1cbbab9277
This continues the work of introducing Error and Expected into the DWARF parsing interfaces, this time for the DWARFCompileUnit and DWARFDebugAranges classes. Differential Revision: https://reviews.llvm.org/D59381 llvm-svn: 356278
110 lines
3.7 KiB
C++
110 lines
3.7 KiB
C++
//===-- DWARFCompileUnit.cpp ------------------------------------*- C++ -*-===//
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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 "DWARFCompileUnit.h"
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#include "SymbolFileDWARF.h"
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#include "lldb/Utility/Stream.h"
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#include "llvm/Object/Error.h"
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using namespace lldb;
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using namespace lldb_private;
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DWARFCompileUnit::DWARFCompileUnit(SymbolFileDWARF *dwarf2Data)
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: DWARFUnit(dwarf2Data) {}
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llvm::Expected<DWARFUnitSP>
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DWARFCompileUnit::extract(SymbolFileDWARF *dwarf2Data,
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const DWARFDataExtractor &debug_info,
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lldb::offset_t *offset_ptr) {
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assert(debug_info.ValidOffset(*offset_ptr));
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// std::make_shared would require the ctor to be public.
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std::shared_ptr<DWARFCompileUnit> cu_sp(new DWARFCompileUnit(dwarf2Data));
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cu_sp->m_offset = *offset_ptr;
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dw_offset_t abbr_offset;
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const DWARFDebugAbbrev *abbr = dwarf2Data->DebugAbbrev();
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if (!abbr)
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return llvm::make_error<llvm::object::GenericBinaryError>(
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"No debug_abbrev data");
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cu_sp->m_length = debug_info.GetDWARFInitialLength(offset_ptr);
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cu_sp->m_version = debug_info.GetU16(offset_ptr);
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if (cu_sp->m_version == 5) {
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cu_sp->m_unit_type = debug_info.GetU8(offset_ptr);
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cu_sp->m_addr_size = debug_info.GetU8(offset_ptr);
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abbr_offset = debug_info.GetDWARFOffset(offset_ptr);
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if (cu_sp->m_unit_type == llvm::dwarf::DW_UT_skeleton)
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cu_sp->m_dwo_id = debug_info.GetU64(offset_ptr);
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} else {
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abbr_offset = debug_info.GetDWARFOffset(offset_ptr);
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cu_sp->m_addr_size = debug_info.GetU8(offset_ptr);
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}
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bool length_OK =
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debug_info.ValidOffset(cu_sp->GetNextCompileUnitOffset() - 1);
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bool version_OK = SymbolFileDWARF::SupportedVersion(cu_sp->m_version);
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bool abbr_offset_OK =
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dwarf2Data->get_debug_abbrev_data().ValidOffset(abbr_offset);
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bool addr_size_OK = (cu_sp->m_addr_size == 4) || (cu_sp->m_addr_size == 8);
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if (!length_OK)
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return llvm::make_error<llvm::object::GenericBinaryError>(
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"Invalid compile unit length");
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if (!version_OK)
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return llvm::make_error<llvm::object::GenericBinaryError>(
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"Unsupported compile unit version");
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if (!abbr_offset_OK)
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return llvm::make_error<llvm::object::GenericBinaryError>(
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"Abbreviation offset for compile unit is not valid");
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if (!addr_size_OK)
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return llvm::make_error<llvm::object::GenericBinaryError>(
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"Invalid compile unit address size");
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cu_sp->m_abbrevs = abbr->GetAbbreviationDeclarationSet(abbr_offset);
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if (!cu_sp->m_abbrevs)
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return llvm::make_error<llvm::object::GenericBinaryError>(
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"No abbrev exists at the specified offset.");
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return cu_sp;
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}
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void DWARFCompileUnit::Dump(Stream *s) const {
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s->Printf("0x%8.8x: Compile Unit: length = 0x%8.8x, version = 0x%4.4x, "
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"abbr_offset = 0x%8.8x, addr_size = 0x%2.2x (next CU at "
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"{0x%8.8x})\n",
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m_offset, m_length, m_version, GetAbbrevOffset(), m_addr_size,
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GetNextCompileUnitOffset());
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}
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uint32_t DWARFCompileUnit::GetHeaderByteSize() const {
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if (m_version < 5)
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return 11;
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switch (m_unit_type) {
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case llvm::dwarf::DW_UT_compile:
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case llvm::dwarf::DW_UT_partial:
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return 12;
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case llvm::dwarf::DW_UT_skeleton:
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case llvm::dwarf::DW_UT_split_compile:
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return 20;
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case llvm::dwarf::DW_UT_type:
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case llvm::dwarf::DW_UT_split_type:
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return 24;
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}
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llvm_unreachable("invalid UnitType.");
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}
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const lldb_private::DWARFDataExtractor &DWARFCompileUnit::GetData() const {
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return m_dwarf->get_debug_info_data();
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}
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