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7831bc9185
I believe that the get_exec_file function is unnecessary, and the code
can be simplified if we remove it.
Consider for instance when you "run" a program on Linux with native
debugging.
1. run_command_1 obtains the executable file from
`current_program_space->exec_filename ()`
2. it passes it to `run_target->create_inferior()`, which is
`inf_ptrace_target::create_inferior()` in this case, which then
passes it to `fork_inferior()`
3. `fork_inferior()` then has a fallback, where if the passed exec file
is nullptr, it gets its from `get_exec_file()`.
4. `get_exec_file()` returns `current_program_space->exec_filename ()`
- just like the things we started with - or errors out if the
current program space doesn't have a specified executable.
If there's no exec filename passed in step 1, there's not going to be
any in step 4, so it seems pointless to call `get_exec_file()`, we could
just error out when `exec_file` is nullptr. But we can't error out
directly in `fork_inferior()`, since the error is GDB-specific, and that
function is shared with GDBserver.
Speaking of GDBserver, all code paths that lead to `fork_inferior()`
provide a non-nullptr exec file.
Therefore, to simplify things:
- Make `fork_inferior()` assume that the passed exec file is not
nullptr, don't call `get_exec_file()`
- Change some targets (darwin-nat, go32-nat, gnu-nat, inf-ptrace,
nto-procfs, procfs) to error out when the exec file passed to their
create_inferior method is nullptr. Some targets are fine with a
nullptr exec file, so we can't check that in `run_command_1()`.
- Add the `no_executable_specified_error()` function, which re-uses the
error message that `get_exec_file()` had.
- Change some targets (go32-nat, nto-procfs) to not call
`get_exec_file()`, since it's pointless for the same reason as in the
example above, if it returns, it's going the be the same value as the
`exec_file` parameter. Just rely on `exec_file`.
- Remove the final use of `get_exec_file()`, in `load_command()`.
- Remove the `get_exec_file()` implementations in GDB and GDBserver and
remove the shared declaration.
Change-Id: I601c16498e455f7baa1f111a179da2f6c913baa3
Approved-By: Tom Tromey <tom@tromey.com>
114 lines
4.0 KiB
C++
114 lines
4.0 KiB
C++
/* Work with executable files, for GDB, the GNU debugger.
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Copyright (C) 2003-2024 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef EXEC_H
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#define EXEC_H
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#include "target.h"
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#include "progspace.h"
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#include "memrange.h"
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#include "symfile-add-flags.h"
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struct target_section;
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struct target_ops;
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struct bfd;
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struct objfile;
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/* Builds a section table, given args BFD. */
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extern std::vector<target_section> build_section_table (struct bfd *);
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/* VFORK_CHILD is a child vforked and its program space is shared with its
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parent. This pushes the exec target on that inferior's target stack if
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there are sections in the program space's section table. */
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extern void exec_on_vfork (inferior *vfork_child);
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/* Read from mappable read-only sections of BFD executable files.
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Return TARGET_XFER_OK, if read is successful. Return
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TARGET_XFER_EOF if read is done. Return TARGET_XFER_E_IO
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otherwise. */
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extern enum target_xfer_status
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exec_read_partial_read_only (gdb_byte *readbuf, ULONGEST offset,
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ULONGEST len, ULONGEST *xfered_len);
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/* Read or write from mappable sections of BFD executable files.
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Request to transfer up to LEN 8-bit bytes of the target sections
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defined by SECTIONS and SECTIONS_END. The OFFSET specifies the
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starting address.
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The MATCH_CB predicate is optional; when provided it will be called
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for each section under consideration. When MATCH_CB evaluates as
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true, the section remains under consideration; a false result
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removes it from consideration for performing the memory transfers
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noted above. See memory_xfer_partial_1() in target.c for an
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example.
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Return the number of bytes actually transfered, or zero when no
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data is available for the requested range.
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This function is intended to be used from target_xfer_partial
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implementations. See target_read and target_write for more
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information.
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One, and only one, of readbuf or writebuf must be non-NULL. */
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extern enum target_xfer_status
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section_table_xfer_memory_partial (gdb_byte *,
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const gdb_byte *,
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ULONGEST, ULONGEST, ULONGEST *,
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const std::vector<target_section> &,
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gdb::function_view<bool
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(const struct target_section *)> match_cb
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= nullptr);
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/* Read from mappable read-only sections of BFD executable files.
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Similar to exec_read_partial_read_only, but return
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TARGET_XFER_UNAVAILABLE if data is unavailable. */
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extern enum target_xfer_status
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section_table_read_available_memory (gdb_byte *readbuf, ULONGEST offset,
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ULONGEST len, ULONGEST *xfered_len);
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/* Set the loaded address of a section. */
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extern void exec_set_section_address (const char *, int, CORE_ADDR);
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/* Prints info about all sections defined in the TABLE. ABFD is
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special cased --- it's filename is omitted; if it is the executable
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file, its entry point is printed. */
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extern void print_section_info (const std::vector<target_section> *table,
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bfd *abfd);
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/* Helper function that attempts to open the symbol file at EXEC_FILE_HOST.
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If successful, it proceeds to add the symbol file as the main symbol file.
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ADD_FLAGS is passed on to the function adding the symbol file. */
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extern void try_open_exec_file (const char *exec_file_host,
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struct inferior *inf,
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symfile_add_flags add_flags);
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/* Report a "No executable file specified" error. */
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extern void no_executable_specified_error ();
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#endif
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