1	//===-- ClangExpressionParser.cpp -----------------------------------------===//
2	//
3	// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4	// See https://llvm.org/LICENSE.txt for license information.
5	// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6	//
7	//===----------------------------------------------------------------------===//
8
9	#include "clang/AST/ASTContext.h"
10	#include "clang/AST/ASTDiagnostic.h"
11	#include "clang/AST/ExternalASTSource.h"
12	#include "clang/AST/PrettyPrinter.h"
13	#include "clang/Basic/Builtins.h"
14	#include "clang/Basic/DarwinSDKInfo.h"
15	#include "clang/Basic/DiagnosticIDs.h"
16	#include "clang/Basic/IdentifierTable.h"
17	#include "clang/Basic/SourceLocation.h"
18	#include "clang/Basic/TargetInfo.h"
19	#include "clang/Basic/Version.h"
20	#include "clang/CodeGen/CodeGenAction.h"
21	#include "clang/CodeGen/ModuleBuilder.h"
22	#include "clang/Edit/Commit.h"
23	#include "clang/Edit/EditedSource.h"
24	#include "clang/Edit/EditsReceiver.h"
25	#include "clang/Frontend/CompilerInstance.h"
26	#include "clang/Frontend/CompilerInvocation.h"
27	#include "clang/Frontend/FrontendActions.h"
28	#include "clang/Frontend/FrontendDiagnostic.h"
29	#include "clang/Frontend/FrontendPluginRegistry.h"
30	#include "clang/Frontend/TextDiagnostic.h"
31	#include "clang/Frontend/TextDiagnosticBuffer.h"
32	#include "clang/Frontend/TextDiagnosticPrinter.h"
33	#include "clang/Lex/Preprocessor.h"
34	#include "clang/Parse/ParseAST.h"
35	#include "clang/Rewrite/Core/Rewriter.h"
36	#include "clang/Rewrite/Frontend/FrontendActions.h"
37	#include "clang/Sema/CodeCompleteConsumer.h"
38	#include "clang/Sema/Sema.h"
39	#include "clang/Sema/SemaConsumer.h"
40
41	#include "llvm/ADT/StringRef.h"
42	#include "llvm/ExecutionEngine/ExecutionEngine.h"
43	#include "llvm/Support/CrashRecoveryContext.h"
44	#include "llvm/Support/Debug.h"
45	#include "llvm/Support/Error.h"
46	#include "llvm/Support/FileSystem.h"
47	#include "llvm/Support/TargetSelect.h"
48	#include "llvm/TargetParser/Triple.h"
49
50	#include "llvm/IR/LLVMContext.h"
51	#include "llvm/IR/Module.h"
52	#include "llvm/Support/DynamicLibrary.h"
53	#include "llvm/Support/ErrorHandling.h"
54	#include "llvm/Support/MemoryBuffer.h"
55	#include "llvm/Support/Signals.h"
56	#include "llvm/TargetParser/Host.h"
57
58	#include "ClangDiagnostic.h"
59	#include "ClangExpressionParser.h"
60	#include "ClangUserExpression.h"
61
62	#include "ASTUtils.h"
63	#include "ClangASTSource.h"
64	#include "ClangExpressionDeclMap.h"
65	#include "ClangExpressionHelper.h"
66	#include "ClangHost.h"
67	#include "ClangModulesDeclVendor.h"
68	#include "ClangPersistentVariables.h"
69	#include "IRDynamicChecks.h"
70	#include "IRForTarget.h"
71	#include "ModuleDependencyCollector.h"
72
73	#include "Plugins/TypeSystem/Clang/TypeSystemClang.h"
74	#include "lldb/Core/Debugger.h"
75	#include "lldb/Core/Disassembler.h"
76	#include "lldb/Core/Module.h"
77	#include "lldb/Expression/IRExecutionUnit.h"
78	#include "lldb/Expression/IRInterpreter.h"
79	#include "lldb/Host/File.h"
80	#include "lldb/Host/HostInfo.h"
81	#include "lldb/Symbol/SymbolVendor.h"
82	#include "lldb/Target/ExecutionContext.h"
83	#include "lldb/Target/ExecutionContextScope.h"
84	#include "lldb/Target/Language.h"
85	#include "lldb/Target/Process.h"
86	#include "lldb/Target/Target.h"
87	#include "lldb/Target/ThreadPlanCallFunction.h"
88	#include "lldb/Utility/DataBufferHeap.h"
89	#include "lldb/Utility/LLDBAssert.h"
90	#include "lldb/Utility/LLDBLog.h"
91	#include "lldb/Utility/Log.h"
92	#include "lldb/Utility/Stream.h"
93	#include "lldb/Utility/StreamString.h"
94	#include "lldb/Utility/StringList.h"
95
96	#include "Plugins/LanguageRuntime/ObjC/ObjCLanguageRuntime.h"
97	#include "Plugins/Platform/MacOSX/PlatformDarwin.h"
98	#include "lldb/Utility/XcodeSDK.h"
99
100	#include <cctype>
101	#include <memory>
102	#include <optional>
103
104	using namespace clang;
105	using namespace llvm;
106	using namespace lldb_private;
107
108	//===----------------------------------------------------------------------===//
109	// Utility Methods for Clang
110	//===----------------------------------------------------------------------===//
111
112	class ClangExpressionParser::LLDBPreprocessorCallbacks : public PPCallbacks {
113	ClangModulesDeclVendor &m_decl_vendor;
114	ClangPersistentVariables &m_persistent_vars;
115	clang::SourceManager &m_source_mgr;
116	StreamString m_error_stream;
117	bool m_has_errors = false;
118
119	public:
120	LLDBPreprocessorCallbacks(ClangModulesDeclVendor &decl_vendor,
121	ClangPersistentVariables &persistent_vars,
122	clang::SourceManager &source_mgr)
123	: m_decl_vendor(decl_vendor), m_persistent_vars(persistent_vars),
124	m_source_mgr(source_mgr) {}
125
126	void moduleImport(SourceLocation import_location, clang::ModuleIdPath path,
127	const clang::Module * /*null*/) override {
128	// Ignore modules that are imported in the wrapper code as these are not
129	// loaded by the user.
130	llvm::StringRef filename =
131	m_source_mgr.getPresumedLoc(Loc: import_location).getFilename();
132	if (filename == ClangExpressionSourceCode::g_prefix_file_name)
133	return;
134
135	SourceModule module;
136
137	for (const IdentifierLoc &component : path)
138	module.path.push_back(
139	x: ConstString(component.getIdentifierInfo()->getName()));
140
141	StreamString error_stream;
142
143	ClangModulesDeclVendor::ModuleVector exported_modules;
144	if (!m_decl_vendor.AddModule(module, exported_modules: &exported_modules, error_stream&: m_error_stream))
145	m_has_errors = true;
146
147	for (ClangModulesDeclVendor::ModuleID module : exported_modules)
148	m_persistent_vars.AddHandLoadedClangModule(module);
149	}
150
151	bool hasErrors() { return m_has_errors; }
152
153	llvm::StringRef getErrorString() { return m_error_stream.GetString(); }
154	};
155
156	static void AddAllFixIts(ClangDiagnostic *diag, const clang::Diagnostic &Info) {
157	for (auto &fix_it : Info.getFixItHints()) {
158	if (fix_it.isNull())
159	continue;
160	diag->AddFixitHint(fixit: fix_it);
161	}
162	}
163
164	class ClangDiagnosticManagerAdapter : public clang::DiagnosticConsumer {
165	public:
166	ClangDiagnosticManagerAdapter(DiagnosticOptions &opts, StringRef filename)
167	: m_options(opts), m_filename(filename) {
168	m_options.ShowPresumedLoc = true;
169	m_options.ShowLevel = false;
170	m_os = std::make_shared<llvm::raw_string_ostream>(args&: m_output);
171	m_passthrough =
172	std::make_shared<clang::TextDiagnosticPrinter>(args&: *m_os, args&: m_options);
173	}
174
175	void ResetManager(DiagnosticManager *manager = nullptr) {
176	m_manager = manager;
177	}
178
179	/// Returns the last error ClangDiagnostic message that the
180	/// DiagnosticManager received or a nullptr.
181	ClangDiagnostic *MaybeGetLastClangDiag() const {
182	if (m_manager->Diagnostics().empty())
183	return nullptr;
184	auto &diags = m_manager->Diagnostics();
185	for (auto it = diags.rbegin(); it != diags.rend(); it++) {
186	lldb_private::Diagnostic *diag = it->get();
187	if (ClangDiagnostic *clang_diag = dyn_cast<ClangDiagnostic>(Val: diag)) {
188	if (clang_diag->GetSeverity() == lldb::eSeverityWarning)
189	return nullptr;
190	if (clang_diag->GetSeverity() == lldb::eSeverityError)
191	return clang_diag;
192	}
193	}
194	return nullptr;
195	}
196
197	void HandleDiagnostic(DiagnosticsEngine::Level DiagLevel,
198	const clang::Diagnostic &Info) override {
199	if (!m_manager) {
200	// We have no DiagnosticManager before/after parsing but we still could
201	// receive diagnostics (e.g., by the ASTImporter failing to copy decls
202	// when we move the expression result ot the ScratchASTContext). Let's at
203	// least log these diagnostics until we find a way to properly render
204	// them and display them to the user.
205	Log *log = GetLog(mask: LLDBLog::Expressions);
206	if (log) {
207	llvm::SmallVector<char, 32> diag_str;
208	Info.FormatDiagnostic(OutStr&: diag_str);
209	diag_str.push_back(Elt: '\0');
210	const char *plain_diag = diag_str.data();
211	LLDB_LOG(log, "Received diagnostic outside parsing: {0}", plain_diag);
212	}
213	return;
214	}
215
216	// Update error/warning counters.
217	DiagnosticConsumer::HandleDiagnostic(DiagLevel, Info);
218
219	// Render diagnostic message to m_output.
220	m_output.clear();
221	m_passthrough->HandleDiagnostic(Level: DiagLevel, Info);
222
223	DiagnosticDetail detail;
224	switch (DiagLevel) {
225	case DiagnosticsEngine::Level::Fatal:
226	case DiagnosticsEngine::Level::Error:
227	detail.severity = lldb::eSeverityError;
228	break;
229	case DiagnosticsEngine::Level::Warning:
230	detail.severity = lldb::eSeverityWarning;
231	break;
232	case DiagnosticsEngine::Level::Remark:
233	case DiagnosticsEngine::Level::Ignored:
234	detail.severity = lldb::eSeverityInfo;
235	break;
236	case DiagnosticsEngine::Level::Note:
237	// 'note:' diagnostics for errors and warnings can also contain Fix-Its.
238	// We add these Fix-Its to the last error diagnostic to make sure
239	// that we later have all Fix-Its related to an 'error' diagnostic when
240	// we apply them to the user expression.
241	auto *clang_diag = MaybeGetLastClangDiag();
242	// If we don't have a previous diagnostic there is nothing to do.
243	// If the previous diagnostic already has its own Fix-Its, assume that
244	// the 'note:' Fix-It is just an alternative way to solve the issue and
245	// ignore these Fix-Its.
246	if (!clang_diag || clang_diag->HasFixIts())
247	break;
248	// Ignore all Fix-Its that are not associated with an error.
249	if (clang_diag->GetSeverity() != lldb::eSeverityError)
250	break;
251	AddAllFixIts(diag: clang_diag, Info);
252	break;
253	}
254	// ClangDiagnostic messages are expected to have no whitespace/newlines
255	// around them.
256	std::string stripped_output =
257	std::string(llvm::StringRef(m_output).trim());
258
259	// Translate the source location.
260	if (Info.hasSourceManager()) {
261	DiagnosticDetail::SourceLocation loc;
262	clang::SourceManager &sm = Info.getSourceManager();
263	const clang::SourceLocation sloc = Info.getLocation();
264	if (sloc.isValid()) {
265	const clang::FullSourceLoc fsloc(sloc, sm);
266	clang::PresumedLoc PLoc = fsloc.getPresumedLoc(UseLineDirectives: true);
267	StringRef filename =
268	PLoc.isValid() ? PLoc.getFilename() : StringRef{};
269	loc.file = FileSpec(filename);
270	loc.line = fsloc.getSpellingLineNumber();
271	loc.column = fsloc.getSpellingColumnNumber();
272	loc.in_user_input = filename == m_filename;
273	loc.hidden = filename.starts_with(Prefix: "<lldb wrapper ");
274
275	// Find the range of the primary location.
276	for (const auto &range : Info.getRanges()) {
277	if (range.getBegin() == sloc) {
278	// FIXME: This is probably not handling wide characters correctly.
279	unsigned end_col = sm.getSpellingColumnNumber(Loc: range.getEnd());
280	if (end_col > loc.column)
281	loc.length = end_col - loc.column;
282	break;
283	}
284	}
285	detail.source_location = loc;
286	}
287	}
288	llvm::SmallString<0> msg;
289	Info.FormatDiagnostic(OutStr&: msg);
290	detail.message = msg.str();
291	detail.rendered = stripped_output;
292	auto new_diagnostic =
293	std::make_unique<ClangDiagnostic>(args&: detail, args: Info.getID());
294
295	// Don't store away warning fixits, since the compiler doesn't have
296	// enough context in an expression for the warning to be useful.
297	// FIXME: Should we try to filter out FixIts that apply to our generated
298	// code, and not the user's expression?
299	if (detail.severity == lldb::eSeverityError)
300	AddAllFixIts(diag: new_diagnostic.get(), Info);
301
302	m_manager->AddDiagnostic(diagnostic: std::move(new_diagnostic));
303	}
304
305	void BeginSourceFile(const LangOptions &LO, const Preprocessor *PP) override {
306	m_passthrough->BeginSourceFile(LO, PP);
307	}
308
309	void EndSourceFile() override { m_passthrough->EndSourceFile(); }
310
311	private:
312	DiagnosticManager *m_manager = nullptr;
313	DiagnosticOptions m_options;
314	std::shared_ptr<clang::TextDiagnosticPrinter> m_passthrough;
315	/// Output stream of m_passthrough.
316	std::shared_ptr<llvm::raw_string_ostream> m_os;
317	/// Output string filled by m_os.
318	std::string m_output;
319	StringRef m_filename;
320	};
321
322	/// Returns true if the SDK for the specified triple supports
323	/// builtin modules in system headers. This is used to decide
324	/// whether to pass -fbuiltin-headers-in-system-modules to
325	/// the compiler instance when compiling the `std` module.
326	static llvm::Expected<bool>
327	sdkSupportsBuiltinModules(lldb_private::Target &target) {
328	auto arch_spec = target.GetArchitecture();
329	auto const &triple = arch_spec.GetTriple();
330	auto module_sp = target.GetExecutableModule();
331	if (!module_sp)
332	return llvm::createStringError(Fmt: "Executable module not found.");
333
334	// Get SDK path that the target was compiled against.
335	auto platform_sp = target.GetPlatform();
336	if (!platform_sp)
337	return llvm::createStringError(Fmt: "No Platform plugin found on target.");
338
339	auto sdk_or_err = platform_sp->GetSDKPathFromDebugInfo(module&: *module_sp);
340	if (!sdk_or_err)
341	return sdk_or_err.takeError();
342
343	// Use the SDK path from debug-info to find a local matching SDK directory.
344	auto sdk_path_or_err =
345	HostInfo::GetSDKRoot(options: HostInfo::SDKOptions{.XcodeSDKSelection: std::move(sdk_or_err->first)});
346	if (!sdk_path_or_err)
347	return sdk_path_or_err.takeError();
348
349	auto VFS = FileSystem::Instance().GetVirtualFileSystem();
350	if (!VFS)
351	return llvm::createStringError(Fmt: "No virtual filesystem available.");
352
353	// Extract SDK version from the /path/to/some.sdk/SDKSettings.json
354	auto parsed_or_err = clang::parseDarwinSDKInfo(VFS&: *VFS, SDKRootPath: *sdk_path_or_err);
355	if (!parsed_or_err)
356	return parsed_or_err.takeError();
357
358	auto maybe_sdk = *parsed_or_err;
359	if (!maybe_sdk)
360	return llvm::createStringError(Fmt: "Couldn't find Darwin SDK info.");
361
362	return XcodeSDK::SDKSupportsBuiltinModules(target_triple: triple, sdk_version: maybe_sdk->getVersion());
363	}
364
365	static void SetupModuleHeaderPaths(CompilerInstance *compiler,
366	std::vector<std::string> include_directories,
367	lldb::TargetSP target_sp) {
368	Log *log = GetLog(mask: LLDBLog::Expressions);
369
370	HeaderSearchOptions &search_opts = compiler->getHeaderSearchOpts();
371
372	for (const std::string &dir : include_directories) {
373	search_opts.AddPath(Path: dir, Group: frontend::System, IsFramework: false, IgnoreSysRoot: true);
374	LLDB_LOG(log, "Added user include dir: {0}", dir);
375	}
376
377	llvm::SmallString<128> module_cache;
378	const auto &props = ModuleList::GetGlobalModuleListProperties();
379	props.GetClangModulesCachePath().GetPath(path&: module_cache);
380	search_opts.ModuleCachePath = std::string(module_cache.str());
381	LLDB_LOG(log, "Using module cache path: {0}", module_cache.c_str());
382
383	search_opts.ResourceDir = GetClangResourceDir().GetPath();
384
385	search_opts.ImplicitModuleMaps = true;
386	}
387
388	/// Iff the given identifier is a C++ keyword, remove it from the
389	/// identifier table (i.e., make the token a normal identifier).
390	static void RemoveCppKeyword(IdentifierTable &idents, llvm::StringRef token) {
391	// FIXME: 'using' is used by LLDB for local variables, so we can't remove
392	// this keyword without breaking this functionality.
393	if (token == "using")
394	return;
395	// GCC's '__null' is used by LLDB to define NULL/Nil/nil.
396	if (token == "__null")
397	return;
398
399	LangOptions cpp_lang_opts;
400	cpp_lang_opts.CPlusPlus = true;
401	cpp_lang_opts.CPlusPlus11 = true;
402	cpp_lang_opts.CPlusPlus20 = true;
403
404	clang::IdentifierInfo &ii = idents.get(Name: token);
405	// The identifier has to be a C++-exclusive keyword. if not, then there is
406	// nothing to do.
407	if (!ii.isCPlusPlusKeyword(LangOpts: cpp_lang_opts))
408	return;
409	// If the token is already an identifier, then there is nothing to do.
410	if (ii.getTokenID() == clang::tok::identifier)
411	return;
412	// Otherwise the token is a C++ keyword, so turn it back into a normal
413	// identifier.
414	ii.revertTokenIDToIdentifier();
415	}
416
417	/// Remove all C++ keywords from the given identifier table.
418	static void RemoveAllCppKeywords(IdentifierTable &idents) {
419	#define KEYWORD(NAME, FLAGS) RemoveCppKeyword(idents, llvm::StringRef(#NAME));
420	#include "clang/Basic/TokenKinds.def"
421	}
422
423	/// Configures Clang diagnostics for the expression parser.
424	static void SetupDefaultClangDiagnostics(CompilerInstance &compiler) {
425	// List of Clang warning groups that are not useful when parsing expressions.
426	const std::vector<const char *> groupsToIgnore = {
427	"unused-value",
428	"odr",
429	"unused-getter-return-value",
430	};
431	for (const char *group : groupsToIgnore) {
432	compiler.getDiagnostics().setSeverityForGroup(
433	Flavor: clang::diag::Flavor::WarningOrError, Group: group,
434	Map: clang::diag::Severity::Ignored, Loc: SourceLocation());
435	}
436	}
437
438	/// Returns a string representing current ABI.
439	///
440	/// \param[in] target_arch
441	/// The target architecture.
442	///
443	/// \return
444	/// A string representing target ABI for the current architecture.
445	static std::string GetClangTargetABI(const ArchSpec &target_arch) {
446	if (target_arch.IsMIPS()) {
447	switch (target_arch.GetFlags() & ArchSpec::eMIPSABI_mask) {
448	case ArchSpec::eMIPSABI_N64:
449	return "n64";
450	case ArchSpec::eMIPSABI_N32:
451	return "n32";
452	case ArchSpec::eMIPSABI_O32:
453	return "o32";
454	default:
455	return {};
456	}
457	}
458
459	if (target_arch.GetTriple().isRISCV64()) {
460	switch (target_arch.GetFlags() & ArchSpec::eRISCV_float_abi_mask) {
461	case ArchSpec::eRISCV_float_abi_soft:
462	return "lp64";
463	case ArchSpec::eRISCV_float_abi_single:
464	return "lp64f";
465	case ArchSpec::eRISCV_float_abi_double:
466	return "lp64d";
467	case ArchSpec::eRISCV_float_abi_quad:
468	return "lp64q";
469	default:
470	return {};
471	}
472	}
473
474	if (target_arch.GetTriple().isRISCV32()) {
475	switch (target_arch.GetFlags() & ArchSpec::eRISCV_float_abi_mask) {
476	case ArchSpec::eRISCV_float_abi_soft:
477	return "ilp32";
478	case ArchSpec::eRISCV_float_abi_single:
479	return "ilp32f";
480	case ArchSpec::eRISCV_float_abi_double:
481	return "ilp32d";
482	case ArchSpec::eRISCV_float_abi_soft | ArchSpec::eRISCV_rve:
483	return "ilp32e";
484	default:
485	return {};
486	}
487	}
488
489	if (target_arch.GetTriple().isLoongArch64()) {
490	switch (target_arch.GetFlags() & ArchSpec::eLoongArch_abi_mask) {
491	case ArchSpec::eLoongArch_abi_soft_float:
492	return "lp64s";
493	case ArchSpec::eLoongArch_abi_single_float:
494	return "lp64f";
495	case ArchSpec::eLoongArch_abi_double_float:
496	return "lp64d";
497	default:
498	return {};
499	}
500	}
501
502	return {};
503	}
504
505	static void SetupTargetOpts(CompilerInstance &compiler,
506	lldb_private::Target const &target) {
507	Log *log = GetLog(mask: LLDBLog::Expressions);
508	ArchSpec target_arch = target.GetArchitecture();
509
510	const auto target_machine = target_arch.GetMachine();
511	if (target_arch.IsValid()) {
512	std::string triple = target_arch.GetTriple().str();
513	compiler.getTargetOpts().Triple = triple;
514	LLDB_LOGF(log, "Using %s as the target triple",
515	compiler.getTargetOpts().Triple.c_str());
516	} else {
517	// If we get here we don't have a valid target and just have to guess.
518	// Sometimes this will be ok to just use the host target triple (when we
519	// evaluate say "2+3", but other expressions like breakpoint conditions and
520	// other things that _are_ target specific really shouldn't just be using
521	// the host triple. In such a case the language runtime should expose an
522	// overridden options set (3), below.
523	compiler.getTargetOpts().Triple = llvm::sys::getDefaultTargetTriple();
524	LLDB_LOGF(log, "Using default target triple of %s",
525	compiler.getTargetOpts().Triple.c_str());
526	}
527	// Now add some special fixes for known architectures: Any arm32 iOS
528	// environment, but not on arm64
529	if (compiler.getTargetOpts().Triple.find(s: "arm64") == std::string::npos &&
530	compiler.getTargetOpts().Triple.find(s: "arm") != std::string::npos &&
531	compiler.getTargetOpts().Triple.find(s: "ios") != std::string::npos) {
532	compiler.getTargetOpts().ABI = "apcs-gnu";
533	}
534	// Supported subsets of x86
535	if (target_machine == llvm::Triple::x86 ||
536	target_machine == llvm::Triple::x86_64) {
537	compiler.getTargetOpts().FeaturesAsWritten.push_back(x: "+sse");
538	compiler.getTargetOpts().FeaturesAsWritten.push_back(x: "+sse2");
539	}
540
541	// Set the target CPU to generate code for. This will be empty for any CPU
542	// that doesn't really need to make a special
543	// CPU string.
544	compiler.getTargetOpts().CPU = target_arch.GetClangTargetCPU();
545
546	// Set the target ABI
547	if (std::string abi = GetClangTargetABI(target_arch); !abi.empty())
548	compiler.getTargetOpts().ABI = std::move(abi);
549
550	if ((target_machine == llvm::Triple::riscv64 &&
551	compiler.getTargetOpts().ABI == "lp64f") ||
552	(target_machine == llvm::Triple::riscv32 &&
553	compiler.getTargetOpts().ABI == "ilp32f"))
554	compiler.getTargetOpts().FeaturesAsWritten.emplace_back(args: "+f");
555
556	if ((target_machine == llvm::Triple::riscv64 &&
557	compiler.getTargetOpts().ABI == "lp64d") ||
558	(target_machine == llvm::Triple::riscv32 &&
559	compiler.getTargetOpts().ABI == "ilp32d"))
560	compiler.getTargetOpts().FeaturesAsWritten.emplace_back(args: "+d");
561
562	if ((target_machine == llvm::Triple::loongarch64 &&
563	compiler.getTargetOpts().ABI == "lp64f"))
564	compiler.getTargetOpts().FeaturesAsWritten.emplace_back(args: "+f");
565
566	if ((target_machine == llvm::Triple::loongarch64 &&
567	compiler.getTargetOpts().ABI == "lp64d"))
568	compiler.getTargetOpts().FeaturesAsWritten.emplace_back(args: "+d");
569	}
570
571	static void SetupLangOpts(CompilerInstance &compiler,
572	ExecutionContextScope &exe_scope,
573	const Expression &expr) {
574	Log *log = GetLog(mask: LLDBLog::Expressions);
575
576	// If the expression is being evaluated in the context of an existing stack
577	// frame, we introspect to see if the language runtime is available.
578
579	lldb::StackFrameSP frame_sp = exe_scope.CalculateStackFrame();
580	lldb::ProcessSP process_sp = exe_scope.CalculateProcess();
581
582	// Defaults to lldb::eLanguageTypeUnknown.
583	lldb::LanguageType frame_lang = expr.Language().AsLanguageType();
584
585	// Make sure the user hasn't provided a preferred execution language with
586	// `expression --language X -- ...`
587	if (frame_sp && frame_lang == lldb::eLanguageTypeUnknown)
588	frame_lang = frame_sp->GetLanguage().AsLanguageType();
589
590	if (process_sp && frame_lang != lldb::eLanguageTypeUnknown) {
591	LLDB_LOGF(log, "Frame has language of type %s",
592	lldb_private::Language::GetNameForLanguageType(frame_lang));
593	}
594
595	lldb::LanguageType language = expr.Language().AsLanguageType();
596	LangOptions &lang_opts = compiler.getLangOpts();
597
598	// FIXME: should this switch on frame_lang?
599	switch (language) {
600	case lldb::eLanguageTypeC:
601	case lldb::eLanguageTypeC89:
602	case lldb::eLanguageTypeC99:
603	case lldb::eLanguageTypeC11:
604	// FIXME: the following language option is a temporary workaround,
605	// to "ask for C, get C++."
606	// For now, the expression parser must use C++ anytime the language is a C
607	// family language, because the expression parser uses features of C++ to
608	// capture values.
609	lang_opts.CPlusPlus = true;
610	break;
611	case lldb::eLanguageTypeObjC:
612	lang_opts.ObjC = true;
613	// FIXME: the following language option is a temporary workaround,
614	// to "ask for ObjC, get ObjC++" (see comment above).
615	lang_opts.CPlusPlus = true;
616
617	// Clang now sets as default C++14 as the default standard (with
618	// GNU extensions), so we do the same here to avoid mismatches that
619	// cause compiler error when evaluating expressions (e.g. nullptr not found
620	// as it's a C++11 feature). Currently lldb evaluates C++14 as C++11 (see
621	// two lines below) so we decide to be consistent with that, but this could
622	// be re-evaluated in the future.
623	lang_opts.CPlusPlus11 = true;
624	break;
625	case lldb::eLanguageTypeC_plus_plus_20:
626	lang_opts.CPlusPlus20 = true;
627	[[fallthrough]];
628	case lldb::eLanguageTypeC_plus_plus_17:
629	// FIXME: add a separate case for CPlusPlus14. Currently folded into C++17
630	// because C++14 is the default standard for Clang but enabling CPlusPlus14
631	// expression evaluatino doesn't pass the test-suite cleanly.
632	lang_opts.CPlusPlus14 = true;
633	lang_opts.CPlusPlus17 = true;
634	[[fallthrough]];
635	case lldb::eLanguageTypeC_plus_plus:
636	case lldb::eLanguageTypeC_plus_plus_11:
637	case lldb::eLanguageTypeC_plus_plus_14:
638	lang_opts.CPlusPlus11 = true;
639	compiler.getHeaderSearchOpts().UseLibcxx = true;
640	[[fallthrough]];
641	case lldb::eLanguageTypeC_plus_plus_03:
642	lang_opts.CPlusPlus = true;
643	if (process_sp
644	// We're stopped in a frame without debug-info. The user probably
645	// intends to make global queries (which should include Objective-C).
646	&& !(frame_sp && frame_sp->HasDebugInformation()))
647	lang_opts.ObjC =
648	process_sp->GetLanguageRuntime(language: lldb::eLanguageTypeObjC) != nullptr;
649	break;
650	case lldb::eLanguageTypeObjC_plus_plus:
651	case lldb::eLanguageTypeUnknown:
652	default:
653	lang_opts.ObjC = true;
654	lang_opts.CPlusPlus = true;
655	lang_opts.CPlusPlus11 = true;
656	compiler.getHeaderSearchOpts().UseLibcxx = true;
657	break;
658	}
659
660	lang_opts.Bool = true;
661	lang_opts.WChar = true;
662	lang_opts.Blocks = true;
663	lang_opts.DebuggerSupport =
664	true; // Features specifically for debugger clients
665	if (expr.DesiredResultType() == Expression::eResultTypeId)
666	lang_opts.DebuggerCastResultToId = true;
667
668	lang_opts.CharIsSigned =
669	ArchSpec(compiler.getTargetOpts().Triple.c_str()).CharIsSignedByDefault();
670
671	// Spell checking is a nice feature, but it ends up completing a lot of types
672	// that we didn't strictly speaking need to complete. As a result, we spend a
673	// long time parsing and importing debug information.
674	lang_opts.SpellChecking = false;
675
676	if (process_sp && lang_opts.ObjC) {
677	if (auto *runtime = ObjCLanguageRuntime::Get(process&: *process_sp)) {
678	switch (runtime->GetRuntimeVersion()) {
679	case ObjCLanguageRuntime::ObjCRuntimeVersions::eAppleObjC_V2:
680	lang_opts.ObjCRuntime.set(kind: ObjCRuntime::MacOSX, version: VersionTuple(10, 7));
681	break;
682	case ObjCLanguageRuntime::ObjCRuntimeVersions::eObjC_VersionUnknown:
683	case ObjCLanguageRuntime::ObjCRuntimeVersions::eAppleObjC_V1:
684	lang_opts.ObjCRuntime.set(kind: ObjCRuntime::FragileMacOSX,
685	version: VersionTuple(10, 7));
686	break;
687	case ObjCLanguageRuntime::ObjCRuntimeVersions::eGNUstep_libobjc2:
688	lang_opts.ObjCRuntime.set(kind: ObjCRuntime::GNUstep, version: VersionTuple(2, 0));
689	break;
690	}
691
692	if (runtime->HasNewLiteralsAndIndexing())
693	lang_opts.DebuggerObjCLiteral = true;
694	}
695	}
696
697	lang_opts.ThreadsafeStatics = false;
698	lang_opts.AccessControl = false; // Debuggers get universal access
699	lang_opts.DollarIdents = true; // $ indicates a persistent variable name
700	// We enable all builtin functions beside the builtins from libc/libm (e.g.
701	// 'fopen'). Those libc functions are already correctly handled by LLDB, and
702	// additionally enabling them as expandable builtins is breaking Clang.
703	lang_opts.NoBuiltin = true;
704	}
705
706	static void SetupImportStdModuleLangOpts(CompilerInstance &compiler,
707	lldb_private::Target &target) {
708	Log *log = GetLog(mask: LLDBLog::Expressions);
709	LangOptions &lang_opts = compiler.getLangOpts();
710	lang_opts.Modules = true;
711	// We want to implicitly build modules.
712	lang_opts.ImplicitModules = true;
713	// To automatically import all submodules when we import 'std'.
714	lang_opts.ModulesLocalVisibility = false;
715
716	// We use the @import statements, so we need this:
717	// FIXME: We could use the modules-ts, but that currently doesn't work.
718	lang_opts.ObjC = true;
719
720	// Options we need to parse libc++ code successfully.
721	// FIXME: We should ask the driver for the appropriate default flags.
722	lang_opts.GNUMode = true;
723	lang_opts.GNUKeywords = true;
724	lang_opts.CPlusPlus11 = true;
725
726	if (auto supported_or_err = sdkSupportsBuiltinModules(target))
727	lang_opts.BuiltinHeadersInSystemModules = !*supported_or_err;
728	else
729	LLDB_LOG_ERROR(log, supported_or_err.takeError(),
730	"Failed to determine BuiltinHeadersInSystemModules when "
731	"setting up import-std-module: {0}");
732
733	// The Darwin libc expects this macro to be set.
734	lang_opts.GNUCVersion = 40201;
735	}
736
737	//===----------------------------------------------------------------------===//
738	// Implementation of ClangExpressionParser
739	//===----------------------------------------------------------------------===//
740
741	ClangExpressionParser::ClangExpressionParser(
742	ExecutionContextScope *exe_scope, Expression &expr,
743	bool generate_debug_info, std::vector<std::string> include_directories,
744	std::string filename)
745	: ExpressionParser(exe_scope, expr, generate_debug_info), m_compiler(),
746	m_pp_callbacks(nullptr),
747	m_include_directories(std::move(include_directories)),
748	m_filename(std::move(filename)) {
749	Log *log = GetLog(mask: LLDBLog::Expressions);
750
751	// We can't compile expressions without a target. So if the exe_scope is
752	// null or doesn't have a target, then we just need to get out of here. I'll
753	// lldbassert and not make any of the compiler objects since
754	// I can't return errors directly from the constructor. Further calls will
755	// check if the compiler was made and
756	// bag out if it wasn't.
757
758	if (!exe_scope) {
759	lldbassert(exe_scope &&
760	"Can't make an expression parser with a null scope.");
761	return;
762	}
763
764	lldb::TargetSP target_sp;
765	target_sp = exe_scope->CalculateTarget();
766	if (!target_sp) {
767	lldbassert(target_sp.get() &&
768	"Can't make an expression parser with a null target.");
769	return;
770	}
771
772	// 1. Create a new compiler instance.
773	m_compiler = std::make_unique<CompilerInstance>();
774
775	// Make sure clang uses the same VFS as LLDB.
776	m_compiler->createFileManager(VFS: FileSystem::Instance().GetVirtualFileSystem());
777
778	// 2. Configure the compiler with a set of default options that are
779	// appropriate for most situations.
780	SetupTargetOpts(compiler&: *m_compiler, target: *target_sp);
781
782	// 3. Create and install the target on the compiler.
783	m_compiler->createDiagnostics(VFS&: m_compiler->getVirtualFileSystem());
784	// Limit the number of error diagnostics we emit.
785	// A value of 0 means no limit for both LLDB and Clang.
786	m_compiler->getDiagnostics().setErrorLimit(target_sp->GetExprErrorLimit());
787
788	if (auto *target_info = TargetInfo::CreateTargetInfo(
789	Diags&: m_compiler->getDiagnostics(),
790	Opts&: m_compiler->getInvocation().getTargetOpts())) {
791	if (log) {
792	LLDB_LOGF(log, "Target datalayout string: '%s'",
793	target_info->getDataLayoutString());
794	LLDB_LOGF(log, "Target ABI: '%s'", target_info->getABI().str().c_str());
795	LLDB_LOGF(log, "Target vector alignment: %d",
796	target_info->getMaxVectorAlign());
797	}
798	m_compiler->setTarget(target_info);
799	} else {
800	if (log)
801	LLDB_LOGF(log, "Failed to create TargetInfo for '%s'",
802	m_compiler->getTargetOpts().Triple.c_str());
803
804	lldbassert(false && "Failed to create TargetInfo.");
805	}
806
807	// 4. Set language options.
808	SetupLangOpts(compiler&: *m_compiler, exe_scope&: *exe_scope, expr);
809	auto *clang_expr = dyn_cast<ClangUserExpression>(Val: &m_expr);
810	if (clang_expr && clang_expr->DidImportCxxModules()) {
811	LLDB_LOG(log, "Adding lang options for importing C++ modules");
812	SetupImportStdModuleLangOpts(compiler&: *m_compiler, target&: *target_sp);
813	SetupModuleHeaderPaths(compiler: m_compiler.get(), include_directories: m_include_directories, target_sp);
814	}
815
816	// Set CodeGen options
817	m_compiler->getCodeGenOpts().EmitDeclMetadata = true;
818	m_compiler->getCodeGenOpts().InstrumentFunctions = false;
819	m_compiler->getCodeGenOpts().setFramePointer(
820	CodeGenOptions::FramePointerKind::All);
821	if (generate_debug_info)
822	m_compiler->getCodeGenOpts().setDebugInfo(codegenoptions::FullDebugInfo);
823	else
824	m_compiler->getCodeGenOpts().setDebugInfo(codegenoptions::NoDebugInfo);
825
826	// Disable some warnings.
827	SetupDefaultClangDiagnostics(*m_compiler);
828
829	// Inform the target of the language options
830	//
831	// FIXME: We shouldn't need to do this, the target should be immutable once
832	// created. This complexity should be lifted elsewhere.
833	m_compiler->getTarget().adjust(Diags&: m_compiler->getDiagnostics(),
834	Opts&: m_compiler->getLangOpts());
835
836	// 5. Set up the diagnostic buffer for reporting errors
837	auto diag_mgr = new ClangDiagnosticManagerAdapter(
838	m_compiler->getDiagnostics().getDiagnosticOptions(),
839	clang_expr ? clang_expr->GetFilename() : StringRef());
840	m_compiler->getDiagnostics().setClient(client: diag_mgr);
841
842	// 6. Set up the source management objects inside the compiler
843	m_compiler->createFileManager();
844	if (!m_compiler->hasSourceManager())
845	m_compiler->createSourceManager(FileMgr&: m_compiler->getFileManager());
846	m_compiler->createPreprocessor(TUKind: TU_Complete);
847
848	switch (expr.Language().AsLanguageType()) {
849	case lldb::eLanguageTypeC:
850	case lldb::eLanguageTypeC89:
851	case lldb::eLanguageTypeC99:
852	case lldb::eLanguageTypeC11:
853	case lldb::eLanguageTypeObjC:
854	// This is not a C++ expression but we enabled C++ as explained above.
855	// Remove all C++ keywords from the PP so that the user can still use
856	// variables that have C++ keywords as names (e.g. 'int template;').
857	RemoveAllCppKeywords(idents&: m_compiler->getPreprocessor().getIdentifierTable());
858	break;
859	default:
860	break;
861	}
862
863	if (auto *clang_persistent_vars = llvm::cast<ClangPersistentVariables>(
864	Val: target_sp->GetPersistentExpressionStateForLanguage(
865	language: lldb::eLanguageTypeC))) {
866	if (std::shared_ptr<ClangModulesDeclVendor> decl_vendor =
867	clang_persistent_vars->GetClangModulesDeclVendor()) {
868	std::unique_ptr<PPCallbacks> pp_callbacks(
869	new LLDBPreprocessorCallbacks(*decl_vendor, *clang_persistent_vars,
870	m_compiler->getSourceManager()));
871	m_pp_callbacks =
872	static_cast<LLDBPreprocessorCallbacks *>(pp_callbacks.get());
873	m_compiler->getPreprocessor().addPPCallbacks(C: std::move(pp_callbacks));
874	}
875	}
876
877	// 7. Most of this we get from the CompilerInstance, but we also want to give
878	// the context an ExternalASTSource.
879
880	auto &PP = m_compiler->getPreprocessor();
881	auto &builtin_context = PP.getBuiltinInfo();
882	builtin_context.initializeBuiltins(Table&: PP.getIdentifierTable(),
883	LangOpts: m_compiler->getLangOpts());
884
885	m_compiler->createASTContext();
886	clang::ASTContext &ast_context = m_compiler->getASTContext();
887
888	m_ast_context = std::make_shared<TypeSystemClang>(
889	args: "Expression ASTContext for '" + m_filename + "'", args&: ast_context);
890
891	std::string module_name("$__lldb_module");
892
893	m_llvm_context = std::make_unique<LLVMContext>();
894	m_code_generator.reset(p: CreateLLVMCodeGen(
895	Diags&: m_compiler->getDiagnostics(), ModuleName: module_name,
896	FS: &m_compiler->getVirtualFileSystem(), HeaderSearchOpts: m_compiler->getHeaderSearchOpts(),
897	PreprocessorOpts: m_compiler->getPreprocessorOpts(), CGO: m_compiler->getCodeGenOpts(),
898	C&: *m_llvm_context));
899	}
900
901	ClangExpressionParser::~ClangExpressionParser() = default;
902
903	namespace {
904
905	/// \class CodeComplete
906	///
907	/// A code completion consumer for the clang Sema that is responsible for
908	/// creating the completion suggestions when a user requests completion
909	/// of an incomplete `expr` invocation.
910	class CodeComplete : public CodeCompleteConsumer {
911	CodeCompletionTUInfo m_info;
912
913	std::string m_expr;
914	unsigned m_position = 0;
915	/// The printing policy we use when printing declarations for our completion
916	/// descriptions.
917	clang::PrintingPolicy m_desc_policy;
918
919	struct CompletionWithPriority {
920	CompletionResult::Completion completion;
921	/// See CodeCompletionResult::Priority;
922	unsigned Priority;
923
924	/// Establishes a deterministic order in a list of CompletionWithPriority.
925	/// The order returned here is the order in which the completions are
926	/// displayed to the user.
927	bool operator<(const CompletionWithPriority &o) const {
928	// High priority results should come first.
929	if (Priority != o.Priority)
930	return Priority > o.Priority;
931
932	// Identical priority, so just make sure it's a deterministic order.
933	return completion.GetUniqueKey() < o.completion.GetUniqueKey();
934	}
935	};
936
937	/// The stored completions.
938	/// Warning: These are in a non-deterministic order until they are sorted
939	/// and returned back to the caller.
940	std::vector<CompletionWithPriority> m_completions;
941
942	/// Returns true if the given character can be used in an identifier.
943	/// This also returns true for numbers because for completion we usually
944	/// just iterate backwards over iterators.
945	///
946	/// Note: lldb uses '$' in its internal identifiers, so we also allow this.
947	static bool IsIdChar(char c) {
948	return c == '_' || std::isalnum(c) || c == '$';
949	}
950
951	/// Returns true if the given character is used to separate arguments
952	/// in the command line of lldb.
953	static bool IsTokenSeparator(char c) { return c == ' ' || c == '\t'; }
954
955	/// Drops all tokens in front of the expression that are unrelated for
956	/// the completion of the cmd line. 'unrelated' means here that the token
957	/// is not interested for the lldb completion API result.
958	StringRef dropUnrelatedFrontTokens(StringRef cmd) const {
959	if (cmd.empty())
960	return cmd;
961
962	// If we are at the start of a word, then all tokens are unrelated to
963	// the current completion logic.
964	if (IsTokenSeparator(c: cmd.back()))
965	return StringRef();
966
967	// Remove all previous tokens from the string as they are unrelated
968	// to completing the current token.
969	StringRef to_remove = cmd;
970	while (!to_remove.empty() && !IsTokenSeparator(c: to_remove.back())) {
971	to_remove = to_remove.drop_back();
972	}
973	cmd = cmd.drop_front(N: to_remove.size());
974
975	return cmd;
976	}
977
978	/// Removes the last identifier token from the given cmd line.
979	StringRef removeLastToken(StringRef cmd) const {
980	while (!cmd.empty() && IsIdChar(c: cmd.back())) {
981	cmd = cmd.drop_back();
982	}
983	return cmd;
984	}
985
986	/// Attempts to merge the given completion from the given position into the
987	/// existing command. Returns the completion string that can be returned to
988	/// the lldb completion API.
989	std::string mergeCompletion(StringRef existing, unsigned pos,
990	StringRef completion) const {
991	StringRef existing_command = existing.substr(Start: 0, N: pos);
992	// We rewrite the last token with the completion, so let's drop that
993	// token from the command.
994	existing_command = removeLastToken(cmd: existing_command);
995	// We also should remove all previous tokens from the command as they
996	// would otherwise be added to the completion that already has the
997	// completion.
998	existing_command = dropUnrelatedFrontTokens(cmd: existing_command);
999	return existing_command.str() + completion.str();
1000	}
1001
1002	public:
1003	/// Constructs a CodeComplete consumer that can be attached to a Sema.
1004	///
1005	/// \param[out] expr
1006	/// The whole expression string that we are currently parsing. This
1007	/// string needs to be equal to the input the user typed, and NOT the
1008	/// final code that Clang is parsing.
1009	/// \param[out] position
1010	/// The character position of the user cursor in the `expr` parameter.
1011	///
1012	CodeComplete(clang::LangOptions ops, std::string expr, unsigned position)
1013	: CodeCompleteConsumer(CodeCompleteOptions()),
1014	m_info(std::make_shared<GlobalCodeCompletionAllocator>()), m_expr(expr),
1015	m_position(position), m_desc_policy(ops) {
1016
1017	// Ensure that the printing policy is producing a description that is as
1018	// short as possible.
1019	m_desc_policy.SuppressScope = true;
1020	m_desc_policy.SuppressTagKeyword = true;
1021	m_desc_policy.FullyQualifiedName = false;
1022	m_desc_policy.TerseOutput = true;
1023	m_desc_policy.IncludeNewlines = false;
1024	m_desc_policy.UseVoidForZeroParams = false;
1025	m_desc_policy.Bool = true;
1026	}
1027
1028	/// \name Code-completion filtering
1029	/// Check if the result should be filtered out.
1030	bool isResultFilteredOut(StringRef Filter,
1031	CodeCompletionResult Result) override {
1032	// This code is mostly copied from CodeCompleteConsumer.
1033	switch (Result.Kind) {
1034	case CodeCompletionResult::RK_Declaration:
1035	return !(
1036	Result.Declaration->getIdentifier() &&
1037	Result.Declaration->getIdentifier()->getName().starts_with(Prefix: Filter));
1038	case CodeCompletionResult::RK_Keyword:
1039	return !StringRef(Result.Keyword).starts_with(Prefix: Filter);
1040	case CodeCompletionResult::RK_Macro:
1041	return !Result.Macro->getName().starts_with(Prefix: Filter);
1042	case CodeCompletionResult::RK_Pattern:
1043	return !StringRef(Result.Pattern->getAsString()).starts_with(Prefix: Filter);
1044	}
1045	// If we trigger this assert or the above switch yields a warning, then
1046	// CodeCompletionResult has been enhanced with more kinds of completion
1047	// results. Expand the switch above in this case.
1048	assert(false && "Unknown completion result type?");
1049	// If we reach this, then we should just ignore whatever kind of unknown
1050	// result we got back. We probably can't turn it into any kind of useful
1051	// completion suggestion with the existing code.
1052	return true;
1053	}
1054
1055	private:
1056	/// Generate the completion strings for the given CodeCompletionResult.
1057	/// Note that this function has to process results that could come in
1058	/// non-deterministic order, so this function should have no side effects.
1059	/// To make this easier to enforce, this function and all its parameters
1060	/// should always be const-qualified.
1061	/// \return Returns std::nullopt if no completion should be provided for the
1062	/// given CodeCompletionResult.
1063	std::optional<CompletionWithPriority>
1064	getCompletionForResult(const CodeCompletionResult &R) const {
1065	std::string ToInsert;
1066	std::string Description;
1067	// Handle the different completion kinds that come from the Sema.
1068	switch (R.Kind) {
1069	case CodeCompletionResult::RK_Declaration: {
1070	const NamedDecl *D = R.Declaration;
1071	ToInsert = R.Declaration->getNameAsString();
1072	// If we have a function decl that has no arguments we want to
1073	// complete the empty parantheses for the user. If the function has
1074	// arguments, we at least complete the opening bracket.
1075	if (const FunctionDecl *F = dyn_cast<FunctionDecl>(Val: D)) {
1076	if (F->getNumParams() == 0)
1077	ToInsert += "()";
1078	else
1079	ToInsert += "(";
1080	raw_string_ostream OS(Description);
1081	F->print(OS, m_desc_policy, false);
1082	} else if (const VarDecl *V = dyn_cast<VarDecl>(Val: D)) {
1083	Description = V->getType().getAsString(m_desc_policy);
1084	} else if (const FieldDecl *F = dyn_cast<FieldDecl>(Val: D)) {
1085	Description = F->getType().getAsString(m_desc_policy);
1086	} else if (const NamespaceDecl *N = dyn_cast<NamespaceDecl>(Val: D)) {
1087	// If we try to complete a namespace, then we can directly append
1088	// the '::'.
1089	if (!N->isAnonymousNamespace())
1090	ToInsert += "::";
1091	}
1092	break;
1093	}
1094	case CodeCompletionResult::RK_Keyword:
1095	ToInsert = R.Keyword;
1096	break;
1097	case CodeCompletionResult::RK_Macro:
1098	ToInsert = R.Macro->getName().str();
1099	break;
1100	case CodeCompletionResult::RK_Pattern:
1101	ToInsert = R.Pattern->getTypedText();
1102	break;
1103	}
1104	// We also filter some internal lldb identifiers here. The user
1105	// shouldn't see these.
1106	if (llvm::StringRef(ToInsert).starts_with(Prefix: "$__lldb_"))
1107	return std::nullopt;
1108	if (ToInsert.empty())
1109	return std::nullopt;
1110	// Merge the suggested Token into the existing command line to comply
1111	// with the kind of result the lldb API expects.
1112	std::string CompletionSuggestion =
1113	mergeCompletion(existing: m_expr, pos: m_position, completion: ToInsert);
1114
1115	CompletionResult::Completion completion(CompletionSuggestion, Description,
1116	CompletionMode::Normal);
1117	return {{.completion: completion, .Priority: R.Priority}};
1118	}
1119
1120	public:
1121	/// Adds the completions to the given CompletionRequest.
1122	void GetCompletions(CompletionRequest &request) {
1123	// Bring m_completions into a deterministic order and pass it on to the
1124	// CompletionRequest.
1125	llvm::sort(C&: m_completions);
1126
1127	for (const CompletionWithPriority &C : m_completions)
1128	request.AddCompletion(completion: C.completion.GetCompletion(),
1129	description: C.completion.GetDescription(),
1130	mode: C.completion.GetMode());
1131	}
1132
1133	/// \name Code-completion callbacks
1134	/// Process the finalized code-completion results.
1135	void ProcessCodeCompleteResults(Sema &SemaRef, CodeCompletionContext Context,
1136	CodeCompletionResult *Results,
1137	unsigned NumResults) override {
1138
1139	// The Sema put the incomplete token we try to complete in here during
1140	// lexing, so we need to retrieve it here to know what we are completing.
1141	StringRef Filter = SemaRef.getPreprocessor().getCodeCompletionFilter();
1142
1143	// Iterate over all the results. Filter out results we don't want and
1144	// process the rest.
1145	for (unsigned I = 0; I != NumResults; ++I) {
1146	// Filter the results with the information from the Sema.
1147	if (!Filter.empty() && isResultFilteredOut(Filter, Result: Results[I]))
1148	continue;
1149
1150	CodeCompletionResult &R = Results[I];
1151	std::optional<CompletionWithPriority> CompletionAndPriority =
1152	getCompletionForResult(R);
1153	if (!CompletionAndPriority)
1154	continue;
1155	m_completions.push_back(x: *CompletionAndPriority);
1156	}
1157	}
1158
1159	/// \param S the semantic-analyzer object for which code-completion is being
1160	/// done.
1161	///
1162	/// \param CurrentArg the index of the current argument.
1163	///
1164	/// \param Candidates an array of overload candidates.
1165	///
1166	/// \param NumCandidates the number of overload candidates
1167	void ProcessOverloadCandidates(Sema &S, unsigned CurrentArg,
1168	OverloadCandidate *Candidates,
1169	unsigned NumCandidates,
1170	SourceLocation OpenParLoc,
1171	bool Braced) override {
1172	// At the moment we don't filter out any overloaded candidates.
1173	}
1174
1175	CodeCompletionAllocator &getAllocator() override {
1176	return m_info.getAllocator();
1177	}
1178
1179	CodeCompletionTUInfo &getCodeCompletionTUInfo() override { return m_info; }
1180	};
1181	} // namespace
1182
1183	bool ClangExpressionParser::Complete(CompletionRequest &request, unsigned line,
1184	unsigned pos, unsigned typed_pos) {
1185	DiagnosticManager mgr;
1186	// We need the raw user expression here because that's what the CodeComplete
1187	// class uses to provide completion suggestions.
1188	// However, the `Text` method only gives us the transformed expression here.
1189	// To actually get the raw user input here, we have to cast our expression to
1190	// the LLVMUserExpression which exposes the right API. This should never fail
1191	// as we always have a ClangUserExpression whenever we call this.
1192	ClangUserExpression *llvm_expr = cast<ClangUserExpression>(Val: &m_expr);
1193	CodeComplete CC(m_compiler->getLangOpts(), llvm_expr->GetUserText(),
1194	typed_pos);
1195	// We don't need a code generator for parsing.
1196	m_code_generator.reset();
1197	// Start parsing the expression with our custom code completion consumer.
1198	ParseInternal(diagnostic_manager&: mgr, completion: &CC, completion_line: line, completion_column: pos);
1199	CC.GetCompletions(request);
1200	return true;
1201	}
1202
1203	unsigned ClangExpressionParser::Parse(DiagnosticManager &diagnostic_manager) {
1204	return ParseInternal(diagnostic_manager);
1205	}
1206
1207	unsigned
1208	ClangExpressionParser::ParseInternal(DiagnosticManager &diagnostic_manager,
1209	CodeCompleteConsumer *completion_consumer,
1210	unsigned completion_line,
1211	unsigned completion_column) {
1212	ClangDiagnosticManagerAdapter *adapter =
1213	static_cast<ClangDiagnosticManagerAdapter *>(
1214	m_compiler->getDiagnostics().getClient());
1215
1216	adapter->ResetManager(manager: &diagnostic_manager);
1217
1218	const char *expr_text = m_expr.Text();
1219
1220	clang::SourceManager &source_mgr = m_compiler->getSourceManager();
1221	bool created_main_file = false;
1222
1223	// Clang wants to do completion on a real file known by Clang's file manager,
1224	// so we have to create one to make this work.
1225	// TODO: We probably could also simulate to Clang's file manager that there
1226	// is a real file that contains our code.
1227	bool should_create_file = completion_consumer != nullptr;
1228
1229	// We also want a real file on disk if we generate full debug info.
1230	should_create_file |= m_compiler->getCodeGenOpts().getDebugInfo() ==
1231	codegenoptions::FullDebugInfo;
1232
1233	if (should_create_file) {
1234	int temp_fd = -1;
1235	llvm::SmallString<128> result_path;
1236	if (FileSpec tmpdir_file_spec = HostInfo::GetProcessTempDir()) {
1237	tmpdir_file_spec.AppendPathComponent(component: "lldb-%%%%%%.expr");
1238	std::string temp_source_path = tmpdir_file_spec.GetPath();
1239	llvm::sys::fs::createUniqueFile(Model: temp_source_path, ResultFD&: temp_fd, ResultPath&: result_path);
1240	} else {
1241	llvm::sys::fs::createTemporaryFile(Prefix: "lldb", Suffix: "expr", ResultFD&: temp_fd, ResultPath&: result_path);
1242	}
1243
1244	if (temp_fd != -1) {
1245	lldb_private::NativeFile file(temp_fd, File::eOpenOptionWriteOnly, true);
1246	const size_t expr_text_len = strlen(s: expr_text);
1247	size_t bytes_written = expr_text_len;
1248	if (file.Write(buf: expr_text, num_bytes&: bytes_written).Success()) {
1249	if (bytes_written == expr_text_len) {
1250	file.Close();
1251	if (auto fileEntry = m_compiler->getFileManager().getOptionalFileRef(
1252	Filename: result_path)) {
1253	source_mgr.setMainFileID(source_mgr.createFileID(
1254	SourceFile: *fileEntry, IncludePos: SourceLocation(), FileCharacter: SrcMgr::C_User));
1255	created_main_file = true;
1256	}
1257	}
1258	}
1259	}
1260	}
1261
1262	if (!created_main_file) {
1263	std::unique_ptr<MemoryBuffer> memory_buffer =
1264	MemoryBuffer::getMemBufferCopy(InputData: expr_text, BufferName: m_filename);
1265	source_mgr.setMainFileID(source_mgr.createFileID(Buffer: std::move(memory_buffer)));
1266	}
1267
1268	adapter->BeginSourceFile(LO: m_compiler->getLangOpts(),
1269	PP: &m_compiler->getPreprocessor());
1270
1271	ClangExpressionHelper *type_system_helper =
1272	dyn_cast<ClangExpressionHelper>(Val: m_expr.GetTypeSystemHelper());
1273
1274	// If we want to parse for code completion, we need to attach our code
1275	// completion consumer to the Sema and specify a completion position.
1276	// While parsing the Sema will call this consumer with the provided
1277	// completion suggestions.
1278	if (completion_consumer) {
1279	auto main_file =
1280	source_mgr.getFileEntryRefForID(FID: source_mgr.getMainFileID());
1281	auto &PP = m_compiler->getPreprocessor();
1282	// Lines and columns start at 1 in Clang, but code completion positions are
1283	// indexed from 0, so we need to add 1 to the line and column here.
1284	++completion_line;
1285	++completion_column;
1286	PP.SetCodeCompletionPoint(File: *main_file, Line: completion_line, Column: completion_column);
1287	}
1288
1289	ASTConsumer *ast_transformer =
1290	type_system_helper->ASTTransformer(passthrough: m_code_generator.get());
1291
1292	std::unique_ptr<clang::ASTConsumer> Consumer;
1293	if (ast_transformer) {
1294	Consumer = std::make_unique<ASTConsumerForwarder>(args&: ast_transformer);
1295	} else if (m_code_generator) {
1296	Consumer = std::make_unique<ASTConsumerForwarder>(args: m_code_generator.get());
1297	} else {
1298	Consumer = std::make_unique<ASTConsumer>();
1299	}
1300
1301	clang::ASTContext &ast_context = m_compiler->getASTContext();
1302
1303	m_compiler->setSema(new Sema(m_compiler->getPreprocessor(), ast_context,
1304	*Consumer, TU_Complete, completion_consumer));
1305	m_compiler->setASTConsumer(std::move(Consumer));
1306
1307	if (ast_context.getLangOpts().Modules) {
1308	m_compiler->createASTReader();
1309	m_ast_context->setSema(&m_compiler->getSema());
1310	}
1311
1312	ClangExpressionDeclMap *decl_map = type_system_helper->DeclMap();
1313	if (decl_map) {
1314	decl_map->InstallCodeGenerator(code_gen: &m_compiler->getASTConsumer());
1315	decl_map->InstallDiagnosticManager(diag_manager&: diagnostic_manager);
1316
1317	clang::ExternalASTSource *ast_source = decl_map->CreateProxy();
1318
1319	auto *ast_source_wrapper = new ExternalASTSourceWrapper(ast_source);
1320
1321	if (ast_context.getExternalSource()) {
1322	auto *module_wrapper =
1323	new ExternalASTSourceWrapper(ast_context.getExternalSource());
1324
1325	auto *multiplexer =
1326	new SemaSourceWithPriorities(module_wrapper, ast_source_wrapper);
1327
1328	ast_context.setExternalSource(multiplexer);
1329	} else {
1330	ast_context.setExternalSource(ast_source);
1331	}
1332	m_compiler->getSema().addExternalSource(E: ast_source_wrapper);
1333	decl_map->InstallASTContext(ast_context&: *m_ast_context);
1334	}
1335
1336	// Check that the ASTReader is properly attached to ASTContext and Sema.
1337	if (ast_context.getLangOpts().Modules) {
1338	assert(m_compiler->getASTContext().getExternalSource() &&
1339	"ASTContext doesn't know about the ASTReader?");
1340	assert(m_compiler->getSema().getExternalSource() &&
1341	"Sema doesn't know about the ASTReader?");
1342	}
1343
1344	{
1345	llvm::CrashRecoveryContextCleanupRegistrar<Sema> CleanupSema(
1346	&m_compiler->getSema());
1347	ParseAST(S&: m_compiler->getSema(), PrintStats: false, SkipFunctionBodies: false);
1348	}
1349
1350	// Make sure we have no pointer to the Sema we are about to destroy.
1351	if (ast_context.getLangOpts().Modules)
1352	m_ast_context->setSema(nullptr);
1353	// Destroy the Sema. This is necessary because we want to emulate the
1354	// original behavior of ParseAST (which also destroys the Sema after parsing).
1355	m_compiler->setSema(nullptr);
1356
1357	adapter->EndSourceFile();
1358
1359	unsigned num_errors = adapter->getNumErrors();
1360
1361	if (m_pp_callbacks && m_pp_callbacks->hasErrors()) {
1362	num_errors++;
1363	diagnostic_manager.PutString(severity: lldb::eSeverityError,
1364	str: "while importing modules:");
1365	diagnostic_manager.AppendMessageToDiagnostic(
1366	str: m_pp_callbacks->getErrorString());
1367	}
1368
1369	if (!num_errors) {
1370	type_system_helper->CommitPersistentDecls();
1371	}
1372
1373	adapter->ResetManager();
1374
1375	return num_errors;
1376	}
1377
1378	/// Applies the given Fix-It hint to the given commit.
1379	static void ApplyFixIt(const FixItHint &fixit, clang::edit::Commit &commit) {
1380	// This is cobbed from clang::Rewrite::FixItRewriter.
1381	if (fixit.CodeToInsert.empty()) {
1382	if (fixit.InsertFromRange.isValid()) {
1383	commit.insertFromRange(loc: fixit.RemoveRange.getBegin(),
1384	range: fixit.InsertFromRange, /*afterToken=*/false,
1385	beforePreviousInsertions: fixit.BeforePreviousInsertions);
1386	return;
1387	}
1388	commit.remove(range: fixit.RemoveRange);
1389	return;
1390	}
1391	if (fixit.RemoveRange.isTokenRange() ||
1392	fixit.RemoveRange.getBegin() != fixit.RemoveRange.getEnd()) {
1393	commit.replace(range: fixit.RemoveRange, text: fixit.CodeToInsert);
1394	return;
1395	}
1396	commit.insert(loc: fixit.RemoveRange.getBegin(), text: fixit.CodeToInsert,
1397	/*afterToken=*/false, beforePreviousInsertions: fixit.BeforePreviousInsertions);
1398	}
1399
1400	bool ClangExpressionParser::RewriteExpression(
1401	DiagnosticManager &diagnostic_manager) {
1402	clang::SourceManager &source_manager = m_compiler->getSourceManager();
1403	clang::edit::EditedSource editor(source_manager, m_compiler->getLangOpts(),
1404	nullptr);
1405	clang::edit::Commit commit(editor);
1406	clang::Rewriter rewriter(source_manager, m_compiler->getLangOpts());
1407
1408	class RewritesReceiver : public edit::EditsReceiver {
1409	Rewriter &rewrite;
1410
1411	public:
1412	RewritesReceiver(Rewriter &in_rewrite) : rewrite(in_rewrite) {}
1413
1414	void insert(SourceLocation loc, StringRef text) override {
1415	rewrite.InsertText(Loc: loc, Str: text);
1416	}
1417	void replace(CharSourceRange range, StringRef text) override {
1418	rewrite.ReplaceText(Start: range.getBegin(), OrigLength: rewrite.getRangeSize(Range: range), NewStr: text);
1419	}
1420	};
1421
1422	RewritesReceiver rewrites_receiver(rewriter);
1423
1424	const DiagnosticList &diagnostics = diagnostic_manager.Diagnostics();
1425	size_t num_diags = diagnostics.size();
1426	if (num_diags == 0)
1427	return false;
1428
1429	for (const auto &diag : diagnostic_manager.Diagnostics()) {
1430	const auto *diagnostic = llvm::dyn_cast<ClangDiagnostic>(Val: diag.get());
1431	if (!diagnostic)
1432	continue;
1433	if (!diagnostic->HasFixIts())
1434	continue;
1435	for (const FixItHint &fixit : diagnostic->FixIts())
1436	ApplyFixIt(fixit, commit);
1437	}
1438
1439	// FIXME - do we want to try to propagate specific errors here?
1440	if (!commit.isCommitable())
1441	return false;
1442	else if (!editor.commit(commit))
1443	return false;
1444
1445	// Now play all the edits, and stash the result in the diagnostic manager.
1446	editor.applyRewrites(receiver&: rewrites_receiver);
1447	RewriteBuffer &main_file_buffer =
1448	rewriter.getEditBuffer(FID: source_manager.getMainFileID());
1449
1450	std::string fixed_expression;
1451	llvm::raw_string_ostream out_stream(fixed_expression);
1452
1453	main_file_buffer.write(Stream&: out_stream);
1454	diagnostic_manager.SetFixedExpression(fixed_expression);
1455
1456	return true;
1457	}
1458
1459	static bool FindFunctionInModule(ConstString &mangled_name,
1460	llvm::Module *module, const char *orig_name) {
1461	for (const auto &func : module->getFunctionList()) {
1462	const StringRef &name = func.getName();
1463	if (name.contains(Other: orig_name)) {
1464	mangled_name.SetString(name);
1465	return true;
1466	}
1467	}
1468
1469	return false;
1470	}
1471
1472	lldb_private::Status ClangExpressionParser::DoPrepareForExecution(
1473	lldb::addr_t &func_addr, lldb::addr_t &func_end,
1474	lldb::IRExecutionUnitSP &execution_unit_sp, ExecutionContext &exe_ctx,
1475	bool &can_interpret, ExecutionPolicy execution_policy) {
1476	func_addr = LLDB_INVALID_ADDRESS;
1477	func_end = LLDB_INVALID_ADDRESS;
1478	Log *log = GetLog(mask: LLDBLog::Expressions);
1479
1480	lldb_private::Status err;
1481
1482	std::unique_ptr<llvm::Module> llvm_module_up(
1483	m_code_generator->ReleaseModule());
1484
1485	if (!llvm_module_up) {
1486	err = Status::FromErrorString(str: "IR doesn't contain a module");
1487	return err;
1488	}
1489
1490	ConstString function_name;
1491
1492	if (execution_policy != eExecutionPolicyTopLevel) {
1493	// Find the actual name of the function (it's often mangled somehow)
1494
1495	if (!FindFunctionInModule(mangled_name&: function_name, module: llvm_module_up.get(),
1496	orig_name: m_expr.FunctionName())) {
1497	err = Status::FromErrorStringWithFormat(
1498	format: "Couldn't find %s() in the module", m_expr.FunctionName());
1499	return err;
1500	} else {
1501	LLDB_LOGF(log, "Found function %s for %s", function_name.AsCString(),
1502	m_expr.FunctionName());
1503	}
1504	}
1505
1506	SymbolContext sc;
1507
1508	if (lldb::StackFrameSP frame_sp = exe_ctx.GetFrameSP()) {
1509	sc = frame_sp->GetSymbolContext(resolve_scope: lldb::eSymbolContextEverything);
1510	} else if (lldb::TargetSP target_sp = exe_ctx.GetTargetSP()) {
1511	sc.target_sp = target_sp;
1512	}
1513
1514	LLVMUserExpression::IRPasses custom_passes;
1515	{
1516	auto lang = m_expr.Language();
1517	LLDB_LOGF(log, "%s - Current expression language is %s\n", __FUNCTION__,
1518	lang.GetDescription().data());
1519	lldb::ProcessSP process_sp = exe_ctx.GetProcessSP();
1520	if (process_sp && lang != lldb::eLanguageTypeUnknown) {
1521	auto runtime = process_sp->GetLanguageRuntime(language: lang.AsLanguageType());
1522	if (runtime)
1523	runtime->GetIRPasses(custom_passes);
1524	}
1525	}
1526
1527	if (custom_passes.EarlyPasses) {
1528	LLDB_LOGF(log,
1529	"%s - Running Early IR Passes from LanguageRuntime on "
1530	"expression module '%s'",
1531	__FUNCTION__, m_expr.FunctionName());
1532
1533	custom_passes.EarlyPasses->run(M&: *llvm_module_up);
1534	}
1535
1536	execution_unit_sp = std::make_shared<IRExecutionUnit>(
1537	args&: m_llvm_context, // handed off here
1538	args&: llvm_module_up, // handed off here
1539	args&: function_name, args: exe_ctx.GetTargetSP(), args&: sc,
1540	args&: m_compiler->getTargetOpts().Features);
1541
1542	if (auto *options = m_expr.GetOptions())
1543	execution_unit_sp->AppendPreferredSymbolContexts(
1544	contexts: options->GetPreferredSymbolContexts());
1545
1546	ClangExpressionHelper *type_system_helper =
1547	dyn_cast<ClangExpressionHelper>(Val: m_expr.GetTypeSystemHelper());
1548	ClangExpressionDeclMap *decl_map =
1549	type_system_helper->DeclMap(); // result can be NULL
1550
1551	if (decl_map) {
1552	StreamString error_stream;
1553	IRForTarget ir_for_target(decl_map, m_expr.NeedsVariableResolution(),
1554	*execution_unit_sp, error_stream,
1555	function_name.AsCString());
1556
1557	if (!ir_for_target.runOnModule(llvm_module&: *execution_unit_sp->GetModule())) {
1558	err = Status(error_stream.GetString().str());
1559	return err;
1560	}
1561
1562	Process *process = exe_ctx.GetProcessPtr();
1563
1564	if (execution_policy != eExecutionPolicyAlways &&
1565	execution_policy != eExecutionPolicyTopLevel) {
1566	lldb_private::Status interpret_error;
1567
1568	bool interpret_function_calls =
1569	!process ? false : process->CanInterpretFunctionCalls();
1570	can_interpret = IRInterpreter::CanInterpret(
1571	module&: *execution_unit_sp->GetModule(), function&: *execution_unit_sp->GetFunction(),
1572	error&: interpret_error, support_function_calls: interpret_function_calls);
1573
1574	if (!can_interpret && execution_policy == eExecutionPolicyNever) {
1575	err = Status::FromErrorStringWithFormat(
1576	format: "Can't evaluate the expression without a running target due to: %s",
1577	interpret_error.AsCString());
1578	return err;
1579	}
1580	}
1581
1582	if (!process && execution_policy == eExecutionPolicyAlways) {
1583	err = Status::FromErrorString(
1584	str: "Expression needed to run in the target, but the "
1585	"target can't be run");
1586	return err;
1587	}
1588
1589	if (!process && execution_policy == eExecutionPolicyTopLevel) {
1590	err = Status::FromErrorString(
1591	str: "Top-level code needs to be inserted into a runnable "
1592	"target, but the target can't be run");
1593	return err;
1594	}
1595
1596	if (execution_policy == eExecutionPolicyAlways ||
1597	(execution_policy != eExecutionPolicyTopLevel && !can_interpret)) {
1598	if (m_expr.NeedsValidation() && process) {
1599	if (!process->GetDynamicCheckers()) {
1600	ClangDynamicCheckerFunctions *dynamic_checkers =
1601	new ClangDynamicCheckerFunctions();
1602
1603	DiagnosticManager install_diags;
1604	if (Error Err = dynamic_checkers->Install(diagnostic_manager&: install_diags, exe_ctx))
1605	return Status::FromError(error: install_diags.GetAsError(
1606	result: lldb::eExpressionSetupError, message: "couldn't install checkers:"));
1607
1608	process->SetDynamicCheckers(dynamic_checkers);
1609
1610	LLDB_LOGF(log, "== [ClangExpressionParser::PrepareForExecution] "
1611	"Finished installing dynamic checkers ==");
1612	}
1613
1614	if (auto *checker_funcs = llvm::dyn_cast<ClangDynamicCheckerFunctions>(
1615	Val: process->GetDynamicCheckers())) {
1616	IRDynamicChecks ir_dynamic_checks(*checker_funcs,
1617	function_name.AsCString());
1618
1619	llvm::Module *module = execution_unit_sp->GetModule();
1620	if (!module || !ir_dynamic_checks.runOnModule(M&: *module)) {
1621	err = Status::FromErrorString(
1622	str: "Couldn't add dynamic checks to the expression");
1623	return err;
1624	}
1625
1626	if (custom_passes.LatePasses) {
1627	LLDB_LOGF(log,
1628	"%s - Running Late IR Passes from LanguageRuntime on "
1629	"expression module '%s'",
1630	__FUNCTION__, m_expr.FunctionName());
1631
1632	custom_passes.LatePasses->run(M&: *module);
1633	}
1634	}
1635	}
1636	}
1637
1638	if (execution_policy == eExecutionPolicyAlways ||
1639	execution_policy == eExecutionPolicyTopLevel || !can_interpret) {
1640	execution_unit_sp->GetRunnableInfo(error&: err, func_addr, func_end);
1641	}
1642	} else {
1643	execution_unit_sp->GetRunnableInfo(error&: err, func_addr, func_end);
1644	}
1645
1646	return err;
1647	}
1648