X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=gdb%2Flanguage.h;h=1ba0b9377e28dece0897b0f9b90dca1d3e6d9b66;hb=aa95b2d43883666937d31335d0178d2218d9c9aa;hp=4cf16c11540f88b9abba11f64703b2849399ea9f;hpb=1fb314aaa3142711e452e66c2dced781a4d1ef87;p=binutils-gdb.git diff --git a/gdb/language.h b/gdb/language.h index 4cf16c11540..1ba0b9377e2 100644 --- a/gdb/language.h +++ b/gdb/language.h @@ -1,6 +1,6 @@ /* Source-language-related definitions for GDB. - Copyright (C) 1991-2020 Free Software Foundation, Inc. + Copyright (C) 1991-2021 Free Software Foundation, Inc. Contributed by the Department of Computer Science at the State University of New York at Buffalo. @@ -42,16 +42,6 @@ class innermost_block_tracker; #define MAX_FORTRAN_DIMS 7 /* Maximum number of F77 array dims. */ -/* range_mode == - range_mode_auto: range_check set automatically to default of language. - range_mode_manual: range_check set manually by user. */ - -extern enum range_mode - { - range_mode_auto, range_mode_manual - } -range_mode; - /* range_check == range_check_on: Ranges are checked in GDB expressions, producing errors. range_check_warn: Ranges are checked, producing warnings. @@ -63,16 +53,6 @@ extern enum range_check } range_check; -/* case_mode == - case_mode_auto: case_sensitivity set upon selection of scope. - case_mode_manual: case_sensitivity set only by user. */ - -extern enum case_mode - { - case_mode_auto, case_mode_manual - } -case_mode; - /* array_ordering == array_row_major: Arrays are in row major order. array_column_major: Arrays are in column major order. */ @@ -109,23 +89,129 @@ enum macro_expansion struct language_arch_info { - /* Its primitive types. This is a vector ended by a NULL pointer. - These types can be specified by name in parsing types in - expressions, regardless of whether the program being debugged - actually defines such a type. */ - struct type **primitive_type_vector; + /* A default constructor. */ + language_arch_info () = default; + + DISABLE_COPY_AND_ASSIGN (language_arch_info); + + /* Set the default boolean type to be TYPE. If NAME is not nullptr then + before using TYPE a symbol called NAME will be looked up, and the type + of this symbol will be used instead. Should only be called once when + performing setup for a particular language in combination with a + particular gdbarch. */ + void set_bool_type (struct type *type, const char *name = nullptr) + { + gdb_assert (m_bool_type_default == nullptr); + gdb_assert (m_bool_type_name == nullptr); + gdb_assert (type != nullptr); + m_bool_type_default = type; + m_bool_type_name = name; + } + + /* Set the type to be used for characters within a string. Should only + be called once when performing setup for a particular language in + combination with a particular gdbarch. */ + void set_string_char_type (struct type *type) + { + gdb_assert (m_string_char_type == nullptr); + gdb_assert (type != nullptr); + m_string_char_type = type; + } + + /* Return the type for characters within a string. */ + struct type *string_char_type () const + { return m_string_char_type; } + + /* Return the type to be used for booleans. */ + struct type *bool_type () const; + + /* Add TYPE to the list of primitive types for this particular language, + with this OS/ABI combination. */ + void add_primitive_type (struct type *type) + { + gdb_assert (type != nullptr); + primitive_types_and_symbols.push_back (type_and_symbol (type)); + } + + /* Lookup a primitive type called NAME. Will return nullptr if no + matching type is found. */ + struct type *lookup_primitive_type (const char *name); + + /* Lookup a primitive type for which FILTER returns true. Will return + nullptr if no matching type is found. */ + struct type *lookup_primitive_type + (gdb::function_view filter); + + /* Lookup a primitive type called NAME and return the type as a symbol. + LANG is the language for which type is being looked up. */ + struct symbol *lookup_primitive_type_as_symbol (const char *name, + enum language lang); +private: + + /* A structure storing a type and a corresponding symbol. The type is + defined at construction time, while the symbol is lazily created only + when asked for, but is then cached for future use. */ + struct type_and_symbol + { + /* Constructor. */ + explicit type_and_symbol (struct type *type) + : m_type (type) + { /* Nothing. */ } + + /* Default move constructor. */ + type_and_symbol (type_and_symbol&&) = default; + + DISABLE_COPY_AND_ASSIGN (type_and_symbol); + + /* Return the type from this object. */ + struct type *type () const + { return m_type; } + + /* Create and return a symbol wrapping M_TYPE from this object. */ + struct symbol *symbol (enum language lang) + { + if (m_symbol == nullptr) + m_symbol = alloc_type_symbol (lang, m_type); + return m_symbol; + } + + private: + /* The type primitive type. */ + struct type *m_type = nullptr; + + /* A symbol wrapping M_TYPE, only created when first asked for. */ + struct symbol *m_symbol = nullptr; + + /* Helper function for type lookup as a symbol. Create the symbol + corresponding to type TYPE in language LANG. */ + static struct symbol *alloc_type_symbol (enum language lang, + struct type *type); + }; + + /* Lookup a type_and_symbol entry from the primitive_types_and_symbols + vector for a type matching NAME. Return a pointer to the + type_and_symbol object from the vector. This will return nullptr if + there is no type matching NAME found. */ + type_and_symbol *lookup_primitive_type_and_symbol (const char *name); + + /* Vector of the primitive types added through add_primitive_type. These + types can be specified by name in parsing types in expressions, + regardless of whether the program being debugged actually defines such + a type. - /* Symbol wrappers around primitive_type_vector, so that the symbol lookup - machinery can return them. */ - struct symbol **primitive_type_symbols; + Within the vector each type is paired with a lazily created symbol, + which can be fetched by the symbol lookup machinery, should they be + needed. */ + std::vector primitive_types_and_symbols; /* Type of elements of strings. */ - struct type *string_char_type; + struct type *m_string_char_type = nullptr; /* Symbol name of type to use as boolean type, if defined. */ - const char *bool_type_symbol; + const char *m_bool_type_name = nullptr; + /* Otherwise, this is the default boolean builtin type. */ - struct type *bool_type_default; + struct type *m_bool_type_default = nullptr; }; /* In a language (particularly C++) a function argument of an aggregate @@ -169,343 +255,398 @@ struct language_pass_by_ref_info bool destructible = true; }; -/* Structure tying together assorted information about a language. +/* Splitting strings into words. */ +extern const char *default_word_break_characters (void); - As we move over from the old structure based languages to a class - hierarchy of languages this structure will continue to contain a - mixture of both data and function pointers. +/* Base class from which all other language classes derive. */ - Once the class hierarchy of languages in place the first task is to - remove the function pointers from this structure and convert them into - member functions on the different language classes. +struct language_defn +{ + language_defn (enum language lang) + : la_language (lang) + { + /* We should only ever create one instance of each language. */ + gdb_assert (languages[lang] == nullptr); + languages[lang] = this; + } + + /* Which language this is. */ + + const enum language la_language; - The current plan it to keep the constant data that describes a language - in this structure, and have each language pass in an instance of this - structure at construction time. */ + /* Name of the language. */ -struct language_data + virtual const char *name () const = 0; + + /* Natural or official name of the language. */ + + virtual const char *natural_name () const = 0; + + /* Return a vector of file extensions for this language. The extension + must include the ".", like ".c". If this language doesn't need to + provide any filename extensions, this may be an empty vector (which is + the default). */ + + virtual const std::vector &filename_extensions () const { - /* Name of the language. */ + static const std::vector no_extensions; + return no_extensions; + } - const char *la_name; + /* Print the index of an element of an array. This default + implementation prints using C99 syntax. */ + + virtual void print_array_index (struct type *index_type, + LONGEST index_value, + struct ui_file *stream, + const value_print_options *options) const; + + /* Given a symbol VAR, the corresponding block VAR_BLOCK (if any) and a + stack frame id FRAME, read the value of the variable and return (pointer + to a) struct value containing the value. + + VAR_BLOCK is needed if there's a possibility for VAR to be outside + FRAME. This is what happens if FRAME correspond to a nested function + and VAR is defined in the outer function. If callers know that VAR is + located in FRAME or is global/static, NULL can be passed as VAR_BLOCK. + + Throw an error if the variable cannot be found. */ + + virtual struct value *read_var_value (struct symbol *var, + const struct block *var_block, + struct frame_info *frame) const; + + /* Return information about whether TYPE should be passed + (and returned) by reference at the language level. The default + implementation returns a LANGUAGE_PASS_BY_REF_INFO initialised in its + default state. */ - /* Natural or official name of the language. */ + virtual struct language_pass_by_ref_info pass_by_reference_info + (struct type *type) const + { + return {}; + } - const char *la_natural_name; + /* Return true if SYMBOL represents an entity that is not + supposed to be seen by the user. To be used to filter symbols + during printing. */ + virtual bool symbol_printing_suppressed (struct symbol *symbol) const + { + return false; + } - /* its symtab language-enum (defs.h). */ + /* The per-architecture (OS/ABI) language information. */ - enum language la_language; + virtual void language_arch_info (struct gdbarch *, + struct language_arch_info *) const = 0; - /* Default range checking. */ + /* Find the definition of the type with the given name. */ - enum range_check la_range_check; + virtual struct type *lookup_transparent_type (const char *name) const + { + return basic_lookup_transparent_type (name); + } - /* Default case sensitivity. */ - enum case_sensitivity la_case_sensitivity; + /* Find all symbols in the current program space matching NAME in + DOMAIN, according to this language's rules. - /* Multi-dimensional array ordering. */ - enum array_ordering la_array_ordering; + The search is done in BLOCK only. + The caller is responsible for iterating up through superblocks + if desired. - /* Style of macro expansion, if any, supported by this language. */ - enum macro_expansion la_macro_expansion; + For each one, call CALLBACK with the symbol. If CALLBACK + returns false, the iteration ends at that point. - /* A NULL-terminated array of file extensions for this language. - The extension must include the ".", like ".c". If this - language doesn't need to provide any filename extensions, this - may be NULL. */ + This field may not be NULL. If the language does not need any + special processing here, 'iterate_over_symbols' should be + used as the definition. */ + virtual bool iterate_over_symbols + (const struct block *block, const lookup_name_info &name, + domain_enum domain, + gdb::function_view callback) const + { + return ::iterate_over_symbols (block, name, domain, callback); + } - const char *const *la_filename_extensions; + /* Return a pointer to the function that should be used to match a + symbol name against LOOKUP_NAME, according to this language's + rules. The matching algorithm depends on LOOKUP_NAME. For + example, on Ada, the matching algorithm depends on the symbol + name (wild/full/verbatim matching), and on whether we're doing + a normal lookup or a completion match lookup. - /* Definitions related to expression printing, prefixifying, and - dumping. */ + As Ada wants to capture symbol matching for all languages in some + cases, then this method is a non-overridable interface. Languages + should override GET_SYMBOL_NAME_MATCHER_INNER if they need to. */ - const struct exp_descriptor *la_exp_desc; + symbol_name_matcher_ftype *get_symbol_name_matcher + (const lookup_name_info &lookup_name) const; - /* Parser function. */ + /* If this language allows compilation from the gdb command line, + then this method will return an instance of struct gcc_context + appropriate to the language. If compilation for this language is + generally supported, but something goes wrong then an exception + is thrown. If compilation is not supported for this language + then this method returns NULL. */ - int (*la_parser) (struct parser_state *); + virtual std::unique_ptr get_compile_instance () const; - /* Given an expression *EXPP created by prefixifying the result of - la_parser, perform any remaining processing necessary to complete - its translation. *EXPP may change; la_post_parser is responsible - for releasing its previous contents, if necessary. If - VOID_CONTEXT_P, then no value is expected from the expression. - If COMPLETING is non-zero, then the expression has been parsed - for completion, not evaluation. */ + /* This method must be overridden if 'get_compile_instance' is + overridden. - void (*la_post_parser) (expression_up *expp, int void_context_p, - int completing, innermost_block_tracker *tracker); + This takes the user-supplied text and returns a new bit of code + to compile. - void (*la_printchar) (int ch, struct type *chtype, - struct ui_file * stream); + INST is the compiler instance being used. + INPUT is the user's input text. + GDBARCH is the architecture to use. + EXPR_BLOCK is the block in which the expression is being + parsed. + EXPR_PC is the PC at which the expression is being parsed. */ - void (*la_printstr) (struct ui_file * stream, struct type *elttype, - const gdb_byte *string, unsigned int length, - const char *encoding, int force_ellipses, - const struct value_print_options *); + virtual std::string compute_program (compile_instance *inst, + const char *input, + struct gdbarch *gdbarch, + const struct block *expr_block, + CORE_ADDR expr_pc) const + { + gdb_assert_not_reached ("language_defn::compute_program"); + } - void (*la_emitchar) (int ch, struct type *chtype, - struct ui_file * stream, int quoter); + /* Hash the given symbol search name. */ + virtual unsigned int search_name_hash (const char *name) const; - /* Print a type using syntax appropriate for this language. */ + /* Demangle a symbol according to this language's rules. Unlike + la_demangle, this does not take any options. - void (*la_print_type) (struct type *, const char *, struct ui_file *, int, - int, const struct type_print_options *); + *DEMANGLED will be set by this function. - /* Print a typedef using syntax appropriate for this language. - TYPE is the underlying type. NEW_SYMBOL is the symbol naming - the type. STREAM is the output stream on which to print. */ + If this function returns false, then *DEMANGLED must always be set + to NULL. - void (*la_print_typedef) (struct type *type, struct symbol *new_symbol, - struct ui_file *stream); + If this function returns true, the implementation may set this to + a xmalloc'd string holding the demangled form. However, it is + not required to. The string, if any, is owned by the caller. - /* Print a value using syntax appropriate for this language. - RECURSE is the recursion depth. It is zero-based. */ + The resulting string should be of the form that will be + installed into a symbol. */ + virtual bool sniff_from_mangled_name + (const char *mangled, gdb::unique_xmalloc_ptr *demangled) const + { + *demangled = nullptr; + return false; + } - void (*la_value_print_inner) (struct value *, struct ui_file *, - int recurse, - const struct value_print_options *); + /* Return demangled language symbol version of MANGLED, or NULL. */ + virtual gdb::unique_xmalloc_ptr demangle_symbol (const char *mangled, + int options) const + { + return nullptr; + } - /* Print a top-level value using syntax appropriate for this language. */ + /* Print TYPE to STREAM using syntax appropriate for this language. + LEVEL is the depth to indent lines by. VARSTRING, if not NULL or the + empty string, is the name of a variable and TYPE should be printed in + the form of a declaration of a variable named VARSTRING. */ - void (*la_value_print) (struct value *, struct ui_file *, - const struct value_print_options *); + virtual void print_type (struct type *type, const char *varstring, + struct ui_file *stream, int show, int level, + const struct type_print_options *flags) const = 0; - /* PC is possibly an unknown languages trampoline. - If that PC falls in a trampoline belonging to this language, - return the address of the first pc in the real function, or 0 - if it isn't a language tramp for this language. */ - CORE_ADDR (*skip_trampoline) (struct frame_info *, CORE_ADDR); + /* PC is possibly an unknown languages trampoline. + If that PC falls in a trampoline belonging to this language, return + the address of the first pc in the real function, or 0 if it isn't a + language tramp for this language. */ + virtual CORE_ADDR skip_trampoline (struct frame_info *fi, CORE_ADDR pc) const + { + return (CORE_ADDR) 0; + } - /* Now come some hooks for lookup_symbol. */ + /* Return class name of a mangled method name or NULL. */ + virtual char *class_name_from_physname (const char *physname) const + { + return nullptr; + } - /* If this is non-NULL, specifies the name that of the implicit - local variable that refers to the current object instance. */ + /* The list of characters forming word boundaries. */ + virtual const char *word_break_characters (void) const + { + return default_word_break_characters (); + } - const char *la_name_of_this; + /* Add to the completion tracker all symbols which are possible + completions for TEXT. WORD is the entire command on which the + completion is being made. If CODE is TYPE_CODE_UNDEF, then all + symbols should be examined; otherwise, only STRUCT_DOMAIN symbols + whose type has a code of CODE should be matched. */ + + virtual void collect_symbol_completion_matches + (completion_tracker &tracker, + complete_symbol_mode mode, + symbol_name_match_type name_match_type, + const char *text, + const char *word, + enum type_code code) const + { + return default_collect_symbol_completion_matches_break_on + (tracker, mode, name_match_type, text, word, "", code); + } - /* True if the symbols names should be stored in GDB's data structures - for minimal/partial/full symbols using their linkage (aka mangled) - form; false if the symbol names should be demangled first. + /* This is a function that lookup_symbol will call when it gets to + the part of symbol lookup where C looks up static and global + variables. This default implements the basic C lookup rules. */ - Most languages implement symbol lookup by comparing the demangled - names, in which case it is advantageous to store that information - already demangled, and so would set this field to false. + virtual struct block_symbol lookup_symbol_nonlocal + (const char *name, + const struct block *block, + const domain_enum domain) const; - On the other hand, some languages have opted for doing symbol - lookups by comparing mangled names instead, for reasons usually - specific to the language. Those languages should set this field - to true. + /* Return an expression that can be used for a location + watchpoint. TYPE is a pointer type that points to the memory + to watch, and ADDR is the address of the watched memory. */ + virtual gdb::unique_xmalloc_ptr watch_location_expression + (struct type *type, CORE_ADDR addr) const; - And finally, other languages such as C or Asm do not have - the concept of mangled vs demangled name, so those languages - should set this field to true as well, to prevent any accidental - demangling through an unrelated language's demangler. */ + /* List of all known languages. */ + static const struct language_defn *languages[nr_languages]; - const bool la_store_sym_names_in_linkage_form_p; + /* Print a top-level value using syntax appropriate for this language. */ + virtual void value_print (struct value *val, struct ui_file *stream, + const struct value_print_options *options) const; - /* This is a function that lookup_symbol will call when it gets to - the part of symbol lookup where C looks up static and global - variables. */ + /* Print a value using syntax appropriate for this language. RECURSE is + the recursion depth. It is zero-based. */ + virtual void value_print_inner + (struct value *val, struct ui_file *stream, int recurse, + const struct value_print_options *options) const; - struct block_symbol (*la_lookup_symbol_nonlocal) - (const struct language_defn *, - const char *, - const struct block *, - const domain_enum); + /* Parser function. */ - /* Find the definition of the type with the given name. */ - struct type *(*la_lookup_transparent_type) (const char *); + virtual int parser (struct parser_state *ps) const; - /* Return demangled language symbol, or NULL. */ - char *(*la_demangle) (const char *mangled, int options); + /* Print the character CH (of type CHTYPE) on STREAM as part of the + contents of a literal string whose delimiter is QUOTER. */ - /* Demangle a symbol according to this language's rules. Unlike - la_demangle, this does not take any options. + virtual void emitchar (int ch, struct type *chtype, + struct ui_file *stream, int quoter) const; - *DEMANGLED will be set by this function. - - If this function returns 0, then *DEMANGLED must always be set - to NULL. + virtual void printchar (int ch, struct type *chtype, + struct ui_file * stream) const; - If this function returns 1, the implementation may set this to - a xmalloc'd string holding the demangled form. However, it is - not required to. The string, if any, is owned by the caller. +/* Print the character string STRING, printing at most LENGTH characters. + Printing stops early if the number hits print_max; repeat counts + are printed as appropriate. Print ellipses at the end if we + had to stop before printing LENGTH characters, or if FORCE_ELLIPSES. */ - The resulting string should be of the form that will be - installed into a symbol. */ - int (*la_sniff_from_mangled_name) (const char *mangled, char **demangled); + virtual void printstr (struct ui_file *stream, struct type *elttype, + const gdb_byte *string, unsigned int length, + const char *encoding, int force_ellipses, + const struct value_print_options *options) const; - /* Return class name of a mangled method name or NULL. */ - char *(*la_class_name_from_physname) (const char *physname); - /* Table for printing expressions. */ + /* Print a typedef using syntax appropriate for this language. + TYPE is the underlying type. NEW_SYMBOL is the symbol naming + the type. STREAM is the output stream on which to print. */ - const struct op_print *la_op_print_tab; + virtual void print_typedef (struct type *type, struct symbol *new_symbol, + struct ui_file *stream) const; - /* Zero if the language has first-class arrays. True if there are no - array values, and array objects decay to pointers, as in C. */ + /* Return true if TYPE is a string type. */ + virtual bool is_string_type_p (struct type *type) const; - char c_style_arrays; + /* Return a string that is used by the 'set print max-depth' setting. + When GDB replaces a struct or union (during value printing) that is + "too deep" this string is displayed instead. The default value here + suits most languages. If overriding then the string here should + ideally be similar in style to the default; an opener, three '.', and + a closer. */ - /* Index to use for extracting the first element of a string. */ - char string_lower_bound; + virtual const char *struct_too_deep_ellipsis () const + { return "{...}"; } - /* The list of characters forming word boundaries. */ - const char *(*la_word_break_characters) (void); - - /* Add to the completion tracker all symbols which are possible - completions for TEXT. WORD is the entire command on which the - completion is being made. If CODE is TYPE_CODE_UNDEF, then all - symbols should be examined; otherwise, only STRUCT_DOMAIN - symbols whose type has a code of CODE should be matched. */ - void (*la_collect_symbol_completion_matches) - (completion_tracker &tracker, - complete_symbol_mode mode, - symbol_name_match_type match_type, - const char *text, - const char *word, - enum type_code code); - - /* Return an expression that can be used for a location - watchpoint. TYPE is a pointer type that points to the memory - to watch, and ADDR is the address of the watched memory. */ - gdb::unique_xmalloc_ptr (*la_watch_location_expression) - (struct type *type, CORE_ADDR addr); - - /* Return a pointer to the function that should be used to match a - symbol name against LOOKUP_NAME, according to this language's - rules. The matching algorithm depends on LOOKUP_NAME. For - example, on Ada, the matching algorithm depends on the symbol - name (wild/full/verbatim matching), and on whether we're doing - a normal lookup or a completion match lookup. - - This field may be NULL, in which case - default_symbol_name_matcher is used to perform the - matching. */ - symbol_name_matcher_ftype *(*la_get_symbol_name_matcher) - (const lookup_name_info &); - - /* Find all symbols in the current program space matching NAME in - DOMAIN, according to this language's rules. - - The search is done in BLOCK only. - The caller is responsible for iterating up through superblocks - if desired. - - For each one, call CALLBACK with the symbol. If CALLBACK - returns false, the iteration ends at that point. - - This field may not be NULL. If the language does not need any - special processing here, 'iterate_over_symbols' should be - used as the definition. */ - bool (*la_iterate_over_symbols) - (const struct block *block, const lookup_name_info &name, - domain_enum domain, - gdb::function_view callback); - - /* Hash the given symbol search name. Use - default_search_name_hash if no special treatment is - required. */ - unsigned int (*la_search_name_hash) (const char *name); - - /* Various operations on varobj. */ - const struct lang_varobj_ops *la_varobj_ops; - - /* If this language allows compilation from the gdb command line, - this method should be non-NULL. When called it should return - an instance of struct gcc_context appropriate to the language. - When defined this method must never return NULL; instead it - should throw an exception on failure. The returned compiler - instance is owned by its caller and must be deallocated by - calling its 'destroy' method. */ - - compile_instance *(*la_get_compile_instance) (void); - - /* This method must be defined if 'la_get_gcc_context' is defined. - If 'la_get_gcc_context' is not defined, then this method is - ignored. - - This takes the user-supplied text and returns a new bit of code - to compile. - - INST is the compiler instance being used. - INPUT is the user's input text. - GDBARCH is the architecture to use. - EXPR_BLOCK is the block in which the expression is being - parsed. - EXPR_PC is the PC at which the expression is being parsed. */ - - std::string (*la_compute_program) (compile_instance *inst, - const char *input, - struct gdbarch *gdbarch, - const struct block *expr_block, - CORE_ADDR expr_pc); + /* If this returns non-NULL then the string returned specifies the name + of the implicit local variable that refers to the current object + instance. Return NULL (the default) for languages that have no name + for the current object instance. */ - /* Return true if TYPE is a string type. */ - bool (*la_is_string_type_p) (struct type *type); + virtual const char *name_of_this () const + { return nullptr; } - /* This string is used by the 'set print max-depth' setting. When GDB - replaces a struct or union (during value printing) that is "too - deep" this string is displayed instead. */ - const char *la_struct_too_deep_ellipsis; + /* Return false if the language has first-class arrays. Return true if + there are no array values, and array objects decay to pointers, as in + C. The default is true as currently most supported languages behave + in this manner. */ - }; + virtual bool c_style_arrays_p () const + { return true; } -/* Base class from which all other language classes derive. */ + /* Return the index to use for extracting the first element of a string, + or as the lower bound when creating a new string. The default of + choosing 0 or 1 based on C_STYLE_ARRAYS_P works for all currently + supported languages except Modula-2. */ -struct language_defn : language_data -{ - language_defn (enum language lang, const language_data &init_data) - : language_data (init_data) - { - /* We should only ever create one instance of each language. */ - gdb_assert (languages[lang] == nullptr); - languages[lang] = this; - } + virtual char string_lower_bound () const + { return c_style_arrays_p () ? 0 : 1; } - /* Print the index of an element of an array. This default - implementation prints using C99 syntax. */ + /* Returns true if the symbols names should be stored in GDB's data + structures for minimal/partial/full symbols using their linkage (aka + mangled) form; false if the symbol names should be demangled first. - virtual void print_array_index (struct type *index_type, - LONGEST index_value, - struct ui_file *stream, - const value_print_options *options) const; + Most languages implement symbol lookup by comparing the demangled + names, in which case it is advantageous to store that information + already demangled, and so would return false, which is the default. - /* Given a symbol VAR, the corresponding block VAR_BLOCK (if any) and a - stack frame id FRAME, read the value of the variable and return (pointer - to a) struct value containing the value. + On the other hand, some languages have opted for doing symbol lookups + by comparing mangled names instead, for reasons usually specific to + the language. Those languages should override this function and + return true. - VAR_BLOCK is needed if there's a possibility for VAR to be outside - FRAME. This is what happens if FRAME correspond to a nested function - and VAR is defined in the outer function. If callers know that VAR is - located in FRAME or is global/static, NULL can be passed as VAR_BLOCK. + And finally, other languages such as C or Asm do not have the concept + of mangled vs demangled name, so those languages should also override + this function and return true, to prevent any accidental demangling + through an unrelated language's demangler. */ - Throw an error if the variable cannot be found. */ + virtual bool store_sym_names_in_linkage_form_p () const + { return false; } - virtual struct value *read_var_value (struct symbol *var, - const struct block *var_block, - struct frame_info *frame) const; + /* Default range checking preference. The return value from this + function provides the automatic setting for 'set check range'. As a + consequence a user is free to override this setting if they want. */ - /* Return information about whether TYPE should be passed - (and returned) by reference at the language level. The default - implementation returns a LANGUAGE_PASS_BY_REF_INFO initialised in its - default state. */ + virtual bool range_checking_on_by_default () const + { return false; } - virtual struct language_pass_by_ref_info pass_by_reference_info - (struct type *type) const - { - return {}; - } + /* Is this language case sensitive? The return value from this function + provides the automativ setting for 'set case-sensitive', as a + consequence, a user is free to override this setting if they want. */ - /* The per-architecture (OS/ABI) language information. */ + virtual enum case_sensitivity case_sensitivity () const + { return case_sensitive_on; } - virtual void language_arch_info (struct gdbarch *, - struct language_arch_info *) const = 0; - /* List of all known languages. */ - static const struct language_defn *languages[nr_languages]; + /* Multi-dimensional array ordering. */ + + virtual enum array_ordering array_ordering () const + { return array_row_major; } + + /* Style of macro expansion, if any, supported by this language. The + default is no macro expansion. */ + + virtual enum macro_expansion macro_expansion () const + { return macro_expansion_no; } + + /* Return a structure containing various operations on varobj specific + for this language. */ + + virtual const struct lang_varobj_ops *varobj_ops () const; + +protected: + + /* This is the overridable part of the GET_SYMBOL_NAME_MATCHER method. + See that method for a description of the arguments. */ + + virtual symbol_name_matcher_ftype *get_symbol_name_matcher_inner + (const lookup_name_info &lookup_name) const; }; /* Pointer to the language_defn for our current language. This pointer @@ -547,19 +688,39 @@ extern enum language_mode } language_mode; +/* Return the type that should be used for booleans for language L in + GDBARCH. */ + struct type *language_bool_type (const struct language_defn *l, struct gdbarch *gdbarch); +/* Return the type that should be used for characters within a string for + language L in GDBARCH. */ + struct type *language_string_char_type (const struct language_defn *l, struct gdbarch *gdbarch); -/* Look up type NAME in language L, and return its definition for architecture - GDBARCH. Returns NULL if not found. */ +/* Look up a type from the set of OS/ABI specific types defined in + GDBARCH for language L. NAME is used for selecting the matching + type, and is passed through to the corresponding + lookup_primitive_type member function inside the language_arch_info + class. */ struct type *language_lookup_primitive_type (const struct language_defn *l, struct gdbarch *gdbarch, const char *name); +/* Look up a type from the set of OS/ABI specific types defined in + GDBARCH for language L. FILTER is used for selecting the matching + type, and is passed through to the corresponding + lookup_primitive_type member function inside the language_arch_info + class. */ + +struct type *language_lookup_primitive_type + (const struct language_defn *la, + struct gdbarch *gdbarch, + gdb::function_view filter); + /* Wrapper around language_lookup_primitive_type to return the corresponding symbol. */ @@ -581,7 +742,10 @@ struct symbol * (LANG)->la_language == language_cplus || \ (LANG)->la_language == language_objc) -extern void language_info (int); +/* Print out the current language settings: language, range and + type checking. */ + +extern void language_info (); extern enum language set_language (enum language); @@ -592,28 +756,13 @@ extern enum language set_language (enum language); with the "set language" command. */ #define LA_PRINT_TYPE(type,varstring,stream,show,level,flags) \ - (current_language->la_print_type(type,varstring,stream,show,level,flags)) - -#define LA_PRINT_TYPEDEF(type,new_symbol,stream) \ - (current_language->la_print_typedef(type,new_symbol,stream)) - -#define LA_VALUE_PRINT(val,stream,options) \ - (current_language->la_value_print(val,stream,options)) + (current_language->print_type(type,varstring,stream,show,level,flags)) #define LA_PRINT_CHAR(ch, type, stream) \ - (current_language->la_printchar(ch, type, stream)) + (current_language->printchar (ch, type, stream)) #define LA_PRINT_STRING(stream, elttype, string, length, encoding, force_ellipses, options) \ - (current_language->la_printstr(stream, elttype, string, length, \ - encoding, force_ellipses,options)) -#define LA_EMIT_CHAR(ch, type, stream, quoter) \ - (current_language->la_emitchar(ch, type, stream, quoter)) - -#define LA_PRINT_ARRAY_INDEX(index_type, index_value, stream, options) \ - (current_language->print_array_index(index_type, index_value, stream, \ - options)) - -#define LA_ITERATE_OVER_SYMBOLS(BLOCK, NAME, DOMAIN, CALLBACK) \ - (current_language->la_iterate_over_symbols (BLOCK, NAME, DOMAIN, CALLBACK)) + (current_language->printstr (stream, elttype, string, length, \ + encoding, force_ellipses,options)) /* Test a character to decide whether it can be printed in literal form or needs to be printed in another representation. For example, @@ -626,22 +775,10 @@ extern enum language set_language (enum language); && ((c) < 0x7F || (c) >= 0xA0) \ && (!sevenbit_strings || (c) < 0x80)) -/* Type predicates */ - -extern int pointer_type (struct type *); - -/* Return true if TYPE is a string type, otherwise return false. This - default implementation only detects TYPE_CODE_STRING. */ -extern bool default_is_string_type_p (struct type *type); - /* Error messages */ extern void range_error (const char *, ...) ATTRIBUTE_PRINTF (1, 2); -/* Data: Does this value represent "truth" to the current language? */ - -extern int value_true (struct value *); - /* Misc: The string representing a particular enum language. */ extern enum language language_enum (const char *str); @@ -655,51 +792,19 @@ extern const char *language_str (enum language); extern CORE_ADDR skip_language_trampoline (struct frame_info *, CORE_ADDR pc); /* Return demangled language symbol, or NULL. */ -extern char *language_demangle (const struct language_defn *current_language, - const char *mangled, int options); - -/* A wrapper for la_sniff_from_mangled_name. The arguments and result - are as for the method. */ - -extern int language_sniff_from_mangled_name (const struct language_defn *lang, - const char *mangled, - char **demangled); - -/* Return class name from physname, or NULL. */ -extern char *language_class_name_from_physname (const struct language_defn *, - const char *physname); - -/* Splitting strings into words. */ -extern const char *default_word_break_characters (void); +extern gdb::unique_xmalloc_ptr language_demangle + (const struct language_defn *current_language, + const char *mangled, int options); /* Return information about whether TYPE should be passed (and returned) by reference at the language level. */ struct language_pass_by_ref_info language_pass_by_reference (struct type *type); -/* The default implementation of la_print_typedef. */ -void default_print_typedef (struct type *type, struct symbol *new_symbol, - struct ui_file *stream); - -/* Default name hashing function. */ - -/* Produce an unsigned hash value from SEARCH_NAME that is consistent - with strcmp_iw, strcmp, and, at least on Ada symbols, wild_match. - That is, two identifiers equivalent according to any of those three - comparison operators hash to the same value. */ -extern unsigned int default_search_name_hash (const char *search_name); - void c_get_string (struct value *value, gdb::unique_xmalloc_ptr *buffer, int *length, struct type **char_type, const char **charset); -/* The default implementation of la_symbol_name_matcher. Matches with - strncmp_iw. */ -extern bool default_symbol_name_matcher - (const char *symbol_search_name, - const lookup_name_info &lookup_name, - completion_match_result *comp_match_res); - /* Get LANG's symbol_name_matcher method for LOOKUP_NAME. Returns default_symbol_name_matcher if not set. LANG is used as a hint; the function may ignore it depending on the current language and