432b5c4022
This renames a few members of tui_source_window_base, and makes them "protected". 2020-02-22 Tom Tromey <tom@tromey.com> * tui/tui-layout.c (extract_display_start_addr): Rewrite. * tui/tui-disasm.h (struct tui_disasm_window) <display_start_addr>: Declare. * tui/tui-source.h (struct tui_source_window) <display_start_addr>: Declare. * tui/tui-winsource.h (struct tui_source_window_base) <show_source_line, display_start_addr>: New methods. <m_horizontal_offset, m_start_line_or_addr, m_gdbarch, m_content>: Rename and move to protected section. * tui/tui-winsource.c (tui_source_window_base::update_source_window) (tui_source_window_base::do_erase_source_content): Update. (tui_source_window_base::show_source_line): Now a method. (tui_source_window_base::show_source_content) (tui_source_window_base::tui_source_window_base) (tui_source_window_base::rerender) (tui_source_window_base::refill) (tui_source_window_base::do_scroll_horizontal) (tui_source_window_base::set_is_exec_point_at) (tui_source_window_base::update_breakpoint_info) (tui_source_window_base::update_exec_info): Update. * tui/tui-source.c (tui_source_window::set_contents) (tui_source_window::showing_source_p) (tui_source_window::do_scroll_vertical) (tui_source_window::location_matches_p) (tui_source_window::line_is_displayed): Update. (tui_source_window::display_start_addr): New method. * tui/tui-disasm.c (tui_disasm_window::set_contents) (tui_disasm_window::do_scroll_vertical) (tui_disasm_window::location_matches_p): Update. (tui_disasm_window::display_start_addr): New method. Change-Id: I74d72b9da5f458664427db643a108634690c6e19
526 lines
15 KiB
C
526 lines
15 KiB
C
/* Disassembly display.
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Copyright (C) 1998-2020 Free Software Foundation, Inc.
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Contributed by Hewlett-Packard Company.
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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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#include "defs.h"
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#include "arch-utils.h"
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#include "symtab.h"
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#include "breakpoint.h"
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#include "frame.h"
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#include "value.h"
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#include "source.h"
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#include "disasm.h"
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#include "tui/tui.h"
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#include "tui/tui-command.h"
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#include "tui/tui-data.h"
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#include "tui/tui-win.h"
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#include "tui/tui-layout.h"
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#include "tui/tui-winsource.h"
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#include "tui/tui-stack.h"
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#include "tui/tui-file.h"
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#include "tui/tui-disasm.h"
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#include "tui/tui-source.h"
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#include "progspace.h"
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#include "objfiles.h"
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#include "cli/cli-style.h"
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#include "gdb_curses.h"
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struct tui_asm_line
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{
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CORE_ADDR addr;
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std::string addr_string;
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size_t addr_size;
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std::string insn;
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};
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/* Helper function to find the number of characters in STR, skipping
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any ANSI escape sequences. */
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static size_t
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len_without_escapes (const std::string &str)
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{
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size_t len = 0;
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const char *ptr = str.c_str ();
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char c;
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while ((c = *ptr++) != '\0')
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{
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if (c == '\033')
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{
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ui_file_style style;
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size_t n_read;
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if (style.parse (ptr, &n_read))
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ptr += n_read;
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else
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{
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/* Shouldn't happen, but just skip the ESC if it somehow
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does. */
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++ptr;
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}
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}
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else
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++len;
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}
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return len;
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}
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/* Function to disassemble up to COUNT instructions starting from address
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PC into the ASM_LINES vector (which will be emptied of any previous
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contents). Return the address of the COUNT'th instruction after pc.
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When ADDR_SIZE is non-null then place the maximum size of an address and
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label into the value pointed to by ADDR_SIZE, and set the addr_size
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field on each item in ASM_LINES, otherwise the addr_size fields within
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ASM_LINES are undefined.
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It is worth noting that ASM_LINES might not have COUNT entries when this
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function returns. If the disassembly is truncated for some other
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reason, for example, we hit invalid memory, then ASM_LINES can have
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fewer entries than requested. */
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static CORE_ADDR
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tui_disassemble (struct gdbarch *gdbarch,
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std::vector<tui_asm_line> &asm_lines,
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CORE_ADDR pc, int count,
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size_t *addr_size = nullptr)
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{
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bool term_out = source_styling && gdb_stdout->can_emit_style_escape ();
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string_file gdb_dis_out (term_out);
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/* Must start with an empty list. */
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asm_lines.clear ();
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/* Now construct each line. */
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for (int i = 0; i < count; ++i)
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{
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tui_asm_line tal;
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CORE_ADDR orig_pc = pc;
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try
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{
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pc = pc + gdb_print_insn (gdbarch, pc, &gdb_dis_out, NULL);
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}
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catch (const gdb_exception_error &except)
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{
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/* If PC points to an invalid address then we'll catch a
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MEMORY_ERROR here, this should stop the disassembly, but
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otherwise is fine. */
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if (except.error != MEMORY_ERROR)
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throw;
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return pc;
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}
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/* Capture the disassembled instruction. */
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tal.insn = std::move (gdb_dis_out.string ());
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gdb_dis_out.clear ();
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/* And capture the address the instruction is at. */
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tal.addr = orig_pc;
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print_address (gdbarch, orig_pc, &gdb_dis_out);
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tal.addr_string = std::move (gdb_dis_out.string ());
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gdb_dis_out.clear ();
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if (addr_size != nullptr)
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{
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size_t new_size;
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if (term_out)
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new_size = len_without_escapes (tal.addr_string);
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else
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new_size = tal.addr_string.size ();
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*addr_size = std::max (*addr_size, new_size);
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tal.addr_size = new_size;
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}
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asm_lines.push_back (std::move (tal));
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}
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return pc;
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}
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/* Look backward from ADDR for an address from which we can start
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disassembling, this needs to be something we can be reasonably
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confident will fall on an instruction boundary. We use msymbol
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addresses, or the start of a section. */
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static CORE_ADDR
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tui_find_backward_disassembly_start_address (CORE_ADDR addr)
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{
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struct bound_minimal_symbol msym, msym_prev;
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msym = lookup_minimal_symbol_by_pc_section (addr - 1, nullptr,
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lookup_msym_prefer::TEXT,
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&msym_prev);
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if (msym.minsym != nullptr)
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return BMSYMBOL_VALUE_ADDRESS (msym);
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else if (msym_prev.minsym != nullptr)
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return BMSYMBOL_VALUE_ADDRESS (msym_prev);
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/* Find the section that ADDR is in, and look for the start of the
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section. */
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struct obj_section *section = find_pc_section (addr);
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if (section != NULL)
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return obj_section_addr (section);
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return addr;
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}
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/* Find the disassembly address that corresponds to FROM lines above
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or below the PC. Variable sized instructions are taken into
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account by the algorithm. */
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static CORE_ADDR
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tui_find_disassembly_address (struct gdbarch *gdbarch, CORE_ADDR pc, int from)
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{
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CORE_ADDR new_low;
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int max_lines;
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max_lines = (from > 0) ? from : - from;
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if (max_lines == 0)
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return pc;
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std::vector<tui_asm_line> asm_lines;
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new_low = pc;
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if (from > 0)
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{
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/* Always disassemble 1 extra instruction here, then if the last
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instruction fails to disassemble we will take the address of the
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previous instruction that did disassemble as the result. */
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tui_disassemble (gdbarch, asm_lines, pc, max_lines + 1);
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new_low = asm_lines.back ().addr;
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}
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else
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{
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/* In order to disassemble backwards we need to find a suitable
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address to start disassembling from and then work forward until we
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re-find the address we're currently at. We can then figure out
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which address will be at the top of the TUI window after our
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backward scroll. During our backward disassemble we need to be
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able to distinguish between the case where the last address we
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_can_ disassemble is ADDR, and the case where the disassembly
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just happens to stop at ADDR, for this reason we increase
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MAX_LINES by one. */
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max_lines++;
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/* When we disassemble a series of instructions this will hold the
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address of the last instruction disassembled. */
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CORE_ADDR last_addr;
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/* And this will hold the address of the next instruction that would
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have been disassembled. */
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CORE_ADDR next_addr;
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/* As we search backward if we find an address that looks like a
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promising starting point then we record it in this structure. If
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the next address we try is not a suitable starting point then we
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will fall back to the address held here. */
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gdb::optional<CORE_ADDR> possible_new_low;
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/* The previous value of NEW_LOW so we know if the new value is
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different or not. */
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CORE_ADDR prev_low;
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do
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{
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/* Find an address from which we can start disassembling. */
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prev_low = new_low;
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new_low = tui_find_backward_disassembly_start_address (new_low);
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/* Disassemble forward. */
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next_addr = tui_disassemble (gdbarch, asm_lines, new_low, max_lines);
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last_addr = asm_lines.back ().addr;
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/* If disassembling from the current value of NEW_LOW reached PC
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(or went past it) then this would do as a starting point if we
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can't find anything better, so remember it. */
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if (last_addr >= pc && new_low != prev_low
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&& asm_lines.size () >= max_lines)
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possible_new_low.emplace (new_low);
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/* Continue searching until we find a value of NEW_LOW from which
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disassembling MAX_LINES instructions doesn't reach PC. We
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know this means we can find the required number of previous
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instructions then. */
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}
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while ((last_addr > pc
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|| (last_addr == pc && asm_lines.size () < max_lines))
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&& new_low != prev_low);
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/* If we failed to disassemble the required number of lines then the
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following walk forward is not going to work, it assumes that
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ASM_LINES contains exactly MAX_LINES entries. Instead we should
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consider falling back to a previous possible start address in
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POSSIBLE_NEW_LOW. */
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if (asm_lines.size () < max_lines)
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{
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if (!possible_new_low.has_value ())
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return new_low;
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/* Take the best possible match we have. */
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new_low = *possible_new_low;
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next_addr = tui_disassemble (gdbarch, asm_lines, new_low, max_lines);
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last_addr = asm_lines.back ().addr;
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gdb_assert (asm_lines.size () >= max_lines);
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}
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/* Scan forward disassembling one instruction at a time until
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the last visible instruction of the window matches the pc.
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We keep the disassembled instructions in the 'lines' window
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and shift it downward (increasing its addresses). */
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int pos = max_lines - 1;
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if (last_addr < pc)
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do
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{
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pos++;
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if (pos >= max_lines)
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pos = 0;
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CORE_ADDR old_next_addr = next_addr;
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std::vector<tui_asm_line> single_asm_line;
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next_addr = tui_disassemble (gdbarch, single_asm_line,
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next_addr, 1);
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/* If there are some problems while disassembling exit. */
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if (next_addr <= old_next_addr)
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return pc;
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gdb_assert (single_asm_line.size () == 1);
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asm_lines[pos] = single_asm_line[0];
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} while (next_addr <= pc);
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pos++;
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if (pos >= max_lines)
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pos = 0;
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new_low = asm_lines[pos].addr;
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/* When scrolling backward the addresses should move backward, or at
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the very least stay the same if we are at the first address that
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can be disassembled. */
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gdb_assert (new_low <= pc);
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}
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return new_low;
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}
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/* Function to set the disassembly window's content. */
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bool
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tui_disasm_window::set_contents (struct gdbarch *arch,
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const struct symtab_and_line &sal)
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{
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int i;
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int offset = m_horizontal_offset;
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int max_lines, line_width;
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CORE_ADDR cur_pc;
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struct tui_locator_window *locator = tui_locator_win_info_ptr ();
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int tab_len = tui_tab_width;
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int insn_pos;
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CORE_ADDR pc = sal.pc;
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if (pc == 0)
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return false;
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m_gdbarch = arch;
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m_start_line_or_addr.loa = LOA_ADDRESS;
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m_start_line_or_addr.u.addr = pc;
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cur_pc = locator->addr;
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/* Window size, excluding highlight box. */
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max_lines = height - 2;
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line_width = width - TUI_EXECINFO_SIZE - 2;
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/* Get temporary table that will hold all strings (addr & insn). */
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std::vector<tui_asm_line> asm_lines;
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size_t addr_size = 0;
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tui_disassemble (m_gdbarch, asm_lines, pc, max_lines, &addr_size);
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/* Align instructions to the same column. */
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insn_pos = (1 + (addr_size / tab_len)) * tab_len;
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/* Now construct each line. */
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m_content.resize (max_lines);
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for (i = 0; i < max_lines; i++)
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{
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tui_source_element *src = &m_content[i];
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std::string line;
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CORE_ADDR addr;
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if (i < asm_lines.size ())
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{
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line
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= (asm_lines[i].addr_string
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+ n_spaces (insn_pos - asm_lines[i].addr_size)
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+ asm_lines[i].insn);
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addr = asm_lines[i].addr;
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}
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else
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{
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line = "";
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addr = 0;
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}
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const char *ptr = line.c_str ();
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src->line = tui_copy_source_line (&ptr, -1, offset, line_width, 0);
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src->line_or_addr.loa = LOA_ADDRESS;
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src->line_or_addr.u.addr = addr;
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src->is_exec_point = (addr == cur_pc && line.size () > 0);
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}
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return true;
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}
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void
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tui_get_begin_asm_address (struct gdbarch **gdbarch_p, CORE_ADDR *addr_p)
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{
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struct tui_locator_window *locator;
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struct gdbarch *gdbarch = get_current_arch ();
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CORE_ADDR addr = 0;
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locator = tui_locator_win_info_ptr ();
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if (locator->addr == 0)
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{
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if (have_full_symbols () || have_partial_symbols ())
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{
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set_default_source_symtab_and_line ();
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struct symtab_and_line sal = get_current_source_symtab_and_line ();
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if (sal.symtab != nullptr)
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find_line_pc (sal.symtab, sal.line, &addr);
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}
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if (addr == 0)
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{
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struct bound_minimal_symbol main_symbol
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= lookup_minimal_symbol (main_name (), nullptr, nullptr);
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if (main_symbol.minsym != nullptr)
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addr = BMSYMBOL_VALUE_ADDRESS (main_symbol);
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}
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}
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else /* The target is executing. */
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{
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gdbarch = locator->gdbarch;
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addr = locator->addr;
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}
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*gdbarch_p = gdbarch;
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*addr_p = addr;
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}
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/* Determine what the low address will be to display in the TUI's
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disassembly window. This may or may not be the same as the low
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address input. */
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CORE_ADDR
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tui_get_low_disassembly_address (struct gdbarch *gdbarch,
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CORE_ADDR low, CORE_ADDR pc)
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{
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int pos;
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/* Determine where to start the disassembly so that the pc is about
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in the middle of the viewport. */
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if (TUI_DISASM_WIN != NULL)
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pos = TUI_DISASM_WIN->height;
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else if (TUI_CMD_WIN == NULL)
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pos = tui_term_height () / 2 - 2;
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else
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pos = tui_term_height () - TUI_CMD_WIN->height - 2;
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pos = (pos - 2) / 2;
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pc = tui_find_disassembly_address (gdbarch, pc, -pos);
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if (pc < low)
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pc = low;
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return pc;
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}
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/* Scroll the disassembly forward or backward vertically. */
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void
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tui_disasm_window::do_scroll_vertical (int num_to_scroll)
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{
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if (!m_content.empty ())
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{
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CORE_ADDR pc;
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pc = m_start_line_or_addr.u.addr;
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symtab_and_line sal {};
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sal.pspace = current_program_space;
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sal.pc = tui_find_disassembly_address (m_gdbarch, pc, num_to_scroll);
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update_source_window_as_is (m_gdbarch, sal);
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}
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}
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bool
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tui_disasm_window::location_matches_p (struct bp_location *loc, int line_no)
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{
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return (m_content[line_no].line_or_addr.loa == LOA_ADDRESS
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&& m_content[line_no].line_or_addr.u.addr == loc->address);
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}
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bool
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tui_disasm_window::addr_is_displayed (CORE_ADDR addr) const
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{
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if (m_content.size () < SCROLL_THRESHOLD)
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return false;
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|
|
|
for (size_t i = 0; i < m_content.size () - SCROLL_THRESHOLD; ++i)
|
|
{
|
|
if (m_content[i].line_or_addr.loa == LOA_ADDRESS
|
|
&& m_content[i].line_or_addr.u.addr == addr)
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void
|
|
tui_disasm_window::maybe_update (struct frame_info *fi, symtab_and_line sal)
|
|
{
|
|
CORE_ADDR low;
|
|
|
|
struct gdbarch *frame_arch = get_frame_arch (fi);
|
|
|
|
if (find_pc_partial_function (sal.pc, NULL, &low, NULL) == 0)
|
|
{
|
|
/* There is no symbol available for current PC. There is no
|
|
safe way how to "disassemble backwards". */
|
|
low = sal.pc;
|
|
}
|
|
else
|
|
low = tui_get_low_disassembly_address (frame_arch, low, sal.pc);
|
|
|
|
struct tui_line_or_address a;
|
|
|
|
a.loa = LOA_ADDRESS;
|
|
a.u.addr = low;
|
|
if (!addr_is_displayed (sal.pc))
|
|
{
|
|
sal.pc = low;
|
|
update_source_window (frame_arch, sal);
|
|
}
|
|
else
|
|
{
|
|
a.u.addr = sal.pc;
|
|
set_is_exec_point_at (a);
|
|
}
|
|
}
|
|
|
|
void
|
|
tui_disasm_window::display_start_addr (struct gdbarch **gdbarch_p,
|
|
CORE_ADDR *addr_p)
|
|
{
|
|
*gdbarch_p = m_gdbarch;
|
|
*addr_p = m_start_line_or_addr.u.addr;
|
|
}
|