This revision was automatically updated to reflect the committed changes.
Closed by commit rGdc04b18ad7e4: [lldb][NFC] Factor out code from
SymbolFileDWARF::ParseVariableDIE (authored by fdeazeve).
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D154513/new/
https://reviews.llvm.org/D154513
Files:
lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
Index: lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
===================================================================
--- lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
+++ lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
@@ -3269,6 +3269,60 @@
return var_sp;
}
+/// Creates a DWARFExpressionList from an DW_AT_location form_value.
+static DWARFExpressionList GetExprListFromAtLocation(DWARFFormValue form_value,
+ ModuleSP module,
+ const DWARFDIE &die,
+ const addr_t func_low_pc) {
+ if (DWARFFormValue::IsBlockForm(form_value.Form())) {
+ const DWARFDataExtractor &data = die.GetData();
+
+ uint32_t block_offset = form_value.BlockData() - data.GetDataStart();
+ uint32_t block_length = form_value.Unsigned();
+ return DWARFExpressionList(
+ module, DataExtractor(data, block_offset, block_length), die.GetCU());
+ }
+
+ DWARFExpressionList location_list(module, DWARFExpression(), die.GetCU());
+ DataExtractor data = die.GetCU()->GetLocationData();
+ dw_offset_t offset = form_value.Unsigned();
+ if (form_value.Form() == DW_FORM_loclistx)
+ offset = die.GetCU()->GetLoclistOffset(offset).value_or(-1);
+ if (data.ValidOffset(offset)) {
+ data = DataExtractor(data, offset, data.GetByteSize() - offset);
+ const DWARFUnit *dwarf_cu = form_value.GetUnit();
+ if (DWARFExpression::ParseDWARFLocationList(dwarf_cu, data, &location_list))
+ location_list.SetFuncFileAddress(func_low_pc);
+ }
+
+ return location_list;
+}
+
+/// Creates a DWARFExpressionList from an DW_AT_const_value. This is either a
+/// block form, or a string, or a data form. For data forms, this returns an
+/// empty list, as we cannot initialize it properly without a SymbolFileType.
+static DWARFExpressionList
+GetExprListFromAtConstValue(DWARFFormValue form_value, ModuleSP module,
+ const DWARFDIE &die) {
+ const DWARFDataExtractor &debug_info_data = die.GetData();
+ if (DWARFFormValue::IsBlockForm(form_value.Form())) {
+ // Retrieve the value as a block expression.
+ uint32_t block_offset =
+ form_value.BlockData() - debug_info_data.GetDataStart();
+ uint32_t block_length = form_value.Unsigned();
+ return DWARFExpressionList(
+ module, DataExtractor(debug_info_data, block_offset, block_length),
+ die.GetCU());
+ }
+ if (const char *str = form_value.AsCString())
+ return DWARFExpressionList(module,
+ DataExtractor(str, strlen(str) + 1,
+ die.GetCU()->GetByteOrder(),
+ die.GetCU()->GetAddressByteSize()),
+ die.GetCU());
+ return DWARFExpressionList(module, DWARFExpression(), die.GetCU());
+}
+
VariableSP SymbolFileDWARF::ParseVariableDIE(const SymbolContext &sc,
const DWARFDIE &die,
const lldb::addr_t func_low_pc) {
@@ -3290,7 +3344,6 @@
const char *mangled = nullptr;
Declaration decl;
DWARFFormValue type_die_form;
- DWARFExpressionList location_list(module, DWARFExpression(), die.GetCU());
bool is_external = false;
bool is_artificial = false;
DWARFFormValue const_value_form, location_form;
@@ -3355,57 +3408,16 @@
// for static constexpr member variables -- DW_AT_const_value will be
// present in the class declaration and DW_AT_location in the DIE defining
// the member.
- bool location_is_const_value_data = false;
- bool has_explicit_location = location_form.IsValid();
- bool use_type_size_for_value = false;
- if (location_form.IsValid()) {
- if (DWARFFormValue::IsBlockForm(location_form.Form())) {
- const DWARFDataExtractor &data = die.GetData();
-
- uint32_t block_offset = location_form.BlockData() - data.GetDataStart();
- uint32_t block_length = location_form.Unsigned();
- location_list = DWARFExpressionList(
- module, DataExtractor(data, block_offset, block_length), die.GetCU());
- } else {
- DataExtractor data = die.GetCU()->GetLocationData();
- dw_offset_t offset = location_form.Unsigned();
- if (location_form.Form() == DW_FORM_loclistx)
- offset = die.GetCU()->GetLoclistOffset(offset).value_or(-1);
- if (data.ValidOffset(offset)) {
- data = DataExtractor(data, offset, data.GetByteSize() - offset);
- const DWARFUnit *dwarf_cu = location_form.GetUnit();
- if (DWARFExpression::ParseDWARFLocationList(dwarf_cu, data,
- &location_list))
- location_list.SetFuncFileAddress(func_low_pc);
- }
- }
- } else if (const_value_form.IsValid()) {
- location_is_const_value_data = true;
- // The constant value will be either a block, a data value or a
- // string.
- const DWARFDataExtractor &debug_info_data = die.GetData();
- if (DWARFFormValue::IsBlockForm(const_value_form.Form())) {
- // Retrieve the value as a block expression.
- uint32_t block_offset =
- const_value_form.BlockData() - debug_info_data.GetDataStart();
- uint32_t block_length = const_value_form.Unsigned();
- location_list = DWARFExpressionList(
- module, DataExtractor(debug_info_data, block_offset, block_length),
- die.GetCU());
- } else if (DWARFFormValue::IsDataForm(const_value_form.Form())) {
- // Constant value size does not have to match the size of the
- // variable. We will fetch the size of the type after we create
- // it.
- use_type_size_for_value = true;
- } else if (const char *str = const_value_form.AsCString()) {
- uint32_t string_length = strlen(str) + 1;
- location_list = DWARFExpressionList(
- module,
- DataExtractor(str, string_length, die.GetCU()->GetByteOrder(),
- die.GetCU()->GetAddressByteSize()),
- die.GetCU());
- }
- }
+ bool location_is_const_value_data =
+ const_value_form.IsValid() && !location_form.IsValid();
+
+ DWARFExpressionList location_list = [&] {
+ if (location_form.IsValid())
+ return GetExprListFromAtLocation(location_form, module, die, func_low_pc);
+ if (const_value_form.IsValid())
+ return GetExprListFromAtConstValue(const_value_form, module, die);
+ return DWARFExpressionList(module, DWARFExpression(), die.GetCU());
+ }();
const DWARFDIE parent_context_die = GetDeclContextDIEContainingDIE(die);
const DWARFDIE sc_parent_die = GetParentSymbolContextDIE(die);
@@ -3448,6 +3460,7 @@
// Clang likes to combine small global variables into the same symbol
// with locations like: DW_OP_addr(0x1000), DW_OP_constu(2), DW_OP_plus
// so we need to look through the whole expression.
+ bool has_explicit_location = location_form.IsValid();
bool is_static_lifetime =
has_explicit_mangled ||
(has_explicit_location && !location_list.IsValid());
@@ -3597,6 +3610,9 @@
auto type_sp = std::make_shared<SymbolFileType>(
*this, type_die_form.Reference().GetID());
+ bool use_type_size_for_value =
+ location_is_const_value_data &&
+ DWARFFormValue::IsDataForm(const_value_form.Form());
if (use_type_size_for_value && type_sp->GetType()) {
DWARFExpression *location = location_list.GetMutableExpressionAtAddress();
location->UpdateValue(const_value_form.Unsigned(),
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