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//===-- CommandObjectThreadUtil.cpp -----------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "CommandObjectThreadUtil.h"
#include "lldb/Interpreter/CommandReturnObject.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Thread.h"
using namespace lldb;
using namespace lldb_private;
using namespace llvm;
CommandObjectIterateOverThreads::CommandObjectIterateOverThreads(
CommandInterpreter &interpreter, const char *name, const char *help,
const char *syntax, uint32_t flags)
: CommandObjectParsed(interpreter, name, help, syntax, flags) {}
bool CommandObjectIterateOverThreads::DoExecute(Args &command,
CommandReturnObject &result) {
result.SetStatus(m_success_return);
bool all_threads = false;
if (command.GetArgumentCount() == 0) {
Thread *thread = m_exe_ctx.GetThreadPtr();
if (!thread || !HandleOneThread(thread->GetID(), result))
return false;
return result.Succeeded();
} else if (command.GetArgumentCount() == 1) {
all_threads = ::strcmp(command.GetArgumentAtIndex(0), "all") == 0;
m_unique_stacks = ::strcmp(command.GetArgumentAtIndex(0), "unique") == 0;
}
// Use tids instead of ThreadSPs to prevent deadlocking problems which
// result from JIT-ing code while iterating over the (locked) ThreadSP
// list.
std::vector<lldb::tid_t> tids;
if (all_threads || m_unique_stacks) {
Process *process = m_exe_ctx.GetProcessPtr();
for (ThreadSP thread_sp : process->Threads())
tids.push_back(thread_sp->GetID());
} else {
const size_t num_args = command.GetArgumentCount();
Process *process = m_exe_ctx.GetProcessPtr();
std::lock_guard<std::recursive_mutex> guard(
process->GetThreadList().GetMutex());
for (size_t i = 0; i < num_args; i++) {
uint32_t thread_idx;
if (!llvm::to_integer(command.GetArgumentAtIndex(i), thread_idx)) {
result.AppendErrorWithFormat("invalid thread specification: \"%s\"\n",
command.GetArgumentAtIndex(i));
result.SetStatus(eReturnStatusFailed);
return false;
}
ThreadSP thread =
process->GetThreadList().FindThreadByIndexID(thread_idx);
if (!thread) {
result.AppendErrorWithFormat("no thread with index: \"%s\"\n",
command.GetArgumentAtIndex(i));
result.SetStatus(eReturnStatusFailed);
return false;
}
tids.push_back(thread->GetID());
}
}
if (m_unique_stacks) {
// Iterate over threads, finding unique stack buckets.
std::set<UniqueStack> unique_stacks;
for (const lldb::tid_t &tid : tids) {
if (!BucketThread(tid, unique_stacks, result)) {
return false;
}
}
// Write the thread id's and unique call stacks to the output stream
Stream &strm = result.GetOutputStream();
Process *process = m_exe_ctx.GetProcessPtr();
for (const UniqueStack &stack : unique_stacks) {
// List the common thread ID's
const std::vector<uint32_t> &thread_index_ids =
stack.GetUniqueThreadIndexIDs();
strm.Format("{0} thread(s) ", thread_index_ids.size());
for (const uint32_t &thread_index_id : thread_index_ids) {
strm.Format("#{0} ", thread_index_id);
}
strm.EOL();
// List the shared call stack for this set of threads
uint32_t representative_thread_id = stack.GetRepresentativeThread();
ThreadSP thread = process->GetThreadList().FindThreadByIndexID(
representative_thread_id);
if (!HandleOneThread(thread->GetID(), result)) {
return false;
}
}
} else {
uint32_t idx = 0;
for (const lldb::tid_t &tid : tids) {
if (idx != 0 && m_add_return)
result.AppendMessage("");
if (!HandleOneThread(tid, result))
return false;
++idx;
}
}
return result.Succeeded();
}
bool CommandObjectIterateOverThreads::BucketThread(
lldb::tid_t tid, std::set<UniqueStack> &unique_stacks,
CommandReturnObject &result) {
// Grab the corresponding thread for the given thread id.
Process *process = m_exe_ctx.GetProcessPtr();
Thread *thread = process->GetThreadList().FindThreadByID(tid).get();
if (thread == nullptr) {
result.AppendErrorWithFormatv("Failed to process thread #{0}.\n", tid);
result.SetStatus(eReturnStatusFailed);
return false;
}
// Collect the each frame's address for this call-stack
std::stack<lldb::addr_t> stack_frames;
const uint32_t frame_count = thread->GetStackFrameCount();
for (uint32_t frame_index = 0; frame_index < frame_count; frame_index++) {
const lldb::StackFrameSP frame_sp =
thread->GetStackFrameAtIndex(frame_index);
const lldb::addr_t pc = frame_sp->GetStackID().GetPC();
stack_frames.push(pc);
}
uint32_t thread_index_id = thread->GetIndexID();
UniqueStack new_unique_stack(stack_frames, thread_index_id);
// Try to match the threads stack to and existing entry.
std::set<UniqueStack>::iterator matching_stack =
unique_stacks.find(new_unique_stack);
if (matching_stack != unique_stacks.end()) {
matching_stack->AddThread(thread_index_id);
} else {
unique_stacks.insert(new_unique_stack);
}
return true;
}
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