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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_byte_order(endian), m_addr_size(addr_size), m_data_sp(),
146  m_target_byte_size(target_byte_size) {
147  assert(addr_size >= 1 && addr_size <= 8);
148  SetData(data_sp);
149 }
150 
151 // Initialize this object with a subset of the data bytes in "data". If "data"
152 // contains shared data, then a reference to this shared data will added and
153 // the shared data will stay around as long as any object contains a reference
154 // to that data. The endian swap and address size settings are copied from
155 // "data".
157  offset_t length, uint32_t target_byte_size /*=1*/)
158  : m_byte_order(data.m_byte_order), m_addr_size(data.m_addr_size),
159  m_data_sp(), m_target_byte_size(target_byte_size) {
160  assert(m_addr_size >= 1 && m_addr_size <= 8);
161  if (data.ValidOffset(offset)) {
162  offset_t bytes_available = data.GetByteSize() - offset;
163  if (length > bytes_available)
164  length = bytes_available;
165  SetData(data, offset, length);
166  }
167 }
168 
170  : m_start(rhs.m_start), m_end(rhs.m_end), m_byte_order(rhs.m_byte_order),
171  m_addr_size(rhs.m_addr_size), m_data_sp(rhs.m_data_sp),
172  m_target_byte_size(rhs.m_target_byte_size) {
173  assert(m_addr_size >= 1 && m_addr_size <= 8);
174 }
175 
176 // Assignment operator
178  if (this != &rhs) {
179  m_start = rhs.m_start;
180  m_end = rhs.m_end;
182  m_addr_size = rhs.m_addr_size;
183  m_data_sp = rhs.m_data_sp;
184  }
185  return *this;
186 }
187 
189 
190 // Clears the object contents back to a default invalid state, and release any
191 // references to shared data that this object may contain.
193  m_start = nullptr;
194  m_end = nullptr;
196  m_addr_size = sizeof(void *);
197  m_data_sp.reset();
198 }
199 
200 // If this object contains shared data, this function returns the offset into
201 // that shared data. Else zero is returned.
203  if (m_start != nullptr) {
204  const DataBuffer *data = m_data_sp.get();
205  if (data != nullptr) {
206  const uint8_t *data_bytes = data->GetBytes();
207  if (data_bytes != nullptr) {
208  assert(m_start >= data_bytes);
209  return m_start - data_bytes;
210  }
211  }
212  }
213  return 0;
214 }
215 
216 // Set the data with which this object will extract from to data starting at
217 // BYTES and set the length of the data to LENGTH bytes long. The data is
218 // externally owned must be around at least as long as this object points to
219 // the data. No copy of the data is made, this object just refers to this data
220 // and can extract from it. If this object refers to any shared data upon
221 // entry, the reference to that data will be released. Is SWAP is set to true,
222 // any data extracted will be endian swapped.
224  ByteOrder endian) {
225  m_byte_order = endian;
226  m_data_sp.reset();
227  if (bytes == nullptr || length == 0) {
228  m_start = nullptr;
229  m_end = nullptr;
230  } else {
231  m_start = const_cast<uint8_t *>(static_cast<const uint8_t *>(bytes));
232  m_end = m_start + length;
233  }
234  return GetByteSize();
235 }
236 
237 // Assign the data for this object to be a subrange in "data" starting
238 // "data_offset" bytes into "data" and ending "data_length" bytes later. If
239 // "data_offset" is not a valid offset into "data", then this object will
240 // contain no bytes. If "data_offset" is within "data" yet "data_length" is too
241 // large, the length will be capped at the number of bytes remaining in "data".
242 // If "data" contains a shared pointer to other data, then a ref counted
243 // pointer to that data will be made in this object. If "data" doesn't contain
244 // a shared pointer to data, then the bytes referred to in "data" will need to
245 // exist at least as long as this object refers to those bytes. The address
246 // size and endian swap settings are copied from the current values in "data".
248  offset_t data_offset,
249  offset_t data_length) {
250  m_addr_size = data.m_addr_size;
251  assert(m_addr_size >= 1 && m_addr_size <= 8);
252  // If "data" contains shared pointer to data, then we can use that
253  if (data.m_data_sp) {
254  m_byte_order = data.m_byte_order;
255  return SetData(data.m_data_sp, data.GetSharedDataOffset() + data_offset,
256  data_length);
257  }
258 
259  // We have a DataExtractor object that just has a pointer to bytes
260  if (data.ValidOffset(data_offset)) {
261  if (data_length > data.GetByteSize() - data_offset)
262  data_length = data.GetByteSize() - data_offset;
263  return SetData(data.GetDataStart() + data_offset, data_length,
264  data.GetByteOrder());
265  }
266  return 0;
267 }
268 
269 // Assign the data for this object to be a subrange of the shared data in
270 // "data_sp" starting "data_offset" bytes into "data_sp" and ending
271 // "data_length" bytes later. If "data_offset" is not a valid offset into
272 // "data_sp", then this object will contain no bytes. If "data_offset" is
273 // within "data_sp" yet "data_length" is too large, the length will be capped
274 // at the number of bytes remaining in "data_sp". A ref counted pointer to the
275 // data in "data_sp" will be made in this object IF the number of bytes this
276 // object refers to in greater than zero (if at least one byte was available
277 // starting at "data_offset") to ensure the data stays around as long as it is
278 // needed. The address size and endian swap settings will remain unchanged from
279 // their current settings.
280 lldb::offset_t DataExtractor::SetData(const DataBufferSP &data_sp,
281  offset_t data_offset,
282  offset_t data_length) {
283  m_start = m_end = nullptr;
284 
285  if (data_length > 0) {
286  m_data_sp = data_sp;
287  if (data_sp) {
288  const size_t data_size = data_sp->GetByteSize();
289  if (data_offset < data_size) {
290  m_start = data_sp->GetBytes() + data_offset;
291  const size_t bytes_left = data_size - data_offset;
292  // Cap the length of we asked for too many
293  if (data_length <= bytes_left)
294  m_end = m_start + data_length; // We got all the bytes we wanted
295  else
296  m_end = m_start + bytes_left; // Not all the bytes requested were
297  // available in the shared data
298  }
299  }
300  }
301 
302  size_t new_size = GetByteSize();
303 
304  // Don't hold a shared pointer to the data buffer if we don't share any valid
305  // bytes in the shared buffer.
306  if (new_size == 0)
307  m_data_sp.reset();
308 
309  return new_size;
310 }
311 
312 // Extract a single unsigned char from the binary data and update the offset
313 // pointed to by "offset_ptr".
314 //
315 // RETURNS the byte that was extracted, or zero on failure.
316 uint8_t DataExtractor::GetU8(offset_t *offset_ptr) const {
317  const uint8_t *data = static_cast<const uint8_t *>(GetData(offset_ptr, 1));
318  if (data)
319  return *data;
320  return 0;
321 }
322 
323 // Extract "count" unsigned chars from the binary data and update the offset
324 // pointed to by "offset_ptr". The extracted data is copied into "dst".
325 //
326 // RETURNS the non-nullptr buffer pointer upon successful extraction of
327 // all the requested bytes, or nullptr when the data is not available in the
328 // buffer due to being out of bounds, or insufficient data.
329 void *DataExtractor::GetU8(offset_t *offset_ptr, void *dst,
330  uint32_t count) const {
331  const uint8_t *data =
332  static_cast<const uint8_t *>(GetData(offset_ptr, count));
333  if (data) {
334  // Copy the data into the buffer
335  memcpy(dst, data, count);
336  // Return a non-nullptr pointer to the converted data as an indicator of
337  // success
338  return dst;
339  }
340  return nullptr;
341 }
342 
343 // Extract a single uint16_t from the data and update the offset pointed to by
344 // "offset_ptr".
345 //
346 // RETURNS the uint16_t that was extracted, or zero on failure.
348  uint16_t val = 0;
349  const uint8_t *data =
350  static_cast<const uint8_t *>(GetData(offset_ptr, sizeof(val)));
351  if (data) {
353  val = ReadSwapInt16(data);
354  else
355  val = ReadInt16(data);
356  }
357  return val;
358 }
359 
361  uint16_t val;
363  val = ReadInt16(m_start, *offset_ptr);
364  else
365  val = ReadSwapInt16(m_start, *offset_ptr);
366  *offset_ptr += sizeof(val);
367  return val;
368 }
369 
371  uint32_t val;
373  val = ReadInt32(m_start, *offset_ptr);
374  else
375  val = ReadSwapInt32(m_start, *offset_ptr);
376  *offset_ptr += sizeof(val);
377  return val;
378 }
379 
380 uint64_t DataExtractor::GetU64_unchecked(offset_t *offset_ptr) const {
381  uint64_t val;
383  val = ReadInt64(m_start, *offset_ptr);
384  else
385  val = ReadSwapInt64(m_start, *offset_ptr);
386  *offset_ptr += sizeof(val);
387  return val;
388 }
389 
390 // Extract "count" uint16_t values from the binary data and update the offset
391 // pointed to by "offset_ptr". The extracted data is copied into "dst".
392 //
393 // RETURNS the non-nullptr buffer pointer upon successful extraction of
394 // all the requested bytes, or nullptr when the data is not available in the
395 // buffer due to being out of bounds, or insufficient data.
396 void *DataExtractor::GetU16(offset_t *offset_ptr, void *void_dst,
397  uint32_t count) const {
398  const size_t src_size = sizeof(uint16_t) * count;
399  const uint16_t *src =
400  static_cast<const uint16_t *>(GetData(offset_ptr, src_size));
401  if (src) {
403  uint16_t *dst_pos = static_cast<uint16_t *>(void_dst);
404  uint16_t *dst_end = dst_pos + count;
405  const uint16_t *src_pos = src;
406  while (dst_pos < dst_end) {
407  *dst_pos = ReadSwapInt16(src_pos);
408  ++dst_pos;
409  ++src_pos;
410  }
411  } else {
412  memcpy(void_dst, src, src_size);
413  }
414  // Return a non-nullptr pointer to the converted data as an indicator of
415  // success
416  return void_dst;
417  }
418  return nullptr;
419 }
420 
421 // Extract a single uint32_t from the data and update the offset pointed to by
422 // "offset_ptr".
423 //
424 // RETURNS the uint32_t that was extracted, or zero on failure.
426  uint32_t val = 0;
427  const uint8_t *data =
428  static_cast<const uint8_t *>(GetData(offset_ptr, sizeof(val)));
429  if (data) {
431  val = ReadSwapInt32(data);
432  } else {
433  memcpy(&val, data, 4);
434  }
435  }
436  return val;
437 }
438 
439 // Extract "count" uint32_t values from the binary data and update the offset
440 // pointed to by "offset_ptr". The extracted data is copied into "dst".
441 //
442 // RETURNS the non-nullptr buffer pointer upon successful extraction of
443 // all the requested bytes, or nullptr when the data is not available in the
444 // buffer due to being out of bounds, or insufficient data.
445 void *DataExtractor::GetU32(offset_t *offset_ptr, void *void_dst,
446  uint32_t count) const {
447  const size_t src_size = sizeof(uint32_t) * count;
448  const uint32_t *src =
449  static_cast<const uint32_t *>(GetData(offset_ptr, src_size));
450  if (src) {
452  uint32_t *dst_pos = static_cast<uint32_t *>(void_dst);
453  uint32_t *dst_end = dst_pos + count;
454  const uint32_t *src_pos = src;
455  while (dst_pos < dst_end) {
456  *dst_pos = ReadSwapInt32(src_pos);
457  ++dst_pos;
458  ++src_pos;
459  }
460  } else {
461  memcpy(void_dst, src, src_size);
462  }
463  // Return a non-nullptr pointer to the converted data as an indicator of
464  // success
465  return void_dst;
466  }
467  return nullptr;
468 }
469 
470 // Extract a single uint64_t from the data and update the offset pointed to by
471 // "offset_ptr".
472 //
473 // RETURNS the uint64_t that was extracted, or zero on failure.
474 uint64_t DataExtractor::GetU64(offset_t *offset_ptr) const {
475  uint64_t val = 0;
476  const uint8_t *data =
477  static_cast<const uint8_t *>(GetData(offset_ptr, sizeof(val)));
478  if (data) {
480  val = ReadSwapInt64(data);
481  } else {
482  memcpy(&val, data, 8);
483  }
484  }
485  return val;
486 }
487 
488 // GetU64
489 //
490 // Get multiple consecutive 64 bit values. Return true if the entire read
491 // succeeds and increment the offset pointed to by offset_ptr, else return
492 // false and leave the offset pointed to by offset_ptr unchanged.
493 void *DataExtractor::GetU64(offset_t *offset_ptr, void *void_dst,
494  uint32_t count) const {
495  const size_t src_size = sizeof(uint64_t) * count;
496  const uint64_t *src =
497  static_cast<const uint64_t *>(GetData(offset_ptr, src_size));
498  if (src) {
500  uint64_t *dst_pos = static_cast<uint64_t *>(void_dst);
501  uint64_t *dst_end = dst_pos + count;
502  const uint64_t *src_pos = src;
503  while (dst_pos < dst_end) {
504  *dst_pos = ReadSwapInt64(src_pos);
505  ++dst_pos;
506  ++src_pos;
507  }
508  } else {
509  memcpy(void_dst, src, src_size);
510  }
511  // Return a non-nullptr pointer to the converted data as an indicator of
512  // success
513  return void_dst;
514  }
515  return nullptr;
516 }
517 
519  size_t byte_size) const {
520  lldbassert(byte_size > 0 && byte_size <= 4 && "GetMaxU32 invalid byte_size!");
521  return GetMaxU64(offset_ptr, byte_size);
522 }
523 
524 uint64_t DataExtractor::GetMaxU64(offset_t *offset_ptr,
525  size_t byte_size) const {
526  lldbassert(byte_size > 0 && byte_size <= 8 && "GetMaxU64 invalid byte_size!");
527  switch (byte_size) {
528  case 1:
529  return GetU8(offset_ptr);
530  case 2:
531  return GetU16(offset_ptr);
532  case 4:
533  return GetU32(offset_ptr);
534  case 8:
535  return GetU64(offset_ptr);
536  default: {
537  // General case.
538  const uint8_t *data =
539  static_cast<const uint8_t *>(GetData(offset_ptr, byte_size));
540  if (data == nullptr)
541  return 0;
542  return ReadMaxInt64(data, byte_size, m_byte_order);
543  }
544  }
545  return 0;
546 }
547 
549  size_t byte_size) const {
550  switch (byte_size) {
551  case 1:
552  return GetU8_unchecked(offset_ptr);
553  case 2:
554  return GetU16_unchecked(offset_ptr);
555  case 4:
556  return GetU32_unchecked(offset_ptr);
557  case 8:
558  return GetU64_unchecked(offset_ptr);
559  default: {
560  uint64_t res = ReadMaxInt64(&m_start[*offset_ptr], byte_size, m_byte_order);
561  *offset_ptr += byte_size;
562  return res;
563  }
564  }
565  return 0;
566 }
567 
568 int64_t DataExtractor::GetMaxS64(offset_t *offset_ptr, size_t byte_size) const {
569  uint64_t u64 = GetMaxU64(offset_ptr, byte_size);
570  return llvm::SignExtend64(u64, 8 * byte_size);
571 }
572 
573 uint64_t DataExtractor::GetMaxU64Bitfield(offset_t *offset_ptr, size_t size,
574  uint32_t bitfield_bit_size,
575  uint32_t bitfield_bit_offset) const {
576  assert(bitfield_bit_size <= 64);
577  uint64_t uval64 = GetMaxU64(offset_ptr, size);
578 
579  if (bitfield_bit_size == 0)
580  return uval64;
581 
582  int32_t lsbcount = bitfield_bit_offset;
584  lsbcount = size * 8 - bitfield_bit_offset - bitfield_bit_size;
585 
586  if (lsbcount > 0)
587  uval64 >>= lsbcount;
588 
589  uint64_t bitfield_mask =
590  (bitfield_bit_size == 64
591  ? std::numeric_limits<uint64_t>::max()
592  : ((static_cast<uint64_t>(1) << bitfield_bit_size) - 1));
593  if (!bitfield_mask && bitfield_bit_offset == 0 && bitfield_bit_size == 64)
594  return uval64;
595 
596  uval64 &= bitfield_mask;
597 
598  return uval64;
599 }
600 
601 int64_t DataExtractor::GetMaxS64Bitfield(offset_t *offset_ptr, size_t size,
602  uint32_t bitfield_bit_size,
603  uint32_t bitfield_bit_offset) const {
604  assert(size >= 1 && "GetMaxS64Bitfield size must be >= 1");
605  assert(size <= 8 && "GetMaxS64Bitfield size must be <= 8");
606  int64_t sval64 = GetMaxS64(offset_ptr, size);
607  if (bitfield_bit_size == 0)
608  return sval64;
609  int32_t lsbcount = bitfield_bit_offset;
611  lsbcount = size * 8 - bitfield_bit_offset - bitfield_bit_size;
612  if (lsbcount > 0)
613  sval64 >>= lsbcount;
614  uint64_t bitfield_mask = llvm::maskTrailingOnes<uint64_t>(bitfield_bit_size);
615  sval64 &= bitfield_mask;
616  // sign extend if needed
617  if (sval64 & ((static_cast<uint64_t>(1)) << (bitfield_bit_size - 1)))
618  sval64 |= ~bitfield_mask;
619  return sval64;
620 }
621 
622 float DataExtractor::GetFloat(offset_t *offset_ptr) const {
623  return Get<float>(offset_ptr, 0.0f);
624 }
625 
626 double DataExtractor::GetDouble(offset_t *offset_ptr) const {
627  return Get<double>(offset_ptr, 0.0);
628 }
629 
630 long double DataExtractor::GetLongDouble(offset_t *offset_ptr) const {
631  long double val = 0.0;
632 #if defined(__i386__) || defined(__amd64__) || defined(__x86_64__) || \
633  defined(_M_IX86) || defined(_M_IA64) || defined(_M_X64)
634  *offset_ptr += CopyByteOrderedData(*offset_ptr, 10, &val, sizeof(val),
636 #else
637  *offset_ptr += CopyByteOrderedData(*offset_ptr, sizeof(val), &val,
638  sizeof(val), endian::InlHostByteOrder());
639 #endif
640  return val;
641 }
642 
643 // Extract a single address from the data and update the offset pointed to by
644 // "offset_ptr". The size of the extracted address comes from the
645 // "this->m_addr_size" member variable and should be set correctly prior to
646 // extracting any address values.
647 //
648 // RETURNS the address that was extracted, or zero on failure.
649 uint64_t DataExtractor::GetAddress(offset_t *offset_ptr) const {
650  assert(m_addr_size >= 1 && m_addr_size <= 8);
651  return GetMaxU64(offset_ptr, m_addr_size);
652 }
653 
654 uint64_t DataExtractor::GetAddress_unchecked(offset_t *offset_ptr) const {
655  assert(m_addr_size >= 1 && m_addr_size <= 8);
656  return GetMaxU64_unchecked(offset_ptr, m_addr_size);
657 }
658 
660  ByteOrder dst_byte_order, void *dst) const {
661  const uint8_t *src = PeekData(offset, length);
662  if (src) {
663  if (dst_byte_order != GetByteOrder()) {
664  // Validate that only a word- or register-sized dst is byte swapped
665  assert(length == 1 || length == 2 || length == 4 || length == 8 ||
666  length == 10 || length == 16 || length == 32);
667 
668  for (uint32_t i = 0; i < length; ++i)
669  (static_cast<uint8_t *>(dst))[i] = src[length - i - 1];
670  } else
671  ::memcpy(dst, src, length);
672  return length;
673  }
674  return 0;
675 }
676 
677 // Extract data as it exists in target memory
679  void *dst) const {
680  const uint8_t *src = PeekData(offset, length);
681  if (src) {
682  ::memcpy(dst, src, length);
683  return length;
684  }
685  return 0;
686 }
687 
688 // Extract data and swap if needed when doing the copy
691  void *dst_void_ptr, offset_t dst_len,
692  ByteOrder dst_byte_order) const {
693  // Validate the source info
694  if (!ValidOffsetForDataOfSize(src_offset, src_len))
695  assert(ValidOffsetForDataOfSize(src_offset, src_len));
696  assert(src_len > 0);
698 
699  // Validate the destination info
700  assert(dst_void_ptr != nullptr);
701  assert(dst_len > 0);
702  assert(dst_byte_order == eByteOrderBig || dst_byte_order == eByteOrderLittle);
703 
704  // Validate that only a word- or register-sized dst is byte swapped
705  assert(dst_byte_order == m_byte_order || dst_len == 1 || dst_len == 2 ||
706  dst_len == 4 || dst_len == 8 || dst_len == 10 || dst_len == 16 ||
707  dst_len == 32);
708 
709  // Must have valid byte orders set in this object and for destination
710  if (!(dst_byte_order == eByteOrderBig ||
711  dst_byte_order == eByteOrderLittle) ||
713  return 0;
714 
715  uint8_t *dst = static_cast<uint8_t *>(dst_void_ptr);
716  const uint8_t *src = PeekData(src_offset, src_len);
717  if (src) {
718  if (dst_len >= src_len) {
719  // We are copying the entire value from src into dst. Calculate how many,
720  // if any, zeroes we need for the most significant bytes if "dst_len" is
721  // greater than "src_len"...
722  const size_t num_zeroes = dst_len - src_len;
723  if (dst_byte_order == eByteOrderBig) {
724  // Big endian, so we lead with zeroes...
725  if (num_zeroes > 0)
726  ::memset(dst, 0, num_zeroes);
727  // Then either copy or swap the rest
728  if (m_byte_order == eByteOrderBig) {
729  ::memcpy(dst + num_zeroes, src, src_len);
730  } else {
731  for (uint32_t i = 0; i < src_len; ++i)
732  dst[i + num_zeroes] = src[src_len - 1 - i];
733  }
734  } else {
735  // Little endian destination, so we lead the value bytes
736  if (m_byte_order == eByteOrderBig) {
737  for (uint32_t i = 0; i < src_len; ++i)
738  dst[i] = src[src_len - 1 - i];
739  } else {
740  ::memcpy(dst, src, src_len);
741  }
742  // And zero the rest...
743  if (num_zeroes > 0)
744  ::memset(dst + src_len, 0, num_zeroes);
745  }
746  return src_len;
747  } else {
748  // We are only copying some of the value from src into dst..
749 
750  if (dst_byte_order == eByteOrderBig) {
751  // Big endian dst
752  if (m_byte_order == eByteOrderBig) {
753  // Big endian dst, with big endian src
754  ::memcpy(dst, src + (src_len - dst_len), dst_len);
755  } else {
756  // Big endian dst, with little endian src
757  for (uint32_t i = 0; i < dst_len; ++i)
758  dst[i] = src[dst_len - 1 - i];
759  }
760  } else {
761  // Little endian dst
762  if (m_byte_order == eByteOrderBig) {
763  // Little endian dst, with big endian src
764  for (uint32_t i = 0; i < dst_len; ++i)
765  dst[i] = src[src_len - 1 - i];
766  } else {
767  // Little endian dst, with big endian src
768  ::memcpy(dst, src, dst_len);
769  }
770  }
771  return dst_len;
772  }
773  }
774  return 0;
775 }
776 
777 // Extracts a variable length NULL terminated C string from the data at the
778 // offset pointed to by "offset_ptr". The "offset_ptr" will be updated with
779 // the offset of the byte that follows the NULL terminator byte.
780 //
781 // If the offset pointed to by "offset_ptr" is out of bounds, or if "length" is
782 // non-zero and there aren't enough available bytes, nullptr will be returned
783 // and "offset_ptr" will not be updated.
784 const char *DataExtractor::GetCStr(offset_t *offset_ptr) const {
785  const char *start = reinterpret_cast<const char *>(PeekData(*offset_ptr, 1));
786  // Already at the end of the data.
787  if (!start)
788  return nullptr;
789 
790  const char *end = reinterpret_cast<const char *>(m_end);
791 
792  // Check all bytes for a null terminator that terminates a C string.
793  const char *terminator_or_end = std::find(start, end, '\0');
794 
795  // We didn't find a null terminator, so return nullptr to indicate that there
796  // is no valid C string at that offset.
797  if (terminator_or_end == end)
798  return nullptr;
799 
800  // Update offset_ptr for the caller to point to the data behind the
801  // terminator (which is 1 byte long).
802  *offset_ptr += (terminator_or_end - start + 1UL);
803  return start;
804 }
805 
806 // Extracts a NULL terminated C string from the fixed length field of length
807 // "len" at the offset pointed to by "offset_ptr". The "offset_ptr" will be
808 // updated with the offset of the byte that follows the fixed length field.
809 //
810 // If the offset pointed to by "offset_ptr" is out of bounds, or if the offset
811 // plus the length of the field is out of bounds, or if the field does not
812 // contain a NULL terminator byte, nullptr will be returned and "offset_ptr"
813 // will not be updated.
814 const char *DataExtractor::GetCStr(offset_t *offset_ptr, offset_t len) const {
815  const char *cstr = reinterpret_cast<const char *>(PeekData(*offset_ptr, len));
816  if (cstr != nullptr) {
817  if (memchr(cstr, '\0', len) == nullptr) {
818  return nullptr;
819  }
820  *offset_ptr += len;
821  return cstr;
822  }
823  return nullptr;
824 }
825 
826 // Peeks at a string in the contained data. No verification is done to make
827 // sure the entire string lies within the bounds of this object's data, only
828 // "offset" is verified to be a valid offset.
829 //
830 // Returns a valid C string pointer if "offset" is a valid offset in this
831 // object's data, else nullptr is returned.
832 const char *DataExtractor::PeekCStr(offset_t offset) const {
833  return reinterpret_cast<const char *>(PeekData(offset, 1));
834 }
835 
836 // Extracts an unsigned LEB128 number from this object's data starting at the
837 // offset pointed to by "offset_ptr". The offset pointed to by "offset_ptr"
838 // will be updated with the offset of the byte following the last extracted
839 // byte.
840 //
841 // Returned the extracted integer value.
842 uint64_t DataExtractor::GetULEB128(offset_t *offset_ptr) const {
843  const uint8_t *src = PeekData(*offset_ptr, 1);
844  if (src == nullptr)
845  return 0;
846 
847  unsigned byte_count = 0;
848  uint64_t result = llvm::decodeULEB128(src, &byte_count, m_end);
849  *offset_ptr += byte_count;
850  return result;
851 }
852 
853 // Extracts an signed LEB128 number from this object's data starting at the
854 // offset pointed to by "offset_ptr". The offset pointed to by "offset_ptr"
855 // will be updated with the offset of the byte following the last extracted
856 // byte.
857 //
858 // Returned the extracted integer value.
859 int64_t DataExtractor::GetSLEB128(offset_t *offset_ptr) const {
860  const uint8_t *src = PeekData(*offset_ptr, 1);
861  if (src == nullptr)
862  return 0;
863 
864  unsigned byte_count = 0;
865  int64_t result = llvm::decodeSLEB128(src, &byte_count, m_end);
866  *offset_ptr += byte_count;
867  return result;
868 }
869 
870 // Skips a ULEB128 number (signed or unsigned) from this object's data starting
871 // at the offset pointed to by "offset_ptr". The offset pointed to by
872 // "offset_ptr" will be updated with the offset of the byte following the last
873 // extracted byte.
874 //
875 // Returns the number of bytes consumed during the extraction.
877  uint32_t bytes_consumed = 0;
878  const uint8_t *src = PeekData(*offset_ptr, 1);
879  if (src == nullptr)
880  return 0;
881 
882  const uint8_t *end = m_end;
883 
884  if (src < end) {
885  const uint8_t *src_pos = src;
886  while ((src_pos < end) && (*src_pos++ & 0x80))
887  ++bytes_consumed;
888  *offset_ptr += src_pos - src;
889  }
890  return bytes_consumed;
891 }
892 
893 // Dumps bytes from this object's data to the stream "s" starting
894 // "start_offset" bytes into this data, and ending with the byte before
895 // "end_offset". "base_addr" will be added to the offset into the dumped data
896 // when showing the offset into the data in the output information.
897 // "num_per_line" objects of type "type" will be dumped with the option to
898 // override the format for each object with "type_format". "type_format" is a
899 // printf style formatting string. If "type_format" is nullptr, then an
900 // appropriate format string will be used for the supplied "type". If the
901 // stream "s" is nullptr, then the output will be send to Log().
903  offset_t length, uint64_t base_addr,
904  uint32_t num_per_line,
905  DataExtractor::Type type) const {
906  if (log == nullptr)
907  return start_offset;
908 
909  offset_t offset;
910  offset_t end_offset;
911  uint32_t count;
912  StreamString sstr;
913  for (offset = start_offset, end_offset = offset + length, count = 0;
914  ValidOffset(offset) && offset < end_offset; ++count) {
915  if ((count % num_per_line) == 0) {
916  // Print out any previous string
917  if (sstr.GetSize() > 0) {
918  log->PutString(sstr.GetString());
919  sstr.Clear();
920  }
921  // Reset string offset and fill the current line string with address:
922  if (base_addr != LLDB_INVALID_ADDRESS)
923  sstr.Printf("0x%8.8" PRIx64 ":",
924  static_cast<uint64_t>(base_addr + (offset - start_offset)));
925  }
926 
927  switch (type) {
928  case TypeUInt8:
929  sstr.Printf(" %2.2x", GetU8(&offset));
930  break;
931  case TypeChar: {
932  char ch = GetU8(&offset);
933  sstr.Printf(" %c", llvm::isPrint(ch) ? ch : ' ');
934  } break;
935  case TypeUInt16:
936  sstr.Printf(" %4.4x", GetU16(&offset));
937  break;
938  case TypeUInt32:
939  sstr.Printf(" %8.8x", GetU32(&offset));
940  break;
941  case TypeUInt64:
942  sstr.Printf(" %16.16" PRIx64, GetU64(&offset));
943  break;
944  case TypePointer:
945  sstr.Printf(" 0x%" PRIx64, GetAddress(&offset));
946  break;
947  case TypeULEB128:
948  sstr.Printf(" 0x%" PRIx64, GetULEB128(&offset));
949  break;
950  case TypeSLEB128:
951  sstr.Printf(" %" PRId64, GetSLEB128(&offset));
952  break;
953  }
954  }
955 
956  if (!sstr.Empty())
957  log->PutString(sstr.GetString());
958 
959  return offset; // Return the offset at which we ended up
960 }
961 
962 size_t DataExtractor::Copy(DataExtractor &dest_data) const {
963  if (m_data_sp) {
964  // we can pass along the SP to the data
965  dest_data.SetData(m_data_sp);
966  } else {
967  const uint8_t *base_ptr = m_start;
968  size_t data_size = GetByteSize();
969  dest_data.SetData(DataBufferSP(new DataBufferHeap(base_ptr, data_size)));
970  }
971  return GetByteSize();
972 }
973 
975  if (rhs.GetByteOrder() != GetByteOrder())
976  return false;
977 
978  if (rhs.GetByteSize() == 0)
979  return true;
980 
981  if (GetByteSize() == 0)
982  return (rhs.Copy(*this) > 0);
983 
984  size_t bytes = GetByteSize() + rhs.GetByteSize();
985 
986  DataBufferHeap *buffer_heap_ptr = nullptr;
987  DataBufferSP buffer_sp(buffer_heap_ptr = new DataBufferHeap(bytes, 0));
988 
989  if (!buffer_sp || buffer_heap_ptr == nullptr)
990  return false;
991 
992  uint8_t *bytes_ptr = buffer_heap_ptr->GetBytes();
993 
994  memcpy(bytes_ptr, GetDataStart(), GetByteSize());
995  memcpy(bytes_ptr + GetByteSize(), rhs.GetDataStart(), rhs.GetByteSize());
996 
997  SetData(buffer_sp);
998 
999  return true;
1000 }
1001 
1002 bool DataExtractor::Append(void *buf, offset_t length) {
1003  if (buf == nullptr)
1004  return false;
1005 
1006  if (length == 0)
1007  return true;
1008 
1009  size_t bytes = GetByteSize() + length;
1010 
1011  DataBufferHeap *buffer_heap_ptr = nullptr;
1012  DataBufferSP buffer_sp(buffer_heap_ptr = new DataBufferHeap(bytes, 0));
1013 
1014  if (!buffer_sp || buffer_heap_ptr == nullptr)
1015  return false;
1016 
1017  uint8_t *bytes_ptr = buffer_heap_ptr->GetBytes();
1018 
1019  if (GetByteSize() > 0)
1020  memcpy(bytes_ptr, GetDataStart(), GetByteSize());
1021 
1022  memcpy(bytes_ptr + GetByteSize(), buf, length);
1023 
1024  SetData(buffer_sp);
1025 
1026  return true;
1027 }
1028 
1030  uint64_t max_data) {
1031  if (max_data == 0)
1032  max_data = GetByteSize();
1033  else
1034  max_data = std::min(max_data, GetByteSize());
1035 
1036  llvm::MD5 md5;
1037 
1038  const llvm::ArrayRef<uint8_t> data(GetDataStart(), max_data);
1039  md5.update(data);
1040 
1041  llvm::MD5::MD5Result result;
1042  md5.final(result);
1043 
1044  dest.clear();
1045  dest.append(result.begin(), result.end());
1046 }
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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:902
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Extract a unsigned LEB128 value from *offset_ptr.
Definition: DataExtractor.cpp:842
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Definition: Log.cpp:135
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Extract an address from *offset_ptr.
Definition: DataExtractor.cpp:649
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The address size to use when extracting addresses.
Definition: DataExtractor.h:1016
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@ TypeUInt16
Format output as unsigned 16 bit integers.
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Definition: DataExtractor.cpp:83
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Definition: DataExtractor.cpp:108
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Definition: DataExtractor.h:58
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Definition: StreamString.cpp:51
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Definition: DataExtractor.cpp:832
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Definition: StreamString.cpp:38
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Extract a signed LEB128 value from *offset_ptr.
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Definition: DataExtractor.h:48
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Get the current byte order value.
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Definition: StreamString.h:23
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Definition: StreamString.cpp:36
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Definition: DataExtractor.cpp:69
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Extract a uint32_t value from *offset_ptr.
Definition: DataExtractor.cpp:425
LLDB_INVALID_ADDRESS
#define LLDB_INVALID_ADDRESS
Definition: lldb-defines.h:74
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:573
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:678
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:347
lldb_private::DataExtractor::GetLongDouble
long double GetLongDouble(lldb::offset_t *offset_ptr) const
Definition: DataExtractor.cpp:630
lldb_private::DataExtractor::GetCStr
const char * GetCStr(lldb::offset_t *offset_ptr) const
Extract a C string from *offset_ptr.
Definition: DataExtractor.cpp:784
lldb_private::DataExtractor::TypeUInt32
@ TypeUInt32
Format output as unsigned 32 bit integers.
Definition: DataExtractor.h:56
lldb::eByteOrderBig
@ eByteOrderBig
Definition: lldb-enumerations.h:141
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:690
lldb_private::DataExtractor::Clear
void Clear()
Clears the object state.
Definition: DataExtractor.cpp:192
lldb_private::DataExtractor::GetU64_unchecked
uint64_t GetU64_unchecked(lldb::offset_t *offset_ptr) const
Definition: DataExtractor.cpp:380
Stream.h
lldb_private::Log
Definition: Log.h:115
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:1029
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:143
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:177
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:370
lldb::ByteOrder
ByteOrder
Byte ordering definitions.
Definition: lldb-enumerations.h:139
lldb_private::DataExtractor::TypeULEB128
@ TypeULEB128
Format output as ULEB128 numbers.
Definition: DataExtractor.h:59