Bug Summary

File:build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/lldb/source/Plugins/SymbolFile/DWARF/DWARFFormValue.cpp
Warning:line 249, column 5
Value stored to 'ref_addr_size' is never read

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name DWARFFormValue.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/build-llvm/tools/clang/stage2-bins -resource-dir /usr/lib/llvm-15/lib/clang/15.0.0 -isystem /usr/include/libxml2 -D HAVE_ROUND -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I tools/lldb/source/Plugins/SymbolFile/DWARF -I /build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/lldb/source/Plugins/SymbolFile/DWARF -I /build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/lldb/include -I tools/lldb/include -I include -I /build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/llvm/include -I /usr/include/python3.9 -I /build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/clang/include -I tools/lldb/../clang/include -I /build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/lldb/source -I tools/lldb/source -D _FORTIFY_SOURCE=2 -D NDEBUG -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/backward -internal-isystem /usr/lib/llvm-15/lib/clang/15.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fmacro-prefix-map=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/build-llvm/tools/clang/stage2-bins=build-llvm/tools/clang/stage2-bins -fmacro-prefix-map=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/= -fcoverage-prefix-map=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/build-llvm/tools/clang/stage2-bins=build-llvm/tools/clang/stage2-bins -fcoverage-prefix-map=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/= -O3 -Wno-unused-command-line-argument -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wno-comment -Wno-deprecated-declarations -Wno-unknown-pragmas -Wno-strict-aliasing -Wno-stringop-truncation -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/build-llvm/tools/clang/stage2-bins -fdebug-prefix-map=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/build-llvm/tools/clang/stage2-bins=build-llvm/tools/clang/stage2-bins -fdebug-prefix-map=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/= -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fcolor-diagnostics -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2022-04-20-140412-16051-1 -x c++ /build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/lldb/source/Plugins/SymbolFile/DWARF/DWARFFormValue.cpp
1//===-- DWARFFormValue.cpp ------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include <cassert>
10
11#include "lldb/Core/Module.h"
12#include "lldb/Core/dwarf.h"
13#include "lldb/Symbol/ObjectFile.h"
14#include "lldb/Utility/Stream.h"
15
16#include "DWARFDebugInfo.h"
17#include "DWARFFormValue.h"
18#include "DWARFUnit.h"
19
20class DWARFUnit;
21
22using namespace lldb_private;
23using namespace lldb_private::dwarf;
24
25void DWARFFormValue::Clear() {
26 m_unit = nullptr;
27 m_form = 0;
28 m_value = ValueTypeTag();
29}
30
31bool DWARFFormValue::ExtractValue(const DWARFDataExtractor &data,
32 lldb::offset_t *offset_ptr) {
33 if (m_form == DW_FORM_implicit_const)
34 return true;
35
36 bool indirect = false;
37 bool is_block = false;
38 m_value.data = nullptr;
39 uint8_t ref_addr_size;
40 // Read the value for the form into value and follow and DW_FORM_indirect
41 // instances we run into
42 do {
43 indirect = false;
44 switch (m_form) {
45 case DW_FORM_addr:
46 assert(m_unit)(static_cast <bool> (m_unit) ? void (0) : __assert_fail
("m_unit", "lldb/source/Plugins/SymbolFile/DWARF/DWARFFormValue.cpp"
, 46, __extension__ __PRETTY_FUNCTION__));
47 m_value.value.uval =
48 data.GetMaxU64(offset_ptr, DWARFUnit::GetAddressByteSize(m_unit));
49 break;
50 case DW_FORM_block1:
51 m_value.value.uval = data.GetU8(offset_ptr);
52 is_block = true;
53 break;
54 case DW_FORM_block2:
55 m_value.value.uval = data.GetU16(offset_ptr);
56 is_block = true;
57 break;
58 case DW_FORM_block4:
59 m_value.value.uval = data.GetU32(offset_ptr);
60 is_block = true;
61 break;
62 case DW_FORM_data16:
63 m_value.value.uval = 16;
64 is_block = true;
65 break;
66 case DW_FORM_exprloc:
67 case DW_FORM_block:
68 m_value.value.uval = data.GetULEB128(offset_ptr);
69 is_block = true;
70 break;
71 case DW_FORM_string:
72 m_value.value.cstr = data.GetCStr(offset_ptr);
73 break;
74 case DW_FORM_sdata:
75 m_value.value.sval = data.GetSLEB128(offset_ptr);
76 break;
77 case DW_FORM_strp:
78 case DW_FORM_line_strp:
79 case DW_FORM_sec_offset:
80 m_value.value.uval = data.GetMaxU64(offset_ptr, 4);
81 break;
82 case DW_FORM_addrx1:
83 case DW_FORM_strx1:
84 case DW_FORM_ref1:
85 case DW_FORM_data1:
86 case DW_FORM_flag:
87 m_value.value.uval = data.GetU8(offset_ptr);
88 break;
89 case DW_FORM_addrx2:
90 case DW_FORM_strx2:
91 case DW_FORM_ref2:
92 case DW_FORM_data2:
93 m_value.value.uval = data.GetU16(offset_ptr);
94 break;
95 case DW_FORM_addrx3:
96 case DW_FORM_strx3:
97 m_value.value.uval = data.GetMaxU64(offset_ptr, 3);
98 break;
99 case DW_FORM_addrx4:
100 case DW_FORM_strx4:
101 case DW_FORM_ref4:
102 case DW_FORM_data4:
103 m_value.value.uval = data.GetU32(offset_ptr);
104 break;
105 case DW_FORM_data8:
106 case DW_FORM_ref8:
107 case DW_FORM_ref_sig8:
108 m_value.value.uval = data.GetU64(offset_ptr);
109 break;
110 case DW_FORM_addrx:
111 case DW_FORM_loclistx:
112 case DW_FORM_rnglistx:
113 case DW_FORM_strx:
114 case DW_FORM_udata:
115 case DW_FORM_ref_udata:
116 case DW_FORM_GNU_str_index:
117 case DW_FORM_GNU_addr_index:
118 m_value.value.uval = data.GetULEB128(offset_ptr);
119 break;
120 case DW_FORM_ref_addr:
121 assert(m_unit)(static_cast <bool> (m_unit) ? void (0) : __assert_fail
("m_unit", "lldb/source/Plugins/SymbolFile/DWARF/DWARFFormValue.cpp"
, 121, __extension__ __PRETTY_FUNCTION__));
122 if (m_unit->GetVersion() <= 2)
123 ref_addr_size = m_unit->GetAddressByteSize();
124 else
125 ref_addr_size = 4;
126 m_value.value.uval = data.GetMaxU64(offset_ptr, ref_addr_size);
127 break;
128 case DW_FORM_indirect:
129 m_form = data.GetULEB128(offset_ptr);
130 indirect = true;
131 break;
132 case DW_FORM_flag_present:
133 m_value.value.uval = 1;
134 break;
135 default:
136 return false;
137 }
138 } while (indirect);
139
140 if (is_block) {
141 m_value.data = data.PeekData(*offset_ptr, m_value.value.uval);
142 if (m_value.data != nullptr) {
143 *offset_ptr += m_value.value.uval;
144 }
145 }
146
147 return true;
148}
149
150struct FormSize {
151 uint8_t valid:1, size:7;
152};
153static FormSize g_form_sizes[] = {
154 {0, 0}, // 0x00 unused
155 {0, 0}, // 0x01 DW_FORM_addr
156 {0, 0}, // 0x02 unused
157 {0, 0}, // 0x03 DW_FORM_block2
158 {0, 0}, // 0x04 DW_FORM_block4
159 {1, 2}, // 0x05 DW_FORM_data2
160 {1, 4}, // 0x06 DW_FORM_data4
161 {1, 8}, // 0x07 DW_FORM_data8
162 {0, 0}, // 0x08 DW_FORM_string
163 {0, 0}, // 0x09 DW_FORM_block
164 {0, 0}, // 0x0a DW_FORM_block1
165 {1, 1}, // 0x0b DW_FORM_data1
166 {1, 1}, // 0x0c DW_FORM_flag
167 {0, 0}, // 0x0d DW_FORM_sdata
168 {1, 4}, // 0x0e DW_FORM_strp
169 {0, 0}, // 0x0f DW_FORM_udata
170 {0, 0}, // 0x10 DW_FORM_ref_addr (addr size for DWARF2 and earlier, 4 bytes
171 // for DWARF32, 8 bytes for DWARF32 in DWARF 3 and later
172 {1, 1}, // 0x11 DW_FORM_ref1
173 {1, 2}, // 0x12 DW_FORM_ref2
174 {1, 4}, // 0x13 DW_FORM_ref4
175 {1, 8}, // 0x14 DW_FORM_ref8
176 {0, 0}, // 0x15 DW_FORM_ref_udata
177 {0, 0}, // 0x16 DW_FORM_indirect
178 {1, 4}, // 0x17 DW_FORM_sec_offset
179 {0, 0}, // 0x18 DW_FORM_exprloc
180 {1, 0}, // 0x19 DW_FORM_flag_present
181 {0, 0}, // 0x1a DW_FORM_strx (ULEB128)
182 {0, 0}, // 0x1b DW_FORM_addrx (ULEB128)
183 {1, 4}, // 0x1c DW_FORM_ref_sup4
184 {0, 0}, // 0x1d DW_FORM_strp_sup (4 bytes for DWARF32, 8 bytes for DWARF64)
185 {1, 16}, // 0x1e DW_FORM_data16
186 {1, 4}, // 0x1f DW_FORM_line_strp
187 {1, 8}, // 0x20 DW_FORM_ref_sig8
188};
189
190llvm::Optional<uint8_t>
191DWARFFormValue::GetFixedSize(dw_form_t form, const DWARFUnit *u) {
192 if (form <= DW_FORM_ref_sig8 && g_form_sizes[form].valid)
193 return g_form_sizes[form].size;
194 if (form == DW_FORM_addr && u)
195 return u->GetAddressByteSize();
196 return llvm::None;
197}
198
199llvm::Optional<uint8_t> DWARFFormValue::GetFixedSize() const {
200 return GetFixedSize(m_form, m_unit);
201}
202
203bool DWARFFormValue::SkipValue(const DWARFDataExtractor &debug_info_data,
204 lldb::offset_t *offset_ptr) const {
205 return DWARFFormValue::SkipValue(m_form, debug_info_data, offset_ptr, m_unit);
206}
207
208bool DWARFFormValue::SkipValue(dw_form_t form,
209 const DWARFDataExtractor &debug_info_data,
210 lldb::offset_t *offset_ptr,
211 const DWARFUnit *unit) {
212 uint8_t ref_addr_size;
213 switch (form) {
214 // Blocks if inlined data that have a length field and the data bytes inlined
215 // in the .debug_info
216 case DW_FORM_exprloc:
217 case DW_FORM_block: {
218 dw_uleb128_t size = debug_info_data.GetULEB128(offset_ptr);
219 *offset_ptr += size;
220 }
221 return true;
222 case DW_FORM_block1: {
223 dw_uleb128_t size = debug_info_data.GetU8(offset_ptr);
224 *offset_ptr += size;
225 }
226 return true;
227 case DW_FORM_block2: {
228 dw_uleb128_t size = debug_info_data.GetU16(offset_ptr);
229 *offset_ptr += size;
230 }
231 return true;
232 case DW_FORM_block4: {
233 dw_uleb128_t size = debug_info_data.GetU32(offset_ptr);
234 *offset_ptr += size;
235 }
236 return true;
237
238 // Inlined NULL terminated C-strings
239 case DW_FORM_string:
240 debug_info_data.GetCStr(offset_ptr);
241 return true;
242
243 // Compile unit address sized values
244 case DW_FORM_addr:
245 *offset_ptr += DWARFUnit::GetAddressByteSize(unit);
246 return true;
247
248 case DW_FORM_ref_addr:
249 ref_addr_size = 4;
Value stored to 'ref_addr_size' is never read
250 assert(unit)(static_cast <bool> (unit) ? void (0) : __assert_fail (
"unit", "lldb/source/Plugins/SymbolFile/DWARF/DWARFFormValue.cpp"
, 250, __extension__ __PRETTY_FUNCTION__)); // Unit must be valid for DW_FORM_ref_addr objects or we will
251 // get this wrong
252 if (unit->GetVersion() <= 2)
253 ref_addr_size = unit->GetAddressByteSize();
254 else
255 ref_addr_size = 4;
256 *offset_ptr += ref_addr_size;
257 return true;
258
259 // 0 bytes values (implied from DW_FORM)
260 case DW_FORM_flag_present:
261 case DW_FORM_implicit_const:
262 return true;
263
264 // 1 byte values
265 case DW_FORM_addrx1:
266 case DW_FORM_data1:
267 case DW_FORM_flag:
268 case DW_FORM_ref1:
269 case DW_FORM_strx1:
270 *offset_ptr += 1;
271 return true;
272
273 // 2 byte values
274 case DW_FORM_addrx2:
275 case DW_FORM_data2:
276 case DW_FORM_ref2:
277 case DW_FORM_strx2:
278 *offset_ptr += 2;
279 return true;
280
281 // 3 byte values
282 case DW_FORM_addrx3:
283 case DW_FORM_strx3:
284 *offset_ptr += 3;
285 return true;
286
287 // 32 bit for DWARF 32, 64 for DWARF 64
288 case DW_FORM_sec_offset:
289 case DW_FORM_strp:
290 case DW_FORM_line_strp:
291 *offset_ptr += 4;
292 return true;
293
294 // 4 byte values
295 case DW_FORM_addrx4:
296 case DW_FORM_data4:
297 case DW_FORM_ref4:
298 case DW_FORM_strx4:
299 *offset_ptr += 4;
300 return true;
301
302 // 8 byte values
303 case DW_FORM_data8:
304 case DW_FORM_ref8:
305 case DW_FORM_ref_sig8:
306 *offset_ptr += 8;
307 return true;
308
309 // signed or unsigned LEB 128 values
310 case DW_FORM_addrx:
311 case DW_FORM_loclistx:
312 case DW_FORM_rnglistx:
313 case DW_FORM_sdata:
314 case DW_FORM_udata:
315 case DW_FORM_ref_udata:
316 case DW_FORM_GNU_addr_index:
317 case DW_FORM_GNU_str_index:
318 case DW_FORM_strx:
319 debug_info_data.Skip_LEB128(offset_ptr);
320 return true;
321
322 case DW_FORM_indirect: {
323 dw_form_t indirect_form = debug_info_data.GetULEB128(offset_ptr);
324 return DWARFFormValue::SkipValue(indirect_form, debug_info_data, offset_ptr,
325 unit);
326 }
327
328 default:
329 break;
330 }
331 return false;
332}
333
334void DWARFFormValue::Dump(Stream &s) const {
335 uint64_t uvalue = Unsigned();
336 bool unit_relative_offset = false;
337
338 switch (m_form) {
339 case DW_FORM_addr:
340 DumpAddress(s.AsRawOstream(), uvalue, sizeof(uint64_t));
341 break;
342 case DW_FORM_flag:
343 case DW_FORM_data1:
344 s.PutHex8(uvalue);
345 break;
346 case DW_FORM_data2:
347 s.PutHex16(uvalue);
348 break;
349 case DW_FORM_sec_offset:
350 case DW_FORM_data4:
351 s.PutHex32(uvalue);
352 break;
353 case DW_FORM_ref_sig8:
354 case DW_FORM_data8:
355 s.PutHex64(uvalue);
356 break;
357 case DW_FORM_string:
358 s.QuotedCString(AsCString());
359 break;
360 case DW_FORM_exprloc:
361 case DW_FORM_block:
362 case DW_FORM_block1:
363 case DW_FORM_block2:
364 case DW_FORM_block4:
365 if (uvalue > 0) {
366 switch (m_form) {
367 case DW_FORM_exprloc:
368 case DW_FORM_block:
369 s.Printf("<0x%" PRIx64"l" "x" "> ", uvalue);
370 break;
371 case DW_FORM_block1:
372 s.Printf("<0x%2.2x> ", (uint8_t)uvalue);
373 break;
374 case DW_FORM_block2:
375 s.Printf("<0x%4.4x> ", (uint16_t)uvalue);
376 break;
377 case DW_FORM_block4:
378 s.Printf("<0x%8.8x> ", (uint32_t)uvalue);
379 break;
380 default:
381 break;
382 }
383
384 const uint8_t *data_ptr = m_value.data;
385 if (data_ptr) {
386 const uint8_t *end_data_ptr =
387 data_ptr + uvalue; // uvalue contains size of block
388 while (data_ptr < end_data_ptr) {
389 s.Printf("%2.2x ", *data_ptr);
390 ++data_ptr;
391 }
392 } else
393 s.PutCString("NULL");
394 }
395 break;
396
397 case DW_FORM_sdata:
398 s.PutSLEB128(uvalue);
399 break;
400 case DW_FORM_udata:
401 s.PutULEB128(uvalue);
402 break;
403 case DW_FORM_strp:
404 case DW_FORM_line_strp: {
405 const char *dbg_str = AsCString();
406 if (dbg_str) {
407 s.QuotedCString(dbg_str);
408 } else {
409 s.PutHex32(uvalue);
410 }
411 } break;
412
413 case DW_FORM_ref_addr: {
414 assert(m_unit)(static_cast <bool> (m_unit) ? void (0) : __assert_fail
("m_unit", "lldb/source/Plugins/SymbolFile/DWARF/DWARFFormValue.cpp"
, 414, __extension__ __PRETTY_FUNCTION__)); // Unit must be valid for DW_FORM_ref_addr objects or we
415 // will get this wrong
416 if (m_unit->GetVersion() <= 2)
417 DumpAddress(s.AsRawOstream(), uvalue, sizeof(uint64_t) * 2);
418 else
419 DumpAddress(s.AsRawOstream(), uvalue,
420 4 * 2); // 4 for DWARF32, 8 for DWARF64, but we don't
421 // support DWARF64 yet
422 break;
423 }
424 case DW_FORM_ref1:
425 unit_relative_offset = true;
426 break;
427 case DW_FORM_ref2:
428 unit_relative_offset = true;
429 break;
430 case DW_FORM_ref4:
431 unit_relative_offset = true;
432 break;
433 case DW_FORM_ref8:
434 unit_relative_offset = true;
435 break;
436 case DW_FORM_ref_udata:
437 unit_relative_offset = true;
438 break;
439
440 // All DW_FORM_indirect attributes should be resolved prior to calling this
441 // function
442 case DW_FORM_indirect:
443 s.PutCString("DW_FORM_indirect");
444 break;
445 case DW_FORM_flag_present:
446 break;
447 default:
448 s.Printf("DW_FORM(0x%4.4x)", m_form);
449 break;
450 }
451
452 if (unit_relative_offset) {
453 assert(m_unit)(static_cast <bool> (m_unit) ? void (0) : __assert_fail
("m_unit", "lldb/source/Plugins/SymbolFile/DWARF/DWARFFormValue.cpp"
, 453, __extension__ __PRETTY_FUNCTION__)); // Unit must be valid for DW_FORM_ref forms that are compile
454 // unit relative or we will get this wrong
455 s.Printf("{0x%8.8" PRIx64"l" "x" "}", uvalue + m_unit->GetOffset());
456 }
457}
458
459const char *DWARFFormValue::AsCString() const {
460 DWARFContext &context = m_unit->GetSymbolFileDWARF().GetDWARFContext();
461
462 if (m_form == DW_FORM_string)
463 return m_value.value.cstr;
464 if (m_form == DW_FORM_strp)
465 return context.getOrLoadStrData().PeekCStr(m_value.value.uval);
466
467 if (m_form == DW_FORM_GNU_str_index || m_form == DW_FORM_strx ||
468 m_form == DW_FORM_strx1 || m_form == DW_FORM_strx2 ||
469 m_form == DW_FORM_strx3 || m_form == DW_FORM_strx4) {
470
471 llvm::Optional<uint64_t> offset =
472 m_unit->GetStringOffsetSectionItem(m_value.value.uval);
473 if (!offset)
474 return nullptr;
475 return context.getOrLoadStrData().PeekCStr(*offset);
476 }
477
478 if (m_form == DW_FORM_line_strp)
479 return context.getOrLoadLineStrData().PeekCStr(m_value.value.uval);
480
481 return nullptr;
482}
483
484dw_addr_t DWARFFormValue::Address() const {
485 SymbolFileDWARF &symbol_file = m_unit->GetSymbolFileDWARF();
486
487 if (m_form == DW_FORM_addr)
488 return Unsigned();
489
490 assert(m_unit)(static_cast <bool> (m_unit) ? void (0) : __assert_fail
("m_unit", "lldb/source/Plugins/SymbolFile/DWARF/DWARFFormValue.cpp"
, 490, __extension__ __PRETTY_FUNCTION__));
491 assert(m_form == DW_FORM_GNU_addr_index || m_form == DW_FORM_addrx ||(static_cast <bool> (m_form == DW_FORM_GNU_addr_index ||
m_form == DW_FORM_addrx || m_form == DW_FORM_addrx1 || m_form
== DW_FORM_addrx2 || m_form == DW_FORM_addrx3 || m_form == DW_FORM_addrx4
) ? void (0) : __assert_fail ("m_form == DW_FORM_GNU_addr_index || m_form == DW_FORM_addrx || m_form == DW_FORM_addrx1 || m_form == DW_FORM_addrx2 || m_form == DW_FORM_addrx3 || m_form == DW_FORM_addrx4"
, "lldb/source/Plugins/SymbolFile/DWARF/DWARFFormValue.cpp", 493
, __extension__ __PRETTY_FUNCTION__))
492 m_form == DW_FORM_addrx1 || m_form == DW_FORM_addrx2 ||(static_cast <bool> (m_form == DW_FORM_GNU_addr_index ||
m_form == DW_FORM_addrx || m_form == DW_FORM_addrx1 || m_form
== DW_FORM_addrx2 || m_form == DW_FORM_addrx3 || m_form == DW_FORM_addrx4
) ? void (0) : __assert_fail ("m_form == DW_FORM_GNU_addr_index || m_form == DW_FORM_addrx || m_form == DW_FORM_addrx1 || m_form == DW_FORM_addrx2 || m_form == DW_FORM_addrx3 || m_form == DW_FORM_addrx4"
, "lldb/source/Plugins/SymbolFile/DWARF/DWARFFormValue.cpp", 493
, __extension__ __PRETTY_FUNCTION__))
493 m_form == DW_FORM_addrx3 || m_form == DW_FORM_addrx4)(static_cast <bool> (m_form == DW_FORM_GNU_addr_index ||
m_form == DW_FORM_addrx || m_form == DW_FORM_addrx1 || m_form
== DW_FORM_addrx2 || m_form == DW_FORM_addrx3 || m_form == DW_FORM_addrx4
) ? void (0) : __assert_fail ("m_form == DW_FORM_GNU_addr_index || m_form == DW_FORM_addrx || m_form == DW_FORM_addrx1 || m_form == DW_FORM_addrx2 || m_form == DW_FORM_addrx3 || m_form == DW_FORM_addrx4"
, "lldb/source/Plugins/SymbolFile/DWARF/DWARFFormValue.cpp", 493
, __extension__ __PRETTY_FUNCTION__));
494
495 uint32_t index_size = m_unit->GetAddressByteSize();
496 dw_offset_t addr_base = m_unit->GetAddrBase();
497 lldb::offset_t offset = addr_base + m_value.value.uval * index_size;
498 return symbol_file.GetDWARFContext().getOrLoadAddrData().GetMaxU64(
499 &offset, index_size);
500}
501
502DWARFDIE DWARFFormValue::Reference() const {
503 uint64_t value = m_value.value.uval;
504 switch (m_form) {
505 case DW_FORM_ref1:
506 case DW_FORM_ref2:
507 case DW_FORM_ref4:
508 case DW_FORM_ref8:
509 case DW_FORM_ref_udata:
510 assert(m_unit)(static_cast <bool> (m_unit) ? void (0) : __assert_fail
("m_unit", "lldb/source/Plugins/SymbolFile/DWARF/DWARFFormValue.cpp"
, 510, __extension__ __PRETTY_FUNCTION__)); // Unit must be valid for DW_FORM_ref forms that are compile
511 // unit relative or we will get this wrong
512 value += m_unit->GetOffset();
513 if (!m_unit->ContainsDIEOffset(value)) {
514 m_unit->GetSymbolFileDWARF().GetObjectFile()->GetModule()->ReportError(
515 "DW_FORM_ref* DIE reference 0x%" PRIx64"l" "x" " is outside of its CU",
516 value);
517 return {};
518 }
519 return const_cast<DWARFUnit *>(m_unit)->GetDIE(value);
520
521 case DW_FORM_ref_addr: {
522 DWARFUnit *ref_cu =
523 m_unit->GetSymbolFileDWARF().DebugInfo().GetUnitContainingDIEOffset(
524 DIERef::Section::DebugInfo, value);
525 if (!ref_cu) {
526 m_unit->GetSymbolFileDWARF().GetObjectFile()->GetModule()->ReportError(
527 "DW_FORM_ref_addr DIE reference 0x%" PRIx64"l" "x" " has no matching CU",
528 value);
529 return {};
530 }
531 return ref_cu->GetDIE(value);
532 }
533
534 case DW_FORM_ref_sig8: {
535 DWARFTypeUnit *tu =
536 m_unit->GetSymbolFileDWARF().DebugInfo().GetTypeUnitForHash(value);
537 if (!tu)
538 return {};
539 return tu->GetDIE(tu->GetTypeOffset());
540 }
541
542 default:
543 return {};
544 }
545}
546
547uint64_t DWARFFormValue::Reference(dw_offset_t base_offset) const {
548 uint64_t value = m_value.value.uval;
549 switch (m_form) {
550 case DW_FORM_ref1:
551 case DW_FORM_ref2:
552 case DW_FORM_ref4:
553 case DW_FORM_ref8:
554 case DW_FORM_ref_udata:
555 return value + base_offset;
556
557 case DW_FORM_ref_addr:
558 case DW_FORM_ref_sig8:
559 case DW_FORM_GNU_ref_alt:
560 return value;
561
562 default:
563 return DW_INVALID_OFFSET(~(dw_offset_t)0);
564 }
565}
566
567const uint8_t *DWARFFormValue::BlockData() const { return m_value.data; }
568
569bool DWARFFormValue::IsBlockForm(const dw_form_t form) {
570 switch (form) {
571 case DW_FORM_exprloc:
572 case DW_FORM_block:
573 case DW_FORM_block1:
574 case DW_FORM_block2:
575 case DW_FORM_block4:
576 return true;
577 }
578 return false;
579}
580
581bool DWARFFormValue::IsDataForm(const dw_form_t form) {
582 switch (form) {
583 case DW_FORM_sdata:
584 case DW_FORM_udata:
585 case DW_FORM_data1:
586 case DW_FORM_data2:
587 case DW_FORM_data4:
588 case DW_FORM_data8:
589 return true;
590 }
591 return false;
592}
593
594bool DWARFFormValue::FormIsSupported(dw_form_t form) {
595 switch (form) {
596 case DW_FORM_addr:
597 case DW_FORM_addrx:
598 case DW_FORM_loclistx:
599 case DW_FORM_rnglistx:
600 case DW_FORM_block2:
601 case DW_FORM_block4:
602 case DW_FORM_data2:
603 case DW_FORM_data4:
604 case DW_FORM_data8:
605 case DW_FORM_string:
606 case DW_FORM_block:
607 case DW_FORM_block1:
608 case DW_FORM_data1:
609 case DW_FORM_flag:
610 case DW_FORM_sdata:
611 case DW_FORM_strp:
612 case DW_FORM_line_strp:
613 case DW_FORM_strx:
614 case DW_FORM_strx1:
615 case DW_FORM_strx2:
616 case DW_FORM_strx3:
617 case DW_FORM_strx4:
618 case DW_FORM_udata:
619 case DW_FORM_ref_addr:
620 case DW_FORM_ref1:
621 case DW_FORM_ref2:
622 case DW_FORM_ref4:
623 case DW_FORM_ref8:
624 case DW_FORM_ref_udata:
625 case DW_FORM_indirect:
626 case DW_FORM_sec_offset:
627 case DW_FORM_exprloc:
628 case DW_FORM_flag_present:
629 case DW_FORM_ref_sig8:
630 case DW_FORM_GNU_str_index:
631 case DW_FORM_GNU_addr_index:
632 case DW_FORM_implicit_const:
633 return true;
634 default:
635 break;
636 }
637 return false;
638}