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DataExtractor.cpp
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1 //===-- DataExtractor.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 
10 
11 #include "lldb/lldb-defines.h"
12 #include "lldb/lldb-enumerations.h"
13 #include "lldb/lldb-forward.h"
14 #include "lldb/lldb-types.h"
15 
19 #include "lldb/Utility/Log.h"
20 #include "lldb/Utility/Stream.h"
22 #include "lldb/Utility/UUID.h"
23 
24 #include "llvm/ADT/ArrayRef.h"
25 #include "llvm/ADT/SmallVector.h"
26 #include "llvm/Support/LEB128.h"
27 #include "llvm/Support/MD5.h"
28 #include "llvm/Support/MathExtras.h"
29 
30 #include <algorithm>
31 #include <array>
32 #include <cassert>
33 #include <cstdint>
34 #include <string>
35 
36 #include <cctype>
37 #include <cinttypes>
38 #include <cstring>
39 
40 using namespace lldb;
41 using namespace lldb_private;
42 
43 static inline uint16_t ReadInt16(const unsigned char *ptr, offset_t offset) {
44  uint16_t value;
45  memcpy(&value, ptr + offset, 2);
46  return value;
47 }
48 
49 static inline uint32_t ReadInt32(const unsigned char *ptr,
50  offset_t offset = 0) {
51  uint32_t value;
52  memcpy(&value, ptr + offset, 4);
53  return value;
54 }
55 
56 static inline uint64_t ReadInt64(const unsigned char *ptr,
57  offset_t offset = 0) {
58  uint64_t value;
59  memcpy(&value, ptr + offset, 8);
60  return value;
61 }
62 
63 static inline uint16_t ReadInt16(const void *ptr) {
64  uint16_t value;
65  memcpy(&value, ptr, 2);
66  return value;
67 }
68 
69 static inline uint16_t ReadSwapInt16(const unsigned char *ptr,
70  offset_t offset) {
71  uint16_t value;
72  memcpy(&value, ptr + offset, 2);
73  return llvm::ByteSwap_16(value);
74 }
75 
76 static inline uint32_t ReadSwapInt32(const unsigned char *ptr,
77  offset_t offset) {
78  uint32_t value;
79  memcpy(&value, ptr + offset, 4);
80  return llvm::ByteSwap_32(value);
81 }
82 
83 static inline uint64_t ReadSwapInt64(const unsigned char *ptr,
84  offset_t offset) {
85  uint64_t value;
86  memcpy(&value, ptr + offset, 8);
87  return llvm::ByteSwap_64(value);
88 }
89 
90 static inline uint16_t ReadSwapInt16(const void *ptr) {
91  uint16_t value;
92  memcpy(&value, ptr, 2);
93  return llvm::ByteSwap_16(value);
94 }
95 
96 static inline uint32_t ReadSwapInt32(const void *ptr) {
97  uint32_t value;
98  memcpy(&value, ptr, 4);
99  return llvm::ByteSwap_32(value);
100 }
101 
102 static inline uint64_t ReadSwapInt64(const void *ptr) {
103  uint64_t value;
104  memcpy(&value, ptr, 8);
105  return llvm::ByteSwap_64(value);
106 }
107 
108 static inline uint64_t ReadMaxInt64(const uint8_t *data, size_t byte_size,
109  ByteOrder byte_order) {
110  uint64_t res = 0;
111  if (byte_order == eByteOrderBig)
112  for (size_t i = 0; i < byte_size; ++i)
113  res = (res << 8) | data[i];
114  else {
115  assert(byte_order == eByteOrderLittle);
116  for (size_t i = 0; i < byte_size; ++i)
117  res = (res << 8) | data[byte_size - 1 - i];
118  }
119  return res;
120 }
121 
122 DataExtractor::DataExtractor()
123  : m_byte_order(endian::InlHostByteOrder()), m_addr_size(sizeof(void *)),
124  m_data_sp() {}
125 
126 // This constructor allows us to use data that is owned by someone else. The
127 // data must stay around as long as this object is valid.
128 DataExtractor::DataExtractor(const void *data, offset_t length,
129  ByteOrder endian, uint32_t addr_size,
130  uint32_t target_byte_size /*=1*/)
131  : m_start(const_cast<uint8_t *>(static_cast<const uint8_t *>(data))),
132  m_end(const_cast<uint8_t *>(static_cast<const uint8_t *>(data)) + length),
133  m_byte_order(endian), m_addr_size(addr_size), m_data_sp(),
134  m_target_byte_size(target_byte_size) {
135  assert(addr_size >= 1 && addr_size <= 8);
136 }
137 
138 // Make a shared pointer reference to the shared data in "data_sp" and set the
139 // endian swapping setting to "swap", and the address size to "addr_size". The
140 // shared data reference will ensure the data lives as long as any
141 // DataExtractor objects exist that have a reference to this data.
142 DataExtractor::DataExtractor(const DataBufferSP &data_sp, ByteOrder endian,
143  uint32_t addr_size,
144  uint32_t target_byte_size /*=1*/)
145  : m_start(nullptr), m_end(nullptr), m_byte_order(endian),
146  m_addr_size(addr_size), m_data_sp(),
147  m_target_byte_size(target_byte_size) {
148  assert(addr_size >= 1 && addr_size <= 8);
149  SetData(data_sp);
150 }
151 
152 // Initialize this object with a subset of the data bytes in "data". If "data"
153 // contains shared data, then a reference to this shared data will added and
154 // the shared data will stay around as long as any object contains a reference
155 // to that data. The endian swap and address size settings are copied from
156 // "data".
158  offset_t length, uint32_t target_byte_size /*=1*/)
159  : m_start(nullptr), m_end(nullptr), m_byte_order(data.m_byte_order),
160  m_addr_size(data.m_addr_size), m_data_sp(),
161  m_target_byte_size(target_byte_size) {
162  assert(m_addr_size >= 1 && m_addr_size <= 8);
163  if (data.ValidOffset(offset)) {
164  offset_t bytes_available = data.GetByteSize() - offset;
165  if (length > bytes_available)
166  length = bytes_available;
167  SetData(data, offset, length);
168  }
169 }
170 
172  : m_start(rhs.m_start), m_end(rhs.m_end), m_byte_order(rhs.m_byte_order),
173  m_addr_size(rhs.m_addr_size), m_data_sp(rhs.m_data_sp),
174  m_target_byte_size(rhs.m_target_byte_size) {
175  assert(m_addr_size >= 1 && m_addr_size <= 8);
176 }
177 
178 // Assignment operator
180  if (this != &rhs) {
181  m_start = rhs.m_start;
182  m_end = rhs.m_end;
184  m_addr_size = rhs.m_addr_size;
185  m_data_sp = rhs.m_data_sp;
186  }
187  return *this;
188 }
189 
191 
192 // Clears the object contents back to a default invalid state, and release any
193 // references to shared data that this object may contain.
195  m_start = nullptr;
196  m_end = nullptr;
198  m_addr_size = sizeof(void *);
199  m_data_sp.reset();
200 }
201 
202 // If this object contains shared data, this function returns the offset into
203 // that shared data. Else zero is returned.
205  if (m_start != nullptr) {
206  const DataBuffer *data = m_data_sp.get();
207  if (data != nullptr) {
208  const uint8_t *data_bytes = data->GetBytes();
209  if (data_bytes != nullptr) {
210  assert(m_start >= data_bytes);
211  return m_start - data_bytes;
212  }
213  }
214  }
215  return 0;
216 }
217 
218 // Set the data with which this object will extract from to data starting at
219 // BYTES and set the length of the data to LENGTH bytes long. The data is
220 // externally owned must be around at least as long as this object points to
221 // the data. No copy of the data is made, this object just refers to this data
222 // and can extract from it. If this object refers to any shared data upon
223 // entry, the reference to that data will be released. Is SWAP is set to true,
224 // any data extracted will be endian swapped.
226  ByteOrder endian) {
227  m_byte_order = endian;
228  m_data_sp.reset();
229  if (bytes == nullptr || length == 0) {
230  m_start = nullptr;
231  m_end = nullptr;
232  } else {
233  m_start = const_cast<uint8_t *>(static_cast<const uint8_t *>(bytes));
234  m_end = m_start + length;
235  }
236  return GetByteSize();
237 }
238 
239 // Assign the data for this object to be a subrange in "data" starting
240 // "data_offset" bytes into "data" and ending "data_length" bytes later. If
241 // "data_offset" is not a valid offset into "data", then this object will
242 // contain no bytes. If "data_offset" is within "data" yet "data_length" is too
243 // large, the length will be capped at the number of bytes remaining in "data".
244 // If "data" contains a shared pointer to other data, then a ref counted
245 // pointer to that data will be made in this object. If "data" doesn't contain
246 // a shared pointer to data, then the bytes referred to in "data" will need to
247 // exist at least as long as this object refers to those bytes. The address
248 // size and endian swap settings are copied from the current values in "data".
250  offset_t data_offset,
251  offset_t data_length) {
252  m_addr_size = data.m_addr_size;
253  assert(m_addr_size >= 1 && m_addr_size <= 8);
254  // If "data" contains shared pointer to data, then we can use that
255  if (data.m_data_sp) {
256  m_byte_order = data.m_byte_order;
257  return SetData(data.m_data_sp, data.GetSharedDataOffset() + data_offset,
258  data_length);
259  }
260 
261  // We have a DataExtractor object that just has a pointer to bytes
262  if (data.ValidOffset(data_offset)) {
263  if (data_length > data.GetByteSize() - data_offset)
264  data_length = data.GetByteSize() - data_offset;
265  return SetData(data.GetDataStart() + data_offset, data_length,
266  data.GetByteOrder());
267  }
268  return 0;
269 }
270 
271 // Assign the data for this object to be a subrange of the shared data in
272 // "data_sp" starting "data_offset" bytes into "data_sp" and ending
273 // "data_length" bytes later. If "data_offset" is not a valid offset into
274 // "data_sp", then this object will contain no bytes. If "data_offset" is
275 // within "data_sp" yet "data_length" is too large, the length will be capped
276 // at the number of bytes remaining in "data_sp". A ref counted pointer to the
277 // data in "data_sp" will be made in this object IF the number of bytes this
278 // object refers to in greater than zero (if at least one byte was available
279 // starting at "data_offset") to ensure the data stays around as long as it is
280 // needed. The address size and endian swap settings will remain unchanged from
281 // their current settings.
282 lldb::offset_t DataExtractor::SetData(const DataBufferSP &data_sp,
283  offset_t data_offset,
284  offset_t data_length) {
285  m_start = m_end = nullptr;
286 
287  if (data_length > 0) {
288  m_data_sp = data_sp;
289  if (data_sp) {
290  const size_t data_size = data_sp->GetByteSize();
291  if (data_offset < data_size) {
292  m_start = data_sp->GetBytes() + data_offset;
293  const size_t bytes_left = data_size - data_offset;
294  // Cap the length of we asked for too many
295  if (data_length <= bytes_left)
296  m_end = m_start + data_length; // We got all the bytes we wanted
297  else
298  m_end = m_start + bytes_left; // Not all the bytes requested were
299  // available in the shared data
300  }
301  }
302  }
303 
304  size_t new_size = GetByteSize();
305 
306  // Don't hold a shared pointer to the data buffer if we don't share any valid
307  // bytes in the shared buffer.
308  if (new_size == 0)
309  m_data_sp.reset();
310 
311  return new_size;
312 }
313 
314 // Extract a single unsigned char from the binary data and update the offset
315 // pointed to by "offset_ptr".
316 //
317 // RETURNS the byte that was extracted, or zero on failure.
318 uint8_t DataExtractor::GetU8(offset_t *offset_ptr) const {
319  const uint8_t *data = static_cast<const uint8_t *>(GetData(offset_ptr, 1));
320  if (data)
321  return *data;
322  return 0;
323 }
324 
325 // Extract "count" unsigned chars from the binary data and update the offset
326 // pointed to by "offset_ptr". The extracted data is copied into "dst".
327 //
328 // RETURNS the non-nullptr buffer pointer upon successful extraction of
329 // all the requested bytes, or nullptr when the data is not available in the
330 // buffer due to being out of bounds, or insufficient data.
331 void *DataExtractor::GetU8(offset_t *offset_ptr, void *dst,
332  uint32_t count) const {
333  const uint8_t *data =
334  static_cast<const uint8_t *>(GetData(offset_ptr, count));
335  if (data) {
336  // Copy the data into the buffer
337  memcpy(dst, data, count);
338  // Return a non-nullptr pointer to the converted data as an indicator of
339  // success
340  return dst;
341  }
342  return nullptr;
343 }
344 
345 // Extract a single uint16_t from the data and update the offset pointed to by
346 // "offset_ptr".
347 //
348 // RETURNS the uint16_t that was extracted, or zero on failure.
350  uint16_t val = 0;
351  const uint8_t *data =
352  static_cast<const uint8_t *>(GetData(offset_ptr, sizeof(val)));
353  if (data) {
355  val = ReadSwapInt16(data);
356  else
357  val = ReadInt16(data);
358  }
359  return val;
360 }
361 
363  uint16_t val;
365  val = ReadInt16(m_start, *offset_ptr);
366  else
367  val = ReadSwapInt16(m_start, *offset_ptr);
368  *offset_ptr += sizeof(val);
369  return val;
370 }
371 
373  uint32_t val;
375  val = ReadInt32(m_start, *offset_ptr);
376  else
377  val = ReadSwapInt32(m_start, *offset_ptr);
378  *offset_ptr += sizeof(val);
379  return val;
380 }
381 
382 uint64_t DataExtractor::GetU64_unchecked(offset_t *offset_ptr) const {
383  uint64_t val;
385  val = ReadInt64(m_start, *offset_ptr);
386  else
387  val = ReadSwapInt64(m_start, *offset_ptr);
388  *offset_ptr += sizeof(val);
389  return val;
390 }
391 
392 // Extract "count" uint16_t values from the binary data and update the offset
393 // pointed to by "offset_ptr". The extracted data is copied into "dst".
394 //
395 // RETURNS the non-nullptr buffer pointer upon successful extraction of
396 // all the requested bytes, or nullptr when the data is not available in the
397 // buffer due to being out of bounds, or insufficient data.
398 void *DataExtractor::GetU16(offset_t *offset_ptr, void *void_dst,
399  uint32_t count) const {
400  const size_t src_size = sizeof(uint16_t) * count;
401  const uint16_t *src =
402  static_cast<const uint16_t *>(GetData(offset_ptr, src_size));
403  if (src) {
405  uint16_t *dst_pos = static_cast<uint16_t *>(void_dst);
406  uint16_t *dst_end = dst_pos + count;
407  const uint16_t *src_pos = src;
408  while (dst_pos < dst_end) {
409  *dst_pos = ReadSwapInt16(src_pos);
410  ++dst_pos;
411  ++src_pos;
412  }
413  } else {
414  memcpy(void_dst, src, src_size);
415  }
416  // Return a non-nullptr pointer to the converted data as an indicator of
417  // success
418  return void_dst;
419  }
420  return nullptr;
421 }
422 
423 // Extract a single uint32_t from the data and update the offset pointed to by
424 // "offset_ptr".
425 //
426 // RETURNS the uint32_t that was extracted, or zero on failure.
428  uint32_t val = 0;
429  const uint8_t *data =
430  static_cast<const uint8_t *>(GetData(offset_ptr, sizeof(val)));
431  if (data) {
433  val = ReadSwapInt32(data);
434  } else {
435  memcpy(&val, data, 4);
436  }
437  }
438  return val;
439 }
440 
441 // Extract "count" uint32_t values from the binary data and update the offset
442 // pointed to by "offset_ptr". The extracted data is copied into "dst".
443 //
444 // RETURNS the non-nullptr buffer pointer upon successful extraction of
445 // all the requested bytes, or nullptr when the data is not available in the
446 // buffer due to being out of bounds, or insufficient data.
447 void *DataExtractor::GetU32(offset_t *offset_ptr, void *void_dst,
448  uint32_t count) const {
449  const size_t src_size = sizeof(uint32_t) * count;
450  const uint32_t *src =
451  static_cast<const uint32_t *>(GetData(offset_ptr, src_size));
452  if (src) {
454  uint32_t *dst_pos = static_cast<uint32_t *>(void_dst);
455  uint32_t *dst_end = dst_pos + count;
456  const uint32_t *src_pos = src;
457  while (dst_pos < dst_end) {
458  *dst_pos = ReadSwapInt32(src_pos);
459  ++dst_pos;
460  ++src_pos;
461  }
462  } else {
463  memcpy(void_dst, src, src_size);
464  }
465  // Return a non-nullptr pointer to the converted data as an indicator of
466  // success
467  return void_dst;
468  }
469  return nullptr;
470 }
471 
472 // Extract a single uint64_t from the data and update the offset pointed to by
473 // "offset_ptr".
474 //
475 // RETURNS the uint64_t that was extracted, or zero on failure.
476 uint64_t DataExtractor::GetU64(offset_t *offset_ptr) const {
477  uint64_t val = 0;
478  const uint8_t *data =
479  static_cast<const uint8_t *>(GetData(offset_ptr, sizeof(val)));
480  if (data) {
482  val = ReadSwapInt64(data);
483  } else {
484  memcpy(&val, data, 8);
485  }
486  }
487  return val;
488 }
489 
490 // GetU64
491 //
492 // Get multiple consecutive 64 bit values. Return true if the entire read
493 // succeeds and increment the offset pointed to by offset_ptr, else return
494 // false and leave the offset pointed to by offset_ptr unchanged.
495 void *DataExtractor::GetU64(offset_t *offset_ptr, void *void_dst,
496  uint32_t count) const {
497  const size_t src_size = sizeof(uint64_t) * count;
498  const uint64_t *src =
499  static_cast<const uint64_t *>(GetData(offset_ptr, src_size));
500  if (src) {
502  uint64_t *dst_pos = static_cast<uint64_t *>(void_dst);
503  uint64_t *dst_end = dst_pos + count;
504  const uint64_t *src_pos = src;
505  while (dst_pos < dst_end) {
506  *dst_pos = ReadSwapInt64(src_pos);
507  ++dst_pos;
508  ++src_pos;
509  }
510  } else {
511  memcpy(void_dst, src, src_size);
512  }
513  // Return a non-nullptr pointer to the converted data as an indicator of
514  // success
515  return void_dst;
516  }
517  return nullptr;
518 }
519 
521  size_t byte_size) const {
522  lldbassert(byte_size > 0 && byte_size <= 4 && "GetMaxU32 invalid byte_size!");
523  return GetMaxU64(offset_ptr, byte_size);
524 }
525 
526 uint64_t DataExtractor::GetMaxU64(offset_t *offset_ptr,
527  size_t byte_size) const {
528  lldbassert(byte_size > 0 && byte_size <= 8 && "GetMaxU64 invalid byte_size!");
529  switch (byte_size) {
530  case 1:
531  return GetU8(offset_ptr);
532  case 2:
533  return GetU16(offset_ptr);
534  case 4:
535  return GetU32(offset_ptr);
536  case 8:
537  return GetU64(offset_ptr);
538  default: {
539  // General case.
540  const uint8_t *data =
541  static_cast<const uint8_t *>(GetData(offset_ptr, byte_size));
542  if (data == nullptr)
543  return 0;
544  return ReadMaxInt64(data, byte_size, m_byte_order);
545  }
546  }
547  return 0;
548 }
549 
551  size_t byte_size) const {
552  switch (byte_size) {
553  case 1:
554  return GetU8_unchecked(offset_ptr);
555  case 2:
556  return GetU16_unchecked(offset_ptr);
557  case 4:
558  return GetU32_unchecked(offset_ptr);
559  case 8:
560  return GetU64_unchecked(offset_ptr);
561  default: {
562  uint64_t res = ReadMaxInt64(&m_start[*offset_ptr], byte_size, m_byte_order);
563  *offset_ptr += byte_size;
564  return res;
565  }
566  }
567  return 0;
568 }
569 
570 int64_t DataExtractor::GetMaxS64(offset_t *offset_ptr, size_t byte_size) const {
571  uint64_t u64 = GetMaxU64(offset_ptr, byte_size);
572  return llvm::SignExtend64(u64, 8 * byte_size);
573 }
574 
575 uint64_t DataExtractor::GetMaxU64Bitfield(offset_t *offset_ptr, size_t size,
576  uint32_t bitfield_bit_size,
577  uint32_t bitfield_bit_offset) const {
578  assert(bitfield_bit_size <= 64);
579  uint64_t uval64 = GetMaxU64(offset_ptr, size);
580 
581  if (bitfield_bit_size == 0)
582  return uval64;
583 
584  int32_t lsbcount = bitfield_bit_offset;
586  lsbcount = size * 8 - bitfield_bit_offset - bitfield_bit_size;
587 
588  if (lsbcount > 0)
589  uval64 >>= lsbcount;
590 
591  uint64_t bitfield_mask =
592  (bitfield_bit_size == 64
593  ? std::numeric_limits<uint64_t>::max()
594  : ((static_cast<uint64_t>(1) << bitfield_bit_size) - 1));
595  if (!bitfield_mask && bitfield_bit_offset == 0 && bitfield_bit_size == 64)
596  return uval64;
597 
598  uval64 &= bitfield_mask;
599 
600  return uval64;
601 }
602 
603 int64_t DataExtractor::GetMaxS64Bitfield(offset_t *offset_ptr, size_t size,
604  uint32_t bitfield_bit_size,
605  uint32_t bitfield_bit_offset) const {
606  assert(size >= 1 && "GetMaxS64Bitfield size must be >= 1");
607  assert(size <= 8 && "GetMaxS64Bitfield size must be <= 8");
608  int64_t sval64 = GetMaxS64(offset_ptr, size);
609  if (bitfield_bit_size == 0)
610  return sval64;
611  int32_t lsbcount = bitfield_bit_offset;
613  lsbcount = size * 8 - bitfield_bit_offset - bitfield_bit_size;
614  if (lsbcount > 0)
615  sval64 >>= lsbcount;
616  uint64_t bitfield_mask = llvm::maskTrailingOnes<uint64_t>(bitfield_bit_size);
617  sval64 &= bitfield_mask;
618  // sign extend if needed
619  if (sval64 & ((static_cast<uint64_t>(1)) << (bitfield_bit_size - 1)))
620  sval64 |= ~bitfield_mask;
621  return sval64;
622 }
623 
624 float DataExtractor::GetFloat(offset_t *offset_ptr) const {
625  return Get<float>(offset_ptr, 0.0f);
626 }
627 
628 double DataExtractor::GetDouble(offset_t *offset_ptr) const {
629  return Get<double>(offset_ptr, 0.0);
630 }
631 
632 long double DataExtractor::GetLongDouble(offset_t *offset_ptr) const {
633  long double val = 0.0;
634 #if defined(__i386__) || defined(__amd64__) || defined(__x86_64__) || \
635  defined(_M_IX86) || defined(_M_IA64) || defined(_M_X64)
636  *offset_ptr += CopyByteOrderedData(*offset_ptr, 10, &val, sizeof(val),
638 #else
639  *offset_ptr += CopyByteOrderedData(*offset_ptr, sizeof(val), &val,
640  sizeof(val), endian::InlHostByteOrder());
641 #endif
642  return val;
643 }
644 
645 // Extract a single address from the data and update the offset pointed to by
646 // "offset_ptr". The size of the extracted address comes from the
647 // "this->m_addr_size" member variable and should be set correctly prior to
648 // extracting any address values.
649 //
650 // RETURNS the address that was extracted, or zero on failure.
651 uint64_t DataExtractor::GetAddress(offset_t *offset_ptr) const {
652  assert(m_addr_size >= 1 && m_addr_size <= 8);
653  return GetMaxU64(offset_ptr, m_addr_size);
654 }
655 
656 uint64_t DataExtractor::GetAddress_unchecked(offset_t *offset_ptr) const {
657  assert(m_addr_size >= 1 && m_addr_size <= 8);
658  return GetMaxU64_unchecked(offset_ptr, m_addr_size);
659 }
660 
662  ByteOrder dst_byte_order, void *dst) const {
663  const uint8_t *src = PeekData(offset, length);
664  if (src) {
665  if (dst_byte_order != GetByteOrder()) {
666  // Validate that only a word- or register-sized dst is byte swapped
667  assert(length == 1 || length == 2 || length == 4 || length == 8 ||
668  length == 10 || length == 16 || length == 32);
669 
670  for (uint32_t i = 0; i < length; ++i)
671  (static_cast<uint8_t *>(dst))[i] = src[length - i - 1];
672  } else
673  ::memcpy(dst, src, length);
674  return length;
675  }
676  return 0;
677 }
678 
679 // Extract data as it exists in target memory
681  void *dst) const {
682  const uint8_t *src = PeekData(offset, length);
683  if (src) {
684  ::memcpy(dst, src, length);
685  return length;
686  }
687  return 0;
688 }
689 
690 // Extract data and swap if needed when doing the copy
693  void *dst_void_ptr, offset_t dst_len,
694  ByteOrder dst_byte_order) const {
695  // Validate the source info
696  if (!ValidOffsetForDataOfSize(src_offset, src_len))
697  assert(ValidOffsetForDataOfSize(src_offset, src_len));
698  assert(src_len > 0);
700 
701  // Validate the destination info
702  assert(dst_void_ptr != nullptr);
703  assert(dst_len > 0);
704  assert(dst_byte_order == eByteOrderBig || dst_byte_order == eByteOrderLittle);
705 
706  // Validate that only a word- or register-sized dst is byte swapped
707  assert(dst_byte_order == m_byte_order || dst_len == 1 || dst_len == 2 ||
708  dst_len == 4 || dst_len == 8 || dst_len == 10 || dst_len == 16 ||
709  dst_len == 32);
710 
711  // Must have valid byte orders set in this object and for destination
712  if (!(dst_byte_order == eByteOrderBig ||
713  dst_byte_order == eByteOrderLittle) ||
715  return 0;
716 
717  uint8_t *dst = static_cast<uint8_t *>(dst_void_ptr);
718  const uint8_t *src = PeekData(src_offset, src_len);
719  if (src) {
720  if (dst_len >= src_len) {
721  // We are copying the entire value from src into dst. Calculate how many,
722  // if any, zeroes we need for the most significant bytes if "dst_len" is
723  // greater than "src_len"...
724  const size_t num_zeroes = dst_len - src_len;
725  if (dst_byte_order == eByteOrderBig) {
726  // Big endian, so we lead with zeroes...
727  if (num_zeroes > 0)
728  ::memset(dst, 0, num_zeroes);
729  // Then either copy or swap the rest
730  if (m_byte_order == eByteOrderBig) {
731  ::memcpy(dst + num_zeroes, src, src_len);
732  } else {
733  for (uint32_t i = 0; i < src_len; ++i)
734  dst[i + num_zeroes] = src[src_len - 1 - i];
735  }
736  } else {
737  // Little endian destination, so we lead the value bytes
738  if (m_byte_order == eByteOrderBig) {
739  for (uint32_t i = 0; i < src_len; ++i)
740  dst[i] = src[src_len - 1 - i];
741  } else {
742  ::memcpy(dst, src, src_len);
743  }
744  // And zero the rest...
745  if (num_zeroes > 0)
746  ::memset(dst + src_len, 0, num_zeroes);
747  }
748  return src_len;
749  } else {
750  // We are only copying some of the value from src into dst..
751 
752  if (dst_byte_order == eByteOrderBig) {
753  // Big endian dst
754  if (m_byte_order == eByteOrderBig) {
755  // Big endian dst, with big endian src
756  ::memcpy(dst, src + (src_len - dst_len), dst_len);
757  } else {
758  // Big endian dst, with little endian src
759  for (uint32_t i = 0; i < dst_len; ++i)
760  dst[i] = src[dst_len - 1 - i];
761  }
762  } else {
763  // Little endian dst
764  if (m_byte_order == eByteOrderBig) {
765  // Little endian dst, with big endian src
766  for (uint32_t i = 0; i < dst_len; ++i)
767  dst[i] = src[src_len - 1 - i];
768  } else {
769  // Little endian dst, with big endian src
770  ::memcpy(dst, src, dst_len);
771  }
772  }
773  return dst_len;
774  }
775  }
776  return 0;
777 }
778 
779 // Extracts a variable length NULL terminated C string from the data at the
780 // offset pointed to by "offset_ptr". The "offset_ptr" will be updated with
781 // the offset of the byte that follows the NULL terminator byte.
782 //
783 // If the offset pointed to by "offset_ptr" is out of bounds, or if "length" is
784 // non-zero and there aren't enough available bytes, nullptr will be returned
785 // and "offset_ptr" will not be updated.
786 const char *DataExtractor::GetCStr(offset_t *offset_ptr) const {
787  const char *start = reinterpret_cast<const char *>(PeekData(*offset_ptr, 1));
788  // Already at the end of the data.
789  if (!start)
790  return nullptr;
791 
792  const char *end = reinterpret_cast<const char *>(m_end);
793 
794  // Check all bytes for a null terminator that terminates a C string.
795  const char *terminator_or_end = std::find(start, end, '\0');
796 
797  // We didn't find a null terminator, so return nullptr to indicate that there
798  // is no valid C string at that offset.
799  if (terminator_or_end == end)
800  return nullptr;
801 
802  // Update offset_ptr for the caller to point to the data behind the
803  // terminator (which is 1 byte long).
804  *offset_ptr += (terminator_or_end - start + 1UL);
805  return start;
806 }
807 
808 // Extracts a NULL terminated C string from the fixed length field of length
809 // "len" at the offset pointed to by "offset_ptr". The "offset_ptr" will be
810 // updated with the offset of the byte that follows the fixed length field.
811 //
812 // If the offset pointed to by "offset_ptr" is out of bounds, or if the offset
813 // plus the length of the field is out of bounds, or if the field does not
814 // contain a NULL terminator byte, nullptr will be returned and "offset_ptr"
815 // will not be updated.
816 const char *DataExtractor::GetCStr(offset_t *offset_ptr, offset_t len) const {
817  const char *cstr = reinterpret_cast<const char *>(PeekData(*offset_ptr, len));
818  if (cstr != nullptr) {
819  if (memchr(cstr, '\0', len) == nullptr) {
820  return nullptr;
821  }
822  *offset_ptr += len;
823  return cstr;
824  }
825  return nullptr;
826 }
827 
828 // Peeks at a string in the contained data. No verification is done to make
829 // sure the entire string lies within the bounds of this object's data, only
830 // "offset" is verified to be a valid offset.
831 //
832 // Returns a valid C string pointer if "offset" is a valid offset in this
833 // object's data, else nullptr is returned.
834 const char *DataExtractor::PeekCStr(offset_t offset) const {
835  return reinterpret_cast<const char *>(PeekData(offset, 1));
836 }
837 
838 // Extracts an unsigned LEB128 number from this object's data starting at the
839 // offset pointed to by "offset_ptr". The offset pointed to by "offset_ptr"
840 // will be updated with the offset of the byte following the last extracted
841 // byte.
842 //
843 // Returned the extracted integer value.
844 uint64_t DataExtractor::GetULEB128(offset_t *offset_ptr) const {
845  const uint8_t *src = PeekData(*offset_ptr, 1);
846  if (src == nullptr)
847  return 0;
848 
849  unsigned byte_count = 0;
850  uint64_t result = llvm::decodeULEB128(src, &byte_count, m_end);
851  *offset_ptr += byte_count;
852  return result;
853 }
854 
855 // Extracts an signed LEB128 number from this object's data starting at the
856 // offset pointed to by "offset_ptr". The offset pointed to by "offset_ptr"
857 // will be updated with the offset of the byte following the last extracted
858 // byte.
859 //
860 // Returned the extracted integer value.
861 int64_t DataExtractor::GetSLEB128(offset_t *offset_ptr) const {
862  const uint8_t *src = PeekData(*offset_ptr, 1);
863  if (src == nullptr)
864  return 0;
865 
866  unsigned byte_count = 0;
867  int64_t result = llvm::decodeSLEB128(src, &byte_count, m_end);
868  *offset_ptr += byte_count;
869  return result;
870 }
871 
872 // Skips a ULEB128 number (signed or unsigned) from this object's data starting
873 // at the offset pointed to by "offset_ptr". The offset pointed to by
874 // "offset_ptr" will be updated with the offset of the byte following the last
875 // extracted byte.
876 //
877 // Returns the number of bytes consumed during the extraction.
879  uint32_t bytes_consumed = 0;
880  const uint8_t *src = PeekData(*offset_ptr, 1);
881  if (src == nullptr)
882  return 0;
883 
884  const uint8_t *end = m_end;
885 
886  if (src < end) {
887  const uint8_t *src_pos = src;
888  while ((src_pos < end) && (*src_pos++ & 0x80))
889  ++bytes_consumed;
890  *offset_ptr += src_pos - src;
891  }
892  return bytes_consumed;
893 }
894 
895 // Dumps bytes from this object's data to the stream "s" starting
896 // "start_offset" bytes into this data, and ending with the byte before
897 // "end_offset". "base_addr" will be added to the offset into the dumped data
898 // when showing the offset into the data in the output information.
899 // "num_per_line" objects of type "type" will be dumped with the option to
900 // override the format for each object with "type_format". "type_format" is a
901 // printf style formatting string. If "type_format" is nullptr, then an
902 // appropriate format string will be used for the supplied "type". If the
903 // stream "s" is nullptr, then the output will be send to Log().
905  offset_t length, uint64_t base_addr,
906  uint32_t num_per_line,
907  DataExtractor::Type type) const {
908  if (log == nullptr)
909  return start_offset;
910 
911  offset_t offset;
912  offset_t end_offset;
913  uint32_t count;
914  StreamString sstr;
915  for (offset = start_offset, end_offset = offset + length, count = 0;
916  ValidOffset(offset) && offset < end_offset; ++count) {
917  if ((count % num_per_line) == 0) {
918  // Print out any previous string
919  if (sstr.GetSize() > 0) {
920  log->PutString(sstr.GetString());
921  sstr.Clear();
922  }
923  // Reset string offset and fill the current line string with address:
924  if (base_addr != LLDB_INVALID_ADDRESS)
925  sstr.Printf("0x%8.8" PRIx64 ":",
926  static_cast<uint64_t>(base_addr + (offset - start_offset)));
927  }
928 
929  switch (type) {
930  case TypeUInt8:
931  sstr.Printf(" %2.2x", GetU8(&offset));
932  break;
933  case TypeChar: {
934  char ch = GetU8(&offset);
935  sstr.Printf(" %c", llvm::isPrint(ch) ? ch : ' ');
936  } break;
937  case TypeUInt16:
938  sstr.Printf(" %4.4x", GetU16(&offset));
939  break;
940  case TypeUInt32:
941  sstr.Printf(" %8.8x", GetU32(&offset));
942  break;
943  case TypeUInt64:
944  sstr.Printf(" %16.16" PRIx64, GetU64(&offset));
945  break;
946  case TypePointer:
947  sstr.Printf(" 0x%" PRIx64, GetAddress(&offset));
948  break;
949  case TypeULEB128:
950  sstr.Printf(" 0x%" PRIx64, GetULEB128(&offset));
951  break;
952  case TypeSLEB128:
953  sstr.Printf(" %" PRId64, GetSLEB128(&offset));
954  break;
955  }
956  }
957 
958  if (!sstr.Empty())
959  log->PutString(sstr.GetString());
960 
961  return offset; // Return the offset at which we ended up
962 }
963 
964 size_t DataExtractor::Copy(DataExtractor &dest_data) const {
965  if (m_data_sp) {
966  // we can pass along the SP to the data
967  dest_data.SetData(m_data_sp);
968  } else {
969  const uint8_t *base_ptr = m_start;
970  size_t data_size = GetByteSize();
971  dest_data.SetData(DataBufferSP(new DataBufferHeap(base_ptr, data_size)));
972  }
973  return GetByteSize();
974 }
975 
977  if (rhs.GetByteOrder() != GetByteOrder())
978  return false;
979 
980  if (rhs.GetByteSize() == 0)
981  return true;
982 
983  if (GetByteSize() == 0)
984  return (rhs.Copy(*this) > 0);
985 
986  size_t bytes = GetByteSize() + rhs.GetByteSize();
987 
988  DataBufferHeap *buffer_heap_ptr = nullptr;
989  DataBufferSP buffer_sp(buffer_heap_ptr = new DataBufferHeap(bytes, 0));
990 
991  if (!buffer_sp || buffer_heap_ptr == nullptr)
992  return false;
993 
994  uint8_t *bytes_ptr = buffer_heap_ptr->GetBytes();
995 
996  memcpy(bytes_ptr, GetDataStart(), GetByteSize());
997  memcpy(bytes_ptr + GetByteSize(), rhs.GetDataStart(), rhs.GetByteSize());
998 
999  SetData(buffer_sp);
1000 
1001  return true;
1002 }
1003 
1004 bool DataExtractor::Append(void *buf, offset_t length) {
1005  if (buf == nullptr)
1006  return false;
1007 
1008  if (length == 0)
1009  return true;
1010 
1011  size_t bytes = GetByteSize() + length;
1012 
1013  DataBufferHeap *buffer_heap_ptr = nullptr;
1014  DataBufferSP buffer_sp(buffer_heap_ptr = new DataBufferHeap(bytes, 0));
1015 
1016  if (!buffer_sp || buffer_heap_ptr == nullptr)
1017  return false;
1018 
1019  uint8_t *bytes_ptr = buffer_heap_ptr->GetBytes();
1020 
1021  if (GetByteSize() > 0)
1022  memcpy(bytes_ptr, GetDataStart(), GetByteSize());
1023 
1024  memcpy(bytes_ptr + GetByteSize(), buf, length);
1025 
1026  SetData(buffer_sp);
1027 
1028  return true;
1029 }
1030 
1032  uint64_t max_data) {
1033  if (max_data == 0)
1034  max_data = GetByteSize();
1035  else
1036  max_data = std::min(max_data, GetByteSize());
1037 
1038  llvm::MD5 md5;
1039 
1040  const llvm::ArrayRef<uint8_t> data(GetDataStart(), max_data);
1041  md5.update(data);
1042 
1043  llvm::MD5::MD5Result result;
1044  md5.final(result);
1045 
1046  dest.clear();
1047  dest.append(result.Bytes.begin(), result.Bytes.end());
1048 }
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Definition: DataExtractor.cpp:76
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Dumps the binary data as type objects to stream s (or to Log() if s is nullptr) starting offset bytes...
Definition: DataExtractor.cpp:904
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uint64_t GetULEB128(lldb::offset_t *offset_ptr) const
Extract a unsigned LEB128 value from *offset_ptr.
Definition: DataExtractor.cpp:844
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uint8_t * GetBytes() override
Definition: DataBufferHeap.cpp:34
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Definition: Log.cpp:119
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Extract an address from *offset_ptr.
Definition: DataExtractor.cpp:651
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uint32_t m_addr_size
The address size to use when extracting addresses.
Definition: DataExtractor.h:1016
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bool ValidOffset(lldb::offset_t offset) const
Test the validity of offset.
Definition: DataExtractor.h:956
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@ TypeUInt16
Format output as unsigned 16 bit integers.
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Definition: DataExtractor.cpp:49
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Definition: DataExtractor.cpp:964
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Peek at a bytes at offset.
Definition: DataExtractor.h:832
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Definition: DataExtractor.h:1012
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Definition: DataExtractor.cpp:362
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Definition: DataExtractor.cpp:976
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Definition: DataExtractor.cpp:83
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Extract an arbitrary number of bytes in the specified byte order.
Definition: DataExtractor.cpp:661
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Definition: DataExtractor.cpp:108
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Definition: DataExtractor.h:58
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Definition: DataExtractor.cpp:225
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Definition: StreamString.cpp:51
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Peek at a C string at offset.
Definition: DataExtractor.cpp:834
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Definition: StreamString.cpp:38
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Extract a signed LEB128 value from *offset_ptr.
Definition: DataExtractor.cpp:861
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@ TypeSLEB128
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Definition: DataExtractor.h:60
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Definition: DataExtractor.h:48
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Definition: DataExtractor.cpp:56
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Definition: DataExtractor.cpp:520
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Definition: DataExtractor.cpp:570
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Definition: DataExtractor.cpp:628
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Definition: DataExtractor.h:422
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Get the current byte order value.
Definition: DataExtractor.h:594
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Definition: StreamString.h:23
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Definition: DataExtractor.cpp:318
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Definition: DataExtractor.cpp:122
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Definition: StreamString.cpp:36
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Extract a float from *offset_ptr.
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Skip an LEB128 number at *offset_ptr.
Definition: DataExtractor.cpp:878
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Definition: DataExtractor.cpp:69
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Definition: DataExtractor.h:1018
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Definition: LLDBAssert.h:15
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lldb_private::DataExtractor::GetMaxS64Bitfield
int64_t GetMaxS64Bitfield(lldb::offset_t *offset_ptr, size_t size, uint32_t bitfield_bit_size, uint32_t bitfield_bit_offset) const
Extract an signed integer of size size from *offset_ptr, then extract and sign-extend the bitfield fr...
Definition: DataExtractor.cpp:603
uint16_t
lldb_private::DataExtractor::GetU32
uint32_t GetU32(lldb::offset_t *offset_ptr) const
Extract a uint32_t value from *offset_ptr.
Definition: DataExtractor.cpp:427
LLDB_INVALID_ADDRESS
#define LLDB_INVALID_ADDRESS
Definition: lldb-defines.h:86
DataExtractor.h
lldb_private::Stream::Printf
size_t Printf(const char *format,...) __attribute__((format(printf
Output printf formatted output to the stream.
Definition: Stream.cpp:107
lldb-forward.h
lldb_private::DataExtractor::GetMaxU64Bitfield
uint64_t GetMaxU64Bitfield(lldb::offset_t *offset_ptr, size_t size, uint32_t bitfield_bit_size, uint32_t bitfield_bit_offset) const
Extract an unsigned integer of size byte_size from *offset_ptr, then extract the bitfield from this v...
Definition: DataExtractor.cpp:575
lldb_private::DataExtractor::CopyData
lldb::offset_t CopyData(lldb::offset_t offset, lldb::offset_t length, void *dst) const
Copy length bytes from *offset, without swapping bytes.
Definition: DataExtractor.cpp:680
lldb_private
A class that represents a running process on the host machine.
Definition: SBCommandInterpreterRunOptions.h:16
lldb_private::DataExtractor::GetU16
uint16_t GetU16(lldb::offset_t *offset_ptr) const
Extract a uint16_t value from *offset_ptr.
Definition: DataExtractor.cpp:349
lldb_private::DataExtractor::GetLongDouble
long double GetLongDouble(lldb::offset_t *offset_ptr) const
Definition: DataExtractor.cpp:632
lldb_private::DataExtractor::GetCStr
const char * GetCStr(lldb::offset_t *offset_ptr) const
Extract a C string from *offset_ptr.
Definition: DataExtractor.cpp:786
lldb_private::DataExtractor::TypeUInt32
@ TypeUInt32
Format output as unsigned 32 bit integers.
Definition: DataExtractor.h:56
lldb::eByteOrderBig
@ eByteOrderBig
Definition: lldb-enumerations.h:140
lldb_private::DataExtractor::CopyByteOrderedData
lldb::offset_t CopyByteOrderedData(lldb::offset_t src_offset, lldb::offset_t src_len, void *dst, lldb::offset_t dst_len, lldb::ByteOrder dst_byte_order) const
Copy dst_len bytes from *offset_ptr and ensure the copied data is treated as a value that can be swap...
Definition: DataExtractor.cpp:692
lldb_private::DataExtractor::Clear
void Clear()
Clears the object state.
Definition: DataExtractor.cpp:194
lldb_private::DataExtractor::GetU64_unchecked
uint64_t GetU64_unchecked(lldb::offset_t *offset_ptr) const
Definition: DataExtractor.cpp:382
Stream.h
lldb_private::Log
Definition: Log.h:49
lldb_private::DataExtractor::TypeUInt64
@ TypeUInt64
Format output as unsigned 64 bit integers.
Definition: DataExtractor.h:57
llvm::SmallVectorImpl
Definition: Disassembler.h:42
lldb_private::DataExtractor::Checksum
void Checksum(llvm::SmallVectorImpl< uint8_t > &dest, uint64_t max_data=0)
Definition: DataExtractor.cpp:1031
lldb_private::DataExtractor::TypeChar
@ TypeChar
Format output as characters.
Definition: DataExtractor.h:54
DataBuffer.h
lldb_private::DataExtractor::GetByteSize
uint64_t GetByteSize() const
Get the number of bytes contained in this object.
Definition: DataExtractor.h:270
lldb::eByteOrderLittle
@ eByteOrderLittle
Definition: lldb-enumerations.h:142
lldb_private::DataBufferHeap
Definition: DataBufferHeap.h:30
lldb_private::DataExtractor::m_byte_order
lldb::ByteOrder m_byte_order
The byte order of the data we are extracting from.
Definition: DataExtractor.h:1015
lldb_private::DataExtractor::ValidOffsetForDataOfSize
bool ValidOffsetForDataOfSize(lldb::offset_t offset, lldb::offset_t length) const
Test the availability of length bytes of data from offset.
Definition: DataExtractor.h:965
lldb
Definition: SBAddress.h:15
lldb_private::DataExtractor::operator=
const DataExtractor & operator=(const DataExtractor &rhs)
Assignment operator.
Definition: DataExtractor.cpp:179
lldb_private::DataExtractor::TypeUInt8
@ TypeUInt8
Format output as unsigned 8 bit integers.
Definition: DataExtractor.h:53
DataBufferHeap.h
lldb_private::DataExtractor::GetU32_unchecked
uint32_t GetU32_unchecked(lldb::offset_t *offset_ptr) const
Definition: DataExtractor.cpp:372
lldb::ByteOrder
ByteOrder
Byte ordering definitions.
Definition: lldb-enumerations.h:138
lldb_private::DataExtractor::TypeULEB128
@ TypeULEB128
Format output as ULEB128 numbers.
Definition: DataExtractor.h:59