1 //===-- DWARFExpression.cpp -------------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "lldb/Expression/DWARFExpression.h" 11 12 #include <vector> 13 14 #include "lldb/Core/DataEncoder.h" 15 #include "lldb/Core/dwarf.h" 16 #include "lldb/Core/Log.h" 17 #include "lldb/Core/RegisterValue.h" 18 #include "lldb/Core/StreamString.h" 19 #include "lldb/Core/Scalar.h" 20 #include "lldb/Core/Value.h" 21 #include "lldb/Core/VMRange.h" 22 23 #include "lldb/Expression/ClangExpressionDeclMap.h" 24 #include "lldb/Expression/ClangExpressionVariable.h" 25 26 #include "lldb/Host/Endian.h" 27 28 #include "lldb/lldb-private-log.h" 29 30 #include "lldb/Symbol/ClangASTType.h" 31 #include "lldb/Symbol/ClangASTContext.h" 32 #include "lldb/Symbol/Type.h" 33 34 #include "lldb/Target/ABI.h" 35 #include "lldb/Target/ExecutionContext.h" 36 #include "lldb/Target/Process.h" 37 #include "lldb/Target/RegisterContext.h" 38 #include "lldb/Target/StackFrame.h" 39 40 using namespace lldb; 41 using namespace lldb_private; 42 43 const char * 44 DW_OP_value_to_name (uint32_t val) 45 { 46 static char invalid[100]; 47 switch (val) { 48 case 0x03: return "DW_OP_addr"; 49 case 0x06: return "DW_OP_deref"; 50 case 0x08: return "DW_OP_const1u"; 51 case 0x09: return "DW_OP_const1s"; 52 case 0x0a: return "DW_OP_const2u"; 53 case 0x0b: return "DW_OP_const2s"; 54 case 0x0c: return "DW_OP_const4u"; 55 case 0x0d: return "DW_OP_const4s"; 56 case 0x0e: return "DW_OP_const8u"; 57 case 0x0f: return "DW_OP_const8s"; 58 case 0x10: return "DW_OP_constu"; 59 case 0x11: return "DW_OP_consts"; 60 case 0x12: return "DW_OP_dup"; 61 case 0x13: return "DW_OP_drop"; 62 case 0x14: return "DW_OP_over"; 63 case 0x15: return "DW_OP_pick"; 64 case 0x16: return "DW_OP_swap"; 65 case 0x17: return "DW_OP_rot"; 66 case 0x18: return "DW_OP_xderef"; 67 case 0x19: return "DW_OP_abs"; 68 case 0x1a: return "DW_OP_and"; 69 case 0x1b: return "DW_OP_div"; 70 case 0x1c: return "DW_OP_minus"; 71 case 0x1d: return "DW_OP_mod"; 72 case 0x1e: return "DW_OP_mul"; 73 case 0x1f: return "DW_OP_neg"; 74 case 0x20: return "DW_OP_not"; 75 case 0x21: return "DW_OP_or"; 76 case 0x22: return "DW_OP_plus"; 77 case 0x23: return "DW_OP_plus_uconst"; 78 case 0x24: return "DW_OP_shl"; 79 case 0x25: return "DW_OP_shr"; 80 case 0x26: return "DW_OP_shra"; 81 case 0x27: return "DW_OP_xor"; 82 case 0x2f: return "DW_OP_skip"; 83 case 0x28: return "DW_OP_bra"; 84 case 0x29: return "DW_OP_eq"; 85 case 0x2a: return "DW_OP_ge"; 86 case 0x2b: return "DW_OP_gt"; 87 case 0x2c: return "DW_OP_le"; 88 case 0x2d: return "DW_OP_lt"; 89 case 0x2e: return "DW_OP_ne"; 90 case 0x30: return "DW_OP_lit0"; 91 case 0x31: return "DW_OP_lit1"; 92 case 0x32: return "DW_OP_lit2"; 93 case 0x33: return "DW_OP_lit3"; 94 case 0x34: return "DW_OP_lit4"; 95 case 0x35: return "DW_OP_lit5"; 96 case 0x36: return "DW_OP_lit6"; 97 case 0x37: return "DW_OP_lit7"; 98 case 0x38: return "DW_OP_lit8"; 99 case 0x39: return "DW_OP_lit9"; 100 case 0x3a: return "DW_OP_lit10"; 101 case 0x3b: return "DW_OP_lit11"; 102 case 0x3c: return "DW_OP_lit12"; 103 case 0x3d: return "DW_OP_lit13"; 104 case 0x3e: return "DW_OP_lit14"; 105 case 0x3f: return "DW_OP_lit15"; 106 case 0x40: return "DW_OP_lit16"; 107 case 0x41: return "DW_OP_lit17"; 108 case 0x42: return "DW_OP_lit18"; 109 case 0x43: return "DW_OP_lit19"; 110 case 0x44: return "DW_OP_lit20"; 111 case 0x45: return "DW_OP_lit21"; 112 case 0x46: return "DW_OP_lit22"; 113 case 0x47: return "DW_OP_lit23"; 114 case 0x48: return "DW_OP_lit24"; 115 case 0x49: return "DW_OP_lit25"; 116 case 0x4a: return "DW_OP_lit26"; 117 case 0x4b: return "DW_OP_lit27"; 118 case 0x4c: return "DW_OP_lit28"; 119 case 0x4d: return "DW_OP_lit29"; 120 case 0x4e: return "DW_OP_lit30"; 121 case 0x4f: return "DW_OP_lit31"; 122 case 0x50: return "DW_OP_reg0"; 123 case 0x51: return "DW_OP_reg1"; 124 case 0x52: return "DW_OP_reg2"; 125 case 0x53: return "DW_OP_reg3"; 126 case 0x54: return "DW_OP_reg4"; 127 case 0x55: return "DW_OP_reg5"; 128 case 0x56: return "DW_OP_reg6"; 129 case 0x57: return "DW_OP_reg7"; 130 case 0x58: return "DW_OP_reg8"; 131 case 0x59: return "DW_OP_reg9"; 132 case 0x5a: return "DW_OP_reg10"; 133 case 0x5b: return "DW_OP_reg11"; 134 case 0x5c: return "DW_OP_reg12"; 135 case 0x5d: return "DW_OP_reg13"; 136 case 0x5e: return "DW_OP_reg14"; 137 case 0x5f: return "DW_OP_reg15"; 138 case 0x60: return "DW_OP_reg16"; 139 case 0x61: return "DW_OP_reg17"; 140 case 0x62: return "DW_OP_reg18"; 141 case 0x63: return "DW_OP_reg19"; 142 case 0x64: return "DW_OP_reg20"; 143 case 0x65: return "DW_OP_reg21"; 144 case 0x66: return "DW_OP_reg22"; 145 case 0x67: return "DW_OP_reg23"; 146 case 0x68: return "DW_OP_reg24"; 147 case 0x69: return "DW_OP_reg25"; 148 case 0x6a: return "DW_OP_reg26"; 149 case 0x6b: return "DW_OP_reg27"; 150 case 0x6c: return "DW_OP_reg28"; 151 case 0x6d: return "DW_OP_reg29"; 152 case 0x6e: return "DW_OP_reg30"; 153 case 0x6f: return "DW_OP_reg31"; 154 case 0x70: return "DW_OP_breg0"; 155 case 0x71: return "DW_OP_breg1"; 156 case 0x72: return "DW_OP_breg2"; 157 case 0x73: return "DW_OP_breg3"; 158 case 0x74: return "DW_OP_breg4"; 159 case 0x75: return "DW_OP_breg5"; 160 case 0x76: return "DW_OP_breg6"; 161 case 0x77: return "DW_OP_breg7"; 162 case 0x78: return "DW_OP_breg8"; 163 case 0x79: return "DW_OP_breg9"; 164 case 0x7a: return "DW_OP_breg10"; 165 case 0x7b: return "DW_OP_breg11"; 166 case 0x7c: return "DW_OP_breg12"; 167 case 0x7d: return "DW_OP_breg13"; 168 case 0x7e: return "DW_OP_breg14"; 169 case 0x7f: return "DW_OP_breg15"; 170 case 0x80: return "DW_OP_breg16"; 171 case 0x81: return "DW_OP_breg17"; 172 case 0x82: return "DW_OP_breg18"; 173 case 0x83: return "DW_OP_breg19"; 174 case 0x84: return "DW_OP_breg20"; 175 case 0x85: return "DW_OP_breg21"; 176 case 0x86: return "DW_OP_breg22"; 177 case 0x87: return "DW_OP_breg23"; 178 case 0x88: return "DW_OP_breg24"; 179 case 0x89: return "DW_OP_breg25"; 180 case 0x8a: return "DW_OP_breg26"; 181 case 0x8b: return "DW_OP_breg27"; 182 case 0x8c: return "DW_OP_breg28"; 183 case 0x8d: return "DW_OP_breg29"; 184 case 0x8e: return "DW_OP_breg30"; 185 case 0x8f: return "DW_OP_breg31"; 186 case 0x90: return "DW_OP_regx"; 187 case 0x91: return "DW_OP_fbreg"; 188 case 0x92: return "DW_OP_bregx"; 189 case 0x93: return "DW_OP_piece"; 190 case 0x94: return "DW_OP_deref_size"; 191 case 0x95: return "DW_OP_xderef_size"; 192 case 0x96: return "DW_OP_nop"; 193 case 0x97: return "DW_OP_push_object_address"; 194 case 0x98: return "DW_OP_call2"; 195 case 0x99: return "DW_OP_call4"; 196 case 0x9a: return "DW_OP_call_ref"; 197 // case DW_OP_APPLE_array_ref: return "DW_OP_APPLE_array_ref"; 198 // case DW_OP_APPLE_extern: return "DW_OP_APPLE_extern"; 199 case DW_OP_APPLE_uninit: return "DW_OP_APPLE_uninit"; 200 // case DW_OP_APPLE_assign: return "DW_OP_APPLE_assign"; 201 // case DW_OP_APPLE_address_of: return "DW_OP_APPLE_address_of"; 202 // case DW_OP_APPLE_value_of: return "DW_OP_APPLE_value_of"; 203 // case DW_OP_APPLE_deref_type: return "DW_OP_APPLE_deref_type"; 204 // case DW_OP_APPLE_expr_local: return "DW_OP_APPLE_expr_local"; 205 // case DW_OP_APPLE_constf: return "DW_OP_APPLE_constf"; 206 // case DW_OP_APPLE_scalar_cast: return "DW_OP_APPLE_scalar_cast"; 207 // case DW_OP_APPLE_clang_cast: return "DW_OP_APPLE_clang_cast"; 208 // case DW_OP_APPLE_clear: return "DW_OP_APPLE_clear"; 209 // case DW_OP_APPLE_error: return "DW_OP_APPLE_error"; 210 default: 211 snprintf (invalid, sizeof(invalid), "Unknown DW_OP constant: 0x%x", val); 212 return invalid; 213 } 214 } 215 216 217 //---------------------------------------------------------------------- 218 // DWARFExpression constructor 219 //---------------------------------------------------------------------- 220 DWARFExpression::DWARFExpression() : 221 m_data(), 222 m_reg_kind (eRegisterKindDWARF), 223 m_loclist_slide (LLDB_INVALID_ADDRESS) 224 { 225 } 226 227 DWARFExpression::DWARFExpression(const DWARFExpression& rhs) : 228 m_data(rhs.m_data), 229 m_reg_kind (rhs.m_reg_kind), 230 m_loclist_slide(rhs.m_loclist_slide) 231 { 232 } 233 234 235 DWARFExpression::DWARFExpression(const DataExtractor& data, uint32_t data_offset, uint32_t data_length) : 236 m_data(data, data_offset, data_length), 237 m_reg_kind (eRegisterKindDWARF), 238 m_loclist_slide(LLDB_INVALID_ADDRESS) 239 { 240 } 241 242 //---------------------------------------------------------------------- 243 // Destructor 244 //---------------------------------------------------------------------- 245 DWARFExpression::~DWARFExpression() 246 { 247 } 248 249 250 bool 251 DWARFExpression::IsValid() const 252 { 253 return m_data.GetByteSize() > 0; 254 } 255 256 void 257 DWARFExpression::SetOpcodeData (const DataExtractor& data) 258 { 259 m_data = data; 260 } 261 262 void 263 DWARFExpression::SetOpcodeData (const DataExtractor& data, uint32_t data_offset, uint32_t data_length) 264 { 265 m_data.SetData(data, data_offset, data_length); 266 } 267 268 void 269 DWARFExpression::DumpLocation (Stream *s, uint32_t offset, uint32_t length, lldb::DescriptionLevel level, ABI *abi) const 270 { 271 if (!m_data.ValidOffsetForDataOfSize(offset, length)) 272 return; 273 const uint32_t start_offset = offset; 274 const uint32_t end_offset = offset + length; 275 while (m_data.ValidOffset(offset) && offset < end_offset) 276 { 277 const uint32_t op_offset = offset; 278 const uint8_t op = m_data.GetU8(&offset); 279 280 switch (level) 281 { 282 default: 283 break; 284 285 case lldb::eDescriptionLevelBrief: 286 if (offset > start_offset) 287 s->PutChar(' '); 288 break; 289 290 case lldb::eDescriptionLevelFull: 291 case lldb::eDescriptionLevelVerbose: 292 if (offset > start_offset) 293 s->EOL(); 294 s->Indent(); 295 if (level == lldb::eDescriptionLevelFull) 296 break; 297 // Fall through for verbose and print offset and DW_OP prefix.. 298 s->Printf("0x%8.8x: %s", op_offset, op >= DW_OP_APPLE_uninit ? "DW_OP_APPLE_" : "DW_OP_"); 299 break; 300 } 301 302 switch (op) 303 { 304 case DW_OP_addr: *s << "DW_OP_addr(" << m_data.GetAddress(&offset) << ") "; break; // 0x03 1 address 305 case DW_OP_deref: *s << "DW_OP_deref"; break; // 0x06 306 case DW_OP_const1u: s->Printf("DW_OP_const1u(0x%2.2x) ", m_data.GetU8(&offset)); break; // 0x08 1 1-byte constant 307 case DW_OP_const1s: s->Printf("DW_OP_const1s(0x%2.2x) ", m_data.GetU8(&offset)); break; // 0x09 1 1-byte constant 308 case DW_OP_const2u: s->Printf("DW_OP_const2u(0x%4.4x) ", m_data.GetU16(&offset)); break; // 0x0a 1 2-byte constant 309 case DW_OP_const2s: s->Printf("DW_OP_const2s(0x%4.4x) ", m_data.GetU16(&offset)); break; // 0x0b 1 2-byte constant 310 case DW_OP_const4u: s->Printf("DW_OP_const4u(0x%8.8x) ", m_data.GetU32(&offset)); break; // 0x0c 1 4-byte constant 311 case DW_OP_const4s: s->Printf("DW_OP_const4s(0x%8.8x) ", m_data.GetU32(&offset)); break; // 0x0d 1 4-byte constant 312 case DW_OP_const8u: s->Printf("DW_OP_const8u(0x%16.16llx) ", m_data.GetU64(&offset)); break; // 0x0e 1 8-byte constant 313 case DW_OP_const8s: s->Printf("DW_OP_const8s(0x%16.16llx) ", m_data.GetU64(&offset)); break; // 0x0f 1 8-byte constant 314 case DW_OP_constu: s->Printf("DW_OP_constu(0x%llx) ", m_data.GetULEB128(&offset)); break; // 0x10 1 ULEB128 constant 315 case DW_OP_consts: s->Printf("DW_OP_consts(0x%lld) ", m_data.GetSLEB128(&offset)); break; // 0x11 1 SLEB128 constant 316 case DW_OP_dup: s->PutCString("DW_OP_dup"); break; // 0x12 317 case DW_OP_drop: s->PutCString("DW_OP_drop"); break; // 0x13 318 case DW_OP_over: s->PutCString("DW_OP_over"); break; // 0x14 319 case DW_OP_pick: s->Printf("DW_OP_pick(0x%2.2x) ", m_data.GetU8(&offset)); break; // 0x15 1 1-byte stack index 320 case DW_OP_swap: s->PutCString("DW_OP_swap"); break; // 0x16 321 case DW_OP_rot: s->PutCString("DW_OP_rot"); break; // 0x17 322 case DW_OP_xderef: s->PutCString("DW_OP_xderef"); break; // 0x18 323 case DW_OP_abs: s->PutCString("DW_OP_abs"); break; // 0x19 324 case DW_OP_and: s->PutCString("DW_OP_and"); break; // 0x1a 325 case DW_OP_div: s->PutCString("DW_OP_div"); break; // 0x1b 326 case DW_OP_minus: s->PutCString("DW_OP_minus"); break; // 0x1c 327 case DW_OP_mod: s->PutCString("DW_OP_mod"); break; // 0x1d 328 case DW_OP_mul: s->PutCString("DW_OP_mul"); break; // 0x1e 329 case DW_OP_neg: s->PutCString("DW_OP_neg"); break; // 0x1f 330 case DW_OP_not: s->PutCString("DW_OP_not"); break; // 0x20 331 case DW_OP_or: s->PutCString("DW_OP_or"); break; // 0x21 332 case DW_OP_plus: s->PutCString("DW_OP_plus"); break; // 0x22 333 case DW_OP_plus_uconst: // 0x23 1 ULEB128 addend 334 s->Printf("DW_OP_plus_uconst(0x%llx) ", m_data.GetULEB128(&offset)); 335 break; 336 337 case DW_OP_shl: s->PutCString("DW_OP_shl"); break; // 0x24 338 case DW_OP_shr: s->PutCString("DW_OP_shr"); break; // 0x25 339 case DW_OP_shra: s->PutCString("DW_OP_shra"); break; // 0x26 340 case DW_OP_xor: s->PutCString("DW_OP_xor"); break; // 0x27 341 case DW_OP_skip: s->Printf("DW_OP_skip(0x%4.4x)", m_data.GetU16(&offset)); break; // 0x2f 1 signed 2-byte constant 342 case DW_OP_bra: s->Printf("DW_OP_bra(0x%4.4x)", m_data.GetU16(&offset)); break; // 0x28 1 signed 2-byte constant 343 case DW_OP_eq: s->PutCString("DW_OP_eq"); break; // 0x29 344 case DW_OP_ge: s->PutCString("DW_OP_ge"); break; // 0x2a 345 case DW_OP_gt: s->PutCString("DW_OP_gt"); break; // 0x2b 346 case DW_OP_le: s->PutCString("DW_OP_le"); break; // 0x2c 347 case DW_OP_lt: s->PutCString("DW_OP_lt"); break; // 0x2d 348 case DW_OP_ne: s->PutCString("DW_OP_ne"); break; // 0x2e 349 350 case DW_OP_lit0: // 0x30 351 case DW_OP_lit1: // 0x31 352 case DW_OP_lit2: // 0x32 353 case DW_OP_lit3: // 0x33 354 case DW_OP_lit4: // 0x34 355 case DW_OP_lit5: // 0x35 356 case DW_OP_lit6: // 0x36 357 case DW_OP_lit7: // 0x37 358 case DW_OP_lit8: // 0x38 359 case DW_OP_lit9: // 0x39 360 case DW_OP_lit10: // 0x3A 361 case DW_OP_lit11: // 0x3B 362 case DW_OP_lit12: // 0x3C 363 case DW_OP_lit13: // 0x3D 364 case DW_OP_lit14: // 0x3E 365 case DW_OP_lit15: // 0x3F 366 case DW_OP_lit16: // 0x40 367 case DW_OP_lit17: // 0x41 368 case DW_OP_lit18: // 0x42 369 case DW_OP_lit19: // 0x43 370 case DW_OP_lit20: // 0x44 371 case DW_OP_lit21: // 0x45 372 case DW_OP_lit22: // 0x46 373 case DW_OP_lit23: // 0x47 374 case DW_OP_lit24: // 0x48 375 case DW_OP_lit25: // 0x49 376 case DW_OP_lit26: // 0x4A 377 case DW_OP_lit27: // 0x4B 378 case DW_OP_lit28: // 0x4C 379 case DW_OP_lit29: // 0x4D 380 case DW_OP_lit30: // 0x4E 381 case DW_OP_lit31: s->Printf("DW_OP_lit%i", op - DW_OP_lit0); break; // 0x4f 382 383 case DW_OP_reg0: // 0x50 384 case DW_OP_reg1: // 0x51 385 case DW_OP_reg2: // 0x52 386 case DW_OP_reg3: // 0x53 387 case DW_OP_reg4: // 0x54 388 case DW_OP_reg5: // 0x55 389 case DW_OP_reg6: // 0x56 390 case DW_OP_reg7: // 0x57 391 case DW_OP_reg8: // 0x58 392 case DW_OP_reg9: // 0x59 393 case DW_OP_reg10: // 0x5A 394 case DW_OP_reg11: // 0x5B 395 case DW_OP_reg12: // 0x5C 396 case DW_OP_reg13: // 0x5D 397 case DW_OP_reg14: // 0x5E 398 case DW_OP_reg15: // 0x5F 399 case DW_OP_reg16: // 0x60 400 case DW_OP_reg17: // 0x61 401 case DW_OP_reg18: // 0x62 402 case DW_OP_reg19: // 0x63 403 case DW_OP_reg20: // 0x64 404 case DW_OP_reg21: // 0x65 405 case DW_OP_reg22: // 0x66 406 case DW_OP_reg23: // 0x67 407 case DW_OP_reg24: // 0x68 408 case DW_OP_reg25: // 0x69 409 case DW_OP_reg26: // 0x6A 410 case DW_OP_reg27: // 0x6B 411 case DW_OP_reg28: // 0x6C 412 case DW_OP_reg29: // 0x6D 413 case DW_OP_reg30: // 0x6E 414 case DW_OP_reg31: // 0x6F 415 { 416 uint32_t reg_num = op - DW_OP_reg0; 417 if (abi) 418 { 419 RegisterInfo reg_info; 420 if (abi->GetRegisterInfoByKind(m_reg_kind, reg_num, reg_info)) 421 { 422 if (reg_info.name) 423 { 424 s->PutCString (reg_info.name); 425 break; 426 } 427 else if (reg_info.alt_name) 428 { 429 s->PutCString (reg_info.alt_name); 430 break; 431 } 432 } 433 } 434 s->Printf("DW_OP_reg%u", reg_num); break; 435 } 436 break; 437 438 case DW_OP_breg0: 439 case DW_OP_breg1: 440 case DW_OP_breg2: 441 case DW_OP_breg3: 442 case DW_OP_breg4: 443 case DW_OP_breg5: 444 case DW_OP_breg6: 445 case DW_OP_breg7: 446 case DW_OP_breg8: 447 case DW_OP_breg9: 448 case DW_OP_breg10: 449 case DW_OP_breg11: 450 case DW_OP_breg12: 451 case DW_OP_breg13: 452 case DW_OP_breg14: 453 case DW_OP_breg15: 454 case DW_OP_breg16: 455 case DW_OP_breg17: 456 case DW_OP_breg18: 457 case DW_OP_breg19: 458 case DW_OP_breg20: 459 case DW_OP_breg21: 460 case DW_OP_breg22: 461 case DW_OP_breg23: 462 case DW_OP_breg24: 463 case DW_OP_breg25: 464 case DW_OP_breg26: 465 case DW_OP_breg27: 466 case DW_OP_breg28: 467 case DW_OP_breg29: 468 case DW_OP_breg30: 469 case DW_OP_breg31: 470 { 471 uint32_t reg_num = op - DW_OP_breg0; 472 int64_t reg_offset = m_data.GetSLEB128(&offset); 473 if (abi) 474 { 475 RegisterInfo reg_info; 476 if (abi->GetRegisterInfoByKind(m_reg_kind, reg_num, reg_info)) 477 { 478 if (reg_info.name) 479 { 480 s->Printf("[%s%+lli]", reg_info.name, reg_offset); 481 break; 482 } 483 else if (reg_info.alt_name) 484 { 485 s->Printf("[%s%+lli]", reg_info.alt_name, reg_offset); 486 break; 487 } 488 } 489 } 490 s->Printf("DW_OP_breg%i(0x%llx)", reg_num, reg_offset); 491 } 492 break; 493 494 case DW_OP_regx: // 0x90 1 ULEB128 register 495 { 496 uint64_t reg_num = m_data.GetULEB128(&offset); 497 if (abi) 498 { 499 RegisterInfo reg_info; 500 if (abi->GetRegisterInfoByKind(m_reg_kind, reg_num, reg_info)) 501 { 502 if (reg_info.name) 503 { 504 s->PutCString (reg_info.name); 505 break; 506 } 507 else if (reg_info.alt_name) 508 { 509 s->PutCString (reg_info.alt_name); 510 break; 511 } 512 } 513 } 514 s->Printf("DW_OP_regx(%llu)", reg_num); break; 515 } 516 break; 517 case DW_OP_fbreg: // 0x91 1 SLEB128 offset 518 s->Printf("DW_OP_fbreg(%lli)",m_data.GetSLEB128(&offset)); 519 break; 520 case DW_OP_bregx: // 0x92 2 ULEB128 register followed by SLEB128 offset 521 { 522 uint32_t reg_num = m_data.GetULEB128(&offset); 523 int64_t reg_offset = m_data.GetSLEB128(&offset); 524 if (abi) 525 { 526 RegisterInfo reg_info; 527 if (abi->GetRegisterInfoByKind(m_reg_kind, reg_num, reg_info)) 528 { 529 if (reg_info.name) 530 { 531 s->Printf("[%s%+lli]", reg_info.name, reg_offset); 532 break; 533 } 534 else if (reg_info.alt_name) 535 { 536 s->Printf("[%s%+lli]", reg_info.alt_name, reg_offset); 537 break; 538 } 539 } 540 } 541 s->Printf("DW_OP_bregx(reg=%u,offset=%lli)", reg_num, reg_offset); 542 } 543 break; 544 case DW_OP_piece: // 0x93 1 ULEB128 size of piece addressed 545 s->Printf("DW_OP_piece(0x%llx)", m_data.GetULEB128(&offset)); 546 break; 547 case DW_OP_deref_size: // 0x94 1 1-byte size of data retrieved 548 s->Printf("DW_OP_deref_size(0x%2.2x)", m_data.GetU8(&offset)); 549 break; 550 case DW_OP_xderef_size: // 0x95 1 1-byte size of data retrieved 551 s->Printf("DW_OP_xderef_size(0x%2.2x)", m_data.GetU8(&offset)); 552 break; 553 case DW_OP_nop: s->PutCString("DW_OP_nop"); break; // 0x96 554 case DW_OP_push_object_address: s->PutCString("DW_OP_push_object_address"); break; // 0x97 DWARF3 555 case DW_OP_call2: // 0x98 DWARF3 1 2-byte offset of DIE 556 s->Printf("DW_OP_call2(0x%4.4x)", m_data.GetU16(&offset)); 557 break; 558 case DW_OP_call4: // 0x99 DWARF3 1 4-byte offset of DIE 559 s->Printf("DW_OP_call4(0x%8.8x)", m_data.GetU32(&offset)); 560 break; 561 case DW_OP_call_ref: // 0x9a DWARF3 1 4- or 8-byte offset of DIE 562 s->Printf("DW_OP_call_ref(0x%8.8llx)", m_data.GetAddress(&offset)); 563 break; 564 // case DW_OP_form_tls_address: s << "form_tls_address"; break; // 0x9b DWARF3 565 // case DW_OP_call_frame_cfa: s << "call_frame_cfa"; break; // 0x9c DWARF3 566 // case DW_OP_bit_piece: // 0x9d DWARF3 2 567 // s->Printf("DW_OP_bit_piece(0x%x, 0x%x)", m_data.GetULEB128(&offset), m_data.GetULEB128(&offset)); 568 // break; 569 // case DW_OP_lo_user: s->PutCString("DW_OP_lo_user"); break; // 0xe0 570 // case DW_OP_hi_user: s->PutCString("DW_OP_hi_user"); break; // 0xff 571 // case DW_OP_APPLE_extern: 572 // s->Printf("DW_OP_APPLE_extern(%llu)", m_data.GetULEB128(&offset)); 573 // break; 574 // case DW_OP_APPLE_array_ref: 575 // s->PutCString("DW_OP_APPLE_array_ref"); 576 // break; 577 case DW_OP_APPLE_uninit: 578 s->PutCString("DW_OP_APPLE_uninit"); // 0xF0 579 break; 580 // case DW_OP_APPLE_assign: // 0xF1 - pops value off and assigns it to second item on stack (2nd item must have assignable context) 581 // s->PutCString("DW_OP_APPLE_assign"); 582 // break; 583 // case DW_OP_APPLE_address_of: // 0xF2 - gets the address of the top stack item (top item must be a variable, or have value_type that is an address already) 584 // s->PutCString("DW_OP_APPLE_address_of"); 585 // break; 586 // case DW_OP_APPLE_value_of: // 0xF3 - pops the value off the stack and pushes the value of that object (top item must be a variable, or expression local) 587 // s->PutCString("DW_OP_APPLE_value_of"); 588 // break; 589 // case DW_OP_APPLE_deref_type: // 0xF4 - gets the address of the top stack item (top item must be a variable, or a clang type) 590 // s->PutCString("DW_OP_APPLE_deref_type"); 591 // break; 592 // case DW_OP_APPLE_expr_local: // 0xF5 - ULEB128 expression local index 593 // s->Printf("DW_OP_APPLE_expr_local(%llu)", m_data.GetULEB128(&offset)); 594 // break; 595 // case DW_OP_APPLE_constf: // 0xF6 - 1 byte float size, followed by constant float data 596 // { 597 // uint8_t float_length = m_data.GetU8(&offset); 598 // s->Printf("DW_OP_APPLE_constf(<%u> ", float_length); 599 // m_data.Dump(s, offset, eFormatHex, float_length, 1, UINT32_MAX, DW_INVALID_ADDRESS, 0, 0); 600 // s->PutChar(')'); 601 // // Consume the float data 602 // m_data.GetData(&offset, float_length); 603 // } 604 // break; 605 // case DW_OP_APPLE_scalar_cast: 606 // s->Printf("DW_OP_APPLE_scalar_cast(%s)", Scalar::GetValueTypeAsCString ((Scalar::Type)m_data.GetU8(&offset))); 607 // break; 608 // case DW_OP_APPLE_clang_cast: 609 // { 610 // clang::Type *clang_type = (clang::Type *)m_data.GetMaxU64(&offset, sizeof(void*)); 611 // s->Printf("DW_OP_APPLE_clang_cast(%p)", clang_type); 612 // } 613 // break; 614 // case DW_OP_APPLE_clear: 615 // s->PutCString("DW_OP_APPLE_clear"); 616 // break; 617 // case DW_OP_APPLE_error: // 0xFF - Stops expression evaluation and returns an error (no args) 618 // s->PutCString("DW_OP_APPLE_error"); 619 // break; 620 } 621 } 622 } 623 624 void 625 DWARFExpression::SetLocationListSlide (addr_t slide) 626 { 627 m_loclist_slide = slide; 628 } 629 630 int 631 DWARFExpression::GetRegisterKind () 632 { 633 return m_reg_kind; 634 } 635 636 void 637 DWARFExpression::SetRegisterKind (RegisterKind reg_kind) 638 { 639 m_reg_kind = reg_kind; 640 } 641 642 bool 643 DWARFExpression::IsLocationList() const 644 { 645 return m_loclist_slide != LLDB_INVALID_ADDRESS; 646 } 647 648 void 649 DWARFExpression::GetDescription (Stream *s, lldb::DescriptionLevel level, addr_t location_list_base_addr, ABI *abi) const 650 { 651 if (IsLocationList()) 652 { 653 // We have a location list 654 uint32_t offset = 0; 655 uint32_t count = 0; 656 addr_t curr_base_addr = location_list_base_addr; 657 while (m_data.ValidOffset(offset)) 658 { 659 lldb::addr_t begin_addr_offset = m_data.GetAddress(&offset); 660 lldb::addr_t end_addr_offset = m_data.GetAddress(&offset); 661 if (begin_addr_offset < end_addr_offset) 662 { 663 if (count > 0) 664 s->PutCString(", "); 665 VMRange addr_range(curr_base_addr + begin_addr_offset, curr_base_addr + end_addr_offset); 666 addr_range.Dump(s, 0, 8); 667 s->PutChar('{'); 668 uint32_t location_length = m_data.GetU16(&offset); 669 DumpLocation (s, offset, location_length, level, abi); 670 s->PutChar('}'); 671 offset += location_length; 672 } 673 else if (begin_addr_offset == 0 && end_addr_offset == 0) 674 { 675 // The end of the location list is marked by both the start and end offset being zero 676 break; 677 } 678 else 679 { 680 if ((m_data.GetAddressByteSize() == 4 && (begin_addr_offset == UINT32_MAX)) || 681 (m_data.GetAddressByteSize() == 8 && (begin_addr_offset == UINT64_MAX))) 682 { 683 curr_base_addr = end_addr_offset + location_list_base_addr; 684 // We have a new base address 685 if (count > 0) 686 s->PutCString(", "); 687 *s << "base_addr = " << end_addr_offset; 688 } 689 } 690 691 count++; 692 } 693 } 694 else 695 { 696 // We have a normal location that contains DW_OP location opcodes 697 DumpLocation (s, 0, m_data.GetByteSize(), level, abi); 698 } 699 } 700 701 static bool 702 ReadRegisterValueAsScalar 703 ( 704 RegisterContext *reg_ctx, 705 uint32_t reg_kind, 706 uint32_t reg_num, 707 Error *error_ptr, 708 Value &value 709 ) 710 { 711 if (reg_ctx == NULL) 712 { 713 if (error_ptr) 714 error_ptr->SetErrorStringWithFormat("No register context in frame.\n"); 715 } 716 else 717 { 718 uint32_t native_reg = reg_ctx->ConvertRegisterKindToRegisterNumber(reg_kind, reg_num); 719 if (native_reg == LLDB_INVALID_REGNUM) 720 { 721 if (error_ptr) 722 error_ptr->SetErrorStringWithFormat("Unable to convert register kind=%u reg_num=%u to a native register number.\n", reg_kind, reg_num); 723 } 724 else 725 { 726 const RegisterInfo *reg_info = reg_ctx->GetRegisterInfoAtIndex(native_reg); 727 RegisterValue reg_value; 728 if (reg_ctx->ReadRegister (reg_info, reg_value)) 729 { 730 if (reg_value.GetScalarValue(value.GetScalar())) 731 { 732 value.SetValueType (Value::eValueTypeScalar); 733 value.SetContext (Value::eContextTypeRegisterInfo, 734 const_cast<RegisterInfo *>(reg_info)); 735 if (error_ptr) 736 error_ptr->Clear(); 737 return true; 738 } 739 else 740 { 741 // If we get this error, then we need to implement a value 742 // buffer in the dwarf expression evaluation function... 743 if (error_ptr) 744 error_ptr->SetErrorStringWithFormat ("register %s can't be converted to a scalar value", 745 reg_info->name); 746 } 747 } 748 else 749 { 750 if (error_ptr) 751 error_ptr->SetErrorStringWithFormat("register %s is not available", reg_info->name); 752 } 753 } 754 } 755 return false; 756 } 757 758 //bool 759 //DWARFExpression::LocationListContainsLoadAddress (Process* process, const Address &addr) const 760 //{ 761 // return LocationListContainsLoadAddress(process, addr.GetLoadAddress(process)); 762 //} 763 // 764 //bool 765 //DWARFExpression::LocationListContainsLoadAddress (Process* process, addr_t load_addr) const 766 //{ 767 // if (load_addr == LLDB_INVALID_ADDRESS) 768 // return false; 769 // 770 // if (IsLocationList()) 771 // { 772 // uint32_t offset = 0; 773 // 774 // addr_t loc_list_base_addr = m_loclist_slide.GetLoadAddress(process); 775 // 776 // if (loc_list_base_addr == LLDB_INVALID_ADDRESS) 777 // return false; 778 // 779 // while (m_data.ValidOffset(offset)) 780 // { 781 // // We need to figure out what the value is for the location. 782 // addr_t lo_pc = m_data.GetAddress(&offset); 783 // addr_t hi_pc = m_data.GetAddress(&offset); 784 // if (lo_pc == 0 && hi_pc == 0) 785 // break; 786 // else 787 // { 788 // lo_pc += loc_list_base_addr; 789 // hi_pc += loc_list_base_addr; 790 // 791 // if (lo_pc <= load_addr && load_addr < hi_pc) 792 // return true; 793 // 794 // offset += m_data.GetU16(&offset); 795 // } 796 // } 797 // } 798 // return false; 799 //} 800 801 static uint32_t 802 GetOpcodeDataSize (const DataExtractor &data, const uint32_t data_offset, const uint8_t op) 803 { 804 uint32_t offset = data_offset; 805 switch (op) 806 { 807 case DW_OP_addr: 808 case DW_OP_call_ref: // 0x9a 1 address sized offset of DIE (DWARF3) 809 return data.GetAddressByteSize(); 810 811 // Opcodes with no arguments 812 case DW_OP_deref: // 0x06 813 case DW_OP_dup: // 0x12 814 case DW_OP_drop: // 0x13 815 case DW_OP_over: // 0x14 816 case DW_OP_swap: // 0x16 817 case DW_OP_rot: // 0x17 818 case DW_OP_xderef: // 0x18 819 case DW_OP_abs: // 0x19 820 case DW_OP_and: // 0x1a 821 case DW_OP_div: // 0x1b 822 case DW_OP_minus: // 0x1c 823 case DW_OP_mod: // 0x1d 824 case DW_OP_mul: // 0x1e 825 case DW_OP_neg: // 0x1f 826 case DW_OP_not: // 0x20 827 case DW_OP_or: // 0x21 828 case DW_OP_plus: // 0x22 829 case DW_OP_shl: // 0x24 830 case DW_OP_shr: // 0x25 831 case DW_OP_shra: // 0x26 832 case DW_OP_xor: // 0x27 833 case DW_OP_eq: // 0x29 834 case DW_OP_ge: // 0x2a 835 case DW_OP_gt: // 0x2b 836 case DW_OP_le: // 0x2c 837 case DW_OP_lt: // 0x2d 838 case DW_OP_ne: // 0x2e 839 case DW_OP_lit0: // 0x30 840 case DW_OP_lit1: // 0x31 841 case DW_OP_lit2: // 0x32 842 case DW_OP_lit3: // 0x33 843 case DW_OP_lit4: // 0x34 844 case DW_OP_lit5: // 0x35 845 case DW_OP_lit6: // 0x36 846 case DW_OP_lit7: // 0x37 847 case DW_OP_lit8: // 0x38 848 case DW_OP_lit9: // 0x39 849 case DW_OP_lit10: // 0x3A 850 case DW_OP_lit11: // 0x3B 851 case DW_OP_lit12: // 0x3C 852 case DW_OP_lit13: // 0x3D 853 case DW_OP_lit14: // 0x3E 854 case DW_OP_lit15: // 0x3F 855 case DW_OP_lit16: // 0x40 856 case DW_OP_lit17: // 0x41 857 case DW_OP_lit18: // 0x42 858 case DW_OP_lit19: // 0x43 859 case DW_OP_lit20: // 0x44 860 case DW_OP_lit21: // 0x45 861 case DW_OP_lit22: // 0x46 862 case DW_OP_lit23: // 0x47 863 case DW_OP_lit24: // 0x48 864 case DW_OP_lit25: // 0x49 865 case DW_OP_lit26: // 0x4A 866 case DW_OP_lit27: // 0x4B 867 case DW_OP_lit28: // 0x4C 868 case DW_OP_lit29: // 0x4D 869 case DW_OP_lit30: // 0x4E 870 case DW_OP_lit31: // 0x4f 871 case DW_OP_reg0: // 0x50 872 case DW_OP_reg1: // 0x51 873 case DW_OP_reg2: // 0x52 874 case DW_OP_reg3: // 0x53 875 case DW_OP_reg4: // 0x54 876 case DW_OP_reg5: // 0x55 877 case DW_OP_reg6: // 0x56 878 case DW_OP_reg7: // 0x57 879 case DW_OP_reg8: // 0x58 880 case DW_OP_reg9: // 0x59 881 case DW_OP_reg10: // 0x5A 882 case DW_OP_reg11: // 0x5B 883 case DW_OP_reg12: // 0x5C 884 case DW_OP_reg13: // 0x5D 885 case DW_OP_reg14: // 0x5E 886 case DW_OP_reg15: // 0x5F 887 case DW_OP_reg16: // 0x60 888 case DW_OP_reg17: // 0x61 889 case DW_OP_reg18: // 0x62 890 case DW_OP_reg19: // 0x63 891 case DW_OP_reg20: // 0x64 892 case DW_OP_reg21: // 0x65 893 case DW_OP_reg22: // 0x66 894 case DW_OP_reg23: // 0x67 895 case DW_OP_reg24: // 0x68 896 case DW_OP_reg25: // 0x69 897 case DW_OP_reg26: // 0x6A 898 case DW_OP_reg27: // 0x6B 899 case DW_OP_reg28: // 0x6C 900 case DW_OP_reg29: // 0x6D 901 case DW_OP_reg30: // 0x6E 902 case DW_OP_reg31: // 0x6F 903 case DW_OP_nop: // 0x96 904 case DW_OP_push_object_address: // 0x97 DWARF3 905 case DW_OP_form_tls_address: // 0x9b DWARF3 906 case DW_OP_call_frame_cfa: // 0x9c DWARF3 907 return 0; 908 909 // Opcodes with a single 1 byte arguments 910 case DW_OP_const1u: // 0x08 1 1-byte constant 911 case DW_OP_const1s: // 0x09 1 1-byte constant 912 case DW_OP_pick: // 0x15 1 1-byte stack index 913 case DW_OP_deref_size: // 0x94 1 1-byte size of data retrieved 914 case DW_OP_xderef_size: // 0x95 1 1-byte size of data retrieved 915 return 1; 916 917 // Opcodes with a single 2 byte arguments 918 case DW_OP_const2u: // 0x0a 1 2-byte constant 919 case DW_OP_const2s: // 0x0b 1 2-byte constant 920 case DW_OP_skip: // 0x2f 1 signed 2-byte constant 921 case DW_OP_bra: // 0x28 1 signed 2-byte constant 922 case DW_OP_call2: // 0x98 1 2-byte offset of DIE (DWARF3) 923 return 2; 924 925 // Opcodes with a single 4 byte arguments 926 case DW_OP_const4u: // 0x0c 1 4-byte constant 927 case DW_OP_const4s: // 0x0d 1 4-byte constant 928 case DW_OP_call4: // 0x99 1 4-byte offset of DIE (DWARF3) 929 return 4; 930 931 // Opcodes with a single 8 byte arguments 932 case DW_OP_const8u: // 0x0e 1 8-byte constant 933 case DW_OP_const8s: // 0x0f 1 8-byte constant 934 return 8; 935 936 // All opcodes that have a single ULEB (signed or unsigned) argument 937 case DW_OP_constu: // 0x10 1 ULEB128 constant 938 case DW_OP_consts: // 0x11 1 SLEB128 constant 939 case DW_OP_plus_uconst: // 0x23 1 ULEB128 addend 940 case DW_OP_breg0: // 0x70 1 ULEB128 register 941 case DW_OP_breg1: // 0x71 1 ULEB128 register 942 case DW_OP_breg2: // 0x72 1 ULEB128 register 943 case DW_OP_breg3: // 0x73 1 ULEB128 register 944 case DW_OP_breg4: // 0x74 1 ULEB128 register 945 case DW_OP_breg5: // 0x75 1 ULEB128 register 946 case DW_OP_breg6: // 0x76 1 ULEB128 register 947 case DW_OP_breg7: // 0x77 1 ULEB128 register 948 case DW_OP_breg8: // 0x78 1 ULEB128 register 949 case DW_OP_breg9: // 0x79 1 ULEB128 register 950 case DW_OP_breg10: // 0x7a 1 ULEB128 register 951 case DW_OP_breg11: // 0x7b 1 ULEB128 register 952 case DW_OP_breg12: // 0x7c 1 ULEB128 register 953 case DW_OP_breg13: // 0x7d 1 ULEB128 register 954 case DW_OP_breg14: // 0x7e 1 ULEB128 register 955 case DW_OP_breg15: // 0x7f 1 ULEB128 register 956 case DW_OP_breg16: // 0x80 1 ULEB128 register 957 case DW_OP_breg17: // 0x81 1 ULEB128 register 958 case DW_OP_breg18: // 0x82 1 ULEB128 register 959 case DW_OP_breg19: // 0x83 1 ULEB128 register 960 case DW_OP_breg20: // 0x84 1 ULEB128 register 961 case DW_OP_breg21: // 0x85 1 ULEB128 register 962 case DW_OP_breg22: // 0x86 1 ULEB128 register 963 case DW_OP_breg23: // 0x87 1 ULEB128 register 964 case DW_OP_breg24: // 0x88 1 ULEB128 register 965 case DW_OP_breg25: // 0x89 1 ULEB128 register 966 case DW_OP_breg26: // 0x8a 1 ULEB128 register 967 case DW_OP_breg27: // 0x8b 1 ULEB128 register 968 case DW_OP_breg28: // 0x8c 1 ULEB128 register 969 case DW_OP_breg29: // 0x8d 1 ULEB128 register 970 case DW_OP_breg30: // 0x8e 1 ULEB128 register 971 case DW_OP_breg31: // 0x8f 1 ULEB128 register 972 case DW_OP_regx: // 0x90 1 ULEB128 register 973 case DW_OP_fbreg: // 0x91 1 SLEB128 offset 974 case DW_OP_piece: // 0x93 1 ULEB128 size of piece addressed 975 data.Skip_LEB128(&offset); 976 return offset - data_offset; 977 978 // All opcodes that have a 2 ULEB (signed or unsigned) arguments 979 case DW_OP_bregx: // 0x92 2 ULEB128 register followed by SLEB128 offset 980 case DW_OP_bit_piece: // 0x9d ULEB128 bit size, ULEB128 bit offset (DWARF3); 981 data.Skip_LEB128(&offset); 982 data.Skip_LEB128(&offset); 983 return offset - data_offset; 984 default: 985 assert (!"Unhandled DW_OP_XXX opcode, add support for it"); 986 break; 987 } 988 return UINT32_MAX; 989 } 990 991 bool 992 DWARFExpression::LocationContains_DW_OP_addr (lldb::addr_t file_addr) const 993 { 994 if (IsLocationList()) 995 return false; 996 uint32_t offset = 0; 997 while (m_data.ValidOffset(offset)) 998 { 999 const uint8_t op = m_data.GetU8(&offset); 1000 1001 if (op == DW_OP_addr) 1002 { 1003 if (file_addr == LLDB_INVALID_ADDRESS) 1004 return true; 1005 addr_t op_file_addr = m_data.GetAddress(&offset); 1006 if (op_file_addr == file_addr) 1007 return true; 1008 } 1009 else 1010 { 1011 const uint32_t op_arg_size = GetOpcodeDataSize (m_data, offset, op); 1012 if (op_arg_size == UINT32_MAX) 1013 break; 1014 offset += op_arg_size; 1015 } 1016 } 1017 return false; 1018 } 1019 1020 bool 1021 DWARFExpression::Update_DW_OP_addr (lldb::addr_t file_addr) 1022 { 1023 if (IsLocationList()) 1024 return false; 1025 uint32_t offset = 0; 1026 while (m_data.ValidOffset(offset)) 1027 { 1028 const uint8_t op = m_data.GetU8(&offset); 1029 1030 if (op == DW_OP_addr) 1031 { 1032 const uint8_t addr_byte_size = m_data.GetAddressByteSize(); 1033 // We have to make a copy of the data as we don't know if this 1034 // data is from a read only memory mapped buffer, so we duplicate 1035 // all of the data first, then modify it, and if all goes well, 1036 // we then replace the data for this expression 1037 1038 // So first we copy the data into a heap buffer 1039 std::auto_ptr<DataBufferHeap> head_data_ap (new DataBufferHeap (m_data.GetDataStart(), 1040 m_data.GetByteSize())); 1041 1042 // Make en encoder so we can write the address into the buffer using 1043 // the correct byte order (endianness) 1044 DataEncoder encoder (head_data_ap->GetBytes(), 1045 head_data_ap->GetByteSize(), 1046 m_data.GetByteOrder(), 1047 addr_byte_size); 1048 1049 // Replace the address in the new buffer 1050 if (encoder.PutMaxU64 (offset, addr_byte_size, file_addr) == UINT32_MAX) 1051 return false; 1052 1053 // All went well, so now we can reset the data using a shared 1054 // pointer to the heap data so "m_data" will now correctly 1055 // manage the heap data. 1056 m_data.SetData (DataBufferSP (head_data_ap.release())); 1057 return true; 1058 } 1059 else 1060 { 1061 const uint32_t op_arg_size = GetOpcodeDataSize (m_data, offset, op); 1062 if (op_arg_size == UINT32_MAX) 1063 break; 1064 offset += op_arg_size; 1065 } 1066 } 1067 return false; 1068 } 1069 1070 bool 1071 DWARFExpression::LocationListContainsAddress (lldb::addr_t loclist_base_addr, lldb::addr_t addr) const 1072 { 1073 if (addr == LLDB_INVALID_ADDRESS) 1074 return false; 1075 1076 if (IsLocationList()) 1077 { 1078 uint32_t offset = 0; 1079 1080 if (loclist_base_addr == LLDB_INVALID_ADDRESS) 1081 return false; 1082 1083 while (m_data.ValidOffset(offset)) 1084 { 1085 // We need to figure out what the value is for the location. 1086 addr_t lo_pc = m_data.GetAddress(&offset); 1087 addr_t hi_pc = m_data.GetAddress(&offset); 1088 if (lo_pc == 0 && hi_pc == 0) 1089 break; 1090 else 1091 { 1092 lo_pc += loclist_base_addr - m_loclist_slide; 1093 hi_pc += loclist_base_addr - m_loclist_slide; 1094 1095 if (lo_pc <= addr && addr < hi_pc) 1096 return true; 1097 1098 offset += m_data.GetU16(&offset); 1099 } 1100 } 1101 } 1102 return false; 1103 } 1104 1105 bool 1106 DWARFExpression::GetLocation (addr_t base_addr, addr_t pc, uint32_t &offset, uint32_t &length) 1107 { 1108 offset = 0; 1109 if (!IsLocationList()) 1110 { 1111 length = m_data.GetByteSize(); 1112 return true; 1113 } 1114 1115 if (base_addr != LLDB_INVALID_ADDRESS && pc != LLDB_INVALID_ADDRESS) 1116 { 1117 addr_t curr_base_addr = base_addr; 1118 1119 while (m_data.ValidOffset(offset)) 1120 { 1121 // We need to figure out what the value is for the location. 1122 addr_t lo_pc = m_data.GetAddress(&offset); 1123 addr_t hi_pc = m_data.GetAddress(&offset); 1124 if (lo_pc == 0 && hi_pc == 0) 1125 { 1126 break; 1127 } 1128 else 1129 { 1130 lo_pc += curr_base_addr - m_loclist_slide; 1131 hi_pc += curr_base_addr - m_loclist_slide; 1132 1133 length = m_data.GetU16(&offset); 1134 1135 if (length > 0 && lo_pc <= pc && pc < hi_pc) 1136 return true; 1137 1138 offset += length; 1139 } 1140 } 1141 } 1142 offset = UINT32_MAX; 1143 length = 0; 1144 return false; 1145 } 1146 1147 bool 1148 DWARFExpression::DumpLocationForAddress (Stream *s, 1149 lldb::DescriptionLevel level, 1150 addr_t base_addr, 1151 addr_t address, 1152 ABI *abi) 1153 { 1154 uint32_t offset = 0; 1155 uint32_t length = 0; 1156 1157 if (GetLocation (base_addr, address, offset, length)) 1158 { 1159 if (length > 0) 1160 { 1161 DumpLocation(s, offset, length, level, abi); 1162 return true; 1163 } 1164 } 1165 return false; 1166 } 1167 1168 bool 1169 DWARFExpression::Evaluate 1170 ( 1171 ExecutionContextScope *exe_scope, 1172 clang::ASTContext *ast_context, 1173 ClangExpressionVariableList *expr_locals, 1174 ClangExpressionDeclMap *decl_map, 1175 lldb::addr_t loclist_base_load_addr, 1176 const Value* initial_value_ptr, 1177 Value& result, 1178 Error *error_ptr 1179 ) const 1180 { 1181 ExecutionContext exe_ctx (exe_scope); 1182 return Evaluate(&exe_ctx, ast_context, expr_locals, decl_map, NULL, loclist_base_load_addr, initial_value_ptr, result, error_ptr); 1183 } 1184 1185 bool 1186 DWARFExpression::Evaluate 1187 ( 1188 ExecutionContext *exe_ctx, 1189 clang::ASTContext *ast_context, 1190 ClangExpressionVariableList *expr_locals, 1191 ClangExpressionDeclMap *decl_map, 1192 RegisterContext *reg_ctx, 1193 lldb::addr_t loclist_base_load_addr, 1194 const Value* initial_value_ptr, 1195 Value& result, 1196 Error *error_ptr 1197 ) const 1198 { 1199 if (IsLocationList()) 1200 { 1201 uint32_t offset = 0; 1202 addr_t pc; 1203 StackFrame *frame = NULL; 1204 if (reg_ctx) 1205 pc = reg_ctx->GetPC(); 1206 else 1207 { 1208 frame = exe_ctx->GetFramePtr(); 1209 pc = frame->GetRegisterContext()->GetPC(); 1210 } 1211 1212 if (loclist_base_load_addr != LLDB_INVALID_ADDRESS) 1213 { 1214 if (pc == LLDB_INVALID_ADDRESS) 1215 { 1216 if (error_ptr) 1217 error_ptr->SetErrorString("Invalid PC in frame."); 1218 return false; 1219 } 1220 1221 addr_t curr_loclist_base_load_addr = loclist_base_load_addr; 1222 1223 while (m_data.ValidOffset(offset)) 1224 { 1225 // We need to figure out what the value is for the location. 1226 addr_t lo_pc = m_data.GetAddress(&offset); 1227 addr_t hi_pc = m_data.GetAddress(&offset); 1228 if (lo_pc == 0 && hi_pc == 0) 1229 { 1230 break; 1231 } 1232 else 1233 { 1234 lo_pc += curr_loclist_base_load_addr - m_loclist_slide; 1235 hi_pc += curr_loclist_base_load_addr - m_loclist_slide; 1236 1237 uint16_t length = m_data.GetU16(&offset); 1238 1239 if (length > 0 && lo_pc <= pc && pc < hi_pc) 1240 { 1241 return DWARFExpression::Evaluate (exe_ctx, ast_context, expr_locals, decl_map, reg_ctx, m_data, offset, length, m_reg_kind, initial_value_ptr, result, error_ptr); 1242 } 1243 offset += length; 1244 } 1245 } 1246 } 1247 if (error_ptr) 1248 error_ptr->SetErrorString ("variable not available"); 1249 return false; 1250 } 1251 1252 // Not a location list, just a single expression. 1253 return DWARFExpression::Evaluate (exe_ctx, ast_context, expr_locals, decl_map, reg_ctx, m_data, 0, m_data.GetByteSize(), m_reg_kind, initial_value_ptr, result, error_ptr); 1254 } 1255 1256 1257 1258 bool 1259 DWARFExpression::Evaluate 1260 ( 1261 ExecutionContext *exe_ctx, 1262 clang::ASTContext *ast_context, 1263 ClangExpressionVariableList *expr_locals, 1264 ClangExpressionDeclMap *decl_map, 1265 RegisterContext *reg_ctx, 1266 const DataExtractor& opcodes, 1267 const uint32_t opcodes_offset, 1268 const uint32_t opcodes_length, 1269 const uint32_t reg_kind, 1270 const Value* initial_value_ptr, 1271 Value& result, 1272 Error *error_ptr 1273 ) 1274 { 1275 std::vector<Value> stack; 1276 1277 Process *process = NULL; 1278 StackFrame *frame = NULL; 1279 1280 if (exe_ctx) 1281 { 1282 process = exe_ctx->GetProcessPtr(); 1283 frame = exe_ctx->GetFramePtr(); 1284 } 1285 if (reg_ctx == NULL && frame) 1286 reg_ctx = frame->GetRegisterContext().get(); 1287 1288 if (initial_value_ptr) 1289 stack.push_back(*initial_value_ptr); 1290 1291 uint32_t offset = opcodes_offset; 1292 const uint32_t end_offset = opcodes_offset + opcodes_length; 1293 Value tmp; 1294 uint32_t reg_num; 1295 1296 // Make sure all of the data is available in opcodes. 1297 if (!opcodes.ValidOffsetForDataOfSize(opcodes_offset, opcodes_length)) 1298 { 1299 if (error_ptr) 1300 error_ptr->SetErrorString ("Invalid offset and/or length for opcodes buffer."); 1301 return false; 1302 } 1303 LogSP log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS)); 1304 1305 1306 while (opcodes.ValidOffset(offset) && offset < end_offset) 1307 { 1308 const uint32_t op_offset = offset; 1309 const uint8_t op = opcodes.GetU8(&offset); 1310 1311 if (log && log->GetVerbose()) 1312 { 1313 size_t count = stack.size(); 1314 log->Printf("Stack before operation has %lu values:", count); 1315 for (size_t i=0; i<count; ++i) 1316 { 1317 StreamString new_value; 1318 new_value.Printf("[%zu]", i); 1319 stack[i].Dump(&new_value); 1320 log->Printf(" %s", new_value.GetData()); 1321 } 1322 log->Printf("0x%8.8x: %s", op_offset, DW_OP_value_to_name(op)); 1323 } 1324 switch (op) 1325 { 1326 //---------------------------------------------------------------------- 1327 // The DW_OP_addr operation has a single operand that encodes a machine 1328 // address and whose size is the size of an address on the target machine. 1329 //---------------------------------------------------------------------- 1330 case DW_OP_addr: 1331 stack.push_back(Scalar(opcodes.GetAddress(&offset))); 1332 stack.back().SetValueType (Value::eValueTypeFileAddress); 1333 break; 1334 1335 //---------------------------------------------------------------------- 1336 // The DW_OP_addr_sect_offset4 is used for any location expressions in 1337 // shared libraries that have a location like: 1338 // DW_OP_addr(0x1000) 1339 // If this address resides in a shared library, then this virtual 1340 // address won't make sense when it is evaluated in the context of a 1341 // running process where shared libraries have been slid. To account for 1342 // this, this new address type where we can store the section pointer 1343 // and a 4 byte offset. 1344 //---------------------------------------------------------------------- 1345 // case DW_OP_addr_sect_offset4: 1346 // { 1347 // result_type = eResultTypeFileAddress; 1348 // lldb::Section *sect = (lldb::Section *)opcodes.GetMaxU64(&offset, sizeof(void *)); 1349 // lldb::addr_t sect_offset = opcodes.GetU32(&offset); 1350 // 1351 // Address so_addr (sect, sect_offset); 1352 // lldb::addr_t load_addr = so_addr.GetLoadAddress(); 1353 // if (load_addr != LLDB_INVALID_ADDRESS) 1354 // { 1355 // // We successfully resolve a file address to a load 1356 // // address. 1357 // stack.push_back(load_addr); 1358 // break; 1359 // } 1360 // else 1361 // { 1362 // // We were able 1363 // if (error_ptr) 1364 // error_ptr->SetErrorStringWithFormat ("Section %s in %s is not currently loaded.\n", sect->GetName().AsCString(), sect->GetModule()->GetFileSpec().GetFilename().AsCString()); 1365 // return false; 1366 // } 1367 // } 1368 // break; 1369 1370 //---------------------------------------------------------------------- 1371 // OPCODE: DW_OP_deref 1372 // OPERANDS: none 1373 // DESCRIPTION: Pops the top stack entry and treats it as an address. 1374 // The value retrieved from that address is pushed. The size of the 1375 // data retrieved from the dereferenced address is the size of an 1376 // address on the target machine. 1377 //---------------------------------------------------------------------- 1378 case DW_OP_deref: 1379 { 1380 Value::ValueType value_type = stack.back().GetValueType(); 1381 switch (value_type) 1382 { 1383 case Value::eValueTypeHostAddress: 1384 { 1385 void *src = (void *)stack.back().GetScalar().ULongLong(); 1386 intptr_t ptr; 1387 ::memcpy (&ptr, src, sizeof(void *)); 1388 stack.back().GetScalar() = ptr; 1389 stack.back().ClearContext(); 1390 } 1391 break; 1392 case Value::eValueTypeLoadAddress: 1393 if (exe_ctx) 1394 { 1395 if (process) 1396 { 1397 lldb::addr_t pointer_addr = stack.back().GetScalar().ULongLong(LLDB_INVALID_ADDRESS); 1398 uint8_t addr_bytes[sizeof(lldb::addr_t)]; 1399 uint32_t addr_size = process->GetAddressByteSize(); 1400 Error error; 1401 if (process->ReadMemory(pointer_addr, &addr_bytes, addr_size, error) == addr_size) 1402 { 1403 DataExtractor addr_data(addr_bytes, sizeof(addr_bytes), process->GetByteOrder(), addr_size); 1404 uint32_t addr_data_offset = 0; 1405 stack.back().GetScalar() = addr_data.GetPointer(&addr_data_offset); 1406 stack.back().ClearContext(); 1407 } 1408 else 1409 { 1410 if (error_ptr) 1411 error_ptr->SetErrorStringWithFormat ("Failed to dereference pointer from 0x%llx for DW_OP_deref: %s\n", 1412 pointer_addr, 1413 error.AsCString()); 1414 return false; 1415 } 1416 } 1417 else 1418 { 1419 if (error_ptr) 1420 error_ptr->SetErrorStringWithFormat ("NULL process for DW_OP_deref.\n"); 1421 return false; 1422 } 1423 } 1424 else 1425 { 1426 if (error_ptr) 1427 error_ptr->SetErrorStringWithFormat ("NULL execution context for DW_OP_deref.\n"); 1428 return false; 1429 } 1430 break; 1431 1432 default: 1433 break; 1434 } 1435 1436 } 1437 break; 1438 1439 //---------------------------------------------------------------------- 1440 // OPCODE: DW_OP_deref_size 1441 // OPERANDS: 1 1442 // 1 - uint8_t that specifies the size of the data to dereference. 1443 // DESCRIPTION: Behaves like the DW_OP_deref operation: it pops the top 1444 // stack entry and treats it as an address. The value retrieved from that 1445 // address is pushed. In the DW_OP_deref_size operation, however, the 1446 // size in bytes of the data retrieved from the dereferenced address is 1447 // specified by the single operand. This operand is a 1-byte unsigned 1448 // integral constant whose value may not be larger than the size of an 1449 // address on the target machine. The data retrieved is zero extended 1450 // to the size of an address on the target machine before being pushed 1451 // on the expression stack. 1452 //---------------------------------------------------------------------- 1453 case DW_OP_deref_size: 1454 { 1455 uint8_t size = opcodes.GetU8(&offset); 1456 Value::ValueType value_type = stack.back().GetValueType(); 1457 switch (value_type) 1458 { 1459 case Value::eValueTypeHostAddress: 1460 { 1461 void *src = (void *)stack.back().GetScalar().ULongLong(); 1462 intptr_t ptr; 1463 ::memcpy (&ptr, src, sizeof(void *)); 1464 // I can't decide whether the size operand should apply to the bytes in their 1465 // lldb-host endianness or the target endianness.. I doubt this'll ever come up 1466 // but I'll opt for assuming big endian regardless. 1467 switch (size) 1468 { 1469 case 1: ptr = ptr & 0xff; break; 1470 case 2: ptr = ptr & 0xffff; break; 1471 case 3: ptr = ptr & 0xffffff; break; 1472 case 4: ptr = ptr & 0xffffffff; break; 1473 // the casts are added to work around the case where intptr_t is a 32 bit quantity; 1474 // presumably we won't hit the 5..7 cases if (void*) is 32-bits in this program. 1475 case 5: ptr = (intptr_t) ptr & 0xffffffffffULL; break; 1476 case 6: ptr = (intptr_t) ptr & 0xffffffffffffULL; break; 1477 case 7: ptr = (intptr_t) ptr & 0xffffffffffffffULL; break; 1478 default: break; 1479 } 1480 stack.back().GetScalar() = ptr; 1481 stack.back().ClearContext(); 1482 } 1483 break; 1484 case Value::eValueTypeLoadAddress: 1485 if (exe_ctx) 1486 { 1487 if (process) 1488 { 1489 lldb::addr_t pointer_addr = stack.back().GetScalar().ULongLong(LLDB_INVALID_ADDRESS); 1490 uint8_t addr_bytes[sizeof(lldb::addr_t)]; 1491 Error error; 1492 if (process->ReadMemory(pointer_addr, &addr_bytes, size, error) == size) 1493 { 1494 DataExtractor addr_data(addr_bytes, sizeof(addr_bytes), process->GetByteOrder(), size); 1495 uint32_t addr_data_offset = 0; 1496 switch (size) 1497 { 1498 case 1: stack.back().GetScalar() = addr_data.GetU8(&addr_data_offset); break; 1499 case 2: stack.back().GetScalar() = addr_data.GetU16(&addr_data_offset); break; 1500 case 4: stack.back().GetScalar() = addr_data.GetU32(&addr_data_offset); break; 1501 case 8: stack.back().GetScalar() = addr_data.GetU64(&addr_data_offset); break; 1502 default: stack.back().GetScalar() = addr_data.GetPointer(&addr_data_offset); 1503 } 1504 stack.back().ClearContext(); 1505 } 1506 else 1507 { 1508 if (error_ptr) 1509 error_ptr->SetErrorStringWithFormat ("Failed to dereference pointer from 0x%llx for DW_OP_deref: %s\n", 1510 pointer_addr, 1511 error.AsCString()); 1512 return false; 1513 } 1514 } 1515 else 1516 { 1517 if (error_ptr) 1518 error_ptr->SetErrorStringWithFormat ("NULL process for DW_OP_deref.\n"); 1519 return false; 1520 } 1521 } 1522 else 1523 { 1524 if (error_ptr) 1525 error_ptr->SetErrorStringWithFormat ("NULL execution context for DW_OP_deref.\n"); 1526 return false; 1527 } 1528 break; 1529 1530 default: 1531 break; 1532 } 1533 1534 } 1535 break; 1536 1537 //---------------------------------------------------------------------- 1538 // OPCODE: DW_OP_xderef_size 1539 // OPERANDS: 1 1540 // 1 - uint8_t that specifies the size of the data to dereference. 1541 // DESCRIPTION: Behaves like the DW_OP_xderef operation: the entry at 1542 // the top of the stack is treated as an address. The second stack 1543 // entry is treated as an "address space identifier" for those 1544 // architectures that support multiple address spaces. The top two 1545 // stack elements are popped, a data item is retrieved through an 1546 // implementation-defined address calculation and pushed as the new 1547 // stack top. In the DW_OP_xderef_size operation, however, the size in 1548 // bytes of the data retrieved from the dereferenced address is 1549 // specified by the single operand. This operand is a 1-byte unsigned 1550 // integral constant whose value may not be larger than the size of an 1551 // address on the target machine. The data retrieved is zero extended 1552 // to the size of an address on the target machine before being pushed 1553 // on the expression stack. 1554 //---------------------------------------------------------------------- 1555 case DW_OP_xderef_size: 1556 if (error_ptr) 1557 error_ptr->SetErrorString("Unimplemented opcode: DW_OP_xderef_size."); 1558 return false; 1559 //---------------------------------------------------------------------- 1560 // OPCODE: DW_OP_xderef 1561 // OPERANDS: none 1562 // DESCRIPTION: Provides an extended dereference mechanism. The entry at 1563 // the top of the stack is treated as an address. The second stack entry 1564 // is treated as an "address space identifier" for those architectures 1565 // that support multiple address spaces. The top two stack elements are 1566 // popped, a data item is retrieved through an implementation-defined 1567 // address calculation and pushed as the new stack top. The size of the 1568 // data retrieved from the dereferenced address is the size of an address 1569 // on the target machine. 1570 //---------------------------------------------------------------------- 1571 case DW_OP_xderef: 1572 if (error_ptr) 1573 error_ptr->SetErrorString("Unimplemented opcode: DW_OP_xderef."); 1574 return false; 1575 1576 //---------------------------------------------------------------------- 1577 // All DW_OP_constXXX opcodes have a single operand as noted below: 1578 // 1579 // Opcode Operand 1 1580 // --------------- ---------------------------------------------------- 1581 // DW_OP_const1u 1-byte unsigned integer constant 1582 // DW_OP_const1s 1-byte signed integer constant 1583 // DW_OP_const2u 2-byte unsigned integer constant 1584 // DW_OP_const2s 2-byte signed integer constant 1585 // DW_OP_const4u 4-byte unsigned integer constant 1586 // DW_OP_const4s 4-byte signed integer constant 1587 // DW_OP_const8u 8-byte unsigned integer constant 1588 // DW_OP_const8s 8-byte signed integer constant 1589 // DW_OP_constu unsigned LEB128 integer constant 1590 // DW_OP_consts signed LEB128 integer constant 1591 //---------------------------------------------------------------------- 1592 case DW_OP_const1u : stack.push_back(Scalar(( uint8_t)opcodes.GetU8 (&offset))); break; 1593 case DW_OP_const1s : stack.push_back(Scalar(( int8_t)opcodes.GetU8 (&offset))); break; 1594 case DW_OP_const2u : stack.push_back(Scalar((uint16_t)opcodes.GetU16 (&offset))); break; 1595 case DW_OP_const2s : stack.push_back(Scalar(( int16_t)opcodes.GetU16 (&offset))); break; 1596 case DW_OP_const4u : stack.push_back(Scalar((uint32_t)opcodes.GetU32 (&offset))); break; 1597 case DW_OP_const4s : stack.push_back(Scalar(( int32_t)opcodes.GetU32 (&offset))); break; 1598 case DW_OP_const8u : stack.push_back(Scalar((uint64_t)opcodes.GetU64 (&offset))); break; 1599 case DW_OP_const8s : stack.push_back(Scalar(( int64_t)opcodes.GetU64 (&offset))); break; 1600 case DW_OP_constu : stack.push_back(Scalar(opcodes.GetULEB128 (&offset))); break; 1601 case DW_OP_consts : stack.push_back(Scalar(opcodes.GetSLEB128 (&offset))); break; 1602 1603 //---------------------------------------------------------------------- 1604 // OPCODE: DW_OP_dup 1605 // OPERANDS: none 1606 // DESCRIPTION: duplicates the value at the top of the stack 1607 //---------------------------------------------------------------------- 1608 case DW_OP_dup: 1609 if (stack.empty()) 1610 { 1611 if (error_ptr) 1612 error_ptr->SetErrorString("Expression stack empty for DW_OP_dup."); 1613 return false; 1614 } 1615 else 1616 stack.push_back(stack.back()); 1617 break; 1618 1619 //---------------------------------------------------------------------- 1620 // OPCODE: DW_OP_drop 1621 // OPERANDS: none 1622 // DESCRIPTION: pops the value at the top of the stack 1623 //---------------------------------------------------------------------- 1624 case DW_OP_drop: 1625 if (stack.empty()) 1626 { 1627 if (error_ptr) 1628 error_ptr->SetErrorString("Expression stack empty for DW_OP_drop."); 1629 return false; 1630 } 1631 else 1632 stack.pop_back(); 1633 break; 1634 1635 //---------------------------------------------------------------------- 1636 // OPCODE: DW_OP_over 1637 // OPERANDS: none 1638 // DESCRIPTION: Duplicates the entry currently second in the stack at 1639 // the top of the stack. 1640 //---------------------------------------------------------------------- 1641 case DW_OP_over: 1642 if (stack.size() < 2) 1643 { 1644 if (error_ptr) 1645 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_over."); 1646 return false; 1647 } 1648 else 1649 stack.push_back(stack[stack.size() - 2]); 1650 break; 1651 1652 1653 //---------------------------------------------------------------------- 1654 // OPCODE: DW_OP_pick 1655 // OPERANDS: uint8_t index into the current stack 1656 // DESCRIPTION: The stack entry with the specified index (0 through 255, 1657 // inclusive) is pushed on the stack 1658 //---------------------------------------------------------------------- 1659 case DW_OP_pick: 1660 { 1661 uint8_t pick_idx = opcodes.GetU8(&offset); 1662 if (pick_idx < stack.size()) 1663 stack.push_back(stack[pick_idx]); 1664 else 1665 { 1666 if (error_ptr) 1667 error_ptr->SetErrorStringWithFormat("Index %u out of range for DW_OP_pick.\n", pick_idx); 1668 return false; 1669 } 1670 } 1671 break; 1672 1673 //---------------------------------------------------------------------- 1674 // OPCODE: DW_OP_swap 1675 // OPERANDS: none 1676 // DESCRIPTION: swaps the top two stack entries. The entry at the top 1677 // of the stack becomes the second stack entry, and the second entry 1678 // becomes the top of the stack 1679 //---------------------------------------------------------------------- 1680 case DW_OP_swap: 1681 if (stack.size() < 2) 1682 { 1683 if (error_ptr) 1684 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_swap."); 1685 return false; 1686 } 1687 else 1688 { 1689 tmp = stack.back(); 1690 stack.back() = stack[stack.size() - 2]; 1691 stack[stack.size() - 2] = tmp; 1692 } 1693 break; 1694 1695 //---------------------------------------------------------------------- 1696 // OPCODE: DW_OP_rot 1697 // OPERANDS: none 1698 // DESCRIPTION: Rotates the first three stack entries. The entry at 1699 // the top of the stack becomes the third stack entry, the second 1700 // entry becomes the top of the stack, and the third entry becomes 1701 // the second entry. 1702 //---------------------------------------------------------------------- 1703 case DW_OP_rot: 1704 if (stack.size() < 3) 1705 { 1706 if (error_ptr) 1707 error_ptr->SetErrorString("Expression stack needs at least 3 items for DW_OP_rot."); 1708 return false; 1709 } 1710 else 1711 { 1712 size_t last_idx = stack.size() - 1; 1713 Value old_top = stack[last_idx]; 1714 stack[last_idx] = stack[last_idx - 1]; 1715 stack[last_idx - 1] = stack[last_idx - 2]; 1716 stack[last_idx - 2] = old_top; 1717 } 1718 break; 1719 1720 //---------------------------------------------------------------------- 1721 // OPCODE: DW_OP_abs 1722 // OPERANDS: none 1723 // DESCRIPTION: pops the top stack entry, interprets it as a signed 1724 // value and pushes its absolute value. If the absolute value can not be 1725 // represented, the result is undefined. 1726 //---------------------------------------------------------------------- 1727 case DW_OP_abs: 1728 if (stack.empty()) 1729 { 1730 if (error_ptr) 1731 error_ptr->SetErrorString("Expression stack needs at least 1 item for DW_OP_abs."); 1732 return false; 1733 } 1734 else if (stack.back().ResolveValue(exe_ctx, ast_context).AbsoluteValue() == false) 1735 { 1736 if (error_ptr) 1737 error_ptr->SetErrorString("Failed to take the absolute value of the first stack item."); 1738 return false; 1739 } 1740 break; 1741 1742 //---------------------------------------------------------------------- 1743 // OPCODE: DW_OP_and 1744 // OPERANDS: none 1745 // DESCRIPTION: pops the top two stack values, performs a bitwise and 1746 // operation on the two, and pushes the result. 1747 //---------------------------------------------------------------------- 1748 case DW_OP_and: 1749 if (stack.size() < 2) 1750 { 1751 if (error_ptr) 1752 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_and."); 1753 return false; 1754 } 1755 else 1756 { 1757 tmp = stack.back(); 1758 stack.pop_back(); 1759 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) & tmp.ResolveValue(exe_ctx, ast_context); 1760 } 1761 break; 1762 1763 //---------------------------------------------------------------------- 1764 // OPCODE: DW_OP_div 1765 // OPERANDS: none 1766 // DESCRIPTION: pops the top two stack values, divides the former second 1767 // entry by the former top of the stack using signed division, and 1768 // pushes the result. 1769 //---------------------------------------------------------------------- 1770 case DW_OP_div: 1771 if (stack.size() < 2) 1772 { 1773 if (error_ptr) 1774 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_div."); 1775 return false; 1776 } 1777 else 1778 { 1779 tmp = stack.back(); 1780 if (tmp.ResolveValue(exe_ctx, ast_context).IsZero()) 1781 { 1782 if (error_ptr) 1783 error_ptr->SetErrorString("Divide by zero."); 1784 return false; 1785 } 1786 else 1787 { 1788 stack.pop_back(); 1789 stack.back() = stack.back().ResolveValue(exe_ctx, ast_context) / tmp.ResolveValue(exe_ctx, ast_context); 1790 if (!stack.back().ResolveValue(exe_ctx, ast_context).IsValid()) 1791 { 1792 if (error_ptr) 1793 error_ptr->SetErrorString("Divide failed."); 1794 return false; 1795 } 1796 } 1797 } 1798 break; 1799 1800 //---------------------------------------------------------------------- 1801 // OPCODE: DW_OP_minus 1802 // OPERANDS: none 1803 // DESCRIPTION: pops the top two stack values, subtracts the former top 1804 // of the stack from the former second entry, and pushes the result. 1805 //---------------------------------------------------------------------- 1806 case DW_OP_minus: 1807 if (stack.size() < 2) 1808 { 1809 if (error_ptr) 1810 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_minus."); 1811 return false; 1812 } 1813 else 1814 { 1815 tmp = stack.back(); 1816 stack.pop_back(); 1817 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) - tmp.ResolveValue(exe_ctx, ast_context); 1818 } 1819 break; 1820 1821 //---------------------------------------------------------------------- 1822 // OPCODE: DW_OP_mod 1823 // OPERANDS: none 1824 // DESCRIPTION: pops the top two stack values and pushes the result of 1825 // the calculation: former second stack entry modulo the former top of 1826 // the stack. 1827 //---------------------------------------------------------------------- 1828 case DW_OP_mod: 1829 if (stack.size() < 2) 1830 { 1831 if (error_ptr) 1832 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_mod."); 1833 return false; 1834 } 1835 else 1836 { 1837 tmp = stack.back(); 1838 stack.pop_back(); 1839 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) % tmp.ResolveValue(exe_ctx, ast_context); 1840 } 1841 break; 1842 1843 1844 //---------------------------------------------------------------------- 1845 // OPCODE: DW_OP_mul 1846 // OPERANDS: none 1847 // DESCRIPTION: pops the top two stack entries, multiplies them 1848 // together, and pushes the result. 1849 //---------------------------------------------------------------------- 1850 case DW_OP_mul: 1851 if (stack.size() < 2) 1852 { 1853 if (error_ptr) 1854 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_mul."); 1855 return false; 1856 } 1857 else 1858 { 1859 tmp = stack.back(); 1860 stack.pop_back(); 1861 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) * tmp.ResolveValue(exe_ctx, ast_context); 1862 } 1863 break; 1864 1865 //---------------------------------------------------------------------- 1866 // OPCODE: DW_OP_neg 1867 // OPERANDS: none 1868 // DESCRIPTION: pops the top stack entry, and pushes its negation. 1869 //---------------------------------------------------------------------- 1870 case DW_OP_neg: 1871 if (stack.empty()) 1872 { 1873 if (error_ptr) 1874 error_ptr->SetErrorString("Expression stack needs at least 1 item for DW_OP_neg."); 1875 return false; 1876 } 1877 else 1878 { 1879 if (stack.back().ResolveValue(exe_ctx, ast_context).UnaryNegate() == false) 1880 { 1881 if (error_ptr) 1882 error_ptr->SetErrorString("Unary negate failed."); 1883 return false; 1884 } 1885 } 1886 break; 1887 1888 //---------------------------------------------------------------------- 1889 // OPCODE: DW_OP_not 1890 // OPERANDS: none 1891 // DESCRIPTION: pops the top stack entry, and pushes its bitwise 1892 // complement 1893 //---------------------------------------------------------------------- 1894 case DW_OP_not: 1895 if (stack.empty()) 1896 { 1897 if (error_ptr) 1898 error_ptr->SetErrorString("Expression stack needs at least 1 item for DW_OP_not."); 1899 return false; 1900 } 1901 else 1902 { 1903 if (stack.back().ResolveValue(exe_ctx, ast_context).OnesComplement() == false) 1904 { 1905 if (error_ptr) 1906 error_ptr->SetErrorString("Logical NOT failed."); 1907 return false; 1908 } 1909 } 1910 break; 1911 1912 //---------------------------------------------------------------------- 1913 // OPCODE: DW_OP_or 1914 // OPERANDS: none 1915 // DESCRIPTION: pops the top two stack entries, performs a bitwise or 1916 // operation on the two, and pushes the result. 1917 //---------------------------------------------------------------------- 1918 case DW_OP_or: 1919 if (stack.size() < 2) 1920 { 1921 if (error_ptr) 1922 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_or."); 1923 return false; 1924 } 1925 else 1926 { 1927 tmp = stack.back(); 1928 stack.pop_back(); 1929 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) | tmp.ResolveValue(exe_ctx, ast_context); 1930 } 1931 break; 1932 1933 //---------------------------------------------------------------------- 1934 // OPCODE: DW_OP_plus 1935 // OPERANDS: none 1936 // DESCRIPTION: pops the top two stack entries, adds them together, and 1937 // pushes the result. 1938 //---------------------------------------------------------------------- 1939 case DW_OP_plus: 1940 if (stack.size() < 2) 1941 { 1942 if (error_ptr) 1943 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_plus."); 1944 return false; 1945 } 1946 else 1947 { 1948 tmp = stack.back(); 1949 stack.pop_back(); 1950 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) + tmp.ResolveValue(exe_ctx, ast_context); 1951 } 1952 break; 1953 1954 //---------------------------------------------------------------------- 1955 // OPCODE: DW_OP_plus_uconst 1956 // OPERANDS: none 1957 // DESCRIPTION: pops the top stack entry, adds it to the unsigned LEB128 1958 // constant operand and pushes the result. 1959 //---------------------------------------------------------------------- 1960 case DW_OP_plus_uconst: 1961 if (stack.empty()) 1962 { 1963 if (error_ptr) 1964 error_ptr->SetErrorString("Expression stack needs at least 1 item for DW_OP_plus_uconst."); 1965 return false; 1966 } 1967 else 1968 { 1969 uint32_t uconst_value = opcodes.GetULEB128(&offset); 1970 // Implicit conversion from a UINT to a Scalar... 1971 stack.back().ResolveValue(exe_ctx, ast_context) += uconst_value; 1972 if (!stack.back().ResolveValue(exe_ctx, ast_context).IsValid()) 1973 { 1974 if (error_ptr) 1975 error_ptr->SetErrorString("DW_OP_plus_uconst failed."); 1976 return false; 1977 } 1978 } 1979 break; 1980 1981 //---------------------------------------------------------------------- 1982 // OPCODE: DW_OP_shl 1983 // OPERANDS: none 1984 // DESCRIPTION: pops the top two stack entries, shifts the former 1985 // second entry left by the number of bits specified by the former top 1986 // of the stack, and pushes the result. 1987 //---------------------------------------------------------------------- 1988 case DW_OP_shl: 1989 if (stack.size() < 2) 1990 { 1991 if (error_ptr) 1992 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_shl."); 1993 return false; 1994 } 1995 else 1996 { 1997 tmp = stack.back(); 1998 stack.pop_back(); 1999 stack.back().ResolveValue(exe_ctx, ast_context) <<= tmp.ResolveValue(exe_ctx, ast_context); 2000 } 2001 break; 2002 2003 //---------------------------------------------------------------------- 2004 // OPCODE: DW_OP_shr 2005 // OPERANDS: none 2006 // DESCRIPTION: pops the top two stack entries, shifts the former second 2007 // entry right logically (filling with zero bits) by the number of bits 2008 // specified by the former top of the stack, and pushes the result. 2009 //---------------------------------------------------------------------- 2010 case DW_OP_shr: 2011 if (stack.size() < 2) 2012 { 2013 if (error_ptr) 2014 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_shr."); 2015 return false; 2016 } 2017 else 2018 { 2019 tmp = stack.back(); 2020 stack.pop_back(); 2021 if (stack.back().ResolveValue(exe_ctx, ast_context).ShiftRightLogical(tmp.ResolveValue(exe_ctx, ast_context)) == false) 2022 { 2023 if (error_ptr) 2024 error_ptr->SetErrorString("DW_OP_shr failed."); 2025 return false; 2026 } 2027 } 2028 break; 2029 2030 //---------------------------------------------------------------------- 2031 // OPCODE: DW_OP_shra 2032 // OPERANDS: none 2033 // DESCRIPTION: pops the top two stack entries, shifts the former second 2034 // entry right arithmetically (divide the magnitude by 2, keep the same 2035 // sign for the result) by the number of bits specified by the former 2036 // top of the stack, and pushes the result. 2037 //---------------------------------------------------------------------- 2038 case DW_OP_shra: 2039 if (stack.size() < 2) 2040 { 2041 if (error_ptr) 2042 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_shra."); 2043 return false; 2044 } 2045 else 2046 { 2047 tmp = stack.back(); 2048 stack.pop_back(); 2049 stack.back().ResolveValue(exe_ctx, ast_context) >>= tmp.ResolveValue(exe_ctx, ast_context); 2050 } 2051 break; 2052 2053 //---------------------------------------------------------------------- 2054 // OPCODE: DW_OP_xor 2055 // OPERANDS: none 2056 // DESCRIPTION: pops the top two stack entries, performs the bitwise 2057 // exclusive-or operation on the two, and pushes the result. 2058 //---------------------------------------------------------------------- 2059 case DW_OP_xor: 2060 if (stack.size() < 2) 2061 { 2062 if (error_ptr) 2063 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_xor."); 2064 return false; 2065 } 2066 else 2067 { 2068 tmp = stack.back(); 2069 stack.pop_back(); 2070 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) ^ tmp.ResolveValue(exe_ctx, ast_context); 2071 } 2072 break; 2073 2074 2075 //---------------------------------------------------------------------- 2076 // OPCODE: DW_OP_skip 2077 // OPERANDS: int16_t 2078 // DESCRIPTION: An unconditional branch. Its single operand is a 2-byte 2079 // signed integer constant. The 2-byte constant is the number of bytes 2080 // of the DWARF expression to skip forward or backward from the current 2081 // operation, beginning after the 2-byte constant. 2082 //---------------------------------------------------------------------- 2083 case DW_OP_skip: 2084 { 2085 int16_t skip_offset = (int16_t)opcodes.GetU16(&offset); 2086 uint32_t new_offset = offset + skip_offset; 2087 if (new_offset >= opcodes_offset && new_offset < end_offset) 2088 offset = new_offset; 2089 else 2090 { 2091 if (error_ptr) 2092 error_ptr->SetErrorString("Invalid opcode offset in DW_OP_skip."); 2093 return false; 2094 } 2095 } 2096 break; 2097 2098 //---------------------------------------------------------------------- 2099 // OPCODE: DW_OP_bra 2100 // OPERANDS: int16_t 2101 // DESCRIPTION: A conditional branch. Its single operand is a 2-byte 2102 // signed integer constant. This operation pops the top of stack. If 2103 // the value popped is not the constant 0, the 2-byte constant operand 2104 // is the number of bytes of the DWARF expression to skip forward or 2105 // backward from the current operation, beginning after the 2-byte 2106 // constant. 2107 //---------------------------------------------------------------------- 2108 case DW_OP_bra: 2109 { 2110 tmp = stack.back(); 2111 stack.pop_back(); 2112 int16_t bra_offset = (int16_t)opcodes.GetU16(&offset); 2113 Scalar zero(0); 2114 if (tmp.ResolveValue(exe_ctx, ast_context) != zero) 2115 { 2116 uint32_t new_offset = offset + bra_offset; 2117 if (new_offset >= opcodes_offset && new_offset < end_offset) 2118 offset = new_offset; 2119 else 2120 { 2121 if (error_ptr) 2122 error_ptr->SetErrorString("Invalid opcode offset in DW_OP_bra."); 2123 return false; 2124 } 2125 } 2126 } 2127 break; 2128 2129 //---------------------------------------------------------------------- 2130 // OPCODE: DW_OP_eq 2131 // OPERANDS: none 2132 // DESCRIPTION: pops the top two stack values, compares using the 2133 // equals (==) operator. 2134 // STACK RESULT: push the constant value 1 onto the stack if the result 2135 // of the operation is true or the constant value 0 if the result of the 2136 // operation is false. 2137 //---------------------------------------------------------------------- 2138 case DW_OP_eq: 2139 if (stack.size() < 2) 2140 { 2141 if (error_ptr) 2142 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_eq."); 2143 return false; 2144 } 2145 else 2146 { 2147 tmp = stack.back(); 2148 stack.pop_back(); 2149 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) == tmp.ResolveValue(exe_ctx, ast_context); 2150 } 2151 break; 2152 2153 //---------------------------------------------------------------------- 2154 // OPCODE: DW_OP_ge 2155 // OPERANDS: none 2156 // DESCRIPTION: pops the top two stack values, compares using the 2157 // greater than or equal to (>=) operator. 2158 // STACK RESULT: push the constant value 1 onto the stack if the result 2159 // of the operation is true or the constant value 0 if the result of the 2160 // operation is false. 2161 //---------------------------------------------------------------------- 2162 case DW_OP_ge: 2163 if (stack.size() < 2) 2164 { 2165 if (error_ptr) 2166 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_ge."); 2167 return false; 2168 } 2169 else 2170 { 2171 tmp = stack.back(); 2172 stack.pop_back(); 2173 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) >= tmp.ResolveValue(exe_ctx, ast_context); 2174 } 2175 break; 2176 2177 //---------------------------------------------------------------------- 2178 // OPCODE: DW_OP_gt 2179 // OPERANDS: none 2180 // DESCRIPTION: pops the top two stack values, compares using the 2181 // greater than (>) operator. 2182 // STACK RESULT: push the constant value 1 onto the stack if the result 2183 // of the operation is true or the constant value 0 if the result of the 2184 // operation is false. 2185 //---------------------------------------------------------------------- 2186 case DW_OP_gt: 2187 if (stack.size() < 2) 2188 { 2189 if (error_ptr) 2190 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_gt."); 2191 return false; 2192 } 2193 else 2194 { 2195 tmp = stack.back(); 2196 stack.pop_back(); 2197 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) > tmp.ResolveValue(exe_ctx, ast_context); 2198 } 2199 break; 2200 2201 //---------------------------------------------------------------------- 2202 // OPCODE: DW_OP_le 2203 // OPERANDS: none 2204 // DESCRIPTION: pops the top two stack values, compares using the 2205 // less than or equal to (<=) operator. 2206 // STACK RESULT: push the constant value 1 onto the stack if the result 2207 // of the operation is true or the constant value 0 if the result of the 2208 // operation is false. 2209 //---------------------------------------------------------------------- 2210 case DW_OP_le: 2211 if (stack.size() < 2) 2212 { 2213 if (error_ptr) 2214 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_le."); 2215 return false; 2216 } 2217 else 2218 { 2219 tmp = stack.back(); 2220 stack.pop_back(); 2221 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) <= tmp.ResolveValue(exe_ctx, ast_context); 2222 } 2223 break; 2224 2225 //---------------------------------------------------------------------- 2226 // OPCODE: DW_OP_lt 2227 // OPERANDS: none 2228 // DESCRIPTION: pops the top two stack values, compares using the 2229 // less than (<) operator. 2230 // STACK RESULT: push the constant value 1 onto the stack if the result 2231 // of the operation is true or the constant value 0 if the result of the 2232 // operation is false. 2233 //---------------------------------------------------------------------- 2234 case DW_OP_lt: 2235 if (stack.size() < 2) 2236 { 2237 if (error_ptr) 2238 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_lt."); 2239 return false; 2240 } 2241 else 2242 { 2243 tmp = stack.back(); 2244 stack.pop_back(); 2245 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) < tmp.ResolveValue(exe_ctx, ast_context); 2246 } 2247 break; 2248 2249 //---------------------------------------------------------------------- 2250 // OPCODE: DW_OP_ne 2251 // OPERANDS: none 2252 // DESCRIPTION: pops the top two stack values, compares using the 2253 // not equal (!=) operator. 2254 // STACK RESULT: push the constant value 1 onto the stack if the result 2255 // of the operation is true or the constant value 0 if the result of the 2256 // operation is false. 2257 //---------------------------------------------------------------------- 2258 case DW_OP_ne: 2259 if (stack.size() < 2) 2260 { 2261 if (error_ptr) 2262 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_ne."); 2263 return false; 2264 } 2265 else 2266 { 2267 tmp = stack.back(); 2268 stack.pop_back(); 2269 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) != tmp.ResolveValue(exe_ctx, ast_context); 2270 } 2271 break; 2272 2273 //---------------------------------------------------------------------- 2274 // OPCODE: DW_OP_litn 2275 // OPERANDS: none 2276 // DESCRIPTION: encode the unsigned literal values from 0 through 31. 2277 // STACK RESULT: push the unsigned literal constant value onto the top 2278 // of the stack. 2279 //---------------------------------------------------------------------- 2280 case DW_OP_lit0: 2281 case DW_OP_lit1: 2282 case DW_OP_lit2: 2283 case DW_OP_lit3: 2284 case DW_OP_lit4: 2285 case DW_OP_lit5: 2286 case DW_OP_lit6: 2287 case DW_OP_lit7: 2288 case DW_OP_lit8: 2289 case DW_OP_lit9: 2290 case DW_OP_lit10: 2291 case DW_OP_lit11: 2292 case DW_OP_lit12: 2293 case DW_OP_lit13: 2294 case DW_OP_lit14: 2295 case DW_OP_lit15: 2296 case DW_OP_lit16: 2297 case DW_OP_lit17: 2298 case DW_OP_lit18: 2299 case DW_OP_lit19: 2300 case DW_OP_lit20: 2301 case DW_OP_lit21: 2302 case DW_OP_lit22: 2303 case DW_OP_lit23: 2304 case DW_OP_lit24: 2305 case DW_OP_lit25: 2306 case DW_OP_lit26: 2307 case DW_OP_lit27: 2308 case DW_OP_lit28: 2309 case DW_OP_lit29: 2310 case DW_OP_lit30: 2311 case DW_OP_lit31: 2312 stack.push_back(Scalar(op - DW_OP_lit0)); 2313 break; 2314 2315 //---------------------------------------------------------------------- 2316 // OPCODE: DW_OP_regN 2317 // OPERANDS: none 2318 // DESCRIPTION: Push the value in register n on the top of the stack. 2319 //---------------------------------------------------------------------- 2320 case DW_OP_reg0: 2321 case DW_OP_reg1: 2322 case DW_OP_reg2: 2323 case DW_OP_reg3: 2324 case DW_OP_reg4: 2325 case DW_OP_reg5: 2326 case DW_OP_reg6: 2327 case DW_OP_reg7: 2328 case DW_OP_reg8: 2329 case DW_OP_reg9: 2330 case DW_OP_reg10: 2331 case DW_OP_reg11: 2332 case DW_OP_reg12: 2333 case DW_OP_reg13: 2334 case DW_OP_reg14: 2335 case DW_OP_reg15: 2336 case DW_OP_reg16: 2337 case DW_OP_reg17: 2338 case DW_OP_reg18: 2339 case DW_OP_reg19: 2340 case DW_OP_reg20: 2341 case DW_OP_reg21: 2342 case DW_OP_reg22: 2343 case DW_OP_reg23: 2344 case DW_OP_reg24: 2345 case DW_OP_reg25: 2346 case DW_OP_reg26: 2347 case DW_OP_reg27: 2348 case DW_OP_reg28: 2349 case DW_OP_reg29: 2350 case DW_OP_reg30: 2351 case DW_OP_reg31: 2352 { 2353 reg_num = op - DW_OP_reg0; 2354 2355 if (ReadRegisterValueAsScalar (reg_ctx, reg_kind, reg_num, error_ptr, tmp)) 2356 stack.push_back(tmp); 2357 else 2358 return false; 2359 } 2360 break; 2361 //---------------------------------------------------------------------- 2362 // OPCODE: DW_OP_regx 2363 // OPERANDS: 2364 // ULEB128 literal operand that encodes the register. 2365 // DESCRIPTION: Push the value in register on the top of the stack. 2366 //---------------------------------------------------------------------- 2367 case DW_OP_regx: 2368 { 2369 reg_num = opcodes.GetULEB128(&offset); 2370 if (ReadRegisterValueAsScalar (reg_ctx, reg_kind, reg_num, error_ptr, tmp)) 2371 stack.push_back(tmp); 2372 else 2373 return false; 2374 } 2375 break; 2376 2377 //---------------------------------------------------------------------- 2378 // OPCODE: DW_OP_bregN 2379 // OPERANDS: 2380 // SLEB128 offset from register N 2381 // DESCRIPTION: Value is in memory at the address specified by register 2382 // N plus an offset. 2383 //---------------------------------------------------------------------- 2384 case DW_OP_breg0: 2385 case DW_OP_breg1: 2386 case DW_OP_breg2: 2387 case DW_OP_breg3: 2388 case DW_OP_breg4: 2389 case DW_OP_breg5: 2390 case DW_OP_breg6: 2391 case DW_OP_breg7: 2392 case DW_OP_breg8: 2393 case DW_OP_breg9: 2394 case DW_OP_breg10: 2395 case DW_OP_breg11: 2396 case DW_OP_breg12: 2397 case DW_OP_breg13: 2398 case DW_OP_breg14: 2399 case DW_OP_breg15: 2400 case DW_OP_breg16: 2401 case DW_OP_breg17: 2402 case DW_OP_breg18: 2403 case DW_OP_breg19: 2404 case DW_OP_breg20: 2405 case DW_OP_breg21: 2406 case DW_OP_breg22: 2407 case DW_OP_breg23: 2408 case DW_OP_breg24: 2409 case DW_OP_breg25: 2410 case DW_OP_breg26: 2411 case DW_OP_breg27: 2412 case DW_OP_breg28: 2413 case DW_OP_breg29: 2414 case DW_OP_breg30: 2415 case DW_OP_breg31: 2416 { 2417 reg_num = op - DW_OP_breg0; 2418 2419 if (ReadRegisterValueAsScalar (reg_ctx, reg_kind, reg_num, error_ptr, tmp)) 2420 { 2421 int64_t breg_offset = opcodes.GetSLEB128(&offset); 2422 tmp.ResolveValue(exe_ctx, ast_context) += (uint64_t)breg_offset; 2423 stack.push_back(tmp); 2424 stack.back().SetValueType (Value::eValueTypeLoadAddress); 2425 } 2426 else 2427 return false; 2428 } 2429 break; 2430 //---------------------------------------------------------------------- 2431 // OPCODE: DW_OP_bregx 2432 // OPERANDS: 2 2433 // ULEB128 literal operand that encodes the register. 2434 // SLEB128 offset from register N 2435 // DESCRIPTION: Value is in memory at the address specified by register 2436 // N plus an offset. 2437 //---------------------------------------------------------------------- 2438 case DW_OP_bregx: 2439 { 2440 reg_num = opcodes.GetULEB128(&offset); 2441 2442 if (ReadRegisterValueAsScalar (reg_ctx, reg_kind, reg_num, error_ptr, tmp)) 2443 { 2444 int64_t breg_offset = opcodes.GetSLEB128(&offset); 2445 tmp.ResolveValue(exe_ctx, ast_context) += (uint64_t)breg_offset; 2446 stack.push_back(tmp); 2447 stack.back().SetValueType (Value::eValueTypeLoadAddress); 2448 } 2449 else 2450 return false; 2451 } 2452 break; 2453 2454 case DW_OP_fbreg: 2455 if (exe_ctx) 2456 { 2457 if (frame) 2458 { 2459 Scalar value; 2460 if (frame->GetFrameBaseValue(value, error_ptr)) 2461 { 2462 int64_t fbreg_offset = opcodes.GetSLEB128(&offset); 2463 value += fbreg_offset; 2464 stack.push_back(value); 2465 stack.back().SetValueType (Value::eValueTypeLoadAddress); 2466 } 2467 else 2468 return false; 2469 } 2470 else 2471 { 2472 if (error_ptr) 2473 error_ptr->SetErrorString ("Invalid stack frame in context for DW_OP_fbreg opcode."); 2474 return false; 2475 } 2476 } 2477 else 2478 { 2479 if (error_ptr) 2480 error_ptr->SetErrorStringWithFormat ("NULL execution context for DW_OP_fbreg.\n"); 2481 return false; 2482 } 2483 2484 break; 2485 2486 //---------------------------------------------------------------------- 2487 // OPCODE: DW_OP_nop 2488 // OPERANDS: none 2489 // DESCRIPTION: A place holder. It has no effect on the location stack 2490 // or any of its values. 2491 //---------------------------------------------------------------------- 2492 case DW_OP_nop: 2493 break; 2494 2495 //---------------------------------------------------------------------- 2496 // OPCODE: DW_OP_piece 2497 // OPERANDS: 1 2498 // ULEB128: byte size of the piece 2499 // DESCRIPTION: The operand describes the size in bytes of the piece of 2500 // the object referenced by the DWARF expression whose result is at the 2501 // top of the stack. If the piece is located in a register, but does not 2502 // occupy the entire register, the placement of the piece within that 2503 // register is defined by the ABI. 2504 // 2505 // Many compilers store a single variable in sets of registers, or store 2506 // a variable partially in memory and partially in registers. 2507 // DW_OP_piece provides a way of describing how large a part of a 2508 // variable a particular DWARF expression refers to. 2509 //---------------------------------------------------------------------- 2510 case DW_OP_piece: 2511 if (error_ptr) 2512 error_ptr->SetErrorString ("Unimplemented opcode DW_OP_piece."); 2513 return false; 2514 2515 //---------------------------------------------------------------------- 2516 // OPCODE: DW_OP_push_object_address 2517 // OPERANDS: none 2518 // DESCRIPTION: Pushes the address of the object currently being 2519 // evaluated as part of evaluation of a user presented expression. 2520 // This object may correspond to an independent variable described by 2521 // its own DIE or it may be a component of an array, structure, or class 2522 // whose address has been dynamically determined by an earlier step 2523 // during user expression evaluation. 2524 //---------------------------------------------------------------------- 2525 case DW_OP_push_object_address: 2526 if (error_ptr) 2527 error_ptr->SetErrorString ("Unimplemented opcode DW_OP_push_object_address."); 2528 return false; 2529 2530 //---------------------------------------------------------------------- 2531 // OPCODE: DW_OP_call2 2532 // OPERANDS: 2533 // uint16_t compile unit relative offset of a DIE 2534 // DESCRIPTION: Performs subroutine calls during evaluation 2535 // of a DWARF expression. The operand is the 2-byte unsigned offset 2536 // of a debugging information entry in the current compilation unit. 2537 // 2538 // Operand interpretation is exactly like that for DW_FORM_ref2. 2539 // 2540 // This operation transfers control of DWARF expression evaluation 2541 // to the DW_AT_location attribute of the referenced DIE. If there is 2542 // no such attribute, then there is no effect. Execution of the DWARF 2543 // expression of a DW_AT_location attribute may add to and/or remove from 2544 // values on the stack. Execution returns to the point following the call 2545 // when the end of the attribute is reached. Values on the stack at the 2546 // time of the call may be used as parameters by the called expression 2547 // and values left on the stack by the called expression may be used as 2548 // return values by prior agreement between the calling and called 2549 // expressions. 2550 //---------------------------------------------------------------------- 2551 case DW_OP_call2: 2552 if (error_ptr) 2553 error_ptr->SetErrorString ("Unimplemented opcode DW_OP_call2."); 2554 return false; 2555 //---------------------------------------------------------------------- 2556 // OPCODE: DW_OP_call4 2557 // OPERANDS: 1 2558 // uint32_t compile unit relative offset of a DIE 2559 // DESCRIPTION: Performs a subroutine call during evaluation of a DWARF 2560 // expression. For DW_OP_call4, the operand is a 4-byte unsigned offset 2561 // of a debugging information entry in the current compilation unit. 2562 // 2563 // Operand interpretation DW_OP_call4 is exactly like that for 2564 // DW_FORM_ref4. 2565 // 2566 // This operation transfers control of DWARF expression evaluation 2567 // to the DW_AT_location attribute of the referenced DIE. If there is 2568 // no such attribute, then there is no effect. Execution of the DWARF 2569 // expression of a DW_AT_location attribute may add to and/or remove from 2570 // values on the stack. Execution returns to the point following the call 2571 // when the end of the attribute is reached. Values on the stack at the 2572 // time of the call may be used as parameters by the called expression 2573 // and values left on the stack by the called expression may be used as 2574 // return values by prior agreement between the calling and called 2575 // expressions. 2576 //---------------------------------------------------------------------- 2577 case DW_OP_call4: 2578 if (error_ptr) 2579 error_ptr->SetErrorString ("Unimplemented opcode DW_OP_call4."); 2580 return false; 2581 2582 #if 0 2583 //---------------------------------------------------------------------- 2584 // OPCODE: DW_OP_call_ref 2585 // OPERANDS: 2586 // uint32_t absolute DIE offset for 32-bit DWARF or a uint64_t 2587 // absolute DIE offset for 64 bit DWARF. 2588 // DESCRIPTION: Performs a subroutine call during evaluation of a DWARF 2589 // expression. Takes a single operand. In the 32-bit DWARF format, the 2590 // operand is a 4-byte unsigned value; in the 64-bit DWARF format, it 2591 // is an 8-byte unsigned value. The operand is used as the offset of a 2592 // debugging information entry in a .debug_info section which may be 2593 // contained in a shared object for executable other than that 2594 // containing the operator. For references from one shared object or 2595 // executable to another, the relocation must be performed by the 2596 // consumer. 2597 // 2598 // Operand interpretation of DW_OP_call_ref is exactly like that for 2599 // DW_FORM_ref_addr. 2600 // 2601 // This operation transfers control of DWARF expression evaluation 2602 // to the DW_AT_location attribute of the referenced DIE. If there is 2603 // no such attribute, then there is no effect. Execution of the DWARF 2604 // expression of a DW_AT_location attribute may add to and/or remove from 2605 // values on the stack. Execution returns to the point following the call 2606 // when the end of the attribute is reached. Values on the stack at the 2607 // time of the call may be used as parameters by the called expression 2608 // and values left on the stack by the called expression may be used as 2609 // return values by prior agreement between the calling and called 2610 // expressions. 2611 //---------------------------------------------------------------------- 2612 case DW_OP_call_ref: 2613 if (error_ptr) 2614 error_ptr->SetErrorString ("Unimplemented opcode DW_OP_call_ref."); 2615 return false; 2616 2617 //---------------------------------------------------------------------- 2618 // OPCODE: DW_OP_APPLE_array_ref 2619 // OPERANDS: none 2620 // DESCRIPTION: Pops a value off the stack and uses it as the array 2621 // index. Pops a second value off the stack and uses it as the array 2622 // itself. Pushes a value onto the stack representing the element of 2623 // the array specified by the index. 2624 //---------------------------------------------------------------------- 2625 case DW_OP_APPLE_array_ref: 2626 { 2627 if (stack.size() < 2) 2628 { 2629 if (error_ptr) 2630 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_APPLE_array_ref."); 2631 return false; 2632 } 2633 2634 Value index_val = stack.back(); 2635 stack.pop_back(); 2636 Value array_val = stack.back(); 2637 stack.pop_back(); 2638 2639 Scalar &index_scalar = index_val.ResolveValue(exe_ctx, ast_context); 2640 int64_t index = index_scalar.SLongLong(LLONG_MAX); 2641 2642 if (index == LLONG_MAX) 2643 { 2644 if (error_ptr) 2645 error_ptr->SetErrorString("Invalid array index."); 2646 return false; 2647 } 2648 2649 if (array_val.GetContextType() != Value::eContextTypeClangType) 2650 { 2651 if (error_ptr) 2652 error_ptr->SetErrorString("Arrays without Clang types are unhandled at this time."); 2653 return false; 2654 } 2655 2656 if (array_val.GetValueType() != Value::eValueTypeLoadAddress && 2657 array_val.GetValueType() != Value::eValueTypeHostAddress) 2658 { 2659 if (error_ptr) 2660 error_ptr->SetErrorString("Array must be stored in memory."); 2661 return false; 2662 } 2663 2664 void *array_type = array_val.GetClangType(); 2665 2666 void *member_type; 2667 uint64_t size = 0; 2668 2669 if ((!ClangASTContext::IsPointerType(array_type, &member_type)) && 2670 (!ClangASTContext::IsArrayType(array_type, &member_type, &size))) 2671 { 2672 if (error_ptr) 2673 error_ptr->SetErrorString("Array reference from something that is neither a pointer nor an array."); 2674 return false; 2675 } 2676 2677 if (size && (index >= size || index < 0)) 2678 { 2679 if (error_ptr) 2680 error_ptr->SetErrorStringWithFormat("Out of bounds array access. %lld is not in [0, %llu]", index, size); 2681 return false; 2682 } 2683 2684 uint64_t member_bit_size = ClangASTType::GetClangTypeBitWidth(ast_context, member_type); 2685 uint64_t member_bit_align = ClangASTType::GetTypeBitAlign(ast_context, member_type); 2686 uint64_t member_bit_incr = ((member_bit_size + member_bit_align - 1) / member_bit_align) * member_bit_align; 2687 if (member_bit_incr % 8) 2688 { 2689 if (error_ptr) 2690 error_ptr->SetErrorStringWithFormat("Array increment is not byte aligned"); 2691 return false; 2692 } 2693 int64_t member_offset = (int64_t)(member_bit_incr / 8) * index; 2694 2695 Value member; 2696 2697 member.SetContext(Value::eContextTypeClangType, member_type); 2698 member.SetValueType(array_val.GetValueType()); 2699 2700 addr_t array_base = (addr_t)array_val.GetScalar().ULongLong(LLDB_INVALID_ADDRESS); 2701 addr_t member_loc = array_base + member_offset; 2702 member.GetScalar() = (uint64_t)member_loc; 2703 2704 stack.push_back(member); 2705 } 2706 break; 2707 2708 //---------------------------------------------------------------------- 2709 // OPCODE: DW_OP_APPLE_uninit 2710 // OPERANDS: none 2711 // DESCRIPTION: Lets us know that the value is currently not initialized 2712 //---------------------------------------------------------------------- 2713 case DW_OP_APPLE_uninit: 2714 //return eResultTypeErrorUninitialized; 2715 break; // Ignore this as we have seen cases where this value is incorrectly added 2716 2717 //---------------------------------------------------------------------- 2718 // OPCODE: DW_OP_APPLE_assign 2719 // OPERANDS: none 2720 // DESCRIPTION: Pops a value off of the stack and assigns it to the next 2721 // item on the stack which must be something assignable (inferior 2722 // Variable, inferior Type with address, inferior register, or 2723 // expression local variable. 2724 //---------------------------------------------------------------------- 2725 case DW_OP_APPLE_assign: 2726 if (stack.size() < 2) 2727 { 2728 if (error_ptr) 2729 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_APPLE_assign."); 2730 return false; 2731 } 2732 else 2733 { 2734 tmp = stack.back(); 2735 stack.pop_back(); 2736 Value::ContextType context_type = stack.back().GetContextType(); 2737 StreamString new_value(Stream::eBinary, 4, lldb::endian::InlHostByteOrder()); 2738 switch (context_type) 2739 { 2740 case Value::eContextTypeClangType: 2741 { 2742 void *clang_type = stack.back().GetClangType(); 2743 2744 if (ClangASTContext::IsAggregateType (clang_type)) 2745 { 2746 Value::ValueType source_value_type = tmp.GetValueType(); 2747 Value::ValueType target_value_type = stack.back().GetValueType(); 2748 2749 addr_t source_addr = (addr_t)tmp.GetScalar().ULongLong(); 2750 addr_t target_addr = (addr_t)stack.back().GetScalar().ULongLong(); 2751 2752 size_t byte_size = (ClangASTType::GetClangTypeBitWidth(ast_context, clang_type) + 7) / 8; 2753 2754 switch (source_value_type) 2755 { 2756 case Value::eValueTypeScalar: 2757 case Value::eValueTypeFileAddress: 2758 break; 2759 2760 case Value::eValueTypeLoadAddress: 2761 switch (target_value_type) 2762 { 2763 case Value::eValueTypeLoadAddress: 2764 { 2765 DataBufferHeap data; 2766 data.SetByteSize(byte_size); 2767 2768 Error error; 2769 if (process->ReadMemory (source_addr, data.GetBytes(), byte_size, error) != byte_size) 2770 { 2771 if (error_ptr) 2772 error_ptr->SetErrorStringWithFormat ("Couldn't read a composite type from the target: %s", error.AsCString()); 2773 return false; 2774 } 2775 2776 if (process->WriteMemory (target_addr, data.GetBytes(), byte_size, error) != byte_size) 2777 { 2778 if (error_ptr) 2779 error_ptr->SetErrorStringWithFormat ("Couldn't write a composite type to the target: %s", error.AsCString()); 2780 return false; 2781 } 2782 } 2783 break; 2784 case Value::eValueTypeHostAddress: 2785 if (process->GetByteOrder() != lldb::endian::InlHostByteOrder()) 2786 { 2787 if (error_ptr) 2788 error_ptr->SetErrorStringWithFormat ("Copy of composite types between incompatible byte orders is unimplemented"); 2789 return false; 2790 } 2791 else 2792 { 2793 Error error; 2794 if (process->ReadMemory (source_addr, (uint8_t*)target_addr, byte_size, error) != byte_size) 2795 { 2796 if (error_ptr) 2797 error_ptr->SetErrorStringWithFormat ("Couldn't read a composite type from the target: %s", error.AsCString()); 2798 return false; 2799 } 2800 } 2801 break; 2802 default: 2803 return false; 2804 } 2805 break; 2806 case Value::eValueTypeHostAddress: 2807 switch (target_value_type) 2808 { 2809 case Value::eValueTypeLoadAddress: 2810 if (process->GetByteOrder() != lldb::endian::InlHostByteOrder()) 2811 { 2812 if (error_ptr) 2813 error_ptr->SetErrorStringWithFormat ("Copy of composite types between incompatible byte orders is unimplemented"); 2814 return false; 2815 } 2816 else 2817 { 2818 Error error; 2819 if (process->WriteMemory (target_addr, (uint8_t*)source_addr, byte_size, error) != byte_size) 2820 { 2821 if (error_ptr) 2822 error_ptr->SetErrorStringWithFormat ("Couldn't write a composite type to the target: %s", error.AsCString()); 2823 return false; 2824 } 2825 } 2826 case Value::eValueTypeHostAddress: 2827 memcpy ((uint8_t*)target_addr, (uint8_t*)source_addr, byte_size); 2828 break; 2829 default: 2830 return false; 2831 } 2832 } 2833 } 2834 else 2835 { 2836 if (!ClangASTType::SetValueFromScalar (ast_context, 2837 clang_type, 2838 tmp.ResolveValue(exe_ctx, ast_context), 2839 new_value)) 2840 { 2841 if (error_ptr) 2842 error_ptr->SetErrorStringWithFormat ("Couldn't extract a value from an integral type.\n"); 2843 return false; 2844 } 2845 2846 Value::ValueType value_type = stack.back().GetValueType(); 2847 2848 switch (value_type) 2849 { 2850 case Value::eValueTypeLoadAddress: 2851 case Value::eValueTypeHostAddress: 2852 { 2853 AddressType address_type = (value_type == Value::eValueTypeLoadAddress ? eAddressTypeLoad : eAddressTypeHost); 2854 lldb::addr_t addr = stack.back().GetScalar().ULongLong(LLDB_INVALID_ADDRESS); 2855 if (!ClangASTType::WriteToMemory (ast_context, 2856 clang_type, 2857 exe_ctx, 2858 addr, 2859 address_type, 2860 new_value)) 2861 { 2862 if (error_ptr) 2863 error_ptr->SetErrorStringWithFormat ("Failed to write value to memory at 0x%llx.\n", addr); 2864 return false; 2865 } 2866 } 2867 break; 2868 2869 default: 2870 break; 2871 } 2872 } 2873 } 2874 break; 2875 2876 default: 2877 if (error_ptr) 2878 error_ptr->SetErrorString ("Assign failed."); 2879 return false; 2880 } 2881 } 2882 break; 2883 2884 //---------------------------------------------------------------------- 2885 // OPCODE: DW_OP_APPLE_address_of 2886 // OPERANDS: none 2887 // DESCRIPTION: Pops a value off of the stack and pushed its address. 2888 // The top item on the stack must be a variable, or already be a memory 2889 // location. 2890 //---------------------------------------------------------------------- 2891 case DW_OP_APPLE_address_of: 2892 if (stack.empty()) 2893 { 2894 if (error_ptr) 2895 error_ptr->SetErrorString("Expression stack needs at least 1 item for DW_OP_APPLE_address_of."); 2896 return false; 2897 } 2898 else 2899 { 2900 Value::ValueType value_type = stack.back().GetValueType(); 2901 switch (value_type) 2902 { 2903 default: 2904 case Value::eValueTypeScalar: // raw scalar value 2905 if (error_ptr) 2906 error_ptr->SetErrorString("Top stack item isn't a memory based object."); 2907 return false; 2908 2909 case Value::eValueTypeLoadAddress: // load address value 2910 case Value::eValueTypeFileAddress: // file address value 2911 case Value::eValueTypeHostAddress: // host address value (for memory in the process that is using liblldb) 2912 // Taking the address of an object reduces it to the address 2913 // of the value and removes any extra context it had. 2914 //stack.back().SetValueType(Value::eValueTypeScalar); 2915 stack.back().ClearContext(); 2916 break; 2917 } 2918 } 2919 break; 2920 2921 //---------------------------------------------------------------------- 2922 // OPCODE: DW_OP_APPLE_value_of 2923 // OPERANDS: none 2924 // DESCRIPTION: Pops a value off of the stack and pushed its value. 2925 // The top item on the stack must be a variable, expression variable. 2926 //---------------------------------------------------------------------- 2927 case DW_OP_APPLE_value_of: 2928 if (stack.empty()) 2929 { 2930 if (error_ptr) 2931 error_ptr->SetErrorString("Expression stack needs at least 1 items for DW_OP_APPLE_value_of."); 2932 return false; 2933 } 2934 else if (!stack.back().ValueOf(exe_ctx, ast_context)) 2935 { 2936 if (error_ptr) 2937 error_ptr->SetErrorString ("Top stack item isn't a valid candidate for DW_OP_APPLE_value_of."); 2938 return false; 2939 } 2940 break; 2941 2942 //---------------------------------------------------------------------- 2943 // OPCODE: DW_OP_APPLE_deref_type 2944 // OPERANDS: none 2945 // DESCRIPTION: gets the value pointed to by the top stack item 2946 //---------------------------------------------------------------------- 2947 case DW_OP_APPLE_deref_type: 2948 { 2949 if (stack.empty()) 2950 { 2951 if (error_ptr) 2952 error_ptr->SetErrorString("Expression stack needs at least 1 items for DW_OP_APPLE_deref_type."); 2953 return false; 2954 } 2955 2956 tmp = stack.back(); 2957 stack.pop_back(); 2958 2959 if (tmp.GetContextType() != Value::eContextTypeClangType) 2960 { 2961 if (error_ptr) 2962 error_ptr->SetErrorString("Item at top of expression stack must have a Clang type"); 2963 return false; 2964 } 2965 2966 void *ptr_type = tmp.GetClangType(); 2967 void *target_type; 2968 2969 if (!ClangASTContext::IsPointerType(ptr_type, &target_type)) 2970 { 2971 if (error_ptr) 2972 error_ptr->SetErrorString("Dereferencing a non-pointer type"); 2973 return false; 2974 } 2975 2976 // TODO do we want all pointers to be dereferenced as load addresses? 2977 Value::ValueType value_type = tmp.GetValueType(); 2978 2979 tmp.ResolveValue(exe_ctx, ast_context); 2980 2981 tmp.SetValueType(value_type); 2982 tmp.SetContext(Value::eContextTypeClangType, target_type); 2983 2984 stack.push_back(tmp); 2985 } 2986 break; 2987 2988 //---------------------------------------------------------------------- 2989 // OPCODE: DW_OP_APPLE_expr_local 2990 // OPERANDS: ULEB128 2991 // DESCRIPTION: pushes the expression local variable index onto the 2992 // stack and set the appropriate context so we know the stack item is 2993 // an expression local variable index. 2994 //---------------------------------------------------------------------- 2995 case DW_OP_APPLE_expr_local: 2996 { 2997 /* 2998 uint32_t idx = opcodes.GetULEB128(&offset); 2999 if (expr_locals == NULL) 3000 { 3001 if (error_ptr) 3002 error_ptr->SetErrorStringWithFormat ("DW_OP_APPLE_expr_local(%u) opcode encountered with no local variable list.\n", idx); 3003 return false; 3004 } 3005 Value *expr_local_variable = expr_locals->GetVariableAtIndex(idx); 3006 if (expr_local_variable == NULL) 3007 { 3008 if (error_ptr) 3009 error_ptr->SetErrorStringWithFormat ("DW_OP_APPLE_expr_local(%u) with invalid index %u.\n", idx, idx); 3010 return false; 3011 } 3012 // The proxy code has been removed. If it is ever re-added, please 3013 // use shared pointers or return by value to avoid possible memory 3014 // leak (there is no leak here, but in general, no returning pointers 3015 // that must be manually freed please. 3016 Value *proxy = expr_local_variable->CreateProxy(); 3017 stack.push_back(*proxy); 3018 delete proxy; 3019 //stack.back().SetContext (Value::eContextTypeClangType, expr_local_variable->GetClangType()); 3020 */ 3021 } 3022 break; 3023 3024 //---------------------------------------------------------------------- 3025 // OPCODE: DW_OP_APPLE_extern 3026 // OPERANDS: ULEB128 3027 // DESCRIPTION: pushes a proxy for the extern object index onto the 3028 // stack. 3029 //---------------------------------------------------------------------- 3030 case DW_OP_APPLE_extern: 3031 { 3032 /* 3033 uint32_t idx = opcodes.GetULEB128(&offset); 3034 if (!decl_map) 3035 { 3036 if (error_ptr) 3037 error_ptr->SetErrorStringWithFormat ("DW_OP_APPLE_extern(%u) opcode encountered with no decl map.\n", idx); 3038 return false; 3039 } 3040 Value *extern_var = decl_map->GetValueForIndex(idx); 3041 if (!extern_var) 3042 { 3043 if (error_ptr) 3044 error_ptr->SetErrorStringWithFormat ("DW_OP_APPLE_extern(%u) with invalid index %u.\n", idx, idx); 3045 return false; 3046 } 3047 // The proxy code has been removed. If it is ever re-added, please 3048 // use shared pointers or return by value to avoid possible memory 3049 // leak (there is no leak here, but in general, no returning pointers 3050 // that must be manually freed please. 3051 Value *proxy = extern_var->CreateProxy(); 3052 stack.push_back(*proxy); 3053 delete proxy; 3054 */ 3055 } 3056 break; 3057 3058 case DW_OP_APPLE_scalar_cast: 3059 if (stack.empty()) 3060 { 3061 if (error_ptr) 3062 error_ptr->SetErrorString("Expression stack needs at least 1 item for DW_OP_APPLE_scalar_cast."); 3063 return false; 3064 } 3065 else 3066 { 3067 // Simple scalar cast 3068 if (!stack.back().ResolveValue(exe_ctx, ast_context).Cast((Scalar::Type)opcodes.GetU8(&offset))) 3069 { 3070 if (error_ptr) 3071 error_ptr->SetErrorString("Cast failed."); 3072 return false; 3073 } 3074 } 3075 break; 3076 3077 3078 case DW_OP_APPLE_clang_cast: 3079 if (stack.empty()) 3080 { 3081 if (error_ptr) 3082 error_ptr->SetErrorString("Expression stack needs at least 1 item for DW_OP_APPLE_clang_cast."); 3083 return false; 3084 } 3085 else 3086 { 3087 void *clang_type = (void *)opcodes.GetMaxU64(&offset, sizeof(void*)); 3088 stack.back().SetContext (Value::eContextTypeClangType, clang_type); 3089 } 3090 break; 3091 //---------------------------------------------------------------------- 3092 // OPCODE: DW_OP_APPLE_constf 3093 // OPERANDS: 1 byte float length, followed by that many bytes containing 3094 // the constant float data. 3095 // DESCRIPTION: Push a float value onto the expression stack. 3096 //---------------------------------------------------------------------- 3097 case DW_OP_APPLE_constf: // 0xF6 - 1 byte float size, followed by constant float data 3098 { 3099 uint8_t float_length = opcodes.GetU8(&offset); 3100 if (sizeof(float) == float_length) 3101 tmp.ResolveValue(exe_ctx, ast_context) = opcodes.GetFloat (&offset); 3102 else if (sizeof(double) == float_length) 3103 tmp.ResolveValue(exe_ctx, ast_context) = opcodes.GetDouble (&offset); 3104 else if (sizeof(long double) == float_length) 3105 tmp.ResolveValue(exe_ctx, ast_context) = opcodes.GetLongDouble (&offset); 3106 else 3107 { 3108 StreamString new_value; 3109 opcodes.Dump(&new_value, offset, eFormatBytes, 1, float_length, UINT32_MAX, DW_INVALID_ADDRESS, 0, 0); 3110 3111 if (error_ptr) 3112 error_ptr->SetErrorStringWithFormat ("DW_OP_APPLE_constf(<%u> %s) unsupported float size.\n", float_length, new_value.GetData()); 3113 return false; 3114 } 3115 tmp.SetValueType(Value::eValueTypeScalar); 3116 tmp.ClearContext(); 3117 stack.push_back(tmp); 3118 } 3119 break; 3120 //---------------------------------------------------------------------- 3121 // OPCODE: DW_OP_APPLE_clear 3122 // OPERANDS: none 3123 // DESCRIPTION: Clears the expression stack. 3124 //---------------------------------------------------------------------- 3125 case DW_OP_APPLE_clear: 3126 stack.clear(); 3127 break; 3128 3129 //---------------------------------------------------------------------- 3130 // OPCODE: DW_OP_APPLE_error 3131 // OPERANDS: none 3132 // DESCRIPTION: Pops a value off of the stack and pushed its value. 3133 // The top item on the stack must be a variable, expression variable. 3134 //---------------------------------------------------------------------- 3135 case DW_OP_APPLE_error: // 0xFF - Stops expression evaluation and returns an error (no args) 3136 if (error_ptr) 3137 error_ptr->SetErrorString ("Generic error."); 3138 return false; 3139 #endif // #if 0 3140 3141 } 3142 } 3143 3144 if (stack.empty()) 3145 { 3146 if (error_ptr) 3147 error_ptr->SetErrorString ("Stack empty after evaluation."); 3148 return false; 3149 } 3150 else if (log && log->GetVerbose()) 3151 { 3152 size_t count = stack.size(); 3153 log->Printf("Stack after operation has %lu values:", count); 3154 for (size_t i=0; i<count; ++i) 3155 { 3156 StreamString new_value; 3157 new_value.Printf("[%zu]", i); 3158 stack[i].Dump(&new_value); 3159 log->Printf(" %s", new_value.GetData()); 3160 } 3161 } 3162 3163 result = stack.back(); 3164 return true; // Return true on success 3165 } 3166 3167