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IRMemoryMap.cpp
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1 //===-- IRMemoryMap.cpp -----------------------------------------*- C++ -*-===//
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 
11 #include "lldb/Target/Process.h"
12 #include "lldb/Target/Target.h"
16 #include "lldb/Utility/Log.h"
17 #include "lldb/Utility/Scalar.h"
18 #include "lldb/Utility/Status.h"
19 
20 using namespace lldb_private;
21 
22 IRMemoryMap::IRMemoryMap(lldb::TargetSP target_sp) : m_target_wp(target_sp) {
23  if (target_sp)
24  m_process_wp = target_sp->GetProcessSP();
25 }
26 
28  lldb::ProcessSP process_sp = m_process_wp.lock();
29 
30  if (process_sp) {
31  AllocationMap::iterator iter;
32 
33  Status err;
34 
35  while ((iter = m_allocations.begin()) != m_allocations.end()) {
36  err.Clear();
37  if (iter->second.m_leak)
38  m_allocations.erase(iter);
39  else
40  Free(iter->first, err);
41  }
42  }
43 }
44 
45 lldb::addr_t IRMemoryMap::FindSpace(size_t size) {
46  // The FindSpace algorithm's job is to find a region of memory that the
47  // underlying process is unlikely to be using.
48  //
49  // The memory returned by this function will never be written to. The only
50  // point is that it should not shadow process memory if possible, so that
51  // expressions processing real values from the process do not use the wrong
52  // data.
53  //
54  // If the process can in fact allocate memory (CanJIT() lets us know this)
55  // then this can be accomplished just be allocating memory in the inferior.
56  // Then no guessing is required.
57 
58  lldb::TargetSP target_sp = m_target_wp.lock();
59  lldb::ProcessSP process_sp = m_process_wp.lock();
60 
61  const bool process_is_alive = process_sp && process_sp->IsAlive();
62 
64  if (size == 0)
65  return ret;
66 
67  if (process_is_alive && process_sp->CanJIT()) {
68  Status alloc_error;
69 
70  ret = process_sp->AllocateMemory(size, lldb::ePermissionsReadable |
71  lldb::ePermissionsWritable,
72  alloc_error);
73 
74  if (!alloc_error.Success())
75  return LLDB_INVALID_ADDRESS;
76  else
77  return ret;
78  }
79 
80  // At this point we know that we need to hunt.
81  //
82  // First, go to the end of the existing allocations we've made if there are
83  // any allocations. Otherwise start at the beginning of memory.
84 
85  if (m_allocations.empty()) {
86  ret = 0x0;
87  } else {
88  auto back = m_allocations.rbegin();
89  lldb::addr_t addr = back->first;
90  size_t alloc_size = back->second.m_size;
91  ret = llvm::alignTo(addr + alloc_size, 4096);
92  }
93 
94  // Now, if it's possible to use the GetMemoryRegionInfo API to detect mapped
95  // regions, walk forward through memory until a region is found that has
96  // adequate space for our allocation.
97  if (process_is_alive) {
98  const uint64_t end_of_memory = process_sp->GetAddressByteSize() == 8
99  ? 0xffffffffffffffffull
100  : 0xffffffffull;
101 
102  lldbassert(process_sp->GetAddressByteSize() == 4 ||
103  end_of_memory != 0xffffffffull);
104 
105  MemoryRegionInfo region_info;
106  Status err = process_sp->GetMemoryRegionInfo(ret, region_info);
107  if (err.Success()) {
108  while (true) {
109  if (region_info.GetReadable() != MemoryRegionInfo::OptionalBool::eNo ||
110  region_info.GetWritable() != MemoryRegionInfo::OptionalBool::eNo ||
111  region_info.GetExecutable() !=
112  MemoryRegionInfo::OptionalBool::eNo) {
113  if (region_info.GetRange().GetRangeEnd() - 1 >= end_of_memory) {
114  ret = LLDB_INVALID_ADDRESS;
115  break;
116  } else {
117  ret = region_info.GetRange().GetRangeEnd();
118  }
119  } else if (ret + size < region_info.GetRange().GetRangeEnd()) {
120  return ret;
121  } else {
122  // ret stays the same. We just need to walk a bit further.
123  }
124 
125  err = process_sp->GetMemoryRegionInfo(
126  region_info.GetRange().GetRangeEnd(), region_info);
127  if (err.Fail()) {
128  lldbassert(0 && "GetMemoryRegionInfo() succeeded, then failed");
129  ret = LLDB_INVALID_ADDRESS;
130  break;
131  }
132  }
133  }
134  }
135 
136  // We've tried our algorithm, and it didn't work. Now we have to reset back
137  // to the end of the allocations we've already reported, or use a 'sensible'
138  // default if this is our first allocation.
139 
140  if (m_allocations.empty()) {
141  uint32_t address_byte_size = GetAddressByteSize();
142  if (address_byte_size != UINT32_MAX) {
143  switch (address_byte_size) {
144  case 8:
145  ret = 0xffffffff00000000ull;
146  break;
147  case 4:
148  ret = 0xee000000ull;
149  break;
150  default:
151  break;
152  }
153  }
154  } else {
155  auto back = m_allocations.rbegin();
156  lldb::addr_t addr = back->first;
157  size_t alloc_size = back->second.m_size;
158  ret = llvm::alignTo(addr + alloc_size, 4096);
159  }
160 
161  return ret;
162 }
163 
164 IRMemoryMap::AllocationMap::iterator
165 IRMemoryMap::FindAllocation(lldb::addr_t addr, size_t size) {
166  if (addr == LLDB_INVALID_ADDRESS)
167  return m_allocations.end();
168 
169  AllocationMap::iterator iter = m_allocations.lower_bound(addr);
170 
171  if (iter == m_allocations.end() || iter->first > addr) {
172  if (iter == m_allocations.begin())
173  return m_allocations.end();
174  iter--;
175  }
176 
177  if (iter->first <= addr && iter->first + iter->second.m_size >= addr + size)
178  return iter;
179 
180  return m_allocations.end();
181 }
182 
183 bool IRMemoryMap::IntersectsAllocation(lldb::addr_t addr, size_t size) const {
184  if (addr == LLDB_INVALID_ADDRESS)
185  return false;
186 
187  AllocationMap::const_iterator iter = m_allocations.lower_bound(addr);
188 
189  // Since we only know that the returned interval begins at a location greater
190  // than or equal to where the given interval begins, it's possible that the
191  // given interval intersects either the returned interval or the previous
192  // interval. Thus, we need to check both. Note that we only need to check
193  // these two intervals. Since all intervals are disjoint it is not possible
194  // that an adjacent interval does not intersect, but a non-adjacent interval
195  // does intersect.
196  if (iter != m_allocations.end()) {
197  if (AllocationsIntersect(addr, size, iter->second.m_process_start,
198  iter->second.m_size))
199  return true;
200  }
201 
202  if (iter != m_allocations.begin()) {
203  --iter;
204  if (AllocationsIntersect(addr, size, iter->second.m_process_start,
205  iter->second.m_size))
206  return true;
207  }
208 
209  return false;
210 }
211 
212 bool IRMemoryMap::AllocationsIntersect(lldb::addr_t addr1, size_t size1,
213  lldb::addr_t addr2, size_t size2) {
214  // Given two half open intervals [A, B) and [X, Y), the only 6 permutations
215  // that satisfy A<B and X<Y are the following:
216  // A B X Y
217  // A X B Y (intersects)
218  // A X Y B (intersects)
219  // X A B Y (intersects)
220  // X A Y B (intersects)
221  // X Y A B
222  // The first is B <= X, and the last is Y <= A. So the condition is !(B <= X
223  // || Y <= A)), or (X < B && A < Y)
224  return (addr2 < (addr1 + size1)) && (addr1 < (addr2 + size2));
225 }
226 
228  lldb::ProcessSP process_sp = m_process_wp.lock();
229 
230  if (process_sp)
231  return process_sp->GetByteOrder();
232 
233  lldb::TargetSP target_sp = m_target_wp.lock();
234 
235  if (target_sp)
236  return target_sp->GetArchitecture().GetByteOrder();
237 
239 }
240 
242  lldb::ProcessSP process_sp = m_process_wp.lock();
243 
244  if (process_sp)
245  return process_sp->GetAddressByteSize();
246 
247  lldb::TargetSP target_sp = m_target_wp.lock();
248 
249  if (target_sp)
250  return target_sp->GetArchitecture().GetAddressByteSize();
251 
252  return UINT32_MAX;
253 }
254 
256  lldb::ProcessSP process_sp = m_process_wp.lock();
257 
258  if (process_sp)
259  return process_sp.get();
260 
261  lldb::TargetSP target_sp = m_target_wp.lock();
262 
263  if (target_sp)
264  return target_sp.get();
265 
266  return NULL;
267 }
268 
269 IRMemoryMap::Allocation::Allocation(lldb::addr_t process_alloc,
270  lldb::addr_t process_start, size_t size,
271  uint32_t permissions, uint8_t alignment,
272  AllocationPolicy policy)
273  : m_process_alloc(process_alloc), m_process_start(process_start),
274  m_size(size), m_policy(policy), m_leak(false), m_permissions(permissions),
275  m_alignment(alignment) {
276  switch (policy) {
277  default:
278  llvm_unreachable("Invalid AllocationPolicy");
281  m_data.SetByteSize(size);
282  break;
284  break;
285  }
286 }
287 
288 lldb::addr_t IRMemoryMap::Malloc(size_t size, uint8_t alignment,
289  uint32_t permissions, AllocationPolicy policy,
290  bool zero_memory, Status &error) {
291  lldb_private::Log *log(
293  error.Clear();
294 
295  lldb::ProcessSP process_sp;
296  lldb::addr_t allocation_address = LLDB_INVALID_ADDRESS;
297  lldb::addr_t aligned_address = LLDB_INVALID_ADDRESS;
298 
299  size_t allocation_size;
300 
301  if (size == 0) {
302  // FIXME: Malloc(0) should either return an invalid address or assert, in
303  // order to cut down on unnecessary allocations.
304  allocation_size = alignment;
305  } else {
306  // Round up the requested size to an aligned value.
307  allocation_size = llvm::alignTo(size, alignment);
308 
309  // The process page cache does not see the requested alignment. We can't
310  // assume its result will be any more than 1-byte aligned. To work around
311  // this, request `alignment - 1` additional bytes.
312  allocation_size += alignment - 1;
313  }
314 
315  switch (policy) {
316  default:
317  error.SetErrorToGenericError();
318  error.SetErrorString("Couldn't malloc: invalid allocation policy");
319  return LLDB_INVALID_ADDRESS;
321  allocation_address = FindSpace(allocation_size);
322  if (allocation_address == LLDB_INVALID_ADDRESS) {
323  error.SetErrorToGenericError();
324  error.SetErrorString("Couldn't malloc: address space is full");
325  return LLDB_INVALID_ADDRESS;
326  }
327  break;
329  process_sp = m_process_wp.lock();
330  if (log)
331  log->Printf("IRMemoryMap::%s process_sp=0x%" PRIx64
332  ", process_sp->CanJIT()=%s, process_sp->IsAlive()=%s",
333  __FUNCTION__, (lldb::addr_t)process_sp.get(),
334  process_sp && process_sp->CanJIT() ? "true" : "false",
335  process_sp && process_sp->IsAlive() ? "true" : "false");
336  if (process_sp && process_sp->CanJIT() && process_sp->IsAlive()) {
337  if (!zero_memory)
338  allocation_address =
339  process_sp->AllocateMemory(allocation_size, permissions, error);
340  else
341  allocation_address =
342  process_sp->CallocateMemory(allocation_size, permissions, error);
343 
344  if (!error.Success())
345  return LLDB_INVALID_ADDRESS;
346  } else {
347  if (log)
348  log->Printf("IRMemoryMap::%s switching to eAllocationPolicyHostOnly "
349  "due to failed condition (see previous expr log message)",
350  __FUNCTION__);
351  policy = eAllocationPolicyHostOnly;
352  allocation_address = FindSpace(allocation_size);
353  if (allocation_address == LLDB_INVALID_ADDRESS) {
354  error.SetErrorToGenericError();
355  error.SetErrorString("Couldn't malloc: address space is full");
356  return LLDB_INVALID_ADDRESS;
357  }
358  }
359  break;
361  process_sp = m_process_wp.lock();
362  if (process_sp) {
363  if (process_sp->CanJIT() && process_sp->IsAlive()) {
364  if (!zero_memory)
365  allocation_address =
366  process_sp->AllocateMemory(allocation_size, permissions, error);
367  else
368  allocation_address =
369  process_sp->CallocateMemory(allocation_size, permissions, error);
370 
371  if (!error.Success())
372  return LLDB_INVALID_ADDRESS;
373  } else {
374  error.SetErrorToGenericError();
375  error.SetErrorString(
376  "Couldn't malloc: process doesn't support allocating memory");
377  return LLDB_INVALID_ADDRESS;
378  }
379  } else {
380  error.SetErrorToGenericError();
381  error.SetErrorString("Couldn't malloc: process doesn't exist, and this "
382  "memory must be in the process");
383  return LLDB_INVALID_ADDRESS;
384  }
385  break;
386  }
387 
388  lldb::addr_t mask = alignment - 1;
389  aligned_address = (allocation_address + mask) & (~mask);
390 
391  m_allocations.emplace(
392  std::piecewise_construct, std::forward_as_tuple(aligned_address),
393  std::forward_as_tuple(allocation_address, aligned_address,
394  allocation_size, permissions, alignment, policy));
395 
396  if (zero_memory) {
397  Status write_error;
398  std::vector<uint8_t> zero_buf(size, 0);
399  WriteMemory(aligned_address, zero_buf.data(), size, write_error);
400  }
401 
402  if (log) {
403  const char *policy_string;
404 
405  switch (policy) {
406  default:
407  policy_string = "<invalid policy>";
408  break;
410  policy_string = "eAllocationPolicyHostOnly";
411  break;
413  policy_string = "eAllocationPolicyProcessOnly";
414  break;
416  policy_string = "eAllocationPolicyMirror";
417  break;
418  }
419 
420  log->Printf("IRMemoryMap::Malloc (%" PRIu64 ", 0x%" PRIx64 ", 0x%" PRIx64
421  ", %s) -> 0x%" PRIx64,
422  (uint64_t)allocation_size, (uint64_t)alignment,
423  (uint64_t)permissions, policy_string, aligned_address);
424  }
425 
426  return aligned_address;
427 }
428 
429 void IRMemoryMap::Leak(lldb::addr_t process_address, Status &error) {
430  error.Clear();
431 
432  AllocationMap::iterator iter = m_allocations.find(process_address);
433 
434  if (iter == m_allocations.end()) {
435  error.SetErrorToGenericError();
436  error.SetErrorString("Couldn't leak: allocation doesn't exist");
437  return;
438  }
439 
440  Allocation &allocation = iter->second;
441 
442  allocation.m_leak = true;
443 }
444 
445 void IRMemoryMap::Free(lldb::addr_t process_address, Status &error) {
446  error.Clear();
447 
448  AllocationMap::iterator iter = m_allocations.find(process_address);
449 
450  if (iter == m_allocations.end()) {
451  error.SetErrorToGenericError();
452  error.SetErrorString("Couldn't free: allocation doesn't exist");
453  return;
454  }
455 
456  Allocation &allocation = iter->second;
457 
458  switch (allocation.m_policy) {
459  default:
461  lldb::ProcessSP process_sp = m_process_wp.lock();
462  if (process_sp) {
463  if (process_sp->CanJIT() && process_sp->IsAlive())
464  process_sp->DeallocateMemory(
465  allocation.m_process_alloc); // FindSpace allocated this for real
466  }
467 
468  break;
469  }
472  lldb::ProcessSP process_sp = m_process_wp.lock();
473  if (process_sp)
474  process_sp->DeallocateMemory(allocation.m_process_alloc);
475  }
476  }
477 
478  if (lldb_private::Log *log =
480  log->Printf("IRMemoryMap::Free (0x%" PRIx64 ") freed [0x%" PRIx64
481  "..0x%" PRIx64 ")",
482  (uint64_t)process_address, iter->second.m_process_start,
483  iter->second.m_process_start + iter->second.m_size);
484  }
485 
486  m_allocations.erase(iter);
487 }
488 
489 bool IRMemoryMap::GetAllocSize(lldb::addr_t address, size_t &size) {
490  AllocationMap::iterator iter = FindAllocation(address, size);
491  if (iter == m_allocations.end())
492  return false;
493 
494  Allocation &al = iter->second;
495 
496  if (address > (al.m_process_start + al.m_size)) {
497  size = 0;
498  return false;
499  }
500 
501  if (address > al.m_process_start) {
502  int dif = address - al.m_process_start;
503  size = al.m_size - dif;
504  return true;
505  }
506 
507  size = al.m_size;
508  return true;
509 }
510 
512  const uint8_t *bytes, size_t size,
513  Status &error) {
514  error.Clear();
515 
516  AllocationMap::iterator iter = FindAllocation(process_address, size);
517 
518  if (iter == m_allocations.end()) {
519  lldb::ProcessSP process_sp = m_process_wp.lock();
520 
521  if (process_sp) {
522  process_sp->WriteMemory(process_address, bytes, size, error);
523  return;
524  }
525 
526  error.SetErrorToGenericError();
527  error.SetErrorString("Couldn't write: no allocation contains the target "
528  "range and the process doesn't exist");
529  return;
530  }
531 
532  Allocation &allocation = iter->second;
533 
534  uint64_t offset = process_address - allocation.m_process_start;
535 
536  lldb::ProcessSP process_sp;
537 
538  switch (allocation.m_policy) {
539  default:
540  error.SetErrorToGenericError();
541  error.SetErrorString("Couldn't write: invalid allocation policy");
542  return;
544  if (!allocation.m_data.GetByteSize()) {
545  error.SetErrorToGenericError();
546  error.SetErrorString("Couldn't write: data buffer is empty");
547  return;
548  }
549  ::memcpy(allocation.m_data.GetBytes() + offset, bytes, size);
550  break;
552  if (!allocation.m_data.GetByteSize()) {
553  error.SetErrorToGenericError();
554  error.SetErrorString("Couldn't write: data buffer is empty");
555  return;
556  }
557  ::memcpy(allocation.m_data.GetBytes() + offset, bytes, size);
558  process_sp = m_process_wp.lock();
559  if (process_sp) {
560  process_sp->WriteMemory(process_address, bytes, size, error);
561  if (!error.Success())
562  return;
563  }
564  break;
566  process_sp = m_process_wp.lock();
567  if (process_sp) {
568  process_sp->WriteMemory(process_address, bytes, size, error);
569  if (!error.Success())
570  return;
571  }
572  break;
573  }
574 
575  if (lldb_private::Log *log =
577  log->Printf("IRMemoryMap::WriteMemory (0x%" PRIx64 ", 0x%" PRIx64
578  ", 0x%" PRId64 ") went to [0x%" PRIx64 "..0x%" PRIx64 ")",
579  (uint64_t)process_address, (uint64_t)bytes, (uint64_t)size,
580  (uint64_t)allocation.m_process_start,
581  (uint64_t)allocation.m_process_start +
582  (uint64_t)allocation.m_size);
583  }
584 }
585 
587  Scalar &scalar, size_t size,
588  Status &error) {
589  error.Clear();
590 
591  if (size == UINT32_MAX)
592  size = scalar.GetByteSize();
593 
594  if (size > 0) {
595  uint8_t buf[32];
596  const size_t mem_size =
597  scalar.GetAsMemoryData(buf, size, GetByteOrder(), error);
598  if (mem_size > 0) {
599  return WriteMemory(process_address, buf, mem_size, error);
600  } else {
601  error.SetErrorToGenericError();
602  error.SetErrorString(
603  "Couldn't write scalar: failed to get scalar as memory data");
604  }
605  } else {
606  error.SetErrorToGenericError();
607  error.SetErrorString("Couldn't write scalar: its size was zero");
608  }
609  return;
610 }
611 
613  lldb::addr_t address, Status &error) {
614  error.Clear();
615 
616  Scalar scalar(address);
617 
618  WriteScalarToMemory(process_address, scalar, GetAddressByteSize(), error);
619 }
620 
621 void IRMemoryMap::ReadMemory(uint8_t *bytes, lldb::addr_t process_address,
622  size_t size, Status &error) {
623  error.Clear();
624 
625  AllocationMap::iterator iter = FindAllocation(process_address, size);
626 
627  if (iter == m_allocations.end()) {
628  lldb::ProcessSP process_sp = m_process_wp.lock();
629 
630  if (process_sp) {
631  process_sp->ReadMemory(process_address, bytes, size, error);
632  return;
633  }
634 
635  lldb::TargetSP target_sp = m_target_wp.lock();
636 
637  if (target_sp) {
638  Address absolute_address(process_address);
639  target_sp->ReadMemory(absolute_address, false, bytes, size, error);
640  return;
641  }
642 
643  error.SetErrorToGenericError();
644  error.SetErrorString("Couldn't read: no allocation contains the target "
645  "range, and neither the process nor the target exist");
646  return;
647  }
648 
649  Allocation &allocation = iter->second;
650 
651  uint64_t offset = process_address - allocation.m_process_start;
652 
653  if (offset > allocation.m_size) {
654  error.SetErrorToGenericError();
655  error.SetErrorString("Couldn't read: data is not in the allocation");
656  return;
657  }
658 
659  lldb::ProcessSP process_sp;
660 
661  switch (allocation.m_policy) {
662  default:
663  error.SetErrorToGenericError();
664  error.SetErrorString("Couldn't read: invalid allocation policy");
665  return;
667  if (!allocation.m_data.GetByteSize()) {
668  error.SetErrorToGenericError();
669  error.SetErrorString("Couldn't read: data buffer is empty");
670  return;
671  }
672  if (allocation.m_data.GetByteSize() < offset + size) {
673  error.SetErrorToGenericError();
674  error.SetErrorString("Couldn't read: not enough underlying data");
675  return;
676  }
677 
678  ::memcpy(bytes, allocation.m_data.GetBytes() + offset, size);
679  break;
681  process_sp = m_process_wp.lock();
682  if (process_sp) {
683  process_sp->ReadMemory(process_address, bytes, size, error);
684  if (!error.Success())
685  return;
686  } else {
687  if (!allocation.m_data.GetByteSize()) {
688  error.SetErrorToGenericError();
689  error.SetErrorString("Couldn't read: data buffer is empty");
690  return;
691  }
692  ::memcpy(bytes, allocation.m_data.GetBytes() + offset, size);
693  }
694  break;
696  process_sp = m_process_wp.lock();
697  if (process_sp) {
698  process_sp->ReadMemory(process_address, bytes, size, error);
699  if (!error.Success())
700  return;
701  }
702  break;
703  }
704 
705  if (lldb_private::Log *log =
707  log->Printf("IRMemoryMap::ReadMemory (0x%" PRIx64 ", 0x%" PRIx64
708  ", 0x%" PRId64 ") came from [0x%" PRIx64 "..0x%" PRIx64 ")",
709  (uint64_t)process_address, (uint64_t)bytes, (uint64_t)size,
710  (uint64_t)allocation.m_process_start,
711  (uint64_t)allocation.m_process_start +
712  (uint64_t)allocation.m_size);
713  }
714 }
715 
717  lldb::addr_t process_address,
718  size_t size, Status &error) {
719  error.Clear();
720 
721  if (size > 0) {
722  DataBufferHeap buf(size, 0);
723  ReadMemory(buf.GetBytes(), process_address, size, error);
724 
725  if (!error.Success())
726  return;
727 
728  DataExtractor extractor(buf.GetBytes(), buf.GetByteSize(), GetByteOrder(),
730 
731  lldb::offset_t offset = 0;
732 
733  switch (size) {
734  default:
735  error.SetErrorToGenericError();
737  "Couldn't read scalar: unsupported size %" PRIu64, (uint64_t)size);
738  return;
739  case 1:
740  scalar = extractor.GetU8(&offset);
741  break;
742  case 2:
743  scalar = extractor.GetU16(&offset);
744  break;
745  case 4:
746  scalar = extractor.GetU32(&offset);
747  break;
748  case 8:
749  scalar = extractor.GetU64(&offset);
750  break;
751  }
752  } else {
753  error.SetErrorToGenericError();
754  error.SetErrorString("Couldn't read scalar: its size was zero");
755  }
756  return;
757 }
758 
760  lldb::addr_t process_address,
761  Status &error) {
762  error.Clear();
763 
764  Scalar pointer_scalar;
765  ReadScalarFromMemory(pointer_scalar, process_address, GetAddressByteSize(),
766  error);
767 
768  if (!error.Success())
769  return;
770 
771  *address = pointer_scalar.ULongLong();
772 
773  return;
774 }
775 
777  lldb::addr_t process_address, size_t size,
778  Status &error) {
779  error.Clear();
780 
781  if (size > 0) {
782  AllocationMap::iterator iter = FindAllocation(process_address, size);
783 
784  if (iter == m_allocations.end()) {
785  error.SetErrorToGenericError();
787  "Couldn't find an allocation containing [0x%" PRIx64 "..0x%" PRIx64
788  ")",
789  process_address, process_address + size);
790  return;
791  }
792 
793  Allocation &allocation = iter->second;
794 
795  switch (allocation.m_policy) {
796  default:
797  error.SetErrorToGenericError();
798  error.SetErrorString(
799  "Couldn't get memory data: invalid allocation policy");
800  return;
802  error.SetErrorToGenericError();
803  error.SetErrorString(
804  "Couldn't get memory data: memory is only in the target");
805  return;
807  lldb::ProcessSP process_sp = m_process_wp.lock();
808 
809  if (!allocation.m_data.GetByteSize()) {
810  error.SetErrorToGenericError();
811  error.SetErrorString("Couldn't get memory data: data buffer is empty");
812  return;
813  }
814  if (process_sp) {
815  process_sp->ReadMemory(allocation.m_process_start,
816  allocation.m_data.GetBytes(),
817  allocation.m_data.GetByteSize(), error);
818  if (!error.Success())
819  return;
820  uint64_t offset = process_address - allocation.m_process_start;
821  extractor = DataExtractor(allocation.m_data.GetBytes() + offset, size,
823  return;
824  }
825  } break;
827  if (!allocation.m_data.GetByteSize()) {
828  error.SetErrorToGenericError();
829  error.SetErrorString("Couldn't get memory data: data buffer is empty");
830  return;
831  }
832  uint64_t offset = process_address - allocation.m_process_start;
833  extractor = DataExtractor(allocation.m_data.GetBytes() + offset, size,
835  return;
836  }
837  } else {
838  error.SetErrorToGenericError();
839  error.SetErrorString("Couldn't get memory data: its size was zero");
840  return;
841  }
842 }
void Free(lldb::addr_t process_address, Status &error)
An data extractor class.
Definition: DataExtractor.h:47
Enumerations for broadcasting.
Definition: SBLaunchInfo.h:14
size_t GetByteSize() const
Definition: Scalar.cpp:187
#define lldbassert(x)
Definition: LLDBAssert.h:15
IRMemoryMap(lldb::TargetSP target_sp)
Definition: IRMemoryMap.cpp:22
void WritePointerToMemory(lldb::addr_t process_address, lldb::addr_t address, Status &error)
size_t GetAsMemoryData(void *dst, size_t dst_len, lldb::ByteOrder dst_byte_order, Status &error) const
Definition: Scalar.cpp:2650
ExecutionContextScope * GetBestExecutionContextScope() const
void GetMemoryData(DataExtractor &extractor, lldb::addr_t process_address, size_t size, Status &error)
void WriteMemory(lldb::addr_t process_address, const uint8_t *bytes, size_t size, Status &error)
bool GetAllocSize(lldb::addr_t address, size_t &size)
A subclass of DataBuffer that stores a data buffer on the heap.
void ReadPointerFromMemory(lldb::addr_t *address, lldb::addr_t process_address, Status &error)
The intent is that this allocation exist only in the process.
Definition: IRMemoryMap.h:49
This allocation was created in the host and will never make it into the process.
Definition: IRMemoryMap.h:42
#define UINT32_MAX
Definition: lldb-defines.h:31
#define LLDB_INVALID_ADDRESS
Invalid value definitions.
Definition: lldb-defines.h:85
void ReadScalarFromMemory(Scalar &scalar, lldb::addr_t process_address, size_t size, Status &error)
void SetErrorToGenericError()
Set the current error to a generic error.
Definition: Status.cpp:231
uint64_t offset_t
Definition: lldb-types.h:87
Log * GetLogIfAllCategoriesSet(uint32_t mask)
Definition: Logging.cpp:57
void Leak(lldb::addr_t process_address, Status &error)
The intent is that this allocation exist both in the host and the process and have the same content i...
Definition: IRMemoryMap.h:46
void Clear()
Clear the object state.
Definition: Status.cpp:167
unsigned long long ULongLong(unsigned long long fail_value=0) const
Definition: Scalar.cpp:1566
void SetErrorString(llvm::StringRef err_str)
Set the current error string to err_str.
Definition: Status.cpp:241
"lldb/Target/ExecutionContextScope.h" Inherit from this if your object can reconstruct its execution ...
bool Success() const
Test for success condition.
Definition: Status.cpp:287
A section + offset based address class.
Definition: Address.h:80
void WriteScalarToMemory(lldb::addr_t process_address, Scalar &scalar, size_t size, Status &error)
uint64_t addr_t
Definition: lldb-types.h:83
bool Fail() const
Test for error condition.
Definition: Status.cpp:181
uint8_t * GetBytes() override
lldb::addr_t Malloc(size_t size, uint8_t alignment, uint32_t permissions, AllocationPolicy policy, bool zero_memory, Status &error)
int SetErrorStringWithFormat(const char *format,...) __attribute__((format(printf
Set the current error string to a formatted error string.
Definition: Status.cpp:255
#define LIBLLDB_LOG_EXPRESSIONS
Definition: Logging.h:22
lldb::ByteOrder GetByteOrder()
lldb::offset_t GetByteSize() const override
void Printf(const char *format,...) __attribute__((format(printf
Definition: Log.cpp:113
void ReadMemory(uint8_t *bytes, lldb::addr_t process_address, size_t size, Status &error)
An error handling class.
Definition: Status.h:44