1 //===-- PDBASTParser.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 "PDBASTParser.h"
11 
12 #include "clang/AST/CharUnits.h"
13 #include "clang/AST/Decl.h"
14 #include "clang/AST/DeclCXX.h"
15 
16 #include "lldb/Symbol/ClangASTContext.h"
17 #include "lldb/Symbol/ClangUtil.h"
18 #include "lldb/Symbol/Declaration.h"
19 #include "lldb/Symbol/SymbolFile.h"
20 #include "lldb/Symbol/TypeSystem.h"
21 
22 #include "llvm/DebugInfo/PDB/PDBSymbol.h"
23 #include "llvm/DebugInfo/PDB/PDBSymbolData.h"
24 #include "llvm/DebugInfo/PDB/PDBSymbolTypeArray.h"
25 #include "llvm/DebugInfo/PDB/PDBSymbolTypeBuiltin.h"
26 #include "llvm/DebugInfo/PDB/PDBSymbolTypeEnum.h"
27 #include "llvm/DebugInfo/PDB/PDBSymbolTypeFunctionArg.h"
28 #include "llvm/DebugInfo/PDB/PDBSymbolTypeFunctionSig.h"
29 #include "llvm/DebugInfo/PDB/PDBSymbolTypeTypedef.h"
30 #include "llvm/DebugInfo/PDB/PDBSymbolTypeUDT.h"
31 
32 using namespace lldb;
33 using namespace lldb_private;
34 using namespace llvm;
35 using namespace llvm::pdb;
36 
37 namespace {
38 int TranslateUdtKind(PDB_UdtType pdb_kind) {
39   switch (pdb_kind) {
40   case PDB_UdtType::Class:
41     return clang::TTK_Class;
42   case PDB_UdtType::Struct:
43     return clang::TTK_Struct;
44   case PDB_UdtType::Union:
45     return clang::TTK_Union;
46   case PDB_UdtType::Interface:
47     return clang::TTK_Interface;
48   }
49   return clang::TTK_Class;
50 }
51 
52 lldb::Encoding TranslateBuiltinEncoding(PDB_BuiltinType type) {
53   switch (type) {
54   case PDB_BuiltinType::Float:
55     return lldb::eEncodingIEEE754;
56   case PDB_BuiltinType::Int:
57   case PDB_BuiltinType::Long:
58   case PDB_BuiltinType::Char:
59     return lldb::eEncodingSint;
60   case PDB_BuiltinType::Bool:
61   case PDB_BuiltinType::UInt:
62   case PDB_BuiltinType::ULong:
63   case PDB_BuiltinType::HResult:
64     return lldb::eEncodingUint;
65   default:
66     return lldb::eEncodingInvalid;
67   }
68 }
69 }
70 
71 PDBASTParser::PDBASTParser(lldb_private::ClangASTContext &ast) : m_ast(ast) {}
72 
73 PDBASTParser::~PDBASTParser() {}
74 
75 // DebugInfoASTParser interface
76 
77 lldb::TypeSP PDBASTParser::CreateLLDBTypeFromPDBType(const PDBSymbol &type) {
78   // PDB doesn't maintain enough information to robustly rebuild the entire
79   // tree, and this is most problematic when it comes to figure out the
80   // right DeclContext to put a type in.  So for now, everything goes in
81   // the translation unit decl as a fully qualified type.
82   clang::DeclContext *tu_decl_ctx = m_ast.GetTranslationUnitDecl();
83   Declaration decl;
84 
85   if (auto udt = llvm::dyn_cast<PDBSymbolTypeUDT>(&type)) {
86     AccessType access = lldb::eAccessPublic;
87     PDB_UdtType udt_kind = udt->getUdtKind();
88 
89     if (udt_kind == PDB_UdtType::Class)
90       access = lldb::eAccessPrivate;
91 
92     CompilerType clang_type = m_ast.CreateRecordType(
93         tu_decl_ctx, access, udt->getName().c_str(), TranslateUdtKind(udt_kind),
94         lldb::eLanguageTypeC_plus_plus, nullptr);
95 
96     m_ast.SetHasExternalStorage(clang_type.GetOpaqueQualType(), true);
97 
98     return std::make_shared<Type>(type.getSymIndexId(), m_ast.GetSymbolFile(),
99                                   ConstString(udt->getName()), udt->getLength(),
100                                   nullptr, LLDB_INVALID_UID,
101                                   Type::eEncodingIsUID, decl, clang_type,
102                                   Type::eResolveStateForward);
103   } else if (auto enum_type = llvm::dyn_cast<PDBSymbolTypeEnum>(&type)) {
104     std::string name = enum_type->getName();
105     lldb::Encoding encoding =
106         TranslateBuiltinEncoding(enum_type->getBuiltinType());
107     uint64_t bytes = enum_type->getLength();
108     CompilerType builtin_type =
109         m_ast.GetBuiltinTypeForEncodingAndBitSize(encoding, bytes * 8);
110 
111     CompilerType ast_enum = m_ast.CreateEnumerationType(
112         name.c_str(), tu_decl_ctx, decl, builtin_type);
113     auto enum_values = enum_type->findAllChildren<PDBSymbolData>();
114     while (auto enum_value = enum_values->getNext()) {
115       if (enum_value->getDataKind() != PDB_DataKind::Constant)
116         continue;
117       AddEnumValue(ast_enum, *enum_value);
118     }
119 
120     return std::make_shared<Type>(type.getSymIndexId(), m_ast.GetSymbolFile(),
121                                   ConstString(name), bytes, nullptr,
122                                   LLDB_INVALID_UID, Type::eEncodingIsUID, decl,
123                                   ast_enum, Type::eResolveStateFull);
124   } else if (auto type_def = llvm::dyn_cast<PDBSymbolTypeTypedef>(&type)) {
125     Type *target_type =
126         m_ast.GetSymbolFile()->ResolveTypeUID(type_def->getTypeId());
127     std::string name = type_def->getName();
128     uint64_t bytes = type_def->getLength();
129     if (!target_type)
130       return nullptr;
131     CompilerType target_ast_type = target_type->GetFullCompilerType();
132     CompilerDeclContext target_decl_ctx =
133         m_ast.GetSymbolFile()->GetDeclContextForUID(target_type->GetID());
134     CompilerType ast_typedef =
135         m_ast.CreateTypedefType(target_ast_type, name.c_str(), target_decl_ctx);
136     return std::make_shared<Type>(
137         type_def->getSymIndexId(), m_ast.GetSymbolFile(), ConstString(name),
138         bytes, nullptr, target_type->GetID(), Type::eEncodingIsTypedefUID, decl,
139         ast_typedef, Type::eResolveStateFull);
140   } else if (auto func_sig = llvm::dyn_cast<PDBSymbolTypeFunctionSig>(&type)) {
141     auto arg_enum = func_sig->getArguments();
142     uint32_t num_args = arg_enum->getChildCount();
143     std::vector<CompilerType> arg_list(num_args);
144     while (auto arg = arg_enum->getNext()) {
145       Type *arg_type =
146           m_ast.GetSymbolFile()->ResolveTypeUID(arg->getSymIndexId());
147       // If there's some error looking up one of the dependent types of this
148       // function signature, bail.
149       if (!arg_type)
150         return nullptr;
151       CompilerType arg_ast_type = arg_type->GetFullCompilerType();
152       arg_list.push_back(arg_ast_type);
153     }
154     auto pdb_return_type = func_sig->getReturnType();
155     Type *return_type =
156         m_ast.GetSymbolFile()->ResolveTypeUID(pdb_return_type->getSymIndexId());
157     // If there's some error looking up one of the dependent types of this
158     // function signature, bail.
159     if (!return_type)
160       return nullptr;
161     CompilerType return_ast_type = return_type->GetFullCompilerType();
162     uint32_t type_quals = 0;
163     if (func_sig->isConstType())
164       type_quals |= clang::Qualifiers::Const;
165     if (func_sig->isVolatileType())
166       type_quals |= clang::Qualifiers::Volatile;
167     CompilerType func_sig_ast_type = m_ast.CreateFunctionType(
168         return_ast_type, &arg_list[0], num_args, false, type_quals);
169 
170     return std::make_shared<Type>(
171         func_sig->getSymIndexId(), m_ast.GetSymbolFile(), ConstString(), 0,
172         nullptr, LLDB_INVALID_UID, Type::eEncodingIsUID, decl,
173         func_sig_ast_type, Type::eResolveStateFull);
174   } else if (auto array_type = llvm::dyn_cast<PDBSymbolTypeArray>(&type)) {
175     uint32_t num_elements = array_type->getCount();
176     uint32_t element_uid = array_type->getElementType()->getSymIndexId();
177     uint32_t bytes = array_type->getLength();
178 
179     Type *element_type = m_ast.GetSymbolFile()->ResolveTypeUID(element_uid);
180     CompilerType element_ast_type = element_type->GetFullCompilerType();
181     CompilerType array_ast_type =
182         m_ast.CreateArrayType(element_ast_type, num_elements, false);
183     return std::make_shared<Type>(
184         array_type->getSymIndexId(), m_ast.GetSymbolFile(), ConstString(),
185         bytes, nullptr, LLDB_INVALID_UID, Type::eEncodingIsUID, decl,
186         array_ast_type, Type::eResolveStateFull);
187   }
188   return nullptr;
189 }
190 
191 bool PDBASTParser::AddEnumValue(CompilerType enum_type,
192                                 const PDBSymbolData &enum_value) const {
193   Declaration decl;
194   Variant v = enum_value.getValue();
195   std::string name = enum_value.getName();
196   int64_t raw_value;
197   switch (v.Type) {
198   case PDB_VariantType::Int8:
199     raw_value = v.Value.Int8;
200     break;
201   case PDB_VariantType::Int16:
202     raw_value = v.Value.Int16;
203     break;
204   case PDB_VariantType::Int32:
205     raw_value = v.Value.Int32;
206     break;
207   case PDB_VariantType::Int64:
208     raw_value = v.Value.Int64;
209     break;
210   case PDB_VariantType::UInt8:
211     raw_value = v.Value.UInt8;
212     break;
213   case PDB_VariantType::UInt16:
214     raw_value = v.Value.UInt16;
215     break;
216   case PDB_VariantType::UInt32:
217     raw_value = v.Value.UInt32;
218     break;
219   case PDB_VariantType::UInt64:
220     raw_value = v.Value.UInt64;
221     break;
222   default:
223     return false;
224   }
225   CompilerType underlying_type =
226       m_ast.GetEnumerationIntegerType(enum_type.GetOpaqueQualType());
227   uint32_t byte_size = m_ast.getASTContext()->getTypeSize(
228       ClangUtil::GetQualType(underlying_type));
229   return m_ast.AddEnumerationValueToEnumerationType(
230       enum_type.GetOpaqueQualType(), underlying_type, decl, name.c_str(),
231       raw_value, byte_size * 8);
232 }
233