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//===-- DWARFUnit.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 "DWARFUnit.h"
#include "lldb/Core/Module.h"
#include "lldb/Host/StringConvert.h"
#include "lldb/Symbol/CompileUnit.h"
#include "lldb/Symbol/LineTable.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Utility/LLDBAssert.h"
#include "lldb/Utility/StreamString.h"
#include "lldb/Utility/Timer.h"
#include "DWARFDebugAranges.h"
#include "DWARFDebugInfo.h"
#include "LogChannelDWARF.h"
#include "SymbolFileDWARFDebugMap.h"
#include "SymbolFileDWARFDwo.h"
using namespace lldb;
using namespace lldb_private;
using namespace std;
extern int g_verbose;
DWARFUnit::DWARFUnit(SymbolFileDWARF *dwarf, user_id_t uid)
: UserID(uid), m_dwarf(dwarf), m_cancel_scopes(false) {}
DWARFUnit::~DWARFUnit() {}
// Parses first DIE of a compile unit.
void DWARFUnit::ExtractUnitDIEIfNeeded() {
{
llvm::sys::ScopedReader lock(m_first_die_mutex);
if (m_first_die)
return; // Already parsed
}
llvm::sys::ScopedWriter lock(m_first_die_mutex);
if (m_first_die)
return; // Already parsed
static Timer::Category func_cat(LLVM_PRETTY_FUNCTION);
Timer scoped_timer(
func_cat, "%8.8x: DWARFUnit::ExtractUnitDIEIfNeeded()", m_offset);
// Set the offset to that of the first DIE and calculate the start of the
// next compilation unit header.
lldb::offset_t offset = GetFirstDIEOffset();
// We are in our compile unit, parse starting at the offset we were told to
// parse
const DWARFDataExtractor &data = GetData();
DWARFFormValue::FixedFormSizes fixed_form_sizes =
DWARFFormValue::GetFixedFormSizesForAddressSize(GetAddressByteSize());
if (offset < GetNextUnitOffset() &&
m_first_die.FastExtract(data, this, fixed_form_sizes, &offset)) {
AddUnitDIE(m_first_die);
return;
}
}
// Parses a compile unit and indexes its DIEs if it hasn't already been done.
// It will leave this compile unit extracted forever.
void DWARFUnit::ExtractDIEsIfNeeded() {
m_cancel_scopes = true;
{
llvm::sys::ScopedReader lock(m_die_array_mutex);
if (!m_die_array.empty())
return; // Already parsed
}
llvm::sys::ScopedWriter lock(m_die_array_mutex);
if (!m_die_array.empty())
return; // Already parsed
ExtractDIEsRWLocked();
}
// Parses a compile unit and indexes its DIEs if it hasn't already been done.
// It will clear this compile unit after returned instance gets out of scope,
// no other ScopedExtractDIEs instance is running for this compile unit
// and no ExtractDIEsIfNeeded() has been executed during this ScopedExtractDIEs
// lifetime.
DWARFUnit::ScopedExtractDIEs DWARFUnit::ExtractDIEsScoped() {
ScopedExtractDIEs scoped(this);
{
llvm::sys::ScopedReader lock(m_die_array_mutex);
if (!m_die_array.empty())
return scoped; // Already parsed
}
llvm::sys::ScopedWriter lock(m_die_array_mutex);
if (!m_die_array.empty())
return scoped; // Already parsed
// Otherwise m_die_array would be already populated.
lldbassert(!m_cancel_scopes);
ExtractDIEsRWLocked();
scoped.m_clear_dies = true;
return scoped;
}
DWARFUnit::ScopedExtractDIEs::ScopedExtractDIEs(DWARFUnit *cu) : m_cu(cu) {
lldbassert(m_cu);
m_cu->m_die_array_scoped_mutex.lock_shared();
}
DWARFUnit::ScopedExtractDIEs::~ScopedExtractDIEs() {
if (!m_cu)
return;
m_cu->m_die_array_scoped_mutex.unlock_shared();
if (!m_clear_dies || m_cu->m_cancel_scopes)
return;
// Be sure no other ScopedExtractDIEs is running anymore.
llvm::sys::ScopedWriter lock_scoped(m_cu->m_die_array_scoped_mutex);
llvm::sys::ScopedWriter lock(m_cu->m_die_array_mutex);
if (m_cu->m_cancel_scopes)
return;
m_cu->ClearDIEsRWLocked();
}
DWARFUnit::ScopedExtractDIEs::ScopedExtractDIEs(ScopedExtractDIEs &&rhs)
: m_cu(rhs.m_cu), m_clear_dies(rhs.m_clear_dies) {
rhs.m_cu = nullptr;
}
DWARFUnit::ScopedExtractDIEs &DWARFUnit::ScopedExtractDIEs::operator=(
DWARFUnit::ScopedExtractDIEs &&rhs) {
m_cu = rhs.m_cu;
rhs.m_cu = nullptr;
m_clear_dies = rhs.m_clear_dies;
return *this;
}
// Parses a compile unit and indexes its DIEs, m_die_array_mutex must be
// held R/W and m_die_array must be empty.
void DWARFUnit::ExtractDIEsRWLocked() {
llvm::sys::ScopedWriter first_die_lock(m_first_die_mutex);
static Timer::Category func_cat(LLVM_PRETTY_FUNCTION);
Timer scoped_timer(
func_cat, "%8.8x: DWARFUnit::ExtractDIEsIfNeeded()", m_offset);
// Set the offset to that of the first DIE and calculate the start of the
// next compilation unit header.
lldb::offset_t offset = GetFirstDIEOffset();
lldb::offset_t next_cu_offset = GetNextUnitOffset();
DWARFDebugInfoEntry die;
uint32_t depth = 0;
// We are in our compile unit, parse starting at the offset we were told to
// parse
const DWARFDataExtractor &data = GetData();
std::vector<uint32_t> die_index_stack;
die_index_stack.reserve(32);
die_index_stack.push_back(0);
bool prev_die_had_children = false;
DWARFFormValue::FixedFormSizes fixed_form_sizes =
DWARFFormValue::GetFixedFormSizesForAddressSize(GetAddressByteSize());
while (offset < next_cu_offset &&
die.FastExtract(data, this, fixed_form_sizes, &offset)) {
const bool null_die = die.IsNULL();
if (depth == 0) {
assert(m_die_array.empty() && "Compile unit DIE already added");
// The average bytes per DIE entry has been seen to be around 14-20 so
// lets pre-reserve half of that since we are now stripping the NULL
// tags.
// Only reserve the memory if we are adding children of the main
// compile unit DIE. The compile unit DIE is always the first entry, so
// if our size is 1, then we are adding the first compile unit child
// DIE and should reserve the memory.
m_die_array.reserve(GetDebugInfoSize() / 24);
m_die_array.push_back(die);
if (!m_first_die)
AddUnitDIE(m_die_array.front());
} else {
if (null_die) {
if (prev_die_had_children) {
// This will only happen if a DIE says is has children but all it
// contains is a NULL tag. Since we are removing the NULL DIEs from
// the list (saves up to 25% in C++ code), we need a way to let the
// DIE know that it actually doesn't have children.
if (!m_die_array.empty())
m_die_array.back().SetHasChildren(false);
}
} else {
die.SetParentIndex(m_die_array.size() - die_index_stack[depth - 1]);
if (die_index_stack.back())
m_die_array[die_index_stack.back()].SetSiblingIndex(
m_die_array.size() - die_index_stack.back());
// Only push the DIE if it isn't a NULL DIE
m_die_array.push_back(die);
}
}
if (null_die) {
// NULL DIE.
if (!die_index_stack.empty())
die_index_stack.pop_back();
if (depth > 0)
--depth;
prev_die_had_children = false;
} else {
die_index_stack.back() = m_die_array.size() - 1;
// Normal DIE
const bool die_has_children = die.HasChildren();
if (die_has_children) {
die_index_stack.push_back(0);
++depth;
}
prev_die_had_children = die_has_children;
}
if (depth == 0)
break; // We are done with this compile unit!
}
if (!m_die_array.empty()) {
if (m_first_die) {
// Only needed for the assertion.
m_first_die.SetHasChildren(m_die_array.front().HasChildren());
lldbassert(m_first_die == m_die_array.front());
}
m_first_die = m_die_array.front();
}
m_die_array.shrink_to_fit();
if (m_dwo_symbol_file) {
DWARFUnit *dwo_cu = m_dwo_symbol_file->GetCompileUnit();
dwo_cu->ExtractDIEsIfNeeded();
}
}
// This is used when a split dwarf is enabled.
// A skeleton compilation unit may contain the DW_AT_str_offsets_base attribute
// that points to the first string offset of the CU contribution to the
// .debug_str_offsets. At the same time, the corresponding split debug unit also
// may use DW_FORM_strx* forms pointing to its own .debug_str_offsets.dwo and
// for that case, we should find the offset (skip the section header).
static void SetDwoStrOffsetsBase(DWARFUnit *dwo_cu) {
lldb::offset_t baseOffset = 0;
const DWARFDataExtractor &strOffsets =
dwo_cu->GetSymbolFileDWARF()->get_debug_str_offsets_data();
uint64_t length = strOffsets.GetU32(&baseOffset);
if (length == 0xffffffff)
length = strOffsets.GetU64(&baseOffset);
// Check version.
if (strOffsets.GetU16(&baseOffset) < 5)
return;
// Skip padding.
baseOffset += 2;
dwo_cu->SetStrOffsetsBase(baseOffset);
}
// m_die_array_mutex must be already held as read/write.
void DWARFUnit::AddUnitDIE(const DWARFDebugInfoEntry &cu_die) {
dw_addr_t addr_base = cu_die.GetAttributeValueAsUnsigned(
m_dwarf, this, DW_AT_addr_base, LLDB_INVALID_ADDRESS);
if (addr_base != LLDB_INVALID_ADDRESS)
SetAddrBase(addr_base);
dw_addr_t ranges_base = cu_die.GetAttributeValueAsUnsigned(
m_dwarf, this, DW_AT_rnglists_base, LLDB_INVALID_ADDRESS);
if (ranges_base != LLDB_INVALID_ADDRESS)
SetRangesBase(ranges_base);
SetStrOffsetsBase(cu_die.GetAttributeValueAsUnsigned(
m_dwarf, this, DW_AT_str_offsets_base, 0));
uint64_t base_addr = cu_die.GetAttributeValueAsAddress(
m_dwarf, this, DW_AT_low_pc, LLDB_INVALID_ADDRESS);
if (base_addr == LLDB_INVALID_ADDRESS)
base_addr = cu_die.GetAttributeValueAsAddress(
m_dwarf, this, DW_AT_entry_pc, 0);
SetBaseAddress(base_addr);
std::unique_ptr<SymbolFileDWARFDwo> dwo_symbol_file =
m_dwarf->GetDwoSymbolFileForCompileUnit(*this, cu_die);
if (!dwo_symbol_file)
return;
DWARFUnit *dwo_cu = dwo_symbol_file->GetCompileUnit();
if (!dwo_cu)
return; // Can't fetch the compile unit from the dwo file.
DWARFBaseDIE dwo_cu_die = dwo_cu->GetUnitDIEOnly();
if (!dwo_cu_die.IsValid())
return; // Can't fetch the compile unit DIE from the dwo file.
uint64_t main_dwo_id =
cu_die.GetAttributeValueAsUnsigned(m_dwarf, this, DW_AT_GNU_dwo_id, 0);
uint64_t sub_dwo_id =
dwo_cu_die.GetAttributeValueAsUnsigned(DW_AT_GNU_dwo_id, 0);
if (main_dwo_id != sub_dwo_id)
return; // The 2 dwo ID isn't match. Don't use the dwo file as it belongs to
// a differectn compilation.
m_dwo_symbol_file = std::move(dwo_symbol_file);
// Here for DWO CU we want to use the address base set in the skeleton unit
// (DW_AT_addr_base) if it is available and use the DW_AT_GNU_addr_base
// otherwise. We do that because pre-DWARF v5 could use the DW_AT_GNU_*
// attributes which were applicable to the DWO units. The corresponding
// DW_AT_* attributes standardized in DWARF v5 are also applicable to the main
// unit in contrast.
if (addr_base == LLDB_INVALID_ADDRESS)
addr_base = cu_die.GetAttributeValueAsUnsigned(m_dwarf, this,
DW_AT_GNU_addr_base, 0);
dwo_cu->SetAddrBase(addr_base);
if (ranges_base == LLDB_INVALID_ADDRESS)
ranges_base = cu_die.GetAttributeValueAsUnsigned(m_dwarf, this,
DW_AT_GNU_ranges_base, 0);
dwo_cu->SetRangesBase(ranges_base);
dwo_cu->SetBaseObjOffset(m_offset);
SetDwoStrOffsetsBase(dwo_cu);
}
DWARFDIE DWARFUnit::LookupAddress(const dw_addr_t address) {
if (DIE()) {
const DWARFDebugAranges &func_aranges = GetFunctionAranges();
// Re-check the aranges auto pointer contents in case it was created above
if (!func_aranges.IsEmpty())
return GetDIE(func_aranges.FindAddress(address));
}
return DWARFDIE();
}
size_t DWARFUnit::AppendDIEsWithTag(const dw_tag_t tag,
std::vector<DWARFDIE> &dies,
uint32_t depth) const {
size_t old_size = dies.size();
{
llvm::sys::ScopedReader lock(m_die_array_mutex);
DWARFDebugInfoEntry::const_iterator pos;
DWARFDebugInfoEntry::const_iterator end = m_die_array.end();
for (pos = m_die_array.begin(); pos != end; ++pos) {
if (pos->Tag() == tag)
dies.emplace_back(this, &(*pos));
}
}
// Return the number of DIEs added to the collection
return dies.size() - old_size;
}
dw_offset_t DWARFUnit::GetNextUnitOffset() const {
return m_offset + GetLengthByteSize() + GetLength();
}
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;
}
void DWARFUnit::SetAddrBase(dw_addr_t addr_base) { m_addr_base = addr_base; }
void DWARFUnit::SetRangesBase(dw_addr_t ranges_base) {
m_ranges_base = ranges_base;
}
void DWARFUnit::SetBaseObjOffset(dw_offset_t base_obj_offset) {
m_base_obj_offset = base_obj_offset;
}
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_symbol_file)
m_dwo_symbol_file->GetCompileUnit()->ClearDIEsRWLocked();
}
void DWARFUnit::BuildAddressRangeTable(SymbolFileDWARF *dwarf,
DWARFDebugAranges *debug_aranges) {
// This function is usually called if there in no .debug_aranges section in
// order to produce a compile unit level set of address ranges that is
// accurate.
size_t num_debug_aranges = debug_aranges->GetNumRanges();
// First get the compile unit DIE only and check if it has a DW_AT_ranges
const DWARFDebugInfoEntry *die = GetUnitDIEPtrOnly();
const dw_offset_t cu_offset = GetOffset();
if (die) {
DWARFRangeList ranges;
const size_t num_ranges =
die->GetAttributeAddressRanges(dwarf, this, ranges, false);
if (num_ranges > 0) {
// This compile unit has DW_AT_ranges, assume this is correct if it is
// present since clang no longer makes .debug_aranges by default and it
// emits DW_AT_ranges for DW_TAG_compile_units. GCC also does this with
// recent GCC builds.
for (size_t i = 0; i < num_ranges; ++i) {
const DWARFRangeList::Entry &range = ranges.GetEntryRef(i);
debug_aranges->AppendRange(cu_offset, range.GetRangeBase(),
range.GetRangeEnd());
}
return; // We got all of our ranges from the DW_AT_ranges attribute
}
}
// We don't have a DW_AT_ranges attribute, so we need to parse the DWARF
// If the DIEs weren't parsed, then we don't want all dies for all compile
// units to stay loaded when they weren't needed. So we can end up parsing
// the DWARF and then throwing them all away to keep memory usage down.
ScopedExtractDIEs clear_dies(ExtractDIEsScoped());
die = DIEPtr();
if (die)
die->BuildAddressRangeTable(dwarf, this, debug_aranges);
if (debug_aranges->GetNumRanges() == num_debug_aranges) {
// We got nothing from the functions, maybe we have a line tables only
// situation. Check the line tables and build the arange table from this.
SymbolContext sc;
sc.comp_unit = dwarf->GetCompUnitForDWARFCompUnit(this);
if (sc.comp_unit) {
SymbolFileDWARFDebugMap *debug_map_sym_file =
m_dwarf->GetDebugMapSymfile();
if (debug_map_sym_file == NULL) {
LineTable *line_table = sc.comp_unit->GetLineTable();
if (line_table) {
LineTable::FileAddressRanges file_ranges;
const bool append = true;
const size_t num_ranges =
line_table->GetContiguousFileAddressRanges(file_ranges, append);
for (uint32_t idx = 0; idx < num_ranges; ++idx) {
const LineTable::FileAddressRanges::Entry &range =
file_ranges.GetEntryRef(idx);
debug_aranges->AppendRange(cu_offset, range.GetRangeBase(),
range.GetRangeEnd());
}
}
} else
debug_map_sym_file->AddOSOARanges(dwarf, debug_aranges);
}
}
if (debug_aranges->GetNumRanges() == num_debug_aranges) {
// We got nothing from the functions, maybe we have a line tables only
// situation. Check the line tables and build the arange table from this.
SymbolContext sc;
sc.comp_unit = dwarf->GetCompUnitForDWARFCompUnit(this);
if (sc.comp_unit) {
LineTable *line_table = sc.comp_unit->GetLineTable();
if (line_table) {
LineTable::FileAddressRanges file_ranges;
const bool append = true;
const size_t num_ranges =
line_table->GetContiguousFileAddressRanges(file_ranges, append);
for (uint32_t idx = 0; idx < num_ranges; ++idx) {
const LineTable::FileAddressRanges::Entry &range =
file_ranges.GetEntryRef(idx);
debug_aranges->AppendRange(GetOffset(), range.GetRangeBase(),
range.GetRangeEnd());
}
}
}
}
}
lldb::ByteOrder DWARFUnit::GetByteOrder() const {
return m_dwarf->GetObjectFile()->GetByteOrder();
}
TypeSystem *DWARFUnit::GetTypeSystem() {
if (m_dwarf)
return m_dwarf->GetTypeSystemForLanguage(GetLanguageType());
else
return nullptr;
}
DWARFFormValue::FixedFormSizes DWARFUnit::GetFixedFormSizes() {
return DWARFFormValue::GetFixedFormSizesForAddressSize(GetAddressByteSize());
}
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) {
if (GetDwoSymbolFile())
return GetDwoSymbolFile()->GetCompileUnit()->GetDIE(die_offset);
if (ContainsDIEOffset(die_offset)) {
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) {
if (die_offset == (*pos).GetOffset())
return DWARFDIE(this, &(*pos));
}
} else
GetSymbolFileDWARF()->GetObjectFile()->GetModule()->ReportError(
"GetDIE for DIE 0x%" PRIx32 " is outside of its CU 0x%" PRIx32,
die_offset, GetOffset());
}
return DWARFDIE(); // Not found
}
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;
if (m_dwo_symbol_file)
m_dwo_symbol_file->GetCompileUnit()->SetUserData(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
}
SymbolFileDWARF *DWARFUnit::GetSymbolFileDWARF() const { return m_dwarf; }
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(m_dwarf, this, DW_AT_producer, NULL);
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]+)"));
RegularExpression::Match regex_match(3);
if (g_clang_version_regex.Execute(llvm::StringRef(producer_cstr),
&regex_match)) {
std::string str;
if (regex_match.GetMatchAtIndex(producer_cstr, 1, str))
m_producer_version_major =
StringConvert::ToUInt32(str.c_str(), UINT32_MAX, 10);
if (regex_match.GetMatchAtIndex(producer_cstr, 2, str))
m_producer_version_minor =
StringConvert::ToUInt32(str.c_str(), UINT32_MAX, 10);
if (regex_match.GetMatchAtIndex(producer_cstr, 3, str))
m_producer_version_update =
StringConvert::ToUInt32(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;
}
LanguageType DWARFUnit::LanguageTypeFromDWARF(uint64_t val) {
// Note: user languages between lo_user and hi_user must be handled
// explicitly here.
switch (val) {
case DW_LANG_Mips_Assembler:
return eLanguageTypeMipsAssembler;
case DW_LANG_GOOGLE_RenderScript:
return eLanguageTypeExtRenderScript;
default:
return static_cast<LanguageType>(val);
}
}
LanguageType DWARFUnit::GetLanguageType() {
if (m_language_type != eLanguageTypeUnknown)
return m_language_type;
const DWARFDebugInfoEntry *die = GetUnitDIEPtrOnly();
if (die)
m_language_type = LanguageTypeFromDWARF(
die->GetAttributeValueAsUnsigned(m_dwarf, 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(m_dwarf, 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;
}
// 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) {
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;
}
static FileSpec resolveCompDir(const FileSpec &path) {
bool is_symlink = SymbolFileDWARF::GetSymlinkPaths().FindFileIndex(
0, path, /*full*/ true) != UINT32_MAX;
if (!is_symlink)
return path;
namespace fs = llvm::sys::fs;
if (fs::get_file_type(path.GetPath(), false) != fs::file_type::symlink_file)
return path;
FileSpec resolved_symlink;
const auto error = FileSystem::Instance().Readlink(path, resolved_symlink);
if (error.Success())
return resolved_symlink;
return path;
}
void DWARFUnit::ComputeCompDirAndGuessPathStyle() {
m_comp_dir = FileSpec();
const DWARFDebugInfoEntry *die = GetUnitDIEPtrOnly();
if (!die)
return;
llvm::StringRef comp_dir = removeHostnameFromPathname(
die->GetAttributeValueAsString(m_dwarf, this, DW_AT_comp_dir, NULL));
if (!comp_dir.empty()) {
FileSpec::Style comp_dir_style =
FileSpec::GuessPathStyle(comp_dir).getValueOr(FileSpec::Style::native);
m_comp_dir = resolveCompDir(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(m_dwarf, this, DW_AT_name, NULL);
m_comp_dir = FileSpec(
"", FileSpec::GuessPathStyle(name).getValueOr(FileSpec::Style::native));
}
}
SymbolFileDWARFDwo *DWARFUnit::GetDwoSymbolFile() const {
return m_dwo_symbol_file.get();
}
dw_offset_t DWARFUnit::GetBaseObjOffset() const { return m_base_obj_offset; }
const DWARFDebugAranges &DWARFUnit::GetFunctionAranges() {
if (m_func_aranges_up == NULL) {
m_func_aranges_up.reset(new DWARFDebugAranges());
const DWARFDebugInfoEntry *die = DIEPtr();
if (die)
die->BuildFunctionAddressRangeTable(m_dwarf, this,
m_func_aranges_up.get());
if (m_dwo_symbol_file) {
DWARFUnit *dwo_cu = m_dwo_symbol_file->GetCompileUnit();
const DWARFDebugInfoEntry *dwo_die = dwo_cu->DIEPtr();
if (dwo_die)
dwo_die->BuildFunctionAddressRangeTable(m_dwo_symbol_file.get(), dwo_cu,
m_func_aranges_up.get());
}
const bool minimize = false;
m_func_aranges_up->Sort(minimize);
}
return *m_func_aranges_up;
}