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x86-nat: Use an unordered_map to store per-pid debug reg state.

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This replaces a manual linked list which used O(n) lookup and removal.
This commit is contained in:
John Baldwin
2022-03-22 12:05:43 -07:00
parent 711b0b6698
commit 922c2fc18e
1 changed files with 10 additions and 80 deletions
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90
gdb/x86-nat.c
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@ -22,6 +22,8 @@
#include "gdbcmd.h"
#include "inferior.h"
#include <unordered_map>
/* Support for hardware watchpoints and breakpoints using the x86
debug registers.
@ -36,75 +38,20 @@
/* Low-level function vector. */
struct x86_dr_low_type x86_dr_low;
/* Per-process data. We don't bind this to a per-inferior registry
because of targets like x86 GNU/Linux that need to keep track of
processes that aren't bound to any inferior (e.g., fork children,
checkpoints). */
/* Hash table storing per-process data. We don't bind this to a
per-inferior registry because of targets like x86 GNU/Linux that
need to keep track of processes that aren't bound to any inferior
(e.g., fork children, checkpoints). */
struct x86_process_info
{
/* Linked list. */
struct x86_process_info *next;
/* The process identifier. */
pid_t pid;
/* Copy of x86 hardware debug registers. */
struct x86_debug_reg_state state;
};
static struct x86_process_info *x86_process_list = NULL;
/* Find process data for process PID. */
static struct x86_process_info *
x86_find_process_pid (pid_t pid)
{
struct x86_process_info *proc;
for (proc = x86_process_list; proc; proc = proc->next)
if (proc->pid == pid)
return proc;
return NULL;
}
/* Add process data for process PID. Returns newly allocated info
object. */
static struct x86_process_info *
x86_add_process (pid_t pid)
{
struct x86_process_info *proc = XCNEW (struct x86_process_info);
proc->pid = pid;
proc->next = x86_process_list;
x86_process_list = proc;
return proc;
}
/* Get data specific info for process PID, creating it if necessary.
Never returns NULL. */
static struct x86_process_info *
x86_process_info_get (pid_t pid)
{
struct x86_process_info *proc;
proc = x86_find_process_pid (pid);
if (proc == NULL)
proc = x86_add_process (pid);
return proc;
}
static std::unordered_map<pid_t,
struct x86_debug_reg_state> x86_debug_process_state;
/* Get debug registers state for process PID. */
struct x86_debug_reg_state *
x86_debug_reg_state (pid_t pid)
{
return &x86_process_info_get (pid)->state;
return &x86_debug_process_state[pid];
}
/* See declaration in x86-nat.h. */
@ -112,24 +59,7 @@ x86_debug_reg_state (pid_t pid)
void
x86_forget_process (pid_t pid)
{
struct x86_process_info *proc, **proc_link;
proc = x86_process_list;
proc_link = &x86_process_list;
while (proc != NULL)
{
if (proc->pid == pid)
{
*proc_link = proc->next;
xfree (proc);
return;
}
proc_link = &proc->next;
proc = *proc_link;
}
x86_debug_process_state.erase (pid);
}
/* Clear the reference counts and forget everything we knew about the