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|
//===-- Variable.cpp ------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "lldb/Symbol/Variable.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/Core/ValueObjectVariable.h"
#include "lldb/Symbol/Block.h"
#include "lldb/Symbol/CompileUnit.h"
#include "lldb/Symbol/CompilerDecl.h"
#include "lldb/Symbol/CompilerDeclContext.h"
#include "lldb/Symbol/Function.h"
#include "lldb/Symbol/SymbolContext.h"
#include "lldb/Symbol/SymbolFile.h"
#include "lldb/Symbol/Type.h"
#include "lldb/Symbol/TypeSystem.h"
#include "lldb/Symbol/VariableList.h"
#include "lldb/Target/ABI.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/StackFrame.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
#include "lldb/Utility/RegularExpression.h"
#include "lldb/Utility/Stream.h"
#include "llvm/ADT/Twine.h"
using namespace lldb;
using namespace lldb_private;
Variable::Variable(lldb::user_id_t uid, const char *name, const char *mangled,
const lldb::SymbolFileTypeSP &symfile_type_sp,
ValueType scope, SymbolContextScope *context,
const RangeList &scope_range, Declaration *decl_ptr,
const DWARFExpressionList &location_list, bool external,
bool artificial, bool location_is_constant_data,
bool static_member)
: UserID(uid), m_name(name), m_mangled(ConstString(mangled)),
m_symfile_type_sp(symfile_type_sp), m_scope(scope),
m_owner_scope(context), m_scope_range(scope_range),
m_declaration(decl_ptr), m_location_list(location_list), m_external(external),
m_artificial(artificial), m_loc_is_const_data(location_is_constant_data),
m_static_member(static_member) {}
Variable::~Variable() = default;
lldb::LanguageType Variable::GetLanguage() const {
lldb::LanguageType lang = m_mangled.GuessLanguage();
if (lang != lldb::eLanguageTypeUnknown)
return lang;
if (auto *func = m_owner_scope->CalculateSymbolContextFunction()) {
if ((lang = func->GetLanguage()) != lldb::eLanguageTypeUnknown)
return lang;
} else if (auto *comp_unit =
m_owner_scope->CalculateSymbolContextCompileUnit()) {
if ((lang = comp_unit->GetLanguage()) != lldb::eLanguageTypeUnknown)
return lang;
}
return lldb::eLanguageTypeUnknown;
}
ConstString Variable::GetName() const {
ConstString name = m_mangled.GetName();
if (name)
return name;
return m_name;
}
ConstString Variable::GetUnqualifiedName() const { return m_name; }
bool Variable::NameMatches(ConstString name) const {
if (m_name == name)
return true;
SymbolContext variable_sc;
m_owner_scope->CalculateSymbolContext(&variable_sc);
return m_mangled.NameMatches(name);
}
bool Variable::NameMatches(const RegularExpression ®ex) const {
if (regex.Execute(m_name.AsCString()))
return true;
if (m_mangled)
return m_mangled.NameMatches(regex);
return false;
}
Type *Variable::GetType() {
if (m_symfile_type_sp)
return m_symfile_type_sp->GetType();
return nullptr;
}
void Variable::Dump(Stream *s, bool show_context) const {
s->Printf("%p: ", static_cast<const void *>(this));
s->Indent();
*s << "Variable" << (const UserID &)*this;
if (m_name)
*s << ", name = \"" << m_name << "\"";
if (m_symfile_type_sp) {
Type *type = m_symfile_type_sp->GetType();
if (type) {
s->Format(", type = {{{0:x-16}} {1} (", type->GetID(), type);
type->DumpTypeName(s);
s->PutChar(')');
}
}
if (m_scope != eValueTypeInvalid) {
s->PutCString(", scope = ");
switch (m_scope) {
case eValueTypeVariableGlobal:
s->PutCString(m_external ? "global" : "static");
break;
case eValueTypeVariableArgument:
s->PutCString("parameter");
break;
case eValueTypeVariableLocal:
s->PutCString("local");
break;
case eValueTypeVariableThreadLocal:
s->PutCString("thread local");
break;
default:
s->AsRawOstream() << "??? (" << m_scope << ')';
}
}
if (show_context && m_owner_scope != nullptr) {
s->PutCString(", context = ( ");
m_owner_scope->DumpSymbolContext(s);
s->PutCString(" )");
}
bool show_fullpaths = false;
m_declaration.Dump(s, show_fullpaths);
if (m_location_list.IsValid()) {
s->PutCString(", location = ");
ABISP abi;
if (m_owner_scope) {
ModuleSP module_sp(m_owner_scope->CalculateSymbolContextModule());
if (module_sp)
abi = ABI::FindPlugin(ProcessSP(), module_sp->GetArchitecture());
}
m_location_list.GetDescription(s, lldb::eDescriptionLevelBrief, abi.get());
}
if (m_external)
s->PutCString(", external");
if (m_artificial)
s->PutCString(", artificial");
s->EOL();
}
bool Variable::DumpDeclaration(Stream *s, bool show_fullpaths,
bool show_module) {
bool dumped_declaration_info = false;
if (m_owner_scope) {
SymbolContext sc;
m_owner_scope->CalculateSymbolContext(&sc);
sc.block = nullptr;
sc.line_entry.Clear();
bool show_inlined_frames = false;
const bool show_function_arguments = true;
const bool show_function_name = true;
dumped_declaration_info = sc.DumpStopContext(
s, nullptr, Address(), show_fullpaths, show_module, show_inlined_frames,
show_function_arguments, show_function_name);
if (sc.function)
s->PutChar(':');
}
if (m_declaration.DumpStopContext(s, false))
dumped_declaration_info = true;
return dumped_declaration_info;
}
size_t Variable::MemorySize() const { return sizeof(Variable); }
CompilerDeclContext Variable::GetDeclContext() {
Type *type = GetType();
if (type)
return type->GetSymbolFile()->GetDeclContextContainingUID(GetID());
return CompilerDeclContext();
}
CompilerDecl Variable::GetDecl() {
Type *type = GetType();
return type ? type->GetSymbolFile()->GetDeclForUID(GetID()) : CompilerDecl();
}
void Variable::CalculateSymbolContext(SymbolContext *sc) {
if (m_owner_scope) {
m_owner_scope->CalculateSymbolContext(sc);
sc->variable = this;
} else
sc->Clear(false);
}
bool Variable::LocationIsValidForFrame(StackFrame *frame) {
if (frame) {
Function *function =
frame->GetSymbolContext(eSymbolContextFunction).function;
if (function) {
TargetSP target_sp(frame->CalculateTarget());
addr_t loclist_base_load_addr =
function->GetAddressRange().GetBaseAddress().GetLoadAddress(
target_sp.get());
if (loclist_base_load_addr == LLDB_INVALID_ADDRESS)
return false;
// It is a location list. We just need to tell if the location list
// contains the current address when converted to a load address
return m_location_list.ContainsAddress(
loclist_base_load_addr,
frame->GetFrameCodeAddressForSymbolication().GetLoadAddress(
target_sp.get()));
}
}
return false;
}
bool Variable::LocationIsValidForAddress(const Address &address) {
// Be sure to resolve the address to section offset prior to calling this
// function.
if (address.IsSectionOffset()) {
// We need to check if the address is valid for both scope range and value
// range.
// Empty scope range means block range.
bool valid_in_scope_range =
GetScopeRange().IsEmpty() || GetScopeRange().FindEntryThatContains(
address.GetFileAddress()) != nullptr;
if (!valid_in_scope_range)
return false;
SymbolContext sc;
CalculateSymbolContext(&sc);
if (sc.module_sp == address.GetModule()) {
// Is the variable is described by a single location?
if (m_location_list.IsAlwaysValidSingleExpr()) {
// Yes it is, the location is valid.
return true;
}
if (sc.function) {
addr_t loclist_base_file_addr =
sc.function->GetAddressRange().GetBaseAddress().GetFileAddress();
if (loclist_base_file_addr == LLDB_INVALID_ADDRESS)
return false;
// It is a location list. We just need to tell if the location list
// contains the current address when converted to a load address
return m_location_list.ContainsAddress(loclist_base_file_addr,
address.GetFileAddress());
}
}
}
return false;
}
bool Variable::IsInScope(StackFrame *frame) {
switch (m_scope) {
case eValueTypeRegister:
case eValueTypeRegisterSet:
return frame != nullptr;
case eValueTypeConstResult:
case eValueTypeVariableGlobal:
case eValueTypeVariableStatic:
case eValueTypeVariableThreadLocal:
return true;
case eValueTypeVariableArgument:
case eValueTypeVariableLocal:
if (frame) {
// We don't have a location list, we just need to see if the block that
// this variable was defined in is currently
Block *deepest_frame_block =
frame->GetSymbolContext(eSymbolContextBlock).block;
if (deepest_frame_block) {
SymbolContext variable_sc;
CalculateSymbolContext(&variable_sc);
// Check for static or global variable defined at the compile unit
// level that wasn't defined in a block
if (variable_sc.block == nullptr)
return true;
// Check if the variable is valid in the current block
if (variable_sc.block != deepest_frame_block &&
!variable_sc.block->Contains(deepest_frame_block))
return false;
// If no scope range is specified then it means that the scope is the
// same as the scope of the enclosing lexical block.
if (m_scope_range.IsEmpty())
return true;
addr_t file_address = frame->GetFrameCodeAddress().GetFileAddress();
return m_scope_range.FindEntryThatContains(file_address) != nullptr;
}
}
break;
default:
break;
}
return false;
}
Status Variable::GetValuesForVariableExpressionPath(
llvm::StringRef variable_expr_path, ExecutionContextScope *scope,
GetVariableCallback callback, void *baton, VariableList &variable_list,
ValueObjectList &valobj_list) {
Status error;
if (!callback || variable_expr_path.empty()) {
error.SetErrorString("unknown error");
return error;
}
switch (variable_expr_path.front()) {
case '*':
error = Variable::GetValuesForVariableExpressionPath(
variable_expr_path.drop_front(), scope, callback, baton, variable_list,
valobj_list);
if (error.Fail()) {
error.SetErrorString("unknown error");
return error;
}
for (uint32_t i = 0; i < valobj_list.GetSize();) {
Status tmp_error;
ValueObjectSP valobj_sp(
valobj_list.GetValueObjectAtIndex(i)->Dereference(tmp_error));
if (tmp_error.Fail()) {
variable_list.RemoveVariableAtIndex(i);
valobj_list.RemoveValueObjectAtIndex(i);
} else {
valobj_list.SetValueObjectAtIndex(i, valobj_sp);
++i;
}
}
return error;
case '&': {
error = Variable::GetValuesForVariableExpressionPath(
variable_expr_path.drop_front(), scope, callback, baton, variable_list,
valobj_list);
if (error.Success()) {
for (uint32_t i = 0; i < valobj_list.GetSize();) {
Status tmp_error;
ValueObjectSP valobj_sp(
valobj_list.GetValueObjectAtIndex(i)->AddressOf(tmp_error));
if (tmp_error.Fail()) {
variable_list.RemoveVariableAtIndex(i);
valobj_list.RemoveValueObjectAtIndex(i);
} else {
valobj_list.SetValueObjectAtIndex(i, valobj_sp);
++i;
}
}
} else {
error.SetErrorString("unknown error");
}
return error;
} break;
default: {
static RegularExpression g_regex(
llvm::StringRef("^([A-Za-z_:][A-Za-z_0-9:]*)(.*)"));
llvm::SmallVector<llvm::StringRef, 2> matches;
variable_list.Clear();
if (!g_regex.Execute(variable_expr_path, &matches)) {
error.SetErrorStringWithFormatv(
"unable to extract a variable name from '{0}'", variable_expr_path);
return error;
}
std::string variable_name = matches[1].str();
if (!callback(baton, variable_name.c_str(), variable_list)) {
error.SetErrorString("unknown error");
return error;
}
uint32_t i = 0;
while (i < variable_list.GetSize()) {
VariableSP var_sp(variable_list.GetVariableAtIndex(i));
ValueObjectSP valobj_sp;
if (!var_sp) {
variable_list.RemoveVariableAtIndex(i);
continue;
}
ValueObjectSP variable_valobj_sp(
ValueObjectVariable::Create(scope, var_sp));
if (!variable_valobj_sp) {
variable_list.RemoveVariableAtIndex(i);
continue;
}
llvm::StringRef variable_sub_expr_path =
variable_expr_path.drop_front(variable_name.size());
if (!variable_sub_expr_path.empty()) {
valobj_sp = variable_valobj_sp->GetValueForExpressionPath(
variable_sub_expr_path);
if (!valobj_sp) {
error.SetErrorStringWithFormatv(
"invalid expression path '{0}' for variable '{1}'",
variable_sub_expr_path, var_sp->GetName().GetCString());
variable_list.RemoveVariableAtIndex(i);
continue;
}
} else {
// Just the name of a variable with no extras
valobj_sp = variable_valobj_sp;
}
valobj_list.Append(valobj_sp);
++i;
}
if (variable_list.GetSize() > 0) {
error.Clear();
return error;
}
} break;
}
error.SetErrorString("unknown error");
return error;
}
bool Variable::DumpLocations(Stream *s, const Address &address) {
SymbolContext sc;
CalculateSymbolContext(&sc);
ABISP abi;
if (m_owner_scope) {
ModuleSP module_sp(m_owner_scope->CalculateSymbolContextModule());
if (module_sp)
abi = ABI::FindPlugin(ProcessSP(), module_sp->GetArchitecture());
}
const addr_t file_addr = address.GetFileAddress();
if (sc.function) {
addr_t loclist_base_file_addr =
sc.function->GetAddressRange().GetBaseAddress().GetFileAddress();
if (loclist_base_file_addr == LLDB_INVALID_ADDRESS)
return false;
return m_location_list.DumpLocations(s, eDescriptionLevelBrief,
loclist_base_file_addr, file_addr,
abi.get());
}
return false;
}
static void PrivateAutoComplete(
StackFrame *frame, llvm::StringRef partial_path,
const llvm::Twine
&prefix_path, // Anything that has been resolved already will be in here
const CompilerType &compiler_type, CompletionRequest &request);
static void PrivateAutoCompleteMembers(
StackFrame *frame, const std::string &partial_member_name,
llvm::StringRef partial_path,
const llvm::Twine
&prefix_path, // Anything that has been resolved already will be in here
const CompilerType &compiler_type, CompletionRequest &request) {
// We are in a type parsing child members
const uint32_t num_bases = compiler_type.GetNumDirectBaseClasses();
if (num_bases > 0) {
for (uint32_t i = 0; i < num_bases; ++i) {
CompilerType base_class_type =
compiler_type.GetDirectBaseClassAtIndex(i, nullptr);
PrivateAutoCompleteMembers(frame, partial_member_name, partial_path,
prefix_path,
base_class_type.GetCanonicalType(), request);
}
}
const uint32_t num_vbases = compiler_type.GetNumVirtualBaseClasses();
if (num_vbases > 0) {
for (uint32_t i = 0; i < num_vbases; ++i) {
CompilerType vbase_class_type =
compiler_type.GetVirtualBaseClassAtIndex(i, nullptr);
PrivateAutoCompleteMembers(frame, partial_member_name, partial_path,
prefix_path,
vbase_class_type.GetCanonicalType(), request);
}
}
// We are in a type parsing child members
const uint32_t num_fields = compiler_type.GetNumFields();
if (num_fields > 0) {
for (uint32_t i = 0; i < num_fields; ++i) {
std::string member_name;
CompilerType member_compiler_type = compiler_type.GetFieldAtIndex(
i, member_name, nullptr, nullptr, nullptr);
if (partial_member_name.empty() ||
llvm::StringRef(member_name).starts_with(partial_member_name)) {
if (member_name == partial_member_name) {
PrivateAutoComplete(
frame, partial_path,
prefix_path + member_name, // Anything that has been resolved
// already will be in here
member_compiler_type.GetCanonicalType(), request);
} else {
request.AddCompletion((prefix_path + member_name).str());
}
}
}
}
}
static void PrivateAutoComplete(
StackFrame *frame, llvm::StringRef partial_path,
const llvm::Twine
&prefix_path, // Anything that has been resolved already will be in here
const CompilerType &compiler_type, CompletionRequest &request) {
// printf ("\nPrivateAutoComplete()\n\tprefix_path = '%s'\n\tpartial_path =
// '%s'\n", prefix_path.c_str(), partial_path.c_str());
std::string remaining_partial_path;
const lldb::TypeClass type_class = compiler_type.GetTypeClass();
if (partial_path.empty()) {
if (compiler_type.IsValid()) {
switch (type_class) {
default:
case eTypeClassArray:
case eTypeClassBlockPointer:
case eTypeClassBuiltin:
case eTypeClassComplexFloat:
case eTypeClassComplexInteger:
case eTypeClassEnumeration:
case eTypeClassFunction:
case eTypeClassMemberPointer:
case eTypeClassReference:
case eTypeClassTypedef:
case eTypeClassVector: {
request.AddCompletion(prefix_path.str());
} break;
case eTypeClassClass:
case eTypeClassStruct:
case eTypeClassUnion:
if (prefix_path.str().back() != '.')
request.AddCompletion((prefix_path + ".").str());
break;
case eTypeClassObjCObject:
case eTypeClassObjCInterface:
break;
case eTypeClassObjCObjectPointer:
case eTypeClassPointer: {
bool omit_empty_base_classes = true;
if (compiler_type.GetNumChildren(omit_empty_base_classes, nullptr) > 0)
request.AddCompletion((prefix_path + "->").str());
else {
request.AddCompletion(prefix_path.str());
}
} break;
}
} else {
if (frame) {
const bool get_file_globals = true;
VariableList *variable_list = frame->GetVariableList(get_file_globals,
nullptr);
if (variable_list) {
for (const VariableSP &var_sp : *variable_list)
request.AddCompletion(var_sp->GetName().AsCString());
}
}
}
} else {
const char ch = partial_path[0];
switch (ch) {
case '*':
if (prefix_path.str().empty()) {
PrivateAutoComplete(frame, partial_path.substr(1), "*", compiler_type,
request);
}
break;
case '&':
if (prefix_path.isTriviallyEmpty()) {
PrivateAutoComplete(frame, partial_path.substr(1), std::string("&"),
compiler_type, request);
}
break;
case '-':
if (partial_path.size() > 1 && partial_path[1] == '>' &&
!prefix_path.str().empty()) {
switch (type_class) {
case lldb::eTypeClassPointer: {
CompilerType pointee_type(compiler_type.GetPointeeType());
if (partial_path.size() > 2 && partial_path[2]) {
// If there is more after the "->", then search deeper
PrivateAutoComplete(frame, partial_path.substr(2),
prefix_path + "->",
pointee_type.GetCanonicalType(), request);
} else {
// Nothing after the "->", so list all members
PrivateAutoCompleteMembers(
frame, std::string(), std::string(), prefix_path + "->",
pointee_type.GetCanonicalType(), request);
}
} break;
default:
break;
}
}
break;
case '.':
if (compiler_type.IsValid()) {
switch (type_class) {
case lldb::eTypeClassUnion:
case lldb::eTypeClassStruct:
case lldb::eTypeClassClass:
if (partial_path.size() > 1 && partial_path[1]) {
// If there is more after the ".", then search deeper
PrivateAutoComplete(frame, partial_path.substr(1),
prefix_path + ".", compiler_type, request);
} else {
// Nothing after the ".", so list all members
PrivateAutoCompleteMembers(frame, std::string(), partial_path,
prefix_path + ".", compiler_type,
request);
}
break;
default:
break;
}
}
break;
default:
if (isalpha(ch) || ch == '_' || ch == '$') {
const size_t partial_path_len = partial_path.size();
size_t pos = 1;
while (pos < partial_path_len) {
const char curr_ch = partial_path[pos];
if (isalnum(curr_ch) || curr_ch == '_' || curr_ch == '$') {
++pos;
continue;
}
break;
}
std::string token(std::string(partial_path), 0, pos);
remaining_partial_path = std::string(partial_path.substr(pos));
if (compiler_type.IsValid()) {
PrivateAutoCompleteMembers(frame, token, remaining_partial_path,
prefix_path, compiler_type, request);
} else if (frame) {
// We haven't found our variable yet
const bool get_file_globals = true;
VariableList *variable_list =
frame->GetVariableList(get_file_globals, nullptr);
if (!variable_list)
break;
for (VariableSP var_sp : *variable_list) {
if (!var_sp)
continue;
llvm::StringRef variable_name = var_sp->GetName().GetStringRef();
if (variable_name.starts_with(token)) {
if (variable_name == token) {
Type *variable_type = var_sp->GetType();
if (variable_type) {
CompilerType variable_compiler_type(
variable_type->GetForwardCompilerType());
PrivateAutoComplete(
frame, remaining_partial_path,
prefix_path + token, // Anything that has been resolved
// already will be in here
variable_compiler_type.GetCanonicalType(), request);
} else {
request.AddCompletion((prefix_path + variable_name).str());
}
} else if (remaining_partial_path.empty()) {
request.AddCompletion((prefix_path + variable_name).str());
}
}
}
}
}
break;
}
}
}
void Variable::AutoComplete(const ExecutionContext &exe_ctx,
CompletionRequest &request) {
CompilerType compiler_type;
PrivateAutoComplete(exe_ctx.GetFramePtr(), request.GetCursorArgumentPrefix(),
"", compiler_type, request);
}
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