6a83143650
This patch adds ThreadSanitizer support into LLDB: - Adding a new InstrumentationRuntime plugin, ThreadSanitizerRuntime, in the same way ASan is implemented. - A breakpoint stops in `__tsan_on_report`, then we extract all sorts of information by evaluating an expression. We then populate this into StopReasonExtendedInfo. - SBThread gets a new API, SBThread::GetStopReasonExtendedBacktraces(), which returns TSan’s backtraces in the form of regular SBThreads. Non-TSan stop reasons return an empty collection. - Added some test cases. Reviewed by Greg Clayton. llvm-svn: 264162
539 lines
21 KiB
C++
539 lines
21 KiB
C++
//===-- ThreadSanitizerRuntime.cpp ------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "ThreadSanitizerRuntime.h"
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#include "lldb/Breakpoint/StoppointCallbackContext.h"
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#include "lldb/Core/Debugger.h"
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#include "lldb/Core/Module.h"
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#include "lldb/Core/ModuleList.h"
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#include "lldb/Core/RegularExpression.h"
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#include "lldb/Core/PluginInterface.h"
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#include "lldb/Core/PluginManager.h"
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#include "lldb/Core/Stream.h"
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#include "lldb/Core/StreamFile.h"
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#include "lldb/Core/ValueObject.h"
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#include "lldb/Expression/UserExpression.h"
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#include "lldb/Interpreter/CommandReturnObject.h"
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#include "lldb/Symbol/Symbol.h"
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#include "lldb/Symbol/SymbolContext.h"
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#include "lldb/Target/InstrumentationRuntimeStopInfo.h"
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#include "lldb/Target/StopInfo.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Target/Thread.h"
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using namespace lldb;
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using namespace lldb_private;
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lldb::InstrumentationRuntimeSP
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ThreadSanitizerRuntime::CreateInstance (const lldb::ProcessSP &process_sp)
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{
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return InstrumentationRuntimeSP(new ThreadSanitizerRuntime(process_sp));
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}
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void
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ThreadSanitizerRuntime::Initialize()
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{
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PluginManager::RegisterPlugin (GetPluginNameStatic(),
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"ThreadSanitizer instrumentation runtime plugin.",
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CreateInstance,
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GetTypeStatic);
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}
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void
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ThreadSanitizerRuntime::Terminate()
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{
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PluginManager::UnregisterPlugin (CreateInstance);
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}
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lldb_private::ConstString
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ThreadSanitizerRuntime::GetPluginNameStatic()
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{
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return ConstString("ThreadSanitizer");
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}
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lldb::InstrumentationRuntimeType
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ThreadSanitizerRuntime::GetTypeStatic()
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{
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return eInstrumentationRuntimeTypeThreadSanitizer;
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}
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ThreadSanitizerRuntime::ThreadSanitizerRuntime(const ProcessSP &process_sp) :
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m_is_active(false),
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m_runtime_module_wp(),
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m_process_wp(),
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m_breakpoint_id(0)
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{
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if (process_sp)
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m_process_wp = process_sp;
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}
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ThreadSanitizerRuntime::~ThreadSanitizerRuntime()
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{
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Deactivate();
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}
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static bool
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ModuleContainsTSanRuntime(ModuleSP module_sp)
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{
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static ConstString g_tsan_get_current_report("__tsan_get_current_report");
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const Symbol* symbol = module_sp->FindFirstSymbolWithNameAndType(g_tsan_get_current_report, lldb::eSymbolTypeAny);
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return symbol != nullptr;
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}
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void
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ThreadSanitizerRuntime::ModulesDidLoad(lldb_private::ModuleList &module_list)
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{
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if (IsActive())
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return;
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if (GetRuntimeModuleSP()) {
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Activate();
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return;
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}
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module_list.ForEach ([this](const lldb::ModuleSP module_sp) -> bool
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{
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const FileSpec & file_spec = module_sp->GetFileSpec();
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if (! file_spec)
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return true; // Keep iterating through modules
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llvm::StringRef module_basename(file_spec.GetFilename().GetStringRef());
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if (module_sp->IsExecutable() || module_basename.startswith("libclang_rt.tsan_"))
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{
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if (ModuleContainsTSanRuntime(module_sp))
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{
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m_runtime_module_wp = module_sp;
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Activate();
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return false; // Stop iterating
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}
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}
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return true; // Keep iterating through modules
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});
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}
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bool
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ThreadSanitizerRuntime::IsActive()
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{
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return m_is_active;
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}
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#define RETRIEVE_REPORT_DATA_FUNCTION_TIMEOUT_USEC 2*1000*1000
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const char *
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thread_sanitizer_retrieve_report_data_prefix = R"(
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extern "C"
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{
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void *__tsan_get_current_report();
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int __tsan_get_report_data(void *report, const char **description, int *count,
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int *stack_count, int *mop_count, int *loc_count,
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int *mutex_count, int *thread_count,
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int *unique_tid_count, void **sleep_trace,
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unsigned long trace_size);
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int __tsan_get_report_stack(void *report, unsigned long idx, void **trace,
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unsigned long trace_size);
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int __tsan_get_report_mop(void *report, unsigned long idx, int *tid, void **addr,
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int *size, int *write, int *atomic, void **trace,
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unsigned long trace_size);
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int __tsan_get_report_loc(void *report, unsigned long idx, const char **type,
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void **addr, unsigned long *start, unsigned long *size, int *tid,
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int *fd, int *suppressable, void **trace,
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unsigned long trace_size);
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int __tsan_get_report_mutex(void *report, unsigned long idx, unsigned long *mutex_id, void **addr,
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int *destroyed, void **trace, unsigned long trace_size);
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int __tsan_get_report_thread(void *report, unsigned long idx, int *tid, unsigned long *pid,
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int *running, const char **name, int *parent_tid,
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void **trace, unsigned long trace_size);
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int __tsan_get_report_unique_tid(void *report, unsigned long idx, int *tid);
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}
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const int REPORT_TRACE_SIZE = 128;
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const int REPORT_ARRAY_SIZE = 4;
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struct data {
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void *report;
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const char *description;
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int report_count;
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void *sleep_trace[REPORT_TRACE_SIZE];
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int stack_count;
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struct {
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int idx;
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void *trace[REPORT_TRACE_SIZE];
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} stacks[REPORT_ARRAY_SIZE];
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int mop_count;
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struct {
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int idx;
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int tid;
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int size;
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int write;
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int atomic;
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void *addr;
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void *trace[REPORT_TRACE_SIZE];
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} mops[REPORT_ARRAY_SIZE];
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int loc_count;
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struct {
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int idx;
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const char *type;
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void *addr;
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unsigned long start;
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unsigned long size;
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int tid;
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int fd;
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int suppressable;
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void *trace[REPORT_TRACE_SIZE];
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} locs[REPORT_ARRAY_SIZE];
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int mutex_count;
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struct {
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int idx;
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unsigned long mutex_id;
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void *addr;
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int destroyed;
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void *trace[REPORT_TRACE_SIZE];
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} mutexes[REPORT_ARRAY_SIZE];
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int thread_count;
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struct {
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int idx;
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int tid;
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unsigned long pid;
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int running;
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const char *name;
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int parent_tid;
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void *trace[REPORT_TRACE_SIZE];
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} threads[REPORT_ARRAY_SIZE];
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int unique_tid_count;
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struct {
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int idx;
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int tid;
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} unique_tids[REPORT_ARRAY_SIZE];
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};
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)";
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const char *
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thread_sanitizer_retrieve_report_data_command = R"(
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data t = {0};
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t.report = __tsan_get_current_report();
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__tsan_get_report_data(t.report, &t.description, &t.report_count, &t.stack_count, &t.mop_count, &t.loc_count, &t.mutex_count, &t.thread_count, &t.unique_tid_count, t.sleep_trace, REPORT_TRACE_SIZE);
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if (t.stack_count > REPORT_ARRAY_SIZE) t.stack_count = REPORT_ARRAY_SIZE;
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for (int i = 0; i < t.stack_count; i++) {
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t.stacks[i].idx = i;
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__tsan_get_report_stack(t.report, i, t.stacks[i].trace, REPORT_TRACE_SIZE);
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}
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if (t.mop_count > REPORT_ARRAY_SIZE) t.mop_count = REPORT_ARRAY_SIZE;
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for (int i = 0; i < t.mop_count; i++) {
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t.mops[i].idx = i;
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__tsan_get_report_mop(t.report, i, &t.mops[i].tid, &t.mops[i].addr, &t.mops[i].size, &t.mops[i].write, &t.mops[i].atomic, t.mops[i].trace, REPORT_TRACE_SIZE);
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}
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if (t.loc_count > REPORT_ARRAY_SIZE) t.loc_count = REPORT_ARRAY_SIZE;
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for (int i = 0; i < t.loc_count; i++) {
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t.locs[i].idx = i;
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__tsan_get_report_loc(t.report, i, &t.locs[i].type, &t.locs[i].addr, &t.locs[i].start, &t.locs[i].size, &t.locs[i].tid, &t.locs[i].fd, &t.locs[i].suppressable, t.locs[i].trace, REPORT_TRACE_SIZE);
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}
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if (t.mutex_count > REPORT_ARRAY_SIZE) t.mutex_count = REPORT_ARRAY_SIZE;
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for (int i = 0; i < t.mutex_count; i++) {
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t.mutexes[i].idx = i;
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__tsan_get_report_mutex(t.report, i, &t.mutexes[i].mutex_id, &t.mutexes[i].addr, &t.mutexes[i].destroyed, t.mutexes[i].trace, REPORT_TRACE_SIZE);
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}
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if (t.thread_count > REPORT_ARRAY_SIZE) t.thread_count = REPORT_ARRAY_SIZE;
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for (int i = 0; i < t.thread_count; i++) {
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t.threads[i].idx = i;
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__tsan_get_report_thread(t.report, i, &t.threads[i].tid, &t.threads[i].pid, &t.threads[i].running, &t.threads[i].name, &t.threads[i].parent_tid, t.threads[i].trace, REPORT_TRACE_SIZE);
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}
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if (t.unique_tid_count > REPORT_ARRAY_SIZE) t.unique_tid_count = REPORT_ARRAY_SIZE;
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for (int i = 0; i < t.unique_tid_count; i++) {
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t.unique_tids[i].idx = i;
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__tsan_get_report_unique_tid(t.report, i, &t.unique_tids[i].tid);
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}
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t;
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)";
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static StructuredData::Array *
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CreateStackTrace(ValueObjectSP o, std::string trace_item_name = ".trace") {
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StructuredData::Array *trace = new StructuredData::Array();
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ValueObjectSP trace_value_object = o->GetValueForExpressionPath(trace_item_name.c_str());
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for (int j = 0; j < 8; j++) {
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addr_t trace_addr = trace_value_object->GetChildAtIndex(j, true)->GetValueAsUnsigned(0);
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if (trace_addr == 0)
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break;
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trace->AddItem(StructuredData::ObjectSP(new StructuredData::Integer(trace_addr)));
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}
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return trace;
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}
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static StructuredData::Array *
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ConvertToStructuredArray(ValueObjectSP return_value_sp, std::string items_name, std::string count_name, std::function <void(ValueObjectSP o, StructuredData::Dictionary *dict)> const &callback)
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{
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StructuredData::Array *array = new StructuredData::Array();
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unsigned int count = return_value_sp->GetValueForExpressionPath(count_name.c_str())->GetValueAsUnsigned(0);
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ValueObjectSP objects = return_value_sp->GetValueForExpressionPath(items_name.c_str());
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for (int i = 0; i < count; i++) {
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ValueObjectSP o = objects->GetChildAtIndex(i, true);
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StructuredData::Dictionary *dict = new StructuredData::Dictionary();
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callback(o, dict);
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array->AddItem(StructuredData::ObjectSP(dict));
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}
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return array;
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}
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static std::string
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RetrieveString(ValueObjectSP return_value_sp, ProcessSP process_sp, std::string expression_path)
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{
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addr_t ptr = return_value_sp->GetValueForExpressionPath(expression_path.c_str())->GetValueAsUnsigned(0);
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std::string str;
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Error error;
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process_sp->ReadCStringFromMemory(ptr, str, error);
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return str;
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}
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StructuredData::ObjectSP
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ThreadSanitizerRuntime::RetrieveReportData(ExecutionContextRef exe_ctx_ref)
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{
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ProcessSP process_sp = GetProcessSP();
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if (!process_sp)
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return StructuredData::ObjectSP();
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ThreadSP thread_sp = exe_ctx_ref.GetThreadSP();
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StackFrameSP frame_sp = thread_sp->GetSelectedFrame();
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if (!frame_sp)
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return StructuredData::ObjectSP();
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EvaluateExpressionOptions options;
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options.SetUnwindOnError(true);
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options.SetTryAllThreads(true);
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options.SetStopOthers(true);
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options.SetIgnoreBreakpoints(true);
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options.SetTimeoutUsec(RETRIEVE_REPORT_DATA_FUNCTION_TIMEOUT_USEC);
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options.SetPrefix(thread_sanitizer_retrieve_report_data_prefix);
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ValueObjectSP main_value;
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ExecutionContext exe_ctx;
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Error eval_error;
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frame_sp->CalculateExecutionContext(exe_ctx);
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ExpressionResults result = UserExpression::Evaluate (exe_ctx,
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options,
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thread_sanitizer_retrieve_report_data_command,
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"",
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main_value,
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eval_error);
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if (result != eExpressionCompleted) {
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process_sp->GetTarget().GetDebugger().GetAsyncOutputStream()->Printf("Warning: Cannot evaluate ThreadSanitizer expression:\n%s\n", eval_error.AsCString());
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return StructuredData::ObjectSP();
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}
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StructuredData::Dictionary *dict = new StructuredData::Dictionary();
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dict->AddStringItem("instrumentation_class", "ThreadSanitizer");
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dict->AddStringItem("description", RetrieveString(main_value, process_sp, ".description"));
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dict->AddIntegerItem("report_count", main_value->GetValueForExpressionPath(".report_count")->GetValueAsUnsigned(0));
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dict->AddItem("sleep_trace", StructuredData::ObjectSP(CreateStackTrace(main_value, ".sleep_trace")));
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StructuredData::Array *stacks = ConvertToStructuredArray(main_value, ".stacks", ".stack_count", [] (ValueObjectSP o, StructuredData::Dictionary *dict) {
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dict->AddIntegerItem("index", o->GetValueForExpressionPath(".idx")->GetValueAsUnsigned(0));
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dict->AddItem("trace", StructuredData::ObjectSP(CreateStackTrace(o)));
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});
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dict->AddItem("stacks", StructuredData::ObjectSP(stacks));
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StructuredData::Array *mops = ConvertToStructuredArray(main_value, ".mops", ".mop_count", [] (ValueObjectSP o, StructuredData::Dictionary *dict) {
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dict->AddIntegerItem("index", o->GetValueForExpressionPath(".idx")->GetValueAsUnsigned(0));
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dict->AddIntegerItem("thread_id", o->GetValueForExpressionPath(".tid")->GetValueAsUnsigned(0));
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dict->AddIntegerItem("size", o->GetValueForExpressionPath(".size")->GetValueAsUnsigned(0));
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dict->AddBooleanItem("is_write", o->GetValueForExpressionPath(".write")->GetValueAsUnsigned(0));
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dict->AddBooleanItem("is_atomic", o->GetValueForExpressionPath(".atomic")->GetValueAsUnsigned(0));
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dict->AddIntegerItem("address", o->GetValueForExpressionPath(".addr")->GetValueAsUnsigned(0));
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dict->AddItem("trace", StructuredData::ObjectSP(CreateStackTrace(o)));
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});
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dict->AddItem("mops", StructuredData::ObjectSP(mops));
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StructuredData::Array *locs = ConvertToStructuredArray(main_value, ".locs", ".loc_count", [process_sp] (ValueObjectSP o, StructuredData::Dictionary *dict) {
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dict->AddIntegerItem("index", o->GetValueForExpressionPath(".idx")->GetValueAsUnsigned(0));
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dict->AddStringItem("type", RetrieveString(o, process_sp, ".type"));
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dict->AddIntegerItem("address", o->GetValueForExpressionPath(".addr")->GetValueAsUnsigned(0));
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dict->AddIntegerItem("start", o->GetValueForExpressionPath(".start")->GetValueAsUnsigned(0));
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dict->AddIntegerItem("size", o->GetValueForExpressionPath(".size")->GetValueAsUnsigned(0));
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dict->AddIntegerItem("thread_id", o->GetValueForExpressionPath(".tid")->GetValueAsUnsigned(0));
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dict->AddIntegerItem("file_descriptor", o->GetValueForExpressionPath(".fd")->GetValueAsUnsigned(0));
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dict->AddIntegerItem("suppressable", o->GetValueForExpressionPath(".suppressable")->GetValueAsUnsigned(0));
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dict->AddItem("trace", StructuredData::ObjectSP(CreateStackTrace(o)));
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});
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dict->AddItem("locs", StructuredData::ObjectSP(locs));
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StructuredData::Array *mutexes = ConvertToStructuredArray(main_value, ".mutexes", ".mutex_count", [] (ValueObjectSP o, StructuredData::Dictionary *dict) {
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dict->AddIntegerItem("index", o->GetValueForExpressionPath(".idx")->GetValueAsUnsigned(0));
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dict->AddIntegerItem("mutex_id", o->GetValueForExpressionPath(".mutex_id")->GetValueAsUnsigned(0));
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dict->AddIntegerItem("address", o->GetValueForExpressionPath(".addr")->GetValueAsUnsigned(0));
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dict->AddIntegerItem("destroyed", o->GetValueForExpressionPath(".destroyed")->GetValueAsUnsigned(0));
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dict->AddItem("trace", StructuredData::ObjectSP(CreateStackTrace(o)));
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});
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dict->AddItem("mutexes", StructuredData::ObjectSP(mutexes));
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StructuredData::Array *threads = ConvertToStructuredArray(main_value, ".threads", ".thread_count", [process_sp] (ValueObjectSP o, StructuredData::Dictionary *dict) {
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dict->AddIntegerItem("index", o->GetValueForExpressionPath(".idx")->GetValueAsUnsigned(0));
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dict->AddIntegerItem("thread_id", o->GetValueForExpressionPath(".tid")->GetValueAsUnsigned(0));
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dict->AddIntegerItem("process_id", o->GetValueForExpressionPath(".pid")->GetValueAsUnsigned(0));
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dict->AddIntegerItem("running", o->GetValueForExpressionPath(".running")->GetValueAsUnsigned(0));
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dict->AddStringItem("name", RetrieveString(o, process_sp, ".name"));
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dict->AddIntegerItem("parent_thread_id", o->GetValueForExpressionPath(".parent_tid")->GetValueAsUnsigned(0));
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dict->AddItem("trace", StructuredData::ObjectSP(CreateStackTrace(o)));
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});
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dict->AddItem("threads", StructuredData::ObjectSP(threads));
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StructuredData::Array *unique_tids = ConvertToStructuredArray(main_value, ".unique_tids", ".unique_tid_count", [] (ValueObjectSP o, StructuredData::Dictionary *dict) {
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dict->AddIntegerItem("index", o->GetValueForExpressionPath(".idx")->GetValueAsUnsigned(0));
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dict->AddIntegerItem("tid", o->GetValueForExpressionPath(".tid")->GetValueAsUnsigned(0));
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});
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dict->AddItem("unique_tids", StructuredData::ObjectSP(unique_tids));
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return StructuredData::ObjectSP(dict);
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}
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std::string
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ThreadSanitizerRuntime::FormatDescription(StructuredData::ObjectSP report)
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{
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std::string description = report->GetAsDictionary()->GetValueForKey("description")->GetAsString()->GetValue();
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if (description == "data-race") {
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return "Data race detected";
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} else if (description == "data-race-vptr") {
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return "Data race on C++ virtual pointer detected";
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} else if (description == "heap-use-after-free") {
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return "Use of deallocated memory detected";
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} else if (description == "heap-use-after-free-vptr") {
|
||
return "Use of deallocated C++ virtual pointer detected";
|
||
} else if (description == "thread-leak") {
|
||
return "Thread leak detected";
|
||
} else if (description == "locked-mutex-destroy") {
|
||
return "Destruction of a locked mutex detected";
|
||
} else if (description == "mutex-double-lock") {
|
||
return "Double lock of a mutex detected";
|
||
} else if (description == "mutex-invalid-access") {
|
||
return "Use of an invalid mutex (e.g. uninitialized or destroyed) detected";
|
||
} else if (description == "mutex-bad-unlock") {
|
||
return "Unlock of an unlocked mutex (or by a wrong thread) detected";
|
||
} else if (description == "mutex-bad-read-lock") {
|
||
return "Read lock of a write locked mutex detected";
|
||
} else if (description == "mutex-bad-read-unlock") {
|
||
return "Read unlock of a write locked mutex detected";
|
||
} else if (description == "signal-unsafe-call") {
|
||
return "Signal-unsafe call inside a signal handler detected";
|
||
} else if (description == "errno-in-signal-handler") {
|
||
return "Overwrite of errno in a signal handler detected";
|
||
} else if (description == "lock-order-inversion") {
|
||
return "Lock order inversion (potential deadlock) detected";
|
||
}
|
||
|
||
// for unknown report codes just show the code
|
||
return description;
|
||
}
|
||
|
||
bool
|
||
ThreadSanitizerRuntime::NotifyBreakpointHit(void *baton, StoppointCallbackContext *context, user_id_t break_id, user_id_t break_loc_id)
|
||
{
|
||
assert (baton && "null baton");
|
||
if (!baton)
|
||
return false;
|
||
|
||
ThreadSanitizerRuntime *const instance = static_cast<ThreadSanitizerRuntime*>(baton);
|
||
|
||
StructuredData::ObjectSP report = instance->RetrieveReportData(context->exe_ctx_ref);
|
||
std::string description;
|
||
if (report) {
|
||
description = instance->FormatDescription(report);
|
||
}
|
||
ProcessSP process_sp = instance->GetProcessSP();
|
||
// Make sure this is the right process
|
||
if (process_sp && process_sp == context->exe_ctx_ref.GetProcessSP())
|
||
{
|
||
ThreadSP thread_sp = context->exe_ctx_ref.GetThreadSP();
|
||
if (thread_sp)
|
||
thread_sp->SetStopInfo(InstrumentationRuntimeStopInfo::CreateStopReasonWithInstrumentationData(*thread_sp, description.c_str(), report));
|
||
|
||
StreamFileSP stream_sp (process_sp->GetTarget().GetDebugger().GetOutputFile());
|
||
if (stream_sp)
|
||
{
|
||
stream_sp->Printf ("ThreadSanitizer report breakpoint hit. Use 'thread info -s' to get extended information about the report.\n");
|
||
}
|
||
return true; // Return true to stop the target
|
||
}
|
||
else
|
||
return false; // Let target run
|
||
}
|
||
|
||
void
|
||
ThreadSanitizerRuntime::Activate()
|
||
{
|
||
if (m_is_active)
|
||
return;
|
||
|
||
ProcessSP process_sp = GetProcessSP();
|
||
if (!process_sp)
|
||
return;
|
||
|
||
ConstString symbol_name ("__tsan_on_report");
|
||
const Symbol *symbol = GetRuntimeModuleSP()->FindFirstSymbolWithNameAndType (symbol_name, eSymbolTypeCode);
|
||
|
||
if (symbol == NULL)
|
||
return;
|
||
|
||
if (!symbol->ValueIsAddress() || !symbol->GetAddressRef().IsValid())
|
||
return;
|
||
|
||
Target &target = process_sp->GetTarget();
|
||
addr_t symbol_address = symbol->GetAddressRef().GetOpcodeLoadAddress(&target);
|
||
|
||
if (symbol_address == LLDB_INVALID_ADDRESS)
|
||
return;
|
||
|
||
bool internal = true;
|
||
bool hardware = false;
|
||
Breakpoint *breakpoint = process_sp->GetTarget().CreateBreakpoint(symbol_address, internal, hardware).get();
|
||
breakpoint->SetCallback (ThreadSanitizerRuntime::NotifyBreakpointHit, this, true);
|
||
breakpoint->SetBreakpointKind ("thread-sanitizer-report");
|
||
m_breakpoint_id = breakpoint->GetID();
|
||
|
||
StreamFileSP stream_sp (process_sp->GetTarget().GetDebugger().GetOutputFile());
|
||
if (stream_sp)
|
||
{
|
||
stream_sp->Printf ("ThreadSanitizer debugger support is active.\n");
|
||
}
|
||
|
||
m_is_active = true;
|
||
}
|
||
|
||
void
|
||
ThreadSanitizerRuntime::Deactivate()
|
||
{
|
||
if (m_breakpoint_id != LLDB_INVALID_BREAK_ID)
|
||
{
|
||
ProcessSP process_sp = GetProcessSP();
|
||
if (process_sp)
|
||
{
|
||
process_sp->GetTarget().RemoveBreakpointByID(m_breakpoint_id);
|
||
m_breakpoint_id = LLDB_INVALID_BREAK_ID;
|
||
}
|
||
}
|
||
m_is_active = false;
|
||
}
|