File: | build/source/lldb/source/Expression/DWARFExpression.cpp |
Warning: | line 2216, column 9 Value stored to 'dwarf4_location_description_kind' is never read |
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1 | //===-- DWARFExpression.cpp -----------------------------------------------===// |
2 | // |
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
4 | // See https://llvm.org/LICENSE.txt for license information. |
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
6 | // |
7 | //===----------------------------------------------------------------------===// |
8 | |
9 | #include "lldb/Expression/DWARFExpression.h" |
10 | |
11 | #include <cinttypes> |
12 | |
13 | #include <optional> |
14 | #include <vector> |
15 | |
16 | #include "lldb/Core/Module.h" |
17 | #include "lldb/Core/Value.h" |
18 | #include "lldb/Core/dwarf.h" |
19 | #include "lldb/Utility/DataEncoder.h" |
20 | #include "lldb/Utility/LLDBLog.h" |
21 | #include "lldb/Utility/Log.h" |
22 | #include "lldb/Utility/RegisterValue.h" |
23 | #include "lldb/Utility/Scalar.h" |
24 | #include "lldb/Utility/StreamString.h" |
25 | #include "lldb/Utility/VMRange.h" |
26 | |
27 | #include "lldb/Host/Host.h" |
28 | #include "lldb/Utility/Endian.h" |
29 | |
30 | #include "lldb/Symbol/Function.h" |
31 | |
32 | #include "lldb/Target/ABI.h" |
33 | #include "lldb/Target/ExecutionContext.h" |
34 | #include "lldb/Target/Process.h" |
35 | #include "lldb/Target/RegisterContext.h" |
36 | #include "lldb/Target/StackFrame.h" |
37 | #include "lldb/Target/StackID.h" |
38 | #include "lldb/Target/Target.h" |
39 | #include "lldb/Target/Thread.h" |
40 | #include "llvm/DebugInfo/DWARF/DWARFDebugLoc.h" |
41 | #include "llvm/DebugInfo/DWARF/DWARFExpression.h" |
42 | |
43 | #include "Plugins/SymbolFile/DWARF/DWARFUnit.h" |
44 | |
45 | using namespace lldb; |
46 | using namespace lldb_private; |
47 | using namespace lldb_private::dwarf; |
48 | |
49 | // DWARFExpression constructor |
50 | DWARFExpression::DWARFExpression() : m_data() {} |
51 | |
52 | DWARFExpression::DWARFExpression(const DataExtractor &data) : m_data(data) {} |
53 | |
54 | // Destructor |
55 | DWARFExpression::~DWARFExpression() = default; |
56 | |
57 | bool DWARFExpression::IsValid() const { return m_data.GetByteSize() > 0; } |
58 | |
59 | void DWARFExpression::UpdateValue(uint64_t const_value, |
60 | lldb::offset_t const_value_byte_size, |
61 | uint8_t addr_byte_size) { |
62 | if (!const_value_byte_size) |
63 | return; |
64 | |
65 | m_data.SetData( |
66 | DataBufferSP(new DataBufferHeap(&const_value, const_value_byte_size))); |
67 | m_data.SetByteOrder(endian::InlHostByteOrder()); |
68 | m_data.SetAddressByteSize(addr_byte_size); |
69 | } |
70 | |
71 | void DWARFExpression::DumpLocation(Stream *s, lldb::DescriptionLevel level, |
72 | ABI *abi) const { |
73 | auto *MCRegInfo = abi ? &abi->GetMCRegisterInfo() : nullptr; |
74 | auto GetRegName = [&MCRegInfo](uint64_t DwarfRegNum, |
75 | bool IsEH) -> llvm::StringRef { |
76 | if (!MCRegInfo) |
77 | return {}; |
78 | if (std::optional<unsigned> LLVMRegNum = |
79 | MCRegInfo->getLLVMRegNum(DwarfRegNum, IsEH)) |
80 | if (const char *RegName = MCRegInfo->getName(*LLVMRegNum)) |
81 | return llvm::StringRef(RegName); |
82 | return {}; |
83 | }; |
84 | llvm::DIDumpOptions DumpOpts; |
85 | DumpOpts.GetNameForDWARFReg = GetRegName; |
86 | llvm::DWARFExpression(m_data.GetAsLLVM(), m_data.GetAddressByteSize()) |
87 | .print(s->AsRawOstream(), DumpOpts, nullptr); |
88 | } |
89 | |
90 | RegisterKind DWARFExpression::GetRegisterKind() const { return m_reg_kind; } |
91 | |
92 | void DWARFExpression::SetRegisterKind(RegisterKind reg_kind) { |
93 | m_reg_kind = reg_kind; |
94 | } |
95 | |
96 | |
97 | static bool ReadRegisterValueAsScalar(RegisterContext *reg_ctx, |
98 | lldb::RegisterKind reg_kind, |
99 | uint32_t reg_num, Status *error_ptr, |
100 | Value &value) { |
101 | if (reg_ctx == nullptr) { |
102 | if (error_ptr) |
103 | error_ptr->SetErrorString("No register context in frame.\n"); |
104 | } else { |
105 | uint32_t native_reg = |
106 | reg_ctx->ConvertRegisterKindToRegisterNumber(reg_kind, reg_num); |
107 | if (native_reg == LLDB_INVALID_REGNUM(4294967295U)) { |
108 | if (error_ptr) |
109 | error_ptr->SetErrorStringWithFormat("Unable to convert register " |
110 | "kind=%u reg_num=%u to a native " |
111 | "register number.\n", |
112 | reg_kind, reg_num); |
113 | } else { |
114 | const RegisterInfo *reg_info = |
115 | reg_ctx->GetRegisterInfoAtIndex(native_reg); |
116 | RegisterValue reg_value; |
117 | if (reg_ctx->ReadRegister(reg_info, reg_value)) { |
118 | if (reg_value.GetScalarValue(value.GetScalar())) { |
119 | value.SetValueType(Value::ValueType::Scalar); |
120 | value.SetContext(Value::ContextType::RegisterInfo, |
121 | const_cast<RegisterInfo *>(reg_info)); |
122 | if (error_ptr) |
123 | error_ptr->Clear(); |
124 | return true; |
125 | } else { |
126 | // If we get this error, then we need to implement a value buffer in |
127 | // the dwarf expression evaluation function... |
128 | if (error_ptr) |
129 | error_ptr->SetErrorStringWithFormat( |
130 | "register %s can't be converted to a scalar value", |
131 | reg_info->name); |
132 | } |
133 | } else { |
134 | if (error_ptr) |
135 | error_ptr->SetErrorStringWithFormat("register %s is not available", |
136 | reg_info->name); |
137 | } |
138 | } |
139 | } |
140 | return false; |
141 | } |
142 | |
143 | /// Return the length in bytes of the set of operands for \p op. No guarantees |
144 | /// are made on the state of \p data after this call. |
145 | static offset_t GetOpcodeDataSize(const DataExtractor &data, |
146 | const lldb::offset_t data_offset, |
147 | const uint8_t op, const DWARFUnit *dwarf_cu) { |
148 | lldb::offset_t offset = data_offset; |
149 | switch (op) { |
150 | case DW_OP_addr: |
151 | case DW_OP_call_ref: // 0x9a 1 address sized offset of DIE (DWARF3) |
152 | return data.GetAddressByteSize(); |
153 | |
154 | // Opcodes with no arguments |
155 | case DW_OP_deref: // 0x06 |
156 | case DW_OP_dup: // 0x12 |
157 | case DW_OP_drop: // 0x13 |
158 | case DW_OP_over: // 0x14 |
159 | case DW_OP_swap: // 0x16 |
160 | case DW_OP_rot: // 0x17 |
161 | case DW_OP_xderef: // 0x18 |
162 | case DW_OP_abs: // 0x19 |
163 | case DW_OP_and: // 0x1a |
164 | case DW_OP_div: // 0x1b |
165 | case DW_OP_minus: // 0x1c |
166 | case DW_OP_mod: // 0x1d |
167 | case DW_OP_mul: // 0x1e |
168 | case DW_OP_neg: // 0x1f |
169 | case DW_OP_not: // 0x20 |
170 | case DW_OP_or: // 0x21 |
171 | case DW_OP_plus: // 0x22 |
172 | case DW_OP_shl: // 0x24 |
173 | case DW_OP_shr: // 0x25 |
174 | case DW_OP_shra: // 0x26 |
175 | case DW_OP_xor: // 0x27 |
176 | case DW_OP_eq: // 0x29 |
177 | case DW_OP_ge: // 0x2a |
178 | case DW_OP_gt: // 0x2b |
179 | case DW_OP_le: // 0x2c |
180 | case DW_OP_lt: // 0x2d |
181 | case DW_OP_ne: // 0x2e |
182 | case DW_OP_lit0: // 0x30 |
183 | case DW_OP_lit1: // 0x31 |
184 | case DW_OP_lit2: // 0x32 |
185 | case DW_OP_lit3: // 0x33 |
186 | case DW_OP_lit4: // 0x34 |
187 | case DW_OP_lit5: // 0x35 |
188 | case DW_OP_lit6: // 0x36 |
189 | case DW_OP_lit7: // 0x37 |
190 | case DW_OP_lit8: // 0x38 |
191 | case DW_OP_lit9: // 0x39 |
192 | case DW_OP_lit10: // 0x3A |
193 | case DW_OP_lit11: // 0x3B |
194 | case DW_OP_lit12: // 0x3C |
195 | case DW_OP_lit13: // 0x3D |
196 | case DW_OP_lit14: // 0x3E |
197 | case DW_OP_lit15: // 0x3F |
198 | case DW_OP_lit16: // 0x40 |
199 | case DW_OP_lit17: // 0x41 |
200 | case DW_OP_lit18: // 0x42 |
201 | case DW_OP_lit19: // 0x43 |
202 | case DW_OP_lit20: // 0x44 |
203 | case DW_OP_lit21: // 0x45 |
204 | case DW_OP_lit22: // 0x46 |
205 | case DW_OP_lit23: // 0x47 |
206 | case DW_OP_lit24: // 0x48 |
207 | case DW_OP_lit25: // 0x49 |
208 | case DW_OP_lit26: // 0x4A |
209 | case DW_OP_lit27: // 0x4B |
210 | case DW_OP_lit28: // 0x4C |
211 | case DW_OP_lit29: // 0x4D |
212 | case DW_OP_lit30: // 0x4E |
213 | case DW_OP_lit31: // 0x4f |
214 | case DW_OP_reg0: // 0x50 |
215 | case DW_OP_reg1: // 0x51 |
216 | case DW_OP_reg2: // 0x52 |
217 | case DW_OP_reg3: // 0x53 |
218 | case DW_OP_reg4: // 0x54 |
219 | case DW_OP_reg5: // 0x55 |
220 | case DW_OP_reg6: // 0x56 |
221 | case DW_OP_reg7: // 0x57 |
222 | case DW_OP_reg8: // 0x58 |
223 | case DW_OP_reg9: // 0x59 |
224 | case DW_OP_reg10: // 0x5A |
225 | case DW_OP_reg11: // 0x5B |
226 | case DW_OP_reg12: // 0x5C |
227 | case DW_OP_reg13: // 0x5D |
228 | case DW_OP_reg14: // 0x5E |
229 | case DW_OP_reg15: // 0x5F |
230 | case DW_OP_reg16: // 0x60 |
231 | case DW_OP_reg17: // 0x61 |
232 | case DW_OP_reg18: // 0x62 |
233 | case DW_OP_reg19: // 0x63 |
234 | case DW_OP_reg20: // 0x64 |
235 | case DW_OP_reg21: // 0x65 |
236 | case DW_OP_reg22: // 0x66 |
237 | case DW_OP_reg23: // 0x67 |
238 | case DW_OP_reg24: // 0x68 |
239 | case DW_OP_reg25: // 0x69 |
240 | case DW_OP_reg26: // 0x6A |
241 | case DW_OP_reg27: // 0x6B |
242 | case DW_OP_reg28: // 0x6C |
243 | case DW_OP_reg29: // 0x6D |
244 | case DW_OP_reg30: // 0x6E |
245 | case DW_OP_reg31: // 0x6F |
246 | case DW_OP_nop: // 0x96 |
247 | case DW_OP_push_object_address: // 0x97 DWARF3 |
248 | case DW_OP_form_tls_address: // 0x9b DWARF3 |
249 | case DW_OP_call_frame_cfa: // 0x9c DWARF3 |
250 | case DW_OP_stack_value: // 0x9f DWARF4 |
251 | case DW_OP_GNU_push_tls_address: // 0xe0 GNU extension |
252 | return 0; |
253 | |
254 | // Opcodes with a single 1 byte arguments |
255 | case DW_OP_const1u: // 0x08 1 1-byte constant |
256 | case DW_OP_const1s: // 0x09 1 1-byte constant |
257 | case DW_OP_pick: // 0x15 1 1-byte stack index |
258 | case DW_OP_deref_size: // 0x94 1 1-byte size of data retrieved |
259 | case DW_OP_xderef_size: // 0x95 1 1-byte size of data retrieved |
260 | return 1; |
261 | |
262 | // Opcodes with a single 2 byte arguments |
263 | case DW_OP_const2u: // 0x0a 1 2-byte constant |
264 | case DW_OP_const2s: // 0x0b 1 2-byte constant |
265 | case DW_OP_skip: // 0x2f 1 signed 2-byte constant |
266 | case DW_OP_bra: // 0x28 1 signed 2-byte constant |
267 | case DW_OP_call2: // 0x98 1 2-byte offset of DIE (DWARF3) |
268 | return 2; |
269 | |
270 | // Opcodes with a single 4 byte arguments |
271 | case DW_OP_const4u: // 0x0c 1 4-byte constant |
272 | case DW_OP_const4s: // 0x0d 1 4-byte constant |
273 | case DW_OP_call4: // 0x99 1 4-byte offset of DIE (DWARF3) |
274 | return 4; |
275 | |
276 | // Opcodes with a single 8 byte arguments |
277 | case DW_OP_const8u: // 0x0e 1 8-byte constant |
278 | case DW_OP_const8s: // 0x0f 1 8-byte constant |
279 | return 8; |
280 | |
281 | // All opcodes that have a single ULEB (signed or unsigned) argument |
282 | case DW_OP_addrx: // 0xa1 1 ULEB128 index |
283 | case DW_OP_constu: // 0x10 1 ULEB128 constant |
284 | case DW_OP_consts: // 0x11 1 SLEB128 constant |
285 | case DW_OP_plus_uconst: // 0x23 1 ULEB128 addend |
286 | case DW_OP_breg0: // 0x70 1 ULEB128 register |
287 | case DW_OP_breg1: // 0x71 1 ULEB128 register |
288 | case DW_OP_breg2: // 0x72 1 ULEB128 register |
289 | case DW_OP_breg3: // 0x73 1 ULEB128 register |
290 | case DW_OP_breg4: // 0x74 1 ULEB128 register |
291 | case DW_OP_breg5: // 0x75 1 ULEB128 register |
292 | case DW_OP_breg6: // 0x76 1 ULEB128 register |
293 | case DW_OP_breg7: // 0x77 1 ULEB128 register |
294 | case DW_OP_breg8: // 0x78 1 ULEB128 register |
295 | case DW_OP_breg9: // 0x79 1 ULEB128 register |
296 | case DW_OP_breg10: // 0x7a 1 ULEB128 register |
297 | case DW_OP_breg11: // 0x7b 1 ULEB128 register |
298 | case DW_OP_breg12: // 0x7c 1 ULEB128 register |
299 | case DW_OP_breg13: // 0x7d 1 ULEB128 register |
300 | case DW_OP_breg14: // 0x7e 1 ULEB128 register |
301 | case DW_OP_breg15: // 0x7f 1 ULEB128 register |
302 | case DW_OP_breg16: // 0x80 1 ULEB128 register |
303 | case DW_OP_breg17: // 0x81 1 ULEB128 register |
304 | case DW_OP_breg18: // 0x82 1 ULEB128 register |
305 | case DW_OP_breg19: // 0x83 1 ULEB128 register |
306 | case DW_OP_breg20: // 0x84 1 ULEB128 register |
307 | case DW_OP_breg21: // 0x85 1 ULEB128 register |
308 | case DW_OP_breg22: // 0x86 1 ULEB128 register |
309 | case DW_OP_breg23: // 0x87 1 ULEB128 register |
310 | case DW_OP_breg24: // 0x88 1 ULEB128 register |
311 | case DW_OP_breg25: // 0x89 1 ULEB128 register |
312 | case DW_OP_breg26: // 0x8a 1 ULEB128 register |
313 | case DW_OP_breg27: // 0x8b 1 ULEB128 register |
314 | case DW_OP_breg28: // 0x8c 1 ULEB128 register |
315 | case DW_OP_breg29: // 0x8d 1 ULEB128 register |
316 | case DW_OP_breg30: // 0x8e 1 ULEB128 register |
317 | case DW_OP_breg31: // 0x8f 1 ULEB128 register |
318 | case DW_OP_regx: // 0x90 1 ULEB128 register |
319 | case DW_OP_fbreg: // 0x91 1 SLEB128 offset |
320 | case DW_OP_piece: // 0x93 1 ULEB128 size of piece addressed |
321 | case DW_OP_GNU_addr_index: // 0xfb 1 ULEB128 index |
322 | case DW_OP_GNU_const_index: // 0xfc 1 ULEB128 index |
323 | data.Skip_LEB128(&offset); |
324 | return offset - data_offset; |
325 | |
326 | // All opcodes that have a 2 ULEB (signed or unsigned) arguments |
327 | case DW_OP_bregx: // 0x92 2 ULEB128 register followed by SLEB128 offset |
328 | case DW_OP_bit_piece: // 0x9d ULEB128 bit size, ULEB128 bit offset (DWARF3); |
329 | data.Skip_LEB128(&offset); |
330 | data.Skip_LEB128(&offset); |
331 | return offset - data_offset; |
332 | |
333 | case DW_OP_implicit_value: // 0x9e ULEB128 size followed by block of that size |
334 | // (DWARF4) |
335 | { |
336 | uint64_t block_len = data.Skip_LEB128(&offset); |
337 | offset += block_len; |
338 | return offset - data_offset; |
339 | } |
340 | |
341 | case DW_OP_GNU_entry_value: |
342 | case DW_OP_entry_value: // 0xa3 ULEB128 size + variable-length block |
343 | { |
344 | uint64_t subexpr_len = data.GetULEB128(&offset); |
345 | return (offset - data_offset) + subexpr_len; |
346 | } |
347 | |
348 | default: |
349 | if (!dwarf_cu) { |
350 | return LLDB_INVALID_OFFSET(18446744073709551615UL); |
351 | } |
352 | return dwarf_cu->GetSymbolFileDWARF().GetVendorDWARFOpcodeSize( |
353 | data, data_offset, op); |
354 | } |
355 | } |
356 | |
357 | lldb::addr_t DWARFExpression::GetLocation_DW_OP_addr(const DWARFUnit *dwarf_cu, |
358 | uint32_t op_addr_idx, |
359 | bool &error) const { |
360 | error = false; |
361 | lldb::offset_t offset = 0; |
362 | uint32_t curr_op_addr_idx = 0; |
363 | while (m_data.ValidOffset(offset)) { |
364 | const uint8_t op = m_data.GetU8(&offset); |
365 | |
366 | if (op == DW_OP_addr) { |
367 | const lldb::addr_t op_file_addr = m_data.GetAddress(&offset); |
368 | if (curr_op_addr_idx == op_addr_idx) |
369 | return op_file_addr; |
370 | ++curr_op_addr_idx; |
371 | } else if (op == DW_OP_GNU_addr_index || op == DW_OP_addrx) { |
372 | uint64_t index = m_data.GetULEB128(&offset); |
373 | if (curr_op_addr_idx == op_addr_idx) { |
374 | if (!dwarf_cu) { |
375 | error = true; |
376 | break; |
377 | } |
378 | |
379 | return dwarf_cu->ReadAddressFromDebugAddrSection(index); |
380 | } |
381 | ++curr_op_addr_idx; |
382 | } else { |
383 | const offset_t op_arg_size = |
384 | GetOpcodeDataSize(m_data, offset, op, dwarf_cu); |
385 | if (op_arg_size == LLDB_INVALID_OFFSET(18446744073709551615UL)) { |
386 | error = true; |
387 | break; |
388 | } |
389 | offset += op_arg_size; |
390 | } |
391 | } |
392 | return LLDB_INVALID_ADDRESS(18446744073709551615UL); |
393 | } |
394 | |
395 | bool DWARFExpression::Update_DW_OP_addr(const DWARFUnit *dwarf_cu, |
396 | lldb::addr_t file_addr) { |
397 | lldb::offset_t offset = 0; |
398 | while (m_data.ValidOffset(offset)) { |
399 | const uint8_t op = m_data.GetU8(&offset); |
400 | |
401 | if (op == DW_OP_addr) { |
402 | const uint32_t addr_byte_size = m_data.GetAddressByteSize(); |
403 | // We have to make a copy of the data as we don't know if this data is |
404 | // from a read only memory mapped buffer, so we duplicate all of the data |
405 | // first, then modify it, and if all goes well, we then replace the data |
406 | // for this expression |
407 | |
408 | // Make en encoder that contains a copy of the location expression data |
409 | // so we can write the address into the buffer using the correct byte |
410 | // order. |
411 | DataEncoder encoder(m_data.GetDataStart(), m_data.GetByteSize(), |
412 | m_data.GetByteOrder(), addr_byte_size); |
413 | |
414 | // Replace the address in the new buffer |
415 | if (encoder.PutAddress(offset, file_addr) == UINT32_MAX(4294967295U)) |
416 | return false; |
417 | |
418 | // All went well, so now we can reset the data using a shared pointer to |
419 | // the heap data so "m_data" will now correctly manage the heap data. |
420 | m_data.SetData(encoder.GetDataBuffer()); |
421 | return true; |
422 | } else { |
423 | const offset_t op_arg_size = |
424 | GetOpcodeDataSize(m_data, offset, op, dwarf_cu); |
425 | if (op_arg_size == LLDB_INVALID_OFFSET(18446744073709551615UL)) |
426 | break; |
427 | offset += op_arg_size; |
428 | } |
429 | } |
430 | return false; |
431 | } |
432 | |
433 | bool DWARFExpression::ContainsThreadLocalStorage( |
434 | const DWARFUnit *dwarf_cu) const { |
435 | lldb::offset_t offset = 0; |
436 | while (m_data.ValidOffset(offset)) { |
437 | const uint8_t op = m_data.GetU8(&offset); |
438 | |
439 | if (op == DW_OP_form_tls_address || op == DW_OP_GNU_push_tls_address) |
440 | return true; |
441 | const offset_t op_arg_size = |
442 | GetOpcodeDataSize(m_data, offset, op, dwarf_cu); |
443 | if (op_arg_size == LLDB_INVALID_OFFSET(18446744073709551615UL)) |
444 | return false; |
445 | offset += op_arg_size; |
446 | } |
447 | return false; |
448 | } |
449 | bool DWARFExpression::LinkThreadLocalStorage( |
450 | const DWARFUnit *dwarf_cu, |
451 | std::function<lldb::addr_t(lldb::addr_t file_addr)> const |
452 | &link_address_callback) { |
453 | const uint32_t addr_byte_size = m_data.GetAddressByteSize(); |
454 | // We have to make a copy of the data as we don't know if this data is from a |
455 | // read only memory mapped buffer, so we duplicate all of the data first, |
456 | // then modify it, and if all goes well, we then replace the data for this |
457 | // expression. |
458 | // Make en encoder that contains a copy of the location expression data so we |
459 | // can write the address into the buffer using the correct byte order. |
460 | DataEncoder encoder(m_data.GetDataStart(), m_data.GetByteSize(), |
461 | m_data.GetByteOrder(), addr_byte_size); |
462 | |
463 | lldb::offset_t offset = 0; |
464 | lldb::offset_t const_offset = 0; |
465 | lldb::addr_t const_value = 0; |
466 | size_t const_byte_size = 0; |
467 | while (m_data.ValidOffset(offset)) { |
468 | const uint8_t op = m_data.GetU8(&offset); |
469 | |
470 | bool decoded_data = false; |
471 | switch (op) { |
472 | case DW_OP_const4u: |
473 | // Remember the const offset in case we later have a |
474 | // DW_OP_form_tls_address or DW_OP_GNU_push_tls_address |
475 | const_offset = offset; |
476 | const_value = m_data.GetU32(&offset); |
477 | decoded_data = true; |
478 | const_byte_size = 4; |
479 | break; |
480 | |
481 | case DW_OP_const8u: |
482 | // Remember the const offset in case we later have a |
483 | // DW_OP_form_tls_address or DW_OP_GNU_push_tls_address |
484 | const_offset = offset; |
485 | const_value = m_data.GetU64(&offset); |
486 | decoded_data = true; |
487 | const_byte_size = 8; |
488 | break; |
489 | |
490 | case DW_OP_form_tls_address: |
491 | case DW_OP_GNU_push_tls_address: |
492 | // DW_OP_form_tls_address and DW_OP_GNU_push_tls_address must be preceded |
493 | // by a file address on the stack. We assume that DW_OP_const4u or |
494 | // DW_OP_const8u is used for these values, and we check that the last |
495 | // opcode we got before either of these was DW_OP_const4u or |
496 | // DW_OP_const8u. If so, then we can link the value accordingly. For |
497 | // Darwin, the value in the DW_OP_const4u or DW_OP_const8u is the file |
498 | // address of a structure that contains a function pointer, the pthread |
499 | // key and the offset into the data pointed to by the pthread key. So we |
500 | // must link this address and also set the module of this expression to |
501 | // the new_module_sp so we can resolve the file address correctly |
502 | if (const_byte_size > 0) { |
503 | lldb::addr_t linked_file_addr = link_address_callback(const_value); |
504 | if (linked_file_addr == LLDB_INVALID_ADDRESS(18446744073709551615UL)) |
505 | return false; |
506 | // Replace the address in the new buffer |
507 | if (encoder.PutUnsigned(const_offset, const_byte_size, |
508 | linked_file_addr) == UINT32_MAX(4294967295U)) |
509 | return false; |
510 | } |
511 | break; |
512 | |
513 | default: |
514 | const_offset = 0; |
515 | const_value = 0; |
516 | const_byte_size = 0; |
517 | break; |
518 | } |
519 | |
520 | if (!decoded_data) { |
521 | const offset_t op_arg_size = |
522 | GetOpcodeDataSize(m_data, offset, op, dwarf_cu); |
523 | if (op_arg_size == LLDB_INVALID_OFFSET(18446744073709551615UL)) |
524 | return false; |
525 | else |
526 | offset += op_arg_size; |
527 | } |
528 | } |
529 | |
530 | m_data.SetData(encoder.GetDataBuffer()); |
531 | return true; |
532 | } |
533 | |
534 | static bool Evaluate_DW_OP_entry_value(std::vector<Value> &stack, |
535 | ExecutionContext *exe_ctx, |
536 | RegisterContext *reg_ctx, |
537 | const DataExtractor &opcodes, |
538 | lldb::offset_t &opcode_offset, |
539 | Status *error_ptr, Log *log) { |
540 | // DW_OP_entry_value(sub-expr) describes the location a variable had upon |
541 | // function entry: this variable location is presumed to be optimized out at |
542 | // the current PC value. The caller of the function may have call site |
543 | // information that describes an alternate location for the variable (e.g. a |
544 | // constant literal, or a spilled stack value) in the parent frame. |
545 | // |
546 | // Example (this is pseudo-code & pseudo-DWARF, but hopefully illustrative): |
547 | // |
548 | // void child(int &sink, int x) { |
549 | // ... |
550 | // /* "x" gets optimized out. */ |
551 | // |
552 | // /* The location of "x" here is: DW_OP_entry_value($reg2). */ |
553 | // ++sink; |
554 | // } |
555 | // |
556 | // void parent() { |
557 | // int sink; |
558 | // |
559 | // /* |
560 | // * The callsite information emitted here is: |
561 | // * |
562 | // * DW_TAG_call_site |
563 | // * DW_AT_return_pc ... (for "child(sink, 123);") |
564 | // * DW_TAG_call_site_parameter (for "sink") |
565 | // * DW_AT_location ($reg1) |
566 | // * DW_AT_call_value ($SP - 8) |
567 | // * DW_TAG_call_site_parameter (for "x") |
568 | // * DW_AT_location ($reg2) |
569 | // * DW_AT_call_value ($literal 123) |
570 | // * |
571 | // * DW_TAG_call_site |
572 | // * DW_AT_return_pc ... (for "child(sink, 456);") |
573 | // * ... |
574 | // */ |
575 | // child(sink, 123); |
576 | // child(sink, 456); |
577 | // } |
578 | // |
579 | // When the program stops at "++sink" within `child`, the debugger determines |
580 | // the call site by analyzing the return address. Once the call site is found, |
581 | // the debugger determines which parameter is referenced by DW_OP_entry_value |
582 | // and evaluates the corresponding location for that parameter in `parent`. |
583 | |
584 | // 1. Find the function which pushed the current frame onto the stack. |
585 | if ((!exe_ctx || !exe_ctx->HasTargetScope()) || !reg_ctx) { |
586 | LLDB_LOG(log, "Evaluate_DW_OP_entry_value: no exe/reg context")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Expression/DWARFExpression.cpp" , __func__, "Evaluate_DW_OP_entry_value: no exe/reg context") ; } while (0); |
587 | return false; |
588 | } |
589 | |
590 | StackFrame *current_frame = exe_ctx->GetFramePtr(); |
591 | Thread *thread = exe_ctx->GetThreadPtr(); |
592 | if (!current_frame || !thread) { |
593 | LLDB_LOG(log, "Evaluate_DW_OP_entry_value: no current frame/thread")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Expression/DWARFExpression.cpp" , __func__, "Evaluate_DW_OP_entry_value: no current frame/thread" ); } while (0); |
594 | return false; |
595 | } |
596 | |
597 | Target &target = exe_ctx->GetTargetRef(); |
598 | StackFrameSP parent_frame = nullptr; |
599 | addr_t return_pc = LLDB_INVALID_ADDRESS(18446744073709551615UL); |
600 | uint32_t current_frame_idx = current_frame->GetFrameIndex(); |
601 | uint32_t num_frames = thread->GetStackFrameCount(); |
602 | for (uint32_t parent_frame_idx = current_frame_idx + 1; |
603 | parent_frame_idx < num_frames; ++parent_frame_idx) { |
604 | parent_frame = thread->GetStackFrameAtIndex(parent_frame_idx); |
605 | // Require a valid sequence of frames. |
606 | if (!parent_frame) |
607 | break; |
608 | |
609 | // Record the first valid return address, even if this is an inlined frame, |
610 | // in order to look up the associated call edge in the first non-inlined |
611 | // parent frame. |
612 | if (return_pc == LLDB_INVALID_ADDRESS(18446744073709551615UL)) { |
613 | return_pc = parent_frame->GetFrameCodeAddress().GetLoadAddress(&target); |
614 | LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Expression/DWARFExpression.cpp" , __func__, "Evaluate_DW_OP_entry_value: immediate ancestor with pc = {0:x}" , return_pc); } while (0) |
615 | "Evaluate_DW_OP_entry_value: immediate ancestor with pc = {0:x}",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Expression/DWARFExpression.cpp" , __func__, "Evaluate_DW_OP_entry_value: immediate ancestor with pc = {0:x}" , return_pc); } while (0) |
616 | return_pc)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Expression/DWARFExpression.cpp" , __func__, "Evaluate_DW_OP_entry_value: immediate ancestor with pc = {0:x}" , return_pc); } while (0); |
617 | } |
618 | |
619 | // If we've found an inlined frame, skip it (these have no call site |
620 | // parameters). |
621 | if (parent_frame->IsInlined()) |
622 | continue; |
623 | |
624 | // We've found the first non-inlined parent frame. |
625 | break; |
626 | } |
627 | if (!parent_frame || !parent_frame->GetRegisterContext()) { |
628 | LLDB_LOG(log, "Evaluate_DW_OP_entry_value: no parent frame with reg ctx")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Expression/DWARFExpression.cpp" , __func__, "Evaluate_DW_OP_entry_value: no parent frame with reg ctx" ); } while (0); |
629 | return false; |
630 | } |
631 | |
632 | Function *parent_func = |
633 | parent_frame->GetSymbolContext(eSymbolContextFunction).function; |
634 | if (!parent_func) { |
635 | LLDB_LOG(log, "Evaluate_DW_OP_entry_value: no parent function")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Expression/DWARFExpression.cpp" , __func__, "Evaluate_DW_OP_entry_value: no parent function") ; } while (0); |
636 | return false; |
637 | } |
638 | |
639 | // 2. Find the call edge in the parent function responsible for creating the |
640 | // current activation. |
641 | Function *current_func = |
642 | current_frame->GetSymbolContext(eSymbolContextFunction).function; |
643 | if (!current_func) { |
644 | LLDB_LOG(log, "Evaluate_DW_OP_entry_value: no current function")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Expression/DWARFExpression.cpp" , __func__, "Evaluate_DW_OP_entry_value: no current function" ); } while (0); |
645 | return false; |
646 | } |
647 | |
648 | CallEdge *call_edge = nullptr; |
649 | ModuleList &modlist = target.GetImages(); |
650 | ExecutionContext parent_exe_ctx = *exe_ctx; |
651 | parent_exe_ctx.SetFrameSP(parent_frame); |
652 | if (!parent_frame->IsArtificial()) { |
653 | // If the parent frame is not artificial, the current activation may be |
654 | // produced by an ambiguous tail call. In this case, refuse to proceed. |
655 | call_edge = parent_func->GetCallEdgeForReturnAddress(return_pc, target); |
656 | if (!call_edge) { |
657 | LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Expression/DWARFExpression.cpp" , __func__, "Evaluate_DW_OP_entry_value: no call edge for retn-pc = {0:x} " "in parent frame {1}", return_pc, parent_func->GetName()) ; } while (0) |
658 | "Evaluate_DW_OP_entry_value: no call edge for retn-pc = {0:x} "do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Expression/DWARFExpression.cpp" , __func__, "Evaluate_DW_OP_entry_value: no call edge for retn-pc = {0:x} " "in parent frame {1}", return_pc, parent_func->GetName()) ; } while (0) |
659 | "in parent frame {1}",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Expression/DWARFExpression.cpp" , __func__, "Evaluate_DW_OP_entry_value: no call edge for retn-pc = {0:x} " "in parent frame {1}", return_pc, parent_func->GetName()) ; } while (0) |
660 | return_pc, parent_func->GetName())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Expression/DWARFExpression.cpp" , __func__, "Evaluate_DW_OP_entry_value: no call edge for retn-pc = {0:x} " "in parent frame {1}", return_pc, parent_func->GetName()) ; } while (0); |
661 | return false; |
662 | } |
663 | Function *callee_func = call_edge->GetCallee(modlist, parent_exe_ctx); |
664 | if (callee_func != current_func) { |
665 | LLDB_LOG(log, "Evaluate_DW_OP_entry_value: ambiguous call sequence, "do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Expression/DWARFExpression.cpp" , __func__, "Evaluate_DW_OP_entry_value: ambiguous call sequence, " "can't find real parent frame"); } while (0) |
666 | "can't find real parent frame")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Expression/DWARFExpression.cpp" , __func__, "Evaluate_DW_OP_entry_value: ambiguous call sequence, " "can't find real parent frame"); } while (0); |
667 | return false; |
668 | } |
669 | } else { |
670 | // The StackFrameList solver machinery has deduced that an unambiguous tail |
671 | // call sequence that produced the current activation. The first edge in |
672 | // the parent that points to the current function must be valid. |
673 | for (auto &edge : parent_func->GetTailCallingEdges()) { |
674 | if (edge->GetCallee(modlist, parent_exe_ctx) == current_func) { |
675 | call_edge = edge.get(); |
676 | break; |
677 | } |
678 | } |
679 | } |
680 | if (!call_edge) { |
681 | LLDB_LOG(log, "Evaluate_DW_OP_entry_value: no unambiguous edge from parent "do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Expression/DWARFExpression.cpp" , __func__, "Evaluate_DW_OP_entry_value: no unambiguous edge from parent " "to current function"); } while (0) |
682 | "to current function")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Expression/DWARFExpression.cpp" , __func__, "Evaluate_DW_OP_entry_value: no unambiguous edge from parent " "to current function"); } while (0); |
683 | return false; |
684 | } |
685 | |
686 | // 3. Attempt to locate the DW_OP_entry_value expression in the set of |
687 | // available call site parameters. If found, evaluate the corresponding |
688 | // parameter in the context of the parent frame. |
689 | const uint32_t subexpr_len = opcodes.GetULEB128(&opcode_offset); |
690 | const void *subexpr_data = opcodes.GetData(&opcode_offset, subexpr_len); |
691 | if (!subexpr_data) { |
692 | LLDB_LOG(log, "Evaluate_DW_OP_entry_value: subexpr could not be read")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Expression/DWARFExpression.cpp" , __func__, "Evaluate_DW_OP_entry_value: subexpr could not be read" ); } while (0); |
693 | return false; |
694 | } |
695 | |
696 | const CallSiteParameter *matched_param = nullptr; |
697 | for (const CallSiteParameter ¶m : call_edge->GetCallSiteParameters()) { |
698 | DataExtractor param_subexpr_extractor; |
699 | if (!param.LocationInCallee.GetExpressionData(param_subexpr_extractor)) |
700 | continue; |
701 | lldb::offset_t param_subexpr_offset = 0; |
702 | const void *param_subexpr_data = |
703 | param_subexpr_extractor.GetData(¶m_subexpr_offset, subexpr_len); |
704 | if (!param_subexpr_data || |
705 | param_subexpr_extractor.BytesLeft(param_subexpr_offset) != 0) |
706 | continue; |
707 | |
708 | // At this point, the DW_OP_entry_value sub-expression and the callee-side |
709 | // expression in the call site parameter are known to have the same length. |
710 | // Check whether they are equal. |
711 | // |
712 | // Note that an equality check is sufficient: the contents of the |
713 | // DW_OP_entry_value subexpression are only used to identify the right call |
714 | // site parameter in the parent, and do not require any special handling. |
715 | if (memcmp(subexpr_data, param_subexpr_data, subexpr_len) == 0) { |
716 | matched_param = ¶m; |
717 | break; |
718 | } |
719 | } |
720 | if (!matched_param) { |
721 | LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Expression/DWARFExpression.cpp" , __func__, "Evaluate_DW_OP_entry_value: no matching call site param found" ); } while (0) |
722 | "Evaluate_DW_OP_entry_value: no matching call site param found")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Expression/DWARFExpression.cpp" , __func__, "Evaluate_DW_OP_entry_value: no matching call site param found" ); } while (0); |
723 | return false; |
724 | } |
725 | |
726 | // TODO: Add support for DW_OP_push_object_address within a DW_OP_entry_value |
727 | // subexpresion whenever llvm does. |
728 | Value result; |
729 | const DWARFExpressionList ¶m_expr = matched_param->LocationInCaller; |
730 | if (!param_expr.Evaluate(&parent_exe_ctx, |
731 | parent_frame->GetRegisterContext().get(), |
732 | LLDB_INVALID_ADDRESS(18446744073709551615UL), |
733 | /*initial_value_ptr=*/nullptr, |
734 | /*object_address_ptr=*/nullptr, result, error_ptr)) { |
735 | LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Expression/DWARFExpression.cpp" , __func__, "Evaluate_DW_OP_entry_value: call site param evaluation failed" ); } while (0) |
736 | "Evaluate_DW_OP_entry_value: call site param evaluation failed")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Expression/DWARFExpression.cpp" , __func__, "Evaluate_DW_OP_entry_value: call site param evaluation failed" ); } while (0); |
737 | return false; |
738 | } |
739 | |
740 | stack.push_back(result); |
741 | return true; |
742 | } |
743 | |
744 | namespace { |
745 | /// The location description kinds described by the DWARF v5 |
746 | /// specification. Composite locations are handled out-of-band and |
747 | /// thus aren't part of the enum. |
748 | enum LocationDescriptionKind { |
749 | Empty, |
750 | Memory, |
751 | Register, |
752 | Implicit |
753 | /* Composite*/ |
754 | }; |
755 | /// Adjust value's ValueType according to the kind of location description. |
756 | void UpdateValueTypeFromLocationDescription(Log *log, const DWARFUnit *dwarf_cu, |
757 | LocationDescriptionKind kind, |
758 | Value *value = nullptr) { |
759 | // Note that this function is conflating DWARF expressions with |
760 | // DWARF location descriptions. Perhaps it would be better to define |
761 | // a wrapper for DWARFExpression::Eval() that deals with DWARF |
762 | // location descriptions (which consist of one or more DWARF |
763 | // expressions). But doing this would mean we'd also need factor the |
764 | // handling of DW_OP_(bit_)piece out of this function. |
765 | if (dwarf_cu && dwarf_cu->GetVersion() >= 4) { |
766 | const char *log_msg = "DWARF location description kind: %s"; |
767 | switch (kind) { |
768 | case Empty: |
769 | LLDB_LOGF(log, log_msg, "Empty")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(log_msg, "Empty"); } while (0); |
770 | break; |
771 | case Memory: |
772 | LLDB_LOGF(log, log_msg, "Memory")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(log_msg, "Memory"); } while (0); |
773 | if (value->GetValueType() == Value::ValueType::Scalar) |
774 | value->SetValueType(Value::ValueType::LoadAddress); |
775 | break; |
776 | case Register: |
777 | LLDB_LOGF(log, log_msg, "Register")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(log_msg, "Register"); } while (0); |
778 | value->SetValueType(Value::ValueType::Scalar); |
779 | break; |
780 | case Implicit: |
781 | LLDB_LOGF(log, log_msg, "Implicit")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(log_msg, "Implicit"); } while (0); |
782 | if (value->GetValueType() == Value::ValueType::LoadAddress) |
783 | value->SetValueType(Value::ValueType::Scalar); |
784 | break; |
785 | } |
786 | } |
787 | } |
788 | } // namespace |
789 | |
790 | /// Helper function to move common code used to resolve a file address and turn |
791 | /// into a load address. |
792 | /// |
793 | /// \param exe_ctx Pointer to the execution context |
794 | /// \param module_sp shared_ptr contains the module if we have one |
795 | /// \param error_ptr pointer to Status object if we have one |
796 | /// \param dw_op_type C-style string used to vary the error output |
797 | /// \param file_addr the file address we are trying to resolve and turn into a |
798 | /// load address |
799 | /// \param so_addr out parameter, will be set to load address or section offset |
800 | /// \param check_sectionoffset bool which determines if having a section offset |
801 | /// but not a load address is considerd a success |
802 | /// \returns std::optional containing the load address if resolving and getting |
803 | /// the load address succeed or an empty Optinal otherwise. If |
804 | /// check_sectionoffset is true we consider LLDB_INVALID_ADDRESS a |
805 | /// success if so_addr.IsSectionOffset() is true. |
806 | static std::optional<lldb::addr_t> |
807 | ResolveLoadAddress(ExecutionContext *exe_ctx, lldb::ModuleSP &module_sp, |
808 | Status *error_ptr, const char *dw_op_type, |
809 | lldb::addr_t file_addr, Address &so_addr, |
810 | bool check_sectionoffset = false) { |
811 | if (!module_sp) { |
812 | if (error_ptr) |
813 | error_ptr->SetErrorStringWithFormat( |
814 | "need module to resolve file address for %s", dw_op_type); |
815 | return {}; |
816 | } |
817 | |
818 | if (!module_sp->ResolveFileAddress(file_addr, so_addr)) { |
819 | if (error_ptr) |
820 | error_ptr->SetErrorString("failed to resolve file address in module"); |
821 | return {}; |
822 | } |
823 | |
824 | addr_t load_addr = so_addr.GetLoadAddress(exe_ctx->GetTargetPtr()); |
825 | |
826 | if (load_addr == LLDB_INVALID_ADDRESS(18446744073709551615UL) && |
827 | (check_sectionoffset && !so_addr.IsSectionOffset())) { |
828 | if (error_ptr) |
829 | error_ptr->SetErrorString("failed to resolve load address"); |
830 | return {}; |
831 | } |
832 | |
833 | return load_addr; |
834 | } |
835 | |
836 | /// Helper function to move common code used to load sized data from a uint8_t |
837 | /// buffer. |
838 | /// |
839 | /// \param addr_bytes uint8_t buffer containg raw data |
840 | /// \param size_addr_bytes how large is the underlying raw data |
841 | /// \param byte_order what is the byter order of the underlyig data |
842 | /// \param size How much of the underlying data we want to use |
843 | /// \return The underlying data converted into a Scalar |
844 | static Scalar DerefSizeExtractDataHelper(uint8_t *addr_bytes, |
845 | size_t size_addr_bytes, |
846 | ByteOrder byte_order, size_t size) { |
847 | DataExtractor addr_data(addr_bytes, size_addr_bytes, byte_order, size); |
848 | |
849 | lldb::offset_t addr_data_offset = 0; |
850 | if (size <= 8) |
851 | return addr_data.GetMaxU64(&addr_data_offset, size); |
852 | else |
853 | return addr_data.GetAddress(&addr_data_offset); |
854 | } |
855 | |
856 | bool DWARFExpression::Evaluate( |
857 | ExecutionContext *exe_ctx, RegisterContext *reg_ctx, |
858 | lldb::ModuleSP module_sp, const DataExtractor &opcodes, |
859 | const DWARFUnit *dwarf_cu, const lldb::RegisterKind reg_kind, |
860 | const Value *initial_value_ptr, const Value *object_address_ptr, |
861 | Value &result, Status *error_ptr) { |
862 | |
863 | if (opcodes.GetByteSize() == 0) { |
864 | if (error_ptr) |
865 | error_ptr->SetErrorString( |
866 | "no location, value may have been optimized out"); |
867 | return false; |
868 | } |
869 | std::vector<Value> stack; |
870 | |
871 | Process *process = nullptr; |
872 | StackFrame *frame = nullptr; |
873 | Target *target = nullptr; |
874 | |
875 | if (exe_ctx) { |
876 | process = exe_ctx->GetProcessPtr(); |
877 | frame = exe_ctx->GetFramePtr(); |
878 | target = exe_ctx->GetTargetPtr(); |
879 | } |
880 | if (reg_ctx == nullptr && frame) |
881 | reg_ctx = frame->GetRegisterContext().get(); |
882 | |
883 | if (initial_value_ptr) |
884 | stack.push_back(*initial_value_ptr); |
885 | |
886 | lldb::offset_t offset = 0; |
887 | Value tmp; |
888 | uint32_t reg_num; |
889 | |
890 | /// Insertion point for evaluating multi-piece expression. |
891 | uint64_t op_piece_offset = 0; |
892 | Value pieces; // Used for DW_OP_piece |
893 | |
894 | Log *log = GetLog(LLDBLog::Expressions); |
895 | // A generic type is "an integral type that has the size of an address and an |
896 | // unspecified signedness". For now, just use the signedness of the operand. |
897 | // TODO: Implement a real typed stack, and store the genericness of the value |
898 | // there. |
899 | auto to_generic = [&](auto v) { |
900 | bool is_signed = std::is_signed<decltype(v)>::value; |
901 | return Scalar(llvm::APSInt( |
902 | llvm::APInt(8 * opcodes.GetAddressByteSize(), v, is_signed), |
903 | !is_signed)); |
904 | }; |
905 | |
906 | // The default kind is a memory location. This is updated by any |
907 | // operation that changes this, such as DW_OP_stack_value, and reset |
908 | // by composition operations like DW_OP_piece. |
909 | LocationDescriptionKind dwarf4_location_description_kind = Memory; |
910 | |
911 | while (opcodes.ValidOffset(offset)) { |
912 | const lldb::offset_t op_offset = offset; |
913 | const uint8_t op = opcodes.GetU8(&offset); |
914 | |
915 | if (log && log->GetVerbose()) { |
916 | size_t count = stack.size(); |
917 | LLDB_LOGF(log, "Stack before operation has %" PRIu64 " values:",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("Stack before operation has %" "l" "u" " values:", (uint64_t)count); } while (0) |
918 | (uint64_t)count)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("Stack before operation has %" "l" "u" " values:", (uint64_t)count); } while (0); |
919 | for (size_t i = 0; i < count; ++i) { |
920 | StreamString new_value; |
921 | new_value.Printf("[%" PRIu64"l" "u" "]", (uint64_t)i); |
922 | stack[i].Dump(&new_value); |
923 | LLDB_LOGF(log, " %s", new_value.GetData())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" %s", new_value.GetData()); } while (0); |
924 | } |
925 | LLDB_LOGF(log, "0x%8.8" PRIx64 ": %s", op_offset,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("0x%8.8" "l" "x" ": %s", op_offset, DW_OP_value_to_name (op)); } while (0) |
926 | DW_OP_value_to_name(op))do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("0x%8.8" "l" "x" ": %s", op_offset, DW_OP_value_to_name (op)); } while (0); |
927 | } |
928 | |
929 | switch (op) { |
930 | // The DW_OP_addr operation has a single operand that encodes a machine |
931 | // address and whose size is the size of an address on the target machine. |
932 | case DW_OP_addr: |
933 | stack.push_back(Scalar(opcodes.GetAddress(&offset))); |
934 | if (target && |
935 | target->GetArchitecture().GetCore() == ArchSpec::eCore_wasm32) { |
936 | // wasm file sections aren't mapped into memory, therefore addresses can |
937 | // never point into a file section and are always LoadAddresses. |
938 | stack.back().SetValueType(Value::ValueType::LoadAddress); |
939 | } else { |
940 | stack.back().SetValueType(Value::ValueType::FileAddress); |
941 | } |
942 | break; |
943 | |
944 | // The DW_OP_addr_sect_offset4 is used for any location expressions in |
945 | // shared libraries that have a location like: |
946 | // DW_OP_addr(0x1000) |
947 | // If this address resides in a shared library, then this virtual address |
948 | // won't make sense when it is evaluated in the context of a running |
949 | // process where shared libraries have been slid. To account for this, this |
950 | // new address type where we can store the section pointer and a 4 byte |
951 | // offset. |
952 | // case DW_OP_addr_sect_offset4: |
953 | // { |
954 | // result_type = eResultTypeFileAddress; |
955 | // lldb::Section *sect = (lldb::Section |
956 | // *)opcodes.GetMaxU64(&offset, sizeof(void *)); |
957 | // lldb::addr_t sect_offset = opcodes.GetU32(&offset); |
958 | // |
959 | // Address so_addr (sect, sect_offset); |
960 | // lldb::addr_t load_addr = so_addr.GetLoadAddress(); |
961 | // if (load_addr != LLDB_INVALID_ADDRESS) |
962 | // { |
963 | // // We successfully resolve a file address to a load |
964 | // // address. |
965 | // stack.push_back(load_addr); |
966 | // break; |
967 | // } |
968 | // else |
969 | // { |
970 | // // We were able |
971 | // if (error_ptr) |
972 | // error_ptr->SetErrorStringWithFormat ("Section %s in |
973 | // %s is not currently loaded.\n", |
974 | // sect->GetName().AsCString(), |
975 | // sect->GetModule()->GetFileSpec().GetFilename().AsCString()); |
976 | // return false; |
977 | // } |
978 | // } |
979 | // break; |
980 | |
981 | // OPCODE: DW_OP_deref |
982 | // OPERANDS: none |
983 | // DESCRIPTION: Pops the top stack entry and treats it as an address. |
984 | // The value retrieved from that address is pushed. The size of the data |
985 | // retrieved from the dereferenced address is the size of an address on the |
986 | // target machine. |
987 | case DW_OP_deref: { |
988 | if (stack.empty()) { |
989 | if (error_ptr) |
990 | error_ptr->SetErrorString("Expression stack empty for DW_OP_deref."); |
991 | return false; |
992 | } |
993 | Value::ValueType value_type = stack.back().GetValueType(); |
994 | switch (value_type) { |
995 | case Value::ValueType::HostAddress: { |
996 | void *src = (void *)stack.back().GetScalar().ULongLong(); |
997 | intptr_t ptr; |
998 | ::memcpy(&ptr, src, sizeof(void *)); |
999 | stack.back().GetScalar() = ptr; |
1000 | stack.back().ClearContext(); |
1001 | } break; |
1002 | case Value::ValueType::FileAddress: { |
1003 | auto file_addr = stack.back().GetScalar().ULongLong( |
1004 | LLDB_INVALID_ADDRESS(18446744073709551615UL)); |
1005 | |
1006 | Address so_addr; |
1007 | auto maybe_load_addr = ResolveLoadAddress( |
1008 | exe_ctx, module_sp, error_ptr, "DW_OP_deref", file_addr, so_addr); |
1009 | |
1010 | if (!maybe_load_addr) |
1011 | return false; |
1012 | |
1013 | stack.back().GetScalar() = *maybe_load_addr; |
1014 | // Fall through to load address promotion code below. |
1015 | } |
1016 | [[fallthrough]]; |
1017 | case Value::ValueType::Scalar: |
1018 | // Promote Scalar to LoadAddress and fall through. |
1019 | stack.back().SetValueType(Value::ValueType::LoadAddress); |
1020 | [[fallthrough]]; |
1021 | case Value::ValueType::LoadAddress: |
1022 | if (exe_ctx) { |
1023 | if (process) { |
1024 | lldb::addr_t pointer_addr = |
1025 | stack.back().GetScalar().ULongLong(LLDB_INVALID_ADDRESS(18446744073709551615UL)); |
1026 | Status error; |
1027 | lldb::addr_t pointer_value = |
1028 | process->ReadPointerFromMemory(pointer_addr, error); |
1029 | if (pointer_value != LLDB_INVALID_ADDRESS(18446744073709551615UL)) { |
1030 | if (ABISP abi_sp = process->GetABI()) |
1031 | pointer_value = abi_sp->FixCodeAddress(pointer_value); |
1032 | stack.back().GetScalar() = pointer_value; |
1033 | stack.back().ClearContext(); |
1034 | } else { |
1035 | if (error_ptr) |
1036 | error_ptr->SetErrorStringWithFormat( |
1037 | "Failed to dereference pointer from 0x%" PRIx64"l" "x" |
1038 | " for DW_OP_deref: %s\n", |
1039 | pointer_addr, error.AsCString()); |
1040 | return false; |
1041 | } |
1042 | } else { |
1043 | if (error_ptr) |
1044 | error_ptr->SetErrorString("NULL process for DW_OP_deref.\n"); |
1045 | return false; |
1046 | } |
1047 | } else { |
1048 | if (error_ptr) |
1049 | error_ptr->SetErrorString( |
1050 | "NULL execution context for DW_OP_deref.\n"); |
1051 | return false; |
1052 | } |
1053 | break; |
1054 | |
1055 | case Value::ValueType::Invalid: |
1056 | if (error_ptr) |
1057 | error_ptr->SetErrorString("Invalid value type for DW_OP_deref.\n"); |
1058 | return false; |
1059 | } |
1060 | |
1061 | } break; |
1062 | |
1063 | // OPCODE: DW_OP_deref_size |
1064 | // OPERANDS: 1 |
1065 | // 1 - uint8_t that specifies the size of the data to dereference. |
1066 | // DESCRIPTION: Behaves like the DW_OP_deref operation: it pops the top |
1067 | // stack entry and treats it as an address. The value retrieved from that |
1068 | // address is pushed. In the DW_OP_deref_size operation, however, the size |
1069 | // in bytes of the data retrieved from the dereferenced address is |
1070 | // specified by the single operand. This operand is a 1-byte unsigned |
1071 | // integral constant whose value may not be larger than the size of an |
1072 | // address on the target machine. The data retrieved is zero extended to |
1073 | // the size of an address on the target machine before being pushed on the |
1074 | // expression stack. |
1075 | case DW_OP_deref_size: { |
1076 | if (stack.empty()) { |
1077 | if (error_ptr) |
1078 | error_ptr->SetErrorString( |
1079 | "Expression stack empty for DW_OP_deref_size."); |
1080 | return false; |
1081 | } |
1082 | uint8_t size = opcodes.GetU8(&offset); |
1083 | Value::ValueType value_type = stack.back().GetValueType(); |
1084 | switch (value_type) { |
1085 | case Value::ValueType::HostAddress: { |
1086 | void *src = (void *)stack.back().GetScalar().ULongLong(); |
1087 | intptr_t ptr; |
1088 | ::memcpy(&ptr, src, sizeof(void *)); |
1089 | // I can't decide whether the size operand should apply to the bytes in |
1090 | // their |
1091 | // lldb-host endianness or the target endianness.. I doubt this'll ever |
1092 | // come up but I'll opt for assuming big endian regardless. |
1093 | switch (size) { |
1094 | case 1: |
1095 | ptr = ptr & 0xff; |
1096 | break; |
1097 | case 2: |
1098 | ptr = ptr & 0xffff; |
1099 | break; |
1100 | case 3: |
1101 | ptr = ptr & 0xffffff; |
1102 | break; |
1103 | case 4: |
1104 | ptr = ptr & 0xffffffff; |
1105 | break; |
1106 | // the casts are added to work around the case where intptr_t is a 32 |
1107 | // bit quantity; |
1108 | // presumably we won't hit the 5..7 cases if (void*) is 32-bits in this |
1109 | // program. |
1110 | case 5: |
1111 | ptr = (intptr_t)ptr & 0xffffffffffULL; |
1112 | break; |
1113 | case 6: |
1114 | ptr = (intptr_t)ptr & 0xffffffffffffULL; |
1115 | break; |
1116 | case 7: |
1117 | ptr = (intptr_t)ptr & 0xffffffffffffffULL; |
1118 | break; |
1119 | default: |
1120 | break; |
1121 | } |
1122 | stack.back().GetScalar() = ptr; |
1123 | stack.back().ClearContext(); |
1124 | } break; |
1125 | case Value::ValueType::FileAddress: { |
1126 | auto file_addr = |
1127 | stack.back().GetScalar().ULongLong(LLDB_INVALID_ADDRESS(18446744073709551615UL)); |
1128 | Address so_addr; |
1129 | auto maybe_load_addr = |
1130 | ResolveLoadAddress(exe_ctx, module_sp, error_ptr, |
1131 | "DW_OP_deref_size", file_addr, so_addr, |
1132 | /*check_sectionoffset=*/true); |
1133 | |
1134 | if (!maybe_load_addr) |
1135 | return false; |
1136 | |
1137 | addr_t load_addr = *maybe_load_addr; |
1138 | |
1139 | if (load_addr == LLDB_INVALID_ADDRESS(18446744073709551615UL) && so_addr.IsSectionOffset()) { |
1140 | uint8_t addr_bytes[8]; |
1141 | Status error; |
1142 | |
1143 | if (target && |
1144 | target->ReadMemory(so_addr, &addr_bytes, size, error, |
1145 | /*force_live_memory=*/false) == size) { |
1146 | ObjectFile *objfile = module_sp->GetObjectFile(); |
1147 | |
1148 | stack.back().GetScalar() = DerefSizeExtractDataHelper( |
1149 | addr_bytes, size, objfile->GetByteOrder(), size); |
1150 | stack.back().ClearContext(); |
1151 | break; |
1152 | } else { |
1153 | if (error_ptr) |
1154 | error_ptr->SetErrorStringWithFormat( |
1155 | "Failed to dereference pointer for for DW_OP_deref_size: " |
1156 | "%s\n", |
1157 | error.AsCString()); |
1158 | return false; |
1159 | } |
1160 | } |
1161 | stack.back().GetScalar() = load_addr; |
1162 | // Fall through to load address promotion code below. |
1163 | } |
1164 | |
1165 | [[fallthrough]]; |
1166 | case Value::ValueType::Scalar: |
1167 | case Value::ValueType::LoadAddress: |
1168 | if (exe_ctx) { |
1169 | if (process) { |
1170 | lldb::addr_t pointer_addr = |
1171 | stack.back().GetScalar().ULongLong(LLDB_INVALID_ADDRESS(18446744073709551615UL)); |
1172 | uint8_t addr_bytes[sizeof(lldb::addr_t)]; |
1173 | Status error; |
1174 | if (process->ReadMemory(pointer_addr, &addr_bytes, size, error) == |
1175 | size) { |
1176 | |
1177 | stack.back().GetScalar() = |
1178 | DerefSizeExtractDataHelper(addr_bytes, sizeof(addr_bytes), |
1179 | process->GetByteOrder(), size); |
1180 | stack.back().ClearContext(); |
1181 | } else { |
1182 | if (error_ptr) |
1183 | error_ptr->SetErrorStringWithFormat( |
1184 | "Failed to dereference pointer from 0x%" PRIx64"l" "x" |
1185 | " for DW_OP_deref: %s\n", |
1186 | pointer_addr, error.AsCString()); |
1187 | return false; |
1188 | } |
1189 | } else { |
1190 | if (error_ptr) |
1191 | error_ptr->SetErrorString("NULL process for DW_OP_deref_size.\n"); |
1192 | return false; |
1193 | } |
1194 | } else { |
1195 | if (error_ptr) |
1196 | error_ptr->SetErrorString( |
1197 | "NULL execution context for DW_OP_deref_size.\n"); |
1198 | return false; |
1199 | } |
1200 | break; |
1201 | |
1202 | case Value::ValueType::Invalid: |
1203 | if (error_ptr) |
1204 | error_ptr->SetErrorString("Invalid value for DW_OP_deref_size.\n"); |
1205 | return false; |
1206 | } |
1207 | |
1208 | } break; |
1209 | |
1210 | // OPCODE: DW_OP_xderef_size |
1211 | // OPERANDS: 1 |
1212 | // 1 - uint8_t that specifies the size of the data to dereference. |
1213 | // DESCRIPTION: Behaves like the DW_OP_xderef operation: the entry at |
1214 | // the top of the stack is treated as an address. The second stack entry is |
1215 | // treated as an "address space identifier" for those architectures that |
1216 | // support multiple address spaces. The top two stack elements are popped, |
1217 | // a data item is retrieved through an implementation-defined address |
1218 | // calculation and pushed as the new stack top. In the DW_OP_xderef_size |
1219 | // operation, however, the size in bytes of the data retrieved from the |
1220 | // dereferenced address is specified by the single operand. This operand is |
1221 | // a 1-byte unsigned integral constant whose value may not be larger than |
1222 | // the size of an address on the target machine. The data retrieved is zero |
1223 | // extended to the size of an address on the target machine before being |
1224 | // pushed on the expression stack. |
1225 | case DW_OP_xderef_size: |
1226 | if (error_ptr) |
1227 | error_ptr->SetErrorString("Unimplemented opcode: DW_OP_xderef_size."); |
1228 | return false; |
1229 | // OPCODE: DW_OP_xderef |
1230 | // OPERANDS: none |
1231 | // DESCRIPTION: Provides an extended dereference mechanism. The entry at |
1232 | // the top of the stack is treated as an address. The second stack entry is |
1233 | // treated as an "address space identifier" for those architectures that |
1234 | // support multiple address spaces. The top two stack elements are popped, |
1235 | // a data item is retrieved through an implementation-defined address |
1236 | // calculation and pushed as the new stack top. The size of the data |
1237 | // retrieved from the dereferenced address is the size of an address on the |
1238 | // target machine. |
1239 | case DW_OP_xderef: |
1240 | if (error_ptr) |
1241 | error_ptr->SetErrorString("Unimplemented opcode: DW_OP_xderef."); |
1242 | return false; |
1243 | |
1244 | // All DW_OP_constXXX opcodes have a single operand as noted below: |
1245 | // |
1246 | // Opcode Operand 1 |
1247 | // DW_OP_const1u 1-byte unsigned integer constant |
1248 | // DW_OP_const1s 1-byte signed integer constant |
1249 | // DW_OP_const2u 2-byte unsigned integer constant |
1250 | // DW_OP_const2s 2-byte signed integer constant |
1251 | // DW_OP_const4u 4-byte unsigned integer constant |
1252 | // DW_OP_const4s 4-byte signed integer constant |
1253 | // DW_OP_const8u 8-byte unsigned integer constant |
1254 | // DW_OP_const8s 8-byte signed integer constant |
1255 | // DW_OP_constu unsigned LEB128 integer constant |
1256 | // DW_OP_consts signed LEB128 integer constant |
1257 | case DW_OP_const1u: |
1258 | stack.push_back(to_generic(opcodes.GetU8(&offset))); |
1259 | break; |
1260 | case DW_OP_const1s: |
1261 | stack.push_back(to_generic((int8_t)opcodes.GetU8(&offset))); |
1262 | break; |
1263 | case DW_OP_const2u: |
1264 | stack.push_back(to_generic(opcodes.GetU16(&offset))); |
1265 | break; |
1266 | case DW_OP_const2s: |
1267 | stack.push_back(to_generic((int16_t)opcodes.GetU16(&offset))); |
1268 | break; |
1269 | case DW_OP_const4u: |
1270 | stack.push_back(to_generic(opcodes.GetU32(&offset))); |
1271 | break; |
1272 | case DW_OP_const4s: |
1273 | stack.push_back(to_generic((int32_t)opcodes.GetU32(&offset))); |
1274 | break; |
1275 | case DW_OP_const8u: |
1276 | stack.push_back(to_generic(opcodes.GetU64(&offset))); |
1277 | break; |
1278 | case DW_OP_const8s: |
1279 | stack.push_back(to_generic((int64_t)opcodes.GetU64(&offset))); |
1280 | break; |
1281 | // These should also use to_generic, but we can't do that due to a |
1282 | // producer-side bug in llvm. See llvm.org/pr48087. |
1283 | case DW_OP_constu: |
1284 | stack.push_back(Scalar(opcodes.GetULEB128(&offset))); |
1285 | break; |
1286 | case DW_OP_consts: |
1287 | stack.push_back(Scalar(opcodes.GetSLEB128(&offset))); |
1288 | break; |
1289 | |
1290 | // OPCODE: DW_OP_dup |
1291 | // OPERANDS: none |
1292 | // DESCRIPTION: duplicates the value at the top of the stack |
1293 | case DW_OP_dup: |
1294 | if (stack.empty()) { |
1295 | if (error_ptr) |
1296 | error_ptr->SetErrorString("Expression stack empty for DW_OP_dup."); |
1297 | return false; |
1298 | } else |
1299 | stack.push_back(stack.back()); |
1300 | break; |
1301 | |
1302 | // OPCODE: DW_OP_drop |
1303 | // OPERANDS: none |
1304 | // DESCRIPTION: pops the value at the top of the stack |
1305 | case DW_OP_drop: |
1306 | if (stack.empty()) { |
1307 | if (error_ptr) |
1308 | error_ptr->SetErrorString("Expression stack empty for DW_OP_drop."); |
1309 | return false; |
1310 | } else |
1311 | stack.pop_back(); |
1312 | break; |
1313 | |
1314 | // OPCODE: DW_OP_over |
1315 | // OPERANDS: none |
1316 | // DESCRIPTION: Duplicates the entry currently second in the stack at |
1317 | // the top of the stack. |
1318 | case DW_OP_over: |
1319 | if (stack.size() < 2) { |
1320 | if (error_ptr) |
1321 | error_ptr->SetErrorString( |
1322 | "Expression stack needs at least 2 items for DW_OP_over."); |
1323 | return false; |
1324 | } else |
1325 | stack.push_back(stack[stack.size() - 2]); |
1326 | break; |
1327 | |
1328 | // OPCODE: DW_OP_pick |
1329 | // OPERANDS: uint8_t index into the current stack |
1330 | // DESCRIPTION: The stack entry with the specified index (0 through 255, |
1331 | // inclusive) is pushed on the stack |
1332 | case DW_OP_pick: { |
1333 | uint8_t pick_idx = opcodes.GetU8(&offset); |
1334 | if (pick_idx < stack.size()) |
1335 | stack.push_back(stack[stack.size() - 1 - pick_idx]); |
1336 | else { |
1337 | if (error_ptr) |
1338 | error_ptr->SetErrorStringWithFormat( |
1339 | "Index %u out of range for DW_OP_pick.\n", pick_idx); |
1340 | return false; |
1341 | } |
1342 | } break; |
1343 | |
1344 | // OPCODE: DW_OP_swap |
1345 | // OPERANDS: none |
1346 | // DESCRIPTION: swaps the top two stack entries. The entry at the top |
1347 | // of the stack becomes the second stack entry, and the second entry |
1348 | // becomes the top of the stack |
1349 | case DW_OP_swap: |
1350 | if (stack.size() < 2) { |
1351 | if (error_ptr) |
1352 | error_ptr->SetErrorString( |
1353 | "Expression stack needs at least 2 items for DW_OP_swap."); |
1354 | return false; |
1355 | } else { |
1356 | tmp = stack.back(); |
1357 | stack.back() = stack[stack.size() - 2]; |
1358 | stack[stack.size() - 2] = tmp; |
1359 | } |
1360 | break; |
1361 | |
1362 | // OPCODE: DW_OP_rot |
1363 | // OPERANDS: none |
1364 | // DESCRIPTION: Rotates the first three stack entries. The entry at |
1365 | // the top of the stack becomes the third stack entry, the second entry |
1366 | // becomes the top of the stack, and the third entry becomes the second |
1367 | // entry. |
1368 | case DW_OP_rot: |
1369 | if (stack.size() < 3) { |
1370 | if (error_ptr) |
1371 | error_ptr->SetErrorString( |
1372 | "Expression stack needs at least 3 items for DW_OP_rot."); |
1373 | return false; |
1374 | } else { |
1375 | size_t last_idx = stack.size() - 1; |
1376 | Value old_top = stack[last_idx]; |
1377 | stack[last_idx] = stack[last_idx - 1]; |
1378 | stack[last_idx - 1] = stack[last_idx - 2]; |
1379 | stack[last_idx - 2] = old_top; |
1380 | } |
1381 | break; |
1382 | |
1383 | // OPCODE: DW_OP_abs |
1384 | // OPERANDS: none |
1385 | // DESCRIPTION: pops the top stack entry, interprets it as a signed |
1386 | // value and pushes its absolute value. If the absolute value can not be |
1387 | // represented, the result is undefined. |
1388 | case DW_OP_abs: |
1389 | if (stack.empty()) { |
1390 | if (error_ptr) |
1391 | error_ptr->SetErrorString( |
1392 | "Expression stack needs at least 1 item for DW_OP_abs."); |
1393 | return false; |
1394 | } else if (!stack.back().ResolveValue(exe_ctx).AbsoluteValue()) { |
1395 | if (error_ptr) |
1396 | error_ptr->SetErrorString( |
1397 | "Failed to take the absolute value of the first stack item."); |
1398 | return false; |
1399 | } |
1400 | break; |
1401 | |
1402 | // OPCODE: DW_OP_and |
1403 | // OPERANDS: none |
1404 | // DESCRIPTION: pops the top two stack values, performs a bitwise and |
1405 | // operation on the two, and pushes the result. |
1406 | case DW_OP_and: |
1407 | if (stack.size() < 2) { |
1408 | if (error_ptr) |
1409 | error_ptr->SetErrorString( |
1410 | "Expression stack needs at least 2 items for DW_OP_and."); |
1411 | return false; |
1412 | } else { |
1413 | tmp = stack.back(); |
1414 | stack.pop_back(); |
1415 | stack.back().ResolveValue(exe_ctx) = |
1416 | stack.back().ResolveValue(exe_ctx) & tmp.ResolveValue(exe_ctx); |
1417 | } |
1418 | break; |
1419 | |
1420 | // OPCODE: DW_OP_div |
1421 | // OPERANDS: none |
1422 | // DESCRIPTION: pops the top two stack values, divides the former second |
1423 | // entry by the former top of the stack using signed division, and pushes |
1424 | // the result. |
1425 | case DW_OP_div: |
1426 | if (stack.size() < 2) { |
1427 | if (error_ptr) |
1428 | error_ptr->SetErrorString( |
1429 | "Expression stack needs at least 2 items for DW_OP_div."); |
1430 | return false; |
1431 | } else { |
1432 | tmp = stack.back(); |
1433 | if (tmp.ResolveValue(exe_ctx).IsZero()) { |
1434 | if (error_ptr) |
1435 | error_ptr->SetErrorString("Divide by zero."); |
1436 | return false; |
1437 | } else { |
1438 | stack.pop_back(); |
1439 | stack.back() = |
1440 | stack.back().ResolveValue(exe_ctx) / tmp.ResolveValue(exe_ctx); |
1441 | if (!stack.back().ResolveValue(exe_ctx).IsValid()) { |
1442 | if (error_ptr) |
1443 | error_ptr->SetErrorString("Divide failed."); |
1444 | return false; |
1445 | } |
1446 | } |
1447 | } |
1448 | break; |
1449 | |
1450 | // OPCODE: DW_OP_minus |
1451 | // OPERANDS: none |
1452 | // DESCRIPTION: pops the top two stack values, subtracts the former top |
1453 | // of the stack from the former second entry, and pushes the result. |
1454 | case DW_OP_minus: |
1455 | if (stack.size() < 2) { |
1456 | if (error_ptr) |
1457 | error_ptr->SetErrorString( |
1458 | "Expression stack needs at least 2 items for DW_OP_minus."); |
1459 | return false; |
1460 | } else { |
1461 | tmp = stack.back(); |
1462 | stack.pop_back(); |
1463 | stack.back().ResolveValue(exe_ctx) = |
1464 | stack.back().ResolveValue(exe_ctx) - tmp.ResolveValue(exe_ctx); |
1465 | } |
1466 | break; |
1467 | |
1468 | // OPCODE: DW_OP_mod |
1469 | // OPERANDS: none |
1470 | // DESCRIPTION: pops the top two stack values and pushes the result of |
1471 | // the calculation: former second stack entry modulo the former top of the |
1472 | // stack. |
1473 | case DW_OP_mod: |
1474 | if (stack.size() < 2) { |
1475 | if (error_ptr) |
1476 | error_ptr->SetErrorString( |
1477 | "Expression stack needs at least 2 items for DW_OP_mod."); |
1478 | return false; |
1479 | } else { |
1480 | tmp = stack.back(); |
1481 | stack.pop_back(); |
1482 | stack.back().ResolveValue(exe_ctx) = |
1483 | stack.back().ResolveValue(exe_ctx) % tmp.ResolveValue(exe_ctx); |
1484 | } |
1485 | break; |
1486 | |
1487 | // OPCODE: DW_OP_mul |
1488 | // OPERANDS: none |
1489 | // DESCRIPTION: pops the top two stack entries, multiplies them |
1490 | // together, and pushes the result. |
1491 | case DW_OP_mul: |
1492 | if (stack.size() < 2) { |
1493 | if (error_ptr) |
1494 | error_ptr->SetErrorString( |
1495 | "Expression stack needs at least 2 items for DW_OP_mul."); |
1496 | return false; |
1497 | } else { |
1498 | tmp = stack.back(); |
1499 | stack.pop_back(); |
1500 | stack.back().ResolveValue(exe_ctx) = |
1501 | stack.back().ResolveValue(exe_ctx) * tmp.ResolveValue(exe_ctx); |
1502 | } |
1503 | break; |
1504 | |
1505 | // OPCODE: DW_OP_neg |
1506 | // OPERANDS: none |
1507 | // DESCRIPTION: pops the top stack entry, and pushes its negation. |
1508 | case DW_OP_neg: |
1509 | if (stack.empty()) { |
1510 | if (error_ptr) |
1511 | error_ptr->SetErrorString( |
1512 | "Expression stack needs at least 1 item for DW_OP_neg."); |
1513 | return false; |
1514 | } else { |
1515 | if (!stack.back().ResolveValue(exe_ctx).UnaryNegate()) { |
1516 | if (error_ptr) |
1517 | error_ptr->SetErrorString("Unary negate failed."); |
1518 | return false; |
1519 | } |
1520 | } |
1521 | break; |
1522 | |
1523 | // OPCODE: DW_OP_not |
1524 | // OPERANDS: none |
1525 | // DESCRIPTION: pops the top stack entry, and pushes its bitwise |
1526 | // complement |
1527 | case DW_OP_not: |
1528 | if (stack.empty()) { |
1529 | if (error_ptr) |
1530 | error_ptr->SetErrorString( |
1531 | "Expression stack needs at least 1 item for DW_OP_not."); |
1532 | return false; |
1533 | } else { |
1534 | if (!stack.back().ResolveValue(exe_ctx).OnesComplement()) { |
1535 | if (error_ptr) |
1536 | error_ptr->SetErrorString("Logical NOT failed."); |
1537 | return false; |
1538 | } |
1539 | } |
1540 | break; |
1541 | |
1542 | // OPCODE: DW_OP_or |
1543 | // OPERANDS: none |
1544 | // DESCRIPTION: pops the top two stack entries, performs a bitwise or |
1545 | // operation on the two, and pushes the result. |
1546 | case DW_OP_or: |
1547 | if (stack.size() < 2) { |
1548 | if (error_ptr) |
1549 | error_ptr->SetErrorString( |
1550 | "Expression stack needs at least 2 items for DW_OP_or."); |
1551 | return false; |
1552 | } else { |
1553 | tmp = stack.back(); |
1554 | stack.pop_back(); |
1555 | stack.back().ResolveValue(exe_ctx) = |
1556 | stack.back().ResolveValue(exe_ctx) | tmp.ResolveValue(exe_ctx); |
1557 | } |
1558 | break; |
1559 | |
1560 | // OPCODE: DW_OP_plus |
1561 | // OPERANDS: none |
1562 | // DESCRIPTION: pops the top two stack entries, adds them together, and |
1563 | // pushes the result. |
1564 | case DW_OP_plus: |
1565 | if (stack.size() < 2) { |
1566 | if (error_ptr) |
1567 | error_ptr->SetErrorString( |
1568 | "Expression stack needs at least 2 items for DW_OP_plus."); |
1569 | return false; |
1570 | } else { |
1571 | tmp = stack.back(); |
1572 | stack.pop_back(); |
1573 | stack.back().GetScalar() += tmp.GetScalar(); |
1574 | } |
1575 | break; |
1576 | |
1577 | // OPCODE: DW_OP_plus_uconst |
1578 | // OPERANDS: none |
1579 | // DESCRIPTION: pops the top stack entry, adds it to the unsigned LEB128 |
1580 | // constant operand and pushes the result. |
1581 | case DW_OP_plus_uconst: |
1582 | if (stack.empty()) { |
1583 | if (error_ptr) |
1584 | error_ptr->SetErrorString( |
1585 | "Expression stack needs at least 1 item for DW_OP_plus_uconst."); |
1586 | return false; |
1587 | } else { |
1588 | const uint64_t uconst_value = opcodes.GetULEB128(&offset); |
1589 | // Implicit conversion from a UINT to a Scalar... |
1590 | stack.back().GetScalar() += uconst_value; |
1591 | if (!stack.back().GetScalar().IsValid()) { |
1592 | if (error_ptr) |
1593 | error_ptr->SetErrorString("DW_OP_plus_uconst failed."); |
1594 | return false; |
1595 | } |
1596 | } |
1597 | break; |
1598 | |
1599 | // OPCODE: DW_OP_shl |
1600 | // OPERANDS: none |
1601 | // DESCRIPTION: pops the top two stack entries, shifts the former |
1602 | // second entry left by the number of bits specified by the former top of |
1603 | // the stack, and pushes the result. |
1604 | case DW_OP_shl: |
1605 | if (stack.size() < 2) { |
1606 | if (error_ptr) |
1607 | error_ptr->SetErrorString( |
1608 | "Expression stack needs at least 2 items for DW_OP_shl."); |
1609 | return false; |
1610 | } else { |
1611 | tmp = stack.back(); |
1612 | stack.pop_back(); |
1613 | stack.back().ResolveValue(exe_ctx) <<= tmp.ResolveValue(exe_ctx); |
1614 | } |
1615 | break; |
1616 | |
1617 | // OPCODE: DW_OP_shr |
1618 | // OPERANDS: none |
1619 | // DESCRIPTION: pops the top two stack entries, shifts the former second |
1620 | // entry right logically (filling with zero bits) by the number of bits |
1621 | // specified by the former top of the stack, and pushes the result. |
1622 | case DW_OP_shr: |
1623 | if (stack.size() < 2) { |
1624 | if (error_ptr) |
1625 | error_ptr->SetErrorString( |
1626 | "Expression stack needs at least 2 items for DW_OP_shr."); |
1627 | return false; |
1628 | } else { |
1629 | tmp = stack.back(); |
1630 | stack.pop_back(); |
1631 | if (!stack.back().ResolveValue(exe_ctx).ShiftRightLogical( |
1632 | tmp.ResolveValue(exe_ctx))) { |
1633 | if (error_ptr) |
1634 | error_ptr->SetErrorString("DW_OP_shr failed."); |
1635 | return false; |
1636 | } |
1637 | } |
1638 | break; |
1639 | |
1640 | // OPCODE: DW_OP_shra |
1641 | // OPERANDS: none |
1642 | // DESCRIPTION: pops the top two stack entries, shifts the former second |
1643 | // entry right arithmetically (divide the magnitude by 2, keep the same |
1644 | // sign for the result) by the number of bits specified by the former top |
1645 | // of the stack, and pushes the result. |
1646 | case DW_OP_shra: |
1647 | if (stack.size() < 2) { |
1648 | if (error_ptr) |
1649 | error_ptr->SetErrorString( |
1650 | "Expression stack needs at least 2 items for DW_OP_shra."); |
1651 | return false; |
1652 | } else { |
1653 | tmp = stack.back(); |
1654 | stack.pop_back(); |
1655 | stack.back().ResolveValue(exe_ctx) >>= tmp.ResolveValue(exe_ctx); |
1656 | } |
1657 | break; |
1658 | |
1659 | // OPCODE: DW_OP_xor |
1660 | // OPERANDS: none |
1661 | // DESCRIPTION: pops the top two stack entries, performs the bitwise |
1662 | // exclusive-or operation on the two, and pushes the result. |
1663 | case DW_OP_xor: |
1664 | if (stack.size() < 2) { |
1665 | if (error_ptr) |
1666 | error_ptr->SetErrorString( |
1667 | "Expression stack needs at least 2 items for DW_OP_xor."); |
1668 | return false; |
1669 | } else { |
1670 | tmp = stack.back(); |
1671 | stack.pop_back(); |
1672 | stack.back().ResolveValue(exe_ctx) = |
1673 | stack.back().ResolveValue(exe_ctx) ^ tmp.ResolveValue(exe_ctx); |
1674 | } |
1675 | break; |
1676 | |
1677 | // OPCODE: DW_OP_skip |
1678 | // OPERANDS: int16_t |
1679 | // DESCRIPTION: An unconditional branch. Its single operand is a 2-byte |
1680 | // signed integer constant. The 2-byte constant is the number of bytes of |
1681 | // the DWARF expression to skip forward or backward from the current |
1682 | // operation, beginning after the 2-byte constant. |
1683 | case DW_OP_skip: { |
1684 | int16_t skip_offset = (int16_t)opcodes.GetU16(&offset); |
1685 | lldb::offset_t new_offset = offset + skip_offset; |
1686 | // New offset can point at the end of the data, in this case we should |
1687 | // terminate the DWARF expression evaluation (will happen in the loop |
1688 | // condition). |
1689 | if (new_offset <= opcodes.GetByteSize()) |
1690 | offset = new_offset; |
1691 | else { |
1692 | if (error_ptr) |
1693 | error_ptr->SetErrorStringWithFormatv( |
1694 | "Invalid opcode offset in DW_OP_skip: {0}+({1}) > {2}", offset, |
1695 | skip_offset, opcodes.GetByteSize()); |
1696 | return false; |
1697 | } |
1698 | } break; |
1699 | |
1700 | // OPCODE: DW_OP_bra |
1701 | // OPERANDS: int16_t |
1702 | // DESCRIPTION: A conditional branch. Its single operand is a 2-byte |
1703 | // signed integer constant. This operation pops the top of stack. If the |
1704 | // value popped is not the constant 0, the 2-byte constant operand is the |
1705 | // number of bytes of the DWARF expression to skip forward or backward from |
1706 | // the current operation, beginning after the 2-byte constant. |
1707 | case DW_OP_bra: |
1708 | if (stack.empty()) { |
1709 | if (error_ptr) |
1710 | error_ptr->SetErrorString( |
1711 | "Expression stack needs at least 1 item for DW_OP_bra."); |
1712 | return false; |
1713 | } else { |
1714 | tmp = stack.back(); |
1715 | stack.pop_back(); |
1716 | int16_t bra_offset = (int16_t)opcodes.GetU16(&offset); |
1717 | Scalar zero(0); |
1718 | if (tmp.ResolveValue(exe_ctx) != zero) { |
1719 | lldb::offset_t new_offset = offset + bra_offset; |
1720 | // New offset can point at the end of the data, in this case we should |
1721 | // terminate the DWARF expression evaluation (will happen in the loop |
1722 | // condition). |
1723 | if (new_offset <= opcodes.GetByteSize()) |
1724 | offset = new_offset; |
1725 | else { |
1726 | if (error_ptr) |
1727 | error_ptr->SetErrorStringWithFormatv( |
1728 | "Invalid opcode offset in DW_OP_bra: {0}+({1}) > {2}", offset, |
1729 | bra_offset, opcodes.GetByteSize()); |
1730 | return false; |
1731 | } |
1732 | } |
1733 | } |
1734 | break; |
1735 | |
1736 | // OPCODE: DW_OP_eq |
1737 | // OPERANDS: none |
1738 | // DESCRIPTION: pops the top two stack values, compares using the |
1739 | // equals (==) operator. |
1740 | // STACK RESULT: push the constant value 1 onto the stack if the result |
1741 | // of the operation is true or the constant value 0 if the result of the |
1742 | // operation is false. |
1743 | case DW_OP_eq: |
1744 | if (stack.size() < 2) { |
1745 | if (error_ptr) |
1746 | error_ptr->SetErrorString( |
1747 | "Expression stack needs at least 2 items for DW_OP_eq."); |
1748 | return false; |
1749 | } else { |
1750 | tmp = stack.back(); |
1751 | stack.pop_back(); |
1752 | stack.back().ResolveValue(exe_ctx) = |
1753 | stack.back().ResolveValue(exe_ctx) == tmp.ResolveValue(exe_ctx); |
1754 | } |
1755 | break; |
1756 | |
1757 | // OPCODE: DW_OP_ge |
1758 | // OPERANDS: none |
1759 | // DESCRIPTION: pops the top two stack values, compares using the |
1760 | // greater than or equal to (>=) operator. |
1761 | // STACK RESULT: push the constant value 1 onto the stack if the result |
1762 | // of the operation is true or the constant value 0 if the result of the |
1763 | // operation is false. |
1764 | case DW_OP_ge: |
1765 | if (stack.size() < 2) { |
1766 | if (error_ptr) |
1767 | error_ptr->SetErrorString( |
1768 | "Expression stack needs at least 2 items for DW_OP_ge."); |
1769 | return false; |
1770 | } else { |
1771 | tmp = stack.back(); |
1772 | stack.pop_back(); |
1773 | stack.back().ResolveValue(exe_ctx) = |
1774 | stack.back().ResolveValue(exe_ctx) >= tmp.ResolveValue(exe_ctx); |
1775 | } |
1776 | break; |
1777 | |
1778 | // OPCODE: DW_OP_gt |
1779 | // OPERANDS: none |
1780 | // DESCRIPTION: pops the top two stack values, compares using the |
1781 | // greater than (>) operator. |
1782 | // STACK RESULT: push the constant value 1 onto the stack if the result |
1783 | // of the operation is true or the constant value 0 if the result of the |
1784 | // operation is false. |
1785 | case DW_OP_gt: |
1786 | if (stack.size() < 2) { |
1787 | if (error_ptr) |
1788 | error_ptr->SetErrorString( |
1789 | "Expression stack needs at least 2 items for DW_OP_gt."); |
1790 | return false; |
1791 | } else { |
1792 | tmp = stack.back(); |
1793 | stack.pop_back(); |
1794 | stack.back().ResolveValue(exe_ctx) = |
1795 | stack.back().ResolveValue(exe_ctx) > tmp.ResolveValue(exe_ctx); |
1796 | } |
1797 | break; |
1798 | |
1799 | // OPCODE: DW_OP_le |
1800 | // OPERANDS: none |
1801 | // DESCRIPTION: pops the top two stack values, compares using the |
1802 | // less than or equal to (<=) operator. |
1803 | // STACK RESULT: push the constant value 1 onto the stack if the result |
1804 | // of the operation is true or the constant value 0 if the result of the |
1805 | // operation is false. |
1806 | case DW_OP_le: |
1807 | if (stack.size() < 2) { |
1808 | if (error_ptr) |
1809 | error_ptr->SetErrorString( |
1810 | "Expression stack needs at least 2 items for DW_OP_le."); |
1811 | return false; |
1812 | } else { |
1813 | tmp = stack.back(); |
1814 | stack.pop_back(); |
1815 | stack.back().ResolveValue(exe_ctx) = |
1816 | stack.back().ResolveValue(exe_ctx) <= tmp.ResolveValue(exe_ctx); |
1817 | } |
1818 | break; |
1819 | |
1820 | // OPCODE: DW_OP_lt |
1821 | // OPERANDS: none |
1822 | // DESCRIPTION: pops the top two stack values, compares using the |
1823 | // less than (<) operator. |
1824 | // STACK RESULT: push the constant value 1 onto the stack if the result |
1825 | // of the operation is true or the constant value 0 if the result of the |
1826 | // operation is false. |
1827 | case DW_OP_lt: |
1828 | if (stack.size() < 2) { |
1829 | if (error_ptr) |
1830 | error_ptr->SetErrorString( |
1831 | "Expression stack needs at least 2 items for DW_OP_lt."); |
1832 | return false; |
1833 | } else { |
1834 | tmp = stack.back(); |
1835 | stack.pop_back(); |
1836 | stack.back().ResolveValue(exe_ctx) = |
1837 | stack.back().ResolveValue(exe_ctx) < tmp.ResolveValue(exe_ctx); |
1838 | } |
1839 | break; |
1840 | |
1841 | // OPCODE: DW_OP_ne |
1842 | // OPERANDS: none |
1843 | // DESCRIPTION: pops the top two stack values, compares using the |
1844 | // not equal (!=) operator. |
1845 | // STACK RESULT: push the constant value 1 onto the stack if the result |
1846 | // of the operation is true or the constant value 0 if the result of the |
1847 | // operation is false. |
1848 | case DW_OP_ne: |
1849 | if (stack.size() < 2) { |
1850 | if (error_ptr) |
1851 | error_ptr->SetErrorString( |
1852 | "Expression stack needs at least 2 items for DW_OP_ne."); |
1853 | return false; |
1854 | } else { |
1855 | tmp = stack.back(); |
1856 | stack.pop_back(); |
1857 | stack.back().ResolveValue(exe_ctx) = |
1858 | stack.back().ResolveValue(exe_ctx) != tmp.ResolveValue(exe_ctx); |
1859 | } |
1860 | break; |
1861 | |
1862 | // OPCODE: DW_OP_litn |
1863 | // OPERANDS: none |
1864 | // DESCRIPTION: encode the unsigned literal values from 0 through 31. |
1865 | // STACK RESULT: push the unsigned literal constant value onto the top |
1866 | // of the stack. |
1867 | case DW_OP_lit0: |
1868 | case DW_OP_lit1: |
1869 | case DW_OP_lit2: |
1870 | case DW_OP_lit3: |
1871 | case DW_OP_lit4: |
1872 | case DW_OP_lit5: |
1873 | case DW_OP_lit6: |
1874 | case DW_OP_lit7: |
1875 | case DW_OP_lit8: |
1876 | case DW_OP_lit9: |
1877 | case DW_OP_lit10: |
1878 | case DW_OP_lit11: |
1879 | case DW_OP_lit12: |
1880 | case DW_OP_lit13: |
1881 | case DW_OP_lit14: |
1882 | case DW_OP_lit15: |
1883 | case DW_OP_lit16: |
1884 | case DW_OP_lit17: |
1885 | case DW_OP_lit18: |
1886 | case DW_OP_lit19: |
1887 | case DW_OP_lit20: |
1888 | case DW_OP_lit21: |
1889 | case DW_OP_lit22: |
1890 | case DW_OP_lit23: |
1891 | case DW_OP_lit24: |
1892 | case DW_OP_lit25: |
1893 | case DW_OP_lit26: |
1894 | case DW_OP_lit27: |
1895 | case DW_OP_lit28: |
1896 | case DW_OP_lit29: |
1897 | case DW_OP_lit30: |
1898 | case DW_OP_lit31: |
1899 | stack.push_back(to_generic(op - DW_OP_lit0)); |
1900 | break; |
1901 | |
1902 | // OPCODE: DW_OP_regN |
1903 | // OPERANDS: none |
1904 | // DESCRIPTION: Push the value in register n on the top of the stack. |
1905 | case DW_OP_reg0: |
1906 | case DW_OP_reg1: |
1907 | case DW_OP_reg2: |
1908 | case DW_OP_reg3: |
1909 | case DW_OP_reg4: |
1910 | case DW_OP_reg5: |
1911 | case DW_OP_reg6: |
1912 | case DW_OP_reg7: |
1913 | case DW_OP_reg8: |
1914 | case DW_OP_reg9: |
1915 | case DW_OP_reg10: |
1916 | case DW_OP_reg11: |
1917 | case DW_OP_reg12: |
1918 | case DW_OP_reg13: |
1919 | case DW_OP_reg14: |
1920 | case DW_OP_reg15: |
1921 | case DW_OP_reg16: |
1922 | case DW_OP_reg17: |
1923 | case DW_OP_reg18: |
1924 | case DW_OP_reg19: |
1925 | case DW_OP_reg20: |
1926 | case DW_OP_reg21: |
1927 | case DW_OP_reg22: |
1928 | case DW_OP_reg23: |
1929 | case DW_OP_reg24: |
1930 | case DW_OP_reg25: |
1931 | case DW_OP_reg26: |
1932 | case DW_OP_reg27: |
1933 | case DW_OP_reg28: |
1934 | case DW_OP_reg29: |
1935 | case DW_OP_reg30: |
1936 | case DW_OP_reg31: { |
1937 | dwarf4_location_description_kind = Register; |
1938 | reg_num = op - DW_OP_reg0; |
1939 | |
1940 | if (ReadRegisterValueAsScalar(reg_ctx, reg_kind, reg_num, error_ptr, tmp)) |
1941 | stack.push_back(tmp); |
1942 | else |
1943 | return false; |
1944 | } break; |
1945 | // OPCODE: DW_OP_regx |
1946 | // OPERANDS: |
1947 | // ULEB128 literal operand that encodes the register. |
1948 | // DESCRIPTION: Push the value in register on the top of the stack. |
1949 | case DW_OP_regx: { |
1950 | dwarf4_location_description_kind = Register; |
1951 | reg_num = opcodes.GetULEB128(&offset); |
1952 | if (ReadRegisterValueAsScalar(reg_ctx, reg_kind, reg_num, error_ptr, tmp)) |
1953 | stack.push_back(tmp); |
1954 | else |
1955 | return false; |
1956 | } break; |
1957 | |
1958 | // OPCODE: DW_OP_bregN |
1959 | // OPERANDS: |
1960 | // SLEB128 offset from register N |
1961 | // DESCRIPTION: Value is in memory at the address specified by register |
1962 | // N plus an offset. |
1963 | case DW_OP_breg0: |
1964 | case DW_OP_breg1: |
1965 | case DW_OP_breg2: |
1966 | case DW_OP_breg3: |
1967 | case DW_OP_breg4: |
1968 | case DW_OP_breg5: |
1969 | case DW_OP_breg6: |
1970 | case DW_OP_breg7: |
1971 | case DW_OP_breg8: |
1972 | case DW_OP_breg9: |
1973 | case DW_OP_breg10: |
1974 | case DW_OP_breg11: |
1975 | case DW_OP_breg12: |
1976 | case DW_OP_breg13: |
1977 | case DW_OP_breg14: |
1978 | case DW_OP_breg15: |
1979 | case DW_OP_breg16: |
1980 | case DW_OP_breg17: |
1981 | case DW_OP_breg18: |
1982 | case DW_OP_breg19: |
1983 | case DW_OP_breg20: |
1984 | case DW_OP_breg21: |
1985 | case DW_OP_breg22: |
1986 | case DW_OP_breg23: |
1987 | case DW_OP_breg24: |
1988 | case DW_OP_breg25: |
1989 | case DW_OP_breg26: |
1990 | case DW_OP_breg27: |
1991 | case DW_OP_breg28: |
1992 | case DW_OP_breg29: |
1993 | case DW_OP_breg30: |
1994 | case DW_OP_breg31: { |
1995 | reg_num = op - DW_OP_breg0; |
1996 | |
1997 | if (ReadRegisterValueAsScalar(reg_ctx, reg_kind, reg_num, error_ptr, |
1998 | tmp)) { |
1999 | int64_t breg_offset = opcodes.GetSLEB128(&offset); |
2000 | tmp.ResolveValue(exe_ctx) += (uint64_t)breg_offset; |
2001 | tmp.ClearContext(); |
2002 | stack.push_back(tmp); |
2003 | stack.back().SetValueType(Value::ValueType::LoadAddress); |
2004 | } else |
2005 | return false; |
2006 | } break; |
2007 | // OPCODE: DW_OP_bregx |
2008 | // OPERANDS: 2 |
2009 | // ULEB128 literal operand that encodes the register. |
2010 | // SLEB128 offset from register N |
2011 | // DESCRIPTION: Value is in memory at the address specified by register |
2012 | // N plus an offset. |
2013 | case DW_OP_bregx: { |
2014 | reg_num = opcodes.GetULEB128(&offset); |
2015 | |
2016 | if (ReadRegisterValueAsScalar(reg_ctx, reg_kind, reg_num, error_ptr, |
2017 | tmp)) { |
2018 | int64_t breg_offset = opcodes.GetSLEB128(&offset); |
2019 | tmp.ResolveValue(exe_ctx) += (uint64_t)breg_offset; |
2020 | tmp.ClearContext(); |
2021 | stack.push_back(tmp); |
2022 | stack.back().SetValueType(Value::ValueType::LoadAddress); |
2023 | } else |
2024 | return false; |
2025 | } break; |
2026 | |
2027 | case DW_OP_fbreg: |
2028 | if (exe_ctx) { |
2029 | if (frame) { |
2030 | Scalar value; |
2031 | if (frame->GetFrameBaseValue(value, error_ptr)) { |
2032 | int64_t fbreg_offset = opcodes.GetSLEB128(&offset); |
2033 | value += fbreg_offset; |
2034 | stack.push_back(value); |
2035 | stack.back().SetValueType(Value::ValueType::LoadAddress); |
2036 | } else |
2037 | return false; |
2038 | } else { |
2039 | if (error_ptr) |
2040 | error_ptr->SetErrorString( |
2041 | "Invalid stack frame in context for DW_OP_fbreg opcode."); |
2042 | return false; |
2043 | } |
2044 | } else { |
2045 | if (error_ptr) |
2046 | error_ptr->SetErrorString( |
2047 | "NULL execution context for DW_OP_fbreg.\n"); |
2048 | return false; |
2049 | } |
2050 | |
2051 | break; |
2052 | |
2053 | // OPCODE: DW_OP_nop |
2054 | // OPERANDS: none |
2055 | // DESCRIPTION: A place holder. It has no effect on the location stack |
2056 | // or any of its values. |
2057 | case DW_OP_nop: |
2058 | break; |
2059 | |
2060 | // OPCODE: DW_OP_piece |
2061 | // OPERANDS: 1 |
2062 | // ULEB128: byte size of the piece |
2063 | // DESCRIPTION: The operand describes the size in bytes of the piece of |
2064 | // the object referenced by the DWARF expression whose result is at the top |
2065 | // of the stack. If the piece is located in a register, but does not occupy |
2066 | // the entire register, the placement of the piece within that register is |
2067 | // defined by the ABI. |
2068 | // |
2069 | // Many compilers store a single variable in sets of registers, or store a |
2070 | // variable partially in memory and partially in registers. DW_OP_piece |
2071 | // provides a way of describing how large a part of a variable a particular |
2072 | // DWARF expression refers to. |
2073 | case DW_OP_piece: { |
2074 | LocationDescriptionKind piece_locdesc = dwarf4_location_description_kind; |
2075 | // Reset for the next piece. |
2076 | dwarf4_location_description_kind = Memory; |
2077 | |
2078 | const uint64_t piece_byte_size = opcodes.GetULEB128(&offset); |
2079 | |
2080 | if (piece_byte_size > 0) { |
2081 | Value curr_piece; |
2082 | |
2083 | if (stack.empty()) { |
2084 | UpdateValueTypeFromLocationDescription( |
2085 | log, dwarf_cu, LocationDescriptionKind::Empty); |
2086 | // In a multi-piece expression, this means that the current piece is |
2087 | // not available. Fill with zeros for now by resizing the data and |
2088 | // appending it |
2089 | curr_piece.ResizeData(piece_byte_size); |
2090 | // Note that "0" is not a correct value for the unknown bits. |
2091 | // It would be better to also return a mask of valid bits together |
2092 | // with the expression result, so the debugger can print missing |
2093 | // members as "<optimized out>" or something. |
2094 | ::memset(curr_piece.GetBuffer().GetBytes(), 0, piece_byte_size); |
2095 | pieces.AppendDataToHostBuffer(curr_piece); |
2096 | } else { |
2097 | Status error; |
2098 | // Extract the current piece into "curr_piece" |
2099 | Value curr_piece_source_value(stack.back()); |
2100 | stack.pop_back(); |
2101 | UpdateValueTypeFromLocationDescription(log, dwarf_cu, piece_locdesc, |
2102 | &curr_piece_source_value); |
2103 | |
2104 | const Value::ValueType curr_piece_source_value_type = |
2105 | curr_piece_source_value.GetValueType(); |
2106 | switch (curr_piece_source_value_type) { |
2107 | case Value::ValueType::Invalid: |
2108 | return false; |
2109 | case Value::ValueType::LoadAddress: |
2110 | if (process) { |
2111 | if (curr_piece.ResizeData(piece_byte_size) == piece_byte_size) { |
2112 | lldb::addr_t load_addr = |
2113 | curr_piece_source_value.GetScalar().ULongLong( |
2114 | LLDB_INVALID_ADDRESS(18446744073709551615UL)); |
2115 | if (process->ReadMemory( |
2116 | load_addr, curr_piece.GetBuffer().GetBytes(), |
2117 | piece_byte_size, error) != piece_byte_size) { |
2118 | if (error_ptr) |
2119 | error_ptr->SetErrorStringWithFormat( |
2120 | "failed to read memory DW_OP_piece(%" PRIu64"l" "u" |
2121 | ") from 0x%" PRIx64"l" "x", |
2122 | piece_byte_size, load_addr); |
2123 | return false; |
2124 | } |
2125 | } else { |
2126 | if (error_ptr) |
2127 | error_ptr->SetErrorStringWithFormat( |
2128 | "failed to resize the piece memory buffer for " |
2129 | "DW_OP_piece(%" PRIu64"l" "u" ")", |
2130 | piece_byte_size); |
2131 | return false; |
2132 | } |
2133 | } |
2134 | break; |
2135 | |
2136 | case Value::ValueType::FileAddress: |
2137 | case Value::ValueType::HostAddress: |
2138 | if (error_ptr) { |
2139 | lldb::addr_t addr = curr_piece_source_value.GetScalar().ULongLong( |
2140 | LLDB_INVALID_ADDRESS(18446744073709551615UL)); |
2141 | error_ptr->SetErrorStringWithFormat( |
2142 | "failed to read memory DW_OP_piece(%" PRIu64"l" "u" |
2143 | ") from %s address 0x%" PRIx64"l" "x", |
2144 | piece_byte_size, curr_piece_source_value.GetValueType() == |
2145 | Value::ValueType::FileAddress |
2146 | ? "file" |
2147 | : "host", |
2148 | addr); |
2149 | } |
2150 | return false; |
2151 | |
2152 | case Value::ValueType::Scalar: { |
2153 | uint32_t bit_size = piece_byte_size * 8; |
2154 | uint32_t bit_offset = 0; |
2155 | Scalar &scalar = curr_piece_source_value.GetScalar(); |
2156 | if (!scalar.ExtractBitfield( |
2157 | bit_size, bit_offset)) { |
2158 | if (error_ptr) |
2159 | error_ptr->SetErrorStringWithFormat( |
2160 | "unable to extract %" PRIu64"l" "u" " bytes from a %" PRIu64"l" "u" |
2161 | " byte scalar value.", |
2162 | piece_byte_size, |
2163 | (uint64_t)curr_piece_source_value.GetScalar() |
2164 | .GetByteSize()); |
2165 | return false; |
2166 | } |
2167 | // Create curr_piece with bit_size. By default Scalar |
2168 | // grows to the nearest host integer type. |
2169 | llvm::APInt fail_value(1, 0, false); |
2170 | llvm::APInt ap_int = scalar.UInt128(fail_value); |
2171 | assert(ap_int.getBitWidth() >= bit_size)(static_cast <bool> (ap_int.getBitWidth() >= bit_size ) ? void (0) : __assert_fail ("ap_int.getBitWidth() >= bit_size" , "lldb/source/Expression/DWARFExpression.cpp", 2171, __extension__ __PRETTY_FUNCTION__)); |
2172 | llvm::ArrayRef<uint64_t> buf{ap_int.getRawData(), |
2173 | ap_int.getNumWords()}; |
2174 | curr_piece.GetScalar() = Scalar(llvm::APInt(bit_size, buf)); |
2175 | } break; |
2176 | } |
2177 | |
2178 | // Check if this is the first piece? |
2179 | if (op_piece_offset == 0) { |
2180 | // This is the first piece, we should push it back onto the stack |
2181 | // so subsequent pieces will be able to access this piece and add |
2182 | // to it. |
2183 | if (pieces.AppendDataToHostBuffer(curr_piece) == 0) { |
2184 | if (error_ptr) |
2185 | error_ptr->SetErrorString("failed to append piece data"); |
2186 | return false; |
2187 | } |
2188 | } else { |
2189 | // If this is the second or later piece there should be a value on |
2190 | // the stack. |
2191 | if (pieces.GetBuffer().GetByteSize() != op_piece_offset) { |
2192 | if (error_ptr) |
2193 | error_ptr->SetErrorStringWithFormat( |
2194 | "DW_OP_piece for offset %" PRIu64"l" "u" |
2195 | " but top of stack is of size %" PRIu64"l" "u", |
2196 | op_piece_offset, pieces.GetBuffer().GetByteSize()); |
2197 | return false; |
2198 | } |
2199 | |
2200 | if (pieces.AppendDataToHostBuffer(curr_piece) == 0) { |
2201 | if (error_ptr) |
2202 | error_ptr->SetErrorString("failed to append piece data"); |
2203 | return false; |
2204 | } |
2205 | } |
2206 | } |
2207 | op_piece_offset += piece_byte_size; |
2208 | } |
2209 | } break; |
2210 | |
2211 | case DW_OP_bit_piece: // 0x9d ULEB128 bit size, ULEB128 bit offset (DWARF3); |
2212 | if (stack.size() < 1) { |
2213 | UpdateValueTypeFromLocationDescription(log, dwarf_cu, |
2214 | LocationDescriptionKind::Empty); |
2215 | // Reset for the next piece. |
2216 | dwarf4_location_description_kind = Memory; |
Value stored to 'dwarf4_location_description_kind' is never read | |
2217 | if (error_ptr) |
2218 | error_ptr->SetErrorString( |
2219 | "Expression stack needs at least 1 item for DW_OP_bit_piece."); |
2220 | return false; |
2221 | } else { |
2222 | UpdateValueTypeFromLocationDescription( |
2223 | log, dwarf_cu, dwarf4_location_description_kind, &stack.back()); |
2224 | // Reset for the next piece. |
2225 | dwarf4_location_description_kind = Memory; |
2226 | const uint64_t piece_bit_size = opcodes.GetULEB128(&offset); |
2227 | const uint64_t piece_bit_offset = opcodes.GetULEB128(&offset); |
2228 | switch (stack.back().GetValueType()) { |
2229 | case Value::ValueType::Invalid: |
2230 | return false; |
2231 | case Value::ValueType::Scalar: { |
2232 | if (!stack.back().GetScalar().ExtractBitfield(piece_bit_size, |
2233 | piece_bit_offset)) { |
2234 | if (error_ptr) |
2235 | error_ptr->SetErrorStringWithFormat( |
2236 | "unable to extract %" PRIu64"l" "u" " bit value with %" PRIu64"l" "u" |
2237 | " bit offset from a %" PRIu64"l" "u" " bit scalar value.", |
2238 | piece_bit_size, piece_bit_offset, |
2239 | (uint64_t)(stack.back().GetScalar().GetByteSize() * 8)); |
2240 | return false; |
2241 | } |
2242 | } break; |
2243 | |
2244 | case Value::ValueType::FileAddress: |
2245 | case Value::ValueType::LoadAddress: |
2246 | case Value::ValueType::HostAddress: |
2247 | if (error_ptr) { |
2248 | error_ptr->SetErrorStringWithFormat( |
2249 | "unable to extract DW_OP_bit_piece(bit_size = %" PRIu64"l" "u" |
2250 | ", bit_offset = %" PRIu64"l" "u" ") from an address value.", |
2251 | piece_bit_size, piece_bit_offset); |
2252 | } |
2253 | return false; |
2254 | } |
2255 | } |
2256 | break; |
2257 | |
2258 | // OPCODE: DW_OP_implicit_value |
2259 | // OPERANDS: 2 |
2260 | // ULEB128 size of the value block in bytes |
2261 | // uint8_t* block bytes encoding value in target's memory |
2262 | // representation |
2263 | // DESCRIPTION: Value is immediately stored in block in the debug info with |
2264 | // the memory representation of the target. |
2265 | case DW_OP_implicit_value: { |
2266 | dwarf4_location_description_kind = Implicit; |
2267 | |
2268 | const uint32_t len = opcodes.GetULEB128(&offset); |
2269 | const void *data = opcodes.GetData(&offset, len); |
2270 | |
2271 | if (!data) { |
2272 | LLDB_LOG(log, "Evaluate_DW_OP_implicit_value: could not be read data")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Expression/DWARFExpression.cpp" , __func__, "Evaluate_DW_OP_implicit_value: could not be read data" ); } while (0); |
2273 | LLDB_ERRORF(error_ptr, "Could not evaluate %s.",do { if (error_ptr) { (error_ptr)->SetErrorStringWithFormat (("Could not evaluate %s."), DW_OP_value_to_name(op)); } } while (0); |
2274 | DW_OP_value_to_name(op))do { if (error_ptr) { (error_ptr)->SetErrorStringWithFormat (("Could not evaluate %s."), DW_OP_value_to_name(op)); } } while (0);; |
2275 | return false; |
2276 | } |
2277 | |
2278 | Value result(data, len); |
2279 | stack.push_back(result); |
2280 | break; |
2281 | } |
2282 | |
2283 | case DW_OP_implicit_pointer: { |
2284 | dwarf4_location_description_kind = Implicit; |
2285 | LLDB_ERRORF(error_ptr, "Could not evaluate %s.", DW_OP_value_to_name(op))do { if (error_ptr) { (error_ptr)->SetErrorStringWithFormat (("Could not evaluate %s."), DW_OP_value_to_name(op)); } } while (0);; |
2286 | return false; |
2287 | } |
2288 | |
2289 | // OPCODE: DW_OP_push_object_address |
2290 | // OPERANDS: none |
2291 | // DESCRIPTION: Pushes the address of the object currently being |
2292 | // evaluated as part of evaluation of a user presented expression. This |
2293 | // object may correspond to an independent variable described by its own |
2294 | // DIE or it may be a component of an array, structure, or class whose |
2295 | // address has been dynamically determined by an earlier step during user |
2296 | // expression evaluation. |
2297 | case DW_OP_push_object_address: |
2298 | if (object_address_ptr) |
2299 | stack.push_back(*object_address_ptr); |
2300 | else { |
2301 | if (error_ptr) |
2302 | error_ptr->SetErrorString("DW_OP_push_object_address used without " |
2303 | "specifying an object address"); |
2304 | return false; |
2305 | } |
2306 | break; |
2307 | |
2308 | // OPCODE: DW_OP_call2 |
2309 | // OPERANDS: |
2310 | // uint16_t compile unit relative offset of a DIE |
2311 | // DESCRIPTION: Performs subroutine calls during evaluation |
2312 | // of a DWARF expression. The operand is the 2-byte unsigned offset of a |
2313 | // debugging information entry in the current compilation unit. |
2314 | // |
2315 | // Operand interpretation is exactly like that for DW_FORM_ref2. |
2316 | // |
2317 | // This operation transfers control of DWARF expression evaluation to the |
2318 | // DW_AT_location attribute of the referenced DIE. If there is no such |
2319 | // attribute, then there is no effect. Execution of the DWARF expression of |
2320 | // a DW_AT_location attribute may add to and/or remove from values on the |
2321 | // stack. Execution returns to the point following the call when the end of |
2322 | // the attribute is reached. Values on the stack at the time of the call |
2323 | // may be used as parameters by the called expression and values left on |
2324 | // the stack by the called expression may be used as return values by prior |
2325 | // agreement between the calling and called expressions. |
2326 | case DW_OP_call2: |
2327 | if (error_ptr) |
2328 | error_ptr->SetErrorString("Unimplemented opcode DW_OP_call2."); |
2329 | return false; |
2330 | // OPCODE: DW_OP_call4 |
2331 | // OPERANDS: 1 |
2332 | // uint32_t compile unit relative offset of a DIE |
2333 | // DESCRIPTION: Performs a subroutine call during evaluation of a DWARF |
2334 | // expression. For DW_OP_call4, the operand is a 4-byte unsigned offset of |
2335 | // a debugging information entry in the current compilation unit. |
2336 | // |
2337 | // Operand interpretation DW_OP_call4 is exactly like that for |
2338 | // DW_FORM_ref4. |
2339 | // |
2340 | // This operation transfers control of DWARF expression evaluation to the |
2341 | // DW_AT_location attribute of the referenced DIE. If there is no such |
2342 | // attribute, then there is no effect. Execution of the DWARF expression of |
2343 | // a DW_AT_location attribute may add to and/or remove from values on the |
2344 | // stack. Execution returns to the point following the call when the end of |
2345 | // the attribute is reached. Values on the stack at the time of the call |
2346 | // may be used as parameters by the called expression and values left on |
2347 | // the stack by the called expression may be used as return values by prior |
2348 | // agreement between the calling and called expressions. |
2349 | case DW_OP_call4: |
2350 | if (error_ptr) |
2351 | error_ptr->SetErrorString("Unimplemented opcode DW_OP_call4."); |
2352 | return false; |
2353 | |
2354 | // OPCODE: DW_OP_stack_value |
2355 | // OPERANDS: None |
2356 | // DESCRIPTION: Specifies that the object does not exist in memory but |
2357 | // rather is a constant value. The value from the top of the stack is the |
2358 | // value to be used. This is the actual object value and not the location. |
2359 | case DW_OP_stack_value: |
2360 | dwarf4_location_description_kind = Implicit; |
2361 | if (stack.empty()) { |
2362 | if (error_ptr) |
2363 | error_ptr->SetErrorString( |
2364 | "Expression stack needs at least 1 item for DW_OP_stack_value."); |
2365 | return false; |
2366 | } |
2367 | stack.back().SetValueType(Value::ValueType::Scalar); |
2368 | break; |
2369 | |
2370 | // OPCODE: DW_OP_convert |
2371 | // OPERANDS: 1 |
2372 | // A ULEB128 that is either a DIE offset of a |
2373 | // DW_TAG_base_type or 0 for the generic (pointer-sized) type. |
2374 | // |
2375 | // DESCRIPTION: Pop the top stack element, convert it to a |
2376 | // different type, and push the result. |
2377 | case DW_OP_convert: { |
2378 | if (stack.size() < 1) { |
2379 | if (error_ptr) |
2380 | error_ptr->SetErrorString( |
2381 | "Expression stack needs at least 1 item for DW_OP_convert."); |
2382 | return false; |
2383 | } |
2384 | const uint64_t die_offset = opcodes.GetULEB128(&offset); |
2385 | uint64_t bit_size; |
2386 | bool sign; |
2387 | if (die_offset == 0) { |
2388 | // The generic type has the size of an address on the target |
2389 | // machine and an unspecified signedness. Scalar has no |
2390 | // "unspecified signedness", so we use unsigned types. |
2391 | if (!module_sp) { |
2392 | if (error_ptr) |
2393 | error_ptr->SetErrorString("No module"); |
2394 | return false; |
2395 | } |
2396 | sign = false; |
2397 | bit_size = module_sp->GetArchitecture().GetAddressByteSize() * 8; |
2398 | if (!bit_size) { |
2399 | if (error_ptr) |
2400 | error_ptr->SetErrorString("unspecified architecture"); |
2401 | return false; |
2402 | } |
2403 | } else { |
2404 | // Retrieve the type DIE that the value is being converted to. This |
2405 | // offset is compile unit relative so we need to fix it up. |
2406 | const uint64_t abs_die_offset = die_offset + dwarf_cu->GetOffset(); |
2407 | // FIXME: the constness has annoying ripple effects. |
2408 | DWARFDIE die = const_cast<DWARFUnit *>(dwarf_cu)->GetDIE(abs_die_offset); |
2409 | if (!die) { |
2410 | if (error_ptr) |
2411 | error_ptr->SetErrorString("Cannot resolve DW_OP_convert type DIE"); |
2412 | return false; |
2413 | } |
2414 | uint64_t encoding = |
2415 | die.GetAttributeValueAsUnsigned(DW_AT_encoding, DW_ATE_hi_user); |
2416 | bit_size = die.GetAttributeValueAsUnsigned(DW_AT_byte_size, 0) * 8; |
2417 | if (!bit_size) |
2418 | bit_size = die.GetAttributeValueAsUnsigned(DW_AT_bit_size, 0); |
2419 | if (!bit_size) { |
2420 | if (error_ptr) |
2421 | error_ptr->SetErrorString("Unsupported type size in DW_OP_convert"); |
2422 | return false; |
2423 | } |
2424 | switch (encoding) { |
2425 | case DW_ATE_signed: |
2426 | case DW_ATE_signed_char: |
2427 | sign = true; |
2428 | break; |
2429 | case DW_ATE_unsigned: |
2430 | case DW_ATE_unsigned_char: |
2431 | sign = false; |
2432 | break; |
2433 | default: |
2434 | if (error_ptr) |
2435 | error_ptr->SetErrorString("Unsupported encoding in DW_OP_convert"); |
2436 | return false; |
2437 | } |
2438 | } |
2439 | Scalar &top = stack.back().ResolveValue(exe_ctx); |
2440 | top.TruncOrExtendTo(bit_size, sign); |
2441 | break; |
2442 | } |
2443 | |
2444 | // OPCODE: DW_OP_call_frame_cfa |
2445 | // OPERANDS: None |
2446 | // DESCRIPTION: Specifies a DWARF expression that pushes the value of |
2447 | // the canonical frame address consistent with the call frame information |
2448 | // located in .debug_frame (or in the FDEs of the eh_frame section). |
2449 | case DW_OP_call_frame_cfa: |
2450 | if (frame) { |
2451 | // Note that we don't have to parse FDEs because this DWARF expression |
2452 | // is commonly evaluated with a valid stack frame. |
2453 | StackID id = frame->GetStackID(); |
2454 | addr_t cfa = id.GetCallFrameAddress(); |
2455 | if (cfa != LLDB_INVALID_ADDRESS(18446744073709551615UL)) { |
2456 | stack.push_back(Scalar(cfa)); |
2457 | stack.back().SetValueType(Value::ValueType::LoadAddress); |
2458 | } else if (error_ptr) |
2459 | error_ptr->SetErrorString("Stack frame does not include a canonical " |
2460 | "frame address for DW_OP_call_frame_cfa " |
2461 | "opcode."); |
2462 | } else { |
2463 | if (error_ptr) |
2464 | error_ptr->SetErrorString("Invalid stack frame in context for " |
2465 | "DW_OP_call_frame_cfa opcode."); |
2466 | return false; |
2467 | } |
2468 | break; |
2469 | |
2470 | // OPCODE: DW_OP_form_tls_address (or the old pre-DWARFv3 vendor extension |
2471 | // opcode, DW_OP_GNU_push_tls_address) |
2472 | // OPERANDS: none |
2473 | // DESCRIPTION: Pops a TLS offset from the stack, converts it to |
2474 | // an address in the current thread's thread-local storage block, and |
2475 | // pushes it on the stack. |
2476 | case DW_OP_form_tls_address: |
2477 | case DW_OP_GNU_push_tls_address: { |
2478 | if (stack.size() < 1) { |
2479 | if (error_ptr) { |
2480 | if (op == DW_OP_form_tls_address) |
2481 | error_ptr->SetErrorString( |
2482 | "DW_OP_form_tls_address needs an argument."); |
2483 | else |
2484 | error_ptr->SetErrorString( |
2485 | "DW_OP_GNU_push_tls_address needs an argument."); |
2486 | } |
2487 | return false; |
2488 | } |
2489 | |
2490 | if (!exe_ctx || !module_sp) { |
2491 | if (error_ptr) |
2492 | error_ptr->SetErrorString("No context to evaluate TLS within."); |
2493 | return false; |
2494 | } |
2495 | |
2496 | Thread *thread = exe_ctx->GetThreadPtr(); |
2497 | if (!thread) { |
2498 | if (error_ptr) |
2499 | error_ptr->SetErrorString("No thread to evaluate TLS within."); |
2500 | return false; |
2501 | } |
2502 | |
2503 | // Lookup the TLS block address for this thread and module. |
2504 | const addr_t tls_file_addr = |
2505 | stack.back().GetScalar().ULongLong(LLDB_INVALID_ADDRESS(18446744073709551615UL)); |
2506 | const addr_t tls_load_addr = |
2507 | thread->GetThreadLocalData(module_sp, tls_file_addr); |
2508 | |
2509 | if (tls_load_addr == LLDB_INVALID_ADDRESS(18446744073709551615UL)) { |
2510 | if (error_ptr) |
2511 | error_ptr->SetErrorString( |
2512 | "No TLS data currently exists for this thread."); |
2513 | return false; |
2514 | } |
2515 | |
2516 | stack.back().GetScalar() = tls_load_addr; |
2517 | stack.back().SetValueType(Value::ValueType::LoadAddress); |
2518 | } break; |
2519 | |
2520 | // OPCODE: DW_OP_addrx (DW_OP_GNU_addr_index is the legacy name.) |
2521 | // OPERANDS: 1 |
2522 | // ULEB128: index to the .debug_addr section |
2523 | // DESCRIPTION: Pushes an address to the stack from the .debug_addr |
2524 | // section with the base address specified by the DW_AT_addr_base attribute |
2525 | // and the 0 based index is the ULEB128 encoded index. |
2526 | case DW_OP_addrx: |
2527 | case DW_OP_GNU_addr_index: { |
2528 | if (!dwarf_cu) { |
2529 | if (error_ptr) |
2530 | error_ptr->SetErrorString("DW_OP_GNU_addr_index found without a " |
2531 | "compile unit being specified"); |
2532 | return false; |
2533 | } |
2534 | uint64_t index = opcodes.GetULEB128(&offset); |
2535 | lldb::addr_t value = dwarf_cu->ReadAddressFromDebugAddrSection(index); |
2536 | stack.push_back(Scalar(value)); |
2537 | if (target && |
2538 | target->GetArchitecture().GetCore() == ArchSpec::eCore_wasm32) { |
2539 | // wasm file sections aren't mapped into memory, therefore addresses can |
2540 | // never point into a file section and are always LoadAddresses. |
2541 | stack.back().SetValueType(Value::ValueType::LoadAddress); |
2542 | } else { |
2543 | stack.back().SetValueType(Value::ValueType::FileAddress); |
2544 | } |
2545 | } break; |
2546 | |
2547 | // OPCODE: DW_OP_GNU_const_index |
2548 | // OPERANDS: 1 |
2549 | // ULEB128: index to the .debug_addr section |
2550 | // DESCRIPTION: Pushes an constant with the size of a machine address to |
2551 | // the stack from the .debug_addr section with the base address specified |
2552 | // by the DW_AT_addr_base attribute and the 0 based index is the ULEB128 |
2553 | // encoded index. |
2554 | case DW_OP_GNU_const_index: { |
2555 | if (!dwarf_cu) { |
2556 | if (error_ptr) |
2557 | error_ptr->SetErrorString("DW_OP_GNU_const_index found without a " |
2558 | "compile unit being specified"); |
2559 | return false; |
2560 | } |
2561 | uint64_t index = opcodes.GetULEB128(&offset); |
2562 | lldb::addr_t value = dwarf_cu->ReadAddressFromDebugAddrSection(index); |
2563 | stack.push_back(Scalar(value)); |
2564 | } break; |
2565 | |
2566 | case DW_OP_GNU_entry_value: |
2567 | case DW_OP_entry_value: { |
2568 | if (!Evaluate_DW_OP_entry_value(stack, exe_ctx, reg_ctx, opcodes, offset, |
2569 | error_ptr, log)) { |
2570 | LLDB_ERRORF(error_ptr, "Could not evaluate %s.",do { if (error_ptr) { (error_ptr)->SetErrorStringWithFormat (("Could not evaluate %s."), DW_OP_value_to_name(op)); } } while (0); |
2571 | DW_OP_value_to_name(op))do { if (error_ptr) { (error_ptr)->SetErrorStringWithFormat (("Could not evaluate %s."), DW_OP_value_to_name(op)); } } while (0);; |
2572 | return false; |
2573 | } |
2574 | break; |
2575 | } |
2576 | |
2577 | default: |
2578 | if (dwarf_cu) { |
2579 | if (dwarf_cu->GetSymbolFileDWARF().ParseVendorDWARFOpcode( |
2580 | op, opcodes, offset, stack)) { |
2581 | break; |
2582 | } |
2583 | } |
2584 | if (error_ptr) |
2585 | error_ptr->SetErrorStringWithFormatv( |
2586 | "Unhandled opcode {0} in DWARFExpression", LocationAtom(op)); |
2587 | return false; |
2588 | } |
2589 | } |
2590 | |
2591 | if (stack.empty()) { |
2592 | // Nothing on the stack, check if we created a piece value from DW_OP_piece |
2593 | // or DW_OP_bit_piece opcodes |
2594 | if (pieces.GetBuffer().GetByteSize()) { |
2595 | result = pieces; |
2596 | return true; |
2597 | } |
2598 | if (error_ptr) |
2599 | error_ptr->SetErrorString("Stack empty after evaluation."); |
2600 | return false; |
2601 | } |
2602 | |
2603 | UpdateValueTypeFromLocationDescription( |
2604 | log, dwarf_cu, dwarf4_location_description_kind, &stack.back()); |
2605 | |
2606 | if (log && log->GetVerbose()) { |
2607 | size_t count = stack.size(); |
2608 | LLDB_LOGF(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("Stack after operation has %" "l" "u" " values:", (uint64_t)count); } while (0) |
2609 | "Stack after operation has %" PRIu64 " values:", (uint64_t)count)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("Stack after operation has %" "l" "u" " values:", (uint64_t)count); } while (0); |
2610 | for (size_t i = 0; i < count; ++i) { |
2611 | StreamString new_value; |
2612 | new_value.Printf("[%" PRIu64"l" "u" "]", (uint64_t)i); |
2613 | stack[i].Dump(&new_value); |
2614 | LLDB_LOGF(log, " %s", new_value.GetData())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" %s", new_value.GetData()); } while (0); |
2615 | } |
2616 | } |
2617 | result = stack.back(); |
2618 | return true; // Return true on success |
2619 | } |
2620 | |
2621 | bool DWARFExpression::ParseDWARFLocationList( |
2622 | const DWARFUnit *dwarf_cu, const DataExtractor &data, |
2623 | DWARFExpressionList *location_list) { |
2624 | location_list->Clear(); |
2625 | std::unique_ptr<llvm::DWARFLocationTable> loctable_up = |
2626 | dwarf_cu->GetLocationTable(data); |
2627 | Log *log = GetLog(LLDBLog::Expressions); |
2628 | auto lookup_addr = |
2629 | [&](uint32_t index) -> std::optional<llvm::object::SectionedAddress> { |
2630 | addr_t address = dwarf_cu->ReadAddressFromDebugAddrSection(index); |
2631 | if (address == LLDB_INVALID_ADDRESS(18446744073709551615UL)) |
2632 | return std::nullopt; |
2633 | return llvm::object::SectionedAddress{address}; |
2634 | }; |
2635 | auto process_list = [&](llvm::Expected<llvm::DWARFLocationExpression> loc) { |
2636 | if (!loc) { |
2637 | LLDB_LOG_ERROR(log, loc.takeError(), "{0}")do { ::lldb_private::Log *log_private = (log); ::llvm::Error error_private = (loc.takeError()); if (log_private && error_private ) { log_private->FormatError(::std::move(error_private), "lldb/source/Expression/DWARFExpression.cpp" , __func__, "{0}"); } else ::llvm::consumeError(::std::move(error_private )); } while (0); |
2638 | return true; |
2639 | } |
2640 | auto buffer_sp = |
2641 | std::make_shared<DataBufferHeap>(loc->Expr.data(), loc->Expr.size()); |
2642 | DWARFExpression expr = DWARFExpression(DataExtractor( |
2643 | buffer_sp, data.GetByteOrder(), data.GetAddressByteSize())); |
2644 | location_list->AddExpression(loc->Range->LowPC, loc->Range->HighPC, expr); |
2645 | return true; |
2646 | }; |
2647 | llvm::Error error = loctable_up->visitAbsoluteLocationList( |
2648 | 0, llvm::object::SectionedAddress{dwarf_cu->GetBaseAddress()}, |
2649 | lookup_addr, process_list); |
2650 | location_list->Sort(); |
2651 | if (error) { |
2652 | LLDB_LOG_ERROR(log, std::move(error), "{0}")do { ::lldb_private::Log *log_private = (log); ::llvm::Error error_private = (std::move(error)); if (log_private && error_private ) { log_private->FormatError(::std::move(error_private), "lldb/source/Expression/DWARFExpression.cpp" , __func__, "{0}"); } else ::llvm::consumeError(::std::move(error_private )); } while (0); |
2653 | return false; |
2654 | } |
2655 | return true; |
2656 | } |
2657 | |
2658 | bool DWARFExpression::MatchesOperand( |
2659 | StackFrame &frame, const Instruction::Operand &operand) const { |
2660 | using namespace OperandMatchers; |
2661 | |
2662 | RegisterContextSP reg_ctx_sp = frame.GetRegisterContext(); |
2663 | if (!reg_ctx_sp) { |
2664 | return false; |
2665 | } |
2666 | |
2667 | DataExtractor opcodes(m_data); |
2668 | |
2669 | lldb::offset_t op_offset = 0; |
2670 | uint8_t opcode = opcodes.GetU8(&op_offset); |
2671 | |
2672 | if (opcode == DW_OP_fbreg) { |
2673 | int64_t offset = opcodes.GetSLEB128(&op_offset); |
2674 | |
2675 | DWARFExpressionList *fb_expr = frame.GetFrameBaseExpression(nullptr); |
2676 | if (!fb_expr) { |
2677 | return false; |
2678 | } |
2679 | |
2680 | auto recurse = [&frame, fb_expr](const Instruction::Operand &child) { |
2681 | return fb_expr->MatchesOperand(frame, child); |
2682 | }; |
2683 | |
2684 | if (!offset && |
2685 | MatchUnaryOp(MatchOpType(Instruction::Operand::Type::Dereference), |
2686 | recurse)(operand)) { |
2687 | return true; |
2688 | } |
2689 | |
2690 | return MatchUnaryOp( |
2691 | MatchOpType(Instruction::Operand::Type::Dereference), |
2692 | MatchBinaryOp(MatchOpType(Instruction::Operand::Type::Sum), |
2693 | MatchImmOp(offset), recurse))(operand); |
2694 | } |
2695 | |
2696 | bool dereference = false; |
2697 | const RegisterInfo *reg = nullptr; |
2698 | int64_t offset = 0; |
2699 | |
2700 | if (opcode >= DW_OP_reg0 && opcode <= DW_OP_reg31) { |
2701 | reg = reg_ctx_sp->GetRegisterInfo(m_reg_kind, opcode - DW_OP_reg0); |
2702 | } else if (opcode >= DW_OP_breg0 && opcode <= DW_OP_breg31) { |
2703 | offset = opcodes.GetSLEB128(&op_offset); |
2704 | reg = reg_ctx_sp->GetRegisterInfo(m_reg_kind, opcode - DW_OP_breg0); |
2705 | } else if (opcode == DW_OP_regx) { |
2706 | uint32_t reg_num = static_cast<uint32_t>(opcodes.GetULEB128(&op_offset)); |
2707 | reg = reg_ctx_sp->GetRegisterInfo(m_reg_kind, reg_num); |
2708 | } else if (opcode == DW_OP_bregx) { |
2709 | uint32_t reg_num = static_cast<uint32_t>(opcodes.GetULEB128(&op_offset)); |
2710 | offset = opcodes.GetSLEB128(&op_offset); |
2711 | reg = reg_ctx_sp->GetRegisterInfo(m_reg_kind, reg_num); |
2712 | } else { |
2713 | return false; |
2714 | } |
2715 | |
2716 | if (!reg) { |
2717 | return false; |
2718 | } |
2719 | |
2720 | if (dereference) { |
2721 | if (!offset && |
2722 | MatchUnaryOp(MatchOpType(Instruction::Operand::Type::Dereference), |
2723 | MatchRegOp(*reg))(operand)) { |
2724 | return true; |
2725 | } |
2726 | |
2727 | return MatchUnaryOp( |
2728 | MatchOpType(Instruction::Operand::Type::Dereference), |
2729 | MatchBinaryOp(MatchOpType(Instruction::Operand::Type::Sum), |
2730 | MatchRegOp(*reg), |
2731 | MatchImmOp(offset)))(operand); |
2732 | } else { |
2733 | return MatchRegOp(*reg)(operand); |
2734 | } |
2735 | } |