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//===-- MemoryHistoryASan.cpp -----------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "MemoryHistoryASan.h"
#include "lldb/Target/MemoryHistory.h"
#include "lldb/lldb-private.h"
#include "lldb/Core/PluginInterface.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Target/ThreadList.h"
#include "lldb/Target/ExecutionContext.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
#include "lldb/Core/Module.h"
#include "Plugins/Process/Utility/HistoryThread.h"
#include "lldb/Core/ValueObject.h"
using namespace lldb;
using namespace lldb_private;
MemoryHistorySP
MemoryHistoryASan::CreateInstance (const ProcessSP &process_sp)
{
if (!process_sp.get())
return NULL;
Target & target = process_sp->GetTarget();
const ModuleList &target_modules = target.GetImages();
Mutex::Locker modules_locker(target_modules.GetMutex());
const size_t num_modules = target_modules.GetSize();
for (size_t i = 0; i < num_modules; ++i)
{
Module *module_pointer = target_modules.GetModulePointerAtIndexUnlocked(i);
const Symbol* symbol = module_pointer->FindFirstSymbolWithNameAndType(
ConstString("__asan_get_alloc_stack"),
lldb::eSymbolTypeAny);
if (symbol != nullptr)
return MemoryHistorySP(new MemoryHistoryASan(process_sp));
}
return MemoryHistorySP();
}
void
MemoryHistoryASan::Initialize()
{
PluginManager::RegisterPlugin (GetPluginNameStatic(),
"ASan memory history provider.",
CreateInstance);
}
void
MemoryHistoryASan::Terminate()
{
PluginManager::UnregisterPlugin (CreateInstance);
}
ConstString
MemoryHistoryASan::GetPluginNameStatic()
{
static ConstString g_name("asan");
return g_name;
}
MemoryHistoryASan::MemoryHistoryASan(const ProcessSP &process_sp)
{
if (process_sp)
m_process_wp = process_sp;
}
const char *
memory_history_asan_command_format = R"(
struct t {
void *alloc_trace[256];
size_t alloc_count;
int alloc_tid;
void *free_trace[256];
size_t free_count;
int free_tid;
} t;
t.alloc_count = ((size_t (*) (void *, void **, size_t, int *))__asan_get_alloc_stack)((void *)0x%)" PRIx64 R"(, t.alloc_trace, 256, &t.alloc_tid);
t.free_count = ((size_t (*) (void *, void **, size_t, int *))__asan_get_free_stack)((void *)0x%)" PRIx64 R"(, t.free_trace, 256, &t.free_tid);
t;
)";
static void CreateHistoryThreadFromValueObject(ProcessSP process_sp, ValueObjectSP return_value_sp, const char *type, const char *thread_name, HistoryThreads & result)
{
std::string count_path = "." + std::string(type) + "_count";
std::string tid_path = "." + std::string(type) + "_tid";
std::string trace_path = "." + std::string(type) + "_trace";
ValueObjectSP count_sp = return_value_sp->GetValueForExpressionPath(count_path.c_str());
ValueObjectSP tid_sp = return_value_sp->GetValueForExpressionPath(tid_path.c_str());
if (!count_sp || !tid_sp)
return;
int count = count_sp->GetValueAsUnsigned(0);
tid_t tid = tid_sp->GetValueAsUnsigned(0);
if (count <= 0)
return;
ValueObjectSP trace_sp = return_value_sp->GetValueForExpressionPath(trace_path.c_str());
if (!trace_sp)
return;
std::vector<lldb::addr_t> pcs;
for (int i = 0; i < count; i++)
{
addr_t pc = trace_sp->GetChildAtIndex(i, true)->GetValueAsUnsigned(0);
if (pc == 0 || pc == 1 || pc == LLDB_INVALID_ADDRESS)
continue;
pcs.push_back(pc);
}
HistoryThread *history_thread = new HistoryThread(*process_sp, tid, pcs, 0, false);
ThreadSP new_thread_sp(history_thread);
// let's use thread name for the type of history thread, since history threads don't have names anyway
history_thread->SetThreadName(thread_name);
// Save this in the Process' ExtendedThreadList so a strong pointer retains the object
process_sp->GetExtendedThreadList().AddThread (new_thread_sp);
result.push_back(new_thread_sp);
}
#define GET_STACK_FUNCTION_TIMEOUT_USEC 2*1000*1000
HistoryThreads
MemoryHistoryASan::GetHistoryThreads(lldb::addr_t address)
{
HistoryThreads result;
ProcessSP process_sp = m_process_wp.lock();
if (process_sp)
{
ThreadSP thread_sp = process_sp->GetThreadList().GetSelectedThread();
if (thread_sp)
{
StackFrameSP frame_sp = thread_sp->GetSelectedFrame();
if (frame_sp)
{
ExecutionContext exe_ctx (frame_sp);
ValueObjectSP return_value_sp;
StreamString expr;
expr.Printf(memory_history_asan_command_format, address, address);
EvaluateExpressionOptions options;
options.SetUnwindOnError(true);
options.SetTryAllThreads(true);
options.SetStopOthers(true);
options.SetIgnoreBreakpoints(true);
options.SetTimeoutUsec(GET_STACK_FUNCTION_TIMEOUT_USEC);
if (process_sp->GetTarget().EvaluateExpression(expr.GetData(), frame_sp.get(), return_value_sp, options) == eExpressionCompleted)
{
if (return_value_sp)
{
CreateHistoryThreadFromValueObject(process_sp, return_value_sp, "free", "Memory deallocated at", result);
CreateHistoryThreadFromValueObject(process_sp, return_value_sp, "alloc", "Memory allocated at", result);
}
}
}
}
}
return result;
}
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