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llvm-project/lldb/source/Plugins/Platform/Windows/PlatformWindows.cpp

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//===-- PlatformWindows.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 "PlatformWindows.h"
#include <cstdio>
#if defined(_WIN32)
#include "lldb/Host/windows/windows.h"
#include <winsock2.h>
#endif
#include "Plugins/Platform/gdb-server/PlatformRemoteGDBServer.h"
#include "Plugins/TypeSystem/Clang/TypeSystemClang.h"
#include "lldb/Breakpoint/BreakpointLocation.h"
#include "lldb/Breakpoint/BreakpointSite.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Expression/DiagnosticManager.h"
#include "lldb/Expression/FunctionCaller.h"
#include "lldb/Expression/UserExpression.h"
#include "lldb/Expression/UtilityFunction.h"
#include "lldb/Host/HostInfo.h"
#include "lldb/Target/DynamicLoader.h"
#include "lldb/Target/Process.h"
#include "lldb/Utility/Status.h"
#include "llvm/ADT/ScopeExit.h"
#include "llvm/Support/ConvertUTF.h"
using namespace lldb;
using namespace lldb_private;
LLDB_PLUGIN_DEFINE(PlatformWindows)
static uint32_t g_initialize_count = 0;
PlatformSP PlatformWindows::CreateInstance(bool force,
const lldb_private::ArchSpec *arch) {
// The only time we create an instance is when we are creating a remote
// windows platform
const bool is_host = false;
bool create = force;
if (!create && arch && arch->IsValid()) {
const llvm::Triple &triple = arch->GetTriple();
switch (triple.getVendor()) {
case llvm::Triple::PC:
create = true;
break;
case llvm::Triple::UnknownVendor:
create = !arch->TripleVendorWasSpecified();
break;
default:
break;
}
if (create) {
switch (triple.getOS()) {
case llvm::Triple::Win32:
break;
case llvm::Triple::UnknownOS:
create = arch->TripleOSWasSpecified();
break;
default:
create = false;
break;
}
}
}
if (create)
return PlatformSP(new PlatformWindows(is_host));
return PlatformSP();
}
llvm::StringRef PlatformWindows::GetPluginDescriptionStatic(bool is_host) {
return is_host ? "Local Windows user platform plug-in."
: "Remote Windows user platform plug-in.";
}
void PlatformWindows::Initialize() {
Platform::Initialize();
if (g_initialize_count++ == 0) {
#if defined(_WIN32)
// Force a host flag to true for the default platform object.
PlatformSP default_platform_sp(new PlatformWindows(true));
default_platform_sp->SetSystemArchitecture(HostInfo::GetArchitecture());
Platform::SetHostPlatform(default_platform_sp);
#endif
PluginManager::RegisterPlugin(
PlatformWindows::GetPluginNameStatic(false),
PlatformWindows::GetPluginDescriptionStatic(false),
PlatformWindows::CreateInstance);
}
}
void PlatformWindows::Terminate() {
if (g_initialize_count > 0) {
if (--g_initialize_count == 0) {
PluginManager::UnregisterPlugin(PlatformWindows::CreateInstance);
}
}
Platform::Terminate();
}
/// Default Constructor
PlatformWindows::PlatformWindows(bool is_host) : RemoteAwarePlatform(is_host) {
const auto &AddArch = [&](const ArchSpec &spec) {
if (llvm::any_of(m_supported_architectures, [spec](const ArchSpec &rhs) {
return spec.IsExactMatch(rhs);
}))
return;
if (spec.IsValid())
m_supported_architectures.push_back(spec);
};
AddArch(HostInfo::GetArchitecture(HostInfo::eArchKindDefault));
AddArch(HostInfo::GetArchitecture(HostInfo::eArchKind32));
AddArch(HostInfo::GetArchitecture(HostInfo::eArchKind64));
}
Status PlatformWindows::ConnectRemote(Args &args) {
Status error;
if (IsHost()) {
error.SetErrorStringWithFormatv(
"can't connect to the host platform '{0}', always connected",
GetPluginName());
} else {
if (!m_remote_platform_sp)
m_remote_platform_sp =
platform_gdb_server::PlatformRemoteGDBServer::CreateInstance(
/*force=*/true, nullptr);
if (m_remote_platform_sp) {
if (error.Success()) {
if (m_remote_platform_sp) {
error = m_remote_platform_sp->ConnectRemote(args);
} else {
error.SetErrorString(
"\"platform connect\" takes a single argument: <connect-url>");
}
}
} else
error.SetErrorString("failed to create a 'remote-gdb-server' platform");
if (error.Fail())
m_remote_platform_sp.reset();
}
return error;
}
uint32_t PlatformWindows::DoLoadImage(Process *process,
const FileSpec &remote_file,
const std::vector<std::string> *paths,
Status &error, FileSpec *loaded_image) {
DiagnosticManager diagnostics;
if (loaded_image)
loaded_image->Clear();
ThreadSP thread = process->GetThreadList().GetExpressionExecutionThread();
if (!thread) {
error.SetErrorString("LoadLibrary error: no thread available to invoke LoadLibrary");
return LLDB_INVALID_IMAGE_TOKEN;
}
ExecutionContext context;
thread->CalculateExecutionContext(context);
Status status;
UtilityFunction *loader =
process->GetLoadImageUtilityFunction(this, [&]() -> std::unique_ptr<UtilityFunction> {
return MakeLoadImageUtilityFunction(context, status);
});
if (loader == nullptr)
return LLDB_INVALID_IMAGE_TOKEN;
FunctionCaller *invocation = loader->GetFunctionCaller();
if (!invocation) {
error.SetErrorString("LoadLibrary error: could not get function caller");
return LLDB_INVALID_IMAGE_TOKEN;
}
/* Convert name */
llvm::SmallVector<llvm::UTF16, 261> name;
if (!llvm::convertUTF8ToUTF16String(remote_file.GetPath(), name)) {
error.SetErrorString("LoadLibrary error: could not convert path to UCS2");
return LLDB_INVALID_IMAGE_TOKEN;
}
name.emplace_back(L'\0');
/* Inject name paramter into inferior */
lldb::addr_t injected_name =
process->AllocateMemory(name.size() * sizeof(llvm::UTF16),
ePermissionsReadable | ePermissionsWritable,
status);
if (injected_name == LLDB_INVALID_ADDRESS) {
error.SetErrorStringWithFormat("LoadLibrary error: unable to allocate memory for name: %s",
status.AsCString());
return LLDB_INVALID_IMAGE_TOKEN;
}
auto name_cleanup = llvm::make_scope_exit([process, injected_name]() {
process->DeallocateMemory(injected_name);
});
process->WriteMemory(injected_name, name.data(),
name.size() * sizeof(llvm::UTF16), status);
if (status.Fail()) {
error.SetErrorStringWithFormat("LoadLibrary error: unable to write name: %s",
status.AsCString());
return LLDB_INVALID_IMAGE_TOKEN;
}
/* Inject paths parameter into inferior */
lldb::addr_t injected_paths{0x0};
llvm::Optional<llvm::detail::scope_exit<std::function<void()>>> paths_cleanup;
if (paths) {
llvm::SmallVector<llvm::UTF16, 261> search_paths;
for (const auto &path : *paths) {
if (path.empty())
continue;
llvm::SmallVector<llvm::UTF16, 261> buffer;
if (!llvm::convertUTF8ToUTF16String(path, buffer))
continue;
search_paths.append(std::begin(buffer), std::end(buffer));
search_paths.emplace_back(L'\0');
}
search_paths.emplace_back(L'\0');
injected_paths =
process->AllocateMemory(search_paths.size() * sizeof(llvm::UTF16),
ePermissionsReadable | ePermissionsWritable,
status);
if (injected_paths == LLDB_INVALID_ADDRESS) {
error.SetErrorStringWithFormat("LoadLibrary error: unable to allocate memory for paths: %s",
status.AsCString());
return LLDB_INVALID_IMAGE_TOKEN;
}
paths_cleanup.emplace([process, injected_paths]() {
process->DeallocateMemory(injected_paths);
});
process->WriteMemory(injected_paths, search_paths.data(),
search_paths.size() * sizeof(llvm::UTF16), status);
if (status.Fail()) {
error.SetErrorStringWithFormat("LoadLibrary error: unable to write paths: %s",
status.AsCString());
return LLDB_INVALID_IMAGE_TOKEN;
}
}
/* Inject wszModulePath into inferior */
// FIXME(compnerd) should do something better for the length?
// GetModuleFileNameA is likely limited to PATH_MAX rather than the NT path
// limit.
unsigned injected_length = 261;
lldb::addr_t injected_module_path =
process->AllocateMemory(injected_length + 1,
ePermissionsReadable | ePermissionsWritable,
status);
if (injected_module_path == LLDB_INVALID_ADDRESS) {
error.SetErrorStringWithFormat("LoadLibrary error: unable to allocate memory for module location: %s",
status.AsCString());
return LLDB_INVALID_IMAGE_TOKEN;
}
auto injected_module_path_cleanup =
llvm::make_scope_exit([process, injected_module_path]() {
process->DeallocateMemory(injected_module_path);
});
/* Inject __lldb_LoadLibraryResult into inferior */
const uint32_t word_size = process->GetAddressByteSize();
lldb::addr_t injected_result =
process->AllocateMemory(3 * word_size,
ePermissionsReadable | ePermissionsWritable,
status);
if (status.Fail()) {
error.SetErrorStringWithFormat("LoadLibrary error: could not allocate memory for result: %s",
status.AsCString());
return LLDB_INVALID_IMAGE_TOKEN;
}
auto result_cleanup = llvm::make_scope_exit([process, injected_result]() {
process->DeallocateMemory(injected_result);
});
process->WritePointerToMemory(injected_result + word_size,
injected_module_path, status);
if (status.Fail()) {
error.SetErrorStringWithFormat("LoadLibrary error: could not initialize result: %s",
status.AsCString());
return LLDB_INVALID_IMAGE_TOKEN;
}
// XXX(compnerd) should we use the compiler to get the sizeof(unsigned)?
process->WriteScalarToMemory(injected_result + 2 * word_size,
Scalar{injected_length}, sizeof(unsigned),
status);
if (status.Fail()) {
error.SetErrorStringWithFormat("LoadLibrary error: could not initialize result: %s",
status.AsCString());
return LLDB_INVALID_IMAGE_TOKEN;
}
/* Setup Formal Parameters */
ValueList parameters = invocation->GetArgumentValues();
parameters.GetValueAtIndex(0)->GetScalar() = injected_name;
parameters.GetValueAtIndex(1)->GetScalar() = injected_paths;
parameters.GetValueAtIndex(2)->GetScalar() = injected_result;
lldb::addr_t injected_parameters = LLDB_INVALID_ADDRESS;
diagnostics.Clear();
if (!invocation->WriteFunctionArguments(context, injected_parameters,
parameters, diagnostics)) {
error.SetErrorStringWithFormat("LoadLibrary error: unable to write function parameters: %s",
diagnostics.GetString().c_str());
return LLDB_INVALID_IMAGE_TOKEN;
}
auto parameter_cleanup = llvm::make_scope_exit([invocation, &context, injected_parameters]() {
invocation->DeallocateFunctionResults(context, injected_parameters);
});
TypeSystemClang *ast =
ScratchTypeSystemClang::GetForTarget(process->GetTarget());
if (!ast) {
error.SetErrorString("LoadLibrary error: unable to get (clang) type system");
return LLDB_INVALID_IMAGE_TOKEN;
}
/* Setup Return Type */
CompilerType VoidPtrTy = ast->GetBasicType(eBasicTypeVoid).GetPointerType();
Value value;
value.SetCompilerType(VoidPtrTy);
/* Invoke expression */
EvaluateExpressionOptions options;
options.SetExecutionPolicy(eExecutionPolicyAlways);
options.SetLanguage(eLanguageTypeC_plus_plus);
options.SetIgnoreBreakpoints(true);
options.SetUnwindOnError(true);
// LoadLibraryEx{A,W}/FreeLibrary cannot raise exceptions which we can handle.
// They may potentially throw SEH exceptions which we do not know how to
// handle currently.
options.SetTrapExceptions(false);
options.SetTimeout(process->GetUtilityExpressionTimeout());
options.SetIsForUtilityExpr(true);
ExpressionResults result =
invocation->ExecuteFunction(context, &injected_parameters, options,
diagnostics, value);
if (result != eExpressionCompleted) {
error.SetErrorStringWithFormat("LoadLibrary error: failed to execute LoadLibrary helper: %s",
diagnostics.GetString().c_str());
return LLDB_INVALID_IMAGE_TOKEN;
}
/* Read result */
lldb::addr_t token = process->ReadPointerFromMemory(injected_result, status);
if (status.Fail()) {
error.SetErrorStringWithFormat("LoadLibrary error: could not read the result: %s",
status.AsCString());
return LLDB_INVALID_IMAGE_TOKEN;
}
if (!token) {
// XXX(compnerd) should we use the compiler to get the sizeof(unsigned)?
uint64_t error_code =
process->ReadUnsignedIntegerFromMemory(injected_result + 2 * word_size + sizeof(unsigned),
word_size, 0, status);
if (status.Fail()) {
error.SetErrorStringWithFormat("LoadLibrary error: could not read error status: %s",
status.AsCString());
return LLDB_INVALID_IMAGE_TOKEN;
}
error.SetErrorStringWithFormat("LoadLibrary Error: %" PRIu64, error_code);
return LLDB_INVALID_IMAGE_TOKEN;
}
std::string module_path;
process->ReadCStringFromMemory(injected_module_path, module_path, status);
if (status.Fail()) {
error.SetErrorStringWithFormat("LoadLibrary error: could not read module path: %s",
status.AsCString());
return LLDB_INVALID_IMAGE_TOKEN;
}
if (loaded_image)
loaded_image->SetFile(module_path, llvm::sys::path::Style::native);
return process->AddImageToken(token);
}
Status PlatformWindows::UnloadImage(Process *process, uint32_t image_token) {
const addr_t address = process->GetImagePtrFromToken(image_token);
if (address == LLDB_INVALID_ADDRESS)
return Status("invalid image token");
StreamString expression;
expression.Printf("FreeLibrary((HMODULE)0x%" PRIx64 ")", address);
ValueObjectSP value;
Status result =
EvaluateLoaderExpression(process, expression.GetData(), value);
if (result.Fail())
return result;
if (value->GetError().Fail())
return value->GetError();
Scalar scalar;
if (value->ResolveValue(scalar)) {
if (scalar.UInt(1))
return Status("expression failed: \"%s\"", expression.GetData());
process->ResetImageToken(image_token);
}
return Status();
}
Status PlatformWindows::DisconnectRemote() {
Status error;
if (IsHost()) {
error.SetErrorStringWithFormatv(
"can't disconnect from the host platform '{0}', always connected",
GetPluginName());
} else {
if (m_remote_platform_sp)
error = m_remote_platform_sp->DisconnectRemote();
else
error.SetErrorString("the platform is not currently connected");
}
return error;
}
ProcessSP PlatformWindows::DebugProcess(ProcessLaunchInfo &launch_info,
Debugger &debugger, Target &target,
Status &error) {
// Windows has special considerations that must be followed when launching or
// attaching to a process. The key requirement is that when launching or
// attaching to a process, you must do it from the same the thread that will
// go into a permanent loop which will then receive debug events from the
// process. In particular, this means we can't use any of LLDB's generic
// mechanisms to do it for us, because it doesn't have the special knowledge
// required for setting up the background thread or passing the right flags.
//
// Another problem is that that LLDB's standard model for debugging a process
// is to first launch it, have it stop at the entry point, and then attach to
// it. In Windows this doesn't quite work, you have to specify as an
// argument to CreateProcess() that you're going to debug the process. So we
// override DebugProcess here to handle this. Launch operations go directly
// to the process plugin, and attach operations almost go directly to the
// process plugin (but we hijack the events first). In essence, we
// encapsulate all the logic of Launching and Attaching in the process
// plugin, and PlatformWindows::DebugProcess is just a pass-through to get to
// the process plugin.
if (IsRemote()) {
if (m_remote_platform_sp)
return m_remote_platform_sp->DebugProcess(launch_info, debugger, target,
error);
else
error.SetErrorString("the platform is not currently connected");
}
if (launch_info.GetProcessID() != LLDB_INVALID_PROCESS_ID) {
// This is a process attach. Don't need to launch anything.
ProcessAttachInfo attach_info(launch_info);
return Attach(attach_info, debugger, &target, error);
}
ProcessSP process_sp =
target.CreateProcess(launch_info.GetListener(),
launch_info.GetProcessPluginName(), nullptr, false);
process_sp->HijackProcessEvents(launch_info.GetHijackListener());
// We need to launch and attach to the process.
launch_info.GetFlags().Set(eLaunchFlagDebug);
if (process_sp)
error = process_sp->Launch(launch_info);
return process_sp;
}
lldb::ProcessSP PlatformWindows::Attach(ProcessAttachInfo &attach_info,
Debugger &debugger, Target *target,
Status &error) {
error.Clear();
lldb::ProcessSP process_sp;
if (!IsHost()) {
if (m_remote_platform_sp)
process_sp =
m_remote_platform_sp->Attach(attach_info, debugger, target, error);
else
error.SetErrorString("the platform is not currently connected");
return process_sp;
}
if (target == nullptr) {
TargetSP new_target_sp;
FileSpec emptyFileSpec;
ArchSpec emptyArchSpec;
error = debugger.GetTargetList().CreateTarget(
debugger, "", "", eLoadDependentsNo, nullptr, new_target_sp);
target = new_target_sp.get();
}
if (!target || error.Fail())
return process_sp;
const char *plugin_name = attach_info.GetProcessPluginName();
process_sp = target->CreateProcess(
attach_info.GetListenerForProcess(debugger), plugin_name, nullptr, false);
process_sp->HijackProcessEvents(attach_info.GetHijackListener());
if (process_sp)
error = process_sp->Attach(attach_info);
return process_sp;
}
void PlatformWindows::GetStatus(Stream &strm) {
Platform::GetStatus(strm);
#ifdef _WIN32
llvm::VersionTuple version = HostInfo::GetOSVersion();
strm << " Host: Windows " << version.getAsString() << '\n';
#endif
}
bool PlatformWindows::CanDebugProcess() { return true; }
ConstString PlatformWindows::GetFullNameForDylib(ConstString basename) {
if (basename.IsEmpty())
return basename;
StreamString stream;
stream.Printf("%s.dll", basename.GetCString());
return ConstString(stream.GetString());
}
size_t
PlatformWindows::GetSoftwareBreakpointTrapOpcode(Target &target,
BreakpointSite *bp_site) {
ArchSpec arch = target.GetArchitecture();
assert(arch.IsValid());
const uint8_t *trap_opcode = nullptr;
size_t trap_opcode_size = 0;
switch (arch.GetMachine()) {
case llvm::Triple::aarch64: {
static const uint8_t g_aarch64_opcode[] = {0x00, 0x00, 0x3e, 0xd4}; // brk #0xf000
trap_opcode = g_aarch64_opcode;
trap_opcode_size = sizeof(g_aarch64_opcode);
if (bp_site->SetTrapOpcode(trap_opcode, trap_opcode_size))
return trap_opcode_size;
return 0;
} break;
case llvm::Triple::arm:
case llvm::Triple::thumb: {
static const uint8_t g_thumb_opcode[] = {0xfe, 0xde}; // udf #0xfe
trap_opcode = g_thumb_opcode;
trap_opcode_size = sizeof(g_thumb_opcode);
if (bp_site->SetTrapOpcode(trap_opcode, trap_opcode_size))
return trap_opcode_size;
return 0;
} break;
default:
return Platform::GetSoftwareBreakpointTrapOpcode(target, bp_site);
}
}
std::unique_ptr<UtilityFunction>
PlatformWindows::MakeLoadImageUtilityFunction(ExecutionContext &context,
Status &status) {
// FIXME(compnerd) `-fdeclspec` is not passed to the clang instance?
static constexpr const char kLoaderDecls[] = R"(
extern "C" {
// errhandlingapi.h
// `LOAD_LIBRARY_SEARCH_APPLICATION_DIR | LOAD_LIBRARY_SEARCH_SYSTEM32 | LOAD_LIBRARY_SEARCH_USER_DIRS`
//
// Directories in the standard search path are not searched. This value cannot
// be combined with `LOAD_WITH_ALTERED_SEARCH_PATH`.
//
// This value represents the recommended maximum number of directories an
// application should include in its DLL search path.
#define LOAD_LIBRARY_SEARCH_DEFAULT_DIRS 0x00001000
// WINBASEAPI DWORD WINAPI GetLastError(VOID);
/* __declspec(dllimport) */ uint32_t __stdcall GetLastError();
// libloaderapi.h
// WINBASEAPI DLL_DIRECTORY_COOKIE WINAPI AddDllDirectory(LPCWSTR);
/* __declspec(dllimport) */ void * __stdcall AddDllDirectory(const wchar_t *);
// WINBASEAPI BOOL WINAPI FreeModule(HMODULE);
/* __declspec(dllimport) */ int __stdcall FreeModule(void *hLibModule);
// WINBASEAPI DWORD WINAPI GetModuleFileNameA(HMODULE hModule, LPSTR lpFilename, DWORD nSize);
/* __declspec(dllimport) */ uint32_t GetModuleFileNameA(void *, char *, uint32_t);
// WINBASEAPI HMODULE WINAPI LoadLibraryExW(LPCWSTR, HANDLE, DWORD);
/* __declspec(dllimport) */ void * __stdcall LoadLibraryExW(const wchar_t *, void *, uint32_t);
// corecrt_wstring.h
// _ACRTIMP size_t __cdecl wcslen(wchar_t const *_String);
/* __declspec(dllimport) */ size_t __cdecl wcslen(const wchar_t *);
// lldb specific code
struct __lldb_LoadLibraryResult {
void *ImageBase;
char *ModulePath;
unsigned Length;
unsigned ErrorCode;
};
_Static_assert(sizeof(struct __lldb_LoadLibraryResult) <= 3 * sizeof(void *),
"__lldb_LoadLibraryResult size mismatch");
void * __lldb_LoadLibraryHelper(const wchar_t *name, const wchar_t *paths,
__lldb_LoadLibraryResult *result) {
for (const wchar_t *path = paths; path && *path; ) {
(void)AddDllDirectory(path);
path += wcslen(path) + 1;
}
result->ImageBase = LoadLibraryExW(name, nullptr,
LOAD_LIBRARY_SEARCH_DEFAULT_DIRS);
if (result->ImageBase == nullptr)
result->ErrorCode = GetLastError();
else
result->Length = GetModuleFileNameA(result->ImageBase, result->ModulePath,
result->Length);
return result->ImageBase;
}
}
)";
static constexpr const char kName[] = "__lldb_LoadLibraryHelper";
ProcessSP process = context.GetProcessSP();
Target &target = process->GetTarget();
auto function = target.CreateUtilityFunction(std::string{kLoaderDecls}, kName,
eLanguageTypeC_plus_plus,
context);
if (!function) {
std::string error = llvm::toString(function.takeError());
status.SetErrorStringWithFormat("LoadLibrary error: could not create utility function: %s",
error.c_str());
return nullptr;
}
TypeSystemClang *ast = ScratchTypeSystemClang::GetForTarget(target);
if (!ast)
return nullptr;
CompilerType VoidPtrTy = ast->GetBasicType(eBasicTypeVoid).GetPointerType();
CompilerType WCharPtrTy = ast->GetBasicType(eBasicTypeWChar).GetPointerType();
ValueList parameters;
Value value;
value.SetValueType(Value::ValueType::Scalar);
value.SetCompilerType(WCharPtrTy);
parameters.PushValue(value); // name
parameters.PushValue(value); // paths
value.SetCompilerType(VoidPtrTy);
parameters.PushValue(value); // result
Status error;
std::unique_ptr<UtilityFunction> utility{std::move(*function)};
utility->MakeFunctionCaller(VoidPtrTy, parameters, context.GetThreadSP(),
error);
if (error.Fail()) {
status.SetErrorStringWithFormat("LoadLibrary error: could not create function caller: %s",
error.AsCString());
return nullptr;
}
if (!utility->GetFunctionCaller()) {
status.SetErrorString("LoadLibrary error: could not get function caller");
return nullptr;
}
return utility;
}
Status PlatformWindows::EvaluateLoaderExpression(Process *process,
const char *expression,
ValueObjectSP &value) {
// FIXME(compnerd) `-fdeclspec` is not passed to the clang instance?
static constexpr const char kLoaderDecls[] = R"(
extern "C" {
// libloaderapi.h
// WINBASEAPI DLL_DIRECTORY_COOKIE WINAPI AddDllDirectory(LPCWSTR);
/* __declspec(dllimport) */ void * __stdcall AddDllDirectory(const wchar_t *);
// WINBASEAPI BOOL WINAPI FreeModule(HMODULE);
/* __declspec(dllimport) */ int __stdcall FreeModule(void *);
// WINBASEAPI DWORD WINAPI GetModuleFileNameA(HMODULE, LPSTR, DWORD);
/* __declspec(dllimport) */ uint32_t GetModuleFileNameA(void *, char *, uint32_t);
// WINBASEAPI HMODULE WINAPI LoadLibraryExW(LPCWSTR, HANDLE, DWORD);
/* __declspec(dllimport) */ void * __stdcall LoadLibraryExW(const wchar_t *, void *, uint32_t);
}
)";
if (DynamicLoader *loader = process->GetDynamicLoader()) {
Status result = loader->CanLoadImage();
if (result.Fail())
return result;
}
ThreadSP thread = process->GetThreadList().GetExpressionExecutionThread();
if (!thread)
return Status("selected thread is invalid");
StackFrameSP frame = thread->GetStackFrameAtIndex(0);
if (!frame)
return Status("frame 0 is invalid");
ExecutionContext context;
frame->CalculateExecutionContext(context);
EvaluateExpressionOptions options;
options.SetUnwindOnError(true);
options.SetIgnoreBreakpoints(true);
options.SetExecutionPolicy(eExecutionPolicyAlways);
options.SetLanguage(eLanguageTypeC_plus_plus);
// LoadLibraryEx{A,W}/FreeLibrary cannot raise exceptions which we can handle.
// They may potentially throw SEH exceptions which we do not know how to
// handle currently.
options.SetTrapExceptions(false);
options.SetTimeout(process->GetUtilityExpressionTimeout());
Status error;
ExpressionResults result = UserExpression::Evaluate(
context, options, expression, kLoaderDecls, value, error);
if (result != eExpressionCompleted)
return error;
if (value->GetError().Fail())
return value->GetError();
return Status();
}
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