/* Definitions for dealing with stack frames, for GDB, the GNU debugger.
- Copyright (C) 1986-2020 Free Software Foundation, Inc.
+ Copyright (C) 1986-2021 Free Software Foundation, Inc.
This file is part of GDB.
/* The frame's special address. This shall be constant through out the
lifetime of the frame. This is used for architectures that may have
- frames that do not change the stack but are still distinct and have
- some form of distinct identifier (e.g. the ia64 which uses a 2nd
+ frames that do not change the stack but are still distinct and have
+ some form of distinct identifier (e.g. the ia64 which uses a 2nd
stack for registers). This field is treated as unordered - i.e. will
not be used in frame ordering comparisons.
Caller of inlined function will have it zero, each more inner called frame
will have it increasingly one, two etc. Similarly for TAILCALL_FRAME. */
int artificial_depth;
+
+ /* Return a string representation of this frame id. */
+ std::string to_string () const;
};
/* Save and restore the currently selected frame. */
private:
- /* The ID of the previously selected frame. */
+ /* The ID and level of the previously selected frame. */
struct frame_id m_fid;
+ int m_level;
+
+ /* Save/restore the language as well, because selecting a frame
+ changes the current language to the frame's language if "set
+ language auto". */
+ enum language m_lang;
};
/* Methods for constructing and comparing Frame IDs. */
/* Returns true when L and R identify the same frame. */
extern bool frame_id_eq (frame_id l, frame_id r);
-/* Write the internal representation of a frame ID on the specified
- stream. */
-extern void fprint_frame_id (struct ui_file *file, struct frame_id id);
-
-
/* Frame types. Some are real, some are signal trampolines, and some
are completely artificial (dummy). */
modifies the target invalidating the frame cache). */
extern void reinit_frame_cache (void);
-/* On demand, create the selected frame and then return it. If the
- selected frame can not be created, this function prints then throws
- an error. When MESSAGE is non-NULL, use it for the error message,
+/* Return the selected frame. Always returns non-NULL. If there
+ isn't an inferior sufficient for creating a frame, an error is
+ thrown. When MESSAGE is non-NULL, use it for the error message,
otherwise use a generic error message. */
/* FIXME: cagney/2002-11-28: At present, when there is no selected
frame, this function always returns the current (inner most) frame.
It should instead, when a thread has previously had its frame
selected (but not resumed) and the frame cache invalidated, find
and then return that thread's previously selected frame. */
-extern struct frame_info *get_selected_frame (const char *message);
+extern struct frame_info *get_selected_frame (const char *message = nullptr);
-/* If there is a selected frame, return it. Otherwise, return NULL. */
-extern struct frame_info *get_selected_frame_if_set (void);
-
-/* Select a specific frame. NULL, apparently implies re-select the
- inner most frame. */
+/* Select a specific frame. NULL implies re-select the inner most
+ frame. */
extern void select_frame (struct frame_info *);
+/* Save the frame ID and frame level of the selected frame in FRAME_ID
+ and FRAME_LEVEL, to be restored later with restore_selected_frame.
+
+ This is preferred over getting the same info out of
+ get_selected_frame directly because this function does not create
+ the selected-frame's frame_info object if it hasn't been created
+ yet, and thus is more efficient and doesn't throw. */
+extern void save_selected_frame (frame_id *frame_id, int *frame_level)
+ noexcept;
+
+/* Restore selected frame as saved with save_selected_frame.
+
+ Does not try to find the corresponding frame_info object. Instead
+ the next call to get_selected_frame will look it up and cache the
+ result.
+
+ This function does not throw. It is designed to be safe to called
+ from the destructors of RAII types. */
+extern void restore_selected_frame (frame_id frame_id, int frame_level)
+ noexcept;
+
+/* Lookup the frame_info object for the selected frame FRAME_ID /
+ FRAME_LEVEL and cache the result.
+
+ If FRAME_LEVEL > 0 and the originally selected frame isn't found,
+ warn and select the innermost (current) frame. */
+extern void lookup_selected_frame (frame_id frame_id, int frame_level);
+
/* Given a FRAME, return the next (more inner, younger) or previous
(more outer, older) frame. */
extern struct frame_info *get_prev_frame (struct frame_info *);
contents are optimized out or unavailable, set *OPTIMIZEDP,
*UNAVAILABLEP accordingly. */
extern bool get_frame_register_bytes (frame_info *frame, int regnum,
- CORE_ADDR offset, int len,
- gdb_byte *myaddr,
+ CORE_ADDR offset,
+ gdb::array_view<gdb_byte> buffer,
int *optimizedp, int *unavailablep);
-/* Write LEN bytes to one or multiple registers starting with REGNUM
- in frame FRAME, starting at OFFSET, into BUF. */
+/* Write bytes from BUFFER to one or multiple registers starting with REGNUM
+ in frame FRAME, starting at OFFSET. */
extern void put_frame_register_bytes (struct frame_info *frame, int regnum,
- CORE_ADDR offset, int len,
- const gdb_byte *myaddr);
+ CORE_ADDR offset,
+ gdb::array_view<const gdb_byte> buffer);
/* Unwind the PC. Strictly speaking return the resume address of the
calling frame. For GDB, `pc' is the resume address and not a
adaptor frames this should be ok. */
extern void get_frame_memory (struct frame_info *this_frame, CORE_ADDR addr,
- gdb_byte *buf, int len);
+ gdb::array_view<gdb_byte> buffer);
extern LONGEST get_frame_memory_signed (struct frame_info *this_frame,
CORE_ADDR memaddr, int len);
extern ULONGEST get_frame_memory_unsigned (struct frame_info *this_frame,
/* Same as above, but return true zero when the entire memory read
succeeds, false otherwise. */
extern bool safe_frame_unwind_memory (frame_info *this_frame, CORE_ADDR addr,
- gdb_byte *buf, int len);
+ gdb::array_view<gdb_byte> buffer);
/* Return this frame's architecture. */
extern struct gdbarch *get_frame_arch (struct frame_info *this_frame);
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