1 //===-- ItaniumABILanguageRuntime.cpp --------------------------------------*-
2 //C++ -*-===//
3 //
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //
8 //===----------------------------------------------------------------------===//
9
10 #include "ItaniumABILanguageRuntime.h"
11
12 #include "lldb/Breakpoint/BreakpointLocation.h"
13 #include "lldb/Core/Mangled.h"
14 #include "lldb/Core/Module.h"
15 #include "lldb/Core/PluginManager.h"
16 #include "lldb/Core/ValueObject.h"
17 #include "lldb/Core/ValueObjectMemory.h"
18 #include "lldb/DataFormatters/FormattersHelpers.h"
19 #include "lldb/Expression/DiagnosticManager.h"
20 #include "lldb/Expression/FunctionCaller.h"
21 #include "lldb/Interpreter/CommandObject.h"
22 #include "lldb/Interpreter/CommandObjectMultiword.h"
23 #include "lldb/Interpreter/CommandReturnObject.h"
24 #include "lldb/Symbol/ClangASTContext.h"
25 #include "lldb/Symbol/Symbol.h"
26 #include "lldb/Symbol/SymbolFile.h"
27 #include "lldb/Symbol/TypeList.h"
28 #include "lldb/Target/Process.h"
29 #include "lldb/Target/RegisterContext.h"
30 #include "lldb/Target/SectionLoadList.h"
31 #include "lldb/Target/StopInfo.h"
32 #include "lldb/Target/Target.h"
33 #include "lldb/Target/Thread.h"
34 #include "lldb/Utility/ConstString.h"
35 #include "lldb/Utility/Log.h"
36 #include "lldb/Utility/Scalar.h"
37 #include "lldb/Utility/Status.h"
38
39 #include <vector>
40
41 using namespace lldb;
42 using namespace lldb_private;
43
44 static const char *vtable_demangled_prefix = "vtable for ";
45
46 char ItaniumABILanguageRuntime::ID = 0;
47
CouldHaveDynamicValue(ValueObject & in_value)48 bool ItaniumABILanguageRuntime::CouldHaveDynamicValue(ValueObject &in_value) {
49 const bool check_cxx = true;
50 const bool check_objc = false;
51 return in_value.GetCompilerType().IsPossibleDynamicType(nullptr, check_cxx,
52 check_objc);
53 }
54
GetTypeInfoFromVTableAddress(ValueObject & in_value,lldb::addr_t original_ptr,lldb::addr_t vtable_load_addr)55 TypeAndOrName ItaniumABILanguageRuntime::GetTypeInfoFromVTableAddress(
56 ValueObject &in_value, lldb::addr_t original_ptr,
57 lldb::addr_t vtable_load_addr) {
58 if (m_process && vtable_load_addr != LLDB_INVALID_ADDRESS) {
59 // Find the symbol that contains the "vtable_load_addr" address
60 Address vtable_addr;
61 Target &target = m_process->GetTarget();
62 if (!target.GetSectionLoadList().IsEmpty()) {
63 if (target.GetSectionLoadList().ResolveLoadAddress(vtable_load_addr,
64 vtable_addr)) {
65 // See if we have cached info for this type already
66 TypeAndOrName type_info = GetDynamicTypeInfo(vtable_addr);
67 if (type_info)
68 return type_info;
69
70 SymbolContext sc;
71 target.GetImages().ResolveSymbolContextForAddress(
72 vtable_addr, eSymbolContextSymbol, sc);
73 Symbol *symbol = sc.symbol;
74 if (symbol != nullptr) {
75 const char *name =
76 symbol->GetMangled()
77 .GetDemangledName(lldb::eLanguageTypeC_plus_plus)
78 .AsCString();
79 if (name && strstr(name, vtable_demangled_prefix) == name) {
80 Log *log(
81 lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OBJECT));
82 LLDB_LOGF(log,
83 "0x%16.16" PRIx64
84 ": static-type = '%s' has vtable symbol '%s'\n",
85 original_ptr, in_value.GetTypeName().GetCString(), name);
86 // We are a C++ class, that's good. Get the class name and look it
87 // up:
88 const char *class_name = name + strlen(vtable_demangled_prefix);
89 // We know the class name is absolute, so tell FindTypes that by
90 // prefixing it with the root namespace:
91 std::string lookup_name("::");
92 lookup_name.append(class_name);
93
94 type_info.SetName(class_name);
95 const bool exact_match = true;
96 TypeList class_types;
97
98 // First look in the module that the vtable symbol came from and
99 // look for a single exact match.
100 llvm::DenseSet<SymbolFile *> searched_symbol_files;
101 if (sc.module_sp)
102 sc.module_sp->FindTypes(ConstString(lookup_name), exact_match, 1,
103 searched_symbol_files, class_types);
104
105 // If we didn't find a symbol, then move on to the entire module
106 // list in the target and get as many unique matches as possible
107 if (class_types.Empty())
108 target.GetImages().FindTypes(nullptr, ConstString(lookup_name),
109 exact_match, UINT32_MAX,
110 searched_symbol_files, class_types);
111
112 lldb::TypeSP type_sp;
113 if (class_types.Empty()) {
114 LLDB_LOGF(log, "0x%16.16" PRIx64 ": is not dynamic\n",
115 original_ptr);
116 return TypeAndOrName();
117 }
118 if (class_types.GetSize() == 1) {
119 type_sp = class_types.GetTypeAtIndex(0);
120 if (type_sp) {
121 if (ClangASTContext::IsCXXClassType(
122 type_sp->GetForwardCompilerType())) {
123 LLDB_LOGF(
124 log,
125 "0x%16.16" PRIx64
126 ": static-type = '%s' has dynamic type: uid={0x%" PRIx64
127 "}, type-name='%s'\n",
128 original_ptr, in_value.GetTypeName().AsCString(),
129 type_sp->GetID(), type_sp->GetName().GetCString());
130 type_info.SetTypeSP(type_sp);
131 }
132 }
133 } else {
134 size_t i;
135 if (log) {
136 for (i = 0; i < class_types.GetSize(); i++) {
137 type_sp = class_types.GetTypeAtIndex(i);
138 if (type_sp) {
139 LLDB_LOGF(
140 log,
141 "0x%16.16" PRIx64
142 ": static-type = '%s' has multiple matching dynamic "
143 "types: uid={0x%" PRIx64 "}, type-name='%s'\n",
144 original_ptr, in_value.GetTypeName().AsCString(),
145 type_sp->GetID(), type_sp->GetName().GetCString());
146 }
147 }
148 }
149
150 for (i = 0; i < class_types.GetSize(); i++) {
151 type_sp = class_types.GetTypeAtIndex(i);
152 if (type_sp) {
153 if (ClangASTContext::IsCXXClassType(
154 type_sp->GetForwardCompilerType())) {
155 LLDB_LOGF(
156 log,
157 "0x%16.16" PRIx64 ": static-type = '%s' has multiple "
158 "matching dynamic types, picking "
159 "this one: uid={0x%" PRIx64 "}, type-name='%s'\n",
160 original_ptr, in_value.GetTypeName().AsCString(),
161 type_sp->GetID(), type_sp->GetName().GetCString());
162 type_info.SetTypeSP(type_sp);
163 }
164 }
165 }
166
167 if (log) {
168 LLDB_LOGF(log,
169 "0x%16.16" PRIx64
170 ": static-type = '%s' has multiple matching dynamic "
171 "types, didn't find a C++ match\n",
172 original_ptr, in_value.GetTypeName().AsCString());
173 }
174 }
175 if (type_info)
176 SetDynamicTypeInfo(vtable_addr, type_info);
177 return type_info;
178 }
179 }
180 }
181 }
182 }
183 return TypeAndOrName();
184 }
185
GetDynamicTypeAndAddress(ValueObject & in_value,lldb::DynamicValueType use_dynamic,TypeAndOrName & class_type_or_name,Address & dynamic_address,Value::ValueType & value_type)186 bool ItaniumABILanguageRuntime::GetDynamicTypeAndAddress(
187 ValueObject &in_value, lldb::DynamicValueType use_dynamic,
188 TypeAndOrName &class_type_or_name, Address &dynamic_address,
189 Value::ValueType &value_type) {
190 // For Itanium, if the type has a vtable pointer in the object, it will be at
191 // offset 0 in the object. That will point to the "address point" within the
192 // vtable (not the beginning of the vtable.) We can then look up the symbol
193 // containing this "address point" and that symbol's name demangled will
194 // contain the full class name. The second pointer above the "address point"
195 // is the "offset_to_top". We'll use that to get the start of the value
196 // object which holds the dynamic type.
197 //
198
199 class_type_or_name.Clear();
200 value_type = Value::ValueType::eValueTypeScalar;
201
202 // Only a pointer or reference type can have a different dynamic and static
203 // type:
204 if (!CouldHaveDynamicValue(in_value))
205 return false;
206
207 // First job, pull out the address at 0 offset from the object.
208 AddressType address_type;
209 lldb::addr_t original_ptr = in_value.GetPointerValue(&address_type);
210 if (original_ptr == LLDB_INVALID_ADDRESS)
211 return false;
212
213 ExecutionContext exe_ctx(in_value.GetExecutionContextRef());
214
215 Process *process = exe_ctx.GetProcessPtr();
216
217 if (process == nullptr)
218 return false;
219
220 Status error;
221 const lldb::addr_t vtable_address_point =
222 process->ReadPointerFromMemory(original_ptr, error);
223
224 if (!error.Success() || vtable_address_point == LLDB_INVALID_ADDRESS)
225 return false;
226
227 class_type_or_name = GetTypeInfoFromVTableAddress(in_value, original_ptr,
228 vtable_address_point);
229
230 if (!class_type_or_name)
231 return false;
232
233 CompilerType type = class_type_or_name.GetCompilerType();
234 // There can only be one type with a given name, so we've just found
235 // duplicate definitions, and this one will do as well as any other. We
236 // don't consider something to have a dynamic type if it is the same as
237 // the static type. So compare against the value we were handed.
238 if (!type)
239 return true;
240
241 if (ClangASTContext::AreTypesSame(in_value.GetCompilerType(), type)) {
242 // The dynamic type we found was the same type, so we don't have a
243 // dynamic type here...
244 return false;
245 }
246
247 // The offset_to_top is two pointers above the vtable pointer.
248 const uint32_t addr_byte_size = process->GetAddressByteSize();
249 const lldb::addr_t offset_to_top_location =
250 vtable_address_point - 2 * addr_byte_size;
251 // Watch for underflow, offset_to_top_location should be less than
252 // vtable_address_point
253 if (offset_to_top_location >= vtable_address_point)
254 return false;
255 const int64_t offset_to_top = process->ReadSignedIntegerFromMemory(
256 offset_to_top_location, addr_byte_size, INT64_MIN, error);
257
258 if (offset_to_top == INT64_MIN)
259 return false;
260 // So the dynamic type is a value that starts at offset_to_top above
261 // the original address.
262 lldb::addr_t dynamic_addr = original_ptr + offset_to_top;
263 if (!process->GetTarget().GetSectionLoadList().ResolveLoadAddress(
264 dynamic_addr, dynamic_address)) {
265 dynamic_address.SetRawAddress(dynamic_addr);
266 }
267 return true;
268 }
269
FixUpDynamicType(const TypeAndOrName & type_and_or_name,ValueObject & static_value)270 TypeAndOrName ItaniumABILanguageRuntime::FixUpDynamicType(
271 const TypeAndOrName &type_and_or_name, ValueObject &static_value) {
272 CompilerType static_type(static_value.GetCompilerType());
273 Flags static_type_flags(static_type.GetTypeInfo());
274
275 TypeAndOrName ret(type_and_or_name);
276 if (type_and_or_name.HasType()) {
277 // The type will always be the type of the dynamic object. If our parent's
278 // type was a pointer, then our type should be a pointer to the type of the
279 // dynamic object. If a reference, then the original type should be
280 // okay...
281 CompilerType orig_type = type_and_or_name.GetCompilerType();
282 CompilerType corrected_type = orig_type;
283 if (static_type_flags.AllSet(eTypeIsPointer))
284 corrected_type = orig_type.GetPointerType();
285 else if (static_type_flags.AllSet(eTypeIsReference))
286 corrected_type = orig_type.GetLValueReferenceType();
287 ret.SetCompilerType(corrected_type);
288 } else {
289 // If we are here we need to adjust our dynamic type name to include the
290 // correct & or * symbol
291 std::string corrected_name(type_and_or_name.GetName().GetCString());
292 if (static_type_flags.AllSet(eTypeIsPointer))
293 corrected_name.append(" *");
294 else if (static_type_flags.AllSet(eTypeIsReference))
295 corrected_name.append(" &");
296 // the parent type should be a correctly pointer'ed or referenc'ed type
297 ret.SetCompilerType(static_type);
298 ret.SetName(corrected_name.c_str());
299 }
300 return ret;
301 }
302
303 // Static Functions
304 LanguageRuntime *
CreateInstance(Process * process,lldb::LanguageType language)305 ItaniumABILanguageRuntime::CreateInstance(Process *process,
306 lldb::LanguageType language) {
307 // FIXME: We have to check the process and make sure we actually know that
308 // this process supports
309 // the Itanium ABI.
310 if (language == eLanguageTypeC_plus_plus ||
311 language == eLanguageTypeC_plus_plus_03 ||
312 language == eLanguageTypeC_plus_plus_11 ||
313 language == eLanguageTypeC_plus_plus_14)
314 return new ItaniumABILanguageRuntime(process);
315 else
316 return nullptr;
317 }
318
319 class CommandObjectMultiwordItaniumABI_Demangle : public CommandObjectParsed {
320 public:
CommandObjectMultiwordItaniumABI_Demangle(CommandInterpreter & interpreter)321 CommandObjectMultiwordItaniumABI_Demangle(CommandInterpreter &interpreter)
322 : CommandObjectParsed(interpreter, "demangle",
323 "Demangle a C++ mangled name.",
324 "language cplusplus demangle") {
325 CommandArgumentEntry arg;
326 CommandArgumentData index_arg;
327
328 // Define the first (and only) variant of this arg.
329 index_arg.arg_type = eArgTypeSymbol;
330 index_arg.arg_repetition = eArgRepeatPlus;
331
332 // There is only one variant this argument could be; put it into the
333 // argument entry.
334 arg.push_back(index_arg);
335
336 // Push the data for the first argument into the m_arguments vector.
337 m_arguments.push_back(arg);
338 }
339
340 ~CommandObjectMultiwordItaniumABI_Demangle() override = default;
341
342 protected:
DoExecute(Args & command,CommandReturnObject & result)343 bool DoExecute(Args &command, CommandReturnObject &result) override {
344 bool demangled_any = false;
345 bool error_any = false;
346 for (auto &entry : command.entries()) {
347 if (entry.ref().empty())
348 continue;
349
350 // the actual Mangled class should be strict about this, but on the
351 // command line if you're copying mangled names out of 'nm' on Darwin,
352 // they will come out with an extra underscore - be willing to strip this
353 // on behalf of the user. This is the moral equivalent of the -_/-n
354 // options to c++filt
355 auto name = entry.ref();
356 if (name.startswith("__Z"))
357 name = name.drop_front();
358
359 Mangled mangled(name);
360 if (mangled.GuessLanguage() == lldb::eLanguageTypeC_plus_plus) {
361 ConstString demangled(
362 mangled.GetDisplayDemangledName(lldb::eLanguageTypeC_plus_plus));
363 demangled_any = true;
364 result.AppendMessageWithFormat("%s ---> %s\n", entry.c_str(),
365 demangled.GetCString());
366 } else {
367 error_any = true;
368 result.AppendErrorWithFormat("%s is not a valid C++ mangled name\n",
369 entry.ref().str().c_str());
370 }
371 }
372
373 result.SetStatus(
374 error_any ? lldb::eReturnStatusFailed
375 : (demangled_any ? lldb::eReturnStatusSuccessFinishResult
376 : lldb::eReturnStatusSuccessFinishNoResult));
377 return result.Succeeded();
378 }
379 };
380
381 class CommandObjectMultiwordItaniumABI : public CommandObjectMultiword {
382 public:
CommandObjectMultiwordItaniumABI(CommandInterpreter & interpreter)383 CommandObjectMultiwordItaniumABI(CommandInterpreter &interpreter)
384 : CommandObjectMultiword(
385 interpreter, "cplusplus",
386 "Commands for operating on the C++ language runtime.",
387 "cplusplus <subcommand> [<subcommand-options>]") {
388 LoadSubCommand(
389 "demangle",
390 CommandObjectSP(
391 new CommandObjectMultiwordItaniumABI_Demangle(interpreter)));
392 }
393
394 ~CommandObjectMultiwordItaniumABI() override = default;
395 };
396
Initialize()397 void ItaniumABILanguageRuntime::Initialize() {
398 PluginManager::RegisterPlugin(
399 GetPluginNameStatic(), "Itanium ABI for the C++ language", CreateInstance,
400 [](CommandInterpreter &interpreter) -> lldb::CommandObjectSP {
401 return CommandObjectSP(
402 new CommandObjectMultiwordItaniumABI(interpreter));
403 });
404 }
405
Terminate()406 void ItaniumABILanguageRuntime::Terminate() {
407 PluginManager::UnregisterPlugin(CreateInstance);
408 }
409
GetPluginNameStatic()410 lldb_private::ConstString ItaniumABILanguageRuntime::GetPluginNameStatic() {
411 static ConstString g_name("itanium");
412 return g_name;
413 }
414
415 // PluginInterface protocol
GetPluginName()416 lldb_private::ConstString ItaniumABILanguageRuntime::GetPluginName() {
417 return GetPluginNameStatic();
418 }
419
GetPluginVersion()420 uint32_t ItaniumABILanguageRuntime::GetPluginVersion() { return 1; }
421
CreateExceptionResolver(Breakpoint * bkpt,bool catch_bp,bool throw_bp)422 BreakpointResolverSP ItaniumABILanguageRuntime::CreateExceptionResolver(
423 Breakpoint *bkpt, bool catch_bp, bool throw_bp) {
424 return CreateExceptionResolver(bkpt, catch_bp, throw_bp, false);
425 }
426
CreateExceptionResolver(Breakpoint * bkpt,bool catch_bp,bool throw_bp,bool for_expressions)427 BreakpointResolverSP ItaniumABILanguageRuntime::CreateExceptionResolver(
428 Breakpoint *bkpt, bool catch_bp, bool throw_bp, bool for_expressions) {
429 // One complication here is that most users DON'T want to stop at
430 // __cxa_allocate_expression, but until we can do anything better with
431 // predicting unwinding the expression parser does. So we have two forms of
432 // the exception breakpoints, one for expressions that leaves out
433 // __cxa_allocate_exception, and one that includes it. The
434 // SetExceptionBreakpoints does the latter, the CreateExceptionBreakpoint in
435 // the runtime the former.
436 static const char *g_catch_name = "__cxa_begin_catch";
437 static const char *g_throw_name1 = "__cxa_throw";
438 static const char *g_throw_name2 = "__cxa_rethrow";
439 static const char *g_exception_throw_name = "__cxa_allocate_exception";
440 std::vector<const char *> exception_names;
441 exception_names.reserve(4);
442 if (catch_bp)
443 exception_names.push_back(g_catch_name);
444
445 if (throw_bp) {
446 exception_names.push_back(g_throw_name1);
447 exception_names.push_back(g_throw_name2);
448 }
449
450 if (for_expressions)
451 exception_names.push_back(g_exception_throw_name);
452
453 BreakpointResolverSP resolver_sp(new BreakpointResolverName(
454 bkpt, exception_names.data(), exception_names.size(),
455 eFunctionNameTypeBase, eLanguageTypeUnknown, 0, eLazyBoolNo));
456
457 return resolver_sp;
458 }
459
CreateExceptionSearchFilter()460 lldb::SearchFilterSP ItaniumABILanguageRuntime::CreateExceptionSearchFilter() {
461 Target &target = m_process->GetTarget();
462
463 FileSpecList filter_modules;
464 if (target.GetArchitecture().GetTriple().getVendor() == llvm::Triple::Apple) {
465 // Limit the number of modules that are searched for these breakpoints for
466 // Apple binaries.
467 filter_modules.EmplaceBack("libc++abi.dylib");
468 filter_modules.EmplaceBack("libSystem.B.dylib");
469 }
470 return target.GetSearchFilterForModuleList(&filter_modules);
471 }
472
CreateExceptionBreakpoint(bool catch_bp,bool throw_bp,bool for_expressions,bool is_internal)473 lldb::BreakpointSP ItaniumABILanguageRuntime::CreateExceptionBreakpoint(
474 bool catch_bp, bool throw_bp, bool for_expressions, bool is_internal) {
475 Target &target = m_process->GetTarget();
476 FileSpecList filter_modules;
477 BreakpointResolverSP exception_resolver_sp =
478 CreateExceptionResolver(nullptr, catch_bp, throw_bp, for_expressions);
479 SearchFilterSP filter_sp(CreateExceptionSearchFilter());
480 const bool hardware = false;
481 const bool resolve_indirect_functions = false;
482 return target.CreateBreakpoint(filter_sp, exception_resolver_sp, is_internal,
483 hardware, resolve_indirect_functions);
484 }
485
SetExceptionBreakpoints()486 void ItaniumABILanguageRuntime::SetExceptionBreakpoints() {
487 if (!m_process)
488 return;
489
490 const bool catch_bp = false;
491 const bool throw_bp = true;
492 const bool is_internal = true;
493 const bool for_expressions = true;
494
495 // For the exception breakpoints set by the Expression parser, we'll be a
496 // little more aggressive and stop at exception allocation as well.
497
498 if (m_cxx_exception_bp_sp) {
499 m_cxx_exception_bp_sp->SetEnabled(true);
500 } else {
501 m_cxx_exception_bp_sp = CreateExceptionBreakpoint(
502 catch_bp, throw_bp, for_expressions, is_internal);
503 if (m_cxx_exception_bp_sp)
504 m_cxx_exception_bp_sp->SetBreakpointKind("c++ exception");
505 }
506 }
507
ClearExceptionBreakpoints()508 void ItaniumABILanguageRuntime::ClearExceptionBreakpoints() {
509 if (!m_process)
510 return;
511
512 if (m_cxx_exception_bp_sp) {
513 m_cxx_exception_bp_sp->SetEnabled(false);
514 }
515 }
516
ExceptionBreakpointsAreSet()517 bool ItaniumABILanguageRuntime::ExceptionBreakpointsAreSet() {
518 return m_cxx_exception_bp_sp && m_cxx_exception_bp_sp->IsEnabled();
519 }
520
ExceptionBreakpointsExplainStop(lldb::StopInfoSP stop_reason)521 bool ItaniumABILanguageRuntime::ExceptionBreakpointsExplainStop(
522 lldb::StopInfoSP stop_reason) {
523 if (!m_process)
524 return false;
525
526 if (!stop_reason || stop_reason->GetStopReason() != eStopReasonBreakpoint)
527 return false;
528
529 uint64_t break_site_id = stop_reason->GetValue();
530 return m_process->GetBreakpointSiteList().BreakpointSiteContainsBreakpoint(
531 break_site_id, m_cxx_exception_bp_sp->GetID());
532 }
533
GetExceptionObjectForThread(ThreadSP thread_sp)534 ValueObjectSP ItaniumABILanguageRuntime::GetExceptionObjectForThread(
535 ThreadSP thread_sp) {
536 if (!thread_sp->SafeToCallFunctions())
537 return {};
538
539 ClangASTContext *clang_ast_context =
540 ClangASTContext::GetScratch(m_process->GetTarget());
541 if (!clang_ast_context)
542 return {};
543
544 CompilerType voidstar =
545 clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
546
547 DiagnosticManager diagnostics;
548 ExecutionContext exe_ctx;
549 EvaluateExpressionOptions options;
550
551 options.SetUnwindOnError(true);
552 options.SetIgnoreBreakpoints(true);
553 options.SetStopOthers(true);
554 options.SetTimeout(m_process->GetUtilityExpressionTimeout());
555 options.SetTryAllThreads(false);
556 thread_sp->CalculateExecutionContext(exe_ctx);
557
558 const ModuleList &modules = m_process->GetTarget().GetImages();
559 SymbolContextList contexts;
560 SymbolContext context;
561
562 modules.FindSymbolsWithNameAndType(
563 ConstString("__cxa_current_exception_type"), eSymbolTypeCode, contexts);
564 contexts.GetContextAtIndex(0, context);
565 if (!context.symbol) {
566 return {};
567 }
568 Address addr = context.symbol->GetAddress();
569
570 Status error;
571 FunctionCaller *function_caller =
572 m_process->GetTarget().GetFunctionCallerForLanguage(
573 eLanguageTypeC, voidstar, addr, ValueList(), "caller", error);
574
575 ExpressionResults func_call_ret;
576 Value results;
577 func_call_ret = function_caller->ExecuteFunction(exe_ctx, nullptr, options,
578 diagnostics, results);
579 if (func_call_ret != eExpressionCompleted || !error.Success()) {
580 return ValueObjectSP();
581 }
582
583 size_t ptr_size = m_process->GetAddressByteSize();
584 addr_t result_ptr = results.GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
585 addr_t exception_addr =
586 m_process->ReadPointerFromMemory(result_ptr - ptr_size, error);
587
588 if (!error.Success()) {
589 return ValueObjectSP();
590 }
591
592 lldb_private::formatters::InferiorSizedWord exception_isw(exception_addr,
593 *m_process);
594 ValueObjectSP exception = ValueObject::CreateValueObjectFromData(
595 "exception", exception_isw.GetAsData(m_process->GetByteOrder()), exe_ctx,
596 voidstar);
597 exception = exception->GetDynamicValue(eDynamicDontRunTarget);
598
599 return exception;
600 }
601
GetDynamicTypeInfo(const lldb_private::Address & vtable_addr)602 TypeAndOrName ItaniumABILanguageRuntime::GetDynamicTypeInfo(
603 const lldb_private::Address &vtable_addr) {
604 std::lock_guard<std::mutex> locker(m_dynamic_type_map_mutex);
605 DynamicTypeCache::const_iterator pos = m_dynamic_type_map.find(vtable_addr);
606 if (pos == m_dynamic_type_map.end())
607 return TypeAndOrName();
608 else
609 return pos->second;
610 }
611
SetDynamicTypeInfo(const lldb_private::Address & vtable_addr,const TypeAndOrName & type_info)612 void ItaniumABILanguageRuntime::SetDynamicTypeInfo(
613 const lldb_private::Address &vtable_addr, const TypeAndOrName &type_info) {
614 std::lock_guard<std::mutex> locker(m_dynamic_type_map_mutex);
615 m_dynamic_type_map[vtable_addr] = type_info;
616 }
617