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winedbg: Refactor gdb_context::out_{buf*,len} into reply_buffer. 

This is required for a subsequent patch that adds buffering for
GDB qXfer reply data.

Signed-off-by: Jinoh Kang <jinoh.kang.kr@gmail.com>
Signed-off-by: Rémi Bernon <rbernon@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Jinoh Kang 2021-11-24 00:09:48 +09:00 committed by Alexandre Julliard
parent 9082518465
commit 9b29182ca7
1 changed files with 80 additions and 54 deletions
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134
programs/winedbg/gdbproxy.c
View File

@ -54,6 +54,13 @@ struct gdb_xpoint
unsigned int value;
};
struct reply_buffer
{
unsigned char* base;
size_t len;
size_t alloc;
};
struct gdb_context
{
/* gdb information */
@ -66,9 +73,7 @@ struct gdb_context
char* in_packet;
int in_packet_len;
/* outgoing buffer */
char* out_buf;
int out_buf_alloc;
int out_len;
struct reply_buffer out_buf;
int out_curr_packet;
/* generic GDB thread information */
int exec_tid; /* tid used in step & continue */
@ -224,12 +229,57 @@ static void hex_to(char* dst, const void* src, size_t len)
}
}
static unsigned char checksum(const char* ptr, int len)
static void reply_buffer_clear(struct reply_buffer* reply)
{
reply->len = 0;
}
static void reply_buffer_grow(struct reply_buffer* reply, size_t size)
{
if (reply->alloc < reply->len + size)
{
reply->alloc = ((reply->len + size) / 32 + 1) * 32;
reply->base = realloc(reply->base, reply->alloc);
}
}
static void reply_buffer_append(struct reply_buffer* reply, const void* data, size_t size)
{
reply_buffer_grow(reply, size);
memcpy(reply->base + reply->len, data, size);
reply->len += size;
}
static inline void reply_buffer_append_hex(struct reply_buffer* reply, const void* src, size_t len)
{
reply_buffer_grow(reply, len * 2);
hex_to((char *)reply->base + reply->len, src, len);
reply->len += len * 2;
}
static inline void reply_buffer_append_uinthex(struct reply_buffer* reply, ULONG_PTR val, int len)
{
char buf[sizeof(ULONG_PTR) * 2], *ptr;
assert(len <= sizeof(ULONG_PTR));
ptr = buf + len * 2;
while (ptr != buf)
{
*--ptr = hex_to0(val & 0x0F);
val >>= 4;
}
reply_buffer_append(reply, ptr, len * 2);
}
static unsigned char checksum(const void* data, int len)
{
unsigned cksum = 0;
const unsigned char* ptr = data;
while (len-- > 0)
cksum += (unsigned char)*ptr++;
cksum += *ptr++;
return cksum;
}
@ -705,20 +755,9 @@ static int addr_width(struct gdb_context* gdbctx)
enum packet_return {packet_error = 0x00, packet_ok = 0x01, packet_done = 0x02,
packet_last_f = 0x80};
static void packet_reply_grow(struct gdb_context* gdbctx, size_t size)
{
if (gdbctx->out_buf_alloc < gdbctx->out_len + size)
{
gdbctx->out_buf_alloc = ((gdbctx->out_len + size) / 32 + 1) * 32;
gdbctx->out_buf = realloc(gdbctx->out_buf, gdbctx->out_buf_alloc);
}
}
static void packet_reply_hex_to(struct gdb_context* gdbctx, const void* src, int len)
{
packet_reply_grow(gdbctx, len * 2);
hex_to(&gdbctx->out_buf[gdbctx->out_len], src, len);
gdbctx->out_len += len * 2;
reply_buffer_append_hex(&gdbctx->out_buf, src, len);
}
static inline void packet_reply_hex_to_str(struct gdb_context* gdbctx, const char* src)
@ -728,15 +767,7 @@ static inline void packet_reply_hex_to_str(struct gdb_context* gdbctx, const cha
static void packet_reply_val(struct gdb_context* gdbctx, ULONG_PTR val, int len)
{
int i, shift;
shift = (len - 1) * 8;
packet_reply_grow(gdbctx, len * 2);
for (i = 0; i < len; i++, shift -= 8)
{
gdbctx->out_buf[gdbctx->out_len++] = hex_to0((val >> (shift + 4)) & 0x0F);
gdbctx->out_buf[gdbctx->out_len++] = hex_to0((val >> shift ) & 0x0F);
}
reply_buffer_append_uinthex(&gdbctx->out_buf, val, len);
}
static const unsigned char gdb_special_chars_lookup_table[4] = {
@ -764,6 +795,7 @@ static inline BOOL is_gdb_special_char(unsigned char val)
static void packet_reply_add(struct gdb_context* gdbctx, const char* str)
{
const unsigned char *ptr = (unsigned char *)str, *curr;
unsigned char esc_seq[2];
while (*ptr)
{
@ -772,23 +804,20 @@ static void packet_reply_add(struct gdb_context* gdbctx, const char* str)
while (*ptr && !is_gdb_special_char(*ptr))
ptr++;
packet_reply_grow(gdbctx, ptr - curr);
memcpy(&gdbctx->out_buf[gdbctx->out_len], curr, ptr - curr);
gdbctx->out_len += ptr - curr;
reply_buffer_append(&gdbctx->out_buf, curr, ptr - curr);
if (!*ptr) break;
packet_reply_grow(gdbctx, 2);
gdbctx->out_buf[gdbctx->out_len++] = 0x7D;
gdbctx->out_buf[gdbctx->out_len++] = 0x20 ^ *ptr++;
esc_seq[0] = 0x7D;
esc_seq[1] = 0x20 ^ *ptr++;
reply_buffer_append(&gdbctx->out_buf, esc_seq, 2);
}
}
static void packet_reply_open(struct gdb_context* gdbctx)
{
assert(gdbctx->out_curr_packet == -1);
packet_reply_grow(gdbctx, 1);
gdbctx->out_buf[gdbctx->out_len++] = '$';
gdbctx->out_curr_packet = gdbctx->out_len;
reply_buffer_append(&gdbctx->out_buf, "$", 1);
gdbctx->out_curr_packet = gdbctx->out_buf.len;
}
static void packet_reply_close(struct gdb_context* gdbctx)
@ -796,10 +825,9 @@ static void packet_reply_close(struct gdb_context* gdbctx)
unsigned char cksum;
int plen;
plen = gdbctx->out_len - gdbctx->out_curr_packet;
packet_reply_grow(gdbctx, 1);
gdbctx->out_buf[gdbctx->out_len++] = '#';
cksum = checksum(&gdbctx->out_buf[gdbctx->out_curr_packet], plen);
plen = gdbctx->out_buf.len - gdbctx->out_curr_packet;
reply_buffer_append(&gdbctx->out_buf, "#", 1);
cksum = checksum(gdbctx->out_buf.base + gdbctx->out_curr_packet, plen);
packet_reply_hex_to(gdbctx, &cksum, 1);
gdbctx->out_curr_packet = -1;
}
@ -815,20 +843,20 @@ static void packet_reply_close_xfer(struct gdb_context* gdbctx, unsigned int off
int begin = gdbctx->out_curr_packet + 1;
int plen;
if (begin + off < gdbctx->out_len)
if (begin + off < gdbctx->out_buf.len)
{
gdbctx->out_len -= off;
memmove(gdbctx->out_buf + begin, gdbctx->out_buf + begin + off, gdbctx->out_len);
gdbctx->out_buf.len -= off;
memmove(gdbctx->out_buf.base + begin, gdbctx->out_buf.base + begin + off, gdbctx->out_buf.len);
}
else
{
gdbctx->out_buf[gdbctx->out_curr_packet] = 'l';
gdbctx->out_len = gdbctx->out_curr_packet + 1;
gdbctx->out_buf.base[gdbctx->out_curr_packet] = 'l';
gdbctx->out_buf.len = gdbctx->out_curr_packet + 1;
}
plen = gdbctx->out_len - begin;
if (plen > len) gdbctx->out_len -= (plen - len);
else gdbctx->out_buf[gdbctx->out_curr_packet] = 'l';
plen = gdbctx->out_buf.len - begin;
if (plen > len) gdbctx->out_buf.len -= (plen - len);
else gdbctx->out_buf.base[gdbctx->out_curr_packet] = 'l';
packet_reply_close(gdbctx);
}
@ -2098,10 +2126,10 @@ static BOOL extract_packets(struct gdb_context* gdbctx)
case packet_done: break;
}
TRACE("Reply: %s\n", debugstr_an(gdbctx->out_buf, gdbctx->out_len));
i = send(gdbctx->sock, gdbctx->out_buf, gdbctx->out_len, 0);
assert(i == gdbctx->out_len);
gdbctx->out_len = 0;
TRACE("Reply: %s\n", debugstr_an((char *)gdbctx->out_buf.base, gdbctx->out_buf.len));
i = send(gdbctx->sock, (char *)gdbctx->out_buf.base, gdbctx->out_buf.len, 0);
assert(i == gdbctx->out_buf.len);
reply_buffer_clear(&gdbctx->out_buf);
}
else
WARN("Ignoring: %s (checksum: %d != %d)\n", debugstr_an(ptr, sum - ptr),
@ -2255,9 +2283,7 @@ static BOOL gdb_init_context(struct gdb_context* gdbctx, unsigned flags, unsigne
gdbctx->in_buf = NULL;
gdbctx->in_buf_alloc = 0;
gdbctx->in_len = 0;
gdbctx->out_buf = NULL;
gdbctx->out_buf_alloc = 0;
gdbctx->out_len = 0;
memset(&gdbctx->out_buf, 0, sizeof(gdbctx->out_buf));
gdbctx->out_curr_packet = -1;
gdbctx->exec_tid = -1;