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Differential D142552

[lldb] Make GetDIENamesAndRanges() allow 0-valued decl and call lines
ClosedPublic

Authored by dstenb on Jan 25 2023, 8:18 AM.

Details

Reviewers
jasonmolenda
clayborg
ayermolo
shafik
jdoerfert
Commits
rG98c3dc3fa748: [lldb] Make GetDIENamesAndRanges() allow 0-valued decl and call lines
Summary

In an upcoming patch, D142556, Clang is proposed to be changed to emit
line locations that are inlined at line 0. This clashed with the behavior of
GetDIENamesAndRanges() which used 0 as a default value to determine if
file, line or column numbers had been set. Users of that function then
checked for any non-0 values when setting up the call site:

if (call_file != 0 || call_line != 0 || call_column != 0)
  [...]

which did not work with the Clang change since all three values then
could be 0.

This changes the function to use std::optional to catch non-set values
instead.

Diff Detail

Event Timeline

dstenb created this revision.Jan 25 2023, 8:18 AM
Herald added a reviewer: shafik. · View Herald TranscriptJan 25 2023, 8:18 AM
Herald added a project: Restricted Project. · View Herald Transcript
Herald added a subscriber: JDevlieghere. · View Herald Transcript
dstenb requested review of this revision.Jan 25 2023, 8:18 AM
Herald added a reviewer: jdoerfert. · View Herald TranscriptJan 25 2023, 8:18 AM
Herald added subscribers: lldb-commits, sstefan1. · View Herald Transcript
dstenb added a comment.Jan 25 2023, 8:21 AM

First time looking at LLDB, so I had trouble finding a suitable way to create a reproducer for this. I would be happy to change to another type of lit test if that is more suitable.

Harbormaster completed remote builds in B209878: Diff 492121.Jan 25 2023, 8:21 AM
dstenb mentioned this in D142556: [DebugInfo] Merge partially matching chains of inlined locations.Jan 25 2023, 8:26 AM
dstenb added a child revision: D142556: [DebugInfo] Merge partially matching chains of inlined locations.
dstenb edited the summary of this revision. (Show Details)Jan 25 2023, 8:37 AM
clayborg accepted this revision.Jan 26 2023, 1:40 PM

As long as there are no regressions in the test suite this looks good to me

This revision is now accepted and ready to land.Jan 26 2023, 1:40 PM
aeubanks removed a reviewer: aeubanks.Jan 26 2023, 1:52 PM
dstenb added a comment.Mar 6 2023, 5:22 AM
In D142552#4083939, @clayborg wrote:

As long as there are no regressions in the test suite this looks good to me

Thanks, and sorry for the delay with landing this! I have ran check-lldb. I will land this shortly.

Closed by commit rG98c3dc3fa748: [lldb] Make GetDIENamesAndRanges() allow 0-valued decl and call lines (authored by dstenb). · Explain WhyMar 6 2023, 5:37 AM
This revision was automatically updated to reflect the committed changes.
dstenb added a commit: rG98c3dc3fa748: [lldb] Make GetDIENamesAndRanges() allow 0-valued decl and call lines.
dstenb mentioned this in rG12a7aea6b022: [DebugInfo] Merge partially matching chains of inlined locations.

Revision Contents

PathSize
lldb/
source/
Plugins/
SymbolFile/
DWARF/
19 lines
12 lines
5 lines
6 lines
19 lines
26 lines
test/
Shell/
SymbolFile/
DWARF/
Inputs/
699 lines
34 lines

Diff 492121

lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp

Show First 20 Lines • Show All 2,401 Lines • ▼ Show 20 Lines
Function * Function *
DWARFASTParserClang::ParseFunctionFromDWARF(CompileUnit &comp_unit, DWARFASTParserClang::ParseFunctionFromDWARF(CompileUnit &comp_unit,
const DWARFDIE &die, const DWARFDIE &die,
const AddressRange &func_range) { const AddressRange &func_range) {
assert(func_range.GetBaseAddress().IsValid()); assert(func_range.GetBaseAddress().IsValid());
DWARFRangeList func_ranges; DWARFRangeList func_ranges;
const char *name = nullptr; const char *name = nullptr;
const char *mangled = nullptr; const char *mangled = nullptr;
int decl_file = 0; std::optional<int> decl_file;
int decl_line = 0; std::optional<int> decl_line;
int decl_column = 0; std::optional<int> decl_column;
int call_file = 0; std::optional<int> call_file;
int call_line = 0; std::optional<int> call_line;
int call_column = 0; std::optional<int> call_column;
DWARFExpressionList frame_base; DWARFExpressionList frame_base;
const dw_tag_t tag = die.Tag(); const dw_tag_t tag = die.Tag();
if (tag != DW_TAG_subprogram) if (tag != DW_TAG_subprogram)
return nullptr; return nullptr;
if (die.GetDIENamesAndRanges(name, mangled, func_ranges, decl_file, decl_line, if (die.GetDIENamesAndRanges(name, mangled, func_ranges, decl_file, decl_line,
Show All 13 Lines else if ((die.GetParent().Tag() == DW_TAG_compile_unit ||
// demangled name using the decl context. We skip if the function is // demangled name using the decl context. We skip if the function is
// "main" as its name is never mangled. // "main" as its name is never mangled.
func_name.SetValue(ConstructDemangledNameFromDWARF(die), false); func_name.SetValue(ConstructDemangledNameFromDWARF(die), false);
} else } else
func_name.SetValue(ConstString(name), false); func_name.SetValue(ConstString(name), false);
FunctionSP func_sp; FunctionSP func_sp;
std::unique_ptr<Declaration> decl_up; std::unique_ptr<Declaration> decl_up;
if (decl_file != 0 || decl_line != 0 || decl_column != 0) if (decl_file || decl_line || decl_column)
decl_up = std::make_unique<Declaration>(die.GetCU()->GetFile(decl_file), decl_up = std::make_unique<Declaration>(
decl_line, decl_column); die.GetCU()->GetFile(decl_file ? *decl_file : 0),
decl_line ? *decl_line : 0, decl_column ? *decl_column : 0);
SymbolFileDWARF *dwarf = die.GetDWARF(); SymbolFileDWARF *dwarf = die.GetDWARF();
// Supply the type _only_ if it has already been parsed // Supply the type _only_ if it has already been parsed
Type *func_type = dwarf->GetDIEToType().lookup(die.GetDIE()); Type *func_type = dwarf->GetDIEToType().lookup(die.GetDIE());
assert(func_type == nullptr || func_type != DIE_IS_BEING_PARSED); assert(func_type == nullptr || func_type != DIE_IS_BEING_PARSED);
const user_id_t func_user_id = die.GetID(); const user_id_t func_user_id = die.GetID();
▲ Show 20 Lines • Show All 1,212 Lines • Show Last 20 Lines

lldb/source/Plugins/SymbolFile/DWARF/DWARFDIE.h

Show First 20 Lines • Show All 77 Lines • ▼ Show 20 Linespublic:
// Getting attribute values from the DIE. // Getting attribute values from the DIE.
// //
// GetAttributeValueAsXXX() functions should only be used if you are // GetAttributeValueAsXXX() functions should only be used if you are
// looking for one or two attributes on a DIE. If you are trying to // looking for one or two attributes on a DIE. If you are trying to
// parse all attributes, use GetAttributes (...) instead // parse all attributes, use GetAttributes (...) instead
DWARFDIE DWARFDIE
GetAttributeValueAsReferenceDIE(const dw_attr_t attr) const; GetAttributeValueAsReferenceDIE(const dw_attr_t attr) const;
bool bool GetDIENamesAndRanges(
GetDIENamesAndRanges(const char *&name, const char *&mangled, const char *&name, const char *&mangled, DWARFRangeList &ranges,
DWARFRangeList &ranges, int &decl_file, int &decl_line, std::optional<int> &decl_file, std::optional<int> &decl_line,
int &decl_column, int &call_file, int &call_line, std::optional<int> &decl_column, std::optional<int> &call_file,
int &call_column, std::optional<int> &call_line, std::optional<int> &call_column,
lldb_private::DWARFExpressionList *frame_base) const; lldb_private::DWARFExpressionList *frame_base) const;
/// The range of all the children of this DIE. /// The range of all the children of this DIE.
llvm::iterator_range<child_iterator> children() const; llvm::iterator_range<child_iterator> children() const;
}; };
class DWARFDIE::child_iterator class DWARFDIE::child_iterator
: public llvm::iterator_facade_base<DWARFDIE::child_iterator, : public llvm::iterator_facade_base<DWARFDIE::child_iterator,
std::forward_iterator_tag, DWARFDIE> { std::forward_iterator_tag, DWARFDIE> {
Show All 31 Lines

lldb/source/Plugins/SymbolFile/DWARF/DWARFDIE.cpp

Show First 20 Lines • Show All 433 Lines • ▼ Show 20 Linesbool DWARFDIE::IsMethod() const {
for (DWARFDIE d : elaborating_dies(*this)) for (DWARFDIE d : elaborating_dies(*this))
if (d.GetParent().IsStructUnionOrClass()) if (d.GetParent().IsStructUnionOrClass())
return true; return true;
return false; return false;
} }
bool DWARFDIE::GetDIENamesAndRanges( bool DWARFDIE::GetDIENamesAndRanges(
const char *&name, const char *&mangled, DWARFRangeList &ranges, const char *&name, const char *&mangled, DWARFRangeList &ranges,
int &decl_file, int &decl_line, int &decl_column, int &call_file, std::optional<int> &decl_file, std::optional<int> &decl_line,
int &call_line, int &call_column, std::optional<int> &decl_column, std::optional<int> &call_file,
std::optional<int> &call_line, std::optional<int> &call_column,
lldb_private::DWARFExpressionList *frame_base) const { lldb_private::DWARFExpressionList *frame_base) const {
if (IsValid()) { if (IsValid()) {
return m_die->GetDIENamesAndRanges( return m_die->GetDIENamesAndRanges(
GetCU(), name, mangled, ranges, decl_file, decl_line, decl_column, GetCU(), name, mangled, ranges, decl_file, decl_line, decl_column,
call_file, call_line, call_column, frame_base); call_file, call_line, call_column, frame_base);
} else } else
return false; return false;
} }
llvm::iterator_range<DWARFDIE::child_iterator> DWARFDIE::children() const { llvm::iterator_range<DWARFDIE::child_iterator> DWARFDIE::children() const {
return llvm::make_range(child_iterator(*this), child_iterator()); return llvm::make_range(child_iterator(*this), child_iterator());
} }

lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugInfoEntry.h

Show First 20 Lines • Show All 96 Lines • ▼ Show 20 Linespublic:
const char *GetMangledName(const DWARFUnit *cu, const char *GetMangledName(const DWARFUnit *cu,
bool substitute_name_allowed = true) const; bool substitute_name_allowed = true) const;
const char *GetPubname(const DWARFUnit *cu) const; const char *GetPubname(const DWARFUnit *cu) const;
bool GetDIENamesAndRanges( bool GetDIENamesAndRanges(
DWARFUnit *cu, const char *&name, const char *&mangled, DWARFUnit *cu, const char *&name, const char *&mangled,
DWARFRangeList &rangeList, int &decl_file, int &decl_line, DWARFRangeList &rangeList, std::optional<int> &decl_file,
int &decl_column, int &call_file, int &call_line, int &call_column, 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,
lldb_private::DWARFExpressionList *frame_base = nullptr) const; lldb_private::DWARFExpressionList *frame_base = nullptr) const;
const DWARFAbbreviationDeclaration * const DWARFAbbreviationDeclaration *
GetAbbreviationDeclarationPtr(const DWARFUnit *cu) const; GetAbbreviationDeclarationPtr(const DWARFUnit *cu) const;
lldb::offset_t GetFirstAttributeOffset() const; lldb::offset_t GetFirstAttributeOffset() const;
dw_tag_t Tag() const { return m_tag; } dw_tag_t Tag() const { return m_tag; }
▲ Show 20 Lines • Show All 72 Lines • Show Last 20 Lines

lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugInfoEntry.cpp

Show First 20 Lines • Show All 228 Lines • ▼ Show 20 Lines
} }
// GetDIENamesAndRanges // GetDIENamesAndRanges
// //
// Gets the valid address ranges for a given DIE by looking for a // 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. // DW_AT_low_pc/DW_AT_high_pc pair, DW_AT_entry_pc, or DW_AT_ranges attributes.
bool DWARFDebugInfoEntry::GetDIENamesAndRanges( bool DWARFDebugInfoEntry::GetDIENamesAndRanges(
DWARFUnit *cu, const char *&name, const char *&mangled, DWARFUnit *cu, const char *&name, const char *&mangled,
DWARFRangeList &ranges, int &decl_file, int &decl_line, int &decl_column, DWARFRangeList &ranges, std::optional<int> &decl_file,
int &call_file, int &call_line, int &call_column, std::optional<int> &decl_line, std::optional<int> &decl_column,
DWARFExpressionList *frame_base) const { 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 lo_pc = LLDB_INVALID_ADDRESS;
dw_addr_t hi_pc = LLDB_INVALID_ADDRESS; dw_addr_t hi_pc = LLDB_INVALID_ADDRESS;
std::vector<DWARFDIE> dies; std::vector<DWARFDIE> dies;
bool set_frame_base_loclist_addr = false; bool set_frame_base_loclist_addr = false;
const auto *abbrevDecl = GetAbbreviationDeclarationPtr(cu); const auto *abbrevDecl = GetAbbreviationDeclarationPtr(cu);
SymbolFileDWARF &dwarf = cu->GetSymbolFileDWARF(); SymbolFileDWARF &dwarf = cu->GetSymbolFileDWARF();
▲ Show 20 Lines • Show All 62 Lines • ▼ Show 20 Lines for (uint32_t i = 0; i < numAttributes; ++i) {
dies.push_back(form_value.Reference()); dies.push_back(form_value.Reference());
break; break;
case DW_AT_specification: case DW_AT_specification:
dies.push_back(form_value.Reference()); dies.push_back(form_value.Reference());
break; break;
case DW_AT_decl_file: case DW_AT_decl_file:
if (decl_file == 0) if (!decl_file)
decl_file = form_value.Unsigned(); decl_file = form_value.Unsigned();
break; break;
case DW_AT_decl_line: case DW_AT_decl_line:
if (decl_line == 0) if (!decl_line)
decl_line = form_value.Unsigned(); decl_line = form_value.Unsigned();
break; break;
case DW_AT_decl_column: case DW_AT_decl_column:
if (decl_column == 0) if (!decl_column)
decl_column = form_value.Unsigned(); decl_column = form_value.Unsigned();
break; break;
case DW_AT_call_file: case DW_AT_call_file:
if (call_file == 0) if (!call_file)
call_file = form_value.Unsigned(); call_file = form_value.Unsigned();
break; break;
case DW_AT_call_line: case DW_AT_call_line:
if (call_line == 0) if (!call_line)
call_line = form_value.Unsigned(); call_line = form_value.Unsigned();
break; break;
case DW_AT_call_column: case DW_AT_call_column:
if (call_column == 0) if (!call_column)
call_column = form_value.Unsigned(); call_column = form_value.Unsigned();
break; break;
case DW_AT_frame_base: case DW_AT_frame_base:
if (frame_base) { if (frame_base) {
if (form_value.BlockData()) { if (form_value.BlockData()) {
uint32_t block_offset = uint32_t block_offset =
form_value.BlockData() - data.GetDataStart(); form_value.BlockData() - data.GetDataStart();
▲ Show 20 Lines • Show All 501 Lines • Show Last 20 Lines

lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp

Show First 20 Lines • Show All 1,273 Lines • ▼ Show 20 Lines case DW_TAG_lexical_block: {
BlockSP block_sp(new Block(die.GetID())); BlockSP block_sp(new Block(die.GetID()));
parent_block->AddChild(block_sp); parent_block->AddChild(block_sp);
block = block_sp.get(); block = block_sp.get();
} }
DWARFRangeList ranges; DWARFRangeList ranges;
const char *name = nullptr; const char *name = nullptr;
const char *mangled_name = nullptr; const char *mangled_name = nullptr;
int decl_file = 0; std::optional<int> decl_file;
int decl_line = 0; std::optional<int> decl_line;
int decl_column = 0; std::optional<int> decl_column;
int call_file = 0; std::optional<int> call_file;
int call_line = 0; std::optional<int> call_line;
int call_column = 0; std::optional<int> call_column;
if (die.GetDIENamesAndRanges(name, mangled_name, ranges, decl_file, if (die.GetDIENamesAndRanges(name, mangled_name, ranges, decl_file,
decl_line, decl_column, call_file, call_line, decl_line, decl_column, call_file, call_line,
call_column, nullptr)) { call_column, nullptr)) {
if (tag == DW_TAG_subprogram) { if (tag == DW_TAG_subprogram) {
assert(subprogram_low_pc == LLDB_INVALID_ADDRESS); assert(subprogram_low_pc == LLDB_INVALID_ADDRESS);
subprogram_low_pc = ranges.GetMinRangeBase(0); subprogram_low_pc = ranges.GetMinRangeBase(0);
} else if (tag == DW_TAG_inlined_subroutine) { } else if (tag == DW_TAG_inlined_subroutine) {
// We get called here for inlined subroutines in two ways. The first // We get called here for inlined subroutines in two ways. The first
Show All 26 Lines case DW_TAG_lexical_block: {
subprogram_low_pc); subprogram_low_pc);
} }
} }
block->FinalizeRanges(); block->FinalizeRanges();
if (tag != DW_TAG_subprogram && if (tag != DW_TAG_subprogram &&
(name != nullptr || mangled_name != nullptr)) { (name != nullptr || mangled_name != nullptr)) {
std::unique_ptr<Declaration> decl_up; std::unique_ptr<Declaration> decl_up;
if (decl_file != 0 || decl_line != 0 || decl_column != 0) if (decl_file || decl_line || decl_column)
decl_up = std::make_unique<Declaration>( decl_up = std::make_unique<Declaration>(
comp_unit.GetSupportFiles().GetFileSpecAtIndex(decl_file), comp_unit.GetSupportFiles().GetFileSpecAtIndex(
decl_line, decl_column); decl_file ? *decl_file : 0),
decl_line ? *decl_line : 0, decl_column ? *decl_column : 0);
std::unique_ptr<Declaration> call_up; std::unique_ptr<Declaration> call_up;
if (call_file != 0 || call_line != 0 || call_column != 0) if (call_file || call_line || call_column)
call_up = std::make_unique<Declaration>( call_up = std::make_unique<Declaration>(
comp_unit.GetSupportFiles().GetFileSpecAtIndex(call_file), comp_unit.GetSupportFiles().GetFileSpecAtIndex(
call_line, call_column); call_file ? *call_file : 0),
call_line ? *call_line : 0, call_column ? *call_column : 0);
block->SetInlinedFunctionInfo(name, mangled_name, decl_up.get(), block->SetInlinedFunctionInfo(name, mangled_name, decl_up.get(),
call_up.get()); call_up.get());
} }
++blocks_added; ++blocks_added;
if (die.HasChildren()) { if (die.HasChildren()) {
▲ Show 20 Lines • Show All 2,927 Lines • Show Last 20 Lines

lldb/test/Shell/SymbolFile/DWARF/Inputs/inlined-file0-line0-col0.yaml

  • This file was added.
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- clang version 16.0.0.prerel
- inlined-file0-line0-col0.c
- '/tmp/tmp.o5FdSk4Xkz'
- g1
- int
- g2
- bar
- q
- foo
- abort
- main
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...

lldb/test/Shell/SymbolFile/DWARF/inlined-file0-line0-col0.test

  • This file was added.
# RUN: yaml2obj %S/Inputs/inlined-file0-line0-col0.yaml -o %t
# RUN: %lldb %t -s %s -o exit | FileCheck %s
# 1 void abort(void);
# 2 int g1 = 4, g2 = 6;
# 3
# 4 inline __attribute__((always_inline)) void bar(int q) {
# 5 if (q > 5)
# 6 abort();
# 7 }
# 8
# 9 inline __attribute__((always_inline)) void foo(int q) {
# 10 bar(q);
# 11 }
# 12
# 13 int main() {
# 14 foo(g1);
# 15 foo(g2);
# 16 return 0;
# 17 }
# The input object file contains a single abort invocation for the two inlined
# instances of foo() in main() at line 0. As the file, line and column numbers
# are all 0, file and line number information would be missing for foo and main
# in the lookup information.
#
# A line number 0 is not printed for main in this case, but the same holds
# for a non-inlined location with line number 0.
# CHECK: Summary: inlined-file0-line0-col0.test.tmp`main + 30 [inlined] bar + 4 at inlined-file0-line0-col0.c:6:5
# CHECK-NEXT: inlined-file0-line0-col0.test.tmp`main + 26 [inlined] foo at inlined-file0-line0-col0.c:10:3
# CHECK-NEXT: inlined-file0-line0-col0.test.tmp`main + 26 at inlined-file0-line0-col0.c
image lookup -a 0x1e