/* Source-language-related definitions for GDB.
- Copyright (C) 1991-2018 Free Software Foundation, Inc.
+ Copyright (C) 1991-2020 Free Software Foundation, Inc.
Contributed by the Department of Computer Science at the State University
of New York at Buffalo.
#define LANGUAGE_H 1
#include "symtab.h"
-#include "common/function-view.h"
+#include "gdbsupport/function-view.h"
#include "expression.h"
/* Forward decls for prototypes. */
struct type_print_options;
struct lang_varobj_ops;
struct parser_state;
-struct compile_instance;
+class compile_instance;
struct completion_match_for_lcd;
+class innermost_block_tracker;
#define MAX_FORTRAN_DIMS 7 /* Maximum number of F77 array dims. */
struct type *bool_type_default;
};
+/* In a language (particularly C++) a function argument of an aggregate
+ type (i.e. class/struct/union) may be implicitly passed by reference
+ even though it is declared a call-by-value argument in the source.
+ The struct below puts together necessary information for GDB to be
+ able to detect and carry out pass-by-reference semantics for a
+ particular type. This type is referred as T in the inlined comments
+ below.
+
+ The default values of the fields are chosen to give correct semantics
+ for primitive types and for simple aggregate types, such as
+
+ class T {
+ int x;
+ }; */
+
+struct language_pass_by_ref_info
+{
+ /* True if an argument of type T can be passed to a function by value
+ (i.e. not through an implicit reference). False, otherwise. */
+ bool trivially_copyable = true;
+
+ /* True if a copy of a value of type T can be initialized by
+ memcpy'ing the value bit-by-bit. False, otherwise.
+ E.g. If T has a user-defined copy ctor, this should be false. */
+ bool trivially_copy_constructible = true;
+
+ /* True if a value of type T can be destructed simply by reclaiming
+ the memory area occupied by the value. False, otherwise.
+ E.g. If T has a user-defined destructor, this should be false. */
+ bool trivially_destructible = true;
+
+ /* True if it is allowed to create a copy of a value of type T.
+ False, otherwise.
+ E.g. If T has a deleted copy ctor, this should be false. */
+ bool copy_constructible = true;
+
+ /* True if a value of type T can be destructed. False, otherwise.
+ E.g. If T has a deleted destructor, this should be false. */
+ bool destructible = true;
+};
+
/* Structure tying together assorted information about a language. */
struct language_defn
int (*la_parser) (struct parser_state *);
- /* Parser error function. */
-
- void (*la_error) (const char *);
-
/* 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) (expression_up *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);
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 ui_file *stream,
const struct value_print_options *options);
- /* Return non-zero if TYPE should be passed (and returned) by
- 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);
+ /* Return information about whether TYPE should be passed
+ (and returned) by reference at the language level. */
+ struct language_pass_by_ref_info (*la_pass_by_reference)
+ (struct type *type);
/* Return an expression that can be used for a location
watchpoint. TYPE is a pointer type that points to the memory
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. */
- void (*la_iterate_over_symbols)
+ bool (*la_iterate_over_symbols)
(const struct block *block, const lookup_name_info &name,
domain_enum domain,
gdb::function_view<symbol_found_callback_ftype> callback);
instance is owned by its caller and must be deallocated by
calling its 'destroy' method. */
- struct compile_instance *(*la_get_compile_instance) (void);
+ 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
parsed.
EXPR_PC is the PC at which the expression is being parsed. */
- std::string (*la_compute_program) (struct compile_instance *inst,
+ std::string (*la_compute_program) (compile_instance *inst,
const char *input,
struct gdbarch *gdbarch,
const struct block *expr_block,
CORE_ADDR expr_pc);
- /* Add fields above this point, so the magic number is always last. */
- /* Magic number for compat checking. */
+ /* Return true if TYPE is a string type. */
+ bool (*la_is_string_type_p) (struct type *type);
- long la_magic;
+ /* 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.
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)
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, options) \
(current_language->la_print_array_index(index_value, stream, options))
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);
struct ui_file *stream,
const struct value_print_options *options);
-/* Return non-zero if TYPE should be passed (and returned) by
- reference at the language level. */
-int language_pass_by_reference (struct type *type);
+/* 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);
-/* Return zero; by default, types are passed by value at the language
- level. The target ABI may pass or return some structs by reference
- independent of this. */
-int default_pass_by_reference (struct type *type);
+/* Return a default struct that provides pass-by-reference information
+ about the given TYPE. Languages should update the default values
+ as appropriate. */
+struct language_pass_by_ref_info default_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);
-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
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_byte **buffer, int *length,
- struct type **char_type, const char **charset);
+void c_get_string (struct value *value,
+ gdb::unique_xmalloc_ptr<gdb_byte> *buffer,
+ int *length, struct type **char_type,
+ const char **charset);
/* The default implementation of la_symbol_name_matcher. Matches with
strncmp_iw. */
completion_match_result *comp_match_res);
/* Get LANG's symbol_name_matcher method for LOOKUP_NAME. Returns
- default_symbol_name_matcher if not set. */
-symbol_name_matcher_ftype *language_get_symbol_name_matcher
+ 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. */
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.
+
+ 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) */
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