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[lldb] Do not use LC_FUNCTION_STARTS data to determine symbol size as symbols are created #106791

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Sep 13, 2024
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[lldb] Do not use LC_FUNCTION_STARTS data to determine symbol size as symbols are created #106791

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63 changes: 0 additions & 63 deletions lldb/source/Plugins/ObjectFile/Mach-O/ObjectFileMachO.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3768,7 +3768,6 @@ void ObjectFileMachO::ParseSymtab(Symtab &symtab) {

SymbolType type = eSymbolTypeInvalid;
SectionSP symbol_section;
lldb::addr_t symbol_byte_size = 0;
bool add_nlist = true;
bool is_gsym = false;
bool demangled_is_synthesized = false;
Expand Down Expand Up @@ -4354,47 +4353,6 @@ void ObjectFileMachO::ParseSymtab(Symtab &symtab) {

if (symbol_section) {
const addr_t section_file_addr = symbol_section->GetFileAddress();
if (symbol_byte_size == 0 && function_starts_count > 0) {
addr_t symbol_lookup_file_addr = nlist.n_value;
// Do an exact address match for non-ARM addresses, else get the
// closest since the symbol might be a thumb symbol which has an
// address with bit zero set.
FunctionStarts::Entry *func_start_entry =
function_starts.FindEntry(symbol_lookup_file_addr, !is_arm);
if (is_arm && func_start_entry) {
// Verify that the function start address is the symbol address
// (ARM) or the symbol address + 1 (thumb).
if (func_start_entry->addr != symbol_lookup_file_addr &&
func_start_entry->addr != (symbol_lookup_file_addr + 1)) {
// Not the right entry, NULL it out...
func_start_entry = nullptr;
}
}
if (func_start_entry) {
func_start_entry->data = true;

addr_t symbol_file_addr = func_start_entry->addr;
if (is_arm)
symbol_file_addr &= THUMB_ADDRESS_BIT_MASK;

const FunctionStarts::Entry *next_func_start_entry =
function_starts.FindNextEntry(func_start_entry);
const addr_t section_end_file_addr =
section_file_addr + symbol_section->GetByteSize();
if (next_func_start_entry) {
addr_t next_symbol_file_addr = next_func_start_entry->addr;
// Be sure the clear the Thumb address bit when we calculate the
// size from the current and next address
if (is_arm)
next_symbol_file_addr &= THUMB_ADDRESS_BIT_MASK;
symbol_byte_size = std::min<lldb::addr_t>(
next_symbol_file_addr - symbol_file_addr,
section_end_file_addr - symbol_file_addr);
} else {
symbol_byte_size = section_end_file_addr - symbol_file_addr;
}
}
}
symbol_value -= section_file_addr;
}

Expand Down Expand Up @@ -4501,9 +4459,6 @@ void ObjectFileMachO::ParseSymtab(Symtab &symtab) {
if (nlist.n_desc & N_WEAK_REF)
sym[sym_idx].SetIsWeak(true);

if (symbol_byte_size > 0)
sym[sym_idx].SetByteSize(symbol_byte_size);

if (demangled_is_synthesized)
sym[sym_idx].SetDemangledNameIsSynthesized(true);

Expand Down Expand Up @@ -4622,23 +4577,7 @@ void ObjectFileMachO::ParseSymtab(Symtab &symtab) {
Address symbol_addr;
if (module_sp->ResolveFileAddress(symbol_file_addr, symbol_addr)) {
SectionSP symbol_section(symbol_addr.GetSection());
uint32_t symbol_byte_size = 0;
if (symbol_section) {
const addr_t section_file_addr = symbol_section->GetFileAddress();
const FunctionStarts::Entry *next_func_start_entry =
function_starts.FindNextEntry(func_start_entry);
const addr_t section_end_file_addr =
section_file_addr + symbol_section->GetByteSize();
if (next_func_start_entry) {
addr_t next_symbol_file_addr = next_func_start_entry->addr;
if (is_arm)
next_symbol_file_addr &= THUMB_ADDRESS_BIT_MASK;
symbol_byte_size = std::min<lldb::addr_t>(
next_symbol_file_addr - symbol_file_addr,
section_end_file_addr - symbol_file_addr);
} else {
symbol_byte_size = section_end_file_addr - symbol_file_addr;
}
sym[sym_idx].SetID(synthetic_sym_id++);
// Don't set the name for any synthetic symbols, the Symbol
// object will generate one if needed when the name is accessed
Expand All @@ -4650,8 +4589,6 @@ void ObjectFileMachO::ParseSymtab(Symtab &symtab) {
add_symbol_addr(symbol_addr.GetFileAddress());
if (symbol_flags)
sym[sym_idx].SetFlags(symbol_flags);
if (symbol_byte_size)
sym[sym_idx].SetByteSize(symbol_byte_size);
++sym_idx;
}
}
Expand Down
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