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Revert "[lldb] [DWARF-5] Be lazier about loading .dwo files"

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This reverts commit e7b8ba103a.

It broke 32-bit ARM - lldb-arm-ubuntu, reported by omjavaid:
  https://lab.llvm.org/buildbot/#/builders/17/builds/9595
This commit is contained in:
Jan Kratochvil 2021-07-30 14:54:27 +02:00
parent 4b25c11321
commit d0e6d946b6
10 changed files with 97 additions and 222 deletions
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1
lldb/include/lldb/Symbol/CompileUnit.h
View file

@ -442,7 +442,6 @@ private:
CompileUnit(const CompileUnit &) = delete;
const CompileUnit &operator=(const CompileUnit &) = delete;
const char *GetCachedLanguage() const;
};
} // namespace lldb_private

116
lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp
View file

@ -35,12 +35,12 @@ DWARFUnit::DWARFUnit(SymbolFileDWARF &dwarf, lldb::user_id_t uid,
DIERef::Section section, bool is_dwo)
: UserID(uid), m_dwarf(dwarf), m_header(header), m_abbrevs(&abbrevs),
m_cancel_scopes(false), m_section(section), m_is_dwo(is_dwo),
m_has_parsed_non_skeleton_unit(false), m_dwo_id(header.GetDWOId()) {}
m_dwo_id(header.GetDWOId()) {}
DWARFUnit::~DWARFUnit() = default;
// Parses first DIE of a compile unit, excluding DWO.
void DWARFUnit::ExtractUnitDIENoDwoIfNeeded() {
// Parses first DIE of a compile unit.
void DWARFUnit::ExtractUnitDIEIfNeeded() {
{
llvm::sys::ScopedReader lock(m_first_die_mutex);
if (m_first_die)
@ -50,8 +50,7 @@ void DWARFUnit::ExtractUnitDIENoDwoIfNeeded() {
if (m_first_die)
return; // Already parsed
LLDB_SCOPED_TIMERF("%8.8x: DWARFUnit::ExtractUnitDIENoDwoIfNeeded()",
GetOffset());
LLDB_SCOPED_TIMERF("%8.8x: DWARFUnit::ExtractUnitDIEIfNeeded()", GetOffset());
// Set the offset to that of the first DIE and calculate the start of the
// next compilation unit header.
@ -67,58 +66,6 @@ void DWARFUnit::ExtractUnitDIENoDwoIfNeeded() {
}
}
// Parses first DIE of a compile unit including DWO.
void DWARFUnit::ExtractUnitDIEIfNeeded() {
ExtractUnitDIENoDwoIfNeeded();
if (m_has_parsed_non_skeleton_unit)
return;
m_has_parsed_non_skeleton_unit = true;
std::shared_ptr<SymbolFileDWARFDwo> dwo_symbol_file =
m_dwarf.GetDwoSymbolFileForCompileUnit(*this, m_first_die);
if (!dwo_symbol_file)
return;
DWARFUnit *dwo_cu = dwo_symbol_file->GetDWOCompileUnitForHash(m_dwo_id);
if (!dwo_cu)
return; // Can't fetch the compile unit from the dwo file.
dwo_cu->SetUserData(this);
DWARFBaseDIE dwo_cu_die = dwo_cu->GetUnitDIEOnly();
if (!dwo_cu_die.IsValid())
return; // Can't fetch the compile unit DIE from the dwo 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 (m_addr_base)
dwo_cu->SetAddrBase(*m_addr_base);
else if (m_gnu_addr_base)
dwo_cu->SetAddrBase(*m_gnu_addr_base);
if (GetVersion() <= 4 && m_gnu_ranges_base)
dwo_cu->SetRangesBase(*m_gnu_ranges_base);
else if (dwo_symbol_file->GetDWARFContext()
.getOrLoadRngListsData()
.GetByteSize() > 0)
dwo_cu->SetRangesBase(llvm::DWARFListTableHeader::getHeaderSize(DWARF32));
if (GetVersion() >= 5 &&
dwo_symbol_file->GetDWARFContext().getOrLoadLocListsData().GetByteSize() >
0)
dwo_cu->SetLoclistsBase(llvm::DWARFListTableHeader::getHeaderSize(DWARF32));
dwo_cu->SetBaseAddress(GetBaseAddress());
m_dwo = std::shared_ptr<DWARFUnit>(std::move(dwo_symbol_file), dwo_cu);
}
// 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() {
@ -344,12 +291,14 @@ void DWARFUnit::SetDwoStrOffsetsBase() {
}
uint64_t DWARFUnit::GetDWOId() {
ExtractUnitDIENoDwoIfNeeded();
ExtractUnitDIEIfNeeded();
return m_dwo_id;
}
// m_die_array_mutex must be already held as read/write.
void DWARFUnit::AddUnitDIE(const DWARFDebugInfoEntry &cu_die) {
llvm::Optional<uint64_t> addr_base, gnu_addr_base, gnu_ranges_base;
DWARFAttributes attributes;
size_t num_attributes = cu_die.GetAttributes(this, attributes);
@ -359,7 +308,8 @@ void DWARFUnit::AddUnitDIE(const DWARFDebugInfoEntry &cu_die) {
continue;
DWARFFormValue form_value;
if (attributes.ExtractFormValueAtIndex(i, form_value)) {
SetAddrBase(form_value.Unsigned());
addr_base = form_value.Unsigned();
SetAddrBase(*addr_base);
break;
}
}
@ -391,10 +341,10 @@ void DWARFUnit::AddUnitDIE(const DWARFDebugInfoEntry &cu_die) {
m_line_table_offset = form_value.Unsigned();
break;
case DW_AT_GNU_addr_base:
m_gnu_addr_base = form_value.Unsigned();
gnu_addr_base = form_value.Unsigned();
break;
case DW_AT_GNU_ranges_base:
m_gnu_ranges_base = form_value.Unsigned();
gnu_ranges_base = form_value.Unsigned();
break;
case DW_AT_GNU_dwo_id:
m_dwo_id = form_value.Unsigned();
@ -403,10 +353,50 @@ void DWARFUnit::AddUnitDIE(const DWARFDebugInfoEntry &cu_die) {
}
if (m_is_dwo) {
m_has_parsed_non_skeleton_unit = true;
SetDwoStrOffsetsBase();
return;
}
std::shared_ptr<SymbolFileDWARFDwo> dwo_symbol_file =
m_dwarf.GetDwoSymbolFileForCompileUnit(*this, cu_die);
if (!dwo_symbol_file)
return;
DWARFUnit *dwo_cu = dwo_symbol_file->GetDWOCompileUnitForHash(m_dwo_id);
if (!dwo_cu)
return; // Can't fetch the compile unit from the dwo file.
dwo_cu->SetUserData(this);
DWARFBaseDIE dwo_cu_die = dwo_cu->GetUnitDIEOnly();
if (!dwo_cu_die.IsValid())
return; // Can't fetch the compile unit DIE from the dwo 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)
dwo_cu->SetAddrBase(*addr_base);
else if (gnu_addr_base)
dwo_cu->SetAddrBase(*gnu_addr_base);
if (GetVersion() <= 4 && gnu_ranges_base)
dwo_cu->SetRangesBase(*gnu_ranges_base);
else if (dwo_symbol_file->GetDWARFContext()
.getOrLoadRngListsData()
.GetByteSize() > 0)
dwo_cu->SetRangesBase(llvm::DWARFListTableHeader::getHeaderSize(DWARF32));
if (GetVersion() >= 5 &&
dwo_symbol_file->GetDWARFContext().getOrLoadLocListsData().GetByteSize() >
0)
dwo_cu->SetLoclistsBase(llvm::DWARFListTableHeader::getHeaderSize(DWARF32));
dwo_cu->SetBaseAddress(GetBaseAddress());
m_dwo = std::shared_ptr<DWARFUnit>(std::move(dwo_symbol_file), dwo_cu);
}
size_t DWARFUnit::GetDebugInfoSize() const {
@ -422,7 +412,7 @@ dw_offset_t DWARFUnit::GetAbbrevOffset() const {
}
dw_offset_t DWARFUnit::GetLineTableOffset() {
ExtractUnitDIENoDwoIfNeeded();
ExtractUnitDIEIfNeeded();
return m_line_table_offset;
}

14
lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.h
View file

@ -92,7 +92,6 @@ public:
uint64_t GetDWOId();
void ExtractUnitDIEIfNeeded();
void ExtractUnitDIENoDwoIfNeeded();
void ExtractDIEsIfNeeded();
class ScopedExtractDIEs {
@ -152,7 +151,7 @@ public:
const DWARFAbbreviationDeclarationSet *GetAbbreviations() const;
dw_offset_t GetAbbrevOffset() const;
uint8_t GetAddressByteSize() const { return m_header.GetAddressByteSize(); }
dw_addr_t GetAddrBase() const { return m_addr_base ? *m_addr_base : 0; }
dw_addr_t GetAddrBase() const { return m_addr_base; }
dw_addr_t GetBaseAddress() const { return m_base_addr; }
dw_offset_t GetLineTableOffset();
dw_addr_t GetRangesBase() const { return m_ranges_base; }
@ -269,7 +268,7 @@ protected:
// Get the DWARF unit DWARF debug information entry. Parse the single DIE
// if needed.
const DWARFDebugInfoEntry *GetUnitDIEPtrOnly() {
ExtractUnitDIENoDwoIfNeeded();
ExtractUnitDIEIfNeeded();
// m_first_die_mutex is not required as m_first_die is never cleared.
if (!m_first_die)
return NULL;
@ -316,11 +315,9 @@ protected:
lldb_private::LazyBool m_is_optimized = lldb_private::eLazyBoolCalculate;
llvm::Optional<lldb_private::FileSpec> m_comp_dir;
llvm::Optional<lldb_private::FileSpec> m_file_spec;
llvm::Optional<dw_addr_t> m_addr_base; ///< Value of DW_AT_addr_base.
dw_addr_t m_loclists_base = 0; ///< Value of DW_AT_loclists_base.
dw_addr_t m_ranges_base = 0; ///< Value of DW_AT_rnglists_base.
llvm::Optional<uint64_t> m_gnu_addr_base;
llvm::Optional<uint64_t> m_gnu_ranges_base;
dw_addr_t m_addr_base = 0; ///< Value of DW_AT_addr_base.
dw_addr_t m_loclists_base = 0; ///< Value of DW_AT_loclists_base.
dw_addr_t m_ranges_base = 0; ///< Value of DW_AT_rnglists_base.
/// Value of DW_AT_stmt_list.
dw_offset_t m_line_table_offset = DW_INVALID_OFFSET;
@ -333,7 +330,6 @@ protected:
const DIERef::Section m_section;
bool m_is_dwo;
bool m_has_parsed_non_skeleton_unit;
/// Value of DW_AT_GNU_dwo_id (v4) or dwo_id from CU header (v5).
uint64_t m_dwo_id;

112
lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
View file

@ -687,17 +687,6 @@ static void MakeAbsoluteAndRemap(FileSpec &file_spec, DWARFUnit &dwarf_cu,
file_spec.SetFile(*remapped_file, FileSpec::Style::native);
}
/// Return the DW_AT_(GNU_)dwo_name.
static const char *GetDWOName(DWARFCompileUnit &dwarf_cu,
const DWARFDebugInfoEntry &cu_die) {
const char *dwo_name =
cu_die.GetAttributeValueAsString(&dwarf_cu, DW_AT_GNU_dwo_name, nullptr);
if (!dwo_name)
dwo_name =
cu_die.GetAttributeValueAsString(&dwarf_cu, DW_AT_dwo_name, nullptr);
return dwo_name;
}
lldb::CompUnitSP SymbolFileDWARF::ParseCompileUnit(DWARFCompileUnit &dwarf_cu) {
CompUnitSP cu_sp;
CompileUnit *comp_unit = (CompileUnit *)dwarf_cu.GetUserData();
@ -712,66 +701,25 @@ lldb::CompUnitSP SymbolFileDWARF::ParseCompileUnit(DWARFCompileUnit &dwarf_cu) {
} else {
ModuleSP module_sp(m_objfile_sp->GetModule());
if (module_sp) {
auto initialize_cu = [&](const FileSpec &file_spec,
LanguageType cu_language) {
const DWARFBaseDIE cu_die =
dwarf_cu.GetNonSkeletonUnit().GetUnitDIEOnly();
if (cu_die) {
FileSpec cu_file_spec(cu_die.GetName(), dwarf_cu.GetPathStyle());
MakeAbsoluteAndRemap(cu_file_spec, dwarf_cu, module_sp);
LanguageType cu_language = SymbolFileDWARF::LanguageTypeFromDWARF(
cu_die.GetAttributeValueAsUnsigned(DW_AT_language, 0));
bool is_optimized = dwarf_cu.GetNonSkeletonUnit().GetIsOptimized();
BuildCuTranslationTable();
cu_sp = std::make_shared<CompileUnit>(
module_sp, &dwarf_cu, file_spec,
module_sp, &dwarf_cu, cu_file_spec,
*GetDWARFUnitIndex(dwarf_cu.GetID()), cu_language,
eLazyBoolCalculate);
is_optimized ? eLazyBoolYes : eLazyBoolNo);
dwarf_cu.SetUserData(cu_sp.get());
SetCompileUnitAtIndex(dwarf_cu.GetID(), cu_sp);
};
auto lazy_initialize_cu = [&]() {
// If the version is < 5, we can't do lazy initialization.
if (dwarf_cu.GetVersion() < 5)
return false;
// If there is no DWO, there is no reason to initialize
// lazily; we will do eager initialization in that case.
if (GetDebugMapSymfile())
return false;
const DWARFBaseDIE cu_die = dwarf_cu.GetUnitDIEOnly();
if (!cu_die)
return false;
if (!GetDWOName(dwarf_cu, *cu_die.GetDIE()))
return false;
// With DWARFv5 we can assume that the first support
// file is also the name of the compile unit. This
// allows us to avoid loading the non-skeleton unit,
// which may be in a separate DWO file.
FileSpecList support_files;
if (!ParseSupportFiles(dwarf_cu, module_sp, support_files))
return false;
if (support_files.GetSize() == 0)
return false;
initialize_cu(support_files.GetFileSpecAtIndex(0),
eLanguageTypeUnknown);
cu_sp->SetSupportFiles(std::move(support_files));
return true;
};
if (!lazy_initialize_cu()) {
// Eagerly initialize compile unit
const DWARFBaseDIE cu_die =
dwarf_cu.GetNonSkeletonUnit().GetUnitDIEOnly();
if (cu_die) {
LanguageType cu_language = SymbolFileDWARF::LanguageTypeFromDWARF(
dwarf_cu.GetDWARFLanguageType());
FileSpec cu_file_spec(cu_die.GetName(), dwarf_cu.GetPathStyle());
// Path needs to be remapped in this case. In the support files
// case ParseSupportFiles takes care of the remapping.
MakeAbsoluteAndRemap(cu_file_spec, dwarf_cu, module_sp);
initialize_cu(cu_file_spec, cu_language);
}
}
}
}
@ -859,7 +807,7 @@ lldb::LanguageType SymbolFileDWARF::ParseLanguage(CompileUnit &comp_unit) {
std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
DWARFUnit *dwarf_cu = GetDWARFCompileUnit(&comp_unit);
if (dwarf_cu)
return GetLanguage(dwarf_cu->GetNonSkeletonUnit());
return GetLanguage(*dwarf_cu);
else
return eLanguageTypeUnknown;
}
@ -950,29 +898,18 @@ bool SymbolFileDWARF::ParseSupportFiles(CompileUnit &comp_unit,
if (!dwarf_cu)
return false;
if (!ParseSupportFiles(*dwarf_cu, comp_unit.GetModule(), support_files))
return false;
comp_unit.SetSupportFiles(support_files);
return true;
}
bool SymbolFileDWARF::ParseSupportFiles(DWARFUnit &dwarf_cu,
const ModuleSP &module,
FileSpecList &support_files) {
dw_offset_t offset = dwarf_cu.GetLineTableOffset();
dw_offset_t offset = dwarf_cu->GetLineTableOffset();
if (offset == DW_INVALID_OFFSET)
return false;
llvm::DWARFDebugLine::Prologue prologue;
if (!ParseLLVMLineTablePrologue(m_context, prologue, offset,
dwarf_cu.GetOffset()))
dwarf_cu->GetOffset()))
return false;
support_files = ParseSupportFilesFromPrologue(
module, prologue, dwarf_cu.GetPathStyle(),
dwarf_cu.GetCompilationDirectory().GetCString());
comp_unit.SetSupportFiles(ParseSupportFilesFromPrologue(
comp_unit.GetModule(), prologue, dwarf_cu->GetPathStyle(),
dwarf_cu->GetCompilationDirectory().GetCString()));
return true;
}
@ -1028,7 +965,7 @@ bool SymbolFileDWARF::ParseIsOptimized(CompileUnit &comp_unit) {
std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
DWARFUnit *dwarf_cu = GetDWARFCompileUnit(&comp_unit);
if (dwarf_cu)
return dwarf_cu->GetNonSkeletonUnit().GetIsOptimized();
return dwarf_cu->GetIsOptimized();
return false;
}
@ -1648,6 +1585,17 @@ SymbolFileDWARF::GetDIE(const DIERef &die_ref) {
return DebugInfo().GetDIE(die_ref);
}
/// Return the DW_AT_(GNU_)dwo_name.
static const char *GetDWOName(DWARFCompileUnit &dwarf_cu,
const DWARFDebugInfoEntry &cu_die) {
const char *dwo_name =
cu_die.GetAttributeValueAsString(&dwarf_cu, DW_AT_GNU_dwo_name, nullptr);
if (!dwo_name)
dwo_name =
cu_die.GetAttributeValueAsString(&dwarf_cu, DW_AT_dwo_name, nullptr);
return dwo_name;
}
/// Return the DW_AT_(GNU_)dwo_id.
/// FIXME: Technically 0 is a valid hash.
static uint64_t GetDWOId(DWARFCompileUnit &dwarf_cu,

3
lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.h
View file

@ -368,9 +368,6 @@ protected:
lldb::TypeSP ParseType(const lldb_private::SymbolContext &sc,
const DWARFDIE &die, bool *type_is_new);
bool ParseSupportFiles(DWARFUnit &dwarf_cu, const lldb::ModuleSP &module,
lldb_private::FileSpecList &support_files);
lldb_private::Type *ResolveTypeUID(const DWARFDIE &die,
bool assert_not_being_parsed);

10
lldb/source/Symbol/CompileUnit.cpp
View file

@ -52,7 +52,7 @@ void CompileUnit::DumpSymbolContext(Stream *s) {
void CompileUnit::GetDescription(Stream *s,
lldb::DescriptionLevel level) const {
const char *language = GetCachedLanguage();
const char *language = Language::GetNameForLanguageType(m_language);
*s << "id = " << (const UserID &)*this << ", file = \""
<< this->GetPrimaryFile() << "\", language = \"" << language << '"';
}
@ -97,18 +97,12 @@ lldb::FunctionSP CompileUnit::FindFunction(
return {};
}
const char *CompileUnit::GetCachedLanguage() const {
if (m_flags.IsClear(flagsParsedLanguage))
return "<not loaded>";
return Language::GetNameForLanguageType(m_language);
}
// Dump the current contents of this object. No functions that cause on demand
// parsing of functions, globals, statics are called, so this is a good
// function to call to get an idea of the current contents of the CompileUnit
// object.
void CompileUnit::Dump(Stream *s, bool show_context) const {
const char *language = GetCachedLanguage();
const char *language = Language::GetNameForLanguageType(m_language);
s->Printf("%p: ", static_cast<const void *>(this));
s->Indent();

30
lldb/test/Shell/SymbolFile/DWARF/dwarf5-lazy-dwo.c
View file

@ -1,30 +0,0 @@
// Test we load dwo information lazily.
// RUN: %clang_host %s -fno-standalone-debug -g \
// RUN: -gdwarf-5 -gpubnames -gsplit-dwarf -c -o %t1.o -DONE
// RUN: %clang_host %s -fno-standalone-debug -g \
// RUN: -gdwarf-5 -gpubnames -gsplit-dwarf -c -o %t2.o -DTWO
// RUN: %clang_host %t1.o %t2.o -o %t
// RUN: %lldb %t -o "log enable ll""db object" -o "settings set stop-line-count-before 0" \
// RUN: -o "b main" -o "run" -o "image lookup -n main -v" -b | FileCheck %s
// CHECK-NOT: 2.dwo,
// CHECK: (lldb) b main
// CHECK-NOT: 2.dwo,
// CHECK: 1.dwo,
// CHECK-NOT: 2.dwo,
// CHECK: (lldb) run
// CHECK-NOT: 2.dwo,
// CHECK: stop reason = breakpoint
// CHECK-NOT: 2.dwo,
// CHECK: (lldb) image lookup
// CHECK-NOT: 2.dwo,
// CHECK: CompileUnit: id = {0x00000000}, file =
// CHECK-SAME: language = "c99"
// CHECK-NOT: 2.dwo,
#ifdef ONE
int main() { return 0; }
#else
int x;
#endif

2
lldb/test/Shell/SymbolFile/DWARF/lit.local.cfg
View file

@ -1 +1 @@
config.suffixes = ['.cpp', '.m', '.mm', '.s', '.test', '.ll', '.c']
config.suffixes = ['.cpp', '.m', '.mm', '.s', '.test', '.ll']

19
lldb/test/Shell/SymbolFile/DWARF/split-optimized.c
View file

@ -1,19 +0,0 @@
// Test that optimized flag is properly included in DWARF.
// RUN: %clang_host %s -fno-standalone-debug -glldb \
// RUN: -gdwarf-5 -gpubnames -gsplit-dwarf -O3 -c -o %t1.o
// RUN: llvm-dwarfdump %t1.o | FileCheck %s --check-prefix DWARFDUMP_O
// RUN: llvm-dwarfdump %t1.dwo | FileCheck %s --check-prefix DWARFDUMP_DWO
// RUN: %lldb -b -o 'script lldb.SBDebugger.Create().CreateTarget("%t1.o").FindFunctions("main",lldb.eFunctionNameTypeAuto).GetContextAtIndex(0).GetFunction().GetIsOptimized()' | FileCheck %s
// DWARFDUMP_O-NOT: DW_AT_APPLE_optimized
//
// DWARFDUMP_DWO: DW_TAG_compile_unit
// DWARFDUMP_DWO-NOT: DW_TAG_
// DWARFDUMP_DWO: DW_AT_APPLE_optimized (true)
// CHECK: (lldb) script lldb.SBDebugger.Create()
// CHECK-NEXT: True
int main(void) { return 0; }

12
lldb/test/Shell/SymbolFile/DWARF/x86/dwp.s
View file

@ -10,40 +10,40 @@
# CHECK: (INT3) A = 3
# CHECK-LABEL: image lookup -v -n F1
# CHECK: CompileUnit: id = {0x00000001}, file = "1.c", language = "<not loaded>"
# CHECK: CompileUnit: id = {0x00000001}, file = "1.c", language = "unknown"
# CHECK: Function: {{.*}}, name = "F1", range = [0x0000000000000001-0x0000000000000002)
# CHECK: Variable: {{.*}}, name = "x", type = "int", location = DW_OP_reg1 RDX
# SYMBOLS: Compile units:
# SYMBOLS-NEXT: CompileUnit{0x00000000}, language = "<not loaded>", file = '0.c'
# SYMBOLS-NEXT: CompileUnit{0x00000000}, language = "unknown", file = '0.c'
# SYMBOLS-NEXT: Variable{{.*}}, name = "A", {{.*}}, location = DW_OP_GNU_addr_index 0x0
# SYMBOLS-NEXT: Function{{.*}}, demangled = F0
# SYMBOLS-NEXT: Block{{.*}}, ranges = [0x00000000-0x00000001)
# SYMBOLS-NEXT: Variable{{.*}}, name = "x", {{.*}}, location =
# SYMBOLS-NEXT: DW_LLE_startx_length (0x0000000000000001, 0x0000000000000001): DW_OP_reg0 RAX
# SYMBOLS-EMPTY:
# SYMBOLS-NEXT: CompileUnit{0x00000001}, language = "<not loaded>", file = '1.c'
# SYMBOLS-NEXT: CompileUnit{0x00000001}, language = "unknown", file = '1.c'
# SYMBOLS-NEXT: Variable{{.*}}, name = "A", {{.*}}, location = DW_OP_GNU_addr_index 0x2
# SYMBOLS-NEXT: Function{{.*}}, demangled = F1
# SYMBOLS-NEXT: Block{{.*}}, ranges = [0x00000001-0x00000002)
# SYMBOLS-NEXT: Variable{{.*}}, name = "x", {{.*}}, location =
# SYMBOLS-NEXT: DW_LLE_startx_length (0x0000000000000003, 0x0000000000000001): DW_OP_reg1 RDX
# SYMBOLS-EMPTY:
# SYMBOLS-NEXT: CompileUnit{0x00000002}, language = "<not loaded>", file = '2.c'
# SYMBOLS-NEXT: CompileUnit{0x00000002}, language = "unknown", file = '2.c'
# SYMBOLS-NEXT: Variable{{.*}}, name = "A", {{.*}}, location = DW_OP_GNU_addr_index 0x4
# SYMBOLS-NEXT: Function{{.*}}, demangled = F2
# SYMBOLS-NEXT: Block{{.*}}, ranges = [0x00000002-0x00000003)
# SYMBOLS-NEXT: Variable{{.*}}, name = "x", {{.*}}, location =
# SYMBOLS-NEXT: DW_LLE_startx_length (0x0000000000000005, 0x0000000000000001): DW_OP_reg2 RCX
# SYMBOLS-EMPTY:
# SYMBOLS-NEXT: CompileUnit{0x00000003}, language = "<not loaded>", file = '3.c'
# SYMBOLS-NEXT: CompileUnit{0x00000003}, language = "unknown", file = '3.c'
# SYMBOLS-NEXT: Variable{{.*}}, name = "A", {{.*}}, location = DW_OP_GNU_addr_index 0x6
# SYMBOLS-NEXT: Function{{.*}}, demangled = F3
# SYMBOLS-NEXT: Block{{.*}}, ranges = [0x00000003-0x00000004)
# SYMBOLS-NEXT: Variable{{.*}}, name = "x", {{.*}}, location =
# SYMBOLS-NEXT: DW_LLE_startx_length (0x0000000000000007, 0x0000000000000001): DW_OP_reg3 RBX
# SYMBOLS-EMPTY:
# SYMBOLS-NEXT: CompileUnit{0x00000004}, language = "<not loaded>", file = ''
# SYMBOLS-NEXT: CompileUnit{0x00000004}, language = "unknown", file = ''
# SYMBOLS-EMPTY:
.section .debug_abbrev,"",@progbits