/* Interface between gdb and its extension languages.
- Copyright (C) 2014-2017 Free Software Foundation, Inc.
+ Copyright (C) 2014-2020 Free Software Foundation, Inc.
This file is part of GDB.
#define EXTENSION_H
#include "mi/mi-cmds.h" /* For PRINT_NO_VALUES, etc. */
-#include "common/vec.h"
+#include "gdbsupport/array-view.h"
+#include "gdbsupport/gdb_optional.h"
struct breakpoint;
struct command_line;
succeeded. */
EXT_LANG_BT_OK = 1,
- /* Return when the frame filter process is complete, and all
- operations have succeeded. */
- EXT_LANG_BT_COMPLETED = 2,
-
/* Return when the frame filter process is complete, but there
were no filter registered and enabled to process. */
- EXT_LANG_BT_NO_FILTERS = 3
+ EXT_LANG_BT_NO_FILTERS = 2
};
/* Flags to pass to apply_extlang_frame_filter. */
-enum frame_filter_flags
+enum frame_filter_flag
{
/* Set this flag if frame level is to be printed. */
- PRINT_LEVEL = 1,
+ PRINT_LEVEL = 1 << 0,
/* Set this flag if frame information is to be printed. */
- PRINT_FRAME_INFO = 2,
+ PRINT_FRAME_INFO = 1 << 1,
/* Set this flag if frame arguments are to be printed. */
- PRINT_ARGS = 4,
+ PRINT_ARGS = 1 << 2,
/* Set this flag if frame locals are to be printed. */
- PRINT_LOCALS = 8,
+ PRINT_LOCALS = 1 << 3,
+
+ /* Set this flag if a "More frames" message is to be printed. */
+ PRINT_MORE_FRAMES = 1 << 4,
+
+ /* Set this flag if elided frames should not be printed. */
+ PRINT_HIDE = 1 << 5,
};
+DEF_ENUM_FLAGS_TYPE (enum frame_filter_flag, frame_filter_flags);
+
/* A choice of the different frame argument printing strategies that
can occur in different cases of frame filter instantiation. */
CLI_SCALAR_VALUES,
/* Print all values for arguments when invoked from the CLI. */
- CLI_ALL_VALUES
+ CLI_ALL_VALUES,
+
+ /* Only indicate the presence of arguments when invoked from the CLI. */
+ CLI_PRESENCE
};
/* The possible results of
struct ext_lang_type_printers
{
+ ext_lang_type_printers ();
+ ~ext_lang_type_printers ();
+
+ DISABLE_COPY_AND_ASSIGN (ext_lang_type_printers);
+
/* Type-printers from Python. */
- void *py_type_printers;
+ void *py_type_printers = nullptr;
+};
+
+/* The return code for some API calls. */
+
+enum ext_lang_rc
+{
+ /* The operation completed successfully. */
+ EXT_LANG_RC_OK,
+
+ /* The operation was not performed (e.g., no pretty-printer). */
+ EXT_LANG_RC_NOP,
+
+ /* There was an error (e.g., Python error while printing a value).
+ When an error occurs no further extension languages are tried.
+ This is to preserve existing behaviour, and because it's convenient
+ for Python developers.
+ Note: This is different than encountering a memory error trying to read
+ a value for pretty-printing. Here we're referring to, e.g., programming
+ errors that trigger an exception in the extension language. */
+ EXT_LANG_RC_ERROR
};
/* A type which holds its extension language specific xmethod worker data. */
struct xmethod_worker
{
- /* The language the xmethod worker is implemented in. */
- const struct extension_language_defn *extlang;
+ xmethod_worker (const extension_language_defn *extlang)
+ : m_extlang (extlang)
+ {}
+
+ virtual ~xmethod_worker () = default;
+
+ /* Invoke the xmethod encapsulated in this worker and return the result.
+ The method is invoked on OBJ with arguments in the ARGS array. */
+
+ virtual value *invoke (value *obj, gdb::array_view<value *> args) = 0;
+
+ /* Return the arg types of the xmethod encapsulated in this worker.
+ The type of the 'this' object is returned as the first element of
+ the vector. */
- /* The extension language specific data for this xmethod worker. */
- void *data;
+ std::vector<type *> get_arg_types ();
- /* The TYPE_CODE_XMETHOD value corresponding to this worker.
- Always use value_of_xmethod to access it. */
- struct value *value;
+ /* Return the type of the result of the xmethod encapsulated in this worker.
+ OBJECT and ARGS are the same as for invoke. */
+
+ type *get_result_type (value *object, gdb::array_view<value *> args);
+
+private:
+
+ /* Return the types of the arguments the method takes. The types
+ are returned in TYPE_ARGS, one per argument. */
+
+ virtual enum ext_lang_rc do_get_arg_types
+ (std::vector<type *> *type_args) = 0;
+
+ /* Fetch the type of the result of the method implemented by this
+ worker. OBJECT and ARGS are the same as for the invoked method.
+ The result type is stored in *RESULT_TYPE. */
+
+ virtual enum ext_lang_rc do_get_result_type
+ (struct value *obj, gdb::array_view<value *> args,
+ struct type **result_type_ptr) = 0;
+
+ /* The language the xmethod worker is implemented in. */
+
+ const extension_language_defn *m_extlang;
};
-typedef struct xmethod_worker *xmethod_worker_ptr;
-DEF_VEC_P (xmethod_worker_ptr);
-typedef VEC (xmethod_worker_ptr) xmethod_worker_vec;
+typedef std::unique_ptr<xmethod_worker> xmethod_worker_up;
-\f
/* The interface for gdb's own extension(/scripting) language. */
extern const struct extension_language_defn extension_language_gdb;
extern void auto_load_ext_lang_scripts_for_objfile (struct objfile *);
-extern struct ext_lang_type_printers *start_ext_lang_type_printers (void);
-
extern char *apply_ext_lang_type_printers (struct ext_lang_type_printers *,
struct type *);
-extern void free_ext_lang_type_printers (struct ext_lang_type_printers *);
-
extern int apply_ext_lang_val_pretty_printer
- (struct type *type,
- LONGEST embedded_offset, CORE_ADDR address,
- struct ui_file *stream, int recurse,
- struct value *val, const struct value_print_options *options,
+ (struct value *value, struct ui_file *stream, int recurse,
+ const struct value_print_options *options,
const struct language_defn *language);
extern enum ext_lang_bt_status apply_ext_lang_frame_filter
- (struct frame_info *frame, int flags, enum ext_lang_frame_args args_type,
+ (struct frame_info *frame, frame_filter_flags flags,
+ enum ext_lang_frame_args args_type,
struct ui_out *out, int frame_low, int frame_high);
extern void preserve_ext_lang_values (struct objfile *, htab_t copied_types);
extern int breakpoint_ext_lang_cond_says_stop (struct breakpoint *);
-extern struct value *invoke_xmethod (struct xmethod_worker *,
- struct value *,
- struct value **, int nargs);
-
-extern struct xmethod_worker *clone_xmethod_worker (struct xmethod_worker *);
-
-extern struct xmethod_worker *new_xmethod_worker
- (const struct extension_language_defn *extlang, void *data);
-
-extern void free_xmethod_worker (struct xmethod_worker *);
-
-extern void free_xmethod_worker_vec (void *vec);
+/* If a method with name METHOD_NAME is to be invoked on an object of type
+ TYPE, then all extension languages are searched for implementations of
+ methods with name METHOD_NAME. All matches found are appended to the WORKERS
+ vector. */
-extern xmethod_worker_vec *get_matching_xmethod_workers
- (struct type *, const char *);
+extern void get_matching_xmethod_workers
+ (struct type *type, const char *method_name,
+ std::vector<xmethod_worker_up> *workers);
-extern struct type **get_xmethod_arg_types (struct xmethod_worker *, int *);
+/* Try to colorize some source code. FILENAME is the name of the file
+ holding the code. CONTENTS is the source code itself. This will
+ either a colorized (using ANSI terminal escapes) version of the
+ source code, or an empty value if colorizing could not be done. */
-extern struct type *get_xmethod_result_type (struct xmethod_worker *,
- struct value *object,
- struct value **args, int nargs);
+extern gdb::optional<std::string> ext_lang_colorize
+ (const std::string &filename, const std::string &contents);
#endif /* EXTENSION_H */
projects / deliverable / binutils-gdb.git / blobdiff