JDevlieghere created this revision.
JDevlieghere added reviewers: clayborg, jasonmolenda, labath, aprantl, friss.
Herald added a subscriber: abidh.
Herald added a project: LLDB.
The symtab parser in ObjectFileMachO has logic to coalesce debug (STAB) and
non-debug symbols, based on the address and the symbol name, for static (STSYM)
and global symbols (GSYM) respectively. It makes the assumption that the debug
variant is always encountered first. Rather than creating a second entry in the
symbol table for the non-debug symbol, the non-debug symbol gets merged into
the existing debug symbol.
This breaks when the linker emits the non-debug symbol first. We'd end up with
two entries in the symbol table, each containing part of the information LLDB
relies on. Indeed, commenting out the merging logic breaks the test suite
spectacularly.
This patch solves that problem by always parsing the debug symbols first. This
guarantees that the assumption for merging holds.
PS: I'm not particularly proud of the way this turned out, but after numerous
attempts this is the best solution I could come up with. The symtab parsing
logic is pretty complex in that it touches a lot of things. I've experienced
first hand that it's very easy to break things. I believe this approach strikes
a balance between fixing the issue while limiting the risk of regressions.
Repository:
rLLDB LLDB
https://reviews.llvm.org/D68536
Files:
lldb/lit/ObjectFile/Inputs/SymbolTable.yaml
lldb/lit/ObjectFile/TestSymbolTable.test
lldb/source/Plugins/ObjectFile/Mach-O/ObjectFileMachO.cpp
Index: lldb/source/Plugins/ObjectFile/Mach-O/ObjectFileMachO.cpp
===================================================================
--- lldb/source/Plugins/ObjectFile/Mach-O/ObjectFileMachO.cpp
+++ lldb/source/Plugins/ObjectFile/Mach-O/ObjectFileMachO.cpp
@@ -2038,19 +2038,22 @@
return dsc_uuid;
}
-static bool ParseNList(DataExtractor &nlist_data,
- lldb::offset_t &nlist_data_offset,
- size_t nlist_byte_size, struct nlist_64 &nlist) {
+static llvm::Optional<struct nlist_64>
+ParseNList(DataExtractor &nlist_data, lldb::offset_t &nlist_data_offset,
+ size_t nlist_byte_size) {
+ struct nlist_64 nlist;
if (!nlist_data.ValidOffsetForDataOfSize(nlist_data_offset, nlist_byte_size))
- return false;
+ return {};
nlist.n_strx = nlist_data.GetU32_unchecked(&nlist_data_offset);
nlist.n_type = nlist_data.GetU8_unchecked(&nlist_data_offset);
nlist.n_sect = nlist_data.GetU8_unchecked(&nlist_data_offset);
nlist.n_desc = nlist_data.GetU16_unchecked(&nlist_data_offset);
nlist.n_value = nlist_data.GetAddress_unchecked(&nlist_data_offset);
- return true;
+ return nlist;
}
+enum { DebugSymbols = true, NonDebugSymbols = false };
+
size_t ObjectFileMachO::ParseSymtab() {
static Timer::Category func_cat(LLVM_PRETTY_FUNCTION);
Timer scoped_timer(func_cat, "ObjectFileMachO::ParseSymtab () module = %s",
@@ -3680,10 +3683,18 @@
typedef std::map<uint32_t, ConstString> SymbolIndexToName;
UndefinedNameToDescMap undefined_name_to_desc;
SymbolIndexToName reexport_shlib_needs_fixup;
- for (; nlist_idx < symtab_load_command.nsyms; ++nlist_idx) {
- struct nlist_64 nlist;
- if (!ParseNList(nlist_data, nlist_data_offset, nlist_byte_size, nlist))
- break;
+
+ // Symtab parsing is a huge mess. Everything is entangled and the code
+ // requires access to a ridiculous amount of variables. LLDB depends
+ // heavily on the proper merging of symbols and to get that right we need
+ // to make sure we have parsed all the debug symbols first. Therefore we
+ // invoke the lambda twice, once to parse only the debug symbols and then
+ // once more to parse the remaining symbols.
+ auto ParseSymbolLambda = [&](struct nlist_64 &nlist, uint32_t nlist_idx,
+ bool debug_only) {
+ const bool is_debug = ((nlist.n_type & N_STAB) != 0);
+ if (is_debug != debug_only)
+ return true;
const char *symbol_name_non_abi_mangled = nullptr;
const char *symbol_name = nullptr;
@@ -3699,7 +3710,7 @@
"0x%x in %s, ignoring symbol\n",
nlist_idx, nlist.n_strx,
module_sp->GetFileSpec().GetPath().c_str());
- continue;
+ return true;
}
if (symbol_name[0] == '\0')
symbol_name = nullptr;
@@ -3719,7 +3730,6 @@
bool demangled_is_synthesized = false;
bool set_value = true;
- const bool is_debug = ((nlist.n_type & N_STAB) != 0);
assert(sym_idx < num_syms);
sym[sym_idx].SetDebug(is_debug);
@@ -4270,7 +4280,7 @@
if (!add_nlist) {
sym[sym_idx].Clear();
- continue;
+ return true;
}
uint64_t symbol_value = nlist.n_value;
@@ -4361,7 +4371,6 @@
range;
range = N_FUN_addr_to_sym_idx.equal_range(nlist.n_value);
if (range.first != range.second) {
- bool found_it = false;
for (ValueToSymbolIndexMap::const_iterator pos = range.first;
pos != range.second; ++pos) {
if (sym[sym_idx].GetMangled().GetName(lldb::eLanguageTypeUnknown,
@@ -4378,12 +4387,9 @@
resolver_addresses.end())
sym[pos->second].SetType(eSymbolTypeResolver);
sym[sym_idx].Clear();
- found_it = true;
- break;
+ return true;
}
}
- if (found_it)
- continue;
} else {
if (resolver_addresses.find(nlist.n_value) !=
resolver_addresses.end())
@@ -4401,7 +4407,6 @@
range;
range = N_STSYM_addr_to_sym_idx.equal_range(nlist.n_value);
if (range.first != range.second) {
- bool found_it = false;
for (ValueToSymbolIndexMap::const_iterator pos = range.first;
pos != range.second; ++pos) {
if (sym[sym_idx].GetMangled().GetName(lldb::eLanguageTypeUnknown,
@@ -4415,12 +4420,9 @@
sym[pos->second].SetExternal(sym[sym_idx].IsExternal());
sym[pos->second].SetFlags(nlist.n_type << 16 | nlist.n_desc);
sym[sym_idx].Clear();
- found_it = true;
- break;
+ return true;
}
}
- if (found_it)
- continue;
} else {
// Combine N_GSYM stab entries with the non stab symbol.
const char *gsym_name = sym[sym_idx]
@@ -4443,7 +4445,7 @@
// the symbol table.
sym[GSYM_sym_idx].SetFlags(nlist.n_type << 16 | nlist.n_desc);
sym[sym_idx].Clear();
- continue;
+ return true;
}
}
}
@@ -4467,6 +4469,35 @@
sym[sym_idx].SetDemangledNameIsSynthesized(true);
++sym_idx;
+ return true;
+ };
+
+ // First parse all the nlists but don't process them yet. See the next
+ // comment for an explanation why.
+ std::vector<struct nlist_64> nlists;
+ for (; nlist_idx < symtab_load_command.nsyms; ++nlist_idx) {
+ if (auto nlist =
+ ParseNList(nlist_data, nlist_data_offset, nlist_byte_size))
+ nlists.push_back(*nlist);
+ else
+ break;
+ }
+
+ // Now parse all the debug symbols. This is needed to merge non-debug
+ // symbols in the next step. Non-debug symbols are always coalesced into
+ // the debug symbol. Doing this in one step would mean that some symbols
+ // won't be merged.
+ nlist_idx = 0;
+ for (auto &nlist : nlists) {
+ if (!ParseSymnbolLambda(nlist, nlist_idx++, DebugSymbols))
+ break;
+ }
+
+ // Finally parse all the non debug symbols.
+ nlist_idx = 0;
+ for (auto &nlist : nlists) {
+ if (!ParseSymnbolLambda(nlist, nlist_idx++, NonDebugSymbols))
+ break;
}
for (const auto &pos : reexport_shlib_needs_fixup) {
Index: lldb/lit/ObjectFile/TestSymbolTable.test
===================================================================
--- /dev/null
+++ lldb/lit/ObjectFile/TestSymbolTable.test
@@ -0,0 +1,11 @@
+# REQUIRES: system-darwin
+
+# Tests that the symbol table properly merges the two entries for
+# global_constant, even when the debug symbol comes last.
+
+# RUN: mkdir -p %t
+# RUN: yaml2obj %S/Inputs/SymbolTable.yaml -o %t/a.out
+# RUN: %lldb %t/a.out -o "target modules dump symtab a.out" | FileCheck %s
+
+# CHECK: global_constant
+# CHECK-NOT: global_constant
Index: lldb/lit/ObjectFile/Inputs/SymbolTable.yaml
===================================================================
--- /dev/null
+++ lldb/lit/ObjectFile/Inputs/SymbolTable.yaml
@@ -0,0 +1,692 @@
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+ StringTable:
+ - ' '
+ - __mh_execute_header
+ - _main
+ - _swift_beginAccess
+ - _swift_endAccess
+ - _swift_getTypeByMangledNameInContext
+ - dyld_stub_binder
+ - '_$s1a3useyyxlF'
+ - '_$s1a1fyySi_SiztF'
+ - ___swift_instantiateConcreteTypeFromMangledName
+ - _symbolic Si_Sit
+ - ___swift_reflection_version
+ - __dyld_private
+ - '_$sSi_SitMD'
+ - '_$s1a15global_constantSivp'
+ - '_$s1a15global_variableSivp'
+ - '/Volumes/Jonas/internal-stable/build/Ninja-RelWithDebInfoAssert+stdlib-RelWithDebInfo/lldb-macosx-x86_64/lldb-test-build.noindex/lang/swift/variables/let/TestSwiftLetConstants.test_let_constants_dwarf/a.swiftmodule'
+ - '/Volumes/Jonas/internal-stable/lldb/packages/Python/lldbsuite/test/lang/swift/variables/let/'
+ - main.swift
+ - '/Volumes/Jonas/internal-stable/build/Ninja-RelWithDebInfoAssert+stdlib-RelWithDebInfo/lldb-macosx-x86_64/lldb-test-build.noindex/lang/swift/variables/let/TestSwiftLetConstants.test_let_constants_dwarf/main.o'
+ - _main
+ - '_$s1a3useyyxlF'
+ - '_$s1a1fyySi_SiztF'
+ - ___swift_instantiateConcreteTypeFromMangledName
+ - _symbolic Si_Sit
+ - ___swift_reflection_version
+ - '_$sSi_SitMD'
+ - '_$s1a15global_constantSivp'
+ - '_$s1a15global_variableSivp'
+ - ''
+ - ''
+ - ''
+ - ''
+ - ''
+ - ''
+...
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