1//===-- IRExecutionUnit.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 "llvm/ExecutionEngine/ExecutionEngine.h"
10#include "llvm/ExecutionEngine/ObjectCache.h"
11#include "llvm/IR/Constants.h"
12#include "llvm/IR/DiagnosticHandler.h"
13#include "llvm/IR/DiagnosticInfo.h"
14#include "llvm/IR/LLVMContext.h"
15#include "llvm/IR/Module.h"
16#include "llvm/Support/SourceMgr.h"
17#include "llvm/Support/raw_ostream.h"
18
19#include "lldb/Core/Debugger.h"
20#include "lldb/Core/Disassembler.h"
21#include "lldb/Core/Module.h"
22#include "lldb/Core/Section.h"
23#include "lldb/Expression/IRExecutionUnit.h"
24#include "lldb/Expression/ObjectFileJIT.h"
25#include "lldb/Host/HostInfo.h"
26#include "lldb/Symbol/CompileUnit.h"
27#include "lldb/Symbol/SymbolContext.h"
28#include "lldb/Symbol/SymbolFile.h"
29#include "lldb/Symbol/SymbolVendor.h"
30#include "lldb/Target/ExecutionContext.h"
31#include "lldb/Target/Language.h"
32#include "lldb/Target/LanguageRuntime.h"
33#include "lldb/Target/Target.h"
34#include "lldb/Utility/DataBufferHeap.h"
35#include "lldb/Utility/DataExtractor.h"
36#include "lldb/Utility/LLDBAssert.h"
37#include "lldb/Utility/LLDBLog.h"
38#include "lldb/Utility/Log.h"
39
40#include <optional>
41
42using namespace lldb_private;
43
44IRExecutionUnit::IRExecutionUnit(std::unique_ptr<llvm::LLVMContext> &context_up,
45 std::unique_ptr<llvm::Module> &module_up,
46 ConstString &name,
47 const lldb::TargetSP &target_sp,
48 const SymbolContext &sym_ctx,
49 std::vector<std::string> &cpu_features)
50 : IRMemoryMap(target_sp), m_context_up(context_up.release()),
51 m_module_up(module_up.release()), m_module(m_module_up.get()),
52 m_cpu_features(cpu_features), m_name(name), m_sym_ctx(sym_ctx),
53 m_did_jit(false), m_function_load_addr(LLDB_INVALID_ADDRESS),
54 m_function_end_load_addr(LLDB_INVALID_ADDRESS),
55 m_reported_allocations(false), m_preferred_modules() {}
56
57lldb::addr_t IRExecutionUnit::WriteNow(const uint8_t *bytes, size_t size,
58 Status &error) {
59 const bool zero_memory = false;
60 lldb::addr_t allocation_process_addr =
61 Malloc(size, alignment: 8, permissions: lldb::ePermissionsWritable | lldb::ePermissionsReadable,
62 policy: eAllocationPolicyMirror, zero_memory, error);
63
64 if (!error.Success())
65 return LLDB_INVALID_ADDRESS;
66
67 WriteMemory(process_address: allocation_process_addr, bytes, size, error);
68
69 if (!error.Success()) {
70 Status err;
71 Free(process_address: allocation_process_addr, error&: err);
72
73 return LLDB_INVALID_ADDRESS;
74 }
75
76 if (Log *log = GetLog(mask: LLDBLog::Expressions)) {
77 DataBufferHeap my_buffer(size, 0);
78 Status err;
79 ReadMemory(bytes: my_buffer.GetBytes(), process_address: allocation_process_addr, size, error&: err);
80
81 if (err.Success()) {
82 DataExtractor my_extractor(my_buffer.GetBytes(), my_buffer.GetByteSize(),
83 lldb::eByteOrderBig, 8);
84 my_extractor.PutToLog(log, offset: 0, length: my_buffer.GetByteSize(),
85 base_addr: allocation_process_addr, num_per_line: 16,
86 type: DataExtractor::TypeUInt8);
87 }
88 }
89
90 return allocation_process_addr;
91}
92
93void IRExecutionUnit::FreeNow(lldb::addr_t allocation) {
94 if (allocation == LLDB_INVALID_ADDRESS)
95 return;
96
97 Status err;
98
99 Free(process_address: allocation, error&: err);
100}
101
102Status IRExecutionUnit::DisassembleFunction(Stream &stream,
103 lldb::ProcessSP &process_wp) {
104 Log *log = GetLog(mask: LLDBLog::Expressions);
105
106 ExecutionContext exe_ctx(process_wp);
107
108 Status ret;
109
110 ret.Clear();
111
112 lldb::addr_t func_local_addr = LLDB_INVALID_ADDRESS;
113 lldb::addr_t func_remote_addr = LLDB_INVALID_ADDRESS;
114
115 for (JittedFunction &function : m_jitted_functions) {
116 if (function.m_name == m_name) {
117 func_local_addr = function.m_local_addr;
118 func_remote_addr = function.m_remote_addr;
119 }
120 }
121
122 if (func_local_addr == LLDB_INVALID_ADDRESS) {
123 ret = Status::FromErrorStringWithFormat(
124 format: "Couldn't find function %s for disassembly", m_name.AsCString());
125 return ret;
126 }
127
128 LLDB_LOGF(log,
129 "Found function, has local address 0x%" PRIx64
130 " and remote address 0x%" PRIx64,
131 (uint64_t)func_local_addr, (uint64_t)func_remote_addr);
132
133 std::pair<lldb::addr_t, lldb::addr_t> func_range;
134
135 func_range = GetRemoteRangeForLocal(local_address: func_local_addr);
136
137 if (func_range.first == 0 && func_range.second == 0) {
138 ret = Status::FromErrorStringWithFormat(
139 format: "Couldn't find code range for function %s", m_name.AsCString());
140 return ret;
141 }
142
143 LLDB_LOGF(log, "Function's code range is [0x%" PRIx64 "+0x%" PRIx64 "]",
144 func_range.first, func_range.second);
145
146 Target *target = exe_ctx.GetTargetPtr();
147 if (!target) {
148 ret = Status::FromErrorString(str: "Couldn't find the target");
149 return ret;
150 }
151
152 lldb::WritableDataBufferSP buffer_sp(
153 new DataBufferHeap(func_range.second, 0));
154
155 Process *process = exe_ctx.GetProcessPtr();
156 Status err;
157 process->ReadMemory(vm_addr: func_remote_addr, buf: buffer_sp->GetBytes(),
158 size: buffer_sp->GetByteSize(), error&: err);
159
160 if (!err.Success()) {
161 ret = Status::FromErrorStringWithFormat(format: "Couldn't read from process: %s",
162 err.AsCString(default_error_str: "unknown error"));
163 return ret;
164 }
165
166 ArchSpec arch(target->GetArchitecture());
167
168 const char *plugin_name = nullptr;
169 const char *flavor_string = nullptr;
170 const char *cpu_string = nullptr;
171 const char *features_string = nullptr;
172 lldb::DisassemblerSP disassembler_sp = Disassembler::FindPlugin(
173 arch, flavor: flavor_string, cpu: cpu_string, features: features_string, plugin_name);
174
175 if (!disassembler_sp) {
176 ret = Status::FromErrorStringWithFormat(
177 format: "Unable to find disassembler plug-in for %s architecture.",
178 arch.GetArchitectureName());
179 return ret;
180 }
181
182 if (!process) {
183 ret = Status::FromErrorString(str: "Couldn't find the process");
184 return ret;
185 }
186
187 DataExtractor extractor(buffer_sp, process->GetByteOrder(),
188 target->GetArchitecture().GetAddressByteSize());
189
190 if (log) {
191 LLDB_LOGF(log, "Function data has contents:");
192 extractor.PutToLog(log, offset: 0, length: extractor.GetByteSize(), base_addr: func_remote_addr, num_per_line: 16,
193 type: DataExtractor::TypeUInt8);
194 }
195
196 disassembler_sp->DecodeInstructions(base_addr: Address(func_remote_addr), data: extractor, data_offset: 0,
197 UINT32_MAX, append: false, data_from_file: false);
198
199 InstructionList &instruction_list = disassembler_sp->GetInstructionList();
200 instruction_list.Dump(s: &stream, show_address: true, show_bytes: true, /*show_control_flow_kind=*/false,
201 exe_ctx: &exe_ctx);
202
203 return ret;
204}
205
206namespace {
207struct IRExecDiagnosticHandler : public llvm::DiagnosticHandler {
208 Status *err;
209 IRExecDiagnosticHandler(Status *err) : err(err) {}
210 bool handleDiagnostics(const llvm::DiagnosticInfo &DI) override {
211 if (DI.getSeverity() == llvm::DS_Error) {
212 const auto &DISM = llvm::cast<llvm::DiagnosticInfoSrcMgr>(Val: DI);
213 if (err && err->Success()) {
214 *err = Status::FromErrorStringWithFormat(
215 format: "IRExecution error: %s",
216 DISM.getSMDiag().getMessage().str().c_str());
217 }
218 }
219
220 return true;
221 }
222};
223} // namespace
224
225void IRExecutionUnit::ReportSymbolLookupError(ConstString name) {
226 m_failed_lookups.push_back(x: name);
227}
228
229void IRExecutionUnit::GetRunnableInfo(Status &error, lldb::addr_t &func_addr,
230 lldb::addr_t &func_end) {
231 lldb::ProcessSP process_sp(GetProcessWP().lock());
232
233 static std::recursive_mutex s_runnable_info_mutex;
234
235 func_addr = LLDB_INVALID_ADDRESS;
236 func_end = LLDB_INVALID_ADDRESS;
237
238 if (!process_sp) {
239 error =
240 Status::FromErrorString(str: "Couldn't write the JIT compiled code into the "
241 "process because the process is invalid");
242 return;
243 }
244
245 if (m_did_jit) {
246 func_addr = m_function_load_addr;
247 func_end = m_function_end_load_addr;
248
249 return;
250 };
251
252 std::lock_guard<std::recursive_mutex> guard(s_runnable_info_mutex);
253
254 m_did_jit = true;
255
256 Log *log = GetLog(mask: LLDBLog::Expressions);
257
258 std::string error_string;
259
260 if (log) {
261 std::string s;
262 llvm::raw_string_ostream oss(s);
263
264 m_module->print(OS&: oss, AAW: nullptr);
265
266 LLDB_LOGF(log, "Module being sent to JIT: \n%s", s.c_str());
267 }
268
269 m_module_up->getContext().setDiagnosticHandler(
270 DH: std::make_unique<IRExecDiagnosticHandler>(args: &error));
271
272 llvm::EngineBuilder builder(std::move(m_module_up));
273 llvm::Triple triple(m_module->getTargetTriple());
274
275 builder.setEngineKind(llvm::EngineKind::JIT)
276 .setErrorStr(&error_string)
277 .setRelocationModel(triple.isOSBinFormatMachO() ? llvm::Reloc::PIC_
278 : llvm::Reloc::Static)
279 .setMCJITMemoryManager(std::make_unique<MemoryManager>(args&: *this))
280 .setOptLevel(llvm::CodeGenOptLevel::Less);
281
282 // Resulted jitted code can be placed too far from the code in the binary
283 // and thus can contain more than +-2GB jumps, that are not available
284 // in RISC-V without large code model.
285 if (triple.isRISCV64())
286 builder.setCodeModel(llvm::CodeModel::Large);
287
288 llvm::StringRef mArch;
289 llvm::StringRef mCPU;
290 llvm::SmallVector<std::string, 0> mAttrs;
291
292 for (std::string &feature : m_cpu_features)
293 mAttrs.push_back(Elt: feature);
294
295 llvm::TargetMachine *target_machine =
296 builder.selectTarget(TargetTriple: triple, MArch: mArch, MCPU: mCPU, MAttrs: mAttrs);
297
298 m_execution_engine_up.reset(p: builder.create(TM: target_machine));
299
300 if (!m_execution_engine_up) {
301 error = Status::FromErrorStringWithFormat(format: "Couldn't JIT the function: %s",
302 error_string.c_str());
303 return;
304 }
305
306 m_strip_underscore =
307 (m_execution_engine_up->getDataLayout().getGlobalPrefix() == '_');
308
309 class ObjectDumper : public llvm::ObjectCache {
310 public:
311 ObjectDumper(FileSpec output_dir) : m_out_dir(output_dir) {}
312 void notifyObjectCompiled(const llvm::Module *module,
313 llvm::MemoryBufferRef object) override {
314 int fd = 0;
315 llvm::SmallVector<char, 256> result_path;
316 std::string object_name_model =
317 "jit-object-" + module->getModuleIdentifier() + "-%%%.o";
318 FileSpec model_spec
319 = m_out_dir.CopyByAppendingPathComponent(component: object_name_model);
320 std::string model_path = model_spec.GetPath();
321
322 std::error_code result
323 = llvm::sys::fs::createUniqueFile(Model: model_path, ResultFD&: fd, ResultPath&: result_path);
324 if (!result) {
325 llvm::raw_fd_ostream fds(fd, true);
326 fds.write(Ptr: object.getBufferStart(), Size: object.getBufferSize());
327 }
328 }
329 std::unique_ptr<llvm::MemoryBuffer>
330 getObject(const llvm::Module *module) override {
331 // Return nothing - we're just abusing the object-cache mechanism to dump
332 // objects.
333 return nullptr;
334 }
335 private:
336 FileSpec m_out_dir;
337 };
338
339 FileSpec save_objects_dir = process_sp->GetTarget().GetSaveJITObjectsDir();
340 if (save_objects_dir) {
341 m_object_cache_up = std::make_unique<ObjectDumper>(args&: save_objects_dir);
342 m_execution_engine_up->setObjectCache(m_object_cache_up.get());
343 }
344
345 // Make sure we see all sections, including ones that don't have
346 // relocations...
347 m_execution_engine_up->setProcessAllSections(true);
348
349 m_execution_engine_up->DisableLazyCompilation();
350
351 for (llvm::Function &function : *m_module) {
352 if (function.isDeclaration() || function.hasPrivateLinkage())
353 continue;
354
355 const bool external = !function.hasLocalLinkage();
356
357 void *fun_ptr = m_execution_engine_up->getPointerToFunction(F: &function);
358
359 if (!error.Success()) {
360 // We got an error through our callback!
361 return;
362 }
363
364 if (!fun_ptr) {
365 error = Status::FromErrorStringWithFormat(
366 format: "'%s' was in the JITted module but wasn't lowered",
367 function.getName().str().c_str());
368 return;
369 }
370 m_jitted_functions.push_back(x: JittedFunction(
371 function.getName().str().c_str(), external, reinterpret_cast<uintptr_t>(fun_ptr)));
372 }
373
374 CommitAllocations(process_sp);
375 ReportAllocations(engine&: *m_execution_engine_up);
376
377 // We have to do this after calling ReportAllocations because for the MCJIT,
378 // getGlobalValueAddress will cause the JIT to perform all relocations. That
379 // can only be done once, and has to happen after we do the remapping from
380 // local -> remote. That means we don't know the local address of the
381 // Variables, but we don't need that for anything, so that's okay.
382
383 std::function<void(llvm::GlobalValue &)> RegisterOneValue = [this](
384 llvm::GlobalValue &val) {
385 if (val.hasExternalLinkage() && !val.isDeclaration()) {
386 uint64_t var_ptr_addr =
387 m_execution_engine_up->getGlobalValueAddress(Name: val.getName().str());
388
389 lldb::addr_t remote_addr = GetRemoteAddressForLocal(local_address: var_ptr_addr);
390
391 // This is a really unfortunae API that sometimes returns local addresses
392 // and sometimes returns remote addresses, based on whether the variable
393 // was relocated during ReportAllocations or not.
394
395 if (remote_addr == LLDB_INVALID_ADDRESS) {
396 remote_addr = var_ptr_addr;
397 }
398
399 if (var_ptr_addr != 0)
400 m_jitted_global_variables.push_back(x: JittedGlobalVariable(
401 val.getName().str().c_str(), LLDB_INVALID_ADDRESS, remote_addr));
402 }
403 };
404
405 for (llvm::GlobalVariable &global_var : m_module->globals()) {
406 RegisterOneValue(global_var);
407 }
408
409 for (llvm::GlobalAlias &global_alias : m_module->aliases()) {
410 RegisterOneValue(global_alias);
411 }
412
413 WriteData(process_sp);
414
415 if (m_failed_lookups.size()) {
416 StreamString ss;
417
418 ss.PutCString(cstr: "Couldn't look up symbols:\n");
419
420 bool emitNewLine = false;
421
422 for (ConstString failed_lookup : m_failed_lookups) {
423 if (emitNewLine)
424 ss.PutCString(cstr: "\n");
425 emitNewLine = true;
426 ss.PutCString(cstr: " ");
427 ss.PutCString(cstr: Mangled(failed_lookup).GetDemangledName().GetStringRef());
428 }
429
430 m_failed_lookups.clear();
431 ss.PutCString(
432 cstr: "\nHint: The expression tried to call a function that is not present "
433 "in the target, perhaps because it was optimized out by the compiler.");
434 error = Status(ss.GetString().str());
435
436 return;
437 }
438
439 m_function_load_addr = LLDB_INVALID_ADDRESS;
440 m_function_end_load_addr = LLDB_INVALID_ADDRESS;
441
442 for (JittedFunction &jitted_function : m_jitted_functions) {
443 jitted_function.m_remote_addr =
444 GetRemoteAddressForLocal(local_address: jitted_function.m_local_addr);
445
446 if (!m_name.IsEmpty() && jitted_function.m_name == m_name) {
447 AddrRange func_range =
448 GetRemoteRangeForLocal(local_address: jitted_function.m_local_addr);
449 m_function_end_load_addr = func_range.first + func_range.second;
450 m_function_load_addr = jitted_function.m_remote_addr;
451 }
452 }
453
454 if (log) {
455 LLDB_LOGF(log, "Code can be run in the target.");
456
457 StreamString disassembly_stream;
458
459 Status err = DisassembleFunction(stream&: disassembly_stream, process_wp&: process_sp);
460
461 if (!err.Success()) {
462 LLDB_LOGF(log, "Couldn't disassemble function : %s",
463 err.AsCString("unknown error"));
464 } else {
465 LLDB_LOGF(log, "Function disassembly:\n%s", disassembly_stream.GetData());
466 }
467
468 LLDB_LOGF(log, "Sections: ");
469 for (AllocationRecord &record : m_records) {
470 if (record.m_process_address != LLDB_INVALID_ADDRESS) {
471 record.dump(log);
472
473 DataBufferHeap my_buffer(record.m_size, 0);
474 Status err;
475 ReadMemory(bytes: my_buffer.GetBytes(), process_address: record.m_process_address,
476 size: record.m_size, error&: err);
477
478 if (err.Success()) {
479 DataExtractor my_extractor(my_buffer.GetBytes(),
480 my_buffer.GetByteSize(),
481 lldb::eByteOrderBig, 8);
482 my_extractor.PutToLog(log, offset: 0, length: my_buffer.GetByteSize(),
483 base_addr: record.m_process_address, num_per_line: 16,
484 type: DataExtractor::TypeUInt8);
485 }
486 } else {
487 record.dump(log);
488
489 DataExtractor my_extractor((const void *)record.m_host_address,
490 record.m_size, lldb::eByteOrderBig, 8);
491 my_extractor.PutToLog(log, offset: 0, length: record.m_size, base_addr: record.m_host_address, num_per_line: 16,
492 type: DataExtractor::TypeUInt8);
493 }
494 }
495 }
496
497 func_addr = m_function_load_addr;
498 func_end = m_function_end_load_addr;
499}
500
501IRExecutionUnit::~IRExecutionUnit() {
502 m_module_up.reset();
503 m_execution_engine_up.reset();
504 m_context_up.reset();
505}
506
507IRExecutionUnit::MemoryManager::MemoryManager(IRExecutionUnit &parent)
508 : m_default_mm_up(new llvm::SectionMemoryManager()), m_parent(parent) {}
509
510IRExecutionUnit::MemoryManager::~MemoryManager() = default;
511
512lldb::SectionType IRExecutionUnit::GetSectionTypeFromSectionName(
513 const llvm::StringRef &name, IRExecutionUnit::AllocationKind alloc_kind) {
514 lldb::SectionType sect_type = lldb::eSectionTypeCode;
515 switch (alloc_kind) {
516 case AllocationKind::Stub:
517 sect_type = lldb::eSectionTypeCode;
518 break;
519 case AllocationKind::Code:
520 sect_type = lldb::eSectionTypeCode;
521 break;
522 case AllocationKind::Data:
523 sect_type = lldb::eSectionTypeData;
524 break;
525 case AllocationKind::Global:
526 sect_type = lldb::eSectionTypeData;
527 break;
528 case AllocationKind::Bytes:
529 sect_type = lldb::eSectionTypeOther;
530 break;
531 }
532
533 if (!name.empty()) {
534 if (name == "__text" || name == ".text")
535 sect_type = lldb::eSectionTypeCode;
536 else if (name == "__data" || name == ".data")
537 sect_type = lldb::eSectionTypeCode;
538 else if (name.starts_with(Prefix: "__debug_") || name.starts_with(Prefix: ".debug_")) {
539 const uint32_t name_idx = name[0] == '_' ? 8 : 7;
540 llvm::StringRef dwarf_name(name.substr(Start: name_idx));
541 switch (dwarf_name[0]) {
542 case 'a':
543 if (dwarf_name == "abbrev")
544 sect_type = lldb::eSectionTypeDWARFDebugAbbrev;
545 else if (dwarf_name == "aranges")
546 sect_type = lldb::eSectionTypeDWARFDebugAranges;
547 else if (dwarf_name == "addr")
548 sect_type = lldb::eSectionTypeDWARFDebugAddr;
549 break;
550
551 case 'f':
552 if (dwarf_name == "frame")
553 sect_type = lldb::eSectionTypeDWARFDebugFrame;
554 break;
555
556 case 'i':
557 if (dwarf_name == "info")
558 sect_type = lldb::eSectionTypeDWARFDebugInfo;
559 break;
560
561 case 'l':
562 if (dwarf_name == "line")
563 sect_type = lldb::eSectionTypeDWARFDebugLine;
564 else if (dwarf_name == "loc")
565 sect_type = lldb::eSectionTypeDWARFDebugLoc;
566 else if (dwarf_name == "loclists")
567 sect_type = lldb::eSectionTypeDWARFDebugLocLists;
568 break;
569
570 case 'm':
571 if (dwarf_name == "macinfo")
572 sect_type = lldb::eSectionTypeDWARFDebugMacInfo;
573 break;
574
575 case 'p':
576 if (dwarf_name == "pubnames")
577 sect_type = lldb::eSectionTypeDWARFDebugPubNames;
578 else if (dwarf_name == "pubtypes")
579 sect_type = lldb::eSectionTypeDWARFDebugPubTypes;
580 break;
581
582 case 's':
583 if (dwarf_name == "str")
584 sect_type = lldb::eSectionTypeDWARFDebugStr;
585 else if (dwarf_name == "str_offsets")
586 sect_type = lldb::eSectionTypeDWARFDebugStrOffsets;
587 break;
588
589 case 'r':
590 if (dwarf_name == "ranges")
591 sect_type = lldb::eSectionTypeDWARFDebugRanges;
592 break;
593
594 default:
595 break;
596 }
597 } else if (name.starts_with(Prefix: "__apple_") || name.starts_with(Prefix: ".apple_"))
598 sect_type = lldb::eSectionTypeInvalid;
599 else if (name == "__objc_imageinfo")
600 sect_type = lldb::eSectionTypeOther;
601 }
602 return sect_type;
603}
604
605uint8_t *IRExecutionUnit::MemoryManager::allocateCodeSection(
606 uintptr_t Size, unsigned Alignment, unsigned SectionID,
607 llvm::StringRef SectionName) {
608 Log *log = GetLog(mask: LLDBLog::Expressions);
609
610 uint8_t *return_value = m_default_mm_up->allocateCodeSection(
611 Size, Alignment, SectionID, SectionName);
612
613 m_parent.m_records.push_back(x: AllocationRecord(
614 (uintptr_t)return_value,
615 lldb::ePermissionsReadable | lldb::ePermissionsExecutable,
616 GetSectionTypeFromSectionName(name: SectionName, alloc_kind: AllocationKind::Code), Size,
617 Alignment, SectionID, SectionName.str().c_str()));
618
619 LLDB_LOGF(log,
620 "IRExecutionUnit::allocateCodeSection(Size=0x%" PRIx64
621 ", Alignment=%u, SectionID=%u) = %p",
622 (uint64_t)Size, Alignment, SectionID, (void *)return_value);
623
624 if (m_parent.m_reported_allocations) {
625 Status err;
626 lldb::ProcessSP process_sp =
627 m_parent.GetBestExecutionContextScope()->CalculateProcess();
628
629 m_parent.CommitOneAllocation(process_sp, error&: err, record&: m_parent.m_records.back());
630 }
631
632 return return_value;
633}
634
635uint8_t *IRExecutionUnit::MemoryManager::allocateDataSection(
636 uintptr_t Size, unsigned Alignment, unsigned SectionID,
637 llvm::StringRef SectionName, bool IsReadOnly) {
638 Log *log = GetLog(mask: LLDBLog::Expressions);
639
640 uint8_t *return_value = m_default_mm_up->allocateDataSection(
641 Size, Alignment, SectionID, SectionName, isReadOnly: IsReadOnly);
642
643 uint32_t permissions = lldb::ePermissionsReadable;
644 if (!IsReadOnly)
645 permissions |= lldb::ePermissionsWritable;
646 m_parent.m_records.push_back(x: AllocationRecord(
647 (uintptr_t)return_value, permissions,
648 GetSectionTypeFromSectionName(name: SectionName, alloc_kind: AllocationKind::Data), Size,
649 Alignment, SectionID, SectionName.str().c_str()));
650 LLDB_LOGF(log,
651 "IRExecutionUnit::allocateDataSection(Size=0x%" PRIx64
652 ", Alignment=%u, SectionID=%u) = %p",
653 (uint64_t)Size, Alignment, SectionID, (void *)return_value);
654
655 if (m_parent.m_reported_allocations) {
656 Status err;
657 lldb::ProcessSP process_sp =
658 m_parent.GetBestExecutionContextScope()->CalculateProcess();
659
660 m_parent.CommitOneAllocation(process_sp, error&: err, record&: m_parent.m_records.back());
661 }
662
663 return return_value;
664}
665
666void IRExecutionUnit::CollectCandidateCNames(std::vector<ConstString> &C_names,
667 ConstString name) {
668 if (m_strip_underscore && name.AsCString()[0] == '_')
669 C_names.insert(position: C_names.begin(), x: ConstString(&name.AsCString()[1]));
670 C_names.push_back(x: name);
671}
672
673void IRExecutionUnit::CollectCandidateCPlusPlusNames(
674 std::vector<ConstString> &CPP_names,
675 const std::vector<ConstString> &C_names, const SymbolContext &sc) {
676 if (auto *cpp_lang = Language::FindPlugin(language: lldb::eLanguageTypeC_plus_plus)) {
677 for (const ConstString &name : C_names) {
678 Mangled mangled(name);
679 if (cpp_lang->SymbolNameFitsToLanguage(name: mangled)) {
680 if (ConstString best_alternate =
681 cpp_lang->FindBestAlternateFunctionMangledName(mangled, sym_ctx: sc)) {
682 CPP_names.push_back(x: best_alternate);
683 }
684 }
685
686 std::vector<ConstString> alternates =
687 cpp_lang->GenerateAlternateFunctionManglings(mangled: name);
688 CPP_names.insert(position: CPP_names.end(), first: alternates.begin(), last: alternates.end());
689
690 // As a last-ditch fallback, try the base name for C++ names. It's
691 // terrible, but the DWARF doesn't always encode "extern C" correctly.
692 ConstString basename =
693 cpp_lang->GetDemangledFunctionNameWithoutArguments(mangled);
694 CPP_names.push_back(x: basename);
695 }
696 }
697}
698
699class LoadAddressResolver {
700public:
701 LoadAddressResolver(Target *target, bool &symbol_was_missing_weak)
702 : m_target(target), m_symbol_was_missing_weak(symbol_was_missing_weak) {}
703
704 std::optional<lldb::addr_t> Resolve(SymbolContextList &sc_list) {
705 if (sc_list.IsEmpty())
706 return std::nullopt;
707
708 lldb::addr_t load_address = LLDB_INVALID_ADDRESS;
709
710 // Missing_weak_symbol will be true only if we found only weak undefined
711 // references to this symbol.
712 m_symbol_was_missing_weak = true;
713
714 for (auto candidate_sc : sc_list.SymbolContexts()) {
715 // Only symbols can be weak undefined.
716 if (!candidate_sc.symbol ||
717 candidate_sc.symbol->GetType() != lldb::eSymbolTypeUndefined ||
718 !candidate_sc.symbol->IsWeak())
719 m_symbol_was_missing_weak = false;
720
721 // First try the symbol.
722 if (candidate_sc.symbol) {
723 load_address = candidate_sc.symbol->ResolveCallableAddress(target&: *m_target);
724 if (load_address == LLDB_INVALID_ADDRESS) {
725 Address addr = candidate_sc.symbol->GetAddress();
726 load_address = m_target->GetProcessSP()
727 ? addr.GetLoadAddress(target: m_target)
728 : addr.GetFileAddress();
729 }
730 }
731
732 // If that didn't work, try the function.
733 if (load_address == LLDB_INVALID_ADDRESS && candidate_sc.function) {
734 Address addr = candidate_sc.function->GetAddress();
735 load_address = m_target->GetProcessSP() ? addr.GetLoadAddress(target: m_target)
736 : addr.GetFileAddress();
737 }
738
739 // We found a load address.
740 if (load_address != LLDB_INVALID_ADDRESS) {
741 // If the load address is external, we're done.
742 const bool is_external =
743 (candidate_sc.function) ||
744 (candidate_sc.symbol && candidate_sc.symbol->IsExternal());
745 if (is_external)
746 return load_address;
747
748 // Otherwise, remember the best internal load address.
749 if (m_best_internal_load_address == LLDB_INVALID_ADDRESS)
750 m_best_internal_load_address = load_address;
751 }
752 }
753
754 // You test the address of a weak symbol against NULL to see if it is
755 // present. So we should return 0 for a missing weak symbol.
756 if (m_symbol_was_missing_weak)
757 return 0;
758
759 return std::nullopt;
760 }
761
762 lldb::addr_t GetBestInternalLoadAddress() const {
763 return m_best_internal_load_address;
764 }
765
766private:
767 Target *m_target;
768 bool &m_symbol_was_missing_weak;
769 lldb::addr_t m_best_internal_load_address = LLDB_INVALID_ADDRESS;
770};
771
772lldb::addr_t
773IRExecutionUnit::FindInSymbols(const std::vector<ConstString> &names,
774 const lldb_private::SymbolContext &sc,
775 bool &symbol_was_missing_weak) {
776 symbol_was_missing_weak = false;
777
778 Target *target = sc.target_sp.get();
779 if (!target) {
780 // We shouldn't be doing any symbol lookup at all without a target.
781 return LLDB_INVALID_ADDRESS;
782 }
783
784 ModuleList non_local_images = target->GetImages();
785 // We'll process module_sp and any preferred modules separately, before the
786 // other modules.
787 non_local_images.Remove(module_sp: sc.module_sp);
788 for (size_t i = 0; i < m_preferred_modules.GetSize(); ++i)
789 non_local_images.Remove(module_sp: m_preferred_modules.GetModuleAtIndex(idx: i));
790
791 LoadAddressResolver resolver(target, symbol_was_missing_weak);
792
793 ModuleFunctionSearchOptions function_options;
794 function_options.include_symbols = true;
795 function_options.include_inlines = false;
796
797 for (const ConstString &name : names) {
798 // The lookup order here is as follows:
799 // 1) Functions in `sc.module_sp`
800 // 2) Functions in the preferred modules list
801 // 3) Functions in the other modules
802 // 4) Symbols in `sc.module_sp`
803 // 5) Symbols in the preferred modules list
804 // 6) Symbols in the other modules
805 if (sc.module_sp) {
806 SymbolContextList sc_list;
807 sc.module_sp->FindFunctions(name, parent_decl_ctx: CompilerDeclContext(),
808 name_type_mask: lldb::eFunctionNameTypeFull, options: function_options,
809 sc_list);
810 if (auto load_addr = resolver.Resolve(sc_list))
811 return *load_addr;
812 }
813
814 {
815 SymbolContextList sc_list;
816 m_preferred_modules.FindFunctions(name, name_type_mask: lldb::eFunctionNameTypeFull,
817 options: function_options, sc_list);
818 if (auto load_addr = resolver.Resolve(sc_list))
819 return *load_addr;
820 }
821
822 {
823 SymbolContextList sc_list;
824 non_local_images.FindFunctions(name, name_type_mask: lldb::eFunctionNameTypeFull,
825 options: function_options, sc_list);
826 if (auto load_addr = resolver.Resolve(sc_list))
827 return *load_addr;
828 }
829
830 if (sc.module_sp) {
831 SymbolContextList sc_list;
832 sc.module_sp->FindSymbolsWithNameAndType(name, symbol_type: lldb::eSymbolTypeAny,
833 sc_list);
834 if (auto load_addr = resolver.Resolve(sc_list))
835 return *load_addr;
836 }
837
838 {
839 SymbolContextList sc_list;
840 m_preferred_modules.FindSymbolsWithNameAndType(name, symbol_type: lldb::eSymbolTypeAny,
841 sc_list);
842 if (auto load_addr = resolver.Resolve(sc_list))
843 return *load_addr;
844 }
845
846 {
847 SymbolContextList sc_list;
848 non_local_images.FindSymbolsWithNameAndType(name, symbol_type: lldb::eSymbolTypeAny,
849 sc_list);
850 if (auto load_addr = resolver.Resolve(sc_list))
851 return *load_addr;
852 }
853
854 lldb::addr_t best_internal_load_address =
855 resolver.GetBestInternalLoadAddress();
856 if (best_internal_load_address != LLDB_INVALID_ADDRESS)
857 return best_internal_load_address;
858 }
859
860 return LLDB_INVALID_ADDRESS;
861}
862
863lldb::addr_t
864IRExecutionUnit::FindInRuntimes(const std::vector<ConstString> &names,
865 const lldb_private::SymbolContext &sc) {
866 lldb::TargetSP target_sp = sc.target_sp;
867
868 if (!target_sp) {
869 return LLDB_INVALID_ADDRESS;
870 }
871
872 lldb::ProcessSP process_sp = sc.target_sp->GetProcessSP();
873
874 if (!process_sp) {
875 return LLDB_INVALID_ADDRESS;
876 }
877
878 for (const ConstString &name : names) {
879 for (LanguageRuntime *runtime : process_sp->GetLanguageRuntimes()) {
880 lldb::addr_t symbol_load_addr = runtime->LookupRuntimeSymbol(name);
881
882 if (symbol_load_addr != LLDB_INVALID_ADDRESS)
883 return symbol_load_addr;
884 }
885 }
886
887 return LLDB_INVALID_ADDRESS;
888}
889
890lldb::addr_t IRExecutionUnit::FindInUserDefinedSymbols(
891 const std::vector<ConstString> &names,
892 const lldb_private::SymbolContext &sc) {
893 lldb::TargetSP target_sp = sc.target_sp;
894
895 for (const ConstString &name : names) {
896 lldb::addr_t symbol_load_addr = target_sp->GetPersistentSymbol(name);
897
898 if (symbol_load_addr != LLDB_INVALID_ADDRESS)
899 return symbol_load_addr;
900 }
901
902 return LLDB_INVALID_ADDRESS;
903}
904
905lldb::addr_t IRExecutionUnit::FindSymbol(lldb_private::ConstString name,
906 bool &missing_weak) {
907 std::vector<ConstString> candidate_C_names;
908 std::vector<ConstString> candidate_CPlusPlus_names;
909
910 CollectCandidateCNames(C_names&: candidate_C_names, name);
911
912 lldb::addr_t ret = FindInSymbols(names: candidate_C_names, sc: m_sym_ctx, symbol_was_missing_weak&: missing_weak);
913 if (ret != LLDB_INVALID_ADDRESS)
914 return ret;
915
916 // If we find the symbol in runtimes or user defined symbols it can't be
917 // a missing weak symbol.
918 missing_weak = false;
919 ret = FindInRuntimes(names: candidate_C_names, sc: m_sym_ctx);
920 if (ret != LLDB_INVALID_ADDRESS)
921 return ret;
922
923 ret = FindInUserDefinedSymbols(names: candidate_C_names, sc: m_sym_ctx);
924 if (ret != LLDB_INVALID_ADDRESS)
925 return ret;
926
927 CollectCandidateCPlusPlusNames(CPP_names&: candidate_CPlusPlus_names, C_names: candidate_C_names,
928 sc: m_sym_ctx);
929 ret = FindInSymbols(names: candidate_CPlusPlus_names, sc: m_sym_ctx, symbol_was_missing_weak&: missing_weak);
930 return ret;
931}
932
933void IRExecutionUnit::GetStaticInitializers(
934 std::vector<lldb::addr_t> &static_initializers) {
935 Log *log = GetLog(mask: LLDBLog::Expressions);
936
937 llvm::GlobalVariable *global_ctors =
938 m_module->getNamedGlobal(Name: "llvm.global_ctors");
939 if (!global_ctors) {
940 LLDB_LOG(log, "Couldn't find llvm.global_ctors.");
941 return;
942 }
943 auto *ctor_array =
944 llvm::dyn_cast<llvm::ConstantArray>(Val: global_ctors->getInitializer());
945 if (!ctor_array) {
946 LLDB_LOG(log, "llvm.global_ctors not a ConstantArray.");
947 return;
948 }
949
950 for (llvm::Use &ctor_use : ctor_array->operands()) {
951 auto *ctor_struct = llvm::dyn_cast<llvm::ConstantStruct>(Val&: ctor_use);
952 if (!ctor_struct)
953 continue;
954 // this is standardized
955 lldbassert(ctor_struct->getNumOperands() == 3);
956 auto *ctor_function =
957 llvm::dyn_cast<llvm::Function>(Val: ctor_struct->getOperand(i_nocapture: 1));
958 if (!ctor_function) {
959 LLDB_LOG(log, "global_ctor doesn't contain an llvm::Function");
960 continue;
961 }
962
963 ConstString ctor_function_name(ctor_function->getName().str());
964 LLDB_LOG(log, "Looking for callable jitted function with name {0}.",
965 ctor_function_name);
966
967 for (JittedFunction &jitted_function : m_jitted_functions) {
968 if (ctor_function_name != jitted_function.m_name)
969 continue;
970 if (jitted_function.m_remote_addr == LLDB_INVALID_ADDRESS) {
971 LLDB_LOG(log, "Found jitted function with invalid address.");
972 continue;
973 }
974 static_initializers.push_back(x: jitted_function.m_remote_addr);
975 LLDB_LOG(log, "Calling function at address {0:x}.",
976 jitted_function.m_remote_addr);
977 break;
978 }
979 }
980}
981
982llvm::JITSymbol
983IRExecutionUnit::MemoryManager::findSymbol(const std::string &Name) {
984 bool missing_weak = false;
985 uint64_t addr = GetSymbolAddressAndPresence(Name, missing_weak);
986 // This is a weak symbol:
987 if (missing_weak)
988 return llvm::JITSymbol(addr,
989 llvm::JITSymbolFlags::Exported | llvm::JITSymbolFlags::Weak);
990 else
991 return llvm::JITSymbol(addr, llvm::JITSymbolFlags::Exported);
992}
993
994uint64_t
995IRExecutionUnit::MemoryManager::getSymbolAddress(const std::string &Name) {
996 bool missing_weak = false;
997 return GetSymbolAddressAndPresence(Name, missing_weak);
998}
999
1000uint64_t
1001IRExecutionUnit::MemoryManager::GetSymbolAddressAndPresence(
1002 const std::string &Name, bool &missing_weak) {
1003 Log *log = GetLog(mask: LLDBLog::Expressions);
1004
1005 ConstString name_cs(Name.c_str());
1006
1007 lldb::addr_t ret = m_parent.FindSymbol(name: name_cs, missing_weak);
1008
1009 if (ret == LLDB_INVALID_ADDRESS) {
1010 LLDB_LOGF(log,
1011 "IRExecutionUnit::getSymbolAddress(Name=\"%s\") = <not found>",
1012 Name.c_str());
1013
1014 m_parent.ReportSymbolLookupError(name: name_cs);
1015 return 0;
1016 } else {
1017 LLDB_LOGF(log, "IRExecutionUnit::getSymbolAddress(Name=\"%s\") = %" PRIx64,
1018 Name.c_str(), ret);
1019 return ret;
1020 }
1021}
1022
1023void *IRExecutionUnit::MemoryManager::getPointerToNamedFunction(
1024 const std::string &Name, bool AbortOnFailure) {
1025 return (void *)getSymbolAddress(Name);
1026}
1027
1028lldb::addr_t
1029IRExecutionUnit::GetRemoteAddressForLocal(lldb::addr_t local_address) {
1030 Log *log = GetLog(mask: LLDBLog::Expressions);
1031
1032 for (AllocationRecord &record : m_records) {
1033 if (local_address >= record.m_host_address &&
1034 local_address < record.m_host_address + record.m_size) {
1035 if (record.m_process_address == LLDB_INVALID_ADDRESS)
1036 return LLDB_INVALID_ADDRESS;
1037
1038 lldb::addr_t ret =
1039 record.m_process_address + (local_address - record.m_host_address);
1040
1041 LLDB_LOGF(log,
1042 "IRExecutionUnit::GetRemoteAddressForLocal() found 0x%" PRIx64
1043 " in [0x%" PRIx64 "..0x%" PRIx64 "], and returned 0x%" PRIx64
1044 " from [0x%" PRIx64 "..0x%" PRIx64 "].",
1045 local_address, (uint64_t)record.m_host_address,
1046 (uint64_t)record.m_host_address + (uint64_t)record.m_size, ret,
1047 record.m_process_address,
1048 record.m_process_address + record.m_size);
1049
1050 return ret;
1051 }
1052 }
1053
1054 return LLDB_INVALID_ADDRESS;
1055}
1056
1057IRExecutionUnit::AddrRange
1058IRExecutionUnit::GetRemoteRangeForLocal(lldb::addr_t local_address) {
1059 for (AllocationRecord &record : m_records) {
1060 if (local_address >= record.m_host_address &&
1061 local_address < record.m_host_address + record.m_size) {
1062 if (record.m_process_address == LLDB_INVALID_ADDRESS)
1063 return AddrRange(0, 0);
1064
1065 return AddrRange(record.m_process_address, record.m_size);
1066 }
1067 }
1068
1069 return AddrRange(0, 0);
1070}
1071
1072bool IRExecutionUnit::CommitOneAllocation(lldb::ProcessSP &process_sp,
1073 Status &error,
1074 AllocationRecord &record) {
1075 if (record.m_process_address != LLDB_INVALID_ADDRESS) {
1076 return true;
1077 }
1078
1079 switch (record.m_sect_type) {
1080 case lldb::eSectionTypeInvalid:
1081 case lldb::eSectionTypeDWARFDebugAbbrev:
1082 case lldb::eSectionTypeDWARFDebugAddr:
1083 case lldb::eSectionTypeDWARFDebugAranges:
1084 case lldb::eSectionTypeDWARFDebugCuIndex:
1085 case lldb::eSectionTypeDWARFDebugFrame:
1086 case lldb::eSectionTypeDWARFDebugInfo:
1087 case lldb::eSectionTypeDWARFDebugLine:
1088 case lldb::eSectionTypeDWARFDebugLoc:
1089 case lldb::eSectionTypeDWARFDebugLocLists:
1090 case lldb::eSectionTypeDWARFDebugMacInfo:
1091 case lldb::eSectionTypeDWARFDebugPubNames:
1092 case lldb::eSectionTypeDWARFDebugPubTypes:
1093 case lldb::eSectionTypeDWARFDebugRanges:
1094 case lldb::eSectionTypeDWARFDebugStr:
1095 case lldb::eSectionTypeDWARFDebugStrOffsets:
1096 case lldb::eSectionTypeDWARFAppleNames:
1097 case lldb::eSectionTypeDWARFAppleTypes:
1098 case lldb::eSectionTypeDWARFAppleNamespaces:
1099 case lldb::eSectionTypeDWARFAppleObjC:
1100 case lldb::eSectionTypeDWARFGNUDebugAltLink:
1101 error.Clear();
1102 break;
1103 default:
1104 const bool zero_memory = false;
1105 record.m_process_address =
1106 Malloc(size: record.m_size, alignment: record.m_alignment, permissions: record.m_permissions,
1107 policy: eAllocationPolicyProcessOnly, zero_memory, error);
1108 break;
1109 }
1110
1111 return error.Success();
1112}
1113
1114bool IRExecutionUnit::CommitAllocations(lldb::ProcessSP &process_sp) {
1115 bool ret = true;
1116
1117 lldb_private::Status err;
1118
1119 for (AllocationRecord &record : m_records) {
1120 ret = CommitOneAllocation(process_sp, error&: err, record);
1121
1122 if (!ret) {
1123 break;
1124 }
1125 }
1126
1127 if (!ret) {
1128 for (AllocationRecord &record : m_records) {
1129 if (record.m_process_address != LLDB_INVALID_ADDRESS) {
1130 Free(process_address: record.m_process_address, error&: err);
1131 record.m_process_address = LLDB_INVALID_ADDRESS;
1132 }
1133 }
1134 }
1135
1136 return ret;
1137}
1138
1139void IRExecutionUnit::ReportAllocations(llvm::ExecutionEngine &engine) {
1140 m_reported_allocations = true;
1141
1142 for (AllocationRecord &record : m_records) {
1143 if (record.m_process_address == LLDB_INVALID_ADDRESS)
1144 continue;
1145
1146 if (record.m_section_id == eSectionIDInvalid)
1147 continue;
1148
1149 engine.mapSectionAddress(LocalAddress: (void *)record.m_host_address,
1150 TargetAddress: record.m_process_address);
1151 }
1152
1153 // Trigger re-application of relocations.
1154 engine.finalizeObject();
1155}
1156
1157bool IRExecutionUnit::WriteData(lldb::ProcessSP &process_sp) {
1158 bool wrote_something = false;
1159 for (AllocationRecord &record : m_records) {
1160 if (record.m_process_address != LLDB_INVALID_ADDRESS) {
1161 lldb_private::Status err;
1162 WriteMemory(process_address: record.m_process_address, bytes: (uint8_t *)record.m_host_address,
1163 size: record.m_size, error&: err);
1164 if (err.Success())
1165 wrote_something = true;
1166 }
1167 }
1168 return wrote_something;
1169}
1170
1171void IRExecutionUnit::AllocationRecord::dump(Log *log) {
1172 if (!log)
1173 return;
1174
1175 LLDB_LOGF(log,
1176 "[0x%llx+0x%llx]->0x%llx (alignment %d, section ID %d, name %s)",
1177 (unsigned long long)m_host_address, (unsigned long long)m_size,
1178 (unsigned long long)m_process_address, (unsigned)m_alignment,
1179 (unsigned)m_section_id, m_name.c_str());
1180}
1181
1182lldb::ByteOrder IRExecutionUnit::GetByteOrder() const {
1183 ExecutionContext exe_ctx(GetBestExecutionContextScope());
1184 return exe_ctx.GetByteOrder();
1185}
1186
1187uint32_t IRExecutionUnit::GetAddressByteSize() const {
1188 ExecutionContext exe_ctx(GetBestExecutionContextScope());
1189 return exe_ctx.GetAddressByteSize();
1190}
1191
1192void IRExecutionUnit::PopulateSymtab(lldb_private::ObjectFile *obj_file,
1193 lldb_private::Symtab &symtab) {
1194 // No symbols yet...
1195}
1196
1197void IRExecutionUnit::PopulateSectionList(
1198 lldb_private::ObjectFile *obj_file,
1199 lldb_private::SectionList &section_list) {
1200 for (AllocationRecord &record : m_records) {
1201 if (record.m_size > 0) {
1202 lldb::SectionSP section_sp(new lldb_private::Section(
1203 obj_file->GetModule(), obj_file, record.m_section_id,
1204 ConstString(record.m_name), record.m_sect_type,
1205 record.m_process_address, record.m_size,
1206 record.m_host_address, // file_offset (which is the host address for
1207 // the data)
1208 record.m_size, // file_size
1209 0,
1210 record.m_permissions)); // flags
1211 section_list.AddSection(section_sp);
1212 }
1213 }
1214}
1215
1216ArchSpec IRExecutionUnit::GetArchitecture() {
1217 ExecutionContext exe_ctx(GetBestExecutionContextScope());
1218 if(Target *target = exe_ctx.GetTargetPtr())
1219 return target->GetArchitecture();
1220 return ArchSpec();
1221}
1222
1223lldb::ModuleSP IRExecutionUnit::GetJITModule() {
1224 ExecutionContext exe_ctx(GetBestExecutionContextScope());
1225 Target *target = exe_ctx.GetTargetPtr();
1226 if (!target)
1227 return nullptr;
1228
1229 auto Delegate = std::static_pointer_cast<lldb_private::ObjectFileJITDelegate>(
1230 r: shared_from_this());
1231
1232 lldb::ModuleSP jit_module_sp =
1233 lldb_private::Module::CreateModuleFromObjectFile<ObjectFileJIT>(args&: Delegate);
1234 if (!jit_module_sp)
1235 return nullptr;
1236
1237 bool changed = false;
1238 jit_module_sp->SetLoadAddress(target&: *target, value: 0, value_is_offset: true, changed);
1239 return jit_module_sp;
1240}
1241

source code of lldb/source/Expression/IRExecutionUnit.cpp