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970 lines
32 KiB
970 lines
32 KiB
4 months ago
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//===-- DWARFUnit.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 "DWARFUnit.h"
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#include "lldb/Core/Module.h"
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#include "lldb/Host/StringConvert.h"
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#include "lldb/Symbol/ObjectFile.h"
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#include "lldb/Utility/LLDBAssert.h"
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#include "lldb/Utility/StreamString.h"
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#include "lldb/Utility/Timer.h"
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#include "llvm/Object/Error.h"
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#include "DWARFCompileUnit.h"
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#include "DWARFDebugAranges.h"
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#include "DWARFDebugInfo.h"
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#include "DWARFTypeUnit.h"
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#include "LogChannelDWARF.h"
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#include "SymbolFileDWARFDwo.h"
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using namespace lldb;
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using namespace lldb_private;
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using namespace std;
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extern int g_verbose;
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DWARFUnit::DWARFUnit(SymbolFileDWARF &dwarf, lldb::user_id_t uid,
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const DWARFUnitHeader &header,
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const DWARFAbbreviationDeclarationSet &abbrevs,
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DIERef::Section section, bool is_dwo)
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: UserID(uid), m_dwarf(dwarf), m_header(header), m_abbrevs(&abbrevs),
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m_cancel_scopes(false), m_section(section), m_is_dwo(is_dwo) {}
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DWARFUnit::~DWARFUnit() = default;
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// Parses first DIE of a compile unit.
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void DWARFUnit::ExtractUnitDIEIfNeeded() {
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{
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llvm::sys::ScopedReader lock(m_first_die_mutex);
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if (m_first_die)
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return; // Already parsed
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}
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llvm::sys::ScopedWriter lock(m_first_die_mutex);
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if (m_first_die)
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return; // Already parsed
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static Timer::Category func_cat(LLVM_PRETTY_FUNCTION);
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Timer scoped_timer(func_cat, "%8.8x: DWARFUnit::ExtractUnitDIEIfNeeded()",
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GetOffset());
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// Set the offset to that of the first DIE and calculate the start of the
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// next compilation unit header.
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lldb::offset_t offset = GetFirstDIEOffset();
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// We are in our compile unit, parse starting at the offset we were told to
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// parse
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const DWARFDataExtractor &data = GetData();
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if (offset < GetNextUnitOffset() &&
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m_first_die.Extract(data, this, &offset)) {
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AddUnitDIE(m_first_die);
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return;
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}
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}
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// Parses a compile unit and indexes its DIEs if it hasn't already been done.
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// It will leave this compile unit extracted forever.
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void DWARFUnit::ExtractDIEsIfNeeded() {
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m_cancel_scopes = true;
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{
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llvm::sys::ScopedReader lock(m_die_array_mutex);
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if (!m_die_array.empty())
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return; // Already parsed
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}
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llvm::sys::ScopedWriter lock(m_die_array_mutex);
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if (!m_die_array.empty())
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return; // Already parsed
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ExtractDIEsRWLocked();
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}
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// Parses a compile unit and indexes its DIEs if it hasn't already been done.
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// It will clear this compile unit after returned instance gets out of scope,
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// no other ScopedExtractDIEs instance is running for this compile unit
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// and no ExtractDIEsIfNeeded() has been executed during this ScopedExtractDIEs
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// lifetime.
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DWARFUnit::ScopedExtractDIEs DWARFUnit::ExtractDIEsScoped() {
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ScopedExtractDIEs scoped(*this);
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{
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llvm::sys::ScopedReader lock(m_die_array_mutex);
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if (!m_die_array.empty())
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return scoped; // Already parsed
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}
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llvm::sys::ScopedWriter lock(m_die_array_mutex);
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if (!m_die_array.empty())
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return scoped; // Already parsed
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// Otherwise m_die_array would be already populated.
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lldbassert(!m_cancel_scopes);
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ExtractDIEsRWLocked();
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scoped.m_clear_dies = true;
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return scoped;
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}
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DWARFUnit::ScopedExtractDIEs::ScopedExtractDIEs(DWARFUnit &cu) : m_cu(&cu) {
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m_cu->m_die_array_scoped_mutex.lock_shared();
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}
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DWARFUnit::ScopedExtractDIEs::~ScopedExtractDIEs() {
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if (!m_cu)
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return;
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m_cu->m_die_array_scoped_mutex.unlock_shared();
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if (!m_clear_dies || m_cu->m_cancel_scopes)
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return;
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// Be sure no other ScopedExtractDIEs is running anymore.
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llvm::sys::ScopedWriter lock_scoped(m_cu->m_die_array_scoped_mutex);
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llvm::sys::ScopedWriter lock(m_cu->m_die_array_mutex);
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if (m_cu->m_cancel_scopes)
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return;
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m_cu->ClearDIEsRWLocked();
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}
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DWARFUnit::ScopedExtractDIEs::ScopedExtractDIEs(ScopedExtractDIEs &&rhs)
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: m_cu(rhs.m_cu), m_clear_dies(rhs.m_clear_dies) {
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rhs.m_cu = nullptr;
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}
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DWARFUnit::ScopedExtractDIEs &DWARFUnit::ScopedExtractDIEs::operator=(
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DWARFUnit::ScopedExtractDIEs &&rhs) {
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m_cu = rhs.m_cu;
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rhs.m_cu = nullptr;
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m_clear_dies = rhs.m_clear_dies;
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return *this;
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}
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// Parses a compile unit and indexes its DIEs, m_die_array_mutex must be
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// held R/W and m_die_array must be empty.
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void DWARFUnit::ExtractDIEsRWLocked() {
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llvm::sys::ScopedWriter first_die_lock(m_first_die_mutex);
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static Timer::Category func_cat(LLVM_PRETTY_FUNCTION);
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Timer scoped_timer(func_cat, "%8.8x: DWARFUnit::ExtractDIEsIfNeeded()",
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GetOffset());
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// Set the offset to that of the first DIE and calculate the start of the
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// next compilation unit header.
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lldb::offset_t offset = GetFirstDIEOffset();
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lldb::offset_t next_cu_offset = GetNextUnitOffset();
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DWARFDebugInfoEntry die;
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uint32_t depth = 0;
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// We are in our compile unit, parse starting at the offset we were told to
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// parse
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const DWARFDataExtractor &data = GetData();
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std::vector<uint32_t> die_index_stack;
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die_index_stack.reserve(32);
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die_index_stack.push_back(0);
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bool prev_die_had_children = false;
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while (offset < next_cu_offset && die.Extract(data, this, &offset)) {
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const bool null_die = die.IsNULL();
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if (depth == 0) {
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assert(m_die_array.empty() && "Compile unit DIE already added");
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// The average bytes per DIE entry has been seen to be around 14-20 so
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// lets pre-reserve half of that since we are now stripping the NULL
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// tags.
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// Only reserve the memory if we are adding children of the main
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// compile unit DIE. The compile unit DIE is always the first entry, so
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// if our size is 1, then we are adding the first compile unit child
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// DIE and should reserve the memory.
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m_die_array.reserve(GetDebugInfoSize() / 24);
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m_die_array.push_back(die);
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if (!m_first_die)
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AddUnitDIE(m_die_array.front());
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// With -fsplit-dwarf-inlining, clang will emit non-empty skeleton compile
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// units. We are not able to access these DIE *and* the dwo file
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// simultaneously. We also don't need to do that as the dwo file will
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// contain a superset of information. So, we don't even attempt to parse
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// any remaining DIEs.
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if (m_dwo) {
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m_die_array.front().SetHasChildren(false);
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break;
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}
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} else {
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if (null_die) {
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if (prev_die_had_children) {
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// This will only happen if a DIE says is has children but all it
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// contains is a NULL tag. Since we are removing the NULL DIEs from
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// the list (saves up to 25% in C++ code), we need a way to let the
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// DIE know that it actually doesn't have children.
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if (!m_die_array.empty())
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m_die_array.back().SetHasChildren(false);
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}
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} else {
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die.SetParentIndex(m_die_array.size() - die_index_stack[depth - 1]);
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if (die_index_stack.back())
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m_die_array[die_index_stack.back()].SetSiblingIndex(
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m_die_array.size() - die_index_stack.back());
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// Only push the DIE if it isn't a NULL DIE
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m_die_array.push_back(die);
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}
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}
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if (null_die) {
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// NULL DIE.
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if (!die_index_stack.empty())
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die_index_stack.pop_back();
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if (depth > 0)
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--depth;
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prev_die_had_children = false;
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} else {
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die_index_stack.back() = m_die_array.size() - 1;
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// Normal DIE
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const bool die_has_children = die.HasChildren();
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if (die_has_children) {
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die_index_stack.push_back(0);
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++depth;
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}
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prev_die_had_children = die_has_children;
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}
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if (depth == 0)
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break; // We are done with this compile unit!
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}
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if (!m_die_array.empty()) {
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if (m_first_die) {
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// Only needed for the assertion.
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m_first_die.SetHasChildren(m_die_array.front().HasChildren());
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lldbassert(m_first_die == m_die_array.front());
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}
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m_first_die = m_die_array.front();
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}
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m_die_array.shrink_to_fit();
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if (m_dwo)
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m_dwo->ExtractDIEsIfNeeded();
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}
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// This is used when a split dwarf is enabled.
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// A skeleton compilation unit may contain the DW_AT_str_offsets_base attribute
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// that points to the first string offset of the CU contribution to the
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// .debug_str_offsets. At the same time, the corresponding split debug unit also
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// may use DW_FORM_strx* forms pointing to its own .debug_str_offsets.dwo and
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// for that case, we should find the offset (skip the section header).
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void DWARFUnit::SetDwoStrOffsetsBase() {
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lldb::offset_t baseOffset = 0;
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if (const llvm::DWARFUnitIndex::Entry *entry = m_header.GetIndexEntry()) {
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if (const auto *contribution =
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entry->getContribution(llvm::DW_SECT_STR_OFFSETS))
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baseOffset = contribution->Offset;
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else
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return;
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}
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if (GetVersion() >= 5) {
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const DWARFDataExtractor &strOffsets =
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GetSymbolFileDWARF().GetDWARFContext().getOrLoadStrOffsetsData();
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uint64_t length = strOffsets.GetU32(&baseOffset);
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if (length == 0xffffffff)
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length = strOffsets.GetU64(&baseOffset);
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// Check version.
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if (strOffsets.GetU16(&baseOffset) < 5)
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return;
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// Skip padding.
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baseOffset += 2;
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}
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SetStrOffsetsBase(baseOffset);
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}
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// m_die_array_mutex must be already held as read/write.
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void DWARFUnit::AddUnitDIE(const DWARFDebugInfoEntry &cu_die) {
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llvm::Optional<uint64_t> addr_base, gnu_addr_base, ranges_base,
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gnu_ranges_base;
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DWARFAttributes attributes;
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size_t num_attributes = cu_die.GetAttributes(this, attributes);
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// Extract DW_AT_addr_base first, as other attributes may need it.
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for (size_t i = 0; i < num_attributes; ++i) {
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if (attributes.AttributeAtIndex(i) != DW_AT_addr_base)
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continue;
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DWARFFormValue form_value;
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if (attributes.ExtractFormValueAtIndex(i, form_value)) {
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addr_base = form_value.Unsigned();
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SetAddrBase(*addr_base);
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break;
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}
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}
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for (size_t i = 0; i < num_attributes; ++i) {
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dw_attr_t attr = attributes.AttributeAtIndex(i);
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DWARFFormValue form_value;
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if (!attributes.ExtractFormValueAtIndex(i, form_value))
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continue;
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switch (attr) {
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case DW_AT_loclists_base:
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SetLoclistsBase(form_value.Unsigned());
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break;
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case DW_AT_rnglists_base:
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ranges_base = form_value.Unsigned();
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SetRangesBase(*ranges_base);
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break;
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case DW_AT_str_offsets_base:
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SetStrOffsetsBase(form_value.Unsigned());
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break;
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case DW_AT_low_pc:
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SetBaseAddress(form_value.Address());
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break;
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case DW_AT_entry_pc:
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// If the value was already set by DW_AT_low_pc, don't update it.
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if (m_base_addr == LLDB_INVALID_ADDRESS)
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SetBaseAddress(form_value.Address());
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break;
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case DW_AT_stmt_list:
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m_line_table_offset = form_value.Unsigned();
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break;
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case DW_AT_GNU_addr_base:
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gnu_addr_base = form_value.Unsigned();
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break;
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case DW_AT_GNU_ranges_base:
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gnu_ranges_base = form_value.Unsigned();
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break;
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}
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}
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if (m_is_dwo) {
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SetDwoStrOffsetsBase();
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return;
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}
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std::shared_ptr<SymbolFileDWARFDwo> dwo_symbol_file =
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m_dwarf.GetDwoSymbolFileForCompileUnit(*this, cu_die);
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if (!dwo_symbol_file)
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return;
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uint64_t main_dwo_id =
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cu_die.GetAttributeValueAsUnsigned(this, DW_AT_GNU_dwo_id, 0);
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DWARFUnit *dwo_cu = dwo_symbol_file->GetDWOCompileUnitForHash(main_dwo_id);
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if (!dwo_cu)
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return; // Can't fetch the compile unit from the dwo file.
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dwo_cu->SetUserData(this);
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DWARFBaseDIE dwo_cu_die = dwo_cu->GetUnitDIEOnly();
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if (!dwo_cu_die.IsValid())
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return; // Can't fetch the compile unit DIE from the dwo file.
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// Here for DWO CU we want to use the address base set in the skeleton unit
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// (DW_AT_addr_base) if it is available and use the DW_AT_GNU_addr_base
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// otherwise. We do that because pre-DWARF v5 could use the DW_AT_GNU_*
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// attributes which were applicable to the DWO units. The corresponding
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// DW_AT_* attributes standardized in DWARF v5 are also applicable to the main
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// unit in contrast.
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if (addr_base)
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dwo_cu->SetAddrBase(*addr_base);
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else if (gnu_addr_base)
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dwo_cu->SetAddrBase(*gnu_addr_base);
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if (GetVersion() <= 4 && gnu_ranges_base)
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dwo_cu->SetRangesBase(*gnu_ranges_base);
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else if (dwo_symbol_file->GetDWARFContext()
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.getOrLoadRngListsData()
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.GetByteSize() > 0)
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dwo_cu->SetRangesBase(llvm::DWARFListTableHeader::getHeaderSize(DWARF32));
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if (GetVersion() >= 5 &&
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dwo_symbol_file->GetDWARFContext().getOrLoadLocListsData().GetByteSize() >
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0)
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dwo_cu->SetLoclistsBase(llvm::DWARFListTableHeader::getHeaderSize(DWARF32));
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dwo_cu->SetBaseAddress(GetBaseAddress());
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m_dwo = std::shared_ptr<DWARFUnit>(std::move(dwo_symbol_file), dwo_cu);
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}
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size_t DWARFUnit::GetDebugInfoSize() const {
|
||
|
return GetLengthByteSize() + GetLength() - GetHeaderByteSize();
|
||
|
}
|
||
|
|
||
|
const DWARFAbbreviationDeclarationSet *DWARFUnit::GetAbbreviations() const {
|
||
|
return m_abbrevs;
|
||
|
}
|
||
|
|
||
|
dw_offset_t DWARFUnit::GetAbbrevOffset() const {
|
||
|
return m_abbrevs ? m_abbrevs->GetOffset() : DW_INVALID_OFFSET;
|
||
|
}
|
||
|
|
||
|
dw_offset_t DWARFUnit::GetLineTableOffset() {
|
||
|
ExtractUnitDIEIfNeeded();
|
||
|
return m_line_table_offset;
|
||
|
}
|
||
|
|
||
|
void DWARFUnit::SetAddrBase(dw_addr_t addr_base) { m_addr_base = addr_base; }
|
||
|
|
||
|
// Parse the rangelist table header, including the optional array of offsets
|
||
|
// following it (DWARF v5 and later).
|
||
|
template <typename ListTableType>
|
||
|
static llvm::Expected<ListTableType>
|
||
|
ParseListTableHeader(const llvm::DWARFDataExtractor &data, uint64_t offset,
|
||
|
DwarfFormat format) {
|
||
|
// We are expected to be called with Offset 0 or pointing just past the table
|
||
|
// header. Correct Offset in the latter case so that it points to the start
|
||
|
// of the header.
|
||
|
if (offset > 0) {
|
||
|
uint64_t HeaderSize = llvm::DWARFListTableHeader::getHeaderSize(format);
|
||
|
if (offset < HeaderSize)
|
||
|
return llvm::createStringError(errc::invalid_argument,
|
||
|
"did not detect a valid"
|
||
|
" list table with base = 0x%" PRIx64 "\n",
|
||
|
offset);
|
||
|
offset -= HeaderSize;
|
||
|
}
|
||
|
ListTableType Table;
|
||
|
if (llvm::Error E = Table.extractHeaderAndOffsets(data, &offset))
|
||
|
return std::move(E);
|
||
|
return Table;
|
||
|
}
|
||
|
|
||
|
void DWARFUnit::SetLoclistsBase(dw_addr_t loclists_base) {
|
||
|
m_loclists_base = loclists_base;
|
||
|
|
||
|
uint64_t header_size = llvm::DWARFListTableHeader::getHeaderSize(DWARF32);
|
||
|
if (loclists_base < header_size)
|
||
|
return;
|
||
|
|
||
|
m_loclist_table_header.emplace(".debug_loclists", "locations");
|
||
|
uint64_t offset = loclists_base - header_size;
|
||
|
if (llvm::Error E = m_loclist_table_header->extract(
|
||
|
m_dwarf.GetDWARFContext().getOrLoadLocListsData().GetAsLLVM(),
|
||
|
&offset)) {
|
||
|
GetSymbolFileDWARF().GetObjectFile()->GetModule()->ReportError(
|
||
|
"Failed to extract location list table at offset 0x%" PRIx64 ": %s",
|
||
|
loclists_base, toString(std::move(E)).c_str());
|
||
|
}
|
||
|
}
|
||
|
|
||
|
std::unique_ptr<llvm::DWARFLocationTable>
|
||
|
DWARFUnit::GetLocationTable(const DataExtractor &data) const {
|
||
|
llvm::DWARFDataExtractor llvm_data(
|
||
|
data.GetData(), data.GetByteOrder() == lldb::eByteOrderLittle,
|
||
|
data.GetAddressByteSize());
|
||
|
|
||
|
if (m_is_dwo || GetVersion() >= 5)
|
||
|
return std::make_unique<llvm::DWARFDebugLoclists>(llvm_data, GetVersion());
|
||
|
return std::make_unique<llvm::DWARFDebugLoc>(llvm_data);
|
||
|
}
|
||
|
|
||
|
DWARFDataExtractor DWARFUnit::GetLocationData() const {
|
||
|
DWARFContext &Ctx = GetSymbolFileDWARF().GetDWARFContext();
|
||
|
const DWARFDataExtractor &data =
|
||
|
GetVersion() >= 5 ? Ctx.getOrLoadLocListsData() : Ctx.getOrLoadLocData();
|
||
|
if (const llvm::DWARFUnitIndex::Entry *entry = m_header.GetIndexEntry()) {
|
||
|
if (const auto *contribution = entry->getContribution(llvm::DW_SECT_EXT_LOC))
|
||
|
return DWARFDataExtractor(data, contribution->Offset,
|
||
|
contribution->Length);
|
||
|
return DWARFDataExtractor();
|
||
|
}
|
||
|
return data;
|
||
|
}
|
||
|
|
||
|
void DWARFUnit::SetRangesBase(dw_addr_t ranges_base) {
|
||
|
m_ranges_base = ranges_base;
|
||
|
|
||
|
if (GetVersion() < 5)
|
||
|
return;
|
||
|
|
||
|
if (auto table_or_error = ParseListTableHeader<llvm::DWARFDebugRnglistTable>(
|
||
|
m_dwarf.GetDWARFContext().getOrLoadRngListsData().GetAsLLVM(),
|
||
|
ranges_base, DWARF32))
|
||
|
m_rnglist_table = std::move(table_or_error.get());
|
||
|
else
|
||
|
GetSymbolFileDWARF().GetObjectFile()->GetModule()->ReportError(
|
||
|
"Failed to extract range list table at offset 0x%" PRIx64 ": %s",
|
||
|
ranges_base, toString(table_or_error.takeError()).c_str());
|
||
|
}
|
||
|
|
||
|
void DWARFUnit::SetStrOffsetsBase(dw_offset_t str_offsets_base) {
|
||
|
m_str_offsets_base = str_offsets_base;
|
||
|
}
|
||
|
|
||
|
// It may be called only with m_die_array_mutex held R/W.
|
||
|
void DWARFUnit::ClearDIEsRWLocked() {
|
||
|
m_die_array.clear();
|
||
|
m_die_array.shrink_to_fit();
|
||
|
|
||
|
if (m_dwo)
|
||
|
m_dwo->ClearDIEsRWLocked();
|
||
|
}
|
||
|
|
||
|
lldb::ByteOrder DWARFUnit::GetByteOrder() const {
|
||
|
return m_dwarf.GetObjectFile()->GetByteOrder();
|
||
|
}
|
||
|
|
||
|
void DWARFUnit::SetBaseAddress(dw_addr_t base_addr) { m_base_addr = base_addr; }
|
||
|
|
||
|
// Compare function DWARFDebugAranges::Range structures
|
||
|
static bool CompareDIEOffset(const DWARFDebugInfoEntry &die,
|
||
|
const dw_offset_t die_offset) {
|
||
|
return die.GetOffset() < die_offset;
|
||
|
}
|
||
|
|
||
|
// GetDIE()
|
||
|
//
|
||
|
// Get the DIE (Debug Information Entry) with the specified offset by first
|
||
|
// checking if the DIE is contained within this compile unit and grabbing the
|
||
|
// DIE from this compile unit. Otherwise we grab the DIE from the DWARF file.
|
||
|
DWARFDIE
|
||
|
DWARFUnit::GetDIE(dw_offset_t die_offset) {
|
||
|
if (die_offset == DW_INVALID_OFFSET)
|
||
|
return DWARFDIE(); // Not found
|
||
|
|
||
|
if (!ContainsDIEOffset(die_offset)) {
|
||
|
GetSymbolFileDWARF().GetObjectFile()->GetModule()->ReportError(
|
||
|
"GetDIE for DIE 0x%" PRIx32 " is outside of its CU 0x%" PRIx32,
|
||
|
die_offset, GetOffset());
|
||
|
return DWARFDIE(); // Not found
|
||
|
}
|
||
|
|
||
|
ExtractDIEsIfNeeded();
|
||
|
DWARFDebugInfoEntry::const_iterator end = m_die_array.cend();
|
||
|
DWARFDebugInfoEntry::const_iterator pos =
|
||
|
lower_bound(m_die_array.cbegin(), end, die_offset, CompareDIEOffset);
|
||
|
|
||
|
if (pos != end && die_offset == (*pos).GetOffset())
|
||
|
return DWARFDIE(this, &(*pos));
|
||
|
return DWARFDIE(); // Not found
|
||
|
}
|
||
|
|
||
|
DWARFUnit &DWARFUnit::GetNonSkeletonUnit() {
|
||
|
ExtractUnitDIEIfNeeded();
|
||
|
if (m_dwo)
|
||
|
return *m_dwo;
|
||
|
return *this;
|
||
|
}
|
||
|
|
||
|
uint8_t DWARFUnit::GetAddressByteSize(const DWARFUnit *cu) {
|
||
|
if (cu)
|
||
|
return cu->GetAddressByteSize();
|
||
|
return DWARFUnit::GetDefaultAddressSize();
|
||
|
}
|
||
|
|
||
|
uint8_t DWARFUnit::GetDefaultAddressSize() { return 4; }
|
||
|
|
||
|
void *DWARFUnit::GetUserData() const { return m_user_data; }
|
||
|
|
||
|
void DWARFUnit::SetUserData(void *d) { m_user_data = d; }
|
||
|
|
||
|
bool DWARFUnit::Supports_DW_AT_APPLE_objc_complete_type() {
|
||
|
return GetProducer() != eProducerLLVMGCC;
|
||
|
}
|
||
|
|
||
|
bool DWARFUnit::DW_AT_decl_file_attributes_are_invalid() {
|
||
|
// llvm-gcc makes completely invalid decl file attributes and won't ever be
|
||
|
// fixed, so we need to know to ignore these.
|
||
|
return GetProducer() == eProducerLLVMGCC;
|
||
|
}
|
||
|
|
||
|
bool DWARFUnit::Supports_unnamed_objc_bitfields() {
|
||
|
if (GetProducer() == eProducerClang) {
|
||
|
const uint32_t major_version = GetProducerVersionMajor();
|
||
|
return major_version > 425 ||
|
||
|
(major_version == 425 && GetProducerVersionUpdate() >= 13);
|
||
|
}
|
||
|
return true; // Assume all other compilers didn't have incorrect ObjC bitfield
|
||
|
// info
|
||
|
}
|
||
|
|
||
|
void DWARFUnit::ParseProducerInfo() {
|
||
|
m_producer_version_major = UINT32_MAX;
|
||
|
m_producer_version_minor = UINT32_MAX;
|
||
|
m_producer_version_update = UINT32_MAX;
|
||
|
|
||
|
const DWARFDebugInfoEntry *die = GetUnitDIEPtrOnly();
|
||
|
if (die) {
|
||
|
|
||
|
const char *producer_cstr =
|
||
|
die->GetAttributeValueAsString(this, DW_AT_producer, nullptr);
|
||
|
if (producer_cstr) {
|
||
|
RegularExpression llvm_gcc_regex(
|
||
|
llvm::StringRef("^4\\.[012]\\.[01] \\(Based on Apple "
|
||
|
"Inc\\. build [0-9]+\\) \\(LLVM build "
|
||
|
"[\\.0-9]+\\)$"));
|
||
|
if (llvm_gcc_regex.Execute(llvm::StringRef(producer_cstr))) {
|
||
|
m_producer = eProducerLLVMGCC;
|
||
|
} else if (strstr(producer_cstr, "clang")) {
|
||
|
static RegularExpression g_clang_version_regex(
|
||
|
llvm::StringRef("clang-([0-9]+)\\.([0-9]+)\\.([0-9]+)"));
|
||
|
llvm::SmallVector<llvm::StringRef, 4> matches;
|
||
|
if (g_clang_version_regex.Execute(llvm::StringRef(producer_cstr),
|
||
|
&matches)) {
|
||
|
m_producer_version_major =
|
||
|
StringConvert::ToUInt32(matches[1].str().c_str(), UINT32_MAX, 10);
|
||
|
m_producer_version_minor =
|
||
|
StringConvert::ToUInt32(matches[2].str().c_str(), UINT32_MAX, 10);
|
||
|
m_producer_version_update =
|
||
|
StringConvert::ToUInt32(matches[3].str().c_str(), UINT32_MAX, 10);
|
||
|
}
|
||
|
m_producer = eProducerClang;
|
||
|
} else if (strstr(producer_cstr, "GNU"))
|
||
|
m_producer = eProducerGCC;
|
||
|
}
|
||
|
}
|
||
|
if (m_producer == eProducerInvalid)
|
||
|
m_producer = eProcucerOther;
|
||
|
}
|
||
|
|
||
|
DWARFProducer DWARFUnit::GetProducer() {
|
||
|
if (m_producer == eProducerInvalid)
|
||
|
ParseProducerInfo();
|
||
|
return m_producer;
|
||
|
}
|
||
|
|
||
|
uint32_t DWARFUnit::GetProducerVersionMajor() {
|
||
|
if (m_producer_version_major == 0)
|
||
|
ParseProducerInfo();
|
||
|
return m_producer_version_major;
|
||
|
}
|
||
|
|
||
|
uint32_t DWARFUnit::GetProducerVersionMinor() {
|
||
|
if (m_producer_version_minor == 0)
|
||
|
ParseProducerInfo();
|
||
|
return m_producer_version_minor;
|
||
|
}
|
||
|
|
||
|
uint32_t DWARFUnit::GetProducerVersionUpdate() {
|
||
|
if (m_producer_version_update == 0)
|
||
|
ParseProducerInfo();
|
||
|
return m_producer_version_update;
|
||
|
}
|
||
|
|
||
|
uint64_t DWARFUnit::GetDWARFLanguageType() {
|
||
|
if (m_language_type)
|
||
|
return *m_language_type;
|
||
|
|
||
|
const DWARFDebugInfoEntry *die = GetUnitDIEPtrOnly();
|
||
|
if (!die)
|
||
|
m_language_type = 0;
|
||
|
else
|
||
|
m_language_type = die->GetAttributeValueAsUnsigned(this, DW_AT_language, 0);
|
||
|
return *m_language_type;
|
||
|
}
|
||
|
|
||
|
bool DWARFUnit::GetIsOptimized() {
|
||
|
if (m_is_optimized == eLazyBoolCalculate) {
|
||
|
const DWARFDebugInfoEntry *die = GetUnitDIEPtrOnly();
|
||
|
if (die) {
|
||
|
m_is_optimized = eLazyBoolNo;
|
||
|
if (die->GetAttributeValueAsUnsigned(this, DW_AT_APPLE_optimized, 0) ==
|
||
|
1) {
|
||
|
m_is_optimized = eLazyBoolYes;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
return m_is_optimized == eLazyBoolYes;
|
||
|
}
|
||
|
|
||
|
FileSpec::Style DWARFUnit::GetPathStyle() {
|
||
|
if (!m_comp_dir)
|
||
|
ComputeCompDirAndGuessPathStyle();
|
||
|
return m_comp_dir->GetPathStyle();
|
||
|
}
|
||
|
|
||
|
const FileSpec &DWARFUnit::GetCompilationDirectory() {
|
||
|
if (!m_comp_dir)
|
||
|
ComputeCompDirAndGuessPathStyle();
|
||
|
return *m_comp_dir;
|
||
|
}
|
||
|
|
||
|
const FileSpec &DWARFUnit::GetAbsolutePath() {
|
||
|
if (!m_file_spec)
|
||
|
ComputeAbsolutePath();
|
||
|
return *m_file_spec;
|
||
|
}
|
||
|
|
||
|
FileSpec DWARFUnit::GetFile(size_t file_idx) {
|
||
|
return m_dwarf.GetFile(*this, file_idx);
|
||
|
}
|
||
|
|
||
|
// DWARF2/3 suggests the form hostname:pathname for compilation directory.
|
||
|
// Remove the host part if present.
|
||
|
static llvm::StringRef
|
||
|
removeHostnameFromPathname(llvm::StringRef path_from_dwarf) {
|
||
|
if (!path_from_dwarf.contains(':'))
|
||
|
return path_from_dwarf;
|
||
|
llvm::StringRef host, path;
|
||
|
std::tie(host, path) = path_from_dwarf.split(':');
|
||
|
|
||
|
if (host.contains('/'))
|
||
|
return path_from_dwarf;
|
||
|
|
||
|
// check whether we have a windows path, and so the first character is a
|
||
|
// drive-letter not a hostname.
|
||
|
if (host.size() == 1 && llvm::isAlpha(host[0]) && path.startswith("\\"))
|
||
|
return path_from_dwarf;
|
||
|
|
||
|
return path;
|
||
|
}
|
||
|
|
||
|
void DWARFUnit::ComputeCompDirAndGuessPathStyle() {
|
||
|
m_comp_dir = FileSpec();
|
||
|
const DWARFDebugInfoEntry *die = GetUnitDIEPtrOnly();
|
||
|
if (!die)
|
||
|
return;
|
||
|
|
||
|
llvm::StringRef comp_dir = removeHostnameFromPathname(
|
||
|
die->GetAttributeValueAsString(this, DW_AT_comp_dir, nullptr));
|
||
|
if (!comp_dir.empty()) {
|
||
|
FileSpec::Style comp_dir_style =
|
||
|
FileSpec::GuessPathStyle(comp_dir).getValueOr(FileSpec::Style::native);
|
||
|
m_comp_dir = FileSpec(comp_dir, comp_dir_style);
|
||
|
} else {
|
||
|
// Try to detect the style based on the DW_AT_name attribute, but just store
|
||
|
// the detected style in the m_comp_dir field.
|
||
|
const char *name =
|
||
|
die->GetAttributeValueAsString(this, DW_AT_name, nullptr);
|
||
|
m_comp_dir = FileSpec(
|
||
|
"", FileSpec::GuessPathStyle(name).getValueOr(FileSpec::Style::native));
|
||
|
}
|
||
|
}
|
||
|
|
||
|
void DWARFUnit::ComputeAbsolutePath() {
|
||
|
m_file_spec = FileSpec();
|
||
|
const DWARFDebugInfoEntry *die = GetUnitDIEPtrOnly();
|
||
|
if (!die)
|
||
|
return;
|
||
|
|
||
|
m_file_spec =
|
||
|
FileSpec(die->GetAttributeValueAsString(this, DW_AT_name, nullptr),
|
||
|
GetPathStyle());
|
||
|
|
||
|
if (m_file_spec->IsRelative())
|
||
|
m_file_spec->MakeAbsolute(GetCompilationDirectory());
|
||
|
}
|
||
|
|
||
|
SymbolFileDWARFDwo *DWARFUnit::GetDwoSymbolFile() {
|
||
|
ExtractUnitDIEIfNeeded();
|
||
|
if (m_dwo)
|
||
|
return &llvm::cast<SymbolFileDWARFDwo>(m_dwo->GetSymbolFileDWARF());
|
||
|
return nullptr;
|
||
|
}
|
||
|
|
||
|
const DWARFDebugAranges &DWARFUnit::GetFunctionAranges() {
|
||
|
if (m_func_aranges_up == nullptr) {
|
||
|
m_func_aranges_up = std::make_unique<DWARFDebugAranges>();
|
||
|
const DWARFDebugInfoEntry *die = DIEPtr();
|
||
|
if (die)
|
||
|
die->BuildFunctionAddressRangeTable(this, m_func_aranges_up.get());
|
||
|
|
||
|
if (m_dwo) {
|
||
|
const DWARFDebugInfoEntry *dwo_die = m_dwo->DIEPtr();
|
||
|
if (dwo_die)
|
||
|
dwo_die->BuildFunctionAddressRangeTable(m_dwo.get(),
|
||
|
m_func_aranges_up.get());
|
||
|
}
|
||
|
|
||
|
const bool minimize = false;
|
||
|
m_func_aranges_up->Sort(minimize);
|
||
|
}
|
||
|
return *m_func_aranges_up;
|
||
|
}
|
||
|
|
||
|
llvm::Expected<DWARFUnitHeader>
|
||
|
DWARFUnitHeader::extract(const DWARFDataExtractor &data,
|
||
|
DIERef::Section section, lldb::offset_t *offset_ptr,
|
||
|
const llvm::DWARFUnitIndex *index) {
|
||
|
DWARFUnitHeader header;
|
||
|
header.m_offset = *offset_ptr;
|
||
|
if (index)
|
||
|
header.m_index_entry = index->getFromOffset(*offset_ptr);
|
||
|
header.m_length = data.GetDWARFInitialLength(offset_ptr);
|
||
|
header.m_version = data.GetU16(offset_ptr);
|
||
|
if (header.m_version == 5) {
|
||
|
header.m_unit_type = data.GetU8(offset_ptr);
|
||
|
header.m_addr_size = data.GetU8(offset_ptr);
|
||
|
header.m_abbr_offset = data.GetDWARFOffset(offset_ptr);
|
||
|
if (header.m_unit_type == llvm::dwarf::DW_UT_skeleton)
|
||
|
header.m_dwo_id = data.GetU64(offset_ptr);
|
||
|
} else {
|
||
|
header.m_abbr_offset = data.GetDWARFOffset(offset_ptr);
|
||
|
header.m_addr_size = data.GetU8(offset_ptr);
|
||
|
header.m_unit_type =
|
||
|
section == DIERef::Section::DebugTypes ? DW_UT_type : DW_UT_compile;
|
||
|
}
|
||
|
|
||
|
if (header.m_index_entry) {
|
||
|
if (header.m_abbr_offset) {
|
||
|
return llvm::createStringError(
|
||
|
llvm::inconvertibleErrorCode(),
|
||
|
"Package unit with a non-zero abbreviation offset");
|
||
|
}
|
||
|
auto *unit_contrib = header.m_index_entry->getContribution();
|
||
|
if (!unit_contrib || unit_contrib->Length != header.m_length + 4) {
|
||
|
return llvm::createStringError(llvm::inconvertibleErrorCode(),
|
||
|
"Inconsistent DWARF package unit index");
|
||
|
}
|
||
|
auto *abbr_entry =
|
||
|
header.m_index_entry->getContribution(llvm::DW_SECT_ABBREV);
|
||
|
if (!abbr_entry) {
|
||
|
return llvm::createStringError(
|
||
|
llvm::inconvertibleErrorCode(),
|
||
|
"DWARF package index missing abbreviation column");
|
||
|
}
|
||
|
header.m_abbr_offset = abbr_entry->Offset;
|
||
|
}
|
||
|
if (header.IsTypeUnit()) {
|
||
|
header.m_type_hash = data.GetU64(offset_ptr);
|
||
|
header.m_type_offset = data.GetDWARFOffset(offset_ptr);
|
||
|
}
|
||
|
|
||
|
bool length_OK = data.ValidOffset(header.GetNextUnitOffset() - 1);
|
||
|
bool version_OK = SymbolFileDWARF::SupportedVersion(header.m_version);
|
||
|
bool addr_size_OK = (header.m_addr_size == 4) || (header.m_addr_size == 8);
|
||
|
bool type_offset_OK =
|
||
|
!header.IsTypeUnit() || (header.m_type_offset <= header.GetLength());
|
||
|
|
||
|
if (!length_OK)
|
||
|
return llvm::make_error<llvm::object::GenericBinaryError>(
|
||
|
"Invalid unit length");
|
||
|
if (!version_OK)
|
||
|
return llvm::make_error<llvm::object::GenericBinaryError>(
|
||
|
"Unsupported unit version");
|
||
|
if (!addr_size_OK)
|
||
|
return llvm::make_error<llvm::object::GenericBinaryError>(
|
||
|
"Invalid unit address size");
|
||
|
if (!type_offset_OK)
|
||
|
return llvm::make_error<llvm::object::GenericBinaryError>(
|
||
|
"Type offset out of range");
|
||
|
|
||
|
return header;
|
||
|
}
|
||
|
|
||
|
llvm::Expected<DWARFUnitSP>
|
||
|
DWARFUnit::extract(SymbolFileDWARF &dwarf, user_id_t uid,
|
||
|
const DWARFDataExtractor &debug_info,
|
||
|
DIERef::Section section, lldb::offset_t *offset_ptr,
|
||
|
const llvm::DWARFUnitIndex *index) {
|
||
|
assert(debug_info.ValidOffset(*offset_ptr));
|
||
|
|
||
|
auto expected_header =
|
||
|
DWARFUnitHeader::extract(debug_info, section, offset_ptr, index);
|
||
|
if (!expected_header)
|
||
|
return expected_header.takeError();
|
||
|
|
||
|
const DWARFDebugAbbrev *abbr = dwarf.DebugAbbrev();
|
||
|
if (!abbr)
|
||
|
return llvm::make_error<llvm::object::GenericBinaryError>(
|
||
|
"No debug_abbrev data");
|
||
|
|
||
|
bool abbr_offset_OK =
|
||
|
dwarf.GetDWARFContext().getOrLoadAbbrevData().ValidOffset(
|
||
|
expected_header->GetAbbrOffset());
|
||
|
if (!abbr_offset_OK)
|
||
|
return llvm::make_error<llvm::object::GenericBinaryError>(
|
||
|
"Abbreviation offset for unit is not valid");
|
||
|
|
||
|
const DWARFAbbreviationDeclarationSet *abbrevs =
|
||
|
abbr->GetAbbreviationDeclarationSet(expected_header->GetAbbrOffset());
|
||
|
if (!abbrevs)
|
||
|
return llvm::make_error<llvm::object::GenericBinaryError>(
|
||
|
"No abbrev exists at the specified offset.");
|
||
|
|
||
|
bool is_dwo = dwarf.GetDWARFContext().isDwo();
|
||
|
if (expected_header->IsTypeUnit())
|
||
|
return DWARFUnitSP(new DWARFTypeUnit(dwarf, uid, *expected_header, *abbrevs,
|
||
|
section, is_dwo));
|
||
|
return DWARFUnitSP(new DWARFCompileUnit(dwarf, uid, *expected_header,
|
||
|
*abbrevs, section, is_dwo));
|
||
|
}
|
||
|
|
||
|
const lldb_private::DWARFDataExtractor &DWARFUnit::GetData() const {
|
||
|
return m_section == DIERef::Section::DebugTypes
|
||
|
? m_dwarf.GetDWARFContext().getOrLoadDebugTypesData()
|
||
|
: m_dwarf.GetDWARFContext().getOrLoadDebugInfoData();
|
||
|
}
|
||
|
|
||
|
uint32_t DWARFUnit::GetHeaderByteSize() const {
|
||
|
switch (m_header.GetUnitType()) {
|
||
|
case llvm::dwarf::DW_UT_compile:
|
||
|
case llvm::dwarf::DW_UT_partial:
|
||
|
return GetVersion() < 5 ? 11 : 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 GetVersion() < 5 ? 23 : 24;
|
||
|
}
|
||
|
llvm_unreachable("invalid UnitType.");
|
||
|
}
|
||
|
|
||
|
llvm::Optional<uint64_t>
|
||
|
DWARFUnit::GetStringOffsetSectionItem(uint32_t index) const {
|
||
|
offset_t offset = GetStrOffsetsBase() + index * 4;
|
||
|
return m_dwarf.GetDWARFContext().getOrLoadStrOffsetsData().GetU32(&offset);
|
||
|
}
|
||
|
|
||
|
llvm::Expected<DWARFRangeList>
|
||
|
DWARFUnit::FindRnglistFromOffset(dw_offset_t offset) {
|
||
|
if (GetVersion() <= 4) {
|
||
|
const DWARFDebugRanges *debug_ranges = m_dwarf.GetDebugRanges();
|
||
|
if (!debug_ranges)
|
||
|
return llvm::make_error<llvm::object::GenericBinaryError>(
|
||
|
"No debug_ranges section");
|
||
|
DWARFRangeList ranges;
|
||
|
debug_ranges->FindRanges(this, offset, ranges);
|
||
|
return ranges;
|
||
|
}
|
||
|
|
||
|
if (!m_rnglist_table)
|
||
|
return llvm::createStringError(errc::invalid_argument,
|
||
|
"missing or invalid range list table");
|
||
|
|
||
|
auto range_list_or_error = m_rnglist_table->findList(
|
||
|
m_dwarf.GetDWARFContext().getOrLoadRngListsData().GetAsLLVM(), offset);
|
||
|
if (!range_list_or_error)
|
||
|
return range_list_or_error.takeError();
|
||
|
|
||
|
llvm::Expected<llvm::DWARFAddressRangesVector> llvm_ranges =
|
||
|
range_list_or_error->getAbsoluteRanges(
|
||
|
llvm::object::SectionedAddress{GetBaseAddress()},
|
||
|
GetAddressByteSize(), [&](uint32_t index) {
|
||
|
uint32_t index_size = GetAddressByteSize();
|
||
|
dw_offset_t addr_base = GetAddrBase();
|
||
|
lldb::offset_t offset = addr_base + index * index_size;
|
||
|
return llvm::object::SectionedAddress{
|
||
|
m_dwarf.GetDWARFContext().getOrLoadAddrData().GetMaxU64(
|
||
|
&offset, index_size)};
|
||
|
});
|
||
|
if (!llvm_ranges)
|
||
|
return llvm_ranges.takeError();
|
||
|
|
||
|
DWARFRangeList ranges;
|
||
|
for (const llvm::DWARFAddressRange &llvm_range : *llvm_ranges) {
|
||
|
ranges.Append(DWARFRangeList::Entry(llvm_range.LowPC,
|
||
|
llvm_range.HighPC - llvm_range.LowPC));
|
||
|
}
|
||
|
return ranges;
|
||
|
}
|
||
|
|
||
|
llvm::Expected<DWARFRangeList>
|
||
|
DWARFUnit::FindRnglistFromIndex(uint32_t index) {
|
||
|
if (llvm::Optional<uint64_t> offset = GetRnglistOffset(index))
|
||
|
return FindRnglistFromOffset(*offset);
|
||
|
if (m_rnglist_table)
|
||
|
return llvm::createStringError(errc::invalid_argument,
|
||
|
"invalid range list table index %d", index);
|
||
|
|
||
|
return llvm::createStringError(errc::invalid_argument,
|
||
|
"missing or invalid range list table");
|
||
|
}
|