mirror of
https://github.com/libretro/bsnes-libretro.git
synced 2024-12-11 02:53:59 +00:00
Added condition breakpoint. Fixed a possible crash when deleting a breakpoint.
This commit is contained in:
Lior Halphon
parent
8eee70aed9
commit
19aea4096b
@ -20,6 +20,11 @@ typedef struct {
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};
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} lvalue_t;
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struct GB_breakpoint_s {
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uint16_t addr;
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char *condition;
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};
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static uint16_t read_lvalue(GB_gameboy_t *gb, lvalue_t lvalue)
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{
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/* Not used until we add support for operators like += */
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@ -438,8 +443,8 @@ static uint16_t find_breakpoint(GB_gameboy_t *gb, uint16_t addr)
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int max = gb->n_breakpoints;
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while (min < max) {
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uint16_t pivot = (min + max) / 2;
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if (gb->breakpoints[pivot] == addr) return pivot;
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if (gb->breakpoints[pivot] > addr) {
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if (gb->breakpoints[pivot].addr == addr) return pivot;
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if (gb->breakpoints[pivot].addr > addr) {
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max = pivot - 1;
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}
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else {
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@ -452,24 +457,55 @@ static uint16_t find_breakpoint(GB_gameboy_t *gb, uint16_t addr)
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static bool breakpoint(GB_gameboy_t *gb, char *arguments)
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{
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if (strlen(lstrip(arguments)) == 0) {
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GB_log(gb, "Usage: breakpoint <expression>\n");
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GB_log(gb, "Usage: breakpoint <expression>[ if <condition expression>]\n");
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return true;
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}
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char *condition = NULL;
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if ((condition = strstr(arguments, " if "))) {
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*condition = 0;
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condition += strlen(" if ");
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/* Verify condition is sane (Todo: This might have side effects!) */
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bool error;
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debugger_evaluate(gb, arguments, (unsigned int)strlen(arguments), &error);
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if (error) return true;
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}
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bool error;
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uint16_t result = debugger_evaluate(gb, arguments, (unsigned int)strlen(arguments), &error);
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if (error) return true;
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uint16_t index = find_breakpoint(gb, result);
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if (index < gb->n_breakpoints && gb->breakpoints[index] == result) {
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if (index < gb->n_breakpoints && gb->breakpoints[index].addr == result) {
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GB_log(gb, "Breakpoint already set at %04x\n", result);
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if (!gb->breakpoints[index].condition && condition) {
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GB_log(gb, "Added condition to breakpoint\n");
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gb->breakpoints[index].condition = strdup(condition);
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}
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else if (gb->breakpoints[index].condition && condition) {
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GB_log(gb, "Replaced breakpoint condition\n");
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free(gb->breakpoints[index].condition);
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gb->breakpoints[index].condition = strdup(condition);
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}
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else if (gb->breakpoints[index].condition && !condition) {
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GB_log(gb, "Removed breakpoint condition\n");
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free(gb->breakpoints[index].condition);
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gb->breakpoints[index].condition = NULL;
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}
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return true;
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}
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gb->breakpoints = realloc(gb->breakpoints, (gb->n_breakpoints + 1) * sizeof(gb->breakpoints[0]));
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memmove(&gb->breakpoints[index + 1], &gb->breakpoints[index], (gb->n_breakpoints - index) * sizeof(gb->breakpoints[0]));
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gb->breakpoints[index] = result;
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gb->breakpoints[index].addr = result;
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if (condition) {
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gb->breakpoints[index].condition = strdup(condition);
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}
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else {
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gb->breakpoints[index].condition = NULL;
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}
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gb->n_breakpoints++;
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GB_log(gb, "Breakpoint set at %04x\n", result);
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@ -482,6 +518,11 @@ static bool delete(GB_gameboy_t *gb, char *arguments)
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GB_log(gb, "Delete all breakpoints? ");
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char *answer = gb->input_callback(gb);
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if (answer[0] == 'Y' || answer[0] == 'y') {
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for (unsigned i = gb->n_breakpoints; i--;) {
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if (gb->breakpoints[i].condition) {
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free(gb->breakpoints[i].condition);
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}
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}
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free(gb->breakpoints);
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gb->breakpoints = NULL;
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gb->n_breakpoints = 0;
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@ -495,12 +536,16 @@ static bool delete(GB_gameboy_t *gb, char *arguments)
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if (error) return true;
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uint16_t index = find_breakpoint(gb, result);
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if (index >= gb->n_breakpoints || gb->breakpoints[index] != result) {
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if (index >= gb->n_breakpoints || gb->breakpoints[index].addr != result) {
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GB_log(gb, "No breakpoint set at %04x\n", result);
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return true;
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}
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memmove(&gb->breakpoints[index], &gb->breakpoints[index + 1], (gb->n_breakpoints - index) * sizeof(gb->breakpoints[0]));
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if (gb->breakpoints[index].condition) {
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free(gb->breakpoints[index].condition);
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}
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memmove(&gb->breakpoints[index], &gb->breakpoints[index + 1], (gb->n_breakpoints - index - 1) * sizeof(gb->breakpoints[0]));
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gb->n_breakpoints--;
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gb->breakpoints = realloc(gb->breakpoints, gb->n_breakpoints * sizeof(gb->breakpoints[0]));
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@ -522,7 +567,12 @@ static bool list(GB_gameboy_t *gb, char *arguments)
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GB_log(gb, "%d breakpoint(s) set:\n", gb->n_breakpoints);
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for (uint16_t i = 0; i < gb->n_breakpoints; i++) {
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GB_log(gb, " %d. %04x\n", i + 1, gb->breakpoints[i]);
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if (gb->breakpoints[i].condition) {
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GB_log(gb, " %d. %04x (Condition: %s)\n", i + 1, gb->breakpoints[i].addr, gb->breakpoints[i].condition);
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}
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else {
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GB_log(gb, " %d. %04x\n", i + 1, gb->breakpoints[i].addr);
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}
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}
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return true;
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@ -531,9 +581,20 @@ static bool list(GB_gameboy_t *gb, char *arguments)
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static bool should_break(GB_gameboy_t *gb, uint16_t addr)
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{
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uint16_t index = find_breakpoint(gb, addr);
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if (index < gb->n_breakpoints && gb->breakpoints[index] == addr) {
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if (index < gb->n_breakpoints && gb->breakpoints[index].addr == addr) {
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if (!gb->breakpoints[index].condition) {
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return true;
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}
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bool error;
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bool condition = debugger_evaluate(gb, gb->breakpoints[index].condition,
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(unsigned int)strlen(gb->breakpoints[index].condition), &error);
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if (error) {
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/* Should never happen */
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GB_log(gb, "An internal error has occured\n");
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return true;
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}
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return condition;
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}
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return false;
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}
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@ -611,7 +672,6 @@ static bool mbc(GB_gameboy_t *gb, char *arguments)
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GB_log(gb, "Cart contains a real time clock\n");
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}
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return true;
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}
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@ -625,7 +685,7 @@ static const debugger_command_t commands[] = {
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{"registers", 1, registers, "Print values of processor registers and other important registers"},
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{"cartridge", 2, mbc, "Displays information about the MBC and cartridge"},
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{"mbc", 3, mbc, NULL},
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{"breakpoint", 1, breakpoint, "Add a new breakpoint at the specified address/expression"},
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{"breakpoint", 1, breakpoint, "Add a new breakpoint at the specified address/expression. Can also modify the condition of existing breakpoints."},
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{"list", 1, list, "List all set breakpoints"},
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{"delete", 2, delete, "Delete a breakpoint by its address, or all breakpoints"},
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{"print", 1, print, "Evaluate and print an expression"},
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@ -180,6 +180,8 @@ typedef struct {
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/* Todo: We might want to typedef our own bool if this prevents SameBoy from working on specific platforms. */
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_Static_assert(sizeof(bool) == 1, "sizeof(bool) != 1");
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struct GB_breakpoint_s;
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typedef struct GB_gameboy_s {
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GB_SECTION(header,
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/* The magic makes sure a state file is:
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@ -315,7 +317,7 @@ typedef struct GB_gameboy_s {
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int debug_call_depth;
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bool debug_fin_command, debug_next_command;
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uint16_t n_breakpoints;
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uint16_t *breakpoints;
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struct GB_breakpoint_s *breakpoints;
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bool stack_leak_detection;
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uint16_t sp_for_call_depth[0x200]; /* Should be much more than enough */
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uint16_t addr_for_call_depth[0x200];
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