1 //===-- DWARFExpression.cpp -------------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "lldb/Expression/DWARFExpression.h"
18 #include "lldb/Core/DataEncoder.h"
19 #include "lldb/Core/dwarf.h"
20 #include "lldb/Core/Log.h"
21 #include "lldb/Core/RegisterValue.h"
22 #include "lldb/Core/StreamString.h"
23 #include "lldb/Core/Scalar.h"
24 #include "lldb/Core/Value.h"
25 #include "lldb/Core/VMRange.h"
27 #include "lldb/Expression/ClangExpressionDeclMap.h"
28 #include "lldb/Expression/ClangExpressionVariable.h"
30 #include "lldb/Host/Endian.h"
31 #include "lldb/Host/Host.h"
33 #include "lldb/lldb-private-log.h"
35 #include "lldb/Target/ABI.h"
36 #include "lldb/Target/ExecutionContext.h"
37 #include "lldb/Target/Process.h"
38 #include "lldb/Target/RegisterContext.h"
39 #include "lldb/Target/StackFrame.h"
40 #include "lldb/Target/StackID.h"
41 #include "lldb/Target/Thread.h"
44 using namespace lldb_private;
46 // TODO- why is this also defined (in a better way) in DWARFDefines.cpp?
48 DW_OP_value_to_name (uint32_t val)
50 static char invalid[100];
52 case 0x03: return "DW_OP_addr";
53 case 0x06: return "DW_OP_deref";
54 case 0x08: return "DW_OP_const1u";
55 case 0x09: return "DW_OP_const1s";
56 case 0x0a: return "DW_OP_const2u";
57 case 0x0b: return "DW_OP_const2s";
58 case 0x0c: return "DW_OP_const4u";
59 case 0x0d: return "DW_OP_const4s";
60 case 0x0e: return "DW_OP_const8u";
61 case 0x0f: return "DW_OP_const8s";
62 case 0x10: return "DW_OP_constu";
63 case 0x11: return "DW_OP_consts";
64 case 0x12: return "DW_OP_dup";
65 case 0x13: return "DW_OP_drop";
66 case 0x14: return "DW_OP_over";
67 case 0x15: return "DW_OP_pick";
68 case 0x16: return "DW_OP_swap";
69 case 0x17: return "DW_OP_rot";
70 case 0x18: return "DW_OP_xderef";
71 case 0x19: return "DW_OP_abs";
72 case 0x1a: return "DW_OP_and";
73 case 0x1b: return "DW_OP_div";
74 case 0x1c: return "DW_OP_minus";
75 case 0x1d: return "DW_OP_mod";
76 case 0x1e: return "DW_OP_mul";
77 case 0x1f: return "DW_OP_neg";
78 case 0x20: return "DW_OP_not";
79 case 0x21: return "DW_OP_or";
80 case 0x22: return "DW_OP_plus";
81 case 0x23: return "DW_OP_plus_uconst";
82 case 0x24: return "DW_OP_shl";
83 case 0x25: return "DW_OP_shr";
84 case 0x26: return "DW_OP_shra";
85 case 0x27: return "DW_OP_xor";
86 case 0x2f: return "DW_OP_skip";
87 case 0x28: return "DW_OP_bra";
88 case 0x29: return "DW_OP_eq";
89 case 0x2a: return "DW_OP_ge";
90 case 0x2b: return "DW_OP_gt";
91 case 0x2c: return "DW_OP_le";
92 case 0x2d: return "DW_OP_lt";
93 case 0x2e: return "DW_OP_ne";
94 case 0x30: return "DW_OP_lit0";
95 case 0x31: return "DW_OP_lit1";
96 case 0x32: return "DW_OP_lit2";
97 case 0x33: return "DW_OP_lit3";
98 case 0x34: return "DW_OP_lit4";
99 case 0x35: return "DW_OP_lit5";
100 case 0x36: return "DW_OP_lit6";
101 case 0x37: return "DW_OP_lit7";
102 case 0x38: return "DW_OP_lit8";
103 case 0x39: return "DW_OP_lit9";
104 case 0x3a: return "DW_OP_lit10";
105 case 0x3b: return "DW_OP_lit11";
106 case 0x3c: return "DW_OP_lit12";
107 case 0x3d: return "DW_OP_lit13";
108 case 0x3e: return "DW_OP_lit14";
109 case 0x3f: return "DW_OP_lit15";
110 case 0x40: return "DW_OP_lit16";
111 case 0x41: return "DW_OP_lit17";
112 case 0x42: return "DW_OP_lit18";
113 case 0x43: return "DW_OP_lit19";
114 case 0x44: return "DW_OP_lit20";
115 case 0x45: return "DW_OP_lit21";
116 case 0x46: return "DW_OP_lit22";
117 case 0x47: return "DW_OP_lit23";
118 case 0x48: return "DW_OP_lit24";
119 case 0x49: return "DW_OP_lit25";
120 case 0x4a: return "DW_OP_lit26";
121 case 0x4b: return "DW_OP_lit27";
122 case 0x4c: return "DW_OP_lit28";
123 case 0x4d: return "DW_OP_lit29";
124 case 0x4e: return "DW_OP_lit30";
125 case 0x4f: return "DW_OP_lit31";
126 case 0x50: return "DW_OP_reg0";
127 case 0x51: return "DW_OP_reg1";
128 case 0x52: return "DW_OP_reg2";
129 case 0x53: return "DW_OP_reg3";
130 case 0x54: return "DW_OP_reg4";
131 case 0x55: return "DW_OP_reg5";
132 case 0x56: return "DW_OP_reg6";
133 case 0x57: return "DW_OP_reg7";
134 case 0x58: return "DW_OP_reg8";
135 case 0x59: return "DW_OP_reg9";
136 case 0x5a: return "DW_OP_reg10";
137 case 0x5b: return "DW_OP_reg11";
138 case 0x5c: return "DW_OP_reg12";
139 case 0x5d: return "DW_OP_reg13";
140 case 0x5e: return "DW_OP_reg14";
141 case 0x5f: return "DW_OP_reg15";
142 case 0x60: return "DW_OP_reg16";
143 case 0x61: return "DW_OP_reg17";
144 case 0x62: return "DW_OP_reg18";
145 case 0x63: return "DW_OP_reg19";
146 case 0x64: return "DW_OP_reg20";
147 case 0x65: return "DW_OP_reg21";
148 case 0x66: return "DW_OP_reg22";
149 case 0x67: return "DW_OP_reg23";
150 case 0x68: return "DW_OP_reg24";
151 case 0x69: return "DW_OP_reg25";
152 case 0x6a: return "DW_OP_reg26";
153 case 0x6b: return "DW_OP_reg27";
154 case 0x6c: return "DW_OP_reg28";
155 case 0x6d: return "DW_OP_reg29";
156 case 0x6e: return "DW_OP_reg30";
157 case 0x6f: return "DW_OP_reg31";
158 case 0x70: return "DW_OP_breg0";
159 case 0x71: return "DW_OP_breg1";
160 case 0x72: return "DW_OP_breg2";
161 case 0x73: return "DW_OP_breg3";
162 case 0x74: return "DW_OP_breg4";
163 case 0x75: return "DW_OP_breg5";
164 case 0x76: return "DW_OP_breg6";
165 case 0x77: return "DW_OP_breg7";
166 case 0x78: return "DW_OP_breg8";
167 case 0x79: return "DW_OP_breg9";
168 case 0x7a: return "DW_OP_breg10";
169 case 0x7b: return "DW_OP_breg11";
170 case 0x7c: return "DW_OP_breg12";
171 case 0x7d: return "DW_OP_breg13";
172 case 0x7e: return "DW_OP_breg14";
173 case 0x7f: return "DW_OP_breg15";
174 case 0x80: return "DW_OP_breg16";
175 case 0x81: return "DW_OP_breg17";
176 case 0x82: return "DW_OP_breg18";
177 case 0x83: return "DW_OP_breg19";
178 case 0x84: return "DW_OP_breg20";
179 case 0x85: return "DW_OP_breg21";
180 case 0x86: return "DW_OP_breg22";
181 case 0x87: return "DW_OP_breg23";
182 case 0x88: return "DW_OP_breg24";
183 case 0x89: return "DW_OP_breg25";
184 case 0x8a: return "DW_OP_breg26";
185 case 0x8b: return "DW_OP_breg27";
186 case 0x8c: return "DW_OP_breg28";
187 case 0x8d: return "DW_OP_breg29";
188 case 0x8e: return "DW_OP_breg30";
189 case 0x8f: return "DW_OP_breg31";
190 case 0x90: return "DW_OP_regx";
191 case 0x91: return "DW_OP_fbreg";
192 case 0x92: return "DW_OP_bregx";
193 case 0x93: return "DW_OP_piece";
194 case 0x94: return "DW_OP_deref_size";
195 case 0x95: return "DW_OP_xderef_size";
196 case 0x96: return "DW_OP_nop";
197 case 0x97: return "DW_OP_push_object_address";
198 case 0x98: return "DW_OP_call2";
199 case 0x99: return "DW_OP_call4";
200 case 0x9a: return "DW_OP_call_ref";
201 // case DW_OP_APPLE_array_ref: return "DW_OP_APPLE_array_ref";
202 // case DW_OP_APPLE_extern: return "DW_OP_APPLE_extern";
203 case DW_OP_APPLE_uninit: return "DW_OP_APPLE_uninit";
204 // case DW_OP_APPLE_assign: return "DW_OP_APPLE_assign";
205 // case DW_OP_APPLE_address_of: return "DW_OP_APPLE_address_of";
206 // case DW_OP_APPLE_value_of: return "DW_OP_APPLE_value_of";
207 // case DW_OP_APPLE_deref_type: return "DW_OP_APPLE_deref_type";
208 // case DW_OP_APPLE_expr_local: return "DW_OP_APPLE_expr_local";
209 // case DW_OP_APPLE_constf: return "DW_OP_APPLE_constf";
210 // case DW_OP_APPLE_scalar_cast: return "DW_OP_APPLE_scalar_cast";
211 // case DW_OP_APPLE_clang_cast: return "DW_OP_APPLE_clang_cast";
212 // case DW_OP_APPLE_clear: return "DW_OP_APPLE_clear";
213 // case DW_OP_APPLE_error: return "DW_OP_APPLE_error";
215 snprintf (invalid, sizeof(invalid), "Unknown DW_OP constant: 0x%x", val);
221 //----------------------------------------------------------------------
222 // DWARFExpression constructor
223 //----------------------------------------------------------------------
224 DWARFExpression::DWARFExpression() :
227 m_reg_kind (eRegisterKindDWARF),
228 m_loclist_slide (LLDB_INVALID_ADDRESS)
232 DWARFExpression::DWARFExpression(const DWARFExpression& rhs) :
233 m_module_wp(rhs.m_module_wp),
235 m_reg_kind (rhs.m_reg_kind),
236 m_loclist_slide(rhs.m_loclist_slide)
241 DWARFExpression::DWARFExpression(lldb::ModuleSP module_sp, const DataExtractor& data, lldb::offset_t data_offset, lldb::offset_t data_length) :
243 m_data(data, data_offset, data_length),
244 m_reg_kind (eRegisterKindDWARF),
245 m_loclist_slide(LLDB_INVALID_ADDRESS)
248 m_module_wp = module_sp;
251 //----------------------------------------------------------------------
253 //----------------------------------------------------------------------
254 DWARFExpression::~DWARFExpression()
260 DWARFExpression::IsValid() const
262 return m_data.GetByteSize() > 0;
266 DWARFExpression::SetOpcodeData (const DataExtractor& data)
272 DWARFExpression::CopyOpcodeData (lldb::ModuleSP module_sp, const DataExtractor& data, lldb::offset_t data_offset, lldb::offset_t data_length)
274 const uint8_t *bytes = data.PeekData(data_offset, data_length);
277 m_module_wp = module_sp;
278 m_data.SetData(DataBufferSP(new DataBufferHeap(bytes, data_length)));
279 m_data.SetByteOrder(data.GetByteOrder());
280 m_data.SetAddressByteSize(data.GetAddressByteSize());
285 DWARFExpression::SetOpcodeData (lldb::ModuleSP module_sp, const DataExtractor& data, lldb::offset_t data_offset, lldb::offset_t data_length)
287 m_module_wp = module_sp;
288 m_data.SetData(data, data_offset, data_length);
292 DWARFExpression::DumpLocation (Stream *s, lldb::offset_t offset, lldb::offset_t length, lldb::DescriptionLevel level, ABI *abi) const
294 if (!m_data.ValidOffsetForDataOfSize(offset, length))
296 const lldb::offset_t start_offset = offset;
297 const lldb::offset_t end_offset = offset + length;
298 while (m_data.ValidOffset(offset) && offset < end_offset)
300 const lldb::offset_t op_offset = offset;
301 const uint8_t op = m_data.GetU8(&offset);
308 case lldb::eDescriptionLevelBrief:
309 if (offset > start_offset)
313 case lldb::eDescriptionLevelFull:
314 case lldb::eDescriptionLevelVerbose:
315 if (offset > start_offset)
318 if (level == lldb::eDescriptionLevelFull)
320 // Fall through for verbose and print offset and DW_OP prefix..
321 s->Printf("0x%8.8" PRIx64 ": %s", op_offset, op >= DW_OP_APPLE_uninit ? "DW_OP_APPLE_" : "DW_OP_");
327 case DW_OP_addr: *s << "DW_OP_addr(" << m_data.GetAddress(&offset) << ") "; break; // 0x03 1 address
328 case DW_OP_deref: *s << "DW_OP_deref"; break; // 0x06
329 case DW_OP_const1u: s->Printf("DW_OP_const1u(0x%2.2x) ", m_data.GetU8(&offset)); break; // 0x08 1 1-byte constant
330 case DW_OP_const1s: s->Printf("DW_OP_const1s(0x%2.2x) ", m_data.GetU8(&offset)); break; // 0x09 1 1-byte constant
331 case DW_OP_const2u: s->Printf("DW_OP_const2u(0x%4.4x) ", m_data.GetU16(&offset)); break; // 0x0a 1 2-byte constant
332 case DW_OP_const2s: s->Printf("DW_OP_const2s(0x%4.4x) ", m_data.GetU16(&offset)); break; // 0x0b 1 2-byte constant
333 case DW_OP_const4u: s->Printf("DW_OP_const4u(0x%8.8x) ", m_data.GetU32(&offset)); break; // 0x0c 1 4-byte constant
334 case DW_OP_const4s: s->Printf("DW_OP_const4s(0x%8.8x) ", m_data.GetU32(&offset)); break; // 0x0d 1 4-byte constant
335 case DW_OP_const8u: s->Printf("DW_OP_const8u(0x%16.16" PRIx64 ") ", m_data.GetU64(&offset)); break; // 0x0e 1 8-byte constant
336 case DW_OP_const8s: s->Printf("DW_OP_const8s(0x%16.16" PRIx64 ") ", m_data.GetU64(&offset)); break; // 0x0f 1 8-byte constant
337 case DW_OP_constu: s->Printf("DW_OP_constu(0x%" PRIx64 ") ", m_data.GetULEB128(&offset)); break; // 0x10 1 ULEB128 constant
338 case DW_OP_consts: s->Printf("DW_OP_consts(0x%" PRId64 ") ", m_data.GetSLEB128(&offset)); break; // 0x11 1 SLEB128 constant
339 case DW_OP_dup: s->PutCString("DW_OP_dup"); break; // 0x12
340 case DW_OP_drop: s->PutCString("DW_OP_drop"); break; // 0x13
341 case DW_OP_over: s->PutCString("DW_OP_over"); break; // 0x14
342 case DW_OP_pick: s->Printf("DW_OP_pick(0x%2.2x) ", m_data.GetU8(&offset)); break; // 0x15 1 1-byte stack index
343 case DW_OP_swap: s->PutCString("DW_OP_swap"); break; // 0x16
344 case DW_OP_rot: s->PutCString("DW_OP_rot"); break; // 0x17
345 case DW_OP_xderef: s->PutCString("DW_OP_xderef"); break; // 0x18
346 case DW_OP_abs: s->PutCString("DW_OP_abs"); break; // 0x19
347 case DW_OP_and: s->PutCString("DW_OP_and"); break; // 0x1a
348 case DW_OP_div: s->PutCString("DW_OP_div"); break; // 0x1b
349 case DW_OP_minus: s->PutCString("DW_OP_minus"); break; // 0x1c
350 case DW_OP_mod: s->PutCString("DW_OP_mod"); break; // 0x1d
351 case DW_OP_mul: s->PutCString("DW_OP_mul"); break; // 0x1e
352 case DW_OP_neg: s->PutCString("DW_OP_neg"); break; // 0x1f
353 case DW_OP_not: s->PutCString("DW_OP_not"); break; // 0x20
354 case DW_OP_or: s->PutCString("DW_OP_or"); break; // 0x21
355 case DW_OP_plus: s->PutCString("DW_OP_plus"); break; // 0x22
356 case DW_OP_plus_uconst: // 0x23 1 ULEB128 addend
357 s->Printf("DW_OP_plus_uconst(0x%" PRIx64 ") ", m_data.GetULEB128(&offset));
360 case DW_OP_shl: s->PutCString("DW_OP_shl"); break; // 0x24
361 case DW_OP_shr: s->PutCString("DW_OP_shr"); break; // 0x25
362 case DW_OP_shra: s->PutCString("DW_OP_shra"); break; // 0x26
363 case DW_OP_xor: s->PutCString("DW_OP_xor"); break; // 0x27
364 case DW_OP_skip: s->Printf("DW_OP_skip(0x%4.4x)", m_data.GetU16(&offset)); break; // 0x2f 1 signed 2-byte constant
365 case DW_OP_bra: s->Printf("DW_OP_bra(0x%4.4x)", m_data.GetU16(&offset)); break; // 0x28 1 signed 2-byte constant
366 case DW_OP_eq: s->PutCString("DW_OP_eq"); break; // 0x29
367 case DW_OP_ge: s->PutCString("DW_OP_ge"); break; // 0x2a
368 case DW_OP_gt: s->PutCString("DW_OP_gt"); break; // 0x2b
369 case DW_OP_le: s->PutCString("DW_OP_le"); break; // 0x2c
370 case DW_OP_lt: s->PutCString("DW_OP_lt"); break; // 0x2d
371 case DW_OP_ne: s->PutCString("DW_OP_ne"); break; // 0x2e
373 case DW_OP_lit0: // 0x30
374 case DW_OP_lit1: // 0x31
375 case DW_OP_lit2: // 0x32
376 case DW_OP_lit3: // 0x33
377 case DW_OP_lit4: // 0x34
378 case DW_OP_lit5: // 0x35
379 case DW_OP_lit6: // 0x36
380 case DW_OP_lit7: // 0x37
381 case DW_OP_lit8: // 0x38
382 case DW_OP_lit9: // 0x39
383 case DW_OP_lit10: // 0x3A
384 case DW_OP_lit11: // 0x3B
385 case DW_OP_lit12: // 0x3C
386 case DW_OP_lit13: // 0x3D
387 case DW_OP_lit14: // 0x3E
388 case DW_OP_lit15: // 0x3F
389 case DW_OP_lit16: // 0x40
390 case DW_OP_lit17: // 0x41
391 case DW_OP_lit18: // 0x42
392 case DW_OP_lit19: // 0x43
393 case DW_OP_lit20: // 0x44
394 case DW_OP_lit21: // 0x45
395 case DW_OP_lit22: // 0x46
396 case DW_OP_lit23: // 0x47
397 case DW_OP_lit24: // 0x48
398 case DW_OP_lit25: // 0x49
399 case DW_OP_lit26: // 0x4A
400 case DW_OP_lit27: // 0x4B
401 case DW_OP_lit28: // 0x4C
402 case DW_OP_lit29: // 0x4D
403 case DW_OP_lit30: // 0x4E
404 case DW_OP_lit31: s->Printf("DW_OP_lit%i", op - DW_OP_lit0); break; // 0x4f
406 case DW_OP_reg0: // 0x50
407 case DW_OP_reg1: // 0x51
408 case DW_OP_reg2: // 0x52
409 case DW_OP_reg3: // 0x53
410 case DW_OP_reg4: // 0x54
411 case DW_OP_reg5: // 0x55
412 case DW_OP_reg6: // 0x56
413 case DW_OP_reg7: // 0x57
414 case DW_OP_reg8: // 0x58
415 case DW_OP_reg9: // 0x59
416 case DW_OP_reg10: // 0x5A
417 case DW_OP_reg11: // 0x5B
418 case DW_OP_reg12: // 0x5C
419 case DW_OP_reg13: // 0x5D
420 case DW_OP_reg14: // 0x5E
421 case DW_OP_reg15: // 0x5F
422 case DW_OP_reg16: // 0x60
423 case DW_OP_reg17: // 0x61
424 case DW_OP_reg18: // 0x62
425 case DW_OP_reg19: // 0x63
426 case DW_OP_reg20: // 0x64
427 case DW_OP_reg21: // 0x65
428 case DW_OP_reg22: // 0x66
429 case DW_OP_reg23: // 0x67
430 case DW_OP_reg24: // 0x68
431 case DW_OP_reg25: // 0x69
432 case DW_OP_reg26: // 0x6A
433 case DW_OP_reg27: // 0x6B
434 case DW_OP_reg28: // 0x6C
435 case DW_OP_reg29: // 0x6D
436 case DW_OP_reg30: // 0x6E
437 case DW_OP_reg31: // 0x6F
439 uint32_t reg_num = op - DW_OP_reg0;
442 RegisterInfo reg_info;
443 if (abi->GetRegisterInfoByKind(m_reg_kind, reg_num, reg_info))
447 s->PutCString (reg_info.name);
450 else if (reg_info.alt_name)
452 s->PutCString (reg_info.alt_name);
457 s->Printf("DW_OP_reg%u", reg_num); break;
494 uint32_t reg_num = op - DW_OP_breg0;
495 int64_t reg_offset = m_data.GetSLEB128(&offset);
498 RegisterInfo reg_info;
499 if (abi->GetRegisterInfoByKind(m_reg_kind, reg_num, reg_info))
503 s->Printf("[%s%+" PRIi64 "]", reg_info.name, reg_offset);
506 else if (reg_info.alt_name)
508 s->Printf("[%s%+" PRIi64 "]", reg_info.alt_name, reg_offset);
513 s->Printf("DW_OP_breg%i(0x%" PRIx64 ")", reg_num, reg_offset);
517 case DW_OP_regx: // 0x90 1 ULEB128 register
519 uint32_t reg_num = m_data.GetULEB128(&offset);
522 RegisterInfo reg_info;
523 if (abi->GetRegisterInfoByKind(m_reg_kind, reg_num, reg_info))
527 s->PutCString (reg_info.name);
530 else if (reg_info.alt_name)
532 s->PutCString (reg_info.alt_name);
537 s->Printf("DW_OP_regx(%" PRIu32 ")", reg_num); break;
540 case DW_OP_fbreg: // 0x91 1 SLEB128 offset
541 s->Printf("DW_OP_fbreg(%" PRIi64 ")",m_data.GetSLEB128(&offset));
543 case DW_OP_bregx: // 0x92 2 ULEB128 register followed by SLEB128 offset
545 uint32_t reg_num = m_data.GetULEB128(&offset);
546 int64_t reg_offset = m_data.GetSLEB128(&offset);
549 RegisterInfo reg_info;
550 if (abi->GetRegisterInfoByKind(m_reg_kind, reg_num, reg_info))
554 s->Printf("[%s%+" PRIi64 "]", reg_info.name, reg_offset);
557 else if (reg_info.alt_name)
559 s->Printf("[%s%+" PRIi64 "]", reg_info.alt_name, reg_offset);
564 s->Printf("DW_OP_bregx(reg=%" PRIu32 ",offset=%" PRIi64 ")", reg_num, reg_offset);
567 case DW_OP_piece: // 0x93 1 ULEB128 size of piece addressed
568 s->Printf("DW_OP_piece(0x%" PRIx64 ")", m_data.GetULEB128(&offset));
570 case DW_OP_deref_size: // 0x94 1 1-byte size of data retrieved
571 s->Printf("DW_OP_deref_size(0x%2.2x)", m_data.GetU8(&offset));
573 case DW_OP_xderef_size: // 0x95 1 1-byte size of data retrieved
574 s->Printf("DW_OP_xderef_size(0x%2.2x)", m_data.GetU8(&offset));
576 case DW_OP_nop: s->PutCString("DW_OP_nop"); break; // 0x96
577 case DW_OP_push_object_address: s->PutCString("DW_OP_push_object_address"); break; // 0x97 DWARF3
578 case DW_OP_call2: // 0x98 DWARF3 1 2-byte offset of DIE
579 s->Printf("DW_OP_call2(0x%4.4x)", m_data.GetU16(&offset));
581 case DW_OP_call4: // 0x99 DWARF3 1 4-byte offset of DIE
582 s->Printf("DW_OP_call4(0x%8.8x)", m_data.GetU32(&offset));
584 case DW_OP_call_ref: // 0x9a DWARF3 1 4- or 8-byte offset of DIE
585 s->Printf("DW_OP_call_ref(0x%8.8" PRIx64 ")", m_data.GetAddress(&offset));
587 // case DW_OP_form_tls_address: s << "form_tls_address"; break; // 0x9b DWARF3
588 // case DW_OP_call_frame_cfa: s << "call_frame_cfa"; break; // 0x9c DWARF3
589 // case DW_OP_bit_piece: // 0x9d DWARF3 2
590 // s->Printf("DW_OP_bit_piece(0x%x, 0x%x)", m_data.GetULEB128(&offset), m_data.GetULEB128(&offset));
592 // case DW_OP_lo_user: s->PutCString("DW_OP_lo_user"); break; // 0xe0
593 // case DW_OP_hi_user: s->PutCString("DW_OP_hi_user"); break; // 0xff
594 // case DW_OP_APPLE_extern:
595 // s->Printf("DW_OP_APPLE_extern(%" PRIu64 ")", m_data.GetULEB128(&offset));
597 // case DW_OP_APPLE_array_ref:
598 // s->PutCString("DW_OP_APPLE_array_ref");
600 case DW_OP_GNU_push_tls_address:
601 s->PutCString("DW_OP_GNU_push_tls_address"); // 0xe0
603 case DW_OP_APPLE_uninit:
604 s->PutCString("DW_OP_APPLE_uninit"); // 0xF0
606 // case DW_OP_APPLE_assign: // 0xF1 - pops value off and assigns it to second item on stack (2nd item must have assignable context)
607 // s->PutCString("DW_OP_APPLE_assign");
609 // 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)
610 // s->PutCString("DW_OP_APPLE_address_of");
612 // 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)
613 // s->PutCString("DW_OP_APPLE_value_of");
615 // 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)
616 // s->PutCString("DW_OP_APPLE_deref_type");
618 // case DW_OP_APPLE_expr_local: // 0xF5 - ULEB128 expression local index
619 // s->Printf("DW_OP_APPLE_expr_local(%" PRIu64 ")", m_data.GetULEB128(&offset));
621 // case DW_OP_APPLE_constf: // 0xF6 - 1 byte float size, followed by constant float data
623 // uint8_t float_length = m_data.GetU8(&offset);
624 // s->Printf("DW_OP_APPLE_constf(<%u> ", float_length);
625 // m_data.Dump(s, offset, eFormatHex, float_length, 1, UINT32_MAX, DW_INVALID_ADDRESS, 0, 0);
627 // // Consume the float data
628 // m_data.GetData(&offset, float_length);
631 // case DW_OP_APPLE_scalar_cast:
632 // s->Printf("DW_OP_APPLE_scalar_cast(%s)", Scalar::GetValueTypeAsCString ((Scalar::Type)m_data.GetU8(&offset)));
634 // case DW_OP_APPLE_clang_cast:
636 // clang::Type *clang_type = (clang::Type *)m_data.GetMaxU64(&offset, sizeof(void*));
637 // s->Printf("DW_OP_APPLE_clang_cast(%p)", clang_type);
640 // case DW_OP_APPLE_clear:
641 // s->PutCString("DW_OP_APPLE_clear");
643 // case DW_OP_APPLE_error: // 0xFF - Stops expression evaluation and returns an error (no args)
644 // s->PutCString("DW_OP_APPLE_error");
651 DWARFExpression::SetLocationListSlide (addr_t slide)
653 m_loclist_slide = slide;
657 DWARFExpression::GetRegisterKind ()
663 DWARFExpression::SetRegisterKind (RegisterKind reg_kind)
665 m_reg_kind = reg_kind;
669 DWARFExpression::IsLocationList() const
671 return m_loclist_slide != LLDB_INVALID_ADDRESS;
675 DWARFExpression::GetDescription (Stream *s, lldb::DescriptionLevel level, addr_t location_list_base_addr, ABI *abi) const
677 if (IsLocationList())
679 // We have a location list
680 lldb::offset_t offset = 0;
682 addr_t curr_base_addr = location_list_base_addr;
683 while (m_data.ValidOffset(offset))
685 lldb::addr_t begin_addr_offset = m_data.GetAddress(&offset);
686 lldb::addr_t end_addr_offset = m_data.GetAddress(&offset);
687 if (begin_addr_offset < end_addr_offset)
691 VMRange addr_range(curr_base_addr + begin_addr_offset, curr_base_addr + end_addr_offset);
692 addr_range.Dump(s, 0, 8);
694 lldb::offset_t location_length = m_data.GetU16(&offset);
695 DumpLocation (s, offset, location_length, level, abi);
697 offset += location_length;
699 else if (begin_addr_offset == 0 && end_addr_offset == 0)
701 // The end of the location list is marked by both the start and end offset being zero
706 if ((m_data.GetAddressByteSize() == 4 && (begin_addr_offset == UINT32_MAX)) ||
707 (m_data.GetAddressByteSize() == 8 && (begin_addr_offset == UINT64_MAX)))
709 curr_base_addr = end_addr_offset + location_list_base_addr;
710 // We have a new base address
713 *s << "base_addr = " << end_addr_offset;
722 // We have a normal location that contains DW_OP location opcodes
723 DumpLocation (s, 0, m_data.GetByteSize(), level, abi);
728 ReadRegisterValueAsScalar
730 RegisterContext *reg_ctx,
740 error_ptr->SetErrorStringWithFormat("No register context in frame.\n");
744 uint32_t native_reg = reg_ctx->ConvertRegisterKindToRegisterNumber(reg_kind, reg_num);
745 if (native_reg == LLDB_INVALID_REGNUM)
748 error_ptr->SetErrorStringWithFormat("Unable to convert register kind=%u reg_num=%u to a native register number.\n", reg_kind, reg_num);
752 const RegisterInfo *reg_info = reg_ctx->GetRegisterInfoAtIndex(native_reg);
753 RegisterValue reg_value;
754 if (reg_ctx->ReadRegister (reg_info, reg_value))
756 if (reg_value.GetScalarValue(value.GetScalar()))
758 value.SetValueType (Value::eValueTypeScalar);
759 value.SetContext (Value::eContextTypeRegisterInfo,
760 const_cast<RegisterInfo *>(reg_info));
767 // If we get this error, then we need to implement a value
768 // buffer in the dwarf expression evaluation function...
770 error_ptr->SetErrorStringWithFormat ("register %s can't be converted to a scalar value",
777 error_ptr->SetErrorStringWithFormat("register %s is not available", reg_info->name);
785 //DWARFExpression::LocationListContainsLoadAddress (Process* process, const Address &addr) const
787 // return LocationListContainsLoadAddress(process, addr.GetLoadAddress(process));
791 //DWARFExpression::LocationListContainsLoadAddress (Process* process, addr_t load_addr) const
793 // if (load_addr == LLDB_INVALID_ADDRESS)
796 // if (IsLocationList())
798 // lldb::offset_t offset = 0;
800 // addr_t loc_list_base_addr = m_loclist_slide.GetLoadAddress(process);
802 // if (loc_list_base_addr == LLDB_INVALID_ADDRESS)
805 // while (m_data.ValidOffset(offset))
807 // // We need to figure out what the value is for the location.
808 // addr_t lo_pc = m_data.GetAddress(&offset);
809 // addr_t hi_pc = m_data.GetAddress(&offset);
810 // if (lo_pc == 0 && hi_pc == 0)
814 // lo_pc += loc_list_base_addr;
815 // hi_pc += loc_list_base_addr;
817 // if (lo_pc <= load_addr && load_addr < hi_pc)
820 // offset += m_data.GetU16(&offset);
828 GetOpcodeDataSize (const DataExtractor &data, const lldb::offset_t data_offset, const uint8_t op)
830 lldb::offset_t offset = data_offset;
834 case DW_OP_call_ref: // 0x9a 1 address sized offset of DIE (DWARF3)
835 return data.GetAddressByteSize();
837 // Opcodes with no arguments
838 case DW_OP_deref: // 0x06
839 case DW_OP_dup: // 0x12
840 case DW_OP_drop: // 0x13
841 case DW_OP_over: // 0x14
842 case DW_OP_swap: // 0x16
843 case DW_OP_rot: // 0x17
844 case DW_OP_xderef: // 0x18
845 case DW_OP_abs: // 0x19
846 case DW_OP_and: // 0x1a
847 case DW_OP_div: // 0x1b
848 case DW_OP_minus: // 0x1c
849 case DW_OP_mod: // 0x1d
850 case DW_OP_mul: // 0x1e
851 case DW_OP_neg: // 0x1f
852 case DW_OP_not: // 0x20
853 case DW_OP_or: // 0x21
854 case DW_OP_plus: // 0x22
855 case DW_OP_shl: // 0x24
856 case DW_OP_shr: // 0x25
857 case DW_OP_shra: // 0x26
858 case DW_OP_xor: // 0x27
859 case DW_OP_eq: // 0x29
860 case DW_OP_ge: // 0x2a
861 case DW_OP_gt: // 0x2b
862 case DW_OP_le: // 0x2c
863 case DW_OP_lt: // 0x2d
864 case DW_OP_ne: // 0x2e
865 case DW_OP_lit0: // 0x30
866 case DW_OP_lit1: // 0x31
867 case DW_OP_lit2: // 0x32
868 case DW_OP_lit3: // 0x33
869 case DW_OP_lit4: // 0x34
870 case DW_OP_lit5: // 0x35
871 case DW_OP_lit6: // 0x36
872 case DW_OP_lit7: // 0x37
873 case DW_OP_lit8: // 0x38
874 case DW_OP_lit9: // 0x39
875 case DW_OP_lit10: // 0x3A
876 case DW_OP_lit11: // 0x3B
877 case DW_OP_lit12: // 0x3C
878 case DW_OP_lit13: // 0x3D
879 case DW_OP_lit14: // 0x3E
880 case DW_OP_lit15: // 0x3F
881 case DW_OP_lit16: // 0x40
882 case DW_OP_lit17: // 0x41
883 case DW_OP_lit18: // 0x42
884 case DW_OP_lit19: // 0x43
885 case DW_OP_lit20: // 0x44
886 case DW_OP_lit21: // 0x45
887 case DW_OP_lit22: // 0x46
888 case DW_OP_lit23: // 0x47
889 case DW_OP_lit24: // 0x48
890 case DW_OP_lit25: // 0x49
891 case DW_OP_lit26: // 0x4A
892 case DW_OP_lit27: // 0x4B
893 case DW_OP_lit28: // 0x4C
894 case DW_OP_lit29: // 0x4D
895 case DW_OP_lit30: // 0x4E
896 case DW_OP_lit31: // 0x4f
897 case DW_OP_reg0: // 0x50
898 case DW_OP_reg1: // 0x51
899 case DW_OP_reg2: // 0x52
900 case DW_OP_reg3: // 0x53
901 case DW_OP_reg4: // 0x54
902 case DW_OP_reg5: // 0x55
903 case DW_OP_reg6: // 0x56
904 case DW_OP_reg7: // 0x57
905 case DW_OP_reg8: // 0x58
906 case DW_OP_reg9: // 0x59
907 case DW_OP_reg10: // 0x5A
908 case DW_OP_reg11: // 0x5B
909 case DW_OP_reg12: // 0x5C
910 case DW_OP_reg13: // 0x5D
911 case DW_OP_reg14: // 0x5E
912 case DW_OP_reg15: // 0x5F
913 case DW_OP_reg16: // 0x60
914 case DW_OP_reg17: // 0x61
915 case DW_OP_reg18: // 0x62
916 case DW_OP_reg19: // 0x63
917 case DW_OP_reg20: // 0x64
918 case DW_OP_reg21: // 0x65
919 case DW_OP_reg22: // 0x66
920 case DW_OP_reg23: // 0x67
921 case DW_OP_reg24: // 0x68
922 case DW_OP_reg25: // 0x69
923 case DW_OP_reg26: // 0x6A
924 case DW_OP_reg27: // 0x6B
925 case DW_OP_reg28: // 0x6C
926 case DW_OP_reg29: // 0x6D
927 case DW_OP_reg30: // 0x6E
928 case DW_OP_reg31: // 0x6F
929 case DW_OP_nop: // 0x96
930 case DW_OP_push_object_address: // 0x97 DWARF3
931 case DW_OP_form_tls_address: // 0x9b DWARF3
932 case DW_OP_call_frame_cfa: // 0x9c DWARF3
933 case DW_OP_stack_value: // 0x9f DWARF4
934 case DW_OP_GNU_push_tls_address: // 0xe0 GNU extension
937 // Opcodes with a single 1 byte arguments
938 case DW_OP_const1u: // 0x08 1 1-byte constant
939 case DW_OP_const1s: // 0x09 1 1-byte constant
940 case DW_OP_pick: // 0x15 1 1-byte stack index
941 case DW_OP_deref_size: // 0x94 1 1-byte size of data retrieved
942 case DW_OP_xderef_size: // 0x95 1 1-byte size of data retrieved
945 // Opcodes with a single 2 byte arguments
946 case DW_OP_const2u: // 0x0a 1 2-byte constant
947 case DW_OP_const2s: // 0x0b 1 2-byte constant
948 case DW_OP_skip: // 0x2f 1 signed 2-byte constant
949 case DW_OP_bra: // 0x28 1 signed 2-byte constant
950 case DW_OP_call2: // 0x98 1 2-byte offset of DIE (DWARF3)
953 // Opcodes with a single 4 byte arguments
954 case DW_OP_const4u: // 0x0c 1 4-byte constant
955 case DW_OP_const4s: // 0x0d 1 4-byte constant
956 case DW_OP_call4: // 0x99 1 4-byte offset of DIE (DWARF3)
959 // Opcodes with a single 8 byte arguments
960 case DW_OP_const8u: // 0x0e 1 8-byte constant
961 case DW_OP_const8s: // 0x0f 1 8-byte constant
964 // All opcodes that have a single ULEB (signed or unsigned) argument
965 case DW_OP_constu: // 0x10 1 ULEB128 constant
966 case DW_OP_consts: // 0x11 1 SLEB128 constant
967 case DW_OP_plus_uconst: // 0x23 1 ULEB128 addend
968 case DW_OP_breg0: // 0x70 1 ULEB128 register
969 case DW_OP_breg1: // 0x71 1 ULEB128 register
970 case DW_OP_breg2: // 0x72 1 ULEB128 register
971 case DW_OP_breg3: // 0x73 1 ULEB128 register
972 case DW_OP_breg4: // 0x74 1 ULEB128 register
973 case DW_OP_breg5: // 0x75 1 ULEB128 register
974 case DW_OP_breg6: // 0x76 1 ULEB128 register
975 case DW_OP_breg7: // 0x77 1 ULEB128 register
976 case DW_OP_breg8: // 0x78 1 ULEB128 register
977 case DW_OP_breg9: // 0x79 1 ULEB128 register
978 case DW_OP_breg10: // 0x7a 1 ULEB128 register
979 case DW_OP_breg11: // 0x7b 1 ULEB128 register
980 case DW_OP_breg12: // 0x7c 1 ULEB128 register
981 case DW_OP_breg13: // 0x7d 1 ULEB128 register
982 case DW_OP_breg14: // 0x7e 1 ULEB128 register
983 case DW_OP_breg15: // 0x7f 1 ULEB128 register
984 case DW_OP_breg16: // 0x80 1 ULEB128 register
985 case DW_OP_breg17: // 0x81 1 ULEB128 register
986 case DW_OP_breg18: // 0x82 1 ULEB128 register
987 case DW_OP_breg19: // 0x83 1 ULEB128 register
988 case DW_OP_breg20: // 0x84 1 ULEB128 register
989 case DW_OP_breg21: // 0x85 1 ULEB128 register
990 case DW_OP_breg22: // 0x86 1 ULEB128 register
991 case DW_OP_breg23: // 0x87 1 ULEB128 register
992 case DW_OP_breg24: // 0x88 1 ULEB128 register
993 case DW_OP_breg25: // 0x89 1 ULEB128 register
994 case DW_OP_breg26: // 0x8a 1 ULEB128 register
995 case DW_OP_breg27: // 0x8b 1 ULEB128 register
996 case DW_OP_breg28: // 0x8c 1 ULEB128 register
997 case DW_OP_breg29: // 0x8d 1 ULEB128 register
998 case DW_OP_breg30: // 0x8e 1 ULEB128 register
999 case DW_OP_breg31: // 0x8f 1 ULEB128 register
1000 case DW_OP_regx: // 0x90 1 ULEB128 register
1001 case DW_OP_fbreg: // 0x91 1 SLEB128 offset
1002 case DW_OP_piece: // 0x93 1 ULEB128 size of piece addressed
1003 data.Skip_LEB128(&offset);
1004 return offset - data_offset;
1006 // All opcodes that have a 2 ULEB (signed or unsigned) arguments
1007 case DW_OP_bregx: // 0x92 2 ULEB128 register followed by SLEB128 offset
1008 case DW_OP_bit_piece: // 0x9d ULEB128 bit size, ULEB128 bit offset (DWARF3);
1009 data.Skip_LEB128(&offset);
1010 data.Skip_LEB128(&offset);
1011 return offset - data_offset;
1013 case DW_OP_implicit_value: // 0x9e ULEB128 size followed by block of that size (DWARF4)
1015 uint64_t block_len = data.Skip_LEB128(&offset);
1016 offset += block_len;
1017 return offset - data_offset;
1023 return LLDB_INVALID_OFFSET;
1027 DWARFExpression::GetLocation_DW_OP_addr (uint32_t op_addr_idx, bool &error) const
1030 if (IsLocationList())
1031 return LLDB_INVALID_ADDRESS;
1032 lldb::offset_t offset = 0;
1033 uint32_t curr_op_addr_idx = 0;
1034 while (m_data.ValidOffset(offset))
1036 const uint8_t op = m_data.GetU8(&offset);
1038 if (op == DW_OP_addr)
1040 const lldb::addr_t op_file_addr = m_data.GetAddress(&offset);
1041 if (curr_op_addr_idx == op_addr_idx)
1042 return op_file_addr;
1048 const offset_t op_arg_size = GetOpcodeDataSize (m_data, offset, op);
1049 if (op_arg_size == LLDB_INVALID_OFFSET)
1054 offset += op_arg_size;
1057 return LLDB_INVALID_ADDRESS;
1061 DWARFExpression::Update_DW_OP_addr (lldb::addr_t file_addr)
1063 if (IsLocationList())
1065 lldb::offset_t offset = 0;
1066 while (m_data.ValidOffset(offset))
1068 const uint8_t op = m_data.GetU8(&offset);
1070 if (op == DW_OP_addr)
1072 const uint32_t addr_byte_size = m_data.GetAddressByteSize();
1073 // We have to make a copy of the data as we don't know if this
1074 // data is from a read only memory mapped buffer, so we duplicate
1075 // all of the data first, then modify it, and if all goes well,
1076 // we then replace the data for this expression
1078 // So first we copy the data into a heap buffer
1079 std::unique_ptr<DataBufferHeap> head_data_ap (new DataBufferHeap (m_data.GetDataStart(),
1080 m_data.GetByteSize()));
1082 // Make en encoder so we can write the address into the buffer using
1083 // the correct byte order (endianness)
1084 DataEncoder encoder (head_data_ap->GetBytes(),
1085 head_data_ap->GetByteSize(),
1086 m_data.GetByteOrder(),
1089 // Replace the address in the new buffer
1090 if (encoder.PutMaxU64 (offset, addr_byte_size, file_addr) == UINT32_MAX)
1093 // All went well, so now we can reset the data using a shared
1094 // pointer to the heap data so "m_data" will now correctly
1095 // manage the heap data.
1096 m_data.SetData (DataBufferSP (head_data_ap.release()));
1101 const offset_t op_arg_size = GetOpcodeDataSize (m_data, offset, op);
1102 if (op_arg_size == LLDB_INVALID_OFFSET)
1104 offset += op_arg_size;
1111 DWARFExpression::LocationListContainsAddress (lldb::addr_t loclist_base_addr, lldb::addr_t addr) const
1113 if (addr == LLDB_INVALID_ADDRESS)
1116 if (IsLocationList())
1118 lldb::offset_t offset = 0;
1120 if (loclist_base_addr == LLDB_INVALID_ADDRESS)
1123 while (m_data.ValidOffset(offset))
1125 // We need to figure out what the value is for the location.
1126 addr_t lo_pc = m_data.GetAddress(&offset);
1127 addr_t hi_pc = m_data.GetAddress(&offset);
1128 if (lo_pc == 0 && hi_pc == 0)
1132 lo_pc += loclist_base_addr - m_loclist_slide;
1133 hi_pc += loclist_base_addr - m_loclist_slide;
1135 if (lo_pc <= addr && addr < hi_pc)
1138 offset += m_data.GetU16(&offset);
1146 DWARFExpression::GetLocation (addr_t base_addr, addr_t pc, lldb::offset_t &offset, lldb::offset_t &length)
1149 if (!IsLocationList())
1151 length = m_data.GetByteSize();
1155 if (base_addr != LLDB_INVALID_ADDRESS && pc != LLDB_INVALID_ADDRESS)
1157 addr_t curr_base_addr = base_addr;
1159 while (m_data.ValidOffset(offset))
1161 // We need to figure out what the value is for the location.
1162 addr_t lo_pc = m_data.GetAddress(&offset);
1163 addr_t hi_pc = m_data.GetAddress(&offset);
1164 if (lo_pc == 0 && hi_pc == 0)
1170 lo_pc += curr_base_addr - m_loclist_slide;
1171 hi_pc += curr_base_addr - m_loclist_slide;
1173 length = m_data.GetU16(&offset);
1175 if (length > 0 && lo_pc <= pc && pc < hi_pc)
1182 offset = LLDB_INVALID_OFFSET;
1188 DWARFExpression::DumpLocationForAddress (Stream *s,
1189 lldb::DescriptionLevel level,
1194 lldb::offset_t offset = 0;
1195 lldb::offset_t length = 0;
1197 if (GetLocation (base_addr, address, offset, length))
1201 DumpLocation(s, offset, length, level, abi);
1209 DWARFExpression::Evaluate
1211 ExecutionContextScope *exe_scope,
1212 ClangExpressionVariableList *expr_locals,
1213 ClangExpressionDeclMap *decl_map,
1214 lldb::addr_t loclist_base_load_addr,
1215 const Value* initial_value_ptr,
1220 ExecutionContext exe_ctx (exe_scope);
1221 return Evaluate(&exe_ctx, expr_locals, decl_map, NULL, loclist_base_load_addr, initial_value_ptr, result, error_ptr);
1225 DWARFExpression::Evaluate
1227 ExecutionContext *exe_ctx,
1228 ClangExpressionVariableList *expr_locals,
1229 ClangExpressionDeclMap *decl_map,
1230 RegisterContext *reg_ctx,
1231 lldb::addr_t loclist_base_load_addr,
1232 const Value* initial_value_ptr,
1237 ModuleSP module_sp = m_module_wp.lock();
1239 if (IsLocationList())
1241 lldb::offset_t offset = 0;
1243 StackFrame *frame = NULL;
1245 pc = reg_ctx->GetPC();
1248 frame = exe_ctx->GetFramePtr();
1251 RegisterContextSP reg_ctx_sp = frame->GetRegisterContext();
1254 pc = reg_ctx_sp->GetPC();
1257 if (loclist_base_load_addr != LLDB_INVALID_ADDRESS)
1259 if (pc == LLDB_INVALID_ADDRESS)
1262 error_ptr->SetErrorString("Invalid PC in frame.");
1266 addr_t curr_loclist_base_load_addr = loclist_base_load_addr;
1268 while (m_data.ValidOffset(offset))
1270 // We need to figure out what the value is for the location.
1271 addr_t lo_pc = m_data.GetAddress(&offset);
1272 addr_t hi_pc = m_data.GetAddress(&offset);
1273 if (lo_pc == 0 && hi_pc == 0)
1279 lo_pc += curr_loclist_base_load_addr - m_loclist_slide;
1280 hi_pc += curr_loclist_base_load_addr - m_loclist_slide;
1282 uint16_t length = m_data.GetU16(&offset);
1284 if (length > 0 && lo_pc <= pc && pc < hi_pc)
1286 return DWARFExpression::Evaluate (exe_ctx, expr_locals, decl_map, reg_ctx, module_sp, m_data, offset, length, m_reg_kind, initial_value_ptr, result, error_ptr);
1293 error_ptr->SetErrorString ("variable not available");
1297 // Not a location list, just a single expression.
1298 return DWARFExpression::Evaluate (exe_ctx, expr_locals, decl_map, reg_ctx, module_sp, m_data, 0, m_data.GetByteSize(), m_reg_kind, initial_value_ptr, result, error_ptr);
1304 DWARFExpression::Evaluate
1306 ExecutionContext *exe_ctx,
1307 ClangExpressionVariableList *expr_locals,
1308 ClangExpressionDeclMap *decl_map,
1309 RegisterContext *reg_ctx,
1310 lldb::ModuleSP opcode_ctx,
1311 const DataExtractor& opcodes,
1312 const lldb::offset_t opcodes_offset,
1313 const lldb::offset_t opcodes_length,
1314 const uint32_t reg_kind,
1315 const Value* initial_value_ptr,
1321 if (opcodes_length == 0)
1324 error_ptr->SetErrorString ("no location, value may have been optimized out");
1327 std::vector<Value> stack;
1329 Process *process = NULL;
1330 StackFrame *frame = NULL;
1334 process = exe_ctx->GetProcessPtr();
1335 frame = exe_ctx->GetFramePtr();
1337 if (reg_ctx == NULL && frame)
1338 reg_ctx = frame->GetRegisterContext().get();
1340 if (initial_value_ptr)
1341 stack.push_back(*initial_value_ptr);
1343 lldb::offset_t offset = opcodes_offset;
1344 const lldb::offset_t end_offset = opcodes_offset + opcodes_length;
1348 // Make sure all of the data is available in opcodes.
1349 if (!opcodes.ValidOffsetForDataOfSize(opcodes_offset, opcodes_length))
1352 error_ptr->SetErrorString ("invalid offset and/or length for opcodes buffer.");
1355 Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1358 while (opcodes.ValidOffset(offset) && offset < end_offset)
1360 const lldb::offset_t op_offset = offset;
1361 const uint8_t op = opcodes.GetU8(&offset);
1363 if (log && log->GetVerbose())
1365 size_t count = stack.size();
1366 log->Printf("Stack before operation has %zu values:", count);
1367 for (size_t i=0; i<count; ++i)
1369 StreamString new_value;
1370 new_value.Printf("[%" PRIu64 "]", (uint64_t)i);
1371 stack[i].Dump(&new_value);
1372 log->Printf(" %s", new_value.GetData());
1374 log->Printf("0x%8.8" PRIx64 ": %s", op_offset, DW_OP_value_to_name(op));
1378 //----------------------------------------------------------------------
1379 // The DW_OP_addr operation has a single operand that encodes a machine
1380 // address and whose size is the size of an address on the target machine.
1381 //----------------------------------------------------------------------
1383 stack.push_back(Scalar(opcodes.GetAddress(&offset)));
1384 stack.back().SetValueType (Value::eValueTypeFileAddress);
1387 //----------------------------------------------------------------------
1388 // The DW_OP_addr_sect_offset4 is used for any location expressions in
1389 // shared libraries that have a location like:
1390 // DW_OP_addr(0x1000)
1391 // If this address resides in a shared library, then this virtual
1392 // address won't make sense when it is evaluated in the context of a
1393 // running process where shared libraries have been slid. To account for
1394 // this, this new address type where we can store the section pointer
1395 // and a 4 byte offset.
1396 //----------------------------------------------------------------------
1397 // case DW_OP_addr_sect_offset4:
1399 // result_type = eResultTypeFileAddress;
1400 // lldb::Section *sect = (lldb::Section *)opcodes.GetMaxU64(&offset, sizeof(void *));
1401 // lldb::addr_t sect_offset = opcodes.GetU32(&offset);
1403 // Address so_addr (sect, sect_offset);
1404 // lldb::addr_t load_addr = so_addr.GetLoadAddress();
1405 // if (load_addr != LLDB_INVALID_ADDRESS)
1407 // // We successfully resolve a file address to a load
1409 // stack.push_back(load_addr);
1416 // error_ptr->SetErrorStringWithFormat ("Section %s in %s is not currently loaded.\n", sect->GetName().AsCString(), sect->GetModule()->GetFileSpec().GetFilename().AsCString());
1422 //----------------------------------------------------------------------
1423 // OPCODE: DW_OP_deref
1425 // DESCRIPTION: Pops the top stack entry and treats it as an address.
1426 // The value retrieved from that address is pushed. The size of the
1427 // data retrieved from the dereferenced address is the size of an
1428 // address on the target machine.
1429 //----------------------------------------------------------------------
1435 error_ptr->SetErrorString("Expression stack empty for DW_OP_deref.");
1438 Value::ValueType value_type = stack.back().GetValueType();
1441 case Value::eValueTypeHostAddress:
1443 void *src = (void *)stack.back().GetScalar().ULongLong();
1445 ::memcpy (&ptr, src, sizeof(void *));
1446 stack.back().GetScalar() = ptr;
1447 stack.back().ClearContext();
1450 case Value::eValueTypeLoadAddress:
1455 lldb::addr_t pointer_addr = stack.back().GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
1456 uint8_t addr_bytes[sizeof(lldb::addr_t)];
1457 uint32_t addr_size = process->GetAddressByteSize();
1459 if (process->ReadMemory(pointer_addr, &addr_bytes, addr_size, error) == addr_size)
1461 DataExtractor addr_data(addr_bytes, sizeof(addr_bytes), process->GetByteOrder(), addr_size);
1462 lldb::offset_t addr_data_offset = 0;
1463 stack.back().GetScalar() = addr_data.GetPointer(&addr_data_offset);
1464 stack.back().ClearContext();
1469 error_ptr->SetErrorStringWithFormat ("Failed to dereference pointer from 0x%" PRIx64 " for DW_OP_deref: %s\n",
1478 error_ptr->SetErrorStringWithFormat ("NULL process for DW_OP_deref.\n");
1485 error_ptr->SetErrorStringWithFormat ("NULL execution context for DW_OP_deref.\n");
1497 //----------------------------------------------------------------------
1498 // OPCODE: DW_OP_deref_size
1500 // 1 - uint8_t that specifies the size of the data to dereference.
1501 // DESCRIPTION: Behaves like the DW_OP_deref operation: it pops the top
1502 // stack entry and treats it as an address. The value retrieved from that
1503 // address is pushed. In the DW_OP_deref_size operation, however, the
1504 // size in bytes of the data retrieved from the dereferenced address is
1505 // specified by the single operand. This operand is a 1-byte unsigned
1506 // integral constant whose value may not be larger than the size of an
1507 // address on the target machine. The data retrieved is zero extended
1508 // to the size of an address on the target machine before being pushed
1509 // on the expression stack.
1510 //----------------------------------------------------------------------
1511 case DW_OP_deref_size:
1516 error_ptr->SetErrorString("Expression stack empty for DW_OP_deref_size.");
1519 uint8_t size = opcodes.GetU8(&offset);
1520 Value::ValueType value_type = stack.back().GetValueType();
1523 case Value::eValueTypeHostAddress:
1525 void *src = (void *)stack.back().GetScalar().ULongLong();
1527 ::memcpy (&ptr, src, sizeof(void *));
1528 // I can't decide whether the size operand should apply to the bytes in their
1529 // lldb-host endianness or the target endianness.. I doubt this'll ever come up
1530 // but I'll opt for assuming big endian regardless.
1533 case 1: ptr = ptr & 0xff; break;
1534 case 2: ptr = ptr & 0xffff; break;
1535 case 3: ptr = ptr & 0xffffff; break;
1536 case 4: ptr = ptr & 0xffffffff; break;
1537 // the casts are added to work around the case where intptr_t is a 32 bit quantity;
1538 // presumably we won't hit the 5..7 cases if (void*) is 32-bits in this program.
1539 case 5: ptr = (intptr_t) ptr & 0xffffffffffULL; break;
1540 case 6: ptr = (intptr_t) ptr & 0xffffffffffffULL; break;
1541 case 7: ptr = (intptr_t) ptr & 0xffffffffffffffULL; break;
1544 stack.back().GetScalar() = ptr;
1545 stack.back().ClearContext();
1548 case Value::eValueTypeLoadAddress:
1553 lldb::addr_t pointer_addr = stack.back().GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
1554 uint8_t addr_bytes[sizeof(lldb::addr_t)];
1556 if (process->ReadMemory(pointer_addr, &addr_bytes, size, error) == size)
1558 DataExtractor addr_data(addr_bytes, sizeof(addr_bytes), process->GetByteOrder(), size);
1559 lldb::offset_t addr_data_offset = 0;
1562 case 1: stack.back().GetScalar() = addr_data.GetU8(&addr_data_offset); break;
1563 case 2: stack.back().GetScalar() = addr_data.GetU16(&addr_data_offset); break;
1564 case 4: stack.back().GetScalar() = addr_data.GetU32(&addr_data_offset); break;
1565 case 8: stack.back().GetScalar() = addr_data.GetU64(&addr_data_offset); break;
1566 default: stack.back().GetScalar() = addr_data.GetPointer(&addr_data_offset);
1568 stack.back().ClearContext();
1573 error_ptr->SetErrorStringWithFormat ("Failed to dereference pointer from 0x%" PRIx64 " for DW_OP_deref: %s\n",
1582 error_ptr->SetErrorStringWithFormat ("NULL process for DW_OP_deref.\n");
1589 error_ptr->SetErrorStringWithFormat ("NULL execution context for DW_OP_deref.\n");
1601 //----------------------------------------------------------------------
1602 // OPCODE: DW_OP_xderef_size
1604 // 1 - uint8_t that specifies the size of the data to dereference.
1605 // DESCRIPTION: Behaves like the DW_OP_xderef operation: the entry at
1606 // the top of the stack is treated as an address. The second stack
1607 // entry is treated as an "address space identifier" for those
1608 // architectures that support multiple address spaces. The top two
1609 // stack elements are popped, a data item is retrieved through an
1610 // implementation-defined address calculation and pushed as the new
1611 // stack top. In the DW_OP_xderef_size operation, however, the size in
1612 // bytes of the data retrieved from the dereferenced address is
1613 // specified by the single operand. This operand is a 1-byte unsigned
1614 // integral constant whose value may not be larger than the size of an
1615 // address on the target machine. The data retrieved is zero extended
1616 // to the size of an address on the target machine before being pushed
1617 // on the expression stack.
1618 //----------------------------------------------------------------------
1619 case DW_OP_xderef_size:
1621 error_ptr->SetErrorString("Unimplemented opcode: DW_OP_xderef_size.");
1623 //----------------------------------------------------------------------
1624 // OPCODE: DW_OP_xderef
1626 // DESCRIPTION: Provides an extended dereference mechanism. The entry at
1627 // the top of the stack is treated as an address. The second stack entry
1628 // is treated as an "address space identifier" for those architectures
1629 // that support multiple address spaces. The top two stack elements are
1630 // popped, a data item is retrieved through an implementation-defined
1631 // address calculation and pushed as the new stack top. The size of the
1632 // data retrieved from the dereferenced address is the size of an address
1633 // on the target machine.
1634 //----------------------------------------------------------------------
1637 error_ptr->SetErrorString("Unimplemented opcode: DW_OP_xderef.");
1640 //----------------------------------------------------------------------
1641 // All DW_OP_constXXX opcodes have a single operand as noted below:
1644 // --------------- ----------------------------------------------------
1645 // DW_OP_const1u 1-byte unsigned integer constant
1646 // DW_OP_const1s 1-byte signed integer constant
1647 // DW_OP_const2u 2-byte unsigned integer constant
1648 // DW_OP_const2s 2-byte signed integer constant
1649 // DW_OP_const4u 4-byte unsigned integer constant
1650 // DW_OP_const4s 4-byte signed integer constant
1651 // DW_OP_const8u 8-byte unsigned integer constant
1652 // DW_OP_const8s 8-byte signed integer constant
1653 // DW_OP_constu unsigned LEB128 integer constant
1654 // DW_OP_consts signed LEB128 integer constant
1655 //----------------------------------------------------------------------
1656 case DW_OP_const1u : stack.push_back(Scalar(( uint8_t)opcodes.GetU8 (&offset))); break;
1657 case DW_OP_const1s : stack.push_back(Scalar(( int8_t)opcodes.GetU8 (&offset))); break;
1658 case DW_OP_const2u : stack.push_back(Scalar((uint16_t)opcodes.GetU16 (&offset))); break;
1659 case DW_OP_const2s : stack.push_back(Scalar(( int16_t)opcodes.GetU16 (&offset))); break;
1660 case DW_OP_const4u : stack.push_back(Scalar((uint32_t)opcodes.GetU32 (&offset))); break;
1661 case DW_OP_const4s : stack.push_back(Scalar(( int32_t)opcodes.GetU32 (&offset))); break;
1662 case DW_OP_const8u : stack.push_back(Scalar((uint64_t)opcodes.GetU64 (&offset))); break;
1663 case DW_OP_const8s : stack.push_back(Scalar(( int64_t)opcodes.GetU64 (&offset))); break;
1664 case DW_OP_constu : stack.push_back(Scalar(opcodes.GetULEB128 (&offset))); break;
1665 case DW_OP_consts : stack.push_back(Scalar(opcodes.GetSLEB128 (&offset))); break;
1667 //----------------------------------------------------------------------
1668 // OPCODE: DW_OP_dup
1670 // DESCRIPTION: duplicates the value at the top of the stack
1671 //----------------------------------------------------------------------
1676 error_ptr->SetErrorString("Expression stack empty for DW_OP_dup.");
1680 stack.push_back(stack.back());
1683 //----------------------------------------------------------------------
1684 // OPCODE: DW_OP_drop
1686 // DESCRIPTION: pops the value at the top of the stack
1687 //----------------------------------------------------------------------
1692 error_ptr->SetErrorString("Expression stack empty for DW_OP_drop.");
1699 //----------------------------------------------------------------------
1700 // OPCODE: DW_OP_over
1702 // DESCRIPTION: Duplicates the entry currently second in the stack at
1703 // the top of the stack.
1704 //----------------------------------------------------------------------
1706 if (stack.size() < 2)
1709 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_over.");
1713 stack.push_back(stack[stack.size() - 2]);
1717 //----------------------------------------------------------------------
1718 // OPCODE: DW_OP_pick
1719 // OPERANDS: uint8_t index into the current stack
1720 // DESCRIPTION: The stack entry with the specified index (0 through 255,
1721 // inclusive) is pushed on the stack
1722 //----------------------------------------------------------------------
1725 uint8_t pick_idx = opcodes.GetU8(&offset);
1726 if (pick_idx < stack.size())
1727 stack.push_back(stack[pick_idx]);
1731 error_ptr->SetErrorStringWithFormat("Index %u out of range for DW_OP_pick.\n", pick_idx);
1737 //----------------------------------------------------------------------
1738 // OPCODE: DW_OP_swap
1740 // DESCRIPTION: swaps the top two stack entries. The entry at the top
1741 // of the stack becomes the second stack entry, and the second entry
1742 // becomes the top of the stack
1743 //----------------------------------------------------------------------
1745 if (stack.size() < 2)
1748 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_swap.");
1754 stack.back() = stack[stack.size() - 2];
1755 stack[stack.size() - 2] = tmp;
1759 //----------------------------------------------------------------------
1760 // OPCODE: DW_OP_rot
1762 // DESCRIPTION: Rotates the first three stack entries. The entry at
1763 // the top of the stack becomes the third stack entry, the second
1764 // entry becomes the top of the stack, and the third entry becomes
1765 // the second entry.
1766 //----------------------------------------------------------------------
1768 if (stack.size() < 3)
1771 error_ptr->SetErrorString("Expression stack needs at least 3 items for DW_OP_rot.");
1776 size_t last_idx = stack.size() - 1;
1777 Value old_top = stack[last_idx];
1778 stack[last_idx] = stack[last_idx - 1];
1779 stack[last_idx - 1] = stack[last_idx - 2];
1780 stack[last_idx - 2] = old_top;
1784 //----------------------------------------------------------------------
1785 // OPCODE: DW_OP_abs
1787 // DESCRIPTION: pops the top stack entry, interprets it as a signed
1788 // value and pushes its absolute value. If the absolute value can not be
1789 // represented, the result is undefined.
1790 //----------------------------------------------------------------------
1795 error_ptr->SetErrorString("Expression stack needs at least 1 item for DW_OP_abs.");
1798 else if (stack.back().ResolveValue(exe_ctx).AbsoluteValue() == false)
1801 error_ptr->SetErrorString("Failed to take the absolute value of the first stack item.");
1806 //----------------------------------------------------------------------
1807 // OPCODE: DW_OP_and
1809 // DESCRIPTION: pops the top two stack values, performs a bitwise and
1810 // operation on the two, and pushes the result.
1811 //----------------------------------------------------------------------
1813 if (stack.size() < 2)
1816 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_and.");
1823 stack.back().ResolveValue(exe_ctx) = stack.back().ResolveValue(exe_ctx) & tmp.ResolveValue(exe_ctx);
1827 //----------------------------------------------------------------------
1828 // OPCODE: DW_OP_div
1830 // DESCRIPTION: pops the top two stack values, divides the former second
1831 // entry by the former top of the stack using signed division, and
1832 // pushes the result.
1833 //----------------------------------------------------------------------
1835 if (stack.size() < 2)
1838 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_div.");
1844 if (tmp.ResolveValue(exe_ctx).IsZero())
1847 error_ptr->SetErrorString("Divide by zero.");
1853 stack.back() = stack.back().ResolveValue(exe_ctx) / tmp.ResolveValue(exe_ctx);
1854 if (!stack.back().ResolveValue(exe_ctx).IsValid())
1857 error_ptr->SetErrorString("Divide failed.");
1864 //----------------------------------------------------------------------
1865 // OPCODE: DW_OP_minus
1867 // DESCRIPTION: pops the top two stack values, subtracts the former top
1868 // of the stack from the former second entry, and pushes the result.
1869 //----------------------------------------------------------------------
1871 if (stack.size() < 2)
1874 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_minus.");
1881 stack.back().ResolveValue(exe_ctx) = stack.back().ResolveValue(exe_ctx) - tmp.ResolveValue(exe_ctx);
1885 //----------------------------------------------------------------------
1886 // OPCODE: DW_OP_mod
1888 // DESCRIPTION: pops the top two stack values and pushes the result of
1889 // the calculation: former second stack entry modulo the former top of
1891 //----------------------------------------------------------------------
1893 if (stack.size() < 2)
1896 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_mod.");
1903 stack.back().ResolveValue(exe_ctx) = stack.back().ResolveValue(exe_ctx) % tmp.ResolveValue(exe_ctx);
1908 //----------------------------------------------------------------------
1909 // OPCODE: DW_OP_mul
1911 // DESCRIPTION: pops the top two stack entries, multiplies them
1912 // together, and pushes the result.
1913 //----------------------------------------------------------------------
1915 if (stack.size() < 2)
1918 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_mul.");
1925 stack.back().ResolveValue(exe_ctx) = stack.back().ResolveValue(exe_ctx) * tmp.ResolveValue(exe_ctx);
1929 //----------------------------------------------------------------------
1930 // OPCODE: DW_OP_neg
1932 // DESCRIPTION: pops the top stack entry, and pushes its negation.
1933 //----------------------------------------------------------------------
1938 error_ptr->SetErrorString("Expression stack needs at least 1 item for DW_OP_neg.");
1943 if (stack.back().ResolveValue(exe_ctx).UnaryNegate() == false)
1946 error_ptr->SetErrorString("Unary negate failed.");
1952 //----------------------------------------------------------------------
1953 // OPCODE: DW_OP_not
1955 // DESCRIPTION: pops the top stack entry, and pushes its bitwise
1957 //----------------------------------------------------------------------
1962 error_ptr->SetErrorString("Expression stack needs at least 1 item for DW_OP_not.");
1967 if (stack.back().ResolveValue(exe_ctx).OnesComplement() == false)
1970 error_ptr->SetErrorString("Logical NOT failed.");
1976 //----------------------------------------------------------------------
1979 // DESCRIPTION: pops the top two stack entries, performs a bitwise or
1980 // operation on the two, and pushes the result.
1981 //----------------------------------------------------------------------
1983 if (stack.size() < 2)
1986 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_or.");
1993 stack.back().ResolveValue(exe_ctx) = stack.back().ResolveValue(exe_ctx) | tmp.ResolveValue(exe_ctx);
1997 //----------------------------------------------------------------------
1998 // OPCODE: DW_OP_plus
2000 // DESCRIPTION: pops the top two stack entries, adds them together, and
2001 // pushes the result.
2002 //----------------------------------------------------------------------
2004 if (stack.size() < 2)
2007 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_plus.");
2014 stack.back().ResolveValue(exe_ctx) = stack.back().ResolveValue(exe_ctx) + tmp.ResolveValue(exe_ctx);
2018 //----------------------------------------------------------------------
2019 // OPCODE: DW_OP_plus_uconst
2021 // DESCRIPTION: pops the top stack entry, adds it to the unsigned LEB128
2022 // constant operand and pushes the result.
2023 //----------------------------------------------------------------------
2024 case DW_OP_plus_uconst:
2028 error_ptr->SetErrorString("Expression stack needs at least 1 item for DW_OP_plus_uconst.");
2033 const uint64_t uconst_value = opcodes.GetULEB128(&offset);
2034 // Implicit conversion from a UINT to a Scalar...
2035 stack.back().ResolveValue(exe_ctx) += uconst_value;
2036 if (!stack.back().ResolveValue(exe_ctx).IsValid())
2039 error_ptr->SetErrorString("DW_OP_plus_uconst failed.");
2045 //----------------------------------------------------------------------
2046 // OPCODE: DW_OP_shl
2048 // DESCRIPTION: pops the top two stack entries, shifts the former
2049 // second entry left by the number of bits specified by the former top
2050 // of the stack, and pushes the result.
2051 //----------------------------------------------------------------------
2053 if (stack.size() < 2)
2056 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_shl.");
2063 stack.back().ResolveValue(exe_ctx) <<= tmp.ResolveValue(exe_ctx);
2067 //----------------------------------------------------------------------
2068 // OPCODE: DW_OP_shr
2070 // DESCRIPTION: pops the top two stack entries, shifts the former second
2071 // entry right logically (filling with zero bits) by the number of bits
2072 // specified by the former top of the stack, and pushes the result.
2073 //----------------------------------------------------------------------
2075 if (stack.size() < 2)
2078 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_shr.");
2085 if (stack.back().ResolveValue(exe_ctx).ShiftRightLogical(tmp.ResolveValue(exe_ctx)) == false)
2088 error_ptr->SetErrorString("DW_OP_shr failed.");
2094 //----------------------------------------------------------------------
2095 // OPCODE: DW_OP_shra
2097 // DESCRIPTION: pops the top two stack entries, shifts the former second
2098 // entry right arithmetically (divide the magnitude by 2, keep the same
2099 // sign for the result) by the number of bits specified by the former
2100 // top of the stack, and pushes the result.
2101 //----------------------------------------------------------------------
2103 if (stack.size() < 2)
2106 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_shra.");
2113 stack.back().ResolveValue(exe_ctx) >>= tmp.ResolveValue(exe_ctx);
2117 //----------------------------------------------------------------------
2118 // OPCODE: DW_OP_xor
2120 // DESCRIPTION: pops the top two stack entries, performs the bitwise
2121 // exclusive-or operation on the two, and pushes the result.
2122 //----------------------------------------------------------------------
2124 if (stack.size() < 2)
2127 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_xor.");
2134 stack.back().ResolveValue(exe_ctx) = stack.back().ResolveValue(exe_ctx) ^ tmp.ResolveValue(exe_ctx);
2139 //----------------------------------------------------------------------
2140 // OPCODE: DW_OP_skip
2141 // OPERANDS: int16_t
2142 // DESCRIPTION: An unconditional branch. Its single operand is a 2-byte
2143 // signed integer constant. The 2-byte constant is the number of bytes
2144 // of the DWARF expression to skip forward or backward from the current
2145 // operation, beginning after the 2-byte constant.
2146 //----------------------------------------------------------------------
2149 int16_t skip_offset = (int16_t)opcodes.GetU16(&offset);
2150 lldb::offset_t new_offset = offset + skip_offset;
2151 if (new_offset >= opcodes_offset && new_offset < end_offset)
2152 offset = new_offset;
2156 error_ptr->SetErrorString("Invalid opcode offset in DW_OP_skip.");
2162 //----------------------------------------------------------------------
2163 // OPCODE: DW_OP_bra
2164 // OPERANDS: int16_t
2165 // DESCRIPTION: A conditional branch. Its single operand is a 2-byte
2166 // signed integer constant. This operation pops the top of stack. If
2167 // the value popped is not the constant 0, the 2-byte constant operand
2168 // is the number of bytes of the DWARF expression to skip forward or
2169 // backward from the current operation, beginning after the 2-byte
2171 //----------------------------------------------------------------------
2176 int16_t bra_offset = (int16_t)opcodes.GetU16(&offset);
2178 if (tmp.ResolveValue(exe_ctx) != zero)
2180 lldb::offset_t new_offset = offset + bra_offset;
2181 if (new_offset >= opcodes_offset && new_offset < end_offset)
2182 offset = new_offset;
2186 error_ptr->SetErrorString("Invalid opcode offset in DW_OP_bra.");
2193 //----------------------------------------------------------------------
2196 // DESCRIPTION: pops the top two stack values, compares using the
2197 // equals (==) operator.
2198 // STACK RESULT: push the constant value 1 onto the stack if the result
2199 // of the operation is true or the constant value 0 if the result of the
2200 // operation is false.
2201 //----------------------------------------------------------------------
2203 if (stack.size() < 2)
2206 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_eq.");
2213 stack.back().ResolveValue(exe_ctx) = stack.back().ResolveValue(exe_ctx) == tmp.ResolveValue(exe_ctx);
2217 //----------------------------------------------------------------------
2220 // DESCRIPTION: pops the top two stack values, compares using the
2221 // greater than or equal to (>=) operator.
2222 // STACK RESULT: push the constant value 1 onto the stack if the result
2223 // of the operation is true or the constant value 0 if the result of the
2224 // operation is false.
2225 //----------------------------------------------------------------------
2227 if (stack.size() < 2)
2230 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_ge.");
2237 stack.back().ResolveValue(exe_ctx) = stack.back().ResolveValue(exe_ctx) >= tmp.ResolveValue(exe_ctx);
2241 //----------------------------------------------------------------------
2244 // DESCRIPTION: pops the top two stack values, compares using the
2245 // greater than (>) operator.
2246 // STACK RESULT: push the constant value 1 onto the stack if the result
2247 // of the operation is true or the constant value 0 if the result of the
2248 // operation is false.
2249 //----------------------------------------------------------------------
2251 if (stack.size() < 2)
2254 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_gt.");
2261 stack.back().ResolveValue(exe_ctx) = stack.back().ResolveValue(exe_ctx) > tmp.ResolveValue(exe_ctx);
2265 //----------------------------------------------------------------------
2268 // DESCRIPTION: pops the top two stack values, compares using the
2269 // less than or equal to (<=) operator.
2270 // STACK RESULT: push the constant value 1 onto the stack if the result
2271 // of the operation is true or the constant value 0 if the result of the
2272 // operation is false.
2273 //----------------------------------------------------------------------
2275 if (stack.size() < 2)
2278 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_le.");
2285 stack.back().ResolveValue(exe_ctx) = stack.back().ResolveValue(exe_ctx) <= tmp.ResolveValue(exe_ctx);
2289 //----------------------------------------------------------------------
2292 // DESCRIPTION: pops the top two stack values, compares using the
2293 // less than (<) operator.
2294 // STACK RESULT: push the constant value 1 onto the stack if the result
2295 // of the operation is true or the constant value 0 if the result of the
2296 // operation is false.
2297 //----------------------------------------------------------------------
2299 if (stack.size() < 2)
2302 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_lt.");
2309 stack.back().ResolveValue(exe_ctx) = stack.back().ResolveValue(exe_ctx) < tmp.ResolveValue(exe_ctx);
2313 //----------------------------------------------------------------------
2316 // DESCRIPTION: pops the top two stack values, compares using the
2317 // not equal (!=) operator.
2318 // STACK RESULT: push the constant value 1 onto the stack if the result
2319 // of the operation is true or the constant value 0 if the result of the
2320 // operation is false.
2321 //----------------------------------------------------------------------
2323 if (stack.size() < 2)
2326 error_ptr->SetErrorString("Expression stack needs at least 2 items for DW_OP_ne.");
2333 stack.back().ResolveValue(exe_ctx) = stack.back().ResolveValue(exe_ctx) != tmp.ResolveValue(exe_ctx);
2337 //----------------------------------------------------------------------
2338 // OPCODE: DW_OP_litn
2340 // DESCRIPTION: encode the unsigned literal values from 0 through 31.
2341 // STACK RESULT: push the unsigned literal constant value onto the top
2343 //----------------------------------------------------------------------
2376 stack.push_back(Scalar(op - DW_OP_lit0));
2379 //----------------------------------------------------------------------
2380 // OPCODE: DW_OP_regN
2382 // DESCRIPTION: Push the value in register n on the top of the stack.
2383 //----------------------------------------------------------------------
2417 reg_num = op - DW_OP_reg0;
2419 if (ReadRegisterValueAsScalar (reg_ctx, reg_kind, reg_num, error_ptr, tmp))
2420 stack.push_back(tmp);
2425 //----------------------------------------------------------------------
2426 // OPCODE: DW_OP_regx
2428 // ULEB128 literal operand that encodes the register.
2429 // DESCRIPTION: Push the value in register on the top of the stack.
2430 //----------------------------------------------------------------------
2433 reg_num = opcodes.GetULEB128(&offset);
2434 if (ReadRegisterValueAsScalar (reg_ctx, reg_kind, reg_num, error_ptr, tmp))
2435 stack.push_back(tmp);
2441 //----------------------------------------------------------------------
2442 // OPCODE: DW_OP_bregN
2444 // SLEB128 offset from register N
2445 // DESCRIPTION: Value is in memory at the address specified by register
2446 // N plus an offset.
2447 //----------------------------------------------------------------------
2481 reg_num = op - DW_OP_breg0;
2483 if (ReadRegisterValueAsScalar (reg_ctx, reg_kind, reg_num, error_ptr, tmp))
2485 int64_t breg_offset = opcodes.GetSLEB128(&offset);
2486 tmp.ResolveValue(exe_ctx) += (uint64_t)breg_offset;
2488 stack.push_back(tmp);
2489 stack.back().SetValueType (Value::eValueTypeLoadAddress);
2495 //----------------------------------------------------------------------
2496 // OPCODE: DW_OP_bregx
2498 // ULEB128 literal operand that encodes the register.
2499 // SLEB128 offset from register N
2500 // DESCRIPTION: Value is in memory at the address specified by register
2501 // N plus an offset.
2502 //----------------------------------------------------------------------
2505 reg_num = opcodes.GetULEB128(&offset);
2507 if (ReadRegisterValueAsScalar (reg_ctx, reg_kind, reg_num, error_ptr, tmp))
2509 int64_t breg_offset = opcodes.GetSLEB128(&offset);
2510 tmp.ResolveValue(exe_ctx) += (uint64_t)breg_offset;
2512 stack.push_back(tmp);
2513 stack.back().SetValueType (Value::eValueTypeLoadAddress);
2526 if (frame->GetFrameBaseValue(value, error_ptr))
2528 int64_t fbreg_offset = opcodes.GetSLEB128(&offset);
2529 value += fbreg_offset;
2530 stack.push_back(value);
2531 stack.back().SetValueType (Value::eValueTypeLoadAddress);
2539 error_ptr->SetErrorString ("Invalid stack frame in context for DW_OP_fbreg opcode.");
2546 error_ptr->SetErrorStringWithFormat ("NULL execution context for DW_OP_fbreg.\n");
2552 //----------------------------------------------------------------------
2553 // OPCODE: DW_OP_nop
2555 // DESCRIPTION: A place holder. It has no effect on the location stack
2556 // or any of its values.
2557 //----------------------------------------------------------------------
2561 //----------------------------------------------------------------------
2562 // OPCODE: DW_OP_piece
2564 // ULEB128: byte size of the piece
2565 // DESCRIPTION: The operand describes the size in bytes of the piece of
2566 // the object referenced by the DWARF expression whose result is at the
2567 // top of the stack. If the piece is located in a register, but does not
2568 // occupy the entire register, the placement of the piece within that
2569 // register is defined by the ABI.
2571 // Many compilers store a single variable in sets of registers, or store
2572 // a variable partially in memory and partially in registers.
2573 // DW_OP_piece provides a way of describing how large a part of a
2574 // variable a particular DWARF expression refers to.
2575 //----------------------------------------------------------------------
2577 if (stack.size() < 1)
2580 error_ptr->SetErrorString("Expression stack needs at least 1 item for DW_OP_piece.");
2585 const uint64_t piece_byte_size = opcodes.GetULEB128(&offset);
2586 switch (stack.back().GetValueType())
2588 case Value::eValueTypeScalar:
2589 case Value::eValueTypeFileAddress:
2590 case Value::eValueTypeLoadAddress:
2591 case Value::eValueTypeHostAddress:
2593 uint32_t bit_size = piece_byte_size * 8;
2594 uint32_t bit_offset = 0;
2595 if (!stack.back().GetScalar().ExtractBitfield (bit_size, bit_offset))
2598 error_ptr->SetErrorStringWithFormat("unable to extract %" PRIu64 " bytes from a %" PRIu64 " byte scalar value.", piece_byte_size, (uint64_t)stack.back().GetScalar().GetByteSize());
2604 case Value::eValueTypeVector:
2606 if (stack.back().GetVector().length >= piece_byte_size)
2607 stack.back().GetVector().length = piece_byte_size;
2611 error_ptr->SetErrorStringWithFormat("unable to extract %" PRIu64 " bytes from a %" PRIu64 " byte vector value.", piece_byte_size, (uint64_t)stack.back().GetVector().length);
2620 case DW_OP_bit_piece: // 0x9d ULEB128 bit size, ULEB128 bit offset (DWARF3);
2621 if (stack.size() < 1)
2624 error_ptr->SetErrorString("Expression stack needs at least 1 item for DW_OP_bit_piece.");
2629 const uint64_t piece_bit_size = opcodes.GetULEB128(&offset);
2630 const uint64_t piece_bit_offset = opcodes.GetULEB128(&offset);
2631 switch (stack.back().GetValueType())
2633 case Value::eValueTypeScalar:
2634 case Value::eValueTypeFileAddress:
2635 case Value::eValueTypeLoadAddress:
2636 case Value::eValueTypeHostAddress:
2638 if (!stack.back().GetScalar().ExtractBitfield (piece_bit_size, piece_bit_offset))
2641 error_ptr->SetErrorStringWithFormat("unable to extract %" PRIu64 " bit value with %" PRIu64 " bit offset from a %" PRIu64 " bit scalar value.",
2644 (uint64_t)(stack.back().GetScalar().GetByteSize()*8));
2650 case Value::eValueTypeVector:
2653 error_ptr->SetErrorStringWithFormat ("unable to extract %" PRIu64 " bit value with %" PRIu64 " bit offset from a vector value.",
2662 //----------------------------------------------------------------------
2663 // OPCODE: DW_OP_push_object_address
2665 // DESCRIPTION: Pushes the address of the object currently being
2666 // evaluated as part of evaluation of a user presented expression.
2667 // This object may correspond to an independent variable described by
2668 // its own DIE or it may be a component of an array, structure, or class
2669 // whose address has been dynamically determined by an earlier step
2670 // during user expression evaluation.
2671 //----------------------------------------------------------------------
2672 case DW_OP_push_object_address:
2674 error_ptr->SetErrorString ("Unimplemented opcode DW_OP_push_object_address.");
2677 //----------------------------------------------------------------------
2678 // OPCODE: DW_OP_call2
2680 // uint16_t compile unit relative offset of a DIE
2681 // DESCRIPTION: Performs subroutine calls during evaluation
2682 // of a DWARF expression. The operand is the 2-byte unsigned offset
2683 // of a debugging information entry in the current compilation unit.
2685 // Operand interpretation is exactly like that for DW_FORM_ref2.
2687 // This operation transfers control of DWARF expression evaluation
2688 // to the DW_AT_location attribute of the referenced DIE. If there is
2689 // no such attribute, then there is no effect. Execution of the DWARF
2690 // expression of a DW_AT_location attribute may add to and/or remove from
2691 // values on the stack. Execution returns to the point following the call
2692 // when the end of the attribute is reached. Values on the stack at the
2693 // time of the call may be used as parameters by the called expression
2694 // and values left on the stack by the called expression may be used as
2695 // return values by prior agreement between the calling and called
2697 //----------------------------------------------------------------------
2700 error_ptr->SetErrorString ("Unimplemented opcode DW_OP_call2.");
2702 //----------------------------------------------------------------------
2703 // OPCODE: DW_OP_call4
2705 // uint32_t compile unit relative offset of a DIE
2706 // DESCRIPTION: Performs a subroutine call during evaluation of a DWARF
2707 // expression. For DW_OP_call4, the operand is a 4-byte unsigned offset
2708 // of a debugging information entry in the current compilation unit.
2710 // Operand interpretation DW_OP_call4 is exactly like that for
2713 // This operation transfers control of DWARF expression evaluation
2714 // to the DW_AT_location attribute of the referenced DIE. If there is
2715 // no such attribute, then there is no effect. Execution of the DWARF
2716 // expression of a DW_AT_location attribute may add to and/or remove from
2717 // values on the stack. Execution returns to the point following the call
2718 // when the end of the attribute is reached. Values on the stack at the
2719 // time of the call may be used as parameters by the called expression
2720 // and values left on the stack by the called expression may be used as
2721 // return values by prior agreement between the calling and called
2723 //----------------------------------------------------------------------
2726 error_ptr->SetErrorString ("Unimplemented opcode DW_OP_call4.");
2729 //----------------------------------------------------------------------
2730 // OPCODE: DW_OP_stack_value
2732 // DESCRIPTION: Specifies that the object does not exist in memory but
2733 // rather is a constant value. The value from the top of the stack is
2734 // the value to be used. This is the actual object value and not the
2736 //----------------------------------------------------------------------
2737 case DW_OP_stack_value:
2738 stack.back().SetValueType(Value::eValueTypeScalar);
2741 //----------------------------------------------------------------------
2742 // OPCODE: DW_OP_call_frame_cfa
2744 // DESCRIPTION: Specifies a DWARF expression that pushes the value of
2745 // the canonical frame address consistent with the call frame information
2746 // located in .debug_frame (or in the FDEs of the eh_frame section).
2747 //----------------------------------------------------------------------
2748 case DW_OP_call_frame_cfa:
2751 // Note that we don't have to parse FDEs because this DWARF expression
2752 // is commonly evaluated with a valid stack frame.
2753 StackID id = frame->GetStackID();
2754 addr_t cfa = id.GetCallFrameAddress();
2755 if (cfa != LLDB_INVALID_ADDRESS)
2757 stack.push_back(Scalar(cfa));
2758 stack.back().SetValueType (Value::eValueTypeHostAddress);
2762 error_ptr->SetErrorString ("Stack frame does not include a canonical frame address for DW_OP_call_frame_cfa opcode.");
2767 error_ptr->SetErrorString ("Invalid stack frame in context for DW_OP_call_frame_cfa opcode.");
2772 //----------------------------------------------------------------------
2773 // OPCODE: DW_OP_GNU_push_tls_address
2775 // DESCRIPTION: Pops a TLS offset from the stack, converts it to
2776 // an absolute value, and pushes it back on.
2777 //----------------------------------------------------------------------
2778 case DW_OP_GNU_push_tls_address:
2780 if (stack.size() < 1)
2783 error_ptr->SetErrorString("DW_OP_GNU_push_tls_address needs an argument.");
2787 if (!exe_ctx || !opcode_ctx)
2790 error_ptr->SetErrorString("No context to evaluate TLS within.");
2794 Thread *thread = exe_ctx->GetThreadPtr();
2798 error_ptr->SetErrorString("No thread to evaluate TLS within.");
2802 // Lookup the TLS block address for this thread and module.
2803 addr_t tls_addr = thread->GetThreadLocalData (opcode_ctx);
2805 if (tls_addr == LLDB_INVALID_ADDRESS)
2808 error_ptr->SetErrorString ("No TLS data currently exists for this thread.");
2812 // Convert the TLS offset into the absolute address.
2813 Scalar tmp = stack.back().ResolveValue(exe_ctx);
2814 stack.back() = tmp + tls_addr;
2815 stack.back().SetValueType (Value::eValueTypeLoadAddress);
2821 log->Printf("Unhandled opcode %s in DWARFExpression.", DW_OP_value_to_name(op));
2829 error_ptr->SetErrorString ("Stack empty after evaluation.");
2832 else if (log && log->GetVerbose())
2834 size_t count = stack.size();
2835 log->Printf("Stack after operation has %zu values:", count);
2836 for (size_t i=0; i<count; ++i)
2838 StreamString new_value;
2839 new_value.Printf("[%" PRIu64 "]", (uint64_t)i);
2840 stack[i].Dump(&new_value);
2841 log->Printf(" %s", new_value.GetData());
2845 result = stack.back();
2846 return true; // Return true on success