| //===-- 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 "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( |
| "{0x%8.8x}: invalid abbreviation code %u, please file a bug and " |
| "attach the file at the start of this error message", |
| m_offset, (unsigned)abbr_idx); |
| // WE can't parse anymore if the DWARF is borked... |
| *offset_ptr = UINT32_MAX; |
| return false; |
| } |
| m_tag = abbrevDecl->Tag(); |
| m_has_children = abbrevDecl->HasChildren(); |
| // Skip all data in the .debug_info or .debug_types for the attributes |
| const uint32_t numAttributes = abbrevDecl->NumAttributes(); |
| uint32_t i; |
| dw_form_t form; |
| for (i = 0; i < numAttributes; ++i) { |
| form = abbrevDecl->GetFormByIndexUnchecked(i); |
| llvm::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 = 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( |
| "{0x%8.8x}: Unsupported DW_FORM_0x%x, please file a bug and " |
| "attach the file at the start of this error message", |
| 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( |
| "{0x%8.8x}: DIE has DW_AT_ranges(%s 0x%" PRIx64 ") attribute, but " |
| "range extraction failed (%s), 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(); |
| } |
| |
| // 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, int &decl_file, int &decl_line, int &decl_column, |
| int &call_file, int &call_line, 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; |
| |
| const auto *abbrevDecl = GetAbbreviationDeclarationPtr(cu); |
| |
| SymbolFileDWARF &dwarf = cu->GetSymbolFileDWARF(); |
| lldb::ModuleSP module = dwarf.GetObjectFile()->GetModule(); |
| |
| if (abbrevDecl) { |
| const DWARFDataExtractor &data = cu->GetData(); |
| lldb::offset_t offset = GetFirstAttributeOffset(); |
| |
| if (!data.ValidOffset(offset)) |
| return false; |
| |
| const uint32_t numAttributes = abbrevDecl->NumAttributes(); |
| bool do_offset = false; |
| |
| for (uint32_t i = 0; i < numAttributes; ++i) { |
| DWARFFormValue form_value(cu); |
| dw_attr_t attr; |
| abbrevDecl->GetAttrAndFormValueByIndex(i, 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 == 0) |
| decl_file = form_value.Unsigned(); |
| break; |
| |
| case DW_AT_decl_line: |
| if (decl_line == 0) |
| decl_line = form_value.Unsigned(); |
| break; |
| |
| case DW_AT_decl_column: |
| if (decl_column == 0) |
| decl_column = form_value.Unsigned(); |
| break; |
| |
| case DW_AT_call_file: |
| if (call_file == 0) |
| call_file = form_value.Unsigned(); |
| break; |
| |
| case DW_AT_call_line: |
| if (call_line == 0) |
| call_line = form_value.Unsigned(); |
| break; |
| |
| case DW_AT_call_column: |
| if (call_column == 0) |
| 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). |
| size_t DWARFDebugInfoEntry::GetAttributes(DWARFUnit *cu, |
| DWARFAttributes &attributes, |
| Recurse recurse, |
| uint32_t curr_depth) const { |
| const auto *abbrevDecl = GetAbbreviationDeclarationPtr(cu); |
| if (abbrevDecl) { |
| const DWARFDataExtractor &data = cu->GetData(); |
| lldb::offset_t offset = GetFirstAttributeOffset(); |
| |
| const uint32_t num_attributes = abbrevDecl->NumAttributes(); |
| for (uint32_t i = 0; i < num_attributes; ++i) { |
| DWARFFormValue form_value(cu); |
| dw_attr_t attr; |
| abbrevDecl->GetAttrAndFormValueByIndex(i, attr, form_value); |
| const dw_form_t form = form_value.Form(); |
| |
| // 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; |
| } |
| LLVM_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 { |
| llvm::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); |
| } |
| } |
| } else { |
| attributes.Clear(); |
| } |
| return attributes.Size(); |
| } |
| |
| // 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)) { |
| uint32_t attr_idx = abbrevDecl->FindAttributeIndex(attr); |
| |
| if (attr_idx != DW_INVALID_INDEX) { |
| 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; |
| } |
| |
| // 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; |
| } |
| |
| size_t DWARFDebugInfoEntry::GetAttributeAddressRanges( |
| DWARFUnit *cu, DWARFRangeList &ranges, bool check_hi_lo_pc, |
| bool check_specification_or_abstract_origin) const { |
| ranges.Clear(); |
| |
| DWARFFormValue form_value; |
| if (GetAttributeValue(cu, DW_AT_ranges, form_value)) { |
| ranges = GetRangesOrReportError(*cu, *this, form_value); |
| } else 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.GetSize(); |
| } |
| |
| // 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, ranges, |
| /*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, attributes, 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(); |
| } |
| |
| const char *DWARFDebugInfoEntry::GetQualifiedName(DWARFUnit *cu, |
| std::string &storage) const { |
| DWARFAttributes attributes; |
| GetAttributes(cu, attributes, Recurse::yes); |
| return GetQualifiedName(cu, attributes, storage); |
| } |
| |
| const char * |
| DWARFDebugInfoEntry::GetQualifiedName(DWARFUnit *cu, |
| const DWARFAttributes &attributes, |
| std::string &storage) const { |
| |
| const char *name = GetName(cu); |
| |
| if (name) { |
| DWARFDIE parent_decl_ctx_die = GetParentDeclContextDIE(cu); |
| storage.clear(); |
| // TODO: change this to get the correct decl context parent.... |
| while (parent_decl_ctx_die) { |
| const dw_tag_t parent_tag = parent_decl_ctx_die.Tag(); |
| switch (parent_tag) { |
| case DW_TAG_namespace: { |
| const char *namespace_name = parent_decl_ctx_die.GetName(); |
| if (namespace_name) { |
| storage.insert(0, "::"); |
| storage.insert(0, namespace_name); |
| } else { |
| storage.insert(0, "(anonymous namespace)::"); |
| } |
| parent_decl_ctx_die = parent_decl_ctx_die.GetParentDeclContextDIE(); |
| } break; |
| |
| case DW_TAG_class_type: |
| case DW_TAG_structure_type: |
| case DW_TAG_union_type: { |
| const char *class_union_struct_name = parent_decl_ctx_die.GetName(); |
| |
| if (class_union_struct_name) { |
| storage.insert(0, "::"); |
| storage.insert(0, class_union_struct_name); |
| } |
| parent_decl_ctx_die = parent_decl_ctx_die.GetParentDeclContextDIE(); |
| } break; |
| |
| default: |
| parent_decl_ctx_die.Clear(); |
| break; |
| } |
| } |
| |
| if (storage.empty()) |
| storage.append("::"); |
| |
| storage.append(name); |
| } |
| if (storage.empty()) |
| return nullptr; |
| return storage.c_str(); |
| } |
| |
| lldb::offset_t DWARFDebugInfoEntry::GetFirstAttributeOffset() const { |
| return GetOffset() + llvm::getULEB128Size(m_abbr_idx); |
| } |
| |
| const DWARFAbbreviationDeclaration * |
| DWARFDebugInfoEntry::GetAbbreviationDeclarationPtr(const DWARFUnit *cu) const { |
| if (cu) { |
| const DWARFAbbreviationDeclarationSet *abbrev_set = cu->GetAbbreviations(); |
| if (abbrev_set) |
| return abbrev_set->GetAbbreviationDeclaration(m_abbr_idx); |
| } |
| return nullptr; |
| } |
| |
| 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); |
| } |
