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clang-p2996/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugInfoEntry.cpp
Alex Langford f09cca4c6f [lldb] Remove lldb's DWARFAbbreviationDeclarationSet in favor of llvm's 
lldb's and llvm's implementations of DWARFAbbreviationDeclarationSet are
now close enough (almost the same, actually) to replace lldb's with
llvm's wholesale. llvm's is also tested against the same kinds of
scenarios that lldb's is tested against so we can remove lldb's tests
here. (see: llvm/unittests/DebugInfo/DWARF/DWARFDebugAbbrevTest.cpp).

Differential Revision: https://reviews.llvm.org/D152476
2023-06-12 14:53:44 -07:00

858 lines
27 KiB
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//===-- DWARFDebugInfoEntry.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 "DWARFDebugInfoEntry.h"
#include <cassert>
#include <algorithm>
#include <optional>
#include "llvm/Support/LEB128.h"
#include "lldb/Core/Module.h"
#include "lldb/Expression/DWARFExpression.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Utility/Stream.h"
#include "lldb/Utility/StreamString.h"
#include "DWARFCompileUnit.h"
#include "DWARFDebugAbbrev.h"
#include "DWARFDebugAranges.h"
#include "DWARFDebugInfo.h"
#include "DWARFDebugRanges.h"
#include "DWARFDeclContext.h"
#include "DWARFFormValue.h"
#include "DWARFUnit.h"
#include "SymbolFileDWARF.h"
#include "SymbolFileDWARFDwo.h"
using namespace lldb_private;
using namespace lldb_private::dwarf;
extern int g_verbose;
// Extract a debug info entry for a given DWARFUnit from the data
// starting at the offset in offset_ptr
bool DWARFDebugInfoEntry::Extract(const DWARFDataExtractor &data,
const DWARFUnit *cu,
lldb::offset_t *offset_ptr) {
m_offset = *offset_ptr;
m_parent_idx = 0;
m_sibling_idx = 0;
const uint64_t abbr_idx = data.GetULEB128(offset_ptr);
lldbassert(abbr_idx <= UINT16_MAX);
m_abbr_idx = abbr_idx;
// assert (fixed_form_sizes); // For best performance this should be
// specified!
if (m_abbr_idx == 0) {
m_tag = llvm::dwarf::DW_TAG_null;
m_has_children = false;
return true; // NULL debug tag entry
}
lldb::offset_t offset = *offset_ptr;
const auto *abbrevDecl = GetAbbreviationDeclarationPtr(cu);
if (abbrevDecl == nullptr) {
cu->GetSymbolFileDWARF().GetObjectFile()->GetModule()->ReportError(
"[{0:x16}]: invalid abbreviation code {1}, "
"please file a bug and "
"attach the file at the start of this error message",
(uint64_t)m_offset, (unsigned)abbr_idx);
// WE can't parse anymore if the DWARF is borked...
*offset_ptr = UINT32_MAX;
return false;
}
m_tag = abbrevDecl->getTag();
m_has_children = abbrevDecl->hasChildren();
// Skip all data in the .debug_info or .debug_types for the attributes
dw_form_t form;
for (const auto &attribute : abbrevDecl->attributes()) {
form = attribute.Form;
std::optional<uint8_t> fixed_skip_size =
DWARFFormValue::GetFixedSize(form, cu);
if (fixed_skip_size)
offset += *fixed_skip_size;
else {
bool form_is_indirect = false;
do {
form_is_indirect = false;
uint32_t form_size = 0;
switch (form) {
// Blocks if inlined data that have a length field and the data bytes
// inlined in the .debug_info/.debug_types
case DW_FORM_exprloc:
case DW_FORM_block:
form_size = data.GetULEB128(&offset);
break;
case DW_FORM_block1:
form_size = data.GetU8_unchecked(&offset);
break;
case DW_FORM_block2:
form_size = data.GetU16_unchecked(&offset);
break;
case DW_FORM_block4:
form_size = data.GetU32_unchecked(&offset);
break;
// Inlined NULL terminated C-strings
case DW_FORM_string:
data.GetCStr(&offset);
break;
// Compile unit address sized values
case DW_FORM_addr:
form_size = cu->GetAddressByteSize();
break;
case DW_FORM_ref_addr:
if (cu->GetVersion() <= 2)
form_size = cu->GetAddressByteSize();
else
form_size = 4;
break;
// 0 sized form
case DW_FORM_flag_present:
form_size = 0;
break;
// 1 byte values
case DW_FORM_addrx1:
case DW_FORM_data1:
case DW_FORM_flag:
case DW_FORM_ref1:
case DW_FORM_strx1:
form_size = 1;
break;
// 2 byte values
case DW_FORM_addrx2:
case DW_FORM_data2:
case DW_FORM_ref2:
case DW_FORM_strx2:
form_size = 2;
break;
// 3 byte values
case DW_FORM_addrx3:
case DW_FORM_strx3:
form_size = 3;
break;
// 4 byte values
case DW_FORM_addrx4:
case DW_FORM_data4:
case DW_FORM_ref4:
case DW_FORM_strx4:
form_size = 4;
break;
// 8 byte values
case DW_FORM_data8:
case DW_FORM_ref8:
case DW_FORM_ref_sig8:
form_size = 8;
break;
// signed or unsigned LEB 128 values
case DW_FORM_addrx:
case DW_FORM_loclistx:
case DW_FORM_rnglistx:
case DW_FORM_sdata:
case DW_FORM_udata:
case DW_FORM_ref_udata:
case DW_FORM_GNU_addr_index:
case DW_FORM_GNU_str_index:
case DW_FORM_strx:
data.Skip_LEB128(&offset);
break;
case DW_FORM_indirect:
form_is_indirect = true;
form = static_cast<dw_form_t>(data.GetULEB128(&offset));
break;
case DW_FORM_strp:
case DW_FORM_line_strp:
case DW_FORM_sec_offset:
data.GetU32(&offset);
break;
case DW_FORM_implicit_const:
form_size = 0;
break;
default:
cu->GetSymbolFileDWARF().GetObjectFile()->GetModule()->ReportError(
"[{0:x16}]: Unsupported DW_FORM_{1:x}, please file a bug "
"and "
"attach the file at the start of this error message",
(uint64_t)m_offset, (unsigned)form);
*offset_ptr = m_offset;
return false;
}
offset += form_size;
} while (form_is_indirect);
}
}
*offset_ptr = offset;
return true;
}
static DWARFRangeList GetRangesOrReportError(DWARFUnit &unit,
const DWARFDebugInfoEntry &die,
const DWARFFormValue &value) {
llvm::Expected<DWARFRangeList> expected_ranges =
(value.Form() == DW_FORM_rnglistx)
? unit.FindRnglistFromIndex(value.Unsigned())
: unit.FindRnglistFromOffset(value.Unsigned());
if (expected_ranges)
return std::move(*expected_ranges);
unit.GetSymbolFileDWARF().GetObjectFile()->GetModule()->ReportError(
"[{0:x16}]: DIE has DW_AT_ranges({1} {2:x16}) attribute, but "
"range extraction failed ({3}), please file a bug "
"and attach the file at the start of this error message",
die.GetOffset(),
llvm::dwarf::FormEncodingString(value.Form()).str().c_str(),
value.Unsigned(), toString(expected_ranges.takeError()).c_str());
return DWARFRangeList();
}
static void ExtractAttrAndFormValue(
const llvm::DWARFAbbreviationDeclaration::AttributeSpec &attr_spec,
dw_attr_t &attr, DWARFFormValue &form_value) {
attr = attr_spec.Attr;
form_value.FormRef() = attr_spec.Form;
if (attr_spec.isImplicitConst())
form_value.SetSigned(attr_spec.getImplicitConstValue());
}
// GetDIENamesAndRanges
//
// Gets the valid address ranges for a given DIE by looking for a
// DW_AT_low_pc/DW_AT_high_pc pair, DW_AT_entry_pc, or DW_AT_ranges attributes.
bool DWARFDebugInfoEntry::GetDIENamesAndRanges(
DWARFUnit *cu, const char *&name, const char *&mangled,
DWARFRangeList &ranges, std::optional<int> &decl_file,
std::optional<int> &decl_line, std::optional<int> &decl_column,
std::optional<int> &call_file, std::optional<int> &call_line,
std::optional<int> &call_column, DWARFExpressionList *frame_base) const {
dw_addr_t lo_pc = LLDB_INVALID_ADDRESS;
dw_addr_t hi_pc = LLDB_INVALID_ADDRESS;
std::vector<DWARFDIE> dies;
bool set_frame_base_loclist_addr = false;
SymbolFileDWARF &dwarf = cu->GetSymbolFileDWARF();
lldb::ModuleSP module = dwarf.GetObjectFile()->GetModule();
if (const auto *abbrevDecl = GetAbbreviationDeclarationPtr(cu)) {
const DWARFDataExtractor &data = cu->GetData();
lldb::offset_t offset = GetFirstAttributeOffset();
if (!data.ValidOffset(offset))
return false;
bool do_offset = false;
for (const auto &attribute : abbrevDecl->attributes()) {
DWARFFormValue form_value(cu);
dw_attr_t attr;
ExtractAttrAndFormValue(attribute, attr, form_value);
if (form_value.ExtractValue(data, &offset)) {
switch (attr) {
case DW_AT_low_pc:
lo_pc = form_value.Address();
if (do_offset)
hi_pc += lo_pc;
do_offset = false;
break;
case DW_AT_entry_pc:
lo_pc = form_value.Address();
break;
case DW_AT_high_pc:
if (form_value.Form() == DW_FORM_addr ||
form_value.Form() == DW_FORM_addrx ||
form_value.Form() == DW_FORM_GNU_addr_index) {
hi_pc = form_value.Address();
} else {
hi_pc = form_value.Unsigned();
if (lo_pc == LLDB_INVALID_ADDRESS)
do_offset = hi_pc != LLDB_INVALID_ADDRESS;
else
hi_pc += lo_pc; // DWARF 4 introduces <offset-from-lo-pc> to save
// on relocations
}
break;
case DW_AT_ranges:
ranges = GetRangesOrReportError(*cu, *this, form_value);
break;
case DW_AT_name:
if (name == nullptr)
name = form_value.AsCString();
break;
case DW_AT_MIPS_linkage_name:
case DW_AT_linkage_name:
if (mangled == nullptr)
mangled = form_value.AsCString();
break;
case DW_AT_abstract_origin:
dies.push_back(form_value.Reference());
break;
case DW_AT_specification:
dies.push_back(form_value.Reference());
break;
case DW_AT_decl_file:
if (!decl_file)
decl_file = form_value.Unsigned();
break;
case DW_AT_decl_line:
if (!decl_line)
decl_line = form_value.Unsigned();
break;
case DW_AT_decl_column:
if (!decl_column)
decl_column = form_value.Unsigned();
break;
case DW_AT_call_file:
if (!call_file)
call_file = form_value.Unsigned();
break;
case DW_AT_call_line:
if (!call_line)
call_line = form_value.Unsigned();
break;
case DW_AT_call_column:
if (!call_column)
call_column = form_value.Unsigned();
break;
case DW_AT_frame_base:
if (frame_base) {
if (form_value.BlockData()) {
uint32_t block_offset =
form_value.BlockData() - data.GetDataStart();
uint32_t block_length = form_value.Unsigned();
*frame_base =
DWARFExpressionList(module,
DWARFExpression(DataExtractor(
data, block_offset, block_length)),
cu);
} else {
DataExtractor data = cu->GetLocationData();
const dw_offset_t offset = form_value.Unsigned();
if (data.ValidOffset(offset)) {
data = DataExtractor(data, offset, data.GetByteSize() - offset);
if (lo_pc != LLDB_INVALID_ADDRESS) {
assert(lo_pc >= cu->GetBaseAddress());
DWARFExpression::ParseDWARFLocationList(cu, data, frame_base);
frame_base->SetFuncFileAddress(lo_pc);
} else
set_frame_base_loclist_addr = true;
}
}
}
break;
default:
break;
}
}
}
}
if (ranges.IsEmpty()) {
if (lo_pc != LLDB_INVALID_ADDRESS) {
if (hi_pc != LLDB_INVALID_ADDRESS && hi_pc > lo_pc)
ranges.Append(DWARFRangeList::Entry(lo_pc, hi_pc - lo_pc));
else
ranges.Append(DWARFRangeList::Entry(lo_pc, 0));
}
}
if (set_frame_base_loclist_addr) {
dw_addr_t lowest_range_pc = ranges.GetMinRangeBase(0);
assert(lowest_range_pc >= cu->GetBaseAddress());
frame_base->SetFuncFileAddress(lowest_range_pc);
}
if (ranges.IsEmpty() || name == nullptr || mangled == nullptr) {
for (const DWARFDIE &die : dies) {
if (die) {
die.GetDIE()->GetDIENamesAndRanges(die.GetCU(), name, mangled, ranges,
decl_file, decl_line, decl_column,
call_file, call_line, call_column);
}
}
}
return !ranges.IsEmpty();
}
// Get all attribute values for a given DIE, including following any
// specification or abstract origin attributes and including those in the
// results. Any duplicate attributes will have the first instance take
// precedence (this can happen for declaration attributes).
void DWARFDebugInfoEntry::GetAttributes(DWARFUnit *cu,
DWARFAttributes &attributes,
Recurse recurse,
uint32_t curr_depth) const {
const auto *abbrevDecl = GetAbbreviationDeclarationPtr(cu);
if (!abbrevDecl) {
attributes.Clear();
return;
}
const DWARFDataExtractor &data = cu->GetData();
lldb::offset_t offset = GetFirstAttributeOffset();
for (const auto &attribute : abbrevDecl->attributes()) {
DWARFFormValue form_value(cu);
dw_attr_t attr;
ExtractAttrAndFormValue(attribute, attr, form_value);
// If we are tracking down DW_AT_specification or DW_AT_abstract_origin
// attributes, the depth will be non-zero. We need to omit certain
// attributes that don't make sense.
switch (attr) {
case DW_AT_sibling:
case DW_AT_declaration:
if (curr_depth > 0) {
// This attribute doesn't make sense when combined with the DIE that
// references this DIE. We know a DIE is referencing this DIE because
// curr_depth is not zero
break;
}
[[fallthrough]];
default:
attributes.Append(form_value, offset, attr);
break;
}
if (recurse == Recurse::yes &&
((attr == DW_AT_specification) || (attr == DW_AT_abstract_origin))) {
if (form_value.ExtractValue(data, &offset)) {
DWARFDIE spec_die = form_value.Reference();
if (spec_die)
spec_die.GetDIE()->GetAttributes(spec_die.GetCU(), attributes,
recurse, curr_depth + 1);
}
} else {
const dw_form_t form = form_value.Form();
std::optional<uint8_t> fixed_skip_size =
DWARFFormValue::GetFixedSize(form, cu);
if (fixed_skip_size)
offset += *fixed_skip_size;
else
DWARFFormValue::SkipValue(form, data, &offset, cu);
}
}
}
// GetAttributeValue
//
// Get the value of an attribute and return the .debug_info or .debug_types
// offset of the attribute if it was properly extracted into form_value,
// or zero if we fail since an offset of zero is invalid for an attribute (it
// would be a compile unit header).
dw_offset_t DWARFDebugInfoEntry::GetAttributeValue(
const DWARFUnit *cu, const dw_attr_t attr, DWARFFormValue &form_value,
dw_offset_t *end_attr_offset_ptr,
bool check_specification_or_abstract_origin) const {
if (const auto *abbrevDecl = GetAbbreviationDeclarationPtr(cu)) {
std::optional<uint32_t> attr_idx = abbrevDecl->findAttributeIndex(attr);
if (attr_idx) {
const DWARFDataExtractor &data = cu->GetData();
lldb::offset_t offset = GetFirstAttributeOffset();
uint32_t idx = 0;
while (idx < *attr_idx)
DWARFFormValue::SkipValue(abbrevDecl->getFormByIndex(idx++), data,
&offset, cu);
const dw_offset_t attr_offset = offset;
form_value.SetUnit(cu);
form_value.SetForm(abbrevDecl->getFormByIndex(idx));
if (form_value.ExtractValue(data, &offset)) {
if (end_attr_offset_ptr)
*end_attr_offset_ptr = offset;
return attr_offset;
}
}
}
if (check_specification_or_abstract_origin) {
if (GetAttributeValue(cu, DW_AT_specification, form_value)) {
DWARFDIE die = form_value.Reference();
if (die) {
dw_offset_t die_offset = die.GetDIE()->GetAttributeValue(
die.GetCU(), attr, form_value, end_attr_offset_ptr, false);
if (die_offset)
return die_offset;
}
}
if (GetAttributeValue(cu, DW_AT_abstract_origin, form_value)) {
DWARFDIE die = form_value.Reference();
if (die) {
dw_offset_t die_offset = die.GetDIE()->GetAttributeValue(
die.GetCU(), attr, form_value, end_attr_offset_ptr, false);
if (die_offset)
return die_offset;
}
}
}
return 0;
}
// GetAttributeValueAsString
//
// Get the value of an attribute as a string return it. The resulting pointer
// to the string data exists within the supplied SymbolFileDWARF and will only
// be available as long as the SymbolFileDWARF is still around and it's content
// doesn't change.
const char *DWARFDebugInfoEntry::GetAttributeValueAsString(
const DWARFUnit *cu, const dw_attr_t attr, const char *fail_value,
bool check_specification_or_abstract_origin) const {
DWARFFormValue form_value;
if (GetAttributeValue(cu, attr, form_value, nullptr,
check_specification_or_abstract_origin))
return form_value.AsCString();
return fail_value;
}
// GetAttributeValueAsUnsigned
//
// Get the value of an attribute as unsigned and return it.
uint64_t DWARFDebugInfoEntry::GetAttributeValueAsUnsigned(
const DWARFUnit *cu, const dw_attr_t attr, uint64_t fail_value,
bool check_specification_or_abstract_origin) const {
DWARFFormValue form_value;
if (GetAttributeValue(cu, attr, form_value, nullptr,
check_specification_or_abstract_origin))
return form_value.Unsigned();
return fail_value;
}
std::optional<uint64_t>
DWARFDebugInfoEntry::GetAttributeValueAsOptionalUnsigned(
const DWARFUnit *cu, const dw_attr_t attr,
bool check_specification_or_abstract_origin) const {
DWARFFormValue form_value;
if (GetAttributeValue(cu, attr, form_value, nullptr,
check_specification_or_abstract_origin))
return form_value.Unsigned();
return std::nullopt;
}
// GetAttributeValueAsReference
//
// Get the value of an attribute as reference and fix up and compile unit
// relative offsets as needed.
DWARFDIE DWARFDebugInfoEntry::GetAttributeValueAsReference(
const DWARFUnit *cu, const dw_attr_t attr,
bool check_specification_or_abstract_origin) const {
DWARFFormValue form_value;
if (GetAttributeValue(cu, attr, form_value, nullptr,
check_specification_or_abstract_origin))
return form_value.Reference();
return {};
}
uint64_t DWARFDebugInfoEntry::GetAttributeValueAsAddress(
const DWARFUnit *cu, const dw_attr_t attr, uint64_t fail_value,
bool check_specification_or_abstract_origin) const {
DWARFFormValue form_value;
if (GetAttributeValue(cu, attr, form_value, nullptr,
check_specification_or_abstract_origin))
return form_value.Address();
return fail_value;
}
// GetAttributeHighPC
//
// Get the hi_pc, adding hi_pc to lo_pc when specified as an <offset-from-low-
// pc>.
//
// Returns the hi_pc or fail_value.
dw_addr_t DWARFDebugInfoEntry::GetAttributeHighPC(
const DWARFUnit *cu, dw_addr_t lo_pc, uint64_t fail_value,
bool check_specification_or_abstract_origin) const {
DWARFFormValue form_value;
if (GetAttributeValue(cu, DW_AT_high_pc, form_value, nullptr,
check_specification_or_abstract_origin)) {
dw_form_t form = form_value.Form();
if (form == DW_FORM_addr || form == DW_FORM_addrx ||
form == DW_FORM_GNU_addr_index)
return form_value.Address();
// DWARF4 can specify the hi_pc as an <offset-from-lowpc>
return lo_pc + form_value.Unsigned();
}
return fail_value;
}
// GetAttributeAddressRange
//
// Get the lo_pc and hi_pc, adding hi_pc to lo_pc when specified as an <offset-
// from-low-pc>.
//
// Returns true or sets lo_pc and hi_pc to fail_value.
bool DWARFDebugInfoEntry::GetAttributeAddressRange(
const DWARFUnit *cu, dw_addr_t &lo_pc, dw_addr_t &hi_pc,
uint64_t fail_value, bool check_specification_or_abstract_origin) const {
lo_pc = GetAttributeValueAsAddress(cu, DW_AT_low_pc, fail_value,
check_specification_or_abstract_origin);
if (lo_pc != fail_value) {
hi_pc = GetAttributeHighPC(cu, lo_pc, fail_value,
check_specification_or_abstract_origin);
if (hi_pc != fail_value)
return true;
}
lo_pc = fail_value;
hi_pc = fail_value;
return false;
}
DWARFRangeList DWARFDebugInfoEntry::GetAttributeAddressRanges(
DWARFUnit *cu, bool check_hi_lo_pc,
bool check_specification_or_abstract_origin) const {
DWARFFormValue form_value;
if (GetAttributeValue(cu, DW_AT_ranges, form_value))
return GetRangesOrReportError(*cu, *this, form_value);
DWARFRangeList ranges;
if (check_hi_lo_pc) {
dw_addr_t lo_pc = LLDB_INVALID_ADDRESS;
dw_addr_t hi_pc = LLDB_INVALID_ADDRESS;
if (GetAttributeAddressRange(cu, lo_pc, hi_pc, LLDB_INVALID_ADDRESS,
check_specification_or_abstract_origin)) {
if (lo_pc < hi_pc)
ranges.Append(DWARFRangeList::Entry(lo_pc, hi_pc - lo_pc));
}
}
return ranges;
}
// GetName
//
// Get value of the DW_AT_name attribute and return it if one exists, else
// return NULL.
const char *DWARFDebugInfoEntry::GetName(const DWARFUnit *cu) const {
return GetAttributeValueAsString(cu, DW_AT_name, nullptr, true);
}
// GetMangledName
//
// Get value of the DW_AT_MIPS_linkage_name attribute and return it if one
// exists, else return the value of the DW_AT_name attribute
const char *
DWARFDebugInfoEntry::GetMangledName(const DWARFUnit *cu,
bool substitute_name_allowed) const {
const char *name = nullptr;
name = GetAttributeValueAsString(cu, DW_AT_MIPS_linkage_name, nullptr, true);
if (name)
return name;
name = GetAttributeValueAsString(cu, DW_AT_linkage_name, nullptr, true);
if (name)
return name;
if (!substitute_name_allowed)
return nullptr;
name = GetAttributeValueAsString(cu, DW_AT_name, nullptr, true);
return name;
}
// GetPubname
//
// Get value the name for a DIE as it should appear for a .debug_pubnames or
// .debug_pubtypes section.
const char *DWARFDebugInfoEntry::GetPubname(const DWARFUnit *cu) const {
const char *name = nullptr;
if (!cu)
return name;
name = GetAttributeValueAsString(cu, DW_AT_MIPS_linkage_name, nullptr, true);
if (name)
return name;
name = GetAttributeValueAsString(cu, DW_AT_linkage_name, nullptr, true);
if (name)
return name;
name = GetAttributeValueAsString(cu, DW_AT_name, nullptr, true);
return name;
}
/// This function is builds a table very similar to the standard .debug_aranges
/// table, except that the actual DIE offset for the function is placed in the
/// table instead of the compile unit offset.
void DWARFDebugInfoEntry::BuildFunctionAddressRangeTable(
DWARFUnit *cu, DWARFDebugAranges *debug_aranges) const {
if (m_tag) {
if (m_tag == DW_TAG_subprogram) {
DWARFRangeList ranges =
GetAttributeAddressRanges(cu, /*check_hi_lo_pc=*/true);
for (const auto &r : ranges) {
debug_aranges->AppendRange(GetOffset(), r.GetRangeBase(),
r.GetRangeEnd());
}
}
const DWARFDebugInfoEntry *child = GetFirstChild();
while (child) {
child->BuildFunctionAddressRangeTable(cu, debug_aranges);
child = child->GetSibling();
}
}
}
DWARFDeclContext
DWARFDebugInfoEntry::GetDWARFDeclContextStatic(const DWARFDebugInfoEntry *die,
DWARFUnit *cu) {
DWARFDeclContext dwarf_decl_ctx;
for (;;) {
const dw_tag_t tag = die->Tag();
if (tag == DW_TAG_compile_unit || tag == DW_TAG_partial_unit)
return dwarf_decl_ctx;
dwarf_decl_ctx.AppendDeclContext(tag, die->GetName(cu));
DWARFDIE parent_decl_ctx_die = die->GetParentDeclContextDIE(cu);
if (!parent_decl_ctx_die || parent_decl_ctx_die.GetDIE() == die)
return dwarf_decl_ctx;
if (parent_decl_ctx_die.Tag() == DW_TAG_compile_unit ||
parent_decl_ctx_die.Tag() == DW_TAG_partial_unit)
return dwarf_decl_ctx;
die = parent_decl_ctx_die.GetDIE();
cu = parent_decl_ctx_die.GetCU();
}
}
DWARFDeclContext DWARFDebugInfoEntry::GetDWARFDeclContext(DWARFUnit *cu) const {
return GetDWARFDeclContextStatic(this, cu);
}
DWARFDIE
DWARFDebugInfoEntry::GetParentDeclContextDIE(DWARFUnit *cu) const {
DWARFAttributes attributes = GetAttributes(cu, Recurse::yes);
return GetParentDeclContextDIE(cu, attributes);
}
DWARFDIE
DWARFDebugInfoEntry::GetParentDeclContextDIE(
DWARFUnit *cu, const DWARFAttributes &attributes) const {
DWARFDIE die(cu, const_cast<DWARFDebugInfoEntry *>(this));
while (die) {
// If this is the original DIE that we are searching for a declaration for,
// then don't look in the cache as we don't want our own decl context to be
// our decl context...
if (die.GetDIE() != this) {
switch (die.Tag()) {
case DW_TAG_compile_unit:
case DW_TAG_partial_unit:
case DW_TAG_namespace:
case DW_TAG_structure_type:
case DW_TAG_union_type:
case DW_TAG_class_type:
return die;
default:
break;
}
}
DWARFDIE spec_die = attributes.FormValueAsReference(DW_AT_specification);
if (spec_die) {
DWARFDIE decl_ctx_die = spec_die.GetParentDeclContextDIE();
if (decl_ctx_die)
return decl_ctx_die;
}
DWARFDIE abs_die = attributes.FormValueAsReference(DW_AT_abstract_origin);
if (abs_die) {
DWARFDIE decl_ctx_die = abs_die.GetParentDeclContextDIE();
if (decl_ctx_die)
return decl_ctx_die;
}
die = die.GetParent();
}
return DWARFDIE();
}
lldb::offset_t DWARFDebugInfoEntry::GetFirstAttributeOffset() const {
return GetOffset() + llvm::getULEB128Size(m_abbr_idx);
}
const DWARFAbbreviationDeclaration *
DWARFDebugInfoEntry::GetAbbreviationDeclarationPtr(const DWARFUnit *cu) const {
if (!cu)
return nullptr;
const DWARFAbbreviationDeclarationSet *abbrev_set = cu->GetAbbreviations();
if (!abbrev_set)
return nullptr;
return abbrev_set->getAbbreviationDeclaration(m_abbr_idx);
}
bool DWARFDebugInfoEntry::IsGlobalOrStaticScopeVariable() const {
if (Tag() != DW_TAG_variable)
return false;
const DWARFDebugInfoEntry *parent_die = GetParent();
while (parent_die != nullptr) {
switch (parent_die->Tag()) {
case DW_TAG_subprogram:
case DW_TAG_lexical_block:
case DW_TAG_inlined_subroutine:
return false;
case DW_TAG_compile_unit:
case DW_TAG_partial_unit:
return true;
default:
break;
}
parent_die = parent_die->GetParent();
}
return false;
}
bool DWARFDebugInfoEntry::operator==(const DWARFDebugInfoEntry &rhs) const {
return m_offset == rhs.m_offset && m_parent_idx == rhs.m_parent_idx &&
m_sibling_idx == rhs.m_sibling_idx &&
m_abbr_idx == rhs.m_abbr_idx && m_has_children == rhs.m_has_children &&
m_tag == rhs.m_tag;
}
bool DWARFDebugInfoEntry::operator!=(const DWARFDebugInfoEntry &rhs) const {
return !(*this == rhs);
}
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