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/* |
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* Copyright (C) 2004-2007 Anders Gavare. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* |
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* $Id: debugger_expr.c,v 1.10 2006/12/30 13:30:56 debug Exp $ |
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* |
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* Expression evaluator. |
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* |
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* |
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* TODO: |
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* Sign-extension only on MIPS? |
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* SPECIAL IMPORTANT CASE: Clear the delay_slot flag when writing |
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* to the pc register. |
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* TAB completion? :-) |
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*/ |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <ctype.h> |
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|
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#include "cpu.h" |
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#include "debugger.h" |
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#include "machine.h" |
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#include "misc.h" |
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#include "settings.h" |
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|
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|
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extern struct settings *global_settings; |
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|
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extern int debugger_cur_cpu; |
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extern int debugger_cur_machine; |
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extern int debugger_cur_emul; |
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|
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|
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/* |
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* debugger_parse_name(): |
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* |
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* This function takes a string as input, and tries to match it to a register |
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* name or a more general "setting", a hexadecimal or decimal numeric value, |
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* or a registered symbol. |
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* |
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* Some examples: |
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* |
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* Settings (including register names): |
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* verbose |
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* pc |
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* r5 |
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* |
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* Numeric values: |
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* 12345 |
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* 0x7fff1234 |
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* |
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* Symbols: |
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* memcpy |
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* |
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* To force detection of different types, a character can be added in front of |
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* the name: "$" for numeric values, "#" for registers or other settings, |
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* and "@" for symbols. |
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* |
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* Return value is: |
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* |
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* PARSE_NOMATCH no match |
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* PARSE_MULTIPLE multiple matches |
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* |
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* or one of these (and then *valuep is read or written, depending on |
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* the writeflag): |
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* |
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* PARSE_SETTINGS a setting (e.g. a register) |
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* PARSE_NUMBER a hex number |
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* PARSE_SYMBOL a symbol |
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*/ |
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int debugger_parse_name(struct machine *m, char *name, int writeflag, |
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uint64_t *valuep) |
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{ |
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int match_settings = 0, match_symbol = 0, match_numeric = 0; |
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int skip_settings, skip_numeric, skip_symbol; |
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|
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if (m == NULL || name == NULL) { |
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fprintf(stderr, "debugger_parse_name(): NULL ptr\n"); |
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exit(1); |
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} |
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|
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while (name[0] == '\t' || name[0] == ' ') |
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name ++; |
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|
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/* Warn about non-signextended values: */ |
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if (writeflag) { |
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if (m->cpus[0]->is_32bit) { |
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/* Automagically sign-extend. TODO: Is this good? */ |
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if (((*valuep) >> 32) == 0 && (*valuep) & 0x80000000ULL) |
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(*valuep) |= 0xffffffff00000000ULL; |
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} else { |
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if (((*valuep) >> 32) == 0 && (*valuep) & 0x80000000ULL) |
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printf("WARNING: The value is not sign-extende" |
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"d. Is this what you intended?\n"); |
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} |
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} |
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|
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skip_settings = name[0] == '$' || name[0] == '@'; |
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skip_numeric = name[0] == '#' || name[0] == '@'; |
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skip_symbol = name[0] == '$' || name[0] == '#'; |
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|
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if (!skip_settings) { |
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char setting_name[400]; |
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int res; |
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|
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res = settings_access(global_settings, name, writeflag, valuep); |
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if (res == SETTINGS_OK) |
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match_settings = 1; |
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|
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if (!match_settings) { |
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snprintf(setting_name, sizeof(setting_name), |
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GLOBAL_SETTINGS_NAME".%s", name); |
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res = settings_access(global_settings, setting_name, |
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writeflag, valuep); |
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if (res == SETTINGS_OK) |
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match_settings = 1; |
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} |
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|
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if (!match_settings) { |
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snprintf(setting_name, sizeof(setting_name), |
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GLOBAL_SETTINGS_NAME".emul[%i].%s", |
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debugger_cur_emul, name); |
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res = settings_access(global_settings, setting_name, |
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writeflag, valuep); |
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if (res == SETTINGS_OK) |
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match_settings = 1; |
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} |
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|
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if (!match_settings) { |
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snprintf(setting_name, sizeof(setting_name), |
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GLOBAL_SETTINGS_NAME".emul[%i].machine[%i].%s", |
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debugger_cur_emul, debugger_cur_machine, name); |
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res = settings_access(global_settings, setting_name, |
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writeflag, valuep); |
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if (res == SETTINGS_OK) |
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match_settings = 1; |
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} |
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|
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if (!match_settings) { |
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snprintf(setting_name, sizeof(setting_name), |
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GLOBAL_SETTINGS_NAME".emul[%i].machine[%i]." |
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"cpu[%i].%s", debugger_cur_emul, |
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debugger_cur_machine, debugger_cur_cpu, name); |
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res = settings_access(global_settings, setting_name, |
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writeflag, valuep); |
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if (res == SETTINGS_OK) |
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match_settings = 1; |
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} |
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} |
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|
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/* Check for a number match: */ |
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if (!skip_numeric && isdigit((int)name[0])) { |
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uint64_t x; |
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x = strtoull(name, NULL, 0); |
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if (writeflag) |
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printf("You cannot assign like that.\n"); |
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else |
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*valuep = x; |
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match_numeric = 1; |
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} |
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|
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/* Check for a symbol match: */ |
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if (!skip_symbol) { |
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uint64_t newaddr; |
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if (get_symbol_addr(&m->symbol_context, name, &newaddr)) { |
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if (writeflag) |
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printf("You cannot assign like that.\n"); |
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else |
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*valuep = newaddr; |
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match_symbol = 1; |
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} |
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} |
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|
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if (match_settings + match_symbol + match_numeric > 1) |
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return PARSE_MULTIPLE; |
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|
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if (match_settings) |
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return PARSE_SETTINGS; |
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if (match_numeric) |
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return PARSE_NUMBER; |
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if (match_symbol) |
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return PARSE_SYMBOL; |
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|
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return PARSE_NOMATCH; |
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} |
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|
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|
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/* |
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* debugger_parse_expression() |
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* |
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* Input: |
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* writeflag = 0: expr = an expression to evaluate. The result is |
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* returned in *valuep. |
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* |
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* writeflag = 1: expr = an lvalue name. *valuep is written to that |
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* lvalue, using debugger_parse_name(). |
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* |
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* Parentheses always have precedence. |
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* * / and % have second highest precedence. |
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* + - & | ^ have lowest precedence. |
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* |
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* Return value on failure is: |
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* |
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* PARSE_NOMATCH one or more words in the expression didn't |
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* match any known symbol/register/number |
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* PARSE_MULTIPLE multiple matches within the expression |
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* |
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* Return value on success is PARSE_NUMBER (for now). |
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* |
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* |
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* TODO: BETTER RETURN VALUE! |
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* |
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* NOTE: This is a quick hack, but hopefully it should work. The internal |
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* mechanism is to split the expression into a left half and a right |
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* half around an operator. This operator should be the operator |
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* in the string which has the lowest precedence (except those that |
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* are inside parentheses sub-expressions). E.g. if the expression |
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* is a * (b + c * d) / e then the operator with the lowest |
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* precedence is the first multiplication sign, and the split will |
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* be: left = a |
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* right = (b+c*d)/e |
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*/ |
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int debugger_parse_expression(struct machine *m, char *expr, int writeflag, |
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uint64_t *valuep) |
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{ |
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int prec, res, i, nest; |
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char *copy; |
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|
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if (writeflag) |
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return debugger_parse_name(m, expr, writeflag, valuep); |
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|
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while (expr[0] == '\t' || expr[0] == ' ') |
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expr ++; |
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|
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copy = strdup(expr); |
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if (copy == NULL) { |
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fprintf(stderr, "debugger_parse_expression(): out of memory\n"); |
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exit(1); |
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} |
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|
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while (copy[0] && copy[strlen(copy)-1] == ' ') |
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copy[strlen(copy)-1] = '\0'; |
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|
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/* Find the lowest operator precedence: */ |
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i = 0; prec = 2; nest = 0; |
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while (copy[i] != '\0') { |
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switch (copy[i]) { |
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case '(': |
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nest ++; |
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break; |
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case ')': |
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nest --; |
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break; |
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case '+': |
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case '-': |
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case '^': |
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case '&': |
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case '|': |
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if (nest == 0) |
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prec = 0; |
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break; |
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case '*': |
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case '/': |
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case '%': |
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if (nest == 0 && prec > 1) |
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prec = 1; |
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break; |
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} |
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|
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i++; |
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} |
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|
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if (nest != 0) { |
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printf("Unmatching parentheses.\n"); |
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return PARSE_NOMATCH; |
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} |
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|
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if (prec == 2 && copy[0] == '(' && copy[strlen(copy)-1] == ')') { |
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int res; |
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copy[strlen(copy)-1] = '\0'; |
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res = debugger_parse_expression(m, copy+1, 0, valuep); |
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free(copy); |
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return res; |
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} |
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|
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/* Split according to the first lowest priority operator: */ |
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i = 0; nest = 0; |
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while (copy[i] != '\0') { |
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switch (copy[i]) { |
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case '(': |
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nest ++; |
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break; |
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case ')': |
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nest --; |
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break; |
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case '*': |
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case '/': |
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case '%': |
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if (prec == 0) |
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break; |
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/* Fallthrough. */ |
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case '+': |
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case '-': |
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case '^': |
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case '&': |
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case '|': |
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if (nest == 0) { |
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uint64_t left, right; |
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int res1, res2, j; |
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char op = copy[i]; |
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|
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copy[i] = '\0'; |
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j = i; |
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while (j>0 && copy[j-1] == ' ') { |
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copy[j-1] = '\0'; |
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j --; |
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} |
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|
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res1 = debugger_parse_expression( |
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m, copy, 0, &left); |
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res2 = debugger_parse_expression( |
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m, copy + i + 1, 0, &right); |
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|
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if (res1 == PARSE_NOMATCH || |
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res2 == PARSE_NOMATCH) { |
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res = PARSE_NOMATCH; |
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goto return_failure; |
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} |
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|
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if (res1 == PARSE_MULTIPLE || |
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res2 == PARSE_MULTIPLE) { |
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res = PARSE_MULTIPLE; |
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goto return_failure; |
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} |
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|
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switch (op) { |
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case '+': |
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(*valuep) = left + right; |
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break; |
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case '-': |
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(*valuep) = left - right; |
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break; |
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case '^': |
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(*valuep) = left ^ right; |
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break; |
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case '&': |
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(*valuep) = left & right; |
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break; |
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case '|': |
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(*valuep) = left | right; |
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break; |
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case '*': |
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(*valuep) = left * right; |
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break; |
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case '/': |
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(*valuep) = left / right; |
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break; |
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case '%': |
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(*valuep) = left % right; |
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break; |
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} |
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|
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goto return_ok; |
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} |
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break; |
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} |
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|
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i ++; |
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} |
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|
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res = debugger_parse_name(m, expr, writeflag, valuep); |
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if (res == PARSE_NOMATCH || res == PARSE_MULTIPLE) |
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goto return_failure; |
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|
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return_ok: |
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free(copy); |
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return PARSE_NUMBER; |
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|
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return_failure: |
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free(copy); |
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return res; |
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} |
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|