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llvm/lldb/source/Target/TargetList.cpp
Vedant Kumar 65d15fefe3 [TargetList] Delete the destructor 
AFAICT, ~TargetList simply implements the default destructor, plus some
locking.

The history is murky, so I'm not sure why we do this locking. Perhaps,
at some point, it was possible to delete the same TargetList instance
from two different threads, setting up a race. If that were true, then
the locking would protect against the race.

Since TargetList is uniquely owned by Debugger (m_target_list), no such
race is possible today.

Testing: check-lldb

Differential Revision: https://reviews.llvm.org/D90895
2020-11-05 16:56:37 -08:00

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//===-- TargetList.cpp ----------------------------------------------------===//
//
// 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 "lldb/Target/TargetList.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Host/Host.h"
#include "lldb/Host/HostInfo.h"
#include "lldb/Interpreter/CommandInterpreter.h"
#include "lldb/Interpreter/OptionGroupPlatform.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Target/Platform.h"
#include "lldb/Target/Process.h"
#include "lldb/Utility/Broadcaster.h"
#include "lldb/Utility/Event.h"
#include "lldb/Utility/State.h"
#include "lldb/Utility/TildeExpressionResolver.h"
#include "lldb/Utility/Timer.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/FileSystem.h"
using namespace lldb;
using namespace lldb_private;
ConstString &TargetList::GetStaticBroadcasterClass() {
static ConstString class_name("lldb.targetList");
return class_name;
}
// TargetList constructor
TargetList::TargetList(Debugger &debugger)
: Broadcaster(debugger.GetBroadcasterManager(),
TargetList::GetStaticBroadcasterClass().AsCString()),
m_target_list(), m_target_list_mutex(), m_selected_target_idx(0) {
CheckInWithManager();
}
Status TargetList::CreateTarget(Debugger &debugger,
llvm::StringRef user_exe_path,
llvm::StringRef triple_str,
LoadDependentFiles load_dependent_files,
const OptionGroupPlatform *platform_options,
TargetSP &target_sp) {
return CreateTargetInternal(debugger, user_exe_path, triple_str,
load_dependent_files, platform_options,
target_sp);
}
Status TargetList::CreateTarget(Debugger &debugger,
llvm::StringRef user_exe_path,
const ArchSpec &specified_arch,
LoadDependentFiles load_dependent_files,
PlatformSP &platform_sp, TargetSP &target_sp) {
return CreateTargetInternal(debugger, user_exe_path, specified_arch,
load_dependent_files, platform_sp, target_sp);
}
Status TargetList::CreateTargetInternal(
Debugger &debugger, llvm::StringRef user_exe_path,
llvm::StringRef triple_str, LoadDependentFiles load_dependent_files,
const OptionGroupPlatform *platform_options, TargetSP &target_sp) {
Status error;
// Let's start by looking at the selected platform.
PlatformSP platform_sp = debugger.GetPlatformList().GetSelectedPlatform();
// This variable corresponds to the architecture specified by the triple
// string. If that string was empty the currently selected platform will
// determine the architecture.
const ArchSpec arch(triple_str);
if (!triple_str.empty() && !arch.IsValid()) {
error.SetErrorStringWithFormat("invalid triple '%s'",
triple_str.str().c_str());
return error;
}
ArchSpec platform_arch(arch);
// Create a new platform if a platform was specified in the platform options
// and doesn't match the selected platform.
if (platform_options && platform_options->PlatformWasSpecified() &&
!platform_options->PlatformMatches(platform_sp)) {
const bool select_platform = true;
platform_sp = platform_options->CreatePlatformWithOptions(
debugger.GetCommandInterpreter(), arch, select_platform, error,
platform_arch);
if (!platform_sp)
return error;
}
bool prefer_platform_arch = false;
auto update_platform_arch = [&](const ArchSpec &module_arch) {
// If the OS or vendor weren't specified, then adopt the module's
// architecture so that the platform matching can be more accurate.
if (!platform_arch.TripleOSWasSpecified() ||
!platform_arch.TripleVendorWasSpecified()) {
prefer_platform_arch = true;
platform_arch = module_arch;
}
};
if (!user_exe_path.empty()) {
ModuleSpec module_spec(FileSpec(user_exe_path, FileSpec::Style::native));
FileSystem::Instance().Resolve(module_spec.GetFileSpec());
// Resolve the executable in case we are given a path to a application
// bundle like a .app bundle on MacOSX.
Host::ResolveExecutableInBundle(module_spec.GetFileSpec());
lldb::offset_t file_offset = 0;
lldb::offset_t file_size = 0;
ModuleSpecList module_specs;
const size_t num_specs = ObjectFile::GetModuleSpecifications(
module_spec.GetFileSpec(), file_offset, file_size, module_specs);
if (num_specs > 0) {
ModuleSpec matching_module_spec;
if (num_specs == 1) {
if (module_specs.GetModuleSpecAtIndex(0, matching_module_spec)) {
if (platform_arch.IsValid()) {
if (platform_arch.IsCompatibleMatch(
matching_module_spec.GetArchitecture())) {
// If the OS or vendor weren't specified, then adopt the module's
// architecture so that the platform matching can be more
// accurate.
update_platform_arch(matching_module_spec.GetArchitecture());
} else {
StreamString platform_arch_strm;
StreamString module_arch_strm;
platform_arch.DumpTriple(platform_arch_strm.AsRawOstream());
matching_module_spec.GetArchitecture().DumpTriple(
module_arch_strm.AsRawOstream());
error.SetErrorStringWithFormat(
"the specified architecture '%s' is not compatible with '%s' "
"in '%s'",
platform_arch_strm.GetData(), module_arch_strm.GetData(),
module_spec.GetFileSpec().GetPath().c_str());
return error;
}
} else {
// Only one arch and none was specified.
prefer_platform_arch = true;
platform_arch = matching_module_spec.GetArchitecture();
}
}
} else if (arch.IsValid()) {
// Fat binary. A (valid) architecture was specified.
module_spec.GetArchitecture() = arch;
if (module_specs.FindMatchingModuleSpec(module_spec,
matching_module_spec))
update_platform_arch(matching_module_spec.GetArchitecture());
} else {
// Fat binary. No architecture specified, check if there is
// only one platform for all of the architectures.
PlatformSP host_platform_sp = Platform::GetHostPlatform();
std::vector<PlatformSP> platforms;
for (size_t i = 0; i < num_specs; ++i) {
ModuleSpec module_spec;
if (module_specs.GetModuleSpecAtIndex(i, module_spec)) {
// First consider the platform specified by the user, if any, and
// the selected platform otherwise.
if (platform_sp) {
if (platform_sp->IsCompatibleArchitecture(
module_spec.GetArchitecture(), false, nullptr)) {
platforms.push_back(platform_sp);
continue;
}
}
// Now consider the host platform if it is different from the
// specified/selected platform.
if (host_platform_sp &&
(!platform_sp ||
host_platform_sp->GetName() != platform_sp->GetName())) {
if (host_platform_sp->IsCompatibleArchitecture(
module_spec.GetArchitecture(), false, nullptr)) {
platforms.push_back(host_platform_sp);
continue;
}
}
// Finally find a platform that matches the architecture in the
// executable file.
PlatformSP fallback_platform_sp(
Platform::GetPlatformForArchitecture(
module_spec.GetArchitecture(), nullptr));
if (fallback_platform_sp) {
platforms.push_back(fallback_platform_sp);
}
}
}
Platform *platform_ptr = nullptr;
bool more_than_one_platforms = false;
for (const auto &the_platform_sp : platforms) {
if (platform_ptr) {
if (platform_ptr->GetName() != the_platform_sp->GetName()) {
more_than_one_platforms = true;
platform_ptr = nullptr;
break;
}
} else {
platform_ptr = the_platform_sp.get();
}
}
if (platform_ptr) {
// All platforms for all modules in the executable match, so we can
// select this platform.
platform_sp = platforms.front();
} else if (!more_than_one_platforms) {
// No platforms claim to support this file.
error.SetErrorString("no matching platforms found for this file");
return error;
} else {
// More than one platform claims to support this file.
StreamString error_strm;
std::set<Platform *> platform_set;
error_strm.Printf(
"more than one platform supports this executable (");
for (const auto &the_platform_sp : platforms) {
if (platform_set.find(the_platform_sp.get()) ==
platform_set.end()) {
if (!platform_set.empty())
error_strm.PutCString(", ");
error_strm.PutCString(the_platform_sp->GetName().GetCString());
platform_set.insert(the_platform_sp.get());
}
}
error_strm.Printf("), specify an architecture to disambiguate");
error.SetErrorString(error_strm.GetString());
return error;
}
}
}
}
// If we have a valid architecture, make sure the current platform is
// compatible with that architecture.
if (!prefer_platform_arch && arch.IsValid()) {
if (!platform_sp->IsCompatibleArchitecture(arch, false, nullptr)) {
platform_sp = Platform::GetPlatformForArchitecture(arch, &platform_arch);
if (platform_sp)
debugger.GetPlatformList().SetSelectedPlatform(platform_sp);
}
} else if (platform_arch.IsValid()) {
// If "arch" isn't valid, yet "platform_arch" is, it means we have an
// executable file with a single architecture which should be used.
ArchSpec fixed_platform_arch;
if (!platform_sp->IsCompatibleArchitecture(platform_arch, false, nullptr)) {
platform_sp = Platform::GetPlatformForArchitecture(platform_arch,
&fixed_platform_arch);
if (platform_sp)
debugger.GetPlatformList().SetSelectedPlatform(platform_sp);
}
}
if (!platform_arch.IsValid())
platform_arch = arch;
return TargetList::CreateTargetInternal(debugger, user_exe_path,
platform_arch, load_dependent_files,
platform_sp, target_sp);
}
Status TargetList::CreateTargetInternal(Debugger &debugger,
llvm::StringRef user_exe_path,
const ArchSpec &specified_arch,
LoadDependentFiles load_dependent_files,
lldb::PlatformSP &platform_sp,
lldb::TargetSP &target_sp) {
static Timer::Category func_cat(LLVM_PRETTY_FUNCTION);
Timer scoped_timer(
func_cat, "TargetList::CreateTarget (file = '%s', arch = '%s')",
user_exe_path.str().c_str(), specified_arch.GetArchitectureName());
Status error;
const bool is_dummy_target = false;
ArchSpec arch(specified_arch);
if (arch.IsValid()) {
if (!platform_sp ||
!platform_sp->IsCompatibleArchitecture(arch, false, nullptr))
platform_sp = Platform::GetPlatformForArchitecture(specified_arch, &arch);
}
if (!platform_sp)
platform_sp = debugger.GetPlatformList().GetSelectedPlatform();
if (!arch.IsValid())
arch = specified_arch;
FileSpec file(user_exe_path);
if (!FileSystem::Instance().Exists(file) && user_exe_path.startswith("~")) {
// we want to expand the tilde but we don't want to resolve any symbolic
// links so we can't use the FileSpec constructor's resolve flag
llvm::SmallString<64> unglobbed_path;
StandardTildeExpressionResolver Resolver;
Resolver.ResolveFullPath(user_exe_path, unglobbed_path);
if (unglobbed_path.empty())
file = FileSpec(user_exe_path);
else
file = FileSpec(unglobbed_path.c_str());
}
bool user_exe_path_is_bundle = false;
char resolved_bundle_exe_path[PATH_MAX];
resolved_bundle_exe_path[0] = '\0';
if (file) {
if (FileSystem::Instance().IsDirectory(file))
user_exe_path_is_bundle = true;
if (file.IsRelative() && !user_exe_path.empty()) {
llvm::SmallString<64> cwd;
if (! llvm::sys::fs::current_path(cwd)) {
FileSpec cwd_file(cwd.c_str());
cwd_file.AppendPathComponent(file);
if (FileSystem::Instance().Exists(cwd_file))
file = cwd_file;
}
}
ModuleSP exe_module_sp;
if (platform_sp) {
FileSpecList executable_search_paths(
Target::GetDefaultExecutableSearchPaths());
ModuleSpec module_spec(file, arch);
error = platform_sp->ResolveExecutable(module_spec, exe_module_sp,
executable_search_paths.GetSize()
? &executable_search_paths
: nullptr);
}
if (error.Success() && exe_module_sp) {
if (exe_module_sp->GetObjectFile() == nullptr) {
if (arch.IsValid()) {
error.SetErrorStringWithFormat(
"\"%s\" doesn't contain architecture %s", file.GetPath().c_str(),
arch.GetArchitectureName());
} else {
error.SetErrorStringWithFormat("unsupported file type \"%s\"",
file.GetPath().c_str());
}
return error;
}
target_sp.reset(new Target(debugger, arch, platform_sp, is_dummy_target));
target_sp->SetExecutableModule(exe_module_sp, load_dependent_files);
if (user_exe_path_is_bundle)
exe_module_sp->GetFileSpec().GetPath(resolved_bundle_exe_path,
sizeof(resolved_bundle_exe_path));
if (target_sp->GetPreloadSymbols())
exe_module_sp->PreloadSymbols();
}
} else {
// No file was specified, just create an empty target with any arch if a
// valid arch was specified
target_sp.reset(new Target(debugger, arch, platform_sp, is_dummy_target));
}
if (!target_sp)
return error;
// Set argv0 with what the user typed, unless the user specified a
// directory. If the user specified a directory, then it is probably a
// bundle that was resolved and we need to use the resolved bundle path
if (!user_exe_path.empty()) {
// Use exactly what the user typed as the first argument when we exec or
// posix_spawn
if (user_exe_path_is_bundle && resolved_bundle_exe_path[0]) {
target_sp->SetArg0(resolved_bundle_exe_path);
} else {
// Use resolved path
target_sp->SetArg0(file.GetPath().c_str());
}
}
if (file.GetDirectory()) {
FileSpec file_dir;
file_dir.GetDirectory() = file.GetDirectory();
target_sp->AppendExecutableSearchPaths(file_dir);
}
std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
m_selected_target_idx = m_target_list.size();
m_target_list.push_back(target_sp);
// Now prime this from the dummy target:
target_sp->PrimeFromDummyTarget(debugger.GetDummyTarget());
return error;
}
bool TargetList::DeleteTarget(TargetSP &target_sp) {
std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
collection::iterator pos, end = m_target_list.end();
for (pos = m_target_list.begin(); pos != end; ++pos) {
if (pos->get() == target_sp.get()) {
m_target_list.erase(pos);
return true;
}
}
return false;
}
TargetSP TargetList::FindTargetWithExecutableAndArchitecture(
const FileSpec &exe_file_spec, const ArchSpec *exe_arch_ptr) const {
std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
TargetSP target_sp;
collection::const_iterator pos, end = m_target_list.end();
for (pos = m_target_list.begin(); pos != end; ++pos) {
Module *exe_module = (*pos)->GetExecutableModulePointer();
if (exe_module) {
if (FileSpec::Match(exe_file_spec, exe_module->GetFileSpec())) {
if (exe_arch_ptr) {
if (!exe_arch_ptr->IsCompatibleMatch(exe_module->GetArchitecture()))
continue;
}
target_sp = *pos;
break;
}
}
}
return target_sp;
}
TargetSP TargetList::FindTargetWithProcessID(lldb::pid_t pid) const {
std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
TargetSP target_sp;
collection::const_iterator pos, end = m_target_list.end();
for (pos = m_target_list.begin(); pos != end; ++pos) {
Process *process = (*pos)->GetProcessSP().get();
if (process && process->GetID() == pid) {
target_sp = *pos;
break;
}
}
return target_sp;
}
TargetSP TargetList::FindTargetWithProcess(Process *process) const {
TargetSP target_sp;
if (process) {
std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
collection::const_iterator pos, end = m_target_list.end();
for (pos = m_target_list.begin(); pos != end; ++pos) {
if (process == (*pos)->GetProcessSP().get()) {
target_sp = *pos;
break;
}
}
}
return target_sp;
}
TargetSP TargetList::GetTargetSP(Target *target) const {
TargetSP target_sp;
if (target) {
std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
collection::const_iterator pos, end = m_target_list.end();
for (pos = m_target_list.begin(); pos != end; ++pos) {
if (target == (*pos).get()) {
target_sp = *pos;
break;
}
}
}
return target_sp;
}
uint32_t TargetList::SendAsyncInterrupt(lldb::pid_t pid) {
uint32_t num_async_interrupts_sent = 0;
if (pid != LLDB_INVALID_PROCESS_ID) {
TargetSP target_sp(FindTargetWithProcessID(pid));
if (target_sp) {
Process *process = target_sp->GetProcessSP().get();
if (process) {
process->SendAsyncInterrupt();
++num_async_interrupts_sent;
}
}
} else {
// We don't have a valid pid to broadcast to, so broadcast to the target
// list's async broadcaster...
BroadcastEvent(Process::eBroadcastBitInterrupt, nullptr);
}
return num_async_interrupts_sent;
}
uint32_t TargetList::SignalIfRunning(lldb::pid_t pid, int signo) {
uint32_t num_signals_sent = 0;
Process *process = nullptr;
if (pid == LLDB_INVALID_PROCESS_ID) {
// Signal all processes with signal
std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
collection::iterator pos, end = m_target_list.end();
for (pos = m_target_list.begin(); pos != end; ++pos) {
process = (*pos)->GetProcessSP().get();
if (process) {
if (process->IsAlive()) {
++num_signals_sent;
process->Signal(signo);
}
}
}
} else {
// Signal a specific process with signal
TargetSP target_sp(FindTargetWithProcessID(pid));
if (target_sp) {
process = target_sp->GetProcessSP().get();
if (process) {
if (process->IsAlive()) {
++num_signals_sent;
process->Signal(signo);
}
}
}
}
return num_signals_sent;
}
int TargetList::GetNumTargets() const {
std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
return m_target_list.size();
}
lldb::TargetSP TargetList::GetTargetAtIndex(uint32_t idx) const {
TargetSP target_sp;
std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
if (idx < m_target_list.size())
target_sp = m_target_list[idx];
return target_sp;
}
uint32_t TargetList::GetIndexOfTarget(lldb::TargetSP target_sp) const {
std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
size_t num_targets = m_target_list.size();
for (size_t idx = 0; idx < num_targets; idx++) {
if (target_sp == m_target_list[idx])
return idx;
}
return UINT32_MAX;
}
uint32_t TargetList::SetSelectedTarget(Target *target) {
std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
collection::const_iterator pos, begin = m_target_list.begin(),
end = m_target_list.end();
for (pos = begin; pos != end; ++pos) {
if (pos->get() == target) {
m_selected_target_idx = std::distance(begin, pos);
return m_selected_target_idx;
}
}
m_selected_target_idx = 0;
return m_selected_target_idx;
}
lldb::TargetSP TargetList::GetSelectedTarget() {
std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
if (m_selected_target_idx >= m_target_list.size())
m_selected_target_idx = 0;
return GetTargetAtIndex(m_selected_target_idx);
}
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