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| 1 // Copyright (c) 2011 The Native Client Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #region | |
| 6 | |
| 7 using System; | |
| 8 using System.Collections.Generic; | |
| 9 using System.Diagnostics; | |
| 10 using System.IO; | |
| 11 using System.Linq; | |
| 12 using Google.MsAd7.BaseImpl; | |
| 13 using Google.MsAd7.BaseImpl.DebugProperties; | |
| 14 using Google.MsAd7.BaseImpl.Interfaces; | |
| 15 using Google.MsAd7.BaseImpl.Interfaces.SimpleSymbolTypes; | |
| 16 using Google.NaClVsx.DebugSupport.DWARF; | |
| 17 using NaClVsx; | |
| 18 | |
| 19 #endregion | |
| 20 | |
| 21 namespace Google.NaClVsx.DebugSupport { | |
| 22 /// <summary> | |
| 23 /// The NaClSymbolProvider provides generic address and code lookups. | |
| 24 /// </summary> | |
| 25 public class NaClSymbolProvider : ISimpleSymbolProvider { | |
| 26 public NaClSymbolProvider(ISimpleDebugger dbg) { | |
| 27 BaseAddress = 0; | |
| 28 dbg_ = dbg; | |
| 29 } | |
| 30 | |
| 31 public ulong BaseAddress { get; set; } | |
| 32 | |
| 33 /// <summary> | |
| 34 /// Internally MSVX uses 0-indexed positions. However, DWARF and MSVC's ow
n user interface | |
| 35 /// do not. This function exists because having the += 1 and -= 1 calcula
tions all over the | |
| 36 /// place, is extremely error-prone and confusing. | |
| 37 /// </summary> | |
| 38 /// <param name = "dwarfLineIndex">A 1-based index.</param> | |
| 39 /// <returns>The 0-based index.</returns> | |
| 40 public static uint GetMSVCLineIndex(uint dwarfLineIndex) { | |
| 41 return dwarfLineIndex - 1; | |
| 42 } | |
| 43 | |
| 44 /// <summary> | |
| 45 /// Internally MSVX uses 0-indexed positions. However, DWARF and MSVC's ow
n user interface | |
| 46 /// do not. This function exists because having the += 1 and -= 1 calcula
tions all over the | |
| 47 /// place, is extremely error-prone and confusing. | |
| 48 /// </summary> | |
| 49 /// <param name = "msvcLineIndex">A 0-based index.</param> | |
| 50 /// <returns>The 1-based index</returns> | |
| 51 public static uint GetDwarfLineIndex(uint msvcLineIndex) { | |
| 52 return msvcLineIndex + 1; | |
| 53 } | |
| 54 | |
| 55 /// <summary> | |
| 56 /// Uses a CallFrame record from the Symbol Database to apply a set of | |
| 57 /// rules to the current registerset, in order to derive the register | |
| 58 /// state for the next outer stack frame. | |
| 59 /// This function currently uses a short cut and does not result in a | |
| 60 /// completely accurate reproduction of the outer frame. Support for | |
| 61 /// that will require a more detailed implementation of the CFI analysis | |
| 62 /// specified by DWARF and will be added as a feature later. | |
| 63 /// </summary> | |
| 64 /// <param name = "currentRegisters">The state of the registers in the | |
| 65 /// current call frame.</param> | |
| 66 /// <returns>The outer callframe's register state.</returns> | |
| 67 public RegisterSet GetPreviousFrameState(RegisterSet currentRegisters) { | |
| 68 var rip = currentRegisters["RIP"]; | |
| 69 var pc = rip - BaseAddress; | |
| 70 if (pc > BaseAddress) { | |
| 71 return null; | |
| 72 } | |
| 73 var frame = | |
| 74 db_.GetCallFrameForAddress(rip - BaseAddress); | |
| 75 if (frame == null) { | |
| 76 return null; | |
| 77 } | |
| 78 | |
| 79 var result = currentRegisters.Clone() as RegisterSet; | |
| 80 var rules = new Dictionary<int, SymbolDatabase.CallFrame.Rule>(); | |
| 81 | |
| 82 // Find all of the rules that apply at the current address. | |
| 83 // Rules are stored in ascending order of address. If two | |
| 84 // rules exist for the same register, then the one with the | |
| 85 // highest address wins. | |
| 86 foreach (var rule in frame.Rules) { | |
| 87 if (rule.Address > rip) { | |
| 88 break; | |
| 89 } | |
| 90 rules[rule.RegisterId] = rule; | |
| 91 } | |
| 92 | |
| 93 // First we will hit the CFA rule and calculate the value of the previous | |
| 94 // Frame offset. Once we have that, the rest of the registers are | |
| 95 // updated using memory locations that are relative to the previous CFA. | |
| 96 // TODO(mlinck): This seems to end up with stackframes that represent the | |
| 97 // functions' return locations, not the call site. | |
| 98 foreach (var rule in rules.Values) { | |
| 99 switch (rule.RuleType) { | |
| 100 case IDwarfReader.CfiRuleType.Expression: | |
| 101 throw new NotImplementedException(); | |
| 102 case IDwarfReader.CfiRuleType.Offset: | |
| 103 var addr = | |
| 104 (ulong) ((long) result[rule.BaseRegister] + rule.Offset); | |
| 105 Debug.WriteLine( | |
| 106 "SymbolProvider:: result[rule.BaseRegister]: " + | |
| 107 String.Format( | |
| 108 "{0,4:X}", | |
| 109 result[rule.BaseRegister]) + | |
| 110 " rule.Offset: " + rule.Offset + | |
| 111 " addr: " + String.Format("{0,4:X}", addr) + | |
| 112 " rule.Address: " + String.Format( | |
| 113 "{0,4:X}", | |
| 114 rule.Address) + | |
| 115 " BaseAddress: " + String.Format( | |
| 116 "{0,4:X}", | |
| 117 BaseAddress)); | |
| 118 var newValue = dbg_.GetU64(addr - BaseAddress); | |
| 119 result[rule.RegisterId] = newValue; | |
| 120 break; | |
| 121 case IDwarfReader.CfiRuleType.Register: | |
| 122 result[rule.RegisterId] = result[rule.BaseRegister]; | |
| 123 break; | |
| 124 case IDwarfReader.CfiRuleType.SameValue: | |
| 125 // this rule seems to exist only to restore values that | |
| 126 // have gotten munged earlier. | |
| 127 result[rule.RegisterId] = currentRegisters[rule.RegisterId]; | |
| 128 break; | |
| 129 case IDwarfReader.CfiRuleType.Undefined: | |
| 130 // do nothing | |
| 131 break; | |
| 132 case IDwarfReader.CfiRuleType.ValExpression: | |
| 133 throw new NotImplementedException(); | |
| 134 case IDwarfReader.CfiRuleType.ValOffset: | |
| 135 var baseValue = (long) result[rule.BaseRegister]; | |
| 136 var offset = (long) rule.Offset; | |
| 137 newValue = (ulong) (baseValue + offset); | |
| 138 result[rule.RegisterId] = newValue; | |
| 139 break; | |
| 140 default: | |
| 141 throw new IndexOutOfRangeException("Bad rule type for CFI"); | |
| 142 } | |
| 143 } | |
| 144 return result; | |
| 145 } | |
| 146 | |
| 147 /// <summary> | |
| 148 /// Attempts to determine the symbol type for the symbol at the given addr
ess. | |
| 149 /// </summary> | |
| 150 /// <param name = "address">An address. Notes: This address needs to be an
address of a DIE | |
| 151 /// for an actual symbol. The address is the address of the DIE in the bi
nary file, also | |
| 152 /// known as its "key" in the Entries dictionary of the SymbolDatabase</pa
ram> | |
| 153 /// <returns>The windows debugger SymbolType.</returns> | |
| 154 public SymbolType GetSymbolType(ulong address) { | |
| 155 var result = new SymbolType { | |
| 156 Key = 0, | |
| 157 Name = "unknown", | |
| 158 SizeOf = 0, | |
| 159 TypeOf = BaseType.Unknown, | |
| 160 }; | |
| 161 DebugInfoEntry symbolEntry; | |
| 162 | |
| 163 // If we do not find this symbol, then return unknown. | |
| 164 if (!db_.Entries.TryGetValue(address, out symbolEntry)) { | |
| 165 return result; | |
| 166 } | |
| 167 | |
| 168 | |
| 169 if (symbolEntry.Attributes.ContainsKey(DwarfAttribute.DW_AT_type)) { | |
| 170 var val = | |
| 171 (DwarfReference) symbolEntry.Attributes[DwarfAttribute.DW_AT_type]; | |
| 172 result.Key = val.offset; | |
| 173 } else { | |
| 174 return result; | |
| 175 } | |
| 176 result.Name = ""; | |
| 177 // Process the linked list of modifiers as right associative to the base t
ype; | |
| 178 while (symbolEntry.Attributes.ContainsKey(DwarfAttribute.DW_AT_type)) { | |
| 179 var val = | |
| 180 (DwarfReference) symbolEntry.Attributes[DwarfAttribute.DW_AT_type]; | |
| 181 | |
| 182 if (!db_.Entries.TryGetValue(val.offset, out symbolEntry)) { | |
| 183 result.Key = 0; | |
| 184 result.Name = null; | |
| 185 return result; | |
| 186 } | |
| 187 | |
| 188 // Set the size of the symbol to the "right most" sized component such t
hat | |
| 189 // char *p is size 4 since '*' is size 4. | |
| 190 if (symbolEntry.Attributes.ContainsKey(DwarfAttribute.DW_AT_byte_size))
{ | |
| 191 var attrib = symbolEntry.Attributes[DwarfAttribute.DW_AT_byte_size]; | |
| 192 if (0 == result.SizeOf) { | |
| 193 result.SizeOf = (uint) (ulong) attrib; | |
| 194 } | |
| 195 } | |
| 196 | |
| 197 switch (symbolEntry.Tag) { | |
| 198 case DwarfTag.DW_TAG_const_type: | |
| 199 result.Name = " const" + result.Name; | |
| 200 break; | |
| 201 | |
| 202 case DwarfTag.DW_TAG_pointer_type: | |
| 203 result.Name = " *" + result.Name; | |
| 204 if (BaseType.Unknown == result.TypeOf) { | |
| 205 result.TypeOf = BaseType.Pointer; | |
| 206 } | |
| 207 break; | |
| 208 | |
| 209 case DwarfTag.DW_TAG_reference_type: | |
| 210 result.Name = " &" + result.Name; | |
| 211 break; | |
| 212 | |
| 213 case DwarfTag.DW_TAG_volatile_type: | |
| 214 result.Name = " volatile" + result.Name; | |
| 215 break; | |
| 216 | |
| 217 case DwarfTag.DW_TAG_restrict_type: | |
| 218 result.Name = " restrict" + result.Name; | |
| 219 break; | |
| 220 | |
| 221 case DwarfTag.DW_TAG_base_type: | |
| 222 result.Name = | |
| 223 (string) symbolEntry.Attributes[DwarfAttribute.DW_AT_name] + | |
| 224 result.Name; | |
| 225 if (BaseType.Unknown == result.TypeOf) { | |
| 226 var enc = | |
| 227 (DwarfEncoding) | |
| 228 (ulong) symbolEntry.Attributes[DwarfAttribute.DW_AT_encoding]; | |
| 229 switch (enc) { | |
| 230 case DwarfEncoding.DW_ATE_address: | |
| 231 result.TypeOf = BaseType.Pointer; | |
| 232 break; | |
| 233 | |
| 234 case DwarfEncoding.DW_ATE_boolean: | |
| 235 result.TypeOf = BaseType.Bool; | |
| 236 break; | |
| 237 | |
| 238 case DwarfEncoding.DW_ATE_signed_char: | |
| 239 case DwarfEncoding.DW_ATE_unsigned_char: | |
| 240 result.TypeOf = BaseType.Char; | |
| 241 break; | |
| 242 | |
| 243 case DwarfEncoding.DW_ATE_signed: | |
| 244 result.TypeOf = BaseType.Int; | |
| 245 break; | |
| 246 | |
| 247 case DwarfEncoding.DW_ATE_unsigned: | |
| 248 result.TypeOf = BaseType.UInt; | |
| 249 break; | |
| 250 | |
| 251 case DwarfEncoding.DW_ATE_float: | |
| 252 result.TypeOf = BaseType.Float; | |
| 253 break; | |
| 254 } | |
| 255 } | |
| 256 return result; | |
| 257 | |
| 258 case DwarfTag.DW_TAG_structure_type: | |
| 259 if (symbolEntry.HasAttribute(DwarfAttribute.DW_AT_name)) { | |
| 260 result.Name = | |
| 261 (string) symbolEntry.Attributes[DwarfAttribute.DW_AT_name] + | |
| 262 result.Name; | |
| 263 } | |
| 264 if (BaseType.Unknown == result.TypeOf) { | |
| 265 result.TypeOf = BaseType.Struct; | |
| 266 } | |
| 267 break; | |
| 268 | |
| 269 case DwarfTag.DW_TAG_subroutine_type: { | |
| 270 result.Name = " (" + result.Name.TrimStart(null) + ")("; | |
| 271 foreach ( | |
| 272 var parms in | |
| 273 db_.GetChildrenForEntry(val.offset)) { | |
| 274 if (parms.Tag == DwarfTag.DW_TAG_formal_parameter) { | |
| 275 result.Name += GetSymbolType(parms.Key).Name + ", "; | |
| 276 } | |
| 277 } | |
| 278 char[] trim = {',', ' '}; | |
| 279 result.Name = result.Name.TrimEnd(trim) + ")"; | |
| 280 break; | |
| 281 } | |
| 282 | |
| 283 case DwarfTag.DW_TAG_typedef: | |
| 284 result.Name = | |
| 285 (string) symbolEntry.Attributes[DwarfAttribute.DW_AT_name] + | |
| 286 result.Name; | |
| 287 break; | |
| 288 | |
| 289 default: | |
| 290 result.Name = "Parse Err"; | |
| 291 result.Key = 0; | |
| 292 break; | |
| 293 } | |
| 294 } | |
| 295 | |
| 296 return result; | |
| 297 } | |
| 298 | |
| 299 #region Implementation of ISimpleSymbolProvider | |
| 300 | |
| 301 public IBreakpointInfo GetBreakpointInfo() { | |
| 302 return new BreakpointInfo(db_, this); | |
| 303 } | |
| 304 | |
| 305 public ulong GetBaseAddress() { | |
| 306 return BaseAddress; | |
| 307 } | |
| 308 | |
| 309 public IEnumerable<ulong> AddressesFromPosition(DocumentPosition pos) { | |
| 310 var fname = Path.GetFileName(pos.Path); | |
| 311 if (!db_.SourceFilesByFilename.ContainsKey(fname)) { | |
| 312 return null; | |
| 313 } | |
| 314 | |
| 315 var files = db_.SourceFilesByFilename[fname]; | |
| 316 | |
| 317 if (files.Count() > 1) { | |
| 318 // TODO(ilewis): disambiguate | |
| 319 } else if (files.Count() == 0) { | |
| 320 return null; | |
| 321 } | |
| 322 | |
| 323 // Remember the path that was passed in, since that's where | |
| 324 // the current debugging session knows where to find this | |
| 325 // file | |
| 326 files[0].CurrentAbsolutePath = pos.Path; | |
| 327 | |
| 328 // Internally, MSVC uses zero-based lines. This is in contrast | |
| 329 // to both DWARF and MSVC's own user interface, but whatever. | |
| 330 // | |
| 331 var line = pos.BeginPos.dwLine + 1; | |
| 332 | |
| 333 return from loc in db_.LocationsByFile[files.First().Key] | |
| 334 where loc.Line == line | |
| 335 select loc.StartAddress + BaseAddress; | |
| 336 } | |
| 337 | |
| 338 | |
| 339 public DocumentPosition PositionFromAddress(ulong address) { | |
| 340 var loc = | |
| 341 db_.GetLocationForAddress(address - BaseAddress); | |
| 342 if (loc != null) { | |
| 343 // The DWARF line is 1-based; switch to zero-based for MSVC's benefit. | |
| 344 var line = loc.Line - 1; | |
| 345 return | |
| 346 new DocumentPosition( | |
| 347 db_.Files[loc.SourceFileKey].CurrentAbsolutePath, line); | |
| 348 } | |
| 349 return null; | |
| 350 } | |
| 351 | |
| 352 public IEnumerable<UInt64> GetAddressesInScope(UInt64 programCounter) { | |
| 353 var result = new List<UInt64>(); | |
| 354 programCounter -= BaseAddress; | |
| 355 | |
| 356 // Get the scope, current function, and frame pointer | |
| 357 var scopeEntry = | |
| 358 db_.GetScopeForAddress(programCounter); | |
| 359 if (scopeEntry == null) { | |
| 360 return result; | |
| 361 } | |
| 362 | |
| 363 // Find the parent most DIE which represents this function | |
| 364 var fnEntry = scopeEntry; | |
| 365 while (fnEntry.Tag != DwarfTag.DW_TAG_subprogram | |
| 366 && fnEntry.OuterScope != null) { | |
| 367 fnEntry = fnEntry.OuterScope; | |
| 368 } | |
| 369 | |
| 370 var functionLowPC = | |
| 371 (ulong) | |
| 372 fnEntry.Attributes.GetValueOrDefault(DwarfAttribute.DW_AT_low_pc, 0); | |
| 373 var fnMax = | |
| 374 (ulong) | |
| 375 fnEntry.Attributes.GetValueOrDefault(DwarfAttribute.DW_AT_high_pc, 0); | |
| 376 | |
| 377 | |
| 378 functionLowPC += BaseAddress; | |
| 379 fnMax += BaseAddress; | |
| 380 while (functionLowPC < fnMax) { | |
| 381 result.Add(functionLowPC); | |
| 382 functionLowPC = GetNextLocation(functionLowPC); | |
| 383 } | |
| 384 | |
| 385 return result; | |
| 386 } | |
| 387 | |
| 388 /// <summary> | |
| 389 /// This function retrieves the DebugInformationEntries for symbols that | |
| 390 /// are in scope at a given instruction address. | |
| 391 /// </summary> | |
| 392 /// <param name = "instructionAddress">The address for whose scope symbols | |
| 393 /// are being requested.</param> | |
| 394 /// <returns>A list of symbol descriptors for all the symbols that are in | |
| 395 /// scope at this location in the program.</returns> | |
| 396 public IEnumerable<Symbol> GetSymbolsInScope(ulong instructionAddress) { | |
| 397 var result = new List<Symbol>(); | |
| 398 // Adjust for the base of the untrusted code space. | |
| 399 instructionAddress -= BaseAddress; | |
| 400 | |
| 401 // Get the scope, current function, and frame pointer. The frame pointer | |
| 402 // will be used to determine what source code location applies to our | |
| 403 // current scope. | |
| 404 var scopeEntry = db_.GetScopeForAddress(instructionAddress); | |
| 405 if (scopeEntry == null) { | |
| 406 return result; | |
| 407 } | |
| 408 var functionEntry = | |
| 409 scopeEntry.GetNearestAncestorWithTag(DwarfTag.DW_TAG_subprogram); | |
| 410 var functionFrameBase = functionEntry.GetFrameBase(); | |
| 411 | |
| 412 // The code locations are given addresses relative to the compilation | |
| 413 // unit that contains them, so we have to make sure we can come up with | |
| 414 // that same offset. | |
| 415 var compilationUnitEntry = | |
| 416 functionEntry.GetNearestAncestorWithTag(DwarfTag.DW_TAG_compile_unit); | |
| 417 ulong compilationUnitLowPC = 0; | |
| 418 if (compilationUnitEntry.HasAttribute(DwarfAttribute.DW_AT_low_pc)) { | |
| 419 compilationUnitLowPC = compilationUnitEntry.GetLowPC(); | |
| 420 } else if (compilationUnitEntry.HasAttribute(DwarfAttribute.DW_AT_ranges))
{ | |
| 421 // This should never really happen. In case it does, it warrants some | |
| 422 // explanation. The reason we look for the functionFrameBase is because | |
| 423 // we need the rangelist entry for the location of the function, within | |
| 424 // the compilation unit. Any addresses in nested scopes would then be | |
| 425 // treated as relative addresses to that offset. | |
| 426 var rangeListEntry = db_.GetRangeForAddress(functionFrameBase, compilati
onUnitEntry); | |
| 427 if (rangeListEntry != null) { | |
| 428 compilationUnitLowPC += rangeListEntry.LowPC; | |
| 429 } | |
| 430 } | |
| 431 | |
| 432 var codeAddress = instructionAddress - compilationUnitLowPC; | |
| 433 // The VM inputs object handles feeding the VM whatever it asks for. | |
| 434 // This VM will execute the DWARF state machine to do any necessary | |
| 435 // low-level address calculations. | |
| 436 var vmInputs = new VirtualMachineInputs(dbg_, 0); | |
| 437 PrimeVMInputs(codeAddress, functionFrameBase, vmInputs); | |
| 438 | |
| 439 while (scopeEntry != null) { | |
| 440 foreach ( | |
| 441 var entry in | |
| 442 db_.GetChildrenForEntry(scopeEntry.Key)) { | |
| 443 // The assumption here is that all useful symbols have a location and | |
| 444 // a name. | |
| 445 if (entry.Attributes.ContainsKey(DwarfAttribute.DW_AT_location) | |
| 446 && entry.Attributes.ContainsKey(DwarfAttribute.DW_AT_name)) { | |
| 447 var name = (string) entry.Attributes[DwarfAttribute.DW_AT_name]; | |
| 448 var loc = entry.Attributes[DwarfAttribute.DW_AT_location] as byte[]; | |
| 449 // Program counter will not be used by ResolveLocation in this case | |
| 450 // because the loc we're handing in is always a byte array. | |
| 451 var symbolAddr = ResolveLocation(loc, vmInputs); | |
| 452 // store the symbolAddr and variable name. Note that symbolAddr is | |
| 453 // relative to the base address of the NaCl app. The base address | |
| 454 // is something like 0xC00000000, but the base gets added to this | |
| 455 // relative address (symbolAddr) later in functions like GetMemory | |
| 456 // (located in NaClDebugger.cs). | |
| 457 result.Add( | |
| 458 new Symbol { | |
| 459 Key = entry.Key, | |
| 460 Name = name, | |
| 461 Offset = symbolAddr, | |
| 462 TypeOf = GetSymbolType(entry.Key) | |
| 463 }); | |
| 464 } | |
| 465 } | |
| 466 scopeEntry = scopeEntry.OuterScope; | |
| 467 } | |
| 468 return result; | |
| 469 } | |
| 470 | |
| 471 /// <summary> | |
| 472 /// Determines what function the given address is in. | |
| 473 /// </summary> | |
| 474 /// <param name = "address">The address whose function is needed.</param> | |
| 475 /// <returns>The windows debugger representation of the containing function.
</returns> | |
| 476 public Function FunctionFromAddress(ulong address) { | |
| 477 var result = new Function { | |
| 478 Id = 0, | |
| 479 Name = "<unknown function>", | |
| 480 }; | |
| 481 | |
| 482 var scopeEntry = | |
| 483 db_.GetScopeForAddress(address - BaseAddress); | |
| 484 if (null != scopeEntry) { | |
| 485 var fnEntry = | |
| 486 scopeEntry.GetNearestAncestorWithTag(DwarfTag.DW_TAG_subprogram); | |
| 487 if (null != fnEntry) { | |
| 488 result.Id = fnEntry.Key; | |
| 489 result.Name = | |
| 490 (string) fnEntry.Attributes[DwarfAttribute.DW_AT_name]; | |
| 491 } | |
| 492 } | |
| 493 | |
| 494 return result; | |
| 495 } | |
| 496 | |
| 497 public FunctionDetails GetFunctionDetails(Function fn) { | |
| 498 throw new NotImplementedException(); | |
| 499 } | |
| 500 | |
| 501 public bool LoadModule(string path, ulong loadOffset, out string status) { | |
| 502 // TODO(ilewis): this should be per-module, not per-database (unless | |
| 503 // we decide to make database a per-module thing too) | |
| 504 BaseAddress = loadOffset; | |
| 505 try { | |
| 506 DwarfParser.DwarfParseElf(path, new DwarfReaderImpl(db_)); | |
| 507 db_.BuildIndices(); | |
| 508 status = "ELF/DWARF symbols loaded"; | |
| 509 return true; | |
| 510 } | |
| 511 catch (Exception e) { | |
| 512 status = e.Message; | |
| 513 return false; | |
| 514 } | |
| 515 } | |
| 516 | |
| 517 public ulong GetNextLocation(ulong addr) { | |
| 518 var loc = | |
| 519 db_.GetLocationForAddress(addr - BaseAddress); | |
| 520 return loc.StartAddress + loc.Length + BaseAddress; | |
| 521 } | |
| 522 | |
| 523 #endregion | |
| 524 | |
| 525 #region ISimpleSymbolProvider Members | |
| 526 | |
| 527 public String SymbolValueToString(ulong key, ArraySegment<Byte> arrBytes) { | |
| 528 var result = GetSymbolType(key); | |
| 529 var bytes = arrBytes.Array; | |
| 530 | |
| 531 // If we don't have enough data | |
| 532 if (bytes.Count() < result.SizeOf) { | |
| 533 return "INVALID"; | |
| 534 } | |
| 535 | |
| 536 // Or if we were unable to determine the type | |
| 537 if (result.TypeOf == BaseType.Unknown) { | |
| 538 return "INVALID"; | |
| 539 } | |
| 540 | |
| 541 Int64 i64 = 0; | |
| 542 double d64 = 0; | |
| 543 | |
| 544 try { | |
| 545 switch (result.SizeOf) { | |
| 546 case 1: | |
| 547 // We don't need to convert to number first because the switch | |
| 548 // statement below will convert byte[0] to string val. | |
| 549 break; | |
| 550 | |
| 551 case 2: | |
| 552 i64 = BitConverter.ToInt16(bytes, 0); | |
| 553 break; | |
| 554 | |
| 555 case 4: | |
| 556 i64 = BitConverter.ToInt32(bytes, 0); | |
| 557 d64 = BitConverter.ToSingle(bytes, 0); | |
| 558 break; | |
| 559 | |
| 560 case 8: | |
| 561 i64 = BitConverter.ToInt64(bytes, 0); | |
| 562 d64 = BitConverter.ToDouble(bytes, 0); | |
| 563 break; | |
| 564 } | |
| 565 } | |
| 566 catch (Exception e) { | |
| 567 // Without a catch here, the VSX SDK catches the exception and we | |
| 568 // just don't get a value back... Printing helps us realize this | |
| 569 // is happening (when we had a bad conversion for case 1 previously) | |
| 570 // and also lets us set a breakpoint inside the catch. | |
| 571 Debug.WriteLine( | |
| 572 "An exception was caught when calling BitConverter!" + | |
| 573 e); | |
| 574 } | |
| 575 | |
| 576 | |
| 577 var typeInfo = result.TypeOf; | |
| 578 Debug.WriteLine("typeOf: " + typeInfo + " size: " + result.SizeOf); | |
| 579 switch (result.TypeOf) { | |
| 580 case BaseType.Pointer: | |
| 581 return i64.ToString("X"); | |
| 582 | |
| 583 case BaseType.Bool: | |
| 584 if (0 != i64) { | |
| 585 return "True"; | |
| 586 } else { | |
| 587 return "False"; | |
| 588 } | |
| 589 | |
| 590 case BaseType.Char: | |
| 591 return bytes[0].ToString(); | |
| 592 | |
| 593 case BaseType.Int: | |
| 594 return i64.ToString(); | |
| 595 | |
| 596 case BaseType.UInt: | |
| 597 return ((UInt64) i64).ToString(); | |
| 598 | |
| 599 case BaseType.Float: | |
| 600 return d64.ToString(); | |
| 601 | |
| 602 case BaseType.Struct: | |
| 603 return "{" + result.Name + "}"; | |
| 604 } | |
| 605 return "INVALID"; | |
| 606 } | |
| 607 | |
| 608 #endregion | |
| 609 | |
| 610 #region Private Implementation | |
| 611 | |
| 612 readonly SymbolDatabase db_ = new SymbolDatabase(); | |
| 613 private readonly ISimpleDebugger dbg_; | |
| 614 | |
| 615 #endregion | |
| 616 | |
| 617 #region Private Implementation | |
| 618 | |
| 619 /// <summary> | |
| 620 /// Calculates the address on the stack, of a given location in the | |
| 621 /// instruction queue. | |
| 622 /// </summary> | |
| 623 /// <param name = "loc">The location in the instruction space.</param> | |
| 624 /// <param name = "vm">The virtual machine that is to be used to calculate | |
| 625 /// the stack address. It must be primed with context.</param> | |
| 626 /// <returns>The stack address corresponding to loc.</returns> | |
| 627 private static ulong ResolveLocation(byte[] loc, | |
| 628 VirtualMachineInputs vm) { | |
| 629 if (vm == null) { | |
| 630 throw new ArgumentNullException("vm"); | |
| 631 } | |
| 632 // A byte[] location is a Dwarf VM program, not an actual location. | |
| 633 // We need to run the VM and (possibly) supply inputs. | |
| 634 var stackAddress = DwarfParser.DwarfParseVM(vm, loc); | |
| 635 | |
| 636 if (stackAddress < (ulong) DwarfOpcode.DW_OP_regX) { | |
| 637 Debug.WriteLine("WARNING: Register vars not currently supported"); | |
| 638 } | |
| 639 return stackAddress; | |
| 640 } | |
| 641 | |
| 642 /// <summary> | |
| 643 /// Primes the inputs that will be handed to the DWARF VM, by giving it | |
| 644 /// relevant context. | |
| 645 /// </summary> | |
| 646 /// <param name = "codeAddress">The code address for which context will be | |
| 647 /// needed.</param> | |
| 648 /// <param name = "functionFrameBase">The frame base of the function that | |
| 649 /// contains the code address.</param> | |
| 650 /// <param name = "vmInputs">This parameter is modified. It is primed with | |
| 651 /// A framebase that is calculated for the current context so that future | |
| 652 /// DWARF address calculations can be peformed.</param> | |
| 653 private void PrimeVMInputs(ulong codeAddress, | |
| 654 ulong functionFrameBase, | |
| 655 VirtualMachineInputs vmInputs) { | |
| 656 var frameBase = ulong.MaxValue; | |
| 657 var loclist = | |
| 658 db_.LocLists[functionFrameBase]; | |
| 659 foreach (var locListEntry in loclist) { | |
| 660 if (locListEntry.StartAddress == ulong.MaxValue) { | |
| 661 frameBase = locListEntry.EndAddress; | |
| 662 break; | |
| 663 } | |
| 664 // Try to determine whether this is the address of a symbol and | |
| 665 // return the referenced address in memory. | |
| 666 if (locListEntry.StartAddress <= codeAddress | |
| 667 && codeAddress <= locListEntry.EndAddress) { | |
| 668 frameBase = DwarfParser.DwarfParseVM(vmInputs, locListEntry.Data); | |
| 669 break; | |
| 670 } | |
| 671 } | |
| 672 | |
| 673 if (frameBase < (ulong) DwarfOpcode.DW_OP_regX) { | |
| 674 Debug.WriteLine("WARNING: Register vars not currently supported"); | |
| 675 } | |
| 676 vmInputs.FrameBase = frameBase; | |
| 677 } | |
| 678 | |
| 679 #endregion | |
| 680 } | |
| 681 } | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 10928195:
First round of dead file removal (Closed)
Base URL: https://github.com/samclegg/nativeclient-sdk.git@master