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#if HAVE_CONFIG_H
#include "config.h"
#endif
#include "ltrace.h"
#include "options.h"
#include "output.h"
#include <stdlib.h>
#include <assert.h>
/*****************************************************************************/
/*
Dictionary code done by Morten Eriksen <mortene@sim.no>.
FIXME: should we merge with dictionary code in demangle.c? 19990704 mortene.
*/
struct dict_entry {
struct process * proc;
struct breakpoint brk; /* addr field of struct is the hash key. */
struct dict_entry * next;
};
#define DICTTABLESIZE 997 /* Semi-randomly selected prime number. */
static struct dict_entry * dict_buckets[DICTTABLESIZE];
static int dict_initialized = 0;
static void dict_init(void);
static void dict_clear(void);
static struct breakpoint * dict_enter(struct process * proc, void * brkaddr);
static struct breakpoint * dict_find_entry(struct process * proc, void * brkaddr);
static void dict_apply_to_all(void (* func)(struct process *, struct breakpoint *, void * data), void * data);
static void
dict_init(void) {
int i;
/* FIXME: is this necessary? Check with ANSI C spec. 19990702 mortene. */
for (i = 0; i < DICTTABLESIZE; i++) dict_buckets[i] = NULL;
dict_initialized = 1;
}
static void
dict_clear(void) {
int i;
struct dict_entry * entry, * nextentry;
for (i = 0; i < DICTTABLESIZE; i++) {
for (entry = dict_buckets[i]; entry != NULL; entry = nextentry) {
nextentry = entry->next;
free(entry);
}
dict_buckets[i] = NULL;
}
}
static struct breakpoint *
dict_enter(struct process * proc, void * brkaddr) {
struct dict_entry * entry, * newentry;
unsigned int bucketpos = ((unsigned long int)brkaddr) % DICTTABLESIZE;
newentry = malloc(sizeof(struct dict_entry));
if (!newentry) {
perror("malloc");
return NULL;
}
newentry->proc = proc;
newentry->brk.addr = brkaddr;
newentry->brk.enabled = 0;
newentry->next = NULL;
entry = dict_buckets[bucketpos];
while (entry && entry->next) entry = entry->next;
if (entry) entry->next = newentry;
else dict_buckets[bucketpos] = newentry;
if (opt_d > 2)
output_line(0, "new brk dict entry at %p\n", brkaddr);
return &(newentry->brk);
}
static struct breakpoint *
dict_find_entry(struct process * proc, void * brkaddr) {
unsigned int bucketpos = ((unsigned long int)brkaddr) % DICTTABLESIZE;
struct dict_entry * entry = dict_buckets[bucketpos];
while (entry) {
if ((entry->brk.addr == brkaddr) && (entry->proc == proc)) break;
entry = entry->next;
}
return entry ? &(entry->brk) : NULL;
}
static void
dict_apply_to_all(void (* func)(struct process *, struct breakpoint *, void * data), void * data) {
int i;
for (i = 0; i < DICTTABLESIZE; i++) {
struct dict_entry * entry = dict_buckets[i];
while (entry) {
func(entry->proc, &(entry->brk), data);
entry = entry->next;
}
}
}
#undef DICTTABLESIZE
/*****************************************************************************/
struct breakpoint *
address2bpstruct(struct process * proc, void * addr) {
return dict_find_entry(proc, addr);
}
void
insert_breakpoint(struct process * proc, void * addr) {
struct breakpoint * sbp;
if (!dict_initialized) {
dict_init();
atexit(dict_clear);
}
sbp = dict_find_entry(proc, addr);
if (!sbp) sbp = dict_enter(proc, addr);
if (!sbp) return;
sbp->enabled++;
if (sbp->enabled==1 && proc->pid) enable_breakpoint(proc->pid, sbp);
}
void
delete_breakpoint(struct process * proc, void * addr) {
struct breakpoint * sbp = dict_find_entry(proc, addr);
assert(sbp); /* FIXME: remove after debugging has been done. */
/* This should only happen on out-of-memory conditions. */
if (sbp == NULL) return;
sbp->enabled--;
if (sbp->enabled == 0) disable_breakpoint(proc->pid, sbp);
assert(sbp->enabled >= 0);
}
static void
enable_bp_cb(struct process * proc, struct breakpoint * sbp, void * data) {
struct process * myproc = (struct process *)data;
if (myproc == proc && sbp->enabled) enable_breakpoint(proc->pid, sbp);
}
void
enable_all_breakpoints(struct process * proc) {
if (proc->breakpoints_enabled <= 0) {
if (opt_d>0) {
output_line(0, "Enabling breakpoints for pid %u...", proc->pid);
}
dict_apply_to_all(enable_bp_cb, proc);
}
proc->breakpoints_enabled = 1;
}
static void
disable_bp_cb(struct process * proc, struct breakpoint * sbp, void * data) {
struct process * myproc = (struct process *)data;
if (myproc == proc && sbp->enabled) disable_breakpoint(proc->pid, sbp);
}
void
disable_all_breakpoints(struct process * proc) {
if (proc->breakpoints_enabled) {
if (opt_d>0) {
output_line(0, "Disabling breakpoints for pid %u...", proc->pid);
}
dict_apply_to_all(disable_bp_cb, proc);
}
proc->breakpoints_enabled = 0;
}
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