1 //===-- Value.cpp -----------------------------------------------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "lldb/Core/Value.h"
11 
12 #include "lldb/Core/Address.h"
13 #include "lldb/Core/Module.h"
14 #include "lldb/Symbol/CompilerType.h"
15 #include "lldb/Symbol/ObjectFile.h"
16 #include "lldb/Symbol/SymbolContext.h"
17 #include "lldb/Symbol/Type.h"
18 #include "lldb/Symbol/Variable.h"
19 #include "lldb/Target/ExecutionContext.h"
20 #include "lldb/Target/Process.h"
21 #include "lldb/Target/SectionLoadList.h"
22 #include "lldb/Target/Target.h"
23 #include "lldb/Utility/ConstString.h"
24 #include "lldb/Utility/DataBufferHeap.h"
25 #include "lldb/Utility/DataExtractor.h"
26 #include "lldb/Utility/Endian.h"
27 #include "lldb/Utility/FileSpec.h"
28 #include "lldb/Utility/State.h"
29 #include "lldb/Utility/Stream.h"
30 #include "lldb/lldb-defines.h"
31 #include "lldb/lldb-forward.h"
32 #include "lldb/lldb-types.h"
33 
34 #include <memory>
35 #include <string>
36 
37 #include <inttypes.h>
38 
39 using namespace lldb;
40 using namespace lldb_private;
41 
42 Value::Value()
43     : m_value(), m_vector(), m_compiler_type(), m_context(NULL),
44       m_value_type(eValueTypeScalar), m_context_type(eContextTypeInvalid),
45       m_data_buffer() {}
46 
47 Value::Value(const Scalar &scalar)
48     : m_value(scalar), m_vector(), m_compiler_type(), m_context(NULL),
49       m_value_type(eValueTypeScalar), m_context_type(eContextTypeInvalid),
50       m_data_buffer() {}
51 
52 Value::Value(const void *bytes, int len)
53     : m_value(), m_vector(), m_compiler_type(), m_context(NULL),
54       m_value_type(eValueTypeHostAddress), m_context_type(eContextTypeInvalid),
55       m_data_buffer() {
56   SetBytes(bytes, len);
57 }
58 
59 Value::Value(const Value &v)
60     : m_value(v.m_value), m_vector(v.m_vector),
61       m_compiler_type(v.m_compiler_type), m_context(v.m_context),
62       m_value_type(v.m_value_type), m_context_type(v.m_context_type),
63       m_data_buffer() {
64   const uintptr_t rhs_value =
65       (uintptr_t)v.m_value.ULongLong(LLDB_INVALID_ADDRESS);
66   if ((rhs_value != 0) &&
67       (rhs_value == (uintptr_t)v.m_data_buffer.GetBytes())) {
68     m_data_buffer.CopyData(v.m_data_buffer.GetBytes(),
69                            v.m_data_buffer.GetByteSize());
70 
71     m_value = (uintptr_t)m_data_buffer.GetBytes();
72   }
73 }
74 
75 Value &Value::operator=(const Value &rhs) {
76   if (this != &rhs) {
77     m_value = rhs.m_value;
78     m_vector = rhs.m_vector;
79     m_compiler_type = rhs.m_compiler_type;
80     m_context = rhs.m_context;
81     m_value_type = rhs.m_value_type;
82     m_context_type = rhs.m_context_type;
83     const uintptr_t rhs_value =
84         (uintptr_t)rhs.m_value.ULongLong(LLDB_INVALID_ADDRESS);
85     if ((rhs_value != 0) &&
86         (rhs_value == (uintptr_t)rhs.m_data_buffer.GetBytes())) {
87       m_data_buffer.CopyData(rhs.m_data_buffer.GetBytes(),
88                              rhs.m_data_buffer.GetByteSize());
89 
90       m_value = (uintptr_t)m_data_buffer.GetBytes();
91     }
92   }
93   return *this;
94 }
95 
96 void Value::SetBytes(const void *bytes, int len) {
97   m_value_type = eValueTypeHostAddress;
98   m_data_buffer.CopyData(bytes, len);
99   m_value = (uintptr_t)m_data_buffer.GetBytes();
100 }
101 
102 void Value::AppendBytes(const void *bytes, int len) {
103   m_value_type = eValueTypeHostAddress;
104   m_data_buffer.AppendData(bytes, len);
105   m_value = (uintptr_t)m_data_buffer.GetBytes();
106 }
107 
108 void Value::Dump(Stream *strm) {
109   m_value.GetValue(strm, true);
110   strm->Printf(", value_type = %s, context = %p, context_type = %s",
111                Value::GetValueTypeAsCString(m_value_type), m_context,
112                Value::GetContextTypeAsCString(m_context_type));
113 }
114 
115 Value::ValueType Value::GetValueType() const { return m_value_type; }
116 
117 AddressType Value::GetValueAddressType() const {
118   switch (m_value_type) {
119   default:
120   case eValueTypeScalar:
121     break;
122   case eValueTypeLoadAddress:
123     return eAddressTypeLoad;
124   case eValueTypeFileAddress:
125     return eAddressTypeFile;
126   case eValueTypeHostAddress:
127     return eAddressTypeHost;
128   }
129   return eAddressTypeInvalid;
130 }
131 
132 RegisterInfo *Value::GetRegisterInfo() const {
133   if (m_context_type == eContextTypeRegisterInfo)
134     return static_cast<RegisterInfo *>(m_context);
135   return NULL;
136 }
137 
138 Type *Value::GetType() {
139   if (m_context_type == eContextTypeLLDBType)
140     return static_cast<Type *>(m_context);
141   return NULL;
142 }
143 
144 size_t Value::AppendDataToHostBuffer(const Value &rhs) {
145   if (this == &rhs)
146     return 0;
147 
148   size_t curr_size = m_data_buffer.GetByteSize();
149   Status error;
150   switch (rhs.GetValueType()) {
151   case eValueTypeScalar: {
152     const size_t scalar_size = rhs.m_value.GetByteSize();
153     if (scalar_size > 0) {
154       const size_t new_size = curr_size + scalar_size;
155       if (ResizeData(new_size) == new_size) {
156         rhs.m_value.GetAsMemoryData(m_data_buffer.GetBytes() + curr_size,
157                                     scalar_size, endian::InlHostByteOrder(),
158                                     error);
159         return scalar_size;
160       }
161     }
162   } break;
163   case eValueTypeVector: {
164     const size_t vector_size = rhs.m_vector.length;
165     if (vector_size > 0) {
166       const size_t new_size = curr_size + vector_size;
167       if (ResizeData(new_size) == new_size) {
168         ::memcpy(m_data_buffer.GetBytes() + curr_size, rhs.m_vector.bytes,
169                  vector_size);
170         return vector_size;
171       }
172     }
173   } break;
174   case eValueTypeFileAddress:
175   case eValueTypeLoadAddress:
176   case eValueTypeHostAddress: {
177     const uint8_t *src = rhs.GetBuffer().GetBytes();
178     const size_t src_len = rhs.GetBuffer().GetByteSize();
179     if (src && src_len > 0) {
180       const size_t new_size = curr_size + src_len;
181       if (ResizeData(new_size) == new_size) {
182         ::memcpy(m_data_buffer.GetBytes() + curr_size, src, src_len);
183         return src_len;
184       }
185     }
186   } break;
187   }
188   return 0;
189 }
190 
191 size_t Value::ResizeData(size_t len) {
192   m_value_type = eValueTypeHostAddress;
193   m_data_buffer.SetByteSize(len);
194   m_value = (uintptr_t)m_data_buffer.GetBytes();
195   return m_data_buffer.GetByteSize();
196 }
197 
198 bool Value::ValueOf(ExecutionContext *exe_ctx) {
199   switch (m_context_type) {
200   case eContextTypeInvalid:
201   case eContextTypeRegisterInfo: // RegisterInfo *
202   case eContextTypeLLDBType:     // Type *
203     break;
204 
205   case eContextTypeVariable: // Variable *
206     ResolveValue(exe_ctx);
207     return true;
208   }
209   return false;
210 }
211 
212 uint64_t Value::GetValueByteSize(Status *error_ptr, ExecutionContext *exe_ctx) {
213   switch (m_context_type) {
214   case eContextTypeRegisterInfo: // RegisterInfo *
215     if (GetRegisterInfo()) {
216       if (error_ptr)
217         error_ptr->Clear();
218       return GetRegisterInfo()->byte_size;
219     }
220     break;
221 
222   case eContextTypeInvalid:
223   case eContextTypeLLDBType: // Type *
224   case eContextTypeVariable: // Variable *
225   {
226     auto *scope = exe_ctx ? exe_ctx->GetBestExecutionContextScope() : nullptr;
227     if (llvm::Optional<uint64_t> size = GetCompilerType().GetByteSize(scope)) {
228       if (error_ptr)
229         error_ptr->Clear();
230       return *size;
231     }
232     break;
233   }
234   }
235   if (error_ptr && error_ptr->Success())
236     error_ptr->SetErrorString("Unable to determine byte size.");
237   return 0;
238 }
239 
240 const CompilerType &Value::GetCompilerType() {
241   if (!m_compiler_type.IsValid()) {
242     switch (m_context_type) {
243     case eContextTypeInvalid:
244       break;
245 
246     case eContextTypeRegisterInfo:
247       break; // TODO: Eventually convert into a compiler type?
248 
249     case eContextTypeLLDBType: {
250       Type *lldb_type = GetType();
251       if (lldb_type)
252         m_compiler_type = lldb_type->GetForwardCompilerType();
253     } break;
254 
255     case eContextTypeVariable: {
256       Variable *variable = GetVariable();
257       if (variable) {
258         Type *variable_type = variable->GetType();
259         if (variable_type)
260           m_compiler_type = variable_type->GetForwardCompilerType();
261       }
262     } break;
263     }
264   }
265 
266   return m_compiler_type;
267 }
268 
269 void Value::SetCompilerType(const CompilerType &compiler_type) {
270   m_compiler_type = compiler_type;
271 }
272 
273 lldb::Format Value::GetValueDefaultFormat() {
274   switch (m_context_type) {
275   case eContextTypeRegisterInfo:
276     if (GetRegisterInfo())
277       return GetRegisterInfo()->format;
278     break;
279 
280   case eContextTypeInvalid:
281   case eContextTypeLLDBType:
282   case eContextTypeVariable: {
283     const CompilerType &ast_type = GetCompilerType();
284     if (ast_type.IsValid())
285       return ast_type.GetFormat();
286   } break;
287   }
288 
289   // Return a good default in case we can't figure anything out
290   return eFormatHex;
291 }
292 
293 bool Value::GetData(DataExtractor &data) {
294   switch (m_value_type) {
295   default:
296     break;
297 
298   case eValueTypeScalar:
299     if (m_value.GetData(data))
300       return true;
301     break;
302 
303   case eValueTypeLoadAddress:
304   case eValueTypeFileAddress:
305   case eValueTypeHostAddress:
306     if (m_data_buffer.GetByteSize()) {
307       data.SetData(m_data_buffer.GetBytes(), m_data_buffer.GetByteSize(),
308                    data.GetByteOrder());
309       return true;
310     }
311     break;
312   }
313 
314   return false;
315 }
316 
317 Status Value::GetValueAsData(ExecutionContext *exe_ctx, DataExtractor &data,
318                              uint32_t data_offset, Module *module) {
319   data.Clear();
320 
321   Status error;
322   lldb::addr_t address = LLDB_INVALID_ADDRESS;
323   AddressType address_type = eAddressTypeFile;
324   Address file_so_addr;
325   const CompilerType &ast_type = GetCompilerType();
326   switch (m_value_type) {
327   case eValueTypeVector:
328     if (ast_type.IsValid())
329       data.SetAddressByteSize(ast_type.GetPointerByteSize());
330     else
331       data.SetAddressByteSize(sizeof(void *));
332     data.SetData(m_vector.bytes, m_vector.length, m_vector.byte_order);
333     break;
334 
335   case eValueTypeScalar: {
336     data.SetByteOrder(endian::InlHostByteOrder());
337     if (ast_type.IsValid())
338       data.SetAddressByteSize(ast_type.GetPointerByteSize());
339     else
340       data.SetAddressByteSize(sizeof(void *));
341 
342     uint32_t limit_byte_size = UINT32_MAX;
343 
344     if (llvm::Optional<uint64_t> size = ast_type.GetByteSize(
345             exe_ctx ? exe_ctx->GetBestExecutionContextScope() : nullptr))
346       limit_byte_size = *size;
347 
348     if (limit_byte_size <= m_value.GetByteSize()) {
349       if (m_value.GetData(data, limit_byte_size))
350         return error; // Success;
351     }
352 
353     error.SetErrorStringWithFormat("extracting data from value failed");
354     break;
355   }
356   case eValueTypeLoadAddress:
357     if (exe_ctx == NULL) {
358       error.SetErrorString("can't read load address (no execution context)");
359     } else {
360       Process *process = exe_ctx->GetProcessPtr();
361       if (process == NULL || !process->IsAlive()) {
362         Target *target = exe_ctx->GetTargetPtr();
363         if (target) {
364           // Allow expressions to run and evaluate things when the target has
365           // memory sections loaded. This allows you to use "target modules
366           // load" to load your executable and any shared libraries, then
367           // execute commands where you can look at types in data sections.
368           const SectionLoadList &target_sections = target->GetSectionLoadList();
369           if (!target_sections.IsEmpty()) {
370             address = m_value.ULongLong(LLDB_INVALID_ADDRESS);
371             if (target_sections.ResolveLoadAddress(address, file_so_addr)) {
372               address_type = eAddressTypeLoad;
373               data.SetByteOrder(target->GetArchitecture().GetByteOrder());
374               data.SetAddressByteSize(
375                   target->GetArchitecture().GetAddressByteSize());
376             } else
377               address = LLDB_INVALID_ADDRESS;
378           }
379         } else {
380           error.SetErrorString("can't read load address (invalid process)");
381         }
382       } else {
383         address = m_value.ULongLong(LLDB_INVALID_ADDRESS);
384         address_type = eAddressTypeLoad;
385         data.SetByteOrder(
386             process->GetTarget().GetArchitecture().GetByteOrder());
387         data.SetAddressByteSize(
388             process->GetTarget().GetArchitecture().GetAddressByteSize());
389       }
390     }
391     break;
392 
393   case eValueTypeFileAddress:
394     if (exe_ctx == NULL) {
395       error.SetErrorString("can't read file address (no execution context)");
396     } else if (exe_ctx->GetTargetPtr() == NULL) {
397       error.SetErrorString("can't read file address (invalid target)");
398     } else {
399       address = m_value.ULongLong(LLDB_INVALID_ADDRESS);
400       if (address == LLDB_INVALID_ADDRESS) {
401         error.SetErrorString("invalid file address");
402       } else {
403         if (module == NULL) {
404           // The only thing we can currently lock down to a module so that we
405           // can resolve a file address, is a variable.
406           Variable *variable = GetVariable();
407           if (variable) {
408             SymbolContext var_sc;
409             variable->CalculateSymbolContext(&var_sc);
410             module = var_sc.module_sp.get();
411           }
412         }
413 
414         if (module) {
415           bool resolved = false;
416           ObjectFile *objfile = module->GetObjectFile();
417           if (objfile) {
418             Address so_addr(address, objfile->GetSectionList());
419             addr_t load_address =
420                 so_addr.GetLoadAddress(exe_ctx->GetTargetPtr());
421             bool process_launched_and_stopped =
422                 exe_ctx->GetProcessPtr()
423                     ? StateIsStoppedState(exe_ctx->GetProcessPtr()->GetState(),
424                                           true /* must_exist */)
425                     : false;
426             // Don't use the load address if the process has exited.
427             if (load_address != LLDB_INVALID_ADDRESS &&
428                 process_launched_and_stopped) {
429               resolved = true;
430               address = load_address;
431               address_type = eAddressTypeLoad;
432               data.SetByteOrder(
433                   exe_ctx->GetTargetRef().GetArchitecture().GetByteOrder());
434               data.SetAddressByteSize(exe_ctx->GetTargetRef()
435                                           .GetArchitecture()
436                                           .GetAddressByteSize());
437             } else {
438               if (so_addr.IsSectionOffset()) {
439                 resolved = true;
440                 file_so_addr = so_addr;
441                 data.SetByteOrder(objfile->GetByteOrder());
442                 data.SetAddressByteSize(objfile->GetAddressByteSize());
443               }
444             }
445           }
446           if (!resolved) {
447             Variable *variable = GetVariable();
448 
449             if (module) {
450               if (variable)
451                 error.SetErrorStringWithFormat(
452                     "unable to resolve the module for file address 0x%" PRIx64
453                     " for variable '%s' in %s",
454                     address, variable->GetName().AsCString(""),
455                     module->GetFileSpec().GetPath().c_str());
456               else
457                 error.SetErrorStringWithFormat(
458                     "unable to resolve the module for file address 0x%" PRIx64
459                     " in %s",
460                     address, module->GetFileSpec().GetPath().c_str());
461             } else {
462               if (variable)
463                 error.SetErrorStringWithFormat(
464                     "unable to resolve the module for file address 0x%" PRIx64
465                     " for variable '%s'",
466                     address, variable->GetName().AsCString(""));
467               else
468                 error.SetErrorStringWithFormat(
469                     "unable to resolve the module for file address 0x%" PRIx64,
470                     address);
471             }
472           }
473         } else {
474           // Can't convert a file address to anything valid without more
475           // context (which Module it came from)
476           error.SetErrorString(
477               "can't read memory from file address without more context");
478         }
479       }
480     }
481     break;
482 
483   case eValueTypeHostAddress:
484     address = m_value.ULongLong(LLDB_INVALID_ADDRESS);
485     address_type = eAddressTypeHost;
486     if (exe_ctx) {
487       Target *target = exe_ctx->GetTargetPtr();
488       if (target) {
489         data.SetByteOrder(target->GetArchitecture().GetByteOrder());
490         data.SetAddressByteSize(target->GetArchitecture().GetAddressByteSize());
491         break;
492       }
493     }
494     // fallback to host settings
495     data.SetByteOrder(endian::InlHostByteOrder());
496     data.SetAddressByteSize(sizeof(void *));
497     break;
498   }
499 
500   // Bail if we encountered any errors
501   if (error.Fail())
502     return error;
503 
504   if (address == LLDB_INVALID_ADDRESS) {
505     error.SetErrorStringWithFormat("invalid %s address",
506                                    address_type == eAddressTypeHost ? "host"
507                                                                     : "load");
508     return error;
509   }
510 
511   // If we got here, we need to read the value from memory
512   size_t byte_size = GetValueByteSize(&error, exe_ctx);
513 
514   // Bail if we encountered any errors getting the byte size
515   if (error.Fail())
516     return error;
517 
518   // Make sure we have enough room within "data", and if we don't make
519   // something large enough that does
520   if (!data.ValidOffsetForDataOfSize(data_offset, byte_size)) {
521     auto data_sp =
522         std::make_shared<DataBufferHeap>(data_offset + byte_size, '\0');
523     data.SetData(data_sp);
524   }
525 
526   uint8_t *dst = const_cast<uint8_t *>(data.PeekData(data_offset, byte_size));
527   if (dst != NULL) {
528     if (address_type == eAddressTypeHost) {
529       // The address is an address in this process, so just copy it.
530       if (address == 0) {
531         error.SetErrorStringWithFormat(
532             "trying to read from host address of 0.");
533         return error;
534       }
535       memcpy(dst, reinterpret_cast<uint8_t *>(address), byte_size);
536     } else if ((address_type == eAddressTypeLoad) ||
537                (address_type == eAddressTypeFile)) {
538       if (file_so_addr.IsValid()) {
539         // We have a file address that we were able to translate into a section
540         // offset address so we might be able to read this from the object
541         // files if we don't have a live process. Lets always try and read from
542         // the process if we have one though since we want to read the actual
543         // value by setting "prefer_file_cache" to false.
544         const bool prefer_file_cache = false;
545         if (exe_ctx->GetTargetRef().ReadMemory(file_so_addr, prefer_file_cache,
546                                                dst, byte_size,
547                                                error) != byte_size) {
548           error.SetErrorStringWithFormat(
549               "read memory from 0x%" PRIx64 " failed", (uint64_t)address);
550         }
551       } else {
552         // The execution context might have a NULL process, but it might have a
553         // valid process in the exe_ctx->target, so use the
554         // ExecutionContext::GetProcess accessor to ensure we get the process
555         // if there is one.
556         Process *process = exe_ctx->GetProcessPtr();
557 
558         if (process) {
559           const size_t bytes_read =
560               process->ReadMemory(address, dst, byte_size, error);
561           if (bytes_read != byte_size)
562             error.SetErrorStringWithFormat(
563                 "read memory from 0x%" PRIx64 " failed (%u of %u bytes read)",
564                 (uint64_t)address, (uint32_t)bytes_read, (uint32_t)byte_size);
565         } else {
566           error.SetErrorStringWithFormat("read memory from 0x%" PRIx64
567                                          " failed (invalid process)",
568                                          (uint64_t)address);
569         }
570       }
571     } else {
572       error.SetErrorStringWithFormat("unsupported AddressType value (%i)",
573                                      address_type);
574     }
575   } else {
576     error.SetErrorStringWithFormat("out of memory");
577   }
578 
579   return error;
580 }
581 
582 Scalar &Value::ResolveValue(ExecutionContext *exe_ctx) {
583   const CompilerType &compiler_type = GetCompilerType();
584   if (compiler_type.IsValid()) {
585     switch (m_value_type) {
586     case eValueTypeScalar: // raw scalar value
587       break;
588 
589     default:
590     case eValueTypeFileAddress:
591     case eValueTypeLoadAddress: // load address value
592     case eValueTypeHostAddress: // host address value (for memory in the process
593                                 // that is using liblldb)
594     {
595       DataExtractor data;
596       lldb::addr_t addr = m_value.ULongLong(LLDB_INVALID_ADDRESS);
597       Status error(GetValueAsData(exe_ctx, data, 0, NULL));
598       if (error.Success()) {
599         Scalar scalar;
600         if (compiler_type.GetValueAsScalar(data, 0, data.GetByteSize(),
601                                            scalar)) {
602           m_value = scalar;
603           m_value_type = eValueTypeScalar;
604         } else {
605           if ((uintptr_t)addr != (uintptr_t)m_data_buffer.GetBytes()) {
606             m_value.Clear();
607             m_value_type = eValueTypeScalar;
608           }
609         }
610       } else {
611         if ((uintptr_t)addr != (uintptr_t)m_data_buffer.GetBytes()) {
612           m_value.Clear();
613           m_value_type = eValueTypeScalar;
614         }
615       }
616     } break;
617     }
618   }
619   return m_value;
620 }
621 
622 Variable *Value::GetVariable() {
623   if (m_context_type == eContextTypeVariable)
624     return static_cast<Variable *>(m_context);
625   return NULL;
626 }
627 
628 void Value::Clear() {
629   m_value.Clear();
630   m_vector.Clear();
631   m_compiler_type.Clear();
632   m_value_type = eValueTypeScalar;
633   m_context = NULL;
634   m_context_type = eContextTypeInvalid;
635   m_data_buffer.Clear();
636 }
637 
638 const char *Value::GetValueTypeAsCString(ValueType value_type) {
639   switch (value_type) {
640   case eValueTypeScalar:
641     return "scalar";
642   case eValueTypeVector:
643     return "vector";
644   case eValueTypeFileAddress:
645     return "file address";
646   case eValueTypeLoadAddress:
647     return "load address";
648   case eValueTypeHostAddress:
649     return "host address";
650   };
651   return "???";
652 }
653 
654 const char *Value::GetContextTypeAsCString(ContextType context_type) {
655   switch (context_type) {
656   case eContextTypeInvalid:
657     return "invalid";
658   case eContextTypeRegisterInfo:
659     return "RegisterInfo *";
660   case eContextTypeLLDBType:
661     return "Type *";
662   case eContextTypeVariable:
663     return "Variable *";
664   };
665   return "???";
666 }
667 
668 void Value::ConvertToLoadAddress(Module *module, Target *target) {
669   if (!module || !target || (GetValueType() != eValueTypeFileAddress))
670     return;
671 
672   lldb::addr_t file_addr = GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
673   if (file_addr == LLDB_INVALID_ADDRESS)
674     return;
675 
676   Address so_addr;
677   if (!module->ResolveFileAddress(file_addr, so_addr))
678     return;
679   lldb::addr_t load_addr = so_addr.GetLoadAddress(target);
680   if (load_addr == LLDB_INVALID_ADDRESS)
681     return;
682 
683   SetValueType(Value::eValueTypeLoadAddress);
684   GetScalar() = load_addr;
685 }
686 
687 ValueList::ValueList(const ValueList &rhs) { m_values = rhs.m_values; }
688 
689 const ValueList &ValueList::operator=(const ValueList &rhs) {
690   m_values = rhs.m_values;
691   return *this;
692 }
693 
694 void ValueList::PushValue(const Value &value) { m_values.push_back(value); }
695 
696 size_t ValueList::GetSize() { return m_values.size(); }
697 
698 Value *ValueList::GetValueAtIndex(size_t idx) {
699   if (idx < GetSize()) {
700     return &(m_values[idx]);
701   } else
702     return NULL;
703 }
704 
705 void ValueList::Clear() { m_values.clear(); }
706