X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Flanguage.h;h=14d6fac30371313efc70c5c7316c751ff838b52a;hb=c1b5c1ebc938b6dc0277363b8c47d75b0b5a621f;hp=aaefb036383a059b294eed6bca4712ddd2e50946;hpb=be759fcf73cbf7ac59863c57389cd97c70c09a47;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/language.h b/gdb/language.h index aaefb03638..14d6fac303 100644 --- a/gdb/language.h +++ b/gdb/language.h @@ -1,7 +1,6 @@ /* Source-language-related definitions for GDB. - Copyright (C) 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2000, 2003, 2004, - 2007, 2008, 2009, 2010 Free Software Foundation, Inc. + Copyright (C) 1991-2019 Free Software Foundation, Inc. Contributed by the Department of Computer Science at the State University of New York at Buffalo. @@ -24,15 +23,24 @@ #if !defined (LANGUAGE_H) #define LANGUAGE_H 1 -/* Forward decls for prototypes */ +#include "symtab.h" +#include "gdbsupport/function-view.h" +#include "expression.h" + +/* Forward decls for prototypes. */ struct value; struct objfile; struct frame_info; -struct expression; struct ui_file; struct value_print_options; +struct type_print_options; +struct lang_varobj_ops; +struct parser_state; +class compile_instance; +struct completion_match_for_lcd; +class innermost_block_tracker; -#define MAX_FORTRAN_DIMS 7 /* Maximum number of F77 array dims */ +#define MAX_FORTRAN_DIMS 7 /* Maximum number of F77 array dims. */ /* range_mode == range_mode_auto: range_check set automatically to default of language. @@ -55,29 +63,8 @@ extern enum range_check } range_check; -/* type_mode == - type_mode_auto: type_check set automatically to default of language - type_mode_manual: type_check set manually by user. */ - -extern enum type_mode - { - type_mode_auto, type_mode_manual - } -type_mode; - -/* type_check == - type_check_on: Types are checked in GDB expressions, producing errors. - type_check_warn: Types are checked, producing warnings. - type_check_off: Types are not checked in GDB expressions. */ - -extern enum type_check - { - type_check_off, type_check_warn, type_check_on - } -type_check; - /* case_mode == - case_mode_auto: case_sensitivity set upon selection of scope + case_mode_auto: case_sensitivity set upon selection of scope. case_mode_manual: case_sensitivity set only by user. */ extern enum case_mode @@ -87,8 +74,8 @@ extern enum case_mode case_mode; /* array_ordering == - array_row_major: Arrays are in row major order - array_column_major: Arrays are in column major order.*/ + array_row_major: Arrays are in row major order. + array_column_major: Arrays are in column major order. */ extern enum array_ordering { @@ -98,8 +85,8 @@ array_ordering; /* case_sensitivity == - case_sensitive_on: Case sensitivity in name matching is used - case_sensitive_off: Case sensitivity in name matching is not used */ + case_sensitive_on: Case sensitivity in name matching is used. + case_sensitive_off: Case sensitivity in name matching is not used. */ extern enum case_sensitivity { @@ -109,8 +96,8 @@ case_sensitivity; /* macro_expansion == - macro_expansion_no: No macro expansion is available - macro_expansion_c: C-like macro expansion is available */ + macro_expansion_no: No macro expansion is available. + macro_expansion_c: C-like macro expansion is available. */ enum macro_expansion { @@ -127,7 +114,12 @@ struct language_arch_info expressions, regardless of whether the program being debugged actually defines such a type. */ struct type **primitive_type_vector; - /* Type of elements of strings. */ + + /* Symbol wrappers around primitive_type_vector, so that the symbol lookup + machinery can return them. */ + struct symbol **primitive_type_symbols; + + /* Type of elements of strings. */ struct type *string_char_type; /* Symbol name of type to use as boolean type, if defined. */ @@ -140,53 +132,60 @@ struct language_arch_info struct language_defn { - /* Name of the language */ + /* Name of the language. */ - char *la_name; + const char *la_name; - /* its symtab language-enum (defs.h) */ + /* Natural or official name of the language. */ - enum language la_language; + const char *la_natural_name; - /* Default range checking */ + /* its symtab language-enum (defs.h). */ - enum range_check la_range_check; + enum language la_language; - /* Default type checking */ + /* Default range checking. */ - enum type_check la_type_check; + enum range_check la_range_check; - /* Default case sensitivity */ + /* Default case sensitivity. */ enum case_sensitivity la_case_sensitivity; - /* Multi-dimensional array ordering */ + /* Multi-dimensional array ordering. */ enum array_ordering la_array_ordering; /* Style of macro expansion, if any, supported by this language. */ enum macro_expansion la_macro_expansion; - /* Definitions related to expression printing, prefixifying, and - dumping */ + /* 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. */ - const struct exp_descriptor *la_exp_desc; + const char *const *la_filename_extensions; - /* Parser function. */ + /* Definitions related to expression printing, prefixifying, and + dumping. */ - int (*la_parser) (void); + const struct exp_descriptor *la_exp_desc; - /* Parser error function */ + /* Parser function. */ - void (*la_error) (char *); + int (*la_parser) (struct parser_state *); /* 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. */ + 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. */ - void (*la_post_parser) (struct expression ** expp, int void_context_p); + void (*la_post_parser) (expression_up *expp, int void_context_p, + int completing, innermost_block_tracker *tracker); - void (*la_printchar) (int ch, struct type *chtype, struct ui_file * stream); + void (*la_printchar) (int ch, struct type *chtype, + struct ui_file * stream); void (*la_printstr) (struct ui_file * stream, struct type *elttype, const gdb_byte *string, unsigned int length, @@ -196,10 +195,10 @@ struct language_defn void (*la_emitchar) (int ch, struct type *chtype, struct ui_file * stream, int quoter); - /* Print a type using syntax appropriate for this language. */ + /* Print a type using syntax appropriate for this language. */ - void (*la_print_type) (struct type *, char *, struct ui_file *, int, - int); + void (*la_print_type) (struct type *, const char *, struct ui_file *, int, + int, const struct type_print_options *); /* Print a typedef using syntax appropriate for this language. TYPE is the underlying type. NEW_SYMBOL is the symbol naming @@ -208,16 +207,49 @@ struct language_defn void (*la_print_typedef) (struct type *type, struct symbol *new_symbol, struct ui_file *stream); - /* Print a value using syntax appropriate for this language. */ + /* Print a value using syntax appropriate for this language. + + TYPE is the type of the sub-object to be printed. - int (*la_val_print) (struct type *, const gdb_byte *, int, CORE_ADDR, - struct ui_file *, int, - const struct value_print_options *); + EMBEDDED_OFFSET is the offset into the outermost object of the + sub-object represented by TYPE. This is the object which this + call should print. Note that the enclosing type is not + available. + + ADDRESS is the address in the inferior of the enclosing object. + + STREAM is the stream on which the value is to be printed. - /* Print a top-level value using syntax appropriate for this language. */ + RECURSE is the recursion depth. It is zero-based. - int (*la_value_print) (struct value *, struct ui_file *, - const struct value_print_options *); + OPTIONS are the formatting options to be used when + printing. */ + + void (*la_val_print) (struct type *type, + int embedded_offset, CORE_ADDR address, + struct ui_file *stream, int recurse, + struct value *val, + const struct value_print_options *options); + + /* Print a top-level value using syntax appropriate for this language. */ + + void (*la_value_print) (struct value *, struct ui_file *, + const struct value_print_options *); + + /* 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. */ + + struct value *(*la_read_var_value) (struct symbol *var, + const struct block *var_block, + struct frame_info *frame); /* PC is possibly an unknown languages trampoline. If that PC falls in a trampoline belonging to this language, @@ -230,16 +262,37 @@ struct language_defn /* If this is non-NULL, specifies the name that of the implicit local variable that refers to the current object instance. */ - char *la_name_of_this; + const char *la_name_of_this; + + /* 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. + + 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. + + 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. + + 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. */ + + const bool la_store_sym_names_in_linkage_form_p; /* 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. */ - struct symbol *(*la_lookup_symbol_nonlocal) (const char *, - const char *, - const struct block *, - const domain_enum); + struct block_symbol (*la_lookup_symbol_nonlocal) + (const struct language_defn *, + const char *, + const struct block *, + const domain_enum); /* Find the definition of the type with the given name. */ struct type *(*la_lookup_transparent_type) (const char *); @@ -247,28 +300,52 @@ struct language_defn /* Return demangled language symbol, or NULL. */ char *(*la_demangle) (const char *mangled, int options); + /* Demangle a symbol according to this language's rules. Unlike + la_demangle, this does not take any options. + + *DEMANGLED will be set by this function. + + If this function returns 0, then *DEMANGLED must always be set + to NULL. + + 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. + + 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); + /* Return class name of a mangled method name or NULL. */ char *(*la_class_name_from_physname) (const char *physname); - /* Table for printing expressions */ + /* Table for printing expressions. */ const struct op_print *la_op_print_tab; /* Zero if the language has first-class arrays. True if there are no - array values, and array objects decay to pointers, as in C. */ + array values, and array objects decay to pointers, as in C. */ char c_style_arrays; - /* Index to use for extracting the first element of a string. */ + /* Index to use for extracting the first element of a string. */ char string_lower_bound; /* The list of characters forming word boundaries. */ - char *(*la_word_break_characters) (void); - - /* Should return a NULL terminated array of all symbols which - are possible completions for TEXT. WORD is the entire command - on which the completion is being made. */ - char **(*la_make_symbol_completion_list) (char *text, char *word); + 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); /* The per-architecture (OS/ABI) language information. */ void (*la_language_arch_info) (struct gdbarch *, @@ -283,28 +360,91 @@ struct language_defn reference at the language level. */ int (*la_pass_by_reference) (struct type *type); - /* Obtain a string from the inferior, storing it in a newly allocated - buffer in BUFFER, which should be freed by the caller. If the - in- and out-parameter *LENGTH is specified at -1, the string is - read until a null character of the appropriate width is found - - otherwise the string is read to the length of characters specified. - On completion, *LENGTH will hold the size of the string in characters. - If a *LENGTH of -1 was specified it will count only actual - characters, excluding any eventual terminating null character. - Otherwise *LENGTH will include all characters - including any nulls. - CHARSET will hold the encoding used in the string. */ - void (*la_get_string) (struct value *value, gdb_byte **buffer, int *length, - struct type **chartype, const char **charset); - - /* Add fields above this point, so the magic number is always last. */ - /* Magic number for compat checking */ - - long la_magic; + /* 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); + + /* Return true if TYPE is a string type. */ + bool (*la_is_string_type_p) (struct type *type); + + /* 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; }; -#define LANG_MAGIC 910823L - /* Pointer to the language_defn for our current language. This pointer always points to *some* valid struct; it can be used without checking it for validity. @@ -328,6 +468,11 @@ extern const struct language_defn *current_language; extern const struct language_defn *expected_language; +/* Warning issued when current_language and the language of the current + frame do not match. */ + +extern const char lang_frame_mismatch_warn[]; + /* language_mode == language_mode_auto: current_language automatically set upon selection of scope (e.g. stack frame) @@ -345,25 +490,33 @@ struct type *language_bool_type (const struct language_defn *l, struct type *language_string_char_type (const struct language_defn *l, struct gdbarch *gdbarch); -struct type *language_lookup_primitive_type_by_name (const struct language_defn *l, - struct gdbarch *gdbarch, - const char *name); +/* Look up type NAME in language L, and return its definition for architecture + GDBARCH. Returns NULL if not found. */ + +struct type *language_lookup_primitive_type (const struct language_defn *l, + struct gdbarch *gdbarch, + const char *name); + +/* Wrapper around language_lookup_primitive_type to return the + corresponding symbol. */ + +struct symbol * + language_lookup_primitive_type_as_symbol (const struct language_defn *l, + struct gdbarch *gdbarch, + const char *name); /* These macros define the behaviour of the expression evaluator. */ -/* Should we strictly type check expressions? */ -#define STRICT_TYPE (type_check != type_check_off) - -/* Should we range check values against the domain of their type? */ +/* Should we range check values against the domain of their type? */ #define RANGE_CHECK (range_check != range_check_off) -/* "cast" really means conversion */ -/* FIXME -- should be a setting in language_defn */ -#define CAST_IS_CONVERSION (current_language->la_language == language_c || \ - current_language->la_language == language_cplus || \ - current_language->la_language == language_objc) +/* "cast" really means conversion. */ +/* FIXME -- should be a setting in language_defn. */ +#define CAST_IS_CONVERSION(LANG) ((LANG)->la_language == language_c || \ + (LANG)->la_language == language_cplus || \ + (LANG)->la_language == language_objc) extern void language_info (int); @@ -373,38 +526,36 @@ extern enum language set_language (enum language); /* This page contains functions that return things that are specific to languages. Each of these functions is based on the current setting of working_lang, which the user sets - with the "set language" command. */ + with the "set language" command. */ -#define LA_PRINT_TYPE(type,varstring,stream,show,level) \ - (current_language->la_print_type(type,varstring,stream,show,level)) +#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_VAL_PRINT(type,valaddr,offset,addr,stream,recurse,options) \ - (current_language->la_val_print(type,valaddr,offset,addr,stream, \ - recurse,options)) #define LA_VALUE_PRINT(val,stream,options) \ (current_language->la_value_print(val,stream,options)) #define LA_PRINT_CHAR(ch, type, stream) \ (current_language->la_printchar(ch, type, stream)) -#define LA_PRINT_STRING(stream, elttype, string, length, encoding, force_ellipses,options) \ +#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_GET_STRING(value, buffer, length, chartype, encoding) \ - (current_language->la_get_string(value, buffer, length, chartype, encoding)) -#define LA_PRINT_ARRAY_INDEX(index_value, stream, optins) \ +#define LA_PRINT_ARRAY_INDEX(index_value, stream, options) \ (current_language->la_print_array_index(index_value, stream, options)) +#define LA_ITERATE_OVER_SYMBOLS(BLOCK, NAME, DOMAIN, CALLBACK) \ + (current_language->la_iterate_over_symbols (BLOCK, NAME, DOMAIN, CALLBACK)) + /* Test a character to decide whether it can be printed in literal form or needs to be printed in another representation. For example, in C the literal form of the character with octal value 141 is 'a' and the "other representation" is '\141'. The "other representation" - is program language dependent. */ + is program language dependent. */ #define PRINT_LITERAL_FORM(c) \ ((c) >= 0x20 \ @@ -413,37 +564,15 @@ extern enum language set_language (enum language); /* Type predicates */ -extern int simple_type (struct type *); - -extern int ordered_type (struct type *); - -extern int same_type (struct type *, struct type *); - -extern int integral_type (struct type *); - -extern int numeric_type (struct type *); - -extern int character_type (struct type *); - -extern int boolean_type (struct type *); - -extern int float_type (struct type *); - extern int pointer_type (struct type *); -extern int structured_type (struct type *); - -/* Checks Binary and Unary operations for semantic type correctness */ -/* FIXME: Does not appear to be used */ -#define unop_type_check(v,o) binop_type_check((v),NULL,(o)) - -extern void binop_type_check (struct value *, struct value *, int); +/* 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 type_error (const char *, ...) ATTR_FORMAT (printf, 1, 2); - -extern void range_error (const char *, ...) ATTR_FORMAT (printf, 1, 2); +extern void range_error (const char *, ...) ATTRIBUTE_PRINTF (1, 2); /* Data: Does this value represent "truth" to the current language? */ @@ -451,19 +580,13 @@ extern int value_true (struct value *); /* Misc: The string representing a particular enum language. */ -extern enum language language_enum (char *str); +extern enum language language_enum (const char *str); extern const struct language_defn *language_def (enum language); -extern char *language_str (enum language); - -/* Add a language to the set known by GDB (at initialization time). */ +extern const char *language_str (enum language); -extern void add_language (const struct language_defn *); - -extern enum language get_frame_language (void); /* In stack.c */ - -/* Check for a language-specific trampoline. */ +/* Check for a language-specific trampoline. */ extern CORE_ADDR skip_language_trampoline (struct frame_info *, CORE_ADDR pc); @@ -471,12 +594,19 @@ extern CORE_ADDR skip_language_trampoline (struct frame_info *, CORE_ADDR pc); 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 char *default_word_break_characters (void); +extern const char *default_word_break_characters (void); /* Print the index of an array element using the C99 syntax. */ extern void default_print_array_index (struct value *index_value, @@ -496,10 +626,117 @@ int default_pass_by_reference (struct type *type); void default_print_typedef (struct type *type, struct symbol *new_symbol, struct ui_file *stream); -void default_get_string (struct value *value, gdb_byte **buffer, int *length, - struct type **char_type, const char **charset); +/* 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 + LOOKUP_NAME. Specifically, if the current language is Ada, this + may return an Ada matcher regardless of LANG. */ +symbol_name_matcher_ftype *get_symbol_name_matcher + (const language_defn *lang, const lookup_name_info &lookup_name); + +/* The languages supported by GDB. */ + +extern const struct language_defn auto_language_defn; +extern const struct language_defn unknown_language_defn; +extern const struct language_defn minimal_language_defn; + +extern const struct language_defn ada_language_defn; +extern const struct language_defn asm_language_defn; +extern const struct language_defn c_language_defn; +extern const struct language_defn cplus_language_defn; +extern const struct language_defn d_language_defn; +extern const struct language_defn f_language_defn; +extern const struct language_defn go_language_defn; +extern const struct language_defn m2_language_defn; +extern const struct language_defn objc_language_defn; +extern const struct language_defn opencl_language_defn; +extern const struct language_defn pascal_language_defn; +extern const struct language_defn rust_language_defn; + +/* Save the current language and restore it upon destruction. */ + +class scoped_restore_current_language +{ +public: + + explicit scoped_restore_current_language () + : m_lang (current_language->la_language) + { + } + + ~scoped_restore_current_language () + { + set_language (m_lang); + } + + scoped_restore_current_language (const scoped_restore_current_language &) + = delete; + scoped_restore_current_language &operator= + (const scoped_restore_current_language &) = delete; + +private: + + enum language m_lang; +}; + +/* If language_mode is language_mode_auto, + then switch current language to the language of SYM + and restore current language upon destruction. -void c_get_string (struct value *value, gdb_byte **buffer, int *length, - struct type **char_type, const char **charset); + Else do nothing. */ + +class scoped_switch_to_sym_language_if_auto +{ +public: + + explicit scoped_switch_to_sym_language_if_auto (const struct symbol *sym) + { + if (language_mode == language_mode_auto) + { + m_lang = current_language->la_language; + m_switched = true; + set_language (sym->language ()); + } + else + { + m_switched = false; + /* Assign to m_lang to silence a GCC warning. See + https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80635. */ + m_lang = language_unknown; + } + } + + ~scoped_switch_to_sym_language_if_auto () + { + if (m_switched) + set_language (m_lang); + } + + DISABLE_COPY_AND_ASSIGN (scoped_switch_to_sym_language_if_auto); + +private: + bool m_switched; + enum language m_lang; +}; #endif /* defined (LANGUAGE_H) */