Bug Summary

File:compiler-rt/lib/asan/asan_descriptions.cpp
Warning:line 467, column 3
Value stored to 'addr' is never read

Annotated Source Code

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clang -cc1 -triple i386-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name asan_descriptions.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 -mthread-model posix -mframe-pointer=none -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu i686 -dwarf-column-info -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-10/lib/clang/10.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/build-llvm/projects/compiler-rt/lib/asan -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/compiler-rt/lib/asan -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/build-llvm/include -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/compiler-rt/lib/asan/.. -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0/32 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/i386-pc-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-10/lib/clang/10.0.0/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -O3 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -Wno-unused-parameter -Wno-variadic-macros -Wno-non-virtual-dtor -std=c++14 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/build-llvm/projects/compiler-rt/lib/asan -fdebug-prefix-map=/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809=. -ferror-limit 19 -fmessage-length 0 -fvisibility hidden -fvisibility-inlines-hidden -fno-builtin -fno-rtti -fgnuc-version=4.2.1 -fobjc-runtime=gcc -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2019-12-05-225554-32688-1 -x c++ /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/compiler-rt/lib/asan/asan_descriptions.cpp
1//===-- asan_descriptions.cpp -----------------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file is a part of AddressSanitizer, an address sanity checker.
10//
11// ASan functions for getting information about an address and/or printing it.
12//===----------------------------------------------------------------------===//
13
14#include "asan_descriptions.h"
15#include "asan_mapping.h"
16#include "asan_report.h"
17#include "asan_stack.h"
18#include "sanitizer_common/sanitizer_stackdepot.h"
19
20namespace __asan {
21
22AsanThreadIdAndName::AsanThreadIdAndName(AsanThreadContext *t) {
23 Init(t->tid, t->name);
24}
25
26AsanThreadIdAndName::AsanThreadIdAndName(u32 tid) {
27 if (tid == kInvalidTid) {
28 Init(tid, "");
29 } else {
30 asanThreadRegistry().CheckLocked();
31 AsanThreadContext *t = GetThreadContextByTidLocked(tid);
32 Init(tid, t->name);
33 }
34}
35
36void AsanThreadIdAndName::Init(u32 tid, const char *tname) {
37 int len = internal_snprintf(name, sizeof(name), "T%d", tid);
38 CHECK(((unsigned int)len) < sizeof(name))do { __sanitizer::u64 v1 = (__sanitizer::u64)((((unsigned int
)len) < sizeof(name))); __sanitizer::u64 v2 = (__sanitizer
::u64)(0); if (__builtin_expect(!!(!(v1 != v2)), 0)) __sanitizer
::CheckFailed("/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/compiler-rt/lib/asan/asan_descriptions.cpp"
, 38, "(" "(((unsigned int)len) < sizeof(name))" ") " "!="
" (" "0" ")", v1, v2); } while (false)
;
39 if (tname[0] != '\0')
40 internal_snprintf(&name[len], sizeof(name) - len, " (%s)", tname);
41}
42
43void DescribeThread(AsanThreadContext *context) {
44 CHECK(context)do { __sanitizer::u64 v1 = (__sanitizer::u64)((context)); __sanitizer
::u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect(!!(!(v1
!= v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/compiler-rt/lib/asan/asan_descriptions.cpp"
, 44, "(" "(context)" ") " "!=" " (" "0" ")", v1, v2); } while
(false)
;
45 asanThreadRegistry().CheckLocked();
46 // No need to announce the main thread.
47 if (context->tid == 0 || context->announced) {
48 return;
49 }
50 context->announced = true;
51 InternalScopedString str(1024);
52 str.append("Thread %s", AsanThreadIdAndName(context).c_str());
53 if (context->parent_tid == kInvalidTid) {
54 str.append(" created by unknown thread\n");
55 Printf("%s", str.data());
56 return;
57 }
58 str.append(" created by %s here:\n",
59 AsanThreadIdAndName(context->parent_tid).c_str());
60 Printf("%s", str.data());
61 StackDepotGet(context->stack_id).Print();
62 // Recursively described parent thread if needed.
63 if (flags()->print_full_thread_history) {
64 AsanThreadContext *parent_context =
65 GetThreadContextByTidLocked(context->parent_tid);
66 DescribeThread(parent_context);
67 }
68}
69
70// Shadow descriptions
71static bool GetShadowKind(uptr addr, ShadowKind *shadow_kind) {
72 CHECK(!AddrIsInMem(addr))do { __sanitizer::u64 v1 = (__sanitizer::u64)((!AddrIsInMem(addr
))); __sanitizer::u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect
(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/compiler-rt/lib/asan/asan_descriptions.cpp"
, 72, "(" "(!AddrIsInMem(addr))" ") " "!=" " (" "0" ")", v1, v2
); } while (false)
;
73 if (AddrIsInShadowGap(addr)) {
74 *shadow_kind = kShadowKindGap;
75 } else if (AddrIsInHighShadow(addr)) {
76 *shadow_kind = kShadowKindHigh;
77 } else if (AddrIsInLowShadow(addr)) {
78 *shadow_kind = kShadowKindLow;
79 } else {
80 CHECK(0 && "Address is not in memory and not in shadow?")do { __sanitizer::u64 v1 = (__sanitizer::u64)((0 && "Address is not in memory and not in shadow?"
)); __sanitizer::u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect
(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/compiler-rt/lib/asan/asan_descriptions.cpp"
, 80, "(" "(0 && \"Address is not in memory and not in shadow?\")"
") " "!=" " (" "0" ")", v1, v2); } while (false)
;
81 return false;
82 }
83 return true;
84}
85
86bool DescribeAddressIfShadow(uptr addr) {
87 ShadowAddressDescription descr;
88 if (!GetShadowAddressInformation(addr, &descr)) return false;
89 descr.Print();
90 return true;
91}
92
93bool GetShadowAddressInformation(uptr addr, ShadowAddressDescription *descr) {
94 if (AddrIsInMem(addr)) return false;
95 ShadowKind shadow_kind;
96 if (!GetShadowKind(addr, &shadow_kind)) return false;
97 if (shadow_kind != kShadowKindGap) descr->shadow_byte = *(u8 *)addr;
98 descr->addr = addr;
99 descr->kind = shadow_kind;
100 return true;
101}
102
103// Heap descriptions
104static void GetAccessToHeapChunkInformation(ChunkAccess *descr,
105 AsanChunkView chunk, uptr addr,
106 uptr access_size) {
107 descr->bad_addr = addr;
108 if (chunk.AddrIsAtLeft(addr, access_size, &descr->offset)) {
109 descr->access_type = kAccessTypeLeft;
110 } else if (chunk.AddrIsAtRight(addr, access_size, &descr->offset)) {
111 descr->access_type = kAccessTypeRight;
112 if (descr->offset < 0) {
113 descr->bad_addr -= descr->offset;
114 descr->offset = 0;
115 }
116 } else if (chunk.AddrIsInside(addr, access_size, &descr->offset)) {
117 descr->access_type = kAccessTypeInside;
118 } else {
119 descr->access_type = kAccessTypeUnknown;
120 }
121 descr->chunk_begin = chunk.Beg();
122 descr->chunk_size = chunk.UsedSize();
123 descr->user_requested_alignment = chunk.UserRequestedAlignment();
124 descr->alloc_type = chunk.GetAllocType();
125}
126
127static void PrintHeapChunkAccess(uptr addr, const ChunkAccess &descr) {
128 Decorator d;
129 InternalScopedString str(4096);
130 str.append("%s", d.Location());
131 switch (descr.access_type) {
132 case kAccessTypeLeft:
133 str.append("%p is located %zd bytes to the left of",
134 (void *)descr.bad_addr, descr.offset);
135 break;
136 case kAccessTypeRight:
137 str.append("%p is located %zd bytes to the right of",
138 (void *)descr.bad_addr, descr.offset);
139 break;
140 case kAccessTypeInside:
141 str.append("%p is located %zd bytes inside of", (void *)descr.bad_addr,
142 descr.offset);
143 break;
144 case kAccessTypeUnknown:
145 str.append(
146 "%p is located somewhere around (this is AddressSanitizer bug!)",
147 (void *)descr.bad_addr);
148 }
149 str.append(" %zu-byte region [%p,%p)\n", descr.chunk_size,
150 (void *)descr.chunk_begin,
151 (void *)(descr.chunk_begin + descr.chunk_size));
152 str.append("%s", d.Default());
153 Printf("%s", str.data());
154}
155
156bool GetHeapAddressInformation(uptr addr, uptr access_size,
157 HeapAddressDescription *descr) {
158 AsanChunkView chunk = FindHeapChunkByAddress(addr);
159 if (!chunk.IsValid()) {
160 return false;
161 }
162 descr->addr = addr;
163 GetAccessToHeapChunkInformation(&descr->chunk_access, chunk, addr,
164 access_size);
165 CHECK_NE(chunk.AllocTid(), kInvalidTid)do { __sanitizer::u64 v1 = (__sanitizer::u64)((chunk.AllocTid
())); __sanitizer::u64 v2 = (__sanitizer::u64)((kInvalidTid))
; if (__builtin_expect(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed
("/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/compiler-rt/lib/asan/asan_descriptions.cpp"
, 165, "(" "(chunk.AllocTid())" ") " "!=" " (" "(kInvalidTid)"
")", v1, v2); } while (false)
;
166 descr->alloc_tid = chunk.AllocTid();
167 descr->alloc_stack_id = chunk.GetAllocStackId();
168 descr->free_tid = chunk.FreeTid();
169 if (descr->free_tid != kInvalidTid)
170 descr->free_stack_id = chunk.GetFreeStackId();
171 return true;
172}
173
174static StackTrace GetStackTraceFromId(u32 id) {
175 CHECK(id)do { __sanitizer::u64 v1 = (__sanitizer::u64)((id)); __sanitizer
::u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect(!!(!(v1
!= v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/compiler-rt/lib/asan/asan_descriptions.cpp"
, 175, "(" "(id)" ") " "!=" " (" "0" ")", v1, v2); } while (false
)
;
176 StackTrace res = StackDepotGet(id);
177 CHECK(res.trace)do { __sanitizer::u64 v1 = (__sanitizer::u64)((res.trace)); __sanitizer
::u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect(!!(!(v1
!= v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/compiler-rt/lib/asan/asan_descriptions.cpp"
, 177, "(" "(res.trace)" ") " "!=" " (" "0" ")", v1, v2); } while
(false)
;
178 return res;
179}
180
181bool DescribeAddressIfHeap(uptr addr, uptr access_size) {
182 HeapAddressDescription descr;
183 if (!GetHeapAddressInformation(addr, access_size, &descr)) {
184 Printf(
185 "AddressSanitizer can not describe address in more detail "
186 "(wild memory access suspected).\n");
187 return false;
188 }
189 descr.Print();
190 return true;
191}
192
193// Stack descriptions
194bool GetStackAddressInformation(uptr addr, uptr access_size,
195 StackAddressDescription *descr) {
196 AsanThread *t = FindThreadByStackAddress(addr);
197 if (!t) return false;
198
199 descr->addr = addr;
200 descr->tid = t->tid();
201 // Try to fetch precise stack frame for this access.
202 AsanThread::StackFrameAccess access;
203 if (!t->GetStackFrameAccessByAddr(addr, &access)) {
204 descr->frame_descr = nullptr;
205 return true;
206 }
207
208 descr->offset = access.offset;
209 descr->access_size = access_size;
210 descr->frame_pc = access.frame_pc;
211 descr->frame_descr = access.frame_descr;
212
213#if SANITIZER_PPC64V10
214 // On PowerPC64 ELFv1, the address of a function actually points to a
215 // three-doubleword data structure with the first field containing
216 // the address of the function's code.
217 descr->frame_pc = *reinterpret_cast<uptr *>(descr->frame_pc);
218#endif
219 descr->frame_pc += 16;
220
221 return true;
222}
223
224static void PrintAccessAndVarIntersection(const StackVarDescr &var, uptr addr,
225 uptr access_size, uptr prev_var_end,
226 uptr next_var_beg) {
227 uptr var_end = var.beg + var.size;
228 uptr addr_end = addr + access_size;
229 const char *pos_descr = nullptr;
230 // If the variable [var.beg, var_end) is the nearest variable to the
231 // current memory access, indicate it in the log.
232 if (addr >= var.beg) {
233 if (addr_end <= var_end)
234 pos_descr = "is inside"; // May happen if this is a use-after-return.
235 else if (addr < var_end)
236 pos_descr = "partially overflows";
237 else if (addr_end <= next_var_beg &&
238 next_var_beg - addr_end >= addr - var_end)
239 pos_descr = "overflows";
240 } else {
241 if (addr_end > var.beg)
242 pos_descr = "partially underflows";
243 else if (addr >= prev_var_end && addr - prev_var_end >= var.beg - addr_end)
244 pos_descr = "underflows";
245 }
246 InternalScopedString str(1024);
247 str.append(" [%zd, %zd)", var.beg, var_end);
248 // Render variable name.
249 str.append(" '");
250 for (uptr i = 0; i < var.name_len; ++i) {
251 str.append("%c", var.name_pos[i]);
252 }
253 str.append("'");
254 if (var.line > 0) {
255 str.append(" (line %d)", var.line);
256 }
257 if (pos_descr) {
258 Decorator d;
259 // FIXME: we may want to also print the size of the access here,
260 // but in case of accesses generated by memset it may be confusing.
261 str.append("%s <== Memory access at offset %zd %s this variable%s\n",
262 d.Location(), addr, pos_descr, d.Default());
263 } else {
264 str.append("\n");
265 }
266 Printf("%s", str.data());
267}
268
269bool DescribeAddressIfStack(uptr addr, uptr access_size) {
270 StackAddressDescription descr;
271 if (!GetStackAddressInformation(addr, access_size, &descr)) return false;
272 descr.Print();
273 return true;
274}
275
276// Global descriptions
277static void DescribeAddressRelativeToGlobal(uptr addr, uptr access_size,
278 const __asan_global &g) {
279 InternalScopedString str(4096);
280 Decorator d;
281 str.append("%s", d.Location());
282 if (addr < g.beg) {
283 str.append("%p is located %zd bytes to the left", (void *)addr,
284 g.beg - addr);
285 } else if (addr + access_size > g.beg + g.size) {
286 if (addr < g.beg + g.size) addr = g.beg + g.size;
287 str.append("%p is located %zd bytes to the right", (void *)addr,
288 addr - (g.beg + g.size));
289 } else {
290 // Can it happen?
291 str.append("%p is located %zd bytes inside", (void *)addr, addr - g.beg);
292 }
293 str.append(" of global variable '%s' defined in '",
294 MaybeDemangleGlobalName(g.name));
295 PrintGlobalLocation(&str, g);
296 str.append("' (0x%zx) of size %zu\n", g.beg, g.size);
297 str.append("%s", d.Default());
298 PrintGlobalNameIfASCII(&str, g);
299 Printf("%s", str.data());
300}
301
302bool GetGlobalAddressInformation(uptr addr, uptr access_size,
303 GlobalAddressDescription *descr) {
304 descr->addr = addr;
305 int globals_num = GetGlobalsForAddress(addr, descr->globals, descr->reg_sites,
306 ARRAY_SIZE(descr->globals)(sizeof(descr->globals)/sizeof((descr->globals)[0])));
307 descr->size = globals_num;
308 descr->access_size = access_size;
309 return globals_num != 0;
310}
311
312bool DescribeAddressIfGlobal(uptr addr, uptr access_size,
313 const char *bug_type) {
314 GlobalAddressDescription descr;
315 if (!GetGlobalAddressInformation(addr, access_size, &descr)) return false;
316
317 descr.Print(bug_type);
318 return true;
319}
320
321void ShadowAddressDescription::Print() const {
322 Printf("Address %p is located in the %s area.\n", addr, ShadowNames[kind]);
323}
324
325void GlobalAddressDescription::Print(const char *bug_type) const {
326 for (int i = 0; i < size; i++) {
327 DescribeAddressRelativeToGlobal(addr, access_size, globals[i]);
328 if (bug_type &&
329 0 == internal_strcmp(bug_type, "initialization-order-fiasco") &&
330 reg_sites[i]) {
331 Printf(" registered at:\n");
332 StackDepotGet(reg_sites[i]).Print();
333 }
334 }
335}
336
337bool GlobalAddressDescription::PointsInsideTheSameVariable(
338 const GlobalAddressDescription &other) const {
339 if (size == 0 || other.size == 0) return false;
340
341 for (uptr i = 0; i < size; i++) {
342 const __asan_global &a = globals[i];
343 for (uptr j = 0; j < other.size; j++) {
344 const __asan_global &b = other.globals[j];
345 if (a.beg == b.beg &&
346 a.beg <= addr &&
347 b.beg <= other.addr &&
348 (addr + access_size) < (a.beg + a.size) &&
349 (other.addr + other.access_size) < (b.beg + b.size))
350 return true;
351 }
352 }
353
354 return false;
355}
356
357void StackAddressDescription::Print() const {
358 Decorator d;
359 Printf("%s", d.Location());
360 Printf("Address %p is located in stack of thread %s", addr,
361 AsanThreadIdAndName(tid).c_str());
362
363 if (!frame_descr) {
364 Printf("%s\n", d.Default());
365 return;
366 }
367 Printf(" at offset %zu in frame%s\n", offset, d.Default());
368
369 // Now we print the frame where the alloca has happened.
370 // We print this frame as a stack trace with one element.
371 // The symbolizer may print more than one frame if inlining was involved.
372 // The frame numbers may be different than those in the stack trace printed
373 // previously. That's unfortunate, but I have no better solution,
374 // especially given that the alloca may be from entirely different place
375 // (e.g. use-after-scope, or different thread's stack).
376 Printf("%s", d.Default());
377 StackTrace alloca_stack(&frame_pc, 1);
378 alloca_stack.Print();
379
380 InternalMmapVector<StackVarDescr> vars;
381 vars.reserve(16);
382 if (!ParseFrameDescription(frame_descr, &vars)) {
383 Printf(
384 "AddressSanitizer can't parse the stack frame "
385 "descriptor: |%s|\n",
386 frame_descr);
387 // 'addr' is a stack address, so return true even if we can't parse frame
388 return;
389 }
390 uptr n_objects = vars.size();
391 // Report the number of stack objects.
392 Printf(" This frame has %zu object(s):\n", n_objects);
393
394 // Report all objects in this frame.
395 for (uptr i = 0; i < n_objects; i++) {
396 uptr prev_var_end = i ? vars[i - 1].beg + vars[i - 1].size : 0;
397 uptr next_var_beg = i + 1 < n_objects ? vars[i + 1].beg : ~(0UL);
398 PrintAccessAndVarIntersection(vars[i], offset, access_size, prev_var_end,
399 next_var_beg);
400 }
401 Printf(
402 "HINT: this may be a false positive if your program uses "
403 "some custom stack unwind mechanism, swapcontext or vfork\n");
404 if (SANITIZER_WINDOWS0)
405 Printf(" (longjmp, SEH and C++ exceptions *are* supported)\n");
406 else
407 Printf(" (longjmp and C++ exceptions *are* supported)\n");
408
409 DescribeThread(GetThreadContextByTidLocked(tid));
410}
411
412void HeapAddressDescription::Print() const {
413 PrintHeapChunkAccess(addr, chunk_access);
414
415 asanThreadRegistry().CheckLocked();
416 AsanThreadContext *alloc_thread = GetThreadContextByTidLocked(alloc_tid);
417 StackTrace alloc_stack = GetStackTraceFromId(alloc_stack_id);
418
419 Decorator d;
420 AsanThreadContext *free_thread = nullptr;
421 if (free_tid != kInvalidTid) {
422 free_thread = GetThreadContextByTidLocked(free_tid);
423 Printf("%sfreed by thread %s here:%s\n", d.Allocation(),
424 AsanThreadIdAndName(free_thread).c_str(), d.Default());
425 StackTrace free_stack = GetStackTraceFromId(free_stack_id);
426 free_stack.Print();
427 Printf("%spreviously allocated by thread %s here:%s\n", d.Allocation(),
428 AsanThreadIdAndName(alloc_thread).c_str(), d.Default());
429 } else {
430 Printf("%sallocated by thread %s here:%s\n", d.Allocation(),
431 AsanThreadIdAndName(alloc_thread).c_str(), d.Default());
432 }
433 alloc_stack.Print();
434 DescribeThread(GetCurrentThread());
435 if (free_thread) DescribeThread(free_thread);
436 DescribeThread(alloc_thread);
437}
438
439AddressDescription::AddressDescription(uptr addr, uptr access_size,
440 bool shouldLockThreadRegistry) {
441 if (GetShadowAddressInformation(addr, &data.shadow)) {
442 data.kind = kAddressKindShadow;
443 return;
444 }
445 if (GetHeapAddressInformation(addr, access_size, &data.heap)) {
446 data.kind = kAddressKindHeap;
447 return;
448 }
449
450 bool isStackMemory = false;
451 if (shouldLockThreadRegistry) {
452 ThreadRegistryLock l(&asanThreadRegistry());
453 isStackMemory = GetStackAddressInformation(addr, access_size, &data.stack);
454 } else {
455 isStackMemory = GetStackAddressInformation(addr, access_size, &data.stack);
456 }
457 if (isStackMemory) {
458 data.kind = kAddressKindStack;
459 return;
460 }
461
462 if (GetGlobalAddressInformation(addr, access_size, &data.global)) {
463 data.kind = kAddressKindGlobal;
464 return;
465 }
466 data.kind = kAddressKindWild;
467 addr = 0;
Value stored to 'addr' is never read
468}
469
470void PrintAddressDescription(uptr addr, uptr access_size,
471 const char *bug_type) {
472 ShadowAddressDescription shadow_descr;
473 if (GetShadowAddressInformation(addr, &shadow_descr)) {
474 shadow_descr.Print();
475 return;
476 }
477
478 GlobalAddressDescription global_descr;
479 if (GetGlobalAddressInformation(addr, access_size, &global_descr)) {
480 global_descr.Print(bug_type);
481 return;
482 }
483
484 StackAddressDescription stack_descr;
485 if (GetStackAddressInformation(addr, access_size, &stack_descr)) {
486 stack_descr.Print();
487 return;
488 }
489
490 HeapAddressDescription heap_descr;
491 if (GetHeapAddressInformation(addr, access_size, &heap_descr)) {
492 heap_descr.Print();
493 return;
494 }
495
496 // We exhausted our possibilities. Bail out.
497 Printf(
498 "AddressSanitizer can not describe address in more detail "
499 "(wild memory access suspected).\n");
500}
501} // namespace __asan