| //===-- ClangExpressionDeclMap.h --------------------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef liblldb_ClangExpressionDeclMap_h_ |
| #define liblldb_ClangExpressionDeclMap_h_ |
| |
| // C Includes |
| #include <signal.h> |
| #include <stdint.h> |
| |
| // C++ Includes |
| #include <vector> |
| |
| // Other libraries and framework includes |
| // Project includes |
| #include "llvm/ADT/APInt.h" |
| #include "llvm/ADT/DenseMap.h" |
| #include "clang/AST/Decl.h" |
| #include "lldb/lldb-public.h" |
| #include "lldb/Core/ClangForward.h" |
| #include "lldb/Core/Value.h" |
| #include "lldb/Expression/ClangASTSource.h" |
| #include "lldb/Expression/ClangExpressionVariable.h" |
| #include "lldb/Expression/Materializer.h" |
| #include "lldb/Symbol/TaggedASTType.h" |
| #include "lldb/Symbol/SymbolContext.h" |
| #include "lldb/Target/ExecutionContext.h" |
| |
| namespace lldb_private { |
| |
| //---------------------------------------------------------------------- |
| /// @class ClangExpressionDeclMap ClangExpressionDeclMap.h "lldb/Expression/ClangExpressionDeclMap.h" |
| /// @brief Manages named entities that are defined in LLDB's debug information. |
| /// |
| /// The Clang parser uses the ClangASTSource as an interface to request named |
| /// entities from outside an expression. The ClangASTSource reports back, listing |
| /// all possible objects corresponding to a particular name. But it in turn |
| /// relies on ClangExpressionDeclMap, which performs several important functions. |
| /// |
| /// First, it records what variables and functions were looked up and what Decls |
| /// were returned for them. |
| /// |
| /// Second, it constructs a struct on behalf of IRForTarget, recording which |
| /// variables should be placed where and relaying this information back so that |
| /// IRForTarget can generate context-independent code. |
| /// |
| /// Third, it "materializes" this struct on behalf of the expression command, |
| /// finding the current values of each variable and placing them into the |
| /// struct so that it can be passed to the JITted version of the IR. |
| /// |
| /// Fourth and finally, it "dematerializes" the struct after the JITted code has |
| /// has executed, placing the new values back where it found the old ones. |
| //---------------------------------------------------------------------- |
| class ClangExpressionDeclMap : |
| public ClangASTSource |
| { |
| public: |
| //------------------------------------------------------------------ |
| /// Constructor |
| /// |
| /// Initializes class variables. |
| /// |
| /// @param[in] keep_result_in_memory |
| /// If true, inhibits the normal deallocation of the memory for |
| /// the result persistent variable, and instead marks the variable |
| /// as persisting. |
| /// |
| /// @param[in] exe_ctx |
| /// The execution context to use when parsing. |
| //------------------------------------------------------------------ |
| ClangExpressionDeclMap (bool keep_result_in_memory, |
| ExecutionContext &exe_ctx); |
| |
| //------------------------------------------------------------------ |
| /// Destructor |
| //------------------------------------------------------------------ |
| ~ClangExpressionDeclMap (); |
| |
| //------------------------------------------------------------------ |
| /// Enable the state needed for parsing and IR transformation. |
| /// |
| /// @param[in] exe_ctx |
| /// The execution context to use when finding types for variables. |
| /// Also used to find a "scratch" AST context to store result types. |
| /// |
| /// @param[in] materializer |
| /// If non-NULL, the materializer to populate with information about |
| /// the variables to use |
| /// |
| /// @return |
| /// True if parsing is possible; false if it is unsafe to continue. |
| //------------------------------------------------------------------ |
| bool |
| WillParse (ExecutionContext &exe_ctx, |
| Materializer *materializer); |
| |
| //------------------------------------------------------------------ |
| /// [Used by ClangExpressionParser] For each variable that had an unknown |
| /// type at the beginning of parsing, determine its final type now. |
| /// |
| /// @return |
| /// True on success; false otherwise. |
| //------------------------------------------------------------------ |
| bool |
| ResolveUnknownTypes(); |
| |
| //------------------------------------------------------------------ |
| /// Disable the state needed for parsing and IR transformation. |
| //------------------------------------------------------------------ |
| void |
| DidParse (); |
| |
| //------------------------------------------------------------------ |
| /// [Used by IRForTarget] Add a variable to the list of persistent |
| /// variables for the process. |
| /// |
| /// @param[in] decl |
| /// The Clang declaration for the persistent variable, used for |
| /// lookup during parsing. |
| /// |
| /// @param[in] name |
| /// The name of the persistent variable, usually $something. |
| /// |
| /// @param[in] type |
| /// The type of the variable, in the Clang parser's context. |
| /// |
| /// @return |
| /// True on success; false otherwise. |
| //------------------------------------------------------------------ |
| bool |
| AddPersistentVariable (const clang::NamedDecl *decl, |
| const ConstString &name, |
| TypeFromParser type, |
| bool is_result, |
| bool is_lvalue); |
| |
| //------------------------------------------------------------------ |
| /// [Used by IRForTarget] Add a variable to the struct that needs to |
| /// be materialized each time the expression runs. |
| /// |
| /// @param[in] decl |
| /// The Clang declaration for the variable. |
| /// |
| /// @param[in] name |
| /// The name of the variable. |
| /// |
| /// @param[in] value |
| /// The LLVM IR value for this variable. |
| /// |
| /// @param[in] size |
| /// The size of the variable in bytes. |
| /// |
| /// @param[in] alignment |
| /// The required alignment of the variable in bytes. |
| /// |
| /// @return |
| /// True on success; false otherwise. |
| //------------------------------------------------------------------ |
| bool |
| AddValueToStruct (const clang::NamedDecl *decl, |
| const ConstString &name, |
| llvm::Value *value, |
| size_t size, |
| lldb::offset_t alignment); |
| |
| //------------------------------------------------------------------ |
| /// [Used by IRForTarget] Finalize the struct, laying out the position |
| /// of each object in it. |
| /// |
| /// @return |
| /// True on success; false otherwise. |
| //------------------------------------------------------------------ |
| bool |
| DoStructLayout (); |
| |
| //------------------------------------------------------------------ |
| /// [Used by IRForTarget] Get general information about the laid-out |
| /// struct after DoStructLayout() has been called. |
| /// |
| /// @param[out] num_elements |
| /// The number of elements in the struct. |
| /// |
| /// @param[out] size |
| /// The size of the struct, in bytes. |
| /// |
| /// @param[out] alignment |
| /// The alignment of the struct, in bytes. |
| /// |
| /// @return |
| /// True if the information could be retrieved; false otherwise. |
| //------------------------------------------------------------------ |
| bool |
| GetStructInfo (uint32_t &num_elements, |
| size_t &size, |
| lldb::offset_t &alignment); |
| |
| //------------------------------------------------------------------ |
| /// [Used by IRForTarget] Get specific information about one field |
| /// of the laid-out struct after DoStructLayout() has been called. |
| /// |
| /// @param[out] decl |
| /// The parsed Decl for the field, as generated by ClangASTSource |
| /// on ClangExpressionDeclMap's behalf. In the case of the result |
| /// value, this will have the name $__lldb_result even if the |
| /// result value ends up having the name $1. This is an |
| /// implementation detail of IRForTarget. |
| /// |
| /// @param[out] value |
| /// The IR value for the field (usually a GlobalVariable). In |
| /// the case of the result value, this will have the correct |
| /// name ($1, for instance). This is an implementation detail |
| /// of IRForTarget. |
| /// |
| /// @param[out] offset |
| /// The offset of the field from the beginning of the struct. |
| /// As long as the struct is aligned according to its required |
| /// alignment, this offset will align the field correctly. |
| /// |
| /// @param[out] name |
| /// The name of the field as used in materialization. |
| /// |
| /// @param[in] index |
| /// The index of the field about which information is requested. |
| /// |
| /// @return |
| /// True if the information could be retrieved; false otherwise. |
| //------------------------------------------------------------------ |
| bool |
| GetStructElement (const clang::NamedDecl *&decl, |
| llvm::Value *&value, |
| lldb::offset_t &offset, |
| ConstString &name, |
| uint32_t index); |
| |
| //------------------------------------------------------------------ |
| /// [Used by IRForTarget] Get information about a function given its |
| /// Decl. |
| /// |
| /// @param[in] decl |
| /// The parsed Decl for the Function, as generated by ClangASTSource |
| /// on ClangExpressionDeclMap's behalf. |
| /// |
| /// @param[out] ptr |
| /// The absolute address of the function in the target. |
| /// |
| /// @return |
| /// True if the information could be retrieved; false otherwise. |
| //------------------------------------------------------------------ |
| bool |
| GetFunctionInfo (const clang::NamedDecl *decl, |
| uint64_t &ptr); |
| |
| //------------------------------------------------------------------ |
| /// [Used by IRForTarget] Get the address of a function given nothing |
| /// but its name. Some functions are needed but didn't get Decls made |
| /// during parsing -- specifically, sel_registerName is never called |
| /// in the generated IR but we need to call it nonetheless. |
| /// |
| /// @param[in] name |
| /// The name of the function. |
| /// |
| /// @param[out] ptr |
| /// The absolute address of the function in the target. |
| /// |
| /// @return |
| /// True if the address could be retrieved; false otherwise. |
| //------------------------------------------------------------------ |
| bool |
| GetFunctionAddress (const ConstString &name, |
| uint64_t &ptr); |
| |
| //------------------------------------------------------------------ |
| /// [Used by IRForTarget] Get the address of a symbol given nothing |
| /// but its name. |
| /// |
| /// @param[in] target |
| /// The target to find the symbol in. If not provided, |
| /// then the current parsing context's Target. |
| /// |
| /// @param[in] process |
| /// The process to use. For Objective-C symbols, the process's |
| /// Objective-C language runtime may be queried if the process |
| /// is non-NULL. |
| /// |
| /// @param[in] name |
| /// The name of the symbol. |
| /// |
| /// @param[in] module |
| /// The module to limit the search to. This can be NULL |
| /// |
| /// @return |
| /// Valid load address for the symbol |
| //------------------------------------------------------------------ |
| lldb::addr_t |
| GetSymbolAddress (Target &target, |
| Process *process, |
| const ConstString &name, |
| lldb::SymbolType symbol_type, |
| Module *module = NULL); |
| |
| lldb::addr_t |
| GetSymbolAddress (const ConstString &name, |
| lldb::SymbolType symbol_type); |
| |
| //------------------------------------------------------------------ |
| /// [Used by IRInterpreter] Get basic target information. |
| /// |
| /// @param[out] byte_order |
| /// The byte order of the target. |
| /// |
| /// @param[out] address_byte_size |
| /// The size of a pointer in bytes. |
| /// |
| /// @return |
| /// True if the information could be determined; false |
| /// otherwise. |
| //------------------------------------------------------------------ |
| struct TargetInfo |
| { |
| lldb::ByteOrder byte_order; |
| size_t address_byte_size; |
| |
| TargetInfo() : |
| byte_order(lldb::eByteOrderInvalid), |
| address_byte_size(0) |
| { |
| } |
| |
| bool IsValid() |
| { |
| return (byte_order != lldb::eByteOrderInvalid && |
| address_byte_size != 0); |
| } |
| }; |
| TargetInfo GetTargetInfo(); |
| |
| //------------------------------------------------------------------ |
| /// [Used by ClangASTSource] Find all entities matching a given name, |
| /// using a NameSearchContext to make Decls for them. |
| /// |
| /// @param[in] context |
| /// The NameSearchContext that can construct Decls for this name. |
| /// |
| /// @return |
| /// True on success; false otherwise. |
| //------------------------------------------------------------------ |
| void |
| FindExternalVisibleDecls (NameSearchContext &context); |
| |
| //------------------------------------------------------------------ |
| /// Find all entities matching a given name in a given module/namespace, |
| /// using a NameSearchContext to make Decls for them. |
| /// |
| /// @param[in] context |
| /// The NameSearchContext that can construct Decls for this name. |
| /// |
| /// @param[in] module |
| /// If non-NULL, the module to query. |
| /// |
| /// @param[in] namespace_decl |
| /// If valid and module is non-NULL, the parent namespace. |
| /// |
| /// @param[in] name |
| /// The name as a plain C string. The NameSearchContext contains |
| /// a DeclarationName for the name so at first the name may seem |
| /// redundant, but ClangExpressionDeclMap operates in RTTI land so |
| /// it can't access DeclarationName. |
| /// |
| /// @param[in] current_id |
| /// The ID for the current FindExternalVisibleDecls invocation, |
| /// for logging purposes. |
| /// |
| /// @return |
| /// True on success; false otherwise. |
| //------------------------------------------------------------------ |
| void |
| FindExternalVisibleDecls (NameSearchContext &context, |
| lldb::ModuleSP module, |
| ClangNamespaceDecl &namespace_decl, |
| unsigned int current_id); |
| private: |
| ClangExpressionVariableList m_found_entities; ///< All entities that were looked up for the parser. |
| ClangExpressionVariableList m_struct_members; ///< All entities that need to be placed in the struct. |
| bool m_keep_result_in_memory; ///< True if result persistent variables generated by this expression should stay in memory. |
| |
| //---------------------------------------------------------------------- |
| /// The following values should not live beyond parsing |
| //---------------------------------------------------------------------- |
| class ParserVars |
| { |
| public: |
| ParserVars(ClangExpressionDeclMap &decl_map) : |
| m_exe_ctx(), |
| m_sym_ctx(), |
| m_persistent_vars(NULL), |
| m_enable_lookups(false), |
| m_materializer(NULL), |
| m_decl_map(decl_map) |
| { |
| } |
| |
| Target * |
| GetTarget() |
| { |
| if (m_exe_ctx.GetTargetPtr()) |
| return m_exe_ctx.GetTargetPtr(); |
| else if (m_sym_ctx.target_sp) |
| m_sym_ctx.target_sp.get(); |
| return NULL; |
| } |
| |
| ExecutionContext m_exe_ctx; ///< The execution context to use when parsing. |
| SymbolContext m_sym_ctx; ///< The symbol context to use in finding variables and types. |
| ClangPersistentVariables *m_persistent_vars; ///< The persistent variables for the process. |
| bool m_enable_lookups; ///< Set to true during parsing if we have found the first "$__lldb" name. |
| TargetInfo m_target_info; ///< Basic information about the target. |
| Materializer *m_materializer; ///< If non-NULL, the materializer to use when reporting used variables. |
| private: |
| ClangExpressionDeclMap &m_decl_map; |
| DISALLOW_COPY_AND_ASSIGN (ParserVars); |
| }; |
| |
| std::unique_ptr<ParserVars> m_parser_vars; |
| |
| //---------------------------------------------------------------------- |
| /// Activate parser-specific variables |
| //---------------------------------------------------------------------- |
| void |
| EnableParserVars() |
| { |
| if (!m_parser_vars.get()) |
| m_parser_vars.reset(new ParserVars(*this)); |
| } |
| |
| //---------------------------------------------------------------------- |
| /// Deallocate parser-specific variables |
| //---------------------------------------------------------------------- |
| void |
| DisableParserVars() |
| { |
| m_parser_vars.reset(); |
| } |
| |
| //---------------------------------------------------------------------- |
| /// The following values contain layout information for the materialized |
| /// struct, but are not specific to a single materialization |
| //---------------------------------------------------------------------- |
| struct StructVars { |
| StructVars() : |
| m_struct_alignment(0), |
| m_struct_size(0), |
| m_struct_laid_out(false), |
| m_result_name(), |
| m_object_pointer_type(NULL, NULL) |
| { |
| } |
| |
| lldb::offset_t m_struct_alignment; ///< The alignment of the struct in bytes. |
| size_t m_struct_size; ///< The size of the struct in bytes. |
| bool m_struct_laid_out; ///< True if the struct has been laid out and the layout is valid (that is, no new fields have been added since). |
| ConstString m_result_name; ///< The name of the result variable ($1, for example) |
| TypeFromUser m_object_pointer_type; ///< The type of the "this" variable, if one exists |
| }; |
| |
| std::unique_ptr<StructVars> m_struct_vars; |
| |
| //---------------------------------------------------------------------- |
| /// Activate struct variables |
| //---------------------------------------------------------------------- |
| void |
| EnableStructVars() |
| { |
| if (!m_struct_vars.get()) |
| m_struct_vars.reset(new struct StructVars); |
| } |
| |
| //---------------------------------------------------------------------- |
| /// Deallocate struct variables |
| //---------------------------------------------------------------------- |
| void |
| DisableStructVars() |
| { |
| m_struct_vars.reset(); |
| } |
| |
| //---------------------------------------------------------------------- |
| /// Get this parser's ID for use in extracting parser- and JIT-specific |
| /// data from persistent variables. |
| //---------------------------------------------------------------------- |
| uint64_t |
| GetParserID() |
| { |
| return (uint64_t)this; |
| } |
| |
| //------------------------------------------------------------------ |
| /// Given a target, find a data symbol that has the given name. |
| /// |
| /// @param[in] target |
| /// The target to use as the basis for the search. |
| /// |
| /// @param[in] name |
| /// The name as a plain C string. |
| /// |
| /// @param[in] module |
| /// The module to limit the search to. This can be NULL |
| /// |
| /// @return |
| /// The LLDB Symbol found, or NULL if none was found. |
| //------------------------------------------------------------------ |
| const Symbol * |
| FindGlobalDataSymbol (Target &target, |
| const ConstString &name, |
| Module *module = NULL); |
| |
| //------------------------------------------------------------------ |
| /// Given a target, find a variable that matches the given name and |
| /// type. |
| /// |
| /// @param[in] target |
| /// The target to use as a basis for finding the variable. |
| /// |
| /// @param[in] module |
| /// If non-NULL, the module to search. |
| /// |
| /// @param[in] name |
| /// The name as a plain C string. |
| /// |
| /// @param[in] namespace_decl |
| /// If non-NULL and module is non-NULL, the parent namespace. |
| /// |
| /// @param[in] type |
| /// The required type for the variable. This function may be called |
| /// during parsing, in which case we don't know its type; hence the |
| /// default. |
| /// |
| /// @return |
| /// The LLDB Variable found, or NULL if none was found. |
| //------------------------------------------------------------------ |
| lldb::VariableSP |
| FindGlobalVariable (Target &target, |
| lldb::ModuleSP &module, |
| const ConstString &name, |
| ClangNamespaceDecl *namespace_decl, |
| TypeFromUser *type = NULL); |
| |
| //------------------------------------------------------------------ |
| /// Get the value of a variable in a given execution context and return |
| /// the associated Types if needed. |
| /// |
| /// @param[in] var |
| /// The variable to evaluate. |
| /// |
| /// @param[out] var_location |
| /// The variable location value to fill in |
| /// |
| /// @param[out] found_type |
| /// The type of the found value, as it was found in the user process. |
| /// This is only useful when the variable is being inspected on behalf |
| /// of the parser, hence the default. |
| /// |
| /// @param[out] parser_type |
| /// The type of the found value, as it was copied into the parser's |
| /// AST context. This is only useful when the variable is being |
| /// inspected on behalf of the parser, hence the default. |
| /// |
| /// @param[in] decl |
| /// The Decl to be looked up. |
| /// |
| /// @return |
| /// Return true if the value was successfully filled in. |
| //------------------------------------------------------------------ |
| bool |
| GetVariableValue (lldb::VariableSP &var, |
| lldb_private::Value &var_location, |
| TypeFromUser *found_type = NULL, |
| TypeFromParser *parser_type = NULL); |
| |
| //------------------------------------------------------------------ |
| /// Use the NameSearchContext to generate a Decl for the given LLDB |
| /// Variable, and put it in the Tuple list. |
| /// |
| /// @param[in] context |
| /// The NameSearchContext to use when constructing the Decl. |
| /// |
| /// @param[in] var |
| /// The LLDB Variable that needs a Decl. |
| /// |
| /// @param[in] valobj |
| /// The LLDB ValueObject for that variable. |
| //------------------------------------------------------------------ |
| void |
| AddOneVariable (NameSearchContext &context, |
| lldb::VariableSP var, |
| lldb::ValueObjectSP valobj, |
| unsigned int current_id); |
| |
| //------------------------------------------------------------------ |
| /// Use the NameSearchContext to generate a Decl for the given |
| /// persistent variable, and put it in the list of found entities. |
| /// |
| /// @param[in] context |
| /// The NameSearchContext to use when constructing the Decl. |
| /// |
| /// @param[in] pvar |
| /// The persistent variable that needs a Decl. |
| /// |
| /// @param[in] current_id |
| /// The ID of the current invocation of FindExternalVisibleDecls |
| /// for logging purposes. |
| //------------------------------------------------------------------ |
| void |
| AddOneVariable (NameSearchContext &context, |
| lldb::ClangExpressionVariableSP &pvar_sp, |
| unsigned int current_id); |
| |
| //------------------------------------------------------------------ |
| /// Use the NameSearchContext to generate a Decl for the given LLDB |
| /// symbol (treated as a variable), and put it in the list of found |
| /// entities. |
| /// |
| /// @param[in] context |
| /// The NameSearchContext to use when constructing the Decl. |
| /// |
| /// @param[in] var |
| /// The LLDB Variable that needs a Decl. |
| //------------------------------------------------------------------ |
| void |
| AddOneGenericVariable (NameSearchContext &context, |
| const Symbol &symbol, |
| unsigned int current_id); |
| |
| //------------------------------------------------------------------ |
| /// Use the NameSearchContext to generate a Decl for the given |
| /// function. (Functions are not placed in the Tuple list.) Can |
| /// handle both fully typed functions and generic functions. |
| /// |
| /// @param[in] context |
| /// The NameSearchContext to use when constructing the Decl. |
| /// |
| /// @param[in] fun |
| /// The Function that needs to be created. If non-NULL, this is |
| /// a fully-typed function. |
| /// |
| /// @param[in] sym |
| /// The Symbol that corresponds to a function that needs to be |
| /// created with generic type (unitptr_t foo(...)). |
| //------------------------------------------------------------------ |
| void |
| AddOneFunction (NameSearchContext &context, |
| Function *fun, |
| Symbol *sym, |
| unsigned int current_id); |
| |
| //------------------------------------------------------------------ |
| /// Use the NameSearchContext to generate a Decl for the given |
| /// register. |
| /// |
| /// @param[in] context |
| /// The NameSearchContext to use when constructing the Decl. |
| /// |
| /// @param[in] reg_info |
| /// The information corresponding to that register. |
| //------------------------------------------------------------------ |
| void |
| AddOneRegister (NameSearchContext &context, |
| const RegisterInfo *reg_info, |
| unsigned int current_id); |
| |
| //------------------------------------------------------------------ |
| /// Use the NameSearchContext to generate a Decl for the given |
| /// type. (Types are not placed in the Tuple list.) |
| /// |
| /// @param[in] context |
| /// The NameSearchContext to use when constructing the Decl. |
| /// |
| /// @param[in] type |
| /// The type that needs to be created. |
| //------------------------------------------------------------------ |
| void |
| AddOneType (NameSearchContext &context, |
| TypeFromUser &type, |
| unsigned int current_id); |
| |
| //------------------------------------------------------------------ |
| /// Copy a C++ class type into the parser's AST context and add a |
| /// member function declaration to it for the expression. |
| /// |
| /// @param[in] type |
| /// The type that needs to be created. |
| //------------------------------------------------------------------ |
| |
| TypeFromParser |
| CopyClassType(TypeFromUser &type, |
| unsigned int current_id); |
| }; |
| |
| } // namespace lldb_private |
| |
| #endif // liblldb_ClangExpressionDeclMap_h_ |
