| File: | build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/lldb/source/Plugins/DynamicLoader/Hexagon-DYLD/HexagonDYLDRendezvous.cpp |
| Warning: | line 280, column 9 Although the value stored to 'addr' is used in the enclosing expression, the value is never actually read from 'addr' |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
| 1 | //===-- HexagonDYLDRendezvous.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 "lldb/Core/Module.h" |
| 10 | #include "lldb/Symbol/Symbol.h" |
| 11 | #include "lldb/Symbol/SymbolContext.h" |
| 12 | #include "lldb/Target/Process.h" |
| 13 | #include "lldb/Target/Target.h" |
| 14 | #include "lldb/Utility/Log.h" |
| 15 | #include "lldb/Utility/Status.h" |
| 16 | |
| 17 | #include "lldb/Symbol/ObjectFile.h" |
| 18 | #include "lldb/Target/Process.h" |
| 19 | #include "lldb/Target/Target.h" |
| 20 | |
| 21 | #include "HexagonDYLDRendezvous.h" |
| 22 | |
| 23 | using namespace lldb; |
| 24 | using namespace lldb_private; |
| 25 | |
| 26 | /// Locates the address of the rendezvous structure. Returns the address on |
| 27 | /// success and LLDB_INVALID_ADDRESS on failure. |
| 28 | static addr_t ResolveRendezvousAddress(Process *process) { |
| 29 | addr_t info_location; |
| 30 | addr_t info_addr; |
| 31 | Status error; |
| 32 | |
| 33 | info_location = process->GetImageInfoAddress(); |
| 34 | |
| 35 | if (info_location == LLDB_INVALID_ADDRESS(18446744073709551615UL)) |
| 36 | return LLDB_INVALID_ADDRESS(18446744073709551615UL); |
| 37 | |
| 38 | info_addr = process->ReadPointerFromMemory(info_location, error); |
| 39 | if (error.Fail()) |
| 40 | return LLDB_INVALID_ADDRESS(18446744073709551615UL); |
| 41 | |
| 42 | if (info_addr == 0) |
| 43 | return LLDB_INVALID_ADDRESS(18446744073709551615UL); |
| 44 | |
| 45 | return info_addr; |
| 46 | } |
| 47 | |
| 48 | HexagonDYLDRendezvous::HexagonDYLDRendezvous(Process *process) |
| 49 | : m_process(process), m_rendezvous_addr(LLDB_INVALID_ADDRESS(18446744073709551615UL)), m_current(), |
| 50 | m_previous(), m_soentries(), m_added_soentries(), m_removed_soentries() { |
| 51 | m_thread_info.valid = false; |
| 52 | |
| 53 | // Cache a copy of the executable path |
| 54 | if (m_process) { |
| 55 | Module *exe_mod = m_process->GetTarget().GetExecutableModulePointer(); |
| 56 | if (exe_mod) |
| 57 | exe_mod->GetFileSpec().GetPath(m_exe_path, PATH_MAX4096); |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | bool HexagonDYLDRendezvous::Resolve() { |
| 62 | const size_t word_size = 4; |
| 63 | Rendezvous info; |
| 64 | size_t address_size; |
| 65 | size_t padding; |
| 66 | addr_t info_addr; |
| 67 | addr_t cursor; |
| 68 | |
| 69 | address_size = m_process->GetAddressByteSize(); |
| 70 | padding = address_size - word_size; |
| 71 | |
| 72 | if (m_rendezvous_addr == LLDB_INVALID_ADDRESS(18446744073709551615UL)) |
| 73 | cursor = info_addr = ResolveRendezvousAddress(m_process); |
| 74 | else |
| 75 | cursor = info_addr = m_rendezvous_addr; |
| 76 | |
| 77 | if (cursor == LLDB_INVALID_ADDRESS(18446744073709551615UL)) |
| 78 | return false; |
| 79 | |
| 80 | if (!(cursor = ReadWord(cursor, &info.version, word_size))) |
| 81 | return false; |
| 82 | |
| 83 | if (!(cursor = ReadPointer(cursor + padding, &info.map_addr))) |
| 84 | return false; |
| 85 | |
| 86 | if (!(cursor = ReadPointer(cursor, &info.brk))) |
| 87 | return false; |
| 88 | |
| 89 | if (!(cursor = ReadWord(cursor, &info.state, word_size))) |
| 90 | return false; |
| 91 | |
| 92 | if (!(cursor = ReadPointer(cursor + padding, &info.ldbase))) |
| 93 | return false; |
| 94 | |
| 95 | // The rendezvous was successfully read. Update our internal state. |
| 96 | m_rendezvous_addr = info_addr; |
| 97 | m_previous = m_current; |
| 98 | m_current = info; |
| 99 | |
| 100 | return UpdateSOEntries(); |
| 101 | } |
| 102 | |
| 103 | void HexagonDYLDRendezvous::SetRendezvousAddress(lldb::addr_t addr) { |
| 104 | m_rendezvous_addr = addr; |
| 105 | } |
| 106 | |
| 107 | bool HexagonDYLDRendezvous::IsValid() { |
| 108 | return m_rendezvous_addr != LLDB_INVALID_ADDRESS(18446744073709551615UL); |
| 109 | } |
| 110 | |
| 111 | bool HexagonDYLDRendezvous::UpdateSOEntries() { |
| 112 | SOEntry entry; |
| 113 | |
| 114 | if (m_current.map_addr == 0) |
| 115 | return false; |
| 116 | |
| 117 | // When the previous and current states are consistent this is the first time |
| 118 | // we have been asked to update. Just take a snapshot of the currently |
| 119 | // loaded modules. |
| 120 | if (m_previous.state == eConsistent && m_current.state == eConsistent) |
| 121 | return TakeSnapshot(m_soentries); |
| 122 | |
| 123 | // If we are about to add or remove a shared object clear out the current |
| 124 | // state and take a snapshot of the currently loaded images. |
| 125 | if (m_current.state == eAdd || m_current.state == eDelete) { |
| 126 | // this is a fudge so that we can clear the assert below. |
| 127 | m_previous.state = eConsistent; |
| 128 | // We hit this assert on the 2nd run of this function after running the |
| 129 | // calc example |
| 130 | assert(m_previous.state == eConsistent)(static_cast <bool> (m_previous.state == eConsistent) ? void (0) : __assert_fail ("m_previous.state == eConsistent", "lldb/source/Plugins/DynamicLoader/Hexagon-DYLD/HexagonDYLDRendezvous.cpp" , 130, __extension__ __PRETTY_FUNCTION__)); |
| 131 | m_soentries.clear(); |
| 132 | m_added_soentries.clear(); |
| 133 | m_removed_soentries.clear(); |
| 134 | return TakeSnapshot(m_soentries); |
| 135 | } |
| 136 | assert(m_current.state == eConsistent)(static_cast <bool> (m_current.state == eConsistent) ? void (0) : __assert_fail ("m_current.state == eConsistent", "lldb/source/Plugins/DynamicLoader/Hexagon-DYLD/HexagonDYLDRendezvous.cpp" , 136, __extension__ __PRETTY_FUNCTION__)); |
| 137 | |
| 138 | // Otherwise check the previous state to determine what to expect and update |
| 139 | // accordingly. |
| 140 | if (m_previous.state == eAdd) |
| 141 | return UpdateSOEntriesForAddition(); |
| 142 | else if (m_previous.state == eDelete) |
| 143 | return UpdateSOEntriesForDeletion(); |
| 144 | |
| 145 | return false; |
| 146 | } |
| 147 | |
| 148 | bool HexagonDYLDRendezvous::UpdateSOEntriesForAddition() { |
| 149 | SOEntry entry; |
| 150 | iterator pos; |
| 151 | |
| 152 | assert(m_previous.state == eAdd)(static_cast <bool> (m_previous.state == eAdd) ? void ( 0) : __assert_fail ("m_previous.state == eAdd", "lldb/source/Plugins/DynamicLoader/Hexagon-DYLD/HexagonDYLDRendezvous.cpp" , 152, __extension__ __PRETTY_FUNCTION__)); |
| 153 | |
| 154 | if (m_current.map_addr == 0) |
| 155 | return false; |
| 156 | |
| 157 | for (addr_t cursor = m_current.map_addr; cursor != 0; cursor = entry.next) { |
| 158 | if (!ReadSOEntryFromMemory(cursor, entry)) |
| 159 | return false; |
| 160 | |
| 161 | // Only add shared libraries and not the executable. On Linux this is |
| 162 | // indicated by an empty path in the entry. On FreeBSD it is the name of |
| 163 | // the executable. |
| 164 | if (entry.path.empty() || ::strcmp(entry.path.c_str(), m_exe_path) == 0) |
| 165 | continue; |
| 166 | |
| 167 | pos = std::find(m_soentries.begin(), m_soentries.end(), entry); |
| 168 | if (pos == m_soentries.end()) { |
| 169 | m_soentries.push_back(entry); |
| 170 | m_added_soentries.push_back(entry); |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | return true; |
| 175 | } |
| 176 | |
| 177 | bool HexagonDYLDRendezvous::UpdateSOEntriesForDeletion() { |
| 178 | SOEntryList entry_list; |
| 179 | iterator pos; |
| 180 | |
| 181 | assert(m_previous.state == eDelete)(static_cast <bool> (m_previous.state == eDelete) ? void (0) : __assert_fail ("m_previous.state == eDelete", "lldb/source/Plugins/DynamicLoader/Hexagon-DYLD/HexagonDYLDRendezvous.cpp" , 181, __extension__ __PRETTY_FUNCTION__)); |
| 182 | |
| 183 | if (!TakeSnapshot(entry_list)) |
| 184 | return false; |
| 185 | |
| 186 | for (iterator I = begin(); I != end(); ++I) { |
| 187 | pos = std::find(entry_list.begin(), entry_list.end(), *I); |
| 188 | if (pos == entry_list.end()) |
| 189 | m_removed_soentries.push_back(*I); |
| 190 | } |
| 191 | |
| 192 | m_soentries = entry_list; |
| 193 | return true; |
| 194 | } |
| 195 | |
| 196 | bool HexagonDYLDRendezvous::TakeSnapshot(SOEntryList &entry_list) { |
| 197 | SOEntry entry; |
| 198 | |
| 199 | if (m_current.map_addr == 0) |
| 200 | return false; |
| 201 | |
| 202 | for (addr_t cursor = m_current.map_addr; cursor != 0; cursor = entry.next) { |
| 203 | if (!ReadSOEntryFromMemory(cursor, entry)) |
| 204 | return false; |
| 205 | |
| 206 | // Only add shared libraries and not the executable. On Linux this is |
| 207 | // indicated by an empty path in the entry. On FreeBSD it is the name of |
| 208 | // the executable. |
| 209 | if (entry.path.empty() || ::strcmp(entry.path.c_str(), m_exe_path) == 0) |
| 210 | continue; |
| 211 | |
| 212 | entry_list.push_back(entry); |
| 213 | } |
| 214 | |
| 215 | return true; |
| 216 | } |
| 217 | |
| 218 | addr_t HexagonDYLDRendezvous::ReadWord(addr_t addr, uint64_t *dst, |
| 219 | size_t size) { |
| 220 | Status error; |
| 221 | |
| 222 | *dst = m_process->ReadUnsignedIntegerFromMemory(addr, size, 0, error); |
| 223 | if (error.Fail()) |
| 224 | return 0; |
| 225 | |
| 226 | return addr + size; |
| 227 | } |
| 228 | |
| 229 | addr_t HexagonDYLDRendezvous::ReadPointer(addr_t addr, addr_t *dst) { |
| 230 | Status error; |
| 231 | |
| 232 | *dst = m_process->ReadPointerFromMemory(addr, error); |
| 233 | if (error.Fail()) |
| 234 | return 0; |
| 235 | |
| 236 | return addr + m_process->GetAddressByteSize(); |
| 237 | } |
| 238 | |
| 239 | std::string HexagonDYLDRendezvous::ReadStringFromMemory(addr_t addr) { |
| 240 | std::string str; |
| 241 | Status error; |
| 242 | size_t size; |
| 243 | char c; |
| 244 | |
| 245 | if (addr == LLDB_INVALID_ADDRESS(18446744073709551615UL)) |
| 246 | return std::string(); |
| 247 | |
| 248 | for (;;) { |
| 249 | size = m_process->ReadMemory(addr, &c, 1, error); |
| 250 | if (size != 1 || error.Fail()) |
| 251 | return std::string(); |
| 252 | if (c == 0) |
| 253 | break; |
| 254 | else { |
| 255 | str.push_back(c); |
| 256 | addr++; |
| 257 | } |
| 258 | } |
| 259 | |
| 260 | return str; |
| 261 | } |
| 262 | |
| 263 | bool HexagonDYLDRendezvous::ReadSOEntryFromMemory(lldb::addr_t addr, |
| 264 | SOEntry &entry) { |
| 265 | entry.clear(); |
| 266 | entry.link_addr = addr; |
| 267 | |
| 268 | if (!(addr = ReadPointer(addr, &entry.base_addr))) |
| 269 | return false; |
| 270 | |
| 271 | if (!(addr = ReadPointer(addr, &entry.path_addr))) |
| 272 | return false; |
| 273 | |
| 274 | if (!(addr = ReadPointer(addr, &entry.dyn_addr))) |
| 275 | return false; |
| 276 | |
| 277 | if (!(addr = ReadPointer(addr, &entry.next))) |
| 278 | return false; |
| 279 | |
| 280 | if (!(addr = ReadPointer(addr, &entry.prev))) |
Although the value stored to 'addr' is used in the enclosing expression, the value is never actually read from 'addr' | |
| 281 | return false; |
| 282 | |
| 283 | entry.path = ReadStringFromMemory(entry.path_addr); |
| 284 | |
| 285 | return true; |
| 286 | } |
| 287 | |
| 288 | bool HexagonDYLDRendezvous::FindMetadata(const char *name, PThreadField field, |
| 289 | uint32_t &value) { |
| 290 | Target &target = m_process->GetTarget(); |
| 291 | |
| 292 | SymbolContextList list; |
| 293 | target.GetImages().FindSymbolsWithNameAndType(ConstString(name), |
| 294 | eSymbolTypeAny, list); |
| 295 | if (list.IsEmpty()) |
| 296 | return false; |
| 297 | |
| 298 | Address address = list[0].symbol->GetAddress(); |
| 299 | addr_t addr = address.GetLoadAddress(&target); |
| 300 | if (addr == LLDB_INVALID_ADDRESS(18446744073709551615UL)) |
| 301 | return false; |
| 302 | |
| 303 | Status error; |
| 304 | value = (uint32_t)m_process->ReadUnsignedIntegerFromMemory( |
| 305 | addr + field * sizeof(uint32_t), sizeof(uint32_t), 0, error); |
| 306 | if (error.Fail()) |
| 307 | return false; |
| 308 | |
| 309 | if (field == eSize) |
| 310 | value /= 8; // convert bits to bytes |
| 311 | |
| 312 | return true; |
| 313 | } |
| 314 | |
| 315 | const HexagonDYLDRendezvous::ThreadInfo & |
| 316 | HexagonDYLDRendezvous::GetThreadInfo() { |
| 317 | if (!m_thread_info.valid) { |
| 318 | bool ok = true; |
| 319 | |
| 320 | ok &= FindMetadata("_thread_db_pthread_dtvp", eOffset, |
| 321 | m_thread_info.dtv_offset); |
| 322 | ok &= |
| 323 | FindMetadata("_thread_db_dtv_dtv", eSize, m_thread_info.dtv_slot_size); |
| 324 | ok &= FindMetadata("_thread_db_link_map_l_tls_modid", eOffset, |
| 325 | m_thread_info.modid_offset); |
| 326 | ok &= FindMetadata("_thread_db_dtv_t_pointer_val", eOffset, |
| 327 | m_thread_info.tls_offset); |
| 328 | |
| 329 | if (ok) |
| 330 | m_thread_info.valid = true; |
| 331 | } |
| 332 | |
| 333 | return m_thread_info; |
| 334 | } |
| 335 | |
| 336 | void HexagonDYLDRendezvous::DumpToLog(Log *log) const { |
| 337 | int state = GetState(); |
| 338 | |
| 339 | if (!log) |
| 340 | return; |
| 341 | |
| 342 | log->PutCString("HexagonDYLDRendezvous:"); |
| 343 | LLDB_LOGF(log, " Address: %" PRIx64, GetRendezvousAddress())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" Address: %" "l" "x", GetRendezvousAddress ()); } while (0); |
| 344 | LLDB_LOGF(log, " Version: %" PRIu64, GetVersion())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" Version: %" "l" "u", GetVersion( )); } while (0); |
| 345 | LLDB_LOGF(log, " Link : %" PRIx64, GetLinkMapAddress())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" Link : %" "l" "x", GetLinkMapAddress ()); } while (0); |
| 346 | LLDB_LOGF(log, " Break : %" PRIx64, GetBreakAddress())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" Break : %" "l" "x", GetBreakAddress ()); } while (0); |
| 347 | LLDB_LOGF(log, " LDBase : %" PRIx64, GetLDBase())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" LDBase : %" "l" "x", GetLDBase() ); } while (0); |
| 348 | LLDB_LOGF(log, " State : %s",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" State : %s", (state == eConsistent ) ? "consistent" : (state == eAdd) ? "add" : (state == eDelete ) ? "delete" : "unknown"); } while (0) |
| 349 | (state == eConsistent)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" State : %s", (state == eConsistent ) ? "consistent" : (state == eAdd) ? "add" : (state == eDelete ) ? "delete" : "unknown"); } while (0) |
| 350 | ? "consistent"do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" State : %s", (state == eConsistent ) ? "consistent" : (state == eAdd) ? "add" : (state == eDelete ) ? "delete" : "unknown"); } while (0) |
| 351 | : (state == eAdd) ? "add"do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" State : %s", (state == eConsistent ) ? "consistent" : (state == eAdd) ? "add" : (state == eDelete ) ? "delete" : "unknown"); } while (0) |
| 352 | : (state == eDelete) ? "delete" : "unknown")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" State : %s", (state == eConsistent ) ? "consistent" : (state == eAdd) ? "add" : (state == eDelete ) ? "delete" : "unknown"); } while (0); |
| 353 | |
| 354 | iterator I = begin(); |
| 355 | iterator E = end(); |
| 356 | |
| 357 | if (I != E) |
| 358 | log->PutCString("HexagonDYLDRendezvous SOEntries:"); |
| 359 | |
| 360 | for (int i = 1; I != E; ++I, ++i) { |
| 361 | LLDB_LOGF(log, "\n SOEntry [%d] %s", i, I->path.c_str())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("\n SOEntry [%d] %s", i, I->path .c_str()); } while (0); |
| 362 | LLDB_LOGF(log, " Base : %" PRIx64, I->base_addr)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" Base : %" "l" "x", I->base_addr ); } while (0); |
| 363 | LLDB_LOGF(log, " Path : %" PRIx64, I->path_addr)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" Path : %" "l" "x", I->path_addr ); } while (0); |
| 364 | LLDB_LOGF(log, " Dyn : %" PRIx64, I->dyn_addr)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" Dyn : %" "l" "x", I->dyn_addr ); } while (0); |
| 365 | LLDB_LOGF(log, " Next : %" PRIx64, I->next)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" Next : %" "l" "x", I->next ); } while (0); |
| 366 | LLDB_LOGF(log, " Prev : %" PRIx64, I->prev)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" Prev : %" "l" "x", I->prev ); } while (0); |
| 367 | } |
| 368 | } |