assert(debug_info.ValidOffset(*offset_ptr));
// std::make_shared would require the ctor to be public.
std::shared_ptr<DWARFCompileUnit> cu_sp(
new DWARFCompileUnit(dwarf2Data, uid));
cu_sp->m_offset = *offset_ptr;
dw_offset_t abbr_offset;
const DWARFDebugAbbrev *abbr = dwarf2Data->DebugAbbrev();
if (!abbr)
return llvm::make_error<llvm::object::GenericBinaryError>(
"No debug_abbrev data");
cu_sp->m_length = debug_info.GetDWARFInitialLength(offset_ptr);
cu_sp->m_version = debug_info.GetU16(offset_ptr);
if (cu_sp->m_version == 5) {
cu_sp->m_unit_type = debug_info.GetU8(offset_ptr);
cu_sp->m_addr_size = debug_info.GetU8(offset_ptr);
abbr_offset = debug_info.GetDWARFOffset(offset_ptr);
if (cu_sp->m_unit_type == llvm::dwarf::DW_UT_skeleton)
cu_sp->m_dwo_id = debug_info.GetU64(offset_ptr);
} else {
abbr_offset = debug_info.GetDWARFOffset(offset_ptr);
cu_sp->m_addr_size = debug_info.GetU8(offset_ptr);
}
bool length_OK =
debug_info.ValidOffset(cu_sp->GetNextCompileUnitOffset() - 1);
bool version_OK = SymbolFileDWARF::SupportedVersion(cu_sp->m_version);
bool abbr_offset_OK =
dwarf2Data->get_debug_abbrev_data().ValidOffset(abbr_offset);
bool addr_size_OK = (cu_sp->m_addr_size == 4) || (cu_sp->m_addr_size == 8);
if (!length_OK)
return llvm::make_error<llvm::object::GenericBinaryError>(
"Invalid compile unit length");
if (!version_OK)
return llvm::make_error<llvm::object::GenericBinaryError>(
"Unsupported compile unit version");
if (!abbr_offset_OK)
return llvm::make_error<llvm::object::GenericBinaryError>(
"Abbreviation offset for compile unit is not valid");
if (!addr_size_OK)
return llvm::make_error<llvm::object::GenericBinaryError>(
"Invalid compile unit address size");
cu_sp->m_abbrevs = abbr->GetAbbreviationDeclarationSet(abbr_offset);
if (!cu_sp->m_abbrevs)
return llvm::make_error<llvm::object::GenericBinaryError>(
"No abbrev exists at the specified offset.");
return cu_sp;
}
void DWARFCompileUnit::Dump(Stream *s) const {
s->Printf("0x%8.8x: Compile Unit: length = 0x%8.8x, version = 0x%4.4x, "
"abbr_offset = 0x%8.8x, addr_size = 0x%2.2x (next CU at "
"{0x%8.8x})\n",
m_offset, m_length, m_version, GetAbbrevOffset(), m_addr_size,
GetNextCompileUnitOffset());
}
uint32_t DWARFCompileUnit::GetHeaderByteSize() const {
if (m_version < 5)
return 11;
switch (m_unit_type) {
case llvm::dwarf::DW_UT_compile:
case llvm::dwarf::DW_UT_partial:
return 12;
case llvm::dwarf::DW_UT_skeleton:
case llvm::dwarf::DW_UT_split_compile:
return 20;
case llvm::dwarf::DW_UT_type:
case llvm::dwarf::DW_UT_split_type:
return 24;
}
llvm_unreachable("invalid UnitType.");
}
const lldb_private::DWARFDataExtractor &DWARFCompileUnit::GetData() const {
return m_dwarf->get_debug_info_data();
}
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