DWARFExpression.cpp revision 54e7afa84d945f9137f9372ecde432f9e1a702fc
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/dwarf.h" 15#include "lldb/Core/Log.h" 16#include "lldb/Core/StreamString.h" 17#include "lldb/Core/Scalar.h" 18#include "lldb/Core/Value.h" 19 20#include "lldb/Expression/ClangExpressionDeclMap.h" 21#include "lldb/Expression/ClangExpressionVariable.h" 22 23#include "lldb/Host/Host.h" 24 25#include "lldb/lldb-private-log.h" 26 27#include "lldb/Symbol/ClangASTContext.h" 28#include "lldb/Symbol/Type.h" 29 30#include "lldb/Target/ExecutionContext.h" 31#include "lldb/Target/Process.h" 32#include "lldb/Target/RegisterContext.h" 33#include "lldb/Target/StackFrame.h" 34 35using namespace lldb; 36using namespace lldb_private; 37 38const char * 39DW_OP_value_to_name (uint32_t val) 40{ 41 static char invalid[100]; 42 switch (val) { 43 case 0x03: return "DW_OP_addr"; 44 case 0x06: return "DW_OP_deref"; 45 case 0x08: return "DW_OP_const1u"; 46 case 0x09: return "DW_OP_const1s"; 47 case 0x0a: return "DW_OP_const2u"; 48 case 0x0b: return "DW_OP_const2s"; 49 case 0x0c: return "DW_OP_const4u"; 50 case 0x0d: return "DW_OP_const4s"; 51 case 0x0e: return "DW_OP_const8u"; 52 case 0x0f: return "DW_OP_const8s"; 53 case 0x10: return "DW_OP_constu"; 54 case 0x11: return "DW_OP_consts"; 55 case 0x12: return "DW_OP_dup"; 56 case 0x13: return "DW_OP_drop"; 57 case 0x14: return "DW_OP_over"; 58 case 0x15: return "DW_OP_pick"; 59 case 0x16: return "DW_OP_swap"; 60 case 0x17: return "DW_OP_rot"; 61 case 0x18: return "DW_OP_xderef"; 62 case 0x19: return "DW_OP_abs"; 63 case 0x1a: return "DW_OP_and"; 64 case 0x1b: return "DW_OP_div"; 65 case 0x1c: return "DW_OP_minus"; 66 case 0x1d: return "DW_OP_mod"; 67 case 0x1e: return "DW_OP_mul"; 68 case 0x1f: return "DW_OP_neg"; 69 case 0x20: return "DW_OP_not"; 70 case 0x21: return "DW_OP_or"; 71 case 0x22: return "DW_OP_plus"; 72 case 0x23: return "DW_OP_plus_uconst"; 73 case 0x24: return "DW_OP_shl"; 74 case 0x25: return "DW_OP_shr"; 75 case 0x26: return "DW_OP_shra"; 76 case 0x27: return "DW_OP_xor"; 77 case 0x2f: return "DW_OP_skip"; 78 case 0x28: return "DW_OP_bra"; 79 case 0x29: return "DW_OP_eq"; 80 case 0x2a: return "DW_OP_ge"; 81 case 0x2b: return "DW_OP_gt"; 82 case 0x2c: return "DW_OP_le"; 83 case 0x2d: return "DW_OP_lt"; 84 case 0x2e: return "DW_OP_ne"; 85 case 0x30: return "DW_OP_lit0"; 86 case 0x31: return "DW_OP_lit1"; 87 case 0x32: return "DW_OP_lit2"; 88 case 0x33: return "DW_OP_lit3"; 89 case 0x34: return "DW_OP_lit4"; 90 case 0x35: return "DW_OP_lit5"; 91 case 0x36: return "DW_OP_lit6"; 92 case 0x37: return "DW_OP_lit7"; 93 case 0x38: return "DW_OP_lit8"; 94 case 0x39: return "DW_OP_lit9"; 95 case 0x3a: return "DW_OP_lit10"; 96 case 0x3b: return "DW_OP_lit11"; 97 case 0x3c: return "DW_OP_lit12"; 98 case 0x3d: return "DW_OP_lit13"; 99 case 0x3e: return "DW_OP_lit14"; 100 case 0x3f: return "DW_OP_lit15"; 101 case 0x40: return "DW_OP_lit16"; 102 case 0x41: return "DW_OP_lit17"; 103 case 0x42: return "DW_OP_lit18"; 104 case 0x43: return "DW_OP_lit19"; 105 case 0x44: return "DW_OP_lit20"; 106 case 0x45: return "DW_OP_lit21"; 107 case 0x46: return "DW_OP_lit22"; 108 case 0x47: return "DW_OP_lit23"; 109 case 0x48: return "DW_OP_lit24"; 110 case 0x49: return "DW_OP_lit25"; 111 case 0x4a: return "DW_OP_lit26"; 112 case 0x4b: return "DW_OP_lit27"; 113 case 0x4c: return "DW_OP_lit28"; 114 case 0x4d: return "DW_OP_lit29"; 115 case 0x4e: return "DW_OP_lit30"; 116 case 0x4f: return "DW_OP_lit31"; 117 case 0x50: return "DW_OP_reg0"; 118 case 0x51: return "DW_OP_reg1"; 119 case 0x52: return "DW_OP_reg2"; 120 case 0x53: return "DW_OP_reg3"; 121 case 0x54: return "DW_OP_reg4"; 122 case 0x55: return "DW_OP_reg5"; 123 case 0x56: return "DW_OP_reg6"; 124 case 0x57: return "DW_OP_reg7"; 125 case 0x58: return "DW_OP_reg8"; 126 case 0x59: return "DW_OP_reg9"; 127 case 0x5a: return "DW_OP_reg10"; 128 case 0x5b: return "DW_OP_reg11"; 129 case 0x5c: return "DW_OP_reg12"; 130 case 0x5d: return "DW_OP_reg13"; 131 case 0x5e: return "DW_OP_reg14"; 132 case 0x5f: return "DW_OP_reg15"; 133 case 0x60: return "DW_OP_reg16"; 134 case 0x61: return "DW_OP_reg17"; 135 case 0x62: return "DW_OP_reg18"; 136 case 0x63: return "DW_OP_reg19"; 137 case 0x64: return "DW_OP_reg20"; 138 case 0x65: return "DW_OP_reg21"; 139 case 0x66: return "DW_OP_reg22"; 140 case 0x67: return "DW_OP_reg23"; 141 case 0x68: return "DW_OP_reg24"; 142 case 0x69: return "DW_OP_reg25"; 143 case 0x6a: return "DW_OP_reg26"; 144 case 0x6b: return "DW_OP_reg27"; 145 case 0x6c: return "DW_OP_reg28"; 146 case 0x6d: return "DW_OP_reg29"; 147 case 0x6e: return "DW_OP_reg30"; 148 case 0x6f: return "DW_OP_reg31"; 149 case 0x70: return "DW_OP_breg0"; 150 case 0x71: return "DW_OP_breg1"; 151 case 0x72: return "DW_OP_breg2"; 152 case 0x73: return "DW_OP_breg3"; 153 case 0x74: return "DW_OP_breg4"; 154 case 0x75: return "DW_OP_breg5"; 155 case 0x76: return "DW_OP_breg6"; 156 case 0x77: return "DW_OP_breg7"; 157 case 0x78: return "DW_OP_breg8"; 158 case 0x79: return "DW_OP_breg9"; 159 case 0x7a: return "DW_OP_breg10"; 160 case 0x7b: return "DW_OP_breg11"; 161 case 0x7c: return "DW_OP_breg12"; 162 case 0x7d: return "DW_OP_breg13"; 163 case 0x7e: return "DW_OP_breg14"; 164 case 0x7f: return "DW_OP_breg15"; 165 case 0x80: return "DW_OP_breg16"; 166 case 0x81: return "DW_OP_breg17"; 167 case 0x82: return "DW_OP_breg18"; 168 case 0x83: return "DW_OP_breg19"; 169 case 0x84: return "DW_OP_breg20"; 170 case 0x85: return "DW_OP_breg21"; 171 case 0x86: return "DW_OP_breg22"; 172 case 0x87: return "DW_OP_breg23"; 173 case 0x88: return "DW_OP_breg24"; 174 case 0x89: return "DW_OP_breg25"; 175 case 0x8a: return "DW_OP_breg26"; 176 case 0x8b: return "DW_OP_breg27"; 177 case 0x8c: return "DW_OP_breg28"; 178 case 0x8d: return "DW_OP_breg29"; 179 case 0x8e: return "DW_OP_breg30"; 180 case 0x8f: return "DW_OP_breg31"; 181 case 0x90: return "DW_OP_regx"; 182 case 0x91: return "DW_OP_fbreg"; 183 case 0x92: return "DW_OP_bregx"; 184 case 0x93: return "DW_OP_piece"; 185 case 0x94: return "DW_OP_deref_size"; 186 case 0x95: return "DW_OP_xderef_size"; 187 case 0x96: return "DW_OP_nop"; 188 case 0x97: return "DW_OP_push_object_address"; 189 case 0x98: return "DW_OP_call2"; 190 case 0x99: return "DW_OP_call4"; 191 case 0x9a: return "DW_OP_call_ref"; 192 case DW_OP_APPLE_array_ref: return "DW_OP_APPLE_array_ref"; 193 case DW_OP_APPLE_extern: return "DW_OP_APPLE_extern"; 194 case DW_OP_APPLE_uninit: return "DW_OP_APPLE_uninit"; 195 case DW_OP_APPLE_assign: return "DW_OP_APPLE_assign"; 196 case DW_OP_APPLE_address_of: return "DW_OP_APPLE_address_of"; 197 case DW_OP_APPLE_value_of: return "DW_OP_APPLE_value_of"; 198 case DW_OP_APPLE_deref_type: return "DW_OP_APPLE_deref_type"; 199 case DW_OP_APPLE_expr_local: return "DW_OP_APPLE_expr_local"; 200 case DW_OP_APPLE_constf: return "DW_OP_APPLE_constf"; 201 case DW_OP_APPLE_scalar_cast: return "DW_OP_APPLE_scalar_cast"; 202 case DW_OP_APPLE_clang_cast: return "DW_OP_APPLE_clang_cast"; 203 case DW_OP_APPLE_clear: return "DW_OP_APPLE_clear"; 204 case DW_OP_APPLE_error: return "DW_OP_APPLE_error"; 205 default: 206 snprintf (invalid, sizeof(invalid), "Unknown DW_OP constant: 0x%x", val); 207 return invalid; 208 } 209} 210 211 212//---------------------------------------------------------------------- 213// DWARFExpression constructor 214//---------------------------------------------------------------------- 215DWARFExpression::DWARFExpression() : 216 m_data(), 217 m_reg_kind (eRegisterKindDWARF), 218 m_loclist_base_addr(), 219 m_expr_locals (NULL), 220 m_decl_map (NULL) 221{ 222} 223 224DWARFExpression::DWARFExpression(const DWARFExpression& rhs) : 225 m_data(rhs.m_data), 226 m_reg_kind (rhs.m_reg_kind), 227 m_loclist_base_addr(rhs.m_loclist_base_addr), 228 m_expr_locals (rhs.m_expr_locals), 229 m_decl_map (rhs.m_decl_map) 230{ 231} 232 233 234DWARFExpression::DWARFExpression(const DataExtractor& data, uint32_t data_offset, uint32_t data_length, const Address* loclist_base_addr_ptr) : 235 m_data(data, data_offset, data_length), 236 m_reg_kind (eRegisterKindDWARF), 237 m_loclist_base_addr(), 238 m_expr_locals (NULL), 239 m_decl_map (NULL) 240{ 241 if (loclist_base_addr_ptr) 242 m_loclist_base_addr = *loclist_base_addr_ptr; 243} 244 245//---------------------------------------------------------------------- 246// Destructor 247//---------------------------------------------------------------------- 248DWARFExpression::~DWARFExpression() 249{ 250} 251 252 253bool 254DWARFExpression::IsValid() const 255{ 256 return m_data.GetByteSize() > 0; 257} 258 259 260void 261DWARFExpression::SetExpressionLocalVariableList (ClangExpressionVariableList *locals) 262{ 263 m_expr_locals = locals; 264} 265 266void 267DWARFExpression::SetExpressionDeclMap (ClangExpressionDeclMap *decl_map) 268{ 269 m_decl_map = decl_map; 270} 271 272void 273DWARFExpression::SetOpcodeData (const DataExtractor& data, const Address* loclist_base_addr_ptr) 274{ 275 m_data = data; 276 if (loclist_base_addr_ptr != NULL) 277 m_loclist_base_addr = *loclist_base_addr_ptr; 278 else 279 m_loclist_base_addr.Clear(); 280} 281 282void 283DWARFExpression::SetOpcodeData (const DataExtractor& data, uint32_t data_offset, uint32_t data_length, const Address* loclist_base_addr_ptr) 284{ 285 m_data.SetData(data, data_offset, data_length); 286 if (loclist_base_addr_ptr != NULL) 287 m_loclist_base_addr = *loclist_base_addr_ptr; 288 else 289 m_loclist_base_addr.Clear(); 290} 291 292void 293DWARFExpression::DumpLocation (Stream *s, uint32_t offset, uint32_t length, lldb::DescriptionLevel level) const 294{ 295 if (!m_data.ValidOffsetForDataOfSize(offset, length)) 296 return; 297 const uint32_t start_offset = offset; 298 const uint32_t end_offset = offset + length; 299 while (m_data.ValidOffset(offset) && offset < end_offset) 300 { 301 const uint32_t op_offset = offset; 302 const uint8_t op = m_data.GetU8(&offset); 303 304 switch (level) 305 { 306 default: 307 break; 308 309 case lldb::eDescriptionLevelBrief: 310 if (offset > start_offset) 311 s->PutChar(' '); 312 break; 313 314 case lldb::eDescriptionLevelFull: 315 case lldb::eDescriptionLevelVerbose: 316 if (offset > start_offset) 317 s->EOL(); 318 s->Indent(); 319 if (level == lldb::eDescriptionLevelFull) 320 break; 321 // Fall through for verbose and print offset and DW_OP prefix.. 322 s->Printf("0x%8.8x: %s", op_offset, op >= DW_OP_APPLE_uninit ? "DW_OP_APPLE_" : "DW_OP_"); 323 break; 324 } 325 326 switch (op) 327 { 328 case DW_OP_addr: *s << "addr(" << m_data.GetAddress(&offset) << ") "; break; // 0x03 1 address 329 case DW_OP_deref: *s << "deref"; break; // 0x06 330 case DW_OP_const1u: s->Printf("const1u(0x%2.2x) ", m_data.GetU8(&offset)); break; // 0x08 1 1-byte constant 331 case DW_OP_const1s: s->Printf("const1s(0x%2.2x) ", m_data.GetU8(&offset)); break; // 0x09 1 1-byte constant 332 case DW_OP_const2u: s->Printf("const2u(0x%4.4x) ", m_data.GetU16(&offset)); break; // 0x0a 1 2-byte constant 333 case DW_OP_const2s: s->Printf("const2s(0x%4.4x) ", m_data.GetU16(&offset)); break; // 0x0b 1 2-byte constant 334 case DW_OP_const4u: s->Printf("const4u(0x%8.8x) ", m_data.GetU32(&offset)); break; // 0x0c 1 4-byte constant 335 case DW_OP_const4s: s->Printf("const4s(0x%8.8x) ", m_data.GetU32(&offset)); break; // 0x0d 1 4-byte constant 336 case DW_OP_const8u: s->Printf("const8u(0x%16.16llx) ", m_data.GetU64(&offset)); break; // 0x0e 1 8-byte constant 337 case DW_OP_const8s: s->Printf("const8s(0x%16.16llx) ", m_data.GetU64(&offset)); break; // 0x0f 1 8-byte constant 338 case DW_OP_constu: s->Printf("constu(0x%x) ", m_data.GetULEB128(&offset)); break; // 0x10 1 ULEB128 constant 339 case DW_OP_consts: s->Printf("consts(0x%x) ", m_data.GetSLEB128(&offset)); break; // 0x11 1 SLEB128 constant 340 case DW_OP_dup: s->PutCString("dup"); break; // 0x12 341 case DW_OP_drop: s->PutCString("drop"); break; // 0x13 342 case DW_OP_over: s->PutCString("over"); break; // 0x14 343 case DW_OP_pick: s->Printf("pick(0x%2.2x) ", m_data.GetU8(&offset)); break; // 0x15 1 1-byte stack index 344 case DW_OP_swap: s->PutCString("swap"); break; // 0x16 345 case DW_OP_rot: s->PutCString("rot"); break; // 0x17 346 case DW_OP_xderef: s->PutCString("xderef"); break; // 0x18 347 case DW_OP_abs: s->PutCString("abs"); break; // 0x19 348 case DW_OP_and: s->PutCString("and"); break; // 0x1a 349 case DW_OP_div: s->PutCString("div"); break; // 0x1b 350 case DW_OP_minus: s->PutCString("minus"); break; // 0x1c 351 case DW_OP_mod: s->PutCString("mod"); break; // 0x1d 352 case DW_OP_mul: s->PutCString("mul"); break; // 0x1e 353 case DW_OP_neg: s->PutCString("neg"); break; // 0x1f 354 case DW_OP_not: s->PutCString("not"); break; // 0x20 355 case DW_OP_or: s->PutCString("or"); break; // 0x21 356 case DW_OP_plus: s->PutCString("plus"); break; // 0x22 357 case DW_OP_plus_uconst: // 0x23 1 ULEB128 addend 358 s->Printf("plus_uconst(0x%x) ", m_data.GetULEB128(&offset)); 359 break; 360 361 case DW_OP_shl: s->PutCString("shl"); break; // 0x24 362 case DW_OP_shr: s->PutCString("shr"); break; // 0x25 363 case DW_OP_shra: s->PutCString("shra"); break; // 0x26 364 case DW_OP_xor: s->PutCString("xor"); break; // 0x27 365 case DW_OP_skip: s->Printf("skip(0x%4.4x)", m_data.GetU16(&offset)); break; // 0x2f 1 signed 2-byte constant 366 case DW_OP_bra: s->Printf("bra(0x%4.4x)", m_data.GetU16(&offset)); break; // 0x28 1 signed 2-byte constant 367 case DW_OP_eq: s->PutCString("eq"); break; // 0x29 368 case DW_OP_ge: s->PutCString("ge"); break; // 0x2a 369 case DW_OP_gt: s->PutCString("gt"); break; // 0x2b 370 case DW_OP_le: s->PutCString("le"); break; // 0x2c 371 case DW_OP_lt: s->PutCString("lt"); break; // 0x2d 372 case DW_OP_ne: s->PutCString("ne"); break; // 0x2e 373 374 case DW_OP_lit0: // 0x30 375 case DW_OP_lit1: // 0x31 376 case DW_OP_lit2: // 0x32 377 case DW_OP_lit3: // 0x33 378 case DW_OP_lit4: // 0x34 379 case DW_OP_lit5: // 0x35 380 case DW_OP_lit6: // 0x36 381 case DW_OP_lit7: // 0x37 382 case DW_OP_lit8: // 0x38 383 case DW_OP_lit9: // 0x39 384 case DW_OP_lit10: // 0x3A 385 case DW_OP_lit11: // 0x3B 386 case DW_OP_lit12: // 0x3C 387 case DW_OP_lit13: // 0x3D 388 case DW_OP_lit14: // 0x3E 389 case DW_OP_lit15: // 0x3F 390 case DW_OP_lit16: // 0x40 391 case DW_OP_lit17: // 0x41 392 case DW_OP_lit18: // 0x42 393 case DW_OP_lit19: // 0x43 394 case DW_OP_lit20: // 0x44 395 case DW_OP_lit21: // 0x45 396 case DW_OP_lit22: // 0x46 397 case DW_OP_lit23: // 0x47 398 case DW_OP_lit24: // 0x48 399 case DW_OP_lit25: // 0x49 400 case DW_OP_lit26: // 0x4A 401 case DW_OP_lit27: // 0x4B 402 case DW_OP_lit28: // 0x4C 403 case DW_OP_lit29: // 0x4D 404 case DW_OP_lit30: // 0x4E 405 case DW_OP_lit31: s->Printf("lit%i", op - DW_OP_lit0); break; // 0x4f 406 407 case DW_OP_reg0: // 0x50 408 case DW_OP_reg1: // 0x51 409 case DW_OP_reg2: // 0x52 410 case DW_OP_reg3: // 0x53 411 case DW_OP_reg4: // 0x54 412 case DW_OP_reg5: // 0x55 413 case DW_OP_reg6: // 0x56 414 case DW_OP_reg7: // 0x57 415 case DW_OP_reg8: // 0x58 416 case DW_OP_reg9: // 0x59 417 case DW_OP_reg10: // 0x5A 418 case DW_OP_reg11: // 0x5B 419 case DW_OP_reg12: // 0x5C 420 case DW_OP_reg13: // 0x5D 421 case DW_OP_reg14: // 0x5E 422 case DW_OP_reg15: // 0x5F 423 case DW_OP_reg16: // 0x60 424 case DW_OP_reg17: // 0x61 425 case DW_OP_reg18: // 0x62 426 case DW_OP_reg19: // 0x63 427 case DW_OP_reg20: // 0x64 428 case DW_OP_reg21: // 0x65 429 case DW_OP_reg22: // 0x66 430 case DW_OP_reg23: // 0x67 431 case DW_OP_reg24: // 0x68 432 case DW_OP_reg25: // 0x69 433 case DW_OP_reg26: // 0x6A 434 case DW_OP_reg27: // 0x6B 435 case DW_OP_reg28: // 0x6C 436 case DW_OP_reg29: // 0x6D 437 case DW_OP_reg30: // 0x6E 438 case DW_OP_reg31: s->Printf("reg%i", op - DW_OP_reg0); break; // 0x6f 439 440 case DW_OP_breg0: 441 case DW_OP_breg1: 442 case DW_OP_breg2: 443 case DW_OP_breg3: 444 case DW_OP_breg4: 445 case DW_OP_breg5: 446 case DW_OP_breg6: 447 case DW_OP_breg7: 448 case DW_OP_breg8: 449 case DW_OP_breg9: 450 case DW_OP_breg10: 451 case DW_OP_breg11: 452 case DW_OP_breg12: 453 case DW_OP_breg13: 454 case DW_OP_breg14: 455 case DW_OP_breg15: 456 case DW_OP_breg16: 457 case DW_OP_breg17: 458 case DW_OP_breg18: 459 case DW_OP_breg19: 460 case DW_OP_breg20: 461 case DW_OP_breg21: 462 case DW_OP_breg22: 463 case DW_OP_breg23: 464 case DW_OP_breg24: 465 case DW_OP_breg25: 466 case DW_OP_breg26: 467 case DW_OP_breg27: 468 case DW_OP_breg28: 469 case DW_OP_breg29: 470 case DW_OP_breg30: 471 case DW_OP_breg31: s->Printf("breg%i(0x%x)", op - DW_OP_breg0, m_data.GetULEB128(&offset)); break; 472 473 case DW_OP_regx: // 0x90 1 ULEB128 register 474 s->Printf("regx(0x%x)", m_data.GetULEB128(&offset)); 475 break; 476 case DW_OP_fbreg: // 0x91 1 SLEB128 offset 477 s->Printf("fbreg(0x%x)",m_data.GetSLEB128(&offset)); 478 break; 479 case DW_OP_bregx: // 0x92 2 ULEB128 register followed by SLEB128 offset 480 s->Printf("bregx(0x%x, 0x%x)", m_data.GetULEB128(&offset), m_data.GetSLEB128(&offset)); 481 break; 482 case DW_OP_piece: // 0x93 1 ULEB128 size of piece addressed 483 s->Printf("piece(0x%x)", m_data.GetULEB128(&offset)); 484 break; 485 case DW_OP_deref_size: // 0x94 1 1-byte size of data retrieved 486 s->Printf("deref_size(0x%2.2x)", m_data.GetU8(&offset)); 487 break; 488 case DW_OP_xderef_size: // 0x95 1 1-byte size of data retrieved 489 s->Printf("xderef_size(0x%2.2x)", m_data.GetU8(&offset)); 490 break; 491 case DW_OP_nop: s->PutCString("nop"); break; // 0x96 492 case DW_OP_push_object_address: s->PutCString("push_object_address"); break; // 0x97 DWARF3 493 case DW_OP_call2: // 0x98 DWARF3 1 2-byte offset of DIE 494 s->Printf("call2(0x%4.4x)", m_data.GetU16(&offset)); 495 break; 496 case DW_OP_call4: // 0x99 DWARF3 1 4-byte offset of DIE 497 s->Printf("call4(0x%8.8x)", m_data.GetU32(&offset)); 498 break; 499 case DW_OP_call_ref: // 0x9a DWARF3 1 4- or 8-byte offset of DIE 500 s->Printf("call_ref(0x%8.8llx)", m_data.GetAddress(&offset)); 501 break; 502// case DW_OP_form_tls_address: s << "form_tls_address"; break; // 0x9b DWARF3 503// case DW_OP_call_frame_cfa: s << "call_frame_cfa"; break; // 0x9c DWARF3 504// case DW_OP_bit_piece: // 0x9d DWARF3 2 505// s->Printf("bit_piece(0x%x, 0x%x)", m_data.GetULEB128(&offset), m_data.GetULEB128(&offset)); 506// break; 507// case DW_OP_lo_user: s->PutCString("lo_user"); break; // 0xe0 508// case DW_OP_hi_user: s->PutCString("hi_user"); break; // 0xff 509 case DW_OP_APPLE_extern: 510 s->Printf("extern(%u)", m_data.GetULEB128(&offset)); 511 break; 512 case DW_OP_APPLE_array_ref: 513 s->PutCString("array_ref"); 514 break; 515 case DW_OP_APPLE_uninit: 516 s->PutCString("uninit"); // 0xF0 517 break; 518 case DW_OP_APPLE_assign: // 0xF1 - pops value off and assigns it to second item on stack (2nd item must have assignable context) 519 s->PutCString("assign"); 520 break; 521 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) 522 s->PutCString("address_of"); 523 break; 524 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) 525 s->PutCString("value_of"); 526 break; 527 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) 528 s->PutCString("deref_type"); 529 break; 530 case DW_OP_APPLE_expr_local: // 0xF5 - ULEB128 expression local index 531 s->Printf("expr_local(%u)", m_data.GetULEB128(&offset)); 532 break; 533 case DW_OP_APPLE_constf: // 0xF6 - 1 byte float size, followed by constant float data 534 { 535 uint8_t float_length = m_data.GetU8(&offset); 536 s->Printf("constf(<%u> ", float_length); 537 m_data.Dump(s, offset, eFormatHex, float_length, 1, UINT32_MAX, DW_INVALID_ADDRESS, 0, 0); 538 s->PutChar(')'); 539 // Consume the float data 540 m_data.GetData(&offset, float_length); 541 } 542 break; 543 case DW_OP_APPLE_scalar_cast: 544 s->Printf("scalar_cast(%s)", Scalar::GetValueTypeAsCString ((Scalar::Type)m_data.GetU8(&offset))); 545 break; 546 case DW_OP_APPLE_clang_cast: 547 { 548 clang::Type *clang_type = (clang::Type *)m_data.GetMaxU64(&offset, sizeof(void*)); 549 s->Printf("clang_cast(%p)", clang_type); 550 } 551 break; 552 case DW_OP_APPLE_clear: 553 s->PutCString("clear"); 554 break; 555 case DW_OP_APPLE_error: // 0xFF - Stops expression evaluation and returns an error (no args) 556 s->PutCString("error"); 557 break; 558 } 559 } 560} 561 562void 563DWARFExpression::SetLocationListBaseAddress(Address& base_addr) 564{ 565 m_loclist_base_addr = base_addr; 566} 567 568int 569DWARFExpression::GetRegisterKind () 570{ 571 return m_reg_kind; 572} 573 574void 575DWARFExpression::SetRegisterKind (int reg_kind) 576{ 577 m_reg_kind = reg_kind; 578} 579 580bool 581DWARFExpression::IsLocationList() const 582{ 583 return m_loclist_base_addr.IsSectionOffset(); 584} 585 586void 587DWARFExpression::GetDescription (Stream *s, lldb::DescriptionLevel level) const 588{ 589 if (IsLocationList()) 590 { 591 // We have a location list 592 uint32_t offset = 0; 593 uint32_t count = 0; 594 Address base_addr(m_loclist_base_addr); 595 while (m_data.ValidOffset(offset)) 596 { 597 lldb::addr_t begin_addr_offset = m_data.GetAddress(&offset); 598 lldb::addr_t end_addr_offset = m_data.GetAddress(&offset); 599 if (begin_addr_offset < end_addr_offset) 600 { 601 if (count > 0) 602 s->PutCString(", "); 603 AddressRange addr_range(base_addr, end_addr_offset - begin_addr_offset); 604 addr_range.GetBaseAddress().SetOffset(base_addr.GetOffset() + begin_addr_offset); 605 addr_range.Dump (s, NULL, Address::DumpStyleFileAddress); 606 s->PutChar('{'); 607 uint32_t location_length = m_data.GetU16(&offset); 608 DumpLocation (s, offset, location_length, level); 609 s->PutChar('}'); 610 offset += location_length; 611 } 612 else if (begin_addr_offset == 0 && end_addr_offset == 0) 613 { 614 // The end of the location list is marked by both the start and end offset being zero 615 break; 616 } 617 else 618 { 619 if (m_data.GetAddressByteSize() == 4 && begin_addr_offset == 0xFFFFFFFFull || 620 m_data.GetAddressByteSize() == 8 && begin_addr_offset == 0xFFFFFFFFFFFFFFFFull) 621 { 622 // We have a new base address 623 if (count > 0) 624 s->PutCString(", "); 625 *s << "base_addr = " << end_addr_offset; 626 } 627 } 628 629 count++; 630 } 631 } 632 else 633 { 634 // We have a normal location that contains DW_OP location opcodes 635 DumpLocation (s, 0, m_data.GetByteSize(), level); 636 } 637} 638 639static bool 640ReadRegisterValueAsScalar 641( 642 ExecutionContext *exe_ctx, 643 uint32_t reg_kind, 644 uint32_t reg_num, 645 Error *error_ptr, 646 Value &value 647) 648{ 649 if (exe_ctx && exe_ctx->frame) 650 { 651 RegisterContext *reg_context = exe_ctx->frame->GetRegisterContext(); 652 653 if (reg_context == NULL) 654 { 655 if (error_ptr) 656 error_ptr->SetErrorStringWithFormat("No register context in frame.\n"); 657 } 658 else 659 { 660 uint32_t native_reg = reg_context->ConvertRegisterKindToRegisterNumber(reg_kind, reg_num); 661 if (native_reg == LLDB_INVALID_REGNUM) 662 { 663 if (error_ptr) 664 error_ptr->SetErrorStringWithFormat("Unable to convert register kind=%u reg_num=%u to a native register number.\n", reg_kind, reg_num); 665 } 666 else 667 { 668 value.SetValueType (Value::eValueTypeScalar); 669 value.SetContext (Value::eContextTypeDCRegisterInfo, const_cast<RegisterInfo *>(reg_context->GetRegisterInfoAtIndex(native_reg))); 670 671 if (reg_context->ReadRegisterValue (native_reg, value.GetScalar())) 672 return true; 673 674 if (error_ptr) 675 error_ptr->SetErrorStringWithFormat("Failed to read register %u.\n", native_reg); 676 } 677 } 678 } 679 else 680 { 681 if (error_ptr) 682 error_ptr->SetErrorStringWithFormat("Invalid frame in execution context.\n"); 683 } 684 return false; 685} 686 687bool 688DWARFExpression::LocationListContainsLoadAddress (Process* process, const Address &addr) const 689{ 690 if (IsLocationList()) 691 { 692 uint32_t offset = 0; 693 const addr_t load_addr = addr.GetLoadAddress(process); 694 695 if (load_addr == LLDB_INVALID_ADDRESS) 696 return false; 697 698 addr_t loc_list_base_addr = m_loclist_base_addr.GetLoadAddress(process); 699 700 if (loc_list_base_addr == LLDB_INVALID_ADDRESS) 701 return false; 702 703 while (m_data.ValidOffset(offset)) 704 { 705 // We need to figure out what the value is for the location. 706 addr_t lo_pc = m_data.GetAddress(&offset); 707 addr_t hi_pc = m_data.GetAddress(&offset); 708 if (lo_pc == 0 && hi_pc == 0) 709 break; 710 else 711 { 712 lo_pc += loc_list_base_addr; 713 hi_pc += loc_list_base_addr; 714 715 if (lo_pc <= load_addr && load_addr < hi_pc) 716 return true; 717 718 offset += m_data.GetU16(&offset); 719 } 720 } 721 } 722 return false; 723} 724bool 725DWARFExpression::Evaluate 726( 727 ExecutionContextScope *exe_scope, 728 clang::ASTContext *ast_context, 729 const Value* initial_value_ptr, 730 Value& result, 731 Error *error_ptr 732) const 733{ 734 ExecutionContext exe_ctx (exe_scope); 735 return Evaluate(&exe_ctx, ast_context, initial_value_ptr, result, error_ptr); 736} 737 738bool 739DWARFExpression::Evaluate 740( 741 ExecutionContext *exe_ctx, 742 clang::ASTContext *ast_context, 743 const Value* initial_value_ptr, 744 Value& result, 745 Error *error_ptr 746) const 747{ 748 if (IsLocationList()) 749 { 750 uint32_t offset = 0; 751 addr_t pc = exe_ctx->frame->GetPC().GetLoadAddress(exe_ctx->process); 752 753 if (pc == LLDB_INVALID_ADDRESS) 754 { 755 if (error_ptr) 756 error_ptr->SetErrorString("Invalid PC in frame."); 757 return false; 758 } 759 760 addr_t loc_list_base_addr = m_loclist_base_addr.GetLoadAddress(exe_ctx->process); 761 762 if (loc_list_base_addr == LLDB_INVALID_ADDRESS) 763 { 764 if (error_ptr) 765 error_ptr->SetErrorString("Out of scope."); 766 return false; 767 } 768 769 while (m_data.ValidOffset(offset)) 770 { 771 // We need to figure out what the value is for the location. 772 addr_t lo_pc = m_data.GetAddress(&offset); 773 addr_t hi_pc = m_data.GetAddress(&offset); 774 if (lo_pc == 0 && hi_pc == 0) 775 { 776 break; 777 } 778 else 779 { 780 lo_pc += loc_list_base_addr; 781 hi_pc += loc_list_base_addr; 782 783 uint16_t length = m_data.GetU16(&offset); 784 785 if (length > 0 && lo_pc <= pc && pc < hi_pc) 786 { 787 return DWARFExpression::Evaluate (exe_ctx, ast_context, m_data, m_expr_locals, m_decl_map, offset, length, m_reg_kind, initial_value_ptr, result, error_ptr); 788 } 789 offset += length; 790 } 791 } 792 if (error_ptr) 793 error_ptr->SetErrorStringWithFormat("Out of scope.\n", pc); 794 return false; 795 } 796 797 // Not a location list, just a single expression. 798 return DWARFExpression::Evaluate (exe_ctx, ast_context, m_data, m_expr_locals, m_decl_map, 0, m_data.GetByteSize(), m_reg_kind, initial_value_ptr, result, error_ptr); 799} 800 801 802 803bool 804DWARFExpression::Evaluate 805( 806 ExecutionContext *exe_ctx, 807 clang::ASTContext *ast_context, 808 const DataExtractor& opcodes, 809 ClangExpressionVariableList *expr_locals, 810 ClangExpressionDeclMap *decl_map, 811 const uint32_t opcodes_offset, 812 const uint32_t opcodes_length, 813 const uint32_t reg_kind, 814 const Value* initial_value_ptr, 815 Value& result, 816 Error *error_ptr 817) 818{ 819 std::vector<Value> stack; 820 821 if (initial_value_ptr) 822 stack.push_back(*initial_value_ptr); 823 824 uint32_t offset = opcodes_offset; 825 const uint32_t end_offset = opcodes_offset + opcodes_length; 826 Value tmp; 827 uint32_t reg_num; 828 829 // Make sure all of the data is available in opcodes. 830 if (!opcodes.ValidOffsetForDataOfSize(opcodes_offset, opcodes_length)) 831 { 832 if (error_ptr) 833 error_ptr->SetErrorString ("Invalid offset and/or length for opcodes buffer."); 834 return false; 835 } 836 Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS); 837 838 839 while (opcodes.ValidOffset(offset) && offset < end_offset) 840 { 841 const uint32_t op_offset = offset; 842 const uint8_t op = opcodes.GetU8(&offset); 843 844 if (log) 845 { 846 size_t count = stack.size(); 847 log->Printf("Stack before operation has %d values:", count); 848 for (size_t i=0; i<count; ++i) 849 { 850 StreamString new_value; 851 new_value.Printf("[%zu]", i); 852 stack[i].Dump(&new_value); 853 log->Printf(" %s", new_value.GetData()); 854 } 855 log->Printf("0x%8.8x: %s", op_offset, DW_OP_value_to_name(op)); 856 } 857 switch (op) 858 { 859 //---------------------------------------------------------------------- 860 // The DW_OP_addr operation has a single operand that encodes a machine 861 // address and whose size is the size of an address on the target machine. 862 //---------------------------------------------------------------------- 863 case DW_OP_addr: 864 stack.push_back(opcodes.GetAddress(&offset)); 865 stack.back().SetValueType (Value::eValueTypeFileAddress); 866 break; 867 868 //---------------------------------------------------------------------- 869 // The DW_OP_addr_sect_offset4 is used for any location expressions in 870 // shared libraries that have a location like: 871 // DW_OP_addr(0x1000) 872 // If this address resides in a shared library, then this virtual 873 // address won't make sense when it is evaluated in the context of a 874 // running process where shared libraries have been slid. To account for 875 // this, this new address type where we can store the section pointer 876 // and a 4 byte offset. 877 //---------------------------------------------------------------------- 878// case DW_OP_addr_sect_offset4: 879// { 880// result_type = eResultTypeFileAddress; 881// lldb::Section *sect = (lldb::Section *)opcodes.GetMaxU64(&offset, sizeof(void *)); 882// lldb::addr_t sect_offset = opcodes.GetU32(&offset); 883// 884// Address so_addr (sect, sect_offset); 885// lldb::addr_t load_addr = so_addr.GetLoadAddress(); 886// if (load_addr != LLDB_INVALID_ADDRESS) 887// { 888// // We successfully resolve a file address to a load 889// // address. 890// stack.push_back(load_addr); 891// break; 892// } 893// else 894// { 895// // We were able 896// if (error_ptr) 897// error_ptr->SetErrorStringWithFormat ("Section %s in %s is not currently loaded.\n", sect->GetName().AsCString(), sect->GetModule()->GetFileSpec().GetFilename().AsCString()); 898// return false; 899// } 900// } 901// break; 902 903 //---------------------------------------------------------------------- 904 // OPCODE: DW_OP_deref 905 // OPERANDS: none 906 // DESCRIPTION: Pops the top stack entry and treats it as an address. 907 // The value retrieved from that address is pushed. The size of the 908 // data retrieved from the dereferenced address is the size of an 909 // address on the target machine. 910 //---------------------------------------------------------------------- 911 case DW_OP_deref: 912 { 913 Value::ValueType value_type = stack.back().GetValueType(); 914 switch (value_type) 915 { 916 case Value::eValueTypeHostAddress: 917 { 918 void *src = (void *)stack.back().GetScalar().ULongLong(); 919 intptr_t ptr; 920 ::memcpy (&ptr, src, sizeof(void *)); 921 stack.back().GetScalar() = ptr; 922 stack.back().ClearContext(); 923 } 924 break; 925 case Value::eValueTypeLoadAddress: 926 if (exe_ctx) 927 { 928 if (exe_ctx->process) 929 { 930 lldb::addr_t pointer_addr = stack.back().GetScalar().ULongLong(LLDB_INVALID_ADDRESS); 931 uint8_t addr_bytes[sizeof(lldb::addr_t)]; 932 uint32_t addr_size = exe_ctx->process->GetAddressByteSize(); 933 Error error; 934 if (exe_ctx->process->ReadMemory(pointer_addr, &addr_bytes, addr_size, error) == addr_size) 935 { 936 DataExtractor addr_data(addr_bytes, sizeof(addr_bytes), exe_ctx->process->GetByteOrder(), addr_size); 937 uint32_t addr_data_offset = 0; 938 stack.back().GetScalar() = addr_data.GetPointer(&addr_data_offset); 939 stack.back().ClearContext(); 940 } 941 else 942 { 943 if (error_ptr) 944 error_ptr->SetErrorStringWithFormat ("Failed to dereference pointer from 0x%llx for DW_OP_deref: %s\n", 945 pointer_addr, 946 error.AsCString()); 947 return false; 948 } 949 } 950 else 951 { 952 if (error_ptr) 953 error_ptr->SetErrorStringWithFormat ("NULL process for DW_OP_deref.\n"); 954 return false; 955 } 956 } 957 else 958 { 959 if (error_ptr) 960 error_ptr->SetErrorStringWithFormat ("NULL execution context for DW_OP_deref.\n"); 961 return false; 962 } 963 break; 964 965 default: 966 break; 967 } 968 969 } 970 break; 971 972 //---------------------------------------------------------------------- 973 // OPCODE: DW_OP_deref_size 974 // OPERANDS: 1 975 // 1 - uint8_t that specifies the size of the data to dereference. 976 // DESCRIPTION: Behaves like the DW_OP_deref operation: it pops the top 977 // stack entry and treats it as an address. The value retrieved from that 978 // address is pushed. In the DW_OP_deref_size operation, however, the 979 // size in bytes of the data retrieved from the dereferenced address is 980 // specified by the single operand. This operand is a 1-byte unsigned 981 // integral constant whose value may not be larger than the size of an 982 // address on the target machine. The data retrieved is zero extended 983 // to the size of an address on the target machine before being pushed 984 // on the expression stack. 985 //---------------------------------------------------------------------- 986 case DW_OP_deref_size: 987 if (error_ptr) 988 error_ptr->SetErrorString("Unimplemented opcode: DW_OP_deref_size."); 989 return false; 990 991 //---------------------------------------------------------------------- 992 // OPCODE: DW_OP_xderef_size 993 // OPERANDS: 1 994 // 1 - uint8_t that specifies the size of the data to dereference. 995 // DESCRIPTION: Behaves like the DW_OP_xderef operation: the entry at 996 // the top of the stack is treated as an address. The second stack 997 // entry is treated as an “address space identifier” for those 998 // architectures that support multiple address spaces. The top two 999 // stack elements are popped, a data item is retrieved through an 1000 // implementation-defined address calculation and pushed as the new 1001 // stack top. In the DW_OP_xderef_size operation, however, the size in 1002 // bytes of the data retrieved from the dereferenced address is 1003 // specified by the single operand. This operand is a 1-byte unsigned 1004 // integral constant whose value may not be larger than the size of an 1005 // address on the target machine. The data retrieved is zero extended 1006 // to the size of an address on the target machine before being pushed 1007 // on the expression stack. 1008 //---------------------------------------------------------------------- 1009 case DW_OP_xderef_size: 1010 if (error_ptr) 1011 error_ptr->SetErrorString("Unimplemented opcode: DW_OP_xderef_size."); 1012 return false; 1013 //---------------------------------------------------------------------- 1014 // OPCODE: DW_OP_xderef 1015 // OPERANDS: none 1016 // DESCRIPTION: Provides an extended dereference mechanism. The entry at 1017 // the top of the stack is treated as an address. The second stack entry 1018 // is treated as an "address space identifier" for those architectures 1019 // that support multiple address spaces. The top two stack elements are 1020 // popped, a data item is retrieved through an implementation-defined 1021 // address calculation and pushed as the new stack top. The size of the 1022 // data retrieved from the dereferenced address is the size of an address 1023 // on the target machine. 1024 //---------------------------------------------------------------------- 1025 case DW_OP_xderef: 1026 if (error_ptr) 1027 error_ptr->SetErrorString("Unimplemented opcode: DW_OP_xderef."); 1028 return false; 1029 1030 //---------------------------------------------------------------------- 1031 // All DW_OP_constXXX opcodes have a single operand as noted below: 1032 // 1033 // Opcode Operand 1 1034 // --------------- ---------------------------------------------------- 1035 // DW_OP_const1u 1-byte unsigned integer constant 1036 // DW_OP_const1s 1-byte signed integer constant 1037 // DW_OP_const2u 2-byte unsigned integer constant 1038 // DW_OP_const2s 2-byte signed integer constant 1039 // DW_OP_const4u 4-byte unsigned integer constant 1040 // DW_OP_const4s 4-byte signed integer constant 1041 // DW_OP_const8u 8-byte unsigned integer constant 1042 // DW_OP_const8s 8-byte signed integer constant 1043 // DW_OP_constu unsigned LEB128 integer constant 1044 // DW_OP_consts signed LEB128 integer constant 1045 //---------------------------------------------------------------------- 1046 case DW_OP_const1u : stack.push_back(( uint8_t)opcodes.GetU8(&offset)); break; 1047 case DW_OP_const1s : stack.push_back(( int8_t)opcodes.GetU8(&offset)); break; 1048 case DW_OP_const2u : stack.push_back((uint16_t)opcodes.GetU16(&offset)); break; 1049 case DW_OP_const2s : stack.push_back(( int16_t)opcodes.GetU16(&offset)); break; 1050 case DW_OP_const4u : stack.push_back((uint32_t)opcodes.GetU32(&offset)); break; 1051 case DW_OP_const4s : stack.push_back(( int32_t)opcodes.GetU32(&offset)); break; 1052 case DW_OP_const8u : stack.push_back((uint64_t)opcodes.GetU64(&offset)); break; 1053 case DW_OP_const8s : stack.push_back(( int64_t)opcodes.GetU64(&offset)); break; 1054 case DW_OP_constu : stack.push_back(opcodes.GetULEB128(&offset)); break; 1055 case DW_OP_consts : stack.push_back(opcodes.GetSLEB128(&offset)); break; 1056 1057 //---------------------------------------------------------------------- 1058 // OPCODE: DW_OP_dup 1059 // OPERANDS: none 1060 // DESCRIPTION: duplicates the value at the top of the stack 1061 //---------------------------------------------------------------------- 1062 case DW_OP_dup: 1063 if (stack.empty()) 1064 { 1065 if (error_ptr) 1066 error_ptr->SetErrorString("Expression stack empty for DW_OP_dup."); 1067 return false; 1068 } 1069 else 1070 stack.push_back(stack.back()); 1071 break; 1072 1073 //---------------------------------------------------------------------- 1074 // OPCODE: DW_OP_drop 1075 // OPERANDS: none 1076 // DESCRIPTION: pops the value at the top of the stack 1077 //---------------------------------------------------------------------- 1078 case DW_OP_drop: 1079 if (stack.empty()) 1080 { 1081 if (error_ptr) 1082 error_ptr->SetErrorString("Expression stack empty for DW_OP_drop."); 1083 return false; 1084 } 1085 else 1086 stack.pop_back(); 1087 break; 1088 1089 //---------------------------------------------------------------------- 1090 // OPCODE: DW_OP_over 1091 // OPERANDS: none 1092 // DESCRIPTION: Duplicates the entry currently second in the stack at 1093 // the top of the stack. 1094 //---------------------------------------------------------------------- 1095 case DW_OP_over: 1096 if (stack.size() < 2) 1097 { 1098 if (error_ptr) 1099 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_over."); 1100 return false; 1101 } 1102 else 1103 stack.push_back(stack[stack.size() - 2]); 1104 break; 1105 1106 1107 //---------------------------------------------------------------------- 1108 // OPCODE: DW_OP_pick 1109 // OPERANDS: uint8_t index into the current stack 1110 // DESCRIPTION: The stack entry with the specified index (0 through 255, 1111 // inclusive) is pushed on the stack 1112 //---------------------------------------------------------------------- 1113 case DW_OP_pick: 1114 { 1115 uint8_t pick_idx = opcodes.GetU8(&offset); 1116 if (pick_idx < stack.size()) 1117 stack.push_back(stack[pick_idx]); 1118 else 1119 { 1120 if (error_ptr) 1121 error_ptr->SetErrorStringWithFormat("Index %u out of range for DW_OP_pick.\n", pick_idx); 1122 return false; 1123 } 1124 } 1125 break; 1126 1127 //---------------------------------------------------------------------- 1128 // OPCODE: DW_OP_swap 1129 // OPERANDS: none 1130 // DESCRIPTION: swaps the top two stack entries. The entry at the top 1131 // of the stack becomes the second stack entry, and the second entry 1132 // becomes the top of the stack 1133 //---------------------------------------------------------------------- 1134 case DW_OP_swap: 1135 if (stack.size() < 2) 1136 { 1137 if (error_ptr) 1138 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_swap."); 1139 return false; 1140 } 1141 else 1142 { 1143 tmp = stack.back(); 1144 stack.back() = stack[stack.size() - 2]; 1145 stack[stack.size() - 2] = tmp; 1146 } 1147 break; 1148 1149 //---------------------------------------------------------------------- 1150 // OPCODE: DW_OP_rot 1151 // OPERANDS: none 1152 // DESCRIPTION: Rotates the first three stack entries. The entry at 1153 // the top of the stack becomes the third stack entry, the second 1154 // entry becomes the top of the stack, and the third entry becomes 1155 // the second entry. 1156 //---------------------------------------------------------------------- 1157 case DW_OP_rot: 1158 if (stack.size() < 3) 1159 { 1160 if (error_ptr) 1161 error_ptr->SetErrorString("Expression stack needs at least 3 items for DW_OP_rot."); 1162 return false; 1163 } 1164 else 1165 { 1166 size_t last_idx = stack.size() - 1; 1167 Value old_top = stack[last_idx]; 1168 stack[last_idx] = stack[last_idx - 1]; 1169 stack[last_idx - 1] = stack[last_idx - 2]; 1170 stack[last_idx - 2] = old_top; 1171 } 1172 break; 1173 1174 //---------------------------------------------------------------------- 1175 // OPCODE: DW_OP_abs 1176 // OPERANDS: none 1177 // DESCRIPTION: pops the top stack entry, interprets it as a signed 1178 // value and pushes its absolute value. If the absolute value can not be 1179 // represented, the result is undefined. 1180 //---------------------------------------------------------------------- 1181 case DW_OP_abs: 1182 if (stack.empty()) 1183 { 1184 if (error_ptr) 1185 error_ptr->SetErrorString("Expression stack needs at least 1 item for DW_OP_abs."); 1186 return false; 1187 } 1188 else if (stack.back().ResolveValue(exe_ctx, ast_context).AbsoluteValue() == false) 1189 { 1190 if (error_ptr) 1191 error_ptr->SetErrorString("Failed to take the absolute value of the first stack item."); 1192 return false; 1193 } 1194 break; 1195 1196 //---------------------------------------------------------------------- 1197 // OPCODE: DW_OP_and 1198 // OPERANDS: none 1199 // DESCRIPTION: pops the top two stack values, performs a bitwise and 1200 // operation on the two, and pushes the result. 1201 //---------------------------------------------------------------------- 1202 case DW_OP_and: 1203 if (stack.size() < 2) 1204 { 1205 if (error_ptr) 1206 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_and."); 1207 return false; 1208 } 1209 else 1210 { 1211 tmp = stack.back(); 1212 stack.pop_back(); 1213 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) & tmp.ResolveValue(exe_ctx, ast_context); 1214 } 1215 break; 1216 1217 //---------------------------------------------------------------------- 1218 // OPCODE: DW_OP_div 1219 // OPERANDS: none 1220 // DESCRIPTION: pops the top two stack values, divides the former second 1221 // entry by the former top of the stack using signed division, and 1222 // pushes the result. 1223 //---------------------------------------------------------------------- 1224 case DW_OP_div: 1225 if (stack.size() < 2) 1226 { 1227 if (error_ptr) 1228 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_div."); 1229 return false; 1230 } 1231 else 1232 { 1233 tmp = stack.back(); 1234 if (tmp.ResolveValue(exe_ctx, ast_context).IsZero()) 1235 { 1236 if (error_ptr) 1237 error_ptr->SetErrorString("Divide by zero."); 1238 return false; 1239 } 1240 else 1241 { 1242 stack.pop_back(); 1243 stack.back() = stack.back().ResolveValue(exe_ctx, ast_context) / tmp.ResolveValue(exe_ctx, ast_context); 1244 if (!stack.back().ResolveValue(exe_ctx, ast_context).IsValid()) 1245 { 1246 if (error_ptr) 1247 error_ptr->SetErrorString("Divide failed."); 1248 return false; 1249 } 1250 } 1251 } 1252 break; 1253 1254 //---------------------------------------------------------------------- 1255 // OPCODE: DW_OP_minus 1256 // OPERANDS: none 1257 // DESCRIPTION: pops the top two stack values, subtracts the former top 1258 // of the stack from the former second entry, and pushes the result. 1259 //---------------------------------------------------------------------- 1260 case DW_OP_minus: 1261 if (stack.size() < 2) 1262 { 1263 if (error_ptr) 1264 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_minus."); 1265 return false; 1266 } 1267 else 1268 { 1269 tmp = stack.back(); 1270 stack.pop_back(); 1271 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) - tmp.ResolveValue(exe_ctx, ast_context); 1272 } 1273 break; 1274 1275 //---------------------------------------------------------------------- 1276 // OPCODE: DW_OP_mod 1277 // OPERANDS: none 1278 // DESCRIPTION: pops the top two stack values and pushes the result of 1279 // the calculation: former second stack entry modulo the former top of 1280 // the stack. 1281 //---------------------------------------------------------------------- 1282 case DW_OP_mod: 1283 if (stack.size() < 2) 1284 { 1285 if (error_ptr) 1286 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_mod."); 1287 return false; 1288 } 1289 else 1290 { 1291 tmp = stack.back(); 1292 stack.pop_back(); 1293 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) % tmp.ResolveValue(exe_ctx, ast_context); 1294 } 1295 break; 1296 1297 1298 //---------------------------------------------------------------------- 1299 // OPCODE: DW_OP_mul 1300 // OPERANDS: none 1301 // DESCRIPTION: pops the top two stack entries, multiplies them 1302 // together, and pushes the result. 1303 //---------------------------------------------------------------------- 1304 case DW_OP_mul: 1305 if (stack.size() < 2) 1306 { 1307 if (error_ptr) 1308 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_mul."); 1309 return false; 1310 } 1311 else 1312 { 1313 tmp = stack.back(); 1314 stack.pop_back(); 1315 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) * tmp.ResolveValue(exe_ctx, ast_context); 1316 } 1317 break; 1318 1319 //---------------------------------------------------------------------- 1320 // OPCODE: DW_OP_neg 1321 // OPERANDS: none 1322 // DESCRIPTION: pops the top stack entry, and pushes its negation. 1323 //---------------------------------------------------------------------- 1324 case DW_OP_neg: 1325 if (stack.empty()) 1326 { 1327 if (error_ptr) 1328 error_ptr->SetErrorString("Expression stack needs at least 1 item for DW_OP_neg."); 1329 return false; 1330 } 1331 else 1332 { 1333 if (stack.back().ResolveValue(exe_ctx, ast_context).UnaryNegate() == false) 1334 { 1335 if (error_ptr) 1336 error_ptr->SetErrorString("Unary negate failed."); 1337 return false; 1338 } 1339 } 1340 break; 1341 1342 //---------------------------------------------------------------------- 1343 // OPCODE: DW_OP_not 1344 // OPERANDS: none 1345 // DESCRIPTION: pops the top stack entry, and pushes its bitwise 1346 // complement 1347 //---------------------------------------------------------------------- 1348 case DW_OP_not: 1349 if (stack.empty()) 1350 { 1351 if (error_ptr) 1352 error_ptr->SetErrorString("Expression stack needs at least 1 item for DW_OP_not."); 1353 return false; 1354 } 1355 else 1356 { 1357 if (stack.back().ResolveValue(exe_ctx, ast_context).OnesComplement() == false) 1358 { 1359 if (error_ptr) 1360 error_ptr->SetErrorString("Logical NOT failed."); 1361 return false; 1362 } 1363 } 1364 break; 1365 1366 //---------------------------------------------------------------------- 1367 // OPCODE: DW_OP_or 1368 // OPERANDS: none 1369 // DESCRIPTION: pops the top two stack entries, performs a bitwise or 1370 // operation on the two, and pushes the result. 1371 //---------------------------------------------------------------------- 1372 case DW_OP_or: 1373 if (stack.size() < 2) 1374 { 1375 if (error_ptr) 1376 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_or."); 1377 return false; 1378 } 1379 else 1380 { 1381 tmp = stack.back(); 1382 stack.pop_back(); 1383 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) | tmp.ResolveValue(exe_ctx, ast_context); 1384 } 1385 break; 1386 1387 //---------------------------------------------------------------------- 1388 // OPCODE: DW_OP_plus 1389 // OPERANDS: none 1390 // DESCRIPTION: pops the top two stack entries, adds them together, and 1391 // pushes the result. 1392 //---------------------------------------------------------------------- 1393 case DW_OP_plus: 1394 if (stack.size() < 2) 1395 { 1396 if (error_ptr) 1397 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_plus."); 1398 return false; 1399 } 1400 else 1401 { 1402 tmp = stack.back(); 1403 stack.pop_back(); 1404 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) + tmp.ResolveValue(exe_ctx, ast_context); 1405 } 1406 break; 1407 1408 //---------------------------------------------------------------------- 1409 // OPCODE: DW_OP_plus_uconst 1410 // OPERANDS: none 1411 // DESCRIPTION: pops the top stack entry, adds it to the unsigned LEB128 1412 // constant operand and pushes the result. 1413 //---------------------------------------------------------------------- 1414 case DW_OP_plus_uconst: 1415 if (stack.empty()) 1416 { 1417 if (error_ptr) 1418 error_ptr->SetErrorString("Expression stack needs at least 1 item for DW_OP_plus_uconst."); 1419 return false; 1420 } 1421 else 1422 { 1423 uint32_t uconst_value = opcodes.GetULEB128(&offset); 1424 // Implicit conversion from a UINT to a Scalar... 1425 stack.back().ResolveValue(exe_ctx, ast_context) += uconst_value; 1426 if (!stack.back().ResolveValue(exe_ctx, ast_context).IsValid()) 1427 { 1428 if (error_ptr) 1429 error_ptr->SetErrorString("DW_OP_plus_uconst failed."); 1430 return false; 1431 } 1432 } 1433 break; 1434 1435 //---------------------------------------------------------------------- 1436 // OPCODE: DW_OP_shl 1437 // OPERANDS: none 1438 // DESCRIPTION: pops the top two stack entries, shifts the former 1439 // second entry left by the number of bits specified by the former top 1440 // of the stack, and pushes the result. 1441 //---------------------------------------------------------------------- 1442 case DW_OP_shl: 1443 if (stack.size() < 2) 1444 { 1445 if (error_ptr) 1446 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_shl."); 1447 return false; 1448 } 1449 else 1450 { 1451 tmp = stack.back(); 1452 stack.pop_back(); 1453 stack.back().ResolveValue(exe_ctx, ast_context) <<= tmp.ResolveValue(exe_ctx, ast_context); 1454 } 1455 break; 1456 1457 //---------------------------------------------------------------------- 1458 // OPCODE: DW_OP_shr 1459 // OPERANDS: none 1460 // DESCRIPTION: pops the top two stack entries, shifts the former second 1461 // entry right logically (filling with zero bits) by the number of bits 1462 // specified by the former top of the stack, and pushes the result. 1463 //---------------------------------------------------------------------- 1464 case DW_OP_shr: 1465 if (stack.size() < 2) 1466 { 1467 if (error_ptr) 1468 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_shr."); 1469 return false; 1470 } 1471 else 1472 { 1473 tmp = stack.back(); 1474 stack.pop_back(); 1475 if (stack.back().ResolveValue(exe_ctx, ast_context).ShiftRightLogical(tmp.ResolveValue(exe_ctx, ast_context)) == false) 1476 { 1477 if (error_ptr) 1478 error_ptr->SetErrorString("DW_OP_shr failed."); 1479 return false; 1480 } 1481 } 1482 break; 1483 1484 //---------------------------------------------------------------------- 1485 // OPCODE: DW_OP_shra 1486 // OPERANDS: none 1487 // DESCRIPTION: pops the top two stack entries, shifts the former second 1488 // entry right arithmetically (divide the magnitude by 2, keep the same 1489 // sign for the result) by the number of bits specified by the former 1490 // top of the stack, and pushes the result. 1491 //---------------------------------------------------------------------- 1492 case DW_OP_shra: 1493 if (stack.size() < 2) 1494 { 1495 if (error_ptr) 1496 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_shra."); 1497 return false; 1498 } 1499 else 1500 { 1501 tmp = stack.back(); 1502 stack.pop_back(); 1503 stack.back().ResolveValue(exe_ctx, ast_context) >>= tmp.ResolveValue(exe_ctx, ast_context); 1504 } 1505 break; 1506 1507 //---------------------------------------------------------------------- 1508 // OPCODE: DW_OP_xor 1509 // OPERANDS: none 1510 // DESCRIPTION: pops the top two stack entries, performs the bitwise 1511 // exclusive-or operation on the two, and pushes the result. 1512 //---------------------------------------------------------------------- 1513 case DW_OP_xor: 1514 if (stack.size() < 2) 1515 { 1516 if (error_ptr) 1517 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_xor."); 1518 return false; 1519 } 1520 else 1521 { 1522 tmp = stack.back(); 1523 stack.pop_back(); 1524 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) ^ tmp.ResolveValue(exe_ctx, ast_context); 1525 } 1526 break; 1527 1528 1529 //---------------------------------------------------------------------- 1530 // OPCODE: DW_OP_skip 1531 // OPERANDS: int16_t 1532 // DESCRIPTION: An unconditional branch. Its single operand is a 2-byte 1533 // signed integer constant. The 2-byte constant is the number of bytes 1534 // of the DWARF expression to skip forward or backward from the current 1535 // operation, beginning after the 2-byte constant. 1536 //---------------------------------------------------------------------- 1537 case DW_OP_skip: 1538 { 1539 int16_t skip_offset = (int16_t)opcodes.GetU16(&offset); 1540 uint32_t new_offset = offset + skip_offset; 1541 if (new_offset >= opcodes_offset && new_offset < end_offset) 1542 offset = new_offset; 1543 else 1544 { 1545 if (error_ptr) 1546 error_ptr->SetErrorString("Invalid opcode offset in DW_OP_skip."); 1547 return false; 1548 } 1549 } 1550 break; 1551 1552 //---------------------------------------------------------------------- 1553 // OPCODE: DW_OP_bra 1554 // OPERANDS: int16_t 1555 // DESCRIPTION: A conditional branch. Its single operand is a 2-byte 1556 // signed integer constant. This operation pops the top of stack. If 1557 // the value popped is not the constant 0, the 2-byte constant operand 1558 // is the number of bytes of the DWARF expression to skip forward or 1559 // backward from the current operation, beginning after the 2-byte 1560 // constant. 1561 //---------------------------------------------------------------------- 1562 case DW_OP_bra: 1563 { 1564 tmp = stack.back(); 1565 stack.pop_back(); 1566 int16_t bra_offset = (int16_t)opcodes.GetU16(&offset); 1567 Scalar zero(0); 1568 if (tmp.ResolveValue(exe_ctx, ast_context) != zero) 1569 { 1570 uint32_t new_offset = offset + bra_offset; 1571 if (new_offset >= opcodes_offset && new_offset < end_offset) 1572 offset = new_offset; 1573 else 1574 { 1575 if (error_ptr) 1576 error_ptr->SetErrorString("Invalid opcode offset in DW_OP_bra."); 1577 return false; 1578 } 1579 } 1580 } 1581 break; 1582 1583 //---------------------------------------------------------------------- 1584 // OPCODE: DW_OP_eq 1585 // OPERANDS: none 1586 // DESCRIPTION: pops the top two stack values, compares using the 1587 // equals (==) operator. 1588 // STACK RESULT: push the constant value 1 onto the stack if the result 1589 // of the operation is true or the constant value 0 if the result of the 1590 // operation is false. 1591 //---------------------------------------------------------------------- 1592 case DW_OP_eq: 1593 if (stack.size() < 2) 1594 { 1595 if (error_ptr) 1596 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_eq."); 1597 return false; 1598 } 1599 else 1600 { 1601 tmp = stack.back(); 1602 stack.pop_back(); 1603 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) == tmp.ResolveValue(exe_ctx, ast_context); 1604 } 1605 break; 1606 1607 //---------------------------------------------------------------------- 1608 // OPCODE: DW_OP_ge 1609 // OPERANDS: none 1610 // DESCRIPTION: pops the top two stack values, compares using the 1611 // greater than or equal to (>=) operator. 1612 // STACK RESULT: push the constant value 1 onto the stack if the result 1613 // of the operation is true or the constant value 0 if the result of the 1614 // operation is false. 1615 //---------------------------------------------------------------------- 1616 case DW_OP_ge: 1617 if (stack.size() < 2) 1618 { 1619 if (error_ptr) 1620 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_ge."); 1621 return false; 1622 } 1623 else 1624 { 1625 tmp = stack.back(); 1626 stack.pop_back(); 1627 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) >= tmp.ResolveValue(exe_ctx, ast_context); 1628 } 1629 break; 1630 1631 //---------------------------------------------------------------------- 1632 // OPCODE: DW_OP_gt 1633 // OPERANDS: none 1634 // DESCRIPTION: pops the top two stack values, compares using the 1635 // greater than (>) operator. 1636 // STACK RESULT: push the constant value 1 onto the stack if the result 1637 // of the operation is true or the constant value 0 if the result of the 1638 // operation is false. 1639 //---------------------------------------------------------------------- 1640 case DW_OP_gt: 1641 if (stack.size() < 2) 1642 { 1643 if (error_ptr) 1644 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_gt."); 1645 return false; 1646 } 1647 else 1648 { 1649 tmp = stack.back(); 1650 stack.pop_back(); 1651 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) > tmp.ResolveValue(exe_ctx, ast_context); 1652 } 1653 break; 1654 1655 //---------------------------------------------------------------------- 1656 // OPCODE: DW_OP_le 1657 // OPERANDS: none 1658 // DESCRIPTION: pops the top two stack values, compares using the 1659 // less than or equal to (<=) operator. 1660 // STACK RESULT: push the constant value 1 onto the stack if the result 1661 // of the operation is true or the constant value 0 if the result of the 1662 // operation is false. 1663 //---------------------------------------------------------------------- 1664 case DW_OP_le: 1665 if (stack.size() < 2) 1666 { 1667 if (error_ptr) 1668 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_le."); 1669 return false; 1670 } 1671 else 1672 { 1673 tmp = stack.back(); 1674 stack.pop_back(); 1675 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) <= tmp.ResolveValue(exe_ctx, ast_context); 1676 } 1677 break; 1678 1679 //---------------------------------------------------------------------- 1680 // OPCODE: DW_OP_lt 1681 // OPERANDS: none 1682 // DESCRIPTION: pops the top two stack values, compares using the 1683 // less than (<) operator. 1684 // STACK RESULT: push the constant value 1 onto the stack if the result 1685 // of the operation is true or the constant value 0 if the result of the 1686 // operation is false. 1687 //---------------------------------------------------------------------- 1688 case DW_OP_lt: 1689 if (stack.size() < 2) 1690 { 1691 if (error_ptr) 1692 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_lt."); 1693 return false; 1694 } 1695 else 1696 { 1697 tmp = stack.back(); 1698 stack.pop_back(); 1699 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) < tmp.ResolveValue(exe_ctx, ast_context); 1700 } 1701 break; 1702 1703 //---------------------------------------------------------------------- 1704 // OPCODE: DW_OP_ne 1705 // OPERANDS: none 1706 // DESCRIPTION: pops the top two stack values, compares using the 1707 // not equal (!=) operator. 1708 // STACK RESULT: push the constant value 1 onto the stack if the result 1709 // of the operation is true or the constant value 0 if the result of the 1710 // operation is false. 1711 //---------------------------------------------------------------------- 1712 case DW_OP_ne: 1713 if (stack.size() < 2) 1714 { 1715 if (error_ptr) 1716 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_ne."); 1717 return false; 1718 } 1719 else 1720 { 1721 tmp = stack.back(); 1722 stack.pop_back(); 1723 stack.back().ResolveValue(exe_ctx, ast_context) = stack.back().ResolveValue(exe_ctx, ast_context) != tmp.ResolveValue(exe_ctx, ast_context); 1724 } 1725 break; 1726 1727 //---------------------------------------------------------------------- 1728 // OPCODE: DW_OP_litn 1729 // OPERANDS: none 1730 // DESCRIPTION: encode the unsigned literal values from 0 through 31. 1731 // STACK RESULT: push the unsigned literal constant value onto the top 1732 // of the stack. 1733 //---------------------------------------------------------------------- 1734 case DW_OP_lit0: 1735 case DW_OP_lit1: 1736 case DW_OP_lit2: 1737 case DW_OP_lit3: 1738 case DW_OP_lit4: 1739 case DW_OP_lit5: 1740 case DW_OP_lit6: 1741 case DW_OP_lit7: 1742 case DW_OP_lit8: 1743 case DW_OP_lit9: 1744 case DW_OP_lit10: 1745 case DW_OP_lit11: 1746 case DW_OP_lit12: 1747 case DW_OP_lit13: 1748 case DW_OP_lit14: 1749 case DW_OP_lit15: 1750 case DW_OP_lit16: 1751 case DW_OP_lit17: 1752 case DW_OP_lit18: 1753 case DW_OP_lit19: 1754 case DW_OP_lit20: 1755 case DW_OP_lit21: 1756 case DW_OP_lit22: 1757 case DW_OP_lit23: 1758 case DW_OP_lit24: 1759 case DW_OP_lit25: 1760 case DW_OP_lit26: 1761 case DW_OP_lit27: 1762 case DW_OP_lit28: 1763 case DW_OP_lit29: 1764 case DW_OP_lit30: 1765 case DW_OP_lit31: 1766 stack.push_back(op - DW_OP_lit0); 1767 break; 1768 1769 //---------------------------------------------------------------------- 1770 // OPCODE: DW_OP_regN 1771 // OPERANDS: none 1772 // DESCRIPTION: Push the value in register n on the top of the stack. 1773 //---------------------------------------------------------------------- 1774 case DW_OP_reg0: 1775 case DW_OP_reg1: 1776 case DW_OP_reg2: 1777 case DW_OP_reg3: 1778 case DW_OP_reg4: 1779 case DW_OP_reg5: 1780 case DW_OP_reg6: 1781 case DW_OP_reg7: 1782 case DW_OP_reg8: 1783 case DW_OP_reg9: 1784 case DW_OP_reg10: 1785 case DW_OP_reg11: 1786 case DW_OP_reg12: 1787 case DW_OP_reg13: 1788 case DW_OP_reg14: 1789 case DW_OP_reg15: 1790 case DW_OP_reg16: 1791 case DW_OP_reg17: 1792 case DW_OP_reg18: 1793 case DW_OP_reg19: 1794 case DW_OP_reg20: 1795 case DW_OP_reg21: 1796 case DW_OP_reg22: 1797 case DW_OP_reg23: 1798 case DW_OP_reg24: 1799 case DW_OP_reg25: 1800 case DW_OP_reg26: 1801 case DW_OP_reg27: 1802 case DW_OP_reg28: 1803 case DW_OP_reg29: 1804 case DW_OP_reg30: 1805 case DW_OP_reg31: 1806 { 1807 reg_num = op - DW_OP_reg0; 1808 1809 if (ReadRegisterValueAsScalar (exe_ctx, reg_kind, reg_num, error_ptr, tmp)) 1810 stack.push_back(tmp); 1811 else 1812 return false; 1813 } 1814 break; 1815 //---------------------------------------------------------------------- 1816 // OPCODE: DW_OP_regx 1817 // OPERANDS: 1818 // ULEB128 literal operand that encodes the register. 1819 // DESCRIPTION: Push the value in register on the top of the stack. 1820 //---------------------------------------------------------------------- 1821 case DW_OP_regx: 1822 { 1823 reg_num = opcodes.GetULEB128(&offset); 1824 if (ReadRegisterValueAsScalar (exe_ctx, reg_kind, reg_num, error_ptr, tmp)) 1825 stack.push_back(tmp); 1826 else 1827 return false; 1828 } 1829 break; 1830 1831 //---------------------------------------------------------------------- 1832 // OPCODE: DW_OP_bregN 1833 // OPERANDS: 1834 // SLEB128 offset from register N 1835 // DESCRIPTION: Value is in memory at the address specified by register 1836 // N plus an offset. 1837 //---------------------------------------------------------------------- 1838 case DW_OP_breg0: 1839 case DW_OP_breg1: 1840 case DW_OP_breg2: 1841 case DW_OP_breg3: 1842 case DW_OP_breg4: 1843 case DW_OP_breg5: 1844 case DW_OP_breg6: 1845 case DW_OP_breg7: 1846 case DW_OP_breg8: 1847 case DW_OP_breg9: 1848 case DW_OP_breg10: 1849 case DW_OP_breg11: 1850 case DW_OP_breg12: 1851 case DW_OP_breg13: 1852 case DW_OP_breg14: 1853 case DW_OP_breg15: 1854 case DW_OP_breg16: 1855 case DW_OP_breg17: 1856 case DW_OP_breg18: 1857 case DW_OP_breg19: 1858 case DW_OP_breg20: 1859 case DW_OP_breg21: 1860 case DW_OP_breg22: 1861 case DW_OP_breg23: 1862 case DW_OP_breg24: 1863 case DW_OP_breg25: 1864 case DW_OP_breg26: 1865 case DW_OP_breg27: 1866 case DW_OP_breg28: 1867 case DW_OP_breg29: 1868 case DW_OP_breg30: 1869 case DW_OP_breg31: 1870 { 1871 reg_num = op - DW_OP_breg0; 1872 1873 if (ReadRegisterValueAsScalar (exe_ctx, reg_kind, reg_num, error_ptr, tmp)) 1874 { 1875 int64_t breg_offset = opcodes.GetSLEB128(&offset); 1876 tmp.ResolveValue(exe_ctx, ast_context) += (uint64_t)breg_offset; 1877 stack.push_back(tmp); 1878 stack.back().SetValueType (Value::eValueTypeLoadAddress); 1879 } 1880 else 1881 return false; 1882 } 1883 break; 1884 //---------------------------------------------------------------------- 1885 // OPCODE: DW_OP_bregx 1886 // OPERANDS: 2 1887 // ULEB128 literal operand that encodes the register. 1888 // SLEB128 offset from register N 1889 // DESCRIPTION: Value is in memory at the address specified by register 1890 // N plus an offset. 1891 //---------------------------------------------------------------------- 1892 case DW_OP_bregx: 1893 { 1894 reg_num = opcodes.GetULEB128(&offset); 1895 1896 if (ReadRegisterValueAsScalar (exe_ctx, reg_kind, reg_num, error_ptr, tmp)) 1897 { 1898 int64_t breg_offset = opcodes.GetSLEB128(&offset); 1899 tmp.ResolveValue(exe_ctx, ast_context) += (uint64_t)breg_offset; 1900 stack.push_back(tmp); 1901 stack.back().SetValueType (Value::eValueTypeLoadAddress); 1902 } 1903 else 1904 return false; 1905 } 1906 break; 1907 1908 case DW_OP_fbreg: 1909 if (exe_ctx && exe_ctx->frame) 1910 { 1911 Scalar value; 1912 if (exe_ctx->frame->GetFrameBaseValue(value, error_ptr)) 1913 { 1914 int64_t fbreg_offset = opcodes.GetSLEB128(&offset); 1915 value += fbreg_offset; 1916 stack.push_back(value); 1917 stack.back().SetValueType (Value::eValueTypeLoadAddress); 1918 } 1919 else 1920 return false; 1921 } 1922 else 1923 { 1924 if (error_ptr) 1925 error_ptr->SetErrorString ("Invalid stack frame in context for DW_OP_fbreg opcode."); 1926 return false; 1927 } 1928 break; 1929 1930 //---------------------------------------------------------------------- 1931 // OPCODE: DW_OP_nop 1932 // OPERANDS: none 1933 // DESCRIPTION: A place holder. It has no effect on the location stack 1934 // or any of its values. 1935 //---------------------------------------------------------------------- 1936 case DW_OP_nop: 1937 break; 1938 1939 //---------------------------------------------------------------------- 1940 // OPCODE: DW_OP_piece 1941 // OPERANDS: 1 1942 // ULEB128: byte size of the piece 1943 // DESCRIPTION: The operand describes the size in bytes of the piece of 1944 // the object referenced by the DWARF expression whose result is at the 1945 // top of the stack. If the piece is located in a register, but does not 1946 // occupy the entire register, the placement of the piece within that 1947 // register is defined by the ABI. 1948 // 1949 // Many compilers store a single variable in sets of registers, or store 1950 // a variable partially in memory and partially in registers. 1951 // DW_OP_piece provides a way of describing how large a part of a 1952 // variable a particular DWARF expression refers to. 1953 //---------------------------------------------------------------------- 1954 case DW_OP_piece: 1955 if (error_ptr) 1956 error_ptr->SetErrorString ("Unimplemented opcode DW_OP_piece."); 1957 return false; 1958 1959 //---------------------------------------------------------------------- 1960 // OPCODE: DW_OP_push_object_address 1961 // OPERANDS: none 1962 // DESCRIPTION: Pushes the address of the object currently being 1963 // evaluated as part of evaluation of a user presented expression. 1964 // This object may correspond to an independent variable described by 1965 // its own DIE or it may be a component of an array, structure, or class 1966 // whose address has been dynamically determined by an earlier step 1967 // during user expression evaluation. 1968 //---------------------------------------------------------------------- 1969 case DW_OP_push_object_address: 1970 if (error_ptr) 1971 error_ptr->SetErrorString ("Unimplemented opcode DW_OP_push_object_address."); 1972 return false; 1973 1974 //---------------------------------------------------------------------- 1975 // OPCODE: DW_OP_call2 1976 // OPERANDS: 1977 // uint16_t compile unit relative offset of a DIE 1978 // DESCRIPTION: Performs subroutine calls during evaluation 1979 // of a DWARF expression. The operand is the 2-byte unsigned offset 1980 // of a debugging information entry in the current compilation unit. 1981 // 1982 // Operand interpretation is exactly like that for DW_FORM_ref2. 1983 // 1984 // This operation transfers control of DWARF expression evaluation 1985 // to the DW_AT_location attribute of the referenced DIE. If there is 1986 // no such attribute, then there is no effect. Execution of the DWARF 1987 // expression of a DW_AT_location attribute may add to and/or remove from 1988 // values on the stack. Execution returns to the point following the call 1989 // when the end of the attribute is reached. Values on the stack at the 1990 // time of the call may be used as parameters by the called expression 1991 // and values left on the stack by the called expression may be used as 1992 // return values by prior agreement between the calling and called 1993 // expressions. 1994 //---------------------------------------------------------------------- 1995 case DW_OP_call2: 1996 if (error_ptr) 1997 error_ptr->SetErrorString ("Unimplemented opcode DW_OP_call2."); 1998 return false; 1999 //---------------------------------------------------------------------- 2000 // OPCODE: DW_OP_call4 2001 // OPERANDS: 1 2002 // uint32_t compile unit relative offset of a DIE 2003 // DESCRIPTION: Performs a subroutine call during evaluation of a DWARF 2004 // expression. For DW_OP_call4, the operand is a 4-byte unsigned offset 2005 // of a debugging information entry in the current compilation unit. 2006 // 2007 // Operand interpretation DW_OP_call4 is exactly like that for 2008 // DW_FORM_ref4. 2009 // 2010 // This operation transfers control of DWARF expression evaluation 2011 // to the DW_AT_location attribute of the referenced DIE. If there is 2012 // no such attribute, then there is no effect. Execution of the DWARF 2013 // expression of a DW_AT_location attribute may add to and/or remove from 2014 // values on the stack. Execution returns to the point following the call 2015 // when the end of the attribute is reached. Values on the stack at the 2016 // time of the call may be used as parameters by the called expression 2017 // and values left on the stack by the called expression may be used as 2018 // return values by prior agreement between the calling and called 2019 // expressions. 2020 //---------------------------------------------------------------------- 2021 case DW_OP_call4: 2022 if (error_ptr) 2023 error_ptr->SetErrorString ("Unimplemented opcode DW_OP_call4."); 2024 return false; 2025 2026 2027 //---------------------------------------------------------------------- 2028 // OPCODE: DW_OP_call_ref 2029 // OPERANDS: 2030 // uint32_t absolute DIE offset for 32-bit DWARF or a uint64_t 2031 // absolute DIE offset for 64 bit DWARF. 2032 // DESCRIPTION: Performs a subroutine call during evaluation of a DWARF 2033 // expression. Takes a single operand. In the 32-bit DWARF format, the 2034 // operand is a 4-byte unsigned value; in the 64-bit DWARF format, it 2035 // is an 8-byte unsigned value. The operand is used as the offset of a 2036 // debugging information entry in a .debug_info section which may be 2037 // contained in a shared object for executable other than that 2038 // containing the operator. For references from one shared object or 2039 // executable to another, the relocation must be performed by the 2040 // consumer. 2041 // 2042 // Operand interpretation of DW_OP_call_ref is exactly like that for 2043 // DW_FORM_ref_addr. 2044 // 2045 // This operation transfers control of DWARF expression evaluation 2046 // to the DW_AT_location attribute of the referenced DIE. If there is 2047 // no such attribute, then there is no effect. Execution of the DWARF 2048 // expression of a DW_AT_location attribute may add to and/or remove from 2049 // values on the stack. Execution returns to the point following the call 2050 // when the end of the attribute is reached. Values on the stack at the 2051 // time of the call may be used as parameters by the called expression 2052 // and values left on the stack by the called expression may be used as 2053 // return values by prior agreement between the calling and called 2054 // expressions. 2055 //---------------------------------------------------------------------- 2056 case DW_OP_call_ref: 2057 if (error_ptr) 2058 error_ptr->SetErrorString ("Unimplemented opcode DW_OP_call_ref."); 2059 return false; 2060 2061 //---------------------------------------------------------------------- 2062 // OPCODE: DW_OP_APPLE_array_ref 2063 // OPERANDS: none 2064 // DESCRIPTION: Pops a value off the stack and uses it as the array 2065 // index. Pops a second value off the stack and uses it as the array 2066 // itself. Pushes a value onto the stack representing the element of 2067 // the array specified by the index. 2068 //---------------------------------------------------------------------- 2069 case DW_OP_APPLE_array_ref: 2070 { 2071 if (stack.size() < 2) 2072 { 2073 if (error_ptr) 2074 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_APPLE_array_ref."); 2075 return false; 2076 } 2077 2078 Value index_val = stack.back(); 2079 stack.pop_back(); 2080 Value array_val = stack.back(); 2081 stack.pop_back(); 2082 2083 Scalar &index_scalar = index_val.ResolveValue(exe_ctx, ast_context); 2084 int64_t index = index_scalar.SLongLong(LONG_LONG_MAX); 2085 2086 if (index == LONG_LONG_MAX) 2087 { 2088 if (error_ptr) 2089 error_ptr->SetErrorString("Invalid array index."); 2090 return false; 2091 } 2092 2093 if (array_val.GetContextType() != Value::eContextTypeOpaqueClangQualType) 2094 { 2095 if (error_ptr) 2096 error_ptr->SetErrorString("Arrays without Clang types are unhandled at this time."); 2097 return false; 2098 } 2099 2100 if (array_val.GetValueType() != Value::eValueTypeLoadAddress && 2101 array_val.GetValueType() != Value::eValueTypeHostAddress) 2102 { 2103 if (error_ptr) 2104 error_ptr->SetErrorString("Array must be stored in memory."); 2105 return false; 2106 } 2107 2108 void *array_type = array_val.GetOpaqueClangQualType(); 2109 2110 void *member_type; 2111 uint64_t size = 0; 2112 2113 if ((!ClangASTContext::IsPointerType(array_type, &member_type)) && 2114 (!ClangASTContext::IsArrayType(array_type, &member_type, &size))) 2115 { 2116 if (error_ptr) 2117 error_ptr->SetErrorString("Array reference from something that is neither a pointer nor an array."); 2118 return false; 2119 } 2120 2121 if (size && (index >= size || index < 0)) 2122 { 2123 if (error_ptr) 2124 error_ptr->SetErrorStringWithFormat("Out of bounds array access. %lld is not in [0, %llu]", index, size); 2125 return false; 2126 } 2127 2128 uint64_t member_bit_size = ClangASTContext::GetTypeBitSize(ast_context, member_type); 2129 uint64_t member_bit_align = ClangASTContext::GetTypeBitAlign(ast_context, member_type); 2130 uint64_t member_bit_incr = ((member_bit_size + member_bit_align - 1) / member_bit_align) * member_bit_align; 2131 if (member_bit_incr % 8) 2132 { 2133 if (error_ptr) 2134 error_ptr->SetErrorStringWithFormat("Array increment is not byte aligned", index, size); 2135 return false; 2136 } 2137 int64_t member_offset = (int64_t)(member_bit_incr / 8) * index; 2138 2139 Value member; 2140 2141 member.SetContext(Value::eContextTypeOpaqueClangQualType, member_type); 2142 member.SetValueType(array_val.GetValueType()); 2143 2144 addr_t array_base = (addr_t)array_val.GetScalar().ULongLong(LLDB_INVALID_ADDRESS); 2145 addr_t member_loc = array_base + member_offset; 2146 member.GetScalar() = (uint64_t)member_loc; 2147 2148 stack.push_back(member); 2149 } 2150 break; 2151 2152 //---------------------------------------------------------------------- 2153 // OPCODE: DW_OP_APPLE_uninit 2154 // OPERANDS: none 2155 // DESCRIPTION: Lets us know that the value is currently not initialized 2156 //---------------------------------------------------------------------- 2157 case DW_OP_APPLE_uninit: 2158 //return eResultTypeErrorUninitialized; 2159 break; // Ignore this as we have seen cases where this value is incorrectly added 2160 2161 //---------------------------------------------------------------------- 2162 // OPCODE: DW_OP_APPLE_assign 2163 // OPERANDS: none 2164 // DESCRIPTION: Pops a value off of the stack and assigns it to the next 2165 // item on the stack which must be something assignable (inferior 2166 // Variable, inferior Type with address, inferior register, or 2167 // expression local variable. 2168 //---------------------------------------------------------------------- 2169 case DW_OP_APPLE_assign: 2170 if (stack.size() < 2) 2171 { 2172 if (error_ptr) 2173 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_APPLE_assign."); 2174 return false; 2175 } 2176 else 2177 { 2178 tmp = stack.back(); 2179 stack.pop_back(); 2180 Value::ContextType context_type = stack.back().GetContextType(); 2181 StreamString new_value(Stream::eBinary, 4, eByteOrderHost); 2182 switch (context_type) 2183 { 2184 case Value::eContextTypeOpaqueClangQualType: 2185 { 2186 void *clang_type = stack.back().GetOpaqueClangQualType(); 2187 2188 if (ClangASTContext::IsAggregateType (clang_type)) 2189 { 2190 Value::ValueType source_value_type = tmp.GetValueType(); 2191 Value::ValueType target_value_type = stack.back().GetValueType(); 2192 2193 addr_t source_addr = (addr_t)tmp.GetScalar().ULongLong(); 2194 addr_t target_addr = (addr_t)stack.back().GetScalar().ULongLong(); 2195 2196 size_t byte_size = (ClangASTContext::GetTypeBitSize(ast_context, clang_type) + 7) / 8; 2197 2198 switch (source_value_type) 2199 { 2200 case Value::eValueTypeLoadAddress: 2201 switch (target_value_type) 2202 { 2203 case Value::eValueTypeLoadAddress: 2204 { 2205 DataBufferHeap data; 2206 data.SetByteSize(byte_size); 2207 2208 Error error; 2209 if (exe_ctx->process->ReadMemory (source_addr, data.GetBytes(), byte_size, error) != byte_size) 2210 { 2211 if (error_ptr) 2212 error_ptr->SetErrorStringWithFormat ("Couldn't read a composite type from the target: %s", error.AsCString()); 2213 return false; 2214 } 2215 2216 if (exe_ctx->process->WriteMemory (target_addr, data.GetBytes(), byte_size, error) != byte_size) 2217 { 2218 if (error_ptr) 2219 error_ptr->SetErrorStringWithFormat ("Couldn't write a composite type to the target: %s", error.AsCString()); 2220 return false; 2221 } 2222 } 2223 break; 2224 case Value::eValueTypeHostAddress: 2225 if (exe_ctx->process->GetByteOrder() != Host::GetByteOrder()) 2226 { 2227 if (error_ptr) 2228 error_ptr->SetErrorStringWithFormat ("Copy of composite types between incompatible byte orders is unimplemented"); 2229 return false; 2230 } 2231 else 2232 { 2233 Error error; 2234 if (exe_ctx->process->ReadMemory (source_addr, (uint8_t*)target_addr, byte_size, error) != byte_size) 2235 { 2236 if (error_ptr) 2237 error_ptr->SetErrorStringWithFormat ("Couldn't read a composite type from the target: %s", error.AsCString()); 2238 return false; 2239 } 2240 } 2241 break; 2242 default: 2243 return false; 2244 } 2245 break; 2246 case Value::eValueTypeHostAddress: 2247 switch (target_value_type) 2248 { 2249 case Value::eValueTypeLoadAddress: 2250 if (exe_ctx->process->GetByteOrder() != Host::GetByteOrder()) 2251 { 2252 if (error_ptr) 2253 error_ptr->SetErrorStringWithFormat ("Copy of composite types between incompatible byte orders is unimplemented"); 2254 return false; 2255 } 2256 else 2257 { 2258 Error error; 2259 if (exe_ctx->process->WriteMemory (target_addr, (uint8_t*)source_addr, byte_size, error) != byte_size) 2260 { 2261 if (error_ptr) 2262 error_ptr->SetErrorStringWithFormat ("Couldn't write a composite type to the target: %s", error.AsCString()); 2263 return false; 2264 } 2265 } 2266 case Value::eValueTypeHostAddress: 2267 memcpy ((uint8_t*)target_addr, (uint8_t*)source_addr, byte_size); 2268 break; 2269 default: 2270 return false; 2271 } 2272 } 2273 } 2274 else 2275 { 2276 if (!Type::SetValueFromScalar(ast_context, 2277 clang_type, 2278 tmp.ResolveValue(exe_ctx, ast_context), 2279 new_value)) 2280 { 2281 if (error_ptr) 2282 error_ptr->SetErrorStringWithFormat ("Couldn't extract a value from an integral type.\n"); 2283 return false; 2284 } 2285 2286 Value::ValueType value_type = stack.back().GetValueType(); 2287 2288 switch (value_type) 2289 { 2290 case Value::eValueTypeLoadAddress: 2291 case Value::eValueTypeHostAddress: 2292 { 2293 lldb::AddressType address_type = (value_type == Value::eValueTypeLoadAddress ? eAddressTypeLoad : eAddressTypeHost); 2294 lldb::addr_t addr = stack.back().GetScalar().ULongLong(LLDB_INVALID_ADDRESS); 2295 if (!Type::WriteToMemory (exe_ctx, 2296 ast_context, 2297 clang_type, 2298 addr, 2299 address_type, 2300 new_value)) 2301 { 2302 if (error_ptr) 2303 error_ptr->SetErrorStringWithFormat ("Failed to write value to memory at 0x%llx.\n", addr); 2304 return false; 2305 } 2306 } 2307 break; 2308 2309 default: 2310 break; 2311 } 2312 } 2313 } 2314 break; 2315 2316 default: 2317 if (error_ptr) 2318 error_ptr->SetErrorString ("Assign failed."); 2319 return false; 2320 } 2321 } 2322 break; 2323 2324 //---------------------------------------------------------------------- 2325 // OPCODE: DW_OP_APPLE_address_of 2326 // OPERANDS: none 2327 // DESCRIPTION: Pops a value off of the stack and pushed its address. 2328 // The top item on the stack must be a variable, or already be a memory 2329 // location. 2330 //---------------------------------------------------------------------- 2331 case DW_OP_APPLE_address_of: 2332 if (stack.empty()) 2333 { 2334 if (error_ptr) 2335 error_ptr->SetErrorString("Expression stack needs at least 1 item for DW_OP_APPLE_address_of."); 2336 return false; 2337 } 2338 else 2339 { 2340 Value::ValueType value_type = stack.back().GetValueType(); 2341 switch (value_type) 2342 { 2343 default: 2344 case Value::eValueTypeScalar: // raw scalar value 2345 if (error_ptr) 2346 error_ptr->SetErrorString("Top stack item isn't a memory based object."); 2347 return false; 2348 2349 case Value::eValueTypeLoadAddress: // load address value 2350 case Value::eValueTypeFileAddress: // file address value 2351 case Value::eValueTypeHostAddress: // host address value (for memory in the process that is using liblldb) 2352 // Taking the address of an object reduces it to the address 2353 // of the value and removes any extra context it had. 2354 //stack.back().SetValueType(Value::eValueTypeScalar); 2355 stack.back().ClearContext(); 2356 break; 2357 } 2358 } 2359 break; 2360 2361 //---------------------------------------------------------------------- 2362 // OPCODE: DW_OP_APPLE_value_of 2363 // OPERANDS: none 2364 // DESCRIPTION: Pops a value off of the stack and pushed its value. 2365 // The top item on the stack must be a variable, expression variable. 2366 //---------------------------------------------------------------------- 2367 case DW_OP_APPLE_value_of: 2368 if (stack.empty()) 2369 { 2370 if (error_ptr) 2371 error_ptr->SetErrorString("Expression stack needs at least 1 items for DW_OP_APPLE_value_of."); 2372 return false; 2373 } 2374 else if (!stack.back().ValueOf(exe_ctx, ast_context)) 2375 { 2376 if (error_ptr) 2377 error_ptr->SetErrorString ("Top stack item isn't a valid candidate for DW_OP_APPLE_value_of."); 2378 return false; 2379 } 2380 break; 2381 2382 //---------------------------------------------------------------------- 2383 // OPCODE: DW_OP_APPLE_deref_type 2384 // OPERANDS: none 2385 // DESCRIPTION: gets the value pointed to by the top stack item 2386 //---------------------------------------------------------------------- 2387 case DW_OP_APPLE_deref_type: 2388 { 2389 if (stack.empty()) 2390 { 2391 if (error_ptr) 2392 error_ptr->SetErrorString("Expression stack needs at least 1 items for DW_OP_APPLE_deref_type."); 2393 return false; 2394 } 2395 2396 tmp = stack.back(); 2397 stack.pop_back(); 2398 2399 if (tmp.GetContextType() != Value::eContextTypeOpaqueClangQualType) 2400 { 2401 if (error_ptr) 2402 error_ptr->SetErrorString("Item at top of expression stack must have a Clang type"); 2403 return false; 2404 } 2405 2406 void *ptr_type = tmp.GetOpaqueClangQualType(); 2407 void *target_type; 2408 2409 if (!ClangASTContext::IsPointerType(ptr_type, &target_type)) 2410 { 2411 if (error_ptr) 2412 error_ptr->SetErrorString("Dereferencing a non-pointer type"); 2413 return false; 2414 } 2415 2416 // TODO do we want all pointers to be dereferenced as load addresses? 2417 Value::ValueType value_type = tmp.GetValueType(); 2418 2419 tmp.ResolveValue(exe_ctx, ast_context); 2420 2421 tmp.SetValueType(value_type); 2422 tmp.SetContext(Value::eContextTypeOpaqueClangQualType, target_type); 2423 2424 stack.push_back(tmp); 2425 } 2426 break; 2427 2428 //---------------------------------------------------------------------- 2429 // OPCODE: DW_OP_APPLE_expr_local 2430 // OPERANDS: ULEB128 2431 // DESCRIPTION: pushes the expression local variable index onto the 2432 // stack and set the appropriate context so we know the stack item is 2433 // an expression local variable index. 2434 //---------------------------------------------------------------------- 2435 case DW_OP_APPLE_expr_local: 2436 { 2437 uint32_t idx = opcodes.GetULEB128(&offset); 2438 if (expr_locals == NULL) 2439 { 2440 if (error_ptr) 2441 error_ptr->SetErrorStringWithFormat ("DW_OP_APPLE_expr_local(%u) opcode encountered with no local variable list.\n", idx); 2442 return false; 2443 } 2444 Value *expr_local_variable = expr_locals->GetVariableAtIndex(idx); 2445 if (expr_local_variable == NULL) 2446 { 2447 if (error_ptr) 2448 error_ptr->SetErrorStringWithFormat ("DW_OP_APPLE_expr_local(%u) with invalid index %u.\n", idx, idx); 2449 return false; 2450 } 2451 Value *proxy = expr_local_variable->CreateProxy(); 2452 stack.push_back(*proxy); 2453 delete proxy; 2454 //stack.back().SetContext (Value::eContextTypeOpaqueClangQualType, expr_local_variable->GetOpaqueClangQualType()); 2455 } 2456 break; 2457 2458 //---------------------------------------------------------------------- 2459 // OPCODE: DW_OP_APPLE_extern 2460 // OPERANDS: ULEB128 2461 // DESCRIPTION: pushes a proxy for the extern object index onto the 2462 // stack. 2463 //---------------------------------------------------------------------- 2464 case DW_OP_APPLE_extern: 2465 { 2466 uint32_t idx = opcodes.GetULEB128(&offset); 2467 if (!decl_map) 2468 { 2469 if (error_ptr) 2470 error_ptr->SetErrorStringWithFormat ("DW_OP_APPLE_extern(%u) opcode encountered with no decl map.\n", idx); 2471 return false; 2472 } 2473 Value *extern_var = decl_map->GetValueForIndex(idx); 2474 if (!extern_var) 2475 { 2476 if (error_ptr) 2477 error_ptr->SetErrorStringWithFormat ("DW_OP_APPLE_extern(%u) with invalid index %u.\n", idx, idx); 2478 return false; 2479 } 2480 Value *proxy = extern_var->CreateProxy(); 2481 stack.push_back(*proxy); 2482 delete proxy; 2483 } 2484 break; 2485 2486 case DW_OP_APPLE_scalar_cast: 2487 if (stack.empty()) 2488 { 2489 if (error_ptr) 2490 error_ptr->SetErrorString("Expression stack needs at least 1 item for DW_OP_APPLE_scalar_cast."); 2491 return false; 2492 } 2493 else 2494 { 2495 // Simple scalar cast 2496 if (!stack.back().ResolveValue(exe_ctx, ast_context).Cast((Scalar::Type)opcodes.GetU8(&offset))) 2497 { 2498 if (error_ptr) 2499 error_ptr->SetErrorString("Cast failed."); 2500 return false; 2501 } 2502 } 2503 break; 2504 2505 2506 case DW_OP_APPLE_clang_cast: 2507 if (stack.empty()) 2508 { 2509 if (error_ptr) 2510 error_ptr->SetErrorString("Expression stack needs at least 1 item for DW_OP_APPLE_clang_cast."); 2511 return false; 2512 } 2513 else 2514 { 2515 void *clang_type = (void *)opcodes.GetMaxU64(&offset, sizeof(void*)); 2516 stack.back().SetContext (Value::eContextTypeOpaqueClangQualType, clang_type); 2517 } 2518 break; 2519 //---------------------------------------------------------------------- 2520 // OPCODE: DW_OP_APPLE_constf 2521 // OPERANDS: 1 byte float length, followed by that many bytes containing 2522 // the constant float data. 2523 // DESCRIPTION: Push a float value onto the expression stack. 2524 //---------------------------------------------------------------------- 2525 case DW_OP_APPLE_constf: // 0xF6 - 1 byte float size, followed by constant float data 2526 { 2527 uint8_t float_length = opcodes.GetU8(&offset); 2528 if (sizeof(float) == float_length) 2529 tmp.ResolveValue(exe_ctx, ast_context) = opcodes.GetFloat (&offset); 2530 else if (sizeof(double) == float_length) 2531 tmp.ResolveValue(exe_ctx, ast_context) = opcodes.GetDouble (&offset); 2532 else if (sizeof(long double) == float_length) 2533 tmp.ResolveValue(exe_ctx, ast_context) = opcodes.GetLongDouble (&offset); 2534 else 2535 { 2536 StreamString new_value; 2537 opcodes.Dump(&new_value, offset, eFormatBytes, 1, float_length, UINT32_MAX, DW_INVALID_ADDRESS, 0, 0); 2538 2539 if (error_ptr) 2540 error_ptr->SetErrorStringWithFormat ("DW_OP_APPLE_constf(<%u> %s) unsupported float size.\n", float_length, new_value.GetData()); 2541 return false; 2542 } 2543 tmp.SetValueType(Value::eValueTypeScalar); 2544 tmp.ClearContext(); 2545 stack.push_back(tmp); 2546 } 2547 break; 2548 //---------------------------------------------------------------------- 2549 // OPCODE: DW_OP_APPLE_clear 2550 // OPERANDS: none 2551 // DESCRIPTION: Clears the expression stack. 2552 //---------------------------------------------------------------------- 2553 case DW_OP_APPLE_clear: 2554 stack.clear(); 2555 break; 2556 2557 //---------------------------------------------------------------------- 2558 // OPCODE: DW_OP_APPLE_error 2559 // OPERANDS: none 2560 // DESCRIPTION: Pops a value off of the stack and pushed its value. 2561 // The top item on the stack must be a variable, expression variable. 2562 //---------------------------------------------------------------------- 2563 case DW_OP_APPLE_error: // 0xFF - Stops expression evaluation and returns an error (no args) 2564 if (error_ptr) 2565 error_ptr->SetErrorString ("Generic error."); 2566 return false; 2567 } 2568 } 2569 2570 if (stack.empty()) 2571 { 2572 if (error_ptr) 2573 error_ptr->SetErrorString ("Stack empty after evaluation."); 2574 return false; 2575 } 2576 else if (log) 2577 { 2578 size_t count = stack.size(); 2579 log->Printf("Stack after operation has %d values:", count); 2580 for (size_t i=0; i<count; ++i) 2581 { 2582 StreamString new_value; 2583 new_value.Printf("[%zu]", i); 2584 stack[i].Dump(&new_value); 2585 log->Printf(" %s", new_value.GetData()); 2586 } 2587 } 2588 2589 result = stack.back(); 2590 return true; // Return true on success 2591} 2592 2593