395 lines
10 KiB
C
395 lines
10 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 set the disassembly window's content.
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Disassemble count lines starting at pc.
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Return address of the count'th instruction after pc. */
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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 pos, 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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/* Now construct each line. */
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for (int i = 0; i < count; ++i)
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{
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print_address (gdbarch, pc, &gdb_dis_out);
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asm_lines[pos + i].addr = pc;
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asm_lines[pos + i].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 (asm_lines[pos + i].addr_string);
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else
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new_size = asm_lines[pos + i].addr_string.size ();
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*addr_size = std::max (*addr_size, new_size);
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asm_lines[pos + i].addr_size = new_size;
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}
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pc = pc + gdb_print_insn (gdbarch, pc, &gdb_dis_out, NULL);
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asm_lines[pos + i].insn = std::move (gdb_dis_out.string ());
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/* Reset the buffer to empty. */
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gdb_dis_out.clear ();
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}
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return pc;
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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 <= 1)
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return pc;
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std::vector<tui_asm_line> asm_lines (max_lines);
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new_low = pc;
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if (from > 0)
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{
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tui_disassemble (gdbarch, asm_lines, pc, 0, max_lines);
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new_low = asm_lines[max_lines - 1].addr;
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}
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else
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{
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CORE_ADDR last_addr;
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int pos;
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struct bound_minimal_symbol msymbol;
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/* Find backward an address which is a symbol and for which
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disassembling from that address will fill completely the
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window. */
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pos = max_lines - 1;
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do {
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new_low -= 1 * max_lines;
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msymbol = lookup_minimal_symbol_by_pc_section (new_low, 0);
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if (msymbol.minsym)
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new_low = BMSYMBOL_VALUE_ADDRESS (msymbol);
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else
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new_low += 1 * max_lines;
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tui_disassemble (gdbarch, asm_lines, new_low, 0, max_lines);
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last_addr = asm_lines[pos].addr;
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} while (last_addr > pc && msymbol.minsym);
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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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if (last_addr < pc)
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do
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{
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CORE_ADDR next_addr;
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pos++;
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if (pos >= max_lines)
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pos = 0;
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next_addr = tui_disassemble (gdbarch, asm_lines,
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last_addr, pos, 1);
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/* If there are some problems while disassembling exit. */
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if (next_addr <= last_addr)
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break;
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last_addr = next_addr;
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} while (last_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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}
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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 = 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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gdbarch = arch;
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start_line_or_addr.loa = LOA_ADDRESS;
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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 (max_lines);
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size_t addr_size = 0;
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tui_disassemble (gdbarch, asm_lines, pc, 0, 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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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 = &content[i];
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std::string 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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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 = asm_lines[i].addr;
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src->is_exec_point = asm_lines[i].addr == cur_pc;
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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_win_list[DISASSEM_WIN] != NULL)
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pos = tui_win_list[DISASSEM_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 (!content.empty ())
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{
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CORE_ADDR pc;
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pc = start_line_or_addr.u.addr;
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if (num_to_scroll >= 0)
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num_to_scroll++;
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else
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--num_to_scroll;
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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 (gdbarch, pc, num_to_scroll);
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update_source_window_as_is (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 (content[line_no].line_or_addr.loa == LOA_ADDRESS
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&& 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 (content.size () < SCROLL_THRESHOLD)
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return false;
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for (size_t i = 0; i < content.size () - SCROLL_THRESHOLD; ++i)
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{
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if (content[i].line_or_addr.loa == LOA_ADDRESS
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&& content[i].line_or_addr.u.addr == addr)
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return true;
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}
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return false;
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}
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void
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tui_disasm_window::maybe_update (struct frame_info *fi, symtab_and_line sal)
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{
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CORE_ADDR low;
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struct gdbarch *frame_arch = get_frame_arch (fi);
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if (find_pc_partial_function (sal.pc, NULL, &low, NULL) == 0)
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{
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/* There is no symbol available for current PC. There is no
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safe way how to "disassemble backwards". */
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low = sal.pc;
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}
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else
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low = tui_get_low_disassembly_address (frame_arch, low, sal.pc);
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struct tui_line_or_address a;
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a.loa = LOA_ADDRESS;
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a.u.addr = low;
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if (!addr_is_displayed (sal.pc))
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{
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sal.pc = low;
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update_source_window (frame_arch, sal);
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}
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else
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{
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a.u.addr = sal.pc;
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set_is_exec_point_at (a);
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}
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}
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