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/* JIT declarations for GDB, the GNU Debugger.
Copyright (C) 2009-2020 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef JIT_H
#define JIT_H
struct objfile;
struct minimal_symbol;
/* When the JIT breakpoint fires, the inferior wants us to take one of
these actions. These values are used by the inferior, so the
values of these enums cannot be changed. */
typedef enum
{
JIT_NOACTION = 0,
JIT_REGISTER,
JIT_UNREGISTER
} jit_actions_t;
/* This struct describes a single symbol file in a linked list of
symbol files describing generated code. As the inferior generates
code, it adds these entries to the list, and when we attach to the
inferior, we read them all. For the first element prev_entry
should be NULL, and for the last element next_entry should be
NULL. */
struct jit_code_entry
{
CORE_ADDR next_entry;
CORE_ADDR prev_entry;
CORE_ADDR symfile_addr;
ULONGEST symfile_size;
};
/* This is the global descriptor that the inferior uses to communicate
information to the debugger. To alert the debugger to take an
action, the inferior sets the action_flag to the appropriate enum
value, updates relevant_entry to point to the relevant code entry,
and calls the function at the well-known symbol with our
breakpoint. We then read this descriptor from another global
well-known symbol. */
struct jit_descriptor
{
uint32_t version;
/* This should be jit_actions_t, but we want to be specific about the
bit-width. */
uint32_t action_flag;
CORE_ADDR relevant_entry;
CORE_ADDR first_entry;
};
/* An objfile that defines the required symbols of the JIT interface has an
instance of this type attached to it. */
struct jiter_objfile_data
{
jiter_objfile_data (struct objfile *objfile)
: objfile (objfile)
{}
~jiter_objfile_data ();
/* Back-link to the objfile. */
struct objfile *objfile;
/* Symbol for __jit_debug_register_code. */
minimal_symbol *register_code = nullptr;
/* Symbol for __jit_debug_descriptor. */
minimal_symbol *descriptor = nullptr;
/* This is the relocated address of the __jit_debug_register_code function
provided by this objfile. This is used to detect relocations changes
requiring the breakpoint to be re-created. */
CORE_ADDR cached_code_address = 0;
/* This is the JIT event breakpoint, or nullptr if it has been deleted. */
breakpoint *jit_breakpoint = nullptr;
};
/* An objfile that is the product of JIT compilation and was registered
using the JIT interface has an instance of this type attached to it. */
struct jited_objfile_data
{
jited_objfile_data (CORE_ADDR addr)
: addr (addr)
{}
/* Address of struct jit_code_entry for this objfile. */
CORE_ADDR addr;
};
/* Looks for the descriptor and registration symbols and breakpoints
the registration function. If it finds both, it registers all the
already JITed code. If it has already found the symbols, then it
doesn't try again. */
extern void jit_inferior_created_hook (void);
/* Re-establish the jit breakpoint(s). */
extern void jit_breakpoint_re_set (void);
/* This function is called by handle_inferior_event when it decides
that the JIT event breakpoint has fired. JITER is the objfile
whose JIT event breakpoint has been hit. */
extern void jit_event_handler (gdbarch *gdbarch, objfile *jiter);
#endif /* JIT_H */
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