JDevlieghere updated this revision to Diff 167248.
JDevlieghere added a comment.
- Add assertions per Greg's suggestion.
https://reviews.llvm.org/D52543
Files:
include/lldb/Symbol/SymbolFile.h
source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
source/Symbol/SymbolFile.cpp
Index: source/Symbol/SymbolFile.cpp
===================================================================
--- source/Symbol/SymbolFile.cpp
+++ source/Symbol/SymbolFile.cpp
@@ -19,6 +19,8 @@
#include "lldb/Utility/StreamString.h"
#include "lldb/lldb-private.h"
+#include <future>
+
using namespace lldb_private;
void SymbolFile::PreloadSymbols() {
@@ -150,3 +152,16 @@
types.Clear();
return 0;
}
+
+void SymbolFile::AssertModuleLock() {
+ // We assert that we have to module lock by trying to acquire the lock from a
+ // different thread. Note that we must abort if the result is true to
+ // guarantee correctness.
+ assert(std::async(
+ std::launch::async,
+ [this] {
+ return this->GetObjectFile()->GetModule()->GetMutex().try_lock();
+ })
+ .get() == false &&
+ "Module is not locked");
+}
Index: source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
===================================================================
--- source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
+++ source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
@@ -262,6 +262,7 @@
}
TypeList *SymbolFileDWARF::GetTypeList() {
+ AssertModuleLock();
SymbolFileDWARFDebugMap *debug_map_symfile = GetDebugMapSymfile();
if (debug_map_symfile)
return debug_map_symfile->GetTypeList();
@@ -343,6 +344,7 @@
uint32_t type_mask, TypeList &type_list)
{
+ AssertModuleLock();
TypeSet type_set;
CompileUnit *comp_unit = NULL;
@@ -854,6 +856,7 @@
}
CompUnitSP SymbolFileDWARF::ParseCompileUnitAtIndex(uint32_t cu_idx) {
+ AssertModuleLock();
CompUnitSP cu_sp;
DWARFDebugInfo *info = DebugInfo();
if (info) {
@@ -866,6 +869,7 @@
Function *SymbolFileDWARF::ParseCompileUnitFunction(const SymbolContext &sc,
const DWARFDIE &die) {
+ AssertModuleLock();
if (die.IsValid()) {
TypeSystem *type_system =
GetTypeSystemForLanguage(die.GetCU()->GetLanguageType());
@@ -889,6 +893,7 @@
}
lldb::LanguageType
SymbolFileDWARF::ParseCompileUnitLanguage(const SymbolContext &sc) {
+ AssertModuleLock();
assert(sc.comp_unit);
DWARFUnit *dwarf_cu = GetDWARFCompileUnit(sc.comp_unit);
if (dwarf_cu)
@@ -898,6 +903,7 @@
}
size_t SymbolFileDWARF::ParseCompileUnitFunctions(const SymbolContext &sc) {
+ AssertModuleLock();
assert(sc.comp_unit);
size_t functions_added = 0;
DWARFUnit *dwarf_cu = GetDWARFCompileUnit(sc.comp_unit);
@@ -920,6 +926,7 @@
bool SymbolFileDWARF::ParseCompileUnitSupportFiles(
const SymbolContext &sc, FileSpecList &support_files) {
+ AssertModuleLock();
assert(sc.comp_unit);
DWARFUnit *dwarf_cu = GetDWARFCompileUnit(sc.comp_unit);
if (dwarf_cu) {
@@ -945,6 +952,7 @@
bool SymbolFileDWARF::ParseCompileUnitIsOptimized(
const lldb_private::SymbolContext &sc) {
+ AssertModuleLock();
DWARFUnit *dwarf_cu = GetDWARFCompileUnit(sc.comp_unit);
if (dwarf_cu)
return dwarf_cu->GetIsOptimized();
@@ -954,6 +962,7 @@
bool SymbolFileDWARF::ParseImportedModules(
const lldb_private::SymbolContext &sc,
std::vector<lldb_private::ConstString> &imported_modules) {
+ AssertModuleLock();
assert(sc.comp_unit);
DWARFUnit *dwarf_cu = GetDWARFCompileUnit(sc.comp_unit);
if (dwarf_cu) {
@@ -1031,6 +1040,7 @@
}
bool SymbolFileDWARF::ParseCompileUnitLineTable(const SymbolContext &sc) {
+ AssertModuleLock();
assert(sc.comp_unit);
if (sc.comp_unit->GetLineTable() != NULL)
return true;
@@ -1116,6 +1126,7 @@
}
bool SymbolFileDWARF::ParseCompileUnitDebugMacros(const SymbolContext &sc) {
+ AssertModuleLock();
assert(sc.comp_unit);
DWARFUnit *dwarf_cu = GetDWARFCompileUnit(sc.comp_unit);
@@ -1295,6 +1306,8 @@
}
SymbolFileDWARF *SymbolFileDWARF::GetDWARFForUID(lldb::user_id_t uid) {
+ std::lock_guard<std::recursive_mutex> guard(
+ GetObjectFile()->GetModule()->GetMutex());
// Anytime we get a "lldb::user_id_t" from an lldb_private::SymbolFile API we
// must make sure we use the correct DWARF file when resolving things. On
// MacOSX, when using SymbolFileDWARFDebugMap, we will use multiple
@@ -1311,6 +1324,8 @@
DWARFDIE
SymbolFileDWARF::GetDIEFromUID(lldb::user_id_t uid) {
+ std::lock_guard<std::recursive_mutex> guard(
+ GetObjectFile()->GetModule()->GetMutex());
// Anytime we get a "lldb::user_id_t" from an lldb_private::SymbolFile API we
// must make sure we use the correct DWARF file when resolving things. On
// MacOSX, when using SymbolFileDWARFDebugMap, we will use multiple
@@ -1325,6 +1340,8 @@
}
CompilerDecl SymbolFileDWARF::GetDeclForUID(lldb::user_id_t type_uid) {
+ std::lock_guard<std::recursive_mutex> guard(
+ GetObjectFile()->GetModule()->GetMutex());
// Anytime we have a lldb::user_id_t, we must get the DIE by calling
// SymbolFileDWARF::GetDIEFromUID(). See comments inside the
// SymbolFileDWARF::GetDIEFromUID() for details.
@@ -1336,6 +1353,8 @@
CompilerDeclContext
SymbolFileDWARF::GetDeclContextForUID(lldb::user_id_t type_uid) {
+ std::lock_guard<std::recursive_mutex> guard(
+ GetObjectFile()->GetModule()->GetMutex());
// Anytime we have a lldb::user_id_t, we must get the DIE by calling
// SymbolFileDWARF::GetDIEFromUID(). See comments inside the
// SymbolFileDWARF::GetDIEFromUID() for details.
@@ -1347,6 +1366,8 @@
CompilerDeclContext
SymbolFileDWARF::GetDeclContextContainingUID(lldb::user_id_t type_uid) {
+ std::lock_guard<std::recursive_mutex> guard(
+ GetObjectFile()->GetModule()->GetMutex());
// Anytime we have a lldb::user_id_t, we must get the DIE by calling
// SymbolFileDWARF::GetDIEFromUID(). See comments inside the
// SymbolFileDWARF::GetDIEFromUID() for details.
@@ -1357,6 +1378,8 @@
}
Type *SymbolFileDWARF::ResolveTypeUID(lldb::user_id_t type_uid) {
+ std::lock_guard<std::recursive_mutex> guard(
+ GetObjectFile()->GetModule()->GetMutex());
// Anytime we have a lldb::user_id_t, we must get the DIE by calling
// SymbolFileDWARF::GetDIEFromUID(). See comments inside the
// SymbolFileDWARF::GetDIEFromUID() for details.
@@ -3069,6 +3092,7 @@
}
size_t SymbolFileDWARF::ParseFunctionBlocks(const SymbolContext &sc) {
+ AssertModuleLock();
assert(sc.comp_unit && sc.function);
size_t functions_added = 0;
DWARFUnit *dwarf_cu = GetDWARFCompileUnit(sc.comp_unit);
@@ -3085,6 +3109,7 @@
}
size_t SymbolFileDWARF::ParseTypes(const SymbolContext &sc) {
+ AssertModuleLock();
// At least a compile unit must be valid
assert(sc.comp_unit);
size_t types_added = 0;
@@ -3108,6 +3133,7 @@
}
size_t SymbolFileDWARF::ParseVariablesForContext(const SymbolContext &sc) {
+ AssertModuleLock();
if (sc.comp_unit != NULL) {
DWARFDebugInfo *info = DebugInfo();
if (info == NULL)
Index: include/lldb/Symbol/SymbolFile.h
===================================================================
--- include/lldb/Symbol/SymbolFile.h
+++ include/lldb/Symbol/SymbolFile.h
@@ -203,6 +203,8 @@
virtual void Dump(Stream &s) {}
protected:
+ void AssertModuleLock();
+
ObjectFile *m_obj_file; // The object file that symbols can be extracted from.
uint32_t m_abilities;
bool m_calculated_abilities;
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