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| //===-- source/Host/windows/Host.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 "lldb/Host/windows/AutoHandle.h"
#include "lldb/Host/windows/windows.h"
#include <stdio.h>
#include "lldb/Host/FileSystem.h"
#include "lldb/Host/Host.h"
#include "lldb/Host/HostInfo.h"
#include "lldb/Host/ProcessLaunchInfo.h"
#include "lldb/Utility/DataBufferHeap.h"
#include "lldb/Utility/DataExtractor.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/ProcessInfo.h"
#include "lldb/Utility/Status.h"
#include "lldb/Utility/StreamString.h"
#include "lldb/Utility/StructuredData.h"
#include "llvm/Support/ConvertUTF.h"
// Windows includes
#include <tlhelp32.h>
using namespace lldb;
using namespace lldb_private;
namespace {
bool GetTripleForProcess(const FileSpec &executable, llvm::Triple &triple) {
// Open the PE File as a binary file, and parse just enough information to
// determine the machine type.
auto imageBinaryP = FileSystem::Instance().Open(
executable, File::eOpenOptionRead, lldb::eFilePermissionsUserRead);
if (!imageBinaryP)
return llvm::errorToBool(imageBinaryP.takeError());
File &imageBinary = *imageBinaryP.get();
imageBinary.SeekFromStart(0x3c);
int32_t peOffset = 0;
uint32_t peHead = 0;
uint16_t machineType = 0;
size_t readSize = sizeof(peOffset);
imageBinary.Read(&peOffset, readSize);
imageBinary.SeekFromStart(peOffset);
imageBinary.Read(&peHead, readSize);
if (peHead != 0x00004550) // "PE\0\0", little-endian
return false; // Status: Can't find PE header
readSize = 2;
imageBinary.Read(&machineType, readSize);
triple.setVendor(llvm::Triple::PC);
triple.setOS(llvm::Triple::Win32);
triple.setArch(llvm::Triple::UnknownArch);
if (machineType == 0x8664)
triple.setArch(llvm::Triple::x86_64);
else if (machineType == 0x14c)
triple.setArch(llvm::Triple::x86);
else if (machineType == 0x1c4)
triple.setArch(llvm::Triple::arm);
else if (machineType == 0xaa64)
triple.setArch(llvm::Triple::aarch64);
return true;
}
bool GetExecutableForProcess(const AutoHandle &handle, std::string &path) {
// Get the process image path. MAX_PATH isn't long enough, paths can
// actually be up to 32KB.
std::vector<wchar_t> buffer(PATH_MAX);
DWORD dwSize = buffer.size();
if (!::QueryFullProcessImageNameW(handle.get(), 0, &buffer[0], &dwSize))
return false;
return llvm::convertWideToUTF8(buffer.data(), path);
}
void GetProcessExecutableAndTriple(const AutoHandle &handle,
ProcessInstanceInfo &process) {
// We may not have permissions to read the path from the process. So start
// off by setting the executable file to whatever Toolhelp32 gives us, and
// then try to enhance this with more detailed information, but fail
// gracefully.
std::string executable;
llvm::Triple triple;
triple.setVendor(llvm::Triple::PC);
triple.setOS(llvm::Triple::Win32);
triple.setArch(llvm::Triple::UnknownArch);
if (GetExecutableForProcess(handle, executable)) {
FileSpec executableFile(executable.c_str());
process.SetExecutableFile(executableFile, true);
GetTripleForProcess(executableFile, triple);
}
process.SetArchitecture(ArchSpec(triple));
// TODO(zturner): Add the ability to get the process user name.
}
}
lldb::thread_t Host::GetCurrentThread() {
return lldb::thread_t(::GetCurrentThread());
}
void Host::Kill(lldb::pid_t pid, int signo) {
TerminateProcess((HANDLE)pid, 1);
}
const char *Host::GetSignalAsCString(int signo) { return NULL; }
FileSpec Host::GetModuleFileSpecForHostAddress(const void *host_addr) {
FileSpec module_filespec;
HMODULE hmodule = NULL;
if (!::GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
(LPCTSTR)host_addr, &hmodule))
return module_filespec;
std::vector<wchar_t> buffer(PATH_MAX);
DWORD chars_copied = 0;
do {
chars_copied = ::GetModuleFileNameW(hmodule, &buffer[0], buffer.size());
if (chars_copied == buffer.size() &&
::GetLastError() == ERROR_INSUFFICIENT_BUFFER)
buffer.resize(buffer.size() * 2);
} while (chars_copied >= buffer.size());
std::string path;
if (!llvm::convertWideToUTF8(buffer.data(), path))
return module_filespec;
module_filespec.SetFile(path, FileSpec::Style::native);
return module_filespec;
}
uint32_t Host::FindProcesses(const ProcessInstanceInfoMatch &match_info,
ProcessInstanceInfoList &process_infos) {
process_infos.Clear();
AutoHandle snapshot(CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0));
if (!snapshot.IsValid())
return 0;
PROCESSENTRY32W pe = {};
pe.dwSize = sizeof(PROCESSENTRY32W);
if (Process32FirstW(snapshot.get(), &pe)) {
do {
AutoHandle handle(::OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, FALSE,
pe.th32ProcessID),
nullptr);
ProcessInstanceInfo process;
std::string exeFile;
llvm::convertWideToUTF8(pe.szExeFile, exeFile);
process.SetExecutableFile(FileSpec(exeFile), true);
process.SetProcessID(pe.th32ProcessID);
process.SetParentProcessID(pe.th32ParentProcessID);
GetProcessExecutableAndTriple(handle, process);
if (match_info.MatchAllProcesses() || match_info.Matches(process))
process_infos.Append(process);
} while (Process32NextW(snapshot.get(), &pe));
}
return process_infos.GetSize();
}
bool Host::GetProcessInfo(lldb::pid_t pid, ProcessInstanceInfo &process_info) {
process_info.Clear();
AutoHandle handle(
::OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, pid),
nullptr);
if (!handle.IsValid())
return false;
process_info.SetProcessID(pid);
GetProcessExecutableAndTriple(handle, process_info);
// Need to read the PEB to get parent process and command line arguments.
AutoHandle snapshot(CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0));
if (!snapshot.IsValid())
return false;
PROCESSENTRY32W pe;
pe.dwSize = sizeof(PROCESSENTRY32W);
if (Process32FirstW(snapshot.get(), &pe)) {
do {
if (pe.th32ProcessID == pid) {
process_info.SetParentProcessID(pe.th32ParentProcessID);
return true;
}
} while (Process32NextW(snapshot.get(), &pe));
}
return false;
}
llvm::Expected<HostThread> Host::StartMonitoringChildProcess(
const Host::MonitorChildProcessCallback &callback, lldb::pid_t pid,
bool monitor_signals) {
return HostThread();
}
Status Host::ShellExpandArguments(ProcessLaunchInfo &launch_info) {
Status error;
if (launch_info.GetFlags().Test(eLaunchFlagShellExpandArguments)) {
FileSpec expand_tool_spec = HostInfo::GetSupportExeDir();
if (!expand_tool_spec) {
error.SetErrorString("could not find support executable directory for "
"the lldb-argdumper tool");
return error;
}
expand_tool_spec.AppendPathComponent("lldb-argdumper.exe");
if (!FileSystem::Instance().Exists(expand_tool_spec)) {
error.SetErrorString("could not find the lldb-argdumper tool");
return error;
}
std::string quoted_cmd_string;
launch_info.GetArguments().GetQuotedCommandString(quoted_cmd_string);
std::replace(quoted_cmd_string.begin(), quoted_cmd_string.end(), '\\', '/');
StreamString expand_command;
expand_command.Printf("\"%s\" %s", expand_tool_spec.GetPath().c_str(),
quoted_cmd_string.c_str());
int status;
std::string output;
std::string command = expand_command.GetString();
Status e =
RunShellCommand(command.c_str(), launch_info.GetWorkingDirectory(),
&status, nullptr, &output, std::chrono::seconds(10));
if (e.Fail())
return e;
if (status != 0) {
error.SetErrorStringWithFormat("lldb-argdumper exited with error %d",
status);
return error;
}
auto data_sp = StructuredData::ParseJSON(output);
if (!data_sp) {
error.SetErrorString("invalid JSON");
return error;
}
auto dict_sp = data_sp->GetAsDictionary();
if (!data_sp) {
error.SetErrorString("invalid JSON");
return error;
}
auto args_sp = dict_sp->GetObjectForDotSeparatedPath("arguments");
if (!args_sp) {
error.SetErrorString("invalid JSON");
return error;
}
auto args_array_sp = args_sp->GetAsArray();
if (!args_array_sp) {
error.SetErrorString("invalid JSON");
return error;
}
launch_info.GetArguments().Clear();
for (size_t i = 0; i < args_array_sp->GetSize(); i++) {
auto item_sp = args_array_sp->GetItemAtIndex(i);
if (!item_sp)
continue;
auto str_sp = item_sp->GetAsString();
if (!str_sp)
continue;
launch_info.GetArguments().AppendArgument(str_sp->GetValue());
}
}
return error;
}
Environment Host::GetEnvironment() {
Environment env;
// The environment block on Windows is a contiguous buffer of NULL terminated
// strings, where the end of the environment block is indicated by two
// consecutive NULLs.
LPWCH environment_block = ::GetEnvironmentStringsW();
while (*environment_block != L'\0') {
std::string current_var;
auto current_var_size = wcslen(environment_block) + 1;
if (!llvm::convertWideToUTF8(environment_block, current_var)) {
environment_block += current_var_size;
continue;
}
if (current_var[0] != '=')
env.insert(current_var);
environment_block += current_var_size;
}
return env;
}
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