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author	Samuel Thibault <samuel.thibault@gnu.org>	2021-01-07 16:47:36 +0000
committer	Nick Clifton <nickc@redhat.com>	2021-01-07 16:47:36 +0000
commit	f478212851a25cd9849ad7f41112d08f91ab308b (patch)
tree	fd88d6bf193a795cbff056f40f9dc5cf19943d84 /opcodes/configure
parent	1b0927db3cf97297138179c68cb4798cc505eb39 (diff)
download	gdb-f478212851a25cd9849ad7f41112d08f91ab308b.zip gdb-f478212851a25cd9849ad7f41112d08f91ab308b.tar.gz gdb-f478212851a25cd9849ad7f41112d08f91ab308b.tar.bz2

libtool.m4: update GNU/Hurd test from upstream. In upstream libtool, 47a889a4ca20 ("Improve GNU/Hurd support.") fixed detection of shlibpath_overrides_runpath, thus avoiding unnecessary relink. This backports it.

. * libtool.m4: Match gnu* along other GNU systems. */ChangeLog: * configure: Re-generate.

Diffstat (limited to 'opcodes/configure')

-rwxr-xr-x

opcodes/configure

1 files changed, 1 insertions, 11 deletions

/* Print values for GNU debugger GDB. Copyright (C) 1986-2024 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/>. */ #include "frame.h" #include "symtab.h" #include "gdbtypes.h" #include "value.h" #include "language.h" #include "c-lang.h" #include "expression.h" #include "gdbcore.h" #include "gdbcmd.h" #include "target.h" #include "breakpoint.h" #include "demangle.h" #include "gdb-demangle.h" #include "valprint.h" #include "annotate.h" #include "symfile.h" #include "objfiles.h" #include "completer.h" #include "ui-out.h" #include "block.h" #include "disasm.h" #include "target-float.h" #include "observable.h" #include "solist.h" #include "parser-defs.h" #include "charset.h" #include "arch-utils.h" #include "cli/cli-utils.h" #include "cli/cli-option.h" #include "cli/cli-script.h" #include "cli/cli-style.h" #include "gdbsupport/format.h" #include "source.h" #include "gdbsupport/byte-vector.h" #include <optional> #include "gdbsupport/gdb-safe-ctype.h" #include "gdbsupport/rsp-low.h" #include "inferior.h" /* Chain containing all defined memory-tag subcommands. */ static struct cmd_list_element *memory_tag_list; /* Last specified output format. */ static char last_format = 0; /* Last specified examination size. 'b', 'h', 'w' or `q'. */ static char last_size = 'w'; /* Last specified count for the 'x' command. */ static int last_count; /* Last specified tag-printing option. */ static bool last_print_tags = false; /* Default address to examine next, and associated architecture. */ static struct gdbarch *next_gdbarch; static CORE_ADDR next_address; /* Number of delay instructions following current disassembled insn. */ static int branch_delay_insns; /* Last address examined. */ static CORE_ADDR last_examine_address; /* Contents of last address examined. This is not valid past the end of the `x' command! */ static value_ref_ptr last_examine_value; /* Largest offset between a symbolic value and an address, that will be printed as `0x1234 <symbol+offset>'. */ static unsigned int max_symbolic_offset = UINT_MAX; static void show_max_symbolic_offset (struct ui_file *file, int from_tty, struct cmd_list_element *c, const char *value) { gdb_printf (file, _("The largest offset that will be " "printed in <symbol+1234> form is %s.\n"), value); } /* Append the source filename and linenumber of the symbol when printing a symbolic value as `<symbol at filename:linenum>' if set. */ static bool print_symbol_filename = false; static void show_print_symbol_filename (struct ui_file *file, int from_tty, struct cmd_list_element *c, const char *value) { gdb_printf (file, _("Printing of source filename and " "line number with <symbol> is %s.\n"), value); } /* Number of auto-display expression currently being displayed. So that we can disable it if we get a signal within it. -1 when not doing one. */ static int current_display_number; /* Last allocated display number. */ static int display_number; struct display { display (const char *exp_string_, expression_up &&exp_, const struct format_data &format_, struct program_space *pspace_, const struct block *block_) : exp_string (exp_string_), exp (std::move (exp_)), number (++display_number), format (format_), pspace (pspace_), block (block_), enabled_p (true) { } /* The expression as the user typed it. */ std::string exp_string; /* Expression to be evaluated and displayed. */ expression_up exp; /* Item number of this auto-display item. */ int number; /* Display format specified. */ struct format_data format; /* Program space associated with `block'. */ struct program_space *pspace; /* Innermost block required by this expression when evaluated. */ const struct block *block; /* Status of this display (enabled or disabled). */ bool enabled_p; }; /* Expressions whose values should be displayed automatically each time the program stops. */ static std::vector<std::unique_ptr<struct display>> all_displays; /* Prototypes for local functions. */ static void do_one_display (struct display *); /* Decode a format specification. *STRING_PTR should point to it. OFORMAT and OSIZE are used as defaults for the format and size if none are given in the format specification. If OSIZE is zero, then the size field of the returned value should be set only if a size is explicitly specified by the user. The structure returned describes all the data found in the specification. In addition, *STRING_PTR is advanced past the specification and past all whitespace following it. */ static struct format_data decode_format (const char **string_ptr, int oformat, int osize) { struct format_data val; const char *p = *string_ptr; val.format = '?'; val.size = '?'; val.count = 1; val.raw = 0; val.print_tags = false; if (*p == '-') { val.count = -1; p++; } if (*p >= '0' && *p <= '9') val.count *= atoi (p); while (*p >= '0' && *p <= '9') p++; /* Now process size or format letters that follow. */ while (1) { if (*p == 'b' || *p == 'h' || *p == 'w' || *p == 'g') val.size = *p++; else if (*p == 'r') { val.raw = 1; p++; } else if (*p == 'm') { val.print_tags = true; p++; } else if (*p >= 'a' && *p <= 'z') val.format = *p++; else break; } *string_ptr = skip_spaces (p); /* Set defaults for format and size if not specified. */ if (val.format == '?') { if (val.size == '?') { /* Neither has been specified. */ val.format = oformat; val.size = osize; } else /* If a size is specified, any format makes a reasonable default except 'i'. */ val.format = oformat == 'i' ? 'x' : oformat; } else if (val.size == '?') switch (val.format) { case 'a': /* Pick the appropriate size for an address. This is deferred until do_examine when we know the actual architecture to use. A special size value of 'a' is used to indicate this case. */ val.size = osize ? 'a' : osize; break; case 'f': /* Floating point has to be word or giantword. */ if (osize == 'w' || osize == 'g') val.size = osize; else /* Default it to giantword if the last used size is not appropriate. */ val.size = osize ? 'g' : osize; break; case 'c': /* Characters default to one byte. */ val.size = osize ? 'b' : osize; break; case 's': /* Display strings with byte size chars unless explicitly specified. */ val.size = '\0'; break; default: /* The default is the size most recently specified. */ val.size = osize; } return val; } /* Print value VAL on stream according to OPTIONS. Do not end with a newline. SIZE is the letter for the size of datum being printed. This is used to pad hex numbers so they line up. SIZE is 0 for print / output and set for examine. */ static void print_formatted (struct value *val, int size, const struct value_print_options *options, struct ui_file *stream) { struct type *type = check_typedef (val->type ()); int len = type->length (); if (val->lval () == lval_memory) next_address = val->address () + len; if (size) { switch (options->format) { case 's': { struct type *elttype = val->type (); next_address = (val->address () + val_print_string (elttype, NULL, val->address (), -1, stream, options) * len); } return; case 'i': /* We often wrap here if there are long symbolic names. */ stream->wrap_here (4); next_address = (val->address () + gdb_print_insn (type->arch (), val->address (), stream, &branch_delay_insns)); return; } } if (options->format == 0 || options->format == 's' || type->code () == TYPE_CODE_VOID || type->code () == TYPE_CODE_REF || type->code () == TYPE_CODE_ARRAY || type->code () == TYPE_CODE_STRING || type->code () == TYPE_CODE_STRUCT || type->code () == TYPE_CODE_UNION || type->code () == TYPE_CODE_NAMESPACE) value_print (val, stream, options); else /* User specified format, so don't look to the type to tell us what to do. */ value_print_scalar_formatted (val, options, size, stream); } /* Return builtin floating point type of same length as TYPE. If no such type is found, return TYPE itself. */ static struct type * float_type_from_length (struct type *type) { struct gdbarch *gdbarch = type->arch (); const struct builtin_type *builtin = builtin_type (gdbarch); if (type->length () == builtin->builtin_half->length ()) type = builtin->builtin_half; else if (type->length () == builtin->builtin_float->length ()) type = builtin->builtin_float; else if (type->length () == builtin->builtin_double->length ()) type = builtin->builtin_double; else if (type->length () == builtin->builtin_long_double->length ()) type = builtin->builtin_long_double; return type; } /* Print a scalar of data of type TYPE, pointed to in GDB by VALADDR, according to OPTIONS and SIZE on STREAM. Formats s and i are not supported at this level. */ void print_scalar_formatted (const gdb_byte *valaddr, struct type *type, const struct value_print_options *options, int size, struct ui_file *stream) { struct gdbarch *gdbarch = type->arch (); unsigned int len = type->length (); enum bfd_endian byte_order = type_byte_order (type); /* String printing should go through val_print_scalar_formatted. */ gdb_assert (options->format != 's'); /* If the value is a pointer, and pointers and addresses are not the same, then at this point, the value's length (in target bytes) is gdbarch_addr_bit/TARGET_CHAR_BIT, not type->length (). */ if (type->code () == TYPE_CODE_PTR) len = gdbarch_addr_bit (gdbarch) / TARGET_CHAR_BIT; /* If we are printing it as unsigned, truncate it in case it is actually a negative signed value (e.g. "print/u (short)-1" should print 65535 (if shorts are 16 bits) instead of 4294967295). */ if (options->format != 'c' && (options->format != 'd' || type->is_unsigned ())) { if (len < type->length () && byte_order == BFD_ENDIAN_BIG) valaddr += type->length () - len; } /* Allow LEN == 0, and in this case, don't assume that VALADDR is valid. */ const gdb_byte zero = 0; if (len == 0) { len = 1; valaddr = &zero; } if (size != 0 && (options->format == 'x' || options->format == 't')) { /* Truncate to fit. */ unsigned newlen; switch (size) { case 'b': newlen = 1; break; case 'h': newlen = 2; break; case 'w': newlen = 4; break; case 'g': newlen = 8; break; default: error (_("Undefined output size \"%c\"."), size); } if (newlen < len && byte_order == BFD_ENDIAN_BIG) valaddr += len - newlen; len = newlen; } /* Biased range types and sub-word scalar types must be handled here; the value is correctly computed by unpack_long. */ gdb::byte_vector converted_bytes; /* Some cases below will unpack the value again. In the biased range case, we want to avoid this, so we store the unpacked value here for possible use later. */ std::optional<LONGEST> val_long; if ((is_fixed_point_type (type) && (options->format == 'o' || options->format == 'x' || options->format == 't' || options->format == 'z' || options->format == 'd' || options->format == 'u')) || (type->code () == TYPE_CODE_RANGE && type->bounds ()->bias != 0) || type->bit_size_differs_p ()) { val_long.emplace (unpack_long (type, valaddr)); converted_bytes.resize (type->length ()); store_signed_integer (converted_bytes.data (), type->length (), byte_order, *val_long); valaddr = converted_bytes.data (); } /* Printing a non-float type as 'f' will interpret the data as if it were of a floating-point type of the same length, if that exists. Otherwise, the data is printed as integer. */ char format = options->format; if (format == 'f' && type->code () != TYPE_CODE_FLT) { type = float_type_from_length (type); if (type->code () != TYPE_CODE_FLT) format = 0; } switch (format) { case 'o': print_octal_chars (stream, valaddr, len, byte_order); break; case 'd': print_decimal_chars (stream, valaddr, len, true, byte_order); break; case 'u': print_decimal_chars (stream, valaddr, len, false, byte_order); break; case 0: if (type->code () != TYPE_CODE_FLT) { print_decimal_chars (stream, valaddr, len, !type->is_unsigned (), byte_order); break; } [[fallthrough]]; case 'f': print_floating (valaddr, type, stream); break; case 't': print_binary_chars (stream, valaddr, len, byte_order, size > 0, options); break; case 'x': print_hex_chars (stream, valaddr, len, byte_order, size > 0); break; case 'z': print_hex_chars (stream, valaddr, len, byte_order, true); break; case 'c': { struct value_print_options opts = *options; if (!val_long.has_value ()) val_long.emplace (unpack_long (type, valaddr)); opts.format = 0; if (type->is_unsigned ()) type = builtin_type (gdbarch)->builtin_true_unsigned_char; else type = builtin_type (gdbarch)->builtin_true_char; value_print (value_from_longest (type, *val_long), stream, &opts); } break; case 'a': { if (!val_long.has_value ()) val_long.emplace (unpack_long (type, valaddr)); print_address (gdbarch, *val_long, stream); } break; default: error (_("Undefined output format \"%c\"."), format); } } /* Specify default address for `x' command. The `info lines' command uses this. */ void set_next_address (struct gdbarch *gdbarch, CORE_ADDR addr) { struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr; next_gdbarch = gdbarch; next_address = addr; /* Make address available to the user as $_. */ set_internalvar (lookup_internalvar ("_"), value_from_pointer (ptr_type, addr)); } /* Optionally print address ADDR symbolically as <SYMBOL+OFFSET> on STREAM, after LEADIN. Print nothing if no symbolic name is found nearby. Optionally also print source file and line number, if available. DO_DEMANGLE controls whether to print a symbol in its native "raw" form, or to interpret it as a possible C++ name and convert it back to source form. However note that DO_DEMANGLE can be overridden by the specific settings of the demangle and asm_demangle variables. Returns non-zero if anything was printed; zero otherwise. */ int print_address_symbolic (struct gdbarch *gdbarch, CORE_ADDR addr, struct ui_file *stream, int do_demangle, const char *leadin) { std::string name, filename; int unmapped = 0; int offset = 0; int line = 0; if (build_address_symbolic (gdbarch, addr, do_demangle, false, &name, &offset, &filename, &line, &unmapped)) return 0; gdb_puts (leadin, stream); if (unmapped) gdb_puts ("<*", stream); else gdb_puts ("<", stream); fputs_styled (name.c_str (), function_name_style.style (), stream); if (offset != 0) gdb_printf (stream, "%+d", offset); /* Append source filename and line number if desired. Give specific line # of this addr, if we have it; else line # of the nearest symbol. */ if (print_symbol_filename && !filename.empty ()) { gdb_puts (line == -1 ? " in " : " at ", stream); fputs_styled (filename.c_str (), file_name_style.style (), stream); if (line != -1) gdb_printf (stream, ":%d", line); } if (unmapped) gdb_puts ("*>", stream); else gdb_puts (">", stream); return 1; } /* See valprint.h. */ int build_address_symbolic (struct gdbarch *gdbarch, CORE_ADDR addr, /* IN */ bool do_demangle, /* IN */ bool prefer_sym_over_minsym, /* IN */ std::string *name, /* OUT */ int *offset, /* OUT */ std::string *filename, /* OUT */ int *line, /* OUT */ int *unmapped) /* OUT */ { struct bound_minimal_symbol msymbol; struct symbol *symbol; CORE_ADDR name_location = 0; struct obj_section *section = NULL; const char *name_temp = ""; /* Let's say it is mapped (not unmapped). */ *unmapped = 0; /* Determine if the address is in an overlay, and whether it is mapped. */ if (overlay_debugging) { section = find_pc_overlay (addr); if (pc_in_unmapped_range (addr, section)) { *unmapped = 1; addr = overlay_mapped_address (addr, section); } } /* Try to find the address in both the symbol table and the minsyms. In most cases, we'll prefer to use the symbol instead of the minsym. However, there are cases (see below) where we'll choose to use the minsym instead. */ /* This is defective in the sense that it only finds text symbols. So really this is kind of pointless--we should make sure that the minimal symbols have everything we need (by changing that we could save some memory, but for many debug format--ELF/DWARF or anything/stabs--it would be inconvenient to eliminate those minimal symbols anyway). */ msymbol = lookup_minimal_symbol_by_pc_section (addr, section); symbol = find_pc_sect_function (addr, section); if (symbol) { /* If this is a function (i.e. a code address), strip out any non-address bits. For instance, display a pointer to the first instruction of a Thumb function as <function>; the second instruction will be <function+2>, even though the pointer is <function+3>. This matches the ISA behavior. */ addr = gdbarch_addr_bits_remove (gdbarch, addr); name_location = symbol->value_block ()->entry_pc (); if (do_demangle || asm_demangle) name_temp = symbol->print_name (); else name_temp = symbol->linkage_name (); } if (msymbol.minsym != NULL && msymbol.minsym->has_size () && msymbol.minsym->size () == 0 && msymbol.minsym->type () != mst_text && msymbol.minsym->type () != mst_text_gnu_ifunc && msymbol.minsym->type () != mst_file_text) msymbol.minsym = NULL; if (msymbol.minsym != NULL) { /* Use the minsym if no symbol is found. Additionally, use the minsym instead of a (found) symbol if the following conditions all hold: 1) The prefer_sym_over_minsym flag is false. 2) The minsym address is identical to that of the address under consideration. 3) The symbol address is not identical to that of the address under consideration. */ if (symbol == NULL || (!prefer_sym_over_minsym && msymbol.value_address () == addr && name_location != addr)) { /* If this is a function (i.e. a code address), strip out any non-address bits. For instance, display a pointer to the first instruction of a Thumb function as <function>; the second instruction will be <function+2>, even though the pointer is <function+3>. This matches the ISA behavior. */ if (msymbol.minsym->type () == mst_text || msymbol.minsym->type () == mst_text_gnu_ifunc || msymbol.minsym->type () == mst_file_text || msymbol.minsym->type () == mst_solib_trampoline) addr = gdbarch_addr_bits_remove (gdbarch, addr); symbol = 0; name_location = msymbol.value_address (); if (do_demangle || asm_demangle) name_temp = msymbol.minsym->print_name (); else name_temp = msymbol.minsym->linkage_name (); } } if (symbol == NULL && msymbol.minsym == NULL) return 1; /* If the nearest symbol is too far away, don't print anything symbolic. */ /* For when CORE_ADDR is larger than unsigned int, we do math in CORE_ADDR. But when we detect unsigned wraparound in the CORE_ADDR math, we ignore this test and print the offset, because addr+max_symbolic_offset has wrapped through the end of the address space back to the beginning, giving bogus comparison. */ if (addr > name_location + max_symbolic_offset && name_location + max_symbolic_offset > name_location) return 1; *offset = (LONGEST) addr - name_location; *name = name_temp; if (print_symbol_filename) { struct symtab_and_line sal; sal = find_pc_sect_line (addr, section, 0); if (sal.symtab) { *filename = symtab_to_filename_for_display (sal.symtab); *line = sal.line; } } return 0; } /* Print address ADDR symbolically on STREAM. First print it as a number. Then perhaps print <SYMBOL + OFFSET> after the number. */ void print_address (struct gdbarch *gdbarch, CORE_ADDR addr, struct ui_file *stream) { fputs_styled (paddress (gdbarch, addr), address_style.style (), stream); print_address_symbolic (gdbarch, addr, stream, asm_demangle, " "); } /* Return a prefix for instruction address: "=> " for current instruction, else " ". */ const char * pc_prefix (CORE_ADDR addr) { if (has_stack_frames ()) { frame_info_ptr frame; CORE_ADDR pc; frame = get_selected_frame (NULL); if (get_frame_pc_if_available (frame, &pc) && pc == addr) return "=> "; } return " "; } /* Print address ADDR symbolically on STREAM. Parameter DEMANGLE controls whether to print the symbolic name "raw" or demangled. Return non-zero if anything was printed; zero otherwise. */ int print_address_demangle (const struct value_print_options *opts, struct gdbarch *gdbarch, CORE_ADDR addr, struct ui_file *stream, int do_demangle) { if (opts->addressprint) { fputs_styled (paddress (gdbarch, addr), address_style.style (), stream); print_address_symbolic (gdbarch, addr, stream, do_demangle, " "); } else { return print_address_symbolic (gdbarch, addr, stream, do_demangle, ""); } return 1; } /* Find the address of the instruction that is INST_COUNT instructions before the instruction at ADDR. Since some architectures have variable-length instructions, we can't just simply subtract INST_COUNT * INSN_LEN from ADDR. Instead, we use line number information to locate the nearest known instruction boundary, and disassemble forward from there. If we go out of the symbol range during disassembling, we return the lowest address we've got so far and set the number of instructions read to INST_READ. */ static CORE_ADDR find_instruction_backward (struct gdbarch *gdbarch, CORE_ADDR addr, int inst_count, int *inst_read) { /* The vector PCS is used to store instruction addresses within a pc range. */ CORE_ADDR loop_start, loop_end, p; std::vector<CORE_ADDR> pcs; struct symtab_and_line sal; *inst_read = 0; loop_start = loop_end = addr; /* In each iteration of the outer loop, we get a pc range that ends before LOOP_START, then we count and store every instruction address of the range iterated in the loop. If the number of instructions counted reaches INST_COUNT, return the stored address that is located INST_COUNT instructions back from ADDR. If INST_COUNT is not reached, we subtract the number of counted instructions from INST_COUNT, and go to the next iteration. */ do { pcs.clear (); sal = find_pc_sect_line (loop_start, NULL, 1); if (sal.line <= 0) { /* We reach here when line info is not available. In this case, we print a message and just exit the loop. The return value is calculated after the loop. */ gdb_printf (_("No line number information available " "for address ")); gdb_stdout->wrap_here (2); print_address (gdbarch, loop_start - 1, gdb_stdout); gdb_printf ("\n"); break; } loop_end = loop_start; loop_start = sal.pc; /* This loop pushes instruction addresses in the range from LOOP_START to LOOP_END. */ for (p = loop_start; p < loop_end;) { pcs.push_back (p); p += gdb_insn_length (gdbarch, p); } inst_count -= pcs.size (); *inst_read += pcs.size (); } while (inst_count > 0); /* After the loop, the vector PCS has instruction addresses of the last source line we processed, and INST_COUNT has a negative value. We return the address at the index of -INST_COUNT in the vector for the reason below. Let's assume the following instruction addresses and run 'x/-4i 0x400e'. Line X of File 0x4000 0x4001 0x4005 Line Y of File 0x4009 0x400c => 0x400e 0x4011 find_instruction_backward is called with INST_COUNT = 4 and expected to return 0x4001. When we reach here, INST_COUNT is set to -1 because it was subtracted by 2 (from Line Y) and 3 (from Line X). The value 4001 is located at the index 1 of the last iterated line (= Line X), which is simply calculated by -INST_COUNT. The case when the length of PCS is 0 means that we reached an area for which line info is not available. In such case, we return LOOP_START, which was the lowest instruction address that had line info. */ p = pcs.size () > 0 ? pcs[-inst_count] : loop_start; /* INST_READ includes all instruction addresses in a pc range. Need to exclude the beginning part up to the address we're returning. That is, exclude {0x4000} in the example above. */ if (inst_count < 0) *inst_read += inst_count; return p; } /* Backward read LEN bytes of target memory from address MEMADDR + LEN, placing the results in GDB's memory from MYADDR + LEN. Returns a count of the bytes actually read. */ static int read_memory_backward (struct gdbarch *gdbarch, CORE_ADDR memaddr, gdb_byte *myaddr, int len) { int errcode; int nread; /* Number of bytes actually read. */ /* First try a complete read. */ errcode = target_read_memory (memaddr, myaddr, len); if (errcode == 0) { /* Got it all. */ nread = len; } else { /* Loop, reading one byte at a time until we get as much as we can. */ memaddr += len; myaddr += len; for (nread = 0; nread < len; ++nread) { errcode = target_read_memory (--memaddr, --myaddr, 1); if (errcode != 0) { /* The read was unsuccessful, so exit the loop. */ gdb_printf (_("Cannot access memory at address %s\n"), paddress (gdbarch, memaddr)); break; } } } return nread; } /* Returns true if X (which is LEN bytes wide) is the number zero. */ static int integer_is_zero (const gdb_byte *x, int len) { int i = 0; while (i < len && x[i] == 0) ++i; return (i == len); } /* Find the start address of a string in which ADDR is included. Basically we search for '\0' and return the next address, but if OPTIONS->PRINT_MAX is smaller than the length of a string, we stop searching and return the address to print characters as many as PRINT_MAX from the string. */ static CORE_ADDR find_string_backward (struct gdbarch *gdbarch, CORE_ADDR addr, int count, int char_size, const struct value_print_options *options, int *strings_counted) { const int chunk_size = 0x20; int read_error = 0; int chars_read = 0; int chars_to_read = chunk_size; int chars_counted = 0; int count_original = count; CORE_ADDR string_start_addr = addr; gdb_assert (char_size == 1 || char_size == 2 || char_size == 4); gdb::byte_vector buffer (chars_to_read * char_size); while (count > 0 && read_error == 0) { int i; addr -= chars_to_read * char_size; chars_read = read_memory_backward (gdbarch, addr, buffer.data (), chars_to_read * char_size); chars_read /= char_size; read_error = (chars_read == chars_to_read) ? 0 : 1; unsigned int print_max_chars = get_print_max_chars (options); /* Searching for '\0' from the end of buffer in backward direction. */ for (i = 0; i < chars_read && count > 0 ; ++i, ++chars_counted) { int offset = (chars_to_read - i - 1) * char_size; if (integer_is_zero (&buffer[offset], char_size) || chars_counted == print_max_chars) { /* Found '\0' or reached `print_max_chars'. As OFFSET is the offset to '\0', we add CHAR_SIZE to return the start address of a string. */ --count; string_start_addr = addr + offset + char_size; chars_counted = 0; } } } /* Update STRINGS_COUNTED with the actual number of loaded strings. */ *strings_counted = count_original - count; if (read_error != 0) { /* In error case, STRING_START_ADDR is pointing to the string that was last successfully loaded. Rewind the partially loaded string. */ string_start_addr -= chars_counted * char_size; } return string_start_addr; } /* Examine data at address ADDR in format FMT. Fetch it from memory and print on gdb_stdout. */ static void do_examine (struct format_data fmt, struct gdbarch *gdbarch, CORE_ADDR addr) { char format = 0; char size; int count = 1; struct type *val_type = NULL; int i; int maxelts; struct value_print_options opts; int need_to_update_next_address = 0; CORE_ADDR addr_rewound = 0; format = fmt.format; size = fmt.size; count = fmt.count; next_gdbarch = gdbarch; next_address = addr; /* Instruction format implies fetch single bytes regardless of the specified size. The case of strings is handled in decode_format, only explicit size operator are not changed to 'b'. */ if (format == 'i') size = 'b'; if (size == 'a') { /* Pick the appropriate size for an address. */ if (gdbarch_ptr_bit (next_gdbarch) == 64) size = 'g'; else if (gdbarch_ptr_bit (next_gdbarch) == 32) size = 'w'; else if (gdbarch_ptr_bit (next_gdbarch) == 16) size = 'h'; else /* Bad value for gdbarch_ptr_bit. */ internal_error (_("failed internal consistency check")); } if (size == 'b') val_type = builtin_type (next_gdbarch)->builtin_int8; else if (size == 'h') val_type = builtin_type (next_gdbarch)->builtin_int16; else if (size == 'w') val_type = builtin_type (next_gdbarch)->builtin_int32; else if (size == 'g') val_type = builtin_type (next_gdbarch)->builtin_int64; if (format == 's') { struct type *char_type = NULL; /* Search for "char16_t" or "char32_t" types or fall back to 8-bit char if type is not found. */ if (size == 'h') char_type = builtin_type (next_gdbarch)->builtin_char16; else if (size == 'w') char_type = builtin_type (next_gdbarch)->builtin_char32; if (char_type) val_type = char_type; else { if (size != '\0' && size != 'b') warning (_("Unable to display strings with " "size '%c', using 'b' instead."), size); size = 'b'; val_type = builtin_type (next_gdbarch)->builtin_int8; } } maxelts = 8; if (size == 'w') maxelts = 4; if (size == 'g') maxelts = 2; if (format == 's' || format == 'i') maxelts = 1; get_formatted_print_options (&opts, format); if (count < 0) { /* This is the negative repeat count case. We rewind the address based on the given repeat count and format, then examine memory from there in forward direction. */ count = -count; if (format == 'i') { next_address = find_instruction_backward (gdbarch, addr, count, &count); } else if (format == 's') { next_address = find_string_backward (gdbarch, addr, count, val_type->length (), &opts, &count); } else { next_address = addr - count * val_type->length (); } /* The following call to print_formatted updates next_address in every iteration. In backward case, we store the start address here and update next_address with it before exiting the function. */ addr_rewound = (format == 's' ? next_address - val_type->length () : next_address); need_to_update_next_address = 1; } /* Whether we need to print the memory tag information for the current address range. */ bool print_range_tag = true; uint32_t gsize = gdbarch_memtag_granule_size (gdbarch); /* Print as many objects as specified in COUNT, at most maxelts per line, with the address of the next one at the start of each line. */ while (count > 0) { QUIT; CORE_ADDR tag_laddr = 0, tag_haddr = 0; /* Print the memory tag information if requested. */ if (fmt.print_tags && print_range_tag && target_supports_memory_tagging ()) { tag_laddr = align_down (next_address, gsize); tag_haddr = align_down (next_address + gsize, gsize); struct value *v_addr = value_from_ulongest (builtin_type (gdbarch)->builtin_data_ptr, tag_laddr); if (gdbarch_tagged_address_p (current_inferior ()->arch (), v_addr)) { /* Fetch the allocation tag. */ struct value *tag = gdbarch_get_memtag (gdbarch, v_addr, memtag_type::allocation); std::string atag = gdbarch_memtag_to_string (gdbarch, tag); if (!atag.empty ()) { gdb_printf (_("<Allocation Tag %s for range [%s,%s)>\n"), atag.c_str (), paddress (gdbarch, tag_laddr), paddress (gdbarch, tag_haddr)); } } print_range_tag = false; } if (format == 'i') gdb_puts (pc_prefix (next_address)); print_address (next_gdbarch, next_address, gdb_stdout); gdb_printf (":"); for (i = maxelts; i > 0 && count > 0; i--, count--) { gdb_printf ("\t"); /* Note that print_formatted sets next_address for the next object. */ last_examine_address = next_address; /* The value to be displayed is not fetched greedily. Instead, to avoid the possibility of a fetched value not being used, its retrieval is delayed until the print code uses it. When examining an instruction stream, the disassembler will perform its own memory fetch using just the address stored in LAST_EXAMINE_VALUE. FIXME: Should the disassembler be modified so that LAST_EXAMINE_VALUE is left with the byte sequence from the last complete instruction fetched from memory? */ last_examine_value = release_value (value_at_lazy (val_type, next_address)); print_formatted (last_examine_value.get (), size, &opts, gdb_stdout); /* Display any branch delay slots following the final insn. */ if (format == 'i' && count == 1) count += branch_delay_insns; /* Update the tag range based on the current address being processed. */ if (tag_haddr <= next_address) print_range_tag = true; } gdb_printf ("\n"); } if (need_to_update_next_address) next_address = addr_rewound; } static void validate_format (struct format_data fmt, const char *cmdname) { if (fmt.size != 0) error (_("Size letters are meaningless in \"%s\" command."), cmdname); if (fmt.count != 1) error (_("Item count other than 1 is meaningless in \"%s\" command."), cmdname); if (fmt.format == 'i') error (_("Format letter \"%c\" is meaningless in \"%s\" command."), fmt.format, cmdname); } /* Parse print command format string into *OPTS and update *EXPP. CMDNAME should name the current command. */ void print_command_parse_format (const char **expp, const char *cmdname, value_print_options *opts) { const char *exp = *expp; /* opts->raw value might already have been set by 'set print raw-values' or by using 'print -raw-values'. So, do not set opts->raw to 0, only set it to 1 if /r is given. */ if (exp && *exp == '/') { format_data fmt; exp++; fmt = decode_format (&exp, last_format, 0); validate_format (fmt, cmdname); last_format = fmt.format; opts->format = fmt.format; opts->raw = opts->raw || fmt.raw; } else { opts->format = 0; } *expp = exp; } /* See valprint.h. */ void print_value (value *val, const value_print_options &opts) { /* This setting allows large arrays to be printed by limiting the number of elements that are loaded into GDB's memory; we only need to load as many array elements as we plan to print. */ scoped_array_length_limiting limit_large_arrays (opts.print_max); int histindex = val->record_latest (); annotate_value_history_begin (histindex, val->type ()); std::string idx = string_printf ("$%d", histindex); gdb_printf ("%ps = ", styled_string (variable_name_style.style (), idx.c_str ())); annotate_value_history_value (); print_formatted (val, 0, &opts, gdb_stdout); gdb_printf ("\n"); annotate_value_history_end (); } /* Returns true if memory tags should be validated. False otherwise. */ static bool should_validate_memtags (struct value *value) { gdb_assert (value != nullptr && value->type () != nullptr); if (!target_supports_memory_tagging ()) return false; enum type_code code = value->type ()->code (); /* Skip non-address values. */ if (code != TYPE_CODE_PTR && !TYPE_IS_REFERENCE (value->type ())) return false; /* OK, we have an address value. Check we have a complete value we can extract. */ if (value->optimized_out () || !value->entirely_available ()) return false; /* We do. Check whether it includes any tags. */ return gdbarch_tagged_address_p (current_inferior ()->arch (), value); } /* Helper for parsing arguments for print_command_1. */ static struct value * process_print_command_args (const char *args, value_print_options *print_opts, bool voidprint) { get_user_print_options (print_opts); /* Override global settings with explicit options, if any. */ auto group = make_value_print_options_def_group (print_opts); gdb::option::process_options (&args, gdb::option::PROCESS_OPTIONS_REQUIRE_DELIMITER, group); print_command_parse_format (&args, "print", print_opts); const char *exp = args; if (exp != nullptr && *exp) { /* This setting allows large arrays to be printed by limiting the number of elements that are loaded into GDB's memory; we only need to load as many array elements as we plan to print. */ scoped_array_length_limiting limit_large_arrays (print_opts->print_max); /* VOIDPRINT is true to indicate that we do want to print a void value, so invert it for parse_expression. */ parser_flags flags = 0; if (!voidprint) flags = PARSER_VOID_CONTEXT; expression_up expr = parse_expression (exp, nullptr, flags); return expr->evaluate (); } return access_value_history (0); } /* Implementation of the "print" and "call" commands. */ static void print_command_1 (const char *args, int voidprint) { value_print_options print_opts; struct value *val = process_print_command_args (args, &print_opts, voidprint); if (voidprint || (val && val->type () && val->type ()->code () != TYPE_CODE_VOID)) { /* If memory tagging validation is on, check if the tag is valid. */ if (print_opts.memory_tag_violations) { try { gdbarch *arch = current_inferior ()->arch (); if (should_validate_memtags (val) && !gdbarch_memtag_matches_p (arch, val)) { /* Fetch the logical tag. */ struct value *tag = gdbarch_get_memtag (arch, val, memtag_type::logical); std::string ltag = gdbarch_memtag_to_string (arch, tag); /* Fetch the allocation tag. */ tag = gdbarch_get_memtag (arch, val, memtag_type::allocation); std::string atag = gdbarch_memtag_to_string (arch, tag); gdb_printf (_("Logical tag (%s) does not match the " "allocation tag (%s).\n"), ltag.c_str (), atag.c_str ()); } } catch (gdb_exception_error &ex) { if (ex.error == TARGET_CLOSE_ERROR) throw; gdb_printf (gdb_stderr, _("Could not validate memory tag: %s\n"), ex.message->c_str ()); } } print_value (val, print_opts); } } /* See valprint.h. */ void print_command_completer (struct cmd_list_element *ignore, completion_tracker &tracker, const char *text, const char * /*word*/) { const auto group = make_value_print_options_def_group (nullptr); if (gdb::option::complete_options (tracker, &text, gdb::option::PROCESS_OPTIONS_REQUIRE_DELIMITER, group)) return; if (skip_over_slash_fmt (tracker, &text)) return; const char *word = advance_to_expression_complete_word_point (tracker, text); expression_completer (ignore, tracker, text, word); } static void print_command (const char *exp, int from_tty) { print_command_1 (exp, true); } /* Same as print, except it doesn't print void results. */ static void call_command (const char *exp, int from_tty) { print_command_1 (exp, false); } /* Implementation of the "output" command. */ void output_command (const char *exp, int from_tty) { char format = 0; struct value *val; struct format_data fmt; struct value_print_options opts; fmt.size = 0; fmt.raw = 0; if (exp && *exp == '/') { exp++; fmt = decode_format (&exp, 0, 0); validate_format (fmt, "output"); format = fmt.format; } expression_up expr = parse_expression (exp); val = expr->evaluate (); annotate_value_begin (val->type ()); get_formatted_print_options (&opts, format); opts.raw = fmt.raw; /* This setting allows large arrays to be printed by limiting the number of elements that are loaded into GDB's memory; we only need to load as many array elements as we plan to print. */ scoped_array_length_limiting limit_large_arrays (opts.print_max); print_formatted (val, fmt.size, &opts, gdb_stdout); annotate_value_end (); gdb_flush (gdb_stdout); } static void set_command (const char *exp, int from_tty) { expression_up expr = parse_expression (exp); switch (expr->first_opcode ()) { case UNOP_PREINCREMENT: case UNOP_POSTINCREMENT: case UNOP_PREDECREMENT: case UNOP_POSTDECREMENT: case BINOP_ASSIGN: case BINOP_ASSIGN_MODIFY: case BINOP_COMMA: break; default: warning (_("Expression is not an assignment (and might have no effect)")); } expr->evaluate (); } static void info_symbol_command (const char *arg, int from_tty) { struct minimal_symbol *msymbol; CORE_ADDR addr, sect_addr; int matches = 0; unsigned int offset; if (!arg) error_no_arg (_("address")); addr = parse_and_eval_address (arg); for (objfile *objfile : current_program_space->objfiles ()) for (obj_section *osect : objfile->sections ()) { /* Only process each object file once, even if there's a separate debug file. */ if (objfile->separate_debug_objfile_backlink) continue; sect_addr = overlay_mapped_address (addr, osect); if (osect->contains (sect_addr) && (msymbol = lookup_minimal_symbol_by_pc_section (sect_addr, osect).minsym)) { const char *obj_name, *mapped, *sec_name, *msym_name; const char *loc_string; matches = 1; offset = sect_addr - msymbol->value_address (objfile); mapped = section_is_mapped (osect) ? _("mapped") : _("unmapped"); sec_name = osect->the_bfd_section->name; msym_name = msymbol->print_name (); /* Don't print the offset if it is zero. We assume there's no need to handle i18n of "sym + offset". */ std::string string_holder; if (offset) { string_holder = string_printf ("%s + %u", msym_name, offset); loc_string = string_holder.c_str (); } else loc_string = msym_name; gdb_assert (osect->objfile && objfile_name (osect->objfile)); obj_name = objfile_name (osect->objfile); if (current_program_space->multi_objfile_p ()) if (pc_in_unmapped_range (addr, osect)) if (section_is_overlay (osect)) gdb_printf (_("%s in load address range of " "%s overlay section %s of %s\n"), loc_string, mapped, sec_name, obj_name); else gdb_printf (_("%s in load address range of " "section %s of %s\n"), loc_string, sec_name, obj_name); else if (section_is_overlay (osect)) gdb_printf (_("%s in %s overlay section %s of %s\n"), loc_string, mapped, sec_name, obj_name); else gdb_printf (_("%s in section %s of %s\n"), loc_string, sec_name, obj_name); else if (pc_in_unmapped_range (addr, osect)) if (section_is_overlay (osect)) gdb_printf (_("%s in load address range of %s overlay " "section %s\n"), loc_string, mapped, sec_name); else gdb_printf (_("%s in load address range of section %s\n"), loc_string, sec_name); else if (section_is_overlay (osect)) gdb_printf (_("%s in %s overlay section %s\n"), loc_string, mapped, sec_name); else gdb_printf (_("%s in section %s\n"), loc_string, sec_name); } } if (matches == 0) gdb_printf (_("No symbol matches %s.\n"), arg); } static void info_address_command (const char *exp, int from_tty) { struct gdbarch *gdbarch; int regno; struct symbol *sym; struct bound_minimal_symbol msymbol; long val; struct obj_section *section; CORE_ADDR load_addr, context_pc = 0; struct field_of_this_result is_a_field_of_this; if (exp == 0) error (_("Argument required.")); sym = lookup_symbol (exp, get_selected_block (&context_pc), SEARCH_VFT, &is_a_field_of_this).symbol; if (sym == NULL) { if (is_a_field_of_this.type != NULL) { gdb_printf ("Symbol \""); fprintf_symbol (gdb_stdout, exp, current_language->la_language, DMGL_ANSI); gdb_printf ("\" is a field of the local class variable "); if (current_language->la_language == language_objc) gdb_printf ("`self'\n"); /* ObjC equivalent of "this" */ else gdb_printf ("`this'\n"); return; } msymbol = lookup_bound_minimal_symbol (exp); if (msymbol.minsym != NULL) { struct objfile *objfile = msymbol.objfile; gdbarch = objfile->arch (); load_addr = msymbol.value_address (); gdb_printf ("Symbol \""); fprintf_symbol (gdb_stdout, exp, current_language->la_language, DMGL_ANSI); gdb_printf ("\" is at "); fputs_styled (paddress (gdbarch, load_addr), address_style.style (), gdb_stdout); gdb_printf (" in a file compiled without debugging"); section = msymbol.minsym->obj_section (objfile); if (section_is_overlay (section)) { load_addr = overlay_unmapped_address (load_addr, section); gdb_printf (",\n -- loaded at "); fputs_styled (paddress (gdbarch, load_addr), address_style.style (), gdb_stdout); gdb_printf (" in overlay section %s", section->the_bfd_section->name); } gdb_printf (".\n"); } else error (_("No symbol \"%s\" in current context."), exp); return; } gdb_printf ("Symbol \""); gdb_puts (sym->print_name ()); gdb_printf ("\" is "); val = sym->value_longest (); if (sym->is_objfile_owned ()) section = sym->obj_section (sym->objfile ()); else section = NULL; gdbarch = sym->arch (); if (const symbol_computed_ops *computed_ops = sym->computed_ops (); computed_ops != nullptr) { computed_ops->describe_location (sym, context_pc, gdb_stdout); gdb_printf (".\n"); return; } switch (sym->aclass ()) { case LOC_CONST: case LOC_CONST_BYTES: gdb_printf ("constant"); break; case LOC_LABEL: gdb_printf ("a label at address "); load_addr = sym->value_address (); fputs_styled (paddress (gdbarch, load_addr), address_style.style (), gdb_stdout); if (section_is_overlay (section)) { load_addr = overlay_unmapped_address (load_addr, section); gdb_printf (",\n -- loaded at "); fputs_styled (paddress (gdbarch, load_addr), address_style.style (), gdb_stdout); gdb_printf (" in overlay section %s", section->the_bfd_section->name); } break; case LOC_COMPUTED: gdb_assert_not_reached ("LOC_COMPUTED variable missing a method"); case LOC_REGISTER: /* GDBARCH is the architecture associated with the objfile the symbol is defined in; the target architecture may be different, and may provide additional registers. However, we do not know the target architecture at this point. We assume the objfile architecture will contain all the standard registers that occur in debug info in that objfile. */ regno = sym->register_ops ()->register_number (sym, gdbarch); if (sym->is_argument ()) gdb_printf (_("an argument in register %s"), gdbarch_register_name (gdbarch, regno)); else gdb_printf (_("a variable in register %s"), gdbarch_register_name (gdbarch, regno)); break; case LOC_STATIC: gdb_printf (_("static storage at address ")); load_addr = sym->value_address (); fputs_styled (paddress (gdbarch, load_addr), address_style.style (), gdb_stdout); if (section_is_overlay (section)) { load_addr = overlay_unmapped_address (load_addr, section); gdb_printf (_(",\n -- loaded at ")); fputs_styled (paddress (gdbarch, load_addr), address_style.style (), gdb_stdout); gdb_printf (_(" in overlay section %s"), section->the_bfd_section->name); } break; case LOC_REGPARM_ADDR: /* Note comment at LOC_REGISTER. */ regno = sym->register_ops ()->register_number (sym, gdbarch); gdb_printf (_("address of an argument in register %s"), gdbarch_register_name (gdbarch, regno)); break; case LOC_ARG: gdb_printf (_("an argument at offset %ld"), val); break; case LOC_LOCAL: gdb_printf (_("a local variable at frame offset %ld"), val); break; case LOC_REF_ARG: gdb_printf (_("a reference argument at offset %ld"), val); break; case LOC_TYPEDEF: gdb_printf (_("a typedef")); break; case LOC_BLOCK: gdb_printf (_("a function at address ")); load_addr = sym->value_block ()->entry_pc (); fputs_styled (paddress (gdbarch, load_addr), address_style.style (), gdb_stdout); if (section_is_overlay (section)) { load_addr = overlay_unmapped_address (load_addr, section); gdb_printf (_(",\n -- loaded at ")); fputs_styled (paddress (gdbarch, load_addr), address_style.style (), gdb_stdout); gdb_printf (_(" in overlay section %s"), section->the_bfd_section->name); } break; case LOC_UNRESOLVED: { struct bound_minimal_symbol msym; msym = lookup_bound_minimal_symbol (sym->linkage_name ()); if (msym.minsym == NULL) gdb_printf ("unresolved"); else { section = msym.obj_section (); if (section && (section->the_bfd_section->flags & SEC_THREAD_LOCAL) != 0) { load_addr = CORE_ADDR (msym.minsym->unrelocated_address ()); gdb_printf (_("a thread-local variable at offset %s " "in the thread-local storage for `%s'"), paddress (gdbarch, load_addr), objfile_name (section->objfile)); } else { load_addr = msym.value_address (); gdb_printf (_("static storage at address ")); fputs_styled (paddress (gdbarch, load_addr), address_style.style (), gdb_stdout); if (section_is_overlay (section)) { load_addr = overlay_unmapped_address (load_addr, section); gdb_printf (_(",\n -- loaded at ")); fputs_styled (paddress (gdbarch, load_addr), address_style.style (), gdb_stdout); gdb_printf (_(" in overlay section %s"), section->the_bfd_section->name); } } } } break; case LOC_OPTIMIZED_OUT: gdb_printf (_("optimized out")); break; default: gdb_printf (_("of unknown (botched) type")); break; } gdb_printf (".\n"); } static void x_command (const char *exp, int from_tty) { struct format_data fmt; struct value *val; fmt.format = last_format ? last_format : 'x'; fmt.print_tags = last_print_tags; fmt.size = last_size; fmt.count = 1; fmt.raw = 0; /* If there is no expression and no format, use the most recent count. */ if (exp == nullptr && last_count > 0) fmt.count = last_count; if (exp && *exp == '/') { const char *tmp = exp + 1; fmt = decode_format (&tmp, last_format, last_size); exp = (char *) tmp; } last_count = fmt.count; /* If we have an expression, evaluate it and use it as the address. */ if (exp != 0 && *exp != 0) { expression_up expr = parse_expression (exp); /* Cause expression not to be there any more if this command is repeated with Newline. But don't clobber a user-defined command's definition. */ if (from_tty) set_repeat_arguments (""); val = expr->evaluate (); if (TYPE_IS_REFERENCE (val->type ())) val = coerce_ref (val); /* In rvalue contexts, such as this, functions are coerced into pointers to functions. This makes "x/i main" work. */ if (val->type ()->code () == TYPE_CODE_FUNC && val->lval () == lval_memory) next_address = val->address (); else next_address = value_as_address (val); next_gdbarch = expr->gdbarch; } if (!next_gdbarch) error_no_arg (_("starting display address")); do_examine (fmt, next_gdbarch, next_address); /* If the examine succeeds, we remember its size and format for next time. Set last_size to 'b' for strings. */ if (fmt.format == 's') last_size = 'b'; else last_size = fmt.size; last_format = fmt.format; /* Remember tag-printing setting. */ last_print_tags = fmt.print_tags; /* Set a couple of internal variables if appropriate. */ if (last_examine_value != nullptr) { /* Make last address examined available to the user as $_. Use the correct pointer type. */ struct type *pointer_type = lookup_pointer_type (last_examine_value->type ()); set_internalvar (lookup_internalvar ("_"), value_from_pointer (pointer_type, last_examine_address)); /* Make contents of last address examined available to the user as $__. If the last value has not been fetched from memory then don't fetch it now; instead mark it by voiding the $__ variable. */ if (last_examine_value->lazy ()) clear_internalvar (lookup_internalvar ("__")); else set_internalvar (lookup_internalvar ("__"), last_examine_value.get ()); } } /* Command completion for the 'display' and 'x' commands. */ static void display_and_x_command_completer (struct cmd_list_element *ignore, completion_tracker &tracker, const char *text, const char * /*word*/) { if (skip_over_slash_fmt (tracker, &text)) return; const char *word = advance_to_expression_complete_word_point (tracker, text); expression_completer (ignore, tracker, text, word); } /* Add an expression to the auto-display chain. Specify the expression. */ static void display_command (const char *arg, int from_tty) { struct format_data fmt; struct display *newobj; const char *exp = arg; if (exp == 0) { do_displays (); return; } if (*exp == '/') { exp++; fmt = decode_format (&exp, 0, 0); if (fmt.size && fmt.format == 0) fmt.format = 'x'; if (fmt.format == 'i' || fmt.format == 's') fmt.size = 'b'; } else { fmt.format = 0; fmt.size = 0; fmt.count = 0; fmt.raw = 0; } innermost_block_tracker tracker; expression_up expr = parse_expression (exp, &tracker); newobj = new display (exp, std::move (expr), fmt, current_program_space, tracker.block ()); all_displays.emplace_back (newobj); if (from_tty) do_one_display (newobj); dont_repeat (); } /* Clear out the display_chain. Done when new symtabs are loaded, since this invalidates the types stored in many expressions. */ void clear_displays () { all_displays.clear (); } /* Delete the auto-display DISPLAY. */ static void delete_display (struct display *display) { gdb_assert (display != NULL); auto iter = std::find_if (all_displays.begin (), all_displays.end (), [=] (const std::unique_ptr<struct display> &item) { return item.get () == display; }); gdb_assert (iter != all_displays.end ()); all_displays.erase (iter); } /* Call FUNCTION on each of the displays whose numbers are given in ARGS. DATA is passed unmodified to FUNCTION. */ static void map_display_numbers (const char *args, gdb::function_view<void (struct display *)> function) { int num; if (args == NULL) error_no_arg (_("one or more display numbers")); number_or_range_parser parser (args); while (!parser.finished ()) { const char *p = parser.cur_tok (); num = parser.get_number (); if (num == 0) warning (_("bad display number at or near '%s'"), p); else { auto iter = std::find_if (all_displays.begin (), all_displays.end (), [=] (const std::unique_ptr<display> &item) { return item->number == num; }); if (iter == all_displays.end ()) gdb_printf (_("No display number %d.\n"), num); else function (iter->get ()); } } } /* "undisplay" command. */ static void undisplay_command (const char *args, int from_tty) { if (args == NULL) { if (query (_("Delete all auto-display expressions? "))) clear_displays (); dont_repeat (); return; } map_display_numbers (args, delete_display); dont_repeat (); } /* Display a single auto-display. Do nothing if the display cannot be printed in the current context, or if the display is disabled. */ static void do_one_display (struct display *d) { int within_current_scope; if (!d->enabled_p) return; /* The expression carries the architecture that was used at parse time. This is a problem if the expression depends on architecture features (e.g. register numbers), and the current architecture is now different. For example, a display statement like "display/i $pc" is expected to display the PC register of the current architecture, not the arch at the time the display command was given. Therefore, we re-parse the expression if the current architecture has changed. */ if (d->exp != NULL && d->exp->gdbarch != get_current_arch ()) { d->exp.reset (); d->block = NULL; } if (d->exp == NULL) { try { innermost_block_tracker tracker; d->exp = parse_expression (d->exp_string.c_str (), &tracker); d->block = tracker.block (); } catch (const gdb_exception_error &ex) { /* Can't re-parse the expression. Disable this display item. */ d->enabled_p = false; warning (_("Unable to display \"%s\": %s"), d->exp_string.c_str (), ex.what ()); return; } } if (d->block) { if (d->pspace == current_program_space) within_current_scope = d->block->contains (get_selected_block (0), true); else within_current_scope = 0; } else within_current_scope = 1; if (!within_current_scope) return; scoped_restore save_display_number = make_scoped_restore (&current_display_number, d->number); annotate_display_begin (); gdb_printf ("%d", d->number); annotate_display_number_end (); gdb_printf (": "); if (d->format.size) { annotate_display_format (); gdb_printf ("x/"); if (d->format.count != 1) gdb_printf ("%d", d->format.count); gdb_printf ("%c", d->format.format); if (d->format.format != 'i' && d->format.format != 's') gdb_printf ("%c", d->format.size); gdb_printf (" "); annotate_display_expression (); gdb_puts (d->exp_string.c_str ()); annotate_display_expression_end (); if (d->format.count != 1 || d->format.format == 'i') gdb_printf ("\n"); else gdb_printf (" "); annotate_display_value (); try { struct value *val; CORE_ADDR addr; val = d->exp->evaluate (); addr = value_as_address (val); if (d->format.format == 'i') addr = gdbarch_addr_bits_remove (d->exp->gdbarch, addr); do_examine (d->format, d->exp->gdbarch, addr); } catch (const gdb_exception_error &ex) { gdb_printf (_("%p[<error: %s>%p]\n"), metadata_style.style ().ptr (), ex.what (), nullptr); } } else { struct value_print_options opts; annotate_display_format (); if (d->format.format) gdb_printf ("/%c ", d->format.format); annotate_display_expression (); gdb_puts (d->exp_string.c_str ()); annotate_display_expression_end (); gdb_printf (" = "); annotate_display_expression (); get_formatted_print_options (&opts, d->format.format); opts.raw = d->format.raw; try { struct value *val; val = d->exp->evaluate (); print_formatted (val, d->format.size, &opts, gdb_stdout); } catch (const gdb_exception_error &ex) { fprintf_styled (gdb_stdout, metadata_style.style (), _("<error: %s>"), ex.what ()); } gdb_printf ("\n"); } annotate_display_end (); gdb_flush (gdb_stdout); } /* Display all of the values on the auto-display chain which can be evaluated in the current scope. */ void do_displays (void) { for (auto &d : all_displays) do_one_display (d.get ()); } /* Delete the auto-display which we were in the process of displaying. This is done when there is an error or a signal. */ void disable_display (int num) { for (auto &d : all_displays) if (d->number == num) { d->enabled_p = false; return; } gdb_printf (_("No display number %d.\n"), num); } void disable_current_display (void) { if (current_display_number >= 0) { disable_display (current_display_number); gdb_printf (gdb_stderr, _("Disabling display %d to " "avoid infinite recursion.\n"), current_display_number); } current_display_number = -1; } static void info_display_command (const char *ignore, int from_tty) { if (all_displays.empty ()) gdb_printf (_("There are no auto-display expressions now.\n")); else gdb_printf (_("Auto-display expressions now in effect:\n\ Num Enb Expression\n")); for (auto &d : all_displays) { gdb_printf ("%d: %c ", d->number, "ny"[(int) d->enabled_p]); if (d->format.size) gdb_printf ("/%d%c%c ", d->format.count, d->format.size, d->format.format); else if (d->format.format) gdb_printf ("/%c ", d->format.format); gdb_puts (d->exp_string.c_str ()); if (d->block && !d->block->contains (get_selected_block (0), true)) gdb_printf (_(" (cannot be evaluated in the current context)")); gdb_printf ("\n"); } } /* Implementation of both the "disable display" and "enable display" commands. ENABLE decides what to do. */ static void enable_disable_display_command (const char *args, int from_tty, bool enable) { if (args == NULL) { for (auto &d : all_displays) d->enabled_p = enable; return; } map_display_numbers (args, [=] (struct display *d) { d->enabled_p = enable; }); } /* The "enable display" command. */ static void enable_display_command (const char *args, int from_tty) { enable_disable_display_command (args, from_tty, true); } /* The "disable display" command. */ static void disable_display_command (const char *args, int from_tty) { enable_disable_display_command (args, from_tty, false); } /* display_chain items point to blocks and expressions. Some expressions in turn may point to symbols. Both symbols and blocks are obstack_alloc'd on objfile_stack, and are obstack_free'd when a shared library is unloaded. Clear pointers that are about to become dangling. Both .exp and .block fields will be restored next time we need to display an item by re-parsing .exp_string field in the new execution context. */ static void clear_dangling_display_expressions (struct objfile *objfile) { program_space *pspace = objfile->pspace; if (objfile->separate_debug_objfile_backlink) { objfile = objfile->separate_debug_objfile_backlink; gdb_assert (objfile->pspace == pspace); } for (auto &d : all_displays) { if (d->pspace != pspace) continue; struct objfile *bl_objf = nullptr; if (d->block != nullptr) { bl_objf = d->block->objfile (); if (bl_objf->separate_debug_objfile_backlink != nullptr) bl_objf = bl_objf->separate_debug_objfile_backlink; } if (bl_objf == objfile || (d->exp != nullptr && d->exp->uses_objfile (objfile))) { d->exp.reset (); d->block = NULL; } } } /* Print the value in stack frame FRAME of a variable specified by a struct symbol. NAME is the name to print; if NULL then VAR's print name will be used. STREAM is the ui_file on which to print the value. INDENT specifies the number of indent levels to print before printing the variable name. */ void print_variable_and_value (const char *name, struct symbol *var, const frame_info_ptr &frame, struct ui_file *stream, int indent) { if (!name) name = var->print_name (); gdb_printf (stream, "%*s%ps = ", 2 * indent, "", styled_string (variable_name_style.style (), name)); try { struct value *val; struct value_print_options opts; /* READ_VAR_VALUE needs a block in order to deal with non-local references (i.e. to handle nested functions). In this context, we print variables that are local to this frame, so we can avoid passing a block to it. */ val = read_var_value (var, NULL, frame); get_user_print_options (&opts); opts.deref_ref = true; common_val_print_checked (val, stream, indent, &opts, current_language); } catch (const gdb_exception_error &except) { fprintf_styled (stream, metadata_style.style (), "<error reading variable %s (%s)>", name, except.what ()); } gdb_printf (stream, "\n"); } /* Subroutine of ui_printf to simplify it. Print VALUE to STREAM using FORMAT. VALUE is a C-style string either on the target or in a GDB internal variable. */ static void printf_c_string (struct ui_file *stream, const char *format, struct value *value) { gdb::byte_vector str; if (((value->type ()->code () != TYPE_CODE_PTR && value->lval () == lval_internalvar) || value->type ()->code () == TYPE_CODE_ARRAY) && c_is_string_type_p (value->type ())) { size_t len = value->type ()->length (); /* Copy the internal var value to TEM_STR and append a terminating null character. This protects against corrupted C-style strings that lack the terminating null char. It also allows Ada-style strings (not null terminated) to be printed without problems. */ str.resize (len + 1); memcpy (str.data (), value->contents ().data (), len); str [len] = 0; } else { CORE_ADDR tem = value_as_address (value);; if (tem == 0) { DIAGNOSTIC_PUSH DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL gdb_printf (stream, format, "(null)"); DIAGNOSTIC_POP return; } /* This is a %s argument. Build the string in STR which is currently empty. */ gdb_assert (str.size () == 0); size_t len; for (len = 0;; len++) { gdb_byte c; QUIT; read_memory (tem + len, &c, 1); if (!exceeds_max_value_size (len + 1)) str.push_back (c); if (c == 0) break; } if (exceeds_max_value_size (len + 1)) error (_("printed string requires %s bytes, which is more than " "max-value-size"), plongest (len + 1)); /* We will have passed through the above loop at least once, and will only exit the loop when we have pushed a zero byte onto the end of STR. */ gdb_assert (str.size () > 0); gdb_assert (str.back () == 0); } DIAGNOSTIC_PUSH DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL gdb_printf (stream, format, (char *) str.data ()); DIAGNOSTIC_POP } /* Subroutine of ui_printf to simplify it. Print VALUE to STREAM using FORMAT. VALUE is a wide C-style string on the target or in a GDB internal variable. */ static void printf_wide_c_string (struct ui_file *stream, const char *format, struct value *value) { const gdb_byte *str; size_t len; struct gdbarch *gdbarch = value->type ()->arch (); struct type *wctype = lookup_typename (current_language, "wchar_t", NULL, 0); int wcwidth = wctype->length (); std::optional<gdb::byte_vector> tem_str; if (value->lval () == lval_internalvar && c_is_string_type_p (value->type ())) { str = value->contents ().data (); len = value->type ()->length (); } else { CORE_ADDR tem = value_as_address (value); if (tem == 0) { DIAGNOSTIC_PUSH DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL gdb_printf (stream, format, "(null)"); DIAGNOSTIC_POP return; } /* This is a %s argument. Find the length of the string. */ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); tem_str.emplace (); for (len = 0;; len += wcwidth) { QUIT; gdb_byte *dst; if (!exceeds_max_value_size (len + wcwidth)) { tem_str->resize (tem_str->size () + wcwidth); dst = tem_str->data () + len; } else { /* We still need to check for the null-character, so we need somewhere to place the data read from the inferior. We can't keep growing TEM_STR, it's gotten too big, so instead just read the new character into the start of TEMS_STR. This will corrupt the previously read contents, but we're not going to print this string anyway, we just want to know how big it would have been so we can tell the user in the error message (see below). And we know there will be space in this buffer so long as WCWIDTH is smaller than our LONGEST type, the max-value-size can't be smaller than a LONGEST. */ dst = tem_str->data (); } read_memory (tem + len, dst, wcwidth); if (extract_unsigned_integer (dst, wcwidth, byte_order) == 0) break; } if (exceeds_max_value_size (len + wcwidth)) error (_("printed string requires %s bytes, which is more than " "max-value-size"), plongest (len + wcwidth)); str = tem_str->data (); } auto_obstack output; convert_between_encodings (target_wide_charset (gdbarch), host_charset (), str, len, wcwidth, &output, translit_char); obstack_grow_str0 (&output, ""); DIAGNOSTIC_PUSH DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL gdb_printf (stream, format, obstack_base (&output)); DIAGNOSTIC_POP } /* Subroutine of ui_printf to simplify it. Print VALUE, a floating point value, to STREAM using FORMAT. */ static void printf_floating (struct ui_file *stream, const char *format, struct value *value, enum argclass argclass) { /* Parameter data. */ struct type *param_type = value->type (); struct gdbarch *gdbarch = param_type->arch (); /* Determine target type corresponding to the format string. */ struct type *fmt_type; switch (argclass) { case double_arg: fmt_type = builtin_type (gdbarch)->builtin_double; break; case long_double_arg: fmt_type = builtin_type (gdbarch)->builtin_long_double; break; case dec32float_arg: fmt_type = builtin_type (gdbarch)->builtin_decfloat; break; case dec64float_arg: fmt_type = builtin_type (gdbarch)->builtin_decdouble; break; case dec128float_arg: fmt_type = builtin_type (gdbarch)->builtin_declong; break; default: gdb_assert_not_reached ("unexpected argument class"); } /* To match the traditional GDB behavior, the conversion is done differently depending on the type of the parameter: - if the parameter has floating-point type, it's value is converted to the target type; - otherwise, if the parameter has a type that is of the same size as a built-in floating-point type, the value bytes are interpreted as if they were of that type, and then converted to the target type (this is not done for decimal floating-point argument classes); - otherwise, if the source value has an integer value, it's value is converted to the target type; - otherwise, an error is raised. In either case, the result of the conversion is a byte buffer formatted in the target format for the target type. */ if (fmt_type->code () == TYPE_CODE_FLT) { param_type = float_type_from_length (param_type); if (param_type != value->type ()) value = value_from_contents (param_type, value->contents ().data ()); } value = value_cast (fmt_type, value); /* Convert the value to a string and print it. */ std::string str = target_float_to_string (value->contents ().data (), fmt_type, format); gdb_puts (str.c_str (), stream); } /* Subroutine of ui_printf to simplify it. Print VALUE, a target pointer, to STREAM using FORMAT. */ static void printf_pointer (struct ui_file *stream, const char *format, struct value *value) { /* We avoid the host's %p because pointers are too likely to be the wrong size. The only interesting modifier for %p is a width; extract that, and then handle %p as glibc would: %#x or a literal "(nil)". */ #ifdef PRINTF_HAS_LONG_LONG long long val = value_as_long (value); #else long val = value_as_long (value); #endif /* Build the new output format in FMT. */ std::string fmt; /* Copy up to the leading %. */ const char *p = format; while (*p) { int is_percent = (*p == '%'); fmt.push_back (*p++); if (is_percent) { if (*p == '%') fmt.push_back (*p++); else break; } } if (val != 0) fmt.push_back ('#'); /* Copy any width or flags. Only the "-" flag is valid for pointers -- see the format_pieces constructor. */ while (*p == '-' || (*p >= '0' && *p < '9')) fmt.push_back (*p++); gdb_assert (*p == 'p' && *(p + 1) == '\0'); if (val != 0) { #ifdef PRINTF_HAS_LONG_LONG fmt.push_back ('l'); #endif fmt.push_back ('l'); fmt.push_back ('x'); DIAGNOSTIC_PUSH DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL gdb_printf (stream, fmt.c_str (), val); DIAGNOSTIC_POP } else { fmt.push_back ('s'); DIAGNOSTIC_PUSH DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL gdb_printf (stream, fmt.c_str (), "(nil)"); DIAGNOSTIC_POP } } /* printf "printf format string" ARG to STREAM. */ static void ui_printf (const char *arg, struct ui_file *stream) { const char *s = arg; std::vector<struct value *> val_args; if (s == 0) error_no_arg (_("format-control string and values to print")); s = skip_spaces (s); /* A format string should follow, enveloped in double quotes. */ if (*s++ != '"') error (_("Bad format string, missing '\"'.")); format_pieces fpieces (&s, false, true); if (*s++ != '"') error (_("Bad format string, non-terminated '\"'.")); s = skip_spaces (s); if (*s != ',' && *s != 0) error (_("Invalid argument syntax")); if (*s == ',') s++; s = skip_spaces (s); { int nargs_wanted; int i; const char *current_substring; nargs_wanted = 0; for (auto &&piece : fpieces) if (piece.argclass != literal_piece) ++nargs_wanted; /* Now, parse all arguments and evaluate them. Store the VALUEs in VAL_ARGS. */ while (*s != '\0') { const char *s1; s1 = s; val_args.push_back (parse_to_comma_and_eval (&s1)); s = s1; if (*s == ',') s++; } if (val_args.size () != nargs_wanted) error (_("Wrong number of arguments for specified format-string")); /* Now actually print them. */ i = 0; for (auto &&piece : fpieces) { current_substring = piece.string; switch (piece.argclass) { case string_arg: printf_c_string (stream, current_substring, val_args[i]); break; case wide_string_arg: printf_wide_c_string (stream, current_substring, val_args[i]); break; case wide_char_arg: { struct gdbarch *gdbarch = val_args[i]->type ()->arch (); struct type *wctype = lookup_typename (current_language, "wchar_t", NULL, 0); struct type *valtype; const gdb_byte *bytes; valtype = val_args[i]->type (); if (valtype->length () != wctype->length () || valtype->code () != TYPE_CODE_INT) error (_("expected wchar_t argument for %%lc")); bytes = val_args[i]->contents ().data (); auto_obstack output; convert_between_encodings (target_wide_charset (gdbarch), host_charset (), bytes, valtype->length (), valtype->length (), &output, translit_char); obstack_grow_str0 (&output, ""); DIAGNOSTIC_PUSH DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL gdb_printf (stream, current_substring, obstack_base (&output)); DIAGNOSTIC_POP } break; case long_long_arg: #ifdef PRINTF_HAS_LONG_LONG { long long val = value_as_long (val_args[i]); DIAGNOSTIC_PUSH DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL gdb_printf (stream, current_substring, val); DIAGNOSTIC_POP break; } #else error (_("long long not supported in printf")); #endif case int_arg: { int val = value_as_long (val_args[i]); DIAGNOSTIC_PUSH DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL gdb_printf (stream, current_substring, val); DIAGNOSTIC_POP break; } case long_arg: { long val = value_as_long (val_args[i]); DIAGNOSTIC_PUSH DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL gdb_printf (stream, current_substring, val); DIAGNOSTIC_POP break; } case size_t_arg: { size_t val = value_as_long (val_args[i]); DIAGNOSTIC_PUSH DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL gdb_printf (stream, current_substring, val); DIAGNOSTIC_POP break; } /* Handles floating-point values. */ case double_arg: case long_double_arg: case dec32float_arg: case dec64float_arg: case dec128float_arg: printf_floating (stream, current_substring, val_args[i], piece.argclass); break; case ptr_arg: printf_pointer (stream, current_substring, val_args[i]); break; case value_arg: { value_print_options print_opts; get_user_print_options (&print_opts); if (current_substring[2] == '[') { std::string args (&current_substring[3], strlen (&current_substring[3]) - 1); const char *args_ptr = args.c_str (); /* Override global settings with explicit options, if any. */ auto group = make_value_print_options_def_group (&print_opts); gdb::option::process_options (&args_ptr, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_ERROR, group); if (*args_ptr != '\0') error (_("unexpected content in print options: %s"), args_ptr); } print_formatted (val_args[i], 0, &print_opts, stream); } break; case literal_piece: /* Print a portion of the format string that has no directives. Note that this will not include any ordinary %-specs, but it might include "%%". That is why we use gdb_printf and not gdb_puts here. Also, we pass a dummy argument because some platforms have modified GCC to include -Wformat-security by default, which will warn here if there is no argument. */ DIAGNOSTIC_PUSH DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL gdb_printf (stream, current_substring, 0); DIAGNOSTIC_POP break; default: internal_error (_("failed internal consistency check")); } /* Maybe advance to the next argument. */ if (piece.argclass != literal_piece) ++i; } } } /* Implement the "printf" command. */ static void printf_command (const char *arg, int from_tty) { ui_printf (arg, gdb_stdout); gdb_stdout->reset_style (); gdb_stdout->wrap_here (0); gdb_stdout->flush (); } /* Implement the "eval" command. */ static void eval_command (const char *arg, int from_tty) { string_file stb; ui_printf (arg, &stb); std::string expanded = insert_user_defined_cmd_args (stb.c_str ()); execute_command (expanded.c_str (), from_tty); } /* Convenience function for error checking in memory-tag commands. */ static void show_addr_not_tagged (CORE_ADDR address) { error (_("Address %s not in a region mapped with a memory tagging flag."), paddress (current_inferior ()->arch (), address)); } /* Convenience function for error checking in memory-tag commands. */ static void show_memory_tagging_unsupported (void) { error (_("Memory tagging not supported or disabled by the current" " architecture.")); } /* Implement the "memory-tag" prefix command. */ static void memory_tag_command (const char *arg, int from_tty) { help_list (memory_tag_list, "memory-tag ", all_commands, gdb_stdout); } /* Helper for print-logical-tag and print-allocation-tag. */ static void memory_tag_print_tag_command (const char *args, enum memtag_type tag_type) { if (args == nullptr) error_no_arg (_("address or pointer")); /* Parse args into a value. If the value is a pointer or an address, then fetch the logical or allocation tag. */ value_print_options print_opts; struct value *val = process_print_command_args (args, &print_opts, true); gdbarch *arch = current_inferior ()->arch (); /* If the address is not in a region memory mapped with a memory tagging flag, it is no use trying to access/manipulate its allocation tag. It is OK to manipulate the logical tag though. */ if (tag_type == memtag_type::allocation && !gdbarch_tagged_address_p (arch, val)) show_addr_not_tagged (value_as_address (val)); value *tag_value = gdbarch_get_memtag (arch, val, tag_type); std::string tag = gdbarch_memtag_to_string (arch, tag_value); if (tag.empty ()) gdb_printf (_("%s tag unavailable.\n"), tag_type == memtag_type::logical? "Logical" : "Allocation"); struct value *v_tag = process_print_command_args (tag.c_str (), &print_opts, true); print_opts.output_format = 'x'; print_value (v_tag, print_opts); } /* Implement the "memory-tag print-logical-tag" command. */ static void memory_tag_print_logical_tag_command (const char *args, int from_tty) { if (!target_supports_memory_tagging ()) show_memory_tagging_unsupported (); memory_tag_print_tag_command (args, memtag_type::logical); } /* Implement the "memory-tag print-allocation-tag" command. */ static void memory_tag_print_allocation_tag_command (const char *args, int from_tty) { if (!target_supports_memory_tagging ()) show_memory_tagging_unsupported (); memory_tag_print_tag_command (args, memtag_type::allocation); } /* Parse ARGS and extract ADDR and TAG. ARGS should have format <expression> <tag bytes>. */ static void parse_with_logical_tag_input (const char *args, struct value **val, gdb::byte_vector &tags, value_print_options *print_opts) { /* Fetch the address. */ std::string address_string = extract_string_maybe_quoted (&args); /* Parse the address into a value. */ *val = process_print_command_args (address_string.c_str (), print_opts, true); /* Fetch the tag bytes. */ std::string tag_string = extract_string_maybe_quoted (&args); /* Validate the input. */ if (address_string.empty () || tag_string.empty ()) error (_("Missing arguments.")); if (tag_string.length () != 2) error (_("Error parsing tags argument. The tag should be 2 digits.")); tags = hex2bin (tag_string.c_str ()); } /* Implement the "memory-tag with-logical-tag" command. */ static void memory_tag_with_logical_tag_command (const char *args, int from_tty) { if (!target_supports_memory_tagging ()) show_memory_tagging_unsupported (); if (args == nullptr) error_no_arg (_("<address> <tag>")); gdb::byte_vector tags; struct value *val; value_print_options print_opts; gdbarch *arch = current_inferior ()->arch (); /* Parse the input. */ parse_with_logical_tag_input (args, &val, tags, &print_opts); /* Setting the logical tag is just a local operation that does not touch any memory from the target. Given an input value, we modify the value to include the appropriate tag. For this reason we need to cast the argument value to a (void *) pointer. This is so we have the right type for the gdbarch hook to manipulate the value and insert the tag. Otherwise, this would fail if, for example, GDB parsed the argument value into an int-sized value and the pointer value has a type of greater length. */ /* Cast to (void *). */ val = value_cast (builtin_type (current_inferior ()->arch ())->builtin_data_ptr, val); /* Length doesn't matter for a logical tag. Pass 0. */ if (!gdbarch_set_memtags (arch, val, 0, tags, memtag_type::logical)) gdb_printf (_("Could not update the logical tag data.\n")); else { /* Always print it in hex format. */ print_opts.output_format = 'x'; print_value (val, print_opts); } } /* Parse ARGS and extract ADDR, LENGTH and TAGS. */ static void parse_set_allocation_tag_input (const char *args, struct value **val, size_t *length, gdb::byte_vector &tags) { /* Fetch the address. */ std::string address_string = extract_string_maybe_quoted (&args); /* Parse the address into a value. */ value_print_options print_opts; *val = process_print_command_args (address_string.c_str (), &print_opts, true); /* Fetch the length. */ std::string length_string = extract_string_maybe_quoted (&args); /* Fetch the tag bytes. */ std::string tags_string = extract_string_maybe_quoted (&args); /* Validate the input. */ if (address_string.empty () || length_string.empty () || tags_string.empty ()) error (_("Missing arguments.")); errno = 0; const char *trailer = nullptr; LONGEST parsed_length = strtoulst (length_string.c_str (), &trailer, 10); if (errno != 0 || (trailer != nullptr && trailer[0] != '\0')) error (_("Error parsing length argument.")); if (parsed_length <= 0) error (_("Invalid zero or negative length.")); *length = parsed_length; if (tags_string.length () % 2) error (_("Error parsing tags argument. Tags should be 2 digits per byte.")); tags = hex2bin (tags_string.c_str ()); /* If the address is not in a region memory mapped with a memory tagging flag, it is no use trying to access/manipulate its allocation tag. */ if (!gdbarch_tagged_address_p (current_inferior ()->arch (), *val)) show_addr_not_tagged (value_as_address (*val)); } /* Implement the "memory-tag set-allocation-tag" command. ARGS should be in the format <address> <length> <tags>. */ static void memory_tag_set_allocation_tag_command (const char *args, int from_tty) { if (!target_supports_memory_tagging ()) show_memory_tagging_unsupported (); if (args == nullptr) error_no_arg (_("<starting address> <length> <tag bytes>")); gdb::byte_vector tags; size_t length = 0; struct value *val; /* Parse the input. */ parse_set_allocation_tag_input (args, &val, &length, tags); if (!gdbarch_set_memtags (current_inferior ()->arch (), val, length, tags, memtag_type::allocation)) gdb_printf (_("Could not update the allocation tag(s).\n")); else gdb_printf (_("Allocation tag(s) updated successfully.\n")); } /* Implement the "memory-tag check" command. */ static void memory_tag_check_command (const char *args, int from_tty) { if (!target_supports_memory_tagging ()) show_memory_tagging_unsupported (); if (args == nullptr) error_no_arg (_("address or pointer")); /* Parse the expression into a value. If the value is an address or pointer, then check its logical tag against the allocation tag. */ value_print_options print_opts; struct value *val = process_print_command_args (args, &print_opts, true); gdbarch *arch = current_inferior ()->arch (); /* If the address is not in a region memory mapped with a memory tagging flag, it is no use trying to access/manipulate its allocation tag. */ if (!gdbarch_tagged_address_p (arch, val)) show_addr_not_tagged (value_as_address (val)); CORE_ADDR addr = value_as_address (val); /* Check if the tag is valid. */ if (!gdbarch_memtag_matches_p (arch, val)) { value *tag = gdbarch_get_memtag (arch, val, memtag_type::logical); std::string ltag = gdbarch_memtag_to_string (arch, tag); tag = gdbarch_get_memtag (arch, val, memtag_type::allocation); std::string atag = gdbarch_memtag_to_string (arch, tag); gdb_printf (_("Logical tag (%s) does not match" " the allocation tag (%s) for address %s.\n"), ltag.c_str (), atag.c_str (), paddress (current_inferior ()->arch (), addr)); } else { struct value *tag = gdbarch_get_memtag (current_inferior ()->arch (), val, memtag_type::logical); std::string ltag = gdbarch_memtag_to_string (current_inferior ()->arch (), tag); gdb_printf (_("Memory tags for address %s match (%s).\n"), paddress (current_inferior ()->arch (), addr), ltag.c_str ()); } } void _initialize_printcmd (); void _initialize_printcmd () { struct cmd_list_element *c; current_display_number = -1; gdb::observers::free_objfile.attach (clear_dangling_display_expressions, "printcmd"); add_info ("address", info_address_command, _("Describe where symbol SYM is stored.\n\ Usage: info address SYM")); add_info ("symbol", info_symbol_command, _("\ Describe what symbol is at location ADDR.\n\ Usage: info symbol ADDR\n\ Only for symbols with fixed locations (global or static scope).")); c = add_com ("x", class_vars, x_command, _("\ Examine memory: x/FMT ADDRESS.\n\ ADDRESS is an expression for the memory address to examine.\n\ FMT is a repeat count followed by a format letter and a size letter.\n\ Format letters are o(octal), x(hex), d(decimal), u(unsigned decimal),\n\ t(binary), f(float), a(address), i(instruction), c(char), s(string)\n\ and z(hex, zero padded on the left).\n\ Size letters are b(byte), h(halfword), w(word), g(giant, 8 bytes).\n\ The specified number of objects of the specified size are printed\n\ according to the format. If a negative number is specified, memory is\n\ examined backward from the address.\n\n\ Defaults for format and size letters are those previously used.\n\ Default count is 1. Default address is following last thing printed\n\ with this command or \"print\".")); set_cmd_completer_handle_brkchars (c, display_and_x_command_completer); add_info ("display", info_display_command, _("\ Expressions to display when program stops, with code numbers.\n\ Usage: info display")); add_cmd ("undisplay", class_vars, undisplay_command, _("\ Cancel some expressions to be displayed when program stops.\n\ Usage: undisplay [NUM]...\n\ Arguments are the code numbers of the expressions to stop displaying.\n\ No argument means cancel all automatic-display expressions.\n\ \"delete display\" has the same effect as this command.\n\ Do \"info display\" to see current list of code numbers."), &cmdlist); c = add_com ("display", class_vars, display_command, _("\ Print value of expression EXP each time the program stops.\n\ Usage: display[/FMT] EXP\n\ /FMT may be used before EXP as in the \"print\" command.\n\ /FMT \"i\" or \"s\" or including a size-letter is allowed,\n\ as in the \"x\" command, and then EXP is used to get the address to examine\n\ and examining is done as in the \"x\" command.\n\n\ With no argument, display all currently requested auto-display expressions.\n\ Use \"undisplay\" to cancel display requests previously made.")); set_cmd_completer_handle_brkchars (c, display_and_x_command_completer); add_cmd ("display", class_vars, enable_display_command, _("\ Enable some expressions to be displayed when program stops.\n\ Usage: enable display [NUM]...\n\ Arguments are the code numbers of the expressions to resume displaying.\n\ No argument means enable all automatic-display expressions.\n\ Do \"info display\" to see current list of code numbers."), &enablelist); add_cmd ("display", class_vars, disable_display_command, _("\ Disable some expressions to be displayed when program stops.\n\ Usage: disable display [NUM]...\n\ Arguments are the code numbers of the expressions to stop displaying.\n\ No argument means disable all automatic-display expressions.\n\ Do \"info display\" to see current list of code numbers."), &disablelist); add_cmd ("display", class_vars, undisplay_command, _("\ Cancel some expressions to be displayed when program stops.\n\ Usage: delete display [NUM]...\n\ Arguments are the code numbers of the expressions to stop displaying.\n\ No argument means cancel all automatic-display expressions.\n\ Do \"info display\" to see current list of code numbers."), &deletelist); add_com ("printf", class_vars, printf_command, _("\ Formatted printing, like the C \"printf\" function.\n\ Usage: printf \"format string\", ARG1, ARG2, ARG3, ..., ARGN\n\ This supports most C printf format specifications, like %s, %d, etc.")); add_com ("output", class_vars, output_command, _("\ Like \"print\" but don't put in value history and don't print newline.\n\ Usage: output EXP\n\ This is useful in user-defined commands.")); add_prefix_cmd ("set", class_vars, set_command, _("\ Evaluate expression EXP and assign result to variable VAR.\n\ Usage: set VAR = EXP\n\ This uses assignment syntax appropriate for the current language\n\ (VAR = EXP or VAR := EXP for example).\n\ VAR may be a debugger \"convenience\" variable (names starting\n\ with $), a register (a few standard names starting with $), or an actual\n\ variable in the program being debugged. EXP is any valid expression.\n\ Use \"set variable\" for variables with names identical to set subcommands.\n\ \n\ With a subcommand, this command modifies parts of the gdb environment.\n\ You can see these environment settings with the \"show\" command."), &setlist, 1, &cmdlist); /* "call" is the same as "set", but handy for dbx users to call fns. */ c = add_com ("call", class_vars, call_command, _("\ Call a function in the program.\n\ Usage: call EXP\n\ The argument is the function name and arguments, in the notation of the\n\ current working language. The result is printed and saved in the value\n\ history, if it is not void.")); set_cmd_completer_handle_brkchars (c, print_command_completer); cmd_list_element *set_variable_cmd = add_cmd ("variable", class_vars, set_command, _("\ Evaluate expression EXP and assign result to variable VAR.\n\ Usage: set variable VAR = EXP\n\ This uses assignment syntax appropriate for the current language\n\ (VAR = EXP or VAR := EXP for example).\n\ VAR may be a debugger \"convenience\" variable (names starting\n\ with $), a register (a few standard names starting with $), or an actual\n\ variable in the program being debugged. EXP is any valid expression.\n\ This may usually be abbreviated to simply \"set\"."), &setlist); add_alias_cmd ("var", set_variable_cmd, class_vars, 0, &setlist); const auto print_opts = make_value_print_options_def_group (nullptr); static const std::string print_help = gdb::option::build_help (_("\ Print value of expression EXP.\n\ Usage: print [[OPTION]... --] [/FMT] [EXP]\n\ \n\ Options:\n\ %OPTIONS%\n\ \n\ Note: because this command accepts arbitrary expressions, if you\n\ specify any command option, you must use a double dash (\"--\")\n\ to mark the end of option processing. E.g.: \"print -o -- myobj\".\n\ \n\ Variables accessible are those of the lexical environment of the selected\n\ stack frame, plus all those whose scope is global or an entire file.\n\ \n\ $NUM gets previous value number NUM. $ and $$ are the last two values.\n\ $$NUM refers to NUM'th value back from the last one.\n\ Names starting with $ refer to registers (with the values they would have\n\ if the program were to return to the stack frame now selected, restoring\n\ all registers saved by frames farther in) or else to debugger\n\ \"convenience\" variables (any such name not a known register).\n\ Use assignment expressions to give values to convenience variables.\n\ \n\ {TYPE}ADREXP refers to a datum of data type TYPE, located at address ADREXP.\n\ @ is a binary operator for treating consecutive data objects\n\ anywhere in memory as an array. FOO@NUM gives an array whose first\n\ element is FOO, whose second element is stored in the space following\n\ where FOO is stored, etc. FOO must be an expression whose value\n\ resides in memory.\n\ \n\ EXP may be preceded with /FMT, where FMT is a format letter\n\ but no count or size letter (see \"x\" command)."), print_opts); cmd_list_element *print_cmd = add_com ("print", class_vars, print_command, print_help.c_str ()); set_cmd_completer_handle_brkchars (print_cmd, print_command_completer); add_com_alias ("p", print_cmd, class_vars, 1); add_com_alias ("inspect", print_cmd, class_vars, 1); add_setshow_uinteger_cmd ("max-symbolic-offset", no_class, &max_symbolic_offset, _("\ Set the largest offset that will be printed in <SYMBOL+1234> form."), _("\ Show the largest offset that will be printed in <SYMBOL+1234> form."), _("\ Tell GDB to only display the symbolic form of an address if the\n\ offset between the closest earlier symbol and the address is less than\n\ the specified maximum offset. The default is \"unlimited\", which tells GDB\n\ to always print the symbolic form of an address if any symbol precedes\n\ it. Zero is equivalent to \"unlimited\"."), NULL, show_max_symbolic_offset, &setprintlist, &showprintlist); add_setshow_boolean_cmd ("symbol-filename", no_class, &print_symbol_filename, _("\ Set printing of source filename and line number with <SYMBOL>."), _("\ Show printing of source filename and line number with <SYMBOL>."), NULL, NULL, show_print_symbol_filename, &setprintlist, &showprintlist); add_com ("eval", no_class, eval_command, _("\ Construct a GDB command and then evaluate it.\n\ Usage: eval \"format string\", ARG1, ARG2, ARG3, ..., ARGN\n\ Convert the arguments to a string as \"printf\" would, but then\n\ treat this string as a command line, and evaluate it.")); /* Memory tagging commands. */ add_prefix_cmd ("memory-tag", class_vars, memory_tag_command, _("\ Generic command for printing and manipulating memory tag properties."), &memory_tag_list, 0, &cmdlist); add_cmd ("print-logical-tag", class_vars, memory_tag_print_logical_tag_command, ("Print the logical tag from POINTER.\n\ Usage: memory-tag print-logical-tag <POINTER>.\n\ <POINTER> is an expression that evaluates to a pointer.\n\ Print the logical tag contained in POINTER. The tag interpretation is\n\ architecture-specific."), &memory_tag_list); add_cmd ("print-allocation-tag", class_vars, memory_tag_print_allocation_tag_command, _("Print the allocation tag for ADDRESS.\n\ Usage: memory-tag print-allocation-tag <ADDRESS>.\n\ <ADDRESS> is an expression that evaluates to a memory address.\n\ Print the allocation tag associated with the memory address ADDRESS.\n\ The tag interpretation is architecture-specific."), &memory_tag_list); add_cmd ("with-logical-tag", class_vars, memory_tag_with_logical_tag_command, _("Print a POINTER with a specific logical TAG.\n\ Usage: memory-tag with-logical-tag <POINTER> <TAG>\n\ <POINTER> is an expression that evaluates to a pointer.\n\ <TAG> is a sequence of hex bytes that is interpreted by the architecture\n\ as a single memory tag."), &memory_tag_list); add_cmd ("set-allocation-tag", class_vars, memory_tag_set_allocation_tag_command, _("Set the allocation tag(s) for a memory range.\n\ Usage: memory-tag set-allocation-tag <ADDRESS> <LENGTH> <TAG_BYTES>\n\ <ADDRESS> is an expression that evaluates to a memory address\n\ <LENGTH> is the number of bytes that is added to <ADDRESS> to calculate\n\ the memory range.\n\ <TAG_BYTES> is a sequence of hex bytes that is interpreted by the\n\ architecture as one or more memory tags.\n\ Sets the tags of the memory range [ADDRESS, ADDRESS + LENGTH)\n\ to TAG_BYTES.\n\ \n\ If the number of tags is greater than or equal to the number of tag granules\n\ in the [ADDRESS, ADDRESS + LENGTH) range, only the tags up to the\n\ number of tag granules are updated.\n\ \n\ If the number of tags is less than the number of tag granules, then the\n\ command is a fill operation. The TAG_BYTES are interpreted as a pattern\n\ that gets repeated until the number of tag granules in the memory range\n\ [ADDRESS, ADDRESS + LENGTH) is updated."), &memory_tag_list); add_cmd ("check", class_vars, memory_tag_check_command, _("Validate a pointer's logical tag against the allocation tag.\n\ Usage: memory-tag check <POINTER>\n\ <POINTER> is an expression that evaluates to a pointer\n\ Fetch the logical and allocation tags for POINTER and compare them\n\ for equality. If the tags do not match, print additional information about\n\ the tag mismatch."), &memory_tag_list); }


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