/* Print values for GNU debugger GDB. Copyright (C) 1986-2014 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 "defs.h" #include "frame.h" #include "symtab.h" #include "gdbtypes.h" #include "value.h" #include "language.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" /* for overlay functions */ #include "objfiles.h" /* ditto */ #include "completer.h" /* for completion functions */ #include "ui-out.h" #include "block.h" #include "disasm.h" #include "dfp.h" #include "exceptions.h" #include "observer.h" #include "solist.h" #include "parser-defs.h" #include "charset.h" #include "arch-utils.h" #include "cli/cli-utils.h" #include "format.h" #include "source.h" #ifdef TUI #include "tui/tui.h" /* For tui_active et al. */ #endif struct format_data { int count; char format; char size; /* True if the value should be printed raw -- that is, bypassing python-based formatters. */ unsigned char raw; }; /* Last specified output format. */ static char last_format = 0; /* Last specified examination size. 'b', 'h', 'w' or `q'. */ static char last_size = 'w'; /* 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 struct value *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) { fprintf_filtered (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 int print_symbol_filename = 0; static void show_print_symbol_filename (struct ui_file *file, int from_tty, struct cmd_list_element *c, const char *value) { fprintf_filtered (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; struct display { /* Chain link to next auto-display item. */ struct display *next; /* The expression as the user typed it. */ char *exp_string; /* Expression to be evaluated and displayed. */ struct expression *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). */ int enabled_p; }; /* Chain of expressions whose values should be displayed automatically each time the program stops. */ static struct display *display_chain; static int display_number; /* Walk the following statement or block through all displays. ALL_DISPLAYS_SAFE does so even if the statement deletes the current display. */ #define ALL_DISPLAYS(B) \ for (B = display_chain; B; B = B->next) #define ALL_DISPLAYS_SAFE(B,TMP) \ for (B = display_chain; \ B ? (TMP = B->next, 1): 0; \ B = TMP) /* Prototypes for exported functions. */ void _initialize_printcmd (void); /* 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; 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 >= 'a' && *p <= 'z') val.format = *p++; else break; } while (*p == ' ' || *p == '\t') p++; *string_ptr = 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 (value_type (val)); int len = TYPE_LENGTH (type); if (VALUE_LVAL (val) == lval_memory) next_address = value_address (val) + len; if (size) { switch (options->format) { case 's': { struct type *elttype = value_type (val); next_address = (value_address (val) + val_print_string (elttype, NULL, value_address (val), -1, stream, options) * len); } return; case 'i': /* We often wrap here if there are long symbolic names. */ wrap_here (" "); next_address = (value_address (val) + gdb_print_insn (get_type_arch (type), value_address (val), stream, &branch_delay_insns)); return; } } if (options->format == 0 || options->format == 's' || TYPE_CODE (type) == TYPE_CODE_REF || TYPE_CODE (type) == TYPE_CODE_ARRAY || TYPE_CODE (type) == TYPE_CODE_STRING || TYPE_CODE (type) == TYPE_CODE_STRUCT || TYPE_CODE (type) == TYPE_CODE_UNION || TYPE_CODE (type) == 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. */ val_print_scalar_formatted (type, value_contents_for_printing (val), value_embedded_offset (val), 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 = get_type_arch (type); const struct builtin_type *builtin = builtin_type (gdbarch); if (TYPE_LENGTH (type) == TYPE_LENGTH (builtin->builtin_float)) type = builtin->builtin_float; else if (TYPE_LENGTH (type) == TYPE_LENGTH (builtin->builtin_double)) type = builtin->builtin_double; else if (TYPE_LENGTH (type) == TYPE_LENGTH (builtin->builtin_long_double)) 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 void *valaddr, struct type *type, const struct value_print_options *options, int size, struct ui_file *stream) { struct gdbarch *gdbarch = get_type_arch (type); LONGEST val_long = 0; unsigned int len = TYPE_LENGTH (type); enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); /* String printing should go through val_print_scalar_formatted. */ gdb_assert (options->format != 's'); if (len > sizeof(LONGEST) && (TYPE_CODE (type) == TYPE_CODE_INT || TYPE_CODE (type) == TYPE_CODE_ENUM)) { switch (options->format) { case 'o': print_octal_chars (stream, valaddr, len, byte_order); return; case 'u': case 'd': print_decimal_chars (stream, valaddr, len, byte_order); return; case 't': print_binary_chars (stream, valaddr, len, byte_order); return; case 'x': print_hex_chars (stream, valaddr, len, byte_order); return; case 'c': print_char_chars (stream, type, valaddr, len, byte_order); return; default: break; }; } if (options->format != 'f') val_long = unpack_long (type, valaddr); /* 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 (type). */ if (TYPE_CODE (type) == 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 != 'd' || TYPE_UNSIGNED (type)) { if (len < sizeof (LONGEST)) val_long &= ((LONGEST) 1 << HOST_CHAR_BIT * len) - 1; } switch (options->format) { case 'x': if (!size) { /* No size specified, like in print. Print varying # of digits. */ print_longest (stream, 'x', 1, val_long); } else switch (size) { case 'b': case 'h': case 'w': case 'g': print_longest (stream, size, 1, val_long); break; default: error (_("Undefined output size \"%c\"."), size); } break; case 'd': print_longest (stream, 'd', 1, val_long); break; case 'u': print_longest (stream, 'u', 0, val_long); break; case 'o': if (val_long) print_longest (stream, 'o', 1, val_long); else fprintf_filtered (stream, "0"); break; case 'a': { CORE_ADDR addr = unpack_pointer (type, valaddr); print_address (gdbarch, addr, stream); } break; case 'c': { struct value_print_options opts = *options; opts.format = 0; if (TYPE_UNSIGNED (type)) 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 'f': type = float_type_from_length (type); print_floating (valaddr, type, stream); break; case 0: internal_error (__FILE__, __LINE__, _("failed internal consistency check")); case 't': /* Binary; 't' stands for "two". */ { char bits[8 * (sizeof val_long) + 1]; char buf[8 * (sizeof val_long) + 32]; char *cp = bits; int width; if (!size) width = 8 * (sizeof val_long); else switch (size) { case 'b': width = 8; break; case 'h': width = 16; break; case 'w': width = 32; break; case 'g': width = 64; break; default: error (_("Undefined output size \"%c\"."), size); } bits[width] = '\0'; while (width-- > 0) { bits[width] = (val_long & 1) ? '1' : '0'; val_long >>= 1; } if (!size) { while (*cp && *cp == '0') cp++; if (*cp == '\0') cp--; } strncpy (buf, cp, sizeof (bits)); fputs_filtered (buf, stream); } break; case 'z': print_hex_chars (stream, valaddr, len, byte_order); break; default: error (_("Undefined output format \"%c\"."), options->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, char *leadin) { char *name = NULL; char *filename = NULL; int unmapped = 0; int offset = 0; int line = 0; /* Throw away both name and filename. */ struct cleanup *cleanup_chain = make_cleanup (free_current_contents, &name); make_cleanup (free_current_contents, &filename); if (build_address_symbolic (gdbarch, addr, do_demangle, &name, &offset, &filename, &line, &unmapped)) { do_cleanups (cleanup_chain); return 0; } fputs_filtered (leadin, stream); if (unmapped) fputs_filtered ("<*", stream); else fputs_filtered ("<", stream); fputs_filtered (name, stream); if (offset != 0) fprintf_filtered (stream, "+%u", (unsigned int) 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 != NULL) { if (line != -1) fprintf_filtered (stream, " at %s:%d", filename, line); else fprintf_filtered (stream, " in %s", filename); } if (unmapped) fputs_filtered ("*>", stream); else fputs_filtered (">", stream); do_cleanups (cleanup_chain); return 1; } /* Given an address ADDR return all the elements needed to print the address in a symbolic form. NAME can be mangled or not depending on DO_DEMANGLE (and also on the asm_demangle global variable, manipulated via ''set print asm-demangle''). Return 0 in case of success, when all the info in the OUT paramters is valid. Return 1 otherwise. */ int build_address_symbolic (struct gdbarch *gdbarch, CORE_ADDR addr, /* IN */ int do_demangle, /* IN */ char **name, /* OUT */ int *offset, /* OUT */ char **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); } } /* First try to find the address in the symbol table, then in the minsyms. Take the closest one. */ /* 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 = BLOCK_START (SYMBOL_BLOCK_VALUE (symbol)); if (do_demangle || asm_demangle) name_temp = SYMBOL_PRINT_NAME (symbol); else name_temp = SYMBOL_LINKAGE_NAME (symbol); } if (msymbol.minsym != NULL && MSYMBOL_HAS_SIZE (msymbol.minsym) && MSYMBOL_SIZE (msymbol.minsym) == 0 && MSYMBOL_TYPE (msymbol.minsym) != mst_text && MSYMBOL_TYPE (msymbol.minsym) != mst_text_gnu_ifunc && MSYMBOL_TYPE (msymbol.minsym) != mst_file_text) msymbol.minsym = NULL; if (msymbol.minsym != NULL) { if (BMSYMBOL_VALUE_ADDRESS (msymbol) > name_location || symbol == NULL) { /* 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_TYPE (msymbol.minsym) == mst_text || MSYMBOL_TYPE (msymbol.minsym) == mst_text_gnu_ifunc || MSYMBOL_TYPE (msymbol.minsym) == mst_file_text || MSYMBOL_TYPE (msymbol.minsym) == mst_solib_trampoline) addr = gdbarch_addr_bits_remove (gdbarch, addr); /* The msymbol is closer to the address than the symbol; use the msymbol instead. */ symbol = 0; name_location = BMSYMBOL_VALUE_ADDRESS (msymbol); if (do_demangle || asm_demangle) name_temp = MSYMBOL_PRINT_NAME (msymbol.minsym); else name_temp = MSYMBOL_LINKAGE_NAME (msymbol.minsym); } } 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 = addr - name_location; *name = xstrdup (name_temp); if (print_symbol_filename) { struct symtab_and_line sal; sal = find_pc_sect_line (addr, section, 0); if (sal.symtab) { *filename = xstrdup (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_filtered (paddress (gdbarch, addr), 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 ()) { struct frame_info *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_filtered (paddress (gdbarch, addr), stream); print_address_symbolic (gdbarch, addr, stream, do_demangle, " "); } else { return print_address_symbolic (gdbarch, addr, stream, do_demangle, ""); } return 1; } /* 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; 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 (__FILE__, __LINE__, _("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); /* 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; if (format == 'i') fputs_filtered (pc_prefix (next_address), gdb_stdout); print_address (next_gdbarch, next_address, gdb_stdout); printf_filtered (":"); for (i = maxelts; i > 0 && count > 0; i--, count--) { printf_filtered ("\t"); /* Note that print_formatted sets next_address for the next object. */ last_examine_address = next_address; if (last_examine_value) value_free (last_examine_value); /* 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 = value_at_lazy (val_type, next_address); if (last_examine_value) release_value (last_examine_value); print_formatted (last_examine_value, size, &opts, gdb_stdout); /* Display any branch delay slots following the final insn. */ if (format == 'i' && count == 1) count += branch_delay_insns; } printf_filtered ("\n"); gdb_flush (gdb_stdout); } } static void validate_format (struct format_data fmt, 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); } /* Evaluate string EXP as an expression in the current language and print the resulting value. EXP may contain a format specifier as the first argument ("/x myvar" for example, to print myvar in hex). */ static void print_command_1 (const char *exp, int voidprint) { struct expression *expr; struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); char format = 0; struct value *val; struct format_data fmt; if (exp && *exp == '/') { exp++; fmt = decode_format (&exp, last_format, 0); validate_format (fmt, "print"); last_format = format = fmt.format; } else { fmt.count = 1; fmt.format = 0; fmt.size = 0; fmt.raw = 0; } if (exp && *exp) { expr = parse_expression (exp); make_cleanup (free_current_contents, &expr); val = evaluate_expression (expr); } else val = access_value_history (0); if (voidprint || (val && value_type (val) && TYPE_CODE (value_type (val)) != TYPE_CODE_VOID)) { struct value_print_options opts; int histindex = record_latest_value (val); annotate_value_history_begin (histindex, value_type (val)); printf_filtered ("$%d = ", histindex); annotate_value_history_value (); get_formatted_print_options (&opts, format); opts.raw = fmt.raw; print_formatted (val, fmt.size, &opts, gdb_stdout); printf_filtered ("\n"); annotate_value_history_end (); } do_cleanups (old_chain); } static void print_command (char *exp, int from_tty) { print_command_1 (exp, 1); } /* Same as print, except it doesn't print void results. */ static void call_command (char *exp, int from_tty) { print_command_1 (exp, 0); } /* Implementation of the "output" command. */ static void output_command (char *exp, int from_tty) { output_command_const (exp, from_tty); } /* Like output_command, but takes a const string as argument. */ void output_command_const (const char *exp, int from_tty) { struct expression *expr; struct cleanup *old_chain; 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; } expr = parse_expression (exp); old_chain = make_cleanup (free_current_contents, &expr); val = evaluate_expression (expr); annotate_value_begin (value_type (val)); get_formatted_print_options (&opts, format); opts.raw = fmt.raw; print_formatted (val, fmt.size, &opts, gdb_stdout); annotate_value_end (); wrap_here (""); gdb_flush (gdb_stdout); do_cleanups (old_chain); } static void set_command (char *exp, int from_tty) { struct expression *expr = parse_expression (exp); struct cleanup *old_chain = make_cleanup (free_current_contents, &expr); if (expr->nelts >= 1) switch (expr->elts[0].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)")); } evaluate_expression (expr); do_cleanups (old_chain); } static void sym_info (char *arg, int from_tty) { struct minimal_symbol *msymbol; struct objfile *objfile; struct obj_section *osect; CORE_ADDR addr, sect_addr; int matches = 0; unsigned int offset; if (!arg) error_no_arg (_("address")); addr = parse_and_eval_address (arg); ALL_OBJSECTIONS (objfile, osect) { /* 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 (obj_section_addr (osect) <= sect_addr && sect_addr < obj_section_endaddr (osect) && (msymbol = lookup_minimal_symbol_by_pc_section (sect_addr, osect).minsym)) { const char *obj_name, *mapped, *sec_name, *msym_name; char *loc_string; struct cleanup *old_chain; matches = 1; offset = sect_addr - MSYMBOL_VALUE_ADDRESS (objfile, msymbol); mapped = section_is_mapped (osect) ? _("mapped") : _("unmapped"); sec_name = osect->the_bfd_section->name; msym_name = MSYMBOL_PRINT_NAME (msymbol); /* Don't print the offset if it is zero. We assume there's no need to handle i18n of "sym + offset". */ if (offset) loc_string = xstrprintf ("%s + %u", msym_name, offset); else loc_string = xstrprintf ("%s", msym_name); /* Use a cleanup to free loc_string in case the user quits a pagination request inside printf_filtered. */ old_chain = make_cleanup (xfree, loc_string); gdb_assert (osect->objfile && objfile_name (osect->objfile)); obj_name = objfile_name (osect->objfile); if (MULTI_OBJFILE_P ()) if (pc_in_unmapped_range (addr, osect)) if (section_is_overlay (osect)) printf_filtered (_("%s in load address range of " "%s overlay section %s of %s\n"), loc_string, mapped, sec_name, obj_name); else printf_filtered (_("%s in load address range of " "section %s of %s\n"), loc_string, sec_name, obj_name); else if (section_is_overlay (osect)) printf_filtered (_("%s in %s overlay section %s of %s\n"), loc_string, mapped, sec_name, obj_name); else printf_filtered (_("%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)) printf_filtered (_("%s in load address range of %s overlay " "section %s\n"), loc_string, mapped, sec_name); else printf_filtered (_("%s in load address range of section %s\n"), loc_string, sec_name); else if (section_is_overlay (osect)) printf_filtered (_("%s in %s overlay section %s\n"), loc_string, mapped, sec_name); else printf_filtered (_("%s in section %s\n"), loc_string, sec_name); do_cleanups (old_chain); } } if (matches == 0) printf_filtered (_("No symbol matches %s.\n"), arg); } static void address_info (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), VAR_DOMAIN, &is_a_field_of_this); if (sym == NULL) { if (is_a_field_of_this.type != NULL) { printf_filtered ("Symbol \""); fprintf_symbol_filtered (gdb_stdout, exp, current_language->la_language, DMGL_ANSI); printf_filtered ("\" is a field of the local class variable "); if (current_language->la_language == language_objc) printf_filtered ("`self'\n"); /* ObjC equivalent of "this" */ else printf_filtered ("`this'\n"); return; } msymbol = lookup_bound_minimal_symbol (exp); if (msymbol.minsym != NULL) { struct objfile *objfile = msymbol.objfile; gdbarch = get_objfile_arch (objfile); load_addr = BMSYMBOL_VALUE_ADDRESS (msymbol); printf_filtered ("Symbol \""); fprintf_symbol_filtered (gdb_stdout, exp, current_language->la_language, DMGL_ANSI); printf_filtered ("\" is at "); fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout); printf_filtered (" in a file compiled without debugging"); section = MSYMBOL_OBJ_SECTION (objfile, msymbol.minsym); if (section_is_overlay (section)) { load_addr = overlay_unmapped_address (load_addr, section); printf_filtered (",\n -- loaded at "); fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout); printf_filtered (" in overlay section %s", section->the_bfd_section->name); } printf_filtered (".\n"); } else error (_("No symbol \"%s\" in current context."), exp); return; } printf_filtered ("Symbol \""); fprintf_symbol_filtered (gdb_stdout, SYMBOL_PRINT_NAME (sym), current_language->la_language, DMGL_ANSI); printf_filtered ("\" is "); val = SYMBOL_VALUE (sym); section = SYMBOL_OBJ_SECTION (SYMBOL_OBJFILE (sym), sym); gdbarch = get_objfile_arch (SYMBOL_SYMTAB (sym)->objfile); if (SYMBOL_COMPUTED_OPS (sym) != NULL) { SYMBOL_COMPUTED_OPS (sym)->describe_location (sym, context_pc, gdb_stdout); printf_filtered (".\n"); return; } switch (SYMBOL_CLASS (sym)) { case LOC_CONST: case LOC_CONST_BYTES: printf_filtered ("constant"); break; case LOC_LABEL: printf_filtered ("a label at address "); load_addr = SYMBOL_VALUE_ADDRESS (sym); fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout); if (section_is_overlay (section)) { load_addr = overlay_unmapped_address (load_addr, section); printf_filtered (",\n -- loaded at "); fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout); printf_filtered (" 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 = SYMBOL_REGISTER_OPS (sym)->register_number (sym, gdbarch); if (SYMBOL_IS_ARGUMENT (sym)) printf_filtered (_("an argument in register %s"), gdbarch_register_name (gdbarch, regno)); else printf_filtered (_("a variable in register %s"), gdbarch_register_name (gdbarch, regno)); break; case LOC_STATIC: printf_filtered (_("static storage at address ")); load_addr = SYMBOL_VALUE_ADDRESS (sym); fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout); if (section_is_overlay (section)) { load_addr = overlay_unmapped_address (load_addr, section); printf_filtered (_(",\n -- loaded at ")); fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout); printf_filtered (_(" in overlay section %s"), section->the_bfd_section->name); } break; case LOC_REGPARM_ADDR: /* Note comment at LOC_REGISTER. */ regno = SYMBOL_REGISTER_OPS (sym)->register_number (sym, gdbarch); printf_filtered (_("address of an argument in register %s"), gdbarch_register_name (gdbarch, regno)); break; case LOC_ARG: printf_filtered (_("an argument at offset %ld"), val); break; case LOC_LOCAL: printf_filtered (_("a local variable at frame offset %ld"), val); break; case LOC_REF_ARG: printf_filtered (_("a reference argument at offset %ld"), val); break; case LOC_TYPEDEF: printf_filtered (_("a typedef")); break; case LOC_BLOCK: printf_filtered (_("a function at address ")); load_addr = BLOCK_START (SYMBOL_BLOCK_VALUE (sym)); fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout); if (section_is_overlay (section)) { load_addr = overlay_unmapped_address (load_addr, section); printf_filtered (_(",\n -- loaded at ")); fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout); printf_filtered (_(" in overlay section %s"), section->the_bfd_section->name); } break; case LOC_UNRESOLVED: { struct bound_minimal_symbol msym; msym = lookup_minimal_symbol_and_objfile (SYMBOL_LINKAGE_NAME (sym)); if (msym.minsym == NULL) printf_filtered ("unresolved"); else { section = MSYMBOL_OBJ_SECTION (msym.objfile, msym.minsym); load_addr = BMSYMBOL_VALUE_ADDRESS (msym); if (section && (section->the_bfd_section->flags & SEC_THREAD_LOCAL) != 0) printf_filtered (_("a thread-local variable at offset %s " "in the thread-local storage for `%s'"), paddress (gdbarch, load_addr), objfile_name (section->objfile)); else { printf_filtered (_("static storage at address ")); fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout); if (section_is_overlay (section)) { load_addr = overlay_unmapped_address (load_addr, section); printf_filtered (_(",\n -- loaded at ")); fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout); printf_filtered (_(" in overlay section %s"), section->the_bfd_section->name); } } } } break; case LOC_OPTIMIZED_OUT: printf_filtered (_("optimized out")); break; default: printf_filtered (_("of unknown (botched) type")); break; } printf_filtered (".\n"); } static void x_command (char *exp, int from_tty) { struct expression *expr; struct format_data fmt; struct cleanup *old_chain; struct value *val; fmt.format = last_format ? last_format : 'x'; fmt.size = last_size; fmt.count = 1; fmt.raw = 0; if (exp && *exp == '/') { const char *tmp = exp + 1; fmt = decode_format (&tmp, last_format, last_size); exp = (char *) tmp; } /* If we have an expression, evaluate it and use it as the address. */ if (exp != 0 && *exp != 0) { 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) *exp = 0; old_chain = make_cleanup (free_current_contents, &expr); val = evaluate_expression (expr); if (TYPE_CODE (value_type (val)) == TYPE_CODE_REF) val = coerce_ref (val); /* In rvalue contexts, such as this, functions are coerced into pointers to functions. This makes "x/i main" work. */ if (/* last_format == 'i' && */ TYPE_CODE (value_type (val)) == TYPE_CODE_FUNC && VALUE_LVAL (val) == lval_memory) next_address = value_address (val); else next_address = value_as_address (val); next_gdbarch = expr->gdbarch; do_cleanups (old_chain); } 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; /* Set a couple of internal variables if appropriate. */ if (last_examine_value) { /* Make last address examined available to the user as $_. Use the correct pointer type. */ struct type *pointer_type = lookup_pointer_type (value_type (last_examine_value)); 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 $__ variable. */ if (value_lazy (last_examine_value)) clear_internalvar (lookup_internalvar ("__")); else set_internalvar (lookup_internalvar ("__"), last_examine_value); } } /* Add an expression to the auto-display chain. Specify the expression. */ static void display_command (char *arg, int from_tty) { struct format_data fmt; struct expression *expr; struct display *new; int display_it = 1; const char *exp = arg; #if defined(TUI) /* NOTE: cagney/2003-02-13 The `tui_active' was previously `tui_version'. */ if (tui_active && exp != NULL && *exp == '$') display_it = (tui_set_layout_for_display_command (exp) == TUI_FAILURE); #endif if (display_it) { 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 = NULL; expr = parse_expression (exp); new = (struct display *) xmalloc (sizeof (struct display)); new->exp_string = xstrdup (exp); new->exp = expr; new->block = innermost_block; new->pspace = current_program_space; new->next = display_chain; new->number = ++display_number; new->format = fmt; new->enabled_p = 1; display_chain = new; if (from_tty) do_one_display (new); dont_repeat (); } } static void free_display (struct display *d) { xfree (d->exp_string); xfree (d->exp); xfree (d); } /* Clear out the display_chain. Done when new symtabs are loaded, since this invalidates the types stored in many expressions. */ void clear_displays (void) { struct display *d; while ((d = display_chain) != NULL) { display_chain = d->next; free_display (d); } } /* Delete the auto-display DISPLAY. */ static void delete_display (struct display *display) { struct display *d; gdb_assert (display != NULL); if (display_chain == display) display_chain = display->next; ALL_DISPLAYS (d) if (d->next == display) { d->next = display->next; break; } free_display (display); } /* Call FUNCTION on each of the displays whose numbers are given in ARGS. DATA is passed unmodified to FUNCTION. */ static void map_display_numbers (char *args, void (*function) (struct display *, void *), void *data) { struct get_number_or_range_state state; int num; if (args == NULL) error_no_arg (_("one or more display numbers")); init_number_or_range (&state, args); while (!state.finished) { const char *p = state.string; num = get_number_or_range (&state); if (num == 0) warning (_("bad display number at or near '%s'"), p); else { struct display *d, *tmp; ALL_DISPLAYS_SAFE (d, tmp) if (d->number == num) break; if (d == NULL) printf_unfiltered (_("No display number %d.\n"), num); else function (d, data); } } } /* Callback for map_display_numbers, that deletes a display. */ static void do_delete_display (struct display *d, void *data) { delete_display (d); } /* "undisplay" command. */ static void undisplay_command (char *args, int from_tty) { if (args == NULL) { if (query (_("Delete all auto-display expressions? "))) clear_displays (); dont_repeat (); return; } map_display_numbers (args, do_delete_display, NULL); 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) { struct cleanup *old_chain; int within_current_scope; if (d->enabled_p == 0) 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 ()) { xfree (d->exp); d->exp = NULL; d->block = NULL; } if (d->exp == NULL) { volatile struct gdb_exception ex; TRY_CATCH (ex, RETURN_MASK_ALL) { innermost_block = NULL; d->exp = parse_expression (d->exp_string); d->block = innermost_block; } if (ex.reason < 0) { /* Can't re-parse the expression. Disable this display item. */ d->enabled_p = 0; warning (_("Unable to display \"%s\": %s"), d->exp_string, ex.message); return; } } if (d->block) { if (d->pspace == current_program_space) within_current_scope = contained_in (get_selected_block (0), d->block); else within_current_scope = 0; } else within_current_scope = 1; if (!within_current_scope) return; old_chain = make_cleanup_restore_integer (¤t_display_number); current_display_number = d->number; annotate_display_begin (); printf_filtered ("%d", d->number); annotate_display_number_end (); printf_filtered (": "); if (d->format.size) { volatile struct gdb_exception ex; annotate_display_format (); printf_filtered ("x/"); if (d->format.count != 1) printf_filtered ("%d", d->format.count); printf_filtered ("%c", d->format.format); if (d->format.format != 'i' && d->format.format != 's') printf_filtered ("%c", d->format.size); printf_filtered (" "); annotate_display_expression (); puts_filtered (d->exp_string); annotate_display_expression_end (); if (d->format.count != 1 || d->format.format == 'i') printf_filtered ("\n"); else printf_filtered (" "); annotate_display_value (); TRY_CATCH (ex, RETURN_MASK_ERROR) { struct value *val; CORE_ADDR addr; val = evaluate_expression (d->exp); 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); } if (ex.reason < 0) fprintf_filtered (gdb_stdout, _("<error: %s>\n"), ex.message); } else { struct value_print_options opts; volatile struct gdb_exception ex; annotate_display_format (); if (d->format.format) printf_filtered ("/%c ", d->format.format); annotate_display_expression (); puts_filtered (d->exp_string); annotate_display_expression_end (); printf_filtered (" = "); annotate_display_expression (); get_formatted_print_options (&opts, d->format.format); opts.raw = d->format.raw; TRY_CATCH (ex, RETURN_MASK_ERROR) { struct value *val; val = evaluate_expression (d->exp); print_formatted (val, d->format.size, &opts, gdb_stdout); } if (ex.reason < 0) fprintf_filtered (gdb_stdout, _("<error: %s>"), ex.message); printf_filtered ("\n"); } annotate_display_end (); gdb_flush (gdb_stdout); do_cleanups (old_chain); } /* Display all of the values on the auto-display chain which can be evaluated in the current scope. */ void do_displays (void) { struct display *d; for (d = display_chain; d; d = d->next) do_one_display (d); } /* 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) { struct display *d; for (d = display_chain; d; d = d->next) if (d->number == num) { d->enabled_p = 0; return; } printf_unfiltered (_("No display number %d.\n"), num); } void disable_current_display (void) { if (current_display_number >= 0) { disable_display (current_display_number); fprintf_unfiltered (gdb_stderr, _("Disabling display %d to " "avoid infinite recursion.\n"), current_display_number); } current_display_number = -1; } static void display_info (char *ignore, int from_tty) { struct display *d; if (!display_chain) printf_unfiltered (_("There are no auto-display expressions now.\n")); else printf_filtered (_("Auto-display expressions now in effect:\n\ Num Enb Expression\n")); for (d = display_chain; d; d = d->next) { printf_filtered ("%d: %c ", d->number, "ny"[(int) d->enabled_p]); if (d->format.size) printf_filtered ("/%d%c%c ", d->format.count, d->format.size, d->format.format); else if (d->format.format) printf_filtered ("/%c ", d->format.format); puts_filtered (d->exp_string); if (d->block && !contained_in (get_selected_block (0), d->block)) printf_filtered (_(" (cannot be evaluated in the current context)")); printf_filtered ("\n"); gdb_flush (gdb_stdout); } } /* Callback fo map_display_numbers, that enables or disables the passed in display D. */ static void do_enable_disable_display (struct display *d, void *data) { d->enabled_p = *(int *) data; } /* Implamentation of both the "disable display" and "enable display" commands. ENABLE decides what to do. */ static void enable_disable_display_command (char *args, int from_tty, int enable) { if (args == NULL) { struct display *d; ALL_DISPLAYS (d) d->enabled_p = enable; return; } map_display_numbers (args, do_enable_disable_display, &enable); } /* The "enable display" command. */ static void enable_display_command (char *args, int from_tty) { enable_disable_display_command (args, from_tty, 1); } /* The "disable display" command. */ static void disable_display_command (char *args, int from_tty) { enable_disable_display_command (args, from_tty, 0); } /* 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) { struct display *d; struct program_space *pspace; /* With no symbol file we cannot have a block or expression from it. */ if (objfile == NULL) return; pspace = objfile->pspace; if (objfile->separate_debug_objfile_backlink) { objfile = objfile->separate_debug_objfile_backlink; gdb_assert (objfile->pspace == pspace); } for (d = display_chain; d != NULL; d = d->next) { if (d->pspace != pspace) continue; if (lookup_objfile_from_block (d->block) == objfile || (d->exp && exp_uses_objfile (d->exp, objfile))) { xfree (d->exp); d->exp = NULL; 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. This function invalidates FRAME. */ void print_variable_and_value (const char *name, struct symbol *var, struct frame_info *frame, struct ui_file *stream, int indent) { volatile struct gdb_exception except; if (!name) name = SYMBOL_PRINT_NAME (var); fprintf_filtered (stream, "%s%s = ", n_spaces (2 * indent), name); TRY_CATCH (except, RETURN_MASK_ERROR) { struct value *val; struct value_print_options opts; val = read_var_value (var, frame); get_user_print_options (&opts); opts.deref_ref = 1; common_val_print (val, stream, indent, &opts, current_language); /* common_val_print invalidates FRAME when a pretty printer calls inferior function. */ frame = NULL; } if (except.reason < 0) fprintf_filtered(stream, "<error reading variable %s (%s)>", name, except.message); fprintf_filtered (stream, "\n"); } /* Subroutine of ui_printf to simplify it. Print VALUE to STREAM using FORMAT. VALUE is a C-style string on the target. */ static void printf_c_string (struct ui_file *stream, const char *format, struct value *value) { gdb_byte *str; CORE_ADDR tem; int j; tem = value_as_address (value); /* This is a %s argument. Find the length of the string. */ for (j = 0;; j++) { gdb_byte c; QUIT; read_memory (tem + j, &c, 1); if (c == 0) break; } /* Copy the string contents into a string inside GDB. */ str = (gdb_byte *) alloca (j + 1); if (j != 0) read_memory (tem, str, j); str[j] = 0; fprintf_filtered (stream, format, (char *) str); } /* Subroutine of ui_printf to simplify it. Print VALUE to STREAM using FORMAT. VALUE is a wide C-style string on the target. */ static void printf_wide_c_string (struct ui_file *stream, const char *format, struct value *value) { gdb_byte *str; CORE_ADDR tem; int j; struct gdbarch *gdbarch = get_type_arch (value_type (value)); enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); struct type *wctype = lookup_typename (current_language, gdbarch, "wchar_t", NULL, 0); int wcwidth = TYPE_LENGTH (wctype); gdb_byte *buf = alloca (wcwidth); struct obstack output; struct cleanup *inner_cleanup; tem = value_as_address (value); /* This is a %s argument. Find the length of the string. */ for (j = 0;; j += wcwidth) { QUIT; read_memory (tem + j, buf, wcwidth); if (extract_unsigned_integer (buf, wcwidth, byte_order) == 0) break; } /* Copy the string contents into a string inside GDB. */ str = (gdb_byte *) alloca (j + wcwidth); if (j != 0) read_memory (tem, str, j); memset (&str[j], 0, wcwidth); obstack_init (&output); inner_cleanup = make_cleanup_obstack_free (&output); convert_between_encodings (target_wide_charset (gdbarch), host_charset (), str, j, wcwidth, &output, translit_char); obstack_grow_str0 (&output, ""); fprintf_filtered (stream, format, obstack_base (&output)); do_cleanups (inner_cleanup); } /* Subroutine of ui_printf to simplify it. Print VALUE, a decimal floating point value, to STREAM using FORMAT. */ static void printf_decfloat (struct ui_file *stream, const char *format, struct value *value) { const gdb_byte *param_ptr = value_contents (value); #if defined (PRINTF_HAS_DECFLOAT) /* If we have native support for Decimal floating printing, handle it here. */ fprintf_filtered (stream, format, param_ptr); #else /* As a workaround until vasprintf has native support for DFP we convert the DFP values to string and print them using the %s format specifier. */ const char *p; /* Parameter data. */ struct type *param_type = value_type (value); struct gdbarch *gdbarch = get_type_arch (param_type); enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); /* DFP output data. */ struct value *dfp_value = NULL; gdb_byte *dfp_ptr; int dfp_len = 16; gdb_byte dec[16]; struct type *dfp_type = NULL; char decstr[MAX_DECIMAL_STRING]; /* Points to the end of the string so that we can go back and check for DFP length modifiers. */ p = format + strlen (format); /* Look for the float/double format specifier. */ while (*p != 'f' && *p != 'e' && *p != 'E' && *p != 'g' && *p != 'G') p--; /* Search for the '%' char and extract the size and type of the output decimal value based on its modifiers (%Hf, %Df, %DDf). */ while (*--p != '%') { if (*p == 'H') { dfp_len = 4; dfp_type = builtin_type (gdbarch)->builtin_decfloat; } else if (*p == 'D' && *(p - 1) == 'D') { dfp_len = 16; dfp_type = builtin_type (gdbarch)->builtin_declong; p--; } else { dfp_len = 8; dfp_type = builtin_type (gdbarch)->builtin_decdouble; } } /* Conversion between different DFP types. */ if (TYPE_CODE (param_type) == TYPE_CODE_DECFLOAT) decimal_convert (param_ptr, TYPE_LENGTH (param_type), byte_order, dec, dfp_len, byte_order); else /* If this is a non-trivial conversion, just output 0. A correct converted value can be displayed by explicitly casting to a DFP type. */ decimal_from_string (dec, dfp_len, byte_order, "0"); dfp_value = value_from_decfloat (dfp_type, dec); dfp_ptr = (gdb_byte *) value_contents (dfp_value); decimal_to_string (dfp_ptr, dfp_len, byte_order, decstr); /* Print the DFP value. */ fprintf_filtered (stream, "%s", decstr); #endif } /* 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)". */ const char *p; char *fmt, *fmt_p; #ifdef PRINTF_HAS_LONG_LONG long long val = value_as_long (value); #else long val = value_as_long (value); #endif fmt = alloca (strlen (format) + 5); /* Copy up to the leading %. */ p = format; fmt_p = fmt; while (*p) { int is_percent = (*p == '%'); *fmt_p++ = *p++; if (is_percent) { if (*p == '%') *fmt_p++ = *p++; else break; } } if (val != 0) *fmt_p++ = '#'; /* Copy any width. */ while (*p >= '0' && *p < '9') *fmt_p++ = *p++; gdb_assert (*p == 'p' && *(p + 1) == '\0'); if (val != 0) { #ifdef PRINTF_HAS_LONG_LONG *fmt_p++ = 'l'; #endif *fmt_p++ = 'l'; *fmt_p++ = 'x'; *fmt_p++ = '\0'; fprintf_filtered (stream, fmt, val); } else { *fmt_p++ = 's'; *fmt_p++ = '\0'; fprintf_filtered (stream, fmt, "(nil)"); } } /* printf "printf format string" ARG to STREAM. */ static void ui_printf (const char *arg, struct ui_file *stream) { struct format_piece *fpieces; const char *s = arg; struct value **val_args; int allocated_args = 20; struct cleanup *old_cleanups; val_args = xmalloc (allocated_args * sizeof (struct value *)); old_cleanups = make_cleanup (free_current_contents, &val_args); if (s == 0) error_no_arg (_("format-control string and values to print")); s = skip_spaces_const (s); /* A format string should follow, enveloped in double quotes. */ if (*s++ != '"') error (_("Bad format string, missing '\"'.")); fpieces = parse_format_string (&s); make_cleanup (free_format_pieces_cleanup, &fpieces); if (*s++ != '"') error (_("Bad format string, non-terminated '\"'.")); s = skip_spaces_const (s); if (*s != ',' && *s != 0) error (_("Invalid argument syntax")); if (*s == ',') s++; s = skip_spaces_const (s); { int nargs = 0; int nargs_wanted; int i, fr; char *current_substring; nargs_wanted = 0; for (fr = 0; fpieces[fr].string != NULL; fr++) if (fpieces[fr].argclass != literal_piece) ++nargs_wanted; /* Now, parse all arguments and evaluate them. Store the VALUEs in VAL_ARGS. */ while (*s != '\0') { const char *s1; if (nargs == allocated_args) val_args = (struct value **) xrealloc ((char *) val_args, (allocated_args *= 2) * sizeof (struct value *)); s1 = s; val_args[nargs] = parse_to_comma_and_eval (&s1); nargs++; s = s1; if (*s == ',') s++; } if (nargs != nargs_wanted) error (_("Wrong number of arguments for specified format-string")); /* Now actually print them. */ i = 0; for (fr = 0; fpieces[fr].string != NULL; fr++) { current_substring = fpieces[fr].string; switch (fpieces[fr].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 = get_type_arch (value_type (val_args[i])); struct type *wctype = lookup_typename (current_language, gdbarch, "wchar_t", NULL, 0); struct type *valtype; struct obstack output; struct cleanup *inner_cleanup; const gdb_byte *bytes; valtype = value_type (val_args[i]); if (TYPE_LENGTH (valtype) != TYPE_LENGTH (wctype) || TYPE_CODE (valtype) != TYPE_CODE_INT) error (_("expected wchar_t argument for %%lc")); bytes = value_contents (val_args[i]); obstack_init (&output); inner_cleanup = make_cleanup_obstack_free (&output); convert_between_encodings (target_wide_charset (gdbarch), host_charset (), bytes, TYPE_LENGTH (valtype), TYPE_LENGTH (valtype), &output, translit_char); obstack_grow_str0 (&output, ""); fprintf_filtered (stream, current_substring, obstack_base (&output)); do_cleanups (inner_cleanup); } break; case double_arg: { struct type *type = value_type (val_args[i]); DOUBLEST val; int inv; /* If format string wants a float, unchecked-convert the value to floating point of the same size. */ type = float_type_from_length (type); val = unpack_double (type, value_contents (val_args[i]), &inv); if (inv) error (_("Invalid floating value found in program.")); fprintf_filtered (stream, current_substring, (double) val); break; } case long_double_arg: #ifdef HAVE_LONG_DOUBLE { struct type *type = value_type (val_args[i]); DOUBLEST val; int inv; /* If format string wants a float, unchecked-convert the value to floating point of the same size. */ type = float_type_from_length (type); val = unpack_double (type, value_contents (val_args[i]), &inv); if (inv) error (_("Invalid floating value found in program.")); fprintf_filtered (stream, current_substring, (long double) val); break; } #else error (_("long double not supported in printf")); #endif case long_long_arg: #ifdef PRINTF_HAS_LONG_LONG { long long val = value_as_long (val_args[i]); fprintf_filtered (stream, current_substring, val); break; } #else error (_("long long not supported in printf")); #endif case int_arg: { int val = value_as_long (val_args[i]); fprintf_filtered (stream, current_substring, val); break; } case long_arg: { long val = value_as_long (val_args[i]); fprintf_filtered (stream, current_substring, val); break; } /* Handles decimal floating values. */ case decfloat_arg: printf_decfloat (stream, current_substring, val_args[i]); break; case ptr_arg: printf_pointer (stream, current_substring, val_args[i]); 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 printf_filtered and not puts_filtered 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. */ fprintf_filtered (stream, current_substring, 0); break; default: internal_error (__FILE__, __LINE__, _("failed internal consistency check")); } /* Maybe advance to the next argument. */ if (fpieces[fr].argclass != literal_piece) ++i; } } do_cleanups (old_cleanups); } /* Implement the "printf" command. */ static void printf_command (char *arg, int from_tty) { ui_printf (arg, gdb_stdout); gdb_flush (gdb_stdout); } /* Implement the "eval" command. */ static void eval_command (char *arg, int from_tty) { struct ui_file *ui_out = mem_fileopen (); struct cleanup *cleanups = make_cleanup_ui_file_delete (ui_out); char *expanded; ui_printf (arg, ui_out); expanded = ui_file_xstrdup (ui_out, NULL); make_cleanup (xfree, expanded); execute_command (expanded, from_tty); do_cleanups (cleanups); } void _initialize_printcmd (void) { struct cmd_list_element *c; current_display_number = -1; observer_attach_free_objfile (clear_dangling_display_expressions); add_info ("address", address_info, _("Describe where symbol SYM is stored.")); add_info ("symbol", sym_info, _("\ Describe what symbol is at location ADDR.\n\ Only for symbols with fixed locations (global or static scope).")); 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.\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\".")); #if 0 add_com ("whereis", class_vars, whereis_command, _("Print line number and file of definition of variable.")); #endif add_info ("display", display_info, _("\ Expressions to display when program stops, with code numbers.")); add_cmd ("undisplay", class_vars, undisplay_command, _("\ Cancel some expressions to be displayed when program stops.\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); add_com ("display", class_vars, display_command, _("\ Print value of expression EXP each time the program stops.\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.")); add_cmd ("display", class_vars, enable_display_command, _("\ Enable some expressions to be displayed when program stops.\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\ 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\ 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, _("\ printf \"printf format string\", arg1, arg2, arg3, ..., argn\n\ This is useful for formatted output in user-defined commands.")); add_com ("output", class_vars, output_command, _("\ Like \"print\" but don't put in value history and don't print newline.\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, using assignment\n\ syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\ example). 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, "set ", 1, &cmdlist); if (dbx_commands) add_com ("assign", class_vars, set_command, _("\ Evaluate expression EXP and assign result to variable VAR, using assignment\n\ syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\ example). 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\ \nWith a subcommand, this command modifies parts of the gdb environment.\n\ You can see these environment settings with the \"show\" command.")); /* "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\ 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 (c, expression_completer); add_cmd ("variable", class_vars, set_command, _("\ Evaluate expression EXP and assign result to variable VAR, using assignment\n\ syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\ example). 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); c = add_com ("print", class_vars, print_command, _("\ Print value of expression EXP.\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).")); set_cmd_completer (c, expression_completer); add_com_alias ("p", "print", class_vars, 1); add_com_alias ("inspect", "print", 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, _("\ Convert \"printf format string\", arg1, arg2, arg3, ..., argn to\n\ a command line, and call it.")); }