Commit 28ac17f4 authored by Nick Mathewson's avatar Nick Mathewson 🎨
Browse files

Use __attribute__((fallthrough)) rather than magic GCC comments.

GCC added an implicit-fallthrough warning a while back, where it
would complain if you had a nontrivial "case:" block that didn't end
with break, return, or something like that.  Clang recently added
the same thing.

GCC, however, would let you annotate a fall-through as intended by
any of various magic "/* fall through */" comments.  Clang, however,
only seems to like "__attribute__((fallthrough))".  Fortunately, GCC
accepts that too.

A previous commit in this branch defined a FALLTHROUGH macro to do
the right thing if GNUC is defined; here we replace all of our "fall
through" comments with uses of that macro.

This is an automated commit, made with the following perl one-liner:

  #!/usr/bin/perl -i -p
  s#/\* *falls? ?thr.*?\*/#FALLTHROUGH;#i;

(In order to avoid conflicts, I'm applying this script separately to
each maint branch. This is the 0.4.2 version.)
parent f954514b
......@@ -1237,7 +1237,7 @@ channel_tls_handle_var_cell(var_cell_t *var_cell, or_connection_t *conn)
/* But that should be happening any longer've disabled bufferevents. */
tor_assert_nonfatal_unreached_once();
/* fall through */
FALLTHROUGH;
case OR_CONN_STATE_TLS_SERVER_RENEGOTIATING:
if (!(command_allowed_before_handshake(var_cell->command))) {
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
......
......@@ -2108,7 +2108,7 @@ choose_good_exit_server(origin_circuit_t *circ,
/* For these three, we want to pick the exit like a middle hop,
* since it should be random. */
tor_assert_nonfatal(is_internal);
/* Falls through */
FALLTHROUGH;
case CIRCUIT_PURPOSE_C_GENERAL:
if (is_internal) /* pick it like a middle hop */
return router_choose_random_node(NULL, options->ExcludeNodes, flags);
......
......@@ -844,7 +844,7 @@ circuit_purpose_to_controller_hs_state_string(uint8_t purpose)
"Unrecognized circuit purpose: %d",
(int)purpose);
tor_fragile_assert();
/* fall through */
FALLTHROUGH;
case CIRCUIT_PURPOSE_OR:
case CIRCUIT_PURPOSE_C_GENERAL:
......
......@@ -784,7 +784,7 @@ circuit_expire_building(void)
TO_ORIGIN_CIRCUIT(victim)->build_state->pending_final_cpath ==
NULL)
break;
/* fallthrough! */
FALLTHROUGH;
case CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT:
case CIRCUIT_PURPOSE_C_REND_READY_INTRO_ACKED:
/* If we have reached this line, we want to spare the circ for now. */
......
......@@ -307,7 +307,7 @@ connection_edge_process_inbuf(edge_connection_t *conn, int package_partial)
note_user_activity(approx_time());
}
/* falls through. */
FALLTHROUGH;
case EXIT_CONN_STATE_OPEN:
if (connection_edge_package_raw_inbuf(conn, package_partial, NULL) < 0) {
/* (We already sent an end cell if possible) */
......@@ -332,7 +332,7 @@ connection_edge_process_inbuf(edge_connection_t *conn, int package_partial)
}
/* Fall through if the connection is on a circuit without optimistic
* data support. */
/* Falls through. */
FALLTHROUGH;
case EXIT_CONN_STATE_CONNECTING:
case AP_CONN_STATE_RENDDESC_WAIT:
case AP_CONN_STATE_CIRCUIT_WAIT:
......@@ -766,7 +766,7 @@ connection_edge_flushed_some(edge_connection_t *conn)
note_user_activity(approx_time());
}
/* falls through. */
FALLTHROUGH;
case EXIT_CONN_STATE_OPEN:
sendme_connection_edge_consider_sending(conn);
break;
......
......@@ -113,7 +113,7 @@ cpath_assert_layer_ok(const crypt_path_t *cp)
{
case CPATH_STATE_OPEN:
relay_crypto_assert_ok(&cp->pvt_crypto);
/* fall through */
FALLTHROUGH;
case CPATH_STATE_CLOSED:
/*XXXX Assert that there's no handshake_state either. */
tor_assert(!cp->rend_dh_handshake_state);
......
......@@ -509,7 +509,7 @@ create_cell_format_impl(cell_t *cell_out, const create_cell_t *cell_in,
p += 16;
space -= 16;
}
/* Fall through */
FALLTHROUGH;
case CELL_CREATE_FAST:
tor_assert(cell_in->handshake_len <= space);
memcpy(p, cell_in->onionskin, cell_in->handshake_len);
......
......@@ -2842,7 +2842,7 @@ parse_short_policy(const char *summary)
switch (*next) {
case ',':
++next;
/* fall through */
FALLTHROUGH;
case '\0':
high = low;
break;
......
......@@ -489,7 +489,7 @@ end_reason_to_http_connect_response_line(int endreason)
return "HTTP/1.0 502 Bad Gateway (tor protocol violation)\r\n\r\n";
case END_STREAM_REASON_ENTRYPOLICY:
return "HTTP/1.0 403 Forbidden (entry policy violation)\r\n\r\n";
case END_STREAM_REASON_NOTDIRECTORY: /* Fall Through */
case END_STREAM_REASON_NOTDIRECTORY: FALLTHROUGH;
default:
tor_assert_nonfatal_unreached();
return "HTTP/1.0 500 Internal Server Error (weird end reason)\r\n\r\n";
......
......@@ -940,7 +940,7 @@ connection_ap_process_end_not_open(
break; /* break means it'll close, below */
/* Else fall through: expire this circuit, clear the
* chosen_exit_name field, and try again. */
/* Falls through. */
FALLTHROUGH;
case END_STREAM_REASON_RESOLVEFAILED:
case END_STREAM_REASON_TIMEOUT:
case END_STREAM_REASON_MISC:
......
......@@ -192,7 +192,7 @@ get_scheduler_type_string(scheduler_types_t type)
case SCHEDULER_KIST_LITE:
return "KISTLite";
case SCHEDULER_NONE:
/* fallthrough */
FALLTHROUGH;
default:
tor_assert_unreached();
return "(N/A)";
......@@ -288,7 +288,7 @@ select_scheduler(void)
scheduler_kist_set_lite_mode();
goto end;
case SCHEDULER_NONE:
/* fallthrough */
FALLTHROUGH;
default:
/* Our option validation should have caught this. */
tor_assert_unreached();
......
......@@ -293,7 +293,7 @@ send_circuit_level_sendme(circuit_t *circ, crypt_path_t *layer_hint,
log_debug(LD_PROTOCOL, "Emitting SENDME version 1 cell.");
break;
case 0x00:
/* Fallthrough because default is to use v0. */
FALLTHROUGH;
default:
/* Unknown version, fallback to version 0 meaning no payload. */
payload_len = 0;
......
......@@ -856,7 +856,7 @@ fetch_from_buf_socks(buf_t *buf, socks_request_t *req,
case SOCKS_RESULT_TRUNCATED:
if (datalen == n_pullup)
return 0;
/* FALLTHRU */
FALLTHROUGH;
case SOCKS_RESULT_MORE_EXPECTED:
res = 0;
break;
......@@ -962,7 +962,7 @@ parse_socks(const char *data, size_t datalen, socks_request_t *req,
strlcpy((char*)req->reply, SOCKS_PROXY_IS_NOT_AN_HTTP_PROXY_MSG,
MAX_SOCKS_REPLY_LEN);
req->replylen = strlen((char*)req->reply)+1;
/* fall through */
FALLTHROUGH;
default: /* version is not socks4 or socks5 */
log_warn(LD_APP,
"Socks version %d not recognized. (This port is not an "
......
......@@ -95,13 +95,13 @@ uint64_t siphash24(const void *src, unsigned long src_sz, const struct sipkey *k
}
#else
switch (src_sz - blocks) {
case 7: last7 |= (uint64_t)m[i + 6] << 48; /* Falls through. */
case 6: last7 |= (uint64_t)m[i + 5] << 40; /* Falls through. */
case 5: last7 |= (uint64_t)m[i + 4] << 32; /* Falls through. */
case 4: last7 |= (uint64_t)m[i + 3] << 24; /* Falls through. */
case 3: last7 |= (uint64_t)m[i + 2] << 16; /* Falls through. */
case 2: last7 |= (uint64_t)m[i + 1] << 8; /* Falls through. */
case 1: last7 |= (uint64_t)m[i + 0] ; /* Falls through. */
case 7: last7 |= (uint64_t)m[i + 6] << 48; FALLTHROUGH;
case 6: last7 |= (uint64_t)m[i + 5] << 40; FALLTHROUGH;
case 5: last7 |= (uint64_t)m[i + 4] << 32; FALLTHROUGH;
case 4: last7 |= (uint64_t)m[i + 3] << 24; FALLTHROUGH;
case 3: last7 |= (uint64_t)m[i + 2] << 16; FALLTHROUGH;
case 2: last7 |= (uint64_t)m[i + 1] << 8; FALLTHROUGH;
case 1: last7 |= (uint64_t)m[i + 0] ; FALLTHROUGH;
case 0:
default:;
}
......
......@@ -385,14 +385,14 @@ sub256_modm_batch(bignum256modm out, const bignum256modm a, const bignum256modm
size_t i = 0;
bignum256modm_element_t carry = 0;
switch (limbsize) {
case 8: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; /* Falls through. */
case 7: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; /* Falls through. */
case 6: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; /* Falls through. */
case 5: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; /* Falls through. */
case 4: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; /* Falls through. */
case 3: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; /* Falls through. */
case 2: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; /* Falls through. */
case 1: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; /* Falls through. */
case 8: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; FALLTHROUGH;
case 7: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; FALLTHROUGH;
case 6: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; FALLTHROUGH;
case 5: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; FALLTHROUGH;
case 4: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; FALLTHROUGH;
case 3: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; FALLTHROUGH;
case 2: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; FALLTHROUGH;
case 1: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; FALLTHROUGH;
case 0:
default: out[i] = (a[i] - b[i]) - carry;
}
......@@ -403,14 +403,14 @@ sub256_modm_batch(bignum256modm out, const bignum256modm a, const bignum256modm
static int
lt256_modm_batch(const bignum256modm a, const bignum256modm b, size_t limbsize) {
switch (limbsize) {
case 8: if (a[8] > b[8]) return 0; if (a[8] < b[8]) return 1; /* Falls through. */
case 7: if (a[7] > b[7]) return 0; if (a[7] < b[7]) return 1; /* Falls through. */
case 6: if (a[6] > b[6]) return 0; if (a[6] < b[6]) return 1; /* Falls through. */
case 5: if (a[5] > b[5]) return 0; if (a[5] < b[5]) return 1; /* Falls through. */
case 4: if (a[4] > b[4]) return 0; if (a[4] < b[4]) return 1; /* Falls through. */
case 3: if (a[3] > b[3]) return 0; if (a[3] < b[3]) return 1; /* Falls through. */
case 2: if (a[2] > b[2]) return 0; if (a[2] < b[2]) return 1; /* Falls through. */
case 1: if (a[1] > b[1]) return 0; if (a[1] < b[1]) return 1; /* Falls through. */
case 8: if (a[8] > b[8]) return 0; if (a[8] < b[8]) return 1; FALLTHROUGH;
case 7: if (a[7] > b[7]) return 0; if (a[7] < b[7]) return 1; FALLTHROUGH;
case 6: if (a[6] > b[6]) return 0; if (a[6] < b[6]) return 1; FALLTHROUGH;
case 5: if (a[5] > b[5]) return 0; if (a[5] < b[5]) return 1; FALLTHROUGH;
case 4: if (a[4] > b[4]) return 0; if (a[4] < b[4]) return 1; FALLTHROUGH;
case 3: if (a[3] > b[3]) return 0; if (a[3] < b[3]) return 1; FALLTHROUGH;
case 2: if (a[2] > b[2]) return 0; if (a[2] < b[2]) return 1; FALLTHROUGH;
case 1: if (a[1] > b[1]) return 0; if (a[1] < b[1]) return 1; FALLTHROUGH;
case 0: if (a[0] > b[0]) return 0; if (a[0] < b[0]) return 1;
}
return 0;
......@@ -420,14 +420,14 @@ lt256_modm_batch(const bignum256modm a, const bignum256modm b, size_t limbsize)
static int
lte256_modm_batch(const bignum256modm a, const bignum256modm b, size_t limbsize) {
switch (limbsize) {
case 8: if (a[8] > b[8]) return 0; if (a[8] < b[8]) return 1; /* Falls through. */
case 7: if (a[7] > b[7]) return 0; if (a[7] < b[7]) return 1; /* Falls through. */
case 6: if (a[6] > b[6]) return 0; if (a[6] < b[6]) return 1; /* Falls through. */
case 5: if (a[5] > b[5]) return 0; if (a[5] < b[5]) return 1; /* Falls through. */
case 4: if (a[4] > b[4]) return 0; if (a[4] < b[4]) return 1; /* Falls through. */
case 3: if (a[3] > b[3]) return 0; if (a[3] < b[3]) return 1; /* Falls through. */
case 2: if (a[2] > b[2]) return 0; if (a[2] < b[2]) return 1; /* Falls through. */
case 1: if (a[1] > b[1]) return 0; if (a[1] < b[1]) return 1; /* Falls through. */
case 8: if (a[8] > b[8]) return 0; if (a[8] < b[8]) return 1; FALLTHROUGH;
case 7: if (a[7] > b[7]) return 0; if (a[7] < b[7]) return 1; FALLTHROUGH;
case 6: if (a[6] > b[6]) return 0; if (a[6] < b[6]) return 1; FALLTHROUGH;
case 5: if (a[5] > b[5]) return 0; if (a[5] < b[5]) return 1; FALLTHROUGH;
case 4: if (a[4] > b[4]) return 0; if (a[4] < b[4]) return 1; FALLTHROUGH;
case 3: if (a[3] > b[3]) return 0; if (a[3] < b[3]) return 1; FALLTHROUGH;
case 2: if (a[2] > b[2]) return 0; if (a[2] < b[2]) return 1; FALLTHROUGH;
case 1: if (a[1] > b[1]) return 0; if (a[1] < b[1]) return 1; FALLTHROUGH;
case 0: if (a[0] > b[0]) return 0; if (a[0] < b[0]) return 1;
}
return 1;
......
......@@ -294,10 +294,10 @@ sub256_modm_batch(bignum256modm out, const bignum256modm a, const bignum256modm
size_t i = 0;
bignum256modm_element_t carry = 0;
switch (limbsize) {
case 4: out[i] = (a[i] - b[i]) ; carry = (out[i] >> 63); out[i] &= 0xffffffffffffff; i++; /* Falls through. */
case 3: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 63); out[i] &= 0xffffffffffffff; i++; /* Falls through. */
case 2: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 63); out[i] &= 0xffffffffffffff; i++; /* Falls through. */
case 1: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 63); out[i] &= 0xffffffffffffff; i++; /* Falls through. */
case 4: out[i] = (a[i] - b[i]) ; carry = (out[i] >> 63); out[i] &= 0xffffffffffffff; i++; FALLTHROUGH;
case 3: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 63); out[i] &= 0xffffffffffffff; i++; FALLTHROUGH;
case 2: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 63); out[i] &= 0xffffffffffffff; i++; FALLTHROUGH;
case 1: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 63); out[i] &= 0xffffffffffffff; i++; FALLTHROUGH;
case 0:
default: out[i] = (a[i] - b[i]) - carry;
}
......@@ -310,10 +310,10 @@ lt256_modm_batch(const bignum256modm a, const bignum256modm b, size_t limbsize)
size_t i = 0;
bignum256modm_element_t t, carry = 0;
switch (limbsize) {
case 4: t = (a[i] - b[i]) ; carry = (t >> 63); i++; /* Falls through. */
case 3: t = (a[i] - b[i]) - carry; carry = (t >> 63); i++; /* Falls through. */
case 2: t = (a[i] - b[i]) - carry; carry = (t >> 63); i++; /* Falls through. */
case 1: t = (a[i] - b[i]) - carry; carry = (t >> 63); i++; /* Falls through. */
case 4: t = (a[i] - b[i]) ; carry = (t >> 63); i++; FALLTHROUGH;
case 3: t = (a[i] - b[i]) - carry; carry = (t >> 63); i++; FALLTHROUGH;
case 2: t = (a[i] - b[i]) - carry; carry = (t >> 63); i++; FALLTHROUGH;
case 1: t = (a[i] - b[i]) - carry; carry = (t >> 63); i++; FALLTHROUGH;
case 0: t = (a[i] - b[i]) - carry; carry = (t >> 63);
}
return (int)carry;
......@@ -325,10 +325,10 @@ lte256_modm_batch(const bignum256modm a, const bignum256modm b, size_t limbsize)
size_t i = 0;
bignum256modm_element_t t, carry = 0;
switch (limbsize) {
case 4: t = (b[i] - a[i]) ; carry = (t >> 63); i++; /* Falls through. */
case 3: t = (b[i] - a[i]) - carry; carry = (t >> 63); i++; /* Falls through. */
case 2: t = (b[i] - a[i]) - carry; carry = (t >> 63); i++; /* Falls through. */
case 1: t = (b[i] - a[i]) - carry; carry = (t >> 63); i++; /* Falls through. */
case 4: t = (b[i] - a[i]) ; carry = (t >> 63); i++; FALLTHROUGH;
case 3: t = (b[i] - a[i]) - carry; carry = (t >> 63); i++; FALLTHROUGH;
case 2: t = (b[i] - a[i]) - carry; carry = (t >> 63); i++; FALLTHROUGH;
case 1: t = (b[i] - a[i]) - carry; carry = (t >> 63); i++; FALLTHROUGH;
case 0: t = (b[i] - a[i]) - carry; carry = (t >> 63);
}
return (int)!carry;
......
......@@ -2263,7 +2263,7 @@ entry_guards_note_guard_success(guard_selection_t *gs,
break;
default:
tor_assert_nonfatal_unreached();
/* Fall through. */
FALLTHROUGH;
case GUARD_CIRC_STATE_USABLE_IF_NO_BETTER_GUARD:
if (guard->is_primary) {
/* XXXX #20832 -- I don't actually like this logic. It seems to make
......
......@@ -1887,7 +1887,7 @@ handle_control_add_onion(control_connection_t *conn,
case RSAE_BADAUTH:
control_write_endreply(conn, 512, "Invalid client authorization");
break;
case RSAE_INTERNAL: /* FALLSTHROUGH */
case RSAE_INTERNAL: FALLTHROUGH;
default:
control_write_endreply(conn, 551, "Failed to add Onion Service");
}
......
......@@ -1369,7 +1369,7 @@ directory_initiate_request,(directory_request_t *request))
case 1:
/* start flushing conn */
conn->base_.state = DIR_CONN_STATE_CLIENT_SENDING;
/* fall through */
FALLTHROUGH;
case 0:
/* queue the command on the outbuf */
directory_send_command(conn, 1, request);
......
......@@ -222,7 +222,7 @@ token_check_object(memarea_t *area, const char *kwd,
kwd, crypto_pk_num_bits(tok->key));
RET_ERR(ebuf);
}
/* fall through */
FALLTHROUGH;
case NEED_KEY: /* There must be some kind of key. */
if (!tok->key) {
tor_snprintf(ebuf, sizeof(ebuf), "Missing public key for %s", kwd);
......
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