1 //===-- Block.h -------------------------------------------------*- C++ -*-===// 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 #ifndef LLDB_SYMBOL_BLOCK_H 10 #define LLDB_SYMBOL_BLOCK_H 11 12 #include "lldb/Core/AddressRange.h" 13 #include "lldb/Symbol/CompilerType.h" 14 #include "lldb/Symbol/LineEntry.h" 15 #include "lldb/Symbol/SymbolContext.h" 16 #include "lldb/Symbol/SymbolContextScope.h" 17 #include "lldb/Utility/RangeMap.h" 18 #include "lldb/Utility/Stream.h" 19 #include "lldb/Utility/UserID.h" 20 #include "lldb/lldb-private.h" 21 #include <vector> 22 23 namespace lldb_private { 24 25 /// \class Block Block.h "lldb/Symbol/Block.h" 26 /// A class that describes a single lexical block. 27 /// 28 /// A Function object owns a BlockList object which owns one or more 29 /// Block objects. The BlockList object contains a section offset address 30 /// range, and Block objects contain one or more ranges which are offsets into 31 /// that range. Blocks are can have discontiguous ranges within the BlockList 32 /// address range, and each block can contain child blocks each with their own 33 /// sets of ranges. 34 /// 35 /// Each block has a variable list that represents local, argument, and static 36 /// variables that are scoped to the block. 37 /// 38 /// Inlined functions are represented by attaching a InlineFunctionInfo shared 39 /// pointer object to a block. Inlined functions are represented as named 40 /// blocks. 41 class Block : public UserID, public SymbolContextScope { 42 public: 43 typedef RangeVector<uint32_t, uint32_t, 1> RangeList; 44 typedef RangeList::Entry Range; 45 46 /// Construct with a User ID \a uid, \a depth. 47 /// 48 /// Initialize this block with the specified UID \a uid. The \a depth in the 49 /// \a block_list is used to represent the parent, sibling, and child block 50 /// information and also allows for partial parsing at the block level. 51 /// 52 /// \param[in] uid 53 /// The UID for a given block. This value is given by the 54 /// SymbolFile plug-in and can be any value that helps the 55 /// SymbolFile plug-in to match this block back to the debug 56 /// information data that it parses for further or more in 57 /// depth parsing. Common values would be the index into a 58 /// table, or an offset into the debug information. 59 /// 60 /// \see BlockList 61 Block(lldb::user_id_t uid); 62 63 /// Destructor. 64 ~Block() override; 65 66 /// Add a child to this object. 67 /// 68 /// \param[in] child_block_sp 69 /// A shared pointer to a child block that will get added to 70 /// this block. 71 void AddChild(const lldb::BlockSP &child_block_sp); 72 73 /// Add a new offset range to this block. 74 void AddRange(const Range &range); 75 76 void FinalizeRanges(); 77 78 /// \copydoc SymbolContextScope::CalculateSymbolContext(SymbolContext*) 79 /// 80 /// \see SymbolContextScope 81 void CalculateSymbolContext(SymbolContext *sc) override; 82 83 lldb::ModuleSP CalculateSymbolContextModule() override; 84 85 CompileUnit *CalculateSymbolContextCompileUnit() override; 86 87 Function *CalculateSymbolContextFunction() override; 88 89 Block *CalculateSymbolContextBlock() override; 90 91 /// Check if an offset is in one of the block offset ranges. 92 /// 93 /// \param[in] range_offset 94 /// An offset into the Function's address range. 95 /// 96 /// \return 97 /// Returns \b true if \a range_offset falls in one of this 98 /// block's ranges, \b false otherwise. 99 bool Contains(lldb::addr_t range_offset) const; 100 101 /// Check if a offset range is in one of the block offset ranges. 102 /// 103 /// \param[in] range 104 /// An offset range into the Function's address range. 105 /// 106 /// \return 107 /// Returns \b true if \a range falls in one of this 108 /// block's ranges, \b false otherwise. 109 bool Contains(const Range &range) const; 110 111 /// Check if this object contains "block" as a child block at any depth. 112 /// 113 /// \param[in] block 114 /// A potential child block. 115 /// 116 /// \return 117 /// Returns \b true if \a block is a child of this block, \b 118 /// false otherwise. 119 bool Contains(const Block *block) const; 120 121 /// Dump the block contents. 122 /// 123 /// \param[in] s 124 /// The stream to which to dump the object description. 125 /// 126 /// \param[in] base_addr 127 /// The resolved start address of the Function's address 128 /// range. This should be resolved as the file or load address 129 /// prior to passing the value into this function for dumping. 130 /// 131 /// \param[in] depth 132 /// Limit the number of levels deep that this function should 133 /// print as this block can contain child blocks. Specify 134 /// INT_MAX to dump all child blocks. 135 /// 136 /// \param[in] show_context 137 /// If \b true, variables will dump their context information. 138 void Dump(Stream *s, lldb::addr_t base_addr, int32_t depth, 139 bool show_context) const; 140 141 /// \copydoc SymbolContextScope::DumpSymbolContext(Stream*) 142 /// 143 /// \see SymbolContextScope 144 void DumpSymbolContext(Stream *s) override; 145 146 void DumpAddressRanges(Stream *s, lldb::addr_t base_addr); 147 148 void GetDescription(Stream *s, Function *function, 149 lldb::DescriptionLevel level, Target *target) const; 150 151 /// Get the parent block. 152 /// 153 /// \return 154 /// The parent block pointer, or nullptr if this block has no 155 /// parent. 156 Block *GetParent() const; 157 158 /// Get the inlined block that contains this block. 159 /// 160 /// \return 161 /// If this block contains inlined function info, it will return 162 /// this block, else parent blocks will be searched to see if 163 /// any contain this block. nullptr will be returned if this block 164 /// nor any parent blocks are inlined function blocks. 165 Block *GetContainingInlinedBlock(); 166 167 /// Get the inlined parent block for this block. 168 /// 169 /// \return 170 /// The parent block pointer, or nullptr if this block has no 171 /// parent. 172 Block *GetInlinedParent(); 173 174 //------------------------------------------------------------------ 175 /// Get the inlined block at the given call site that contains this block. 176 /// 177 /// @param[in] find_call_site 178 /// a declaration with the file and line of the call site to find. 179 /// 180 /// @return 181 /// If this block contains inlined function info and is at the call 182 /// site given by the file and line at the given \b declaration, then 183 /// it will return this block, otherwise the parent blocks will be 184 /// searched to see if any is at the call site. nullptr will be returned 185 /// if no block is found at the call site. 186 //------------------------------------------------------------------ 187 Block * 188 GetContainingInlinedBlockWithCallSite(const Declaration &find_call_site); 189 190 /// Get the sibling block for this block. 191 /// 192 /// \return 193 /// The sibling block pointer, or nullptr if this block has no 194 /// sibling. 195 Block *GetSibling() const; 196 197 /// Get the first child block. 198 /// 199 /// \return 200 /// The first child block pointer, or nullptr if this block has no 201 /// children. GetFirstChild()202 Block *GetFirstChild() const { 203 return (m_children.empty() ? nullptr : m_children.front().get()); 204 } 205 206 /// Get the variable list for this block only. 207 /// 208 /// \param[in] can_create 209 /// If \b true, the variables can be parsed if they already 210 /// haven't been, else the current state of the block will be 211 /// returned. 212 /// 213 /// \return 214 /// A variable list shared pointer that contains all variables 215 /// for this block. 216 lldb::VariableListSP GetBlockVariableList(bool can_create); 217 218 /// Get the variable list for this block and optionally all child blocks if 219 /// \a get_child_variables is \b true. 220 /// 221 /// \param[in] can_create 222 /// If \b true, the variables can be parsed if they already 223 /// haven't been, else the current state of the block will be 224 /// returned. Passing \b true for this parameter can be used 225 /// to see the current state of what has been parsed up to this 226 /// point. 227 /// 228 /// \param[in] get_child_block_variables 229 /// If \b true, all variables from all child blocks will be 230 /// added to the variable list. 231 /// 232 /// \return 233 /// A variable list shared pointer that contains all variables 234 /// for this block. 235 uint32_t AppendBlockVariables(bool can_create, bool get_child_block_variables, 236 bool stop_if_child_block_is_inlined_function, 237 const std::function<bool(Variable *)> &filter, 238 VariableList *variable_list); 239 240 /// Appends the variables from this block, and optionally from all parent 241 /// blocks, to \a variable_list. 242 /// 243 /// \param[in] can_create 244 /// If \b true, the variables can be parsed if they already 245 /// haven't been, else the current state of the block will be 246 /// returned. Passing \b true for this parameter can be used 247 /// to see the current state of what has been parsed up to this 248 /// point. 249 /// 250 /// \param[in] get_parent_variables 251 /// If \b true, all variables from all parent blocks will be 252 /// added to the variable list. 253 /// 254 /// \param[in] stop_if_block_is_inlined_function 255 /// If \b true, all variables from all parent blocks will be 256 /// added to the variable list until there are no parent blocks 257 /// or the parent block has inlined function info. 258 /// 259 /// \param[in,out] variable_list 260 /// All variables in this block, and optionally all parent 261 /// blocks will be added to this list. 262 /// 263 /// \return 264 /// The number of variable that were appended to \a 265 /// variable_list. 266 uint32_t AppendVariables(bool can_create, bool get_parent_variables, 267 bool stop_if_block_is_inlined_function, 268 const std::function<bool(Variable *)> &filter, 269 VariableList *variable_list); 270 271 /// Get const accessor for any inlined function information. 272 /// 273 /// \return 274 /// A const pointer to any inlined function information, or nullptr 275 /// if this is a regular block. GetInlinedFunctionInfo()276 const InlineFunctionInfo *GetInlinedFunctionInfo() const { 277 return m_inlineInfoSP.get(); 278 } 279 280 /// Get the symbol file which contains debug info for this block's 281 /// symbol context module. 282 /// 283 /// \return A pointer to the symbol file or nullptr. 284 SymbolFile *GetSymbolFile(); 285 286 CompilerDeclContext GetDeclContext(); 287 288 /// Get the memory cost of this object. 289 /// 290 /// Returns the cost of this object plus any owned objects from the ranges, 291 /// variables, and inline function information. 292 /// 293 /// \return 294 /// The number of bytes that this object occupies in memory. 295 size_t MemorySize() const; 296 297 /// Set accessor for any inlined function information. 298 /// 299 /// \param[in] name 300 /// The method name for the inlined function. This value should 301 /// not be nullptr. 302 /// 303 /// \param[in] mangled 304 /// The mangled method name for the inlined function. This can 305 /// be nullptr if there is no mangled name for an inlined function 306 /// or if the name is the same as \a name. 307 /// 308 /// \param[in] decl_ptr 309 /// A optional pointer to declaration information for the 310 /// inlined function information. This value can be nullptr to 311 /// indicate that no declaration information is available. 312 /// 313 /// \param[in] call_decl_ptr 314 /// Optional calling location declaration information that 315 /// describes from where this inlined function was called. 316 void SetInlinedFunctionInfo(const char *name, const char *mangled, 317 const Declaration *decl_ptr, 318 const Declaration *call_decl_ptr); 319 SetParentScope(SymbolContextScope * parent_scope)320 void SetParentScope(SymbolContextScope *parent_scope) { 321 m_parent_scope = parent_scope; 322 } 323 324 /// Set accessor for the variable list. 325 /// 326 /// Called by the SymbolFile plug-ins after they have parsed the variable 327 /// lists and are ready to hand ownership of the list over to this object. 328 /// 329 /// \param[in] variable_list_sp 330 /// A shared pointer to a VariableList. SetVariableList(lldb::VariableListSP & variable_list_sp)331 void SetVariableList(lldb::VariableListSP &variable_list_sp) { 332 m_variable_list_sp = variable_list_sp; 333 } 334 BlockInfoHasBeenParsed()335 bool BlockInfoHasBeenParsed() const { return m_parsed_block_info; } 336 337 void SetBlockInfoHasBeenParsed(bool b, bool set_children); 338 339 Block *FindBlockByID(lldb::user_id_t block_id); 340 341 Block *FindInnermostBlockByOffset(const lldb::addr_t offset); 342 GetNumRanges()343 size_t GetNumRanges() const { return m_ranges.GetSize(); } 344 345 bool GetRangeContainingOffset(const lldb::addr_t offset, Range &range); 346 347 bool GetRangeContainingAddress(const Address &addr, AddressRange &range); 348 349 bool GetRangeContainingLoadAddress(lldb::addr_t load_addr, Target &target, 350 AddressRange &range); 351 352 uint32_t GetRangeIndexContainingAddress(const Address &addr); 353 354 // Since blocks might have multiple discontiguous address ranges, we need to 355 // be able to get at any of the address ranges in a block. 356 bool GetRangeAtIndex(uint32_t range_idx, AddressRange &range); 357 358 AddressRanges GetRanges(); 359 360 bool GetStartAddress(Address &addr); 361 362 void SetDidParseVariables(bool b, bool set_children); 363 364 protected: 365 typedef std::vector<lldb::BlockSP> collection; 366 // Member variables. 367 SymbolContextScope *m_parent_scope; 368 collection m_children; 369 RangeList m_ranges; 370 lldb::InlineFunctionInfoSP m_inlineInfoSP; ///< Inlined function information. 371 lldb::VariableListSP m_variable_list_sp; ///< The variable list for all local, 372 ///static and parameter variables 373 ///scoped to this block. 374 bool m_parsed_block_info : 1, ///< Set to true if this block and it's children 375 ///have all been parsed 376 m_parsed_block_variables : 1, m_parsed_child_blocks : 1; 377 378 // A parent of child blocks can be asked to find a sibling block given 379 // one of its child blocks 380 Block *GetSiblingForChild(const Block *child_block) const; 381 382 private: 383 Block(const Block &) = delete; 384 const Block &operator=(const Block &) = delete; 385 }; 386 387 } // namespace lldb_private 388 389 #endif // LLDB_SYMBOL_BLOCK_H 390